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 36 #define ASSUMED_UPDATE_BINARY_NAME "META-INF/com/google/android/update-binary" 37 #define PUBLIC_KEYS_FILE "/res/keys" 38 39 static const char *LAST_INSTALL_FILE = "/cache/recovery/last_install"; 40 41 // If the package contains an update binary, extract it and run it. 42 static int 43 try_update_binary(const char *path, ZipArchive *zip) { 44 const ZipEntry* binary_entry = 45 mzFindZipEntry(zip, ASSUMED_UPDATE_BINARY_NAME); 46 if (binary_entry == NULL) { 47 mzCloseZipArchive(zip); 48 return INSTALL_CORRUPT; 49 } 50 51 char* binary = "/tmp/update_binary"; 52 unlink(binary); 53 int fd = creat(binary, 0755); 54 if (fd < 0) { 55 mzCloseZipArchive(zip); 56 LOGE("Can't make %s\n", binary); 57 return 1; 58 } 59 bool ok = mzExtractZipEntryToFile(zip, binary_entry, fd); 60 close(fd); 61 mzCloseZipArchive(zip); 62 63 if (!ok) { 64 LOGE("Can't copy %s\n", ASSUMED_UPDATE_BINARY_NAME); 65 return 1; 66 } 67 68 int pipefd[2]; 69 pipe(pipefd); 70 71 // When executing the update binary contained in the package, the 72 // arguments passed are: 73 // 74 // - the version number for this interface 75 // 76 // - an fd to which the program can write in order to update the 77 // progress bar. The program can write single-line commands: 78 // 79 // progress <frac> <secs> 80 // fill up the next <frac> part of of the progress bar 81 // over <secs> seconds. If <secs> is zero, use 82 // set_progress commands to manually control the 83 // progress of this segment of the bar 84 // 85 // set_progress <frac> 86 // <frac> should be between 0.0 and 1.0; sets the 87 // progress bar within the segment defined by the most 88 // recent progress command. 89 // 90 // firmware <"hboot"|"radio"> <filename> 91 // arrange to install the contents of <filename> in the 92 // given partition on reboot. 93 // 94 // (API v2: <filename> may start with "PACKAGE:" to 95 // indicate taking a file from the OTA package.) 96 // 97 // (API v3: this command no longer exists.) 98 // 99 // ui_print <string> 100 // display <string> on the screen. 101 // 102 // - the name of the package zip file. 103 // 104 105 char** args = malloc(sizeof(char*) * 5); 106 args[0] = binary; 107 args[1] = EXPAND(RECOVERY_API_VERSION); // defined in Android.mk 108 args[2] = malloc(10); 109 sprintf(args[2], "%d", pipefd[1]); 110 args[3] = (char*)path; 111 args[4] = NULL; 112 113 pid_t pid = fork(); 114 if (pid == 0) { 115 close(pipefd[0]); 116 execv(binary, args); 117 fprintf(stdout, "E:Can't run %s (%s)\n", binary, strerror(errno)); 118 _exit(-1); 119 } 120 close(pipefd[1]); 121 122 char buffer[1024]; 123 FILE* from_child = fdopen(pipefd[0], "r"); 124 while (fgets(buffer, sizeof(buffer), from_child) != NULL) { 125 char* command = strtok(buffer, " \n"); 126 if (command == NULL) { 127 continue; 128 } else if (strcmp(command, "progress") == 0) { 129 char* fraction_s = strtok(NULL, " \n"); 130 char* seconds_s = strtok(NULL, " \n"); 131 132 float fraction = strtof(fraction_s, NULL); 133 int seconds = strtol(seconds_s, NULL, 10); 134 135 ui_show_progress(fraction * (1-VERIFICATION_PROGRESS_FRACTION), 136 seconds); 137 } else if (strcmp(command, "set_progress") == 0) { 138 char* fraction_s = strtok(NULL, " \n"); 139 float fraction = strtof(fraction_s, NULL); 140 ui_set_progress(fraction); 141 } else if (strcmp(command, "ui_print") == 0) { 142 char* str = strtok(NULL, "\n"); 143 if (str) { 144 ui_print("%s", str); 145 } else { 146 ui_print("\n"); 147 } 148 } else { 149 LOGE("unknown command [%s]\n", command); 150 } 151 } 152 fclose(from_child); 153 154 int status; 155 waitpid(pid, &status, 0); 156 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { 157 LOGE("Error in %s\n(Status %d)\n", path, WEXITSTATUS(status)); 158 return INSTALL_ERROR; 159 } 160 161 return INSTALL_SUCCESS; 162 } 163 164 // Reads a file containing one or more public keys as produced by 165 // DumpPublicKey: this is an RSAPublicKey struct as it would appear 166 // as a C source literal, eg: 167 // 168 // "{64,0xc926ad21,{1795090719,...,-695002876},{-857949815,...,1175080310}}" 169 // 170 // (Note that the braces and commas in this example are actual 171 // characters the parser expects to find in the file; the ellipses 172 // indicate more numbers omitted from this example.) 173 // 174 // The file may contain multiple keys in this format, separated by 175 // commas. The last key must not be followed by a comma. 176 // 177 // Returns NULL if the file failed to parse, or if it contain zero keys. 178 static RSAPublicKey* 179 load_keys(const char* filename, int* numKeys) { 180 RSAPublicKey* out = NULL; 181 *numKeys = 0; 182 183 FILE* f = fopen(filename, "r"); 184 if (f == NULL) { 185 LOGE("opening %s: %s\n", filename, strerror(errno)); 186 goto exit; 187 } 188 189 int i; 190 bool done = false; 191 while (!done) { 192 ++*numKeys; 193 out = realloc(out, *numKeys * sizeof(RSAPublicKey)); 194 RSAPublicKey* key = out + (*numKeys - 1); 195 if (fscanf(f, " { %i , 0x%x , { %u", 196 &(key->len), &(key->n0inv), &(key->n[0])) != 3) { 197 goto exit; 198 } 199 if (key->len != RSANUMWORDS) { 200 LOGE("key length (%d) does not match expected size\n", key->len); 201 goto exit; 202 } 203 for (i = 1; i < key->len; ++i) { 204 if (fscanf(f, " , %u", &(key->n[i])) != 1) goto exit; 205 } 206 if (fscanf(f, " } , { %u", &(key->rr[0])) != 1) goto exit; 207 for (i = 1; i < key->len; ++i) { 208 if (fscanf(f, " , %u", &(key->rr[i])) != 1) goto exit; 209 } 210 fscanf(f, " } } "); 211 212 // if the line ends in a comma, this file has more keys. 213 switch (fgetc(f)) { 214 case ',': 215 // more keys to come. 216 break; 217 218 case EOF: 219 done = true; 220 break; 221 222 default: 223 LOGE("unexpected character between keys\n"); 224 goto exit; 225 } 226 } 227 228 fclose(f); 229 return out; 230 231 exit: 232 if (f) fclose(f); 233 free(out); 234 *numKeys = 0; 235 return NULL; 236 } 237 238 static int 239 really_install_package(const char *path) 240 { 241 ui_set_background(BACKGROUND_ICON_INSTALLING); 242 ui_print("Finding update package...\n"); 243 ui_show_indeterminate_progress(); 244 LOGI("Update location: %s\n", path); 245 246 if (ensure_path_mounted(path) != 0) { 247 LOGE("Can't mount %s\n", path); 248 return INSTALL_CORRUPT; 249 } 250 251 ui_print("Opening update package...\n"); 252 253 int numKeys; 254 RSAPublicKey* loadedKeys = load_keys(PUBLIC_KEYS_FILE, &numKeys); 255 if (loadedKeys == NULL) { 256 LOGE("Failed to load keys\n"); 257 return INSTALL_CORRUPT; 258 } 259 LOGI("%d key(s) loaded from %s\n", numKeys, PUBLIC_KEYS_FILE); 260 261 // Give verification half the progress bar... 262 ui_print("Verifying update package...\n"); 263 ui_show_progress( 264 VERIFICATION_PROGRESS_FRACTION, 265 VERIFICATION_PROGRESS_TIME); 266 267 int err; 268 err = verify_file(path, loadedKeys, numKeys); 269 free(loadedKeys); 270 LOGI("verify_file returned %d\n", err); 271 if (err != VERIFY_SUCCESS) { 272 LOGE("signature verification failed\n"); 273 return INSTALL_CORRUPT; 274 } 275 276 /* Try to open the package. 277 */ 278 ZipArchive zip; 279 err = mzOpenZipArchive(path, &zip); 280 if (err != 0) { 281 LOGE("Can't open %s\n(%s)\n", path, err != -1 ? strerror(err) : "bad"); 282 return INSTALL_CORRUPT; 283 } 284 285 /* Verify and install the contents of the package. 286 */ 287 ui_print("Installing update...\n"); 288 return try_update_binary(path, &zip); 289 } 290 291 int 292 install_package(const char* path) 293 { 294 FILE* install_log = fopen_path(LAST_INSTALL_FILE, "w"); 295 if (install_log) { 296 fputs(path, install_log); 297 fputc('\n', install_log); 298 } else { 299 LOGE("failed to open last_install: %s\n", strerror(errno)); 300 } 301 int result = really_install_package(path); 302 if (install_log) { 303 fputc(result == INSTALL_SUCCESS ? '1' : '0', install_log); 304 fputc('\n', install_log); 305 fclose(install_log); 306 chmod(LAST_INSTALL_FILE, 0644); 307 } 308 return result; 309 } 310
