source4/auth/gensec/gensec_krb5.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Kerberos backend for GENSEC
   5
   6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004
   7    Copyright (C) Andrew Tridgell 2001
   8    Copyright (C) Luke Howard 2002-2003
   9    Copyright (C) Stefan Metzmacher 2004-2005
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  24 */
  25
  26 #include "includes.h"
  27 #include <tevent.h>
  28 #include "lib/util/tevent_ntstatus.h"
  29 #include "system/kerberos.h"
  30 #include "auth/kerberos/kerberos.h"
  31 #include "auth/auth.h"
  32 #include "lib/tsocket/tsocket.h"
  33 #include "librpc/gen_ndr/dcerpc.h"
  34 #include "auth/credentials/credentials.h"
  35 #include "auth/credentials/credentials_krb5.h"
  36 #include "auth/kerberos/kerberos_credentials.h"
  37 #include "auth/gensec/gensec.h"
  38 #include "auth/gensec/gensec_internal.h"
  39 #include "auth/gensec/gensec_proto.h"
  40 #include "auth/gensec/gensec_toplevel_proto.h"
  41 #include "param/param.h"
  42 #include "auth/auth_sam_reply.h"
  43 #include "lib/util/util_net.h"
  44 #include "../lib/util/asn1.h"
  45 #include "auth/kerberos/pac_utils.h"
  46 #include "gensec_krb5.h"
  47
  48 _PUBLIC_ NTSTATUS gensec_krb5_init(TALLOC_CTX *);
  49
  50 enum GENSEC_KRB5_STATE {
  51         GENSEC_KRB5_SERVER_START,
  52         GENSEC_KRB5_CLIENT_START,
  53         GENSEC_KRB5_CLIENT_MUTUAL_AUTH,
  54         GENSEC_KRB5_DONE
  55 };
  56
  57 struct gensec_krb5_state {
  58         enum GENSEC_KRB5_STATE state_position;
  59         struct smb_krb5_context *smb_krb5_context;
  60         krb5_auth_context auth_context;
  61         krb5_data enc_ticket;
  62         krb5_keyblock *keyblock;
  63         krb5_ticket *ticket;
  64         bool gssapi;
  65         krb5_flags ap_req_options;
  66 };
  67
  68 static int gensec_krb5_destroy(struct gensec_krb5_state *gensec_krb5_state)
  69 {
  70         if (!gensec_krb5_state->smb_krb5_context) {
  71                 /* We can't clean anything else up unless we started up this far */
  72                 return 0;
  73         }
  74         if (gensec_krb5_state->enc_ticket.length) {
  75                 smb_krb5_free_data_contents(gensec_krb5_state->smb_krb5_context->krb5_context,
  76                                             &gensec_krb5_state->enc_ticket);
  77         }
  78
  79         if (gensec_krb5_state->ticket) {
  80                 krb5_free_ticket(gensec_krb5_state->smb_krb5_context->krb5_context,
  81                                  gensec_krb5_state->ticket);
  82         }
  83
  84         /* ccache freed in a child destructor */
  85
  86         krb5_free_keyblock(gensec_krb5_state->smb_krb5_context->krb5_context,
  87                            gensec_krb5_state->keyblock);
  88
  89         if (gensec_krb5_state->auth_context) {
  90                 krb5_auth_con_free(gensec_krb5_state->smb_krb5_context->krb5_context,
  91                                    gensec_krb5_state->auth_context);
  92         }
  93
  94         return 0;
  95 }
  96
  97 static NTSTATUS gensec_krb5_start(struct gensec_security *gensec_security, bool gssapi)
  98 {
  99         krb5_error_code ret;
 100         struct gensec_krb5_state *gensec_krb5_state;
 101         struct cli_credentials *creds;
 102         const struct tsocket_address *tlocal_addr, *tremote_addr;
 103         krb5_address my_krb5_addr, peer_krb5_addr;
 104
 105         creds = gensec_get_credentials(gensec_security);
 106         if (!creds) {
 107                 return NT_STATUS_INVALID_PARAMETER;
 108         }
 109
 110         gensec_krb5_state = talloc_zero(gensec_security, struct gensec_krb5_state);
 111         if (!gensec_krb5_state) {
 112                 return NT_STATUS_NO_MEMORY;
 113         }
 114
 115         gensec_security->private_data = gensec_krb5_state;
 116         gensec_krb5_state->gssapi = gssapi;
 117
 118         talloc_set_destructor(gensec_krb5_state, gensec_krb5_destroy);
 119
 120         if (cli_credentials_get_krb5_context(creds,
 121                                              gensec_security->settings->lp_ctx, &gensec_krb5_state->smb_krb5_context)) {
 122                 talloc_free(gensec_krb5_state);
 123                 return NT_STATUS_INTERNAL_ERROR;
 124         }
 125
 126         ret = krb5_auth_con_init(gensec_krb5_state->smb_krb5_context->krb5_context, &gensec_krb5_state->auth_context);
 127         if (ret) {
 128                 DEBUG(1,("gensec_krb5_start: krb5_auth_con_init failed (%s)\n",
 129                          smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 130                                                     ret, gensec_krb5_state)));
 131                 talloc_free(gensec_krb5_state);
 132                 return NT_STATUS_INTERNAL_ERROR;
 133         }
 134
 135         ret = krb5_auth_con_setflags(gensec_krb5_state->smb_krb5_context->krb5_context,
 136                                      gensec_krb5_state->auth_context,
 137                                      KRB5_AUTH_CONTEXT_DO_SEQUENCE);
 138         if (ret) {
 139                 DEBUG(1,("gensec_krb5_start: krb5_auth_con_setflags failed (%s)\n",
 140                          smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 141                                                     ret, gensec_krb5_state)));
 142                 talloc_free(gensec_krb5_state);
 143                 return NT_STATUS_INTERNAL_ERROR;
 144         }
 145
 146         tlocal_addr = gensec_get_local_address(gensec_security);
 147         if (tlocal_addr) {
 148                 ssize_t sockaddr_ret;
 149                 struct samba_sockaddr addr;
 150                 bool ok;
 151
 152                 sockaddr_ret = tsocket_address_bsd_sockaddr(
 153                         tlocal_addr, &addr.u.sa, sizeof(addr.u.sa));
 154                 if (sockaddr_ret < 0) {
 155                         talloc_free(gensec_krb5_state);
 156                         return NT_STATUS_INTERNAL_ERROR;
 157                 }
 158                 addr.sa_socklen = sockaddr_ret;
 159                 ok = smb_krb5_sockaddr_to_kaddr(&addr.u.ss, &my_krb5_addr);
 160                 if (!ok) {
 161                         DBG_WARNING("smb_krb5_sockaddr_to_kaddr (local) failed\n");
 162                         talloc_free(gensec_krb5_state);
 163                         return NT_STATUS_INTERNAL_ERROR;
 164                 }
 165         }
 166
 167         tremote_addr = gensec_get_remote_address(gensec_security);
 168         if (tremote_addr) {
 169                 ssize_t sockaddr_ret;
 170                 struct samba_sockaddr addr;
 171                 bool ok;
 172
 173                 sockaddr_ret = tsocket_address_bsd_sockaddr(
 174                         tremote_addr, &addr.u.sa, sizeof(addr.u.sa));
 175                 if (sockaddr_ret < 0) {
 176                         talloc_free(gensec_krb5_state);
 177                         return NT_STATUS_INTERNAL_ERROR;
 178                 }
 179                 addr.sa_socklen = sockaddr_ret;
 180                 ok = smb_krb5_sockaddr_to_kaddr(&addr.u.ss, &peer_krb5_addr);
 181                 if (!ok) {
 182                         DBG_WARNING("smb_krb5_sockaddr_to_kaddr (remote) failed\n");
 183                         talloc_free(gensec_krb5_state);
 184                         return NT_STATUS_INTERNAL_ERROR;
 185                 }
 186         }
 187
 188         ret = krb5_auth_con_setaddrs(gensec_krb5_state->smb_krb5_context->krb5_context,
 189                                      gensec_krb5_state->auth_context,
 190                                      tlocal_addr ? &my_krb5_addr : NULL,
 191                                      tremote_addr ? &peer_krb5_addr : NULL);
 192         if (ret) {
 193                 DEBUG(1,("gensec_krb5_start: krb5_auth_con_setaddrs failed (%s)\n",
 194                          smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 195                                                     ret, gensec_krb5_state)));
 196                 talloc_free(gensec_krb5_state);
 197                 return NT_STATUS_INTERNAL_ERROR;
 198         }
 199
 200         return NT_STATUS_OK;
 201 }
 202
 203 static NTSTATUS gensec_krb5_common_server_start(struct gensec_security *gensec_security, bool gssapi)
 204 {
 205         NTSTATUS nt_status;
 206         struct gensec_krb5_state *gensec_krb5_state;
 207
 208         nt_status = gensec_krb5_start(gensec_security, gssapi);
 209         if (!NT_STATUS_IS_OK(nt_status)) {
 210                 return nt_status;
 211         }
 212
 213         gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
 214         gensec_krb5_state->state_position = GENSEC_KRB5_SERVER_START;
 215
 216         return NT_STATUS_OK;
 217 }
 218
 219 static NTSTATUS gensec_krb5_server_start(struct gensec_security *gensec_security)
 220 {
 221         return gensec_krb5_common_server_start(gensec_security, false);
 222 }
 223
 224 static NTSTATUS gensec_fake_gssapi_krb5_server_start(struct gensec_security *gensec_security)
 225 {
 226         return gensec_krb5_common_server_start(gensec_security, true);
 227 }
 228
 229 static NTSTATUS gensec_krb5_common_client_start(struct gensec_security *gensec_security, bool gssapi)
 230 {
 231         const char *hostname;
 232         struct gensec_krb5_state *gensec_krb5_state;
 233         NTSTATUS nt_status;
 234         hostname = gensec_get_target_hostname(gensec_security);
 235         if (!hostname) {
 236                 DEBUG(3, ("No hostname for target computer passed in, cannot use kerberos for this connection\n"));
 237                 return NT_STATUS_INVALID_PARAMETER;
 238         }
 239         if (is_ipaddress(hostname)) {
 240                 DEBUG(2, ("Cannot do krb5 to an IP address"));
 241                 return NT_STATUS_INVALID_PARAMETER;
 242         }
 243         if (strcmp(hostname, "localhost") == 0) {
 244                 DEBUG(2, ("krb5 to 'localhost' does not make sense"));
 245                 return NT_STATUS_INVALID_PARAMETER;
 246         }
 247
 248         nt_status = gensec_krb5_start(gensec_security, gssapi);
 249         if (!NT_STATUS_IS_OK(nt_status)) {
 250                 return nt_status;
 251         }
 252
 253         gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
 254         gensec_krb5_state->state_position = GENSEC_KRB5_CLIENT_START;
 255         gensec_krb5_state->ap_req_options = AP_OPTS_USE_SUBKEY;
 256
 257         if (gensec_krb5_state->gssapi) {
 258                 /* The Fake GSSAPI model emulates Samba3, which does not do mutual authentication */
 259                 if (gensec_setting_bool(gensec_security->settings, "gensec_fake_gssapi_krb5", "mutual", false)) {
 260                         gensec_krb5_state->ap_req_options |= AP_OPTS_MUTUAL_REQUIRED;
 261                 }
 262         } else {
 263                 /* The wrapping for KPASSWD (a user of the raw KRB5 API) should be mutually authenticated */
 264                 if (gensec_setting_bool(gensec_security->settings, "gensec_krb5", "mutual", true)) {
 265                         gensec_krb5_state->ap_req_options |= AP_OPTS_MUTUAL_REQUIRED;
 266                 }
 267         }
 268         return NT_STATUS_OK;
 269 }
 270
 271 static NTSTATUS gensec_krb5_common_client_creds(struct gensec_security *gensec_security,
 272                                                 struct tevent_context *ev)
 273 {
 274         struct gensec_krb5_state *gensec_krb5_state;
 275         krb5_error_code ret;
 276         struct ccache_container *ccache_container;
 277         const char *error_string;
 278         const char *principal;
 279         const char *hostname;
 280         krb5_data in_data = { .length = 0 };
 281         krb5_data *in_data_p = NULL;
 282 #ifdef SAMBA4_USES_HEIMDAL
 283         struct tevent_context *previous_ev;
 284 #endif
 285
 286         if (lpcfg_parm_bool(gensec_security->settings->lp_ctx,
 287                             NULL, "gensec_krb5", "send_authenticator_checksum", true)) {
 288                 in_data_p = &in_data;
 289         }
 290
 291         gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
 292
 293         principal = gensec_get_target_principal(gensec_security);
 294         hostname = gensec_get_target_hostname(gensec_security);
 295
 296         ret = cli_credentials_get_ccache(gensec_get_credentials(gensec_security),
 297                                          ev,
 298                                          gensec_security->settings->lp_ctx, &ccache_container, &error_string);
 299         switch (ret) {
 300         case 0:
 301                 break;
 302         case KRB5KDC_ERR_PREAUTH_FAILED:
 303         case KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN:
 304                 return NT_STATUS_LOGON_FAILURE;
 305         case KRB5_KDC_UNREACH:
 306                 DEBUG(3, ("Cannot reach a KDC we require to contact %s: %s\n", principal, error_string));
 307                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 308         case KRB5_CC_NOTFOUND:
 309         case KRB5_CC_END:
 310                 DEBUG(3, ("Error preparing credentials we require to contact %s : %s\n", principal, error_string));
 311                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 312         default:
 313                 DEBUG(1, ("gensec_krb5_start: Aquiring initiator credentials failed: %s\n", error_string));
 314                 return NT_STATUS_UNSUCCESSFUL;
 315         }
 316
 317 #ifdef SAMBA4_USES_HEIMDAL
 318         /* Do this every time, in case we have weird recursive issues here */
 319         ret = smb_krb5_context_set_event_ctx(gensec_krb5_state->smb_krb5_context, ev, &previous_ev);
 320         if (ret != 0) {
 321                 DEBUG(1, ("gensec_krb5_start: Setting event context failed\n"));
 322                 return NT_STATUS_NO_MEMORY;
 323         }
 324 #endif
 325         if (principal) {
 326                 krb5_principal target_principal;
 327                 ret = krb5_parse_name(gensec_krb5_state->smb_krb5_context->krb5_context, principal,
 328                                       &target_principal);
 329                 if (ret == 0) {
 330                         krb5_creds this_cred;
 331                         krb5_creds *cred;
 332
 333                         ZERO_STRUCT(this_cred);
 334                         ret = krb5_cc_get_principal(gensec_krb5_state->smb_krb5_context->krb5_context,
 335                                                     ccache_container->ccache,
 336                                                     &this_cred.client);
 337                         if (ret != 0) {
 338                                 krb5_free_principal(gensec_krb5_state->smb_krb5_context->krb5_context,
 339                                                     target_principal);
 340                                 return NT_STATUS_UNSUCCESSFUL;
 341                         }
 342
 343                         ret = krb5_copy_principal(gensec_krb5_state->smb_krb5_context->krb5_context,
 344                                                   target_principal,
 345                                                   &this_cred.server);
 346                         krb5_free_principal(gensec_krb5_state->smb_krb5_context->krb5_context,
 347                                             target_principal);
 348                         if (ret != 0) {
 349                                 krb5_free_cred_contents(gensec_krb5_state->smb_krb5_context->krb5_context,
 350                                                         &this_cred);
 351                                 return NT_STATUS_UNSUCCESSFUL;
 352                         }
 353                         this_cred.times.endtime = 0;
 354
 355                         ret = krb5_get_credentials(gensec_krb5_state->smb_krb5_context->krb5_context,
 356                                                    0,
 357                                                    ccache_container->ccache,
 358                                                    &this_cred,
 359                                                    &cred);
 360                         krb5_free_cred_contents(gensec_krb5_state->smb_krb5_context->krb5_context,
 361                                                 &this_cred);
 362                         if (ret != 0) {
 363                                 return NT_STATUS_UNSUCCESSFUL;
 364                         }
 365
 366                         ret = krb5_mk_req_extended(gensec_krb5_state->smb_krb5_context->krb5_context,
 367                                                    &gensec_krb5_state->auth_context,
 368                                                    gensec_krb5_state->ap_req_options,
 369                                                    in_data_p,
 370                                                    cred,
 371                                                    &gensec_krb5_state->enc_ticket);
 372                 }
 373         } else {
 374                 ret = krb5_mk_req(gensec_krb5_state->smb_krb5_context->krb5_context,
 375                                   &gensec_krb5_state->auth_context,
 376                                   gensec_krb5_state->ap_req_options,
 377                                   discard_const_p(char, gensec_get_target_service(gensec_security)),
 378                                   discard_const_p(char, hostname),
 379                                   in_data_p, ccache_container->ccache,
 380                                   &gensec_krb5_state->enc_ticket);
 381         }
 382
 383 #ifdef SAMBA4_USES_HEIMDAL
 384         smb_krb5_context_remove_event_ctx(gensec_krb5_state->smb_krb5_context, previous_ev, ev);
 385 #endif
 386
 387         switch (ret) {
 388         case 0:
 389                 return NT_STATUS_OK;
 390         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 391                 DEBUG(3, ("Server [%s] is not registered with our KDC: %s\n",
 392                           hostname, smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 393                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 394         case KRB5_KDC_UNREACH:
 395                 DEBUG(3, ("Cannot reach a KDC we require to contact host [%s]: %s\n",
 396                           hostname, smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 397                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 398         case KRB5KDC_ERR_PREAUTH_FAILED:
 399         case KRB5KRB_AP_ERR_TKT_EXPIRED:
 400         case KRB5_CC_END:
 401                 /* Too much clock skew - we will need to kinit to re-skew the clock */
 402         case KRB5KRB_AP_ERR_SKEW:
 403         case KRB5_KDCREP_SKEW:
 404                 DEBUG(3, ("kerberos (mk_req) failed: %s\n",
 405                           smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 406                 FALL_THROUGH;
 407         /* just don't print a message for these really ordinary messages */
 408         case KRB5_FCC_NOFILE:
 409         case KRB5_CC_NOTFOUND:
 410         case ENOENT:
 411
 412                 return NT_STATUS_UNSUCCESSFUL;
 413                 break;
 414
 415         default:
 416                 DEBUG(0, ("kerberos: %s\n",
 417                           smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 418                 return NT_STATUS_UNSUCCESSFUL;
 419         }
 420 }
 421
 422 static NTSTATUS gensec_krb5_client_start(struct gensec_security *gensec_security)
 423 {
 424         return gensec_krb5_common_client_start(gensec_security, false);
 425 }
 426
 427 static NTSTATUS gensec_fake_gssapi_krb5_client_start(struct gensec_security *gensec_security)
 428 {
 429         return gensec_krb5_common_client_start(gensec_security, true);
 430 }
 431
 432
 433 /*
 434   generate a krb5 GSS-API wrapper packet given a ticket
 435 */
 436 static DATA_BLOB gensec_gssapi_gen_krb5_wrap(TALLOC_CTX *mem_ctx, const DATA_BLOB *ticket, const uint8_t tok_id[2])
 437 {
 438         struct asn1_data *data;
 439         DATA_BLOB ret = data_blob_null;
 440
 441         data = asn1_init(mem_ctx);
 442         if (!data || !ticket->data) {
 443                 return ret;
 444         }
 445
 446         if (!asn1_push_tag(data, ASN1_APPLICATION(0))) goto err;
 447         if (!asn1_write_OID(data, GENSEC_OID_KERBEROS5)) goto err;
 448
 449         if (!asn1_write(data, tok_id, 2)) goto err;
 450         if (!asn1_write(data, ticket->data, ticket->length)) goto err;
 451         if (!asn1_pop_tag(data)) goto err;
 452
 453
 454         if (!asn1_extract_blob(data, mem_ctx, &ret)) {
 455                 goto err;
 456         }
 457         asn1_free(data);
 458
 459         return ret;
 460
 461   err:
 462
 463         DEBUG(1, ("Failed to build krb5 wrapper at offset %d\n",
 464                   (int)asn1_current_ofs(data)));
 465         asn1_free(data);
 466         return ret;
 467 }
 468
 469 /*
 470   parse a krb5 GSS-API wrapper packet giving a ticket
 471 */
 472 static bool gensec_gssapi_parse_krb5_wrap(TALLOC_CTX *mem_ctx, const DATA_BLOB *blob, DATA_BLOB *ticket, uint8_t tok_id[2])
 473 {
 474         bool ret = false;
 475         struct asn1_data *data = asn1_init(mem_ctx);
 476         int data_remaining;
 477
 478         if (!data) {
 479                 return false;
 480         }
 481
 482         if (!asn1_load(data, *blob)) goto err;
 483         if (!asn1_start_tag(data, ASN1_APPLICATION(0))) goto err;
 484         if (!asn1_check_OID(data, GENSEC_OID_KERBEROS5)) goto err;
 485
 486         data_remaining = asn1_tag_remaining(data);
 487
 488         if (data_remaining < 3) {
 489                 asn1_set_error(data);
 490         } else {
 491                 if (!asn1_read(data, tok_id, 2)) goto err;
 492                 data_remaining -= 2;
 493                 *ticket = data_blob_talloc(mem_ctx, NULL, data_remaining);
 494                 if (!asn1_read(data, ticket->data, ticket->length)) goto err;
 495         }
 496
 497         if (!asn1_end_tag(data)) goto err;
 498
 499         ret = !asn1_has_error(data);
 500
 501   err:
 502
 503         asn1_free(data);
 504
 505         return ret;
 506 }
 507
 508 static NTSTATUS gensec_krb5_update_internal(struct gensec_security *gensec_security,
 509                                             TALLOC_CTX *out_mem_ctx,
 510                                             struct tevent_context *ev,
 511                                             const DATA_BLOB in, DATA_BLOB *out)
 512 {
 513         struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
 514         krb5_error_code ret = 0;
 515         NTSTATUS nt_status;
 516
 517         switch (gensec_krb5_state->state_position) {
 518         case GENSEC_KRB5_CLIENT_START:
 519         {
 520                 DATA_BLOB unwrapped_out;
 521
 522                 nt_status = gensec_krb5_common_client_creds(gensec_security, ev);
 523                 if (!NT_STATUS_IS_OK(nt_status)) {
 524                         return nt_status;
 525                 }
 526
 527                 if (gensec_krb5_state->gssapi) {
 528                         unwrapped_out = data_blob_talloc(out_mem_ctx, gensec_krb5_state->enc_ticket.data, gensec_krb5_state->enc_ticket.length);
 529
 530                         /* wrap that up in a nice GSS-API wrapping */
 531                         *out = gensec_gssapi_gen_krb5_wrap(out_mem_ctx, &unwrapped_out, TOK_ID_KRB_AP_REQ);
 532                 } else {
 533                         *out = data_blob_talloc(out_mem_ctx, gensec_krb5_state->enc_ticket.data, gensec_krb5_state->enc_ticket.length);
 534                 }
 535                 if (gensec_krb5_state->ap_req_options & AP_OPTS_MUTUAL_REQUIRED) {
 536                         gensec_krb5_state->state_position = GENSEC_KRB5_CLIENT_MUTUAL_AUTH;
 537                         nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 538                 } else {
 539                         gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
 540                         nt_status = NT_STATUS_OK;
 541                 }
 542                 return nt_status;
 543         }
 544
 545         case GENSEC_KRB5_CLIENT_MUTUAL_AUTH:
 546         {
 547                 DATA_BLOB unwrapped_in;
 548                 krb5_data inbuf;
 549                 krb5_ap_rep_enc_part *repl = NULL;
 550                 uint8_t tok_id[2];
 551
 552                 if (gensec_krb5_state->gssapi) {
 553                         if (!gensec_gssapi_parse_krb5_wrap(out_mem_ctx, &in, &unwrapped_in, tok_id)) {
 554                                 DEBUG(1,("gensec_gssapi_parse_krb5_wrap(mutual authentication) failed to parse\n"));
 555                                 dump_data_pw("Mutual authentication message:\n", in.data, in.length);
 556                                 return NT_STATUS_INVALID_PARAMETER;
 557                         }
 558                 } else {
 559                         unwrapped_in = in;
 560                 }
 561                 /* TODO: check the tok_id */
 562
 563                 inbuf.data = (char *)unwrapped_in.data;
 564                 inbuf.length = unwrapped_in.length;
 565                 ret = krb5_rd_rep(gensec_krb5_state->smb_krb5_context->krb5_context,
 566                                   gensec_krb5_state->auth_context,
 567                                   &inbuf, &repl);
 568                 if (ret) {
 569                         DEBUG(1,("krb5_rd_rep (mutual authentication) failed (%s)\n",
 570                                  smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, out_mem_ctx)));
 571                         dump_data_pw("Mutual authentication message:\n", (uint8_t *)inbuf.data, inbuf.length);
 572                         nt_status = NT_STATUS_ACCESS_DENIED;
 573                 } else {
 574                         *out = data_blob(NULL, 0);
 575                         nt_status = NT_STATUS_OK;
 576                         gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
 577                 }
 578                 if (repl) {
 579                         krb5_free_ap_rep_enc_part(gensec_krb5_state->smb_krb5_context->krb5_context, repl);
 580                 }
 581                 return nt_status;
 582         }
 583
 584         case GENSEC_KRB5_SERVER_START:
 585         {
 586                 DATA_BLOB unwrapped_in;
 587                 DATA_BLOB unwrapped_out = data_blob(NULL, 0);
 588                 krb5_data inbuf, outbuf;
 589                 uint8_t tok_id[2];
 590                 struct keytab_container *keytab;
 591                 krb5_principal server_in_keytab;
 592                 const char *error_string;
 593                 enum credentials_obtained obtained;
 594
 595                 if (!in.data) {
 596                         return NT_STATUS_INVALID_PARAMETER;
 597                 }
 598
 599                 /* Grab the keytab, however generated */
 600                 ret = cli_credentials_get_keytab(gensec_get_credentials(gensec_security),
 601                                                  gensec_security->settings->lp_ctx, &keytab);
 602                 if (ret) {
 603                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 604                 }
 605
 606                 /* This ensures we lookup the correct entry in that
 607                  * keytab.  A NULL principal is acceptable, and means
 608                  * that the krb5 libs should search the keytab at
 609                  * accept time for any matching key */
 610                 ret = principal_from_credentials(out_mem_ctx, gensec_get_credentials(gensec_security),
 611                                                  gensec_krb5_state->smb_krb5_context,
 612                                                  &server_in_keytab, &obtained, &error_string);
 613
 614                 if (ret) {
 615                         DEBUG(2,("Failed to make credentials from principal: %s\n", error_string));
 616                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 617                 }
 618
 619                 if (keytab->password_based || obtained < CRED_SPECIFIED) {
 620                         /*
 621                          * Use match-by-key in this case (matches
 622                          * cli_credentials_get_server_gss_creds()
 623                          * behaviour).  No need to free the memory,
 624                          * this is handled with a talloc destructor.
 625                          */
 626                         server_in_keytab = NULL;
 627                 }
 628
 629                 /* Parse the GSSAPI wrapping, if it's there... (win2k3 allows it to be omited) */
 630                 if (gensec_krb5_state->gssapi
 631                     && gensec_gssapi_parse_krb5_wrap(out_mem_ctx, &in, &unwrapped_in, tok_id)) {
 632                         inbuf.data = (char *)unwrapped_in.data;
 633                         inbuf.length = unwrapped_in.length;
 634                 } else {
 635                         inbuf.data = (char *)in.data;
 636                         inbuf.length = in.length;
 637                 }
 638
 639                 ret = smb_krb5_rd_req_decoded(gensec_krb5_state->smb_krb5_context->krb5_context,
 640                                               &gensec_krb5_state->auth_context,
 641                                               &inbuf,
 642                                               keytab->keytab,
 643                                               server_in_keytab,
 644                                               &outbuf,
 645                                               &gensec_krb5_state->ticket,
 646                                               &gensec_krb5_state->keyblock);
 647
 648                 if (ret) {
 649                         DBG_WARNING("smb_krb5_rd_req_decoded failed\n");
 650                         return NT_STATUS_LOGON_FAILURE;
 651                 }
 652                 unwrapped_out.data = (uint8_t *)outbuf.data;
 653                 unwrapped_out.length = outbuf.length;
 654                 gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
 655                 /* wrap that up in a nice GSS-API wrapping */
 656                 if (gensec_krb5_state->gssapi) {
 657                         *out = gensec_gssapi_gen_krb5_wrap(out_mem_ctx, &unwrapped_out, TOK_ID_KRB_AP_REP);
 658                 } else {
 659                         *out = data_blob_talloc(out_mem_ctx, outbuf.data, outbuf.length);
 660                 }
 661                 smb_krb5_free_data_contents(gensec_krb5_state->smb_krb5_context->krb5_context,
 662                                             &outbuf);
 663                 return NT_STATUS_OK;
 664         }
 665
 666         case GENSEC_KRB5_DONE:
 667         default:
 668                 /* Asking too many times... */
 669                 return NT_STATUS_INVALID_PARAMETER;
 670         }
 671 }
 672
 673 struct gensec_krb5_update_state {
 674         NTSTATUS status;
 675         DATA_BLOB out;
 676 };
 677
 678 static struct tevent_req *gensec_krb5_update_send(TALLOC_CTX *mem_ctx,
 679                                                   struct tevent_context *ev,
 680                                                   struct gensec_security *gensec_security,
 681                                                   const DATA_BLOB in)
 682 {
 683         struct tevent_req *req = NULL;
 684         struct gensec_krb5_update_state *state = NULL;
 685         NTSTATUS status;
 686
 687         req = tevent_req_create(mem_ctx, &state,
 688                                 struct gensec_krb5_update_state);
 689         if (req == NULL) {
 690                 return NULL;
 691         }
 692
 693         status = gensec_krb5_update_internal(gensec_security,
 694                                              state, ev, in,
 695                                              &state->out);
 696         state->status = status;
 697         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 698                 tevent_req_done(req);
 699                 return tevent_req_post(req, ev);
 700         }
 701         if (tevent_req_nterror(req, status)) {
 702                 return tevent_req_post(req, ev);
 703         }
 704
 705         tevent_req_done(req);
 706         return tevent_req_post(req, ev);
 707 }
 708
 709 static NTSTATUS gensec_krb5_update_recv(struct tevent_req *req,
 710                                         TALLOC_CTX *out_mem_ctx,
 711                                         DATA_BLOB *out)
 712 {
 713         struct gensec_krb5_update_state *state =
 714                 tevent_req_data(req,
 715                 struct gensec_krb5_update_state);
 716         NTSTATUS status;
 717
 718         *out = data_blob_null;
 719
 720         if (tevent_req_is_nterror(req, &status)) {
 721                 tevent_req_received(req);
 722                 return status;
 723         }
 724
 725         *out = state->out;
 726         talloc_steal(out_mem_ctx, state->out.data);
 727         status = state->status;
 728         tevent_req_received(req);
 729         return status;
 730 }
 731
 732 static NTSTATUS gensec_krb5_session_key(struct gensec_security *gensec_security,
 733                                         TALLOC_CTX *mem_ctx,
 734                                         DATA_BLOB *session_key)
 735 {
 736         struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
 737         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
 738         krb5_auth_context auth_context = gensec_krb5_state->auth_context;
 739         krb5_error_code err = -1;
 740         bool remote = false;
 741         bool ok;
 742
 743         if (gensec_krb5_state->state_position != GENSEC_KRB5_DONE) {
 744                 return NT_STATUS_NO_USER_SESSION_KEY;
 745         }
 746
 747         switch (gensec_security->gensec_role) {
 748         case GENSEC_CLIENT:
 749                 remote = false;
 750                 break;
 751         case GENSEC_SERVER:
 752                 remote = true;
 753                 break;
 754         }
 755
 756         ok = smb_krb5_get_smb_session_key(mem_ctx,
 757                                           context,
 758                                           auth_context,
 759                                           session_key,
 760                                           remote);
 761         if (!ok) {
 762                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 763                 return NT_STATUS_NO_USER_SESSION_KEY;
 764         }
 765
 766         return NT_STATUS_OK;
 767 }
 768
 769 #ifdef SAMBA4_USES_HEIMDAL
 770 static NTSTATUS gensec_krb5_session_info(struct gensec_security *gensec_security,
 771                                          TALLOC_CTX *mem_ctx,
 772                                          struct auth_session_info **_session_info)
 773 {
 774         NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
 775         struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
 776         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
 777         struct auth_session_info *session_info = NULL;
 778
 779         krb5_principal client_principal;
 780         char *principal_string = NULL;
 781
 782         DATA_BLOB pac_blob, *pac_blob_ptr = NULL;
 783         krb5_data pac_data;
 784
 785         krb5_error_code ret;
 786
 787         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 788         if (!tmp_ctx) {
 789                 return NT_STATUS_NO_MEMORY;
 790         }
 791
 792         ret = krb5_ticket_get_client(context, gensec_krb5_state->ticket, &client_principal);
 793         if (ret) {
 794                 DEBUG(5, ("krb5_ticket_get_client failed to get client principal: %s\n",
 795                           smb_get_krb5_error_message(context,
 796                                                      ret, tmp_ctx)));
 797                 talloc_free(tmp_ctx);
 798                 return NT_STATUS_NO_MEMORY;
 799         }
 800
 801         ret = krb5_unparse_name(gensec_krb5_state->smb_krb5_context->krb5_context,
 802                                 client_principal, &principal_string);
 803         if (ret) {
 804                 DEBUG(1, ("Unable to parse client principal: %s\n",
 805                           smb_get_krb5_error_message(context,
 806                                                      ret, tmp_ctx)));
 807                 krb5_free_principal(context, client_principal);
 808                 talloc_free(tmp_ctx);
 809                 return NT_STATUS_NO_MEMORY;
 810         }
 811
 812         ret = krb5_ticket_get_authorization_data_type(context, gensec_krb5_state->ticket,
 813                                                       KRB5_AUTHDATA_WIN2K_PAC,
 814                                                       &pac_data);
 815
 816         if (ret) {
 817                 /* NO pac */
 818                 DEBUG(5, ("krb5_ticket_get_authorization_data_type failed to find PAC: %s\n",
 819                           smb_get_krb5_error_message(context,
 820                                                      ret, tmp_ctx)));
 821         } else {
 822                 /* Found pac */
 823                 pac_blob = data_blob_talloc(tmp_ctx, pac_data.data, pac_data.length);
 824                 smb_krb5_free_data_contents(context, &pac_data);
 825                 if (!pac_blob.data) {
 826                         free(principal_string);
 827                         krb5_free_principal(context, client_principal);
 828                         talloc_free(tmp_ctx);
 829                         return NT_STATUS_NO_MEMORY;
 830                 }
 831
 832                 /* decode and verify the pac */
 833                 nt_status = kerberos_decode_pac(gensec_krb5_state,
 834                                                 pac_blob,
 835                                                 gensec_krb5_state->smb_krb5_context->krb5_context,
 836                                                 NULL, gensec_krb5_state->keyblock,
 837                                                 client_principal,
 838                                                 gensec_krb5_state->ticket->ticket.authtime, NULL);
 839
 840                 if (!NT_STATUS_IS_OK(nt_status)) {
 841                         free(principal_string);
 842                         krb5_free_principal(context, client_principal);
 843                         talloc_free(tmp_ctx);
 844                         return nt_status;
 845                 }
 846
 847                 pac_blob_ptr = &pac_blob;
 848         }
 849
 850         nt_status = gensec_generate_session_info_pac(tmp_ctx,
 851                                                      gensec_security,
 852                                                      gensec_krb5_state->smb_krb5_context,
 853                                                      pac_blob_ptr, principal_string,
 854                                                      gensec_get_remote_address(gensec_security),
 855                                                      &session_info);
 856
 857         free(principal_string);
 858         krb5_free_principal(context, client_principal);
 859
 860         if (!NT_STATUS_IS_OK(nt_status)) {
 861                 talloc_free(tmp_ctx);
 862                 return nt_status;
 863         }
 864
 865         nt_status = gensec_krb5_session_key(gensec_security, session_info, &session_info->session_key);
 866
 867         if (!NT_STATUS_IS_OK(nt_status)) {
 868                 talloc_free(tmp_ctx);
 869                 return nt_status;
 870         }
 871
 872         *_session_info = talloc_steal(mem_ctx, session_info);
 873
 874         talloc_free(tmp_ctx);
 875         return NT_STATUS_OK;
 876 }
 877 #else /* MIT KERBEROS */
 878 static NTSTATUS gensec_krb5_session_info(struct gensec_security *gensec_security,
 879                                          TALLOC_CTX *mem_ctx,
 880                                          struct auth_session_info **psession_info)
 881 {
 882         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
 883         struct gensec_krb5_state *gensec_krb5_state =
 884                 (struct gensec_krb5_state *)gensec_security->private_data;
 885         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
 886         struct auth_session_info *session_info = NULL;
 887
 888         krb5_principal client_principal;
 889         char *principal_string = NULL;
 890
 891         krb5_authdata **auth_pac_data = NULL;
 892         DATA_BLOB pac_blob, *pac_blob_ptr = NULL;
 893
 894         krb5_error_code code;
 895
 896         TALLOC_CTX *tmp_ctx;
 897
 898         tmp_ctx = talloc_new(mem_ctx);
 899         if (tmp_ctx == NULL) {
 900                 return NT_STATUS_NO_MEMORY;
 901         }
 902
 903         code = krb5_copy_principal(context,
 904                                    gensec_krb5_state->ticket->enc_part2->client,
 905                                    &client_principal);
 906         if (code != 0) {
 907                 DBG_INFO("krb5_copy_principal failed to copy client "
 908                          "principal: %s\n",
 909                          smb_get_krb5_error_message(context, code, tmp_ctx));
 910                 talloc_free(tmp_ctx);
 911                 return NT_STATUS_NO_MEMORY;
 912         }
 913
 914         code = krb5_unparse_name(context, client_principal, &principal_string);
 915         if (code != 0) {
 916                 DBG_WARNING("Unable to parse client principal: %s\n",
 917                             smb_get_krb5_error_message(context, code, tmp_ctx));
 918                 krb5_free_principal(context, client_principal);
 919                 talloc_free(tmp_ctx);
 920                 return NT_STATUS_NO_MEMORY;
 921         }
 922
 923         code = krb5_find_authdata(context,
 924                                   gensec_krb5_state->ticket->enc_part2->authorization_data,
 925                                   NULL,
 926                                   KRB5_AUTHDATA_WIN2K_PAC,
 927                                   &auth_pac_data);
 928         if (code != 0) {
 929                 /* NO pac */
 930                 DBG_INFO("krb5_find_authdata failed to find PAC: %s\n",
 931                          smb_get_krb5_error_message(context, code, tmp_ctx));
 932         } else {
 933                 krb5_timestamp ticket_authtime =
 934                         gensec_krb5_state->ticket->enc_part2->times.authtime;
 935
 936                 /* Found pac */
 937                 pac_blob = data_blob_talloc(tmp_ctx,
 938                                             auth_pac_data[0]->contents,
 939                                             auth_pac_data[0]->length);
 940                 krb5_free_authdata(context, auth_pac_data);
 941                 if (pac_blob.data == NULL) {
 942                         free(principal_string);
 943                         krb5_free_principal(context, client_principal);
 944                         talloc_free(tmp_ctx);
 945                         return NT_STATUS_NO_MEMORY;
 946                 }
 947
 948                 /* decode and verify the pac */
 949                 status = kerberos_decode_pac(gensec_krb5_state,
 950                                              pac_blob,
 951                                              context,
 952                                              NULL,
 953                                              gensec_krb5_state->keyblock,
 954                                              client_principal,
 955                                              ticket_authtime,
 956                                              NULL);
 957
 958                 if (!NT_STATUS_IS_OK(status)) {
 959                         free(principal_string);
 960                         krb5_free_principal(context, client_principal);
 961                         talloc_free(tmp_ctx);
 962                         return status;
 963                 }
 964
 965                 pac_blob_ptr = &pac_blob;
 966         }
 967         krb5_free_principal(context, client_principal);
 968
 969         status = gensec_generate_session_info_pac(tmp_ctx,
 970                                                   gensec_security,
 971                                                   gensec_krb5_state->smb_krb5_context,
 972                                                   pac_blob_ptr,
 973                                                   principal_string,
 974                                                   gensec_get_remote_address(gensec_security),
 975                                                   &session_info);
 976         SAFE_FREE(principal_string);
 977         if (!NT_STATUS_IS_OK(status)) {
 978                 talloc_free(tmp_ctx);
 979                 return status;
 980         }
 981
 982         status = gensec_krb5_session_key(gensec_security,
 983                                          session_info,
 984                                          &session_info->session_key);
 985         if (!NT_STATUS_IS_OK(status)) {
 986                 talloc_free(tmp_ctx);
 987                 return status;
 988         }
 989
 990         *psession_info = talloc_steal(mem_ctx, session_info);
 991         talloc_free(tmp_ctx);
 992
 993         return NT_STATUS_OK;
 994 }
 995 #endif /* SAMBA4_USES_HEIMDAL */
 996
 997 static NTSTATUS gensec_krb5_wrap(struct gensec_security *gensec_security,
 998                                    TALLOC_CTX *mem_ctx,
 999                                    const DATA_BLOB *in,
1000                                    DATA_BLOB *out)
1001 {
1002         struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
1003         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
1004         krb5_auth_context auth_context = gensec_krb5_state->auth_context;
1005         krb5_error_code ret;
1006         krb5_data input, output;
1007         input.length = in->length;
1008         input.data = (char *)in->data;
1009
1010         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
1011                 ret = krb5_mk_priv(context, auth_context, &input, &output, NULL);
1012                 if (ret) {
1013                         DEBUG(1, ("krb5_mk_priv failed: %s\n",
1014                                   smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
1015                                                              ret, mem_ctx)));
1016                         return NT_STATUS_ACCESS_DENIED;
1017                 }
1018                 *out = data_blob_talloc(mem_ctx, output.data, output.length);
1019
1020                 smb_krb5_free_data_contents(context, &output);
1021         } else {
1022                 return NT_STATUS_ACCESS_DENIED;
1023         }
1024         return NT_STATUS_OK;
1025 }
1026
1027 static NTSTATUS gensec_krb5_unwrap(struct gensec_security *gensec_security,
1028                                      TALLOC_CTX *mem_ctx,
1029                                      const DATA_BLOB *in,
1030                                      DATA_BLOB *out)
1031 {
1032         struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
1033         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
1034         krb5_auth_context auth_context = gensec_krb5_state->auth_context;
1035         krb5_error_code ret;
1036         krb5_data input, output;
1037         krb5_replay_data replay;
1038         input.length = in->length;
1039         input.data = (char *)in->data;
1040
1041         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
1042                 ret = krb5_rd_priv(context, auth_context, &input, &output, &replay);
1043                 if (ret) {
1044                         DEBUG(1, ("krb5_rd_priv failed: %s\n",
1045                                   smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
1046                                                              ret, mem_ctx)));
1047                         return NT_STATUS_ACCESS_DENIED;
1048                 }
1049                 *out = data_blob_talloc(mem_ctx, output.data, output.length);
1050
1051                 smb_krb5_free_data_contents(context, &output);
1052         } else {
1053                 return NT_STATUS_ACCESS_DENIED;
1054         }
1055         return NT_STATUS_OK;
1056 }
1057
1058 static bool gensec_krb5_have_feature(struct gensec_security *gensec_security,
1059                                      uint32_t feature)
1060 {
1061         struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
1062         if (feature & GENSEC_FEATURE_SESSION_KEY) {
1063                 return true;
1064         }
1065         if (gensec_krb5_state->gssapi) {
1066                 return false;
1067         }
1068
1069         /*
1070          * krb5_mk_priv provides SIGN and SEAL
1071          */
1072         if (feature & GENSEC_FEATURE_SIGN) {
1073                 return true;
1074         }
1075         if (feature & GENSEC_FEATURE_SEAL) {
1076                 return true;
1077         }
1078
1079         return false;
1080 }
1081
1082 static const char *gensec_krb5_final_auth_type(struct gensec_security *gensec_security)
1083 {
1084         return GENSEC_FINAL_AUTH_TYPE_KRB5;
1085 }
1086
1087 static const char *gensec_krb5_oids[] = {
1088         GENSEC_OID_KERBEROS5,
1089         GENSEC_OID_KERBEROS5_OLD,
1090         NULL
1091 };
1092
1093 static const struct gensec_security_ops gensec_fake_gssapi_krb5_security_ops = {
1094         .name           = "fake_gssapi_krb5",
1095         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
1096         .oid            = gensec_krb5_oids,
1097         .client_start   = gensec_fake_gssapi_krb5_client_start,
1098         .server_start   = gensec_fake_gssapi_krb5_server_start,
1099         .update_send    = gensec_krb5_update_send,
1100         .update_recv    = gensec_krb5_update_recv,
1101         .magic          = gensec_magic_check_krb5_oid,
1102         .session_key    = gensec_krb5_session_key,
1103         .session_info   = gensec_krb5_session_info,
1104         .have_feature   = gensec_krb5_have_feature,
1105         .final_auth_type = gensec_krb5_final_auth_type,
1106         .enabled        = false,
1107         .kerberos       = true,
1108         .priority       = GENSEC_KRB5,
1109 };
1110
1111 static const struct gensec_security_ops gensec_krb5_security_ops = {
1112         .name           = "krb5",
1113         .client_start   = gensec_krb5_client_start,
1114         .server_start   = gensec_krb5_server_start,
1115         .update_send    = gensec_krb5_update_send,
1116         .update_recv    = gensec_krb5_update_recv,
1117         .session_key    = gensec_krb5_session_key,
1118         .session_info   = gensec_krb5_session_info,
1119         .have_feature   = gensec_krb5_have_feature,
1120         .wrap           = gensec_krb5_wrap,
1121         .unwrap         = gensec_krb5_unwrap,
1122         .final_auth_type = gensec_krb5_final_auth_type,
1123         .enabled        = true,
1124         .kerberos       = true,
1125         .priority       = GENSEC_KRB5
1126 };
1127
1128 _PUBLIC_ NTSTATUS gensec_krb5_init(TALLOC_CTX *ctx)
1129 {
1130         NTSTATUS ret;
1131
1132         ret = gensec_register(ctx, &gensec_krb5_security_ops);
1133         if (!NT_STATUS_IS_OK(ret)) {
1134                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1135                         gensec_krb5_security_ops.name));
1136                 return ret;
1137         }
1138
1139         ret = gensec_register(ctx, &gensec_fake_gssapi_krb5_security_ops);
1140         if (!NT_STATUS_IS_OK(ret)) {
1141                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1142                         gensec_fake_gssapi_krb5_security_ops.name));
1143                 return ret;
1144         }
1145
1146         return ret;
1147 }