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 "auth/kerberos/kerberos.h"
  28 #include "librpc/gen_ndr/krb5pac.h"
  29 #include "auth/auth.h"
  30 #include "lib/ldb/include/ldb.h"
  31 #include "auth/auth_sam.h"
  32 #include "librpc/rpc/dcerpc.h"
  33 #include "auth/credentials/credentials.h"
  34 #include "auth/credentials/credentials_krb5.h"
  35 #include "auth/gensec/gensec.h"
  36 #include "auth/gensec/gensec_proto.h"
  37 #include "param/param.h"
  38 #include "auth/session_proto.h"
  39 #include <gssapi/gssapi.h>
  40 #include <gssapi/gssapi_krb5.h>
  41 #include <gssapi/gssapi_spnego.h>
  42 #include "auth/gensec/gensec_gssapi.h"
  43 #include "lib/util/util_net.h"
  44
  45 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security);
  46 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security);
  47
  48 static char *gssapi_error_string(TALLOC_CTX *mem_ctx,
  49                                  OM_uint32 maj_stat, OM_uint32 min_stat,
  50                                  const gss_OID mech)
  51 {
  52         OM_uint32 disp_min_stat, disp_maj_stat;
  53         gss_buffer_desc maj_error_message;
  54         gss_buffer_desc min_error_message;
  55         char *maj_error_string, *min_error_string;
  56         OM_uint32 msg_ctx = 0;
  57
  58         char *ret;
  59
  60         maj_error_message.value = NULL;
  61         min_error_message.value = NULL;
  62         maj_error_message.length = 0;
  63         min_error_message.length = 0;
  64
  65         disp_maj_stat = gss_display_status(&disp_min_stat, maj_stat, GSS_C_GSS_CODE,
  66                            mech, &msg_ctx, &maj_error_message);
  67         disp_maj_stat = gss_display_status(&disp_min_stat, min_stat, GSS_C_MECH_CODE,
  68                            mech, &msg_ctx, &min_error_message);
  69
  70         maj_error_string = talloc_strndup(mem_ctx, (char *)maj_error_message.value, maj_error_message.length);
  71
  72         min_error_string = talloc_strndup(mem_ctx, (char *)min_error_message.value, min_error_message.length);
  73
  74         ret = talloc_asprintf(mem_ctx, "%s: %s", maj_error_string, min_error_string);
  75
  76         talloc_free(maj_error_string);
  77         talloc_free(min_error_string);
  78
  79         gss_release_buffer(&disp_min_stat, &maj_error_message);
  80         gss_release_buffer(&disp_min_stat, &min_error_message);
  81
  82         return ret;
  83 }
  84
  85
  86 static int gensec_gssapi_destructor(struct gensec_gssapi_state *gensec_gssapi_state)
  87 {
  88         OM_uint32 maj_stat, min_stat;
  89
  90         if (gensec_gssapi_state->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
  91                 maj_stat = gss_release_cred(&min_stat,
  92                                             &gensec_gssapi_state->delegated_cred_handle);
  93         }
  94
  95         if (gensec_gssapi_state->gssapi_context != GSS_C_NO_CONTEXT) {
  96                 maj_stat = gss_delete_sec_context (&min_stat,
  97                                                    &gensec_gssapi_state->gssapi_context,
  98                                                    GSS_C_NO_BUFFER);
  99         }
 100
 101         if (gensec_gssapi_state->server_name != GSS_C_NO_NAME) {
 102                 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->server_name);
 103         }
 104         if (gensec_gssapi_state->client_name != GSS_C_NO_NAME) {
 105                 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->client_name);
 106         }
 107
 108         if (gensec_gssapi_state->lucid) {
 109                 gss_krb5_free_lucid_sec_context(&min_stat, gensec_gssapi_state->lucid);
 110         }
 111
 112         return 0;
 113 }
 114
 115 static NTSTATUS gensec_gssapi_init_lucid(struct gensec_gssapi_state *gensec_gssapi_state)
 116 {
 117         OM_uint32 maj_stat, min_stat;
 118
 119         if (gensec_gssapi_state->lucid) {
 120                 return NT_STATUS_OK;
 121         }
 122
 123         maj_stat = gss_krb5_export_lucid_sec_context(&min_stat,
 124                                                      &gensec_gssapi_state->gssapi_context,
 125                                                      1,
 126                                                      (void **)&gensec_gssapi_state->lucid);
 127         if (maj_stat != GSS_S_COMPLETE) {
 128                 DEBUG(0,("gensec_gssapi_init_lucid: %s\n",
 129                         gssapi_error_string(gensec_gssapi_state,
 130                                             maj_stat, min_stat,
 131                                             gensec_gssapi_state->gss_oid)));
 132                 return NT_STATUS_INTERNAL_ERROR;
 133         }
 134
 135         if (gensec_gssapi_state->lucid->version != 1) {
 136                 DEBUG(0,("gensec_gssapi_init_lucid: lucid version[%d] != 1\n",
 137                         gensec_gssapi_state->lucid->version));
 138                 gss_krb5_free_lucid_sec_context(&min_stat, gensec_gssapi_state->lucid);
 139                 gensec_gssapi_state->lucid = NULL;
 140                 return NT_STATUS_INTERNAL_ERROR;
 141         }
 142
 143         return NT_STATUS_OK;
 144 }
 145
 146 static NTSTATUS gensec_gssapi_start(struct gensec_security *gensec_security)
 147 {
 148         struct gensec_gssapi_state *gensec_gssapi_state;
 149         krb5_error_code ret;
 150         const char *realm;
 151
 152         gensec_gssapi_state = talloc_zero(gensec_security, struct gensec_gssapi_state);
 153         if (!gensec_gssapi_state) {
 154                 return NT_STATUS_NO_MEMORY;
 155         }
 156
 157         gensec_security->private_data = gensec_gssapi_state;
 158
 159         gensec_gssapi_state->gssapi_context = GSS_C_NO_CONTEXT;
 160
 161         /* TODO: Fill in channel bindings */
 162         gensec_gssapi_state->input_chan_bindings = GSS_C_NO_CHANNEL_BINDINGS;
 163
 164         gensec_gssapi_state->server_name = GSS_C_NO_NAME;
 165         gensec_gssapi_state->client_name = GSS_C_NO_NAME;
 166
 167         gensec_gssapi_state->want_flags = 0;
 168
 169         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation_by_kdc_policy", true)) {
 170                 gensec_gssapi_state->want_flags |= GSS_C_DELEG_POLICY_FLAG;
 171         }
 172         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "mutual", true)) {
 173                 gensec_gssapi_state->want_flags |= GSS_C_MUTUAL_FLAG;
 174         }
 175         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation", true)) {
 176                 gensec_gssapi_state->want_flags |= GSS_C_DELEG_FLAG;
 177         }
 178         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "replay", true)) {
 179                 gensec_gssapi_state->want_flags |= GSS_C_REPLAY_FLAG;
 180         }
 181         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "sequence", true)) {
 182                 gensec_gssapi_state->want_flags |= GSS_C_SEQUENCE_FLAG;
 183         }
 184
 185         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 186                 gensec_gssapi_state->want_flags |= GSS_C_INTEG_FLAG;
 187         }
 188         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 189                 gensec_gssapi_state->want_flags |= GSS_C_CONF_FLAG;
 190         }
 191         if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
 192                 gensec_gssapi_state->want_flags |= GSS_C_DCE_STYLE;
 193         }
 194
 195         gensec_gssapi_state->got_flags = 0;
 196
 197         switch (gensec_security->ops->auth_type) {
 198         case DCERPC_AUTH_TYPE_SPNEGO:
 199                 gensec_gssapi_state->gss_oid = gss_mech_spnego;
 200                 break;
 201         case DCERPC_AUTH_TYPE_KRB5:
 202         default:
 203                 gensec_gssapi_state->gss_oid = gss_mech_krb5;
 204                 break;
 205         }
 206
 207         gensec_gssapi_state->session_key = data_blob(NULL, 0);
 208         gensec_gssapi_state->pac = data_blob(NULL, 0);
 209
 210         ret = smb_krb5_init_context(gensec_gssapi_state,
 211                                     NULL,
 212                                     gensec_security->settings->lp_ctx,
 213                                     &gensec_gssapi_state->smb_krb5_context);
 214         if (ret) {
 215                 DEBUG(1,("gensec_krb5_start: krb5_init_context failed (%s)\n",
 216                          error_message(ret)));
 217                 talloc_free(gensec_gssapi_state);
 218                 return NT_STATUS_INTERNAL_ERROR;
 219         }
 220
 221         gensec_gssapi_state->client_cred = NULL;
 222         gensec_gssapi_state->server_cred = NULL;
 223
 224         gensec_gssapi_state->lucid = NULL;
 225
 226         gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
 227
 228         gensec_gssapi_state->sasl = false;
 229         gensec_gssapi_state->sasl_state = STAGE_GSS_NEG;
 230         gensec_gssapi_state->sasl_protection = 0;
 231
 232         gensec_gssapi_state->max_wrap_buf_size
 233                 = gensec_setting_int(gensec_security->settings, "gensec_gssapi", "max wrap buf size", 65536);
 234         gensec_gssapi_state->gss_exchange_count = 0;
 235         gensec_gssapi_state->sig_size = 0;
 236
 237         talloc_set_destructor(gensec_gssapi_state, gensec_gssapi_destructor);
 238
 239         realm = lpcfg_realm(gensec_security->settings->lp_ctx);
 240         if (realm != NULL) {
 241                 ret = gsskrb5_set_default_realm(realm);
 242                 if (ret) {
 243                         DEBUG(1,("gensec_krb5_start: gsskrb5_set_default_realm failed\n"));
 244                         talloc_free(gensec_gssapi_state);
 245                         return NT_STATUS_INTERNAL_ERROR;
 246                 }
 247         }
 248
 249         /* don't do DNS lookups of any kind, it might/will fail for a netbios name */
 250         ret = gsskrb5_set_dns_canonicalize(gensec_setting_bool(gensec_security->settings, "krb5", "set_dns_canonicalize", false));
 251         if (ret) {
 252                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_dns_canonicalize failed\n"));
 253                 talloc_free(gensec_gssapi_state);
 254                 return NT_STATUS_INTERNAL_ERROR;
 255         }
 256
 257         return NT_STATUS_OK;
 258 }
 259
 260 static NTSTATUS gensec_gssapi_server_start(struct gensec_security *gensec_security)
 261 {
 262         NTSTATUS nt_status;
 263         int ret;
 264         struct gensec_gssapi_state *gensec_gssapi_state;
 265         struct cli_credentials *machine_account;
 266         struct gssapi_creds_container *gcc;
 267
 268         nt_status = gensec_gssapi_start(gensec_security);
 269         if (!NT_STATUS_IS_OK(nt_status)) {
 270                 return nt_status;
 271         }
 272
 273         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 274
 275         machine_account = gensec_get_credentials(gensec_security);
 276
 277         if (!machine_account) {
 278                 DEBUG(3, ("No machine account credentials specified\n"));
 279                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 280         } else {
 281                 ret = cli_credentials_get_server_gss_creds(machine_account,
 282                                                            gensec_security->settings->lp_ctx, &gcc);
 283                 if (ret) {
 284                         DEBUG(1, ("Aquiring acceptor credentials failed: %s\n",
 285                                   error_message(ret)));
 286                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 287                 }
 288         }
 289
 290         gensec_gssapi_state->server_cred = gcc;
 291         return NT_STATUS_OK;
 292
 293 }
 294
 295 static NTSTATUS gensec_gssapi_sasl_server_start(struct gensec_security *gensec_security)
 296 {
 297         NTSTATUS nt_status;
 298         struct gensec_gssapi_state *gensec_gssapi_state;
 299         nt_status = gensec_gssapi_server_start(gensec_security);
 300
 301         if (NT_STATUS_IS_OK(nt_status)) {
 302                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 303                 gensec_gssapi_state->sasl = true;
 304         }
 305         return nt_status;
 306 }
 307
 308 static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_security)
 309 {
 310         struct gensec_gssapi_state *gensec_gssapi_state;
 311         struct cli_credentials *creds = gensec_get_credentials(gensec_security);
 312         krb5_error_code ret;
 313         NTSTATUS nt_status;
 314         gss_buffer_desc name_token;
 315         gss_OID name_type;
 316         OM_uint32 maj_stat, min_stat;
 317         const char *hostname = gensec_get_target_hostname(gensec_security);
 318         struct gssapi_creds_container *gcc;
 319         const char *error_string;
 320
 321         if (!hostname) {
 322                 DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
 323                 return NT_STATUS_INVALID_PARAMETER;
 324         }
 325         if (is_ipaddress(hostname)) {
 326                 DEBUG(2, ("Cannot do GSSAPI to an IP address\n"));
 327                 return NT_STATUS_INVALID_PARAMETER;
 328         }
 329         if (strcmp(hostname, "localhost") == 0) {
 330                 DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
 331                 return NT_STATUS_INVALID_PARAMETER;
 332         }
 333
 334         nt_status = gensec_gssapi_start(gensec_security);
 335         if (!NT_STATUS_IS_OK(nt_status)) {
 336                 return nt_status;
 337         }
 338
 339         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 340
 341         gensec_gssapi_state->target_principal = gensec_get_target_principal(gensec_security);
 342         if (gensec_gssapi_state->target_principal) {
 343                 name_type = GSS_C_NULL_OID;
 344         } else {
 345                 gensec_gssapi_state->target_principal = talloc_asprintf(gensec_gssapi_state, "%s/%s@%s",
 346                                             gensec_get_target_service(gensec_security),
 347                                             hostname, lpcfg_realm(gensec_security->settings->lp_ctx));
 348
 349                 name_type = GSS_C_NT_USER_NAME;
 350         }
 351         name_token.value  = discard_const_p(uint8_t, gensec_gssapi_state->target_principal);
 352         name_token.length = strlen(gensec_gssapi_state->target_principal);
 353
 354
 355         maj_stat = gss_import_name (&min_stat,
 356                                     &name_token,
 357                                     name_type,
 358                                     &gensec_gssapi_state->server_name);
 359         if (maj_stat) {
 360                 DEBUG(2, ("GSS Import name of %s failed: %s\n",
 361                           (char *)name_token.value,
 362                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 363                 return NT_STATUS_INVALID_PARAMETER;
 364         }
 365
 366         ret = cli_credentials_get_client_gss_creds(creds,
 367                                                    gensec_security->event_ctx,
 368                                                    gensec_security->settings->lp_ctx, &gcc, &error_string);
 369         switch (ret) {
 370         case 0:
 371                 break;
 372         case KRB5KDC_ERR_PREAUTH_FAILED:
 373         case KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN:
 374                 DEBUG(1, ("Wrong username or password: %s\n", error_string));
 375                 return NT_STATUS_LOGON_FAILURE;
 376         case KRB5_KDC_UNREACH:
 377                 DEBUG(3, ("Cannot reach a KDC we require to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
 378                 return NT_STATUS_NO_LOGON_SERVERS;
 379         case KRB5_CC_NOTFOUND:
 380         case KRB5_CC_END:
 381                 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));
 382                 return NT_STATUS_TIME_DIFFERENCE_AT_DC;
 383         default:
 384                 DEBUG(1, ("Aquiring initiator credentials failed: %s\n", error_string));
 385                 return NT_STATUS_UNSUCCESSFUL;
 386         }
 387
 388         gensec_gssapi_state->client_cred = gcc;
 389         if (!talloc_reference(gensec_gssapi_state, gcc)) {
 390                 return NT_STATUS_NO_MEMORY;
 391         }
 392
 393         return NT_STATUS_OK;
 394 }
 395
 396 static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
 397 {
 398         NTSTATUS nt_status;
 399         struct gensec_gssapi_state *gensec_gssapi_state;
 400         nt_status = gensec_gssapi_client_start(gensec_security);
 401
 402         if (NT_STATUS_IS_OK(nt_status)) {
 403                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 404                 gensec_gssapi_state->sasl = true;
 405         }
 406         return nt_status;
 407 }
 408
 409
 410 /**
 411  * Check if the packet is one for this mechansim
 412  *
 413  * @param gensec_security GENSEC state
 414  * @param in The request, as a DATA_BLOB
 415  * @return Error, INVALID_PARAMETER if it's not a packet for us
 416  *                or NT_STATUS_OK if the packet is ok.
 417  */
 418
 419 static NTSTATUS gensec_gssapi_magic(struct gensec_security *gensec_security,
 420                                     const DATA_BLOB *in)
 421 {
 422         if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
 423                 return NT_STATUS_OK;
 424         } else {
 425                 return NT_STATUS_INVALID_PARAMETER;
 426         }
 427 }
 428
 429
 430 /**
 431  * Next state function for the GSSAPI GENSEC mechanism
 432  *
 433  * @param gensec_gssapi_state GSSAPI State
 434  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 435  * @param in The request, as a DATA_BLOB
 436  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 437  * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
 438  *                or NT_STATUS_OK if the user is authenticated.
 439  */
 440
 441 static NTSTATUS gensec_gssapi_update(struct gensec_security *gensec_security,
 442                                    TALLOC_CTX *out_mem_ctx,
 443                                    const DATA_BLOB in, DATA_BLOB *out)
 444 {
 445         struct gensec_gssapi_state *gensec_gssapi_state
 446                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 447         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 448         OM_uint32 maj_stat, min_stat;
 449         OM_uint32 min_stat2;
 450         gss_buffer_desc input_token, output_token;
 451         gss_OID gss_oid_p = NULL;
 452         input_token.length = in.length;
 453         input_token.value = in.data;
 454
 455         switch (gensec_gssapi_state->sasl_state) {
 456         case STAGE_GSS_NEG:
 457         {
 458                 switch (gensec_security->gensec_role) {
 459                 case GENSEC_CLIENT:
 460                 {
 461                         struct gsskrb5_send_to_kdc send_to_kdc;
 462                         krb5_error_code ret;
 463                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 464                         send_to_kdc.ptr = gensec_security->event_ctx;
 465
 466                         min_stat = gsskrb5_set_send_to_kdc(&send_to_kdc);
 467                         if (min_stat) {
 468                                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
 469                                 return NT_STATUS_INTERNAL_ERROR;
 470                         }
 471
 472                         maj_stat = gss_init_sec_context(&min_stat,
 473                                                         gensec_gssapi_state->client_cred->creds,
 474                                                         &gensec_gssapi_state->gssapi_context,
 475                                                         gensec_gssapi_state->server_name,
 476                                                         gensec_gssapi_state->gss_oid,
 477                                                         gensec_gssapi_state->want_flags,
 478                                                         0,
 479                                                         gensec_gssapi_state->input_chan_bindings,
 480                                                         &input_token,
 481                                                         &gss_oid_p,
 482                                                         &output_token,
 483                                                         &gensec_gssapi_state->got_flags, /* ret flags */
 484                                                         NULL);
 485                         if (gss_oid_p) {
 486                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 487                         }
 488
 489                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 490                         send_to_kdc.ptr = NULL;
 491
 492                         ret = gsskrb5_set_send_to_kdc(&send_to_kdc);
 493                         if (ret) {
 494                                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
 495                                 return NT_STATUS_INTERNAL_ERROR;
 496                         }
 497
 498                         break;
 499                 }
 500                 case GENSEC_SERVER:
 501                 {
 502                         maj_stat = gss_accept_sec_context(&min_stat,
 503                                                           &gensec_gssapi_state->gssapi_context,
 504                                                           gensec_gssapi_state->server_cred->creds,
 505                                                           &input_token,
 506                                                           gensec_gssapi_state->input_chan_bindings,
 507                                                           &gensec_gssapi_state->client_name,
 508                                                           &gss_oid_p,
 509                                                           &output_token,
 510                                                           &gensec_gssapi_state->got_flags,
 511                                                           NULL,
 512                                                           &gensec_gssapi_state->delegated_cred_handle);
 513                         if (gss_oid_p) {
 514                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 515                         }
 516                         break;
 517                 }
 518                 default:
 519                         return NT_STATUS_INVALID_PARAMETER;
 520
 521                 }
 522
 523                 gensec_gssapi_state->gss_exchange_count++;
 524
 525                 if (maj_stat == GSS_S_COMPLETE) {
 526                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 527                         gss_release_buffer(&min_stat2, &output_token);
 528
 529                         if (gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG) {
 530                                 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
 531                         } else {
 532                                 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
 533                         }
 534
 535                         /* We may have been invoked as SASL, so there
 536                          * is more work to do */
 537                         if (gensec_gssapi_state->sasl) {
 538                                 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
 539                                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 540                         } else {
 541                                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 542
 543                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 544                                         DEBUG(5, ("GSSAPI Connection will be cryptographically sealed\n"));
 545                                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 546                                         DEBUG(5, ("GSSAPI Connection will be cryptographically signed\n"));
 547                                 } else {
 548                                         DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
 549                                 }
 550
 551                                 return NT_STATUS_OK;
 552                         }
 553                 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
 554                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 555                         gss_release_buffer(&min_stat2, &output_token);
 556
 557                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 558                 } else if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
 559                         switch (min_stat) {
 560                         case KRB5KRB_AP_ERR_TKT_NYV:
 561                                 DEBUG(1, ("Error with ticket to contact %s: possible clock skew between us and the KDC or target server: %s\n",
 562                                           gensec_gssapi_state->target_principal,
 563                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 564                                 return NT_STATUS_TIME_DIFFERENCE_AT_DC; /* Make SPNEGO ignore us, we can't go any further here */
 565                         case KRB5KRB_AP_ERR_TKT_EXPIRED:
 566                                 DEBUG(1, ("Error with ticket to contact %s: ticket is expired, possible clock skew between us and the KDC or target server: %s\n",
 567                                           gensec_gssapi_state->target_principal,
 568                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 569                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 570                         case KRB5_KDC_UNREACH:
 571                                 DEBUG(3, ("Cannot reach a KDC we require in order to obtain a ticetk to %s: %s\n",
 572                                           gensec_gssapi_state->target_principal,
 573                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 574                                 return NT_STATUS_NO_LOGON_SERVERS; /* Make SPNEGO ignore us, we can't go any further here */
 575                         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 576                                 DEBUG(3, ("Server %s is not registered with our KDC: %s\n",
 577                                           gensec_gssapi_state->target_principal,
 578                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 579                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 580                         case KRB5KRB_AP_ERR_MSG_TYPE:
 581                                 /* garbage input, possibly from the auto-mech detection */
 582                                 return NT_STATUS_INVALID_PARAMETER;
 583                         default:
 584                                 DEBUG(1, ("GSS %s Update(krb5)(%d) Update failed: %s\n",
 585                                           gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 586                                           gensec_gssapi_state->gss_exchange_count,
 587                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 588                                 return nt_status;
 589                         }
 590                 } else {
 591                         DEBUG(1, ("GSS %s Update(%d) failed: %s\n",
 592                                   gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 593                                   gensec_gssapi_state->gss_exchange_count,
 594                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 595                         return nt_status;
 596                 }
 597                 break;
 598         }
 599
 600         /* These last two stages are only done if we were invoked as SASL */
 601         case STAGE_SASL_SSF_NEG:
 602         {
 603                 switch (gensec_security->gensec_role) {
 604                 case GENSEC_CLIENT:
 605                 {
 606                         uint8_t maxlength_proposed[4];
 607                         uint8_t maxlength_accepted[4];
 608                         uint8_t security_supported;
 609                         int conf_state;
 610                         gss_qop_t qop_state;
 611                         input_token.length = in.length;
 612                         input_token.value = in.data;
 613
 614                         /* As a client, we have just send a
 615                          * zero-length blob to the server (after the
 616                          * normal GSSAPI exchange), and it has replied
 617                          * with it's SASL negotiation */
 618
 619                         maj_stat = gss_unwrap(&min_stat,
 620                                               gensec_gssapi_state->gssapi_context,
 621                                               &input_token,
 622                                               &output_token,
 623                                               &conf_state,
 624                                               &qop_state);
 625                         if (GSS_ERROR(maj_stat)) {
 626                                 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 627                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 628                                 return NT_STATUS_ACCESS_DENIED;
 629                         }
 630
 631                         if (output_token.length < 4) {
 632                                 return NT_STATUS_INVALID_PARAMETER;
 633                         }
 634
 635                         memcpy(maxlength_proposed, output_token.value, 4);
 636                         gss_release_buffer(&min_stat, &output_token);
 637
 638                         /* first byte is the proposed security */
 639                         security_supported = maxlength_proposed[0];
 640                         maxlength_proposed[0] = '\0';
 641
 642                         /* Rest is the proposed max wrap length */
 643                         gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
 644                                                                      gensec_gssapi_state->max_wrap_buf_size);
 645                         gensec_gssapi_state->sasl_protection = 0;
 646                         if (security_supported & NEG_SEAL) {
 647                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 648                                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 649                                 }
 650                         }
 651                         if (security_supported & NEG_SIGN) {
 652                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 653                                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 654                                 }
 655                         }
 656                         if (security_supported & NEG_NONE) {
 657                                 gensec_gssapi_state->sasl_protection |= NEG_NONE;
 658                         }
 659                         if (gensec_gssapi_state->sasl_protection == 0) {
 660                                 DEBUG(1, ("Remote server does not support unprotected connections\n"));
 661                                 return NT_STATUS_ACCESS_DENIED;
 662                         }
 663
 664                         /* Send back the negotiated max length */
 665
 666                         RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
 667
 668                         maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
 669
 670                         input_token.value = maxlength_accepted;
 671                         input_token.length = sizeof(maxlength_accepted);
 672
 673                         maj_stat = gss_wrap(&min_stat,
 674                                             gensec_gssapi_state->gssapi_context,
 675                                             false,
 676                                             GSS_C_QOP_DEFAULT,
 677                                             &input_token,
 678                                             &conf_state,
 679                                             &output_token);
 680                         if (GSS_ERROR(maj_stat)) {
 681                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 682                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 683                                 return NT_STATUS_ACCESS_DENIED;
 684                         }
 685
 686                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 687                         gss_release_buffer(&min_stat, &output_token);
 688
 689                         /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 690                         gensec_gssapi_state->sasl_state = STAGE_DONE;
 691
 692                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 693                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically sealed\n"));
 694                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 695                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically signed\n"));
 696                         } else {
 697                                 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographically protection\n"));
 698                         }
 699
 700                         return NT_STATUS_OK;
 701                 }
 702                 case GENSEC_SERVER:
 703                 {
 704                         uint8_t maxlength_proposed[4];
 705                         uint8_t security_supported = 0x0;
 706                         int conf_state;
 707
 708                         /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
 709                         if (in.length != 0) {
 710                                 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
 711                         }
 712
 713                         /* Give the client some idea what we will support */
 714
 715                         RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
 716                         /* first byte is the proposed security */
 717                         maxlength_proposed[0] = '\0';
 718
 719                         gensec_gssapi_state->sasl_protection = 0;
 720                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 721                                 security_supported |= NEG_SEAL;
 722                         }
 723                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 724                                 security_supported |= NEG_SIGN;
 725                         }
 726                         if (security_supported == 0) {
 727                                 /* If we don't support anything, this must be 0 */
 728                                 RSIVAL(maxlength_proposed, 0, 0x0);
 729                         }
 730
 731                         /* TODO:  We may not wish to support this */
 732                         security_supported |= NEG_NONE;
 733                         maxlength_proposed[0] = security_supported;
 734
 735                         input_token.value = maxlength_proposed;
 736                         input_token.length = sizeof(maxlength_proposed);
 737
 738                         maj_stat = gss_wrap(&min_stat,
 739                                             gensec_gssapi_state->gssapi_context,
 740                                             false,
 741                                             GSS_C_QOP_DEFAULT,
 742                                             &input_token,
 743                                             &conf_state,
 744                                             &output_token);
 745                         if (GSS_ERROR(maj_stat)) {
 746                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 747                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 748                                 return NT_STATUS_ACCESS_DENIED;
 749                         }
 750
 751                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 752                         gss_release_buffer(&min_stat, &output_token);
 753
 754                         gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
 755                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 756                 }
 757                 default:
 758                         return NT_STATUS_INVALID_PARAMETER;
 759
 760                 }
 761         }
 762         /* This is s server-only stage */
 763         case STAGE_SASL_SSF_ACCEPT:
 764         {
 765                 uint8_t maxlength_accepted[4];
 766                 uint8_t security_accepted;
 767                 int conf_state;
 768                 gss_qop_t qop_state;
 769                 input_token.length = in.length;
 770                 input_token.value = in.data;
 771
 772                 maj_stat = gss_unwrap(&min_stat,
 773                                       gensec_gssapi_state->gssapi_context,
 774                                       &input_token,
 775                                       &output_token,
 776                                       &conf_state,
 777                                       &qop_state);
 778                 if (GSS_ERROR(maj_stat)) {
 779                         DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 780                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 781                         return NT_STATUS_ACCESS_DENIED;
 782                 }
 783
 784                 if (output_token.length < 4) {
 785                         return NT_STATUS_INVALID_PARAMETER;
 786                 }
 787
 788                 memcpy(maxlength_accepted, output_token.value, 4);
 789                 gss_release_buffer(&min_stat, &output_token);
 790
 791                 /* first byte is the proposed security */
 792                 security_accepted = maxlength_accepted[0];
 793                 maxlength_accepted[0] = '\0';
 794
 795                 /* Rest is the proposed max wrap length */
 796                 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
 797                                                              gensec_gssapi_state->max_wrap_buf_size);
 798
 799                 gensec_gssapi_state->sasl_protection = 0;
 800                 if (security_accepted & NEG_SEAL) {
 801                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 802                                 DEBUG(1, ("Remote client wanted seal, but gensec refused\n"));
 803                                 return NT_STATUS_ACCESS_DENIED;
 804                         }
 805                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 806                 }
 807                 if (security_accepted & NEG_SIGN) {
 808                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 809                                 DEBUG(1, ("Remote client wanted sign, but gensec refused\n"));
 810                                 return NT_STATUS_ACCESS_DENIED;
 811                         }
 812                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 813                 }
 814                 if (security_accepted & NEG_NONE) {
 815                         gensec_gssapi_state->sasl_protection |= NEG_NONE;
 816                 }
 817
 818                 /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 819                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 820                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 821                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically sealed\n"));
 822                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 823                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically signed\n"));
 824                 } else {
 825                         DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
 826                 }
 827
 828                 *out = data_blob(NULL, 0);
 829                 return NT_STATUS_OK;
 830         }
 831         default:
 832                 return NT_STATUS_INVALID_PARAMETER;
 833         }
 834 }
 835
 836 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
 837                                    TALLOC_CTX *mem_ctx,
 838                                    const DATA_BLOB *in,
 839                                    DATA_BLOB *out)
 840 {
 841         struct gensec_gssapi_state *gensec_gssapi_state
 842                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 843         OM_uint32 maj_stat, min_stat;
 844         gss_buffer_desc input_token, output_token;
 845         int conf_state;
 846         input_token.length = in->length;
 847         input_token.value = in->data;
 848
 849         maj_stat = gss_wrap(&min_stat,
 850                             gensec_gssapi_state->gssapi_context,
 851                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 852                             GSS_C_QOP_DEFAULT,
 853                             &input_token,
 854                             &conf_state,
 855                             &output_token);
 856         if (GSS_ERROR(maj_stat)) {
 857                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 858                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 859                 return NT_STATUS_ACCESS_DENIED;
 860         }
 861
 862         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 863         gss_release_buffer(&min_stat, &output_token);
 864
 865         if (gensec_gssapi_state->sasl) {
 866                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 867                 if (max_wrapped_size < out->length) {
 868                         DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
 869                                   (unsigned)in->length,
 870                                   (unsigned)out->length,
 871                                   (unsigned int)max_wrapped_size));
 872                         return NT_STATUS_INVALID_PARAMETER;
 873                 }
 874         }
 875
 876         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 877             && !conf_state) {
 878                 return NT_STATUS_ACCESS_DENIED;
 879         }
 880         return NT_STATUS_OK;
 881 }
 882
 883 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
 884                                      TALLOC_CTX *mem_ctx,
 885                                      const DATA_BLOB *in,
 886                                      DATA_BLOB *out)
 887 {
 888         struct gensec_gssapi_state *gensec_gssapi_state
 889                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 890         OM_uint32 maj_stat, min_stat;
 891         gss_buffer_desc input_token, output_token;
 892         int conf_state;
 893         gss_qop_t qop_state;
 894         input_token.length = in->length;
 895         input_token.value = in->data;
 896
 897         if (gensec_gssapi_state->sasl) {
 898                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 899                 if (max_wrapped_size < in->length) {
 900                         DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
 901                         return NT_STATUS_INVALID_PARAMETER;
 902                 }
 903         }
 904
 905         maj_stat = gss_unwrap(&min_stat,
 906                               gensec_gssapi_state->gssapi_context,
 907                               &input_token,
 908                               &output_token,
 909                               &conf_state,
 910                               &qop_state);
 911         if (GSS_ERROR(maj_stat)) {
 912                 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
 913                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 914                 return NT_STATUS_ACCESS_DENIED;
 915         }
 916
 917         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 918         gss_release_buffer(&min_stat, &output_token);
 919
 920         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 921             && !conf_state) {
 922                 return NT_STATUS_ACCESS_DENIED;
 923         }
 924         return NT_STATUS_OK;
 925 }
 926
 927 /* Find out the maximum input size negotiated on this connection */
 928
 929 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
 930 {
 931         struct gensec_gssapi_state *gensec_gssapi_state
 932                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 933         OM_uint32 maj_stat, min_stat;
 934         OM_uint32 max_input_size;
 935
 936         maj_stat = gss_wrap_size_limit(&min_stat,
 937                                        gensec_gssapi_state->gssapi_context,
 938                                        gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 939                                        GSS_C_QOP_DEFAULT,
 940                                        gensec_gssapi_state->max_wrap_buf_size,
 941                                        &max_input_size);
 942         if (GSS_ERROR(maj_stat)) {
 943                 TALLOC_CTX *mem_ctx = talloc_new(NULL);
 944                 DEBUG(1, ("gensec_gssapi_max_input_size: determinaing signature size with gss_wrap_size_limit failed: %s\n",
 945                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 946                 talloc_free(mem_ctx);
 947                 return 0;
 948         }
 949
 950         return max_input_size;
 951 }
 952
 953 /* Find out the maximum output size negotiated on this connection */
 954 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
 955 {
 956         struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
 957         return gensec_gssapi_state->max_wrap_buf_size;
 958 }
 959
 960 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
 961                                           TALLOC_CTX *mem_ctx,
 962                                           uint8_t *data, size_t length,
 963                                           const uint8_t *whole_pdu, size_t pdu_length,
 964                                           DATA_BLOB *sig)
 965 {
 966         struct gensec_gssapi_state *gensec_gssapi_state
 967                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 968         OM_uint32 maj_stat, min_stat;
 969         gss_buffer_desc input_token, output_token;
 970         int conf_state;
 971         ssize_t sig_length;
 972
 973         input_token.length = length;
 974         input_token.value = data;
 975
 976         maj_stat = gss_wrap(&min_stat,
 977                             gensec_gssapi_state->gssapi_context,
 978                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 979                             GSS_C_QOP_DEFAULT,
 980                             &input_token,
 981                             &conf_state,
 982                             &output_token);
 983         if (GSS_ERROR(maj_stat)) {
 984                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
 985                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 986                 return NT_STATUS_ACCESS_DENIED;
 987         }
 988
 989         if (output_token.length < input_token.length) {
 990                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
 991                           (long)output_token.length, (long)length));
 992                 return NT_STATUS_INTERNAL_ERROR;
 993         }
 994         sig_length = output_token.length - input_token.length;
 995
 996         memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
 997         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
 998
 999         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1000         dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
1001         dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
1002
1003         gss_release_buffer(&min_stat, &output_token);
1004
1005         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1006             && !conf_state) {
1007                 return NT_STATUS_ACCESS_DENIED;
1008         }
1009         return NT_STATUS_OK;
1010 }
1011
1012 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
1013                                             TALLOC_CTX *mem_ctx,
1014                                             uint8_t *data, size_t length,
1015                                             const uint8_t *whole_pdu, size_t pdu_length,
1016                                             const DATA_BLOB *sig)
1017 {
1018         struct gensec_gssapi_state *gensec_gssapi_state
1019                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1020         OM_uint32 maj_stat, min_stat;
1021         gss_buffer_desc input_token, output_token;
1022         int conf_state;
1023         gss_qop_t qop_state;
1024         DATA_BLOB in;
1025
1026         dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
1027
1028         in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
1029
1030         memcpy(in.data, sig->data, sig->length);
1031         memcpy(in.data + sig->length, data, length);
1032
1033         input_token.length = in.length;
1034         input_token.value = in.data;
1035
1036         maj_stat = gss_unwrap(&min_stat,
1037                               gensec_gssapi_state->gssapi_context,
1038                               &input_token,
1039                               &output_token,
1040                               &conf_state,
1041                               &qop_state);
1042         if (GSS_ERROR(maj_stat)) {
1043                 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
1044                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1045                 return NT_STATUS_ACCESS_DENIED;
1046         }
1047
1048         if (output_token.length != length) {
1049                 return NT_STATUS_INTERNAL_ERROR;
1050         }
1051
1052         memcpy(data, output_token.value, length);
1053
1054         gss_release_buffer(&min_stat, &output_token);
1055
1056         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1057             && !conf_state) {
1058                 return NT_STATUS_ACCESS_DENIED;
1059         }
1060         return NT_STATUS_OK;
1061 }
1062
1063 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1064                                           TALLOC_CTX *mem_ctx,
1065                                           const uint8_t *data, size_t length,
1066                                           const uint8_t *whole_pdu, size_t pdu_length,
1067                                           DATA_BLOB *sig)
1068 {
1069         struct gensec_gssapi_state *gensec_gssapi_state
1070                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1071         OM_uint32 maj_stat, min_stat;
1072         gss_buffer_desc input_token, output_token;
1073
1074         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1075                 input_token.length = pdu_length;
1076                 input_token.value = discard_const_p(uint8_t *, whole_pdu);
1077         } else {
1078                 input_token.length = length;
1079                 input_token.value = discard_const_p(uint8_t *, data);
1080         }
1081
1082         maj_stat = gss_get_mic(&min_stat,
1083                             gensec_gssapi_state->gssapi_context,
1084                             GSS_C_QOP_DEFAULT,
1085                             &input_token,
1086                             &output_token);
1087         if (GSS_ERROR(maj_stat)) {
1088                 DEBUG(1, ("GSS GetMic failed: %s\n",
1089                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1090                 return NT_STATUS_ACCESS_DENIED;
1091         }
1092
1093         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, output_token.length);
1094
1095         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1096
1097         gss_release_buffer(&min_stat, &output_token);
1098
1099         return NT_STATUS_OK;
1100 }
1101
1102 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1103                                            TALLOC_CTX *mem_ctx,
1104                                            const uint8_t *data, size_t length,
1105                                            const uint8_t *whole_pdu, size_t pdu_length,
1106                                            const DATA_BLOB *sig)
1107 {
1108         struct gensec_gssapi_state *gensec_gssapi_state
1109                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1110         OM_uint32 maj_stat, min_stat;
1111         gss_buffer_desc input_token;
1112         gss_buffer_desc input_message;
1113         gss_qop_t qop_state;
1114
1115         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1116
1117         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1118                 input_message.length = pdu_length;
1119                 input_message.value = discard_const(whole_pdu);
1120         } else {
1121                 input_message.length = length;
1122                 input_message.value = discard_const(data);
1123         }
1124
1125         input_token.length = sig->length;
1126         input_token.value = sig->data;
1127
1128         maj_stat = gss_verify_mic(&min_stat,
1129                               gensec_gssapi_state->gssapi_context,
1130                               &input_message,
1131                               &input_token,
1132                               &qop_state);
1133         if (GSS_ERROR(maj_stat)) {
1134                 DEBUG(1, ("GSS VerifyMic failed: %s\n",
1135                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1136                 return NT_STATUS_ACCESS_DENIED;
1137         }
1138
1139         return NT_STATUS_OK;
1140 }
1141
1142 /* Try to figure out what features we actually got on the connection */
1143 static bool gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1144                                        uint32_t feature)
1145 {
1146         struct gensec_gssapi_state *gensec_gssapi_state
1147                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1148         if (feature & GENSEC_FEATURE_SIGN) {
1149                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1150                 if (gensec_gssapi_state->sasl
1151                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1152                         return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1153                                 && (gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG));
1154                 }
1155                 return gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG;
1156         }
1157         if (feature & GENSEC_FEATURE_SEAL) {
1158                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1159                 if (gensec_gssapi_state->sasl
1160                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1161                         return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1162                                  && (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG));
1163                 }
1164                 return gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG;
1165         }
1166         if (feature & GENSEC_FEATURE_SESSION_KEY) {
1167                 /* Only for GSSAPI/Krb5 */
1168                 if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
1169                         return true;
1170                 }
1171         }
1172         if (feature & GENSEC_FEATURE_DCE_STYLE) {
1173                 return gensec_gssapi_state->got_flags & GSS_C_DCE_STYLE;
1174         }
1175         if (feature & GENSEC_FEATURE_NEW_SPNEGO) {
1176                 NTSTATUS status;
1177
1178                 if (!(gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG)) {
1179                         return false;
1180                 }
1181
1182                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "force_new_spnego", false)) {
1183                         return true;
1184                 }
1185                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "disable_new_spnego", false)) {
1186                         return false;
1187                 }
1188
1189                 status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1190                 if (!NT_STATUS_IS_OK(status)) {
1191                         return false;
1192                 }
1193
1194                 if (gensec_gssapi_state->lucid->protocol == 1) {
1195                         return true;
1196                 }
1197
1198                 return false;
1199         }
1200         /* We can always do async (rather than strict request/reply) packets.  */
1201         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1202                 return true;
1203         }
1204         return false;
1205 }
1206
1207 /*
1208  * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1209  * (for encrypting some passwords).
1210  *
1211  * This breaks all the abstractions, but what do you expect...
1212  */
1213 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1214                                           DATA_BLOB *session_key)
1215 {
1216         struct gensec_gssapi_state *gensec_gssapi_state
1217                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1218         OM_uint32 maj_stat, min_stat;
1219         krb5_keyblock *subkey;
1220
1221         if (gensec_gssapi_state->sasl_state != STAGE_DONE) {
1222                 return NT_STATUS_NO_USER_SESSION_KEY;
1223         }
1224
1225         if (gensec_gssapi_state->session_key.data) {
1226                 *session_key = gensec_gssapi_state->session_key;
1227                 return NT_STATUS_OK;
1228         }
1229
1230         maj_stat = gsskrb5_get_subkey(&min_stat,
1231                                       gensec_gssapi_state->gssapi_context,
1232                                       &subkey);
1233         if (maj_stat != 0) {
1234                 DEBUG(1, ("NO session key for this mech\n"));
1235                 return NT_STATUS_NO_USER_SESSION_KEY;
1236         }
1237
1238         DEBUG(10, ("Got KRB5 session key of length %d%s\n",
1239                    (int)KRB5_KEY_LENGTH(subkey),
1240                    (gensec_gssapi_state->sasl_state == STAGE_DONE)?" (done)":""));
1241         *session_key = data_blob_talloc(gensec_gssapi_state,
1242                                         KRB5_KEY_DATA(subkey), KRB5_KEY_LENGTH(subkey));
1243         krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context, subkey);
1244         gensec_gssapi_state->session_key = *session_key;
1245         dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
1246
1247         return NT_STATUS_OK;
1248 }
1249
1250 /* Get some basic (and authorization) information about the user on
1251  * this session.  This uses either the PAC (if present) or a local
1252  * database lookup */
1253 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1254                                            struct auth_session_info **_session_info)
1255 {
1256         NTSTATUS nt_status;
1257         TALLOC_CTX *mem_ctx;
1258         struct gensec_gssapi_state *gensec_gssapi_state
1259                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1260         struct auth_user_info_dc *user_info_dc = NULL;
1261         struct auth_session_info *session_info = NULL;
1262         OM_uint32 maj_stat, min_stat;
1263         gss_buffer_desc pac;
1264         DATA_BLOB pac_blob;
1265         struct PAC_SIGNATURE_DATA *pac_srv_sig = NULL;
1266         struct PAC_SIGNATURE_DATA *pac_kdc_sig = NULL;
1267
1268         if ((gensec_gssapi_state->gss_oid->length != gss_mech_krb5->length)
1269             || (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
1270                        gensec_gssapi_state->gss_oid->length) != 0)) {
1271                 DEBUG(1, ("NO session info available for this mech\n"));
1272                 return NT_STATUS_INVALID_PARAMETER;
1273         }
1274
1275         mem_ctx = talloc_named(gensec_gssapi_state, 0, "gensec_gssapi_session_info context");
1276         NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
1277
1278         maj_stat = gsskrb5_extract_authz_data_from_sec_context(&min_stat,
1279                                                                gensec_gssapi_state->gssapi_context,
1280                                                                KRB5_AUTHDATA_WIN2K_PAC,
1281                                                                &pac);
1282
1283
1284         if (maj_stat == 0) {
1285                 pac_blob = data_blob_talloc(mem_ctx, pac.value, pac.length);
1286                 gss_release_buffer(&min_stat, &pac);
1287
1288         } else {
1289                 pac_blob = data_blob(NULL, 0);
1290         }
1291
1292         /* IF we have the PAC - otherwise we need to get this
1293          * data from elsewere - local ldb, or (TODO) lookup of some
1294          * kind...
1295          */
1296         if (pac_blob.length) {
1297                 pac_srv_sig = talloc(mem_ctx, struct PAC_SIGNATURE_DATA);
1298                 if (!pac_srv_sig) {
1299                         talloc_free(mem_ctx);
1300                         return NT_STATUS_NO_MEMORY;
1301                 }
1302                 pac_kdc_sig = talloc(mem_ctx, struct PAC_SIGNATURE_DATA);
1303                 if (!pac_kdc_sig) {
1304                         talloc_free(mem_ctx);
1305                         return NT_STATUS_NO_MEMORY;
1306                 }
1307
1308                 nt_status = kerberos_pac_blob_to_user_info_dc(mem_ctx,
1309                                                               pac_blob,
1310                                                               gensec_gssapi_state->smb_krb5_context->krb5_context,
1311                                                               &user_info_dc,
1312                                                               pac_srv_sig,
1313                                                               pac_kdc_sig);
1314                 if (!NT_STATUS_IS_OK(nt_status)) {
1315                         talloc_free(mem_ctx);
1316                         return nt_status;
1317                 }
1318         } else {
1319                 gss_buffer_desc name_token;
1320                 char *principal_string;
1321
1322                 maj_stat = gss_display_name (&min_stat,
1323                                              gensec_gssapi_state->client_name,
1324                                              &name_token,
1325                                              NULL);
1326                 if (GSS_ERROR(maj_stat)) {
1327                         DEBUG(1, ("GSS display_name failed: %s\n",
1328                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1329                         talloc_free(mem_ctx);
1330                         return NT_STATUS_FOOBAR;
1331                 }
1332
1333                 principal_string = talloc_strndup(mem_ctx,
1334                                                   (const char *)name_token.value,
1335                                                   name_token.length);
1336
1337                 gss_release_buffer(&min_stat, &name_token);
1338
1339                 if (!principal_string) {
1340                         talloc_free(mem_ctx);
1341                         return NT_STATUS_NO_MEMORY;
1342                 }
1343
1344                 if (gensec_security->auth_context &&
1345                     !gensec_setting_bool(gensec_security->settings, "gensec", "require_pac", false)) {
1346                         DEBUG(1, ("Unable to find PAC, resorting to local user lookup: %s\n",
1347                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1348                         nt_status = gensec_security->auth_context->get_user_info_dc_principal(mem_ctx,
1349                                                                                              gensec_security->auth_context,
1350                                                                                              principal_string,
1351                                                                                              NULL,
1352                                                                                              &user_info_dc);
1353
1354                         if (!NT_STATUS_IS_OK(nt_status)) {
1355                                 talloc_free(mem_ctx);
1356                                 return nt_status;
1357                         }
1358                 } else {
1359                         DEBUG(1, ("Unable to find PAC in ticket from %s, failing to allow access: %s\n",
1360                                   principal_string,
1361                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1362                         return NT_STATUS_ACCESS_DENIED;
1363                 }
1364         }
1365
1366         /* references the user_info_dc into the session_info */
1367         nt_status = gensec_generate_session_info(mem_ctx, gensec_security,
1368                                                  user_info_dc, &session_info);
1369         if (!NT_STATUS_IS_OK(nt_status)) {
1370                 talloc_free(mem_ctx);
1371                 return nt_status;
1372         }
1373
1374         nt_status = gensec_gssapi_session_key(gensec_security, &session_info->session_key);
1375         if (!NT_STATUS_IS_OK(nt_status)) {
1376                 talloc_free(mem_ctx);
1377                 return nt_status;
1378         }
1379
1380         /* Allow torture tests to check the PAC signatures */
1381         if (session_info->torture) {
1382                 session_info->torture->pac_srv_sig = talloc_steal(session_info->torture, pac_srv_sig);
1383                 session_info->torture->pac_kdc_sig = talloc_steal(session_info->torture, pac_kdc_sig);
1384         }
1385
1386         if (!(gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG)) {
1387                 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1388         } else {
1389                 krb5_error_code ret;
1390                 const char *error_string;
1391
1392                 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1393                 session_info->credentials = cli_credentials_init(session_info);
1394                 if (!session_info->credentials) {
1395                         talloc_free(mem_ctx);
1396                         return NT_STATUS_NO_MEMORY;
1397                 }
1398
1399                 cli_credentials_set_conf(session_info->credentials, gensec_security->settings->lp_ctx);
1400                 /* Just so we don't segfault trying to get at a username */
1401                 cli_credentials_set_anonymous(session_info->credentials);
1402
1403                 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1404                                                            gensec_security->settings->lp_ctx,
1405                                                            gensec_gssapi_state->delegated_cred_handle,
1406                                                            CRED_SPECIFIED, &error_string);
1407                 if (ret) {
1408                         talloc_free(mem_ctx);
1409                         DEBUG(2,("Failed to get gss creds: %s\n", error_string));
1410                         return NT_STATUS_NO_MEMORY;
1411                 }
1412
1413                 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1414                 cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
1415
1416                 /* It has been taken from this place... */
1417                 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1418         }
1419         talloc_steal(gensec_gssapi_state, session_info);
1420         talloc_free(mem_ctx);
1421         *_session_info = session_info;
1422
1423         return NT_STATUS_OK;
1424 }
1425
1426 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
1427 {
1428         struct gensec_gssapi_state *gensec_gssapi_state
1429                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1430         NTSTATUS status;
1431
1432         if (gensec_gssapi_state->sig_size) {
1433                 return gensec_gssapi_state->sig_size;
1434         }
1435
1436         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1437                 gensec_gssapi_state->sig_size = 45;
1438         } else {
1439                 gensec_gssapi_state->sig_size = 37;
1440         }
1441
1442         status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1443         if (!NT_STATUS_IS_OK(status)) {
1444                 return gensec_gssapi_state->sig_size;
1445         }
1446
1447         if (gensec_gssapi_state->lucid->protocol == 1) {
1448                 if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1449                         /*
1450                          * TODO: windows uses 76 here, but we don't know
1451                          *       gss_wrap works with aes keys yet
1452                          */
1453                         gensec_gssapi_state->sig_size = 76;
1454                 } else {
1455                         gensec_gssapi_state->sig_size = 28;
1456                 }
1457         } else if (gensec_gssapi_state->lucid->protocol == 0) {
1458                 switch (gensec_gssapi_state->lucid->rfc1964_kd.ctx_key.type) {
1459                 case KEYTYPE_DES:
1460                 case KEYTYPE_ARCFOUR:
1461                 case KEYTYPE_ARCFOUR_56:
1462                         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1463                                 gensec_gssapi_state->sig_size = 45;
1464                         } else {
1465                                 gensec_gssapi_state->sig_size = 37;
1466                         }
1467                         break;
1468                 case KEYTYPE_DES3:
1469                         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1470                                 gensec_gssapi_state->sig_size = 57;
1471                         } else {
1472                                 gensec_gssapi_state->sig_size = 49;
1473                         }
1474                         break;
1475                 }
1476         }
1477
1478         return gensec_gssapi_state->sig_size;
1479 }
1480
1481 static const char *gensec_gssapi_krb5_oids[] = {
1482         GENSEC_OID_KERBEROS5_OLD,
1483         GENSEC_OID_KERBEROS5,
1484         NULL
1485 };
1486
1487 static const char *gensec_gssapi_spnego_oids[] = {
1488         GENSEC_OID_SPNEGO,
1489         NULL
1490 };
1491
1492 /* As a server, this could in theory accept any GSSAPI mech */
1493 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1494         .name           = "gssapi_spnego",
1495         .sasl_name      = "GSS-SPNEGO",
1496         .auth_type      = DCERPC_AUTH_TYPE_SPNEGO,
1497         .oid            = gensec_gssapi_spnego_oids,
1498         .client_start   = gensec_gssapi_client_start,
1499         .server_start   = gensec_gssapi_server_start,
1500         .magic          = gensec_gssapi_magic,
1501         .update         = gensec_gssapi_update,
1502         .session_key    = gensec_gssapi_session_key,
1503         .session_info   = gensec_gssapi_session_info,
1504         .sign_packet    = gensec_gssapi_sign_packet,
1505         .check_packet   = gensec_gssapi_check_packet,
1506         .seal_packet    = gensec_gssapi_seal_packet,
1507         .unseal_packet  = gensec_gssapi_unseal_packet,
1508         .wrap           = gensec_gssapi_wrap,
1509         .unwrap         = gensec_gssapi_unwrap,
1510         .have_feature   = gensec_gssapi_have_feature,
1511         .enabled        = false,
1512         .kerberos       = true,
1513         .priority       = GENSEC_GSSAPI
1514 };
1515
1516 /* As a server, this could in theory accept any GSSAPI mech */
1517 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1518         .name           = "gssapi_krb5",
1519         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
1520         .oid            = gensec_gssapi_krb5_oids,
1521         .client_start   = gensec_gssapi_client_start,
1522         .server_start   = gensec_gssapi_server_start,
1523         .magic          = gensec_gssapi_magic,
1524         .update         = gensec_gssapi_update,
1525         .session_key    = gensec_gssapi_session_key,
1526         .session_info   = gensec_gssapi_session_info,
1527         .sig_size       = gensec_gssapi_sig_size,
1528         .sign_packet    = gensec_gssapi_sign_packet,
1529         .check_packet   = gensec_gssapi_check_packet,
1530         .seal_packet    = gensec_gssapi_seal_packet,
1531         .unseal_packet  = gensec_gssapi_unseal_packet,
1532         .wrap           = gensec_gssapi_wrap,
1533         .unwrap         = gensec_gssapi_unwrap,
1534         .have_feature   = gensec_gssapi_have_feature,
1535         .enabled        = true,
1536         .kerberos       = true,
1537         .priority       = GENSEC_GSSAPI
1538 };
1539
1540 /* As a server, this could in theory accept any GSSAPI mech */
1541 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1542         .name             = "gssapi_krb5_sasl",
1543         .sasl_name        = "GSSAPI",
1544         .client_start     = gensec_gssapi_sasl_client_start,
1545         .server_start     = gensec_gssapi_sasl_server_start,
1546         .update           = gensec_gssapi_update,
1547         .session_key      = gensec_gssapi_session_key,
1548         .session_info     = gensec_gssapi_session_info,
1549         .max_input_size   = gensec_gssapi_max_input_size,
1550         .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1551         .wrap             = gensec_gssapi_wrap,
1552         .unwrap           = gensec_gssapi_unwrap,
1553         .have_feature     = gensec_gssapi_have_feature,
1554         .enabled          = true,
1555         .kerberos         = true,
1556         .priority         = GENSEC_GSSAPI
1557 };
1558
1559 _PUBLIC_ NTSTATUS gensec_gssapi_init(void)
1560 {
1561         NTSTATUS ret;
1562
1563         ret = gensec_register(&gensec_gssapi_spnego_security_ops);
1564         if (!NT_STATUS_IS_OK(ret)) {
1565                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1566                         gensec_gssapi_spnego_security_ops.name));
1567                 return ret;
1568         }
1569
1570         ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1571         if (!NT_STATUS_IS_OK(ret)) {
1572                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1573                         gensec_gssapi_krb5_security_ops.name));
1574                 return ret;
1575         }
1576
1577         ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1578         if (!NT_STATUS_IS_OK(ret)) {
1579                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1580                         gensec_gssapi_sasl_krb5_security_ops.name));
1581                 return ret;
1582         }
1583
1584         return ret;
1585 }