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 {
 331     OM_uint32 major;
 332
 333     assert(cred != GSS_C_NO_CREDENTIAL);
 334
 335     if (cred->expiryTime)
 336         ctx->expiryTime = cred->expiryTime;
 337     else if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
 338         ctx->expiryTime = 0;
 339     else
 340         ctx->expiryTime = time(NULL) + timeReq;
 341
 342     /*
 343      * The credential mutex protects its name, however we need to
 344      * explicitly lock the acceptor name (unlikely as it may be
 345      * that it has attributes set on it).
 346      */
 347     major = gssEapDuplicateName(minor, cred->name, &ctx->initiatorName);
 348     if (GSS_ERROR(major))
 349         return major;
 350
 351     if (target != GSS_C_NO_NAME) {
 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
 363     if (mech == GSS_C_NULL_OID) {
 364         major = gssEapDefaultMech(minor, &ctx->mechanismUsed);
 365     } else if (gssEapIsConcreteMechanismOid(mech)) {
 366         if (!gssEapInternalizeOid(mech, &ctx->mechanismUsed))
 367             major = duplicateOid(minor, mech, &ctx->mechanismUsed);
 368     } else {
 369         major = GSS_S_BAD_MECH;
 370         *minor = GSSEAP_WRONG_MECH;
 371     }
 372     if (GSS_ERROR(major))
 373         return major;
 374
 375     /* If credentials were provided, check they're usable with this mech */
 376     if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
 377         *minor = GSSEAP_CRED_MECH_MISMATCH;
 378         return GSS_S_BAD_MECH;
 379     }
 380
 381     *minor = 0;
 382     return GSS_S_COMPLETE;
 383 }
 384
 385 static OM_uint32
 386 eapGssSmInitError(OM_uint32 *minor,
 387                   gss_cred_id_t cred,
 388                   gss_ctx_id_t ctx,
 389                   gss_name_t target,
 390                   gss_OID mech,
 391                   OM_uint32 reqFlags,
 392                   OM_uint32 timeReq,
 393                   gss_channel_bindings_t chanBindings,
 394                   gss_buffer_t inputToken,
 395                   gss_buffer_t outputToken,
 396                   OM_uint32 *smFlags)
 397 {
 398     OM_uint32 major;
 399     unsigned char *p;
 400
 401     if (inputToken->length < 8) {
 402         *minor = GSSEAP_TOK_TRUNC;
 403         return GSS_S_DEFECTIVE_TOKEN;
 404     }
 405
 406     p = (unsigned char *)inputToken->value;
 407
 408     major = load_uint32_be(&p[0]);
 409     *minor = ERROR_TABLE_BASE_eapg + load_uint32_be(&p[4]);
 410
 411     if (!GSS_ERROR(major) || !IS_WIRE_ERROR(*minor)) {
 412         major = GSS_S_FAILURE;
 413         *minor = GSSEAP_BAD_ERROR_TOKEN;
 414     }
 415
 416     assert(GSS_ERROR(major));
 417
 418     return major;
 419 }
 420
 421 #ifdef GSSEAP_ENABLE_REAUTH
 422 static OM_uint32
 423 eapGssSmInitGssReauth(OM_uint32 *minor,
 424                       gss_cred_id_t cred,
 425                       gss_ctx_id_t ctx,
 426                       gss_name_t target,
 427                       gss_OID mech,
 428                       OM_uint32 reqFlags,
 429                       OM_uint32 timeReq,
 430                       gss_channel_bindings_t chanBindings,
 431                       gss_buffer_t inputToken,
 432                       gss_buffer_t outputToken,
 433                       OM_uint32 *smFlags)
 434 {
 435     OM_uint32 major, tmpMinor;
 436     gss_name_t mechTarget = GSS_C_NO_NAME;
 437     gss_OID actualMech = GSS_C_NO_OID;
 438     OM_uint32 gssFlags, timeRec;
 439
 440     assert(cred != GSS_C_NO_CREDENTIAL);
 441
 442     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL) {
 443         if (!gssEapCanReauthP(cred, target, timeReq))
 444             return GSS_S_CONTINUE_NEEDED;
 445
 446         ctx->flags |= CTX_FLAG_KRB_REAUTH;
 447     } else if ((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0) {
 448         major = GSS_S_DEFECTIVE_TOKEN;
 449         *minor = GSSEAP_WRONG_ITOK;
 450         goto cleanup;
 451     }
 452
 453     major = gssEapMechToGlueName(minor, target, &mechTarget);
 454     if (GSS_ERROR(major))
 455         goto cleanup;
 456
 457     major = gssInitSecContext(minor,
 458                               cred->krbCred,
 459                               &ctx->kerberosCtx,
 460                               mechTarget,
 461                               (gss_OID)gss_mech_krb5,
 462                               reqFlags | GSS_C_MUTUAL_FLAG,
 463                               timeReq,
 464                               chanBindings,
 465                               inputToken,
 466                               &actualMech,
 467                               outputToken,
 468                               &gssFlags,
 469                               &timeRec);
 470     if (GSS_ERROR(major))
 471         goto cleanup;
 472
 473     ctx->gssFlags = gssFlags;
 474
 475     if (major == GSS_S_COMPLETE) {
 476         assert(GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_REAUTHENTICATE);
 477
 478         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 479         if (GSS_ERROR(major))
 480             goto cleanup;
 481         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 482     } else {
 483         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_REAUTHENTICATE);
 484     }
 485
 486 cleanup:
 487     gssReleaseName(&tmpMinor, &mechTarget);
 488
 489     return major;
 490 }
 491 #endif /* GSSEAP_ENABLE_REAUTH */
 492
 493 #ifdef GSSEAP_DEBUG
 494 static OM_uint32
 495 eapGssSmInitVendorInfo(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                        OM_uint32 *smFlags)
 506 {
 507     OM_uint32 major;
 508
 509     major = makeStringBuffer(minor, "JANET(UK)", outputToken);
 510     if (GSS_ERROR(major))
 511         return major;
 512
 513     return GSS_S_CONTINUE_NEEDED;
 514 }
 515 #endif
 516
 517 static OM_uint32
 518 eapGssSmInitAcceptorName(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                          OM_uint32 *smFlags)
 529 {
 530     OM_uint32 major;
 531
 532     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL &&
 533         ctx->acceptorName != GSS_C_NO_NAME) {
 534
 535         /* Send desired target name to acceptor */
 536         major = gssEapDisplayName(minor, ctx->acceptorName,
 537                                   outputToken, NULL);
 538         if (GSS_ERROR(major))
 539             return major;
 540     } else if (inputToken != GSS_C_NO_BUFFER &&
 541                ctx->acceptorName == GSS_C_NO_NAME) {
 542         /* Accept target name hint from acceptor */
 543         major = gssEapImportName(minor, inputToken,
 544                                  GSS_C_NT_USER_NAME, &ctx->acceptorName);
 545         if (GSS_ERROR(major))
 546             return major;
 547     }
 548
 549     /*
 550      * Currently, other parts of the code assume that the acceptor name
 551      * is available, hence this check.
 552      */
 553     if (ctx->acceptorName == GSS_C_NO_NAME) {
 554         *minor = GSSEAP_NO_ACCEPTOR_NAME;
 555         return GSS_S_FAILURE;
 556     }
 557
 558     return GSS_S_CONTINUE_NEEDED;
 559 }
 560
 561 static OM_uint32
 562 eapGssSmInitIdentity(OM_uint32 *minor,
 563                      gss_cred_id_t cred,
 564                      gss_ctx_id_t ctx,
 565                      gss_name_t target,
 566                      gss_OID mech,
 567                      OM_uint32 reqFlags,
 568                      OM_uint32 timeReq,
 569                      gss_channel_bindings_t chanBindings,
 570                      gss_buffer_t inputToken,
 571                      gss_buffer_t outputToken,
 572                      OM_uint32 *smFlags)
 573 {
 574     struct eap_config eapConfig;
 575
 576     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_REAUTHENTICATE) {
 577         /* server didn't support reauthentication, sent EAP request */
 578         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_INITIAL);
 579         ctx->flags &= ~(CTX_FLAG_KRB_REAUTH);
 580         *smFlags |= SM_FLAG_RESTART;
 581     } else {
 582         *smFlags |= SM_FLAG_FORCE_SEND_TOKEN;
 583     }
 584
 585     assert((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0);
 586     assert(inputToken == GSS_C_NO_BUFFER);
 587
 588     memset(&eapConfig, 0, sizeof(eapConfig));
 589
 590     ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 591                                              &gssEapPolicyCallbacks,
 592                                              ctx,
 593                                              &eapConfig);
 594     if (ctx->initiatorCtx.eap == NULL) {
 595         *minor = GSSEAP_PEER_SM_INIT_FAILURE;
 596         return GSS_S_FAILURE;
 597     }
 598
 599     ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 600
 601     /* poke EAP state machine */
 602     if (eap_peer_sm_step(ctx->initiatorCtx.eap) != 0) {
 603         *minor = GSSEAP_PEER_SM_STEP_FAILURE;
 604         return GSS_S_FAILURE;
 605     }
 606
 607     GSSEAP_SM_TRANSITION_NEXT(ctx);
 608
 609     *minor = 0;
 610
 611     return GSS_S_CONTINUE_NEEDED;
 612 }
 613
 614 static OM_uint32
 615 eapGssSmInitAuthenticate(OM_uint32 *minor,
 616                          gss_cred_id_t cred,
 617                          gss_ctx_id_t ctx,
 618                          gss_name_t target,
 619                          gss_OID mech,
 620                          OM_uint32 reqFlags,
 621                          OM_uint32 timeReq,
 622                          gss_channel_bindings_t chanBindings,
 623                          gss_buffer_t inputToken,
 624                          gss_buffer_t outputToken,
 625                          OM_uint32 *smFlags)
 626 {
 627     OM_uint32 major;
 628     OM_uint32 tmpMinor;
 629     int code;
 630     struct wpabuf *resp = NULL;
 631
 632     *minor = 0;
 633
 634     assert(inputToken != GSS_C_NO_BUFFER);
 635
 636     major = peerConfigInit(minor, cred, ctx);
 637     if (GSS_ERROR(major))
 638         goto cleanup;
 639
 640     assert(ctx->initiatorCtx.eap != NULL);
 641     assert(ctx->flags & CTX_FLAG_EAP_PORT_ENABLED);
 642
 643     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 644
 645     wpabuf_set(&ctx->initiatorCtx.reqData,
 646                inputToken->value, inputToken->length);
 647
 648     major = GSS_S_CONTINUE_NEEDED;
 649
 650     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 651     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 652         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 653
 654         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 655     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 656         major = initReady(minor, ctx, reqFlags);
 657         if (GSS_ERROR(major))
 658             goto cleanup;
 659
 660         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 661         major = GSS_S_CONTINUE_NEEDED;
 662         GSSEAP_SM_TRANSITION_NEXT(ctx);
 663     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 664         major = GSS_S_DEFECTIVE_CREDENTIAL;
 665         *minor = GSSEAP_PEER_AUTH_FAILURE;
 666     } else {
 667         major = GSS_S_DEFECTIVE_TOKEN;
 668         *minor = GSSEAP_PEER_BAD_MESSAGE;
 669     }
 670
 671 cleanup:
 672     if (resp != NULL) {
 673         OM_uint32 tmpMajor;
 674         gss_buffer_desc respBuf;
 675
 676         assert(major == GSS_S_CONTINUE_NEEDED);
 677
 678         respBuf.length = wpabuf_len(resp);
 679         respBuf.value = (void *)wpabuf_head(resp);
 680
 681         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 682         if (GSS_ERROR(tmpMajor)) {
 683             major = tmpMajor;
 684             *minor = tmpMinor;
 685         }
 686     }
 687
 688     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 689     peerConfigFree(&tmpMinor, ctx);
 690
 691     return major;
 692 }
 693
 694 static OM_uint32
 695 eapGssSmInitGssChannelBindings(OM_uint32 *minor,
 696                                gss_cred_id_t cred,
 697                                gss_ctx_id_t ctx,
 698                                gss_name_t target,
 699                                gss_OID mech,
 700                                OM_uint32 reqFlags,
 701                                OM_uint32 timeReq,
 702                                gss_channel_bindings_t chanBindings,
 703                                gss_buffer_t inputToken,
 704                                gss_buffer_t outputToken,
 705                                OM_uint32 *smFlags)
 706 {
 707     OM_uint32 major;
 708     gss_buffer_desc buffer = GSS_C_EMPTY_BUFFER;
 709
 710     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
 711         buffer = chanBindings->application_data;
 712
 713     major = gssEapWrap(minor, ctx, TRUE, GSS_C_QOP_DEFAULT,
 714                        &buffer, NULL, outputToken);
 715     if (GSS_ERROR(major))
 716         return major;
 717
 718     assert(outputToken->value != NULL);
 719
 720     *minor = 0;
 721     return GSS_S_CONTINUE_NEEDED;
 722 }
 723
 724 #ifdef GSSEAP_ENABLE_REAUTH
 725 static OM_uint32
 726 eapGssSmInitReauthCreds(OM_uint32 *minor,
 727                         gss_cred_id_t cred,
 728                         gss_ctx_id_t ctx,
 729                         gss_name_t target,
 730                         gss_OID mech,
 731                         OM_uint32 reqFlags,
 732                         OM_uint32 timeReq,
 733                         gss_channel_bindings_t chanBindings,
 734                         gss_buffer_t inputToken,
 735                         gss_buffer_t outputToken,
 736                         OM_uint32 *smFlags)
 737 {
 738     OM_uint32 major;
 739
 740     if (ctx->gssFlags & GSS_C_MUTUAL_FLAG) {
 741         major = gssEapStoreReauthCreds(minor, ctx, cred, inputToken);
 742         if (GSS_ERROR(major))
 743             return major;
 744     }
 745
 746     *minor = 0;
 747     return GSS_S_CONTINUE_NEEDED;
 748 }
 749 #endif /* GSSEAP_ENABLE_REAUTH */
 750
 751 static OM_uint32
 752 eapGssSmInitCompleteInitiatorExts(OM_uint32 *minor,
 753                                   gss_cred_id_t cred,
 754                                   gss_ctx_id_t ctx,
 755                                   gss_name_t target,
 756                                   gss_OID mech,
 757                                   OM_uint32 reqFlags,
 758                                   OM_uint32 timeReq,
 759                                   gss_channel_bindings_t chanBindings,
 760                                   gss_buffer_t inputToken,
 761                                   gss_buffer_t outputToken,
 762                                   OM_uint32 *smFlags)
 763 {
 764     GSSEAP_SM_TRANSITION_NEXT(ctx);
 765
 766     *minor = 0;
 767     *smFlags |= SM_FLAG_FORCE_SEND_TOKEN;
 768
 769     return GSS_S_CONTINUE_NEEDED;
 770 }
 771
 772 static OM_uint32
 773 eapGssSmInitCompleteAcceptorExts(OM_uint32 *minor,
 774                                  gss_cred_id_t cred,
 775                                  gss_ctx_id_t ctx,
 776                                  gss_name_t target,
 777                                  gss_OID mech,
 778                                  OM_uint32 reqFlags,
 779                                  OM_uint32 timeReq,
 780                                  gss_channel_bindings_t chanBindings,
 781                                  gss_buffer_t inputToken,
 782                                  gss_buffer_t outputToken,
 783                                  OM_uint32 *smFlags)
 784 {
 785     GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 786
 787     *minor = 0;
 788
 789     return GSS_S_COMPLETE;
 790 }
 791
 792 static struct gss_eap_sm eapGssInitiatorSm[] = {
 793     {
 794         ITOK_TYPE_CONTEXT_ERR,
 795         ITOK_TYPE_NONE,
 796         GSSEAP_STATE_ALL & ~(GSSEAP_STATE_INITIAL),
 797         SM_ITOK_FLAG_CRITICAL,
 798         eapGssSmInitError
 799     },
 800     {
 801         ITOK_TYPE_ACCEPTOR_NAME_RESP,
 802         ITOK_TYPE_ACCEPTOR_NAME_REQ,
 803         GSSEAP_STATE_INITIAL | GSSEAP_STATE_AUTHENTICATE,
 804         0,
 805         eapGssSmInitAcceptorName
 806     },
 807 #ifdef GSSEAP_DEBUG
 808     {
 809         ITOK_TYPE_NONE,
 810         ITOK_TYPE_VENDOR_INFO,
 811         GSSEAP_STATE_INITIAL,
 812         0,
 813         eapGssSmInitVendorInfo
 814     },
 815 #endif
 816 #ifdef GSSEAP_ENABLE_REAUTH
 817     {
 818         ITOK_TYPE_REAUTH_RESP,
 819         ITOK_TYPE_REAUTH_REQ,
 820         GSSEAP_STATE_INITIAL | GSSEAP_STATE_REAUTHENTICATE,
 821         0,
 822         eapGssSmInitGssReauth
 823     },
 824 #endif
 825     {
 826         ITOK_TYPE_NONE,
 827         ITOK_TYPE_NONE,
 828         GSSEAP_STATE_INITIAL | GSSEAP_STATE_REAUTHENTICATE,
 829         SM_ITOK_FLAG_CRITICAL | SM_ITOK_FLAG_REQUIRED,
 830         eapGssSmInitIdentity
 831     },
 832     {
 833         ITOK_TYPE_EAP_REQ,
 834         ITOK_TYPE_EAP_RESP,
 835         GSSEAP_STATE_AUTHENTICATE,
 836         SM_ITOK_FLAG_CRITICAL | SM_ITOK_FLAG_REQUIRED,
 837         eapGssSmInitAuthenticate
 838     },
 839     {
 840         ITOK_TYPE_NONE,
 841         ITOK_TYPE_GSS_CHANNEL_BINDINGS,
 842         GSSEAP_STATE_INITIATOR_EXTS,
 843         SM_ITOK_FLAG_CRITICAL | SM_ITOK_FLAG_REQUIRED,
 844         eapGssSmInitGssChannelBindings
 845     },
 846     {
 847         ITOK_TYPE_NONE,
 848         ITOK_TYPE_NONE,
 849         GSSEAP_STATE_INITIATOR_EXTS,
 850         0,
 851         eapGssSmInitCompleteInitiatorExts
 852     },
 853 #ifdef GSSEAP_ENABLE_REAUTH
 854     {
 855         ITOK_TYPE_REAUTH_CREDS,
 856         ITOK_TYPE_NONE,
 857         GSSEAP_STATE_ACCEPTOR_EXTS,
 858         0,
 859         eapGssSmInitReauthCreds
 860     },
 861 #endif
 862     /* other extensions go here */
 863     {
 864         ITOK_TYPE_NONE,
 865         ITOK_TYPE_NONE,
 866         GSSEAP_STATE_ACCEPTOR_EXTS,
 867         0,
 868         eapGssSmInitCompleteAcceptorExts
 869     }
 870 };
 871
 872 OM_uint32
 873 gss_init_sec_context(OM_uint32 *minor,
 874                      gss_cred_id_t cred,
 875                      gss_ctx_id_t *context_handle,
 876                      gss_name_t target_name,
 877                      gss_OID mech_type,
 878                      OM_uint32 req_flags,
 879                      OM_uint32 time_req,
 880                      gss_channel_bindings_t input_chan_bindings,
 881                      gss_buffer_t input_token,
 882                      gss_OID *actual_mech_type,
 883                      gss_buffer_t output_token,
 884                      OM_uint32 *ret_flags,
 885                      OM_uint32 *time_rec)
 886 {
 887     OM_uint32 major, tmpMinor;
 888     gss_ctx_id_t ctx = *context_handle;
 889
 890     *minor = 0;
 891
 892     output_token->length = 0;
 893     output_token->value = NULL;
 894
 895     if (ctx == GSS_C_NO_CONTEXT) {
 896         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 897             *minor = GSSEAP_WRONG_SIZE;
 898             return GSS_S_DEFECTIVE_TOKEN;
 899         }
 900
 901         major = gssEapAllocContext(minor, &ctx);
 902         if (GSS_ERROR(major))
 903             return major;
 904
 905         ctx->flags |= CTX_FLAG_INITIATOR;
 906
 907         major = initBegin(minor, cred, ctx, target_name, mech_type,
 908                           req_flags, time_req, input_chan_bindings);
 909         if (GSS_ERROR(major)) {
 910             gssEapReleaseContext(minor, &ctx);
 911             return major;
 912         }
 913
 914         *context_handle = ctx;
 915     }
 916
 917     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 918
 919     if (cred == GSS_C_NO_CREDENTIAL) {
 920         if (ctx->defaultCred == GSS_C_NO_CREDENTIAL) {
 921             major = gssEapAcquireCred(minor,
 922                                       GSS_C_NO_NAME,
 923                                       GSS_C_NO_BUFFER,
 924                                       time_req,
 925                                       GSS_C_NO_OID_SET,
 926                                       GSS_C_INITIATE,
 927                                       &ctx->defaultCred,
 928                                       NULL,
 929                                       NULL);
 930             if (GSS_ERROR(major))
 931                 goto cleanup;
 932         }
 933
 934         cred = ctx->defaultCred;
 935     }
 936
 937     GSSEAP_MUTEX_LOCK(&cred->mutex);
 938
 939
 940     if ((cred->flags & CRED_FLAG_INITIATE) == 0) {
 941         major = GSS_S_NO_CRED;
 942         *minor = GSSEAP_CRED_USAGE_MISMATCH;
 943         goto cleanup;
 944     }
 945
 946     major = gssEapSmStep(minor,
 947                          cred,
 948                          ctx,
 949                          target_name,
 950                          mech_type,
 951                          req_flags,
 952                          time_req,
 953                          input_chan_bindings,
 954                          input_token,
 955                          output_token,
 956                          eapGssInitiatorSm,
 957                          sizeof(eapGssInitiatorSm) / sizeof(eapGssInitiatorSm[0]));
 958     if (GSS_ERROR(major))
 959         goto cleanup;
 960
 961     if (actual_mech_type != NULL) {
 962         if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
 963             duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
 964     }
 965     if (ret_flags != NULL)
 966         *ret_flags = ctx->gssFlags;
 967     if (time_rec != NULL)
 968         gssEapContextTime(&tmpMinor, ctx, time_rec);
 969
 970     assert(CTX_IS_ESTABLISHED(ctx) || major == GSS_S_CONTINUE_NEEDED);
 971
 972 cleanup:
 973     if (cred != GSS_C_NO_CREDENTIAL)
 974         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
 975     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 976
 977     if (GSS_ERROR(major))
 978         gssEapReleaseContext(&tmpMinor, context_handle);
 979
 980     return major;
 981 }