| /* |
| * Copyright (C) 2007 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <ctype.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <inttypes.h> |
| #include <limits.h> |
| #include <string.h> |
| #include <sys/stat.h> |
| #include <sys/wait.h> |
| #include <unistd.h> |
| |
| #include <chrono> |
| #include <limits> |
| #include <map> |
| #include <string> |
| #include <vector> |
| |
| #include <android-base/file.h> |
| #include <android-base/logging.h> |
| #include <android-base/parseint.h> |
| #include <android-base/stringprintf.h> |
| #include <android-base/strings.h> |
| #include <cutils/properties.h> |
| #include <android-base/logging.h> |
| |
| #include "common.h" |
| #include "error_code.h" |
| #include "install.h" |
| #include "minui/minui.h" |
| #include "minzip/SysUtil.h" |
| #include "minzip/Zip.h" |
| #include "roots.h" |
| #include "ui.h" |
| #include "verifier.h" |
| |
| extern RecoveryUI* ui; |
| |
| #define ASSUMED_UPDATE_BINARY_NAME "META-INF/com/google/android/update-binary" |
| static constexpr const char* AB_OTA_PAYLOAD_PROPERTIES = "payload_properties.txt"; |
| static constexpr const char* AB_OTA_PAYLOAD = "payload.bin"; |
| #define PUBLIC_KEYS_FILE "/res/keys" |
| static constexpr const char* METADATA_PATH = "META-INF/com/android/metadata"; |
| static constexpr const char* UNCRYPT_STATUS = "/cache/recovery/uncrypt_status"; |
| |
| // Default allocation of progress bar segments to operations |
| static const int VERIFICATION_PROGRESS_TIME = 60; |
| static const float VERIFICATION_PROGRESS_FRACTION = 0.25; |
| static const float DEFAULT_FILES_PROGRESS_FRACTION = 0.4; |
| static const float DEFAULT_IMAGE_PROGRESS_FRACTION = 0.1; |
| |
| // This function parses and returns the build.version.incremental |
| static int parse_build_number(const std::string& str) { |
| size_t pos = str.find('='); |
| if (pos != std::string::npos) { |
| std::string num_string = android::base::Trim(str.substr(pos+1)); |
| int build_number; |
| if (android::base::ParseInt(num_string.c_str(), &build_number, 0)) { |
| return build_number; |
| } |
| } |
| |
| LOG(ERROR) << "Failed to parse build number in " << str; |
| return -1; |
| } |
| |
| bool read_metadata_from_package(ZipArchive* zip, std::string* meta_data) { |
| const ZipEntry* meta_entry = mzFindZipEntry(zip, METADATA_PATH); |
| if (meta_entry == nullptr) { |
| LOG(ERROR) << "Failed to find " << METADATA_PATH << " in update package"; |
| return false; |
| } |
| |
| meta_data->resize(meta_entry->uncompLen, '\0'); |
| if (!mzReadZipEntry(zip, meta_entry, &(*meta_data)[0], meta_entry->uncompLen)) { |
| LOG(ERROR) << "Failed to read metadata in update package"; |
| return false; |
| } |
| return true; |
| } |
| |
| // Read the build.version.incremental of src/tgt from the metadata and log it to last_install. |
| static void read_source_target_build(ZipArchive* zip, std::vector<std::string>& log_buffer) { |
| std::string meta_data; |
| if (!read_metadata_from_package(zip, &meta_data)) { |
| return; |
| } |
| // Examples of the pre-build and post-build strings in metadata: |
| // pre-build-incremental=2943039 |
| // post-build-incremental=2951741 |
| std::vector<std::string> lines = android::base::Split(meta_data, "\n"); |
| for (const std::string& line : lines) { |
| std::string str = android::base::Trim(line); |
| if (android::base::StartsWith(str, "pre-build-incremental")){ |
| int source_build = parse_build_number(str); |
| if (source_build != -1) { |
| log_buffer.push_back(android::base::StringPrintf("source_build: %d", |
| source_build)); |
| } |
| } else if (android::base::StartsWith(str, "post-build-incremental")) { |
| int target_build = parse_build_number(str); |
| if (target_build != -1) { |
| log_buffer.push_back(android::base::StringPrintf("target_build: %d", |
| target_build)); |
| } |
| } |
| } |
| } |
| |
| // Extract the update binary from the open zip archive |zip| located at |path| |
| // and store into |cmd| the command line that should be called. The |status_fd| |
| // is the file descriptor the child process should use to report back the |
| // progress of the update. |
| static int |
| update_binary_command(const char* path, ZipArchive* zip, int retry_count, |
| int status_fd, std::vector<std::string>* cmd); |
| |
| #ifdef AB_OTA_UPDATER |
| |
| // Parses the metadata of the OTA package in |zip| and checks whether we are |
| // allowed to accept this A/B package. Downgrading is not allowed unless |
| // explicitly enabled in the package and only for incremental packages. |
| static int check_newer_ab_build(ZipArchive* zip) |
| { |
| std::string metadata_str; |
| if (!read_metadata_from_package(zip, &metadata_str)) { |
| return INSTALL_CORRUPT; |
| } |
| std::map<std::string, std::string> metadata; |
| for (const std::string& line : android::base::Split(metadata_str, "\n")) { |
| size_t eq = line.find('='); |
| if (eq != std::string::npos) { |
| metadata[line.substr(0, eq)] = line.substr(eq + 1); |
| } |
| } |
| char value[PROPERTY_VALUE_MAX]; |
| |
| property_get("ro.product.device", value, ""); |
| const std::string& pkg_device = metadata["pre-device"]; |
| if (pkg_device != value || pkg_device.empty()) { |
| LOG(ERROR) << "Package is for product " << pkg_device << " but expected " << value; |
| return INSTALL_ERROR; |
| } |
| |
| // We allow the package to not have any serialno, but if it has a non-empty |
| // value it should match. |
| property_get("ro.serialno", value, ""); |
| const std::string& pkg_serial_no = metadata["serialno"]; |
| if (!pkg_serial_no.empty() && pkg_serial_no != value) { |
| LOG(ERROR) << "Package is for serial " << pkg_serial_no; |
| return INSTALL_ERROR; |
| } |
| |
| if (metadata["ota-type"] != "AB") { |
| LOG(ERROR) << "Package is not A/B"; |
| return INSTALL_ERROR; |
| } |
| |
| // Incremental updates should match the current build. |
| property_get("ro.build.version.incremental", value, ""); |
| const std::string& pkg_pre_build = metadata["pre-build-incremental"]; |
| if (!pkg_pre_build.empty() && pkg_pre_build != value) { |
| LOG(ERROR) << "Package is for source build " << pkg_pre_build << " but expected " << value; |
| return INSTALL_ERROR; |
| } |
| property_get("ro.build.fingerprint", value, ""); |
| const std::string& pkg_pre_build_fingerprint = metadata["pre-build"]; |
| if (!pkg_pre_build_fingerprint.empty() && |
| pkg_pre_build_fingerprint != value) { |
| LOG(ERROR) << "Package is for source build " << pkg_pre_build_fingerprint |
| << " but expected " << value; |
| return INSTALL_ERROR; |
| } |
| |
| // Check for downgrade version. |
| int64_t build_timestamp = property_get_int64( |
| "ro.build.date.utc", std::numeric_limits<int64_t>::max()); |
| int64_t pkg_post_timestamp = 0; |
| // We allow to full update to the same version we are running, in case there |
| // is a problem with the current copy of that version. |
| if (metadata["post-timestamp"].empty() || |
| !android::base::ParseInt(metadata["post-timestamp"].c_str(), |
| &pkg_post_timestamp) || |
| pkg_post_timestamp < build_timestamp) { |
| if (metadata["ota-downgrade"] != "yes") { |
| LOG(ERROR) << "Update package is older than the current build, expected a build " |
| "newer than timestamp " << build_timestamp << " but package has " |
| "timestamp " << pkg_post_timestamp << " and downgrade not allowed."; |
| return INSTALL_ERROR; |
| } |
| if (pkg_pre_build_fingerprint.empty()) { |
| LOG(ERROR) << "Downgrade package must have a pre-build version set, not allowed."; |
| return INSTALL_ERROR; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int |
| update_binary_command(const char* path, ZipArchive* zip, int retry_count, |
| int status_fd, std::vector<std::string>* cmd) |
| { |
| int ret = check_newer_ab_build(zip); |
| if (ret) { |
| return ret; |
| } |
| |
| // For A/B updates we extract the payload properties to a buffer and obtain |
| // the RAW payload offset in the zip file. |
| const ZipEntry* properties_entry = |
| mzFindZipEntry(zip, AB_OTA_PAYLOAD_PROPERTIES); |
| if (!properties_entry) { |
| LOG(ERROR) << "Can't find " << AB_OTA_PAYLOAD_PROPERTIES; |
| return INSTALL_CORRUPT; |
| } |
| std::vector<unsigned char> payload_properties( |
| mzGetZipEntryUncompLen(properties_entry)); |
| if (!mzExtractZipEntryToBuffer(zip, properties_entry, |
| payload_properties.data())) { |
| LOG(ERROR) << "Can't extract " << AB_OTA_PAYLOAD_PROPERTIES; |
| return INSTALL_CORRUPT; |
| } |
| |
| const ZipEntry* payload_entry = mzFindZipEntry(zip, AB_OTA_PAYLOAD); |
| if (!payload_entry) { |
| LOG(ERROR) << "Can't find " << AB_OTA_PAYLOAD; |
| return INSTALL_CORRUPT; |
| } |
| long payload_offset = mzGetZipEntryOffset(payload_entry); |
| *cmd = { |
| "/sbin/update_engine_sideload", |
| android::base::StringPrintf("--payload=file://%s", path), |
| android::base::StringPrintf("--offset=%ld", payload_offset), |
| "--headers=" + std::string(payload_properties.begin(), |
| payload_properties.end()), |
| android::base::StringPrintf("--status_fd=%d", status_fd), |
| }; |
| return 0; |
| } |
| |
| #else // !AB_OTA_UPDATER |
| |
| static int |
| update_binary_command(const char* path, ZipArchive* zip, int retry_count, |
| int status_fd, std::vector<std::string>* cmd) |
| { |
| // On traditional updates we extract the update binary from the package. |
| const ZipEntry* binary_entry = |
| mzFindZipEntry(zip, ASSUMED_UPDATE_BINARY_NAME); |
| if (binary_entry == NULL) { |
| return INSTALL_CORRUPT; |
| } |
| |
| const char* binary = "/tmp/update_binary"; |
| unlink(binary); |
| int fd = creat(binary, 0755); |
| if (fd < 0) { |
| PLOG(ERROR) << "Can't make " << binary; |
| return INSTALL_ERROR; |
| } |
| bool ok = mzExtractZipEntryToFile(zip, binary_entry, fd); |
| close(fd); |
| |
| if (!ok) { |
| LOG(ERROR) << "Can't copy " << ASSUMED_UPDATE_BINARY_NAME; |
| return INSTALL_ERROR; |
| } |
| |
| *cmd = { |
| binary, |
| EXPAND(RECOVERY_API_VERSION), // defined in Android.mk |
| std::to_string(status_fd), |
| path, |
| }; |
| if (retry_count > 0) |
| cmd->push_back("retry"); |
| return 0; |
| } |
| #endif // !AB_OTA_UPDATER |
| |
| // If the package contains an update binary, extract it and run it. |
| static int |
| try_update_binary(const char* path, ZipArchive* zip, bool* wipe_cache, |
| std::vector<std::string>& log_buffer, int retry_count) |
| { |
| read_source_target_build(zip, log_buffer); |
| |
| int pipefd[2]; |
| pipe(pipefd); |
| |
| std::vector<std::string> args; |
| int ret = update_binary_command(path, zip, retry_count, pipefd[1], &args); |
| mzCloseZipArchive(zip); |
| if (ret) { |
| close(pipefd[0]); |
| close(pipefd[1]); |
| return ret; |
| } |
| |
| // When executing the update binary contained in the package, the |
| // arguments passed are: |
| // |
| // - the version number for this interface |
| // |
| // - an fd to which the program can write in order to update the |
| // progress bar. The program can write single-line commands: |
| // |
| // progress <frac> <secs> |
| // fill up the next <frac> part of of the progress bar |
| // over <secs> seconds. If <secs> is zero, use |
| // set_progress commands to manually control the |
| // progress of this segment of the bar. |
| // |
| // set_progress <frac> |
| // <frac> should be between 0.0 and 1.0; sets the |
| // progress bar within the segment defined by the most |
| // recent progress command. |
| // |
| // firmware <"hboot"|"radio"> <filename> |
| // arrange to install the contents of <filename> in the |
| // given partition on reboot. |
| // |
| // (API v2: <filename> may start with "PACKAGE:" to |
| // indicate taking a file from the OTA package.) |
| // |
| // (API v3: this command no longer exists.) |
| // |
| // ui_print <string> |
| // display <string> on the screen. |
| // |
| // wipe_cache |
| // a wipe of cache will be performed following a successful |
| // installation. |
| // |
| // clear_display |
| // turn off the text display. |
| // |
| // enable_reboot |
| // packages can explicitly request that they want the user |
| // to be able to reboot during installation (useful for |
| // debugging packages that don't exit). |
| // |
| // - the name of the package zip file. |
| // |
| // - an optional argument "retry" if this update is a retry of a failed |
| // update attempt. |
| // |
| |
| // Convert the vector to a NULL-terminated char* array suitable for execv. |
| const char* chr_args[args.size() + 1]; |
| chr_args[args.size()] = NULL; |
| for (size_t i = 0; i < args.size(); i++) { |
| chr_args[i] = args[i].c_str(); |
| } |
| |
| pid_t pid = fork(); |
| |
| if (pid == -1) { |
| close(pipefd[0]); |
| close(pipefd[1]); |
| PLOG(ERROR) << "Failed to fork update binary"; |
| return INSTALL_ERROR; |
| } |
| |
| if (pid == 0) { |
| umask(022); |
| close(pipefd[0]); |
| execv(chr_args[0], const_cast<char**>(chr_args)); |
| fprintf(stdout, "E:Can't run %s (%s)\n", chr_args[0], strerror(errno)); |
| _exit(-1); |
| } |
| close(pipefd[1]); |
| |
| *wipe_cache = false; |
| bool retry_update = false; |
| |
| char buffer[1024]; |
| FILE* from_child = fdopen(pipefd[0], "r"); |
| while (fgets(buffer, sizeof(buffer), from_child) != NULL) { |
| char* command = strtok(buffer, " \n"); |
| if (command == NULL) { |
| continue; |
| } else if (strcmp(command, "progress") == 0) { |
| char* fraction_s = strtok(NULL, " \n"); |
| char* seconds_s = strtok(NULL, " \n"); |
| |
| float fraction = strtof(fraction_s, NULL); |
| int seconds = strtol(seconds_s, NULL, 10); |
| |
| ui->ShowProgress(fraction * (1-VERIFICATION_PROGRESS_FRACTION), seconds); |
| } else if (strcmp(command, "set_progress") == 0) { |
| char* fraction_s = strtok(NULL, " \n"); |
| float fraction = strtof(fraction_s, NULL); |
| ui->SetProgress(fraction); |
| } else if (strcmp(command, "ui_print") == 0) { |
| char* str = strtok(NULL, "\n"); |
| if (str) { |
| ui->PrintOnScreenOnly("%s", str); |
| } else { |
| ui->PrintOnScreenOnly("\n"); |
| } |
| fflush(stdout); |
| } else if (strcmp(command, "wipe_cache") == 0) { |
| *wipe_cache = true; |
| } else if (strcmp(command, "clear_display") == 0) { |
| ui->SetBackground(RecoveryUI::NONE); |
| } else if (strcmp(command, "enable_reboot") == 0) { |
| // packages can explicitly request that they want the user |
| // to be able to reboot during installation (useful for |
| // debugging packages that don't exit). |
| ui->SetEnableReboot(true); |
| } else if (strcmp(command, "retry_update") == 0) { |
| retry_update = true; |
| } else if (strcmp(command, "log") == 0) { |
| // Save the logging request from updater and write to |
| // last_install later. |
| log_buffer.push_back(std::string(strtok(NULL, "\n"))); |
| } else { |
| LOG(ERROR) << "unknown command [" << command << "]"; |
| } |
| } |
| fclose(from_child); |
| |
| int status; |
| waitpid(pid, &status, 0); |
| if (retry_update) { |
| return INSTALL_RETRY; |
| } |
| if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { |
| LOG(ERROR) << "Error in " << path << " (Status " << WEXITSTATUS(status) << ")"; |
| return INSTALL_ERROR; |
| } |
| |
| return INSTALL_SUCCESS; |
| } |
| |
| static int |
| really_install_package(const char *path, bool* wipe_cache, bool needs_mount, |
| std::vector<std::string>& log_buffer, int retry_count) |
| { |
| ui->SetBackground(RecoveryUI::INSTALLING_UPDATE); |
| ui->Print("Finding update package...\n"); |
| // Give verification half the progress bar... |
| ui->SetProgressType(RecoveryUI::DETERMINATE); |
| ui->ShowProgress(VERIFICATION_PROGRESS_FRACTION, VERIFICATION_PROGRESS_TIME); |
| LOG(INFO) << "Update location: " << path; |
| |
| // Map the update package into memory. |
| ui->Print("Opening update package...\n"); |
| |
| if (path && needs_mount) { |
| if (path[0] == '@') { |
| ensure_path_mounted(path+1); |
| } else { |
| ensure_path_mounted(path); |
| } |
| } |
| |
| MemMapping map; |
| if (sysMapFile(path, &map) != 0) { |
| LOG(ERROR) << "failed to map file"; |
| return INSTALL_CORRUPT; |
| } |
| |
| // Verify package. |
| if (!verify_package(map.addr, map.length)) { |
| log_buffer.push_back(android::base::StringPrintf("error: %d", kZipVerificationFailure)); |
| sysReleaseMap(&map); |
| return INSTALL_CORRUPT; |
| } |
| |
| // Try to open the package. |
| ZipArchive zip; |
| int err = mzOpenZipArchive(map.addr, map.length, &zip); |
| if (err != 0) { |
| LOG(ERROR) << "Can't open " << path; |
| log_buffer.push_back(android::base::StringPrintf("error: %d", kZipOpenFailure)); |
| |
| sysReleaseMap(&map); |
| return INSTALL_CORRUPT; |
| } |
| |
| // Verify and install the contents of the package. |
| ui->Print("Installing update...\n"); |
| if (retry_count > 0) { |
| ui->Print("Retry attempt: %d\n", retry_count); |
| } |
| ui->SetEnableReboot(false); |
| int result = try_update_binary(path, &zip, wipe_cache, log_buffer, retry_count); |
| ui->SetEnableReboot(true); |
| ui->Print("\n"); |
| |
| sysReleaseMap(&map); |
| |
| return result; |
| } |
| |
| int |
| install_package(const char* path, bool* wipe_cache, const char* install_file, |
| bool needs_mount, int retry_count) |
| { |
| modified_flash = true; |
| auto start = std::chrono::system_clock::now(); |
| |
| int result; |
| std::vector<std::string> log_buffer; |
| if (setup_install_mounts() != 0) { |
| LOG(ERROR) << "failed to set up expected mounts for install; aborting"; |
| result = INSTALL_ERROR; |
| } else { |
| result = really_install_package(path, wipe_cache, needs_mount, log_buffer, retry_count); |
| } |
| |
| // Measure the time spent to apply OTA update in seconds. |
| std::chrono::duration<double> duration = std::chrono::system_clock::now() - start; |
| int time_total = static_cast<int>(duration.count()); |
| |
| if (ensure_path_mounted(UNCRYPT_STATUS) != 0) { |
| LOG(WARNING) << "Can't mount " << UNCRYPT_STATUS; |
| } else { |
| std::string uncrypt_status; |
| if (!android::base::ReadFileToString(UNCRYPT_STATUS, &uncrypt_status)) { |
| PLOG(WARNING) << "failed to read uncrypt status"; |
| } else if (!android::base::StartsWith(uncrypt_status, "uncrypt_")) { |
| LOG(WARNING) << "corrupted uncrypt_status: " << uncrypt_status; |
| } else { |
| log_buffer.push_back(android::base::Trim(uncrypt_status)); |
| } |
| } |
| |
| // The first two lines need to be the package name and install result. |
| std::vector<std::string> log_header = { |
| path, |
| result == INSTALL_SUCCESS ? "1" : "0", |
| "time_total: " + std::to_string(time_total), |
| "retry: " + std::to_string(retry_count), |
| }; |
| std::string log_content = android::base::Join(log_header, "\n") + "\n" + |
| android::base::Join(log_buffer, "\n"); |
| if (!android::base::WriteStringToFile(log_content, install_file)) { |
| PLOG(ERROR) << "failed to write " << install_file; |
| } |
| |
| // Write a copy into last_log. |
| LOG(INFO) << log_content; |
| |
| return result; |
| } |
| |
| bool verify_package(const unsigned char* package_data, size_t package_size) { |
| std::vector<Certificate> loadedKeys; |
| if (!load_keys(PUBLIC_KEYS_FILE, loadedKeys)) { |
| LOG(ERROR) << "Failed to load keys"; |
| return false; |
| } |
| LOG(INFO) << loadedKeys.size() << " key(s) loaded from " << PUBLIC_KEYS_FILE; |
| |
| // Verify package. |
| ui->Print("Verifying update package...\n"); |
| auto t0 = std::chrono::system_clock::now(); |
| int err = verify_file(const_cast<unsigned char*>(package_data), package_size, loadedKeys); |
| std::chrono::duration<double> duration = std::chrono::system_clock::now() - t0; |
| ui->Print("Update package verification took %.1f s (result %d).\n", duration.count(), err); |
| if (err != VERIFY_SUCCESS) { |
| LOG(ERROR) << "Signature verification failed"; |
| LOG(ERROR) << "error: " << kZipVerificationFailure; |
| return false; |
| } |
| return true; |
| } |