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_gssapi_start: smb_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_gssapi_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_gssapi_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(3, ("No hostname for target computer passed in, cannot use kerberos for this connection\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_gssapi_update: 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_gssapi_update: 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 (smb_gss_oid_equal(gensec_gssapi_state->gss_oid,
 616                                              gss_mech_krb5)) {
 617                         switch (min_stat) {
 618                         case KRB5KRB_AP_ERR_TKT_NYV:
 619                                 DEBUG(1, ("Error with ticket to contact %s: possible clock skew between us and the KDC or target server: %s\n",
 620                                           gensec_gssapi_state->target_principal,
 621                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 622                                 return NT_STATUS_TIME_DIFFERENCE_AT_DC; /* Make SPNEGO ignore us, we can't go any further here */
 623                         case KRB5KRB_AP_ERR_TKT_EXPIRED:
 624                                 DEBUG(1, ("Error with ticket to contact %s: ticket is expired, possible clock skew between us and the KDC or target server: %s\n",
 625                                           gensec_gssapi_state->target_principal,
 626                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 627                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 628                         case KRB5_KDC_UNREACH:
 629                                 DEBUG(3, ("Cannot reach a KDC we require in order to obtain a ticetk to %s: %s\n",
 630                                           gensec_gssapi_state->target_principal,
 631                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 632                                 return NT_STATUS_NO_LOGON_SERVERS; /* Make SPNEGO ignore us, we can't go any further here */
 633                         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 634                                 DEBUG(3, ("Server %s is not registered with our KDC: %s\n",
 635                                           gensec_gssapi_state->target_principal,
 636                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 637                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 638                         case KRB5KRB_AP_ERR_MSG_TYPE:
 639                                 /* garbage input, possibly from the auto-mech detection */
 640                                 return NT_STATUS_INVALID_PARAMETER;
 641                         default:
 642                                 DEBUG(1, ("GSS %s Update(krb5)(%d) Update failed: %s\n",
 643                                           gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 644                                           gensec_gssapi_state->gss_exchange_count,
 645                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 646                                 return nt_status;
 647                         }
 648                 } else {
 649                         DEBUG(1, ("GSS %s Update(%d) failed: %s\n",
 650                                   gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 651                                   gensec_gssapi_state->gss_exchange_count,
 652                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 653                         return nt_status;
 654                 }
 655                 break;
 656         }
 657
 658         /* These last two stages are only done if we were invoked as SASL */
 659         case STAGE_SASL_SSF_NEG:
 660         {
 661                 switch (gensec_security->gensec_role) {
 662                 case GENSEC_CLIENT:
 663                 {
 664                         uint8_t maxlength_proposed[4];
 665                         uint8_t maxlength_accepted[4];
 666                         uint8_t security_supported;
 667                         int conf_state;
 668                         gss_qop_t qop_state;
 669                         input_token.length = in.length;
 670                         input_token.value = in.data;
 671
 672                         /* As a client, we have just send a
 673                          * zero-length blob to the server (after the
 674                          * normal GSSAPI exchange), and it has replied
 675                          * with it's SASL negotiation */
 676
 677                         maj_stat = gss_unwrap(&min_stat,
 678                                               gensec_gssapi_state->gssapi_context,
 679                                               &input_token,
 680                                               &output_token,
 681                                               &conf_state,
 682                                               &qop_state);
 683                         if (GSS_ERROR(maj_stat)) {
 684                                 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 685                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 686                                 return NT_STATUS_ACCESS_DENIED;
 687                         }
 688
 689                         if (output_token.length < 4) {
 690                                 return NT_STATUS_INVALID_PARAMETER;
 691                         }
 692
 693                         memcpy(maxlength_proposed, output_token.value, 4);
 694                         gss_release_buffer(&min_stat, &output_token);
 695
 696                         /* first byte is the proposed security */
 697                         security_supported = maxlength_proposed[0];
 698                         maxlength_proposed[0] = '\0';
 699
 700                         /* Rest is the proposed max wrap length */
 701                         gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
 702                                                                      gensec_gssapi_state->max_wrap_buf_size);
 703                         gensec_gssapi_state->sasl_protection = 0;
 704                         if (security_supported & NEG_SEAL) {
 705                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 706                                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 707                                 }
 708                         }
 709                         if (security_supported & NEG_SIGN) {
 710                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 711                                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 712                                 }
 713                         }
 714                         if (security_supported & NEG_NONE) {
 715                                 gensec_gssapi_state->sasl_protection |= NEG_NONE;
 716                         }
 717                         if (gensec_gssapi_state->sasl_protection == 0) {
 718                                 DEBUG(1, ("Remote server does not support unprotected connections\n"));
 719                                 return NT_STATUS_ACCESS_DENIED;
 720                         }
 721
 722                         /* Send back the negotiated max length */
 723
 724                         RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
 725
 726                         maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
 727
 728                         input_token.value = maxlength_accepted;
 729                         input_token.length = sizeof(maxlength_accepted);
 730
 731                         maj_stat = gss_wrap(&min_stat,
 732                                             gensec_gssapi_state->gssapi_context,
 733                                             false,
 734                                             GSS_C_QOP_DEFAULT,
 735                                             &input_token,
 736                                             &conf_state,
 737                                             &output_token);
 738                         if (GSS_ERROR(maj_stat)) {
 739                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 740                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 741                                 return NT_STATUS_ACCESS_DENIED;
 742                         }
 743
 744                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 745                         gss_release_buffer(&min_stat, &output_token);
 746
 747                         /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 748                         gensec_gssapi_state->sasl_state = STAGE_DONE;
 749
 750                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 751                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically sealed\n"));
 752                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 753                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically signed\n"));
 754                         } else {
 755                                 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographically protection\n"));
 756                         }
 757
 758                         return NT_STATUS_OK;
 759                 }
 760                 case GENSEC_SERVER:
 761                 {
 762                         uint8_t maxlength_proposed[4];
 763                         uint8_t security_supported = 0x0;
 764                         int conf_state;
 765
 766                         /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
 767                         if (in.length != 0) {
 768                                 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
 769                         }
 770
 771                         /* Give the client some idea what we will support */
 772
 773                         RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
 774                         /* first byte is the proposed security */
 775                         maxlength_proposed[0] = '\0';
 776
 777                         gensec_gssapi_state->sasl_protection = 0;
 778                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 779                                 security_supported |= NEG_SEAL;
 780                         }
 781                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 782                                 security_supported |= NEG_SIGN;
 783                         }
 784                         if (security_supported == 0) {
 785                                 /* If we don't support anything, this must be 0 */
 786                                 RSIVAL(maxlength_proposed, 0, 0x0);
 787                         }
 788
 789                         /* TODO:  We may not wish to support this */
 790                         security_supported |= NEG_NONE;
 791                         maxlength_proposed[0] = security_supported;
 792
 793                         input_token.value = maxlength_proposed;
 794                         input_token.length = sizeof(maxlength_proposed);
 795
 796                         maj_stat = gss_wrap(&min_stat,
 797                                             gensec_gssapi_state->gssapi_context,
 798                                             false,
 799                                             GSS_C_QOP_DEFAULT,
 800                                             &input_token,
 801                                             &conf_state,
 802                                             &output_token);
 803                         if (GSS_ERROR(maj_stat)) {
 804                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 805                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 806                                 return NT_STATUS_ACCESS_DENIED;
 807                         }
 808
 809                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 810                         gss_release_buffer(&min_stat, &output_token);
 811
 812                         gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
 813                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 814                 }
 815                 default:
 816                         return NT_STATUS_INVALID_PARAMETER;
 817
 818                 }
 819         }
 820         /* This is s server-only stage */
 821         case STAGE_SASL_SSF_ACCEPT:
 822         {
 823                 uint8_t maxlength_accepted[4];
 824                 uint8_t security_accepted;
 825                 int conf_state;
 826                 gss_qop_t qop_state;
 827                 input_token.length = in.length;
 828                 input_token.value = in.data;
 829
 830                 maj_stat = gss_unwrap(&min_stat,
 831                                       gensec_gssapi_state->gssapi_context,
 832                                       &input_token,
 833                                       &output_token,
 834                                       &conf_state,
 835                                       &qop_state);
 836                 if (GSS_ERROR(maj_stat)) {
 837                         DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 838                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 839                         return NT_STATUS_ACCESS_DENIED;
 840                 }
 841
 842                 if (output_token.length < 4) {
 843                         return NT_STATUS_INVALID_PARAMETER;
 844                 }
 845
 846                 memcpy(maxlength_accepted, output_token.value, 4);
 847                 gss_release_buffer(&min_stat, &output_token);
 848
 849                 /* first byte is the proposed security */
 850                 security_accepted = maxlength_accepted[0];
 851                 maxlength_accepted[0] = '\0';
 852
 853                 /* Rest is the proposed max wrap length */
 854                 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
 855                                                              gensec_gssapi_state->max_wrap_buf_size);
 856
 857                 gensec_gssapi_state->sasl_protection = 0;
 858                 if (security_accepted & NEG_SEAL) {
 859                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 860                                 DEBUG(1, ("Remote client wanted seal, but gensec refused\n"));
 861                                 return NT_STATUS_ACCESS_DENIED;
 862                         }
 863                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 864                 }
 865                 if (security_accepted & NEG_SIGN) {
 866                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 867                                 DEBUG(1, ("Remote client wanted sign, but gensec refused\n"));
 868                                 return NT_STATUS_ACCESS_DENIED;
 869                         }
 870                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 871                 }
 872                 if (security_accepted & NEG_NONE) {
 873                         gensec_gssapi_state->sasl_protection |= NEG_NONE;
 874                 }
 875
 876                 /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 877                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 878                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 879                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically sealed\n"));
 880                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 881                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically signed\n"));
 882                 } else {
 883                         DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
 884                 }
 885
 886                 *out = data_blob(NULL, 0);
 887                 return NT_STATUS_OK;
 888         }
 889         default:
 890                 return NT_STATUS_INVALID_PARAMETER;
 891         }
 892 }
 893
 894 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
 895                                    TALLOC_CTX *mem_ctx,
 896                                    const DATA_BLOB *in,
 897                                    DATA_BLOB *out)
 898 {
 899         struct gensec_gssapi_state *gensec_gssapi_state
 900                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 901         OM_uint32 maj_stat, min_stat;
 902         gss_buffer_desc input_token, output_token;
 903         int conf_state;
 904         input_token.length = in->length;
 905         input_token.value = in->data;
 906
 907         maj_stat = gss_wrap(&min_stat,
 908                             gensec_gssapi_state->gssapi_context,
 909                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 910                             GSS_C_QOP_DEFAULT,
 911                             &input_token,
 912                             &conf_state,
 913                             &output_token);
 914         if (GSS_ERROR(maj_stat)) {
 915                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 916                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 917                 return NT_STATUS_ACCESS_DENIED;
 918         }
 919
 920         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 921         gss_release_buffer(&min_stat, &output_token);
 922
 923         if (gensec_gssapi_state->sasl) {
 924                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 925                 if (max_wrapped_size < out->length) {
 926                         DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
 927                                   (unsigned)in->length,
 928                                   (unsigned)out->length,
 929                                   (unsigned int)max_wrapped_size));
 930                         return NT_STATUS_INVALID_PARAMETER;
 931                 }
 932         }
 933
 934         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 935             && !conf_state) {
 936                 return NT_STATUS_ACCESS_DENIED;
 937         }
 938         return NT_STATUS_OK;
 939 }
 940
 941 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
 942                                      TALLOC_CTX *mem_ctx,
 943                                      const DATA_BLOB *in,
 944                                      DATA_BLOB *out)
 945 {
 946         struct gensec_gssapi_state *gensec_gssapi_state
 947                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 948         OM_uint32 maj_stat, min_stat;
 949         gss_buffer_desc input_token, output_token;
 950         int conf_state;
 951         gss_qop_t qop_state;
 952         input_token.length = in->length;
 953         input_token.value = in->data;
 954
 955         if (gensec_gssapi_state->sasl) {
 956                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 957                 if (max_wrapped_size < in->length) {
 958                         DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
 959                         return NT_STATUS_INVALID_PARAMETER;
 960                 }
 961         }
 962
 963         maj_stat = gss_unwrap(&min_stat,
 964                               gensec_gssapi_state->gssapi_context,
 965                               &input_token,
 966                               &output_token,
 967                               &conf_state,
 968                               &qop_state);
 969         if (GSS_ERROR(maj_stat)) {
 970                 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
 971                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 972                 return NT_STATUS_ACCESS_DENIED;
 973         }
 974
 975         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 976         gss_release_buffer(&min_stat, &output_token);
 977
 978         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 979             && !conf_state) {
 980                 return NT_STATUS_ACCESS_DENIED;
 981         }
 982         return NT_STATUS_OK;
 983 }
 984
 985 /* Find out the maximum input size negotiated on this connection */
 986
 987 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
 988 {
 989         struct gensec_gssapi_state *gensec_gssapi_state
 990                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 991         OM_uint32 maj_stat, min_stat;
 992         OM_uint32 max_input_size;
 993
 994         maj_stat = gss_wrap_size_limit(&min_stat,
 995                                        gensec_gssapi_state->gssapi_context,
 996                                        gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 997                                        GSS_C_QOP_DEFAULT,
 998                                        gensec_gssapi_state->max_wrap_buf_size,
 999                                        &max_input_size);
1000         if (GSS_ERROR(maj_stat)) {
1001                 TALLOC_CTX *mem_ctx = talloc_new(NULL);
1002                 DEBUG(1, ("gensec_gssapi_max_input_size: determining signature size with gss_wrap_size_limit failed: %s\n",
1003                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1004                 talloc_free(mem_ctx);
1005                 return 0;
1006         }
1007
1008         return max_input_size;
1009 }
1010
1011 /* Find out the maximum output size negotiated on this connection */
1012 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
1013 {
1014         struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
1015         return gensec_gssapi_state->max_wrap_buf_size;
1016 }
1017
1018 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
1019                                           TALLOC_CTX *mem_ctx,
1020                                           uint8_t *data, size_t length,
1021                                           const uint8_t *whole_pdu, size_t pdu_length,
1022                                           DATA_BLOB *sig)
1023 {
1024         struct gensec_gssapi_state *gensec_gssapi_state
1025                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1026         OM_uint32 maj_stat, min_stat;
1027         gss_buffer_desc input_token, output_token;
1028         int conf_state;
1029         ssize_t sig_length;
1030
1031         input_token.length = length;
1032         input_token.value = data;
1033
1034         maj_stat = gss_wrap(&min_stat,
1035                             gensec_gssapi_state->gssapi_context,
1036                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
1037                             GSS_C_QOP_DEFAULT,
1038                             &input_token,
1039                             &conf_state,
1040                             &output_token);
1041         if (GSS_ERROR(maj_stat)) {
1042                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
1043                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1044                 return NT_STATUS_ACCESS_DENIED;
1045         }
1046
1047         if (output_token.length < input_token.length) {
1048                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
1049                           (long)output_token.length, (long)length));
1050                 return NT_STATUS_INTERNAL_ERROR;
1051         }
1052         sig_length = output_token.length - input_token.length;
1053
1054         memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
1055         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
1056
1057         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1058         dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
1059         dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
1060
1061         gss_release_buffer(&min_stat, &output_token);
1062
1063         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1064             && !conf_state) {
1065                 return NT_STATUS_ACCESS_DENIED;
1066         }
1067         return NT_STATUS_OK;
1068 }
1069
1070 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
1071                                             uint8_t *data, size_t length,
1072                                             const uint8_t *whole_pdu, size_t pdu_length,
1073                                             const DATA_BLOB *sig)
1074 {
1075         struct gensec_gssapi_state *gensec_gssapi_state
1076                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1077         OM_uint32 maj_stat, min_stat;
1078         gss_buffer_desc input_token, output_token;
1079         int conf_state;
1080         gss_qop_t qop_state;
1081         DATA_BLOB in;
1082
1083         dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
1084
1085         in = data_blob_talloc(gensec_security, NULL, sig->length + length);
1086
1087         memcpy(in.data, sig->data, sig->length);
1088         memcpy(in.data + sig->length, data, length);
1089
1090         input_token.length = in.length;
1091         input_token.value = in.data;
1092
1093         maj_stat = gss_unwrap(&min_stat,
1094                               gensec_gssapi_state->gssapi_context,
1095                               &input_token,
1096                               &output_token,
1097                               &conf_state,
1098                               &qop_state);
1099         talloc_free(in.data);
1100         if (GSS_ERROR(maj_stat)) {
1101                 char *error_string = gssapi_error_string(NULL, maj_stat, min_stat, gensec_gssapi_state->gss_oid);
1102                 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
1103                           error_string));
1104                 talloc_free(error_string);
1105                 return NT_STATUS_ACCESS_DENIED;
1106         }
1107
1108         if (output_token.length != length) {
1109                 return NT_STATUS_INTERNAL_ERROR;
1110         }
1111
1112         memcpy(data, output_token.value, length);
1113
1114         gss_release_buffer(&min_stat, &output_token);
1115
1116         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1117             && !conf_state) {
1118                 return NT_STATUS_ACCESS_DENIED;
1119         }
1120         return NT_STATUS_OK;
1121 }
1122
1123 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1124                                           TALLOC_CTX *mem_ctx,
1125                                           const uint8_t *data, size_t length,
1126                                           const uint8_t *whole_pdu, size_t pdu_length,
1127                                           DATA_BLOB *sig)
1128 {
1129         struct gensec_gssapi_state *gensec_gssapi_state
1130                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1131         OM_uint32 maj_stat, min_stat;
1132         gss_buffer_desc input_token, output_token;
1133
1134         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1135                 input_token.length = pdu_length;
1136                 input_token.value = discard_const_p(uint8_t *, whole_pdu);
1137         } else {
1138                 input_token.length = length;
1139                 input_token.value = discard_const_p(uint8_t *, data);
1140         }
1141
1142         maj_stat = gss_get_mic(&min_stat,
1143                             gensec_gssapi_state->gssapi_context,
1144                             GSS_C_QOP_DEFAULT,
1145                             &input_token,
1146                             &output_token);
1147         if (GSS_ERROR(maj_stat)) {
1148                 DEBUG(1, ("GSS GetMic failed: %s\n",
1149                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1150                 return NT_STATUS_ACCESS_DENIED;
1151         }
1152
1153         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, output_token.length);
1154
1155         dump_data_pw("gensec_gssapi_sign_packet: sig\n", sig->data, sig->length);
1156
1157         gss_release_buffer(&min_stat, &output_token);
1158
1159         return NT_STATUS_OK;
1160 }
1161
1162 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1163                                            const uint8_t *data, size_t length,
1164                                            const uint8_t *whole_pdu, size_t pdu_length,
1165                                            const DATA_BLOB *sig)
1166 {
1167         struct gensec_gssapi_state *gensec_gssapi_state
1168                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1169         OM_uint32 maj_stat, min_stat;
1170         gss_buffer_desc input_token;
1171         gss_buffer_desc input_message;
1172         gss_qop_t qop_state;
1173
1174         dump_data_pw("gensec_gssapi_check_packet: sig\n", sig->data, sig->length);
1175
1176         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1177                 input_message.length = pdu_length;
1178                 input_message.value = discard_const(whole_pdu);
1179         } else {
1180                 input_message.length = length;
1181                 input_message.value = discard_const(data);
1182         }
1183
1184         input_token.length = sig->length;
1185         input_token.value = sig->data;
1186
1187         maj_stat = gss_verify_mic(&min_stat,
1188                               gensec_gssapi_state->gssapi_context,
1189                               &input_message,
1190                               &input_token,
1191                               &qop_state);
1192         if (GSS_ERROR(maj_stat)) {
1193                 char *error_string = gssapi_error_string(NULL, maj_stat, min_stat, gensec_gssapi_state->gss_oid);
1194                 DEBUG(1, ("GSS VerifyMic failed: %s\n", error_string));
1195                 talloc_free(error_string);
1196
1197                 return NT_STATUS_ACCESS_DENIED;
1198         }
1199
1200         return NT_STATUS_OK;
1201 }
1202
1203 /* Try to figure out what features we actually got on the connection */
1204 static bool gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1205                                        uint32_t feature)
1206 {
1207         struct gensec_gssapi_state *gensec_gssapi_state
1208                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1209         if (feature & GENSEC_FEATURE_SIGN) {
1210                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1211                 if (gensec_gssapi_state->sasl
1212                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1213                         return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1214                                 && (gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG));
1215                 }
1216                 return gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG;
1217         }
1218         if (feature & GENSEC_FEATURE_SEAL) {
1219                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1220                 if (gensec_gssapi_state->sasl
1221                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1222                         return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1223                                  && (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG));
1224                 }
1225                 return gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG;
1226         }
1227         if (feature & GENSEC_FEATURE_SESSION_KEY) {
1228                 /* Only for GSSAPI/Krb5 */
1229                 if (smb_gss_oid_equal(gensec_gssapi_state->gss_oid,
1230                                       gss_mech_krb5)) {
1231                         return true;
1232                 }
1233         }
1234         if (feature & GENSEC_FEATURE_DCE_STYLE) {
1235                 return gensec_gssapi_state->gss_got_flags & GSS_C_DCE_STYLE;
1236         }
1237         if (feature & GENSEC_FEATURE_NEW_SPNEGO) {
1238                 NTSTATUS status;
1239                 uint32_t keytype;
1240
1241                 if (!(gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG)) {
1242                         return false;
1243                 }
1244
1245                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "force_new_spnego", false)) {
1246                         return true;
1247                 }
1248                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "disable_new_spnego", false)) {
1249                         return false;
1250                 }
1251
1252                 status = gssapi_get_session_key(gensec_gssapi_state,
1253                                                 gensec_gssapi_state->gssapi_context, NULL, &keytype);
1254                 /*
1255                  * We should do a proper sig on the mechListMic unless
1256                  * we know we have to be backwards compatible with
1257                  * earlier windows versions.
1258                  *
1259                  * Negotiating a non-krb5
1260                  * mech for example should be regarded as having
1261                  * NEW_SPNEGO
1262                  */
1263                 if (NT_STATUS_IS_OK(status)) {
1264                         switch (keytype) {
1265                         case ENCTYPE_DES_CBC_CRC:
1266                         case ENCTYPE_DES_CBC_MD5:
1267                         case ENCTYPE_ARCFOUR_HMAC:
1268                         case ENCTYPE_DES3_CBC_SHA1:
1269                                 return false;
1270                         }
1271                 }
1272                 return true;
1273         }
1274         /* We can always do async (rather than strict request/reply) packets.  */
1275         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1276                 return true;
1277         }
1278         return false;
1279 }
1280
1281 static NTTIME gensec_gssapi_expire_time(struct gensec_security *gensec_security)
1282 {
1283         struct gensec_gssapi_state *gensec_gssapi_state =
1284                 talloc_get_type_abort(gensec_security->private_data,
1285                 struct gensec_gssapi_state);
1286
1287         return gensec_gssapi_state->expire_time;
1288 }
1289
1290 /*
1291  * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1292  * (for encrypting some passwords).
1293  *
1294  * This breaks all the abstractions, but what do you expect...
1295  */
1296 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1297                                           TALLOC_CTX *mem_ctx,
1298                                           DATA_BLOB *session_key)
1299 {
1300         struct gensec_gssapi_state *gensec_gssapi_state
1301                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1302         return gssapi_get_session_key(mem_ctx, gensec_gssapi_state->gssapi_context, session_key, NULL);
1303 }
1304
1305 /* Get some basic (and authorization) information about the user on
1306  * this session.  This uses either the PAC (if present) or a local
1307  * database lookup */
1308 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1309                                            TALLOC_CTX *mem_ctx,
1310                                            struct auth_session_info **_session_info)
1311 {
1312         NTSTATUS nt_status;
1313         TALLOC_CTX *tmp_ctx;
1314         struct gensec_gssapi_state *gensec_gssapi_state
1315                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1316         struct auth_session_info *session_info = NULL;
1317         OM_uint32 maj_stat, min_stat;
1318         DATA_BLOB pac_blob, *pac_blob_ptr = NULL;
1319
1320         gss_buffer_desc name_token;
1321         char *principal_string;
1322
1323         tmp_ctx = talloc_named(mem_ctx, 0, "gensec_gssapi_session_info context");
1324         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
1325
1326         maj_stat = gss_display_name (&min_stat,
1327                                      gensec_gssapi_state->client_name,
1328                                      &name_token,
1329                                      NULL);
1330         if (GSS_ERROR(maj_stat)) {
1331                 DEBUG(1, ("GSS display_name failed: %s\n",
1332                           gssapi_error_string(tmp_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1333                 talloc_free(tmp_ctx);
1334                 return NT_STATUS_FOOBAR;
1335         }
1336
1337         principal_string = talloc_strndup(tmp_ctx,
1338                                           (const char *)name_token.value,
1339                                           name_token.length);
1340
1341         gss_release_buffer(&min_stat, &name_token);
1342
1343         if (!principal_string) {
1344                 talloc_free(tmp_ctx);
1345                 return NT_STATUS_NO_MEMORY;
1346         }
1347
1348         nt_status = gssapi_obtain_pac_blob(tmp_ctx,  gensec_gssapi_state->gssapi_context,
1349                                            gensec_gssapi_state->client_name,
1350                                            &pac_blob);
1351
1352         /* IF we have the PAC - otherwise we need to get this
1353          * data from elsewere - local ldb, or (TODO) lookup of some
1354          * kind...
1355          */
1356         if (NT_STATUS_IS_OK(nt_status)) {
1357                 pac_blob_ptr = &pac_blob;
1358         }
1359         nt_status = gensec_generate_session_info_pac(tmp_ctx,
1360                                                      gensec_security,
1361                                                      gensec_gssapi_state->smb_krb5_context,
1362                                                      pac_blob_ptr, principal_string,
1363                                                      gensec_get_remote_address(gensec_security),
1364                                                      &session_info);
1365         if (!NT_STATUS_IS_OK(nt_status)) {
1366                 talloc_free(tmp_ctx);
1367                 return nt_status;
1368         }
1369
1370         nt_status = gensec_gssapi_session_key(gensec_security, session_info, &session_info->session_key);
1371         if (!NT_STATUS_IS_OK(nt_status)) {
1372                 talloc_free(tmp_ctx);
1373                 return nt_status;
1374         }
1375
1376         if (!(gensec_gssapi_state->gss_got_flags & GSS_C_DELEG_FLAG)) {
1377                 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1378         } else {
1379                 krb5_error_code ret;
1380                 const char *error_string;
1381
1382                 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1383                 session_info->credentials = cli_credentials_init(session_info);
1384                 if (!session_info->credentials) {
1385                         talloc_free(tmp_ctx);
1386                         return NT_STATUS_NO_MEMORY;
1387                 }
1388
1389                 cli_credentials_set_conf(session_info->credentials, gensec_security->settings->lp_ctx);
1390                 /* Just so we don't segfault trying to get at a username */
1391                 cli_credentials_set_anonymous(session_info->credentials);
1392
1393                 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1394                                                            gensec_security->settings->lp_ctx,
1395                                                            gensec_gssapi_state->delegated_cred_handle,
1396                                                            CRED_SPECIFIED, &error_string);
1397                 if (ret) {
1398                         talloc_free(tmp_ctx);
1399                         DEBUG(2,("Failed to get gss creds: %s\n", error_string));
1400                         return NT_STATUS_NO_MEMORY;
1401                 }
1402
1403                 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1404                 cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
1405
1406                 /* It has been taken from this place... */
1407                 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1408         }
1409         *_session_info = talloc_steal(mem_ctx, session_info);
1410         talloc_free(tmp_ctx);
1411
1412         return NT_STATUS_OK;
1413 }
1414
1415 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
1416 {
1417         struct gensec_gssapi_state *gensec_gssapi_state
1418                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1419         NTSTATUS status;
1420
1421         if (gensec_gssapi_state->sig_size) {
1422                 return gensec_gssapi_state->sig_size;
1423         }
1424
1425         if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1426                 gensec_gssapi_state->sig_size = 45;
1427         } else {
1428                 gensec_gssapi_state->sig_size = 37;
1429         }
1430
1431         status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1432         if (!NT_STATUS_IS_OK(status)) {
1433                 return gensec_gssapi_state->sig_size;
1434         }
1435
1436         if (gensec_gssapi_state->lucid->protocol == 1) {
1437                 if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1438                         /*
1439                          * TODO: windows uses 76 here, but we don't know
1440                          *       gss_wrap works with aes keys yet
1441                          */
1442                         gensec_gssapi_state->sig_size = 76;
1443                 } else {
1444                         gensec_gssapi_state->sig_size = 28;
1445                 }
1446         } else if (gensec_gssapi_state->lucid->protocol == 0) {
1447                 switch (gensec_gssapi_state->lucid->rfc1964_kd.ctx_key.type) {
1448                 case ENCTYPE_DES_CBC_CRC:
1449                 case ENCTYPE_ARCFOUR_HMAC:
1450                 case ENCTYPE_ARCFOUR_HMAC_EXP:
1451                         if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1452                                 gensec_gssapi_state->sig_size = 45;
1453                         } else {
1454                                 gensec_gssapi_state->sig_size = 37;
1455                         }
1456                         break;
1457 #ifdef SAMBA4_USES_HEIMDAL
1458                 case ENCTYPE_OLD_DES3_CBC_SHA1:
1459                         if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1460                                 gensec_gssapi_state->sig_size = 57;
1461                         } else {
1462                                 gensec_gssapi_state->sig_size = 49;
1463                         }
1464                         break;
1465 #endif
1466                 }
1467         }
1468
1469         return gensec_gssapi_state->sig_size;
1470 }
1471
1472 static const char *gensec_gssapi_krb5_oids[] = {
1473         GENSEC_OID_KERBEROS5_OLD,
1474         GENSEC_OID_KERBEROS5,
1475         NULL
1476 };
1477
1478 static const char *gensec_gssapi_spnego_oids[] = {
1479         GENSEC_OID_SPNEGO,
1480         NULL
1481 };
1482
1483 /* As a server, this could in theory accept any GSSAPI mech */
1484 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1485         .name           = "gssapi_spnego",
1486         .sasl_name      = "GSS-SPNEGO",
1487         .auth_type      = DCERPC_AUTH_TYPE_SPNEGO,
1488         .oid            = gensec_gssapi_spnego_oids,
1489         .client_start   = gensec_gssapi_client_start,
1490         .server_start   = gensec_gssapi_server_start,
1491         .magic          = gensec_magic_check_krb5_oid,
1492         .update         = gensec_gssapi_update,
1493         .session_key    = gensec_gssapi_session_key,
1494         .session_info   = gensec_gssapi_session_info,
1495         .sign_packet    = gensec_gssapi_sign_packet,
1496         .check_packet   = gensec_gssapi_check_packet,
1497         .seal_packet    = gensec_gssapi_seal_packet,
1498         .unseal_packet  = gensec_gssapi_unseal_packet,
1499         .wrap           = gensec_gssapi_wrap,
1500         .unwrap         = gensec_gssapi_unwrap,
1501         .have_feature   = gensec_gssapi_have_feature,
1502         .expire_time    = gensec_gssapi_expire_time,
1503         .enabled        = false,
1504         .kerberos       = true,
1505         .priority       = GENSEC_GSSAPI
1506 };
1507
1508 /* As a server, this could in theory accept any GSSAPI mech */
1509 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1510         .name           = "gssapi_krb5",
1511         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
1512         .oid            = gensec_gssapi_krb5_oids,
1513         .client_start   = gensec_gssapi_client_start,
1514         .server_start   = gensec_gssapi_server_start,
1515         .magic          = gensec_magic_check_krb5_oid,
1516         .update         = gensec_gssapi_update,
1517         .session_key    = gensec_gssapi_session_key,
1518         .session_info   = gensec_gssapi_session_info,
1519         .sig_size       = gensec_gssapi_sig_size,
1520         .sign_packet    = gensec_gssapi_sign_packet,
1521         .check_packet   = gensec_gssapi_check_packet,
1522         .seal_packet    = gensec_gssapi_seal_packet,
1523         .unseal_packet  = gensec_gssapi_unseal_packet,
1524         .wrap           = gensec_gssapi_wrap,
1525         .unwrap         = gensec_gssapi_unwrap,
1526         .have_feature   = gensec_gssapi_have_feature,
1527         .expire_time    = gensec_gssapi_expire_time,
1528         .enabled        = true,
1529         .kerberos       = true,
1530         .priority       = GENSEC_GSSAPI
1531 };
1532
1533 /* As a server, this could in theory accept any GSSAPI mech */
1534 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1535         .name             = "gssapi_krb5_sasl",
1536         .sasl_name        = "GSSAPI",
1537         .client_start     = gensec_gssapi_sasl_client_start,
1538         .server_start     = gensec_gssapi_sasl_server_start,
1539         .update           = gensec_gssapi_update,
1540         .session_key      = gensec_gssapi_session_key,
1541         .session_info     = gensec_gssapi_session_info,
1542         .max_input_size   = gensec_gssapi_max_input_size,
1543         .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1544         .wrap             = gensec_gssapi_wrap,
1545         .unwrap           = gensec_gssapi_unwrap,
1546         .have_feature     = gensec_gssapi_have_feature,
1547         .expire_time      = gensec_gssapi_expire_time,
1548         .enabled          = true,
1549         .kerberos         = true,
1550         .priority         = GENSEC_GSSAPI
1551 };
1552
1553 _PUBLIC_ NTSTATUS gensec_gssapi_init(void)
1554 {
1555         NTSTATUS ret;
1556
1557         ret = gensec_register(&gensec_gssapi_spnego_security_ops);
1558         if (!NT_STATUS_IS_OK(ret)) {
1559                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1560                         gensec_gssapi_spnego_security_ops.name));
1561                 return ret;
1562         }
1563
1564         ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1565         if (!NT_STATUS_IS_OK(ret)) {
1566                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1567                         gensec_gssapi_krb5_security_ops.name));
1568                 return ret;
1569         }
1570
1571         ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1572         if (!NT_STATUS_IS_OK(ret)) {
1573                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1574                         gensec_gssapi_sasl_krb5_security_ops.name));
1575                 return ret;
1576         }
1577
1578         return ret;
1579 }