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_ctx_id_t ctx,
  44                         gss_cred_id_t cred,
  45                         gss_buffer_t inputToken,
  46                         gss_channel_bindings_t chanBindings,
  47                         gss_buffer_t outputToken);
  48 #endif
  49
  50 /*
  51  * Mark an acceptor context as ready for cryptographic operations
  52  */
  53 static OM_uint32
  54 acceptReadyEap(OM_uint32 *minor, gss_ctx_id_t ctx, gss_cred_id_t cred)
  55 {
  56     OM_uint32 major, tmpMinor;
  57     VALUE_PAIR *vp;
  58     gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
  59
  60     /* Cache encryption type derived from selected mechanism OID */
  61     major = gssEapOidToEnctype(minor, ctx->mechanismUsed,
  62                                &ctx->encryptionType);
  63     if (GSS_ERROR(major))
  64         return major;
  65
  66     gssEapReleaseName(&tmpMinor, &ctx->initiatorName);
  67
  68     major = gssEapRadiusGetRawAvp(minor, ctx->acceptorCtx.vps,
  69                                   PW_USER_NAME, 0, &vp);
  70     if (major == GSS_S_COMPLETE) {
  71         nameBuf.length = vp->length;
  72         nameBuf.value = vp->vp_strvalue;
  73     } else {
  74         ctx->gssFlags |= GSS_C_ANON_FLAG;
  75     }
  76
  77     major = gssEapImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
  78                              &ctx->initiatorName);
  79     if (GSS_ERROR(major))
  80         return major;
  81
  82     major = gssEapRadiusGetRawAvp(minor, ctx->acceptorCtx.vps,
  83                                   PW_MS_MPPE_SEND_KEY, VENDORPEC_MS, &vp);
  84     if (GSS_ERROR(major)) {
  85         *minor = GSSEAP_KEY_UNAVAILABLE;
  86         return GSS_S_UNAVAILABLE;
  87     }
  88
  89     major = gssEapDeriveRfc3961Key(minor,
  90                                    vp->vp_octets,
  91                                    vp->length,
  92                                    ctx->encryptionType,
  93                                    &ctx->rfc3961Key);
  94     if (GSS_ERROR(major))
  95         return major;
  96
  97     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
  98                                        &ctx->checksumType);
  99     if (GSS_ERROR(major))
 100         return major;
 101
 102     major = sequenceInit(minor,
 103                          &ctx->seqState, ctx->recvSeq,
 104                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 105                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 106                          TRUE);
 107     if (GSS_ERROR(major))
 108         return major;
 109
 110     major = gssEapCreateAttrContext(minor, cred, ctx,
 111                                     &ctx->initiatorName->attrCtx,
 112                                     &ctx->expiryTime);
 113     if (GSS_ERROR(major))
 114         return major;
 115
 116     *minor = 0;
 117     return GSS_S_COMPLETE;
 118 }
 119
 120 /*
 121  * Emit a identity EAP request to force the initiator (peer) to identify
 122  * itself.
 123  */
 124 static OM_uint32
 125 eapGssSmAcceptIdentity(OM_uint32 *minor,
 126                        gss_ctx_id_t ctx,
 127                        gss_cred_id_t cred,
 128                        gss_buffer_t inputToken,
 129                        gss_channel_bindings_t chanBindings,
 130                        gss_buffer_t outputToken)
 131 {
 132     OM_uint32 major;
 133     union {
 134         struct eap_hdr pdu;
 135         unsigned char data[5];
 136     } pkt;
 137     gss_buffer_desc pktBuffer;
 138
 139     if (inputToken != GSS_C_NO_BUFFER && inputToken->length != 0) {
 140         *minor = GSSEAP_WRONG_SIZE;
 141         return GSS_S_DEFECTIVE_TOKEN;
 142     }
 143
 144     assert(ctx->acceptorName == GSS_C_NO_NAME);
 145
 146     if (cred->name != GSS_C_NO_NAME) {
 147         major = gssEapDuplicateName(minor, cred->name, &ctx->acceptorName);
 148         if (GSS_ERROR(major))
 149             return major;
 150     }
 151
 152     pkt.pdu.code = EAP_CODE_REQUEST;
 153     pkt.pdu.identifier = 0;
 154     pkt.pdu.length = htons(sizeof(pkt.data));
 155     pkt.data[4] = EAP_TYPE_IDENTITY;
 156
 157     pktBuffer.length = sizeof(pkt.data);
 158     pktBuffer.value = pkt.data;
 159
 160     major = duplicateBuffer(minor, &pktBuffer, outputToken);
 161     if (GSS_ERROR(major))
 162         return major;
 163
 164     ctx->state = GSSEAP_STATE_AUTHENTICATE;
 165
 166     *minor = 0;
 167     return GSS_S_CONTINUE_NEEDED;
 168 }
 169
 170 /*
 171  * Returns TRUE if the input token contains an EAP identity response.
 172  */
 173 static int
 174 isIdentityResponseP(gss_buffer_t inputToken)
 175 {
 176     struct wpabuf respData;
 177
 178     wpabuf_set(&respData, inputToken->value, inputToken->length);
 179
 180     return (eap_get_type(&respData) == EAP_TYPE_IDENTITY);
 181 }
 182
 183 /*
 184  * Pass the asserted initiator identity to the authentication server.
 185  */
 186 static OM_uint32
 187 setInitiatorIdentity(OM_uint32 *minor,
 188                      gss_buffer_t inputToken,
 189                      VALUE_PAIR **vps)
 190 {
 191     struct wpabuf respData;
 192     const unsigned char *pos;
 193     size_t len;
 194     gss_buffer_desc nameBuf;
 195
 196     wpabuf_set(&respData, inputToken->value, inputToken->length);
 197
 198     pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY,
 199                            &respData, &len);
 200     if (pos == NULL) {
 201         *minor = GSSEAP_PEER_BAD_MESSAGE;
 202         return GSS_S_DEFECTIVE_TOKEN;
 203     }
 204
 205     nameBuf.value = (void *)pos;
 206     nameBuf.length = len;
 207
 208     return gssEapRadiusAddAvp(minor, vps, PW_USER_NAME, 0, &nameBuf);
 209 }
 210
 211 /*
 212  * Pass the asserted acceptor identity to the authentication server.
 213  */
 214 static OM_uint32
 215 setAcceptorIdentity(OM_uint32 *minor,
 216                     gss_ctx_id_t ctx,
 217                     VALUE_PAIR **vps)
 218 {
 219     OM_uint32 major;
 220     gss_buffer_desc nameBuf;
 221     krb5_context krbContext = NULL;
 222     krb5_principal krbPrinc;
 223     struct rs_context *rc = ctx->acceptorCtx.radContext;
 224
 225     assert(rc != NULL);
 226
 227     if (ctx->acceptorName == GSS_C_NO_NAME) {
 228         *minor = 0;
 229         return GSS_S_COMPLETE;
 230     }
 231
 232     if ((ctx->acceptorName->flags & NAME_FLAG_SERVICE) == 0) {
 233         *minor = GSSEAP_BAD_SERVICE_NAME;
 234         return GSS_S_BAD_NAME;
 235     }
 236
 237     GSSEAP_KRB_INIT(&krbContext);
 238
 239     krbPrinc = ctx->acceptorName->krbPrincipal;
 240     assert(krbPrinc != NULL);
 241     assert(KRB_PRINC_LENGTH(krbPrinc) >= 2);
 242
 243     /* Acceptor-Service-Name */
 244     krbPrincComponentToGssBuffer(krbPrinc, 0, &nameBuf);
 245
 246     major = gssEapRadiusAddAvp(minor, vps,
 247                                PW_GSS_ACCEPTOR_SERVICE_NAME,
 248                                VENDORPEC_UKERNA,
 249                                &nameBuf);
 250     if (GSS_ERROR(major))
 251         return major;
 252
 253     /* Acceptor-Host-Name */
 254     krbPrincComponentToGssBuffer(krbPrinc, 1, &nameBuf);
 255
 256     major = gssEapRadiusAddAvp(minor, vps,
 257                                PW_GSS_ACCEPTOR_HOST_NAME,
 258                                VENDORPEC_UKERNA,
 259                                &nameBuf);
 260     if (GSS_ERROR(major))
 261         return major;
 262
 263     if (KRB_PRINC_LENGTH(krbPrinc) > 2) {
 264         /* Acceptor-Service-Specific */
 265         krb5_principal_data ssiPrinc = *krbPrinc;
 266         char *ssi;
 267
 268         KRB_PRINC_LENGTH(&ssiPrinc) -= 2;
 269         KRB_PRINC_NAME(&ssiPrinc) += 2;
 270
 271         *minor = krb5_unparse_name_flags(krbContext, &ssiPrinc,
 272                                          KRB5_PRINCIPAL_UNPARSE_NO_REALM, &ssi);
 273         if (*minor != 0)
 274             return GSS_S_FAILURE;
 275
 276         nameBuf.value = ssi;
 277         nameBuf.length = strlen(ssi);
 278
 279         major = gssEapRadiusAddAvp(minor, vps,
 280                                    PW_GSS_ACCEPTOR_SERVICE_SPECIFIC,
 281                                    VENDORPEC_UKERNA,
 282                                    &nameBuf);
 283
 284         if (GSS_ERROR(major)) {
 285             krb5_free_unparsed_name(krbContext, ssi);
 286             return major;
 287         }
 288         krb5_free_unparsed_name(krbContext, ssi);
 289     }
 290
 291     krbPrincRealmToGssBuffer(krbPrinc, &nameBuf);
 292     if (nameBuf.length != 0) {
 293         /* Acceptor-Realm-Name */
 294         major = gssEapRadiusAddAvp(minor, vps,
 295                                    PW_GSS_ACCEPTOR_REALM_NAME,
 296                                    VENDORPEC_UKERNA,
 297                                    &nameBuf);
 298         if (GSS_ERROR(major))
 299             return major;
 300     }
 301
 302     *minor = 0;
 303     return GSS_S_COMPLETE;
 304 }
 305
 306 /*
 307  * Allocate a RadSec handle
 308  */
 309 static OM_uint32
 310 createRadiusHandle(OM_uint32 *minor,
 311                    gss_cred_id_t cred,
 312                    gss_ctx_id_t ctx)
 313 {
 314     struct gss_eap_acceptor_ctx *actx = &ctx->acceptorCtx;
 315     const char *configFile = RS_CONFIG_FILE;
 316     const char *configStanza = "gss-eap";
 317     struct rs_alloc_scheme ralloc;
 318     struct rs_error *err;
 319
 320     assert(actx->radContext == NULL);
 321     assert(actx->radConn == NULL);
 322
 323     if (rs_context_create(&actx->radContext, RS_DICT_FILE) != 0) {
 324         *minor = GSSEAP_RADSEC_CONTEXT_FAILURE;
 325         return GSS_S_FAILURE;
 326     }
 327
 328     if (cred->radiusConfigFile != NULL)
 329         configFile = cred->radiusConfigFile;
 330     if (cred->radiusConfigStanza != NULL)
 331         configStanza = cred->radiusConfigStanza;
 332
 333     ralloc.calloc  = GSSEAP_CALLOC;
 334     ralloc.malloc  = GSSEAP_MALLOC;
 335     ralloc.free    = GSSEAP_FREE;
 336     ralloc.realloc = GSSEAP_REALLOC;
 337
 338     rs_context_set_alloc_scheme(actx->radContext, &ralloc);
 339
 340     if (rs_context_read_config(actx->radContext, configFile) != 0) {
 341         err = rs_err_ctx_pop(actx->radContext);
 342         goto fail;
 343     }
 344
 345     if (rs_conn_create(actx->radContext, &actx->radConn, configStanza) != 0) {
 346         err = rs_err_conn_pop(actx->radConn);
 347         goto fail;
 348     }
 349
 350     if (actx->radServer != NULL) {
 351         if (rs_conn_select_peer(actx->radConn, actx->radServer) != 0) {
 352             err = rs_err_conn_pop(actx->radConn);
 353             goto fail;
 354         }
 355     }
 356
 357     *minor = 0;
 358     return GSS_S_COMPLETE;
 359
 360 fail:
 361     return gssEapRadiusMapError(minor, err);
 362 }
 363
 364 /*
 365  * Process a EAP response from the initiator.
 366  */
 367 static OM_uint32
 368 eapGssSmAcceptAuthenticate(OM_uint32 *minor,
 369                            gss_ctx_id_t ctx,
 370                            gss_cred_id_t cred,
 371                            gss_buffer_t inputToken,
 372                            gss_channel_bindings_t chanBindings,
 373                            gss_buffer_t outputToken)
 374 {
 375     OM_uint32 major, tmpMinor;
 376     struct rs_connection *rconn;
 377     struct rs_request *request = NULL;
 378     struct rs_packet *req = NULL, *resp = NULL;
 379     struct radius_packet *frreq, *frresp;
 380     int isIdentityResponse = isIdentityResponseP(inputToken);
 381
 382     if (ctx->acceptorCtx.radContext == NULL) {
 383         /* May be NULL from an imported partial context */
 384         major = createRadiusHandle(minor, cred, ctx);
 385         if (GSS_ERROR(major))
 386             goto cleanup;
 387     }
 388
 389     rconn = ctx->acceptorCtx.radConn;
 390
 391     if (rs_packet_create_authn_request(rconn, &req, NULL, NULL) != 0) {
 392         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 393         goto cleanup;
 394     }
 395     frreq = rs_packet_frpkt(req);
 396
 397     if (isIdentityResponse) {
 398         major = setInitiatorIdentity(minor, inputToken, &frreq->vps);
 399         if (GSS_ERROR(major))
 400             goto cleanup;
 401
 402         major = setAcceptorIdentity(minor, ctx, &frreq->vps);
 403         if (GSS_ERROR(major))
 404             goto cleanup;
 405     }
 406
 407     major = gssEapRadiusAddAvp(minor, &frreq->vps,
 408                                PW_EAP_MESSAGE, 0, inputToken);
 409     if (GSS_ERROR(major))
 410         goto cleanup;
 411
 412     if (ctx->acceptorCtx.state.length != 0) {
 413         major = gssEapRadiusAddAvp(minor, &frreq->vps, PW_STATE, 0,
 414                                    &ctx->acceptorCtx.state);
 415         if (GSS_ERROR(major))
 416             goto cleanup;
 417
 418         gss_release_buffer(&tmpMinor, &ctx->acceptorCtx.state);
 419     }
 420
 421     if (rs_request_create(rconn, &request) != 0) {
 422         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 423         goto cleanup;
 424     }
 425
 426     rs_request_add_reqpkt(request, req);
 427     req = NULL;
 428
 429     if (rs_request_send(request, &resp) != 0) {
 430         major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
 431         goto cleanup;
 432     }
 433
 434     assert(resp != NULL);
 435
 436     frresp = rs_packet_frpkt(resp);
 437     switch (frresp->code) {
 438     case PW_AUTHENTICATION_ACK:
 439     case PW_ACCESS_CHALLENGE:
 440         major = GSS_S_CONTINUE_NEEDED;
 441         break;
 442     case PW_AUTHENTICATION_REJECT:
 443         *minor = GSSEAP_RADIUS_AUTH_FAILURE;
 444         major = GSS_S_DEFECTIVE_CREDENTIAL;
 445         goto cleanup;
 446         break;
 447     default:
 448         *minor = GSSEAP_UNKNOWN_RADIUS_CODE;
 449         major = GSS_S_FAILURE;
 450         goto cleanup;
 451         break;
 452     }
 453
 454     major = gssEapRadiusGetAvp(minor, frresp->vps, PW_EAP_MESSAGE, 0,
 455                                outputToken, TRUE);
 456     if (major == GSS_S_UNAVAILABLE && frresp->code == PW_ACCESS_CHALLENGE) {
 457         *minor = GSSEAP_MISSING_EAP_REQUEST;
 458         major = GSS_S_DEFECTIVE_TOKEN;
 459         goto cleanup;
 460     } else if (GSS_ERROR(major))
 461         goto cleanup;
 462
 463     if (frresp->code == PW_ACCESS_CHALLENGE) {
 464         major = gssEapRadiusGetAvp(minor, frresp->vps, PW_STATE, 0,
 465                                    &ctx->acceptorCtx.state, TRUE);
 466         if (GSS_ERROR(major) && *minor != GSSEAP_NO_SUCH_ATTR)
 467             goto cleanup;
 468     } else {
 469         ctx->acceptorCtx.vps = frresp->vps;
 470         frresp->vps = NULL;
 471
 472         rs_conn_destroy(ctx->acceptorCtx.radConn);
 473         ctx->acceptorCtx.radConn = NULL;
 474
 475         major = acceptReadyEap(minor, ctx, cred);
 476         if (GSS_ERROR(major))
 477             goto cleanup;
 478
 479         ctx->state = GSSEAP_STATE_EXTENSIONS_REQ;
 480     }
 481
 482     *minor = 0;
 483     major = GSS_S_CONTINUE_NEEDED;
 484
 485 cleanup:
 486     if (request != NULL)
 487         rs_request_destroy(request);
 488     if (req != NULL)
 489         rs_packet_destroy(req);
 490
 491     return major;
 492 }
 493
 494 static OM_uint32
 495 eapGssSmAcceptExtensionsReq(OM_uint32 *minor,
 496                             gss_ctx_id_t ctx,
 497                             gss_cred_id_t cred,
 498                             gss_buffer_t inputToken,
 499                             gss_channel_bindings_t chanBindings,
 500                             gss_buffer_t outputToken)
 501 {
 502     OM_uint32 major;
 503
 504     major = gssEapVerifyExtensions(minor, cred, ctx, chanBindings, inputToken);
 505     if (GSS_ERROR(major))
 506         return major;
 507
 508     outputToken->length = 0;
 509     outputToken->value = NULL;
 510
 511     ctx->state = GSSEAP_STATE_EXTENSIONS_RESP;
 512
 513     *minor = 0;
 514     return GSS_S_CONTINUE_NEEDED;
 515 }
 516
 517 static OM_uint32
 518 eapGssSmAcceptExtensionsResp(OM_uint32 *minor,
 519                              gss_ctx_id_t ctx,
 520                              gss_cred_id_t cred,
 521                              gss_buffer_t inputToken,
 522                              gss_channel_bindings_t chanBindings,
 523                              gss_buffer_t outputToken)
 524 {
 525     OM_uint32 major;
 526
 527     major = gssEapMakeExtensions(minor, cred, ctx, chanBindings, outputToken);
 528     if (GSS_ERROR(major))
 529         return major;
 530
 531     ctx->state = GSSEAP_STATE_ESTABLISHED;
 532
 533     *minor = 0;
 534     return GSS_S_COMPLETE;
 535 }
 536
 537 static OM_uint32
 538 eapGssSmAcceptEstablished(OM_uint32 *minor,
 539                           gss_ctx_id_t ctx,
 540                           gss_cred_id_t cred,
 541                           gss_buffer_t inputToken,
 542                           gss_channel_bindings_t chanBindings,
 543                           gss_buffer_t outputToken)
 544 {
 545     /* Called with already established context */
 546     *minor = GSSEAP_CONTEXT_ESTABLISHED;
 547     return GSS_S_BAD_STATUS;
 548 }
 549
 550 static OM_uint32
 551 makeErrorToken(OM_uint32 *minor,
 552                OM_uint32 majorStatus,
 553                OM_uint32 minorStatus,
 554                gss_buffer_t outputToken)
 555 {
 556     unsigned char errorData[8];
 557     gss_buffer_desc errorBuffer;
 558
 559     assert(GSS_ERROR(majorStatus));
 560
 561     /*
 562      * Only return error codes that the initiator could have caused,
 563      * to avoid information leakage.
 564      */
 565     if (IS_RADIUS_ERROR(minorStatus)) {
 566         /* Squash RADIUS error codes */
 567         minorStatus = GSSEAP_RADIUS_PROT_FAILURE;
 568     } else if (!IS_WIRE_ERROR(minorStatus)) {
 569         /* Don't return non-wire error codes */
 570         return GSS_S_COMPLETE;
 571     }
 572
 573     minorStatus -= ERROR_TABLE_BASE_eapg;
 574
 575     store_uint32_be(majorStatus, &errorData[0]);
 576     store_uint32_be(minorStatus, &errorData[4]);
 577
 578     errorBuffer.length = sizeof(errorData);
 579     errorBuffer.value = errorData;
 580
 581     return duplicateBuffer(minor, &errorBuffer, outputToken);
 582 }
 583
 584 static struct gss_eap_acceptor_sm {
 585     enum gss_eap_token_type inputTokenType;
 586     enum gss_eap_token_type outputTokenType;
 587     OM_uint32 (*processToken)(OM_uint32 *,
 588                               gss_ctx_id_t,
 589                               gss_cred_id_t,
 590                               gss_buffer_t,
 591                               gss_channel_bindings_t,
 592                               gss_buffer_t);
 593 } eapGssAcceptorSm[] = {
 594     { TOK_TYPE_EAP_RESP,    TOK_TYPE_EAP_REQ,       eapGssSmAcceptIdentity           },
 595     { TOK_TYPE_EAP_RESP,    TOK_TYPE_EAP_REQ,       eapGssSmAcceptAuthenticate       },
 596     { TOK_TYPE_EXT_REQ,     TOK_TYPE_NONE,          eapGssSmAcceptExtensionsReq      },
 597     { TOK_TYPE_NONE,        TOK_TYPE_EXT_RESP,      eapGssSmAcceptExtensionsResp     },
 598     { TOK_TYPE_NONE,        TOK_TYPE_NONE,          eapGssSmAcceptEstablished        },
 599     { TOK_TYPE_NONE,        TOK_TYPE_CONTEXT_ERR,   NULL                             },
 600 #ifdef GSSEAP_ENABLE_REAUTH
 601     { TOK_TYPE_GSS_REAUTH,  TOK_TYPE_GSS_REAUTH,    eapGssSmAcceptGssReauth          },
 602 #endif
 603 };
 604
 605 OM_uint32
 606 gss_accept_sec_context(OM_uint32 *minor,
 607                        gss_ctx_id_t *context_handle,
 608                        gss_cred_id_t cred,
 609                        gss_buffer_t input_token,
 610                        gss_channel_bindings_t input_chan_bindings,
 611                        gss_name_t *src_name,
 612                        gss_OID *mech_type,
 613                        gss_buffer_t output_token,
 614                        OM_uint32 *ret_flags,
 615                        OM_uint32 *time_rec,
 616                        gss_cred_id_t *delegated_cred_handle)
 617 {
 618     OM_uint32 major;
 619     OM_uint32 tmpMajor, tmpMinor;
 620     gss_ctx_id_t ctx = *context_handle;
 621     struct gss_eap_acceptor_sm *sm = NULL;
 622     gss_buffer_desc innerInputToken = GSS_C_EMPTY_BUFFER;
 623     gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER;
 624     enum gss_eap_token_type tokType;
 625     int initialContextToken = 0;
 626
 627     *minor = 0;
 628
 629     output_token->length = 0;
 630     output_token->value = NULL;
 631
 632     if (input_token == GSS_C_NO_BUFFER || input_token->length == 0) {
 633         *minor = GSSEAP_TOK_TRUNC;
 634         return GSS_S_DEFECTIVE_TOKEN;
 635     }
 636
 637     if (ctx == GSS_C_NO_CONTEXT) {
 638         major = gssEapAllocContext(minor, &ctx);
 639         if (GSS_ERROR(major))
 640             return major;
 641
 642         initialContextToken = 1;
 643         *context_handle = ctx;
 644     }
 645
 646     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 647
 648     if (cred == GSS_C_NO_CREDENTIAL) {
 649         if (ctx->defaultCred == GSS_C_NO_CREDENTIAL) {
 650             major = gssEapAcquireCred(minor,
 651                                       GSS_C_NO_NAME,
 652                                       GSS_C_NO_BUFFER,
 653                                       GSS_C_INDEFINITE,
 654                                       GSS_C_NO_OID_SET,
 655                                       GSS_C_ACCEPT,
 656                                       &ctx->defaultCred,
 657                                       NULL,
 658                                       NULL);
 659             if (GSS_ERROR(major))
 660                 goto cleanup;
 661         }
 662
 663         cred = ctx->defaultCred;
 664     }
 665
 666     GSSEAP_MUTEX_LOCK(&cred->mutex);
 667
 668     sm = &eapGssAcceptorSm[ctx->state];
 669
 670     major = gssEapVerifyToken(minor, ctx, input_token,
 671                               &tokType, &innerInputToken);
 672     if (GSS_ERROR(major))
 673         goto cleanup;
 674
 675     if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
 676         *minor = GSSEAP_CRED_MECH_MISMATCH;
 677         major = GSS_S_BAD_MECH;
 678         goto cleanup;
 679     }
 680
 681 #ifdef GSSEAP_ENABLE_REAUTH
 682     /*
 683      * If we're built with fast reauthentication support, it's valid
 684      * for an initiator to send a GSS reauthentication token as its
 685      * initial context token, causing us to short-circuit the state
 686      * machine and process Kerberos GSS messages instead.
 687      */
 688     if (tokType == TOK_TYPE_GSS_REAUTH && initialContextToken) {
 689         ctx->state = GSSEAP_STATE_KRB_REAUTH;
 690     } else
 691 #endif
 692     if (tokType != sm->inputTokenType) {
 693         *minor = GSSEAP_WRONG_TOK_ID;
 694         major = GSS_S_DEFECTIVE_TOKEN;
 695         goto cleanup;
 696     }
 697
 698     do {
 699         sm = &eapGssAcceptorSm[ctx->state];
 700
 701         major = (sm->processToken)(minor,
 702                                    ctx,
 703                                    cred,
 704                                    &innerInputToken,
 705                                    input_chan_bindings,
 706                                    &innerOutputToken);
 707         if (GSS_ERROR(major)) {
 708             /* Possibly generate an error token */
 709             tmpMajor = makeErrorToken(&tmpMinor, major, *minor, &innerOutputToken);
 710             if (GSS_ERROR(tmpMajor)) {
 711                 major = tmpMajor;
 712                 goto cleanup;
 713             }
 714
 715             sm = &eapGssAcceptorSm[GSSEAP_STATE_ERROR];
 716             goto send_token;
 717         }
 718     } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.length == 0);
 719
 720     if (mech_type != NULL) {
 721         if (!gssEapInternalizeOid(ctx->mechanismUsed, mech_type))
 722             duplicateOid(&tmpMinor, ctx->mechanismUsed, mech_type);
 723     }
 724     if (ret_flags != NULL)
 725         *ret_flags = ctx->gssFlags;
 726     if (delegated_cred_handle != NULL)
 727         *delegated_cred_handle = GSS_C_NO_CREDENTIAL;
 728
 729     if (major == GSS_S_COMPLETE) {
 730         if (src_name != NULL && ctx->initiatorName != GSS_C_NO_NAME) {
 731             major = gssEapDuplicateName(&tmpMinor, ctx->initiatorName, src_name);
 732             if (GSS_ERROR(major))
 733                 goto cleanup;
 734         }
 735         if (time_rec != NULL) {
 736             major = gssEapContextTime(&tmpMinor, ctx, time_rec);
 737             if (GSS_ERROR(major))
 738                 goto cleanup;
 739         }
 740     }
 741
 742     assert(ctx->state == GSSEAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
 743
 744 send_token:
 745     if (innerOutputToken.value != NULL) {
 746         tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
 747                                    sm->outputTokenType, output_token);
 748         if (GSS_ERROR(tmpMajor)) {
 749             major = tmpMajor;
 750             *minor = tmpMinor;
 751             goto cleanup;
 752         }
 753     }
 754
 755 cleanup:
 756     if (cred != GSS_C_NO_CREDENTIAL)
 757         GSSEAP_MUTEX_UNLOCK(&cred->mutex);
 758     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 759
 760     if (GSS_ERROR(major))
 761         gssEapReleaseContext(&tmpMinor, context_handle);
 762
 763     gss_release_buffer(&tmpMinor, &innerOutputToken);
 764
 765     return major;
 766 }
 767
 768 #ifdef GSSEAP_ENABLE_REAUTH
 769 static OM_uint32
 770 acceptReadyKrb(OM_uint32 *minor,
 771                gss_ctx_id_t ctx,
 772                gss_cred_id_t cred,
 773                const gss_name_t initiator,
 774                const gss_OID mech,
 775                OM_uint32 timeRec)
 776 {
 777     OM_uint32 major;
 778
 779     major = gssEapGlueToMechName(minor, ctx, initiator, &ctx->initiatorName);
 780     if (GSS_ERROR(major))
 781         return major;
 782
 783     if (cred->name != GSS_C_NO_NAME) {
 784         major = gssEapDuplicateName(minor, cred->name, &ctx->acceptorName);
 785         if (GSS_ERROR(major))
 786             return major;
 787     }
 788
 789     major = gssEapReauthComplete(minor, ctx, cred, mech, timeRec);
 790     if (GSS_ERROR(major))
 791         return major;
 792
 793     ctx->state = GSSEAP_STATE_ESTABLISHED;
 794
 795     *minor = 0;
 796     return GSS_S_COMPLETE;
 797 }
 798
 799 static OM_uint32
 800 eapGssSmAcceptGssReauth(OM_uint32 *minor,
 801                         gss_ctx_id_t ctx,
 802                         gss_cred_id_t cred,
 803                         gss_buffer_t inputToken,
 804                         gss_channel_bindings_t chanBindings,
 805                         gss_buffer_t outputToken)
 806 {
 807     OM_uint32 major, tmpMinor;
 808     gss_name_t krbInitiator = GSS_C_NO_NAME;
 809     gss_OID mech = GSS_C_NO_OID;
 810     OM_uint32 gssFlags, timeRec = GSS_C_INDEFINITE;
 811
 812     ctx->flags |= CTX_FLAG_KRB_REAUTH;
 813
 814     major = gssAcceptSecContext(minor,
 815                                 &ctx->kerberosCtx,
 816                                 cred->krbCred,
 817                                 inputToken,
 818                                 chanBindings,
 819                                 &krbInitiator,
 820                                 &mech,
 821                                 outputToken,
 822                                 &gssFlags,
 823                                 &timeRec,
 824                                 NULL);
 825     if (major == GSS_S_COMPLETE) {
 826         major = acceptReadyKrb(minor, ctx, cred,
 827                                krbInitiator, mech, timeRec);
 828     }
 829
 830     ctx->gssFlags = gssFlags;
 831
 832     gssReleaseName(&tmpMinor, &krbInitiator);
 833
 834     return major;
 835 }
 836 #endif /* GSSEAP_ENABLE_REAUTH */