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platform_bootable_recovery/uncrypt/uncrypt.cpp
Jaegeuk Kim b6e6ee7587 f2fs: support f2fs by setting unmovable bit for package file 
This enables to use uncrypt for f2fs update-on-reboot.
It requires kernel patch named:
    "f2fs: add an ioctl to disable GC for specific file"

If any operation fails during uncrypt, please delete package file as soon as
possible, and create the file again to move forward. IOWs, don't leave the
package file for a long time.

Bug: 70309376
Bug: 30170612
Change-Id: I3b4233e7da756f107be35364521699deaf2e7139
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>
2018-03-22 12:10:08 -07:00

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/*
* Copyright (C) 2014 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.
*/
// This program takes a file on an ext4 filesystem and produces a list
// of the blocks that file occupies, which enables the file contents
// to be read directly from the block device without mounting the
// filesystem.
//
// If the filesystem is using an encrypted block device, it will also
// read the file and rewrite it to the same blocks of the underlying
// (unencrypted) block device, so the file contents can be read
// without the need for the decryption key.
//
// The output of this program is a "block map" which looks like this:
//
// /dev/block/platform/msm_sdcc.1/by-name/userdata # block device
// 49652 4096 # file size in bytes, block size
// 3 # count of block ranges
// 1000 1008 # block range 0
// 2100 2102 # ... block range 1
// 30 33 # ... block range 2
//
// Each block range represents a half-open interval; the line "30 33"
// reprents the blocks [30, 31, 32].
//
// Recovery can take this block map file and retrieve the underlying
// file data to use as an update package.
/**
* In addition to the uncrypt work, uncrypt also takes care of setting and
* clearing the bootloader control block (BCB) at /misc partition.
*
* uncrypt is triggered as init services on demand. It uses socket to
* communicate with its caller (i.e. system_server). The socket is managed by
* init (i.e. created prior to the service starts, and destroyed when uncrypt
* exits).
*
* Below is the uncrypt protocol.
*
* a. caller b. init c. uncrypt
* --------------- ------------ --------------
* a1. ctl.start:
* setup-bcb /
* clear-bcb /
* uncrypt
*
* b2. create socket at
* /dev/socket/uncrypt
*
* c3. listen and accept
*
* a4. send a 4-byte int
* (message length)
* c5. receive message length
* a6. send message
* c7. receive message
* c8. <do the work; may send
* the progress>
* a9. <may handle progress>
* c10. <upon finishing>
* send "100" or "-1"
*
* a11. receive status code
* a12. send a 4-byte int to
* ack the receive of the
* final status code
* c13. receive and exit
*
* b14. destroy the socket
*
* Note that a12 and c13 are necessary to ensure a11 happens before the socket
* gets destroyed in b14.
*/
#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <libgen.h>
#include <linux/fs.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <algorithm>
#include <memory>
#include <vector>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/properties.h>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>
#include <android-base/unique_fd.h>
#include <bootloader_message/bootloader_message.h>
#include <cutils/android_reboot.h>
#include <cutils/sockets.h>
#include <fs_mgr.h>
#include "otautil/error_code.h"
static constexpr int WINDOW_SIZE = 5;
static constexpr int FIBMAP_RETRY_LIMIT = 3;
// uncrypt provides three services: SETUP_BCB, CLEAR_BCB and UNCRYPT.
//
// SETUP_BCB and CLEAR_BCB services use socket communication and do not rely
// on /cache partitions. They will handle requests to reboot into recovery
// (for applying updates for non-A/B devices, or factory resets for all
// devices).
//
// UNCRYPT service still needs files on /cache partition (UNCRYPT_PATH_FILE
// and CACHE_BLOCK_MAP). It will be working (and needed) only for non-A/B
// devices, on which /cache partitions always exist.
static const std::string CACHE_BLOCK_MAP = "/cache/recovery/block.map";
static const std::string UNCRYPT_PATH_FILE = "/cache/recovery/uncrypt_file";
static const std::string UNCRYPT_STATUS = "/cache/recovery/uncrypt_status";
static const std::string UNCRYPT_SOCKET = "uncrypt";
static struct fstab* fstab = nullptr;
static int write_at_offset(unsigned char* buffer, size_t size, int wfd, off64_t offset) {
if (TEMP_FAILURE_RETRY(lseek64(wfd, offset, SEEK_SET)) == -1) {
PLOG(ERROR) << "error seeking to offset " << offset;
return -1;
}
if (!android::base::WriteFully(wfd, buffer, size)) {
PLOG(ERROR) << "error writing offset " << offset;
return -1;
}
return 0;
}
static void add_block_to_ranges(std::vector<int>& ranges, int new_block) {
if (!ranges.empty() && new_block == ranges.back()) {
// If the new block comes immediately after the current range,
// all we have to do is extend the current range.
++ranges.back();
} else {
// We need to start a new range.
ranges.push_back(new_block);
ranges.push_back(new_block + 1);
}
}
static struct fstab* read_fstab() {
fstab = fs_mgr_read_fstab_default();
if (!fstab) {
LOG(ERROR) << "failed to read default fstab";
return NULL;
}
return fstab;
}
static const char* find_block_device(const char* path, bool* encryptable,
bool* encrypted, bool* f2fs_fs) {
// Look for a volume whose mount point is the prefix of path and
// return its block device. Set encrypted if it's currently
// encrypted.
// ensure f2fs_fs is set to false first.
*f2fs_fs = false;
for (int i = 0; i < fstab->num_entries; ++i) {
struct fstab_rec* v = &fstab->recs[i];
if (!v->mount_point) {
continue;
}
int len = strlen(v->mount_point);
if (strncmp(path, v->mount_point, len) == 0 &&
(path[len] == '/' || path[len] == 0)) {
*encrypted = false;
*encryptable = false;
if (fs_mgr_is_encryptable(v) || fs_mgr_is_file_encrypted(v)) {
*encryptable = true;
if (android::base::GetProperty("ro.crypto.state", "") == "encrypted") {
*encrypted = true;
}
}
if (strcmp(v->fs_type, "f2fs") == 0) {
*f2fs_fs = true;
}
return v->blk_device;
}
}
return NULL;
}
static bool write_status_to_socket(int status, int socket) {
// If socket equals -1, uncrypt is in debug mode without socket communication.
// Skip writing and return success.
if (socket == -1) {
return true;
}
int status_out = htonl(status);
return android::base::WriteFully(socket, &status_out, sizeof(int));
}
// Parse uncrypt_file to find the update package name.
static bool find_uncrypt_package(const std::string& uncrypt_path_file, std::string* package_name) {
CHECK(package_name != nullptr);
std::string uncrypt_path;
if (!android::base::ReadFileToString(uncrypt_path_file, &uncrypt_path)) {
PLOG(ERROR) << "failed to open \"" << uncrypt_path_file << "\"";
return false;
}
// Remove the trailing '\n' if present.
*package_name = android::base::Trim(uncrypt_path);
return true;
}
static int retry_fibmap(const int fd, const char* name, int* block, const int head_block) {
CHECK(block != nullptr);
for (size_t i = 0; i < FIBMAP_RETRY_LIMIT; i++) {
if (fsync(fd) == -1) {
PLOG(ERROR) << "failed to fsync \"" << name << "\"";
return kUncryptFileSyncError;
}
if (ioctl(fd, FIBMAP, block) != 0) {
PLOG(ERROR) << "failed to find block " << head_block;
return kUncryptIoctlError;
}
if (*block != 0) {
return kUncryptNoError;
}
sleep(1);
}
LOG(ERROR) << "fibmap of " << head_block << "always returns 0";
return kUncryptIoctlError;
}
static int produce_block_map(const char* path, const char* map_file, const char* blk_dev,
bool encrypted, bool f2fs_fs, int socket) {
std::string err;
if (!android::base::RemoveFileIfExists(map_file, &err)) {
LOG(ERROR) << "failed to remove the existing map file " << map_file << ": " << err;
return kUncryptFileRemoveError;
}
std::string tmp_map_file = std::string(map_file) + ".tmp";
android::base::unique_fd mapfd(open(tmp_map_file.c_str(),
O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR));
if (mapfd == -1) {
PLOG(ERROR) << "failed to open " << tmp_map_file;
return kUncryptFileOpenError;
}
// Make sure we can write to the socket.
if (!write_status_to_socket(0, socket)) {
LOG(ERROR) << "failed to write to socket " << socket;
return kUncryptSocketWriteError;
}
struct stat sb;
if (stat(path, &sb) != 0) {
LOG(ERROR) << "failed to stat " << path;
return kUncryptFileStatError;
}
LOG(INFO) << " block size: " << sb.st_blksize << " bytes";
int blocks = ((sb.st_size-1) / sb.st_blksize) + 1;
LOG(INFO) << " file size: " << sb.st_size << " bytes, " << blocks << " blocks";
std::vector<int> ranges;
std::string s = android::base::StringPrintf("%s\n%" PRId64 " %" PRId64 "\n",
blk_dev, static_cast<int64_t>(sb.st_size),
static_cast<int64_t>(sb.st_blksize));
if (!android::base::WriteStringToFd(s, mapfd)) {
PLOG(ERROR) << "failed to write " << tmp_map_file;
return kUncryptWriteError;
}
std::vector<std::vector<unsigned char>> buffers;
if (encrypted) {
buffers.resize(WINDOW_SIZE, std::vector<unsigned char>(sb.st_blksize));
}
int head_block = 0;
int head = 0, tail = 0;
android::base::unique_fd fd(open(path, O_RDONLY));
if (fd == -1) {
PLOG(ERROR) << "failed to open " << path << " for reading";
return kUncryptFileOpenError;
}
android::base::unique_fd wfd;
if (encrypted) {
wfd.reset(open(blk_dev, O_WRONLY));
if (wfd == -1) {
PLOG(ERROR) << "failed to open " << blk_dev << " for writing";
return kUncryptBlockOpenError;
}
}
// F2FS-specific ioctl
// It requires the below kernel commit merged in v4.16-rc1.
// 1ad71a27124c ("f2fs: add an ioctl to disable GC for specific file")
// In android-4.4,
// 56ee1e817908 ("f2fs: updates on v4.16-rc1")
// In android-4.9,
// 2f17e34672a8 ("f2fs: updates on v4.16-rc1")
// In android-4.14,
// ce767d9a55bc ("f2fs: updates on v4.16-rc1")
#ifndef F2FS_IOC_SET_PIN_FILE
#ifndef F2FS_IOCTL_MAGIC
#define F2FS_IOCTL_MAGIC 0xf5
#endif
#define F2FS_IOC_SET_PIN_FILE _IOW(F2FS_IOCTL_MAGIC, 13, __u32)
#define F2FS_IOC_GET_PIN_FILE _IOW(F2FS_IOCTL_MAGIC, 14, __u32)
#endif
if (f2fs_fs) {
int error = ioctl(fd, F2FS_IOC_SET_PIN_FILE);
// Don't break the old kernels which don't support it.
if (error && errno != ENOTTY && errno != ENOTSUP) {
PLOG(ERROR) << "Failed to set pin_file for f2fs: " << path << " on " << blk_dev;
return kUncryptIoctlError;
}
}
off64_t pos = 0;
int last_progress = 0;
while (pos < sb.st_size) {
// Update the status file, progress must be between [0, 99].
int progress = static_cast<int>(100 * (double(pos) / double(sb.st_size)));
if (progress > last_progress) {
last_progress = progress;
write_status_to_socket(progress, socket);
}
if ((tail+1) % WINDOW_SIZE == head) {
// write out head buffer
int block = head_block;
if (ioctl(fd, FIBMAP, &block) != 0) {
PLOG(ERROR) << "failed to find block " << head_block;
return kUncryptIoctlError;
}
if (block == 0) {
LOG(ERROR) << "failed to find block " << head_block << ", retrying";
int error = retry_fibmap(fd, path, &block, head_block);
if (error != kUncryptNoError) {
return error;
}
}
add_block_to_ranges(ranges, block);
if (encrypted) {
if (write_at_offset(buffers[head].data(), sb.st_blksize, wfd,
static_cast<off64_t>(sb.st_blksize) * block) != 0) {
return kUncryptWriteError;
}
}
head = (head + 1) % WINDOW_SIZE;
++head_block;
}
// read next block to tail
if (encrypted) {
size_t to_read = static_cast<size_t>(
std::min(static_cast<off64_t>(sb.st_blksize), sb.st_size - pos));
if (!android::base::ReadFully(fd, buffers[tail].data(), to_read)) {
PLOG(ERROR) << "failed to read " << path;
return kUncryptReadError;
}
pos += to_read;
} else {
// If we're not encrypting; we don't need to actually read
// anything, just skip pos forward as if we'd read a
// block.
pos += sb.st_blksize;
}
tail = (tail+1) % WINDOW_SIZE;
}
while (head != tail) {
// write out head buffer
int block = head_block;
if (ioctl(fd, FIBMAP, &block) != 0) {
PLOG(ERROR) << "failed to find block " << head_block;
return kUncryptIoctlError;
}
if (block == 0) {
LOG(ERROR) << "failed to find block " << head_block << ", retrying";
int error = retry_fibmap(fd, path, &block, head_block);
if (error != kUncryptNoError) {
return error;
}
}
add_block_to_ranges(ranges, block);
if (encrypted) {
if (write_at_offset(buffers[head].data(), sb.st_blksize, wfd,
static_cast<off64_t>(sb.st_blksize) * block) != 0) {
return kUncryptWriteError;
}
}
head = (head + 1) % WINDOW_SIZE;
++head_block;
}
if (!android::base::WriteStringToFd(
android::base::StringPrintf("%zu\n", ranges.size() / 2), mapfd)) {
PLOG(ERROR) << "failed to write " << tmp_map_file;
return kUncryptWriteError;
}
for (size_t i = 0; i < ranges.size(); i += 2) {
if (!android::base::WriteStringToFd(
android::base::StringPrintf("%d %d\n", ranges[i], ranges[i+1]), mapfd)) {
PLOG(ERROR) << "failed to write " << tmp_map_file;
return kUncryptWriteError;
}
}
if (fsync(mapfd) == -1) {
PLOG(ERROR) << "failed to fsync \"" << tmp_map_file << "\"";
return kUncryptFileSyncError;
}
if (close(mapfd.release()) == -1) {
PLOG(ERROR) << "failed to close " << tmp_map_file;
return kUncryptFileCloseError;
}
if (encrypted) {
if (fsync(wfd) == -1) {
PLOG(ERROR) << "failed to fsync \"" << blk_dev << "\"";
return kUncryptFileSyncError;
}
if (close(wfd.release()) == -1) {
PLOG(ERROR) << "failed to close " << blk_dev;
return kUncryptFileCloseError;
}
}
if (rename(tmp_map_file.c_str(), map_file) == -1) {
PLOG(ERROR) << "failed to rename " << tmp_map_file << " to " << map_file;
return kUncryptFileRenameError;
}
// Sync dir to make rename() result written to disk.
std::string file_name = map_file;
std::string dir_name = dirname(&file_name[0]);
android::base::unique_fd dfd(open(dir_name.c_str(), O_RDONLY | O_DIRECTORY));
if (dfd == -1) {
PLOG(ERROR) << "failed to open dir " << dir_name;
return kUncryptFileOpenError;
}
if (fsync(dfd) == -1) {
PLOG(ERROR) << "failed to fsync " << dir_name;
return kUncryptFileSyncError;
}
if (close(dfd.release()) == -1) {
PLOG(ERROR) << "failed to close " << dir_name;
return kUncryptFileCloseError;
}
return 0;
}
static int uncrypt(const char* input_path, const char* map_file, const int socket) {
LOG(INFO) << "update package is \"" << input_path << "\"";
// Turn the name of the file we're supposed to convert into an absolute path, so we can find
// what filesystem it's on.
char path[PATH_MAX+1];
if (realpath(input_path, path) == nullptr) {
PLOG(ERROR) << "failed to convert \"" << input_path << "\" to absolute path";
return kUncryptRealpathFindError;
}
bool encryptable;
bool encrypted;
bool f2fs_fs;
const char* blk_dev = find_block_device(path, &encryptable, &encrypted, &f2fs_fs);
if (blk_dev == nullptr) {
LOG(ERROR) << "failed to find block device for " << path;
return kUncryptBlockDeviceFindError;
}
// If the filesystem it's on isn't encrypted, we only produce the
// block map, we don't rewrite the file contents (it would be
// pointless to do so).
LOG(INFO) << "encryptable: " << (encryptable ? "yes" : "no");
LOG(INFO) << " encrypted: " << (encrypted ? "yes" : "no");
// Recovery supports installing packages from 3 paths: /cache,
// /data, and /sdcard. (On a particular device, other locations
// may work, but those are three we actually expect.)
//
// On /data we want to convert the file to a block map so that we
// can read the package without mounting the partition. On /cache
// and /sdcard we leave the file alone.
if (strncmp(path, "/data/", 6) == 0) {
LOG(INFO) << "writing block map " << map_file;
return produce_block_map(path, map_file, blk_dev, encrypted, f2fs_fs, socket);
}
return 0;
}
static void log_uncrypt_error_code(UncryptErrorCode error_code) {
if (!android::base::WriteStringToFile(android::base::StringPrintf(
"uncrypt_error: %d\n", error_code), UNCRYPT_STATUS)) {
PLOG(WARNING) << "failed to write to " << UNCRYPT_STATUS;
}
}
static bool uncrypt_wrapper(const char* input_path, const char* map_file, const int socket) {
// Initialize the uncrypt error to kUncryptErrorPlaceholder.
log_uncrypt_error_code(kUncryptErrorPlaceholder);
std::string package;
if (input_path == nullptr) {
if (!find_uncrypt_package(UNCRYPT_PATH_FILE, &package)) {
write_status_to_socket(-1, socket);
// Overwrite the error message.
log_uncrypt_error_code(kUncryptPackageMissingError);
return false;
}
input_path = package.c_str();
}
CHECK(map_file != nullptr);
auto start = std::chrono::system_clock::now();
int status = uncrypt(input_path, map_file, socket);
std::chrono::duration<double> duration = std::chrono::system_clock::now() - start;
int count = static_cast<int>(duration.count());
std::string uncrypt_message = android::base::StringPrintf("uncrypt_time: %d\n", count);
if (status != 0) {
// Log the time cost and error code if uncrypt fails.
uncrypt_message += android::base::StringPrintf("uncrypt_error: %d\n", status);
if (!android::base::WriteStringToFile(uncrypt_message, UNCRYPT_STATUS)) {
PLOG(WARNING) << "failed to write to " << UNCRYPT_STATUS;
}
write_status_to_socket(-1, socket);
return false;
}
if (!android::base::WriteStringToFile(uncrypt_message, UNCRYPT_STATUS)) {
PLOG(WARNING) << "failed to write to " << UNCRYPT_STATUS;
}
write_status_to_socket(100, socket);
return true;
}
static bool clear_bcb(const int socket) {
std::string err;
if (!clear_bootloader_message(&err)) {
LOG(ERROR) << "failed to clear bootloader message: " << err;
write_status_to_socket(-1, socket);
return false;
}
write_status_to_socket(100, socket);
return true;
}
static bool setup_bcb(const int socket) {
// c5. receive message length
int length;
if (!android::base::ReadFully(socket, &length, 4)) {
PLOG(ERROR) << "failed to read the length";
return false;
}
length = ntohl(length);
// c7. receive message
std::string content;
content.resize(length);
if (!android::base::ReadFully(socket, &content[0], length)) {
PLOG(ERROR) << "failed to read the message";
return false;
}
LOG(INFO) << " received command: [" << content << "] (" << content.size() << ")";
std::vector<std::string> options = android::base::Split(content, "\n");
std::string wipe_package;
for (auto& option : options) {
if (android::base::StartsWith(option, "--wipe_package=")) {
std::string path = option.substr(strlen("--wipe_package="));
if (!android::base::ReadFileToString(path, &wipe_package)) {
PLOG(ERROR) << "failed to read " << path;
return false;
}
option = android::base::StringPrintf("--wipe_package_size=%zu", wipe_package.size());
}
}
// c8. setup the bcb command
std::string err;
if (!write_bootloader_message(options, &err)) {
LOG(ERROR) << "failed to set bootloader message: " << err;
write_status_to_socket(-1, socket);
return false;
}
if (!wipe_package.empty() && !write_wipe_package(wipe_package, &err)) {
PLOG(ERROR) << "failed to set wipe package: " << err;
write_status_to_socket(-1, socket);
return false;
}
// c10. send "100" status
write_status_to_socket(100, socket);
return true;
}
static void usage(const char* exename) {
fprintf(stderr, "Usage of %s:\n", exename);
fprintf(stderr, "%s [<package_path> <map_file>] Uncrypt ota package.\n", exename);
fprintf(stderr, "%s --clear-bcb Clear BCB data in misc partition.\n", exename);
fprintf(stderr, "%s --setup-bcb Setup BCB data by command file.\n", exename);
}
int main(int argc, char** argv) {
enum { UNCRYPT, SETUP_BCB, CLEAR_BCB, UNCRYPT_DEBUG } action;
const char* input_path = nullptr;
const char* map_file = CACHE_BLOCK_MAP.c_str();
if (argc == 2 && strcmp(argv[1], "--clear-bcb") == 0) {
action = CLEAR_BCB;
} else if (argc == 2 && strcmp(argv[1], "--setup-bcb") == 0) {
action = SETUP_BCB;
} else if (argc == 1) {
action = UNCRYPT;
} else if (argc == 3) {
input_path = argv[1];
map_file = argv[2];
action = UNCRYPT_DEBUG;
} else {
usage(argv[0]);
return 2;
}
if ((fstab = read_fstab()) == nullptr) {
log_uncrypt_error_code(kUncryptFstabReadError);
return 1;
}
if (action == UNCRYPT_DEBUG) {
LOG(INFO) << "uncrypt called in debug mode, skip socket communication";
bool success = uncrypt_wrapper(input_path, map_file, -1);
if (success) {
LOG(INFO) << "uncrypt succeeded";
} else{
LOG(INFO) << "uncrypt failed";
}
return success ? 0 : 1;
}
// c3. The socket is created by init when starting the service. uncrypt
// will use the socket to communicate with its caller.
android::base::unique_fd service_socket(android_get_control_socket(UNCRYPT_SOCKET.c_str()));
if (service_socket == -1) {
PLOG(ERROR) << "failed to open socket \"" << UNCRYPT_SOCKET << "\"";
log_uncrypt_error_code(kUncryptSocketOpenError);
return 1;
}
fcntl(service_socket, F_SETFD, FD_CLOEXEC);
if (listen(service_socket, 1) == -1) {
PLOG(ERROR) << "failed to listen on socket " << service_socket.get();
log_uncrypt_error_code(kUncryptSocketListenError);
return 1;
}
android::base::unique_fd socket_fd(accept4(service_socket, nullptr, nullptr, SOCK_CLOEXEC));
if (socket_fd == -1) {
PLOG(ERROR) << "failed to accept on socket " << service_socket.get();
log_uncrypt_error_code(kUncryptSocketAcceptError);
return 1;
}
bool success = false;
switch (action) {
case UNCRYPT:
success = uncrypt_wrapper(input_path, map_file, socket_fd);
break;
case SETUP_BCB:
success = setup_bcb(socket_fd);
break;
case CLEAR_BCB:
success = clear_bcb(socket_fd);
break;
default: // Should never happen.
LOG(ERROR) << "Invalid uncrypt action code: " << action;
return 1;
}
// c13. Read a 4-byte code from the client before uncrypt exits. This is to
// ensure the client to receive the last status code before the socket gets
// destroyed.
int code;
if (android::base::ReadFully(socket_fd, &code, 4)) {
LOG(INFO) << " received " << code << ", exiting now";
} else {
PLOG(ERROR) << "failed to read the code";
}
return success ? 0 : 1;
}
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