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