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

   1 /*
   2  * Copyright (c) 2010, 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 #include "gssapiP_eap.h"
  34
  35 #include <dlfcn.h>
  36
  37 /*
  38  * Fast reauthentication support for EAP GSS.
  39  */
  40
  41 krb5_error_code
  42 krb5_encrypt_tkt_part(krb5_context, const krb5_keyblock *, krb5_ticket *);
  43
  44 krb5_error_code
  45 encode_krb5_ticket(const krb5_ticket *rep, krb5_data **code);
  46
  47 static OM_uint32
  48 gssDisplayName(OM_uint32 *minor,
  49                gss_name_t name,
  50                gss_buffer_t buffer,
  51                gss_OID *name_type);
  52
  53 static OM_uint32
  54 gssImportName(OM_uint32 *minor,
  55               gss_buffer_t buffer,
  56               gss_OID name_type,
  57               gss_name_t *name);
  58
  59 static krb5_error_code
  60 getAcceptorKey(krb5_context krbContext,
  61                gss_ctx_id_t ctx,
  62                gss_cred_id_t cred,
  63                krb5_principal *princ,
  64                krb5_keyblock *key)
  65 {
  66     krb5_error_code code;
  67     krb5_keytab keytab = NULL;
  68     krb5_keytab_entry ktent = { 0 };
  69     krb5_kt_cursor cursor = NULL;
  70
  71     *princ = NULL;
  72     memset(key, 0, sizeof(*key));
  73
  74     code = krb5_kt_default(krbContext, &keytab);
  75     if (code != 0)
  76         goto cleanup;
  77
  78     if (cred != GSS_C_NO_CREDENTIAL && cred->name != GSS_C_NO_NAME) {
  79         code = krb5_kt_get_entry(krbContext, keytab,
  80                                  cred->name->krbPrincipal, 0,
  81                                  ctx->encryptionType, &ktent);
  82         if (code != 0)
  83             goto cleanup;
  84     } else {
  85         code = krb5_kt_start_seq_get(krbContext, keytab, &cursor);
  86         if (code != 0)
  87             goto cleanup;
  88
  89         while ((code = krb5_kt_next_entry(krbContext, keytab,
  90                                           &ktent, &cursor)) == 0) {
  91             if (ktent.key.enctype == ctx->encryptionType)
  92                 break;
  93             else
  94                 krb5_free_keytab_entry_contents(krbContext, &ktent);
  95         }
  96     }
  97
  98     if (code == 0) {
  99         *princ = ktent.principal;
 100         *key = ktent.key;
 101     }
 102
 103 cleanup:
 104     if (cred == GSS_C_NO_CREDENTIAL || cred->name == GSS_C_NO_NAME)
 105         krb5_kt_end_seq_get(krbContext, keytab, &cursor);
 106     krb5_kt_close(krbContext, keytab);
 107
 108     if (code != 0)
 109         krb5_free_keytab_entry_contents(krbContext, &ktent);
 110
 111     return code;
 112 }
 113
 114 static OM_uint32
 115 freezeAttrContext(OM_uint32 *minor,
 116                   gss_name_t initiatorName,
 117                   krb5_const_principal acceptorPrinc,
 118                   krb5_keyblock *session,
 119                   krb5_authdata ***authdata)
 120 {
 121     OM_uint32 major, tmpMinor;
 122     krb5_error_code code;
 123     gss_buffer_desc attrBuf = GSS_C_EMPTY_BUFFER;
 124     krb5_authdata *authData[2], authDatum = { 0 };
 125     krb5_context krbContext;
 126
 127     GSSEAP_KRB_INIT(&krbContext);
 128
 129     major = gssEapExportAttrContext(minor, initiatorName, &attrBuf);
 130     if (GSS_ERROR(major))
 131         return major;
 132
 133     authDatum.ad_type = KRB5_AUTHDATA_RADIUS_AVP;
 134     authDatum.length = attrBuf.length;
 135     authDatum.contents = attrBuf.value;
 136     authData[0] = &authDatum;
 137     authData[1] = NULL;
 138
 139     code = krb5_make_authdata_kdc_issued(krbContext, session, acceptorPrinc,
 140                                          authData, authdata);
 141     if (code != 0) {
 142         major = GSS_S_FAILURE;
 143         *minor = code;
 144     } else {
 145         major = GSS_S_COMPLETE;
 146     }
 147
 148     gss_release_buffer(&tmpMinor, &attrBuf);
 149
 150     return major;
 151 }
 152
 153 /*
 154  * Fabricate a ticket to ourselves given a GSS EAP context.
 155  */
 156 OM_uint32
 157 gssEapMakeReauthCreds(OM_uint32 *minor,
 158                       gss_ctx_id_t ctx,
 159                       gss_cred_id_t cred,
 160                       gss_buffer_t credBuf)
 161 {
 162     OM_uint32 major = GSS_S_COMPLETE;
 163     krb5_error_code code;
 164     krb5_context krbContext = NULL;
 165     krb5_ticket ticket = { 0 };
 166     krb5_keyblock session = { 0 }, acceptorKey = { 0 };
 167     krb5_enc_tkt_part enc_part = { 0 };
 168     krb5_data *ticketData = NULL, *credsData = NULL;
 169     krb5_creds creds = { 0 };
 170     krb5_auth_context authContext = NULL;
 171
 172     credBuf->length = 0;
 173     credBuf->value = NULL;
 174
 175     GSSEAP_KRB_INIT(&krbContext);
 176
 177     code = getAcceptorKey(krbContext, ctx, cred,
 178                           &ticket.server, &acceptorKey);
 179     if (code == KRB5_KT_NOTFOUND) {
 180         gss_buffer_desc emptyToken = { 0, "" };
 181
 182         /*
 183          * If we can't produce the KRB-CRED message, we need to
 184          * return an empty (not NULL) token to the caller so we
 185          * don't change the number of authentication legs.
 186          */
 187         return duplicateBuffer(minor, &emptyToken, credBuf);
 188     } else if (code != 0)
 189         goto cleanup;
 190
 191     enc_part.flags = TKT_FLG_INITIAL;
 192
 193     /*
 194      * Generate a random session key to place in the ticket and
 195      * sign the "KDC-Issued" authorization data element.
 196      */
 197     code = krb5_c_make_random_key(krbContext, ctx->encryptionType,
 198                                   &session);
 199     if (code != 0)
 200         goto cleanup;
 201
 202     enc_part.session = &session;
 203     enc_part.client = ctx->initiatorName->krbPrincipal;
 204     enc_part.times.authtime = time(NULL);
 205     enc_part.times.starttime = enc_part.times.authtime;
 206     enc_part.times.endtime = ctx->expiryTime
 207                              ? ctx->expiryTime
 208                              : KRB5_INT32_MAX;
 209     enc_part.times.renew_till = 0;
 210
 211     major = freezeAttrContext(minor, ctx->initiatorName, ticket.server,
 212                               &session, &enc_part.authorization_data);
 213     if (GSS_ERROR(major))
 214         goto cleanup;
 215
 216     ticket.enc_part2 = &enc_part;
 217
 218     code = krb5_encrypt_tkt_part(krbContext, &acceptorKey, &ticket);
 219     if (code != 0)
 220         goto cleanup;
 221
 222     code = encode_krb5_ticket(&ticket, &ticketData);
 223     if (code != 0)
 224         goto cleanup;
 225
 226     creds.client = enc_part.client;
 227     creds.server = ticket.server;
 228     creds.keyblock = session;
 229     creds.times = enc_part.times;
 230     creds.ticket_flags = enc_part.flags;
 231     creds.ticket = *ticketData;
 232     creds.authdata = enc_part.authorization_data;
 233
 234     code = krb5_auth_con_init(krbContext, &authContext);
 235     if (code != 0)
 236         goto cleanup;
 237
 238     code = krb5_auth_con_setflags(krbContext, authContext, 0);
 239     if (code != 0)
 240         goto cleanup;
 241
 242     code = krb5_auth_con_setsendsubkey(krbContext, authContext,
 243                                        &ctx->rfc3961Key);
 244     if (code != 0)
 245         goto cleanup;
 246
 247     code = krb5_mk_1cred(krbContext, authContext, &creds, &credsData, NULL);
 248     if (code != 0)
 249         goto cleanup;
 250
 251     krbDataToGssBuffer(credsData, credBuf);
 252
 253 cleanup:
 254     if (ticket.enc_part.ciphertext.data != NULL)
 255         GSSEAP_FREE(ticket.enc_part.ciphertext.data);
 256     krb5_free_keyblock_contents(krbContext, &session);
 257     krb5_free_keyblock_contents(krbContext, &acceptorKey);
 258     krb5_free_data(krbContext, ticketData);
 259     krb5_auth_con_free(krbContext, authContext);
 260     krb5_free_authdata(krbContext, enc_part.authorization_data);
 261     if (credsData != NULL)
 262         GSSEAP_FREE(credsData);
 263
 264     if (major == GSS_S_COMPLETE) {
 265         *minor = code;
 266         major = code != 0 ? GSS_S_FAILURE : GSS_S_COMPLETE;
 267     }
 268
 269     return major;
 270 }
 271
 272 static int
 273 isTicketGrantingServiceP(krb5_context krbContext,
 274                          krb5_const_principal principal)
 275 {
 276     if (krb5_princ_size(krbContext, principal) == 2 &&
 277         krb5_princ_component(krbContext, principal, 0)->length == 6 &&
 278         memcmp(krb5_princ_component(krbContext,
 279                                     principal, 0)->data, "krbtgt", 6) == 0)
 280         return TRUE;
 281
 282     return FALSE;
 283 }
 284
 285 /*
 286  * Store re-authentication (Kerberos) credentials in a credential handle.
 287  */
 288 OM_uint32
 289 gssEapStoreReauthCreds(OM_uint32 *minor,
 290                        gss_ctx_id_t ctx,
 291                        gss_cred_id_t cred,
 292                        gss_buffer_t credBuf)
 293 {
 294     OM_uint32 major = GSS_S_COMPLETE, code;
 295     krb5_context krbContext = NULL;
 296     krb5_auth_context authContext = NULL;
 297     krb5_data credData = { 0 };
 298     krb5_creds **creds = NULL;
 299     krb5_principal canonPrinc;
 300     int i;
 301
 302     if (credBuf->length == 0 || cred == GSS_C_NO_CREDENTIAL)
 303         return GSS_S_COMPLETE;
 304
 305     GSSEAP_KRB_INIT(&krbContext);
 306
 307     code = krb5_auth_con_init(krbContext, &authContext);
 308     if (code != 0)
 309         goto cleanup;
 310
 311     code = krb5_auth_con_setflags(krbContext, authContext, 0);
 312     if (code != 0)
 313         goto cleanup;
 314
 315     code = krb5_auth_con_setrecvsubkey(krbContext, authContext,
 316                                        &ctx->rfc3961Key);
 317     if (code != 0)
 318         goto cleanup;
 319
 320     gssBufferToKrbData(credBuf, &credData);
 321
 322     code = krb5_rd_cred(krbContext, authContext, &credData, &creds, NULL);
 323     if (code != 0)
 324         goto cleanup;
 325
 326     if (creds == NULL || creds[0] == NULL)
 327         goto cleanup;
 328
 329     code = krb5_copy_principal(krbContext, creds[0]->client, &canonPrinc);
 330     if (code != 0)
 331         goto cleanup;
 332
 333     krb5_free_principal(krbContext, cred->name->krbPrincipal);
 334     cred->name->krbPrincipal = canonPrinc;
 335
 336     cred->expiryTime = creds[0]->times.endtime;
 337
 338     code = krb5_cc_new_unique(krbContext, "MEMORY", NULL, &cred->krbCredCache);
 339     if (code != 0)
 340         goto cleanup;
 341
 342     code = krb5_cc_initialize(krbContext, cred->krbCredCache,
 343                               creds[0]->client);
 344     if (code != 0)
 345         goto cleanup;
 346
 347     for (i = 0; creds[i] != NULL; i++) {
 348         krb5_creds kcred = *(creds[i]);
 349
 350         /*
 351          * Swap in the acceptor name the client asked for so
 352          * get_credentials() works. We're making the assumption that
 353          * any service tickets returned are for us. We'll need to
 354          * reflect some more on whether that is a safe assumption.
 355          */
 356         if (!isTicketGrantingServiceP(krbContext, kcred.server))
 357             kcred.server = ctx->acceptorName->krbPrincipal;
 358
 359         code = krb5_cc_store_cred(krbContext, cred->krbCredCache, &kcred);
 360         if (code != 0)
 361             goto cleanup;
 362     }
 363
 364     /*
 365      * To turn a credentials cache into a GSS credentials handle, we
 366      * require the gss_krb5_import_cred() API (present in Heimdal, but
 367      * not shipped in MIT yet).
 368      */
 369     major = gss_krb5_import_cred(minor, cred->krbCredCache, NULL, NULL,
 370                                  &cred->krbCred);
 371     if (GSS_ERROR(major))
 372         goto cleanup;
 373
 374 cleanup:
 375     *minor = code;
 376
 377     krb5_auth_con_free(krbContext, authContext);
 378     if (creds != NULL) {
 379         for (i = 0; creds[i] != NULL; i++)
 380             krb5_free_creds(krbContext, creds[i]);
 381     }
 382     if (major == GSS_S_COMPLETE)
 383         major = *minor ? GSS_S_FAILURE : GSS_S_COMPLETE;
 384
 385     return major;
 386 }
 387
 388 static gss_buffer_desc radiusAvpKrbAttr = {
 389     sizeof("urn:authdata-radius-avp") - 1, "urn:authdata-radius-avp"
 390 };
 391
 392 /*
 393  * Unfortunately extracting an AD-KDCIssued authorization data element
 394  * is pretty implementation-dependent. It's not possible to verify the
 395  * signature ourselves because the ticket session key is not exposed
 396  * outside GSS. In an ideal world, all AD-KDCIssued elements would be
 397  * verified by the Kerberos library and authentication would fail if
 398  * verification failed. We're not quite there yet and as a result have
 399  * to go through some hoops to get this to work. The alternative would
 400  * be to sign the authorization data with our long-term key, but it
 401  * seems a pity to compromise the design because of current implementation
 402  * limitations.
 403  *
 404  * (Specifically, the hoops involve a libkrb5 authorisation data plugin
 405  * that exposes the verified and serialised attribute context through
 406  * the Kerberos GSS mechanism's naming extensions API.)
 407  */
 408 static OM_uint32
 409 defrostAttrContext(OM_uint32 *minor,
 410                    gss_name_t glueName,
 411                    gss_name_t mechName)
 412 {
 413     OM_uint32 major, tmpMinor;
 414     gss_buffer_desc authData = GSS_C_EMPTY_BUFFER;
 415     gss_buffer_desc authDataDisplay = GSS_C_EMPTY_BUFFER;
 416     int more = -1;
 417     int authenticated, complete;
 418
 419     major = gssGetNameAttribute(minor, glueName, &radiusAvpKrbAttr,
 420                                 &authenticated, &complete,
 421                                 &authData, &authDataDisplay, &more);
 422     if (major == GSS_S_COMPLETE) {
 423         if (authenticated == 0)
 424             major = GSS_S_BAD_NAME;
 425         else
 426             major = gssEapImportAttrContext(minor, &authData, mechName);
 427     } else if (major == GSS_S_UNAVAILABLE) {
 428         major = GSS_S_COMPLETE;
 429     }
 430
 431     gss_release_buffer(&tmpMinor, &authData);
 432     gss_release_buffer(&tmpMinor, &authDataDisplay);
 433
 434     return major;
 435 }
 436
 437 /*
 438  * Convert a mechanism glue to an EAP mechanism name by displaying and
 439  * importing it. This also handles the RADIUS attributes.
 440  */
 441 OM_uint32
 442 gssEapGlueToMechName(OM_uint32 *minor,
 443                      gss_name_t glueName,
 444                      gss_name_t *pMechName)
 445 {
 446     OM_uint32 major, tmpMinor;
 447     gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
 448
 449     *pMechName = GSS_C_NO_NAME;
 450
 451     major = gssDisplayName(minor, glueName, &nameBuf, NULL);
 452     if (GSS_ERROR(major))
 453         goto cleanup;
 454
 455     major = gssEapImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
 456                              pMechName);
 457     if (GSS_ERROR(major))
 458         goto cleanup;
 459
 460     major = defrostAttrContext(minor, glueName, *pMechName);
 461     if (GSS_ERROR(major))
 462         goto cleanup;
 463
 464 cleanup:
 465     if (GSS_ERROR(major)) {
 466         gssReleaseName(&tmpMinor, pMechName);
 467         *pMechName = GSS_C_NO_NAME;
 468     }
 469
 470     gss_release_buffer(&tmpMinor, &nameBuf);
 471
 472     return major;
 473 }
 474
 475 /*
 476  * Convert an EAP mechanism name to a mechanism glue name by displaying
 477  * and importing it.
 478  */
 479 OM_uint32
 480 gssEapMechToGlueName(OM_uint32 *minor,
 481                      gss_name_t mechName,
 482                      gss_name_t *pGlueName)
 483 {
 484     OM_uint32 major, tmpMinor;
 485     gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
 486
 487     *pGlueName = GSS_C_NO_NAME;
 488
 489     major = gssEapDisplayName(minor, mechName, &nameBuf, NULL);
 490     if (GSS_ERROR(major))
 491         goto cleanup;
 492
 493     major = gssImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
 494                           pGlueName);
 495     if (GSS_ERROR(major))
 496         goto cleanup;
 497
 498 cleanup:
 499     gss_release_buffer(&tmpMinor, &nameBuf);
 500
 501     return major;
 502 }
 503
 504 /*
 505  * Suck out the analgous elements of a Kerberos GSS context into an EAP
 506  * one so that the application doesn't know the difference.
 507  */
 508 OM_uint32
 509 gssEapReauthComplete(OM_uint32 *minor,
 510                     gss_ctx_id_t ctx,
 511                     gss_cred_id_t cred,
 512                     const gss_OID mech,
 513                     OM_uint32 timeRec)
 514 {
 515     OM_uint32 major, tmpMinor;
 516     gss_buffer_set_t keyData = GSS_C_NO_BUFFER_SET;
 517
 518     if (!oidEqual(mech, gss_mech_krb5)) {
 519         major = GSS_S_BAD_MECH;
 520         goto cleanup;
 521     }
 522
 523     /* Get the raw subsession key and encryptino type*/
 524     major = gssInquireSecContextByOid(minor, ctx->kerberosCtx,
 525                                       GSS_C_INQ_SSPI_SESSION_KEY, &keyData);
 526     if (GSS_ERROR(major))
 527         goto cleanup;
 528
 529     {
 530         gss_OID_desc oid;
 531         int suffix;
 532
 533         oid.length = keyData->elements[1].length;
 534         oid.elements = keyData->elements[1].value;
 535
 536         /* GSS_KRB5_SESSION_KEY_ENCTYPE_OID */
 537         major = decomposeOid(minor,
 538                              "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02\x04",
 539                              10, &oid, &suffix);
 540         if (GSS_ERROR(major))
 541             goto cleanup;
 542
 543         ctx->encryptionType = suffix;
 544     }
 545
 546     {
 547         krb5_context krbContext = NULL;
 548         krb5_keyblock key;
 549
 550         GSSEAP_KRB_INIT(&krbContext);
 551
 552         KRB_KEY_LENGTH(&key) = keyData->elements[0].length;
 553         KRB_KEY_DATA(&key)   = keyData->elements[0].value;
 554         KRB_KEY_TYPE(&key)   = ctx->encryptionType;
 555
 556         *minor = krb5_copy_keyblock_contents(krbContext,
 557                                              &key, &ctx->rfc3961Key);
 558         if (*minor != 0) {
 559             major = GSS_S_FAILURE;
 560             goto cleanup;
 561         }
 562     }
 563
 564     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 565                                       &ctx->checksumType);
 566     if (GSS_ERROR(major))
 567         goto cleanup;
 568
 569     if (timeRec != GSS_C_INDEFINITE)
 570         ctx->expiryTime = time(NULL) + timeRec;
 571
 572     /* Initialize our sequence state */
 573     major = sequenceInit(minor,
 574                          &ctx->seqState, ctx->recvSeq,
 575                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 576                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 577                          TRUE);
 578     if (GSS_ERROR(major))
 579         goto cleanup;
 580
 581     major = GSS_S_COMPLETE;
 582
 583 cleanup:
 584     gss_release_buffer_set(&tmpMinor, &keyData);
 585
 586     return major;
 587 }
 588
 589 /*
 590  * The remainder of this file consists of wrappers so we can call into the
 591  * mechanism glue without calling ourselves.
 592  */
 593 static OM_uint32
 594 (*gssInitSecContextNext)(OM_uint32 *,
 595                          gss_cred_id_t,
 596                          gss_ctx_id_t *,
 597                          gss_name_t,
 598                          gss_OID,
 599                          OM_uint32,
 600                          OM_uint32,
 601                          gss_channel_bindings_t,
 602                          gss_buffer_t,
 603                          gss_OID *,
 604                          gss_buffer_t,
 605                          OM_uint32 *,
 606                          OM_uint32 *);
 607
 608 static OM_uint32
 609 (*gssAcceptSecContextNext)(OM_uint32 *,
 610                            gss_ctx_id_t *,
 611                            gss_cred_id_t,
 612                            gss_buffer_t,
 613                            gss_channel_bindings_t,
 614                            gss_name_t *,
 615                            gss_OID *,
 616                            gss_buffer_t,
 617                            OM_uint32 *,
 618                            OM_uint32 *,
 619                            gss_cred_id_t *);
 620
 621 static OM_uint32
 622 (*gssReleaseCredNext)(OM_uint32 *, gss_cred_id_t *);
 623
 624 static OM_uint32
 625 (*gssReleaseNameNext)(OM_uint32 *, gss_name_t *);
 626
 627 static OM_uint32
 628 (*gssInquireSecContextByOidNext)(OM_uint32 *,
 629                                  const gss_ctx_id_t,
 630                                  const gss_OID,
 631                                  gss_buffer_set_t *);
 632
 633 static OM_uint32
 634 (*gssDeleteSecContextNext)(OM_uint32 *,
 635                           gss_ctx_id_t *,
 636                           gss_buffer_t);
 637
 638 static OM_uint32
 639 (*gssDisplayNameNext)(OM_uint32 *,
 640                       gss_name_t,
 641                       gss_buffer_t,
 642                       gss_OID *);
 643
 644 static OM_uint32
 645 (*gssImportNameNext)(OM_uint32 *,
 646                      gss_buffer_t,
 647                      gss_OID,
 648                      gss_name_t *);
 649
 650 static OM_uint32
 651 (*gssStoreCredNext)(OM_uint32 *,
 652                     const gss_cred_id_t,
 653                     gss_cred_usage_t,
 654                     const gss_OID,
 655                     OM_uint32,
 656                     OM_uint32,
 657                     gss_OID_set *,
 658                     gss_cred_usage_t *);
 659
 660 static OM_uint32
 661 (*gssGetNameAttributeNext)(OM_uint32 *,
 662                           gss_name_t,
 663                           gss_buffer_t,
 664                           int *,
 665                           int *,
 666                           gss_buffer_t,
 667                           gss_buffer_t,
 668                           int *);
 669
 670 #define NEXT_SYMBOL(local, global)  ((local) = dlsym(RTLD_NEXT, (global)))
 671
 672 OM_uint32
 673 gssEapReauthInitialize(OM_uint32 *minor)
 674 {
 675     NEXT_SYMBOL(gssInitSecContextNext,                    "gss_init_sec_context");
 676     NEXT_SYMBOL(gssAcceptSecContextNext,                  "gss_accept_sec_context");
 677     NEXT_SYMBOL(gssReleaseCredNext,                       "gss_release_cred");
 678     NEXT_SYMBOL(gssReleaseNameNext,                       "gss_release_name");
 679     NEXT_SYMBOL(gssInquireSecContextByOidNext,            "gss_inquire_sec_context_by_oid");
 680     NEXT_SYMBOL(gssDeleteSecContextNext,                  "gss_delete_sec_context");
 681     NEXT_SYMBOL(gssDisplayNameNext,                       "gss_display_name");
 682     NEXT_SYMBOL(gssImportNameNext,                        "gss_import_name");
 683     NEXT_SYMBOL(gssStoreCredNext,                         "gss_store_cred");
 684     NEXT_SYMBOL(gssGetNameAttributeNext,                  "gss_get_name_attribute");
 685
 686     return GSS_S_COMPLETE;
 687 }
 688
 689 OM_uint32
 690 gssInitSecContext(OM_uint32 *minor,
 691                   gss_cred_id_t cred,
 692                   gss_ctx_id_t *context_handle,
 693                   gss_name_t target_name,
 694                   gss_OID mech_type,
 695                   OM_uint32 req_flags,
 696                   OM_uint32 time_req,
 697                   gss_channel_bindings_t input_chan_bindings,
 698                   gss_buffer_t input_token,
 699                   gss_OID *actual_mech_type,
 700                   gss_buffer_t output_token,
 701                   OM_uint32 *ret_flags,
 702                   OM_uint32 *time_rec)
 703 {
 704     if (gssInitSecContextNext == NULL)
 705         return GSS_S_UNAVAILABLE;
 706
 707     return gssInitSecContextNext(minor, cred, context_handle,
 708                                  target_name, mech_type, req_flags,
 709                                  time_req, input_chan_bindings,
 710                                  input_token, actual_mech_type,
 711                                  output_token, ret_flags, time_rec);
 712 }
 713
 714 OM_uint32
 715 gssAcceptSecContext(OM_uint32 *minor,
 716                     gss_ctx_id_t *context_handle,
 717                     gss_cred_id_t cred,
 718                     gss_buffer_t input_token,
 719                     gss_channel_bindings_t input_chan_bindings,
 720                     gss_name_t *src_name,
 721                     gss_OID *mech_type,
 722                     gss_buffer_t output_token,
 723                     OM_uint32 *ret_flags,
 724                     OM_uint32 *time_rec,
 725                     gss_cred_id_t *delegated_cred_handle)
 726 {
 727     if (gssAcceptSecContextNext == NULL)
 728         return GSS_S_UNAVAILABLE;
 729
 730     return gssAcceptSecContextNext(minor, context_handle, cred,
 731                                    input_token, input_chan_bindings,
 732                                    src_name, mech_type, output_token,
 733                                    ret_flags, time_rec, delegated_cred_handle);
 734 }
 735
 736 OM_uint32
 737 gssReleaseCred(OM_uint32 *minor,
 738                gss_cred_id_t *cred_handle)
 739 {
 740     if (gssReleaseCredNext == NULL)
 741         return GSS_S_UNAVAILABLE;
 742
 743     return gssReleaseCredNext(minor, cred_handle);
 744 }
 745
 746 OM_uint32
 747 gssReleaseName(OM_uint32 *minor,
 748                gss_name_t *name)
 749 {
 750     if (gssReleaseName == NULL)
 751         return GSS_S_UNAVAILABLE;
 752
 753     return gssReleaseNameNext(minor, name);
 754 }
 755
 756 OM_uint32
 757 gssDeleteSecContext(OM_uint32 *minor,
 758                     gss_ctx_id_t *context_handle,
 759                     gss_buffer_t output_token)
 760 {
 761     if (gssDeleteSecContextNext == NULL)
 762         return GSS_S_UNAVAILABLE;
 763
 764     return gssDeleteSecContextNext(minor, context_handle, output_token);
 765 }
 766
 767 static OM_uint32
 768 gssDisplayName(OM_uint32 *minor,
 769                gss_name_t name,
 770                gss_buffer_t buffer,
 771                gss_OID *name_type)
 772 {
 773     if (gssDisplayNameNext == NULL)
 774         return GSS_S_UNAVAILABLE;
 775
 776     return gssDisplayNameNext(minor, name, buffer, name_type);
 777 }
 778
 779 static OM_uint32
 780 gssImportName(OM_uint32 *minor,
 781               gss_buffer_t buffer,
 782               gss_OID name_type,
 783               gss_name_t *name)
 784 {
 785     if (gssImportNameNext == NULL)
 786         return GSS_S_UNAVAILABLE;
 787
 788     return gssImportNameNext(minor, buffer, name_type, name);
 789 }
 790
 791 OM_uint32
 792 gssInquireSecContextByOid(OM_uint32 *minor,
 793                           const gss_ctx_id_t context_handle,
 794                           const gss_OID desired_object,
 795                           gss_buffer_set_t *data_set)
 796 {
 797     if (gssInquireSecContextByOidNext == NULL)
 798         return GSS_S_UNAVAILABLE;
 799
 800     return gssInquireSecContextByOidNext(minor, context_handle,
 801                                          desired_object, data_set);
 802 }
 803
 804 OM_uint32
 805 gssStoreCred(OM_uint32 *minor,
 806              const gss_cred_id_t input_cred_handle,
 807              gss_cred_usage_t input_usage,
 808              const gss_OID desired_mech,
 809              OM_uint32 overwrite_cred,
 810              OM_uint32 default_cred,
 811              gss_OID_set *elements_stored,
 812              gss_cred_usage_t *cred_usage_stored)
 813 {
 814     if (gssStoreCredNext == NULL)
 815         return GSS_S_UNAVAILABLE;
 816
 817     return gssStoreCredNext(minor, input_cred_handle, input_usage,
 818                             desired_mech, overwrite_cred, default_cred,
 819                             elements_stored, cred_usage_stored);
 820 }
 821
 822 OM_uint32
 823 gssGetNameAttribute(OM_uint32 *minor,
 824                     gss_name_t name,
 825                     gss_buffer_t attr,
 826                     int *authenticated,
 827                     int *complete,
 828                     gss_buffer_t value,
 829                     gss_buffer_t display_value,
 830                     int *more)
 831 {
 832     if (gssGetNameAttributeNext == NULL)
 833         return GSS_S_UNAVAILABLE;
 834
 835     return gssGetNameAttributeNext(minor, name, attr, authenticated, complete,
 836                                    value, display_value, more);
 837 }