www.project-moonshot.org Git - mech_eap.orig/blob - 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           gss_buffer_t inputToken)
 331 {
 332     OM_uint32 major;
 333
 334     assert(cred != GSS_C_NO_CREDENTIAL);
 335
 336     if (cred->expiryTime)
 337         ctx->expiryTime = cred->expiryTime;
 338     else if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
 339         ctx->expiryTime = 0;
 340     else
 341         ctx->expiryTime = time(NULL) + timeReq;
 342
 343     /*
 344      * The credential mutex protects its name, however we need to
 345      * explicitly lock the acceptor name (unlikely as it may be
 346      * that it has attributes set on it).
 347      */
 348     major = gssEapDuplicateName(minor, cred->name, &ctx->initiatorName);
 349     if (GSS_ERROR(major))
 350         return major;
 351
 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     if (mech == GSS_C_NULL_OID) {
 363         major = gssEapDefaultMech(minor, &ctx->mechanismUsed);
 364     } else if (gssEapIsConcreteMechanismOid(mech)) {
 365         if (!gssEapInternalizeOid(mech, &ctx->mechanismUsed))
 366             major = duplicateOid(minor, mech, &ctx->mechanismUsed);
 367     } else {
 368         major = GSS_S_BAD_MECH;
 369         *minor = GSSEAP_WRONG_MECH;
 370     }
 371     if (GSS_ERROR(major))
 372         return major;
 373
 374     /* If credentials were provided, check they're usable with this mech */
 375     if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
 376         *minor = GSSEAP_CRED_MECH_MISMATCH;
 377         return GSS_S_BAD_MECH;
 378     }
 379
 380     *minor = 0;
 381     return GSS_S_COMPLETE;
 382 }
 383
 384 static OM_uint32
 385 eapGssSmInitError(OM_uint32 *minor,
 386                   gss_cred_id_t cred,
 387                   gss_ctx_id_t ctx,
 388                   gss_name_t target,
 389                   gss_OID mech,
 390                   OM_uint32 reqFlags,
 391                   OM_uint32 timeReq,
 392                   gss_channel_bindings_t chanBindings,
 393                   gss_buffer_t inputToken,
 394                   gss_buffer_t outputToken,
 395                   OM_uint32 *smFlags)
 396 {
 397     OM_uint32 major;
 398     unsigned char *p;
 399
 400     if (inputToken->length < 8) {
 401         *minor = GSSEAP_TOK_TRUNC;
 402         return GSS_S_DEFECTIVE_TOKEN;
 403     }
 404
 405     p = (unsigned char *)inputToken->value;
 406
 407     major = load_uint32_be(&p[0]);
 408     *minor = ERROR_TABLE_BASE_eapg + load_uint32_be(&p[4]);
 409
 410     if (!GSS_ERROR(major) || !IS_WIRE_ERROR(*minor)) {
 411         major = GSS_S_FAILURE;
 412         *minor = GSSEAP_BAD_ERROR_TOKEN;
 413     }
 414
 415     assert(GSS_ERROR(major));
 416
 417     return major;
 418 }
 419
 420 #ifdef GSSEAP_ENABLE_REAUTH
 421 static OM_uint32
 422 eapGssSmInitGssReauth(OM_uint32 *minor,
 423                       gss_cred_id_t cred,
 424                       gss_ctx_id_t ctx,
 425                       gss_name_t target,
 426                       gss_OID mech,
 427                       OM_uint32 reqFlags,
 428                       OM_uint32 timeReq,
 429                       gss_channel_bindings_t chanBindings,
 430                       gss_buffer_t inputToken,
 431                       gss_buffer_t outputToken,
 432                       OM_uint32 *smFlags)
 433 {
 434     OM_uint32 major, tmpMinor;
 435     gss_name_t mechTarget = GSS_C_NO_NAME;
 436     gss_OID actualMech = GSS_C_NO_OID;
 437     OM_uint32 gssFlags, timeRec;
 438
 439     assert(cred != GSS_C_NO_CREDENTIAL);
 440
 441     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIAL) {
 442         if (!gssEapCanReauthP(cred, target, timeReq))
 443             return GSS_S_CONTINUE_NEEDED;
 444
 445         major = initBegin(minor, cred, ctx, target, mech,
 446                           reqFlags, timeReq, chanBindings,
 447                           inputToken);
 448         if (GSS_ERROR(major))
 449             goto cleanup;
 450
 451         ctx->flags |= CTX_FLAG_KRB_REAUTH;
 452     } else if ((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0) {
 453         major = GSS_S_DEFECTIVE_TOKEN;
 454         *minor = GSSEAP_WRONG_ITOK;
 455         goto cleanup;
 456     }
 457
 458     major = gssEapMechToGlueName(minor, target, &mechTarget);
 459     if (GSS_ERROR(major))
 460         goto cleanup;
 461
 462     major = gssInitSecContext(minor,
 463                               cred->krbCred,
 464                               &ctx->kerberosCtx,
 465                               mechTarget,
 466                               (gss_OID)gss_mech_krb5,
 467                               reqFlags,
 468                               timeReq,
 469                               chanBindings,
 470                               inputToken,
 471                               &actualMech,
 472                               outputToken,
 473                               &gssFlags,
 474                               &timeRec);
 475     if (GSS_ERROR(major))
 476         goto cleanup;
 477
 478     ctx->gssFlags = gssFlags;
 479
 480     if (major == GSS_S_COMPLETE) {
 481         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 482         if (GSS_ERROR(major))
 483             goto cleanup;
 484         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 485     } else {
 486         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_REAUTHENTICATE);
 487     }
 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 eapGssSmInitIdentity(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     struct eap_config eapConfig;
 535
 536     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_REAUTHENTICATE) {
 537         /* server didn't support reauthentication, sent EAP request */
 538         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_INITIAL);
 539         ctx->flags &= ~(CTX_FLAG_KRB_REAUTH);
 540         *smFlags |= SM_FLAG_RESTART;
 541     } else {
 542         *smFlags |= SM_FLAG_FORCE_SEND_TOKEN;
 543     }
 544
 545     assert((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0);
 546     assert(inputToken == GSS_C_NO_BUFFER);
 547
 548     major = initBegin(minor, cred, ctx, target, mech,
 549                       reqFlags, timeReq, chanBindings,
 550                       inputToken);
 551     if (GSS_ERROR(major))
 552         return major;
 553
 554     memset(&eapConfig, 0, sizeof(eapConfig));
 555
 556     ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 557                                              &gssEapPolicyCallbacks,
 558                                              ctx,
 559                                              &eapConfig);
 560     if (ctx->initiatorCtx.eap == NULL) {
 561         *minor = GSSEAP_PEER_SM_INIT_FAILURE;
 562         return GSS_S_FAILURE;
 563     }
 564
 565     ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 566
 567     /* poke EAP state machine */
 568     if (eap_peer_sm_step(ctx->initiatorCtx.eap) != 0) {
 569         *minor = GSSEAP_PEER_SM_STEP_FAILURE;
 570         return GSS_S_FAILURE;
 571     }
 572
 573     GSSEAP_SM_TRANSITION_NEXT(ctx);
 574
 575     *minor = 0;
 576
 577     return GSS_S_CONTINUE_NEEDED;
 578 }
 579
 580 static OM_uint32
 581 eapGssSmInitAuthenticate(OM_uint32 *minor,
 582                          gss_cred_id_t cred,
 583                          gss_ctx_id_t ctx,
 584                          gss_name_t target,
 585                          gss_OID mech,
 586                          OM_uint32 reqFlags,
 587                          OM_uint32 timeReq,
 588                          gss_channel_bindings_t chanBindings,
 589                          gss_buffer_t inputToken,
 590                          gss_buffer_t outputToken,
 591                          OM_uint32 *smFlags)
 592 {
 593     OM_uint32 major;
 594     OM_uint32 tmpMinor;
 595     int code;
 596     struct wpabuf *resp = NULL;
 597
 598     *minor = 0;
 599
 600     assert(inputToken != GSS_C_NO_BUFFER);
 601
 602     major = peerConfigInit(minor, cred, ctx);
 603     if (GSS_ERROR(major))
 604         goto cleanup;
 605
 606     assert(ctx->initiatorCtx.eap != NULL);
 607     assert(ctx->flags & CTX_FLAG_EAP_PORT_ENABLED);
 608
 609     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 610
 611     wpabuf_set(&ctx->initiatorCtx.reqData,
 612                inputToken->value, inputToken->length);
 613
 614     major = GSS_S_CONTINUE_NEEDED;
 615
 616     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 617     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 618         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 619
 620         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 621     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 622         major = initReady(minor, ctx, reqFlags);
 623         if (GSS_ERROR(major))
 624             goto cleanup;
 625
 626         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 627         major = GSS_S_CONTINUE_NEEDED;
 628         GSSEAP_SM_TRANSITION_NEXT(ctx);
 629     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 630         major = GSS_S_DEFECTIVE_CREDENTIAL;
 631         *minor = GSSEAP_PEER_AUTH_FAILURE;
 632     } else {
 633         major = GSS_S_DEFECTIVE_TOKEN;
 634         *minor = GSSEAP_PEER_BAD_MESSAGE;
 635     }
 636
 637 cleanup:
 638     if (resp != NULL) {
 639         OM_uint32 tmpMajor;
 640         gss_buffer_desc respBuf;
 641
 642         assert(major == GSS_S_CONTINUE_NEEDED);
 643
 644         respBuf.length = wpabuf_len(resp);
 645         respBuf.value = (void *)wpabuf_head(resp);
 646
 647         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 648         if (GSS_ERROR(tmpMajor)) {
 649             major = tmpMajor;
 650             *minor = tmpMinor;
 651         }
 652     }
 653
 654     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 655     peerConfigFree(&tmpMinor, ctx);
 656
 657     return major;
 658 }
 659
 660 static OM_uint32
 661 eapGssSmInitGssChannelBindings(OM_uint32 *minor,
 662                                gss_cred_id_t cred,
 663                                gss_ctx_id_t ctx,
 664                                gss_name_t target,
 665                                gss_OID mech,
 666                                OM_uint32 reqFlags,
 667                                OM_uint32 timeReq,
 668                                gss_channel_bindings_t chanBindings,
 669                                gss_buffer_t inputToken,
 670                                gss_buffer_t outputToken,
 671                                OM_uint32 *smFlags)
 672 {
 673     OM_uint32 major;
 674     gss_buffer_desc buffer = GSS_C_EMPTY_BUFFER;
 675
 676     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
 677         buffer = chanBindings->application_data;
 678
 679     major = gssEapWrap(minor, ctx, TRUE, GSS_C_QOP_DEFAULT,
 680                        &buffer, NULL, outputToken);
 681     if (GSS_ERROR(major))
 682         return major;
 683
 684     assert(outputToken->value != NULL);
 685
 686     *minor = 0;
 687     return GSS_S_CONTINUE_NEEDED;
 688 }
 689
 690 #ifdef GSSEAP_ENABLE_REAUTH
 691 static OM_uint32
 692 eapGssSmInitReauthCreds(OM_uint32 *minor,
 693                         gss_cred_id_t cred,
 694                         gss_ctx_id_t ctx,
 695                         gss_name_t target,
 696                         gss_OID mech,
 697                         OM_uint32 reqFlags,
 698                         OM_uint32 timeReq,
 699                         gss_channel_bindings_t chanBindings,
 700                         gss_buffer_t inputToken,
 701                         gss_buffer_t outputToken,
 702                         OM_uint32 *smFlags)
 703 {
 704     OM_uint32 major;
 705
 706     major = gssEapStoreReauthCreds(minor, ctx, cred, inputToken);
 707     if (GSS_ERROR(major))
 708         return major;
 709
 710     *minor = 0;
 711     return GSS_S_CONTINUE_NEEDED;
 712 }
 713 #endif /* GSSEAP_ENABLE_REAUTH */
 714
 715 static OM_uint32
 716 eapGssSmInitCompleteInitiatorExts(OM_uint32 *minor,
 717                                   gss_cred_id_t cred,
 718                                   gss_ctx_id_t ctx,
 719                                   gss_name_t target,
 720                                   gss_OID mech,
 721                                   OM_uint32 reqFlags,
 722                                   OM_uint32 timeReq,
 723                                   gss_channel_bindings_t chanBindings,
 724                                   gss_buffer_t inputToken,
 725                                   gss_buffer_t outputToken,
 726                                   OM_uint32 *smFlags)
 727 {
 728     GSSEAP_SM_TRANSITION_NEXT(ctx);
 729
 730     *minor = 0;
 731     *smFlags |= SM_FLAG_FORCE_SEND_TOKEN;
 732
 733     return GSS_S_CONTINUE_NEEDED;
 734 }
 735
 736 static OM_uint32
 737 eapGssSmInitCompleteAcceptorExts(OM_uint32 *minor,
 738                                  gss_cred_id_t cred,
 739                                  gss_ctx_id_t ctx,
 740                                  gss_name_t target,
 741                                  gss_OID mech,
 742                                  OM_uint32 reqFlags,
 743                                  OM_uint32 timeReq,
 744                                  gss_channel_bindings_t chanBindings,
 745                                  gss_buffer_t inputToken,
 746                                  gss_buffer_t outputToken,
 747                                  OM_uint32 *smFlags)
 748 {
 749     GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 750
 751     *minor = 0;
 752
 753     return GSS_S_COMPLETE;
 754 }
 755
 756 static struct gss_eap_sm eapGssInitiatorSm[] = {
 757     {
 758         ITOK_TYPE_CONTEXT_ERR,
 759         ITOK_TYPE_NONE,
 760         GSSEAP_STATE_ALL & ~(GSSEAP_STATE_INITIAL),
 761         SM_ITOK_FLAG_CRITICAL,
 762         eapGssSmInitError,
 763     },
 764 #ifdef GSSEAP_DEBUG
 765     {
 766         ITOK_TYPE_NONE,
 767         ITOK_TYPE_VENDOR_INFO,
 768         GSSEAP_STATE_INITIAL,
 769         0,
 770         eapGssSmInitVendorInfo,
 771     },
 772 #endif
 773 #ifdef GSSEAP_ENABLE_REAUTH
 774     {
 775         ITOK_TYPE_REAUTH_RESP,
 776         ITOK_TYPE_REAUTH_REQ,
 777         GSSEAP_STATE_INITIAL | GSSEAP_STATE_REAUTHENTICATE,
 778         0,
 779         eapGssSmInitGssReauth,
 780     },
 781 #endif
 782     {
 783         ITOK_TYPE_NONE,
 784         ITOK_TYPE_NONE,
 785         GSSEAP_STATE_INITIAL | GSSEAP_STATE_REAUTHENTICATE,
 786         SM_ITOK_FLAG_CRITICAL | SM_ITOK_FLAG_REQUIRED,
 787         eapGssSmInitIdentity,
 788     },
 789     {
 790         ITOK_TYPE_EAP_REQ,
 791         ITOK_TYPE_EAP_RESP,
 792         GSSEAP_STATE_AUTHENTICATE,
 793         SM_ITOK_FLAG_CRITICAL | SM_ITOK_FLAG_REQUIRED,
 794         eapGssSmInitAuthenticate,
 795     },
 796     {
 797         ITOK_TYPE_NONE,
 798         ITOK_TYPE_GSS_CHANNEL_BINDINGS,
 799         GSSEAP_STATE_INITIATOR_EXTS,
 800         SM_ITOK_FLAG_CRITICAL | SM_ITOK_FLAG_REQUIRED,
 801         eapGssSmInitGssChannelBindings,
 802     },
 803     {
 804         ITOK_TYPE_NONE,
 805         ITOK_TYPE_NONE,
 806         GSSEAP_STATE_INITIATOR_EXTS,
 807         0,
 808         eapGssSmInitCompleteInitiatorExts
 809     },
 810 #ifdef GSSEAP_ENABLE_REAUTH
 811     {
 812         ITOK_TYPE_REAUTH_CREDS,
 813         ITOK_TYPE_NONE,
 814         GSSEAP_STATE_ACCEPTOR_EXTS,
 815         0,
 816         eapGssSmInitReauthCreds,
 817     },
 818 #endif
 819     /* other extensions go here */
 820     {
 821         ITOK_TYPE_NONE,
 822         ITOK_TYPE_NONE,
 823         GSSEAP_STATE_ACCEPTOR_EXTS,
 824         0,
 825         eapGssSmInitCompleteAcceptorExts
 826     }
 827 };
 828
 829 OM_uint32
 830 gss_init_sec_context(OM_uint32 *minor,
 831                      gss_cred_id_t cred,
 832                      gss_ctx_id_t *context_handle,
 833                      gss_name_t target_name,
 834                      gss_OID mech_type,
 835                      OM_uint32 req_flags,
 836                      OM_uint32 time_req,
 837                      gss_channel_bindings_t input_chan_bindings,
 838                      gss_buffer_t input_token,
 839                      gss_OID *actual_mech_type,
 840                      gss_buffer_t output_token,
 841                      OM_uint32 *ret_flags,
 842                      OM_uint32 *time_rec)
 843 {
 844     OM_uint32 major, tmpMinor;
 845     gss_ctx_id_t ctx = *context_handle;
 846
 847     *minor = 0;
 848
 849     output_token->length = 0;
 850     output_token->value = NULL;
 851
 852     if (ctx == GSS_C_NO_CONTEXT) {
 853         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 854             *minor = GSSEAP_WRONG_SIZE;
 855             return GSS_S_DEFECTIVE_TOKEN;
 856         }
 857
 858         major = gssEapAllocContext(minor, &ctx);
 859         if (GSS_ERROR(major))
 860             return major;
 861
 862         ctx->flags |= CTX_FLAG_INITIATOR;
 863
 864         *context_handle = ctx;
 865     }
 866
 867     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 868
 869     if (cred == GSS_C_NO_CREDENTIAL) {
 870         if (ctx->defaultCred == GSS_C_NO_CREDENTIAL) {
 871             major = gssEapAcquireCred(minor,
 872                                       GSS_C_NO_NAME,
 873                                       GSS_C_NO_BUFFER,
 874                                       time_req,
 875                                       GSS_C_NO_OID_SET,
 876                                       GSS_C_INITIATE,
 877                                       &ctx->defaultCred,
 878                                       NULL,
 879                                       NULL);
 880             if (GSS_ERROR(major))
 881                 goto cleanup;
 882         }
 883
 884         cred = ctx->defaultCred;
 885     }
 886
 887     GSSEAP_MUTEX_LOCK(&cred->mutex);
 888
 889
 890     if ((cred->flags & CRED_FLAG_INITIATE) == 0) {
 891         major = GSS_S_NO_CRED;
 892         *minor = GSSEAP_CRED_USAGE_MISMATCH;
 893         goto cleanup;
 894     }
 895
 896     major = gssEapSmStep(minor,
 897                          cred,
 898                          ctx,
 899                          target_name,
 900                          mech_type,
 901                          req_flags,
 902                          time_req,
 903                          input_chan_bindings,
 904                          input_token,
 905                          output_token,
 906                          eapGssInitiatorSm,
 907                          sizeof(eapGssInitiatorSm) / sizeof(eapGssInitiatorSm[0]));
 908     if (GSS_ERROR(major))
 909         goto cleanup;
 910
 911     if (actual_mech_type != NULL) {
 912         if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
 913             duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
 914     }
 915     if (ret_flags != NULL)
 916         *ret_flags = ctx->gssFlags;
 917     if (time_rec != NULL)
 918         gssEapContextTime(&tmpMinor, ctx, time_rec);
 919
 920     assert(CTX_IS_ESTABLISHED(ctx) || major == GSS_S_CONTINUE_NEEDED);
 921
 922 cleanup:
 923     if (cred != GSS_C_NO_CREDENTIAL)
 924         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
 925     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 926
 927     if (GSS_ERROR(major))
 928         gssEapReleaseContext(&tmpMinor, context_handle);
 929
 930     return major;
 931 }