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                   OM_uint32 *smFlags)
 396 {
 397     OM_uint32 major;
 398     unsigned char *p;
 399
 400     if (inputToken->length < 8) {
 401         *minor = GSSEAP_TOK_TRUNC;
 402         return GSS_S_DEFECTIVE_TOKEN;
 403     }
 404
 405     p = (unsigned char *)inputToken->value;
 406
 407     major = load_uint32_be(&p[0]);
 408     *minor = ERROR_TABLE_BASE_eapg + load_uint32_be(&p[4]);
 409
 410     if (!GSS_ERROR(major) || !IS_WIRE_ERROR(*minor)) {
 411         major = GSS_S_FAILURE;
 412         *minor = GSSEAP_BAD_ERROR_TOKEN;
 413     }
 414
 415     assert(GSS_ERROR(major));
 416
 417     return major;
 418 }
 419
 420 #ifdef GSSEAP_ENABLE_REAUTH
 421 static OM_uint32
 422 eapGssSmInitGssReauth(OM_uint32 *minor,
 423                       gss_cred_id_t cred,
 424                       gss_ctx_id_t ctx,
 425                       gss_name_t target,
 426                       gss_OID mech,
 427                       OM_uint32 reqFlags,
 428                       OM_uint32 timeReq,
 429                       gss_channel_bindings_t chanBindings,
 430                       gss_buffer_t inputToken,
 431                       gss_buffer_t outputToken,
 432                       OM_uint32 *smFlags)
 433 {
 434     OM_uint32 major, tmpMinor;
 435     gss_name_t mechTarget = GSS_C_NO_NAME;
 436     gss_OID actualMech = GSS_C_NO_OID;
 437     OM_uint32 gssFlags, timeRec;
 438
 439     assert(cred != GSS_C_NO_CREDENTIAL);
 440
 441     if (ctx->state == GSSEAP_STATE_INITIAL) {
 442         if (!gssEapCanReauthP(cred, target, timeReq))
 443             return GSS_S_CONTINUE_NEEDED;
 444
 445         major = initBegin(minor, cred, ctx, target, mech,
 446                           reqFlags, timeReq, chanBindings,
 447                           inputToken);
 448         if (GSS_ERROR(major))
 449             goto cleanup;
 450
 451         ctx->flags |= CTX_FLAG_KRB_REAUTH;
 452     } else if ((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0) {
 453         major = GSS_S_DEFECTIVE_TOKEN;
 454         *minor = GSSEAP_WRONG_ITOK;
 455         goto cleanup;
 456     }
 457
 458     major = gssEapMechToGlueName(minor, target, &mechTarget);
 459     if (GSS_ERROR(major))
 460         goto cleanup;
 461
 462     major = gssInitSecContext(minor,
 463                               cred->krbCred,
 464                               &ctx->kerberosCtx,
 465                               mechTarget,
 466                               (gss_OID)gss_mech_krb5,
 467                               reqFlags,
 468                               timeReq,
 469                               chanBindings,
 470                               inputToken,
 471                               &actualMech,
 472                               outputToken,
 473                               &gssFlags,
 474                               &timeRec);
 475     if (GSS_ERROR(major))
 476         goto cleanup;
 477
 478     ctx->gssFlags = gssFlags;
 479
 480     *smFlags |= SM_FLAG_STOP_EVAL;
 481
 482     if (major == GSS_S_COMPLETE) {
 483         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 484         if (GSS_ERROR(major))
 485             goto cleanup;
 486         ctx->state = GSSEAP_STATE_ESTABLISHED;
 487     } else {
 488         ctx->state = GSSEAP_STATE_REAUTHENTICATE;
 489     }
 490
 491 cleanup:
 492     gssReleaseName(&tmpMinor, &mechTarget);
 493
 494     return major;
 495 }
 496 #endif /* GSSEAP_ENABLE_REAUTH */
 497
 498 #ifdef GSSEAP_DEBUG
 499 static OM_uint32
 500 eapGssSmInitVendorInfo(OM_uint32 *minor,
 501                        gss_cred_id_t cred,
 502                        gss_ctx_id_t ctx,
 503                        gss_name_t target,
 504                        gss_OID mech,
 505                        OM_uint32 reqFlags,
 506                        OM_uint32 timeReq,
 507                        gss_channel_bindings_t chanBindings,
 508                        gss_buffer_t inputToken,
 509                        gss_buffer_t outputToken,
 510                        OM_uint32 *smFlags)
 511 {
 512     OM_uint32 major;
 513
 514     major = makeStringBuffer(minor, "JANET(UK)", outputToken);
 515     if (GSS_ERROR(major))
 516         return major;
 517
 518     return GSS_S_CONTINUE_NEEDED;
 519 }
 520 #endif
 521
 522 static OM_uint32
 523 eapGssSmInitIdentity(OM_uint32 *minor,
 524                      gss_cred_id_t cred,
 525                      gss_ctx_id_t ctx,
 526                      gss_name_t target,
 527                      gss_OID mech,
 528                      OM_uint32 reqFlags,
 529                      OM_uint32 timeReq,
 530                      gss_channel_bindings_t chanBindings,
 531                      gss_buffer_t inputToken,
 532                      gss_buffer_t outputToken,
 533                      OM_uint32 *smFlags)
 534 {
 535     OM_uint32 major;
 536     struct eap_config eapConfig;
 537
 538     assert((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0);
 539     assert(inputToken == GSS_C_NO_BUFFER);
 540
 541     major = initBegin(minor, cred, ctx, target, mech,
 542                       reqFlags, timeReq, chanBindings,
 543                       inputToken);
 544     if (GSS_ERROR(major))
 545         return major;
 546
 547     memset(&eapConfig, 0, sizeof(eapConfig));
 548
 549     ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 550                                              &gssEapPolicyCallbacks,
 551                                              ctx,
 552                                              &eapConfig);
 553     if (ctx->initiatorCtx.eap == NULL) {
 554         *minor = GSSEAP_PEER_SM_INIT_FAILURE;
 555         return GSS_S_FAILURE;
 556     }
 557
 558     ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 559
 560     /* poke EAP state machine */
 561     if (eap_peer_sm_step(ctx->initiatorCtx.eap) != 0) {
 562         *minor = GSSEAP_PEER_SM_STEP_FAILURE;
 563         return GSS_S_FAILURE;
 564     }
 565
 566     /* force sending of empty token */
 567     *minor = 0;
 568     *smFlags |= SM_FLAG_TRANSITION | SM_FLAG_FORCE_SEND_TOKEN;
 569
 570     return GSS_S_CONTINUE_NEEDED;
 571 }
 572
 573 static OM_uint32
 574 eapGssSmInitAuthenticate(OM_uint32 *minor,
 575                          gss_cred_id_t cred,
 576                          gss_ctx_id_t ctx,
 577                          gss_name_t target,
 578                          gss_OID mech,
 579                          OM_uint32 reqFlags,
 580                          OM_uint32 timeReq,
 581                          gss_channel_bindings_t chanBindings,
 582                          gss_buffer_t inputToken,
 583                          gss_buffer_t outputToken,
 584                          OM_uint32 *smFlags)
 585 {
 586     OM_uint32 major;
 587     OM_uint32 tmpMinor;
 588     int code;
 589     struct wpabuf *resp = NULL;
 590
 591     *minor = 0;
 592
 593     assert(inputToken != GSS_C_NO_BUFFER);
 594
 595     major = peerConfigInit(minor, cred, ctx);
 596     if (GSS_ERROR(major))
 597         goto cleanup;
 598
 599     assert(ctx->initiatorCtx.eap != NULL);
 600     assert(ctx->flags & CTX_FLAG_EAP_PORT_ENABLED);
 601
 602     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 603
 604     wpabuf_set(&ctx->initiatorCtx.reqData,
 605                inputToken->value, inputToken->length);
 606
 607     major = GSS_S_CONTINUE_NEEDED;
 608
 609     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 610     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 611         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 612
 613         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 614     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 615         major = initReady(minor, ctx, reqFlags);
 616         if (GSS_ERROR(major))
 617             goto cleanup;
 618
 619         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 620         major = GSS_S_CONTINUE_NEEDED;
 621         *smFlags |= SM_FLAG_TRANSITION;
 622     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 623         major = GSS_S_DEFECTIVE_CREDENTIAL;
 624         *minor = GSSEAP_PEER_AUTH_FAILURE;
 625     } else {
 626         major = GSS_S_DEFECTIVE_TOKEN;
 627         *minor = GSSEAP_PEER_BAD_MESSAGE;
 628     }
 629
 630 cleanup:
 631     if (resp != NULL) {
 632         OM_uint32 tmpMajor;
 633         gss_buffer_desc respBuf;
 634
 635         assert(major == GSS_S_CONTINUE_NEEDED);
 636
 637         respBuf.length = wpabuf_len(resp);
 638         respBuf.value = (void *)wpabuf_head(resp);
 639
 640         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 641         if (GSS_ERROR(tmpMajor)) {
 642             major = tmpMajor;
 643             *minor = tmpMinor;
 644         }
 645     }
 646
 647     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 648     peerConfigFree(&tmpMinor, ctx);
 649
 650     return major;
 651 }
 652
 653 static OM_uint32
 654 eapGssSmInitGssChannelBindings(OM_uint32 *minor,
 655                                gss_cred_id_t cred,
 656                                gss_ctx_id_t ctx,
 657                                gss_name_t target,
 658                                gss_OID mech,
 659                                OM_uint32 reqFlags,
 660                                OM_uint32 timeReq,
 661                                gss_channel_bindings_t chanBindings,
 662                                gss_buffer_t inputToken,
 663                                gss_buffer_t outputToken,
 664                                OM_uint32 *smFlags)
 665 {
 666     OM_uint32 major;
 667     gss_buffer_desc buffer = GSS_C_EMPTY_BUFFER;
 668
 669     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
 670         buffer = chanBindings->application_data;
 671
 672     major = gssEapWrap(minor, ctx, TRUE, GSS_C_QOP_DEFAULT,
 673                        &buffer, NULL, outputToken);
 674     if (GSS_ERROR(major))
 675         return major;
 676
 677     assert(outputToken->value != NULL);
 678
 679     *minor = 0;
 680     return GSS_S_CONTINUE_NEEDED;
 681 }
 682
 683 #ifdef GSSEAP_ENABLE_REAUTH
 684 static OM_uint32
 685 eapGssSmInitReauthCreds(OM_uint32 *minor,
 686                         gss_cred_id_t cred,
 687                         gss_ctx_id_t ctx,
 688                         gss_name_t target,
 689                         gss_OID mech,
 690                         OM_uint32 reqFlags,
 691                         OM_uint32 timeReq,
 692                         gss_channel_bindings_t chanBindings,
 693                         gss_buffer_t inputToken,
 694                         gss_buffer_t outputToken,
 695                         OM_uint32 *smFlags)
 696 {
 697     OM_uint32 major;
 698
 699     major = gssEapStoreReauthCreds(minor, ctx, cred, inputToken);
 700     if (GSS_ERROR(major))
 701         return major;
 702
 703     *minor = 0;
 704     return GSS_S_CONTINUE_NEEDED;
 705 }
 706 #endif /* GSSEAP_ENABLE_REAUTH */
 707
 708 static OM_uint32
 709 eapGssSmInitCompleteInitiatorExts(OM_uint32 *minor,
 710                                   gss_cred_id_t cred,
 711                                   gss_ctx_id_t ctx,
 712                                   gss_name_t target,
 713                                   gss_OID mech,
 714                                   OM_uint32 reqFlags,
 715                                   OM_uint32 timeReq,
 716                                   gss_channel_bindings_t chanBindings,
 717                                   gss_buffer_t inputToken,
 718                                   gss_buffer_t outputToken,
 719                                   OM_uint32 *smFlags)
 720 {
 721     *minor = 0;
 722
 723     *smFlags |= SM_FLAG_TRANSITION | SM_FLAG_STOP_EVAL;
 724
 725     return GSS_S_CONTINUE_NEEDED;
 726 }
 727
 728 static OM_uint32
 729 eapGssSmInitCompleteAcceptorExts(OM_uint32 *minor,
 730                                  gss_cred_id_t cred,
 731                                  gss_ctx_id_t ctx,
 732                                  gss_name_t target,
 733                                  gss_OID mech,
 734                                  OM_uint32 reqFlags,
 735                                  OM_uint32 timeReq,
 736                                  gss_channel_bindings_t chanBindings,
 737                                  gss_buffer_t inputToken,
 738                                  gss_buffer_t outputToken,
 739                                  OM_uint32 *smFlags)
 740 {
 741     *minor = 0;
 742
 743     ctx->state = GSSEAP_STATE_ESTABLISHED;
 744     *smFlags |= SM_FLAG_STOP_EVAL;
 745
 746     return GSS_S_COMPLETE;
 747 }
 748
 749 static struct gss_eap_sm eapGssInitiatorSm[] = {
 750     {
 751         ITOK_TYPE_CONTEXT_ERR,
 752         ITOK_TYPE_NONE,
 753         GSSEAP_STATE_ALL & ~(GSSEAP_STATE_INITIAL),
 754         SM_ITOK_FLAG_CRITICAL,
 755         eapGssSmInitError,
 756     },
 757 #ifdef GSSEAP_DEBUG
 758     {
 759         ITOK_TYPE_NONE,
 760         ITOK_TYPE_VENDOR_INFO,
 761         GSSEAP_STATE_INITIAL,
 762         0,
 763         eapGssSmInitVendorInfo,
 764     },
 765 #endif
 766 #ifdef GSSEAP_ENABLE_REAUTH
 767     {
 768         ITOK_TYPE_REAUTH_RESP,
 769         ITOK_TYPE_REAUTH_REQ,
 770         GSSEAP_STATE_INITIAL | GSSEAP_STATE_REAUTHENTICATE,
 771         0,
 772         eapGssSmInitGssReauth,
 773     },
 774 #endif
 775     {
 776         ITOK_TYPE_NONE,
 777         ITOK_TYPE_NONE,
 778         GSSEAP_STATE_INITIAL,
 779         SM_ITOK_FLAG_CRITICAL | SM_ITOK_FLAG_REQUIRED,
 780         eapGssSmInitIdentity,
 781     },
 782     {
 783         ITOK_TYPE_EAP_REQ,
 784         ITOK_TYPE_EAP_RESP,
 785         GSSEAP_STATE_AUTHENTICATE,
 786         SM_ITOK_FLAG_CRITICAL | SM_ITOK_FLAG_REQUIRED,
 787         eapGssSmInitAuthenticate,
 788     },
 789     {
 790         ITOK_TYPE_NONE,
 791         ITOK_TYPE_GSS_CHANNEL_BINDINGS,
 792         GSSEAP_STATE_INITIATOR_EXTS,
 793         SM_ITOK_FLAG_CRITICAL | SM_ITOK_FLAG_REQUIRED,
 794         eapGssSmInitGssChannelBindings,
 795     },
 796     {
 797         ITOK_TYPE_NONE,
 798         ITOK_TYPE_NONE,
 799         GSSEAP_STATE_INITIATOR_EXTS,
 800         0,
 801         eapGssSmInitCompleteInitiatorExts
 802     },
 803 #ifdef GSSEAP_ENABLE_REAUTH
 804     {
 805         ITOK_TYPE_REAUTH_CREDS,
 806         ITOK_TYPE_NONE,
 807         GSSEAP_STATE_ACCEPTOR_EXTS,
 808         0,
 809         eapGssSmInitReauthCreds,
 810     },
 811 #endif
 812     /* other extensions go here */
 813     {
 814         ITOK_TYPE_NONE,
 815         ITOK_TYPE_NONE,
 816         GSSEAP_STATE_ACCEPTOR_EXTS,
 817         0,
 818         eapGssSmInitCompleteAcceptorExts
 819     }
 820 };
 821
 822 OM_uint32
 823 gss_init_sec_context(OM_uint32 *minor,
 824                      gss_cred_id_t cred,
 825                      gss_ctx_id_t *context_handle,
 826                      gss_name_t target_name,
 827                      gss_OID mech_type,
 828                      OM_uint32 req_flags,
 829                      OM_uint32 time_req,
 830                      gss_channel_bindings_t input_chan_bindings,
 831                      gss_buffer_t input_token,
 832                      gss_OID *actual_mech_type,
 833                      gss_buffer_t output_token,
 834                      OM_uint32 *ret_flags,
 835                      OM_uint32 *time_rec)
 836 {
 837     OM_uint32 major, tmpMinor;
 838     gss_ctx_id_t ctx = *context_handle;
 839
 840     *minor = 0;
 841
 842     output_token->length = 0;
 843     output_token->value = NULL;
 844
 845     if (ctx == GSS_C_NO_CONTEXT) {
 846         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 847             *minor = GSSEAP_WRONG_SIZE;
 848             return GSS_S_DEFECTIVE_TOKEN;
 849         }
 850
 851         major = gssEapAllocContext(minor, &ctx);
 852         if (GSS_ERROR(major))
 853             return major;
 854
 855         ctx->flags |= CTX_FLAG_INITIATOR;
 856
 857         *context_handle = ctx;
 858     }
 859
 860     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 861
 862     if (cred == GSS_C_NO_CREDENTIAL) {
 863         if (ctx->defaultCred == GSS_C_NO_CREDENTIAL) {
 864             major = gssEapAcquireCred(minor,
 865                                       GSS_C_NO_NAME,
 866                                       GSS_C_NO_BUFFER,
 867                                       time_req,
 868                                       GSS_C_NO_OID_SET,
 869                                       GSS_C_INITIATE,
 870                                       &ctx->defaultCred,
 871                                       NULL,
 872                                       NULL);
 873             if (GSS_ERROR(major))
 874                 goto cleanup;
 875         }
 876
 877         cred = ctx->defaultCred;
 878     }
 879
 880     GSSEAP_MUTEX_LOCK(&cred->mutex);
 881
 882
 883     if ((cred->flags & CRED_FLAG_INITIATE) == 0) {
 884         major = GSS_S_NO_CRED;
 885         *minor = GSSEAP_CRED_USAGE_MISMATCH;
 886         goto cleanup;
 887     }
 888
 889     major = gssEapSmStep(minor,
 890                          cred,
 891                          ctx,
 892                          target_name,
 893                          mech_type,
 894                          req_flags,
 895                          time_req,
 896                          input_chan_bindings,
 897                          input_token,
 898                          output_token,
 899                          eapGssInitiatorSm,
 900                          sizeof(eapGssInitiatorSm) / sizeof(eapGssInitiatorSm[0]));
 901     if (GSS_ERROR(major))
 902         goto cleanup;
 903
 904     if (actual_mech_type != NULL) {
 905         if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
 906             duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
 907     }
 908     if (ret_flags != NULL)
 909         *ret_flags = ctx->gssFlags;
 910     if (time_rec != NULL)
 911         gssEapContextTime(&tmpMinor, ctx, time_rec);
 912
 913     assert(ctx->state == GSSEAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
 914
 915 cleanup:
 916     if (cred != GSS_C_NO_CREDENTIAL)
 917         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
 918     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 919
 920     if (GSS_ERROR(major))
 921         gssEapReleaseContext(&tmpMinor, context_handle);
 922
 923     return major;
 924 }