blob: 4ac516d2155930bcfa2455a5e6007e45207d6ae9 [file] [log] [blame]
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) {
Tianjie Xu7ceff3e2016-06-30 15:31:51 -0700213 // If socket equals -1, uncrypt is in debug mode without socket communication.
214 // Skip writing and return success.
215 if (socket == -1) {
216 return true;
217 }
Tao Bao3a2bb592016-02-25 12:38:53 -0800218 int status_out = htonl(status);
219 return android::base::WriteFully(socket, &status_out, sizeof(int));
220}
221
Tao Bao383b00d2015-05-21 16:44:44 -0700222// Parse uncrypt_file to find the update package name.
Yabin Cui2d46da52016-01-26 16:50:15 -0800223static bool find_uncrypt_package(const std::string& uncrypt_path_file, std::string* package_name) {
224 CHECK(package_name != nullptr);
225 std::string uncrypt_path;
226 if (!android::base::ReadFileToString(uncrypt_path_file, &uncrypt_path)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700227 PLOG(ERROR) << "failed to open \"" << uncrypt_path_file << "\"";
Tao Bao383b00d2015-05-21 16:44:44 -0700228 return false;
Maxim Siniavinee7b28882014-02-13 15:48:53 -0800229 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800230
Tao Bao383b00d2015-05-21 16:44:44 -0700231 // Remove the trailing '\n' if present.
Yabin Cui2d46da52016-01-26 16:50:15 -0800232 *package_name = android::base::Trim(uncrypt_path);
Tao Bao383b00d2015-05-21 16:44:44 -0700233 return true;
Doug Zongker76adfc52014-01-13 10:04:25 -0800234}
235
Tao Bao381f4552015-05-05 18:36:45 -0700236static int produce_block_map(const char* path, const char* map_file, const char* blk_dev,
Tao Bao3a2bb592016-02-25 12:38:53 -0800237 bool encrypted, int socket) {
Yabin Cui25dd0382016-02-01 11:40:37 -0800238 std::string err;
239 if (!android::base::RemoveFileIfExists(map_file, &err)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700240 LOG(ERROR) << "failed to remove the existing map file " << map_file << ": " << err;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700241 return kUncryptFileRemoveError;
Sungmin Choia72512c2014-12-10 21:57:09 +0900242 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800243 std::string tmp_map_file = std::string(map_file) + ".tmp";
Elliott Hughesbcabd092016-03-22 20:19:22 -0700244 android::base::unique_fd mapfd(open(tmp_map_file.c_str(),
245 O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR));
246 if (mapfd == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700247 PLOG(ERROR) << "failed to open " << tmp_map_file;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700248 return kUncryptFileOpenError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800249 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800250
Tao Bao3a2bb592016-02-25 12:38:53 -0800251 // Make sure we can write to the socket.
252 if (!write_status_to_socket(0, socket)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700253 LOG(ERROR) << "failed to write to socket " << socket;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700254 return kUncryptSocketWriteError;
Tao Bao383b00d2015-05-21 16:44:44 -0700255 }
256
Tao Bao381f4552015-05-05 18:36:45 -0700257 struct stat sb;
Tao Baoc7547922015-08-06 18:35:05 -0700258 if (stat(path, &sb) != 0) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700259 LOG(ERROR) << "failed to stat " << path;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700260 return kUncryptFileStatError;
Doug Zongker76adfc52014-01-13 10:04:25 -0800261 }
262
Tianjie Xuc21edd42016-08-05 18:00:04 -0700263 LOG(INFO) << " block size: " << sb.st_blksize << " bytes";
Doug Zongker76adfc52014-01-13 10:04:25 -0800264
265 int blocks = ((sb.st_size-1) / sb.st_blksize) + 1;
Tianjie Xuc21edd42016-08-05 18:00:04 -0700266 LOG(INFO) << " file size: " << sb.st_size << " bytes, " << blocks << " blocks";
Doug Zongker76adfc52014-01-13 10:04:25 -0800267
Yabin Cui25dd0382016-02-01 11:40:37 -0800268 std::vector<int> ranges;
Doug Zongker76adfc52014-01-13 10:04:25 -0800269
Chih-Hung Hsieh54a27472016-04-18 11:30:55 -0700270 std::string s = android::base::StringPrintf("%s\n%" PRId64 " %" PRId64 "\n",
271 blk_dev, static_cast<int64_t>(sb.st_size),
272 static_cast<int64_t>(sb.st_blksize));
Elliott Hughesbcabd092016-03-22 20:19:22 -0700273 if (!android::base::WriteStringToFd(s, mapfd)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700274 PLOG(ERROR) << "failed to write " << tmp_map_file;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700275 return kUncryptWriteError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800276 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800277
Yabin Cui25dd0382016-02-01 11:40:37 -0800278 std::vector<std::vector<unsigned char>> buffers;
Doug Zongker76adfc52014-01-13 10:04:25 -0800279 if (encrypted) {
Yabin Cui25dd0382016-02-01 11:40:37 -0800280 buffers.resize(WINDOW_SIZE, std::vector<unsigned char>(sb.st_blksize));
Doug Zongker76adfc52014-01-13 10:04:25 -0800281 }
282 int head_block = 0;
283 int head = 0, tail = 0;
Doug Zongker76adfc52014-01-13 10:04:25 -0800284
Elliott Hughesbcabd092016-03-22 20:19:22 -0700285 android::base::unique_fd fd(open(path, O_RDONLY));
286 if (fd == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700287 PLOG(ERROR) << "failed to open " << path << " for reading";
Tianjie Xuda44cf12016-09-24 15:31:34 -0700288 return kUncryptFileOpenError;
Doug Zongker76adfc52014-01-13 10:04:25 -0800289 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800290
Elliott Hughesbcabd092016-03-22 20:19:22 -0700291 android::base::unique_fd wfd;
Doug Zongker76adfc52014-01-13 10:04:25 -0800292 if (encrypted) {
Elliott Hughesbcabd092016-03-22 20:19:22 -0700293 wfd.reset(open(blk_dev, O_WRONLY));
294 if (wfd == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700295 PLOG(ERROR) << "failed to open " << blk_dev << " for writing";
Tianjie Xuda44cf12016-09-24 15:31:34 -0700296 return kUncryptBlockOpenError;
Doug Zongker76adfc52014-01-13 10:04:25 -0800297 }
298 }
299
Tao Baob8df5fb2015-12-08 22:47:25 -0800300 off64_t pos = 0;
Tao Bao383b00d2015-05-21 16:44:44 -0700301 int last_progress = 0;
Doug Zongker76adfc52014-01-13 10:04:25 -0800302 while (pos < sb.st_size) {
Tao Bao383b00d2015-05-21 16:44:44 -0700303 // Update the status file, progress must be between [0, 99].
304 int progress = static_cast<int>(100 * (double(pos) / double(sb.st_size)));
305 if (progress > last_progress) {
Tao Bao3a2bb592016-02-25 12:38:53 -0800306 last_progress = progress;
307 write_status_to_socket(progress, socket);
Tao Bao383b00d2015-05-21 16:44:44 -0700308 }
309
Doug Zongker76adfc52014-01-13 10:04:25 -0800310 if ((tail+1) % WINDOW_SIZE == head) {
311 // write out head buffer
312 int block = head_block;
Elliott Hughesbcabd092016-03-22 20:19:22 -0700313 if (ioctl(fd, FIBMAP, &block) != 0) {
Tianjie Xuda44cf12016-09-24 15:31:34 -0700314 PLOG(ERROR) << "failed to find block " << head_block;
315 return kUncryptIoctlError;
Doug Zongker76adfc52014-01-13 10:04:25 -0800316 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800317 add_block_to_ranges(ranges, block);
Doug Zongker76adfc52014-01-13 10:04:25 -0800318 if (encrypted) {
Elliott Hughesbcabd092016-03-22 20:19:22 -0700319 if (write_at_offset(buffers[head].data(), sb.st_blksize, wfd,
320 static_cast<off64_t>(sb.st_blksize) * block) != 0) {
Tianjie Xuda44cf12016-09-24 15:31:34 -0700321 return kUncryptWriteError;
Doug Zongker76adfc52014-01-13 10:04:25 -0800322 }
323 }
324 head = (head + 1) % WINDOW_SIZE;
325 ++head_block;
326 }
327
328 // read next block to tail
329 if (encrypted) {
Yabin Cui25dd0382016-02-01 11:40:37 -0800330 size_t to_read = static_cast<size_t>(
331 std::min(static_cast<off64_t>(sb.st_blksize), sb.st_size - pos));
Elliott Hughesbcabd092016-03-22 20:19:22 -0700332 if (!android::base::ReadFully(fd, buffers[tail].data(), to_read)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700333 PLOG(ERROR) << "failed to read " << path;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700334 return kUncryptReadError;
Doug Zongker76adfc52014-01-13 10:04:25 -0800335 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800336 pos += to_read;
Doug Zongker76adfc52014-01-13 10:04:25 -0800337 } else {
338 // If we're not encrypting; we don't need to actually read
339 // anything, just skip pos forward as if we'd read a
340 // block.
341 pos += sb.st_blksize;
342 }
343 tail = (tail+1) % WINDOW_SIZE;
344 }
345
346 while (head != tail) {
347 // write out head buffer
348 int block = head_block;
Elliott Hughesbcabd092016-03-22 20:19:22 -0700349 if (ioctl(fd, FIBMAP, &block) != 0) {
Tianjie Xuda44cf12016-09-24 15:31:34 -0700350 PLOG(ERROR) << "failed to find block " << head_block;
351 return kUncryptIoctlError;
Doug Zongker76adfc52014-01-13 10:04:25 -0800352 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800353 add_block_to_ranges(ranges, block);
Doug Zongker76adfc52014-01-13 10:04:25 -0800354 if (encrypted) {
Elliott Hughesbcabd092016-03-22 20:19:22 -0700355 if (write_at_offset(buffers[head].data(), sb.st_blksize, wfd,
356 static_cast<off64_t>(sb.st_blksize) * block) != 0) {
Tianjie Xuda44cf12016-09-24 15:31:34 -0700357 return kUncryptWriteError;
Doug Zongker76adfc52014-01-13 10:04:25 -0800358 }
359 }
360 head = (head + 1) % WINDOW_SIZE;
361 ++head_block;
362 }
363
Yabin Cui25dd0382016-02-01 11:40:37 -0800364 if (!android::base::WriteStringToFd(
Elliott Hughesbcabd092016-03-22 20:19:22 -0700365 android::base::StringPrintf("%zu\n", ranges.size() / 2), mapfd)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700366 PLOG(ERROR) << "failed to write " << tmp_map_file;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700367 return kUncryptWriteError;
Tao Baofb4ccef2015-05-04 10:10:13 -0700368 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800369 for (size_t i = 0; i < ranges.size(); i += 2) {
370 if (!android::base::WriteStringToFd(
Elliott Hughesbcabd092016-03-22 20:19:22 -0700371 android::base::StringPrintf("%d %d\n", ranges[i], ranges[i+1]), mapfd)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700372 PLOG(ERROR) << "failed to write " << tmp_map_file;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700373 return kUncryptWriteError;
Tao Baofb4ccef2015-05-04 10:10:13 -0700374 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800375 }
376
Elliott Hughesbcabd092016-03-22 20:19:22 -0700377 if (fsync(mapfd) == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700378 PLOG(ERROR) << "failed to fsync \"" << tmp_map_file << "\"";
Tianjie Xuda44cf12016-09-24 15:31:34 -0700379 return kUncryptFileSyncError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800380 }
Elliott Hughesbcabd092016-03-22 20:19:22 -0700381 if (close(mapfd.release()) == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700382 PLOG(ERROR) << "failed to close " << tmp_map_file;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700383 return kUncryptFileCloseError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800384 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800385
386 if (encrypted) {
Elliott Hughesbcabd092016-03-22 20:19:22 -0700387 if (fsync(wfd) == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700388 PLOG(ERROR) << "failed to fsync \"" << blk_dev << "\"";
Tianjie Xuda44cf12016-09-24 15:31:34 -0700389 return kUncryptFileSyncError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800390 }
Elliott Hughesbcabd092016-03-22 20:19:22 -0700391 if (close(wfd.release()) == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700392 PLOG(ERROR) << "failed to close " << blk_dev;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700393 return kUncryptFileCloseError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800394 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800395 }
396
397 if (rename(tmp_map_file.c_str(), map_file) == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700398 PLOG(ERROR) << "failed to rename " << tmp_map_file << " to " << map_file;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700399 return kUncryptFileRenameError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800400 }
401 // Sync dir to make rename() result written to disk.
402 std::string file_name = map_file;
403 std::string dir_name = dirname(&file_name[0]);
Elliott Hughesbcabd092016-03-22 20:19:22 -0700404 android::base::unique_fd dfd(open(dir_name.c_str(), O_RDONLY | O_DIRECTORY));
405 if (dfd == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700406 PLOG(ERROR) << "failed to open dir " << dir_name;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700407 return kUncryptFileOpenError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800408 }
Elliott Hughesbcabd092016-03-22 20:19:22 -0700409 if (fsync(dfd) == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700410 PLOG(ERROR) << "failed to fsync " << dir_name;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700411 return kUncryptFileSyncError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800412 }
Elliott Hughesbcabd092016-03-22 20:19:22 -0700413 if (close(dfd.release()) == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700414 PLOG(ERROR) << "failed to close " << dir_name;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700415 return kUncryptFileCloseError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800416 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800417 return 0;
418}
419
Tao Bao3a2bb592016-02-25 12:38:53 -0800420static int uncrypt(const char* input_path, const char* map_file, const int socket) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700421 LOG(INFO) << "update package is \"" << input_path << "\"";
Doug Zongkerf449db22014-08-26 09:15:08 -0700422
Doug Zongker76adfc52014-01-13 10:04:25 -0800423 // Turn the name of the file we're supposed to convert into an
424 // absolute path, so we can find what filesystem it's on.
425 char path[PATH_MAX+1];
426 if (realpath(input_path, path) == NULL) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700427 PLOG(ERROR) << "failed to convert \"" << input_path << "\" to absolute path";
Doug Zongker76adfc52014-01-13 10:04:25 -0800428 return 1;
429 }
430
Tao Bao381f4552015-05-05 18:36:45 -0700431 bool encryptable;
432 bool encrypted;
Doug Zongker76adfc52014-01-13 10:04:25 -0800433 const char* blk_dev = find_block_device(path, &encryptable, &encrypted);
434 if (blk_dev == NULL) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700435 LOG(ERROR) << "failed to find block device for " << path;
Doug Zongker76adfc52014-01-13 10:04:25 -0800436 return 1;
437 }
438
439 // If the filesystem it's on isn't encrypted, we only produce the
440 // block map, we don't rewrite the file contents (it would be
441 // pointless to do so).
Tianjie Xuc21edd42016-08-05 18:00:04 -0700442 LOG(INFO) << "encryptable: " << (encryptable ? "yes" : "no");
443 LOG(INFO) << " encrypted: " << (encrypted ? "yes" : "no");
Doug Zongker76adfc52014-01-13 10:04:25 -0800444
Doug Zongker574443d2014-09-05 08:22:12 -0700445 // Recovery supports installing packages from 3 paths: /cache,
446 // /data, and /sdcard. (On a particular device, other locations
447 // may work, but those are three we actually expect.)
448 //
449 // On /data we want to convert the file to a block map so that we
450 // can read the package without mounting the partition. On /cache
451 // and /sdcard we leave the file alone.
Tao Bao383b00d2015-05-21 16:44:44 -0700452 if (strncmp(path, "/data/", 6) == 0) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700453 LOG(INFO) << "writing block map " << map_file;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700454 return produce_block_map(path, map_file, blk_dev, encrypted, socket);
Tao Bao383b00d2015-05-21 16:44:44 -0700455 }
456
457 return 0;
458}
459
Tianjie Xu68fc81e2016-09-24 15:31:34 -0700460static void log_uncrypt_error_code(UncryptErrorCode error_code) {
Tianjie Xuda44cf12016-09-24 15:31:34 -0700461 if (!android::base::WriteStringToFile(android::base::StringPrintf(
Tianjie Xu68fc81e2016-09-24 15:31:34 -0700462 "uncrypt_error: %d\n", error_code), UNCRYPT_STATUS)) {
Tianjie Xuda44cf12016-09-24 15:31:34 -0700463 PLOG(WARNING) << "failed to write to " << UNCRYPT_STATUS;
464 }
Tianjie Xu68fc81e2016-09-24 15:31:34 -0700465}
466
467static bool uncrypt_wrapper(const char* input_path, const char* map_file, const int socket) {
468 // Initialize the uncrypt error to kUncryptErrorPlaceholder.
469 log_uncrypt_error_code(kUncryptErrorPlaceholder);
Tianjie Xuda44cf12016-09-24 15:31:34 -0700470
Yabin Cui2d46da52016-01-26 16:50:15 -0800471 std::string package;
472 if (input_path == nullptr) {
473 if (!find_uncrypt_package(UNCRYPT_PATH_FILE, &package)) {
Tao Bao3a2bb592016-02-25 12:38:53 -0800474 write_status_to_socket(-1, socket);
Tianjie Xuda44cf12016-09-24 15:31:34 -0700475 // Overwrite the error message.
Tianjie Xu68fc81e2016-09-24 15:31:34 -0700476 log_uncrypt_error_code(kUncryptPackageMissingError);
Tao Bao3a2bb592016-02-25 12:38:53 -0800477 return false;
Yabin Cui2d46da52016-01-26 16:50:15 -0800478 }
479 input_path = package.c_str();
480 }
481 CHECK(map_file != nullptr);
Tianjie Xue16e7992016-09-09 10:55:44 -0700482
Tianjie Xue16e7992016-09-09 10:55:44 -0700483 auto start = std::chrono::system_clock::now();
Tao Bao3a2bb592016-02-25 12:38:53 -0800484 int status = uncrypt(input_path, map_file, socket);
Tianjie Xuda44cf12016-09-24 15:31:34 -0700485 std::chrono::duration<double> duration = std::chrono::system_clock::now() - start;
486 int count = static_cast<int>(duration.count());
487
488 std::string uncrypt_message = android::base::StringPrintf("uncrypt_time: %d\n", count);
Yabin Cui2d46da52016-01-26 16:50:15 -0800489 if (status != 0) {
Tianjie Xuda44cf12016-09-24 15:31:34 -0700490 // Log the time cost and error code if uncrypt fails.
491 uncrypt_message += android::base::StringPrintf("uncrypt_error: %d\n", status);
492 if (!android::base::WriteStringToFile(uncrypt_message, UNCRYPT_STATUS)) {
493 PLOG(WARNING) << "failed to write to " << UNCRYPT_STATUS;
494 }
495
Tao Bao3a2bb592016-02-25 12:38:53 -0800496 write_status_to_socket(-1, socket);
497 return false;
Yabin Cui2d46da52016-01-26 16:50:15 -0800498 }
Tianjie Xue16e7992016-09-09 10:55:44 -0700499
Tianjie Xuda44cf12016-09-24 15:31:34 -0700500 if (!android::base::WriteStringToFile(uncrypt_message, UNCRYPT_STATUS)) {
Tianjie Xue16e7992016-09-09 10:55:44 -0700501 PLOG(WARNING) << "failed to write to " << UNCRYPT_STATUS;
502 }
503
Tao Bao3a2bb592016-02-25 12:38:53 -0800504 write_status_to_socket(100, socket);
Tianjie Xue16e7992016-09-09 10:55:44 -0700505
Tao Bao3a2bb592016-02-25 12:38:53 -0800506 return true;
Yabin Cui2d46da52016-01-26 16:50:15 -0800507}
508
Tao Bao3a2bb592016-02-25 12:38:53 -0800509static bool clear_bcb(const int socket) {
Yabin Cuia58a6db2016-04-06 15:52:18 -0700510 std::string err;
511 if (!clear_bootloader_message(&err)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700512 LOG(ERROR) << "failed to clear bootloader message: " << err;
Tao Bao3a2bb592016-02-25 12:38:53 -0800513 write_status_to_socket(-1, socket);
514 return false;
Yabin Cui2d46da52016-01-26 16:50:15 -0800515 }
Tao Bao3a2bb592016-02-25 12:38:53 -0800516 write_status_to_socket(100, socket);
517 return true;
Yabin Cui2d46da52016-01-26 16:50:15 -0800518}
519
Tao Bao3a2bb592016-02-25 12:38:53 -0800520static bool setup_bcb(const int socket) {
521 // c5. receive message length
522 int length;
523 if (!android::base::ReadFully(socket, &length, 4)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700524 PLOG(ERROR) << "failed to read the length";
Tao Bao3a2bb592016-02-25 12:38:53 -0800525 return false;
Yabin Cui2d46da52016-01-26 16:50:15 -0800526 }
Tao Bao3a2bb592016-02-25 12:38:53 -0800527 length = ntohl(length);
528
529 // c7. receive message
Yabin Cui2d46da52016-01-26 16:50:15 -0800530 std::string content;
Tao Bao3a2bb592016-02-25 12:38:53 -0800531 content.resize(length);
532 if (!android::base::ReadFully(socket, &content[0], length)) {
Tao Bao10334082016-12-12 17:10:20 -0800533 PLOG(ERROR) << "failed to read the message";
Tao Bao3a2bb592016-02-25 12:38:53 -0800534 return false;
Yabin Cui2d46da52016-01-26 16:50:15 -0800535 }
Tianjie Xuc21edd42016-08-05 18:00:04 -0700536 LOG(INFO) << " received command: [" << content << "] (" << content.size() << ")";
Yabin Cui6faf0262016-06-09 14:09:39 -0700537 std::vector<std::string> options = android::base::Split(content, "\n");
538 std::string wipe_package;
539 for (auto& option : options) {
540 if (android::base::StartsWith(option, "--wipe_package=")) {
541 std::string path = option.substr(strlen("--wipe_package="));
542 if (!android::base::ReadFileToString(path, &wipe_package)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700543 PLOG(ERROR) << "failed to read " << path;
Yabin Cui6faf0262016-06-09 14:09:39 -0700544 return false;
545 }
546 option = android::base::StringPrintf("--wipe_package_size=%zu", wipe_package.size());
547 }
548 }
Tao Bao3a2bb592016-02-25 12:38:53 -0800549
550 // c8. setup the bcb command
Yabin Cuia58a6db2016-04-06 15:52:18 -0700551 std::string err;
Yabin Cui6faf0262016-06-09 14:09:39 -0700552 if (!write_bootloader_message(options, &err)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700553 LOG(ERROR) << "failed to set bootloader message: " << err;
Tao Bao3a2bb592016-02-25 12:38:53 -0800554 write_status_to_socket(-1, socket);
555 return false;
Yabin Cui2d46da52016-01-26 16:50:15 -0800556 }
Yabin Cui6faf0262016-06-09 14:09:39 -0700557 if (!wipe_package.empty() && !write_wipe_package(wipe_package, &err)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700558 PLOG(ERROR) << "failed to set wipe package: " << err;
Yabin Cui6faf0262016-06-09 14:09:39 -0700559 write_status_to_socket(-1, socket);
560 return false;
561 }
Tao Bao3a2bb592016-02-25 12:38:53 -0800562 // c10. send "100" status
563 write_status_to_socket(100, socket);
564 return true;
Yabin Cui2d46da52016-01-26 16:50:15 -0800565}
566
Yabin Cui2d46da52016-01-26 16:50:15 -0800567static void usage(const char* exename) {
568 fprintf(stderr, "Usage of %s:\n", exename);
569 fprintf(stderr, "%s [<package_path> <map_file>] Uncrypt ota package.\n", exename);
Yabin Cui2d46da52016-01-26 16:50:15 -0800570 fprintf(stderr, "%s --clear-bcb Clear BCB data in misc partition.\n", exename);
571 fprintf(stderr, "%s --setup-bcb Setup BCB data by command file.\n", exename);
Yabin Cui2d46da52016-01-26 16:50:15 -0800572}
573
574int main(int argc, char** argv) {
Tianjie Xu7ceff3e2016-06-30 15:31:51 -0700575 enum { UNCRYPT, SETUP_BCB, CLEAR_BCB, UNCRYPT_DEBUG } action;
Tao Bao3a2bb592016-02-25 12:38:53 -0800576 const char* input_path = nullptr;
577 const char* map_file = CACHE_BLOCK_MAP.c_str();
578
579 if (argc == 2 && strcmp(argv[1], "--clear-bcb") == 0) {
580 action = CLEAR_BCB;
581 } else if (argc == 2 && strcmp(argv[1], "--setup-bcb") == 0) {
582 action = SETUP_BCB;
Tao Bao3a2bb592016-02-25 12:38:53 -0800583 } else if (argc == 1) {
584 action = UNCRYPT;
585 } else if (argc == 3) {
586 input_path = argv[1];
587 map_file = argv[2];
Tianjie Xu7ceff3e2016-06-30 15:31:51 -0700588 action = UNCRYPT_DEBUG;
Tao Bao3a2bb592016-02-25 12:38:53 -0800589 } else {
590 usage(argv[0]);
591 return 2;
Doug Zongker76adfc52014-01-13 10:04:25 -0800592 }
Tao Bao3a2bb592016-02-25 12:38:53 -0800593
594 if ((fstab = read_fstab()) == nullptr) {
Tianjie Xu68fc81e2016-09-24 15:31:34 -0700595 log_uncrypt_error_code(kUncryptFstabReadError);
Tao Bao3a2bb592016-02-25 12:38:53 -0800596 return 1;
597 }
598
Tianjie Xu7ceff3e2016-06-30 15:31:51 -0700599 if (action == UNCRYPT_DEBUG) {
600 LOG(INFO) << "uncrypt called in debug mode, skip socket communication\n";
601 bool success = uncrypt_wrapper(input_path, map_file, -1);
602 if (success) {
603 LOG(INFO) << "uncrypt succeeded\n";
604 } else{
605 LOG(INFO) << "uncrypt failed\n";
606 }
607 return success ? 0 : 1;
608 }
609
Tao Bao3a2bb592016-02-25 12:38:53 -0800610 // c3. The socket is created by init when starting the service. uncrypt
611 // will use the socket to communicate with its caller.
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700612 android::base::unique_fd service_socket(android_get_control_socket(UNCRYPT_SOCKET.c_str()));
613 if (service_socket == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700614 PLOG(ERROR) << "failed to open socket \"" << UNCRYPT_SOCKET << "\"";
Tianjie Xu68fc81e2016-09-24 15:31:34 -0700615 log_uncrypt_error_code(kUncryptSocketOpenError);
Tao Bao3a2bb592016-02-25 12:38:53 -0800616 return 1;
617 }
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700618 fcntl(service_socket, F_SETFD, FD_CLOEXEC);
Tao Bao3a2bb592016-02-25 12:38:53 -0800619
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700620 if (listen(service_socket, 1) == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700621 PLOG(ERROR) << "failed to listen on socket " << service_socket.get();
Tianjie Xu68fc81e2016-09-24 15:31:34 -0700622 log_uncrypt_error_code(kUncryptSocketListenError);
Tao Bao3a2bb592016-02-25 12:38:53 -0800623 return 1;
624 }
625
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700626 android::base::unique_fd socket_fd(accept4(service_socket, nullptr, nullptr, SOCK_CLOEXEC));
627 if (socket_fd == -1) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700628 PLOG(ERROR) << "failed to accept on socket " << service_socket.get();
Tianjie Xu68fc81e2016-09-24 15:31:34 -0700629 log_uncrypt_error_code(kUncryptSocketAcceptError);
Tao Bao3a2bb592016-02-25 12:38:53 -0800630 return 1;
631 }
632
633 bool success = false;
634 switch (action) {
635 case UNCRYPT:
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700636 success = uncrypt_wrapper(input_path, map_file, socket_fd);
Tao Bao3a2bb592016-02-25 12:38:53 -0800637 break;
638 case SETUP_BCB:
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700639 success = setup_bcb(socket_fd);
Tao Bao3a2bb592016-02-25 12:38:53 -0800640 break;
641 case CLEAR_BCB:
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700642 success = clear_bcb(socket_fd);
Tao Bao3a2bb592016-02-25 12:38:53 -0800643 break;
644 default: // Should never happen.
Tianjie Xuc21edd42016-08-05 18:00:04 -0700645 LOG(ERROR) << "Invalid uncrypt action code: " << action;
Tao Bao3a2bb592016-02-25 12:38:53 -0800646 return 1;
647 }
648
649 // c13. Read a 4-byte code from the client before uncrypt exits. This is to
650 // ensure the client to receive the last status code before the socket gets
651 // destroyed.
652 int code;
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700653 if (android::base::ReadFully(socket_fd, &code, 4)) {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700654 LOG(INFO) << " received " << code << ", exiting now";
Tao Bao3a2bb592016-02-25 12:38:53 -0800655 } else {
Tianjie Xuc21edd42016-08-05 18:00:04 -0700656 PLOG(ERROR) << "failed to read the code";
Tao Bao3a2bb592016-02-25 12:38:53 -0800657 }
658 return success ? 0 : 1;
Doug Zongker76adfc52014-01-13 10:04:25 -0800659}