Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
Yabin Cui | 19bec5b | 2015-09-22 15:52:57 -0700 | [diff] [blame] | 17 | #define TRACE_TAG AUTH |
Dan Albert | db6fe64 | 2015-03-19 15:21:08 -0700 | [diff] [blame] | 18 | |
| 19 | #include "sysdeps.h" |
| 20 | #include "adb_auth.h" |
| 21 | |
Dan Albert | b302d12 | 2015-02-24 15:51:19 -0800 | [diff] [blame] | 22 | #include <resolv.h> |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 23 | #include <stdio.h> |
| 24 | #include <string.h> |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 25 | |
Dan Albert | b302d12 | 2015-02-24 15:51:19 -0800 | [diff] [blame] | 26 | #include "cutils/list.h" |
| 27 | #include "cutils/sockets.h" |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 28 | #include "mincrypt/rsa.h" |
Doug Zongker | 25129a5 | 2013-04-10 09:22:02 -0700 | [diff] [blame] | 29 | #include "mincrypt/sha.h" |
Dan Albert | db6fe64 | 2015-03-19 15:21:08 -0700 | [diff] [blame] | 30 | |
| 31 | #include "adb.h" |
| 32 | #include "fdevent.h" |
Dan Albert | b302d12 | 2015-02-24 15:51:19 -0800 | [diff] [blame] | 33 | #include "transport.h" |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 34 | |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 35 | struct adb_public_key { |
| 36 | struct listnode node; |
| 37 | RSAPublicKey key; |
| 38 | }; |
| 39 | |
Dan Albert | f30d73c | 2015-02-25 17:51:28 -0800 | [diff] [blame] | 40 | static const char *key_paths[] = { |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 41 | "/adb_keys", |
| 42 | "/data/misc/adb/adb_keys", |
| 43 | NULL |
| 44 | }; |
| 45 | |
| 46 | static fdevent listener_fde; |
Josh Gao | 7a8c7cb | 2016-02-23 18:05:57 -0800 | [diff] [blame^] | 47 | static fdevent framework_fde; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 48 | static int framework_fd = -1; |
| 49 | |
Benoit Goby | d592d6c | 2013-01-15 19:59:14 -0800 | [diff] [blame] | 50 | static void usb_disconnected(void* unused, atransport* t); |
Yabin Cui | 2d4c198 | 2015-08-28 15:09:44 -0700 | [diff] [blame] | 51 | static struct adisconnect usb_disconnect = { usb_disconnected, nullptr}; |
Benoit Goby | d592d6c | 2013-01-15 19:59:14 -0800 | [diff] [blame] | 52 | static atransport* usb_transport; |
| 53 | static bool needs_retry = false; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 54 | |
| 55 | static void read_keys(const char *file, struct listnode *list) |
| 56 | { |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 57 | FILE *f; |
Tamas Berghammer | a1c60c0 | 2015-07-13 19:12:28 +0100 | [diff] [blame] | 58 | char buf[MAX_PAYLOAD_V1]; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 59 | char *sep; |
| 60 | int ret; |
| 61 | |
Nick Kralevich | 777523e | 2014-07-18 20:57:35 -0700 | [diff] [blame] | 62 | f = fopen(file, "re"); |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 63 | if (!f) { |
Yabin Cui | 815ad88 | 2015-09-02 17:44:28 -0700 | [diff] [blame] | 64 | D("Can't open '%s'", file); |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 65 | return; |
| 66 | } |
| 67 | |
| 68 | while (fgets(buf, sizeof(buf), f)) { |
| 69 | /* Allocate 4 extra bytes to decode the base64 data in-place */ |
Dan Albert | f30d73c | 2015-02-25 17:51:28 -0800 | [diff] [blame] | 70 | auto key = reinterpret_cast<adb_public_key*>( |
| 71 | calloc(1, sizeof(adb_public_key) + 4)); |
| 72 | if (key == nullptr) { |
Yabin Cui | 815ad88 | 2015-09-02 17:44:28 -0700 | [diff] [blame] | 73 | D("Can't malloc key"); |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 74 | break; |
| 75 | } |
| 76 | |
| 77 | sep = strpbrk(buf, " \t"); |
| 78 | if (sep) |
| 79 | *sep = '\0'; |
| 80 | |
| 81 | ret = __b64_pton(buf, (u_char *)&key->key, sizeof(key->key) + 4); |
| 82 | if (ret != sizeof(key->key)) { |
Yabin Cui | 815ad88 | 2015-09-02 17:44:28 -0700 | [diff] [blame] | 83 | D("%s: Invalid base64 data ret=%d", file, ret); |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 84 | free(key); |
| 85 | continue; |
| 86 | } |
| 87 | |
| 88 | if (key->key.len != RSANUMWORDS) { |
Yabin Cui | 815ad88 | 2015-09-02 17:44:28 -0700 | [diff] [blame] | 89 | D("%s: Invalid key len %d", file, key->key.len); |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 90 | free(key); |
| 91 | continue; |
| 92 | } |
| 93 | |
| 94 | list_add_tail(list, &key->node); |
| 95 | } |
| 96 | |
| 97 | fclose(f); |
| 98 | } |
| 99 | |
| 100 | static void free_keys(struct listnode *list) |
| 101 | { |
| 102 | struct listnode *item; |
| 103 | |
| 104 | while (!list_empty(list)) { |
| 105 | item = list_head(list); |
| 106 | list_remove(item); |
| 107 | free(node_to_item(item, struct adb_public_key, node)); |
| 108 | } |
| 109 | } |
| 110 | |
Benoit Goby | d84bc66 | 2013-01-14 21:26:30 -0800 | [diff] [blame] | 111 | static void load_keys(struct listnode *list) |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 112 | { |
Dan Albert | f30d73c | 2015-02-25 17:51:28 -0800 | [diff] [blame] | 113 | const char* path; |
| 114 | const char** paths = key_paths; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 115 | struct stat buf; |
| 116 | |
Benoit Goby | d84bc66 | 2013-01-14 21:26:30 -0800 | [diff] [blame] | 117 | list_init(list); |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 118 | |
| 119 | while ((path = *paths++)) { |
| 120 | if (!stat(path, &buf)) { |
Yabin Cui | 815ad88 | 2015-09-02 17:44:28 -0700 | [diff] [blame] | 121 | D("Loading keys from '%s'", path); |
Benoit Goby | d84bc66 | 2013-01-14 21:26:30 -0800 | [diff] [blame] | 122 | read_keys(path, list); |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 123 | } |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | int adb_auth_generate_token(void *token, size_t token_size) |
| 128 | { |
| 129 | FILE *f; |
| 130 | int ret; |
| 131 | |
Nick Kralevich | 777523e | 2014-07-18 20:57:35 -0700 | [diff] [blame] | 132 | f = fopen("/dev/urandom", "re"); |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 133 | if (!f) |
| 134 | return 0; |
| 135 | |
| 136 | ret = fread(token, token_size, 1, f); |
| 137 | |
| 138 | fclose(f); |
| 139 | return ret * token_size; |
| 140 | } |
| 141 | |
Dan Albert | f30d73c | 2015-02-25 17:51:28 -0800 | [diff] [blame] | 142 | int adb_auth_verify(uint8_t* token, uint8_t* sig, int siglen) |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 143 | { |
| 144 | struct listnode *item; |
Benoit Goby | d84bc66 | 2013-01-14 21:26:30 -0800 | [diff] [blame] | 145 | struct listnode key_list; |
| 146 | int ret = 0; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 147 | |
| 148 | if (siglen != RSANUMBYTES) |
| 149 | return 0; |
| 150 | |
Benoit Goby | d84bc66 | 2013-01-14 21:26:30 -0800 | [diff] [blame] | 151 | load_keys(&key_list); |
| 152 | |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 153 | list_for_each(item, &key_list) { |
Dan Albert | f30d73c | 2015-02-25 17:51:28 -0800 | [diff] [blame] | 154 | adb_public_key* key = node_to_item(item, struct adb_public_key, node); |
Doug Zongker | 25129a5 | 2013-04-10 09:22:02 -0700 | [diff] [blame] | 155 | ret = RSA_verify(&key->key, sig, siglen, token, SHA_DIGEST_SIZE); |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 156 | if (ret) |
Benoit Goby | d84bc66 | 2013-01-14 21:26:30 -0800 | [diff] [blame] | 157 | break; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 158 | } |
| 159 | |
Benoit Goby | d84bc66 | 2013-01-14 21:26:30 -0800 | [diff] [blame] | 160 | free_keys(&key_list); |
| 161 | |
| 162 | return ret; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 163 | } |
| 164 | |
Josh Gao | 7a8c7cb | 2016-02-23 18:05:57 -0800 | [diff] [blame^] | 165 | static void usb_disconnected(void* unused, atransport* t) { |
Yabin Cui | 815ad88 | 2015-09-02 17:44:28 -0700 | [diff] [blame] | 166 | D("USB disconnect"); |
Benoit Goby | d592d6c | 2013-01-15 19:59:14 -0800 | [diff] [blame] | 167 | usb_transport = NULL; |
| 168 | needs_retry = false; |
| 169 | } |
| 170 | |
Josh Gao | 7a8c7cb | 2016-02-23 18:05:57 -0800 | [diff] [blame^] | 171 | static void framework_disconnected() { |
| 172 | D("Framework disconnect"); |
| 173 | fdevent_remove(&framework_fde); |
| 174 | framework_fd = -1; |
| 175 | } |
| 176 | |
| 177 | static void adb_auth_event(int fd, unsigned events, void*) { |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 178 | char response[2]; |
| 179 | int ret; |
| 180 | |
| 181 | if (events & FDE_READ) { |
| 182 | ret = unix_read(fd, response, sizeof(response)); |
Vince Harron | 8212542 | 2014-09-25 21:51:15 -0700 | [diff] [blame] | 183 | if (ret <= 0) { |
Josh Gao | 7a8c7cb | 2016-02-23 18:05:57 -0800 | [diff] [blame^] | 184 | framework_disconnected(); |
| 185 | } else if (ret == 2 && response[0] == 'O' && response[1] == 'K') { |
| 186 | if (usb_transport) { |
Benoit Goby | d592d6c | 2013-01-15 19:59:14 -0800 | [diff] [blame] | 187 | adb_auth_verified(usb_transport); |
Josh Gao | 7a8c7cb | 2016-02-23 18:05:57 -0800 | [diff] [blame^] | 188 | } |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 189 | } |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | void adb_auth_confirm_key(unsigned char *key, size_t len, atransport *t) |
| 194 | { |
Tamas Berghammer | a1c60c0 | 2015-07-13 19:12:28 +0100 | [diff] [blame] | 195 | char msg[MAX_PAYLOAD_V1]; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 196 | int ret; |
| 197 | |
Benoit Goby | c002888 | 2013-04-01 17:39:06 -0700 | [diff] [blame] | 198 | if (!usb_transport) { |
| 199 | usb_transport = t; |
Yabin Cui | 2d4c198 | 2015-08-28 15:09:44 -0700 | [diff] [blame] | 200 | t->AddDisconnect(&usb_disconnect); |
Benoit Goby | c002888 | 2013-04-01 17:39:06 -0700 | [diff] [blame] | 201 | } |
Benoit Goby | d592d6c | 2013-01-15 19:59:14 -0800 | [diff] [blame] | 202 | |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 203 | if (framework_fd < 0) { |
Yabin Cui | 815ad88 | 2015-09-02 17:44:28 -0700 | [diff] [blame] | 204 | D("Client not connected"); |
Benoit Goby | d592d6c | 2013-01-15 19:59:14 -0800 | [diff] [blame] | 205 | needs_retry = true; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 206 | return; |
| 207 | } |
| 208 | |
| 209 | if (key[len - 1] != '\0') { |
Yabin Cui | 815ad88 | 2015-09-02 17:44:28 -0700 | [diff] [blame] | 210 | D("Key must be a null-terminated string"); |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 211 | return; |
| 212 | } |
| 213 | |
| 214 | ret = snprintf(msg, sizeof(msg), "PK%s", key); |
| 215 | if (ret >= (signed)sizeof(msg)) { |
Yabin Cui | 815ad88 | 2015-09-02 17:44:28 -0700 | [diff] [blame] | 216 | D("Key too long. ret=%d", ret); |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 217 | return; |
| 218 | } |
Yabin Cui | 815ad88 | 2015-09-02 17:44:28 -0700 | [diff] [blame] | 219 | D("Sending '%s'", msg); |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 220 | |
| 221 | ret = unix_write(framework_fd, msg, ret); |
| 222 | if (ret < 0) { |
Yabin Cui | 815ad88 | 2015-09-02 17:44:28 -0700 | [diff] [blame] | 223 | D("Failed to write PK, errno=%d", errno); |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 224 | return; |
| 225 | } |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 226 | } |
| 227 | |
Josh Gao | 7a8c7cb | 2016-02-23 18:05:57 -0800 | [diff] [blame^] | 228 | static void adb_auth_listener(int fd, unsigned events, void* data) { |
Erik Kline | 3c8d44d | 2015-12-01 17:27:59 +0900 | [diff] [blame] | 229 | sockaddr_storage addr; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 230 | socklen_t alen; |
| 231 | int s; |
| 232 | |
| 233 | alen = sizeof(addr); |
| 234 | |
Erik Kline | 3c8d44d | 2015-12-01 17:27:59 +0900 | [diff] [blame] | 235 | s = adb_socket_accept(fd, reinterpret_cast<sockaddr*>(&addr), &alen); |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 236 | if (s < 0) { |
Yabin Cui | 815ad88 | 2015-09-02 17:44:28 -0700 | [diff] [blame] | 237 | D("Failed to accept: errno=%d", errno); |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 238 | return; |
| 239 | } |
| 240 | |
Josh Gao | 7a8c7cb | 2016-02-23 18:05:57 -0800 | [diff] [blame^] | 241 | if (framework_fd >= 0) { |
| 242 | PLOG(WARNING) << "adb received framework auth socket connection again"; |
| 243 | framework_disconnected(); |
| 244 | } |
| 245 | |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 246 | framework_fd = s; |
Josh Gao | 7a8c7cb | 2016-02-23 18:05:57 -0800 | [diff] [blame^] | 247 | fdevent_install(&framework_fde, framework_fd, adb_auth_event, nullptr); |
| 248 | fdevent_add(&framework_fde, FDE_READ); |
Benoit Goby | d592d6c | 2013-01-15 19:59:14 -0800 | [diff] [blame] | 249 | |
| 250 | if (needs_retry) { |
| 251 | needs_retry = false; |
| 252 | send_auth_request(usb_transport); |
| 253 | } |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 254 | } |
| 255 | |
Pavel Labath | 0bdb867 | 2015-03-17 11:03:36 -0700 | [diff] [blame] | 256 | void adbd_cloexec_auth_socket() { |
| 257 | int fd = android_get_control_socket("adbd"); |
| 258 | if (fd == -1) { |
Yabin Cui | 815ad88 | 2015-09-02 17:44:28 -0700 | [diff] [blame] | 259 | D("Failed to get adbd socket"); |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 260 | return; |
| 261 | } |
Nick Kralevich | 777523e | 2014-07-18 20:57:35 -0700 | [diff] [blame] | 262 | fcntl(fd, F_SETFD, FD_CLOEXEC); |
Pavel Labath | 0bdb867 | 2015-03-17 11:03:36 -0700 | [diff] [blame] | 263 | } |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 264 | |
Pavel Labath | 0bdb867 | 2015-03-17 11:03:36 -0700 | [diff] [blame] | 265 | void adbd_auth_init(void) { |
| 266 | int fd = android_get_control_socket("adbd"); |
| 267 | if (fd == -1) { |
Yabin Cui | 815ad88 | 2015-09-02 17:44:28 -0700 | [diff] [blame] | 268 | D("Failed to get adbd socket"); |
Pavel Labath | 0bdb867 | 2015-03-17 11:03:36 -0700 | [diff] [blame] | 269 | return; |
| 270 | } |
| 271 | |
| 272 | if (listen(fd, 4) == -1) { |
Yabin Cui | 815ad88 | 2015-09-02 17:44:28 -0700 | [diff] [blame] | 273 | D("Failed to listen on '%d'", fd); |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 274 | return; |
| 275 | } |
| 276 | |
| 277 | fdevent_install(&listener_fde, fd, adb_auth_listener, NULL); |
| 278 | fdevent_add(&listener_fde, FDE_READ); |
| 279 | } |