Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 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 | |
Janis Danisevskis | 011675d | 2016-09-01 11:41:29 +0100 | [diff] [blame] | 17 | #define LOG_TAG "keystore" |
| 18 | |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 19 | #include "key_store_service.h" |
| 20 | |
| 21 | #include <fcntl.h> |
| 22 | #include <sys/stat.h> |
| 23 | |
Janis Danisevskis | 7612fd4 | 2016-09-01 11:50:02 +0100 | [diff] [blame] | 24 | #include <algorithm> |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 25 | #include <sstream> |
| 26 | |
| 27 | #include <binder/IPCThreadState.h> |
| 28 | |
| 29 | #include <private/android_filesystem_config.h> |
| 30 | |
| 31 | #include <hardware/keymaster_defs.h> |
| 32 | |
| 33 | #include "defaults.h" |
Janis Danisevskis | 18f27ad | 2016-06-01 13:57:40 -0700 | [diff] [blame] | 34 | #include "keystore_attestation_id.h" |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 35 | #include "keystore_utils.h" |
| 36 | |
Shawn Willden | 98c5916 | 2016-03-20 09:10:18 -0600 | [diff] [blame] | 37 | using keymaster::AuthorizationSet; |
| 38 | using keymaster::AuthorizationSetBuilder; |
| 39 | using keymaster::TAG_APPLICATION_DATA; |
| 40 | using keymaster::TAG_APPLICATION_ID; |
| 41 | |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 42 | namespace android { |
| 43 | |
| 44 | const size_t MAX_OPERATIONS = 15; |
| 45 | |
| 46 | struct BIGNUM_Delete { |
| 47 | void operator()(BIGNUM* p) const { BN_free(p); } |
| 48 | }; |
| 49 | typedef UniquePtr<BIGNUM, BIGNUM_Delete> Unique_BIGNUM; |
| 50 | |
Shawn Willden | 98c5916 | 2016-03-20 09:10:18 -0600 | [diff] [blame] | 51 | struct Malloc_Delete { |
| 52 | void operator()(uint8_t* p) const { free(p); } |
| 53 | }; |
| 54 | |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 55 | void KeyStoreService::binderDied(const wp<IBinder>& who) { |
| 56 | auto operations = mOperationMap.getOperationsForToken(who.unsafe_get()); |
Chih-Hung Hsieh | 24b2a39 | 2016-07-28 10:35:24 -0700 | [diff] [blame] | 57 | for (const auto& token : operations) { |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 58 | abort(token); |
| 59 | } |
| 60 | } |
| 61 | |
| 62 | int32_t KeyStoreService::getState(int32_t userId) { |
| 63 | if (!checkBinderPermission(P_GET_STATE)) { |
| 64 | return ::PERMISSION_DENIED; |
| 65 | } |
| 66 | |
| 67 | return mKeyStore->getState(userId); |
| 68 | } |
| 69 | |
| 70 | int32_t KeyStoreService::get(const String16& name, int32_t uid, uint8_t** item, |
| 71 | size_t* itemLength) { |
| 72 | uid_t targetUid = getEffectiveUid(uid); |
| 73 | if (!checkBinderPermission(P_GET, targetUid)) { |
| 74 | return ::PERMISSION_DENIED; |
| 75 | } |
| 76 | |
| 77 | String8 name8(name); |
| 78 | Blob keyBlob; |
| 79 | |
| 80 | ResponseCode responseCode = mKeyStore->getKeyForName(&keyBlob, name8, targetUid, TYPE_GENERIC); |
| 81 | if (responseCode != ::NO_ERROR) { |
| 82 | *item = NULL; |
| 83 | *itemLength = 0; |
| 84 | return responseCode; |
| 85 | } |
| 86 | |
| 87 | *item = (uint8_t*)malloc(keyBlob.getLength()); |
| 88 | memcpy(*item, keyBlob.getValue(), keyBlob.getLength()); |
| 89 | *itemLength = keyBlob.getLength(); |
| 90 | |
| 91 | return ::NO_ERROR; |
| 92 | } |
| 93 | |
| 94 | int32_t KeyStoreService::insert(const String16& name, const uint8_t* item, size_t itemLength, |
| 95 | int targetUid, int32_t flags) { |
| 96 | targetUid = getEffectiveUid(targetUid); |
| 97 | int32_t result = |
| 98 | checkBinderPermissionAndKeystoreState(P_INSERT, targetUid, flags & KEYSTORE_FLAG_ENCRYPTED); |
| 99 | if (result != ::NO_ERROR) { |
| 100 | return result; |
| 101 | } |
| 102 | |
| 103 | String8 name8(name); |
Tucker Sylvestro | 0ab28b7 | 2016-08-05 18:02:47 -0400 | [diff] [blame] | 104 | String8 filename(mKeyStore->getKeyNameForUidWithDir(name8, targetUid, ::TYPE_GENERIC)); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 105 | |
| 106 | Blob keyBlob(item, itemLength, NULL, 0, ::TYPE_GENERIC); |
| 107 | keyBlob.setEncrypted(flags & KEYSTORE_FLAG_ENCRYPTED); |
| 108 | |
| 109 | return mKeyStore->put(filename.string(), &keyBlob, get_user_id(targetUid)); |
| 110 | } |
| 111 | |
| 112 | int32_t KeyStoreService::del(const String16& name, int targetUid) { |
| 113 | targetUid = getEffectiveUid(targetUid); |
| 114 | if (!checkBinderPermission(P_DELETE, targetUid)) { |
| 115 | return ::PERMISSION_DENIED; |
| 116 | } |
| 117 | String8 name8(name); |
Tucker Sylvestro | 0ab28b7 | 2016-08-05 18:02:47 -0400 | [diff] [blame] | 118 | String8 filename(mKeyStore->getKeyNameForUidWithDir(name8, targetUid, ::TYPE_ANY)); |
| 119 | int32_t result = mKeyStore->del(filename.string(), ::TYPE_ANY, get_user_id(targetUid)); |
| 120 | if (result != ::NO_ERROR) { |
| 121 | return result; |
| 122 | } |
| 123 | |
| 124 | // Also delete any characteristics files |
| 125 | String8 chrFilename(mKeyStore->getKeyNameForUidWithDir( |
| 126 | name8, targetUid, ::TYPE_KEY_CHARACTERISTICS)); |
| 127 | return mKeyStore->del(chrFilename.string(), ::TYPE_KEY_CHARACTERISTICS, get_user_id(targetUid)); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 128 | } |
| 129 | |
| 130 | int32_t KeyStoreService::exist(const String16& name, int targetUid) { |
| 131 | targetUid = getEffectiveUid(targetUid); |
| 132 | if (!checkBinderPermission(P_EXIST, targetUid)) { |
| 133 | return ::PERMISSION_DENIED; |
| 134 | } |
| 135 | |
| 136 | String8 name8(name); |
Tucker Sylvestro | 0ab28b7 | 2016-08-05 18:02:47 -0400 | [diff] [blame] | 137 | String8 filename(mKeyStore->getKeyNameForUidWithDir(name8, targetUid, ::TYPE_ANY)); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 138 | |
| 139 | if (access(filename.string(), R_OK) == -1) { |
| 140 | return (errno != ENOENT) ? ::SYSTEM_ERROR : ::KEY_NOT_FOUND; |
| 141 | } |
| 142 | return ::NO_ERROR; |
| 143 | } |
| 144 | |
| 145 | int32_t KeyStoreService::list(const String16& prefix, int targetUid, Vector<String16>* matches) { |
| 146 | targetUid = getEffectiveUid(targetUid); |
| 147 | if (!checkBinderPermission(P_LIST, targetUid)) { |
| 148 | return ::PERMISSION_DENIED; |
| 149 | } |
| 150 | const String8 prefix8(prefix); |
Tucker Sylvestro | 0ab28b7 | 2016-08-05 18:02:47 -0400 | [diff] [blame] | 151 | String8 filename(mKeyStore->getKeyNameForUid(prefix8, targetUid, TYPE_ANY)); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 152 | |
| 153 | if (mKeyStore->list(filename, matches, get_user_id(targetUid)) != ::NO_ERROR) { |
| 154 | return ::SYSTEM_ERROR; |
| 155 | } |
| 156 | return ::NO_ERROR; |
| 157 | } |
| 158 | |
| 159 | int32_t KeyStoreService::reset() { |
| 160 | if (!checkBinderPermission(P_RESET)) { |
| 161 | return ::PERMISSION_DENIED; |
| 162 | } |
| 163 | |
| 164 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
| 165 | mKeyStore->resetUser(get_user_id(callingUid), false); |
| 166 | return ::NO_ERROR; |
| 167 | } |
| 168 | |
| 169 | int32_t KeyStoreService::onUserPasswordChanged(int32_t userId, const String16& password) { |
| 170 | if (!checkBinderPermission(P_PASSWORD)) { |
| 171 | return ::PERMISSION_DENIED; |
| 172 | } |
| 173 | |
| 174 | const String8 password8(password); |
| 175 | // Flush the auth token table to prevent stale tokens from sticking |
| 176 | // around. |
| 177 | mAuthTokenTable.Clear(); |
| 178 | |
| 179 | if (password.size() == 0) { |
| 180 | ALOGI("Secure lockscreen for user %d removed, deleting encrypted entries", userId); |
| 181 | mKeyStore->resetUser(userId, true); |
| 182 | return ::NO_ERROR; |
| 183 | } else { |
| 184 | switch (mKeyStore->getState(userId)) { |
| 185 | case ::STATE_UNINITIALIZED: { |
| 186 | // generate master key, encrypt with password, write to file, |
| 187 | // initialize mMasterKey*. |
| 188 | return mKeyStore->initializeUser(password8, userId); |
| 189 | } |
| 190 | case ::STATE_NO_ERROR: { |
| 191 | // rewrite master key with new password. |
| 192 | return mKeyStore->writeMasterKey(password8, userId); |
| 193 | } |
| 194 | case ::STATE_LOCKED: { |
| 195 | ALOGE("Changing user %d's password while locked, clearing old encryption", userId); |
| 196 | mKeyStore->resetUser(userId, true); |
| 197 | return mKeyStore->initializeUser(password8, userId); |
| 198 | } |
| 199 | } |
| 200 | return ::SYSTEM_ERROR; |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | int32_t KeyStoreService::onUserAdded(int32_t userId, int32_t parentId) { |
| 205 | if (!checkBinderPermission(P_USER_CHANGED)) { |
| 206 | return ::PERMISSION_DENIED; |
| 207 | } |
| 208 | |
| 209 | // Sanity check that the new user has an empty keystore. |
| 210 | if (!mKeyStore->isEmpty(userId)) { |
| 211 | ALOGW("New user %d's keystore not empty. Clearing old entries.", userId); |
| 212 | } |
| 213 | // Unconditionally clear the keystore, just to be safe. |
| 214 | mKeyStore->resetUser(userId, false); |
| 215 | if (parentId != -1) { |
| 216 | // This profile must share the same master key password as the parent profile. Because the |
| 217 | // password of the parent profile is not known here, the best we can do is copy the parent's |
| 218 | // master key and master key file. This makes this profile use the same master key as the |
| 219 | // parent profile, forever. |
| 220 | return mKeyStore->copyMasterKey(parentId, userId); |
| 221 | } else { |
| 222 | return ::NO_ERROR; |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | int32_t KeyStoreService::onUserRemoved(int32_t userId) { |
| 227 | if (!checkBinderPermission(P_USER_CHANGED)) { |
| 228 | return ::PERMISSION_DENIED; |
| 229 | } |
| 230 | |
| 231 | mKeyStore->resetUser(userId, false); |
| 232 | return ::NO_ERROR; |
| 233 | } |
| 234 | |
| 235 | int32_t KeyStoreService::lock(int32_t userId) { |
| 236 | if (!checkBinderPermission(P_LOCK)) { |
| 237 | return ::PERMISSION_DENIED; |
| 238 | } |
| 239 | |
| 240 | State state = mKeyStore->getState(userId); |
| 241 | if (state != ::STATE_NO_ERROR) { |
| 242 | ALOGD("calling lock in state: %d", state); |
| 243 | return state; |
| 244 | } |
| 245 | |
| 246 | mKeyStore->lock(userId); |
| 247 | return ::NO_ERROR; |
| 248 | } |
| 249 | |
| 250 | int32_t KeyStoreService::unlock(int32_t userId, const String16& pw) { |
| 251 | if (!checkBinderPermission(P_UNLOCK)) { |
| 252 | return ::PERMISSION_DENIED; |
| 253 | } |
| 254 | |
| 255 | State state = mKeyStore->getState(userId); |
| 256 | if (state != ::STATE_LOCKED) { |
| 257 | switch (state) { |
| 258 | case ::STATE_NO_ERROR: |
| 259 | ALOGI("calling unlock when already unlocked, ignoring."); |
| 260 | break; |
| 261 | case ::STATE_UNINITIALIZED: |
| 262 | ALOGE("unlock called on uninitialized keystore."); |
| 263 | break; |
| 264 | default: |
| 265 | ALOGE("unlock called on keystore in unknown state: %d", state); |
| 266 | break; |
| 267 | } |
| 268 | return state; |
| 269 | } |
| 270 | |
| 271 | const String8 password8(pw); |
| 272 | // read master key, decrypt with password, initialize mMasterKey*. |
| 273 | return mKeyStore->readMasterKey(password8, userId); |
| 274 | } |
| 275 | |
| 276 | bool KeyStoreService::isEmpty(int32_t userId) { |
| 277 | if (!checkBinderPermission(P_IS_EMPTY)) { |
| 278 | return false; |
| 279 | } |
| 280 | |
| 281 | return mKeyStore->isEmpty(userId); |
| 282 | } |
| 283 | |
| 284 | int32_t KeyStoreService::generate(const String16& name, int32_t targetUid, int32_t keyType, |
| 285 | int32_t keySize, int32_t flags, Vector<sp<KeystoreArg>>* args) { |
| 286 | targetUid = getEffectiveUid(targetUid); |
| 287 | int32_t result = |
| 288 | checkBinderPermissionAndKeystoreState(P_INSERT, targetUid, flags & KEYSTORE_FLAG_ENCRYPTED); |
| 289 | if (result != ::NO_ERROR) { |
| 290 | return result; |
| 291 | } |
| 292 | |
| 293 | KeymasterArguments params; |
| 294 | add_legacy_key_authorizations(keyType, ¶ms.params); |
| 295 | |
| 296 | switch (keyType) { |
| 297 | case EVP_PKEY_EC: { |
| 298 | params.params.push_back(keymaster_param_enum(KM_TAG_ALGORITHM, KM_ALGORITHM_EC)); |
| 299 | if (keySize == -1) { |
| 300 | keySize = EC_DEFAULT_KEY_SIZE; |
| 301 | } else if (keySize < EC_MIN_KEY_SIZE || keySize > EC_MAX_KEY_SIZE) { |
| 302 | ALOGI("invalid key size %d", keySize); |
| 303 | return ::SYSTEM_ERROR; |
| 304 | } |
| 305 | params.params.push_back(keymaster_param_int(KM_TAG_KEY_SIZE, keySize)); |
| 306 | break; |
| 307 | } |
| 308 | case EVP_PKEY_RSA: { |
| 309 | params.params.push_back(keymaster_param_enum(KM_TAG_ALGORITHM, KM_ALGORITHM_RSA)); |
| 310 | if (keySize == -1) { |
| 311 | keySize = RSA_DEFAULT_KEY_SIZE; |
| 312 | } else if (keySize < RSA_MIN_KEY_SIZE || keySize > RSA_MAX_KEY_SIZE) { |
| 313 | ALOGI("invalid key size %d", keySize); |
| 314 | return ::SYSTEM_ERROR; |
| 315 | } |
| 316 | params.params.push_back(keymaster_param_int(KM_TAG_KEY_SIZE, keySize)); |
| 317 | unsigned long exponent = RSA_DEFAULT_EXPONENT; |
| 318 | if (args->size() > 1) { |
| 319 | ALOGI("invalid number of arguments: %zu", args->size()); |
| 320 | return ::SYSTEM_ERROR; |
| 321 | } else if (args->size() == 1) { |
Chih-Hung Hsieh | 24b2a39 | 2016-07-28 10:35:24 -0700 | [diff] [blame] | 322 | const sp<KeystoreArg>& expArg = args->itemAt(0); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 323 | if (expArg != NULL) { |
| 324 | Unique_BIGNUM pubExpBn(BN_bin2bn( |
| 325 | reinterpret_cast<const unsigned char*>(expArg->data()), expArg->size(), NULL)); |
| 326 | if (pubExpBn.get() == NULL) { |
| 327 | ALOGI("Could not convert public exponent to BN"); |
| 328 | return ::SYSTEM_ERROR; |
| 329 | } |
| 330 | exponent = BN_get_word(pubExpBn.get()); |
| 331 | if (exponent == 0xFFFFFFFFL) { |
| 332 | ALOGW("cannot represent public exponent as a long value"); |
| 333 | return ::SYSTEM_ERROR; |
| 334 | } |
| 335 | } else { |
| 336 | ALOGW("public exponent not read"); |
| 337 | return ::SYSTEM_ERROR; |
| 338 | } |
| 339 | } |
| 340 | params.params.push_back(keymaster_param_long(KM_TAG_RSA_PUBLIC_EXPONENT, exponent)); |
| 341 | break; |
| 342 | } |
| 343 | default: { |
| 344 | ALOGW("Unsupported key type %d", keyType); |
| 345 | return ::SYSTEM_ERROR; |
| 346 | } |
| 347 | } |
| 348 | |
| 349 | int32_t rc = generateKey(name, params, NULL, 0, targetUid, flags, |
| 350 | /*outCharacteristics*/ NULL); |
| 351 | if (rc != ::NO_ERROR) { |
| 352 | ALOGW("generate failed: %d", rc); |
| 353 | } |
| 354 | return translateResultToLegacyResult(rc); |
| 355 | } |
| 356 | |
| 357 | int32_t KeyStoreService::import(const String16& name, const uint8_t* data, size_t length, |
| 358 | int targetUid, int32_t flags) { |
| 359 | const uint8_t* ptr = data; |
| 360 | |
| 361 | Unique_PKCS8_PRIV_KEY_INFO pkcs8(d2i_PKCS8_PRIV_KEY_INFO(NULL, &ptr, length)); |
| 362 | if (!pkcs8.get()) { |
| 363 | return ::SYSTEM_ERROR; |
| 364 | } |
| 365 | Unique_EVP_PKEY pkey(EVP_PKCS82PKEY(pkcs8.get())); |
| 366 | if (!pkey.get()) { |
| 367 | return ::SYSTEM_ERROR; |
| 368 | } |
| 369 | int type = EVP_PKEY_type(pkey->type); |
| 370 | KeymasterArguments params; |
| 371 | add_legacy_key_authorizations(type, ¶ms.params); |
| 372 | switch (type) { |
| 373 | case EVP_PKEY_RSA: |
| 374 | params.params.push_back(keymaster_param_enum(KM_TAG_ALGORITHM, KM_ALGORITHM_RSA)); |
| 375 | break; |
| 376 | case EVP_PKEY_EC: |
| 377 | params.params.push_back(keymaster_param_enum(KM_TAG_ALGORITHM, KM_ALGORITHM_EC)); |
| 378 | break; |
| 379 | default: |
| 380 | ALOGW("Unsupported key type %d", type); |
| 381 | return ::SYSTEM_ERROR; |
| 382 | } |
| 383 | int32_t rc = importKey(name, params, KM_KEY_FORMAT_PKCS8, data, length, targetUid, flags, |
| 384 | /*outCharacteristics*/ NULL); |
| 385 | if (rc != ::NO_ERROR) { |
| 386 | ALOGW("importKey failed: %d", rc); |
| 387 | } |
| 388 | return translateResultToLegacyResult(rc); |
| 389 | } |
| 390 | |
| 391 | int32_t KeyStoreService::sign(const String16& name, const uint8_t* data, size_t length, |
| 392 | uint8_t** out, size_t* outLength) { |
| 393 | if (!checkBinderPermission(P_SIGN)) { |
| 394 | return ::PERMISSION_DENIED; |
| 395 | } |
| 396 | return doLegacySignVerify(name, data, length, out, outLength, NULL, 0, KM_PURPOSE_SIGN); |
| 397 | } |
| 398 | |
| 399 | int32_t KeyStoreService::verify(const String16& name, const uint8_t* data, size_t dataLength, |
| 400 | const uint8_t* signature, size_t signatureLength) { |
| 401 | if (!checkBinderPermission(P_VERIFY)) { |
| 402 | return ::PERMISSION_DENIED; |
| 403 | } |
| 404 | return doLegacySignVerify(name, data, dataLength, NULL, NULL, signature, signatureLength, |
| 405 | KM_PURPOSE_VERIFY); |
| 406 | } |
| 407 | |
| 408 | /* |
| 409 | * TODO: The abstraction between things stored in hardware and regular blobs |
| 410 | * of data stored on the filesystem should be moved down to keystore itself. |
| 411 | * Unfortunately the Java code that calls this has naming conventions that it |
| 412 | * knows about. Ideally keystore shouldn't be used to store random blobs of |
| 413 | * data. |
| 414 | * |
| 415 | * Until that happens, it's necessary to have a separate "get_pubkey" and |
| 416 | * "del_key" since the Java code doesn't really communicate what it's |
| 417 | * intentions are. |
| 418 | */ |
| 419 | int32_t KeyStoreService::get_pubkey(const String16& name, uint8_t** pubkey, size_t* pubkeyLength) { |
| 420 | ExportResult result; |
| 421 | exportKey(name, KM_KEY_FORMAT_X509, NULL, NULL, UID_SELF, &result); |
| 422 | if (result.resultCode != ::NO_ERROR) { |
| 423 | ALOGW("export failed: %d", result.resultCode); |
| 424 | return translateResultToLegacyResult(result.resultCode); |
| 425 | } |
| 426 | |
| 427 | *pubkey = result.exportData.release(); |
| 428 | *pubkeyLength = result.dataLength; |
| 429 | return ::NO_ERROR; |
| 430 | } |
| 431 | |
| 432 | int32_t KeyStoreService::grant(const String16& name, int32_t granteeUid) { |
| 433 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
| 434 | int32_t result = checkBinderPermissionAndKeystoreState(P_GRANT); |
| 435 | if (result != ::NO_ERROR) { |
| 436 | return result; |
| 437 | } |
| 438 | |
| 439 | String8 name8(name); |
Tucker Sylvestro | 0ab28b7 | 2016-08-05 18:02:47 -0400 | [diff] [blame] | 440 | String8 filename(mKeyStore->getKeyNameForUidWithDir(name8, callingUid, ::TYPE_ANY)); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 441 | |
| 442 | if (access(filename.string(), R_OK) == -1) { |
| 443 | return (errno != ENOENT) ? ::SYSTEM_ERROR : ::KEY_NOT_FOUND; |
| 444 | } |
| 445 | |
| 446 | mKeyStore->addGrant(filename.string(), granteeUid); |
| 447 | return ::NO_ERROR; |
| 448 | } |
| 449 | |
| 450 | int32_t KeyStoreService::ungrant(const String16& name, int32_t granteeUid) { |
| 451 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
| 452 | int32_t result = checkBinderPermissionAndKeystoreState(P_GRANT); |
| 453 | if (result != ::NO_ERROR) { |
| 454 | return result; |
| 455 | } |
| 456 | |
| 457 | String8 name8(name); |
Tucker Sylvestro | 0ab28b7 | 2016-08-05 18:02:47 -0400 | [diff] [blame] | 458 | String8 filename(mKeyStore->getKeyNameForUidWithDir(name8, callingUid, ::TYPE_ANY)); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 459 | |
| 460 | if (access(filename.string(), R_OK) == -1) { |
| 461 | return (errno != ENOENT) ? ::SYSTEM_ERROR : ::KEY_NOT_FOUND; |
| 462 | } |
| 463 | |
| 464 | return mKeyStore->removeGrant(filename.string(), granteeUid) ? ::NO_ERROR : ::KEY_NOT_FOUND; |
| 465 | } |
| 466 | |
| 467 | int64_t KeyStoreService::getmtime(const String16& name, int32_t uid) { |
| 468 | uid_t targetUid = getEffectiveUid(uid); |
| 469 | if (!checkBinderPermission(P_GET, targetUid)) { |
| 470 | ALOGW("permission denied for %d: getmtime", targetUid); |
| 471 | return -1L; |
| 472 | } |
| 473 | |
| 474 | String8 name8(name); |
Tucker Sylvestro | 0ab28b7 | 2016-08-05 18:02:47 -0400 | [diff] [blame] | 475 | String8 filename(mKeyStore->getKeyNameForUidWithDir(name8, targetUid, ::TYPE_ANY)); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 476 | |
| 477 | if (access(filename.string(), R_OK) == -1) { |
| 478 | ALOGW("could not access %s for getmtime", filename.string()); |
| 479 | return -1L; |
| 480 | } |
| 481 | |
| 482 | int fd = TEMP_FAILURE_RETRY(open(filename.string(), O_NOFOLLOW, O_RDONLY)); |
| 483 | if (fd < 0) { |
| 484 | ALOGW("could not open %s for getmtime", filename.string()); |
| 485 | return -1L; |
| 486 | } |
| 487 | |
| 488 | struct stat s; |
| 489 | int ret = fstat(fd, &s); |
| 490 | close(fd); |
| 491 | if (ret == -1) { |
| 492 | ALOGW("could not stat %s for getmtime", filename.string()); |
| 493 | return -1L; |
| 494 | } |
| 495 | |
| 496 | return static_cast<int64_t>(s.st_mtime); |
| 497 | } |
| 498 | |
Tucker Sylvestro | 0ab28b7 | 2016-08-05 18:02:47 -0400 | [diff] [blame] | 499 | // TODO(tuckeris): This is dead code, remove it. Don't bother copying over key characteristics here |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 500 | int32_t KeyStoreService::duplicate(const String16& srcKey, int32_t srcUid, const String16& destKey, |
| 501 | int32_t destUid) { |
| 502 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
| 503 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
| 504 | if (!has_permission(callingUid, P_DUPLICATE, spid)) { |
| 505 | ALOGW("permission denied for %d: duplicate", callingUid); |
| 506 | return -1L; |
| 507 | } |
| 508 | |
| 509 | State state = mKeyStore->getState(get_user_id(callingUid)); |
| 510 | if (!isKeystoreUnlocked(state)) { |
| 511 | ALOGD("calling duplicate in state: %d", state); |
| 512 | return state; |
| 513 | } |
| 514 | |
| 515 | if (srcUid == -1 || static_cast<uid_t>(srcUid) == callingUid) { |
| 516 | srcUid = callingUid; |
| 517 | } else if (!is_granted_to(callingUid, srcUid)) { |
| 518 | ALOGD("migrate not granted from source: %d -> %d", callingUid, srcUid); |
| 519 | return ::PERMISSION_DENIED; |
| 520 | } |
| 521 | |
| 522 | if (destUid == -1) { |
| 523 | destUid = callingUid; |
| 524 | } |
| 525 | |
| 526 | if (srcUid != destUid) { |
| 527 | if (static_cast<uid_t>(srcUid) != callingUid) { |
| 528 | ALOGD("can only duplicate from caller to other or to same uid: " |
| 529 | "calling=%d, srcUid=%d, destUid=%d", |
| 530 | callingUid, srcUid, destUid); |
| 531 | return ::PERMISSION_DENIED; |
| 532 | } |
| 533 | |
| 534 | if (!is_granted_to(callingUid, destUid)) { |
| 535 | ALOGD("duplicate not granted to dest: %d -> %d", callingUid, destUid); |
| 536 | return ::PERMISSION_DENIED; |
| 537 | } |
| 538 | } |
| 539 | |
| 540 | String8 source8(srcKey); |
Tucker Sylvestro | 0ab28b7 | 2016-08-05 18:02:47 -0400 | [diff] [blame] | 541 | String8 sourceFile(mKeyStore->getKeyNameForUidWithDir(source8, srcUid, ::TYPE_ANY)); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 542 | |
| 543 | String8 target8(destKey); |
Tucker Sylvestro | 0ab28b7 | 2016-08-05 18:02:47 -0400 | [diff] [blame] | 544 | String8 targetFile(mKeyStore->getKeyNameForUidWithDir(target8, destUid, ::TYPE_ANY)); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 545 | |
| 546 | if (access(targetFile.string(), W_OK) != -1 || errno != ENOENT) { |
| 547 | ALOGD("destination already exists: %s", targetFile.string()); |
| 548 | return ::SYSTEM_ERROR; |
| 549 | } |
| 550 | |
| 551 | Blob keyBlob; |
| 552 | ResponseCode responseCode = |
| 553 | mKeyStore->get(sourceFile.string(), &keyBlob, TYPE_ANY, get_user_id(srcUid)); |
| 554 | if (responseCode != ::NO_ERROR) { |
| 555 | return responseCode; |
| 556 | } |
| 557 | |
| 558 | return mKeyStore->put(targetFile.string(), &keyBlob, get_user_id(destUid)); |
| 559 | } |
| 560 | |
| 561 | int32_t KeyStoreService::is_hardware_backed(const String16& keyType) { |
| 562 | return mKeyStore->isHardwareBacked(keyType) ? 1 : 0; |
| 563 | } |
| 564 | |
| 565 | int32_t KeyStoreService::clear_uid(int64_t targetUid64) { |
| 566 | uid_t targetUid = getEffectiveUid(targetUid64); |
| 567 | if (!checkBinderPermissionSelfOrSystem(P_CLEAR_UID, targetUid)) { |
| 568 | return ::PERMISSION_DENIED; |
| 569 | } |
| 570 | |
| 571 | String8 prefix = String8::format("%u_", targetUid); |
| 572 | Vector<String16> aliases; |
| 573 | if (mKeyStore->list(prefix, &aliases, get_user_id(targetUid)) != ::NO_ERROR) { |
| 574 | return ::SYSTEM_ERROR; |
| 575 | } |
| 576 | |
| 577 | for (uint32_t i = 0; i < aliases.size(); i++) { |
| 578 | String8 name8(aliases[i]); |
Tucker Sylvestro | 0ab28b7 | 2016-08-05 18:02:47 -0400 | [diff] [blame] | 579 | String8 filename(mKeyStore->getKeyNameForUidWithDir(name8, targetUid, ::TYPE_ANY)); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 580 | mKeyStore->del(filename.string(), ::TYPE_ANY, get_user_id(targetUid)); |
Tucker Sylvestro | 0ab28b7 | 2016-08-05 18:02:47 -0400 | [diff] [blame] | 581 | |
| 582 | // del() will fail silently if no cached characteristics are present for this alias. |
| 583 | String8 chr_filename(mKeyStore->getKeyNameForUidWithDir(name8, targetUid, |
| 584 | ::TYPE_KEY_CHARACTERISTICS)); |
| 585 | mKeyStore->del(chr_filename.string(), ::TYPE_KEY_CHARACTERISTICS, get_user_id(targetUid)); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 586 | } |
| 587 | return ::NO_ERROR; |
| 588 | } |
| 589 | |
| 590 | int32_t KeyStoreService::addRngEntropy(const uint8_t* data, size_t dataLength) { |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 591 | const auto* device = mKeyStore->getDevice(); |
| 592 | const auto* fallback = mKeyStore->getFallbackDevice(); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 593 | int32_t devResult = KM_ERROR_UNIMPLEMENTED; |
| 594 | int32_t fallbackResult = KM_ERROR_UNIMPLEMENTED; |
| 595 | if (device->common.module->module_api_version >= KEYMASTER_MODULE_API_VERSION_1_0 && |
| 596 | device->add_rng_entropy != NULL) { |
| 597 | devResult = device->add_rng_entropy(device, data, dataLength); |
| 598 | } |
| 599 | if (fallback->add_rng_entropy) { |
| 600 | fallbackResult = fallback->add_rng_entropy(fallback, data, dataLength); |
| 601 | } |
| 602 | if (devResult) { |
| 603 | return devResult; |
| 604 | } |
| 605 | if (fallbackResult) { |
| 606 | return fallbackResult; |
| 607 | } |
| 608 | return ::NO_ERROR; |
| 609 | } |
| 610 | |
| 611 | int32_t KeyStoreService::generateKey(const String16& name, const KeymasterArguments& params, |
| 612 | const uint8_t* entropy, size_t entropyLength, int uid, |
| 613 | int flags, KeyCharacteristics* outCharacteristics) { |
| 614 | uid = getEffectiveUid(uid); |
| 615 | int rc = checkBinderPermissionAndKeystoreState(P_INSERT, uid, flags & KEYSTORE_FLAG_ENCRYPTED); |
| 616 | if (rc != ::NO_ERROR) { |
| 617 | return rc; |
| 618 | } |
| 619 | |
| 620 | rc = KM_ERROR_UNIMPLEMENTED; |
| 621 | bool isFallback = false; |
| 622 | keymaster_key_blob_t blob; |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 623 | keymaster_key_characteristics_t out = {{nullptr, 0}, {nullptr, 0}}; |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 624 | |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 625 | const auto* device = mKeyStore->getDevice(); |
| 626 | const auto* fallback = mKeyStore->getFallbackDevice(); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 627 | std::vector<keymaster_key_param_t> opParams(params.params); |
| 628 | const keymaster_key_param_set_t inParams = {opParams.data(), opParams.size()}; |
| 629 | if (device == NULL) { |
| 630 | return ::SYSTEM_ERROR; |
| 631 | } |
Tucker Sylvestro | 0ab28b7 | 2016-08-05 18:02:47 -0400 | [diff] [blame] | 632 | |
| 633 | // Capture characteristics before they're potentially stripped by the device |
| 634 | AuthorizationSet keyCharacteristics(opParams.data(), opParams.size()); |
| 635 | if (keyCharacteristics.is_valid() != AuthorizationSet::Error::OK) { |
| 636 | return KM_ERROR_MEMORY_ALLOCATION_FAILED; |
| 637 | } |
| 638 | UniquePtr<uint8_t[]> kc_buf; |
| 639 | kc_buf.reset(new (std::nothrow) uint8_t[keyCharacteristics.SerializedSize()]); |
| 640 | if (!kc_buf.get()) { |
| 641 | return KM_ERROR_MEMORY_ALLOCATION_FAILED; |
| 642 | } |
| 643 | keyCharacteristics.Serialize(kc_buf.get(), kc_buf.get() + keyCharacteristics.SerializedSize()); |
| 644 | |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 645 | // TODO: Seed from Linux RNG before this. |
| 646 | if (device->common.module->module_api_version >= KEYMASTER_MODULE_API_VERSION_1_0 && |
| 647 | device->generate_key != NULL) { |
| 648 | if (!entropy) { |
| 649 | rc = KM_ERROR_OK; |
| 650 | } else if (device->add_rng_entropy) { |
| 651 | rc = device->add_rng_entropy(device, entropy, entropyLength); |
| 652 | } else { |
| 653 | rc = KM_ERROR_UNIMPLEMENTED; |
| 654 | } |
| 655 | if (rc == KM_ERROR_OK) { |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 656 | rc = |
| 657 | device->generate_key(device, &inParams, &blob, outCharacteristics ? &out : nullptr); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 658 | } |
| 659 | } |
| 660 | // If the HW device didn't support generate_key or generate_key failed |
| 661 | // fall back to the software implementation. |
| 662 | if (rc && fallback->generate_key != NULL) { |
| 663 | ALOGW("Primary keymaster device failed to generate key, falling back to SW."); |
| 664 | isFallback = true; |
| 665 | if (!entropy) { |
| 666 | rc = KM_ERROR_OK; |
| 667 | } else if (fallback->add_rng_entropy) { |
| 668 | rc = fallback->add_rng_entropy(fallback, entropy, entropyLength); |
| 669 | } else { |
| 670 | rc = KM_ERROR_UNIMPLEMENTED; |
| 671 | } |
| 672 | if (rc == KM_ERROR_OK) { |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 673 | rc = fallback->generate_key(fallback, &inParams, &blob, |
| 674 | outCharacteristics ? &out : nullptr); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 675 | } |
| 676 | } |
| 677 | |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 678 | if (outCharacteristics) { |
| 679 | outCharacteristics->characteristics = out; |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 680 | } |
| 681 | |
| 682 | if (rc) { |
| 683 | return rc; |
| 684 | } |
| 685 | |
Tucker Sylvestro | 0ab28b7 | 2016-08-05 18:02:47 -0400 | [diff] [blame] | 686 | // Write the key: |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 687 | String8 name8(name); |
Tucker Sylvestro | 0ab28b7 | 2016-08-05 18:02:47 -0400 | [diff] [blame] | 688 | String8 filename(mKeyStore->getKeyNameForUidWithDir(name8, uid, ::TYPE_KEYMASTER_10)); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 689 | |
| 690 | Blob keyBlob(blob.key_material, blob.key_material_size, NULL, 0, ::TYPE_KEYMASTER_10); |
| 691 | keyBlob.setFallback(isFallback); |
| 692 | keyBlob.setEncrypted(flags & KEYSTORE_FLAG_ENCRYPTED); |
| 693 | |
| 694 | free(const_cast<uint8_t*>(blob.key_material)); |
Tucker Sylvestro | 0ab28b7 | 2016-08-05 18:02:47 -0400 | [diff] [blame] | 695 | rc = mKeyStore->put(filename.string(), &keyBlob, get_user_id(uid)); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 696 | |
Tucker Sylvestro | 0ab28b7 | 2016-08-05 18:02:47 -0400 | [diff] [blame] | 697 | if (rc != ::NO_ERROR) { |
| 698 | return rc; |
| 699 | } |
| 700 | |
| 701 | // Write the characteristics: |
| 702 | String8 cFilename(mKeyStore->getKeyNameForUidWithDir(name8, uid, ::TYPE_KEY_CHARACTERISTICS)); |
| 703 | |
| 704 | Blob charBlob(kc_buf.get(), keyCharacteristics.SerializedSize(), |
| 705 | NULL, 0, ::TYPE_KEY_CHARACTERISTICS); |
| 706 | charBlob.setFallback(isFallback); |
| 707 | charBlob.setEncrypted(flags & KEYSTORE_FLAG_ENCRYPTED); |
| 708 | |
| 709 | return mKeyStore->put(cFilename.string(), &charBlob, get_user_id(uid)); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 710 | } |
| 711 | |
| 712 | int32_t KeyStoreService::getKeyCharacteristics(const String16& name, |
| 713 | const keymaster_blob_t* clientId, |
| 714 | const keymaster_blob_t* appData, int32_t uid, |
| 715 | KeyCharacteristics* outCharacteristics) { |
| 716 | if (!outCharacteristics) { |
| 717 | return KM_ERROR_UNEXPECTED_NULL_POINTER; |
| 718 | } |
| 719 | |
| 720 | uid_t targetUid = getEffectiveUid(uid); |
| 721 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
| 722 | if (!is_granted_to(callingUid, targetUid)) { |
| 723 | ALOGW("uid %d not permitted to act for uid %d in getKeyCharacteristics", callingUid, |
| 724 | targetUid); |
| 725 | return ::PERMISSION_DENIED; |
| 726 | } |
| 727 | |
| 728 | Blob keyBlob; |
| 729 | String8 name8(name); |
| 730 | int rc; |
| 731 | |
| 732 | ResponseCode responseCode = |
| 733 | mKeyStore->getKeyForName(&keyBlob, name8, targetUid, TYPE_KEYMASTER_10); |
| 734 | if (responseCode != ::NO_ERROR) { |
| 735 | return responseCode; |
| 736 | } |
Shawn Willden | 98c5916 | 2016-03-20 09:10:18 -0600 | [diff] [blame] | 737 | keymaster_key_blob_t key = {keyBlob.getValue(), static_cast<size_t>(keyBlob.getLength())}; |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 738 | auto* dev = mKeyStore->getDeviceForBlob(keyBlob); |
Shawn Willden | 98c5916 | 2016-03-20 09:10:18 -0600 | [diff] [blame] | 739 | keymaster_key_characteristics_t out = {}; |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 740 | if (!dev->get_key_characteristics) { |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 741 | ALOGE("device does not implement get_key_characteristics"); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 742 | return KM_ERROR_UNIMPLEMENTED; |
| 743 | } |
| 744 | rc = dev->get_key_characteristics(dev, &key, clientId, appData, &out); |
Shawn Willden | 98c5916 | 2016-03-20 09:10:18 -0600 | [diff] [blame] | 745 | if (rc == KM_ERROR_KEY_REQUIRES_UPGRADE) { |
| 746 | AuthorizationSet upgradeParams; |
| 747 | if (clientId && clientId->data && clientId->data_length) { |
| 748 | upgradeParams.push_back(TAG_APPLICATION_ID, *clientId); |
| 749 | } |
| 750 | if (appData && appData->data && appData->data_length) { |
| 751 | upgradeParams.push_back(TAG_APPLICATION_DATA, *appData); |
| 752 | } |
| 753 | rc = upgradeKeyBlob(name, targetUid, upgradeParams, &keyBlob); |
| 754 | if (rc != ::NO_ERROR) { |
| 755 | return rc; |
| 756 | } |
| 757 | key = {keyBlob.getValue(), static_cast<size_t>(keyBlob.getLength())}; |
| 758 | rc = dev->get_key_characteristics(dev, &key, clientId, appData, &out); |
| 759 | } |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 760 | if (rc != KM_ERROR_OK) { |
| 761 | return rc; |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 762 | } |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 763 | |
| 764 | outCharacteristics->characteristics = out; |
| 765 | return ::NO_ERROR; |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 766 | } |
| 767 | |
| 768 | int32_t KeyStoreService::importKey(const String16& name, const KeymasterArguments& params, |
| 769 | keymaster_key_format_t format, const uint8_t* keyData, |
| 770 | size_t keyLength, int uid, int flags, |
| 771 | KeyCharacteristics* outCharacteristics) { |
| 772 | uid = getEffectiveUid(uid); |
| 773 | int rc = checkBinderPermissionAndKeystoreState(P_INSERT, uid, flags & KEYSTORE_FLAG_ENCRYPTED); |
| 774 | if (rc != ::NO_ERROR) { |
| 775 | return rc; |
| 776 | } |
| 777 | |
| 778 | rc = KM_ERROR_UNIMPLEMENTED; |
| 779 | bool isFallback = false; |
| 780 | keymaster_key_blob_t blob; |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 781 | keymaster_key_characteristics_t out = {{nullptr, 0}, {nullptr, 0}}; |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 782 | |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 783 | const auto* device = mKeyStore->getDevice(); |
| 784 | const auto* fallback = mKeyStore->getFallbackDevice(); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 785 | std::vector<keymaster_key_param_t> opParams(params.params); |
| 786 | const keymaster_key_param_set_t inParams = {opParams.data(), opParams.size()}; |
| 787 | const keymaster_blob_t input = {keyData, keyLength}; |
| 788 | if (device == NULL) { |
| 789 | return ::SYSTEM_ERROR; |
| 790 | } |
Tucker Sylvestro | 0ab28b7 | 2016-08-05 18:02:47 -0400 | [diff] [blame] | 791 | |
| 792 | // Capture characteristics before they're potentially stripped |
| 793 | AuthorizationSet keyCharacteristics(opParams.data(), opParams.size()); |
| 794 | if (keyCharacteristics.is_valid() != AuthorizationSet::Error::OK) { |
| 795 | return KM_ERROR_MEMORY_ALLOCATION_FAILED; |
| 796 | } |
| 797 | UniquePtr<uint8_t[]> kc_buf; |
| 798 | kc_buf.reset(new (std::nothrow) uint8_t[keyCharacteristics.SerializedSize()]); |
| 799 | if (!kc_buf.get()) { |
| 800 | return KM_ERROR_MEMORY_ALLOCATION_FAILED; |
| 801 | } |
| 802 | keyCharacteristics.Serialize(kc_buf.get(), kc_buf.get() + keyCharacteristics.SerializedSize()); |
| 803 | |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 804 | if (device->common.module->module_api_version >= KEYMASTER_MODULE_API_VERSION_1_0 && |
| 805 | device->import_key != NULL) { |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 806 | rc = device->import_key(device, &inParams, format, &input, &blob, |
| 807 | outCharacteristics ? &out : nullptr); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 808 | } |
| 809 | if (rc && fallback->import_key != NULL) { |
| 810 | ALOGW("Primary keymaster device failed to import key, falling back to SW."); |
| 811 | isFallback = true; |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 812 | rc = fallback->import_key(fallback, &inParams, format, &input, &blob, |
| 813 | outCharacteristics ? &out : nullptr); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 814 | } |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 815 | if (outCharacteristics) { |
| 816 | outCharacteristics->characteristics = out; |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 817 | } |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 818 | |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 819 | if (rc) { |
| 820 | return rc; |
| 821 | } |
| 822 | |
Tucker Sylvestro | 0ab28b7 | 2016-08-05 18:02:47 -0400 | [diff] [blame] | 823 | // Write the key: |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 824 | String8 name8(name); |
Tucker Sylvestro | 0ab28b7 | 2016-08-05 18:02:47 -0400 | [diff] [blame] | 825 | String8 filename(mKeyStore->getKeyNameForUidWithDir(name8, uid, ::TYPE_KEYMASTER_10)); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 826 | |
| 827 | Blob keyBlob(blob.key_material, blob.key_material_size, NULL, 0, ::TYPE_KEYMASTER_10); |
| 828 | keyBlob.setFallback(isFallback); |
| 829 | keyBlob.setEncrypted(flags & KEYSTORE_FLAG_ENCRYPTED); |
| 830 | |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 831 | free(const_cast<uint8_t*>(blob.key_material)); |
Tucker Sylvestro | 0ab28b7 | 2016-08-05 18:02:47 -0400 | [diff] [blame] | 832 | rc = mKeyStore->put(filename.string(), &keyBlob, get_user_id(uid)); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 833 | |
Tucker Sylvestro | 0ab28b7 | 2016-08-05 18:02:47 -0400 | [diff] [blame] | 834 | if (rc != ::NO_ERROR) { |
| 835 | return rc; |
| 836 | } |
| 837 | |
| 838 | // Write the characteristics: |
| 839 | String8 cFilename(mKeyStore->getKeyNameForUidWithDir(name8, uid, ::TYPE_KEY_CHARACTERISTICS)); |
| 840 | |
| 841 | Blob charBlob(kc_buf.get(), keyCharacteristics.SerializedSize(), |
| 842 | NULL, 0, ::TYPE_KEY_CHARACTERISTICS); |
| 843 | charBlob.setFallback(isFallback); |
| 844 | charBlob.setEncrypted(flags & KEYSTORE_FLAG_ENCRYPTED); |
| 845 | |
| 846 | return mKeyStore->put(cFilename.string(), &charBlob, get_user_id(uid)); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 847 | } |
| 848 | |
| 849 | void KeyStoreService::exportKey(const String16& name, keymaster_key_format_t format, |
| 850 | const keymaster_blob_t* clientId, const keymaster_blob_t* appData, |
| 851 | int32_t uid, ExportResult* result) { |
| 852 | |
| 853 | uid_t targetUid = getEffectiveUid(uid); |
| 854 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
| 855 | if (!is_granted_to(callingUid, targetUid)) { |
| 856 | ALOGW("uid %d not permitted to act for uid %d in exportKey", callingUid, targetUid); |
| 857 | result->resultCode = ::PERMISSION_DENIED; |
| 858 | return; |
| 859 | } |
| 860 | |
| 861 | Blob keyBlob; |
| 862 | String8 name8(name); |
| 863 | int rc; |
| 864 | |
| 865 | ResponseCode responseCode = |
| 866 | mKeyStore->getKeyForName(&keyBlob, name8, targetUid, TYPE_KEYMASTER_10); |
| 867 | if (responseCode != ::NO_ERROR) { |
| 868 | result->resultCode = responseCode; |
| 869 | return; |
| 870 | } |
| 871 | keymaster_key_blob_t key; |
| 872 | key.key_material_size = keyBlob.getLength(); |
| 873 | key.key_material = keyBlob.getValue(); |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 874 | auto* dev = mKeyStore->getDeviceForBlob(keyBlob); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 875 | if (!dev->export_key) { |
| 876 | result->resultCode = KM_ERROR_UNIMPLEMENTED; |
| 877 | return; |
| 878 | } |
| 879 | keymaster_blob_t output = {NULL, 0}; |
| 880 | rc = dev->export_key(dev, format, &key, clientId, appData, &output); |
Ji Wang | 2c14231 | 2016-10-14 17:21:10 +0800 | [diff] [blame] | 881 | if (rc == KM_ERROR_KEY_REQUIRES_UPGRADE) { |
| 882 | AuthorizationSet upgradeParams; |
| 883 | if (clientId && clientId->data && clientId->data_length) { |
| 884 | upgradeParams.push_back(TAG_APPLICATION_ID, *clientId); |
| 885 | } |
| 886 | if (appData && appData->data && appData->data_length) { |
| 887 | upgradeParams.push_back(TAG_APPLICATION_DATA, *appData); |
| 888 | } |
| 889 | rc = upgradeKeyBlob(name, targetUid, upgradeParams, &keyBlob); |
| 890 | if (rc != ::NO_ERROR) { |
| 891 | result->resultCode = rc; |
| 892 | return; |
| 893 | } |
| 894 | key = {keyBlob.getValue(), static_cast<size_t>(keyBlob.getLength())}; |
| 895 | rc = dev->export_key(dev, format, &key, clientId, appData, &output); |
| 896 | } |
| 897 | |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 898 | result->exportData.reset(const_cast<uint8_t*>(output.data)); |
| 899 | result->dataLength = output.data_length; |
| 900 | result->resultCode = rc ? rc : ::NO_ERROR; |
| 901 | } |
| 902 | |
| 903 | void KeyStoreService::begin(const sp<IBinder>& appToken, const String16& name, |
| 904 | keymaster_purpose_t purpose, bool pruneable, |
| 905 | const KeymasterArguments& params, const uint8_t* entropy, |
| 906 | size_t entropyLength, int32_t uid, OperationResult* result) { |
| 907 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
| 908 | uid_t targetUid = getEffectiveUid(uid); |
| 909 | if (!is_granted_to(callingUid, targetUid)) { |
| 910 | ALOGW("uid %d not permitted to act for uid %d in begin", callingUid, targetUid); |
| 911 | result->resultCode = ::PERMISSION_DENIED; |
| 912 | return; |
| 913 | } |
| 914 | if (!pruneable && get_app_id(callingUid) != AID_SYSTEM) { |
| 915 | ALOGE("Non-system uid %d trying to start non-pruneable operation", callingUid); |
| 916 | result->resultCode = ::PERMISSION_DENIED; |
| 917 | return; |
| 918 | } |
| 919 | if (!checkAllowedOperationParams(params.params)) { |
| 920 | result->resultCode = KM_ERROR_INVALID_ARGUMENT; |
| 921 | return; |
| 922 | } |
| 923 | Blob keyBlob; |
| 924 | String8 name8(name); |
| 925 | ResponseCode responseCode = |
| 926 | mKeyStore->getKeyForName(&keyBlob, name8, targetUid, TYPE_KEYMASTER_10); |
| 927 | if (responseCode != ::NO_ERROR) { |
| 928 | result->resultCode = responseCode; |
| 929 | return; |
| 930 | } |
| 931 | keymaster_key_blob_t key; |
| 932 | key.key_material_size = keyBlob.getLength(); |
| 933 | key.key_material = keyBlob.getValue(); |
| 934 | keymaster_operation_handle_t handle; |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 935 | auto* dev = mKeyStore->getDeviceForBlob(keyBlob); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 936 | keymaster_error_t err = KM_ERROR_UNIMPLEMENTED; |
| 937 | std::vector<keymaster_key_param_t> opParams(params.params); |
| 938 | Unique_keymaster_key_characteristics characteristics; |
| 939 | characteristics.reset(new keymaster_key_characteristics_t); |
| 940 | err = getOperationCharacteristics(key, dev, opParams, characteristics.get()); |
Shawn Willden | 98c5916 | 2016-03-20 09:10:18 -0600 | [diff] [blame] | 941 | if (err == KM_ERROR_KEY_REQUIRES_UPGRADE) { |
| 942 | int32_t rc = upgradeKeyBlob(name, targetUid, |
| 943 | AuthorizationSet(opParams.data(), opParams.size()), &keyBlob); |
| 944 | if (rc != ::NO_ERROR) { |
| 945 | result->resultCode = rc; |
| 946 | return; |
| 947 | } |
| 948 | key = {keyBlob.getValue(), static_cast<size_t>(keyBlob.getLength())}; |
| 949 | err = getOperationCharacteristics(key, dev, opParams, characteristics.get()); |
| 950 | } |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 951 | if (err) { |
| 952 | result->resultCode = err; |
| 953 | return; |
| 954 | } |
| 955 | const hw_auth_token_t* authToken = NULL; |
Tucker Sylvestro | 0ab28b7 | 2016-08-05 18:02:47 -0400 | [diff] [blame] | 956 | |
| 957 | // Merge these characteristics with the ones cached when the key was generated or imported |
| 958 | Blob charBlob; |
| 959 | AuthorizationSet persistedCharacteristics; |
| 960 | responseCode = mKeyStore->getKeyForName(&charBlob, name8, targetUid, TYPE_KEY_CHARACTERISTICS); |
| 961 | if (responseCode == ::NO_ERROR) { |
| 962 | const uint8_t* serializedCharacteristics = charBlob.getValue(); |
| 963 | persistedCharacteristics.Deserialize(&serializedCharacteristics, |
| 964 | serializedCharacteristics + charBlob.getLength()); |
| 965 | } else { |
| 966 | ALOGD("Unable to read cached characteristics for key"); |
| 967 | } |
| 968 | |
| 969 | // Replace the sw_enforced set with those persisted to disk, minus hw_enforced |
| 970 | persistedCharacteristics.Union(characteristics.get()->sw_enforced); |
| 971 | persistedCharacteristics.Difference(characteristics.get()->hw_enforced); |
| 972 | persistedCharacteristics.CopyToParamSet(&characteristics.get()->sw_enforced); |
| 973 | |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 974 | int32_t authResult = getAuthToken(characteristics.get(), 0, purpose, &authToken, |
| 975 | /*failOnTokenMissing*/ false); |
| 976 | // If per-operation auth is needed we need to begin the operation and |
| 977 | // the client will need to authorize that operation before calling |
| 978 | // update. Any other auth issues stop here. |
| 979 | if (authResult != ::NO_ERROR && authResult != ::OP_AUTH_NEEDED) { |
| 980 | result->resultCode = authResult; |
| 981 | return; |
| 982 | } |
| 983 | addAuthToParams(&opParams, authToken); |
| 984 | // Add entropy to the device first. |
| 985 | if (entropy) { |
| 986 | if (dev->add_rng_entropy) { |
| 987 | err = dev->add_rng_entropy(dev, entropy, entropyLength); |
| 988 | } else { |
| 989 | err = KM_ERROR_UNIMPLEMENTED; |
| 990 | } |
| 991 | if (err) { |
| 992 | result->resultCode = err; |
| 993 | return; |
| 994 | } |
| 995 | } |
| 996 | keymaster_key_param_set_t inParams = {opParams.data(), opParams.size()}; |
| 997 | |
| 998 | // Create a keyid for this key. |
| 999 | keymaster::km_id_t keyid; |
| 1000 | if (!enforcement_policy.CreateKeyId(key, &keyid)) { |
| 1001 | ALOGE("Failed to create a key ID for authorization checking."); |
| 1002 | result->resultCode = KM_ERROR_UNKNOWN_ERROR; |
| 1003 | return; |
| 1004 | } |
| 1005 | |
| 1006 | // Check that all key authorization policy requirements are met. |
| 1007 | keymaster::AuthorizationSet key_auths(characteristics->hw_enforced); |
| 1008 | key_auths.push_back(characteristics->sw_enforced); |
| 1009 | keymaster::AuthorizationSet operation_params(inParams); |
| 1010 | err = enforcement_policy.AuthorizeOperation(purpose, keyid, key_auths, operation_params, |
| 1011 | 0 /* op_handle */, true /* is_begin_operation */); |
| 1012 | if (err) { |
| 1013 | result->resultCode = err; |
| 1014 | return; |
| 1015 | } |
| 1016 | |
| 1017 | keymaster_key_param_set_t outParams = {NULL, 0}; |
| 1018 | |
| 1019 | // If there are more than MAX_OPERATIONS, abort the oldest operation that was started as |
| 1020 | // pruneable. |
| 1021 | while (mOperationMap.getOperationCount() >= MAX_OPERATIONS) { |
| 1022 | ALOGD("Reached or exceeded concurrent operations limit"); |
| 1023 | if (!pruneOperation()) { |
| 1024 | break; |
| 1025 | } |
| 1026 | } |
| 1027 | |
| 1028 | err = dev->begin(dev, purpose, &key, &inParams, &outParams, &handle); |
| 1029 | if (err != KM_ERROR_OK) { |
| 1030 | ALOGE("Got error %d from begin()", err); |
| 1031 | } |
| 1032 | |
| 1033 | // If there are too many operations abort the oldest operation that was |
| 1034 | // started as pruneable and try again. |
| 1035 | while (err == KM_ERROR_TOO_MANY_OPERATIONS && mOperationMap.hasPruneableOperation()) { |
| 1036 | ALOGE("Ran out of operation handles"); |
| 1037 | if (!pruneOperation()) { |
| 1038 | break; |
| 1039 | } |
| 1040 | err = dev->begin(dev, purpose, &key, &inParams, &outParams, &handle); |
| 1041 | } |
| 1042 | if (err) { |
| 1043 | result->resultCode = err; |
| 1044 | return; |
| 1045 | } |
| 1046 | |
| 1047 | sp<IBinder> operationToken = mOperationMap.addOperation(handle, keyid, purpose, dev, appToken, |
| 1048 | characteristics.release(), pruneable); |
| 1049 | if (authToken) { |
| 1050 | mOperationMap.setOperationAuthToken(operationToken, authToken); |
| 1051 | } |
| 1052 | // Return the authentication lookup result. If this is a per operation |
| 1053 | // auth'd key then the resultCode will be ::OP_AUTH_NEEDED and the |
| 1054 | // application should get an auth token using the handle before the |
| 1055 | // first call to update, which will fail if keystore hasn't received the |
| 1056 | // auth token. |
| 1057 | result->resultCode = authResult; |
| 1058 | result->token = operationToken; |
| 1059 | result->handle = handle; |
| 1060 | if (outParams.params) { |
| 1061 | result->outParams.params.assign(outParams.params, outParams.params + outParams.length); |
| 1062 | free(outParams.params); |
| 1063 | } |
| 1064 | } |
| 1065 | |
| 1066 | void KeyStoreService::update(const sp<IBinder>& token, const KeymasterArguments& params, |
| 1067 | const uint8_t* data, size_t dataLength, OperationResult* result) { |
| 1068 | if (!checkAllowedOperationParams(params.params)) { |
| 1069 | result->resultCode = KM_ERROR_INVALID_ARGUMENT; |
| 1070 | return; |
| 1071 | } |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 1072 | const keymaster2_device_t* dev; |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 1073 | keymaster_operation_handle_t handle; |
| 1074 | keymaster_purpose_t purpose; |
| 1075 | keymaster::km_id_t keyid; |
| 1076 | const keymaster_key_characteristics_t* characteristics; |
| 1077 | if (!mOperationMap.getOperation(token, &handle, &keyid, &purpose, &dev, &characteristics)) { |
| 1078 | result->resultCode = KM_ERROR_INVALID_OPERATION_HANDLE; |
| 1079 | return; |
| 1080 | } |
| 1081 | std::vector<keymaster_key_param_t> opParams(params.params); |
| 1082 | int32_t authResult = addOperationAuthTokenIfNeeded(token, &opParams); |
| 1083 | if (authResult != ::NO_ERROR) { |
| 1084 | result->resultCode = authResult; |
| 1085 | return; |
| 1086 | } |
| 1087 | keymaster_key_param_set_t inParams = {opParams.data(), opParams.size()}; |
| 1088 | keymaster_blob_t input = {data, dataLength}; |
| 1089 | size_t consumed = 0; |
| 1090 | keymaster_blob_t output = {NULL, 0}; |
| 1091 | keymaster_key_param_set_t outParams = {NULL, 0}; |
| 1092 | |
| 1093 | // Check that all key authorization policy requirements are met. |
| 1094 | keymaster::AuthorizationSet key_auths(characteristics->hw_enforced); |
| 1095 | key_auths.push_back(characteristics->sw_enforced); |
| 1096 | keymaster::AuthorizationSet operation_params(inParams); |
| 1097 | result->resultCode = enforcement_policy.AuthorizeOperation( |
| 1098 | purpose, keyid, key_auths, operation_params, handle, false /* is_begin_operation */); |
| 1099 | if (result->resultCode) { |
| 1100 | return; |
| 1101 | } |
| 1102 | |
| 1103 | keymaster_error_t err = |
| 1104 | dev->update(dev, handle, &inParams, &input, &consumed, &outParams, &output); |
| 1105 | result->data.reset(const_cast<uint8_t*>(output.data)); |
| 1106 | result->dataLength = output.data_length; |
| 1107 | result->inputConsumed = consumed; |
| 1108 | result->resultCode = err ? (int32_t)err : ::NO_ERROR; |
| 1109 | if (outParams.params) { |
| 1110 | result->outParams.params.assign(outParams.params, outParams.params + outParams.length); |
| 1111 | free(outParams.params); |
| 1112 | } |
| 1113 | } |
| 1114 | |
| 1115 | void KeyStoreService::finish(const sp<IBinder>& token, const KeymasterArguments& params, |
| 1116 | const uint8_t* signature, size_t signatureLength, |
| 1117 | const uint8_t* entropy, size_t entropyLength, |
| 1118 | OperationResult* result) { |
| 1119 | if (!checkAllowedOperationParams(params.params)) { |
| 1120 | result->resultCode = KM_ERROR_INVALID_ARGUMENT; |
| 1121 | return; |
| 1122 | } |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 1123 | const keymaster2_device_t* dev; |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 1124 | keymaster_operation_handle_t handle; |
| 1125 | keymaster_purpose_t purpose; |
| 1126 | keymaster::km_id_t keyid; |
| 1127 | const keymaster_key_characteristics_t* characteristics; |
| 1128 | if (!mOperationMap.getOperation(token, &handle, &keyid, &purpose, &dev, &characteristics)) { |
| 1129 | result->resultCode = KM_ERROR_INVALID_OPERATION_HANDLE; |
| 1130 | return; |
| 1131 | } |
| 1132 | std::vector<keymaster_key_param_t> opParams(params.params); |
| 1133 | int32_t authResult = addOperationAuthTokenIfNeeded(token, &opParams); |
| 1134 | if (authResult != ::NO_ERROR) { |
| 1135 | result->resultCode = authResult; |
| 1136 | return; |
| 1137 | } |
| 1138 | keymaster_error_t err; |
| 1139 | if (entropy) { |
| 1140 | if (dev->add_rng_entropy) { |
| 1141 | err = dev->add_rng_entropy(dev, entropy, entropyLength); |
| 1142 | } else { |
| 1143 | err = KM_ERROR_UNIMPLEMENTED; |
| 1144 | } |
| 1145 | if (err) { |
| 1146 | result->resultCode = err; |
| 1147 | return; |
| 1148 | } |
| 1149 | } |
| 1150 | |
| 1151 | keymaster_key_param_set_t inParams = {opParams.data(), opParams.size()}; |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 1152 | keymaster_blob_t input = {nullptr, 0}; |
| 1153 | keymaster_blob_t sig = {signature, signatureLength}; |
| 1154 | keymaster_blob_t output = {nullptr, 0}; |
| 1155 | keymaster_key_param_set_t outParams = {nullptr, 0}; |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 1156 | |
| 1157 | // Check that all key authorization policy requirements are met. |
| 1158 | keymaster::AuthorizationSet key_auths(characteristics->hw_enforced); |
| 1159 | key_auths.push_back(characteristics->sw_enforced); |
| 1160 | keymaster::AuthorizationSet operation_params(inParams); |
| 1161 | err = enforcement_policy.AuthorizeOperation(purpose, keyid, key_auths, operation_params, handle, |
| 1162 | false /* is_begin_operation */); |
| 1163 | if (err) { |
| 1164 | result->resultCode = err; |
| 1165 | return; |
| 1166 | } |
| 1167 | |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 1168 | err = |
| 1169 | dev->finish(dev, handle, &inParams, &input /* TODO(swillden): wire up input to finish() */, |
| 1170 | &sig, &outParams, &output); |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 1171 | // Remove the operation regardless of the result |
| 1172 | mOperationMap.removeOperation(token); |
| 1173 | mAuthTokenTable.MarkCompleted(handle); |
| 1174 | |
| 1175 | result->data.reset(const_cast<uint8_t*>(output.data)); |
| 1176 | result->dataLength = output.data_length; |
| 1177 | result->resultCode = err ? (int32_t)err : ::NO_ERROR; |
| 1178 | if (outParams.params) { |
| 1179 | result->outParams.params.assign(outParams.params, outParams.params + outParams.length); |
| 1180 | free(outParams.params); |
| 1181 | } |
| 1182 | } |
| 1183 | |
| 1184 | int32_t KeyStoreService::abort(const sp<IBinder>& token) { |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 1185 | const keymaster2_device_t* dev; |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 1186 | keymaster_operation_handle_t handle; |
| 1187 | keymaster_purpose_t purpose; |
| 1188 | keymaster::km_id_t keyid; |
| 1189 | if (!mOperationMap.getOperation(token, &handle, &keyid, &purpose, &dev, NULL)) { |
| 1190 | return KM_ERROR_INVALID_OPERATION_HANDLE; |
| 1191 | } |
| 1192 | mOperationMap.removeOperation(token); |
| 1193 | int32_t rc; |
| 1194 | if (!dev->abort) { |
| 1195 | rc = KM_ERROR_UNIMPLEMENTED; |
| 1196 | } else { |
| 1197 | rc = dev->abort(dev, handle); |
| 1198 | } |
| 1199 | mAuthTokenTable.MarkCompleted(handle); |
| 1200 | if (rc) { |
| 1201 | return rc; |
| 1202 | } |
| 1203 | return ::NO_ERROR; |
| 1204 | } |
| 1205 | |
| 1206 | bool KeyStoreService::isOperationAuthorized(const sp<IBinder>& token) { |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 1207 | const keymaster2_device_t* dev; |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 1208 | keymaster_operation_handle_t handle; |
| 1209 | const keymaster_key_characteristics_t* characteristics; |
| 1210 | keymaster_purpose_t purpose; |
| 1211 | keymaster::km_id_t keyid; |
| 1212 | if (!mOperationMap.getOperation(token, &handle, &keyid, &purpose, &dev, &characteristics)) { |
| 1213 | return false; |
| 1214 | } |
| 1215 | const hw_auth_token_t* authToken = NULL; |
| 1216 | mOperationMap.getOperationAuthToken(token, &authToken); |
| 1217 | std::vector<keymaster_key_param_t> ignored; |
| 1218 | int32_t authResult = addOperationAuthTokenIfNeeded(token, &ignored); |
| 1219 | return authResult == ::NO_ERROR; |
| 1220 | } |
| 1221 | |
| 1222 | int32_t KeyStoreService::addAuthToken(const uint8_t* token, size_t length) { |
| 1223 | if (!checkBinderPermission(P_ADD_AUTH)) { |
| 1224 | ALOGW("addAuthToken: permission denied for %d", IPCThreadState::self()->getCallingUid()); |
| 1225 | return ::PERMISSION_DENIED; |
| 1226 | } |
| 1227 | if (length != sizeof(hw_auth_token_t)) { |
| 1228 | return KM_ERROR_INVALID_ARGUMENT; |
| 1229 | } |
| 1230 | hw_auth_token_t* authToken = new hw_auth_token_t; |
| 1231 | memcpy(reinterpret_cast<void*>(authToken), token, sizeof(hw_auth_token_t)); |
| 1232 | // The table takes ownership of authToken. |
| 1233 | mAuthTokenTable.AddAuthenticationToken(authToken); |
| 1234 | return ::NO_ERROR; |
| 1235 | } |
| 1236 | |
Janis Danisevskis | 7612fd4 | 2016-09-01 11:50:02 +0100 | [diff] [blame] | 1237 | constexpr size_t KEY_ATTESTATION_APPLICATION_ID_MAX_SIZE = 1024; |
| 1238 | |
Shawn Willden | 50eb1b2 | 2016-01-21 12:41:23 -0700 | [diff] [blame] | 1239 | int32_t KeyStoreService::attestKey(const String16& name, const KeymasterArguments& params, |
| 1240 | KeymasterCertificateChain* outChain) { |
Janis Danisevskis | 18f27ad | 2016-06-01 13:57:40 -0700 | [diff] [blame] | 1241 | if (!outChain) return KM_ERROR_OUTPUT_PARAMETER_NULL; |
Shawn Willden | 50eb1b2 | 2016-01-21 12:41:23 -0700 | [diff] [blame] | 1242 | |
| 1243 | if (!checkAllowedOperationParams(params.params)) { |
| 1244 | return KM_ERROR_INVALID_ARGUMENT; |
| 1245 | } |
| 1246 | |
| 1247 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
| 1248 | |
| 1249 | Blob keyBlob; |
| 1250 | String8 name8(name); |
| 1251 | ResponseCode responseCode = |
| 1252 | mKeyStore->getKeyForName(&keyBlob, name8, callingUid, TYPE_KEYMASTER_10); |
| 1253 | if (responseCode != ::NO_ERROR) { |
| 1254 | return responseCode; |
| 1255 | } |
| 1256 | |
| 1257 | keymaster_key_blob_t key = {keyBlob.getValue(), |
| 1258 | static_cast<size_t>(std::max(0, keyBlob.getLength()))}; |
| 1259 | auto* dev = mKeyStore->getDeviceForBlob(keyBlob); |
Janis Danisevskis | 18f27ad | 2016-06-01 13:57:40 -0700 | [diff] [blame] | 1260 | if (!dev->attest_key) return KM_ERROR_UNIMPLEMENTED; |
| 1261 | |
Janis Danisevskis | 18f27ad | 2016-06-01 13:57:40 -0700 | [diff] [blame] | 1262 | auto asn1_attestation_id_result = security::gather_attestation_application_id(callingUid); |
Janis Danisevskis | 011675d | 2016-09-01 11:41:29 +0100 | [diff] [blame] | 1263 | if (!asn1_attestation_id_result.isOk()) { |
Janis Danisevskis | 18f27ad | 2016-06-01 13:57:40 -0700 | [diff] [blame] | 1264 | ALOGE("failed to gather attestation_id"); |
| 1265 | return KM_ERROR_ATTESTATION_APPLICATION_ID_MISSING; |
| 1266 | } |
Janis Danisevskis | 011675d | 2016-09-01 11:41:29 +0100 | [diff] [blame] | 1267 | const std::vector<uint8_t>& asn1_attestation_id = asn1_attestation_id_result; |
Janis Danisevskis | 18f27ad | 2016-06-01 13:57:40 -0700 | [diff] [blame] | 1268 | |
| 1269 | /* |
| 1270 | * Make a mutable copy of the params vector which to append the attestation id to. |
| 1271 | * The copy is shallow, and the lifetime of the inner objects is the calling scope. |
| 1272 | */ |
| 1273 | auto mutable_params = params.params; |
| 1274 | |
Janis Danisevskis | 011675d | 2016-09-01 11:41:29 +0100 | [diff] [blame] | 1275 | mutable_params.push_back( |
| 1276 | {.tag = KM_TAG_ATTESTATION_APPLICATION_ID, |
| 1277 | .blob = {asn1_attestation_id.data(), |
Janis Danisevskis | 7612fd4 | 2016-09-01 11:50:02 +0100 | [diff] [blame] | 1278 | std::min(asn1_attestation_id.size(), KEY_ATTESTATION_APPLICATION_ID_MAX_SIZE)}}); |
Shawn Willden | 50eb1b2 | 2016-01-21 12:41:23 -0700 | [diff] [blame] | 1279 | |
| 1280 | const keymaster_key_param_set_t in_params = { |
Janis Danisevskis | 18f27ad | 2016-06-01 13:57:40 -0700 | [diff] [blame] | 1281 | const_cast<keymaster_key_param_t*>(mutable_params.data()), mutable_params.size()}; |
Shawn Willden | 50eb1b2 | 2016-01-21 12:41:23 -0700 | [diff] [blame] | 1282 | outChain->chain = {nullptr, 0}; |
| 1283 | int32_t rc = dev->attest_key(dev, &key, &in_params, &outChain->chain); |
Janis Danisevskis | 18f27ad | 2016-06-01 13:57:40 -0700 | [diff] [blame] | 1284 | if (rc) return rc; |
Shawn Willden | 50eb1b2 | 2016-01-21 12:41:23 -0700 | [diff] [blame] | 1285 | return ::NO_ERROR; |
| 1286 | } |
| 1287 | |
Tucker Sylvestro | 0ab28b7 | 2016-08-05 18:02:47 -0400 | [diff] [blame] | 1288 | int32_t KeyStoreService::onDeviceOffBody() { |
| 1289 | // TODO(tuckeris): add permission check. This should be callable from ClockworkHome only. |
| 1290 | mAuthTokenTable.onDeviceOffBody(); |
| 1291 | return ::NO_ERROR; |
| 1292 | } |
| 1293 | |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 1294 | /** |
| 1295 | * Prune the oldest pruneable operation. |
| 1296 | */ |
| 1297 | bool KeyStoreService::pruneOperation() { |
| 1298 | sp<IBinder> oldest = mOperationMap.getOldestPruneableOperation(); |
| 1299 | ALOGD("Trying to prune operation %p", oldest.get()); |
| 1300 | size_t op_count_before_abort = mOperationMap.getOperationCount(); |
| 1301 | // We mostly ignore errors from abort() because all we care about is whether at least |
| 1302 | // one operation has been removed. |
| 1303 | int abort_error = abort(oldest); |
| 1304 | if (mOperationMap.getOperationCount() >= op_count_before_abort) { |
| 1305 | ALOGE("Failed to abort pruneable operation %p, error: %d", oldest.get(), abort_error); |
| 1306 | return false; |
| 1307 | } |
| 1308 | return true; |
| 1309 | } |
| 1310 | |
| 1311 | /** |
| 1312 | * Get the effective target uid for a binder operation that takes an |
| 1313 | * optional uid as the target. |
| 1314 | */ |
| 1315 | uid_t KeyStoreService::getEffectiveUid(int32_t targetUid) { |
| 1316 | if (targetUid == UID_SELF) { |
| 1317 | return IPCThreadState::self()->getCallingUid(); |
| 1318 | } |
| 1319 | return static_cast<uid_t>(targetUid); |
| 1320 | } |
| 1321 | |
| 1322 | /** |
| 1323 | * Check if the caller of the current binder method has the required |
| 1324 | * permission and if acting on other uids the grants to do so. |
| 1325 | */ |
| 1326 | bool KeyStoreService::checkBinderPermission(perm_t permission, int32_t targetUid) { |
| 1327 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
| 1328 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
| 1329 | if (!has_permission(callingUid, permission, spid)) { |
| 1330 | ALOGW("permission %s denied for %d", get_perm_label(permission), callingUid); |
| 1331 | return false; |
| 1332 | } |
| 1333 | if (!is_granted_to(callingUid, getEffectiveUid(targetUid))) { |
| 1334 | ALOGW("uid %d not granted to act for %d", callingUid, targetUid); |
| 1335 | return false; |
| 1336 | } |
| 1337 | return true; |
| 1338 | } |
| 1339 | |
| 1340 | /** |
| 1341 | * Check if the caller of the current binder method has the required |
| 1342 | * permission and the target uid is the caller or the caller is system. |
| 1343 | */ |
| 1344 | bool KeyStoreService::checkBinderPermissionSelfOrSystem(perm_t permission, int32_t targetUid) { |
| 1345 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
| 1346 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
| 1347 | if (!has_permission(callingUid, permission, spid)) { |
| 1348 | ALOGW("permission %s denied for %d", get_perm_label(permission), callingUid); |
| 1349 | return false; |
| 1350 | } |
| 1351 | return getEffectiveUid(targetUid) == callingUid || callingUid == AID_SYSTEM; |
| 1352 | } |
| 1353 | |
| 1354 | /** |
| 1355 | * Check if the caller of the current binder method has the required |
| 1356 | * permission or the target of the operation is the caller's uid. This is |
| 1357 | * for operation where the permission is only for cross-uid activity and all |
| 1358 | * uids are allowed to act on their own (ie: clearing all entries for a |
| 1359 | * given uid). |
| 1360 | */ |
| 1361 | bool KeyStoreService::checkBinderPermissionOrSelfTarget(perm_t permission, int32_t targetUid) { |
| 1362 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
| 1363 | if (getEffectiveUid(targetUid) == callingUid) { |
| 1364 | return true; |
| 1365 | } else { |
| 1366 | return checkBinderPermission(permission, targetUid); |
| 1367 | } |
| 1368 | } |
| 1369 | |
| 1370 | /** |
| 1371 | * Helper method to check that the caller has the required permission as |
| 1372 | * well as the keystore is in the unlocked state if checkUnlocked is true. |
| 1373 | * |
| 1374 | * Returns NO_ERROR on success, PERMISSION_DENIED on a permission error and |
| 1375 | * otherwise the state of keystore when not unlocked and checkUnlocked is |
| 1376 | * true. |
| 1377 | */ |
| 1378 | int32_t KeyStoreService::checkBinderPermissionAndKeystoreState(perm_t permission, int32_t targetUid, |
| 1379 | bool checkUnlocked) { |
| 1380 | if (!checkBinderPermission(permission, targetUid)) { |
| 1381 | return ::PERMISSION_DENIED; |
| 1382 | } |
| 1383 | State state = mKeyStore->getState(get_user_id(getEffectiveUid(targetUid))); |
| 1384 | if (checkUnlocked && !isKeystoreUnlocked(state)) { |
| 1385 | return state; |
| 1386 | } |
| 1387 | |
| 1388 | return ::NO_ERROR; |
| 1389 | } |
| 1390 | |
| 1391 | bool KeyStoreService::isKeystoreUnlocked(State state) { |
| 1392 | switch (state) { |
| 1393 | case ::STATE_NO_ERROR: |
| 1394 | return true; |
| 1395 | case ::STATE_UNINITIALIZED: |
| 1396 | case ::STATE_LOCKED: |
| 1397 | return false; |
| 1398 | } |
| 1399 | return false; |
| 1400 | } |
| 1401 | |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 1402 | bool KeyStoreService::isKeyTypeSupported(const keymaster2_device_t* device, |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 1403 | keymaster_keypair_t keyType) { |
| 1404 | const int32_t device_api = device->common.module->module_api_version; |
| 1405 | if (device_api == KEYMASTER_MODULE_API_VERSION_0_2) { |
| 1406 | switch (keyType) { |
| 1407 | case TYPE_RSA: |
| 1408 | case TYPE_DSA: |
| 1409 | case TYPE_EC: |
| 1410 | return true; |
| 1411 | default: |
| 1412 | return false; |
| 1413 | } |
| 1414 | } else if (device_api >= KEYMASTER_MODULE_API_VERSION_0_3) { |
| 1415 | switch (keyType) { |
| 1416 | case TYPE_RSA: |
| 1417 | return true; |
| 1418 | case TYPE_DSA: |
| 1419 | return device->flags & KEYMASTER_SUPPORTS_DSA; |
| 1420 | case TYPE_EC: |
| 1421 | return device->flags & KEYMASTER_SUPPORTS_EC; |
| 1422 | default: |
| 1423 | return false; |
| 1424 | } |
| 1425 | } else { |
| 1426 | return keyType == TYPE_RSA; |
| 1427 | } |
| 1428 | } |
| 1429 | |
| 1430 | /** |
| 1431 | * Check that all keymaster_key_param_t's provided by the application are |
| 1432 | * allowed. Any parameter that keystore adds itself should be disallowed here. |
| 1433 | */ |
| 1434 | bool KeyStoreService::checkAllowedOperationParams( |
| 1435 | const std::vector<keymaster_key_param_t>& params) { |
| 1436 | for (auto param : params) { |
| 1437 | switch (param.tag) { |
| 1438 | case KM_TAG_AUTH_TOKEN: |
Janis Danisevskis | 18f27ad | 2016-06-01 13:57:40 -0700 | [diff] [blame] | 1439 | // fall through intended |
| 1440 | case KM_TAG_ATTESTATION_APPLICATION_ID: |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 1441 | return false; |
| 1442 | default: |
| 1443 | break; |
| 1444 | } |
| 1445 | } |
| 1446 | return true; |
| 1447 | } |
| 1448 | |
| 1449 | keymaster_error_t KeyStoreService::getOperationCharacteristics( |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 1450 | const keymaster_key_blob_t& key, const keymaster2_device_t* dev, |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 1451 | const std::vector<keymaster_key_param_t>& params, keymaster_key_characteristics_t* out) { |
| 1452 | UniquePtr<keymaster_blob_t> appId; |
| 1453 | UniquePtr<keymaster_blob_t> appData; |
| 1454 | for (auto param : params) { |
| 1455 | if (param.tag == KM_TAG_APPLICATION_ID) { |
| 1456 | appId.reset(new keymaster_blob_t); |
| 1457 | appId->data = param.blob.data; |
| 1458 | appId->data_length = param.blob.data_length; |
| 1459 | } else if (param.tag == KM_TAG_APPLICATION_DATA) { |
| 1460 | appData.reset(new keymaster_blob_t); |
| 1461 | appData->data = param.blob.data; |
| 1462 | appData->data_length = param.blob.data_length; |
| 1463 | } |
| 1464 | } |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 1465 | keymaster_key_characteristics_t result = {{nullptr, 0}, {nullptr, 0}}; |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 1466 | if (!dev->get_key_characteristics) { |
| 1467 | return KM_ERROR_UNIMPLEMENTED; |
| 1468 | } |
| 1469 | keymaster_error_t error = |
| 1470 | dev->get_key_characteristics(dev, &key, appId.get(), appData.get(), &result); |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 1471 | if (error == KM_ERROR_OK) { |
| 1472 | *out = result; |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 1473 | } |
| 1474 | return error; |
| 1475 | } |
| 1476 | |
| 1477 | /** |
| 1478 | * Get the auth token for this operation from the auth token table. |
| 1479 | * |
| 1480 | * Returns ::NO_ERROR if the auth token was set or none was required. |
| 1481 | * ::OP_AUTH_NEEDED if it is a per op authorization, no |
| 1482 | * authorization token exists for that operation and |
| 1483 | * failOnTokenMissing is false. |
| 1484 | * KM_ERROR_KEY_USER_NOT_AUTHENTICATED if there is no valid auth |
| 1485 | * token for the operation |
| 1486 | */ |
| 1487 | int32_t KeyStoreService::getAuthToken(const keymaster_key_characteristics_t* characteristics, |
| 1488 | keymaster_operation_handle_t handle, |
| 1489 | keymaster_purpose_t purpose, |
| 1490 | const hw_auth_token_t** authToken, bool failOnTokenMissing) { |
| 1491 | |
| 1492 | std::vector<keymaster_key_param_t> allCharacteristics; |
| 1493 | for (size_t i = 0; i < characteristics->sw_enforced.length; i++) { |
| 1494 | allCharacteristics.push_back(characteristics->sw_enforced.params[i]); |
| 1495 | } |
| 1496 | for (size_t i = 0; i < characteristics->hw_enforced.length; i++) { |
| 1497 | allCharacteristics.push_back(characteristics->hw_enforced.params[i]); |
| 1498 | } |
| 1499 | keymaster::AuthTokenTable::Error err = mAuthTokenTable.FindAuthorization( |
| 1500 | allCharacteristics.data(), allCharacteristics.size(), purpose, handle, authToken); |
| 1501 | switch (err) { |
| 1502 | case keymaster::AuthTokenTable::OK: |
| 1503 | case keymaster::AuthTokenTable::AUTH_NOT_REQUIRED: |
| 1504 | return ::NO_ERROR; |
| 1505 | case keymaster::AuthTokenTable::AUTH_TOKEN_NOT_FOUND: |
| 1506 | case keymaster::AuthTokenTable::AUTH_TOKEN_EXPIRED: |
| 1507 | case keymaster::AuthTokenTable::AUTH_TOKEN_WRONG_SID: |
| 1508 | return KM_ERROR_KEY_USER_NOT_AUTHENTICATED; |
| 1509 | case keymaster::AuthTokenTable::OP_HANDLE_REQUIRED: |
| 1510 | return failOnTokenMissing ? (int32_t)KM_ERROR_KEY_USER_NOT_AUTHENTICATED |
| 1511 | : (int32_t)::OP_AUTH_NEEDED; |
| 1512 | default: |
| 1513 | ALOGE("Unexpected FindAuthorization return value %d", err); |
| 1514 | return KM_ERROR_INVALID_ARGUMENT; |
| 1515 | } |
| 1516 | } |
| 1517 | |
| 1518 | inline void KeyStoreService::addAuthToParams(std::vector<keymaster_key_param_t>* params, |
| 1519 | const hw_auth_token_t* token) { |
| 1520 | if (token) { |
| 1521 | params->push_back(keymaster_param_blob( |
| 1522 | KM_TAG_AUTH_TOKEN, reinterpret_cast<const uint8_t*>(token), sizeof(hw_auth_token_t))); |
| 1523 | } |
| 1524 | } |
| 1525 | |
| 1526 | /** |
| 1527 | * Add the auth token for the operation to the param list if the operation |
| 1528 | * requires authorization. Uses the cached result in the OperationMap if available |
| 1529 | * otherwise gets the token from the AuthTokenTable and caches the result. |
| 1530 | * |
| 1531 | * Returns ::NO_ERROR if the auth token was added or not needed. |
| 1532 | * KM_ERROR_KEY_USER_NOT_AUTHENTICATED if the operation is not |
| 1533 | * authenticated. |
| 1534 | * KM_ERROR_INVALID_OPERATION_HANDLE if token is not a valid |
| 1535 | * operation token. |
| 1536 | */ |
Chih-Hung Hsieh | 24b2a39 | 2016-07-28 10:35:24 -0700 | [diff] [blame] | 1537 | int32_t KeyStoreService::addOperationAuthTokenIfNeeded(const sp<IBinder>& token, |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 1538 | std::vector<keymaster_key_param_t>* params) { |
| 1539 | const hw_auth_token_t* authToken = NULL; |
| 1540 | mOperationMap.getOperationAuthToken(token, &authToken); |
| 1541 | if (!authToken) { |
Shawn Willden | 715d023 | 2016-01-21 00:45:13 -0700 | [diff] [blame] | 1542 | const keymaster2_device_t* dev; |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 1543 | keymaster_operation_handle_t handle; |
| 1544 | const keymaster_key_characteristics_t* characteristics = NULL; |
| 1545 | keymaster_purpose_t purpose; |
| 1546 | keymaster::km_id_t keyid; |
| 1547 | if (!mOperationMap.getOperation(token, &handle, &keyid, &purpose, &dev, &characteristics)) { |
| 1548 | return KM_ERROR_INVALID_OPERATION_HANDLE; |
| 1549 | } |
| 1550 | int32_t result = getAuthToken(characteristics, handle, purpose, &authToken); |
| 1551 | if (result != ::NO_ERROR) { |
| 1552 | return result; |
| 1553 | } |
| 1554 | if (authToken) { |
| 1555 | mOperationMap.setOperationAuthToken(token, authToken); |
| 1556 | } |
| 1557 | } |
| 1558 | addAuthToParams(params, authToken); |
| 1559 | return ::NO_ERROR; |
| 1560 | } |
| 1561 | |
| 1562 | /** |
| 1563 | * Translate a result value to a legacy return value. All keystore errors are |
| 1564 | * preserved and keymaster errors become SYSTEM_ERRORs |
| 1565 | */ |
| 1566 | int32_t KeyStoreService::translateResultToLegacyResult(int32_t result) { |
| 1567 | if (result > 0) { |
| 1568 | return result; |
| 1569 | } |
| 1570 | return ::SYSTEM_ERROR; |
| 1571 | } |
| 1572 | |
| 1573 | keymaster_key_param_t* |
| 1574 | KeyStoreService::getKeyAlgorithm(keymaster_key_characteristics_t* characteristics) { |
| 1575 | for (size_t i = 0; i < characteristics->hw_enforced.length; i++) { |
| 1576 | if (characteristics->hw_enforced.params[i].tag == KM_TAG_ALGORITHM) { |
| 1577 | return &characteristics->hw_enforced.params[i]; |
| 1578 | } |
| 1579 | } |
| 1580 | for (size_t i = 0; i < characteristics->sw_enforced.length; i++) { |
| 1581 | if (characteristics->sw_enforced.params[i].tag == KM_TAG_ALGORITHM) { |
| 1582 | return &characteristics->sw_enforced.params[i]; |
| 1583 | } |
| 1584 | } |
| 1585 | return NULL; |
| 1586 | } |
| 1587 | |
| 1588 | void KeyStoreService::addLegacyBeginParams(const String16& name, |
| 1589 | std::vector<keymaster_key_param_t>& params) { |
| 1590 | // All legacy keys are DIGEST_NONE/PAD_NONE. |
| 1591 | params.push_back(keymaster_param_enum(KM_TAG_DIGEST, KM_DIGEST_NONE)); |
| 1592 | params.push_back(keymaster_param_enum(KM_TAG_PADDING, KM_PAD_NONE)); |
| 1593 | |
| 1594 | // Look up the algorithm of the key. |
| 1595 | KeyCharacteristics characteristics; |
| 1596 | int32_t rc = getKeyCharacteristics(name, NULL, NULL, UID_SELF, &characteristics); |
| 1597 | if (rc != ::NO_ERROR) { |
| 1598 | ALOGE("Failed to get key characteristics"); |
| 1599 | return; |
| 1600 | } |
| 1601 | keymaster_key_param_t* algorithm = getKeyAlgorithm(&characteristics.characteristics); |
| 1602 | if (!algorithm) { |
| 1603 | ALOGE("getKeyCharacteristics did not include KM_TAG_ALGORITHM"); |
| 1604 | return; |
| 1605 | } |
| 1606 | params.push_back(*algorithm); |
| 1607 | } |
| 1608 | |
| 1609 | int32_t KeyStoreService::doLegacySignVerify(const String16& name, const uint8_t* data, |
| 1610 | size_t length, uint8_t** out, size_t* outLength, |
| 1611 | const uint8_t* signature, size_t signatureLength, |
| 1612 | keymaster_purpose_t purpose) { |
| 1613 | |
| 1614 | std::basic_stringstream<uint8_t> outBuffer; |
| 1615 | OperationResult result; |
| 1616 | KeymasterArguments inArgs; |
| 1617 | addLegacyBeginParams(name, inArgs.params); |
| 1618 | sp<IBinder> appToken(new BBinder); |
| 1619 | sp<IBinder> token; |
| 1620 | |
| 1621 | begin(appToken, name, purpose, true, inArgs, NULL, 0, UID_SELF, &result); |
| 1622 | if (result.resultCode != ResponseCode::NO_ERROR) { |
| 1623 | if (result.resultCode == ::KEY_NOT_FOUND) { |
| 1624 | ALOGW("Key not found"); |
| 1625 | } else { |
| 1626 | ALOGW("Error in begin: %d", result.resultCode); |
| 1627 | } |
| 1628 | return translateResultToLegacyResult(result.resultCode); |
| 1629 | } |
| 1630 | inArgs.params.clear(); |
| 1631 | token = result.token; |
| 1632 | size_t consumed = 0; |
| 1633 | size_t lastConsumed = 0; |
| 1634 | do { |
| 1635 | update(token, inArgs, data + consumed, length - consumed, &result); |
| 1636 | if (result.resultCode != ResponseCode::NO_ERROR) { |
| 1637 | ALOGW("Error in update: %d", result.resultCode); |
| 1638 | return translateResultToLegacyResult(result.resultCode); |
| 1639 | } |
| 1640 | if (out) { |
| 1641 | outBuffer.write(result.data.get(), result.dataLength); |
| 1642 | } |
| 1643 | lastConsumed = result.inputConsumed; |
| 1644 | consumed += lastConsumed; |
| 1645 | } while (consumed < length && lastConsumed > 0); |
| 1646 | |
| 1647 | if (consumed != length) { |
| 1648 | ALOGW("Not all data consumed. Consumed %zu of %zu", consumed, length); |
| 1649 | return ::SYSTEM_ERROR; |
| 1650 | } |
| 1651 | |
| 1652 | finish(token, inArgs, signature, signatureLength, NULL, 0, &result); |
| 1653 | if (result.resultCode != ResponseCode::NO_ERROR) { |
| 1654 | ALOGW("Error in finish: %d", result.resultCode); |
| 1655 | return translateResultToLegacyResult(result.resultCode); |
| 1656 | } |
| 1657 | if (out) { |
| 1658 | outBuffer.write(result.data.get(), result.dataLength); |
| 1659 | } |
| 1660 | |
| 1661 | if (out) { |
| 1662 | auto buf = outBuffer.str(); |
| 1663 | *out = new uint8_t[buf.size()]; |
| 1664 | memcpy(*out, buf.c_str(), buf.size()); |
| 1665 | *outLength = buf.size(); |
| 1666 | } |
| 1667 | |
| 1668 | return ::NO_ERROR; |
| 1669 | } |
| 1670 | |
Shawn Willden | 98c5916 | 2016-03-20 09:10:18 -0600 | [diff] [blame] | 1671 | int32_t KeyStoreService::upgradeKeyBlob(const String16& name, uid_t uid, |
| 1672 | const AuthorizationSet& params, Blob* blob) { |
| 1673 | // Read the blob rather than assuming the caller provided the right name/uid/blob triplet. |
| 1674 | String8 name8(name); |
| 1675 | ResponseCode responseCode = mKeyStore->getKeyForName(blob, name8, uid, TYPE_KEYMASTER_10); |
| 1676 | if (responseCode != ::NO_ERROR) { |
| 1677 | return responseCode; |
| 1678 | } |
| 1679 | |
| 1680 | keymaster_key_blob_t key = {blob->getValue(), static_cast<size_t>(blob->getLength())}; |
| 1681 | auto* dev = mKeyStore->getDeviceForBlob(*blob); |
| 1682 | keymaster_key_blob_t upgraded_key; |
| 1683 | int32_t rc = dev->upgrade_key(dev, &key, ¶ms, &upgraded_key); |
| 1684 | if (rc != KM_ERROR_OK) { |
| 1685 | return rc; |
| 1686 | } |
| 1687 | UniquePtr<uint8_t, Malloc_Delete> upgraded_key_deleter( |
| 1688 | const_cast<uint8_t*>(upgraded_key.key_material)); |
| 1689 | |
Ji Wang | 2f7db31 | 2016-10-14 17:49:16 +0800 | [diff] [blame] | 1690 | String8 filename(mKeyStore->getKeyNameForUidWithDir(name8, uid, ::TYPE_KEYMASTER_10)); |
| 1691 | rc = mKeyStore->del(filename.string(), ::TYPE_ANY, get_user_id(uid)); |
Shawn Willden | 98c5916 | 2016-03-20 09:10:18 -0600 | [diff] [blame] | 1692 | if (rc != ::NO_ERROR) { |
| 1693 | return rc; |
| 1694 | } |
| 1695 | |
Shawn Willden | 98c5916 | 2016-03-20 09:10:18 -0600 | [diff] [blame] | 1696 | Blob newBlob(upgraded_key.key_material, upgraded_key.key_material_size, nullptr /* info */, |
| 1697 | 0 /* infoLength */, ::TYPE_KEYMASTER_10); |
| 1698 | newBlob.setFallback(blob->isFallback()); |
| 1699 | newBlob.setEncrypted(blob->isEncrypted()); |
| 1700 | |
| 1701 | rc = mKeyStore->put(filename.string(), &newBlob, get_user_id(uid)); |
| 1702 | |
| 1703 | // Re-read blob for caller. We can't use newBlob because writing it modified it. |
| 1704 | responseCode = mKeyStore->getKeyForName(blob, name8, uid, TYPE_KEYMASTER_10); |
| 1705 | if (responseCode != ::NO_ERROR) { |
| 1706 | return responseCode; |
| 1707 | } |
| 1708 | |
| 1709 | return rc; |
| 1710 | } |
| 1711 | |
Shawn Willden | c1d1fee | 2016-01-26 22:44:56 -0700 | [diff] [blame] | 1712 | } // namespace android |