mech_eap/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 #if 0
 562 /* supported inner token types beyond those mandated by specification */
 563 static OM_uint32
 564 gssEapSupportedAcceptorExts[] = {
 565     ITOK_TYPE_REAUTH_CREDS,
 566 };
 567
 568 static OM_uint32
 569 eapGssSmInitExts(OM_uint32 *minor,
 570                  gss_cred_id_t cred,
 571                  gss_ctx_id_t ctx,
 572                  gss_name_t target,
 573                  gss_OID mech,
 574                  OM_uint32 reqFlags,
 575                  OM_uint32 timeReq,
 576                  gss_channel_bindings_t chanBindings,
 577                  gss_buffer_t inputToken,
 578                  gss_buffer_t outputToken,
 579                  OM_uint32 *smFlags)
 580 {
 581     size_t i;
 582     unsigned char *p;
 583
 584     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL) {
 585         outputToken->value = GSSEAP_MALLOC(sizeof(gssEapSupportedAcceptorExts));
 586         if (outputToken->value == NULL) {
 587             *minor = ENOMEM;
 588             return GSS_S_FAILURE;
 589         }
 590         outputToken->length = sizeof(gssEapSupportedAcceptorExts);
 591
 592         for (i = 0, p = (unsigned char *)outputToken->value;
 593              i < sizeof(gssEapSupportedAcceptorExts)
 594                 / sizeof(gssEapSupportedAcceptorExts[0]);
 595             i++) {
 596             store_uint32_be(gssEapSupportedAcceptorExts[i], p);
 597             p += 4;
 598         }
 599     } else if (inputToken != GSS_C_NO_BUFFER) {
 600     }
 601
 602     return GSS_S_CONTINUE_NEEDED;
 603 }
 604 #endif
 605
 606 static OM_uint32
 607 eapGssSmInitIdentity(OM_uint32 *minor,
 608                      gss_cred_id_t cred,
 609                      gss_ctx_id_t ctx,
 610                      gss_name_t target,
 611                      gss_OID mech,
 612                      OM_uint32 reqFlags,
 613                      OM_uint32 timeReq,
 614                      gss_channel_bindings_t chanBindings,
 615                      gss_buffer_t inputToken,
 616                      gss_buffer_t outputToken,
 617                      OM_uint32 *smFlags)
 618 {
 619     struct eap_config eapConfig;
 620
 621 #ifdef GSSEAP_ENABLE_REAUTH
 622     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_REAUTHENTICATE) {
 623         OM_uint32 tmpMinor;
 624
 625         /* server didn't support reauthentication, sent EAP request */
 626         gssDeleteSecContext(&tmpMinor, &ctx->kerberosCtx, GSS_C_NO_BUFFER);
 627         ctx->flags &= ~(CTX_FLAG_KRB_REAUTH);
 628         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_INITIAL);
 629     } else
 630 #endif
 631         *smFlags |= SM_FLAG_FORCE_SEND_TOKEN;
 632
 633     assert((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0);
 634     assert(inputToken == GSS_C_NO_BUFFER);
 635
 636     memset(&eapConfig, 0, sizeof(eapConfig));
 637
 638     ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 639                                              &gssEapPolicyCallbacks,
 640                                              ctx,
 641                                              &eapConfig);
 642     if (ctx->initiatorCtx.eap == NULL) {
 643         *minor = GSSEAP_PEER_SM_INIT_FAILURE;
 644         return GSS_S_FAILURE;
 645     }
 646
 647     ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 648
 649     /* poke EAP state machine */
 650     if (eap_peer_sm_step(ctx->initiatorCtx.eap) != 0) {
 651         *minor = GSSEAP_PEER_SM_STEP_FAILURE;
 652         return GSS_S_FAILURE;
 653     }
 654
 655     GSSEAP_SM_TRANSITION_NEXT(ctx);
 656
 657     *minor = 0;
 658
 659     return GSS_S_CONTINUE_NEEDED;
 660 }
 661
 662 static OM_uint32
 663 eapGssSmInitAuthenticate(OM_uint32 *minor,
 664                          gss_cred_id_t cred,
 665                          gss_ctx_id_t ctx,
 666                          gss_name_t target,
 667                          gss_OID mech,
 668                          OM_uint32 reqFlags,
 669                          OM_uint32 timeReq,
 670                          gss_channel_bindings_t chanBindings,
 671                          gss_buffer_t inputToken,
 672                          gss_buffer_t outputToken,
 673                          OM_uint32 *smFlags)
 674 {
 675     OM_uint32 major;
 676     OM_uint32 tmpMinor;
 677     int code;
 678     struct wpabuf *resp = NULL;
 679
 680     *minor = 0;
 681
 682     assert(inputToken != GSS_C_NO_BUFFER);
 683
 684     major = peerConfigInit(minor, cred, ctx);
 685     if (GSS_ERROR(major))
 686         goto cleanup;
 687
 688     assert(ctx->initiatorCtx.eap != NULL);
 689     assert(ctx->flags & CTX_FLAG_EAP_PORT_ENABLED);
 690
 691     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 692
 693     wpabuf_set(&ctx->initiatorCtx.reqData,
 694                inputToken->value, inputToken->length);
 695
 696     major = GSS_S_CONTINUE_NEEDED;
 697
 698     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 699     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 700         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 701
 702         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 703     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 704         major = initReady(minor, ctx, reqFlags);
 705         if (GSS_ERROR(major))
 706             goto cleanup;
 707
 708         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 709         major = GSS_S_CONTINUE_NEEDED;
 710         GSSEAP_SM_TRANSITION_NEXT(ctx);
 711     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 712         major = GSS_S_DEFECTIVE_CREDENTIAL;
 713         *minor = GSSEAP_PEER_AUTH_FAILURE;
 714     } else {
 715         major = GSS_S_DEFECTIVE_TOKEN;
 716         *minor = GSSEAP_PEER_BAD_MESSAGE;
 717     }
 718
 719 cleanup:
 720     if (resp != NULL) {
 721         OM_uint32 tmpMajor;
 722         gss_buffer_desc respBuf;
 723
 724         assert(major == GSS_S_CONTINUE_NEEDED);
 725
 726         respBuf.length = wpabuf_len(resp);
 727         respBuf.value = (void *)wpabuf_head(resp);
 728
 729         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 730         if (GSS_ERROR(tmpMajor)) {
 731             major = tmpMajor;
 732             *minor = tmpMinor;
 733         }
 734
 735         *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 736     }
 737
 738     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 739     peerConfigFree(&tmpMinor, ctx);
 740
 741     return major;
 742 }
 743
 744 static OM_uint32
 745 eapGssSmInitGssChannelBindings(OM_uint32 *minor,
 746                                gss_cred_id_t cred,
 747                                gss_ctx_id_t ctx,
 748                                gss_name_t target,
 749                                gss_OID mech,
 750                                OM_uint32 reqFlags,
 751                                OM_uint32 timeReq,
 752                                gss_channel_bindings_t chanBindings,
 753                                gss_buffer_t inputToken,
 754                                gss_buffer_t outputToken,
 755                                OM_uint32 *smFlags)
 756 {
 757     OM_uint32 major;
 758     gss_buffer_desc buffer = GSS_C_EMPTY_BUFFER;
 759
 760     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
 761         buffer = chanBindings->application_data;
 762
 763     major = gssEapWrap(minor, ctx, TRUE, GSS_C_QOP_DEFAULT,
 764                        &buffer, NULL, outputToken);
 765     if (GSS_ERROR(major))
 766         return major;
 767
 768     assert(outputToken->value != NULL);
 769
 770     *minor = 0;
 771     *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 772
 773     return GSS_S_CONTINUE_NEEDED;
 774 }
 775
 776 #ifdef GSSEAP_ENABLE_REAUTH
 777 static OM_uint32
 778 eapGssSmInitReauthCreds(OM_uint32 *minor,
 779                         gss_cred_id_t cred,
 780                         gss_ctx_id_t ctx,
 781                         gss_name_t target,
 782                         gss_OID mech,
 783                         OM_uint32 reqFlags,
 784                         OM_uint32 timeReq,
 785                         gss_channel_bindings_t chanBindings,
 786                         gss_buffer_t inputToken,
 787                         gss_buffer_t outputToken,
 788                         OM_uint32 *smFlags)
 789 {
 790     OM_uint32 major;
 791
 792     if (ctx->gssFlags & GSS_C_MUTUAL_FLAG) {
 793         major = gssEapStoreReauthCreds(minor, ctx, cred, inputToken);
 794         if (GSS_ERROR(major))
 795             return major;
 796     }
 797
 798     *minor = 0;
 799     return GSS_S_CONTINUE_NEEDED;
 800 }
 801 #endif /* GSSEAP_ENABLE_REAUTH */
 802
 803 static OM_uint32
 804 eapGssSmInitInitiatorMIC(OM_uint32 *minor,
 805                          gss_cred_id_t cred,
 806                          gss_ctx_id_t ctx,
 807                          gss_name_t target,
 808                          gss_OID mech,
 809                          OM_uint32 reqFlags,
 810                          OM_uint32 timeReq,
 811                          gss_channel_bindings_t chanBindings,
 812                          gss_buffer_t inputToken,
 813                          gss_buffer_t outputToken,
 814                          OM_uint32 *smFlags)
 815 {
 816     OM_uint32 major;
 817
 818     major = gssEapGetConversationMIC(minor, ctx, outputToken);
 819     if (GSS_ERROR(major))
 820         return major;
 821
 822     GSSEAP_SM_TRANSITION_NEXT(ctx);
 823
 824     *minor = 0;
 825     *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 826
 827     return GSS_S_CONTINUE_NEEDED;
 828 }
 829
 830 static OM_uint32
 831 eapGssSmInitCompleteAcceptorExts(OM_uint32 *minor,
 832                                  gss_cred_id_t cred,
 833                                  gss_ctx_id_t ctx,
 834                                  gss_name_t target,
 835                                  gss_OID mech,
 836                                  OM_uint32 reqFlags,
 837                                  OM_uint32 timeReq,
 838                                  gss_channel_bindings_t chanBindings,
 839                                  gss_buffer_t inputToken,
 840                                  gss_buffer_t outputToken,
 841                                  OM_uint32 *smFlags)
 842 {
 843     GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 844
 845     *minor = 0;
 846
 847     return GSS_S_COMPLETE;
 848 }
 849
 850 static struct gss_eap_sm eapGssInitiatorSm[] = {
 851     {
 852         ITOK_TYPE_CONTEXT_ERR,
 853         ITOK_TYPE_NONE,
 854         GSSEAP_STATE_ALL & ~(GSSEAP_STATE_INITIAL),
 855         0,
 856         eapGssSmInitError
 857     },
 858     {
 859         ITOK_TYPE_ACCEPTOR_NAME_RESP,
 860         ITOK_TYPE_ACCEPTOR_NAME_REQ,
 861         GSSEAP_STATE_INITIAL | GSSEAP_STATE_AUTHENTICATE,
 862         0,
 863         eapGssSmInitAcceptorName
 864     },
 865 #if 0
 866     {
 867         ITOK_TYPE_INITIATOR_EXTS,
 868         ITOK_TYPE_ACCEPTOR_EXTS,
 869         GSSEAP_STATE_INITIAL | GSSEAP_STATE_AUTHENTICATE,
 870         0,
 871         eapGssSmInitExts
 872     },
 873 #endif
 874 #ifdef GSSEAP_DEBUG
 875     {
 876         ITOK_TYPE_NONE,
 877         ITOK_TYPE_VENDOR_INFO,
 878         GSSEAP_STATE_INITIAL,
 879         0,
 880         eapGssSmInitVendorInfo
 881     },
 882 #endif
 883 #ifdef GSSEAP_ENABLE_REAUTH
 884     {
 885         ITOK_TYPE_REAUTH_RESP,
 886         ITOK_TYPE_REAUTH_REQ,
 887         GSSEAP_STATE_INITIAL | GSSEAP_STATE_REAUTHENTICATE,
 888         0,
 889         eapGssSmInitGssReauth
 890     },
 891 #endif
 892     {
 893         ITOK_TYPE_NONE,
 894         ITOK_TYPE_NONE,
 895 #ifdef GSSEAP_ENABLE_REAUTH
 896         GSSEAP_STATE_REAUTHENTICATE |
 897 #endif
 898         GSSEAP_STATE_INITIAL,
 899         SM_ITOK_FLAG_REQUIRED,
 900         eapGssSmInitIdentity
 901     },
 902     {
 903         ITOK_TYPE_EAP_REQ,
 904         ITOK_TYPE_EAP_RESP,
 905         GSSEAP_STATE_AUTHENTICATE,
 906         SM_ITOK_FLAG_REQUIRED,
 907         eapGssSmInitAuthenticate
 908     },
 909     {
 910         ITOK_TYPE_NONE,
 911         ITOK_TYPE_GSS_CHANNEL_BINDINGS,
 912         GSSEAP_STATE_INITIATOR_EXTS,
 913         0,
 914         eapGssSmInitGssChannelBindings
 915     },
 916     {
 917         ITOK_TYPE_NONE,
 918         ITOK_TYPE_INITIATOR_MIC,
 919         GSSEAP_STATE_INITIATOR_EXTS,
 920         0,
 921         eapGssSmInitInitiatorMIC
 922     },
 923 #ifdef GSSEAP_ENABLE_REAUTH
 924     {
 925         ITOK_TYPE_REAUTH_CREDS,
 926         ITOK_TYPE_NONE,
 927         GSSEAP_STATE_ACCEPTOR_EXTS,
 928         0,
 929         eapGssSmInitReauthCreds
 930     },
 931 #endif
 932     /* other extensions go here */
 933     {
 934         ITOK_TYPE_NONE,
 935         ITOK_TYPE_NONE,
 936         GSSEAP_STATE_ACCEPTOR_EXTS,
 937         0,
 938         eapGssSmInitCompleteAcceptorExts
 939     }
 940 };
 941
 942 OM_uint32
 943 gss_init_sec_context(OM_uint32 *minor,
 944                      gss_cred_id_t cred,
 945                      gss_ctx_id_t *context_handle,
 946                      gss_name_t target_name,
 947                      gss_OID mech_type,
 948                      OM_uint32 req_flags,
 949                      OM_uint32 time_req,
 950                      gss_channel_bindings_t input_chan_bindings,
 951                      gss_buffer_t input_token,
 952                      gss_OID *actual_mech_type,
 953                      gss_buffer_t output_token,
 954                      OM_uint32 *ret_flags,
 955                      OM_uint32 *time_rec)
 956 {
 957     OM_uint32 major, tmpMinor;
 958     gss_ctx_id_t ctx = *context_handle;
 959
 960     *minor = 0;
 961
 962     output_token->length = 0;
 963     output_token->value = NULL;
 964
 965     if (ctx == GSS_C_NO_CONTEXT) {
 966         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 967             *minor = GSSEAP_WRONG_SIZE;
 968             return GSS_S_DEFECTIVE_TOKEN;
 969         }
 970
 971         major = gssEapAllocContext(minor, &ctx);
 972         if (GSS_ERROR(major))
 973             return major;
 974
 975         ctx->flags |= CTX_FLAG_INITIATOR;
 976
 977         major = initBegin(minor, cred, ctx, target_name, mech_type,
 978                           req_flags, time_req, input_chan_bindings);
 979         if (GSS_ERROR(major)) {
 980             gssEapReleaseContext(minor, &ctx);
 981             return major;
 982         }
 983
 984         *context_handle = ctx;
 985     }
 986
 987     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 988
 989     if (cred == GSS_C_NO_CREDENTIAL) {
 990         if (ctx->defaultCred == GSS_C_NO_CREDENTIAL) {
 991             major = gssEapAcquireCred(minor,
 992                                       GSS_C_NO_NAME,
 993                                       GSS_C_NO_BUFFER,
 994                                       time_req,
 995                                       GSS_C_NO_OID_SET,
 996                                       GSS_C_INITIATE,
 997                                       &ctx->defaultCred,
 998                                       NULL,
 999                                       NULL);
1000             if (GSS_ERROR(major))
1001                 goto cleanup;
1002         }
1003
1004         cred = ctx->defaultCred;
1005     }
1006
1007     GSSEAP_MUTEX_LOCK(&cred->mutex);
1008
1009
1010     if ((cred->flags & CRED_FLAG_INITIATE) == 0) {
1011         major = GSS_S_NO_CRED;
1012         *minor = GSSEAP_CRED_USAGE_MISMATCH;
1013         goto cleanup;
1014     }
1015
1016     major = gssEapSmStep(minor,
1017                          cred,
1018                          ctx,
1019                          target_name,
1020                          mech_type,
1021                          req_flags,
1022                          time_req,
1023                          input_chan_bindings,
1024                          input_token,
1025                          output_token,
1026                          eapGssInitiatorSm,
1027                          sizeof(eapGssInitiatorSm) / sizeof(eapGssInitiatorSm[0]));
1028     if (GSS_ERROR(major))
1029         goto cleanup;
1030
1031     if (actual_mech_type != NULL) {
1032         if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
1033             duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
1034     }
1035     if (ret_flags != NULL)
1036         *ret_flags = ctx->gssFlags;
1037     if (time_rec != NULL)
1038         gssEapContextTime(&tmpMinor, ctx, time_rec);
1039
1040     assert(CTX_IS_ESTABLISHED(ctx) || major == GSS_S_CONTINUE_NEEDED);
1041
1042 cleanup:
1043     if (cred != GSS_C_NO_CREDENTIAL)
1044         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
1045     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
1046
1047     if (GSS_ERROR(major))
1048         gssEapReleaseContext(&tmpMinor, context_handle);
1049
1050     return major;
1051 }