mech_eap/accept_sec_context.c

   1 /*
   2  * Copyright (c) 2011, JANET(UK)
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * 3. Neither the name of JANET(UK) nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 /*
  34  * Establish a security context on the acceptor (server). These functions
  35  * wrap around libradsec and (thus) talk to a RADIUS server or proxy.
  36  */
  37
  38 #include "gssapiP_eap.h"
  39
  40 #ifdef GSSEAP_ENABLE_REAUTH
  41 static OM_uint32
  42 eapGssSmAcceptGssReauth(OM_uint32 *minor,
  43                         gss_cred_id_t cred,
  44                         gss_ctx_id_t ctx,
  45                         gss_name_t target,
  46                         gss_OID mech,
  47                         OM_uint32 reqFlags,
  48                         OM_uint32 timeReq,
  49                         gss_channel_bindings_t chanBindings,
  50                         gss_buffer_t inputToken,
  51                         gss_buffer_t outputToken,
  52                         OM_uint32 *smFlags);
  53 #endif
  54
  55 /*
  56  * Mark an acceptor context as ready for cryptographic operations
  57  */
  58 static OM_uint32
  59 acceptReadyEap(OM_uint32 *minor, gss_ctx_id_t ctx, gss_cred_id_t cred)
  60 {
  61     OM_uint32 major, tmpMinor;
  62     VALUE_PAIR *vp;
  63     gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
  64
  65     /* Cache encryption type derived from selected mechanism OID */
  66     major = gssEapOidToEnctype(minor, ctx->mechanismUsed,
  67                                &ctx->encryptionType);
  68     if (GSS_ERROR(major))
  69         return major;
  70
  71     gssEapReleaseName(&tmpMinor, &ctx->initiatorName);
  72
  73     major = gssEapRadiusGetRawAvp(minor, ctx->acceptorCtx.vps,
  74                                   PW_USER_NAME, 0, &vp);
  75     if (major == GSS_S_COMPLETE && vp->length) {
  76         nameBuf.length = vp->length;
  77         nameBuf.value = vp->vp_strvalue;
  78     } else {
  79         ctx->gssFlags |= GSS_C_ANON_FLAG;
  80     }
  81
  82     major = gssEapImportName(minor, &nameBuf,
  83                              (ctx->gssFlags & GSS_C_ANON_FLAG) ?
  84                                 GSS_C_NT_ANONYMOUS : GSS_C_NT_USER_NAME,
  85                              ctx->mechanismUsed,
  86                              &ctx->initiatorName);
  87     if (GSS_ERROR(major))
  88         return major;
  89
  90     major = gssEapRadiusGetRawAvp(minor, ctx->acceptorCtx.vps,
  91                                   PW_MS_MPPE_SEND_KEY, VENDORPEC_MS, &vp);
  92     if (GSS_ERROR(major)) {
  93         *minor = GSSEAP_KEY_UNAVAILABLE;
  94         return GSS_S_UNAVAILABLE;
  95     }
  96
  97     major = gssEapDeriveRfc3961Key(minor,
  98                                    vp->vp_octets,
  99                                    vp->length,
 100                                    ctx->encryptionType,
 101                                    &ctx->rfc3961Key);
 102     if (GSS_ERROR(major))
 103         return major;
 104
 105     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 106                                        &ctx->checksumType);
 107     if (GSS_ERROR(major))
 108         return major;
 109
 110     major = sequenceInit(minor,
 111                          &ctx->seqState, ctx->recvSeq,
 112                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 113                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 114                          TRUE);
 115     if (GSS_ERROR(major))
 116         return major;
 117
 118     major = gssEapCreateAttrContext(minor, cred, ctx,
 119                                     &ctx->initiatorName->attrCtx,
 120                                     &ctx->expiryTime);
 121     if (GSS_ERROR(major))
 122         return major;
 123
 124     if (ctx->expiryTime < time(NULL)) {
 125         *minor = GSSEAP_CRED_EXPIRED;
 126         return GSS_S_CREDENTIALS_EXPIRED;
 127     }
 128
 129     *minor = 0;
 130     return GSS_S_COMPLETE;
 131 }
 132
 133 static OM_uint32
 134 gssEapSupportedInitiatorExts[] = {
 135 };
 136
 137 static struct gss_eap_itok_map
 138 gssEapAcceptorExtsFlagMap[] = {
 139     { ITOK_TYPE_REAUTH_CREDS, CTX_FLAG_KRB_REAUTH_SUPPORTED },
 140 };
 141
 142 static OM_uint32
 143 eapGssSmAcceptExts(OM_uint32 *minor,
 144                    gss_cred_id_t cred GSSEAP_UNUSED,
 145                    gss_ctx_id_t ctx GSSEAP_UNUSED,
 146                    gss_name_t target GSSEAP_UNUSED,
 147                    gss_OID mech GSSEAP_UNUSED,
 148                    OM_uint32 reqFlags GSSEAP_UNUSED,
 149                    OM_uint32 timeReq GSSEAP_UNUSED,
 150                    gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 151                    gss_buffer_t inputToken,
 152                    gss_buffer_t outputToken,
 153                    OM_uint32 *smFlags GSSEAP_UNUSED)
 154 {
 155     OM_uint32 major;
 156
 157     major = gssEapProcessSupportedExts(minor, inputToken,
 158                                        gssEapAcceptorExtsFlagMap,
 159                                         sizeof(gssEapAcceptorExtsFlagMap) /
 160                                        sizeof(gssEapAcceptorExtsFlagMap[0]),
 161                                        &ctx->flags);
 162     if (GSS_ERROR(major))
 163         return major;
 164
 165     major = gssEapEncodeSupportedExts(minor,
 166                                       gssEapSupportedInitiatorExts,
 167                                       sizeof(gssEapSupportedInitiatorExts) /
 168                                         sizeof(gssEapSupportedInitiatorExts[0]),
 169                                       outputToken);
 170     if (GSS_ERROR(major))
 171         return major;
 172
 173     return GSS_S_CONTINUE_NEEDED;
 174 }
 175
 176 static OM_uint32
 177 eapGssSmAcceptAcceptorName(OM_uint32 *minor,
 178                            gss_cred_id_t cred GSSEAP_UNUSED,
 179                            gss_ctx_id_t ctx,
 180                            gss_name_t target GSSEAP_UNUSED,
 181                            gss_OID mech GSSEAP_UNUSED,
 182                            OM_uint32 reqFlags GSSEAP_UNUSED,
 183                            OM_uint32 timeReq GSSEAP_UNUSED,
 184                            gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 185                            gss_buffer_t inputToken GSSEAP_UNUSED,
 186                            gss_buffer_t outputToken,
 187                            OM_uint32 *smFlags GSSEAP_UNUSED)
 188 {
 189     OM_uint32 major;
 190
 191     /* XXX TODO import and validate name from inputToken */
 192
 193     if (ctx->acceptorName != GSS_C_NO_NAME) {
 194         /* Send desired target name to acceptor */
 195         major = gssEapDisplayName(minor, ctx->acceptorName,
 196                                   outputToken, NULL);
 197         if (GSS_ERROR(major))
 198             return major;
 199     }
 200
 201     return GSS_S_CONTINUE_NEEDED;
 202 }
 203
 204 #ifdef GSSEAP_DEBUG
 205 static OM_uint32
 206 eapGssSmAcceptVendorInfo(OM_uint32 *minor,
 207                          gss_cred_id_t cred GSSEAP_UNUSED,
 208                          gss_ctx_id_t ctx GSSEAP_UNUSED,
 209                          gss_name_t target GSSEAP_UNUSED,
 210                          gss_OID mech GSSEAP_UNUSED,
 211                          OM_uint32 reqFlags GSSEAP_UNUSED,
 212                          OM_uint32 timeReq GSSEAP_UNUSED,
 213                          gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 214                          gss_buffer_t inputToken,
 215                          gss_buffer_t outputToken GSSEAP_UNUSED,
 216                          OM_uint32 *smFlags GSSEAP_UNUSED)
 217 {
 218     fprintf(stderr, "GSS-EAP: vendor: %.*s\n",
 219             (int)inputToken->length, (char *)inputToken->value);
 220
 221     *minor = 0;
 222     return GSS_S_CONTINUE_NEEDED;
 223 }
 224 #endif
 225
 226
 227 /*
 228  * Emit a identity EAP request to force the initiator (peer) to identify
 229  * itself.
 230  */
 231 static OM_uint32
 232 eapGssSmAcceptIdentity(OM_uint32 *minor,
 233                        gss_cred_id_t cred,
 234                        gss_ctx_id_t ctx,
 235                        gss_name_t target GSSEAP_UNUSED,
 236                        gss_OID mech GSSEAP_UNUSED,
 237                        OM_uint32 reqFlags GSSEAP_UNUSED,
 238                        OM_uint32 timeReq GSSEAP_UNUSED,
 239                        gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 240                        gss_buffer_t inputToken,
 241                        gss_buffer_t outputToken,
 242                        OM_uint32 *smFlags)
 243 {
 244     OM_uint32 major;
 245     struct wpabuf *reqData;
 246     gss_buffer_desc pktBuffer;
 247
 248     if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
 249         *minor = GSSEAP_CRED_MECH_MISMATCH;
 250         return GSS_S_BAD_MECH;
 251     }
 252
 253     if (inputToken != GSS_C_NO_BUFFER && inputToken->length != 0) {
 254         *minor = GSSEAP_WRONG_SIZE;
 255         return GSS_S_DEFECTIVE_TOKEN;
 256     }
 257
 258     reqData = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY, 0,
 259                             EAP_CODE_REQUEST, 0);
 260     if (reqData == NULL) {
 261         *minor = ENOMEM;
 262         return GSS_S_FAILURE;
 263     }
 264
 265     pktBuffer.length = wpabuf_len(reqData);
 266     pktBuffer.value = (void *)wpabuf_head(reqData);
 267
 268     major = duplicateBuffer(minor, &pktBuffer, outputToken);
 269     if (GSS_ERROR(major))
 270         return major;
 271
 272     wpabuf_free(reqData);
 273
 274     GSSEAP_SM_TRANSITION_NEXT(ctx);
 275
 276     *minor = 0;
 277     *smFlags |= SM_FLAG_SEND_TOKEN | SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 278
 279     return GSS_S_CONTINUE_NEEDED;
 280 }
 281
 282 /*
 283  * Returns TRUE if the input token contains an EAP identity response.
 284  */
 285 static int
 286 isIdentityResponseP(gss_buffer_t inputToken)
 287 {
 288     struct wpabuf respData;
 289
 290     wpabuf_set(&respData, inputToken->value, inputToken->length);
 291
 292     return (eap_get_type(&respData) == EAP_TYPE_IDENTITY);
 293 }
 294
 295 /*
 296  * Save the asserted initiator identity from the EAP identity response.
 297  */
 298 static OM_uint32
 299 importInitiatorIdentity(OM_uint32 *minor,
 300                         gss_ctx_id_t ctx,
 301                         gss_buffer_t inputToken)
 302 {
 303     OM_uint32 tmpMinor;
 304     struct wpabuf respData;
 305     const unsigned char *pos;
 306     size_t len;
 307     gss_buffer_desc nameBuf;
 308
 309     wpabuf_set(&respData, inputToken->value, inputToken->length);
 310
 311     pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY,
 312                            &respData, &len);
 313     if (pos == NULL) {
 314         *minor = GSSEAP_PEER_BAD_MESSAGE;
 315         return GSS_S_DEFECTIVE_TOKEN;
 316     }
 317
 318     nameBuf.value = (void *)pos;
 319     nameBuf.length = len;
 320
 321     gssEapReleaseName(&tmpMinor, &ctx->initiatorName);
 322
 323     return gssEapImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
 324                             ctx->mechanismUsed, &ctx->initiatorName);
 325 }
 326
 327 /*
 328  * Pass the asserted initiator identity to the authentication server.
 329  */
 330 static OM_uint32
 331 setInitiatorIdentity(OM_uint32 *minor,
 332                      gss_ctx_id_t ctx,
 333                      VALUE_PAIR **vps)
 334 {
 335     OM_uint32 major, tmpMinor;
 336     gss_buffer_desc nameBuf;
 337
 338     /*
 339      * We should have got an EAP identity response, but if we didn't, then
 340      * we will just avoid sending User-Name. Note that radsecproxy requires
 341      * User-Name to be sent on every request (presumably so it can remain
 342      * stateless).
 343      */
 344     if (ctx->initiatorName != GSS_C_NO_NAME) {
 345         major = gssEapDisplayName(minor, ctx->initiatorName, &nameBuf, NULL);
 346         if (GSS_ERROR(major))
 347             return major;
 348
 349         major = gssEapRadiusAddAvp(minor, vps, PW_USER_NAME, 0, &nameBuf);
 350         if (GSS_ERROR(major))
 351             return major;
 352
 353         gss_release_buffer(&tmpMinor, &nameBuf);
 354     }
 355
 356     *minor = 0;
 357     return GSS_S_COMPLETE;
 358 }
 359
 360 /*
 361  * Pass the asserted acceptor identity to the authentication server.
 362  */
 363 static OM_uint32
 364 setAcceptorIdentity(OM_uint32 *minor,
 365                     gss_ctx_id_t ctx,
 366                     VALUE_PAIR **vps)
 367 {
 368     OM_uint32 major;
 369     gss_buffer_desc nameBuf;
 370     krb5_context krbContext = NULL;
 371     krb5_principal krbPrinc;
 372     struct rs_context *rc = ctx->acceptorCtx.radContext;
 373
 374     assert(rc != NULL);
 375
 376     if (ctx->acceptorName == GSS_C_NO_NAME) {
 377         *minor = 0;
 378         return GSS_S_COMPLETE;
 379     }
 380
 381     if ((ctx->acceptorName->flags & NAME_FLAG_SERVICE) == 0) {
 382         *minor = GSSEAP_BAD_SERVICE_NAME;
 383         return GSS_S_BAD_NAME;
 384     }
 385
 386     GSSEAP_KRB_INIT(&krbContext);
 387
 388     krbPrinc = ctx->acceptorName->krbPrincipal;
 389     assert(krbPrinc != NULL);
 390     assert(KRB_PRINC_LENGTH(krbPrinc) >= 2);
 391
 392     /* Acceptor-Service-Name */
 393     krbPrincComponentToGssBuffer(krbPrinc, 0, &nameBuf);
 394
 395     major = gssEapRadiusAddAvp(minor, vps,
 396                                PW_GSS_ACCEPTOR_SERVICE_NAME,
 397                                VENDORPEC_UKERNA,
 398                                &nameBuf);
 399     if (GSS_ERROR(major))
 400         return major;
 401
 402     /* Acceptor-Host-Name */
 403     krbPrincComponentToGssBuffer(krbPrinc, 1, &nameBuf);
 404
 405     major = gssEapRadiusAddAvp(minor, vps,
 406                                PW_GSS_ACCEPTOR_HOST_NAME,
 407                                VENDORPEC_UKERNA,
 408                                &nameBuf);
 409     if (GSS_ERROR(major))
 410         return major;
 411
 412     if (KRB_PRINC_LENGTH(krbPrinc) > 2) {
 413         /* Acceptor-Service-Specific */
 414         krb5_principal_data ssiPrinc = *krbPrinc;
 415         char *ssi;
 416
 417         KRB_PRINC_LENGTH(&ssiPrinc) -= 2;
 418         KRB_PRINC_NAME(&ssiPrinc) += 2;
 419
 420         *minor = krb5_unparse_name_flags(krbContext, &ssiPrinc,
 421                                          KRB5_PRINCIPAL_UNPARSE_NO_REALM, &ssi);
 422         if (*minor != 0)
 423             return GSS_S_FAILURE;
 424
 425         nameBuf.value = ssi;
 426         nameBuf.length = strlen(ssi);
 427
 428         major = gssEapRadiusAddAvp(minor, vps,
 429                                    PW_GSS_ACCEPTOR_SERVICE_SPECIFIC,
 430                                    VENDORPEC_UKERNA,
 431                                    &nameBuf);
 432
 433         if (GSS_ERROR(major)) {
 434             krb5_free_unparsed_name(krbContext, ssi);
 435             return major;
 436         }
 437         krb5_free_unparsed_name(krbContext, ssi);
 438     }
 439
 440     krbPrincRealmToGssBuffer(krbPrinc, &nameBuf);
 441     if (nameBuf.length != 0) {
 442         /* Acceptor-Realm-Name */
 443         major = gssEapRadiusAddAvp(minor, vps,
 444                                    PW_GSS_ACCEPTOR_REALM_NAME,
 445                                    VENDORPEC_UKERNA,
 446                                    &nameBuf);
 447         if (GSS_ERROR(major))
 448             return major;
 449     }
 450
 451     *minor = 0;
 452     return GSS_S_COMPLETE;
 453 }
 454
 455 /*
 456  * Allocate a RadSec handle
 457  */
 458 static OM_uint32
 459 createRadiusHandle(OM_uint32 *minor,
 460                    gss_cred_id_t cred,
 461                    gss_ctx_id_t ctx)
 462 {
 463     struct gss_eap_acceptor_ctx *actx = &ctx->acceptorCtx;
 464     const char *configFile = RS_CONFIG_FILE;
 465     const char *configStanza = "gss-eap";
 466     struct rs_alloc_scheme ralloc;
 467     struct rs_error *err;
 468
 469     assert(actx->radContext == NULL);
 470     assert(actx->radConn == NULL);
 471
 472     if (rs_context_create(&actx->radContext) != 0) {
 473         *minor = GSSEAP_RADSEC_CONTEXT_FAILURE;
 474         return GSS_S_FAILURE;
 475     }
 476
 477     if (cred->radiusConfigFile != NULL)
 478         configFile = cred->radiusConfigFile;
 479     if (cred->radiusConfigStanza != NULL)
 480         configStanza = cred->radiusConfigStanza;
 481
 482     ralloc.calloc  = GSSEAP_CALLOC;
 483     ralloc.malloc  = GSSEAP_MALLOC;
 484     ralloc.free    = GSSEAP_FREE;
 485     ralloc.realloc = GSSEAP_REALLOC;
 486
 487     rs_context_set_alloc_scheme(actx->radContext, &ralloc);
 488
 489     if (rs_context_read_config(actx->radContext, configFile) != 0) {
 490         err = rs_err_ctx_pop(actx->radContext);
 491         goto fail;
 492     }
 493
 494     if (rs_context_init_freeradius_dict(actx->radContext, NULL) != 0) {
 495         err = rs_err_ctx_pop(actx->radContext);
 496         goto fail;
 497     }
 498
 499     if (rs_conn_create(actx->radContext, &actx->radConn, configStanza) != 0) {
 500         err = rs_err_conn_pop(actx->radConn);
 501         goto fail;
 502     }
 503
 504     if (actx->radServer != NULL) {
 505         if (rs_conn_select_peer(actx->radConn, actx->radServer) != 0) {
 506             err = rs_err_conn_pop(actx->radConn);
 507             goto fail;
 508         }
 509     }
 510
 511     *minor = 0;
 512     return GSS_S_COMPLETE;
 513
 514 fail:
 515     return gssEapRadiusMapError(minor, err);
 516 }
 517
 518 /*
 519  * Process a EAP response from the initiator.
 520  */
 521 static OM_uint32
 522 eapGssSmAcceptAuthenticate(OM_uint32 *minor,
 523                            gss_cred_id_t cred,
 524                            gss_ctx_id_t ctx,
 525                            gss_name_t target GSSEAP_UNUSED,
 526                            gss_OID mech GSSEAP_UNUSED,
 527                            OM_uint32 reqFlags GSSEAP_UNUSED,
 528                            OM_uint32 timeReq GSSEAP_UNUSED,
 529                            gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 530                            gss_buffer_t inputToken,
 531                            gss_buffer_t outputToken,
 532                            OM_uint32 *smFlags)
 533 {
 534     OM_uint32 major, tmpMinor;
 535     struct rs_connection *rconn;
 536     struct rs_request *request = NULL;
 537     struct rs_packet *req = NULL, *resp = NULL;
 538     struct radius_packet *frreq, *frresp;
 539
 540     if (ctx->acceptorCtx.radContext == NULL) {
 541         /* May be NULL from an imported partial context */
 542         major = createRadiusHandle(minor, cred, ctx);
 543         if (GSS_ERROR(major))
 544             goto cleanup;
 545     }
 546
 547     if (isIdentityResponseP(inputToken)) {
 548         major = importInitiatorIdentity(minor, ctx, inputToken);
 549         if (GSS_ERROR(major))
 550             return major;
 551     }
 552
 553     rconn = ctx->acceptorCtx.radConn;
 554
 555     if (rs_packet_create_authn_request(rconn, &req, NULL, NULL) != 0) {
 556         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 557         goto cleanup;
 558     }
 559     frreq = rs_packet_frpkt(req);
 560
 561     major = setInitiatorIdentity(minor, ctx, &frreq->vps);
 562     if (GSS_ERROR(major))
 563         goto cleanup;
 564
 565     major = setAcceptorIdentity(minor, ctx, &frreq->vps);
 566     if (GSS_ERROR(major))
 567         goto cleanup;
 568
 569     major = gssEapRadiusAddAvp(minor, &frreq->vps,
 570                                PW_EAP_MESSAGE, 0, inputToken);
 571     if (GSS_ERROR(major))
 572         goto cleanup;
 573
 574     if (ctx->acceptorCtx.state.length != 0) {
 575         major = gssEapRadiusAddAvp(minor, &frreq->vps, PW_STATE, 0,
 576                                    &ctx->acceptorCtx.state);
 577         if (GSS_ERROR(major))
 578             goto cleanup;
 579
 580         gss_release_buffer(&tmpMinor, &ctx->acceptorCtx.state);
 581     }
 582
 583     if (rs_request_create(rconn, &request) != 0) {
 584         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 585         goto cleanup;
 586     }
 587
 588     rs_request_add_reqpkt(request, req);
 589     req = NULL;
 590
 591     if (rs_request_send(request, &resp) != 0) {
 592         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 593         goto cleanup;
 594     }
 595
 596     assert(resp != NULL);
 597
 598     frresp = rs_packet_frpkt(resp);
 599     switch (frresp->code) {
 600     case PW_ACCESS_CHALLENGE:
 601     case PW_AUTHENTICATION_ACK:
 602         break;
 603     case PW_AUTHENTICATION_REJECT:
 604         *minor = GSSEAP_RADIUS_AUTH_FAILURE;
 605         major = GSS_S_DEFECTIVE_CREDENTIAL;
 606         goto cleanup;
 607         break;
 608     default:
 609         *minor = GSSEAP_UNKNOWN_RADIUS_CODE;
 610         major = GSS_S_FAILURE;
 611         goto cleanup;
 612         break;
 613     }
 614
 615     major = gssEapRadiusGetAvp(minor, frresp->vps, PW_EAP_MESSAGE, 0,
 616                                outputToken, TRUE);
 617     if (major == GSS_S_UNAVAILABLE && frresp->code == PW_ACCESS_CHALLENGE) {
 618         *minor = GSSEAP_MISSING_EAP_REQUEST;
 619         major = GSS_S_DEFECTIVE_TOKEN;
 620         goto cleanup;
 621     } else if (GSS_ERROR(major))
 622         goto cleanup;
 623
 624     if (frresp->code == PW_ACCESS_CHALLENGE) {
 625         major = gssEapRadiusGetAvp(minor, frresp->vps, PW_STATE, 0,
 626                                    &ctx->acceptorCtx.state, TRUE);
 627         if (GSS_ERROR(major) && *minor != GSSEAP_NO_SUCH_ATTR)
 628             goto cleanup;
 629     } else {
 630         ctx->acceptorCtx.vps = frresp->vps;
 631         frresp->vps = NULL;
 632
 633         major = acceptReadyEap(minor, ctx, cred);
 634         if (GSS_ERROR(major))
 635             goto cleanup;
 636
 637         GSSEAP_SM_TRANSITION_NEXT(ctx);
 638     }
 639
 640     major = GSS_S_CONTINUE_NEEDED;
 641     *minor = 0;
 642     *smFlags |= SM_FLAG_SEND_TOKEN | SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 643
 644 cleanup:
 645     if (request != NULL)
 646         rs_request_destroy(request);
 647     if (req != NULL)
 648         rs_packet_destroy(req);
 649     if (resp != NULL)
 650         rs_packet_destroy(resp);
 651     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIATOR_EXTS) {
 652         assert(major == GSS_S_CONTINUE_NEEDED);
 653
 654         rs_conn_destroy(ctx->acceptorCtx.radConn);
 655         ctx->acceptorCtx.radConn = NULL;
 656     }
 657
 658     return major;
 659 }
 660
 661 static OM_uint32
 662 eapGssSmAcceptGssFlags(OM_uint32 *minor,
 663                        gss_cred_id_t cred GSSEAP_UNUSED,
 664                        gss_ctx_id_t ctx,
 665                        gss_name_t target GSSEAP_UNUSED,
 666                        gss_OID mech GSSEAP_UNUSED,
 667                        OM_uint32 reqFlags GSSEAP_UNUSED,
 668                        OM_uint32 timeReq GSSEAP_UNUSED,
 669                        gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 670                        gss_buffer_t inputToken,
 671                        gss_buffer_t outputToken GSSEAP_UNUSED,
 672                        OM_uint32 *smFlags GSSEAP_UNUSED)
 673 {
 674     unsigned char *p;
 675     OM_uint32 initiatorGssFlags;
 676
 677     assert((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0);
 678
 679     if (inputToken->length < 4) {
 680         *minor = GSSEAP_TOK_TRUNC;
 681         return GSS_S_DEFECTIVE_TOKEN;
 682     }
 683
 684     /* allow flags to grow for future expansion */
 685     p = (unsigned char *)inputToken->value + inputToken->length - 4;
 686
 687     initiatorGssFlags = load_uint32_be(p);
 688     initiatorGssFlags &= GSSEAP_WIRE_FLAGS_MASK;
 689
 690     ctx->gssFlags |= initiatorGssFlags;
 691
 692     return GSS_S_CONTINUE_NEEDED;
 693 }
 694
 695 static OM_uint32
 696 eapGssSmAcceptGssChannelBindings(OM_uint32 *minor,
 697                                  gss_cred_id_t cred GSSEAP_UNUSED,
 698                                  gss_ctx_id_t ctx,
 699                                  gss_name_t target GSSEAP_UNUSED,
 700                                  gss_OID mech GSSEAP_UNUSED,
 701                                  OM_uint32 reqFlags GSSEAP_UNUSED,
 702                                  OM_uint32 timeReq GSSEAP_UNUSED,
 703                                  gss_channel_bindings_t chanBindings,
 704                                  gss_buffer_t inputToken,
 705                                  gss_buffer_t outputToken GSSEAP_UNUSED,
 706                                  OM_uint32 *smFlags GSSEAP_UNUSED)
 707 {
 708     OM_uint32 major, tmpMinor;
 709     gss_iov_buffer_desc iov[2];
 710
 711     assert((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0);
 712
 713     iov[0].type = GSS_IOV_BUFFER_TYPE_DATA | GSS_IOV_BUFFER_FLAG_ALLOCATE;
 714     iov[0].buffer.length = 0;
 715     iov[0].buffer.value = NULL;
 716
 717     iov[1].type = GSS_IOV_BUFFER_TYPE_STREAM;
 718     iov[1].buffer = *inputToken;
 719
 720     major = gssEapUnwrapOrVerifyMIC(minor, ctx, NULL, NULL,
 721                                     iov, 2, TOK_TYPE_WRAP);
 722     if (GSS_ERROR(major))
 723         return major;
 724
 725     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS &&
 726         !bufferEqual(&iov[0].buffer, &chanBindings->application_data)) {
 727         major = GSS_S_BAD_BINDINGS;
 728         *minor = GSSEAP_BINDINGS_MISMATCH;
 729     } else {
 730         major = GSS_S_CONTINUE_NEEDED;
 731         *minor = 0;
 732     }
 733
 734     gss_release_buffer(&tmpMinor, &iov[0].buffer);
 735
 736     return major;
 737 }
 738
 739 #ifdef GSSEAP_ENABLE_REAUTH
 740 static OM_uint32
 741 eapGssSmAcceptReauthCreds(OM_uint32 *minor,
 742                           gss_cred_id_t cred,
 743                           gss_ctx_id_t ctx,
 744                           gss_name_t target GSSEAP_UNUSED,
 745                           gss_OID mech GSSEAP_UNUSED,
 746                           OM_uint32 reqFlags GSSEAP_UNUSED,
 747                           OM_uint32 timeReq GSSEAP_UNUSED,
 748                           gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 749                           gss_buffer_t inputToken GSSEAP_UNUSED,
 750                           gss_buffer_t outputToken,
 751                           OM_uint32 *smFlags GSSEAP_UNUSED)
 752 {
 753     OM_uint32 major;
 754
 755     /*
 756      * If we're built with fast reauthentication enabled, then
 757      * fabricate a ticket from the initiator to ourselves.
 758      */
 759     if (ctx->flags & CTX_FLAG_KRB_REAUTH_SUPPORTED)
 760         major = gssEapMakeReauthCreds(minor, ctx, cred, outputToken);
 761     else
 762         major = GSS_S_UNAVAILABLE;
 763
 764     if (major == GSS_S_UNAVAILABLE)
 765         major = GSS_S_COMPLETE;
 766
 767     return GSS_ERROR(major) ? major : GSS_S_CONTINUE_NEEDED;
 768 }
 769 #endif
 770
 771 static OM_uint32
 772 eapGssSmAcceptInitiatorMIC(OM_uint32 *minor,
 773                            gss_cred_id_t cred GSSEAP_UNUSED,
 774                            gss_ctx_id_t ctx,
 775                            gss_name_t target GSSEAP_UNUSED,
 776                            gss_OID mech GSSEAP_UNUSED,
 777                            OM_uint32 reqFlags GSSEAP_UNUSED,
 778                            OM_uint32 timeReq GSSEAP_UNUSED,
 779                            gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 780                            gss_buffer_t inputToken,
 781                            gss_buffer_t outputToken GSSEAP_UNUSED,
 782                            OM_uint32 *smFlags GSSEAP_UNUSED)
 783 {
 784     OM_uint32 major;
 785
 786     assert((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0);
 787
 788     major = gssEapVerifyConversationMIC(minor, ctx, inputToken);
 789     if (GSS_ERROR(major))
 790         return major;
 791
 792     GSSEAP_SM_TRANSITION_NEXT(ctx);
 793
 794     *minor = 0;
 795
 796     return GSS_S_CONTINUE_NEEDED;
 797 }
 798
 799 static OM_uint32
 800 eapGssSmAcceptAcceptorMIC(OM_uint32 *minor,
 801                           gss_cred_id_t cred GSSEAP_UNUSED,
 802                           gss_ctx_id_t ctx,
 803                           gss_name_t target GSSEAP_UNUSED,
 804                           gss_OID mech GSSEAP_UNUSED,
 805                           OM_uint32 reqFlags GSSEAP_UNUSED,
 806                           OM_uint32 timeReq GSSEAP_UNUSED,
 807                           gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 808                           gss_buffer_t inputToken GSSEAP_UNUSED,
 809                           gss_buffer_t outputToken,
 810                           OM_uint32 *smFlags)
 811 {
 812     OM_uint32 major;
 813
 814     major = gssEapGetConversationMIC(minor, ctx, outputToken);
 815     if (GSS_ERROR(major))
 816         return major;
 817
 818     GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 819
 820     *minor = 0;
 821     *smFlags |= SM_FLAG_SEND_TOKEN | SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 822
 823     return GSS_S_COMPLETE;
 824 }
 825
 826 /*
 827  * Acceptor state machine.
 828  */
 829 static struct gss_eap_sm eapGssAcceptorSm[] = {
 830 #ifdef GSSEAP_ENABLE_REAUTH
 831     {
 832         ITOK_TYPE_REAUTH_REQ,
 833         ITOK_TYPE_REAUTH_RESP,
 834         GSSEAP_STATE_INITIAL | GSSEAP_STATE_REAUTHENTICATE,
 835         0,
 836         eapGssSmAcceptGssReauth,
 837     },
 838 #endif
 839     {
 840         ITOK_TYPE_ACCEPTOR_NAME_REQ,
 841         ITOK_TYPE_ACCEPTOR_NAME_RESP,
 842         GSSEAP_STATE_INITIAL,
 843         0,
 844         eapGssSmAcceptAcceptorName
 845     },
 846     {
 847         ITOK_TYPE_SUPPORTED_ACCEPTOR_EXTS,
 848         ITOK_TYPE_SUPPORTED_INITIATOR_EXTS,
 849         GSSEAP_STATE_INITIAL,
 850         0,
 851         eapGssSmAcceptExts,
 852     },
 853 #ifdef GSSEAP_DEBUG
 854     {
 855         ITOK_TYPE_VENDOR_INFO,
 856         ITOK_TYPE_NONE,
 857         GSSEAP_STATE_INITIAL,
 858         0,
 859         eapGssSmAcceptVendorInfo,
 860     },
 861 #endif
 862     {
 863         ITOK_TYPE_NONE,
 864         ITOK_TYPE_EAP_REQ,
 865         GSSEAP_STATE_INITIAL,
 866         SM_ITOK_FLAG_REQUIRED,
 867         eapGssSmAcceptIdentity,
 868     },
 869     {
 870         ITOK_TYPE_EAP_RESP,
 871         ITOK_TYPE_EAP_REQ,
 872         GSSEAP_STATE_AUTHENTICATE,
 873         SM_ITOK_FLAG_REQUIRED,
 874         eapGssSmAcceptAuthenticate
 875     },
 876     {
 877         ITOK_TYPE_GSS_FLAGS,
 878         ITOK_TYPE_NONE,
 879         GSSEAP_STATE_INITIATOR_EXTS,
 880         0,
 881         eapGssSmAcceptGssFlags
 882     },
 883     {
 884         ITOK_TYPE_GSS_CHANNEL_BINDINGS,
 885         ITOK_TYPE_NONE,
 886         GSSEAP_STATE_INITIATOR_EXTS,
 887         0,
 888         eapGssSmAcceptGssChannelBindings,
 889     },
 890     {
 891         ITOK_TYPE_INITIATOR_MIC,
 892         ITOK_TYPE_NONE,
 893         GSSEAP_STATE_INITIATOR_EXTS,
 894         SM_ITOK_FLAG_REQUIRED,
 895         eapGssSmAcceptInitiatorMIC,
 896     },
 897 #ifdef GSSEAP_ENABLE_REAUTH
 898     {
 899         ITOK_TYPE_NONE,
 900         ITOK_TYPE_REAUTH_CREDS,
 901         GSSEAP_STATE_ACCEPTOR_EXTS,
 902         0,
 903         eapGssSmAcceptReauthCreds,
 904     },
 905 #endif
 906     {
 907         ITOK_TYPE_NONE,
 908         ITOK_TYPE_ACCEPTOR_MIC,
 909         GSSEAP_STATE_ACCEPTOR_EXTS,
 910         0,
 911         eapGssSmAcceptAcceptorMIC
 912     },
 913 };
 914
 915 OM_uint32
 916 gss_accept_sec_context(OM_uint32 *minor,
 917                        gss_ctx_id_t *context_handle,
 918                        gss_cred_id_t cred,
 919                        gss_buffer_t input_token,
 920                        gss_channel_bindings_t input_chan_bindings,
 921                        gss_name_t *src_name,
 922                        gss_OID *mech_type,
 923                        gss_buffer_t output_token,
 924                        OM_uint32 *ret_flags,
 925                        OM_uint32 *time_rec,
 926                        gss_cred_id_t *delegated_cred_handle)
 927 {
 928     OM_uint32 major, tmpMinor;
 929     gss_ctx_id_t ctx = *context_handle;
 930
 931     *minor = 0;
 932
 933     output_token->length = 0;
 934     output_token->value = NULL;
 935
 936     if (src_name != NULL)
 937         *src_name = GSS_C_NO_NAME;
 938
 939     if (input_token == GSS_C_NO_BUFFER || input_token->length == 0) {
 940         *minor = GSSEAP_TOK_TRUNC;
 941         return GSS_S_DEFECTIVE_TOKEN;
 942     }
 943
 944     if (ctx == GSS_C_NO_CONTEXT) {
 945         major = gssEapAllocContext(minor, &ctx);
 946         if (GSS_ERROR(major))
 947             return major;
 948
 949         *context_handle = ctx;
 950     }
 951
 952     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 953
 954     if (cred == GSS_C_NO_CREDENTIAL) {
 955         if (ctx->defaultCred == GSS_C_NO_CREDENTIAL) {
 956             major = gssEapAcquireCred(minor,
 957                                       GSS_C_NO_NAME,
 958                                       GSS_C_NO_BUFFER,
 959                                       GSS_C_INDEFINITE,
 960                                       GSS_C_NO_OID_SET,
 961                                       GSS_C_ACCEPT,
 962                                       &ctx->defaultCred,
 963                                       NULL,
 964                                       NULL);
 965             if (GSS_ERROR(major))
 966                 goto cleanup;
 967         }
 968
 969         cred = ctx->defaultCred;
 970     }
 971
 972     GSSEAP_MUTEX_LOCK(&cred->mutex);
 973
 974     if (cred->name != GSS_C_NO_NAME) {
 975         major = gssEapDuplicateName(minor, cred->name, &ctx->acceptorName);
 976         if (GSS_ERROR(major))
 977             goto cleanup;
 978     }
 979
 980     major = gssEapSmStep(minor,
 981                          cred,
 982                          ctx,
 983                          GSS_C_NO_NAME,
 984                          GSS_C_NO_OID,
 985                          0,
 986                          GSS_C_INDEFINITE,
 987                          input_chan_bindings,
 988                          input_token,
 989                          output_token,
 990                          eapGssAcceptorSm,
 991                          sizeof(eapGssAcceptorSm) / sizeof(eapGssAcceptorSm[0]));
 992     if (GSS_ERROR(major))
 993         goto cleanup;
 994
 995     if (mech_type != NULL) {
 996         OM_uint32 tmpMajor;
 997
 998         tmpMajor = gssEapCanonicalizeOid(&tmpMinor, ctx->mechanismUsed, 0, mech_type);
 999         if (GSS_ERROR(tmpMajor)) {
1000             major = tmpMajor;
1001             *minor = tmpMinor;
1002             goto cleanup;
1003         }
1004     }
1005     if (ret_flags != NULL)
1006         *ret_flags = ctx->gssFlags;
1007     if (delegated_cred_handle != NULL)
1008         *delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1009
1010     if (major == GSS_S_COMPLETE) {
1011         if (src_name != NULL && ctx->initiatorName != GSS_C_NO_NAME) {
1012             major = gssEapDuplicateName(&tmpMinor, ctx->initiatorName, src_name);
1013             if (GSS_ERROR(major))
1014                 goto cleanup;
1015         }
1016         if (time_rec != NULL) {
1017             major = gssEapContextTime(&tmpMinor, ctx, time_rec);
1018             if (GSS_ERROR(major))
1019                 goto cleanup;
1020         }
1021     }
1022
1023     assert(CTX_IS_ESTABLISHED(ctx) || major == GSS_S_CONTINUE_NEEDED);
1024
1025 cleanup:
1026     if (cred != GSS_C_NO_CREDENTIAL)
1027         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
1028     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
1029
1030     if (GSS_ERROR(major))
1031         gssEapReleaseContext(&tmpMinor, context_handle);
1032
1033     return major;
1034 }
1035
1036 #ifdef GSSEAP_ENABLE_REAUTH
1037 static OM_uint32
1038 acceptReadyKrb(OM_uint32 *minor,
1039                gss_ctx_id_t ctx,
1040                gss_cred_id_t cred,
1041                const gss_name_t initiator,
1042                const gss_OID mech,
1043                OM_uint32 timeRec)
1044 {
1045     OM_uint32 major;
1046
1047     major = gssEapGlueToMechName(minor, ctx, initiator, &ctx->initiatorName);
1048     if (GSS_ERROR(major))
1049         return major;
1050
1051     major = gssEapReauthComplete(minor, ctx, cred, mech, timeRec);
1052     if (GSS_ERROR(major))
1053         return major;
1054
1055     *minor = 0;
1056     return GSS_S_COMPLETE;
1057 }
1058
1059 static OM_uint32
1060 eapGssSmAcceptGssReauth(OM_uint32 *minor,
1061                         gss_cred_id_t cred,
1062                         gss_ctx_id_t ctx,
1063                         gss_name_t target GSSEAP_UNUSED,
1064                         gss_OID mech,
1065                         OM_uint32 reqFlags GSSEAP_UNUSED,
1066                         OM_uint32 timeReq GSSEAP_UNUSED,
1067                         gss_channel_bindings_t userChanBindings,
1068                         gss_buffer_t inputToken,
1069                         gss_buffer_t outputToken,
1070                         OM_uint32 *smFlags)
1071 {
1072     OM_uint32 major, tmpMinor;
1073     gss_name_t krbInitiator = GSS_C_NO_NAME;
1074     OM_uint32 gssFlags, timeRec = GSS_C_INDEFINITE;
1075     struct gss_channel_bindings_struct wireChanBindings = { 0 };
1076
1077     /*
1078      * If we're built with fast reauthentication support, it's valid
1079      * for an initiator to send a GSS reauthentication token as its
1080      * initial context token, causing us to short-circuit the state
1081      * machine and process Kerberos GSS messages instead.
1082      */
1083
1084     ctx->flags |= CTX_FLAG_KRB_REAUTH;
1085
1086     /*
1087      * To avoid an additional round trip, we use GSS channel bindings
1088      * to integrity protect the rest of the initiator exchange. This
1089      * does have the disadvantage of making it impossible for the
1090      * acceptor to ignore application channel bindings, behaviour
1091      * which differs from normal Kerberos and GSS-EAP itself.
1092      */
1093     major = gssEapMakeTokenChannelBindings(minor, ctx,
1094                                            userChanBindings,
1095                                            inputToken,
1096                                            &wireChanBindings);
1097     if (GSS_ERROR(major))
1098         return major;
1099
1100     major = gssAcceptSecContext(minor,
1101                                 &ctx->kerberosCtx,
1102                                 cred->krbCred,
1103                                 inputToken,
1104                                 &wireChanBindings,
1105                                 &krbInitiator,
1106                                 &mech,
1107                                 outputToken,
1108                                 &gssFlags,
1109                                 &timeRec,
1110                                 NULL);
1111     if (major == GSS_S_COMPLETE) {
1112         major = acceptReadyKrb(minor, ctx, cred,
1113                                krbInitiator, mech, timeRec);
1114         if (major == GSS_S_COMPLETE) {
1115             /* Generate acceptor MIC */
1116             GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ACCEPTOR_EXTS);
1117         }
1118         ctx->gssFlags = gssFlags;
1119     } else if (GSS_ERROR(major) &&
1120         (*smFlags & SM_FLAG_INPUT_TOKEN_CRITICAL) == 0) {
1121         /* Fall back to EAP */
1122         gssDeleteSecContext(&tmpMinor, &ctx->kerberosCtx, GSS_C_NO_BUFFER);
1123         ctx->flags &= ~(CTX_FLAG_KRB_REAUTH);
1124         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_INITIAL);
1125     } else {
1126         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_REAUTHENTICATE);
1127     }
1128
1129     major = GSS_S_CONTINUE_NEEDED;
1130
1131     gssReleaseName(&tmpMinor, &krbInitiator);
1132     gss_release_buffer(&tmpMinor, &wireChanBindings.application_data);
1133
1134     return major;
1135 }
1136 #endif /* GSSEAP_ENABLE_REAUTH */