Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2009 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 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 17 | //#define LOG_NDEBUG 0 |
| 18 | #define LOG_TAG "keystore" |
| 19 | |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 20 | #include <stdio.h> |
| 21 | #include <stdint.h> |
| 22 | #include <string.h> |
| 23 | #include <unistd.h> |
| 24 | #include <signal.h> |
| 25 | #include <errno.h> |
| 26 | #include <dirent.h> |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 27 | #include <errno.h> |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 28 | #include <fcntl.h> |
| 29 | #include <limits.h> |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 30 | #include <assert.h> |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 31 | #include <sys/types.h> |
| 32 | #include <sys/socket.h> |
| 33 | #include <sys/stat.h> |
| 34 | #include <sys/time.h> |
| 35 | #include <arpa/inet.h> |
| 36 | |
| 37 | #include <openssl/aes.h> |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 38 | #include <openssl/bio.h> |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 39 | #include <openssl/evp.h> |
| 40 | #include <openssl/md5.h> |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 41 | #include <openssl/pem.h> |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 42 | |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 43 | #include <hardware/keymaster.h> |
| 44 | |
Kenny Root | 17208e0 | 2013-09-04 13:56:03 -0700 | [diff] [blame] | 45 | #include <keymaster/softkeymaster.h> |
| 46 | |
Kenny Root | 26cfc08 | 2013-09-11 14:38:56 -0700 | [diff] [blame] | 47 | #include <UniquePtr.h> |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 48 | #include <utils/String8.h> |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 49 | #include <utils/Vector.h> |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 50 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 51 | #include <keystore/IKeystoreService.h> |
| 52 | #include <binder/IPCThreadState.h> |
| 53 | #include <binder/IServiceManager.h> |
| 54 | |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 55 | #include <cutils/log.h> |
| 56 | #include <cutils/sockets.h> |
| 57 | #include <private/android_filesystem_config.h> |
| 58 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 59 | #include <keystore/keystore.h> |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 60 | |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 61 | #include <selinux/android.h> |
| 62 | |
Kenny Root | 96427ba | 2013-08-16 14:02:41 -0700 | [diff] [blame] | 63 | #include "defaults.h" |
| 64 | |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 65 | /* KeyStore is a secured storage for key-value pairs. In this implementation, |
| 66 | * each file stores one key-value pair. Keys are encoded in file names, and |
| 67 | * values are encrypted with checksums. The encryption key is protected by a |
| 68 | * user-defined password. To keep things simple, buffers are always larger than |
| 69 | * the maximum space we needed, so boundary checks on buffers are omitted. */ |
| 70 | |
| 71 | #define KEY_SIZE ((NAME_MAX - 15) / 2) |
| 72 | #define VALUE_SIZE 32768 |
| 73 | #define PASSWORD_SIZE VALUE_SIZE |
| 74 | |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 75 | |
Kenny Root | 96427ba | 2013-08-16 14:02:41 -0700 | [diff] [blame] | 76 | struct BIGNUM_Delete { |
| 77 | void operator()(BIGNUM* p) const { |
| 78 | BN_free(p); |
| 79 | } |
| 80 | }; |
| 81 | typedef UniquePtr<BIGNUM, BIGNUM_Delete> Unique_BIGNUM; |
| 82 | |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 83 | struct BIO_Delete { |
| 84 | void operator()(BIO* p) const { |
| 85 | BIO_free(p); |
| 86 | } |
| 87 | }; |
| 88 | typedef UniquePtr<BIO, BIO_Delete> Unique_BIO; |
| 89 | |
| 90 | struct EVP_PKEY_Delete { |
| 91 | void operator()(EVP_PKEY* p) const { |
| 92 | EVP_PKEY_free(p); |
| 93 | } |
| 94 | }; |
| 95 | typedef UniquePtr<EVP_PKEY, EVP_PKEY_Delete> Unique_EVP_PKEY; |
| 96 | |
| 97 | struct PKCS8_PRIV_KEY_INFO_Delete { |
| 98 | void operator()(PKCS8_PRIV_KEY_INFO* p) const { |
| 99 | PKCS8_PRIV_KEY_INFO_free(p); |
| 100 | } |
| 101 | }; |
| 102 | typedef UniquePtr<PKCS8_PRIV_KEY_INFO, PKCS8_PRIV_KEY_INFO_Delete> Unique_PKCS8_PRIV_KEY_INFO; |
| 103 | |
| 104 | |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 105 | static int keymaster_device_initialize(keymaster_device_t** dev) { |
| 106 | int rc; |
| 107 | |
| 108 | const hw_module_t* mod; |
| 109 | rc = hw_get_module_by_class(KEYSTORE_HARDWARE_MODULE_ID, NULL, &mod); |
| 110 | if (rc) { |
| 111 | ALOGE("could not find any keystore module"); |
| 112 | goto out; |
| 113 | } |
| 114 | |
| 115 | rc = keymaster_open(mod, dev); |
| 116 | if (rc) { |
| 117 | ALOGE("could not open keymaster device in %s (%s)", |
| 118 | KEYSTORE_HARDWARE_MODULE_ID, strerror(-rc)); |
| 119 | goto out; |
| 120 | } |
| 121 | |
| 122 | return 0; |
| 123 | |
| 124 | out: |
| 125 | *dev = NULL; |
| 126 | return rc; |
| 127 | } |
| 128 | |
| 129 | static void keymaster_device_release(keymaster_device_t* dev) { |
| 130 | keymaster_close(dev); |
| 131 | } |
| 132 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 133 | /*************** |
| 134 | * PERMISSIONS * |
| 135 | ***************/ |
| 136 | |
| 137 | /* Here are the permissions, actions, users, and the main function. */ |
| 138 | typedef enum { |
Robin Lee | 4e86575 | 2014-08-19 17:37:55 +0100 | [diff] [blame] | 139 | P_TEST = 1 << 0, |
| 140 | P_GET = 1 << 1, |
| 141 | P_INSERT = 1 << 2, |
| 142 | P_DELETE = 1 << 3, |
| 143 | P_EXIST = 1 << 4, |
| 144 | P_SAW = 1 << 5, |
| 145 | P_RESET = 1 << 6, |
| 146 | P_PASSWORD = 1 << 7, |
| 147 | P_LOCK = 1 << 8, |
| 148 | P_UNLOCK = 1 << 9, |
| 149 | P_ZERO = 1 << 10, |
| 150 | P_SIGN = 1 << 11, |
| 151 | P_VERIFY = 1 << 12, |
| 152 | P_GRANT = 1 << 13, |
| 153 | P_DUPLICATE = 1 << 14, |
| 154 | P_CLEAR_UID = 1 << 15, |
| 155 | P_RESET_UID = 1 << 16, |
| 156 | P_SYNC_UID = 1 << 17, |
| 157 | P_PASSWORD_UID = 1 << 18, |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 158 | } perm_t; |
| 159 | |
| 160 | static struct user_euid { |
| 161 | uid_t uid; |
| 162 | uid_t euid; |
| 163 | } user_euids[] = { |
| 164 | {AID_VPN, AID_SYSTEM}, |
| 165 | {AID_WIFI, AID_SYSTEM}, |
| 166 | {AID_ROOT, AID_SYSTEM}, |
| 167 | }; |
| 168 | |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 169 | /* perm_labels associcated with keystore_key SELinux class verbs. */ |
| 170 | const char *perm_labels[] = { |
| 171 | "test", |
| 172 | "get", |
| 173 | "insert", |
| 174 | "delete", |
| 175 | "exist", |
| 176 | "saw", |
| 177 | "reset", |
| 178 | "password", |
| 179 | "lock", |
| 180 | "unlock", |
| 181 | "zero", |
| 182 | "sign", |
| 183 | "verify", |
| 184 | "grant", |
| 185 | "duplicate", |
Robin Lee | 4e86575 | 2014-08-19 17:37:55 +0100 | [diff] [blame] | 186 | "clear_uid", |
| 187 | "reset_uid", |
| 188 | "sync_uid", |
| 189 | "password_uid", |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 190 | }; |
| 191 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 192 | static struct user_perm { |
| 193 | uid_t uid; |
| 194 | perm_t perms; |
| 195 | } user_perms[] = { |
| 196 | {AID_SYSTEM, static_cast<perm_t>((uint32_t)(~0)) }, |
| 197 | {AID_VPN, static_cast<perm_t>(P_GET | P_SIGN | P_VERIFY) }, |
| 198 | {AID_WIFI, static_cast<perm_t>(P_GET | P_SIGN | P_VERIFY) }, |
| 199 | {AID_ROOT, static_cast<perm_t>(P_GET) }, |
| 200 | }; |
| 201 | |
| 202 | static const perm_t DEFAULT_PERMS = static_cast<perm_t>(P_TEST | P_GET | P_INSERT | P_DELETE | P_EXIST | P_SAW | P_SIGN |
| 203 | | P_VERIFY); |
| 204 | |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 205 | static char *tctx; |
| 206 | static int ks_is_selinux_enabled; |
| 207 | |
| 208 | static const char *get_perm_label(perm_t perm) { |
| 209 | unsigned int index = ffs(perm); |
| 210 | if (index > 0 && index <= (sizeof(perm_labels) / sizeof(perm_labels[0]))) { |
| 211 | return perm_labels[index - 1]; |
| 212 | } else { |
| 213 | ALOGE("Keystore: Failed to retrieve permission label.\n"); |
| 214 | abort(); |
| 215 | } |
| 216 | } |
| 217 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 218 | /** |
| 219 | * Returns the app ID (in the Android multi-user sense) for the current |
| 220 | * UNIX UID. |
| 221 | */ |
| 222 | static uid_t get_app_id(uid_t uid) { |
| 223 | return uid % AID_USER; |
| 224 | } |
| 225 | |
| 226 | /** |
| 227 | * Returns the user ID (in the Android multi-user sense) for the current |
| 228 | * UNIX UID. |
| 229 | */ |
| 230 | static uid_t get_user_id(uid_t uid) { |
| 231 | return uid / AID_USER; |
| 232 | } |
| 233 | |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 234 | static bool keystore_selinux_check_access(uid_t uid, perm_t perm, pid_t spid) { |
| 235 | if (!ks_is_selinux_enabled) { |
| 236 | return true; |
| 237 | } |
Nick Kralevich | 66dbf67 | 2014-06-30 17:09:14 +0000 | [diff] [blame] | 238 | |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 239 | char *sctx = NULL; |
| 240 | const char *selinux_class = "keystore_key"; |
| 241 | const char *str_perm = get_perm_label(perm); |
| 242 | |
| 243 | if (!str_perm) { |
| 244 | return false; |
| 245 | } |
| 246 | |
| 247 | if (getpidcon(spid, &sctx) != 0) { |
| 248 | ALOGE("SELinux: Failed to get source pid context.\n"); |
| 249 | return false; |
| 250 | } |
| 251 | |
| 252 | bool allowed = selinux_check_access(sctx, tctx, selinux_class, str_perm, |
| 253 | NULL) == 0; |
| 254 | freecon(sctx); |
| 255 | return allowed; |
| 256 | } |
| 257 | |
| 258 | static bool has_permission(uid_t uid, perm_t perm, pid_t spid) { |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 259 | // All system users are equivalent for multi-user support. |
| 260 | if (get_app_id(uid) == AID_SYSTEM) { |
| 261 | uid = AID_SYSTEM; |
| 262 | } |
| 263 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 264 | for (size_t i = 0; i < sizeof(user_perms)/sizeof(user_perms[0]); i++) { |
| 265 | struct user_perm user = user_perms[i]; |
| 266 | if (user.uid == uid) { |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 267 | return (user.perms & perm) && |
| 268 | keystore_selinux_check_access(uid, perm, spid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 269 | } |
| 270 | } |
| 271 | |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 272 | return (DEFAULT_PERMS & perm) && |
| 273 | keystore_selinux_check_access(uid, perm, spid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 274 | } |
| 275 | |
Kenny Root | 4946890 | 2013-03-19 13:41:33 -0700 | [diff] [blame] | 276 | /** |
| 277 | * Returns the UID that the callingUid should act as. This is here for |
| 278 | * legacy support of the WiFi and VPN systems and should be removed |
| 279 | * when WiFi can operate in its own namespace. |
| 280 | */ |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 281 | static uid_t get_keystore_euid(uid_t uid) { |
| 282 | for (size_t i = 0; i < sizeof(user_euids)/sizeof(user_euids[0]); i++) { |
| 283 | struct user_euid user = user_euids[i]; |
| 284 | if (user.uid == uid) { |
| 285 | return user.euid; |
| 286 | } |
| 287 | } |
| 288 | |
| 289 | return uid; |
| 290 | } |
| 291 | |
Kenny Root | 4946890 | 2013-03-19 13:41:33 -0700 | [diff] [blame] | 292 | /** |
| 293 | * Returns true if the callingUid is allowed to interact in the targetUid's |
| 294 | * namespace. |
| 295 | */ |
| 296 | static bool is_granted_to(uid_t callingUid, uid_t targetUid) { |
| 297 | for (size_t i = 0; i < sizeof(user_euids)/sizeof(user_euids[0]); i++) { |
| 298 | struct user_euid user = user_euids[i]; |
| 299 | if (user.euid == callingUid && user.uid == targetUid) { |
| 300 | return true; |
| 301 | } |
| 302 | } |
| 303 | |
| 304 | return false; |
| 305 | } |
| 306 | |
Kenny Root | 007cb23 | 2014-07-30 16:59:42 -0700 | [diff] [blame] | 307 | /** |
| 308 | * Allow the system to perform some privileged tasks that have to do with |
| 309 | * system maintenance. This should not be used for any function that uses |
| 310 | * the keys in any way (e.g., signing). |
| 311 | */ |
| 312 | static bool is_self_or_system(uid_t callingUid, uid_t targetUid) { |
| 313 | return callingUid == targetUid || callingUid == AID_SYSTEM; |
| 314 | } |
| 315 | |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 316 | /* Here is the encoding of keys. This is necessary in order to allow arbitrary |
| 317 | * characters in keys. Characters in [0-~] are not encoded. Others are encoded |
| 318 | * into two bytes. The first byte is one of [+-.] which represents the first |
| 319 | * two bits of the character. The second byte encodes the rest of the bits into |
| 320 | * [0-o]. Therefore in the worst case the length of a key gets doubled. Note |
| 321 | * that Base64 cannot be used here due to the need of prefix match on keys. */ |
| 322 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 323 | static size_t encode_key_length(const android::String8& keyName) { |
| 324 | const uint8_t* in = reinterpret_cast<const uint8_t*>(keyName.string()); |
| 325 | size_t length = keyName.length(); |
| 326 | for (int i = length; i > 0; --i, ++in) { |
| 327 | if (*in < '0' || *in > '~') { |
| 328 | ++length; |
| 329 | } |
| 330 | } |
| 331 | return length; |
| 332 | } |
| 333 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 334 | static int encode_key(char* out, const android::String8& keyName) { |
| 335 | const uint8_t* in = reinterpret_cast<const uint8_t*>(keyName.string()); |
| 336 | size_t length = keyName.length(); |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 337 | for (int i = length; i > 0; --i, ++in, ++out) { |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 338 | if (*in < '0' || *in > '~') { |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 339 | *out = '+' + (*in >> 6); |
| 340 | *++out = '0' + (*in & 0x3F); |
| 341 | ++length; |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 342 | } else { |
| 343 | *out = *in; |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 344 | } |
| 345 | } |
| 346 | *out = '\0'; |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 347 | return length; |
| 348 | } |
| 349 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 350 | /* |
| 351 | * Converts from the "escaped" format on disk to actual name. |
| 352 | * This will be smaller than the input string. |
| 353 | * |
| 354 | * Characters that should combine with the next at the end will be truncated. |
| 355 | */ |
| 356 | static size_t decode_key_length(const char* in, size_t length) { |
| 357 | size_t outLength = 0; |
| 358 | |
| 359 | for (const char* end = in + length; in < end; in++) { |
| 360 | /* This combines with the next character. */ |
| 361 | if (*in < '0' || *in > '~') { |
| 362 | continue; |
| 363 | } |
| 364 | |
| 365 | outLength++; |
| 366 | } |
| 367 | return outLength; |
| 368 | } |
| 369 | |
| 370 | static void decode_key(char* out, const char* in, size_t length) { |
| 371 | for (const char* end = in + length; in < end; in++) { |
| 372 | if (*in < '0' || *in > '~') { |
| 373 | /* Truncate combining characters at the end. */ |
| 374 | if (in + 1 >= end) { |
| 375 | break; |
| 376 | } |
| 377 | |
| 378 | *out = (*in++ - '+') << 6; |
| 379 | *out++ |= (*in - '0') & 0x3F; |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 380 | } else { |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 381 | *out++ = *in; |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 382 | } |
| 383 | } |
| 384 | *out = '\0'; |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 385 | } |
| 386 | |
| 387 | static size_t readFully(int fd, uint8_t* data, size_t size) { |
| 388 | size_t remaining = size; |
| 389 | while (remaining > 0) { |
Kenny Root | 150ca93 | 2012-11-14 14:29:02 -0800 | [diff] [blame] | 390 | ssize_t n = TEMP_FAILURE_RETRY(read(fd, data, remaining)); |
Kenny Root | 5281edb | 2012-11-21 15:14:04 -0800 | [diff] [blame] | 391 | if (n <= 0) { |
Kenny Root | 150ca93 | 2012-11-14 14:29:02 -0800 | [diff] [blame] | 392 | return size - remaining; |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 393 | } |
| 394 | data += n; |
| 395 | remaining -= n; |
| 396 | } |
| 397 | return size; |
| 398 | } |
| 399 | |
| 400 | static size_t writeFully(int fd, uint8_t* data, size_t size) { |
| 401 | size_t remaining = size; |
| 402 | while (remaining > 0) { |
Kenny Root | 150ca93 | 2012-11-14 14:29:02 -0800 | [diff] [blame] | 403 | ssize_t n = TEMP_FAILURE_RETRY(write(fd, data, remaining)); |
| 404 | if (n < 0) { |
| 405 | ALOGW("write failed: %s", strerror(errno)); |
| 406 | return size - remaining; |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 407 | } |
| 408 | data += n; |
| 409 | remaining -= n; |
| 410 | } |
| 411 | return size; |
| 412 | } |
| 413 | |
| 414 | class Entropy { |
| 415 | public: |
| 416 | Entropy() : mRandom(-1) {} |
| 417 | ~Entropy() { |
Kenny Root | 150ca93 | 2012-11-14 14:29:02 -0800 | [diff] [blame] | 418 | if (mRandom >= 0) { |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 419 | close(mRandom); |
| 420 | } |
| 421 | } |
| 422 | |
| 423 | bool open() { |
| 424 | const char* randomDevice = "/dev/urandom"; |
Kenny Root | 150ca93 | 2012-11-14 14:29:02 -0800 | [diff] [blame] | 425 | mRandom = TEMP_FAILURE_RETRY(::open(randomDevice, O_RDONLY)); |
| 426 | if (mRandom < 0) { |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 427 | ALOGE("open: %s: %s", randomDevice, strerror(errno)); |
| 428 | return false; |
| 429 | } |
| 430 | return true; |
| 431 | } |
| 432 | |
Kenny Root | 5187818 | 2012-03-13 12:53:19 -0700 | [diff] [blame] | 433 | bool generate_random_data(uint8_t* data, size_t size) const { |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 434 | return (readFully(mRandom, data, size) == size); |
| 435 | } |
| 436 | |
| 437 | private: |
| 438 | int mRandom; |
| 439 | }; |
| 440 | |
| 441 | /* Here is the file format. There are two parts in blob.value, the secret and |
| 442 | * the description. The secret is stored in ciphertext, and its original size |
| 443 | * can be found in blob.length. The description is stored after the secret in |
| 444 | * plaintext, and its size is specified in blob.info. The total size of the two |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 445 | * parts must be no more than VALUE_SIZE bytes. The first field is the version, |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 446 | * the second is the blob's type, and the third byte is flags. Fields other |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 447 | * than blob.info, blob.length, and blob.value are modified by encryptBlob() |
| 448 | * and decryptBlob(). Thus they should not be accessed from outside. */ |
| 449 | |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 450 | /* ** Note to future implementors of encryption: ** |
| 451 | * Currently this is the construction: |
| 452 | * metadata || Enc(MD5(data) || data) |
| 453 | * |
| 454 | * This should be the construction used for encrypting if re-implementing: |
| 455 | * |
| 456 | * Derive independent keys for encryption and MAC: |
| 457 | * Kenc = AES_encrypt(masterKey, "Encrypt") |
| 458 | * Kmac = AES_encrypt(masterKey, "MAC") |
| 459 | * |
| 460 | * Store this: |
| 461 | * metadata || AES_CTR_encrypt(Kenc, rand_IV, data) || |
| 462 | * HMAC(Kmac, metadata || Enc(data)) |
| 463 | */ |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 464 | struct __attribute__((packed)) blob { |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 465 | uint8_t version; |
| 466 | uint8_t type; |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 467 | uint8_t flags; |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 468 | uint8_t info; |
| 469 | uint8_t vector[AES_BLOCK_SIZE]; |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 470 | uint8_t encrypted[0]; // Marks offset to encrypted data. |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 471 | uint8_t digest[MD5_DIGEST_LENGTH]; |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 472 | uint8_t digested[0]; // Marks offset to digested data. |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 473 | int32_t length; // in network byte order when encrypted |
| 474 | uint8_t value[VALUE_SIZE + AES_BLOCK_SIZE]; |
| 475 | }; |
| 476 | |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 477 | typedef enum { |
Kenny Root | d53bc92 | 2013-03-21 14:10:15 -0700 | [diff] [blame] | 478 | TYPE_ANY = 0, // meta type that matches anything |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 479 | TYPE_GENERIC = 1, |
| 480 | TYPE_MASTER_KEY = 2, |
| 481 | TYPE_KEY_PAIR = 3, |
| 482 | } BlobType; |
| 483 | |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 484 | static const uint8_t CURRENT_BLOB_VERSION = 2; |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 485 | |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 486 | class Blob { |
| 487 | public: |
Chad Brubaker | 7733532 | 2015-07-29 13:53:36 -0700 | [diff] [blame] | 488 | Blob(const uint8_t* value, size_t valueLength, const uint8_t* info, uint8_t infoLength, |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 489 | BlobType type) { |
Chad Brubaker | 2cbc107 | 2015-08-12 13:40:31 -0700 | [diff] [blame] | 490 | if (valueLength > VALUE_SIZE) { |
| 491 | valueLength = VALUE_SIZE; |
Chad Brubaker | 7733532 | 2015-07-29 13:53:36 -0700 | [diff] [blame] | 492 | ALOGW("Provided blob length too large"); |
| 493 | } |
Chad Brubaker | 2cbc107 | 2015-08-12 13:40:31 -0700 | [diff] [blame] | 494 | if (infoLength + valueLength > VALUE_SIZE) { |
| 495 | infoLength = VALUE_SIZE - valueLength; |
Chad Brubaker | 7733532 | 2015-07-29 13:53:36 -0700 | [diff] [blame] | 496 | ALOGW("Provided info length too large"); |
| 497 | } |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 498 | mBlob.length = valueLength; |
| 499 | memcpy(mBlob.value, value, valueLength); |
| 500 | |
| 501 | mBlob.info = infoLength; |
| 502 | memcpy(mBlob.value + valueLength, info, infoLength); |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 503 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 504 | mBlob.version = CURRENT_BLOB_VERSION; |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 505 | mBlob.type = uint8_t(type); |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 506 | |
Kenny Root | ee8068b | 2013-10-07 09:49:15 -0700 | [diff] [blame] | 507 | if (type == TYPE_MASTER_KEY) { |
| 508 | mBlob.flags = KEYSTORE_FLAG_ENCRYPTED; |
| 509 | } else { |
| 510 | mBlob.flags = KEYSTORE_FLAG_NONE; |
| 511 | } |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 512 | } |
| 513 | |
| 514 | Blob(blob b) { |
| 515 | mBlob = b; |
| 516 | } |
| 517 | |
| 518 | Blob() {} |
| 519 | |
Kenny Root | 5187818 | 2012-03-13 12:53:19 -0700 | [diff] [blame] | 520 | const uint8_t* getValue() const { |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 521 | return mBlob.value; |
| 522 | } |
| 523 | |
Kenny Root | 5187818 | 2012-03-13 12:53:19 -0700 | [diff] [blame] | 524 | int32_t getLength() const { |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 525 | return mBlob.length; |
| 526 | } |
| 527 | |
Kenny Root | 5187818 | 2012-03-13 12:53:19 -0700 | [diff] [blame] | 528 | const uint8_t* getInfo() const { |
| 529 | return mBlob.value + mBlob.length; |
| 530 | } |
| 531 | |
| 532 | uint8_t getInfoLength() const { |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 533 | return mBlob.info; |
| 534 | } |
| 535 | |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 536 | uint8_t getVersion() const { |
| 537 | return mBlob.version; |
| 538 | } |
| 539 | |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 540 | bool isEncrypted() const { |
| 541 | if (mBlob.version < 2) { |
| 542 | return true; |
| 543 | } |
| 544 | |
| 545 | return mBlob.flags & KEYSTORE_FLAG_ENCRYPTED; |
| 546 | } |
| 547 | |
| 548 | void setEncrypted(bool encrypted) { |
| 549 | if (encrypted) { |
| 550 | mBlob.flags |= KEYSTORE_FLAG_ENCRYPTED; |
| 551 | } else { |
| 552 | mBlob.flags &= ~KEYSTORE_FLAG_ENCRYPTED; |
| 553 | } |
| 554 | } |
| 555 | |
Kenny Root | 17208e0 | 2013-09-04 13:56:03 -0700 | [diff] [blame] | 556 | bool isFallback() const { |
| 557 | return mBlob.flags & KEYSTORE_FLAG_FALLBACK; |
| 558 | } |
| 559 | |
| 560 | void setFallback(bool fallback) { |
| 561 | if (fallback) { |
| 562 | mBlob.flags |= KEYSTORE_FLAG_FALLBACK; |
| 563 | } else { |
| 564 | mBlob.flags &= ~KEYSTORE_FLAG_FALLBACK; |
| 565 | } |
| 566 | } |
| 567 | |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 568 | void setVersion(uint8_t version) { |
| 569 | mBlob.version = version; |
| 570 | } |
| 571 | |
| 572 | BlobType getType() const { |
| 573 | return BlobType(mBlob.type); |
| 574 | } |
| 575 | |
| 576 | void setType(BlobType type) { |
| 577 | mBlob.type = uint8_t(type); |
| 578 | } |
| 579 | |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 580 | ResponseCode writeBlob(const char* filename, AES_KEY *aes_key, State state, Entropy* entropy) { |
| 581 | ALOGV("writing blob %s", filename); |
| 582 | if (isEncrypted()) { |
| 583 | if (state != STATE_NO_ERROR) { |
| 584 | ALOGD("couldn't insert encrypted blob while not unlocked"); |
| 585 | return LOCKED; |
| 586 | } |
| 587 | |
| 588 | if (!entropy->generate_random_data(mBlob.vector, AES_BLOCK_SIZE)) { |
| 589 | ALOGW("Could not read random data for: %s", filename); |
| 590 | return SYSTEM_ERROR; |
| 591 | } |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 592 | } |
| 593 | |
| 594 | // data includes the value and the value's length |
| 595 | size_t dataLength = mBlob.length + sizeof(mBlob.length); |
| 596 | // pad data to the AES_BLOCK_SIZE |
| 597 | size_t digestedLength = ((dataLength + AES_BLOCK_SIZE - 1) |
| 598 | / AES_BLOCK_SIZE * AES_BLOCK_SIZE); |
| 599 | // encrypted data includes the digest value |
| 600 | size_t encryptedLength = digestedLength + MD5_DIGEST_LENGTH; |
| 601 | // move info after space for padding |
| 602 | memmove(&mBlob.encrypted[encryptedLength], &mBlob.value[mBlob.length], mBlob.info); |
| 603 | // zero padding area |
| 604 | memset(mBlob.value + mBlob.length, 0, digestedLength - dataLength); |
| 605 | |
| 606 | mBlob.length = htonl(mBlob.length); |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 607 | |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 608 | if (isEncrypted()) { |
| 609 | MD5(mBlob.digested, digestedLength, mBlob.digest); |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 610 | |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 611 | uint8_t vector[AES_BLOCK_SIZE]; |
| 612 | memcpy(vector, mBlob.vector, AES_BLOCK_SIZE); |
| 613 | AES_cbc_encrypt(mBlob.encrypted, mBlob.encrypted, encryptedLength, |
| 614 | aes_key, vector, AES_ENCRYPT); |
| 615 | } |
| 616 | |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 617 | size_t headerLength = (mBlob.encrypted - (uint8_t*) &mBlob); |
| 618 | size_t fileLength = encryptedLength + headerLength + mBlob.info; |
| 619 | |
| 620 | const char* tmpFileName = ".tmp"; |
Kenny Root | 150ca93 | 2012-11-14 14:29:02 -0800 | [diff] [blame] | 621 | int out = TEMP_FAILURE_RETRY(open(tmpFileName, |
| 622 | O_WRONLY | O_TRUNC | O_CREAT, S_IRUSR | S_IWUSR)); |
| 623 | if (out < 0) { |
| 624 | ALOGW("could not open file: %s: %s", tmpFileName, strerror(errno)); |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 625 | return SYSTEM_ERROR; |
| 626 | } |
| 627 | size_t writtenBytes = writeFully(out, (uint8_t*) &mBlob, fileLength); |
| 628 | if (close(out) != 0) { |
| 629 | return SYSTEM_ERROR; |
| 630 | } |
| 631 | if (writtenBytes != fileLength) { |
Kenny Root | 150ca93 | 2012-11-14 14:29:02 -0800 | [diff] [blame] | 632 | ALOGW("blob not fully written %zu != %zu", writtenBytes, fileLength); |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 633 | unlink(tmpFileName); |
| 634 | return SYSTEM_ERROR; |
| 635 | } |
Kenny Root | 150ca93 | 2012-11-14 14:29:02 -0800 | [diff] [blame] | 636 | if (rename(tmpFileName, filename) == -1) { |
| 637 | ALOGW("could not rename blob to %s: %s", filename, strerror(errno)); |
| 638 | return SYSTEM_ERROR; |
| 639 | } |
| 640 | return NO_ERROR; |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 641 | } |
| 642 | |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 643 | ResponseCode readBlob(const char* filename, AES_KEY *aes_key, State state) { |
| 644 | ALOGV("reading blob %s", filename); |
Kenny Root | 150ca93 | 2012-11-14 14:29:02 -0800 | [diff] [blame] | 645 | int in = TEMP_FAILURE_RETRY(open(filename, O_RDONLY)); |
| 646 | if (in < 0) { |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 647 | return (errno == ENOENT) ? KEY_NOT_FOUND : SYSTEM_ERROR; |
| 648 | } |
| 649 | // fileLength may be less than sizeof(mBlob) since the in |
| 650 | // memory version has extra padding to tolerate rounding up to |
| 651 | // the AES_BLOCK_SIZE |
| 652 | size_t fileLength = readFully(in, (uint8_t*) &mBlob, sizeof(mBlob)); |
| 653 | if (close(in) != 0) { |
| 654 | return SYSTEM_ERROR; |
| 655 | } |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 656 | |
| 657 | if (isEncrypted() && (state != STATE_NO_ERROR)) { |
| 658 | return LOCKED; |
| 659 | } |
| 660 | |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 661 | size_t headerLength = (mBlob.encrypted - (uint8_t*) &mBlob); |
| 662 | if (fileLength < headerLength) { |
| 663 | return VALUE_CORRUPTED; |
| 664 | } |
| 665 | |
| 666 | ssize_t encryptedLength = fileLength - (headerLength + mBlob.info); |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 667 | if (encryptedLength < 0) { |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 668 | return VALUE_CORRUPTED; |
| 669 | } |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 670 | |
| 671 | ssize_t digestedLength; |
| 672 | if (isEncrypted()) { |
| 673 | if (encryptedLength % AES_BLOCK_SIZE != 0) { |
| 674 | return VALUE_CORRUPTED; |
| 675 | } |
| 676 | |
| 677 | AES_cbc_encrypt(mBlob.encrypted, mBlob.encrypted, encryptedLength, aes_key, |
| 678 | mBlob.vector, AES_DECRYPT); |
| 679 | digestedLength = encryptedLength - MD5_DIGEST_LENGTH; |
| 680 | uint8_t computedDigest[MD5_DIGEST_LENGTH]; |
| 681 | MD5(mBlob.digested, digestedLength, computedDigest); |
| 682 | if (memcmp(mBlob.digest, computedDigest, MD5_DIGEST_LENGTH) != 0) { |
| 683 | return VALUE_CORRUPTED; |
| 684 | } |
| 685 | } else { |
| 686 | digestedLength = encryptedLength; |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 687 | } |
| 688 | |
| 689 | ssize_t maxValueLength = digestedLength - sizeof(mBlob.length); |
| 690 | mBlob.length = ntohl(mBlob.length); |
| 691 | if (mBlob.length < 0 || mBlob.length > maxValueLength) { |
| 692 | return VALUE_CORRUPTED; |
| 693 | } |
| 694 | if (mBlob.info != 0) { |
| 695 | // move info from after padding to after data |
| 696 | memmove(&mBlob.value[mBlob.length], &mBlob.value[maxValueLength], mBlob.info); |
| 697 | } |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 698 | return ::NO_ERROR; |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 699 | } |
| 700 | |
| 701 | private: |
| 702 | struct blob mBlob; |
| 703 | }; |
| 704 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 705 | class UserState { |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 706 | public: |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 707 | UserState(uid_t userId) : mUserId(userId), mRetry(MAX_RETRY) { |
| 708 | asprintf(&mUserDir, "user_%u", mUserId); |
| 709 | asprintf(&mMasterKeyFile, "%s/.masterkey", mUserDir); |
| 710 | } |
| 711 | |
| 712 | ~UserState() { |
| 713 | free(mUserDir); |
| 714 | free(mMasterKeyFile); |
| 715 | } |
| 716 | |
| 717 | bool initialize() { |
| 718 | if ((mkdir(mUserDir, S_IRUSR | S_IWUSR | S_IXUSR) < 0) && (errno != EEXIST)) { |
| 719 | ALOGE("Could not create directory '%s'", mUserDir); |
| 720 | return false; |
| 721 | } |
| 722 | |
| 723 | if (access(mMasterKeyFile, R_OK) == 0) { |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 724 | setState(STATE_LOCKED); |
| 725 | } else { |
| 726 | setState(STATE_UNINITIALIZED); |
| 727 | } |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 728 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 729 | return true; |
| 730 | } |
| 731 | |
| 732 | uid_t getUserId() const { |
| 733 | return mUserId; |
| 734 | } |
| 735 | |
| 736 | const char* getUserDirName() const { |
| 737 | return mUserDir; |
| 738 | } |
| 739 | |
| 740 | const char* getMasterKeyFileName() const { |
| 741 | return mMasterKeyFile; |
| 742 | } |
| 743 | |
| 744 | void setState(State state) { |
| 745 | mState = state; |
| 746 | if (mState == STATE_NO_ERROR || mState == STATE_UNINITIALIZED) { |
| 747 | mRetry = MAX_RETRY; |
| 748 | } |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 749 | } |
| 750 | |
Kenny Root | 5187818 | 2012-03-13 12:53:19 -0700 | [diff] [blame] | 751 | State getState() const { |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 752 | return mState; |
| 753 | } |
| 754 | |
Kenny Root | 5187818 | 2012-03-13 12:53:19 -0700 | [diff] [blame] | 755 | int8_t getRetry() const { |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 756 | return mRetry; |
| 757 | } |
| 758 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 759 | void zeroizeMasterKeysInMemory() { |
| 760 | memset(mMasterKey, 0, sizeof(mMasterKey)); |
| 761 | memset(mSalt, 0, sizeof(mSalt)); |
| 762 | memset(&mMasterKeyEncryption, 0, sizeof(mMasterKeyEncryption)); |
| 763 | memset(&mMasterKeyDecryption, 0, sizeof(mMasterKeyDecryption)); |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 764 | } |
| 765 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 766 | ResponseCode initialize(const android::String8& pw, Entropy* entropy) { |
| 767 | if (!generateMasterKey(entropy)) { |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 768 | return SYSTEM_ERROR; |
| 769 | } |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 770 | ResponseCode response = writeMasterKey(pw, entropy); |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 771 | if (response != NO_ERROR) { |
| 772 | return response; |
| 773 | } |
| 774 | setupMasterKeys(); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 775 | return ::NO_ERROR; |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 776 | } |
| 777 | |
Robin Lee | 4e86575 | 2014-08-19 17:37:55 +0100 | [diff] [blame] | 778 | ResponseCode copyMasterKey(UserState* src) { |
| 779 | if (mState != STATE_UNINITIALIZED) { |
| 780 | return ::SYSTEM_ERROR; |
| 781 | } |
| 782 | if (src->getState() != STATE_NO_ERROR) { |
| 783 | return ::SYSTEM_ERROR; |
| 784 | } |
| 785 | memcpy(mMasterKey, src->mMasterKey, MASTER_KEY_SIZE_BYTES); |
| 786 | setupMasterKeys(); |
| 787 | return ::NO_ERROR; |
| 788 | } |
| 789 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 790 | ResponseCode writeMasterKey(const android::String8& pw, Entropy* entropy) { |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 791 | uint8_t passwordKey[MASTER_KEY_SIZE_BYTES]; |
| 792 | generateKeyFromPassword(passwordKey, MASTER_KEY_SIZE_BYTES, pw, mSalt); |
| 793 | AES_KEY passwordAesKey; |
| 794 | AES_set_encrypt_key(passwordKey, MASTER_KEY_SIZE_BITS, &passwordAesKey); |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 795 | Blob masterKeyBlob(mMasterKey, sizeof(mMasterKey), mSalt, sizeof(mSalt), TYPE_MASTER_KEY); |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 796 | return masterKeyBlob.writeBlob(mMasterKeyFile, &passwordAesKey, STATE_NO_ERROR, entropy); |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 797 | } |
| 798 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 799 | ResponseCode readMasterKey(const android::String8& pw, Entropy* entropy) { |
| 800 | int in = TEMP_FAILURE_RETRY(open(mMasterKeyFile, O_RDONLY)); |
Kenny Root | 150ca93 | 2012-11-14 14:29:02 -0800 | [diff] [blame] | 801 | if (in < 0) { |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 802 | return SYSTEM_ERROR; |
| 803 | } |
| 804 | |
| 805 | // we read the raw blob to just to get the salt to generate |
| 806 | // the AES key, then we create the Blob to use with decryptBlob |
| 807 | blob rawBlob; |
| 808 | size_t length = readFully(in, (uint8_t*) &rawBlob, sizeof(rawBlob)); |
| 809 | if (close(in) != 0) { |
| 810 | return SYSTEM_ERROR; |
| 811 | } |
| 812 | // find salt at EOF if present, otherwise we have an old file |
| 813 | uint8_t* salt; |
| 814 | if (length > SALT_SIZE && rawBlob.info == SALT_SIZE) { |
| 815 | salt = (uint8_t*) &rawBlob + length - SALT_SIZE; |
| 816 | } else { |
| 817 | salt = NULL; |
| 818 | } |
| 819 | uint8_t passwordKey[MASTER_KEY_SIZE_BYTES]; |
| 820 | generateKeyFromPassword(passwordKey, MASTER_KEY_SIZE_BYTES, pw, salt); |
| 821 | AES_KEY passwordAesKey; |
| 822 | AES_set_decrypt_key(passwordKey, MASTER_KEY_SIZE_BITS, &passwordAesKey); |
| 823 | Blob masterKeyBlob(rawBlob); |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 824 | ResponseCode response = masterKeyBlob.readBlob(mMasterKeyFile, &passwordAesKey, |
| 825 | STATE_NO_ERROR); |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 826 | if (response == SYSTEM_ERROR) { |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 827 | return response; |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 828 | } |
| 829 | if (response == NO_ERROR && masterKeyBlob.getLength() == MASTER_KEY_SIZE_BYTES) { |
| 830 | // if salt was missing, generate one and write a new master key file with the salt. |
| 831 | if (salt == NULL) { |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 832 | if (!generateSalt(entropy)) { |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 833 | return SYSTEM_ERROR; |
| 834 | } |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 835 | response = writeMasterKey(pw, entropy); |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 836 | } |
| 837 | if (response == NO_ERROR) { |
| 838 | memcpy(mMasterKey, masterKeyBlob.getValue(), MASTER_KEY_SIZE_BYTES); |
| 839 | setupMasterKeys(); |
| 840 | } |
| 841 | return response; |
| 842 | } |
| 843 | if (mRetry <= 0) { |
| 844 | reset(); |
| 845 | return UNINITIALIZED; |
| 846 | } |
| 847 | --mRetry; |
| 848 | switch (mRetry) { |
| 849 | case 0: return WRONG_PASSWORD_0; |
| 850 | case 1: return WRONG_PASSWORD_1; |
| 851 | case 2: return WRONG_PASSWORD_2; |
| 852 | case 3: return WRONG_PASSWORD_3; |
| 853 | default: return WRONG_PASSWORD_3; |
| 854 | } |
| 855 | } |
| 856 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 857 | AES_KEY* getEncryptionKey() { |
| 858 | return &mMasterKeyEncryption; |
| 859 | } |
| 860 | |
| 861 | AES_KEY* getDecryptionKey() { |
| 862 | return &mMasterKeyDecryption; |
| 863 | } |
| 864 | |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 865 | bool reset() { |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 866 | DIR* dir = opendir(getUserDirName()); |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 867 | if (!dir) { |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 868 | ALOGW("couldn't open user directory: %s", strerror(errno)); |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 869 | return false; |
| 870 | } |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 871 | |
| 872 | struct dirent* file; |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 873 | while ((file = readdir(dir)) != NULL) { |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 874 | // We only care about files. |
| 875 | if (file->d_type != DT_REG) { |
| 876 | continue; |
| 877 | } |
| 878 | |
| 879 | // Skip anything that starts with a "." |
Kenny Root | 931fac0 | 2014-07-30 16:39:40 -0700 | [diff] [blame] | 880 | if (file->d_name[0] == '.' && strcmp(".masterkey", file->d_name)) { |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 881 | continue; |
| 882 | } |
| 883 | |
| 884 | unlinkat(dirfd(dir), file->d_name, 0); |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 885 | } |
| 886 | closedir(dir); |
| 887 | return true; |
| 888 | } |
| 889 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 890 | private: |
| 891 | static const int MASTER_KEY_SIZE_BYTES = 16; |
| 892 | static const int MASTER_KEY_SIZE_BITS = MASTER_KEY_SIZE_BYTES * 8; |
| 893 | |
| 894 | static const int MAX_RETRY = 4; |
| 895 | static const size_t SALT_SIZE = 16; |
| 896 | |
| 897 | void generateKeyFromPassword(uint8_t* key, ssize_t keySize, const android::String8& pw, |
| 898 | uint8_t* salt) { |
| 899 | size_t saltSize; |
| 900 | if (salt != NULL) { |
| 901 | saltSize = SALT_SIZE; |
| 902 | } else { |
| 903 | // pre-gingerbread used this hardwired salt, readMasterKey will rewrite these when found |
| 904 | salt = (uint8_t*) "keystore"; |
| 905 | // sizeof = 9, not strlen = 8 |
| 906 | saltSize = sizeof("keystore"); |
| 907 | } |
| 908 | |
| 909 | PKCS5_PBKDF2_HMAC_SHA1(reinterpret_cast<const char*>(pw.string()), pw.length(), salt, |
| 910 | saltSize, 8192, keySize, key); |
| 911 | } |
| 912 | |
| 913 | bool generateSalt(Entropy* entropy) { |
| 914 | return entropy->generate_random_data(mSalt, sizeof(mSalt)); |
| 915 | } |
| 916 | |
| 917 | bool generateMasterKey(Entropy* entropy) { |
| 918 | if (!entropy->generate_random_data(mMasterKey, sizeof(mMasterKey))) { |
| 919 | return false; |
| 920 | } |
| 921 | if (!generateSalt(entropy)) { |
| 922 | return false; |
| 923 | } |
| 924 | return true; |
| 925 | } |
| 926 | |
| 927 | void setupMasterKeys() { |
| 928 | AES_set_encrypt_key(mMasterKey, MASTER_KEY_SIZE_BITS, &mMasterKeyEncryption); |
| 929 | AES_set_decrypt_key(mMasterKey, MASTER_KEY_SIZE_BITS, &mMasterKeyDecryption); |
| 930 | setState(STATE_NO_ERROR); |
| 931 | } |
| 932 | |
| 933 | uid_t mUserId; |
| 934 | |
| 935 | char* mUserDir; |
| 936 | char* mMasterKeyFile; |
| 937 | |
| 938 | State mState; |
| 939 | int8_t mRetry; |
| 940 | |
| 941 | uint8_t mMasterKey[MASTER_KEY_SIZE_BYTES]; |
| 942 | uint8_t mSalt[SALT_SIZE]; |
| 943 | |
| 944 | AES_KEY mMasterKeyEncryption; |
| 945 | AES_KEY mMasterKeyDecryption; |
| 946 | }; |
| 947 | |
| 948 | typedef struct { |
| 949 | uint32_t uid; |
| 950 | const uint8_t* filename; |
| 951 | } grant_t; |
| 952 | |
| 953 | class KeyStore { |
| 954 | public: |
| 955 | KeyStore(Entropy* entropy, keymaster_device_t* device) |
| 956 | : mEntropy(entropy) |
| 957 | , mDevice(device) |
| 958 | { |
| 959 | memset(&mMetaData, '\0', sizeof(mMetaData)); |
| 960 | } |
| 961 | |
| 962 | ~KeyStore() { |
| 963 | for (android::Vector<grant_t*>::iterator it(mGrants.begin()); |
| 964 | it != mGrants.end(); it++) { |
| 965 | delete *it; |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 966 | } |
haitao fang | c35d4eb | 2013-12-06 11:34:49 +0800 | [diff] [blame] | 967 | mGrants.clear(); |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 968 | |
| 969 | for (android::Vector<UserState*>::iterator it(mMasterKeys.begin()); |
| 970 | it != mMasterKeys.end(); it++) { |
| 971 | delete *it; |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 972 | } |
haitao fang | c35d4eb | 2013-12-06 11:34:49 +0800 | [diff] [blame] | 973 | mMasterKeys.clear(); |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 974 | } |
| 975 | |
| 976 | keymaster_device_t* getDevice() const { |
| 977 | return mDevice; |
| 978 | } |
| 979 | |
| 980 | ResponseCode initialize() { |
| 981 | readMetaData(); |
| 982 | if (upgradeKeystore()) { |
| 983 | writeMetaData(); |
| 984 | } |
| 985 | |
| 986 | return ::NO_ERROR; |
| 987 | } |
| 988 | |
| 989 | State getState(uid_t uid) { |
| 990 | return getUserState(uid)->getState(); |
| 991 | } |
| 992 | |
| 993 | ResponseCode initializeUser(const android::String8& pw, uid_t uid) { |
| 994 | UserState* userState = getUserState(uid); |
| 995 | return userState->initialize(pw, mEntropy); |
| 996 | } |
| 997 | |
Robin Lee | 4e86575 | 2014-08-19 17:37:55 +0100 | [diff] [blame] | 998 | ResponseCode copyMasterKey(uid_t src, uid_t uid) { |
| 999 | UserState *userState = getUserState(uid); |
| 1000 | UserState *initState = getUserState(src); |
| 1001 | return userState->copyMasterKey(initState); |
| 1002 | } |
| 1003 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1004 | ResponseCode writeMasterKey(const android::String8& pw, uid_t uid) { |
Robin Lee | 50122db | 2014-08-12 17:31:40 +0100 | [diff] [blame] | 1005 | UserState* userState = getUserState(uid); |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1006 | return userState->writeMasterKey(pw, mEntropy); |
| 1007 | } |
| 1008 | |
| 1009 | ResponseCode readMasterKey(const android::String8& pw, uid_t uid) { |
Robin Lee | 50122db | 2014-08-12 17:31:40 +0100 | [diff] [blame] | 1010 | UserState* userState = getUserState(uid); |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1011 | return userState->readMasterKey(pw, mEntropy); |
| 1012 | } |
| 1013 | |
| 1014 | android::String8 getKeyName(const android::String8& keyName) { |
Douglas Leung | a77e809 | 2013-06-13 16:34:43 -0700 | [diff] [blame] | 1015 | char encoded[encode_key_length(keyName) + 1]; // add 1 for null char |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1016 | encode_key(encoded, keyName); |
| 1017 | return android::String8(encoded); |
| 1018 | } |
| 1019 | |
| 1020 | android::String8 getKeyNameForUid(const android::String8& keyName, uid_t uid) { |
Douglas Leung | a77e809 | 2013-06-13 16:34:43 -0700 | [diff] [blame] | 1021 | char encoded[encode_key_length(keyName) + 1]; // add 1 for null char |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1022 | encode_key(encoded, keyName); |
| 1023 | return android::String8::format("%u_%s", uid, encoded); |
| 1024 | } |
| 1025 | |
| 1026 | android::String8 getKeyNameForUidWithDir(const android::String8& keyName, uid_t uid) { |
Douglas Leung | a77e809 | 2013-06-13 16:34:43 -0700 | [diff] [blame] | 1027 | char encoded[encode_key_length(keyName) + 1]; // add 1 for null char |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1028 | encode_key(encoded, keyName); |
| 1029 | return android::String8::format("%s/%u_%s", getUserState(uid)->getUserDirName(), uid, |
| 1030 | encoded); |
| 1031 | } |
| 1032 | |
| 1033 | bool reset(uid_t uid) { |
Robin Lee | 4b84fdc | 2014-09-24 11:56:57 +0100 | [diff] [blame] | 1034 | android::String8 prefix(""); |
| 1035 | android::Vector<android::String16> aliases; |
| 1036 | if (saw(prefix, &aliases, uid) != ::NO_ERROR) { |
| 1037 | return ::SYSTEM_ERROR; |
| 1038 | } |
| 1039 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1040 | UserState* userState = getUserState(uid); |
Robin Lee | 4b84fdc | 2014-09-24 11:56:57 +0100 | [diff] [blame] | 1041 | for (uint32_t i = 0; i < aliases.size(); i++) { |
| 1042 | android::String8 filename(aliases[i]); |
| 1043 | filename = android::String8::format("%s/%s", userState->getUserDirName(), |
| 1044 | getKeyName(filename).string()); |
| 1045 | del(filename, ::TYPE_ANY, uid); |
| 1046 | } |
| 1047 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1048 | userState->zeroizeMasterKeysInMemory(); |
| 1049 | userState->setState(STATE_UNINITIALIZED); |
| 1050 | return userState->reset(); |
| 1051 | } |
| 1052 | |
| 1053 | bool isEmpty(uid_t uid) const { |
| 1054 | const UserState* userState = getUserState(uid); |
Kenny Root | 31e2746 | 2014-09-10 11:28:03 -0700 | [diff] [blame] | 1055 | if (userState == NULL || userState->getState() == STATE_UNINITIALIZED) { |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1056 | return true; |
| 1057 | } |
| 1058 | |
| 1059 | DIR* dir = opendir(userState->getUserDirName()); |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 1060 | if (!dir) { |
| 1061 | return true; |
| 1062 | } |
Kenny Root | 31e2746 | 2014-09-10 11:28:03 -0700 | [diff] [blame] | 1063 | |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 1064 | bool result = true; |
Kenny Root | 31e2746 | 2014-09-10 11:28:03 -0700 | [diff] [blame] | 1065 | struct dirent* file; |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 1066 | while ((file = readdir(dir)) != NULL) { |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1067 | // We only care about files. |
| 1068 | if (file->d_type != DT_REG) { |
| 1069 | continue; |
| 1070 | } |
| 1071 | |
| 1072 | // Skip anything that starts with a "." |
| 1073 | if (file->d_name[0] == '.') { |
| 1074 | continue; |
| 1075 | } |
| 1076 | |
Kenny Root | 31e2746 | 2014-09-10 11:28:03 -0700 | [diff] [blame] | 1077 | result = false; |
| 1078 | break; |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 1079 | } |
| 1080 | closedir(dir); |
| 1081 | return result; |
| 1082 | } |
| 1083 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1084 | void lock(uid_t uid) { |
| 1085 | UserState* userState = getUserState(uid); |
| 1086 | userState->zeroizeMasterKeysInMemory(); |
| 1087 | userState->setState(STATE_LOCKED); |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 1088 | } |
| 1089 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1090 | ResponseCode get(const char* filename, Blob* keyBlob, const BlobType type, uid_t uid) { |
| 1091 | UserState* userState = getUserState(uid); |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 1092 | ResponseCode rc = keyBlob->readBlob(filename, userState->getDecryptionKey(), |
| 1093 | userState->getState()); |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 1094 | if (rc != NO_ERROR) { |
| 1095 | return rc; |
| 1096 | } |
| 1097 | |
| 1098 | const uint8_t version = keyBlob->getVersion(); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1099 | if (version < CURRENT_BLOB_VERSION) { |
Kenny Root | cfeae07 | 2013-04-04 08:39:57 -0700 | [diff] [blame] | 1100 | /* If we upgrade the key, we need to write it to disk again. Then |
| 1101 | * it must be read it again since the blob is encrypted each time |
| 1102 | * it's written. |
| 1103 | */ |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1104 | if (upgradeBlob(filename, keyBlob, version, type, uid)) { |
| 1105 | if ((rc = this->put(filename, keyBlob, uid)) != NO_ERROR |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 1106 | || (rc = keyBlob->readBlob(filename, userState->getDecryptionKey(), |
| 1107 | userState->getState())) != NO_ERROR) { |
Kenny Root | cfeae07 | 2013-04-04 08:39:57 -0700 | [diff] [blame] | 1108 | return rc; |
| 1109 | } |
| 1110 | } |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 1111 | } |
| 1112 | |
Kenny Root | 17208e0 | 2013-09-04 13:56:03 -0700 | [diff] [blame] | 1113 | /* |
| 1114 | * This will upgrade software-backed keys to hardware-backed keys when |
| 1115 | * the HAL for the device supports the newer key types. |
| 1116 | */ |
| 1117 | if (rc == NO_ERROR && type == TYPE_KEY_PAIR |
| 1118 | && mDevice->common.module->module_api_version >= KEYMASTER_MODULE_API_VERSION_0_2 |
| 1119 | && keyBlob->isFallback()) { |
| 1120 | ResponseCode imported = importKey(keyBlob->getValue(), keyBlob->getLength(), filename, |
| 1121 | uid, keyBlob->isEncrypted() ? KEYSTORE_FLAG_ENCRYPTED : KEYSTORE_FLAG_NONE); |
| 1122 | |
| 1123 | // The HAL allowed the import, reget the key to have the "fresh" |
| 1124 | // version. |
| 1125 | if (imported == NO_ERROR) { |
| 1126 | rc = get(filename, keyBlob, TYPE_KEY_PAIR, uid); |
| 1127 | } |
| 1128 | } |
| 1129 | |
Kenny Root | d53bc92 | 2013-03-21 14:10:15 -0700 | [diff] [blame] | 1130 | if (type != TYPE_ANY && keyBlob->getType() != type) { |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 1131 | ALOGW("key found but type doesn't match: %d vs %d", keyBlob->getType(), type); |
| 1132 | return KEY_NOT_FOUND; |
| 1133 | } |
| 1134 | |
| 1135 | return rc; |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 1136 | } |
| 1137 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1138 | ResponseCode put(const char* filename, Blob* keyBlob, uid_t uid) { |
| 1139 | UserState* userState = getUserState(uid); |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 1140 | return keyBlob->writeBlob(filename, userState->getEncryptionKey(), userState->getState(), |
| 1141 | mEntropy); |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 1142 | } |
| 1143 | |
Robin Lee | 4b84fdc | 2014-09-24 11:56:57 +0100 | [diff] [blame] | 1144 | ResponseCode del(const char *filename, const BlobType type, uid_t uid) { |
| 1145 | Blob keyBlob; |
| 1146 | ResponseCode rc = get(filename, &keyBlob, type, uid); |
| 1147 | if (rc != ::NO_ERROR) { |
| 1148 | return rc; |
| 1149 | } |
| 1150 | |
| 1151 | if (keyBlob.getType() == ::TYPE_KEY_PAIR) { |
| 1152 | // A device doesn't have to implement delete_keypair. |
| 1153 | if (mDevice->delete_keypair != NULL && !keyBlob.isFallback()) { |
| 1154 | if (mDevice->delete_keypair(mDevice, keyBlob.getValue(), keyBlob.getLength())) { |
| 1155 | rc = ::SYSTEM_ERROR; |
| 1156 | } |
| 1157 | } |
| 1158 | } |
| 1159 | if (rc != ::NO_ERROR) { |
| 1160 | return rc; |
| 1161 | } |
| 1162 | |
| 1163 | return (unlink(filename) && errno != ENOENT) ? ::SYSTEM_ERROR : ::NO_ERROR; |
| 1164 | } |
| 1165 | |
| 1166 | ResponseCode saw(const android::String8& prefix, android::Vector<android::String16> *matches, |
| 1167 | uid_t uid) { |
| 1168 | |
| 1169 | UserState* userState = getUserState(uid); |
| 1170 | size_t n = prefix.length(); |
| 1171 | |
| 1172 | DIR* dir = opendir(userState->getUserDirName()); |
| 1173 | if (!dir) { |
| 1174 | ALOGW("can't open directory for user: %s", strerror(errno)); |
| 1175 | return ::SYSTEM_ERROR; |
| 1176 | } |
| 1177 | |
| 1178 | struct dirent* file; |
| 1179 | while ((file = readdir(dir)) != NULL) { |
| 1180 | // We only care about files. |
| 1181 | if (file->d_type != DT_REG) { |
| 1182 | continue; |
| 1183 | } |
| 1184 | |
| 1185 | // Skip anything that starts with a "." |
| 1186 | if (file->d_name[0] == '.') { |
| 1187 | continue; |
| 1188 | } |
| 1189 | |
| 1190 | if (!strncmp(prefix.string(), file->d_name, n)) { |
| 1191 | const char* p = &file->d_name[n]; |
| 1192 | size_t plen = strlen(p); |
| 1193 | |
| 1194 | size_t extra = decode_key_length(p, plen); |
| 1195 | char *match = (char*) malloc(extra + 1); |
| 1196 | if (match != NULL) { |
| 1197 | decode_key(match, p, plen); |
| 1198 | matches->push(android::String16(match, extra)); |
| 1199 | free(match); |
| 1200 | } else { |
| 1201 | ALOGW("could not allocate match of size %zd", extra); |
| 1202 | } |
| 1203 | } |
| 1204 | } |
| 1205 | closedir(dir); |
| 1206 | return ::NO_ERROR; |
| 1207 | } |
| 1208 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1209 | void addGrant(const char* filename, uid_t granteeUid) { |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1210 | const grant_t* existing = getGrant(filename, granteeUid); |
| 1211 | if (existing == NULL) { |
| 1212 | grant_t* grant = new grant_t; |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1213 | grant->uid = granteeUid; |
Brian Carlstrom | a8c703d | 2012-07-17 14:43:46 -0700 | [diff] [blame] | 1214 | grant->filename = reinterpret_cast<const uint8_t*>(strdup(filename)); |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1215 | mGrants.add(grant); |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1216 | } |
| 1217 | } |
| 1218 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1219 | bool removeGrant(const char* filename, uid_t granteeUid) { |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1220 | for (android::Vector<grant_t*>::iterator it(mGrants.begin()); |
| 1221 | it != mGrants.end(); it++) { |
| 1222 | grant_t* grant = *it; |
| 1223 | if (grant->uid == granteeUid |
| 1224 | && !strcmp(reinterpret_cast<const char*>(grant->filename), filename)) { |
| 1225 | mGrants.erase(it); |
| 1226 | return true; |
| 1227 | } |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1228 | } |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1229 | return false; |
| 1230 | } |
| 1231 | |
Brian Carlstrom | a8c703d | 2012-07-17 14:43:46 -0700 | [diff] [blame] | 1232 | bool hasGrant(const char* filename, const uid_t uid) const { |
| 1233 | return getGrant(filename, uid) != NULL; |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1234 | } |
| 1235 | |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 1236 | ResponseCode importKey(const uint8_t* key, size_t keyLen, const char* filename, uid_t uid, |
| 1237 | int32_t flags) { |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 1238 | uint8_t* data; |
| 1239 | size_t dataLength; |
| 1240 | int rc; |
| 1241 | |
| 1242 | if (mDevice->import_keypair == NULL) { |
| 1243 | ALOGE("Keymaster doesn't support import!"); |
| 1244 | return SYSTEM_ERROR; |
| 1245 | } |
| 1246 | |
Kenny Root | 17208e0 | 2013-09-04 13:56:03 -0700 | [diff] [blame] | 1247 | bool isFallback = false; |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1248 | rc = mDevice->import_keypair(mDevice, key, keyLen, &data, &dataLength); |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 1249 | if (rc) { |
Kenny Root | a39da5a | 2014-09-25 13:07:24 -0700 | [diff] [blame] | 1250 | /* |
| 1251 | * Maybe the device doesn't support this type of key. Try to use the |
| 1252 | * software fallback keymaster implementation. This is a little bit |
| 1253 | * lazier than checking the PKCS#8 key type, but the software |
| 1254 | * implementation will do that anyway. |
| 1255 | */ |
| 1256 | rc = openssl_import_keypair(mDevice, key, keyLen, &data, &dataLength); |
| 1257 | isFallback = true; |
Kenny Root | 17208e0 | 2013-09-04 13:56:03 -0700 | [diff] [blame] | 1258 | |
| 1259 | if (rc) { |
| 1260 | ALOGE("Error while importing keypair: %d", rc); |
| 1261 | return SYSTEM_ERROR; |
| 1262 | } |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 1263 | } |
| 1264 | |
| 1265 | Blob keyBlob(data, dataLength, NULL, 0, TYPE_KEY_PAIR); |
| 1266 | free(data); |
| 1267 | |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 1268 | keyBlob.setEncrypted(flags & KEYSTORE_FLAG_ENCRYPTED); |
Kenny Root | 17208e0 | 2013-09-04 13:56:03 -0700 | [diff] [blame] | 1269 | keyBlob.setFallback(isFallback); |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 1270 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1271 | return put(filename, &keyBlob, uid); |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 1272 | } |
| 1273 | |
Kenny Root | 1b0e393 | 2013-09-05 13:06:32 -0700 | [diff] [blame] | 1274 | bool isHardwareBacked(const android::String16& keyType) const { |
| 1275 | if (mDevice == NULL) { |
| 1276 | ALOGW("can't get keymaster device"); |
| 1277 | return false; |
| 1278 | } |
| 1279 | |
| 1280 | if (sRSAKeyType == keyType) { |
| 1281 | return (mDevice->flags & KEYMASTER_SOFTWARE_ONLY) == 0; |
| 1282 | } else { |
| 1283 | return (mDevice->flags & KEYMASTER_SOFTWARE_ONLY) == 0 |
| 1284 | && (mDevice->common.module->module_api_version |
| 1285 | >= KEYMASTER_MODULE_API_VERSION_0_2); |
| 1286 | } |
Kenny Root | 8ddf35a | 2013-03-29 11:15:50 -0700 | [diff] [blame] | 1287 | } |
| 1288 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1289 | ResponseCode getKeyForName(Blob* keyBlob, const android::String8& keyName, const uid_t uid, |
| 1290 | const BlobType type) { |
Kenny Root | 86b16e8 | 2013-09-09 11:15:54 -0700 | [diff] [blame] | 1291 | android::String8 filepath8(getKeyNameForUidWithDir(keyName, uid)); |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1292 | |
| 1293 | ResponseCode responseCode = get(filepath8.string(), keyBlob, type, uid); |
| 1294 | if (responseCode == NO_ERROR) { |
| 1295 | return responseCode; |
| 1296 | } |
| 1297 | |
| 1298 | // If this is one of the legacy UID->UID mappings, use it. |
| 1299 | uid_t euid = get_keystore_euid(uid); |
| 1300 | if (euid != uid) { |
Kenny Root | 86b16e8 | 2013-09-09 11:15:54 -0700 | [diff] [blame] | 1301 | filepath8 = getKeyNameForUidWithDir(keyName, euid); |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1302 | responseCode = get(filepath8.string(), keyBlob, type, uid); |
| 1303 | if (responseCode == NO_ERROR) { |
| 1304 | return responseCode; |
| 1305 | } |
| 1306 | } |
| 1307 | |
| 1308 | // They might be using a granted key. |
Kenny Root | 86b16e8 | 2013-09-09 11:15:54 -0700 | [diff] [blame] | 1309 | android::String8 filename8 = getKeyName(keyName); |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1310 | char* end; |
Kenny Root | 86b16e8 | 2013-09-09 11:15:54 -0700 | [diff] [blame] | 1311 | strtoul(filename8.string(), &end, 10); |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1312 | if (end[0] != '_' || end[1] == 0) { |
| 1313 | return KEY_NOT_FOUND; |
| 1314 | } |
Kenny Root | 86b16e8 | 2013-09-09 11:15:54 -0700 | [diff] [blame] | 1315 | filepath8 = android::String8::format("%s/%s", getUserState(uid)->getUserDirName(), |
| 1316 | filename8.string()); |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1317 | if (!hasGrant(filepath8.string(), uid)) { |
| 1318 | return responseCode; |
| 1319 | } |
| 1320 | |
| 1321 | // It is a granted key. Try to load it. |
| 1322 | return get(filepath8.string(), keyBlob, type, uid); |
| 1323 | } |
| 1324 | |
| 1325 | /** |
| 1326 | * Returns any existing UserState or creates it if it doesn't exist. |
| 1327 | */ |
| 1328 | UserState* getUserState(uid_t uid) { |
| 1329 | uid_t userId = get_user_id(uid); |
| 1330 | |
| 1331 | for (android::Vector<UserState*>::iterator it(mMasterKeys.begin()); |
| 1332 | it != mMasterKeys.end(); it++) { |
| 1333 | UserState* state = *it; |
| 1334 | if (state->getUserId() == userId) { |
| 1335 | return state; |
| 1336 | } |
| 1337 | } |
| 1338 | |
| 1339 | UserState* userState = new UserState(userId); |
| 1340 | if (!userState->initialize()) { |
| 1341 | /* There's not much we can do if initialization fails. Trying to |
| 1342 | * unlock the keystore for that user will fail as well, so any |
| 1343 | * subsequent request for this user will just return SYSTEM_ERROR. |
| 1344 | */ |
| 1345 | ALOGE("User initialization failed for %u; subsuquent operations will fail", userId); |
| 1346 | } |
| 1347 | mMasterKeys.add(userState); |
| 1348 | return userState; |
| 1349 | } |
| 1350 | |
| 1351 | /** |
| 1352 | * Returns NULL if the UserState doesn't already exist. |
| 1353 | */ |
| 1354 | const UserState* getUserState(uid_t uid) const { |
| 1355 | uid_t userId = get_user_id(uid); |
| 1356 | |
| 1357 | for (android::Vector<UserState*>::const_iterator it(mMasterKeys.begin()); |
| 1358 | it != mMasterKeys.end(); it++) { |
| 1359 | UserState* state = *it; |
| 1360 | if (state->getUserId() == userId) { |
| 1361 | return state; |
| 1362 | } |
| 1363 | } |
| 1364 | |
| 1365 | return NULL; |
| 1366 | } |
| 1367 | |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 1368 | private: |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1369 | static const char* sOldMasterKey; |
| 1370 | static const char* sMetaDataFile; |
Kenny Root | 1b0e393 | 2013-09-05 13:06:32 -0700 | [diff] [blame] | 1371 | static const android::String16 sRSAKeyType; |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 1372 | Entropy* mEntropy; |
| 1373 | |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1374 | keymaster_device_t* mDevice; |
| 1375 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1376 | android::Vector<UserState*> mMasterKeys; |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 1377 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1378 | android::Vector<grant_t*> mGrants; |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 1379 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1380 | typedef struct { |
| 1381 | uint32_t version; |
| 1382 | } keystore_metadata_t; |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 1383 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1384 | keystore_metadata_t mMetaData; |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1385 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1386 | const grant_t* getGrant(const char* filename, uid_t uid) const { |
| 1387 | for (android::Vector<grant_t*>::const_iterator it(mGrants.begin()); |
| 1388 | it != mGrants.end(); it++) { |
| 1389 | grant_t* grant = *it; |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1390 | if (grant->uid == uid |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1391 | && !strcmp(reinterpret_cast<const char*>(grant->filename), filename)) { |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1392 | return grant; |
| 1393 | } |
| 1394 | } |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1395 | return NULL; |
| 1396 | } |
| 1397 | |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 1398 | /** |
| 1399 | * Upgrade code. This will upgrade the key from the current version |
| 1400 | * to whatever is newest. |
| 1401 | */ |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1402 | bool upgradeBlob(const char* filename, Blob* blob, const uint8_t oldVersion, |
| 1403 | const BlobType type, uid_t uid) { |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 1404 | bool updated = false; |
| 1405 | uint8_t version = oldVersion; |
| 1406 | |
| 1407 | /* From V0 -> V1: All old types were unknown */ |
| 1408 | if (version == 0) { |
| 1409 | ALOGV("upgrading to version 1 and setting type %d", type); |
| 1410 | |
| 1411 | blob->setType(type); |
| 1412 | if (type == TYPE_KEY_PAIR) { |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1413 | importBlobAsKey(blob, filename, uid); |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 1414 | } |
| 1415 | version = 1; |
| 1416 | updated = true; |
| 1417 | } |
| 1418 | |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 1419 | /* From V1 -> V2: All old keys were encrypted */ |
| 1420 | if (version == 1) { |
| 1421 | ALOGV("upgrading to version 2"); |
| 1422 | |
| 1423 | blob->setEncrypted(true); |
| 1424 | version = 2; |
| 1425 | updated = true; |
| 1426 | } |
| 1427 | |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 1428 | /* |
| 1429 | * If we've updated, set the key blob to the right version |
| 1430 | * and write it. |
Kenny Root | cfeae07 | 2013-04-04 08:39:57 -0700 | [diff] [blame] | 1431 | */ |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 1432 | if (updated) { |
| 1433 | ALOGV("updated and writing file %s", filename); |
| 1434 | blob->setVersion(version); |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 1435 | } |
Kenny Root | cfeae07 | 2013-04-04 08:39:57 -0700 | [diff] [blame] | 1436 | |
| 1437 | return updated; |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 1438 | } |
| 1439 | |
| 1440 | /** |
| 1441 | * Takes a blob that is an PEM-encoded RSA key as a byte array and |
| 1442 | * converts it to a DER-encoded PKCS#8 for import into a keymaster. |
| 1443 | * Then it overwrites the original blob with the new blob |
| 1444 | * format that is returned from the keymaster. |
| 1445 | */ |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1446 | ResponseCode importBlobAsKey(Blob* blob, const char* filename, uid_t uid) { |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 1447 | // We won't even write to the blob directly with this BIO, so const_cast is okay. |
| 1448 | Unique_BIO b(BIO_new_mem_buf(const_cast<uint8_t*>(blob->getValue()), blob->getLength())); |
| 1449 | if (b.get() == NULL) { |
| 1450 | ALOGE("Problem instantiating BIO"); |
| 1451 | return SYSTEM_ERROR; |
| 1452 | } |
| 1453 | |
| 1454 | Unique_EVP_PKEY pkey(PEM_read_bio_PrivateKey(b.get(), NULL, NULL, NULL)); |
| 1455 | if (pkey.get() == NULL) { |
| 1456 | ALOGE("Couldn't read old PEM file"); |
| 1457 | return SYSTEM_ERROR; |
| 1458 | } |
| 1459 | |
| 1460 | Unique_PKCS8_PRIV_KEY_INFO pkcs8(EVP_PKEY2PKCS8(pkey.get())); |
| 1461 | int len = i2d_PKCS8_PRIV_KEY_INFO(pkcs8.get(), NULL); |
| 1462 | if (len < 0) { |
| 1463 | ALOGE("Couldn't measure PKCS#8 length"); |
| 1464 | return SYSTEM_ERROR; |
| 1465 | } |
| 1466 | |
Kenny Root | 70c9889 | 2013-02-07 09:10:36 -0800 | [diff] [blame] | 1467 | UniquePtr<unsigned char[]> pkcs8key(new unsigned char[len]); |
| 1468 | uint8_t* tmp = pkcs8key.get(); |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 1469 | if (i2d_PKCS8_PRIV_KEY_INFO(pkcs8.get(), &tmp) != len) { |
| 1470 | ALOGE("Couldn't convert to PKCS#8"); |
| 1471 | return SYSTEM_ERROR; |
| 1472 | } |
| 1473 | |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 1474 | ResponseCode rc = importKey(pkcs8key.get(), len, filename, uid, |
| 1475 | blob->isEncrypted() ? KEYSTORE_FLAG_ENCRYPTED : KEYSTORE_FLAG_NONE); |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 1476 | if (rc != NO_ERROR) { |
| 1477 | return rc; |
| 1478 | } |
| 1479 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1480 | return get(filename, blob, TYPE_KEY_PAIR, uid); |
| 1481 | } |
| 1482 | |
| 1483 | void readMetaData() { |
| 1484 | int in = TEMP_FAILURE_RETRY(open(sMetaDataFile, O_RDONLY)); |
| 1485 | if (in < 0) { |
| 1486 | return; |
| 1487 | } |
| 1488 | size_t fileLength = readFully(in, (uint8_t*) &mMetaData, sizeof(mMetaData)); |
| 1489 | if (fileLength != sizeof(mMetaData)) { |
| 1490 | ALOGI("Metadata file is %zd bytes (%zd experted); upgrade?", fileLength, |
| 1491 | sizeof(mMetaData)); |
| 1492 | } |
| 1493 | close(in); |
| 1494 | } |
| 1495 | |
| 1496 | void writeMetaData() { |
| 1497 | const char* tmpFileName = ".metadata.tmp"; |
| 1498 | int out = TEMP_FAILURE_RETRY(open(tmpFileName, |
| 1499 | O_WRONLY | O_TRUNC | O_CREAT, S_IRUSR | S_IWUSR)); |
| 1500 | if (out < 0) { |
| 1501 | ALOGE("couldn't write metadata file: %s", strerror(errno)); |
| 1502 | return; |
| 1503 | } |
| 1504 | size_t fileLength = writeFully(out, (uint8_t*) &mMetaData, sizeof(mMetaData)); |
| 1505 | if (fileLength != sizeof(mMetaData)) { |
| 1506 | ALOGI("Could only write %zd bytes to metadata file (%zd expected)", fileLength, |
| 1507 | sizeof(mMetaData)); |
| 1508 | } |
| 1509 | close(out); |
| 1510 | rename(tmpFileName, sMetaDataFile); |
| 1511 | } |
| 1512 | |
| 1513 | bool upgradeKeystore() { |
| 1514 | bool upgraded = false; |
| 1515 | |
| 1516 | if (mMetaData.version == 0) { |
| 1517 | UserState* userState = getUserState(0); |
| 1518 | |
| 1519 | // Initialize first so the directory is made. |
| 1520 | userState->initialize(); |
| 1521 | |
| 1522 | // Migrate the old .masterkey file to user 0. |
| 1523 | if (access(sOldMasterKey, R_OK) == 0) { |
| 1524 | if (rename(sOldMasterKey, userState->getMasterKeyFileName()) < 0) { |
| 1525 | ALOGE("couldn't migrate old masterkey: %s", strerror(errno)); |
| 1526 | return false; |
| 1527 | } |
| 1528 | } |
| 1529 | |
| 1530 | // Initialize again in case we had a key. |
| 1531 | userState->initialize(); |
| 1532 | |
| 1533 | // Try to migrate existing keys. |
| 1534 | DIR* dir = opendir("."); |
| 1535 | if (!dir) { |
| 1536 | // Give up now; maybe we can upgrade later. |
| 1537 | ALOGE("couldn't open keystore's directory; something is wrong"); |
| 1538 | return false; |
| 1539 | } |
| 1540 | |
| 1541 | struct dirent* file; |
| 1542 | while ((file = readdir(dir)) != NULL) { |
| 1543 | // We only care about files. |
| 1544 | if (file->d_type != DT_REG) { |
| 1545 | continue; |
| 1546 | } |
| 1547 | |
| 1548 | // Skip anything that starts with a "." |
| 1549 | if (file->d_name[0] == '.') { |
| 1550 | continue; |
| 1551 | } |
| 1552 | |
| 1553 | // Find the current file's user. |
| 1554 | char* end; |
| 1555 | unsigned long thisUid = strtoul(file->d_name, &end, 10); |
| 1556 | if (end[0] != '_' || end[1] == 0) { |
| 1557 | continue; |
| 1558 | } |
| 1559 | UserState* otherUser = getUserState(thisUid); |
| 1560 | if (otherUser->getUserId() != 0) { |
| 1561 | unlinkat(dirfd(dir), file->d_name, 0); |
| 1562 | } |
| 1563 | |
| 1564 | // Rename the file into user directory. |
| 1565 | DIR* otherdir = opendir(otherUser->getUserDirName()); |
| 1566 | if (otherdir == NULL) { |
| 1567 | ALOGW("couldn't open user directory for rename"); |
| 1568 | continue; |
| 1569 | } |
| 1570 | if (renameat(dirfd(dir), file->d_name, dirfd(otherdir), file->d_name) < 0) { |
| 1571 | ALOGW("couldn't rename blob: %s: %s", file->d_name, strerror(errno)); |
| 1572 | } |
| 1573 | closedir(otherdir); |
| 1574 | } |
| 1575 | closedir(dir); |
| 1576 | |
| 1577 | mMetaData.version = 1; |
| 1578 | upgraded = true; |
| 1579 | } |
| 1580 | |
| 1581 | return upgraded; |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 1582 | } |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 1583 | }; |
| 1584 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1585 | const char* KeyStore::sOldMasterKey = ".masterkey"; |
| 1586 | const char* KeyStore::sMetaDataFile = ".metadata"; |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1587 | |
Kenny Root | 1b0e393 | 2013-09-05 13:06:32 -0700 | [diff] [blame] | 1588 | const android::String16 KeyStore::sRSAKeyType("RSA"); |
| 1589 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1590 | namespace android { |
| 1591 | class KeyStoreProxy : public BnKeystoreService, public IBinder::DeathRecipient { |
| 1592 | public: |
| 1593 | KeyStoreProxy(KeyStore* keyStore) |
| 1594 | : mKeyStore(keyStore) |
| 1595 | { |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 1596 | } |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 1597 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1598 | void binderDied(const wp<IBinder>&) { |
| 1599 | ALOGE("binder death detected"); |
Kenny Root | 822c3a9 | 2012-03-23 16:34:39 -0700 | [diff] [blame] | 1600 | } |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 1601 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1602 | int32_t test() { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 1603 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 1604 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
| 1605 | if (!has_permission(callingUid, P_TEST, spid)) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 1606 | ALOGW("permission denied for %d: test", callingUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1607 | return ::PERMISSION_DENIED; |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 1608 | } |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 1609 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1610 | return mKeyStore->getState(callingUid); |
Kenny Root | 298e7b1 | 2012-03-26 13:54:44 -0700 | [diff] [blame] | 1611 | } |
| 1612 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1613 | int32_t get(const String16& name, uint8_t** item, size_t* itemLength) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 1614 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 1615 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
| 1616 | if (!has_permission(callingUid, P_GET, spid)) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 1617 | ALOGW("permission denied for %d: get", callingUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1618 | return ::PERMISSION_DENIED; |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 1619 | } |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1620 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1621 | String8 name8(name); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1622 | Blob keyBlob; |
Nick Kralevich | 66dbf67 | 2014-06-30 17:09:14 +0000 | [diff] [blame] | 1623 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1624 | ResponseCode responseCode = mKeyStore->getKeyForName(&keyBlob, name8, callingUid, |
Kenny Root | 4946890 | 2013-03-19 13:41:33 -0700 | [diff] [blame] | 1625 | TYPE_GENERIC); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1626 | if (responseCode != ::NO_ERROR) { |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1627 | ALOGW("Could not read %s", name8.string()); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1628 | *item = NULL; |
| 1629 | *itemLength = 0; |
| 1630 | return responseCode; |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 1631 | } |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 1632 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1633 | *item = (uint8_t*) malloc(keyBlob.getLength()); |
| 1634 | memcpy(*item, keyBlob.getValue(), keyBlob.getLength()); |
| 1635 | *itemLength = keyBlob.getLength(); |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 1636 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1637 | return ::NO_ERROR; |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1638 | } |
| 1639 | |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 1640 | int32_t insert(const String16& name, const uint8_t* item, size_t itemLength, int targetUid, |
| 1641 | int32_t flags) { |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 1642 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 1643 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 1644 | if (!has_permission(callingUid, P_INSERT, spid)) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 1645 | ALOGW("permission denied for %d: insert", callingUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1646 | return ::PERMISSION_DENIED; |
| 1647 | } |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1648 | |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 1649 | State state = mKeyStore->getState(callingUid); |
| 1650 | if ((flags & KEYSTORE_FLAG_ENCRYPTED) && !isKeystoreUnlocked(state)) { |
| 1651 | ALOGD("calling get in state: %d", state); |
| 1652 | return state; |
| 1653 | } |
| 1654 | |
Kenny Root | 4946890 | 2013-03-19 13:41:33 -0700 | [diff] [blame] | 1655 | if (targetUid == -1) { |
| 1656 | targetUid = callingUid; |
| 1657 | } else if (!is_granted_to(callingUid, targetUid)) { |
Kenny Root | b88c3eb | 2013-02-13 14:43:43 -0800 | [diff] [blame] | 1658 | return ::PERMISSION_DENIED; |
| 1659 | } |
| 1660 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1661 | String8 name8(name); |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1662 | String8 filename(mKeyStore->getKeyNameForUidWithDir(name8, targetUid)); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1663 | |
| 1664 | Blob keyBlob(item, itemLength, NULL, 0, ::TYPE_GENERIC); |
Kenny Root | ee8068b | 2013-10-07 09:49:15 -0700 | [diff] [blame] | 1665 | keyBlob.setEncrypted(flags & KEYSTORE_FLAG_ENCRYPTED); |
| 1666 | |
Kenny Root | fa27d5b | 2013-10-15 09:01:08 -0700 | [diff] [blame] | 1667 | return mKeyStore->put(filename.string(), &keyBlob, targetUid); |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1668 | } |
| 1669 | |
Kenny Root | 4946890 | 2013-03-19 13:41:33 -0700 | [diff] [blame] | 1670 | int32_t del(const String16& name, int targetUid) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 1671 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 1672 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
| 1673 | if (!has_permission(callingUid, P_DELETE, spid)) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 1674 | ALOGW("permission denied for %d: del", callingUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1675 | return ::PERMISSION_DENIED; |
| 1676 | } |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1677 | |
Kenny Root | 4946890 | 2013-03-19 13:41:33 -0700 | [diff] [blame] | 1678 | if (targetUid == -1) { |
| 1679 | targetUid = callingUid; |
| 1680 | } else if (!is_granted_to(callingUid, targetUid)) { |
Kenny Root | b88c3eb | 2013-02-13 14:43:43 -0800 | [diff] [blame] | 1681 | return ::PERMISSION_DENIED; |
| 1682 | } |
| 1683 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1684 | String8 name8(name); |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1685 | String8 filename(mKeyStore->getKeyNameForUidWithDir(name8, targetUid)); |
Robin Lee | 4b84fdc | 2014-09-24 11:56:57 +0100 | [diff] [blame] | 1686 | return mKeyStore->del(filename.string(), ::TYPE_GENERIC, targetUid); |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1687 | } |
| 1688 | |
Kenny Root | 4946890 | 2013-03-19 13:41:33 -0700 | [diff] [blame] | 1689 | int32_t exist(const String16& name, int targetUid) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 1690 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 1691 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
| 1692 | if (!has_permission(callingUid, P_EXIST, spid)) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 1693 | ALOGW("permission denied for %d: exist", callingUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1694 | return ::PERMISSION_DENIED; |
| 1695 | } |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1696 | |
Kenny Root | 4946890 | 2013-03-19 13:41:33 -0700 | [diff] [blame] | 1697 | if (targetUid == -1) { |
| 1698 | targetUid = callingUid; |
| 1699 | } else if (!is_granted_to(callingUid, targetUid)) { |
Kenny Root | b88c3eb | 2013-02-13 14:43:43 -0800 | [diff] [blame] | 1700 | return ::PERMISSION_DENIED; |
| 1701 | } |
| 1702 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1703 | String8 name8(name); |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1704 | String8 filename(mKeyStore->getKeyNameForUidWithDir(name8, targetUid)); |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1705 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1706 | if (access(filename.string(), R_OK) == -1) { |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1707 | return (errno != ENOENT) ? ::SYSTEM_ERROR : ::KEY_NOT_FOUND; |
| 1708 | } |
| 1709 | return ::NO_ERROR; |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1710 | } |
| 1711 | |
Kenny Root | 4946890 | 2013-03-19 13:41:33 -0700 | [diff] [blame] | 1712 | int32_t saw(const String16& prefix, int targetUid, Vector<String16>* matches) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 1713 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 1714 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
| 1715 | if (!has_permission(callingUid, P_SAW, spid)) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 1716 | ALOGW("permission denied for %d: saw", callingUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1717 | return ::PERMISSION_DENIED; |
| 1718 | } |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1719 | |
Kenny Root | 4946890 | 2013-03-19 13:41:33 -0700 | [diff] [blame] | 1720 | if (targetUid == -1) { |
| 1721 | targetUid = callingUid; |
| 1722 | } else if (!is_granted_to(callingUid, targetUid)) { |
Kenny Root | b88c3eb | 2013-02-13 14:43:43 -0800 | [diff] [blame] | 1723 | return ::PERMISSION_DENIED; |
| 1724 | } |
| 1725 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1726 | const String8 prefix8(prefix); |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1727 | String8 filename(mKeyStore->getKeyNameForUid(prefix8, targetUid)); |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1728 | |
Robin Lee | 4b84fdc | 2014-09-24 11:56:57 +0100 | [diff] [blame] | 1729 | if (mKeyStore->saw(filename, matches, targetUid) != ::NO_ERROR) { |
| 1730 | return ::SYSTEM_ERROR; |
Kenny Root | 9a53d3e | 2012-08-14 10:47:54 -0700 | [diff] [blame] | 1731 | } |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1732 | return ::NO_ERROR; |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1733 | } |
| 1734 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1735 | int32_t reset() { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 1736 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 1737 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
| 1738 | if (!has_permission(callingUid, P_RESET, spid)) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 1739 | ALOGW("permission denied for %d: reset", callingUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1740 | return ::PERMISSION_DENIED; |
| 1741 | } |
| 1742 | |
Robin Lee | 4b84fdc | 2014-09-24 11:56:57 +0100 | [diff] [blame] | 1743 | return mKeyStore->reset(callingUid) ? ::NO_ERROR : ::SYSTEM_ERROR; |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1744 | } |
| 1745 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1746 | /* |
| 1747 | * Here is the history. To improve the security, the parameters to generate the |
| 1748 | * master key has been changed. To make a seamless transition, we update the |
| 1749 | * file using the same password when the user unlock it for the first time. If |
| 1750 | * any thing goes wrong during the transition, the new file will not overwrite |
| 1751 | * the old one. This avoids permanent damages of the existing data. |
| 1752 | */ |
| 1753 | int32_t password(const String16& password) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 1754 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 1755 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
| 1756 | if (!has_permission(callingUid, P_PASSWORD, spid)) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 1757 | ALOGW("permission denied for %d: password", callingUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1758 | return ::PERMISSION_DENIED; |
| 1759 | } |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1760 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1761 | const String8 password8(password); |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1762 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1763 | switch (mKeyStore->getState(callingUid)) { |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1764 | case ::STATE_UNINITIALIZED: { |
| 1765 | // generate master key, encrypt with password, write to file, initialize mMasterKey*. |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1766 | return mKeyStore->initializeUser(password8, callingUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1767 | } |
| 1768 | case ::STATE_NO_ERROR: { |
| 1769 | // rewrite master key with new password. |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1770 | return mKeyStore->writeMasterKey(password8, callingUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1771 | } |
| 1772 | case ::STATE_LOCKED: { |
| 1773 | // read master key, decrypt with password, initialize mMasterKey*. |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1774 | return mKeyStore->readMasterKey(password8, callingUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1775 | } |
| 1776 | } |
| 1777 | return ::SYSTEM_ERROR; |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1778 | } |
| 1779 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1780 | int32_t lock() { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 1781 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 1782 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
| 1783 | if (!has_permission(callingUid, P_LOCK, spid)) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 1784 | ALOGW("permission denied for %d: lock", callingUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1785 | return ::PERMISSION_DENIED; |
| 1786 | } |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1787 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1788 | State state = mKeyStore->getState(callingUid); |
Kenny Root | 9d45d1c | 2013-02-14 10:32:30 -0800 | [diff] [blame] | 1789 | if (state != ::STATE_NO_ERROR) { |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1790 | ALOGD("calling lock in state: %d", state); |
| 1791 | return state; |
| 1792 | } |
| 1793 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1794 | mKeyStore->lock(callingUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1795 | return ::NO_ERROR; |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1796 | } |
| 1797 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1798 | int32_t unlock(const String16& pw) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 1799 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 1800 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
| 1801 | if (!has_permission(callingUid, P_UNLOCK, spid)) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 1802 | ALOGW("permission denied for %d: unlock", callingUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1803 | return ::PERMISSION_DENIED; |
| 1804 | } |
| 1805 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1806 | State state = mKeyStore->getState(callingUid); |
Kenny Root | 9d45d1c | 2013-02-14 10:32:30 -0800 | [diff] [blame] | 1807 | if (state != ::STATE_LOCKED) { |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1808 | ALOGD("calling unlock when not locked"); |
| 1809 | return state; |
| 1810 | } |
| 1811 | |
| 1812 | const String8 password8(pw); |
| 1813 | return password(pw); |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1814 | } |
| 1815 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1816 | int32_t zero() { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 1817 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 1818 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
| 1819 | if (!has_permission(callingUid, P_ZERO, spid)) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 1820 | ALOGW("permission denied for %d: zero", callingUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1821 | return -1; |
| 1822 | } |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1823 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1824 | return mKeyStore->isEmpty(callingUid) ? ::KEY_NOT_FOUND : ::NO_ERROR; |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1825 | } |
| 1826 | |
Kenny Root | 96427ba | 2013-08-16 14:02:41 -0700 | [diff] [blame] | 1827 | int32_t generate(const String16& name, int32_t targetUid, int32_t keyType, int32_t keySize, |
| 1828 | int32_t flags, Vector<sp<KeystoreArg> >* args) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 1829 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 1830 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
| 1831 | if (!has_permission(callingUid, P_INSERT, spid)) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 1832 | ALOGW("permission denied for %d: generate", callingUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1833 | return ::PERMISSION_DENIED; |
| 1834 | } |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1835 | |
Kenny Root | 4946890 | 2013-03-19 13:41:33 -0700 | [diff] [blame] | 1836 | if (targetUid == -1) { |
| 1837 | targetUid = callingUid; |
| 1838 | } else if (!is_granted_to(callingUid, targetUid)) { |
Kenny Root | b88c3eb | 2013-02-13 14:43:43 -0800 | [diff] [blame] | 1839 | return ::PERMISSION_DENIED; |
| 1840 | } |
| 1841 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1842 | State state = mKeyStore->getState(callingUid); |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 1843 | if ((flags & KEYSTORE_FLAG_ENCRYPTED) && !isKeystoreUnlocked(state)) { |
| 1844 | ALOGW("calling generate in state: %d", state); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1845 | return state; |
| 1846 | } |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1847 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1848 | uint8_t* data; |
| 1849 | size_t dataLength; |
| 1850 | int rc; |
Kenny Root | 17208e0 | 2013-09-04 13:56:03 -0700 | [diff] [blame] | 1851 | bool isFallback = false; |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1852 | |
| 1853 | const keymaster_device_t* device = mKeyStore->getDevice(); |
| 1854 | if (device == NULL) { |
| 1855 | return ::SYSTEM_ERROR; |
| 1856 | } |
| 1857 | |
| 1858 | if (device->generate_keypair == NULL) { |
| 1859 | return ::SYSTEM_ERROR; |
| 1860 | } |
| 1861 | |
Kenny Root | 17208e0 | 2013-09-04 13:56:03 -0700 | [diff] [blame] | 1862 | if (keyType == EVP_PKEY_DSA) { |
Kenny Root | 96427ba | 2013-08-16 14:02:41 -0700 | [diff] [blame] | 1863 | keymaster_dsa_keygen_params_t dsa_params; |
| 1864 | memset(&dsa_params, '\0', sizeof(dsa_params)); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1865 | |
Kenny Root | 96427ba | 2013-08-16 14:02:41 -0700 | [diff] [blame] | 1866 | if (keySize == -1) { |
| 1867 | keySize = DSA_DEFAULT_KEY_SIZE; |
| 1868 | } else if ((keySize % 64) != 0 || keySize < DSA_MIN_KEY_SIZE |
| 1869 | || keySize > DSA_MAX_KEY_SIZE) { |
| 1870 | ALOGI("invalid key size %d", keySize); |
| 1871 | return ::SYSTEM_ERROR; |
| 1872 | } |
| 1873 | dsa_params.key_size = keySize; |
| 1874 | |
| 1875 | if (args->size() == 3) { |
| 1876 | sp<KeystoreArg> gArg = args->itemAt(0); |
| 1877 | sp<KeystoreArg> pArg = args->itemAt(1); |
| 1878 | sp<KeystoreArg> qArg = args->itemAt(2); |
| 1879 | |
| 1880 | if (gArg != NULL && pArg != NULL && qArg != NULL) { |
| 1881 | dsa_params.generator = reinterpret_cast<const uint8_t*>(gArg->data()); |
| 1882 | dsa_params.generator_len = gArg->size(); |
| 1883 | |
| 1884 | dsa_params.prime_p = reinterpret_cast<const uint8_t*>(pArg->data()); |
| 1885 | dsa_params.prime_p_len = pArg->size(); |
| 1886 | |
| 1887 | dsa_params.prime_q = reinterpret_cast<const uint8_t*>(qArg->data()); |
| 1888 | dsa_params.prime_q_len = qArg->size(); |
| 1889 | } else { |
| 1890 | ALOGI("not all DSA parameters were read"); |
| 1891 | return ::SYSTEM_ERROR; |
| 1892 | } |
| 1893 | } else if (args->size() != 0) { |
| 1894 | ALOGI("DSA args must be 3"); |
| 1895 | return ::SYSTEM_ERROR; |
| 1896 | } |
| 1897 | |
Kenny Root | 1d448c0 | 2013-11-21 10:36:53 -0800 | [diff] [blame] | 1898 | if (isKeyTypeSupported(device, TYPE_DSA)) { |
Kenny Root | 17208e0 | 2013-09-04 13:56:03 -0700 | [diff] [blame] | 1899 | rc = device->generate_keypair(device, TYPE_DSA, &dsa_params, &data, &dataLength); |
| 1900 | } else { |
| 1901 | isFallback = true; |
| 1902 | rc = openssl_generate_keypair(device, TYPE_DSA, &dsa_params, &data, &dataLength); |
| 1903 | } |
| 1904 | } else if (keyType == EVP_PKEY_EC) { |
Kenny Root | 96427ba | 2013-08-16 14:02:41 -0700 | [diff] [blame] | 1905 | keymaster_ec_keygen_params_t ec_params; |
| 1906 | memset(&ec_params, '\0', sizeof(ec_params)); |
| 1907 | |
| 1908 | if (keySize == -1) { |
| 1909 | keySize = EC_DEFAULT_KEY_SIZE; |
| 1910 | } else if (keySize < EC_MIN_KEY_SIZE || keySize > EC_MAX_KEY_SIZE) { |
| 1911 | ALOGI("invalid key size %d", keySize); |
| 1912 | return ::SYSTEM_ERROR; |
| 1913 | } |
| 1914 | ec_params.field_size = keySize; |
| 1915 | |
Kenny Root | 1d448c0 | 2013-11-21 10:36:53 -0800 | [diff] [blame] | 1916 | if (isKeyTypeSupported(device, TYPE_EC)) { |
Kenny Root | 17208e0 | 2013-09-04 13:56:03 -0700 | [diff] [blame] | 1917 | rc = device->generate_keypair(device, TYPE_EC, &ec_params, &data, &dataLength); |
| 1918 | } else { |
| 1919 | isFallback = true; |
| 1920 | rc = openssl_generate_keypair(device, TYPE_EC, &ec_params, &data, &dataLength); |
| 1921 | } |
Kenny Root | 96427ba | 2013-08-16 14:02:41 -0700 | [diff] [blame] | 1922 | } else if (keyType == EVP_PKEY_RSA) { |
| 1923 | keymaster_rsa_keygen_params_t rsa_params; |
| 1924 | memset(&rsa_params, '\0', sizeof(rsa_params)); |
| 1925 | rsa_params.public_exponent = RSA_DEFAULT_EXPONENT; |
| 1926 | |
| 1927 | if (keySize == -1) { |
| 1928 | keySize = RSA_DEFAULT_KEY_SIZE; |
| 1929 | } else if (keySize < RSA_MIN_KEY_SIZE || keySize > RSA_MAX_KEY_SIZE) { |
| 1930 | ALOGI("invalid key size %d", keySize); |
| 1931 | return ::SYSTEM_ERROR; |
| 1932 | } |
| 1933 | rsa_params.modulus_size = keySize; |
| 1934 | |
| 1935 | if (args->size() > 1) { |
Matteo Franchin | 6489e02 | 2013-12-02 14:46:29 +0000 | [diff] [blame] | 1936 | ALOGI("invalid number of arguments: %zu", args->size()); |
Kenny Root | 96427ba | 2013-08-16 14:02:41 -0700 | [diff] [blame] | 1937 | return ::SYSTEM_ERROR; |
| 1938 | } else if (args->size() == 1) { |
| 1939 | sp<KeystoreArg> pubExpBlob = args->itemAt(0); |
| 1940 | if (pubExpBlob != NULL) { |
| 1941 | Unique_BIGNUM pubExpBn( |
| 1942 | BN_bin2bn(reinterpret_cast<const unsigned char*>(pubExpBlob->data()), |
| 1943 | pubExpBlob->size(), NULL)); |
| 1944 | if (pubExpBn.get() == NULL) { |
| 1945 | ALOGI("Could not convert public exponent to BN"); |
| 1946 | return ::SYSTEM_ERROR; |
| 1947 | } |
| 1948 | unsigned long pubExp = BN_get_word(pubExpBn.get()); |
| 1949 | if (pubExp == 0xFFFFFFFFL) { |
| 1950 | ALOGI("cannot represent public exponent as a long value"); |
| 1951 | return ::SYSTEM_ERROR; |
| 1952 | } |
| 1953 | rsa_params.public_exponent = pubExp; |
| 1954 | } |
| 1955 | } |
| 1956 | |
| 1957 | rc = device->generate_keypair(device, TYPE_RSA, &rsa_params, &data, &dataLength); |
| 1958 | } else { |
| 1959 | ALOGW("Unsupported key type %d", keyType); |
| 1960 | rc = -1; |
| 1961 | } |
| 1962 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1963 | if (rc) { |
| 1964 | return ::SYSTEM_ERROR; |
| 1965 | } |
| 1966 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1967 | String8 name8(name); |
| 1968 | String8 filename(mKeyStore->getKeyNameForUidWithDir(name8, callingUid)); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1969 | |
| 1970 | Blob keyBlob(data, dataLength, NULL, 0, TYPE_KEY_PAIR); |
| 1971 | free(data); |
| 1972 | |
Kenny Root | ee8068b | 2013-10-07 09:49:15 -0700 | [diff] [blame] | 1973 | keyBlob.setEncrypted(flags & KEYSTORE_FLAG_ENCRYPTED); |
Kenny Root | 17208e0 | 2013-09-04 13:56:03 -0700 | [diff] [blame] | 1974 | keyBlob.setFallback(isFallback); |
| 1975 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 1976 | return mKeyStore->put(filename.string(), &keyBlob, callingUid); |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 1977 | } |
| 1978 | |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 1979 | int32_t import(const String16& name, const uint8_t* data, size_t length, int targetUid, |
| 1980 | int32_t flags) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 1981 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 1982 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
| 1983 | if (!has_permission(callingUid, P_INSERT, spid)) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 1984 | ALOGW("permission denied for %d: import", callingUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1985 | return ::PERMISSION_DENIED; |
| 1986 | } |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1987 | |
Kenny Root | 4946890 | 2013-03-19 13:41:33 -0700 | [diff] [blame] | 1988 | if (targetUid == -1) { |
| 1989 | targetUid = callingUid; |
| 1990 | } else if (!is_granted_to(callingUid, targetUid)) { |
Kenny Root | b88c3eb | 2013-02-13 14:43:43 -0800 | [diff] [blame] | 1991 | return ::PERMISSION_DENIED; |
| 1992 | } |
| 1993 | |
Kenny Root | fa27d5b | 2013-10-15 09:01:08 -0700 | [diff] [blame] | 1994 | State state = mKeyStore->getState(targetUid); |
Kenny Root | f9119d6 | 2013-04-03 09:22:15 -0700 | [diff] [blame] | 1995 | if ((flags & KEYSTORE_FLAG_ENCRYPTED) && !isKeystoreUnlocked(state)) { |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 1996 | ALOGD("calling import in state: %d", state); |
| 1997 | return state; |
| 1998 | } |
| 1999 | |
| 2000 | String8 name8(name); |
Kenny Root | 6089889 | 2013-04-16 18:08:03 -0700 | [diff] [blame] | 2001 | String8 filename(mKeyStore->getKeyNameForUidWithDir(name8, targetUid)); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2002 | |
Kenny Root | fa27d5b | 2013-10-15 09:01:08 -0700 | [diff] [blame] | 2003 | return mKeyStore->importKey(data, length, filename.string(), targetUid, flags); |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 2004 | } |
| 2005 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2006 | int32_t sign(const String16& name, const uint8_t* data, size_t length, uint8_t** out, |
| 2007 | size_t* outLength) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 2008 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 2009 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
| 2010 | if (!has_permission(callingUid, P_SIGN, spid)) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 2011 | ALOGW("permission denied for %d: saw", callingUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2012 | return ::PERMISSION_DENIED; |
| 2013 | } |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2014 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2015 | Blob keyBlob; |
| 2016 | String8 name8(name); |
| 2017 | |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 2018 | ALOGV("sign %s from uid %d", name8.string(), callingUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2019 | int rc; |
| 2020 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 2021 | ResponseCode responseCode = mKeyStore->getKeyForName(&keyBlob, name8, callingUid, |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 2022 | ::TYPE_KEY_PAIR); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2023 | if (responseCode != ::NO_ERROR) { |
| 2024 | return responseCode; |
| 2025 | } |
| 2026 | |
| 2027 | const keymaster_device_t* device = mKeyStore->getDevice(); |
| 2028 | if (device == NULL) { |
| 2029 | ALOGE("no keymaster device; cannot sign"); |
| 2030 | return ::SYSTEM_ERROR; |
| 2031 | } |
| 2032 | |
| 2033 | if (device->sign_data == NULL) { |
| 2034 | ALOGE("device doesn't implement signing"); |
| 2035 | return ::SYSTEM_ERROR; |
| 2036 | } |
| 2037 | |
| 2038 | keymaster_rsa_sign_params_t params; |
| 2039 | params.digest_type = DIGEST_NONE; |
| 2040 | params.padding_type = PADDING_NONE; |
| 2041 | |
Kenny Root | 17208e0 | 2013-09-04 13:56:03 -0700 | [diff] [blame] | 2042 | if (keyBlob.isFallback()) { |
| 2043 | rc = openssl_sign_data(device, ¶ms, keyBlob.getValue(), keyBlob.getLength(), data, |
| 2044 | length, out, outLength); |
| 2045 | } else { |
| 2046 | rc = device->sign_data(device, ¶ms, keyBlob.getValue(), keyBlob.getLength(), data, |
| 2047 | length, out, outLength); |
| 2048 | } |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2049 | if (rc) { |
| 2050 | ALOGW("device couldn't sign data"); |
| 2051 | return ::SYSTEM_ERROR; |
| 2052 | } |
| 2053 | |
| 2054 | return ::NO_ERROR; |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 2055 | } |
| 2056 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2057 | int32_t verify(const String16& name, const uint8_t* data, size_t dataLength, |
| 2058 | const uint8_t* signature, size_t signatureLength) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 2059 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 2060 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
| 2061 | if (!has_permission(callingUid, P_VERIFY, spid)) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 2062 | ALOGW("permission denied for %d: verify", callingUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2063 | return ::PERMISSION_DENIED; |
| 2064 | } |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 2065 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 2066 | State state = mKeyStore->getState(callingUid); |
Kenny Root | 9d45d1c | 2013-02-14 10:32:30 -0800 | [diff] [blame] | 2067 | if (!isKeystoreUnlocked(state)) { |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2068 | ALOGD("calling verify in state: %d", state); |
| 2069 | return state; |
| 2070 | } |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 2071 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2072 | Blob keyBlob; |
| 2073 | String8 name8(name); |
| 2074 | int rc; |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 2075 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 2076 | ResponseCode responseCode = mKeyStore->getKeyForName(&keyBlob, name8, callingUid, |
Kenny Root | 4946890 | 2013-03-19 13:41:33 -0700 | [diff] [blame] | 2077 | TYPE_KEY_PAIR); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2078 | if (responseCode != ::NO_ERROR) { |
| 2079 | return responseCode; |
| 2080 | } |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 2081 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2082 | const keymaster_device_t* device = mKeyStore->getDevice(); |
| 2083 | if (device == NULL) { |
| 2084 | return ::SYSTEM_ERROR; |
| 2085 | } |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 2086 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2087 | if (device->verify_data == NULL) { |
| 2088 | return ::SYSTEM_ERROR; |
| 2089 | } |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 2090 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2091 | keymaster_rsa_sign_params_t params; |
| 2092 | params.digest_type = DIGEST_NONE; |
| 2093 | params.padding_type = PADDING_NONE; |
Kenny Root | 344e0bc | 2012-08-15 10:44:03 -0700 | [diff] [blame] | 2094 | |
Kenny Root | 17208e0 | 2013-09-04 13:56:03 -0700 | [diff] [blame] | 2095 | if (keyBlob.isFallback()) { |
| 2096 | rc = openssl_verify_data(device, ¶ms, keyBlob.getValue(), keyBlob.getLength(), data, |
| 2097 | dataLength, signature, signatureLength); |
| 2098 | } else { |
| 2099 | rc = device->verify_data(device, ¶ms, keyBlob.getValue(), keyBlob.getLength(), data, |
| 2100 | dataLength, signature, signatureLength); |
| 2101 | } |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2102 | if (rc) { |
| 2103 | return ::SYSTEM_ERROR; |
| 2104 | } else { |
| 2105 | return ::NO_ERROR; |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 2106 | } |
| 2107 | } |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2108 | |
| 2109 | /* |
| 2110 | * TODO: The abstraction between things stored in hardware and regular blobs |
| 2111 | * of data stored on the filesystem should be moved down to keystore itself. |
| 2112 | * Unfortunately the Java code that calls this has naming conventions that it |
| 2113 | * knows about. Ideally keystore shouldn't be used to store random blobs of |
| 2114 | * data. |
| 2115 | * |
| 2116 | * Until that happens, it's necessary to have a separate "get_pubkey" and |
| 2117 | * "del_key" since the Java code doesn't really communicate what it's |
| 2118 | * intentions are. |
| 2119 | */ |
| 2120 | int32_t get_pubkey(const String16& name, uint8_t** pubkey, size_t* pubkeyLength) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 2121 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 2122 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
| 2123 | if (!has_permission(callingUid, P_GET, spid)) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 2124 | ALOGW("permission denied for %d: get_pubkey", callingUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2125 | return ::PERMISSION_DENIED; |
| 2126 | } |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2127 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2128 | Blob keyBlob; |
| 2129 | String8 name8(name); |
| 2130 | |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 2131 | ALOGV("get_pubkey '%s' from uid %d", name8.string(), callingUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2132 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 2133 | ResponseCode responseCode = mKeyStore->getKeyForName(&keyBlob, name8, callingUid, |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2134 | TYPE_KEY_PAIR); |
| 2135 | if (responseCode != ::NO_ERROR) { |
| 2136 | return responseCode; |
| 2137 | } |
| 2138 | |
| 2139 | const keymaster_device_t* device = mKeyStore->getDevice(); |
| 2140 | if (device == NULL) { |
| 2141 | return ::SYSTEM_ERROR; |
| 2142 | } |
| 2143 | |
| 2144 | if (device->get_keypair_public == NULL) { |
| 2145 | ALOGE("device has no get_keypair_public implementation!"); |
| 2146 | return ::SYSTEM_ERROR; |
| 2147 | } |
| 2148 | |
Kenny Root | 17208e0 | 2013-09-04 13:56:03 -0700 | [diff] [blame] | 2149 | int rc; |
| 2150 | if (keyBlob.isFallback()) { |
| 2151 | rc = openssl_get_keypair_public(device, keyBlob.getValue(), keyBlob.getLength(), pubkey, |
| 2152 | pubkeyLength); |
| 2153 | } else { |
| 2154 | rc = device->get_keypair_public(device, keyBlob.getValue(), keyBlob.getLength(), pubkey, |
| 2155 | pubkeyLength); |
| 2156 | } |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2157 | if (rc) { |
| 2158 | return ::SYSTEM_ERROR; |
| 2159 | } |
| 2160 | |
| 2161 | return ::NO_ERROR; |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 2162 | } |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2163 | |
Kenny Root | 4946890 | 2013-03-19 13:41:33 -0700 | [diff] [blame] | 2164 | int32_t del_key(const String16& name, int targetUid) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 2165 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 2166 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
| 2167 | if (!has_permission(callingUid, P_DELETE, spid)) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 2168 | ALOGW("permission denied for %d: del_key", callingUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2169 | return ::PERMISSION_DENIED; |
| 2170 | } |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2171 | |
Kenny Root | 4946890 | 2013-03-19 13:41:33 -0700 | [diff] [blame] | 2172 | if (targetUid == -1) { |
| 2173 | targetUid = callingUid; |
| 2174 | } else if (!is_granted_to(callingUid, targetUid)) { |
Kenny Root | b88c3eb | 2013-02-13 14:43:43 -0800 | [diff] [blame] | 2175 | return ::PERMISSION_DENIED; |
| 2176 | } |
| 2177 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2178 | String8 name8(name); |
Kenny Root | fa27d5b | 2013-10-15 09:01:08 -0700 | [diff] [blame] | 2179 | String8 filename(mKeyStore->getKeyNameForUidWithDir(name8, targetUid)); |
Robin Lee | 4b84fdc | 2014-09-24 11:56:57 +0100 | [diff] [blame] | 2180 | return mKeyStore->del(filename.string(), ::TYPE_KEY_PAIR, targetUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2181 | } |
| 2182 | |
| 2183 | int32_t grant(const String16& name, int32_t granteeUid) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 2184 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 2185 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
| 2186 | if (!has_permission(callingUid, P_GRANT, spid)) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 2187 | ALOGW("permission denied for %d: grant", callingUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2188 | return ::PERMISSION_DENIED; |
| 2189 | } |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2190 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 2191 | State state = mKeyStore->getState(callingUid); |
Kenny Root | 9d45d1c | 2013-02-14 10:32:30 -0800 | [diff] [blame] | 2192 | if (!isKeystoreUnlocked(state)) { |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2193 | ALOGD("calling grant in state: %d", state); |
| 2194 | return state; |
| 2195 | } |
| 2196 | |
| 2197 | String8 name8(name); |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 2198 | String8 filename(mKeyStore->getKeyNameForUidWithDir(name8, callingUid)); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2199 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 2200 | if (access(filename.string(), R_OK) == -1) { |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2201 | return (errno != ENOENT) ? ::SYSTEM_ERROR : ::KEY_NOT_FOUND; |
| 2202 | } |
| 2203 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 2204 | mKeyStore->addGrant(filename.string(), granteeUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2205 | return ::NO_ERROR; |
| 2206 | } |
| 2207 | |
| 2208 | int32_t ungrant(const String16& name, int32_t granteeUid) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 2209 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 2210 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
| 2211 | if (!has_permission(callingUid, P_GRANT, spid)) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 2212 | ALOGW("permission denied for %d: ungrant", callingUid); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2213 | return ::PERMISSION_DENIED; |
| 2214 | } |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2215 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 2216 | State state = mKeyStore->getState(callingUid); |
Kenny Root | 9d45d1c | 2013-02-14 10:32:30 -0800 | [diff] [blame] | 2217 | if (!isKeystoreUnlocked(state)) { |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2218 | ALOGD("calling ungrant in state: %d", state); |
| 2219 | return state; |
| 2220 | } |
| 2221 | |
| 2222 | String8 name8(name); |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 2223 | String8 filename(mKeyStore->getKeyNameForUidWithDir(name8, callingUid)); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2224 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 2225 | if (access(filename.string(), R_OK) == -1) { |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2226 | return (errno != ENOENT) ? ::SYSTEM_ERROR : ::KEY_NOT_FOUND; |
| 2227 | } |
| 2228 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 2229 | return mKeyStore->removeGrant(filename.string(), granteeUid) ? ::NO_ERROR : ::KEY_NOT_FOUND; |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2230 | } |
| 2231 | |
| 2232 | int64_t getmtime(const String16& name) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 2233 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 2234 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
| 2235 | if (!has_permission(callingUid, P_GET, spid)) { |
Kenny Root | d38a0b0 | 2013-02-13 12:59:14 -0800 | [diff] [blame] | 2236 | ALOGW("permission denied for %d: getmtime", callingUid); |
Kenny Root | 36a9e23 | 2013-02-04 14:24:15 -0800 | [diff] [blame] | 2237 | return -1L; |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2238 | } |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2239 | |
| 2240 | String8 name8(name); |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 2241 | String8 filename(mKeyStore->getKeyNameForUidWithDir(name8, callingUid)); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2242 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 2243 | if (access(filename.string(), R_OK) == -1) { |
| 2244 | ALOGW("could not access %s for getmtime", filename.string()); |
Kenny Root | 36a9e23 | 2013-02-04 14:24:15 -0800 | [diff] [blame] | 2245 | return -1L; |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2246 | } |
| 2247 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 2248 | int fd = TEMP_FAILURE_RETRY(open(filename.string(), O_NOFOLLOW, O_RDONLY)); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2249 | if (fd < 0) { |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 2250 | ALOGW("could not open %s for getmtime", filename.string()); |
Kenny Root | 36a9e23 | 2013-02-04 14:24:15 -0800 | [diff] [blame] | 2251 | return -1L; |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2252 | } |
| 2253 | |
| 2254 | struct stat s; |
| 2255 | int ret = fstat(fd, &s); |
| 2256 | close(fd); |
| 2257 | if (ret == -1) { |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 2258 | ALOGW("could not stat %s for getmtime", filename.string()); |
Kenny Root | 36a9e23 | 2013-02-04 14:24:15 -0800 | [diff] [blame] | 2259 | return -1L; |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2260 | } |
| 2261 | |
Kenny Root | 36a9e23 | 2013-02-04 14:24:15 -0800 | [diff] [blame] | 2262 | return static_cast<int64_t>(s.st_mtime); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2263 | } |
| 2264 | |
Kenny Root | d53bc92 | 2013-03-21 14:10:15 -0700 | [diff] [blame] | 2265 | int32_t duplicate(const String16& srcKey, int32_t srcUid, const String16& destKey, |
| 2266 | int32_t destUid) { |
Kenny Root | 0225407 | 2013-03-20 11:48:19 -0700 | [diff] [blame] | 2267 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 2268 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
| 2269 | if (!has_permission(callingUid, P_DUPLICATE, spid)) { |
Kenny Root | d53bc92 | 2013-03-21 14:10:15 -0700 | [diff] [blame] | 2270 | ALOGW("permission denied for %d: duplicate", callingUid); |
Kenny Root | 0225407 | 2013-03-20 11:48:19 -0700 | [diff] [blame] | 2271 | return -1L; |
| 2272 | } |
| 2273 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 2274 | State state = mKeyStore->getState(callingUid); |
Kenny Root | 0225407 | 2013-03-20 11:48:19 -0700 | [diff] [blame] | 2275 | if (!isKeystoreUnlocked(state)) { |
Kenny Root | d53bc92 | 2013-03-21 14:10:15 -0700 | [diff] [blame] | 2276 | ALOGD("calling duplicate in state: %d", state); |
Kenny Root | 0225407 | 2013-03-20 11:48:19 -0700 | [diff] [blame] | 2277 | return state; |
| 2278 | } |
| 2279 | |
Kenny Root | d53bc92 | 2013-03-21 14:10:15 -0700 | [diff] [blame] | 2280 | if (srcUid == -1 || static_cast<uid_t>(srcUid) == callingUid) { |
| 2281 | srcUid = callingUid; |
| 2282 | } else if (!is_granted_to(callingUid, srcUid)) { |
| 2283 | ALOGD("migrate not granted from source: %d -> %d", callingUid, srcUid); |
Kenny Root | 0225407 | 2013-03-20 11:48:19 -0700 | [diff] [blame] | 2284 | return ::PERMISSION_DENIED; |
| 2285 | } |
| 2286 | |
Kenny Root | d53bc92 | 2013-03-21 14:10:15 -0700 | [diff] [blame] | 2287 | if (destUid == -1) { |
| 2288 | destUid = callingUid; |
| 2289 | } |
| 2290 | |
| 2291 | if (srcUid != destUid) { |
| 2292 | if (static_cast<uid_t>(srcUid) != callingUid) { |
| 2293 | ALOGD("can only duplicate from caller to other or to same uid: " |
| 2294 | "calling=%d, srcUid=%d, destUid=%d", callingUid, srcUid, destUid); |
| 2295 | return ::PERMISSION_DENIED; |
| 2296 | } |
| 2297 | |
| 2298 | if (!is_granted_to(callingUid, destUid)) { |
| 2299 | ALOGD("duplicate not granted to dest: %d -> %d", callingUid, destUid); |
| 2300 | return ::PERMISSION_DENIED; |
| 2301 | } |
| 2302 | } |
| 2303 | |
| 2304 | String8 source8(srcKey); |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 2305 | String8 sourceFile(mKeyStore->getKeyNameForUidWithDir(source8, srcUid)); |
Kenny Root | 0225407 | 2013-03-20 11:48:19 -0700 | [diff] [blame] | 2306 | |
Kenny Root | d53bc92 | 2013-03-21 14:10:15 -0700 | [diff] [blame] | 2307 | String8 target8(destKey); |
Kenny Root | fa27d5b | 2013-10-15 09:01:08 -0700 | [diff] [blame] | 2308 | String8 targetFile(mKeyStore->getKeyNameForUidWithDir(target8, destUid)); |
Kenny Root | 0225407 | 2013-03-20 11:48:19 -0700 | [diff] [blame] | 2309 | |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 2310 | if (access(targetFile.string(), W_OK) != -1 || errno != ENOENT) { |
| 2311 | ALOGD("destination already exists: %s", targetFile.string()); |
Kenny Root | 0225407 | 2013-03-20 11:48:19 -0700 | [diff] [blame] | 2312 | return ::SYSTEM_ERROR; |
| 2313 | } |
| 2314 | |
Kenny Root | d53bc92 | 2013-03-21 14:10:15 -0700 | [diff] [blame] | 2315 | Blob keyBlob; |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 2316 | ResponseCode responseCode = mKeyStore->get(sourceFile.string(), &keyBlob, TYPE_ANY, |
Kenny Root | fa27d5b | 2013-10-15 09:01:08 -0700 | [diff] [blame] | 2317 | srcUid); |
Kenny Root | d53bc92 | 2013-03-21 14:10:15 -0700 | [diff] [blame] | 2318 | if (responseCode != ::NO_ERROR) { |
| 2319 | return responseCode; |
Kenny Root | 0225407 | 2013-03-20 11:48:19 -0700 | [diff] [blame] | 2320 | } |
Kenny Root | d53bc92 | 2013-03-21 14:10:15 -0700 | [diff] [blame] | 2321 | |
Kenny Root | fa27d5b | 2013-10-15 09:01:08 -0700 | [diff] [blame] | 2322 | return mKeyStore->put(targetFile.string(), &keyBlob, destUid); |
Kenny Root | 0225407 | 2013-03-20 11:48:19 -0700 | [diff] [blame] | 2323 | } |
| 2324 | |
Kenny Root | 1b0e393 | 2013-09-05 13:06:32 -0700 | [diff] [blame] | 2325 | int32_t is_hardware_backed(const String16& keyType) { |
| 2326 | return mKeyStore->isHardwareBacked(keyType) ? 1 : 0; |
Kenny Root | 8ddf35a | 2013-03-29 11:15:50 -0700 | [diff] [blame] | 2327 | } |
| 2328 | |
Kenny Root | fa27d5b | 2013-10-15 09:01:08 -0700 | [diff] [blame] | 2329 | int32_t clear_uid(int64_t targetUid64) { |
| 2330 | uid_t targetUid = static_cast<uid_t>(targetUid64); |
Kenny Root | a9bb549 | 2013-04-01 16:29:11 -0700 | [diff] [blame] | 2331 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 2332 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
| 2333 | if (!has_permission(callingUid, P_CLEAR_UID, spid)) { |
Kenny Root | a9bb549 | 2013-04-01 16:29:11 -0700 | [diff] [blame] | 2334 | ALOGW("permission denied for %d: clear_uid", callingUid); |
| 2335 | return ::PERMISSION_DENIED; |
| 2336 | } |
| 2337 | |
Kenny Root | fa27d5b | 2013-10-15 09:01:08 -0700 | [diff] [blame] | 2338 | if (targetUid64 == -1) { |
| 2339 | targetUid = callingUid; |
Kenny Root | 007cb23 | 2014-07-30 16:59:42 -0700 | [diff] [blame] | 2340 | } else if (!is_self_or_system(callingUid, targetUid)) { |
| 2341 | ALOGW("permission denied for %d: clear_uid %d", callingUid, targetUid); |
Kenny Root | fa27d5b | 2013-10-15 09:01:08 -0700 | [diff] [blame] | 2342 | return ::PERMISSION_DENIED; |
| 2343 | } |
| 2344 | |
Kenny Root | a9bb549 | 2013-04-01 16:29:11 -0700 | [diff] [blame] | 2345 | const keymaster_device_t* device = mKeyStore->getDevice(); |
| 2346 | if (device == NULL) { |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 2347 | ALOGW("can't get keymaster device"); |
Kenny Root | a9bb549 | 2013-04-01 16:29:11 -0700 | [diff] [blame] | 2348 | return ::SYSTEM_ERROR; |
| 2349 | } |
| 2350 | |
Robin Lee | 4b84fdc | 2014-09-24 11:56:57 +0100 | [diff] [blame] | 2351 | String8 prefix = String8::format("%u_", targetUid); |
| 2352 | Vector<String16> aliases; |
| 2353 | if (mKeyStore->saw(prefix, &aliases, targetUid) != ::NO_ERROR) { |
Kenny Root | a9bb549 | 2013-04-01 16:29:11 -0700 | [diff] [blame] | 2354 | return ::SYSTEM_ERROR; |
| 2355 | } |
| 2356 | |
Robin Lee | 4b84fdc | 2014-09-24 11:56:57 +0100 | [diff] [blame] | 2357 | for (uint32_t i = 0; i < aliases.size(); i++) { |
| 2358 | String8 name8(aliases[i]); |
| 2359 | String8 filename(mKeyStore->getKeyNameForUidWithDir(name8, targetUid)); |
| 2360 | mKeyStore->del(filename.string(), ::TYPE_ANY, targetUid); |
Kenny Root | a9bb549 | 2013-04-01 16:29:11 -0700 | [diff] [blame] | 2361 | } |
Robin Lee | 4b84fdc | 2014-09-24 11:56:57 +0100 | [diff] [blame] | 2362 | return ::NO_ERROR; |
Kenny Root | a9bb549 | 2013-04-01 16:29:11 -0700 | [diff] [blame] | 2363 | } |
| 2364 | |
Robin Lee | 4b84fdc | 2014-09-24 11:56:57 +0100 | [diff] [blame] | 2365 | int32_t reset_uid(int32_t targetUid) { |
Robin Lee | 4e86575 | 2014-08-19 17:37:55 +0100 | [diff] [blame] | 2366 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
| 2367 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
Robin Lee | 4b84fdc | 2014-09-24 11:56:57 +0100 | [diff] [blame] | 2368 | |
Robin Lee | 4e86575 | 2014-08-19 17:37:55 +0100 | [diff] [blame] | 2369 | if (!has_permission(callingUid, P_RESET_UID, spid)) { |
Robin Lee | 4b84fdc | 2014-09-24 11:56:57 +0100 | [diff] [blame] | 2370 | ALOGW("permission denied for %d: reset_uid %d", callingUid, targetUid); |
Robin Lee | 4e86575 | 2014-08-19 17:37:55 +0100 | [diff] [blame] | 2371 | return ::PERMISSION_DENIED; |
| 2372 | } |
Robin Lee | 4b84fdc | 2014-09-24 11:56:57 +0100 | [diff] [blame] | 2373 | if (!is_self_or_system(callingUid, targetUid)) { |
| 2374 | ALOGW("permission denied for %d: reset_uid %d", callingUid, targetUid); |
Robin Lee | 4e86575 | 2014-08-19 17:37:55 +0100 | [diff] [blame] | 2375 | return ::PERMISSION_DENIED; |
| 2376 | } |
| 2377 | |
Robin Lee | 4b84fdc | 2014-09-24 11:56:57 +0100 | [diff] [blame] | 2378 | return mKeyStore->reset(targetUid) ? ::NO_ERROR : ::SYSTEM_ERROR; |
Robin Lee | 4e86575 | 2014-08-19 17:37:55 +0100 | [diff] [blame] | 2379 | } |
| 2380 | |
| 2381 | int32_t sync_uid(int32_t sourceUid, int32_t targetUid) { |
| 2382 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
| 2383 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
| 2384 | if (!has_permission(callingUid, P_SYNC_UID, spid)) { |
| 2385 | ALOGW("permission denied for %d: sync_uid %d -> %d", callingUid, sourceUid, targetUid); |
| 2386 | return ::PERMISSION_DENIED; |
| 2387 | } |
| 2388 | if (callingUid != AID_SYSTEM) { |
| 2389 | ALOGW("permission denied for %d: sync_uid %d -> %d", callingUid, sourceUid, targetUid); |
| 2390 | return ::PERMISSION_DENIED; |
| 2391 | } |
| 2392 | if (sourceUid == targetUid) { |
| 2393 | return ::SYSTEM_ERROR; |
| 2394 | } |
| 2395 | |
| 2396 | // Initialise user keystore with existing master key held in-memory |
| 2397 | return mKeyStore->copyMasterKey(sourceUid, targetUid); |
| 2398 | } |
| 2399 | |
| 2400 | int32_t password_uid(const String16& pw, int32_t targetUid) { |
| 2401 | uid_t callingUid = IPCThreadState::self()->getCallingUid(); |
| 2402 | pid_t spid = IPCThreadState::self()->getCallingPid(); |
| 2403 | if (!has_permission(callingUid, P_PASSWORD_UID, spid)) { |
| 2404 | ALOGW("permission denied for %d: password_uid %d", callingUid, targetUid); |
| 2405 | return ::PERMISSION_DENIED; |
| 2406 | } |
| 2407 | if (callingUid != AID_SYSTEM) { |
| 2408 | ALOGW("permission denied for %d: password_uid %d", callingUid, targetUid); |
| 2409 | return ::PERMISSION_DENIED; |
| 2410 | } |
| 2411 | |
| 2412 | const String8 password8(pw); |
| 2413 | |
| 2414 | switch (mKeyStore->getState(targetUid)) { |
| 2415 | case ::STATE_UNINITIALIZED: { |
| 2416 | // generate master key, encrypt with password, write to file, initialize mMasterKey*. |
| 2417 | return mKeyStore->initializeUser(password8, targetUid); |
| 2418 | } |
| 2419 | case ::STATE_NO_ERROR: { |
| 2420 | // rewrite master key with new password. |
| 2421 | return mKeyStore->writeMasterKey(password8, targetUid); |
| 2422 | } |
| 2423 | case ::STATE_LOCKED: { |
| 2424 | // read master key, decrypt with password, initialize mMasterKey*. |
| 2425 | return mKeyStore->readMasterKey(password8, targetUid); |
| 2426 | } |
| 2427 | } |
| 2428 | return ::SYSTEM_ERROR; |
| 2429 | } |
| 2430 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2431 | private: |
Kenny Root | 9d45d1c | 2013-02-14 10:32:30 -0800 | [diff] [blame] | 2432 | inline bool isKeystoreUnlocked(State state) { |
| 2433 | switch (state) { |
| 2434 | case ::STATE_NO_ERROR: |
| 2435 | return true; |
| 2436 | case ::STATE_UNINITIALIZED: |
| 2437 | case ::STATE_LOCKED: |
| 2438 | return false; |
| 2439 | } |
| 2440 | return false; |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2441 | } |
| 2442 | |
Kenny Root | 1d448c0 | 2013-11-21 10:36:53 -0800 | [diff] [blame] | 2443 | bool isKeyTypeSupported(const keymaster_device_t* device, keymaster_keypair_t keyType) { |
| 2444 | const int32_t device_api = device->common.module->module_api_version; |
| 2445 | if (device_api == KEYMASTER_MODULE_API_VERSION_0_2) { |
| 2446 | switch (keyType) { |
| 2447 | case TYPE_RSA: |
| 2448 | case TYPE_DSA: |
| 2449 | case TYPE_EC: |
| 2450 | return true; |
| 2451 | default: |
| 2452 | return false; |
| 2453 | } |
| 2454 | } else if (device_api >= KEYMASTER_MODULE_API_VERSION_0_3) { |
| 2455 | switch (keyType) { |
| 2456 | case TYPE_RSA: |
| 2457 | return true; |
| 2458 | case TYPE_DSA: |
| 2459 | return device->flags & KEYMASTER_SUPPORTS_DSA; |
| 2460 | case TYPE_EC: |
| 2461 | return device->flags & KEYMASTER_SUPPORTS_EC; |
| 2462 | default: |
| 2463 | return false; |
| 2464 | } |
| 2465 | } else { |
| 2466 | return keyType == TYPE_RSA; |
| 2467 | } |
| 2468 | } |
| 2469 | |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2470 | ::KeyStore* mKeyStore; |
| 2471 | }; |
| 2472 | |
| 2473 | }; // namespace android |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 2474 | |
| 2475 | int main(int argc, char* argv[]) { |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 2476 | if (argc < 2) { |
| 2477 | ALOGE("A directory must be specified!"); |
| 2478 | return 1; |
| 2479 | } |
| 2480 | if (chdir(argv[1]) == -1) { |
| 2481 | ALOGE("chdir: %s: %s", argv[1], strerror(errno)); |
| 2482 | return 1; |
| 2483 | } |
| 2484 | |
| 2485 | Entropy entropy; |
| 2486 | if (!entropy.open()) { |
| 2487 | return 1; |
| 2488 | } |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 2489 | |
| 2490 | keymaster_device_t* dev; |
| 2491 | if (keymaster_device_initialize(&dev)) { |
| 2492 | ALOGE("keystore keymaster could not be initialized; exiting"); |
| 2493 | return 1; |
| 2494 | } |
| 2495 | |
Riley Spahn | eaabae9 | 2014-06-30 12:39:52 -0700 | [diff] [blame] | 2496 | ks_is_selinux_enabled = is_selinux_enabled(); |
| 2497 | if (ks_is_selinux_enabled) { |
| 2498 | union selinux_callback cb; |
| 2499 | cb.func_log = selinux_log_callback; |
| 2500 | selinux_set_callback(SELINUX_CB_LOG, cb); |
| 2501 | if (getcon(&tctx) != 0) { |
| 2502 | ALOGE("SELinux: Could not acquire target context. Aborting keystore.\n"); |
| 2503 | return -1; |
| 2504 | } |
| 2505 | } else { |
| 2506 | ALOGI("SELinux: Keystore SELinux is disabled.\n"); |
| 2507 | } |
| 2508 | |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 2509 | KeyStore keyStore(&entropy, dev); |
Kenny Root | 655b958 | 2013-04-04 08:37:42 -0700 | [diff] [blame] | 2510 | keyStore.initialize(); |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2511 | android::sp<android::IServiceManager> sm = android::defaultServiceManager(); |
| 2512 | android::sp<android::KeyStoreProxy> proxy = new android::KeyStoreProxy(&keyStore); |
| 2513 | android::status_t ret = sm->addService(android::String16("android.security.keystore"), proxy); |
| 2514 | if (ret != android::OK) { |
| 2515 | ALOGE("Couldn't register binder service!"); |
| 2516 | return -1; |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 2517 | } |
Kenny Root | 07438c8 | 2012-11-02 15:41:02 -0700 | [diff] [blame] | 2518 | |
| 2519 | /* |
| 2520 | * We're the only thread in existence, so we're just going to process |
| 2521 | * Binder transaction as a single-threaded program. |
| 2522 | */ |
| 2523 | android::IPCThreadState::self()->joinThreadPool(); |
Kenny Root | 70e3a86 | 2012-02-15 17:20:23 -0800 | [diff] [blame] | 2524 | |
| 2525 | keymaster_device_release(dev); |
Kenny Root | a91203b | 2012-02-15 15:00:46 -0800 | [diff] [blame] | 2526 | return 1; |
| 2527 | } |