1 /* 2 * Copyright (C) 2007 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 <ctype.h> 18 #include <errno.h> 19 #include <fcntl.h> 20 #include <limits.h> 21 #include <sys/stat.h> 22 #include <sys/wait.h> 23 #include <unistd.h> 24 25 #include "common.h" 26 #include "install.h" 27 #include "mincrypt/rsa.h" 28 #include "minui/minui.h" 29 #include "minzip/SysUtil.h" 30 #include "minzip/Zip.h" 31 #include "mtdutils/mounts.h" 32 #include "mtdutils/mtdutils.h" 33 #include "roots.h" 34 #include "verifier.h" 35 #include "ui.h" 36 37 extern RecoveryUI* ui; 38 39 #define ASSUMED_UPDATE_BINARY_NAME "META-INF/com/google/android/update-binary" 40 #define PUBLIC_KEYS_FILE "/res/keys" 41 42 // Default allocation of progress bar segments to operations 43 static const int VERIFICATION_PROGRESS_TIME = 60; 44 static const float VERIFICATION_PROGRESS_FRACTION = 0.25; 45 static const float DEFAULT_FILES_PROGRESS_FRACTION = 0.4; 46 static const float DEFAULT_IMAGE_PROGRESS_FRACTION = 0.1; 47 48 // If the package contains an update binary, extract it and run it. 49 static int 50 try_update_binary(const char *path, ZipArchive *zip, int* wipe_cache) { 51 const ZipEntry* binary_entry = 52 mzFindZipEntry(zip, ASSUMED_UPDATE_BINARY_NAME); 53 if (binary_entry == NULL) { 54 mzCloseZipArchive(zip); 55 return INSTALL_CORRUPT; 56 } 57 58 const char* binary = "/tmp/update_binary"; 59 unlink(binary); 60 int fd = creat(binary, 0755); 61 if (fd < 0) { 62 mzCloseZipArchive(zip); 63 LOGE("Can't make %s\n", binary); 64 return INSTALL_ERROR; 65 } 66 bool ok = mzExtractZipEntryToFile(zip, binary_entry, fd); 67 close(fd); 68 mzCloseZipArchive(zip); 69 70 if (!ok) { 71 LOGE("Can't copy %s\n", ASSUMED_UPDATE_BINARY_NAME); 72 return INSTALL_ERROR; 73 } 74 75 int pipefd[2]; 76 pipe(pipefd); 77 78 // When executing the update binary contained in the package, the 79 // arguments passed are: 80 // 81 // - the version number for this interface 82 // 83 // - an fd to which the program can write in order to update the 84 // progress bar. The program can write single-line commands: 85 // 86 // progress <frac> <secs> 87 // fill up the next <frac> part of of the progress bar 88 // over <secs> seconds. If <secs> is zero, use 89 // set_progress commands to manually control the 90 // progress of this segment of the bar 91 // 92 // set_progress <frac> 93 // <frac> should be between 0.0 and 1.0; sets the 94 // progress bar within the segment defined by the most 95 // recent progress command. 96 // 97 // firmware <"hboot"|"radio"> <filename> 98 // arrange to install the contents of <filename> in the 99 // given partition on reboot. 100 // 101 // (API v2: <filename> may start with "PACKAGE:" to 102 // indicate taking a file from the OTA package.) 103 // 104 // (API v3: this command no longer exists.) 105 // 106 // ui_print <string> 107 // display <string> on the screen. 108 // 109 // - the name of the package zip file. 110 // 111 112 const char** args = (const char**)malloc(sizeof(char*) * 5); 113 args[0] = binary; 114 args[1] = EXPAND(RECOVERY_API_VERSION); // defined in Android.mk 115 char* temp = (char*)malloc(10); 116 sprintf(temp, "%d", pipefd[1]); 117 args[2] = temp; 118 args[3] = (char*)path; 119 args[4] = NULL; 120 121 pid_t pid = fork(); 122 if (pid == 0) { 123 close(pipefd[0]); 124 execv(binary, (char* const*)args); 125 fprintf(stdout, "E:Can't run %s (%s)\n", binary, strerror(errno)); 126 _exit(-1); 127 } 128 close(pipefd[1]); 129 130 *wipe_cache = 0; 131 132 char buffer[1024]; 133 FILE* from_child = fdopen(pipefd[0], "r"); 134 while (fgets(buffer, sizeof(buffer), from_child) != NULL) { 135 char* command = strtok(buffer, " \n"); 136 if (command == NULL) { 137 continue; 138 } else if (strcmp(command, "progress") == 0) { 139 char* fraction_s = strtok(NULL, " \n"); 140 char* seconds_s = strtok(NULL, " \n"); 141 142 float fraction = strtof(fraction_s, NULL); 143 int seconds = strtol(seconds_s, NULL, 10); 144 145 ui->ShowProgress(fraction * (1-VERIFICATION_PROGRESS_FRACTION), seconds); 146 } else if (strcmp(command, "set_progress") == 0) { 147 char* fraction_s = strtok(NULL, " \n"); 148 float fraction = strtof(fraction_s, NULL); 149 ui->SetProgress(fraction); 150 } else if (strcmp(command, "ui_print") == 0) { 151 char* str = strtok(NULL, "\n"); 152 if (str) { 153 ui->Print("%s", str); 154 } else { 155 ui->Print("\n"); 156 } 157 } else if (strcmp(command, "wipe_cache") == 0) { 158 *wipe_cache = 1; 159 } else if (strcmp(command, "clear_display") == 0) { 160 ui->SetBackground(RecoveryUI::NONE); 161 } else { 162 LOGE("unknown command [%s]\n", command); 163 } 164 } 165 fclose(from_child); 166 167 int status; 168 waitpid(pid, &status, 0); 169 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { 170 LOGE("Error in %s\n(Status %d)\n", path, WEXITSTATUS(status)); 171 return INSTALL_ERROR; 172 } 173 174 return INSTALL_SUCCESS; 175 } 176 177 // Reads a file containing one or more public keys as produced by 178 // DumpPublicKey: this is an RSAPublicKey struct as it would appear 179 // as a C source literal, eg: 180 // 181 // "{64,0xc926ad21,{1795090719,...,-695002876},{-857949815,...,1175080310}}" 182 // 183 // For key versions newer than the original 2048-bit e=3 keys 184 // supported by Android, the string is preceded by a version 185 // identifier, eg: 186 // 187 // "v2 {64,0xc926ad21,{1795090719,...,-695002876},{-857949815,...,1175080310}}" 188 // 189 // (Note that the braces and commas in this example are actual 190 // characters the parser expects to find in the file; the ellipses 191 // indicate more numbers omitted from this example.) 192 // 193 // The file may contain multiple keys in this format, separated by 194 // commas. The last key must not be followed by a comma. 195 // 196 // Returns NULL if the file failed to parse, or if it contain zero keys. 197 static RSAPublicKey* 198 load_keys(const char* filename, int* numKeys) { 199 RSAPublicKey* out = NULL; 200 *numKeys = 0; 201 202 FILE* f = fopen(filename, "r"); 203 if (f == NULL) { 204 LOGE("opening %s: %s\n", filename, strerror(errno)); 205 goto exit; 206 } 207 208 { 209 int i; 210 bool done = false; 211 while (!done) { 212 ++*numKeys; 213 out = (RSAPublicKey*)realloc(out, *numKeys * sizeof(RSAPublicKey)); 214 RSAPublicKey* key = out + (*numKeys - 1); 215 216 char start_char; 217 if (fscanf(f, " %c", &start_char) != 1) goto exit; 218 if (start_char == '{') { 219 // a version 1 key has no version specifier. 220 key->exponent = 3; 221 } else if (start_char == 'v') { 222 int version; 223 if (fscanf(f, "%d {", &version) != 1) goto exit; 224 if (version == 2) { 225 key->exponent = 65537; 226 } else { 227 goto exit; 228 } 229 } 230 231 if (fscanf(f, " %i , 0x%x , { %u", 232 &(key->len), &(key->n0inv), &(key->n[0])) != 3) { 233 goto exit; 234 } 235 if (key->len != RSANUMWORDS) { 236 LOGE("key length (%d) does not match expected size\n", key->len); 237 goto exit; 238 } 239 for (i = 1; i < key->len; ++i) { 240 if (fscanf(f, " , %u", &(key->n[i])) != 1) goto exit; 241 } 242 if (fscanf(f, " } , { %u", &(key->rr[0])) != 1) goto exit; 243 for (i = 1; i < key->len; ++i) { 244 if (fscanf(f, " , %u", &(key->rr[i])) != 1) goto exit; 245 } 246 fscanf(f, " } } "); 247 248 // if the line ends in a comma, this file has more keys. 249 switch (fgetc(f)) { 250 case ',': 251 // more keys to come. 252 break; 253 254 case EOF: 255 done = true; 256 break; 257 258 default: 259 LOGE("unexpected character between keys\n"); 260 goto exit; 261 } 262 263 LOGI("read key e=%d\n", key->exponent); 264 } 265 } 266 267 fclose(f); 268 return out; 269 270 exit: 271 if (f) fclose(f); 272 free(out); 273 *numKeys = 0; 274 return NULL; 275 } 276 277 static int 278 really_install_package(const char *path, int* wipe_cache) 279 { 280 ui->SetBackground(RecoveryUI::INSTALLING_UPDATE); 281 ui->Print("Finding update package...\n"); 282 ui->SetProgressType(RecoveryUI::INDETERMINATE); 283 LOGI("Update location: %s\n", path); 284 285 if (ensure_path_mounted(path) != 0) { 286 LOGE("Can't mount %s\n", path); 287 return INSTALL_CORRUPT; 288 } 289 290 ui->Print("Opening update package...\n"); 291 292 int numKeys; 293 RSAPublicKey* loadedKeys = load_keys(PUBLIC_KEYS_FILE, &numKeys); 294 if (loadedKeys == NULL) { 295 LOGE("Failed to load keys\n"); 296 return INSTALL_CORRUPT; 297 } 298 LOGI("%d key(s) loaded from %s\n", numKeys, PUBLIC_KEYS_FILE); 299 300 // Give verification half the progress bar... 301 ui->Print("Verifying update package...\n"); 302 ui->SetProgressType(RecoveryUI::DETERMINATE); 303 ui->ShowProgress(VERIFICATION_PROGRESS_FRACTION, VERIFICATION_PROGRESS_TIME); 304 305 int err; 306 err = verify_file(path, loadedKeys, numKeys); 307 free(loadedKeys); 308 LOGI("verify_file returned %d\n", err); 309 if (err != VERIFY_SUCCESS) { 310 LOGE("signature verification failed\n"); 311 return INSTALL_CORRUPT; 312 } 313 314 /* Try to open the package. 315 */ 316 ZipArchive zip; 317 err = mzOpenZipArchive(path, &zip); 318 if (err != 0) { 319 LOGE("Can't open %s\n(%s)\n", path, err != -1 ? strerror(err) : "bad"); 320 return INSTALL_CORRUPT; 321 } 322 323 /* Verify and install the contents of the package. 324 */ 325 ui->Print("Installing update...\n"); 326 return try_update_binary(path, &zip, wipe_cache); 327 } 328 329 int 330 install_package(const char* path, int* wipe_cache, const char* install_file) 331 { 332 FILE* install_log = fopen_path(install_file, "w"); 333 if (install_log) { 334 fputs(path, install_log); 335 fputc('\n', install_log); 336 } else { 337 LOGE("failed to open last_install: %s\n", strerror(errno)); 338 } 339 int result = really_install_package(path, wipe_cache); 340 if (install_log) { 341 fputc(result == INSTALL_SUCCESS ? '1' : '0', install_log); 342 fputc('\n', install_log); 343 fclose(install_log); 344 } 345 return result; 346 } 347
