accept_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 acceptor (server). These functions
  35  * wrap around libradsec and (thus) talk to a RADIUS server or proxy.
  36  */
  37
  38 #include "gssapiP_eap.h"
  39
  40 #ifdef GSSEAP_ENABLE_REAUTH
  41 static OM_uint32
  42 eapGssSmAcceptGssReauth(OM_uint32 *minor,
  43                         gss_cred_id_t cred,
  44                         gss_ctx_id_t ctx,
  45                         gss_name_t target __attribute__((__unused__)),
  46                         gss_OID mech __attribute__((__unused__)),
  47                         OM_uint32 reqFlags __attribute__((__unused__)),
  48                         OM_uint32 timeReq __attribute__((__unused__)),
  49                         gss_channel_bindings_t chanBindings,
  50                         gss_buffer_t inputToken,
  51                         gss_buffer_t outputToken,
  52                         OM_uint32 *smFlags);
  53 #endif
  54
  55 /*
  56  * Mark an acceptor context as ready for cryptographic operations
  57  */
  58 static OM_uint32
  59 acceptReadyEap(OM_uint32 *minor, gss_ctx_id_t ctx, gss_cred_id_t cred)
  60 {
  61     OM_uint32 major, tmpMinor;
  62     VALUE_PAIR *vp;
  63     gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
  64
  65     /* Cache encryption type derived from selected mechanism OID */
  66     major = gssEapOidToEnctype(minor, ctx->mechanismUsed,
  67                                &ctx->encryptionType);
  68     if (GSS_ERROR(major))
  69         return major;
  70
  71     gssEapReleaseName(&tmpMinor, &ctx->initiatorName);
  72
  73     major = gssEapRadiusGetRawAvp(minor, ctx->acceptorCtx.vps,
  74                                   PW_USER_NAME, 0, &vp);
  75     if (major == GSS_S_COMPLETE) {
  76         nameBuf.length = vp->length;
  77         nameBuf.value = vp->vp_strvalue;
  78     } else {
  79         ctx->gssFlags |= GSS_C_ANON_FLAG;
  80     }
  81
  82     major = gssEapImportName(minor, &nameBuf,
  83                              (ctx->gssFlags & GSS_C_ANON_FLAG) ?
  84                                 GSS_C_NT_ANONYMOUS : GSS_C_NT_USER_NAME,
  85                              &ctx->initiatorName);
  86     if (GSS_ERROR(major))
  87         return major;
  88
  89     major = gssEapRadiusGetRawAvp(minor, ctx->acceptorCtx.vps,
  90                                   PW_MS_MPPE_SEND_KEY, VENDORPEC_MS, &vp);
  91     if (GSS_ERROR(major)) {
  92         *minor = GSSEAP_KEY_UNAVAILABLE;
  93         return GSS_S_UNAVAILABLE;
  94     }
  95
  96     major = gssEapDeriveRfc3961Key(minor,
  97                                    vp->vp_octets,
  98                                    vp->length,
  99                                    ctx->encryptionType,
 100                                    &ctx->rfc3961Key);
 101     if (GSS_ERROR(major))
 102         return major;
 103
 104     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 105                                        &ctx->checksumType);
 106     if (GSS_ERROR(major))
 107         return major;
 108
 109     major = sequenceInit(minor,
 110                          &ctx->seqState, ctx->recvSeq,
 111                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 112                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 113                          TRUE);
 114     if (GSS_ERROR(major))
 115         return major;
 116
 117     major = gssEapCreateAttrContext(minor, cred, ctx,
 118                                     &ctx->initiatorName->attrCtx,
 119                                     &ctx->expiryTime);
 120     if (GSS_ERROR(major))
 121         return major;
 122
 123     *minor = 0;
 124     return GSS_S_COMPLETE;
 125 }
 126
 127 #ifdef GSSEAP_DEBUG
 128 static OM_uint32
 129 eapGssSmAcceptVendorInfo(OM_uint32 *minor,
 130                          gss_cred_id_t cred,
 131                          gss_ctx_id_t ctx,
 132                          gss_name_t target,
 133                          gss_OID mech,
 134                          OM_uint32 reqFlags,
 135                          OM_uint32 timeReq,
 136                          gss_channel_bindings_t chanBindings,
 137                          gss_buffer_t inputToken,
 138                          gss_buffer_t outputToken,
 139                          OM_uint32 *smFlags)
 140 {
 141     fprintf(stderr, "GSS-EAP: vendor: %.*s\n",
 142             (int)inputToken->length, (char *)inputToken->value);
 143
 144     return GSS_S_CONTINUE_NEEDED;
 145 }
 146 #endif
 147
 148
 149 /*
 150  * Emit a identity EAP request to force the initiator (peer) to identify
 151  * itself.
 152  */
 153 static OM_uint32
 154 eapGssSmAcceptIdentity(OM_uint32 *minor,
 155                        gss_cred_id_t cred,
 156                        gss_ctx_id_t ctx,
 157                        gss_name_t target __attribute__((__unused__)),
 158                        gss_OID mech __attribute__((__unused__)),
 159                        OM_uint32 reqFlags __attribute__((__unused__)),
 160                        OM_uint32 timeReq __attribute__((__unused__)),
 161                        gss_channel_bindings_t chanBindings __attribute__((__unused__)),
 162                        gss_buffer_t inputToken,
 163                        gss_buffer_t outputToken,
 164                        OM_uint32 *smFlags)
 165 {
 166     OM_uint32 major;
 167     struct wpabuf *reqData;
 168     gss_buffer_desc pktBuffer;
 169
 170     if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
 171         *minor = GSSEAP_CRED_MECH_MISMATCH;
 172         return GSS_S_BAD_MECH;
 173     }
 174
 175     if (inputToken != GSS_C_NO_BUFFER && inputToken->length != 0) {
 176         *minor = GSSEAP_WRONG_SIZE;
 177         return GSS_S_DEFECTIVE_TOKEN;
 178     }
 179
 180     assert(ctx->acceptorName == GSS_C_NO_NAME);
 181
 182     if (cred->name != GSS_C_NO_NAME) {
 183         major = gssEapDuplicateName(minor, cred->name, &ctx->acceptorName);
 184         if (GSS_ERROR(major))
 185             return major;
 186     }
 187
 188     reqData = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY, 0,
 189                             EAP_CODE_REQUEST, 0);
 190     if (reqData == NULL) {
 191         *minor = ENOMEM;
 192         return GSS_S_FAILURE;
 193     }
 194
 195     pktBuffer.length = wpabuf_len(reqData);
 196     pktBuffer.value = (void *)wpabuf_head(reqData);
 197
 198     major = duplicateBuffer(minor, &pktBuffer, outputToken);
 199     if (GSS_ERROR(major))
 200         return major;
 201
 202     wpabuf_free(reqData);
 203
 204     GSSEAP_SM_TRANSITION_NEXT(ctx);
 205
 206     *minor = 0;
 207
 208     return GSS_S_CONTINUE_NEEDED;
 209 }
 210
 211 /*
 212  * Returns TRUE if the input token contains an EAP identity response.
 213  */
 214 static int
 215 isIdentityResponseP(gss_buffer_t inputToken)
 216 {
 217     struct wpabuf respData;
 218
 219     wpabuf_set(&respData, inputToken->value, inputToken->length);
 220
 221     return (eap_get_type(&respData) == EAP_TYPE_IDENTITY);
 222 }
 223
 224 /*
 225  * Save the asserted initiator identity from the EAP identity response.
 226  */
 227 static OM_uint32
 228 importInitiatorIdentity(OM_uint32 *minor,
 229                         gss_ctx_id_t ctx,
 230                         gss_buffer_t inputToken)
 231 {
 232     OM_uint32 tmpMinor;
 233     struct wpabuf respData;
 234     const unsigned char *pos;
 235     size_t len;
 236     gss_buffer_desc nameBuf;
 237
 238     wpabuf_set(&respData, inputToken->value, inputToken->length);
 239
 240     pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY,
 241                            &respData, &len);
 242     if (pos == NULL) {
 243         *minor = GSSEAP_PEER_BAD_MESSAGE;
 244         return GSS_S_DEFECTIVE_TOKEN;
 245     }
 246
 247     nameBuf.value = (void *)pos;
 248     nameBuf.length = len;
 249
 250     gssEapReleaseName(&tmpMinor, &ctx->initiatorName);
 251
 252     return gssEapImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
 253                             &ctx->initiatorName);
 254 }
 255
 256 /*
 257  * Pass the asserted initiator identity to the authentication server.
 258  */
 259 static OM_uint32
 260 setInitiatorIdentity(OM_uint32 *minor,
 261                      gss_ctx_id_t ctx,
 262                      VALUE_PAIR **vps)
 263 {
 264     OM_uint32 major, tmpMinor;
 265     gss_buffer_desc nameBuf;
 266
 267     /*
 268      * We should have got an EAP identity response, but if we didn't, then
 269      * we will just avoid sending User-Name. Note that radsecproxy requires
 270      * User-Name to be sent on every request (presumably so it can remain
 271      * stateless).
 272      */
 273     if (ctx->initiatorName != GSS_C_NO_NAME) {
 274         major = gssEapDisplayName(minor, ctx->initiatorName, &nameBuf, NULL);
 275         if (GSS_ERROR(major))
 276             return major;
 277
 278         major = gssEapRadiusAddAvp(minor, vps, PW_USER_NAME, 0, &nameBuf);
 279         if (GSS_ERROR(major))
 280             return major;
 281
 282         gss_release_buffer(&tmpMinor, &nameBuf);
 283     }
 284
 285     *minor = 0;
 286     return GSS_S_COMPLETE;
 287 }
 288
 289 /*
 290  * Pass the asserted acceptor identity to the authentication server.
 291  */
 292 static OM_uint32
 293 setAcceptorIdentity(OM_uint32 *minor,
 294                     gss_ctx_id_t ctx,
 295                     VALUE_PAIR **vps)
 296 {
 297     OM_uint32 major;
 298     gss_buffer_desc nameBuf;
 299     krb5_context krbContext = NULL;
 300     krb5_principal krbPrinc;
 301     struct rs_context *rc = ctx->acceptorCtx.radContext;
 302
 303     assert(rc != NULL);
 304
 305     if (ctx->acceptorName == GSS_C_NO_NAME) {
 306         *minor = 0;
 307         return GSS_S_COMPLETE;
 308     }
 309
 310     if ((ctx->acceptorName->flags & NAME_FLAG_SERVICE) == 0) {
 311         *minor = GSSEAP_BAD_SERVICE_NAME;
 312         return GSS_S_BAD_NAME;
 313     }
 314
 315     GSSEAP_KRB_INIT(&krbContext);
 316
 317     krbPrinc = ctx->acceptorName->krbPrincipal;
 318     assert(krbPrinc != NULL);
 319     assert(KRB_PRINC_LENGTH(krbPrinc) >= 2);
 320
 321     /* Acceptor-Service-Name */
 322     krbPrincComponentToGssBuffer(krbPrinc, 0, &nameBuf);
 323
 324     major = gssEapRadiusAddAvp(minor, vps,
 325                                PW_GSS_ACCEPTOR_SERVICE_NAME,
 326                                VENDORPEC_UKERNA,
 327                                &nameBuf);
 328     if (GSS_ERROR(major))
 329         return major;
 330
 331     /* Acceptor-Host-Name */
 332     krbPrincComponentToGssBuffer(krbPrinc, 1, &nameBuf);
 333
 334     major = gssEapRadiusAddAvp(minor, vps,
 335                                PW_GSS_ACCEPTOR_HOST_NAME,
 336                                VENDORPEC_UKERNA,
 337                                &nameBuf);
 338     if (GSS_ERROR(major))
 339         return major;
 340
 341     if (KRB_PRINC_LENGTH(krbPrinc) > 2) {
 342         /* Acceptor-Service-Specific */
 343         krb5_principal_data ssiPrinc = *krbPrinc;
 344         char *ssi;
 345
 346         KRB_PRINC_LENGTH(&ssiPrinc) -= 2;
 347         KRB_PRINC_NAME(&ssiPrinc) += 2;
 348
 349         *minor = krb5_unparse_name_flags(krbContext, &ssiPrinc,
 350                                          KRB5_PRINCIPAL_UNPARSE_NO_REALM, &ssi);
 351         if (*minor != 0)
 352             return GSS_S_FAILURE;
 353
 354         nameBuf.value = ssi;
 355         nameBuf.length = strlen(ssi);
 356
 357         major = gssEapRadiusAddAvp(minor, vps,
 358                                    PW_GSS_ACCEPTOR_SERVICE_SPECIFIC,
 359                                    VENDORPEC_UKERNA,
 360                                    &nameBuf);
 361
 362         if (GSS_ERROR(major)) {
 363             krb5_free_unparsed_name(krbContext, ssi);
 364             return major;
 365         }
 366         krb5_free_unparsed_name(krbContext, ssi);
 367     }
 368
 369     krbPrincRealmToGssBuffer(krbPrinc, &nameBuf);
 370     if (nameBuf.length != 0) {
 371         /* Acceptor-Realm-Name */
 372         major = gssEapRadiusAddAvp(minor, vps,
 373                                    PW_GSS_ACCEPTOR_REALM_NAME,
 374                                    VENDORPEC_UKERNA,
 375                                    &nameBuf);
 376         if (GSS_ERROR(major))
 377             return major;
 378     }
 379
 380     *minor = 0;
 381     return GSS_S_COMPLETE;
 382 }
 383
 384 /*
 385  * Allocate a RadSec handle
 386  */
 387 static OM_uint32
 388 createRadiusHandle(OM_uint32 *minor,
 389                    gss_cred_id_t cred,
 390                    gss_ctx_id_t ctx)
 391 {
 392     struct gss_eap_acceptor_ctx *actx = &ctx->acceptorCtx;
 393     const char *configFile = RS_CONFIG_FILE;
 394     const char *configStanza = "gss-eap";
 395     struct rs_alloc_scheme ralloc;
 396     struct rs_error *err;
 397
 398     assert(actx->radContext == NULL);
 399     assert(actx->radConn == NULL);
 400
 401     if (rs_context_create(&actx->radContext, RS_DICT_FILE) != 0) {
 402         *minor = GSSEAP_RADSEC_CONTEXT_FAILURE;
 403         return GSS_S_FAILURE;
 404     }
 405
 406     if (cred->radiusConfigFile != NULL)
 407         configFile = cred->radiusConfigFile;
 408     if (cred->radiusConfigStanza != NULL)
 409         configStanza = cred->radiusConfigStanza;
 410
 411     ralloc.calloc  = GSSEAP_CALLOC;
 412     ralloc.malloc  = GSSEAP_MALLOC;
 413     ralloc.free    = GSSEAP_FREE;
 414     ralloc.realloc = GSSEAP_REALLOC;
 415
 416     rs_context_set_alloc_scheme(actx->radContext, &ralloc);
 417
 418     if (rs_context_read_config(actx->radContext, configFile) != 0) {
 419         err = rs_err_ctx_pop(actx->radContext);
 420         goto fail;
 421     }
 422
 423     if (rs_conn_create(actx->radContext, &actx->radConn, configStanza) != 0) {
 424         err = rs_err_conn_pop(actx->radConn);
 425         goto fail;
 426     }
 427
 428     if (actx->radServer != NULL) {
 429         if (rs_conn_select_peer(actx->radConn, actx->radServer) != 0) {
 430             err = rs_err_conn_pop(actx->radConn);
 431             goto fail;
 432         }
 433     }
 434
 435     *minor = 0;
 436     return GSS_S_COMPLETE;
 437
 438 fail:
 439     return gssEapRadiusMapError(minor, err);
 440 }
 441
 442 /*
 443  * Process a EAP response from the initiator.
 444  */
 445 static OM_uint32
 446 eapGssSmAcceptAuthenticate(OM_uint32 *minor,
 447                            gss_cred_id_t cred,
 448                            gss_ctx_id_t ctx,
 449                            gss_name_t target __attribute__((__unused__)),
 450                            gss_OID mech __attribute__((__unused__)),
 451                            OM_uint32 reqFlags __attribute__((__unused__)),
 452                            OM_uint32 timeReq __attribute__((__unused__)),
 453                            gss_channel_bindings_t chanBindings,
 454                            gss_buffer_t inputToken,
 455                            gss_buffer_t outputToken,
 456                            OM_uint32 *smFlags)
 457 {
 458     OM_uint32 major, tmpMinor;
 459     struct rs_connection *rconn;
 460     struct rs_request *request = NULL;
 461     struct rs_packet *req = NULL, *resp = NULL;
 462     struct radius_packet *frreq, *frresp;
 463
 464     if (ctx->acceptorCtx.radContext == NULL) {
 465         /* May be NULL from an imported partial context */
 466         major = createRadiusHandle(minor, cred, ctx);
 467         if (GSS_ERROR(major))
 468             goto cleanup;
 469     }
 470
 471     if (isIdentityResponseP(inputToken)) {
 472         major = importInitiatorIdentity(minor, ctx, inputToken);
 473         if (GSS_ERROR(major))
 474             return major;
 475     }
 476
 477     rconn = ctx->acceptorCtx.radConn;
 478
 479     if (rs_packet_create_authn_request(rconn, &req, NULL, NULL) != 0) {
 480         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 481         goto cleanup;
 482     }
 483     frreq = rs_packet_frpkt(req);
 484
 485     major = setInitiatorIdentity(minor, ctx, &frreq->vps);
 486     if (GSS_ERROR(major))
 487         goto cleanup;
 488
 489     major = setAcceptorIdentity(minor, ctx, &frreq->vps);
 490     if (GSS_ERROR(major))
 491         goto cleanup;
 492
 493     major = gssEapRadiusAddAvp(minor, &frreq->vps,
 494                                PW_EAP_MESSAGE, 0, inputToken);
 495     if (GSS_ERROR(major))
 496         goto cleanup;
 497
 498     if (ctx->acceptorCtx.state.length != 0) {
 499         major = gssEapRadiusAddAvp(minor, &frreq->vps, PW_STATE, 0,
 500                                    &ctx->acceptorCtx.state);
 501         if (GSS_ERROR(major))
 502             goto cleanup;
 503
 504         gss_release_buffer(&tmpMinor, &ctx->acceptorCtx.state);
 505     }
 506
 507     if (rs_request_create(rconn, &request) != 0) {
 508         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 509         goto cleanup;
 510     }
 511
 512     rs_request_add_reqpkt(request, req);
 513     req = NULL;
 514
 515     if (rs_request_send(request, &resp) != 0) {
 516         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 517         goto cleanup;
 518     }
 519
 520     assert(resp != NULL);
 521
 522     frresp = rs_packet_frpkt(resp);
 523     switch (frresp->code) {
 524     case PW_AUTHENTICATION_ACK:
 525     case PW_ACCESS_CHALLENGE:
 526         break;
 527     case PW_AUTHENTICATION_REJECT:
 528         *minor = GSSEAP_RADIUS_AUTH_FAILURE;
 529         major = GSS_S_DEFECTIVE_CREDENTIAL;
 530         goto cleanup;
 531         break;
 532     default:
 533         *minor = GSSEAP_UNKNOWN_RADIUS_CODE;
 534         major = GSS_S_FAILURE;
 535         goto cleanup;
 536         break;
 537     }
 538
 539     major = gssEapRadiusGetAvp(minor, frresp->vps, PW_EAP_MESSAGE, 0,
 540                                outputToken, TRUE);
 541     if (major == GSS_S_UNAVAILABLE && frresp->code == PW_ACCESS_CHALLENGE) {
 542         *minor = GSSEAP_MISSING_EAP_REQUEST;
 543         major = GSS_S_DEFECTIVE_TOKEN;
 544         goto cleanup;
 545     } else if (GSS_ERROR(major))
 546         goto cleanup;
 547
 548     if (frresp->code == PW_ACCESS_CHALLENGE) {
 549         major = gssEapRadiusGetAvp(minor, frresp->vps, PW_STATE, 0,
 550                                    &ctx->acceptorCtx.state, TRUE);
 551         if (GSS_ERROR(major) && *minor != GSSEAP_NO_SUCH_ATTR)
 552             goto cleanup;
 553     } else {
 554         ctx->acceptorCtx.vps = frresp->vps;
 555         frresp->vps = NULL;
 556
 557         rs_conn_destroy(ctx->acceptorCtx.radConn);
 558         ctx->acceptorCtx.radConn = NULL;
 559
 560         major = acceptReadyEap(minor, ctx, cred);
 561         if (GSS_ERROR(major))
 562             goto cleanup;
 563
 564         GSSEAP_SM_TRANSITION_NEXT(ctx);
 565     }
 566
 567     major = GSS_S_CONTINUE_NEEDED;
 568     *minor = 0;
 569
 570 cleanup:
 571     if (request != NULL)
 572         rs_request_destroy(request);
 573     if (req != NULL)
 574         rs_packet_destroy(req);
 575
 576     return major;
 577 }
 578
 579 static OM_uint32
 580 eapGssSmAcceptGssChannelBindings(OM_uint32 *minor,
 581                                  gss_cred_id_t cred,
 582                                  gss_ctx_id_t ctx,
 583                                  gss_name_t target __attribute__((__unused__)),
 584                                  gss_OID mech __attribute__((__unused__)),
 585                                  OM_uint32 reqFlags __attribute__((__unused__)),
 586                                  OM_uint32 timeReq __attribute__((__unused__)),
 587                                  gss_channel_bindings_t chanBindings,
 588                                  gss_buffer_t inputToken,
 589                                  gss_buffer_t outputToken,
 590                                  OM_uint32 *smFlags)
 591 {
 592     OM_uint32 major, tmpMinor;
 593     gss_iov_buffer_desc iov[2];
 594
 595     iov[0].type = GSS_IOV_BUFFER_TYPE_DATA | GSS_IOV_BUFFER_FLAG_ALLOCATE;
 596     iov[0].buffer.length = 0;
 597     iov[0].buffer.value = NULL;
 598
 599     iov[1].type = GSS_IOV_BUFFER_TYPE_STREAM;
 600     iov[1].buffer = *inputToken;
 601
 602     major = gssEapUnwrapOrVerifyMIC(minor, ctx, NULL, NULL,
 603                                     iov, 2, TOK_TYPE_WRAP);
 604     if (GSS_ERROR(major))
 605         return GSS_S_BAD_BINDINGS;
 606
 607     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS &&
 608         !bufferEqual(&iov[0].buffer, &chanBindings->application_data)) {
 609         major = GSS_S_BAD_BINDINGS;
 610         *minor = GSSEAP_BINDINGS_MISMATCH;
 611     } else {
 612         major = GSS_S_CONTINUE_NEEDED;
 613         *minor = 0;
 614     }
 615
 616     gss_release_buffer(&tmpMinor, &iov[0].buffer);
 617
 618     return major;
 619 }
 620
 621 #ifdef GSSEAP_ENABLE_REAUTH
 622 static OM_uint32
 623 eapGssSmAcceptReauthCreds(OM_uint32 *minor,
 624                           gss_cred_id_t cred,
 625                           gss_ctx_id_t ctx,
 626                           gss_name_t target __attribute__((__unused__)),
 627                           gss_OID mech __attribute__((__unused__)),
 628                           OM_uint32 reqFlags __attribute__((__unused__)),
 629                           OM_uint32 timeReq __attribute__((__unused__)),
 630                           gss_channel_bindings_t chanBindings __attribute__((__unused__)),
 631                           gss_buffer_t inputToken,
 632                           gss_buffer_t outputToken,
 633                           OM_uint32 *smFlags)
 634 {
 635     OM_uint32 major;
 636
 637     /*
 638      * If we're built with fast reauthentication enabled, then
 639      * fabricate a ticket from the initiator to ourselves.
 640      */
 641     major = gssEapMakeReauthCreds(minor, ctx, cred, outputToken);
 642     if (major == GSS_S_UNAVAILABLE)
 643         major = GSS_S_COMPLETE;
 644     if (major == GSS_S_COMPLETE)
 645         major = GSS_S_CONTINUE_NEEDED;
 646
 647     return major;
 648 }
 649 #endif
 650
 651 static OM_uint32
 652 eapGssSmAcceptCompleteInitiatorExts(OM_uint32 *minor,
 653                                     gss_cred_id_t cred,
 654                                     gss_ctx_id_t ctx,
 655                                     gss_name_t target,
 656                                     gss_OID mech,
 657                                     OM_uint32 reqFlags,
 658                                     OM_uint32 timeReq,
 659                                     gss_channel_bindings_t chanBindings,
 660                                     gss_buffer_t inputToken,
 661                                     gss_buffer_t outputToken,
 662                                     OM_uint32 *smFlags)
 663 {
 664     GSSEAP_SM_TRANSITION_NEXT(ctx);
 665
 666     *minor = 0;
 667
 668     return GSS_S_CONTINUE_NEEDED;
 669 }
 670
 671 static OM_uint32
 672 eapGssSmAcceptCompleteAcceptorExts(OM_uint32 *minor,
 673                                    gss_cred_id_t cred,
 674                                    gss_ctx_id_t ctx,
 675                                    gss_name_t target,
 676                                    gss_OID mech,
 677                                    OM_uint32 reqFlags,
 678                                    OM_uint32 timeReq,
 679                                    gss_channel_bindings_t chanBindings,
 680                                    gss_buffer_t inputToken,
 681                                    gss_buffer_t outputToken,
 682                                    OM_uint32 *smFlags)
 683 {
 684     GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 685
 686     *minor = 0;
 687     *smFlags |= SM_FLAG_FORCE_SEND_TOKEN;
 688
 689     return GSS_S_COMPLETE;
 690 }
 691
 692 static struct gss_eap_sm eapGssAcceptorSm[] = {
 693 #ifdef GSSEAP_DEBUG
 694     {
 695         ITOK_TYPE_VENDOR_INFO,
 696         ITOK_TYPE_NONE,
 697         GSSEAP_STATE_INITIAL,
 698         0,
 699         eapGssSmAcceptVendorInfo,
 700     },
 701 #endif
 702 #ifdef GSSEAP_ENABLE_REAUTH
 703     {
 704         ITOK_TYPE_REAUTH_REQ,
 705         ITOK_TYPE_REAUTH_RESP,
 706         GSSEAP_STATE_INITIAL,
 707         0,
 708         eapGssSmAcceptGssReauth,
 709     },
 710 #endif
 711     {
 712         ITOK_TYPE_NONE,
 713         ITOK_TYPE_EAP_REQ,
 714         GSSEAP_STATE_INITIAL,
 715         SM_ITOK_FLAG_CRITICAL | SM_ITOK_FLAG_REQUIRED,
 716         eapGssSmAcceptIdentity,
 717     },
 718     {
 719         ITOK_TYPE_EAP_RESP,
 720         ITOK_TYPE_EAP_REQ,
 721         GSSEAP_STATE_AUTHENTICATE,
 722         SM_ITOK_FLAG_CRITICAL | SM_ITOK_FLAG_REQUIRED,
 723         eapGssSmAcceptAuthenticate
 724     },
 725     {
 726         ITOK_TYPE_GSS_CHANNEL_BINDINGS,
 727         ITOK_TYPE_NONE,
 728         GSSEAP_STATE_INITIATOR_EXTS,
 729         SM_ITOK_FLAG_CRITICAL | SM_ITOK_FLAG_REQUIRED,
 730         eapGssSmAcceptGssChannelBindings,
 731     },
 732     {
 733         ITOK_TYPE_NONE,
 734         ITOK_TYPE_NONE,
 735         GSSEAP_STATE_INITIATOR_EXTS,
 736         0,
 737         eapGssSmAcceptCompleteInitiatorExts,
 738     },
 739 #ifdef GSSEAP_ENABLE_REAUTH
 740     {
 741         ITOK_TYPE_NONE,
 742         ITOK_TYPE_REAUTH_CREDS,
 743         GSSEAP_STATE_ACCEPTOR_EXTS,
 744         0,
 745         eapGssSmAcceptReauthCreds,
 746     },
 747 #endif
 748     {
 749         ITOK_TYPE_NONE,
 750         ITOK_TYPE_NONE,
 751         GSSEAP_STATE_ACCEPTOR_EXTS,
 752         0,
 753         eapGssSmAcceptCompleteAcceptorExts
 754     },
 755 };
 756
 757 OM_uint32
 758 gss_accept_sec_context(OM_uint32 *minor,
 759                        gss_ctx_id_t *context_handle,
 760                        gss_cred_id_t cred,
 761                        gss_buffer_t input_token,
 762                        gss_channel_bindings_t input_chan_bindings,
 763                        gss_name_t *src_name,
 764                        gss_OID *mech_type,
 765                        gss_buffer_t output_token,
 766                        OM_uint32 *ret_flags,
 767                        OM_uint32 *time_rec,
 768                        gss_cred_id_t *delegated_cred_handle)
 769 {
 770     OM_uint32 major, tmpMinor;
 771     gss_ctx_id_t ctx = *context_handle;
 772
 773     *minor = 0;
 774
 775     output_token->length = 0;
 776     output_token->value = NULL;
 777
 778     if (src_name != NULL)
 779         *src_name = GSS_C_NO_NAME;
 780
 781     if (input_token == GSS_C_NO_BUFFER || input_token->length == 0) {
 782         *minor = GSSEAP_TOK_TRUNC;
 783         return GSS_S_DEFECTIVE_TOKEN;
 784     }
 785
 786     if (ctx == GSS_C_NO_CONTEXT) {
 787         major = gssEapAllocContext(minor, &ctx);
 788         if (GSS_ERROR(major))
 789             return major;
 790
 791         *context_handle = ctx;
 792     }
 793
 794     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 795
 796     if (cred == GSS_C_NO_CREDENTIAL) {
 797         if (ctx->defaultCred == GSS_C_NO_CREDENTIAL) {
 798             major = gssEapAcquireCred(minor,
 799                                       GSS_C_NO_NAME,
 800                                       GSS_C_NO_BUFFER,
 801                                       GSS_C_INDEFINITE,
 802                                       GSS_C_NO_OID_SET,
 803                                       GSS_C_ACCEPT,
 804                                       &ctx->defaultCred,
 805                                       NULL,
 806                                       NULL);
 807             if (GSS_ERROR(major))
 808                 goto cleanup;
 809         }
 810
 811         cred = ctx->defaultCred;
 812     }
 813
 814     GSSEAP_MUTEX_LOCK(&cred->mutex);
 815
 816     major = gssEapSmStep(minor,
 817                          cred,
 818                          ctx,
 819                          GSS_C_NO_NAME,
 820                          GSS_C_NO_OID,
 821                          0,
 822                          GSS_C_INDEFINITE,
 823                          input_chan_bindings,
 824                          input_token,
 825                          output_token,
 826                          eapGssAcceptorSm,
 827                          sizeof(eapGssAcceptorSm) / sizeof(eapGssAcceptorSm[0]));
 828     if (GSS_ERROR(major))
 829         goto cleanup;
 830
 831     if (mech_type != NULL) {
 832         if (!gssEapInternalizeOid(ctx->mechanismUsed, mech_type))
 833             duplicateOid(&tmpMinor, ctx->mechanismUsed, mech_type);
 834     }
 835     if (ret_flags != NULL)
 836         *ret_flags = ctx->gssFlags;
 837     if (delegated_cred_handle != NULL)
 838         *delegated_cred_handle = GSS_C_NO_CREDENTIAL;
 839
 840     if (major == GSS_S_COMPLETE) {
 841         if (src_name != NULL && ctx->initiatorName != GSS_C_NO_NAME) {
 842             major = gssEapDuplicateName(&tmpMinor, ctx->initiatorName, src_name);
 843             if (GSS_ERROR(major))
 844                 goto cleanup;
 845         }
 846         if (time_rec != NULL) {
 847             major = gssEapContextTime(&tmpMinor, ctx, time_rec);
 848             if (GSS_ERROR(major))
 849                 goto cleanup;
 850         }
 851     }
 852
 853     assert(CTX_IS_ESTABLISHED(ctx) || major == GSS_S_CONTINUE_NEEDED);
 854
 855 cleanup:
 856     if (cred != GSS_C_NO_CREDENTIAL)
 857         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
 858     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 859
 860     if (GSS_ERROR(major))
 861         gssEapReleaseContext(&tmpMinor, context_handle);
 862
 863     return major;
 864 }
 865
 866 #ifdef GSSEAP_ENABLE_REAUTH
 867 static OM_uint32
 868 acceptReadyKrb(OM_uint32 *minor,
 869                gss_ctx_id_t ctx,
 870                gss_cred_id_t cred,
 871                const gss_name_t initiator,
 872                const gss_OID mech,
 873                OM_uint32 timeRec)
 874 {
 875     OM_uint32 major;
 876
 877     major = gssEapGlueToMechName(minor, ctx, initiator, &ctx->initiatorName);
 878     if (GSS_ERROR(major))
 879         return major;
 880
 881     if (cred->name != GSS_C_NO_NAME) {
 882         major = gssEapDuplicateName(minor, cred->name, &ctx->acceptorName);
 883         if (GSS_ERROR(major))
 884             return major;
 885     }
 886
 887     major = gssEapReauthComplete(minor, ctx, cred, mech, timeRec);
 888     if (GSS_ERROR(major))
 889         return major;
 890
 891     *minor = 0;
 892     return GSS_S_COMPLETE;
 893 }
 894
 895 static OM_uint32
 896 eapGssSmAcceptGssReauth(OM_uint32 *minor,
 897                         gss_cred_id_t cred,
 898                         gss_ctx_id_t ctx,
 899                         gss_name_t target __attribute__((__unused__)),
 900                         gss_OID mech,
 901                         OM_uint32 reqFlags __attribute__((__unused__)),
 902                         OM_uint32 timeReq __attribute__((__unused__)),
 903                         gss_channel_bindings_t chanBindings,
 904                         gss_buffer_t inputToken,
 905                         gss_buffer_t outputToken,
 906                         OM_uint32 *smFlags)
 907 {
 908     OM_uint32 major, tmpMinor;
 909     gss_name_t krbInitiator = GSS_C_NO_NAME;
 910     OM_uint32 gssFlags, timeRec = GSS_C_INDEFINITE;
 911
 912     /*
 913      * If we're built with fast reauthentication support, it's valid
 914      * for an initiator to send a GSS reauthentication token as its
 915      * initial context token, causing us to short-circuit the state
 916      * machine and process Kerberos GSS messages instead.
 917      */
 918
 919     ctx->flags |= CTX_FLAG_KRB_REAUTH;
 920
 921     major = gssAcceptSecContext(minor,
 922                                 &ctx->kerberosCtx,
 923                                 cred->krbCred,
 924                                 inputToken,
 925                                 chanBindings,
 926                                 &krbInitiator,
 927                                 &mech,
 928                                 outputToken,
 929                                 &gssFlags,
 930                                 &timeRec,
 931                                 NULL);
 932     if (major == GSS_S_COMPLETE) {
 933         major = acceptReadyKrb(minor, ctx, cred,
 934                                krbInitiator, mech, timeRec);
 935         if (major == GSS_S_COMPLETE) {
 936             GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 937         }
 938     }
 939
 940     ctx->gssFlags = gssFlags;
 941
 942     gssReleaseName(&tmpMinor, &krbInitiator);
 943
 944     return major;
 945 }
 946 #endif /* GSSEAP_ENABLE_REAUTH */