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         /*
  86          * It's not clear that looking encrypting the ticket in the
  87          * requested EAP enctype provides any value.
  88          */
  89         code = krb5_kt_start_seq_get(krbContext, keytab, &cursor);
  90         if (code != 0)
  91             goto cleanup;
  92
  93         while ((code = krb5_kt_next_entry(krbContext, keytab,
  94                                           &ktent, &cursor)) == 0) {
  95             if (ktent.key.enctype == ctx->encryptionType)
  96                 break;
  97             else
  98                 krb5_free_keytab_entry_contents(krbContext, &ktent);
  99         }
 100     }
 101
 102     if (code == 0) {
 103         *princ = ktent.principal;
 104         *key = ktent.key;
 105     }
 106
 107 cleanup:
 108     if (cred == GSS_C_NO_CREDENTIAL || cred->name == GSS_C_NO_NAME)
 109         krb5_kt_end_seq_get(krbContext, keytab, &cursor);
 110     krb5_kt_close(krbContext, keytab);
 111
 112     if (code != 0)
 113         krb5_free_keytab_entry_contents(krbContext, &ktent);
 114
 115     return code;
 116 }
 117
 118 static OM_uint32
 119 freezeAttrContext(OM_uint32 *minor,
 120                   gss_name_t initiatorName,
 121                   krb5_const_principal acceptorPrinc,
 122                   krb5_keyblock *session,
 123                   krb5_authdata ***authdata)
 124 {
 125     OM_uint32 major, tmpMinor;
 126     krb5_error_code code;
 127     gss_buffer_desc attrBuf = GSS_C_EMPTY_BUFFER;
 128     krb5_authdata *authData[2], authDatum = { 0 };
 129     krb5_context krbContext;
 130
 131     GSSEAP_KRB_INIT(&krbContext);
 132
 133     major = gssEapExportAttrContext(minor, initiatorName, &attrBuf);
 134     if (GSS_ERROR(major))
 135         return major;
 136
 137     authDatum.ad_type = KRB5_AUTHDATA_RADIUS_AVP;
 138     authDatum.length = attrBuf.length;
 139     authDatum.contents = attrBuf.value;
 140     authData[0] = &authDatum;
 141     authData[1] = NULL;
 142
 143     code = krb5_make_authdata_kdc_issued(krbContext, session, acceptorPrinc,
 144                                          authData, authdata);
 145     if (code != 0) {
 146         major = GSS_S_FAILURE;
 147         *minor = code;
 148     } else {
 149         major = GSS_S_COMPLETE;
 150     }
 151
 152     gss_release_buffer(&tmpMinor, &attrBuf);
 153
 154     return major;
 155 }
 156
 157 /*
 158  * Fabricate a ticket to ourselves given a GSS EAP context.
 159  */
 160 OM_uint32
 161 gssEapMakeReauthCreds(OM_uint32 *minor,
 162                       gss_ctx_id_t ctx,
 163                       gss_cred_id_t cred,
 164                       gss_buffer_t credBuf)
 165 {
 166     OM_uint32 major = GSS_S_COMPLETE;
 167     krb5_error_code code;
 168     krb5_context krbContext = NULL;
 169     krb5_ticket ticket = { 0 };
 170     krb5_keyblock session = { 0 }, acceptorKey = { 0 };
 171     krb5_enc_tkt_part enc_part = { 0 };
 172     krb5_data *ticketData = NULL, *credsData = NULL;
 173     krb5_creds creds = { 0 };
 174     krb5_auth_context authContext = NULL;
 175
 176     credBuf->length = 0;
 177     credBuf->value = NULL;
 178
 179     GSSEAP_KRB_INIT(&krbContext);
 180
 181     code = getAcceptorKey(krbContext, ctx, cred,
 182                           &ticket.server, &acceptorKey);
 183     if (code == KRB5_KT_NOTFOUND) {
 184         gss_buffer_desc emptyToken = { 0, "" };
 185
 186         /*
 187          * If we can't produce the KRB-CRED message, we need to
 188          * return an empty (not NULL) token to the caller so we
 189          * don't change the number of authentication legs.
 190          */
 191         return duplicateBuffer(minor, &emptyToken, credBuf);
 192     } else if (code != 0)
 193         goto cleanup;
 194
 195     enc_part.flags = TKT_FLG_INITIAL;
 196
 197     /*
 198      * Generate a random session key to place in the ticket and
 199      * sign the "KDC-Issued" authorization data element.
 200      */
 201     code = krb5_c_make_random_key(krbContext, ctx->encryptionType,
 202                                   &session);
 203     if (code != 0)
 204         goto cleanup;
 205
 206     enc_part.session = &session;
 207     enc_part.client = ctx->initiatorName->krbPrincipal;
 208     enc_part.times.authtime = time(NULL);
 209     enc_part.times.starttime = enc_part.times.authtime;
 210     enc_part.times.endtime = (ctx->expiryTime != 0)
 211                              ? ctx->expiryTime
 212                              : KRB5_INT32_MAX;
 213     enc_part.times.renew_till = 0;
 214
 215     major = freezeAttrContext(minor, ctx->initiatorName, ticket.server,
 216                               &session, &enc_part.authorization_data);
 217     if (GSS_ERROR(major))
 218         goto cleanup;
 219
 220     ticket.enc_part2 = &enc_part;
 221
 222     code = krb5_encrypt_tkt_part(krbContext, &acceptorKey, &ticket);
 223     if (code != 0)
 224         goto cleanup;
 225
 226     code = encode_krb5_ticket(&ticket, &ticketData);
 227     if (code != 0)
 228         goto cleanup;
 229
 230     creds.client = enc_part.client;
 231     creds.server = ticket.server;
 232     creds.keyblock = session;
 233     creds.times = enc_part.times;
 234     creds.ticket_flags = enc_part.flags;
 235     creds.ticket = *ticketData;
 236     creds.authdata = enc_part.authorization_data;
 237
 238     code = krb5_auth_con_init(krbContext, &authContext);
 239     if (code != 0)
 240         goto cleanup;
 241
 242     code = krb5_auth_con_setflags(krbContext, authContext, 0);
 243     if (code != 0)
 244         goto cleanup;
 245
 246     code = krb5_auth_con_setsendsubkey(krbContext, authContext,
 247                                        &ctx->rfc3961Key);
 248     if (code != 0)
 249         goto cleanup;
 250
 251     code = krb5_mk_1cred(krbContext, authContext, &creds, &credsData, NULL);
 252     if (code != 0)
 253         goto cleanup;
 254
 255     krbDataToGssBuffer(credsData, credBuf);
 256
 257 cleanup:
 258     if (ticket.enc_part.ciphertext.data != NULL)
 259         GSSEAP_FREE(ticket.enc_part.ciphertext.data);
 260     krb5_free_keyblock_contents(krbContext, &session);
 261     krb5_free_keyblock_contents(krbContext, &acceptorKey);
 262     krb5_free_data(krbContext, ticketData);
 263     krb5_auth_con_free(krbContext, authContext);
 264     krb5_free_authdata(krbContext, enc_part.authorization_data);
 265     if (credsData != NULL)
 266         GSSEAP_FREE(credsData);
 267
 268     if (major == GSS_S_COMPLETE) {
 269         *minor = code;
 270         major = code != 0 ? GSS_S_FAILURE : GSS_S_COMPLETE;
 271     }
 272
 273     return major;
 274 }
 275
 276 static int
 277 isTicketGrantingServiceP(krb5_context krbContext,
 278                          krb5_const_principal principal)
 279 {
 280     if (krb5_princ_size(krbContext, principal) == 2 &&
 281         krb5_princ_component(krbContext, principal, 0)->length == 6 &&
 282         memcmp(krb5_princ_component(krbContext,
 283                                     principal, 0)->data, "krbtgt", 6) == 0)
 284         return TRUE;
 285
 286     return FALSE;
 287 }
 288
 289 /*
 290  * Returns TRUE if the configuration variable reauth_use_ccache is
 291  * set in krb5.conf for the eap_gss application and the client realm.
 292  */
 293 static int
 294 reauthUseCredsCache(krb5_context krbContext,
 295                     krb5_principal principal)
 296 {
 297     int reauthUseCCache;
 298
 299     /* if reauth_use_ccache, use default credentials cache if ticket is for us */
 300     krb5_appdefault_boolean(krbContext, "eap_gss",
 301                             krb5_princ_realm(krbContext, principal),
 302                             "reauth_use_ccache", 0, &reauthUseCCache);
 303
 304     return reauthUseCCache;
 305 }
 306
 307 /*
 308  * Look in default credentials cache for reauthentication credentials,
 309  * if policy allows.
 310  */
 311 static OM_uint32
 312 getDefaultReauthCredentials(OM_uint32 *minor,
 313                             gss_cred_id_t cred,
 314                             gss_name_t target,
 315                             time_t now,
 316                             OM_uint32 timeReq)
 317 {
 318     OM_uint32 major = GSS_S_CRED_UNAVAIL;
 319     krb5_context krbContext = NULL;
 320     krb5_error_code code = 0;
 321     krb5_ccache ccache = NULL;
 322     krb5_creds match = { 0 };
 323     krb5_creds creds = { 0 };
 324
 325     GSSEAP_KRB_INIT(&krbContext);
 326
 327     assert(cred != GSS_C_NO_CREDENTIAL);
 328     assert(target != GSS_C_NO_NAME);
 329
 330     if (cred->name == GSS_C_NO_NAME ||
 331         !reauthUseCredsCache(krbContext, cred->name->krbPrincipal))
 332         goto cleanup;
 333
 334     match.client = cred->name->krbPrincipal;
 335     match.server = target->krbPrincipal;
 336     if (timeReq != 0 && timeReq != GSS_C_INDEFINITE)
 337         match.times.endtime = now + timeReq;
 338
 339     code = krb5_cc_default(krbContext, &ccache);
 340     if (code != 0)
 341         goto cleanup;
 342
 343     code = krb5_cc_retrieve_cred(krbContext, ccache, 0, &match, &creds);
 344     if (code != 0)
 345         goto cleanup;
 346
 347     cred->flags |= CRED_FLAG_DEFAULT_CCACHE;
 348     cred->krbCredCache = ccache;
 349     ccache = NULL;
 350
 351     major = gss_krb5_import_cred(minor, cred->krbCredCache, NULL, NULL,
 352                                  &cred->krbCred);
 353
 354 cleanup:
 355     if (major == GSS_S_CRED_UNAVAIL)
 356         *minor = code;
 357
 358     if (ccache != NULL)
 359         krb5_cc_close(krbContext, ccache);
 360     krb5_free_cred_contents(krbContext, &creds);
 361
 362     return major;
 363 }
 364
 365 /*
 366  * Returns TRUE if the credential handle's reauth credentials are
 367  * valid or if we can use the default credentials cache. Credentials
 368  * handle must be locked.
 369  */
 370 int
 371 gssEapCanReauthP(gss_cred_id_t cred,
 372                  gss_name_t target,
 373                  OM_uint32 timeReq)
 374 {
 375     time_t now, expiryReq;
 376     OM_uint32 minor;
 377
 378     assert(cred != GSS_C_NO_CREDENTIAL);
 379
 380     now = time(NULL);
 381     expiryReq = now;
 382     if (timeReq != GSS_C_INDEFINITE)
 383         expiryReq += timeReq;
 384
 385     if (cred->krbCredCache != NULL && cred->expiryTime > expiryReq)
 386         return TRUE;
 387
 388     if (getDefaultReauthCredentials(&minor, cred, target,
 389                                     now, timeReq) == GSS_S_COMPLETE)
 390         return TRUE;
 391
 392     return FALSE;
 393 }
 394
 395 /*
 396  * Store re-authentication (Kerberos) credentials in a credential handle.
 397  * Credentials handle must be locked.
 398  */
 399 OM_uint32
 400 gssEapStoreReauthCreds(OM_uint32 *minor,
 401                        gss_ctx_id_t ctx,
 402                        gss_cred_id_t cred,
 403                        gss_buffer_t credBuf)
 404 {
 405     OM_uint32 major = GSS_S_COMPLETE;
 406     krb5_error_code code;
 407     krb5_context krbContext = NULL;
 408     krb5_auth_context authContext = NULL;
 409     krb5_data credData = { 0 };
 410     krb5_creds **creds = NULL;
 411     krb5_principal canonPrinc;
 412     krb5_principal ccPrinc = NULL;
 413     int i;
 414
 415     if (credBuf->length == 0 || cred == GSS_C_NO_CREDENTIAL)
 416         return GSS_S_COMPLETE;
 417
 418     GSSEAP_KRB_INIT(&krbContext);
 419
 420     code = krb5_auth_con_init(krbContext, &authContext);
 421     if (code != 0)
 422         goto cleanup;
 423
 424     code = krb5_auth_con_setflags(krbContext, authContext, 0);
 425     if (code != 0)
 426         goto cleanup;
 427
 428     code = krb5_auth_con_setrecvsubkey(krbContext, authContext,
 429                                        &ctx->rfc3961Key);
 430     if (code != 0)
 431         goto cleanup;
 432
 433     gssBufferToKrbData(credBuf, &credData);
 434
 435     code = krb5_rd_cred(krbContext, authContext, &credData, &creds, NULL);
 436     if (code != 0)
 437         goto cleanup;
 438
 439     if (creds == NULL || creds[0] == NULL)
 440         goto cleanup;
 441
 442     code = krb5_copy_principal(krbContext, creds[0]->client, &canonPrinc);
 443     if (code != 0)
 444         goto cleanup;
 445
 446     krb5_free_principal(krbContext, cred->name->krbPrincipal);
 447     cred->name->krbPrincipal = canonPrinc;
 448
 449     if (creds[0]->times.endtime == KRB5_INT32_MAX)
 450         cred->expiryTime = 0;
 451     else
 452         cred->expiryTime = creds[0]->times.endtime;
 453
 454     if (cred->krbCredCache == NULL) {
 455         if (reauthUseCredsCache(krbContext, creds[0]->client) &&
 456             krb5_cc_default(krbContext, &cred->krbCredCache) == 0)
 457             cred->flags |= CRED_FLAG_DEFAULT_CCACHE;
 458     } else {
 459         /*
 460          * If we already have an associated credentials cache, possibly from
 461          * the last time we stored a reauthentication credential, then we
 462          * need to clear it out and release the associated GSS credential.
 463          */
 464         if (cred->flags & CRED_FLAG_DEFAULT_CCACHE) {
 465             krb5_cc_remove_cred(krbContext, cred->krbCredCache, 0, creds[0]);
 466         } else {
 467             krb5_cc_destroy(krbContext, cred->krbCredCache);
 468             cred->krbCredCache = NULL;
 469         }
 470         gssReleaseCred(minor, &cred->krbCred);
 471     }
 472
 473     if (cred->krbCredCache == NULL) {
 474         code = krb5_cc_new_unique(krbContext, "MEMORY", NULL, &cred->krbCredCache);
 475         if (code != 0)
 476             goto cleanup;
 477     }
 478
 479     if ((cred->flags & CRED_FLAG_DEFAULT_CCACHE) == 0 ||
 480         krb5_cc_get_principal(krbContext, cred->krbCredCache, &ccPrinc) != 0) {
 481         code = krb5_cc_initialize(krbContext, cred->krbCredCache,
 482                                   creds[0]->client);
 483         if (code != 0)
 484             goto cleanup;
 485     }
 486
 487     for (i = 0; creds[i] != NULL; i++) {
 488         krb5_creds kcred = *(creds[i]);
 489
 490         /*
 491          * Swap in the acceptor name the client asked for so
 492          * get_credentials() works. We're making the assumption that
 493          * any service tickets returned are for us. We'll need to
 494          * reflect some more on whether that is a safe assumption.
 495          */
 496         if (!isTicketGrantingServiceP(krbContext, kcred.server))
 497             kcred.server = ctx->acceptorName->krbPrincipal;
 498
 499         code = krb5_cc_store_cred(krbContext, cred->krbCredCache, &kcred);
 500         if (code != 0)
 501             goto cleanup;
 502     }
 503
 504     major = gss_krb5_import_cred(minor, cred->krbCredCache, NULL, NULL,
 505                                  &cred->krbCred);
 506     if (GSS_ERROR(major))
 507         goto cleanup;
 508
 509 cleanup:
 510     *minor = code;
 511
 512     krb5_free_principal(krbContext, ccPrinc);
 513     krb5_auth_con_free(krbContext, authContext);
 514     if (creds != NULL) {
 515         for (i = 0; creds[i] != NULL; i++)
 516             krb5_free_creds(krbContext, creds[i]);
 517         GSSEAP_FREE(creds);
 518     }
 519     if (major == GSS_S_COMPLETE)
 520         major = *minor ? GSS_S_FAILURE : GSS_S_COMPLETE;
 521
 522     return major;
 523 }
 524
 525 static gss_buffer_desc radiusAvpKrbAttr = {
 526     sizeof("urn:authdata-radius-avp") - 1, "urn:authdata-radius-avp"
 527 };
 528
 529 /*
 530  * Unfortunately extracting an AD-KDCIssued authorization data element
 531  * is pretty implementation-dependent. It's not possible to verify the
 532  * signature ourselves because the ticket session key is not exposed
 533  * outside GSS. In an ideal world, all AD-KDCIssued elements would be
 534  * verified by the Kerberos library and authentication would fail if
 535  * verification failed. We're not quite there yet and as a result have
 536  * to go through some hoops to get this to work. The alternative would
 537  * be to sign the authorization data with our long-term key, but it
 538  * seems a pity to compromise the design because of current implementation
 539  * limitations.
 540  *
 541  * (Specifically, the hoops involve a libkrb5 authorisation data plugin
 542  * that exposes the verified and serialised attribute context through
 543  * the Kerberos GSS mechanism's naming extensions API.)
 544  */
 545 static OM_uint32
 546 defrostAttrContext(OM_uint32 *minor,
 547                    gss_name_t glueName,
 548                    gss_name_t mechName)
 549 {
 550     OM_uint32 major, tmpMinor;
 551     gss_buffer_desc authData = GSS_C_EMPTY_BUFFER;
 552     gss_buffer_desc authDataDisplay = GSS_C_EMPTY_BUFFER;
 553     int more = -1;
 554     int authenticated, complete;
 555
 556     major = gssGetNameAttribute(minor, glueName, &radiusAvpKrbAttr,
 557                                 &authenticated, &complete,
 558                                 &authData, &authDataDisplay, &more);
 559     if (major == GSS_S_COMPLETE) {
 560         if (authenticated == 0)
 561             major = GSS_S_BAD_NAME;
 562         else
 563             major = gssEapImportAttrContext(minor, &authData, mechName);
 564     } else if (major == GSS_S_UNAVAILABLE) {
 565         major = GSS_S_COMPLETE;
 566     }
 567
 568     gss_release_buffer(&tmpMinor, &authData);
 569     gss_release_buffer(&tmpMinor, &authDataDisplay);
 570
 571     return major;
 572 }
 573
 574 /*
 575  * Convert a mechanism glue to an EAP mechanism name by displaying and
 576  * importing it. This also handles the RADIUS attributes.
 577  */
 578 OM_uint32
 579 gssEapGlueToMechName(OM_uint32 *minor,
 580                      gss_name_t glueName,
 581                      gss_name_t *pMechName)
 582 {
 583     OM_uint32 major, tmpMinor;
 584     gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
 585
 586     *pMechName = GSS_C_NO_NAME;
 587
 588     major = gssDisplayName(minor, glueName, &nameBuf, NULL);
 589     if (GSS_ERROR(major))
 590         goto cleanup;
 591
 592     major = gssEapImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
 593                              pMechName);
 594     if (GSS_ERROR(major))
 595         goto cleanup;
 596
 597     major = defrostAttrContext(minor, glueName, *pMechName);
 598     if (GSS_ERROR(major))
 599         goto cleanup;
 600
 601 cleanup:
 602     if (GSS_ERROR(major)) {
 603         gssReleaseName(&tmpMinor, pMechName);
 604         *pMechName = GSS_C_NO_NAME;
 605     }
 606
 607     gss_release_buffer(&tmpMinor, &nameBuf);
 608
 609     return major;
 610 }
 611
 612 /*
 613  * Convert an EAP mechanism name to a mechanism glue name by displaying
 614  * and importing it.
 615  */
 616 OM_uint32
 617 gssEapMechToGlueName(OM_uint32 *minor,
 618                      gss_name_t mechName,
 619                      gss_name_t *pGlueName)
 620 {
 621     OM_uint32 major, tmpMinor;
 622     gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
 623
 624     *pGlueName = GSS_C_NO_NAME;
 625
 626     major = gssEapDisplayName(minor, mechName, &nameBuf, NULL);
 627     if (GSS_ERROR(major))
 628         goto cleanup;
 629
 630     major = gssImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
 631                           pGlueName);
 632     if (GSS_ERROR(major))
 633         goto cleanup;
 634
 635 cleanup:
 636     gss_release_buffer(&tmpMinor, &nameBuf);
 637
 638     return major;
 639 }
 640
 641 /*
 642  * Suck out the analgous elements of a Kerberos GSS context into an EAP
 643  * one so that the application doesn't know the difference.
 644  */
 645 OM_uint32
 646 gssEapReauthComplete(OM_uint32 *minor,
 647                     gss_ctx_id_t ctx,
 648                     gss_cred_id_t cred,
 649                     const gss_OID mech,
 650                     OM_uint32 timeRec)
 651 {
 652     OM_uint32 major, tmpMinor;
 653     gss_buffer_set_t keyData = GSS_C_NO_BUFFER_SET;
 654
 655     if (!oidEqual(mech, gss_mech_krb5)) {
 656         major = GSS_S_BAD_MECH;
 657         goto cleanup;
 658     }
 659
 660     /* Get the raw subsession key and encryption type*/
 661     major = gssInquireSecContextByOid(minor, ctx->kerberosCtx,
 662                                       GSS_C_INQ_SSPI_SESSION_KEY, &keyData);
 663     if (GSS_ERROR(major))
 664         goto cleanup;
 665
 666     {
 667         gss_OID_desc oid;
 668         int suffix;
 669
 670         oid.length = keyData->elements[1].length;
 671         oid.elements = keyData->elements[1].value;
 672
 673         /* GSS_KRB5_SESSION_KEY_ENCTYPE_OID */
 674         major = decomposeOid(minor,
 675                              "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02\x04",
 676                              10, &oid, &suffix);
 677         if (GSS_ERROR(major))
 678             goto cleanup;
 679
 680         ctx->encryptionType = suffix;
 681     }
 682
 683     {
 684         krb5_context krbContext = NULL;
 685         krb5_keyblock key;
 686
 687         GSSEAP_KRB_INIT(&krbContext);
 688
 689         KRB_KEY_LENGTH(&key) = keyData->elements[0].length;
 690         KRB_KEY_DATA(&key)   = keyData->elements[0].value;
 691         KRB_KEY_TYPE(&key)   = ctx->encryptionType;
 692
 693         *minor = krb5_copy_keyblock_contents(krbContext,
 694                                              &key, &ctx->rfc3961Key);
 695         if (*minor != 0) {
 696             major = GSS_S_FAILURE;
 697             goto cleanup;
 698         }
 699     }
 700
 701     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 702                                       &ctx->checksumType);
 703     if (GSS_ERROR(major))
 704         goto cleanup;
 705
 706     if (timeRec != GSS_C_INDEFINITE)
 707         ctx->expiryTime = time(NULL) + timeRec;
 708
 709     /* Initialize our sequence state */
 710     major = sequenceInit(minor,
 711                          &ctx->seqState, ctx->recvSeq,
 712                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 713                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 714                          TRUE);
 715     if (GSS_ERROR(major))
 716         goto cleanup;
 717
 718     major = GSS_S_COMPLETE;
 719
 720 cleanup:
 721     gss_release_buffer_set(&tmpMinor, &keyData);
 722
 723     return major;
 724 }
 725
 726 /*
 727  * The remainder of this file consists of wrappers so we can call into the
 728  * mechanism glue without calling ourselves.
 729  */
 730 static OM_uint32
 731 (*gssInitSecContextNext)(OM_uint32 *,
 732                          gss_cred_id_t,
 733                          gss_ctx_id_t *,
 734                          gss_name_t,
 735                          gss_OID,
 736                          OM_uint32,
 737                          OM_uint32,
 738                          gss_channel_bindings_t,
 739                          gss_buffer_t,
 740                          gss_OID *,
 741                          gss_buffer_t,
 742                          OM_uint32 *,
 743                          OM_uint32 *);
 744
 745 static OM_uint32
 746 (*gssAcceptSecContextNext)(OM_uint32 *,
 747                            gss_ctx_id_t *,
 748                            gss_cred_id_t,
 749                            gss_buffer_t,
 750                            gss_channel_bindings_t,
 751                            gss_name_t *,
 752                            gss_OID *,
 753                            gss_buffer_t,
 754                            OM_uint32 *,
 755                            OM_uint32 *,
 756                            gss_cred_id_t *);
 757
 758 static OM_uint32
 759 (*gssReleaseCredNext)(OM_uint32 *, gss_cred_id_t *);
 760
 761 static OM_uint32
 762 (*gssReleaseNameNext)(OM_uint32 *, gss_name_t *);
 763
 764 static OM_uint32
 765 (*gssInquireSecContextByOidNext)(OM_uint32 *,
 766                                  const gss_ctx_id_t,
 767                                  const gss_OID,
 768                                  gss_buffer_set_t *);
 769
 770 static OM_uint32
 771 (*gssDeleteSecContextNext)(OM_uint32 *,
 772                           gss_ctx_id_t *,
 773                           gss_buffer_t);
 774
 775 static OM_uint32
 776 (*gssDisplayNameNext)(OM_uint32 *,
 777                       gss_name_t,
 778                       gss_buffer_t,
 779                       gss_OID *);
 780
 781 static OM_uint32
 782 (*gssImportNameNext)(OM_uint32 *,
 783                      gss_buffer_t,
 784                      gss_OID,
 785                      gss_name_t *);
 786
 787 static OM_uint32
 788 (*gssStoreCredNext)(OM_uint32 *,
 789                     const gss_cred_id_t,
 790                     gss_cred_usage_t,
 791                     const gss_OID,
 792                     OM_uint32,
 793                     OM_uint32,
 794                     gss_OID_set *,
 795                     gss_cred_usage_t *);
 796
 797 static OM_uint32
 798 (*gssGetNameAttributeNext)(OM_uint32 *,
 799                           gss_name_t,
 800                           gss_buffer_t,
 801                           int *,
 802                           int *,
 803                           gss_buffer_t,
 804                           gss_buffer_t,
 805                           int *);
 806
 807 #define NEXT_SYMBOL(local, global)  do {        \
 808         ((local) = dlsym(RTLD_NEXT, (global))); \
 809         if ((local) == NULL) {                  \
 810             *minor = GSSEAP_NO_MECHGLUE_SYMBOL; \
 811             major = GSS_S_UNAVAILABLE;          \
 812             /* but continue */                  \
 813         }                                       \
 814     } while (0)
 815
 816 OM_uint32
 817 gssEapReauthInitialize(OM_uint32 *minor)
 818 {
 819     OM_uint32 major = GSS_S_COMPLETE;
 820
 821     NEXT_SYMBOL(gssInitSecContextNext,         "gss_init_sec_context");
 822     NEXT_SYMBOL(gssAcceptSecContextNext,       "gss_accept_sec_context");
 823     NEXT_SYMBOL(gssReleaseCredNext,            "gss_release_cred");
 824     NEXT_SYMBOL(gssReleaseNameNext,            "gss_release_name");
 825     NEXT_SYMBOL(gssInquireSecContextByOidNext, "gss_inquire_sec_context_by_oid");
 826     NEXT_SYMBOL(gssDeleteSecContextNext,       "gss_delete_sec_context");
 827     NEXT_SYMBOL(gssDisplayNameNext,            "gss_display_name");
 828     NEXT_SYMBOL(gssImportNameNext,             "gss_import_name");
 829     NEXT_SYMBOL(gssStoreCredNext,              "gss_store_cred");
 830     NEXT_SYMBOL(gssGetNameAttributeNext,       "gss_get_name_attribute");
 831
 832     return major;
 833 }
 834
 835 OM_uint32
 836 gssInitSecContext(OM_uint32 *minor,
 837                   gss_cred_id_t cred,
 838                   gss_ctx_id_t *context_handle,
 839                   gss_name_t target_name,
 840                   gss_OID mech_type,
 841                   OM_uint32 req_flags,
 842                   OM_uint32 time_req,
 843                   gss_channel_bindings_t input_chan_bindings,
 844                   gss_buffer_t input_token,
 845                   gss_OID *actual_mech_type,
 846                   gss_buffer_t output_token,
 847                   OM_uint32 *ret_flags,
 848                   OM_uint32 *time_rec)
 849 {
 850     if (gssInitSecContextNext == NULL) {
 851         *minor = GSSEAP_NO_MECHGLUE_SYMBOL;
 852         return GSS_S_UNAVAILABLE;
 853     }
 854
 855     return gssInitSecContextNext(minor, cred, context_handle,
 856                                  target_name, mech_type, req_flags,
 857                                  time_req, input_chan_bindings,
 858                                  input_token, actual_mech_type,
 859                                  output_token, ret_flags, time_rec);
 860 }
 861
 862 OM_uint32
 863 gssAcceptSecContext(OM_uint32 *minor,
 864                     gss_ctx_id_t *context_handle,
 865                     gss_cred_id_t cred,
 866                     gss_buffer_t input_token,
 867                     gss_channel_bindings_t input_chan_bindings,
 868                     gss_name_t *src_name,
 869                     gss_OID *mech_type,
 870                     gss_buffer_t output_token,
 871                     OM_uint32 *ret_flags,
 872                     OM_uint32 *time_rec,
 873                     gss_cred_id_t *delegated_cred_handle)
 874 {
 875     if (gssAcceptSecContextNext == NULL) {
 876         *minor = GSSEAP_NO_MECHGLUE_SYMBOL;
 877         return GSS_S_UNAVAILABLE;
 878     }
 879
 880     return gssAcceptSecContextNext(minor, context_handle, cred,
 881                                    input_token, input_chan_bindings,
 882                                    src_name, mech_type, output_token,
 883                                    ret_flags, time_rec, delegated_cred_handle);
 884 }
 885
 886 OM_uint32
 887 gssReleaseCred(OM_uint32 *minor,
 888                gss_cred_id_t *cred_handle)
 889 {
 890     if (gssReleaseCredNext == NULL) {
 891         *minor = GSSEAP_NO_MECHGLUE_SYMBOL;
 892         return GSS_S_UNAVAILABLE;
 893     }
 894
 895     return gssReleaseCredNext(minor, cred_handle);
 896 }
 897
 898 OM_uint32
 899 gssReleaseName(OM_uint32 *minor,
 900                gss_name_t *name)
 901 {
 902     if (gssReleaseName == NULL) {
 903         *minor = GSSEAP_NO_MECHGLUE_SYMBOL;
 904         return GSS_S_UNAVAILABLE;
 905     }
 906
 907     return gssReleaseNameNext(minor, name);
 908 }
 909
 910 OM_uint32
 911 gssDeleteSecContext(OM_uint32 *minor,
 912                     gss_ctx_id_t *context_handle,
 913                     gss_buffer_t output_token)
 914 {
 915     if (gssDeleteSecContextNext == NULL) {
 916         *minor = GSSEAP_NO_MECHGLUE_SYMBOL;
 917         return GSS_S_UNAVAILABLE;
 918     }
 919
 920     return gssDeleteSecContextNext(minor, context_handle, output_token);
 921 }
 922
 923 static OM_uint32
 924 gssDisplayName(OM_uint32 *minor,
 925                gss_name_t name,
 926                gss_buffer_t buffer,
 927                gss_OID *name_type)
 928 {
 929     if (gssDisplayNameNext == NULL) {
 930         *minor = GSSEAP_NO_MECHGLUE_SYMBOL;
 931         return GSS_S_UNAVAILABLE;
 932     }
 933
 934     return gssDisplayNameNext(minor, name, buffer, name_type);
 935 }
 936
 937 static OM_uint32
 938 gssImportName(OM_uint32 *minor,
 939               gss_buffer_t buffer,
 940               gss_OID name_type,
 941               gss_name_t *name)
 942 {
 943     if (gssImportNameNext == NULL) {
 944         *minor = GSSEAP_NO_MECHGLUE_SYMBOL;
 945         return GSS_S_UNAVAILABLE;
 946     }
 947
 948     return gssImportNameNext(minor, buffer, name_type, name);
 949 }
 950
 951 OM_uint32
 952 gssInquireSecContextByOid(OM_uint32 *minor,
 953                           const gss_ctx_id_t context_handle,
 954                           const gss_OID desired_object,
 955                           gss_buffer_set_t *data_set)
 956 {
 957     if (gssInquireSecContextByOidNext == NULL) {
 958         *minor = GSSEAP_NO_MECHGLUE_SYMBOL;
 959         return GSS_S_UNAVAILABLE;
 960     }
 961
 962     return gssInquireSecContextByOidNext(minor, context_handle,
 963                                          desired_object, data_set);
 964 }
 965
 966 OM_uint32
 967 gssStoreCred(OM_uint32 *minor,
 968              const gss_cred_id_t input_cred_handle,
 969              gss_cred_usage_t input_usage,
 970              const gss_OID desired_mech,
 971              OM_uint32 overwrite_cred,
 972              OM_uint32 default_cred,
 973              gss_OID_set *elements_stored,
 974              gss_cred_usage_t *cred_usage_stored)
 975 {
 976     if (gssStoreCredNext == NULL) {
 977         *minor = GSSEAP_NO_MECHGLUE_SYMBOL;
 978         return GSS_S_UNAVAILABLE;
 979     }
 980
 981     return gssStoreCredNext(minor, input_cred_handle, input_usage,
 982                             desired_mech, overwrite_cred, default_cred,
 983                             elements_stored, cred_usage_stored);
 984 }
 985
 986 OM_uint32
 987 gssGetNameAttribute(OM_uint32 *minor,
 988                     gss_name_t name,
 989                     gss_buffer_t attr,
 990                     int *authenticated,
 991                     int *complete,
 992                     gss_buffer_t value,
 993                     gss_buffer_t display_value,
 994                     int *more)
 995 {
 996     if (gssGetNameAttributeNext == NULL) {
 997         *minor = GSSEAP_NO_MECHGLUE_SYMBOL;
 998         return GSS_S_UNAVAILABLE;
 999     }
1000
1001     return gssGetNameAttributeNext(minor, name, attr, authenticated, complete,
1002                                    value, display_value, more);
1003 }