www.project-moonshot.org Git - mech_eap.orig/blob - 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 static OM_uint32
 128 eapGssSmAcceptAcceptorName(OM_uint32 *minor,
 129                            gss_cred_id_t cred,
 130                            gss_ctx_id_t ctx,
 131                            gss_name_t target,
 132                            gss_OID mech,
 133                            OM_uint32 reqFlags,
 134                            OM_uint32 timeReq,
 135                            gss_channel_bindings_t chanBindings,
 136                            gss_buffer_t inputToken,
 137                            gss_buffer_t outputToken,
 138                            OM_uint32 *smFlags)
 139 {
 140     OM_uint32 major;
 141
 142     /* XXX TODO import and validate name from inputToken */
 143
 144     if (ctx->acceptorName != GSS_C_NO_NAME) {
 145         /* Send desired target name to acceptor */
 146         major = gssEapDisplayName(minor, ctx->acceptorName,
 147                                   outputToken, NULL);
 148         if (GSS_ERROR(major))
 149             return major;
 150     }
 151
 152     return GSS_S_CONTINUE_NEEDED;
 153 }
 154
 155 #ifdef GSSEAP_DEBUG
 156 static OM_uint32
 157 eapGssSmAcceptVendorInfo(OM_uint32 *minor,
 158                          gss_cred_id_t cred,
 159                          gss_ctx_id_t ctx,
 160                          gss_name_t target,
 161                          gss_OID mech,
 162                          OM_uint32 reqFlags,
 163                          OM_uint32 timeReq,
 164                          gss_channel_bindings_t chanBindings,
 165                          gss_buffer_t inputToken,
 166                          gss_buffer_t outputToken,
 167                          OM_uint32 *smFlags)
 168 {
 169     fprintf(stderr, "GSS-EAP: vendor: %.*s\n",
 170             (int)inputToken->length, (char *)inputToken->value);
 171
 172     return GSS_S_CONTINUE_NEEDED;
 173 }
 174 #endif
 175
 176
 177 /*
 178  * Emit a identity EAP request to force the initiator (peer) to identify
 179  * itself.
 180  */
 181 static OM_uint32
 182 eapGssSmAcceptIdentity(OM_uint32 *minor,
 183                        gss_cred_id_t cred,
 184                        gss_ctx_id_t ctx,
 185                        gss_name_t target __attribute__((__unused__)),
 186                        gss_OID mech __attribute__((__unused__)),
 187                        OM_uint32 reqFlags __attribute__((__unused__)),
 188                        OM_uint32 timeReq __attribute__((__unused__)),
 189                        gss_channel_bindings_t chanBindings __attribute__((__unused__)),
 190                        gss_buffer_t inputToken,
 191                        gss_buffer_t outputToken,
 192                        OM_uint32 *smFlags)
 193 {
 194     OM_uint32 major;
 195     struct wpabuf *reqData;
 196     gss_buffer_desc pktBuffer;
 197
 198     if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
 199         *minor = GSSEAP_CRED_MECH_MISMATCH;
 200         return GSS_S_BAD_MECH;
 201     }
 202
 203     if (inputToken != GSS_C_NO_BUFFER && inputToken->length != 0) {
 204         *minor = GSSEAP_WRONG_SIZE;
 205         return GSS_S_DEFECTIVE_TOKEN;
 206     }
 207
 208     reqData = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY, 0,
 209                             EAP_CODE_REQUEST, 0);
 210     if (reqData == NULL) {
 211         *minor = ENOMEM;
 212         return GSS_S_FAILURE;
 213     }
 214
 215     pktBuffer.length = wpabuf_len(reqData);
 216     pktBuffer.value = (void *)wpabuf_head(reqData);
 217
 218     major = duplicateBuffer(minor, &pktBuffer, outputToken);
 219     if (GSS_ERROR(major))
 220         return major;
 221
 222     wpabuf_free(reqData);
 223
 224     GSSEAP_SM_TRANSITION_NEXT(ctx);
 225
 226     *minor = 0;
 227
 228     return GSS_S_CONTINUE_NEEDED;
 229 }
 230
 231 /*
 232  * Returns TRUE if the input token contains an EAP identity response.
 233  */
 234 static int
 235 isIdentityResponseP(gss_buffer_t inputToken)
 236 {
 237     struct wpabuf respData;
 238
 239     wpabuf_set(&respData, inputToken->value, inputToken->length);
 240
 241     return (eap_get_type(&respData) == EAP_TYPE_IDENTITY);
 242 }
 243
 244 /*
 245  * Save the asserted initiator identity from the EAP identity response.
 246  */
 247 static OM_uint32
 248 importInitiatorIdentity(OM_uint32 *minor,
 249                         gss_ctx_id_t ctx,
 250                         gss_buffer_t inputToken)
 251 {
 252     OM_uint32 tmpMinor;
 253     struct wpabuf respData;
 254     const unsigned char *pos;
 255     size_t len;
 256     gss_buffer_desc nameBuf;
 257
 258     wpabuf_set(&respData, inputToken->value, inputToken->length);
 259
 260     pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY,
 261                            &respData, &len);
 262     if (pos == NULL) {
 263         *minor = GSSEAP_PEER_BAD_MESSAGE;
 264         return GSS_S_DEFECTIVE_TOKEN;
 265     }
 266
 267     nameBuf.value = (void *)pos;
 268     nameBuf.length = len;
 269
 270     gssEapReleaseName(&tmpMinor, &ctx->initiatorName);
 271
 272     return gssEapImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
 273                             &ctx->initiatorName);
 274 }
 275
 276 /*
 277  * Pass the asserted initiator identity to the authentication server.
 278  */
 279 static OM_uint32
 280 setInitiatorIdentity(OM_uint32 *minor,
 281                      gss_ctx_id_t ctx,
 282                      VALUE_PAIR **vps)
 283 {
 284     OM_uint32 major, tmpMinor;
 285     gss_buffer_desc nameBuf;
 286
 287     /*
 288      * We should have got an EAP identity response, but if we didn't, then
 289      * we will just avoid sending User-Name. Note that radsecproxy requires
 290      * User-Name to be sent on every request (presumably so it can remain
 291      * stateless).
 292      */
 293     if (ctx->initiatorName != GSS_C_NO_NAME) {
 294         major = gssEapDisplayName(minor, ctx->initiatorName, &nameBuf, NULL);
 295         if (GSS_ERROR(major))
 296             return major;
 297
 298         major = gssEapRadiusAddAvp(minor, vps, PW_USER_NAME, 0, &nameBuf);
 299         if (GSS_ERROR(major))
 300             return major;
 301
 302         gss_release_buffer(&tmpMinor, &nameBuf);
 303     }
 304
 305     *minor = 0;
 306     return GSS_S_COMPLETE;
 307 }
 308
 309 /*
 310  * Pass the asserted acceptor identity to the authentication server.
 311  */
 312 static OM_uint32
 313 setAcceptorIdentity(OM_uint32 *minor,
 314                     gss_ctx_id_t ctx,
 315                     VALUE_PAIR **vps)
 316 {
 317     OM_uint32 major;
 318     gss_buffer_desc nameBuf;
 319     krb5_context krbContext = NULL;
 320     krb5_principal krbPrinc;
 321     struct rs_context *rc = ctx->acceptorCtx.radContext;
 322
 323     assert(rc != NULL);
 324
 325     if (ctx->acceptorName == GSS_C_NO_NAME) {
 326         *minor = 0;
 327         return GSS_S_COMPLETE;
 328     }
 329
 330     if ((ctx->acceptorName->flags & NAME_FLAG_SERVICE) == 0) {
 331         *minor = GSSEAP_BAD_SERVICE_NAME;
 332         return GSS_S_BAD_NAME;
 333     }
 334
 335     GSSEAP_KRB_INIT(&krbContext);
 336
 337     krbPrinc = ctx->acceptorName->krbPrincipal;
 338     assert(krbPrinc != NULL);
 339     assert(KRB_PRINC_LENGTH(krbPrinc) >= 2);
 340
 341     /* Acceptor-Service-Name */
 342     krbPrincComponentToGssBuffer(krbPrinc, 0, &nameBuf);
 343
 344     major = gssEapRadiusAddAvp(minor, vps,
 345                                PW_GSS_ACCEPTOR_SERVICE_NAME,
 346                                VENDORPEC_UKERNA,
 347                                &nameBuf);
 348     if (GSS_ERROR(major))
 349         return major;
 350
 351     /* Acceptor-Host-Name */
 352     krbPrincComponentToGssBuffer(krbPrinc, 1, &nameBuf);
 353
 354     major = gssEapRadiusAddAvp(minor, vps,
 355                                PW_GSS_ACCEPTOR_HOST_NAME,
 356                                VENDORPEC_UKERNA,
 357                                &nameBuf);
 358     if (GSS_ERROR(major))
 359         return major;
 360
 361     if (KRB_PRINC_LENGTH(krbPrinc) > 2) {
 362         /* Acceptor-Service-Specific */
 363         krb5_principal_data ssiPrinc = *krbPrinc;
 364         char *ssi;
 365
 366         KRB_PRINC_LENGTH(&ssiPrinc) -= 2;
 367         KRB_PRINC_NAME(&ssiPrinc) += 2;
 368
 369         *minor = krb5_unparse_name_flags(krbContext, &ssiPrinc,
 370                                          KRB5_PRINCIPAL_UNPARSE_NO_REALM, &ssi);
 371         if (*minor != 0)
 372             return GSS_S_FAILURE;
 373
 374         nameBuf.value = ssi;
 375         nameBuf.length = strlen(ssi);
 376
 377         major = gssEapRadiusAddAvp(minor, vps,
 378                                    PW_GSS_ACCEPTOR_SERVICE_SPECIFIC,
 379                                    VENDORPEC_UKERNA,
 380                                    &nameBuf);
 381
 382         if (GSS_ERROR(major)) {
 383             krb5_free_unparsed_name(krbContext, ssi);
 384             return major;
 385         }
 386         krb5_free_unparsed_name(krbContext, ssi);
 387     }
 388
 389     krbPrincRealmToGssBuffer(krbPrinc, &nameBuf);
 390     if (nameBuf.length != 0) {
 391         /* Acceptor-Realm-Name */
 392         major = gssEapRadiusAddAvp(minor, vps,
 393                                    PW_GSS_ACCEPTOR_REALM_NAME,
 394                                    VENDORPEC_UKERNA,
 395                                    &nameBuf);
 396         if (GSS_ERROR(major))
 397             return major;
 398     }
 399
 400     *minor = 0;
 401     return GSS_S_COMPLETE;
 402 }
 403
 404 /*
 405  * Allocate a RadSec handle
 406  */
 407 static OM_uint32
 408 createRadiusHandle(OM_uint32 *minor,
 409                    gss_cred_id_t cred,
 410                    gss_ctx_id_t ctx)
 411 {
 412     struct gss_eap_acceptor_ctx *actx = &ctx->acceptorCtx;
 413     const char *configFile = RS_CONFIG_FILE;
 414     const char *configStanza = "gss-eap";
 415     struct rs_alloc_scheme ralloc;
 416     struct rs_error *err;
 417
 418     assert(actx->radContext == NULL);
 419     assert(actx->radConn == NULL);
 420
 421     if (rs_context_create(&actx->radContext, RS_DICT_FILE) != 0) {
 422         *minor = GSSEAP_RADSEC_CONTEXT_FAILURE;
 423         return GSS_S_FAILURE;
 424     }
 425
 426     if (cred->radiusConfigFile != NULL)
 427         configFile = cred->radiusConfigFile;
 428     if (cred->radiusConfigStanza != NULL)
 429         configStanza = cred->radiusConfigStanza;
 430
 431     ralloc.calloc  = GSSEAP_CALLOC;
 432     ralloc.malloc  = GSSEAP_MALLOC;
 433     ralloc.free    = GSSEAP_FREE;
 434     ralloc.realloc = GSSEAP_REALLOC;
 435
 436     rs_context_set_alloc_scheme(actx->radContext, &ralloc);
 437
 438     if (rs_context_read_config(actx->radContext, configFile) != 0) {
 439         err = rs_err_ctx_pop(actx->radContext);
 440         goto fail;
 441     }
 442
 443     if (rs_conn_create(actx->radContext, &actx->radConn, configStanza) != 0) {
 444         err = rs_err_conn_pop(actx->radConn);
 445         goto fail;
 446     }
 447
 448     if (actx->radServer != NULL) {
 449         if (rs_conn_select_peer(actx->radConn, actx->radServer) != 0) {
 450             err = rs_err_conn_pop(actx->radConn);
 451             goto fail;
 452         }
 453     }
 454
 455     *minor = 0;
 456     return GSS_S_COMPLETE;
 457
 458 fail:
 459     return gssEapRadiusMapError(minor, err);
 460 }
 461
 462 /*
 463  * Process a EAP response from the initiator.
 464  */
 465 static OM_uint32
 466 eapGssSmAcceptAuthenticate(OM_uint32 *minor,
 467                            gss_cred_id_t cred,
 468                            gss_ctx_id_t ctx,
 469                            gss_name_t target __attribute__((__unused__)),
 470                            gss_OID mech __attribute__((__unused__)),
 471                            OM_uint32 reqFlags __attribute__((__unused__)),
 472                            OM_uint32 timeReq __attribute__((__unused__)),
 473                            gss_channel_bindings_t chanBindings,
 474                            gss_buffer_t inputToken,
 475                            gss_buffer_t outputToken,
 476                            OM_uint32 *smFlags)
 477 {
 478     OM_uint32 major, tmpMinor;
 479     struct rs_connection *rconn;
 480     struct rs_request *request = NULL;
 481     struct rs_packet *req = NULL, *resp = NULL;
 482     struct radius_packet *frreq, *frresp;
 483
 484     if (ctx->acceptorCtx.radContext == NULL) {
 485         /* May be NULL from an imported partial context */
 486         major = createRadiusHandle(minor, cred, ctx);
 487         if (GSS_ERROR(major))
 488             goto cleanup;
 489     }
 490
 491     if (isIdentityResponseP(inputToken)) {
 492         major = importInitiatorIdentity(minor, ctx, inputToken);
 493         if (GSS_ERROR(major))
 494             return major;
 495     }
 496
 497     rconn = ctx->acceptorCtx.radConn;
 498
 499     if (rs_packet_create_authn_request(rconn, &req, NULL, NULL) != 0) {
 500         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 501         goto cleanup;
 502     }
 503     frreq = rs_packet_frpkt(req);
 504
 505     major = setInitiatorIdentity(minor, ctx, &frreq->vps);
 506     if (GSS_ERROR(major))
 507         goto cleanup;
 508
 509     major = setAcceptorIdentity(minor, ctx, &frreq->vps);
 510     if (GSS_ERROR(major))
 511         goto cleanup;
 512
 513     major = gssEapRadiusAddAvp(minor, &frreq->vps,
 514                                PW_EAP_MESSAGE, 0, inputToken);
 515     if (GSS_ERROR(major))
 516         goto cleanup;
 517
 518     if (ctx->acceptorCtx.state.length != 0) {
 519         major = gssEapRadiusAddAvp(minor, &frreq->vps, PW_STATE, 0,
 520                                    &ctx->acceptorCtx.state);
 521         if (GSS_ERROR(major))
 522             goto cleanup;
 523
 524         gss_release_buffer(&tmpMinor, &ctx->acceptorCtx.state);
 525     }
 526
 527     if (rs_request_create(rconn, &request) != 0) {
 528         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 529         goto cleanup;
 530     }
 531
 532     rs_request_add_reqpkt(request, req);
 533     req = NULL;
 534
 535     if (rs_request_send(request, &resp) != 0) {
 536         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 537         goto cleanup;
 538     }
 539
 540     assert(resp != NULL);
 541
 542     frresp = rs_packet_frpkt(resp);
 543     switch (frresp->code) {
 544     case PW_AUTHENTICATION_ACK:
 545     case PW_ACCESS_CHALLENGE:
 546         break;
 547     case PW_AUTHENTICATION_REJECT:
 548         *minor = GSSEAP_RADIUS_AUTH_FAILURE;
 549         major = GSS_S_DEFECTIVE_CREDENTIAL;
 550         goto cleanup;
 551         break;
 552     default:
 553         *minor = GSSEAP_UNKNOWN_RADIUS_CODE;
 554         major = GSS_S_FAILURE;
 555         goto cleanup;
 556         break;
 557     }
 558
 559     major = gssEapRadiusGetAvp(minor, frresp->vps, PW_EAP_MESSAGE, 0,
 560                                outputToken, TRUE);
 561     if (major == GSS_S_UNAVAILABLE && frresp->code == PW_ACCESS_CHALLENGE) {
 562         *minor = GSSEAP_MISSING_EAP_REQUEST;
 563         major = GSS_S_DEFECTIVE_TOKEN;
 564         goto cleanup;
 565     } else if (GSS_ERROR(major))
 566         goto cleanup;
 567
 568     if (frresp->code == PW_ACCESS_CHALLENGE) {
 569         major = gssEapRadiusGetAvp(minor, frresp->vps, PW_STATE, 0,
 570                                    &ctx->acceptorCtx.state, TRUE);
 571         if (GSS_ERROR(major) && *minor != GSSEAP_NO_SUCH_ATTR)
 572             goto cleanup;
 573     } else {
 574         ctx->acceptorCtx.vps = frresp->vps;
 575         frresp->vps = NULL;
 576
 577         rs_conn_destroy(ctx->acceptorCtx.radConn);
 578         ctx->acceptorCtx.radConn = NULL;
 579
 580         major = acceptReadyEap(minor, ctx, cred);
 581         if (GSS_ERROR(major))
 582             goto cleanup;
 583
 584         GSSEAP_SM_TRANSITION_NEXT(ctx);
 585     }
 586
 587     major = GSS_S_CONTINUE_NEEDED;
 588     *minor = 0;
 589
 590 cleanup:
 591     if (request != NULL)
 592         rs_request_destroy(request);
 593     if (req != NULL)
 594         rs_packet_destroy(req);
 595
 596     return major;
 597 }
 598
 599 static OM_uint32
 600 eapGssSmAcceptGssChannelBindings(OM_uint32 *minor,
 601                                  gss_cred_id_t cred,
 602                                  gss_ctx_id_t ctx,
 603                                  gss_name_t target __attribute__((__unused__)),
 604                                  gss_OID mech __attribute__((__unused__)),
 605                                  OM_uint32 reqFlags __attribute__((__unused__)),
 606                                  OM_uint32 timeReq __attribute__((__unused__)),
 607                                  gss_channel_bindings_t chanBindings,
 608                                  gss_buffer_t inputToken,
 609                                  gss_buffer_t outputToken,
 610                                  OM_uint32 *smFlags)
 611 {
 612     OM_uint32 major, tmpMinor;
 613     gss_iov_buffer_desc iov[2];
 614
 615     iov[0].type = GSS_IOV_BUFFER_TYPE_DATA | GSS_IOV_BUFFER_FLAG_ALLOCATE;
 616     iov[0].buffer.length = 0;
 617     iov[0].buffer.value = NULL;
 618
 619     iov[1].type = GSS_IOV_BUFFER_TYPE_STREAM;
 620     iov[1].buffer = *inputToken;
 621
 622     major = gssEapUnwrapOrVerifyMIC(minor, ctx, NULL, NULL,
 623                                     iov, 2, TOK_TYPE_WRAP);
 624     if (GSS_ERROR(major))
 625         return GSS_S_BAD_BINDINGS;
 626
 627     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS &&
 628         !bufferEqual(&iov[0].buffer, &chanBindings->application_data)) {
 629         major = GSS_S_BAD_BINDINGS;
 630         *minor = GSSEAP_BINDINGS_MISMATCH;
 631     } else {
 632         major = GSS_S_CONTINUE_NEEDED;
 633         *minor = 0;
 634     }
 635
 636     gss_release_buffer(&tmpMinor, &iov[0].buffer);
 637
 638     return major;
 639 }
 640
 641 #ifdef GSSEAP_ENABLE_REAUTH
 642 static OM_uint32
 643 eapGssSmAcceptReauthCreds(OM_uint32 *minor,
 644                           gss_cred_id_t cred,
 645                           gss_ctx_id_t ctx,
 646                           gss_name_t target __attribute__((__unused__)),
 647                           gss_OID mech __attribute__((__unused__)),
 648                           OM_uint32 reqFlags __attribute__((__unused__)),
 649                           OM_uint32 timeReq __attribute__((__unused__)),
 650                           gss_channel_bindings_t chanBindings __attribute__((__unused__)),
 651                           gss_buffer_t inputToken,
 652                           gss_buffer_t outputToken,
 653                           OM_uint32 *smFlags)
 654 {
 655     OM_uint32 major;
 656
 657     /*
 658      * If we're built with fast reauthentication enabled, then
 659      * fabricate a ticket from the initiator to ourselves.
 660      */
 661     major = gssEapMakeReauthCreds(minor, ctx, cred, outputToken);
 662     if (major == GSS_S_UNAVAILABLE)
 663         major = GSS_S_COMPLETE;
 664     if (major == GSS_S_COMPLETE)
 665         major = GSS_S_CONTINUE_NEEDED;
 666
 667     return major;
 668 }
 669 #endif
 670
 671 static OM_uint32
 672 eapGssSmAcceptCompleteInitiatorExts(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_NEXT(ctx);
 685
 686     *minor = 0;
 687
 688     return GSS_S_CONTINUE_NEEDED;
 689 }
 690
 691 static OM_uint32
 692 eapGssSmAcceptCompleteAcceptorExts(OM_uint32 *minor,
 693                                    gss_cred_id_t cred,
 694                                    gss_ctx_id_t ctx,
 695                                    gss_name_t target,
 696                                    gss_OID mech,
 697                                    OM_uint32 reqFlags,
 698                                    OM_uint32 timeReq,
 699                                    gss_channel_bindings_t chanBindings,
 700                                    gss_buffer_t inputToken,
 701                                    gss_buffer_t outputToken,
 702                                    OM_uint32 *smFlags)
 703 {
 704     GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 705
 706     *minor = 0;
 707     *smFlags |= SM_FLAG_FORCE_SEND_TOKEN;
 708
 709     return GSS_S_COMPLETE;
 710 }
 711
 712 static struct gss_eap_sm eapGssAcceptorSm[] = {
 713     {
 714         ITOK_TYPE_ACCEPTOR_NAME_REQ,
 715         ITOK_TYPE_ACCEPTOR_NAME_RESP,
 716         GSSEAP_STATE_INITIAL,
 717         0,
 718         eapGssSmAcceptAcceptorName
 719     },
 720 #ifdef GSSEAP_DEBUG
 721     {
 722         ITOK_TYPE_VENDOR_INFO,
 723         ITOK_TYPE_NONE,
 724         GSSEAP_STATE_INITIAL,
 725         0,
 726         eapGssSmAcceptVendorInfo,
 727     },
 728 #endif
 729 #ifdef GSSEAP_ENABLE_REAUTH
 730     {
 731         ITOK_TYPE_REAUTH_REQ,
 732         ITOK_TYPE_REAUTH_RESP,
 733         GSSEAP_STATE_INITIAL,
 734         0,
 735         eapGssSmAcceptGssReauth,
 736     },
 737 #endif
 738     {
 739         ITOK_TYPE_NONE,
 740         ITOK_TYPE_EAP_REQ,
 741         GSSEAP_STATE_INITIAL,
 742         SM_ITOK_FLAG_CRITICAL | SM_ITOK_FLAG_REQUIRED,
 743         eapGssSmAcceptIdentity,
 744     },
 745     {
 746         ITOK_TYPE_EAP_RESP,
 747         ITOK_TYPE_EAP_REQ,
 748         GSSEAP_STATE_AUTHENTICATE,
 749         SM_ITOK_FLAG_CRITICAL | SM_ITOK_FLAG_REQUIRED,
 750         eapGssSmAcceptAuthenticate
 751     },
 752     {
 753         ITOK_TYPE_GSS_CHANNEL_BINDINGS,
 754         ITOK_TYPE_NONE,
 755         GSSEAP_STATE_INITIATOR_EXTS,
 756         SM_ITOK_FLAG_CRITICAL | SM_ITOK_FLAG_REQUIRED,
 757         eapGssSmAcceptGssChannelBindings,
 758     },
 759     {
 760         ITOK_TYPE_NONE,
 761         ITOK_TYPE_NONE,
 762         GSSEAP_STATE_INITIATOR_EXTS,
 763         0,
 764         eapGssSmAcceptCompleteInitiatorExts,
 765     },
 766 #ifdef GSSEAP_ENABLE_REAUTH
 767     {
 768         ITOK_TYPE_NONE,
 769         ITOK_TYPE_REAUTH_CREDS,
 770         GSSEAP_STATE_ACCEPTOR_EXTS,
 771         0,
 772         eapGssSmAcceptReauthCreds,
 773     },
 774 #endif
 775     {
 776         ITOK_TYPE_NONE,
 777         ITOK_TYPE_NONE,
 778         GSSEAP_STATE_ACCEPTOR_EXTS,
 779         0,
 780         eapGssSmAcceptCompleteAcceptorExts
 781     },
 782 };
 783
 784 OM_uint32
 785 gss_accept_sec_context(OM_uint32 *minor,
 786                        gss_ctx_id_t *context_handle,
 787                        gss_cred_id_t cred,
 788                        gss_buffer_t input_token,
 789                        gss_channel_bindings_t input_chan_bindings,
 790                        gss_name_t *src_name,
 791                        gss_OID *mech_type,
 792                        gss_buffer_t output_token,
 793                        OM_uint32 *ret_flags,
 794                        OM_uint32 *time_rec,
 795                        gss_cred_id_t *delegated_cred_handle)
 796 {
 797     OM_uint32 major, tmpMinor;
 798     gss_ctx_id_t ctx = *context_handle;
 799
 800     *minor = 0;
 801
 802     output_token->length = 0;
 803     output_token->value = NULL;
 804
 805     if (src_name != NULL)
 806         *src_name = GSS_C_NO_NAME;
 807
 808     if (input_token == GSS_C_NO_BUFFER || input_token->length == 0) {
 809         *minor = GSSEAP_TOK_TRUNC;
 810         return GSS_S_DEFECTIVE_TOKEN;
 811     }
 812
 813     if (ctx == GSS_C_NO_CONTEXT) {
 814         major = gssEapAllocContext(minor, &ctx);
 815         if (GSS_ERROR(major))
 816             return major;
 817
 818         *context_handle = ctx;
 819     }
 820
 821     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 822
 823     if (cred == GSS_C_NO_CREDENTIAL) {
 824         if (ctx->defaultCred == GSS_C_NO_CREDENTIAL) {
 825             major = gssEapAcquireCred(minor,
 826                                       GSS_C_NO_NAME,
 827                                       GSS_C_NO_BUFFER,
 828                                       GSS_C_INDEFINITE,
 829                                       GSS_C_NO_OID_SET,
 830                                       GSS_C_ACCEPT,
 831                                       &ctx->defaultCred,
 832                                       NULL,
 833                                       NULL);
 834             if (GSS_ERROR(major))
 835                 goto cleanup;
 836         }
 837
 838         cred = ctx->defaultCred;
 839     }
 840
 841     GSSEAP_MUTEX_LOCK(&cred->mutex);
 842
 843     if (cred->name != GSS_C_NO_NAME) {
 844         major = gssEapDuplicateName(minor, cred->name, &ctx->acceptorName);
 845         if (GSS_ERROR(major))
 846             goto cleanup;
 847     }
 848
 849     major = gssEapSmStep(minor,
 850                          cred,
 851                          ctx,
 852                          GSS_C_NO_NAME,
 853                          GSS_C_NO_OID,
 854                          0,
 855                          GSS_C_INDEFINITE,
 856                          input_chan_bindings,
 857                          input_token,
 858                          output_token,
 859                          eapGssAcceptorSm,
 860                          sizeof(eapGssAcceptorSm) / sizeof(eapGssAcceptorSm[0]));
 861     if (GSS_ERROR(major))
 862         goto cleanup;
 863
 864     if (mech_type != NULL) {
 865         if (!gssEapInternalizeOid(ctx->mechanismUsed, mech_type))
 866             duplicateOid(&tmpMinor, ctx->mechanismUsed, mech_type);
 867     }
 868     if (ret_flags != NULL)
 869         *ret_flags = ctx->gssFlags;
 870     if (delegated_cred_handle != NULL)
 871         *delegated_cred_handle = GSS_C_NO_CREDENTIAL;
 872
 873     if (major == GSS_S_COMPLETE) {
 874         if (src_name != NULL && ctx->initiatorName != GSS_C_NO_NAME) {
 875             major = gssEapDuplicateName(&tmpMinor, ctx->initiatorName, src_name);
 876             if (GSS_ERROR(major))
 877                 goto cleanup;
 878         }
 879         if (time_rec != NULL) {
 880             major = gssEapContextTime(&tmpMinor, ctx, time_rec);
 881             if (GSS_ERROR(major))
 882                 goto cleanup;
 883         }
 884     }
 885
 886     assert(CTX_IS_ESTABLISHED(ctx) || major == GSS_S_CONTINUE_NEEDED);
 887
 888 cleanup:
 889     if (cred != GSS_C_NO_CREDENTIAL)
 890         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
 891     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 892
 893     if (GSS_ERROR(major))
 894         gssEapReleaseContext(&tmpMinor, context_handle);
 895
 896     return major;
 897 }
 898
 899 #ifdef GSSEAP_ENABLE_REAUTH
 900 static OM_uint32
 901 acceptReadyKrb(OM_uint32 *minor,
 902                gss_ctx_id_t ctx,
 903                gss_cred_id_t cred,
 904                const gss_name_t initiator,
 905                const gss_OID mech,
 906                OM_uint32 timeRec)
 907 {
 908     OM_uint32 major;
 909
 910     major = gssEapGlueToMechName(minor, ctx, initiator, &ctx->initiatorName);
 911     if (GSS_ERROR(major))
 912         return major;
 913
 914     major = gssEapReauthComplete(minor, ctx, cred, mech, timeRec);
 915     if (GSS_ERROR(major))
 916         return major;
 917
 918     *minor = 0;
 919     return GSS_S_COMPLETE;
 920 }
 921
 922 static OM_uint32
 923 eapGssSmAcceptGssReauth(OM_uint32 *minor,
 924                         gss_cred_id_t cred,
 925                         gss_ctx_id_t ctx,
 926                         gss_name_t target __attribute__((__unused__)),
 927                         gss_OID mech,
 928                         OM_uint32 reqFlags __attribute__((__unused__)),
 929                         OM_uint32 timeReq __attribute__((__unused__)),
 930                         gss_channel_bindings_t chanBindings,
 931                         gss_buffer_t inputToken,
 932                         gss_buffer_t outputToken,
 933                         OM_uint32 *smFlags)
 934 {
 935     OM_uint32 major, tmpMinor;
 936     gss_name_t krbInitiator = GSS_C_NO_NAME;
 937     OM_uint32 gssFlags, timeRec = GSS_C_INDEFINITE;
 938
 939     /*
 940      * If we're built with fast reauthentication support, it's valid
 941      * for an initiator to send a GSS reauthentication token as its
 942      * initial context token, causing us to short-circuit the state
 943      * machine and process Kerberos GSS messages instead.
 944      */
 945
 946     ctx->flags |= CTX_FLAG_KRB_REAUTH;
 947
 948     major = gssAcceptSecContext(minor,
 949                                 &ctx->kerberosCtx,
 950                                 cred->krbCred,
 951                                 inputToken,
 952                                 chanBindings,
 953                                 &krbInitiator,
 954                                 &mech,
 955                                 outputToken,
 956                                 &gssFlags,
 957                                 &timeRec,
 958                                 NULL);
 959     if (major == GSS_S_COMPLETE) {
 960         major = acceptReadyKrb(minor, ctx, cred,
 961                                krbInitiator, mech, timeRec);
 962         if (major == GSS_S_COMPLETE) {
 963             GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 964         }
 965     }
 966
 967     ctx->gssFlags = gssFlags;
 968
 969     gssReleaseName(&tmpMinor, &krbInitiator);
 970
 971     return major;
 972 }
 973 #endif /* GSSEAP_ENABLE_REAUTH */