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/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     if (!desiredHash) {
 164         os_log_error(TL_LOG, "No wrap key in context");
 165         return errSecParam;
 166     }
 167
 168     CFIndex idx, count = CFArrayGetCount(identities);
 169     for (idx = 0; idx < count; ++idx) {
 170         SecIdentityRef identity = (SecIdentityRef)CFArrayGetValueAtIndex(identities, idx);
 171         CFRef<SecCertificateRef> certificate;
 172         OSStatus result = SecIdentityCopyCertificate(identity, certificate.take());
 173         if (result != errSecSuccess) {
 174             os_log_error(TL_LOG, "Failed to get certificate for identity: %d", (int) result);
 175             continue;
 176         }
 177
 178         CFRef<CFDataRef> identityHash = SecCertificateCopyPublicKeySHA1Digest(certificate);
 179         if (identityHash && CFEqual(desiredHash, identityHash)) {
 180             result = SecIdentityCopyPrivateKey(identity, privKey);
 181             if (result != errSecSuccess) {
 182                 os_log_error(TL_LOG, "Failed to get identity private key: %d", (int) result);
 183             }
 184             return result;
 185         }
 186     }
 187
 188     return errSecParam;
 189 }
 190
 191 OSStatus TokenLoginGetContext(const void *base64TokenLoginData, UInt32 base64TokenLoginDataLength, CFDictionaryRef *context)
 192 {
 193     if (!base64TokenLoginData || !context) {
 194         os_log_error(TL_LOG, "Get login context - wrong params");
 195         return errSecParam;
 196     }
 197
 198         // Token data are base64 encoded in password.
 199         size_t dataLen = SecBase64Decode((const char *)base64TokenLoginData, base64TokenLoginDataLength, NULL, 0);
 200         if (!dataLen) {
 201                 os_log_debug(TL_LOG, "Invalid base64 encoded token data");
 202                 return errSecParam;
 203         }
 204
 205         CFRef<CFMutableDataRef> data = CFDataCreateMutable(kCFAllocatorDefault, dataLen);
 206         dataLen = SecBase64Decode((const char *)base64TokenLoginData, base64TokenLoginDataLength, CFDataGetMutableBytePtr(data), dataLen);
 207         if (!dataLen) {
 208                 os_log_error(TL_LOG, "Invalid base64 encoded token data");
 209                 return errSecParam;
 210         }
 211         CFDataSetLength(data, dataLen);
 212
 213         // Content of the password consists of a serialized dictionary containing token ID, PIN, wrap key hash etc.
 214         CFRef<CFErrorRef> error;
 215         *context = (CFDictionaryRef)CFPropertyListCreateWithData(kCFAllocatorDefault,
 216                                                                                                                          data,
 217                                                                                                                          kCFPropertyListImmutable,
 218                                                                                                                          NULL,
 219                                                                                                                          error.take());
 220         if (!*context || CFGetTypeID(*context) != CFDictionaryGetTypeID()) {
 221                 os_log_error(TL_LOG, "Invalid token login data property list, %@", error.get());
 222                 return errSecParam;
 223         }
 224
 225         if (!getPin(*context) || !getTokenId(*context) || !getPubKeyHash(*context) || !getPubKeyHashWrap(*context)) {
 226                 os_log_error(TL_LOG, "Invalid token login data context, %@", error.get());
 227                 return errSecParam;
 228         }
 229
 230         return errSecSuccess;
 231 }
 232
 233 OSStatus TokenLoginGetUnlockKey(CFDictionaryRef context, CFDataRef *unlockKey)
 234 {
 235     if (!context || !unlockKey) {
 236         os_log_error(TL_LOG, "Get unlock key - wrong params");
 237         return errSecParam;
 238     }
 239
 240         CFRef<CFDictionaryRef> loginData;
 241         OSStatus result = TokenLoginGetLoginData(context, loginData.take());
 242         if (result != errSecSuccess) {
 243                 os_log_error(TL_LOG, "Failed to get login data: %d", (int)result);
 244                 return result;
 245         }
 246
 247         CFDataRef wrappedUnlockKey = (CFDataRef)CFDictionaryGetValue(loginData, kSecValueData);
 248         if (!wrappedUnlockKey) {
 249                 os_log_error(TL_LOG, "Wrapped unlock key not found in unlock key data");
 250                 return errSecParam;
 251         }
 252         SecKeyAlgorithm algorithm = (SecKeyAlgorithm)CFDictionaryGetValue(loginData, kSecAttrService);
 253         if (!algorithm) {
 254                 os_log_error(TL_LOG, "Algorithm not found in unlock key data");
 255                 return errSecParam;
 256         }
 257
 258         CFRef<SecKeyRef> privKey;
 259         CFRef<CFTypeRef> LAContext;
 260         result = privKeyForPubKeyHash(context, privKey.take(), LAContext.take());
 261         if (result != errSecSuccess) {
 262                 os_log_error(TL_LOG, "Failed to get private key for public key hash: %d", (int)result);
 263                 return result;
 264         }
 265
 266         CFRef<SecKeyRef> pubKey = SecKeyCopyPublicKey(privKey);
 267         if (!pubKey) {
 268                 os_log_error(TL_LOG, "Failed to get public key from private key");
 269                 return errSecParam;
 270         }
 271         CFRef<CFErrorRef> error;
 272         *unlockKey = SecKeyCreateDecryptedData(privKey,
 273                                                                                    algorithm,
 274                                                                                    wrappedUnlockKey,
 275                                                                                    error.take());
 276         if (!*unlockKey) {
 277                 os_log_error(TL_LOG, "Failed to unwrap unlock key: %@", error.get());
 278                 return errSecDecode;
 279         }
 280
 281         // we need to re-wrap already unwrapped data to avoid capturing and reusing communication with the smartcard
 282         CFRef<CFDataRef> reWrappedUnlockKey = SecKeyCreateEncryptedData(pubKey, algorithm, *unlockKey, error.take());
 283         if (!reWrappedUnlockKey) {
 284                 os_log_error(TL_LOG, "Failed to rewrap unlock key: %@", error.get());
 285                 TokenLoginDeleteUnlockData(getPubKeyHash(context));
 286                 return errSecParam;
 287         }
 288
 289         CFRef<CFMutableDictionaryRef> newDict = CFDictionaryCreateMutableCopy(kCFAllocatorDefault, 4, loginData);
 290         if (newDict) {
 291                 CFDictionarySetValue(newDict, kSecValueData, reWrappedUnlockKey);
 292                 TokenLoginStoreUnlockData(context, newDict);
 293         }
 294
 295         return errSecSuccess;
 296 }
 297
 298 OSStatus TokenLoginGetLoginData(CFDictionaryRef context, CFDictionaryRef *loginData)
 299 {
 300     if (!loginData || !context) {
 301         os_log_error(TL_LOG, "Get login data - wrong params");
 302         return errSecParam;
 303     }
 304
 305         CFRef<CFStringRef> pubKeyHashHex = cfDataToHex(getPubKeyHash(context));
 306
 307         CFPreferencesSynchronize(kSecTokenLoginDomain, kCFPreferencesCurrentUser, kCFPreferencesAnyHost);
 308         CFRef<CFDataRef> storedData = (CFDataRef)CFPreferencesCopyValue(pubKeyHashHex, kSecTokenLoginDomain, kCFPreferencesCurrentUser, kCFPreferencesAnyHost);
 309     if (!storedData) {
 310         // this is not an error, might be a normal situation if the value does not exist
 311                 os_log_debug(TL_LOG, "Failed to read token login plist");
 312                 return errSecIO;
 313         }
 314
 315         CFRef<CFErrorRef> error;
 316         *loginData = (CFDictionaryRef)CFPropertyListCreateWithData(kCFAllocatorDefault,
 317                                                                                                                            storedData,
 318                                                                                                                            kCFPropertyListImmutable,
 319                                                                                                                            NULL,
 320                                                                                                                            error.take());
 321         if (!*loginData || CFGetTypeID(*loginData) != CFDictionaryGetTypeID()) {
 322                 os_log_error(TL_LOG, "Failed to deserialize unlock key data: %@", error.get());
 323                 return errSecParam;
 324         }
 325
 326         return errSecSuccess;
 327 }
 328
 329 OSStatus TokenLoginGetPin(CFDictionaryRef context, CFStringRef *pin)
 330 {
 331         if (!pin || !context) {
 332                 return errSecParam;
 333         }
 334         *pin = getPin(context);
 335
 336         return errSecSuccess;
 337 }
 338
 339 OSStatus TokenLoginUpdateUnlockData(CFDictionaryRef context, CFStringRef password)
 340 {
 341     if (!context) {
 342         os_log_error(TL_LOG, "Updating unlock data - wrong params");
 343         return errSecParam;
 344     }
 345
 346         CFRef<SecKeychainRef> loginKeychain;
 347         OSStatus result = SecKeychainCopyLogin(loginKeychain.take());
 348         if (result != errSecSuccess) {
 349                 os_log_error(TL_LOG, "Failed to get user keychain: %d", (int) result);
 350                 return result;
 351         }
 352
 353     return SecKeychainStoreUnlockKeyWithPubKeyHash(getPubKeyHash(context), getTokenId(context), getPubKeyHashWrap(context), loginKeychain, password);
 354 }
 355
 356 OSStatus TokenLoginCreateLoginData(CFStringRef tokenId, CFDataRef pubKeyHash, CFDataRef pubKeyHashWrap, CFDataRef unlockKey, CFDataRef scBlob)
 357 {
 358     if (!tokenId || !pubKeyHash || !pubKeyHashWrap || !unlockKey || !scBlob) {
 359         os_log_error(TL_LOG, "Create login data - wrong params");
 360         return errSecParam;
 361     }
 362
 363         CFRef<CFDictionaryRef> ctx = makeCFDictionary(3,
 364                                                                                                   kSecAttrTokenID,                      tokenId,
 365                                                                                                   kSecAttrPublicKeyHash,        pubKeyHash,
 366                                                                                                   kSecAttrAccount,                      pubKeyHashWrap
 367                                                                                                   );
 368         CFRef<SecKeyRef> privKey;
 369         OSStatus result = privKeyForPubKeyHash(ctx, privKey.take(), NULL);
 370         if (result != errSecSuccess) {
 371                 os_log_error(TL_LOG, "Failed to get private key for public key hash: %d", (int) result);
 372                 return result;
 373         }
 374
 375         CFRef<SecKeyRef> pubKey = SecKeyCopyPublicKey(privKey);
 376         if (!pubKey) {
 377                 os_log_error(TL_LOG, "Failed to get public key from private key");
 378                 return errSecParam;
 379         }
 380
 381         SecKeyAlgorithm algorithms[] = {
 382                 kSecKeyAlgorithmECIESEncryptionStandardX963SHA512AESGCM,
 383                 kSecKeyAlgorithmECIESEncryptionStandardX963SHA384AESGCM,
 384                 kSecKeyAlgorithmECIESEncryptionStandardX963SHA256AESGCM,
 385                 kSecKeyAlgorithmECIESEncryptionStandardX963SHA224AESGCM,
 386                 kSecKeyAlgorithmECIESEncryptionStandardX963SHA1AESGCM,
 387                 kSecKeyAlgorithmRSAEncryptionOAEPSHA512AESGCM,
 388                 kSecKeyAlgorithmRSAEncryptionOAEPSHA384AESGCM,
 389                 kSecKeyAlgorithmRSAEncryptionOAEPSHA256AESGCM,
 390                 kSecKeyAlgorithmRSAEncryptionOAEPSHA224AESGCM,
 391                 kSecKeyAlgorithmRSAEncryptionOAEPSHA1AESGCM
 392         };
 393
 394         SecKeyAlgorithm algorithm = NULL;
 395         for (size_t i = 0; i < sizeof(algorithms) / sizeof(*algorithms); i++) {
 396                 if (SecKeyIsAlgorithmSupported(pubKey, kSecKeyOperationTypeEncrypt, algorithms[i])
 397                         && SecKeyIsAlgorithmSupported(privKey, kSecKeyOperationTypeDecrypt, algorithms[i])) {
 398                         algorithm = algorithms[i];
 399                         break;
 400                 }
 401         }
 402         if (algorithm == NULL) {
 403                 os_log_error(TL_LOG, "Failed to find supported wrap algorithm");
 404                 return errSecParam;
 405         }
 406
 407         CFRef<CFErrorRef> error;
 408         CFRef<CFDataRef> wrappedUnlockKey = SecKeyCreateEncryptedData(pubKey, algorithm, unlockKey, error.take());
 409         if (!wrappedUnlockKey) {
 410                 os_log_error(TL_LOG, "Failed to wrap unlock key: %@", error.get());
 411                 return errSecParam;
 412         }
 413
 414         CFRef<CFDictionaryRef> loginData = makeCFDictionary(4,
 415                                                                                                                 kSecAttrService,                algorithm,
 416                                                                                                                 kSecAttrPublicKeyHash,  pubKeyHashWrap,
 417                                                                                                                 kSecValueData,                  wrappedUnlockKey.get(),
 418                                                                                                                 kSecClassKey,                   scBlob
 419                                                                                                                 );
 420         return TokenLoginStoreUnlockData(ctx, loginData);
 421 }
 422
 423 OSStatus TokenLoginStoreUnlockData(CFDictionaryRef context, CFDictionaryRef loginData)
 424 {
 425     os_log(TL_LOG, "Storing unlock data");
 426
 427         CFRef<CFErrorRef> error;
 428         CFRef<CFDataRef> data = CFPropertyListCreateData(kCFAllocatorDefault,
 429                                                                                    loginData,
 430                                                                                    kCFPropertyListBinaryFormat_v1_0,
 431                                                                                    0,
 432                                                                                    error.take());
 433         if (!data) {
 434                 os_log_error(TL_LOG, "Failed to create unlock data: %@", error.get());
 435                 return errSecInternal;
 436         }
 437     CFRef<CFStringRef> pubKeyHashHex = cfDataToHex(getPubKeyHash(context));
 438     os_log(TL_LOG, "Pubkeyhash %@", pubKeyHashHex.get());
 439
 440     CFPreferencesSetValue(pubKeyHashHex, data, kSecTokenLoginDomain, kCFPreferencesCurrentUser, kCFPreferencesAnyHost);
 441     os_log(TL_LOG, "Pubkeyhash %@", pubKeyHashHex.get());
 442
 443         CFPreferencesSynchronize(kSecTokenLoginDomain, kCFPreferencesCurrentUser, kCFPreferencesAnyHost);
 444         CFRef<CFDataRef> storedData = (CFDataRef)CFPreferencesCopyValue(pubKeyHashHex, kSecTokenLoginDomain, kCFPreferencesCurrentUser, kCFPreferencesAnyHost);
 445     os_log(TL_LOG, "Stored data %@", storedData.get());
 446
 447         if (!storedData || !CFEqual(storedData, data)) {
 448         os_log_error(TL_LOG, "Failed to write token login plist");
 449         return errSecIO;
 450     }
 451     os_log(TL_LOG, "Original data %@. Everything is OK", data.get());
 452
 453     return errSecSuccess;
 454 }
 455
 456 OSStatus TokenLoginDeleteUnlockData(CFDataRef pubKeyHash)
 457 {
 458     CFRef<CFStringRef> pubKeyHashHex = cfDataToHex(pubKeyHash);
 459         CFPreferencesSetValue(pubKeyHashHex, NULL, kSecTokenLoginDomain, kCFPreferencesCurrentUser, kCFPreferencesAnyHost);
 460         CFPreferencesSynchronize(kSecTokenLoginDomain, kCFPreferencesCurrentUser, kCFPreferencesAnyHost);
 461         CFRef<CFDataRef> storedData = (CFDataRef)CFPreferencesCopyValue(pubKeyHashHex, kSecTokenLoginDomain, kCFPreferencesCurrentUser, kCFPreferencesAnyHost);
 462
 463         if (storedData) {
 464                 os_log_error(TL_LOG, "Failed to remove unlock data");
 465                 return errSecIO;
 466         }
 467
 468     return errSecSuccess;
 469 }
 470
 471 OSStatus TokenLoginGetScBlob(CFDataRef pubKeyHashWrap, CFStringRef tokenId, CFStringRef password, CFDataRef *scBlob)
 472 {
 473         if (scBlob == NULL || password == NULL || pubKeyHashWrap == NULL || tokenId == NULL) {
 474                 os_log_error(TL_LOG, "TokenLoginGetScBlob wrong params");
 475                 return errSecParam;
 476         }
 477
 478         CFRef<CFDictionaryRef> ctx = makeCFDictionary(2,
 479                                                                                                   kSecAttrTokenID,                      tokenId,
 480                                                                                                   kSecAttrAccount,                      pubKeyHashWrap
 481                                                                                                   );
 482
 483         CFRef<SecKeyRef> privKey;
 484         OSStatus retval = privKeyForPubKeyHash(ctx, privKey.take(), NULL);
 485         if (retval != errSecSuccess) {
 486                 os_log_error(TL_LOG, "TokenLoginGetScBlob failed to get private key for public key hash: %d", (int) retval);
 487                 return retval;
 488         }
 489
 490         CFRef<SecKeyRef> pubKey = SecKeyCopyPublicKey(privKey);
 491         if (!pubKey) {
 492                 os_log_error(TL_LOG, "TokenLoginGetScBlob no pubkey");
 493                 return errSecInternal;
 494         }
 495
 496         CFRef<CFDictionaryRef> attributes = SecKeyCopyAttributes(pubKey);
 497         if (!attributes) {
 498                 os_log_error(TL_LOG, "TokenLoginGetScBlob no attributes");
 499                 return errSecInternal;
 500         }
 501
 502         aks_smartcard_mode_t mode;
 503         CFRef<CFStringRef> type = (CFStringRef)CFDictionaryGetValue(attributes, kSecAttrKeyType);
 504         if (CFEqual(type, kSecAttrKeyTypeRSA))
 505                 mode = AKS_SMARTCARD_MODE_RSA;
 506         else if (CFEqual(type, kSecAttrKeyTypeEC))
 507                 mode = AKS_SMARTCARD_MODE_ECDH;
 508         else {
 509                 os_log_error(TL_LOG, "TokenLoginGetScBlob bad type");
 510                 return errSecNotAvailable;
 511         }
 512
 513         CFRef<CFDataRef> publicBytes = SecKeyCopyExternalRepresentation(pubKey, NULL);
 514         if (!publicBytes) {
 515                 os_log_error(TL_LOG, "TokenLoginGetScBlob cannot get public bytes");
 516                 return retval;
 517         }
 518
 519         CFIndex maxLength = CFStringGetMaximumSizeForEncoding(CFStringGetLength(password), kCFStringEncodingUTF8) + 1;
 520         char* buf = (char*)malloc(maxLength);
 521         if (buf == NULL) {
 522                 os_log_error(TL_LOG, "TokenLoginGetScBlob no mem for buffer");
 523                 return retval;
 524         }
 525
 526         if (CFStringGetCString(password, buf, maxLength, kCFStringEncodingUTF8) == FALSE) {
 527                 os_log_error(TL_LOG, "TokenLoginGetScBlob no pwd cstr");
 528                 free(buf);
 529                 return retval;
 530         }
 531
 532         void *sc_blob = NULL;
 533         size_t sc_len = 0;
 534         aks_smartcard_unregister(session_keybag_handle); // just to be sure no previous registration exist
 535         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);
 536         free(buf);
 537         os_log_debug(TL_LOG, "TokenLoginGetScBlob register result %d", aks_retval);
 538
 539         if (sc_blob) {
 540                 *scBlob = CFDataCreate(kCFAllocatorDefault, (const UInt8 *)sc_blob, (CFIndex)sc_len);
 541                 free(sc_blob);
 542         }
 543         return aks_retval;
 544 }
 545
 546 // context = data wrapped in password variable, loginData = dictionary from stored plist
 547 OSStatus TokenLoginUnlockKeybag(CFDictionaryRef context, CFDictionaryRef loginData)
 548 {
 549         if (!loginData || !context) {
 550                 return errSecParam;
 551         }
 552
 553         CFDataRef scBlob = (CFDataRef)CFDictionaryGetValue(loginData, kSecClassKey);
 554         if (scBlob == NULL) {
 555                 os_log_error(TL_LOG, "Failed to get scblob");
 556                 return errSecInternal;
 557         }
 558
 559     CFDataRef pubKeyWrapFromPlist = (CFDataRef)CFDictionaryGetValue(loginData, kSecAttrPublicKeyHash);
 560     if (pubKeyWrapFromPlist == NULL) {
 561         os_log_error(TL_LOG, "Failed to get wrapkey");
 562         return errSecInternal;
 563     }
 564
 565     CFRef<CFDictionaryRef> ctx = makeCFDictionary(4,
 566                                                   kSecAttrTokenID,            getTokenId(context),
 567                                                   kSecAttrService,            getPin(context),
 568                                                   kSecAttrPublicKeyHash,      getPubKeyHash(context),
 569                                                   kSecAttrAccount,            pubKeyWrapFromPlist
 570                                                   );
 571
 572         CFRef<CFErrorRef> error;
 573         CFRef<SecKeyRef> privKey;
 574         CFRef<CFTypeRef> LAContext;
 575         OSStatus retval = privKeyForPubKeyHash(ctx, privKey.take(), LAContext.take());
 576         if (retval != errSecSuccess) {
 577                 os_log_error(TL_LOG, "Failed to get private key for public key hash: %d", (int) retval);
 578                 return retval;
 579         }
 580
 581         CFRef<SecKeyRef> pubKey = SecKeyCopyPublicKey(privKey);
 582         if (!pubKey) {
 583                 os_log_error(TL_LOG, "Failed to get pubkey");
 584                 return retval;
 585         }
 586
 587         CFRef<CFDictionaryRef> attributes = SecKeyCopyAttributes(pubKey);
 588         if (!attributes) {
 589                 os_log_error(TL_LOG, "TokenLoginUnlockKeybag no attributes");
 590                 return errSecInternal;
 591         }
 592
 593         aks_smartcard_mode_t mode;
 594         CFStringRef type = (CFStringRef)CFDictionaryGetValue(attributes, kSecAttrKeyType);
 595         if (CFEqual(type, kSecAttrKeyTypeRSA))
 596                 mode = AKS_SMARTCARD_MODE_RSA;
 597         else if (CFEqual(type, kSecAttrKeyTypeEC))
 598                 mode = AKS_SMARTCARD_MODE_ECDH;
 599         else {
 600                 os_log_error(TL_LOG, "TokenLoginUnlockKeybag bad type");
 601                 return errSecNotAvailable;
 602         }
 603
 604         void *scChallenge = NULL;
 605         size_t scChallengeLen = 0;
 606         int res = aks_smartcard_request_unlock(session_keybag_handle, (uint8_t *)CFDataGetBytePtr(scBlob), (size_t)CFDataGetLength(scBlob), &scChallenge, &scChallengeLen);
 607         if (res != 0) {
 608                 os_log_error(TL_LOG, "TokenLoginUnlockKeybag cannot request unlock: %x", res);
 609                 return errSecInternal;
 610         }
 611         const void *scUsk = NULL;
 612         size_t scUskLen = 0;
 613         res = aks_smartcard_get_sc_usk(scChallenge, scChallengeLen, &scUsk, &scUskLen);
 614
 615         if (res != 0 || scUsk == NULL) {
 616                 free(scChallenge);
 617                 os_log_error(TL_LOG, "TokenLoginUnlockKeybag cannot get usk: %x", res);
 618                 return errSecInternal;
 619         }
 620
 621         CFRef<CFTypeRef> wrappedUsk;
 622         if (mode == AKS_SMARTCARD_MODE_ECDH) {
 623                 const void *ecPub = NULL;
 624                 size_t ecPubLen = 0;
 625                 res = aks_smartcard_get_ec_pub(scChallenge, scChallengeLen, &ecPub, &ecPubLen);
 626                 if (res != 0 || ecPub == NULL) {
 627                         free(scChallenge);
 628                         os_log_error(TL_LOG, "TokenLoginUnlockKeybag cannot get ecpub: %x", res);
 629                         return errSecInternal;
 630                 }
 631                 wrappedUsk = CFDataCreateMutable(kCFAllocatorDefault, ecPubLen + scUskLen);
 632                 if (!wrappedUsk) {
 633                         free(scChallenge);
 634                         os_log_error(TL_LOG, "TokenLoginUnlockKeybag no mem for ecpubusk");
 635                         return errSecInternal;
 636                 }
 637                 CFDataAppendBytes((CFMutableDataRef)wrappedUsk.get(), (const UInt8 *)ecPub, (CFIndex)ecPubLen);
 638                 CFDataAppendBytes((CFMutableDataRef)wrappedUsk.get(), (const UInt8 *)scUsk, (CFIndex)scUskLen);
 639         } else {
 640                 wrappedUsk = CFDataCreate(kCFAllocatorDefault, (const UInt8 *)scUsk, (CFIndex)scUskLen);
 641         }
 642         free(scChallenge);
 643         // decrypt Usk with SC
 644         CFRef<CFDataRef> unwrappedUsk = SecKeyCreateDecryptedData(privKey,
 645                                                                                                         mode == AKS_SMARTCARD_MODE_RSA ? kSecKeyAlgorithmRSAEncryptionOAEPSHA256 : kSecKeyAlgorithmECIESEncryptionAKSSmartCard,
 646                                                                                                         (CFDataRef)wrappedUsk.get(),
 647                                                                                                         error.take());
 648         if (!unwrappedUsk) {
 649         os_log_error(TL_LOG, "TokenLoginUnlockKeybag failed to unwrap blob: %{public}@", error.get());
 650                 return errSecInternal;
 651         }
 652
 653         void *scNewBlob = NULL;
 654         size_t scNewLen = 0;
 655         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);
 656         if (scNewBlob) {
 657                 CFRef<CFDataRef> newBlobData = CFDataCreate(kCFAllocatorDefault, (const UInt8 *)scNewBlob, (CFIndex)scNewLen);
 658                 free(scNewBlob);
 659                 CFRef<CFMutableDictionaryRef> newDict = CFDictionaryCreateMutableCopy(kCFAllocatorDefault, 4, loginData);
 660                 if (newDict) {
 661                         CFDictionarySetValue(newDict, kSecClassKey, newBlobData.get());
 662                         TokenLoginStoreUnlockData(context, newDict);
 663                 }
 664     } else {
 665         os_log_error(TL_LOG, "TokenLoginUnlockKeybag no new scblob received: %d", res);
 666     }
 667         return res;
 668 }