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