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 GSSEAP_UNUSED,
 165                   struct wpa_config_blob *blob GSSEAP_UNUSED)
 166 {
 167 }
 168
 169 static const struct wpa_config_blob *
 170 peerGetConfigBlob(void *ctx GSSEAP_UNUSED,
 171                   const char *name GSSEAP_UNUSED)
 172 {
 173     return NULL;
 174 }
 175
 176 static void
 177 peerNotifyPending(void *ctx GSSEAP_UNUSED)
 178 {
 179 }
 180
 181 static struct eapol_callbacks gssEapPolicyCallbacks = {
 182     peerGetConfig,
 183     peerGetBool,
 184     peerSetBool,
 185     peerGetInt,
 186     peerSetInt,
 187     peerGetEapReqData,
 188     peerSetConfigBlob,
 189     peerGetConfigBlob,
 190     peerNotifyPending,
 191 };
 192
 193 #ifdef GSSEAP_DEBUG
 194 extern int wpa_debug_level;
 195 #endif
 196
 197 static OM_uint32
 198 peerConfigInit(OM_uint32 *minor,
 199                gss_cred_id_t cred,
 200                gss_ctx_id_t ctx)
 201 {
 202     OM_uint32 major;
 203     krb5_context krbContext;
 204     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 205     gss_buffer_desc identity = GSS_C_EMPTY_BUFFER;
 206     gss_buffer_desc realm = GSS_C_EMPTY_BUFFER;
 207
 208     eapPeerConfig->identity = NULL;
 209     eapPeerConfig->identity_len = 0;
 210     eapPeerConfig->anonymous_identity = NULL;
 211     eapPeerConfig->anonymous_identity_len = 0;
 212     eapPeerConfig->password = NULL;
 213     eapPeerConfig->password_len = 0;
 214
 215     assert(cred != GSS_C_NO_CREDENTIAL);
 216
 217     GSSEAP_KRB_INIT(&krbContext);
 218
 219     eapPeerConfig->fragment_size = 1024;
 220 #ifdef GSSEAP_DEBUG
 221     wpa_debug_level = 0;
 222 #endif
 223
 224     assert(cred->name != GSS_C_NO_NAME);
 225
 226     if ((cred->name->flags & (NAME_FLAG_NAI | NAME_FLAG_SERVICE)) == 0) {
 227         *minor = GSSEAP_BAD_INITIATOR_NAME;
 228         return GSS_S_BAD_NAME;
 229     }
 230
 231     /* identity */
 232     major = gssEapDisplayName(minor, cred->name, &identity, NULL);
 233     if (GSS_ERROR(major))
 234         return major;
 235
 236     eapPeerConfig->identity = (unsigned char *)identity.value;
 237     eapPeerConfig->identity_len = identity.length;
 238
 239     krbPrincRealmToGssBuffer(cred->name->krbPrincipal, &realm);
 240
 241     /* anonymous_identity */
 242     eapPeerConfig->anonymous_identity = GSSEAP_MALLOC(realm.length + 2);
 243     if (eapPeerConfig->anonymous_identity == NULL) {
 244         *minor = ENOMEM;
 245         return GSS_S_FAILURE;
 246     }
 247
 248     eapPeerConfig->anonymous_identity[0] = '@';
 249     memcpy(eapPeerConfig->anonymous_identity + 1, realm.value, realm.length);
 250     eapPeerConfig->anonymous_identity[1 + realm.length] = '\0';
 251     eapPeerConfig->anonymous_identity_len = 1 + realm.length;
 252
 253     /* password */
 254     eapPeerConfig->password = (unsigned char *)cred->password.value;
 255     eapPeerConfig->password_len = cred->password.length;
 256
 257     *minor = 0;
 258     return GSS_S_COMPLETE;
 259 }
 260
 261 static OM_uint32
 262 peerConfigFree(OM_uint32 *minor,
 263                gss_ctx_id_t ctx)
 264 {
 265     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 266
 267     if (eapPeerConfig->identity != NULL) {
 268         GSSEAP_FREE(eapPeerConfig->identity);
 269         eapPeerConfig->identity = NULL;
 270         eapPeerConfig->identity_len = 0;
 271     }
 272
 273     if (eapPeerConfig->anonymous_identity != NULL) {
 274         GSSEAP_FREE(eapPeerConfig->anonymous_identity);
 275         eapPeerConfig->anonymous_identity = NULL;
 276         eapPeerConfig->anonymous_identity_len = 0;
 277     }
 278
 279     *minor = 0;
 280     return GSS_S_COMPLETE;
 281 }
 282
 283 /*
 284  * Mark an initiator context as ready for cryptographic operations
 285  */
 286 static OM_uint32
 287 initReady(OM_uint32 *minor, gss_ctx_id_t ctx, OM_uint32 reqFlags)
 288 {
 289     OM_uint32 major;
 290     const unsigned char *key;
 291     size_t keyLength;
 292
 293 #if 1
 294     /* XXX actually check for mutual auth */
 295     if (reqFlags & GSS_C_MUTUAL_FLAG)
 296         ctx->gssFlags |= GSS_C_MUTUAL_FLAG;
 297 #endif
 298
 299     /* Cache encryption type derived from selected mechanism OID */
 300     major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &ctx->encryptionType);
 301     if (GSS_ERROR(major))
 302         return major;
 303
 304     if (!eap_key_available(ctx->initiatorCtx.eap)) {
 305         *minor = GSSEAP_KEY_UNAVAILABLE;
 306         return GSS_S_UNAVAILABLE;
 307     }
 308
 309     key = eap_get_eapKeyData(ctx->initiatorCtx.eap, &keyLength);
 310
 311     if (keyLength < EAP_EMSK_LEN) {
 312         *minor = GSSEAP_KEY_TOO_SHORT;
 313         return GSS_S_UNAVAILABLE;
 314     }
 315
 316     major = gssEapDeriveRfc3961Key(minor,
 317                                    &key[EAP_EMSK_LEN / 2],
 318                                    EAP_EMSK_LEN / 2,
 319                                    ctx->encryptionType,
 320                                    &ctx->rfc3961Key);
 321        if (GSS_ERROR(major))
 322            return major;
 323
 324     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 325                                       &ctx->checksumType);
 326     if (GSS_ERROR(major))
 327         return major;
 328
 329     major = sequenceInit(minor,
 330                          &ctx->seqState,
 331                          ctx->recvSeq,
 332                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 333                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 334                          TRUE);
 335     if (GSS_ERROR(major))
 336         return major;
 337
 338     *minor = 0;
 339     return GSS_S_COMPLETE;
 340 }
 341
 342 static OM_uint32
 343 initBegin(OM_uint32 *minor,
 344           gss_cred_id_t cred,
 345           gss_ctx_id_t ctx,
 346           gss_name_t target,
 347           gss_OID mech,
 348           OM_uint32 reqFlags GSSEAP_UNUSED,
 349           OM_uint32 timeReq,
 350           gss_channel_bindings_t chanBindings GSSEAP_UNUSED)
 351 {
 352     OM_uint32 major;
 353
 354     assert(cred != GSS_C_NO_CREDENTIAL);
 355
 356     if (cred->expiryTime)
 357         ctx->expiryTime = cred->expiryTime;
 358     else if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
 359         ctx->expiryTime = 0;
 360     else
 361         ctx->expiryTime = time(NULL) + timeReq;
 362
 363     /*
 364      * The credential mutex protects its name, however we need to
 365      * explicitly lock the acceptor name (unlikely as it may be
 366      * that it has attributes set on it).
 367      */
 368     major = gssEapDuplicateName(minor, cred->name, &ctx->initiatorName);
 369     if (GSS_ERROR(major))
 370         return major;
 371
 372     if (target != GSS_C_NO_NAME) {
 373         GSSEAP_MUTEX_LOCK(&target->mutex);
 374
 375         major = gssEapDuplicateName(minor, target, &ctx->acceptorName);
 376         if (GSS_ERROR(major)) {
 377             GSSEAP_MUTEX_UNLOCK(&target->mutex);
 378             return major;
 379         }
 380
 381         GSSEAP_MUTEX_UNLOCK(&target->mutex);
 382     }
 383
 384     major = gssEapCanonicalizeOid(minor,
 385                                   mech,
 386                                   OID_FLAG_NULL_VALID | OID_FLAG_MAP_NULL_TO_DEFAULT_MECH,
 387                                   &ctx->mechanismUsed);
 388     if (GSS_ERROR(major))
 389         return major;
 390
 391     /* If credentials were provided, check they're usable with this mech */
 392     if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
 393         *minor = GSSEAP_CRED_MECH_MISMATCH;
 394         return GSS_S_BAD_MECH;
 395     }
 396
 397     *minor = 0;
 398     return GSS_S_COMPLETE;
 399 }
 400
 401 static OM_uint32
 402 eapGssSmInitError(OM_uint32 *minor,
 403                   gss_cred_id_t cred GSSEAP_UNUSED,
 404                   gss_ctx_id_t ctx GSSEAP_UNUSED,
 405                   gss_name_t target GSSEAP_UNUSED,
 406                   gss_OID mech GSSEAP_UNUSED,
 407                   OM_uint32 reqFlags GSSEAP_UNUSED,
 408                   OM_uint32 timeReq GSSEAP_UNUSED,
 409                   gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 410                   gss_buffer_t inputToken,
 411                   gss_buffer_t outputToken GSSEAP_UNUSED,
 412                   OM_uint32 *smFlags GSSEAP_UNUSED)
 413 {
 414     OM_uint32 major;
 415     unsigned char *p;
 416
 417     if (inputToken->length < 8) {
 418         *minor = GSSEAP_TOK_TRUNC;
 419         return GSS_S_DEFECTIVE_TOKEN;
 420     }
 421
 422     p = (unsigned char *)inputToken->value;
 423
 424     major = load_uint32_be(&p[0]);
 425     *minor = ERROR_TABLE_BASE_eapg + load_uint32_be(&p[4]);
 426
 427     if (!GSS_ERROR(major) || !IS_WIRE_ERROR(*minor)) {
 428         major = GSS_S_FAILURE;
 429         *minor = GSSEAP_BAD_ERROR_TOKEN;
 430     }
 431
 432     assert(GSS_ERROR(major));
 433
 434     return major;
 435 }
 436
 437 #ifdef GSSEAP_ENABLE_REAUTH
 438 static OM_uint32
 439 eapGssSmInitGssReauth(OM_uint32 *minor,
 440                       gss_cred_id_t cred,
 441                       gss_ctx_id_t ctx,
 442                       gss_name_t target,
 443                       gss_OID mech GSSEAP_UNUSED,
 444                       OM_uint32 reqFlags,
 445                       OM_uint32 timeReq,
 446                       gss_channel_bindings_t chanBindings,
 447                       gss_buffer_t inputToken,
 448                       gss_buffer_t outputToken,
 449                       OM_uint32 *smFlags GSSEAP_UNUSED)
 450 {
 451     OM_uint32 major, tmpMinor;
 452     gss_name_t mechTarget = GSS_C_NO_NAME;
 453     gss_OID actualMech = GSS_C_NO_OID;
 454     OM_uint32 gssFlags, timeRec;
 455
 456     assert(cred != GSS_C_NO_CREDENTIAL);
 457
 458     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL) {
 459         if (!gssEapCanReauthP(cred, target, timeReq))
 460             return GSS_S_CONTINUE_NEEDED;
 461
 462         ctx->flags |= CTX_FLAG_KRB_REAUTH;
 463     } else if ((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0) {
 464         major = GSS_S_DEFECTIVE_TOKEN;
 465         *minor = GSSEAP_WRONG_ITOK;
 466         goto cleanup;
 467     }
 468
 469     major = gssEapMechToGlueName(minor, target, &mechTarget);
 470     if (GSS_ERROR(major))
 471         goto cleanup;
 472
 473     major = gssInitSecContext(minor,
 474                               cred->krbCred,
 475                               &ctx->reauthCtx,
 476                               mechTarget,
 477                               (gss_OID)gss_mech_krb5,
 478                               reqFlags | GSS_C_MUTUAL_FLAG,
 479                               timeReq,
 480                               chanBindings,
 481                               inputToken,
 482                               &actualMech,
 483                               outputToken,
 484                               &gssFlags,
 485                               &timeRec);
 486     if (GSS_ERROR(major))
 487         goto cleanup;
 488
 489     ctx->gssFlags = gssFlags;
 490
 491     if (major == GSS_S_COMPLETE) {
 492         assert(GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_REAUTHENTICATE);
 493
 494         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 495         if (GSS_ERROR(major))
 496             goto cleanup;
 497         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 498     } else {
 499         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_REAUTHENTICATE);
 500     }
 501
 502 cleanup:
 503     gssReleaseName(&tmpMinor, &mechTarget);
 504
 505     return major;
 506 }
 507 #endif /* GSSEAP_ENABLE_REAUTH */
 508
 509 #ifdef GSSEAP_DEBUG
 510 static OM_uint32
 511 eapGssSmInitVendorInfo(OM_uint32 *minor,
 512                        gss_cred_id_t cred GSSEAP_UNUSED,
 513                        gss_ctx_id_t ctx GSSEAP_UNUSED,
 514                        gss_name_t target GSSEAP_UNUSED,
 515                        gss_OID mech GSSEAP_UNUSED,
 516                        OM_uint32 reqFlags GSSEAP_UNUSED,
 517                        OM_uint32 timeReq GSSEAP_UNUSED,
 518                        gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 519                        gss_buffer_t inputToken GSSEAP_UNUSED,
 520                        gss_buffer_t outputToken,
 521                        OM_uint32 *smFlags GSSEAP_UNUSED)
 522 {
 523     OM_uint32 major;
 524
 525     major = makeStringBuffer(minor, "JANET(UK)", outputToken);
 526     if (GSS_ERROR(major))
 527         return major;
 528
 529     return GSS_S_CONTINUE_NEEDED;
 530 }
 531 #endif
 532
 533 static OM_uint32
 534 eapGssSmInitAcceptorName(OM_uint32 *minor,
 535                          gss_cred_id_t cred GSSEAP_UNUSED,
 536                          gss_ctx_id_t ctx,
 537                          gss_name_t target GSSEAP_UNUSED,
 538                          gss_OID mech GSSEAP_UNUSED,
 539                          OM_uint32 reqFlags GSSEAP_UNUSED,
 540                          OM_uint32 timeReq GSSEAP_UNUSED,
 541                          gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 542                          gss_buffer_t inputToken GSSEAP_UNUSED,
 543                          gss_buffer_t outputToken,
 544                          OM_uint32 *smFlags GSSEAP_UNUSED)
 545 {
 546     OM_uint32 major;
 547
 548     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL &&
 549         ctx->acceptorName != GSS_C_NO_NAME) {
 550
 551         /* Send desired target name to acceptor */
 552         major = gssEapDisplayName(minor, ctx->acceptorName,
 553                                   outputToken, NULL);
 554         if (GSS_ERROR(major))
 555             return major;
 556     } else if (inputToken != GSS_C_NO_BUFFER &&
 557                ctx->acceptorName == GSS_C_NO_NAME) {
 558         /* Accept target name hint from acceptor */
 559         major = gssEapImportName(minor, inputToken,
 560                                  GSS_C_NT_USER_NAME,
 561                                  ctx->mechanismUsed,
 562                                  &ctx->acceptorName);
 563         if (GSS_ERROR(major))
 564             return major;
 565     }
 566
 567     /*
 568      * Currently, other parts of the code assume that the acceptor name
 569      * is available, hence this check.
 570      */
 571     if (ctx->acceptorName == GSS_C_NO_NAME) {
 572         *minor = GSSEAP_NO_ACCEPTOR_NAME;
 573         return GSS_S_FAILURE;
 574     }
 575
 576     return GSS_S_CONTINUE_NEEDED;
 577 }
 578
 579 static OM_uint32
 580 eapGssSmInitIdentity(OM_uint32 *minor,
 581                      gss_cred_id_t cred GSSEAP_UNUSED,
 582                      gss_ctx_id_t ctx,
 583                      gss_name_t target GSSEAP_UNUSED,
 584                      gss_OID mech GSSEAP_UNUSED,
 585                      OM_uint32 reqFlags GSSEAP_UNUSED,
 586                      OM_uint32 timeReq GSSEAP_UNUSED,
 587                      gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 588                      gss_buffer_t inputToken GSSEAP_UNUSED,
 589                      gss_buffer_t outputToken GSSEAP_UNUSED,
 590                      OM_uint32 *smFlags)
 591 {
 592     struct eap_config eapConfig;
 593
 594 #ifdef GSSEAP_ENABLE_REAUTH
 595     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_REAUTHENTICATE) {
 596         OM_uint32 tmpMinor;
 597
 598         /* server didn't support reauthentication, sent EAP request */
 599         gssDeleteSecContext(&tmpMinor, &ctx->reauthCtx, GSS_C_NO_BUFFER);
 600         ctx->flags &= ~(CTX_FLAG_KRB_REAUTH);
 601         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_INITIAL);
 602     } else
 603 #endif
 604         *smFlags |= SM_FLAG_FORCE_SEND_TOKEN;
 605
 606     assert((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0);
 607     assert(inputToken == GSS_C_NO_BUFFER);
 608
 609     memset(&eapConfig, 0, sizeof(eapConfig));
 610
 611     ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 612                                              &gssEapPolicyCallbacks,
 613                                              ctx,
 614                                              &eapConfig);
 615     if (ctx->initiatorCtx.eap == NULL) {
 616         *minor = GSSEAP_PEER_SM_INIT_FAILURE;
 617         return GSS_S_FAILURE;
 618     }
 619
 620     ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 621
 622     /* poke EAP state machine */
 623     if (eap_peer_sm_step(ctx->initiatorCtx.eap) != 0) {
 624         *minor = GSSEAP_PEER_SM_STEP_FAILURE;
 625         return GSS_S_FAILURE;
 626     }
 627
 628     GSSEAP_SM_TRANSITION_NEXT(ctx);
 629
 630     *minor = 0;
 631
 632     return GSS_S_CONTINUE_NEEDED;
 633 }
 634
 635 static OM_uint32
 636 eapGssSmInitAuthenticate(OM_uint32 *minor,
 637                          gss_cred_id_t cred,
 638                          gss_ctx_id_t ctx,
 639                          gss_name_t target GSSEAP_UNUSED,
 640                          gss_OID mech GSSEAP_UNUSED,
 641                          OM_uint32 reqFlags GSSEAP_UNUSED,
 642                          OM_uint32 timeReq GSSEAP_UNUSED,
 643                          gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 644                          gss_buffer_t inputToken GSSEAP_UNUSED,
 645                          gss_buffer_t outputToken,
 646                          OM_uint32 *smFlags)
 647 {
 648     OM_uint32 major;
 649     OM_uint32 tmpMinor;
 650     int code;
 651     struct wpabuf *resp = NULL;
 652
 653     *minor = 0;
 654
 655     assert(inputToken != GSS_C_NO_BUFFER);
 656
 657     major = peerConfigInit(minor, cred, ctx);
 658     if (GSS_ERROR(major))
 659         goto cleanup;
 660
 661     assert(ctx->initiatorCtx.eap != NULL);
 662     assert(ctx->flags & CTX_FLAG_EAP_PORT_ENABLED);
 663
 664     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 665
 666     wpabuf_set(&ctx->initiatorCtx.reqData,
 667                inputToken->value, inputToken->length);
 668
 669     major = GSS_S_CONTINUE_NEEDED;
 670
 671     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 672     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 673         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 674
 675         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 676     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 677         major = initReady(minor, ctx, reqFlags);
 678         if (GSS_ERROR(major))
 679             goto cleanup;
 680
 681         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 682         major = GSS_S_CONTINUE_NEEDED;
 683         GSSEAP_SM_TRANSITION_NEXT(ctx);
 684     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 685         major = GSS_S_DEFECTIVE_CREDENTIAL;
 686         *minor = GSSEAP_PEER_AUTH_FAILURE;
 687     } else {
 688         major = GSS_S_DEFECTIVE_TOKEN;
 689         *minor = GSSEAP_PEER_BAD_MESSAGE;
 690     }
 691
 692 cleanup:
 693     if (resp != NULL) {
 694         OM_uint32 tmpMajor;
 695         gss_buffer_desc respBuf;
 696
 697         assert(major == GSS_S_CONTINUE_NEEDED);
 698
 699         respBuf.length = wpabuf_len(resp);
 700         respBuf.value = (void *)wpabuf_head(resp);
 701
 702         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 703         if (GSS_ERROR(tmpMajor)) {
 704             major = tmpMajor;
 705             *minor = tmpMinor;
 706         }
 707
 708         *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 709     }
 710
 711     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 712     peerConfigFree(&tmpMinor, ctx);
 713
 714     return major;
 715 }
 716
 717 static OM_uint32
 718 eapGssSmInitGssChannelBindings(OM_uint32 *minor,
 719                                gss_cred_id_t cred GSSEAP_UNUSED,
 720                                gss_ctx_id_t ctx,
 721                                gss_name_t target GSSEAP_UNUSED,
 722                                gss_OID mech GSSEAP_UNUSED,
 723                                OM_uint32 reqFlags GSSEAP_UNUSED,
 724                                OM_uint32 timeReq GSSEAP_UNUSED,
 725                                gss_channel_bindings_t chanBindings,
 726                                gss_buffer_t inputToken GSSEAP_UNUSED,
 727                                gss_buffer_t outputToken,
 728                                OM_uint32 *smFlags)
 729 {
 730     OM_uint32 major;
 731     gss_buffer_desc buffer = GSS_C_EMPTY_BUFFER;
 732
 733     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
 734         buffer = chanBindings->application_data;
 735
 736     major = gssEapWrap(minor, ctx, TRUE, GSS_C_QOP_DEFAULT,
 737                        &buffer, NULL, outputToken);
 738     if (GSS_ERROR(major))
 739         return major;
 740
 741     assert(outputToken->value != NULL);
 742
 743     *minor = 0;
 744     *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 745
 746     return GSS_S_CONTINUE_NEEDED;
 747 }
 748
 749 #ifdef GSSEAP_ENABLE_REAUTH
 750 static OM_uint32
 751 eapGssSmInitReauthCreds(OM_uint32 *minor,
 752                         gss_cred_id_t cred,
 753                         gss_ctx_id_t ctx,
 754                         gss_name_t target GSSEAP_UNUSED,
 755                         gss_OID mech GSSEAP_UNUSED,
 756                         OM_uint32 reqFlags GSSEAP_UNUSED,
 757                         OM_uint32 timeReq GSSEAP_UNUSED,
 758                         gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 759                         gss_buffer_t inputToken,
 760                         gss_buffer_t outputToken GSSEAP_UNUSED,
 761                         OM_uint32 *smFlags GSSEAP_UNUSED)
 762 {
 763     OM_uint32 major;
 764
 765     if (ctx->gssFlags & GSS_C_MUTUAL_FLAG) {
 766         major = gssEapStoreReauthCreds(minor, ctx, cred, inputToken);
 767         if (GSS_ERROR(major))
 768             return major;
 769     }
 770
 771     *minor = 0;
 772     return GSS_S_CONTINUE_NEEDED;
 773 }
 774 #endif /* GSSEAP_ENABLE_REAUTH */
 775
 776 static OM_uint32
 777 eapGssSmInitCompleteInitiatorExts(OM_uint32 *minor,
 778                                   gss_cred_id_t cred GSSEAP_UNUSED,
 779                                   gss_ctx_id_t ctx,
 780                                   gss_name_t target GSSEAP_UNUSED,
 781                                   gss_OID mech GSSEAP_UNUSED,
 782                                   OM_uint32 reqFlags GSSEAP_UNUSED,
 783                                   OM_uint32 timeReq GSSEAP_UNUSED,
 784                                   gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 785                                   gss_buffer_t inputToken GSSEAP_UNUSED,
 786                                   gss_buffer_t outputToken GSSEAP_UNUSED,
 787                                   OM_uint32 *smFlags)
 788 {
 789     GSSEAP_SM_TRANSITION_NEXT(ctx);
 790
 791     *minor = 0;
 792     *smFlags |= SM_FLAG_FORCE_SEND_TOKEN;
 793
 794     return GSS_S_CONTINUE_NEEDED;
 795 }
 796
 797 static OM_uint32
 798 eapGssSmInitCompleteAcceptorExts(OM_uint32 *minor,
 799                                  gss_cred_id_t cred GSSEAP_UNUSED,
 800                                  gss_ctx_id_t ctx,
 801                                  gss_name_t target GSSEAP_UNUSED,
 802                                  gss_OID mech GSSEAP_UNUSED,
 803                                  OM_uint32 reqFlags GSSEAP_UNUSED,
 804                                  OM_uint32 timeReq GSSEAP_UNUSED,
 805                                  gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 806                                  gss_buffer_t inputToken GSSEAP_UNUSED,
 807                                  gss_buffer_t outputToken GSSEAP_UNUSED,
 808                                  OM_uint32 *smFlags GSSEAP_UNUSED)
 809 {
 810     GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 811
 812     *minor = 0;
 813
 814     return GSS_S_COMPLETE;
 815 }
 816
 817 static struct gss_eap_sm eapGssInitiatorSm[] = {
 818     {
 819         ITOK_TYPE_CONTEXT_ERR,
 820         ITOK_TYPE_NONE,
 821         GSSEAP_STATE_ALL & ~(GSSEAP_STATE_INITIAL),
 822         0,
 823         eapGssSmInitError
 824     },
 825     {
 826         ITOK_TYPE_ACCEPTOR_NAME_RESP,
 827         ITOK_TYPE_ACCEPTOR_NAME_REQ,
 828         GSSEAP_STATE_INITIAL | GSSEAP_STATE_AUTHENTICATE,
 829         0,
 830         eapGssSmInitAcceptorName
 831     },
 832 #ifdef GSSEAP_DEBUG
 833     {
 834         ITOK_TYPE_NONE,
 835         ITOK_TYPE_VENDOR_INFO,
 836         GSSEAP_STATE_INITIAL,
 837         0,
 838         eapGssSmInitVendorInfo
 839     },
 840 #endif
 841 #ifdef GSSEAP_ENABLE_REAUTH
 842     {
 843         ITOK_TYPE_REAUTH_RESP,
 844         ITOK_TYPE_REAUTH_REQ,
 845         GSSEAP_STATE_INITIAL | GSSEAP_STATE_REAUTHENTICATE,
 846         0,
 847         eapGssSmInitGssReauth
 848     },
 849 #endif
 850     {
 851         ITOK_TYPE_NONE,
 852         ITOK_TYPE_NONE,
 853 #ifdef GSSEAP_ENABLE_REAUTH
 854         GSSEAP_STATE_REAUTHENTICATE |
 855 #endif
 856         GSSEAP_STATE_INITIAL,
 857         SM_ITOK_FLAG_REQUIRED,
 858         eapGssSmInitIdentity
 859     },
 860     {
 861         ITOK_TYPE_EAP_REQ,
 862         ITOK_TYPE_EAP_RESP,
 863         GSSEAP_STATE_AUTHENTICATE,
 864         SM_ITOK_FLAG_REQUIRED,
 865         eapGssSmInitAuthenticate
 866     },
 867     {
 868         ITOK_TYPE_NONE,
 869         ITOK_TYPE_GSS_CHANNEL_BINDINGS,
 870         GSSEAP_STATE_INITIATOR_EXTS,
 871         SM_ITOK_FLAG_REQUIRED,
 872         eapGssSmInitGssChannelBindings
 873     },
 874     {
 875         ITOK_TYPE_NONE,
 876         ITOK_TYPE_NONE,
 877         GSSEAP_STATE_INITIATOR_EXTS,
 878         0,
 879         eapGssSmInitCompleteInitiatorExts
 880     },
 881 #ifdef GSSEAP_ENABLE_REAUTH
 882     {
 883         ITOK_TYPE_REAUTH_CREDS,
 884         ITOK_TYPE_NONE,
 885         GSSEAP_STATE_ACCEPTOR_EXTS,
 886         0,
 887         eapGssSmInitReauthCreds
 888     },
 889 #endif
 890     /* other extensions go here */
 891     {
 892         ITOK_TYPE_NONE,
 893         ITOK_TYPE_NONE,
 894         GSSEAP_STATE_ACCEPTOR_EXTS,
 895         0,
 896         eapGssSmInitCompleteAcceptorExts
 897     }
 898 };
 899
 900 OM_uint32
 901 gss_init_sec_context(OM_uint32 *minor,
 902                      gss_cred_id_t cred,
 903                      gss_ctx_id_t *context_handle,
 904                      gss_name_t target_name,
 905                      gss_OID mech_type,
 906                      OM_uint32 req_flags,
 907                      OM_uint32 time_req,
 908                      gss_channel_bindings_t input_chan_bindings,
 909                      gss_buffer_t input_token,
 910                      gss_OID *actual_mech_type,
 911                      gss_buffer_t output_token,
 912                      OM_uint32 *ret_flags,
 913                      OM_uint32 *time_rec)
 914 {
 915     OM_uint32 major, tmpMinor;
 916     gss_ctx_id_t ctx = *context_handle;
 917     int initialContextToken = 0;
 918
 919     *minor = 0;
 920
 921     output_token->length = 0;
 922     output_token->value = NULL;
 923
 924     if (ctx == GSS_C_NO_CONTEXT) {
 925         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 926             *minor = GSSEAP_WRONG_SIZE;
 927             return GSS_S_DEFECTIVE_TOKEN;
 928         }
 929
 930         major = gssEapAllocContext(minor, &ctx);
 931         if (GSS_ERROR(major))
 932             return major;
 933
 934         ctx->flags |= CTX_FLAG_INITIATOR;
 935         initialContextToken = 1;
 936
 937         *context_handle = ctx;
 938     }
 939
 940     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 941
 942     if (cred == GSS_C_NO_CREDENTIAL) {
 943         if (ctx->defaultCred == GSS_C_NO_CREDENTIAL) {
 944             major = gssEapAcquireCred(minor,
 945                                       GSS_C_NO_NAME,
 946                                       GSS_C_NO_BUFFER,
 947                                       time_req,
 948                                       GSS_C_NO_OID_SET,
 949                                       GSS_C_INITIATE,
 950                                       &ctx->defaultCred,
 951                                       NULL,
 952                                       NULL);
 953             if (GSS_ERROR(major))
 954                 goto cleanup;
 955         }
 956
 957         cred = ctx->defaultCred;
 958     }
 959
 960     GSSEAP_MUTEX_LOCK(&cred->mutex);
 961
 962     if ((cred->flags & CRED_FLAG_INITIATE) == 0) {
 963         major = GSS_S_NO_CRED;
 964         *minor = GSSEAP_CRED_USAGE_MISMATCH;
 965         goto cleanup;
 966     }
 967
 968     if (initialContextToken) {
 969         major = initBegin(minor, cred, ctx, target_name, mech_type,
 970                           req_flags, time_req, input_chan_bindings);
 971         if (GSS_ERROR(major))
 972             goto cleanup;
 973     }
 974
 975     major = gssEapSmStep(minor,
 976                          cred,
 977                          ctx,
 978                          target_name,
 979                          mech_type,
 980                          req_flags,
 981                          time_req,
 982                          input_chan_bindings,
 983                          input_token,
 984                          output_token,
 985                          eapGssInitiatorSm,
 986                          sizeof(eapGssInitiatorSm) / sizeof(eapGssInitiatorSm[0]));
 987     if (GSS_ERROR(major))
 988         goto cleanup;
 989
 990     if (actual_mech_type != NULL) {
 991         OM_uint32 tmpMajor;
 992
 993         tmpMajor = gssEapCanonicalizeOid(&tmpMinor, ctx->mechanismUsed, 0, actual_mech_type);
 994         if (GSS_ERROR(tmpMajor)) {
 995             major = tmpMajor;
 996             *minor = tmpMinor;
 997             goto cleanup;
 998         }
 999     }
1000     if (ret_flags != NULL)
1001         *ret_flags = ctx->gssFlags;
1002     if (time_rec != NULL)
1003         gssEapContextTime(&tmpMinor, ctx, time_rec);
1004
1005     assert(CTX_IS_ESTABLISHED(ctx) || major == GSS_S_CONTINUE_NEEDED);
1006
1007 cleanup:
1008     if (cred != GSS_C_NO_CREDENTIAL)
1009         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
1010     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
1011
1012     if (GSS_ERROR(major))
1013         gssEapReleaseContext(&tmpMinor, context_handle);
1014
1015     return major;
1016 }