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