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
 482         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_INITIATOR_EXTS);
 483     } else {
 484         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_REAUTHENTICATE);
 485     }
 486
 487     major = GSS_S_CONTINUE_NEEDED;
 488
 489 cleanup:
 490     gssReleaseName(&tmpMinor, &mechTarget);
 491
 492     return major;
 493 }
 494 #endif /* GSSEAP_ENABLE_REAUTH */
 495
 496 #ifdef GSSEAP_DEBUG
 497 static OM_uint32
 498 eapGssSmInitVendorInfo(OM_uint32 *minor,
 499                        gss_cred_id_t cred,
 500                        gss_ctx_id_t ctx,
 501                        gss_name_t target,
 502                        gss_OID mech,
 503                        OM_uint32 reqFlags,
 504                        OM_uint32 timeReq,
 505                        gss_channel_bindings_t chanBindings,
 506                        gss_buffer_t inputToken,
 507                        gss_buffer_t outputToken,
 508                        OM_uint32 *smFlags)
 509 {
 510     OM_uint32 major;
 511
 512     major = makeStringBuffer(minor, "JANET(UK)", outputToken);
 513     if (GSS_ERROR(major))
 514         return major;
 515
 516     return GSS_S_CONTINUE_NEEDED;
 517 }
 518 #endif
 519
 520 static OM_uint32
 521 eapGssSmInitAcceptorName(OM_uint32 *minor,
 522                          gss_cred_id_t cred,
 523                          gss_ctx_id_t ctx,
 524                          gss_name_t target,
 525                          gss_OID mech,
 526                          OM_uint32 reqFlags,
 527                          OM_uint32 timeReq,
 528                          gss_channel_bindings_t chanBindings,
 529                          gss_buffer_t inputToken,
 530                          gss_buffer_t outputToken,
 531                          OM_uint32 *smFlags)
 532 {
 533     OM_uint32 major;
 534
 535     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL &&
 536         ctx->acceptorName != GSS_C_NO_NAME) {
 537
 538         /* Send desired target name to acceptor */
 539         major = gssEapDisplayName(minor, ctx->acceptorName,
 540                                   outputToken, NULL);
 541         if (GSS_ERROR(major))
 542             return major;
 543     } else if (inputToken != GSS_C_NO_BUFFER &&
 544                ctx->acceptorName == GSS_C_NO_NAME) {
 545         /* Accept target name hint from acceptor */
 546         major = gssEapImportName(minor, inputToken,
 547                                  GSS_C_NT_USER_NAME, &ctx->acceptorName);
 548         if (GSS_ERROR(major))
 549             return major;
 550     }
 551
 552     /*
 553      * Currently, other parts of the code assume that the acceptor name
 554      * is available, hence this check.
 555      */
 556     if (ctx->acceptorName == GSS_C_NO_NAME) {
 557         *minor = GSSEAP_NO_ACCEPTOR_NAME;
 558         return GSS_S_FAILURE;
 559     }
 560
 561     return GSS_S_CONTINUE_NEEDED;
 562 }
 563
 564 #if 0
 565 /* supported inner token types beyond those mandated by specification */
 566 static OM_uint32
 567 gssEapSupportedAcceptorExts[] = {
 568     ITOK_TYPE_REAUTH_CREDS,
 569 };
 570
 571 static OM_uint32
 572 eapGssSmInitExts(OM_uint32 *minor,
 573                  gss_cred_id_t cred,
 574                  gss_ctx_id_t ctx,
 575                  gss_name_t target,
 576                  gss_OID mech,
 577                  OM_uint32 reqFlags,
 578                  OM_uint32 timeReq,
 579                  gss_channel_bindings_t chanBindings,
 580                  gss_buffer_t inputToken,
 581                  gss_buffer_t outputToken,
 582                  OM_uint32 *smFlags)
 583 {
 584     size_t i;
 585     unsigned char *p;
 586
 587     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL) {
 588         outputToken->value = GSSEAP_MALLOC(sizeof(gssEapSupportedAcceptorExts));
 589         if (outputToken->value == NULL) {
 590             *minor = ENOMEM;
 591             return GSS_S_FAILURE;
 592         }
 593         outputToken->length = sizeof(gssEapSupportedAcceptorExts);
 594
 595         for (i = 0, p = (unsigned char *)outputToken->value;
 596              i < sizeof(gssEapSupportedAcceptorExts)
 597                 / sizeof(gssEapSupportedAcceptorExts[0]);
 598             i++) {
 599             store_uint32_be(gssEapSupportedAcceptorExts[i], p);
 600             p += 4;
 601         }
 602     } else if (inputToken != GSS_C_NO_BUFFER) {
 603     }
 604
 605     return GSS_S_CONTINUE_NEEDED;
 606 }
 607 #endif
 608
 609 static OM_uint32
 610 eapGssSmInitIdentity(OM_uint32 *minor,
 611                      gss_cred_id_t cred,
 612                      gss_ctx_id_t ctx,
 613                      gss_name_t target,
 614                      gss_OID mech,
 615                      OM_uint32 reqFlags,
 616                      OM_uint32 timeReq,
 617                      gss_channel_bindings_t chanBindings,
 618                      gss_buffer_t inputToken,
 619                      gss_buffer_t outputToken,
 620                      OM_uint32 *smFlags)
 621 {
 622     struct eap_config eapConfig;
 623
 624 #ifdef GSSEAP_ENABLE_REAUTH
 625     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_REAUTHENTICATE) {
 626         OM_uint32 tmpMinor;
 627
 628         /* server didn't support reauthentication, sent EAP request */
 629         gssDeleteSecContext(&tmpMinor, &ctx->kerberosCtx, GSS_C_NO_BUFFER);
 630         ctx->flags &= ~(CTX_FLAG_KRB_REAUTH);
 631         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_INITIAL);
 632     } else
 633 #endif
 634         *smFlags |= SM_FLAG_FORCE_SEND_TOKEN;
 635
 636     assert((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0);
 637     assert(inputToken == GSS_C_NO_BUFFER);
 638
 639     memset(&eapConfig, 0, sizeof(eapConfig));
 640
 641     ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 642                                              &gssEapPolicyCallbacks,
 643                                              ctx,
 644                                              &eapConfig);
 645     if (ctx->initiatorCtx.eap == NULL) {
 646         *minor = GSSEAP_PEER_SM_INIT_FAILURE;
 647         return GSS_S_FAILURE;
 648     }
 649
 650     ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 651
 652     /* poke EAP state machine */
 653     if (eap_peer_sm_step(ctx->initiatorCtx.eap) != 0) {
 654         *minor = GSSEAP_PEER_SM_STEP_FAILURE;
 655         return GSS_S_FAILURE;
 656     }
 657
 658     GSSEAP_SM_TRANSITION_NEXT(ctx);
 659
 660     *minor = 0;
 661
 662     return GSS_S_CONTINUE_NEEDED;
 663 }
 664
 665 static OM_uint32
 666 eapGssSmInitAuthenticate(OM_uint32 *minor,
 667                          gss_cred_id_t cred,
 668                          gss_ctx_id_t ctx,
 669                          gss_name_t target,
 670                          gss_OID mech,
 671                          OM_uint32 reqFlags,
 672                          OM_uint32 timeReq,
 673                          gss_channel_bindings_t chanBindings,
 674                          gss_buffer_t inputToken,
 675                          gss_buffer_t outputToken,
 676                          OM_uint32 *smFlags)
 677 {
 678     OM_uint32 major;
 679     OM_uint32 tmpMinor;
 680     int code;
 681     struct wpabuf *resp = NULL;
 682
 683     *minor = 0;
 684
 685     assert(inputToken != GSS_C_NO_BUFFER);
 686
 687     major = peerConfigInit(minor, cred, ctx);
 688     if (GSS_ERROR(major))
 689         goto cleanup;
 690
 691     assert(ctx->initiatorCtx.eap != NULL);
 692     assert(ctx->flags & CTX_FLAG_EAP_PORT_ENABLED);
 693
 694     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 695
 696     wpabuf_set(&ctx->initiatorCtx.reqData,
 697                inputToken->value, inputToken->length);
 698
 699     major = GSS_S_CONTINUE_NEEDED;
 700
 701     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 702     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 703         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 704
 705         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 706     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 707         major = initReady(minor, ctx, reqFlags);
 708         if (GSS_ERROR(major))
 709             goto cleanup;
 710
 711         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 712         major = GSS_S_CONTINUE_NEEDED;
 713         GSSEAP_SM_TRANSITION_NEXT(ctx);
 714     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 715         major = GSS_S_DEFECTIVE_CREDENTIAL;
 716         *minor = GSSEAP_PEER_AUTH_FAILURE;
 717     } else {
 718         major = GSS_S_DEFECTIVE_TOKEN;
 719         *minor = GSSEAP_PEER_BAD_MESSAGE;
 720     }
 721
 722 cleanup:
 723     if (resp != NULL) {
 724         OM_uint32 tmpMajor;
 725         gss_buffer_desc respBuf;
 726
 727         assert(major == GSS_S_CONTINUE_NEEDED);
 728
 729         respBuf.length = wpabuf_len(resp);
 730         respBuf.value = (void *)wpabuf_head(resp);
 731
 732         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 733         if (GSS_ERROR(tmpMajor)) {
 734             major = tmpMajor;
 735             *minor = tmpMinor;
 736         }
 737
 738         *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 739     }
 740
 741     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 742     peerConfigFree(&tmpMinor, ctx);
 743
 744     return major;
 745 }
 746
 747 static OM_uint32
 748 eapGssSmInitGssChannelBindings(OM_uint32 *minor,
 749                                gss_cred_id_t cred,
 750                                gss_ctx_id_t ctx,
 751                                gss_name_t target,
 752                                gss_OID mech,
 753                                OM_uint32 reqFlags,
 754                                OM_uint32 timeReq,
 755                                gss_channel_bindings_t chanBindings,
 756                                gss_buffer_t inputToken,
 757                                gss_buffer_t outputToken,
 758                                OM_uint32 *smFlags)
 759 {
 760     OM_uint32 major;
 761     gss_buffer_desc buffer = GSS_C_EMPTY_BUFFER;
 762
 763     if (ctx->flags & CTX_FLAG_KRB_REAUTH)
 764         return GSS_S_CONTINUE_NEEDED;
 765
 766     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
 767         buffer = chanBindings->application_data;
 768
 769     major = gssEapWrap(minor, ctx, TRUE, GSS_C_QOP_DEFAULT,
 770                        &buffer, NULL, outputToken);
 771     if (GSS_ERROR(major))
 772         return major;
 773
 774     assert(outputToken->value != NULL);
 775
 776     *minor = 0;
 777     *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 778
 779     return GSS_S_CONTINUE_NEEDED;
 780 }
 781
 782 #ifdef GSSEAP_ENABLE_REAUTH
 783 static OM_uint32
 784 eapGssSmInitReauthCreds(OM_uint32 *minor,
 785                         gss_cred_id_t cred,
 786                         gss_ctx_id_t ctx,
 787                         gss_name_t target,
 788                         gss_OID mech,
 789                         OM_uint32 reqFlags,
 790                         OM_uint32 timeReq,
 791                         gss_channel_bindings_t chanBindings,
 792                         gss_buffer_t inputToken,
 793                         gss_buffer_t outputToken,
 794                         OM_uint32 *smFlags)
 795 {
 796     OM_uint32 major;
 797
 798     if (ctx->gssFlags & GSS_C_MUTUAL_FLAG) {
 799         major = gssEapStoreReauthCreds(minor, ctx, cred, inputToken);
 800         if (GSS_ERROR(major))
 801             return major;
 802     }
 803
 804     *minor = 0;
 805     return GSS_S_CONTINUE_NEEDED;
 806 }
 807 #endif /* GSSEAP_ENABLE_REAUTH */
 808
 809 static OM_uint32
 810 eapGssSmInitInitiatorMIC(OM_uint32 *minor,
 811                          gss_cred_id_t cred,
 812                          gss_ctx_id_t ctx,
 813                          gss_name_t target,
 814                          gss_OID mech,
 815                          OM_uint32 reqFlags,
 816                          OM_uint32 timeReq,
 817                          gss_channel_bindings_t chanBindings,
 818                          gss_buffer_t inputToken,
 819                          gss_buffer_t outputToken,
 820                          OM_uint32 *smFlags)
 821 {
 822     OM_uint32 major;
 823
 824     major = gssEapGetConversationMIC(minor, ctx, outputToken);
 825     if (GSS_ERROR(major))
 826         return major;
 827
 828     GSSEAP_SM_TRANSITION_NEXT(ctx);
 829
 830     *minor = 0;
 831     *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 832
 833     return GSS_S_CONTINUE_NEEDED;
 834 }
 835
 836 static OM_uint32
 837 eapGssSmInitAcceptorMIC(OM_uint32 *minor,
 838                         gss_cred_id_t cred,
 839                         gss_ctx_id_t ctx,
 840                         gss_name_t target,
 841                         gss_OID mech,
 842                         OM_uint32 reqFlags,
 843                         OM_uint32 timeReq,
 844                         gss_channel_bindings_t chanBindings,
 845                         gss_buffer_t inputToken,
 846                         gss_buffer_t outputToken,
 847                         OM_uint32 *smFlags)
 848 {
 849     OM_uint32 major;
 850
 851     major = gssEapVerifyConversationMIC(minor, ctx, inputToken);
 852     if (GSS_ERROR(major))
 853         return major;
 854
 855     GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 856
 857     *minor = 0;
 858
 859     return GSS_S_COMPLETE;
 860 }
 861
 862 static struct gss_eap_sm eapGssInitiatorSm[] = {
 863     {
 864         ITOK_TYPE_CONTEXT_ERR,
 865         ITOK_TYPE_NONE,
 866         GSSEAP_STATE_ALL & ~(GSSEAP_STATE_INITIAL),
 867         0,
 868         eapGssSmInitError
 869     },
 870     {
 871         ITOK_TYPE_ACCEPTOR_NAME_RESP,
 872         ITOK_TYPE_ACCEPTOR_NAME_REQ,
 873         GSSEAP_STATE_INITIAL | GSSEAP_STATE_AUTHENTICATE,
 874         0,
 875         eapGssSmInitAcceptorName
 876     },
 877 #if 0
 878     {
 879         ITOK_TYPE_INITIATOR_EXTS,
 880         ITOK_TYPE_ACCEPTOR_EXTS,
 881         GSSEAP_STATE_INITIAL | GSSEAP_STATE_AUTHENTICATE,
 882         0,
 883         eapGssSmInitExts
 884     },
 885 #endif
 886 #ifdef GSSEAP_DEBUG
 887     {
 888         ITOK_TYPE_NONE,
 889         ITOK_TYPE_VENDOR_INFO,
 890         GSSEAP_STATE_INITIAL,
 891         0,
 892         eapGssSmInitVendorInfo
 893     },
 894 #endif
 895 #ifdef GSSEAP_ENABLE_REAUTH
 896     {
 897         ITOK_TYPE_REAUTH_RESP,
 898         ITOK_TYPE_REAUTH_REQ,
 899         GSSEAP_STATE_INITIAL | GSSEAP_STATE_REAUTHENTICATE,
 900         0,
 901         eapGssSmInitGssReauth
 902     },
 903 #endif
 904     {
 905         ITOK_TYPE_NONE,
 906         ITOK_TYPE_NONE,
 907 #ifdef GSSEAP_ENABLE_REAUTH
 908         GSSEAP_STATE_REAUTHENTICATE |
 909 #endif
 910         GSSEAP_STATE_INITIAL,
 911         SM_ITOK_FLAG_REQUIRED,
 912         eapGssSmInitIdentity
 913     },
 914     {
 915         ITOK_TYPE_EAP_REQ,
 916         ITOK_TYPE_EAP_RESP,
 917         GSSEAP_STATE_AUTHENTICATE,
 918         SM_ITOK_FLAG_REQUIRED,
 919         eapGssSmInitAuthenticate
 920     },
 921     {
 922         ITOK_TYPE_NONE,
 923         ITOK_TYPE_GSS_CHANNEL_BINDINGS,
 924         GSSEAP_STATE_INITIATOR_EXTS,
 925         0,
 926         eapGssSmInitGssChannelBindings
 927     },
 928     {
 929         ITOK_TYPE_NONE,
 930         ITOK_TYPE_INITIATOR_MIC,
 931         GSSEAP_STATE_INITIATOR_EXTS,
 932         0,
 933         eapGssSmInitInitiatorMIC
 934     },
 935 #ifdef GSSEAP_ENABLE_REAUTH
 936     {
 937         ITOK_TYPE_REAUTH_CREDS,
 938         ITOK_TYPE_NONE,
 939         GSSEAP_STATE_ACCEPTOR_EXTS,
 940         0,
 941         eapGssSmInitReauthCreds
 942     },
 943 #endif
 944     /* other extensions go here */
 945     {
 946         ITOK_TYPE_ACCEPTOR_MIC,
 947         ITOK_TYPE_NONE,
 948         GSSEAP_STATE_ACCEPTOR_EXTS,
 949         SM_ITOK_FLAG_REQUIRED,
 950         eapGssSmInitAcceptorMIC
 951     }
 952 };
 953
 954 OM_uint32
 955 gss_init_sec_context(OM_uint32 *minor,
 956                      gss_cred_id_t cred,
 957                      gss_ctx_id_t *context_handle,
 958                      gss_name_t target_name,
 959                      gss_OID mech_type,
 960                      OM_uint32 req_flags,
 961                      OM_uint32 time_req,
 962                      gss_channel_bindings_t input_chan_bindings,
 963                      gss_buffer_t input_token,
 964                      gss_OID *actual_mech_type,
 965                      gss_buffer_t output_token,
 966                      OM_uint32 *ret_flags,
 967                      OM_uint32 *time_rec)
 968 {
 969     OM_uint32 major, tmpMinor;
 970     gss_ctx_id_t ctx = *context_handle;
 971
 972     *minor = 0;
 973
 974     output_token->length = 0;
 975     output_token->value = NULL;
 976
 977     if (ctx == GSS_C_NO_CONTEXT) {
 978         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 979             *minor = GSSEAP_WRONG_SIZE;
 980             return GSS_S_DEFECTIVE_TOKEN;
 981         }
 982
 983         major = gssEapAllocContext(minor, &ctx);
 984         if (GSS_ERROR(major))
 985             return major;
 986
 987         ctx->flags |= CTX_FLAG_INITIATOR;
 988
 989         major = initBegin(minor, cred, ctx, target_name, mech_type,
 990                           req_flags, time_req, input_chan_bindings);
 991         if (GSS_ERROR(major)) {
 992             gssEapReleaseContext(minor, &ctx);
 993             return major;
 994         }
 995
 996         *context_handle = ctx;
 997     }
 998
 999     GSSEAP_MUTEX_LOCK(&ctx->mutex);
1000
1001     if (cred == GSS_C_NO_CREDENTIAL) {
1002         if (ctx->defaultCred == GSS_C_NO_CREDENTIAL) {
1003             major = gssEapAcquireCred(minor,
1004                                       GSS_C_NO_NAME,
1005                                       GSS_C_NO_BUFFER,
1006                                       time_req,
1007                                       GSS_C_NO_OID_SET,
1008                                       GSS_C_INITIATE,
1009                                       &ctx->defaultCred,
1010                                       NULL,
1011                                       NULL);
1012             if (GSS_ERROR(major))
1013                 goto cleanup;
1014         }
1015
1016         cred = ctx->defaultCred;
1017     }
1018
1019     GSSEAP_MUTEX_LOCK(&cred->mutex);
1020
1021
1022     if ((cred->flags & CRED_FLAG_INITIATE) == 0) {
1023         major = GSS_S_NO_CRED;
1024         *minor = GSSEAP_CRED_USAGE_MISMATCH;
1025         goto cleanup;
1026     }
1027
1028     major = gssEapSmStep(minor,
1029                          cred,
1030                          ctx,
1031                          target_name,
1032                          mech_type,
1033                          req_flags,
1034                          time_req,
1035                          input_chan_bindings,
1036                          input_token,
1037                          output_token,
1038                          eapGssInitiatorSm,
1039                          sizeof(eapGssInitiatorSm) / sizeof(eapGssInitiatorSm[0]));
1040     if (GSS_ERROR(major))
1041         goto cleanup;
1042
1043     if (actual_mech_type != NULL) {
1044         if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
1045             duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
1046     }
1047     if (ret_flags != NULL)
1048         *ret_flags = ctx->gssFlags;
1049     if (time_rec != NULL)
1050         gssEapContextTime(&tmpMinor, ctx, time_rec);
1051
1052     assert(CTX_IS_ESTABLISHED(ctx) || major == GSS_S_CONTINUE_NEEDED);
1053
1054 cleanup:
1055     if (cred != GSS_C_NO_CREDENTIAL)
1056         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
1057     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
1058
1059     if (GSS_ERROR(major))
1060         gssEapReleaseContext(&tmpMinor, context_handle);
1061
1062     return major;
1063 }