/*
* 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/parseint.h>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>
#include <cutils/properties.h>
#include "common.h"
#include "error_code.h"
#include "install.h"
#include "minui/minui.h"
#include "minzip/SysUtil.h"
#include "minzip/Zip.h"
#include "mtdutils/mounts.h"
#include "mtdutils/mtdutils.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(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;
}
}
LOGE("Failed to parse build number in %s.\n", str.c_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) {
LOGE("Failed to find %s in update package.\n", METADATA_PATH);
return false;
}
meta_data->resize(meta_entry->uncompLen, '\0');
if (!mzReadZipEntry(zip, meta_entry, &(*meta_data)[0], meta_entry->uncompLen)) {
LOGE("Failed to read metadata in update package.\n");
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()) {
LOGE("Package is for product %s but expected %s\n",
pkg_device.c_str(), 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) {
LOGE("Package is for serial %s\n", pkg_serial_no.c_str());
return INSTALL_ERROR;
}
if (metadata["ota-type"] != "AB") {
LOGE("Package is not A/B\n");
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) {
LOGE("Package is for source build %s but expected %s\n",
pkg_pre_build.c_str(), 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) {
LOGE("Package is for source build %s but expected %s\n",
pkg_pre_build_fingerprint.c_str(), value);
return INSTALL_ERROR;
}
// Check for downgrade version.
int64_t build_timestampt = property_get_int64(
"ro.build.date.utc", std::numeric_limits<int64_t>::max());
int64_t pkg_post_timespampt = 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_timespampt) ||
pkg_post_timespampt < build_timestampt) {
if (metadata["ota-downgrade"] != "yes") {
LOGE("Update package is older than the current build, expected a "
"build newer than timestamp %" PRIu64 " but package has "
"timestamp %" PRIu64 " and downgrade not allowed.\n",
build_timestampt, pkg_post_timespampt);
return INSTALL_ERROR;
}
if (pkg_pre_build_fingerprint.empty()) {
LOGE("Downgrade package must have a pre-build version set, not "
"allowed.\n");
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) {
LOGE("Can't find %s\n", AB_OTA_PAYLOAD_PROPERTIES);
return INSTALL_CORRUPT;
}
std::vector<unsigned char> payload_properties(
mzGetZipEntryUncompLen(properties_entry));
if (!mzExtractZipEntryToBuffer(zip, properties_entry,
payload_properties.data())) {
LOGE("Can't extract %s\n", AB_OTA_PAYLOAD_PROPERTIES);
return INSTALL_CORRUPT;
}
const ZipEntry* payload_entry = mzFindZipEntry(zip, AB_OTA_PAYLOAD);
if (!payload_entry) {
LOGE("Can't find %s\n", 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) {
LOGE("Can't make %s\n", binary);
return INSTALL_ERROR;
}
bool ok = mzExtractZipEntryToFile(zip, binary_entry, fd);
close(fd);
if (!ok) {
LOGE("Can't copy %s\n", 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 == 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 {
LOGE("unknown command [%s]\n", command);
}
}
fclose(from_child);
int status;
waitpid(pid, &status, 0);
if (retry_update) {
return INSTALL_RETRY;
}
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
LOGE("Error in %s\n(Status %d)\n", path, 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);
LOGI("Update location: %s\n", 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) {
LOGE("failed to map file\n");
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) {
LOGE("Can't open %s\n(%s)\n", path, err != -1 ? strerror(err) : "bad");
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) {
LOGE("failed to set up expected mounts for install; aborting\n");
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) {
LOGW("Can't mount %s\n", UNCRYPT_STATUS);
} else {
std::string uncrypt_status;
if (!android::base::ReadFileToString(UNCRYPT_STATUS, &uncrypt_status)) {
LOGW("failed to read uncrypt status: %s\n", strerror(errno));
} else if (!android::base::StartsWith(uncrypt_status, "uncrypt_")) {
LOGW("corrupted uncrypt_status: %s: %s\n", uncrypt_status.c_str(), strerror(errno));
} 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)) {
LOGE("failed to write %s: %s\n", install_file, strerror(errno));
}
// Write a copy into last_log.
LOGI("%s\n", log_content.c_str());
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)) {
LOGE("Failed to load keys\n");
return false;
}
LOGI("%zu key(s) loaded from %s\n", loadedKeys.size(), 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) {
LOGE("Signature verification failed\n");
LOGE("error: %d\n", kZipVerificationFailure);
return false;
}
return true;
}