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(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->smb_krb5_context = NULL;
 117         gensec_krb5_state->auth_context = NULL;
 118         gensec_krb5_state->ticket = NULL;
 119         ZERO_STRUCT(gensec_krb5_state->enc_ticket);
 120         gensec_krb5_state->keyblock = NULL;
 121         gensec_krb5_state->gssapi = gssapi;
 122
 123         talloc_set_destructor(gensec_krb5_state, gensec_krb5_destroy);
 124
 125         if (cli_credentials_get_krb5_context(creds,
 126                                              gensec_security->settings->lp_ctx, &gensec_krb5_state->smb_krb5_context)) {
 127                 talloc_free(gensec_krb5_state);
 128                 return NT_STATUS_INTERNAL_ERROR;
 129         }
 130
 131         ret = krb5_auth_con_init(gensec_krb5_state->smb_krb5_context->krb5_context, &gensec_krb5_state->auth_context);
 132         if (ret) {
 133                 DEBUG(1,("gensec_krb5_start: krb5_auth_con_init failed (%s)\n",
 134                          smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 135                                                     ret, gensec_krb5_state)));
 136                 talloc_free(gensec_krb5_state);
 137                 return NT_STATUS_INTERNAL_ERROR;
 138         }
 139
 140         ret = krb5_auth_con_setflags(gensec_krb5_state->smb_krb5_context->krb5_context,
 141                                      gensec_krb5_state->auth_context,
 142                                      KRB5_AUTH_CONTEXT_DO_SEQUENCE);
 143         if (ret) {
 144                 DEBUG(1,("gensec_krb5_start: krb5_auth_con_setflags failed (%s)\n",
 145                          smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 146                                                     ret, gensec_krb5_state)));
 147                 talloc_free(gensec_krb5_state);
 148                 return NT_STATUS_INTERNAL_ERROR;
 149         }
 150
 151         tlocal_addr = gensec_get_local_address(gensec_security);
 152         if (tlocal_addr) {
 153                 ssize_t socklen;
 154                 struct sockaddr_storage ss;
 155                 bool ok;
 156
 157                 socklen = tsocket_address_bsd_sockaddr(tlocal_addr,
 158                                 (struct sockaddr *) &ss,
 159                                 sizeof(struct sockaddr_storage));
 160                 if (socklen < 0) {
 161                         talloc_free(gensec_krb5_state);
 162                         return NT_STATUS_INTERNAL_ERROR;
 163                 }
 164                 ok = smb_krb5_sockaddr_to_kaddr(&ss, &my_krb5_addr);
 165                 if (!ok) {
 166                         DBG_WARNING("smb_krb5_sockaddr_to_kaddr (local) failed\n");
 167                         talloc_free(gensec_krb5_state);
 168                         return NT_STATUS_INTERNAL_ERROR;
 169                 }
 170         }
 171
 172         tremote_addr = gensec_get_remote_address(gensec_security);
 173         if (tremote_addr) {
 174                 ssize_t socklen;
 175                 struct sockaddr_storage ss;
 176                 bool ok;
 177
 178                 socklen = tsocket_address_bsd_sockaddr(tremote_addr,
 179                                 (struct sockaddr *) &ss,
 180                                 sizeof(struct sockaddr_storage));
 181                 if (socklen < 0) {
 182                         talloc_free(gensec_krb5_state);
 183                         return NT_STATUS_INTERNAL_ERROR;
 184                 }
 185                 ok = smb_krb5_sockaddr_to_kaddr(&ss, &peer_krb5_addr);
 186                 if (!ok) {
 187                         DBG_WARNING("smb_krb5_sockaddr_to_kaddr (remote) failed\n");
 188                         talloc_free(gensec_krb5_state);
 189                         return NT_STATUS_INTERNAL_ERROR;
 190                 }
 191         }
 192
 193         ret = krb5_auth_con_setaddrs(gensec_krb5_state->smb_krb5_context->krb5_context,
 194                                      gensec_krb5_state->auth_context,
 195                                      tlocal_addr ? &my_krb5_addr : NULL,
 196                                      tremote_addr ? &peer_krb5_addr : NULL);
 197         if (ret) {
 198                 DEBUG(1,("gensec_krb5_start: krb5_auth_con_setaddrs failed (%s)\n",
 199                          smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 200                                                     ret, gensec_krb5_state)));
 201                 talloc_free(gensec_krb5_state);
 202                 return NT_STATUS_INTERNAL_ERROR;
 203         }
 204
 205         return NT_STATUS_OK;
 206 }
 207
 208 static NTSTATUS gensec_krb5_common_server_start(struct gensec_security *gensec_security, bool gssapi)
 209 {
 210         NTSTATUS nt_status;
 211         struct gensec_krb5_state *gensec_krb5_state;
 212
 213         nt_status = gensec_krb5_start(gensec_security, gssapi);
 214         if (!NT_STATUS_IS_OK(nt_status)) {
 215                 return nt_status;
 216         }
 217
 218         gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
 219         gensec_krb5_state->state_position = GENSEC_KRB5_SERVER_START;
 220
 221         return NT_STATUS_OK;
 222 }
 223
 224 static NTSTATUS gensec_krb5_server_start(struct gensec_security *gensec_security)
 225 {
 226         return gensec_krb5_common_server_start(gensec_security, false);
 227 }
 228
 229 static NTSTATUS gensec_fake_gssapi_krb5_server_start(struct gensec_security *gensec_security)
 230 {
 231         return gensec_krb5_common_server_start(gensec_security, true);
 232 }
 233
 234 static NTSTATUS gensec_krb5_common_client_start(struct gensec_security *gensec_security, bool gssapi)
 235 {
 236         const char *hostname;
 237         struct gensec_krb5_state *gensec_krb5_state;
 238         NTSTATUS nt_status;
 239         hostname = gensec_get_target_hostname(gensec_security);
 240         if (!hostname) {
 241                 DEBUG(3, ("No hostname for target computer passed in, cannot use kerberos for this connection\n"));
 242                 return NT_STATUS_INVALID_PARAMETER;
 243         }
 244         if (is_ipaddress(hostname)) {
 245                 DEBUG(2, ("Cannot do krb5 to an IP address"));
 246                 return NT_STATUS_INVALID_PARAMETER;
 247         }
 248         if (strcmp(hostname, "localhost") == 0) {
 249                 DEBUG(2, ("krb5 to 'localhost' does not make sense"));
 250                 return NT_STATUS_INVALID_PARAMETER;
 251         }
 252
 253         nt_status = gensec_krb5_start(gensec_security, gssapi);
 254         if (!NT_STATUS_IS_OK(nt_status)) {
 255                 return nt_status;
 256         }
 257
 258         gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
 259         gensec_krb5_state->state_position = GENSEC_KRB5_CLIENT_START;
 260         gensec_krb5_state->ap_req_options = AP_OPTS_USE_SUBKEY;
 261
 262         if (gensec_krb5_state->gssapi) {
 263                 /* The Fake GSSAPI model emulates Samba3, which does not do mutual authentication */
 264                 if (gensec_setting_bool(gensec_security->settings, "gensec_fake_gssapi_krb5", "mutual", false)) {
 265                         gensec_krb5_state->ap_req_options |= AP_OPTS_MUTUAL_REQUIRED;
 266                 }
 267         } else {
 268                 /* The wrapping for KPASSWD (a user of the raw KRB5 API) should be mutually authenticated */
 269                 if (gensec_setting_bool(gensec_security->settings, "gensec_krb5", "mutual", true)) {
 270                         gensec_krb5_state->ap_req_options |= AP_OPTS_MUTUAL_REQUIRED;
 271                 }
 272         }
 273         return NT_STATUS_OK;
 274 }
 275
 276 static NTSTATUS gensec_krb5_common_client_creds(struct gensec_security *gensec_security,
 277                                                 struct tevent_context *ev,
 278                                                 bool gssapi)
 279 {
 280         struct gensec_krb5_state *gensec_krb5_state;
 281         krb5_error_code ret;
 282         struct ccache_container *ccache_container;
 283         const char *error_string;
 284         const char *principal;
 285         const char *hostname;
 286         krb5_data in_data = { .length = 0 };
 287         krb5_data *in_data_p = NULL;
 288 #ifdef SAMBA4_USES_HEIMDAL
 289         struct tevent_context *previous_ev;
 290 #endif
 291
 292         if (lpcfg_parm_bool(gensec_security->settings->lp_ctx,
 293                             NULL, "gensec_krb5", "send_authenticator_checksum", true)) {
 294                 in_data_p = &in_data;
 295         }
 296
 297         gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
 298
 299         principal = gensec_get_target_principal(gensec_security);
 300         hostname = gensec_get_target_hostname(gensec_security);
 301
 302         ret = cli_credentials_get_ccache(gensec_get_credentials(gensec_security),
 303                                          ev,
 304                                          gensec_security->settings->lp_ctx, &ccache_container, &error_string);
 305         switch (ret) {
 306         case 0:
 307                 break;
 308         case KRB5KDC_ERR_PREAUTH_FAILED:
 309         case KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN:
 310                 return NT_STATUS_LOGON_FAILURE;
 311         case KRB5_KDC_UNREACH:
 312                 DEBUG(3, ("Cannot reach a KDC we require to contact %s: %s\n", principal, error_string));
 313                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 314         case KRB5_CC_NOTFOUND:
 315         case KRB5_CC_END:
 316                 DEBUG(3, ("Error preparing credentials we require to contact %s : %s\n", principal, error_string));
 317                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 318         default:
 319                 DEBUG(1, ("gensec_krb5_start: Aquiring initiator credentials failed: %s\n", error_string));
 320                 return NT_STATUS_UNSUCCESSFUL;
 321         }
 322
 323 #ifdef SAMBA4_USES_HEIMDAL
 324         /* Do this every time, in case we have weird recursive issues here */
 325         ret = smb_krb5_context_set_event_ctx(gensec_krb5_state->smb_krb5_context, ev, &previous_ev);
 326         if (ret != 0) {
 327                 DEBUG(1, ("gensec_krb5_start: Setting event context failed\n"));
 328                 return NT_STATUS_NO_MEMORY;
 329         }
 330 #endif
 331         if (principal) {
 332                 krb5_principal target_principal;
 333                 ret = krb5_parse_name(gensec_krb5_state->smb_krb5_context->krb5_context, principal,
 334                                       &target_principal);
 335                 if (ret == 0) {
 336                         krb5_creds this_cred;
 337                         krb5_creds *cred;
 338
 339                         ZERO_STRUCT(this_cred);
 340                         ret = krb5_cc_get_principal(gensec_krb5_state->smb_krb5_context->krb5_context,
 341                                                     ccache_container->ccache,
 342                                                     &this_cred.client);
 343                         if (ret != 0) {
 344                                 krb5_free_principal(gensec_krb5_state->smb_krb5_context->krb5_context,
 345                                                     target_principal);
 346                                 return NT_STATUS_UNSUCCESSFUL;
 347                         }
 348
 349                         ret = krb5_copy_principal(gensec_krb5_state->smb_krb5_context->krb5_context,
 350                                                   target_principal,
 351                                                   &this_cred.server);
 352                         krb5_free_principal(gensec_krb5_state->smb_krb5_context->krb5_context,
 353                                             target_principal);
 354                         if (ret != 0) {
 355                                 krb5_free_cred_contents(gensec_krb5_state->smb_krb5_context->krb5_context,
 356                                                         &this_cred);
 357                                 return NT_STATUS_UNSUCCESSFUL;
 358                         }
 359                         this_cred.times.endtime = 0;
 360
 361                         ret = krb5_get_credentials(gensec_krb5_state->smb_krb5_context->krb5_context,
 362                                                    0,
 363                                                    ccache_container->ccache,
 364                                                    &this_cred,
 365                                                    &cred);
 366                         krb5_free_cred_contents(gensec_krb5_state->smb_krb5_context->krb5_context,
 367                                                 &this_cred);
 368                         if (ret != 0) {
 369                                 return NT_STATUS_UNSUCCESSFUL;
 370                         }
 371
 372                         ret = krb5_mk_req_extended(gensec_krb5_state->smb_krb5_context->krb5_context,
 373                                                    &gensec_krb5_state->auth_context,
 374                                                    gensec_krb5_state->ap_req_options,
 375                                                    in_data_p,
 376                                                    cred,
 377                                                    &gensec_krb5_state->enc_ticket);
 378                 }
 379         } else {
 380                 ret = krb5_mk_req(gensec_krb5_state->smb_krb5_context->krb5_context,
 381                                   &gensec_krb5_state->auth_context,
 382                                   gensec_krb5_state->ap_req_options,
 383                                   discard_const_p(char, gensec_get_target_service(gensec_security)),
 384                                   discard_const_p(char, hostname),
 385                                   in_data_p, ccache_container->ccache,
 386                                   &gensec_krb5_state->enc_ticket);
 387         }
 388
 389 #ifdef SAMBA4_USES_HEIMDAL
 390         smb_krb5_context_remove_event_ctx(gensec_krb5_state->smb_krb5_context, previous_ev, ev);
 391 #endif
 392
 393         switch (ret) {
 394         case 0:
 395                 return NT_STATUS_OK;
 396         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 397                 DEBUG(3, ("Server [%s] is not registered with our KDC: %s\n",
 398                           hostname, smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 399                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 400         case KRB5_KDC_UNREACH:
 401                 DEBUG(3, ("Cannot reach a KDC we require to contact host [%s]: %s\n",
 402                           hostname, smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 403                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 404         case KRB5KDC_ERR_PREAUTH_FAILED:
 405         case KRB5KRB_AP_ERR_TKT_EXPIRED:
 406         case KRB5_CC_END:
 407                 /* Too much clock skew - we will need to kinit to re-skew the clock */
 408         case KRB5KRB_AP_ERR_SKEW:
 409         case KRB5_KDCREP_SKEW:
 410                 DEBUG(3, ("kerberos (mk_req) failed: %s\n",
 411                           smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 412                 FALL_THROUGH;
 413         /* just don't print a message for these really ordinary messages */
 414         case KRB5_FCC_NOFILE:
 415         case KRB5_CC_NOTFOUND:
 416         case ENOENT:
 417
 418                 return NT_STATUS_UNSUCCESSFUL;
 419                 break;
 420
 421         default:
 422                 DEBUG(0, ("kerberos: %s\n",
 423                           smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 424                 return NT_STATUS_UNSUCCESSFUL;
 425         }
 426 }
 427
 428 static NTSTATUS gensec_krb5_client_start(struct gensec_security *gensec_security)
 429 {
 430         return gensec_krb5_common_client_start(gensec_security, false);
 431 }
 432
 433 static NTSTATUS gensec_fake_gssapi_krb5_client_start(struct gensec_security *gensec_security)
 434 {
 435         return gensec_krb5_common_client_start(gensec_security, true);
 436 }
 437
 438
 439 /*
 440   generate a krb5 GSS-API wrapper packet given a ticket
 441 */
 442 static DATA_BLOB gensec_gssapi_gen_krb5_wrap(TALLOC_CTX *mem_ctx, const DATA_BLOB *ticket, const uint8_t tok_id[2])
 443 {
 444         struct asn1_data *data;
 445         DATA_BLOB ret = data_blob_null;
 446
 447         data = asn1_init(mem_ctx);
 448         if (!data || !ticket->data) {
 449                 return ret;
 450         }
 451
 452         if (!asn1_push_tag(data, ASN1_APPLICATION(0))) goto err;
 453         if (!asn1_write_OID(data, GENSEC_OID_KERBEROS5)) goto err;
 454
 455         if (!asn1_write(data, tok_id, 2)) goto err;
 456         if (!asn1_write(data, ticket->data, ticket->length)) goto err;
 457         if (!asn1_pop_tag(data)) goto err;
 458
 459
 460         if (!asn1_extract_blob(data, mem_ctx, &ret)) {
 461                 goto err;
 462         }
 463         asn1_free(data);
 464
 465         return ret;
 466
 467   err:
 468
 469         DEBUG(1, ("Failed to build krb5 wrapper at offset %d\n",
 470                   (int)asn1_current_ofs(data)));
 471         asn1_free(data);
 472         return ret;
 473 }
 474
 475 /*
 476   parse a krb5 GSS-API wrapper packet giving a ticket
 477 */
 478 static bool gensec_gssapi_parse_krb5_wrap(TALLOC_CTX *mem_ctx, const DATA_BLOB *blob, DATA_BLOB *ticket, uint8_t tok_id[2])
 479 {
 480         bool ret = false;
 481         struct asn1_data *data = asn1_init(mem_ctx);
 482         int data_remaining;
 483
 484         if (!data) {
 485                 return false;
 486         }
 487
 488         if (!asn1_load(data, *blob)) goto err;
 489         if (!asn1_start_tag(data, ASN1_APPLICATION(0))) goto err;
 490         if (!asn1_check_OID(data, GENSEC_OID_KERBEROS5)) goto err;
 491
 492         data_remaining = asn1_tag_remaining(data);
 493
 494         if (data_remaining < 3) {
 495                 asn1_set_error(data);
 496         } else {
 497                 if (!asn1_read(data, tok_id, 2)) goto err;
 498                 data_remaining -= 2;
 499                 *ticket = data_blob_talloc(mem_ctx, NULL, data_remaining);
 500                 if (!asn1_read(data, ticket->data, ticket->length)) goto err;
 501         }
 502
 503         if (!asn1_end_tag(data)) goto err;
 504
 505         ret = !asn1_has_error(data);
 506
 507   err:
 508
 509         asn1_free(data);
 510
 511         return ret;
 512 }
 513
 514 static NTSTATUS gensec_krb5_update_internal(struct gensec_security *gensec_security,
 515                                             TALLOC_CTX *out_mem_ctx,
 516                                             struct tevent_context *ev,
 517                                             const DATA_BLOB in, DATA_BLOB *out)
 518 {
 519         struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
 520         krb5_error_code ret = 0;
 521         NTSTATUS nt_status;
 522
 523         switch (gensec_krb5_state->state_position) {
 524         case GENSEC_KRB5_CLIENT_START:
 525         {
 526                 DATA_BLOB unwrapped_out;
 527
 528                 nt_status = gensec_krb5_common_client_creds(gensec_security, ev, gensec_krb5_state->gssapi);
 529                 if (!NT_STATUS_IS_OK(nt_status)) {
 530                         return nt_status;
 531                 }
 532
 533                 if (gensec_krb5_state->gssapi) {
 534                         unwrapped_out = data_blob_talloc(out_mem_ctx, gensec_krb5_state->enc_ticket.data, gensec_krb5_state->enc_ticket.length);
 535
 536                         /* wrap that up in a nice GSS-API wrapping */
 537                         *out = gensec_gssapi_gen_krb5_wrap(out_mem_ctx, &unwrapped_out, TOK_ID_KRB_AP_REQ);
 538                 } else {
 539                         *out = data_blob_talloc(out_mem_ctx, gensec_krb5_state->enc_ticket.data, gensec_krb5_state->enc_ticket.length);
 540                 }
 541                 if (gensec_krb5_state->ap_req_options & AP_OPTS_MUTUAL_REQUIRED) {
 542                         gensec_krb5_state->state_position = GENSEC_KRB5_CLIENT_MUTUAL_AUTH;
 543                         nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 544                 } else {
 545                         gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
 546                         nt_status = NT_STATUS_OK;
 547                 }
 548                 return nt_status;
 549         }
 550
 551         case GENSEC_KRB5_CLIENT_MUTUAL_AUTH:
 552         {
 553                 DATA_BLOB unwrapped_in;
 554                 krb5_data inbuf;
 555                 krb5_ap_rep_enc_part *repl = NULL;
 556                 uint8_t tok_id[2];
 557
 558                 if (gensec_krb5_state->gssapi) {
 559                         if (!gensec_gssapi_parse_krb5_wrap(out_mem_ctx, &in, &unwrapped_in, tok_id)) {
 560                                 DEBUG(1,("gensec_gssapi_parse_krb5_wrap(mutual authentication) failed to parse\n"));
 561                                 dump_data_pw("Mutual authentication message:\n", in.data, in.length);
 562                                 return NT_STATUS_INVALID_PARAMETER;
 563                         }
 564                 } else {
 565                         unwrapped_in = in;
 566                 }
 567                 /* TODO: check the tok_id */
 568
 569                 inbuf.data = (char *)unwrapped_in.data;
 570                 inbuf.length = unwrapped_in.length;
 571                 ret = krb5_rd_rep(gensec_krb5_state->smb_krb5_context->krb5_context,
 572                                   gensec_krb5_state->auth_context,
 573                                   &inbuf, &repl);
 574                 if (ret) {
 575                         DEBUG(1,("krb5_rd_rep (mutual authentication) failed (%s)\n",
 576                                  smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, out_mem_ctx)));
 577                         dump_data_pw("Mutual authentication message:\n", (uint8_t *)inbuf.data, inbuf.length);
 578                         nt_status = NT_STATUS_ACCESS_DENIED;
 579                 } else {
 580                         *out = data_blob(NULL, 0);
 581                         nt_status = NT_STATUS_OK;
 582                         gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
 583                 }
 584                 if (repl) {
 585                         krb5_free_ap_rep_enc_part(gensec_krb5_state->smb_krb5_context->krb5_context, repl);
 586                 }
 587                 return nt_status;
 588         }
 589
 590         case GENSEC_KRB5_SERVER_START:
 591         {
 592                 DATA_BLOB unwrapped_in;
 593                 DATA_BLOB unwrapped_out = data_blob(NULL, 0);
 594                 krb5_data inbuf, outbuf;
 595                 uint8_t tok_id[2];
 596                 struct keytab_container *keytab;
 597                 krb5_principal server_in_keytab;
 598                 const char *error_string;
 599                 enum credentials_obtained obtained;
 600
 601                 if (!in.data) {
 602                         return NT_STATUS_INVALID_PARAMETER;
 603                 }
 604
 605                 /* Grab the keytab, however generated */
 606                 ret = cli_credentials_get_keytab(gensec_get_credentials(gensec_security),
 607                                                  gensec_security->settings->lp_ctx, &keytab);
 608                 if (ret) {
 609                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 610                 }
 611
 612                 /* This ensures we lookup the correct entry in that
 613                  * keytab.  A NULL principal is acceptable, and means
 614                  * that the krb5 libs should search the keytab at
 615                  * accept time for any matching key */
 616                 ret = principal_from_credentials(out_mem_ctx, gensec_get_credentials(gensec_security),
 617                                                  gensec_krb5_state->smb_krb5_context,
 618                                                  &server_in_keytab, &obtained, &error_string);
 619
 620                 if (ret) {
 621                         DEBUG(2,("Failed to make credentials from principal: %s\n", error_string));
 622                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 623                 }
 624
 625                 if (keytab->password_based || obtained < CRED_SPECIFIED) {
 626                         /*
 627                          * Use match-by-key in this case (matches
 628                          * cli_credentials_get_server_gss_creds()
 629                          * behaviour).  No need to free the memory,
 630                          * this is handled with a talloc destructor.
 631                          */
 632                         server_in_keytab = NULL;
 633                 }
 634
 635                 /* Parse the GSSAPI wrapping, if it's there... (win2k3 allows it to be omited) */
 636                 if (gensec_krb5_state->gssapi
 637                     && gensec_gssapi_parse_krb5_wrap(out_mem_ctx, &in, &unwrapped_in, tok_id)) {
 638                         inbuf.data = (char *)unwrapped_in.data;
 639                         inbuf.length = unwrapped_in.length;
 640                 } else {
 641                         inbuf.data = (char *)in.data;
 642                         inbuf.length = in.length;
 643                 }
 644
 645                 ret = smb_krb5_rd_req_decoded(gensec_krb5_state->smb_krb5_context->krb5_context,
 646                                               &gensec_krb5_state->auth_context,
 647                                               &inbuf,
 648                                               keytab->keytab,
 649                                               server_in_keytab,
 650                                               &outbuf,
 651                                               &gensec_krb5_state->ticket,
 652                                               &gensec_krb5_state->keyblock);
 653
 654                 if (ret) {
 655                         DBG_WARNING("smb_krb5_rd_req_decoded failed\n");
 656                         return NT_STATUS_LOGON_FAILURE;
 657                 }
 658                 unwrapped_out.data = (uint8_t *)outbuf.data;
 659                 unwrapped_out.length = outbuf.length;
 660                 gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
 661                 /* wrap that up in a nice GSS-API wrapping */
 662                 if (gensec_krb5_state->gssapi) {
 663                         *out = gensec_gssapi_gen_krb5_wrap(out_mem_ctx, &unwrapped_out, TOK_ID_KRB_AP_REP);
 664                 } else {
 665                         *out = data_blob_talloc(out_mem_ctx, outbuf.data, outbuf.length);
 666                 }
 667                 smb_krb5_free_data_contents(gensec_krb5_state->smb_krb5_context->krb5_context,
 668                                             &outbuf);
 669                 return NT_STATUS_OK;
 670         }
 671
 672         case GENSEC_KRB5_DONE:
 673         default:
 674                 /* Asking too many times... */
 675                 return NT_STATUS_INVALID_PARAMETER;
 676         }
 677 }
 678
 679 struct gensec_krb5_update_state {
 680         NTSTATUS status;
 681         DATA_BLOB out;
 682 };
 683
 684 static struct tevent_req *gensec_krb5_update_send(TALLOC_CTX *mem_ctx,
 685                                                   struct tevent_context *ev,
 686                                                   struct gensec_security *gensec_security,
 687                                                   const DATA_BLOB in)
 688 {
 689         struct tevent_req *req = NULL;
 690         struct gensec_krb5_update_state *state = NULL;
 691         NTSTATUS status;
 692
 693         req = tevent_req_create(mem_ctx, &state,
 694                                 struct gensec_krb5_update_state);
 695         if (req == NULL) {
 696                 return NULL;
 697         }
 698
 699         status = gensec_krb5_update_internal(gensec_security,
 700                                              state, ev, in,
 701                                              &state->out);
 702         state->status = status;
 703         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 704                 tevent_req_done(req);
 705                 return tevent_req_post(req, ev);
 706         }
 707         if (tevent_req_nterror(req, status)) {
 708                 return tevent_req_post(req, ev);
 709         }
 710
 711         tevent_req_done(req);
 712         return tevent_req_post(req, ev);
 713 }
 714
 715 static NTSTATUS gensec_krb5_update_recv(struct tevent_req *req,
 716                                         TALLOC_CTX *out_mem_ctx,
 717                                         DATA_BLOB *out)
 718 {
 719         struct gensec_krb5_update_state *state =
 720                 tevent_req_data(req,
 721                 struct gensec_krb5_update_state);
 722         NTSTATUS status;
 723
 724         *out = data_blob_null;
 725
 726         if (tevent_req_is_nterror(req, &status)) {
 727                 tevent_req_received(req);
 728                 return status;
 729         }
 730
 731         *out = state->out;
 732         talloc_steal(out_mem_ctx, state->out.data);
 733         status = state->status;
 734         tevent_req_received(req);
 735         return status;
 736 }
 737
 738 static NTSTATUS gensec_krb5_session_key(struct gensec_security *gensec_security,
 739                                         TALLOC_CTX *mem_ctx,
 740                                         DATA_BLOB *session_key)
 741 {
 742         struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
 743         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
 744         krb5_auth_context auth_context = gensec_krb5_state->auth_context;
 745         krb5_error_code err = -1;
 746         bool remote = false;
 747         bool ok;
 748
 749         if (gensec_krb5_state->state_position != GENSEC_KRB5_DONE) {
 750                 return NT_STATUS_NO_USER_SESSION_KEY;
 751         }
 752
 753         switch (gensec_security->gensec_role) {
 754         case GENSEC_CLIENT:
 755                 remote = false;
 756                 break;
 757         case GENSEC_SERVER:
 758                 remote = true;
 759                 break;
 760         }
 761
 762         ok = smb_krb5_get_smb_session_key(mem_ctx,
 763                                           context,
 764                                           auth_context,
 765                                           session_key,
 766                                           remote);
 767         if (!ok) {
 768                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 769                 return NT_STATUS_NO_USER_SESSION_KEY;
 770         }
 771
 772         return NT_STATUS_OK;
 773 }
 774
 775 #ifdef SAMBA4_USES_HEIMDAL
 776 static NTSTATUS gensec_krb5_session_info(struct gensec_security *gensec_security,
 777                                          TALLOC_CTX *mem_ctx,
 778                                          struct auth_session_info **_session_info)
 779 {
 780         NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
 781         struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
 782         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
 783         struct auth_session_info *session_info = NULL;
 784
 785         krb5_principal client_principal;
 786         char *principal_string = NULL;
 787
 788         DATA_BLOB pac_blob, *pac_blob_ptr = NULL;
 789         krb5_data pac_data;
 790
 791         krb5_error_code ret;
 792
 793         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 794         if (!tmp_ctx) {
 795                 return NT_STATUS_NO_MEMORY;
 796         }
 797
 798         ret = krb5_ticket_get_client(context, gensec_krb5_state->ticket, &client_principal);
 799         if (ret) {
 800                 DEBUG(5, ("krb5_ticket_get_client failed to get client principal: %s\n",
 801                           smb_get_krb5_error_message(context,
 802                                                      ret, tmp_ctx)));
 803                 talloc_free(tmp_ctx);
 804                 return NT_STATUS_NO_MEMORY;
 805         }
 806
 807         ret = krb5_unparse_name(gensec_krb5_state->smb_krb5_context->krb5_context,
 808                                 client_principal, &principal_string);
 809         if (ret) {
 810                 DEBUG(1, ("Unable to parse client principal: %s\n",
 811                           smb_get_krb5_error_message(context,
 812                                                      ret, tmp_ctx)));
 813                 krb5_free_principal(context, client_principal);
 814                 talloc_free(tmp_ctx);
 815                 return NT_STATUS_NO_MEMORY;
 816         }
 817
 818         ret = krb5_ticket_get_authorization_data_type(context, gensec_krb5_state->ticket,
 819                                                       KRB5_AUTHDATA_WIN2K_PAC,
 820                                                       &pac_data);
 821
 822         if (ret) {
 823                 /* NO pac */
 824                 DEBUG(5, ("krb5_ticket_get_authorization_data_type failed to find PAC: %s\n",
 825                           smb_get_krb5_error_message(context,
 826                                                      ret, tmp_ctx)));
 827         } else {
 828                 /* Found pac */
 829                 pac_blob = data_blob_talloc(tmp_ctx, pac_data.data, pac_data.length);
 830                 smb_krb5_free_data_contents(context, &pac_data);
 831                 if (!pac_blob.data) {
 832                         free(principal_string);
 833                         krb5_free_principal(context, client_principal);
 834                         talloc_free(tmp_ctx);
 835                         return NT_STATUS_NO_MEMORY;
 836                 }
 837
 838                 /* decode and verify the pac */
 839                 nt_status = kerberos_decode_pac(gensec_krb5_state,
 840                                                 pac_blob,
 841                                                 gensec_krb5_state->smb_krb5_context->krb5_context,
 842                                                 NULL, gensec_krb5_state->keyblock,
 843                                                 client_principal,
 844                                                 gensec_krb5_state->ticket->ticket.authtime, NULL);
 845
 846                 if (!NT_STATUS_IS_OK(nt_status)) {
 847                         free(principal_string);
 848                         krb5_free_principal(context, client_principal);
 849                         talloc_free(tmp_ctx);
 850                         return nt_status;
 851                 }
 852
 853                 pac_blob_ptr = &pac_blob;
 854         }
 855
 856         nt_status = gensec_generate_session_info_pac(tmp_ctx,
 857                                                      gensec_security,
 858                                                      gensec_krb5_state->smb_krb5_context,
 859                                                      pac_blob_ptr, principal_string,
 860                                                      gensec_get_remote_address(gensec_security),
 861                                                      &session_info);
 862
 863         free(principal_string);
 864         krb5_free_principal(context, client_principal);
 865
 866         if (!NT_STATUS_IS_OK(nt_status)) {
 867                 talloc_free(tmp_ctx);
 868                 return nt_status;
 869         }
 870
 871         nt_status = gensec_krb5_session_key(gensec_security, session_info, &session_info->session_key);
 872
 873         if (!NT_STATUS_IS_OK(nt_status)) {
 874                 talloc_free(tmp_ctx);
 875                 return nt_status;
 876         }
 877
 878         *_session_info = talloc_steal(mem_ctx, session_info);
 879
 880         talloc_free(tmp_ctx);
 881         return NT_STATUS_OK;
 882 }
 883 #else /* MIT KERBEROS */
 884 static NTSTATUS gensec_krb5_session_info(struct gensec_security *gensec_security,
 885                                          TALLOC_CTX *mem_ctx,
 886                                          struct auth_session_info **psession_info)
 887 {
 888         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
 889         struct gensec_krb5_state *gensec_krb5_state =
 890                 (struct gensec_krb5_state *)gensec_security->private_data;
 891         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
 892         struct auth_session_info *session_info = NULL;
 893
 894         krb5_principal client_principal;
 895         char *principal_string = NULL;
 896
 897         krb5_authdata **auth_pac_data = NULL;
 898         DATA_BLOB pac_blob, *pac_blob_ptr = NULL;
 899
 900         krb5_error_code code;
 901
 902         TALLOC_CTX *tmp_ctx;
 903
 904         tmp_ctx = talloc_new(mem_ctx);
 905         if (tmp_ctx == NULL) {
 906                 return NT_STATUS_NO_MEMORY;
 907         }
 908
 909         code = krb5_copy_principal(context,
 910                                    gensec_krb5_state->ticket->enc_part2->client,
 911                                    &client_principal);
 912         if (code != 0) {
 913                 DBG_INFO("krb5_copy_principal failed to copy client "
 914                          "principal: %s\n",
 915                          smb_get_krb5_error_message(context, code, tmp_ctx));
 916                 talloc_free(tmp_ctx);
 917                 return NT_STATUS_NO_MEMORY;
 918         }
 919
 920         code = krb5_unparse_name(context, client_principal, &principal_string);
 921         if (code != 0) {
 922                 DBG_WARNING("Unable to parse client principal: %s\n",
 923                             smb_get_krb5_error_message(context, code, tmp_ctx));
 924                 krb5_free_principal(context, client_principal);
 925                 talloc_free(tmp_ctx);
 926                 return NT_STATUS_NO_MEMORY;
 927         }
 928
 929         code = krb5_find_authdata(context,
 930                                   gensec_krb5_state->ticket->enc_part2->authorization_data,
 931                                   NULL,
 932                                   KRB5_AUTHDATA_WIN2K_PAC,
 933                                   &auth_pac_data);
 934         if (code != 0) {
 935                 /* NO pac */
 936                 DBG_INFO("krb5_find_authdata failed to find PAC: %s\n",
 937                          smb_get_krb5_error_message(context, code, tmp_ctx));
 938         } else {
 939                 krb5_timestamp ticket_authtime =
 940                         gensec_krb5_state->ticket->enc_part2->times.authtime;
 941
 942                 /* Found pac */
 943                 pac_blob = data_blob_talloc(tmp_ctx,
 944                                             auth_pac_data[0]->contents,
 945                                             auth_pac_data[0]->length);
 946                 krb5_free_authdata(context, auth_pac_data);
 947                 if (pac_blob.data == NULL) {
 948                         free(principal_string);
 949                         krb5_free_principal(context, client_principal);
 950                         talloc_free(tmp_ctx);
 951                         return NT_STATUS_NO_MEMORY;
 952                 }
 953
 954                 /* decode and verify the pac */
 955                 status = kerberos_decode_pac(gensec_krb5_state,
 956                                              pac_blob,
 957                                              context,
 958                                              NULL,
 959                                              gensec_krb5_state->keyblock,
 960                                              client_principal,
 961                                              ticket_authtime,
 962                                              NULL);
 963
 964                 if (!NT_STATUS_IS_OK(status)) {
 965                         free(principal_string);
 966                         krb5_free_principal(context, client_principal);
 967                         talloc_free(tmp_ctx);
 968                         return status;
 969                 }
 970
 971                 pac_blob_ptr = &pac_blob;
 972         }
 973         krb5_free_principal(context, client_principal);
 974
 975         status = gensec_generate_session_info_pac(tmp_ctx,
 976                                                   gensec_security,
 977                                                   gensec_krb5_state->smb_krb5_context,
 978                                                   pac_blob_ptr,
 979                                                   principal_string,
 980                                                   gensec_get_remote_address(gensec_security),
 981                                                   &session_info);
 982         SAFE_FREE(principal_string);
 983         if (!NT_STATUS_IS_OK(status)) {
 984                 talloc_free(tmp_ctx);
 985                 return status;
 986         }
 987
 988         status = gensec_krb5_session_key(gensec_security,
 989                                          session_info,
 990                                          &session_info->session_key);
 991         if (!NT_STATUS_IS_OK(status)) {
 992                 talloc_free(tmp_ctx);
 993                 return status;
 994         }
 995
 996         *psession_info = talloc_steal(mem_ctx, session_info);
 997         talloc_free(tmp_ctx);
 998
 999         return NT_STATUS_OK;
1000 }
1001 #endif /* SAMBA4_USES_HEIMDAL */
1002
1003 static NTSTATUS gensec_krb5_wrap(struct gensec_security *gensec_security,
1004                                    TALLOC_CTX *mem_ctx,
1005                                    const DATA_BLOB *in,
1006                                    DATA_BLOB *out)
1007 {
1008         struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
1009         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
1010         krb5_auth_context auth_context = gensec_krb5_state->auth_context;
1011         krb5_error_code ret;
1012         krb5_data input, output;
1013         input.length = in->length;
1014         input.data = (char *)in->data;
1015
1016         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
1017                 ret = krb5_mk_priv(context, auth_context, &input, &output, NULL);
1018                 if (ret) {
1019                         DEBUG(1, ("krb5_mk_priv failed: %s\n",
1020                                   smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
1021                                                              ret, mem_ctx)));
1022                         return NT_STATUS_ACCESS_DENIED;
1023                 }
1024                 *out = data_blob_talloc(mem_ctx, output.data, output.length);
1025
1026                 smb_krb5_free_data_contents(context, &output);
1027         } else {
1028                 return NT_STATUS_ACCESS_DENIED;
1029         }
1030         return NT_STATUS_OK;
1031 }
1032
1033 static NTSTATUS gensec_krb5_unwrap(struct gensec_security *gensec_security,
1034                                      TALLOC_CTX *mem_ctx,
1035                                      const DATA_BLOB *in,
1036                                      DATA_BLOB *out)
1037 {
1038         struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
1039         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
1040         krb5_auth_context auth_context = gensec_krb5_state->auth_context;
1041         krb5_error_code ret;
1042         krb5_data input, output;
1043         krb5_replay_data replay;
1044         input.length = in->length;
1045         input.data = (char *)in->data;
1046
1047         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
1048                 ret = krb5_rd_priv(context, auth_context, &input, &output, &replay);
1049                 if (ret) {
1050                         DEBUG(1, ("krb5_rd_priv failed: %s\n",
1051                                   smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
1052                                                              ret, mem_ctx)));
1053                         return NT_STATUS_ACCESS_DENIED;
1054                 }
1055                 *out = data_blob_talloc(mem_ctx, output.data, output.length);
1056
1057                 smb_krb5_free_data_contents(context, &output);
1058         } else {
1059                 return NT_STATUS_ACCESS_DENIED;
1060         }
1061         return NT_STATUS_OK;
1062 }
1063
1064 static bool gensec_krb5_have_feature(struct gensec_security *gensec_security,
1065                                      uint32_t feature)
1066 {
1067         struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
1068         if (feature & GENSEC_FEATURE_SESSION_KEY) {
1069                 return true;
1070         }
1071         if (gensec_krb5_state->gssapi) {
1072                 return false;
1073         }
1074
1075         /*
1076          * krb5_mk_priv provides SIGN and SEAL
1077          */
1078         if (feature & GENSEC_FEATURE_SIGN) {
1079                 return true;
1080         }
1081         if (feature & GENSEC_FEATURE_SEAL) {
1082                 return true;
1083         }
1084
1085         return false;
1086 }
1087
1088 static const char *gensec_krb5_final_auth_type(struct gensec_security *gensec_security)
1089 {
1090         return GENSEC_FINAL_AUTH_TYPE_KRB5;
1091 }
1092
1093 static const char *gensec_krb5_oids[] = {
1094         GENSEC_OID_KERBEROS5,
1095         GENSEC_OID_KERBEROS5_OLD,
1096         NULL
1097 };
1098
1099 static const struct gensec_security_ops gensec_fake_gssapi_krb5_security_ops = {
1100         .name           = "fake_gssapi_krb5",
1101         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
1102         .oid            = gensec_krb5_oids,
1103         .client_start   = gensec_fake_gssapi_krb5_client_start,
1104         .server_start   = gensec_fake_gssapi_krb5_server_start,
1105         .update_send    = gensec_krb5_update_send,
1106         .update_recv    = gensec_krb5_update_recv,
1107         .magic          = gensec_magic_check_krb5_oid,
1108         .session_key    = gensec_krb5_session_key,
1109         .session_info   = gensec_krb5_session_info,
1110         .have_feature   = gensec_krb5_have_feature,
1111         .final_auth_type = gensec_krb5_final_auth_type,
1112         .enabled        = false,
1113         .kerberos       = true,
1114         .priority       = GENSEC_KRB5,
1115 };
1116
1117 static const struct gensec_security_ops gensec_krb5_security_ops = {
1118         .name           = "krb5",
1119         .client_start   = gensec_krb5_client_start,
1120         .server_start   = gensec_krb5_server_start,
1121         .update_send    = gensec_krb5_update_send,
1122         .update_recv    = gensec_krb5_update_recv,
1123         .session_key    = gensec_krb5_session_key,
1124         .session_info   = gensec_krb5_session_info,
1125         .have_feature   = gensec_krb5_have_feature,
1126         .wrap           = gensec_krb5_wrap,
1127         .unwrap         = gensec_krb5_unwrap,
1128         .final_auth_type = gensec_krb5_final_auth_type,
1129         .enabled        = true,
1130         .kerberos       = true,
1131         .priority       = GENSEC_KRB5
1132 };
1133
1134 _PUBLIC_ NTSTATUS gensec_krb5_init(TALLOC_CTX *ctx)
1135 {
1136         NTSTATUS ret;
1137
1138         ret = gensec_register(ctx, &gensec_krb5_security_ops);
1139         if (!NT_STATUS_IS_OK(ret)) {
1140                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1141                         gensec_krb5_security_ops.name));
1142                 return ret;
1143         }
1144
1145         ret = gensec_register(ctx, &gensec_fake_gssapi_krb5_security_ops);
1146         if (!NT_STATUS_IS_OK(ret)) {
1147                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1148                         gensec_fake_gssapi_krb5_security_ops.name));
1149                 return ret;
1150         }
1151
1152         return ret;
1153 }