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 krb5_error_code
  48 getAcceptorKey(krb5_context krbContext,
  49                gss_ctx_id_t ctx,
  50                gss_cred_id_t cred,
  51                krb5_principal *princ,
  52                krb5_keyblock *key)
  53 {
  54     krb5_error_code code;
  55     krb5_keytab keytab = NULL;
  56     krb5_keytab_entry ktent;
  57     krb5_kt_cursor cursor = NULL;
  58
  59     *princ = NULL;
  60     memset(key, 0, sizeof(*key));
  61     memset(&ktent, 0, sizeof(ktent));
  62
  63     code = krb5_kt_default(krbContext, &keytab);
  64     if (code != 0)
  65         goto cleanup;
  66
  67     if (cred != GSS_C_NO_CREDENTIAL && cred->name != GSS_C_NO_NAME) {
  68         code = krb5_kt_get_entry(krbContext, keytab,
  69                                  cred->name->krbPrincipal, 0,
  70                                  ctx->encryptionType, &ktent);
  71         if (code != 0)
  72             goto cleanup;
  73     } else {
  74         code = krb5_kt_start_seq_get(krbContext, keytab, &cursor);
  75         if (code != 0)
  76             goto cleanup;
  77
  78         while ((code = krb5_kt_next_entry(krbContext, keytab,
  79                                           &ktent, &cursor)) == 0) {
  80             if (ktent.key.enctype == ctx->encryptionType) {
  81                 break;
  82             } else {
  83                 krb5_free_keytab_entry_contents(krbContext, &ktent);
  84             }
  85         }
  86     }
  87
  88     if (code == 0) {
  89         *princ = ktent.principal;
  90         *key = ktent.key;
  91     }
  92
  93 cleanup:
  94     if (cred == GSS_C_NO_CREDENTIAL || cred->name == GSS_C_NO_NAME)
  95         krb5_kt_end_seq_get(krbContext, keytab, &cursor);
  96     krb5_kt_close(krbContext, keytab);
  97
  98     if (code != 0) {
  99         if (*princ != NULL) {
 100             krb5_free_principal(krbContext, *princ);
 101             *princ = NULL;
 102         }
 103         krb5_free_keyblock_contents(krbContext, key),
 104         memset(key, 0, sizeof(key));
 105     }
 106
 107     return code;
 108 }
 109
 110 OM_uint32
 111 gssEapMakeReauthCreds(OM_uint32 *minor,
 112                       gss_ctx_id_t ctx,
 113                       gss_cred_id_t cred,
 114                       gss_buffer_t credBuf)
 115 {
 116     OM_uint32 major = GSS_S_COMPLETE;
 117     krb5_error_code code;
 118     krb5_context krbContext = NULL;
 119     krb5_ticket ticket = { 0 };
 120     krb5_keyblock session = { 0 }, acceptorKey = { 0 };
 121     krb5_enc_tkt_part enc_part = { 0 };
 122     gss_buffer_desc attrBuf = GSS_C_EMPTY_BUFFER;
 123     krb5_authdata *authData[2], authDatum = { 0 };
 124     krb5_data *ticketData = NULL, *credsData = NULL;
 125     krb5_creds creds = { 0 };
 126     krb5_auth_context authContext = NULL;
 127
 128     credBuf->length = 0;
 129     credBuf->value = NULL;
 130
 131     GSSEAP_KRB_INIT(&krbContext);
 132
 133     code = getAcceptorKey(krbContext, ctx, cred,
 134                           &ticket.server, &acceptorKey);
 135     if (code == KRB5_KT_NOTFOUND) {
 136         gss_buffer_desc emptyToken = { 0, "" };
 137
 138         /*
 139          * If we can't produce the KRB-CRED message, we need to
 140          * return an empty (not NULL) token to the caller so we
 141          * don't change the number of authentication legs.
 142          */
 143         return duplicateBuffer(minor, &emptyToken, credBuf);
 144     } else if (code != 0)
 145         goto cleanup;
 146
 147     enc_part.flags = TKT_FLG_INITIAL;
 148
 149     code = krb5_c_make_random_key(krbContext, ctx->encryptionType,
 150                                   &session);
 151     if (code != 0)
 152         goto cleanup;
 153
 154     enc_part.session = &session;
 155     enc_part.client = ctx->initiatorName->krbPrincipal;
 156     enc_part.times.authtime = time(NULL);
 157     enc_part.times.starttime = enc_part.times.authtime;
 158     enc_part.times.endtime = ctx->expiryTime
 159                              ? ctx->expiryTime
 160                              : KRB5_INT32_MAX;
 161     enc_part.times.renew_till = 0;
 162
 163     major = gssEapExportAttrContext(minor, ctx->initiatorName,
 164                                     &attrBuf);
 165     if (GSS_ERROR(major))
 166         goto cleanup;
 167
 168     authDatum.ad_type = KRB5_AUTHDATA_RADIUS_AVP;
 169     authDatum.length = attrBuf.length;
 170     authDatum.contents = attrBuf.value;
 171     authData[0] = &authDatum;
 172     authData[1] = NULL;
 173
 174     code = krb5_make_authdata_kdc_issued(krbContext, &session,
 175                                          ticket.server, authData,
 176                                          &enc_part.authorization_data);
 177     if (code != 0)
 178         goto cleanup;
 179
 180     ticket.enc_part2 = &enc_part;
 181
 182     code = krb5_encrypt_tkt_part(krbContext, &acceptorKey, &ticket);
 183     if (code != 0)
 184         goto cleanup;
 185
 186     code = encode_krb5_ticket(&ticket, &ticketData);
 187     if (code != 0)
 188         goto cleanup;
 189
 190     creds.client = enc_part.client;
 191     creds.server = ticket.server;
 192     creds.keyblock = session;
 193     creds.times = enc_part.times;
 194     creds.ticket_flags = enc_part.flags;
 195     creds.ticket = *ticketData;
 196     creds.authdata = authData;
 197
 198     code = krb5_auth_con_init(krbContext, &authContext);
 199     if (code != 0)
 200         goto cleanup;
 201
 202     code = krb5_auth_con_setflags(krbContext, authContext, 0);
 203     if (code != 0)
 204         goto cleanup;
 205
 206     code = krb5_auth_con_setsendsubkey(krbContext, authContext,
 207                                        &ctx->rfc3961Key);
 208     if (code != 0)
 209         goto cleanup;
 210
 211     code = krb5_mk_1cred(krbContext, authContext, &creds, &credsData, NULL);
 212     if (code != 0)
 213         goto cleanup;
 214
 215     krbDataToGssBuffer(credsData, credBuf);
 216
 217 cleanup:
 218     if (ticket.enc_part.ciphertext.data != NULL)
 219         GSSEAP_FREE(ticket.enc_part.ciphertext.data);
 220     krb5_free_keyblock_contents(krbContext, &session);
 221     krb5_free_keyblock_contents(krbContext, &acceptorKey);
 222     gss_release_buffer(minor, &attrBuf);
 223     krb5_free_data(krbContext, ticketData);
 224     krb5_auth_con_free(krbContext, authContext);
 225     krb5_free_authdata(krbContext, enc_part.authorization_data);
 226     if (credsData != NULL)
 227         GSSEAP_FREE(credsData);
 228
 229     if (major == GSS_S_COMPLETE) {
 230         *minor = code;
 231         major = code != 0 ? GSS_S_FAILURE : GSS_S_COMPLETE;
 232     }
 233
 234     return major;
 235 }
 236
 237 static int
 238 isTicketGrantingServiceP(krb5_context krbContext,
 239                          krb5_const_principal principal)
 240 {
 241     if (krb5_princ_size(krbContext, principal) == 2 &&
 242         krb5_princ_component(krbContext, principal, 0)->length == 6 &&
 243         memcmp(krb5_princ_component(krbContext, principal, 0)->data, "krbtgt", 6) == 0)
 244         return TRUE;
 245
 246     return FALSE;
 247 }
 248
 249 OM_uint32
 250 gssEapStoreReauthCreds(OM_uint32 *minor,
 251                        gss_ctx_id_t ctx,
 252                        gss_cred_id_t cred,
 253                        gss_buffer_t credBuf)
 254 {
 255     OM_uint32 major = GSS_S_COMPLETE, code;
 256     krb5_context krbContext = NULL;
 257     krb5_auth_context authContext = NULL;
 258     krb5_data credData = { 0 };
 259     krb5_creds **creds = NULL;
 260     krb5_principal canonPrinc;
 261     int i;
 262
 263     if (credBuf->length == 0 || cred == GSS_C_NO_CREDENTIAL)
 264         return GSS_S_COMPLETE;
 265
 266     GSSEAP_KRB_INIT(&krbContext);
 267
 268     code = krb5_auth_con_init(krbContext, &authContext);
 269     if (code != 0)
 270         goto cleanup;
 271
 272     code = krb5_auth_con_setflags(krbContext, authContext, 0);
 273     if (code != 0)
 274         goto cleanup;
 275
 276     code = krb5_auth_con_setrecvsubkey(krbContext, authContext,
 277                                        &ctx->rfc3961Key);
 278     if (code != 0)
 279         goto cleanup;
 280
 281     gssBufferToKrbData(credBuf, &credData);
 282
 283     code = krb5_rd_cred(krbContext, authContext, &credData, &creds, NULL);
 284     if (code != 0)
 285         goto cleanup;
 286
 287     if (creds == NULL || creds[0] == NULL)
 288         goto cleanup;
 289
 290     code = krb5_copy_principal(krbContext, creds[0]->client, &canonPrinc);
 291     if (code != 0)
 292         goto cleanup;
 293
 294     krb5_free_principal(krbContext, cred->name->krbPrincipal);
 295     cred->name->krbPrincipal = canonPrinc;
 296
 297     cred->expiryTime = creds[0]->times.endtime;
 298
 299     code = krb5_cc_new_unique(krbContext, "MEMORY", NULL, &cred->krbCredCache);
 300     if (code != 0)
 301         goto cleanup;
 302
 303     code = krb5_cc_initialize(krbContext, cred->krbCredCache,
 304                               creds[0]->client);
 305     if (code != 0)
 306         goto cleanup;
 307
 308     for (i = 0; creds[i] != NULL; i++) {
 309         krb5_creds kcred = *(creds[i]);
 310
 311         /*
 312          * Swap in the acceptor name the client asked for so
 313          * get_credentials() works
 314          */
 315         if (!isTicketGrantingServiceP(krbContext, kcred.server))
 316             kcred.server = ctx->acceptorName->krbPrincipal;
 317
 318         code = krb5_cc_store_cred(krbContext, cred->krbCredCache, &kcred);
 319         if (code != 0)
 320             goto cleanup;
 321     }
 322
 323     major = gss_krb5_import_cred(minor, cred->krbCredCache, NULL, NULL,
 324                                  &cred->krbCred);
 325     if (GSS_ERROR(major))
 326         goto cleanup;
 327
 328 cleanup:
 329     *minor = code;
 330
 331     krb5_auth_con_free(krbContext, authContext);
 332     if (creds != NULL) {
 333         for (i = 0; creds[i] != NULL; i++)
 334             krb5_free_creds(krbContext, creds[i]);
 335     }
 336     if (major == GSS_S_COMPLETE)
 337         major = *minor ? GSS_S_FAILURE : GSS_S_COMPLETE;
 338
 339     return major;
 340 }
 341
 342 static OM_uint32 (*gssInitSecContextNext)(
 343     OM_uint32 *minor,
 344     gss_cred_id_t cred,
 345     gss_ctx_id_t *context_handle,
 346     gss_name_t target_name,
 347     gss_OID mech_type,
 348     OM_uint32 req_flags,
 349     OM_uint32 time_req,
 350     gss_channel_bindings_t input_chan_bindings,
 351     gss_buffer_t input_token,
 352     gss_OID *actual_mech_type,
 353     gss_buffer_t output_token,
 354     OM_uint32 *ret_flags,
 355     OM_uint32 *time_rec);
 356
 357 static OM_uint32 (*gssAcceptSecContextNext)(
 358     OM_uint32 *minor,
 359     gss_ctx_id_t *context_handle,
 360     gss_cred_id_t cred,
 361     gss_buffer_t input_token,
 362     gss_channel_bindings_t input_chan_bindings,
 363     gss_name_t *src_name,
 364     gss_OID *mech_type,
 365     gss_buffer_t output_token,
 366     OM_uint32 *ret_flags,
 367     OM_uint32 *time_rec,
 368     gss_cred_id_t *delegated_cred_handle);
 369
 370 static OM_uint32 (*gssReleaseCredNext)(
 371     OM_uint32 *minor,
 372     gss_cred_id_t *cred_handle);
 373
 374 static OM_uint32 (*gssReleaseNameNext)(
 375     OM_uint32 *minor,
 376     gss_name_t *name);
 377
 378 static OM_uint32 (*gssInquireSecContextByOidNext)(
 379     OM_uint32 *minor,
 380     const gss_ctx_id_t context_handle,
 381     const gss_OID desired_object,
 382     gss_buffer_set_t *data_set);
 383
 384 static OM_uint32 (*gssDeleteSecContextNext)(
 385     OM_uint32 *minor,
 386     gss_ctx_id_t *context_handle,
 387     gss_buffer_t output_token);
 388
 389 static OM_uint32 (*gssDisplayNameNext)(
 390     OM_uint32 *minor,
 391     gss_name_t name,
 392     gss_buffer_t output_name_buffer,
 393     gss_OID *output_name_type);
 394
 395 static OM_uint32 (*gssImportNameNext)(
 396     OM_uint32 *minor,
 397     gss_buffer_t buffer,
 398     gss_OID nameType,
 399     gss_name_t *outputName);
 400
 401 static OM_uint32 (*gssKrbExtractAuthzDataFromSecContextNext)(
 402     OM_uint32 *minor,
 403     const gss_ctx_id_t context_handle,
 404     int ad_type,
 405     gss_buffer_t ad_data);
 406
 407 static OM_uint32 (*gssStoreCredNext)(
 408     OM_uint32 *minor,
 409     const gss_cred_id_t input_cred_handle,
 410     gss_cred_usage_t input_usage,
 411     const gss_OID desired_mech,
 412     OM_uint32 overwrite_cred,
 413     OM_uint32 default_cred,
 414     gss_OID_set *elements_stored,
 415     gss_cred_usage_t *cred_usage_stored);
 416
 417 static OM_uint32 (*gssGetNameAttributeNext)(
 418     OM_uint32 *minor,
 419     gss_name_t name,
 420     gss_buffer_t attr,
 421     int *authenticated,
 422     int *complete,
 423     gss_buffer_t value,
 424     gss_buffer_t display_value,
 425     int *more);
 426
 427 #define NEXT_SYMBOL(local, global)  ((local) = dlsym(RTLD_NEXT, (global)))
 428
 429 OM_uint32
 430 gssEapReauthInitialize(OM_uint32 *minor)
 431 {
 432     NEXT_SYMBOL(gssInitSecContextNext,                    "gss_init_sec_context");
 433     NEXT_SYMBOL(gssAcceptSecContextNext,                  "gss_accept_sec_context");
 434     NEXT_SYMBOL(gssReleaseCredNext,                       "gss_release_cred");
 435     NEXT_SYMBOL(gssReleaseNameNext,                       "gss_release_name");
 436     NEXT_SYMBOL(gssInquireSecContextByOidNext,            "gss_inquire_sec_context_by_oid");
 437     NEXT_SYMBOL(gssDeleteSecContextNext,                  "gss_delete_sec_context");
 438     NEXT_SYMBOL(gssDisplayNameNext,                       "gss_display_name");
 439     NEXT_SYMBOL(gssImportNameNext,                        "gss_import_name");
 440     NEXT_SYMBOL(gssKrbExtractAuthzDataFromSecContextNext, "gsskrb5_extract_authz_data_from_sec_context");
 441     NEXT_SYMBOL(gssStoreCredNext,                         "gss_store_cred");
 442     NEXT_SYMBOL(gssGetNameAttributeNext,                  "gss_get_name_attribute");
 443
 444     return GSS_S_COMPLETE;
 445 }
 446
 447 OM_uint32
 448 gssInitSecContext(OM_uint32 *minor,
 449                   gss_cred_id_t cred,
 450                   gss_ctx_id_t *context_handle,
 451                   gss_name_t target_name,
 452                   gss_OID mech_type,
 453                   OM_uint32 req_flags,
 454                   OM_uint32 time_req,
 455                   gss_channel_bindings_t input_chan_bindings,
 456                   gss_buffer_t input_token,
 457                   gss_OID *actual_mech_type,
 458                   gss_buffer_t output_token,
 459                   OM_uint32 *ret_flags,
 460                   OM_uint32 *time_rec)
 461 {
 462     if (gssInitSecContextNext == NULL)
 463         return GSS_S_UNAVAILABLE;
 464
 465     return gssInitSecContextNext(minor, cred, context_handle,
 466                                  target_name, mech_type, req_flags,
 467                                  time_req, input_chan_bindings,
 468                                  input_token, actual_mech_type,
 469                                  output_token, ret_flags, time_rec);
 470 }
 471
 472 OM_uint32
 473 gssAcceptSecContext(OM_uint32 *minor,
 474                     gss_ctx_id_t *context_handle,
 475                     gss_cred_id_t cred,
 476                     gss_buffer_t input_token,
 477                     gss_channel_bindings_t input_chan_bindings,
 478                     gss_name_t *src_name,
 479                     gss_OID *mech_type,
 480                     gss_buffer_t output_token,
 481                     OM_uint32 *ret_flags,
 482                     OM_uint32 *time_rec,
 483                     gss_cred_id_t *delegated_cred_handle)
 484 {
 485     if (gssAcceptSecContextNext == NULL)
 486         return GSS_S_UNAVAILABLE;
 487
 488     return gssAcceptSecContextNext(minor, context_handle, cred,
 489                                    input_token, input_chan_bindings,
 490                                    src_name, mech_type, output_token,
 491                                    ret_flags, time_rec, delegated_cred_handle);
 492 }
 493
 494 OM_uint32
 495 gssReleaseCred(OM_uint32 *minor,
 496                gss_cred_id_t *cred_handle)
 497 {
 498     if (gssReleaseCredNext == NULL)
 499         return GSS_S_UNAVAILABLE;
 500
 501     return gssReleaseCredNext(minor, cred_handle);
 502 }
 503
 504 OM_uint32
 505 gssReleaseName(OM_uint32 *minor,
 506                gss_name_t *name)
 507 {
 508     if (gssReleaseName == NULL)
 509         return GSS_S_UNAVAILABLE;
 510
 511     return gssReleaseNameNext(minor, name);
 512 }
 513
 514 OM_uint32
 515 gssDeleteSecContext(OM_uint32 *minor,
 516                     gss_ctx_id_t *context_handle,
 517                     gss_buffer_t output_token)
 518 {
 519     if (gssDeleteSecContextNext == NULL)
 520         return GSS_S_UNAVAILABLE;
 521
 522     return gssDeleteSecContextNext(minor, context_handle, output_token);
 523 }
 524
 525 static OM_uint32
 526 gssDisplayName(OM_uint32 *minor,
 527                gss_name_t name,
 528                gss_buffer_t buffer,
 529                gss_OID *name_type)
 530 {
 531     if (gssDisplayNameNext == NULL)
 532         return GSS_S_UNAVAILABLE;
 533
 534     return gssDisplayNameNext(minor, name, buffer, name_type);
 535 }
 536
 537 static OM_uint32
 538 gssImportName(OM_uint32 *minor,
 539               gss_buffer_t buffer,
 540               gss_OID name_type,
 541               gss_name_t *name)
 542 {
 543     if (gssImportNameNext == NULL)
 544         return GSS_S_UNAVAILABLE;
 545
 546     return gssImportNameNext(minor, buffer, name_type, name);
 547 }
 548
 549 OM_uint32
 550 gssInquireSecContextByOid(OM_uint32 *minor,
 551                           const gss_ctx_id_t context_handle,
 552                           const gss_OID desired_object,
 553                           gss_buffer_set_t *data_set)
 554 {
 555     if (gssInquireSecContextByOidNext == NULL)
 556         return GSS_S_UNAVAILABLE;
 557
 558     return gssInquireSecContextByOidNext(minor, context_handle,
 559                                          desired_object, data_set);
 560 }
 561
 562 OM_uint32
 563 gssKrbExtractAuthzDataFromSecContext(OM_uint32 *minor,
 564                                      const gss_ctx_id_t ctx,
 565                                      int ad_type,
 566                                      gss_buffer_t ad_data)
 567 {
 568     if (gssKrbExtractAuthzDataFromSecContextNext == NULL)
 569         return GSS_S_UNAVAILABLE;
 570
 571     return gssKrbExtractAuthzDataFromSecContextNext(minor, ctx,
 572                                                     ad_type, ad_data);
 573 }
 574
 575 OM_uint32
 576 gssStoreCred(OM_uint32 *minor,
 577              const gss_cred_id_t input_cred_handle,
 578              gss_cred_usage_t input_usage,
 579              const gss_OID desired_mech,
 580              OM_uint32 overwrite_cred,
 581              OM_uint32 default_cred,
 582              gss_OID_set *elements_stored,
 583              gss_cred_usage_t *cred_usage_stored)
 584 {
 585     if (gssStoreCredNext == NULL)
 586         return GSS_S_UNAVAILABLE;
 587
 588     return gssStoreCredNext(minor, input_cred_handle, input_usage,
 589                             desired_mech, overwrite_cred, default_cred,
 590                             elements_stored, cred_usage_stored);
 591 }
 592
 593 OM_uint32
 594 gssGetNameAttribute(OM_uint32 *minor,
 595                     gss_name_t name,
 596                     gss_buffer_t attr,
 597                     int *authenticated,
 598                     int *complete,
 599                     gss_buffer_t value,
 600                     gss_buffer_t display_value,
 601                     int *more)
 602 {
 603     if (gssGetNameAttributeNext == NULL)
 604         return GSS_S_UNAVAILABLE;
 605
 606     return gssGetNameAttributeNext(minor, name, attr, authenticated, complete,
 607                                    value, display_value, more);
 608 }
 609
 610 static gss_buffer_desc radiusAvpKrbAttr = {
 611     sizeof("urn:authdata-radius-avp") - 1, "urn:authdata-radius-avp"
 612 };
 613
 614 /*
 615  * Unfortunately extracting an AD-KDCIssued authorization data element
 616  * is pretty implementation-dependent. It's not possible to verify the
 617  * signature ourselves because the ticket session key is not exposed
 618  * outside GSS. In an ideal world, all AD-KDCIssued elements would be
 619  * verified by the Kerberos library and authentication would fail if
 620  * verification failed. We're not quite there yet and as a result have
 621  * to go through some hoops to get this to work. The alternative would
 622  * be to sign the authorization data with our long-term key, but it
 623  * seems a pity to compromise the design because of current implementation
 624  * limitations.
 625  */
 626 OM_uint32
 627 defrostAttrContext(OM_uint32 *minor,
 628                    gss_name_t glueName,
 629                    gss_name_t mechName)
 630 {
 631     OM_uint32 major, tmpMinor;
 632     gss_buffer_desc authData = GSS_C_EMPTY_BUFFER;
 633     gss_buffer_desc authDataDisplay = GSS_C_EMPTY_BUFFER;
 634     int more = -1;
 635     int authenticated, complete;
 636
 637     major = gssGetNameAttribute(minor, glueName, &radiusAvpKrbAttr,
 638                                 &authenticated, &complete,
 639                                 &authData, &authDataDisplay, &more);
 640     if (major == GSS_S_COMPLETE) {
 641         if (authenticated == 0)
 642             major = GSS_S_BAD_NAME;
 643         else
 644             major = gssEapImportAttrContext(minor, &authData, mechName);
 645     } else if (major == GSS_S_UNAVAILABLE) {
 646         major = GSS_S_COMPLETE;
 647     }
 648
 649     gss_release_buffer(&tmpMinor, &authData);
 650     gss_release_buffer(&tmpMinor, &authDataDisplay);
 651
 652     return major;
 653 }
 654
 655 OM_uint32
 656 gssEapGlueToMechName(OM_uint32 *minor,
 657                      gss_name_t glueName,
 658                      gss_name_t *pMechName)
 659 {
 660     OM_uint32 major, tmpMinor;
 661     gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
 662
 663     *pMechName = GSS_C_NO_NAME;
 664
 665     major = gssDisplayName(minor, glueName, &nameBuf, NULL);
 666     if (GSS_ERROR(major))
 667         goto cleanup;
 668
 669     major = gssEapImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
 670                              pMechName);
 671     if (GSS_ERROR(major))
 672         goto cleanup;
 673
 674     major = defrostAttrContext(minor, glueName, *pMechName);
 675     if (GSS_ERROR(major))
 676         goto cleanup;
 677
 678 cleanup:
 679     if (GSS_ERROR(major)) {
 680         gssReleaseName(&tmpMinor, pMechName);
 681         *pMechName = GSS_C_NO_NAME;
 682     }
 683
 684     gss_release_buffer(&tmpMinor, &nameBuf);
 685
 686     return major;
 687 }
 688
 689 OM_uint32
 690 gssEapMechToGlueName(OM_uint32 *minor,
 691                      gss_name_t mechName,
 692                      gss_name_t *pGlueName)
 693 {
 694     OM_uint32 major, tmpMinor;
 695     gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
 696
 697     *pGlueName = GSS_C_NO_NAME;
 698
 699     major = gssEapDisplayName(minor, mechName, &nameBuf, NULL);
 700     if (GSS_ERROR(major))
 701         goto cleanup;
 702
 703     major = gssImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
 704                           pGlueName);
 705     if (GSS_ERROR(major))
 706         goto cleanup;
 707
 708 cleanup:
 709     gss_release_buffer(&tmpMinor, &nameBuf);
 710
 711     return major;
 712 }
 713
 714 OM_uint32
 715 gssEapReauthComplete(OM_uint32 *minor,
 716                     gss_ctx_id_t ctx,
 717                     gss_cred_id_t cred,
 718                     const gss_OID mech,
 719                     OM_uint32 timeRec)
 720 {
 721     OM_uint32 major, tmpMinor;
 722     gss_buffer_set_t keyData = GSS_C_NO_BUFFER_SET;
 723
 724     if (!oidEqual(mech, gss_mech_krb5)) {
 725         major = GSS_S_BAD_MECH;
 726         goto cleanup;
 727     }
 728
 729     major = gssInquireSecContextByOid(minor, ctx->kerberosCtx,
 730                                       GSS_C_INQ_SSPI_SESSION_KEY, &keyData);
 731     if (GSS_ERROR(major))
 732         goto cleanup;
 733
 734     {
 735         gss_OID_desc oid;
 736         int suffix;
 737
 738         oid.length = keyData->elements[1].length;
 739         oid.elements = keyData->elements[1].value;
 740
 741         /* GSS_KRB5_SESSION_KEY_ENCTYPE_OID */
 742         major = decomposeOid(minor,
 743                              "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02\x04",
 744                              10, &oid, &suffix);
 745         if (GSS_ERROR(major))
 746             goto cleanup;
 747
 748         ctx->encryptionType = suffix;
 749     }
 750
 751     {
 752         krb5_context krbContext = NULL;
 753         krb5_keyblock key;
 754
 755         GSSEAP_KRB_INIT(&krbContext);
 756
 757         KRB_KEY_LENGTH(&key) = keyData->elements[0].length;
 758         KRB_KEY_DATA(&key)   = keyData->elements[0].value;
 759         KRB_KEY_TYPE(&key)   = ctx->encryptionType;
 760
 761         *minor = krb5_copy_keyblock_contents(krbContext,
 762                                              &key, &ctx->rfc3961Key);
 763         if (*minor != 0) {
 764             major = GSS_S_FAILURE;
 765             goto cleanup;
 766         }
 767     }
 768
 769     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 770                                       &ctx->checksumType);
 771     if (GSS_ERROR(major))
 772         goto cleanup;
 773
 774     if (timeRec != GSS_C_INDEFINITE)
 775         ctx->expiryTime = time(NULL) + timeRec;
 776
 777     major = sequenceInit(minor,
 778                          &ctx->seqState, ctx->recvSeq,
 779                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 780                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 781                          TRUE);
 782     if (GSS_ERROR(major))
 783         goto cleanup;
 784
 785     major = GSS_S_COMPLETE;
 786
 787 cleanup:
 788     gss_release_buffer_set(&tmpMinor, &keyData);
 789
 790     return major;
 791 }
 792