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 userChanBindings,
 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     struct gss_channel_bindings_struct wireChanBindings = { 0 };
 440
 441     assert(cred != GSS_C_NO_CREDENTIAL);
 442
 443     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL) {
 444         if (!gssEapCanReauthP(cred, target, timeReq)) {
 445             major = GSS_S_CONTINUE_NEEDED;
 446             goto cleanup;
 447         }
 448
 449         major = gssEapMakeTokenChannelBindings(minor, ctx,
 450                                                userChanBindings,
 451                                                GSS_C_NO_BUFFER,
 452                                                &wireChanBindings);
 453         if (GSS_ERROR(major))
 454             goto cleanup;
 455
 456         ctx->flags |= CTX_FLAG_KRB_REAUTH;
 457     } else if ((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0) {
 458         major = GSS_S_DEFECTIVE_TOKEN;
 459         *minor = GSSEAP_WRONG_ITOK;
 460         goto cleanup;
 461     }
 462
 463     major = gssEapMechToGlueName(minor, target, &mechTarget);
 464     if (GSS_ERROR(major))
 465         goto cleanup;
 466
 467     major = gssInitSecContext(minor,
 468                               cred->krbCred,
 469                               &ctx->kerberosCtx,
 470                               mechTarget,
 471                               (gss_OID)gss_mech_krb5,
 472                               reqFlags | GSS_C_MUTUAL_FLAG,
 473                               timeReq,
 474                               &wireChanBindings,
 475                               inputToken,
 476                               &actualMech,
 477                               outputToken,
 478                               &gssFlags,
 479                               &timeRec);
 480     if (GSS_ERROR(major))
 481         goto cleanup;
 482
 483     ctx->gssFlags = gssFlags;
 484
 485     if (major == GSS_S_COMPLETE) {
 486         assert(GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_REAUTHENTICATE);
 487
 488         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 489         if (GSS_ERROR(major))
 490             goto cleanup;
 491
 492         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ACCEPTOR_EXTS);
 493     } else {
 494         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_REAUTHENTICATE);
 495         *smFlags |= SM_FLAG_SEND_TOKEN;
 496     }
 497
 498     major = GSS_S_CONTINUE_NEEDED;
 499
 500 cleanup:
 501     gssReleaseName(&tmpMinor, &mechTarget);
 502     gss_release_buffer(&tmpMinor, &wireChanBindings.application_data);
 503
 504     return major;
 505 }
 506 #endif /* GSSEAP_ENABLE_REAUTH */
 507
 508 #ifdef GSSEAP_DEBUG
 509 static OM_uint32
 510 eapGssSmInitVendorInfo(OM_uint32 *minor,
 511                        gss_cred_id_t cred,
 512                        gss_ctx_id_t ctx,
 513                        gss_name_t target,
 514                        gss_OID mech,
 515                        OM_uint32 reqFlags,
 516                        OM_uint32 timeReq,
 517                        gss_channel_bindings_t chanBindings,
 518                        gss_buffer_t inputToken,
 519                        gss_buffer_t outputToken,
 520                        OM_uint32 *smFlags)
 521 {
 522     OM_uint32 major;
 523
 524     major = makeStringBuffer(minor, "JANET(UK)", outputToken);
 525     if (GSS_ERROR(major))
 526         return major;
 527
 528     return GSS_S_CONTINUE_NEEDED;
 529 }
 530 #endif
 531
 532 static OM_uint32
 533 eapGssSmInitAcceptorName(OM_uint32 *minor,
 534                          gss_cred_id_t cred,
 535                          gss_ctx_id_t ctx,
 536                          gss_name_t target,
 537                          gss_OID mech,
 538                          OM_uint32 reqFlags,
 539                          OM_uint32 timeReq,
 540                          gss_channel_bindings_t chanBindings,
 541                          gss_buffer_t inputToken,
 542                          gss_buffer_t outputToken,
 543                          OM_uint32 *smFlags)
 544 {
 545     OM_uint32 major;
 546
 547     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL &&
 548         ctx->acceptorName != GSS_C_NO_NAME) {
 549
 550         /* Send desired target name to acceptor */
 551         major = gssEapDisplayName(minor, ctx->acceptorName,
 552                                   outputToken, NULL);
 553         if (GSS_ERROR(major))
 554             return major;
 555     } else if (inputToken != GSS_C_NO_BUFFER &&
 556                ctx->acceptorName == GSS_C_NO_NAME) {
 557         /* Accept target name hint from acceptor */
 558         major = gssEapImportName(minor, inputToken,
 559                                  GSS_C_NT_USER_NAME, &ctx->acceptorName);
 560         if (GSS_ERROR(major))
 561             return major;
 562     }
 563
 564     /*
 565      * Currently, other parts of the code assume that the acceptor name
 566      * is available, hence this check.
 567      */
 568     if (ctx->acceptorName == GSS_C_NO_NAME) {
 569         *minor = GSSEAP_NO_ACCEPTOR_NAME;
 570         return GSS_S_FAILURE;
 571     }
 572
 573     return GSS_S_CONTINUE_NEEDED;
 574 }
 575
 576 static OM_uint32
 577 gssEapSupportedAcceptorExts[] = {
 578     ITOK_TYPE_REAUTH_CREDS,
 579 };
 580
 581 static struct gss_eap_itok_map
 582 gssEapInitiatorExtsFlagMap[] = {
 583 };
 584
 585 static OM_uint32
 586 eapGssSmInitExts(OM_uint32 *minor,
 587                  gss_cred_id_t cred,
 588                  gss_ctx_id_t ctx,
 589                  gss_name_t target,
 590                  gss_OID mech,
 591                  OM_uint32 reqFlags,
 592                  OM_uint32 timeReq,
 593                  gss_channel_bindings_t chanBindings,
 594                  gss_buffer_t inputToken,
 595                  gss_buffer_t outputToken,
 596                  OM_uint32 *smFlags)
 597 {
 598     OM_uint32 major;
 599
 600     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL) {
 601         major = gssEapEncodeExtensions(minor,
 602                                        gssEapSupportedAcceptorExts,
 603                                        sizeof(gssEapSupportedAcceptorExts) /
 604                                             sizeof(gssEapSupportedAcceptorExts[0]),
 605                                        outputToken);
 606     } else if (inputToken != GSS_C_NO_BUFFER) {
 607         major = gssEapProcessExtensions(minor, inputToken,
 608                                         gssEapInitiatorExtsFlagMap,
 609                                         sizeof(gssEapInitiatorExtsFlagMap) /
 610                                             sizeof(gssEapInitiatorExtsFlagMap[0]),
 611                                         &ctx->flags);
 612     }
 613
 614     if (GSS_ERROR(major))
 615         return major;
 616
 617     return GSS_S_CONTINUE_NEEDED;
 618 }
 619
 620 static OM_uint32
 621 eapGssSmInitIdentity(OM_uint32 *minor,
 622                      gss_cred_id_t cred,
 623                      gss_ctx_id_t ctx,
 624                      gss_name_t target,
 625                      gss_OID mech,
 626                      OM_uint32 reqFlags,
 627                      OM_uint32 timeReq,
 628                      gss_channel_bindings_t chanBindings,
 629                      gss_buffer_t inputToken,
 630                      gss_buffer_t outputToken,
 631                      OM_uint32 *smFlags)
 632 {
 633     struct eap_config eapConfig;
 634
 635 #ifdef GSSEAP_ENABLE_REAUTH
 636     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_REAUTHENTICATE) {
 637         OM_uint32 tmpMinor;
 638
 639         /* server didn't support reauthentication, sent EAP request */
 640         gssDeleteSecContext(&tmpMinor, &ctx->kerberosCtx, GSS_C_NO_BUFFER);
 641         ctx->flags &= ~(CTX_FLAG_KRB_REAUTH);
 642         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_INITIAL);
 643     } else
 644 #endif
 645         *smFlags |= SM_FLAG_SEND_TOKEN;
 646
 647     assert((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0);
 648     assert(inputToken == GSS_C_NO_BUFFER);
 649
 650     memset(&eapConfig, 0, sizeof(eapConfig));
 651
 652     ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 653                                              &gssEapPolicyCallbacks,
 654                                              ctx,
 655                                              &eapConfig);
 656     if (ctx->initiatorCtx.eap == NULL) {
 657         *minor = GSSEAP_PEER_SM_INIT_FAILURE;
 658         return GSS_S_FAILURE;
 659     }
 660
 661     ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 662
 663     /* poke EAP state machine */
 664     if (eap_peer_sm_step(ctx->initiatorCtx.eap) != 0) {
 665         *minor = GSSEAP_PEER_SM_STEP_FAILURE;
 666         return GSS_S_FAILURE;
 667     }
 668
 669     GSSEAP_SM_TRANSITION_NEXT(ctx);
 670
 671     *minor = 0;
 672
 673     return GSS_S_CONTINUE_NEEDED;
 674 }
 675
 676 static OM_uint32
 677 eapGssSmInitAuthenticate(OM_uint32 *minor,
 678                          gss_cred_id_t cred,
 679                          gss_ctx_id_t ctx,
 680                          gss_name_t target,
 681                          gss_OID mech,
 682                          OM_uint32 reqFlags,
 683                          OM_uint32 timeReq,
 684                          gss_channel_bindings_t chanBindings,
 685                          gss_buffer_t inputToken,
 686                          gss_buffer_t outputToken,
 687                          OM_uint32 *smFlags)
 688 {
 689     OM_uint32 major;
 690     OM_uint32 tmpMinor;
 691     int code;
 692     struct wpabuf *resp = NULL;
 693
 694     *minor = 0;
 695
 696     assert(inputToken != GSS_C_NO_BUFFER);
 697
 698     major = peerConfigInit(minor, cred, ctx);
 699     if (GSS_ERROR(major))
 700         goto cleanup;
 701
 702     assert(ctx->initiatorCtx.eap != NULL);
 703     assert(ctx->flags & CTX_FLAG_EAP_PORT_ENABLED);
 704
 705     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 706
 707     wpabuf_set(&ctx->initiatorCtx.reqData,
 708                inputToken->value, inputToken->length);
 709
 710     major = GSS_S_CONTINUE_NEEDED;
 711
 712     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 713     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 714         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 715
 716         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 717     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 718         major = initReady(minor, ctx, reqFlags);
 719         if (GSS_ERROR(major))
 720             goto cleanup;
 721
 722         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 723         major = GSS_S_CONTINUE_NEEDED;
 724         GSSEAP_SM_TRANSITION_NEXT(ctx);
 725     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 726         major = GSS_S_DEFECTIVE_CREDENTIAL;
 727         *minor = GSSEAP_PEER_AUTH_FAILURE;
 728     } else {
 729         major = GSS_S_DEFECTIVE_TOKEN;
 730         *minor = GSSEAP_PEER_BAD_MESSAGE;
 731     }
 732
 733 cleanup:
 734     if (resp != NULL) {
 735         OM_uint32 tmpMajor;
 736         gss_buffer_desc respBuf;
 737
 738         assert(major == GSS_S_CONTINUE_NEEDED);
 739
 740         respBuf.length = wpabuf_len(resp);
 741         respBuf.value = (void *)wpabuf_head(resp);
 742
 743         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 744         if (GSS_ERROR(tmpMajor)) {
 745             major = tmpMajor;
 746             *minor = tmpMinor;
 747         }
 748
 749         *smFlags |= SM_FLAG_SEND_TOKEN | SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 750     }
 751
 752     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 753     peerConfigFree(&tmpMinor, ctx);
 754
 755     return major;
 756 }
 757
 758 static OM_uint32
 759 eapGssSmInitGssChannelBindings(OM_uint32 *minor,
 760                                gss_cred_id_t cred,
 761                                gss_ctx_id_t ctx,
 762                                gss_name_t target,
 763                                gss_OID mech,
 764                                OM_uint32 reqFlags,
 765                                OM_uint32 timeReq,
 766                                gss_channel_bindings_t chanBindings,
 767                                gss_buffer_t inputToken,
 768                                gss_buffer_t outputToken,
 769                                OM_uint32 *smFlags)
 770 {
 771     OM_uint32 major;
 772     gss_buffer_desc buffer = GSS_C_EMPTY_BUFFER;
 773
 774     if (ctx->flags & CTX_FLAG_KRB_REAUTH)
 775         return GSS_S_CONTINUE_NEEDED;
 776
 777     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
 778         buffer = chanBindings->application_data;
 779
 780     major = gssEapWrap(minor, ctx, TRUE, GSS_C_QOP_DEFAULT,
 781                        &buffer, NULL, outputToken);
 782     if (GSS_ERROR(major))
 783         return major;
 784
 785     assert(outputToken->value != NULL);
 786
 787     *minor = 0;
 788     *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 789
 790     return GSS_S_CONTINUE_NEEDED;
 791 }
 792
 793 #ifdef GSSEAP_ENABLE_REAUTH
 794 static OM_uint32
 795 eapGssSmInitReauthCreds(OM_uint32 *minor,
 796                         gss_cred_id_t cred,
 797                         gss_ctx_id_t ctx,
 798                         gss_name_t target,
 799                         gss_OID mech,
 800                         OM_uint32 reqFlags,
 801                         OM_uint32 timeReq,
 802                         gss_channel_bindings_t chanBindings,
 803                         gss_buffer_t inputToken,
 804                         gss_buffer_t outputToken,
 805                         OM_uint32 *smFlags)
 806 {
 807     OM_uint32 major;
 808
 809     if (ctx->gssFlags & GSS_C_MUTUAL_FLAG) {
 810         major = gssEapStoreReauthCreds(minor, ctx, cred, inputToken);
 811         if (GSS_ERROR(major))
 812             return major;
 813     }
 814
 815     *minor = 0;
 816     return GSS_S_CONTINUE_NEEDED;
 817 }
 818 #endif /* GSSEAP_ENABLE_REAUTH */
 819
 820 static OM_uint32
 821 eapGssSmInitInitiatorMIC(OM_uint32 *minor,
 822                          gss_cred_id_t cred,
 823                          gss_ctx_id_t ctx,
 824                          gss_name_t target,
 825                          gss_OID mech,
 826                          OM_uint32 reqFlags,
 827                          OM_uint32 timeReq,
 828                          gss_channel_bindings_t chanBindings,
 829                          gss_buffer_t inputToken,
 830                          gss_buffer_t outputToken,
 831                          OM_uint32 *smFlags)
 832 {
 833     OM_uint32 major;
 834
 835     major = gssEapGetConversationMIC(minor, ctx, outputToken);
 836     if (GSS_ERROR(major))
 837         return major;
 838
 839     GSSEAP_SM_TRANSITION_NEXT(ctx);
 840
 841     *minor = 0;
 842     *smFlags |= SM_FLAG_SEND_TOKEN | SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 843
 844     return GSS_S_CONTINUE_NEEDED;
 845 }
 846
 847 static OM_uint32
 848 eapGssSmInitAcceptorMIC(OM_uint32 *minor,
 849                         gss_cred_id_t cred,
 850                         gss_ctx_id_t ctx,
 851                         gss_name_t target,
 852                         gss_OID mech,
 853                         OM_uint32 reqFlags,
 854                         OM_uint32 timeReq,
 855                         gss_channel_bindings_t chanBindings,
 856                         gss_buffer_t inputToken,
 857                         gss_buffer_t outputToken,
 858                         OM_uint32 *smFlags)
 859 {
 860     OM_uint32 major;
 861
 862     major = gssEapVerifyConversationMIC(minor, ctx, inputToken);
 863     if (GSS_ERROR(major))
 864         return major;
 865
 866     GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 867
 868     *minor = 0;
 869
 870     return GSS_S_COMPLETE;
 871 }
 872
 873 static struct gss_eap_sm eapGssInitiatorSm[] = {
 874     {
 875         ITOK_TYPE_CONTEXT_ERR,
 876         ITOK_TYPE_NONE,
 877         GSSEAP_STATE_ALL & ~(GSSEAP_STATE_INITIAL),
 878         0,
 879         eapGssSmInitError
 880     },
 881     {
 882         ITOK_TYPE_ACCEPTOR_NAME_RESP,
 883         ITOK_TYPE_ACCEPTOR_NAME_REQ,
 884         GSSEAP_STATE_INITIAL | GSSEAP_STATE_AUTHENTICATE,
 885         0,
 886         eapGssSmInitAcceptorName
 887     },
 888     {
 889         ITOK_TYPE_INITIATOR_EXTS,
 890         ITOK_TYPE_ACCEPTOR_EXTS,
 891         GSSEAP_STATE_INITIAL | GSSEAP_STATE_AUTHENTICATE,
 892         0,
 893         eapGssSmInitExts
 894     },
 895 #ifdef GSSEAP_DEBUG
 896     {
 897         ITOK_TYPE_NONE,
 898         ITOK_TYPE_VENDOR_INFO,
 899         GSSEAP_STATE_INITIAL,
 900         0,
 901         eapGssSmInitVendorInfo
 902     },
 903 #endif
 904 #ifdef GSSEAP_ENABLE_REAUTH
 905     {
 906         ITOK_TYPE_REAUTH_RESP,
 907         ITOK_TYPE_REAUTH_REQ,
 908         GSSEAP_STATE_INITIAL | GSSEAP_STATE_REAUTHENTICATE,
 909         0,
 910         eapGssSmInitGssReauth
 911     },
 912 #endif
 913     {
 914         ITOK_TYPE_NONE,
 915         ITOK_TYPE_NONE,
 916 #ifdef GSSEAP_ENABLE_REAUTH
 917         GSSEAP_STATE_REAUTHENTICATE |
 918 #endif
 919         GSSEAP_STATE_INITIAL,
 920         SM_ITOK_FLAG_REQUIRED,
 921         eapGssSmInitIdentity
 922     },
 923     {
 924         ITOK_TYPE_EAP_REQ,
 925         ITOK_TYPE_EAP_RESP,
 926         GSSEAP_STATE_AUTHENTICATE,
 927         SM_ITOK_FLAG_REQUIRED,
 928         eapGssSmInitAuthenticate
 929     },
 930     {
 931         ITOK_TYPE_NONE,
 932         ITOK_TYPE_GSS_CHANNEL_BINDINGS,
 933         GSSEAP_STATE_INITIATOR_EXTS,
 934         0,
 935         eapGssSmInitGssChannelBindings
 936     },
 937     {
 938         ITOK_TYPE_NONE,
 939         ITOK_TYPE_INITIATOR_MIC,
 940         GSSEAP_STATE_INITIATOR_EXTS,
 941         0,
 942         eapGssSmInitInitiatorMIC
 943     },
 944 #ifdef GSSEAP_ENABLE_REAUTH
 945     {
 946         ITOK_TYPE_REAUTH_CREDS,
 947         ITOK_TYPE_NONE,
 948         GSSEAP_STATE_ACCEPTOR_EXTS,
 949         0,
 950         eapGssSmInitReauthCreds
 951     },
 952 #endif
 953     /* other extensions go here */
 954     {
 955         ITOK_TYPE_ACCEPTOR_MIC,
 956         ITOK_TYPE_NONE,
 957         GSSEAP_STATE_ACCEPTOR_EXTS,
 958         SM_ITOK_FLAG_REQUIRED,
 959         eapGssSmInitAcceptorMIC
 960     }
 961 };
 962
 963 OM_uint32
 964 gss_init_sec_context(OM_uint32 *minor,
 965                      gss_cred_id_t cred,
 966                      gss_ctx_id_t *context_handle,
 967                      gss_name_t target_name,
 968                      gss_OID mech_type,
 969                      OM_uint32 req_flags,
 970                      OM_uint32 time_req,
 971                      gss_channel_bindings_t input_chan_bindings,
 972                      gss_buffer_t input_token,
 973                      gss_OID *actual_mech_type,
 974                      gss_buffer_t output_token,
 975                      OM_uint32 *ret_flags,
 976                      OM_uint32 *time_rec)
 977 {
 978     OM_uint32 major, tmpMinor;
 979     gss_ctx_id_t ctx = *context_handle;
 980
 981     *minor = 0;
 982
 983     output_token->length = 0;
 984     output_token->value = NULL;
 985
 986     if (ctx == GSS_C_NO_CONTEXT) {
 987         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 988             *minor = GSSEAP_WRONG_SIZE;
 989             return GSS_S_DEFECTIVE_TOKEN;
 990         }
 991
 992         major = gssEapAllocContext(minor, &ctx);
 993         if (GSS_ERROR(major))
 994             return major;
 995
 996         ctx->flags |= CTX_FLAG_INITIATOR;
 997
 998         major = initBegin(minor, cred, ctx, target_name, mech_type,
 999                           req_flags, time_req, input_chan_bindings);
1000         if (GSS_ERROR(major)) {
1001             gssEapReleaseContext(minor, &ctx);
1002             return major;
1003         }
1004
1005         *context_handle = ctx;
1006     }
1007
1008     GSSEAP_MUTEX_LOCK(&ctx->mutex);
1009
1010     if (cred == GSS_C_NO_CREDENTIAL) {
1011         if (ctx->defaultCred == GSS_C_NO_CREDENTIAL) {
1012             major = gssEapAcquireCred(minor,
1013                                       GSS_C_NO_NAME,
1014                                       GSS_C_NO_BUFFER,
1015                                       time_req,
1016                                       GSS_C_NO_OID_SET,
1017                                       GSS_C_INITIATE,
1018                                       &ctx->defaultCred,
1019                                       NULL,
1020                                       NULL);
1021             if (GSS_ERROR(major))
1022                 goto cleanup;
1023         }
1024
1025         cred = ctx->defaultCred;
1026     }
1027
1028     GSSEAP_MUTEX_LOCK(&cred->mutex);
1029
1030
1031     if ((cred->flags & CRED_FLAG_INITIATE) == 0) {
1032         major = GSS_S_NO_CRED;
1033         *minor = GSSEAP_CRED_USAGE_MISMATCH;
1034         goto cleanup;
1035     }
1036
1037     major = gssEapSmStep(minor,
1038                          cred,
1039                          ctx,
1040                          target_name,
1041                          mech_type,
1042                          req_flags,
1043                          time_req,
1044                          input_chan_bindings,
1045                          input_token,
1046                          output_token,
1047                          eapGssInitiatorSm,
1048                          sizeof(eapGssInitiatorSm) / sizeof(eapGssInitiatorSm[0]));
1049     if (GSS_ERROR(major))
1050         goto cleanup;
1051
1052     if (actual_mech_type != NULL) {
1053         if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
1054             duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
1055     }
1056     if (ret_flags != NULL)
1057         *ret_flags = ctx->gssFlags;
1058     if (time_rec != NULL)
1059         gssEapContextTime(&tmpMinor, ctx, time_rec);
1060
1061     assert(CTX_IS_ESTABLISHED(ctx) || major == GSS_S_CONTINUE_NEEDED);
1062
1063 cleanup:
1064     if (cred != GSS_C_NO_CREDENTIAL)
1065         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
1066     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
1067
1068     if (GSS_ERROR(major))
1069         gssEapReleaseContext(&tmpMinor, context_handle);
1070
1071     return major;
1072 }