2 * Copyright (C) 2015 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 #include "Ext4Crypt.h"
19 #include "KeyStorage.h"
33 #include <openssl/sha.h>
34 #include <selinux/android.h>
36 #include <sys/mount.h>
38 #include <sys/types.h>
40 #include <private/android_filesystem_config.h>
43 #include "ext4_crypt.h"
44 #include "key_control.h"
46 #define EMULATED_USES_SELINUX 0
47 #define MANAGE_MISC_DIRS 0
49 #include <cutils/fs.h>
51 #include <android-base/file.h>
52 #include <android-base/logging.h>
53 #include <android-base/stringprintf.h>
55 using android::base::StringPrintf;
56 using android::vold::kEmptyAuthentication;
58 // NOTE: keep in sync with StorageManager
59 static constexpr int FLAG_STORAGE_DE = 1 << 0;
60 static constexpr int FLAG_STORAGE_CE = 1 << 1;
63 const std::string device_key_dir = std::string() + DATA_MNT_POINT + e4crypt_unencrypted_folder;
64 const std::string device_key_path = device_key_dir + "/key";
65 const std::string device_key_temp = device_key_dir + "/temp";
67 const std::string user_key_dir = std::string() + DATA_MNT_POINT + "/misc/vold/user_keys";
68 const std::string user_key_temp = user_key_dir + "/temp";
70 bool s_global_de_initialized = false;
72 // Some users are ephemeral, don't try to wipe their keys from disk
73 std::set<userid_t> s_ephemeral_users;
75 // Map user ids to key references
76 std::map<userid_t, std::string> s_de_key_raw_refs;
77 std::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.
80 std::map<userid_t, std::string> s_ce_keys;
82 // ext4enc:TODO get this const from somewhere good
83 const int EXT4_KEY_DESCRIPTOR_SIZE = 8;
85 // ext4enc:TODO Include structure from somewhere sensible
86 // MUST be in sync with ext4_crypto.c in kernel
87 constexpr int EXT4_ENCRYPTION_MODE_AES_256_XTS = 1;
88 constexpr int EXT4_AES_256_XTS_KEY_SIZE = 64;
89 constexpr int EXT4_MAX_KEY_SIZE = 64;
90 struct ext4_encryption_key {
92 char raw[EXT4_MAX_KEY_SIZE];
97 static bool e4crypt_is_emulated() {
98 return property_get_bool("persist.sys.emulate_fbe", false);
101 static const char* escape_null(const char* value) {
102 return (value == nullptr) ? "null" : value;
105 // Get raw keyref - used to make keyname and to pass to ioctl
106 static std::string generate_key_ref(const char* key, int length) {
110 SHA512_Update(&c, key, length);
111 unsigned char key_ref1[SHA512_DIGEST_LENGTH];
112 SHA512_Final(key_ref1, &c);
115 SHA512_Update(&c, key_ref1, SHA512_DIGEST_LENGTH);
116 unsigned char key_ref2[SHA512_DIGEST_LENGTH];
117 SHA512_Final(key_ref2, &c);
119 static_assert(EXT4_KEY_DESCRIPTOR_SIZE <= SHA512_DIGEST_LENGTH,
120 "Hash too short for descriptor");
121 return std::string((char*)key_ref2, EXT4_KEY_DESCRIPTOR_SIZE);
124 static bool fill_key(const std::string& key, ext4_encryption_key* ext4_key) {
125 if (key.size() != EXT4_AES_256_XTS_KEY_SIZE) {
126 LOG(ERROR) << "Wrong size key " << key.size();
129 static_assert(EXT4_AES_256_XTS_KEY_SIZE <= sizeof(ext4_key->raw), "Key too long!");
130 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());
137 static std::string keyname(const std::string& raw_ref) {
138 std::ostringstream o;
140 for (auto i : raw_ref) {
141 o << std::hex << std::setw(2) << std::setfill('0') << (int)i;
146 // Get the keyring we store all keys in
147 static bool e4crypt_keyring(key_serial_t* device_keyring) {
148 *device_keyring = keyctl_search(KEY_SPEC_SESSION_KEYRING, "keyring", "e4crypt", 0);
149 if (*device_keyring == -1) {
150 PLOG(ERROR) << "Unable to find device keyring";
156 // Install password into global keyring
157 // Return raw key reference for use in policy
158 static bool install_key(const std::string& key, std::string* raw_ref) {
159 ext4_encryption_key ext4_key;
160 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);
163 key_serial_t device_keyring;
164 if (!e4crypt_keyring(&device_keyring)) return false;
165 key_serial_t key_id =
166 add_key("logon", ref.c_str(), (void*)&ext4_key, sizeof(ext4_key), device_keyring);
168 PLOG(ERROR) << "Failed to insert key into keyring " << device_keyring;
171 LOG(DEBUG) << "Added key " << key_id << " (" << ref << ") to keyring " << device_keyring
172 << " in process " << getpid();
176 static std::string get_de_key_path(userid_t user_id) {
177 return StringPrintf("%s/de/%d", user_key_dir.c_str(), user_id);
180 static std::string get_ce_key_directory_path(userid_t user_id) {
181 return StringPrintf("%s/ce/%d", user_key_dir.c_str(), user_id);
184 // Returns the keys newest first
185 static 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);
188 PLOG(ERROR) << "Unable to open ce key directory: " + directory_path;
189 return std::vector<std::string>();
191 std::vector<std::string> result;
194 auto const entry = readdir(dirp.get());
197 PLOG(ERROR) << "Unable to read ce key directory: " + directory_path;
198 return std::vector<std::string>();
202 if (entry->d_type != DT_DIR || entry->d_name[0] != 'c') {
203 LOG(DEBUG) << "Skipping non-key " << entry->d_name;
206 result.emplace_back(directory_path + "/" + entry->d_name);
208 std::sort(result.begin(), result.end());
209 std::reverse(result.begin(), result.end());
213 static std::string get_ce_key_current_path(const std::string& directory_path) {
214 return directory_path + "/current";
217 static bool get_ce_key_new_path(const std::string& directory_path,
218 const std::vector<std::string>& paths,
219 std::string *ce_key_path) {
221 *ce_key_path = get_ce_key_current_path(directory_path);
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;
234 // Discard all keys but the named one; rename it to canonical name.
235 // No point in acting on errors in this; ignore them.
236 static 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);
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;
252 static 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);
265 LOG(ERROR) << "Failed to find working ce key for user " << user_id;
269 static bool read_and_install_user_ce_key(userid_t user_id,
270 const android::vold::KeyAuthentication& auth) {
271 if (s_ce_key_raw_refs.count(user_id) != 0) return true;
273 if (!read_and_fixate_user_ce_key(user_id, auth, &ce_key)) return false;
274 std::string ce_raw_ref;
275 if (!install_key(ce_key, &ce_raw_ref)) return false;
276 s_ce_keys[user_id] = ce_key;
277 s_ce_key_raw_refs[user_id] = ce_raw_ref;
278 LOG(DEBUG) << "Installed ce key for user " << user_id;
282 static bool prepare_dir(const std::string& dir, mode_t mode, uid_t uid, gid_t gid) {
283 LOG(DEBUG) << "Preparing: " << dir;
284 if (fs_prepare_dir(dir.c_str(), mode, uid, gid) != 0) {
285 PLOG(ERROR) << "Failed to prepare " << dir;
291 static 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;
300 static bool random_key(std::string* key) {
301 if (android::vold::ReadRandomBytes(EXT4_AES_256_XTS_KEY_SIZE, *key) != 0) {
302 // TODO status_t plays badly with PLOG, fix it.
303 LOG(ERROR) << "Random read failed";
309 static bool path_exists(const std::string& path) {
310 return access(path.c_str(), F_OK) == 0;
313 // NB this assumes that there is only one thread listening for crypt commands, because
314 // it creates keys in a fixed location.
315 static bool store_key(const std::string& key_path, const std::string& tmp_path,
316 const android::vold::KeyAuthentication& auth, const std::string& key) {
317 if (path_exists(key_path)) {
318 LOG(ERROR) << "Already exists, cannot create key at: " << key_path;
321 if (path_exists(tmp_path)) {
322 android::vold::destroyKey(tmp_path); // May be partially created so ignore errors
324 if (!android::vold::storeKey(tmp_path, auth, key)) return false;
325 if (rename(tmp_path.c_str(), key_path.c_str()) != 0) {
326 PLOG(ERROR) << "Unable to move new key to location: " << key_path;
329 LOG(DEBUG) << "Created key " << key_path;
333 static bool create_and_install_user_keys(userid_t user_id, bool create_ephemeral) {
334 std::string de_key, ce_key;
335 if (!random_key(&de_key)) return false;
336 if (!random_key(&ce_key)) return false;
337 if (create_ephemeral) {
338 // If the key should be created as ephemeral, don't store it.
339 s_ephemeral_users.insert(user_id);
341 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.
350 if (!store_key(get_de_key_path(user_id), user_key_temp,
351 kEmptyAuthentication, de_key)) return false;
353 std::string de_raw_ref;
354 if (!install_key(de_key, &de_raw_ref)) return false;
355 s_de_key_raw_refs[user_id] = de_raw_ref;
356 std::string ce_raw_ref;
357 if (!install_key(ce_key, &ce_raw_ref)) return false;
358 s_ce_keys[user_id] = ce_key;
359 s_ce_key_raw_refs[user_id] = ce_raw_ref;
360 LOG(DEBUG) << "Created keys for user " << user_id;
364 static bool lookup_key_ref(const std::map<userid_t, std::string>& key_map, userid_t user_id,
365 std::string* raw_ref) {
366 auto refi = key_map.find(user_id);
367 if (refi == key_map.end()) {
368 LOG(ERROR) << "Cannot find key for " << user_id;
371 *raw_ref = refi->second;
375 static bool ensure_policy(const std::string& raw_ref, const std::string& path) {
376 if (e4crypt_policy_ensure(path.c_str(), raw_ref.data(), raw_ref.size()) != 0) {
377 LOG(ERROR) << "Failed to set policy on: " << path;
383 static bool is_numeric(const char* name) {
384 for (const char* p = name; *p != '\0'; p++) {
385 if (!isdigit(*p)) return false;
390 static bool load_all_de_keys() {
391 auto de_dir = user_key_dir + "/de";
392 auto dirp = std::unique_ptr<DIR, int (*)(DIR*)>(opendir(de_dir.c_str()), closedir);
394 PLOG(ERROR) << "Unable to read de key directory";
399 auto entry = readdir(dirp.get());
402 PLOG(ERROR) << "Unable to read de key directory";
407 if (entry->d_type != DT_DIR || !is_numeric(entry->d_name)) {
408 LOG(DEBUG) << "Skipping non-de-key " << entry->d_name;
411 userid_t user_id = atoi(entry->d_name);
412 if (s_de_key_raw_refs.count(user_id) == 0) {
413 auto key_path = de_dir + "/" + entry->d_name;
415 if (!android::vold::retrieveKey(key_path, kEmptyAuthentication, &key)) return false;
417 if (!install_key(key, &raw_ref)) return false;
418 s_de_key_raw_refs[user_id] = raw_ref;
419 LOG(DEBUG) << "Installed de key for user " << user_id;
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.
427 bool e4crypt_initialize_global_de() {
428 LOG(INFO) << "e4crypt_initialize_global_de";
430 if (s_global_de_initialized) {
431 LOG(INFO) << "Already initialized";
435 std::string device_key;
436 if (path_exists(device_key_path)) {
437 if (!android::vold::retrieveKey(device_key_path,
438 kEmptyAuthentication, &device_key)) return false;
440 LOG(INFO) << "Creating new key";
441 if (!random_key(&device_key)) return false;
442 if (!store_key(device_key_path, device_key_temp,
443 kEmptyAuthentication, device_key)) return false;
446 std::string device_key_ref;
447 if (!install_key(device_key, &device_key_ref)) {
448 LOG(ERROR) << "Failed to install device key";
452 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";
458 s_global_de_initialized = true;
462 bool e4crypt_init_user0() {
463 LOG(DEBUG) << "e4crypt_init_user0";
464 if (e4crypt_is_native()) {
465 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;
468 if (!path_exists(get_de_key_path(0))) {
469 if (!create_and_install_user_keys(0, false)) return false;
471 // TODO: switch to loading only DE_0 here once framework makes
472 // explicit calls to install DE keys for secondary users
473 if (!load_all_de_keys()) return false;
475 // 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.
478 if (!e4crypt_prepare_user_storage(nullptr, 0, 0, FLAG_STORAGE_DE)) {
479 LOG(ERROR) << "Failed to prepare user 0 storage";
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()) {
486 e4crypt_unlock_user_key(0, 0, "!", "!");
492 bool e4crypt_vold_create_user_key(userid_t user_id, int serial, bool ephemeral) {
493 LOG(DEBUG) << "e4crypt_vold_create_user_key for " << user_id << " serial " << serial;
494 if (!e4crypt_is_native()) {
497 // FIXME test for existence of key that is not loaded yet
498 if (s_ce_key_raw_refs.count(user_id) != 0) {
499 LOG(ERROR) << "Already exists, can't e4crypt_vold_create_user_key for " << user_id
500 << " serial " << serial;
501 // FIXME should we fail the command?
504 if (!create_and_install_user_keys(user_id, ephemeral)) {
510 static bool evict_key(const std::string& raw_ref) {
511 auto ref = keyname(raw_ref);
512 key_serial_t device_keyring;
513 if (!e4crypt_keyring(&device_keyring)) return false;
514 auto key_serial = keyctl_search(device_keyring, "logon", ref.c_str(), 0);
515 if (keyctl_revoke(key_serial) != 0) {
516 PLOG(ERROR) << "Failed to revoke key with serial " << key_serial << " ref " << ref;
519 LOG(DEBUG) << "Revoked key with serial " << key_serial << " ref " << ref;
523 bool e4crypt_destroy_user_key(userid_t user_id) {
524 LOG(DEBUG) << "e4crypt_destroy_user_key(" << user_id << ")";
525 if (!e4crypt_is_native()) {
529 s_ce_keys.erase(user_id);
531 // 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);
535 s_ce_key_raw_refs.erase(user_id);
536 success &= lookup_key_ref(s_de_key_raw_refs, user_id, &raw_ref) && evict_key(raw_ref);
537 s_de_key_raw_refs.erase(user_id);
538 auto it = s_ephemeral_users.find(user_id);
539 if (it != s_ephemeral_users.end()) {
540 s_ephemeral_users.erase(it);
542 for (auto const path: get_ce_key_paths(get_ce_key_directory_path(user_id))) {
543 success &= android::vold::destroyKey(path);
545 success &= android::vold::destroyKey(get_de_key_path(user_id));
550 static bool emulated_lock(const std::string& path) {
551 if (chmod(path.c_str(), 0000) != 0) {
552 PLOG(ERROR) << "Failed to chmod " << path;
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;
564 static bool emulated_unlock(const std::string& path, mode_t mode) {
565 if (chmod(path.c_str(), mode) != 0) {
566 PLOG(ERROR) << "Failed to chmod " << path;
567 // FIXME temporary workaround for b/26713622
568 if (e4crypt_is_emulated()) return false;
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;
573 // FIXME temporary workaround for b/26713622
574 if (e4crypt_is_emulated()) return false;
580 static bool parse_hex(const char* hex, std::string* result) {
581 if (strcmp("!", hex) == 0) {
585 if (android::vold::HexToStr(hex, *result) != 0) {
586 LOG(ERROR) << "Invalid FBE hex string"; // Don't log the string for security reasons
592 bool 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
595 << " token_present=" << (strcmp(token_hex, "!") != 0);
596 if (!e4crypt_is_native()) return true;
597 if (s_ephemeral_users.count(user_id) != 0) return true;
598 std::string token, secret;
599 if (!parse_hex(token_hex, &token)) return false;
600 if (!parse_hex(secret_hex, &secret)) return false;
601 auto auth = secret.empty() ? kEmptyAuthentication
602 : android::vold::KeyAuthentication(token, secret);
603 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;
608 auto ce_key = it->second;
609 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;
617 bool 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);
623 LOG(ERROR) << "No ce keys present, cannot fixate for user " << user_id;
626 fixate_user_ce_key(directory_path, paths[0], paths);
630 // TODO: rename to 'install' for consistency, and take flags to know which keys to install
631 bool 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);
635 if (e4crypt_is_native()) {
636 if (s_ce_key_raw_refs.count(user_id) != 0) {
637 LOG(WARNING) << "Tried to unlock already-unlocked key for user " << user_id;
640 std::string token, secret;
641 if (!parse_hex(token_hex, &token)) return false;
642 if (!parse_hex(secret_hex, &secret)) return false;
643 android::vold::KeyAuthentication auth(token, secret);
644 if (!read_and_install_user_ce_key(user_id, auth)) {
645 LOG(ERROR) << "Couldn't read key for " << user_id;
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.
652 if (!emulated_unlock(android::vold::BuildDataSystemCePath(user_id), 0771) ||
653 !emulated_unlock(android::vold::BuildDataMiscCePath(user_id), 01771) ||
654 !emulated_unlock(android::vold::BuildDataMediaCePath(nullptr, user_id), 0770) ||
655 !emulated_unlock(android::vold::BuildDataUserCePath(nullptr, user_id), 0771)) {
656 LOG(ERROR) << "Failed to unlock user " << user_id;
663 // TODO: rename to 'evict' for consistency
664 bool e4crypt_lock_user_key(userid_t user_id) {
665 if (e4crypt_is_native()) {
666 // TODO: remove from kernel keyring
667 } else if (e4crypt_is_emulated()) {
668 // When in emulation mode, we just use chmod
669 if (!emulated_lock(android::vold::BuildDataSystemCePath(user_id)) ||
670 !emulated_lock(android::vold::BuildDataMiscCePath(user_id)) ||
671 !emulated_lock(android::vold::BuildDataMediaCePath(nullptr, user_id)) ||
672 !emulated_lock(android::vold::BuildDataUserCePath(nullptr, user_id))) {
673 LOG(ERROR) << "Failed to lock user " << user_id;
681 bool e4crypt_prepare_user_storage(const char* volume_uuid, userid_t user_id, int serial,
683 LOG(DEBUG) << "e4crypt_prepare_user_storage for volume " << escape_null(volume_uuid)
684 << ", user " << user_id << ", serial " << serial << ", flags " << flags;
686 if (flags & FLAG_STORAGE_DE) {
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);
694 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);
698 if (!prepare_dir(system_legacy_path, 0700, AID_SYSTEM, AID_SYSTEM)) return false;
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;
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;
706 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;
710 // For now, FBE is only supported on internal storage
711 if (e4crypt_is_native() && volume_uuid == nullptr) {
712 std::string de_raw_ref;
713 if (!lookup_key_ref(s_de_key_raw_refs, user_id, &de_raw_ref)) return false;
714 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;
720 if (flags & FLAG_STORAGE_CE) {
722 auto system_ce_path = android::vold::BuildDataSystemCePath(user_id);
723 auto misc_ce_path = android::vold::BuildDataMiscCePath(user_id);
724 auto media_ce_path = android::vold::BuildDataMediaCePath(volume_uuid, user_id);
725 auto user_ce_path = android::vold::BuildDataUserCePath(volume_uuid, user_id);
727 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;
732 // For now, FBE is only supported on internal storage
733 if (e4crypt_is_native() && volume_uuid == nullptr) {
734 std::string ce_raw_ref;
735 if (!lookup_key_ref(s_ce_key_raw_refs, user_id, &ce_raw_ref)) return false;
736 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;
746 bool 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;
751 if (flags & FLAG_STORAGE_DE) {
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);
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);
763 if (volume_uuid == nullptr) {
764 res &= destroy_dir(system_legacy_path);
766 res &= destroy_dir(misc_legacy_path);
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);
773 res &= destroy_dir(user_de_path);
776 if (flags & FLAG_STORAGE_CE) {
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);
783 if (volume_uuid == nullptr) {
784 res &= destroy_dir(system_ce_path);
785 res &= destroy_dir(misc_ce_path);
787 res &= destroy_dir(media_ce_path);
788 res &= destroy_dir(user_ce_path);