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 | |
Dan Albert | db6fe64 | 2015-03-19 15:21:08 -0700 | [diff] [blame^] | 17 | #define TRACE_TAG TRACE_AUTH |
| 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; |
| 47 | static int framework_fd = -1; |
| 48 | |
Benoit Goby | d592d6c | 2013-01-15 19:59:14 -0800 | [diff] [blame] | 49 | static void usb_disconnected(void* unused, atransport* t); |
| 50 | static struct adisconnect usb_disconnect = { usb_disconnected, 0, 0, 0 }; |
| 51 | static atransport* usb_transport; |
| 52 | static bool needs_retry = false; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 53 | |
| 54 | static void read_keys(const char *file, struct listnode *list) |
| 55 | { |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 56 | FILE *f; |
| 57 | char buf[MAX_PAYLOAD]; |
| 58 | char *sep; |
| 59 | int ret; |
| 60 | |
Nick Kralevich | 777523e | 2014-07-18 20:57:35 -0700 | [diff] [blame] | 61 | f = fopen(file, "re"); |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 62 | if (!f) { |
| 63 | D("Can't open '%s'\n", file); |
| 64 | return; |
| 65 | } |
| 66 | |
| 67 | while (fgets(buf, sizeof(buf), f)) { |
| 68 | /* Allocate 4 extra bytes to decode the base64 data in-place */ |
Dan Albert | f30d73c | 2015-02-25 17:51:28 -0800 | [diff] [blame] | 69 | auto key = reinterpret_cast<adb_public_key*>( |
| 70 | calloc(1, sizeof(adb_public_key) + 4)); |
| 71 | if (key == nullptr) { |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 72 | D("Can't malloc key\n"); |
| 73 | break; |
| 74 | } |
| 75 | |
| 76 | sep = strpbrk(buf, " \t"); |
| 77 | if (sep) |
| 78 | *sep = '\0'; |
| 79 | |
| 80 | ret = __b64_pton(buf, (u_char *)&key->key, sizeof(key->key) + 4); |
| 81 | if (ret != sizeof(key->key)) { |
| 82 | D("%s: Invalid base64 data ret=%d\n", file, ret); |
| 83 | free(key); |
| 84 | continue; |
| 85 | } |
| 86 | |
| 87 | if (key->key.len != RSANUMWORDS) { |
| 88 | D("%s: Invalid key len %d\n", file, key->key.len); |
| 89 | free(key); |
| 90 | continue; |
| 91 | } |
| 92 | |
| 93 | list_add_tail(list, &key->node); |
| 94 | } |
| 95 | |
| 96 | fclose(f); |
| 97 | } |
| 98 | |
| 99 | static void free_keys(struct listnode *list) |
| 100 | { |
| 101 | struct listnode *item; |
| 102 | |
| 103 | while (!list_empty(list)) { |
| 104 | item = list_head(list); |
| 105 | list_remove(item); |
| 106 | free(node_to_item(item, struct adb_public_key, node)); |
| 107 | } |
| 108 | } |
| 109 | |
Benoit Goby | d84bc66 | 2013-01-14 21:26:30 -0800 | [diff] [blame] | 110 | static void load_keys(struct listnode *list) |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 111 | { |
Dan Albert | f30d73c | 2015-02-25 17:51:28 -0800 | [diff] [blame] | 112 | const char* path; |
| 113 | const char** paths = key_paths; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 114 | struct stat buf; |
| 115 | |
Benoit Goby | d84bc66 | 2013-01-14 21:26:30 -0800 | [diff] [blame] | 116 | list_init(list); |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 117 | |
| 118 | while ((path = *paths++)) { |
| 119 | if (!stat(path, &buf)) { |
| 120 | D("Loading keys from '%s'\n", path); |
Benoit Goby | d84bc66 | 2013-01-14 21:26:30 -0800 | [diff] [blame] | 121 | read_keys(path, list); |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 122 | } |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | int adb_auth_generate_token(void *token, size_t token_size) |
| 127 | { |
| 128 | FILE *f; |
| 129 | int ret; |
| 130 | |
Nick Kralevich | 777523e | 2014-07-18 20:57:35 -0700 | [diff] [blame] | 131 | f = fopen("/dev/urandom", "re"); |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 132 | if (!f) |
| 133 | return 0; |
| 134 | |
| 135 | ret = fread(token, token_size, 1, f); |
| 136 | |
| 137 | fclose(f); |
| 138 | return ret * token_size; |
| 139 | } |
| 140 | |
Dan Albert | f30d73c | 2015-02-25 17:51:28 -0800 | [diff] [blame] | 141 | int adb_auth_verify(uint8_t* token, uint8_t* sig, int siglen) |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 142 | { |
| 143 | struct listnode *item; |
Benoit Goby | d84bc66 | 2013-01-14 21:26:30 -0800 | [diff] [blame] | 144 | struct listnode key_list; |
| 145 | int ret = 0; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 146 | |
| 147 | if (siglen != RSANUMBYTES) |
| 148 | return 0; |
| 149 | |
Benoit Goby | d84bc66 | 2013-01-14 21:26:30 -0800 | [diff] [blame] | 150 | load_keys(&key_list); |
| 151 | |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 152 | list_for_each(item, &key_list) { |
Dan Albert | f30d73c | 2015-02-25 17:51:28 -0800 | [diff] [blame] | 153 | 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] | 154 | ret = RSA_verify(&key->key, sig, siglen, token, SHA_DIGEST_SIZE); |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 155 | if (ret) |
Benoit Goby | d84bc66 | 2013-01-14 21:26:30 -0800 | [diff] [blame] | 156 | break; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 157 | } |
| 158 | |
Benoit Goby | d84bc66 | 2013-01-14 21:26:30 -0800 | [diff] [blame] | 159 | free_keys(&key_list); |
| 160 | |
| 161 | return ret; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 162 | } |
| 163 | |
Benoit Goby | d592d6c | 2013-01-15 19:59:14 -0800 | [diff] [blame] | 164 | static void usb_disconnected(void* unused, atransport* t) |
| 165 | { |
Benoit Goby | c002888 | 2013-04-01 17:39:06 -0700 | [diff] [blame] | 166 | D("USB disconnect\n"); |
Benoit Goby | d592d6c | 2013-01-15 19:59:14 -0800 | [diff] [blame] | 167 | remove_transport_disconnect(usb_transport, &usb_disconnect); |
| 168 | usb_transport = NULL; |
| 169 | needs_retry = false; |
| 170 | } |
| 171 | |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 172 | static void adb_auth_event(int fd, unsigned events, void *data) |
| 173 | { |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 174 | char response[2]; |
| 175 | int ret; |
| 176 | |
| 177 | if (events & FDE_READ) { |
| 178 | ret = unix_read(fd, response, sizeof(response)); |
Vince Harron | 8212542 | 2014-09-25 21:51:15 -0700 | [diff] [blame] | 179 | if (ret <= 0) { |
Benoit Goby | c002888 | 2013-04-01 17:39:06 -0700 | [diff] [blame] | 180 | D("Framework disconnect\n"); |
Benoit Goby | d592d6c | 2013-01-15 19:59:14 -0800 | [diff] [blame] | 181 | if (usb_transport) |
| 182 | fdevent_remove(&usb_transport->auth_fde); |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 183 | framework_fd = -1; |
| 184 | } |
| 185 | else if (ret == 2 && response[0] == 'O' && response[1] == 'K') { |
Benoit Goby | d592d6c | 2013-01-15 19:59:14 -0800 | [diff] [blame] | 186 | if (usb_transport) |
| 187 | adb_auth_verified(usb_transport); |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 188 | } |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | void adb_auth_confirm_key(unsigned char *key, size_t len, atransport *t) |
| 193 | { |
| 194 | char msg[MAX_PAYLOAD]; |
| 195 | int ret; |
| 196 | |
Benoit Goby | c002888 | 2013-04-01 17:39:06 -0700 | [diff] [blame] | 197 | if (!usb_transport) { |
| 198 | usb_transport = t; |
| 199 | add_transport_disconnect(t, &usb_disconnect); |
| 200 | } |
Benoit Goby | d592d6c | 2013-01-15 19:59:14 -0800 | [diff] [blame] | 201 | |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 202 | if (framework_fd < 0) { |
| 203 | D("Client not connected\n"); |
Benoit Goby | d592d6c | 2013-01-15 19:59:14 -0800 | [diff] [blame] | 204 | needs_retry = true; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 205 | return; |
| 206 | } |
| 207 | |
| 208 | if (key[len - 1] != '\0') { |
| 209 | D("Key must be a null-terminated string\n"); |
| 210 | return; |
| 211 | } |
| 212 | |
| 213 | ret = snprintf(msg, sizeof(msg), "PK%s", key); |
| 214 | if (ret >= (signed)sizeof(msg)) { |
| 215 | D("Key too long. ret=%d", ret); |
| 216 | return; |
| 217 | } |
| 218 | D("Sending '%s'\n", msg); |
| 219 | |
| 220 | ret = unix_write(framework_fd, msg, ret); |
| 221 | if (ret < 0) { |
| 222 | D("Failed to write PK, errno=%d\n", errno); |
| 223 | return; |
| 224 | } |
| 225 | |
| 226 | fdevent_install(&t->auth_fde, framework_fd, adb_auth_event, t); |
| 227 | fdevent_add(&t->auth_fde, FDE_READ); |
| 228 | } |
| 229 | |
| 230 | static void adb_auth_listener(int fd, unsigned events, void *data) |
| 231 | { |
| 232 | struct sockaddr addr; |
| 233 | socklen_t alen; |
| 234 | int s; |
| 235 | |
| 236 | alen = sizeof(addr); |
| 237 | |
| 238 | s = adb_socket_accept(fd, &addr, &alen); |
| 239 | if (s < 0) { |
| 240 | D("Failed to accept: errno=%d\n", errno); |
| 241 | return; |
| 242 | } |
| 243 | |
| 244 | framework_fd = s; |
Benoit Goby | d592d6c | 2013-01-15 19:59:14 -0800 | [diff] [blame] | 245 | |
| 246 | if (needs_retry) { |
| 247 | needs_retry = false; |
| 248 | send_auth_request(usb_transport); |
| 249 | } |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 250 | } |
| 251 | |
Pavel Labath | 0bdb867 | 2015-03-17 11:03:36 -0700 | [diff] [blame] | 252 | void adbd_cloexec_auth_socket() { |
| 253 | int fd = android_get_control_socket("adbd"); |
| 254 | if (fd == -1) { |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 255 | D("Failed to get adbd socket\n"); |
| 256 | return; |
| 257 | } |
Nick Kralevich | 777523e | 2014-07-18 20:57:35 -0700 | [diff] [blame] | 258 | fcntl(fd, F_SETFD, FD_CLOEXEC); |
Pavel Labath | 0bdb867 | 2015-03-17 11:03:36 -0700 | [diff] [blame] | 259 | } |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 260 | |
Pavel Labath | 0bdb867 | 2015-03-17 11:03:36 -0700 | [diff] [blame] | 261 | void adbd_auth_init(void) { |
| 262 | int fd = android_get_control_socket("adbd"); |
| 263 | if (fd == -1) { |
| 264 | D("Failed to get adbd socket\n"); |
| 265 | return; |
| 266 | } |
| 267 | |
| 268 | if (listen(fd, 4) == -1) { |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 269 | D("Failed to listen on '%d'\n", fd); |
| 270 | return; |
| 271 | } |
| 272 | |
| 273 | fdevent_install(&listener_fde, fd, adb_auth_listener, NULL); |
| 274 | fdevent_add(&listener_fde, FDE_READ); |
| 275 | } |