www.project-moonshot.org Git - mech_eap.orig/blob - init_sec_context.c

   1 /*
   2  * Copyright (c) 2011, 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 /*
  34  * Establish a security context on the initiator (client). These functions
  35  * wrap around libeap.
  36  */
  37
  38 #include "gssapiP_eap.h"
  39
  40 static OM_uint32
  41 policyVariableToFlag(enum eapol_bool_var variable)
  42 {
  43     OM_uint32 flag = 0;
  44
  45     switch (variable) {
  46     case EAPOL_eapSuccess:
  47         flag = CTX_FLAG_EAP_SUCCESS;
  48         break;
  49     case EAPOL_eapRestart:
  50         flag = CTX_FLAG_EAP_RESTART;
  51         break;
  52     case EAPOL_eapFail:
  53         flag = CTX_FLAG_EAP_FAIL;
  54         break;
  55     case EAPOL_eapResp:
  56         flag = CTX_FLAG_EAP_RESP;
  57         break;
  58     case EAPOL_eapNoResp:
  59         flag = CTX_FLAG_EAP_NO_RESP;
  60         break;
  61     case EAPOL_eapReq:
  62         flag = CTX_FLAG_EAP_REQ;
  63         break;
  64     case EAPOL_portEnabled:
  65         flag = CTX_FLAG_EAP_PORT_ENABLED;
  66         break;
  67     case EAPOL_altAccept:
  68         flag = CTX_FLAG_EAP_ALT_ACCEPT;
  69         break;
  70     case EAPOL_altReject:
  71         flag = CTX_FLAG_EAP_ALT_REJECT;
  72         break;
  73     }
  74
  75     return flag;
  76 }
  77
  78 static struct eap_peer_config *
  79 peerGetConfig(void *ctx)
  80 {
  81     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
  82
  83     return &gssCtx->initiatorCtx.eapPeerConfig;
  84 }
  85
  86 static Boolean
  87 peerGetBool(void *data, enum eapol_bool_var variable)
  88 {
  89     gss_ctx_id_t ctx = data;
  90     OM_uint32 flag;
  91
  92     if (ctx == GSS_C_NO_CONTEXT)
  93         return FALSE;
  94
  95     flag = policyVariableToFlag(variable);
  96
  97     return ((ctx->flags & flag) != 0);
  98 }
  99
 100 static void
 101 peerSetBool(void *data, enum eapol_bool_var variable,
 102             Boolean value)
 103 {
 104     gss_ctx_id_t ctx = data;
 105     OM_uint32 flag;
 106
 107     if (ctx == GSS_C_NO_CONTEXT)
 108         return;
 109
 110     flag = policyVariableToFlag(variable);
 111
 112     if (value)
 113         ctx->flags |= flag;
 114     else
 115         ctx->flags &= ~(flag);
 116 }
 117
 118 static unsigned int
 119 peerGetInt(void *data, enum eapol_int_var variable)
 120 {
 121     gss_ctx_id_t ctx = data;
 122
 123     if (ctx == GSS_C_NO_CONTEXT)
 124         return FALSE;
 125
 126     assert(CTX_IS_INITIATOR(ctx));
 127
 128     switch (variable) {
 129     case EAPOL_idleWhile:
 130         return ctx->initiatorCtx.idleWhile;
 131         break;
 132     }
 133
 134     return 0;
 135 }
 136
 137 static void
 138 peerSetInt(void *data, enum eapol_int_var variable,
 139            unsigned int value)
 140 {
 141     gss_ctx_id_t ctx = data;
 142
 143     if (ctx == GSS_C_NO_CONTEXT)
 144         return;
 145
 146     assert(CTX_IS_INITIATOR(ctx));
 147
 148     switch (variable) {
 149     case EAPOL_idleWhile:
 150         ctx->initiatorCtx.idleWhile = value;
 151         break;
 152     }
 153 }
 154
 155 static struct wpabuf *
 156 peerGetEapReqData(void *ctx)
 157 {
 158     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
 159
 160     return &gssCtx->initiatorCtx.reqData;
 161 }
 162
 163 static void
 164 peerSetConfigBlob(void *ctx, struct wpa_config_blob *blob)
 165 {
 166 }
 167
 168 static const struct wpa_config_blob *
 169 peerGetConfigBlob(void *ctx, const char *name)
 170 {
 171     return NULL;
 172 }
 173
 174 static void
 175 peerNotifyPending(void *ctx)
 176 {
 177 }
 178
 179 static struct eapol_callbacks gssEapPolicyCallbacks = {
 180     peerGetConfig,
 181     peerGetBool,
 182     peerSetBool,
 183     peerGetInt,
 184     peerSetInt,
 185     peerGetEapReqData,
 186     peerSetConfigBlob,
 187     peerGetConfigBlob,
 188     peerNotifyPending,
 189 };
 190
 191 #ifdef GSSEAP_DEBUG
 192 extern int wpa_debug_level;
 193 #endif
 194
 195 static OM_uint32
 196 peerConfigInit(OM_uint32 *minor,
 197                gss_cred_id_t cred,
 198                gss_ctx_id_t ctx)
 199 {
 200     krb5_context krbContext;
 201     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 202     krb5_error_code code;
 203     char *identity, *anonymousIdentity;
 204
 205     eapPeerConfig->identity = NULL;
 206     eapPeerConfig->identity_len = 0;
 207     eapPeerConfig->password = NULL;
 208     eapPeerConfig->password_len = 0;
 209
 210     assert(cred != GSS_C_NO_CREDENTIAL);
 211
 212     GSSEAP_KRB_INIT(&krbContext);
 213
 214     eapPeerConfig->fragment_size = 1024;
 215 #ifdef GSSEAP_DEBUG
 216     wpa_debug_level = 0;
 217 #endif
 218
 219     assert(cred->name != GSS_C_NO_NAME);
 220
 221     if ((cred->name->flags & (NAME_FLAG_NAI | NAME_FLAG_SERVICE)) == 0) {
 222         *minor = GSSEAP_BAD_INITIATOR_NAME;
 223         return GSS_S_BAD_NAME;
 224     }
 225
 226     code = krb5_unparse_name(krbContext, cred->name->krbPrincipal, &identity);
 227     if (code != 0) {
 228         *minor = code;
 229         return GSS_S_FAILURE;
 230     }
 231
 232     anonymousIdentity = strchr(identity, '@');
 233     if (anonymousIdentity == NULL)
 234         anonymousIdentity = "";
 235
 236     eapPeerConfig->identity = (unsigned char *)identity;
 237     eapPeerConfig->identity_len = strlen(identity);
 238     eapPeerConfig->anonymous_identity = (unsigned char *)anonymousIdentity;
 239     eapPeerConfig->anonymous_identity_len = strlen(anonymousIdentity);
 240     eapPeerConfig->password = (unsigned char *)cred->password.value;
 241     eapPeerConfig->password_len = cred->password.length;
 242
 243     *minor = 0;
 244     return GSS_S_COMPLETE;
 245 }
 246
 247 static OM_uint32
 248 peerConfigFree(OM_uint32 *minor,
 249                gss_ctx_id_t ctx)
 250 {
 251     krb5_context krbContext;
 252     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 253
 254     GSSEAP_KRB_INIT(&krbContext);
 255
 256     krb5_free_unparsed_name(krbContext, (char *)eapPeerConfig->identity);
 257
 258     *minor = 0;
 259     return GSS_S_COMPLETE;
 260 }
 261
 262 /*
 263  * Mark an initiator context as ready for cryptographic operations
 264  */
 265 static OM_uint32
 266 initReady(OM_uint32 *minor, gss_ctx_id_t ctx, OM_uint32 reqFlags)
 267 {
 268     OM_uint32 major;
 269     const unsigned char *key;
 270     size_t keyLength;
 271
 272 #if 1
 273     /* XXX actually check for mutual auth */
 274     if (reqFlags & GSS_C_MUTUAL_FLAG)
 275         ctx->gssFlags |= GSS_C_MUTUAL_FLAG;
 276 #endif
 277
 278     /* Cache encryption type derived from selected mechanism OID */
 279     major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &ctx->encryptionType);
 280     if (GSS_ERROR(major))
 281         return major;
 282
 283     if (!eap_key_available(ctx->initiatorCtx.eap)) {
 284         *minor = GSSEAP_KEY_UNAVAILABLE;
 285         return GSS_S_UNAVAILABLE;
 286     }
 287
 288     key = eap_get_eapKeyData(ctx->initiatorCtx.eap, &keyLength);
 289
 290     if (keyLength < EAP_EMSK_LEN) {
 291         *minor = GSSEAP_KEY_TOO_SHORT;
 292         return GSS_S_UNAVAILABLE;
 293     }
 294
 295     major = gssEapDeriveRfc3961Key(minor,
 296                                    &key[EAP_EMSK_LEN / 2],
 297                                    EAP_EMSK_LEN / 2,
 298                                    ctx->encryptionType,
 299                                    &ctx->rfc3961Key);
 300        if (GSS_ERROR(major))
 301            return major;
 302
 303     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 304                                       &ctx->checksumType);
 305     if (GSS_ERROR(major))
 306         return major;
 307
 308     major = sequenceInit(minor,
 309                          &ctx->seqState,
 310                          ctx->recvSeq,
 311                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 312                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 313                          TRUE);
 314     if (GSS_ERROR(major))
 315         return major;
 316
 317     *minor = 0;
 318     return GSS_S_COMPLETE;
 319 }
 320
 321 static OM_uint32
 322 initBegin(OM_uint32 *minor,
 323           gss_cred_id_t cred,
 324           gss_ctx_id_t ctx,
 325           gss_name_t target,
 326           gss_OID mech,
 327           OM_uint32 reqFlags,
 328           OM_uint32 timeReq,
 329           gss_channel_bindings_t chanBindings,
 330           gss_buffer_t inputToken)
 331 {
 332     OM_uint32 major;
 333
 334     assert(cred != GSS_C_NO_CREDENTIAL);
 335
 336     if (cred->expiryTime)
 337         ctx->expiryTime = cred->expiryTime;
 338     else if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
 339         ctx->expiryTime = 0;
 340     else
 341         ctx->expiryTime = time(NULL) + timeReq;
 342
 343     /*
 344      * The credential mutex protects its name, however we need to
 345      * explicitly lock the acceptor name (unlikely as it may be
 346      * that it has attributes set on it).
 347      */
 348     major = gssEapDuplicateName(minor, cred->name, &ctx->initiatorName);
 349     if (GSS_ERROR(major))
 350         return major;
 351
 352     GSSEAP_MUTEX_LOCK(&target->mutex);
 353
 354     major = gssEapDuplicateName(minor, target, &ctx->acceptorName);
 355     if (GSS_ERROR(major)) {
 356         GSSEAP_MUTEX_UNLOCK(&target->mutex);
 357         return major;
 358     }
 359
 360     GSSEAP_MUTEX_UNLOCK(&target->mutex);
 361
 362     if (mech == GSS_C_NULL_OID) {
 363         major = gssEapDefaultMech(minor, &ctx->mechanismUsed);
 364     } else if (gssEapIsConcreteMechanismOid(mech)) {
 365         if (!gssEapInternalizeOid(mech, &ctx->mechanismUsed))
 366             major = duplicateOid(minor, mech, &ctx->mechanismUsed);
 367     } else {
 368         major = GSS_S_BAD_MECH;
 369         *minor = GSSEAP_WRONG_MECH;
 370     }
 371     if (GSS_ERROR(major))
 372         return major;
 373
 374     /* If credentials were provided, check they're usable with this mech */
 375     if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
 376         *minor = GSSEAP_CRED_MECH_MISMATCH;
 377         return GSS_S_BAD_MECH;
 378     }
 379
 380     *minor = 0;
 381     return GSS_S_COMPLETE;
 382 }
 383
 384 static OM_uint32
 385 eapGssSmInitError(OM_uint32 *minor,
 386                   gss_cred_id_t cred,
 387                   gss_ctx_id_t ctx,
 388                   gss_name_t target,
 389                   gss_OID mech,
 390                   OM_uint32 reqFlags,
 391                   OM_uint32 timeReq,
 392                   gss_channel_bindings_t chanBindings,
 393                   gss_buffer_t inputToken,
 394                   gss_buffer_t outputToken)
 395 {
 396     OM_uint32 major;
 397     unsigned char *p;
 398
 399     if (inputToken->length < 8) {
 400         *minor = GSSEAP_TOK_TRUNC;
 401         return GSS_S_DEFECTIVE_TOKEN;
 402     }
 403
 404     p = (unsigned char *)inputToken->value;
 405
 406     major = load_uint32_be(&p[0]);
 407     *minor = ERROR_TABLE_BASE_eapg + load_uint32_be(&p[4]);
 408
 409     if (!GSS_ERROR(major) || !IS_WIRE_ERROR(*minor)) {
 410         major = GSS_S_FAILURE;
 411         *minor = GSSEAP_BAD_ERROR_TOKEN;
 412     }
 413
 414     assert(GSS_ERROR(major));
 415
 416     return major;
 417 }
 418
 419 #ifdef GSSEAP_ENABLE_REAUTH
 420 static OM_uint32
 421 eapGssSmInitGssReauth(OM_uint32 *minor,
 422                       gss_cred_id_t cred,
 423                       gss_ctx_id_t ctx,
 424                       gss_name_t target,
 425                       gss_OID mech,
 426                       OM_uint32 reqFlags,
 427                       OM_uint32 timeReq,
 428                       gss_channel_bindings_t chanBindings,
 429                       gss_buffer_t inputToken,
 430                       gss_buffer_t outputToken)
 431 {
 432     OM_uint32 major, tmpMinor;
 433     gss_name_t mechTarget = GSS_C_NO_NAME;
 434     gss_OID actualMech = GSS_C_NO_OID;
 435     OM_uint32 gssFlags, timeRec;
 436
 437     assert(cred != GSS_C_NO_CREDENTIAL);
 438
 439     if (ctx->state == GSSEAP_STATE_INITIAL) {
 440         if (!gssEapCanReauthP(cred, target, timeReq))
 441             return GSS_S_CONTINUE_NEEDED;
 442
 443         major = initBegin(minor, cred, ctx, target, mech,
 444                           reqFlags, timeReq, chanBindings,
 445                           inputToken);
 446         if (GSS_ERROR(major))
 447             goto cleanup;
 448
 449         ctx->flags |= CTX_FLAG_KRB_REAUTH;
 450     } else if ((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0) {
 451         major = GSS_S_DEFECTIVE_TOKEN;
 452         *minor = GSSEAP_WRONG_ITOK;
 453         goto cleanup;
 454     }
 455
 456     major = gssEapMechToGlueName(minor, target, &mechTarget);
 457     if (GSS_ERROR(major))
 458         goto cleanup;
 459
 460     major = gssInitSecContext(minor,
 461                               cred->krbCred,
 462                               &ctx->kerberosCtx,
 463                               mechTarget,
 464                               (gss_OID)gss_mech_krb5,
 465                               reqFlags,
 466                               timeReq,
 467                               chanBindings,
 468                               inputToken,
 469                               &actualMech,
 470                               outputToken,
 471                               &gssFlags,
 472                               &timeRec);
 473     if (GSS_ERROR(major))
 474         goto cleanup;
 475
 476     ctx->gssFlags = gssFlags;
 477
 478     if (major == GSS_S_COMPLETE) {
 479         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 480         if (GSS_ERROR(major))
 481             goto cleanup;
 482         ctx->state = GSSEAP_STATE_NEGO_EXT; /* skip */
 483     } else {
 484         major = GSS_S_COMPLETE; /* advance state */
 485     }
 486
 487 cleanup:
 488     gssReleaseName(&tmpMinor, &mechTarget);
 489
 490     return major;
 491 }
 492 #endif /* GSSEAP_ENABLE_REAUTH */
 493
 494 static OM_uint32
 495 eapGssSmInitIdentity(OM_uint32 *minor,
 496                      gss_cred_id_t cred,
 497                      gss_ctx_id_t ctx,
 498                      gss_name_t target,
 499                      gss_OID mech,
 500                      OM_uint32 reqFlags,
 501                      OM_uint32 timeReq,
 502                      gss_channel_bindings_t chanBindings,
 503                      gss_buffer_t inputToken,
 504                      gss_buffer_t outputToken)
 505 {
 506     OM_uint32 major;
 507     int initialContextToken;
 508
 509     assert((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0);
 510
 511     initialContextToken = (inputToken->length == 0);
 512     if (!initialContextToken) {
 513         *minor = GSSEAP_WRONG_SIZE;
 514         return GSS_S_DEFECTIVE_TOKEN;
 515     }
 516
 517     major = initBegin(minor, cred, ctx, target, mech,
 518                       reqFlags, timeReq, chanBindings,
 519                       inputToken);
 520     if (GSS_ERROR(major))
 521         return major;
 522
 523     outputToken->length = 0;
 524     outputToken->value = NULL;
 525
 526     *minor = 0;
 527     return GSS_S_COMPLETE; /* advance state */
 528 }
 529
 530 static struct wpabuf emptyWpaBuffer;
 531
 532 static OM_uint32
 533 eapGssSmInitAuthenticate(OM_uint32 *minor,
 534                          gss_cred_id_t cred,
 535                          gss_ctx_id_t ctx,
 536                          gss_name_t target,
 537                          gss_OID mech,
 538                          OM_uint32 reqFlags,
 539                          OM_uint32 timeReq,
 540                          gss_channel_bindings_t chanBindings,
 541                          gss_buffer_t inputToken,
 542                          gss_buffer_t outputToken)
 543 {
 544     OM_uint32 major;
 545     OM_uint32 tmpMinor;
 546     int code;
 547     struct wpabuf *resp = NULL;
 548     int initialContextToken;
 549
 550     *minor = 0;
 551
 552     initialContextToken = (inputToken == GSS_C_NO_BUFFER ||
 553                            inputToken->length == 0);
 554
 555     major = peerConfigInit(minor, cred, ctx);
 556     if (GSS_ERROR(major))
 557         goto cleanup;
 558
 559     if (ctx->initiatorCtx.eap == NULL) {
 560         struct eap_config eapConfig;
 561
 562         memset(&eapConfig, 0, sizeof(eapConfig));
 563
 564         ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 565                                                  &gssEapPolicyCallbacks,
 566                                                  ctx,
 567                                                  &eapConfig);
 568         if (ctx->initiatorCtx.eap == NULL) {
 569             major = GSS_S_FAILURE;
 570             *minor = GSSEAP_PEER_SM_INIT_FAILURE;
 571             goto cleanup;
 572         }
 573
 574         ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 575     }
 576
 577     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 578
 579     wpabuf_set(&ctx->initiatorCtx.reqData,
 580                inputToken->value, inputToken->length);
 581
 582     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 583     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 584         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 585
 586         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 587         major = GSS_S_CONTINUE_NEEDED;
 588     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 589         major = initReady(minor, ctx, reqFlags);
 590         if (GSS_ERROR(major))
 591             goto cleanup;
 592
 593         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 594         major = GSS_S_COMPLETE; /* advance state */
 595     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 596         major = GSS_S_DEFECTIVE_CREDENTIAL;
 597         *minor = GSSEAP_PEER_AUTH_FAILURE;
 598     } else if (code == 0 && initialContextToken) {
 599         major = GSS_S_CONTINUE_NEEDED;
 600     } else {
 601         major = GSS_S_DEFECTIVE_TOKEN;
 602         *minor = GSSEAP_PEER_BAD_MESSAGE;
 603     }
 604
 605 cleanup:
 606     if (resp != NULL) {
 607         OM_uint32 tmpMajor;
 608         gss_buffer_desc respBuf;
 609
 610         assert(!GSS_ERROR(major));
 611
 612         respBuf.length = wpabuf_len(resp);
 613         respBuf.value = (void *)wpabuf_head(resp);
 614
 615         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 616         if (GSS_ERROR(tmpMajor)) {
 617             major = tmpMajor;
 618             *minor = tmpMinor;
 619         }
 620     }
 621
 622     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 623     peerConfigFree(&tmpMinor, ctx);
 624
 625     return major;
 626 }
 627
 628 static OM_uint32
 629 eapGssSmInitGssChannelBindings(OM_uint32 *minor,
 630                                gss_cred_id_t cred,
 631                                gss_ctx_id_t ctx,
 632                                gss_name_t target,
 633                                gss_OID mech,
 634                                OM_uint32 reqFlags,
 635                                OM_uint32 timeReq,
 636                                gss_channel_bindings_t chanBindings,
 637                                gss_buffer_t inputToken,
 638                                gss_buffer_t outputToken)
 639 {
 640     OM_uint32 major;
 641     gss_buffer_desc buffer = GSS_C_EMPTY_BUFFER;
 642
 643     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
 644         buffer = chanBindings->application_data;
 645
 646     major = gssEapWrap(minor, ctx, TRUE, GSS_C_QOP_DEFAULT,
 647                        &buffer, NULL, outputToken);
 648     if (GSS_ERROR(major))
 649         return major;
 650
 651     assert(outputToken->value != NULL);
 652
 653     *minor = 0;
 654     return GSS_S_CONTINUE_NEEDED;
 655 }
 656
 657 #ifdef GSSEAP_ENABLE_REAUTH
 658 static OM_uint32
 659 eapGssSmInitReauthCreds(OM_uint32 *minor,
 660                         gss_cred_id_t cred,
 661                         gss_ctx_id_t ctx,
 662                         gss_name_t target,
 663                         gss_OID mech,
 664                         OM_uint32 reqFlags,
 665                         OM_uint32 timeReq,
 666                         gss_channel_bindings_t chanBindings,
 667                         gss_buffer_t inputToken,
 668                         gss_buffer_t outputToken)
 669 {
 670     OM_uint32 major;
 671
 672     major = gssEapStoreReauthCreds(minor, ctx, cred, inputToken);
 673     if (GSS_ERROR(major))
 674         return major;
 675
 676     *minor = 0;
 677     return GSS_S_CONTINUE_NEEDED;
 678 }
 679 #endif /* GSSEAP_ENABLE_REAUTH */
 680
 681 static OM_uint32
 682 eapGssSmInitNegoExtFinished(OM_uint32 *minor,
 683                             gss_cred_id_t cred,
 684                             gss_ctx_id_t ctx,
 685                             gss_name_t target,
 686                             gss_OID mech,
 687                             OM_uint32 reqFlags,
 688                             OM_uint32 timeReq,
 689                             gss_channel_bindings_t chanBindings,
 690                             gss_buffer_t inputToken,
 691                             gss_buffer_t outputToken)
 692 {
 693     *minor = 0;
 694     return GSS_S_COMPLETE; /* advance state */
 695 }
 696
 697 static struct gss_eap_sm eapGssInitiatorSm[] = {
 698     {
 699         ITOK_TYPE_CONTEXT_ERR,
 700         ITOK_TYPE_NONE,
 701         GSSEAP_STATE_ALL,
 702         1, /* critical */
 703         0, /* required */
 704         eapGssSmInitError,
 705     },
 706 #ifdef GSSEAP_ENABLE_REAUTH
 707     {
 708         ITOK_TYPE_REAUTH_RESP,
 709         ITOK_TYPE_REAUTH_REQ,
 710         GSSEAP_STATE_INITIAL | GSSEAP_STATE_AUTHENTICATE,
 711         0, /* critical */
 712         0, /* required */
 713         eapGssSmInitGssReauth,
 714     },
 715 #endif
 716     /* first-leg extensions go here, they should return GSS_S_CONTINUE_NEEDED */
 717     {
 718         ITOK_TYPE_NONE,
 719         ITOK_TYPE_NONE,
 720         GSSEAP_STATE_INITIAL,
 721         1, /* critical */
 722         1, /* required */
 723         eapGssSmInitIdentity,
 724     },
 725     {
 726         ITOK_TYPE_EAP_REQ,
 727         ITOK_TYPE_EAP_RESP,
 728         GSSEAP_STATE_AUTHENTICATE,
 729         1, /* critical */
 730         1, /* required */
 731         eapGssSmInitAuthenticate,
 732     },
 733     {
 734         ITOK_TYPE_NONE,
 735         ITOK_TYPE_GSS_CHANNEL_BINDINGS,
 736         GSSEAP_STATE_NEGO_EXT,
 737         1, /* critical */
 738         1, /* required */
 739         eapGssSmInitGssChannelBindings,
 740     },
 741 #ifdef GSSEAP_ENABLE_REAUTH
 742     {
 743         ITOK_TYPE_REAUTH_CREDS,
 744         ITOK_TYPE_NONE,
 745         GSSEAP_STATE_NEGO_EXT,
 746         0, /* critical */
 747         0, /* required */
 748         eapGssSmInitReauthCreds,
 749     },
 750 #endif
 751     /* other extensions go here */
 752     {
 753         ITOK_TYPE_NONE,
 754         ITOK_TYPE_NONE,
 755         GSSEAP_STATE_NEGO_EXT,
 756         1, /* critical */
 757         1, /* required */
 758         eapGssSmInitNegoExtFinished
 759     }
 760 };
 761
 762 OM_uint32
 763 gss_init_sec_context(OM_uint32 *minor,
 764                      gss_cred_id_t cred,
 765                      gss_ctx_id_t *context_handle,
 766                      gss_name_t target_name,
 767                      gss_OID mech_type,
 768                      OM_uint32 req_flags,
 769                      OM_uint32 time_req,
 770                      gss_channel_bindings_t input_chan_bindings,
 771                      gss_buffer_t input_token,
 772                      gss_OID *actual_mech_type,
 773                      gss_buffer_t output_token,
 774                      OM_uint32 *ret_flags,
 775                      OM_uint32 *time_rec)
 776 {
 777     OM_uint32 major, tmpMinor;
 778     gss_ctx_id_t ctx = *context_handle;
 779     int initialContextToken = 0;
 780
 781     *minor = 0;
 782
 783     output_token->length = 0;
 784     output_token->value = NULL;
 785
 786     if (ctx == GSS_C_NO_CONTEXT) {
 787         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 788             *minor = GSSEAP_WRONG_SIZE;
 789             return GSS_S_DEFECTIVE_TOKEN;
 790         }
 791
 792         major = gssEapAllocContext(minor, &ctx);
 793         if (GSS_ERROR(major))
 794             return major;
 795
 796         ctx->flags |= CTX_FLAG_INITIATOR;
 797
 798         initialContextToken = 1;
 799         *context_handle = ctx;
 800     }
 801
 802     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 803
 804     if (cred == GSS_C_NO_CREDENTIAL) {
 805         if (ctx->defaultCred == GSS_C_NO_CREDENTIAL) {
 806             major = gssEapAcquireCred(minor,
 807                                       GSS_C_NO_NAME,
 808                                       GSS_C_NO_BUFFER,
 809                                       time_req,
 810                                       GSS_C_NO_OID_SET,
 811                                       GSS_C_INITIATE,
 812                                       &ctx->defaultCred,
 813                                       NULL,
 814                                       NULL);
 815             if (GSS_ERROR(major))
 816                 goto cleanup;
 817         }
 818
 819         cred = ctx->defaultCred;
 820     }
 821
 822     GSSEAP_MUTEX_LOCK(&cred->mutex);
 823
 824
 825     if ((cred->flags & CRED_FLAG_INITIATE) == 0) {
 826         major = GSS_S_NO_CRED;
 827         *minor = GSSEAP_CRED_USAGE_MISMATCH;
 828         goto cleanup;
 829     }
 830
 831     major = gssEapSmStep(minor,
 832                          cred,
 833                          ctx,
 834                          target_name,
 835                          mech_type,
 836                          req_flags,
 837                          time_req,
 838                          input_chan_bindings,
 839                          input_token,
 840                          output_token,
 841                          eapGssInitiatorSm,
 842                          sizeof(eapGssInitiatorSm) / sizeof(eapGssInitiatorSm[0]));
 843     if (GSS_ERROR(major))
 844         goto cleanup;
 845
 846     if (actual_mech_type != NULL) {
 847         if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
 848             duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
 849     }
 850     if (ret_flags != NULL)
 851         *ret_flags = ctx->gssFlags;
 852     if (time_rec != NULL)
 853         gssEapContextTime(&tmpMinor, ctx, time_rec);
 854
 855     assert(ctx->state == GSSEAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
 856
 857 cleanup:
 858     if (cred != GSS_C_NO_CREDENTIAL)
 859         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
 860     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 861
 862     if (GSS_ERROR(major))
 863         gssEapReleaseContext(&tmpMinor, context_handle);
 864
 865     return major;
 866 }