accept_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 eapGssSmAcceptGssReauth(OM_uint32 *minor,
  38                         gss_ctx_id_t ctx,
  39                         gss_cred_id_t cred,
  40                         gss_buffer_t inputToken,
  41                         gss_channel_bindings_t chanBindings,
  42                         gss_buffer_t outputToken);
  43 #endif
  44
  45 /*
  46  * Mark a context as ready for cryptographic operations
  47  */
  48 static OM_uint32
  49 acceptReadyEap(OM_uint32 *minor, gss_ctx_id_t ctx, gss_cred_id_t cred)
  50 {
  51     OM_uint32 major, tmpMinor;
  52     VALUE_PAIR *vp;
  53     gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
  54
  55     /* Cache encryption type derived from selected mechanism OID */
  56     major = gssEapOidToEnctype(minor, ctx->mechanismUsed,
  57                                &ctx->encryptionType);
  58     if (GSS_ERROR(major))
  59         return major;
  60
  61     gssEapReleaseName(&tmpMinor, &ctx->initiatorName);
  62
  63     major = gssEapRadiusGetRawAvp(minor, ctx->acceptorCtx.vps,
  64                                   PW_USER_NAME, 0, &vp);
  65     if (major == GSS_S_COMPLETE) {
  66         nameBuf.length = vp->length;
  67         nameBuf.value = vp->vp_strvalue;
  68     } else {
  69         ctx->gssFlags |= GSS_C_ANON_FLAG;
  70     }
  71
  72     major = gssEapImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
  73                              &ctx->initiatorName);
  74     if (GSS_ERROR(major))
  75         return major;
  76
  77     major = gssEapRadiusGetRawAvp(minor, ctx->acceptorCtx.vps,
  78                                   PW_MS_MPPE_SEND_KEY, VENDORPEC_MS, &vp);
  79     if (GSS_ERROR(major)) {
  80         *minor = GSSEAP_KEY_UNAVAILABLE;
  81         return GSS_S_UNAVAILABLE;
  82     }
  83
  84     major = gssEapDeriveRfc3961Key(minor,
  85                                    vp->vp_octets,
  86                                    vp->length,
  87                                    ctx->encryptionType,
  88                                    &ctx->rfc3961Key);
  89     if (GSS_ERROR(major))
  90         return major;
  91
  92     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
  93                                        &ctx->checksumType);
  94     if (GSS_ERROR(major))
  95         return major;
  96
  97     major = sequenceInit(minor,
  98                          &ctx->seqState, ctx->recvSeq,
  99                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 100                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 101                          TRUE);
 102     if (GSS_ERROR(major))
 103         return major;
 104
 105     ctx->initiatorName->attrCtx = gssEapCreateAttrContext(cred, ctx);
 106
 107     return GSS_S_COMPLETE;
 108 }
 109
 110 static OM_uint32
 111 eapGssSmAcceptIdentity(OM_uint32 *minor,
 112                        gss_ctx_id_t ctx,
 113                        gss_cred_id_t cred,
 114                        gss_buffer_t inputToken,
 115                        gss_channel_bindings_t chanBindings,
 116                        gss_buffer_t outputToken)
 117 {
 118     OM_uint32 major;
 119     union {
 120         struct eap_hdr pdu;
 121         unsigned char data[5];
 122     } pkt;
 123     gss_buffer_desc pktBuffer;
 124
 125     if (inputToken != GSS_C_NO_BUFFER && inputToken->length != 0)
 126         return GSS_S_DEFECTIVE_TOKEN;
 127
 128     assert(ctx->acceptorName == GSS_C_NO_NAME);
 129
 130     if (cred != GSS_C_NO_CREDENTIAL && cred->name != GSS_C_NO_NAME) {
 131         major = gssEapDuplicateName(minor, cred->name, &ctx->acceptorName);
 132         if (GSS_ERROR(major))
 133             return major;
 134     }
 135
 136     pkt.pdu.code = EAP_CODE_REQUEST;
 137     pkt.pdu.identifier = 0;
 138     pkt.pdu.length = htons(sizeof(pkt.data));
 139     pkt.data[4] = EAP_TYPE_IDENTITY;
 140
 141     pktBuffer.length = sizeof(pkt.data);
 142     pktBuffer.value = pkt.data;
 143
 144     major = duplicateBuffer(minor, &pktBuffer, outputToken);
 145     if (GSS_ERROR(major))
 146         return major;
 147
 148     ctx->state = EAP_STATE_AUTHENTICATE;
 149
 150     return GSS_S_CONTINUE_NEEDED;
 151 }
 152
 153 static OM_uint32
 154 setAcceptorIdentity(OM_uint32 *minor,
 155                     gss_ctx_id_t ctx,
 156                     VALUE_PAIR **vps)
 157 {
 158     OM_uint32 major;
 159     gss_buffer_desc nameBuf;
 160     krb5_context krbContext = NULL;
 161     krb5_principal krbPrinc;
 162     struct rs_handle *rh = ctx->acceptorCtx.radHandle;
 163
 164     assert(rh != NULL);
 165
 166     /* Awaits further specification */
 167     if (ctx->acceptorName == GSS_C_NO_NAME)
 168         return GSS_S_COMPLETE;
 169
 170     GSSEAP_KRB_INIT(&krbContext);
 171
 172     krbPrinc = ctx->acceptorName->krbPrincipal;
 173     assert(krbPrinc != NULL);
 174
 175     if (krb5_princ_size(krbContext, krbPrinc) < 2)
 176         return GSS_S_BAD_NAME;
 177
 178     /* Acceptor-Service-Name */
 179     krbDataToGssBuffer(krb5_princ_component(krbContext, krbPrinc, 0), &nameBuf);
 180
 181     major = gssEapRadiusAddAvp(minor, vps,
 182                                PW_GSS_ACCEPTOR_SERVICE_NAME,
 183                                VENDORPEC_UKERNA,
 184                                &nameBuf);
 185     if (GSS_ERROR(major))
 186         return major;
 187
 188     /* Acceptor-Host-Name */
 189     krbDataToGssBuffer(krb5_princ_component(krbContext, krbPrinc, 1), &nameBuf);
 190
 191     major = gssEapRadiusAddAvp(minor, vps,
 192                                PW_GSS_ACCEPTOR_HOST_NAME,
 193                                VENDORPEC_UKERNA,
 194                                &nameBuf);
 195     if (GSS_ERROR(major))
 196         return major;
 197
 198     if (krb5_princ_size(krbContext, krbPrinc) > 2) {
 199         /* Acceptor-Service-Specific */
 200         krb5_principal_data ssiPrinc = *krbPrinc;
 201         char *ssi;
 202
 203         krb5_princ_size(krbContext, &ssiPrinc) -= 2;
 204         krb5_princ_name(krbContext, &ssiPrinc) += 2;
 205
 206         *minor = krb5_unparse_name_flags(krbContext, &ssiPrinc,
 207                                          KRB5_PRINCIPAL_UNPARSE_NO_REALM, &ssi);
 208         if (*minor != 0)
 209             return GSS_S_FAILURE;
 210
 211         nameBuf.value = ssi;
 212         nameBuf.length = strlen(ssi);
 213
 214         major = gssEapRadiusAddAvp(minor, vps,
 215                                    PW_GSS_ACCEPTOR_SERVICE_SPECIFIC,
 216                                    VENDORPEC_UKERNA,
 217                                    &nameBuf);
 218
 219         if (GSS_ERROR(major)) {
 220             krb5_free_unparsed_name(krbContext, ssi);
 221             return major;
 222         }
 223         krb5_free_unparsed_name(krbContext, ssi);
 224     }
 225
 226     krbDataToGssBuffer(krb5_princ_realm(krbContext, krbPrinc), &nameBuf);
 227     if (nameBuf.length != 0) {
 228         /* Acceptor-Realm-Name */
 229         major = gssEapRadiusAddAvp(minor, vps,
 230                                    PW_GSS_ACCEPTOR_REALM_NAME,
 231                                    VENDORPEC_UKERNA,
 232                                    &nameBuf);
 233         if (GSS_ERROR(major))
 234             return major;
 235     }
 236
 237     return GSS_S_COMPLETE;
 238 }
 239
 240 static OM_uint32
 241 createRadiusHandle(OM_uint32 *minor,
 242                    gss_cred_id_t cred,
 243                    gss_ctx_id_t ctx)
 244 {
 245     struct gss_eap_acceptor_ctx *actx = &ctx->acceptorCtx;
 246     const char *configFile = RS_CONFIG_FILE;
 247     const char *configStanza = "gss-eap";
 248     struct rs_alloc_scheme ralloc;
 249     struct rs_error *err;
 250
 251     assert(actx->radHandle == NULL);
 252     assert(actx->radConn == NULL);
 253
 254     if (rs_context_create(&actx->radHandle, RS_DICT_FILE) != 0) {
 255         *minor = GSSEAP_RADSEC_INIT_FAILURE;
 256         return GSS_S_FAILURE;
 257     }
 258
 259     if (cred != GSS_C_NO_CREDENTIAL) {
 260         if (cred->radiusConfigFile != NULL)
 261             configFile = cred->radiusConfigFile;
 262         if (cred->radiusConfigStanza != NULL)
 263             configStanza = cred->radiusConfigStanza;
 264     }
 265
 266     ralloc.calloc  = GSSEAP_CALLOC;
 267     ralloc.malloc  = GSSEAP_MALLOC;
 268     ralloc.free    = GSSEAP_FREE;
 269     ralloc.realloc = GSSEAP_REALLOC;
 270
 271     rs_context_set_alloc_scheme(actx->radHandle, &ralloc);
 272
 273     if (rs_context_read_config(actx->radHandle, configFile) != 0) {
 274         err = rs_err_ctx_pop(actx->radHandle);
 275         goto fail;
 276     }
 277
 278     if (rs_conn_create(actx->radHandle, &actx->radConn, configStanza) != 0) {
 279         err = rs_err_conn_pop(actx->radConn);
 280         goto fail;
 281     }
 282
 283     /* XXX TODO rs_conn_select_server does not exist yet */
 284 #if 0
 285     if (actx->radServer != NULL) {
 286         if (rs_conn_select_server(actx->radConn, actx->radServer) != 0) {
 287             err = rs_err_conn_pop(actx->radConn);
 288             goto fail;
 289         }
 290     }
 291 #endif
 292
 293     *minor = 0;
 294     return GSS_S_COMPLETE;
 295
 296 fail:
 297     return gssEapRadiusMapError(minor, err);
 298 }
 299
 300 static OM_uint32
 301 eapGssSmAcceptAuthenticate(OM_uint32 *minor,
 302                            gss_ctx_id_t ctx,
 303                            gss_cred_id_t cred,
 304                            gss_buffer_t inputToken,
 305                            gss_channel_bindings_t chanBindings,
 306                            gss_buffer_t outputToken)
 307 {
 308     OM_uint32 major, tmpMinor;
 309     struct rs_handle *rh;
 310     struct rs_connection *rconn;
 311     struct rs_request *request = NULL;
 312     struct rs_packet *req = NULL, *resp = NULL;
 313     struct radius_packet *frreq, *frresp;
 314     int sendAcceptorIdentity = 0;
 315
 316     if (ctx->acceptorCtx.radHandle == NULL) {
 317         /* May be NULL from an imported partial context */
 318         major = createRadiusHandle(minor, cred, ctx);
 319         if (GSS_ERROR(major))
 320             goto cleanup;
 321
 322         sendAcceptorIdentity = 1;
 323     }
 324
 325     rh = ctx->acceptorCtx.radHandle;
 326     rconn = ctx->acceptorCtx.radConn;
 327
 328     if (rs_packet_create_acc_request(rconn, &req, NULL, NULL) != 0) {
 329         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 330         goto cleanup;
 331     }
 332     frreq = rs_packet_frpkt(req);
 333
 334     if (sendAcceptorIdentity) {
 335         major = setAcceptorIdentity(minor, ctx, &frreq->vps);
 336         if (GSS_ERROR(major))
 337             goto cleanup;
 338     }
 339
 340     major = gssEapRadiusAddAvp(minor, &frreq->vps,
 341                                PW_EAP_MESSAGE, 0, inputToken);
 342     if (GSS_ERROR(major))
 343         goto cleanup;
 344
 345     if (ctx->acceptorCtx.state.length != 0) {
 346         major = gssEapRadiusAddAvp(minor, &frreq->vps, PW_STATE, 0,
 347                                    &ctx->acceptorCtx.state);
 348         if (GSS_ERROR(major))
 349             goto cleanup;
 350
 351         gss_release_buffer(&tmpMinor, &ctx->acceptorCtx.state);
 352     }
 353
 354     if (rs_request_create(rconn, &request) != 0 ||
 355         rs_request_send(request, req, &resp) != 0) {
 356         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 357         goto cleanup;
 358     }
 359
 360     assert(resp != NULL);
 361
 362     frresp = rs_packet_frpkt(resp);
 363     switch (frresp->code) {
 364     case PW_AUTHENTICATION_ACK:
 365     case PW_ACCESS_CHALLENGE:
 366         major = GSS_S_CONTINUE_NEEDED;
 367         break;
 368     case PW_AUTHENTICATION_REJECT:
 369         *minor = GSSEAP_PEER_AUTH_FAILURE;
 370         major = GSS_S_DEFECTIVE_CREDENTIAL;
 371         goto cleanup;
 372         break;
 373     default:
 374         major = GSS_S_FAILURE;
 375         goto cleanup;
 376         break;
 377     }
 378
 379     major = gssEapRadiusGetAvp(minor, frresp->vps, PW_EAP_MESSAGE, 0,
 380                                outputToken, TRUE);
 381     if ((major == GSS_S_UNAVAILABLE && frresp->code != PW_AUTHENTICATION_ACK) ||
 382         GSS_ERROR(major))
 383         goto cleanup;
 384
 385     if (frresp->code == PW_ACCESS_CHALLENGE) {
 386         major = gssEapRadiusGetAvp(minor, frresp->vps, PW_STATE, 0,
 387                                    &ctx->acceptorCtx.state, TRUE);
 388         if (major != GSS_S_UNAVAILABLE && GSS_ERROR(major))
 389             goto cleanup;
 390     } else {
 391         ctx->acceptorCtx.vps = frresp->vps;
 392         frresp->vps = NULL;
 393
 394         rs_conn_destroy(ctx->acceptorCtx.radConn);
 395         ctx->acceptorCtx.radConn = NULL;
 396
 397         major = acceptReadyEap(minor, ctx, cred);
 398         if (GSS_ERROR(major))
 399             goto cleanup;
 400
 401         ctx->state = EAP_STATE_EXTENSIONS_REQ;
 402     }
 403
 404     major = GSS_S_CONTINUE_NEEDED;
 405
 406 cleanup:
 407     rs_request_destroy(request);
 408
 409     return major;
 410 }
 411
 412 static OM_uint32
 413 eapGssSmAcceptExtensionsReq(OM_uint32 *minor,
 414                             gss_ctx_id_t ctx,
 415                             gss_cred_id_t cred,
 416                             gss_buffer_t inputToken,
 417                             gss_channel_bindings_t chanBindings,
 418                             gss_buffer_t outputToken)
 419 {
 420     OM_uint32 major;
 421
 422     major = gssEapVerifyExtensions(minor, cred, ctx, chanBindings, inputToken);
 423     if (GSS_ERROR(major))
 424         return major;
 425
 426     outputToken->length = 0;
 427     outputToken->value = NULL;
 428
 429     ctx->state = EAP_STATE_EXTENSIONS_RESP;
 430
 431     return GSS_S_CONTINUE_NEEDED;
 432 }
 433
 434 static OM_uint32
 435 eapGssSmAcceptExtensionsResp(OM_uint32 *minor,
 436                              gss_ctx_id_t ctx,
 437                              gss_cred_id_t cred,
 438                              gss_buffer_t inputToken,
 439                              gss_channel_bindings_t chanBindings,
 440                              gss_buffer_t outputToken)
 441 {
 442     OM_uint32 major;
 443
 444     major = gssEapMakeExtensions(minor, cred, ctx, chanBindings, outputToken);
 445     if (GSS_ERROR(major))
 446         return major;
 447
 448     ctx->state = EAP_STATE_ESTABLISHED;
 449
 450     return GSS_S_COMPLETE;
 451 }
 452
 453 static OM_uint32
 454 eapGssSmAcceptEstablished(OM_uint32 *minor,
 455                           gss_ctx_id_t ctx,
 456                           gss_cred_id_t cred,
 457                           gss_buffer_t inputToken,
 458                           gss_channel_bindings_t chanBindings,
 459                           gss_buffer_t outputToken)
 460 {
 461     /* Called with already established context */
 462     *minor = GSSEAP_CONTEXT_ESTABLISHED;
 463     return GSS_S_BAD_STATUS;
 464 }
 465
 466 static OM_uint32
 467 makeErrorToken(OM_uint32 *minor,
 468                OM_uint32 majorStatus,
 469                OM_uint32 minorStatus,
 470                gss_buffer_t outputToken)
 471 {
 472     unsigned char errorData[8];
 473     gss_buffer_desc errorBuffer;
 474
 475     store_uint32_be(majorStatus, &errorData[0]);
 476     store_uint32_be(minorStatus, &errorData[4]);
 477
 478     errorBuffer.length = sizeof(errorData);
 479     errorBuffer.value = errorData;
 480
 481     return duplicateBuffer(minor, &errorBuffer, outputToken);
 482 }
 483
 484 static struct gss_eap_acceptor_sm {
 485     enum gss_eap_token_type inputTokenType;
 486     enum gss_eap_token_type outputTokenType;
 487     OM_uint32 (*processToken)(OM_uint32 *,
 488                               gss_ctx_id_t,
 489                               gss_cred_id_t,
 490                               gss_buffer_t,
 491                               gss_channel_bindings_t,
 492                               gss_buffer_t);
 493 } eapGssAcceptorSm[] = {
 494     { TOK_TYPE_EAP_RESP,    TOK_TYPE_EAP_REQ,       eapGssSmAcceptIdentity           },
 495     { TOK_TYPE_EAP_RESP,    TOK_TYPE_EAP_REQ,       eapGssSmAcceptAuthenticate       },
 496     { TOK_TYPE_EXT_REQ,     TOK_TYPE_NONE,          eapGssSmAcceptExtensionsReq      },
 497     { TOK_TYPE_NONE,        TOK_TYPE_EXT_RESP,      eapGssSmAcceptExtensionsResp     },
 498     { TOK_TYPE_NONE,        TOK_TYPE_NONE,          eapGssSmAcceptEstablished        },
 499     { TOK_TYPE_NONE,        TOK_TYPE_CONTEXT_ERR,   NULL                             },
 500 #ifdef GSSEAP_ENABLE_REAUTH
 501     { TOK_TYPE_GSS_REAUTH,  TOK_TYPE_GSS_REAUTH,    eapGssSmAcceptGssReauth          },
 502 #endif
 503 };
 504
 505 OM_uint32
 506 gss_accept_sec_context(OM_uint32 *minor,
 507                        gss_ctx_id_t *context_handle,
 508                        gss_cred_id_t cred,
 509                        gss_buffer_t input_token,
 510                        gss_channel_bindings_t input_chan_bindings,
 511                        gss_name_t *src_name,
 512                        gss_OID *mech_type,
 513                        gss_buffer_t output_token,
 514                        OM_uint32 *ret_flags,
 515                        OM_uint32 *time_rec,
 516                        gss_cred_id_t *delegated_cred_handle)
 517 {
 518     OM_uint32 major;
 519     OM_uint32 tmpMajor, tmpMinor;
 520     gss_ctx_id_t ctx = *context_handle;
 521     struct gss_eap_acceptor_sm *sm = NULL;
 522     gss_buffer_desc innerInputToken = GSS_C_EMPTY_BUFFER;
 523     gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER;
 524     enum gss_eap_token_type tokType;
 525     int initialContextToken = 0;
 526
 527     *minor = 0;
 528
 529     output_token->length = 0;
 530     output_token->value = NULL;
 531
 532     if (input_token == GSS_C_NO_BUFFER || input_token->length == 0) {
 533         return GSS_S_DEFECTIVE_TOKEN;
 534     }
 535
 536     if (ctx == GSS_C_NO_CONTEXT) {
 537         major = gssEapAllocContext(minor, &ctx);
 538         if (GSS_ERROR(major))
 539             return major;
 540
 541         initialContextToken = 1;
 542         *context_handle = ctx;
 543     }
 544
 545     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 546
 547     /* Validate and lock credentials */
 548     if (cred != GSS_C_NO_CREDENTIAL) {
 549         GSSEAP_MUTEX_LOCK(&cred->mutex);
 550
 551         if ((cred->flags & CRED_FLAG_ACCEPT) == 0) {
 552             *minor = GSSEAP_CRED_USAGE_MISMATCH;
 553             major = GSS_S_NO_CRED;
 554             goto cleanup;
 555         }
 556     }
 557
 558     sm = &eapGssAcceptorSm[ctx->state];
 559
 560     major = gssEapVerifyToken(minor, ctx, input_token,
 561                               &tokType, &innerInputToken);
 562     if (GSS_ERROR(major))
 563         goto cleanup;
 564
 565     if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
 566         *minor = GSSEAP_WRONG_MECH;
 567         major = GSS_S_BAD_MECH;
 568         goto cleanup;
 569     }
 570
 571 #ifdef GSSEAP_ENABLE_REAUTH
 572     /*
 573      * If we're built with fast reauthentication support, it's valid
 574      * for an initiator to send a GSS reauthentication token as its
 575      * initial context token, causing us to short-circuit the state
 576      * machine and process Kerberos GSS messages instead.
 577      */
 578     if (tokType == TOK_TYPE_GSS_REAUTH && initialContextToken) {
 579         ctx->state = EAP_STATE_KRB_REAUTH_GSS;
 580     } else
 581 #endif
 582     if (tokType != sm->inputTokenType) {
 583         *minor = GSSEAP_WRONG_TOK_ID;
 584         major = GSS_S_DEFECTIVE_TOKEN;
 585         goto cleanup;
 586     }
 587
 588     do {
 589         sm = &eapGssAcceptorSm[ctx->state];
 590
 591         major = (sm->processToken)(minor,
 592                                    ctx,
 593                                    cred,
 594                                    &innerInputToken,
 595                                    input_chan_bindings,
 596                                    &innerOutputToken);
 597         if (GSS_ERROR(major)) {
 598             /* Generate an error token */
 599             tmpMajor = makeErrorToken(&tmpMinor, major, *minor, &innerOutputToken);
 600             if (GSS_ERROR(tmpMajor)) {
 601                 major = tmpMajor;
 602                 goto cleanup;
 603             }
 604
 605             sm = &eapGssAcceptorSm[EAP_STATE_ERROR];
 606             goto send_token;
 607         }
 608     } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.length == 0);
 609
 610     if (mech_type != NULL) {
 611         if (!gssEapInternalizeOid(ctx->mechanismUsed, mech_type))
 612             duplicateOid(&tmpMinor, ctx->mechanismUsed, mech_type);
 613     }
 614     if (ret_flags != NULL)
 615         *ret_flags = ctx->gssFlags;
 616     if (delegated_cred_handle != NULL)
 617         *delegated_cred_handle = GSS_C_NO_CREDENTIAL;
 618
 619     if (major == GSS_S_COMPLETE) {
 620         if (src_name != NULL && ctx->initiatorName != GSS_C_NO_NAME) {
 621             major = gssEapDuplicateName(&tmpMinor, ctx->initiatorName, src_name);
 622             if (GSS_ERROR(major))
 623                 goto cleanup;
 624         }
 625         if (time_rec != NULL)
 626             gssEapContextTime(&tmpMinor, ctx, time_rec);
 627     }
 628
 629     assert(ctx->state == EAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
 630
 631 send_token:
 632     if (innerOutputToken.value != NULL) {
 633         tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
 634                                    sm->outputTokenType, output_token);
 635         if (GSS_ERROR(tmpMajor)) {
 636             major = tmpMajor;
 637             *minor = tmpMinor;
 638             goto cleanup;
 639         }
 640     }
 641
 642 cleanup:
 643     if (cred != GSS_C_NO_CREDENTIAL)
 644         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
 645     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 646
 647     if (GSS_ERROR(major))
 648         gssEapReleaseContext(&tmpMinor, context_handle);
 649
 650     gss_release_buffer(&tmpMinor, &innerOutputToken);
 651
 652     return major;
 653 }
 654
 655 #ifdef GSSEAP_ENABLE_REAUTH
 656 static OM_uint32
 657 acceptReadyKrb(OM_uint32 *minor,
 658                gss_ctx_id_t ctx,
 659                gss_cred_id_t cred,
 660                const gss_name_t initiator,
 661                const gss_OID mech,
 662                OM_uint32 timeRec)
 663 {
 664     OM_uint32 major;
 665
 666     major = gssEapGlueToMechName(minor, initiator, &ctx->initiatorName);
 667     if (GSS_ERROR(major))
 668         return major;
 669
 670     if (cred != GSS_C_NO_CREDENTIAL && cred->name != GSS_C_NO_NAME) {
 671         major = gssEapDuplicateName(minor, cred->name, &ctx->acceptorName);
 672         if (GSS_ERROR(major))
 673             return major;
 674     }
 675
 676     major = gssEapReauthComplete(minor, ctx, cred, mech, timeRec);
 677     if (GSS_ERROR(major))
 678         return major;
 679
 680     ctx->state = EAP_STATE_ESTABLISHED;
 681
 682     return GSS_S_COMPLETE;
 683 }
 684
 685 static OM_uint32
 686 eapGssSmAcceptGssReauth(OM_uint32 *minor,
 687                         gss_ctx_id_t ctx,
 688                         gss_cred_id_t cred,
 689                         gss_buffer_t inputToken,
 690                         gss_channel_bindings_t chanBindings,
 691                         gss_buffer_t outputToken)
 692 {
 693     OM_uint32 major, tmpMinor;
 694     gss_cred_id_t krbCred = GSS_C_NO_CREDENTIAL;
 695     gss_name_t krbInitiator = GSS_C_NO_NAME;
 696     gss_OID mech = GSS_C_NO_OID;
 697     OM_uint32 gssFlags, timeRec = GSS_C_INDEFINITE;
 698
 699     ctx->flags |= CTX_FLAG_KRB_REAUTH_GSS;
 700
 701     if (cred != GSS_C_NO_CREDENTIAL)
 702         krbCred = cred->krbCred;
 703
 704     major = gssAcceptSecContext(minor,
 705                                 &ctx->kerberosCtx,
 706                                 krbCred,
 707                                 inputToken,
 708                                 chanBindings,
 709                                 &krbInitiator,
 710                                 &mech,
 711                                 outputToken,
 712                                 &gssFlags,
 713                                 &timeRec,
 714                                 NULL);
 715     if (major == GSS_S_COMPLETE) {
 716         major = acceptReadyKrb(minor, ctx, cred,
 717                                krbInitiator, mech, timeRec);
 718     }
 719
 720     ctx->gssFlags = gssFlags;
 721
 722     gssReleaseName(&tmpMinor, &krbInitiator);
 723
 724     return major;
 725 }
 726 #endif /* GSSEAP_ENABLE_REAUTH */