Paul Lawrence | d0b4295 | 2015-06-03 14:19:51 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 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 | |
| 17 | #include <stdlib.h> |
| 18 | #include <sys/socket.h> |
| 19 | #include <sys/types.h> |
| 20 | #include <netinet/in.h> |
| 21 | #include <arpa/inet.h> |
| 22 | #include <dirent.h> |
| 23 | #include <errno.h> |
| 24 | #include <fcntl.h> |
| 25 | #include <fs_mgr.h> |
| 26 | #include <stdio.h> |
| 27 | #include <string.h> |
| 28 | #include <stdint.h> |
| 29 | #include <inttypes.h> |
| 30 | |
| 31 | #define LOG_TAG "VoldCryptCmdListener" |
| 32 | |
| 33 | #include <base/stringprintf.h> |
| 34 | #include <cutils/fs.h> |
| 35 | #include <cutils/log.h> |
| 36 | #include <cutils/sockets.h> |
| 37 | |
| 38 | #include <sysutils/SocketClient.h> |
| 39 | #include <private/android_filesystem_config.h> |
| 40 | |
| 41 | #include "CryptCommandListener.h" |
| 42 | #include "Process.h" |
| 43 | #include "ResponseCode.h" |
| 44 | #include "cryptfs.h" |
| 45 | |
| 46 | #define DUMP_ARGS 0 |
| 47 | |
| 48 | CryptCommandListener::CryptCommandListener() : |
| 49 | FrameworkListener("cryptd", true) { |
| 50 | registerCmd(new CryptfsCmd()); |
| 51 | } |
| 52 | |
| 53 | #if DUMP_ARGS |
| 54 | void CryptCommandListener::dumpArgs(int argc, char **argv, int argObscure) { |
| 55 | char buffer[4096]; |
| 56 | char *p = buffer; |
| 57 | |
| 58 | memset(buffer, 0, sizeof(buffer)); |
| 59 | int i; |
| 60 | for (i = 0; i < argc; i++) { |
| 61 | unsigned int len = strlen(argv[i]) + 1; // Account for space |
| 62 | if (i == argObscure) { |
| 63 | len += 2; // Account for {} |
| 64 | } |
| 65 | if (((p - buffer) + len) < (sizeof(buffer)-1)) { |
| 66 | if (i == argObscure) { |
| 67 | *p++ = '{'; |
| 68 | *p++ = '}'; |
| 69 | *p++ = ' '; |
| 70 | continue; |
| 71 | } |
| 72 | strcpy(p, argv[i]); |
| 73 | p+= strlen(argv[i]); |
| 74 | if (i != (argc -1)) { |
| 75 | *p++ = ' '; |
| 76 | } |
| 77 | } |
| 78 | } |
| 79 | SLOGD("%s", buffer); |
| 80 | } |
| 81 | #else |
| 82 | void CryptCommandListener::dumpArgs(int /*argc*/, char ** /*argv*/, int /*argObscure*/) { } |
| 83 | #endif |
| 84 | |
| 85 | int CryptCommandListener::sendGenericOkFail(SocketClient *cli, int cond) { |
| 86 | if (!cond) { |
| 87 | return cli->sendMsg(ResponseCode::CommandOkay, "Command succeeded", false); |
| 88 | } else { |
| 89 | return cli->sendMsg(ResponseCode::OperationFailed, "Command failed", false); |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | CryptCommandListener::CryptfsCmd::CryptfsCmd() : |
| 94 | VoldCommand("cryptfs") { |
| 95 | } |
| 96 | |
| 97 | static int getType(const char* type) |
| 98 | { |
| 99 | if (!strcmp(type, "default")) { |
| 100 | return CRYPT_TYPE_DEFAULT; |
| 101 | } else if (!strcmp(type, "password")) { |
| 102 | return CRYPT_TYPE_PASSWORD; |
| 103 | } else if (!strcmp(type, "pin")) { |
| 104 | return CRYPT_TYPE_PIN; |
| 105 | } else if (!strcmp(type, "pattern")) { |
| 106 | return CRYPT_TYPE_PATTERN; |
| 107 | } else { |
| 108 | return -1; |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | int CryptCommandListener::CryptfsCmd::runCommand(SocketClient *cli, |
| 113 | int argc, char **argv) { |
| 114 | if ((cli->getUid() != 0) && (cli->getUid() != AID_SYSTEM)) { |
| 115 | cli->sendMsg(ResponseCode::CommandNoPermission, "No permission to run cryptfs commands", false); |
| 116 | return 0; |
| 117 | } |
| 118 | |
| 119 | if (argc < 2) { |
| 120 | cli->sendMsg(ResponseCode::CommandSyntaxError, "Missing Argument", false); |
| 121 | return 0; |
| 122 | } |
| 123 | |
| 124 | int rc = 0; |
| 125 | |
| 126 | if (!strcmp(argv[1], "checkpw")) { |
| 127 | if (argc != 3) { |
| 128 | cli->sendMsg(ResponseCode::CommandSyntaxError, "Usage: cryptfs checkpw <passwd>", false); |
| 129 | return 0; |
| 130 | } |
| 131 | dumpArgs(argc, argv, 2); |
| 132 | rc = cryptfs_check_passwd(argv[2]); |
| 133 | } else if (!strcmp(argv[1], "restart")) { |
| 134 | if (argc != 2) { |
| 135 | cli->sendMsg(ResponseCode::CommandSyntaxError, "Usage: cryptfs restart", false); |
| 136 | return 0; |
| 137 | } |
| 138 | dumpArgs(argc, argv, -1); |
| 139 | rc = cryptfs_restart(); |
| 140 | } else if (!strcmp(argv[1], "cryptocomplete")) { |
| 141 | if (argc != 2) { |
| 142 | cli->sendMsg(ResponseCode::CommandSyntaxError, "Usage: cryptfs cryptocomplete", false); |
| 143 | return 0; |
| 144 | } |
| 145 | dumpArgs(argc, argv, -1); |
| 146 | rc = cryptfs_crypto_complete(); |
| 147 | } else if (!strcmp(argv[1], "enablecrypto")) { |
| 148 | const char* syntax = "Usage: cryptfs enablecrypto <wipe|inplace> " |
| 149 | "default|password|pin|pattern [passwd]"; |
| 150 | if ( (argc != 4 && argc != 5) |
| 151 | || (strcmp(argv[2], "wipe") && strcmp(argv[2], "inplace")) ) { |
| 152 | cli->sendMsg(ResponseCode::CommandSyntaxError, syntax, false); |
| 153 | return 0; |
| 154 | } |
| 155 | dumpArgs(argc, argv, 4); |
| 156 | |
| 157 | int tries; |
| 158 | for (tries = 0; tries < 2; ++tries) { |
| 159 | int type = getType(argv[3]); |
| 160 | if (type == -1) { |
| 161 | cli->sendMsg(ResponseCode::CommandSyntaxError, syntax, |
| 162 | false); |
| 163 | return 0; |
| 164 | } else if (type == CRYPT_TYPE_DEFAULT) { |
| 165 | rc = cryptfs_enable_default(argv[2], /*allow_reboot*/false); |
| 166 | } else { |
| 167 | rc = cryptfs_enable(argv[2], type, argv[4], |
| 168 | /*allow_reboot*/false); |
| 169 | } |
| 170 | |
| 171 | if (rc == 0) { |
| 172 | break; |
| 173 | } else if (tries == 0) { |
| 174 | Process::killProcessesWithOpenFiles(DATA_MNT_POINT, SIGKILL); |
| 175 | } |
| 176 | } |
| 177 | } else if (!strcmp(argv[1], "enablefilecrypto")) { |
| 178 | const char* syntax = "Usage: cryptfs enablefilecrypto"; |
| 179 | if (argc != 2) { |
| 180 | cli->sendMsg(ResponseCode::CommandSyntaxError, syntax, false); |
| 181 | return 0; |
| 182 | } |
| 183 | dumpArgs(argc, argv, -1); |
| 184 | rc = cryptfs_enable_file(); |
| 185 | } else if (!strcmp(argv[1], "changepw")) { |
| 186 | const char* syntax = "Usage: cryptfs changepw " |
| 187 | "default|password|pin|pattern [newpasswd]"; |
| 188 | const char* password; |
| 189 | if (argc == 3) { |
| 190 | password = ""; |
| 191 | } else if (argc == 4) { |
| 192 | password = argv[3]; |
| 193 | } else { |
| 194 | cli->sendMsg(ResponseCode::CommandSyntaxError, syntax, false); |
| 195 | return 0; |
| 196 | } |
| 197 | int type = getType(argv[2]); |
| 198 | if (type == -1) { |
| 199 | cli->sendMsg(ResponseCode::CommandSyntaxError, syntax, false); |
| 200 | return 0; |
| 201 | } |
| 202 | SLOGD("cryptfs changepw %s {}", argv[2]); |
| 203 | rc = cryptfs_changepw(type, password); |
| 204 | } else if (!strcmp(argv[1], "verifypw")) { |
| 205 | if (argc != 3) { |
| 206 | cli->sendMsg(ResponseCode::CommandSyntaxError, "Usage: cryptfs verifypw <passwd>", false); |
| 207 | return 0; |
| 208 | } |
| 209 | SLOGD("cryptfs verifypw {}"); |
| 210 | rc = cryptfs_verify_passwd(argv[2]); |
| 211 | } else if (!strcmp(argv[1], "getfield")) { |
| 212 | char *valbuf; |
| 213 | int valbuf_len = PROPERTY_VALUE_MAX; |
| 214 | |
| 215 | if (argc != 3) { |
| 216 | cli->sendMsg(ResponseCode::CommandSyntaxError, "Usage: cryptfs getfield <fieldname>", false); |
| 217 | return 0; |
| 218 | } |
| 219 | dumpArgs(argc, argv, -1); |
| 220 | |
| 221 | // Increase the buffer size until it is big enough for the field value stored. |
| 222 | while (1) { |
| 223 | valbuf = (char*)malloc(valbuf_len); |
| 224 | if (valbuf == NULL) { |
| 225 | cli->sendMsg(ResponseCode::OperationFailed, "Failed to allocate memory", false); |
| 226 | return 0; |
| 227 | } |
| 228 | rc = cryptfs_getfield(argv[2], valbuf, valbuf_len); |
| 229 | if (rc != CRYPTO_GETFIELD_ERROR_BUF_TOO_SMALL) { |
| 230 | break; |
| 231 | } |
| 232 | free(valbuf); |
| 233 | valbuf_len *= 2; |
| 234 | } |
| 235 | if (rc == CRYPTO_GETFIELD_OK) { |
| 236 | cli->sendMsg(ResponseCode::CryptfsGetfieldResult, valbuf, false); |
| 237 | } |
| 238 | free(valbuf); |
| 239 | } else if (!strcmp(argv[1], "setfield")) { |
| 240 | if (argc != 4) { |
| 241 | cli->sendMsg(ResponseCode::CommandSyntaxError, "Usage: cryptfs setfield <fieldname> <value>", false); |
| 242 | return 0; |
| 243 | } |
| 244 | dumpArgs(argc, argv, -1); |
| 245 | rc = cryptfs_setfield(argv[2], argv[3]); |
| 246 | } else if (!strcmp(argv[1], "mountdefaultencrypted")) { |
| 247 | SLOGD("cryptfs mountdefaultencrypted"); |
| 248 | dumpArgs(argc, argv, -1); |
| 249 | rc = cryptfs_mount_default_encrypted(); |
| 250 | } else if (!strcmp(argv[1], "getpwtype")) { |
| 251 | SLOGD("cryptfs getpwtype"); |
| 252 | dumpArgs(argc, argv, -1); |
| 253 | switch(cryptfs_get_password_type()) { |
| 254 | case CRYPT_TYPE_PASSWORD: |
| 255 | cli->sendMsg(ResponseCode::PasswordTypeResult, "password", false); |
| 256 | return 0; |
| 257 | case CRYPT_TYPE_PATTERN: |
| 258 | cli->sendMsg(ResponseCode::PasswordTypeResult, "pattern", false); |
| 259 | return 0; |
| 260 | case CRYPT_TYPE_PIN: |
| 261 | cli->sendMsg(ResponseCode::PasswordTypeResult, "pin", false); |
| 262 | return 0; |
| 263 | case CRYPT_TYPE_DEFAULT: |
| 264 | cli->sendMsg(ResponseCode::PasswordTypeResult, "default", false); |
| 265 | return 0; |
| 266 | default: |
| 267 | /** @TODO better error and make sure handled by callers */ |
| 268 | cli->sendMsg(ResponseCode::OpFailedStorageNotFound, "Error", false); |
| 269 | return 0; |
| 270 | } |
| 271 | } else if (!strcmp(argv[1], "getpw")) { |
| 272 | SLOGD("cryptfs getpw"); |
| 273 | dumpArgs(argc, argv, -1); |
| 274 | const char* password = cryptfs_get_password(); |
| 275 | if (password) { |
| 276 | char* message = 0; |
| 277 | int size = asprintf(&message, "{{sensitive}} %s", password); |
| 278 | if (size != -1) { |
| 279 | cli->sendMsg(ResponseCode::CommandOkay, message, false); |
| 280 | memset(message, 0, size); |
| 281 | free (message); |
| 282 | return 0; |
| 283 | } |
| 284 | } |
| 285 | rc = -1; |
| 286 | } else if (!strcmp(argv[1], "clearpw")) { |
| 287 | SLOGD("cryptfs clearpw"); |
| 288 | dumpArgs(argc, argv, -1); |
| 289 | cryptfs_clear_password(); |
| 290 | rc = 0; |
| 291 | } else { |
| 292 | dumpArgs(argc, argv, -1); |
| 293 | cli->sendMsg(ResponseCode::CommandSyntaxError, "Unknown cryptfs cmd", false); |
| 294 | return 0; |
| 295 | } |
| 296 | |
| 297 | // Always report that the command succeeded and return the error code. |
| 298 | // The caller will check the return value to see what the error was. |
| 299 | char msg[255]; |
| 300 | snprintf(msg, sizeof(msg), "%d", rc); |
| 301 | cli->sendMsg(ResponseCode::CommandOkay, msg, false); |
| 302 | |
| 303 | return 0; |
| 304 | } |