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 #ifndef gss_mech_spnego
  46 gss_OID_desc spnego_mech_oid_desc =
  47                 { 6, discard_const_p(void, "\x2b\x06\x01\x05\x05\x02") };
  48 #define gss_mech_spnego (&spnego_mech_oid_desc)
  49 #endif
  50
  51 _PUBLIC_ NTSTATUS gensec_gssapi_init(void);
  52
  53 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security);
  54 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security);
  55
  56 static int gensec_gssapi_destructor(struct gensec_gssapi_state *gensec_gssapi_state)
  57 {
  58         OM_uint32 maj_stat, min_stat;
  59
  60         if (gensec_gssapi_state->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
  61                 maj_stat = gss_release_cred(&min_stat,
  62                                             &gensec_gssapi_state->delegated_cred_handle);
  63         }
  64
  65         if (gensec_gssapi_state->gssapi_context != GSS_C_NO_CONTEXT) {
  66                 maj_stat = gss_delete_sec_context (&min_stat,
  67                                                    &gensec_gssapi_state->gssapi_context,
  68                                                    GSS_C_NO_BUFFER);
  69         }
  70
  71         if (gensec_gssapi_state->server_name != GSS_C_NO_NAME) {
  72                 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->server_name);
  73         }
  74         if (gensec_gssapi_state->client_name != GSS_C_NO_NAME) {
  75                 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->client_name);
  76         }
  77
  78         if (gensec_gssapi_state->lucid) {
  79                 gss_krb5_free_lucid_sec_context(&min_stat, gensec_gssapi_state->lucid);
  80         }
  81
  82         return 0;
  83 }
  84
  85 static NTSTATUS gensec_gssapi_init_lucid(struct gensec_gssapi_state *gensec_gssapi_state)
  86 {
  87         OM_uint32 maj_stat, min_stat;
  88
  89         if (gensec_gssapi_state->lucid) {
  90                 return NT_STATUS_OK;
  91         }
  92
  93         maj_stat = gss_krb5_export_lucid_sec_context(&min_stat,
  94                                                      &gensec_gssapi_state->gssapi_context,
  95                                                      1,
  96                                                      (void **)&gensec_gssapi_state->lucid);
  97         if (maj_stat != GSS_S_COMPLETE) {
  98                 DEBUG(0,("gensec_gssapi_init_lucid: %s\n",
  99                         gssapi_error_string(gensec_gssapi_state,
 100                                             maj_stat, min_stat,
 101                                             gensec_gssapi_state->gss_oid)));
 102                 return NT_STATUS_INTERNAL_ERROR;
 103         }
 104
 105         if (gensec_gssapi_state->lucid->version != 1) {
 106                 DEBUG(0,("gensec_gssapi_init_lucid: lucid version[%d] != 1\n",
 107                         gensec_gssapi_state->lucid->version));
 108                 gss_krb5_free_lucid_sec_context(&min_stat, gensec_gssapi_state->lucid);
 109                 gensec_gssapi_state->lucid = NULL;
 110                 return NT_STATUS_INTERNAL_ERROR;
 111         }
 112
 113         return NT_STATUS_OK;
 114 }
 115
 116 static NTSTATUS gensec_gssapi_start(struct gensec_security *gensec_security)
 117 {
 118         struct gensec_gssapi_state *gensec_gssapi_state;
 119         krb5_error_code ret;
 120         const char *realm;
 121
 122         gensec_gssapi_state = talloc_zero(gensec_security, struct gensec_gssapi_state);
 123         if (!gensec_gssapi_state) {
 124                 return NT_STATUS_NO_MEMORY;
 125         }
 126
 127         gensec_security->private_data = gensec_gssapi_state;
 128
 129         gensec_gssapi_state->gssapi_context = GSS_C_NO_CONTEXT;
 130
 131         /* TODO: Fill in channel bindings */
 132         gensec_gssapi_state->input_chan_bindings = GSS_C_NO_CHANNEL_BINDINGS;
 133
 134         gensec_gssapi_state->server_name = GSS_C_NO_NAME;
 135         gensec_gssapi_state->client_name = GSS_C_NO_NAME;
 136
 137         gensec_gssapi_state->gss_want_flags = 0;
 138         gensec_gssapi_state->expire_time = GENSEC_EXPIRE_TIME_INFINITY;
 139
 140         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation_by_kdc_policy", true)) {
 141                 gensec_gssapi_state->gss_want_flags |= GSS_C_DELEG_POLICY_FLAG;
 142         }
 143         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "mutual", true)) {
 144                 gensec_gssapi_state->gss_want_flags |= GSS_C_MUTUAL_FLAG;
 145         }
 146         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation", true)) {
 147                 gensec_gssapi_state->gss_want_flags |= GSS_C_DELEG_FLAG;
 148         }
 149         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "replay", true)) {
 150                 gensec_gssapi_state->gss_want_flags |= GSS_C_REPLAY_FLAG;
 151         }
 152         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "sequence", true)) {
 153                 gensec_gssapi_state->gss_want_flags |= GSS_C_SEQUENCE_FLAG;
 154         }
 155
 156         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 157                 gensec_gssapi_state->gss_want_flags |= GSS_C_INTEG_FLAG;
 158         }
 159         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 160                 gensec_gssapi_state->gss_want_flags |= GSS_C_INTEG_FLAG;
 161                 gensec_gssapi_state->gss_want_flags |= GSS_C_CONF_FLAG;
 162         }
 163         if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
 164                 gensec_gssapi_state->gss_want_flags |= GSS_C_DCE_STYLE;
 165         }
 166
 167         gensec_gssapi_state->gss_got_flags = 0;
 168
 169         switch (gensec_security->ops->auth_type) {
 170         case DCERPC_AUTH_TYPE_SPNEGO:
 171                 gensec_gssapi_state->gss_oid = gss_mech_spnego;
 172                 break;
 173         case DCERPC_AUTH_TYPE_KRB5:
 174         default:
 175                 gensec_gssapi_state->gss_oid =
 176                         discard_const_p(void, gss_mech_krb5);
 177                 break;
 178         }
 179
 180         ret = smb_krb5_init_context(gensec_gssapi_state,
 181                                     NULL,
 182                                     gensec_security->settings->lp_ctx,
 183                                     &gensec_gssapi_state->smb_krb5_context);
 184         if (ret) {
 185                 DEBUG(1,("gensec_krb5_start: krb5_init_context failed (%s)\n",
 186                          error_message(ret)));
 187                 talloc_free(gensec_gssapi_state);
 188                 return NT_STATUS_INTERNAL_ERROR;
 189         }
 190
 191         gensec_gssapi_state->client_cred = NULL;
 192         gensec_gssapi_state->server_cred = NULL;
 193
 194         gensec_gssapi_state->lucid = NULL;
 195
 196         gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
 197
 198         gensec_gssapi_state->sasl = false;
 199         gensec_gssapi_state->sasl_state = STAGE_GSS_NEG;
 200         gensec_gssapi_state->sasl_protection = 0;
 201
 202         gensec_gssapi_state->max_wrap_buf_size
 203                 = gensec_setting_int(gensec_security->settings, "gensec_gssapi", "max wrap buf size", 65536);
 204         gensec_gssapi_state->gss_exchange_count = 0;
 205         gensec_gssapi_state->sig_size = 0;
 206
 207         talloc_set_destructor(gensec_gssapi_state, gensec_gssapi_destructor);
 208
 209 #ifdef SAMBA4_USES_HEIMDAL
 210         realm = lpcfg_realm(gensec_security->settings->lp_ctx);
 211         if (realm != NULL) {
 212                 ret = gsskrb5_set_default_realm(realm);
 213                 if (ret) {
 214                         DEBUG(1,("gensec_krb5_start: gsskrb5_set_default_realm failed\n"));
 215                         talloc_free(gensec_gssapi_state);
 216                         return NT_STATUS_INTERNAL_ERROR;
 217                 }
 218         }
 219
 220         /* don't do DNS lookups of any kind, it might/will fail for a netbios name */
 221         ret = gsskrb5_set_dns_canonicalize(gensec_setting_bool(gensec_security->settings, "krb5", "set_dns_canonicalize", false));
 222         if (ret) {
 223                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_dns_canonicalize failed\n"));
 224                 talloc_free(gensec_gssapi_state);
 225                 return NT_STATUS_INTERNAL_ERROR;
 226         }
 227 #endif
 228         return NT_STATUS_OK;
 229 }
 230
 231 static NTSTATUS gensec_gssapi_server_start(struct gensec_security *gensec_security)
 232 {
 233         NTSTATUS nt_status;
 234         int ret;
 235         struct gensec_gssapi_state *gensec_gssapi_state;
 236         struct cli_credentials *machine_account;
 237         struct gssapi_creds_container *gcc;
 238
 239         nt_status = gensec_gssapi_start(gensec_security);
 240         if (!NT_STATUS_IS_OK(nt_status)) {
 241                 return nt_status;
 242         }
 243
 244         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 245
 246         machine_account = gensec_get_credentials(gensec_security);
 247
 248         if (!machine_account) {
 249                 DEBUG(3, ("No machine account credentials specified\n"));
 250                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 251         } else {
 252                 ret = cli_credentials_get_server_gss_creds(machine_account,
 253                                                            gensec_security->settings->lp_ctx, &gcc);
 254                 if (ret) {
 255                         DEBUG(1, ("Aquiring acceptor credentials failed: %s\n",
 256                                   error_message(ret)));
 257                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 258                 }
 259         }
 260
 261         gensec_gssapi_state->server_cred = gcc;
 262         return NT_STATUS_OK;
 263
 264 }
 265
 266 static NTSTATUS gensec_gssapi_sasl_server_start(struct gensec_security *gensec_security)
 267 {
 268         NTSTATUS nt_status;
 269         struct gensec_gssapi_state *gensec_gssapi_state;
 270         nt_status = gensec_gssapi_server_start(gensec_security);
 271
 272         if (NT_STATUS_IS_OK(nt_status)) {
 273                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 274                 gensec_gssapi_state->sasl = true;
 275         }
 276         return nt_status;
 277 }
 278
 279 static NTSTATUS gensec_gssapi_client_creds(struct gensec_security *gensec_security,
 280                                            struct tevent_context *ev)
 281 {
 282         struct gensec_gssapi_state *gensec_gssapi_state;
 283         struct gssapi_creds_container *gcc;
 284         struct cli_credentials *creds = gensec_get_credentials(gensec_security);
 285         const char *error_string;
 286         int ret;
 287
 288         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 289
 290         /* Only run this the first time the update() call is made */
 291         if (gensec_gssapi_state->client_cred) {
 292                 return NT_STATUS_OK;
 293         }
 294
 295         ret = cli_credentials_get_client_gss_creds(creds,
 296                                                    ev,
 297                                                    gensec_security->settings->lp_ctx, &gcc, &error_string);
 298         switch (ret) {
 299         case 0:
 300                 break;
 301         case EINVAL:
 302                 DEBUG(3, ("Cannot obtain client GSS credentials we need to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
 303                 return NT_STATUS_INVALID_PARAMETER;
 304         case KRB5KDC_ERR_PREAUTH_FAILED:
 305         case KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN:
 306                 DEBUG(1, ("Wrong username or password: %s\n", error_string));
 307                 return NT_STATUS_LOGON_FAILURE;
 308         case KRB5_KDC_UNREACH:
 309                 DEBUG(3, ("Cannot reach a KDC we require to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
 310                 return NT_STATUS_NO_LOGON_SERVERS;
 311         case KRB5_CC_NOTFOUND:
 312         case KRB5_CC_END:
 313                 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));
 314                 return NT_STATUS_TIME_DIFFERENCE_AT_DC;
 315         default:
 316                 DEBUG(1, ("Aquiring initiator credentials failed: %s\n", error_string));
 317                 return NT_STATUS_UNSUCCESSFUL;
 318         }
 319
 320         gensec_gssapi_state->client_cred = gcc;
 321         if (!talloc_reference(gensec_gssapi_state, gcc)) {
 322                 return NT_STATUS_NO_MEMORY;
 323         }
 324
 325         return NT_STATUS_OK;
 326 }
 327
 328 static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_security)
 329 {
 330         struct gensec_gssapi_state *gensec_gssapi_state;
 331         struct cli_credentials *creds = gensec_get_credentials(gensec_security);
 332         NTSTATUS nt_status;
 333         gss_buffer_desc name_token;
 334         gss_OID name_type;
 335         OM_uint32 maj_stat, min_stat;
 336         const char *hostname = gensec_get_target_hostname(gensec_security);
 337
 338         if (!hostname) {
 339                 DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
 340                 return NT_STATUS_INVALID_PARAMETER;
 341         }
 342         if (is_ipaddress(hostname)) {
 343                 DEBUG(2, ("Cannot do GSSAPI to an IP address\n"));
 344                 return NT_STATUS_INVALID_PARAMETER;
 345         }
 346         if (strcmp(hostname, "localhost") == 0) {
 347                 DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
 348                 return NT_STATUS_INVALID_PARAMETER;
 349         }
 350
 351         nt_status = gensec_gssapi_start(gensec_security);
 352         if (!NT_STATUS_IS_OK(nt_status)) {
 353                 return nt_status;
 354         }
 355
 356         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 357
 358         if (cli_credentials_get_impersonate_principal(creds)) {
 359                 gensec_gssapi_state->gss_want_flags &= ~(GSS_C_DELEG_FLAG|GSS_C_DELEG_POLICY_FLAG);
 360         }
 361
 362         gensec_gssapi_state->target_principal = gensec_get_target_principal(gensec_security);
 363         if (gensec_gssapi_state->target_principal) {
 364                 name_type = GSS_C_NULL_OID;
 365         } else {
 366                 gensec_gssapi_state->target_principal = talloc_asprintf(gensec_gssapi_state, "%s/%s@%s",
 367                                             gensec_get_target_service(gensec_security),
 368                                             hostname, lpcfg_realm(gensec_security->settings->lp_ctx));
 369
 370                 name_type = GSS_C_NT_USER_NAME;
 371         }
 372         name_token.value  = discard_const_p(uint8_t, gensec_gssapi_state->target_principal);
 373         name_token.length = strlen(gensec_gssapi_state->target_principal);
 374
 375
 376         maj_stat = gss_import_name (&min_stat,
 377                                     &name_token,
 378                                     name_type,
 379                                     &gensec_gssapi_state->server_name);
 380         if (maj_stat) {
 381                 DEBUG(2, ("GSS Import name of %s failed: %s\n",
 382                           (char *)name_token.value,
 383                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 384                 return NT_STATUS_INVALID_PARAMETER;
 385         }
 386
 387         return NT_STATUS_OK;
 388 }
 389
 390 static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
 391 {
 392         NTSTATUS nt_status;
 393         struct gensec_gssapi_state *gensec_gssapi_state;
 394         nt_status = gensec_gssapi_client_start(gensec_security);
 395
 396         if (NT_STATUS_IS_OK(nt_status)) {
 397                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 398                 gensec_gssapi_state->sasl = true;
 399         }
 400         return nt_status;
 401 }
 402
 403
 404 /**
 405  * Next state function for the GSSAPI GENSEC mechanism
 406  *
 407  * @param gensec_gssapi_state GSSAPI State
 408  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 409  * @param in The request, as a DATA_BLOB
 410  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 411  * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
 412  *                or NT_STATUS_OK if the user is authenticated.
 413  */
 414
 415 static NTSTATUS gensec_gssapi_update(struct gensec_security *gensec_security,
 416                                      TALLOC_CTX *out_mem_ctx,
 417                                      struct tevent_context *ev,
 418                                      const DATA_BLOB in, DATA_BLOB *out)
 419 {
 420         struct gensec_gssapi_state *gensec_gssapi_state
 421                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 422         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 423         OM_uint32 maj_stat, min_stat;
 424         OM_uint32 min_stat2;
 425         gss_buffer_desc input_token, output_token;
 426         gss_OID gss_oid_p = NULL;
 427         OM_uint32 time_req = 0;
 428         OM_uint32 time_rec = 0;
 429         struct timeval tv;
 430
 431         time_req = gensec_setting_int(gensec_security->settings,
 432                                       "gensec_gssapi", "requested_life_time",
 433                                       time_req);
 434
 435         input_token.length = in.length;
 436         input_token.value = in.data;
 437
 438         switch (gensec_gssapi_state->sasl_state) {
 439         case STAGE_GSS_NEG:
 440         {
 441                 switch (gensec_security->gensec_role) {
 442                 case GENSEC_CLIENT:
 443                 {
 444 #ifdef SAMBA4_USES_HEIMDAL
 445                         struct gsskrb5_send_to_kdc send_to_kdc;
 446 #endif
 447                         krb5_error_code ret;
 448
 449                         nt_status = gensec_gssapi_client_creds(gensec_security, ev);
 450                         if (!NT_STATUS_IS_OK(nt_status)) {
 451                                 return nt_status;
 452                         }
 453
 454 #ifdef SAMBA4_USES_HEIMDAL
 455                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 456                         send_to_kdc.ptr = ev;
 457
 458                         min_stat = gsskrb5_set_send_to_kdc(&send_to_kdc);
 459                         if (min_stat) {
 460                                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
 461                                 return NT_STATUS_INTERNAL_ERROR;
 462                         }
 463 #endif
 464                         maj_stat = gss_init_sec_context(&min_stat,
 465                                                         gensec_gssapi_state->client_cred->creds,
 466                                                         &gensec_gssapi_state->gssapi_context,
 467                                                         gensec_gssapi_state->server_name,
 468                                                         gensec_gssapi_state->gss_oid,
 469                                                         gensec_gssapi_state->gss_want_flags,
 470                                                         time_req,
 471                                                         gensec_gssapi_state->input_chan_bindings,
 472                                                         &input_token,
 473                                                         &gss_oid_p,
 474                                                         &output_token,
 475                                                         &gensec_gssapi_state->gss_got_flags, /* ret flags */
 476                                                         &time_rec);
 477                         if (gss_oid_p) {
 478                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 479                         }
 480
 481 #ifdef SAMBA4_USES_HEIMDAL
 482                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 483                         send_to_kdc.ptr = NULL;
 484
 485                         ret = gsskrb5_set_send_to_kdc(&send_to_kdc);
 486                         if (ret) {
 487                                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
 488                                 return NT_STATUS_INTERNAL_ERROR;
 489                         }
 490 #endif
 491                         break;
 492                 }
 493                 case GENSEC_SERVER:
 494                 {
 495                         maj_stat = gss_accept_sec_context(&min_stat,
 496                                                           &gensec_gssapi_state->gssapi_context,
 497                                                           gensec_gssapi_state->server_cred->creds,
 498                                                           &input_token,
 499                                                           gensec_gssapi_state->input_chan_bindings,
 500                                                           &gensec_gssapi_state->client_name,
 501                                                           &gss_oid_p,
 502                                                           &output_token,
 503                                                           &gensec_gssapi_state->gss_got_flags,
 504                                                           &time_rec,
 505                                                           &gensec_gssapi_state->delegated_cred_handle);
 506                         if (gss_oid_p) {
 507                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 508                         }
 509                         break;
 510                 }
 511                 default:
 512                         return NT_STATUS_INVALID_PARAMETER;
 513
 514                 }
 515
 516                 gensec_gssapi_state->gss_exchange_count++;
 517
 518                 if (maj_stat == GSS_S_COMPLETE) {
 519                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 520                         gss_release_buffer(&min_stat2, &output_token);
 521
 522                         if (gensec_gssapi_state->gss_got_flags & GSS_C_DELEG_FLAG) {
 523                                 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
 524                         } else {
 525                                 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
 526                         }
 527
 528                         tv = timeval_current_ofs(time_rec, 0);
 529                         gensec_gssapi_state->expire_time = timeval_to_nttime(&tv);
 530
 531                         /* We may have been invoked as SASL, so there
 532                          * is more work to do */
 533                         if (gensec_gssapi_state->sasl) {
 534                                 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
 535                                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 536                         } else {
 537                                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 538
 539                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 540                                         DEBUG(5, ("GSSAPI Connection will be cryptographically sealed\n"));
 541                                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 542                                         DEBUG(5, ("GSSAPI Connection will be cryptographically signed\n"));
 543                                 } else {
 544                                         DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
 545                                 }
 546
 547                                 return NT_STATUS_OK;
 548                         }
 549                 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
 550                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 551                         gss_release_buffer(&min_stat2, &output_token);
 552
 553                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 554                 } else if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
 555                         gss_cred_id_t creds;
 556                         gss_name_t name;
 557                         gss_buffer_desc buffer;
 558                         OM_uint32 lifetime = 0;
 559                         gss_cred_usage_t usage;
 560                         const char *role = NULL;
 561                         DEBUG(0, ("GSS %s Update(krb5)(%d) Update failed, credentials expired during GSSAPI handshake!\n",
 562                                   role,
 563                                   gensec_gssapi_state->gss_exchange_count));
 564
 565
 566                         switch (gensec_security->gensec_role) {
 567                         case GENSEC_CLIENT:
 568                                 creds = gensec_gssapi_state->client_cred->creds;
 569                                 role = "client";
 570                                 break;
 571                         case GENSEC_SERVER:
 572                                 creds = gensec_gssapi_state->server_cred->creds;
 573                                 role = "server";
 574                                 break;
 575                         }
 576
 577                         maj_stat = gss_inquire_cred(&min_stat,
 578                                                     creds,
 579                                                     &name, &lifetime, &usage, NULL);
 580
 581                         if (maj_stat == GSS_S_COMPLETE) {
 582                                 const char *usage_string;
 583                                 switch (usage) {
 584                                 case GSS_C_BOTH:
 585                                         usage_string = "GSS_C_BOTH";
 586                                         break;
 587                                 case GSS_C_ACCEPT:
 588                                         usage_string = "GSS_C_ACCEPT";
 589                                         break;
 590                                 case GSS_C_INITIATE:
 591                                         usage_string = "GSS_C_INITIATE";
 592                                         break;
 593                                 }
 594                                 maj_stat = gss_display_name(&min_stat, name, &buffer, NULL);
 595                                 if (maj_stat) {
 596                                         buffer.value = NULL;
 597                                         buffer.length = 0;
 598                                 }
 599                                 if (lifetime > 0) {
 600                                         DEBUG(0, ("GSSAPI gss_inquire_cred indicates expiry of %*.*s in %u sec for %s\n",
 601                                                   (int)buffer.length, (int)buffer.length, (char *)buffer.value,
 602                                                   lifetime, usage_string));
 603                                 } else {
 604                                         DEBUG(0, ("GSSAPI gss_inquire_cred indicates %*.*s has already expired for %s\n",
 605                                                   (int)buffer.length, (int)buffer.length, (char *)buffer.value,
 606                                                   usage_string));
 607                                 }
 608                                 gss_release_buffer(&min_stat, &buffer);
 609                                 gss_release_name(&min_stat, &name);
 610                         } else if (maj_stat != GSS_S_COMPLETE) {
 611                                 DEBUG(0, ("inquiry of credential lifefime via GSSAPI gss_inquire_cred failed: %s\n",
 612                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 613                         }
 614                         return NT_STATUS_INVALID_PARAMETER;
 615                 } else if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
 616                         switch (min_stat) {
 617                         case KRB5KRB_AP_ERR_TKT_NYV:
 618                                 DEBUG(1, ("Error with ticket to contact %s: possible clock skew between us and the KDC or target server: %s\n",
 619                                           gensec_gssapi_state->target_principal,
 620                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 621                                 return NT_STATUS_TIME_DIFFERENCE_AT_DC; /* Make SPNEGO ignore us, we can't go any further here */
 622                         case KRB5KRB_AP_ERR_TKT_EXPIRED:
 623                                 DEBUG(1, ("Error with ticket to contact %s: ticket is expired, possible clock skew between us and the KDC or target server: %s\n",
 624                                           gensec_gssapi_state->target_principal,
 625                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 626                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 627                         case KRB5_KDC_UNREACH:
 628                                 DEBUG(3, ("Cannot reach a KDC we require in order to obtain a ticetk to %s: %s\n",
 629                                           gensec_gssapi_state->target_principal,
 630                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 631                                 return NT_STATUS_NO_LOGON_SERVERS; /* Make SPNEGO ignore us, we can't go any further here */
 632                         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 633                                 DEBUG(3, ("Server %s is not registered with our KDC: %s\n",
 634                                           gensec_gssapi_state->target_principal,
 635                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 636                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 637                         case KRB5KRB_AP_ERR_MSG_TYPE:
 638                                 /* garbage input, possibly from the auto-mech detection */
 639                                 return NT_STATUS_INVALID_PARAMETER;
 640                         default:
 641                                 DEBUG(1, ("GSS %s Update(krb5)(%d) Update failed: %s\n",
 642                                           gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 643                                           gensec_gssapi_state->gss_exchange_count,
 644                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 645                                 return nt_status;
 646                         }
 647                 } else {
 648                         DEBUG(1, ("GSS %s Update(%d) failed: %s\n",
 649                                   gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 650                                   gensec_gssapi_state->gss_exchange_count,
 651                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 652                         return nt_status;
 653                 }
 654                 break;
 655         }
 656
 657         /* These last two stages are only done if we were invoked as SASL */
 658         case STAGE_SASL_SSF_NEG:
 659         {
 660                 switch (gensec_security->gensec_role) {
 661                 case GENSEC_CLIENT:
 662                 {
 663                         uint8_t maxlength_proposed[4];
 664                         uint8_t maxlength_accepted[4];
 665                         uint8_t security_supported;
 666                         int conf_state;
 667                         gss_qop_t qop_state;
 668                         input_token.length = in.length;
 669                         input_token.value = in.data;
 670
 671                         /* As a client, we have just send a
 672                          * zero-length blob to the server (after the
 673                          * normal GSSAPI exchange), and it has replied
 674                          * with it's SASL negotiation */
 675
 676                         maj_stat = gss_unwrap(&min_stat,
 677                                               gensec_gssapi_state->gssapi_context,
 678                                               &input_token,
 679                                               &output_token,
 680                                               &conf_state,
 681                                               &qop_state);
 682                         if (GSS_ERROR(maj_stat)) {
 683                                 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 684                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 685                                 return NT_STATUS_ACCESS_DENIED;
 686                         }
 687
 688                         if (output_token.length < 4) {
 689                                 return NT_STATUS_INVALID_PARAMETER;
 690                         }
 691
 692                         memcpy(maxlength_proposed, output_token.value, 4);
 693                         gss_release_buffer(&min_stat, &output_token);
 694
 695                         /* first byte is the proposed security */
 696                         security_supported = maxlength_proposed[0];
 697                         maxlength_proposed[0] = '\0';
 698
 699                         /* Rest is the proposed max wrap length */
 700                         gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
 701                                                                      gensec_gssapi_state->max_wrap_buf_size);
 702                         gensec_gssapi_state->sasl_protection = 0;
 703                         if (security_supported & NEG_SEAL) {
 704                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 705                                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 706                                 }
 707                         }
 708                         if (security_supported & NEG_SIGN) {
 709                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 710                                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 711                                 }
 712                         }
 713                         if (security_supported & NEG_NONE) {
 714                                 gensec_gssapi_state->sasl_protection |= NEG_NONE;
 715                         }
 716                         if (gensec_gssapi_state->sasl_protection == 0) {
 717                                 DEBUG(1, ("Remote server does not support unprotected connections\n"));
 718                                 return NT_STATUS_ACCESS_DENIED;
 719                         }
 720
 721                         /* Send back the negotiated max length */
 722
 723                         RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
 724
 725                         maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
 726
 727                         input_token.value = maxlength_accepted;
 728                         input_token.length = sizeof(maxlength_accepted);
 729
 730                         maj_stat = gss_wrap(&min_stat,
 731                                             gensec_gssapi_state->gssapi_context,
 732                                             false,
 733                                             GSS_C_QOP_DEFAULT,
 734                                             &input_token,
 735                                             &conf_state,
 736                                             &output_token);
 737                         if (GSS_ERROR(maj_stat)) {
 738                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 739                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 740                                 return NT_STATUS_ACCESS_DENIED;
 741                         }
 742
 743                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 744                         gss_release_buffer(&min_stat, &output_token);
 745
 746                         /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 747                         gensec_gssapi_state->sasl_state = STAGE_DONE;
 748
 749                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 750                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically sealed\n"));
 751                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 752                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically signed\n"));
 753                         } else {
 754                                 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographically protection\n"));
 755                         }
 756
 757                         return NT_STATUS_OK;
 758                 }
 759                 case GENSEC_SERVER:
 760                 {
 761                         uint8_t maxlength_proposed[4];
 762                         uint8_t security_supported = 0x0;
 763                         int conf_state;
 764
 765                         /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
 766                         if (in.length != 0) {
 767                                 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
 768                         }
 769
 770                         /* Give the client some idea what we will support */
 771
 772                         RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
 773                         /* first byte is the proposed security */
 774                         maxlength_proposed[0] = '\0';
 775
 776                         gensec_gssapi_state->sasl_protection = 0;
 777                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 778                                 security_supported |= NEG_SEAL;
 779                         }
 780                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 781                                 security_supported |= NEG_SIGN;
 782                         }
 783                         if (security_supported == 0) {
 784                                 /* If we don't support anything, this must be 0 */
 785                                 RSIVAL(maxlength_proposed, 0, 0x0);
 786                         }
 787
 788                         /* TODO:  We may not wish to support this */
 789                         security_supported |= NEG_NONE;
 790                         maxlength_proposed[0] = security_supported;
 791
 792                         input_token.value = maxlength_proposed;
 793                         input_token.length = sizeof(maxlength_proposed);
 794
 795                         maj_stat = gss_wrap(&min_stat,
 796                                             gensec_gssapi_state->gssapi_context,
 797                                             false,
 798                                             GSS_C_QOP_DEFAULT,
 799                                             &input_token,
 800                                             &conf_state,
 801                                             &output_token);
 802                         if (GSS_ERROR(maj_stat)) {
 803                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 804                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 805                                 return NT_STATUS_ACCESS_DENIED;
 806                         }
 807
 808                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 809                         gss_release_buffer(&min_stat, &output_token);
 810
 811                         gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
 812                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 813                 }
 814                 default:
 815                         return NT_STATUS_INVALID_PARAMETER;
 816
 817                 }
 818         }
 819         /* This is s server-only stage */
 820         case STAGE_SASL_SSF_ACCEPT:
 821         {
 822                 uint8_t maxlength_accepted[4];
 823                 uint8_t security_accepted;
 824                 int conf_state;
 825                 gss_qop_t qop_state;
 826                 input_token.length = in.length;
 827                 input_token.value = in.data;
 828
 829                 maj_stat = gss_unwrap(&min_stat,
 830                                       gensec_gssapi_state->gssapi_context,
 831                                       &input_token,
 832                                       &output_token,
 833                                       &conf_state,
 834                                       &qop_state);
 835                 if (GSS_ERROR(maj_stat)) {
 836                         DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 837                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 838                         return NT_STATUS_ACCESS_DENIED;
 839                 }
 840
 841                 if (output_token.length < 4) {
 842                         return NT_STATUS_INVALID_PARAMETER;
 843                 }
 844
 845                 memcpy(maxlength_accepted, output_token.value, 4);
 846                 gss_release_buffer(&min_stat, &output_token);
 847
 848                 /* first byte is the proposed security */
 849                 security_accepted = maxlength_accepted[0];
 850                 maxlength_accepted[0] = '\0';
 851
 852                 /* Rest is the proposed max wrap length */
 853                 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
 854                                                              gensec_gssapi_state->max_wrap_buf_size);
 855
 856                 gensec_gssapi_state->sasl_protection = 0;
 857                 if (security_accepted & NEG_SEAL) {
 858                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 859                                 DEBUG(1, ("Remote client wanted seal, but gensec refused\n"));
 860                                 return NT_STATUS_ACCESS_DENIED;
 861                         }
 862                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 863                 }
 864                 if (security_accepted & NEG_SIGN) {
 865                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 866                                 DEBUG(1, ("Remote client wanted sign, but gensec refused\n"));
 867                                 return NT_STATUS_ACCESS_DENIED;
 868                         }
 869                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 870                 }
 871                 if (security_accepted & NEG_NONE) {
 872                         gensec_gssapi_state->sasl_protection |= NEG_NONE;
 873                 }
 874
 875                 /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 876                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 877                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 878                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically sealed\n"));
 879                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 880                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically signed\n"));
 881                 } else {
 882                         DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
 883                 }
 884
 885                 *out = data_blob(NULL, 0);
 886                 return NT_STATUS_OK;
 887         }
 888         default:
 889                 return NT_STATUS_INVALID_PARAMETER;
 890         }
 891 }
 892
 893 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
 894                                    TALLOC_CTX *mem_ctx,
 895                                    const DATA_BLOB *in,
 896                                    DATA_BLOB *out)
 897 {
 898         struct gensec_gssapi_state *gensec_gssapi_state
 899                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 900         OM_uint32 maj_stat, min_stat;
 901         gss_buffer_desc input_token, output_token;
 902         int conf_state;
 903         input_token.length = in->length;
 904         input_token.value = in->data;
 905
 906         maj_stat = gss_wrap(&min_stat,
 907                             gensec_gssapi_state->gssapi_context,
 908                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 909                             GSS_C_QOP_DEFAULT,
 910                             &input_token,
 911                             &conf_state,
 912                             &output_token);
 913         if (GSS_ERROR(maj_stat)) {
 914                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 915                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 916                 return NT_STATUS_ACCESS_DENIED;
 917         }
 918
 919         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 920         gss_release_buffer(&min_stat, &output_token);
 921
 922         if (gensec_gssapi_state->sasl) {
 923                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 924                 if (max_wrapped_size < out->length) {
 925                         DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
 926                                   (unsigned)in->length,
 927                                   (unsigned)out->length,
 928                                   (unsigned int)max_wrapped_size));
 929                         return NT_STATUS_INVALID_PARAMETER;
 930                 }
 931         }
 932
 933         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 934             && !conf_state) {
 935                 return NT_STATUS_ACCESS_DENIED;
 936         }
 937         return NT_STATUS_OK;
 938 }
 939
 940 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
 941                                      TALLOC_CTX *mem_ctx,
 942                                      const DATA_BLOB *in,
 943                                      DATA_BLOB *out)
 944 {
 945         struct gensec_gssapi_state *gensec_gssapi_state
 946                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 947         OM_uint32 maj_stat, min_stat;
 948         gss_buffer_desc input_token, output_token;
 949         int conf_state;
 950         gss_qop_t qop_state;
 951         input_token.length = in->length;
 952         input_token.value = in->data;
 953
 954         if (gensec_gssapi_state->sasl) {
 955                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 956                 if (max_wrapped_size < in->length) {
 957                         DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
 958                         return NT_STATUS_INVALID_PARAMETER;
 959                 }
 960         }
 961
 962         maj_stat = gss_unwrap(&min_stat,
 963                               gensec_gssapi_state->gssapi_context,
 964                               &input_token,
 965                               &output_token,
 966                               &conf_state,
 967                               &qop_state);
 968         if (GSS_ERROR(maj_stat)) {
 969                 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
 970                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 971                 return NT_STATUS_ACCESS_DENIED;
 972         }
 973
 974         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 975         gss_release_buffer(&min_stat, &output_token);
 976
 977         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 978             && !conf_state) {
 979                 return NT_STATUS_ACCESS_DENIED;
 980         }
 981         return NT_STATUS_OK;
 982 }
 983
 984 /* Find out the maximum input size negotiated on this connection */
 985
 986 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
 987 {
 988         struct gensec_gssapi_state *gensec_gssapi_state
 989                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 990         OM_uint32 maj_stat, min_stat;
 991         OM_uint32 max_input_size;
 992
 993         maj_stat = gss_wrap_size_limit(&min_stat,
 994                                        gensec_gssapi_state->gssapi_context,
 995                                        gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 996                                        GSS_C_QOP_DEFAULT,
 997                                        gensec_gssapi_state->max_wrap_buf_size,
 998                                        &max_input_size);
 999         if (GSS_ERROR(maj_stat)) {
1000                 TALLOC_CTX *mem_ctx = talloc_new(NULL);
1001                 DEBUG(1, ("gensec_gssapi_max_input_size: determinaing signature size with gss_wrap_size_limit failed: %s\n",
1002                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1003                 talloc_free(mem_ctx);
1004                 return 0;
1005         }
1006
1007         return max_input_size;
1008 }
1009
1010 /* Find out the maximum output size negotiated on this connection */
1011 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
1012 {
1013         struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
1014         return gensec_gssapi_state->max_wrap_buf_size;
1015 }
1016
1017 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
1018                                           TALLOC_CTX *mem_ctx,
1019                                           uint8_t *data, size_t length,
1020                                           const uint8_t *whole_pdu, size_t pdu_length,
1021                                           DATA_BLOB *sig)
1022 {
1023         struct gensec_gssapi_state *gensec_gssapi_state
1024                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1025         OM_uint32 maj_stat, min_stat;
1026         gss_buffer_desc input_token, output_token;
1027         int conf_state;
1028         ssize_t sig_length;
1029
1030         input_token.length = length;
1031         input_token.value = data;
1032
1033         maj_stat = gss_wrap(&min_stat,
1034                             gensec_gssapi_state->gssapi_context,
1035                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
1036                             GSS_C_QOP_DEFAULT,
1037                             &input_token,
1038                             &conf_state,
1039                             &output_token);
1040         if (GSS_ERROR(maj_stat)) {
1041                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
1042                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1043                 return NT_STATUS_ACCESS_DENIED;
1044         }
1045
1046         if (output_token.length < input_token.length) {
1047                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
1048                           (long)output_token.length, (long)length));
1049                 return NT_STATUS_INTERNAL_ERROR;
1050         }
1051         sig_length = output_token.length - input_token.length;
1052
1053         memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
1054         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
1055
1056         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1057         dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
1058         dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
1059
1060         gss_release_buffer(&min_stat, &output_token);
1061
1062         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1063             && !conf_state) {
1064                 return NT_STATUS_ACCESS_DENIED;
1065         }
1066         return NT_STATUS_OK;
1067 }
1068
1069 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
1070                                             uint8_t *data, size_t length,
1071                                             const uint8_t *whole_pdu, size_t pdu_length,
1072                                             const DATA_BLOB *sig)
1073 {
1074         struct gensec_gssapi_state *gensec_gssapi_state
1075                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1076         OM_uint32 maj_stat, min_stat;
1077         gss_buffer_desc input_token, output_token;
1078         int conf_state;
1079         gss_qop_t qop_state;
1080         DATA_BLOB in;
1081
1082         dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
1083
1084         in = data_blob_talloc(gensec_security, NULL, sig->length + length);
1085
1086         memcpy(in.data, sig->data, sig->length);
1087         memcpy(in.data + sig->length, data, length);
1088
1089         input_token.length = in.length;
1090         input_token.value = in.data;
1091
1092         maj_stat = gss_unwrap(&min_stat,
1093                               gensec_gssapi_state->gssapi_context,
1094                               &input_token,
1095                               &output_token,
1096                               &conf_state,
1097                               &qop_state);
1098         talloc_free(in.data);
1099         if (GSS_ERROR(maj_stat)) {
1100                 char *error_string = gssapi_error_string(NULL, maj_stat, min_stat, gensec_gssapi_state->gss_oid);
1101                 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
1102                           error_string));
1103                 talloc_free(error_string);
1104                 return NT_STATUS_ACCESS_DENIED;
1105         }
1106
1107         if (output_token.length != length) {
1108                 return NT_STATUS_INTERNAL_ERROR;
1109         }
1110
1111         memcpy(data, output_token.value, length);
1112
1113         gss_release_buffer(&min_stat, &output_token);
1114
1115         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1116             && !conf_state) {
1117                 return NT_STATUS_ACCESS_DENIED;
1118         }
1119         return NT_STATUS_OK;
1120 }
1121
1122 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1123                                           TALLOC_CTX *mem_ctx,
1124                                           const uint8_t *data, size_t length,
1125                                           const uint8_t *whole_pdu, size_t pdu_length,
1126                                           DATA_BLOB *sig)
1127 {
1128         struct gensec_gssapi_state *gensec_gssapi_state
1129                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1130         OM_uint32 maj_stat, min_stat;
1131         gss_buffer_desc input_token, output_token;
1132
1133         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1134                 input_token.length = pdu_length;
1135                 input_token.value = discard_const_p(uint8_t *, whole_pdu);
1136         } else {
1137                 input_token.length = length;
1138                 input_token.value = discard_const_p(uint8_t *, data);
1139         }
1140
1141         maj_stat = gss_get_mic(&min_stat,
1142                             gensec_gssapi_state->gssapi_context,
1143                             GSS_C_QOP_DEFAULT,
1144                             &input_token,
1145                             &output_token);
1146         if (GSS_ERROR(maj_stat)) {
1147                 DEBUG(1, ("GSS GetMic failed: %s\n",
1148                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1149                 return NT_STATUS_ACCESS_DENIED;
1150         }
1151
1152         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, output_token.length);
1153
1154         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1155
1156         gss_release_buffer(&min_stat, &output_token);
1157
1158         return NT_STATUS_OK;
1159 }
1160
1161 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1162                                            const uint8_t *data, size_t length,
1163                                            const uint8_t *whole_pdu, size_t pdu_length,
1164                                            const DATA_BLOB *sig)
1165 {
1166         struct gensec_gssapi_state *gensec_gssapi_state
1167                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1168         OM_uint32 maj_stat, min_stat;
1169         gss_buffer_desc input_token;
1170         gss_buffer_desc input_message;
1171         gss_qop_t qop_state;
1172
1173         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1174
1175         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1176                 input_message.length = pdu_length;
1177                 input_message.value = discard_const(whole_pdu);
1178         } else {
1179                 input_message.length = length;
1180                 input_message.value = discard_const(data);
1181         }
1182
1183         input_token.length = sig->length;
1184         input_token.value = sig->data;
1185
1186         maj_stat = gss_verify_mic(&min_stat,
1187                               gensec_gssapi_state->gssapi_context,
1188                               &input_message,
1189                               &input_token,
1190                               &qop_state);
1191         if (GSS_ERROR(maj_stat)) {
1192                 char *error_string = gssapi_error_string(NULL, maj_stat, min_stat, gensec_gssapi_state->gss_oid);
1193                 DEBUG(1, ("GSS VerifyMic failed: %s\n", error_string));
1194                 talloc_free(error_string);
1195
1196                 return NT_STATUS_ACCESS_DENIED;
1197         }
1198
1199         return NT_STATUS_OK;
1200 }
1201
1202 /* Try to figure out what features we actually got on the connection */
1203 static bool gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1204                                        uint32_t feature)
1205 {
1206         struct gensec_gssapi_state *gensec_gssapi_state
1207                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1208         if (feature & GENSEC_FEATURE_SIGN) {
1209                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1210                 if (gensec_gssapi_state->sasl
1211                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1212                         return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1213                                 && (gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG));
1214                 }
1215                 return gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG;
1216         }
1217         if (feature & GENSEC_FEATURE_SEAL) {
1218                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1219                 if (gensec_gssapi_state->sasl
1220                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1221                         return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1222                                  && (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG));
1223                 }
1224                 return gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG;
1225         }
1226         if (feature & GENSEC_FEATURE_SESSION_KEY) {
1227                 /* Only for GSSAPI/Krb5 */
1228                 if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
1229                         return true;
1230                 }
1231         }
1232         if (feature & GENSEC_FEATURE_DCE_STYLE) {
1233                 return gensec_gssapi_state->gss_got_flags & GSS_C_DCE_STYLE;
1234         }
1235         if (feature & GENSEC_FEATURE_NEW_SPNEGO) {
1236                 NTSTATUS status;
1237                 uint32_t keytype;
1238
1239                 if (!(gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG)) {
1240                         return false;
1241                 }
1242
1243                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "force_new_spnego", false)) {
1244                         return true;
1245                 }
1246                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "disable_new_spnego", false)) {
1247                         return false;
1248                 }
1249
1250                 status = gssapi_get_session_key(gensec_gssapi_state,
1251                                                 gensec_gssapi_state->gssapi_context, NULL, &keytype);
1252                 /*
1253                  * We should do a proper sig on the mechListMic unless
1254                  * we know we have to be backwards compatible with
1255                  * earlier windows versions.
1256                  *
1257                  * Negotiating a non-krb5
1258                  * mech for example should be regarded as having
1259                  * NEW_SPNEGO
1260                  */
1261                 if (NT_STATUS_IS_OK(status)) {
1262                         switch (keytype) {
1263                         case ENCTYPE_DES_CBC_CRC:
1264                         case ENCTYPE_DES_CBC_MD5:
1265                         case ENCTYPE_ARCFOUR_HMAC:
1266                         case ENCTYPE_DES3_CBC_SHA1:
1267                                 return false;
1268                         }
1269                 }
1270                 return true;
1271         }
1272         /* We can always do async (rather than strict request/reply) packets.  */
1273         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1274                 return true;
1275         }
1276         return false;
1277 }
1278
1279 static NTTIME gensec_gssapi_expire_time(struct gensec_security *gensec_security)
1280 {
1281         struct gensec_gssapi_state *gensec_gssapi_state =
1282                 talloc_get_type_abort(gensec_security->private_data,
1283                 struct gensec_gssapi_state);
1284
1285         return gensec_gssapi_state->expire_time;
1286 }
1287
1288 /*
1289  * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1290  * (for encrypting some passwords).
1291  *
1292  * This breaks all the abstractions, but what do you expect...
1293  */
1294 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1295                                           TALLOC_CTX *mem_ctx,
1296                                           DATA_BLOB *session_key)
1297 {
1298         struct gensec_gssapi_state *gensec_gssapi_state
1299                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1300         return gssapi_get_session_key(mem_ctx, gensec_gssapi_state->gssapi_context, session_key, NULL);
1301 }
1302
1303 /* Get some basic (and authorization) information about the user on
1304  * this session.  This uses either the PAC (if present) or a local
1305  * database lookup */
1306 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1307                                            TALLOC_CTX *mem_ctx,
1308                                            struct auth_session_info **_session_info)
1309 {
1310         NTSTATUS nt_status;
1311         TALLOC_CTX *tmp_ctx;
1312         struct gensec_gssapi_state *gensec_gssapi_state
1313                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1314         struct auth_session_info *session_info = NULL;
1315         OM_uint32 maj_stat, min_stat;
1316         DATA_BLOB pac_blob, *pac_blob_ptr = NULL;
1317
1318         gss_buffer_desc name_token;
1319         char *principal_string;
1320
1321         tmp_ctx = talloc_named(mem_ctx, 0, "gensec_gssapi_session_info context");
1322         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
1323
1324         maj_stat = gss_display_name (&min_stat,
1325                                      gensec_gssapi_state->client_name,
1326                                      &name_token,
1327                                      NULL);
1328         if (GSS_ERROR(maj_stat)) {
1329                 DEBUG(1, ("GSS display_name failed: %s\n",
1330                           gssapi_error_string(tmp_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1331                 talloc_free(tmp_ctx);
1332                 return NT_STATUS_FOOBAR;
1333         }
1334
1335         principal_string = talloc_strndup(tmp_ctx,
1336                                           (const char *)name_token.value,
1337                                           name_token.length);
1338
1339         gss_release_buffer(&min_stat, &name_token);
1340
1341         if (!principal_string) {
1342                 talloc_free(tmp_ctx);
1343                 return NT_STATUS_NO_MEMORY;
1344         }
1345
1346         nt_status = gssapi_obtain_pac_blob(tmp_ctx,  gensec_gssapi_state->gssapi_context,
1347                                            gensec_gssapi_state->client_name,
1348                                            &pac_blob);
1349
1350         /* IF we have the PAC - otherwise we need to get this
1351          * data from elsewere - local ldb, or (TODO) lookup of some
1352          * kind...
1353          */
1354         if (NT_STATUS_IS_OK(nt_status)) {
1355                 pac_blob_ptr = &pac_blob;
1356         }
1357         nt_status = gensec_generate_session_info_pac(tmp_ctx,
1358                                                      gensec_security,
1359                                                      gensec_gssapi_state->smb_krb5_context,
1360                                                      pac_blob_ptr, principal_string,
1361                                                      gensec_get_remote_address(gensec_security),
1362                                                      &session_info);
1363         if (!NT_STATUS_IS_OK(nt_status)) {
1364                 talloc_free(tmp_ctx);
1365                 return nt_status;
1366         }
1367
1368         nt_status = gensec_gssapi_session_key(gensec_security, session_info, &session_info->session_key);
1369         if (!NT_STATUS_IS_OK(nt_status)) {
1370                 talloc_free(tmp_ctx);
1371                 return nt_status;
1372         }
1373
1374         if (!(gensec_gssapi_state->gss_got_flags & GSS_C_DELEG_FLAG)) {
1375                 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1376         } else {
1377                 krb5_error_code ret;
1378                 const char *error_string;
1379
1380                 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1381                 session_info->credentials = cli_credentials_init(session_info);
1382                 if (!session_info->credentials) {
1383                         talloc_free(tmp_ctx);
1384                         return NT_STATUS_NO_MEMORY;
1385                 }
1386
1387                 cli_credentials_set_conf(session_info->credentials, gensec_security->settings->lp_ctx);
1388                 /* Just so we don't segfault trying to get at a username */
1389                 cli_credentials_set_anonymous(session_info->credentials);
1390
1391                 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1392                                                            gensec_security->settings->lp_ctx,
1393                                                            gensec_gssapi_state->delegated_cred_handle,
1394                                                            CRED_SPECIFIED, &error_string);
1395                 if (ret) {
1396                         talloc_free(tmp_ctx);
1397                         DEBUG(2,("Failed to get gss creds: %s\n", error_string));
1398                         return NT_STATUS_NO_MEMORY;
1399                 }
1400
1401                 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1402                 cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
1403
1404                 /* It has been taken from this place... */
1405                 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1406         }
1407         *_session_info = talloc_steal(mem_ctx, session_info);
1408         talloc_free(tmp_ctx);
1409
1410         return NT_STATUS_OK;
1411 }
1412
1413 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
1414 {
1415         struct gensec_gssapi_state *gensec_gssapi_state
1416                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1417         NTSTATUS status;
1418
1419         if (gensec_gssapi_state->sig_size) {
1420                 return gensec_gssapi_state->sig_size;
1421         }
1422
1423         if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1424                 gensec_gssapi_state->sig_size = 45;
1425         } else {
1426                 gensec_gssapi_state->sig_size = 37;
1427         }
1428
1429         status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1430         if (!NT_STATUS_IS_OK(status)) {
1431                 return gensec_gssapi_state->sig_size;
1432         }
1433
1434         if (gensec_gssapi_state->lucid->protocol == 1) {
1435                 if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1436                         /*
1437                          * TODO: windows uses 76 here, but we don't know
1438                          *       gss_wrap works with aes keys yet
1439                          */
1440                         gensec_gssapi_state->sig_size = 76;
1441                 } else {
1442                         gensec_gssapi_state->sig_size = 28;
1443                 }
1444         } else if (gensec_gssapi_state->lucid->protocol == 0) {
1445                 switch (gensec_gssapi_state->lucid->rfc1964_kd.ctx_key.type) {
1446                 case ENCTYPE_DES_CBC_CRC:
1447                 case ENCTYPE_ARCFOUR_HMAC:
1448                 case ENCTYPE_ARCFOUR_HMAC_EXP:
1449                         if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1450                                 gensec_gssapi_state->sig_size = 45;
1451                         } else {
1452                                 gensec_gssapi_state->sig_size = 37;
1453                         }
1454                         break;
1455 #ifdef SAMBA4_USES_HEIMDAL
1456                 case ENCTYPE_OLD_DES3_CBC_SHA1:
1457                         if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1458                                 gensec_gssapi_state->sig_size = 57;
1459                         } else {
1460                                 gensec_gssapi_state->sig_size = 49;
1461                         }
1462                         break;
1463 #endif
1464                 }
1465         }
1466
1467         return gensec_gssapi_state->sig_size;
1468 }
1469
1470 static const char *gensec_gssapi_krb5_oids[] = {
1471         GENSEC_OID_KERBEROS5_OLD,
1472         GENSEC_OID_KERBEROS5,
1473         NULL
1474 };
1475
1476 static const char *gensec_gssapi_spnego_oids[] = {
1477         GENSEC_OID_SPNEGO,
1478         NULL
1479 };
1480
1481 /* As a server, this could in theory accept any GSSAPI mech */
1482 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1483         .name           = "gssapi_spnego",
1484         .sasl_name      = "GSS-SPNEGO",
1485         .auth_type      = DCERPC_AUTH_TYPE_SPNEGO,
1486         .oid            = gensec_gssapi_spnego_oids,
1487         .client_start   = gensec_gssapi_client_start,
1488         .server_start   = gensec_gssapi_server_start,
1489         .magic          = gensec_magic_check_krb5_oid,
1490         .update         = gensec_gssapi_update,
1491         .session_key    = gensec_gssapi_session_key,
1492         .session_info   = gensec_gssapi_session_info,
1493         .sign_packet    = gensec_gssapi_sign_packet,
1494         .check_packet   = gensec_gssapi_check_packet,
1495         .seal_packet    = gensec_gssapi_seal_packet,
1496         .unseal_packet  = gensec_gssapi_unseal_packet,
1497         .wrap           = gensec_gssapi_wrap,
1498         .unwrap         = gensec_gssapi_unwrap,
1499         .have_feature   = gensec_gssapi_have_feature,
1500         .expire_time    = gensec_gssapi_expire_time,
1501         .enabled        = false,
1502         .kerberos       = true,
1503         .priority       = GENSEC_GSSAPI
1504 };
1505
1506 /* As a server, this could in theory accept any GSSAPI mech */
1507 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1508         .name           = "gssapi_krb5",
1509         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
1510         .oid            = gensec_gssapi_krb5_oids,
1511         .client_start   = gensec_gssapi_client_start,
1512         .server_start   = gensec_gssapi_server_start,
1513         .magic          = gensec_magic_check_krb5_oid,
1514         .update         = gensec_gssapi_update,
1515         .session_key    = gensec_gssapi_session_key,
1516         .session_info   = gensec_gssapi_session_info,
1517         .sig_size       = gensec_gssapi_sig_size,
1518         .sign_packet    = gensec_gssapi_sign_packet,
1519         .check_packet   = gensec_gssapi_check_packet,
1520         .seal_packet    = gensec_gssapi_seal_packet,
1521         .unseal_packet  = gensec_gssapi_unseal_packet,
1522         .wrap           = gensec_gssapi_wrap,
1523         .unwrap         = gensec_gssapi_unwrap,
1524         .have_feature   = gensec_gssapi_have_feature,
1525         .expire_time    = gensec_gssapi_expire_time,
1526         .enabled        = true,
1527         .kerberos       = true,
1528         .priority       = GENSEC_GSSAPI
1529 };
1530
1531 /* As a server, this could in theory accept any GSSAPI mech */
1532 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1533         .name             = "gssapi_krb5_sasl",
1534         .sasl_name        = "GSSAPI",
1535         .client_start     = gensec_gssapi_sasl_client_start,
1536         .server_start     = gensec_gssapi_sasl_server_start,
1537         .update           = gensec_gssapi_update,
1538         .session_key      = gensec_gssapi_session_key,
1539         .session_info     = gensec_gssapi_session_info,
1540         .max_input_size   = gensec_gssapi_max_input_size,
1541         .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1542         .wrap             = gensec_gssapi_wrap,
1543         .unwrap           = gensec_gssapi_unwrap,
1544         .have_feature     = gensec_gssapi_have_feature,
1545         .expire_time      = gensec_gssapi_expire_time,
1546         .enabled          = true,
1547         .kerberos         = true,
1548         .priority         = GENSEC_GSSAPI
1549 };
1550
1551 _PUBLIC_ NTSTATUS gensec_gssapi_init(void)
1552 {
1553         NTSTATUS ret;
1554
1555         ret = gensec_register(&gensec_gssapi_spnego_security_ops);
1556         if (!NT_STATUS_IS_OK(ret)) {
1557                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1558                         gensec_gssapi_spnego_security_ops.name));
1559                 return ret;
1560         }
1561
1562         ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1563         if (!NT_STATUS_IS_OK(ret)) {
1564                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1565                         gensec_gssapi_krb5_security_ops.name));
1566                 return ret;
1567         }
1568
1569         ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1570         if (!NT_STATUS_IS_OK(ret)) {
1571                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1572                         gensec_gssapi_sasl_krb5_security_ops.name));
1573                 return ret;
1574         }
1575
1576         return ret;
1577 }