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

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