moonshot/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         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     struct rs_error *err;
 422     const char *configStanza = "gss-eap";
 423     OM_uint32 major;
 424
 425     GSSEAP_ASSERT(actx->radContext == NULL);
 426     GSSEAP_ASSERT(actx->radConn == NULL);
 427     GSSEAP_ASSERT(cred != GSS_C_NO_CREDENTIAL);
 428
 429     major = gssEapCreateRadiusContext(minor, cred, &actx->radContext);
 430     if (GSS_ERROR(major))
 431         return major;
 432
 433     if (cred->radiusConfigStanza.value != NULL)
 434         configStanza = (const char *)cred->radiusConfigStanza.value;
 435
 436     if (rs_conn_create(actx->radContext, &actx->radConn, configStanza) != 0) {
 437         err = rs_err_conn_pop(actx->radConn);
 438         return gssEapRadiusMapError(minor, err);
 439     }
 440
 441     if (actx->radServer != NULL) {
 442         if (rs_conn_select_peer(actx->radConn, actx->radServer) != 0) {
 443             err = rs_err_conn_pop(actx->radConn);
 444             return gssEapRadiusMapError(minor, err);
 445         }
 446     }
 447
 448     *minor = 0;
 449     return GSS_S_COMPLETE;
 450 }
 451
 452 /*
 453  * Process a EAP response from the initiator.
 454  */
 455 static OM_uint32
 456 eapGssSmAcceptAuthenticate(OM_uint32 *minor,
 457                            gss_cred_id_t cred,
 458                            gss_ctx_id_t ctx,
 459                            gss_name_t target GSSEAP_UNUSED,
 460                            gss_OID mech GSSEAP_UNUSED,
 461                            OM_uint32 reqFlags GSSEAP_UNUSED,
 462                            OM_uint32 timeReq GSSEAP_UNUSED,
 463                            gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 464                            gss_buffer_t inputToken,
 465                            gss_buffer_t outputToken,
 466                            OM_uint32 *smFlags)
 467 {
 468     OM_uint32 major, tmpMinor;
 469     struct rs_connection *rconn;
 470     struct rs_request *request = NULL;
 471     struct rs_packet *req = NULL, *resp = NULL;
 472     struct radius_packet *frreq, *frresp;
 473
 474     if (ctx->acceptorCtx.radContext == NULL) {
 475         /* May be NULL from an imported partial context */
 476         major = createRadiusHandle(minor, cred, ctx);
 477         if (GSS_ERROR(major))
 478             goto cleanup;
 479     }
 480
 481     if (isIdentityResponseP(inputToken)) {
 482         major = importInitiatorIdentity(minor, ctx, inputToken);
 483         if (GSS_ERROR(major))
 484             return major;
 485     }
 486
 487     rconn = ctx->acceptorCtx.radConn;
 488
 489     if (rs_packet_create_authn_request(rconn, &req, NULL, NULL) != 0) {
 490         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 491         goto cleanup;
 492     }
 493     frreq = rs_packet_frpkt(req);
 494
 495     major = setInitiatorIdentity(minor, ctx, &frreq->vps);
 496     if (GSS_ERROR(major))
 497         goto cleanup;
 498
 499     major = setAcceptorIdentity(minor, ctx, &frreq->vps);
 500     if (GSS_ERROR(major))
 501         goto cleanup;
 502
 503     major = gssEapRadiusAddAvp(minor, &frreq->vps,
 504                                PW_EAP_MESSAGE, 0, inputToken);
 505     if (GSS_ERROR(major))
 506         goto cleanup;
 507
 508     if (ctx->acceptorCtx.state.length != 0) {
 509         major = gssEapRadiusAddAvp(minor, &frreq->vps, PW_STATE, 0,
 510                                    &ctx->acceptorCtx.state);
 511         if (GSS_ERROR(major))
 512             goto cleanup;
 513
 514         gss_release_buffer(&tmpMinor, &ctx->acceptorCtx.state);
 515     }
 516
 517     if (rs_request_create(rconn, &request) != 0) {
 518         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 519         goto cleanup;
 520     }
 521
 522     rs_request_add_reqpkt(request, req);
 523     req = NULL;
 524
 525     if (rs_request_send(request, &resp) != 0) {
 526         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 527         goto cleanup;
 528     }
 529
 530     GSSEAP_ASSERT(resp != NULL);
 531
 532     frresp = rs_packet_frpkt(resp);
 533     switch (frresp->code) {
 534     case PW_ACCESS_CHALLENGE:
 535     case PW_AUTHENTICATION_ACK:
 536         break;
 537     case PW_AUTHENTICATION_REJECT:
 538         *minor = GSSEAP_RADIUS_AUTH_FAILURE;
 539         major = GSS_S_DEFECTIVE_CREDENTIAL;
 540         goto cleanup;
 541         break;
 542     default:
 543         *minor = GSSEAP_UNKNOWN_RADIUS_CODE;
 544         major = GSS_S_FAILURE;
 545         goto cleanup;
 546         break;
 547     }
 548
 549     major = gssEapRadiusGetAvp(minor, frresp->vps, PW_EAP_MESSAGE, 0,
 550                                outputToken, TRUE);
 551     if (major == GSS_S_UNAVAILABLE && frresp->code == PW_ACCESS_CHALLENGE) {
 552         *minor = GSSEAP_MISSING_EAP_REQUEST;
 553         major = GSS_S_DEFECTIVE_TOKEN;
 554         goto cleanup;
 555     } else if (GSS_ERROR(major))
 556         goto cleanup;
 557
 558     if (frresp->code == PW_ACCESS_CHALLENGE) {
 559         major = gssEapRadiusGetAvp(minor, frresp->vps, PW_STATE, 0,
 560                                    &ctx->acceptorCtx.state, TRUE);
 561         if (GSS_ERROR(major) && *minor != GSSEAP_NO_SUCH_ATTR)
 562             goto cleanup;
 563     } else {
 564         ctx->acceptorCtx.vps = frresp->vps;
 565         frresp->vps = NULL;
 566
 567         major = acceptReadyEap(minor, ctx, cred);
 568         if (GSS_ERROR(major))
 569             goto cleanup;
 570
 571         GSSEAP_SM_TRANSITION_NEXT(ctx);
 572     }
 573
 574     major = GSS_S_CONTINUE_NEEDED;
 575     *minor = 0;
 576     *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 577
 578 cleanup:
 579     if (request != NULL)
 580         rs_request_destroy(request);
 581     if (req != NULL)
 582         rs_packet_destroy(req);
 583     if (resp != NULL)
 584         rs_packet_destroy(resp);
 585     if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIATOR_EXTS) {
 586         GSSEAP_ASSERT(major == GSS_S_CONTINUE_NEEDED);
 587
 588         rs_conn_destroy(ctx->acceptorCtx.radConn);
 589         ctx->acceptorCtx.radConn = NULL;
 590     }
 591
 592     return major;
 593 }
 594
 595 static OM_uint32
 596 eapGssSmAcceptGssFlags(OM_uint32 *minor,
 597                        gss_cred_id_t cred GSSEAP_UNUSED,
 598                        gss_ctx_id_t ctx,
 599                        gss_name_t target GSSEAP_UNUSED,
 600                        gss_OID mech GSSEAP_UNUSED,
 601                        OM_uint32 reqFlags GSSEAP_UNUSED,
 602                        OM_uint32 timeReq GSSEAP_UNUSED,
 603                        gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 604                        gss_buffer_t inputToken,
 605                        gss_buffer_t outputToken GSSEAP_UNUSED,
 606                        OM_uint32 *smFlags GSSEAP_UNUSED)
 607 {
 608     unsigned char *p;
 609     OM_uint32 initiatorGssFlags;
 610
 611     GSSEAP_ASSERT((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0);
 612
 613     if (inputToken->length < 4) {
 614         *minor = GSSEAP_TOK_TRUNC;
 615         return GSS_S_DEFECTIVE_TOKEN;
 616     }
 617
 618     /* allow flags to grow for future expansion */
 619     p = (unsigned char *)inputToken->value + inputToken->length - 4;
 620
 621     initiatorGssFlags = load_uint32_be(p);
 622     initiatorGssFlags &= GSSEAP_WIRE_FLAGS_MASK;
 623
 624     ctx->gssFlags |= initiatorGssFlags;
 625
 626     return GSS_S_CONTINUE_NEEDED;
 627 }
 628
 629 static OM_uint32
 630 eapGssSmAcceptGssChannelBindings(OM_uint32 *minor,
 631                                  gss_cred_id_t cred GSSEAP_UNUSED,
 632                                  gss_ctx_id_t ctx,
 633                                  gss_name_t target GSSEAP_UNUSED,
 634                                  gss_OID mech GSSEAP_UNUSED,
 635                                  OM_uint32 reqFlags GSSEAP_UNUSED,
 636                                  OM_uint32 timeReq GSSEAP_UNUSED,
 637                                  gss_channel_bindings_t chanBindings,
 638                                  gss_buffer_t inputToken,
 639                                  gss_buffer_t outputToken GSSEAP_UNUSED,
 640                                  OM_uint32 *smFlags GSSEAP_UNUSED)
 641 {
 642     krb5_error_code code;
 643     krb5_context krbContext;
 644     krb5_data data;
 645     krb5_checksum cksum;
 646     krb5_boolean valid = FALSE;
 647
 648     if (chanBindings == GSS_C_NO_CHANNEL_BINDINGS ||
 649         chanBindings->application_data.length == 0)
 650         return GSS_S_CONTINUE_NEEDED;
 651
 652     GSSEAP_KRB_INIT(&krbContext);
 653
 654     KRB_DATA_INIT(&data);
 655
 656     gssBufferToKrbData(&chanBindings->application_data, &data);
 657
 658     KRB_CHECKSUM_INIT(&cksum, ctx->checksumType, inputToken);
 659
 660     code = krb5_c_verify_checksum(krbContext, &ctx->rfc3961Key,
 661                                   KEY_USAGE_GSSEAP_CHBIND_MIC,
 662                                   &data, &cksum, &valid);
 663     if (code != 0) {
 664         *minor = code;
 665         return GSS_S_FAILURE;
 666     }
 667
 668     if (valid == FALSE) {
 669         *minor = GSSEAP_BINDINGS_MISMATCH;
 670         return GSS_S_BAD_BINDINGS;
 671     }
 672
 673     ctx->flags |= CTX_FLAG_CHANNEL_BINDINGS_VERIFIED;
 674
 675     *minor = 0;
 676     return GSS_S_CONTINUE_NEEDED;
 677 }
 678
 679 static OM_uint32
 680 eapGssSmAcceptInitiatorMIC(OM_uint32 *minor,
 681                            gss_cred_id_t cred GSSEAP_UNUSED,
 682                            gss_ctx_id_t ctx,
 683                            gss_name_t target GSSEAP_UNUSED,
 684                            gss_OID mech GSSEAP_UNUSED,
 685                            OM_uint32 reqFlags GSSEAP_UNUSED,
 686                            OM_uint32 timeReq GSSEAP_UNUSED,
 687                            gss_channel_bindings_t chanBindings,
 688                            gss_buffer_t inputToken,
 689                            gss_buffer_t outputToken GSSEAP_UNUSED,
 690                            OM_uint32 *smFlags GSSEAP_UNUSED)
 691 {
 692     OM_uint32 major;
 693
 694     /*
 695      * The channel binding token is optional, however if the caller indicated
 696      * bindings we must raise an error if it was absent.
 697      *
 698      * In the future, we might use a context option to allow the caller to
 699      * indicate that missing bindings are acceptable.
 700      */
 701     if (chanBindings != NULL &&
 702         chanBindings->application_data.length != 0 &&
 703         (ctx->flags & CTX_FLAG_CHANNEL_BINDINGS_VERIFIED) == 0) {
 704         *minor = GSSEAP_MISSING_BINDINGS;
 705         return GSS_S_BAD_BINDINGS;
 706     }
 707
 708     major = gssEapVerifyTokenMIC(minor, ctx, inputToken);
 709     if (GSS_ERROR(major))
 710         return major;
 711
 712     GSSEAP_SM_TRANSITION_NEXT(ctx);
 713
 714     *minor = 0;
 715     return GSS_S_CONTINUE_NEEDED;
 716 }
 717
 718 #ifdef GSSEAP_ENABLE_REAUTH
 719 static OM_uint32
 720 eapGssSmAcceptReauthCreds(OM_uint32 *minor,
 721                           gss_cred_id_t cred,
 722                           gss_ctx_id_t ctx,
 723                           gss_name_t target GSSEAP_UNUSED,
 724                           gss_OID mech GSSEAP_UNUSED,
 725                           OM_uint32 reqFlags GSSEAP_UNUSED,
 726                           OM_uint32 timeReq GSSEAP_UNUSED,
 727                           gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 728                           gss_buffer_t inputToken GSSEAP_UNUSED,
 729                           gss_buffer_t outputToken,
 730                           OM_uint32 *smFlags GSSEAP_UNUSED)
 731 {
 732     OM_uint32 major;
 733
 734     /*
 735      * If we're built with fast reauthentication enabled, then
 736      * fabricate a ticket from the initiator to ourselves.
 737      */
 738     major = gssEapMakeReauthCreds(minor, ctx, cred, outputToken);
 739     if (major == GSS_S_UNAVAILABLE)
 740         major = GSS_S_COMPLETE;
 741     if (major == GSS_S_COMPLETE)
 742         major = GSS_S_CONTINUE_NEEDED;
 743
 744     return major;
 745 }
 746 #endif
 747
 748 static OM_uint32
 749 eapGssSmAcceptAcceptorMIC(OM_uint32 *minor,
 750                           gss_cred_id_t cred GSSEAP_UNUSED,
 751                           gss_ctx_id_t ctx,
 752                           gss_name_t target GSSEAP_UNUSED,
 753                           gss_OID mech GSSEAP_UNUSED,
 754                           OM_uint32 reqFlags GSSEAP_UNUSED,
 755                           OM_uint32 timeReq GSSEAP_UNUSED,
 756                           gss_channel_bindings_t chanBindings GSSEAP_UNUSED,
 757                           gss_buffer_t inputToken GSSEAP_UNUSED,
 758                           gss_buffer_t outputToken,
 759                           OM_uint32 *smFlags)
 760 {
 761     OM_uint32 major;
 762
 763     major = gssEapMakeTokenMIC(minor, ctx, outputToken);
 764     if (GSS_ERROR(major))
 765         return major;
 766
 767     GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
 768
 769     *minor = 0;
 770     *smFlags |= SM_FLAG_OUTPUT_TOKEN_CRITICAL;
 771
 772     return GSS_S_COMPLETE;
 773 }
 774
 775 static struct gss_eap_sm eapGssAcceptorSm[] = {
 776     {
 777         ITOK_TYPE_ACCEPTOR_NAME_REQ,
 778         ITOK_TYPE_ACCEPTOR_NAME_RESP,
 779         GSSEAP_STATE_INITIAL,
 780         0,
 781         eapGssSmAcceptAcceptorName
 782     },
 783 #ifdef GSSEAP_DEBUG
 784     {
 785         ITOK_TYPE_VENDOR_INFO,
 786         ITOK_TYPE_NONE,
 787         GSSEAP_STATE_INITIAL,
 788         0,
 789         eapGssSmAcceptVendorInfo,
 790     },
 791 #endif
 792 #ifdef GSSEAP_ENABLE_REAUTH
 793     {
 794         ITOK_TYPE_REAUTH_REQ,
 795         ITOK_TYPE_REAUTH_RESP,
 796         GSSEAP_STATE_INITIAL,
 797         0,
 798         eapGssSmAcceptGssReauth,
 799     },
 800 #endif
 801     {
 802         ITOK_TYPE_NONE,
 803         ITOK_TYPE_EAP_REQ,
 804         GSSEAP_STATE_INITIAL,
 805         SM_ITOK_FLAG_REQUIRED,
 806         eapGssSmAcceptIdentity,
 807     },
 808     {
 809         ITOK_TYPE_EAP_RESP,
 810         ITOK_TYPE_EAP_REQ,
 811         GSSEAP_STATE_AUTHENTICATE,
 812         SM_ITOK_FLAG_REQUIRED,
 813         eapGssSmAcceptAuthenticate
 814     },
 815     {
 816         ITOK_TYPE_GSS_FLAGS,
 817         ITOK_TYPE_NONE,
 818         GSSEAP_STATE_INITIATOR_EXTS,
 819         0,
 820         eapGssSmAcceptGssFlags
 821     },
 822     {
 823         ITOK_TYPE_GSS_CHANNEL_BINDINGS,
 824         ITOK_TYPE_NONE,
 825         GSSEAP_STATE_INITIATOR_EXTS,
 826         0,
 827         eapGssSmAcceptGssChannelBindings,
 828     },
 829     {
 830         ITOK_TYPE_INITIATOR_MIC,
 831         ITOK_TYPE_NONE,
 832         GSSEAP_STATE_INITIATOR_EXTS,
 833         SM_ITOK_FLAG_REQUIRED,
 834         eapGssSmAcceptInitiatorMIC,
 835     },
 836 #ifdef GSSEAP_ENABLE_REAUTH
 837     {
 838         ITOK_TYPE_NONE,
 839         ITOK_TYPE_REAUTH_CREDS,
 840         GSSEAP_STATE_ACCEPTOR_EXTS,
 841         0,
 842         eapGssSmAcceptReauthCreds,
 843     },
 844 #endif
 845     {
 846         ITOK_TYPE_NONE,
 847         ITOK_TYPE_ACCEPTOR_MIC,
 848         GSSEAP_STATE_ACCEPTOR_EXTS,
 849         0,
 850         eapGssSmAcceptAcceptorMIC
 851     },
 852 };
 853
 854 OM_uint32
 855 gssEapAcceptSecContext(OM_uint32 *minor,
 856                        gss_ctx_id_t ctx,
 857                        gss_cred_id_t cred,
 858                        gss_buffer_t input_token,
 859                        gss_channel_bindings_t input_chan_bindings,
 860                        gss_name_t *src_name,
 861                        gss_OID *mech_type,
 862                        gss_buffer_t output_token,
 863                        OM_uint32 *ret_flags,
 864                        OM_uint32 *time_rec,
 865                        gss_cred_id_t *delegated_cred_handle)
 866 {
 867     OM_uint32 major, tmpMinor;
 868
 869     if (cred == GSS_C_NO_CREDENTIAL) {
 870         if (ctx->cred == GSS_C_NO_CREDENTIAL) {
 871             major = gssEapAcquireCred(minor,
 872                                       GSS_C_NO_NAME,
 873                                       GSS_C_INDEFINITE,
 874                                       GSS_C_NO_OID_SET,
 875                                       GSS_C_ACCEPT,
 876                                       &ctx->cred,
 877                                       NULL,
 878                                       NULL);
 879             if (GSS_ERROR(major))
 880                 goto cleanup;
 881         }
 882
 883         cred = ctx->cred;
 884     }
 885
 886     /*
 887      * Previously we acquired the credential mutex here, but it should not be
 888      * necessary as the acceptor does not access any mutable elements of the
 889      * credential handle.
 890      */
 891
 892     /*
 893      * Calling gssEapInquireCred() forces the default acceptor credential name
 894      * to be resolved.
 895      */
 896     major = gssEapInquireCred(minor, cred, &ctx->acceptorName, NULL, NULL, NULL);
 897     if (GSS_ERROR(major))
 898         goto cleanup;
 899
 900     major = gssEapSmStep(minor,
 901                          cred,
 902                          ctx,
 903                          GSS_C_NO_NAME,
 904                          GSS_C_NO_OID,
 905                          0,
 906                          GSS_C_INDEFINITE,
 907                          input_chan_bindings,
 908                          input_token,
 909                          output_token,
 910                          eapGssAcceptorSm,
 911                          sizeof(eapGssAcceptorSm) / sizeof(eapGssAcceptorSm[0]));
 912     if (GSS_ERROR(major))
 913         goto cleanup;
 914
 915     if (mech_type != NULL) {
 916         OM_uint32 tmpMajor;
 917
 918         tmpMajor = gssEapCanonicalizeOid(&tmpMinor, ctx->mechanismUsed, 0, mech_type);
 919         if (GSS_ERROR(tmpMajor)) {
 920             major = tmpMajor;
 921             *minor = tmpMinor;
 922             goto cleanup;
 923         }
 924     }
 925     if (ret_flags != NULL)
 926         *ret_flags = ctx->gssFlags;
 927     if (delegated_cred_handle != NULL)
 928         *delegated_cred_handle = GSS_C_NO_CREDENTIAL;
 929
 930     if (major == GSS_S_COMPLETE) {
 931         if (src_name != NULL && ctx->initiatorName != GSS_C_NO_NAME) {
 932             major = gssEapDuplicateName(&tmpMinor, ctx->initiatorName, src_name);
 933             if (GSS_ERROR(major))
 934                 goto cleanup;
 935         }
 936         if (time_rec != NULL) {
 937             major = gssEapContextTime(&tmpMinor, ctx, time_rec);
 938             if (GSS_ERROR(major))
 939                 goto cleanup;
 940         }
 941     }
 942
 943     GSSEAP_ASSERT(CTX_IS_ESTABLISHED(ctx) || major == GSS_S_CONTINUE_NEEDED);
 944
 945 cleanup:
 946     return major;
 947 }
 948
 949 #ifdef GSSEAP_ENABLE_REAUTH
 950 static OM_uint32
 951 acceptReadyKrb(OM_uint32 *minor,
 952                gss_ctx_id_t ctx,
 953                gss_cred_id_t cred,
 954                const gss_name_t initiator,
 955                const gss_OID mech,
 956                OM_uint32 timeRec)
 957 {
 958     OM_uint32 major;
 959
 960     major = gssEapGlueToMechName(minor, ctx, initiator, &ctx->initiatorName);
 961     if (GSS_ERROR(major))
 962         return major;
 963
 964     major = gssEapReauthComplete(minor, ctx, cred, mech, timeRec);
 965     if (GSS_ERROR(major))
 966         return major;
 967
 968     *minor = 0;
 969     return GSS_S_COMPLETE;
 970 }
 971
 972 static OM_uint32
 973 eapGssSmAcceptGssReauth(OM_uint32 *minor,
 974                         gss_cred_id_t cred,
 975                         gss_ctx_id_t ctx,
 976                         gss_name_t target GSSEAP_UNUSED,
 977                         gss_OID mech,
 978                         OM_uint32 reqFlags GSSEAP_UNUSED,
 979                         OM_uint32 timeReq GSSEAP_UNUSED,
 980                         gss_channel_bindings_t chanBindings,
 981                         gss_buffer_t inputToken,
 982                         gss_buffer_t outputToken,
 983                         OM_uint32 *smFlags)
 984 {
 985     OM_uint32 major, tmpMinor;
 986     gss_name_t krbInitiator = GSS_C_NO_NAME;
 987     OM_uint32 gssFlags, timeRec = GSS_C_INDEFINITE;
 988
 989     /*
 990      * If we're built with fast reauthentication support, it's valid
 991      * for an initiator to send a GSS reauthentication token as its
 992      * initial context token, causing us to short-circuit the state
 993      * machine and process Kerberos GSS messages instead.
 994      */
 995
 996     ctx->flags |= CTX_FLAG_KRB_REAUTH;
 997
 998     major = gssAcceptSecContext(minor,
 999                                 &ctx->reauthCtx,
1000                                 cred->reauthCred,
1001                                 inputToken,
1002                                 chanBindings,
1003                                 &krbInitiator,
1004                                 &mech,
1005                                 outputToken,
1006                                 &gssFlags,
1007                                 &timeRec,
1008                                 NULL);
1009     if (major == GSS_S_COMPLETE) {
1010         major = acceptReadyKrb(minor, ctx, cred,
1011                                krbInitiator, mech, timeRec);
1012         if (major == GSS_S_COMPLETE) {
1013             GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED);
1014         }
1015         ctx->gssFlags = gssFlags;
1016     } else if (GSS_ERROR(major) &&
1017         (*smFlags & SM_FLAG_INPUT_TOKEN_CRITICAL) == 0) {
1018         /* pretend reauthentication attempt never happened */
1019         gssDeleteSecContext(&tmpMinor, &ctx->reauthCtx, GSS_C_NO_BUFFER);
1020         ctx->flags &= ~(CTX_FLAG_KRB_REAUTH);
1021         GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_INITIAL);
1022         major = GSS_S_CONTINUE_NEEDED;
1023     }
1024
1025     gssReleaseName(&tmpMinor, &krbInitiator);
1026
1027     return major;
1028 }
1029 #endif /* GSSEAP_ENABLE_REAUTH */
1030
1031 OM_uint32 GSSAPI_CALLCONV
1032 gss_accept_sec_context(OM_uint32 *minor,
1033                        gss_ctx_id_t *context_handle,
1034                        gss_cred_id_t cred,
1035                        gss_buffer_t input_token,
1036                        gss_channel_bindings_t input_chan_bindings,
1037                        gss_name_t *src_name,
1038                        gss_OID *mech_type,
1039                        gss_buffer_t output_token,
1040                        OM_uint32 *ret_flags,
1041                        OM_uint32 *time_rec,
1042                        gss_cred_id_t *delegated_cred_handle)
1043 {
1044     OM_uint32 major, tmpMinor;
1045     gss_ctx_id_t ctx = *context_handle;
1046
1047     *minor = 0;
1048
1049     output_token->length = 0;
1050     output_token->value = NULL;
1051
1052     if (src_name != NULL)
1053         *src_name = GSS_C_NO_NAME;
1054
1055     if (input_token == GSS_C_NO_BUFFER || input_token->length == 0) {
1056         *minor = GSSEAP_TOK_TRUNC;
1057         return GSS_S_DEFECTIVE_TOKEN;
1058     }
1059
1060     if (ctx == GSS_C_NO_CONTEXT) {
1061         major = gssEapAllocContext(minor, &ctx);
1062         if (GSS_ERROR(major))
1063             return major;
1064
1065         *context_handle = ctx;
1066     }
1067
1068     GSSEAP_MUTEX_LOCK(&ctx->mutex);
1069
1070     major = gssEapAcceptSecContext(minor,
1071                                    ctx,
1072                                    cred,
1073                                    input_token,
1074                                    input_chan_bindings,
1075                                    src_name,
1076                                    mech_type,
1077                                    output_token,
1078                                    ret_flags,
1079                                    time_rec,
1080                                    delegated_cred_handle);
1081
1082     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
1083
1084     if (GSS_ERROR(major))
1085         gssEapReleaseContext(&tmpMinor, context_handle);
1086
1087     return major;
1088 }