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