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     GSSEAP_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     GSSEAP_ASSERT(krbPrinc != NULL);
 347     GSSEAP_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         *minor = krbPrincUnparseServiceSpecifics(krbContext,
 372                                                  krbPrinc, &nameBuf);
 373         if (*minor != 0)
 374             return GSS_S_FAILURE;
 375
 376         major = gssEapRadiusAddAvp(minor, vps,
 377                                    PW_GSS_ACCEPTOR_SERVICE_SPECIFIC,
 378                                    VENDORPEC_UKERNA,
 379                                    &nameBuf);
 380
 381         if (GSS_ERROR(major)) {
 382             krbFreeUnparsedName(krbContext, &nameBuf);
 383             return major;
 384         }
 385         krbFreeUnparsedName(krbContext, &nameBuf);
 386     }
 387
 388     krbPrincRealmToGssBuffer(krbPrinc, &nameBuf);
 389     if (nameBuf.length != 0) {
 390         /* Acceptor-Realm-Name */
 391         major = gssEapRadiusAddAvp(minor, vps,
 392                                    PW_GSS_ACCEPTOR_REALM_NAME,
 393                                    VENDORPEC_UKERNA,
 394                                    &nameBuf);
 395         if (GSS_ERROR(major))
 396             return major;
 397     }
 398
 399     *minor = 0;
 400     return GSS_S_COMPLETE;
 401 }
 402
 403 /*
 404  * Allocate a RadSec handle
 405  */
 406 static OM_uint32
 407 createRadiusHandle(OM_uint32 *minor,
 408                    gss_cred_id_t cred,
 409                    gss_ctx_id_t ctx)
 410 {
 411     struct gss_eap_acceptor_ctx *actx = &ctx->acceptorCtx;
 412     struct rs_error *err;
 413     const char *configStanza = "gss-eap";
 414     OM_uint32 major;
 415
 416     GSSEAP_ASSERT(actx->radContext == NULL);
 417     GSSEAP_ASSERT(actx->radConn == NULL);
 418     GSSEAP_ASSERT(cred != GSS_C_NO_CREDENTIAL);
 419
 420     major = gssEapCreateRadiusContext(minor, cred, &actx->radContext);
 421     if (GSS_ERROR(major))
 422         return major;
 423
 424     if (cred->radiusConfigStanza.value != NULL)
 425         configStanza = (const char *)cred->radiusConfigStanza.value;
 426
 427     if (rs_conn_create(actx->radContext, &actx->radConn, configStanza) != 0) {
 428         err = rs_err_conn_pop(actx->radConn);
 429         return gssEapRadiusMapError(minor, err);
 430     }
 431
 432     if (actx->radServer != NULL) {
 433         if (rs_conn_select_peer(actx->radConn, actx->radServer) != 0) {
 434             err = rs_err_conn_pop(actx->radConn);
 435             return gssEapRadiusMapError(minor, err);
 436         }
 437     }
 438
 439     *minor = 0;
 440     return GSS_S_COMPLETE;
 441 }
 442
 443 /*
 444  * Process a EAP response from the initiator.
 445  */
 446 static OM_uint32
 447 eapGssSmAcceptAuthenticate(OM_uint32 *minor,
 448                            gss_cred_id_t cred,
 449                            gss_ctx_id_t ctx,
 450                            gss_name_t target GSSEAP_UNUSED,
 451                            gss_OID mech GSSEAP_UNUSED,
 452                            OM_uint32 reqFlags GSSEAP_UNUSED,
 453                            OM_uint32 timeReq GSSEAP_UNUSED,
 454                            gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 455                            gss_buffer_t inputToken,
 456                            gss_buffer_t outputToken,
 457                            OM_uint32 *smFlags)
 458 {
 459     OM_uint32 major, tmpMinor;
 460     struct rs_connection *rconn;
 461     struct rs_request *request = NULL;
 462     struct rs_packet *req = NULL, *resp = NULL;
 463     struct radius_packet *frreq, *frresp;
 464
 465     if (ctx->acceptorCtx.radContext == NULL) {
 466         /* May be NULL from an imported partial context */
 467         major = createRadiusHandle(minor, cred, ctx);
 468         if (GSS_ERROR(major))
 469             goto cleanup;
 470     }
 471
 472     if (isIdentityResponseP(inputToken)) {
 473         major = importInitiatorIdentity(minor, ctx, inputToken);
 474         if (GSS_ERROR(major))
 475             return major;
 476     }
 477
 478     rconn = ctx->acceptorCtx.radConn;
 479
 480     if (rs_packet_create_authn_request(rconn, &req, NULL, NULL) != 0) {
 481         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 482         goto cleanup;
 483     }
 484     frreq = rs_packet_frpkt(req);
 485
 486     major = setInitiatorIdentity(minor, ctx, &frreq->vps);
 487     if (GSS_ERROR(major))
 488         goto cleanup;
 489
 490     major = setAcceptorIdentity(minor, ctx, &frreq->vps);
 491     if (GSS_ERROR(major))
 492         goto cleanup;
 493
 494     major = gssEapRadiusAddAvp(minor, &frreq->vps,
 495                                PW_EAP_MESSAGE, 0, inputToken);
 496     if (GSS_ERROR(major))
 497         goto cleanup;
 498
 499     if (ctx->acceptorCtx.state.length != 0) {
 500         major = gssEapRadiusAddAvp(minor, &frreq->vps, PW_STATE, 0,
 501                                    &ctx->acceptorCtx.state);
 502         if (GSS_ERROR(major))
 503             goto cleanup;
 504
 505         gss_release_buffer(&tmpMinor, &ctx->acceptorCtx.state);
 506     }
 507
 508     if (rs_request_create(rconn, &request) != 0) {
 509         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 510         goto cleanup;
 511     }
 512
 513     rs_request_add_reqpkt(request, req);
 514     req = NULL;
 515
 516     if (rs_request_send(request, &resp) != 0) {
 517         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 518         goto cleanup;
 519     }
 520
 521     GSSEAP_ASSERT(resp != NULL);
 522
 523     frresp = rs_packet_frpkt(resp);
 524     switch (frresp->code) {
 525     case PW_ACCESS_CHALLENGE:
 526     case PW_AUTHENTICATION_ACK:
 527         break;
 528     case PW_AUTHENTICATION_REJECT:
 529         *minor = GSSEAP_RADIUS_AUTH_FAILURE;
 530         major = GSS_S_DEFECTIVE_CREDENTIAL;
 531         goto cleanup;
 532         break;
 533     default:
 534         *minor = GSSEAP_UNKNOWN_RADIUS_CODE;
 535         major = GSS_S_FAILURE;
 536         goto cleanup;
 537         break;
 538     }
 539
 540     major = gssEapRadiusGetAvp(minor, frresp->vps, PW_EAP_MESSAGE, 0,
 541                                outputToken, TRUE);
 542     if (major == GSS_S_UNAVAILABLE && frresp->code == PW_ACCESS_CHALLENGE) {
 543         *minor = GSSEAP_MISSING_EAP_REQUEST;
 544         major = GSS_S_DEFECTIVE_TOKEN;
 545         goto cleanup;
 546     } else if (GSS_ERROR(major))
 547         goto cleanup;
 548
 549     if (frresp->code == PW_ACCESS_CHALLENGE) {
 550         major = gssEapRadiusGetAvp(minor, frresp->vps, PW_STATE, 0,
 551                                    &ctx->acceptorCtx.state, TRUE);
 552         if (GSS_ERROR(major) && *minor != GSSEAP_NO_SUCH_ATTR)
 553             goto cleanup;
 554     } else {
 555         ctx->acceptorCtx.vps = frresp->vps;
 556         frresp->vps = NULL;
 557
 558         major = acceptReadyEap(minor, ctx, cred);
 559         if (GSS_ERROR(major))
 560             goto cleanup;
 561
 562         GSSEAP_SM_TRANSITION_NEXT(ctx);
 563     }
 564
 565     major = GSS_S_CONTINUE_NEEDED;
 566     *minor = 0;
 567     *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 568
 569 cleanup:
 570     if (request != NULL)
 571         rs_request_destroy(request);
 572     if (req != NULL)
 573         rs_packet_destroy(req);
 574     if (resp != NULL)
 575         rs_packet_destroy(resp);
 576     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIATOR_EXTS) {
 577         GSSEAP_ASSERT(major == GSS_S_CONTINUE_NEEDED);
 578
 579         rs_conn_destroy(ctx->acceptorCtx.radConn);
 580         ctx->acceptorCtx.radConn = NULL;
 581     }
 582
 583     return major;
 584 }
 585
 586 static OM_uint32
 587 eapGssSmAcceptGssFlags(OM_uint32 *minor,
 588                        gss_cred_id_t cred GSSEAP_UNUSED,
 589                        gss_ctx_id_t ctx,
 590                        gss_name_t target GSSEAP_UNUSED,
 591                        gss_OID mech GSSEAP_UNUSED,
 592                        OM_uint32 reqFlags GSSEAP_UNUSED,
 593                        OM_uint32 timeReq GSSEAP_UNUSED,
 594                        gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 595                        gss_buffer_t inputToken,
 596                        gss_buffer_t outputToken GSSEAP_UNUSED,
 597                        OM_uint32 *smFlags GSSEAP_UNUSED)
 598 {
 599     unsigned char *p;
 600     OM_uint32 initiatorGssFlags;
 601
 602     GSSEAP_ASSERT((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0);
 603
 604     if (inputToken->length < 4) {
 605         *minor = GSSEAP_TOK_TRUNC;
 606         return GSS_S_DEFECTIVE_TOKEN;
 607     }
 608
 609     /* allow flags to grow for future expansion */
 610     p = (unsigned char *)inputToken->value + inputToken->length - 4;
 611
 612     initiatorGssFlags = load_uint32_be(p);
 613     initiatorGssFlags &= GSSEAP_WIRE_FLAGS_MASK;
 614
 615     ctx->gssFlags |= initiatorGssFlags;
 616
 617     return GSS_S_CONTINUE_NEEDED;
 618 }
 619
 620 static OM_uint32
 621 eapGssSmAcceptGssChannelBindings(OM_uint32 *minor,
 622                                  gss_cred_id_t cred GSSEAP_UNUSED,
 623                                  gss_ctx_id_t ctx,
 624                                  gss_name_t target GSSEAP_UNUSED,
 625                                  gss_OID mech GSSEAP_UNUSED,
 626                                  OM_uint32 reqFlags GSSEAP_UNUSED,
 627                                  OM_uint32 timeReq GSSEAP_UNUSED,
 628                                  gss_channel_bindings_t chanBindings,
 629                                  gss_buffer_t inputToken,
 630                                  gss_buffer_t outputToken GSSEAP_UNUSED,
 631                                  OM_uint32 *smFlags GSSEAP_UNUSED)
 632 {
 633     OM_uint32 major;
 634     gss_iov_buffer_desc iov[2];
 635
 636     iov[0].type = GSS_IOV_BUFFER_TYPE_DATA | GSS_IOV_BUFFER_FLAG_ALLOCATE;
 637     iov[0].buffer.length = 0;
 638     iov[0].buffer.value = NULL;
 639
 640     iov[1].type = GSS_IOV_BUFFER_TYPE_STREAM | GSS_IOV_BUFFER_FLAG_ALLOCATED;
 641
 642     /* XXX necessary because decrypted in place and we verify it later */
 643     major = duplicateBuffer(minor, inputToken, &iov[1].buffer);
 644     if (GSS_ERROR(major))
 645         return major;
 646
 647     major = gssEapUnwrapOrVerifyMIC(minor, ctx, NULL, NULL,
 648                                     iov, 2, TOK_TYPE_WRAP);
 649     if (GSS_ERROR(major)) {
 650         gssEapReleaseIov(iov, 2);
 651         return major;
 652     }
 653
 654     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS &&
 655         !bufferEqual(&iov[0].buffer, &chanBindings->application_data)) {
 656         major = GSS_S_BAD_BINDINGS;
 657         *minor = GSSEAP_BINDINGS_MISMATCH;
 658     } else {
 659         major = GSS_S_CONTINUE_NEEDED;
 660         *minor = 0;
 661     }
 662
 663     gssEapReleaseIov(iov, 2);
 664
 665     return major;
 666 }
 667
 668 static OM_uint32
 669 eapGssSmAcceptInitiatorMIC(OM_uint32 *minor,
 670                            gss_cred_id_t cred GSSEAP_UNUSED,
 671                            gss_ctx_id_t ctx,
 672                            gss_name_t target GSSEAP_UNUSED,
 673                            gss_OID mech GSSEAP_UNUSED,
 674                            OM_uint32 reqFlags GSSEAP_UNUSED,
 675                            OM_uint32 timeReq GSSEAP_UNUSED,
 676                            gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 677                            gss_buffer_t inputToken,
 678                            gss_buffer_t outputToken GSSEAP_UNUSED,
 679                            OM_uint32 *smFlags GSSEAP_UNUSED)
 680 {
 681     OM_uint32 major;
 682
 683     major = gssEapVerifyTokenMIC(minor, ctx, inputToken);
 684     if (GSS_ERROR(major))
 685         return major;
 686
 687     GSSEAP_SM_TRANSITION_NEXT(ctx);
 688
 689     *minor = 0;
 690     return GSS_S_CONTINUE_NEEDED;
 691 }
 692
 693 #ifdef GSSEAP_ENABLE_REAUTH
 694 static OM_uint32
 695 eapGssSmAcceptReauthCreds(OM_uint32 *minor,
 696                           gss_cred_id_t cred,
 697                           gss_ctx_id_t ctx,
 698                           gss_name_t target GSSEAP_UNUSED,
 699                           gss_OID mech GSSEAP_UNUSED,
 700                           OM_uint32 reqFlags GSSEAP_UNUSED,
 701                           OM_uint32 timeReq GSSEAP_UNUSED,
 702                           gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 703                           gss_buffer_t inputToken GSSEAP_UNUSED,
 704                           gss_buffer_t outputToken,
 705                           OM_uint32 *smFlags GSSEAP_UNUSED)
 706 {
 707     OM_uint32 major;
 708
 709     /*
 710      * If we're built with fast reauthentication enabled, then
 711      * fabricate a ticket from the initiator to ourselves.
 712      */
 713     major = gssEapMakeReauthCreds(minor, ctx, cred, outputToken);
 714     if (major == GSS_S_UNAVAILABLE)
 715         major = GSS_S_COMPLETE;
 716     if (major == GSS_S_COMPLETE)
 717         major = GSS_S_CONTINUE_NEEDED;
 718
 719     return major;
 720 }
 721 #endif
 722
 723 static OM_uint32
 724 eapGssSmAcceptAcceptorMIC(OM_uint32 *minor,
 725                           gss_cred_id_t cred GSSEAP_UNUSED,
 726                           gss_ctx_id_t ctx,
 727                           gss_name_t target GSSEAP_UNUSED,
 728                           gss_OID mech GSSEAP_UNUSED,
 729                           OM_uint32 reqFlags GSSEAP_UNUSED,
 730                           OM_uint32 timeReq GSSEAP_UNUSED,
 731                           gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 732                           gss_buffer_t inputToken GSSEAP_UNUSED,
 733                           gss_buffer_t outputToken,
 734                           OM_uint32 *smFlags)
 735 {
 736     OM_uint32 major;
 737
 738     major = gssEapMakeTokenMIC(minor, ctx, outputToken);
 739     if (GSS_ERROR(major))
 740         return major;
 741
 742     GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 743
 744     *minor = 0;
 745     *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 746
 747     return GSS_S_COMPLETE;
 748 }
 749
 750 static struct gss_eap_sm eapGssAcceptorSm[] = {
 751     {
 752         ITOK_TYPE_ACCEPTOR_NAME_REQ,
 753         ITOK_TYPE_ACCEPTOR_NAME_RESP,
 754         GSSEAP_STATE_INITIAL,
 755         0,
 756         eapGssSmAcceptAcceptorName
 757     },
 758 #ifdef GSSEAP_DEBUG
 759     {
 760         ITOK_TYPE_VENDOR_INFO,
 761         ITOK_TYPE_NONE,
 762         GSSEAP_STATE_INITIAL,
 763         0,
 764         eapGssSmAcceptVendorInfo,
 765     },
 766 #endif
 767 #ifdef GSSEAP_ENABLE_REAUTH
 768     {
 769         ITOK_TYPE_REAUTH_REQ,
 770         ITOK_TYPE_REAUTH_RESP,
 771         GSSEAP_STATE_INITIAL,
 772         0,
 773         eapGssSmAcceptGssReauth,
 774     },
 775 #endif
 776     {
 777         ITOK_TYPE_NONE,
 778         ITOK_TYPE_EAP_REQ,
 779         GSSEAP_STATE_INITIAL,
 780         SM_ITOK_FLAG_REQUIRED,
 781         eapGssSmAcceptIdentity,
 782     },
 783     {
 784         ITOK_TYPE_EAP_RESP,
 785         ITOK_TYPE_EAP_REQ,
 786         GSSEAP_STATE_AUTHENTICATE,
 787         SM_ITOK_FLAG_REQUIRED,
 788         eapGssSmAcceptAuthenticate
 789     },
 790     {
 791         ITOK_TYPE_GSS_FLAGS,
 792         ITOK_TYPE_NONE,
 793         GSSEAP_STATE_INITIATOR_EXTS,
 794         0,
 795         eapGssSmAcceptGssFlags
 796     },
 797     {
 798         ITOK_TYPE_GSS_CHANNEL_BINDINGS,
 799         ITOK_TYPE_NONE,
 800         GSSEAP_STATE_INITIATOR_EXTS,
 801         SM_ITOK_FLAG_REQUIRED,
 802         eapGssSmAcceptGssChannelBindings,
 803     },
 804     {
 805         ITOK_TYPE_INITIATOR_MIC,
 806         ITOK_TYPE_NONE,
 807         GSSEAP_STATE_INITIATOR_EXTS,
 808         SM_ITOK_FLAG_REQUIRED,
 809         eapGssSmAcceptInitiatorMIC,
 810     },
 811 #ifdef GSSEAP_ENABLE_REAUTH
 812     {
 813         ITOK_TYPE_NONE,
 814         ITOK_TYPE_REAUTH_CREDS,
 815         GSSEAP_STATE_ACCEPTOR_EXTS,
 816         0,
 817         eapGssSmAcceptReauthCreds,
 818     },
 819 #endif
 820     {
 821         ITOK_TYPE_NONE,
 822         ITOK_TYPE_ACCEPTOR_MIC,
 823         GSSEAP_STATE_ACCEPTOR_EXTS,
 824         0,
 825         eapGssSmAcceptAcceptorMIC
 826     },
 827 };
 828
 829 OM_uint32
 830 gssEapAcceptSecContext(OM_uint32 *minor,
 831                        gss_ctx_id_t ctx,
 832                        gss_cred_id_t cred,
 833                        gss_buffer_t input_token,
 834                        gss_channel_bindings_t input_chan_bindings,
 835                        gss_name_t *src_name,
 836                        gss_OID *mech_type,
 837                        gss_buffer_t output_token,
 838                        OM_uint32 *ret_flags,
 839                        OM_uint32 *time_rec,
 840                        gss_cred_id_t *delegated_cred_handle)
 841 {
 842     OM_uint32 major, tmpMinor;
 843
 844     if (cred == GSS_C_NO_CREDENTIAL) {
 845         if (ctx->cred == GSS_C_NO_CREDENTIAL) {
 846             major = gssEapAcquireCred(minor,
 847                                       GSS_C_NO_NAME,
 848                                       GSS_C_INDEFINITE,
 849                                       GSS_C_NO_OID_SET,
 850                                       GSS_C_ACCEPT,
 851                                       &ctx->cred,
 852                                       NULL,
 853                                       NULL);
 854             if (GSS_ERROR(major))
 855                 goto cleanup;
 856         }
 857
 858         cred = ctx->cred;
 859     }
 860
 861     /*
 862      * Previously we acquired the credential mutex here, but it should not be
 863      * necessary as the acceptor does not access any mutable elements of the
 864      * credential handle.
 865      */
 866
 867     /*
 868      * Calling gssEapInquireCred() forces the default acceptor credential name
 869      * to be resolved.
 870      */
 871     major = gssEapInquireCred(minor, cred, &ctx->acceptorName, NULL, NULL, NULL);
 872     if (GSS_ERROR(major))
 873         goto cleanup;
 874
 875     major = gssEapSmStep(minor,
 876                          cred,
 877                          ctx,
 878                          GSS_C_NO_NAME,
 879                          GSS_C_NO_OID,
 880                          0,
 881                          GSS_C_INDEFINITE,
 882                          input_chan_bindings,
 883                          input_token,
 884                          output_token,
 885                          eapGssAcceptorSm,
 886                          sizeof(eapGssAcceptorSm) / sizeof(eapGssAcceptorSm[0]));
 887     if (GSS_ERROR(major))
 888         goto cleanup;
 889
 890     if (mech_type != NULL) {
 891         OM_uint32 tmpMajor;
 892
 893         tmpMajor = gssEapCanonicalizeOid(&tmpMinor, ctx->mechanismUsed, 0, mech_type);
 894         if (GSS_ERROR(tmpMajor)) {
 895             major = tmpMajor;
 896             *minor = tmpMinor;
 897             goto cleanup;
 898         }
 899     }
 900     if (ret_flags != NULL)
 901         *ret_flags = ctx->gssFlags;
 902     if (delegated_cred_handle != NULL)
 903         *delegated_cred_handle = GSS_C_NO_CREDENTIAL;
 904
 905     if (major == GSS_S_COMPLETE) {
 906         if (src_name != NULL && ctx->initiatorName != GSS_C_NO_NAME) {
 907             major = gssEapDuplicateName(&tmpMinor, ctx->initiatorName, src_name);
 908             if (GSS_ERROR(major))
 909                 goto cleanup;
 910         }
 911         if (time_rec != NULL) {
 912             major = gssEapContextTime(&tmpMinor, ctx, time_rec);
 913             if (GSS_ERROR(major))
 914                 goto cleanup;
 915         }
 916     }
 917
 918     GSSEAP_ASSERT(CTX_IS_ESTABLISHED(ctx) || major == GSS_S_CONTINUE_NEEDED);
 919
 920 cleanup:
 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->reauthCred,
 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 */
1005
1006 OM_uint32 GSSAPI_CALLCONV
1007 gss_accept_sec_context(OM_uint32 *minor,
1008                        gss_ctx_id_t *context_handle,
1009                        gss_cred_id_t cred,
1010                        gss_buffer_t input_token,
1011                        gss_channel_bindings_t input_chan_bindings,
1012                        gss_name_t *src_name,
1013                        gss_OID *mech_type,
1014                        gss_buffer_t output_token,
1015                        OM_uint32 *ret_flags,
1016                        OM_uint32 *time_rec,
1017                        gss_cred_id_t *delegated_cred_handle)
1018 {
1019     OM_uint32 major, tmpMinor;
1020     gss_ctx_id_t ctx = *context_handle;
1021
1022     *minor = 0;
1023
1024     output_token->length = 0;
1025     output_token->value = NULL;
1026
1027     if (src_name != NULL)
1028         *src_name = GSS_C_NO_NAME;
1029
1030     if (input_token == GSS_C_NO_BUFFER || input_token->length == 0) {
1031         *minor = GSSEAP_TOK_TRUNC;
1032         return GSS_S_DEFECTIVE_TOKEN;
1033     }
1034
1035     if (ctx == GSS_C_NO_CONTEXT) {
1036         major = gssEapAllocContext(minor, &ctx);
1037         if (GSS_ERROR(major))
1038             return major;
1039
1040         *context_handle = ctx;
1041     }
1042
1043     GSSEAP_MUTEX_LOCK(&ctx->mutex);
1044
1045     major = gssEapAcceptSecContext(minor,
1046                                    ctx,
1047                                    cred,
1048                                    input_token,
1049                                    input_chan_bindings,
1050                                    src_name,
1051                                    mech_type,
1052                                    output_token,
1053                                    ret_flags,
1054                                    time_rec,
1055                                    delegated_cred_handle);
1056
1057     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
1058
1059     if (GSS_ERROR(major))
1060         gssEapReleaseContext(&tmpMinor, context_handle);
1061
1062     return major;
1063 }