www.project-moonshot.org Git - mech_eap.orig/blob - accept_sec_context.c

   1 /*
   2  * Copyright (c) 2011, JANET(UK)
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * 3. Neither the name of JANET(UK) nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 /*
  34  * Establish a security context on the acceptor (server). These functions
  35  * wrap around libradsec and (thus) talk to a RADIUS server or proxy.
  36  */
  37
  38 #include "gssapiP_eap.h"
  39
  40 #ifdef GSSEAP_ENABLE_REAUTH
  41 static OM_uint32
  42 eapGssSmAcceptGssReauth(OM_uint32 *minor,
  43                         gss_cred_id_t cred,
  44                         gss_ctx_id_t ctx,
  45                         gss_name_t target __attribute__((__unused__)),
  46                         gss_OID mech __attribute__((__unused__)),
  47                         OM_uint32 reqFlags __attribute__((__unused__)),
  48                         OM_uint32 timeReq __attribute__((__unused__)),
  49                         gss_channel_bindings_t chanBindings,
  50                         gss_buffer_t inputToken,
  51                         gss_buffer_t outputToken);
  52 #endif
  53
  54 /*
  55  * Mark an acceptor context as ready for cryptographic operations
  56  */
  57 static OM_uint32
  58 acceptReadyEap(OM_uint32 *minor, gss_ctx_id_t ctx, gss_cred_id_t cred)
  59 {
  60     OM_uint32 major, tmpMinor;
  61     VALUE_PAIR *vp;
  62     gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
  63
  64     /* Cache encryption type derived from selected mechanism OID */
  65     major = gssEapOidToEnctype(minor, ctx->mechanismUsed,
  66                                &ctx->encryptionType);
  67     if (GSS_ERROR(major))
  68         return major;
  69
  70     gssEapReleaseName(&tmpMinor, &ctx->initiatorName);
  71
  72     major = gssEapRadiusGetRawAvp(minor, ctx->acceptorCtx.vps,
  73                                   PW_USER_NAME, 0, &vp);
  74     if (major == GSS_S_COMPLETE) {
  75         nameBuf.length = vp->length;
  76         nameBuf.value = vp->vp_strvalue;
  77     } else {
  78         ctx->gssFlags |= GSS_C_ANON_FLAG;
  79     }
  80
  81     major = gssEapImportName(minor, &nameBuf,
  82                              (ctx->gssFlags & GSS_C_ANON_FLAG) ?
  83                                 GSS_C_NT_ANONYMOUS : GSS_C_NT_USER_NAME,
  84                              &ctx->initiatorName);
  85     if (GSS_ERROR(major))
  86         return major;
  87
  88     major = gssEapRadiusGetRawAvp(minor, ctx->acceptorCtx.vps,
  89                                   PW_MS_MPPE_SEND_KEY, VENDORPEC_MS, &vp);
  90     if (GSS_ERROR(major)) {
  91         *minor = GSSEAP_KEY_UNAVAILABLE;
  92         return GSS_S_UNAVAILABLE;
  93     }
  94
  95     major = gssEapDeriveRfc3961Key(minor,
  96                                    vp->vp_octets,
  97                                    vp->length,
  98                                    ctx->encryptionType,
  99                                    &ctx->rfc3961Key);
 100     if (GSS_ERROR(major))
 101         return major;
 102
 103     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 104                                        &ctx->checksumType);
 105     if (GSS_ERROR(major))
 106         return major;
 107
 108     major = sequenceInit(minor,
 109                          &ctx->seqState, ctx->recvSeq,
 110                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 111                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 112                          TRUE);
 113     if (GSS_ERROR(major))
 114         return major;
 115
 116     major = gssEapCreateAttrContext(minor, cred, ctx,
 117                                     &ctx->initiatorName->attrCtx,
 118                                     &ctx->expiryTime);
 119     if (GSS_ERROR(major))
 120         return major;
 121
 122     *minor = 0;
 123     return GSS_S_COMPLETE;
 124 }
 125
 126 /*
 127  * Emit a identity EAP request to force the initiator (peer) to identify
 128  * itself.
 129  */
 130 static OM_uint32
 131 eapGssSmAcceptIdentity(OM_uint32 *minor,
 132                        gss_cred_id_t cred,
 133                        gss_ctx_id_t ctx,
 134                        gss_name_t target __attribute__((__unused__)),
 135                        gss_OID mech __attribute__((__unused__)),
 136                        OM_uint32 reqFlags __attribute__((__unused__)),
 137                        OM_uint32 timeReq __attribute__((__unused__)),
 138                        gss_channel_bindings_t chanBindings __attribute__((__unused__)),
 139                        gss_buffer_t inputToken,
 140                        gss_buffer_t outputToken)
 141 {
 142     OM_uint32 major;
 143     struct wpabuf *reqData;
 144     gss_buffer_desc pktBuffer;
 145
 146     if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
 147         *minor = GSSEAP_CRED_MECH_MISMATCH;
 148         return GSS_S_BAD_MECH;
 149     }
 150
 151     if (inputToken != GSS_C_NO_BUFFER && inputToken->length != 0) {
 152         *minor = GSSEAP_WRONG_SIZE;
 153         return GSS_S_DEFECTIVE_TOKEN;
 154     }
 155
 156     assert(ctx->acceptorName == GSS_C_NO_NAME);
 157
 158     if (cred->name != GSS_C_NO_NAME) {
 159         major = gssEapDuplicateName(minor, cred->name, &ctx->acceptorName);
 160         if (GSS_ERROR(major))
 161             return major;
 162     }
 163
 164     reqData = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY, 0,
 165                             EAP_CODE_REQUEST, 0);
 166     if (reqData == NULL) {
 167         *minor = ENOMEM;
 168         return GSS_S_FAILURE;
 169     }
 170
 171     pktBuffer.length = wpabuf_len(reqData);
 172     pktBuffer.value = (void *)wpabuf_head(reqData);
 173
 174     major = duplicateBuffer(minor, &pktBuffer, outputToken);
 175     if (GSS_ERROR(major))
 176         return major;
 177
 178     wpabuf_free(reqData);
 179
 180     *minor = 0;
 181     return GSS_S_COMPLETE; /* advance state */
 182 }
 183
 184 /*
 185  * Returns TRUE if the input token contains an EAP identity response.
 186  */
 187 static int
 188 isIdentityResponseP(gss_buffer_t inputToken)
 189 {
 190     struct wpabuf respData;
 191
 192     wpabuf_set(&respData, inputToken->value, inputToken->length);
 193
 194     return (eap_get_type(&respData) == EAP_TYPE_IDENTITY);
 195 }
 196
 197 /*
 198  * Save the asserted initiator identity from the EAP identity response.
 199  */
 200 static OM_uint32
 201 importInitiatorIdentity(OM_uint32 *minor,
 202                         gss_ctx_id_t ctx,
 203                         gss_buffer_t inputToken)
 204 {
 205     OM_uint32 tmpMinor;
 206     struct wpabuf respData;
 207     const unsigned char *pos;
 208     size_t len;
 209     gss_buffer_desc nameBuf;
 210
 211     wpabuf_set(&respData, inputToken->value, inputToken->length);
 212
 213     pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY,
 214                            &respData, &len);
 215     if (pos == NULL) {
 216         *minor = GSSEAP_PEER_BAD_MESSAGE;
 217         return GSS_S_DEFECTIVE_TOKEN;
 218     }
 219
 220     nameBuf.value = (void *)pos;
 221     nameBuf.length = len;
 222
 223     gssEapReleaseName(&tmpMinor, &ctx->initiatorName);
 224
 225     return gssEapImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
 226                             &ctx->initiatorName);
 227 }
 228
 229 /*
 230  * Pass the asserted initiator identity to the authentication server.
 231  */
 232 static OM_uint32
 233 setInitiatorIdentity(OM_uint32 *minor,
 234                      gss_ctx_id_t ctx,
 235                      VALUE_PAIR **vps)
 236 {
 237     OM_uint32 major, tmpMinor;
 238     gss_buffer_desc nameBuf;
 239
 240     /*
 241      * We should have got an EAP identity response, but if we didn't, then
 242      * we will just avoid sending User-Name. Note that radsecproxy requires
 243      * User-Name to be sent on every request (presumably so it can remain
 244      * stateless).
 245      */
 246     if (ctx->initiatorName != GSS_C_NO_NAME) {
 247         major = gssEapDisplayName(minor, ctx->initiatorName, &nameBuf, NULL);
 248         if (GSS_ERROR(major))
 249             return major;
 250
 251         major = gssEapRadiusAddAvp(minor, vps, PW_USER_NAME, 0, &nameBuf);
 252         if (GSS_ERROR(major))
 253             return major;
 254
 255         gss_release_buffer(&tmpMinor, &nameBuf);
 256     }
 257
 258     *minor = 0;
 259     return GSS_S_COMPLETE;
 260 }
 261
 262 /*
 263  * Pass the asserted acceptor identity to the authentication server.
 264  */
 265 static OM_uint32
 266 setAcceptorIdentity(OM_uint32 *minor,
 267                     gss_ctx_id_t ctx,
 268                     VALUE_PAIR **vps)
 269 {
 270     OM_uint32 major;
 271     gss_buffer_desc nameBuf;
 272     krb5_context krbContext = NULL;
 273     krb5_principal krbPrinc;
 274     struct rs_context *rc = ctx->acceptorCtx.radContext;
 275
 276     assert(rc != NULL);
 277
 278     if (ctx->acceptorName == GSS_C_NO_NAME) {
 279         *minor = 0;
 280         return GSS_S_COMPLETE;
 281     }
 282
 283     if ((ctx->acceptorName->flags & NAME_FLAG_SERVICE) == 0) {
 284         *minor = GSSEAP_BAD_SERVICE_NAME;
 285         return GSS_S_BAD_NAME;
 286     }
 287
 288     GSSEAP_KRB_INIT(&krbContext);
 289
 290     krbPrinc = ctx->acceptorName->krbPrincipal;
 291     assert(krbPrinc != NULL);
 292     assert(KRB_PRINC_LENGTH(krbPrinc) >= 2);
 293
 294     /* Acceptor-Service-Name */
 295     krbPrincComponentToGssBuffer(krbPrinc, 0, &nameBuf);
 296
 297     major = gssEapRadiusAddAvp(minor, vps,
 298                                PW_GSS_ACCEPTOR_SERVICE_NAME,
 299                                VENDORPEC_UKERNA,
 300                                &nameBuf);
 301     if (GSS_ERROR(major))
 302         return major;
 303
 304     /* Acceptor-Host-Name */
 305     krbPrincComponentToGssBuffer(krbPrinc, 1, &nameBuf);
 306
 307     major = gssEapRadiusAddAvp(minor, vps,
 308                                PW_GSS_ACCEPTOR_HOST_NAME,
 309                                VENDORPEC_UKERNA,
 310                                &nameBuf);
 311     if (GSS_ERROR(major))
 312         return major;
 313
 314     if (KRB_PRINC_LENGTH(krbPrinc) > 2) {
 315         /* Acceptor-Service-Specific */
 316         krb5_principal_data ssiPrinc = *krbPrinc;
 317         char *ssi;
 318
 319         KRB_PRINC_LENGTH(&ssiPrinc) -= 2;
 320         KRB_PRINC_NAME(&ssiPrinc) += 2;
 321
 322         *minor = krb5_unparse_name_flags(krbContext, &ssiPrinc,
 323                                          KRB5_PRINCIPAL_UNPARSE_NO_REALM, &ssi);
 324         if (*minor != 0)
 325             return GSS_S_FAILURE;
 326
 327         nameBuf.value = ssi;
 328         nameBuf.length = strlen(ssi);
 329
 330         major = gssEapRadiusAddAvp(minor, vps,
 331                                    PW_GSS_ACCEPTOR_SERVICE_SPECIFIC,
 332                                    VENDORPEC_UKERNA,
 333                                    &nameBuf);
 334
 335         if (GSS_ERROR(major)) {
 336             krb5_free_unparsed_name(krbContext, ssi);
 337             return major;
 338         }
 339         krb5_free_unparsed_name(krbContext, ssi);
 340     }
 341
 342     krbPrincRealmToGssBuffer(krbPrinc, &nameBuf);
 343     if (nameBuf.length != 0) {
 344         /* Acceptor-Realm-Name */
 345         major = gssEapRadiusAddAvp(minor, vps,
 346                                    PW_GSS_ACCEPTOR_REALM_NAME,
 347                                    VENDORPEC_UKERNA,
 348                                    &nameBuf);
 349         if (GSS_ERROR(major))
 350             return major;
 351     }
 352
 353     *minor = 0;
 354     return GSS_S_COMPLETE;
 355 }
 356
 357 /*
 358  * Allocate a RadSec handle
 359  */
 360 static OM_uint32
 361 createRadiusHandle(OM_uint32 *minor,
 362                    gss_cred_id_t cred,
 363                    gss_ctx_id_t ctx)
 364 {
 365     struct gss_eap_acceptor_ctx *actx = &ctx->acceptorCtx;
 366     const char *configFile = RS_CONFIG_FILE;
 367     const char *configStanza = "gss-eap";
 368     struct rs_alloc_scheme ralloc;
 369     struct rs_error *err;
 370
 371     assert(actx->radContext == NULL);
 372     assert(actx->radConn == NULL);
 373
 374     if (rs_context_create(&actx->radContext, RS_DICT_FILE) != 0) {
 375         *minor = GSSEAP_RADSEC_CONTEXT_FAILURE;
 376         return GSS_S_FAILURE;
 377     }
 378
 379     if (cred->radiusConfigFile != NULL)
 380         configFile = cred->radiusConfigFile;
 381     if (cred->radiusConfigStanza != NULL)
 382         configStanza = cred->radiusConfigStanza;
 383
 384     ralloc.calloc  = GSSEAP_CALLOC;
 385     ralloc.malloc  = GSSEAP_MALLOC;
 386     ralloc.free    = GSSEAP_FREE;
 387     ralloc.realloc = GSSEAP_REALLOC;
 388
 389     rs_context_set_alloc_scheme(actx->radContext, &ralloc);
 390
 391     if (rs_context_read_config(actx->radContext, configFile) != 0) {
 392         err = rs_err_ctx_pop(actx->radContext);
 393         goto fail;
 394     }
 395
 396     if (rs_conn_create(actx->radContext, &actx->radConn, configStanza) != 0) {
 397         err = rs_err_conn_pop(actx->radConn);
 398         goto fail;
 399     }
 400
 401     if (actx->radServer != NULL) {
 402         if (rs_conn_select_peer(actx->radConn, actx->radServer) != 0) {
 403             err = rs_err_conn_pop(actx->radConn);
 404             goto fail;
 405         }
 406     }
 407
 408     *minor = 0;
 409     return GSS_S_COMPLETE;
 410
 411 fail:
 412     return gssEapRadiusMapError(minor, err);
 413 }
 414
 415 /*
 416  * Process a EAP response from the initiator.
 417  */
 418 static OM_uint32
 419 eapGssSmAcceptAuthenticate(OM_uint32 *minor,
 420                            gss_cred_id_t cred,
 421                            gss_ctx_id_t ctx,
 422                            gss_name_t target __attribute__((__unused__)),
 423                            gss_OID mech __attribute__((__unused__)),
 424                            OM_uint32 reqFlags __attribute__((__unused__)),
 425                            OM_uint32 timeReq __attribute__((__unused__)),
 426                            gss_channel_bindings_t chanBindings,
 427                            gss_buffer_t inputToken,
 428                            gss_buffer_t outputToken)
 429 {
 430     OM_uint32 major, tmpMinor;
 431     struct rs_connection *rconn;
 432     struct rs_request *request = NULL;
 433     struct rs_packet *req = NULL, *resp = NULL;
 434     struct radius_packet *frreq, *frresp;
 435
 436     if (ctx->acceptorCtx.radContext == NULL) {
 437         /* May be NULL from an imported partial context */
 438         major = createRadiusHandle(minor, cred, ctx);
 439         if (GSS_ERROR(major))
 440             goto cleanup;
 441     }
 442
 443     if (isIdentityResponseP(inputToken)) {
 444         major = importInitiatorIdentity(minor, ctx, inputToken);
 445         if (GSS_ERROR(major))
 446             return major;
 447     }
 448
 449     rconn = ctx->acceptorCtx.radConn;
 450
 451     if (rs_packet_create_authn_request(rconn, &req, NULL, NULL) != 0) {
 452         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 453         goto cleanup;
 454     }
 455     frreq = rs_packet_frpkt(req);
 456
 457     major = setInitiatorIdentity(minor, ctx, &frreq->vps);
 458     if (GSS_ERROR(major))
 459         goto cleanup;
 460
 461     major = setAcceptorIdentity(minor, ctx, &frreq->vps);
 462     if (GSS_ERROR(major))
 463         goto cleanup;
 464
 465     major = gssEapRadiusAddAvp(minor, &frreq->vps,
 466                                PW_EAP_MESSAGE, 0, inputToken);
 467     if (GSS_ERROR(major))
 468         goto cleanup;
 469
 470     if (ctx->acceptorCtx.state.length != 0) {
 471         major = gssEapRadiusAddAvp(minor, &frreq->vps, PW_STATE, 0,
 472                                    &ctx->acceptorCtx.state);
 473         if (GSS_ERROR(major))
 474             goto cleanup;
 475
 476         gss_release_buffer(&tmpMinor, &ctx->acceptorCtx.state);
 477     }
 478
 479     if (rs_request_create(rconn, &request) != 0) {
 480         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 481         goto cleanup;
 482     }
 483
 484     rs_request_add_reqpkt(request, req);
 485     req = NULL;
 486
 487     if (rs_request_send(request, &resp) != 0) {
 488         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 489         goto cleanup;
 490     }
 491
 492     assert(resp != NULL);
 493
 494     frresp = rs_packet_frpkt(resp);
 495     switch (frresp->code) {
 496     case PW_AUTHENTICATION_ACK:
 497     case PW_ACCESS_CHALLENGE:
 498         break;
 499     case PW_AUTHENTICATION_REJECT:
 500         *minor = GSSEAP_RADIUS_AUTH_FAILURE;
 501         major = GSS_S_DEFECTIVE_CREDENTIAL;
 502         goto cleanup;
 503         break;
 504     default:
 505         *minor = GSSEAP_UNKNOWN_RADIUS_CODE;
 506         major = GSS_S_FAILURE;
 507         goto cleanup;
 508         break;
 509     }
 510
 511     major = gssEapRadiusGetAvp(minor, frresp->vps, PW_EAP_MESSAGE, 0,
 512                                outputToken, TRUE);
 513     if (major == GSS_S_UNAVAILABLE && frresp->code == PW_ACCESS_CHALLENGE) {
 514         *minor = GSSEAP_MISSING_EAP_REQUEST;
 515         major = GSS_S_DEFECTIVE_TOKEN;
 516         goto cleanup;
 517     } else if (GSS_ERROR(major))
 518         goto cleanup;
 519
 520     if (frresp->code == PW_ACCESS_CHALLENGE) {
 521         major = gssEapRadiusGetAvp(minor, frresp->vps, PW_STATE, 0,
 522                                    &ctx->acceptorCtx.state, TRUE);
 523         if (GSS_ERROR(major) && *minor != GSSEAP_NO_SUCH_ATTR)
 524             goto cleanup;
 525
 526         major = GSS_S_CONTINUE_NEEDED;
 527     } else {
 528         ctx->acceptorCtx.vps = frresp->vps;
 529         frresp->vps = NULL;
 530
 531         rs_conn_destroy(ctx->acceptorCtx.radConn);
 532         ctx->acceptorCtx.radConn = NULL;
 533
 534         major = acceptReadyEap(minor, ctx, cred);
 535         if (GSS_ERROR(major))
 536             goto cleanup;
 537
 538         major = GSS_S_COMPLETE; /* advance state */
 539     }
 540
 541 cleanup:
 542     if (request != NULL)
 543         rs_request_destroy(request);
 544     if (req != NULL)
 545         rs_packet_destroy(req);
 546
 547     return major;
 548 }
 549
 550 static OM_uint32
 551 eapGssSmAcceptGssChannelBindings(OM_uint32 *minor,
 552                                  gss_cred_id_t cred,
 553                                  gss_ctx_id_t ctx,
 554                                  gss_name_t target __attribute__((__unused__)),
 555                                  gss_OID mech __attribute__((__unused__)),
 556                                  OM_uint32 reqFlags __attribute__((__unused__)),
 557                                  OM_uint32 timeReq __attribute__((__unused__)),
 558                                  gss_channel_bindings_t chanBindings,
 559                                  gss_buffer_t inputToken,
 560                                  gss_buffer_t outputToken)
 561 {
 562     OM_uint32 major, tmpMinor;
 563     gss_iov_buffer_desc iov[2];
 564
 565     iov[0].type = GSS_IOV_BUFFER_TYPE_DATA | GSS_IOV_BUFFER_FLAG_ALLOCATE;
 566     iov[0].buffer.length = 0;
 567     iov[0].buffer.value = NULL;
 568
 569     iov[1].type = GSS_IOV_BUFFER_TYPE_STREAM;
 570     iov[1].buffer = *inputToken;
 571
 572     major = gssEapUnwrapOrVerifyMIC(minor, ctx, NULL, NULL,
 573                                     iov, 2, TOK_TYPE_WRAP);
 574     if (GSS_ERROR(major))
 575         return GSS_S_BAD_BINDINGS;
 576
 577     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS &&
 578         !bufferEqual(&iov[0].buffer, &chanBindings->application_data)) {
 579         major = GSS_S_BAD_BINDINGS;
 580         *minor = GSSEAP_BINDINGS_MISMATCH;
 581     } else {
 582         major = GSS_S_CONTINUE_NEEDED; /* process additional extensions */
 583         *minor = 0;
 584     }
 585
 586     gss_release_buffer(&tmpMinor, &iov[0].buffer);
 587
 588     return major;
 589 }
 590
 591 #ifdef GSSEAP_ENABLE_REAUTH
 592 static OM_uint32
 593 eapGssSmAcceptReauthCreds(OM_uint32 *minor,
 594                           gss_cred_id_t cred,
 595                           gss_ctx_id_t ctx,
 596                           gss_name_t target __attribute__((__unused__)),
 597                           gss_OID mech __attribute__((__unused__)),
 598                           OM_uint32 reqFlags __attribute__((__unused__)),
 599                           OM_uint32 timeReq __attribute__((__unused__)),
 600                           gss_channel_bindings_t chanBindings __attribute__((__unused__)),
 601                           gss_buffer_t inputToken,
 602                           gss_buffer_t outputToken)
 603 {
 604     OM_uint32 major;
 605
 606     /*
 607      * If we're built with fast reauthentication enabled, then
 608      * fabricate a ticket from the initiator to ourselves.
 609      */
 610     major = gssEapMakeReauthCreds(minor, ctx, cred, outputToken);
 611     if (GSS_ERROR(major))
 612         return major;
 613
 614     *minor = 0;
 615     return GSS_S_CONTINUE_NEEDED; /* process additional extensions */
 616 }
 617 #endif
 618
 619 static OM_uint32
 620 eapGssSmAcceptNegoExtFinished(OM_uint32 *minor,
 621                               gss_cred_id_t cred,
 622                               gss_ctx_id_t ctx,
 623                               gss_name_t target __attribute__((__unused__)),
 624                               gss_OID mech __attribute__((__unused__)),
 625                               OM_uint32 reqFlags __attribute__((__unused__)),
 626                               OM_uint32 timeReq __attribute__((__unused__)),
 627                               gss_channel_bindings_t chanBindings __attribute__((__unused__)),
 628                               gss_buffer_t inputToken,
 629                               gss_buffer_t outputToken)
 630 {
 631     *minor = 0;
 632     return GSS_S_COMPLETE; /* advance state */
 633 }
 634
 635 static struct gss_eap_sm eapGssAcceptorSm[] = {
 636 #ifdef GSSEAP_ENABLE_REAUTH
 637     {
 638         ITOK_TYPE_REAUTH_REQ,
 639         ITOK_TYPE_REAUTH_RESP,
 640         GSSEAP_STATE_INITIAL,
 641         0, /* critical */
 642         0, /* required */
 643         eapGssSmAcceptGssReauth,
 644     },
 645 #endif
 646     {
 647         ITOK_TYPE_NONE,
 648         ITOK_TYPE_EAP_REQ,
 649         GSSEAP_STATE_INITIAL,
 650         1, /* critical */
 651         1, /* required */
 652         eapGssSmAcceptIdentity,
 653     },
 654     {
 655         ITOK_TYPE_EAP_RESP,
 656         ITOK_TYPE_EAP_REQ,
 657         GSSEAP_STATE_AUTHENTICATE,
 658         1, /* critical */
 659         1, /* required */
 660         eapGssSmAcceptAuthenticate
 661     },
 662     {
 663         ITOK_TYPE_GSS_CHANNEL_BINDINGS,
 664         ITOK_TYPE_NONE,
 665         GSSEAP_STATE_NEGO_EXT,
 666         1, /* critical */
 667         1, /* required */
 668         eapGssSmAcceptGssChannelBindings,
 669     },
 670     {
 671         ITOK_TYPE_NONE,
 672         ITOK_TYPE_REAUTH_CREDS,
 673         GSSEAP_STATE_NEGO_EXT,
 674         0, /* critical */
 675         0, /* required */
 676         eapGssSmAcceptReauthCreds,
 677     },
 678     {
 679         ITOK_TYPE_NONE,
 680         ITOK_TYPE_NONE,
 681         GSSEAP_STATE_NEGO_EXT,
 682         1, /* critical */
 683         1, /* required */
 684         eapGssSmAcceptNegoExtFinished
 685     },
 686 };
 687
 688 OM_uint32
 689 gss_accept_sec_context(OM_uint32 *minor,
 690                        gss_ctx_id_t *context_handle,
 691                        gss_cred_id_t cred,
 692                        gss_buffer_t input_token,
 693                        gss_channel_bindings_t input_chan_bindings,
 694                        gss_name_t *src_name,
 695                        gss_OID *mech_type,
 696                        gss_buffer_t output_token,
 697                        OM_uint32 *ret_flags,
 698                        OM_uint32 *time_rec,
 699                        gss_cred_id_t *delegated_cred_handle)
 700 {
 701     OM_uint32 major, tmpMinor;
 702     gss_ctx_id_t ctx = *context_handle;
 703
 704     *minor = 0;
 705
 706     output_token->length = 0;
 707     output_token->value = NULL;
 708
 709     if (src_name != NULL)
 710         *src_name = GSS_C_NO_NAME;
 711
 712     if (input_token == GSS_C_NO_BUFFER || input_token->length == 0) {
 713         *minor = GSSEAP_TOK_TRUNC;
 714         return GSS_S_DEFECTIVE_TOKEN;
 715     }
 716
 717     if (ctx == GSS_C_NO_CONTEXT) {
 718         major = gssEapAllocContext(minor, &ctx);
 719         if (GSS_ERROR(major))
 720             return major;
 721
 722         *context_handle = ctx;
 723     }
 724
 725     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 726
 727     if (cred == GSS_C_NO_CREDENTIAL) {
 728         if (ctx->defaultCred == GSS_C_NO_CREDENTIAL) {
 729             major = gssEapAcquireCred(minor,
 730                                       GSS_C_NO_NAME,
 731                                       GSS_C_NO_BUFFER,
 732                                       GSS_C_INDEFINITE,
 733                                       GSS_C_NO_OID_SET,
 734                                       GSS_C_ACCEPT,
 735                                       &ctx->defaultCred,
 736                                       NULL,
 737                                       NULL);
 738             if (GSS_ERROR(major))
 739                 goto cleanup;
 740         }
 741
 742         cred = ctx->defaultCred;
 743     }
 744
 745     GSSEAP_MUTEX_LOCK(&cred->mutex);
 746
 747     major = gssEapSmStep(minor,
 748                          cred,
 749                          ctx,
 750                          GSS_C_NO_NAME,
 751                          GSS_C_NO_OID,
 752                          0,
 753                          GSS_C_INDEFINITE,
 754                          input_chan_bindings,
 755                          input_token,
 756                          output_token,
 757                          eapGssAcceptorSm,
 758                          sizeof(eapGssAcceptorSm) / sizeof(eapGssAcceptorSm[0]));
 759     if (GSS_ERROR(major))
 760         goto cleanup;
 761
 762     if (mech_type != NULL) {
 763         if (!gssEapInternalizeOid(ctx->mechanismUsed, mech_type))
 764             duplicateOid(&tmpMinor, ctx->mechanismUsed, mech_type);
 765     }
 766     if (ret_flags != NULL)
 767         *ret_flags = ctx->gssFlags;
 768     if (delegated_cred_handle != NULL)
 769         *delegated_cred_handle = GSS_C_NO_CREDENTIAL;
 770
 771     if (major == GSS_S_COMPLETE) {
 772         if (src_name != NULL && ctx->initiatorName != GSS_C_NO_NAME) {
 773             major = gssEapDuplicateName(&tmpMinor, ctx->initiatorName, src_name);
 774             if (GSS_ERROR(major))
 775                 goto cleanup;
 776         }
 777         if (time_rec != NULL) {
 778             major = gssEapContextTime(&tmpMinor, ctx, time_rec);
 779             if (GSS_ERROR(major))
 780                 goto cleanup;
 781         }
 782     }
 783
 784     assert(ctx->state == GSSEAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
 785
 786 cleanup:
 787     if (cred != GSS_C_NO_CREDENTIAL)
 788         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
 789     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 790
 791     if (GSS_ERROR(major))
 792         gssEapReleaseContext(&tmpMinor, context_handle);
 793
 794     return major;
 795 }
 796
 797 #ifdef GSSEAP_ENABLE_REAUTH
 798 static OM_uint32
 799 acceptReadyKrb(OM_uint32 *minor,
 800                gss_ctx_id_t ctx,
 801                gss_cred_id_t cred,
 802                const gss_name_t initiator,
 803                const gss_OID mech,
 804                OM_uint32 timeRec)
 805 {
 806     OM_uint32 major;
 807
 808     major = gssEapGlueToMechName(minor, ctx, initiator, &ctx->initiatorName);
 809     if (GSS_ERROR(major))
 810         return major;
 811
 812     if (cred->name != GSS_C_NO_NAME) {
 813         major = gssEapDuplicateName(minor, cred->name, &ctx->acceptorName);
 814         if (GSS_ERROR(major))
 815             return major;
 816     }
 817
 818     major = gssEapReauthComplete(minor, ctx, cred, mech, timeRec);
 819     if (GSS_ERROR(major))
 820         return major;
 821
 822     ctx->state = GSSEAP_STATE_NEGO_EXT; /* skip */
 823
 824     *minor = 0;
 825     return GSS_S_COMPLETE; /* advance state */
 826 }
 827
 828 static OM_uint32
 829 eapGssSmAcceptGssReauth(OM_uint32 *minor,
 830                         gss_cred_id_t cred,
 831                         gss_ctx_id_t ctx,
 832                         gss_name_t target __attribute__((__unused__)),
 833                         gss_OID mech,
 834                         OM_uint32 reqFlags __attribute__((__unused__)),
 835                         OM_uint32 timeReq __attribute__((__unused__)),
 836                         gss_channel_bindings_t chanBindings,
 837                         gss_buffer_t inputToken,
 838                         gss_buffer_t outputToken)
 839 {
 840     OM_uint32 major, tmpMinor;
 841     gss_name_t krbInitiator = GSS_C_NO_NAME;
 842     OM_uint32 gssFlags, timeRec = GSS_C_INDEFINITE;
 843
 844     /*
 845      * If we're built with fast reauthentication support, it's valid
 846      * for an initiator to send a GSS reauthentication token as its
 847      * initial context token, causing us to short-circuit the state
 848      * machine and process Kerberos GSS messages instead.
 849      */
 850
 851     ctx->flags |= CTX_FLAG_KRB_REAUTH;
 852
 853     major = gssAcceptSecContext(minor,
 854                                 &ctx->kerberosCtx,
 855                                 cred->krbCred,
 856                                 inputToken,
 857                                 chanBindings,
 858                                 &krbInitiator,
 859                                 &mech,
 860                                 outputToken,
 861                                 &gssFlags,
 862                                 &timeRec,
 863                                 NULL);
 864     if (major == GSS_S_COMPLETE) {
 865         major = acceptReadyKrb(minor, ctx, cred,
 866                                krbInitiator, mech, timeRec);
 867     }
 868
 869     ctx->gssFlags = gssFlags;
 870
 871     gssReleaseName(&tmpMinor, &krbInitiator);
 872
 873     return major;
 874 }
 875 #endif /* GSSEAP_ENABLE_REAUTH */