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Doug Zongker76adfc52014-01-13 10:04:25 -08001/*
2 * Copyright (C) 2014 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// This program takes a file on an ext4 filesystem and produces a list
18// of the blocks that file occupies, which enables the file contents
19// to be read directly from the block device without mounting the
20// filesystem.
21//
22// If the filesystem is using an encrypted block device, it will also
23// read the file and rewrite it to the same blocks of the underlying
24// (unencrypted) block device, so the file contents can be read
25// without the need for the decryption key.
26//
27// The output of this program is a "block map" which looks like this:
28//
29// /dev/block/platform/msm_sdcc.1/by-name/userdata # block device
30// 49652 4096 # file size in bytes, block size
31// 3 # count of block ranges
32// 1000 1008 # block range 0
33// 2100 2102 # ... block range 1
34// 30 33 # ... block range 2
35//
36// Each block range represents a half-open interval; the line "30 33"
37// reprents the blocks [30, 31, 32].
38//
39// Recovery can take this block map file and retrieve the underlying
40// file data to use as an update package.
41
Tao Bao3a2bb592016-02-25 12:38:53 -080042/**
43 * In addition to the uncrypt work, uncrypt also takes care of setting and
44 * clearing the bootloader control block (BCB) at /misc partition.
45 *
46 * uncrypt is triggered as init services on demand. It uses socket to
47 * communicate with its caller (i.e. system_server). The socket is managed by
48 * init (i.e. created prior to the service starts, and destroyed when uncrypt
49 * exits).
50 *
51 * Below is the uncrypt protocol.
52 *
53 * a. caller b. init c. uncrypt
54 * --------------- ------------ --------------
55 * a1. ctl.start:
56 * setup-bcb /
57 * clear-bcb /
58 * uncrypt
59 *
60 * b2. create socket at
61 * /dev/socket/uncrypt
62 *
63 * c3. listen and accept
64 *
65 * a4. send a 4-byte int
66 * (message length)
67 * c5. receive message length
68 * a6. send message
69 * c7. receive message
70 * c8. <do the work; may send
71 * the progress>
72 * a9. <may handle progress>
73 * c10. <upon finishing>
74 * send "100" or "-1"
75 *
76 * a11. receive status code
77 * a12. send a 4-byte int to
78 * ack the receive of the
79 * final status code
80 * c13. receive and exit
81 *
82 * b14. destroy the socket
83 *
84 * Note that a12 and c13 are necessary to ensure a11 happens before the socket
85 * gets destroyed in b14.
86 */
87
88#include <arpa/inet.h>
Elliott Hughesd4d4c242014-12-29 12:46:43 -080089#include <errno.h>
Tao Bao75238632015-05-27 14:46:17 -070090#include <fcntl.h>
Tao Baob8df5fb2015-12-08 22:47:25 -080091#include <inttypes.h>
Yabin Cui25dd0382016-02-01 11:40:37 -080092#include <libgen.h>
Tao Bao75238632015-05-27 14:46:17 -070093#include <linux/fs.h>
94#include <stdarg.h>
Doug Zongker76adfc52014-01-13 10:04:25 -080095#include <stdio.h>
96#include <stdlib.h>
Elliott Hughescd3c55a2015-01-29 20:50:08 -080097#include <string.h>
Doug Zongker76adfc52014-01-13 10:04:25 -080098#include <sys/mman.h>
Tao Bao3a2bb592016-02-25 12:38:53 -080099#include <sys/socket.h>
Tao Bao383b00d2015-05-21 16:44:44 -0700100#include <sys/stat.h>
101#include <sys/types.h>
Tao Bao75238632015-05-27 14:46:17 -0700102#include <unistd.h>
Doug Zongker76adfc52014-01-13 10:04:25 -0800103
Yabin Cui25dd0382016-02-01 11:40:37 -0800104#include <algorithm>
Tao Baoc7547922015-08-06 18:35:05 -0700105#include <memory>
Yabin Cui25dd0382016-02-01 11:40:37 -0800106#include <vector>
Tao Baoc7547922015-08-06 18:35:05 -0700107
Elliott Hughes4b166f02015-12-04 15:30:20 -0800108#include <android-base/file.h>
Yabin Cui2d46da52016-01-26 16:50:15 -0800109#include <android-base/logging.h>
Elliott Hughescb220402016-09-23 15:30:55 -0700110#include <android-base/properties.h>
Yabin Cui25dd0382016-02-01 11:40:37 -0800111#include <android-base/stringprintf.h>
Elliott Hughes4b166f02015-12-04 15:30:20 -0800112#include <android-base/strings.h>
Elliott Hughesbcabd092016-03-22 20:19:22 -0700113#include <android-base/unique_fd.h>
Yabin Cui2f272c02016-06-24 18:22:02 -0700114#include <bootloader_message/bootloader_message.h>
Tao Bao75238632015-05-27 14:46:17 -0700115#include <cutils/android_reboot.h>
Tao Bao3a2bb592016-02-25 12:38:53 -0800116#include <cutils/sockets.h>
Doug Zongker76adfc52014-01-13 10:04:25 -0800117#include <fs_mgr.h>
118
Tianjie Xuda44cf12016-09-24 15:31:34 -0700119#include "error_code.h"
120
Doug Zongker76adfc52014-01-13 10:04:25 -0800121#define WINDOW_SIZE 5
Tao Bao383b00d2015-05-21 16:44:44 -0700122
Tao Bao3a2bb592016-02-25 12:38:53 -0800123// uncrypt provides three services: SETUP_BCB, CLEAR_BCB and UNCRYPT.
124//
125// SETUP_BCB and CLEAR_BCB services use socket communication and do not rely
126// on /cache partitions. They will handle requests to reboot into recovery
127// (for applying updates for non-A/B devices, or factory resets for all
128// devices).
129//
130// UNCRYPT service still needs files on /cache partition (UNCRYPT_PATH_FILE
131// and CACHE_BLOCK_MAP). It will be working (and needed) only for non-A/B
132// devices, on which /cache partitions always exist.
Yabin Cui2d46da52016-01-26 16:50:15 -0800133static const std::string CACHE_BLOCK_MAP = "/cache/recovery/block.map";
Yabin Cui2d46da52016-01-26 16:50:15 -0800134static const std::string UNCRYPT_PATH_FILE = "/cache/recovery/uncrypt_file";
Tianjie Xue16e7992016-09-09 10:55:44 -0700135static const std::string UNCRYPT_STATUS = "/cache/recovery/uncrypt_status";
Tao Bao3a2bb592016-02-25 12:38:53 -0800136static const std::string UNCRYPT_SOCKET = "uncrypt";
Doug Zongker76adfc52014-01-13 10:04:25 -0800137
Tao Bao3a2bb592016-02-25 12:38:53 -0800138static struct fstab* fstab = nullptr;
Doug Zongker2efc9d92014-08-18 15:55:28 -0700139
Tao Bao381f4552015-05-05 18:36:45 -0700140static int write_at_offset(unsigned char* buffer, size_t size, int wfd, off64_t offset) {
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700141 if (TEMP_FAILURE_RETRY(lseek64(wfd, offset, SEEK_SET)) == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700142 PLOG(ERROR) << "error seeking to offset " << offset;
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700143 return -1;
144 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800145 if (!android::base::WriteFully(wfd, buffer, size)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700146 PLOG(ERROR) << "error writing offset " << offset;
Yabin Cui25dd0382016-02-01 11:40:37 -0800147 return -1;
Doug Zongker76adfc52014-01-13 10:04:25 -0800148 }
149 return 0;
150}
151
Yabin Cui25dd0382016-02-01 11:40:37 -0800152static void add_block_to_ranges(std::vector<int>& ranges, int new_block) {
153 if (!ranges.empty() && new_block == ranges.back()) {
Doug Zongker76adfc52014-01-13 10:04:25 -0800154 // If the new block comes immediately after the current range,
155 // all we have to do is extend the current range.
Yabin Cui25dd0382016-02-01 11:40:37 -0800156 ++ranges.back();
Doug Zongker76adfc52014-01-13 10:04:25 -0800157 } else {
158 // We need to start a new range.
Yabin Cui25dd0382016-02-01 11:40:37 -0800159 ranges.push_back(new_block);
160 ranges.push_back(new_block + 1);
Doug Zongker76adfc52014-01-13 10:04:25 -0800161 }
162}
163
Tao Bao381f4552015-05-05 18:36:45 -0700164static struct fstab* read_fstab() {
Doug Zongker2efc9d92014-08-18 15:55:28 -0700165 fstab = NULL;
166
Doug Zongker76adfc52014-01-13 10:04:25 -0800167 // The fstab path is always "/fstab.${ro.hardware}".
Elliott Hughescb220402016-09-23 15:30:55 -0700168 std::string ro_hardware = android::base::GetProperty("ro.hardware", "");
169 if (ro_hardware.empty()) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700170 LOG(ERROR) << "failed to get ro.hardware";
Doug Zongker76adfc52014-01-13 10:04:25 -0800171 return NULL;
172 }
173
Elliott Hughescb220402016-09-23 15:30:55 -0700174 std::string fstab_path = "/fstab." + ro_hardware;
175
176 fstab = fs_mgr_read_fstab(fstab_path.c_str());
Doug Zongker76adfc52014-01-13 10:04:25 -0800177 if (!fstab) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700178 LOG(ERROR) << "failed to read " << fstab_path;
Doug Zongker76adfc52014-01-13 10:04:25 -0800179 return NULL;
180 }
181
Doug Zongker2efc9d92014-08-18 15:55:28 -0700182 return fstab;
183}
184
Tao Bao381f4552015-05-05 18:36:45 -0700185static const char* find_block_device(const char* path, bool* encryptable, bool* encrypted) {
Doug Zongker76adfc52014-01-13 10:04:25 -0800186 // Look for a volume whose mount point is the prefix of path and
187 // return its block device. Set encrypted if it's currently
188 // encrypted.
Tao Bao381f4552015-05-05 18:36:45 -0700189 for (int i = 0; i < fstab->num_entries; ++i) {
Doug Zongker76adfc52014-01-13 10:04:25 -0800190 struct fstab_rec* v = &fstab->recs[i];
Tao Bao381f4552015-05-05 18:36:45 -0700191 if (!v->mount_point) {
192 continue;
193 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800194 int len = strlen(v->mount_point);
195 if (strncmp(path, v->mount_point, len) == 0 &&
196 (path[len] == '/' || path[len] == 0)) {
Tao Bao381f4552015-05-05 18:36:45 -0700197 *encrypted = false;
198 *encryptable = false;
Tao Bao7cf50c62015-07-16 20:04:13 -0700199 if (fs_mgr_is_encryptable(v) || fs_mgr_is_file_encrypted(v)) {
Tao Bao381f4552015-05-05 18:36:45 -0700200 *encryptable = true;
Elliott Hughescb220402016-09-23 15:30:55 -0700201 if (android::base::GetProperty("ro.crypto.state", "") == "encrypted") {
Tao Bao381f4552015-05-05 18:36:45 -0700202 *encrypted = true;
Doug Zongker76adfc52014-01-13 10:04:25 -0800203 }
204 }
205 return v->blk_device;
206 }
207 }
208
209 return NULL;
210}
211
Tao Bao3a2bb592016-02-25 12:38:53 -0800212static bool write_status_to_socket(int status, int socket) {
213 int status_out = htonl(status);
214 return android::base::WriteFully(socket, &status_out, sizeof(int));
215}
216
Tao Bao383b00d2015-05-21 16:44:44 -0700217// Parse uncrypt_file to find the update package name.
Yabin Cui2d46da52016-01-26 16:50:15 -0800218static bool find_uncrypt_package(const std::string& uncrypt_path_file, std::string* package_name) {
219 CHECK(package_name != nullptr);
220 std::string uncrypt_path;
221 if (!android::base::ReadFileToString(uncrypt_path_file, &uncrypt_path)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700222 PLOG(ERROR) << "failed to open \"" << uncrypt_path_file << "\"";
Tao Bao383b00d2015-05-21 16:44:44 -0700223 return false;
Maxim Siniavinee7b28882014-02-13 15:48:53 -0800224 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800225
Tao Bao383b00d2015-05-21 16:44:44 -0700226 // Remove the trailing '\n' if present.
Yabin Cui2d46da52016-01-26 16:50:15 -0800227 *package_name = android::base::Trim(uncrypt_path);
Tao Bao383b00d2015-05-21 16:44:44 -0700228 return true;
Doug Zongker76adfc52014-01-13 10:04:25 -0800229}
230
Tao Bao381f4552015-05-05 18:36:45 -0700231static int produce_block_map(const char* path, const char* map_file, const char* blk_dev,
Tao Bao3a2bb592016-02-25 12:38:53 -0800232 bool encrypted, int socket) {
Yabin Cui25dd0382016-02-01 11:40:37 -0800233 std::string err;
234 if (!android::base::RemoveFileIfExists(map_file, &err)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700235 LOG(ERROR) << "failed to remove the existing map file " << map_file << ": " << err;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700236 return kUncryptFileRemoveError;
Sungmin Choia72512c2014-12-10 21:57:09 +0900237 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800238 std::string tmp_map_file = std::string(map_file) + ".tmp";
Elliott Hughesbcabd092016-03-22 20:19:22 -0700239 android::base::unique_fd mapfd(open(tmp_map_file.c_str(),
240 O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR));
241 if (mapfd == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700242 PLOG(ERROR) << "failed to open " << tmp_map_file;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700243 return kUncryptFileOpenError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800244 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800245
Tao Bao3a2bb592016-02-25 12:38:53 -0800246 // Make sure we can write to the socket.
247 if (!write_status_to_socket(0, socket)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700248 LOG(ERROR) << "failed to write to socket " << socket;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700249 return kUncryptSocketWriteError;
Tao Bao383b00d2015-05-21 16:44:44 -0700250 }
251
Tao Bao381f4552015-05-05 18:36:45 -0700252 struct stat sb;
Tao Baoc7547922015-08-06 18:35:05 -0700253 if (stat(path, &sb) != 0) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700254 LOG(ERROR) << "failed to stat " << path;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700255 return kUncryptFileStatError;
Doug Zongker76adfc52014-01-13 10:04:25 -0800256 }
257
Tianjie Xuc21edd42016-08-05 18:00:04 -0700258 LOG(INFO) << " block size: " << sb.st_blksize << " bytes";
Doug Zongker76adfc52014-01-13 10:04:25 -0800259
260 int blocks = ((sb.st_size-1) / sb.st_blksize) + 1;
Tianjie Xuc21edd42016-08-05 18:00:04 -0700261 LOG(INFO) << " file size: " << sb.st_size << " bytes, " << blocks << " blocks";
Doug Zongker76adfc52014-01-13 10:04:25 -0800262
Yabin Cui25dd0382016-02-01 11:40:37 -0800263 std::vector<int> ranges;
Doug Zongker76adfc52014-01-13 10:04:25 -0800264
Chih-Hung Hsieh54a27472016-04-18 11:30:55 -0700265 std::string s = android::base::StringPrintf("%s\n%" PRId64 " %" PRId64 "\n",
266 blk_dev, static_cast<int64_t>(sb.st_size),
267 static_cast<int64_t>(sb.st_blksize));
Elliott Hughesbcabd092016-03-22 20:19:22 -0700268 if (!android::base::WriteStringToFd(s, mapfd)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700269 PLOG(ERROR) << "failed to write " << tmp_map_file;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700270 return kUncryptWriteError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800271 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800272
Yabin Cui25dd0382016-02-01 11:40:37 -0800273 std::vector<std::vector<unsigned char>> buffers;
Doug Zongker76adfc52014-01-13 10:04:25 -0800274 if (encrypted) {
Yabin Cui25dd0382016-02-01 11:40:37 -0800275 buffers.resize(WINDOW_SIZE, std::vector<unsigned char>(sb.st_blksize));
Doug Zongker76adfc52014-01-13 10:04:25 -0800276 }
277 int head_block = 0;
278 int head = 0, tail = 0;
Doug Zongker76adfc52014-01-13 10:04:25 -0800279
Elliott Hughesbcabd092016-03-22 20:19:22 -0700280 android::base::unique_fd fd(open(path, O_RDONLY));
281 if (fd == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700282 PLOG(ERROR) << "failed to open " << path << " for reading";
Tianjie Xuda44cf12016-09-24 15:31:34 -0700283 return kUncryptFileOpenError;
Doug Zongker76adfc52014-01-13 10:04:25 -0800284 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800285
Elliott Hughesbcabd092016-03-22 20:19:22 -0700286 android::base::unique_fd wfd;
Doug Zongker76adfc52014-01-13 10:04:25 -0800287 if (encrypted) {
Elliott Hughesbcabd092016-03-22 20:19:22 -0700288 wfd.reset(open(blk_dev, O_WRONLY));
289 if (wfd == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700290 PLOG(ERROR) << "failed to open " << blk_dev << " for writing";
Tianjie Xuda44cf12016-09-24 15:31:34 -0700291 return kUncryptBlockOpenError;
Doug Zongker76adfc52014-01-13 10:04:25 -0800292 }
293 }
294
Tao Baob8df5fb2015-12-08 22:47:25 -0800295 off64_t pos = 0;
Tao Bao383b00d2015-05-21 16:44:44 -0700296 int last_progress = 0;
Doug Zongker76adfc52014-01-13 10:04:25 -0800297 while (pos < sb.st_size) {
Tao Bao383b00d2015-05-21 16:44:44 -0700298 // Update the status file, progress must be between [0, 99].
299 int progress = static_cast<int>(100 * (double(pos) / double(sb.st_size)));
300 if (progress > last_progress) {
Tao Bao3a2bb592016-02-25 12:38:53 -0800301 last_progress = progress;
302 write_status_to_socket(progress, socket);
Tao Bao383b00d2015-05-21 16:44:44 -0700303 }
304
Doug Zongker76adfc52014-01-13 10:04:25 -0800305 if ((tail+1) % WINDOW_SIZE == head) {
306 // write out head buffer
307 int block = head_block;
Elliott Hughesbcabd092016-03-22 20:19:22 -0700308 if (ioctl(fd, FIBMAP, &block) != 0) {
Tianjie Xuda44cf12016-09-24 15:31:34 -0700309 PLOG(ERROR) << "failed to find block " << head_block;
310 return kUncryptIoctlError;
Doug Zongker76adfc52014-01-13 10:04:25 -0800311 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800312 add_block_to_ranges(ranges, block);
Doug Zongker76adfc52014-01-13 10:04:25 -0800313 if (encrypted) {
Elliott Hughesbcabd092016-03-22 20:19:22 -0700314 if (write_at_offset(buffers[head].data(), sb.st_blksize, wfd,
315 static_cast<off64_t>(sb.st_blksize) * block) != 0) {
Tianjie Xuda44cf12016-09-24 15:31:34 -0700316 return kUncryptWriteError;
Doug Zongker76adfc52014-01-13 10:04:25 -0800317 }
318 }
319 head = (head + 1) % WINDOW_SIZE;
320 ++head_block;
321 }
322
323 // read next block to tail
324 if (encrypted) {
Yabin Cui25dd0382016-02-01 11:40:37 -0800325 size_t to_read = static_cast<size_t>(
326 std::min(static_cast<off64_t>(sb.st_blksize), sb.st_size - pos));
Elliott Hughesbcabd092016-03-22 20:19:22 -0700327 if (!android::base::ReadFully(fd, buffers[tail].data(), to_read)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700328 PLOG(ERROR) << "failed to read " << path;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700329 return kUncryptReadError;
Doug Zongker76adfc52014-01-13 10:04:25 -0800330 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800331 pos += to_read;
Doug Zongker76adfc52014-01-13 10:04:25 -0800332 } else {
333 // If we're not encrypting; we don't need to actually read
334 // anything, just skip pos forward as if we'd read a
335 // block.
336 pos += sb.st_blksize;
337 }
338 tail = (tail+1) % WINDOW_SIZE;
339 }
340
341 while (head != tail) {
342 // write out head buffer
343 int block = head_block;
Elliott Hughesbcabd092016-03-22 20:19:22 -0700344 if (ioctl(fd, FIBMAP, &block) != 0) {
Tianjie Xuda44cf12016-09-24 15:31:34 -0700345 PLOG(ERROR) << "failed to find block " << head_block;
346 return kUncryptIoctlError;
Doug Zongker76adfc52014-01-13 10:04:25 -0800347 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800348 add_block_to_ranges(ranges, block);
Doug Zongker76adfc52014-01-13 10:04:25 -0800349 if (encrypted) {
Elliott Hughesbcabd092016-03-22 20:19:22 -0700350 if (write_at_offset(buffers[head].data(), sb.st_blksize, wfd,
351 static_cast<off64_t>(sb.st_blksize) * block) != 0) {
Tianjie Xuda44cf12016-09-24 15:31:34 -0700352 return kUncryptWriteError;
Doug Zongker76adfc52014-01-13 10:04:25 -0800353 }
354 }
355 head = (head + 1) % WINDOW_SIZE;
356 ++head_block;
357 }
358
Yabin Cui25dd0382016-02-01 11:40:37 -0800359 if (!android::base::WriteStringToFd(
Elliott Hughesbcabd092016-03-22 20:19:22 -0700360 android::base::StringPrintf("%zu\n", ranges.size() / 2), mapfd)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700361 PLOG(ERROR) << "failed to write " << tmp_map_file;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700362 return kUncryptWriteError;
Tao Baofb4ccef2015-05-04 10:10:13 -0700363 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800364 for (size_t i = 0; i < ranges.size(); i += 2) {
365 if (!android::base::WriteStringToFd(
Elliott Hughesbcabd092016-03-22 20:19:22 -0700366 android::base::StringPrintf("%d %d\n", ranges[i], ranges[i+1]), mapfd)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700367 PLOG(ERROR) << "failed to write " << tmp_map_file;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700368 return kUncryptWriteError;
Tao Baofb4ccef2015-05-04 10:10:13 -0700369 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800370 }
371
Elliott Hughesbcabd092016-03-22 20:19:22 -0700372 if (fsync(mapfd) == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700373 PLOG(ERROR) << "failed to fsync \"" << tmp_map_file << "\"";
Tianjie Xuda44cf12016-09-24 15:31:34 -0700374 return kUncryptFileSyncError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800375 }
Elliott Hughesbcabd092016-03-22 20:19:22 -0700376 if (close(mapfd.release()) == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700377 PLOG(ERROR) << "failed to close " << tmp_map_file;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700378 return kUncryptFileCloseError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800379 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800380
381 if (encrypted) {
Elliott Hughesbcabd092016-03-22 20:19:22 -0700382 if (fsync(wfd) == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700383 PLOG(ERROR) << "failed to fsync \"" << blk_dev << "\"";
Tianjie Xuda44cf12016-09-24 15:31:34 -0700384 return kUncryptFileSyncError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800385 }
Elliott Hughesbcabd092016-03-22 20:19:22 -0700386 if (close(wfd.release()) == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700387 PLOG(ERROR) << "failed to close " << blk_dev;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700388 return kUncryptFileCloseError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800389 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800390 }
391
392 if (rename(tmp_map_file.c_str(), map_file) == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700393 PLOG(ERROR) << "failed to rename " << tmp_map_file << " to " << map_file;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700394 return kUncryptFileRenameError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800395 }
396 // Sync dir to make rename() result written to disk.
397 std::string file_name = map_file;
398 std::string dir_name = dirname(&file_name[0]);
Elliott Hughesbcabd092016-03-22 20:19:22 -0700399 android::base::unique_fd dfd(open(dir_name.c_str(), O_RDONLY | O_DIRECTORY));
400 if (dfd == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700401 PLOG(ERROR) << "failed to open dir " << dir_name;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700402 return kUncryptFileOpenError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800403 }
Elliott Hughesbcabd092016-03-22 20:19:22 -0700404 if (fsync(dfd) == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700405 PLOG(ERROR) << "failed to fsync " << dir_name;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700406 return kUncryptFileSyncError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800407 }
Elliott Hughesbcabd092016-03-22 20:19:22 -0700408 if (close(dfd.release()) == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700409 PLOG(ERROR) << "failed to close " << dir_name;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700410 return kUncryptFileCloseError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800411 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800412 return 0;
413}
414
Tao Bao3a2bb592016-02-25 12:38:53 -0800415static int uncrypt(const char* input_path, const char* map_file, const int socket) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700416 LOG(INFO) << "update package is \"" << input_path << "\"";
Doug Zongkerf449db22014-08-26 09:15:08 -0700417
Doug Zongker76adfc52014-01-13 10:04:25 -0800418 // Turn the name of the file we're supposed to convert into an
419 // absolute path, so we can find what filesystem it's on.
420 char path[PATH_MAX+1];
421 if (realpath(input_path, path) == NULL) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700422 PLOG(ERROR) << "failed to convert \"" << input_path << "\" to absolute path";
Doug Zongker76adfc52014-01-13 10:04:25 -0800423 return 1;
424 }
425
Tao Bao381f4552015-05-05 18:36:45 -0700426 bool encryptable;
427 bool encrypted;
Doug Zongker76adfc52014-01-13 10:04:25 -0800428 const char* blk_dev = find_block_device(path, &encryptable, &encrypted);
429 if (blk_dev == NULL) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700430 LOG(ERROR) << "failed to find block device for " << path;
Doug Zongker76adfc52014-01-13 10:04:25 -0800431 return 1;
432 }
433
434 // If the filesystem it's on isn't encrypted, we only produce the
435 // block map, we don't rewrite the file contents (it would be
436 // pointless to do so).
Tianjie Xuc21edd42016-08-05 18:00:04 -0700437 LOG(INFO) << "encryptable: " << (encryptable ? "yes" : "no");
438 LOG(INFO) << " encrypted: " << (encrypted ? "yes" : "no");
Doug Zongker76adfc52014-01-13 10:04:25 -0800439
Doug Zongker574443d2014-09-05 08:22:12 -0700440 // Recovery supports installing packages from 3 paths: /cache,
441 // /data, and /sdcard. (On a particular device, other locations
442 // may work, but those are three we actually expect.)
443 //
444 // On /data we want to convert the file to a block map so that we
445 // can read the package without mounting the partition. On /cache
446 // and /sdcard we leave the file alone.
Tao Bao383b00d2015-05-21 16:44:44 -0700447 if (strncmp(path, "/data/", 6) == 0) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700448 LOG(INFO) << "writing block map " << map_file;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700449 return produce_block_map(path, map_file, blk_dev, encrypted, socket);
Tao Bao383b00d2015-05-21 16:44:44 -0700450 }
451
452 return 0;
453}
454
Tianjie Xu68fc81e2016-09-24 15:31:34 -0700455static void log_uncrypt_error_code(UncryptErrorCode error_code) {
Tianjie Xuda44cf12016-09-24 15:31:34 -0700456 if (!android::base::WriteStringToFile(android::base::StringPrintf(
Tianjie Xu68fc81e2016-09-24 15:31:34 -0700457 "uncrypt_error: %d\n", error_code), UNCRYPT_STATUS)) {
Tianjie Xuda44cf12016-09-24 15:31:34 -0700458 PLOG(WARNING) << "failed to write to " << UNCRYPT_STATUS;
459 }
Tianjie Xu68fc81e2016-09-24 15:31:34 -0700460}
461
462static bool uncrypt_wrapper(const char* input_path, const char* map_file, const int socket) {
463 // Initialize the uncrypt error to kUncryptErrorPlaceholder.
464 log_uncrypt_error_code(kUncryptErrorPlaceholder);
Tianjie Xuda44cf12016-09-24 15:31:34 -0700465
Yabin Cui2d46da52016-01-26 16:50:15 -0800466 std::string package;
467 if (input_path == nullptr) {
468 if (!find_uncrypt_package(UNCRYPT_PATH_FILE, &package)) {
Tao Bao3a2bb592016-02-25 12:38:53 -0800469 write_status_to_socket(-1, socket);
Tianjie Xuda44cf12016-09-24 15:31:34 -0700470 // Overwrite the error message.
Tianjie Xu68fc81e2016-09-24 15:31:34 -0700471 log_uncrypt_error_code(kUncryptPackageMissingError);
Tao Bao3a2bb592016-02-25 12:38:53 -0800472 return false;
Yabin Cui2d46da52016-01-26 16:50:15 -0800473 }
474 input_path = package.c_str();
475 }
476 CHECK(map_file != nullptr);
Tianjie Xue16e7992016-09-09 10:55:44 -0700477
Tianjie Xue16e7992016-09-09 10:55:44 -0700478 auto start = std::chrono::system_clock::now();
Tao Bao3a2bb592016-02-25 12:38:53 -0800479 int status = uncrypt(input_path, map_file, socket);
Tianjie Xuda44cf12016-09-24 15:31:34 -0700480 std::chrono::duration<double> duration = std::chrono::system_clock::now() - start;
481 int count = static_cast<int>(duration.count());
482
483 std::string uncrypt_message = android::base::StringPrintf("uncrypt_time: %d\n", count);
Yabin Cui2d46da52016-01-26 16:50:15 -0800484 if (status != 0) {
Tianjie Xuda44cf12016-09-24 15:31:34 -0700485 // Log the time cost and error code if uncrypt fails.
486 uncrypt_message += android::base::StringPrintf("uncrypt_error: %d\n", status);
487 if (!android::base::WriteStringToFile(uncrypt_message, UNCRYPT_STATUS)) {
488 PLOG(WARNING) << "failed to write to " << UNCRYPT_STATUS;
489 }
490
Tao Bao3a2bb592016-02-25 12:38:53 -0800491 write_status_to_socket(-1, socket);
492 return false;
Yabin Cui2d46da52016-01-26 16:50:15 -0800493 }
Tianjie Xue16e7992016-09-09 10:55:44 -0700494
Tianjie Xuda44cf12016-09-24 15:31:34 -0700495 if (!android::base::WriteStringToFile(uncrypt_message, UNCRYPT_STATUS)) {
Tianjie Xue16e7992016-09-09 10:55:44 -0700496 PLOG(WARNING) << "failed to write to " << UNCRYPT_STATUS;
497 }
498
Tao Bao3a2bb592016-02-25 12:38:53 -0800499 write_status_to_socket(100, socket);
Tianjie Xue16e7992016-09-09 10:55:44 -0700500
Tao Bao3a2bb592016-02-25 12:38:53 -0800501 return true;
Yabin Cui2d46da52016-01-26 16:50:15 -0800502}
503
Tao Bao3a2bb592016-02-25 12:38:53 -0800504static bool clear_bcb(const int socket) {
Yabin Cuia58a6db2016-04-06 15:52:18 -0700505 std::string err;
506 if (!clear_bootloader_message(&err)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700507 LOG(ERROR) << "failed to clear bootloader message: " << err;
Tao Bao3a2bb592016-02-25 12:38:53 -0800508 write_status_to_socket(-1, socket);
509 return false;
Yabin Cui2d46da52016-01-26 16:50:15 -0800510 }
Tao Bao3a2bb592016-02-25 12:38:53 -0800511 write_status_to_socket(100, socket);
512 return true;
Yabin Cui2d46da52016-01-26 16:50:15 -0800513}
514
Tao Bao3a2bb592016-02-25 12:38:53 -0800515static bool setup_bcb(const int socket) {
516 // c5. receive message length
517 int length;
518 if (!android::base::ReadFully(socket, &length, 4)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700519 PLOG(ERROR) << "failed to read the length";
Tao Bao3a2bb592016-02-25 12:38:53 -0800520 return false;
Yabin Cui2d46da52016-01-26 16:50:15 -0800521 }
Tao Bao3a2bb592016-02-25 12:38:53 -0800522 length = ntohl(length);
523
524 // c7. receive message
Yabin Cui2d46da52016-01-26 16:50:15 -0800525 std::string content;
Tao Bao3a2bb592016-02-25 12:38:53 -0800526 content.resize(length);
527 if (!android::base::ReadFully(socket, &content[0], length)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700528 PLOG(ERROR) << "failed to read the length";
Tao Bao3a2bb592016-02-25 12:38:53 -0800529 return false;
Yabin Cui2d46da52016-01-26 16:50:15 -0800530 }
Tianjie Xuc21edd42016-08-05 18:00:04 -0700531 LOG(INFO) << " received command: [" << content << "] (" << content.size() << ")";
Yabin Cui6faf0262016-06-09 14:09:39 -0700532 std::vector<std::string> options = android::base::Split(content, "\n");
533 std::string wipe_package;
534 for (auto& option : options) {
535 if (android::base::StartsWith(option, "--wipe_package=")) {
536 std::string path = option.substr(strlen("--wipe_package="));
537 if (!android::base::ReadFileToString(path, &wipe_package)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700538 PLOG(ERROR) << "failed to read " << path;
Yabin Cui6faf0262016-06-09 14:09:39 -0700539 return false;
540 }
541 option = android::base::StringPrintf("--wipe_package_size=%zu", wipe_package.size());
542 }
543 }
Tao Bao3a2bb592016-02-25 12:38:53 -0800544
545 // c8. setup the bcb command
Yabin Cuia58a6db2016-04-06 15:52:18 -0700546 std::string err;
Yabin Cui6faf0262016-06-09 14:09:39 -0700547 if (!write_bootloader_message(options, &err)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700548 LOG(ERROR) << "failed to set bootloader message: " << err;
Tao Bao3a2bb592016-02-25 12:38:53 -0800549 write_status_to_socket(-1, socket);
550 return false;
Yabin Cui2d46da52016-01-26 16:50:15 -0800551 }
Yabin Cui6faf0262016-06-09 14:09:39 -0700552 if (!wipe_package.empty() && !write_wipe_package(wipe_package, &err)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700553 PLOG(ERROR) << "failed to set wipe package: " << err;
Yabin Cui6faf0262016-06-09 14:09:39 -0700554 write_status_to_socket(-1, socket);
555 return false;
556 }
Tao Bao3a2bb592016-02-25 12:38:53 -0800557 // c10. send "100" status
558 write_status_to_socket(100, socket);
559 return true;
Yabin Cui2d46da52016-01-26 16:50:15 -0800560}
561
Yabin Cui2d46da52016-01-26 16:50:15 -0800562static void usage(const char* exename) {
563 fprintf(stderr, "Usage of %s:\n", exename);
564 fprintf(stderr, "%s [<package_path> <map_file>] Uncrypt ota package.\n", exename);
Yabin Cui2d46da52016-01-26 16:50:15 -0800565 fprintf(stderr, "%s --clear-bcb Clear BCB data in misc partition.\n", exename);
566 fprintf(stderr, "%s --setup-bcb Setup BCB data by command file.\n", exename);
Yabin Cui2d46da52016-01-26 16:50:15 -0800567}
568
569int main(int argc, char** argv) {
Tao Bao3a2bb592016-02-25 12:38:53 -0800570 enum { UNCRYPT, SETUP_BCB, CLEAR_BCB } action;
571 const char* input_path = nullptr;
572 const char* map_file = CACHE_BLOCK_MAP.c_str();
573
574 if (argc == 2 && strcmp(argv[1], "--clear-bcb") == 0) {
575 action = CLEAR_BCB;
576 } else if (argc == 2 && strcmp(argv[1], "--setup-bcb") == 0) {
577 action = SETUP_BCB;
Tao Bao3a2bb592016-02-25 12:38:53 -0800578 } else if (argc == 1) {
579 action = UNCRYPT;
580 } else if (argc == 3) {
581 input_path = argv[1];
582 map_file = argv[2];
583 action = UNCRYPT;
584 } else {
585 usage(argv[0]);
586 return 2;
Doug Zongker76adfc52014-01-13 10:04:25 -0800587 }
Tao Bao3a2bb592016-02-25 12:38:53 -0800588
589 if ((fstab = read_fstab()) == nullptr) {
Tianjie Xu68fc81e2016-09-24 15:31:34 -0700590 log_uncrypt_error_code(kUncryptFstabReadError);
Tao Bao3a2bb592016-02-25 12:38:53 -0800591 return 1;
592 }
593
594 // c3. The socket is created by init when starting the service. uncrypt
595 // will use the socket to communicate with its caller.
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700596 android::base::unique_fd service_socket(android_get_control_socket(UNCRYPT_SOCKET.c_str()));
597 if (service_socket == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700598 PLOG(ERROR) << "failed to open socket \"" << UNCRYPT_SOCKET << "\"";
Tianjie Xu68fc81e2016-09-24 15:31:34 -0700599 log_uncrypt_error_code(kUncryptSocketOpenError);
Tao Bao3a2bb592016-02-25 12:38:53 -0800600 return 1;
601 }
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700602 fcntl(service_socket, F_SETFD, FD_CLOEXEC);
Tao Bao3a2bb592016-02-25 12:38:53 -0800603
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700604 if (listen(service_socket, 1) == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700605 PLOG(ERROR) << "failed to listen on socket " << service_socket.get();
Tianjie Xu68fc81e2016-09-24 15:31:34 -0700606 log_uncrypt_error_code(kUncryptSocketListenError);
Tao Bao3a2bb592016-02-25 12:38:53 -0800607 return 1;
608 }
609
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700610 android::base::unique_fd socket_fd(accept4(service_socket, nullptr, nullptr, SOCK_CLOEXEC));
611 if (socket_fd == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700612 PLOG(ERROR) << "failed to accept on socket " << service_socket.get();
Tianjie Xu68fc81e2016-09-24 15:31:34 -0700613 log_uncrypt_error_code(kUncryptSocketAcceptError);
Tao Bao3a2bb592016-02-25 12:38:53 -0800614 return 1;
615 }
616
617 bool success = false;
618 switch (action) {
619 case UNCRYPT:
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700620 success = uncrypt_wrapper(input_path, map_file, socket_fd);
Tao Bao3a2bb592016-02-25 12:38:53 -0800621 break;
622 case SETUP_BCB:
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700623 success = setup_bcb(socket_fd);
Tao Bao3a2bb592016-02-25 12:38:53 -0800624 break;
625 case CLEAR_BCB:
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700626 success = clear_bcb(socket_fd);
Tao Bao3a2bb592016-02-25 12:38:53 -0800627 break;
628 default: // Should never happen.
Tianjie Xuc21edd42016-08-05 18:00:04 -0700629 LOG(ERROR) << "Invalid uncrypt action code: " << action;
Tao Bao3a2bb592016-02-25 12:38:53 -0800630 return 1;
631 }
632
633 // c13. Read a 4-byte code from the client before uncrypt exits. This is to
634 // ensure the client to receive the last status code before the socket gets
635 // destroyed.
636 int code;
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700637 if (android::base::ReadFully(socket_fd, &code, 4)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700638 LOG(INFO) << " received " << code << ", exiting now";
Tao Bao3a2bb592016-02-25 12:38:53 -0800639 } else {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700640 PLOG(ERROR) << "failed to read the code";
Tao Bao3a2bb592016-02-25 12:38:53 -0800641 }
642 return success ? 0 : 1;
Doug Zongker76adfc52014-01-13 10:04:25 -0800643}