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     rs_const_avp *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 && rs_avp_length(vp) != 0) {
  76         rs_avp_octets_value_byref((rs_avp *)vp,
  77                                   (unsigned char **)&nameBuf.value,
  78                                   &nameBuf.length);
  79     } else {
  80         ctx->gssFlags |= GSS_C_ANON_FLAG;
  81     }
  82
  83     major = gssEapImportName(minor, &nameBuf,
  84                              (ctx->gssFlags & GSS_C_ANON_FLAG) ?
  85                                 GSS_C_NT_ANONYMOUS : GSS_C_NT_USER_NAME,
  86                              ctx->mechanismUsed,
  87                              &ctx->initiatorName);
  88     if (GSS_ERROR(major))
  89         return major;
  90
  91     major = gssEapRadiusGetRawAvp(minor, ctx->acceptorCtx.vps,
  92                                   PW_MS_MPPE_SEND_KEY, VENDORPEC_MICROSOFT, &vp);
  93     if (GSS_ERROR(major)) {
  94         *minor = GSSEAP_KEY_UNAVAILABLE;
  95         return GSS_S_UNAVAILABLE;
  96     }
  97
  98     major = gssEapDeriveRfc3961Key(minor,
  99                                    rs_avp_octets_value_const_ptr(vp),
 100                                    rs_avp_length(vp),
 101                                    ctx->encryptionType,
 102                                    &ctx->rfc3961Key);
 103     if (GSS_ERROR(major))
 104         return major;
 105
 106     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 107                                        &ctx->checksumType);
 108     if (GSS_ERROR(major))
 109         return major;
 110
 111     major = sequenceInit(minor,
 112                          &ctx->seqState, ctx->recvSeq,
 113                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 114                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 115                          TRUE);
 116     if (GSS_ERROR(major))
 117         return major;
 118
 119     major = gssEapCreateAttrContext(minor, cred, ctx,
 120                                     &ctx->initiatorName->attrCtx,
 121                                     &ctx->expiryTime);
 122     if (GSS_ERROR(major))
 123         return major;
 124
 125     if (ctx->expiryTime != 0 && ctx->expiryTime < time(NULL)) {
 126         *minor = GSSEAP_CRED_EXPIRED;
 127         return GSS_S_CREDENTIALS_EXPIRED;
 128     }
 129
 130     *minor = 0;
 131     return GSS_S_COMPLETE;
 132 }
 133
 134 static OM_uint32
 135 eapGssSmAcceptAcceptorName(OM_uint32 *minor,
 136                            gss_cred_id_t cred GSSEAP_UNUSED,
 137                            gss_ctx_id_t ctx,
 138                            gss_name_t target GSSEAP_UNUSED,
 139                            gss_OID mech GSSEAP_UNUSED,
 140                            OM_uint32 reqFlags GSSEAP_UNUSED,
 141                            OM_uint32 timeReq GSSEAP_UNUSED,
 142                            gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 143                            gss_buffer_t inputToken GSSEAP_UNUSED,
 144                            gss_buffer_t outputToken,
 145                            OM_uint32 *smFlags GSSEAP_UNUSED)
 146 {
 147     OM_uint32 major;
 148
 149     /* XXX TODO import and validate name from inputToken */
 150
 151     if (ctx->acceptorName != GSS_C_NO_NAME) {
 152         /* Send desired target name to acceptor */
 153         major = gssEapDisplayName(minor, ctx->acceptorName,
 154                                   outputToken, NULL);
 155         if (GSS_ERROR(major))
 156             return major;
 157     }
 158
 159     return GSS_S_CONTINUE_NEEDED;
 160 }
 161
 162 #ifdef GSSEAP_DEBUG
 163 static OM_uint32
 164 eapGssSmAcceptVendorInfo(OM_uint32 *minor,
 165                          gss_cred_id_t cred GSSEAP_UNUSED,
 166                          gss_ctx_id_t ctx GSSEAP_UNUSED,
 167                          gss_name_t target GSSEAP_UNUSED,
 168                          gss_OID mech GSSEAP_UNUSED,
 169                          OM_uint32 reqFlags GSSEAP_UNUSED,
 170                          OM_uint32 timeReq GSSEAP_UNUSED,
 171                          gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 172                          gss_buffer_t inputToken,
 173                          gss_buffer_t outputToken GSSEAP_UNUSED,
 174                          OM_uint32 *smFlags GSSEAP_UNUSED)
 175 {
 176     fprintf(stderr, "GSS-EAP: vendor: %.*s\n",
 177             (int)inputToken->length, (char *)inputToken->value);
 178
 179     *minor = 0;
 180     return GSS_S_CONTINUE_NEEDED;
 181 }
 182 #endif
 183
 184
 185 /*
 186  * Emit a identity EAP request to force the initiator (peer) to identify
 187  * itself.
 188  */
 189 static OM_uint32
 190 eapGssSmAcceptIdentity(OM_uint32 *minor,
 191                        gss_cred_id_t cred,
 192                        gss_ctx_id_t ctx,
 193                        gss_name_t target GSSEAP_UNUSED,
 194                        gss_OID mech GSSEAP_UNUSED,
 195                        OM_uint32 reqFlags GSSEAP_UNUSED,
 196                        OM_uint32 timeReq GSSEAP_UNUSED,
 197                        gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 198                        gss_buffer_t inputToken,
 199                        gss_buffer_t outputToken,
 200                        OM_uint32 *smFlags)
 201 {
 202     OM_uint32 major;
 203     struct wpabuf *reqData;
 204     gss_buffer_desc pktBuffer;
 205
 206     if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
 207         *minor = GSSEAP_CRED_MECH_MISMATCH;
 208         return GSS_S_BAD_MECH;
 209     }
 210
 211     if (inputToken != GSS_C_NO_BUFFER && inputToken->length != 0) {
 212         *minor = GSSEAP_WRONG_SIZE;
 213         return GSS_S_DEFECTIVE_TOKEN;
 214     }
 215
 216     reqData = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY, 0,
 217                             EAP_CODE_REQUEST, 0);
 218     if (reqData == NULL) {
 219         *minor = ENOMEM;
 220         return GSS_S_FAILURE;
 221     }
 222
 223     pktBuffer.length = wpabuf_len(reqData);
 224     pktBuffer.value = (void *)wpabuf_head(reqData);
 225
 226     major = duplicateBuffer(minor, &pktBuffer, outputToken);
 227     if (GSS_ERROR(major))
 228         return major;
 229
 230     wpabuf_free(reqData);
 231
 232     GSSEAP_SM_TRANSITION_NEXT(ctx);
 233
 234     *minor = 0;
 235     *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 236
 237     return GSS_S_CONTINUE_NEEDED;
 238 }
 239
 240 /*
 241  * Returns TRUE if the input token contains an EAP identity response.
 242  */
 243 static int
 244 isIdentityResponseP(gss_buffer_t inputToken)
 245 {
 246     struct wpabuf respData;
 247
 248     wpabuf_set(&respData, inputToken->value, inputToken->length);
 249
 250     return (eap_get_type(&respData) == EAP_TYPE_IDENTITY);
 251 }
 252
 253 /*
 254  * Save the asserted initiator identity from the EAP identity response.
 255  */
 256 static OM_uint32
 257 importInitiatorIdentity(OM_uint32 *minor,
 258                         gss_ctx_id_t ctx,
 259                         gss_buffer_t inputToken)
 260 {
 261     OM_uint32 tmpMinor;
 262     struct wpabuf respData;
 263     const unsigned char *pos;
 264     size_t len;
 265     gss_buffer_desc nameBuf;
 266
 267     wpabuf_set(&respData, inputToken->value, inputToken->length);
 268
 269     pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY,
 270                            &respData, &len);
 271     if (pos == NULL) {
 272         *minor = GSSEAP_PEER_BAD_MESSAGE;
 273         return GSS_S_DEFECTIVE_TOKEN;
 274     }
 275
 276     nameBuf.value = (void *)pos;
 277     nameBuf.length = len;
 278
 279     gssEapReleaseName(&tmpMinor, &ctx->initiatorName);
 280
 281     return gssEapImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
 282                             ctx->mechanismUsed, &ctx->initiatorName);
 283 }
 284
 285 /*
 286  * Pass the asserted initiator identity to the authentication server.
 287  */
 288 static OM_uint32
 289 setInitiatorIdentity(OM_uint32 *minor,
 290                      gss_ctx_id_t ctx,
 291                      struct rs_packet *req)
 292 {
 293     OM_uint32 major, tmpMinor;
 294     gss_buffer_desc nameBuf;
 295
 296     /*
 297      * We should have got an EAP identity response, but if we didn't, then
 298      * we will just avoid sending User-Name. Note that radsecproxy requires
 299      * User-Name to be sent on every request (presumably so it can remain
 300      * stateless).
 301      */
 302     if (ctx->initiatorName != GSS_C_NO_NAME) {
 303         major = gssEapDisplayName(minor, ctx->initiatorName, &nameBuf, NULL);
 304         if (GSS_ERROR(major))
 305             return major;
 306
 307         major = gssEapRadiusAddAvp(minor, req, PW_USER_NAME, 0, &nameBuf);
 308         if (GSS_ERROR(major))
 309             return major;
 310
 311         gss_release_buffer(&tmpMinor, &nameBuf);
 312     }
 313
 314     *minor = 0;
 315     return GSS_S_COMPLETE;
 316 }
 317
 318 /*
 319  * Pass the asserted acceptor identity to the authentication server.
 320  */
 321 static OM_uint32
 322 setAcceptorIdentity(OM_uint32 *minor,
 323                     gss_ctx_id_t ctx,
 324                     struct rs_packet *req)
 325 {
 326     OM_uint32 major;
 327     gss_buffer_desc nameBuf;
 328     krb5_context krbContext = NULL;
 329     krb5_principal krbPrinc;
 330     struct rs_context *rc = ctx->acceptorCtx.radContext;
 331
 332     GSSEAP_ASSERT(rc != NULL);
 333
 334     if (ctx->acceptorName == GSS_C_NO_NAME) {
 335         *minor = 0;
 336         return GSS_S_COMPLETE;
 337     }
 338
 339     if ((ctx->acceptorName->flags & NAME_FLAG_SERVICE) == 0) {
 340         *minor = GSSEAP_BAD_SERVICE_NAME;
 341         return GSS_S_BAD_NAME;
 342     }
 343
 344     GSSEAP_KRB_INIT(&krbContext);
 345
 346     krbPrinc = ctx->acceptorName->krbPrincipal;
 347     GSSEAP_ASSERT(krbPrinc != NULL);
 348     GSSEAP_ASSERT(KRB_PRINC_LENGTH(krbPrinc) >= 2);
 349
 350     /* Acceptor-Service-Name */
 351     krbPrincComponentToGssBuffer(krbPrinc, 0, &nameBuf);
 352
 353     major = gssEapRadiusAddAvp(minor, req,
 354                                PW_GSS_ACCEPTOR_SERVICE_NAME,
 355                                0,
 356                                &nameBuf);
 357     if (GSS_ERROR(major))
 358         return major;
 359
 360     /* Acceptor-Host-Name */
 361     krbPrincComponentToGssBuffer(krbPrinc, 1, &nameBuf);
 362
 363     major = gssEapRadiusAddAvp(minor, req,
 364                                PW_GSS_ACCEPTOR_HOST_NAME,
 365                                0,
 366                                &nameBuf);
 367     if (GSS_ERROR(major))
 368         return major;
 369
 370     if (KRB_PRINC_LENGTH(krbPrinc) > 2) {
 371         /* Acceptor-Service-Specific */
 372         krb5_principal_data ssiPrinc = *krbPrinc;
 373         char *ssi;
 374
 375         KRB_PRINC_LENGTH(&ssiPrinc) -= 2;
 376         KRB_PRINC_NAME(&ssiPrinc) += 2;
 377
 378         *minor = krb5_unparse_name_flags(krbContext, &ssiPrinc,
 379                                          KRB5_PRINCIPAL_UNPARSE_NO_REALM, &ssi);
 380         if (*minor != 0)
 381             return GSS_S_FAILURE;
 382
 383         nameBuf.value = ssi;
 384         nameBuf.length = strlen(ssi);
 385
 386         major = gssEapRadiusAddAvp(minor, req,
 387                                    PW_GSS_ACCEPTOR_SERVICE_SPECIFICS,
 388                                    0,
 389                                    &nameBuf);
 390 #ifdef HAVE_HEIMDAL_VERSION
 391         krb5_xfree(ssi);
 392 #else
 393         krb5_free_unparsed_name(krbContext, ssi);
 394 #endif
 395         if (GSS_ERROR(major))
 396             return major;
 397     }
 398
 399     krbPrincRealmToGssBuffer(krbPrinc, &nameBuf);
 400     if (nameBuf.length != 0) {
 401         /* Acceptor-Realm-Name */
 402         major = gssEapRadiusAddAvp(minor, req,
 403                                    PW_GSS_ACCEPTOR_REALM_NAME,
 404                                    0,
 405                                    &nameBuf);
 406         if (GSS_ERROR(major))
 407             return major;
 408     }
 409
 410     *minor = 0;
 411     return GSS_S_COMPLETE;
 412 }
 413
 414 /*
 415  * Allocate a RadSec handle
 416  */
 417 static OM_uint32
 418 createRadiusHandle(OM_uint32 *minor,
 419                    gss_cred_id_t cred,
 420                    gss_ctx_id_t ctx)
 421 {
 422     struct gss_eap_acceptor_ctx *actx = &ctx->acceptorCtx;
 423     struct rs_error *err;
 424     const char *configStanza = "gss-eap";
 425     OM_uint32 major;
 426
 427     GSSEAP_ASSERT(actx->radContext == NULL);
 428     GSSEAP_ASSERT(actx->radConn == NULL);
 429     GSSEAP_ASSERT(cred != GSS_C_NO_CREDENTIAL);
 430
 431     major = gssEapCreateRadiusContext(minor, cred, &actx->radContext);
 432     if (GSS_ERROR(major))
 433         return major;
 434
 435     if (cred->radiusConfigStanza.value != NULL)
 436         configStanza = (const char *)cred->radiusConfigStanza.value;
 437
 438     if (rs_conn_create(actx->radContext, &actx->radConn, configStanza) != 0) {
 439         err = rs_err_conn_pop(actx->radConn);
 440         return gssEapRadiusMapError(minor, err);
 441     }
 442
 443     if (actx->radServer != NULL) {
 444         if (rs_conn_select_peer(actx->radConn, actx->radServer) != 0) {
 445             err = rs_err_conn_pop(actx->radConn);
 446             return gssEapRadiusMapError(minor, err);
 447         }
 448     }
 449
 450     *minor = 0;
 451     return GSS_S_COMPLETE;
 452 }
 453
 454 /*
 455  * Process a EAP response from the initiator.
 456  */
 457 static OM_uint32
 458 eapGssSmAcceptAuthenticate(OM_uint32 *minor,
 459                            gss_cred_id_t cred,
 460                            gss_ctx_id_t ctx,
 461                            gss_name_t target GSSEAP_UNUSED,
 462                            gss_OID mech GSSEAP_UNUSED,
 463                            OM_uint32 reqFlags GSSEAP_UNUSED,
 464                            OM_uint32 timeReq GSSEAP_UNUSED,
 465                            gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 466                            gss_buffer_t inputToken,
 467                            gss_buffer_t outputToken,
 468                            OM_uint32 *smFlags)
 469 {
 470     OM_uint32 major, tmpMinor;
 471     struct rs_connection *rconn;
 472     struct rs_request *request = NULL;
 473     struct rs_packet *req = NULL, *resp = NULL;
 474     int isAccessChallenge;
 475
 476     if (ctx->acceptorCtx.radContext == NULL) {
 477         /* May be NULL from an imported partial context */
 478         major = createRadiusHandle(minor, cred, ctx);
 479         if (GSS_ERROR(major))
 480             goto cleanup;
 481     }
 482
 483     if (isIdentityResponseP(inputToken)) {
 484         major = importInitiatorIdentity(minor, ctx, inputToken);
 485         if (GSS_ERROR(major))
 486             return major;
 487     }
 488
 489     rconn = ctx->acceptorCtx.radConn;
 490
 491     if (rs_packet_create_authn_request(rconn, &req, NULL, NULL) != 0) {
 492         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 493         goto cleanup;
 494     }
 495
 496     major = setInitiatorIdentity(minor, ctx, req);
 497     if (GSS_ERROR(major))
 498         goto cleanup;
 499
 500     major = setAcceptorIdentity(minor, ctx, req);
 501     if (GSS_ERROR(major))
 502         goto cleanup;
 503
 504     major = gssEapRadiusAddAvp(minor, req,
 505                                PW_EAP_MESSAGE, 0, inputToken);
 506     if (GSS_ERROR(major))
 507         goto cleanup;
 508
 509     if (ctx->acceptorCtx.state.length != 0) {
 510         major = gssEapRadiusAddAvp(minor, req, PW_STATE, 0,
 511                                    &ctx->acceptorCtx.state);
 512         if (GSS_ERROR(major))
 513             goto cleanup;
 514
 515         gss_release_buffer(&tmpMinor, &ctx->acceptorCtx.state);
 516     }
 517
 518     if (rs_request_create(rconn, &request) != 0) {
 519         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 520         goto cleanup;
 521     }
 522
 523     rs_request_add_reqpkt(request, req);
 524     req = NULL;
 525
 526     if (rs_request_send(request, &resp) != 0) {
 527         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 528         goto cleanup;
 529     }
 530
 531     GSSEAP_ASSERT(resp != NULL);
 532
 533     isAccessChallenge = 0;
 534
 535     switch (rs_packet_code(resp)) {
 536     case PW_ACCESS_CHALLENGE:
 537         isAccessChallenge = 1;
 538         break;
 539     case PW_ACCESS_ACCEPT:
 540         break;
 541     case PW_ACCESS_REJECT:
 542         *minor = GSSEAP_RADIUS_AUTH_FAILURE;
 543         major = GSS_S_DEFECTIVE_CREDENTIAL;
 544         goto cleanup;
 545         break;
 546     default:
 547         *minor = GSSEAP_UNKNOWN_RADIUS_CODE;
 548         major = GSS_S_FAILURE;
 549         goto cleanup;
 550         break;
 551     }
 552
 553     major = gssEapRadiusGetAvp(minor, resp, PW_EAP_MESSAGE, 0,
 554                                outputToken, TRUE);
 555     if (major == GSS_S_UNAVAILABLE && isAccessChallenge) {
 556         *minor = GSSEAP_MISSING_EAP_REQUEST;
 557         major = GSS_S_DEFECTIVE_TOKEN;
 558         goto cleanup;
 559     } else if (GSS_ERROR(major))
 560         goto cleanup;
 561
 562     if (isAccessChallenge) {
 563         major = gssEapRadiusGetAvp(minor, resp, PW_STATE, 0,
 564                                    &ctx->acceptorCtx.state, TRUE);
 565         if (GSS_ERROR(major) && *minor != GSSEAP_NO_SUCH_ATTR)
 566             goto cleanup;
 567     } else {
 568         rs_avp **vps;
 569
 570         rs_packet_avps(resp, &vps);
 571
 572         ctx->acceptorCtx.vps = *vps;
 573         *vps = NULL;
 574
 575         major = acceptReadyEap(minor, ctx, cred);
 576         if (GSS_ERROR(major))
 577             goto cleanup;
 578
 579         GSSEAP_SM_TRANSITION_NEXT(ctx);
 580     }
 581
 582     major = GSS_S_CONTINUE_NEEDED;
 583     *minor = 0;
 584     *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 585
 586 cleanup:
 587     if (request != NULL)
 588         rs_request_destroy(request);
 589     if (req != NULL)
 590         rs_packet_destroy(req);
 591     if (resp != NULL)
 592         rs_packet_destroy(resp);
 593     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIATOR_EXTS) {
 594         GSSEAP_ASSERT(major == GSS_S_CONTINUE_NEEDED);
 595
 596         rs_conn_destroy(ctx->acceptorCtx.radConn);
 597         ctx->acceptorCtx.radConn = NULL;
 598     }
 599
 600     return major;
 601 }
 602
 603 static OM_uint32
 604 eapGssSmAcceptGssFlags(OM_uint32 *minor,
 605                        gss_cred_id_t cred GSSEAP_UNUSED,
 606                        gss_ctx_id_t ctx,
 607                        gss_name_t target GSSEAP_UNUSED,
 608                        gss_OID mech GSSEAP_UNUSED,
 609                        OM_uint32 reqFlags GSSEAP_UNUSED,
 610                        OM_uint32 timeReq GSSEAP_UNUSED,
 611                        gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 612                        gss_buffer_t inputToken,
 613                        gss_buffer_t outputToken GSSEAP_UNUSED,
 614                        OM_uint32 *smFlags GSSEAP_UNUSED)
 615 {
 616     unsigned char *p;
 617     OM_uint32 initiatorGssFlags;
 618
 619     GSSEAP_ASSERT((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0);
 620
 621     if (inputToken->length < 4) {
 622         *minor = GSSEAP_TOK_TRUNC;
 623         return GSS_S_DEFECTIVE_TOKEN;
 624     }
 625
 626     /* allow flags to grow for future expansion */
 627     p = (unsigned char *)inputToken->value + inputToken->length - 4;
 628
 629     initiatorGssFlags = load_uint32_be(p);
 630     initiatorGssFlags &= GSSEAP_WIRE_FLAGS_MASK;
 631
 632     ctx->gssFlags |= initiatorGssFlags;
 633
 634     return GSS_S_CONTINUE_NEEDED;
 635 }
 636
 637 static OM_uint32
 638 eapGssSmAcceptGssChannelBindings(OM_uint32 *minor,
 639                                  gss_cred_id_t cred GSSEAP_UNUSED,
 640                                  gss_ctx_id_t ctx,
 641                                  gss_name_t target GSSEAP_UNUSED,
 642                                  gss_OID mech GSSEAP_UNUSED,
 643                                  OM_uint32 reqFlags GSSEAP_UNUSED,
 644                                  OM_uint32 timeReq GSSEAP_UNUSED,
 645                                  gss_channel_bindings_t chanBindings,
 646                                  gss_buffer_t inputToken,
 647                                  gss_buffer_t outputToken GSSEAP_UNUSED,
 648                                  OM_uint32 *smFlags GSSEAP_UNUSED)
 649 {
 650     krb5_error_code code;
 651     krb5_context krbContext;
 652     krb5_data data;
 653     krb5_checksum cksum;
 654     krb5_boolean valid = FALSE;
 655
 656     if (chanBindings == GSS_C_NO_CHANNEL_BINDINGS ||
 657         chanBindings->application_data.length == 0)
 658         return GSS_S_CONTINUE_NEEDED;
 659
 660     GSSEAP_KRB_INIT(&krbContext);
 661
 662     KRB_DATA_INIT(&data);
 663
 664     gssBufferToKrbData(&chanBindings->application_data, &data);
 665
 666     KRB_CHECKSUM_INIT(&cksum, ctx->checksumType, inputToken);
 667
 668     code = krb5_c_verify_checksum(krbContext, &ctx->rfc3961Key,
 669                                   KEY_USAGE_GSSEAP_CHBIND_MIC,
 670                                   &data, &cksum, &valid);
 671     if (code != 0) {
 672         *minor = code;
 673         return GSS_S_FAILURE;
 674     }
 675
 676     if (valid == FALSE) {
 677         *minor = GSSEAP_BINDINGS_MISMATCH;
 678         return GSS_S_BAD_BINDINGS;
 679     }
 680
 681     ctx->flags |= CTX_FLAG_CHANNEL_BINDINGS_VERIFIED;
 682
 683     *minor = 0;
 684     return GSS_S_CONTINUE_NEEDED;
 685 }
 686
 687 static OM_uint32
 688 eapGssSmAcceptInitiatorMIC(OM_uint32 *minor,
 689                            gss_cred_id_t cred GSSEAP_UNUSED,
 690                            gss_ctx_id_t ctx,
 691                            gss_name_t target GSSEAP_UNUSED,
 692                            gss_OID mech GSSEAP_UNUSED,
 693                            OM_uint32 reqFlags GSSEAP_UNUSED,
 694                            OM_uint32 timeReq GSSEAP_UNUSED,
 695                            gss_channel_bindings_t chanBindings,
 696                            gss_buffer_t inputToken,
 697                            gss_buffer_t outputToken GSSEAP_UNUSED,
 698                            OM_uint32 *smFlags GSSEAP_UNUSED)
 699 {
 700     OM_uint32 major;
 701
 702     /*
 703      * The channel binding token is optional, however if the caller indicated
 704      * bindings we must raise an error if it was absent.
 705      *
 706      * In the future, we might use a context option to allow the caller to
 707      * indicate that missing bindings are acceptable.
 708      */
 709     if (chanBindings != NULL &&
 710         chanBindings->application_data.length != 0 &&
 711         (ctx->flags & CTX_FLAG_CHANNEL_BINDINGS_VERIFIED) == 0) {
 712         *minor = GSSEAP_MISSING_BINDINGS;
 713         return GSS_S_BAD_BINDINGS;
 714     }
 715
 716     major = gssEapVerifyTokenMIC(minor, ctx, inputToken);
 717     if (GSS_ERROR(major))
 718         return major;
 719
 720     GSSEAP_SM_TRANSITION_NEXT(ctx);
 721
 722     *minor = 0;
 723     return GSS_S_CONTINUE_NEEDED;
 724 }
 725
 726 #ifdef GSSEAP_ENABLE_REAUTH
 727 static OM_uint32
 728 eapGssSmAcceptReauthCreds(OM_uint32 *minor,
 729                           gss_cred_id_t cred,
 730                           gss_ctx_id_t ctx,
 731                           gss_name_t target GSSEAP_UNUSED,
 732                           gss_OID mech GSSEAP_UNUSED,
 733                           OM_uint32 reqFlags GSSEAP_UNUSED,
 734                           OM_uint32 timeReq GSSEAP_UNUSED,
 735                           gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 736                           gss_buffer_t inputToken GSSEAP_UNUSED,
 737                           gss_buffer_t outputToken,
 738                           OM_uint32 *smFlags GSSEAP_UNUSED)
 739 {
 740     OM_uint32 major;
 741
 742     /*
 743      * If we're built with fast reauthentication enabled, then
 744      * fabricate a ticket from the initiator to ourselves.
 745      */
 746     major = gssEapMakeReauthCreds(minor, ctx, cred, outputToken);
 747     if (major == GSS_S_UNAVAILABLE)
 748         major = GSS_S_COMPLETE;
 749     if (major == GSS_S_COMPLETE)
 750         major = GSS_S_CONTINUE_NEEDED;
 751
 752     return major;
 753 }
 754 #endif
 755
 756 static OM_uint32
 757 eapGssSmAcceptAcceptorMIC(OM_uint32 *minor,
 758                           gss_cred_id_t cred GSSEAP_UNUSED,
 759                           gss_ctx_id_t ctx,
 760                           gss_name_t target GSSEAP_UNUSED,
 761                           gss_OID mech GSSEAP_UNUSED,
 762                           OM_uint32 reqFlags GSSEAP_UNUSED,
 763                           OM_uint32 timeReq GSSEAP_UNUSED,
 764                           gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 765                           gss_buffer_t inputToken GSSEAP_UNUSED,
 766                           gss_buffer_t outputToken,
 767                           OM_uint32 *smFlags)
 768 {
 769     OM_uint32 major;
 770
 771     major = gssEapMakeTokenMIC(minor, ctx, outputToken);
 772     if (GSS_ERROR(major))
 773         return major;
 774
 775     GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 776
 777     *minor = 0;
 778     *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 779
 780     return GSS_S_COMPLETE;
 781 }
 782
 783 static struct gss_eap_sm eapGssAcceptorSm[] = {
 784     {
 785         ITOK_TYPE_ACCEPTOR_NAME_REQ,
 786         ITOK_TYPE_ACCEPTOR_NAME_RESP,
 787         GSSEAP_STATE_INITIAL,
 788         0,
 789         eapGssSmAcceptAcceptorName
 790     },
 791 #ifdef GSSEAP_DEBUG
 792     {
 793         ITOK_TYPE_VENDOR_INFO,
 794         ITOK_TYPE_NONE,
 795         GSSEAP_STATE_INITIAL,
 796         0,
 797         eapGssSmAcceptVendorInfo,
 798     },
 799 #endif
 800 #ifdef GSSEAP_ENABLE_REAUTH
 801     {
 802         ITOK_TYPE_REAUTH_REQ,
 803         ITOK_TYPE_REAUTH_RESP,
 804         GSSEAP_STATE_INITIAL,
 805         0,
 806         eapGssSmAcceptGssReauth,
 807     },
 808 #endif
 809     {
 810         ITOK_TYPE_NONE,
 811         ITOK_TYPE_EAP_REQ,
 812         GSSEAP_STATE_INITIAL,
 813         SM_ITOK_FLAG_REQUIRED,
 814         eapGssSmAcceptIdentity,
 815     },
 816     {
 817         ITOK_TYPE_EAP_RESP,
 818         ITOK_TYPE_EAP_REQ,
 819         GSSEAP_STATE_AUTHENTICATE,
 820         SM_ITOK_FLAG_REQUIRED,
 821         eapGssSmAcceptAuthenticate
 822     },
 823     {
 824         ITOK_TYPE_GSS_FLAGS,
 825         ITOK_TYPE_NONE,
 826         GSSEAP_STATE_INITIATOR_EXTS,
 827         0,
 828         eapGssSmAcceptGssFlags
 829     },
 830     {
 831         ITOK_TYPE_GSS_CHANNEL_BINDINGS,
 832         ITOK_TYPE_NONE,
 833         GSSEAP_STATE_INITIATOR_EXTS,
 834         0,
 835         eapGssSmAcceptGssChannelBindings,
 836     },
 837     {
 838         ITOK_TYPE_INITIATOR_MIC,
 839         ITOK_TYPE_NONE,
 840         GSSEAP_STATE_INITIATOR_EXTS,
 841         SM_ITOK_FLAG_REQUIRED,
 842         eapGssSmAcceptInitiatorMIC,
 843     },
 844 #ifdef GSSEAP_ENABLE_REAUTH
 845     {
 846         ITOK_TYPE_NONE,
 847         ITOK_TYPE_REAUTH_CREDS,
 848         GSSEAP_STATE_ACCEPTOR_EXTS,
 849         0,
 850         eapGssSmAcceptReauthCreds,
 851     },
 852 #endif
 853     {
 854         ITOK_TYPE_NONE,
 855         ITOK_TYPE_ACCEPTOR_NAME_RESP,
 856         GSSEAP_STATE_ACCEPTOR_EXTS,
 857         0,
 858         eapGssSmAcceptAcceptorName
 859     },
 860     {
 861         ITOK_TYPE_NONE,
 862         ITOK_TYPE_ACCEPTOR_MIC,
 863         GSSEAP_STATE_ACCEPTOR_EXTS,
 864         0,
 865         eapGssSmAcceptAcceptorMIC
 866     },
 867 };
 868
 869 OM_uint32
 870 gssEapAcceptSecContext(OM_uint32 *minor,
 871                        gss_ctx_id_t ctx,
 872                        gss_cred_id_t cred,
 873                        gss_buffer_t input_token,
 874                        gss_channel_bindings_t input_chan_bindings,
 875                        gss_name_t *src_name,
 876                        gss_OID *mech_type,
 877                        gss_buffer_t output_token,
 878                        OM_uint32 *ret_flags,
 879                        OM_uint32 *time_rec,
 880                        gss_cred_id_t *delegated_cred_handle)
 881 {
 882     OM_uint32 major, tmpMinor;
 883
 884     if (cred == GSS_C_NO_CREDENTIAL) {
 885         if (ctx->cred == GSS_C_NO_CREDENTIAL) {
 886             major = gssEapAcquireCred(minor,
 887                                       GSS_C_NO_NAME,
 888                                       GSS_C_INDEFINITE,
 889                                       GSS_C_NO_OID_SET,
 890                                       GSS_C_ACCEPT,
 891                                       &ctx->cred,
 892                                       NULL,
 893                                       NULL);
 894             if (GSS_ERROR(major))
 895                 goto cleanup;
 896         }
 897
 898         cred = ctx->cred;
 899     }
 900
 901     /*
 902      * Previously we acquired the credential mutex here, but it should not be
 903      * necessary as the acceptor does not access any mutable elements of the
 904      * credential handle.
 905      */
 906
 907     if (cred->name != GSS_C_NO_NAME) {
 908         major = gssEapDuplicateName(minor, cred->name, &ctx->acceptorName);
 909         if (GSS_ERROR(major))
 910             goto cleanup;
 911     }
 912
 913     major = gssEapSmStep(minor,
 914                          cred,
 915                          ctx,
 916                          GSS_C_NO_NAME,
 917                          GSS_C_NO_OID,
 918                          0,
 919                          GSS_C_INDEFINITE,
 920                          input_chan_bindings,
 921                          input_token,
 922                          output_token,
 923                          eapGssAcceptorSm,
 924                          sizeof(eapGssAcceptorSm) / sizeof(eapGssAcceptorSm[0]));
 925     if (GSS_ERROR(major))
 926         goto cleanup;
 927
 928     if (mech_type != NULL) {
 929         OM_uint32 tmpMajor;
 930
 931         tmpMajor = gssEapCanonicalizeOid(&tmpMinor, ctx->mechanismUsed, 0, mech_type);
 932         if (GSS_ERROR(tmpMajor)) {
 933             major = tmpMajor;
 934             *minor = tmpMinor;
 935             goto cleanup;
 936         }
 937     }
 938     if (ret_flags != NULL)
 939         *ret_flags = ctx->gssFlags;
 940     if (delegated_cred_handle != NULL)
 941         *delegated_cred_handle = GSS_C_NO_CREDENTIAL;
 942
 943     if (major == GSS_S_COMPLETE) {
 944         if (src_name != NULL && ctx->initiatorName != GSS_C_NO_NAME) {
 945             major = gssEapDuplicateName(&tmpMinor, ctx->initiatorName, src_name);
 946             if (GSS_ERROR(major))
 947                 goto cleanup;
 948         }
 949         if (time_rec != NULL) {
 950             major = gssEapContextTime(&tmpMinor, ctx, time_rec);
 951             if (GSS_ERROR(major))
 952                 goto cleanup;
 953         }
 954     }
 955
 956     GSSEAP_ASSERT(CTX_IS_ESTABLISHED(ctx) || major == GSS_S_CONTINUE_NEEDED);
 957
 958 cleanup:
 959     return major;
 960 }
 961
 962 #ifdef GSSEAP_ENABLE_REAUTH
 963 static OM_uint32
 964 acceptReadyKrb(OM_uint32 *minor,
 965                gss_ctx_id_t ctx,
 966                gss_cred_id_t cred,
 967                const gss_name_t initiator,
 968                const gss_OID mech,
 969                OM_uint32 timeRec)
 970 {
 971     OM_uint32 major;
 972
 973     major = gssEapGlueToMechName(minor, ctx, initiator, &ctx->initiatorName);
 974     if (GSS_ERROR(major))
 975         return major;
 976
 977     major = gssEapReauthComplete(minor, ctx, cred, mech, timeRec);
 978     if (GSS_ERROR(major))
 979         return major;
 980
 981     *minor = 0;
 982     return GSS_S_COMPLETE;
 983 }
 984
 985 static OM_uint32
 986 eapGssSmAcceptGssReauth(OM_uint32 *minor,
 987                         gss_cred_id_t cred,
 988                         gss_ctx_id_t ctx,
 989                         gss_name_t target GSSEAP_UNUSED,
 990                         gss_OID mech,
 991                         OM_uint32 reqFlags GSSEAP_UNUSED,
 992                         OM_uint32 timeReq GSSEAP_UNUSED,
 993                         gss_channel_bindings_t chanBindings,
 994                         gss_buffer_t inputToken,
 995                         gss_buffer_t outputToken,
 996                         OM_uint32 *smFlags)
 997 {
 998     OM_uint32 major, tmpMinor;
 999     gss_name_t krbInitiator = GSS_C_NO_NAME;
1000     OM_uint32 gssFlags, timeRec = GSS_C_INDEFINITE;
1001
1002     /*
1003      * If we're built with fast reauthentication support, it's valid
1004      * for an initiator to send a GSS reauthentication token as its
1005      * initial context token, causing us to short-circuit the state
1006      * machine and process Kerberos GSS messages instead.
1007      */
1008
1009     ctx->flags |= CTX_FLAG_KRB_REAUTH;
1010
1011     major = gssAcceptSecContext(minor,
1012                                 &ctx->reauthCtx,
1013                                 cred->reauthCred,
1014                                 inputToken,
1015                                 chanBindings,
1016                                 &krbInitiator,
1017                                 &mech,
1018                                 outputToken,
1019                                 &gssFlags,
1020                                 &timeRec,
1021                                 NULL);
1022     if (major == GSS_S_COMPLETE) {
1023         major = acceptReadyKrb(minor, ctx, cred,
1024                                krbInitiator, mech, timeRec);
1025         if (major == GSS_S_COMPLETE) {
1026             GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
1027         }
1028         ctx->gssFlags = gssFlags;
1029     } else if (GSS_ERROR(major) &&
1030         (*smFlags & SM_FLAG_INPUT_TOKEN_CRITICAL) == 0) {
1031         /* pretend reauthentication attempt never happened */
1032         gssDeleteSecContext(&tmpMinor, &ctx->reauthCtx, GSS_C_NO_BUFFER);
1033         ctx->flags &= ~(CTX_FLAG_KRB_REAUTH);
1034         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_INITIAL);
1035         major = GSS_S_CONTINUE_NEEDED;
1036     }
1037
1038     gssReleaseName(&tmpMinor, &krbInitiator);
1039
1040     return major;
1041 }
1042 #endif /* GSSEAP_ENABLE_REAUTH */
1043
1044 OM_uint32 GSSAPI_CALLCONV
1045 gss_accept_sec_context(OM_uint32 *minor,
1046                        gss_ctx_id_t *context_handle,
1047                        gss_cred_id_t cred,
1048                        gss_buffer_t input_token,
1049                        gss_channel_bindings_t input_chan_bindings,
1050                        gss_name_t *src_name,
1051                        gss_OID *mech_type,
1052                        gss_buffer_t output_token,
1053                        OM_uint32 *ret_flags,
1054                        OM_uint32 *time_rec,
1055                        gss_cred_id_t *delegated_cred_handle)
1056 {
1057     OM_uint32 major, tmpMinor;
1058     gss_ctx_id_t ctx = *context_handle;
1059
1060     *minor = 0;
1061
1062     output_token->length = 0;
1063     output_token->value = NULL;
1064
1065     if (src_name != NULL)
1066         *src_name = GSS_C_NO_NAME;
1067
1068     if (input_token == GSS_C_NO_BUFFER || input_token->length == 0) {
1069         *minor = GSSEAP_TOK_TRUNC;
1070         return GSS_S_DEFECTIVE_TOKEN;
1071     }
1072
1073     if (ctx == GSS_C_NO_CONTEXT) {
1074         major = gssEapAllocContext(minor, &ctx);
1075         if (GSS_ERROR(major))
1076             return major;
1077
1078         *context_handle = ctx;
1079     }
1080
1081     GSSEAP_MUTEX_LOCK(&ctx->mutex);
1082
1083     major = gssEapAcceptSecContext(minor,
1084                                    ctx,
1085                                    cred,
1086                                    input_token,
1087                                    input_chan_bindings,
1088                                    src_name,
1089                                    mech_type,
1090                                    output_token,
1091                                    ret_flags,
1092                                    time_rec,
1093                                    delegated_cred_handle);
1094
1095     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
1096
1097     if (GSS_ERROR(major))
1098         gssEapReleaseContext(&tmpMinor, context_handle);
1099
1100     return major;
1101 }