OSX/libsecurity_keychain/lib/TokenLogin.cpp

   1 /*
   2  * Copyright (c) 2016 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #include "TokenLogin.h"
  25
  26 #include <Security/SecItem.h>
  27 #include <Security/SecItemPriv.h>
  28 #include <Security/SecKeyPriv.h>
  29 #include "SecBase64P.h"
  30 #include <Security/SecIdentity.h>
  31 #include <Security/SecCertificatePriv.h>
  32 #include <Security/SecKeychainPriv.h>
  33 #include <security_utilities/cfutilities.h>
  34 #include <libaks.h>
  35 #include <libaks_smartcard.h>
  36
  37 extern "C" {
  38 #include <ctkclient.h>
  39 #include <coreauthd_spi.h>
  40 }
  41
  42 static os_log_t TOKEN_LOG_DEFAULT() {
  43     static dispatch_once_t once;
  44     static os_log_t log;
  45     dispatch_once(&once, ^{ log = os_log_create("com.apple.security", "tokenlogin"); });
  46     return log;
  47 };
  48 #define TL_LOG TOKEN_LOG_DEFAULT()
  49
  50 #define kSecTokenLoginDomain CFSTR("com.apple.security.tokenlogin")
  51
  52 static CFStringRef CF_RETURNS_RETAINED cfDataToHex(CFDataRef bin)
  53 {
  54     size_t len = CFDataGetLength(bin) * 2;
  55     CFMutableStringRef str = CFStringCreateMutable(NULL, len);
  56
  57     static const char* digits[] = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F"};
  58
  59     const uint8_t* data = CFDataGetBytePtr(bin);
  60     for (size_t i = 0; i < CFDataGetLength(bin); i++) {
  61         CFStringAppendCString(str, digits[data[i] >> 4], 1);
  62         CFStringAppendCString(str, digits[data[i] & 0xf], 1);
  63     }
  64     return str;
  65 }
  66
  67 static CFStringRef getPin(CFDictionaryRef context)
  68 {
  69         if (!context) {
  70                 return NULL;
  71         }
  72
  73         CFStringRef pin = (CFStringRef)CFDictionaryGetValue(context, kSecAttrService);
  74         if (!pin || CFGetTypeID(pin) != CFStringGetTypeID()) {
  75                 return NULL;
  76         }
  77         return pin;
  78 }
  79
  80 static CFStringRef getTokenId(CFDictionaryRef context)
  81 {
  82         if (!context) {
  83                 return NULL;
  84         }
  85
  86         CFStringRef tokenId = (CFStringRef)CFDictionaryGetValue(context, kSecAttrTokenID);
  87         if (!tokenId || CFGetTypeID(tokenId) != CFStringGetTypeID()) {
  88                 os_log_debug(TL_LOG, "Invalid tokenId");
  89                 return NULL;
  90         }
  91         return tokenId;
  92 }
  93
  94 static CFDataRef getPubKeyHash(CFDictionaryRef context)
  95 {
  96         if (!context) {
  97                 return NULL;
  98         }
  99
 100         CFDataRef pubKeyHash = (CFDataRef)CFDictionaryGetValue(context, kSecAttrPublicKeyHash);
 101         if (!pubKeyHash || CFGetTypeID(pubKeyHash) != CFDataGetTypeID()) {
 102                 os_log_debug(TL_LOG, "Invalid pubkeyhash");
 103                 return NULL;
 104         }
 105         return pubKeyHash;
 106 }
 107
 108 static CFDataRef getPubKeyHashWrap(CFDictionaryRef context)
 109 {
 110         if (!context) {
 111                 return NULL;
 112         }
 113
 114         CFDataRef pubKeyHashWrap = (CFDataRef)CFDictionaryGetValue(context, kSecAttrAccount);
 115         if (!pubKeyHashWrap || CFGetTypeID(pubKeyHashWrap) != CFDataGetTypeID()) {
 116                 os_log_debug(TL_LOG, "Invalid pubkeyhashwrap");
 117                 return NULL;
 118         }
 119         return pubKeyHashWrap;
 120 }
 121
 122 static OSStatus privKeyForPubKeyHash(CFDictionaryRef context, SecKeyRef *privKey, CFTypeRef *laCtx)
 123 {
 124     if (!context) {
 125         os_log_error(TL_LOG, "private key for pubkeyhash wrong params");
 126         return errSecParam;
 127     }
 128
 129     CFRef<CFMutableDictionaryRef> tokenAttributes = makeCFMutableDictionary(1, kSecAttrTokenID, getTokenId(context));
 130     CFRef<CFErrorRef> error;
 131
 132         CFStringRef pin = getPin(context);
 133         if (pin) {
 134                 CFRef<CFTypeRef> LAContext = LACreateNewContextWithACMContext(NULL, error.take());
 135                 if (!LAContext) {
 136                         os_log_error(TL_LOG, "Failed to LA Context: %@", error.get());
 137                         return errSecParam;
 138                 }
 139                 if (laCtx)
 140                         *laCtx = (CFTypeRef)CFRetain(LAContext);
 141         CFRef<CFDataRef> externalizedContext = LACopyACMContext(LAContext, error.take());
 142         if (!externalizedContext) {
 143             os_log_error(TL_LOG, "Failed to get externalized context: %@", error.get());
 144             return errSecParam;
 145         }
 146         CFDictionarySetValue(tokenAttributes, kSecUseCredentialReference, externalizedContext.get());
 147         CFDictionarySetValue(tokenAttributes, CFSTR("PIN"), pin);
 148     }
 149
 150     CFRef<TKTokenRef> token = TKTokenCreate(tokenAttributes, error.take());
 151     if (!token) {
 152         os_log_error(TL_LOG, "Failed to create token: %@", error.get());
 153         return errSecParam;
 154     }
 155
 156     CFRef<CFArrayRef> identities = TKTokenCopyIdentities(token, TKTokenKeyUsageAny, error.take());
 157     if (!identities || !CFArrayGetCount(identities)) {
 158         os_log_error(TL_LOG, "No identities found for token: %@", error.get());
 159         return errSecParam;
 160     }
 161
 162         CFDataRef desiredHash = getPubKeyHashWrap(context);
 163     CFIndex idx, count = CFArrayGetCount(identities);
 164     for (idx = 0; idx < count; ++idx) {
 165         SecIdentityRef identity = (SecIdentityRef)CFArrayGetValueAtIndex(identities, idx);
 166         CFRef<SecCertificateRef> certificate;
 167         OSStatus result = SecIdentityCopyCertificate(identity, certificate.take());
 168         if (result != errSecSuccess) {
 169             os_log_error(TL_LOG, "Failed to get certificate for identity: %d", (int) result);
 170             continue;
 171         }
 172
 173         CFRef<CFDataRef> identityHash = SecCertificateCopyPublicKeySHA1Digest(certificate);
 174         if (identityHash && CFEqual(desiredHash, identityHash)) {
 175             result = SecIdentityCopyPrivateKey(identity, privKey);
 176             if (result != errSecSuccess) {
 177                 os_log_error(TL_LOG, "Failed to get identity private key: %d", (int) result);
 178             }
 179             return result;
 180         }
 181     }
 182
 183     return errSecParam;
 184 }
 185
 186 OSStatus TokenLoginGetContext(const void *base64TokenLoginData, UInt32 base64TokenLoginDataLength, CFDictionaryRef *context)
 187 {
 188     if (!base64TokenLoginData || !context) {
 189         os_log_error(TL_LOG, "Get login context - wrong params");
 190         return errSecParam;
 191     }
 192
 193         // Token data are base64 encoded in password.
 194         size_t dataLen = SecBase64Decode((const char *)base64TokenLoginData, base64TokenLoginDataLength, NULL, 0);
 195         if (!dataLen) {
 196                 os_log_debug(TL_LOG, "Invalid base64 encoded token data");
 197                 return errSecParam;
 198         }
 199
 200         CFRef<CFMutableDataRef> data = CFDataCreateMutable(kCFAllocatorDefault, dataLen);
 201         dataLen = SecBase64Decode((const char *)base64TokenLoginData, base64TokenLoginDataLength, CFDataGetMutableBytePtr(data), dataLen);
 202         if (!dataLen) {
 203                 os_log_error(TL_LOG, "Invalid base64 encoded token data");
 204                 return errSecParam;
 205         }
 206         CFDataSetLength(data, dataLen);
 207
 208         // Content of the password consists of a serialized dictionary containing token ID, PIN, wrap key hash etc.
 209         CFRef<CFErrorRef> error;
 210         *context = (CFDictionaryRef)CFPropertyListCreateWithData(kCFAllocatorDefault,
 211                                                                                                                          data,
 212                                                                                                                          kCFPropertyListImmutable,
 213                                                                                                                          NULL,
 214                                                                                                                          error.take());
 215         if (!*context || CFGetTypeID(*context) != CFDictionaryGetTypeID()) {
 216                 os_log_error(TL_LOG, "Invalid token login data property list, %@", error.get());
 217                 return errSecParam;
 218         }
 219
 220         if (!getPin(*context) || !getTokenId(*context) || !getPubKeyHash(*context) || !getPubKeyHashWrap(*context)) {
 221                 os_log_error(TL_LOG, "Invalid token login data context, %@", error.get());
 222                 return errSecParam;
 223         }
 224
 225         return errSecSuccess;
 226 }
 227
 228 OSStatus TokenLoginGetUnlockKey(CFDictionaryRef context, CFDataRef *unlockKey)
 229 {
 230     if (!context || !unlockKey) {
 231         os_log_error(TL_LOG, "Get unlock key - wrong params");
 232         return errSecParam;
 233     }
 234
 235         CFRef<CFDictionaryRef> loginData;
 236         OSStatus result = TokenLoginGetLoginData(context, loginData.take());
 237         if (result != errSecSuccess) {
 238                 os_log_error(TL_LOG, "Failed to get login data: %d", (int)result);
 239                 return result;
 240         }
 241
 242         CFDataRef wrappedUnlockKey = (CFDataRef)CFDictionaryGetValue(loginData, kSecValueData);
 243         if (!wrappedUnlockKey) {
 244                 os_log_error(TL_LOG, "Wrapped unlock key not found in unlock key data");
 245                 return errSecParam;
 246         }
 247         SecKeyAlgorithm algorithm = (SecKeyAlgorithm)CFDictionaryGetValue(loginData, kSecAttrService);
 248         if (!algorithm) {
 249                 os_log_error(TL_LOG, "Algorithm not found in unlock key data");
 250                 return errSecParam;
 251         }
 252
 253         CFRef<SecKeyRef> privKey;
 254         CFRef<CFTypeRef> LAContext;
 255         result = privKeyForPubKeyHash(context, privKey.take(), LAContext.take());
 256         if (result != errSecSuccess) {
 257                 os_log_error(TL_LOG, "Failed to get private key for public key hash: %d", (int)result);
 258                 return result;
 259         }
 260
 261         CFRef<SecKeyRef> pubKey = SecKeyCopyPublicKey(privKey);
 262         if (!pubKey) {
 263                 os_log_error(TL_LOG, "Failed to get public key from private key");
 264                 return errSecParam;
 265         }
 266         CFRef<CFErrorRef> error;
 267         *unlockKey = SecKeyCreateDecryptedData(privKey,
 268                                                                                    algorithm,
 269                                                                                    wrappedUnlockKey,
 270                                                                                    error.take());
 271         if (!*unlockKey) {
 272                 os_log_error(TL_LOG, "Failed to unwrap unlock key: %@", error.get());
 273                 return errSecDecode;
 274         }
 275
 276         // we need to re-wrap already unwrapped data to avoid capturing and reusing communication with the smartcard
 277         CFRef<CFDataRef> reWrappedUnlockKey = SecKeyCreateEncryptedData(pubKey, algorithm, *unlockKey, error.take());
 278         if (!reWrappedUnlockKey) {
 279                 os_log_error(TL_LOG, "Failed to rewrap unlock key: %@", error.get());
 280                 TokenLoginDeleteUnlockData(getPubKeyHash(context));
 281                 return errSecParam;
 282         }
 283
 284         CFRef<CFMutableDictionaryRef> newDict = CFDictionaryCreateMutableCopy(kCFAllocatorDefault, 4, loginData);
 285         if (newDict) {
 286                 CFDictionarySetValue(newDict, kSecValueData, reWrappedUnlockKey);
 287                 TokenLoginStoreUnlockData(context, newDict);
 288         }
 289
 290         return errSecSuccess;
 291 }
 292
 293 OSStatus TokenLoginGetLoginData(CFDictionaryRef context, CFDictionaryRef *loginData)
 294 {
 295     os_log(TL_LOG, "secinfo TokenLoginGetLoginData");
 296     secinfo("TokenLogin", "secinfo TokenLoginGetLoginData");
 297
 298     os_log(TL_LOG, "secerror");
 299     secerror("secerror");
 300
 301     os_log(TL_LOG, "secwarning");
 302     secwarning("secwarning");
 303
 304     if (!loginData || !context) {
 305         os_log_error(TL_LOG, "Get login data - wrong params");
 306         return errSecParam;
 307     }
 308
 309         CFRef<CFStringRef> pubKeyHashHex = cfDataToHex(getPubKeyHash(context));
 310     os_log(TL_LOG, "pubkeyhash %@", pubKeyHashHex.get());
 311
 312         CFPreferencesSynchronize(kSecTokenLoginDomain, kCFPreferencesCurrentUser, kCFPreferencesAnyHost);
 313         CFRef<CFDataRef> storedData = (CFDataRef)CFPreferencesCopyValue(pubKeyHashHex, kSecTokenLoginDomain, kCFPreferencesCurrentUser, kCFPreferencesAnyHost);
 314     os_log(TL_LOG, "stored data %@", storedData.get());
 315
 316     if (!storedData) {
 317                 os_log_debug(TL_LOG, "Failed to read token login plist");
 318         os_log(TL_LOG, "Failed to read token login plist");
 319                 return errSecIO;
 320         }
 321
 322         CFRef<CFErrorRef> error;
 323         *loginData = (CFDictionaryRef)CFPropertyListCreateWithData(kCFAllocatorDefault,
 324                                                                                                                            storedData,
 325                                                                                                                            kCFPropertyListImmutable,
 326                                                                                                                            NULL,
 327                                                                                                                            error.take());
 328         if (!*loginData || CFGetTypeID(*loginData) != CFDictionaryGetTypeID()) {
 329                 os_log_error(TL_LOG, "Failed to deserialize unlock key data: %@", error.get());
 330                 return errSecParam;
 331         }
 332
 333         return errSecSuccess;
 334 }
 335
 336 OSStatus TokenLoginGetPin(CFDictionaryRef context, CFStringRef *pin)
 337 {
 338         if (!pin || !context) {
 339                 return errSecParam;
 340         }
 341         *pin = getPin(context);
 342
 343         return errSecSuccess;
 344 }
 345
 346 OSStatus TokenLoginUpdateUnlockData(CFDictionaryRef context, CFStringRef password)
 347 {
 348     if (!context) {
 349         os_log_error(TL_LOG, "Updating unlock data - wrong params");
 350         return errSecParam;
 351     }
 352
 353         CFRef<SecKeychainRef> loginKeychain;
 354         OSStatus result = SecKeychainCopyLogin(loginKeychain.take());
 355         if (result != errSecSuccess) {
 356                 os_log_error(TL_LOG, "Failed to get user keychain: %d", (int) result);
 357                 return result;
 358         }
 359
 360     return SecKeychainStoreUnlockKeyWithPubKeyHash(getPubKeyHash(context), getTokenId(context), getPubKeyHashWrap(context), loginKeychain, password);
 361 }
 362
 363 OSStatus TokenLoginCreateLoginData(CFStringRef tokenId, CFDataRef pubKeyHash, CFDataRef pubKeyHashWrap, CFDataRef unlockKey, CFDataRef scBlob)
 364 {
 365     if (!tokenId || !pubKeyHash || !pubKeyHashWrap || !unlockKey || !scBlob) {
 366         os_log_error(TL_LOG, "Create login data - wrong params");
 367         return errSecParam;
 368     }
 369
 370         CFRef<CFDictionaryRef> ctx = makeCFDictionary(3,
 371                                                                                                   kSecAttrTokenID,                      tokenId,
 372                                                                                                   kSecAttrPublicKeyHash,        pubKeyHash,
 373                                                                                                   kSecAttrAccount,                      pubKeyHashWrap
 374                                                                                                   );
 375         CFRef<SecKeyRef> privKey;
 376         OSStatus result = privKeyForPubKeyHash(ctx, privKey.take(), NULL);
 377         if (result != errSecSuccess) {
 378                 os_log_error(TL_LOG, "Failed to get private key for public key hash: %d", (int) result);
 379                 return result;
 380         }
 381
 382         CFRef<SecKeyRef> pubKey = SecKeyCopyPublicKey(privKey);
 383         if (!pubKey) {
 384                 os_log_error(TL_LOG, "Failed to get public key from private key");
 385                 return errSecParam;
 386         }
 387
 388         SecKeyAlgorithm algorithms[] = {
 389                 kSecKeyAlgorithmECIESEncryptionStandardX963SHA512AESGCM,
 390                 kSecKeyAlgorithmECIESEncryptionStandardX963SHA384AESGCM,
 391                 kSecKeyAlgorithmECIESEncryptionStandardX963SHA256AESGCM,
 392                 kSecKeyAlgorithmECIESEncryptionStandardX963SHA224AESGCM,
 393                 kSecKeyAlgorithmECIESEncryptionStandardX963SHA1AESGCM,
 394                 kSecKeyAlgorithmRSAEncryptionOAEPSHA512AESGCM,
 395                 kSecKeyAlgorithmRSAEncryptionOAEPSHA384AESGCM,
 396                 kSecKeyAlgorithmRSAEncryptionOAEPSHA256AESGCM,
 397                 kSecKeyAlgorithmRSAEncryptionOAEPSHA224AESGCM,
 398                 kSecKeyAlgorithmRSAEncryptionOAEPSHA1AESGCM
 399         };
 400
 401         SecKeyAlgorithm algorithm = NULL;
 402         for (size_t i = 0; i < sizeof(algorithms) / sizeof(*algorithms); i++) {
 403                 if (SecKeyIsAlgorithmSupported(pubKey, kSecKeyOperationTypeEncrypt, algorithms[i])
 404                         && SecKeyIsAlgorithmSupported(privKey, kSecKeyOperationTypeDecrypt, algorithms[i])) {
 405                         algorithm = algorithms[i];
 406                         break;
 407                 }
 408         }
 409         if (algorithm == NULL) {
 410                 os_log_error(TL_LOG, "Failed to find supported wrap algorithm");
 411                 return errSecParam;
 412         }
 413
 414         CFRef<CFErrorRef> error;
 415         CFRef<CFDataRef> wrappedUnlockKey = SecKeyCreateEncryptedData(pubKey, algorithm, unlockKey, error.take());
 416         if (!wrappedUnlockKey) {
 417                 os_log_error(TL_LOG, "Failed to wrap unlock key: %@", error.get());
 418                 return errSecParam;
 419         }
 420
 421         CFRef<CFDictionaryRef> loginData = makeCFDictionary(4,
 422                                                                                                                 kSecAttrService,                algorithm,
 423                                                                                                                 kSecAttrPublicKeyHash,  pubKeyHashWrap,
 424                                                                                                                 kSecValueData,                  wrappedUnlockKey.get(),
 425                                                                                                                 kSecClassKey,                   scBlob
 426                                                                                                                 );
 427         return TokenLoginStoreUnlockData(ctx, loginData);
 428 }
 429
 430 OSStatus TokenLoginStoreUnlockData(CFDictionaryRef context, CFDictionaryRef loginData)
 431 {
 432     os_log(TL_LOG, "Storing unlock data");
 433
 434         CFRef<CFErrorRef> error;
 435         CFRef<CFDataRef> data = CFPropertyListCreateData(kCFAllocatorDefault,
 436                                                                                    loginData,
 437                                                                                    kCFPropertyListBinaryFormat_v1_0,
 438                                                                                    0,
 439                                                                                    error.take());
 440         if (!data) {
 441                 os_log_error(TL_LOG, "Failed to create unlock data: %@", error.get());
 442                 return errSecInternal;
 443         }
 444     CFRef<CFStringRef> pubKeyHashHex = cfDataToHex(getPubKeyHash(context));
 445     os_log(TL_LOG, "Pubkeyhash %@", pubKeyHashHex.get());
 446
 447     CFPreferencesSetValue(pubKeyHashHex, data, kSecTokenLoginDomain, kCFPreferencesCurrentUser, kCFPreferencesAnyHost);
 448     os_log(TL_LOG, "Pubkeyhash %@", pubKeyHashHex.get());
 449
 450         CFPreferencesSynchronize(kSecTokenLoginDomain, kCFPreferencesCurrentUser, kCFPreferencesAnyHost);
 451         CFRef<CFDataRef> storedData = (CFDataRef)CFPreferencesCopyValue(pubKeyHashHex, kSecTokenLoginDomain, kCFPreferencesCurrentUser, kCFPreferencesAnyHost);
 452     os_log(TL_LOG, "Stored data %@", storedData.get());
 453
 454         if (!storedData || !CFEqual(storedData, data)) {
 455         os_log_error(TL_LOG, "Failed to write token login plist");
 456         return errSecIO;
 457     }
 458     os_log(TL_LOG, "Original data %@. Everything is OK", data.get());
 459
 460     return errSecSuccess;
 461 }
 462
 463 OSStatus TokenLoginDeleteUnlockData(CFDataRef pubKeyHash)
 464 {
 465     CFRef<CFStringRef> pubKeyHashHex = cfDataToHex(pubKeyHash);
 466         CFPreferencesSetValue(pubKeyHashHex, NULL, kSecTokenLoginDomain, kCFPreferencesCurrentUser, kCFPreferencesAnyHost);
 467         CFPreferencesSynchronize(kSecTokenLoginDomain, kCFPreferencesCurrentUser, kCFPreferencesAnyHost);
 468         CFRef<CFDataRef> storedData = (CFDataRef)CFPreferencesCopyValue(pubKeyHashHex, kSecTokenLoginDomain, kCFPreferencesCurrentUser, kCFPreferencesAnyHost);
 469
 470         if (storedData) {
 471                 os_log_error(TL_LOG, "Failed to remove unlock data");
 472                 return errSecIO;
 473         }
 474
 475     return errSecSuccess;
 476 }
 477
 478 OSStatus TokenLoginGetScBlob(CFDataRef pubKeyHashWrap, CFStringRef tokenId, CFStringRef password, CFDataRef *scBlob)
 479 {
 480         if (scBlob == NULL || password == NULL || pubKeyHashWrap == NULL || tokenId == NULL) {
 481                 os_log_error(TL_LOG, "TokenLoginGetScBlob wrong params");
 482                 return errSecParam;
 483         }
 484
 485         CFRef<CFDictionaryRef> ctx = makeCFDictionary(2,
 486                                                                                                   kSecAttrTokenID,                      tokenId,
 487                                                                                                   kSecAttrAccount,                      pubKeyHashWrap
 488                                                                                                   );
 489
 490         CFRef<SecKeyRef> privKey;
 491         OSStatus retval = privKeyForPubKeyHash(ctx, privKey.take(), NULL);
 492         if (retval != errSecSuccess) {
 493                 os_log_error(TL_LOG, "TokenLoginGetScBlob failed to get private key for public key hash: %d", (int) retval);
 494                 return retval;
 495         }
 496
 497         CFRef<SecKeyRef> pubKey = SecKeyCopyPublicKey(privKey);
 498         if (!pubKey) {
 499                 os_log_error(TL_LOG, "TokenLoginGetScBlob no pubkey");
 500                 return errSecInternal;
 501         }
 502
 503         CFRef<CFDictionaryRef> attributes = SecKeyCopyAttributes(pubKey);
 504         if (!attributes) {
 505                 os_log_error(TL_LOG, "TokenLoginGetScBlob no attributes");
 506                 return errSecInternal;
 507         }
 508
 509         aks_smartcard_mode_t mode;
 510         CFRef<CFStringRef> type = (CFStringRef)CFDictionaryGetValue(attributes, kSecAttrKeyType);
 511         if (CFEqual(type, kSecAttrKeyTypeRSA))
 512                 mode = AKS_SMARTCARD_MODE_RSA;
 513         else if (CFEqual(type, kSecAttrKeyTypeEC))
 514                 mode = AKS_SMARTCARD_MODE_ECDH;
 515         else {
 516                 os_log_error(TL_LOG, "TokenLoginGetScBlob bad type");
 517                 return errSecNotAvailable;
 518         }
 519
 520         CFRef<CFDataRef> publicBytes = SecKeyCopyExternalRepresentation(pubKey, NULL);
 521         if (!publicBytes) {
 522                 os_log_error(TL_LOG, "TokenLoginGetScBlob cannot get public bytes");
 523                 return retval;
 524         }
 525
 526         CFIndex maxLength = CFStringGetMaximumSizeForEncoding(CFStringGetLength(password), kCFStringEncodingUTF8) + 1;
 527         char* buf = (char*)malloc(maxLength);
 528         if (buf == NULL) {
 529                 os_log_error(TL_LOG, "TokenLoginGetScBlob no mem for buffer");
 530                 return retval;
 531         }
 532
 533         if (CFStringGetCString(password, buf, maxLength, kCFStringEncodingUTF8) == FALSE) {
 534                 os_log_error(TL_LOG, "TokenLoginGetScBlob no pwd cstr");
 535                 free(buf);
 536                 return retval;
 537         }
 538
 539         void *sc_blob = NULL;
 540         size_t sc_len = 0;
 541         aks_smartcard_unregister(session_keybag_handle); // just to be sure no previous registration exist
 542         kern_return_t aks_retval = aks_smartcard_register(session_keybag_handle, (uint8_t *)buf, strlen(buf), mode, (uint8_t *)CFDataGetBytePtr(publicBytes), (size_t)CFDataGetLength(publicBytes), &sc_blob, &sc_len);
 543         free(buf);
 544         os_log_debug(TL_LOG, "TokenLoginGetScBlob register result %d", aks_retval);
 545
 546         if (sc_blob) {
 547                 *scBlob = CFDataCreate(kCFAllocatorDefault, (const UInt8 *)sc_blob, (CFIndex)sc_len);
 548                 free(sc_blob);
 549         }
 550         return aks_retval;
 551 }
 552
 553 OSStatus TokenLoginUnlockKeybag(CFDictionaryRef context, CFDictionaryRef loginData)
 554 {
 555         if (!loginData || !context) {
 556                 return errSecParam;
 557         }
 558
 559         CFDataRef scBlob = (CFDataRef)CFDictionaryGetValue(loginData, kSecClassKey);
 560         if (scBlob == NULL) {
 561                 os_log_error(TL_LOG, "Failed to get scblob");
 562                 return errSecInternal;
 563         }
 564
 565         CFRef<CFErrorRef> error;
 566         CFRef<SecKeyRef> privKey;
 567         CFRef<CFTypeRef> LAContext;
 568         OSStatus retval = privKeyForPubKeyHash(context, privKey.take(), LAContext.take());
 569         if (retval != errSecSuccess) {
 570                 os_log_error(TL_LOG, "Failed to get private key for public key hash: %d", (int) retval);
 571                 return retval;
 572         }
 573
 574         CFRef<SecKeyRef> pubKey = SecKeyCopyPublicKey(privKey);
 575         if (!pubKey) {
 576                 os_log_error(TL_LOG, "Failed to get pubkey");
 577                 return retval;
 578         }
 579
 580         CFRef<CFDictionaryRef> attributes = SecKeyCopyAttributes(pubKey);
 581         if (!attributes) {
 582                 os_log_error(TL_LOG, "TokenLoginUnlockKeybag no attributes");
 583                 return errSecInternal;
 584         }
 585
 586         aks_smartcard_mode_t mode;
 587         CFStringRef type = (CFStringRef)CFDictionaryGetValue(attributes, kSecAttrKeyType);
 588         if (CFEqual(type, kSecAttrKeyTypeRSA))
 589                 mode = AKS_SMARTCARD_MODE_RSA;
 590         else if (CFEqual(type, kSecAttrKeyTypeEC))
 591                 mode = AKS_SMARTCARD_MODE_ECDH;
 592         else {
 593                 os_log_error(TL_LOG, "TokenLoginUnlockKeybag bad type");
 594                 return errSecNotAvailable;
 595         }
 596
 597         void *scChallenge = NULL;
 598         size_t scChallengeLen = 0;
 599         int res = aks_smartcard_request_unlock(session_keybag_handle, (uint8_t *)CFDataGetBytePtr(scBlob), (size_t)CFDataGetLength(scBlob), &scChallenge, &scChallengeLen);
 600         if (res != 0) {
 601                 os_log_error(TL_LOG, "TokenLoginUnlockKeybag cannot request unlock: %x", res);
 602                 return errSecInternal;
 603         }
 604         const void *scUsk = NULL;
 605         size_t scUskLen = 0;
 606         res = aks_smartcard_get_sc_usk(scChallenge, scChallengeLen, &scUsk, &scUskLen);
 607
 608         if (res != 0 || scUsk == NULL) {
 609                 free(scChallenge);
 610                 os_log_error(TL_LOG, "TokenLoginUnlockKeybag cannot get usk: %x", res);
 611                 return errSecInternal;
 612         }
 613
 614         CFRef<CFTypeRef> wrappedUsk;
 615         if (mode == AKS_SMARTCARD_MODE_ECDH) {
 616                 const void *ecPub = NULL;
 617                 size_t ecPubLen = 0;
 618                 res = aks_smartcard_get_ec_pub(scChallenge, scChallengeLen, &ecPub, &ecPubLen);
 619                 if (res != 0 || ecPub == NULL) {
 620                         free(scChallenge);
 621                         os_log_error(TL_LOG, "TokenLoginUnlockKeybag cannot get ecpub: %x", res);
 622                         return errSecInternal;
 623                 }
 624                 wrappedUsk = CFDataCreateMutable(kCFAllocatorDefault, ecPubLen + scUskLen);
 625                 if (!wrappedUsk) {
 626                         free(scChallenge);
 627                         os_log_error(TL_LOG, "TokenLoginUnlockKeybag no mem for ecpubusk");
 628                         return errSecInternal;
 629                 }
 630                 CFDataAppendBytes((CFMutableDataRef)wrappedUsk.get(), (const UInt8 *)ecPub, (CFIndex)ecPubLen);
 631                 CFDataAppendBytes((CFMutableDataRef)wrappedUsk.get(), (const UInt8 *)scUsk, (CFIndex)scUskLen);
 632         } else {
 633                 wrappedUsk = CFDataCreate(kCFAllocatorDefault, (const UInt8 *)scUsk, (CFIndex)scUskLen);
 634         }
 635         free(scChallenge);
 636         // decrypt Usk with SC
 637         CFRef<CFDataRef> unwrappedUsk = SecKeyCreateDecryptedData(privKey,
 638                                                                                                         mode == AKS_SMARTCARD_MODE_RSA ? kSecKeyAlgorithmRSAEncryptionOAEPSHA256 : kSecKeyAlgorithmECIESEncryptionAKSSmartCard,
 639                                                                                                         (CFDataRef)wrappedUsk.get(),
 640                                                                                                         error.take());
 641         if (!unwrappedUsk) {
 642                 os_log_error(TL_LOG, "TokenLoginUnlockKeybag failed to unwrap blob: %@", error.get());
 643                 return errSecInternal;
 644         }
 645
 646         void *scNewBlob = NULL;
 647         size_t scNewLen = 0;
 648         res = aks_smartcard_unlock(session_keybag_handle, (uint8_t *)CFDataGetBytePtr(scBlob), (size_t)CFDataGetLength(scBlob), (uint8_t *)CFDataGetBytePtr(unwrappedUsk), (size_t)CFDataGetLength(unwrappedUsk), &scNewBlob, &scNewLen);
 649         if (scNewBlob) {
 650                 CFRef<CFDataRef> newBlobData = CFDataCreate(kCFAllocatorDefault, (const UInt8 *)scNewBlob, (CFIndex)scNewLen);
 651                 free(scNewBlob);
 652                 CFRef<CFMutableDictionaryRef> newDict = CFDictionaryCreateMutableCopy(kCFAllocatorDefault, 4, loginData);
 653                 if (newDict) {
 654                         CFDictionarySetValue(newDict, kSecClassKey, newBlobData.get());
 655                         TokenLoginStoreUnlockData(context, newDict);
 656                 }
 657     } else {
 658         os_log_error(TL_LOG, "TokenLoginUnlockKeybag no new scblob received: %d", res);
 659     }
 660         return res;
 661 }