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_GSS_CHANNEL_BINDINGS;
 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 eapGssSmInitGssChannelBindings(OM_uint32 *minor,
 466                                gss_cred_id_t cred,
 467                                gss_ctx_id_t ctx,
 468                                gss_name_t target,
 469                                gss_OID mech,
 470                                OM_uint32 reqFlags,
 471                                OM_uint32 timeReq,
 472                                gss_channel_bindings_t chanBindings,
 473                                gss_buffer_t inputToken,
 474                                gss_buffer_t outputToken)
 475 {
 476     OM_uint32 major;
 477     gss_iov_buffer_desc iov[2];
 478     gss_buffer_desc buf;
 479
 480     iov[0].type = GSS_IOV_BUFFER_TYPE_DATA;
 481     iov[0].buffer.length = 0;
 482     iov[0].buffer.value = NULL;
 483
 484     iov[1].type = GSS_IOV_BUFFER_TYPE_HEADER | GSS_IOV_BUFFER_FLAG_ALLOCATE;
 485     iov[1].buffer.length = 0;
 486     iov[1].buffer.value = NULL;
 487
 488     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
 489         iov[0].buffer = chanBindings->application_data;
 490
 491     major = gssEapWrapOrGetMIC(minor, ctx, FALSE, FALSE, iov, 2,
 492                                TOK_TYPE_GSS_CB);
 493     if (GSS_ERROR(major))
 494         goto cleanup;
 495
 496     /* Skip past token ID */
 497     assert(iov[1].buffer.length > 2);
 498     assert(load_uint16_be(iov[1].buffer.value) == TOK_TYPE_GSS_CB);
 499
 500     buf.length = iov[1].buffer.length - 2;
 501     buf.value = (unsigned char *)iov[1].buffer.value + 2;
 502
 503     major = duplicateBuffer(minor, &buf, outputToken);
 504     if (GSS_ERROR(major))
 505         goto cleanup;
 506
 507     major = GSS_S_CONTINUE_NEEDED;
 508     ctx->state = EAP_STATE_KRB_REAUTH_CRED;
 509
 510 cleanup:
 511     gssEapReleaseIov(iov, 2);
 512
 513     return major;
 514 }
 515
 516 static OM_uint32
 517 eapGssSmInitKrbReauthCred(OM_uint32 *minor,
 518                           gss_cred_id_t cred,
 519                           gss_ctx_id_t ctx,
 520                           gss_name_t target,
 521                           gss_OID mech,
 522                           OM_uint32 reqFlags,
 523                           OM_uint32 timeReq,
 524                           gss_channel_bindings_t chanBindings,
 525                           gss_buffer_t inputToken,
 526                           gss_buffer_t outputToken)
 527 {
 528     OM_uint32 major;
 529
 530     major = gssEapStoreReauthCreds(minor, ctx, cred, inputToken);
 531     if (GSS_ERROR(major))
 532         return major;
 533
 534     ctx->state = EAP_STATE_ESTABLISHED;
 535
 536     return GSS_S_COMPLETE;
 537 }
 538
 539 static OM_uint32
 540 eapGssSmInitEstablished(OM_uint32 *minor,
 541                         gss_cred_id_t cred,
 542                         gss_ctx_id_t ctx,
 543                         gss_name_t target,
 544                         gss_OID mech,
 545                         OM_uint32 reqFlags,
 546                         OM_uint32 timeReq,
 547                         gss_channel_bindings_t chanBindings,
 548                         gss_buffer_t inputToken,
 549                         gss_buffer_t outputToken)
 550 {
 551     /* Called with already established context */
 552     *minor = EINVAL;
 553     return GSS_S_BAD_STATUS;
 554 }
 555
 556 static int
 557 canReauthP(gss_cred_id_t cred)
 558 {
 559     return (cred != GSS_C_NO_CREDENTIAL &&
 560             cred->krbCred != GSS_C_NO_CREDENTIAL &&
 561             cred->expiryTime > time(NULL));
 562 }
 563
 564 static OM_uint32
 565 eapGssSmInitGssReauth(OM_uint32 *minor,
 566                       gss_cred_id_t cred,
 567                       gss_ctx_id_t ctx,
 568                       gss_name_t target,
 569                       gss_OID mech,
 570                       OM_uint32 reqFlags,
 571                       OM_uint32 timeReq,
 572                       gss_channel_bindings_t chanBindings,
 573                       gss_buffer_t inputToken,
 574                       gss_buffer_t outputToken)
 575 {
 576     OM_uint32 major, tmpMinor;
 577     gss_name_t mechTarget = GSS_C_NO_NAME;
 578     gss_OID actualMech = GSS_C_NO_OID;
 579     OM_uint32 gssFlags, timeRec;
 580
 581     assert(cred != GSS_C_NO_CREDENTIAL);
 582
 583     ctx->flags |= CTX_FLAG_KRB_REAUTH_GSS;
 584
 585     if (inputToken->length == 0) {
 586         major = initBegin(minor, cred, ctx, target, mech,
 587                           reqFlags, timeReq, chanBindings,
 588                           inputToken, outputToken);
 589         if (GSS_ERROR(major))
 590             goto cleanup;
 591     }
 592
 593     major = gssEapMechToGlueName(minor, target, &mechTarget);
 594     if (GSS_ERROR(major))
 595         goto cleanup;
 596
 597     major = gssInitSecContext(minor,
 598                               cred->krbCred,
 599                               &ctx->kerberosCtx,
 600                               mechTarget,
 601                               (gss_OID)gss_mech_krb5,
 602                               reqFlags | GSS_C_DCE_STYLE,
 603                               timeReq,
 604                               chanBindings,
 605                               inputToken,
 606                               &actualMech,
 607                               outputToken,
 608                               &gssFlags,
 609                               &timeRec);
 610     if (GSS_ERROR(major))
 611         goto cleanup;
 612
 613     ctx->gssFlags = gssFlags;
 614
 615     if (major == GSS_S_COMPLETE) {
 616         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 617         if (GSS_ERROR(major))
 618             goto cleanup;
 619
 620         ctx->state = EAP_STATE_ESTABLISHED;
 621     }
 622
 623 cleanup:
 624     gssReleaseName(&tmpMinor, &mechTarget);
 625
 626     return major;
 627 }
 628
 629 static struct gss_eap_initiator_sm {
 630     enum gss_eap_token_type inputTokenType;
 631     enum gss_eap_token_type outputTokenType;
 632     OM_uint32 (*processToken)(OM_uint32 *,
 633                               gss_cred_id_t,
 634                               gss_ctx_id_t,
 635                               gss_name_t,
 636                               gss_OID,
 637                               OM_uint32,
 638                               OM_uint32,
 639                               gss_channel_bindings_t,
 640                               gss_buffer_t,
 641                               gss_buffer_t);
 642 } eapGssInitiatorSm[] = {
 643     { TOK_TYPE_NONE,    TOK_TYPE_EAP_RESP,      eapGssSmInitIdentity            },
 644     { TOK_TYPE_EAP_REQ, TOK_TYPE_EAP_RESP,      eapGssSmInitAuthenticate        },
 645     { TOK_TYPE_NONE,    TOK_TYPE_GSS_CB,        eapGssSmInitGssChannelBindings  },
 646     { TOK_TYPE_KRB_CRED,TOK_TYPE_NONE,          eapGssSmInitKrbReauthCred       },
 647     { TOK_TYPE_NONE,    TOK_TYPE_NONE,          eapGssSmInitEstablished         },
 648     { TOK_TYPE_GSS_REAUTH, TOK_TYPE_GSS_REAUTH, eapGssSmInitGssReauth           },
 649 };
 650
 651 OM_uint32
 652 gss_init_sec_context(OM_uint32 *minor,
 653                      gss_cred_id_t cred,
 654                      gss_ctx_id_t *context_handle,
 655                      gss_name_t target_name,
 656                      gss_OID mech_type,
 657                      OM_uint32 req_flags,
 658                      OM_uint32 time_req,
 659                      gss_channel_bindings_t input_chan_bindings,
 660                      gss_buffer_t input_token,
 661                      gss_OID *actual_mech_type,
 662                      gss_buffer_t output_token,
 663                      OM_uint32 *ret_flags,
 664                      OM_uint32 *time_rec)
 665 {
 666     OM_uint32 major;
 667     OM_uint32 tmpMajor, tmpMinor;
 668     gss_ctx_id_t ctx = *context_handle;
 669     struct gss_eap_initiator_sm *sm = NULL;
 670     gss_buffer_desc innerInputToken;
 671     gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER;
 672     enum gss_eap_token_type tokType;
 673
 674     *minor = 0;
 675
 676     output_token->length = 0;
 677     output_token->value = NULL;
 678
 679     if (cred != GSS_C_NO_CREDENTIAL && !(cred->flags & CRED_FLAG_INITIATE)) {
 680         return GSS_S_NO_CRED;
 681     }
 682
 683     if (ctx == GSS_C_NO_CONTEXT) {
 684         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 685             return GSS_S_DEFECTIVE_TOKEN;
 686         }
 687
 688         major = gssEapAllocContext(minor, &ctx);
 689         if (GSS_ERROR(major))
 690             return major;
 691
 692         ctx->flags |= CTX_FLAG_INITIATOR;
 693
 694         if (canReauthP(cred))
 695             ctx->state = EAP_STATE_KRB_REAUTH_GSS;
 696
 697         *context_handle = ctx;
 698     }
 699
 700     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 701
 702     sm = &eapGssInitiatorSm[ctx->state];
 703
 704     if (input_token != GSS_C_NO_BUFFER) {
 705         major = gssEapVerifyToken(minor, ctx, input_token,
 706                                   &tokType, &innerInputToken);
 707         if (GSS_ERROR(major))
 708             goto cleanup;
 709
 710         if (tokType != sm->inputTokenType) {
 711             major = GSS_S_DEFECTIVE_TOKEN;
 712             goto cleanup;
 713         }
 714     } else {
 715         innerInputToken.length = 0;
 716         innerInputToken.value = NULL;
 717     }
 718
 719     /*
 720      * Advance through state machine whilst empty tokens are emitted and
 721      * the status is not GSS_S_COMPLETE or an error status.
 722      */
 723     do {
 724         sm = &eapGssInitiatorSm[ctx->state];
 725
 726         major = (sm->processToken)(minor,
 727                                    cred,
 728                                    ctx,
 729                                    target_name,
 730                                    mech_type,
 731                                    req_flags,
 732                                    time_req,
 733                                    input_chan_bindings,
 734                                    &innerInputToken,
 735                                    &innerOutputToken);
 736         if (GSS_ERROR(major))
 737             goto cleanup;
 738     } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.value == NULL);
 739
 740     if (actual_mech_type != NULL) {
 741         if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
 742             duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
 743     }
 744     if (innerOutputToken.value != NULL) {
 745         tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
 746                                    sm->outputTokenType, output_token);
 747         if (GSS_ERROR(tmpMajor)) {
 748             major = tmpMajor;
 749             *minor = tmpMinor;
 750             goto cleanup;
 751         }
 752     }
 753     if (ret_flags != NULL)
 754         *ret_flags = ctx->gssFlags;
 755     if (time_rec != NULL)
 756         gssEapContextTime(&tmpMinor, ctx, time_rec);
 757
 758     assert(ctx->state == EAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
 759
 760 cleanup:
 761     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 762
 763     if (GSS_ERROR(major))
 764         gssEapReleaseContext(&tmpMinor, context_handle);
 765
 766     gss_release_buffer(&tmpMinor, &innerOutputToken);
 767
 768     return major;
 769 }