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 | |
Elliott Hughes | 801066a | 2016-06-29 17:42:01 -0700 | [diff] [blame^] | 19 | #include "adb.h" |
Dan Albert | db6fe64 | 2015-03-19 15:21:08 -0700 | [diff] [blame] | 20 | #include "adb_auth.h" |
Elliott Hughes | 801066a | 2016-06-29 17:42:01 -0700 | [diff] [blame^] | 21 | #include "fdevent.h" |
| 22 | #include "sysdeps.h" |
| 23 | #include "transport.h" |
Dan Albert | db6fe64 | 2015-03-19 15:21:08 -0700 | [diff] [blame] | 24 | |
Dan Albert | b302d12 | 2015-02-24 15:51:19 -0800 | [diff] [blame] | 25 | #include <resolv.h> |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 26 | #include <stdio.h> |
| 27 | #include <string.h> |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 28 | |
Elliott Hughes | 801066a | 2016-06-29 17:42:01 -0700 | [diff] [blame^] | 29 | #include <memory> |
| 30 | |
| 31 | #include <android-base/file.h> |
| 32 | #include <android-base/strings.h> |
| 33 | #include <crypto_utils/android_pubkey.h> |
Mattias Nissler | a947b49 | 2016-03-31 16:32:09 +0200 | [diff] [blame] | 34 | #include <openssl/obj_mac.h> |
| 35 | #include <openssl/rsa.h> |
| 36 | #include <openssl/sha.h> |
| 37 | |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 38 | static fdevent listener_fde; |
Josh Gao | 7a8c7cb | 2016-02-23 18:05:57 -0800 | [diff] [blame] | 39 | static fdevent framework_fde; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 40 | static int framework_fd = -1; |
| 41 | |
Benoit Goby | d592d6c | 2013-01-15 19:59:14 -0800 | [diff] [blame] | 42 | static void usb_disconnected(void* unused, atransport* t); |
Yabin Cui | 2d4c198 | 2015-08-28 15:09:44 -0700 | [diff] [blame] | 43 | static struct adisconnect usb_disconnect = { usb_disconnected, nullptr}; |
Benoit Goby | d592d6c | 2013-01-15 19:59:14 -0800 | [diff] [blame] | 44 | static atransport* usb_transport; |
| 45 | static bool needs_retry = false; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 46 | |
Elliott Hughes | 801066a | 2016-06-29 17:42:01 -0700 | [diff] [blame^] | 47 | bool adb_auth_verify(uint8_t* token, size_t token_size, uint8_t* sig, int sig_len) { |
| 48 | static constexpr const char* key_paths[] = { "/adb_keys", "/data/misc/adb/adb_keys", nullptr }; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 49 | |
Elliott Hughes | 801066a | 2016-06-29 17:42:01 -0700 | [diff] [blame^] | 50 | for (const auto& path : key_paths) { |
| 51 | if (access(path, R_OK) == 0) { |
| 52 | LOG(INFO) << "Loading keys from " << path; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 53 | |
Elliott Hughes | 801066a | 2016-06-29 17:42:01 -0700 | [diff] [blame^] | 54 | std::string content; |
| 55 | if (!android::base::ReadFileToString(path, &content)) { |
| 56 | PLOG(ERROR) << "Couldn't read " << path; |
| 57 | continue; |
| 58 | } |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 59 | |
Elliott Hughes | 801066a | 2016-06-29 17:42:01 -0700 | [diff] [blame^] | 60 | for (const auto& line : android::base::Split(content, "\n")) { |
| 61 | // TODO: do we really have to support both ' ' and '\t'? |
| 62 | char* sep = strpbrk(const_cast<char*>(line.c_str()), " \t"); |
| 63 | if (sep) *sep = '\0'; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 64 | |
Elliott Hughes | 801066a | 2016-06-29 17:42:01 -0700 | [diff] [blame^] | 65 | // b64_pton requires one additional byte in the target buffer for |
| 66 | // decoding to succeed. See http://b/28035006 for details. |
| 67 | uint8_t keybuf[ANDROID_PUBKEY_ENCODED_SIZE + 1]; |
| 68 | if (__b64_pton(line.c_str(), keybuf, sizeof(keybuf)) != ANDROID_PUBKEY_ENCODED_SIZE) { |
| 69 | LOG(ERROR) << "Invalid base64 key " << line.c_str() << " in " << path; |
| 70 | continue; |
| 71 | } |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 72 | |
Elliott Hughes | 801066a | 2016-06-29 17:42:01 -0700 | [diff] [blame^] | 73 | RSA* key = nullptr; |
| 74 | if (!android_pubkey_decode(keybuf, ANDROID_PUBKEY_ENCODED_SIZE, &key)) { |
| 75 | LOG(ERROR) << "Failed to parse key " << line.c_str() << " in " << path; |
| 76 | continue; |
| 77 | } |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 78 | |
Elliott Hughes | 801066a | 2016-06-29 17:42:01 -0700 | [diff] [blame^] | 79 | bool verified = (RSA_verify(NID_sha1, token, token_size, sig, sig_len, key) == 1); |
| 80 | RSA_free(key); |
| 81 | if (verified) return true; |
| 82 | } |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 83 | } |
| 84 | } |
Elliott Hughes | 801066a | 2016-06-29 17:42:01 -0700 | [diff] [blame^] | 85 | return false; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 86 | } |
| 87 | |
Elliott Hughes | 801066a | 2016-06-29 17:42:01 -0700 | [diff] [blame^] | 88 | bool adb_auth_generate_token(void* token, size_t token_size) { |
| 89 | FILE* fp = fopen("/dev/urandom", "re"); |
| 90 | if (!fp) return false; |
| 91 | bool okay = (fread(token, token_size, 1, fp) == 1); |
| 92 | fclose(fp); |
| 93 | return okay; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 94 | } |
| 95 | |
Josh Gao | 7a8c7cb | 2016-02-23 18:05:57 -0800 | [diff] [blame] | 96 | static void usb_disconnected(void* unused, atransport* t) { |
Elliott Hughes | 801066a | 2016-06-29 17:42:01 -0700 | [diff] [blame^] | 97 | LOG(INFO) << "USB disconnect"; |
Benoit Goby | d592d6c | 2013-01-15 19:59:14 -0800 | [diff] [blame] | 98 | usb_transport = NULL; |
| 99 | needs_retry = false; |
| 100 | } |
| 101 | |
Josh Gao | 7a8c7cb | 2016-02-23 18:05:57 -0800 | [diff] [blame] | 102 | static void framework_disconnected() { |
Elliott Hughes | 801066a | 2016-06-29 17:42:01 -0700 | [diff] [blame^] | 103 | LOG(INFO) << "Framework disconnect"; |
Josh Gao | 7a8c7cb | 2016-02-23 18:05:57 -0800 | [diff] [blame] | 104 | fdevent_remove(&framework_fde); |
| 105 | framework_fd = -1; |
| 106 | } |
| 107 | |
| 108 | static void adb_auth_event(int fd, unsigned events, void*) { |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 109 | if (events & FDE_READ) { |
Elliott Hughes | 801066a | 2016-06-29 17:42:01 -0700 | [diff] [blame^] | 110 | char response[2]; |
| 111 | int ret = unix_read(fd, response, sizeof(response)); |
Vince Harron | 8212542 | 2014-09-25 21:51:15 -0700 | [diff] [blame] | 112 | if (ret <= 0) { |
Josh Gao | 7a8c7cb | 2016-02-23 18:05:57 -0800 | [diff] [blame] | 113 | framework_disconnected(); |
| 114 | } else if (ret == 2 && response[0] == 'O' && response[1] == 'K') { |
| 115 | if (usb_transport) { |
Benoit Goby | d592d6c | 2013-01-15 19:59:14 -0800 | [diff] [blame] | 116 | adb_auth_verified(usb_transport); |
Josh Gao | 7a8c7cb | 2016-02-23 18:05:57 -0800 | [diff] [blame] | 117 | } |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 118 | } |
| 119 | } |
| 120 | } |
| 121 | |
Elliott Hughes | 801066a | 2016-06-29 17:42:01 -0700 | [diff] [blame^] | 122 | void adb_auth_confirm_key(unsigned char* key, size_t len, atransport* t) { |
Benoit Goby | c002888 | 2013-04-01 17:39:06 -0700 | [diff] [blame] | 123 | if (!usb_transport) { |
| 124 | usb_transport = t; |
Yabin Cui | 2d4c198 | 2015-08-28 15:09:44 -0700 | [diff] [blame] | 125 | t->AddDisconnect(&usb_disconnect); |
Benoit Goby | c002888 | 2013-04-01 17:39:06 -0700 | [diff] [blame] | 126 | } |
Benoit Goby | d592d6c | 2013-01-15 19:59:14 -0800 | [diff] [blame] | 127 | |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 128 | if (framework_fd < 0) { |
Elliott Hughes | 801066a | 2016-06-29 17:42:01 -0700 | [diff] [blame^] | 129 | LOG(ERROR) << "Client not connected"; |
Benoit Goby | d592d6c | 2013-01-15 19:59:14 -0800 | [diff] [blame] | 130 | needs_retry = true; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 131 | return; |
| 132 | } |
| 133 | |
| 134 | if (key[len - 1] != '\0') { |
Elliott Hughes | 801066a | 2016-06-29 17:42:01 -0700 | [diff] [blame^] | 135 | LOG(ERROR) << "Key must be a null-terminated string"; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 136 | return; |
| 137 | } |
| 138 | |
Elliott Hughes | 801066a | 2016-06-29 17:42:01 -0700 | [diff] [blame^] | 139 | char msg[MAX_PAYLOAD_V1]; |
| 140 | int msg_len = snprintf(msg, sizeof(msg), "PK%s", key); |
| 141 | if (msg_len >= static_cast<int>(sizeof(msg))) { |
| 142 | LOG(ERROR) << "Key too long (" << msg_len << ")"; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 143 | return; |
| 144 | } |
Elliott Hughes | 801066a | 2016-06-29 17:42:01 -0700 | [diff] [blame^] | 145 | LOG(DEBUG) << "Sending '" << msg << "'"; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 146 | |
Elliott Hughes | 801066a | 2016-06-29 17:42:01 -0700 | [diff] [blame^] | 147 | if (unix_write(framework_fd, msg, msg_len) == -1) { |
| 148 | PLOG(ERROR) << "Failed to write PK"; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 149 | return; |
| 150 | } |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 151 | } |
| 152 | |
Josh Gao | 7a8c7cb | 2016-02-23 18:05:57 -0800 | [diff] [blame] | 153 | static void adb_auth_listener(int fd, unsigned events, void* data) { |
Erik Kline | 3c8d44d | 2015-12-01 17:27:59 +0900 | [diff] [blame] | 154 | sockaddr_storage addr; |
Elliott Hughes | 801066a | 2016-06-29 17:42:01 -0700 | [diff] [blame^] | 155 | socklen_t alen = sizeof(addr); |
| 156 | int s = adb_socket_accept(fd, reinterpret_cast<sockaddr*>(&addr), &alen); |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 157 | if (s < 0) { |
Elliott Hughes | 801066a | 2016-06-29 17:42:01 -0700 | [diff] [blame^] | 158 | PLOG(ERROR) << "Failed to accept"; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 159 | return; |
| 160 | } |
| 161 | |
Josh Gao | 7a8c7cb | 2016-02-23 18:05:57 -0800 | [diff] [blame] | 162 | if (framework_fd >= 0) { |
Josh Gao | 5ca49db | 2016-02-25 14:11:32 -0800 | [diff] [blame] | 163 | LOG(WARNING) << "adb received framework auth socket connection again"; |
Josh Gao | 7a8c7cb | 2016-02-23 18:05:57 -0800 | [diff] [blame] | 164 | framework_disconnected(); |
| 165 | } |
| 166 | |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 167 | framework_fd = s; |
Josh Gao | 7a8c7cb | 2016-02-23 18:05:57 -0800 | [diff] [blame] | 168 | fdevent_install(&framework_fde, framework_fd, adb_auth_event, nullptr); |
| 169 | fdevent_add(&framework_fde, FDE_READ); |
Benoit Goby | d592d6c | 2013-01-15 19:59:14 -0800 | [diff] [blame] | 170 | |
| 171 | if (needs_retry) { |
| 172 | needs_retry = false; |
| 173 | send_auth_request(usb_transport); |
| 174 | } |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 175 | } |
| 176 | |
Pavel Labath | 0bdb867 | 2015-03-17 11:03:36 -0700 | [diff] [blame] | 177 | void adbd_cloexec_auth_socket() { |
| 178 | int fd = android_get_control_socket("adbd"); |
| 179 | if (fd == -1) { |
Elliott Hughes | 801066a | 2016-06-29 17:42:01 -0700 | [diff] [blame^] | 180 | PLOG(ERROR) << "Failed to get adbd socket"; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 181 | return; |
| 182 | } |
Nick Kralevich | 777523e | 2014-07-18 20:57:35 -0700 | [diff] [blame] | 183 | fcntl(fd, F_SETFD, FD_CLOEXEC); |
Pavel Labath | 0bdb867 | 2015-03-17 11:03:36 -0700 | [diff] [blame] | 184 | } |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 185 | |
Pavel Labath | 0bdb867 | 2015-03-17 11:03:36 -0700 | [diff] [blame] | 186 | void adbd_auth_init(void) { |
| 187 | int fd = android_get_control_socket("adbd"); |
| 188 | if (fd == -1) { |
Elliott Hughes | 801066a | 2016-06-29 17:42:01 -0700 | [diff] [blame^] | 189 | PLOG(ERROR) << "Failed to get adbd socket"; |
Pavel Labath | 0bdb867 | 2015-03-17 11:03:36 -0700 | [diff] [blame] | 190 | return; |
| 191 | } |
| 192 | |
| 193 | if (listen(fd, 4) == -1) { |
Elliott Hughes | 801066a | 2016-06-29 17:42:01 -0700 | [diff] [blame^] | 194 | PLOG(ERROR) << "Failed to listen on '" << fd << "'"; |
Benoit Goby | 2cc19e4 | 2012-04-12 12:23:49 -0700 | [diff] [blame] | 195 | return; |
| 196 | } |
| 197 | |
| 198 | fdevent_install(&listener_fde, fd, adb_auth_listener, NULL); |
| 199 | fdevent_add(&listener_fde, FDE_READ); |
| 200 | } |