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         return GSS_S_UNAVAILABLE;
 272
 273     key = eap_get_eapKeyData(ctx->initiatorCtx.eap, &keyLength);
 274
 275     if (keyLength < EAP_EMSK_LEN)
 276         return GSS_S_UNAVAILABLE;
 277
 278     major = gssEapDeriveRfc3961Key(minor,
 279                                    &key[EAP_EMSK_LEN / 2],
 280                                    EAP_EMSK_LEN / 2,
 281                                    ctx->encryptionType,
 282                                    &ctx->rfc3961Key);
 283        if (GSS_ERROR(major))
 284            return major;
 285
 286     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 287                                       &ctx->checksumType);
 288     if (GSS_ERROR(major))
 289         return major;
 290
 291     major = sequenceInit(minor,
 292                          &ctx->seqState,
 293                          ctx->recvSeq,
 294                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 295                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 296                          TRUE);
 297     if (GSS_ERROR(major))
 298         return major;
 299
 300     return GSS_S_COMPLETE;
 301 }
 302
 303 static OM_uint32
 304 initBegin(OM_uint32 *minor,
 305           gss_cred_id_t cred,
 306           gss_ctx_id_t ctx,
 307           gss_name_t target,
 308           gss_OID mech,
 309           OM_uint32 reqFlags,
 310           OM_uint32 timeReq,
 311           gss_channel_bindings_t chanBindings,
 312           gss_buffer_t inputToken,
 313           gss_buffer_t outputToken)
 314 {
 315     OM_uint32 major;
 316
 317     assert(cred != GSS_C_NO_CREDENTIAL);
 318
 319     if (cred->expiryTime)
 320         ctx->expiryTime = cred->expiryTime;
 321     else if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
 322         ctx->expiryTime = 0;
 323     else
 324         ctx->expiryTime = time(NULL) + timeReq;
 325
 326     /*
 327      * The credential mutex protects its name, however we need to
 328      * explicitly lock the acceptor name (unlikely as it may be
 329      * that it has attributes set on it).
 330      */
 331     major = gssEapDuplicateName(minor, cred->name, &ctx->initiatorName);
 332     if (GSS_ERROR(major))
 333         return major;
 334
 335     GSSEAP_MUTEX_LOCK(&target->mutex);
 336
 337     major = gssEapDuplicateName(minor, target, &ctx->acceptorName);
 338     if (GSS_ERROR(major)) {
 339         GSSEAP_MUTEX_UNLOCK(&target->mutex);
 340         return major;
 341     }
 342
 343     GSSEAP_MUTEX_UNLOCK(&target->mutex);
 344
 345     if (mech == GSS_C_NULL_OID) {
 346         major = gssEapDefaultMech(minor, &ctx->mechanismUsed);
 347     } else if (gssEapIsConcreteMechanismOid(mech)) {
 348         if (!gssEapInternalizeOid(mech, &ctx->mechanismUsed))
 349             major = duplicateOid(minor, mech, &ctx->mechanismUsed);
 350     } else {
 351         major = GSS_S_BAD_MECH;
 352     }
 353     if (GSS_ERROR(major))
 354         return major;
 355
 356     /* If credentials were provided, check they're usable with this mech */
 357     if (!gssEapCredAvailable(cred, ctx->mechanismUsed))
 358         return GSS_S_BAD_MECH;
 359
 360     return GSS_S_COMPLETE;
 361 }
 362
 363 static OM_uint32
 364 eapGssSmInitIdentity(OM_uint32 *minor,
 365                      gss_cred_id_t cred,
 366                      gss_ctx_id_t ctx,
 367                      gss_name_t target,
 368                      gss_OID mech,
 369                      OM_uint32 reqFlags,
 370                      OM_uint32 timeReq,
 371                      gss_channel_bindings_t chanBindings,
 372                      gss_buffer_t inputToken,
 373                      gss_buffer_t outputToken)
 374 {
 375     OM_uint32 major;
 376     int initialContextToken;
 377
 378     initialContextToken = (inputToken->length == 0);
 379     if (!initialContextToken)
 380         return GSS_S_DEFECTIVE_TOKEN;
 381
 382     major = initBegin(minor, cred, ctx, target, mech,
 383                       reqFlags, timeReq, chanBindings,
 384                       inputToken, outputToken);
 385     if (GSS_ERROR(major))
 386         return major;
 387
 388     ctx->state = EAP_STATE_AUTHENTICATE;
 389
 390     return GSS_S_CONTINUE_NEEDED;
 391 }
 392
 393 static struct wpabuf emptyWpaBuffer;
 394
 395 static OM_uint32
 396 eapGssSmInitAuthenticate(OM_uint32 *minor,
 397                          gss_cred_id_t cred,
 398                          gss_ctx_id_t ctx,
 399                          gss_name_t target,
 400                          gss_OID mech,
 401                          OM_uint32 reqFlags,
 402                          OM_uint32 timeReq,
 403                          gss_channel_bindings_t chanBindings,
 404                          gss_buffer_t inputToken,
 405                          gss_buffer_t outputToken)
 406 {
 407     OM_uint32 major;
 408     OM_uint32 tmpMinor;
 409     int code;
 410     struct wpabuf *resp = NULL;
 411     int initialContextToken;
 412
 413     initialContextToken = (inputToken == GSS_C_NO_BUFFER ||
 414                            inputToken->length == 0);
 415
 416     major = peerConfigInit(minor, cred, ctx);
 417     if (GSS_ERROR(major))
 418         goto cleanup;
 419
 420     if (ctx->initiatorCtx.eap == NULL) {
 421         struct eap_config eapConfig;
 422
 423         memset(&eapConfig, 0, sizeof(eapConfig));
 424
 425         ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 426                                                  &gssEapPolicyCallbacks,
 427                                                  ctx,
 428                                                  &eapConfig);
 429         if (ctx->initiatorCtx.eap == NULL) {
 430             major = GSS_S_FAILURE;
 431             goto cleanup;
 432         }
 433
 434         ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 435     }
 436
 437     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 438
 439     wpabuf_set(&ctx->initiatorCtx.reqData,
 440                inputToken->value, inputToken->length);
 441
 442     major = GSS_S_CONTINUE_NEEDED;
 443
 444     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 445     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 446         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 447
 448         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 449     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 450         major = initReady(minor, ctx, reqFlags);
 451         if (GSS_ERROR(major))
 452             goto cleanup;
 453
 454         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 455         major = GSS_S_CONTINUE_NEEDED;
 456         ctx->state = EAP_STATE_EXTENSIONS_REQ;
 457     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 458         major = GSS_S_DEFECTIVE_CREDENTIAL;
 459     } else if (code == 0 && initialContextToken) {
 460         resp = &emptyWpaBuffer;
 461         major = GSS_S_CONTINUE_NEEDED;
 462     } else {
 463         major = GSS_S_DEFECTIVE_TOKEN;
 464     }
 465
 466 cleanup:
 467     if (resp != NULL) {
 468         OM_uint32 tmpMajor;
 469         gss_buffer_desc respBuf;
 470
 471         assert(major == GSS_S_CONTINUE_NEEDED);
 472
 473         respBuf.length = wpabuf_len(resp);
 474         respBuf.value = (void *)wpabuf_head(resp);
 475
 476         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 477         if (GSS_ERROR(tmpMajor)) {
 478             major = tmpMajor;
 479             *minor = tmpMinor;
 480         }
 481     }
 482
 483     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 484     peerConfigFree(&tmpMinor, ctx);
 485
 486     return major;
 487 }
 488
 489 static OM_uint32
 490 eapGssSmInitExtensionsReq(OM_uint32 *minor,
 491                           gss_cred_id_t cred,
 492                           gss_ctx_id_t ctx,
 493                           gss_name_t target,
 494                           gss_OID mech,
 495                           OM_uint32 reqFlags,
 496                           OM_uint32 timeReq,
 497                           gss_channel_bindings_t chanBindings,
 498                           gss_buffer_t inputToken,
 499                           gss_buffer_t outputToken)
 500 {
 501     OM_uint32 major;
 502
 503     major = gssEapMakeExtensions(minor, cred, ctx, chanBindings, outputToken);
 504     if (GSS_ERROR(major))
 505         return major;
 506
 507     assert(outputToken->value != NULL);
 508
 509     ctx->state = EAP_STATE_EXTENSIONS_RESP;
 510
 511     return GSS_S_CONTINUE_NEEDED;
 512 }
 513
 514 static OM_uint32
 515 eapGssSmInitExtensionsResp(OM_uint32 *minor,
 516                            gss_cred_id_t cred,
 517                            gss_ctx_id_t ctx,
 518                            gss_name_t target,
 519                            gss_OID mech,
 520                            OM_uint32 reqFlags,
 521                            OM_uint32 timeReq,
 522                            gss_channel_bindings_t chanBindings,
 523                            gss_buffer_t inputToken,
 524                            gss_buffer_t outputToken)
 525 {
 526     OM_uint32 major;
 527
 528     major = gssEapVerifyExtensions(minor, cred, ctx, chanBindings, inputToken);
 529     if (GSS_ERROR(major))
 530         return major;
 531
 532     ctx->state = EAP_STATE_ESTABLISHED;
 533
 534     return GSS_S_COMPLETE;
 535 }
 536
 537 static OM_uint32
 538 eapGssSmInitEstablished(OM_uint32 *minor,
 539                         gss_cred_id_t cred,
 540                         gss_ctx_id_t ctx,
 541                         gss_name_t target,
 542                         gss_OID mech,
 543                         OM_uint32 reqFlags,
 544                         OM_uint32 timeReq,
 545                         gss_channel_bindings_t chanBindings,
 546                         gss_buffer_t inputToken,
 547                         gss_buffer_t outputToken)
 548 {
 549     /* Called with already established context */
 550     *minor = EINVAL;
 551     return GSS_S_BAD_STATUS;
 552 }
 553
 554 static struct gss_eap_initiator_sm {
 555     enum gss_eap_token_type inputTokenType;
 556     enum gss_eap_token_type outputTokenType;
 557     OM_uint32 (*processToken)(OM_uint32 *,
 558                               gss_cred_id_t,
 559                               gss_ctx_id_t,
 560                               gss_name_t,
 561                               gss_OID,
 562                               OM_uint32,
 563                               OM_uint32,
 564                               gss_channel_bindings_t,
 565                               gss_buffer_t,
 566                               gss_buffer_t);
 567 } eapGssInitiatorSm[] = {
 568     { TOK_TYPE_NONE,    TOK_TYPE_EAP_RESP,      eapGssSmInitIdentity            },
 569     { TOK_TYPE_EAP_REQ, TOK_TYPE_EAP_RESP,      eapGssSmInitAuthenticate        },
 570     { TOK_TYPE_NONE,    TOK_TYPE_EXT_REQ,       eapGssSmInitExtensionsReq       },
 571     { TOK_TYPE_EXT_RESP,TOK_TYPE_NONE,          eapGssSmInitExtensionsResp      },
 572     { TOK_TYPE_NONE,    TOK_TYPE_NONE,          eapGssSmInitEstablished         },
 573 #ifdef GSSEAP_ENABLE_REAUTH
 574     { TOK_TYPE_GSS_REAUTH, TOK_TYPE_GSS_REAUTH, eapGssSmInitGssReauth           },
 575 #endif
 576 };
 577
 578 OM_uint32
 579 gss_init_sec_context(OM_uint32 *minor,
 580                      gss_cred_id_t cred,
 581                      gss_ctx_id_t *context_handle,
 582                      gss_name_t target_name,
 583                      gss_OID mech_type,
 584                      OM_uint32 req_flags,
 585                      OM_uint32 time_req,
 586                      gss_channel_bindings_t input_chan_bindings,
 587                      gss_buffer_t input_token,
 588                      gss_OID *actual_mech_type,
 589                      gss_buffer_t output_token,
 590                      OM_uint32 *ret_flags,
 591                      OM_uint32 *time_rec)
 592 {
 593     OM_uint32 major;
 594     OM_uint32 tmpMajor, tmpMinor;
 595     gss_ctx_id_t ctx = *context_handle;
 596     struct gss_eap_initiator_sm *sm = NULL;
 597     gss_buffer_desc innerInputToken;
 598     gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER;
 599     enum gss_eap_token_type tokType;
 600     gss_cred_id_t defaultCred = GSS_C_NO_CREDENTIAL;
 601     int initialContextToken = 0;
 602
 603     *minor = 0;
 604
 605     output_token->length = 0;
 606     output_token->value = NULL;
 607
 608     if (ctx == GSS_C_NO_CONTEXT) {
 609         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 610             return GSS_S_DEFECTIVE_TOKEN;
 611         }
 612
 613         major = gssEapAllocContext(minor, &ctx);
 614         if (GSS_ERROR(major))
 615             return major;
 616
 617         ctx->flags |= CTX_FLAG_INITIATOR;
 618
 619         initialContextToken = 1;
 620         *context_handle = ctx;
 621     }
 622
 623     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 624
 625     if (cred == GSS_C_NO_CREDENTIAL) {
 626         if (ctx->initiatorCtx.defaultCred == GSS_C_NO_CREDENTIAL) {
 627             major = gssEapAcquireCred(minor,
 628                                       GSS_C_NO_NAME,
 629                                       GSS_C_NO_BUFFER,
 630                                       time_req,
 631                                       GSS_C_NO_OID_SET,
 632                                       GSS_C_INITIATE,
 633                                       &defaultCred,
 634                                       NULL,
 635                                       NULL);
 636             if (GSS_ERROR(major))
 637                 goto cleanup;
 638         }
 639
 640         cred = ctx->initiatorCtx.defaultCred;
 641     }
 642
 643     GSSEAP_MUTEX_LOCK(&cred->mutex);
 644
 645 #ifdef GSSEAP_ENABLE_REAUTH
 646     if (initialContextToken && gssEapCanReauthP(cred, target_name, time_req))
 647             ctx->state = EAP_STATE_KRB_REAUTH_GSS;
 648 #endif
 649
 650     if ((cred->flags & CRED_FLAG_INITIATE) == 0) {
 651         major = GSS_S_NO_CRED;
 652         goto cleanup;
 653     }
 654
 655     sm = &eapGssInitiatorSm[ctx->state];
 656
 657     if (input_token != GSS_C_NO_BUFFER) {
 658         major = gssEapVerifyToken(minor, ctx, input_token,
 659                                   &tokType, &innerInputToken);
 660         if (GSS_ERROR(major))
 661             goto cleanup;
 662
 663         if (tokType != sm->inputTokenType) {
 664             major = GSS_S_DEFECTIVE_TOKEN;
 665             goto cleanup;
 666         }
 667     } else {
 668         innerInputToken.length = 0;
 669         innerInputToken.value = NULL;
 670     }
 671
 672     /*
 673      * Advance through state machine whilst empty tokens are emitted and
 674      * the status is not GSS_S_COMPLETE or an error status.
 675      */
 676     do {
 677         sm = &eapGssInitiatorSm[ctx->state];
 678
 679         major = (sm->processToken)(minor,
 680                                    cred,
 681                                    ctx,
 682                                    target_name,
 683                                    mech_type,
 684                                    req_flags,
 685                                    time_req,
 686                                    input_chan_bindings,
 687                                    &innerInputToken,
 688                                    &innerOutputToken);
 689         if (GSS_ERROR(major))
 690             goto cleanup;
 691     } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.value == NULL);
 692
 693     if (actual_mech_type != NULL) {
 694         if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
 695             duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
 696     }
 697     if (innerOutputToken.value != NULL) {
 698         tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
 699                                    sm->outputTokenType, output_token);
 700         if (GSS_ERROR(tmpMajor)) {
 701             major = tmpMajor;
 702             *minor = tmpMinor;
 703             goto cleanup;
 704         }
 705     }
 706     if (ret_flags != NULL)
 707         *ret_flags = ctx->gssFlags;
 708     if (time_rec != NULL)
 709         gssEapContextTime(&tmpMinor, ctx, time_rec);
 710
 711     assert(ctx->state == EAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
 712
 713 cleanup:
 714     if (cred != GSS_C_NO_CREDENTIAL)
 715         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
 716     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 717
 718     if (GSS_ERROR(major))
 719         gssEapReleaseContext(&tmpMinor, context_handle);
 720
 721     gss_release_buffer(&tmpMinor, &innerOutputToken);
 722
 723     return major;
 724 }
 725
 726 #ifdef GSSEAP_ENABLE_REAUTH
 727 static OM_uint32
 728 eapGssSmInitGssReauth(OM_uint32 *minor,
 729                       gss_cred_id_t cred,
 730                       gss_ctx_id_t ctx,
 731                       gss_name_t target,
 732                       gss_OID mech,
 733                       OM_uint32 reqFlags,
 734                       OM_uint32 timeReq,
 735                       gss_channel_bindings_t chanBindings,
 736                       gss_buffer_t inputToken,
 737                       gss_buffer_t outputToken)
 738 {
 739     OM_uint32 major, tmpMinor;
 740     gss_name_t mechTarget = GSS_C_NO_NAME;
 741     gss_OID actualMech = GSS_C_NO_OID;
 742     OM_uint32 gssFlags, timeRec;
 743
 744     assert(cred != GSS_C_NO_CREDENTIAL);
 745
 746     ctx->flags |= CTX_FLAG_KRB_REAUTH_GSS;
 747
 748     if (inputToken->length == 0) {
 749         major = initBegin(minor, cred, ctx, target, mech,
 750                           reqFlags, timeReq, chanBindings,
 751                           inputToken, outputToken);
 752         if (GSS_ERROR(major))
 753             goto cleanup;
 754     }
 755
 756     major = gssEapMechToGlueName(minor, target, &mechTarget);
 757     if (GSS_ERROR(major))
 758         goto cleanup;
 759
 760     major = gssInitSecContext(minor,
 761                               cred->krbCred,
 762                               &ctx->kerberosCtx,
 763                               mechTarget,
 764                               (gss_OID)gss_mech_krb5,
 765                               reqFlags, /* | GSS_C_DCE_STYLE, */
 766                               timeReq,
 767                               chanBindings,
 768                               inputToken,
 769                               &actualMech,
 770                               outputToken,
 771                               &gssFlags,
 772                               &timeRec);
 773     if (GSS_ERROR(major))
 774         goto cleanup;
 775
 776     ctx->gssFlags = gssFlags;
 777
 778     if (major == GSS_S_COMPLETE) {
 779         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 780         if (GSS_ERROR(major))
 781             goto cleanup;
 782         ctx->state = EAP_STATE_ESTABLISHED;
 783     }
 784
 785 cleanup:
 786     gssReleaseName(&tmpMinor, &mechTarget);
 787
 788     return major;
 789 }
 790 #endif /* GSSEAP_ENABLE_REAUTH */