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 static OM_uint32
  36 policyVariableToFlag(enum eapol_bool_var variable)
  37 {
  38     OM_uint32 flag = 0;
  39
  40     switch (variable) {
  41     case EAPOL_eapSuccess:
  42         flag = CTX_FLAG_EAP_SUCCESS;
  43         break;
  44     case EAPOL_eapRestart:
  45         flag = CTX_FLAG_EAP_RESTART;
  46         break;
  47     case EAPOL_eapFail:
  48         flag = CTX_FLAG_EAP_FAIL;
  49         break;
  50     case EAPOL_eapResp:
  51         flag = CTX_FLAG_EAP_RESP;
  52         break;
  53     case EAPOL_eapNoResp:
  54         flag = CTX_FLAG_EAP_NO_RESP;
  55         break;
  56     case EAPOL_eapReq:
  57         flag = CTX_FLAG_EAP_REQ;
  58         break;
  59     case EAPOL_portEnabled:
  60         flag = CTX_FLAG_EAP_PORT_ENABLED;
  61         break;
  62     case EAPOL_altAccept:
  63         flag = CTX_FLAG_EAP_ALT_ACCEPT;
  64         break;
  65     case EAPOL_altReject:
  66         flag = CTX_FLAG_EAP_ALT_REJECT;
  67         break;
  68     }
  69
  70     return flag;
  71 }
  72
  73 static struct eap_peer_config *
  74 peerGetConfig(void *ctx)
  75 {
  76     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
  77
  78     return &gssCtx->initiatorCtx.eapPeerConfig;
  79 }
  80
  81 static Boolean
  82 peerGetBool(void *data, enum eapol_bool_var variable)
  83 {
  84     gss_ctx_id_t ctx = data;
  85     OM_uint32 flag;
  86
  87     if (ctx == GSS_C_NO_CONTEXT)
  88         return FALSE;
  89
  90     flag = policyVariableToFlag(variable);
  91
  92     return ((ctx->flags & flag) != 0);
  93 }
  94
  95 static void
  96 peerSetBool(void *data, enum eapol_bool_var variable,
  97             Boolean value)
  98 {
  99     gss_ctx_id_t ctx = data;
 100     OM_uint32 flag;
 101
 102     if (ctx == GSS_C_NO_CONTEXT)
 103         return;
 104
 105     flag = policyVariableToFlag(variable);
 106
 107     if (value)
 108         ctx->flags |= flag;
 109     else
 110         ctx->flags &= ~(flag);
 111 }
 112
 113 static unsigned int
 114 peerGetInt(void *data, enum eapol_int_var variable)
 115 {
 116     gss_ctx_id_t ctx = data;
 117
 118     if (ctx == GSS_C_NO_CONTEXT)
 119         return FALSE;
 120
 121     assert(CTX_IS_INITIATOR(ctx));
 122
 123     switch (variable) {
 124     case EAPOL_idleWhile:
 125         return ctx->initiatorCtx.idleWhile;
 126         break;
 127     }
 128
 129     return 0;
 130 }
 131
 132 static void
 133 peerSetInt(void *data, enum eapol_int_var variable,
 134            unsigned int value)
 135 {
 136     gss_ctx_id_t ctx = data;
 137
 138     if (ctx == GSS_C_NO_CONTEXT)
 139         return;
 140
 141     assert(CTX_IS_INITIATOR(ctx));
 142
 143     switch (variable) {
 144     case EAPOL_idleWhile:
 145         ctx->initiatorCtx.idleWhile = value;
 146         break;
 147     }
 148 }
 149
 150 static struct wpabuf *
 151 peerGetEapReqData(void *ctx)
 152 {
 153     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
 154
 155     return &gssCtx->initiatorCtx.reqData;
 156 }
 157
 158 static void
 159 peerSetConfigBlob(void *ctx, struct wpa_config_blob *blob)
 160 {
 161 }
 162
 163 static const struct wpa_config_blob *
 164 peerGetConfigBlob(void *ctx, const char *name)
 165 {
 166     return NULL;
 167 }
 168
 169 static void
 170 peerNotifyPending(void *ctx)
 171 {
 172 }
 173
 174 static struct eapol_callbacks gssEapPolicyCallbacks = {
 175     peerGetConfig,
 176     peerGetBool,
 177     peerSetBool,
 178     peerGetInt,
 179     peerSetInt,
 180     peerGetEapReqData,
 181     peerSetConfigBlob,
 182     peerGetConfigBlob,
 183     peerNotifyPending,
 184 };
 185
 186 extern int wpa_debug_level;
 187
 188 static OM_uint32
 189 peerConfigInit(OM_uint32 *minor,
 190                gss_cred_id_t cred,
 191                gss_ctx_id_t ctx)
 192 {
 193     krb5_context krbContext;
 194     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 195     krb5_error_code code;
 196     char *identity;
 197
 198     GSSEAP_KRB_INIT(&krbContext);
 199
 200     eapPeerConfig->fragment_size = 1024;
 201     wpa_debug_level = 0;
 202
 203     code = krb5_unparse_name(krbContext, cred->name->krbPrincipal, &identity);
 204     if (code != 0) {
 205         *minor = code;
 206         return GSS_S_FAILURE;
 207     }
 208
 209     eapPeerConfig->identity = (unsigned char *)identity;
 210     eapPeerConfig->identity_len = strlen(identity);
 211     eapPeerConfig->password = (unsigned char *)cred->password.value;
 212     eapPeerConfig->password_len = cred->password.length;
 213
 214     return GSS_S_COMPLETE;
 215 }
 216
 217 static OM_uint32
 218 peerConfigFree(OM_uint32 *minor,
 219                gss_ctx_id_t ctx)
 220 {
 221     krb5_context krbContext;
 222     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 223
 224     GSSEAP_KRB_INIT(&krbContext);
 225
 226     krb5_free_unparsed_name(krbContext, (char *)eapPeerConfig->identity);
 227
 228     return GSS_S_COMPLETE;
 229 }
 230
 231 static OM_uint32
 232 initReady(OM_uint32 *minor, gss_ctx_id_t ctx)
 233 {
 234     OM_uint32 major;
 235     const unsigned char *key;
 236     size_t keyLength;
 237     krb5_enctype encryptionType;
 238     int gotKey = 0;
 239
 240     /* Cache encryption type derived from selected mechanism OID */
 241     major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &encryptionType);
 242     if (GSS_ERROR(major))
 243         return major;
 244
 245     if (encryptionType != ENCTYPE_NULL &&
 246         eap_key_available(ctx->initiatorCtx.eap)) {
 247         key = eap_get_eapKeyData(ctx->initiatorCtx.eap, &keyLength);
 248
 249         if (keyLength >= EAP_EMSK_LEN) {
 250             major = gssEapDeriveRfc3961Key(minor,
 251                                            &key[EAP_EMSK_LEN / 2],
 252                                            EAP_EMSK_LEN / 2,
 253                                            encryptionType,
 254                                            &ctx->rfc3961Key);
 255                if (GSS_ERROR(major))
 256                    return major;
 257
 258             major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 259                                               &ctx->checksumType);
 260             if (GSS_ERROR(major))
 261                 return major;
 262             gotKey++;
 263         }
 264     }
 265
 266     if (gotKey) {
 267         ctx->encryptionType = encryptionType;
 268     } else {
 269         /*
 270          * draft-howlett-eap-gss says that integrity/confidentialty should
 271          * always be advertised as available, but if we have no keying
 272          * material it seems confusing to the caller to advertise this.
 273          */
 274         ctx->gssFlags &= ~(GSS_C_INTEG_FLAG | GSS_C_CONF_FLAG);
 275     }
 276
 277     major = sequenceInit(minor,
 278                          &ctx->seqState,
 279                          ctx->recvSeq,
 280                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 281                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 282                          TRUE);
 283     if (GSS_ERROR(major))
 284         return major;
 285
 286     return GSS_S_COMPLETE;
 287 }
 288
 289 static OM_uint32
 290 initBegin(OM_uint32 *minor,
 291           gss_cred_id_t cred,
 292           gss_ctx_id_t ctx,
 293           gss_name_t target,
 294           gss_OID mech,
 295           OM_uint32 reqFlags,
 296           OM_uint32 timeReq,
 297           gss_channel_bindings_t chanBindings,
 298           gss_buffer_t inputToken,
 299           gss_buffer_t outputToken)
 300 {
 301     OM_uint32 major;
 302
 303     if (cred != GSS_C_NO_CREDENTIAL && cred->expiryTime)
 304         ctx->expiryTime = cred->expiryTime;
 305     else if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
 306         ctx->expiryTime = 0;
 307     else
 308         ctx->expiryTime = time(NULL) + timeReq;
 309
 310     if (cred != GSS_C_NO_CREDENTIAL) {
 311         major = gssEapDuplicateName(minor, cred->name, &ctx->initiatorName);
 312         if (GSS_ERROR(major))
 313             return major;
 314     }
 315
 316     major = gssEapDuplicateName(minor, target, &ctx->acceptorName);
 317     if (GSS_ERROR(major))
 318         return major;
 319
 320     if (mech == GSS_C_NULL_OID || oidEqual(mech, GSS_EAP_MECHANISM)) {
 321         major = gssEapDefaultMech(minor, &ctx->mechanismUsed);
 322     } else if (gssEapIsConcreteMechanismOid(mech)) {
 323         if (!gssEapInternalizeOid(mech, &ctx->mechanismUsed))
 324             major = duplicateOid(minor, mech, &ctx->mechanismUsed);
 325     } else {
 326         major = GSS_S_BAD_MECH;
 327     }
 328     if (GSS_ERROR(major))
 329         return major;
 330
 331     /* If credentials were provided, check they're usable with this mech */
 332     if (!gssEapCredAvailable(cred, ctx->mechanismUsed))
 333         return GSS_S_BAD_MECH;
 334
 335     return GSS_S_COMPLETE;
 336 }
 337
 338 static OM_uint32
 339 eapGssSmInitIdentity(OM_uint32 *minor,
 340                      gss_cred_id_t cred,
 341                      gss_ctx_id_t ctx,
 342                      gss_name_t target,
 343                      gss_OID mech,
 344                      OM_uint32 reqFlags,
 345                      OM_uint32 timeReq,
 346                      gss_channel_bindings_t chanBindings,
 347                      gss_buffer_t inputToken,
 348                      gss_buffer_t outputToken)
 349 {
 350     OM_uint32 major;
 351     int initialContextToken;
 352
 353     initialContextToken = (inputToken->length == 0);
 354     if (!initialContextToken)
 355         return GSS_S_DEFECTIVE_TOKEN;
 356
 357     major = initBegin(minor, cred, ctx, target, mech,
 358                       reqFlags, timeReq, chanBindings,
 359                       inputToken, outputToken);
 360     if (GSS_ERROR(major))
 361         return major;
 362
 363     ctx->state = EAP_STATE_AUTHENTICATE;
 364
 365     return GSS_S_CONTINUE_NEEDED;
 366 }
 367
 368 static struct wpabuf emptyWpaBuffer;
 369
 370 static OM_uint32
 371 eapGssSmInitAuthenticate(OM_uint32 *minor,
 372                          gss_cred_id_t cred,
 373                          gss_ctx_id_t ctx,
 374                          gss_name_t target,
 375                          gss_OID mech,
 376                          OM_uint32 reqFlags,
 377                          OM_uint32 timeReq,
 378                          gss_channel_bindings_t chanBindings,
 379                          gss_buffer_t inputToken,
 380                          gss_buffer_t outputToken)
 381 {
 382     OM_uint32 major;
 383     OM_uint32 tmpMinor;
 384     int code;
 385     struct wpabuf *resp = NULL;
 386     int initialContextToken;
 387
 388     initialContextToken = (inputToken == GSS_C_NO_BUFFER ||
 389                            inputToken->length == 0);
 390
 391     major = peerConfigInit(minor, cred, ctx);
 392     if (GSS_ERROR(major))
 393         goto cleanup;
 394
 395     if (ctx->initiatorCtx.eap == NULL) {
 396         struct eap_config eapConfig;
 397
 398         memset(&eapConfig, 0, sizeof(eapConfig));
 399
 400         ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 401                                                  &gssEapPolicyCallbacks,
 402                                                  ctx,
 403                                                  &eapConfig);
 404         if (ctx->initiatorCtx.eap == NULL) {
 405             major = GSS_S_FAILURE;
 406             goto cleanup;
 407         }
 408
 409         ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 410     }
 411
 412     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 413
 414     wpabuf_set(&ctx->initiatorCtx.reqData,
 415                inputToken->value, inputToken->length);
 416
 417     major = GSS_S_CONTINUE_NEEDED;
 418
 419     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 420     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 421         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 422
 423         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 424     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 425         major = initReady(minor, ctx);
 426         if (GSS_ERROR(major))
 427             goto cleanup;
 428
 429         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 430         major = GSS_S_CONTINUE_NEEDED;
 431         ctx->state = EAP_STATE_EXTENSIONS_REQ;
 432     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 433         major = GSS_S_DEFECTIVE_CREDENTIAL;
 434     } else if (code == 0 && initialContextToken) {
 435         resp = &emptyWpaBuffer;
 436         major = GSS_S_CONTINUE_NEEDED;
 437     } else {
 438         major = GSS_S_DEFECTIVE_TOKEN;
 439     }
 440
 441 cleanup:
 442     if (resp != NULL) {
 443         OM_uint32 tmpMajor;
 444         gss_buffer_desc respBuf;
 445
 446         assert(major == GSS_S_CONTINUE_NEEDED);
 447
 448         respBuf.length = wpabuf_len(resp);
 449         respBuf.value = (void *)wpabuf_head(resp);
 450
 451         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 452         if (GSS_ERROR(tmpMajor)) {
 453             major = tmpMajor;
 454             *minor = tmpMinor;
 455         }
 456     }
 457
 458     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 459     peerConfigFree(&tmpMinor, ctx);
 460
 461     return major;
 462 }
 463
 464 static OM_uint32
 465 initGssChannelBindings(OM_uint32 *minor,
 466                        gss_ctx_id_t ctx,
 467                        gss_channel_bindings_t chanBindings,
 468                        gss_buffer_t outputToken)
 469 {
 470     OM_uint32 major;
 471     gss_buffer_desc buffer = GSS_C_EMPTY_BUFFER;
 472
 473
 474     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
 475         buffer = chanBindings->application_data;
 476
 477     major = gssEapWrap(minor, ctx, TRUE, GSS_C_QOP_DEFAULT,
 478                        &buffer, NULL, outputToken);
 479     if (GSS_ERROR(major))
 480         return major;
 481
 482     return GSS_S_CONTINUE_NEEDED;
 483 }
 484
 485 static OM_uint32
 486 eapGssSmInitExtensionsReq(OM_uint32 *minor,
 487                           gss_cred_id_t cred,
 488                           gss_ctx_id_t ctx,
 489                           gss_name_t target,
 490                           gss_OID mech,
 491                           OM_uint32 reqFlags,
 492                           OM_uint32 timeReq,
 493                           gss_channel_bindings_t chanBindings,
 494                           gss_buffer_t inputToken,
 495                           gss_buffer_t outputToken)
 496 {
 497     OM_uint32 major, tmpMinor;
 498     gss_buffer_desc cbToken = GSS_C_EMPTY_BUFFER;
 499
 500     major = initGssChannelBindings(minor, ctx, chanBindings, &cbToken);
 501     if (GSS_ERROR(major))
 502         return major;
 503
 504     ctx->state = EAP_STATE_EXTENSIONS_RESP;
 505
 506     major = duplicateBuffer(minor, &cbToken, outputToken);
 507     if (GSS_ERROR(major)) {
 508         gss_release_buffer(&tmpMinor, &cbToken);
 509         return major;
 510     }
 511
 512     gss_release_buffer(&tmpMinor, &cbToken);
 513
 514     return GSS_S_CONTINUE_NEEDED;
 515 }
 516
 517 static OM_uint32
 518 eapGssSmInitExtensionsResp(OM_uint32 *minor,
 519                            gss_cred_id_t cred,
 520                            gss_ctx_id_t ctx,
 521                            gss_name_t target,
 522                            gss_OID mech,
 523                            OM_uint32 reqFlags,
 524                            OM_uint32 timeReq,
 525                            gss_channel_bindings_t chanBindings,
 526                            gss_buffer_t inputToken,
 527                            gss_buffer_t outputToken)
 528 {
 529     OM_uint32 major;
 530
 531     major = gssEapStoreReauthCreds(minor, ctx, cred, inputToken);
 532     if (GSS_ERROR(major))
 533         return major;
 534
 535     ctx->state = EAP_STATE_ESTABLISHED;
 536
 537     return GSS_S_COMPLETE;
 538 }
 539
 540 static OM_uint32
 541 eapGssSmInitEstablished(OM_uint32 *minor,
 542                         gss_cred_id_t cred,
 543                         gss_ctx_id_t ctx,
 544                         gss_name_t target,
 545                         gss_OID mech,
 546                         OM_uint32 reqFlags,
 547                         OM_uint32 timeReq,
 548                         gss_channel_bindings_t chanBindings,
 549                         gss_buffer_t inputToken,
 550                         gss_buffer_t outputToken)
 551 {
 552     /* Called with already established context */
 553     *minor = EINVAL;
 554     return GSS_S_BAD_STATUS;
 555 }
 556
 557 static int
 558 canReauthP(gss_cred_id_t cred)
 559 {
 560     return (cred != GSS_C_NO_CREDENTIAL &&
 561             cred->krbCred != GSS_C_NO_CREDENTIAL &&
 562             cred->expiryTime > time(NULL));
 563 }
 564
 565 static OM_uint32
 566 eapGssSmInitGssReauth(OM_uint32 *minor,
 567                       gss_cred_id_t cred,
 568                       gss_ctx_id_t ctx,
 569                       gss_name_t target,
 570                       gss_OID mech,
 571                       OM_uint32 reqFlags,
 572                       OM_uint32 timeReq,
 573                       gss_channel_bindings_t chanBindings,
 574                       gss_buffer_t inputToken,
 575                       gss_buffer_t outputToken)
 576 {
 577     OM_uint32 major, tmpMinor;
 578     gss_name_t mechTarget = GSS_C_NO_NAME;
 579     gss_OID actualMech = GSS_C_NO_OID;
 580     OM_uint32 gssFlags, timeRec;
 581
 582     assert(cred != GSS_C_NO_CREDENTIAL);
 583
 584     ctx->flags |= CTX_FLAG_KRB_REAUTH_GSS;
 585
 586     if (inputToken->length == 0) {
 587         major = initBegin(minor, cred, ctx, target, mech,
 588                           reqFlags, timeReq, chanBindings,
 589                           inputToken, outputToken);
 590         if (GSS_ERROR(major))
 591             goto cleanup;
 592     }
 593
 594     major = gssEapMechToGlueName(minor, target, &mechTarget);
 595     if (GSS_ERROR(major))
 596         goto cleanup;
 597
 598     major = gssInitSecContext(minor,
 599                               cred->krbCred,
 600                               &ctx->kerberosCtx,
 601                               mechTarget,
 602                               (gss_OID)gss_mech_krb5,
 603                               reqFlags | GSS_C_DCE_STYLE,
 604                               timeReq,
 605                               chanBindings,
 606                               inputToken,
 607                               &actualMech,
 608                               outputToken,
 609                               &gssFlags,
 610                               &timeRec);
 611     if (GSS_ERROR(major))
 612         goto cleanup;
 613
 614     ctx->gssFlags = gssFlags;
 615
 616     if (major == GSS_S_COMPLETE) {
 617         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 618         if (GSS_ERROR(major))
 619             goto cleanup;
 620
 621         ctx->state = EAP_STATE_ESTABLISHED;
 622     }
 623
 624 cleanup:
 625     gssReleaseName(&tmpMinor, &mechTarget);
 626
 627     return major;
 628 }
 629
 630 static struct gss_eap_initiator_sm {
 631     enum gss_eap_token_type inputTokenType;
 632     enum gss_eap_token_type outputTokenType;
 633     OM_uint32 (*processToken)(OM_uint32 *,
 634                               gss_cred_id_t,
 635                               gss_ctx_id_t,
 636                               gss_name_t,
 637                               gss_OID,
 638                               OM_uint32,
 639                               OM_uint32,
 640                               gss_channel_bindings_t,
 641                               gss_buffer_t,
 642                               gss_buffer_t);
 643 } eapGssInitiatorSm[] = {
 644     { TOK_TYPE_NONE,    TOK_TYPE_EAP_RESP,      eapGssSmInitIdentity            },
 645     { TOK_TYPE_EAP_REQ, TOK_TYPE_EAP_RESP,      eapGssSmInitAuthenticate        },
 646     { TOK_TYPE_NONE,    TOK_TYPE_EXT_REQ,       eapGssSmInitExtensionsReq       },
 647     { TOK_TYPE_EXT_RESP,TOK_TYPE_NONE,          eapGssSmInitExtensionsResp      },
 648     { TOK_TYPE_NONE,    TOK_TYPE_NONE,          eapGssSmInitEstablished         },
 649     { TOK_TYPE_GSS_REAUTH, TOK_TYPE_GSS_REAUTH, eapGssSmInitGssReauth           },
 650 };
 651
 652 OM_uint32
 653 gss_init_sec_context(OM_uint32 *minor,
 654                      gss_cred_id_t cred,
 655                      gss_ctx_id_t *context_handle,
 656                      gss_name_t target_name,
 657                      gss_OID mech_type,
 658                      OM_uint32 req_flags,
 659                      OM_uint32 time_req,
 660                      gss_channel_bindings_t input_chan_bindings,
 661                      gss_buffer_t input_token,
 662                      gss_OID *actual_mech_type,
 663                      gss_buffer_t output_token,
 664                      OM_uint32 *ret_flags,
 665                      OM_uint32 *time_rec)
 666 {
 667     OM_uint32 major;
 668     OM_uint32 tmpMajor, tmpMinor;
 669     gss_ctx_id_t ctx = *context_handle;
 670     struct gss_eap_initiator_sm *sm = NULL;
 671     gss_buffer_desc innerInputToken;
 672     gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER;
 673     enum gss_eap_token_type tokType;
 674
 675     *minor = 0;
 676
 677     output_token->length = 0;
 678     output_token->value = NULL;
 679
 680     if (cred != GSS_C_NO_CREDENTIAL && !(cred->flags & CRED_FLAG_INITIATE)) {
 681         return GSS_S_NO_CRED;
 682     }
 683
 684     if (ctx == GSS_C_NO_CONTEXT) {
 685         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 686             return GSS_S_DEFECTIVE_TOKEN;
 687         }
 688
 689         major = gssEapAllocContext(minor, &ctx);
 690         if (GSS_ERROR(major))
 691             return major;
 692
 693         ctx->flags |= CTX_FLAG_INITIATOR;
 694
 695         if (canReauthP(cred))
 696             ctx->state = EAP_STATE_KRB_REAUTH_GSS;
 697
 698         *context_handle = ctx;
 699     }
 700
 701     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 702
 703     sm = &eapGssInitiatorSm[ctx->state];
 704
 705     if (input_token != GSS_C_NO_BUFFER) {
 706         major = gssEapVerifyToken(minor, ctx, input_token,
 707                                   &tokType, &innerInputToken);
 708         if (GSS_ERROR(major))
 709             goto cleanup;
 710
 711         if (tokType != sm->inputTokenType) {
 712             major = GSS_S_DEFECTIVE_TOKEN;
 713             goto cleanup;
 714         }
 715     } else {
 716         innerInputToken.length = 0;
 717         innerInputToken.value = NULL;
 718     }
 719
 720     /*
 721      * Advance through state machine whilst empty tokens are emitted and
 722      * the status is not GSS_S_COMPLETE or an error status.
 723      */
 724     do {
 725         sm = &eapGssInitiatorSm[ctx->state];
 726
 727         major = (sm->processToken)(minor,
 728                                    cred,
 729                                    ctx,
 730                                    target_name,
 731                                    mech_type,
 732                                    req_flags,
 733                                    time_req,
 734                                    input_chan_bindings,
 735                                    &innerInputToken,
 736                                    &innerOutputToken);
 737         if (GSS_ERROR(major))
 738             goto cleanup;
 739     } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.value == NULL);
 740
 741     if (actual_mech_type != NULL) {
 742         if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
 743             duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
 744     }
 745     if (innerOutputToken.value != NULL) {
 746         tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
 747                                    sm->outputTokenType, output_token);
 748         if (GSS_ERROR(tmpMajor)) {
 749             major = tmpMajor;
 750             *minor = tmpMinor;
 751             goto cleanup;
 752         }
 753     }
 754     if (ret_flags != NULL)
 755         *ret_flags = ctx->gssFlags;
 756     if (time_rec != NULL)
 757         gssEapContextTime(&tmpMinor, ctx, time_rec);
 758
 759     assert(ctx->state == EAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
 760
 761 cleanup:
 762     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 763
 764     if (GSS_ERROR(major))
 765         gssEapReleaseContext(&tmpMinor, context_handle);
 766
 767     gss_release_buffer(&tmpMinor, &innerOutputToken);
 768
 769     return major;
 770 }