source4/auth/gensec/gensec_gssapi.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Kerberos backend for GENSEC
   5
   6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
   7    Copyright (C) Stefan Metzmacher <metze@samba.org> 2004-2005
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "lib/events/events.h"
  26 #include "system/kerberos.h"
  27 #include "system/gssapi.h"
  28 #include "auth/kerberos/kerberos.h"
  29 #include "librpc/gen_ndr/krb5pac.h"
  30 #include "auth/auth.h"
  31 #include <ldb.h>
  32 #include "auth/auth_sam.h"
  33 #include "librpc/rpc/dcerpc.h"
  34 #include "auth/credentials/credentials.h"
  35 #include "auth/credentials/credentials_krb5.h"
  36 #include "auth/gensec/gensec.h"
  37 #include "auth/gensec/gensec_proto.h"
  38 #include "auth/gensec/gensec_toplevel_proto.h"
  39 #include "param/param.h"
  40 #include "auth/session_proto.h"
  41 #include "gensec_gssapi.h"
  42 #include "lib/util/util_net.h"
  43 #include "auth/kerberos/pac_utils.h"
  44
  45 _PUBLIC_ NTSTATUS gensec_gssapi_init(void);
  46
  47 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security);
  48 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security);
  49
  50 static int gensec_gssapi_destructor(struct gensec_gssapi_state *gensec_gssapi_state)
  51 {
  52         OM_uint32 maj_stat, min_stat;
  53
  54         if (gensec_gssapi_state->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
  55                 maj_stat = gss_release_cred(&min_stat,
  56                                             &gensec_gssapi_state->delegated_cred_handle);
  57         }
  58
  59         if (gensec_gssapi_state->gssapi_context != GSS_C_NO_CONTEXT) {
  60                 maj_stat = gss_delete_sec_context (&min_stat,
  61                                                    &gensec_gssapi_state->gssapi_context,
  62                                                    GSS_C_NO_BUFFER);
  63         }
  64
  65         if (gensec_gssapi_state->server_name != GSS_C_NO_NAME) {
  66                 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->server_name);
  67         }
  68         if (gensec_gssapi_state->client_name != GSS_C_NO_NAME) {
  69                 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->client_name);
  70         }
  71
  72         if (gensec_gssapi_state->lucid) {
  73                 gss_krb5_free_lucid_sec_context(&min_stat, gensec_gssapi_state->lucid);
  74         }
  75
  76         return 0;
  77 }
  78
  79 static NTSTATUS gensec_gssapi_init_lucid(struct gensec_gssapi_state *gensec_gssapi_state)
  80 {
  81         OM_uint32 maj_stat, min_stat;
  82
  83         if (gensec_gssapi_state->lucid) {
  84                 return NT_STATUS_OK;
  85         }
  86
  87         maj_stat = gss_krb5_export_lucid_sec_context(&min_stat,
  88                                                      &gensec_gssapi_state->gssapi_context,
  89                                                      1,
  90                                                      (void **)&gensec_gssapi_state->lucid);
  91         if (maj_stat != GSS_S_COMPLETE) {
  92                 DEBUG(0,("gensec_gssapi_init_lucid: %s\n",
  93                         gssapi_error_string(gensec_gssapi_state,
  94                                             maj_stat, min_stat,
  95                                             gensec_gssapi_state->gss_oid)));
  96                 return NT_STATUS_INTERNAL_ERROR;
  97         }
  98
  99         if (gensec_gssapi_state->lucid->version != 1) {
 100                 DEBUG(0,("gensec_gssapi_init_lucid: lucid version[%d] != 1\n",
 101                         gensec_gssapi_state->lucid->version));
 102                 gss_krb5_free_lucid_sec_context(&min_stat, gensec_gssapi_state->lucid);
 103                 gensec_gssapi_state->lucid = NULL;
 104                 return NT_STATUS_INTERNAL_ERROR;
 105         }
 106
 107         return NT_STATUS_OK;
 108 }
 109
 110 static NTSTATUS gensec_gssapi_start(struct gensec_security *gensec_security)
 111 {
 112         struct gensec_gssapi_state *gensec_gssapi_state;
 113         krb5_error_code ret;
 114         const char *realm;
 115
 116         gensec_gssapi_state = talloc_zero(gensec_security, struct gensec_gssapi_state);
 117         if (!gensec_gssapi_state) {
 118                 return NT_STATUS_NO_MEMORY;
 119         }
 120
 121         gensec_security->private_data = gensec_gssapi_state;
 122
 123         gensec_gssapi_state->gssapi_context = GSS_C_NO_CONTEXT;
 124
 125         /* TODO: Fill in channel bindings */
 126         gensec_gssapi_state->input_chan_bindings = GSS_C_NO_CHANNEL_BINDINGS;
 127
 128         gensec_gssapi_state->server_name = GSS_C_NO_NAME;
 129         gensec_gssapi_state->client_name = GSS_C_NO_NAME;
 130
 131         gensec_gssapi_state->gss_want_flags = 0;
 132         gensec_gssapi_state->expire_time = GENSEC_EXPIRE_TIME_INFINITY;
 133
 134         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation_by_kdc_policy", true)) {
 135                 gensec_gssapi_state->gss_want_flags |= GSS_C_DELEG_POLICY_FLAG;
 136         }
 137         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "mutual", true)) {
 138                 gensec_gssapi_state->gss_want_flags |= GSS_C_MUTUAL_FLAG;
 139         }
 140         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation", true)) {
 141                 gensec_gssapi_state->gss_want_flags |= GSS_C_DELEG_FLAG;
 142         }
 143         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "replay", true)) {
 144                 gensec_gssapi_state->gss_want_flags |= GSS_C_REPLAY_FLAG;
 145         }
 146         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "sequence", true)) {
 147                 gensec_gssapi_state->gss_want_flags |= GSS_C_SEQUENCE_FLAG;
 148         }
 149
 150         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 151                 gensec_gssapi_state->gss_want_flags |= GSS_C_INTEG_FLAG;
 152         }
 153         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 154                 gensec_gssapi_state->gss_want_flags |= GSS_C_INTEG_FLAG;
 155                 gensec_gssapi_state->gss_want_flags |= GSS_C_CONF_FLAG;
 156         }
 157         if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
 158                 gensec_gssapi_state->gss_want_flags |= GSS_C_DCE_STYLE;
 159         }
 160
 161         gensec_gssapi_state->gss_got_flags = 0;
 162
 163         switch (gensec_security->ops->auth_type) {
 164         case DCERPC_AUTH_TYPE_SPNEGO:
 165                 gensec_gssapi_state->gss_oid = gss_mech_spnego;
 166                 break;
 167         case DCERPC_AUTH_TYPE_KRB5:
 168         default:
 169                 gensec_gssapi_state->gss_oid = gss_mech_krb5;
 170                 break;
 171         }
 172
 173         ret = smb_krb5_init_context(gensec_gssapi_state,
 174                                     NULL,
 175                                     gensec_security->settings->lp_ctx,
 176                                     &gensec_gssapi_state->smb_krb5_context);
 177         if (ret) {
 178                 DEBUG(1,("gensec_krb5_start: krb5_init_context failed (%s)\n",
 179                          error_message(ret)));
 180                 talloc_free(gensec_gssapi_state);
 181                 return NT_STATUS_INTERNAL_ERROR;
 182         }
 183
 184         gensec_gssapi_state->client_cred = NULL;
 185         gensec_gssapi_state->server_cred = NULL;
 186
 187         gensec_gssapi_state->lucid = NULL;
 188
 189         gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
 190
 191         gensec_gssapi_state->sasl = false;
 192         gensec_gssapi_state->sasl_state = STAGE_GSS_NEG;
 193         gensec_gssapi_state->sasl_protection = 0;
 194
 195         gensec_gssapi_state->max_wrap_buf_size
 196                 = gensec_setting_int(gensec_security->settings, "gensec_gssapi", "max wrap buf size", 65536);
 197         gensec_gssapi_state->gss_exchange_count = 0;
 198         gensec_gssapi_state->sig_size = 0;
 199
 200         talloc_set_destructor(gensec_gssapi_state, gensec_gssapi_destructor);
 201
 202         realm = lpcfg_realm(gensec_security->settings->lp_ctx);
 203         if (realm != NULL) {
 204                 ret = gsskrb5_set_default_realm(realm);
 205                 if (ret) {
 206                         DEBUG(1,("gensec_krb5_start: gsskrb5_set_default_realm failed\n"));
 207                         talloc_free(gensec_gssapi_state);
 208                         return NT_STATUS_INTERNAL_ERROR;
 209                 }
 210         }
 211
 212         /* don't do DNS lookups of any kind, it might/will fail for a netbios name */
 213         ret = gsskrb5_set_dns_canonicalize(gensec_setting_bool(gensec_security->settings, "krb5", "set_dns_canonicalize", false));
 214         if (ret) {
 215                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_dns_canonicalize failed\n"));
 216                 talloc_free(gensec_gssapi_state);
 217                 return NT_STATUS_INTERNAL_ERROR;
 218         }
 219
 220         return NT_STATUS_OK;
 221 }
 222
 223 static NTSTATUS gensec_gssapi_server_start(struct gensec_security *gensec_security)
 224 {
 225         NTSTATUS nt_status;
 226         int ret;
 227         struct gensec_gssapi_state *gensec_gssapi_state;
 228         struct cli_credentials *machine_account;
 229         struct gssapi_creds_container *gcc;
 230
 231         nt_status = gensec_gssapi_start(gensec_security);
 232         if (!NT_STATUS_IS_OK(nt_status)) {
 233                 return nt_status;
 234         }
 235
 236         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 237
 238         machine_account = gensec_get_credentials(gensec_security);
 239
 240         if (!machine_account) {
 241                 DEBUG(3, ("No machine account credentials specified\n"));
 242                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 243         } else {
 244                 ret = cli_credentials_get_server_gss_creds(machine_account,
 245                                                            gensec_security->settings->lp_ctx, &gcc);
 246                 if (ret) {
 247                         DEBUG(1, ("Aquiring acceptor credentials failed: %s\n",
 248                                   error_message(ret)));
 249                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 250                 }
 251         }
 252
 253         gensec_gssapi_state->server_cred = gcc;
 254         return NT_STATUS_OK;
 255
 256 }
 257
 258 static NTSTATUS gensec_gssapi_sasl_server_start(struct gensec_security *gensec_security)
 259 {
 260         NTSTATUS nt_status;
 261         struct gensec_gssapi_state *gensec_gssapi_state;
 262         nt_status = gensec_gssapi_server_start(gensec_security);
 263
 264         if (NT_STATUS_IS_OK(nt_status)) {
 265                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 266                 gensec_gssapi_state->sasl = true;
 267         }
 268         return nt_status;
 269 }
 270
 271 static NTSTATUS gensec_gssapi_client_creds(struct gensec_security *gensec_security,
 272                                            struct tevent_context *ev)
 273 {
 274         struct gensec_gssapi_state *gensec_gssapi_state;
 275         struct gssapi_creds_container *gcc;
 276         struct cli_credentials *creds = gensec_get_credentials(gensec_security);
 277         const char *error_string;
 278         int ret;
 279
 280         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 281
 282         /* Only run this the first time the update() call is made */
 283         if (gensec_gssapi_state->client_cred) {
 284                 return NT_STATUS_OK;
 285         }
 286
 287         ret = cli_credentials_get_client_gss_creds(creds,
 288                                                    ev,
 289                                                    gensec_security->settings->lp_ctx, &gcc, &error_string);
 290         switch (ret) {
 291         case 0:
 292                 break;
 293         case EINVAL:
 294                 DEBUG(3, ("Cannot obtain client GSS credentials we need to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
 295                 return NT_STATUS_INVALID_PARAMETER;
 296         case KRB5KDC_ERR_PREAUTH_FAILED:
 297         case KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN:
 298                 DEBUG(1, ("Wrong username or password: %s\n", error_string));
 299                 return NT_STATUS_LOGON_FAILURE;
 300         case KRB5_KDC_UNREACH:
 301                 DEBUG(3, ("Cannot reach a KDC we require to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
 302                 return NT_STATUS_NO_LOGON_SERVERS;
 303         case KRB5_CC_NOTFOUND:
 304         case KRB5_CC_END:
 305                 DEBUG(2, ("Error obtaining ticket we require to contact %s: (possibly due to clock skew between us and the KDC) %s\n", gensec_gssapi_state->target_principal, error_string));
 306                 return NT_STATUS_TIME_DIFFERENCE_AT_DC;
 307         default:
 308                 DEBUG(1, ("Aquiring initiator credentials failed: %s\n", error_string));
 309                 return NT_STATUS_UNSUCCESSFUL;
 310         }
 311
 312         gensec_gssapi_state->client_cred = gcc;
 313         if (!talloc_reference(gensec_gssapi_state, gcc)) {
 314                 return NT_STATUS_NO_MEMORY;
 315         }
 316
 317         return NT_STATUS_OK;
 318 }
 319
 320 static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_security)
 321 {
 322         struct gensec_gssapi_state *gensec_gssapi_state;
 323         struct cli_credentials *creds = gensec_get_credentials(gensec_security);
 324         NTSTATUS nt_status;
 325         gss_buffer_desc name_token;
 326         gss_OID name_type;
 327         OM_uint32 maj_stat, min_stat;
 328         const char *hostname = gensec_get_target_hostname(gensec_security);
 329
 330         if (!hostname) {
 331                 DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
 332                 return NT_STATUS_INVALID_PARAMETER;
 333         }
 334         if (is_ipaddress(hostname)) {
 335                 DEBUG(2, ("Cannot do GSSAPI to an IP address\n"));
 336                 return NT_STATUS_INVALID_PARAMETER;
 337         }
 338         if (strcmp(hostname, "localhost") == 0) {
 339                 DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
 340                 return NT_STATUS_INVALID_PARAMETER;
 341         }
 342
 343         nt_status = gensec_gssapi_start(gensec_security);
 344         if (!NT_STATUS_IS_OK(nt_status)) {
 345                 return nt_status;
 346         }
 347
 348         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 349
 350         if (cli_credentials_get_impersonate_principal(creds)) {
 351                 gensec_gssapi_state->gss_want_flags &= ~(GSS_C_DELEG_FLAG|GSS_C_DELEG_POLICY_FLAG);
 352         }
 353
 354         gensec_gssapi_state->target_principal = gensec_get_target_principal(gensec_security);
 355         if (gensec_gssapi_state->target_principal) {
 356                 name_type = GSS_C_NULL_OID;
 357         } else {
 358                 gensec_gssapi_state->target_principal = talloc_asprintf(gensec_gssapi_state, "%s/%s@%s",
 359                                             gensec_get_target_service(gensec_security),
 360                                             hostname, lpcfg_realm(gensec_security->settings->lp_ctx));
 361
 362                 name_type = GSS_C_NT_USER_NAME;
 363         }
 364         name_token.value  = discard_const_p(uint8_t, gensec_gssapi_state->target_principal);
 365         name_token.length = strlen(gensec_gssapi_state->target_principal);
 366
 367
 368         maj_stat = gss_import_name (&min_stat,
 369                                     &name_token,
 370                                     name_type,
 371                                     &gensec_gssapi_state->server_name);
 372         if (maj_stat) {
 373                 DEBUG(2, ("GSS Import name of %s failed: %s\n",
 374                           (char *)name_token.value,
 375                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 376                 return NT_STATUS_INVALID_PARAMETER;
 377         }
 378
 379         return NT_STATUS_OK;
 380 }
 381
 382 static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
 383 {
 384         NTSTATUS nt_status;
 385         struct gensec_gssapi_state *gensec_gssapi_state;
 386         nt_status = gensec_gssapi_client_start(gensec_security);
 387
 388         if (NT_STATUS_IS_OK(nt_status)) {
 389                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 390                 gensec_gssapi_state->sasl = true;
 391         }
 392         return nt_status;
 393 }
 394
 395
 396 /**
 397  * Next state function for the GSSAPI GENSEC mechanism
 398  *
 399  * @param gensec_gssapi_state GSSAPI State
 400  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 401  * @param in The request, as a DATA_BLOB
 402  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 403  * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
 404  *                or NT_STATUS_OK if the user is authenticated.
 405  */
 406
 407 static NTSTATUS gensec_gssapi_update(struct gensec_security *gensec_security,
 408                                      TALLOC_CTX *out_mem_ctx,
 409                                      struct tevent_context *ev,
 410                                      const DATA_BLOB in, DATA_BLOB *out)
 411 {
 412         struct gensec_gssapi_state *gensec_gssapi_state
 413                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 414         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 415         OM_uint32 maj_stat, min_stat;
 416         OM_uint32 min_stat2;
 417         gss_buffer_desc input_token, output_token;
 418         gss_OID gss_oid_p = NULL;
 419         OM_uint32 time_req = 0;
 420         OM_uint32 time_rec = 0;
 421         struct timeval tv;
 422
 423         time_req = gensec_setting_int(gensec_security->settings,
 424                                       "gensec_gssapi", "requested_life_time",
 425                                       time_req);
 426
 427         input_token.length = in.length;
 428         input_token.value = in.data;
 429
 430         switch (gensec_gssapi_state->sasl_state) {
 431         case STAGE_GSS_NEG:
 432         {
 433                 switch (gensec_security->gensec_role) {
 434                 case GENSEC_CLIENT:
 435                 {
 436                         struct gsskrb5_send_to_kdc send_to_kdc;
 437                         krb5_error_code ret;
 438
 439                         nt_status = gensec_gssapi_client_creds(gensec_security, ev);
 440                         if (!NT_STATUS_IS_OK(nt_status)) {
 441                                 return nt_status;
 442                         }
 443
 444 #ifdef SAMBA4_USES_HEIMDAL
 445                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 446                         send_to_kdc.ptr = ev;
 447 #endif
 448
 449                         min_stat = gsskrb5_set_send_to_kdc(&send_to_kdc);
 450                         if (min_stat) {
 451                                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
 452                                 return NT_STATUS_INTERNAL_ERROR;
 453                         }
 454
 455                         maj_stat = gss_init_sec_context(&min_stat,
 456                                                         gensec_gssapi_state->client_cred->creds,
 457                                                         &gensec_gssapi_state->gssapi_context,
 458                                                         gensec_gssapi_state->server_name,
 459                                                         gensec_gssapi_state->gss_oid,
 460                                                         gensec_gssapi_state->gss_want_flags,
 461                                                         time_req,
 462                                                         gensec_gssapi_state->input_chan_bindings,
 463                                                         &input_token,
 464                                                         &gss_oid_p,
 465                                                         &output_token,
 466                                                         &gensec_gssapi_state->gss_got_flags, /* ret flags */
 467                                                         &time_rec);
 468                         if (gss_oid_p) {
 469                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 470                         }
 471
 472 #ifdef SAMBA4_USES_HEIMDAL
 473                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 474                         send_to_kdc.ptr = NULL;
 475 #endif
 476
 477                         ret = gsskrb5_set_send_to_kdc(&send_to_kdc);
 478                         if (ret) {
 479                                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
 480                                 return NT_STATUS_INTERNAL_ERROR;
 481                         }
 482
 483                         break;
 484                 }
 485                 case GENSEC_SERVER:
 486                 {
 487                         maj_stat = gss_accept_sec_context(&min_stat,
 488                                                           &gensec_gssapi_state->gssapi_context,
 489                                                           gensec_gssapi_state->server_cred->creds,
 490                                                           &input_token,
 491                                                           gensec_gssapi_state->input_chan_bindings,
 492                                                           &gensec_gssapi_state->client_name,
 493                                                           &gss_oid_p,
 494                                                           &output_token,
 495                                                           &gensec_gssapi_state->gss_got_flags,
 496                                                           &time_rec,
 497                                                           &gensec_gssapi_state->delegated_cred_handle);
 498                         if (gss_oid_p) {
 499                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 500                         }
 501                         break;
 502                 }
 503                 default:
 504                         return NT_STATUS_INVALID_PARAMETER;
 505
 506                 }
 507
 508                 gensec_gssapi_state->gss_exchange_count++;
 509
 510                 if (maj_stat == GSS_S_COMPLETE) {
 511                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 512                         gss_release_buffer(&min_stat2, &output_token);
 513
 514                         if (gensec_gssapi_state->gss_got_flags & GSS_C_DELEG_FLAG) {
 515                                 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
 516                         } else {
 517                                 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
 518                         }
 519
 520                         tv = timeval_current_ofs(time_rec, 0);
 521                         gensec_gssapi_state->expire_time = timeval_to_nttime(&tv);
 522
 523                         /* We may have been invoked as SASL, so there
 524                          * is more work to do */
 525                         if (gensec_gssapi_state->sasl) {
 526                                 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
 527                                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 528                         } else {
 529                                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 530
 531                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 532                                         DEBUG(5, ("GSSAPI Connection will be cryptographically sealed\n"));
 533                                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 534                                         DEBUG(5, ("GSSAPI Connection will be cryptographically signed\n"));
 535                                 } else {
 536                                         DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
 537                                 }
 538
 539                                 return NT_STATUS_OK;
 540                         }
 541                 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
 542                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 543                         gss_release_buffer(&min_stat2, &output_token);
 544
 545                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 546                 } else if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
 547                         gss_cred_id_t creds;
 548                         gss_name_t name;
 549                         gss_buffer_desc buffer;
 550                         OM_uint32 lifetime = 0;
 551                         gss_cred_usage_t usage;
 552                         const char *role = NULL;
 553                         DEBUG(0, ("GSS %s Update(krb5)(%d) Update failed, credentials expired during GSSAPI handshake!\n",
 554                                   role,
 555                                   gensec_gssapi_state->gss_exchange_count));
 556
 557
 558                         switch (gensec_security->gensec_role) {
 559                         case GENSEC_CLIENT:
 560                                 creds = gensec_gssapi_state->client_cred->creds;
 561                                 role = "client";
 562                                 break;
 563                         case GENSEC_SERVER:
 564                                 creds = gensec_gssapi_state->server_cred->creds;
 565                                 role = "server";
 566                                 break;
 567                         }
 568
 569                         maj_stat = gss_inquire_cred(&min_stat,
 570                                                     creds,
 571                                                     &name, &lifetime, &usage, NULL);
 572
 573                         if (maj_stat == GSS_S_COMPLETE) {
 574                                 const char *usage_string;
 575                                 switch (usage) {
 576                                 case GSS_C_BOTH:
 577                                         usage_string = "GSS_C_BOTH";
 578                                         break;
 579                                 case GSS_C_ACCEPT:
 580                                         usage_string = "GSS_C_ACCEPT";
 581                                         break;
 582                                 case GSS_C_INITIATE:
 583                                         usage_string = "GSS_C_INITIATE";
 584                                         break;
 585                                 }
 586                                 maj_stat = gss_display_name(&min_stat, name, &buffer, NULL);
 587                                 if (maj_stat) {
 588                                         buffer.value = NULL;
 589                                         buffer.length = 0;
 590                                 }
 591                                 if (lifetime > 0) {
 592                                         DEBUG(0, ("GSSAPI gss_inquire_cred indicates expiry of %*.*s in %u sec for %s\n",
 593                                                   (int)buffer.length, (int)buffer.length, (char *)buffer.value,
 594                                                   lifetime, usage_string));
 595                                 } else {
 596                                         DEBUG(0, ("GSSAPI gss_inquire_cred indicates %*.*s has already expired for %s\n",
 597                                                   (int)buffer.length, (int)buffer.length, (char *)buffer.value,
 598                                                   usage_string));
 599                                 }
 600                                 gss_release_buffer(&min_stat, &buffer);
 601                                 gss_release_name(&min_stat, &name);
 602                         } else if (maj_stat != GSS_S_COMPLETE) {
 603                                 DEBUG(0, ("inquiry of credential lifefime via GSSAPI gss_inquire_cred failed: %s\n",
 604                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 605                         }
 606                         return NT_STATUS_INVALID_PARAMETER;
 607                 } else if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
 608                         switch (min_stat) {
 609                         case KRB5KRB_AP_ERR_TKT_NYV:
 610                                 DEBUG(1, ("Error with ticket to contact %s: possible clock skew between us and the KDC or target server: %s\n",
 611                                           gensec_gssapi_state->target_principal,
 612                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 613                                 return NT_STATUS_TIME_DIFFERENCE_AT_DC; /* Make SPNEGO ignore us, we can't go any further here */
 614                         case KRB5KRB_AP_ERR_TKT_EXPIRED:
 615                                 DEBUG(1, ("Error with ticket to contact %s: ticket is expired, possible clock skew between us and the KDC or target server: %s\n",
 616                                           gensec_gssapi_state->target_principal,
 617                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 618                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 619                         case KRB5_KDC_UNREACH:
 620                                 DEBUG(3, ("Cannot reach a KDC we require in order to obtain a ticetk to %s: %s\n",
 621                                           gensec_gssapi_state->target_principal,
 622                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 623                                 return NT_STATUS_NO_LOGON_SERVERS; /* Make SPNEGO ignore us, we can't go any further here */
 624                         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 625                                 DEBUG(3, ("Server %s is not registered with our KDC: %s\n",
 626                                           gensec_gssapi_state->target_principal,
 627                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 628                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 629                         case KRB5KRB_AP_ERR_MSG_TYPE:
 630                                 /* garbage input, possibly from the auto-mech detection */
 631                                 return NT_STATUS_INVALID_PARAMETER;
 632                         default:
 633                                 DEBUG(1, ("GSS %s Update(krb5)(%d) Update failed: %s\n",
 634                                           gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 635                                           gensec_gssapi_state->gss_exchange_count,
 636                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 637                                 return nt_status;
 638                         }
 639                 } else {
 640                         DEBUG(1, ("GSS %s Update(%d) failed: %s\n",
 641                                   gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 642                                   gensec_gssapi_state->gss_exchange_count,
 643                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 644                         return nt_status;
 645                 }
 646                 break;
 647         }
 648
 649         /* These last two stages are only done if we were invoked as SASL */
 650         case STAGE_SASL_SSF_NEG:
 651         {
 652                 switch (gensec_security->gensec_role) {
 653                 case GENSEC_CLIENT:
 654                 {
 655                         uint8_t maxlength_proposed[4];
 656                         uint8_t maxlength_accepted[4];
 657                         uint8_t security_supported;
 658                         int conf_state;
 659                         gss_qop_t qop_state;
 660                         input_token.length = in.length;
 661                         input_token.value = in.data;
 662
 663                         /* As a client, we have just send a
 664                          * zero-length blob to the server (after the
 665                          * normal GSSAPI exchange), and it has replied
 666                          * with it's SASL negotiation */
 667
 668                         maj_stat = gss_unwrap(&min_stat,
 669                                               gensec_gssapi_state->gssapi_context,
 670                                               &input_token,
 671                                               &output_token,
 672                                               &conf_state,
 673                                               &qop_state);
 674                         if (GSS_ERROR(maj_stat)) {
 675                                 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 676                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 677                                 return NT_STATUS_ACCESS_DENIED;
 678                         }
 679
 680                         if (output_token.length < 4) {
 681                                 return NT_STATUS_INVALID_PARAMETER;
 682                         }
 683
 684                         memcpy(maxlength_proposed, output_token.value, 4);
 685                         gss_release_buffer(&min_stat, &output_token);
 686
 687                         /* first byte is the proposed security */
 688                         security_supported = maxlength_proposed[0];
 689                         maxlength_proposed[0] = '\0';
 690
 691                         /* Rest is the proposed max wrap length */
 692                         gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
 693                                                                      gensec_gssapi_state->max_wrap_buf_size);
 694                         gensec_gssapi_state->sasl_protection = 0;
 695                         if (security_supported & NEG_SEAL) {
 696                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 697                                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 698                                 }
 699                         }
 700                         if (security_supported & NEG_SIGN) {
 701                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 702                                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 703                                 }
 704                         }
 705                         if (security_supported & NEG_NONE) {
 706                                 gensec_gssapi_state->sasl_protection |= NEG_NONE;
 707                         }
 708                         if (gensec_gssapi_state->sasl_protection == 0) {
 709                                 DEBUG(1, ("Remote server does not support unprotected connections\n"));
 710                                 return NT_STATUS_ACCESS_DENIED;
 711                         }
 712
 713                         /* Send back the negotiated max length */
 714
 715                         RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
 716
 717                         maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
 718
 719                         input_token.value = maxlength_accepted;
 720                         input_token.length = sizeof(maxlength_accepted);
 721
 722                         maj_stat = gss_wrap(&min_stat,
 723                                             gensec_gssapi_state->gssapi_context,
 724                                             false,
 725                                             GSS_C_QOP_DEFAULT,
 726                                             &input_token,
 727                                             &conf_state,
 728                                             &output_token);
 729                         if (GSS_ERROR(maj_stat)) {
 730                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 731                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 732                                 return NT_STATUS_ACCESS_DENIED;
 733                         }
 734
 735                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 736                         gss_release_buffer(&min_stat, &output_token);
 737
 738                         /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 739                         gensec_gssapi_state->sasl_state = STAGE_DONE;
 740
 741                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 742                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically sealed\n"));
 743                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 744                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically signed\n"));
 745                         } else {
 746                                 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographically protection\n"));
 747                         }
 748
 749                         return NT_STATUS_OK;
 750                 }
 751                 case GENSEC_SERVER:
 752                 {
 753                         uint8_t maxlength_proposed[4];
 754                         uint8_t security_supported = 0x0;
 755                         int conf_state;
 756
 757                         /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
 758                         if (in.length != 0) {
 759                                 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
 760                         }
 761
 762                         /* Give the client some idea what we will support */
 763
 764                         RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
 765                         /* first byte is the proposed security */
 766                         maxlength_proposed[0] = '\0';
 767
 768                         gensec_gssapi_state->sasl_protection = 0;
 769                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 770                                 security_supported |= NEG_SEAL;
 771                         }
 772                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 773                                 security_supported |= NEG_SIGN;
 774                         }
 775                         if (security_supported == 0) {
 776                                 /* If we don't support anything, this must be 0 */
 777                                 RSIVAL(maxlength_proposed, 0, 0x0);
 778                         }
 779
 780                         /* TODO:  We may not wish to support this */
 781                         security_supported |= NEG_NONE;
 782                         maxlength_proposed[0] = security_supported;
 783
 784                         input_token.value = maxlength_proposed;
 785                         input_token.length = sizeof(maxlength_proposed);
 786
 787                         maj_stat = gss_wrap(&min_stat,
 788                                             gensec_gssapi_state->gssapi_context,
 789                                             false,
 790                                             GSS_C_QOP_DEFAULT,
 791                                             &input_token,
 792                                             &conf_state,
 793                                             &output_token);
 794                         if (GSS_ERROR(maj_stat)) {
 795                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 796                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 797                                 return NT_STATUS_ACCESS_DENIED;
 798                         }
 799
 800                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 801                         gss_release_buffer(&min_stat, &output_token);
 802
 803                         gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
 804                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 805                 }
 806                 default:
 807                         return NT_STATUS_INVALID_PARAMETER;
 808
 809                 }
 810         }
 811         /* This is s server-only stage */
 812         case STAGE_SASL_SSF_ACCEPT:
 813         {
 814                 uint8_t maxlength_accepted[4];
 815                 uint8_t security_accepted;
 816                 int conf_state;
 817                 gss_qop_t qop_state;
 818                 input_token.length = in.length;
 819                 input_token.value = in.data;
 820
 821                 maj_stat = gss_unwrap(&min_stat,
 822                                       gensec_gssapi_state->gssapi_context,
 823                                       &input_token,
 824                                       &output_token,
 825                                       &conf_state,
 826                                       &qop_state);
 827                 if (GSS_ERROR(maj_stat)) {
 828                         DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 829                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 830                         return NT_STATUS_ACCESS_DENIED;
 831                 }
 832
 833                 if (output_token.length < 4) {
 834                         return NT_STATUS_INVALID_PARAMETER;
 835                 }
 836
 837                 memcpy(maxlength_accepted, output_token.value, 4);
 838                 gss_release_buffer(&min_stat, &output_token);
 839
 840                 /* first byte is the proposed security */
 841                 security_accepted = maxlength_accepted[0];
 842                 maxlength_accepted[0] = '\0';
 843
 844                 /* Rest is the proposed max wrap length */
 845                 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
 846                                                              gensec_gssapi_state->max_wrap_buf_size);
 847
 848                 gensec_gssapi_state->sasl_protection = 0;
 849                 if (security_accepted & NEG_SEAL) {
 850                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 851                                 DEBUG(1, ("Remote client wanted seal, but gensec refused\n"));
 852                                 return NT_STATUS_ACCESS_DENIED;
 853                         }
 854                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 855                 }
 856                 if (security_accepted & NEG_SIGN) {
 857                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 858                                 DEBUG(1, ("Remote client wanted sign, but gensec refused\n"));
 859                                 return NT_STATUS_ACCESS_DENIED;
 860                         }
 861                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 862                 }
 863                 if (security_accepted & NEG_NONE) {
 864                         gensec_gssapi_state->sasl_protection |= NEG_NONE;
 865                 }
 866
 867                 /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 868                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 869                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 870                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically sealed\n"));
 871                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 872                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically signed\n"));
 873                 } else {
 874                         DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
 875                 }
 876
 877                 *out = data_blob(NULL, 0);
 878                 return NT_STATUS_OK;
 879         }
 880         default:
 881                 return NT_STATUS_INVALID_PARAMETER;
 882         }
 883 }
 884
 885 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
 886                                    TALLOC_CTX *mem_ctx,
 887                                    const DATA_BLOB *in,
 888                                    DATA_BLOB *out)
 889 {
 890         struct gensec_gssapi_state *gensec_gssapi_state
 891                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 892         OM_uint32 maj_stat, min_stat;
 893         gss_buffer_desc input_token, output_token;
 894         int conf_state;
 895         input_token.length = in->length;
 896         input_token.value = in->data;
 897
 898         maj_stat = gss_wrap(&min_stat,
 899                             gensec_gssapi_state->gssapi_context,
 900                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 901                             GSS_C_QOP_DEFAULT,
 902                             &input_token,
 903                             &conf_state,
 904                             &output_token);
 905         if (GSS_ERROR(maj_stat)) {
 906                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 907                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 908                 return NT_STATUS_ACCESS_DENIED;
 909         }
 910
 911         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 912         gss_release_buffer(&min_stat, &output_token);
 913
 914         if (gensec_gssapi_state->sasl) {
 915                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 916                 if (max_wrapped_size < out->length) {
 917                         DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
 918                                   (unsigned)in->length,
 919                                   (unsigned)out->length,
 920                                   (unsigned int)max_wrapped_size));
 921                         return NT_STATUS_INVALID_PARAMETER;
 922                 }
 923         }
 924
 925         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 926             && !conf_state) {
 927                 return NT_STATUS_ACCESS_DENIED;
 928         }
 929         return NT_STATUS_OK;
 930 }
 931
 932 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
 933                                      TALLOC_CTX *mem_ctx,
 934                                      const DATA_BLOB *in,
 935                                      DATA_BLOB *out)
 936 {
 937         struct gensec_gssapi_state *gensec_gssapi_state
 938                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 939         OM_uint32 maj_stat, min_stat;
 940         gss_buffer_desc input_token, output_token;
 941         int conf_state;
 942         gss_qop_t qop_state;
 943         input_token.length = in->length;
 944         input_token.value = in->data;
 945
 946         if (gensec_gssapi_state->sasl) {
 947                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 948                 if (max_wrapped_size < in->length) {
 949                         DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
 950                         return NT_STATUS_INVALID_PARAMETER;
 951                 }
 952         }
 953
 954         maj_stat = gss_unwrap(&min_stat,
 955                               gensec_gssapi_state->gssapi_context,
 956                               &input_token,
 957                               &output_token,
 958                               &conf_state,
 959                               &qop_state);
 960         if (GSS_ERROR(maj_stat)) {
 961                 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
 962                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 963                 return NT_STATUS_ACCESS_DENIED;
 964         }
 965
 966         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 967         gss_release_buffer(&min_stat, &output_token);
 968
 969         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 970             && !conf_state) {
 971                 return NT_STATUS_ACCESS_DENIED;
 972         }
 973         return NT_STATUS_OK;
 974 }
 975
 976 /* Find out the maximum input size negotiated on this connection */
 977
 978 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
 979 {
 980         struct gensec_gssapi_state *gensec_gssapi_state
 981                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 982         OM_uint32 maj_stat, min_stat;
 983         OM_uint32 max_input_size;
 984
 985         maj_stat = gss_wrap_size_limit(&min_stat,
 986                                        gensec_gssapi_state->gssapi_context,
 987                                        gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 988                                        GSS_C_QOP_DEFAULT,
 989                                        gensec_gssapi_state->max_wrap_buf_size,
 990                                        &max_input_size);
 991         if (GSS_ERROR(maj_stat)) {
 992                 TALLOC_CTX *mem_ctx = talloc_new(NULL);
 993                 DEBUG(1, ("gensec_gssapi_max_input_size: determinaing signature size with gss_wrap_size_limit failed: %s\n",
 994                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 995                 talloc_free(mem_ctx);
 996                 return 0;
 997         }
 998
 999         return max_input_size;
1000 }
1001
1002 /* Find out the maximum output size negotiated on this connection */
1003 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
1004 {
1005         struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
1006         return gensec_gssapi_state->max_wrap_buf_size;
1007 }
1008
1009 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
1010                                           TALLOC_CTX *mem_ctx,
1011                                           uint8_t *data, size_t length,
1012                                           const uint8_t *whole_pdu, size_t pdu_length,
1013                                           DATA_BLOB *sig)
1014 {
1015         struct gensec_gssapi_state *gensec_gssapi_state
1016                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1017         OM_uint32 maj_stat, min_stat;
1018         gss_buffer_desc input_token, output_token;
1019         int conf_state;
1020         ssize_t sig_length;
1021
1022         input_token.length = length;
1023         input_token.value = data;
1024
1025         maj_stat = gss_wrap(&min_stat,
1026                             gensec_gssapi_state->gssapi_context,
1027                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
1028                             GSS_C_QOP_DEFAULT,
1029                             &input_token,
1030                             &conf_state,
1031                             &output_token);
1032         if (GSS_ERROR(maj_stat)) {
1033                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
1034                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1035                 return NT_STATUS_ACCESS_DENIED;
1036         }
1037
1038         if (output_token.length < input_token.length) {
1039                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
1040                           (long)output_token.length, (long)length));
1041                 return NT_STATUS_INTERNAL_ERROR;
1042         }
1043         sig_length = output_token.length - input_token.length;
1044
1045         memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
1046         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
1047
1048         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1049         dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
1050         dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
1051
1052         gss_release_buffer(&min_stat, &output_token);
1053
1054         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1055             && !conf_state) {
1056                 return NT_STATUS_ACCESS_DENIED;
1057         }
1058         return NT_STATUS_OK;
1059 }
1060
1061 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
1062                                             uint8_t *data, size_t length,
1063                                             const uint8_t *whole_pdu, size_t pdu_length,
1064                                             const DATA_BLOB *sig)
1065 {
1066         struct gensec_gssapi_state *gensec_gssapi_state
1067                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1068         OM_uint32 maj_stat, min_stat;
1069         gss_buffer_desc input_token, output_token;
1070         int conf_state;
1071         gss_qop_t qop_state;
1072         DATA_BLOB in;
1073
1074         dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
1075
1076         in = data_blob_talloc(gensec_security, NULL, sig->length + length);
1077
1078         memcpy(in.data, sig->data, sig->length);
1079         memcpy(in.data + sig->length, data, length);
1080
1081         input_token.length = in.length;
1082         input_token.value = in.data;
1083
1084         maj_stat = gss_unwrap(&min_stat,
1085                               gensec_gssapi_state->gssapi_context,
1086                               &input_token,
1087                               &output_token,
1088                               &conf_state,
1089                               &qop_state);
1090         talloc_free(in.data);
1091         if (GSS_ERROR(maj_stat)) {
1092                 char *error_string = gssapi_error_string(NULL, maj_stat, min_stat, gensec_gssapi_state->gss_oid);
1093                 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
1094                           error_string));
1095                 talloc_free(error_string);
1096                 return NT_STATUS_ACCESS_DENIED;
1097         }
1098
1099         if (output_token.length != length) {
1100                 return NT_STATUS_INTERNAL_ERROR;
1101         }
1102
1103         memcpy(data, output_token.value, length);
1104
1105         gss_release_buffer(&min_stat, &output_token);
1106
1107         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1108             && !conf_state) {
1109                 return NT_STATUS_ACCESS_DENIED;
1110         }
1111         return NT_STATUS_OK;
1112 }
1113
1114 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1115                                           TALLOC_CTX *mem_ctx,
1116                                           const uint8_t *data, size_t length,
1117                                           const uint8_t *whole_pdu, size_t pdu_length,
1118                                           DATA_BLOB *sig)
1119 {
1120         struct gensec_gssapi_state *gensec_gssapi_state
1121                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1122         OM_uint32 maj_stat, min_stat;
1123         gss_buffer_desc input_token, output_token;
1124
1125         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1126                 input_token.length = pdu_length;
1127                 input_token.value = discard_const_p(uint8_t *, whole_pdu);
1128         } else {
1129                 input_token.length = length;
1130                 input_token.value = discard_const_p(uint8_t *, data);
1131         }
1132
1133         maj_stat = gss_get_mic(&min_stat,
1134                             gensec_gssapi_state->gssapi_context,
1135                             GSS_C_QOP_DEFAULT,
1136                             &input_token,
1137                             &output_token);
1138         if (GSS_ERROR(maj_stat)) {
1139                 DEBUG(1, ("GSS GetMic failed: %s\n",
1140                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1141                 return NT_STATUS_ACCESS_DENIED;
1142         }
1143
1144         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, output_token.length);
1145
1146         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1147
1148         gss_release_buffer(&min_stat, &output_token);
1149
1150         return NT_STATUS_OK;
1151 }
1152
1153 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1154                                            const uint8_t *data, size_t length,
1155                                            const uint8_t *whole_pdu, size_t pdu_length,
1156                                            const DATA_BLOB *sig)
1157 {
1158         struct gensec_gssapi_state *gensec_gssapi_state
1159                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1160         OM_uint32 maj_stat, min_stat;
1161         gss_buffer_desc input_token;
1162         gss_buffer_desc input_message;
1163         gss_qop_t qop_state;
1164
1165         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1166
1167         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1168                 input_message.length = pdu_length;
1169                 input_message.value = discard_const(whole_pdu);
1170         } else {
1171                 input_message.length = length;
1172                 input_message.value = discard_const(data);
1173         }
1174
1175         input_token.length = sig->length;
1176         input_token.value = sig->data;
1177
1178         maj_stat = gss_verify_mic(&min_stat,
1179                               gensec_gssapi_state->gssapi_context,
1180                               &input_message,
1181                               &input_token,
1182                               &qop_state);
1183         if (GSS_ERROR(maj_stat)) {
1184                 char *error_string = gssapi_error_string(NULL, maj_stat, min_stat, gensec_gssapi_state->gss_oid);
1185                 DEBUG(1, ("GSS VerifyMic failed: %s\n", error_string));
1186                 talloc_free(error_string);
1187
1188                 return NT_STATUS_ACCESS_DENIED;
1189         }
1190
1191         return NT_STATUS_OK;
1192 }
1193
1194 /* Try to figure out what features we actually got on the connection */
1195 static bool gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1196                                        uint32_t feature)
1197 {
1198         struct gensec_gssapi_state *gensec_gssapi_state
1199                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1200         if (feature & GENSEC_FEATURE_SIGN) {
1201                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1202                 if (gensec_gssapi_state->sasl
1203                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1204                         return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1205                                 && (gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG));
1206                 }
1207                 return gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG;
1208         }
1209         if (feature & GENSEC_FEATURE_SEAL) {
1210                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1211                 if (gensec_gssapi_state->sasl
1212                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1213                         return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1214                                  && (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG));
1215                 }
1216                 return gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG;
1217         }
1218         if (feature & GENSEC_FEATURE_SESSION_KEY) {
1219                 /* Only for GSSAPI/Krb5 */
1220                 if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
1221                         return true;
1222                 }
1223         }
1224         if (feature & GENSEC_FEATURE_DCE_STYLE) {
1225                 return gensec_gssapi_state->gss_got_flags & GSS_C_DCE_STYLE;
1226         }
1227         if (feature & GENSEC_FEATURE_NEW_SPNEGO) {
1228                 NTSTATUS status;
1229                 uint32_t keytype;
1230
1231                 if (!(gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG)) {
1232                         return false;
1233                 }
1234
1235                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "force_new_spnego", false)) {
1236                         return true;
1237                 }
1238                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "disable_new_spnego", false)) {
1239                         return false;
1240                 }
1241
1242                 status = gssapi_get_session_key(gensec_gssapi_state,
1243                                                 gensec_gssapi_state->gssapi_context, NULL, &keytype);
1244                 /*
1245                  * We should do a proper sig on the mechListMic unless
1246                  * we know we have to be backwards compatible with
1247                  * earlier windows versions.
1248                  *
1249                  * Negotiating a non-krb5
1250                  * mech for example should be regarded as having
1251                  * NEW_SPNEGO
1252                  */
1253                 if (NT_STATUS_IS_OK(status)) {
1254                         switch (keytype) {
1255                         case ENCTYPE_DES_CBC_CRC:
1256                         case ENCTYPE_DES_CBC_MD5:
1257                         case ENCTYPE_ARCFOUR_HMAC:
1258                         case ENCTYPE_DES3_CBC_SHA1:
1259                                 return false;
1260                         }
1261                 }
1262                 return true;
1263         }
1264         /* We can always do async (rather than strict request/reply) packets.  */
1265         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1266                 return true;
1267         }
1268         return false;
1269 }
1270
1271 static NTTIME gensec_gssapi_expire_time(struct gensec_security *gensec_security)
1272 {
1273         struct gensec_gssapi_state *gensec_gssapi_state =
1274                 talloc_get_type_abort(gensec_security->private_data,
1275                 struct gensec_gssapi_state);
1276
1277         return gensec_gssapi_state->expire_time;
1278 }
1279
1280 /*
1281  * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1282  * (for encrypting some passwords).
1283  *
1284  * This breaks all the abstractions, but what do you expect...
1285  */
1286 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1287                                           TALLOC_CTX *mem_ctx,
1288                                           DATA_BLOB *session_key)
1289 {
1290         struct gensec_gssapi_state *gensec_gssapi_state
1291                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1292         return gssapi_get_session_key(mem_ctx, gensec_gssapi_state->gssapi_context, session_key, NULL);
1293 }
1294
1295 /* Get some basic (and authorization) information about the user on
1296  * this session.  This uses either the PAC (if present) or a local
1297  * database lookup */
1298 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1299                                            TALLOC_CTX *mem_ctx,
1300                                            struct auth_session_info **_session_info)
1301 {
1302         NTSTATUS nt_status;
1303         TALLOC_CTX *tmp_ctx;
1304         struct gensec_gssapi_state *gensec_gssapi_state
1305                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1306         struct auth_session_info *session_info = NULL;
1307         OM_uint32 maj_stat, min_stat;
1308         DATA_BLOB pac_blob, *pac_blob_ptr = NULL;
1309
1310         gss_buffer_desc name_token;
1311         char *principal_string;
1312
1313         tmp_ctx = talloc_named(mem_ctx, 0, "gensec_gssapi_session_info context");
1314         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
1315
1316         maj_stat = gss_display_name (&min_stat,
1317                                      gensec_gssapi_state->client_name,
1318                                      &name_token,
1319                                      NULL);
1320         if (GSS_ERROR(maj_stat)) {
1321                 DEBUG(1, ("GSS display_name failed: %s\n",
1322                           gssapi_error_string(tmp_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1323                 talloc_free(tmp_ctx);
1324                 return NT_STATUS_FOOBAR;
1325         }
1326
1327         principal_string = talloc_strndup(tmp_ctx,
1328                                           (const char *)name_token.value,
1329                                           name_token.length);
1330
1331         gss_release_buffer(&min_stat, &name_token);
1332
1333         if (!principal_string) {
1334                 talloc_free(tmp_ctx);
1335                 return NT_STATUS_NO_MEMORY;
1336         }
1337
1338         nt_status = gssapi_obtain_pac_blob(tmp_ctx,  gensec_gssapi_state->gssapi_context,
1339                                            gensec_gssapi_state->client_name,
1340                                            &pac_blob);
1341
1342         /* IF we have the PAC - otherwise we need to get this
1343          * data from elsewere - local ldb, or (TODO) lookup of some
1344          * kind...
1345          */
1346         if (NT_STATUS_IS_OK(nt_status)) {
1347                 pac_blob_ptr = &pac_blob;
1348         }
1349         nt_status = gensec_generate_session_info_pac(tmp_ctx,
1350                                                      gensec_security,
1351                                                      gensec_gssapi_state->smb_krb5_context,
1352                                                      pac_blob_ptr, principal_string,
1353                                                      gensec_get_remote_address(gensec_security),
1354                                                      &session_info);
1355         if (!NT_STATUS_IS_OK(nt_status)) {
1356                 talloc_free(tmp_ctx);
1357                 return nt_status;
1358         }
1359
1360         nt_status = gensec_gssapi_session_key(gensec_security, session_info, &session_info->session_key);
1361         if (!NT_STATUS_IS_OK(nt_status)) {
1362                 talloc_free(tmp_ctx);
1363                 return nt_status;
1364         }
1365
1366         if (!(gensec_gssapi_state->gss_got_flags & GSS_C_DELEG_FLAG)) {
1367                 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1368         } else {
1369                 krb5_error_code ret;
1370                 const char *error_string;
1371
1372                 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1373                 session_info->credentials = cli_credentials_init(session_info);
1374                 if (!session_info->credentials) {
1375                         talloc_free(tmp_ctx);
1376                         return NT_STATUS_NO_MEMORY;
1377                 }
1378
1379                 cli_credentials_set_conf(session_info->credentials, gensec_security->settings->lp_ctx);
1380                 /* Just so we don't segfault trying to get at a username */
1381                 cli_credentials_set_anonymous(session_info->credentials);
1382
1383                 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1384                                                            gensec_security->settings->lp_ctx,
1385                                                            gensec_gssapi_state->delegated_cred_handle,
1386                                                            CRED_SPECIFIED, &error_string);
1387                 if (ret) {
1388                         talloc_free(tmp_ctx);
1389                         DEBUG(2,("Failed to get gss creds: %s\n", error_string));
1390                         return NT_STATUS_NO_MEMORY;
1391                 }
1392
1393                 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1394                 cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
1395
1396                 /* It has been taken from this place... */
1397                 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1398         }
1399         *_session_info = talloc_steal(mem_ctx, session_info);
1400         talloc_free(tmp_ctx);
1401
1402         return NT_STATUS_OK;
1403 }
1404
1405 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
1406 {
1407         struct gensec_gssapi_state *gensec_gssapi_state
1408                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1409         NTSTATUS status;
1410
1411         if (gensec_gssapi_state->sig_size) {
1412                 return gensec_gssapi_state->sig_size;
1413         }
1414
1415         if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1416                 gensec_gssapi_state->sig_size = 45;
1417         } else {
1418                 gensec_gssapi_state->sig_size = 37;
1419         }
1420
1421         status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1422         if (!NT_STATUS_IS_OK(status)) {
1423                 return gensec_gssapi_state->sig_size;
1424         }
1425
1426         if (gensec_gssapi_state->lucid->protocol == 1) {
1427                 if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1428                         /*
1429                          * TODO: windows uses 76 here, but we don't know
1430                          *       gss_wrap works with aes keys yet
1431                          */
1432                         gensec_gssapi_state->sig_size = 76;
1433                 } else {
1434                         gensec_gssapi_state->sig_size = 28;
1435                 }
1436         } else if (gensec_gssapi_state->lucid->protocol == 0) {
1437                 switch (gensec_gssapi_state->lucid->rfc1964_kd.ctx_key.type) {
1438                 case KEYTYPE_DES:
1439                 case KEYTYPE_ARCFOUR:
1440                 case KEYTYPE_ARCFOUR_56:
1441                         if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1442                                 gensec_gssapi_state->sig_size = 45;
1443                         } else {
1444                                 gensec_gssapi_state->sig_size = 37;
1445                         }
1446                         break;
1447                 case KEYTYPE_DES3:
1448                         if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1449                                 gensec_gssapi_state->sig_size = 57;
1450                         } else {
1451                                 gensec_gssapi_state->sig_size = 49;
1452                         }
1453                         break;
1454                 }
1455         }
1456
1457         return gensec_gssapi_state->sig_size;
1458 }
1459
1460 static const char *gensec_gssapi_krb5_oids[] = {
1461         GENSEC_OID_KERBEROS5_OLD,
1462         GENSEC_OID_KERBEROS5,
1463         NULL
1464 };
1465
1466 static const char *gensec_gssapi_spnego_oids[] = {
1467         GENSEC_OID_SPNEGO,
1468         NULL
1469 };
1470
1471 /* As a server, this could in theory accept any GSSAPI mech */
1472 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1473         .name           = "gssapi_spnego",
1474         .sasl_name      = "GSS-SPNEGO",
1475         .auth_type      = DCERPC_AUTH_TYPE_SPNEGO,
1476         .oid            = gensec_gssapi_spnego_oids,
1477         .client_start   = gensec_gssapi_client_start,
1478         .server_start   = gensec_gssapi_server_start,
1479         .magic          = gensec_magic_check_krb5_oid,
1480         .update         = gensec_gssapi_update,
1481         .session_key    = gensec_gssapi_session_key,
1482         .session_info   = gensec_gssapi_session_info,
1483         .sign_packet    = gensec_gssapi_sign_packet,
1484         .check_packet   = gensec_gssapi_check_packet,
1485         .seal_packet    = gensec_gssapi_seal_packet,
1486         .unseal_packet  = gensec_gssapi_unseal_packet,
1487         .wrap           = gensec_gssapi_wrap,
1488         .unwrap         = gensec_gssapi_unwrap,
1489         .have_feature   = gensec_gssapi_have_feature,
1490         .expire_time    = gensec_gssapi_expire_time,
1491         .enabled        = false,
1492         .kerberos       = true,
1493         .priority       = GENSEC_GSSAPI
1494 };
1495
1496 /* As a server, this could in theory accept any GSSAPI mech */
1497 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1498         .name           = "gssapi_krb5",
1499         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
1500         .oid            = gensec_gssapi_krb5_oids,
1501         .client_start   = gensec_gssapi_client_start,
1502         .server_start   = gensec_gssapi_server_start,
1503         .magic          = gensec_magic_check_krb5_oid,
1504         .update         = gensec_gssapi_update,
1505         .session_key    = gensec_gssapi_session_key,
1506         .session_info   = gensec_gssapi_session_info,
1507         .sig_size       = gensec_gssapi_sig_size,
1508         .sign_packet    = gensec_gssapi_sign_packet,
1509         .check_packet   = gensec_gssapi_check_packet,
1510         .seal_packet    = gensec_gssapi_seal_packet,
1511         .unseal_packet  = gensec_gssapi_unseal_packet,
1512         .wrap           = gensec_gssapi_wrap,
1513         .unwrap         = gensec_gssapi_unwrap,
1514         .have_feature   = gensec_gssapi_have_feature,
1515         .expire_time    = gensec_gssapi_expire_time,
1516         .enabled        = true,
1517         .kerberos       = true,
1518         .priority       = GENSEC_GSSAPI
1519 };
1520
1521 /* As a server, this could in theory accept any GSSAPI mech */
1522 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1523         .name             = "gssapi_krb5_sasl",
1524         .sasl_name        = "GSSAPI",
1525         .client_start     = gensec_gssapi_sasl_client_start,
1526         .server_start     = gensec_gssapi_sasl_server_start,
1527         .update           = gensec_gssapi_update,
1528         .session_key      = gensec_gssapi_session_key,
1529         .session_info     = gensec_gssapi_session_info,
1530         .max_input_size   = gensec_gssapi_max_input_size,
1531         .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1532         .wrap             = gensec_gssapi_wrap,
1533         .unwrap           = gensec_gssapi_unwrap,
1534         .have_feature     = gensec_gssapi_have_feature,
1535         .expire_time      = gensec_gssapi_expire_time,
1536         .enabled          = true,
1537         .kerberos         = true,
1538         .priority         = GENSEC_GSSAPI
1539 };
1540
1541 _PUBLIC_ NTSTATUS gensec_gssapi_init(void)
1542 {
1543         NTSTATUS ret;
1544
1545         ret = gensec_register(&gensec_gssapi_spnego_security_ops);
1546         if (!NT_STATUS_IS_OK(ret)) {
1547                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1548                         gensec_gssapi_spnego_security_ops.name));
1549                 return ret;
1550         }
1551
1552         ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1553         if (!NT_STATUS_IS_OK(ret)) {
1554                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1555                         gensec_gssapi_krb5_security_ops.name));
1556                 return ret;
1557         }
1558
1559         ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1560         if (!NT_STATUS_IS_OK(ret)) {
1561                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1562                         gensec_gssapi_sasl_krb5_security_ops.name));
1563                 return ret;
1564         }
1565
1566         return ret;
1567 }