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     /*
 340      * The credential mutex protects its name, however we need to
 341      * explicitly lock the acceptor name (unlikely as it may be
 342      * that it has attributes set on it).
 343      */
 344     major = gssEapDuplicateName(minor, cred->name, &ctx->initiatorName);
 345     if (GSS_ERROR(major))
 346         return major;
 347
 348     GSSEAP_MUTEX_LOCK(&target->mutex);
 349
 350     major = gssEapDuplicateName(minor, target, &ctx->acceptorName);
 351     if (GSS_ERROR(major)) {
 352         GSSEAP_MUTEX_UNLOCK(&target->mutex);
 353         return major;
 354     }
 355
 356     GSSEAP_MUTEX_UNLOCK(&target->mutex);
 357
 358     if (mech == GSS_C_NULL_OID) {
 359         major = gssEapDefaultMech(minor, &ctx->mechanismUsed);
 360     } else if (gssEapIsConcreteMechanismOid(mech)) {
 361         if (!gssEapInternalizeOid(mech, &ctx->mechanismUsed))
 362             major = duplicateOid(minor, mech, &ctx->mechanismUsed);
 363     } else {
 364         major = GSS_S_BAD_MECH;
 365     }
 366     if (GSS_ERROR(major))
 367         return major;
 368
 369     /* If credentials were provided, check they're usable with this mech */
 370     if (!gssEapCredAvailable(cred, ctx->mechanismUsed))
 371         return GSS_S_BAD_MECH;
 372
 373     return GSS_S_COMPLETE;
 374 }
 375
 376 static OM_uint32
 377 eapGssSmInitIdentity(OM_uint32 *minor,
 378                      gss_cred_id_t cred,
 379                      gss_ctx_id_t ctx,
 380                      gss_name_t target,
 381                      gss_OID mech,
 382                      OM_uint32 reqFlags,
 383                      OM_uint32 timeReq,
 384                      gss_channel_bindings_t chanBindings,
 385                      gss_buffer_t inputToken,
 386                      gss_buffer_t outputToken)
 387 {
 388     OM_uint32 major;
 389     int initialContextToken;
 390
 391     initialContextToken = (inputToken->length == 0);
 392     if (!initialContextToken)
 393         return GSS_S_DEFECTIVE_TOKEN;
 394
 395     major = initBegin(minor, cred, ctx, target, mech,
 396                       reqFlags, timeReq, chanBindings,
 397                       inputToken, outputToken);
 398     if (GSS_ERROR(major))
 399         return major;
 400
 401     ctx->state = EAP_STATE_AUTHENTICATE;
 402
 403     return GSS_S_CONTINUE_NEEDED;
 404 }
 405
 406 static struct wpabuf emptyWpaBuffer;
 407
 408 static OM_uint32
 409 eapGssSmInitAuthenticate(OM_uint32 *minor,
 410                          gss_cred_id_t cred,
 411                          gss_ctx_id_t ctx,
 412                          gss_name_t target,
 413                          gss_OID mech,
 414                          OM_uint32 reqFlags,
 415                          OM_uint32 timeReq,
 416                          gss_channel_bindings_t chanBindings,
 417                          gss_buffer_t inputToken,
 418                          gss_buffer_t outputToken)
 419 {
 420     OM_uint32 major;
 421     OM_uint32 tmpMinor;
 422     int code;
 423     struct wpabuf *resp = NULL;
 424     int initialContextToken;
 425
 426     initialContextToken = (inputToken == GSS_C_NO_BUFFER ||
 427                            inputToken->length == 0);
 428
 429     major = peerConfigInit(minor, cred, ctx);
 430     if (GSS_ERROR(major))
 431         goto cleanup;
 432
 433     if (ctx->initiatorCtx.eap == NULL) {
 434         struct eap_config eapConfig;
 435
 436         memset(&eapConfig, 0, sizeof(eapConfig));
 437
 438         ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 439                                                  &gssEapPolicyCallbacks,
 440                                                  ctx,
 441                                                  &eapConfig);
 442         if (ctx->initiatorCtx.eap == NULL) {
 443             major = GSS_S_FAILURE;
 444             goto cleanup;
 445         }
 446
 447         ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
 448     }
 449
 450     ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 451
 452     wpabuf_set(&ctx->initiatorCtx.reqData,
 453                inputToken->value, inputToken->length);
 454
 455     major = GSS_S_CONTINUE_NEEDED;
 456
 457     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 458     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 459         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 460
 461         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 462     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 463         major = initReady(minor, ctx, reqFlags);
 464         if (GSS_ERROR(major))
 465             goto cleanup;
 466
 467         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 468         major = GSS_S_CONTINUE_NEEDED;
 469         ctx->state = EAP_STATE_EXTENSIONS_REQ;
 470     } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
 471         major = GSS_S_DEFECTIVE_CREDENTIAL;
 472     } else if (code == 0 && initialContextToken) {
 473         resp = &emptyWpaBuffer;
 474         major = GSS_S_CONTINUE_NEEDED;
 475     } else {
 476         major = GSS_S_DEFECTIVE_TOKEN;
 477     }
 478
 479 cleanup:
 480     if (resp != NULL) {
 481         OM_uint32 tmpMajor;
 482         gss_buffer_desc respBuf;
 483
 484         assert(major == GSS_S_CONTINUE_NEEDED);
 485
 486         respBuf.length = wpabuf_len(resp);
 487         respBuf.value = (void *)wpabuf_head(resp);
 488
 489         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 490         if (GSS_ERROR(tmpMajor)) {
 491             major = tmpMajor;
 492             *minor = tmpMinor;
 493         }
 494     }
 495
 496     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 497     peerConfigFree(&tmpMinor, ctx);
 498
 499     return major;
 500 }
 501
 502 static OM_uint32
 503 initGssChannelBindings(OM_uint32 *minor,
 504                        gss_ctx_id_t ctx,
 505                        gss_channel_bindings_t chanBindings,
 506                        gss_buffer_t outputToken)
 507 {
 508     OM_uint32 major;
 509     gss_buffer_desc buffer = GSS_C_EMPTY_BUFFER;
 510
 511
 512     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
 513         buffer = chanBindings->application_data;
 514
 515     major = gssEapWrap(minor, ctx, TRUE, GSS_C_QOP_DEFAULT,
 516                        &buffer, NULL, outputToken);
 517     if (GSS_ERROR(major))
 518         return major;
 519
 520     return GSS_S_CONTINUE_NEEDED;
 521 }
 522
 523 static OM_uint32
 524 eapGssSmInitExtensionsReq(OM_uint32 *minor,
 525                           gss_cred_id_t cred,
 526                           gss_ctx_id_t ctx,
 527                           gss_name_t target,
 528                           gss_OID mech,
 529                           OM_uint32 reqFlags,
 530                           OM_uint32 timeReq,
 531                           gss_channel_bindings_t chanBindings,
 532                           gss_buffer_t inputToken,
 533                           gss_buffer_t outputToken)
 534 {
 535     OM_uint32 major, tmpMinor;
 536     gss_buffer_desc cbToken = GSS_C_EMPTY_BUFFER;
 537
 538     major = initGssChannelBindings(minor, ctx, chanBindings, &cbToken);
 539     if (GSS_ERROR(major))
 540         return major;
 541
 542     ctx->state = EAP_STATE_EXTENSIONS_RESP;
 543
 544     major = duplicateBuffer(minor, &cbToken, outputToken);
 545     if (GSS_ERROR(major)) {
 546         gss_release_buffer(&tmpMinor, &cbToken);
 547         return major;
 548     }
 549
 550     gss_release_buffer(&tmpMinor, &cbToken);
 551
 552     return GSS_S_CONTINUE_NEEDED;
 553 }
 554
 555 static OM_uint32
 556 eapGssSmInitExtensionsResp(OM_uint32 *minor,
 557                            gss_cred_id_t cred,
 558                            gss_ctx_id_t ctx,
 559                            gss_name_t target,
 560                            gss_OID mech,
 561                            OM_uint32 reqFlags,
 562                            OM_uint32 timeReq,
 563                            gss_channel_bindings_t chanBindings,
 564                            gss_buffer_t inputToken,
 565                            gss_buffer_t outputToken)
 566 {
 567 #ifdef GSSEAP_ENABLE_REAUTH
 568     OM_uint32 major;
 569
 570     major = gssEapStoreReauthCreds(minor, ctx, cred, inputToken);
 571     if (GSS_ERROR(major))
 572         return major;
 573 #endif
 574
 575     ctx->state = EAP_STATE_ESTABLISHED;
 576
 577     return GSS_S_COMPLETE;
 578 }
 579
 580 static OM_uint32
 581 eapGssSmInitEstablished(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 {
 592     /* Called with already established context */
 593     *minor = EINVAL;
 594     return GSS_S_BAD_STATUS;
 595 }
 596
 597 static struct gss_eap_initiator_sm {
 598     enum gss_eap_token_type inputTokenType;
 599     enum gss_eap_token_type outputTokenType;
 600     OM_uint32 (*processToken)(OM_uint32 *,
 601                               gss_cred_id_t,
 602                               gss_ctx_id_t,
 603                               gss_name_t,
 604                               gss_OID,
 605                               OM_uint32,
 606                               OM_uint32,
 607                               gss_channel_bindings_t,
 608                               gss_buffer_t,
 609                               gss_buffer_t);
 610 } eapGssInitiatorSm[] = {
 611     { TOK_TYPE_NONE,    TOK_TYPE_EAP_RESP,      eapGssSmInitIdentity            },
 612     { TOK_TYPE_EAP_REQ, TOK_TYPE_EAP_RESP,      eapGssSmInitAuthenticate        },
 613     { TOK_TYPE_NONE,    TOK_TYPE_EXT_REQ,       eapGssSmInitExtensionsReq       },
 614     { TOK_TYPE_EXT_RESP,TOK_TYPE_NONE,          eapGssSmInitExtensionsResp      },
 615     { TOK_TYPE_NONE,    TOK_TYPE_NONE,          eapGssSmInitEstablished         },
 616 #ifdef GSSEAP_ENABLE_REAUTH
 617     { TOK_TYPE_GSS_REAUTH, TOK_TYPE_GSS_REAUTH, eapGssSmInitGssReauth           },
 618 #endif
 619 };
 620
 621 OM_uint32
 622 gss_init_sec_context(OM_uint32 *minor,
 623                      gss_cred_id_t cred,
 624                      gss_ctx_id_t *context_handle,
 625                      gss_name_t target_name,
 626                      gss_OID mech_type,
 627                      OM_uint32 req_flags,
 628                      OM_uint32 time_req,
 629                      gss_channel_bindings_t input_chan_bindings,
 630                      gss_buffer_t input_token,
 631                      gss_OID *actual_mech_type,
 632                      gss_buffer_t output_token,
 633                      OM_uint32 *ret_flags,
 634                      OM_uint32 *time_rec)
 635 {
 636     OM_uint32 major;
 637     OM_uint32 tmpMajor, tmpMinor;
 638     gss_ctx_id_t ctx = *context_handle;
 639     struct gss_eap_initiator_sm *sm = NULL;
 640     gss_buffer_desc innerInputToken;
 641     gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER;
 642     enum gss_eap_token_type tokType;
 643     gss_cred_id_t defaultCred = GSS_C_NO_CREDENTIAL;
 644     int initialContextToken = 0;
 645
 646     *minor = 0;
 647
 648     output_token->length = 0;
 649     output_token->value = NULL;
 650
 651     if (ctx == GSS_C_NO_CONTEXT) {
 652         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 653             return GSS_S_DEFECTIVE_TOKEN;
 654         }
 655
 656         major = gssEapAllocContext(minor, &ctx);
 657         if (GSS_ERROR(major))
 658             return major;
 659
 660         ctx->flags |= CTX_FLAG_INITIATOR;
 661
 662         initialContextToken = 1;
 663         *context_handle = ctx;
 664     }
 665
 666     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 667
 668     if (cred == GSS_C_NO_CREDENTIAL) {
 669         if (ctx->initiatorCtx.defaultCred == GSS_C_NO_CREDENTIAL) {
 670             major = gssEapAcquireCred(minor,
 671                                       GSS_C_NO_NAME,
 672                                       GSS_C_NO_BUFFER,
 673                                       time_req,
 674                                       GSS_C_NO_OID_SET,
 675                                       GSS_C_INITIATE,
 676                                       &defaultCred,
 677                                       NULL,
 678                                       NULL);
 679             if (GSS_ERROR(major))
 680                 goto cleanup;
 681         }
 682
 683         cred = ctx->initiatorCtx.defaultCred;
 684     }
 685
 686     GSSEAP_MUTEX_LOCK(&cred->mutex);
 687
 688 #ifdef GSSEAP_ENABLE_REAUTH
 689     if (initialContextToken && gssEapCanReauthP(cred, target_name, time_req))
 690             ctx->state = EAP_STATE_KRB_REAUTH_GSS;
 691 #endif
 692
 693     if ((cred->flags & CRED_FLAG_INITIATE) == 0) {
 694         major = GSS_S_NO_CRED;
 695         goto cleanup;
 696     }
 697
 698     sm = &eapGssInitiatorSm[ctx->state];
 699
 700     if (input_token != GSS_C_NO_BUFFER) {
 701         major = gssEapVerifyToken(minor, ctx, input_token,
 702                                   &tokType, &innerInputToken);
 703         if (GSS_ERROR(major))
 704             goto cleanup;
 705
 706         if (tokType != sm->inputTokenType) {
 707             major = GSS_S_DEFECTIVE_TOKEN;
 708             goto cleanup;
 709         }
 710     } else {
 711         innerInputToken.length = 0;
 712         innerInputToken.value = NULL;
 713     }
 714
 715     /*
 716      * Advance through state machine whilst empty tokens are emitted and
 717      * the status is not GSS_S_COMPLETE or an error status.
 718      */
 719     do {
 720         sm = &eapGssInitiatorSm[ctx->state];
 721
 722         major = (sm->processToken)(minor,
 723                                    cred,
 724                                    ctx,
 725                                    target_name,
 726                                    mech_type,
 727                                    req_flags,
 728                                    time_req,
 729                                    input_chan_bindings,
 730                                    &innerInputToken,
 731                                    &innerOutputToken);
 732         if (GSS_ERROR(major))
 733             goto cleanup;
 734     } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.value == NULL);
 735
 736     if (actual_mech_type != NULL) {
 737         if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
 738             duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
 739     }
 740     if (innerOutputToken.value != NULL) {
 741         tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
 742                                    sm->outputTokenType, output_token);
 743         if (GSS_ERROR(tmpMajor)) {
 744             major = tmpMajor;
 745             *minor = tmpMinor;
 746             goto cleanup;
 747         }
 748     }
 749     if (ret_flags != NULL)
 750         *ret_flags = ctx->gssFlags;
 751     if (time_rec != NULL)
 752         gssEapContextTime(&tmpMinor, ctx, time_rec);
 753
 754     assert(ctx->state == EAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
 755
 756 cleanup:
 757     if (cred != GSS_C_NO_CREDENTIAL)
 758         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
 759     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 760
 761     if (GSS_ERROR(major))
 762         gssEapReleaseContext(&tmpMinor, context_handle);
 763
 764     gss_release_buffer(&tmpMinor, &innerOutputToken);
 765
 766     return major;
 767 }
 768
 769 #ifdef GSSEAP_ENABLE_REAUTH
 770 static OM_uint32
 771 eapGssSmInitGssReauth(OM_uint32 *minor,
 772                       gss_cred_id_t cred,
 773                       gss_ctx_id_t ctx,
 774                       gss_name_t target,
 775                       gss_OID mech,
 776                       OM_uint32 reqFlags,
 777                       OM_uint32 timeReq,
 778                       gss_channel_bindings_t chanBindings,
 779                       gss_buffer_t inputToken,
 780                       gss_buffer_t outputToken)
 781 {
 782     OM_uint32 major, tmpMinor;
 783     gss_name_t mechTarget = GSS_C_NO_NAME;
 784     gss_OID actualMech = GSS_C_NO_OID;
 785     OM_uint32 gssFlags, timeRec;
 786
 787     assert(cred != GSS_C_NO_CREDENTIAL);
 788
 789     ctx->flags |= CTX_FLAG_KRB_REAUTH_GSS;
 790
 791     if (inputToken->length == 0) {
 792         major = initBegin(minor, cred, ctx, target, mech,
 793                           reqFlags, timeReq, chanBindings,
 794                           inputToken, outputToken);
 795         if (GSS_ERROR(major))
 796             goto cleanup;
 797     }
 798
 799     major = gssEapMechToGlueName(minor, target, &mechTarget);
 800     if (GSS_ERROR(major))
 801         goto cleanup;
 802
 803     major = gssInitSecContext(minor,
 804                               cred->krbCred,
 805                               &ctx->kerberosCtx,
 806                               mechTarget,
 807                               (gss_OID)gss_mech_krb5,
 808                               reqFlags, /* | GSS_C_DCE_STYLE, */
 809                               timeReq,
 810                               chanBindings,
 811                               inputToken,
 812                               &actualMech,
 813                               outputToken,
 814                               &gssFlags,
 815                               &timeRec);
 816     if (GSS_ERROR(major))
 817         goto cleanup;
 818
 819     ctx->gssFlags = gssFlags;
 820
 821     if (major == GSS_S_COMPLETE) {
 822         major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
 823         if (GSS_ERROR(major))
 824             goto cleanup;
 825         ctx->state = EAP_STATE_ESTABLISHED;
 826     }
 827
 828 cleanup:
 829     gssReleaseName(&tmpMinor, &mechTarget);
 830
 831     return major;
 832 }
 833 #endif /* GSSEAP_ENABLE_REAUTH */