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 int
  37 canReauthP(gss_cred_id_t cred);
  38
  39 static OM_uint32
  40 eapGssSmInitGssReauth(OM_uint32 *minor,
  41                       gss_cred_id_t cred,
  42                       gss_ctx_id_t ctx,
  43                       gss_name_t target,
  44                       gss_OID mech,
  45                       OM_uint32 reqFlags,
  46                       OM_uint32 timeReq,
  47                       gss_channel_bindings_t chanBindings,
  48                       gss_buffer_t inputToken,
  49                       gss_buffer_t outputToken);
  50 #endif
  51
  52 static OM_uint32
  53 policyVariableToFlag(enum eapol_bool_var variable)
  54 {
  55     OM_uint32 flag = 0;
  56
  57     switch (variable) {
  58     case EAPOL_eapSuccess:
  59         flag = CTX_FLAG_EAP_SUCCESS;
  60         break;
  61     case EAPOL_eapRestart:
  62         flag = CTX_FLAG_EAP_RESTART;
  63         break;
  64     case EAPOL_eapFail:
  65         flag = CTX_FLAG_EAP_FAIL;
  66         break;
  67     case EAPOL_eapResp:
  68         flag = CTX_FLAG_EAP_RESP;
  69         break;
  70     case EAPOL_eapNoResp:
  71         flag = CTX_FLAG_EAP_NO_RESP;
  72         break;
  73     case EAPOL_eapReq:
  74         flag = CTX_FLAG_EAP_REQ;
  75         break;
  76     case EAPOL_portEnabled:
  77         flag = CTX_FLAG_EAP_PORT_ENABLED;
  78         break;
  79     case EAPOL_altAccept:
  80         flag = CTX_FLAG_EAP_ALT_ACCEPT;
  81         break;
  82     case EAPOL_altReject:
  83         flag = CTX_FLAG_EAP_ALT_REJECT;
  84         break;
  85     }
  86
  87     return flag;
  88 }
  89
  90 static struct eap_peer_config *
  91 peerGetConfig(void *ctx)
  92 {
  93     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
  94
  95     return &gssCtx->initiatorCtx.eapPeerConfig;
  96 }
  97
  98 static Boolean
  99 peerGetBool(void *data, enum eapol_bool_var variable)
 100 {
 101     gss_ctx_id_t ctx = data;
 102     OM_uint32 flag;
 103
 104     if (ctx == GSS_C_NO_CONTEXT)
 105         return FALSE;
 106
 107     flag = policyVariableToFlag(variable);
 108
 109     return ((ctx->flags & flag) != 0);
 110 }
 111
 112 static void
 113 peerSetBool(void *data, enum eapol_bool_var variable,
 114             Boolean value)
 115 {
 116     gss_ctx_id_t ctx = data;
 117     OM_uint32 flag;
 118
 119     if (ctx == GSS_C_NO_CONTEXT)
 120         return;
 121
 122     flag = policyVariableToFlag(variable);
 123
 124     if (value)
 125         ctx->flags |= flag;
 126     else
 127         ctx->flags &= ~(flag);
 128 }
 129
 130 static unsigned int
 131 peerGetInt(void *data, enum eapol_int_var variable)
 132 {
 133     gss_ctx_id_t ctx = data;
 134
 135     if (ctx == GSS_C_NO_CONTEXT)
 136         return FALSE;
 137
 138     assert(CTX_IS_INITIATOR(ctx));
 139
 140     switch (variable) {
 141     case EAPOL_idleWhile:
 142         return ctx->initiatorCtx.idleWhile;
 143         break;
 144     }
 145
 146     return 0;
 147 }
 148
 149 static void
 150 peerSetInt(void *data, enum eapol_int_var variable,
 151            unsigned int value)
 152 {
 153     gss_ctx_id_t ctx = data;
 154
 155     if (ctx == GSS_C_NO_CONTEXT)
 156         return;
 157
 158     assert(CTX_IS_INITIATOR(ctx));
 159
 160     switch (variable) {
 161     case EAPOL_idleWhile:
 162         ctx->initiatorCtx.idleWhile = value;
 163         break;
 164     }
 165 }
 166
 167 static struct wpabuf *
 168 peerGetEapReqData(void *ctx)
 169 {
 170     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
 171
 172     return &gssCtx->initiatorCtx.reqData;
 173 }
 174
 175 static void
 176 peerSetConfigBlob(void *ctx, struct wpa_config_blob *blob)
 177 {
 178 }
 179
 180 static const struct wpa_config_blob *
 181 peerGetConfigBlob(void *ctx, const char *name)
 182 {
 183     return NULL;
 184 }
 185
 186 static void
 187 peerNotifyPending(void *ctx)
 188 {
 189 }
 190
 191 static struct eapol_callbacks gssEapPolicyCallbacks = {
 192     peerGetConfig,
 193     peerGetBool,
 194     peerSetBool,
 195     peerGetInt,
 196     peerSetInt,
 197     peerGetEapReqData,
 198     peerSetConfigBlob,
 199     peerGetConfigBlob,
 200     peerNotifyPending,
 201 };
 202
 203 extern int wpa_debug_level;
 204
 205 static OM_uint32
 206 peerConfigInit(OM_uint32 *minor,
 207                gss_cred_id_t cred,
 208                gss_ctx_id_t ctx)
 209 {
 210     krb5_context krbContext;
 211     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 212     krb5_error_code code;
 213     char *identity;
 214
 215     eapPeerConfig->identity = NULL;
 216     eapPeerConfig->identity_len = 0;
 217     eapPeerConfig->password = NULL;
 218     eapPeerConfig->password_len = 0;
 219
 220     if (cred == GSS_C_NO_CREDENTIAL)
 221         return GSS_S_NO_CRED;
 222
 223     GSSEAP_KRB_INIT(&krbContext);
 224
 225     eapPeerConfig->fragment_size = 1024;
 226     wpa_debug_level = 0;
 227
 228     code = krb5_unparse_name(krbContext, cred->name->krbPrincipal, &identity);
 229     if (code != 0) {
 230         *minor = code;
 231         return GSS_S_FAILURE;
 232     }
 233
 234     eapPeerConfig->identity = (unsigned char *)identity;
 235     eapPeerConfig->identity_len = strlen(identity);
 236     eapPeerConfig->password = (unsigned char *)cred->password.value;
 237     eapPeerConfig->password_len = cred->password.length;
 238
 239     return GSS_S_COMPLETE;
 240 }
 241
 242 static OM_uint32
 243 peerConfigFree(OM_uint32 *minor,
 244                gss_ctx_id_t ctx)
 245 {
 246     krb5_context krbContext;
 247     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 248
 249     GSSEAP_KRB_INIT(&krbContext);
 250
 251     krb5_free_unparsed_name(krbContext, (char *)eapPeerConfig->identity);
 252
 253     return GSS_S_COMPLETE;
 254 }
 255
 256 static OM_uint32
 257 initReady(OM_uint32 *minor, gss_ctx_id_t ctx)
 258 {
 259     OM_uint32 major;
 260     const unsigned char *key;
 261     size_t keyLength;
 262     krb5_enctype encryptionType;
 263     int gotKey = 0;
 264
 265     /* Cache encryption type derived from selected mechanism OID */
 266     major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &encryptionType);
 267     if (GSS_ERROR(major))
 268         return major;
 269
 270     if (encryptionType != ENCTYPE_NULL &&
 271         eap_key_available(ctx->initiatorCtx.eap)) {
 272         key = eap_get_eapKeyData(ctx->initiatorCtx.eap, &keyLength);
 273
 274         if (keyLength >= EAP_EMSK_LEN) {
 275             major = gssEapDeriveRfc3961Key(minor,
 276                                            &key[EAP_EMSK_LEN / 2],
 277                                            EAP_EMSK_LEN / 2,
 278                                            encryptionType,
 279                                            &ctx->rfc3961Key);
 280                if (GSS_ERROR(major))
 281                    return major;
 282
 283             major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 284                                               &ctx->checksumType);
 285             if (GSS_ERROR(major))
 286                 return major;
 287             gotKey++;
 288         }
 289     }
 290
 291     if (gotKey) {
 292         ctx->encryptionType = encryptionType;
 293     } else {
 294         /*
 295          * draft-howlett-eap-gss says that integrity/confidentialty should
 296          * always be advertised as available, but if we have no keying
 297          * material it seems confusing to the caller to advertise this.
 298          */
 299         ctx->gssFlags &= ~(GSS_C_INTEG_FLAG | GSS_C_CONF_FLAG);
 300     }
 301
 302     major = sequenceInit(minor,
 303                          &ctx->seqState,
 304                          ctx->recvSeq,
 305                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 306                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 307                          TRUE);
 308     if (GSS_ERROR(major))
 309         return major;
 310
 311     return GSS_S_COMPLETE;
 312 }
 313
 314 static OM_uint32
 315 initBegin(OM_uint32 *minor,
 316           gss_cred_id_t cred,
 317           gss_ctx_id_t ctx,
 318           gss_name_t target,
 319           gss_OID mech,
 320           OM_uint32 reqFlags,
 321           OM_uint32 timeReq,
 322           gss_channel_bindings_t chanBindings,
 323           gss_buffer_t inputToken,
 324           gss_buffer_t outputToken)
 325 {
 326     OM_uint32 major;
 327
 328     if (cred != GSS_C_NO_CREDENTIAL && cred->expiryTime)
 329         ctx->expiryTime = cred->expiryTime;
 330     else if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
 331         ctx->expiryTime = 0;
 332     else
 333         ctx->expiryTime = time(NULL) + timeReq;
 334
 335     if (cred != GSS_C_NO_CREDENTIAL) {
 336         major = gssEapDuplicateName(minor, cred->name, &ctx->initiatorName);
 337         if (GSS_ERROR(major))
 338             return major;
 339     }
 340
 341     major = gssEapDuplicateName(minor, target, &ctx->acceptorName);
 342     if (GSS_ERROR(major))
 343         return major;
 344
 345     if (mech == GSS_C_NULL_OID || oidEqual(mech, GSS_EAP_MECHANISM)) {
 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);
 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 initGssChannelBindings(OM_uint32 *minor,
 491                        gss_ctx_id_t ctx,
 492                        gss_channel_bindings_t chanBindings,
 493                        gss_buffer_t outputToken)
 494 {
 495     OM_uint32 major;
 496     gss_buffer_desc buffer = GSS_C_EMPTY_BUFFER;
 497
 498
 499     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
 500         buffer = chanBindings->application_data;
 501
 502     major = gssEapWrap(minor, ctx, TRUE, GSS_C_QOP_DEFAULT,
 503                        &buffer, NULL, outputToken);
 504     if (GSS_ERROR(major))
 505         return major;
 506
 507     return GSS_S_CONTINUE_NEEDED;
 508 }
 509
 510 static OM_uint32
 511 eapGssSmInitExtensionsReq(OM_uint32 *minor,
 512                           gss_cred_id_t cred,
 513                           gss_ctx_id_t ctx,
 514                           gss_name_t target,
 515                           gss_OID mech,
 516                           OM_uint32 reqFlags,
 517                           OM_uint32 timeReq,
 518                           gss_channel_bindings_t chanBindings,
 519                           gss_buffer_t inputToken,
 520                           gss_buffer_t outputToken)
 521 {
 522     OM_uint32 major, tmpMinor;
 523     gss_buffer_desc cbToken = GSS_C_EMPTY_BUFFER;
 524
 525     major = initGssChannelBindings(minor, ctx, chanBindings, &cbToken);
 526     if (GSS_ERROR(major))
 527         return major;
 528
 529     ctx->state = EAP_STATE_EXTENSIONS_RESP;
 530
 531     major = duplicateBuffer(minor, &cbToken, outputToken);
 532     if (GSS_ERROR(major)) {
 533         gss_release_buffer(&tmpMinor, &cbToken);
 534         return major;
 535     }
 536
 537     gss_release_buffer(&tmpMinor, &cbToken);
 538
 539     return GSS_S_CONTINUE_NEEDED;
 540 }
 541
 542 static OM_uint32
 543 eapGssSmInitExtensionsResp(OM_uint32 *minor,
 544                            gss_cred_id_t cred,
 545                            gss_ctx_id_t ctx,
 546                            gss_name_t target,
 547                            gss_OID mech,
 548                            OM_uint32 reqFlags,
 549                            OM_uint32 timeReq,
 550                            gss_channel_bindings_t chanBindings,
 551                            gss_buffer_t inputToken,
 552                            gss_buffer_t outputToken)
 553 {
 554 #ifdef GSSEAP_ENABLE_REAUTH
 555     OM_uint32 major;
 556
 557     major = gssEapStoreReauthCreds(minor, ctx, cred, inputToken);
 558     if (GSS_ERROR(major))
 559         return major;
 560 #endif
 561
 562     ctx->state = EAP_STATE_ESTABLISHED;
 563
 564     return GSS_S_COMPLETE;
 565 }
 566
 567 static OM_uint32
 568 eapGssSmInitEstablished(OM_uint32 *minor,
 569                         gss_cred_id_t cred,
 570                         gss_ctx_id_t ctx,
 571                         gss_name_t target,
 572                         gss_OID mech,
 573                         OM_uint32 reqFlags,
 574                         OM_uint32 timeReq,
 575                         gss_channel_bindings_t chanBindings,
 576                         gss_buffer_t inputToken,
 577                         gss_buffer_t outputToken)
 578 {
 579     /* Called with already established context */
 580     *minor = EINVAL;
 581     return GSS_S_BAD_STATUS;
 582 }
 583
 584 static struct gss_eap_initiator_sm {
 585     enum gss_eap_token_type inputTokenType;
 586     enum gss_eap_token_type outputTokenType;
 587     OM_uint32 (*processToken)(OM_uint32 *,
 588                               gss_cred_id_t,
 589                               gss_ctx_id_t,
 590                               gss_name_t,
 591                               gss_OID,
 592                               OM_uint32,
 593                               OM_uint32,
 594                               gss_channel_bindings_t,
 595                               gss_buffer_t,
 596                               gss_buffer_t);
 597 } eapGssInitiatorSm[] = {
 598     { TOK_TYPE_NONE,    TOK_TYPE_EAP_RESP,      eapGssSmInitIdentity            },
 599     { TOK_TYPE_EAP_REQ, TOK_TYPE_EAP_RESP,      eapGssSmInitAuthenticate        },
 600     { TOK_TYPE_NONE,    TOK_TYPE_EXT_REQ,       eapGssSmInitExtensionsReq       },
 601     { TOK_TYPE_EXT_RESP,TOK_TYPE_NONE,          eapGssSmInitExtensionsResp      },
 602     { TOK_TYPE_NONE,    TOK_TYPE_NONE,          eapGssSmInitEstablished         },
 603 #ifdef GSSEAP_ENABLE_REAUTH
 604     { TOK_TYPE_GSS_REAUTH, TOK_TYPE_GSS_REAUTH, eapGssSmInitGssReauth           },
 605 #endif
 606 };
 607
 608 OM_uint32
 609 gss_init_sec_context(OM_uint32 *minor,
 610                      gss_cred_id_t cred,
 611                      gss_ctx_id_t *context_handle,
 612                      gss_name_t target_name,
 613                      gss_OID mech_type,
 614                      OM_uint32 req_flags,
 615                      OM_uint32 time_req,
 616                      gss_channel_bindings_t input_chan_bindings,
 617                      gss_buffer_t input_token,
 618                      gss_OID *actual_mech_type,
 619                      gss_buffer_t output_token,
 620                      OM_uint32 *ret_flags,
 621                      OM_uint32 *time_rec)
 622 {
 623     OM_uint32 major;
 624     OM_uint32 tmpMajor, tmpMinor;
 625     gss_ctx_id_t ctx = *context_handle;
 626     struct gss_eap_initiator_sm *sm = NULL;
 627     gss_buffer_desc innerInputToken;
 628     gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER;
 629     enum gss_eap_token_type tokType;
 630
 631     *minor = 0;
 632
 633     output_token->length = 0;
 634     output_token->value = NULL;
 635
 636     if (cred != GSS_C_NO_CREDENTIAL && !(cred->flags & CRED_FLAG_INITIATE)) {
 637         return GSS_S_NO_CRED;
 638     }
 639
 640     if (ctx == GSS_C_NO_CONTEXT) {
 641         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 642             return GSS_S_DEFECTIVE_TOKEN;
 643         }
 644
 645         major = gssEapAllocContext(minor, &ctx);
 646         if (GSS_ERROR(major))
 647             return major;
 648
 649         ctx->flags |= CTX_FLAG_INITIATOR;
 650
 651 #ifdef GSSEAP_ENABLE_REAUTH
 652         if (canReauthP(cred))
 653             ctx->state = EAP_STATE_KRB_REAUTH_GSS;
 654 #endif
 655
 656         *context_handle = ctx;
 657     }
 658
 659     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 660
 661     sm = &eapGssInitiatorSm[ctx->state];
 662
 663     if (input_token != GSS_C_NO_BUFFER) {
 664         major = gssEapVerifyToken(minor, ctx, input_token,
 665                                   &tokType, &innerInputToken);
 666         if (GSS_ERROR(major))
 667             goto cleanup;
 668
 669         if (tokType != sm->inputTokenType) {
 670             major = GSS_S_DEFECTIVE_TOKEN;
 671             goto cleanup;
 672         }
 673     } else {
 674         innerInputToken.length = 0;
 675         innerInputToken.value = NULL;
 676     }
 677
 678     /*
 679      * Advance through state machine whilst empty tokens are emitted and
 680      * the status is not GSS_S_COMPLETE or an error status.
 681      */
 682     do {
 683         sm = &eapGssInitiatorSm[ctx->state];
 684
 685         major = (sm->processToken)(minor,
 686                                    cred,
 687                                    ctx,
 688                                    target_name,
 689                                    mech_type,
 690                                    req_flags,
 691                                    time_req,
 692                                    input_chan_bindings,
 693                                    &innerInputToken,
 694                                    &innerOutputToken);
 695         if (GSS_ERROR(major))
 696             goto cleanup;
 697     } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.value == NULL);
 698
 699     if (actual_mech_type != NULL) {
 700         if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
 701             duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
 702     }
 703     if (innerOutputToken.value != NULL) {
 704         tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
 705                                    sm->outputTokenType, output_token);
 706         if (GSS_ERROR(tmpMajor)) {
 707             major = tmpMajor;
 708             *minor = tmpMinor;
 709             goto cleanup;
 710         }
 711     }
 712     if (ret_flags != NULL)
 713         *ret_flags = ctx->gssFlags;
 714     if (time_rec != NULL)
 715         gssEapContextTime(&tmpMinor, ctx, time_rec);
 716
 717     assert(ctx->state == EAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
 718
 719 cleanup:
 720     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 721
 722     if (GSS_ERROR(major))
 723         gssEapReleaseContext(&tmpMinor, context_handle);
 724
 725     gss_release_buffer(&tmpMinor, &innerOutputToken);
 726
 727     return major;
 728 }
 729
 730 #ifdef GSSEAP_ENABLE_REAUTH
 731 static int
 732 canReauthP(gss_cred_id_t cred)
 733 {
 734     return (cred != GSS_C_NO_CREDENTIAL &&
 735             cred->krbCred != GSS_C_NO_CREDENTIAL &&
 736             cred->expiryTime > time(NULL));
 737 }
 738
 739 static OM_uint32
 740 eapGssSmInitGssReauth(OM_uint32 *minor,
 741                       gss_cred_id_t cred,
 742                       gss_ctx_id_t ctx,
 743                       gss_name_t target,
 744                       gss_OID mech,
 745                       OM_uint32 reqFlags,
 746                       OM_uint32 timeReq,
 747                       gss_channel_bindings_t chanBindings,
 748                       gss_buffer_t inputToken,
 749                       gss_buffer_t outputToken)
 750 {
 751     OM_uint32 major, tmpMinor;
 752     gss_name_t mechTarget = GSS_C_NO_NAME;
 753     gss_OID actualMech = GSS_C_NO_OID;
 754     OM_uint32 gssFlags, timeRec;
 755
 756     assert(cred != GSS_C_NO_CREDENTIAL);
 757
 758     ctx->flags |= CTX_FLAG_KRB_REAUTH_GSS;
 759
 760     if (inputToken->length == 0) {
 761         major = initBegin(minor, cred, ctx, target, mech,
 762                           reqFlags, timeReq, chanBindings,
 763                           inputToken, outputToken);
 764         if (GSS_ERROR(major))
 765             goto cleanup;
 766     }
 767
 768     major = gssEapMechToGlueName(minor, target, &mechTarget);
 769     if (GSS_ERROR(major))
 770         goto cleanup;
 771
 772     major = gssInitSecContext(minor,
 773                               cred->krbCred,
 774                               &ctx->kerberosCtx,
 775                               mechTarget,
 776                               (gss_OID)gss_mech_krb5,
 777                               reqFlags, /* | GSS_C_DCE_STYLE, */
 778                               timeReq,
 779                               chanBindings,
 780                               inputToken,
 781                               &actualMech,
 782                               outputToken,
 783                               &gssFlags,
 784                               &timeRec);
 785     if (GSS_ERROR(major))
 786         goto cleanup;
 787
 788     ctx->gssFlags = gssFlags;
 789
 790     if (major == GSS_S_COMPLETE) {
 791         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 792         if (GSS_ERROR(major))
 793             goto cleanup;
 794         ctx->state = EAP_STATE_ESTABLISHED;
 795     }
 796
 797 cleanup:
 798     gssReleaseName(&tmpMinor, &mechTarget);
 799
 800     return major;
 801 }
 802 #endif /* GSSEAP_ENABLE_REAUTH */
 803
 804