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 #include "gensec_krb5_internal.h"
  48 #include "gensec_krb5_helpers.h"
  49
  50 _PUBLIC_ NTSTATUS gensec_krb5_init(TALLOC_CTX *);
  51
  52 static int gensec_krb5_destroy(struct gensec_krb5_state *gensec_krb5_state)
  53 {
  54         if (!gensec_krb5_state->smb_krb5_context) {
  55                 /* We can't clean anything else up unless we started up this far */
  56                 return 0;
  57         }
  58         if (gensec_krb5_state->enc_ticket.length) {
  59                 smb_krb5_free_data_contents(gensec_krb5_state->smb_krb5_context->krb5_context,
  60                                             &gensec_krb5_state->enc_ticket);
  61         }
  62
  63         if (gensec_krb5_state->ticket) {
  64                 krb5_free_ticket(gensec_krb5_state->smb_krb5_context->krb5_context,
  65                                  gensec_krb5_state->ticket);
  66         }
  67
  68         /* ccache freed in a child destructor */
  69
  70         krb5_free_keyblock(gensec_krb5_state->smb_krb5_context->krb5_context,
  71                            gensec_krb5_state->keyblock);
  72
  73         if (gensec_krb5_state->auth_context) {
  74                 krb5_auth_con_free(gensec_krb5_state->smb_krb5_context->krb5_context,
  75                                    gensec_krb5_state->auth_context);
  76         }
  77
  78         return 0;
  79 }
  80
  81 static NTSTATUS gensec_krb5_start(struct gensec_security *gensec_security, bool gssapi)
  82 {
  83         krb5_error_code ret;
  84         struct gensec_krb5_state *gensec_krb5_state;
  85         struct cli_credentials *creds;
  86         const struct tsocket_address *tlocal_addr, *tremote_addr;
  87         krb5_address my_krb5_addr, peer_krb5_addr;
  88
  89         creds = gensec_get_credentials(gensec_security);
  90         if (!creds) {
  91                 return NT_STATUS_INVALID_PARAMETER;
  92         }
  93
  94         gensec_krb5_state = talloc_zero(gensec_security, struct gensec_krb5_state);
  95         if (!gensec_krb5_state) {
  96                 return NT_STATUS_NO_MEMORY;
  97         }
  98
  99         gensec_security->private_data = gensec_krb5_state;
 100         gensec_krb5_state->gssapi = gssapi;
 101
 102         talloc_set_destructor(gensec_krb5_state, gensec_krb5_destroy);
 103
 104         if (cli_credentials_get_krb5_context(creds,
 105                                              gensec_security->settings->lp_ctx, &gensec_krb5_state->smb_krb5_context)) {
 106                 talloc_free(gensec_krb5_state);
 107                 return NT_STATUS_INTERNAL_ERROR;
 108         }
 109
 110         ret = krb5_auth_con_init(gensec_krb5_state->smb_krb5_context->krb5_context, &gensec_krb5_state->auth_context);
 111         if (ret) {
 112                 DEBUG(1,("gensec_krb5_start: krb5_auth_con_init failed (%s)\n",
 113                          smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 114                                                     ret, gensec_krb5_state)));
 115                 talloc_free(gensec_krb5_state);
 116                 return NT_STATUS_INTERNAL_ERROR;
 117         }
 118
 119         ret = krb5_auth_con_setflags(gensec_krb5_state->smb_krb5_context->krb5_context,
 120                                      gensec_krb5_state->auth_context,
 121                                      KRB5_AUTH_CONTEXT_DO_SEQUENCE);
 122         if (ret) {
 123                 DEBUG(1,("gensec_krb5_start: krb5_auth_con_setflags failed (%s)\n",
 124                          smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 125                                                     ret, gensec_krb5_state)));
 126                 talloc_free(gensec_krb5_state);
 127                 return NT_STATUS_INTERNAL_ERROR;
 128         }
 129
 130         tlocal_addr = gensec_get_local_address(gensec_security);
 131         if (tlocal_addr) {
 132                 ssize_t sockaddr_ret;
 133                 struct samba_sockaddr addr;
 134                 bool ok;
 135
 136                 addr.sa_socklen = sizeof(addr.u);
 137                 sockaddr_ret = tsocket_address_bsd_sockaddr(
 138                         tlocal_addr, &addr.u.sa, addr.sa_socklen);
 139                 if (sockaddr_ret < 0) {
 140                         talloc_free(gensec_krb5_state);
 141                         return NT_STATUS_INTERNAL_ERROR;
 142                 }
 143                 addr.sa_socklen = sockaddr_ret;
 144                 ok = smb_krb5_sockaddr_to_kaddr(&addr.u.ss, &my_krb5_addr);
 145                 if (!ok) {
 146                         DBG_WARNING("smb_krb5_sockaddr_to_kaddr (local) failed\n");
 147                         talloc_free(gensec_krb5_state);
 148                         return NT_STATUS_INTERNAL_ERROR;
 149                 }
 150         }
 151
 152         tremote_addr = gensec_get_remote_address(gensec_security);
 153         if (tremote_addr) {
 154                 ssize_t sockaddr_ret;
 155                 struct samba_sockaddr addr;
 156                 bool ok;
 157
 158                 addr.sa_socklen = sizeof(addr.u);
 159                 sockaddr_ret = tsocket_address_bsd_sockaddr(
 160                         tremote_addr, &addr.u.sa, addr.sa_socklen);
 161                 if (sockaddr_ret < 0) {
 162                         talloc_free(gensec_krb5_state);
 163                         return NT_STATUS_INTERNAL_ERROR;
 164                 }
 165                 addr.sa_socklen = sockaddr_ret;
 166                 ok = smb_krb5_sockaddr_to_kaddr(&addr.u.ss, &peer_krb5_addr);
 167                 if (!ok) {
 168                         DBG_WARNING("smb_krb5_sockaddr_to_kaddr (remote) failed\n");
 169                         talloc_free(gensec_krb5_state);
 170                         return NT_STATUS_INTERNAL_ERROR;
 171                 }
 172         }
 173
 174         ret = krb5_auth_con_setaddrs(gensec_krb5_state->smb_krb5_context->krb5_context,
 175                                      gensec_krb5_state->auth_context,
 176                                      tlocal_addr ? &my_krb5_addr : NULL,
 177                                      tremote_addr ? &peer_krb5_addr : NULL);
 178         if (ret) {
 179                 DEBUG(1,("gensec_krb5_start: krb5_auth_con_setaddrs failed (%s)\n",
 180                          smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 181                                                     ret, gensec_krb5_state)));
 182                 talloc_free(gensec_krb5_state);
 183                 return NT_STATUS_INTERNAL_ERROR;
 184         }
 185
 186         return NT_STATUS_OK;
 187 }
 188
 189 static NTSTATUS gensec_krb5_common_server_start(struct gensec_security *gensec_security, bool gssapi)
 190 {
 191         NTSTATUS nt_status;
 192         struct gensec_krb5_state *gensec_krb5_state;
 193
 194         nt_status = gensec_krb5_start(gensec_security, gssapi);
 195         if (!NT_STATUS_IS_OK(nt_status)) {
 196                 return nt_status;
 197         }
 198
 199         gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
 200         gensec_krb5_state->state_position = GENSEC_KRB5_SERVER_START;
 201
 202         return NT_STATUS_OK;
 203 }
 204
 205 static NTSTATUS gensec_krb5_server_start(struct gensec_security *gensec_security)
 206 {
 207         return gensec_krb5_common_server_start(gensec_security, false);
 208 }
 209
 210 static NTSTATUS gensec_fake_gssapi_krb5_server_start(struct gensec_security *gensec_security)
 211 {
 212         return gensec_krb5_common_server_start(gensec_security, true);
 213 }
 214
 215 static NTSTATUS gensec_krb5_common_client_start(struct gensec_security *gensec_security, bool gssapi)
 216 {
 217         const char *hostname;
 218         struct gensec_krb5_state *gensec_krb5_state;
 219         NTSTATUS nt_status;
 220         hostname = gensec_get_target_hostname(gensec_security);
 221         if (!hostname) {
 222                 DEBUG(3, ("No hostname for target computer passed in, cannot use kerberos for this connection\n"));
 223                 return NT_STATUS_INVALID_PARAMETER;
 224         }
 225         if (is_ipaddress(hostname)) {
 226                 DEBUG(2, ("Cannot do krb5 to an IP address"));
 227                 return NT_STATUS_INVALID_PARAMETER;
 228         }
 229         if (strcmp(hostname, "localhost") == 0) {
 230                 DEBUG(2, ("krb5 to 'localhost' does not make sense"));
 231                 return NT_STATUS_INVALID_PARAMETER;
 232         }
 233
 234         nt_status = gensec_krb5_start(gensec_security, gssapi);
 235         if (!NT_STATUS_IS_OK(nt_status)) {
 236                 return nt_status;
 237         }
 238
 239         gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
 240         gensec_krb5_state->state_position = GENSEC_KRB5_CLIENT_START;
 241         gensec_krb5_state->ap_req_options = AP_OPTS_USE_SUBKEY;
 242
 243         if (gensec_krb5_state->gssapi) {
 244                 /* The Fake GSSAPI model emulates Samba3, which does not do mutual authentication */
 245                 if (gensec_setting_bool(gensec_security->settings, "gensec_fake_gssapi_krb5", "mutual", false)) {
 246                         gensec_krb5_state->ap_req_options |= AP_OPTS_MUTUAL_REQUIRED;
 247                 }
 248         } else {
 249                 /* The wrapping for KPASSWD (a user of the raw KRB5 API) should be mutually authenticated */
 250                 if (gensec_setting_bool(gensec_security->settings, "gensec_krb5", "mutual", true)) {
 251                         gensec_krb5_state->ap_req_options |= AP_OPTS_MUTUAL_REQUIRED;
 252                 }
 253         }
 254         return NT_STATUS_OK;
 255 }
 256
 257 static NTSTATUS gensec_krb5_common_client_creds(struct gensec_security *gensec_security,
 258                                                 struct tevent_context *ev)
 259 {
 260         struct gensec_krb5_state *gensec_krb5_state;
 261         krb5_error_code ret;
 262         struct ccache_container *ccache_container;
 263         const char *error_string;
 264         const char *principal;
 265         const char *hostname;
 266         krb5_data in_data = { .length = 0 };
 267         krb5_data *in_data_p = NULL;
 268 #ifdef SAMBA4_USES_HEIMDAL
 269         struct tevent_context *previous_ev;
 270 #endif
 271
 272         if (lpcfg_parm_bool(gensec_security->settings->lp_ctx,
 273                             NULL, "gensec_krb5", "send_authenticator_checksum", true)) {
 274                 in_data_p = &in_data;
 275         }
 276
 277         gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
 278
 279         principal = gensec_get_target_principal(gensec_security);
 280         hostname = gensec_get_target_hostname(gensec_security);
 281
 282         ret = cli_credentials_get_ccache(gensec_get_credentials(gensec_security),
 283                                          ev,
 284                                          gensec_security->settings->lp_ctx, &ccache_container, &error_string);
 285         switch (ret) {
 286         case 0:
 287                 break;
 288         case KRB5KDC_ERR_PREAUTH_FAILED:
 289         case KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN:
 290                 return NT_STATUS_LOGON_FAILURE;
 291         case KRB5_KDC_UNREACH:
 292                 DEBUG(3, ("Cannot reach a KDC we require to contact %s: %s\n", principal, error_string));
 293                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 294         case KRB5_CC_NOTFOUND:
 295         case KRB5_CC_END:
 296                 DEBUG(3, ("Error preparing credentials we require to contact %s : %s\n", principal, error_string));
 297                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 298         default:
 299                 DEBUG(1, ("gensec_krb5_start: Aquiring initiator credentials failed: %s\n", error_string));
 300                 return NT_STATUS_UNSUCCESSFUL;
 301         }
 302
 303 #ifdef SAMBA4_USES_HEIMDAL
 304         /* Do this every time, in case we have weird recursive issues here */
 305         ret = smb_krb5_context_set_event_ctx(gensec_krb5_state->smb_krb5_context, ev, &previous_ev);
 306         if (ret != 0) {
 307                 DEBUG(1, ("gensec_krb5_start: Setting event context failed\n"));
 308                 return NT_STATUS_NO_MEMORY;
 309         }
 310 #endif
 311         if (principal) {
 312                 krb5_principal target_principal;
 313                 ret = krb5_parse_name(gensec_krb5_state->smb_krb5_context->krb5_context, principal,
 314                                       &target_principal);
 315                 if (ret == 0) {
 316                         krb5_creds this_cred;
 317                         krb5_creds *cred;
 318
 319                         ZERO_STRUCT(this_cred);
 320                         ret = krb5_cc_get_principal(gensec_krb5_state->smb_krb5_context->krb5_context,
 321                                                     ccache_container->ccache,
 322                                                     &this_cred.client);
 323                         if (ret != 0) {
 324                                 krb5_free_principal(gensec_krb5_state->smb_krb5_context->krb5_context,
 325                                                     target_principal);
 326                                 return NT_STATUS_UNSUCCESSFUL;
 327                         }
 328
 329                         ret = krb5_copy_principal(gensec_krb5_state->smb_krb5_context->krb5_context,
 330                                                   target_principal,
 331                                                   &this_cred.server);
 332                         krb5_free_principal(gensec_krb5_state->smb_krb5_context->krb5_context,
 333                                             target_principal);
 334                         if (ret != 0) {
 335                                 krb5_free_cred_contents(gensec_krb5_state->smb_krb5_context->krb5_context,
 336                                                         &this_cred);
 337                                 return NT_STATUS_UNSUCCESSFUL;
 338                         }
 339                         this_cred.times.endtime = 0;
 340
 341                         ret = krb5_get_credentials(gensec_krb5_state->smb_krb5_context->krb5_context,
 342                                                    0,
 343                                                    ccache_container->ccache,
 344                                                    &this_cred,
 345                                                    &cred);
 346                         krb5_free_cred_contents(gensec_krb5_state->smb_krb5_context->krb5_context,
 347                                                 &this_cred);
 348                         if (ret != 0) {
 349                                 return NT_STATUS_UNSUCCESSFUL;
 350                         }
 351
 352                         ret = krb5_mk_req_extended(gensec_krb5_state->smb_krb5_context->krb5_context,
 353                                                    &gensec_krb5_state->auth_context,
 354                                                    gensec_krb5_state->ap_req_options,
 355                                                    in_data_p,
 356                                                    cred,
 357                                                    &gensec_krb5_state->enc_ticket);
 358                 }
 359         } else {
 360                 ret = krb5_mk_req(gensec_krb5_state->smb_krb5_context->krb5_context,
 361                                   &gensec_krb5_state->auth_context,
 362                                   gensec_krb5_state->ap_req_options,
 363                                   discard_const_p(char, gensec_get_target_service(gensec_security)),
 364                                   discard_const_p(char, hostname),
 365                                   in_data_p, ccache_container->ccache,
 366                                   &gensec_krb5_state->enc_ticket);
 367         }
 368
 369 #ifdef SAMBA4_USES_HEIMDAL
 370         smb_krb5_context_remove_event_ctx(gensec_krb5_state->smb_krb5_context, previous_ev, ev);
 371 #endif
 372
 373         switch (ret) {
 374         case 0:
 375                 return NT_STATUS_OK;
 376         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 377                 DEBUG(3, ("Server [%s] is not registered with our KDC: %s\n",
 378                           hostname, smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 379                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 380         case KRB5_KDC_UNREACH:
 381                 DEBUG(3, ("Cannot reach a KDC we require to contact host [%s]: %s\n",
 382                           hostname, smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 383                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 384         case KRB5KDC_ERR_PREAUTH_FAILED:
 385         case KRB5KRB_AP_ERR_TKT_EXPIRED:
 386         case KRB5_CC_END:
 387                 /* Too much clock skew - we will need to kinit to re-skew the clock */
 388         case KRB5KRB_AP_ERR_SKEW:
 389         case KRB5_KDCREP_SKEW:
 390                 DEBUG(3, ("kerberos (mk_req) failed: %s\n",
 391                           smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 392                 FALL_THROUGH;
 393         /* just don't print a message for these really ordinary messages */
 394         case KRB5_FCC_NOFILE:
 395         case KRB5_CC_NOTFOUND:
 396         case ENOENT:
 397
 398                 return NT_STATUS_UNSUCCESSFUL;
 399                 break;
 400
 401         default:
 402                 DEBUG(0, ("kerberos: %s\n",
 403                           smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 404                 return NT_STATUS_UNSUCCESSFUL;
 405         }
 406 }
 407
 408 static NTSTATUS gensec_krb5_client_start(struct gensec_security *gensec_security)
 409 {
 410         return gensec_krb5_common_client_start(gensec_security, false);
 411 }
 412
 413 static NTSTATUS gensec_fake_gssapi_krb5_client_start(struct gensec_security *gensec_security)
 414 {
 415         return gensec_krb5_common_client_start(gensec_security, true);
 416 }
 417
 418
 419 /*
 420   generate a krb5 GSS-API wrapper packet given a ticket
 421 */
 422 static DATA_BLOB gensec_gssapi_gen_krb5_wrap(TALLOC_CTX *mem_ctx, const DATA_BLOB *ticket, const uint8_t tok_id[2])
 423 {
 424         struct asn1_data *data;
 425         DATA_BLOB ret = data_blob_null;
 426
 427         data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
 428         if (!data || !ticket->data) {
 429                 return ret;
 430         }
 431
 432         if (!asn1_push_tag(data, ASN1_APPLICATION(0))) goto err;
 433         if (!asn1_write_OID(data, GENSEC_OID_KERBEROS5)) goto err;
 434
 435         if (!asn1_write(data, tok_id, 2)) goto err;
 436         if (!asn1_write(data, ticket->data, ticket->length)) goto err;
 437         if (!asn1_pop_tag(data)) goto err;
 438
 439
 440         if (!asn1_extract_blob(data, mem_ctx, &ret)) {
 441                 goto err;
 442         }
 443         asn1_free(data);
 444
 445         return ret;
 446
 447   err:
 448
 449         DEBUG(1, ("Failed to build krb5 wrapper at offset %d\n",
 450                   (int)asn1_current_ofs(data)));
 451         asn1_free(data);
 452         return ret;
 453 }
 454
 455 /*
 456   parse a krb5 GSS-API wrapper packet giving a ticket
 457 */
 458 static bool gensec_gssapi_parse_krb5_wrap(TALLOC_CTX *mem_ctx, const DATA_BLOB *blob, DATA_BLOB *ticket, uint8_t tok_id[2])
 459 {
 460         bool ret = false;
 461         struct asn1_data *data = asn1_init(mem_ctx, ASN1_MAX_TREE_DEPTH);
 462         int data_remaining;
 463
 464         if (!data) {
 465                 return false;
 466         }
 467
 468         if (!asn1_load(data, *blob)) goto err;
 469         if (!asn1_start_tag(data, ASN1_APPLICATION(0))) goto err;
 470         if (!asn1_check_OID(data, GENSEC_OID_KERBEROS5)) goto err;
 471
 472         data_remaining = asn1_tag_remaining(data);
 473
 474         if (data_remaining < 3) {
 475                 asn1_set_error(data);
 476         } else {
 477                 if (!asn1_read(data, tok_id, 2)) goto err;
 478                 data_remaining -= 2;
 479                 *ticket = data_blob_talloc(mem_ctx, NULL, data_remaining);
 480                 if (!asn1_read(data, ticket->data, ticket->length)) goto err;
 481         }
 482
 483         if (!asn1_end_tag(data)) goto err;
 484
 485         ret = !asn1_has_error(data);
 486
 487   err:
 488
 489         asn1_free(data);
 490
 491         return ret;
 492 }
 493
 494 static NTSTATUS gensec_krb5_update_internal(struct gensec_security *gensec_security,
 495                                             TALLOC_CTX *out_mem_ctx,
 496                                             struct tevent_context *ev,
 497                                             const DATA_BLOB in, DATA_BLOB *out)
 498 {
 499         struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
 500         krb5_error_code ret = 0;
 501         NTSTATUS nt_status;
 502
 503         switch (gensec_krb5_state->state_position) {
 504         case GENSEC_KRB5_CLIENT_START:
 505         {
 506                 DATA_BLOB unwrapped_out;
 507
 508                 nt_status = gensec_krb5_common_client_creds(gensec_security, ev);
 509                 if (!NT_STATUS_IS_OK(nt_status)) {
 510                         return nt_status;
 511                 }
 512
 513                 if (gensec_krb5_state->gssapi) {
 514                         unwrapped_out = data_blob_talloc(out_mem_ctx, gensec_krb5_state->enc_ticket.data, gensec_krb5_state->enc_ticket.length);
 515
 516                         /* wrap that up in a nice GSS-API wrapping */
 517                         *out = gensec_gssapi_gen_krb5_wrap(out_mem_ctx, &unwrapped_out, TOK_ID_KRB_AP_REQ);
 518                 } else {
 519                         *out = data_blob_talloc(out_mem_ctx, gensec_krb5_state->enc_ticket.data, gensec_krb5_state->enc_ticket.length);
 520                 }
 521                 if (gensec_krb5_state->ap_req_options & AP_OPTS_MUTUAL_REQUIRED) {
 522                         gensec_krb5_state->state_position = GENSEC_KRB5_CLIENT_MUTUAL_AUTH;
 523                         nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 524                 } else {
 525                         gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
 526                         nt_status = NT_STATUS_OK;
 527                 }
 528                 return nt_status;
 529         }
 530
 531         case GENSEC_KRB5_CLIENT_MUTUAL_AUTH:
 532         {
 533                 DATA_BLOB unwrapped_in;
 534                 krb5_data inbuf;
 535                 krb5_ap_rep_enc_part *repl = NULL;
 536                 uint8_t tok_id[2];
 537
 538                 if (gensec_krb5_state->gssapi) {
 539                         if (!gensec_gssapi_parse_krb5_wrap(out_mem_ctx, &in, &unwrapped_in, tok_id)) {
 540                                 DEBUG(1,("gensec_gssapi_parse_krb5_wrap(mutual authentication) failed to parse\n"));
 541                                 dump_data_pw("Mutual authentication message:\n", in.data, in.length);
 542                                 return NT_STATUS_INVALID_PARAMETER;
 543                         }
 544                 } else {
 545                         unwrapped_in = in;
 546                 }
 547                 /* TODO: check the tok_id */
 548
 549                 inbuf.data = (char *)unwrapped_in.data;
 550                 inbuf.length = unwrapped_in.length;
 551                 ret = krb5_rd_rep(gensec_krb5_state->smb_krb5_context->krb5_context,
 552                                   gensec_krb5_state->auth_context,
 553                                   &inbuf, &repl);
 554                 if (ret) {
 555                         DEBUG(1,("krb5_rd_rep (mutual authentication) failed (%s)\n",
 556                                  smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, out_mem_ctx)));
 557                         dump_data_pw("Mutual authentication message:\n", (uint8_t *)inbuf.data, inbuf.length);
 558                         nt_status = NT_STATUS_ACCESS_DENIED;
 559                 } else {
 560                         *out = data_blob(NULL, 0);
 561                         nt_status = NT_STATUS_OK;
 562                         gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
 563                 }
 564                 if (repl) {
 565                         krb5_free_ap_rep_enc_part(gensec_krb5_state->smb_krb5_context->krb5_context, repl);
 566                 }
 567                 return nt_status;
 568         }
 569
 570         case GENSEC_KRB5_SERVER_START:
 571         {
 572                 DATA_BLOB unwrapped_in;
 573                 DATA_BLOB unwrapped_out = data_blob(NULL, 0);
 574                 krb5_data inbuf, outbuf;
 575                 uint8_t tok_id[2];
 576                 struct keytab_container *keytab;
 577                 krb5_principal server_in_keytab;
 578                 const char *error_string;
 579                 enum credentials_obtained obtained;
 580
 581                 if (!in.data) {
 582                         return NT_STATUS_INVALID_PARAMETER;
 583                 }
 584
 585                 /* Grab the keytab, however generated */
 586                 ret = cli_credentials_get_keytab(gensec_get_credentials(gensec_security),
 587                                                  gensec_security->settings->lp_ctx, &keytab);
 588                 if (ret) {
 589                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 590                 }
 591
 592                 /* This ensures we lookup the correct entry in that
 593                  * keytab.  A NULL principal is acceptable, and means
 594                  * that the krb5 libs should search the keytab at
 595                  * accept time for any matching key */
 596                 ret = principal_from_credentials(out_mem_ctx, gensec_get_credentials(gensec_security),
 597                                                  gensec_krb5_state->smb_krb5_context,
 598                                                  &server_in_keytab, &obtained, &error_string);
 599
 600                 if (ret) {
 601                         DEBUG(2,("Failed to make credentials from principal: %s\n", error_string));
 602                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 603                 }
 604
 605                 if (keytab->password_based || obtained < CRED_SPECIFIED) {
 606                         /*
 607                          * Use match-by-key in this case (matches
 608                          * cli_credentials_get_server_gss_creds()
 609                          * behaviour).  No need to free the memory,
 610                          * this is handled with a talloc destructor.
 611                          */
 612                         server_in_keytab = NULL;
 613                 }
 614
 615                 /* Parse the GSSAPI wrapping, if it's there... (win2k3 allows it to be omited) */
 616                 if (gensec_krb5_state->gssapi
 617                     && gensec_gssapi_parse_krb5_wrap(out_mem_ctx, &in, &unwrapped_in, tok_id)) {
 618                         inbuf.data = (char *)unwrapped_in.data;
 619                         inbuf.length = unwrapped_in.length;
 620                 } else {
 621                         inbuf.data = (char *)in.data;
 622                         inbuf.length = in.length;
 623                 }
 624
 625                 ret = smb_krb5_rd_req_decoded(gensec_krb5_state->smb_krb5_context->krb5_context,
 626                                               &gensec_krb5_state->auth_context,
 627                                               &inbuf,
 628                                               keytab->keytab,
 629                                               server_in_keytab,
 630                                               &outbuf,
 631                                               &gensec_krb5_state->ticket,
 632                                               &gensec_krb5_state->keyblock);
 633
 634                 if (ret) {
 635                         DBG_WARNING("smb_krb5_rd_req_decoded failed\n");
 636                         return NT_STATUS_LOGON_FAILURE;
 637                 }
 638                 unwrapped_out.data = (uint8_t *)outbuf.data;
 639                 unwrapped_out.length = outbuf.length;
 640                 gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
 641                 /* wrap that up in a nice GSS-API wrapping */
 642                 if (gensec_krb5_state->gssapi) {
 643                         *out = gensec_gssapi_gen_krb5_wrap(out_mem_ctx, &unwrapped_out, TOK_ID_KRB_AP_REP);
 644                 } else {
 645                         *out = data_blob_talloc(out_mem_ctx, outbuf.data, outbuf.length);
 646                 }
 647                 smb_krb5_free_data_contents(gensec_krb5_state->smb_krb5_context->krb5_context,
 648                                             &outbuf);
 649                 return NT_STATUS_OK;
 650         }
 651
 652         case GENSEC_KRB5_DONE:
 653         default:
 654                 /* Asking too many times... */
 655                 return NT_STATUS_INVALID_PARAMETER;
 656         }
 657 }
 658
 659 struct gensec_krb5_update_state {
 660         NTSTATUS status;
 661         DATA_BLOB out;
 662 };
 663
 664 static struct tevent_req *gensec_krb5_update_send(TALLOC_CTX *mem_ctx,
 665                                                   struct tevent_context *ev,
 666                                                   struct gensec_security *gensec_security,
 667                                                   const DATA_BLOB in)
 668 {
 669         struct tevent_req *req = NULL;
 670         struct gensec_krb5_update_state *state = NULL;
 671         NTSTATUS status;
 672
 673         req = tevent_req_create(mem_ctx, &state,
 674                                 struct gensec_krb5_update_state);
 675         if (req == NULL) {
 676                 return NULL;
 677         }
 678
 679         status = gensec_krb5_update_internal(gensec_security,
 680                                              state, ev, in,
 681                                              &state->out);
 682         state->status = status;
 683         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 684                 tevent_req_done(req);
 685                 return tevent_req_post(req, ev);
 686         }
 687         if (tevent_req_nterror(req, status)) {
 688                 return tevent_req_post(req, ev);
 689         }
 690
 691         tevent_req_done(req);
 692         return tevent_req_post(req, ev);
 693 }
 694
 695 static NTSTATUS gensec_krb5_update_recv(struct tevent_req *req,
 696                                         TALLOC_CTX *out_mem_ctx,
 697                                         DATA_BLOB *out)
 698 {
 699         struct gensec_krb5_update_state *state =
 700                 tevent_req_data(req,
 701                 struct gensec_krb5_update_state);
 702         NTSTATUS status;
 703
 704         *out = data_blob_null;
 705
 706         if (tevent_req_is_nterror(req, &status)) {
 707                 tevent_req_received(req);
 708                 return status;
 709         }
 710
 711         *out = state->out;
 712         talloc_steal(out_mem_ctx, state->out.data);
 713         status = state->status;
 714         tevent_req_received(req);
 715         return status;
 716 }
 717
 718 static NTSTATUS gensec_krb5_session_key(struct gensec_security *gensec_security,
 719                                         TALLOC_CTX *mem_ctx,
 720                                         DATA_BLOB *session_key)
 721 {
 722         struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
 723         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
 724         krb5_auth_context auth_context = gensec_krb5_state->auth_context;
 725         krb5_error_code err = -1;
 726         bool remote = false;
 727         bool ok;
 728
 729         if (gensec_krb5_state->state_position != GENSEC_KRB5_DONE) {
 730                 return NT_STATUS_NO_USER_SESSION_KEY;
 731         }
 732
 733         switch (gensec_security->gensec_role) {
 734         case GENSEC_CLIENT:
 735                 remote = false;
 736                 break;
 737         case GENSEC_SERVER:
 738                 remote = true;
 739                 break;
 740         }
 741
 742         ok = smb_krb5_get_smb_session_key(mem_ctx,
 743                                           context,
 744                                           auth_context,
 745                                           session_key,
 746                                           remote);
 747         if (!ok) {
 748                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 749                 return NT_STATUS_NO_USER_SESSION_KEY;
 750         }
 751
 752         return NT_STATUS_OK;
 753 }
 754
 755 #ifdef SAMBA4_USES_HEIMDAL
 756 static NTSTATUS gensec_krb5_session_info(struct gensec_security *gensec_security,
 757                                          TALLOC_CTX *mem_ctx,
 758                                          struct auth_session_info **_session_info)
 759 {
 760         NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
 761         struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
 762         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
 763         struct auth_session_info *session_info = NULL;
 764
 765         krb5_principal client_principal;
 766         char *principal_string = NULL;
 767
 768         DATA_BLOB pac_blob, *pac_blob_ptr = NULL;
 769         krb5_data pac_data;
 770
 771         krb5_error_code ret;
 772
 773         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 774         if (!tmp_ctx) {
 775                 return NT_STATUS_NO_MEMORY;
 776         }
 777
 778         ret = krb5_ticket_get_client(context, gensec_krb5_state->ticket, &client_principal);
 779         if (ret) {
 780                 DEBUG(5, ("krb5_ticket_get_client failed to get client principal: %s\n",
 781                           smb_get_krb5_error_message(context,
 782                                                      ret, tmp_ctx)));
 783                 talloc_free(tmp_ctx);
 784                 return NT_STATUS_NO_MEMORY;
 785         }
 786
 787         ret = krb5_unparse_name(gensec_krb5_state->smb_krb5_context->krb5_context,
 788                                 client_principal, &principal_string);
 789         if (ret) {
 790                 DEBUG(1, ("Unable to parse client principal: %s\n",
 791                           smb_get_krb5_error_message(context,
 792                                                      ret, tmp_ctx)));
 793                 krb5_free_principal(context, client_principal);
 794                 talloc_free(tmp_ctx);
 795                 return NT_STATUS_NO_MEMORY;
 796         }
 797
 798         ret = krb5_ticket_get_authorization_data_type(context, gensec_krb5_state->ticket,
 799                                                       KRB5_AUTHDATA_WIN2K_PAC,
 800                                                       &pac_data);
 801
 802         if (ret) {
 803                 /* NO pac */
 804                 DEBUG(5, ("krb5_ticket_get_authorization_data_type failed to find PAC: %s\n",
 805                           smb_get_krb5_error_message(context,
 806                                                      ret, tmp_ctx)));
 807         } else {
 808                 /* Found pac */
 809                 pac_blob = data_blob_talloc(tmp_ctx, pac_data.data, pac_data.length);
 810                 smb_krb5_free_data_contents(context, &pac_data);
 811                 if (!pac_blob.data) {
 812                         free(principal_string);
 813                         krb5_free_principal(context, client_principal);
 814                         talloc_free(tmp_ctx);
 815                         return NT_STATUS_NO_MEMORY;
 816                 }
 817
 818                 /* decode and verify the pac */
 819                 nt_status = kerberos_decode_pac(gensec_krb5_state,
 820                                                 pac_blob,
 821                                                 gensec_krb5_state->smb_krb5_context->krb5_context,
 822                                                 NULL, gensec_krb5_state->keyblock,
 823                                                 client_principal,
 824                                                 gensec_krb5_state->ticket->ticket.authtime, NULL);
 825
 826                 if (!NT_STATUS_IS_OK(nt_status)) {
 827                         free(principal_string);
 828                         krb5_free_principal(context, client_principal);
 829                         talloc_free(tmp_ctx);
 830                         return nt_status;
 831                 }
 832
 833                 pac_blob_ptr = &pac_blob;
 834         }
 835
 836         nt_status = gensec_generate_session_info_pac(tmp_ctx,
 837                                                      gensec_security,
 838                                                      gensec_krb5_state->smb_krb5_context,
 839                                                      pac_blob_ptr, principal_string,
 840                                                      gensec_get_remote_address(gensec_security),
 841                                                      &session_info);
 842
 843         free(principal_string);
 844         krb5_free_principal(context, client_principal);
 845
 846         if (!NT_STATUS_IS_OK(nt_status)) {
 847                 talloc_free(tmp_ctx);
 848                 return nt_status;
 849         }
 850
 851         nt_status = gensec_krb5_session_key(gensec_security, session_info, &session_info->session_key);
 852
 853         if (!NT_STATUS_IS_OK(nt_status)) {
 854                 talloc_free(tmp_ctx);
 855                 return nt_status;
 856         }
 857
 858         *_session_info = talloc_steal(mem_ctx, session_info);
 859
 860         talloc_free(tmp_ctx);
 861         return NT_STATUS_OK;
 862 }
 863 #else /* MIT KERBEROS */
 864 static NTSTATUS gensec_krb5_session_info(struct gensec_security *gensec_security,
 865                                          TALLOC_CTX *mem_ctx,
 866                                          struct auth_session_info **psession_info)
 867 {
 868         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
 869         struct gensec_krb5_state *gensec_krb5_state =
 870                 (struct gensec_krb5_state *)gensec_security->private_data;
 871         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
 872         struct auth_session_info *session_info = NULL;
 873
 874         krb5_principal client_principal;
 875         char *principal_string = NULL;
 876
 877         krb5_authdata **auth_pac_data = NULL;
 878         DATA_BLOB pac_blob, *pac_blob_ptr = NULL;
 879
 880         krb5_error_code code;
 881
 882         TALLOC_CTX *tmp_ctx;
 883
 884         tmp_ctx = talloc_new(mem_ctx);
 885         if (tmp_ctx == NULL) {
 886                 return NT_STATUS_NO_MEMORY;
 887         }
 888
 889         code = krb5_copy_principal(context,
 890                                    gensec_krb5_state->ticket->enc_part2->client,
 891                                    &client_principal);
 892         if (code != 0) {
 893                 DBG_INFO("krb5_copy_principal failed to copy client "
 894                          "principal: %s\n",
 895                          smb_get_krb5_error_message(context, code, tmp_ctx));
 896                 talloc_free(tmp_ctx);
 897                 return NT_STATUS_NO_MEMORY;
 898         }
 899
 900         code = krb5_unparse_name(context, client_principal, &principal_string);
 901         if (code != 0) {
 902                 DBG_WARNING("Unable to parse client principal: %s\n",
 903                             smb_get_krb5_error_message(context, code, tmp_ctx));
 904                 krb5_free_principal(context, client_principal);
 905                 talloc_free(tmp_ctx);
 906                 return NT_STATUS_NO_MEMORY;
 907         }
 908
 909         code = krb5_find_authdata(context,
 910                                   gensec_krb5_state->ticket->enc_part2->authorization_data,
 911                                   NULL,
 912                                   KRB5_AUTHDATA_WIN2K_PAC,
 913                                   &auth_pac_data);
 914         if (code != 0) {
 915                 /* NO pac */
 916                 DBG_INFO("krb5_find_authdata failed to find PAC: %s\n",
 917                          smb_get_krb5_error_message(context, code, tmp_ctx));
 918         } else {
 919                 krb5_timestamp ticket_authtime =
 920                         gensec_krb5_state->ticket->enc_part2->times.authtime;
 921
 922                 /* Found pac */
 923                 pac_blob = data_blob_talloc(tmp_ctx,
 924                                             auth_pac_data[0]->contents,
 925                                             auth_pac_data[0]->length);
 926                 krb5_free_authdata(context, auth_pac_data);
 927                 if (pac_blob.data == NULL) {
 928                         free(principal_string);
 929                         krb5_free_principal(context, client_principal);
 930                         talloc_free(tmp_ctx);
 931                         return NT_STATUS_NO_MEMORY;
 932                 }
 933
 934                 /* decode and verify the pac */
 935                 status = kerberos_decode_pac(gensec_krb5_state,
 936                                              pac_blob,
 937                                              context,
 938                                              NULL,
 939                                              gensec_krb5_state->keyblock,
 940                                              client_principal,
 941                                              ticket_authtime,
 942                                              NULL);
 943
 944                 if (!NT_STATUS_IS_OK(status)) {
 945                         free(principal_string);
 946                         krb5_free_principal(context, client_principal);
 947                         talloc_free(tmp_ctx);
 948                         return status;
 949                 }
 950
 951                 pac_blob_ptr = &pac_blob;
 952         }
 953         krb5_free_principal(context, client_principal);
 954
 955         status = gensec_generate_session_info_pac(tmp_ctx,
 956                                                   gensec_security,
 957                                                   gensec_krb5_state->smb_krb5_context,
 958                                                   pac_blob_ptr,
 959                                                   principal_string,
 960                                                   gensec_get_remote_address(gensec_security),
 961                                                   &session_info);
 962         SAFE_FREE(principal_string);
 963         if (!NT_STATUS_IS_OK(status)) {
 964                 talloc_free(tmp_ctx);
 965                 return status;
 966         }
 967
 968         status = gensec_krb5_session_key(gensec_security,
 969                                          session_info,
 970                                          &session_info->session_key);
 971         if (!NT_STATUS_IS_OK(status)) {
 972                 talloc_free(tmp_ctx);
 973                 return status;
 974         }
 975
 976         *psession_info = talloc_steal(mem_ctx, session_info);
 977         talloc_free(tmp_ctx);
 978
 979         return NT_STATUS_OK;
 980 }
 981 #endif /* SAMBA4_USES_HEIMDAL */
 982
 983 static NTSTATUS gensec_krb5_wrap(struct gensec_security *gensec_security,
 984                                    TALLOC_CTX *mem_ctx,
 985                                    const DATA_BLOB *in,
 986                                    DATA_BLOB *out)
 987 {
 988         struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
 989         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
 990         krb5_auth_context auth_context = gensec_krb5_state->auth_context;
 991         krb5_error_code ret;
 992         krb5_data input, output;
 993         input.length = in->length;
 994         input.data = (char *)in->data;
 995
 996         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 997                 ret = krb5_mk_priv(context, auth_context, &input, &output, NULL);
 998                 if (ret) {
 999                         DEBUG(1, ("krb5_mk_priv failed: %s\n",
1000                                   smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
1001                                                              ret, mem_ctx)));
1002                         return NT_STATUS_ACCESS_DENIED;
1003                 }
1004                 *out = data_blob_talloc(mem_ctx, output.data, output.length);
1005
1006                 smb_krb5_free_data_contents(context, &output);
1007         } else {
1008                 return NT_STATUS_ACCESS_DENIED;
1009         }
1010         return NT_STATUS_OK;
1011 }
1012
1013 static NTSTATUS gensec_krb5_unwrap(struct gensec_security *gensec_security,
1014                                      TALLOC_CTX *mem_ctx,
1015                                      const DATA_BLOB *in,
1016                                      DATA_BLOB *out)
1017 {
1018         struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
1019         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
1020         krb5_auth_context auth_context = gensec_krb5_state->auth_context;
1021         krb5_error_code ret;
1022         krb5_data input, output;
1023         krb5_replay_data replay;
1024         input.length = in->length;
1025         input.data = (char *)in->data;
1026
1027         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
1028                 ret = krb5_rd_priv(context, auth_context, &input, &output, &replay);
1029                 if (ret) {
1030                         DEBUG(1, ("krb5_rd_priv failed: %s\n",
1031                                   smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
1032                                                              ret, mem_ctx)));
1033                         return NT_STATUS_ACCESS_DENIED;
1034                 }
1035                 *out = data_blob_talloc(mem_ctx, output.data, output.length);
1036
1037                 smb_krb5_free_data_contents(context, &output);
1038         } else {
1039                 return NT_STATUS_ACCESS_DENIED;
1040         }
1041         return NT_STATUS_OK;
1042 }
1043
1044 static bool gensec_krb5_have_feature(struct gensec_security *gensec_security,
1045                                      uint32_t feature)
1046 {
1047         struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
1048         if (feature & GENSEC_FEATURE_SESSION_KEY) {
1049                 return true;
1050         }
1051         if (gensec_krb5_state->gssapi) {
1052                 return false;
1053         }
1054
1055         /*
1056          * krb5_mk_priv provides SIGN and SEAL
1057          */
1058         if (feature & GENSEC_FEATURE_SIGN) {
1059                 return true;
1060         }
1061         if (feature & GENSEC_FEATURE_SEAL) {
1062                 return true;
1063         }
1064
1065         return false;
1066 }
1067
1068 static const char *gensec_krb5_final_auth_type(struct gensec_security *gensec_security)
1069 {
1070         return GENSEC_FINAL_AUTH_TYPE_KRB5;
1071 }
1072
1073 static const char *gensec_krb5_oids[] = {
1074         GENSEC_OID_KERBEROS5,
1075         GENSEC_OID_KERBEROS5_OLD,
1076         NULL
1077 };
1078
1079 static const struct gensec_security_ops gensec_fake_gssapi_krb5_security_ops = {
1080         .name           = "fake_gssapi_krb5",
1081         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
1082         .oid            = gensec_krb5_oids,
1083         .client_start   = gensec_fake_gssapi_krb5_client_start,
1084         .server_start   = gensec_fake_gssapi_krb5_server_start,
1085         .update_send    = gensec_krb5_update_send,
1086         .update_recv    = gensec_krb5_update_recv,
1087         .magic          = gensec_magic_check_krb5_oid,
1088         .session_key    = gensec_krb5_session_key,
1089         .session_info   = gensec_krb5_session_info,
1090         .have_feature   = gensec_krb5_have_feature,
1091         .final_auth_type = gensec_krb5_final_auth_type,
1092         .enabled        = false,
1093         .kerberos       = true,
1094         .priority       = GENSEC_KRB5,
1095 };
1096
1097 static const struct gensec_security_ops gensec_krb5_security_ops = {
1098         .name           = "krb5",
1099         .client_start   = gensec_krb5_client_start,
1100         .server_start   = gensec_krb5_server_start,
1101         .update_send    = gensec_krb5_update_send,
1102         .update_recv    = gensec_krb5_update_recv,
1103         .session_key    = gensec_krb5_session_key,
1104         .session_info   = gensec_krb5_session_info,
1105         .have_feature   = gensec_krb5_have_feature,
1106         .wrap           = gensec_krb5_wrap,
1107         .unwrap         = gensec_krb5_unwrap,
1108         .final_auth_type = gensec_krb5_final_auth_type,
1109         .enabled        = true,
1110         .kerberos       = true,
1111         .priority       = GENSEC_KRB5
1112 };
1113
1114 _PUBLIC_ NTSTATUS gensec_krb5_init(TALLOC_CTX *ctx)
1115 {
1116         NTSTATUS ret;
1117
1118         ret = gensec_register(ctx, &gensec_krb5_security_ops);
1119         if (!NT_STATUS_IS_OK(ret)) {
1120                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1121                         gensec_krb5_security_ops.name));
1122                 return ret;
1123         }
1124
1125         ret = gensec_register(ctx, &gensec_fake_gssapi_krb5_security_ops);
1126         if (!NT_STATUS_IS_OK(ret)) {
1127                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1128                         gensec_fake_gssapi_krb5_security_ops.name));
1129                 return ret;
1130         }
1131
1132         return ret;
1133 }