www.project-moonshot.org Git - mech_eap.orig/blob - init_sec_context.c

   1 /*
   2  * Copyright (c) 2010, 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 #include "gssapiP_eap.h"
  34
  35 #ifdef GSSEAP_ENABLE_REAUTH
  36 static OM_uint32
  37 eapGssSmInitGssReauth(OM_uint32 *minor,
  38                       gss_cred_id_t cred,
  39                       gss_ctx_id_t ctx,
  40                       gss_name_t target,
  41                       gss_OID mech,
  42                       OM_uint32 reqFlags,
  43                       OM_uint32 timeReq,
  44                       gss_channel_bindings_t chanBindings,
  45                       gss_buffer_t inputToken,
  46                       gss_buffer_t outputToken);
  47 #endif
  48
  49 static OM_uint32
  50 policyVariableToFlag(enum eapol_bool_var variable)
  51 {
  52     OM_uint32 flag = 0;
  53
  54     switch (variable) {
  55     case EAPOL_eapSuccess:
  56         flag = CTX_FLAG_EAP_SUCCESS;
  57         break;
  58     case EAPOL_eapRestart:
  59         flag = CTX_FLAG_EAP_RESTART;
  60         break;
  61     case EAPOL_eapFail:
  62         flag = CTX_FLAG_EAP_FAIL;
  63         break;
  64     case EAPOL_eapResp:
  65         flag = CTX_FLAG_EAP_RESP;
  66         break;
  67     case EAPOL_eapNoResp:
  68         flag = CTX_FLAG_EAP_NO_RESP;
  69         break;
  70     case EAPOL_eapReq:
  71         flag = CTX_FLAG_EAP_REQ;
  72         break;
  73     case EAPOL_portEnabled:
  74         flag = CTX_FLAG_EAP_PORT_ENABLED;
  75         break;
  76     case EAPOL_altAccept:
  77         flag = CTX_FLAG_EAP_ALT_ACCEPT;
  78         break;
  79     case EAPOL_altReject:
  80         flag = CTX_FLAG_EAP_ALT_REJECT;
  81         break;
  82     }
  83
  84     return flag;
  85 }
  86
  87 static struct eap_peer_config *
  88 peerGetConfig(void *ctx)
  89 {
  90     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
  91
  92     return &gssCtx->initiatorCtx.eapPeerConfig;
  93 }
  94
  95 static Boolean
  96 peerGetBool(void *data, enum eapol_bool_var variable)
  97 {
  98     gss_ctx_id_t ctx = data;
  99     OM_uint32 flag;
 100
 101     if (ctx == GSS_C_NO_CONTEXT)
 102         return FALSE;
 103
 104     flag = policyVariableToFlag(variable);
 105
 106     return ((ctx->flags & flag) != 0);
 107 }
 108
 109 static void
 110 peerSetBool(void *data, enum eapol_bool_var variable,
 111             Boolean value)
 112 {
 113     gss_ctx_id_t ctx = data;
 114     OM_uint32 flag;
 115
 116     if (ctx == GSS_C_NO_CONTEXT)
 117         return;
 118
 119     flag = policyVariableToFlag(variable);
 120
 121     if (value)
 122         ctx->flags |= flag;
 123     else
 124         ctx->flags &= ~(flag);
 125 }
 126
 127 static unsigned int
 128 peerGetInt(void *data, enum eapol_int_var variable)
 129 {
 130     gss_ctx_id_t ctx = data;
 131
 132     if (ctx == GSS_C_NO_CONTEXT)
 133         return FALSE;
 134
 135     assert(CTX_IS_INITIATOR(ctx));
 136
 137     switch (variable) {
 138     case EAPOL_idleWhile:
 139         return ctx->initiatorCtx.idleWhile;
 140         break;
 141     }
 142
 143     return 0;
 144 }
 145
 146 static void
 147 peerSetInt(void *data, enum eapol_int_var variable,
 148            unsigned int value)
 149 {
 150     gss_ctx_id_t ctx = data;
 151
 152     if (ctx == GSS_C_NO_CONTEXT)
 153         return;
 154
 155     assert(CTX_IS_INITIATOR(ctx));
 156
 157     switch (variable) {
 158     case EAPOL_idleWhile:
 159         ctx->initiatorCtx.idleWhile = value;
 160         break;
 161     }
 162 }
 163
 164 static struct wpabuf *
 165 peerGetEapReqData(void *ctx)
 166 {
 167     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
 168
 169     return &gssCtx->initiatorCtx.reqData;
 170 }
 171
 172 static void
 173 peerSetConfigBlob(void *ctx, struct wpa_config_blob *blob)
 174 {
 175 }
 176
 177 static const struct wpa_config_blob *
 178 peerGetConfigBlob(void *ctx, const char *name)
 179 {
 180     return NULL;
 181 }
 182
 183 static void
 184 peerNotifyPending(void *ctx)
 185 {
 186 }
 187
 188 static struct eapol_callbacks gssEapPolicyCallbacks = {
 189     peerGetConfig,
 190     peerGetBool,
 191     peerSetBool,
 192     peerGetInt,
 193     peerSetInt,
 194     peerGetEapReqData,
 195     peerSetConfigBlob,
 196     peerGetConfigBlob,
 197     peerNotifyPending,
 198 };
 199
 200 extern int wpa_debug_level;
 201
 202 static OM_uint32
 203 peerConfigInit(OM_uint32 *minor,
 204                gss_cred_id_t cred,
 205                gss_ctx_id_t ctx)
 206 {
 207     krb5_context krbContext;
 208     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 209     krb5_error_code code;
 210     char *identity;
 211
 212     eapPeerConfig->identity = NULL;
 213     eapPeerConfig->identity_len = 0;
 214     eapPeerConfig->password = NULL;
 215     eapPeerConfig->password_len = 0;
 216
 217     assert(cred != GSS_C_NO_CREDENTIAL);
 218
 219     GSSEAP_KRB_INIT(&krbContext);
 220
 221     eapPeerConfig->fragment_size = 1024;
 222     wpa_debug_level = 0;
 223
 224     code = krb5_unparse_name(krbContext, cred->name->krbPrincipal, &identity);
 225     if (code != 0) {
 226         *minor = code;
 227         return GSS_S_FAILURE;
 228     }
 229
 230     eapPeerConfig->identity = (unsigned char *)identity;
 231     eapPeerConfig->identity_len = strlen(identity);
 232     eapPeerConfig->password = (unsigned char *)cred->password.value;
 233     eapPeerConfig->password_len = cred->password.length;
 234
 235     return GSS_S_COMPLETE;
 236 }
 237
 238 static OM_uint32
 239 peerConfigFree(OM_uint32 *minor,
 240                gss_ctx_id_t ctx)
 241 {
 242     krb5_context krbContext;
 243     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 244
 245     GSSEAP_KRB_INIT(&krbContext);
 246
 247     krb5_free_unparsed_name(krbContext, (char *)eapPeerConfig->identity);
 248
 249     return GSS_S_COMPLETE;
 250 }
 251
 252 static OM_uint32
 253 initReady(OM_uint32 *minor, gss_ctx_id_t ctx, OM_uint32 reqFlags)
 254 {
 255     OM_uint32 major;
 256     const unsigned char *key;
 257     size_t keyLength;
 258     krb5_enctype encryptionType;
 259     int gotKey = 0;
 260
 261 #if 1
 262     /* XXX actually check for mutual auth */
 263     if (reqFlags & GSS_C_MUTUAL_FLAG)
 264         ctx->gssFlags |= GSS_C_MUTUAL_FLAG;
 265 #endif
 266
 267     /* Cache encryption type derived from selected mechanism OID */
 268     major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &encryptionType);
 269     if (GSS_ERROR(major))
 270         return major;
 271
 272     if (encryptionType != ENCTYPE_NULL &&
 273         eap_key_available(ctx->initiatorCtx.eap)) {
 274         key = eap_get_eapKeyData(ctx->initiatorCtx.eap, &keyLength);
 275
 276         if (keyLength >= EAP_EMSK_LEN) {
 277             major = gssEapDeriveRfc3961Key(minor,
 278                                            &key[EAP_EMSK_LEN / 2],
 279                                            EAP_EMSK_LEN / 2,
 280                                            encryptionType,
 281                                            &ctx->rfc3961Key);
 282                if (GSS_ERROR(major))
 283                    return major;
 284
 285             major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 286                                               &ctx->checksumType);
 287             if (GSS_ERROR(major))
 288                 return major;
 289             gotKey++;
 290         }
 291     }
 292
 293     if (gotKey) {
 294         ctx->encryptionType = encryptionType;
 295     } else {
 296         /*
 297          * draft-howlett-eap-gss says that integrity/confidentialty should
 298          * always be advertised as available, but if we have no keying
 299          * material it seems confusing to the caller to advertise this.
 300          */
 301         ctx->gssFlags &= ~(GSS_C_INTEG_FLAG | GSS_C_CONF_FLAG);
 302     }
 303
 304     major = sequenceInit(minor,
 305                          &ctx->seqState,
 306                          ctx->recvSeq,
 307                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 308                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 309                          TRUE);
 310     if (GSS_ERROR(major))
 311         return major;
 312
 313     return GSS_S_COMPLETE;
 314 }
 315
 316 static OM_uint32
 317 initBegin(OM_uint32 *minor,
 318           gss_cred_id_t cred,
 319           gss_ctx_id_t ctx,
 320           gss_name_t target,
 321           gss_OID mech,
 322           OM_uint32 reqFlags,
 323           OM_uint32 timeReq,
 324           gss_channel_bindings_t chanBindings,
 325           gss_buffer_t inputToken,
 326           gss_buffer_t outputToken)
 327 {
 328     OM_uint32 major;
 329
 330     assert(cred != GSS_C_NO_CREDENTIAL);
 331
 332     if (cred->expiryTime)
 333         ctx->expiryTime = cred->expiryTime;
 334     else if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
 335         ctx->expiryTime = 0;
 336     else
 337         ctx->expiryTime = time(NULL) + timeReq;
 338
 339     major = gssEapDuplicateName(minor, cred->name, &ctx->initiatorName);
 340     if (GSS_ERROR(major))
 341         return major;
 342
 343     major = gssEapDuplicateName(minor, target, &ctx->acceptorName);
 344     if (GSS_ERROR(major))
 345         return major;
 346
 347     if (mech == GSS_C_NULL_OID || oidEqual(mech, GSS_EAP_MECHANISM)) {
 348         major = gssEapDefaultMech(minor, &ctx->mechanismUsed);
 349     } else if (gssEapIsConcreteMechanismOid(mech)) {
 350         if (!gssEapInternalizeOid(mech, &ctx->mechanismUsed))
 351             major = duplicateOid(minor, mech, &ctx->mechanismUsed);
 352     } else {
 353         major = GSS_S_BAD_MECH;
 354     }
 355     if (GSS_ERROR(major))
 356         return major;
 357
 358     /* If credentials were provided, check they're usable with this mech */
 359     if (!gssEapCredAvailable(cred, ctx->mechanismUsed))
 360         return GSS_S_BAD_MECH;
 361
 362     return GSS_S_COMPLETE;
 363 }
 364
 365 static OM_uint32
 366 eapGssSmInitIdentity(OM_uint32 *minor,
 367                      gss_cred_id_t cred,
 368                      gss_ctx_id_t ctx,
 369                      gss_name_t target,
 370                      gss_OID mech,
 371                      OM_uint32 reqFlags,
 372                      OM_uint32 timeReq,
 373                      gss_channel_bindings_t chanBindings,
 374                      gss_buffer_t inputToken,
 375                      gss_buffer_t outputToken)
 376 {
 377     OM_uint32 major;
 378     int initialContextToken;
 379
 380     initialContextToken = (inputToken->length == 0);
 381     if (!initialContextToken)
 382         return GSS_S_DEFECTIVE_TOKEN;
 383
 384     major = initBegin(minor, cred, ctx, target, mech,
 385                       reqFlags, timeReq, chanBindings,
 386                       inputToken, outputToken);
 387     if (GSS_ERROR(major))
 388         return major;
 389
 390     ctx->state = EAP_STATE_AUTHENTICATE;
 391
 392     return GSS_S_CONTINUE_NEEDED;
 393 }
 394
 395 static struct wpabuf emptyWpaBuffer;
 396
 397 static OM_uint32
 398 eapGssSmInitAuthenticate(OM_uint32 *minor,
 399                          gss_cred_id_t cred,
 400                          gss_ctx_id_t ctx,
 401                          gss_name_t target,
 402                          gss_OID mech,
 403                          OM_uint32 reqFlags,
 404                          OM_uint32 timeReq,
 405                          gss_channel_bindings_t chanBindings,
 406                          gss_buffer_t inputToken,
 407                          gss_buffer_t outputToken)
 408 {
 409     OM_uint32 major;
 410     OM_uint32 tmpMinor;
 411     int code;
 412     struct wpabuf *resp = NULL;
 413     int initialContextToken;
 414
 415     initialContextToken = (inputToken == GSS_C_NO_BUFFER ||
 416                            inputToken->length == 0);
 417
 418     major = peerConfigInit(minor, cred, ctx);
 419     if (GSS_ERROR(major))
 420         goto cleanup;
 421
 422     if (ctx->initiatorCtx.eap == NULL) {
 423         struct eap_config eapConfig;
 424
 425         memset(&eapConfig, 0, sizeof(eapConfig));
 426
 427         ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 428                                                  &gssEapPolicyCallbacks,
 429                                                  ctx,
 430                                                  &eapConfig);
 431         if (ctx->initiatorCtx.eap == NULL) {
 432             major = GSS_S_FAILURE;
 433             goto cleanup;
 434         }
 435
 436         ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 437     }
 438
 439     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 440
 441     wpabuf_set(&ctx->initiatorCtx.reqData,
 442                inputToken->value, inputToken->length);
 443
 444     major = GSS_S_CONTINUE_NEEDED;
 445
 446     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 447     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 448         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 449
 450         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 451     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 452         major = initReady(minor, ctx, reqFlags);
 453         if (GSS_ERROR(major))
 454             goto cleanup;
 455
 456         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 457         major = GSS_S_CONTINUE_NEEDED;
 458         ctx->state = EAP_STATE_EXTENSIONS_REQ;
 459     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 460         major = GSS_S_DEFECTIVE_CREDENTIAL;
 461     } else if (code == 0 && initialContextToken) {
 462         resp = &emptyWpaBuffer;
 463         major = GSS_S_CONTINUE_NEEDED;
 464     } else {
 465         major = GSS_S_DEFECTIVE_TOKEN;
 466     }
 467
 468 cleanup:
 469     if (resp != NULL) {
 470         OM_uint32 tmpMajor;
 471         gss_buffer_desc respBuf;
 472
 473         assert(major == GSS_S_CONTINUE_NEEDED);
 474
 475         respBuf.length = wpabuf_len(resp);
 476         respBuf.value = (void *)wpabuf_head(resp);
 477
 478         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 479         if (GSS_ERROR(tmpMajor)) {
 480             major = tmpMajor;
 481             *minor = tmpMinor;
 482         }
 483     }
 484
 485     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 486     peerConfigFree(&tmpMinor, ctx);
 487
 488     return major;
 489 }
 490
 491 static OM_uint32
 492 initGssChannelBindings(OM_uint32 *minor,
 493                        gss_ctx_id_t ctx,
 494                        gss_channel_bindings_t chanBindings,
 495                        gss_buffer_t outputToken)
 496 {
 497     OM_uint32 major;
 498     gss_buffer_desc buffer = GSS_C_EMPTY_BUFFER;
 499
 500
 501     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
 502         buffer = chanBindings->application_data;
 503
 504     major = gssEapWrap(minor, ctx, TRUE, GSS_C_QOP_DEFAULT,
 505                        &buffer, NULL, outputToken);
 506     if (GSS_ERROR(major))
 507         return major;
 508
 509     return GSS_S_CONTINUE_NEEDED;
 510 }
 511
 512 static OM_uint32
 513 eapGssSmInitExtensionsReq(OM_uint32 *minor,
 514                           gss_cred_id_t cred,
 515                           gss_ctx_id_t ctx,
 516                           gss_name_t target,
 517                           gss_OID mech,
 518                           OM_uint32 reqFlags,
 519                           OM_uint32 timeReq,
 520                           gss_channel_bindings_t chanBindings,
 521                           gss_buffer_t inputToken,
 522                           gss_buffer_t outputToken)
 523 {
 524     OM_uint32 major, tmpMinor;
 525     gss_buffer_desc cbToken = GSS_C_EMPTY_BUFFER;
 526
 527     major = initGssChannelBindings(minor, ctx, chanBindings, &cbToken);
 528     if (GSS_ERROR(major))
 529         return major;
 530
 531     ctx->state = EAP_STATE_EXTENSIONS_RESP;
 532
 533     major = duplicateBuffer(minor, &cbToken, outputToken);
 534     if (GSS_ERROR(major)) {
 535         gss_release_buffer(&tmpMinor, &cbToken);
 536         return major;
 537     }
 538
 539     gss_release_buffer(&tmpMinor, &cbToken);
 540
 541     return GSS_S_CONTINUE_NEEDED;
 542 }
 543
 544 static OM_uint32
 545 eapGssSmInitExtensionsResp(OM_uint32 *minor,
 546                            gss_cred_id_t cred,
 547                            gss_ctx_id_t ctx,
 548                            gss_name_t target,
 549                            gss_OID mech,
 550                            OM_uint32 reqFlags,
 551                            OM_uint32 timeReq,
 552                            gss_channel_bindings_t chanBindings,
 553                            gss_buffer_t inputToken,
 554                            gss_buffer_t outputToken)
 555 {
 556 #ifdef GSSEAP_ENABLE_REAUTH
 557     OM_uint32 major;
 558
 559     major = gssEapStoreReauthCreds(minor, ctx, cred, inputToken);
 560     if (GSS_ERROR(major))
 561         return major;
 562 #endif
 563
 564     ctx->state = EAP_STATE_ESTABLISHED;
 565
 566     return GSS_S_COMPLETE;
 567 }
 568
 569 static OM_uint32
 570 eapGssSmInitEstablished(OM_uint32 *minor,
 571                         gss_cred_id_t cred,
 572                         gss_ctx_id_t ctx,
 573                         gss_name_t target,
 574                         gss_OID mech,
 575                         OM_uint32 reqFlags,
 576                         OM_uint32 timeReq,
 577                         gss_channel_bindings_t chanBindings,
 578                         gss_buffer_t inputToken,
 579                         gss_buffer_t outputToken)
 580 {
 581     /* Called with already established context */
 582     *minor = EINVAL;
 583     return GSS_S_BAD_STATUS;
 584 }
 585
 586 static struct gss_eap_initiator_sm {
 587     enum gss_eap_token_type inputTokenType;
 588     enum gss_eap_token_type outputTokenType;
 589     OM_uint32 (*processToken)(OM_uint32 *,
 590                               gss_cred_id_t,
 591                               gss_ctx_id_t,
 592                               gss_name_t,
 593                               gss_OID,
 594                               OM_uint32,
 595                               OM_uint32,
 596                               gss_channel_bindings_t,
 597                               gss_buffer_t,
 598                               gss_buffer_t);
 599 } eapGssInitiatorSm[] = {
 600     { TOK_TYPE_NONE,    TOK_TYPE_EAP_RESP,      eapGssSmInitIdentity            },
 601     { TOK_TYPE_EAP_REQ, TOK_TYPE_EAP_RESP,      eapGssSmInitAuthenticate        },
 602     { TOK_TYPE_NONE,    TOK_TYPE_EXT_REQ,       eapGssSmInitExtensionsReq       },
 603     { TOK_TYPE_EXT_RESP,TOK_TYPE_NONE,          eapGssSmInitExtensionsResp      },
 604     { TOK_TYPE_NONE,    TOK_TYPE_NONE,          eapGssSmInitEstablished         },
 605 #ifdef GSSEAP_ENABLE_REAUTH
 606     { TOK_TYPE_GSS_REAUTH, TOK_TYPE_GSS_REAUTH, eapGssSmInitGssReauth           },
 607 #endif
 608 };
 609
 610 OM_uint32
 611 gss_init_sec_context(OM_uint32 *minor,
 612                      gss_cred_id_t cred,
 613                      gss_ctx_id_t *context_handle,
 614                      gss_name_t target_name,
 615                      gss_OID mech_type,
 616                      OM_uint32 req_flags,
 617                      OM_uint32 time_req,
 618                      gss_channel_bindings_t input_chan_bindings,
 619                      gss_buffer_t input_token,
 620                      gss_OID *actual_mech_type,
 621                      gss_buffer_t output_token,
 622                      OM_uint32 *ret_flags,
 623                      OM_uint32 *time_rec)
 624 {
 625     OM_uint32 major;
 626     OM_uint32 tmpMajor, tmpMinor;
 627     gss_ctx_id_t ctx = *context_handle;
 628     struct gss_eap_initiator_sm *sm = NULL;
 629     gss_buffer_desc innerInputToken;
 630     gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER;
 631     enum gss_eap_token_type tokType;
 632     gss_cred_id_t defaultCred = GSS_C_NO_CREDENTIAL;
 633     int initialContextToken = 0;
 634
 635     *minor = 0;
 636
 637     output_token->length = 0;
 638     output_token->value = NULL;
 639
 640     if (ctx == GSS_C_NO_CONTEXT) {
 641         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 642             return GSS_S_DEFECTIVE_TOKEN;
 643         }
 644
 645         major = gssEapAllocContext(minor, &ctx);
 646         if (GSS_ERROR(major))
 647             return major;
 648
 649         ctx->flags |= CTX_FLAG_INITIATOR;
 650
 651         initialContextToken = 1;
 652         *context_handle = ctx;
 653     }
 654
 655     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 656
 657     if (cred == GSS_C_NO_CREDENTIAL) {
 658         if (ctx->initiatorCtx.defaultCred == GSS_C_NO_CREDENTIAL) {
 659             major = gssEapAcquireCred(minor,
 660                                       GSS_C_NO_NAME,
 661                                       GSS_C_NO_BUFFER,
 662                                       time_req,
 663                                       GSS_C_NO_OID_SET,
 664                                       GSS_C_INITIATE,
 665                                       &defaultCred,
 666                                       NULL,
 667                                       NULL);
 668             if (GSS_ERROR(major))
 669                 goto cleanup;
 670         }
 671
 672         cred = ctx->initiatorCtx.defaultCred;
 673     }
 674
 675     GSSEAP_MUTEX_LOCK(&cred->mutex);
 676
 677 #ifdef GSSEAP_ENABLE_REAUTH
 678     if (initialContextToken && gssEapCanReauthP(cred, target_name, time_req))
 679             ctx->state = EAP_STATE_KRB_REAUTH_GSS;
 680 #endif
 681
 682     if ((cred->flags & CRED_FLAG_INITIATE) == 0) {
 683         major = GSS_S_NO_CRED;
 684         goto cleanup;
 685     }
 686
 687     sm = &eapGssInitiatorSm[ctx->state];
 688
 689     if (input_token != GSS_C_NO_BUFFER) {
 690         major = gssEapVerifyToken(minor, ctx, input_token,
 691                                   &tokType, &innerInputToken);
 692         if (GSS_ERROR(major))
 693             goto cleanup;
 694
 695         if (tokType != sm->inputTokenType) {
 696             major = GSS_S_DEFECTIVE_TOKEN;
 697             goto cleanup;
 698         }
 699     } else {
 700         innerInputToken.length = 0;
 701         innerInputToken.value = NULL;
 702     }
 703
 704     /*
 705      * Advance through state machine whilst empty tokens are emitted and
 706      * the status is not GSS_S_COMPLETE or an error status.
 707      */
 708     do {
 709         sm = &eapGssInitiatorSm[ctx->state];
 710
 711         major = (sm->processToken)(minor,
 712                                    cred,
 713                                    ctx,
 714                                    target_name,
 715                                    mech_type,
 716                                    req_flags,
 717                                    time_req,
 718                                    input_chan_bindings,
 719                                    &innerInputToken,
 720                                    &innerOutputToken);
 721         if (GSS_ERROR(major))
 722             goto cleanup;
 723     } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.value == NULL);
 724
 725     if (actual_mech_type != NULL) {
 726         if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
 727             duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
 728     }
 729     if (innerOutputToken.value != NULL) {
 730         tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
 731                                    sm->outputTokenType, output_token);
 732         if (GSS_ERROR(tmpMajor)) {
 733             major = tmpMajor;
 734             *minor = tmpMinor;
 735             goto cleanup;
 736         }
 737     }
 738     if (ret_flags != NULL)
 739         *ret_flags = ctx->gssFlags;
 740     if (time_rec != NULL)
 741         gssEapContextTime(&tmpMinor, ctx, time_rec);
 742
 743     assert(ctx->state == EAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
 744
 745 cleanup:
 746     if (cred != GSS_C_NO_CREDENTIAL)
 747         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
 748     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 749
 750     if (GSS_ERROR(major))
 751         gssEapReleaseContext(&tmpMinor, context_handle);
 752
 753     gss_release_buffer(&tmpMinor, &innerOutputToken);
 754
 755     return major;
 756 }
 757
 758 #ifdef GSSEAP_ENABLE_REAUTH
 759 static OM_uint32
 760 eapGssSmInitGssReauth(OM_uint32 *minor,
 761                       gss_cred_id_t cred,
 762                       gss_ctx_id_t ctx,
 763                       gss_name_t target,
 764                       gss_OID mech,
 765                       OM_uint32 reqFlags,
 766                       OM_uint32 timeReq,
 767                       gss_channel_bindings_t chanBindings,
 768                       gss_buffer_t inputToken,
 769                       gss_buffer_t outputToken)
 770 {
 771     OM_uint32 major, tmpMinor;
 772     gss_name_t mechTarget = GSS_C_NO_NAME;
 773     gss_OID actualMech = GSS_C_NO_OID;
 774     OM_uint32 gssFlags, timeRec;
 775
 776     assert(cred != GSS_C_NO_CREDENTIAL);
 777
 778     ctx->flags |= CTX_FLAG_KRB_REAUTH_GSS;
 779
 780     if (inputToken->length == 0) {
 781         major = initBegin(minor, cred, ctx, target, mech,
 782                           reqFlags, timeReq, chanBindings,
 783                           inputToken, outputToken);
 784         if (GSS_ERROR(major))
 785             goto cleanup;
 786     }
 787
 788     major = gssEapMechToGlueName(minor, target, &mechTarget);
 789     if (GSS_ERROR(major))
 790         goto cleanup;
 791
 792     major = gssInitSecContext(minor,
 793                               cred->krbCred,
 794                               &ctx->kerberosCtx,
 795                               mechTarget,
 796                               (gss_OID)gss_mech_krb5,
 797                               reqFlags, /* | GSS_C_DCE_STYLE, */
 798                               timeReq,
 799                               chanBindings,
 800                               inputToken,
 801                               &actualMech,
 802                               outputToken,
 803                               &gssFlags,
 804                               &timeRec);
 805     if (GSS_ERROR(major))
 806         goto cleanup;
 807
 808     ctx->gssFlags = gssFlags;
 809
 810     if (major == GSS_S_COMPLETE) {
 811         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 812         if (GSS_ERROR(major))
 813             goto cleanup;
 814         ctx->state = EAP_STATE_ESTABLISHED;
 815     }
 816
 817 cleanup:
 818     gssReleaseName(&tmpMinor, &mechTarget);
 819
 820     return major;
 821 }
 822 #endif /* GSSEAP_ENABLE_REAUTH */