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,
  46                         gss_OID mech,
  47                         OM_uint32 reqFlags,
  48                         OM_uint32 timeReq,
  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 GSSEAP_UNUSED,
 130                            gss_ctx_id_t ctx,
 131                            gss_name_t target GSSEAP_UNUSED,
 132                            gss_OID mech GSSEAP_UNUSED,
 133                            OM_uint32 reqFlags GSSEAP_UNUSED,
 134                            OM_uint32 timeReq GSSEAP_UNUSED,
 135                            gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 136                            gss_buffer_t inputToken GSSEAP_UNUSED,
 137                            gss_buffer_t outputToken,
 138                            OM_uint32 *smFlags GSSEAP_UNUSED)
 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 GSSEAP_UNUSED,
 159                          gss_ctx_id_t ctx GSSEAP_UNUSED,
 160                          gss_name_t target GSSEAP_UNUSED,
 161                          gss_OID mech GSSEAP_UNUSED,
 162                          OM_uint32 reqFlags GSSEAP_UNUSED,
 163                          OM_uint32 timeReq GSSEAP_UNUSED,
 164                          gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 165                          gss_buffer_t inputToken,
 166                          gss_buffer_t outputToken GSSEAP_UNUSED,
 167                          OM_uint32 *smFlags GSSEAP_UNUSED)
 168 {
 169     fprintf(stderr, "GSS-EAP: vendor: %.*s\n",
 170             (int)inputToken->length, (char *)inputToken->value);
 171
 172     *minor = 0;
 173     return GSS_S_CONTINUE_NEEDED;
 174 }
 175 #endif
 176
 177
 178 /*
 179  * Emit a identity EAP request to force the initiator (peer) to identify
 180  * itself.
 181  */
 182 static OM_uint32
 183 eapGssSmAcceptIdentity(OM_uint32 *minor,
 184                        gss_cred_id_t cred,
 185                        gss_ctx_id_t ctx,
 186                        gss_name_t target GSSEAP_UNUSED,
 187                        gss_OID mech GSSEAP_UNUSED,
 188                        OM_uint32 reqFlags GSSEAP_UNUSED,
 189                        OM_uint32 timeReq GSSEAP_UNUSED,
 190                        gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 191                        gss_buffer_t inputToken,
 192                        gss_buffer_t outputToken,
 193                        OM_uint32 *smFlags)
 194 {
 195     OM_uint32 major;
 196     struct wpabuf *reqData;
 197     gss_buffer_desc pktBuffer;
 198
 199     if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
 200         *minor = GSSEAP_CRED_MECH_MISMATCH;
 201         return GSS_S_BAD_MECH;
 202     }
 203
 204     if (inputToken != GSS_C_NO_BUFFER && inputToken->length != 0) {
 205         *minor = GSSEAP_WRONG_SIZE;
 206         return GSS_S_DEFECTIVE_TOKEN;
 207     }
 208
 209     reqData = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY, 0,
 210                             EAP_CODE_REQUEST, 0);
 211     if (reqData == NULL) {
 212         *minor = ENOMEM;
 213         return GSS_S_FAILURE;
 214     }
 215
 216     pktBuffer.length = wpabuf_len(reqData);
 217     pktBuffer.value = (void *)wpabuf_head(reqData);
 218
 219     major = duplicateBuffer(minor, &pktBuffer, outputToken);
 220     if (GSS_ERROR(major))
 221         return major;
 222
 223     wpabuf_free(reqData);
 224
 225     GSSEAP_SM_TRANSITION_NEXT(ctx);
 226
 227     *minor = 0;
 228     *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 229
 230     return GSS_S_CONTINUE_NEEDED;
 231 }
 232
 233 /*
 234  * Returns TRUE if the input token contains an EAP identity response.
 235  */
 236 static int
 237 isIdentityResponseP(gss_buffer_t inputToken)
 238 {
 239     struct wpabuf respData;
 240
 241     wpabuf_set(&respData, inputToken->value, inputToken->length);
 242
 243     return (eap_get_type(&respData) == EAP_TYPE_IDENTITY);
 244 }
 245
 246 /*
 247  * Save the asserted initiator identity from the EAP identity response.
 248  */
 249 static OM_uint32
 250 importInitiatorIdentity(OM_uint32 *minor,
 251                         gss_ctx_id_t ctx,
 252                         gss_buffer_t inputToken)
 253 {
 254     OM_uint32 tmpMinor;
 255     struct wpabuf respData;
 256     const unsigned char *pos;
 257     size_t len;
 258     gss_buffer_desc nameBuf;
 259
 260     wpabuf_set(&respData, inputToken->value, inputToken->length);
 261
 262     pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY,
 263                            &respData, &len);
 264     if (pos == NULL) {
 265         *minor = GSSEAP_PEER_BAD_MESSAGE;
 266         return GSS_S_DEFECTIVE_TOKEN;
 267     }
 268
 269     nameBuf.value = (void *)pos;
 270     nameBuf.length = len;
 271
 272     gssEapReleaseName(&tmpMinor, &ctx->initiatorName);
 273
 274     return gssEapImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
 275                             &ctx->initiatorName);
 276 }
 277
 278 /*
 279  * Pass the asserted initiator identity to the authentication server.
 280  */
 281 static OM_uint32
 282 setInitiatorIdentity(OM_uint32 *minor,
 283                      gss_ctx_id_t ctx,
 284                      VALUE_PAIR **vps)
 285 {
 286     OM_uint32 major, tmpMinor;
 287     gss_buffer_desc nameBuf;
 288
 289     /*
 290      * We should have got an EAP identity response, but if we didn't, then
 291      * we will just avoid sending User-Name. Note that radsecproxy requires
 292      * User-Name to be sent on every request (presumably so it can remain
 293      * stateless).
 294      */
 295     if (ctx->initiatorName != GSS_C_NO_NAME) {
 296         major = gssEapDisplayName(minor, ctx->initiatorName, &nameBuf, NULL);
 297         if (GSS_ERROR(major))
 298             return major;
 299
 300         major = gssEapRadiusAddAvp(minor, vps, PW_USER_NAME, 0, &nameBuf);
 301         if (GSS_ERROR(major))
 302             return major;
 303
 304         gss_release_buffer(&tmpMinor, &nameBuf);
 305     }
 306
 307     *minor = 0;
 308     return GSS_S_COMPLETE;
 309 }
 310
 311 /*
 312  * Pass the asserted acceptor identity to the authentication server.
 313  */
 314 static OM_uint32
 315 setAcceptorIdentity(OM_uint32 *minor,
 316                     gss_ctx_id_t ctx,
 317                     VALUE_PAIR **vps)
 318 {
 319     OM_uint32 major;
 320     gss_buffer_desc nameBuf;
 321     krb5_context krbContext = NULL;
 322     krb5_principal krbPrinc;
 323     struct rs_context *rc = ctx->acceptorCtx.radContext;
 324
 325     assert(rc != NULL);
 326
 327     if (ctx->acceptorName == GSS_C_NO_NAME) {
 328         *minor = 0;
 329         return GSS_S_COMPLETE;
 330     }
 331
 332     if ((ctx->acceptorName->flags & NAME_FLAG_SERVICE) == 0) {
 333         *minor = GSSEAP_BAD_SERVICE_NAME;
 334         return GSS_S_BAD_NAME;
 335     }
 336
 337     GSSEAP_KRB_INIT(&krbContext);
 338
 339     krbPrinc = ctx->acceptorName->krbPrincipal;
 340     assert(krbPrinc != NULL);
 341     assert(KRB_PRINC_LENGTH(krbPrinc) >= 2);
 342
 343     /* Acceptor-Service-Name */
 344     krbPrincComponentToGssBuffer(krbPrinc, 0, &nameBuf);
 345
 346     major = gssEapRadiusAddAvp(minor, vps,
 347                                PW_GSS_ACCEPTOR_SERVICE_NAME,
 348                                VENDORPEC_UKERNA,
 349                                &nameBuf);
 350     if (GSS_ERROR(major))
 351         return major;
 352
 353     /* Acceptor-Host-Name */
 354     krbPrincComponentToGssBuffer(krbPrinc, 1, &nameBuf);
 355
 356     major = gssEapRadiusAddAvp(minor, vps,
 357                                PW_GSS_ACCEPTOR_HOST_NAME,
 358                                VENDORPEC_UKERNA,
 359                                &nameBuf);
 360     if (GSS_ERROR(major))
 361         return major;
 362
 363     if (KRB_PRINC_LENGTH(krbPrinc) > 2) {
 364         /* Acceptor-Service-Specific */
 365         krb5_principal_data ssiPrinc = *krbPrinc;
 366         char *ssi;
 367
 368         KRB_PRINC_LENGTH(&ssiPrinc) -= 2;
 369         KRB_PRINC_NAME(&ssiPrinc) += 2;
 370
 371         *minor = krb5_unparse_name_flags(krbContext, &ssiPrinc,
 372                                          KRB5_PRINCIPAL_UNPARSE_NO_REALM, &ssi);
 373         if (*minor != 0)
 374             return GSS_S_FAILURE;
 375
 376         nameBuf.value = ssi;
 377         nameBuf.length = strlen(ssi);
 378
 379         major = gssEapRadiusAddAvp(minor, vps,
 380                                    PW_GSS_ACCEPTOR_SERVICE_SPECIFIC,
 381                                    VENDORPEC_UKERNA,
 382                                    &nameBuf);
 383
 384         if (GSS_ERROR(major)) {
 385             krb5_free_unparsed_name(krbContext, ssi);
 386             return major;
 387         }
 388         krb5_free_unparsed_name(krbContext, ssi);
 389     }
 390
 391     krbPrincRealmToGssBuffer(krbPrinc, &nameBuf);
 392     if (nameBuf.length != 0) {
 393         /* Acceptor-Realm-Name */
 394         major = gssEapRadiusAddAvp(minor, vps,
 395                                    PW_GSS_ACCEPTOR_REALM_NAME,
 396                                    VENDORPEC_UKERNA,
 397                                    &nameBuf);
 398         if (GSS_ERROR(major))
 399             return major;
 400     }
 401
 402     *minor = 0;
 403     return GSS_S_COMPLETE;
 404 }
 405
 406 /*
 407  * Allocate a RadSec handle
 408  */
 409 static OM_uint32
 410 createRadiusHandle(OM_uint32 *minor,
 411                    gss_cred_id_t cred,
 412                    gss_ctx_id_t ctx)
 413 {
 414     struct gss_eap_acceptor_ctx *actx = &ctx->acceptorCtx;
 415     const char *configFile = RS_CONFIG_FILE;
 416     const char *configStanza = "gss-eap";
 417     struct rs_alloc_scheme ralloc;
 418     struct rs_error *err;
 419
 420     assert(actx->radContext == NULL);
 421     assert(actx->radConn == NULL);
 422
 423     if (rs_context_create(&actx->radContext, RS_DICT_FILE) != 0) {
 424         *minor = GSSEAP_RADSEC_CONTEXT_FAILURE;
 425         return GSS_S_FAILURE;
 426     }
 427
 428     if (cred->radiusConfigFile != NULL)
 429         configFile = cred->radiusConfigFile;
 430     if (cred->radiusConfigStanza != NULL)
 431         configStanza = cred->radiusConfigStanza;
 432
 433     ralloc.calloc  = GSSEAP_CALLOC;
 434     ralloc.malloc  = GSSEAP_MALLOC;
 435     ralloc.free    = GSSEAP_FREE;
 436     ralloc.realloc = GSSEAP_REALLOC;
 437
 438     rs_context_set_alloc_scheme(actx->radContext, &ralloc);
 439
 440     if (rs_context_read_config(actx->radContext, configFile) != 0) {
 441         err = rs_err_ctx_pop(actx->radContext);
 442         goto fail;
 443     }
 444
 445     if (rs_conn_create(actx->radContext, &actx->radConn, configStanza) != 0) {
 446         err = rs_err_conn_pop(actx->radConn);
 447         goto fail;
 448     }
 449
 450     if (actx->radServer != NULL) {
 451         if (rs_conn_select_peer(actx->radConn, actx->radServer) != 0) {
 452             err = rs_err_conn_pop(actx->radConn);
 453             goto fail;
 454         }
 455     }
 456
 457     *minor = 0;
 458     return GSS_S_COMPLETE;
 459
 460 fail:
 461     return gssEapRadiusMapError(minor, err);
 462 }
 463
 464 /*
 465  * Process a EAP response from the initiator.
 466  */
 467 static OM_uint32
 468 eapGssSmAcceptAuthenticate(OM_uint32 *minor,
 469                            gss_cred_id_t cred,
 470                            gss_ctx_id_t ctx,
 471                            gss_name_t target GSSEAP_UNUSED,
 472                            gss_OID mech GSSEAP_UNUSED,
 473                            OM_uint32 reqFlags GSSEAP_UNUSED,
 474                            OM_uint32 timeReq GSSEAP_UNUSED,
 475                            gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 476                            gss_buffer_t inputToken,
 477                            gss_buffer_t outputToken,
 478                            OM_uint32 *smFlags)
 479 {
 480     OM_uint32 major, tmpMinor;
 481     struct rs_connection *rconn;
 482     struct rs_request *request = NULL;
 483     struct rs_packet *req = NULL, *resp = NULL;
 484     struct radius_packet *frreq, *frresp;
 485
 486     if (ctx->acceptorCtx.radContext == NULL) {
 487         /* May be NULL from an imported partial context */
 488         major = createRadiusHandle(minor, cred, ctx);
 489         if (GSS_ERROR(major))
 490             goto cleanup;
 491     }
 492
 493     if (isIdentityResponseP(inputToken)) {
 494         major = importInitiatorIdentity(minor, ctx, inputToken);
 495         if (GSS_ERROR(major))
 496             return major;
 497     }
 498
 499     rconn = ctx->acceptorCtx.radConn;
 500
 501     if (rs_packet_create_authn_request(rconn, &req, NULL, NULL) != 0) {
 502         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 503         goto cleanup;
 504     }
 505     frreq = rs_packet_frpkt(req);
 506
 507     major = setInitiatorIdentity(minor, ctx, &frreq->vps);
 508     if (GSS_ERROR(major))
 509         goto cleanup;
 510
 511     major = setAcceptorIdentity(minor, ctx, &frreq->vps);
 512     if (GSS_ERROR(major))
 513         goto cleanup;
 514
 515     major = gssEapRadiusAddAvp(minor, &frreq->vps,
 516                                PW_EAP_MESSAGE, 0, inputToken);
 517     if (GSS_ERROR(major))
 518         goto cleanup;
 519
 520     if (ctx->acceptorCtx.state.length != 0) {
 521         major = gssEapRadiusAddAvp(minor, &frreq->vps, PW_STATE, 0,
 522                                    &ctx->acceptorCtx.state);
 523         if (GSS_ERROR(major))
 524             goto cleanup;
 525
 526         gss_release_buffer(&tmpMinor, &ctx->acceptorCtx.state);
 527     }
 528
 529     if (rs_request_create(rconn, &request) != 0) {
 530         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 531         goto cleanup;
 532     }
 533
 534     rs_request_add_reqpkt(request, req);
 535     req = NULL;
 536
 537     if (rs_request_send(request, &resp) != 0) {
 538         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 539         goto cleanup;
 540     }
 541
 542     assert(resp != NULL);
 543
 544     frresp = rs_packet_frpkt(resp);
 545     switch (frresp->code) {
 546     case PW_ACCESS_CHALLENGE:
 547     case PW_AUTHENTICATION_ACK:
 548         break;
 549     case PW_AUTHENTICATION_REJECT:
 550         *minor = GSSEAP_RADIUS_AUTH_FAILURE;
 551         major = GSS_S_DEFECTIVE_CREDENTIAL;
 552         goto cleanup;
 553         break;
 554     default:
 555         *minor = GSSEAP_UNKNOWN_RADIUS_CODE;
 556         major = GSS_S_FAILURE;
 557         goto cleanup;
 558         break;
 559     }
 560
 561     major = gssEapRadiusGetAvp(minor, frresp->vps, PW_EAP_MESSAGE, 0,
 562                                outputToken, TRUE);
 563     if (major == GSS_S_UNAVAILABLE && frresp->code == PW_ACCESS_CHALLENGE) {
 564         *minor = GSSEAP_MISSING_EAP_REQUEST;
 565         major = GSS_S_DEFECTIVE_TOKEN;
 566         goto cleanup;
 567     } else if (GSS_ERROR(major))
 568         goto cleanup;
 569
 570     if (frresp->code == PW_ACCESS_CHALLENGE) {
 571         major = gssEapRadiusGetAvp(minor, frresp->vps, PW_STATE, 0,
 572                                    &ctx->acceptorCtx.state, TRUE);
 573         if (GSS_ERROR(major) && *minor != GSSEAP_NO_SUCH_ATTR)
 574             goto cleanup;
 575     } else {
 576         ctx->acceptorCtx.vps = frresp->vps;
 577         frresp->vps = NULL;
 578
 579         major = acceptReadyEap(minor, ctx, cred);
 580         if (GSS_ERROR(major))
 581             goto cleanup;
 582
 583         GSSEAP_SM_TRANSITION_NEXT(ctx);
 584     }
 585
 586     major = GSS_S_CONTINUE_NEEDED;
 587     *minor = 0;
 588     *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 589
 590 cleanup:
 591     if (request != NULL)
 592         rs_request_destroy(request);
 593     if (req != NULL)
 594         rs_packet_destroy(req);
 595     if (resp != NULL)
 596         rs_packet_destroy(resp);
 597     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIATOR_EXTS) {
 598         assert(major == GSS_S_CONTINUE_NEEDED);
 599
 600         rs_conn_destroy(ctx->acceptorCtx.radConn);
 601         ctx->acceptorCtx.radConn = NULL;
 602     }
 603
 604     return major;
 605 }
 606
 607 static OM_uint32
 608 eapGssSmAcceptGssChannelBindings(OM_uint32 *minor,
 609                                  gss_cred_id_t cred GSSEAP_UNUSED,
 610                                  gss_ctx_id_t ctx,
 611                                  gss_name_t target GSSEAP_UNUSED,
 612                                  gss_OID mech GSSEAP_UNUSED,
 613                                  OM_uint32 reqFlags GSSEAP_UNUSED,
 614                                  OM_uint32 timeReq GSSEAP_UNUSED,
 615                                  gss_channel_bindings_t chanBindings,
 616                                  gss_buffer_t inputToken,
 617                                  gss_buffer_t outputToken GSSEAP_UNUSED,
 618                                  OM_uint32 *smFlags GSSEAP_UNUSED)
 619 {
 620     OM_uint32 major, tmpMinor;
 621     gss_iov_buffer_desc iov[2];
 622
 623     iov[0].type = GSS_IOV_BUFFER_TYPE_DATA | GSS_IOV_BUFFER_FLAG_ALLOCATE;
 624     iov[0].buffer.length = 0;
 625     iov[0].buffer.value = NULL;
 626
 627     iov[1].type = GSS_IOV_BUFFER_TYPE_STREAM;
 628     iov[1].buffer = *inputToken;
 629
 630     major = gssEapUnwrapOrVerifyMIC(minor, ctx, NULL, NULL,
 631                                     iov, 2, TOK_TYPE_WRAP);
 632     if (GSS_ERROR(major))
 633         return major;
 634
 635     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS &&
 636         !bufferEqual(&iov[0].buffer, &chanBindings->application_data)) {
 637         major = GSS_S_BAD_BINDINGS;
 638         *minor = GSSEAP_BINDINGS_MISMATCH;
 639     } else {
 640         major = GSS_S_CONTINUE_NEEDED;
 641         *minor = 0;
 642     }
 643
 644     gss_release_buffer(&tmpMinor, &iov[0].buffer);
 645
 646     return major;
 647 }
 648
 649 #ifdef GSSEAP_ENABLE_REAUTH
 650 static OM_uint32
 651 eapGssSmAcceptReauthCreds(OM_uint32 *minor,
 652                           gss_cred_id_t cred,
 653                           gss_ctx_id_t ctx,
 654                           gss_name_t target GSSEAP_UNUSED,
 655                           gss_OID mech GSSEAP_UNUSED,
 656                           OM_uint32 reqFlags GSSEAP_UNUSED,
 657                           OM_uint32 timeReq GSSEAP_UNUSED,
 658                           gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 659                           gss_buffer_t inputToken GSSEAP_UNUSED,
 660                           gss_buffer_t outputToken,
 661                           OM_uint32 *smFlags GSSEAP_UNUSED)
 662 {
 663     OM_uint32 major;
 664
 665     /*
 666      * If we're built with fast reauthentication enabled, then
 667      * fabricate a ticket from the initiator to ourselves.
 668      */
 669     major = gssEapMakeReauthCreds(minor, ctx, cred, outputToken);
 670     if (major == GSS_S_UNAVAILABLE)
 671         major = GSS_S_COMPLETE;
 672     if (major == GSS_S_COMPLETE)
 673         major = GSS_S_CONTINUE_NEEDED;
 674
 675     return major;
 676 }
 677 #endif
 678
 679 static OM_uint32
 680 eapGssSmAcceptCompleteInitiatorExts(OM_uint32 *minor,
 681                                     gss_cred_id_t cred GSSEAP_UNUSED,
 682                                     gss_ctx_id_t ctx,
 683                                     gss_name_t target GSSEAP_UNUSED,
 684                                     gss_OID mech GSSEAP_UNUSED,
 685                                     OM_uint32 reqFlags GSSEAP_UNUSED,
 686                                     OM_uint32 timeReq GSSEAP_UNUSED,
 687                                     gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 688                                     gss_buffer_t inputToken GSSEAP_UNUSED,
 689                                     gss_buffer_t outputToken GSSEAP_UNUSED,
 690                                     OM_uint32 *smFlags GSSEAP_UNUSED)
 691 {
 692     GSSEAP_SM_TRANSITION_NEXT(ctx);
 693
 694     *minor = 0;
 695
 696     return GSS_S_CONTINUE_NEEDED;
 697 }
 698
 699 static OM_uint32
 700 eapGssSmAcceptCompleteAcceptorExts(OM_uint32 *minor,
 701                                    gss_cred_id_t cred GSSEAP_UNUSED,
 702                                    gss_ctx_id_t ctx,
 703                                    gss_name_t target GSSEAP_UNUSED,
 704                                    gss_OID mech GSSEAP_UNUSED,
 705                                    OM_uint32 reqFlags GSSEAP_UNUSED,
 706                                    OM_uint32 timeReq GSSEAP_UNUSED,
 707                                    gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 708                                    gss_buffer_t inputToken GSSEAP_UNUSED,
 709                                    gss_buffer_t outputToken GSSEAP_UNUSED,
 710                                    OM_uint32 *smFlags)
 711 {
 712     GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 713
 714     *minor = 0;
 715     *smFlags |= SM_FLAG_FORCE_SEND_TOKEN;
 716
 717     return GSS_S_COMPLETE;
 718 }
 719
 720 static struct gss_eap_sm eapGssAcceptorSm[] = {
 721     {
 722         ITOK_TYPE_ACCEPTOR_NAME_REQ,
 723         ITOK_TYPE_ACCEPTOR_NAME_RESP,
 724         GSSEAP_STATE_INITIAL,
 725         0,
 726         eapGssSmAcceptAcceptorName
 727     },
 728 #ifdef GSSEAP_DEBUG
 729     {
 730         ITOK_TYPE_VENDOR_INFO,
 731         ITOK_TYPE_NONE,
 732         GSSEAP_STATE_INITIAL,
 733         0,
 734         eapGssSmAcceptVendorInfo,
 735     },
 736 #endif
 737 #ifdef GSSEAP_ENABLE_REAUTH
 738     {
 739         ITOK_TYPE_REAUTH_REQ,
 740         ITOK_TYPE_REAUTH_RESP,
 741         GSSEAP_STATE_INITIAL,
 742         0,
 743         eapGssSmAcceptGssReauth,
 744     },
 745 #endif
 746     {
 747         ITOK_TYPE_NONE,
 748         ITOK_TYPE_EAP_REQ,
 749         GSSEAP_STATE_INITIAL,
 750         SM_ITOK_FLAG_REQUIRED,
 751         eapGssSmAcceptIdentity,
 752     },
 753     {
 754         ITOK_TYPE_EAP_RESP,
 755         ITOK_TYPE_EAP_REQ,
 756         GSSEAP_STATE_AUTHENTICATE,
 757         SM_ITOK_FLAG_REQUIRED,
 758         eapGssSmAcceptAuthenticate
 759     },
 760     {
 761         ITOK_TYPE_GSS_CHANNEL_BINDINGS,
 762         ITOK_TYPE_NONE,
 763         GSSEAP_STATE_INITIATOR_EXTS,
 764         SM_ITOK_FLAG_REQUIRED,
 765         eapGssSmAcceptGssChannelBindings,
 766     },
 767     {
 768         ITOK_TYPE_NONE,
 769         ITOK_TYPE_NONE,
 770         GSSEAP_STATE_INITIATOR_EXTS,
 771         0,
 772         eapGssSmAcceptCompleteInitiatorExts,
 773     },
 774 #ifdef GSSEAP_ENABLE_REAUTH
 775     {
 776         ITOK_TYPE_NONE,
 777         ITOK_TYPE_REAUTH_CREDS,
 778         GSSEAP_STATE_ACCEPTOR_EXTS,
 779         0,
 780         eapGssSmAcceptReauthCreds,
 781     },
 782 #endif
 783     {
 784         ITOK_TYPE_NONE,
 785         ITOK_TYPE_NONE,
 786         GSSEAP_STATE_ACCEPTOR_EXTS,
 787         0,
 788         eapGssSmAcceptCompleteAcceptorExts
 789     },
 790 };
 791
 792 OM_uint32
 793 gss_accept_sec_context(OM_uint32 *minor,
 794                        gss_ctx_id_t *context_handle,
 795                        gss_cred_id_t cred,
 796                        gss_buffer_t input_token,
 797                        gss_channel_bindings_t input_chan_bindings,
 798                        gss_name_t *src_name,
 799                        gss_OID *mech_type,
 800                        gss_buffer_t output_token,
 801                        OM_uint32 *ret_flags,
 802                        OM_uint32 *time_rec,
 803                        gss_cred_id_t *delegated_cred_handle)
 804 {
 805     OM_uint32 major, tmpMinor;
 806     gss_ctx_id_t ctx = *context_handle;
 807
 808     *minor = 0;
 809
 810     output_token->length = 0;
 811     output_token->value = NULL;
 812
 813     if (src_name != NULL)
 814         *src_name = GSS_C_NO_NAME;
 815
 816     if (input_token == GSS_C_NO_BUFFER || input_token->length == 0) {
 817         *minor = GSSEAP_TOK_TRUNC;
 818         return GSS_S_DEFECTIVE_TOKEN;
 819     }
 820
 821     if (ctx == GSS_C_NO_CONTEXT) {
 822         major = gssEapAllocContext(minor, &ctx);
 823         if (GSS_ERROR(major))
 824             return major;
 825
 826         *context_handle = ctx;
 827     }
 828
 829     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 830
 831     if (cred == GSS_C_NO_CREDENTIAL) {
 832         if (ctx->defaultCred == GSS_C_NO_CREDENTIAL) {
 833             major = gssEapAcquireCred(minor,
 834                                       GSS_C_NO_NAME,
 835                                       GSS_C_NO_BUFFER,
 836                                       GSS_C_INDEFINITE,
 837                                       GSS_C_NO_OID_SET,
 838                                       GSS_C_ACCEPT,
 839                                       &ctx->defaultCred,
 840                                       NULL,
 841                                       NULL);
 842             if (GSS_ERROR(major))
 843                 goto cleanup;
 844         }
 845
 846         cred = ctx->defaultCred;
 847     }
 848
 849     GSSEAP_MUTEX_LOCK(&cred->mutex);
 850
 851     if (cred->name != GSS_C_NO_NAME) {
 852         major = gssEapDuplicateName(minor, cred->name, &ctx->acceptorName);
 853         if (GSS_ERROR(major))
 854             goto cleanup;
 855     }
 856
 857     major = gssEapSmStep(minor,
 858                          cred,
 859                          ctx,
 860                          GSS_C_NO_NAME,
 861                          GSS_C_NO_OID,
 862                          0,
 863                          GSS_C_INDEFINITE,
 864                          input_chan_bindings,
 865                          input_token,
 866                          output_token,
 867                          eapGssAcceptorSm,
 868                          sizeof(eapGssAcceptorSm) / sizeof(eapGssAcceptorSm[0]));
 869     if (GSS_ERROR(major))
 870         goto cleanup;
 871
 872     if (mech_type != NULL) {
 873         if (!gssEapInternalizeOid(ctx->mechanismUsed, mech_type))
 874             duplicateOid(&tmpMinor, ctx->mechanismUsed, mech_type);
 875     }
 876     if (ret_flags != NULL)
 877         *ret_flags = ctx->gssFlags;
 878     if (delegated_cred_handle != NULL)
 879         *delegated_cred_handle = GSS_C_NO_CREDENTIAL;
 880
 881     if (major == GSS_S_COMPLETE) {
 882         if (src_name != NULL && ctx->initiatorName != GSS_C_NO_NAME) {
 883             major = gssEapDuplicateName(&tmpMinor, ctx->initiatorName, src_name);
 884             if (GSS_ERROR(major))
 885                 goto cleanup;
 886         }
 887         if (time_rec != NULL) {
 888             major = gssEapContextTime(&tmpMinor, ctx, time_rec);
 889             if (GSS_ERROR(major))
 890                 goto cleanup;
 891         }
 892     }
 893
 894     assert(CTX_IS_ESTABLISHED(ctx) || major == GSS_S_CONTINUE_NEEDED);
 895
 896 cleanup:
 897     if (cred != GSS_C_NO_CREDENTIAL)
 898         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
 899     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 900
 901     if (GSS_ERROR(major))
 902         gssEapReleaseContext(&tmpMinor, context_handle);
 903
 904     return major;
 905 }
 906
 907 #ifdef GSSEAP_ENABLE_REAUTH
 908 static OM_uint32
 909 acceptReadyKrb(OM_uint32 *minor,
 910                gss_ctx_id_t ctx,
 911                gss_cred_id_t cred,
 912                const gss_name_t initiator,
 913                const gss_OID mech,
 914                OM_uint32 timeRec)
 915 {
 916     OM_uint32 major;
 917
 918     major = gssEapGlueToMechName(minor, ctx, initiator, &ctx->initiatorName);
 919     if (GSS_ERROR(major))
 920         return major;
 921
 922     major = gssEapReauthComplete(minor, ctx, cred, mech, timeRec);
 923     if (GSS_ERROR(major))
 924         return major;
 925
 926     *minor = 0;
 927     return GSS_S_COMPLETE;
 928 }
 929
 930 static OM_uint32
 931 eapGssSmAcceptGssReauth(OM_uint32 *minor,
 932                         gss_cred_id_t cred,
 933                         gss_ctx_id_t ctx,
 934                         gss_name_t target GSSEAP_UNUSED,
 935                         gss_OID mech,
 936                         OM_uint32 reqFlags GSSEAP_UNUSED,
 937                         OM_uint32 timeReq GSSEAP_UNUSED,
 938                         gss_channel_bindings_t chanBindings,
 939                         gss_buffer_t inputToken,
 940                         gss_buffer_t outputToken,
 941                         OM_uint32 *smFlags)
 942 {
 943     OM_uint32 major, tmpMinor;
 944     gss_name_t krbInitiator = GSS_C_NO_NAME;
 945     OM_uint32 gssFlags, timeRec = GSS_C_INDEFINITE;
 946
 947     /*
 948      * If we're built with fast reauthentication support, it's valid
 949      * for an initiator to send a GSS reauthentication token as its
 950      * initial context token, causing us to short-circuit the state
 951      * machine and process Kerberos GSS messages instead.
 952      */
 953
 954     ctx->flags |= CTX_FLAG_KRB_REAUTH;
 955
 956     major = gssAcceptSecContext(minor,
 957                                 &ctx->kerberosCtx,
 958                                 cred->krbCred,
 959                                 inputToken,
 960                                 chanBindings,
 961                                 &krbInitiator,
 962                                 &mech,
 963                                 outputToken,
 964                                 &gssFlags,
 965                                 &timeRec,
 966                                 NULL);
 967     if (major == GSS_S_COMPLETE) {
 968         major = acceptReadyKrb(minor, ctx, cred,
 969                                krbInitiator, mech, timeRec);
 970         if (major == GSS_S_COMPLETE) {
 971             GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 972         }
 973         ctx->gssFlags = gssFlags;
 974     } else if (GSS_ERROR(major) &&
 975         (*smFlags & SM_FLAG_INPUT_TOKEN_CRITICAL) == 0) {
 976         /* pretend reauthentication attempt never happened */
 977         gssDeleteSecContext(&tmpMinor, &ctx->kerberosCtx, GSS_C_NO_BUFFER);
 978         ctx->flags &= ~(CTX_FLAG_KRB_REAUTH);
 979         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_INITIAL);
 980         major = GSS_S_CONTINUE_NEEDED;
 981     }
 982
 983     gssReleaseName(&tmpMinor, &krbInitiator);
 984
 985     return major;
 986 }
 987 #endif /* GSSEAP_ENABLE_REAUTH */