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gerrit-public.fairphone.software / platform / system / bt / 803d72fae59fd8e55463c3dc2466bf7f6de99904 / . / stack / btm / btm_sec.cc
blob: 935903d36261975db9166f57c68ce9495884e2dc [file] [log] [blame]
/******************************************************************************
*
* Copyright 1999-2012 Broadcom Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
/******************************************************************************
*
* This file contains functions for the Bluetooth Security Manager
*
******************************************************************************/
#define LOG_TAG "bt_btm_sec"
#include <frameworks/base/core/proto/android/bluetooth/enums.pb.h>
#include <frameworks/base/core/proto/android/bluetooth/hci/enums.pb.h>
#include <log/log.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include "common/metrics.h"
#include "common/time_util.h"
#include "device/include/controller.h"
#include "osi/include/log.h"
#include "osi/include/osi.h"
#include "bt_types.h"
#include "bt_utils.h"
#include "btif_storage.h"
#include "btm_int.h"
#include "btu.h"
#include "hcimsgs.h"
#include "l2c_int.h"
#include "gatt_int.h"
#define BTM_SEC_MAX_COLLISION_DELAY (5000)
#ifdef APPL_AUTH_WRITE_EXCEPTION
bool(APPL_AUTH_WRITE_EXCEPTION)(const RawAddress& bd_addr);
#endif
extern void btm_ble_advertiser_notify_terminated_legacy(
uint8_t status, uint16_t connection_handle);
extern void bta_dm_remove_device(const RawAddress& bd_addr);
/*******************************************************************************
* L O C A L F U N C T I O N P R O T O T Y P E S *
******************************************************************************/
tBTM_SEC_SERV_REC* btm_sec_find_first_serv(bool is_originator, uint16_t psm);
static tBTM_SEC_SERV_REC* btm_sec_find_next_serv(tBTM_SEC_SERV_REC* p_cur);
static tBTM_SEC_SERV_REC* btm_sec_find_mx_serv(uint8_t is_originator,
uint16_t psm,
uint32_t mx_proto_id,
uint32_t mx_chan_id);
static bool btm_sec_start_get_name(tBTM_SEC_DEV_REC* p_dev_rec);
static void btm_sec_start_authentication(tBTM_SEC_DEV_REC* p_dev_rec);
static void btm_sec_start_encryption(tBTM_SEC_DEV_REC* p_dev_rec);
static void btm_sec_collision_timeout(void* data);
static void btm_restore_mode(void);
static void btm_sec_pairing_timeout(void* data);
static tBTM_STATUS btm_sec_dd_create_conn(tBTM_SEC_DEV_REC* p_dev_rec);
static void btm_sec_change_pairing_state(tBTM_PAIRING_STATE new_state);
static const char* btm_pair_state_descr(tBTM_PAIRING_STATE state);
static void btm_sec_check_pending_reqs(void);
static bool btm_sec_queue_mx_request(const RawAddress& bd_addr, uint16_t psm,
bool is_orig, uint32_t mx_proto_id,
uint32_t mx_chan_id,
tBTM_SEC_CALLBACK* p_callback,
void* p_ref_data);
static void btm_sec_bond_cancel_complete(void);
static void btm_send_link_key_notif(tBTM_SEC_DEV_REC* p_dev_rec);
static bool btm_sec_check_prefetch_pin(tBTM_SEC_DEV_REC* p_dev_rec);
static uint8_t btm_sec_start_authorization(tBTM_SEC_DEV_REC* p_dev_rec);
bool btm_sec_are_all_trusted(uint32_t p_mask[]);
static tBTM_STATUS btm_sec_send_hci_disconnect(tBTM_SEC_DEV_REC* p_dev_rec,
uint8_t reason,
uint16_t conn_handle);
uint8_t btm_sec_start_role_switch(tBTM_SEC_DEV_REC* p_dev_rec);
tBTM_SEC_DEV_REC* btm_sec_find_dev_by_sec_state(uint8_t state);
static bool btm_sec_set_security_level(CONNECTION_TYPE conn_type,
const char* p_name, uint8_t service_id,
uint16_t sec_level, uint16_t psm,
uint32_t mx_proto_id,
uint32_t mx_chan_id);
static bool btm_dev_authenticated(tBTM_SEC_DEV_REC* p_dev_rec);
static bool btm_dev_encrypted(tBTM_SEC_DEV_REC* p_dev_rec);
static bool btm_dev_authorized(tBTM_SEC_DEV_REC* p_dev_rec);
static bool btm_serv_trusted(tBTM_SEC_DEV_REC* p_dev_rec,
tBTM_SEC_SERV_REC* p_serv_rec);
static bool btm_sec_is_serv_level0(uint16_t psm);
static uint16_t btm_sec_set_serv_level4_flags(uint16_t cur_security,
bool is_originator);
static bool btm_sec_queue_encrypt_request(const RawAddress& bd_addr,
tBT_TRANSPORT transport,
tBTM_SEC_CALLBACK* p_callback,
void* p_ref_data,
tBTM_BLE_SEC_ACT sec_act);
static void btm_sec_check_pending_enc_req(tBTM_SEC_DEV_REC* p_dev_rec,
tBT_TRANSPORT transport,
uint8_t encr_enable);
static bool btm_sec_use_smp_br_chnl(tBTM_SEC_DEV_REC* p_dev_rec);
static bool btm_sec_is_master(tBTM_SEC_DEV_REC* p_dev_rec);
/* true - authenticated link key is possible */
static const bool btm_sec_io_map[BTM_IO_CAP_MAX][BTM_IO_CAP_MAX] = {
/* OUT, IO, IN, NONE */
/* OUT */ {false, false, true, false},
/* IO */ {false, true, true, false},
/* IN */ {true, true, true, false},
/* NONE */ {false, false, false, false}};
/* BTM_IO_CAP_OUT 0 DisplayOnly */
/* BTM_IO_CAP_IO 1 DisplayYesNo */
/* BTM_IO_CAP_IN 2 KeyboardOnly */
/* BTM_IO_CAP_NONE 3 NoInputNoOutput */
/*******************************************************************************
*
* Function btm_dev_authenticated
*
* Description check device is authenticated
*
* Returns bool true or false
*
******************************************************************************/
static bool btm_dev_authenticated(tBTM_SEC_DEV_REC* p_dev_rec) {
if (p_dev_rec->sec_flags & BTM_SEC_AUTHENTICATED) {
return (true);
}
return (false);
}
/*******************************************************************************
*
* Function btm_dev_encrypted
*
* Description check device is encrypted
*
* Returns bool true or false
*
******************************************************************************/
static bool btm_dev_encrypted(tBTM_SEC_DEV_REC* p_dev_rec) {
if (p_dev_rec->sec_flags & BTM_SEC_ENCRYPTED) {
return (true);
}
return (false);
}
/*******************************************************************************
*
* Function btm_dev_authorized
*
* Description check device is authorized
*
* Returns bool true or false
*
******************************************************************************/
static bool btm_dev_authorized(tBTM_SEC_DEV_REC* p_dev_rec) {
if (p_dev_rec->sec_flags & BTM_SEC_AUTHORIZED) {
return (true);
}
return (false);
}
/*******************************************************************************
*
* Function btm_dev_16_digit_authenticated
*
* Description check device is authenticated by using 16 digit pin or MITM
*
* Returns bool true or false
*
******************************************************************************/
static bool btm_dev_16_digit_authenticated(tBTM_SEC_DEV_REC* p_dev_rec) {
// BTM_SEC_16_DIGIT_PIN_AUTHED is set if MITM or 16 digit pin is used
if (p_dev_rec->sec_flags & BTM_SEC_16_DIGIT_PIN_AUTHED) {
return (true);
}
return (false);
}
/*******************************************************************************
*
* Function btm_serv_trusted
*
* Description check service is trusted
*
* Returns bool true or false
*
******************************************************************************/
static bool btm_serv_trusted(tBTM_SEC_DEV_REC* p_dev_rec,
tBTM_SEC_SERV_REC* p_serv_rec) {
if (BTM_SEC_IS_SERVICE_TRUSTED(p_dev_rec->trusted_mask,
p_serv_rec->service_id)) {
return (true);
}
return (false);
}
/*******************************************************************************
*
* Function BTM_SecRegister
*
* Description Application manager calls this function to register for
* security services. There can be one and only one
* application saving link keys. BTM allows only first
* registration.
*
* Returns true if registered OK, else false
*
******************************************************************************/
bool BTM_SecRegister(const tBTM_APPL_INFO* p_cb_info) {
BTM_TRACE_EVENT("%s application registered", __func__);
LOG_INFO(LOG_TAG, "%s p_cb_info->p_le_callback == 0x%p", __func__,
p_cb_info->p_le_callback);
if (p_cb_info->p_le_callback) {
BTM_TRACE_EVENT("%s SMP_Register( btm_proc_smp_cback )", __func__);
SMP_Register(btm_proc_smp_cback);
Octet16 zero{0};
/* if no IR is loaded, need to regenerate all the keys */
if (btm_cb.devcb.id_keys.ir == zero) {
btm_ble_reset_id();
}
} else {
LOG_WARN(LOG_TAG, "%s p_cb_info->p_le_callback == NULL", __func__);
}
btm_cb.api = *p_cb_info;
LOG_INFO(LOG_TAG, "%s btm_cb.api.p_le_callback = 0x%p ", __func__,
btm_cb.api.p_le_callback);
BTM_TRACE_EVENT("%s application registered", __func__);
return (true);
}
/*******************************************************************************
*
* Function BTM_SecRegisterLinkKeyNotificationCallback
*
* Description Application manager calls this function to register for
* link key notification. When there is nobody registered
* we should avoid changing link key
*
* Returns true if registered OK, else false
*
******************************************************************************/
bool BTM_SecRegisterLinkKeyNotificationCallback(
tBTM_LINK_KEY_CALLBACK* p_callback) {
btm_cb.api.p_link_key_callback = p_callback;
return true;
}
/*******************************************************************************
*
* Function BTM_SecAddRmtNameNotifyCallback
*
* Description Any profile can register to be notified when name of the
* remote device is resolved.
*
* Returns true if registered OK, else false
*
******************************************************************************/
bool BTM_SecAddRmtNameNotifyCallback(tBTM_RMT_NAME_CALLBACK* p_callback) {
int i;
for (i = 0; i < BTM_SEC_MAX_RMT_NAME_CALLBACKS; i++) {
if (btm_cb.p_rmt_name_callback[i] == NULL) {
btm_cb.p_rmt_name_callback[i] = p_callback;
return (true);
}
}
return (false);
}
/*******************************************************************************
*
* Function BTM_SecDeleteRmtNameNotifyCallback
*
* Description Any profile can deregister notification when a new Link Key
* is generated per connection.
*
* Returns true if OK, else false
*
******************************************************************************/
bool BTM_SecDeleteRmtNameNotifyCallback(tBTM_RMT_NAME_CALLBACK* p_callback) {
int i;
for (i = 0; i < BTM_SEC_MAX_RMT_NAME_CALLBACKS; i++) {
if (btm_cb.p_rmt_name_callback[i] == p_callback) {
btm_cb.p_rmt_name_callback[i] = NULL;
return (true);
}
}
return (false);
}
/*******************************************************************************
*
* Function BTM_GetSecurityFlags
*
* Description Get security flags for the device
*
* Returns bool true or false is device found
*
******************************************************************************/
bool BTM_GetSecurityFlags(const RawAddress& bd_addr, uint8_t* p_sec_flags) {
tBTM_SEC_DEV_REC* p_dev_rec;
p_dev_rec = btm_find_dev(bd_addr);
if (p_dev_rec != NULL) {
*p_sec_flags = (uint8_t)p_dev_rec->sec_flags;
return (true);
}
BTM_TRACE_ERROR("BTM_GetSecurityFlags false");
return (false);
}
/*******************************************************************************
*
* Function BTM_GetSecurityFlagsByTransport
*
* Description Get security flags for the device on a particular transport
*
* Returns bool true or false is device found
*
******************************************************************************/
bool BTM_GetSecurityFlagsByTransport(const RawAddress& bd_addr,
uint8_t* p_sec_flags,
tBT_TRANSPORT transport) {
tBTM_SEC_DEV_REC* p_dev_rec;
p_dev_rec = btm_find_dev(bd_addr);
if (p_dev_rec != NULL) {
if (transport == BT_TRANSPORT_BR_EDR)
*p_sec_flags = (uint8_t)p_dev_rec->sec_flags;
else
*p_sec_flags = (uint8_t)(p_dev_rec->sec_flags >> 8);
return (true);
}
BTM_TRACE_ERROR("BTM_GetSecurityFlags false");
return (false);
}
/*******************************************************************************
*
* Function BTM_SetPinType
*
* Description Set PIN type for the device.
*
* Returns void
*
******************************************************************************/
void BTM_SetPinType(uint8_t pin_type, PIN_CODE pin_code, uint8_t pin_code_len) {
BTM_TRACE_API(
"BTM_SetPinType: pin type %d [variable-0, fixed-1], code %s, length %d",
pin_type, (char*)pin_code, pin_code_len);
/* If device is not up security mode will be set as a part of startup */
if ((btm_cb.cfg.pin_type != pin_type) &&
controller_get_interface()->get_is_ready()) {
btsnd_hcic_write_pin_type(pin_type);
}
btm_cb.cfg.pin_type = pin_type;
btm_cb.cfg.pin_code_len = pin_code_len;
memcpy(btm_cb.cfg.pin_code, pin_code, pin_code_len);
}
/*******************************************************************************
*
* Function BTM_SetPairableMode
*
* Description Enable or disable pairing
*
* Parameters allow_pairing - (true or false) whether or not the device
* allows pairing.
* connect_only_paired - (true or false) whether or not to
* only allow paired devices to connect.
*
* Returns void
*
******************************************************************************/
void BTM_SetPairableMode(bool allow_pairing, bool connect_only_paired) {
BTM_TRACE_API(
"BTM_SetPairableMode() allow_pairing: %u connect_only_paired: %u",
allow_pairing, connect_only_paired);
btm_cb.pairing_disabled = !allow_pairing;
btm_cb.connect_only_paired = connect_only_paired;
}
/*******************************************************************************
*
* Function BTM_SetSecureConnectionsOnly
*
* Description Enable or disable default treatment for Mode 4 Level 0
* services
*
* Parameter secure_connections_only_mode -
* true means that the device should treat Mode 4 Level 0
* services as services of other levels.
* false means that the device should provide default
* treatment for Mode 4 Level 0 services.
*
* Returns void
*
******************************************************************************/
void BTM_SetSecureConnectionsOnly(bool secure_connections_only_mode) {
BTM_TRACE_API("%s: Mode : %u", __func__, secure_connections_only_mode);
btm_cb.devcb.secure_connections_only = secure_connections_only_mode;
btm_cb.security_mode = BTM_SEC_MODE_SC;
}
#define BTM_NO_AVAIL_SEC_SERVICES ((uint16_t)0xffff)
/*******************************************************************************
*
* Function BTM_SetSecurityLevel
*
* Description Register service security level with Security Manager
*
* Parameters: is_originator - true if originating the connection
* p_name - Name of the service relevant only if
* authorization will show this name to user.
* Ignored if BTM_SEC_SERVICE_NAME_LEN is 0.
* service_id - service ID for the service passed to
* authorization callback
* sec_level - bit mask of the security features
* psm - L2CAP PSM
* mx_proto_id - protocol ID of multiplexing proto below
* mx_chan_id - channel ID of multiplexing proto below
*
* Returns true if registered OK, else false
*
******************************************************************************/
bool BTM_SetSecurityLevel(bool is_originator, const char* p_name,
uint8_t service_id, uint16_t sec_level, uint16_t psm,
uint32_t mx_proto_id, uint32_t mx_chan_id) {
return (btm_sec_set_security_level(is_originator, p_name, service_id,
sec_level, psm, mx_proto_id, mx_chan_id));
}
/*******************************************************************************
*
* Function btm_sec_set_security_level
*
* Description Register service security level with Security Manager
*
* Parameters: conn_type - true if originating the connection
* p_name - Name of the service relevant only if
* authorization will show this name to user.
* Ignored if BTM_SEC_SERVICE_NAME_LEN is 0.
* service_id - service ID for the service passed to
* authorization callback
* sec_level - bit mask of the security features
* psm - L2CAP PSM
* mx_proto_id - protocol ID of multiplexing proto below
* mx_chan_id - channel ID of multiplexing proto below
*
* Returns true if registered OK, else false
*
******************************************************************************/
static bool btm_sec_set_security_level(CONNECTION_TYPE conn_type,
const char* p_name, uint8_t service_id,
uint16_t sec_level, uint16_t psm,
uint32_t mx_proto_id,
uint32_t mx_chan_id) {
tBTM_SEC_SERV_REC* p_srec;
uint16_t index;
uint16_t first_unused_record = BTM_NO_AVAIL_SEC_SERVICES;
bool record_allocated = false;
bool is_originator;
is_originator = conn_type;
BTM_TRACE_API("%s : sec: 0x%x", __func__, sec_level);
/* See if the record can be reused (same service name, psm, mx_proto_id,
service_id, and mx_chan_id), or obtain the next unused record */
p_srec = &btm_cb.sec_serv_rec[0];
for (index = 0; index < BTM_SEC_MAX_SERVICE_RECORDS; index++, p_srec++) {
/* Check if there is already a record for this service */
if (p_srec->security_flags & BTM_SEC_IN_USE) {
#if BTM_SEC_SERVICE_NAME_LEN > 0
if (p_srec->psm == psm && p_srec->mx_proto_id == mx_proto_id &&
service_id == p_srec->service_id && p_name &&
(!strncmp(p_name, (char*)p_srec->orig_service_name,
/* strlcpy replaces end char with termination char*/
BTM_SEC_SERVICE_NAME_LEN - 1) ||
!strncmp(p_name, (char*)p_srec->term_service_name,
/* strlcpy replaces end char with termination char*/
BTM_SEC_SERVICE_NAME_LEN - 1)))
#else
if (p_srec->psm == psm && p_srec->mx_proto_id == mx_proto_id &&
service_id == p_srec->service_id)
#endif
{
record_allocated = true;
break;
}
}
/* Mark the first available service record */
else if (!record_allocated) {
memset(p_srec, 0, sizeof(tBTM_SEC_SERV_REC));
record_allocated = true;
first_unused_record = index;
}
}
if (!record_allocated) {
BTM_TRACE_WARNING("BTM_SEC_REG: Out of Service Records (%d)",
BTM_SEC_MAX_SERVICE_RECORDS);
return (record_allocated);
}
/* Process the request if service record is valid */
/* If a duplicate service wasn't found, use the first available */
if (index >= BTM_SEC_MAX_SERVICE_RECORDS) {
index = first_unused_record;
p_srec = &btm_cb.sec_serv_rec[index];
}
p_srec->psm = psm;
p_srec->service_id = service_id;
p_srec->mx_proto_id = mx_proto_id;
if (is_originator) {
p_srec->orig_mx_chan_id = mx_chan_id;
#if BTM_SEC_SERVICE_NAME_LEN > 0
strlcpy((char*)p_srec->orig_service_name, p_name,
BTM_SEC_SERVICE_NAME_LEN + 1);
#endif
/* clear out the old setting, just in case it exists */
{
p_srec->security_flags &= ~(
BTM_SEC_OUT_AUTHORIZE | BTM_SEC_OUT_ENCRYPT |
BTM_SEC_OUT_AUTHENTICATE | BTM_SEC_OUT_MITM | BTM_SEC_FORCE_MASTER |
BTM_SEC_ATTEMPT_MASTER | BTM_SEC_FORCE_SLAVE | BTM_SEC_ATTEMPT_SLAVE);
}
/* Parameter validation. Originator should not set requirements for
* incoming connections */
sec_level &=
~(BTM_SEC_IN_AUTHORIZE | BTM_SEC_IN_ENCRYPT | BTM_SEC_IN_AUTHENTICATE |
BTM_SEC_IN_MITM | BTM_SEC_IN_MIN_16_DIGIT_PIN);
if (btm_cb.security_mode == BTM_SEC_MODE_SP ||
btm_cb.security_mode == BTM_SEC_MODE_SP_DEBUG ||
btm_cb.security_mode == BTM_SEC_MODE_SC) {
if (sec_level & BTM_SEC_OUT_AUTHENTICATE) sec_level |= BTM_SEC_OUT_MITM;
}
/* Make sure the authenticate bit is set, when encrypt bit is set */
if (sec_level & BTM_SEC_OUT_ENCRYPT) sec_level |= BTM_SEC_OUT_AUTHENTICATE;
/* outgoing connections usually set the security level right before
* the connection is initiated.
* set it to be the outgoing service */
btm_cb.p_out_serv = p_srec;
} else {
p_srec->term_mx_chan_id = mx_chan_id;
#if BTM_SEC_SERVICE_NAME_LEN > 0
strlcpy((char*)p_srec->term_service_name, p_name,
BTM_SEC_SERVICE_NAME_LEN + 1);
#endif
/* clear out the old setting, just in case it exists */
{
p_srec->security_flags &=
~(BTM_SEC_IN_AUTHORIZE | BTM_SEC_IN_ENCRYPT |
BTM_SEC_IN_AUTHENTICATE | BTM_SEC_IN_MITM | BTM_SEC_FORCE_MASTER |
BTM_SEC_ATTEMPT_MASTER | BTM_SEC_FORCE_SLAVE |
BTM_SEC_ATTEMPT_SLAVE | BTM_SEC_IN_MIN_16_DIGIT_PIN);
}
/* Parameter validation. Acceptor should not set requirements for outgoing
* connections */
sec_level &= ~(BTM_SEC_OUT_AUTHORIZE | BTM_SEC_OUT_ENCRYPT |
BTM_SEC_OUT_AUTHENTICATE | BTM_SEC_OUT_MITM);
if (btm_cb.security_mode == BTM_SEC_MODE_SP ||
btm_cb.security_mode == BTM_SEC_MODE_SP_DEBUG ||
btm_cb.security_mode == BTM_SEC_MODE_SC) {
if (sec_level & BTM_SEC_IN_AUTHENTICATE) sec_level |= BTM_SEC_IN_MITM;
}
/* Make sure the authenticate bit is set, when encrypt bit is set */
if (sec_level & BTM_SEC_IN_ENCRYPT) sec_level |= BTM_SEC_IN_AUTHENTICATE;
}
p_srec->security_flags |= (uint16_t)(sec_level | BTM_SEC_IN_USE);
BTM_TRACE_API(
"BTM_SEC_REG[%d]: id %d, is_orig %d, psm 0x%04x, proto_id %d, chan_id %d",
index, service_id, is_originator, psm, mx_proto_id, mx_chan_id);
#if BTM_SEC_SERVICE_NAME_LEN > 0
BTM_TRACE_API(
" : sec: 0x%x, service name [%s] (up to %d chars saved)",
p_srec->security_flags, p_name, BTM_SEC_SERVICE_NAME_LEN);
#endif
return (record_allocated);
}
/*******************************************************************************
*
* Function BTM_SecClrService
*
* Description Removes specified service record(s) from the security
* database. All service records with the specified name are
* removed. Typically used only by devices with limited RAM so
* that it can reuse an old security service record.
*
* Note: Unpredictable results may occur if a service is
* cleared that is still in use by an application/profile.
*
* Parameters Service ID - Id of the service to remove. '0' removes all
* service records (except SDP).
*
* Returns Number of records that were freed.
*
******************************************************************************/
uint8_t BTM_SecClrService(uint8_t service_id) {
tBTM_SEC_SERV_REC* p_srec = &btm_cb.sec_serv_rec[0];
uint8_t num_freed = 0;
int i;
for (i = 0; i < BTM_SEC_MAX_SERVICE_RECORDS; i++, p_srec++) {
/* Delete services with specified name (if in use and not SDP) */
if ((p_srec->security_flags & BTM_SEC_IN_USE) &&
(p_srec->psm != BT_PSM_SDP) &&
(!service_id || (service_id == p_srec->service_id))) {
BTM_TRACE_API("BTM_SEC_CLR[%d]: id %d", i, service_id);
p_srec->security_flags = 0;
num_freed++;
}
}
return (num_freed);
}
/*******************************************************************************
*
* Function btm_sec_clr_service_by_psm
*
* Description Removes specified service record from the security database.
* All service records with the specified psm are removed.
* Typically used by L2CAP to free up the service record used
* by dynamic PSM clients when the channel is closed.
* The given psm must be a virtual psm.
*
* Parameters Service ID - Id of the service to remove. '0' removes all
* service records (except SDP).
*
* Returns Number of records that were freed.
*
******************************************************************************/
uint8_t btm_sec_clr_service_by_psm(uint16_t psm) {
tBTM_SEC_SERV_REC* p_srec = &btm_cb.sec_serv_rec[0];
uint8_t num_freed = 0;
int i;
for (i = 0; i < BTM_SEC_MAX_SERVICE_RECORDS; i++, p_srec++) {
/* Delete services with specified name (if in use and not SDP) */
if ((p_srec->security_flags & BTM_SEC_IN_USE) && (p_srec->psm == psm)) {
BTM_TRACE_API("BTM_SEC_CLR[%d]: id %d ", i, p_srec->service_id);
p_srec->security_flags = 0;
num_freed++;
}
}
BTM_TRACE_API("btm_sec_clr_service_by_psm psm:0x%x num_freed:%d", psm,
num_freed);
return (num_freed);
}
/*******************************************************************************
*
* Function btm_sec_clr_temp_auth_service
*
* Description Removes specified device record's temporary authorization
* flag from the security database.
*
* Parameters Device address to be cleared
*
* Returns void.
*
******************************************************************************/
void btm_sec_clr_temp_auth_service(const RawAddress& bda) {
tBTM_SEC_DEV_REC* p_dev_rec;
p_dev_rec = btm_find_dev(bda);
if (p_dev_rec == NULL) {
BTM_TRACE_WARNING("btm_sec_clr_temp_auth_service() - no dev CB");
return;
}
/* Reset the temporary authorized flag so that next time (untrusted) service
* is accessed autorization will take place */
if (p_dev_rec->last_author_service_id != BTM_SEC_NO_LAST_SERVICE_ID &&
p_dev_rec->p_cur_service) {
VLOG(1) << __func__ << " clearing device: " << bda;
p_dev_rec->last_author_service_id = BTM_SEC_NO_LAST_SERVICE_ID;
}
}
/*******************************************************************************
*
* Function BTM_PINCodeReply
*
* Description This function is called after Security Manager submitted
* PIN code request to the UI.
*
* Parameters: bd_addr - Address of the device for which PIN was
* requested
* res - result of the operation BTM_SUCCESS
* if success
* pin_len - length in bytes of the PIN Code
* p_pin - pointer to array with the PIN Code
* trusted_mask - bitwise OR of trusted services
* (array of uint32_t)
*
******************************************************************************/
void BTM_PINCodeReply(const RawAddress& bd_addr, uint8_t res, uint8_t pin_len,
uint8_t* p_pin, uint32_t trusted_mask[]) {
tBTM_SEC_DEV_REC* p_dev_rec;
BTM_TRACE_API(
"BTM_PINCodeReply(): PairState: %s PairFlags: 0x%02x PinLen:%d "
"Result:%d",
btm_pair_state_descr(btm_cb.pairing_state), btm_cb.pairing_flags, pin_len,
res);
/* If timeout already expired or has been canceled, ignore the reply */
if (btm_cb.pairing_state != BTM_PAIR_STATE_WAIT_LOCAL_PIN) {
BTM_TRACE_WARNING("BTM_PINCodeReply() - Wrong State: %d",
btm_cb.pairing_state);
return;
}
if (bd_addr != btm_cb.pairing_bda) {
BTM_TRACE_ERROR("BTM_PINCodeReply() - Wrong BD Addr");
return;
}
p_dev_rec = btm_find_dev(bd_addr);
if (p_dev_rec == NULL) {
BTM_TRACE_ERROR("BTM_PINCodeReply() - no dev CB");
return;
}
if ((pin_len > PIN_CODE_LEN) || (pin_len == 0) || (p_pin == NULL))
res = BTM_ILLEGAL_VALUE;
if (res != BTM_SUCCESS) {
/* if peer started dd OR we started dd and pre-fetch pin was not used send
* negative reply */
if ((btm_cb.pairing_flags & BTM_PAIR_FLAGS_PEER_STARTED_DD) ||
((btm_cb.pairing_flags & BTM_PAIR_FLAGS_WE_STARTED_DD) &&
(btm_cb.pairing_flags & BTM_PAIR_FLAGS_DISC_WHEN_DONE))) {
/* use BTM_PAIR_STATE_WAIT_AUTH_COMPLETE to report authentication failed
* event */
btm_sec_change_pairing_state(BTM_PAIR_STATE_WAIT_AUTH_COMPLETE);
btm_cb.acl_disc_reason = HCI_ERR_HOST_REJECT_SECURITY;
btsnd_hcic_pin_code_neg_reply(bd_addr);
} else {
p_dev_rec->security_required = BTM_SEC_NONE;
btm_sec_change_pairing_state(BTM_PAIR_STATE_IDLE);
}
return;
}
if (trusted_mask)
BTM_SEC_COPY_TRUSTED_DEVICE(trusted_mask, p_dev_rec->trusted_mask);
p_dev_rec->sec_flags |= BTM_SEC_LINK_KEY_AUTHED;
p_dev_rec->pin_code_length = pin_len;
if (pin_len >= 16) {
p_dev_rec->sec_flags |= BTM_SEC_16_DIGIT_PIN_AUTHED;
}
if ((btm_cb.pairing_flags & BTM_PAIR_FLAGS_WE_STARTED_DD) &&
(p_dev_rec->hci_handle == BTM_SEC_INVALID_HANDLE) &&
(!btm_cb.security_mode_changed)) {
/* This is start of the dedicated bonding if local device is 2.0 */
btm_cb.pin_code_len = pin_len;
memcpy(btm_cb.pin_code, p_pin, pin_len);
btm_cb.security_mode_changed = true;
#ifdef APPL_AUTH_WRITE_EXCEPTION
if (!(APPL_AUTH_WRITE_EXCEPTION)(p_dev_rec->bd_addr))
#endif
btsnd_hcic_write_auth_enable(true);
btm_cb.acl_disc_reason = 0xff;
/* if we rejected incoming connection request, we have to wait
* HCI_Connection_Complete event */
/* before originating */
if (btm_cb.pairing_flags & BTM_PAIR_FLAGS_REJECTED_CONNECT) {
BTM_TRACE_WARNING(
"BTM_PINCodeReply(): waiting HCI_Connection_Complete after rejected "
"incoming connection");
/* we change state little bit early so btm_sec_connected() will originate
* connection */
/* when existing ACL link is down completely */
btm_sec_change_pairing_state(BTM_PAIR_STATE_WAIT_PIN_REQ);
}
/* if we already accepted incoming connection from pairing device */
else if (p_dev_rec->sm4 & BTM_SM4_CONN_PEND) {
BTM_TRACE_WARNING(
"BTM_PINCodeReply(): link is connecting so wait pin code request "
"from peer");
btm_sec_change_pairing_state(BTM_PAIR_STATE_WAIT_PIN_REQ);
} else if (btm_sec_dd_create_conn(p_dev_rec) != BTM_CMD_STARTED) {
btm_sec_change_pairing_state(BTM_PAIR_STATE_IDLE);
p_dev_rec->sec_flags &= ~BTM_SEC_LINK_KEY_AUTHED;
if (btm_cb.api.p_auth_complete_callback)
(*btm_cb.api.p_auth_complete_callback)(
p_dev_rec->bd_addr, p_dev_rec->dev_class, p_dev_rec->sec_bd_name,
HCI_ERR_AUTH_FAILURE);
}
return;
}
btm_sec_change_pairing_state(BTM_PAIR_STATE_WAIT_AUTH_COMPLETE);
btm_cb.acl_disc_reason = HCI_SUCCESS;
btsnd_hcic_pin_code_req_reply(bd_addr, pin_len, p_pin);
}
/*******************************************************************************
*
* Function btm_sec_bond_by_transport
*
* Description this is the bond function that will start either SSP or SMP.
*
* Parameters: bd_addr - Address of the device to bond
* pin_len - length in bytes of the PIN Code
* p_pin - pointer to array with the PIN Code
* trusted_mask - bitwise OR of trusted services
* (array of uint32_t)
*
* Note: After 2.1 parameters are not used and preserved here not to change API
******************************************************************************/
tBTM_STATUS btm_sec_bond_by_transport(const RawAddress& bd_addr,
tBT_TRANSPORT transport, uint8_t pin_len,
uint8_t* p_pin, uint32_t trusted_mask[]) {
tBTM_SEC_DEV_REC* p_dev_rec;
tBTM_STATUS status;
uint8_t* p_features;
uint8_t ii;
tACL_CONN* p = btm_bda_to_acl(bd_addr, transport);
VLOG(1) << __func__ << " BDA: " << bd_addr;
BTM_TRACE_DEBUG("%s: Transport used %d, bd_addr=%s", __func__, transport,
bd_addr.ToString().c_str());
/* Other security process is in progress */
if (btm_cb.pairing_state != BTM_PAIR_STATE_IDLE) {
BTM_TRACE_ERROR("BTM_SecBond: already busy in state: %s",
btm_pair_state_descr(btm_cb.pairing_state));
return (BTM_WRONG_MODE);
}
p_dev_rec = btm_find_or_alloc_dev(bd_addr);
if (p_dev_rec == NULL) {
return (BTM_NO_RESOURCES);
}
if (!controller_get_interface()->get_is_ready()) {
BTM_TRACE_ERROR("%s controller module is not ready", __func__);
return (BTM_NO_RESOURCES);
}
BTM_TRACE_DEBUG("before update sec_flags=0x%x", p_dev_rec->sec_flags);
/* Finished if connection is active and already paired */
if (((p_dev_rec->hci_handle != BTM_SEC_INVALID_HANDLE) &&
transport == BT_TRANSPORT_BR_EDR &&
(p_dev_rec->sec_flags & BTM_SEC_AUTHENTICATED)) ||
((p_dev_rec->ble_hci_handle != BTM_SEC_INVALID_HANDLE) &&
transport == BT_TRANSPORT_LE &&
(p_dev_rec->sec_flags & BTM_SEC_LE_AUTHENTICATED))) {
BTM_TRACE_WARNING("BTM_SecBond -> Already Paired");
return (BTM_SUCCESS);
}
/* Tell controller to get rid of the link key if it has one stored */
if ((BTM_DeleteStoredLinkKey(&bd_addr, NULL)) != BTM_SUCCESS)
return (BTM_NO_RESOURCES);
/* Save the PIN code if we got a valid one */
if (p_pin && (pin_len <= PIN_CODE_LEN) && (pin_len != 0)) {
btm_cb.pin_code_len = pin_len;
p_dev_rec->pin_code_length = pin_len;
memcpy(btm_cb.pin_code, p_pin, PIN_CODE_LEN);
}
btm_cb.pairing_bda = bd_addr;
btm_cb.pairing_flags = BTM_PAIR_FLAGS_WE_STARTED_DD;
p_dev_rec->security_required = BTM_SEC_OUT_AUTHENTICATE;
p_dev_rec->is_originator = true;
if (trusted_mask)
BTM_SEC_COPY_TRUSTED_DEVICE(trusted_mask, p_dev_rec->trusted_mask);
if (transport == BT_TRANSPORT_LE) {
btm_ble_init_pseudo_addr(p_dev_rec, bd_addr);
p_dev_rec->sec_flags &= ~BTM_SEC_LE_MASK;
if (SMP_Pair(bd_addr) == SMP_STARTED) {
btm_cb.pairing_flags |= BTM_PAIR_FLAGS_LE_ACTIVE;
p_dev_rec->sec_state = BTM_SEC_STATE_AUTHENTICATING;
btm_sec_change_pairing_state(BTM_PAIR_STATE_WAIT_AUTH_COMPLETE);
return BTM_CMD_STARTED;
}
btm_cb.pairing_flags = 0;
return (BTM_NO_RESOURCES);
}
p_dev_rec->sec_flags &=
~(BTM_SEC_LINK_KEY_KNOWN | BTM_SEC_AUTHENTICATED | BTM_SEC_ENCRYPTED |
BTM_SEC_ROLE_SWITCHED | BTM_SEC_LINK_KEY_AUTHED);
BTM_TRACE_DEBUG("after update sec_flags=0x%x", p_dev_rec->sec_flags);
if (!controller_get_interface()->supports_simple_pairing()) {
/* The special case when we authenticate keyboard. Set pin type to fixed */
/* It would be probably better to do it from the application, but it is */
/* complicated */
if (((p_dev_rec->dev_class[1] & BTM_COD_MAJOR_CLASS_MASK) ==
BTM_COD_MAJOR_PERIPHERAL) &&
(p_dev_rec->dev_class[2] & BTM_COD_MINOR_KEYBOARD) &&
(btm_cb.cfg.pin_type != HCI_PIN_TYPE_FIXED)) {
btm_cb.pin_type_changed = true;
btsnd_hcic_write_pin_type(HCI_PIN_TYPE_FIXED);
}
}
for (ii = 0; ii <= HCI_EXT_FEATURES_PAGE_MAX; ii++) {
p_features = p_dev_rec->feature_pages[ii];
BTM_TRACE_EVENT(" remote_features page[%1d] = %02x-%02x-%02x-%02x", ii,
p_features[0], p_features[1], p_features[2], p_features[3]);
BTM_TRACE_EVENT(" %02x-%02x-%02x-%02x",
p_features[4], p_features[5], p_features[6], p_features[7]);
}
BTM_TRACE_EVENT("BTM_SecBond: Remote sm4: 0x%x HCI Handle: 0x%04x",
p_dev_rec->sm4, p_dev_rec->hci_handle);
#if (BTM_SEC_FORCE_RNR_FOR_DBOND == TRUE)
p_dev_rec->sec_flags &= ~BTM_SEC_NAME_KNOWN;
#endif
/* If connection already exists... */
if (p && p->hci_handle != BTM_SEC_INVALID_HANDLE) {
btm_sec_start_authentication(p_dev_rec);
btm_sec_change_pairing_state(BTM_PAIR_STATE_WAIT_PIN_REQ);
/* Mark lcb as bonding */
l2cu_update_lcb_4_bonding(bd_addr, true);
return (BTM_CMD_STARTED);
}
BTM_TRACE_DEBUG("sec mode: %d sm4:x%x", btm_cb.security_mode, p_dev_rec->sm4);
if (!controller_get_interface()->supports_simple_pairing() ||
(p_dev_rec->sm4 == BTM_SM4_KNOWN)) {
if (btm_sec_check_prefetch_pin(p_dev_rec)) return (BTM_CMD_STARTED);
}
if ((btm_cb.security_mode == BTM_SEC_MODE_SP ||
btm_cb.security_mode == BTM_SEC_MODE_SP_DEBUG ||
btm_cb.security_mode == BTM_SEC_MODE_SC) &&
BTM_SEC_IS_SM4_UNKNOWN(p_dev_rec->sm4)) {
/* local is 2.1 and peer is unknown */
if ((p_dev_rec->sm4 & BTM_SM4_CONN_PEND) == 0) {
/* we are not accepting connection request from peer
* -> RNR (to learn if peer is 2.1)
* RNR when no ACL causes HCI_RMT_HOST_SUP_FEAT_NOTIFY_EVT */
btm_sec_change_pairing_state(BTM_PAIR_STATE_GET_REM_NAME);
status = BTM_ReadRemoteDeviceName(bd_addr, NULL, BT_TRANSPORT_BR_EDR);
} else {
/* We are accepting connection request from peer */
btm_sec_change_pairing_state(BTM_PAIR_STATE_WAIT_PIN_REQ);
status = BTM_CMD_STARTED;
}
BTM_TRACE_DEBUG("State:%s sm4: 0x%x sec_state:%d",
btm_pair_state_descr(btm_cb.pairing_state), p_dev_rec->sm4,
p_dev_rec->sec_state);
} else {
/* both local and peer are 2.1 */
status = btm_sec_dd_create_conn(p_dev_rec);
}
if (status != BTM_CMD_STARTED) {
BTM_TRACE_ERROR(
"%s BTM_ReadRemoteDeviceName or btm_sec_dd_create_conn error: 0x%x",
__func__, (int)status);
btm_sec_change_pairing_state(BTM_PAIR_STATE_IDLE);
}
return status;
}
/*******************************************************************************
*
* Function BTM_SecBondByTransport
*
* Description This function is called to perform bonding with peer device.
* If the connection is already up, but not secure, pairing
* is attempted. If already paired BTM_SUCCESS is returned.
*
* Parameters: bd_addr - Address of the device to bond
* transport - doing SSP over BR/EDR or SMP over LE
* pin_len - length in bytes of the PIN Code
* p_pin - pointer to array with the PIN Code
* trusted_mask - bitwise OR of trusted services
* (array of uint32_t)
*
* Note: After 2.1 parameters are not used and preserved here not to change API
******************************************************************************/
tBTM_STATUS BTM_SecBondByTransport(const RawAddress& bd_addr,
tBT_TRANSPORT transport, uint8_t pin_len,
uint8_t* p_pin, uint32_t trusted_mask[]) {
tBT_DEVICE_TYPE dev_type;
tBLE_ADDR_TYPE addr_type;
BTM_ReadDevInfo(bd_addr, &dev_type, &addr_type);
/* LE device, do SMP pairing */
if ((transport == BT_TRANSPORT_LE && (dev_type & BT_DEVICE_TYPE_BLE) == 0) ||
(transport == BT_TRANSPORT_BR_EDR &&
(dev_type & BT_DEVICE_TYPE_BREDR) == 0)) {
return BTM_ILLEGAL_ACTION;
}
return btm_sec_bond_by_transport(bd_addr, transport, pin_len, p_pin,
trusted_mask);
}
/*******************************************************************************
*
* Function BTM_SecBond
*
* Description This function is called to perform bonding with peer device.
* If the connection is already up, but not secure, pairing
* is attempted. If already paired BTM_SUCCESS is returned.
*
* Parameters: bd_addr - Address of the device to bond
* pin_len - length in bytes of the PIN Code
* p_pin - pointer to array with the PIN Code
* trusted_mask - bitwise OR of trusted services
* (array of uint32_t)
*
* Note: After 2.1 parameters are not used and preserved here not to change API
******************************************************************************/
tBTM_STATUS BTM_SecBond(const RawAddress& bd_addr, uint8_t pin_len,
uint8_t* p_pin, uint32_t trusted_mask[]) {
tBT_TRANSPORT transport = BT_TRANSPORT_BR_EDR;
if (BTM_UseLeLink(bd_addr)) transport = BT_TRANSPORT_LE;
return btm_sec_bond_by_transport(bd_addr, transport, pin_len, p_pin,
trusted_mask);
}
/*******************************************************************************
*
* Function BTM_SecBondCancel
*
* Description This function is called to cancel ongoing bonding process
* with peer device.
*
* Parameters: bd_addr - Address of the peer device
* transport - false for BR/EDR link; true for LE link
*
******************************************************************************/
tBTM_STATUS BTM_SecBondCancel(const RawAddress& bd_addr) {
tBTM_SEC_DEV_REC* p_dev_rec;
BTM_TRACE_API("BTM_SecBondCancel() State: %s flags:0x%x",
btm_pair_state_descr(btm_cb.pairing_state),
btm_cb.pairing_flags);
p_dev_rec = btm_find_dev(bd_addr);
if (!p_dev_rec || btm_cb.pairing_bda != bd_addr) {
return BTM_UNKNOWN_ADDR;
}
if (btm_cb.pairing_flags & BTM_PAIR_FLAGS_LE_ACTIVE) {
if (p_dev_rec->sec_state == BTM_SEC_STATE_AUTHENTICATING) {
BTM_TRACE_DEBUG("Cancel LE pairing");
if (SMP_PairCancel(bd_addr)) {
return BTM_CMD_STARTED;
}
}
return BTM_WRONG_MODE;
}
BTM_TRACE_DEBUG("hci_handle:0x%x sec_state:%d", p_dev_rec->hci_handle,
p_dev_rec->sec_state);
if (BTM_PAIR_STATE_WAIT_LOCAL_PIN == btm_cb.pairing_state &&
BTM_PAIR_FLAGS_WE_STARTED_DD & btm_cb.pairing_flags) {
/* pre-fetching pin for dedicated bonding */
btm_sec_bond_cancel_complete();
return BTM_SUCCESS;
}
/* If this BDA is in a bonding procedure */
if ((btm_cb.pairing_state != BTM_PAIR_STATE_IDLE) &&
(btm_cb.pairing_flags & BTM_PAIR_FLAGS_WE_STARTED_DD)) {
/* If the HCI link is up */
if (p_dev_rec->hci_handle != BTM_SEC_INVALID_HANDLE) {
/* If some other thread disconnecting, we do not send second command */
if ((p_dev_rec->sec_state == BTM_SEC_STATE_DISCONNECTING) ||
(p_dev_rec->sec_state == BTM_SEC_STATE_DISCONNECTING_BOTH))
return (BTM_CMD_STARTED);
/* If the HCI link was set up by Bonding process */
if (btm_cb.pairing_flags & BTM_PAIR_FLAGS_DISC_WHEN_DONE)
return btm_sec_send_hci_disconnect(p_dev_rec, HCI_ERR_PEER_USER,
p_dev_rec->hci_handle);
else
l2cu_update_lcb_4_bonding(bd_addr, false);
return BTM_NOT_AUTHORIZED;
} else /*HCI link is not up */
{
/* If the HCI link creation was started by Bonding process */
if (btm_cb.pairing_flags & BTM_PAIR_FLAGS_DISC_WHEN_DONE) {
btsnd_hcic_create_conn_cancel(bd_addr);
return BTM_CMD_STARTED;
}
if (btm_cb.pairing_state == BTM_PAIR_STATE_GET_REM_NAME) {
BTM_CancelRemoteDeviceName();
btm_cb.pairing_flags |= BTM_PAIR_FLAGS_WE_CANCEL_DD;
return BTM_CMD_STARTED;
}
return BTM_NOT_AUTHORIZED;
}
}
return BTM_WRONG_MODE;
}
/*******************************************************************************
*
* Function BTM_SecGetDeviceLinkKey
*
* Description This function is called to obtain link key for the device
* it returns BTM_SUCCESS if link key is available, or
* BTM_UNKNOWN_ADDR if Security Manager does not know about
* the device or device record does not contain link key info
*
* Parameters: bd_addr - Address of the device
* link_key - Link Key is copied into this pointer
*
******************************************************************************/
tBTM_STATUS BTM_SecGetDeviceLinkKey(const RawAddress& bd_addr,
LinkKey* link_key) {
tBTM_SEC_DEV_REC* p_dev_rec;
p_dev_rec = btm_find_dev(bd_addr);
if ((p_dev_rec != NULL) && (p_dev_rec->sec_flags & BTM_SEC_LINK_KEY_KNOWN)) {
*link_key = p_dev_rec->link_key;
return (BTM_SUCCESS);
}
return (BTM_UNKNOWN_ADDR);
}
/*******************************************************************************
*
* Function BTM_SecGetDeviceLinkKeyType
*
* Description This function is called to obtain link key type for the
* device.
* it returns BTM_SUCCESS if link key is available, or
* BTM_UNKNOWN_ADDR if Security Manager does not know about
* the device or device record does not contain link key info
*
* Returns BTM_LKEY_TYPE_IGNORE if link key is unknown, link type
* otherwise.
*
******************************************************************************/
tBTM_LINK_KEY_TYPE BTM_SecGetDeviceLinkKeyType(const RawAddress& bd_addr) {
tBTM_SEC_DEV_REC* p_dev_rec = btm_find_dev(bd_addr);
if ((p_dev_rec != NULL) && (p_dev_rec->sec_flags & BTM_SEC_LINK_KEY_KNOWN)) {
return p_dev_rec->link_key_type;
}
return BTM_LKEY_TYPE_IGNORE;
}
/*******************************************************************************
*
* Function BTM_SetEncryption
*
* Description This function is called to ensure that connection is
* encrypted. Should be called only on an open connection.
* Typically only needed for connections that first want to
* bring up unencrypted links, then later encrypt them.
*
* Parameters: bd_addr - Address of the peer device
* transport - Link transport
* p_callback - Pointer to callback function called if
* this function returns PENDING after required
* procedures are completed. Can be set to
* NULL if status is not desired.
* p_ref_data - pointer to any data the caller wishes to
* receive in the callback function upon
* completion. can be set to NULL if not used.
* sec_act - LE security action, unused for BR/EDR
*
* Returns BTM_SUCCESS - already encrypted
* BTM_PENDING - command will be returned in the callback
* BTM_WRONG_MODE- connection not up.
* BTM_BUSY - security procedures are currently active
* BTM_MODE_UNSUPPORTED - if security manager not linked in.
*
******************************************************************************/
tBTM_STATUS BTM_SetEncryption(const RawAddress& bd_addr,
tBT_TRANSPORT transport,
tBTM_SEC_CBACK* p_callback, void* p_ref_data,
tBTM_BLE_SEC_ACT sec_act) {
tBTM_STATUS rc = 0;
tBTM_SEC_DEV_REC* p_dev_rec = btm_find_dev(bd_addr);
if (!p_dev_rec ||
(transport == BT_TRANSPORT_BR_EDR &&
p_dev_rec->hci_handle == BTM_SEC_INVALID_HANDLE) ||
(transport == BT_TRANSPORT_LE &&
p_dev_rec->ble_hci_handle == BTM_SEC_INVALID_HANDLE)) {
/* Connection should be up and runnning */
BTM_TRACE_WARNING("Security Manager: BTM_SetEncryption not connected");
if (p_callback)
(*p_callback)(&bd_addr, transport, p_ref_data, BTM_WRONG_MODE);
return (BTM_WRONG_MODE);
}
if (transport == BT_TRANSPORT_BR_EDR &&
(p_dev_rec->sec_flags & BTM_SEC_ENCRYPTED)) {
BTM_TRACE_EVENT("Security Manager: BTM_SetEncryption already encrypted");
if (*p_callback)
(*p_callback)(&bd_addr, transport, p_ref_data, BTM_SUCCESS);
return (BTM_SUCCESS);
}
/* enqueue security request if security is active */
if (p_dev_rec->p_callback || (p_dev_rec->sec_state != BTM_SEC_STATE_IDLE)) {
BTM_TRACE_WARNING(
"Security Manager: BTM_SetEncryption busy, enqueue request");
if (btm_sec_queue_encrypt_request(bd_addr, transport, p_callback,
p_ref_data, sec_act)) {
return BTM_CMD_STARTED;
} else {
if (p_callback)
(*p_callback)(&bd_addr, transport, p_ref_data, BTM_NO_RESOURCES);
return BTM_NO_RESOURCES;
}
}
p_dev_rec->p_callback = p_callback;
p_dev_rec->p_ref_data = p_ref_data;
p_dev_rec->security_required |=
(BTM_SEC_IN_AUTHENTICATE | BTM_SEC_IN_ENCRYPT);
p_dev_rec->is_originator = false;
BTM_TRACE_API(
"Security Manager: BTM_SetEncryption Handle:%d State:%d Flags:0x%x "
"Required:0x%x, p_dev_rec=%p, p_callback=%p",
p_dev_rec->hci_handle, p_dev_rec->sec_state, p_dev_rec->sec_flags,
p_dev_rec->security_required, p_dev_rec, p_callback);
if (transport == BT_TRANSPORT_LE) {
tACL_CONN* p = btm_bda_to_acl(bd_addr, transport);
if (p) {
rc = btm_ble_set_encryption(bd_addr, sec_act, p->link_role);
} else {
rc = BTM_WRONG_MODE;
BTM_TRACE_WARNING("%s: cannot call btm_ble_set_encryption, p is NULL",
__func__);
}
} else {
rc = btm_sec_execute_procedure(p_dev_rec);
}
if (rc != BTM_CMD_STARTED && rc != BTM_BUSY) {
if (p_callback) {
BTM_TRACE_DEBUG(
"%s: clearing p_callback=%p, p_dev_rec=%p, transport=%d, "
"bd_addr=%s",
__func__, p_callback, p_dev_rec, transport,
bd_addr.ToString().c_str());
p_dev_rec->p_callback = NULL;
(*p_callback)(&bd_addr, transport, p_dev_rec->p_ref_data, rc);
}
}
return (rc);
}
/*******************************************************************************
* disconnect the ACL link, if it's not done yet.
******************************************************************************/
static tBTM_STATUS btm_sec_send_hci_disconnect(tBTM_SEC_DEV_REC* p_dev_rec,
uint8_t reason,
uint16_t conn_handle) {
uint8_t old_state = p_dev_rec->sec_state;
tBTM_STATUS status = BTM_CMD_STARTED;
BTM_TRACE_EVENT("btm_sec_send_hci_disconnect: handle:0x%x, reason=0x%x",
conn_handle, reason);
/* send HCI_Disconnect on a transport only once */
switch (old_state) {
case BTM_SEC_STATE_DISCONNECTING:
if (conn_handle == p_dev_rec->hci_handle) return status;
p_dev_rec->sec_state = BTM_SEC_STATE_DISCONNECTING_BOTH;
break;
case BTM_SEC_STATE_DISCONNECTING_BLE:
if (conn_handle == p_dev_rec->ble_hci_handle) return status;
p_dev_rec->sec_state = BTM_SEC_STATE_DISCONNECTING_BOTH;
break;
case BTM_SEC_STATE_DISCONNECTING_BOTH:
return status;
default:
p_dev_rec->sec_state = (conn_handle == p_dev_rec->hci_handle)
? BTM_SEC_STATE_DISCONNECTING
: BTM_SEC_STATE_DISCONNECTING_BLE;
break;
}
/* If a role switch is in progress, delay the HCI Disconnect to avoid
* controller problem */
if (p_dev_rec->rs_disc_pending == BTM_SEC_RS_PENDING &&
p_dev_rec->hci_handle == conn_handle) {
BTM_TRACE_DEBUG(
"RS in progress - Set DISC Pending flag in btm_sec_send_hci_disconnect "
"to delay disconnect");
p_dev_rec->rs_disc_pending = BTM_SEC_DISC_PENDING;
status = BTM_SUCCESS;
}
/* Tear down the HCI link */
else {
btsnd_hcic_disconnect(conn_handle, reason);
}
return status;
}
/*******************************************************************************
*
* Function BTM_ConfirmReqReply
*
* Description This function is called to confirm the numeric value for
* Simple Pairing in response to BTM_SP_CFM_REQ_EVT
*
* Parameters: res - result of the operation BTM_SUCCESS if
* success
* bd_addr - Address of the peer device
*
******************************************************************************/
void BTM_ConfirmReqReply(tBTM_STATUS res, const RawAddress& bd_addr) {
tBTM_SEC_DEV_REC* p_dev_rec;
BTM_TRACE_EVENT("BTM_ConfirmReqReply() State: %s Res: %u",
btm_pair_state_descr(btm_cb.pairing_state), res);
/* If timeout already expired or has been canceled, ignore the reply */
if ((btm_cb.pairing_state != BTM_PAIR_STATE_WAIT_NUMERIC_CONFIRM) ||
(btm_cb.pairing_bda != bd_addr))
return;
btm_sec_change_pairing_state(BTM_PAIR_STATE_WAIT_AUTH_COMPLETE);
if ((res == BTM_SUCCESS) || (res == BTM_SUCCESS_NO_SECURITY)) {
btm_cb.acl_disc_reason = HCI_SUCCESS;
if (res == BTM_SUCCESS) {
p_dev_rec = btm_find_dev(bd_addr);
if (p_dev_rec != NULL) {
p_dev_rec->sec_flags |= BTM_SEC_LINK_KEY_AUTHED;
p_dev_rec->sec_flags |= BTM_SEC_16_DIGIT_PIN_AUTHED;
}
}
btsnd_hcic_user_conf_reply(bd_addr, true);
} else {
/* Report authentication failed event from state
* BTM_PAIR_STATE_WAIT_AUTH_COMPLETE */
btm_cb.acl_disc_reason = HCI_ERR_HOST_REJECT_SECURITY;
btsnd_hcic_user_conf_reply(bd_addr, false);
}
}
/*******************************************************************************
*
* Function BTM_PasskeyReqReply
*
* Description This function is called to provide the passkey for
* Simple Pairing in response to BTM_SP_KEY_REQ_EVT
*
* Parameters: res - result of the operation BTM_SUCCESS if success
* bd_addr - Address of the peer device
* passkey - numeric value in the range of
* BTM_MIN_PASSKEY_VAL(0) -
* BTM_MAX_PASSKEY_VAL(999999(0xF423F)).
*
******************************************************************************/
void BTM_PasskeyReqReply(tBTM_STATUS res, const RawAddress& bd_addr,
uint32_t passkey) {
BTM_TRACE_API("BTM_PasskeyReqReply: State: %s res:%d",
btm_pair_state_descr(btm_cb.pairing_state), res);
if ((btm_cb.pairing_state == BTM_PAIR_STATE_IDLE) ||
(btm_cb.pairing_bda != bd_addr)) {
return;
}
/* If timeout already expired or has been canceled, ignore the reply */
if ((btm_cb.pairing_state == BTM_PAIR_STATE_WAIT_AUTH_COMPLETE) &&
(res != BTM_SUCCESS)) {
tBTM_SEC_DEV_REC* p_dev_rec = btm_find_dev(bd_addr);
if (p_dev_rec != NULL) {
btm_cb.acl_disc_reason = HCI_ERR_HOST_REJECT_SECURITY;
if (p_dev_rec->hci_handle != BTM_SEC_INVALID_HANDLE)
btm_sec_send_hci_disconnect(p_dev_rec, HCI_ERR_AUTH_FAILURE,
p_dev_rec->hci_handle);
else
BTM_SecBondCancel(bd_addr);
p_dev_rec->sec_flags &=
~(BTM_SEC_LINK_KEY_AUTHED | BTM_SEC_LINK_KEY_KNOWN);
btm_sec_change_pairing_state(BTM_PAIR_STATE_IDLE);
return;
}
} else if (btm_cb.pairing_state != BTM_PAIR_STATE_KEY_ENTRY)
return;
if (passkey > BTM_MAX_PASSKEY_VAL) res = BTM_ILLEGAL_VALUE;
btm_sec_change_pairing_state(BTM_PAIR_STATE_WAIT_AUTH_COMPLETE);
if (res != BTM_SUCCESS) {
/* use BTM_PAIR_STATE_WAIT_AUTH_COMPLETE to report authentication failed
* event */
btm_cb.acl_disc_reason = HCI_ERR_HOST_REJECT_SECURITY;
btsnd_hcic_user_passkey_neg_reply(bd_addr);
} else {
btm_cb.acl_disc_reason = HCI_SUCCESS;
btsnd_hcic_user_passkey_reply(bd_addr, passkey);
}
}
/*******************************************************************************
*
* Function BTM_SendKeypressNotif
*
* Description This function is used during the passkey entry model
* by a device with KeyboardOnly IO capabilities
* (very likely to be a HID Device).
* It is called by a HID Device to inform the remote device
* when a key has been entered or erased.
*
* Parameters: bd_addr - Address of the peer device
* type - notification type
*
******************************************************************************/
void BTM_SendKeypressNotif(const RawAddress& bd_addr, tBTM_SP_KEY_TYPE type) {
/* This API only make sense between PASSKEY_REQ and SP complete */
if (btm_cb.pairing_state == BTM_PAIR_STATE_KEY_ENTRY)
btsnd_hcic_send_keypress_notif(bd_addr, type);
}
/*******************************************************************************
*
* Function BTM_IoCapRsp
*
* Description This function is called in response to BTM_SP_IO_REQ_EVT
* When the event data io_req.oob_data is set to
* BTM_OOB_UNKNOWN by the tBTM_SP_CALLBACK implementation,
* this function is called to provide the actual response
*
* Parameters: bd_addr - Address of the peer device
* io_cap - The IO capability of local device.
* oob - BTM_OOB_NONE or BTM_OOB_PRESENT.
* auth_req- MITM protection required or not.
*
******************************************************************************/
void BTM_IoCapRsp(const RawAddress& bd_addr, tBTM_IO_CAP io_cap,
tBTM_OOB_DATA oob, tBTM_AUTH_REQ auth_req) {
BTM_TRACE_EVENT("BTM_IoCapRsp: state: %s oob: %d io_cap: %d",
btm_pair_state_descr(btm_cb.pairing_state), oob, io_cap);
if ((btm_cb.pairing_state != BTM_PAIR_STATE_WAIT_LOCAL_IOCAPS) ||
(btm_cb.pairing_bda != bd_addr))
return;
if (oob < BTM_OOB_UNKNOWN && io_cap < BTM_IO_CAP_MAX) {
btm_cb.devcb.loc_auth_req = auth_req;
btm_cb.devcb.loc_io_caps = io_cap;
if (btm_cb.pairing_flags & BTM_PAIR_FLAGS_WE_STARTED_DD)
auth_req = (BTM_AUTH_DD_BOND | (auth_req & BTM_AUTH_YN_BIT));
btsnd_hcic_io_cap_req_reply(bd_addr, io_cap, oob, auth_req);
}
}
/*******************************************************************************
*
* Function BTM_ReadLocalOobData
*
* Description This function is called to read the local OOB data from
* LM
*
******************************************************************************/
void BTM_ReadLocalOobData(void) { btsnd_hcic_read_local_oob_data(); }
/*******************************************************************************
*
* Function BTM_RemoteOobDataReply
*
* Description This function is called to provide the remote OOB data for
* Simple Pairing in response to BTM_SP_RMT_OOB_EVT
*
* Parameters: bd_addr - Address of the peer device
* c - simple pairing Hash C.
* r - simple pairing Randomizer C.
*
******************************************************************************/
void BTM_RemoteOobDataReply(tBTM_STATUS res, const RawAddress& bd_addr,
const Octet16& c, const Octet16& r) {
BTM_TRACE_EVENT("%s() - State: %s res: %d", __func__,
btm_pair_state_descr(btm_cb.pairing_state), res);
/* If timeout already expired or has been canceled, ignore the reply */
if (btm_cb.pairing_state != BTM_PAIR_STATE_WAIT_LOCAL_OOB_RSP) return;
btm_sec_change_pairing_state(BTM_PAIR_STATE_WAIT_AUTH_COMPLETE);
if (res != BTM_SUCCESS) {
/* use BTM_PAIR_STATE_WAIT_AUTH_COMPLETE to report authentication failed
* event */
btm_cb.acl_disc_reason = HCI_ERR_HOST_REJECT_SECURITY;
btsnd_hcic_rem_oob_neg_reply(bd_addr);
} else {
btm_cb.acl_disc_reason = HCI_SUCCESS;
btsnd_hcic_rem_oob_reply(bd_addr, c, r);
}
}
/*******************************************************************************
*
* Function BTM_BuildOobData
*
* Description This function is called to build the OOB data payload to
* be sent over OOB (non-Bluetooth) link
*
* Parameters: p_data - the location for OOB data
* max_len - p_data size.
* c - simple pairing Hash C.
* r - simple pairing Randomizer C.
* name_len- 0, local device name would not be included.
* otherwise, the local device name is included for
* up to this specified length
*
* Returns Number of bytes in p_data.
*
******************************************************************************/
uint16_t BTM_BuildOobData(uint8_t* p_data, uint16_t max_len, const Octet16& c,
const Octet16& r, uint8_t name_len) {
uint8_t* p = p_data;
uint16_t len = 0;
uint16_t name_size;
uint8_t name_type = BTM_EIR_SHORTENED_LOCAL_NAME_TYPE;
if (p_data && max_len >= BTM_OOB_MANDATORY_SIZE) {
/* add mandatory part */
UINT16_TO_STREAM(p, len);
BDADDR_TO_STREAM(p, *controller_get_interface()->get_address());
len = BTM_OOB_MANDATORY_SIZE;
max_len -= len;
/* now optional part */
/* add Hash C */
uint16_t delta = BTM_OOB_HASH_C_SIZE + 2;
if (max_len >= delta) {
*p++ = BTM_OOB_HASH_C_SIZE + 1;
*p++ = BTM_EIR_OOB_SSP_HASH_C_TYPE;
ARRAY_TO_STREAM(p, c.data(), BTM_OOB_HASH_C_SIZE);
len += delta;
max_len -= delta;
}
/* add Rand R */
delta = BTM_OOB_RAND_R_SIZE + 2;
if (max_len >= delta) {
*p++ = BTM_OOB_RAND_R_SIZE + 1;
*p++ = BTM_EIR_OOB_SSP_RAND_R_TYPE;
ARRAY_TO_STREAM(p, r.data(), BTM_OOB_RAND_R_SIZE);
len += delta;
max_len -= delta;
}
/* add class of device */
delta = BTM_OOB_COD_SIZE + 2;
if (max_len >= delta) {
*p++ = BTM_OOB_COD_SIZE + 1;
*p++ = BTM_EIR_OOB_COD_TYPE;
DEVCLASS_TO_STREAM(p, btm_cb.devcb.dev_class);
len += delta;
max_len -= delta;
}
name_size = name_len;
if (name_size > strlen(btm_cb.cfg.bd_name)) {
name_type = BTM_EIR_COMPLETE_LOCAL_NAME_TYPE;
name_size = (uint16_t)strlen(btm_cb.cfg.bd_name);
}
delta = name_size + 2;
if (max_len >= delta) {
*p++ = name_size + 1;
*p++ = name_type;
ARRAY_TO_STREAM(p, btm_cb.cfg.bd_name, name_size);
len += delta;
max_len -= delta;
}
/* update len */
p = p_data;
UINT16_TO_STREAM(p, len);
}
return len;
}
/*******************************************************************************
*
* Function BTM_BothEndsSupportSecureConnections
*
* Description This function is called to check if both the local device
* and the peer device specified by bd_addr support BR/EDR
* Secure Connections.
*
* Parameters: bd_addr - address of the peer
*
* Returns true if BR/EDR Secure Connections are supported by both
* local and the remote device, else false.
*
******************************************************************************/
bool BTM_BothEndsSupportSecureConnections(const RawAddress& bd_addr) {
return ((controller_get_interface()->supports_secure_connections()) &&
(BTM_PeerSupportsSecureConnections(bd_addr)));
}
/*******************************************************************************
*
* Function BTM_PeerSupportsSecureConnections
*
* Description This function is called to check if the peer supports
* BR/EDR Secure Connections.
*
* Parameters: bd_addr - address of the peer
*
* Returns true if BR/EDR Secure Connections are supported by the peer,
* else false.
*
******************************************************************************/
bool BTM_PeerSupportsSecureConnections(const RawAddress& bd_addr) {
tBTM_SEC_DEV_REC* p_dev_rec;
p_dev_rec = btm_find_dev(bd_addr);
if (p_dev_rec == NULL) {
LOG(WARNING) << __func__ << ": unknown BDA: " << bd_addr;
return false;
}
return (p_dev_rec->remote_supports_secure_connections);
}
/*******************************************************************************
*
* Function BTM_ReadOobData
*
* Description This function is called to parse the OOB data payload
* received over OOB (non-Bluetooth) link
*
* Parameters: p_data - the location for OOB data
* eir_tag - The associated EIR tag to read the data.
* *p_len(output) - the length of the data with the given tag.
*
* Returns the beginning of the data with the given tag.
* NULL, if the tag is not found.
*
******************************************************************************/
uint8_t* BTM_ReadOobData(uint8_t* p_data, uint8_t eir_tag, uint8_t* p_len) {
uint8_t* p = p_data;
uint16_t max_len;
uint8_t len, type;
uint8_t* p_ret = NULL;
uint8_t ret_len = 0;
if (p_data) {
STREAM_TO_UINT16(max_len, p);
if (max_len >= BTM_OOB_MANDATORY_SIZE) {
if (BTM_EIR_OOB_BD_ADDR_TYPE == eir_tag) {
p_ret = p; /* the location for bd_addr */
ret_len = BTM_OOB_BD_ADDR_SIZE;
} else {
p += BD_ADDR_LEN;
max_len -= BTM_OOB_MANDATORY_SIZE;
/* now the optional data in EIR format */
while (max_len > 0) {
len = *p++; /* tag data len + 1 */
type = *p++;
if (eir_tag == type) {
p_ret = p;
ret_len = len - 1;
break;
}
/* the data size of this tag is len + 1 (tag data len + 2) */
if (max_len > len) {
max_len -= len;
max_len--;
len--;
p += len;
} else
max_len = 0;
}
}
}
}
if (p_len) *p_len = ret_len;
return p_ret;
}
/*******************************************************************************
*
* Function BTM_SetOutService
*
* Description This function is called to set the service for
* outgoing connections.
*
* If the profile/application calls BTM_SetSecurityLevel
* before initiating a connection, this function does not
* need to be called.
*
* Returns void
*
******************************************************************************/
void BTM_SetOutService(const RawAddress& bd_addr, uint8_t service_id,
uint32_t mx_chan_id) {
tBTM_SEC_DEV_REC* p_dev_rec;
tBTM_SEC_SERV_REC* p_serv_rec = &btm_cb.sec_serv_rec[0];
btm_cb.p_out_serv = p_serv_rec;
p_dev_rec = btm_find_dev(bd_addr);
for (int i = 0; i < BTM_SEC_MAX_SERVICE_RECORDS; i++, p_serv_rec++) {
if ((p_serv_rec->security_flags & BTM_SEC_IN_USE) &&
(p_serv_rec->service_id == service_id) &&
(p_serv_rec->orig_mx_chan_id == mx_chan_id)) {
BTM_TRACE_API(
"BTM_SetOutService p_out_serv id %d, psm 0x%04x, proto_id %d, "
"chan_id %d",
p_serv_rec->service_id, p_serv_rec->psm, p_serv_rec->mx_proto_id,
p_serv_rec->orig_mx_chan_id);
btm_cb.p_out_serv = p_serv_rec;
if (p_dev_rec) p_dev_rec->p_cur_service = p_serv_rec;
break;
}
}
}
/************************************************************************
* I N T E R N A L F U N C T I O N S
************************************************************************/
/*******************************************************************************
*
* Function btm_sec_is_upgrade_possible
*
* Description This function returns true if the existing link key
* can be upgraded or if the link key does not exist.
*
* Returns bool
*
******************************************************************************/
static bool btm_sec_is_upgrade_possible(tBTM_SEC_DEV_REC* p_dev_rec,
bool is_originator) {
uint16_t mtm_check = is_originator ? BTM_SEC_OUT_MITM : BTM_SEC_IN_MITM;
bool is_possible = true;
if (p_dev_rec->sec_flags & BTM_SEC_LINK_KEY_KNOWN) {
is_possible = false;
if (p_dev_rec->p_cur_service) {
BTM_TRACE_DEBUG(
"%s() id: %d, link_key_typet: %d, rmt_io_caps: %d, chk flags: 0x%x, "
"flags: 0x%x",
__func__, p_dev_rec->p_cur_service->service_id,
p_dev_rec->link_key_type, p_dev_rec->rmt_io_caps, mtm_check,
p_dev_rec->p_cur_service->security_flags);
} else {
BTM_TRACE_DEBUG(
"%s() link_key_typet: %d, rmt_io_caps: %d, chk flags: 0x%x", __func__,
p_dev_rec->link_key_type, p_dev_rec->rmt_io_caps, mtm_check);
}
/* Already have a link key to the connected peer. Is the link key secure
*enough?
** Is a link key upgrade even possible?
*/
if ((p_dev_rec->security_required & mtm_check) /* needs MITM */
&& ((p_dev_rec->link_key_type == BTM_LKEY_TYPE_UNAUTH_COMB) ||
(p_dev_rec->link_key_type == BTM_LKEY_TYPE_UNAUTH_COMB_P_256))
/* has unauthenticated
link key */
&& (p_dev_rec->rmt_io_caps < BTM_IO_CAP_MAX) /* a valid peer IO cap */
&& (btm_sec_io_map[p_dev_rec->rmt_io_caps][btm_cb.devcb.loc_io_caps]))
/* authenticated
link key is possible */
{
/* upgrade is possible: check if the application wants the upgrade.
* If the application is configured to use a global MITM flag,
* it probably would not want to upgrade the link key based on the
* security level database */
is_possible = true;
}
}
BTM_TRACE_DEBUG("%s() is_possible: %d sec_flags: 0x%x", __func__, is_possible,
p_dev_rec->sec_flags);
return is_possible;
}
/*******************************************************************************
*
* Function btm_sec_check_upgrade
*
* Description This function is called to check if the existing link key
* needs to be upgraded.
*
* Returns void
*
******************************************************************************/
static void btm_sec_check_upgrade(tBTM_SEC_DEV_REC* p_dev_rec,
bool is_originator) {
BTM_TRACE_DEBUG("%s()", __func__);
/* Only check if link key already exists */
if (!(p_dev_rec->sec_flags & BTM_SEC_LINK_KEY_KNOWN)) return;
if (btm_sec_is_upgrade_possible(p_dev_rec, is_originator)) {
BTM_TRACE_DEBUG("need upgrade!! sec_flags:0x%x", p_dev_rec->sec_flags);
/* upgrade is possible: check if the application wants the upgrade.
* If the application is configured to use a global MITM flag,
* it probably would not want to upgrade the link key based on the security
* level database */
tBTM_SP_UPGRADE evt_data;
evt_data.bd_addr = p_dev_rec->bd_addr;
evt_data.upgrade = true;
if (btm_cb.api.p_sp_callback)
(*btm_cb.api.p_sp_callback)(BTM_SP_UPGRADE_EVT,
(tBTM_SP_EVT_DATA*)&evt_data);
BTM_TRACE_DEBUG("evt_data.upgrade:0x%x", evt_data.upgrade);
if (evt_data.upgrade) {
/* if the application confirms the upgrade, set the upgrade bit */
p_dev_rec->sm4 |= BTM_SM4_UPGRADE;
/* Clear the link key known to go through authentication/pairing again */
p_dev_rec->sec_flags &=
~(BTM_SEC_LINK_KEY_KNOWN | BTM_SEC_LINK_KEY_AUTHED);
p_dev_rec->sec_flags &= ~BTM_SEC_AUTHENTICATED;
BTM_TRACE_DEBUG("sec_flags:0x%x", p_dev_rec->sec_flags);
}
}
}
/*******************************************************************************
*
* Function btm_sec_l2cap_access_req
*
* Description This function is called by the L2CAP to grant permission to
* establish L2CAP connection to or from the peer device.
*
* Parameters: bd_addr - Address of the peer device
* psm - L2CAP PSM
* is_originator - true if protocol above L2CAP originates
* connection
* p_callback - Pointer to callback function called if
* this function returns PENDING after required
* procedures are complete. MUST NOT BE NULL.
*
* Returns tBTM_STATUS
*
******************************************************************************/
tBTM_STATUS btm_sec_l2cap_access_req(const RawAddress& bd_addr, uint16_t psm,
uint16_t handle, CONNECTION_TYPE conn_type,
tBTM_SEC_CALLBACK* p_callback,
void* p_ref_data) {
tBTM_SEC_DEV_REC* p_dev_rec;
tBTM_SEC_SERV_REC* p_serv_rec;
uint16_t security_required;
uint16_t old_security_required;
bool old_is_originator;
tBTM_STATUS rc = BTM_SUCCESS;
bool chk_acp_auth_done = false;
bool is_originator;
tBT_TRANSPORT transport =
BT_TRANSPORT_BR_EDR; /* should check PSM range in LE connection oriented
L2CAP connection */
is_originator = conn_type;
BTM_TRACE_DEBUG("%s() is_originator:%d, 0x%x, psm=0x%04x", __func__,
is_originator, p_ref_data, psm);
/* Find or get oldest record */
p_dev_rec = btm_find_or_alloc_dev(bd_addr);
p_dev_rec->hci_handle = handle;
/* Find the service record for the PSM */
p_serv_rec = btm_sec_find_first_serv(conn_type, psm);
/* If there is no application registered with this PSM do not allow connection
*/
if (!p_serv_rec) {
BTM_TRACE_WARNING("%s() PSM: %d no application registerd", __func__, psm);
(*p_callback)(&bd_addr, transport, p_ref_data, BTM_MODE_UNSUPPORTED);
return (BTM_MODE_UNSUPPORTED);
}
/* Services level0 by default have no security */
if ((btm_sec_is_serv_level0(psm)) &&
(!btm_cb.devcb.secure_connections_only)) {
(*p_callback)(&bd_addr, transport, p_ref_data, BTM_SUCCESS_NO_SECURITY);
return (BTM_SUCCESS);
}
if (btm_cb.security_mode == BTM_SEC_MODE_SC) {
security_required = btm_sec_set_serv_level4_flags(
p_serv_rec->security_flags, is_originator);
} else {
security_required = p_serv_rec->security_flags;
}
BTM_TRACE_DEBUG(
"%s: security_required 0x%04x, is_originator 0x%02x, psm 0x%04x",
__func__, security_required, is_originator, psm);
if ((!is_originator) && (security_required & BTM_SEC_MODE4_LEVEL4)) {
bool local_supports_sc =
controller_get_interface()->supports_secure_connections();
/* acceptor receives L2CAP Channel Connect Request for Secure Connections
* Only service */
if (!(local_supports_sc) ||
!(p_dev_rec->remote_supports_secure_connections)) {
BTM_TRACE_DEBUG("%s: SC only service, local_support_for_sc %d",
"rmt_support_for_sc : %d -> fail pairing", __func__,
local_supports_sc,
p_dev_rec->remote_supports_secure_connections);
if (p_callback)
(*p_callback)(&bd_addr, transport, (void*)p_ref_data,
BTM_MODE4_LEVEL4_NOT_SUPPORTED);
return (BTM_MODE4_LEVEL4_NOT_SUPPORTED);
}
}
/* there are some devices (moto KRZR) which connects to several services at
* the same time */
/* we will process one after another */
if ((p_dev_rec->p_callback) ||
(btm_cb.pairing_state != BTM_PAIR_STATE_IDLE)) {
BTM_TRACE_EVENT("%s() - busy - PSM:%d delayed state: %s mode:%d, sm4:0x%x",
__func__, psm, btm_pair_state_descr(btm_cb.pairing_state),
btm_cb.security_mode, p_dev_rec->sm4);
BTM_TRACE_EVENT("security_flags:x%x, sec_flags:x%x", security_required,
p_dev_rec->sec_flags);
rc = BTM_CMD_STARTED;
if ((btm_cb.security_mode == BTM_SEC_MODE_UNDEFINED ||
btm_cb.security_mode == BTM_SEC_MODE_NONE ||
btm_cb.security_mode == BTM_SEC_MODE_SERVICE ||
btm_cb.security_mode == BTM_SEC_MODE_LINK) ||
(BTM_SM4_KNOWN == p_dev_rec->sm4) ||
(BTM_SEC_IS_SM4(p_dev_rec->sm4) &&
(!btm_sec_is_upgrade_possible(p_dev_rec, is_originator)))) {
/* legacy mode - local is legacy or local is lisbon/peer is legacy
* or SM4 with no possibility of link key upgrade */
if (is_originator) {
if (((security_required & BTM_SEC_OUT_FLAGS) == 0) ||
((((security_required & BTM_SEC_OUT_FLAGS) ==
BTM_SEC_OUT_AUTHENTICATE) &&
btm_dev_authenticated(p_dev_rec))) ||
((((security_required & BTM_SEC_OUT_FLAGS) ==
(BTM_SEC_OUT_AUTHENTICATE | BTM_SEC_OUT_ENCRYPT)) &&
btm_dev_encrypted(p_dev_rec))) ||
((((security_required & BTM_SEC_OUT_FLAGS) == BTM_SEC_OUT_FLAGS) &&
btm_dev_authorized(p_dev_rec) && btm_dev_encrypted(p_dev_rec)))) {
rc = BTM_SUCCESS;
}
} else {
if (((security_required & BTM_SEC_IN_FLAGS) == 0) ||
(((security_required & BTM_SEC_IN_FLAGS) ==
BTM_SEC_IN_AUTHENTICATE) &&
btm_dev_authenticated(p_dev_rec)) ||
(((security_required & BTM_SEC_IN_FLAGS) ==
(BTM_SEC_IN_AUTHENTICATE | BTM_SEC_IN_ENCRYPT)) &&
btm_dev_encrypted(p_dev_rec)) ||
(((security_required & BTM_SEC_IN_FLAGS) == BTM_SEC_IN_AUTHORIZE) &&
(btm_dev_authorized(p_dev_rec) ||
btm_serv_trusted(p_dev_rec, p_serv_rec))) ||
(((security_required & BTM_SEC_IN_FLAGS) ==
(BTM_SEC_IN_AUTHENTICATE | BTM_SEC_IN_AUTHORIZE)) &&
((btm_dev_authorized(p_dev_rec) ||
btm_serv_trusted(p_dev_rec, p_serv_rec)) &&
btm_dev_authenticated(p_dev_rec))) ||
(((security_required & BTM_SEC_IN_FLAGS) ==
(BTM_SEC_IN_ENCRYPT | BTM_SEC_IN_AUTHORIZE)) &&
((btm_dev_authorized(p_dev_rec) ||
btm_serv_trusted(p_dev_rec, p_serv_rec)) &&
btm_dev_encrypted(p_dev_rec))) ||
(((security_required & BTM_SEC_IN_FLAGS) == BTM_SEC_IN_FLAGS) &&
btm_dev_encrypted(p_dev_rec) &&
(btm_dev_authorized(p_dev_rec) ||
btm_serv_trusted(p_dev_rec, p_serv_rec)))) {
// Check for 16 digits (or MITM)
if (((security_required & BTM_SEC_IN_MIN_16_DIGIT_PIN) == 0) ||
(((security_required & BTM_SEC_IN_MIN_16_DIGIT_PIN) ==
BTM_SEC_IN_MIN_16_DIGIT_PIN) &&
btm_dev_16_digit_authenticated(p_dev_rec))) {
rc = BTM_SUCCESS;
}
}
}
if ((rc == BTM_SUCCESS) && (security_required & BTM_SEC_MODE4_LEVEL4) &&
(p_dev_rec->link_key_type != BTM_LKEY_TYPE_AUTH_COMB_P_256)) {
rc = BTM_CMD_STARTED;
}
if (rc == BTM_SUCCESS) {
if (p_callback)
(*p_callback)(&bd_addr, transport, (void*)p_ref_data, BTM_SUCCESS);
return (BTM_SUCCESS);
}
}
btm_cb.sec_req_pending = true;
return (BTM_CMD_STARTED);
}
/* Save pointer to service record */
p_dev_rec->p_cur_service = p_serv_rec;
/* Modify security_required in btm_sec_l2cap_access_req for Lisbon */
if (btm_cb.security_mode == BTM_SEC_MODE_SP ||
btm_cb.security_mode == BTM_SEC_MODE_SP_DEBUG ||
btm_cb.security_mode == BTM_SEC_MODE_SC) {
if (BTM_SEC_IS_SM4(p_dev_rec->sm4)) {
if (is_originator) {
/* SM4 to SM4 -> always authenticate & encrypt */
security_required |= (BTM_SEC_OUT_AUTHENTICATE | BTM_SEC_OUT_ENCRYPT);
} else /* acceptor */
{
/* SM4 to SM4: the acceptor needs to make sure the authentication is
* already done */
chk_acp_auth_done = true;
/* SM4 to SM4 -> always authenticate & encrypt */
security_required |= (BTM_SEC_IN_AUTHENTICATE | BTM_SEC_IN_ENCRYPT);
}
} else if (!(BTM_SM4_KNOWN & p_dev_rec->sm4)) {
/* the remote features are not known yet */
BTM_TRACE_DEBUG("%s: (%s) remote features unknown!!sec_flags:0x%02x",
__func__, (is_originator) ? "initiator" : "acceptor",
p_dev_rec->sec_flags);
p_dev_rec->sm4 |= BTM_SM4_REQ_PEND;
return (BTM_CMD_STARTED);
}
}
BTM_TRACE_DEBUG(
"%s() sm4:0x%x, sec_flags:0x%x, security_required:0x%x chk:%d", __func__,
p_dev_rec->sm4, p_dev_rec->sec_flags, security_required,
chk_acp_auth_done);
old_security_required = p_dev_rec->security_required;
old_is_originator = p_dev_rec->is_originator;
p_dev_rec->security_required = security_required;
p_dev_rec->p_ref_data = p_ref_data;
p_dev_rec->is_originator = is_originator;
/* If there are multiple service records used through the same PSM */
/* leave security decision for the multiplexor on the top */
if ((btm_sec_find_next_serv(p_serv_rec)) != NULL) {
BTM_TRACE_DEBUG("no next_serv sm4:0x%x, chk:%d", p_dev_rec->sm4,
chk_acp_auth_done);
if (!BTM_SEC_IS_SM4(p_dev_rec->sm4)) {
BTM_TRACE_EVENT(
"Security Manager: l2cap_access_req PSM:%d postponed for multiplexer",
psm);
/* pre-Lisbon: restore the old settings */
p_dev_rec->security_required = old_security_required;
p_dev_rec->is_originator = old_is_originator;
(*p_callback)(&bd_addr, transport, p_ref_data, BTM_SUCCESS);
return (BTM_SUCCESS);
}
}
/* if the originator is using dynamic PSM in legacy mode, do not start any
* security process now
* The layer above L2CAP needs to carry out the security requirement after
* L2CAP connect
* response is received */
if (is_originator &&
((btm_cb.security_mode == BTM_SEC_MODE_UNDEFINED ||
btm_cb.security_mode == BTM_SEC_MODE_NONE ||
btm_cb.security_mode == BTM_SEC_MODE_SERVICE ||
btm_cb.security_mode == BTM_SEC_MODE_LINK) ||
!BTM_SEC_IS_SM4(p_dev_rec->sm4)) &&
(psm >= 0x1001)) {
BTM_TRACE_EVENT(
"dynamic PSM:0x%x in legacy mode - postponed for upper layer", psm);
/* restore the old settings */
p_dev_rec->security_required = old_security_required;
p_dev_rec->is_originator = old_is_originator;
(*p_callback)(&bd_addr, transport, p_ref_data, BTM_SUCCESS);
return (BTM_SUCCESS);
}
if (chk_acp_auth_done) {
BTM_TRACE_DEBUG(
"(SM4 to SM4) btm_sec_l2cap_access_req rspd. authenticated: x%x, enc: "
"x%x",
(p_dev_rec->sec_flags & BTM_SEC_AUTHENTICATED),
(p_dev_rec->sec_flags & BTM_SEC_ENCRYPTED));
/* SM4, but we do not know for sure which level of security we need.
* as long as we have a link key, it's OK */
if ((0 == (p_dev_rec->sec_flags & BTM_SEC_AUTHENTICATED)) ||
(0 == (p_dev_rec->sec_flags & BTM_SEC_ENCRYPTED))) {
rc = BTM_DELAY_CHECK;
/*
2046 may report HCI_Encryption_Change and L2C Connection Request out of
sequence
because of data path issues. Delay this disconnect a little bit
*/
LOG_INFO(
LOG_TAG,
"%s peer should have initiated security process by now (SM4 to SM4)",
__func__);
p_dev_rec->p_callback = p_callback;
p_dev_rec->sec_state = BTM_SEC_STATE_DELAY_FOR_ENC;
(*p_callback)(&bd_addr, transport, p_ref_data, rc);
return BTM_SUCCESS;
}
}
p_dev_rec->p_callback = p_callback;
if (p_dev_rec->last_author_service_id == BTM_SEC_NO_LAST_SERVICE_ID ||
p_dev_rec->last_author_service_id !=
p_dev_rec->p_cur_service->service_id) {
/* Although authentication and encryption are per connection
** authorization is per access request. For example when serial connection
** is up and authorized and client requests to read file (access to other
** scn), we need to request user's permission again.
*/
p_dev_rec->sec_flags &= ~BTM_SEC_AUTHORIZED;
}
if (BTM_SEC_IS_SM4(p_dev_rec->sm4)) {
if ((p_dev_rec->security_required & BTM_SEC_MODE4_LEVEL4) &&
(p_dev_rec->link_key_type != BTM_LKEY_TYPE_AUTH_COMB_P_256)) {
/* BTM_LKEY_TYPE_AUTH_COMB_P_256 is the only acceptable key in this case
*/
if ((p_dev_rec->sec_flags & BTM_SEC_LINK_KEY_KNOWN) != 0) {
p_dev_rec->sm4 |= BTM_SM4_UPGRADE;
}
p_dev_rec->sec_flags &=
~(BTM_SEC_LINK_KEY_KNOWN | BTM_SEC_LINK_KEY_AUTHED |
BTM_SEC_AUTHENTICATED);
BTM_TRACE_DEBUG("%s: sec_flags:0x%x", __func__, p_dev_rec->sec_flags);
} else {
/* If we already have a link key to the connected peer, is it secure
* enough? */
btm_sec_check_upgrade(p_dev_rec, is_originator);
}
}
BTM_TRACE_EVENT(
"%s() PSM:%d Handle:%d State:%d Flags: 0x%x Required: 0x%x Service ID:%d",
__func__, psm, handle, p_dev_rec->sec_state, p_dev_rec->sec_flags,
p_dev_rec->security_required, p_dev_rec->p_cur_service->service_id);
rc = btm_sec_execute_procedure(p_dev_rec);
if (rc != BTM_CMD_STARTED) {
BTM_TRACE_DEBUG("%s: p_dev_rec=%p, clearing callback. old p_callback=%p",
__func__, p_dev_rec, p_dev_rec->p_callback);
p_dev_rec->p_callback = NULL;
(*p_callback)(&bd_addr, transport, p_dev_rec->p_ref_data, (uint8_t)rc);
}
return (rc);
}
/*******************************************************************************
*
* Function btm_sec_mx_access_request
*
* Description This function is called by all Multiplexing Protocols during
* establishing connection to or from peer device to grant
* permission to establish application connection.
*
* Parameters: bd_addr - Address of the peer device
* psm - L2CAP PSM
* is_originator - true if protocol above L2CAP originates
* connection
* mx_proto_id - protocol ID of the multiplexer
* mx_chan_id - multiplexer channel to reach application
* p_callback - Pointer to callback function called if
* this function returns PENDING after required
* procedures are completed
* p_ref_data - Pointer to any reference data needed by the
* the callback function.
*
* Returns BTM_CMD_STARTED
*
******************************************************************************/
tBTM_STATUS btm_sec_mx_access_request(const RawAddress& bd_addr, uint16_t psm,
bool is_originator, uint32_t mx_proto_id,
uint32_t mx_chan_id,
tBTM_SEC_CALLBACK* p_callback,
void* p_ref_data) {
tBTM_SEC_DEV_REC* p_dev_rec;
tBTM_SEC_SERV_REC* p_serv_rec;
tBTM_STATUS rc;
uint16_t security_required;
bool transport = false; /* should check PSM range in LE connection oriented
L2CAP connection */
BTM_TRACE_DEBUG("%s() is_originator: %d", __func__, is_originator);
/* Find or get oldest record */
p_dev_rec = btm_find_or_alloc_dev(bd_addr);
/* Find the service record for the PSM */
p_serv_rec =
btm_sec_find_mx_serv(is_originator, psm, mx_proto_id, mx_chan_id);
/* If there is no application registered with this PSM do not allow connection
*/
if (!p_serv_rec) {
if (p_callback)
(*p_callback)(&bd_addr, transport, p_ref_data, BTM_MODE_UNSUPPORTED);
BTM_TRACE_ERROR(
"Security Manager: MX service not found PSM:%d Proto:%d SCN:%d", psm,
mx_proto_id, mx_chan_id);
return BTM_NO_RESOURCES;
}
if ((btm_cb.security_mode == BTM_SEC_MODE_SC) &&
(!btm_sec_is_serv_level0(psm))) {
security_required = btm_sec_set_serv_level4_flags(
p_serv_rec->security_flags, is_originator);
} else {
security_required = p_serv_rec->security_flags;
}
/* there are some devices (moto phone) which connects to several services at
* the same time */
/* we will process one after another */
if ((p_dev_rec->p_callback) ||
(btm_cb.pairing_state != BTM_PAIR_STATE_IDLE)) {
BTM_TRACE_EVENT("%s() service PSM:%d Proto:%d SCN:%d delayed state: %s",
__func__, psm, mx_proto_id, mx_chan_id,
btm_pair_state_descr(btm_cb.pairing_state));
rc = BTM_CMD_STARTED;
if ((btm_cb.security_mode == BTM_SEC_MODE_UNDEFINED ||
btm_cb.security_mode == BTM_SEC_MODE_NONE ||
btm_cb.security_mode == BTM_SEC_MODE_SERVICE ||
btm_cb.security_mode == BTM_SEC_MODE_LINK) ||
(BTM_SM4_KNOWN == p_dev_rec->sm4) ||
(BTM_SEC_IS_SM4(p_dev_rec->sm4) &&
(!btm_sec_is_upgrade_possible(p_dev_rec, is_originator)))) {
/* legacy mode - local is legacy or local is lisbon/peer is legacy
* or SM4 with no possibility of link key upgrade */
if (is_originator) {
if (((security_required & BTM_SEC_OUT_FLAGS) == 0) ||
((((security_required & BTM_SEC_OUT_FLAGS) ==
BTM_SEC_OUT_AUTHENTICATE) &&
btm_dev_authenticated(p_dev_rec))) ||
((((security_required & BTM_SEC_OUT_FLAGS) ==
(BTM_SEC_OUT_AUTHENTICATE | BTM_SEC_OUT_ENCRYPT)) &&
btm_dev_encrypted(p_dev_rec)))) {
rc = BTM_SUCCESS;
}
} else {
if (((security_required & BTM_SEC_IN_FLAGS) == 0) ||
((((security_required & BTM_SEC_IN_FLAGS) ==
BTM_SEC_IN_AUTHENTICATE) &&
btm_dev_authenticated(p_dev_rec))) ||
(((security_required & BTM_SEC_IN_FLAGS) == BTM_SEC_IN_AUTHORIZE) &&
(btm_dev_authorized(p_dev_rec) ||
btm_serv_trusted(p_dev_rec, p_serv_rec))) ||
(((security_required & BTM_SEC_IN_FLAGS) ==
(BTM_SEC_IN_AUTHORIZE | BTM_SEC_IN_AUTHENTICATE)) &&
((btm_dev_authorized(p_dev_rec) ||
btm_serv_trusted(p_dev_rec, p_serv_rec)) &&
btm_dev_authenticated(p_dev_rec))) ||
(((security_required & BTM_SEC_IN_FLAGS) ==
(BTM_SEC_IN_AUTHORIZE | BTM_SEC_IN_ENCRYPT)) &&
((btm_dev_authorized(p_dev_rec) ||
btm_serv_trusted(p_dev_rec, p_serv_rec)) &&
btm_dev_encrypted(p_dev_rec))) ||
((((security_required & BTM_SEC_IN_FLAGS) ==
(BTM_SEC_IN_AUTHENTICATE | BTM_SEC_IN_ENCRYPT)) &&
btm_dev_encrypted(p_dev_rec)))) {
// Check for 16 digits (or MITM)
if (((security_required & BTM_SEC_IN_MIN_16_DIGIT_PIN) == 0) ||
(((security_required & BTM_SEC_IN_MIN_16_DIGIT_PIN) ==
BTM_SEC_IN_MIN_16_DIGIT_PIN) &&
btm_dev_16_digit_authenticated(p_dev_rec))) {
rc = BTM_SUCCESS;
}
}
}
if ((rc == BTM_SUCCESS) && (security_required & BTM_SEC_MODE4_LEVEL4) &&
(p_dev_rec->link_key_type != BTM_LKEY_TYPE_AUTH_COMB_P_256)) {
rc = BTM_CMD_STARTED;
}
}
if (rc == BTM_SUCCESS) {
BTM_TRACE_EVENT("%s: allow to bypass, checking authorization", __func__);
/* the security in BTM_SEC_IN_FLAGS is fullfilled so far, check the
* requirements in */
/* btm_sec_execute_procedure */
if ((is_originator &&
(p_serv_rec->security_flags & BTM_SEC_OUT_AUTHORIZE)) ||
(!is_originator &&
(p_serv_rec->security_flags & BTM_SEC_IN_AUTHORIZE))) {
BTM_TRACE_EVENT("%s: still need authorization", __func__);
rc = BTM_CMD_STARTED;
}
}
/* Check whether there is a pending security procedure, if so we should
* always queue */
/* the new security request */
if (p_dev_rec->sec_state != BTM_SEC_STATE_IDLE) {
BTM_TRACE_EVENT("%s: There is a pending security procedure", __func__);
rc = BTM_CMD_STARTED;
}
if (rc == BTM_CMD_STARTED) {
BTM_TRACE_EVENT("%s: call btm_sec_queue_mx_request", __func__);
btm_sec_queue_mx_request(bd_addr, psm, is_originator, mx_proto_id,
mx_chan_id, p_callback, p_ref_data);
} else /* rc == BTM_SUCCESS */
{
/* access granted */
if (p_callback) {
(*p_callback)(&bd_addr, transport, p_ref_data, (uint8_t)rc);
}
}
BTM_TRACE_EVENT("%s: return with rc = 0x%02x in delayed state %s", __func__,
rc, btm_pair_state_descr(btm_cb.pairing_state));
return rc;
}
if ((!is_originator) && ((security_required & BTM_SEC_MODE4_LEVEL4) ||
(btm_cb.security_mode == BTM_SEC_MODE_SC))) {
bool local_supports_sc =
controller_get_interface()->supports_secure_connections();
/* acceptor receives service connection establishment Request for */
/* Secure Connections Only service */
if (!(local_supports_sc) ||
!(p_dev_rec->remote_supports_secure_connections)) {
BTM_TRACE_DEBUG("%s: SC only service,local_support_for_sc %d,",
"remote_support_for_sc %d: fail pairing", __func__,
local_supports_sc,
p_dev_rec->remote_supports_secure_connections);
if (p_callback)
(*p_callback)(&bd_addr, transport, (void*)p_ref_data,
BTM_MODE4_LEVEL4_NOT_SUPPORTED);
return (BTM_MODE4_LEVEL4_NOT_SUPPORTED);
}
}
p_dev_rec->p_cur_service = p_serv_rec;
p_dev_rec->security_required = security_required;
if (btm_cb.security_mode == BTM_SEC_MODE_SP ||
btm_cb.security_mode == BTM_SEC_MODE_SP_DEBUG ||
btm_cb.security_mode == BTM_SEC_MODE_SC) {
if (BTM_SEC_IS_SM4(p_dev_rec->sm4)) {
if ((p_dev_rec->security_required & BTM_SEC_MODE4_LEVEL4) &&
(p_dev_rec->link_key_type != BTM_LKEY_TYPE_AUTH_COMB_P_256)) {
/* BTM_LKEY_TYPE_AUTH_COMB_P_256 is the only acceptable key in this case
*/
if ((p_dev_rec->sec_flags & BTM_SEC_LINK_KEY_KNOWN) != 0) {
p_dev_rec->sm4 |= BTM_SM4_UPGRADE;
}
p_dev_rec->sec_flags &=
~(BTM_SEC_LINK_KEY_KNOWN | BTM_SEC_LINK_KEY_AUTHED |
BTM_SEC_AUTHENTICATED);
BTM_TRACE_DEBUG("%s: sec_flags:0x%x", __func__, p_dev_rec->sec_flags);
} else {
/* If we already have a link key, check if that link key is good enough
*/
btm_sec_check_upgrade(p_dev_rec, is_originator);
}
}
}
p_dev_rec->is_originator = is_originator;
p_dev_rec->p_callback = p_callback;
p_dev_rec->p_ref_data = p_ref_data;
/* Although authentication and encryption are per connection */
/* authorization is per access request. For example when serial connection */
/* is up and authorized and client requests to read file (access to other */
/* scn, we need to request user's permission again. */
p_dev_rec->sec_flags &= ~(BTM_SEC_AUTHORIZED);
BTM_TRACE_EVENT(
"%s() proto_id:%d chan_id:%d State:%d Flags:0x%x Required:0x%x Service "
"ID:%d",
__func__, mx_proto_id, mx_chan_id, p_dev_rec->sec_state,
p_dev_rec->sec_flags, p_dev_rec->security_required,
p_dev_rec->p_cur_service->service_id);
rc = btm_sec_execute_procedure(p_dev_rec);
if (rc != BTM_CMD_STARTED) {
if (p_callback) {
p_dev_rec->p_callback = NULL;
(*p_callback)(&bd_addr, transport, p_ref_data, (uint8_t)rc);
}
}
return rc;
}
/*******************************************************************************
*
* Function btm_sec_conn_req
*
* Description This function is when the peer device is requesting
* connection
*
* Returns void
*
******************************************************************************/
void btm_sec_conn_req(const RawAddress& bda, uint8_t* dc) {
tBTM_SEC_DEV_REC* p_dev_rec = btm_find_dev(bda);
/* Some device may request a connection before we are done with the HCI_Reset
* sequence */
if (!controller_get_interface()->get_is_ready()) {
BTM_TRACE_EVENT("Security Manager: connect request when device not ready");
btsnd_hcic_reject_conn(bda, HCI_ERR_HOST_REJECT_DEVICE);
return;
}
/* Security guys wants us not to allow connection from not paired devices */
/* Check if connection is allowed for only paired devices */
if (btm_cb.connect_only_paired) {
if (!p_dev_rec || !(p_dev_rec->sec_flags & BTM_SEC_LINK_KEY_AUTHED)) {
BTM_TRACE_EVENT(
"Security Manager: connect request from non-paired device");
btsnd_hcic_reject_conn(bda, HCI_ERR_HOST_REJECT_DEVICE);
return;
}
}
#if (BTM_ALLOW_CONN_IF_NONDISCOVER == FALSE)
/* If non-discoverable, only allow known devices to connect */
if (btm_cb.btm_inq_vars.discoverable_mode == BTM_NON_DISCOVERABLE) {
if (!p_dev_rec) {
BTM_TRACE_EVENT(
"Security Manager: connect request from not paired device");
btsnd_hcic_reject_conn(bda, HCI_ERR_HOST_REJECT_DEVICE);
return;
}
}
#endif
if ((btm_cb.pairing_state != BTM_PAIR_STATE_IDLE) &&
(btm_cb.pairing_flags & BTM_PAIR_FLAGS_WE_STARTED_DD) &&
(btm_cb.pairing_bda == bda)) {
BTM_TRACE_EVENT(
"Security Manager: reject connect request from bonding device");
/* incoming connection from bonding device is rejected */
btm_cb.pairing_flags |= BTM_PAIR_FLAGS_REJECTED_CONNECT;
btsnd_hcic_reject_conn(bda, HCI_ERR_HOST_REJECT_DEVICE);
return;
}
/* Host is not interested or approved connection. Save BDA and DC and */
/* pass request to L2CAP */
btm_cb.connecting_bda = bda;
memcpy(btm_cb.connecting_dc, dc, DEV_CLASS_LEN);
if (l2c_link_hci_conn_req(bda)) {
if (!p_dev_rec) {
/* accept the connection -> allocate a device record */
p_dev_rec = btm_sec_alloc_dev(bda);
}
if (p_dev_rec) {
p_dev_rec->sm4 |= BTM_SM4_CONN_PEND;
}
}
}
/*******************************************************************************
*
* Function btm_sec_bond_cancel_complete
*
* Description This function is called to report bond cancel complete
* event.
*
* Returns void
*
******************************************************************************/
static void btm_sec_bond_cancel_complete(void) {
tBTM_SEC_DEV_REC* p_dev_rec;
if ((btm_cb.pairing_flags & BTM_PAIR_FLAGS_DISC_WHEN_DONE) ||
(BTM_PAIR_STATE_WAIT_LOCAL_PIN == btm_cb.pairing_state &&
BTM_PAIR_FLAGS_WE_STARTED_DD & btm_cb.pairing_flags) ||
(btm_cb.pairing_state == BTM_PAIR_STATE_GET_REM_NAME &&
BTM_PAIR_FLAGS_WE_CANCEL_DD & btm_cb.pairing_flags)) {
/* for dedicated bonding in legacy mode, authentication happens at "link
* level"
* btm_sec_connected is called with failed status.
* In theory, the code that handles is_pairing_device/true should clean out
* security related code.
* However, this function may clean out the security related flags and
* btm_sec_connected would not know
* this function also needs to do proper clean up.
*/
p_dev_rec = btm_find_dev(btm_cb.pairing_bda);
if (p_dev_rec != NULL) p_dev_rec->security_required = BTM_SEC_NONE;
btm_sec_change_pairing_state(BTM_PAIR_STATE_IDLE);
/* Notify application that the cancel succeeded */
if (btm_cb.api.p_bond_cancel_cmpl_callback)
btm_cb.api.p_bond_cancel_cmpl_callback(BTM_SUCCESS);
}
}
/*******************************************************************************
*
* Function btm_create_conn_cancel_complete
*
* Description This function is called when the command complete message
* is received from the HCI for the create connection cancel
* command.
*
* Returns void
*
******************************************************************************/
void btm_create_conn_cancel_complete(uint8_t* p) {
uint8_t status;
STREAM_TO_UINT8(status, p);
RawAddress bd_addr;
STREAM_TO_BDADDR(bd_addr, p);
BTM_TRACE_EVENT("btm_create_conn_cancel_complete(): in State: %s status:%d",
btm_pair_state_descr(btm_cb.pairing_state), status);
bluetooth::common::LogLinkLayerConnectionEvent(
&bd_addr, bluetooth::common::kUnknownConnectionHandle,
android::bluetooth::DIRECTION_OUTGOING, android::bluetooth::LINK_TYPE_ACL,
android::bluetooth::hci::CMD_CREATE_CONNECTION_CANCEL,
android::bluetooth::hci::EVT_COMMAND_COMPLETE,
android::bluetooth::hci::BLE_EVT_UNKNOWN, status,
android::bluetooth::hci::STATUS_UNKNOWN);
/* if the create conn cancel cmd was issued by the bond cancel,
** the application needs to be notified that bond cancel succeeded
*/
switch (status) {
case HCI_SUCCESS:
btm_sec_bond_cancel_complete();
break;
case HCI_ERR_CONNECTION_EXISTS:
case HCI_ERR_NO_CONNECTION:
default:
/* Notify application of the error */
if (btm_cb.api.p_bond_cancel_cmpl_callback)
btm_cb.api.p_bond_cancel_cmpl_callback(BTM_ERR_PROCESSING);
break;
}
}
/*******************************************************************************
*
* Function btm_sec_check_pending_reqs
*
* Description This function is called at the end of the security procedure
* to let L2CAP and RFCOMM know to re-submit any pending
* requests
*
* Returns void
*
******************************************************************************/
void btm_sec_check_pending_reqs(void) {
if (btm_cb.pairing_state == BTM_PAIR_STATE_IDLE) {
/* First, resubmit L2CAP requests */
if (btm_cb.sec_req_pending) {
btm_cb.sec_req_pending = false;
l2cu_resubmit_pending_sec_req(nullptr);
}
/* Now, re-submit anything in the mux queue */
fixed_queue_t* bq = btm_cb.sec_pending_q;
btm_cb.sec_pending_q = fixed_queue_new(SIZE_MAX);
tBTM_SEC_QUEUE_ENTRY* p_e;
while ((p_e = (tBTM_SEC_QUEUE_ENTRY*)fixed_queue_try_dequeue(bq)) != NULL) {
/* Check that the ACL is still up before starting security procedures */
if (btm_bda_to_acl(p_e->bd_addr, p_e->transport) != NULL) {
if (p_e->psm != 0) {
BTM_TRACE_EVENT(
"%s PSM:0x%04x Is_Orig:%u mx_proto_id:%u mx_chan_id:%u", __func__,
p_e->psm, p_e->is_orig, p_e->mx_proto_id, p_e->mx_chan_id);
btm_sec_mx_access_request(p_e->bd_addr, p_e->psm, p_e->is_orig,
p_e->mx_proto_id, p_e->mx_chan_id,
p_e->p_callback, p_e->p_ref_data);
} else {
BTM_SetEncryption(p_e->bd_addr, p_e->transport, p_e->p_callback,
p_e->p_ref_data, p_e->sec_act);
}
}
osi_free(p_e);
}
fixed_queue_free(bq, NULL);
}
}
/*******************************************************************************
*
* Function btm_sec_init
*
* Description This function is on the SEC startup
*
* Returns void
*
******************************************************************************/
void btm_sec_init(uint8_t sec_mode) {
btm_cb.security_mode = sec_mode;
btm_cb.pairing_bda = RawAddress::kAny;
}
/*******************************************************************************
*
* Function btm_sec_device_down
*
* Description This function should be called when device is disabled or
* turned off
*
* Returns void
*
******************************************************************************/
void btm_sec_device_down(void) {
BTM_TRACE_EVENT("%s() State: %s", __func__,
btm_pair_state_descr(btm_cb.pairing_state));
btm_sec_change_pairing_state(BTM_PAIR_STATE_IDLE);
}
/*******************************************************************************
*
* Function btm_sec_dev_reset
*
* Description This function should be called after device reset
*
* Returns void
*
******************************************************************************/
void btm_sec_dev_reset(void) {
if (controller_get_interface()->supports_simple_pairing()) {
/* set the default IO capabilities */
btm_cb.devcb.loc_io_caps = btif_storage_get_local_io_caps();
/* add mx service to use no security */
BTM_SetSecurityLevel(false, "RFC_MUX", BTM_SEC_SERVICE_RFC_MUX,
BTM_SEC_NONE, BT_PSM_RFCOMM, BTM_SEC_PROTO_RFCOMM, 0);
} else {
btm_cb.security_mode = BTM_SEC_MODE_SERVICE;
}
BTM_TRACE_DEBUG("btm_sec_dev_reset sec mode: %d", btm_cb.security_mode);
}
/*******************************************************************************
*
* Function btm_sec_abort_access_req
*
* Description This function is called by the L2CAP or RFCOMM to abort
* the pending operation.
*
* Parameters: bd_addr - Address of the peer device
*
* Returns void
*
******************************************************************************/
void btm_sec_abort_access_req(const RawAddress& bd_addr) {
tBTM_SEC_DEV_REC* p_dev_rec = btm_find_dev(bd_addr);
if (!p_dev_rec) return;
if ((p_dev_rec->sec_state != BTM_SEC_STATE_AUTHORIZING) &&
(p_dev_rec->sec_state != BTM_SEC_STATE_AUTHENTICATING))
return;
p_dev_rec->sec_state = BTM_SEC_STATE_IDLE;
BTM_TRACE_DEBUG("%s: clearing callback. p_dev_rec=%p, p_callback=%p",
__func__, p_dev_rec, p_dev_rec->p_callback);
p_dev_rec->p_callback = NULL;
}
/*******************************************************************************
*
* Function btm_sec_dd_create_conn
*
* Description This function is called to create the ACL connection for
* the dedicated boding process
*
* Returns void
*
******************************************************************************/
static tBTM_STATUS btm_sec_dd_create_conn(tBTM_SEC_DEV_REC* p_dev_rec) {
tL2C_LCB* p_lcb =
l2cu_find_lcb_by_bd_addr(p_dev_rec->bd_addr, BT_TRANSPORT_BR_EDR);
if (p_lcb && (p_lcb->link_state == LST_CONNECTED ||
p_lcb->link_state == LST_CONNECTING)) {
BTM_TRACE_WARNING("%s Connection already exists", __func__);
btm_sec_change_pairing_state(BTM_PAIR_STATE_WAIT_PIN_REQ);
return BTM_CMD_STARTED;
}
/* Make sure an L2cap link control block is available */
if (!p_lcb && (p_lcb = l2cu_allocate_lcb(p_dev_rec->bd_addr, true,
BT_TRANSPORT_BR_EDR)) == NULL) {
LOG(WARNING) << "Security Manager: failed allocate LCB "
<< p_dev_rec->bd_addr;
return (BTM_NO_RESOURCES);
}
/* set up the control block to indicated dedicated bonding */
btm_cb.pairing_flags |= BTM_PAIR_FLAGS_DISC_WHEN_DONE;
if (!l2cu_create_conn_br_edr(p_lcb)) {
LOG(WARNING) << "Security Manager: failed create allocate LCB "
<< p_dev_rec->bd_addr;
l2cu_release_lcb(p_lcb);
return (BTM_NO_RESOURCES);
}
btm_acl_update_busy_level(BTM_BLI_PAGE_EVT);
VLOG(1) << "Security Manager: " << p_dev_rec->bd_addr;
btm_sec_change_pairing_state(BTM_PAIR_STATE_WAIT_PIN_REQ);
return (BTM_CMD_STARTED);
}
bool is_state_getting_name(void* data, void* context) {
tBTM_SEC_DEV_REC* p_dev_rec = static_cast<tBTM_SEC_DEV_REC*>(data);
if (p_dev_rec->sec_state == BTM_SEC_STATE_GETTING_NAME) {
return false;
}
return true;
}
/*******************************************************************************
*
* Function btm_sec_rmt_name_request_complete
*
* Description This function is called when remote name was obtained from
* the peer device
*
* Returns void
*
******************************************************************************/
void btm_sec_rmt_name_request_complete(const RawAddress* p_bd_addr,
uint8_t* p_bd_name, uint8_t status) {
tBTM_SEC_DEV_REC* p_dev_rec;
int i;
DEV_CLASS dev_class;
uint8_t old_sec_state;
BTM_TRACE_EVENT("btm_sec_rmt_name_request_complete");
if ((!p_bd_addr && !BTM_ACL_IS_CONNECTED(btm_cb.connecting_bda)) ||
(p_bd_addr && !BTM_ACL_IS_CONNECTED(*p_bd_addr))) {
btm_acl_resubmit_page();
}
/* If remote name request failed, p_bd_addr is null and we need to search */
/* based on state assuming that we are doing 1 at a time */
if (p_bd_addr)
p_dev_rec = btm_find_dev(*p_bd_addr);
else {
list_node_t* node =
list_foreach(btm_cb.sec_dev_rec, is_state_getting_name, NULL);
if (node != NULL) {
p_dev_rec = static_cast<tBTM_SEC_DEV_REC*>(list_node(node));
p_bd_addr = &p_dev_rec->bd_addr;
} else {
p_dev_rec = NULL;
}
}
/* Commenting out trace due to obf/compilation problems.
*/
if (!p_bd_name) p_bd_name = (uint8_t*)"";
if (p_dev_rec) {
BTM_TRACE_EVENT(
"%s PairState: %s RemName: %s status: %d State:%d p_dev_rec: "
"0x%08x ",
__func__, btm_pair_state_descr(btm_cb.pairing_state), p_bd_name, status,
p_dev_rec->sec_state, p_dev_rec);
} else {
BTM_TRACE_EVENT("%s PairState: %s RemName: %s status: %d", __func__,
btm_pair_state_descr(btm_cb.pairing_state), p_bd_name,
status);
}
if (p_dev_rec) {
old_sec_state = p_dev_rec->sec_state;
if (status == HCI_SUCCESS) {
strlcpy((char*)p_dev_rec->sec_bd_name, (char*)p_bd_name,
BTM_MAX_REM_BD_NAME_LEN);
p_dev_rec->sec_flags |= BTM_SEC_NAME_KNOWN;
BTM_TRACE_EVENT("setting BTM_SEC_NAME_KNOWN sec_flags:0x%x",
p_dev_rec->sec_flags);
} else {
/* Notify all clients waiting for name to be resolved even if it failed so
* clients can continue */
p_dev_rec->sec_bd_name[0] = 0;
}
if (p_dev_rec->sec_state == BTM_SEC_STATE_GETTING_NAME)
p_dev_rec->sec_state = BTM_SEC_STATE_IDLE;
/* Notify all clients waiting for name to be resolved */
for (i = 0; i < BTM_SEC_MAX_RMT_NAME_CALLBACKS; i++) {
if (btm_cb.p_rmt_name_callback[i] && p_bd_addr)
(*btm_cb.p_rmt_name_callback[i])(*p_bd_addr, p_dev_rec->dev_class,
p_dev_rec->sec_bd_name);
}
} else {
dev_class[0] = 0;
dev_class[1] = 0;
dev_class[2] = 0;
/* Notify all clients waiting for name to be resolved even if not found so
* clients can continue */
for (i = 0; i < BTM_SEC_MAX_RMT_NAME_CALLBACKS; i++) {
if (btm_cb.p_rmt_name_callback[i] && p_bd_addr)
(*btm_cb.p_rmt_name_callback[i])(*p_bd_addr, dev_class, (uint8_t*)"");
}
return;
}
/* If we were delaying asking UI for a PIN because name was not resolved, ask
* now */
if ((btm_cb.pairing_state == BTM_PAIR_STATE_WAIT_LOCAL_PIN) && p_bd_addr &&
(btm_cb.pairing_bda == *p_bd_addr)) {
BTM_TRACE_EVENT(
"%s() delayed pin now being requested flags:0x%x, "
"(p_pin_callback=0x%p)",
__func__, btm_cb.pairing_flags, btm_cb.api.p_pin_callback);
if ((btm_cb.pairing_flags & BTM_PAIR_FLAGS_PIN_REQD) == 0 &&
btm_cb.api.p_pin_callback) {
BTM_TRACE_EVENT("%s() calling pin_callback", __func__);
btm_cb.pairing_flags |= BTM_PAIR_FLAGS_PIN_REQD;
(*btm_cb.api.p_pin_callback)(
p_dev_rec->bd_addr, p_dev_rec->dev_class, p_bd_name,
(p_dev_rec->p_cur_service == NULL)
? false
: (p_dev_rec->p_cur_service->security_flags &
BTM_SEC_IN_MIN_16_DIGIT_PIN));
}
/* Set the same state again to force the timer to be restarted */
btm_sec_change_pairing_state(BTM_PAIR_STATE_WAIT_LOCAL_PIN);
return;
}
/* Check if we were delaying bonding because name was not resolved */
if (btm_cb.pairing_state == BTM_PAIR_STATE_GET_REM_NAME) {
if (p_bd_addr && btm_cb.pairing_bda == *p_bd_addr) {
BTM_TRACE_EVENT("%s() continue bonding sm4: 0x%04x, status:0x%x",
__func__, p_dev_rec->sm4, status);
if (btm_cb.pairing_flags & BTM_PAIR_FLAGS_WE_CANCEL_DD) {
btm_sec_bond_cancel_complete();
return;
}
if (status != HCI_SUCCESS) {
btm_sec_change_pairing_state(BTM_PAIR_STATE_IDLE);
if (btm_cb.api.p_auth_complete_callback)
(*btm_cb.api.p_auth_complete_callback)(
p_dev_rec->bd_addr, p_dev_rec->dev_class, p_dev_rec->sec_bd_name,
status);
return;
}
/* if peer is very old legacy devices, HCI_RMT_HOST_SUP_FEAT_NOTIFY_EVT is
* not reported */
if (BTM_SEC_IS_SM4_UNKNOWN(p_dev_rec->sm4)) {
/* set the KNOWN flag only if BTM_PAIR_FLAGS_REJECTED_CONNECT is not
* set.*/
/* If it is set, there may be a race condition */
BTM_TRACE_DEBUG("%s IS_SM4_UNKNOWN Flags:0x%04x", __func__,
btm_cb.pairing_flags);
if ((btm_cb.pairing_flags & BTM_PAIR_FLAGS_REJECTED_CONNECT) == 0)
p_dev_rec->sm4 |= BTM_SM4_KNOWN;
}
BTM_TRACE_DEBUG("%s, SM4 Value: %x, Legacy:%d,IS SM4:%d, Unknown:%d",
__func__, p_dev_rec->sm4,
BTM_SEC_IS_SM4_LEGACY(p_dev_rec->sm4),
BTM_SEC_IS_SM4(p_dev_rec->sm4),
BTM_SEC_IS_SM4_UNKNOWN(p_dev_rec->sm4));
/* BT 2.1 or carkit, bring up the connection to force the peer to request
*PIN.
** Else prefetch (btm_sec_check_prefetch_pin will do the prefetching if
*needed)
*/
if ((p_dev_rec->sm4 != BTM_SM4_KNOWN) ||
!btm_sec_check_prefetch_pin(p_dev_rec)) {
/* if we rejected incoming connection request, we have to wait
* HCI_Connection_Complete event */
/* before originating */
if (btm_cb.pairing_flags & BTM_PAIR_FLAGS_REJECTED_CONNECT) {
BTM_TRACE_WARNING(
"%s: waiting HCI_Connection_Complete after rejecting connection",
__func__);
}
/* Both we and the peer are 2.1 - continue to create connection */
else if (btm_sec_dd_create_conn(p_dev_rec) != BTM_CMD_STARTED) {
BTM_TRACE_WARNING("%s: failed to start connection", __func__);
btm_sec_change_pairing_state(BTM_PAIR_STATE_IDLE);
if (btm_cb.api.p_auth_complete_callback) {
(*btm_cb.api.p_auth_complete_callback)(
p_dev_rec->bd_addr, p_dev_rec->dev_class,
p_dev_rec->sec_bd_name, HCI_ERR_MEMORY_FULL);
}
}
}
return;
} else {
BTM_TRACE_WARNING("%s: wrong BDA, retry with pairing BDA", __func__);
if (BTM_ReadRemoteDeviceName(btm_cb.pairing_bda, NULL,
BT_TRANSPORT_BR_EDR) != BTM_CMD_STARTED) {
BTM_TRACE_ERROR("%s: failed to start remote name request", __func__);
if (btm_cb.api.p_auth_complete_callback) {
(*btm_cb.api.p_auth_complete_callback)(
p_dev_rec->bd_addr, p_dev_rec->dev_class, p_dev_rec->sec_bd_name,
HCI_ERR_MEMORY_FULL);
}
};
return;
}
}
/* check if we were delaying link_key_callback because name was not resolved
*/
if (p_dev_rec->link_key_not_sent) {
/* If HCI connection complete has not arrived, wait for it */
if (p_dev_rec->hci_handle == BTM_SEC_INVALID_HANDLE) return;
p_dev_rec->link_key_not_sent = false;
btm_send_link_key_notif(p_dev_rec);
/* If its not us who perform authentication, we should tell stackserver */
/* that some authentication has been completed */
/* This is required when different entities receive link notification and
* auth complete */
if (!(p_dev_rec->security_required & BTM_SEC_OUT_AUTHENTICATE)) {
if (btm_cb.api.p_auth_complete_callback)
(*btm_cb.api.p_auth_complete_callback)(
p_dev_rec->bd_addr, p_dev_rec->dev_class, p_dev_rec->sec_bd_name,
HCI_SUCCESS);
}
}
/* If this is a bonding procedure can disconnect the link now */
if ((btm_cb.pairing_flags & BTM_PAIR_FLAGS_WE_STARTED_DD) &&
(p_dev_rec->sec_flags & BTM_SEC_AUTHENTICATED)) {
BTM_TRACE_WARNING("btm_sec_rmt_name_request_complete (none/ce)");
p_dev_rec->security_required &= ~(BTM_SEC_OUT_AUTHENTICATE);
l2cu_start_post_bond_timer(p_dev_rec->hci_handle);
return;
}
if (old_sec_state != BTM_SEC_STATE_GETTING_NAME) return;
/* If get name failed, notify the waiting layer */
if (status != HCI_SUCCESS) {
btm_sec_dev_rec_cback_event(p_dev_rec, BTM_ERR_PROCESSING, false);
return;
}
if (p_dev_rec->sm4 & BTM_SM4_REQ_PEND) {
BTM_TRACE_EVENT("waiting for remote features!!");
return;
}
/* Remote Name succeeded, execute the next security procedure, if any */
status = (uint8_t)btm_sec_execute_procedure(p_dev_rec);
/* If result is pending reply from the user or from the device is pending */
if (status == BTM_CMD_STARTED) return;
/* There is no next procedure or start of procedure failed, notify the waiting
* layer */
btm_sec_dev_rec_cback_event(p_dev_rec, status, false);
}
/*******************************************************************************
*
* Function btm_sec_rmt_host_support_feat_evt
*
* Description This function is called when the
* HCI_RMT_HOST_SUP_FEAT_NOTIFY_EVT is received
*
* Returns void
*
******************************************************************************/
void btm_sec_rmt_host_support_feat_evt(uint8_t* p) {
tBTM_SEC_DEV_REC* p_dev_rec;
RawAddress bd_addr; /* peer address */
BD_FEATURES features;
STREAM_TO_BDADDR(bd_addr, p);
p_dev_rec = btm_find_or_alloc_dev(bd_addr);
BTM_TRACE_EVENT("btm_sec_rmt_host_support_feat_evt sm4: 0x%x p[0]: 0x%x",
p_dev_rec->sm4, p[0]);
if (BTM_SEC_IS_SM4_UNKNOWN(p_dev_rec->sm4)) {
p_dev_rec->sm4 = BTM_SM4_KNOWN;
STREAM_TO_ARRAY(features, p, HCI_FEATURE_BYTES_PER_PAGE);
if (HCI_SSP_HOST_SUPPORTED(features)) {
p_dev_rec->sm4 = BTM_SM4_TRUE;
}
BTM_TRACE_EVENT(
"btm_sec_rmt_host_support_feat_evt sm4: 0x%x features[0]: 0x%x",
p_dev_rec->sm4, features[0]);
}
}
/*******************************************************************************
*
* Function btm_io_capabilities_req
*
* Description This function is called when LM request for the IO
* capability of the local device and
* if the OOB data is present for the device in the event
*
* Returns void
*
******************************************************************************/
void btm_io_capabilities_req(const RawAddress& p) {
tBTM_SP_IO_REQ evt_data;
uint8_t err_code = 0;
tBTM_SEC_DEV_REC* p_dev_rec;
bool is_orig = true;
uint8_t callback_rc = BTM_SUCCESS;
evt_data.bd_addr = p;
/* setup the default response according to compile options */
/* assume that the local IO capability does not change
* loc_io_caps is initialized with the default value */
evt_data.io_cap = btm_cb.devcb.loc_io_caps;
evt_data.oob_data = BTM_OOB_NONE;
evt_data.auth_req = BTM_DEFAULT_AUTH_REQ;
BTM_TRACE_EVENT("%s: State: %s", __func__,
btm_pair_state_descr(btm_cb.pairing_state));
p_dev_rec = btm_find_or_alloc_dev(evt_data.bd_addr);
BTM_TRACE_DEBUG("%s:Security mode: %d, Num Read Remote Feat pages: %d",
__func__, btm_cb.security_mode, p_dev_rec->num_read_pages);
if ((btm_cb.security_mode == BTM_SEC_MODE_SC) &&
(p_dev_rec->num_read_pages == 0)) {
BTM_TRACE_EVENT("%s: Device security mode is SC only.",
"To continue need to know remote features.", __func__);
p_dev_rec->remote_features_needed = true;
return;
}
p_dev_rec->sm4 |= BTM_SM4_TRUE;
BTM_TRACE_EVENT("%s: State: %s Flags: 0x%04x p_cur_service: 0x%08x",
__func__, btm_pair_state_descr(btm_cb.pairing_state),
btm_cb.pairing_flags, p_dev_rec->p_cur_service);
if (p_dev_rec->p_cur_service) {
BTM_TRACE_EVENT("%s: cur_service psm: 0x%04x, security_flags: 0x%04x",
__func__, p_dev_rec->p_cur_service->psm,
p_dev_rec->p_cur_service->security_flags);
}
switch (btm_cb.pairing_state) {
/* initiator connecting */
case BTM_PAIR_STATE_IDLE:
// TODO: Handle Idle pairing state
// security_required = p_dev_rec->security_required;
break;
/* received IO capability response already->acceptor */
case BTM_PAIR_STATE_INCOMING_SSP:
is_orig = false;
if (btm_cb.pairing_flags & BTM_PAIR_FLAGS_PEER_STARTED_DD) {
/* acceptor in dedicated bonding */
evt_data.auth_req = BTM_DEFAULT_DD_AUTH_REQ;
}
break;
/* initiator, at this point it is expected to be dedicated bonding
initiated by local device */
case BTM_PAIR_STATE_WAIT_PIN_REQ:
if (evt_data.bd_addr == btm_cb.pairing_bda) {
evt_data.auth_req = BTM_DEFAULT_DD_AUTH_REQ;
} else {
err_code = HCI_ERR_HOST_BUSY_PAIRING;
}
break;
/* any other state is unexpected */
default:
err_code = HCI_ERR_HOST_BUSY_PAIRING;
BTM_TRACE_ERROR("%s: Unexpected Pairing state received %d", __func__,
btm_cb.pairing_state);
break;
}
if (btm_cb.pairing_disabled) {
/* pairing is not allowed */
BTM_TRACE_DEBUG("%s: Pairing is not allowed -> fail pairing.", __func__);
err_code = HCI_ERR_PAIRING_NOT_ALLOWED;
} else if (btm_cb.security_mode == BTM_SEC_MODE_SC) {
bool local_supports_sc =
controller_get_interface()->supports_secure_connections();
/* device in Secure Connections Only mode */
if (!(local_supports_sc) ||
!(p_dev_rec->remote_supports_secure_connections)) {
BTM_TRACE_DEBUG("%s: SC only service, local_support_for_sc %d,",
" remote_support_for_sc 0x%02x -> fail pairing", __func__,
local_supports_sc,
p_dev_rec->remote_supports_secure_connections);
err_code = HCI_ERR_PAIRING_NOT_ALLOWED;
}
}
if (err_code != 0) {
btsnd_hcic_io_cap_req_neg_reply(evt_data.bd_addr, err_code);
return;
}
evt_data.is_orig = is_orig;
if (is_orig) {
/* local device initiated the pairing non-bonding -> use p_cur_service */
if (!(btm_cb.pairing_flags & BTM_PAIR_FLAGS_WE_STARTED_DD) &&
p_dev_rec->p_cur_service &&
(p_dev_rec->p_cur_service->security_flags & BTM_SEC_OUT_AUTHENTICATE)) {
if (btm_cb.security_mode == BTM_SEC_MODE_SC) {
/* SC only mode device requires MITM protection */
evt_data.auth_req = BTM_AUTH_SP_YES;
} else {
evt_data.auth_req =
(p_dev_rec->p_cur_service->security_flags & BTM_SEC_OUT_MITM)
? BTM_AUTH_SP_YES
: BTM_AUTH_SP_NO;
}
}
}
/* Notify L2CAP to increase timeout */
l2c_pin_code_request(evt_data.bd_addr);
btm_cb.pairing_bda = evt_data.bd_addr;
if (evt_data.bd_addr == btm_cb.connecting_bda)
memcpy(p_dev_rec->dev_class, btm_cb.connecting_dc, DEV_CLASS_LEN);
btm_sec_change_pairing_state(BTM_PAIR_STATE_WAIT_LOCAL_IOCAPS);
callback_rc = BTM_SUCCESS;
if (p_dev_rec->sm4 & BTM_SM4_UPGRADE) {
p_dev_rec->sm4 &= ~BTM_SM4_UPGRADE;
/* link key upgrade: always use SPGB_YES - assuming we want to save the link
* key */
evt_data.auth_req = BTM_AUTH_SPGB_YES;
} else if (btm_cb.api.p_sp_callback) {
/* the callback function implementation may change the IO capability... */
callback_rc = (*btm_cb.api.p_sp_callback)(BTM_SP_IO_REQ_EVT,
(tBTM_SP_EVT_DATA*)&evt_data);
}
if ((callback_rc == BTM_SUCCESS) || (BTM_OOB_UNKNOWN != evt_data.oob_data)) {
if ((btm_cb.pairing_flags & BTM_PAIR_FLAGS_WE_STARTED_DD)) {
evt_data.auth_req =
(BTM_AUTH_DD_BOND | (evt_data.auth_req & BTM_AUTH_YN_BIT));
}
if (btm_cb.security_mode == BTM_SEC_MODE_SC) {
/* At this moment we know that both sides are SC capable, device in */
/* SC only mode requires MITM for any service so let's set MITM bit */
evt_data.auth_req |= BTM_AUTH_YN_BIT;
BTM_TRACE_DEBUG(
"%s: for device in \"SC only\" mode set auth_req to 0x%02x", __func__,
evt_data.auth_req);
}
/* if the user does not indicate "reply later" by setting the oob_data to
* unknown */
/* send the response right now. Save the current IO capability in the
* control block */
btm_cb.devcb.loc_auth_req = evt_data.auth_req;
btm_cb.devcb.loc_io_caps = evt_data.io_cap;
BTM_TRACE_EVENT("%s: State: %s IO_CAP:%d oob_data:%d auth_req:%d",
__func__, btm_pair_state_descr(btm_cb.pairing_state),
evt_data.io_cap, evt_data.oob_data, evt_data.auth_req);
btsnd_hcic_io_cap_req_reply(evt_data.bd_addr, evt_data.io_cap,
evt_data.oob_data, evt_data.auth_req);
}
}
/*******************************************************************************
*
* Function btm_io_capabilities_rsp
*
* Description This function is called when the IO capability of the
* specified device is received
*
* Returns void
*
******************************************************************************/
void btm_io_capabilities_rsp(uint8_t* p) {
tBTM_SEC_DEV_REC* p_dev_rec;
tBTM_SP_IO_RSP evt_data;
STREAM_TO_BDADDR(evt_data.bd_addr, p);
STREAM_TO_UINT8(evt_data.io_cap, p);
STREAM_TO_UINT8(evt_data.oob_data, p);
STREAM_TO_UINT8(evt_data.auth_req, p);
/* Allocate a new device record or reuse the oldest one */
p_dev_rec = btm_find_or_alloc_dev(evt_data.bd_addr);
/* If no security is in progress, this indicates incoming security */
if (btm_cb.pairing_state == BTM_PAIR_STATE_IDLE) {
btm_cb.pairing_bda = evt_data.bd_addr;
btm_sec_change_pairing_state(BTM_PAIR_STATE_INCOMING_SSP);
/* Make sure we reset the trusted mask to help against attacks */
BTM_SEC_CLR_TRUSTED_DEVICE(p_dev_rec->trusted_mask);
/* work around for FW bug */
btm_inq_stop_on_ssp();
}
/* Notify L2CAP to increase timeout */
l2c_pin_code_request(evt_data.bd_addr);
/* We must have a device record here.
* Use the connecting device's CoD for the connection */
if (evt_data.bd_addr == btm_cb.connecting_bda)
memcpy(p_dev_rec->dev_class, btm_cb.connecting_dc, DEV_CLASS_LEN);
/* peer sets dedicated bonding bit and we did not initiate dedicated bonding
*/
if (btm_cb.pairing_state ==
BTM_PAIR_STATE_INCOMING_SSP /* peer initiated bonding */
&& (evt_data.auth_req &
BTM_AUTH_DD_BOND)) /* and dedicated bonding bit is set */
{
btm_cb.pairing_flags |= BTM_PAIR_FLAGS_PEER_STARTED_DD;
}
/* save the IO capability in the device record */
p_dev_rec->rmt_io_caps = evt_data.io_cap;
p_dev_rec->rmt_auth_req = evt_data.auth_req;
if (btm_cb.api.p_sp_callback)
(*btm_cb.api.p_sp_callback)(BTM_SP_IO_RSP_EVT,
(tBTM_SP_EVT_DATA*)&evt_data);
}
/*******************************************************************************
*
* Function btm_proc_sp_req_evt
*
* Description This function is called to process/report
* HCI_USER_CONFIRMATION_REQUEST_EVT
* or HCI_USER_PASSKEY_REQUEST_EVT
* or HCI_USER_PASSKEY_NOTIFY_EVT
*
* Returns void
*
******************************************************************************/
void btm_proc_sp_req_evt(tBTM_SP_EVT event, uint8_t* p) {
tBTM_STATUS status = BTM_ERR_PROCESSING;
tBTM_SP_EVT_DATA evt_data;
RawAddress& p_bda = evt_data.cfm_req.bd_addr;
tBTM_SEC_DEV_REC* p_dev_rec;
/* All events start with bd_addr */
STREAM_TO_BDADDR(p_bda, p);
VLOG(2) << " BDA: " << p_bda << " event: 0x" << std::hex << +event
<< " State: " << btm_pair_state_descr(btm_cb.pairing_state);
p_dev_rec = btm_find_dev(p_bda);
if ((p_dev_rec != NULL) && (btm_cb.pairing_state != BTM_PAIR_STATE_IDLE) &&
(btm_cb.pairing_bda == p_bda)) {
evt_data.cfm_req.bd_addr = p_dev_rec->bd_addr;
memcpy(evt_data.cfm_req.dev_class, p_dev_rec->dev_class, DEV_CLASS_LEN);
strlcpy((char*)evt_data.cfm_req.bd_name, (char*)p_dev_rec->sec_bd_name,
BTM_MAX_REM_BD_NAME_LEN);
switch (event) {
case BTM_SP_CFM_REQ_EVT:
/* Numeric confirmation. Need user to conf the passkey */
btm_sec_change_pairing_state(BTM_PAIR_STATE_WAIT_NUMERIC_CONFIRM);
/* The device record must be allocated in the "IO cap exchange" step */
STREAM_TO_UINT32(evt_data.cfm_req.num_val, p);
BTM_TRACE_DEBUG("BTM_SP_CFM_REQ_EVT: num_val: %u",
evt_data.cfm_req.num_val);
evt_data.cfm_req.just_works = true;
/* process user confirm req in association with the auth_req param */
if (btm_cb.devcb.loc_io_caps == BTM_IO_CAP_IO) {
if (p_dev_rec->rmt_io_caps == BTM_IO_CAP_UNKNOWN) {
BTM_TRACE_ERROR(
"%s did not receive IO cap response prior"
" to BTM_SP_CFM_REQ_EVT, failing pairing request",
__func__);
status = BTM_WRONG_MODE;
BTM_ConfirmReqReply(status, p_bda);
return;
}
if ((p_dev_rec->rmt_io_caps == BTM_IO_CAP_IO) &&
(btm_cb.devcb.loc_io_caps == BTM_IO_CAP_IO) &&
((p_dev_rec->rmt_auth_req & BTM_AUTH_SP_YES) ||
(btm_cb.devcb.loc_auth_req & BTM_AUTH_SP_YES))) {
/* Both devices are DisplayYesNo and one or both devices want to
authenticate -> use authenticated link key */
evt_data.cfm_req.just_works = false;
}
}
BTM_TRACE_DEBUG(
"btm_proc_sp_req_evt() just_works:%d, io loc:%d, rmt:%d, auth "
"loc:%d, rmt:%d",
evt_data.cfm_req.just_works, btm_cb.devcb.loc_io_caps,
p_dev_rec->rmt_io_caps, btm_cb.devcb.loc_auth_req,
p_dev_rec->rmt_auth_req);
evt_data.cfm_req.loc_auth_req = btm_cb.devcb.loc_auth_req;
evt_data.cfm_req.rmt_auth_req = p_dev_rec->rmt_auth_req;
evt_data.cfm_req.loc_io_caps = btm_cb.devcb.loc_io_caps;
evt_data.cfm_req.rmt_io_caps = p_dev_rec->rmt_io_caps;
break;
case BTM_SP_KEY_NOTIF_EVT:
/* Passkey notification (other side is a keyboard) */
STREAM_TO_UINT32(evt_data.key_notif.passkey, p);
BTM_TRACE_DEBUG("BTM_SP_KEY_NOTIF_EVT: passkey: %u",
evt_data.key_notif.passkey);
btm_sec_change_pairing_state(BTM_PAIR_STATE_WAIT_AUTH_COMPLETE);
break;
case BTM_SP_KEY_REQ_EVT:
if (btm_cb.devcb.loc_io_caps != BTM_IO_CAP_NONE) {
/* HCI_USER_PASSKEY_REQUEST_EVT */
btm_sec_change_pairing_state(BTM_PAIR_STATE_KEY_ENTRY);
}
break;
}
if (btm_cb.api.p_sp_callback) {
status = (*btm_cb.api.p_sp_callback)(event, &evt_data);
if (status != BTM_NOT_AUTHORIZED) {
return;
}
/* else BTM_NOT_AUTHORIZED means when the app wants to reject the req
* right now */
} else if ((event == BTM_SP_CFM_REQ_EVT) && (evt_data.cfm_req.just_works)) {
/* automatically reply with just works if no sp_cback */
status = BTM_SUCCESS;
}
if (event == BTM_SP_CFM_REQ_EVT) {
BTM_TRACE_DEBUG("calling BTM_ConfirmReqReply with status: %d", status);
BTM_ConfirmReqReply(status, p_bda);
} else if (btm_cb.devcb.loc_io_caps != BTM_IO_CAP_NONE &&
event == BTM_SP_KEY_REQ_EVT) {
BTM_PasskeyReqReply(status, p_bda, 0);
}
return;
}
/* Something bad. we can only fail this connection */
btm_cb.acl_disc_reason = HCI_ERR_HOST_REJECT_SECURITY;
if (BTM_SP_CFM_REQ_EVT == event) {
btsnd_hcic_user_conf_reply(p_bda, false);
} else if (BTM_SP_KEY_NOTIF_EVT == event) {
/* do nothing -> it very unlikely to happen.
This event is most likely to be received by a HID host when it first
connects to a HID device.
Usually the Host initiated the connection in this case.
On Mobile platforms, if there's a security process happening,
the host probably can not initiate another connection.
BTW (PC) is another story. */
p_dev_rec = btm_find_dev(p_bda);
if (p_dev_rec != NULL) {
btm_sec_disconnect(p_dev_rec->hci_handle, HCI_ERR_AUTH_FAILURE);
}
} else if (btm_cb.devcb.loc_io_caps != BTM_IO_CAP_NONE) {
btsnd_hcic_user_passkey_neg_reply(p_bda);
}
}
/*******************************************************************************
*
* Function btm_keypress_notif_evt
*
* Description This function is called when a key press notification is
* received
*
* Returns void
*
******************************************************************************/
void btm_keypress_notif_evt(uint8_t* p) {
tBTM_SP_KEYPRESS evt_data;
/* parse & report BTM_SP_KEYPRESS_EVT */
if (btm_cb.api.p_sp_callback) {
RawAddress& p_bda = evt_data.bd_addr;
STREAM_TO_BDADDR(p_bda, p);
evt_data.notif_type = *p;
(*btm_cb.api.p_sp_callback)(BTM_SP_KEYPRESS_EVT,
(tBTM_SP_EVT_DATA*)&evt_data);
}
}
/*******************************************************************************
*
* Function btm_simple_pair_complete
*
* Description This function is called when simple pairing process is
* complete
*
* Returns void
*
******************************************************************************/
void btm_simple_pair_complete(uint8_t* p) {
tBTM_SP_COMPLT evt_data;
tBTM_SEC_DEV_REC* p_dev_rec;
uint8_t status;
bool disc = false;
status = *p++;
STREAM_TO_BDADDR(evt_data.bd_addr, p);
p_dev_rec = btm_find_dev(evt_data.bd_addr);
if (p_dev_rec == NULL) {
LOG(ERROR) << __func__ << " with unknown BDA: " << evt_data.bd_addr;
return;
}
BTM_TRACE_EVENT(
"btm_simple_pair_complete() Pair State: %s Status:%d sec_state: %u",
btm_pair_state_descr(btm_cb.pairing_state), status, p_dev_rec->sec_state);
evt_data.status = BTM_ERR_PROCESSING;
if (status == HCI_SUCCESS) {
evt_data.status = BTM_SUCCESS;
p_dev_rec->sec_flags |= BTM_SEC_AUTHENTICATED;
} else {
if (status == HCI_ERR_PAIRING_NOT_ALLOWED) {
/* The test spec wants the peer device to get this failure code. */
btm_sec_change_pairing_state(BTM_PAIR_STATE_WAIT_DISCONNECT);
/* Change the timer to 1 second */
alarm_set_on_mloop(btm_cb.pairing_timer, BT_1SEC_TIMEOUT_MS,
btm_sec_pairing_timeout, NULL);
} else if (btm_cb.pairing_bda == evt_data.bd_addr) {
/* stop the timer */
alarm_cancel(btm_cb.pairing_timer);
if (p_dev_rec->sec_state != BTM_SEC_STATE_AUTHENTICATING) {
/* the initiating side: will receive auth complete event. disconnect ACL
* at that time */
disc = true;
}
} else
disc = true;
}
/* Let the pairing state stay active, p_auth_complete_callback will report the
* failure */
evt_data.bd_addr = p_dev_rec->bd_addr;
memcpy(evt_data.dev_class, p_dev_rec->dev_class, DEV_CLASS_LEN);
if (btm_cb.api.p_sp_callback)
(*btm_cb.api.p_sp_callback)(BTM_SP_COMPLT_EVT,
(tBTM_SP_EVT_DATA*)&evt_data);
if (disc) {
/* simple pairing failed */
/* Avoid sending disconnect on HCI_ERR_PEER_USER */
if ((status != HCI_ERR_PEER_USER) &&
(status != HCI_ERR_CONN_CAUSE_LOCAL_HOST)) {
btm_sec_send_hci_disconnect(p_dev_rec, HCI_ERR_AUTH_FAILURE,
p_dev_rec->hci_handle);
}
}
}
/*******************************************************************************
*
* Function btm_rem_oob_req
*
* Description This function is called to process/report
* HCI_REMOTE_OOB_DATA_REQUEST_EVT
*
* Returns void
*
******************************************************************************/
void btm_rem_oob_req(uint8_t* p) {
tBTM_SP_RMT_OOB evt_data;
tBTM_SEC_DEV_REC* p_dev_rec;
Octet16 c;
Octet16 r;
RawAddress& p_bda = evt_data.bd_addr;
STREAM_TO_BDADDR(p_bda, p);
VLOG(2) << __func__ << " BDA: " << p_bda;
p_dev_rec = btm_find_dev(p_bda);
if ((p_dev_rec != NULL) && btm_cb.api.p_sp_callback) {
evt_data.bd_addr = p_dev_rec->bd_addr;
memcpy(evt_data.dev_class, p_dev_rec->dev_class, DEV_CLASS_LEN);
strlcpy((char*)evt_data.bd_name, (char*)p_dev_rec->sec_bd_name,
BTM_MAX_REM_BD_NAME_LEN);
btm_sec_change_pairing_state(BTM_PAIR_STATE_WAIT_LOCAL_OOB_RSP);
if ((*btm_cb.api.p_sp_callback)(BTM_SP_RMT_OOB_EVT,
(tBTM_SP_EVT_DATA*)&evt_data) ==
BTM_NOT_AUTHORIZED) {
BTM_RemoteOobDataReply(true, p_bda, c, r);
}
return;
}
/* something bad. we can only fail this connection */
btm_cb.acl_disc_reason = HCI_ERR_HOST_REJECT_SECURITY;
btsnd_hcic_rem_oob_neg_reply(p_bda);
}
/*******************************************************************************
*
* Function btm_read_local_oob_complete
*
* Description This function is called when read local oob data is
* completed by the LM
*
* Returns void
*
******************************************************************************/
void btm_read_local_oob_complete(uint8_t* p) {
tBTM_SP_LOC_OOB evt_data;
uint8_t status = *p++;
BTM_TRACE_EVENT("btm_read_local_oob_complete:%d", status);
if (status == HCI_SUCCESS) {
evt_data.status = BTM_SUCCESS;
STREAM_TO_ARRAY16(evt_data.c.data(), p);
STREAM_TO_ARRAY16(evt_data.r.data(), p);
} else
evt_data.status = BTM_ERR_PROCESSING;
if (btm_cb.api.p_sp_callback) {
tBTM_SP_EVT_DATA btm_sp_evt_data;
btm_sp_evt_data.loc_oob = evt_data;
(*btm_cb.api.p_sp_callback)(BTM_SP_LOC_OOB_EVT, &btm_sp_evt_data);
}
}
/*******************************************************************************
*
* Function btm_sec_auth_collision
*
* Description This function is called when authentication or encryption
* needs to be retried at a later time.
*
* Returns void
*
******************************************************************************/
static void btm_sec_auth_collision(uint16_t handle) {
tBTM_SEC_DEV_REC* p_dev_rec;
if (!btm_cb.collision_start_time)
btm_cb.collision_start_time = bluetooth::common::time_get_os_boottime_ms();
if ((bluetooth::common::time_get_os_boottime_ms() -
btm_cb.collision_start_time) < BTM_SEC_MAX_COLLISION_DELAY) {
if (handle == BTM_SEC_INVALID_HANDLE) {
p_dev_rec = btm_sec_find_dev_by_sec_state(BTM_SEC_STATE_AUTHENTICATING);
if (p_dev_rec == NULL)
p_dev_rec = btm_sec_find_dev_by_sec_state(BTM_SEC_STATE_ENCRYPTING);
} else
p_dev_rec = btm_find_dev_by_handle(handle);
if (p_dev_rec != NULL) {
BTM_TRACE_DEBUG(
"btm_sec_auth_collision: state %d (retrying in a moment...)",
p_dev_rec->sec_state);
/* We will restart authentication after timeout */
if (p_dev_rec->sec_state == BTM_SEC_STATE_AUTHENTICATING ||
p_dev_rec->sec_state == BTM_SEC_STATE_ENCRYPTING)
p_dev_rec->sec_state = 0;
btm_cb.p_collided_dev_rec = p_dev_rec;
alarm_set_on_mloop(btm_cb.sec_collision_timer, BT_1SEC_TIMEOUT_MS,
btm_sec_collision_timeout, NULL);
}
}
}
/******************************************************************************
*
* Function btm_sec_auth_retry
*
* Description This function is called when authentication or encryption
* needs to be retried at a later time.
*
* Returns TRUE if a security retry required
*
*****************************************************************************/
static bool btm_sec_auth_retry(uint16_t handle, uint8_t status) {
tBTM_SEC_DEV_REC* p_dev_rec = btm_find_dev_by_handle(handle);
if (!p_dev_rec) return false;
/* keep the old sm4 flag and clear the retry bit in control block */
uint8_t old_sm4 = p_dev_rec->sm4;
p_dev_rec->sm4 &= ~BTM_SM4_RETRY;
if ((btm_cb.pairing_state == BTM_PAIR_STATE_IDLE) &&
((old_sm4 & BTM_SM4_RETRY) == 0) && (HCI_ERR_KEY_MISSING == status) &&
BTM_SEC_IS_SM4(p_dev_rec->sm4)) {
/* This retry for missing key is for Lisbon or later only.
Legacy device do not need this. the controller will drive the retry
automatically
set the retry bit */
btm_cb.collision_start_time = 0;
btm_restore_mode();
p_dev_rec->sm4 |= BTM_SM4_RETRY;
p_dev_rec->sec_flags &= ~BTM_SEC_LINK_KEY_KNOWN;
BTM_TRACE_DEBUG("%s Retry for missing key sm4:x%x sec_flags:0x%x", __func__,
p_dev_rec->sm4, p_dev_rec->sec_flags);
/* With BRCM controller, we do not need to delete the stored link key in
controller.
If the stack may sit on top of other controller, we may need this
BTM_DeleteStoredLinkKey (bd_addr, NULL); */
p_dev_rec->sec_state = BTM_SEC_STATE_IDLE;
btm_sec_execute_procedure(p_dev_rec);
return true;
}
return false;
}
/*******************************************************************************
*
* Function btm_sec_auth_complete
*
* Description This function is when authentication of the connection is
* completed by the LM
*
* Returns void
*
******************************************************************************/
void btm_sec_auth_complete(uint16_t handle, uint8_t status) {
tBTM_PAIRING_STATE old_state = btm_cb.pairing_state;
tBTM_SEC_DEV_REC* p_dev_rec = btm_find_dev_by_handle(handle);
bool are_bonding = false;
bool was_authenticating = false;
if (p_dev_rec) {
VLOG(2) << __func__ << ": Security Manager: in state: "
<< btm_pair_state_descr(btm_cb.pairing_state)
<< " handle:" << handle << " status:" << status
<< "dev->sec_state:" << p_dev_rec->sec_state
<< " bda:" << p_dev_rec->bd_addr
<< "RName:" << p_dev_rec->sec_bd_name;
} else {
VLOG(2) << __func__ << ": Security Manager: in state: "
<< btm_pair_state_descr(btm_cb.pairing_state)
<< " handle:" << handle << " status:" << status;
}
/* For transaction collision we need to wait and repeat. There is no need */
/* for random timeout because only slave should receive the result */
if ((status == HCI_ERR_LMP_ERR_TRANS_COLLISION) ||
(status == HCI_ERR_DIFF_TRANSACTION_COLLISION)) {
btm_sec_auth_collision(handle);
return;
} else if (btm_sec_auth_retry(handle, status)) {
return;
}
btm_cb.collision_start_time = 0;
btm_restore_mode();
/* Check if connection was made just to do bonding. If we authenticate
the connection that is up, this is the last event received.
*/
if (p_dev_rec && (btm_cb.pairing_flags & BTM_PAIR_FLAGS_WE_STARTED_DD) &&
!(btm_cb.pairing_flags & BTM_PAIR_FLAGS_DISC_WHEN_DONE)) {
p_dev_rec->security_required &= ~BTM_SEC_OUT_AUTHENTICATE;
l2cu_start_post_bond_timer(p_dev_rec->hci_handle);
}
if (!p_dev_rec) return;
if (p_dev_rec->sec_state == BTM_SEC_STATE_AUTHENTICATING) {
p_dev_rec->sec_state = BTM_SEC_STATE_IDLE;
was_authenticating = true;
/* There can be a race condition, when we are starting authentication
* and the peer device is doing encryption.
* If first we receive encryption change up, then initiated
* authentication can not be performed.
* According to the spec we can not do authentication on the
* encrypted link, so device is correct.
*/
if ((status == HCI_ERR_COMMAND_DISALLOWED) &&
((p_dev_rec->sec_flags & (BTM_SEC_AUTHENTICATED | BTM_SEC_ENCRYPTED)) ==
(BTM_SEC_AUTHENTICATED | BTM_SEC_ENCRYPTED))) {
status = HCI_SUCCESS;
}
if (status == HCI_SUCCESS) {
p_dev_rec->sec_flags |= BTM_SEC_AUTHENTICATED;
}
}
if ((btm_cb.pairing_state != BTM_PAIR_STATE_IDLE) &&
(p_dev_rec->bd_addr == btm_cb.pairing_bda)) {
if (btm_cb.pairing_flags & BTM_PAIR_FLAGS_WE_STARTED_DD) {
are_bonding = true;
}
btm_sec_change_pairing_state(BTM_PAIR_STATE_IDLE);
}
if (was_authenticating == false) {
if ((btm_cb.api.p_auth_complete_callback && status != HCI_SUCCESS) &&
(old_state != BTM_PAIR_STATE_IDLE)) {
(*btm_cb.api.p_auth_complete_callback)(p_dev_rec->bd_addr,
p_dev_rec->dev_class,
p_dev_rec->sec_bd_name, status);
}
return;
}
/* Currently we do not notify user if it is a keyboard which connects */
/* User probably Disabled the keyboard while it was asleap. Let her try */
if (btm_cb.api.p_auth_complete_callback) {
/* report the suthentication status */
if ((old_state != BTM_PAIR_STATE_IDLE) || (status != HCI_SUCCESS))
(*btm_cb.api.p_auth_complete_callback)(p_dev_rec->bd_addr,
p_dev_rec->dev_class,
p_dev_rec->sec_bd_name, status);
}
/* If this is a bonding procedure can disconnect the link now */
if (are_bonding) {
p_dev_rec->security_required &= ~BTM_SEC_OUT_AUTHENTICATE;
if (status != HCI_SUCCESS) {
if (((status != HCI_ERR_PEER_USER) &&
(status != HCI_ERR_CONN_CAUSE_LOCAL_HOST)))
btm_sec_send_hci_disconnect(p_dev_rec, HCI_ERR_PEER_USER,
p_dev_rec->hci_handle);
} else {
BTM_TRACE_DEBUG("TRYING TO DECIDE IF CAN USE SMP_BR_CHNL");
if (p_dev_rec->new_encryption_key_is_p256 &&
(btm_sec_use_smp_br_chnl(p_dev_rec))
/* no LE keys are available, do deriving */
&& (!(p_dev_rec->sec_flags & BTM_SEC_LE_LINK_KEY_KNOWN) ||
/* or BR key is higher security than existing LE keys */
(!(p_dev_rec->sec_flags & BTM_SEC_LE_LINK_KEY_AUTHED) &&
(p_dev_rec->sec_flags & BTM_SEC_LINK_KEY_AUTHED)))) {
BTM_TRACE_DEBUG(
"link encrypted afer dedic bonding can use SMP_BR_CHNL");
if (btm_sec_is_master(p_dev_rec)) {
// Encryption is required to start SM over BR/EDR
// indicate that this is encryption after authentication
BTM_SetEncryption(p_dev_rec->bd_addr, BT_TRANSPORT_BR_EDR, NULL, NULL,
0);
}
}
l2cu_start_post_bond_timer(p_dev_rec->hci_handle);
}
return;
}
/* If authentication failed, notify the waiting layer */
if (status != HCI_SUCCESS) {
btm_sec_dev_rec_cback_event(p_dev_rec, BTM_ERR_PROCESSING, false);
if (btm_cb.pairing_flags & BTM_PAIR_FLAGS_DISC_WHEN_DONE) {
btm_sec_send_hci_disconnect(p_dev_rec, HCI_ERR_AUTH_FAILURE,
p_dev_rec->hci_handle);
}
return;
}
if (p_dev_rec->pin_code_length >= 16 ||
p_dev_rec->link_key_type == BTM_LKEY_TYPE_AUTH_COMB ||
p_dev_rec->link_key_type == BTM_LKEY_TYPE_AUTH_COMB_P_256) {
// If we have MITM protection we have a higher level of security than
// provided by 16 digits PIN
p_dev_rec->sec_flags |= BTM_SEC_16_DIGIT_PIN_AUTHED;
}
/* Authentication succeeded, execute the next security procedure, if any */
status = btm_sec_execute_procedure(p_dev_rec);
/* If there is no next procedure, or procedure failed to start, notify the
* caller */
if (status != BTM_CMD_STARTED)
btm_sec_dev_rec_cback_event(p_dev_rec, status, false);
}
/*******************************************************************************
*
* Function btm_sec_encrypt_change
*
* Description This function is when encryption of the connection is
* completed by the LM
*
* Returns void
*
******************************************************************************/
void btm_sec_encrypt_change(uint16_t handle, uint8_t status,
uint8_t encr_enable) {
tBTM_SEC_DEV_REC* p_dev_rec = btm_find_dev_by_handle(handle);
tACL_CONN* p_acl = NULL;
uint8_t acl_idx = btm_handle_to_acl_index(handle);
BTM_TRACE_EVENT(
"Security Manager: encrypt_change status:%d State:%d, encr_enable = %d",
status, (p_dev_rec) ? p_dev_rec->sec_state : 0, encr_enable);
BTM_TRACE_DEBUG("before update p_dev_rec->sec_flags=0x%x",
(p_dev_rec) ? p_dev_rec->sec_flags : 0);
/* For transaction collision we need to wait and repeat. There is no need */
/* for random timeout because only slave should receive the result */
if ((status == HCI_ERR_LMP_ERR_TRANS_COLLISION) ||
(status == HCI_ERR_DIFF_TRANSACTION_COLLISION)) {
btm_sec_auth_collision(handle);
return;
}
btm_cb.collision_start_time = 0;
if (!p_dev_rec) return;
if ((status == HCI_SUCCESS) && encr_enable) {
if (p_dev_rec->hci_handle == handle) {
p_dev_rec->sec_flags |= (BTM_SEC_AUTHENTICATED | BTM_SEC_ENCRYPTED);
if (p_dev_rec->pin_code_length >= 16 ||
p_dev_rec->link_key_type == BTM_LKEY_TYPE_AUTH_COMB ||
p_dev_rec->link_key_type == BTM_LKEY_TYPE_AUTH_COMB_P_256) {
p_dev_rec->sec_flags |= BTM_SEC_16_DIGIT_PIN_AUTHED;
}
} else {
p_dev_rec->sec_flags |= (BTM_SEC_LE_AUTHENTICATED | BTM_SEC_LE_ENCRYPTED);
}
}
/* It is possible that we decrypted the link to perform role switch */
/* mark link not to be encrypted, so that when we execute security next time
* it will kick in again */
if ((status == HCI_SUCCESS) && !encr_enable) {
if (p_dev_rec->hci_handle == handle)
p_dev_rec->sec_flags &= ~BTM_SEC_ENCRYPTED;
else
p_dev_rec->sec_flags &= ~BTM_SEC_LE_ENCRYPTED;
}
BTM_TRACE_DEBUG("after update p_dev_rec->sec_flags=0x%x",
p_dev_rec->sec_flags);
if (acl_idx != MAX_L2CAP_LINKS) p_acl = &btm_cb.acl_db[acl_idx];
if (p_acl != NULL)
btm_sec_check_pending_enc_req(p_dev_rec, p_acl->transport, encr_enable);
if (p_acl && p_acl->transport == BT_TRANSPORT_LE) {
if (status == HCI_ERR_KEY_MISSING || status == HCI_ERR_AUTH_FAILURE ||
status == HCI_ERR_ENCRY_MODE_NOT_ACCEPTABLE) {
p_dev_rec->sec_flags &= ~(BTM_SEC_LE_LINK_KEY_KNOWN);
p_dev_rec->ble.key_type = BTM_LE_KEY_NONE;
}
btm_ble_link_encrypted(p_dev_rec->ble.pseudo_addr, encr_enable);
return;
} else {
/* BR/EDR connection, update the encryption key size to be 16 as always */
p_dev_rec->enc_key_size = 16;
}
BTM_TRACE_DEBUG("in %s new_encr_key_256 is %d", __func__,
p_dev_rec->new_encryption_key_is_p256);
if ((status == HCI_SUCCESS) && encr_enable &&
(p_dev_rec->hci_handle == handle)) {
/* if BR key is temporary no need for LE LTK derivation */
bool derive_ltk = true;
if (p_dev_rec->rmt_auth_req == BTM_AUTH_SP_NO &&
btm_cb.devcb.loc_auth_req == BTM_AUTH_SP_NO) {
derive_ltk = false;
BTM_TRACE_DEBUG("%s: BR key is temporary, skip derivation of LE LTK",
__func__);
}
if (p_dev_rec->new_encryption_key_is_p256) {
if (btm_sec_use_smp_br_chnl(p_dev_rec) && btm_sec_is_master(p_dev_rec) &&
/* if LE key is not known, do deriving */
(!(p_dev_rec->sec_flags & BTM_SEC_LE_LINK_KEY_KNOWN) ||
/* or BR key is higher security than existing LE keys */
(!(p_dev_rec->sec_flags & BTM_SEC_LE_LINK_KEY_AUTHED) &&
(p_dev_rec->sec_flags & BTM_SEC_LINK_KEY_AUTHED))) &&
derive_ltk) {
/* BR/EDR is encrypted with LK that can be used to derive LE LTK */
p_dev_rec->new_encryption_key_is_p256 = false;
if (p_dev_rec->no_smp_on_br) {
BTM_TRACE_DEBUG("%s NO SM over BR/EDR", __func__);
} else {
BTM_TRACE_DEBUG("%s start SM over BR/EDR", __func__);
SMP_BR_PairWith(p_dev_rec->bd_addr);
}
}
} else {
// BR/EDR is successfully encrypted. Correct LK type if needed
// (BR/EDR LK derived from LE LTK was used for encryption)
if ((encr_enable == 1) && /* encryption is ON for SSP */
/* LK type is for BR/EDR SC */
(p_dev_rec->link_key_type == BTM_LKEY_TYPE_UNAUTH_COMB_P_256 ||
p_dev_rec->link_key_type == BTM_LKEY_TYPE_AUTH_COMB_P_256)) {
if (p_dev_rec->link_key_type == BTM_LKEY_TYPE_UNAUTH_COMB_P_256)
p_dev_rec->link_key_type = BTM_LKEY_TYPE_UNAUTH_COMB;
else /* BTM_LKEY_TYPE_AUTH_COMB_P_256 */
p_dev_rec->link_key_type = BTM_LKEY_TYPE_AUTH_COMB;
BTM_TRACE_DEBUG("updated link key type to %d",
p_dev_rec->link_key_type);
btm_send_link_key_notif(p_dev_rec);
}
}
}
/* If this encryption was started by peer do not need to do anything */
if (p_dev_rec->sec_state != BTM_SEC_STATE_ENCRYPTING) {
if (BTM_SEC_STATE_DELAY_FOR_ENC == p_dev_rec->sec_state) {
p_dev_rec->sec_state = BTM_SEC_STATE_IDLE;
BTM_TRACE_DEBUG("%s: clearing callback. p_dev_rec=%p, p_callback=%p",
__func__, p_dev_rec, p_dev_rec->p_callback);
p_dev_rec->p_callback = NULL;
l2cu_resubmit_pending_sec_req(&p_dev_rec->bd_addr);
}
return;
}
p_dev_rec->sec_state = BTM_SEC_STATE_IDLE;
/* If encryption setup failed, notify the waiting layer */
if (status != HCI_SUCCESS) {
btm_sec_dev_rec_cback_event(p_dev_rec, BTM_ERR_PROCESSING, false);
return;
}
/* Encryption setup succeeded, execute the next security procedure, if any */
status = (uint8_t)btm_sec_execute_procedure(p_dev_rec);
/* If there is no next procedure, or procedure failed to start, notify the
* caller */
if (status != BTM_CMD_STARTED)
btm_sec_dev_rec_cback_event(p_dev_rec, status, false);
}
/*******************************************************************************
*
* Function btm_sec_connect_after_reject_timeout
*
* Description Connection for bonding could not start because of the
* collision. Initiate outgoing connection
*
* Returns Pointer to the TLE struct
*
******************************************************************************/
static void btm_sec_connect_after_reject_timeout(UNUSED_ATTR void* data) {
tBTM_SEC_DEV_REC* p_dev_rec = btm_cb.p_collided_dev_rec;
BTM_TRACE_EVENT("%s", __func__);
btm_cb.p_collided_dev_rec = 0;
if (btm_sec_dd_create_conn(p_dev_rec) != BTM_CMD_STARTED) {
BTM_TRACE_WARNING("Security Manager: %s: failed to start connection",
__func__);
btm_sec_change_pairing_state(BTM_PAIR_STATE_IDLE);
if (btm_cb.api.p_auth_complete_callback)
(*btm_cb.api.p_auth_complete_callback)(
p_dev_rec->bd_addr, p_dev_rec->dev_class, p_dev_rec->sec_bd_name,
HCI_ERR_MEMORY_FULL);
}
}
/*******************************************************************************
*
* Function btm_sec_connected
*
* Description This function is when a connection to the peer device is
* established
*
* Returns void
*
******************************************************************************/
void btm_sec_connected(const RawAddress& bda, uint16_t handle, uint8_t status,
uint8_t enc_mode) {
tBTM_SEC_DEV_REC* p_dev_rec = btm_find_dev(bda);
uint8_t res;
bool is_pairing_device = false;
bool addr_matched;
tACL_CONN* p_acl_cb;
uint8_t bit_shift = 0;
btm_acl_resubmit_page();
if (p_dev_rec) {
VLOG(2) << __func__ << ": Security Manager: in state: "
<< btm_pair_state_descr(btm_cb.pairing_state)
<< " handle:" << handle << " status:" << loghex(status)
<< " enc_mode:" << loghex(enc_mode) << " bda:" << bda
<< " RName:" << p_dev_rec->sec_bd_name;
} else {
VLOG(2) << __func__ << ": Security Manager: in state: "
<< btm_pair_state_descr(btm_cb.pairing_state)
<< " handle:" << handle << " status:" << loghex(status)
<< " enc_mode:" << loghex(enc_mode) << " bda:" << bda;
}
if (!p_dev_rec) {
/* There is no device record for new connection. Allocate one */
if (status == HCI_SUCCESS) {
p_dev_rec = btm_sec_alloc_dev(bda);
} else {
/* If the device matches with stored paring address
* reset the paring state to idle */
if ((btm_cb.pairing_state != BTM_PAIR_STATE_IDLE) &&
btm_cb.pairing_bda == bda) {
btm_sec_change_pairing_state(BTM_PAIR_STATE_IDLE);
}
/* can not find the device record and the status is error,
* just ignore it */
return;
}
} else /* Update the timestamp for this device */
{
bit_shift = (handle == p_dev_rec->ble_hci_handle) ? 8 : 0;
p_dev_rec->timestamp = btm_cb.dev_rec_count++;
if (p_dev_rec->sm4 & BTM_SM4_CONN_PEND) {
/* tell L2CAP it's a bonding connection. */
if ((btm_cb.pairing_state != BTM_PAIR_STATE_IDLE) &&
(btm_cb.pairing_bda == p_dev_rec->bd_addr) &&
(btm_cb.pairing_flags & BTM_PAIR_FLAGS_WE_STARTED_DD)) {
/* if incoming connection failed while pairing, then try to connect and
* continue */
/* Motorola S9 disconnects without asking pin code */
if ((status != HCI_SUCCESS) &&
(btm_cb.pairing_state == BTM_PAIR_STATE_WAIT_PIN_REQ)) {
BTM_TRACE_WARNING(
"Security Manager: btm_sec_connected: incoming connection failed "
"without asking PIN");
p_dev_rec->sm4 &= ~BTM_SM4_CONN_PEND;
if (p_dev_rec->sec_flags & BTM_SEC_NAME_KNOWN) {
/* Start timer with 0 to initiate connection with new LCB */
/* because L2CAP will delete current LCB with this event */
btm_cb.p_collided_dev_rec = p_dev_rec;
alarm_set_on_mloop(btm_cb.sec_collision_timer, 0,
btm_sec_connect_after_reject_timeout, NULL);
} else {
btm_sec_change_pairing_state(BTM_PAIR_STATE_GET_REM_NAME);
if (BTM_ReadRemoteDeviceName(p_dev_rec->bd_addr, NULL,
BT_TRANSPORT_BR_EDR) !=
BTM_CMD_STARTED) {
BTM_TRACE_ERROR("%s cannot read remote name", __func__);
btm_sec_change_pairing_state(BTM_PAIR_STATE_IDLE);
}
}
#if (BTM_DISC_DURING_RS == TRUE)
p_dev_rec->rs_disc_pending = BTM_SEC_RS_NOT_PENDING; /* reset flag */
#endif
return;
} else {
l2cu_update_lcb_4_bonding(p_dev_rec->bd_addr, true);
}
}
/* always clear the pending flag */
p_dev_rec->sm4 &= ~BTM_SM4_CONN_PEND;
}
}
p_dev_rec->device_type |= BT_DEVICE_TYPE_BREDR;
#if (BTM_DISC_DURING_RS == TRUE)
p_dev_rec->rs_disc_pending = BTM_SEC_RS_NOT_PENDING; /* reset flag */
#endif
p_dev_rec->rs_disc_pending = BTM_SEC_RS_NOT_PENDING; /* reset flag */
addr_matched = (btm_cb.pairing_bda == bda);
if ((btm_cb.pairing_state != BTM_PAIR_STATE_IDLE) && addr_matched) {
/* if we rejected incoming connection from bonding device */
if ((status == HCI_ERR_HOST_REJECT_DEVICE) &&
(btm_cb.pairing_flags & BTM_PAIR_FLAGS_REJECTED_CONNECT)) {
BTM_TRACE_WARNING(
"Security Manager: btm_sec_connected: HCI_Conn_Comp Flags:0x%04x, "
"sm4: 0x%x",
btm_cb.pairing_flags, p_dev_rec->sm4);
btm_cb.pairing_flags &= ~BTM_PAIR_FLAGS_REJECTED_CONNECT;
if (BTM_SEC_IS_SM4_UNKNOWN(p_dev_rec->sm4)) {
/* Try again: RNR when no ACL causes HCI_RMT_HOST_SUP_FEAT_NOTIFY_EVT */
btm_sec_change_pairing_state(BTM_PAIR_STATE_GET_REM_NAME);
if (BTM_ReadRemoteDeviceName(bda, NULL, BT_TRANSPORT_BR_EDR) !=
BTM_CMD_STARTED) {
BTM_TRACE_ERROR("%s cannot read remote name", __func__);
btm_sec_change_pairing_state(BTM_PAIR_STATE_IDLE);
}
return;
}
/* if we already have pin code */
if (btm_cb.pairing_state != BTM_PAIR_STATE_WAIT_LOCAL_PIN) {
/* Start timer with 0 to initiate connection with new LCB */
/* because L2CAP will delete current LCB with this event */
btm_cb.p_collided_dev_rec = p_dev_rec;
alarm_set_on_mloop(btm_cb.sec_collision_timer, 0,
btm_sec_connect_after_reject_timeout, NULL);
}
return;
}
/* wait for incoming connection without resetting pairing state */
else if (status == HCI_ERR_CONNECTION_EXISTS) {
BTM_TRACE_WARNING(
"Security Manager: btm_sec_connected: Wait for incoming connection");
return;
}
is_pairing_device = true;
}
/* If connection was made to do bonding restore link security if changed */
btm_restore_mode();
/* if connection fails during pin request, notify application */
if (status != HCI_SUCCESS) {
/* If connection failed because of during pairing, need to tell user */
if (is_pairing_device) {
p_dev_rec->security_required &= ~BTM_SEC_OUT_AUTHENTICATE;
p_dev_rec->sec_flags &=
~((BTM_SEC_LINK_KEY_KNOWN | BTM_SEC_LINK_KEY_AUTHED) << bit_shift);
BTM_TRACE_DEBUG("security_required:%x ", p_dev_rec->security_required);
btm_sec_change_pairing_state(BTM_PAIR_STATE_IDLE);
/* We need to notify host that the key is not known any more */
if (btm_cb.api.p_auth_complete_callback) {
(*btm_cb.api.p_auth_complete_callback)(p_dev_rec->bd_addr,
p_dev_rec->dev_class,
p_dev_rec->sec_bd_name, status);
}
}
/*
Do not send authentication failure, if following conditions hold good
1. BTM Sec Pairing state is idle
2. Link key for the remote device is present.
3. Remote is SSP capable.
*/
else if ((p_dev_rec->link_key_type <= BTM_LKEY_TYPE_REMOTE_UNIT) &&
(((status == HCI_ERR_AUTH_FAILURE) ||
(status == HCI_ERR_KEY_MISSING) ||
(status == HCI_ERR_HOST_REJECT_SECURITY) ||
(status == HCI_ERR_PAIRING_NOT_ALLOWED) ||
(status == HCI_ERR_UNIT_KEY_USED) ||
(status == HCI_ERR_PAIRING_WITH_UNIT_KEY_NOT_SUPPORTED) ||
(status == HCI_ERR_ENCRY_MODE_NOT_ACCEPTABLE) ||
(status == HCI_ERR_REPEATED_ATTEMPTS)))) {
p_dev_rec->security_required &= ~BTM_SEC_OUT_AUTHENTICATE;
p_dev_rec->sec_flags &= ~(BTM_SEC_LE_LINK_KEY_KNOWN << bit_shift);
#ifdef BRCM_NOT_4_BTE
/* If we rejected pairing, pass this special result code */
if (btm_cb.acl_disc_reason == HCI_ERR_HOST_REJECT_SECURITY) {
status = HCI_ERR_HOST_REJECT_SECURITY;
}
#endif
/* We need to notify host that the key is not known any more */
if (btm_cb.api.p_auth_complete_callback) {
(*btm_cb.api.p_auth_complete_callback)(p_dev_rec->bd_addr,
p_dev_rec->dev_class,
p_dev_rec->sec_bd_name, status);
}
}
/* p_auth_complete_callback might have freed the p_dev_rec, ensure it exists
* before accessing */
p_dev_rec = btm_find_dev(bda);
if (!p_dev_rec) {
/* Don't callback when device security record was removed */
VLOG(1) << __func__
<< ": device security record associated with this bda has been "
"removed! bda="
<< bda << ", do not callback!";
return;
}
if (status == HCI_ERR_CONNECTION_TOUT ||
status == HCI_ERR_LMP_RESPONSE_TIMEOUT ||
status == HCI_ERR_UNSPECIFIED || status == HCI_ERR_PAGE_TIMEOUT)
btm_sec_dev_rec_cback_event(p_dev_rec, BTM_DEVICE_TIMEOUT, false);
else
btm_sec_dev_rec_cback_event(p_dev_rec, BTM_ERR_PROCESSING, false);
return;
}
/* If initiated dedicated bonding, return the link key now, and initiate
* disconnect */
/* If dedicated bonding, and we now have a link key, we are all done */
if (is_pairing_device && (p_dev_rec->sec_flags & BTM_SEC_LINK_KEY_KNOWN)) {
if (p_dev_rec->link_key_not_sent) {
p_dev_rec->link_key_not_sent = false;
btm_send_link_key_notif(p_dev_rec);
}
p_dev_rec->security_required &= ~BTM_SEC_OUT_AUTHENTICATE;
/* remember flag before it is initialized */
if (btm_cb.pairing_flags & BTM_PAIR_FLAGS_WE_STARTED_DD)
res = true;
else
res = false;
if (btm_cb.api.p_auth_complete_callback)
(*btm_cb.api.p_auth_complete_callback)(
p_dev_rec->bd_addr, p_dev_rec->dev_class, p_dev_rec->sec_bd_name,
HCI_SUCCESS);
btm_sec_change_pairing_state(BTM_PAIR_STATE_IDLE);
if (res) {
/* Let l2cap start bond timer */
l2cu_update_lcb_4_bonding(p_dev_rec->bd_addr, true);
}
return;
}
p_dev_rec->hci_handle = handle;
/* role may not be correct here, it will be updated by l2cap, but we need to
*/
/* notify btm_acl that link is up, so starting of rmt name request will not */
/* set paging flag up */
p_acl_cb = btm_bda_to_acl(bda, BT_TRANSPORT_BR_EDR);
if (p_acl_cb) {
/* whatever is in btm_establish_continue() without reporting the BTM_BL_CONN_EVT
* event */
#if (BTM_BYPASS_EXTRA_ACL_SETUP == FALSE)
/* For now there are a some devices that do not like sending */
/* commands events and data at the same time. */
/* Set the packet types to the default allowed by the device */
btm_set_packet_types(p_acl_cb, btm_cb.btm_acl_pkt_types_supported);
if (btm_cb.btm_def_link_policy)
BTM_SetLinkPolicy(p_acl_cb->remote_addr, &btm_cb.btm_def_link_policy);
#endif
}
btm_acl_created(bda, p_dev_rec->dev_class, p_dev_rec->sec_bd_name, handle,
HCI_ROLE_SLAVE, BT_TRANSPORT_BR_EDR);
/* Initialize security flags. We need to do that because some */
/* authorization complete could have come after the connection is dropped */
/* and that would set wrong flag that link has been authorized already */
p_dev_rec->sec_flags &= ~((BTM_SEC_AUTHORIZED | BTM_SEC_AUTHENTICATED |
BTM_SEC_ENCRYPTED | BTM_SEC_ROLE_SWITCHED)
<< bit_shift);
if (enc_mode != HCI_ENCRYPT_MODE_DISABLED)
p_dev_rec->sec_flags |=
((BTM_SEC_AUTHENTICATED | BTM_SEC_ENCRYPTED) << bit_shift);
if (btm_cb.security_mode == BTM_SEC_MODE_LINK)
p_dev_rec->sec_flags |= (BTM_SEC_AUTHENTICATED << bit_shift);
if (p_dev_rec->pin_code_length >= 16 ||
p_dev_rec->link_key_type == BTM_LKEY_TYPE_AUTH_COMB ||
p_dev_rec->link_key_type == BTM_LKEY_TYPE_AUTH_COMB_P_256) {
p_dev_rec->sec_flags |= (BTM_SEC_16_DIGIT_PIN_AUTHED << bit_shift);
}
p_dev_rec->link_key_changed = false;
/* After connection is established we perform security if we do not know */
/* the name, or if we are originator because some procedure can have */
/* been scheduled while connection was down */
BTM_TRACE_DEBUG("is_originator:%d ", p_dev_rec->is_originator);
if (!(p_dev_rec->sec_flags & BTM_SEC_NAME_KNOWN) ||
p_dev_rec->is_originator) {
res = btm_sec_execute_procedure(p_dev_rec);
if (res != BTM_CMD_STARTED)
btm_sec_dev_rec_cback_event(p_dev_rec, res, false);
}
return;
}
/*******************************************************************************
*
* Function btm_sec_disconnect
*
* Description This function is called to disconnect HCI link
*
* Returns btm status
*
******************************************************************************/
tBTM_STATUS btm_sec_disconnect(uint16_t handle, uint8_t reason) {
tBTM_SEC_DEV_REC* p_dev_rec = btm_find_dev_by_handle(handle);
/* In some weird race condition we may not have a record */
if (!p_dev_rec) {
btsnd_hcic_disconnect(handle, reason);
return (BTM_SUCCESS);
}
/* If we are in the process of bonding we need to tell client that auth failed
*/
if ((btm_cb.pairing_state != BTM_PAIR_STATE_IDLE) &&
(btm_cb.pairing_bda == p_dev_rec->bd_addr) &&
(btm_cb.pairing_flags & BTM_PAIR_FLAGS_WE_STARTED_DD)) {
/* we are currently doing bonding. Link will be disconnected when done */
btm_cb.pairing_flags |= BTM_PAIR_FLAGS_DISC_WHEN_DONE;
return (BTM_BUSY);
}
return (btm_sec_send_hci_disconnect(p_dev_rec, reason, handle));
}
/*******************************************************************************
*
* Function btm_sec_disconnected
*
* Description This function is when a connection to the peer device is
* dropped
*
* Returns void
*
******************************************************************************/
void btm_sec_disconnected(uint16_t handle, uint8_t reason) {
tBTM_SEC_DEV_REC* p_dev_rec = btm_find_dev_by_handle(handle);
uint8_t old_pairing_flags = btm_cb.pairing_flags;
int result = HCI_ERR_AUTH_FAILURE;
tBTM_SEC_CALLBACK* p_callback = NULL;
tBT_TRANSPORT transport = BT_TRANSPORT_BR_EDR;
/* If page was delayed for disc complete, can do it now */
btm_cb.discing = false;
btm_acl_resubmit_page();
if (!p_dev_rec) return;
transport =
(handle == p_dev_rec->hci_handle) ? BT_TRANSPORT_BR_EDR : BT_TRANSPORT_LE;
p_dev_rec->rs_disc_pending = BTM_SEC_RS_NOT_PENDING; /* reset flag */
#if (BTM_DISC_DURING_RS == TRUE)
LOG_INFO(LOG_TAG, "%s clearing pending flag handle:%d reason:%d", __func__,
handle, reason);
p_dev_rec->rs_disc_pending = BTM_SEC_RS_NOT_PENDING; /* reset flag */
#endif
/* clear unused flags */
p_dev_rec->sm4 &= BTM_SM4_TRUE;
VLOG(2) << __func__ << " bd_addr: " << p_dev_rec->bd_addr
<< " name: " << p_dev_rec->sec_bd_name
<< " state: " << btm_pair_state_descr(btm_cb.pairing_state)
<< " reason: " << reason << " sec_req: " << std::hex
<< p_dev_rec->security_required;
BTM_TRACE_EVENT("%s before update sec_flags=0x%x", __func__,
p_dev_rec->sec_flags);
/* If we are in the process of bonding we need to tell client that auth failed
*/
if ((btm_cb.pairing_state != BTM_PAIR_STATE_IDLE) &&
(btm_cb.pairing_bda == p_dev_rec->bd_addr)) {
btm_sec_change_pairing_state(BTM_PAIR_STATE_IDLE);
p_dev_rec->sec_flags &= ~BTM_SEC_LINK_KEY_KNOWN;
if (btm_cb.api.p_auth_complete_callback) {
/* If the disconnection reason is REPEATED_ATTEMPTS,
send this error message to complete callback function
to display the error message of Repeated attempts.
All others, send HCI_ERR_AUTH_FAILURE. */
if (reason == HCI_ERR_REPEATED_ATTEMPTS) {
result = HCI_ERR_REPEATED_ATTEMPTS;
} else if (old_pairing_flags & BTM_PAIR_FLAGS_WE_STARTED_DD) {
result = HCI_ERR_HOST_REJECT_SECURITY;
}
(*btm_cb.api.p_auth_complete_callback)(p_dev_rec->bd_addr,
p_dev_rec->dev_class,
p_dev_rec->sec_bd_name, result);
// |btm_cb.api.p_auth_complete_callback| may cause |p_dev_rec| to be
// deallocated.
p_dev_rec = btm_find_dev_by_handle(handle);
if (!p_dev_rec) {
return;
}
}
}
btm_ble_update_mode_operation(HCI_ROLE_UNKNOWN, &p_dev_rec->bd_addr,
HCI_SUCCESS);
/* see sec_flags processing in btm_acl_removed */
if (transport == BT_TRANSPORT_LE) {
p_dev_rec->ble_hci_handle = BTM_SEC_INVALID_HANDLE;
p_dev_rec->sec_flags &= ~(BTM_SEC_LE_AUTHENTICATED | BTM_SEC_LE_ENCRYPTED);
p_dev_rec->enc_key_size = 0;
// This is for chips that don't support being in connected and advertising
// state at same time.
if (!p_dev_rec->is_originator) {
btm_ble_advertiser_notify_terminated_legacy(HCI_SUCCESS, handle);
}
} else {
p_dev_rec->hci_handle = BTM_SEC_INVALID_HANDLE;
p_dev_rec->sec_flags &=
~(BTM_SEC_AUTHORIZED | BTM_SEC_AUTHENTICATED | BTM_SEC_ENCRYPTED |
BTM_SEC_ROLE_SWITCHED | BTM_SEC_16_DIGIT_PIN_AUTHED);
// Remove temporary key.
if (p_dev_rec->bond_type == BOND_TYPE_TEMPORARY)
p_dev_rec->sec_flags &= ~(BTM_SEC_LINK_KEY_KNOWN);
}
/* Some devices hardcode sample LTK value from spec, instead of generating
* one. Treat such devices as insecure, and remove such bonds on
* disconnection.
*/
if (is_sample_ltk(p_dev_rec->ble.keys.pltk)) {
android_errorWriteLog(0x534e4554, "128437297");
LOG(INFO) << __func__ << " removing bond to device that used sample LTK: " << p_dev_rec->bd_addr;
bta_dm_remove_device(p_dev_rec->bd_addr);
}
BTM_TRACE_EVENT("%s after update sec_flags=0x%x", __func__,
p_dev_rec->sec_flags);
if (p_dev_rec->sec_state == BTM_SEC_STATE_DISCONNECTING_BOTH) {
p_dev_rec->sec_state = (transport == BT_TRANSPORT_LE)
? BTM_SEC_STATE_DISCONNECTING
: BTM_SEC_STATE_DISCONNECTING_BLE;
return;
}
p_dev_rec->sec_state = BTM_SEC_STATE_IDLE;
p_dev_rec->security_required = BTM_SEC_NONE;
p_callback = p_dev_rec->p_callback;
/* if security is pending, send callback to clean up the security state */
if (p_callback) {
BTM_TRACE_DEBUG("%s: clearing callback. p_dev_rec=%p, p_callback=%p",
__func__, p_dev_rec, p_dev_rec->p_callback);
p_dev_rec->p_callback =
NULL; /* when the peer device time out the authentication before
we do, this call back must be reset here */
(*p_callback)(&p_dev_rec->bd_addr, transport, p_dev_rec->p_ref_data,
BTM_ERR_PROCESSING);
}
}
/** This function is called when a new connection link key is generated */
void btm_sec_link_key_notification(const RawAddress& p_bda,
const Octet16& link_key, uint8_t key_type) {
tBTM_SEC_DEV_REC* p_dev_rec = btm_find_or_alloc_dev(p_bda);
bool we_are_bonding = false;
bool ltk_derived_lk = false;
VLOG(2) << __func__ << " BDA: " << p_bda << ", TYPE: " << +key_type;
if ((key_type >= BTM_LTK_DERIVED_LKEY_OFFSET + BTM_LKEY_TYPE_COMBINATION) &&
(key_type <=
BTM_LTK_DERIVED_LKEY_OFFSET + BTM_LKEY_TYPE_AUTH_COMB_P_256)) {
ltk_derived_lk = true;
key_type -= BTM_LTK_DERIVED_LKEY_OFFSET;
}
/* If connection was made to do bonding restore link security if changed */
btm_restore_mode();
if (key_type != BTM_LKEY_TYPE_CHANGED_COMB)
p_dev_rec->link_key_type = key_type;
p_dev_rec->sec_flags |= BTM_SEC_LINK_KEY_KNOWN;
/*
* Until this point in time, we do not know if MITM was enabled, hence we
* add the extended security flag here.
*/
if (p_dev_rec->pin_code_length >= 16 ||
p_dev_rec->link_key_type == BTM_LKEY_TYPE_AUTH_COMB ||
p_dev_rec->link_key_type == BTM_LKEY_TYPE_AUTH_COMB_P_256) {
p_dev_rec->sec_flags |= BTM_SEC_16_DIGIT_PIN_AUTHED;
}
/* BR/EDR connection, update the encryption key size to be 16 as always */
p_dev_rec->enc_key_size = 16;
p_dev_rec->link_key = link_key;
if ((btm_cb.pairing_state != BTM_PAIR_STATE_IDLE) &&
(btm_cb.pairing_bda == p_bda)) {
if (btm_cb.pairing_flags & BTM_PAIR_FLAGS_WE_STARTED_DD)
we_are_bonding = true;
else
btm_sec_change_pairing_state(BTM_PAIR_STATE_IDLE);
}
/* save LTK derived LK no matter what */
if (ltk_derived_lk) {
if (btm_cb.api.p_link_key_callback) {
BTM_TRACE_DEBUG("%s() Save LTK derived LK (key_type = %d)", __func__,
p_dev_rec->link_key_type);
(*btm_cb.api.p_link_key_callback)(p_bda, p_dev_rec->dev_class,
p_dev_rec->sec_bd_name, link_key,
p_dev_rec->link_key_type);
}
} else {
if ((p_dev_rec->link_key_type == BTM_LKEY_TYPE_UNAUTH_COMB_P_256) ||
(p_dev_rec->link_key_type == BTM_LKEY_TYPE_AUTH_COMB_P_256)) {
p_dev_rec->new_encryption_key_is_p256 = true;
BTM_TRACE_DEBUG("%s set new_encr_key_256 to %d", __func__,
p_dev_rec->new_encryption_key_is_p256);
}
}
/* If name is not known at this point delay calling callback until the name is
*/
/* resolved. Unless it is a HID Device and we really need to send all link
* keys. */
if ((!(p_dev_rec->sec_flags & BTM_SEC_NAME_KNOWN) &&
((p_dev_rec->dev_class[1] & BTM_COD_MAJOR_CLASS_MASK) !=
BTM_COD_MAJOR_PERIPHERAL)) &&
!ltk_derived_lk) {
VLOG(2) << __func__ << " Delayed BDA: " << p_bda << " Type:" << +key_type;
p_dev_rec->link_key_not_sent = true;
/* If it is for bonding nothing else will follow, so we need to start name
* resolution */
if (we_are_bonding) {
btsnd_hcic_rmt_name_req(p_bda, HCI_PAGE_SCAN_REP_MODE_R1,
HCI_MANDATARY_PAGE_SCAN_MODE, 0);
}
BTM_TRACE_EVENT("rmt_io_caps:%d, sec_flags:x%x, dev_class[1]:x%02x",
p_dev_rec->rmt_io_caps, p_dev_rec->sec_flags,
p_dev_rec->dev_class[1])
return;
}
/* If its not us who perform authentication, we should tell stackserver */
/* that some authentication has been completed */
/* This is required when different entities receive link notification and auth
* complete */
if (!(p_dev_rec->security_required & BTM_SEC_OUT_AUTHENTICATE)
/* for derived key, always send authentication callback for BR channel */
|| ltk_derived_lk) {
if (btm_cb.api.p_auth_complete_callback)
(*btm_cb.api.p_auth_complete_callback)(
p_dev_rec->bd_addr, p_dev_rec->dev_class, p_dev_rec->sec_bd_name,
HCI_SUCCESS);
}
/* We will save link key only if the user authorized it - BTE report link key in
* all cases */
#ifdef BRCM_NONE_BTE
if (p_dev_rec->sec_flags & BTM_SEC_LINK_KEY_AUTHED)
#endif
{
if (btm_cb.api.p_link_key_callback) {
if (ltk_derived_lk) {
BTM_TRACE_DEBUG(
"btm_sec_link_key_notification() LTK derived LK is saved already"
" (key_type = %d)",
p_dev_rec->link_key_type);
} else {
(*btm_cb.api.p_link_key_callback)(p_bda, p_dev_rec->dev_class,
p_dev_rec->sec_bd_name, link_key,
p_dev_rec->link_key_type);
}
}
}
}
/*******************************************************************************
*
* Function btm_sec_link_key_request
*
* Description This function is called when controller requests link key
*
* Returns Pointer to the record or NULL
*
******************************************************************************/
void btm_sec_link_key_request(const RawAddress& bda) {
tBTM_SEC_DEV_REC* p_dev_rec = btm_find_or_alloc_dev(bda);
VLOG(2) << __func__ << " bda: " << bda;
if ((btm_cb.pairing_state == BTM_PAIR_STATE_WAIT_PIN_REQ) &&
(btm_cb.collision_start_time != 0) &&
(btm_cb.p_collided_dev_rec->bd_addr == bda)) {
BTM_TRACE_EVENT(
"btm_sec_link_key_request() rejecting link key req "
"State: %d START_TIMEOUT : %d",
btm_cb.pairing_state, btm_cb.collision_start_time);
btsnd_hcic_link_key_neg_reply(bda);
return;
}
if (p_dev_rec->sec_flags & BTM_SEC_LINK_KEY_KNOWN) {
btsnd_hcic_link_key_req_reply(bda, p_dev_rec->link_key);
return;
}
/* Notify L2CAP to increase timeout */
l2c_pin_code_request(bda);
/* The link key is not in the database and it is not known to the manager */
btsnd_hcic_link_key_neg_reply(bda);
}
/*******************************************************************************
*
* Function btm_sec_pairing_timeout
*
* Description This function is called when host does not provide PIN
* within requested time
*
* Returns Pointer to the TLE struct
*
******************************************************************************/
static void btm_sec_pairing_timeout(UNUSED_ATTR void* data) {
tBTM_CB* p_cb = &btm_cb;
tBTM_SEC_DEV_REC* p_dev_rec;
tBTM_AUTH_REQ auth_req = (btm_cb.devcb.loc_io_caps == BTM_IO_CAP_NONE)
? BTM_AUTH_AP_NO
: BTM_AUTH_AP_YES;
uint8_t name[2];
p_dev_rec = btm_find_dev(p_cb->pairing_bda);
BTM_TRACE_EVENT("%s State: %s Flags: %u", __func__,
btm_pair_state_descr(p_cb->pairing_state),
p_cb->pairing_flags);
switch (p_cb->pairing_state) {
case BTM_PAIR_STATE_WAIT_PIN_REQ:
btm_sec_bond_cancel_complete();
break;
case BTM_PAIR_STATE_WAIT_LOCAL_PIN:
if ((btm_cb.pairing_flags & BTM_PAIR_FLAGS_PRE_FETCH_PIN) == 0)
btsnd_hcic_pin_code_neg_reply(p_cb->pairing_bda);
btm_sec_change_pairing_state(BTM_PAIR_STATE_IDLE);
/* We need to notify the UI that no longer need the PIN */
if (btm_cb.api.p_auth_complete_callback) {
if (p_dev_rec == NULL) {
name[0] = 0;
(*btm_cb.api.p_auth_complete_callback)(p_cb->pairing_bda, NULL, name,
HCI_ERR_CONNECTION_TOUT);
} else
(*btm_cb.api.p_auth_complete_callback)(
p_dev_rec->bd_addr, p_dev_rec->dev_class, p_dev_rec->sec_bd_name,
HCI_ERR_CONNECTION_TOUT);
}
break;
case BTM_PAIR_STATE_WAIT_NUMERIC_CONFIRM:
btsnd_hcic_user_conf_reply(p_cb->pairing_bda, false);
/* btm_sec_change_pairing_state (BTM_PAIR_STATE_IDLE); */
break;
case BTM_PAIR_STATE_KEY_ENTRY:
if (btm_cb.devcb.loc_io_caps != BTM_IO_CAP_NONE) {
btsnd_hcic_user_passkey_neg_reply(p_cb->pairing_bda);
} else {
btm_sec_change_pairing_state(BTM_PAIR_STATE_IDLE);
}
break;
case BTM_PAIR_STATE_WAIT_LOCAL_IOCAPS:
if (btm_cb.pairing_flags & BTM_PAIR_FLAGS_WE_STARTED_DD)
auth_req |= BTM_AUTH_DD_BOND;
btsnd_hcic_io_cap_req_reply(p_cb->pairing_bda, btm_cb.devcb.loc_io_caps,
BTM_OOB_NONE, auth_req);
btm_sec_change_pairing_state(BTM_PAIR_STATE_IDLE);
break;
case BTM_PAIR_STATE_WAIT_LOCAL_OOB_RSP:
btsnd_hcic_rem_oob_neg_reply(p_cb->pairing_bda);
btm_sec_change_pairing_state(BTM_PAIR_STATE_IDLE);
break;
case BTM_PAIR_STATE_WAIT_DISCONNECT:
/* simple pairing failed. Started a 1-sec timer at simple pairing
* complete.
* now it's time to tear down the ACL link*/
if (p_dev_rec == NULL) {
LOG(ERROR) << __func__
<< " BTM_PAIR_STATE_WAIT_DISCONNECT unknown BDA: "
<< p_cb->pairing_bda;
break;
}
btm_sec_send_hci_disconnect(p_dev_rec, HCI_ERR_AUTH_FAILURE,
p_dev_rec->hci_handle);
btm_sec_change_pairing_state(BTM_PAIR_STATE_IDLE);
break;
case BTM_PAIR_STATE_WAIT_AUTH_COMPLETE:
case BTM_PAIR_STATE_GET_REM_NAME:
/* We need to notify the UI that timeout has happened while waiting for
* authentication*/
btm_sec_change_pairing_state(BTM_PAIR_STATE_IDLE);
if (btm_cb.api.p_auth_complete_callback) {
if (p_dev_rec == NULL) {
name[0] = 0;
(*btm_cb.api.p_auth_complete_callback)(p_cb->pairing_bda, NULL, name,
HCI_ERR_CONNECTION_TOUT);
} else
(*btm_cb.api.p_auth_complete_callback)(
p_dev_rec->bd_addr, p_dev_rec->dev_class, p_dev_rec->sec_bd_name,
HCI_ERR_CONNECTION_TOUT);
}
break;
default:
BTM_TRACE_WARNING("%s not processed state: %s", __func__,
btm_pair_state_descr(btm_cb.pairing_state));
btm_sec_change_pairing_state(BTM_PAIR_STATE_IDLE);
break;
}
}
/*******************************************************************************
*
* Function btm_sec_pin_code_request
*
* Description This function is called when controller requests PIN code
*
* Returns Pointer to the record or NULL
*
******************************************************************************/
void btm_sec_pin_code_request(const RawAddress& p_bda) {
tBTM_SEC_DEV_REC* p_dev_rec;
tBTM_CB* p_cb = &btm_cb;
VLOG(2) << __func__ << " BDA: " << p_bda
<< " state: " << btm_pair_state_descr(btm_cb.pairing_state);
if (btm_cb.pairing_state != BTM_PAIR_STATE_IDLE) {
if ((p_bda == btm_cb.pairing_bda) &&
(btm_cb.pairing_state == BTM_PAIR_STATE_WAIT_AUTH_COMPLETE)) {
btsnd_hcic_pin_code_neg_reply(p_bda);
return;
} else if ((btm_cb.pairing_state != BTM_PAIR_STATE_WAIT_PIN_REQ) ||
p_bda != btm_cb.pairing_bda) {
BTM_TRACE_WARNING("btm_sec_pin_code_request() rejected - state: %s",
btm_pair_state_descr(btm_cb.pairing_state));
btsnd_hcic_pin_code_neg_reply(p_bda);
return;
}
}
p_dev_rec = btm_find_or_alloc_dev(p_bda);
/* received PIN code request. must be non-sm4 */
p_dev_rec->sm4 = BTM_SM4_KNOWN;
if (btm_cb.pairing_state == BTM_PAIR_STATE_IDLE) {
btm_cb.pairing_bda = p_bda;
btm_cb.pairing_flags = BTM_PAIR_FLAGS_PEER_STARTED_DD;
/* Make sure we reset the trusted mask to help against attacks */
BTM_SEC_CLR_TRUSTED_DEVICE(p_dev_rec->trusted_mask);
}
if (!p_cb->pairing_disabled && (p_cb->cfg.pin_type == HCI_PIN_TYPE_FIXED)) {
BTM_TRACE_EVENT("btm_sec_pin_code_request fixed pin replying");
btm_sec_change_pairing_state(BTM_PAIR_STATE_WAIT_AUTH_COMPLETE);
btsnd_hcic_pin_code_req_reply(p_bda, p_cb->cfg.pin_code_len,
p_cb->cfg.pin_code);
return;
}
/* Use the connecting device's CoD for the connection */
if ((p_bda == p_cb->connecting_bda) &&
(p_cb->connecting_dc[0] || p_cb->connecting_dc[1] ||
p_cb->connecting_dc[2]))
memcpy(p_dev_rec->dev_class, p_cb->connecting_dc, DEV_CLASS_LEN);
/* We could have started connection after asking user for the PIN code */
if (btm_cb.pin_code_len != 0) {
BTM_TRACE_EVENT("btm_sec_pin_code_request bonding sending reply");
btsnd_hcic_pin_code_req_reply(p_bda, btm_cb.pin_code_len, p_cb->pin_code);
/* Mark that we forwarded received from the user PIN code */
btm_cb.pin_code_len = 0;
/* We can change mode back right away, that other connection being
* established */
/* is not forced to be secure - found a FW issue, so we can not do this
btm_restore_mode(); */
btm_sec_change_pairing_state(BTM_PAIR_STATE_WAIT_AUTH_COMPLETE);
}
/* If pairing disabled OR (no PIN callback and not bonding) */
/* OR we could not allocate entry in the database reject pairing request */
else if (
p_cb->pairing_disabled ||
(p_cb->api.p_pin_callback == NULL)
/* OR Microsoft keyboard can for some reason try to establish connection
*/
/* the only thing we can do here is to shut it up. Normally we will be
originator */
/* for keyboard bonding */
|| (!p_dev_rec->is_originator &&
((p_dev_rec->dev_class[1] & BTM_COD_MAJOR_CLASS_MASK) ==
BTM_COD_MAJOR_PERIPHERAL) &&
(p_dev_rec->dev_class[2] & BTM_COD_MINOR_KEYBOARD))) {
BTM_TRACE_WARNING(
"btm_sec_pin_code_request(): Pairing disabled:%d; PIN callback:%x, Dev "
"Rec:%x!",
p_cb->pairing_disabled, p_cb->api.p_pin_callback, p_dev_rec);
btsnd_hcic_pin_code_neg_reply(p_bda);
}
/* Notify upper layer of PIN request and start expiration timer */
else {
btm_sec_change_pairing_state(BTM_PAIR_STATE_WAIT_LOCAL_PIN);
/* Pin code request can not come at the same time as connection request */
p_cb->connecting_bda = p_bda;
memcpy(p_cb->connecting_dc, p_dev_rec->dev_class, DEV_CLASS_LEN);
/* Check if the name is known */
/* Even if name is not known we might not be able to get one */
/* this is the case when we are already getting something from the */
/* device, so HCI level is flow controlled */
/* Also cannot send remote name request while paging, i.e. connection is not
* completed */
if (p_dev_rec->sec_flags & BTM_SEC_NAME_KNOWN) {
BTM_TRACE_EVENT("btm_sec_pin_code_request going for callback");
btm_cb.pairing_flags |= BTM_PAIR_FLAGS_PIN_REQD;
if (p_cb->api.p_pin_callback) {
(*p_cb->api.p_pin_callback)(
p_bda, p_dev_rec->dev_class, p_dev_rec->sec_bd_name,
(p_dev_rec->p_cur_service == NULL)
? false
: (p_dev_rec->p_cur_service->security_flags &
BTM_SEC_IN_MIN_16_DIGIT_PIN));
}
} else {
BTM_TRACE_EVENT("btm_sec_pin_code_request going for remote name");
/* We received PIN code request for the device with unknown name */
/* it is not user friendly just to ask for the PIN without name */
/* try to get name at first */
btsnd_hcic_rmt_name_req(p_dev_rec->bd_addr, HCI_PAGE_SCAN_REP_MODE_R1,
HCI_MANDATARY_PAGE_SCAN_MODE, 0);
}
}
return;
}
/*******************************************************************************
*
* Function btm_sec_update_clock_offset
*
* Description This function is called to update clock offset
*
* Returns void
*
******************************************************************************/
void btm_sec_update_clock_offset(uint16_t handle, uint16_t clock_offset) {
tBTM_SEC_DEV_REC* p_dev_rec;
tBTM_INQ_INFO* p_inq_info;
p_dev_rec = btm_find_dev_by_handle(handle);
if (p_dev_rec == NULL) return;
p_dev_rec->clock_offset = clock_offset | BTM_CLOCK_OFFSET_VALID;
p_inq_info = BTM_InqDbRead(p_dev_rec->bd_addr);
if (p_inq_info == NULL) return;
p_inq_info->results.clock_offset = clock_offset | BTM_CLOCK_OFFSET_VALID;
}
/******************************************************************
* S T A T I C F U N C T I O N S
******************************************************************/
/*******************************************************************************
*
* Function btm_sec_execute_procedure
*
* Description This function is called to start required security
* procedure. There is a case when multiplexing protocol
* calls this function on the originating side, connection to
* the peer will not be established. This function in this
* case performs only authorization.
*
* Returns BTM_SUCCESS - permission is granted
* BTM_CMD_STARTED - in process
* BTM_NO_RESOURCES - permission declined
*
******************************************************************************/
tBTM_STATUS btm_sec_execute_procedure(tBTM_SEC_DEV_REC* p_dev_rec) {
BTM_TRACE_EVENT(
"btm_sec_execute_procedure: Required:0x%x Flags:0x%x State:%d",
p_dev_rec->security_required, p_dev_rec->sec_flags, p_dev_rec->sec_state);
/* There is a chance that we are getting name. Wait until done. */
if (p_dev_rec->sec_state != 0) return (BTM_CMD_STARTED);
/* If any security is required, get the name first */
if (!(p_dev_rec->sec_flags & BTM_SEC_NAME_KNOWN) &&
(p_dev_rec->hci_handle != BTM_SEC_INVALID_HANDLE)) {
BTM_TRACE_EVENT("Security Manager: Start get name");
if (!btm_sec_start_get_name(p_dev_rec)) {
return (BTM_NO_RESOURCES);
}
return (BTM_CMD_STARTED);
}
/* If connection is not authenticated and authentication is required */
/* start authentication and return PENDING to the caller */
if ((((!(p_dev_rec->sec_flags & BTM_SEC_AUTHENTICATED)) &&
((p_dev_rec->is_originator &&
(p_dev_rec->security_required & BTM_SEC_OUT_AUTHENTICATE)) ||
(!p_dev_rec->is_originator &&
(p_dev_rec->security_required & BTM_SEC_IN_AUTHENTICATE)))) ||
(!(p_dev_rec->sec_flags & BTM_SEC_16_DIGIT_PIN_AUTHED) &&
(!p_dev_rec->is_originator &&
(p_dev_rec->security_required & BTM_SEC_IN_MIN_16_DIGIT_PIN)))) &&
(p_dev_rec->hci_handle != BTM_SEC_INVALID_HANDLE)) {
/*
* We rely on BTM_SEC_16_DIGIT_PIN_AUTHED being set if MITM is in use,
* as 16 DIGIT is only needed if MITM is not used. Unfortunately, the
* BTM_SEC_AUTHENTICATED is used for both MITM and non-MITM
* authenticated connections, hence we cannot distinguish here.
*/
BTM_TRACE_EVENT("Security Manager: Start authentication");
/*
* If we do have a link-key, but we end up here because we need an
* upgrade, then clear the link-key known and authenticated flag before
* restarting authentication.
* WARNING: If the controller has link-key, it is optional and
* recommended for the controller to send a Link_Key_Request.
* In case we need an upgrade, the only alternative would be to delete
* the existing link-key. That could lead to very bad user experience
* or even IOP issues, if a reconnect causes a new connection that
* requires an upgrade.
*/
if ((p_dev_rec->sec_flags & BTM_SEC_LINK_KEY_KNOWN) &&
(!(p_dev_rec->sec_flags & BTM_SEC_16_DIGIT_PIN_AUTHED) &&
(!p_dev_rec->is_originator &&
(p_dev_rec->security_required & BTM_SEC_IN_MIN_16_DIGIT_PIN)))) {
p_dev_rec->sec_flags &=
~(BTM_SEC_LINK_KEY_KNOWN | BTM_SEC_LINK_KEY_AUTHED |
BTM_SEC_AUTHENTICATED);
}
btm_sec_start_authentication(p_dev_rec);
return (BTM_CMD_STARTED);
}
/* If connection is not encrypted and encryption is required */
/* start encryption and return PENDING to the caller */
if (!(p_dev_rec->sec_flags & BTM_SEC_ENCRYPTED) &&
((p_dev_rec->is_originator &&
(p_dev_rec->security_required & BTM_SEC_OUT_ENCRYPT)) ||
(!p_dev_rec->is_originator &&
(p_dev_rec->security_required & BTM_SEC_IN_ENCRYPT))) &&
(p_dev_rec->hci_handle != BTM_SEC_INVALID_HANDLE)) {
BTM_TRACE_EVENT("Security Manager: Start encryption");
btm_sec_start_encryption(p_dev_rec);
return (BTM_CMD_STARTED);
}
if ((p_dev_rec->security_required & BTM_SEC_MODE4_LEVEL4) &&
(p_dev_rec->link_key_type != BTM_LKEY_TYPE_AUTH_COMB_P_256)) {
BTM_TRACE_EVENT(
"%s: Security Manager: SC only service, but link key type is 0x%02x -",
"security failure", __func__, p_dev_rec->link_key_type);
return (BTM_FAILED_ON_SECURITY);
}
/* If connection is not authorized and authorization is required */
/* start authorization and return PENDING to the caller */
if (!(p_dev_rec->sec_flags & BTM_SEC_AUTHORIZED) &&
((p_dev_rec->is_originator &&
(p_dev_rec->security_required & BTM_SEC_OUT_AUTHORIZE)) ||
(!p_dev_rec->is_originator &&
(p_dev_rec->security_required & BTM_SEC_IN_AUTHORIZE)))) {
BTM_TRACE_EVENT(
"service id:%d, is trusted:%d", p_dev_rec->p_cur_service->service_id,
(BTM_SEC_IS_SERVICE_TRUSTED(p_dev_rec->trusted_mask,
p_dev_rec->p_cur_service->service_id)));
if ((!btm_sec_are_all_trusted(p_dev_rec->trusted_mask)) &&
(p_dev_rec->p_cur_service->service_id < BTM_SEC_MAX_SERVICES) &&
(!BTM_SEC_IS_SERVICE_TRUSTED(p_dev_rec->trusted_mask,
p_dev_rec->p_cur_service->service_id))) {
BTM_TRACE_EVENT("Security Manager: Start authorization");
return (btm_sec_start_authorization(p_dev_rec));
}
}
/* All required security procedures already established */
p_dev_rec->security_required &=
~(BTM_SEC_OUT_AUTHORIZE | BTM_SEC_IN_AUTHORIZE |
BTM_SEC_OUT_AUTHENTICATE | BTM_SEC_IN_AUTHENTICATE |
BTM_SEC_OUT_ENCRYPT | BTM_SEC_IN_ENCRYPT | BTM_SEC_FORCE_MASTER |
BTM_SEC_ATTEMPT_MASTER | BTM_SEC_FORCE_SLAVE | BTM_SEC_ATTEMPT_SLAVE);
BTM_TRACE_EVENT("Security Manager: trusted:0x%04x%04x",
p_dev_rec->trusted_mask[1], p_dev_rec->trusted_mask[0]);
BTM_TRACE_EVENT("Security Manager: access granted");
return (BTM_SUCCESS);
}
/*******************************************************************************
*
* Function btm_sec_start_get_name
*
* Description This function is called to start get name procedure
*
* Returns true if started
*
******************************************************************************/
static bool btm_sec_start_get_name(tBTM_SEC_DEV_REC* p_dev_rec) {
uint8_t tempstate = p_dev_rec->sec_state;
p_dev_rec->sec_state = BTM_SEC_STATE_GETTING_NAME;
/* 0 and NULL are as timeout and callback params because they are not used in
* security get name case */
if ((btm_initiate_rem_name(p_dev_rec->bd_addr, BTM_RMT_NAME_SEC, 0, NULL)) !=
BTM_CMD_STARTED) {
p_dev_rec->sec_state = tempstate;
return (false);
}
return (true);
}
/*******************************************************************************
*
* Function btm_sec_start_authentication
*
* Description This function is called to start authentication
*
******************************************************************************/
static void btm_sec_start_authentication(tBTM_SEC_DEV_REC* p_dev_rec) {
p_dev_rec->sec_state = BTM_SEC_STATE_AUTHENTICATING;
btsnd_hcic_auth_request(p_dev_rec->hci_handle);
}
/*******************************************************************************
*
* Function btm_sec_start_encryption
*
* Description This function is called to start encryption
*
******************************************************************************/
static void btm_sec_start_encryption(tBTM_SEC_DEV_REC* p_dev_rec) {
btsnd_hcic_set_conn_encrypt(p_dev_rec->hci_handle, true);
p_dev_rec->sec_state = BTM_SEC_STATE_ENCRYPTING;
}
/*******************************************************************************
*
* Function btm_sec_start_authorization
*
* Description This function is called to start authorization
*
* Returns true if started
*
******************************************************************************/
static uint8_t btm_sec_start_authorization(tBTM_SEC_DEV_REC* p_dev_rec) {
uint8_t result;
uint8_t* p_service_name = NULL;
uint8_t service_id;
if ((p_dev_rec->sec_flags & BTM_SEC_NAME_KNOWN) ||
(p_dev_rec->hci_handle == BTM_SEC_INVALID_HANDLE)) {
if (!btm_cb.api.p_authorize_callback) return (BTM_MODE_UNSUPPORTED);
if (p_dev_rec->p_cur_service) {
#if BTM_SEC_SERVICE_NAME_LEN > 0
if (p_dev_rec->is_originator)
p_service_name = p_dev_rec->p_cur_service->orig_service_name;
else
p_service_name = p_dev_rec->p_cur_service->term_service_name;
#endif
service_id = p_dev_rec->p_cur_service->service_id;
} else
service_id = 0;
/* Send authorization request if not already sent during this service
* connection */
if (p_dev_rec->last_author_service_id == BTM_SEC_NO_LAST_SERVICE_ID ||
p_dev_rec->last_author_service_id != service_id) {
p_dev_rec->sec_state = BTM_SEC_STATE_AUTHORIZING;
result = (*btm_cb.api.p_authorize_callback)(
p_dev_rec->bd_addr, p_dev_rec->dev_class, p_dev_rec->sec_bd_name,
p_service_name, service_id, p_dev_rec->is_originator);
}
else /* Already authorized once for this L2CAP bringup */
{
BTM_TRACE_DEBUG(
"btm_sec_start_authorization: (Ignoring extra Authorization prompt "
"for service %d)",
service_id);
return (BTM_SUCCESS);
}
if (result == BTM_SUCCESS) {
p_dev_rec->sec_flags |= BTM_SEC_AUTHORIZED;
/* Save the currently authorized service in case we are asked again by
* another multiplexer layer */
if (!p_dev_rec->is_originator)
p_dev_rec->last_author_service_id = service_id;
p_dev_rec->sec_state = BTM_SEC_STATE_IDLE;
}
return (result);
}
btm_sec_start_get_name(p_dev_rec);
return (BTM_CMD_STARTED);
}
/*******************************************************************************
*
* Function btm_sec_are_all_trusted
*
* Description This function is called check if all services are trusted
*
* Returns true if all are trusted, otherwise false
*
******************************************************************************/
bool btm_sec_are_all_trusted(uint32_t p_mask[]) {
uint32_t trusted_inx;
for (trusted_inx = 0; trusted_inx < BTM_SEC_SERVICE_ARRAY_SIZE;
trusted_inx++) {
if (p_mask[trusted_inx] != BTM_SEC_TRUST_ALL) return (false);
}
return (true);
}
/*******************************************************************************
*
* Function btm_sec_find_first_serv
*
* Description Look for the first record in the service database
* with specified PSM
*
* Returns Pointer to the record or NULL
*
******************************************************************************/
tBTM_SEC_SERV_REC* btm_sec_find_first_serv(CONNECTION_TYPE conn_type,
uint16_t psm) {
tBTM_SEC_SERV_REC* p_serv_rec = &btm_cb.sec_serv_rec[0];
int i;
bool is_originator = conn_type;
if (is_originator && btm_cb.p_out_serv && btm_cb.p_out_serv->psm == psm) {
/* If this is outgoing connection and the PSM matches p_out_serv,
* use it as the current service */
return btm_cb.p_out_serv;
}
/* otherwise, just find the first record with the specified PSM */
for (i = 0; i < BTM_SEC_MAX_SERVICE_RECORDS; i++, p_serv_rec++) {
if ((p_serv_rec->security_flags & BTM_SEC_IN_USE) &&
(p_serv_rec->psm == psm))
return (p_serv_rec);
}
return (NULL);
}
/*******************************************************************************
*
* Function btm_sec_find_next_serv
*
* Description Look for the next record in the service database
* with specified PSM
*
* Returns Pointer to the record or NULL
*
******************************************************************************/
static tBTM_SEC_SERV_REC* btm_sec_find_next_serv(tBTM_SEC_SERV_REC* p_cur) {
tBTM_SEC_SERV_REC* p_serv_rec = &btm_cb.sec_serv_rec[0];
int i;
for (i = 0; i < BTM_SEC_MAX_SERVICE_RECORDS; i++, p_serv_rec++) {
if ((p_serv_rec->security_flags & BTM_SEC_IN_USE) &&
(p_serv_rec->psm == p_cur->psm)) {
if (p_cur != p_serv_rec) {
return (p_serv_rec);
}
}
}
return (NULL);
}
/*******************************************************************************
*
* Function btm_sec_find_mx_serv
*
* Description Look for the record in the service database with specified
* PSM and multiplexor channel information
*
* Returns Pointer to the record or NULL
*
******************************************************************************/
static tBTM_SEC_SERV_REC* btm_sec_find_mx_serv(uint8_t is_originator,
uint16_t psm,
uint32_t mx_proto_id,
uint32_t mx_chan_id) {
tBTM_SEC_SERV_REC* p_out_serv = btm_cb.p_out_serv;
tBTM_SEC_SERV_REC* p_serv_rec = &btm_cb.sec_serv_rec[0];
int i;
BTM_TRACE_DEBUG("%s()", __func__);
if (is_originator && p_out_serv && p_out_serv->psm == psm &&
p_out_serv->mx_proto_id == mx_proto_id &&
p_out_serv->orig_mx_chan_id == mx_chan_id) {
/* If this is outgoing connection and the parameters match p_out_serv,
* use it as the current service */
return btm_cb.p_out_serv;
}
/* otherwise, the old way */
for (i = 0; i < BTM_SEC_MAX_SERVICE_RECORDS; i++, p_serv_rec++) {
if ((p_serv_rec->security_flags & BTM_SEC_IN_USE) &&
(p_serv_rec->psm == psm) && (p_serv_rec->mx_proto_id == mx_proto_id) &&
((is_originator && (p_serv_rec->orig_mx_chan_id == mx_chan_id)) ||
(!is_originator && (p_serv_rec->term_mx_chan_id == mx_chan_id)))) {
return (p_serv_rec);
}
}
return (NULL);
}
/*******************************************************************************
*
* Function btm_sec_collision_timeout
*
* Description Encryption could not start because of the collision
* try to do it again
*
* Returns Pointer to the TLE struct
*
******************************************************************************/
static void btm_sec_collision_timeout(UNUSED_ATTR void* data) {
BTM_TRACE_EVENT("%s()", __func__);
tBTM_STATUS status = btm_sec_execute_procedure(btm_cb.p_collided_dev_rec);
/* If result is pending reply from the user or from the device is pending */
if (status != BTM_CMD_STARTED) {
/* There is no next procedure or start of procedure failed, notify the
* waiting layer */
btm_sec_dev_rec_cback_event(btm_cb.p_collided_dev_rec, status, false);
}
}
/*******************************************************************************
*
* Function btm_send_link_key_notif
*
* Description Call the link key callback.
*
* Returns void
*
******************************************************************************/
static void btm_send_link_key_notif(tBTM_SEC_DEV_REC* p_dev_rec) {
if (btm_cb.api.p_link_key_callback)
(*btm_cb.api.p_link_key_callback)(
p_dev_rec->bd_addr, p_dev_rec->dev_class, p_dev_rec->sec_bd_name,
p_dev_rec->link_key, p_dev_rec->link_key_type);
}
/*******************************************************************************
*
* Function BTM_ReadTrustedMask
*
* Description Get trusted mask for the peer device
*
* Parameters: bd_addr - Address of the device
*
* Returns NULL, if the device record is not found.
* otherwise, the trusted mask
*
******************************************************************************/
uint32_t* BTM_ReadTrustedMask(const RawAddress& bd_addr) {
tBTM_SEC_DEV_REC* p_dev_rec = btm_find_dev(bd_addr);
if (p_dev_rec != NULL) return (p_dev_rec->trusted_mask);
return NULL;
}
/*******************************************************************************
*
* Function btm_restore_mode
*
* Description This function returns the security mode to previous setting
* if it was changed during bonding.
*
*
* Parameters: void
*
******************************************************************************/
static void btm_restore_mode(void) {
if (btm_cb.security_mode_changed) {
btm_cb.security_mode_changed = false;
BTM_TRACE_DEBUG("%s() Auth enable -> %d", __func__,
(btm_cb.security_mode == BTM_SEC_MODE_LINK));
btsnd_hcic_write_auth_enable(
(uint8_t)(btm_cb.security_mode == BTM_SEC_MODE_LINK));
}
if (btm_cb.pin_type_changed) {
btm_cb.pin_type_changed = false;
btsnd_hcic_write_pin_type(btm_cb.cfg.pin_type);
}
}
bool is_sec_state_equal(void* data, void* context) {
tBTM_SEC_DEV_REC* p_dev_rec = static_cast<tBTM_SEC_DEV_REC*>(data);
uint8_t* state = static_cast<uint8_t*>(context);
if (p_dev_rec->sec_state == *state) return false;
return true;
}
/*******************************************************************************
*
* Function btm_sec_find_dev_by_sec_state
*
* Description Look for the record in the device database for the device
* which is being authenticated or encrypted
*
* Returns Pointer to the record or NULL
*
******************************************************************************/
tBTM_SEC_DEV_REC* btm_sec_find_dev_by_sec_state(uint8_t state) {
list_node_t* n = list_foreach(btm_cb.sec_dev_rec, is_sec_state_equal, &state);
if (n) return static_cast<tBTM_SEC_DEV_REC*>(list_node(n));
return NULL;
}
/*******************************************************************************
*
* Function btm_sec_change_pairing_state
*
* Description This function is called to change pairing state
*
******************************************************************************/
static void btm_sec_change_pairing_state(tBTM_PAIRING_STATE new_state) {
tBTM_PAIRING_STATE old_state = btm_cb.pairing_state;
BTM_TRACE_EVENT("%s() Old: %s", __func__,
btm_pair_state_descr(btm_cb.pairing_state));
BTM_TRACE_EVENT("%s() New: %s pairing_flags:0x%x", __func__,
btm_pair_state_descr(new_state), btm_cb.pairing_flags);
btm_cb.pairing_state = new_state;
if (new_state == BTM_PAIR_STATE_IDLE) {
alarm_cancel(btm_cb.pairing_timer);
btm_cb.pairing_flags = 0;
btm_cb.pin_code_len = 0;
/* Make sure the the lcb shows we are not bonding */
l2cu_update_lcb_4_bonding(btm_cb.pairing_bda, false);
btm_restore_mode();
btm_sec_check_pending_reqs();
btm_inq_clear_ssp();
btm_cb.pairing_bda = RawAddress::kAny;
} else {
/* If transitioning out of idle, mark the lcb as bonding */
if (old_state == BTM_PAIR_STATE_IDLE)
l2cu_update_lcb_4_bonding(btm_cb.pairing_bda, true);
alarm_set_on_mloop(btm_cb.pairing_timer, BTM_SEC_TIMEOUT_VALUE * 1000,
btm_sec_pairing_timeout, NULL);
}
}
/*******************************************************************************
*
* Function btm_pair_state_descr
*
* Description Return state description for tracing
*
******************************************************************************/
static const char* btm_pair_state_descr(tBTM_PAIRING_STATE state) {
switch (state) {
case BTM_PAIR_STATE_IDLE:
return ("IDLE");
case BTM_PAIR_STATE_GET_REM_NAME:
return ("GET_REM_NAME");
case BTM_PAIR_STATE_WAIT_PIN_REQ:
return ("WAIT_PIN_REQ");
case BTM_PAIR_STATE_WAIT_LOCAL_PIN:
return ("WAIT_LOCAL_PIN");
case BTM_PAIR_STATE_WAIT_NUMERIC_CONFIRM:
return ("WAIT_NUM_CONFIRM");
case BTM_PAIR_STATE_KEY_ENTRY:
return ("KEY_ENTRY");
case BTM_PAIR_STATE_WAIT_LOCAL_OOB_RSP:
return ("WAIT_LOCAL_OOB_RSP");
case BTM_PAIR_STATE_WAIT_LOCAL_IOCAPS:
return ("WAIT_LOCAL_IOCAPS");
case BTM_PAIR_STATE_INCOMING_SSP:
return ("INCOMING_SSP");
case BTM_PAIR_STATE_WAIT_AUTH_COMPLETE:
return ("WAIT_AUTH_COMPLETE");
case BTM_PAIR_STATE_WAIT_DISCONNECT:
return ("WAIT_DISCONNECT");
}
return ("???");
}
/*******************************************************************************
*
* Function btm_sec_dev_rec_cback_event
*
* Description This function calls the callback function with the given
* result and clear the callback function.
*
* Parameters: void
*
******************************************************************************/
void btm_sec_dev_rec_cback_event(tBTM_SEC_DEV_REC* p_dev_rec, uint8_t res,
bool is_le_transport) {
tBTM_SEC_CALLBACK* p_callback = p_dev_rec->p_callback;
BTM_TRACE_DEBUG("%s: p_callback=%p, is_le_transport=%d, res=%d, p_dev_rec=%p",
__func__, p_dev_rec->p_callback, is_le_transport, res,
p_dev_rec);
if (p_dev_rec->p_callback) {
p_dev_rec->p_callback = NULL;
if (is_le_transport)
(*p_callback)(&p_dev_rec->ble.pseudo_addr, BT_TRANSPORT_LE,
p_dev_rec->p_ref_data, res);
else
(*p_callback)(&p_dev_rec->bd_addr, BT_TRANSPORT_BR_EDR,
p_dev_rec->p_ref_data, res);
}
btm_sec_check_pending_reqs();
}
/*******************************************************************************
*
* Function btm_sec_queue_mx_request
*
* Description Return state description for tracing
*
******************************************************************************/
static bool btm_sec_queue_mx_request(const RawAddress& bd_addr, uint16_t psm,
bool is_orig, uint32_t mx_proto_id,
uint32_t mx_chan_id,
tBTM_SEC_CALLBACK* p_callback,
void* p_ref_data) {
tBTM_SEC_QUEUE_ENTRY* p_e =
(tBTM_SEC_QUEUE_ENTRY*)osi_malloc(sizeof(tBTM_SEC_QUEUE_ENTRY));
p_e->psm = psm;
p_e->is_orig = is_orig;
p_e->p_callback = p_callback;
p_e->p_ref_data = p_ref_data;
p_e->mx_proto_id = mx_proto_id;
p_e->mx_chan_id = mx_chan_id;
p_e->transport = BT_TRANSPORT_BR_EDR;
p_e->sec_act = 0;
p_e->bd_addr = bd_addr;
BTM_TRACE_EVENT(
"%s() PSM: 0x%04x Is_Orig: %u mx_proto_id: %u mx_chan_id: %u",
__func__, psm, is_orig, mx_proto_id, mx_chan_id);
fixed_queue_enqueue(btm_cb.sec_pending_q, p_e);
return true;
}
static bool btm_sec_check_prefetch_pin(tBTM_SEC_DEV_REC* p_dev_rec) {
uint8_t major = (uint8_t)(p_dev_rec->dev_class[1] & BTM_COD_MAJOR_CLASS_MASK);
uint8_t minor = (uint8_t)(p_dev_rec->dev_class[2] & BTM_COD_MINOR_CLASS_MASK);
bool rv = false;
if ((major == BTM_COD_MAJOR_AUDIO) &&
((minor == BTM_COD_MINOR_CONFM_HANDSFREE) ||
(minor == BTM_COD_MINOR_CAR_AUDIO))) {
BTM_TRACE_EVENT(
"%s() Skipping pre-fetch PIN for carkit COD Major: 0x%02x Minor: "
"0x%02x",
__func__, major, minor);
if (!btm_cb.security_mode_changed) {
btm_cb.security_mode_changed = true;
#ifdef APPL_AUTH_WRITE_EXCEPTION
if (!(APPL_AUTH_WRITE_EXCEPTION)(p_dev_rec->bd_addr))
#endif
btsnd_hcic_write_auth_enable(true);
}
} else {
btm_sec_change_pairing_state(BTM_PAIR_STATE_WAIT_LOCAL_PIN);
/* If we got a PIN, use that, else try to get one */
if (btm_cb.pin_code_len) {
BTM_PINCodeReply(p_dev_rec->bd_addr, BTM_SUCCESS, btm_cb.pin_code_len,
btm_cb.pin_code, p_dev_rec->trusted_mask);
} else {
/* pin was not supplied - pre-fetch pin code now */
if (btm_cb.api.p_pin_callback &&
((btm_cb.pairing_flags & BTM_PAIR_FLAGS_PIN_REQD) == 0)) {
BTM_TRACE_DEBUG("%s() PIN code callback called", __func__);
if (btm_bda_to_acl(p_dev_rec->bd_addr, BT_TRANSPORT_BR_EDR) == NULL)
btm_cb.pairing_flags |= BTM_PAIR_FLAGS_PIN_REQD;
(btm_cb.api.p_pin_callback)(
p_dev_rec->bd_addr, p_dev_rec->dev_class, p_dev_rec->sec_bd_name,
(p_dev_rec->p_cur_service == NULL)
? false
: (p_dev_rec->p_cur_service->security_flags &
BTM_SEC_IN_MIN_16_DIGIT_PIN));
}
}
rv = true;
}
return rv;
}
/*******************************************************************************
*
* Function btm_sec_auth_payload_tout
*
* Description Processes the HCI Autheniticated Payload Timeout Event
* indicating that a packet containing a valid MIC on the
* connection handle was not received within the programmed
* timeout value. (Spec Default is 30 secs, but can be
* changed via the BTM_SecSetAuthPayloadTimeout() function.
*
******************************************************************************/
void btm_sec_auth_payload_tout(uint8_t* p, uint16_t hci_evt_len) {
uint16_t handle;
STREAM_TO_UINT16(handle, p);
handle = HCID_GET_HANDLE(handle);
/* Will be exposed to upper layers in the future if/when determined necessary
*/
BTM_TRACE_ERROR("%s on handle 0x%02x", __func__, handle);
}
/*******************************************************************************
*
* Function btm_sec_queue_encrypt_request
*
* Description encqueue encryption request when device has active security
* process pending.
*
******************************************************************************/
static bool btm_sec_queue_encrypt_request(const RawAddress& bd_addr,
tBT_TRANSPORT transport,
tBTM_SEC_CALLBACK* p_callback,
void* p_ref_data,
tBTM_BLE_SEC_ACT sec_act) {
tBTM_SEC_QUEUE_ENTRY* p_e =
(tBTM_SEC_QUEUE_ENTRY*)osi_malloc(sizeof(tBTM_SEC_QUEUE_ENTRY) + 1);
p_e->psm = 0; /* if PSM 0, encryption request */
p_e->p_callback = p_callback;
p_e->p_ref_data = p_ref_data;
p_e->transport = transport;
p_e->sec_act = sec_act;
p_e->bd_addr = bd_addr;
fixed_queue_enqueue(btm_cb.sec_pending_q, p_e);
return true;
}
/*******************************************************************************
*
* Function btm_sec_set_peer_sec_caps
*
* Description This function is called to set sm4 and rmt_sec_caps fields
* based on the available peer device features.
*
* Returns void
*
******************************************************************************/
void btm_sec_set_peer_sec_caps(tACL_CONN* p_acl_cb,
tBTM_SEC_DEV_REC* p_dev_rec) {
if ((btm_cb.security_mode == BTM_SEC_MODE_SP ||
btm_cb.security_mode == BTM_SEC_MODE_SP_DEBUG ||
btm_cb.security_mode == BTM_SEC_MODE_SC) &&
HCI_SSP_HOST_SUPPORTED(p_acl_cb->peer_lmp_feature_pages[1])) {
p_dev_rec->sm4 = BTM_SM4_TRUE;
p_dev_rec->remote_supports_secure_connections =
(HCI_SC_HOST_SUPPORTED(p_acl_cb->peer_lmp_feature_pages[1]));
} else {
p_dev_rec->sm4 = BTM_SM4_KNOWN;
p_dev_rec->remote_supports_secure_connections = false;
}
BTM_TRACE_API("%s: sm4: 0x%02x, rmt_support_for_secure_connections %d",
__func__, p_dev_rec->sm4,
p_dev_rec->remote_supports_secure_connections);
if (p_dev_rec->remote_features_needed) {
BTM_TRACE_EVENT(
"%s: Now device in SC Only mode, waiting for peer remote features!",
__func__);
btm_io_capabilities_req(p_dev_rec->bd_addr);
p_dev_rec->remote_features_needed = false;
}
}
/*******************************************************************************
*
* Function btm_sec_is_serv_level0
*
* Description This function is called to check if the service
* corresponding to PSM is security mode 4 level 0 service.
*
* Returns true if the service is security mode 4 level 0 service
*
******************************************************************************/
static bool btm_sec_is_serv_level0(uint16_t psm) {
if (psm == BT_PSM_SDP) {
BTM_TRACE_DEBUG("%s: PSM: 0x%04x -> mode 4 level 0 service", __func__, psm);
return true;
}
return false;
}
/*******************************************************************************
*
* Function btm_sec_check_pending_enc_req
*
* Description This function is called to send pending encryption callback
* if waiting
*
* Returns void
*
******************************************************************************/
static void btm_sec_check_pending_enc_req(tBTM_SEC_DEV_REC* p_dev_rec,
tBT_TRANSPORT transport,
uint8_t encr_enable) {
if (fixed_queue_is_empty(btm_cb.sec_pending_q)) return;
uint8_t res = encr_enable ? BTM_SUCCESS : BTM_ERR_PROCESSING;
list_t* list = fixed_queue_get_list(btm_cb.sec_pending_q);
for (const list_node_t* node = list_begin(list); node != list_end(list);) {
tBTM_SEC_QUEUE_ENTRY* p_e = (tBTM_SEC_QUEUE_ENTRY*)list_node(node);
node = list_next(node);
if (p_e->bd_addr == p_dev_rec->bd_addr && p_e->psm == 0 &&
p_e->transport == transport) {
if (encr_enable == 0 || transport == BT_TRANSPORT_BR_EDR ||
p_e->sec_act == BTM_BLE_SEC_ENCRYPT ||
p_e->sec_act == BTM_BLE_SEC_ENCRYPT_NO_MITM ||
(p_e->sec_act == BTM_BLE_SEC_ENCRYPT_MITM &&
p_dev_rec->sec_flags & BTM_SEC_LE_AUTHENTICATED)) {
if (p_e->p_callback)
(*p_e->p_callback)(&p_dev_rec->bd_addr, transport, p_e->p_ref_data,
res);
fixed_queue_try_remove_from_queue(btm_cb.sec_pending_q, (void*)p_e);
}
}
}
}
/*******************************************************************************
*
* Function btm_sec_set_serv_level4_flags
*
* Description This function is called to set security mode 4 level 4
* flags.
*
* Returns service security requirements updated to include secure
* connections only mode.
*
******************************************************************************/
static uint16_t btm_sec_set_serv_level4_flags(uint16_t cur_security,
bool is_originator) {
uint16_t sec_level4_flags =
is_originator ? BTM_SEC_OUT_LEVEL4_FLAGS : BTM_SEC_IN_LEVEL4_FLAGS;
return cur_security | sec_level4_flags;
}
/*******************************************************************************
*
* Function btm_sec_clear_ble_keys
*
* Description This function is called to clear out the BLE keys.
* Typically when devices are removed in BTM_SecDeleteDevice,
* or when a new BT Link key is generated.
*
* Returns void
*
******************************************************************************/
void btm_sec_clear_ble_keys(tBTM_SEC_DEV_REC* p_dev_rec) {
BTM_TRACE_DEBUG("%s() Clearing BLE Keys", __func__);
p_dev_rec->ble.key_type = BTM_LE_KEY_NONE;
memset(&p_dev_rec->ble.keys, 0, sizeof(tBTM_SEC_BLE_KEYS));
#if (BLE_PRIVACY_SPT == TRUE)
btm_ble_resolving_list_remove_dev(p_dev_rec);
#endif
}
/*******************************************************************************
*
* Function btm_sec_is_a_bonded_dev
*
* Description Is the specified device is a bonded device
*
* Returns true - dev is bonded
*
******************************************************************************/
bool btm_sec_is_a_bonded_dev(const RawAddress& bda) {
tBTM_SEC_DEV_REC* p_dev_rec = btm_find_dev(bda);
bool is_bonded = false;
if (p_dev_rec && ((p_dev_rec->ble.key_type &&
(p_dev_rec->sec_flags & BTM_SEC_LE_LINK_KEY_KNOWN)) ||
(p_dev_rec->sec_flags & BTM_SEC_LINK_KEY_KNOWN))) {
is_bonded = true;
}
BTM_TRACE_DEBUG("%s() is_bonded=%d", __func__, is_bonded);
return (is_bonded);
}
/*******************************************************************************
*
* Function btm_sec_is_le_capable_dev
*
* Description Is the specified device is dual mode or LE only device
*
* Returns true - dev is a dual mode
*
******************************************************************************/
bool btm_sec_is_le_capable_dev(const RawAddress& bda) {
tBTM_SEC_DEV_REC* p_dev_rec = btm_find_dev(bda);
bool le_capable = false;
if (p_dev_rec &&
(p_dev_rec->device_type & BT_DEVICE_TYPE_BLE) == BT_DEVICE_TYPE_BLE)
le_capable = true;
return le_capable;
}
/*******************************************************************************
*
* Function btm_sec_use_smp_br_chnl
*
* Description The function checks if SMP BR connection can be used with
* the peer.
* Is called when authentication for dedicated bonding is
* successfully completed.
*
* Returns true - if SMP BR connection can be used (the link key is
* generated from P-256 and the peer supports Security
* Manager over BR).
*
******************************************************************************/
static bool btm_sec_use_smp_br_chnl(tBTM_SEC_DEV_REC* p_dev_rec) {
uint32_t ext_feat;
uint8_t chnl_mask[L2CAP_FIXED_CHNL_ARRAY_SIZE];
BTM_TRACE_DEBUG("%s() link_key_type = 0x%x", __func__,
p_dev_rec->link_key_type);
if ((p_dev_rec->link_key_type != BTM_LKEY_TYPE_UNAUTH_COMB_P_256) &&
(p_dev_rec->link_key_type != BTM_LKEY_TYPE_AUTH_COMB_P_256))
return false;
if (!L2CA_GetPeerFeatures(p_dev_rec->bd_addr, &ext_feat, chnl_mask))
return false;
if (!(chnl_mask[0] & L2CAP_FIXED_CHNL_SMP_BR_BIT)) return false;
return true;
}
/*******************************************************************************
*
* Function btm_sec_is_master
*
* Description The function checks if the device is BR/EDR master after
* pairing is completed.
*
* Returns true - if the device is master.
*
******************************************************************************/
static bool btm_sec_is_master(tBTM_SEC_DEV_REC* p_dev_rec) {
tACL_CONN* p = btm_bda_to_acl(p_dev_rec->bd_addr, BT_TRANSPORT_BR_EDR);
return (p && (p->link_role == BTM_ROLE_MASTER));
}