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,
  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->mechanismUsed,
  86                              &ctx->initiatorName);
  87     if (GSS_ERROR(major))
  88         return major;
  89
  90     major = gssEapRadiusGetRawAvp(minor, ctx->acceptorCtx.vps,
  91                                   PW_MS_MPPE_SEND_KEY, VENDORPEC_MS, &vp);
  92     if (GSS_ERROR(major)) {
  93         *minor = GSSEAP_KEY_UNAVAILABLE;
  94         return GSS_S_UNAVAILABLE;
  95     }
  96
  97     major = gssEapDeriveRfc3961Key(minor,
  98                                    vp->vp_octets,
  99                                    vp->length,
 100                                    ctx->encryptionType,
 101                                    &ctx->rfc3961Key);
 102     if (GSS_ERROR(major))
 103         return major;
 104
 105     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 106                                        &ctx->checksumType);
 107     if (GSS_ERROR(major))
 108         return major;
 109
 110     major = sequenceInit(minor,
 111                          &ctx->seqState, ctx->recvSeq,
 112                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 113                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 114                          TRUE);
 115     if (GSS_ERROR(major))
 116         return major;
 117
 118     major = gssEapCreateAttrContext(minor, cred, ctx,
 119                                     &ctx->initiatorName->attrCtx,
 120                                     &ctx->expiryTime);
 121     if (GSS_ERROR(major))
 122         return major;
 123
 124     *minor = 0;
 125     return GSS_S_COMPLETE;
 126 }
 127
 128 static OM_uint32
 129 eapGssSmAcceptAcceptorName(OM_uint32 *minor,
 130                            gss_cred_id_t cred GSSEAP_UNUSED,
 131                            gss_ctx_id_t ctx,
 132                            gss_name_t target GSSEAP_UNUSED,
 133                            gss_OID mech GSSEAP_UNUSED,
 134                            OM_uint32 reqFlags GSSEAP_UNUSED,
 135                            OM_uint32 timeReq GSSEAP_UNUSED,
 136                            gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 137                            gss_buffer_t inputToken GSSEAP_UNUSED,
 138                            gss_buffer_t outputToken,
 139                            OM_uint32 *smFlags GSSEAP_UNUSED)
 140 {
 141     OM_uint32 major;
 142
 143     /* XXX TODO import and validate name from inputToken */
 144
 145     if (ctx->acceptorName != GSS_C_NO_NAME) {
 146         /* Send desired target name to acceptor */
 147         major = gssEapDisplayName(minor, ctx->acceptorName,
 148                                   outputToken, NULL);
 149         if (GSS_ERROR(major))
 150             return major;
 151     }
 152
 153     return GSS_S_CONTINUE_NEEDED;
 154 }
 155
 156 #ifdef GSSEAP_DEBUG
 157 static OM_uint32
 158 eapGssSmAcceptVendorInfo(OM_uint32 *minor,
 159                          gss_cred_id_t cred GSSEAP_UNUSED,
 160                          gss_ctx_id_t ctx GSSEAP_UNUSED,
 161                          gss_name_t target GSSEAP_UNUSED,
 162                          gss_OID mech GSSEAP_UNUSED,
 163                          OM_uint32 reqFlags GSSEAP_UNUSED,
 164                          OM_uint32 timeReq GSSEAP_UNUSED,
 165                          gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 166                          gss_buffer_t inputToken,
 167                          gss_buffer_t outputToken GSSEAP_UNUSED,
 168                          OM_uint32 *smFlags GSSEAP_UNUSED)
 169 {
 170     fprintf(stderr, "GSS-EAP: vendor: %.*s\n",
 171             (int)inputToken->length, (char *)inputToken->value);
 172
 173     *minor = 0;
 174     return GSS_S_CONTINUE_NEEDED;
 175 }
 176 #endif
 177
 178
 179 /*
 180  * Emit a identity EAP request to force the initiator (peer) to identify
 181  * itself.
 182  */
 183 static OM_uint32
 184 eapGssSmAcceptIdentity(OM_uint32 *minor,
 185                        gss_cred_id_t cred,
 186                        gss_ctx_id_t ctx,
 187                        gss_name_t target GSSEAP_UNUSED,
 188                        gss_OID mech GSSEAP_UNUSED,
 189                        OM_uint32 reqFlags GSSEAP_UNUSED,
 190                        OM_uint32 timeReq GSSEAP_UNUSED,
 191                        gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 192                        gss_buffer_t inputToken,
 193                        gss_buffer_t outputToken,
 194                        OM_uint32 *smFlags)
 195 {
 196     OM_uint32 major;
 197     struct wpabuf *reqData;
 198     gss_buffer_desc pktBuffer;
 199
 200     if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
 201         *minor = GSSEAP_CRED_MECH_MISMATCH;
 202         return GSS_S_BAD_MECH;
 203     }
 204
 205     if (inputToken != GSS_C_NO_BUFFER && inputToken->length != 0) {
 206         *minor = GSSEAP_WRONG_SIZE;
 207         return GSS_S_DEFECTIVE_TOKEN;
 208     }
 209
 210     reqData = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY, 0,
 211                             EAP_CODE_REQUEST, 0);
 212     if (reqData == NULL) {
 213         *minor = ENOMEM;
 214         return GSS_S_FAILURE;
 215     }
 216
 217     pktBuffer.length = wpabuf_len(reqData);
 218     pktBuffer.value = (void *)wpabuf_head(reqData);
 219
 220     major = duplicateBuffer(minor, &pktBuffer, outputToken);
 221     if (GSS_ERROR(major))
 222         return major;
 223
 224     wpabuf_free(reqData);
 225
 226     GSSEAP_SM_TRANSITION_NEXT(ctx);
 227
 228     *minor = 0;
 229     *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 230
 231     return GSS_S_CONTINUE_NEEDED;
 232 }
 233
 234 /*
 235  * Returns TRUE if the input token contains an EAP identity response.
 236  */
 237 static int
 238 isIdentityResponseP(gss_buffer_t inputToken)
 239 {
 240     struct wpabuf respData;
 241
 242     wpabuf_set(&respData, inputToken->value, inputToken->length);
 243
 244     return (eap_get_type(&respData) == EAP_TYPE_IDENTITY);
 245 }
 246
 247 /*
 248  * Save the asserted initiator identity from the EAP identity response.
 249  */
 250 static OM_uint32
 251 importInitiatorIdentity(OM_uint32 *minor,
 252                         gss_ctx_id_t ctx,
 253                         gss_buffer_t inputToken)
 254 {
 255     OM_uint32 tmpMinor;
 256     struct wpabuf respData;
 257     const unsigned char *pos;
 258     size_t len;
 259     gss_buffer_desc nameBuf;
 260
 261     wpabuf_set(&respData, inputToken->value, inputToken->length);
 262
 263     pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY,
 264                            &respData, &len);
 265     if (pos == NULL) {
 266         *minor = GSSEAP_PEER_BAD_MESSAGE;
 267         return GSS_S_DEFECTIVE_TOKEN;
 268     }
 269
 270     nameBuf.value = (void *)pos;
 271     nameBuf.length = len;
 272
 273     gssEapReleaseName(&tmpMinor, &ctx->initiatorName);
 274
 275     return gssEapImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
 276                             ctx->mechanismUsed, &ctx->initiatorName);
 277 }
 278
 279 /*
 280  * Pass the asserted initiator identity to the authentication server.
 281  */
 282 static OM_uint32
 283 setInitiatorIdentity(OM_uint32 *minor,
 284                      gss_ctx_id_t ctx,
 285                      VALUE_PAIR **vps)
 286 {
 287     OM_uint32 major, tmpMinor;
 288     gss_buffer_desc nameBuf;
 289
 290     /*
 291      * We should have got an EAP identity response, but if we didn't, then
 292      * we will just avoid sending User-Name. Note that radsecproxy requires
 293      * User-Name to be sent on every request (presumably so it can remain
 294      * stateless).
 295      */
 296     if (ctx->initiatorName != GSS_C_NO_NAME) {
 297         major = gssEapDisplayName(minor, ctx->initiatorName, &nameBuf, NULL);
 298         if (GSS_ERROR(major))
 299             return major;
 300
 301         major = gssEapRadiusAddAvp(minor, vps, PW_USER_NAME, 0, &nameBuf);
 302         if (GSS_ERROR(major))
 303             return major;
 304
 305         gss_release_buffer(&tmpMinor, &nameBuf);
 306     }
 307
 308     *minor = 0;
 309     return GSS_S_COMPLETE;
 310 }
 311
 312 /*
 313  * Pass the asserted acceptor identity to the authentication server.
 314  */
 315 static OM_uint32
 316 setAcceptorIdentity(OM_uint32 *minor,
 317                     gss_ctx_id_t ctx,
 318                     VALUE_PAIR **vps)
 319 {
 320     OM_uint32 major;
 321     gss_buffer_desc nameBuf;
 322     krb5_context krbContext = NULL;
 323     krb5_principal krbPrinc;
 324     struct rs_context *rc = ctx->acceptorCtx.radContext;
 325
 326     assert(rc != NULL);
 327
 328     if (ctx->acceptorName == GSS_C_NO_NAME) {
 329         *minor = 0;
 330         return GSS_S_COMPLETE;
 331     }
 332
 333     if ((ctx->acceptorName->flags & NAME_FLAG_SERVICE) == 0) {
 334         *minor = GSSEAP_BAD_SERVICE_NAME;
 335         return GSS_S_BAD_NAME;
 336     }
 337
 338     GSSEAP_KRB_INIT(&krbContext);
 339
 340     krbPrinc = ctx->acceptorName->krbPrincipal;
 341     assert(krbPrinc != NULL);
 342     assert(KRB_PRINC_LENGTH(krbPrinc) >= 2);
 343
 344     /* Acceptor-Service-Name */
 345     krbPrincComponentToGssBuffer(krbPrinc, 0, &nameBuf);
 346
 347     major = gssEapRadiusAddAvp(minor, vps,
 348                                PW_GSS_ACCEPTOR_SERVICE_NAME,
 349                                VENDORPEC_UKERNA,
 350                                &nameBuf);
 351     if (GSS_ERROR(major))
 352         return major;
 353
 354     /* Acceptor-Host-Name */
 355     krbPrincComponentToGssBuffer(krbPrinc, 1, &nameBuf);
 356
 357     major = gssEapRadiusAddAvp(minor, vps,
 358                                PW_GSS_ACCEPTOR_HOST_NAME,
 359                                VENDORPEC_UKERNA,
 360                                &nameBuf);
 361     if (GSS_ERROR(major))
 362         return major;
 363
 364     if (KRB_PRINC_LENGTH(krbPrinc) > 2) {
 365         /* Acceptor-Service-Specific */
 366         krb5_principal_data ssiPrinc = *krbPrinc;
 367         char *ssi;
 368
 369         KRB_PRINC_LENGTH(&ssiPrinc) -= 2;
 370         KRB_PRINC_NAME(&ssiPrinc) += 2;
 371
 372         *minor = krb5_unparse_name_flags(krbContext, &ssiPrinc,
 373                                          KRB5_PRINCIPAL_UNPARSE_NO_REALM, &ssi);
 374         if (*minor != 0)
 375             return GSS_S_FAILURE;
 376
 377         nameBuf.value = ssi;
 378         nameBuf.length = strlen(ssi);
 379
 380         major = gssEapRadiusAddAvp(minor, vps,
 381                                    PW_GSS_ACCEPTOR_SERVICE_SPECIFIC,
 382                                    VENDORPEC_UKERNA,
 383                                    &nameBuf);
 384
 385         if (GSS_ERROR(major)) {
 386             krb5_free_unparsed_name(krbContext, ssi);
 387             return major;
 388         }
 389         krb5_free_unparsed_name(krbContext, ssi);
 390     }
 391
 392     krbPrincRealmToGssBuffer(krbPrinc, &nameBuf);
 393     if (nameBuf.length != 0) {
 394         /* Acceptor-Realm-Name */
 395         major = gssEapRadiusAddAvp(minor, vps,
 396                                    PW_GSS_ACCEPTOR_REALM_NAME,
 397                                    VENDORPEC_UKERNA,
 398                                    &nameBuf);
 399         if (GSS_ERROR(major))
 400             return major;
 401     }
 402
 403     *minor = 0;
 404     return GSS_S_COMPLETE;
 405 }
 406
 407 /*
 408  * Allocate a RadSec handle
 409  */
 410 static OM_uint32
 411 createRadiusHandle(OM_uint32 *minor,
 412                    gss_cred_id_t cred,
 413                    gss_ctx_id_t ctx)
 414 {
 415     struct gss_eap_acceptor_ctx *actx = &ctx->acceptorCtx;
 416     const char *configFile = RS_CONFIG_FILE;
 417     const char *configStanza = "gss-eap";
 418     struct rs_alloc_scheme ralloc;
 419     struct rs_error *err;
 420
 421     assert(actx->radContext == NULL);
 422     assert(actx->radConn == NULL);
 423
 424     if (rs_context_create(&actx->radContext, RS_DICT_FILE) != 0) {
 425         *minor = GSSEAP_RADSEC_CONTEXT_FAILURE;
 426         return GSS_S_FAILURE;
 427     }
 428
 429     if (cred->radiusConfigFile != NULL)
 430         configFile = cred->radiusConfigFile;
 431     if (cred->radiusConfigStanza != NULL)
 432         configStanza = cred->radiusConfigStanza;
 433
 434     ralloc.calloc  = GSSEAP_CALLOC;
 435     ralloc.malloc  = GSSEAP_MALLOC;
 436     ralloc.free    = GSSEAP_FREE;
 437     ralloc.realloc = GSSEAP_REALLOC;
 438
 439     rs_context_set_alloc_scheme(actx->radContext, &ralloc);
 440
 441     if (rs_context_read_config(actx->radContext, configFile) != 0) {
 442         err = rs_err_ctx_pop(actx->radContext);
 443         goto fail;
 444     }
 445
 446     if (rs_conn_create(actx->radContext, &actx->radConn, configStanza) != 0) {
 447         err = rs_err_conn_pop(actx->radConn);
 448         goto fail;
 449     }
 450
 451     if (actx->radServer != NULL) {
 452         if (rs_conn_select_peer(actx->radConn, actx->radServer) != 0) {
 453             err = rs_err_conn_pop(actx->radConn);
 454             goto fail;
 455         }
 456     }
 457
 458     *minor = 0;
 459     return GSS_S_COMPLETE;
 460
 461 fail:
 462     return gssEapRadiusMapError(minor, err);
 463 }
 464
 465 /*
 466  * Process a EAP response from the initiator.
 467  */
 468 static OM_uint32
 469 eapGssSmAcceptAuthenticate(OM_uint32 *minor,
 470                            gss_cred_id_t cred,
 471                            gss_ctx_id_t ctx,
 472                            gss_name_t target GSSEAP_UNUSED,
 473                            gss_OID mech GSSEAP_UNUSED,
 474                            OM_uint32 reqFlags GSSEAP_UNUSED,
 475                            OM_uint32 timeReq GSSEAP_UNUSED,
 476                            gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 477                            gss_buffer_t inputToken,
 478                            gss_buffer_t outputToken,
 479                            OM_uint32 *smFlags)
 480 {
 481     OM_uint32 major, tmpMinor;
 482     struct rs_connection *rconn;
 483     struct rs_request *request = NULL;
 484     struct rs_packet *req = NULL, *resp = NULL;
 485     struct radius_packet *frreq, *frresp;
 486
 487     if (ctx->acceptorCtx.radContext == NULL) {
 488         /* May be NULL from an imported partial context */
 489         major = createRadiusHandle(minor, cred, ctx);
 490         if (GSS_ERROR(major))
 491             goto cleanup;
 492     }
 493
 494     if (isIdentityResponseP(inputToken)) {
 495         major = importInitiatorIdentity(minor, ctx, inputToken);
 496         if (GSS_ERROR(major))
 497             return major;
 498     }
 499
 500     rconn = ctx->acceptorCtx.radConn;
 501
 502     if (rs_packet_create_authn_request(rconn, &req, NULL, NULL) != 0) {
 503         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 504         goto cleanup;
 505     }
 506     frreq = rs_packet_frpkt(req);
 507
 508     major = setInitiatorIdentity(minor, ctx, &frreq->vps);
 509     if (GSS_ERROR(major))
 510         goto cleanup;
 511
 512     major = setAcceptorIdentity(minor, ctx, &frreq->vps);
 513     if (GSS_ERROR(major))
 514         goto cleanup;
 515
 516     major = gssEapRadiusAddAvp(minor, &frreq->vps,
 517                                PW_EAP_MESSAGE, 0, inputToken);
 518     if (GSS_ERROR(major))
 519         goto cleanup;
 520
 521     if (ctx->acceptorCtx.state.length != 0) {
 522         major = gssEapRadiusAddAvp(minor, &frreq->vps, PW_STATE, 0,
 523                                    &ctx->acceptorCtx.state);
 524         if (GSS_ERROR(major))
 525             goto cleanup;
 526
 527         gss_release_buffer(&tmpMinor, &ctx->acceptorCtx.state);
 528     }
 529
 530     if (rs_request_create(rconn, &request) != 0) {
 531         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 532         goto cleanup;
 533     }
 534
 535     rs_request_add_reqpkt(request, req);
 536     req = NULL;
 537
 538     if (rs_request_send(request, &resp) != 0) {
 539         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 540         goto cleanup;
 541     }
 542
 543     assert(resp != NULL);
 544
 545     frresp = rs_packet_frpkt(resp);
 546     switch (frresp->code) {
 547     case PW_ACCESS_CHALLENGE:
 548     case PW_AUTHENTICATION_ACK:
 549         break;
 550     case PW_AUTHENTICATION_REJECT:
 551         *minor = GSSEAP_RADIUS_AUTH_FAILURE;
 552         major = GSS_S_DEFECTIVE_CREDENTIAL;
 553         goto cleanup;
 554         break;
 555     default:
 556         *minor = GSSEAP_UNKNOWN_RADIUS_CODE;
 557         major = GSS_S_FAILURE;
 558         goto cleanup;
 559         break;
 560     }
 561
 562     major = gssEapRadiusGetAvp(minor, frresp->vps, PW_EAP_MESSAGE, 0,
 563                                outputToken, TRUE);
 564     if (major == GSS_S_UNAVAILABLE && frresp->code == PW_ACCESS_CHALLENGE) {
 565         *minor = GSSEAP_MISSING_EAP_REQUEST;
 566         major = GSS_S_DEFECTIVE_TOKEN;
 567         goto cleanup;
 568     } else if (GSS_ERROR(major))
 569         goto cleanup;
 570
 571     if (frresp->code == PW_ACCESS_CHALLENGE) {
 572         major = gssEapRadiusGetAvp(minor, frresp->vps, PW_STATE, 0,
 573                                    &ctx->acceptorCtx.state, TRUE);
 574         if (GSS_ERROR(major) && *minor != GSSEAP_NO_SUCH_ATTR)
 575             goto cleanup;
 576     } else {
 577         ctx->acceptorCtx.vps = frresp->vps;
 578         frresp->vps = 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     *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 590
 591 cleanup:
 592     if (request != NULL)
 593         rs_request_destroy(request);
 594     if (req != NULL)
 595         rs_packet_destroy(req);
 596     if (resp != NULL)
 597         rs_packet_destroy(resp);
 598     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIATOR_EXTS) {
 599         assert(major == GSS_S_CONTINUE_NEEDED);
 600
 601         rs_conn_destroy(ctx->acceptorCtx.radConn);
 602         ctx->acceptorCtx.radConn = NULL;
 603     }
 604
 605     return major;
 606 }
 607
 608 static OM_uint32
 609 eapGssSmAcceptGssChannelBindings(OM_uint32 *minor,
 610                                  gss_cred_id_t cred GSSEAP_UNUSED,
 611                                  gss_ctx_id_t ctx,
 612                                  gss_name_t target GSSEAP_UNUSED,
 613                                  gss_OID mech GSSEAP_UNUSED,
 614                                  OM_uint32 reqFlags GSSEAP_UNUSED,
 615                                  OM_uint32 timeReq GSSEAP_UNUSED,
 616                                  gss_channel_bindings_t chanBindings,
 617                                  gss_buffer_t inputToken,
 618                                  gss_buffer_t outputToken GSSEAP_UNUSED,
 619                                  OM_uint32 *smFlags GSSEAP_UNUSED)
 620 {
 621     OM_uint32 major, tmpMinor;
 622     gss_iov_buffer_desc iov[2];
 623
 624     iov[0].type = GSS_IOV_BUFFER_TYPE_DATA | GSS_IOV_BUFFER_FLAG_ALLOCATE;
 625     iov[0].buffer.length = 0;
 626     iov[0].buffer.value = NULL;
 627
 628     iov[1].type = GSS_IOV_BUFFER_TYPE_STREAM;
 629     iov[1].buffer = *inputToken;
 630
 631     major = gssEapUnwrapOrVerifyMIC(minor, ctx, NULL, NULL,
 632                                     iov, 2, TOK_TYPE_WRAP);
 633     if (GSS_ERROR(major))
 634         return major;
 635
 636     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS &&
 637         !bufferEqual(&iov[0].buffer, &chanBindings->application_data)) {
 638         major = GSS_S_BAD_BINDINGS;
 639         *minor = GSSEAP_BINDINGS_MISMATCH;
 640     } else {
 641         major = GSS_S_CONTINUE_NEEDED;
 642         *minor = 0;
 643     }
 644
 645     gss_release_buffer(&tmpMinor, &iov[0].buffer);
 646
 647     return major;
 648 }
 649
 650 #ifdef GSSEAP_ENABLE_REAUTH
 651 static OM_uint32
 652 eapGssSmAcceptReauthCreds(OM_uint32 *minor,
 653                           gss_cred_id_t cred,
 654                           gss_ctx_id_t ctx,
 655                           gss_name_t target GSSEAP_UNUSED,
 656                           gss_OID mech GSSEAP_UNUSED,
 657                           OM_uint32 reqFlags GSSEAP_UNUSED,
 658                           OM_uint32 timeReq GSSEAP_UNUSED,
 659                           gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 660                           gss_buffer_t inputToken GSSEAP_UNUSED,
 661                           gss_buffer_t outputToken,
 662                           OM_uint32 *smFlags GSSEAP_UNUSED)
 663 {
 664     OM_uint32 major;
 665
 666     /*
 667      * If we're built with fast reauthentication enabled, then
 668      * fabricate a ticket from the initiator to ourselves.
 669      */
 670     major = gssEapMakeReauthCreds(minor, ctx, cred, outputToken);
 671     if (major == GSS_S_UNAVAILABLE)
 672         major = GSS_S_COMPLETE;
 673     if (major == GSS_S_COMPLETE)
 674         major = GSS_S_CONTINUE_NEEDED;
 675
 676     return major;
 677 }
 678 #endif
 679
 680 static OM_uint32
 681 eapGssSmAcceptCompleteInitiatorExts(OM_uint32 *minor,
 682                                     gss_cred_id_t cred GSSEAP_UNUSED,
 683                                     gss_ctx_id_t ctx,
 684                                     gss_name_t target GSSEAP_UNUSED,
 685                                     gss_OID mech GSSEAP_UNUSED,
 686                                     OM_uint32 reqFlags GSSEAP_UNUSED,
 687                                     OM_uint32 timeReq GSSEAP_UNUSED,
 688                                     gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 689                                     gss_buffer_t inputToken GSSEAP_UNUSED,
 690                                     gss_buffer_t outputToken GSSEAP_UNUSED,
 691                                     OM_uint32 *smFlags GSSEAP_UNUSED)
 692 {
 693     GSSEAP_SM_TRANSITION_NEXT(ctx);
 694
 695     *minor = 0;
 696
 697     return GSS_S_CONTINUE_NEEDED;
 698 }
 699
 700 static OM_uint32
 701 eapGssSmAcceptCompleteAcceptorExts(OM_uint32 *minor,
 702                                    gss_cred_id_t cred GSSEAP_UNUSED,
 703                                    gss_ctx_id_t ctx,
 704                                    gss_name_t target GSSEAP_UNUSED,
 705                                    gss_OID mech GSSEAP_UNUSED,
 706                                    OM_uint32 reqFlags GSSEAP_UNUSED,
 707                                    OM_uint32 timeReq GSSEAP_UNUSED,
 708                                    gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 709                                    gss_buffer_t inputToken GSSEAP_UNUSED,
 710                                    gss_buffer_t outputToken GSSEAP_UNUSED,
 711                                    OM_uint32 *smFlags)
 712 {
 713     GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 714
 715     *minor = 0;
 716     *smFlags |= SM_FLAG_FORCE_SEND_TOKEN;
 717
 718     return GSS_S_COMPLETE;
 719 }
 720
 721 static struct gss_eap_sm eapGssAcceptorSm[] = {
 722     {
 723         ITOK_TYPE_ACCEPTOR_NAME_REQ,
 724         ITOK_TYPE_ACCEPTOR_NAME_RESP,
 725         GSSEAP_STATE_INITIAL,
 726         0,
 727         eapGssSmAcceptAcceptorName
 728     },
 729 #ifdef GSSEAP_DEBUG
 730     {
 731         ITOK_TYPE_VENDOR_INFO,
 732         ITOK_TYPE_NONE,
 733         GSSEAP_STATE_INITIAL,
 734         0,
 735         eapGssSmAcceptVendorInfo,
 736     },
 737 #endif
 738 #ifdef GSSEAP_ENABLE_REAUTH
 739     {
 740         ITOK_TYPE_REAUTH_REQ,
 741         ITOK_TYPE_REAUTH_RESP,
 742         GSSEAP_STATE_INITIAL,
 743         0,
 744         eapGssSmAcceptGssReauth,
 745     },
 746 #endif
 747     {
 748         ITOK_TYPE_NONE,
 749         ITOK_TYPE_EAP_REQ,
 750         GSSEAP_STATE_INITIAL,
 751         SM_ITOK_FLAG_REQUIRED,
 752         eapGssSmAcceptIdentity,
 753     },
 754     {
 755         ITOK_TYPE_EAP_RESP,
 756         ITOK_TYPE_EAP_REQ,
 757         GSSEAP_STATE_AUTHENTICATE,
 758         SM_ITOK_FLAG_REQUIRED,
 759         eapGssSmAcceptAuthenticate
 760     },
 761     {
 762         ITOK_TYPE_GSS_CHANNEL_BINDINGS,
 763         ITOK_TYPE_NONE,
 764         GSSEAP_STATE_INITIATOR_EXTS,
 765         SM_ITOK_FLAG_REQUIRED,
 766         eapGssSmAcceptGssChannelBindings,
 767     },
 768     {
 769         ITOK_TYPE_NONE,
 770         ITOK_TYPE_NONE,
 771         GSSEAP_STATE_INITIATOR_EXTS,
 772         0,
 773         eapGssSmAcceptCompleteInitiatorExts,
 774     },
 775 #ifdef GSSEAP_ENABLE_REAUTH
 776     {
 777         ITOK_TYPE_NONE,
 778         ITOK_TYPE_REAUTH_CREDS,
 779         GSSEAP_STATE_ACCEPTOR_EXTS,
 780         0,
 781         eapGssSmAcceptReauthCreds,
 782     },
 783 #endif
 784     {
 785         ITOK_TYPE_NONE,
 786         ITOK_TYPE_NONE,
 787         GSSEAP_STATE_ACCEPTOR_EXTS,
 788         0,
 789         eapGssSmAcceptCompleteAcceptorExts
 790     },
 791 };
 792
 793 OM_uint32
 794 gss_accept_sec_context(OM_uint32 *minor,
 795                        gss_ctx_id_t *context_handle,
 796                        gss_cred_id_t cred,
 797                        gss_buffer_t input_token,
 798                        gss_channel_bindings_t input_chan_bindings,
 799                        gss_name_t *src_name,
 800                        gss_OID *mech_type,
 801                        gss_buffer_t output_token,
 802                        OM_uint32 *ret_flags,
 803                        OM_uint32 *time_rec,
 804                        gss_cred_id_t *delegated_cred_handle)
 805 {
 806     OM_uint32 major, tmpMinor;
 807     gss_ctx_id_t ctx = *context_handle;
 808
 809     *minor = 0;
 810
 811     output_token->length = 0;
 812     output_token->value = NULL;
 813
 814     if (src_name != NULL)
 815         *src_name = GSS_C_NO_NAME;
 816
 817     if (input_token == GSS_C_NO_BUFFER || input_token->length == 0) {
 818         *minor = GSSEAP_TOK_TRUNC;
 819         return GSS_S_DEFECTIVE_TOKEN;
 820     }
 821
 822     if (ctx == GSS_C_NO_CONTEXT) {
 823         major = gssEapAllocContext(minor, &ctx);
 824         if (GSS_ERROR(major))
 825             return major;
 826
 827         *context_handle = ctx;
 828     }
 829
 830     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 831
 832     if (cred == GSS_C_NO_CREDENTIAL) {
 833         if (ctx->defaultCred == GSS_C_NO_CREDENTIAL) {
 834             major = gssEapAcquireCred(minor,
 835                                       GSS_C_NO_NAME,
 836                                       GSS_C_NO_BUFFER,
 837                                       GSS_C_INDEFINITE,
 838                                       GSS_C_NO_OID_SET,
 839                                       GSS_C_ACCEPT,
 840                                       &ctx->defaultCred,
 841                                       NULL,
 842                                       NULL);
 843             if (GSS_ERROR(major))
 844                 goto cleanup;
 845         }
 846
 847         cred = ctx->defaultCred;
 848     }
 849
 850     GSSEAP_MUTEX_LOCK(&cred->mutex);
 851
 852     if (cred->name != GSS_C_NO_NAME) {
 853         major = gssEapDuplicateName(minor, cred->name, &ctx->acceptorName);
 854         if (GSS_ERROR(major))
 855             goto cleanup;
 856     }
 857
 858     major = gssEapSmStep(minor,
 859                          cred,
 860                          ctx,
 861                          GSS_C_NO_NAME,
 862                          GSS_C_NO_OID,
 863                          0,
 864                          GSS_C_INDEFINITE,
 865                          input_chan_bindings,
 866                          input_token,
 867                          output_token,
 868                          eapGssAcceptorSm,
 869                          sizeof(eapGssAcceptorSm) / sizeof(eapGssAcceptorSm[0]));
 870     if (GSS_ERROR(major))
 871         goto cleanup;
 872
 873     if (mech_type != NULL) {
 874         OM_uint32 tmpMajor;
 875
 876         tmpMajor = gssEapCanonicalizeOid(&tmpMinor, ctx->mechanismUsed, 0, mech_type);
 877         if (GSS_ERROR(tmpMajor)) {
 878             major = tmpMajor;
 879             *minor = tmpMinor;
 880             goto cleanup;
 881         }
 882     }
 883     if (ret_flags != NULL)
 884         *ret_flags = ctx->gssFlags;
 885     if (delegated_cred_handle != NULL)
 886         *delegated_cred_handle = GSS_C_NO_CREDENTIAL;
 887
 888     if (major == GSS_S_COMPLETE) {
 889         if (src_name != NULL && ctx->initiatorName != GSS_C_NO_NAME) {
 890             major = gssEapDuplicateName(&tmpMinor, ctx->initiatorName, src_name);
 891             if (GSS_ERROR(major))
 892                 goto cleanup;
 893         }
 894         if (time_rec != NULL) {
 895             major = gssEapContextTime(&tmpMinor, ctx, time_rec);
 896             if (GSS_ERROR(major))
 897                 goto cleanup;
 898         }
 899     }
 900
 901     assert(CTX_IS_ESTABLISHED(ctx) || major == GSS_S_CONTINUE_NEEDED);
 902
 903 cleanup:
 904     if (cred != GSS_C_NO_CREDENTIAL)
 905         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
 906     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 907
 908     if (GSS_ERROR(major))
 909         gssEapReleaseContext(&tmpMinor, context_handle);
 910
 911     return major;
 912 }
 913
 914 #ifdef GSSEAP_ENABLE_REAUTH
 915 static OM_uint32
 916 acceptReadyKrb(OM_uint32 *minor,
 917                gss_ctx_id_t ctx,
 918                gss_cred_id_t cred,
 919                const gss_name_t initiator,
 920                const gss_OID mech,
 921                OM_uint32 timeRec)
 922 {
 923     OM_uint32 major;
 924
 925     major = gssEapGlueToMechName(minor, ctx, initiator, &ctx->initiatorName);
 926     if (GSS_ERROR(major))
 927         return major;
 928
 929     major = gssEapReauthComplete(minor, ctx, cred, mech, timeRec);
 930     if (GSS_ERROR(major))
 931         return major;
 932
 933     *minor = 0;
 934     return GSS_S_COMPLETE;
 935 }
 936
 937 static OM_uint32
 938 eapGssSmAcceptGssReauth(OM_uint32 *minor,
 939                         gss_cred_id_t cred,
 940                         gss_ctx_id_t ctx,
 941                         gss_name_t target GSSEAP_UNUSED,
 942                         gss_OID mech,
 943                         OM_uint32 reqFlags GSSEAP_UNUSED,
 944                         OM_uint32 timeReq GSSEAP_UNUSED,
 945                         gss_channel_bindings_t chanBindings,
 946                         gss_buffer_t inputToken,
 947                         gss_buffer_t outputToken,
 948                         OM_uint32 *smFlags)
 949 {
 950     OM_uint32 major, tmpMinor;
 951     gss_name_t krbInitiator = GSS_C_NO_NAME;
 952     OM_uint32 gssFlags, timeRec = GSS_C_INDEFINITE;
 953
 954     /*
 955      * If we're built with fast reauthentication support, it's valid
 956      * for an initiator to send a GSS reauthentication token as its
 957      * initial context token, causing us to short-circuit the state
 958      * machine and process Kerberos GSS messages instead.
 959      */
 960
 961     ctx->flags |= CTX_FLAG_KRB_REAUTH;
 962
 963     major = gssAcceptSecContext(minor,
 964                                 &ctx->kerberosCtx,
 965                                 cred->krbCred,
 966                                 inputToken,
 967                                 chanBindings,
 968                                 &krbInitiator,
 969                                 &mech,
 970                                 outputToken,
 971                                 &gssFlags,
 972                                 &timeRec,
 973                                 NULL);
 974     if (major == GSS_S_COMPLETE) {
 975         major = acceptReadyKrb(minor, ctx, cred,
 976                                krbInitiator, mech, timeRec);
 977         if (major == GSS_S_COMPLETE) {
 978             GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 979         }
 980         ctx->gssFlags = gssFlags;
 981     } else if (GSS_ERROR(major) &&
 982         (*smFlags & SM_FLAG_INPUT_TOKEN_CRITICAL) == 0) {
 983         /* pretend reauthentication attempt never happened */
 984         gssDeleteSecContext(&tmpMinor, &ctx->kerberosCtx, GSS_C_NO_BUFFER);
 985         ctx->flags &= ~(CTX_FLAG_KRB_REAUTH);
 986         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_INITIAL);
 987         major = GSS_S_CONTINUE_NEEDED;
 988     }
 989
 990     gssReleaseName(&tmpMinor, &krbInitiator);
 991
 992     return major;
 993 }
 994 #endif /* GSSEAP_ENABLE_REAUTH */