init_sec_context.c

   1 /*
   2  * Copyright (c) 2010, JANET(UK)
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * 3. Neither the name of JANET(UK) nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include "gssapiP_eap.h"
  34
  35 #ifdef GSSEAP_ENABLE_REAUTH
  36 static OM_uint32
  37 eapGssSmInitGssReauth(OM_uint32 *minor,
  38                       gss_cred_id_t cred,
  39                       gss_ctx_id_t ctx,
  40                       gss_name_t target,
  41                       gss_OID mech,
  42                       OM_uint32 reqFlags,
  43                       OM_uint32 timeReq,
  44                       gss_channel_bindings_t chanBindings,
  45                       gss_buffer_t inputToken,
  46                       gss_buffer_t outputToken);
  47 #endif
  48
  49 static OM_uint32
  50 policyVariableToFlag(enum eapol_bool_var variable)
  51 {
  52     OM_uint32 flag = 0;
  53
  54     switch (variable) {
  55     case EAPOL_eapSuccess:
  56         flag = CTX_FLAG_EAP_SUCCESS;
  57         break;
  58     case EAPOL_eapRestart:
  59         flag = CTX_FLAG_EAP_RESTART;
  60         break;
  61     case EAPOL_eapFail:
  62         flag = CTX_FLAG_EAP_FAIL;
  63         break;
  64     case EAPOL_eapResp:
  65         flag = CTX_FLAG_EAP_RESP;
  66         break;
  67     case EAPOL_eapNoResp:
  68         flag = CTX_FLAG_EAP_NO_RESP;
  69         break;
  70     case EAPOL_eapReq:
  71         flag = CTX_FLAG_EAP_REQ;
  72         break;
  73     case EAPOL_portEnabled:
  74         flag = CTX_FLAG_EAP_PORT_ENABLED;
  75         break;
  76     case EAPOL_altAccept:
  77         flag = CTX_FLAG_EAP_ALT_ACCEPT;
  78         break;
  79     case EAPOL_altReject:
  80         flag = CTX_FLAG_EAP_ALT_REJECT;
  81         break;
  82     }
  83
  84     return flag;
  85 }
  86
  87 static struct eap_peer_config *
  88 peerGetConfig(void *ctx)
  89 {
  90     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
  91
  92     return &gssCtx->initiatorCtx.eapPeerConfig;
  93 }
  94
  95 static Boolean
  96 peerGetBool(void *data, enum eapol_bool_var variable)
  97 {
  98     gss_ctx_id_t ctx = data;
  99     OM_uint32 flag;
 100
 101     if (ctx == GSS_C_NO_CONTEXT)
 102         return FALSE;
 103
 104     flag = policyVariableToFlag(variable);
 105
 106     return ((ctx->flags & flag) != 0);
 107 }
 108
 109 static void
 110 peerSetBool(void *data, enum eapol_bool_var variable,
 111             Boolean value)
 112 {
 113     gss_ctx_id_t ctx = data;
 114     OM_uint32 flag;
 115
 116     if (ctx == GSS_C_NO_CONTEXT)
 117         return;
 118
 119     flag = policyVariableToFlag(variable);
 120
 121     if (value)
 122         ctx->flags |= flag;
 123     else
 124         ctx->flags &= ~(flag);
 125 }
 126
 127 static unsigned int
 128 peerGetInt(void *data, enum eapol_int_var variable)
 129 {
 130     gss_ctx_id_t ctx = data;
 131
 132     if (ctx == GSS_C_NO_CONTEXT)
 133         return FALSE;
 134
 135     assert(CTX_IS_INITIATOR(ctx));
 136
 137     switch (variable) {
 138     case EAPOL_idleWhile:
 139         return ctx->initiatorCtx.idleWhile;
 140         break;
 141     }
 142
 143     return 0;
 144 }
 145
 146 static void
 147 peerSetInt(void *data, enum eapol_int_var variable,
 148            unsigned int value)
 149 {
 150     gss_ctx_id_t ctx = data;
 151
 152     if (ctx == GSS_C_NO_CONTEXT)
 153         return;
 154
 155     assert(CTX_IS_INITIATOR(ctx));
 156
 157     switch (variable) {
 158     case EAPOL_idleWhile:
 159         ctx->initiatorCtx.idleWhile = value;
 160         break;
 161     }
 162 }
 163
 164 static struct wpabuf *
 165 peerGetEapReqData(void *ctx)
 166 {
 167     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
 168
 169     return &gssCtx->initiatorCtx.reqData;
 170 }
 171
 172 static void
 173 peerSetConfigBlob(void *ctx, struct wpa_config_blob *blob)
 174 {
 175 }
 176
 177 static const struct wpa_config_blob *
 178 peerGetConfigBlob(void *ctx, const char *name)
 179 {
 180     return NULL;
 181 }
 182
 183 static void
 184 peerNotifyPending(void *ctx)
 185 {
 186 }
 187
 188 static struct eapol_callbacks gssEapPolicyCallbacks = {
 189     peerGetConfig,
 190     peerGetBool,
 191     peerSetBool,
 192     peerGetInt,
 193     peerSetInt,
 194     peerGetEapReqData,
 195     peerSetConfigBlob,
 196     peerGetConfigBlob,
 197     peerNotifyPending,
 198 };
 199
 200 extern int wpa_debug_level;
 201
 202 static OM_uint32
 203 peerConfigInit(OM_uint32 *minor,
 204                gss_cred_id_t cred,
 205                gss_ctx_id_t ctx)
 206 {
 207     krb5_context krbContext;
 208     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 209     krb5_error_code code;
 210     char *identity;
 211
 212     eapPeerConfig->identity = NULL;
 213     eapPeerConfig->identity_len = 0;
 214     eapPeerConfig->password = NULL;
 215     eapPeerConfig->password_len = 0;
 216
 217     assert(cred != GSS_C_NO_CREDENTIAL);
 218
 219     GSSEAP_KRB_INIT(&krbContext);
 220
 221     eapPeerConfig->fragment_size = 1024;
 222     wpa_debug_level = 0;
 223
 224     code = krb5_unparse_name(krbContext, cred->name->krbPrincipal, &identity);
 225     if (code != 0) {
 226         *minor = code;
 227         return GSS_S_FAILURE;
 228     }
 229
 230     eapPeerConfig->identity = (unsigned char *)identity;
 231     eapPeerConfig->identity_len = strlen(identity);
 232     eapPeerConfig->password = (unsigned char *)cred->password.value;
 233     eapPeerConfig->password_len = cred->password.length;
 234
 235     return GSS_S_COMPLETE;
 236 }
 237
 238 static OM_uint32
 239 peerConfigFree(OM_uint32 *minor,
 240                gss_ctx_id_t ctx)
 241 {
 242     krb5_context krbContext;
 243     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 244
 245     GSSEAP_KRB_INIT(&krbContext);
 246
 247     krb5_free_unparsed_name(krbContext, (char *)eapPeerConfig->identity);
 248
 249     return GSS_S_COMPLETE;
 250 }
 251
 252 static OM_uint32
 253 initReady(OM_uint32 *minor, gss_ctx_id_t ctx, OM_uint32 reqFlags)
 254 {
 255     OM_uint32 major;
 256     const unsigned char *key;
 257     size_t keyLength;
 258
 259 #if 1
 260     /* XXX actually check for mutual auth */
 261     if (reqFlags & GSS_C_MUTUAL_FLAG)
 262         ctx->gssFlags |= GSS_C_MUTUAL_FLAG;
 263 #endif
 264
 265     /* Cache encryption type derived from selected mechanism OID */
 266     major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &ctx->encryptionType);
 267     if (GSS_ERROR(major))
 268         return major;
 269
 270     if (!eap_key_available(ctx->initiatorCtx.eap)) {
 271         *minor = GSSEAP_KEY_UNAVAILABLE;
 272         return GSS_S_UNAVAILABLE;
 273     }
 274
 275     key = eap_get_eapKeyData(ctx->initiatorCtx.eap, &keyLength);
 276
 277     if (keyLength < EAP_EMSK_LEN) {
 278         *minor = GSSEAP_KEY_TOO_SHORT;
 279         return GSS_S_UNAVAILABLE;
 280     }
 281
 282     major = gssEapDeriveRfc3961Key(minor,
 283                                    &key[EAP_EMSK_LEN / 2],
 284                                    EAP_EMSK_LEN / 2,
 285                                    ctx->encryptionType,
 286                                    &ctx->rfc3961Key);
 287        if (GSS_ERROR(major))
 288            return major;
 289
 290     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 291                                       &ctx->checksumType);
 292     if (GSS_ERROR(major))
 293         return major;
 294
 295     major = sequenceInit(minor,
 296                          &ctx->seqState,
 297                          ctx->recvSeq,
 298                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 299                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 300                          TRUE);
 301     if (GSS_ERROR(major))
 302         return major;
 303
 304     *minor = 0;
 305     return GSS_S_COMPLETE;
 306 }
 307
 308 static OM_uint32
 309 initBegin(OM_uint32 *minor,
 310           gss_cred_id_t cred,
 311           gss_ctx_id_t ctx,
 312           gss_name_t target,
 313           gss_OID mech,
 314           OM_uint32 reqFlags,
 315           OM_uint32 timeReq,
 316           gss_channel_bindings_t chanBindings,
 317           gss_buffer_t inputToken,
 318           gss_buffer_t outputToken)
 319 {
 320     OM_uint32 major;
 321
 322     assert(cred != GSS_C_NO_CREDENTIAL);
 323
 324     if (cred->expiryTime)
 325         ctx->expiryTime = cred->expiryTime;
 326     else if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
 327         ctx->expiryTime = 0;
 328     else
 329         ctx->expiryTime = time(NULL) + timeReq;
 330
 331     /*
 332      * The credential mutex protects its name, however we need to
 333      * explicitly lock the acceptor name (unlikely as it may be
 334      * that it has attributes set on it).
 335      */
 336     major = gssEapDuplicateName(minor, cred->name, &ctx->initiatorName);
 337     if (GSS_ERROR(major))
 338         return major;
 339
 340     GSSEAP_MUTEX_LOCK(&target->mutex);
 341
 342     major = gssEapDuplicateName(minor, target, &ctx->acceptorName);
 343     if (GSS_ERROR(major)) {
 344         GSSEAP_MUTEX_UNLOCK(&target->mutex);
 345         return major;
 346     }
 347
 348     GSSEAP_MUTEX_UNLOCK(&target->mutex);
 349
 350     if (mech == GSS_C_NULL_OID) {
 351         major = gssEapDefaultMech(minor, &ctx->mechanismUsed);
 352     } else if (gssEapIsConcreteMechanismOid(mech)) {
 353         if (!gssEapInternalizeOid(mech, &ctx->mechanismUsed))
 354             major = duplicateOid(minor, mech, &ctx->mechanismUsed);
 355     } else {
 356         *minor = GSSEAP_WRONG_MECH;
 357         major = GSS_S_BAD_MECH;
 358     }
 359     if (GSS_ERROR(major))
 360         return major;
 361
 362     /* If credentials were provided, check they're usable with this mech */
 363     if (!gssEapCredAvailable(cred, ctx->mechanismUsed))
 364         return GSS_S_BAD_MECH;
 365
 366     return GSS_S_COMPLETE;
 367 }
 368
 369 static OM_uint32
 370 eapGssSmInitIdentity(OM_uint32 *minor,
 371                      gss_cred_id_t cred,
 372                      gss_ctx_id_t ctx,
 373                      gss_name_t target,
 374                      gss_OID mech,
 375                      OM_uint32 reqFlags,
 376                      OM_uint32 timeReq,
 377                      gss_channel_bindings_t chanBindings,
 378                      gss_buffer_t inputToken,
 379                      gss_buffer_t outputToken)
 380 {
 381     OM_uint32 major;
 382     int initialContextToken;
 383
 384     initialContextToken = (inputToken->length == 0);
 385     if (!initialContextToken) {
 386         *minor = GSSEAP_WRONG_SIZE;
 387         return GSS_S_DEFECTIVE_TOKEN;
 388     }
 389
 390     major = initBegin(minor, cred, ctx, target, mech,
 391                       reqFlags, timeReq, chanBindings,
 392                       inputToken, outputToken);
 393     if (GSS_ERROR(major))
 394         return major;
 395
 396     ctx->state = EAP_STATE_AUTHENTICATE;
 397
 398     return GSS_S_CONTINUE_NEEDED;
 399 }
 400
 401 static struct wpabuf emptyWpaBuffer;
 402
 403 static OM_uint32
 404 eapGssSmInitAuthenticate(OM_uint32 *minor,
 405                          gss_cred_id_t cred,
 406                          gss_ctx_id_t ctx,
 407                          gss_name_t target,
 408                          gss_OID mech,
 409                          OM_uint32 reqFlags,
 410                          OM_uint32 timeReq,
 411                          gss_channel_bindings_t chanBindings,
 412                          gss_buffer_t inputToken,
 413                          gss_buffer_t outputToken)
 414 {
 415     OM_uint32 major;
 416     OM_uint32 tmpMinor;
 417     int code;
 418     struct wpabuf *resp = NULL;
 419     int initialContextToken;
 420
 421     initialContextToken = (inputToken == GSS_C_NO_BUFFER ||
 422                            inputToken->length == 0);
 423
 424     major = peerConfigInit(minor, cred, ctx);
 425     if (GSS_ERROR(major))
 426         goto cleanup;
 427
 428     if (ctx->initiatorCtx.eap == NULL) {
 429         struct eap_config eapConfig;
 430
 431         memset(&eapConfig, 0, sizeof(eapConfig));
 432
 433         ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 434                                                  &gssEapPolicyCallbacks,
 435                                                  ctx,
 436                                                  &eapConfig);
 437         if (ctx->initiatorCtx.eap == NULL) {
 438             *minor = GSSEAP_PEER_INIT_FAILURE;
 439             major = GSS_S_FAILURE;
 440             goto cleanup;
 441         }
 442
 443         ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 444     }
 445
 446     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 447
 448     wpabuf_set(&ctx->initiatorCtx.reqData,
 449                inputToken->value, inputToken->length);
 450
 451     major = GSS_S_CONTINUE_NEEDED;
 452
 453     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 454     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 455         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 456
 457         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 458     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 459         major = initReady(minor, ctx, reqFlags);
 460         if (GSS_ERROR(major))
 461             goto cleanup;
 462
 463         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 464         major = GSS_S_CONTINUE_NEEDED;
 465         ctx->state = EAP_STATE_EXTENSIONS_REQ;
 466     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 467         *minor = GSSEAP_PEER_AUTH_FAILURE;
 468         major = GSS_S_DEFECTIVE_CREDENTIAL;
 469     } else if (code == 0 && initialContextToken) {
 470         resp = &emptyWpaBuffer;
 471         major = GSS_S_CONTINUE_NEEDED;
 472     } else {
 473         *minor = GSSEAP_PEER_BAD_MESSAGE;
 474         major = GSS_S_DEFECTIVE_TOKEN;
 475     }
 476
 477 cleanup:
 478     if (resp != NULL) {
 479         OM_uint32 tmpMajor;
 480         gss_buffer_desc respBuf;
 481
 482         assert(major == GSS_S_CONTINUE_NEEDED);
 483
 484         respBuf.length = wpabuf_len(resp);
 485         respBuf.value = (void *)wpabuf_head(resp);
 486
 487         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 488         if (GSS_ERROR(tmpMajor)) {
 489             major = tmpMajor;
 490             *minor = tmpMinor;
 491         }
 492     }
 493
 494     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 495     peerConfigFree(&tmpMinor, ctx);
 496
 497     return major;
 498 }
 499
 500 static OM_uint32
 501 eapGssSmInitExtensionsReq(OM_uint32 *minor,
 502                           gss_cred_id_t cred,
 503                           gss_ctx_id_t ctx,
 504                           gss_name_t target,
 505                           gss_OID mech,
 506                           OM_uint32 reqFlags,
 507                           OM_uint32 timeReq,
 508                           gss_channel_bindings_t chanBindings,
 509                           gss_buffer_t inputToken,
 510                           gss_buffer_t outputToken)
 511 {
 512     OM_uint32 major;
 513
 514     major = gssEapMakeExtensions(minor, cred, ctx, chanBindings, outputToken);
 515     if (GSS_ERROR(major))
 516         return major;
 517
 518     assert(outputToken->value != NULL);
 519
 520     ctx->state = EAP_STATE_EXTENSIONS_RESP;
 521
 522     return GSS_S_CONTINUE_NEEDED;
 523 }
 524
 525 static OM_uint32
 526 eapGssSmInitExtensionsResp(OM_uint32 *minor,
 527                            gss_cred_id_t cred,
 528                            gss_ctx_id_t ctx,
 529                            gss_name_t target,
 530                            gss_OID mech,
 531                            OM_uint32 reqFlags,
 532                            OM_uint32 timeReq,
 533                            gss_channel_bindings_t chanBindings,
 534                            gss_buffer_t inputToken,
 535                            gss_buffer_t outputToken)
 536 {
 537     OM_uint32 major;
 538
 539     major = gssEapVerifyExtensions(minor, cred, ctx, chanBindings, inputToken);
 540     if (GSS_ERROR(major))
 541         return major;
 542
 543     ctx->state = EAP_STATE_ESTABLISHED;
 544
 545     return GSS_S_COMPLETE;
 546 }
 547
 548 static OM_uint32
 549 eapGssSmInitEstablished(OM_uint32 *minor,
 550                         gss_cred_id_t cred,
 551                         gss_ctx_id_t ctx,
 552                         gss_name_t target,
 553                         gss_OID mech,
 554                         OM_uint32 reqFlags,
 555                         OM_uint32 timeReq,
 556                         gss_channel_bindings_t chanBindings,
 557                         gss_buffer_t inputToken,
 558                         gss_buffer_t outputToken)
 559 {
 560     /* Called with already established context */
 561     *minor = GSSEAP_CONTEXT_ESTABLISHED;
 562     return GSS_S_BAD_STATUS;
 563 }
 564
 565 static struct gss_eap_initiator_sm {
 566     enum gss_eap_token_type inputTokenType;
 567     enum gss_eap_token_type outputTokenType;
 568     OM_uint32 (*processToken)(OM_uint32 *,
 569                               gss_cred_id_t,
 570                               gss_ctx_id_t,
 571                               gss_name_t,
 572                               gss_OID,
 573                               OM_uint32,
 574                               OM_uint32,
 575                               gss_channel_bindings_t,
 576                               gss_buffer_t,
 577                               gss_buffer_t);
 578 } eapGssInitiatorSm[] = {
 579     { TOK_TYPE_NONE,    TOK_TYPE_EAP_RESP,      eapGssSmInitIdentity            },
 580     { TOK_TYPE_EAP_REQ, TOK_TYPE_EAP_RESP,      eapGssSmInitAuthenticate        },
 581     { TOK_TYPE_NONE,    TOK_TYPE_EXT_REQ,       eapGssSmInitExtensionsReq       },
 582     { TOK_TYPE_EXT_RESP,TOK_TYPE_NONE,          eapGssSmInitExtensionsResp      },
 583     { TOK_TYPE_NONE,    TOK_TYPE_NONE,          eapGssSmInitEstablished         },
 584 #ifdef GSSEAP_ENABLE_REAUTH
 585     { TOK_TYPE_GSS_REAUTH, TOK_TYPE_GSS_REAUTH, eapGssSmInitGssReauth           },
 586 #endif
 587 };
 588
 589 OM_uint32
 590 gss_init_sec_context(OM_uint32 *minor,
 591                      gss_cred_id_t cred,
 592                      gss_ctx_id_t *context_handle,
 593                      gss_name_t target_name,
 594                      gss_OID mech_type,
 595                      OM_uint32 req_flags,
 596                      OM_uint32 time_req,
 597                      gss_channel_bindings_t input_chan_bindings,
 598                      gss_buffer_t input_token,
 599                      gss_OID *actual_mech_type,
 600                      gss_buffer_t output_token,
 601                      OM_uint32 *ret_flags,
 602                      OM_uint32 *time_rec)
 603 {
 604     OM_uint32 major;
 605     OM_uint32 tmpMajor, tmpMinor;
 606     gss_ctx_id_t ctx = *context_handle;
 607     struct gss_eap_initiator_sm *sm = NULL;
 608     gss_buffer_desc innerInputToken;
 609     gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER;
 610     enum gss_eap_token_type tokType;
 611     gss_cred_id_t defaultCred = GSS_C_NO_CREDENTIAL;
 612     int initialContextToken = 0;
 613
 614     *minor = 0;
 615
 616     output_token->length = 0;
 617     output_token->value = NULL;
 618
 619     if (ctx == GSS_C_NO_CONTEXT) {
 620         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 621             *minor = GSSEAP_WRONG_SIZE;
 622             return GSS_S_DEFECTIVE_TOKEN;
 623         }
 624
 625         major = gssEapAllocContext(minor, &ctx);
 626         if (GSS_ERROR(major))
 627             return major;
 628
 629         ctx->flags |= CTX_FLAG_INITIATOR;
 630
 631         initialContextToken = 1;
 632         *context_handle = ctx;
 633     }
 634
 635     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 636
 637     if (cred == GSS_C_NO_CREDENTIAL) {
 638         if (ctx->initiatorCtx.defaultCred == GSS_C_NO_CREDENTIAL) {
 639             major = gssEapAcquireCred(minor,
 640                                       GSS_C_NO_NAME,
 641                                       GSS_C_NO_BUFFER,
 642                                       time_req,
 643                                       GSS_C_NO_OID_SET,
 644                                       GSS_C_INITIATE,
 645                                       &defaultCred,
 646                                       NULL,
 647                                       NULL);
 648             if (GSS_ERROR(major))
 649                 goto cleanup;
 650         }
 651
 652         cred = ctx->initiatorCtx.defaultCred;
 653     }
 654
 655     GSSEAP_MUTEX_LOCK(&cred->mutex);
 656
 657 #ifdef GSSEAP_ENABLE_REAUTH
 658     if (initialContextToken && gssEapCanReauthP(cred, target_name, time_req))
 659         ctx->state = EAP_STATE_KRB_REAUTH_GSS;
 660 #endif
 661
 662     if ((cred->flags & CRED_FLAG_INITIATE) == 0) {
 663         *minor = GSSEAP_CRED_USAGE_MISMATCH;
 664         major = GSS_S_NO_CRED;
 665         goto cleanup;
 666     }
 667
 668     sm = &eapGssInitiatorSm[ctx->state];
 669
 670     if (input_token != GSS_C_NO_BUFFER) {
 671         major = gssEapVerifyToken(minor, ctx, input_token,
 672                                   &tokType, &innerInputToken);
 673         if (GSS_ERROR(major))
 674             goto cleanup;
 675
 676         if (tokType != sm->inputTokenType) {
 677             *minor = GSSEAP_WRONG_TOK_ID;
 678             major = GSS_S_DEFECTIVE_TOKEN;
 679             goto cleanup;
 680         }
 681     } else {
 682         innerInputToken.length = 0;
 683         innerInputToken.value = NULL;
 684     }
 685
 686     /*
 687      * Advance through state machine whilst empty tokens are emitted and
 688      * the status is not GSS_S_COMPLETE or an error status.
 689      */
 690     do {
 691         sm = &eapGssInitiatorSm[ctx->state];
 692
 693         major = (sm->processToken)(minor,
 694                                    cred,
 695                                    ctx,
 696                                    target_name,
 697                                    mech_type,
 698                                    req_flags,
 699                                    time_req,
 700                                    input_chan_bindings,
 701                                    &innerInputToken,
 702                                    &innerOutputToken);
 703         if (GSS_ERROR(major))
 704             goto cleanup;
 705     } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.value == NULL);
 706
 707     if (actual_mech_type != NULL) {
 708         if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
 709             duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
 710     }
 711     if (innerOutputToken.value != NULL) {
 712         tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
 713                                    sm->outputTokenType, output_token);
 714         if (GSS_ERROR(tmpMajor)) {
 715             major = tmpMajor;
 716             *minor = tmpMinor;
 717             goto cleanup;
 718         }
 719     }
 720     if (ret_flags != NULL)
 721         *ret_flags = ctx->gssFlags;
 722     if (time_rec != NULL)
 723         gssEapContextTime(&tmpMinor, ctx, time_rec);
 724
 725     assert(ctx->state == EAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
 726
 727 cleanup:
 728     if (cred != GSS_C_NO_CREDENTIAL)
 729         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
 730     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 731
 732     if (GSS_ERROR(major))
 733         gssEapReleaseContext(&tmpMinor, context_handle);
 734
 735     gss_release_buffer(&tmpMinor, &innerOutputToken);
 736
 737     return major;
 738 }
 739
 740 #ifdef GSSEAP_ENABLE_REAUTH
 741 static OM_uint32
 742 eapGssSmInitGssReauth(OM_uint32 *minor,
 743                       gss_cred_id_t cred,
 744                       gss_ctx_id_t ctx,
 745                       gss_name_t target,
 746                       gss_OID mech,
 747                       OM_uint32 reqFlags,
 748                       OM_uint32 timeReq,
 749                       gss_channel_bindings_t chanBindings,
 750                       gss_buffer_t inputToken,
 751                       gss_buffer_t outputToken)
 752 {
 753     OM_uint32 major, tmpMinor;
 754     gss_name_t mechTarget = GSS_C_NO_NAME;
 755     gss_OID actualMech = GSS_C_NO_OID;
 756     OM_uint32 gssFlags, timeRec;
 757
 758     assert(cred != GSS_C_NO_CREDENTIAL);
 759
 760     ctx->flags |= CTX_FLAG_KRB_REAUTH_GSS;
 761
 762     if (inputToken->length == 0) {
 763         major = initBegin(minor, cred, ctx, target, mech,
 764                           reqFlags, timeReq, chanBindings,
 765                           inputToken, outputToken);
 766         if (GSS_ERROR(major))
 767             goto cleanup;
 768     }
 769
 770     major = gssEapMechToGlueName(minor, target, &mechTarget);
 771     if (GSS_ERROR(major))
 772         goto cleanup;
 773
 774     major = gssInitSecContext(minor,
 775                               cred->krbCred,
 776                               &ctx->kerberosCtx,
 777                               mechTarget,
 778                               (gss_OID)gss_mech_krb5,
 779                               reqFlags, /* | GSS_C_DCE_STYLE, */
 780                               timeReq,
 781                               chanBindings,
 782                               inputToken,
 783                               &actualMech,
 784                               outputToken,
 785                               &gssFlags,
 786                               &timeRec);
 787     if (GSS_ERROR(major))
 788         goto cleanup;
 789
 790     ctx->gssFlags = gssFlags;
 791
 792     if (major == GSS_S_COMPLETE) {
 793         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 794         if (GSS_ERROR(major))
 795             goto cleanup;
 796         ctx->state = EAP_STATE_ESTABLISHED;
 797     }
 798
 799 cleanup:
 800     gssReleaseName(&tmpMinor, &mechTarget);
 801
 802     return major;
 803 }
 804 #endif /* GSSEAP_ENABLE_REAUTH */