2 * Copyright (C) 2016 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 "KeyStorage.h"
19 #include "Checkpoint.h"
20 #include "Keymaster.h"
21 #include "ScryptParameters.h"
33 #include <sys/types.h>
37 #include <openssl/err.h>
38 #include <openssl/evp.h>
39 #include <openssl/sha.h>
41 #include <android-base/file.h>
42 #include <android-base/logging.h>
43 #include <android-base/properties.h>
44 #include <android-base/unique_fd.h>
46 #include <cutils/properties.h>
48 #include <hardware/hw_auth_token.h>
52 #include "crypto_scrypt.h"
58 const KeyAuthentication kEmptyAuthentication{""};
60 static constexpr size_t AES_KEY_BYTES = 32;
61 static constexpr size_t GCM_NONCE_BYTES = 12;
62 static constexpr size_t GCM_MAC_BYTES = 16;
63 static constexpr size_t SALT_BYTES = 1 << 4;
64 static constexpr size_t SECDISCARDABLE_BYTES = 1 << 14;
65 static constexpr size_t STRETCHED_BYTES = 1 << 6;
67 static constexpr uint32_t AUTH_TIMEOUT = 30; // Seconds
69 static const char* kCurrentVersion = "1";
70 static const char* kRmPath = "/system/bin/rm";
71 static const char* kSecdiscardPath = "/system/bin/secdiscard";
72 static const char* kStretch_none = "none";
73 static const char* kStretch_nopassword = "nopassword";
74 static const std::string kStretchPrefix_scrypt = "scrypt ";
75 static const char* kHashPrefix_secdiscardable = "Android secdiscardable SHA512";
76 static const char* kHashPrefix_keygen = "Android key wrapping key generation SHA512";
77 static const char* kFn_encrypted_key = "encrypted_key";
78 static const char* kFn_keymaster_key_blob = "keymaster_key_blob";
79 static const char* kFn_keymaster_key_blob_upgraded = "keymaster_key_blob_upgraded";
80 static const char* kFn_salt = "salt";
81 static const char* kFn_secdiscardable = "secdiscardable";
82 static const char* kFn_stretching = "stretching";
83 static const char* kFn_version = "version";
87 // Storage binding info for ensuring key encryption keys include a
88 // platform-provided seed in their derivation.
89 struct StorageBindingInfo {
92 IN_USE, // key storage keys are bound to seed
93 NOT_USED, // key storage keys are NOT bound to seed
96 // Binding seed mixed into all key storage keys.
97 std::vector<uint8_t> seed;
99 // State tracker for the key storage key binding.
100 State state = State::UNINITIALIZED;
105 // Never freed as the dtor is non-trivial.
106 StorageBindingInfo& storage_binding_info = *new StorageBindingInfo;
110 static bool checkSize(const std::string& kind, size_t actual, size_t expected) {
111 if (actual != expected) {
112 LOG(ERROR) << "Wrong number of bytes in " << kind << ", expected " << expected << " got "
119 static void hashWithPrefix(char const* prefix, const std::string& tohash, std::string* res) {
123 // Personalise the hashing by introducing a fixed prefix.
124 // Hashing applications should use personalization except when there is a
125 // specific reason not to; see section 4.11 of https://www.schneier.com/skein1.3.pdf
126 std::string hashingPrefix = prefix;
127 hashingPrefix.resize(SHA512_CBLOCK);
128 SHA512_Update(&c, hashingPrefix.data(), hashingPrefix.size());
129 SHA512_Update(&c, tohash.data(), tohash.size());
130 res->assign(SHA512_DIGEST_LENGTH, '\0');
131 SHA512_Final(reinterpret_cast<uint8_t*>(&(*res)[0]), &c);
134 // Generates a keymaster key, using rollback resistance if supported.
135 static bool generateKeymasterKey(Keymaster& keymaster,
136 const km::AuthorizationSetBuilder& paramBuilder,
138 auto paramsWithRollback = paramBuilder;
139 paramsWithRollback.Authorization(km::TAG_ROLLBACK_RESISTANCE);
141 if (!keymaster.generateKey(paramsWithRollback, key)) {
142 LOG(WARNING) << "Failed to generate rollback-resistant key. This is expected if keymaster "
143 "doesn't support rollback resistance. Falling back to "
144 "non-rollback-resistant key.";
145 if (!keymaster.generateKey(paramBuilder, key)) return false;
150 static bool generateKeyStorageKey(Keymaster& keymaster, const std::string& appId,
152 auto paramBuilder = km::AuthorizationSetBuilder()
153 .AesEncryptionKey(AES_KEY_BYTES * 8)
154 .GcmModeMinMacLen(GCM_MAC_BYTES * 8)
155 .Authorization(km::TAG_APPLICATION_ID, appId)
156 .Authorization(km::TAG_NO_AUTH_REQUIRED);
157 LOG(DEBUG) << "Generating \"key storage\" key that doesn't need auth token";
158 return generateKeymasterKey(keymaster, paramBuilder, key);
161 bool generateWrappedStorageKey(KeyBuffer* key) {
163 if (!keymaster) return false;
164 std::string key_temp;
165 auto paramBuilder = km::AuthorizationSetBuilder().AesEncryptionKey(AES_KEY_BYTES * 8);
166 paramBuilder.Authorization(km::TAG_STORAGE_KEY);
167 if (!generateKeymasterKey(keymaster, paramBuilder, &key_temp)) return false;
168 *key = KeyBuffer(key_temp.size());
169 memcpy(reinterpret_cast<void*>(key->data()), key_temp.c_str(), key->size());
173 bool exportWrappedStorageKey(const KeyBuffer& kmKey, KeyBuffer* key) {
175 if (!keymaster) return false;
176 std::string key_temp;
178 if (!keymaster.exportKey(kmKey, &key_temp)) return false;
179 *key = KeyBuffer(key_temp.size());
180 memcpy(reinterpret_cast<void*>(key->data()), key_temp.c_str(), key->size());
184 static km::AuthorizationSet beginParams(const std::string& appId) {
185 return km::AuthorizationSetBuilder()
186 .GcmModeMacLen(GCM_MAC_BYTES * 8)
187 .Authorization(km::TAG_APPLICATION_ID, appId);
190 static bool readFileToString(const std::string& filename, std::string* result) {
191 if (!android::base::ReadFileToString(filename, result)) {
192 PLOG(ERROR) << "Failed to read from " << filename;
198 static bool readRandomBytesOrLog(size_t count, std::string* out) {
199 auto status = ReadRandomBytes(count, *out);
201 LOG(ERROR) << "Random read failed with status: " << status;
207 bool createSecdiscardable(const std::string& filename, std::string* hash) {
208 std::string secdiscardable;
209 if (!readRandomBytesOrLog(SECDISCARDABLE_BYTES, &secdiscardable)) return false;
210 if (!writeStringToFile(secdiscardable, filename)) return false;
211 hashWithPrefix(kHashPrefix_secdiscardable, secdiscardable, hash);
215 bool readSecdiscardable(const std::string& filename, std::string* hash) {
216 std::string secdiscardable;
217 if (!readFileToString(filename, &secdiscardable)) return false;
218 hashWithPrefix(kHashPrefix_secdiscardable, secdiscardable, hash);
222 static std::mutex key_upgrade_lock;
224 // List of key directories that have had their Keymaster key upgraded during
225 // this boot and written to "keymaster_key_blob_upgraded", but replacing the old
226 // key was delayed due to an active checkpoint. Protected by key_upgrade_lock.
227 static std::vector<std::string> key_dirs_to_commit;
229 // Replaces |dir|/keymaster_key_blob with |dir|/keymaster_key_blob_upgraded and
230 // deletes the old key from Keymaster.
231 static bool CommitUpgradedKey(Keymaster& keymaster, const std::string& dir) {
232 auto blob_file = dir + "/" + kFn_keymaster_key_blob;
233 auto upgraded_blob_file = dir + "/" + kFn_keymaster_key_blob_upgraded;
236 if (!readFileToString(blob_file, &blob)) return false;
238 if (rename(upgraded_blob_file.c_str(), blob_file.c_str()) != 0) {
239 PLOG(ERROR) << "Failed to rename " << upgraded_blob_file << " to " << blob_file;
242 // Ensure that the rename is persisted before deleting the Keymaster key.
243 if (!FsyncDirectory(dir)) return false;
245 if (!keymaster || !keymaster.deleteKey(blob)) {
246 LOG(WARNING) << "Failed to delete old key " << blob_file
247 << " from Keymaster; continuing anyway";
248 // Continue on, but the space in Keymaster used by the old key won't be freed.
253 static void DeferredCommitKeys() {
254 android::base::WaitForProperty("vold.checkpoint_committed", "1");
255 LOG(INFO) << "Committing upgraded keys";
258 LOG(ERROR) << "Failed to open Keymaster; old keys won't be deleted from Keymaster";
259 // Continue on, but the space in Keymaster used by the old keys won't be freed.
261 std::lock_guard<std::mutex> lock(key_upgrade_lock);
262 for (auto& dir : key_dirs_to_commit) {
263 LOG(INFO) << "Committing upgraded key " << dir;
264 CommitUpgradedKey(keymaster, dir);
266 key_dirs_to_commit.clear();
269 // Returns true if the Keymaster key in |dir| has already been upgraded and is
270 // pending being committed. Assumes that key_upgrade_lock is held.
271 static bool IsKeyCommitPending(const std::string& dir) {
272 for (const auto& dir_to_commit : key_dirs_to_commit) {
273 if (IsSameFile(dir, dir_to_commit)) return true;
278 // Schedules the upgraded Keymaster key in |dir| to be committed later.
279 // Assumes that key_upgrade_lock is held.
280 static void ScheduleKeyCommit(const std::string& dir) {
281 if (key_dirs_to_commit.empty()) std::thread(DeferredCommitKeys).detach();
282 key_dirs_to_commit.push_back(dir);
285 static void CancelPendingKeyCommit(const std::string& dir) {
286 std::lock_guard<std::mutex> lock(key_upgrade_lock);
287 for (auto it = key_dirs_to_commit.begin(); it != key_dirs_to_commit.end(); it++) {
288 if (IsSameFile(*it, dir)) {
289 LOG(DEBUG) << "Cancelling pending commit of upgraded key " << dir
290 << " because it is being destroyed";
291 key_dirs_to_commit.erase(it);
297 // Deletes a leftover upgraded key, if present. An upgraded key can be left
298 // over if an update failed, or if we rebooted before committing the key in a
299 // freak accident. Either way, we can re-upgrade the key if we need to.
300 static void DeleteUpgradedKey(Keymaster& keymaster, const std::string& path) {
301 if (pathExists(path)) {
302 LOG(DEBUG) << "Deleting leftover upgraded key " << path;
304 if (!android::base::ReadFileToString(path, &blob)) {
305 LOG(WARNING) << "Failed to read leftover upgraded key " << path
306 << "; continuing anyway";
307 } else if (!keymaster.deleteKey(blob)) {
308 LOG(WARNING) << "Failed to delete leftover upgraded key " << path
309 << " from Keymaster; continuing anyway";
311 if (unlink(path.c_str()) != 0) {
312 LOG(WARNING) << "Failed to unlink leftover upgraded key " << path
313 << "; continuing anyway";
318 // Begins a Keymaster operation using the key stored in |dir|.
319 static KeymasterOperation BeginKeymasterOp(Keymaster& keymaster, const std::string& dir,
320 const km::AuthorizationSet& keyParams,
321 const km::AuthorizationSet& opParams,
322 km::AuthorizationSet* outParams) {
323 km::AuthorizationSet inParams(keyParams);
324 inParams.append(opParams.begin(), opParams.end());
326 auto blob_file = dir + "/" + kFn_keymaster_key_blob;
327 auto upgraded_blob_file = dir + "/" + kFn_keymaster_key_blob_upgraded;
329 std::lock_guard<std::mutex> lock(key_upgrade_lock);
332 bool already_upgraded = IsKeyCommitPending(dir);
333 if (already_upgraded) {
336 << " was already upgraded and is waiting to be committed; using the upgraded blob";
337 if (!readFileToString(upgraded_blob_file, &blob)) return KeymasterOperation();
339 DeleteUpgradedKey(keymaster, upgraded_blob_file);
340 if (!readFileToString(blob_file, &blob)) return KeymasterOperation();
343 auto opHandle = keymaster.begin(blob, inParams, outParams);
344 if (!opHandle) return opHandle;
346 // If key blob wasn't upgraded, nothing left to do.
347 if (!opHandle.getUpgradedBlob()) return opHandle;
349 if (already_upgraded) {
350 LOG(ERROR) << "Unexpected case; already-upgraded key " << upgraded_blob_file
351 << " still requires upgrade";
352 return KeymasterOperation();
354 LOG(INFO) << "Upgrading key: " << blob_file;
355 if (!writeStringToFile(*opHandle.getUpgradedBlob(), upgraded_blob_file))
356 return KeymasterOperation();
357 if (cp_needsCheckpoint()) {
358 LOG(INFO) << "Wrote upgraded key to " << upgraded_blob_file
359 << "; delaying commit due to checkpoint";
360 ScheduleKeyCommit(dir);
362 if (!CommitUpgradedKey(keymaster, dir)) return KeymasterOperation();
363 LOG(INFO) << "Key upgraded: " << blob_file;
368 static bool encryptWithKeymasterKey(Keymaster& keymaster, const std::string& dir,
369 const km::AuthorizationSet& keyParams,
370 const KeyBuffer& message, std::string* ciphertext) {
371 km::AuthorizationSet opParams =
372 km::AuthorizationSetBuilder().Authorization(km::TAG_PURPOSE, km::KeyPurpose::ENCRYPT);
373 km::AuthorizationSet outParams;
374 auto opHandle = BeginKeymasterOp(keymaster, dir, keyParams, opParams, &outParams);
375 if (!opHandle) return false;
376 auto nonceBlob = outParams.GetTagValue(km::TAG_NONCE);
378 LOG(ERROR) << "GCM encryption but no nonce generated";
381 // nonceBlob here is just a pointer into existing data, must not be freed
382 std::string nonce(nonceBlob.value().get().begin(), nonceBlob.value().get().end());
383 if (!checkSize("nonce", nonce.size(), GCM_NONCE_BYTES)) return false;
385 if (!opHandle.updateCompletely(message, &body)) return false;
388 if (!opHandle.finish(&mac)) return false;
389 if (!checkSize("mac", mac.size(), GCM_MAC_BYTES)) return false;
390 *ciphertext = nonce + body + mac;
394 static bool decryptWithKeymasterKey(Keymaster& keymaster, const std::string& dir,
395 const km::AuthorizationSet& keyParams,
396 const std::string& ciphertext, KeyBuffer* message) {
397 const std::string nonce = ciphertext.substr(0, GCM_NONCE_BYTES);
398 auto bodyAndMac = ciphertext.substr(GCM_NONCE_BYTES);
399 auto opParams = km::AuthorizationSetBuilder()
400 .Authorization(km::TAG_NONCE, nonce)
401 .Authorization(km::TAG_PURPOSE, km::KeyPurpose::DECRYPT);
402 auto opHandle = BeginKeymasterOp(keymaster, dir, keyParams, opParams, nullptr);
403 if (!opHandle) return false;
404 if (!opHandle.updateCompletely(bodyAndMac, message)) return false;
405 if (!opHandle.finish(nullptr)) return false;
409 static std::string getStretching(const KeyAuthentication& auth) {
410 if (auth.usesKeymaster()) {
411 return kStretch_nopassword;
413 return kStretch_none;
417 static bool stretchSecret(const std::string& stretching, const std::string& secret,
418 const std::string& salt, std::string* stretched) {
419 if (stretching == kStretch_nopassword) {
420 if (!secret.empty()) {
421 LOG(WARNING) << "Password present but stretching is nopassword";
425 } else if (stretching == kStretch_none) {
428 LOG(ERROR) << "Unknown stretching type: " << stretching;
434 static bool generateAppId(const KeyAuthentication& auth, const std::string& stretching,
435 const std::string& salt, const std::string& secdiscardable_hash,
436 std::string* appId) {
437 std::string stretched;
438 if (!stretchSecret(stretching, auth.secret, salt, &stretched)) return false;
439 *appId = secdiscardable_hash + stretched;
441 const std::lock_guard<std::mutex> scope_lock(storage_binding_info.guard);
442 switch (storage_binding_info.state) {
443 case StorageBindingInfo::State::UNINITIALIZED:
444 storage_binding_info.state = StorageBindingInfo::State::NOT_USED;
446 case StorageBindingInfo::State::IN_USE:
447 appId->append(storage_binding_info.seed.begin(), storage_binding_info.seed.end());
449 case StorageBindingInfo::State::NOT_USED:
457 static void logOpensslError() {
458 LOG(ERROR) << "Openssl error: " << ERR_get_error();
461 static bool encryptWithoutKeymaster(const std::string& preKey, const KeyBuffer& plaintext,
462 std::string* ciphertext) {
464 hashWithPrefix(kHashPrefix_keygen, preKey, &key);
465 key.resize(AES_KEY_BYTES);
466 if (!readRandomBytesOrLog(GCM_NONCE_BYTES, ciphertext)) return false;
467 auto ctx = std::unique_ptr<EVP_CIPHER_CTX, decltype(&::EVP_CIPHER_CTX_free)>(
468 EVP_CIPHER_CTX_new(), EVP_CIPHER_CTX_free);
473 if (1 != EVP_EncryptInit_ex(ctx.get(), EVP_aes_256_gcm(), NULL,
474 reinterpret_cast<const uint8_t*>(key.data()),
475 reinterpret_cast<const uint8_t*>(ciphertext->data()))) {
479 ciphertext->resize(GCM_NONCE_BYTES + plaintext.size() + GCM_MAC_BYTES);
481 if (1 != EVP_EncryptUpdate(
482 ctx.get(), reinterpret_cast<uint8_t*>(&(*ciphertext)[0] + GCM_NONCE_BYTES),
483 &outlen, reinterpret_cast<const uint8_t*>(plaintext.data()), plaintext.size())) {
487 if (outlen != static_cast<int>(plaintext.size())) {
488 LOG(ERROR) << "GCM ciphertext length should be " << plaintext.size() << " was " << outlen;
491 if (1 != EVP_EncryptFinal_ex(
493 reinterpret_cast<uint8_t*>(&(*ciphertext)[0] + GCM_NONCE_BYTES + plaintext.size()),
499 LOG(ERROR) << "GCM EncryptFinal should be 0, was " << outlen;
502 if (1 != EVP_CIPHER_CTX_ctrl(ctx.get(), EVP_CTRL_GCM_GET_TAG, GCM_MAC_BYTES,
503 reinterpret_cast<uint8_t*>(&(*ciphertext)[0] + GCM_NONCE_BYTES +
504 plaintext.size()))) {
511 static bool decryptWithoutKeymaster(const std::string& preKey, const std::string& ciphertext,
512 KeyBuffer* plaintext) {
513 if (ciphertext.size() < GCM_NONCE_BYTES + GCM_MAC_BYTES) {
514 LOG(ERROR) << "GCM ciphertext too small: " << ciphertext.size();
518 hashWithPrefix(kHashPrefix_keygen, preKey, &key);
519 key.resize(AES_KEY_BYTES);
520 auto ctx = std::unique_ptr<EVP_CIPHER_CTX, decltype(&::EVP_CIPHER_CTX_free)>(
521 EVP_CIPHER_CTX_new(), EVP_CIPHER_CTX_free);
526 if (1 != EVP_DecryptInit_ex(ctx.get(), EVP_aes_256_gcm(), NULL,
527 reinterpret_cast<const uint8_t*>(key.data()),
528 reinterpret_cast<const uint8_t*>(ciphertext.data()))) {
532 *plaintext = KeyBuffer(ciphertext.size() - GCM_NONCE_BYTES - GCM_MAC_BYTES);
534 if (1 != EVP_DecryptUpdate(ctx.get(), reinterpret_cast<uint8_t*>(&(*plaintext)[0]), &outlen,
535 reinterpret_cast<const uint8_t*>(ciphertext.data() + GCM_NONCE_BYTES),
536 plaintext->size())) {
540 if (outlen != static_cast<int>(plaintext->size())) {
541 LOG(ERROR) << "GCM plaintext length should be " << plaintext->size() << " was " << outlen;
544 if (1 != EVP_CIPHER_CTX_ctrl(ctx.get(), EVP_CTRL_GCM_SET_TAG, GCM_MAC_BYTES,
545 const_cast<void*>(reinterpret_cast<const void*>(
546 ciphertext.data() + GCM_NONCE_BYTES + plaintext->size())))) {
550 if (1 != EVP_DecryptFinal_ex(ctx.get(),
551 reinterpret_cast<uint8_t*>(&(*plaintext)[0] + plaintext->size()),
557 LOG(ERROR) << "GCM EncryptFinal should be 0, was " << outlen;
563 bool storeKey(const std::string& dir, const KeyAuthentication& auth, const KeyBuffer& key) {
564 if (TEMP_FAILURE_RETRY(mkdir(dir.c_str(), 0700)) == -1) {
565 PLOG(ERROR) << "key mkdir " << dir;
568 if (!writeStringToFile(kCurrentVersion, dir + "/" + kFn_version)) return false;
569 std::string secdiscardable_hash;
570 if (!createSecdiscardable(dir + "/" + kFn_secdiscardable, &secdiscardable_hash)) return false;
571 std::string stretching = getStretching(auth);
572 if (!writeStringToFile(stretching, dir + "/" + kFn_stretching)) return false;
575 if (!generateAppId(auth, stretching, salt, secdiscardable_hash, &appId)) return false;
576 std::string encryptedKey;
577 if (auth.usesKeymaster()) {
579 if (!keymaster) return false;
581 if (!generateKeyStorageKey(keymaster, appId, &kmKey)) return false;
582 if (!writeStringToFile(kmKey, dir + "/" + kFn_keymaster_key_blob)) return false;
583 km::AuthorizationSet keyParams = beginParams(appId);
584 if (!encryptWithKeymasterKey(keymaster, dir, keyParams, key, &encryptedKey)) return false;
586 if (!encryptWithoutKeymaster(appId, key, &encryptedKey)) return false;
588 if (!writeStringToFile(encryptedKey, dir + "/" + kFn_encrypted_key)) return false;
589 if (!FsyncDirectory(dir)) return false;
593 bool storeKeyAtomically(const std::string& key_path, const std::string& tmp_path,
594 const KeyAuthentication& auth, const KeyBuffer& key) {
595 if (pathExists(key_path)) {
596 LOG(ERROR) << "Already exists, cannot create key at: " << key_path;
599 if (pathExists(tmp_path)) {
600 LOG(DEBUG) << "Already exists, destroying: " << tmp_path;
601 destroyKey(tmp_path); // May be partially created so ignore errors
603 if (!storeKey(tmp_path, auth, key)) return false;
604 if (rename(tmp_path.c_str(), key_path.c_str()) != 0) {
605 PLOG(ERROR) << "Unable to move new key to location: " << key_path;
608 if (!FsyncParentDirectory(key_path)) return false;
609 LOG(DEBUG) << "Created key: " << key_path;
613 bool retrieveKey(const std::string& dir, const KeyAuthentication& auth, KeyBuffer* key) {
615 if (!readFileToString(dir + "/" + kFn_version, &version)) return false;
616 if (version != kCurrentVersion) {
617 LOG(ERROR) << "Version mismatch, expected " << kCurrentVersion << " got " << version;
620 std::string secdiscardable_hash;
621 if (!readSecdiscardable(dir + "/" + kFn_secdiscardable, &secdiscardable_hash)) return false;
622 std::string stretching;
623 if (!readFileToString(dir + "/" + kFn_stretching, &stretching)) return false;
626 if (!generateAppId(auth, stretching, salt, secdiscardable_hash, &appId)) return false;
627 std::string encryptedMessage;
628 if (!readFileToString(dir + "/" + kFn_encrypted_key, &encryptedMessage)) return false;
629 if (auth.usesKeymaster()) {
631 if (!keymaster) return false;
632 km::AuthorizationSet keyParams = beginParams(appId);
633 if (!decryptWithKeymasterKey(keymaster, dir, keyParams, encryptedMessage, key))
636 if (!decryptWithoutKeymaster(appId, encryptedMessage, key)) return false;
641 static bool DeleteKeymasterKey(const std::string& blob_file) {
643 if (!readFileToString(blob_file, &blob)) return false;
645 if (!keymaster) return false;
646 LOG(DEBUG) << "Deleting key " << blob_file << " from Keymaster";
647 if (!keymaster.deleteKey(blob)) return false;
651 bool runSecdiscardSingle(const std::string& file) {
652 if (ForkExecvp(std::vector<std::string>{kSecdiscardPath, "--", file}) != 0) {
653 LOG(ERROR) << "secdiscard failed";
659 static bool recursiveDeleteKey(const std::string& dir) {
660 if (ForkExecvp(std::vector<std::string>{kRmPath, "-rf", dir}) != 0) {
661 LOG(ERROR) << "recursive delete failed";
667 bool destroyKey(const std::string& dir) {
670 CancelPendingKeyCommit(dir);
672 auto secdiscard_cmd = std::vector<std::string>{
675 dir + "/" + kFn_encrypted_key,
676 dir + "/" + kFn_secdiscardable,
678 // Try each thing, even if previous things failed.
680 for (auto& fn : {kFn_keymaster_key_blob, kFn_keymaster_key_blob_upgraded}) {
681 auto blob_file = dir + "/" + fn;
682 if (pathExists(blob_file)) {
683 success &= DeleteKeymasterKey(blob_file);
684 secdiscard_cmd.push_back(blob_file);
687 if (ForkExecvp(secdiscard_cmd) != 0) {
688 LOG(ERROR) << "secdiscard failed";
691 success &= recursiveDeleteKey(dir);
695 bool setKeyStorageBindingSeed(const std::vector<uint8_t>& seed) {
696 const std::lock_guard<std::mutex> scope_lock(storage_binding_info.guard);
697 switch (storage_binding_info.state) {
698 case StorageBindingInfo::State::UNINITIALIZED:
699 storage_binding_info.state = StorageBindingInfo::State::IN_USE;
700 storage_binding_info.seed = seed;
702 case StorageBindingInfo::State::IN_USE:
703 LOG(ERROR) << "key storage binding seed already set";
705 case StorageBindingInfo::State::NOT_USED:
706 LOG(ERROR) << "key storage already in use without binding";
713 } // namespace android