blob: e1950422b4fed12ceff7804e87ab2588b1e30747 [file] [log] [blame]
Jeff Sharkeyd2c96e72015-11-08 17:56:23 -08001/*
2 * Copyright (C) 2015 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
Paul Lawrence731a7a22015-04-28 22:14:15 +000017#include "Ext4Crypt.h"
18
Paul Crowley1ef25582016-01-21 20:26:12 +000019#include "KeyStorage.h"
Jeff Sharkeyd2c96e72015-11-08 17:56:23 -080020#include "Utils.h"
21
Paul Crowleya3630362016-05-17 14:17:56 -070022#include <algorithm>
Paul Lawrencefd7db732015-04-10 07:48:51 -070023#include <iomanip>
Paul Lawrence731a7a22015-04-28 22:14:15 +000024#include <map>
Paul Crowleyb1f3d242016-01-28 10:09:46 +000025#include <set>
Paul Lawrencefd7db732015-04-10 07:48:51 -070026#include <sstream>
Paul Crowleydf528a72016-03-09 09:31:37 -080027#include <string>
Paul Lawrence731a7a22015-04-28 22:14:15 +000028
Paul Crowleydf528a72016-03-09 09:31:37 -080029#include <dirent.h>
30#include <errno.h>
31#include <fcntl.h>
Paul Crowleya3630362016-05-17 14:17:56 -070032#include <limits.h>
Paul Lawrencefd7db732015-04-10 07:48:51 -070033#include <openssl/sha.h>
Jeff Sharkey7a9dd952016-01-12 16:52:16 -070034#include <selinux/android.h>
Paul Crowleydf528a72016-03-09 09:31:37 -080035#include <stdio.h>
36#include <sys/mount.h>
37#include <sys/stat.h>
38#include <sys/types.h>
Paul Lawrence731a7a22015-04-28 22:14:15 +000039
Paul Crowley480fcd22015-08-24 14:53:28 +010040#include <private/android_filesystem_config.h>
41
Paul Lawrence731a7a22015-04-28 22:14:15 +000042#include "cryptfs.h"
43
Jeff Sharkey7a9dd952016-01-12 16:52:16 -070044#define EMULATED_USES_SELINUX 0
Jeff Sharkeybe70c9a2016-04-14 20:45:16 -060045#define MANAGE_MISC_DIRS 0
Jeff Sharkey7a9dd952016-01-12 16:52:16 -070046
Jeff Sharkeyd2c96e72015-11-08 17:56:23 -080047#include <cutils/fs.h>
Tao Bao989fec22016-10-05 18:01:19 -070048#include <ext4_utils/ext4_crypt.h>
49#include <ext4_utils/key_control.h>
Jeff Sharkeyd2c96e72015-11-08 17:56:23 -080050
Elliott Hughes7e128fb2015-12-04 15:50:53 -080051#include <android-base/file.h>
Elliott Hughes6bf05472015-12-04 17:55:33 -080052#include <android-base/logging.h>
Elliott Hughes7e128fb2015-12-04 15:50:53 -080053#include <android-base/stringprintf.h>
Paul Lawrence731a7a22015-04-28 22:14:15 +000054
Jeff Sharkeyd2c96e72015-11-08 17:56:23 -080055using android::base::StringPrintf;
Paul Crowley05720802016-02-08 15:55:41 +000056using android::vold::kEmptyAuthentication;
Jeff Sharkeyd2c96e72015-11-08 17:56:23 -080057
Jeff Sharkey47695b22016-02-01 17:02:29 -070058// NOTE: keep in sync with StorageManager
59static constexpr int FLAG_STORAGE_DE = 1 << 0;
60static constexpr int FLAG_STORAGE_CE = 1 << 1;
61
Paul Lawrence731a7a22015-04-28 22:14:15 +000062namespace {
Paul Crowley4d2d5242016-04-27 10:25:12 -070063const std::string device_key_dir = std::string() + DATA_MNT_POINT + e4crypt_unencrypted_folder;
Paul Crowleydf528a72016-03-09 09:31:37 -080064const std::string device_key_path = device_key_dir + "/key";
65const std::string device_key_temp = device_key_dir + "/temp";
Paul Lawrence5a06a642016-02-03 13:39:13 -080066
Paul Crowleydf528a72016-03-09 09:31:37 -080067const std::string user_key_dir = std::string() + DATA_MNT_POINT + "/misc/vold/user_keys";
68const std::string user_key_temp = user_key_dir + "/temp";
Paul Crowley285956f2016-01-20 13:12:38 +000069
Paul Crowleydf528a72016-03-09 09:31:37 -080070bool s_global_de_initialized = false;
Paul Lawrence7b6b5652016-02-02 11:14:59 -080071
Paul Crowleydf528a72016-03-09 09:31:37 -080072// Some users are ephemeral, don't try to wipe their keys from disk
73std::set<userid_t> s_ephemeral_users;
Paul Lawrenceaec34df2016-02-03 10:52:41 -080074
Paul Crowleydf528a72016-03-09 09:31:37 -080075// Map user ids to key references
76std::map<userid_t, std::string> s_de_key_raw_refs;
77std::map<userid_t, std::string> s_ce_key_raw_refs;
78// TODO abolish this map. Keys should not be long-lived in user memory, only kernel memory.
79// See b/26948053
80std::map<userid_t, std::string> s_ce_keys;
Paul Lawrence731a7a22015-04-28 22:14:15 +000081
Paul Crowleydf528a72016-03-09 09:31:37 -080082// ext4enc:TODO get this const from somewhere good
83const int EXT4_KEY_DESCRIPTOR_SIZE = 8;
Paul Lawrencefd7db732015-04-10 07:48:51 -070084
Paul Crowleydf528a72016-03-09 09:31:37 -080085// ext4enc:TODO Include structure from somewhere sensible
86// MUST be in sync with ext4_crypto.c in kernel
87constexpr int EXT4_ENCRYPTION_MODE_AES_256_XTS = 1;
88constexpr int EXT4_AES_256_XTS_KEY_SIZE = 64;
89constexpr int EXT4_MAX_KEY_SIZE = 64;
90struct ext4_encryption_key {
91 uint32_t mode;
92 char raw[EXT4_MAX_KEY_SIZE];
93 uint32_t size;
94};
Paul Lawrence731a7a22015-04-28 22:14:15 +000095}
96
Paul Crowley38132a12016-02-09 09:50:32 +000097static bool e4crypt_is_emulated() {
98 return property_get_bool("persist.sys.emulate_fbe", false);
99}
100
101static const char* escape_null(const char* value) {
102 return (value == nullptr) ? "null" : value;
Paul Lawrence731a7a22015-04-28 22:14:15 +0000103}
104
Paul Crowley93363482015-07-07 15:17:22 +0100105// Get raw keyref - used to make keyname and to pass to ioctl
Paul Crowleydf528a72016-03-09 09:31:37 -0800106static std::string generate_key_ref(const char* key, int length) {
Paul Lawrencefd7db732015-04-10 07:48:51 -0700107 SHA512_CTX c;
108
109 SHA512_Init(&c);
110 SHA512_Update(&c, key, length);
Paul Crowley285956f2016-01-20 13:12:38 +0000111 unsigned char key_ref1[SHA512_DIGEST_LENGTH];
Paul Lawrencefd7db732015-04-10 07:48:51 -0700112 SHA512_Final(key_ref1, &c);
113
114 SHA512_Init(&c);
Paul Crowley285956f2016-01-20 13:12:38 +0000115 SHA512_Update(&c, key_ref1, SHA512_DIGEST_LENGTH);
116 unsigned char key_ref2[SHA512_DIGEST_LENGTH];
Paul Lawrencefd7db732015-04-10 07:48:51 -0700117 SHA512_Final(key_ref2, &c);
118
Paul Crowleyd9b92952016-03-04 13:45:00 -0800119 static_assert(EXT4_KEY_DESCRIPTOR_SIZE <= SHA512_DIGEST_LENGTH,
Paul Crowleydf528a72016-03-09 09:31:37 -0800120 "Hash too short for descriptor");
Paul Lawrencefd7db732015-04-10 07:48:51 -0700121 return std::string((char*)key_ref2, EXT4_KEY_DESCRIPTOR_SIZE);
122}
123
Paul Crowleydf528a72016-03-09 09:31:37 -0800124static bool fill_key(const std::string& key, ext4_encryption_key* ext4_key) {
Paul Crowley21990692016-03-02 09:15:07 -0800125 if (key.size() != EXT4_AES_256_XTS_KEY_SIZE) {
126 LOG(ERROR) << "Wrong size key " << key.size();
127 return false;
128 }
Paul Crowleydf528a72016-03-09 09:31:37 -0800129 static_assert(EXT4_AES_256_XTS_KEY_SIZE <= sizeof(ext4_key->raw), "Key too long!");
Paul Crowleya051eb72016-03-08 16:08:32 -0800130 ext4_key->mode = EXT4_ENCRYPTION_MODE_AES_256_XTS;
131 ext4_key->size = key.size();
132 memset(ext4_key->raw, 0, sizeof(ext4_key->raw));
133 memcpy(ext4_key->raw, key.data(), key.size());
Paul Crowley21990692016-03-02 09:15:07 -0800134 return true;
Paul Crowley93363482015-07-07 15:17:22 +0100135}
Paul Lawrence731a7a22015-04-28 22:14:15 +0000136
Paul Crowleydf528a72016-03-09 09:31:37 -0800137static std::string keyname(const std::string& raw_ref) {
Paul Lawrencefd7db732015-04-10 07:48:51 -0700138 std::ostringstream o;
Paul Crowley93363482015-07-07 15:17:22 +0100139 o << "ext4:";
Paul Crowleydf528a72016-03-09 09:31:37 -0800140 for (auto i : raw_ref) {
Paul Crowleyd9b92952016-03-04 13:45:00 -0800141 o << std::hex << std::setw(2) << std::setfill('0') << (int)i;
Paul Lawrencefd7db732015-04-10 07:48:51 -0700142 }
Paul Crowley93363482015-07-07 15:17:22 +0100143 return o.str();
144}
Paul Lawrencefd7db732015-04-10 07:48:51 -0700145
Paul Crowley93363482015-07-07 15:17:22 +0100146// Get the keyring we store all keys in
Paul Crowleydf528a72016-03-09 09:31:37 -0800147static bool e4crypt_keyring(key_serial_t* device_keyring) {
Paul Crowleya051eb72016-03-08 16:08:32 -0800148 *device_keyring = keyctl_search(KEY_SPEC_SESSION_KEYRING, "keyring", "e4crypt", 0);
149 if (*device_keyring == -1) {
Paul Crowleyd9b92952016-03-04 13:45:00 -0800150 PLOG(ERROR) << "Unable to find device keyring";
151 return false;
152 }
153 return true;
Paul Crowley93363482015-07-07 15:17:22 +0100154}
Paul Lawrence731a7a22015-04-28 22:14:15 +0000155
Paul Crowleyb1f3d242016-01-28 10:09:46 +0000156// Install password into global keyring
157// Return raw key reference for use in policy
Paul Crowleydf528a72016-03-09 09:31:37 -0800158static bool install_key(const std::string& key, std::string* raw_ref) {
Paul Crowley21990692016-03-02 09:15:07 -0800159 ext4_encryption_key ext4_key;
Paul Crowleya051eb72016-03-08 16:08:32 -0800160 if (!fill_key(key, &ext4_key)) return false;
161 *raw_ref = generate_key_ref(ext4_key.raw, ext4_key.size);
162 auto ref = keyname(*raw_ref);
Paul Crowleyd9b92952016-03-04 13:45:00 -0800163 key_serial_t device_keyring;
Paul Crowleya051eb72016-03-08 16:08:32 -0800164 if (!e4crypt_keyring(&device_keyring)) return false;
Paul Crowleydf528a72016-03-09 09:31:37 -0800165 key_serial_t key_id =
166 add_key("logon", ref.c_str(), (void*)&ext4_key, sizeof(ext4_key), device_keyring);
Paul Lawrence731a7a22015-04-28 22:14:15 +0000167 if (key_id == -1) {
Paul Crowley285956f2016-01-20 13:12:38 +0000168 PLOG(ERROR) << "Failed to insert key into keyring " << device_keyring;
Paul Crowleyb1f3d242016-01-28 10:09:46 +0000169 return false;
Paul Lawrence731a7a22015-04-28 22:14:15 +0000170 }
Paul Crowleydf528a72016-03-09 09:31:37 -0800171 LOG(DEBUG) << "Added key " << key_id << " (" << ref << ") to keyring " << device_keyring
172 << " in process " << getpid();
Paul Crowleyb1f3d242016-01-28 10:09:46 +0000173 return true;
Paul Lawrence731a7a22015-04-28 22:14:15 +0000174}
175
Paul Crowleyb92f83c2016-02-01 14:10:43 +0000176static std::string get_de_key_path(userid_t user_id) {
177 return StringPrintf("%s/de/%d", user_key_dir.c_str(), user_id);
178}
179
Paul Crowleya3630362016-05-17 14:17:56 -0700180static std::string get_ce_key_directory_path(userid_t user_id) {
181 return StringPrintf("%s/ce/%d", user_key_dir.c_str(), user_id);
182}
183
184// Returns the keys newest first
185static std::vector<std::string> get_ce_key_paths(const std::string& directory_path) {
186 auto dirp = std::unique_ptr<DIR, int (*)(DIR*)>(opendir(directory_path.c_str()), closedir);
187 if (!dirp) {
188 PLOG(ERROR) << "Unable to open ce key directory: " + directory_path;
189 return std::vector<std::string>();
190 }
191 std::vector<std::string> result;
192 for (;;) {
193 errno = 0;
194 auto const entry = readdir(dirp.get());
195 if (!entry) {
196 if (errno) {
197 PLOG(ERROR) << "Unable to read ce key directory: " + directory_path;
198 return std::vector<std::string>();
199 }
200 break;
201 }
202 if (entry->d_type != DT_DIR || entry->d_name[0] != 'c') {
203 LOG(DEBUG) << "Skipping non-key " << entry->d_name;
204 continue;
205 }
206 result.emplace_back(directory_path + "/" + entry->d_name);
207 }
208 std::sort(result.begin(), result.end());
209 std::reverse(result.begin(), result.end());
210 return result;
211}
212
213static std::string get_ce_key_current_path(const std::string& directory_path) {
214 return directory_path + "/current";
215}
216
217static bool get_ce_key_new_path(const std::string& directory_path,
218 const std::vector<std::string>& paths,
219 std::string *ce_key_path) {
220 if (paths.empty()) {
221 *ce_key_path = get_ce_key_current_path(directory_path);
222 return true;
223 }
224 for (unsigned int i = 0; i < UINT_MAX; i++) {
225 auto const candidate = StringPrintf("%s/cx%010u", directory_path.c_str(), i);
226 if (paths[0] < candidate) {
227 *ce_key_path = candidate;
228 return true;
229 }
230 }
231 return false;
232}
233
234// Discard all keys but the named one; rename it to canonical name.
235// No point in acting on errors in this; ignore them.
236static void fixate_user_ce_key(const std::string& directory_path, const std::string &to_fix,
237 const std::vector<std::string>& paths) {
238 for (auto const other_path: paths) {
239 if (other_path != to_fix) {
240 android::vold::destroyKey(other_path);
241 }
242 }
243 auto const current_path = get_ce_key_current_path(directory_path);
244 if (to_fix != current_path) {
245 LOG(DEBUG) << "Renaming " << to_fix << " to " << current_path;
246 if (rename(to_fix.c_str(), current_path.c_str()) != 0) {
247 PLOG(WARNING) << "Unable to rename " << to_fix << " to " << current_path;
248 }
249 }
250}
251
252static bool read_and_fixate_user_ce_key(userid_t user_id,
253 const android::vold::KeyAuthentication& auth,
254 std::string *ce_key) {
255 auto const directory_path = get_ce_key_directory_path(user_id);
256 auto const paths = get_ce_key_paths(directory_path);
257 for (auto const ce_key_path: paths) {
258 LOG(DEBUG) << "Trying user CE key " << ce_key_path;
259 if (android::vold::retrieveKey(ce_key_path, auth, ce_key)) {
260 LOG(DEBUG) << "Successfully retrieved key";
261 fixate_user_ce_key(directory_path, ce_key_path, paths);
262 return true;
263 }
264 }
265 LOG(ERROR) << "Failed to find working ce key for user " << user_id;
266 return false;
Paul Crowleyb33e8872015-05-19 12:34:09 +0100267}
268
Paul Crowleydf528a72016-03-09 09:31:37 -0800269static bool read_and_install_user_ce_key(userid_t user_id,
270 const android::vold::KeyAuthentication& auth) {
Paul Crowleyb1f3d242016-01-28 10:09:46 +0000271 if (s_ce_key_raw_refs.count(user_id) != 0) return true;
Paul Crowley05720802016-02-08 15:55:41 +0000272 std::string ce_key;
Paul Crowleya3630362016-05-17 14:17:56 -0700273 if (!read_and_fixate_user_ce_key(user_id, auth, &ce_key)) return false;
Paul Crowley05720802016-02-08 15:55:41 +0000274 std::string ce_raw_ref;
Paul Crowleya051eb72016-03-08 16:08:32 -0800275 if (!install_key(ce_key, &ce_raw_ref)) return false;
Paul Crowley05720802016-02-08 15:55:41 +0000276 s_ce_keys[user_id] = ce_key;
277 s_ce_key_raw_refs[user_id] = ce_raw_ref;
Paul Crowleyb1f3d242016-01-28 10:09:46 +0000278 LOG(DEBUG) << "Installed ce key for user " << user_id;
Paul Crowley1ef25582016-01-21 20:26:12 +0000279 return true;
Paul Crowley285956f2016-01-20 13:12:38 +0000280}
281
Paul Crowleydf528a72016-03-09 09:31:37 -0800282static bool prepare_dir(const std::string& dir, mode_t mode, uid_t uid, gid_t gid) {
Paul Crowleyb1f3d242016-01-28 10:09:46 +0000283 LOG(DEBUG) << "Preparing: " << dir;
Paul Crowley13ffd8e2016-01-27 14:30:22 +0000284 if (fs_prepare_dir(dir.c_str(), mode, uid, gid) != 0) {
285 PLOG(ERROR) << "Failed to prepare " << dir;
Paul Crowley285956f2016-01-20 13:12:38 +0000286 return false;
287 }
Paul Crowley13ffd8e2016-01-27 14:30:22 +0000288 return true;
289}
290
Jeff Sharkeybe70c9a2016-04-14 20:45:16 -0600291static bool destroy_dir(const std::string& dir) {
292 LOG(DEBUG) << "Destroying: " << dir;
293 if (rmdir(dir.c_str()) != 0 && errno != ENOENT) {
294 PLOG(ERROR) << "Failed to destroy " << dir;
295 return false;
296 }
297 return true;
298}
299
Paul Crowleydf528a72016-03-09 09:31:37 -0800300static bool random_key(std::string* key) {
Paul Crowleya051eb72016-03-08 16:08:32 -0800301 if (android::vold::ReadRandomBytes(EXT4_AES_256_XTS_KEY_SIZE, *key) != 0) {
Paul Crowley1ef25582016-01-21 20:26:12 +0000302 // TODO status_t plays badly with PLOG, fix it.
303 LOG(ERROR) << "Random read failed";
Paul Crowley285956f2016-01-20 13:12:38 +0000304 return false;
305 }
Paul Crowleyb1f3d242016-01-28 10:09:46 +0000306 return true;
307}
308
Paul Crowleydf528a72016-03-09 09:31:37 -0800309static bool path_exists(const std::string& path) {
Paul Crowleyb1f3d242016-01-28 10:09:46 +0000310 return access(path.c_str(), F_OK) == 0;
311}
312
313// NB this assumes that there is only one thread listening for crypt commands, because
314// it creates keys in a fixed location.
Paul Crowleydf528a72016-03-09 09:31:37 -0800315static bool store_key(const std::string& key_path, const std::string& tmp_path,
316 const android::vold::KeyAuthentication& auth, const std::string& key) {
Paul Crowleyb1f3d242016-01-28 10:09:46 +0000317 if (path_exists(key_path)) {
318 LOG(ERROR) << "Already exists, cannot create key at: " << key_path;
319 return false;
320 }
Paul Crowley38132a12016-02-09 09:50:32 +0000321 if (path_exists(tmp_path)) {
Paul Crowleydf528a72016-03-09 09:31:37 -0800322 android::vold::destroyKey(tmp_path); // May be partially created so ignore errors
Paul Crowleyb1f3d242016-01-28 10:09:46 +0000323 }
Paul Crowley38132a12016-02-09 09:50:32 +0000324 if (!android::vold::storeKey(tmp_path, auth, key)) return false;
325 if (rename(tmp_path.c_str(), key_path.c_str()) != 0) {
Paul Crowleyb1f3d242016-01-28 10:09:46 +0000326 PLOG(ERROR) << "Unable to move new key to location: " << key_path;
327 return false;
Paul Crowley95376d62015-05-06 15:04:43 +0100328 }
Paul Crowley285956f2016-01-20 13:12:38 +0000329 LOG(DEBUG) << "Created key " << key_path;
Paul Crowley95376d62015-05-06 15:04:43 +0100330 return true;
331}
332
Paul Crowleyb92f83c2016-02-01 14:10:43 +0000333static bool create_and_install_user_keys(userid_t user_id, bool create_ephemeral) {
334 std::string de_key, ce_key;
Paul Crowleya051eb72016-03-08 16:08:32 -0800335 if (!random_key(&de_key)) return false;
336 if (!random_key(&ce_key)) return false;
Paul Crowleyb1f3d242016-01-28 10:09:46 +0000337 if (create_ephemeral) {
338 // If the key should be created as ephemeral, don't store it.
339 s_ephemeral_users.insert(user_id);
340 } else {
Paul Crowleya3630362016-05-17 14:17:56 -0700341 auto const directory_path = get_ce_key_directory_path(user_id);
342 if (!prepare_dir(directory_path, 0700, AID_ROOT, AID_ROOT)) return false;
343 auto const paths = get_ce_key_paths(directory_path);
344 std::string ce_key_path;
345 if (!get_ce_key_new_path(directory_path, paths, &ce_key_path)) return false;
346 if (!store_key(ce_key_path, user_key_temp,
347 kEmptyAuthentication, ce_key)) return false;
348 fixate_user_ce_key(directory_path, ce_key_path, paths);
349 // Write DE key second; once this is written, all is good.
Paul Crowley38132a12016-02-09 09:50:32 +0000350 if (!store_key(get_de_key_path(user_id), user_key_temp,
351 kEmptyAuthentication, de_key)) return false;
Paul Crowley95376d62015-05-06 15:04:43 +0100352 }
Paul Crowleyb92f83c2016-02-01 14:10:43 +0000353 std::string de_raw_ref;
Paul Crowleya051eb72016-03-08 16:08:32 -0800354 if (!install_key(de_key, &de_raw_ref)) return false;
Paul Crowleyb92f83c2016-02-01 14:10:43 +0000355 s_de_key_raw_refs[user_id] = de_raw_ref;
Paul Crowleyb1f3d242016-01-28 10:09:46 +0000356 std::string ce_raw_ref;
Paul Crowleya051eb72016-03-08 16:08:32 -0800357 if (!install_key(ce_key, &ce_raw_ref)) return false;
Paul Crowley05720802016-02-08 15:55:41 +0000358 s_ce_keys[user_id] = ce_key;
Paul Crowleyb1f3d242016-01-28 10:09:46 +0000359 s_ce_key_raw_refs[user_id] = ce_raw_ref;
Paul Crowleyb92f83c2016-02-01 14:10:43 +0000360 LOG(DEBUG) << "Created keys for user " << user_id;
Paul Crowleyb1f3d242016-01-28 10:09:46 +0000361 return true;
362}
363
Paul Crowleydf528a72016-03-09 09:31:37 -0800364static bool lookup_key_ref(const std::map<userid_t, std::string>& key_map, userid_t user_id,
365 std::string* raw_ref) {
Paul Crowleyb1f3d242016-01-28 10:09:46 +0000366 auto refi = key_map.find(user_id);
367 if (refi == key_map.end()) {
368 LOG(ERROR) << "Cannot find key for " << user_id;
369 return false;
370 }
Paul Crowleya051eb72016-03-08 16:08:32 -0800371 *raw_ref = refi->second;
Paul Crowleyb1f3d242016-01-28 10:09:46 +0000372 return true;
373}
374
Paul Crowleydf528a72016-03-09 09:31:37 -0800375static bool ensure_policy(const std::string& raw_ref, const std::string& path) {
Jeff Sharkey47695b22016-02-01 17:02:29 -0700376 if (e4crypt_policy_ensure(path.c_str(), raw_ref.data(), raw_ref.size()) != 0) {
Paul Crowleyb1f3d242016-01-28 10:09:46 +0000377 LOG(ERROR) << "Failed to set policy on: " << path;
378 return false;
379 }
380 return true;
Paul Crowley95376d62015-05-06 15:04:43 +0100381}
Paul Crowleyb33e8872015-05-19 12:34:09 +0100382
Paul Crowleydf528a72016-03-09 09:31:37 -0800383static bool is_numeric(const char* name) {
384 for (const char* p = name; *p != '\0'; p++) {
385 if (!isdigit(*p)) return false;
Paul Crowleyb92f83c2016-02-01 14:10:43 +0000386 }
387 return true;
388}
389
390static bool load_all_de_keys() {
391 auto de_dir = user_key_dir + "/de";
Paul Crowleydf528a72016-03-09 09:31:37 -0800392 auto dirp = std::unique_ptr<DIR, int (*)(DIR*)>(opendir(de_dir.c_str()), closedir);
Paul Crowleyb92f83c2016-02-01 14:10:43 +0000393 if (!dirp) {
394 PLOG(ERROR) << "Unable to read de key directory";
395 return false;
396 }
397 for (;;) {
398 errno = 0;
399 auto entry = readdir(dirp.get());
400 if (!entry) {
401 if (errno) {
402 PLOG(ERROR) << "Unable to read de key directory";
403 return false;
404 }
405 break;
406 }
407 if (entry->d_type != DT_DIR || !is_numeric(entry->d_name)) {
408 LOG(DEBUG) << "Skipping non-de-key " << entry->d_name;
409 continue;
410 }
411 userid_t user_id = atoi(entry->d_name);
412 if (s_de_key_raw_refs.count(user_id) == 0) {
Paul Crowley05720802016-02-08 15:55:41 +0000413 auto key_path = de_dir + "/" + entry->d_name;
414 std::string key;
Paul Crowleya051eb72016-03-08 16:08:32 -0800415 if (!android::vold::retrieveKey(key_path, kEmptyAuthentication, &key)) return false;
Paul Crowleyb92f83c2016-02-01 14:10:43 +0000416 std::string raw_ref;
Paul Crowleya051eb72016-03-08 16:08:32 -0800417 if (!install_key(key, &raw_ref)) return false;
Paul Crowleyb92f83c2016-02-01 14:10:43 +0000418 s_de_key_raw_refs[user_id] = raw_ref;
419 LOG(DEBUG) << "Installed de key for user " << user_id;
420 }
421 }
422 // ext4enc:TODO: go through all DE directories, ensure that all user dirs have the
423 // correct policy set on them, and that no rogue ones exist.
424 return true;
425}
426
Paul Crowleydf528a72016-03-09 09:31:37 -0800427bool e4crypt_initialize_global_de() {
Paul Crowley38132a12016-02-09 09:50:32 +0000428 LOG(INFO) << "e4crypt_initialize_global_de";
Paul Lawrenceaec34df2016-02-03 10:52:41 -0800429
Paul Crowley38132a12016-02-09 09:50:32 +0000430 if (s_global_de_initialized) {
431 LOG(INFO) << "Already initialized";
Paul Crowley76107cb2016-02-09 10:04:39 +0000432 return true;
Paul Lawrenceaec34df2016-02-03 10:52:41 -0800433 }
434
435 std::string device_key;
Paul Crowley38132a12016-02-09 09:50:32 +0000436 if (path_exists(device_key_path)) {
437 if (!android::vold::retrieveKey(device_key_path,
Paul Crowleya051eb72016-03-08 16:08:32 -0800438 kEmptyAuthentication, &device_key)) return false;
Paul Crowley38132a12016-02-09 09:50:32 +0000439 } else {
Paul Lawrenceaec34df2016-02-03 10:52:41 -0800440 LOG(INFO) << "Creating new key";
Paul Crowleya051eb72016-03-08 16:08:32 -0800441 if (!random_key(&device_key)) return false;
Paul Crowley38132a12016-02-09 09:50:32 +0000442 if (!store_key(device_key_path, device_key_temp,
Paul Crowley76107cb2016-02-09 10:04:39 +0000443 kEmptyAuthentication, device_key)) return false;
Paul Lawrenceaec34df2016-02-03 10:52:41 -0800444 }
445
446 std::string device_key_ref;
Paul Crowleya051eb72016-03-08 16:08:32 -0800447 if (!install_key(device_key, &device_key_ref)) {
Paul Lawrenceaec34df2016-02-03 10:52:41 -0800448 LOG(ERROR) << "Failed to install device key";
Paul Crowley76107cb2016-02-09 10:04:39 +0000449 return false;
Paul Lawrenceaec34df2016-02-03 10:52:41 -0800450 }
451
Paul Lawrencef10544d2016-02-04 08:18:52 -0800452 std::string ref_filename = std::string("/data") + e4crypt_key_ref;
453 if (!android::base::WriteStringToFile(device_key_ref, ref_filename)) {
454 PLOG(ERROR) << "Cannot save key reference";
Paul Crowley76107cb2016-02-09 10:04:39 +0000455 return false;
Paul Lawrenceaec34df2016-02-03 10:52:41 -0800456 }
457
Paul Crowley38132a12016-02-09 09:50:32 +0000458 s_global_de_initialized = true;
Paul Crowley76107cb2016-02-09 10:04:39 +0000459 return true;
Paul Lawrenceaec34df2016-02-03 10:52:41 -0800460}
461
Paul Crowley76107cb2016-02-09 10:04:39 +0000462bool e4crypt_init_user0() {
Paul Crowley8fb12fd2016-02-01 14:28:12 +0000463 LOG(DEBUG) << "e4crypt_init_user0";
464 if (e4crypt_is_native()) {
Paul Crowley76107cb2016-02-09 10:04:39 +0000465 if (!prepare_dir(user_key_dir, 0700, AID_ROOT, AID_ROOT)) return false;
466 if (!prepare_dir(user_key_dir + "/ce", 0700, AID_ROOT, AID_ROOT)) return false;
467 if (!prepare_dir(user_key_dir + "/de", 0700, AID_ROOT, AID_ROOT)) return false;
Paul Crowleya3630362016-05-17 14:17:56 -0700468 if (!path_exists(get_de_key_path(0))) {
Paul Crowley76107cb2016-02-09 10:04:39 +0000469 if (!create_and_install_user_keys(0, false)) return false;
Paul Crowley8fb12fd2016-02-01 14:28:12 +0000470 }
Jeff Sharkey47695b22016-02-01 17:02:29 -0700471 // TODO: switch to loading only DE_0 here once framework makes
472 // explicit calls to install DE keys for secondary users
Paul Crowley76107cb2016-02-09 10:04:39 +0000473 if (!load_all_de_keys()) return false;
Paul Crowley8fb12fd2016-02-01 14:28:12 +0000474 }
Jeff Sharkey47695b22016-02-01 17:02:29 -0700475 // We can only safely prepare DE storage here, since CE keys are probably
476 // entangled with user credentials. The framework will always prepare CE
477 // storage once CE keys are installed.
Paul Crowley76107cb2016-02-09 10:04:39 +0000478 if (!e4crypt_prepare_user_storage(nullptr, 0, 0, FLAG_STORAGE_DE)) {
Jeff Sharkey47695b22016-02-01 17:02:29 -0700479 LOG(ERROR) << "Failed to prepare user 0 storage";
Paul Crowley76107cb2016-02-09 10:04:39 +0000480 return false;
Jeff Sharkey47695b22016-02-01 17:02:29 -0700481 }
Jeff Sharkey0754a452016-02-08 12:21:42 -0700482
483 // If this is a non-FBE device that recently left an emulated mode,
484 // restore user data directories to known-good state.
485 if (!e4crypt_is_native() && !e4crypt_is_emulated()) {
Jeff Sharkey695d9282016-02-08 18:10:34 -0700486 e4crypt_unlock_user_key(0, 0, "!", "!");
Jeff Sharkey0754a452016-02-08 12:21:42 -0700487 }
488
Paul Crowley76107cb2016-02-09 10:04:39 +0000489 return true;
Paul Crowley8fb12fd2016-02-01 14:28:12 +0000490}
491
Paul Crowley76107cb2016-02-09 10:04:39 +0000492bool e4crypt_vold_create_user_key(userid_t user_id, int serial, bool ephemeral) {
Paul Crowley285956f2016-01-20 13:12:38 +0000493 LOG(DEBUG) << "e4crypt_vold_create_user_key for " << user_id << " serial " << serial;
Paul Crowleyea62e262016-01-28 12:23:53 +0000494 if (!e4crypt_is_native()) {
Paul Crowley76107cb2016-02-09 10:04:39 +0000495 return true;
Paul Crowleyea62e262016-01-28 12:23:53 +0000496 }
Paul Crowleyb1f3d242016-01-28 10:09:46 +0000497 // FIXME test for existence of key that is not loaded yet
498 if (s_ce_key_raw_refs.count(user_id) != 0) {
Paul Crowleydf528a72016-03-09 09:31:37 -0800499 LOG(ERROR) << "Already exists, can't e4crypt_vold_create_user_key for " << user_id
500 << " serial " << serial;
Paul Crowley285956f2016-01-20 13:12:38 +0000501 // FIXME should we fail the command?
Paul Crowley76107cb2016-02-09 10:04:39 +0000502 return true;
Jeff Sharkeyd2c96e72015-11-08 17:56:23 -0800503 }
Paul Crowleyb92f83c2016-02-01 14:10:43 +0000504 if (!create_and_install_user_keys(user_id, ephemeral)) {
Paul Crowley76107cb2016-02-09 10:04:39 +0000505 return false;
Paul Crowley285956f2016-01-20 13:12:38 +0000506 }
Paul Crowley76107cb2016-02-09 10:04:39 +0000507 return true;
Jeff Sharkeyd2c96e72015-11-08 17:56:23 -0800508}
509
Paul Crowleydf528a72016-03-09 09:31:37 -0800510static bool evict_key(const std::string& raw_ref) {
Paul Crowleyb1f3d242016-01-28 10:09:46 +0000511 auto ref = keyname(raw_ref);
Paul Crowleyd9b92952016-03-04 13:45:00 -0800512 key_serial_t device_keyring;
Paul Crowleya051eb72016-03-08 16:08:32 -0800513 if (!e4crypt_keyring(&device_keyring)) return false;
Paul Crowleyd9b92952016-03-04 13:45:00 -0800514 auto key_serial = keyctl_search(device_keyring, "logon", ref.c_str(), 0);
Paul Crowley1ef25582016-01-21 20:26:12 +0000515 if (keyctl_revoke(key_serial) != 0) {
Paul Crowley285956f2016-01-20 13:12:38 +0000516 PLOG(ERROR) << "Failed to revoke key with serial " << key_serial << " ref " << ref;
Paul Crowley1ef25582016-01-21 20:26:12 +0000517 return false;
Paul Crowley93363482015-07-07 15:17:22 +0100518 }
Paul Crowley1ef25582016-01-21 20:26:12 +0000519 LOG(DEBUG) << "Revoked key with serial " << key_serial << " ref " << ref;
520 return true;
521}
522
Paul Crowley76107cb2016-02-09 10:04:39 +0000523bool e4crypt_destroy_user_key(userid_t user_id) {
Paul Crowley1ef25582016-01-21 20:26:12 +0000524 LOG(DEBUG) << "e4crypt_destroy_user_key(" << user_id << ")";
Paul Crowleyea62e262016-01-28 12:23:53 +0000525 if (!e4crypt_is_native()) {
Paul Crowley76107cb2016-02-09 10:04:39 +0000526 return true;
Paul Crowleyea62e262016-01-28 12:23:53 +0000527 }
Paul Crowleyb1f3d242016-01-28 10:09:46 +0000528 bool success = true;
Paul Crowley05720802016-02-08 15:55:41 +0000529 s_ce_keys.erase(user_id);
Paul Crowleyb1f3d242016-01-28 10:09:46 +0000530 std::string raw_ref;
Paul Crowley71ee6622016-03-25 15:50:01 -0700531 // If we haven't loaded the CE key, no need to evict it.
532 if (lookup_key_ref(s_ce_key_raw_refs, user_id, &raw_ref)) {
533 success &= evict_key(raw_ref);
534 }
Paul Crowley05720802016-02-08 15:55:41 +0000535 s_ce_key_raw_refs.erase(user_id);
Paul Crowleya051eb72016-03-08 16:08:32 -0800536 success &= lookup_key_ref(s_de_key_raw_refs, user_id, &raw_ref) && evict_key(raw_ref);
Paul Crowley05720802016-02-08 15:55:41 +0000537 s_de_key_raw_refs.erase(user_id);
Paul Crowleyb1f3d242016-01-28 10:09:46 +0000538 auto it = s_ephemeral_users.find(user_id);
539 if (it != s_ephemeral_users.end()) {
540 s_ephemeral_users.erase(it);
Paul Crowley1ef25582016-01-21 20:26:12 +0000541 } else {
Paul Crowleya3630362016-05-17 14:17:56 -0700542 for (auto const path: get_ce_key_paths(get_ce_key_directory_path(user_id))) {
543 success &= android::vold::destroyKey(path);
544 }
Paul Crowleyb92f83c2016-02-01 14:10:43 +0000545 success &= android::vold::destroyKey(get_de_key_path(user_id));
Lenka Trochtova395039f2015-11-25 10:13:03 +0100546 }
Paul Crowley76107cb2016-02-09 10:04:39 +0000547 return success;
Paul Crowleyb33e8872015-05-19 12:34:09 +0100548}
Jeff Sharkeyd2c96e72015-11-08 17:56:23 -0800549
Paul Crowley76107cb2016-02-09 10:04:39 +0000550static bool emulated_lock(const std::string& path) {
Jeff Sharkey7a9dd952016-01-12 16:52:16 -0700551 if (chmod(path.c_str(), 0000) != 0) {
552 PLOG(ERROR) << "Failed to chmod " << path;
Paul Crowley76107cb2016-02-09 10:04:39 +0000553 return false;
Jeff Sharkey7a9dd952016-01-12 16:52:16 -0700554 }
555#if EMULATED_USES_SELINUX
556 if (setfilecon(path.c_str(), "u:object_r:storage_stub_file:s0") != 0) {
557 PLOG(WARNING) << "Failed to setfilecon " << path;
Paul Crowley76107cb2016-02-09 10:04:39 +0000558 return false;
Jeff Sharkey7a9dd952016-01-12 16:52:16 -0700559 }
560#endif
Paul Crowley76107cb2016-02-09 10:04:39 +0000561 return true;
Jeff Sharkey7a9dd952016-01-12 16:52:16 -0700562}
563
Paul Crowley76107cb2016-02-09 10:04:39 +0000564static bool emulated_unlock(const std::string& path, mode_t mode) {
Jeff Sharkey7a9dd952016-01-12 16:52:16 -0700565 if (chmod(path.c_str(), mode) != 0) {
566 PLOG(ERROR) << "Failed to chmod " << path;
Paul Crowleya042cb52016-01-21 17:24:49 +0000567 // FIXME temporary workaround for b/26713622
Paul Crowley76107cb2016-02-09 10:04:39 +0000568 if (e4crypt_is_emulated()) return false;
Jeff Sharkey7a9dd952016-01-12 16:52:16 -0700569 }
570#if EMULATED_USES_SELINUX
571 if (selinux_android_restorecon(path.c_str(), SELINUX_ANDROID_RESTORECON_FORCE) != 0) {
572 PLOG(WARNING) << "Failed to restorecon " << path;
Paul Crowleya042cb52016-01-21 17:24:49 +0000573 // FIXME temporary workaround for b/26713622
Paul Crowley76107cb2016-02-09 10:04:39 +0000574 if (e4crypt_is_emulated()) return false;
Jeff Sharkey7a9dd952016-01-12 16:52:16 -0700575 }
576#endif
Paul Crowley76107cb2016-02-09 10:04:39 +0000577 return true;
Jeff Sharkey7a9dd952016-01-12 16:52:16 -0700578}
579
Paul Crowleydf528a72016-03-09 09:31:37 -0800580static bool parse_hex(const char* hex, std::string* result) {
Paul Crowley05720802016-02-08 15:55:41 +0000581 if (strcmp("!", hex) == 0) {
Paul Crowleya051eb72016-03-08 16:08:32 -0800582 *result = "";
Paul Crowley05720802016-02-08 15:55:41 +0000583 return true;
584 }
Paul Crowleya051eb72016-03-08 16:08:32 -0800585 if (android::vold::HexToStr(hex, *result) != 0) {
Paul Crowleydf528a72016-03-09 09:31:37 -0800586 LOG(ERROR) << "Invalid FBE hex string"; // Don't log the string for security reasons
Paul Crowley05720802016-02-08 15:55:41 +0000587 return false;
588 }
589 return true;
590}
591
Paul Crowleya3630362016-05-17 14:17:56 -0700592bool e4crypt_add_user_key_auth(userid_t user_id, int serial, const char* token_hex,
593 const char* secret_hex) {
594 LOG(DEBUG) << "e4crypt_add_user_key_auth " << user_id << " serial=" << serial
Paul Crowleydf528a72016-03-09 09:31:37 -0800595 << " token_present=" << (strcmp(token_hex, "!") != 0);
Paul Crowley76107cb2016-02-09 10:04:39 +0000596 if (!e4crypt_is_native()) return true;
597 if (s_ephemeral_users.count(user_id) != 0) return true;
Paul Crowleya3630362016-05-17 14:17:56 -0700598 std::string token, secret;
Paul Crowleya051eb72016-03-08 16:08:32 -0800599 if (!parse_hex(token_hex, &token)) return false;
Paul Crowleya3630362016-05-17 14:17:56 -0700600 if (!parse_hex(secret_hex, &secret)) return false;
601 auto auth = secret.empty() ? kEmptyAuthentication
602 : android::vold::KeyAuthentication(token, secret);
Paul Crowley05720802016-02-08 15:55:41 +0000603 auto it = s_ce_keys.find(user_id);
604 if (it == s_ce_keys.end()) {
605 LOG(ERROR) << "Key not loaded into memory, can't change for user " << user_id;
Paul Crowley76107cb2016-02-09 10:04:39 +0000606 return false;
Paul Crowley05720802016-02-08 15:55:41 +0000607 }
608 auto ce_key = it->second;
Paul Crowleya3630362016-05-17 14:17:56 -0700609 auto const directory_path = get_ce_key_directory_path(user_id);
610 auto const paths = get_ce_key_paths(directory_path);
611 std::string ce_key_path;
612 if (!get_ce_key_new_path(directory_path, paths, &ce_key_path)) return false;
613 if (!store_key(ce_key_path, user_key_temp, auth, ce_key)) return false;
614 return true;
615}
616
617bool e4crypt_fixate_newest_user_key_auth(userid_t user_id) {
618 LOG(DEBUG) << "e4crypt_fixate_newest_user_key_auth " << user_id;
619 if (!e4crypt_is_native()) return true;
620 auto const directory_path = get_ce_key_directory_path(user_id);
621 auto const paths = get_ce_key_paths(directory_path);
622 if (paths.empty()) {
623 LOG(ERROR) << "No ce keys present, cannot fixate for user " << user_id;
624 return false;
Paul Crowleyad2eb642016-02-10 17:56:05 +0000625 }
Paul Crowleya3630362016-05-17 14:17:56 -0700626 fixate_user_ce_key(directory_path, paths[0], paths);
Paul Crowley76107cb2016-02-09 10:04:39 +0000627 return true;
Paul Crowley05720802016-02-08 15:55:41 +0000628}
629
Jeff Sharkey47695b22016-02-01 17:02:29 -0700630// TODO: rename to 'install' for consistency, and take flags to know which keys to install
Paul Crowleydf528a72016-03-09 09:31:37 -0800631bool e4crypt_unlock_user_key(userid_t user_id, int serial, const char* token_hex,
632 const char* secret_hex) {
633 LOG(DEBUG) << "e4crypt_unlock_user_key " << user_id << " serial=" << serial
634 << " token_present=" << (strcmp(token_hex, "!") != 0);
Jeff Sharkeyfc505c32015-12-07 17:27:01 -0700635 if (e4crypt_is_native()) {
Paul Crowley05720802016-02-08 15:55:41 +0000636 if (s_ce_key_raw_refs.count(user_id) != 0) {
637 LOG(WARNING) << "Tried to unlock already-unlocked key for user " << user_id;
Paul Crowley76107cb2016-02-09 10:04:39 +0000638 return true;
Paul Crowley05720802016-02-08 15:55:41 +0000639 }
640 std::string token, secret;
Paul Crowleya051eb72016-03-08 16:08:32 -0800641 if (!parse_hex(token_hex, &token)) return false;
642 if (!parse_hex(secret_hex, &secret)) return false;
Paul Crowley05720802016-02-08 15:55:41 +0000643 android::vold::KeyAuthentication auth(token, secret);
644 if (!read_and_install_user_ce_key(user_id, auth)) {
Paul Crowley8fb12fd2016-02-01 14:28:12 +0000645 LOG(ERROR) << "Couldn't read key for " << user_id;
Paul Crowley76107cb2016-02-09 10:04:39 +0000646 return false;
Jeff Sharkeyd2c96e72015-11-08 17:56:23 -0800647 }
Jeff Sharkeyfc505c32015-12-07 17:27:01 -0700648 } else {
649 // When in emulation mode, we just use chmod. However, we also
650 // unlock directories when not in emulation mode, to bring devices
651 // back into a known-good state.
Paul Crowley76107cb2016-02-09 10:04:39 +0000652 if (!emulated_unlock(android::vold::BuildDataSystemCePath(user_id), 0771) ||
Paul Crowleydf528a72016-03-09 09:31:37 -0800653 !emulated_unlock(android::vold::BuildDataMiscCePath(user_id), 01771) ||
Jeff Sharkeybe70c9a2016-04-14 20:45:16 -0600654 !emulated_unlock(android::vold::BuildDataMediaCePath(nullptr, user_id), 0770) ||
655 !emulated_unlock(android::vold::BuildDataUserCePath(nullptr, user_id), 0771)) {
Jeff Sharkey7a9dd952016-01-12 16:52:16 -0700656 LOG(ERROR) << "Failed to unlock user " << user_id;
Paul Crowley76107cb2016-02-09 10:04:39 +0000657 return false;
Jeff Sharkeyfc505c32015-12-07 17:27:01 -0700658 }
Jeff Sharkeyd2c96e72015-11-08 17:56:23 -0800659 }
Paul Crowley76107cb2016-02-09 10:04:39 +0000660 return true;
Jeff Sharkeyd2c96e72015-11-08 17:56:23 -0800661}
662
Jeff Sharkey47695b22016-02-01 17:02:29 -0700663// TODO: rename to 'evict' for consistency
Paul Crowley76107cb2016-02-09 10:04:39 +0000664bool e4crypt_lock_user_key(userid_t user_id) {
Jeff Sharkeyfc505c32015-12-07 17:27:01 -0700665 if (e4crypt_is_native()) {
666 // TODO: remove from kernel keyring
667 } else if (e4crypt_is_emulated()) {
Jeff Sharkeyd2c96e72015-11-08 17:56:23 -0800668 // When in emulation mode, we just use chmod
Paul Crowley76107cb2016-02-09 10:04:39 +0000669 if (!emulated_lock(android::vold::BuildDataSystemCePath(user_id)) ||
Paul Crowleydf528a72016-03-09 09:31:37 -0800670 !emulated_lock(android::vold::BuildDataMiscCePath(user_id)) ||
Jeff Sharkeybe70c9a2016-04-14 20:45:16 -0600671 !emulated_lock(android::vold::BuildDataMediaCePath(nullptr, user_id)) ||
672 !emulated_lock(android::vold::BuildDataUserCePath(nullptr, user_id))) {
Paul Crowley57eedbf2016-02-09 09:30:23 +0000673 LOG(ERROR) << "Failed to lock user " << user_id;
Paul Crowley76107cb2016-02-09 10:04:39 +0000674 return false;
Jeff Sharkeyd2c96e72015-11-08 17:56:23 -0800675 }
Jeff Sharkeyd2c96e72015-11-08 17:56:23 -0800676 }
Jeff Sharkeyfc505c32015-12-07 17:27:01 -0700677
Paul Crowley76107cb2016-02-09 10:04:39 +0000678 return true;
Jeff Sharkeyd2c96e72015-11-08 17:56:23 -0800679}
680
Paul Crowleydf528a72016-03-09 09:31:37 -0800681bool e4crypt_prepare_user_storage(const char* volume_uuid, userid_t user_id, int serial,
Jeff Sharkeybe70c9a2016-04-14 20:45:16 -0600682 int flags) {
Jeff Sharkey47695b22016-02-01 17:02:29 -0700683 LOG(DEBUG) << "e4crypt_prepare_user_storage for volume " << escape_null(volume_uuid)
Paul Crowleydf528a72016-03-09 09:31:37 -0800684 << ", user " << user_id << ", serial " << serial << ", flags " << flags;
Jeff Sharkey47695b22016-02-01 17:02:29 -0700685
686 if (flags & FLAG_STORAGE_DE) {
Jeff Sharkeybe70c9a2016-04-14 20:45:16 -0600687 // DE_sys key
688 auto system_legacy_path = android::vold::BuildDataSystemLegacyPath(user_id);
689 auto misc_legacy_path = android::vold::BuildDataMiscLegacyPath(user_id);
690 auto profiles_de_path = android::vold::BuildDataProfilesDePath(user_id);
691 auto foreign_de_path = android::vold::BuildDataProfilesForeignDexDePath(user_id);
692
693 // DE_n key
Jeff Sharkey47695b22016-02-01 17:02:29 -0700694 auto system_de_path = android::vold::BuildDataSystemDePath(user_id);
695 auto misc_de_path = android::vold::BuildDataMiscDePath(user_id);
696 auto user_de_path = android::vold::BuildDataUserDePath(volume_uuid, user_id);
697
Jeff Sharkeybe70c9a2016-04-14 20:45:16 -0600698 if (!prepare_dir(system_legacy_path, 0700, AID_SYSTEM, AID_SYSTEM)) return false;
699#if MANAGE_MISC_DIRS
700 if (!prepare_dir(misc_legacy_path, 0750, multiuser_get_uid(user_id, AID_SYSTEM),
701 multiuser_get_uid(user_id, AID_EVERYBODY))) return false;
702#endif
703 if (!prepare_dir(profiles_de_path, 0771, AID_SYSTEM, AID_SYSTEM)) return false;
704 if (!prepare_dir(foreign_de_path, 0773, AID_SYSTEM, AID_SYSTEM)) return false;
705
Paul Crowley76107cb2016-02-09 10:04:39 +0000706 if (!prepare_dir(system_de_path, 0770, AID_SYSTEM, AID_SYSTEM)) return false;
707 if (!prepare_dir(misc_de_path, 01771, AID_SYSTEM, AID_MISC)) return false;
708 if (!prepare_dir(user_de_path, 0771, AID_SYSTEM, AID_SYSTEM)) return false;
Calin Juravled1ee9442016-03-02 18:36:50 +0000709
Jeff Sharkeybe70c9a2016-04-14 20:45:16 -0600710 // For now, FBE is only supported on internal storage
711 if (e4crypt_is_native() && volume_uuid == nullptr) {
Jeff Sharkey47695b22016-02-01 17:02:29 -0700712 std::string de_raw_ref;
Paul Crowleya051eb72016-03-08 16:08:32 -0800713 if (!lookup_key_ref(s_de_key_raw_refs, user_id, &de_raw_ref)) return false;
Paul Crowley76107cb2016-02-09 10:04:39 +0000714 if (!ensure_policy(de_raw_ref, system_de_path)) return false;
715 if (!ensure_policy(de_raw_ref, misc_de_path)) return false;
716 if (!ensure_policy(de_raw_ref, user_de_path)) return false;
Jeff Sharkey47695b22016-02-01 17:02:29 -0700717 }
Paul Crowley285956f2016-01-20 13:12:38 +0000718 }
Jeff Sharkeyd2c96e72015-11-08 17:56:23 -0800719
Jeff Sharkey47695b22016-02-01 17:02:29 -0700720 if (flags & FLAG_STORAGE_CE) {
Jeff Sharkeybe70c9a2016-04-14 20:45:16 -0600721 // CE_n key
Jeff Sharkey47695b22016-02-01 17:02:29 -0700722 auto system_ce_path = android::vold::BuildDataSystemCePath(user_id);
723 auto misc_ce_path = android::vold::BuildDataMiscCePath(user_id);
Jeff Sharkeybe70c9a2016-04-14 20:45:16 -0600724 auto media_ce_path = android::vold::BuildDataMediaCePath(volume_uuid, user_id);
725 auto user_ce_path = android::vold::BuildDataUserCePath(volume_uuid, user_id);
Jeff Sharkeyd2c96e72015-11-08 17:56:23 -0800726
Paul Crowley76107cb2016-02-09 10:04:39 +0000727 if (!prepare_dir(system_ce_path, 0770, AID_SYSTEM, AID_SYSTEM)) return false;
728 if (!prepare_dir(misc_ce_path, 01771, AID_SYSTEM, AID_MISC)) return false;
729 if (!prepare_dir(media_ce_path, 0770, AID_MEDIA_RW, AID_MEDIA_RW)) return false;
730 if (!prepare_dir(user_ce_path, 0771, AID_SYSTEM, AID_SYSTEM)) return false;
Jeff Sharkey47695b22016-02-01 17:02:29 -0700731
Jeff Sharkeybe70c9a2016-04-14 20:45:16 -0600732 // For now, FBE is only supported on internal storage
733 if (e4crypt_is_native() && volume_uuid == nullptr) {
Jeff Sharkey47695b22016-02-01 17:02:29 -0700734 std::string ce_raw_ref;
Paul Crowleya051eb72016-03-08 16:08:32 -0800735 if (!lookup_key_ref(s_ce_key_raw_refs, user_id, &ce_raw_ref)) return false;
Paul Crowley76107cb2016-02-09 10:04:39 +0000736 if (!ensure_policy(ce_raw_ref, system_ce_path)) return false;
737 if (!ensure_policy(ce_raw_ref, misc_ce_path)) return false;
738 if (!ensure_policy(ce_raw_ref, media_ce_path)) return false;
739 if (!ensure_policy(ce_raw_ref, user_ce_path)) return false;
Jeff Sharkey47695b22016-02-01 17:02:29 -0700740 }
Jeff Sharkeyd2c96e72015-11-08 17:56:23 -0800741 }
742
Paul Crowley76107cb2016-02-09 10:04:39 +0000743 return true;
Jeff Sharkeyd2c96e72015-11-08 17:56:23 -0800744}
Jeff Sharkeybe70c9a2016-04-14 20:45:16 -0600745
746bool e4crypt_destroy_user_storage(const char* volume_uuid, userid_t user_id, int flags) {
747 LOG(DEBUG) << "e4crypt_destroy_user_storage for volume " << escape_null(volume_uuid)
748 << ", user " << user_id << ", flags " << flags;
749 bool res = true;
750
751 if (flags & FLAG_STORAGE_DE) {
752 // DE_sys key
753 auto system_legacy_path = android::vold::BuildDataSystemLegacyPath(user_id);
754 auto misc_legacy_path = android::vold::BuildDataMiscLegacyPath(user_id);
755 auto profiles_de_path = android::vold::BuildDataProfilesDePath(user_id);
756 auto foreign_de_path = android::vold::BuildDataProfilesForeignDexDePath(user_id);
757
758 // DE_n key
759 auto system_de_path = android::vold::BuildDataSystemDePath(user_id);
760 auto misc_de_path = android::vold::BuildDataMiscDePath(user_id);
761 auto user_de_path = android::vold::BuildDataUserDePath(volume_uuid, user_id);
762
763 if (volume_uuid == nullptr) {
764 res &= destroy_dir(system_legacy_path);
765#if MANAGE_MISC_DIRS
766 res &= destroy_dir(misc_legacy_path);
767#endif
768 res &= destroy_dir(profiles_de_path);
769 res &= destroy_dir(foreign_de_path);
770 res &= destroy_dir(system_de_path);
771 res &= destroy_dir(misc_de_path);
772 }
773 res &= destroy_dir(user_de_path);
774 }
775
776 if (flags & FLAG_STORAGE_CE) {
777 // CE_n key
778 auto system_ce_path = android::vold::BuildDataSystemCePath(user_id);
779 auto misc_ce_path = android::vold::BuildDataMiscCePath(user_id);
780 auto media_ce_path = android::vold::BuildDataMediaCePath(volume_uuid, user_id);
781 auto user_ce_path = android::vold::BuildDataUserCePath(volume_uuid, user_id);
782
783 if (volume_uuid == nullptr) {
784 res &= destroy_dir(system_ce_path);
785 res &= destroy_dir(misc_ce_path);
786 }
787 res &= destroy_dir(media_ce_path);
788 res &= destroy_dir(user_ce_path);
789 }
790
791 return res;
792}