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 GSSEAP_UNUSED,
 165                   struct wpa_config_blob *blob GSSEAP_UNUSED)
 166 {
 167 }
 168
 169 static const struct wpa_config_blob *
 170 peerGetConfigBlob(void *ctx GSSEAP_UNUSED,
 171                   const char *name GSSEAP_UNUSED)
 172 {
 173     return NULL;
 174 }
 175
 176 static void
 177 peerNotifyPending(void *ctx GSSEAP_UNUSED)
 178 {
 179 }
 180
 181 static struct eapol_callbacks gssEapPolicyCallbacks = {
 182     peerGetConfig,
 183     peerGetBool,
 184     peerSetBool,
 185     peerGetInt,
 186     peerSetInt,
 187     peerGetEapReqData,
 188     peerSetConfigBlob,
 189     peerGetConfigBlob,
 190     peerNotifyPending,
 191 };
 192
 193 #ifdef GSSEAP_DEBUG
 194 extern int wpa_debug_level;
 195 #endif
 196
 197 static OM_uint32
 198 peerConfigInit(OM_uint32 *minor,
 199                gss_cred_id_t cred,
 200                gss_ctx_id_t ctx)
 201 {
 202     krb5_context krbContext;
 203     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 204     krb5_error_code code;
 205     char *identity, *anonymousIdentity;
 206
 207     eapPeerConfig->identity = NULL;
 208     eapPeerConfig->identity_len = 0;
 209     eapPeerConfig->password = NULL;
 210     eapPeerConfig->password_len = 0;
 211
 212     assert(cred != GSS_C_NO_CREDENTIAL);
 213
 214     GSSEAP_KRB_INIT(&krbContext);
 215
 216     eapPeerConfig->fragment_size = 1024;
 217 #ifdef GSSEAP_DEBUG
 218     wpa_debug_level = 0;
 219 #endif
 220
 221     assert(cred->name != GSS_C_NO_NAME);
 222
 223     if ((cred->name->flags & (NAME_FLAG_NAI | NAME_FLAG_SERVICE)) == 0) {
 224         *minor = GSSEAP_BAD_INITIATOR_NAME;
 225         return GSS_S_BAD_NAME;
 226     }
 227
 228     code = krb5_unparse_name(krbContext, cred->name->krbPrincipal, &identity);
 229     if (code != 0) {
 230         *minor = code;
 231         return GSS_S_FAILURE;
 232     }
 233
 234     anonymousIdentity = strchr(identity, '@');
 235     if (anonymousIdentity == NULL)
 236         anonymousIdentity = "";
 237
 238     eapPeerConfig->identity = (unsigned char *)identity;
 239     eapPeerConfig->identity_len = strlen(identity);
 240     eapPeerConfig->anonymous_identity = (unsigned char *)anonymousIdentity;
 241     eapPeerConfig->anonymous_identity_len = strlen(anonymousIdentity);
 242     eapPeerConfig->password = (unsigned char *)cred->password.value;
 243     eapPeerConfig->password_len = cred->password.length;
 244
 245     *minor = 0;
 246     return GSS_S_COMPLETE;
 247 }
 248
 249 static OM_uint32
 250 peerConfigFree(OM_uint32 *minor,
 251                gss_ctx_id_t ctx)
 252 {
 253     krb5_context krbContext;
 254     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 255
 256     GSSEAP_KRB_INIT(&krbContext);
 257
 258     krb5_free_unparsed_name(krbContext, (char *)eapPeerConfig->identity);
 259
 260     *minor = 0;
 261     return GSS_S_COMPLETE;
 262 }
 263
 264 /*
 265  * Mark an initiator context as ready for cryptographic operations
 266  */
 267 static OM_uint32
 268 initReady(OM_uint32 *minor, gss_ctx_id_t ctx, OM_uint32 reqFlags)
 269 {
 270     OM_uint32 major;
 271     const unsigned char *key;
 272     size_t keyLength;
 273
 274 #if 1
 275     /* XXX actually check for mutual auth */
 276     if (reqFlags & GSS_C_MUTUAL_FLAG)
 277         ctx->gssFlags |= GSS_C_MUTUAL_FLAG;
 278 #endif
 279
 280     /* Cache encryption type derived from selected mechanism OID */
 281     major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &ctx->encryptionType);
 282     if (GSS_ERROR(major))
 283         return major;
 284
 285     if (!eap_key_available(ctx->initiatorCtx.eap)) {
 286         *minor = GSSEAP_KEY_UNAVAILABLE;
 287         return GSS_S_UNAVAILABLE;
 288     }
 289
 290     key = eap_get_eapKeyData(ctx->initiatorCtx.eap, &keyLength);
 291
 292     if (keyLength < EAP_EMSK_LEN) {
 293         *minor = GSSEAP_KEY_TOO_SHORT;
 294         return GSS_S_UNAVAILABLE;
 295     }
 296
 297     major = gssEapDeriveRfc3961Key(minor,
 298                                    &key[EAP_EMSK_LEN / 2],
 299                                    EAP_EMSK_LEN / 2,
 300                                    ctx->encryptionType,
 301                                    &ctx->rfc3961Key);
 302        if (GSS_ERROR(major))
 303            return major;
 304
 305     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 306                                       &ctx->checksumType);
 307     if (GSS_ERROR(major))
 308         return major;
 309
 310     major = sequenceInit(minor,
 311                          &ctx->seqState,
 312                          ctx->recvSeq,
 313                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 314                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 315                          TRUE);
 316     if (GSS_ERROR(major))
 317         return major;
 318
 319     *minor = 0;
 320     return GSS_S_COMPLETE;
 321 }
 322
 323 static OM_uint32
 324 initBegin(OM_uint32 *minor,
 325           gss_cred_id_t cred,
 326           gss_ctx_id_t ctx,
 327           gss_name_t target,
 328           gss_OID mech,
 329           OM_uint32 reqFlags GSSEAP_UNUSED,
 330           OM_uint32 timeReq,
 331           gss_channel_bindings_t chanBindings GSSEAP_UNUSED)
 332 {
 333     OM_uint32 major;
 334
 335     assert(cred != GSS_C_NO_CREDENTIAL);
 336
 337     if (cred->expiryTime)
 338         ctx->expiryTime = cred->expiryTime;
 339     else if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
 340         ctx->expiryTime = 0;
 341     else
 342         ctx->expiryTime = time(NULL) + timeReq;
 343
 344     /*
 345      * The credential mutex protects its name, however we need to
 346      * explicitly lock the acceptor name (unlikely as it may be
 347      * that it has attributes set on it).
 348      */
 349     major = gssEapDuplicateName(minor, cred->name, &ctx->initiatorName);
 350     if (GSS_ERROR(major))
 351         return major;
 352
 353     if (target != GSS_C_NO_NAME) {
 354         GSSEAP_MUTEX_LOCK(&target->mutex);
 355
 356         major = gssEapDuplicateName(minor, target, &ctx->acceptorName);
 357         if (GSS_ERROR(major)) {
 358             GSSEAP_MUTEX_UNLOCK(&target->mutex);
 359             return major;
 360         }
 361
 362         GSSEAP_MUTEX_UNLOCK(&target->mutex);
 363     }
 364
 365     if (mech == GSS_C_NULL_OID) {
 366         major = gssEapDefaultMech(minor, &ctx->mechanismUsed);
 367     } else if (gssEapIsConcreteMechanismOid(mech)) {
 368         if (!gssEapInternalizeOid(mech, &ctx->mechanismUsed))
 369             major = duplicateOid(minor, mech, &ctx->mechanismUsed);
 370     } else {
 371         major = GSS_S_BAD_MECH;
 372         *minor = GSSEAP_WRONG_MECH;
 373     }
 374     if (GSS_ERROR(major))
 375         return major;
 376
 377     /* If credentials were provided, check they're usable with this mech */
 378     if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
 379         *minor = GSSEAP_CRED_MECH_MISMATCH;
 380         return GSS_S_BAD_MECH;
 381     }
 382
 383     *minor = 0;
 384     return GSS_S_COMPLETE;
 385 }
 386
 387 static OM_uint32
 388 eapGssSmInitError(OM_uint32 *minor,
 389                   gss_cred_id_t cred GSSEAP_UNUSED,
 390                   gss_ctx_id_t ctx GSSEAP_UNUSED,
 391                   gss_name_t target GSSEAP_UNUSED,
 392                   gss_OID mech GSSEAP_UNUSED,
 393                   OM_uint32 reqFlags GSSEAP_UNUSED,
 394                   OM_uint32 timeReq GSSEAP_UNUSED,
 395                   gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 396                   gss_buffer_t inputToken,
 397                   gss_buffer_t outputToken GSSEAP_UNUSED,
 398                   OM_uint32 *smFlags GSSEAP_UNUSED)
 399 {
 400     OM_uint32 major;
 401     unsigned char *p;
 402
 403     if (inputToken->length < 8) {
 404         *minor = GSSEAP_TOK_TRUNC;
 405         return GSS_S_DEFECTIVE_TOKEN;
 406     }
 407
 408     p = (unsigned char *)inputToken->value;
 409
 410     major = load_uint32_be(&p[0]);
 411     *minor = ERROR_TABLE_BASE_eapg + load_uint32_be(&p[4]);
 412
 413     if (!GSS_ERROR(major) || !IS_WIRE_ERROR(*minor)) {
 414         major = GSS_S_FAILURE;
 415         *minor = GSSEAP_BAD_ERROR_TOKEN;
 416     }
 417
 418     assert(GSS_ERROR(major));
 419
 420     return major;
 421 }
 422
 423 #ifdef GSSEAP_ENABLE_REAUTH
 424 static OM_uint32
 425 eapGssSmInitGssReauth(OM_uint32 *minor,
 426                       gss_cred_id_t cred,
 427                       gss_ctx_id_t ctx,
 428                       gss_name_t target,
 429                       gss_OID mech GSSEAP_UNUSED,
 430                       OM_uint32 reqFlags,
 431                       OM_uint32 timeReq,
 432                       gss_channel_bindings_t chanBindings,
 433                       gss_buffer_t inputToken,
 434                       gss_buffer_t outputToken,
 435                       OM_uint32 *smFlags GSSEAP_UNUSED)
 436 {
 437     OM_uint32 major, tmpMinor;
 438     gss_name_t mechTarget = GSS_C_NO_NAME;
 439     gss_OID actualMech = GSS_C_NO_OID;
 440     OM_uint32 gssFlags, timeRec;
 441
 442     assert(cred != GSS_C_NO_CREDENTIAL);
 443
 444     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL) {
 445         if (!gssEapCanReauthP(cred, target, timeReq))
 446             return GSS_S_CONTINUE_NEEDED;
 447
 448         ctx->flags |= CTX_FLAG_KRB_REAUTH;
 449     } else if ((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0) {
 450         major = GSS_S_DEFECTIVE_TOKEN;
 451         *minor = GSSEAP_WRONG_ITOK;
 452         goto cleanup;
 453     }
 454
 455     major = gssEapMechToGlueName(minor, target, &mechTarget);
 456     if (GSS_ERROR(major))
 457         goto cleanup;
 458
 459     major = gssInitSecContext(minor,
 460                               cred->krbCred,
 461                               &ctx->kerberosCtx,
 462                               mechTarget,
 463                               (gss_OID)gss_mech_krb5,
 464                               reqFlags | GSS_C_MUTUAL_FLAG,
 465                               timeReq,
 466                               chanBindings,
 467                               inputToken,
 468                               &actualMech,
 469                               outputToken,
 470                               &gssFlags,
 471                               &timeRec);
 472     if (GSS_ERROR(major))
 473         goto cleanup;
 474
 475     ctx->gssFlags = gssFlags;
 476
 477     if (major == GSS_S_COMPLETE) {
 478         assert(GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_REAUTHENTICATE);
 479
 480         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 481         if (GSS_ERROR(major))
 482             goto cleanup;
 483         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 484     } else {
 485         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_REAUTHENTICATE);
 486     }
 487
 488 cleanup:
 489     gssReleaseName(&tmpMinor, &mechTarget);
 490
 491     return major;
 492 }
 493 #endif /* GSSEAP_ENABLE_REAUTH */
 494
 495 #ifdef GSSEAP_DEBUG
 496 static OM_uint32
 497 eapGssSmInitVendorInfo(OM_uint32 *minor,
 498                        gss_cred_id_t cred GSSEAP_UNUSED,
 499                        gss_ctx_id_t ctx GSSEAP_UNUSED,
 500                        gss_name_t target GSSEAP_UNUSED,
 501                        gss_OID mech GSSEAP_UNUSED,
 502                        OM_uint32 reqFlags GSSEAP_UNUSED,
 503                        OM_uint32 timeReq GSSEAP_UNUSED,
 504                        gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 505                        gss_buffer_t inputToken GSSEAP_UNUSED,
 506                        gss_buffer_t outputToken,
 507                        OM_uint32 *smFlags GSSEAP_UNUSED)
 508 {
 509     OM_uint32 major;
 510
 511     major = makeStringBuffer(minor, "JANET(UK)", outputToken);
 512     if (GSS_ERROR(major))
 513         return major;
 514
 515     return GSS_S_CONTINUE_NEEDED;
 516 }
 517 #endif
 518
 519 static OM_uint32
 520 eapGssSmInitAcceptorName(OM_uint32 *minor,
 521                          gss_cred_id_t cred GSSEAP_UNUSED,
 522                          gss_ctx_id_t ctx,
 523                          gss_name_t target GSSEAP_UNUSED,
 524                          gss_OID mech GSSEAP_UNUSED,
 525                          OM_uint32 reqFlags GSSEAP_UNUSED,
 526                          OM_uint32 timeReq GSSEAP_UNUSED,
 527                          gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 528                          gss_buffer_t inputToken GSSEAP_UNUSED,
 529                          gss_buffer_t outputToken,
 530                          OM_uint32 *smFlags GSSEAP_UNUSED)
 531 {
 532     OM_uint32 major;
 533
 534     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL &&
 535         ctx->acceptorName != GSS_C_NO_NAME) {
 536
 537         /* Send desired target name to acceptor */
 538         major = gssEapDisplayName(minor, ctx->acceptorName,
 539                                   outputToken, NULL);
 540         if (GSS_ERROR(major))
 541             return major;
 542     } else if (inputToken != GSS_C_NO_BUFFER &&
 543                ctx->acceptorName == GSS_C_NO_NAME) {
 544         /* Accept target name hint from acceptor */
 545         major = gssEapImportName(minor, inputToken,
 546                                  GSS_C_NT_USER_NAME, &ctx->acceptorName);
 547         if (GSS_ERROR(major))
 548             return major;
 549     }
 550
 551     /*
 552      * Currently, other parts of the code assume that the acceptor name
 553      * is available, hence this check.
 554      */
 555     if (ctx->acceptorName == GSS_C_NO_NAME) {
 556         *minor = GSSEAP_NO_ACCEPTOR_NAME;
 557         return GSS_S_FAILURE;
 558     }
 559
 560     return GSS_S_CONTINUE_NEEDED;
 561 }
 562
 563 static OM_uint32
 564 eapGssSmInitIdentity(OM_uint32 *minor,
 565                      gss_cred_id_t cred GSSEAP_UNUSED,
 566                      gss_ctx_id_t ctx,
 567                      gss_name_t target GSSEAP_UNUSED,
 568                      gss_OID mech GSSEAP_UNUSED,
 569                      OM_uint32 reqFlags GSSEAP_UNUSED,
 570                      OM_uint32 timeReq GSSEAP_UNUSED,
 571                      gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 572                      gss_buffer_t inputToken GSSEAP_UNUSED,
 573                      gss_buffer_t outputToken GSSEAP_UNUSED,
 574                      OM_uint32 *smFlags)
 575 {
 576     struct eap_config eapConfig;
 577
 578 #ifdef GSSEAP_ENABLE_REAUTH
 579     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_REAUTHENTICATE) {
 580         OM_uint32 tmpMinor;
 581
 582         /* server didn't support reauthentication, sent EAP request */
 583         gssDeleteSecContext(&tmpMinor, &ctx->kerberosCtx, GSS_C_NO_BUFFER);
 584         ctx->flags &= ~(CTX_FLAG_KRB_REAUTH);
 585         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_INITIAL);
 586     } else
 587 #endif
 588         *smFlags |= SM_FLAG_FORCE_SEND_TOKEN;
 589
 590     assert((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0);
 591     assert(inputToken == GSS_C_NO_BUFFER);
 592
 593     memset(&eapConfig, 0, sizeof(eapConfig));
 594
 595     ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 596                                              &gssEapPolicyCallbacks,
 597                                              ctx,
 598                                              &eapConfig);
 599     if (ctx->initiatorCtx.eap == NULL) {
 600         *minor = GSSEAP_PEER_SM_INIT_FAILURE;
 601         return GSS_S_FAILURE;
 602     }
 603
 604     ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 605
 606     /* poke EAP state machine */
 607     if (eap_peer_sm_step(ctx->initiatorCtx.eap) != 0) {
 608         *minor = GSSEAP_PEER_SM_STEP_FAILURE;
 609         return GSS_S_FAILURE;
 610     }
 611
 612     GSSEAP_SM_TRANSITION_NEXT(ctx);
 613
 614     *minor = 0;
 615
 616     return GSS_S_CONTINUE_NEEDED;
 617 }
 618
 619 static OM_uint32
 620 eapGssSmInitAuthenticate(OM_uint32 *minor,
 621                          gss_cred_id_t cred,
 622                          gss_ctx_id_t ctx,
 623                          gss_name_t target GSSEAP_UNUSED,
 624                          gss_OID mech GSSEAP_UNUSED,
 625                          OM_uint32 reqFlags GSSEAP_UNUSED,
 626                          OM_uint32 timeReq GSSEAP_UNUSED,
 627                          gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 628                          gss_buffer_t inputToken GSSEAP_UNUSED,
 629                          gss_buffer_t outputToken,
 630                          OM_uint32 *smFlags)
 631 {
 632     OM_uint32 major;
 633     OM_uint32 tmpMinor;
 634     int code;
 635     struct wpabuf *resp = NULL;
 636
 637     *minor = 0;
 638
 639     assert(inputToken != GSS_C_NO_BUFFER);
 640
 641     major = peerConfigInit(minor, cred, ctx);
 642     if (GSS_ERROR(major))
 643         goto cleanup;
 644
 645     assert(ctx->initiatorCtx.eap != NULL);
 646     assert(ctx->flags & CTX_FLAG_EAP_PORT_ENABLED);
 647
 648     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 649
 650     wpabuf_set(&ctx->initiatorCtx.reqData,
 651                inputToken->value, inputToken->length);
 652
 653     major = GSS_S_CONTINUE_NEEDED;
 654
 655     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 656     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 657         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 658
 659         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 660     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 661         major = initReady(minor, ctx, reqFlags);
 662         if (GSS_ERROR(major))
 663             goto cleanup;
 664
 665         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 666         major = GSS_S_CONTINUE_NEEDED;
 667         GSSEAP_SM_TRANSITION_NEXT(ctx);
 668     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 669         major = GSS_S_DEFECTIVE_CREDENTIAL;
 670         *minor = GSSEAP_PEER_AUTH_FAILURE;
 671     } else {
 672         major = GSS_S_DEFECTIVE_TOKEN;
 673         *minor = GSSEAP_PEER_BAD_MESSAGE;
 674     }
 675
 676 cleanup:
 677     if (resp != NULL) {
 678         OM_uint32 tmpMajor;
 679         gss_buffer_desc respBuf;
 680
 681         assert(major == GSS_S_CONTINUE_NEEDED);
 682
 683         respBuf.length = wpabuf_len(resp);
 684         respBuf.value = (void *)wpabuf_head(resp);
 685
 686         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 687         if (GSS_ERROR(tmpMajor)) {
 688             major = tmpMajor;
 689             *minor = tmpMinor;
 690         }
 691
 692         *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 693     }
 694
 695     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 696     peerConfigFree(&tmpMinor, ctx);
 697
 698     return major;
 699 }
 700
 701 static OM_uint32
 702 eapGssSmInitGssChannelBindings(OM_uint32 *minor,
 703                                gss_cred_id_t cred GSSEAP_UNUSED,
 704                                gss_ctx_id_t ctx,
 705                                gss_name_t target GSSEAP_UNUSED,
 706                                gss_OID mech GSSEAP_UNUSED,
 707                                OM_uint32 reqFlags GSSEAP_UNUSED,
 708                                OM_uint32 timeReq GSSEAP_UNUSED,
 709                                gss_channel_bindings_t chanBindings,
 710                                gss_buffer_t inputToken GSSEAP_UNUSED,
 711                                gss_buffer_t outputToken,
 712                                OM_uint32 *smFlags)
 713 {
 714     OM_uint32 major;
 715     gss_buffer_desc buffer = GSS_C_EMPTY_BUFFER;
 716
 717     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
 718         buffer = chanBindings->application_data;
 719
 720     major = gssEapWrap(minor, ctx, TRUE, GSS_C_QOP_DEFAULT,
 721                        &buffer, NULL, outputToken);
 722     if (GSS_ERROR(major))
 723         return major;
 724
 725     assert(outputToken->value != NULL);
 726
 727     *minor = 0;
 728     *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 729
 730     return GSS_S_CONTINUE_NEEDED;
 731 }
 732
 733 #ifdef GSSEAP_ENABLE_REAUTH
 734 static OM_uint32
 735 eapGssSmInitReauthCreds(OM_uint32 *minor,
 736                         gss_cred_id_t cred,
 737                         gss_ctx_id_t ctx,
 738                         gss_name_t target GSSEAP_UNUSED,
 739                         gss_OID mech GSSEAP_UNUSED,
 740                         OM_uint32 reqFlags GSSEAP_UNUSED,
 741                         OM_uint32 timeReq GSSEAP_UNUSED,
 742                         gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 743                         gss_buffer_t inputToken,
 744                         gss_buffer_t outputToken GSSEAP_UNUSED,
 745                         OM_uint32 *smFlags GSSEAP_UNUSED)
 746 {
 747     OM_uint32 major;
 748
 749     if (ctx->gssFlags & GSS_C_MUTUAL_FLAG) {
 750         major = gssEapStoreReauthCreds(minor, ctx, cred, inputToken);
 751         if (GSS_ERROR(major))
 752             return major;
 753     }
 754
 755     *minor = 0;
 756     return GSS_S_CONTINUE_NEEDED;
 757 }
 758 #endif /* GSSEAP_ENABLE_REAUTH */
 759
 760 static OM_uint32
 761 eapGssSmInitCompleteInitiatorExts(OM_uint32 *minor,
 762                                   gss_cred_id_t cred GSSEAP_UNUSED,
 763                                   gss_ctx_id_t ctx,
 764                                   gss_name_t target GSSEAP_UNUSED,
 765                                   gss_OID mech GSSEAP_UNUSED,
 766                                   OM_uint32 reqFlags GSSEAP_UNUSED,
 767                                   OM_uint32 timeReq GSSEAP_UNUSED,
 768                                   gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 769                                   gss_buffer_t inputToken GSSEAP_UNUSED,
 770                                   gss_buffer_t outputToken GSSEAP_UNUSED,
 771                                   OM_uint32 *smFlags)
 772 {
 773     GSSEAP_SM_TRANSITION_NEXT(ctx);
 774
 775     *minor = 0;
 776     *smFlags |= SM_FLAG_FORCE_SEND_TOKEN;
 777
 778     return GSS_S_CONTINUE_NEEDED;
 779 }
 780
 781 static OM_uint32
 782 eapGssSmInitCompleteAcceptorExts(OM_uint32 *minor,
 783                                  gss_cred_id_t cred GSSEAP_UNUSED,
 784                                  gss_ctx_id_t ctx,
 785                                  gss_name_t target GSSEAP_UNUSED,
 786                                  gss_OID mech GSSEAP_UNUSED,
 787                                  OM_uint32 reqFlags GSSEAP_UNUSED,
 788                                  OM_uint32 timeReq GSSEAP_UNUSED,
 789                                  gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 790                                  gss_buffer_t inputToken GSSEAP_UNUSED,
 791                                  gss_buffer_t outputToken GSSEAP_UNUSED,
 792                                  OM_uint32 *smFlags GSSEAP_UNUSED)
 793 {
 794     GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 795
 796     *minor = 0;
 797
 798     return GSS_S_COMPLETE;
 799 }
 800
 801 static struct gss_eap_sm eapGssInitiatorSm[] = {
 802     {
 803         ITOK_TYPE_CONTEXT_ERR,
 804         ITOK_TYPE_NONE,
 805         GSSEAP_STATE_ALL & ~(GSSEAP_STATE_INITIAL),
 806         0,
 807         eapGssSmInitError
 808     },
 809     {
 810         ITOK_TYPE_ACCEPTOR_NAME_RESP,
 811         ITOK_TYPE_ACCEPTOR_NAME_REQ,
 812         GSSEAP_STATE_INITIAL | GSSEAP_STATE_AUTHENTICATE,
 813         0,
 814         eapGssSmInitAcceptorName
 815     },
 816 #ifdef GSSEAP_DEBUG
 817     {
 818         ITOK_TYPE_NONE,
 819         ITOK_TYPE_VENDOR_INFO,
 820         GSSEAP_STATE_INITIAL,
 821         0,
 822         eapGssSmInitVendorInfo
 823     },
 824 #endif
 825 #ifdef GSSEAP_ENABLE_REAUTH
 826     {
 827         ITOK_TYPE_REAUTH_RESP,
 828         ITOK_TYPE_REAUTH_REQ,
 829         GSSEAP_STATE_INITIAL | GSSEAP_STATE_REAUTHENTICATE,
 830         0,
 831         eapGssSmInitGssReauth
 832     },
 833 #endif
 834     {
 835         ITOK_TYPE_NONE,
 836         ITOK_TYPE_NONE,
 837 #ifdef GSSEAP_ENABLE_REAUTH
 838         GSSEAP_STATE_REAUTHENTICATE |
 839 #endif
 840         GSSEAP_STATE_INITIAL,
 841         SM_ITOK_FLAG_REQUIRED,
 842         eapGssSmInitIdentity
 843     },
 844     {
 845         ITOK_TYPE_EAP_REQ,
 846         ITOK_TYPE_EAP_RESP,
 847         GSSEAP_STATE_AUTHENTICATE,
 848         SM_ITOK_FLAG_REQUIRED,
 849         eapGssSmInitAuthenticate
 850     },
 851     {
 852         ITOK_TYPE_NONE,
 853         ITOK_TYPE_GSS_CHANNEL_BINDINGS,
 854         GSSEAP_STATE_INITIATOR_EXTS,
 855         SM_ITOK_FLAG_REQUIRED,
 856         eapGssSmInitGssChannelBindings
 857     },
 858     {
 859         ITOK_TYPE_NONE,
 860         ITOK_TYPE_NONE,
 861         GSSEAP_STATE_INITIATOR_EXTS,
 862         0,
 863         eapGssSmInitCompleteInitiatorExts
 864     },
 865 #ifdef GSSEAP_ENABLE_REAUTH
 866     {
 867         ITOK_TYPE_REAUTH_CREDS,
 868         ITOK_TYPE_NONE,
 869         GSSEAP_STATE_ACCEPTOR_EXTS,
 870         0,
 871         eapGssSmInitReauthCreds
 872     },
 873 #endif
 874     /* other extensions go here */
 875     {
 876         ITOK_TYPE_NONE,
 877         ITOK_TYPE_NONE,
 878         GSSEAP_STATE_ACCEPTOR_EXTS,
 879         0,
 880         eapGssSmInitCompleteAcceptorExts
 881     }
 882 };
 883
 884 OM_uint32
 885 gss_init_sec_context(OM_uint32 *minor,
 886                      gss_cred_id_t cred,
 887                      gss_ctx_id_t *context_handle,
 888                      gss_name_t target_name,
 889                      gss_OID mech_type,
 890                      OM_uint32 req_flags,
 891                      OM_uint32 time_req,
 892                      gss_channel_bindings_t input_chan_bindings,
 893                      gss_buffer_t input_token,
 894                      gss_OID *actual_mech_type,
 895                      gss_buffer_t output_token,
 896                      OM_uint32 *ret_flags,
 897                      OM_uint32 *time_rec)
 898 {
 899     OM_uint32 major, tmpMinor;
 900     gss_ctx_id_t ctx = *context_handle;
 901
 902     *minor = 0;
 903
 904     output_token->length = 0;
 905     output_token->value = NULL;
 906
 907     if (ctx == GSS_C_NO_CONTEXT) {
 908         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 909             *minor = GSSEAP_WRONG_SIZE;
 910             return GSS_S_DEFECTIVE_TOKEN;
 911         }
 912
 913         major = gssEapAllocContext(minor, &ctx);
 914         if (GSS_ERROR(major))
 915             return major;
 916
 917         ctx->flags |= CTX_FLAG_INITIATOR;
 918
 919         major = initBegin(minor, cred, ctx, target_name, mech_type,
 920                           req_flags, time_req, input_chan_bindings);
 921         if (GSS_ERROR(major)) {
 922             gssEapReleaseContext(minor, &ctx);
 923             return major;
 924         }
 925
 926         *context_handle = ctx;
 927     }
 928
 929     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 930
 931     if (cred == GSS_C_NO_CREDENTIAL) {
 932         if (ctx->defaultCred == GSS_C_NO_CREDENTIAL) {
 933             major = gssEapAcquireCred(minor,
 934                                       GSS_C_NO_NAME,
 935                                       GSS_C_NO_BUFFER,
 936                                       time_req,
 937                                       GSS_C_NO_OID_SET,
 938                                       GSS_C_INITIATE,
 939                                       &ctx->defaultCred,
 940                                       NULL,
 941                                       NULL);
 942             if (GSS_ERROR(major))
 943                 goto cleanup;
 944         }
 945
 946         cred = ctx->defaultCred;
 947     }
 948
 949     GSSEAP_MUTEX_LOCK(&cred->mutex);
 950
 951
 952     if ((cred->flags & CRED_FLAG_INITIATE) == 0) {
 953         major = GSS_S_NO_CRED;
 954         *minor = GSSEAP_CRED_USAGE_MISMATCH;
 955         goto cleanup;
 956     }
 957
 958     major = gssEapSmStep(minor,
 959                          cred,
 960                          ctx,
 961                          target_name,
 962                          mech_type,
 963                          req_flags,
 964                          time_req,
 965                          input_chan_bindings,
 966                          input_token,
 967                          output_token,
 968                          eapGssInitiatorSm,
 969                          sizeof(eapGssInitiatorSm) / sizeof(eapGssInitiatorSm[0]));
 970     if (GSS_ERROR(major))
 971         goto cleanup;
 972
 973     if (actual_mech_type != NULL) {
 974         if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
 975             duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
 976     }
 977     if (ret_flags != NULL)
 978         *ret_flags = ctx->gssFlags;
 979     if (time_rec != NULL)
 980         gssEapContextTime(&tmpMinor, ctx, time_rec);
 981
 982     assert(CTX_IS_ESTABLISHED(ctx) || major == GSS_S_CONTINUE_NEEDED);
 983
 984 cleanup:
 985     if (cred != GSS_C_NO_CREDENTIAL)
 986         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
 987     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 988
 989     if (GSS_ERROR(major))
 990         gssEapReleaseContext(&tmpMinor, context_handle);
 991
 992     return major;
 993 }