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_internal.h"
  38 #include "auth/gensec/gensec_proto.h"
  39 #include "auth/gensec/gensec_toplevel_proto.h"
  40 #include "param/param.h"
  41 #include "auth/session_proto.h"
  42 #include "gensec_gssapi.h"
  43 #include "lib/util/util_net.h"
  44 #include "auth/kerberos/pac_utils.h"
  45
  46 #ifndef gss_mech_spnego
  47 gss_OID_desc spnego_mech_oid_desc =
  48                 { 6, discard_const_p(void, "\x2b\x06\x01\x05\x05\x02") };
  49 #define gss_mech_spnego (&spnego_mech_oid_desc)
  50 #endif
  51
  52 _PUBLIC_ NTSTATUS gensec_gssapi_init(void);
  53
  54 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security);
  55 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security);
  56
  57 static int gensec_gssapi_destructor(struct gensec_gssapi_state *gensec_gssapi_state)
  58 {
  59         OM_uint32 maj_stat, min_stat;
  60
  61         if (gensec_gssapi_state->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
  62                 maj_stat = gss_release_cred(&min_stat,
  63                                             &gensec_gssapi_state->delegated_cred_handle);
  64         }
  65
  66         if (gensec_gssapi_state->gssapi_context != GSS_C_NO_CONTEXT) {
  67                 maj_stat = gss_delete_sec_context (&min_stat,
  68                                                    &gensec_gssapi_state->gssapi_context,
  69                                                    GSS_C_NO_BUFFER);
  70         }
  71
  72         if (gensec_gssapi_state->server_name != GSS_C_NO_NAME) {
  73                 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->server_name);
  74         }
  75         if (gensec_gssapi_state->client_name != GSS_C_NO_NAME) {
  76                 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->client_name);
  77         }
  78
  79         if (gensec_gssapi_state->lucid) {
  80                 gss_krb5_free_lucid_sec_context(&min_stat, gensec_gssapi_state->lucid);
  81         }
  82
  83         return 0;
  84 }
  85
  86 static NTSTATUS gensec_gssapi_init_lucid(struct gensec_gssapi_state *gensec_gssapi_state)
  87 {
  88         OM_uint32 maj_stat, min_stat;
  89
  90         if (gensec_gssapi_state->lucid) {
  91                 return NT_STATUS_OK;
  92         }
  93
  94         maj_stat = gss_krb5_export_lucid_sec_context(&min_stat,
  95                                                      &gensec_gssapi_state->gssapi_context,
  96                                                      1,
  97                                                      (void **)&gensec_gssapi_state->lucid);
  98         if (maj_stat != GSS_S_COMPLETE) {
  99                 DEBUG(0,("gensec_gssapi_init_lucid: %s\n",
 100                         gssapi_error_string(gensec_gssapi_state,
 101                                             maj_stat, min_stat,
 102                                             gensec_gssapi_state->gss_oid)));
 103                 return NT_STATUS_INTERNAL_ERROR;
 104         }
 105
 106         if (gensec_gssapi_state->lucid->version != 1) {
 107                 DEBUG(0,("gensec_gssapi_init_lucid: lucid version[%d] != 1\n",
 108                         gensec_gssapi_state->lucid->version));
 109                 gss_krb5_free_lucid_sec_context(&min_stat, gensec_gssapi_state->lucid);
 110                 gensec_gssapi_state->lucid = NULL;
 111                 return NT_STATUS_INTERNAL_ERROR;
 112         }
 113
 114         return NT_STATUS_OK;
 115 }
 116
 117 static NTSTATUS gensec_gssapi_start(struct gensec_security *gensec_security)
 118 {
 119         struct gensec_gssapi_state *gensec_gssapi_state;
 120         krb5_error_code ret;
 121         const char *realm;
 122
 123         gensec_gssapi_state = talloc_zero(gensec_security, struct gensec_gssapi_state);
 124         if (!gensec_gssapi_state) {
 125                 return NT_STATUS_NO_MEMORY;
 126         }
 127
 128         gensec_security->private_data = gensec_gssapi_state;
 129
 130         gensec_gssapi_state->gssapi_context = GSS_C_NO_CONTEXT;
 131
 132         /* TODO: Fill in channel bindings */
 133         gensec_gssapi_state->input_chan_bindings = GSS_C_NO_CHANNEL_BINDINGS;
 134
 135         gensec_gssapi_state->server_name = GSS_C_NO_NAME;
 136         gensec_gssapi_state->client_name = GSS_C_NO_NAME;
 137
 138         gensec_gssapi_state->gss_want_flags = 0;
 139         gensec_gssapi_state->expire_time = GENSEC_EXPIRE_TIME_INFINITY;
 140
 141         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation_by_kdc_policy", true)) {
 142                 gensec_gssapi_state->gss_want_flags |= GSS_C_DELEG_POLICY_FLAG;
 143         }
 144         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "mutual", true)) {
 145                 gensec_gssapi_state->gss_want_flags |= GSS_C_MUTUAL_FLAG;
 146         }
 147         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation", true)) {
 148                 gensec_gssapi_state->gss_want_flags |= GSS_C_DELEG_FLAG;
 149         }
 150         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "replay", true)) {
 151                 gensec_gssapi_state->gss_want_flags |= GSS_C_REPLAY_FLAG;
 152         }
 153         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "sequence", true)) {
 154                 gensec_gssapi_state->gss_want_flags |= GSS_C_SEQUENCE_FLAG;
 155         }
 156
 157         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 158                 gensec_gssapi_state->gss_want_flags |= GSS_C_INTEG_FLAG;
 159         }
 160         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 161                 gensec_gssapi_state->gss_want_flags |= GSS_C_INTEG_FLAG;
 162                 gensec_gssapi_state->gss_want_flags |= GSS_C_CONF_FLAG;
 163         }
 164         if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
 165                 gensec_gssapi_state->gss_want_flags |= GSS_C_DCE_STYLE;
 166         }
 167
 168         gensec_gssapi_state->gss_got_flags = 0;
 169
 170         switch (gensec_security->ops->auth_type) {
 171         case DCERPC_AUTH_TYPE_SPNEGO:
 172                 gensec_gssapi_state->gss_oid = gss_mech_spnego;
 173                 break;
 174         case DCERPC_AUTH_TYPE_KRB5:
 175         default:
 176                 gensec_gssapi_state->gss_oid =
 177                         discard_const_p(void, gss_mech_krb5);
 178                 break;
 179         }
 180
 181         ret = smb_krb5_init_context(gensec_gssapi_state,
 182                                     NULL,
 183                                     gensec_security->settings->lp_ctx,
 184                                     &gensec_gssapi_state->smb_krb5_context);
 185         if (ret) {
 186                 DEBUG(1,("gensec_gssapi_start: smb_krb5_init_context failed (%s)\n",
 187                          error_message(ret)));
 188                 talloc_free(gensec_gssapi_state);
 189                 return NT_STATUS_INTERNAL_ERROR;
 190         }
 191
 192         gensec_gssapi_state->client_cred = NULL;
 193         gensec_gssapi_state->server_cred = NULL;
 194
 195         gensec_gssapi_state->lucid = NULL;
 196
 197         gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
 198
 199         gensec_gssapi_state->sasl = false;
 200         gensec_gssapi_state->sasl_state = STAGE_GSS_NEG;
 201         gensec_gssapi_state->sasl_protection = 0;
 202
 203         gensec_gssapi_state->max_wrap_buf_size
 204                 = gensec_setting_int(gensec_security->settings, "gensec_gssapi", "max wrap buf size", 65536);
 205         gensec_gssapi_state->gss_exchange_count = 0;
 206         gensec_gssapi_state->sig_size = 0;
 207
 208         talloc_set_destructor(gensec_gssapi_state, gensec_gssapi_destructor);
 209
 210 #ifdef SAMBA4_USES_HEIMDAL
 211         realm = lpcfg_realm(gensec_security->settings->lp_ctx);
 212         if (realm != NULL) {
 213                 ret = gsskrb5_set_default_realm(realm);
 214                 if (ret) {
 215                         DEBUG(1,("gensec_gssapi_start: gsskrb5_set_default_realm failed\n"));
 216                         talloc_free(gensec_gssapi_state);
 217                         return NT_STATUS_INTERNAL_ERROR;
 218                 }
 219         }
 220
 221         /* don't do DNS lookups of any kind, it might/will fail for a netbios name */
 222         ret = gsskrb5_set_dns_canonicalize(gensec_setting_bool(gensec_security->settings, "krb5", "set_dns_canonicalize", false));
 223         if (ret) {
 224                 DEBUG(1,("gensec_gssapi_start: gsskrb5_set_dns_canonicalize failed\n"));
 225                 talloc_free(gensec_gssapi_state);
 226                 return NT_STATUS_INTERNAL_ERROR;
 227         }
 228 #endif
 229         return NT_STATUS_OK;
 230 }
 231
 232 static NTSTATUS gensec_gssapi_server_start(struct gensec_security *gensec_security)
 233 {
 234         NTSTATUS nt_status;
 235         int ret;
 236         struct gensec_gssapi_state *gensec_gssapi_state;
 237         struct cli_credentials *machine_account;
 238         struct gssapi_creds_container *gcc;
 239
 240         nt_status = gensec_gssapi_start(gensec_security);
 241         if (!NT_STATUS_IS_OK(nt_status)) {
 242                 return nt_status;
 243         }
 244
 245         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 246
 247         machine_account = gensec_get_credentials(gensec_security);
 248
 249         if (!machine_account) {
 250                 DEBUG(3, ("No machine account credentials specified\n"));
 251                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 252         } else {
 253                 ret = cli_credentials_get_server_gss_creds(machine_account,
 254                                                            gensec_security->settings->lp_ctx, &gcc);
 255                 if (ret) {
 256                         DEBUG(1, ("Aquiring acceptor credentials failed: %s\n",
 257                                   error_message(ret)));
 258                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 259                 }
 260         }
 261
 262         gensec_gssapi_state->server_cred = gcc;
 263         return NT_STATUS_OK;
 264
 265 }
 266
 267 static NTSTATUS gensec_gssapi_sasl_server_start(struct gensec_security *gensec_security)
 268 {
 269         NTSTATUS nt_status;
 270         struct gensec_gssapi_state *gensec_gssapi_state;
 271         nt_status = gensec_gssapi_server_start(gensec_security);
 272
 273         if (NT_STATUS_IS_OK(nt_status)) {
 274                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 275                 gensec_gssapi_state->sasl = true;
 276         }
 277         return nt_status;
 278 }
 279
 280 static NTSTATUS gensec_gssapi_client_creds(struct gensec_security *gensec_security,
 281                                            struct tevent_context *ev)
 282 {
 283         struct gensec_gssapi_state *gensec_gssapi_state;
 284         struct gssapi_creds_container *gcc;
 285         struct cli_credentials *creds = gensec_get_credentials(gensec_security);
 286         const char *error_string;
 287         int ret;
 288
 289         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 290
 291         /* Only run this the first time the update() call is made */
 292         if (gensec_gssapi_state->client_cred) {
 293                 return NT_STATUS_OK;
 294         }
 295
 296         ret = cli_credentials_get_client_gss_creds(creds,
 297                                                    ev,
 298                                                    gensec_security->settings->lp_ctx, &gcc, &error_string);
 299         switch (ret) {
 300         case 0:
 301                 break;
 302         case EINVAL:
 303                 DEBUG(3, ("Cannot obtain client GSS credentials we need to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
 304                 return NT_STATUS_INVALID_PARAMETER;
 305         case KRB5KDC_ERR_PREAUTH_FAILED:
 306         case KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN:
 307                 DEBUG(1, ("Wrong username or password: %s\n", error_string));
 308                 return NT_STATUS_LOGON_FAILURE;
 309         case KRB5_KDC_UNREACH:
 310                 DEBUG(3, ("Cannot reach a KDC we require to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
 311                 return NT_STATUS_NO_LOGON_SERVERS;
 312         case KRB5_CC_NOTFOUND:
 313         case KRB5_CC_END:
 314                 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));
 315                 return NT_STATUS_TIME_DIFFERENCE_AT_DC;
 316         default:
 317                 DEBUG(1, ("Aquiring initiator credentials failed: %s\n", error_string));
 318                 return NT_STATUS_UNSUCCESSFUL;
 319         }
 320
 321         gensec_gssapi_state->client_cred = gcc;
 322         if (!talloc_reference(gensec_gssapi_state, gcc)) {
 323                 return NT_STATUS_NO_MEMORY;
 324         }
 325
 326         return NT_STATUS_OK;
 327 }
 328
 329 static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_security)
 330 {
 331         struct gensec_gssapi_state *gensec_gssapi_state;
 332         struct cli_credentials *creds = gensec_get_credentials(gensec_security);
 333         NTSTATUS nt_status;
 334         gss_buffer_desc name_token;
 335         gss_OID name_type;
 336         OM_uint32 maj_stat, min_stat;
 337         const char *hostname = gensec_get_target_hostname(gensec_security);
 338
 339         if (!hostname) {
 340                 DEBUG(3, ("No hostname for target computer passed in, cannot use kerberos for this connection\n"));
 341                 return NT_STATUS_INVALID_PARAMETER;
 342         }
 343         if (is_ipaddress(hostname)) {
 344                 DEBUG(2, ("Cannot do GSSAPI to an IP address\n"));
 345                 return NT_STATUS_INVALID_PARAMETER;
 346         }
 347         if (strcmp(hostname, "localhost") == 0) {
 348                 DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
 349                 return NT_STATUS_INVALID_PARAMETER;
 350         }
 351
 352         nt_status = gensec_gssapi_start(gensec_security);
 353         if (!NT_STATUS_IS_OK(nt_status)) {
 354                 return nt_status;
 355         }
 356
 357         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 358
 359         if (cli_credentials_get_impersonate_principal(creds)) {
 360                 gensec_gssapi_state->gss_want_flags &= ~(GSS_C_DELEG_FLAG|GSS_C_DELEG_POLICY_FLAG);
 361         }
 362
 363         gensec_gssapi_state->target_principal = gensec_get_target_principal(gensec_security);
 364         if (gensec_gssapi_state->target_principal) {
 365                 name_type = GSS_C_NULL_OID;
 366         } else {
 367                 gensec_gssapi_state->target_principal = talloc_asprintf(gensec_gssapi_state, "%s/%s@%s",
 368                                             gensec_get_target_service(gensec_security),
 369                                             hostname, lpcfg_realm(gensec_security->settings->lp_ctx));
 370
 371                 name_type = GSS_C_NT_USER_NAME;
 372         }
 373         name_token.value  = discard_const_p(uint8_t, gensec_gssapi_state->target_principal);
 374         name_token.length = strlen(gensec_gssapi_state->target_principal);
 375
 376
 377         maj_stat = gss_import_name (&min_stat,
 378                                     &name_token,
 379                                     name_type,
 380                                     &gensec_gssapi_state->server_name);
 381         if (maj_stat) {
 382                 DEBUG(2, ("GSS Import name of %s failed: %s\n",
 383                           (char *)name_token.value,
 384                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 385                 return NT_STATUS_INVALID_PARAMETER;
 386         }
 387
 388         return NT_STATUS_OK;
 389 }
 390
 391 static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
 392 {
 393         NTSTATUS nt_status;
 394         struct gensec_gssapi_state *gensec_gssapi_state;
 395         nt_status = gensec_gssapi_client_start(gensec_security);
 396
 397         if (NT_STATUS_IS_OK(nt_status)) {
 398                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 399                 gensec_gssapi_state->sasl = true;
 400         }
 401         return nt_status;
 402 }
 403
 404
 405 /**
 406  * Next state function for the GSSAPI GENSEC mechanism
 407  *
 408  * @param gensec_gssapi_state GSSAPI State
 409  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 410  * @param in The request, as a DATA_BLOB
 411  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 412  * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
 413  *                or NT_STATUS_OK if the user is authenticated.
 414  */
 415
 416 static NTSTATUS gensec_gssapi_update(struct gensec_security *gensec_security,
 417                                      TALLOC_CTX *out_mem_ctx,
 418                                      struct tevent_context *ev,
 419                                      const DATA_BLOB in, DATA_BLOB *out)
 420 {
 421         struct gensec_gssapi_state *gensec_gssapi_state
 422                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 423         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 424         OM_uint32 maj_stat, min_stat;
 425         OM_uint32 min_stat2;
 426         gss_buffer_desc input_token, output_token;
 427         gss_OID gss_oid_p = NULL;
 428         OM_uint32 time_req = 0;
 429         OM_uint32 time_rec = 0;
 430         struct timeval tv;
 431
 432         time_req = gensec_setting_int(gensec_security->settings,
 433                                       "gensec_gssapi", "requested_life_time",
 434                                       time_req);
 435
 436         input_token.length = in.length;
 437         input_token.value = in.data;
 438
 439         switch (gensec_gssapi_state->sasl_state) {
 440         case STAGE_GSS_NEG:
 441         {
 442                 switch (gensec_security->gensec_role) {
 443                 case GENSEC_CLIENT:
 444                 {
 445 #ifdef SAMBA4_USES_HEIMDAL
 446                         struct gsskrb5_send_to_kdc send_to_kdc;
 447 #endif
 448                         krb5_error_code ret;
 449
 450                         nt_status = gensec_gssapi_client_creds(gensec_security, ev);
 451                         if (!NT_STATUS_IS_OK(nt_status)) {
 452                                 return nt_status;
 453                         }
 454
 455 #ifdef SAMBA4_USES_HEIMDAL
 456                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 457                         send_to_kdc.ptr = ev;
 458
 459                         min_stat = gsskrb5_set_send_to_kdc(&send_to_kdc);
 460                         if (min_stat) {
 461                                 DEBUG(1,("gensec_gssapi_update: gsskrb5_set_send_to_kdc failed\n"));
 462                                 return NT_STATUS_INTERNAL_ERROR;
 463                         }
 464 #endif
 465                         maj_stat = gss_init_sec_context(&min_stat,
 466                                                         gensec_gssapi_state->client_cred->creds,
 467                                                         &gensec_gssapi_state->gssapi_context,
 468                                                         gensec_gssapi_state->server_name,
 469                                                         gensec_gssapi_state->gss_oid,
 470                                                         gensec_gssapi_state->gss_want_flags,
 471                                                         time_req,
 472                                                         gensec_gssapi_state->input_chan_bindings,
 473                                                         &input_token,
 474                                                         &gss_oid_p,
 475                                                         &output_token,
 476                                                         &gensec_gssapi_state->gss_got_flags, /* ret flags */
 477                                                         &time_rec);
 478                         if (gss_oid_p) {
 479                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 480                         }
 481
 482 #ifdef SAMBA4_USES_HEIMDAL
 483                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 484                         send_to_kdc.ptr = NULL;
 485
 486                         ret = gsskrb5_set_send_to_kdc(&send_to_kdc);
 487                         if (ret) {
 488                                 DEBUG(1,("gensec_gssapi_update: gsskrb5_set_send_to_kdc failed\n"));
 489                                 return NT_STATUS_INTERNAL_ERROR;
 490                         }
 491 #endif
 492                         break;
 493                 }
 494                 case GENSEC_SERVER:
 495                 {
 496                         maj_stat = gss_accept_sec_context(&min_stat,
 497                                                           &gensec_gssapi_state->gssapi_context,
 498                                                           gensec_gssapi_state->server_cred->creds,
 499                                                           &input_token,
 500                                                           gensec_gssapi_state->input_chan_bindings,
 501                                                           &gensec_gssapi_state->client_name,
 502                                                           &gss_oid_p,
 503                                                           &output_token,
 504                                                           &gensec_gssapi_state->gss_got_flags,
 505                                                           &time_rec,
 506                                                           &gensec_gssapi_state->delegated_cred_handle);
 507                         if (gss_oid_p) {
 508                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 509                         }
 510                         break;
 511                 }
 512                 default:
 513                         return NT_STATUS_INVALID_PARAMETER;
 514
 515                 }
 516
 517                 gensec_gssapi_state->gss_exchange_count++;
 518
 519                 if (maj_stat == GSS_S_COMPLETE) {
 520                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 521                         gss_release_buffer(&min_stat2, &output_token);
 522
 523                         if (gensec_gssapi_state->gss_got_flags & GSS_C_DELEG_FLAG) {
 524                                 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
 525                         } else {
 526                                 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
 527                         }
 528
 529                         tv = timeval_current_ofs(time_rec, 0);
 530                         gensec_gssapi_state->expire_time = timeval_to_nttime(&tv);
 531
 532                         /* We may have been invoked as SASL, so there
 533                          * is more work to do */
 534                         if (gensec_gssapi_state->sasl) {
 535                                 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
 536                                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 537                         } else {
 538                                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 539
 540                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 541                                         DEBUG(5, ("GSSAPI Connection will be cryptographically sealed\n"));
 542                                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 543                                         DEBUG(5, ("GSSAPI Connection will be cryptographically signed\n"));
 544                                 } else {
 545                                         DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
 546                                 }
 547
 548                                 return NT_STATUS_OK;
 549                         }
 550                 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
 551                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 552                         gss_release_buffer(&min_stat2, &output_token);
 553
 554                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 555                 } else if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
 556                         gss_cred_id_t creds;
 557                         gss_name_t name;
 558                         gss_buffer_desc buffer;
 559                         OM_uint32 lifetime = 0;
 560                         gss_cred_usage_t usage;
 561                         const char *role = NULL;
 562                         DEBUG(0, ("GSS %s Update(krb5)(%d) Update failed, credentials expired during GSSAPI handshake!\n",
 563                                   role,
 564                                   gensec_gssapi_state->gss_exchange_count));
 565
 566
 567                         switch (gensec_security->gensec_role) {
 568                         case GENSEC_CLIENT:
 569                                 creds = gensec_gssapi_state->client_cred->creds;
 570                                 role = "client";
 571                                 break;
 572                         case GENSEC_SERVER:
 573                                 creds = gensec_gssapi_state->server_cred->creds;
 574                                 role = "server";
 575                                 break;
 576                         }
 577
 578                         maj_stat = gss_inquire_cred(&min_stat,
 579                                                     creds,
 580                                                     &name, &lifetime, &usage, NULL);
 581
 582                         if (maj_stat == GSS_S_COMPLETE) {
 583                                 const char *usage_string;
 584                                 switch (usage) {
 585                                 case GSS_C_BOTH:
 586                                         usage_string = "GSS_C_BOTH";
 587                                         break;
 588                                 case GSS_C_ACCEPT:
 589                                         usage_string = "GSS_C_ACCEPT";
 590                                         break;
 591                                 case GSS_C_INITIATE:
 592                                         usage_string = "GSS_C_INITIATE";
 593                                         break;
 594                                 }
 595                                 maj_stat = gss_display_name(&min_stat, name, &buffer, NULL);
 596                                 if (maj_stat) {
 597                                         buffer.value = NULL;
 598                                         buffer.length = 0;
 599                                 }
 600                                 if (lifetime > 0) {
 601                                         DEBUG(0, ("GSSAPI gss_inquire_cred indicates expiry of %*.*s in %u sec for %s\n",
 602                                                   (int)buffer.length, (int)buffer.length, (char *)buffer.value,
 603                                                   lifetime, usage_string));
 604                                 } else {
 605                                         DEBUG(0, ("GSSAPI gss_inquire_cred indicates %*.*s has already expired for %s\n",
 606                                                   (int)buffer.length, (int)buffer.length, (char *)buffer.value,
 607                                                   usage_string));
 608                                 }
 609                                 gss_release_buffer(&min_stat, &buffer);
 610                                 gss_release_name(&min_stat, &name);
 611                         } else if (maj_stat != GSS_S_COMPLETE) {
 612                                 DEBUG(0, ("inquiry of credential lifefime via GSSAPI gss_inquire_cred failed: %s\n",
 613                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 614                         }
 615                         return NT_STATUS_INVALID_PARAMETER;
 616                 } else if (smb_gss_oid_equal(gensec_gssapi_state->gss_oid,
 617                                              gss_mech_krb5)) {
 618                         switch (min_stat) {
 619                         case KRB5KRB_AP_ERR_TKT_NYV:
 620                                 DEBUG(1, ("Error with ticket to contact %s: possible clock skew between us and the KDC or target server: %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_TIME_DIFFERENCE_AT_DC; /* Make SPNEGO ignore us, we can't go any further here */
 624                         case KRB5KRB_AP_ERR_TKT_EXPIRED:
 625                                 DEBUG(1, ("Error with ticket to contact %s: ticket is expired, possible clock skew between us and the KDC or target server: %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 KRB5_KDC_UNREACH:
 630                                 DEBUG(3, ("Cannot reach a KDC we require in order to obtain a ticetk to %s: %s\n",
 631                                           gensec_gssapi_state->target_principal,
 632                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 633                                 return NT_STATUS_NO_LOGON_SERVERS; /* Make SPNEGO ignore us, we can't go any further here */
 634                         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 635                                 DEBUG(3, ("Server %s is not registered with our KDC: %s\n",
 636                                           gensec_gssapi_state->target_principal,
 637                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 638                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 639                         case KRB5KRB_AP_ERR_MSG_TYPE:
 640                                 /* garbage input, possibly from the auto-mech detection */
 641                                 return NT_STATUS_INVALID_PARAMETER;
 642                         default:
 643                                 DEBUG(1, ("GSS %s Update(krb5)(%d) Update failed: %s\n",
 644                                           gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 645                                           gensec_gssapi_state->gss_exchange_count,
 646                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 647                                 return nt_status;
 648                         }
 649                 } else {
 650                         DEBUG(1, ("GSS %s Update(%d) failed: %s\n",
 651                                   gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 652                                   gensec_gssapi_state->gss_exchange_count,
 653                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 654                         return nt_status;
 655                 }
 656                 break;
 657         }
 658
 659         /* These last two stages are only done if we were invoked as SASL */
 660         case STAGE_SASL_SSF_NEG:
 661         {
 662                 switch (gensec_security->gensec_role) {
 663                 case GENSEC_CLIENT:
 664                 {
 665                         uint8_t maxlength_proposed[4];
 666                         uint8_t maxlength_accepted[4];
 667                         uint8_t security_supported;
 668                         int conf_state;
 669                         gss_qop_t qop_state;
 670                         input_token.length = in.length;
 671                         input_token.value = in.data;
 672
 673                         /* As a client, we have just send a
 674                          * zero-length blob to the server (after the
 675                          * normal GSSAPI exchange), and it has replied
 676                          * with it's SASL negotiation */
 677
 678                         maj_stat = gss_unwrap(&min_stat,
 679                                               gensec_gssapi_state->gssapi_context,
 680                                               &input_token,
 681                                               &output_token,
 682                                               &conf_state,
 683                                               &qop_state);
 684                         if (GSS_ERROR(maj_stat)) {
 685                                 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 686                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 687                                 return NT_STATUS_ACCESS_DENIED;
 688                         }
 689
 690                         if (output_token.length < 4) {
 691                                 return NT_STATUS_INVALID_PARAMETER;
 692                         }
 693
 694                         memcpy(maxlength_proposed, output_token.value, 4);
 695                         gss_release_buffer(&min_stat, &output_token);
 696
 697                         /* first byte is the proposed security */
 698                         security_supported = maxlength_proposed[0];
 699                         maxlength_proposed[0] = '\0';
 700
 701                         /* Rest is the proposed max wrap length */
 702                         gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
 703                                                                      gensec_gssapi_state->max_wrap_buf_size);
 704                         gensec_gssapi_state->sasl_protection = 0;
 705                         if (security_supported & NEG_SEAL) {
 706                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 707                                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 708                                 }
 709                         }
 710                         if (security_supported & NEG_SIGN) {
 711                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 712                                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 713                                 }
 714                         }
 715                         if (security_supported & NEG_NONE) {
 716                                 gensec_gssapi_state->sasl_protection |= NEG_NONE;
 717                         }
 718                         if (gensec_gssapi_state->sasl_protection == 0) {
 719                                 DEBUG(1, ("Remote server does not support unprotected connections\n"));
 720                                 return NT_STATUS_ACCESS_DENIED;
 721                         }
 722
 723                         /* Send back the negotiated max length */
 724
 725                         RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
 726
 727                         maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
 728
 729                         input_token.value = maxlength_accepted;
 730                         input_token.length = sizeof(maxlength_accepted);
 731
 732                         maj_stat = gss_wrap(&min_stat,
 733                                             gensec_gssapi_state->gssapi_context,
 734                                             false,
 735                                             GSS_C_QOP_DEFAULT,
 736                                             &input_token,
 737                                             &conf_state,
 738                                             &output_token);
 739                         if (GSS_ERROR(maj_stat)) {
 740                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 741                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 742                                 return NT_STATUS_ACCESS_DENIED;
 743                         }
 744
 745                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 746                         gss_release_buffer(&min_stat, &output_token);
 747
 748                         /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 749                         gensec_gssapi_state->sasl_state = STAGE_DONE;
 750
 751                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 752                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically sealed\n"));
 753                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 754                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically signed\n"));
 755                         } else {
 756                                 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographically protection\n"));
 757                         }
 758
 759                         return NT_STATUS_OK;
 760                 }
 761                 case GENSEC_SERVER:
 762                 {
 763                         uint8_t maxlength_proposed[4];
 764                         uint8_t security_supported = 0x0;
 765                         int conf_state;
 766
 767                         /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
 768                         if (in.length != 0) {
 769                                 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
 770                         }
 771
 772                         /* Give the client some idea what we will support */
 773
 774                         RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
 775                         /* first byte is the proposed security */
 776                         maxlength_proposed[0] = '\0';
 777
 778                         gensec_gssapi_state->sasl_protection = 0;
 779                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 780                                 security_supported |= NEG_SEAL;
 781                         }
 782                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 783                                 security_supported |= NEG_SIGN;
 784                         }
 785                         if (security_supported == 0) {
 786                                 /* If we don't support anything, this must be 0 */
 787                                 RSIVAL(maxlength_proposed, 0, 0x0);
 788                         }
 789
 790                         /* TODO:  We may not wish to support this */
 791                         security_supported |= NEG_NONE;
 792                         maxlength_proposed[0] = security_supported;
 793
 794                         input_token.value = maxlength_proposed;
 795                         input_token.length = sizeof(maxlength_proposed);
 796
 797                         maj_stat = gss_wrap(&min_stat,
 798                                             gensec_gssapi_state->gssapi_context,
 799                                             false,
 800                                             GSS_C_QOP_DEFAULT,
 801                                             &input_token,
 802                                             &conf_state,
 803                                             &output_token);
 804                         if (GSS_ERROR(maj_stat)) {
 805                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 806                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 807                                 return NT_STATUS_ACCESS_DENIED;
 808                         }
 809
 810                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 811                         gss_release_buffer(&min_stat, &output_token);
 812
 813                         gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
 814                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 815                 }
 816                 default:
 817                         return NT_STATUS_INVALID_PARAMETER;
 818
 819                 }
 820         }
 821         /* This is s server-only stage */
 822         case STAGE_SASL_SSF_ACCEPT:
 823         {
 824                 uint8_t maxlength_accepted[4];
 825                 uint8_t security_accepted;
 826                 int conf_state;
 827                 gss_qop_t qop_state;
 828                 input_token.length = in.length;
 829                 input_token.value = in.data;
 830
 831                 maj_stat = gss_unwrap(&min_stat,
 832                                       gensec_gssapi_state->gssapi_context,
 833                                       &input_token,
 834                                       &output_token,
 835                                       &conf_state,
 836                                       &qop_state);
 837                 if (GSS_ERROR(maj_stat)) {
 838                         DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 839                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 840                         return NT_STATUS_ACCESS_DENIED;
 841                 }
 842
 843                 if (output_token.length < 4) {
 844                         return NT_STATUS_INVALID_PARAMETER;
 845                 }
 846
 847                 memcpy(maxlength_accepted, output_token.value, 4);
 848                 gss_release_buffer(&min_stat, &output_token);
 849
 850                 /* first byte is the proposed security */
 851                 security_accepted = maxlength_accepted[0];
 852                 maxlength_accepted[0] = '\0';
 853
 854                 /* Rest is the proposed max wrap length */
 855                 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
 856                                                              gensec_gssapi_state->max_wrap_buf_size);
 857
 858                 gensec_gssapi_state->sasl_protection = 0;
 859                 if (security_accepted & NEG_SEAL) {
 860                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 861                                 DEBUG(1, ("Remote client wanted seal, but gensec refused\n"));
 862                                 return NT_STATUS_ACCESS_DENIED;
 863                         }
 864                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 865                 }
 866                 if (security_accepted & NEG_SIGN) {
 867                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 868                                 DEBUG(1, ("Remote client wanted sign, but gensec refused\n"));
 869                                 return NT_STATUS_ACCESS_DENIED;
 870                         }
 871                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 872                 }
 873                 if (security_accepted & NEG_NONE) {
 874                         gensec_gssapi_state->sasl_protection |= NEG_NONE;
 875                 }
 876
 877                 /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 878                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 879                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 880                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically sealed\n"));
 881                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 882                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically signed\n"));
 883                 } else {
 884                         DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
 885                 }
 886
 887                 *out = data_blob(NULL, 0);
 888                 return NT_STATUS_OK;
 889         }
 890         default:
 891                 return NT_STATUS_INVALID_PARAMETER;
 892         }
 893 }
 894
 895 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
 896                                    TALLOC_CTX *mem_ctx,
 897                                    const DATA_BLOB *in,
 898                                    DATA_BLOB *out)
 899 {
 900         struct gensec_gssapi_state *gensec_gssapi_state
 901                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 902         OM_uint32 maj_stat, min_stat;
 903         gss_buffer_desc input_token, output_token;
 904         int conf_state;
 905         input_token.length = in->length;
 906         input_token.value = in->data;
 907
 908         maj_stat = gss_wrap(&min_stat,
 909                             gensec_gssapi_state->gssapi_context,
 910                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 911                             GSS_C_QOP_DEFAULT,
 912                             &input_token,
 913                             &conf_state,
 914                             &output_token);
 915         if (GSS_ERROR(maj_stat)) {
 916                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 917                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 918                 return NT_STATUS_ACCESS_DENIED;
 919         }
 920
 921         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 922         gss_release_buffer(&min_stat, &output_token);
 923
 924         if (gensec_gssapi_state->sasl) {
 925                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 926                 if (max_wrapped_size < out->length) {
 927                         DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
 928                                   (unsigned)in->length,
 929                                   (unsigned)out->length,
 930                                   (unsigned int)max_wrapped_size));
 931                         return NT_STATUS_INVALID_PARAMETER;
 932                 }
 933         }
 934
 935         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 936             && !conf_state) {
 937                 return NT_STATUS_ACCESS_DENIED;
 938         }
 939         return NT_STATUS_OK;
 940 }
 941
 942 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
 943                                      TALLOC_CTX *mem_ctx,
 944                                      const DATA_BLOB *in,
 945                                      DATA_BLOB *out)
 946 {
 947         struct gensec_gssapi_state *gensec_gssapi_state
 948                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 949         OM_uint32 maj_stat, min_stat;
 950         gss_buffer_desc input_token, output_token;
 951         int conf_state;
 952         gss_qop_t qop_state;
 953         input_token.length = in->length;
 954         input_token.value = in->data;
 955
 956         if (gensec_gssapi_state->sasl) {
 957                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 958                 if (max_wrapped_size < in->length) {
 959                         DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
 960                         return NT_STATUS_INVALID_PARAMETER;
 961                 }
 962         }
 963
 964         maj_stat = gss_unwrap(&min_stat,
 965                               gensec_gssapi_state->gssapi_context,
 966                               &input_token,
 967                               &output_token,
 968                               &conf_state,
 969                               &qop_state);
 970         if (GSS_ERROR(maj_stat)) {
 971                 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
 972                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 973                 return NT_STATUS_ACCESS_DENIED;
 974         }
 975
 976         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 977         gss_release_buffer(&min_stat, &output_token);
 978
 979         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 980             && !conf_state) {
 981                 return NT_STATUS_ACCESS_DENIED;
 982         }
 983         return NT_STATUS_OK;
 984 }
 985
 986 /* Find out the maximum input size negotiated on this connection */
 987
 988 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
 989 {
 990         struct gensec_gssapi_state *gensec_gssapi_state
 991                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 992         OM_uint32 maj_stat, min_stat;
 993         OM_uint32 max_input_size;
 994
 995         maj_stat = gss_wrap_size_limit(&min_stat,
 996                                        gensec_gssapi_state->gssapi_context,
 997                                        gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 998                                        GSS_C_QOP_DEFAULT,
 999                                        gensec_gssapi_state->max_wrap_buf_size,
1000                                        &max_input_size);
1001         if (GSS_ERROR(maj_stat)) {
1002                 TALLOC_CTX *mem_ctx = talloc_new(NULL);
1003                 DEBUG(1, ("gensec_gssapi_max_input_size: determining signature size with gss_wrap_size_limit failed: %s\n",
1004                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1005                 talloc_free(mem_ctx);
1006                 return 0;
1007         }
1008
1009         return max_input_size;
1010 }
1011
1012 /* Find out the maximum output size negotiated on this connection */
1013 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
1014 {
1015         struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
1016         return gensec_gssapi_state->max_wrap_buf_size;
1017 }
1018
1019 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
1020                                           TALLOC_CTX *mem_ctx,
1021                                           uint8_t *data, size_t length,
1022                                           const uint8_t *whole_pdu, size_t pdu_length,
1023                                           DATA_BLOB *sig)
1024 {
1025         struct gensec_gssapi_state *gensec_gssapi_state
1026                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1027         OM_uint32 maj_stat, min_stat;
1028         gss_buffer_desc input_token, output_token;
1029         int conf_state;
1030         ssize_t sig_length;
1031
1032         input_token.length = length;
1033         input_token.value = data;
1034
1035         maj_stat = gss_wrap(&min_stat,
1036                             gensec_gssapi_state->gssapi_context,
1037                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
1038                             GSS_C_QOP_DEFAULT,
1039                             &input_token,
1040                             &conf_state,
1041                             &output_token);
1042         if (GSS_ERROR(maj_stat)) {
1043                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
1044                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1045                 return NT_STATUS_ACCESS_DENIED;
1046         }
1047
1048         if (output_token.length < input_token.length) {
1049                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
1050                           (long)output_token.length, (long)length));
1051                 return NT_STATUS_INTERNAL_ERROR;
1052         }
1053         sig_length = output_token.length - input_token.length;
1054
1055         memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
1056         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
1057
1058         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1059         dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
1060         dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
1061
1062         gss_release_buffer(&min_stat, &output_token);
1063
1064         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1065             && !conf_state) {
1066                 return NT_STATUS_ACCESS_DENIED;
1067         }
1068         return NT_STATUS_OK;
1069 }
1070
1071 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
1072                                             uint8_t *data, size_t length,
1073                                             const uint8_t *whole_pdu, size_t pdu_length,
1074                                             const DATA_BLOB *sig)
1075 {
1076         struct gensec_gssapi_state *gensec_gssapi_state
1077                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1078         OM_uint32 maj_stat, min_stat;
1079         gss_buffer_desc input_token, output_token;
1080         int conf_state;
1081         gss_qop_t qop_state;
1082         DATA_BLOB in;
1083
1084         dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
1085
1086         in = data_blob_talloc(gensec_security, NULL, sig->length + length);
1087
1088         memcpy(in.data, sig->data, sig->length);
1089         memcpy(in.data + sig->length, data, length);
1090
1091         input_token.length = in.length;
1092         input_token.value = in.data;
1093
1094         maj_stat = gss_unwrap(&min_stat,
1095                               gensec_gssapi_state->gssapi_context,
1096                               &input_token,
1097                               &output_token,
1098                               &conf_state,
1099                               &qop_state);
1100         talloc_free(in.data);
1101         if (GSS_ERROR(maj_stat)) {
1102                 char *error_string = gssapi_error_string(NULL, maj_stat, min_stat, gensec_gssapi_state->gss_oid);
1103                 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
1104                           error_string));
1105                 talloc_free(error_string);
1106                 return NT_STATUS_ACCESS_DENIED;
1107         }
1108
1109         if (output_token.length != length) {
1110                 return NT_STATUS_INTERNAL_ERROR;
1111         }
1112
1113         memcpy(data, output_token.value, length);
1114
1115         gss_release_buffer(&min_stat, &output_token);
1116
1117         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1118             && !conf_state) {
1119                 return NT_STATUS_ACCESS_DENIED;
1120         }
1121         return NT_STATUS_OK;
1122 }
1123
1124 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1125                                           TALLOC_CTX *mem_ctx,
1126                                           const uint8_t *data, size_t length,
1127                                           const uint8_t *whole_pdu, size_t pdu_length,
1128                                           DATA_BLOB *sig)
1129 {
1130         struct gensec_gssapi_state *gensec_gssapi_state
1131                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1132         OM_uint32 maj_stat, min_stat;
1133         gss_buffer_desc input_token, output_token;
1134
1135         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1136                 input_token.length = pdu_length;
1137                 input_token.value = discard_const_p(uint8_t *, whole_pdu);
1138         } else {
1139                 input_token.length = length;
1140                 input_token.value = discard_const_p(uint8_t *, data);
1141         }
1142
1143         maj_stat = gss_get_mic(&min_stat,
1144                             gensec_gssapi_state->gssapi_context,
1145                             GSS_C_QOP_DEFAULT,
1146                             &input_token,
1147                             &output_token);
1148         if (GSS_ERROR(maj_stat)) {
1149                 DEBUG(1, ("GSS GetMic failed: %s\n",
1150                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1151                 return NT_STATUS_ACCESS_DENIED;
1152         }
1153
1154         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, output_token.length);
1155
1156         dump_data_pw("gensec_gssapi_sign_packet: sig\n", sig->data, sig->length);
1157
1158         gss_release_buffer(&min_stat, &output_token);
1159
1160         return NT_STATUS_OK;
1161 }
1162
1163 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1164                                            const uint8_t *data, size_t length,
1165                                            const uint8_t *whole_pdu, size_t pdu_length,
1166                                            const DATA_BLOB *sig)
1167 {
1168         struct gensec_gssapi_state *gensec_gssapi_state
1169                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1170         OM_uint32 maj_stat, min_stat;
1171         gss_buffer_desc input_token;
1172         gss_buffer_desc input_message;
1173         gss_qop_t qop_state;
1174
1175         dump_data_pw("gensec_gssapi_check_packet: sig\n", sig->data, sig->length);
1176
1177         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1178                 input_message.length = pdu_length;
1179                 input_message.value = discard_const(whole_pdu);
1180         } else {
1181                 input_message.length = length;
1182                 input_message.value = discard_const(data);
1183         }
1184
1185         input_token.length = sig->length;
1186         input_token.value = sig->data;
1187
1188         maj_stat = gss_verify_mic(&min_stat,
1189                               gensec_gssapi_state->gssapi_context,
1190                               &input_message,
1191                               &input_token,
1192                               &qop_state);
1193         if (GSS_ERROR(maj_stat)) {
1194                 char *error_string = gssapi_error_string(NULL, maj_stat, min_stat, gensec_gssapi_state->gss_oid);
1195                 DEBUG(1, ("GSS VerifyMic failed: %s\n", error_string));
1196                 talloc_free(error_string);
1197
1198                 return NT_STATUS_ACCESS_DENIED;
1199         }
1200
1201         return NT_STATUS_OK;
1202 }
1203
1204 /* Try to figure out what features we actually got on the connection */
1205 static bool gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1206                                        uint32_t feature)
1207 {
1208         struct gensec_gssapi_state *gensec_gssapi_state
1209                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1210         if (feature & GENSEC_FEATURE_SIGN) {
1211                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1212                 if (gensec_gssapi_state->sasl
1213                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1214                         return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1215                                 && (gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG));
1216                 }
1217                 return gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG;
1218         }
1219         if (feature & GENSEC_FEATURE_SEAL) {
1220                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1221                 if (gensec_gssapi_state->sasl
1222                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1223                         return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1224                                  && (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG));
1225                 }
1226                 return gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG;
1227         }
1228         if (feature & GENSEC_FEATURE_SESSION_KEY) {
1229                 /* Only for GSSAPI/Krb5 */
1230                 if (smb_gss_oid_equal(gensec_gssapi_state->gss_oid,
1231                                       gss_mech_krb5)) {
1232                         return true;
1233                 }
1234         }
1235         if (feature & GENSEC_FEATURE_DCE_STYLE) {
1236                 return gensec_gssapi_state->gss_got_flags & GSS_C_DCE_STYLE;
1237         }
1238         if (feature & GENSEC_FEATURE_NEW_SPNEGO) {
1239                 NTSTATUS status;
1240                 uint32_t keytype;
1241
1242                 if (!(gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG)) {
1243                         return false;
1244                 }
1245
1246                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "force_new_spnego", false)) {
1247                         return true;
1248                 }
1249                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "disable_new_spnego", false)) {
1250                         return false;
1251                 }
1252
1253                 status = gssapi_get_session_key(gensec_gssapi_state,
1254                                                 gensec_gssapi_state->gssapi_context, NULL, &keytype);
1255                 /*
1256                  * We should do a proper sig on the mechListMic unless
1257                  * we know we have to be backwards compatible with
1258                  * earlier windows versions.
1259                  *
1260                  * Negotiating a non-krb5
1261                  * mech for example should be regarded as having
1262                  * NEW_SPNEGO
1263                  */
1264                 if (NT_STATUS_IS_OK(status)) {
1265                         switch (keytype) {
1266                         case ENCTYPE_DES_CBC_CRC:
1267                         case ENCTYPE_DES_CBC_MD5:
1268                         case ENCTYPE_ARCFOUR_HMAC:
1269                         case ENCTYPE_DES3_CBC_SHA1:
1270                                 return false;
1271                         }
1272                 }
1273                 return true;
1274         }
1275         /* We can always do async (rather than strict request/reply) packets.  */
1276         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1277                 return true;
1278         }
1279         return false;
1280 }
1281
1282 static NTTIME gensec_gssapi_expire_time(struct gensec_security *gensec_security)
1283 {
1284         struct gensec_gssapi_state *gensec_gssapi_state =
1285                 talloc_get_type_abort(gensec_security->private_data,
1286                 struct gensec_gssapi_state);
1287
1288         return gensec_gssapi_state->expire_time;
1289 }
1290
1291 /*
1292  * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1293  * (for encrypting some passwords).
1294  *
1295  * This breaks all the abstractions, but what do you expect...
1296  */
1297 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1298                                           TALLOC_CTX *mem_ctx,
1299                                           DATA_BLOB *session_key)
1300 {
1301         struct gensec_gssapi_state *gensec_gssapi_state
1302                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1303         return gssapi_get_session_key(mem_ctx, gensec_gssapi_state->gssapi_context, session_key, NULL);
1304 }
1305
1306 /* Get some basic (and authorization) information about the user on
1307  * this session.  This uses either the PAC (if present) or a local
1308  * database lookup */
1309 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1310                                            TALLOC_CTX *mem_ctx,
1311                                            struct auth_session_info **_session_info)
1312 {
1313         NTSTATUS nt_status;
1314         TALLOC_CTX *tmp_ctx;
1315         struct gensec_gssapi_state *gensec_gssapi_state
1316                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1317         struct auth_session_info *session_info = NULL;
1318         OM_uint32 maj_stat, min_stat;
1319         DATA_BLOB pac_blob, *pac_blob_ptr = NULL;
1320
1321         gss_buffer_desc name_token;
1322         char *principal_string;
1323
1324         tmp_ctx = talloc_named(mem_ctx, 0, "gensec_gssapi_session_info context");
1325         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
1326
1327         maj_stat = gss_display_name (&min_stat,
1328                                      gensec_gssapi_state->client_name,
1329                                      &name_token,
1330                                      NULL);
1331         if (GSS_ERROR(maj_stat)) {
1332                 DEBUG(1, ("GSS display_name failed: %s\n",
1333                           gssapi_error_string(tmp_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1334                 talloc_free(tmp_ctx);
1335                 return NT_STATUS_FOOBAR;
1336         }
1337
1338         principal_string = talloc_strndup(tmp_ctx,
1339                                           (const char *)name_token.value,
1340                                           name_token.length);
1341
1342         gss_release_buffer(&min_stat, &name_token);
1343
1344         if (!principal_string) {
1345                 talloc_free(tmp_ctx);
1346                 return NT_STATUS_NO_MEMORY;
1347         }
1348
1349         nt_status = gssapi_obtain_pac_blob(tmp_ctx,  gensec_gssapi_state->gssapi_context,
1350                                            gensec_gssapi_state->client_name,
1351                                            &pac_blob);
1352
1353         /* IF we have the PAC - otherwise we need to get this
1354          * data from elsewere - local ldb, or (TODO) lookup of some
1355          * kind...
1356          */
1357         if (NT_STATUS_IS_OK(nt_status)) {
1358                 pac_blob_ptr = &pac_blob;
1359         }
1360         nt_status = gensec_generate_session_info_pac(tmp_ctx,
1361                                                      gensec_security,
1362                                                      gensec_gssapi_state->smb_krb5_context,
1363                                                      pac_blob_ptr, principal_string,
1364                                                      gensec_get_remote_address(gensec_security),
1365                                                      &session_info);
1366         if (!NT_STATUS_IS_OK(nt_status)) {
1367                 talloc_free(tmp_ctx);
1368                 return nt_status;
1369         }
1370
1371         nt_status = gensec_gssapi_session_key(gensec_security, session_info, &session_info->session_key);
1372         if (!NT_STATUS_IS_OK(nt_status)) {
1373                 talloc_free(tmp_ctx);
1374                 return nt_status;
1375         }
1376
1377         if (!(gensec_gssapi_state->gss_got_flags & GSS_C_DELEG_FLAG)) {
1378                 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1379         } else {
1380                 krb5_error_code ret;
1381                 const char *error_string;
1382
1383                 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1384                 session_info->credentials = cli_credentials_init(session_info);
1385                 if (!session_info->credentials) {
1386                         talloc_free(tmp_ctx);
1387                         return NT_STATUS_NO_MEMORY;
1388                 }
1389
1390                 cli_credentials_set_conf(session_info->credentials, gensec_security->settings->lp_ctx);
1391                 /* Just so we don't segfault trying to get at a username */
1392                 cli_credentials_set_anonymous(session_info->credentials);
1393
1394                 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1395                                                            gensec_security->settings->lp_ctx,
1396                                                            gensec_gssapi_state->delegated_cred_handle,
1397                                                            CRED_SPECIFIED, &error_string);
1398                 if (ret) {
1399                         talloc_free(tmp_ctx);
1400                         DEBUG(2,("Failed to get gss creds: %s\n", error_string));
1401                         return NT_STATUS_NO_MEMORY;
1402                 }
1403
1404                 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1405                 cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
1406
1407                 /* It has been taken from this place... */
1408                 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1409         }
1410         *_session_info = talloc_steal(mem_ctx, session_info);
1411         talloc_free(tmp_ctx);
1412
1413         return NT_STATUS_OK;
1414 }
1415
1416 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
1417 {
1418         struct gensec_gssapi_state *gensec_gssapi_state
1419                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1420         NTSTATUS status;
1421
1422         if (gensec_gssapi_state->sig_size) {
1423                 return gensec_gssapi_state->sig_size;
1424         }
1425
1426         if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1427                 gensec_gssapi_state->sig_size = 45;
1428         } else {
1429                 gensec_gssapi_state->sig_size = 37;
1430         }
1431
1432         status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1433         if (!NT_STATUS_IS_OK(status)) {
1434                 return gensec_gssapi_state->sig_size;
1435         }
1436
1437         if (gensec_gssapi_state->lucid->protocol == 1) {
1438                 if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1439                         /*
1440                          * TODO: windows uses 76 here, but we don't know
1441                          *       gss_wrap works with aes keys yet
1442                          */
1443                         gensec_gssapi_state->sig_size = 76;
1444                 } else {
1445                         gensec_gssapi_state->sig_size = 28;
1446                 }
1447         } else if (gensec_gssapi_state->lucid->protocol == 0) {
1448                 switch (gensec_gssapi_state->lucid->rfc1964_kd.ctx_key.type) {
1449                 case ENCTYPE_DES_CBC_CRC:
1450                 case ENCTYPE_ARCFOUR_HMAC:
1451                 case ENCTYPE_ARCFOUR_HMAC_EXP:
1452                         if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1453                                 gensec_gssapi_state->sig_size = 45;
1454                         } else {
1455                                 gensec_gssapi_state->sig_size = 37;
1456                         }
1457                         break;
1458 #ifdef SAMBA4_USES_HEIMDAL
1459                 case ENCTYPE_OLD_DES3_CBC_SHA1:
1460                         if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1461                                 gensec_gssapi_state->sig_size = 57;
1462                         } else {
1463                                 gensec_gssapi_state->sig_size = 49;
1464                         }
1465                         break;
1466 #endif
1467                 }
1468         }
1469
1470         return gensec_gssapi_state->sig_size;
1471 }
1472
1473 static const char *gensec_gssapi_krb5_oids[] = {
1474         GENSEC_OID_KERBEROS5_OLD,
1475         GENSEC_OID_KERBEROS5,
1476         NULL
1477 };
1478
1479 static const char *gensec_gssapi_spnego_oids[] = {
1480         GENSEC_OID_SPNEGO,
1481         NULL
1482 };
1483
1484 /* As a server, this could in theory accept any GSSAPI mech */
1485 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1486         .name           = "gssapi_spnego",
1487         .sasl_name      = "GSS-SPNEGO",
1488         .auth_type      = DCERPC_AUTH_TYPE_SPNEGO,
1489         .oid            = gensec_gssapi_spnego_oids,
1490         .client_start   = gensec_gssapi_client_start,
1491         .server_start   = gensec_gssapi_server_start,
1492         .magic          = gensec_magic_check_krb5_oid,
1493         .update         = gensec_gssapi_update,
1494         .session_key    = gensec_gssapi_session_key,
1495         .session_info   = gensec_gssapi_session_info,
1496         .sign_packet    = gensec_gssapi_sign_packet,
1497         .check_packet   = gensec_gssapi_check_packet,
1498         .seal_packet    = gensec_gssapi_seal_packet,
1499         .unseal_packet  = gensec_gssapi_unseal_packet,
1500         .wrap           = gensec_gssapi_wrap,
1501         .unwrap         = gensec_gssapi_unwrap,
1502         .have_feature   = gensec_gssapi_have_feature,
1503         .expire_time    = gensec_gssapi_expire_time,
1504         .enabled        = false,
1505         .kerberos       = true,
1506         .priority       = GENSEC_GSSAPI
1507 };
1508
1509 /* As a server, this could in theory accept any GSSAPI mech */
1510 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1511         .name           = "gssapi_krb5",
1512         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
1513         .oid            = gensec_gssapi_krb5_oids,
1514         .client_start   = gensec_gssapi_client_start,
1515         .server_start   = gensec_gssapi_server_start,
1516         .magic          = gensec_magic_check_krb5_oid,
1517         .update         = gensec_gssapi_update,
1518         .session_key    = gensec_gssapi_session_key,
1519         .session_info   = gensec_gssapi_session_info,
1520         .sig_size       = gensec_gssapi_sig_size,
1521         .sign_packet    = gensec_gssapi_sign_packet,
1522         .check_packet   = gensec_gssapi_check_packet,
1523         .seal_packet    = gensec_gssapi_seal_packet,
1524         .unseal_packet  = gensec_gssapi_unseal_packet,
1525         .wrap           = gensec_gssapi_wrap,
1526         .unwrap         = gensec_gssapi_unwrap,
1527         .have_feature   = gensec_gssapi_have_feature,
1528         .expire_time    = gensec_gssapi_expire_time,
1529         .enabled        = true,
1530         .kerberos       = true,
1531         .priority       = GENSEC_GSSAPI
1532 };
1533
1534 /* As a server, this could in theory accept any GSSAPI mech */
1535 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1536         .name             = "gssapi_krb5_sasl",
1537         .sasl_name        = "GSSAPI",
1538         .client_start     = gensec_gssapi_sasl_client_start,
1539         .server_start     = gensec_gssapi_sasl_server_start,
1540         .update           = gensec_gssapi_update,
1541         .session_key      = gensec_gssapi_session_key,
1542         .session_info     = gensec_gssapi_session_info,
1543         .max_input_size   = gensec_gssapi_max_input_size,
1544         .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1545         .wrap             = gensec_gssapi_wrap,
1546         .unwrap           = gensec_gssapi_unwrap,
1547         .have_feature     = gensec_gssapi_have_feature,
1548         .expire_time      = gensec_gssapi_expire_time,
1549         .enabled          = true,
1550         .kerberos         = true,
1551         .priority         = GENSEC_GSSAPI
1552 };
1553
1554 _PUBLIC_ NTSTATUS gensec_gssapi_init(void)
1555 {
1556         NTSTATUS ret;
1557
1558         ret = gensec_register(&gensec_gssapi_spnego_security_ops);
1559         if (!NT_STATUS_IS_OK(ret)) {
1560                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1561                         gensec_gssapi_spnego_security_ops.name));
1562                 return ret;
1563         }
1564
1565         ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1566         if (!NT_STATUS_IS_OK(ret)) {
1567                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1568                         gensec_gssapi_krb5_security_ops.name));
1569                 return ret;
1570         }
1571
1572         ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1573         if (!NT_STATUS_IS_OK(ret)) {
1574                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1575                         gensec_gssapi_sasl_krb5_security_ops.name));
1576                 return ret;
1577         }
1578
1579         return ret;
1580 }