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                                 /* Due to a very subtle interaction
 539                                  * with SASL and the LDAP libs, we
 540                                  * must ensure the data pointer is
 541                                  * != NULL, but the length is 0.
 542                                  *
 543                                  * This ensures we send a 'zero
 544                                  * length' (rather than NULL) response
 545                                  */
 546
 547                                 if (!out->data) {
 548                                         out->data = (uint8_t *)talloc_strdup(out_mem_ctx, "\0");
 549                                 }
 550
 551                                 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
 552                                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 553                         } else {
 554                                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 555
 556                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 557                                         DEBUG(5, ("GSSAPI Connection will be cryptographically sealed\n"));
 558                                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 559                                         DEBUG(5, ("GSSAPI Connection will be cryptographically signed\n"));
 560                                 } else {
 561                                         DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
 562                                 }
 563
 564                                 return NT_STATUS_OK;
 565                         }
 566                 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
 567                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 568                         gss_release_buffer(&min_stat2, &output_token);
 569
 570                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 571                 } else if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
 572                         switch (min_stat) {
 573                         case KRB5KRB_AP_ERR_TKT_NYV:
 574                                 DEBUG(1, ("Error with ticket to contact %s: possible clock skew between us and the KDC or target server: %s\n",
 575                                           gensec_gssapi_state->target_principal,
 576                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 577                                 return NT_STATUS_TIME_DIFFERENCE_AT_DC; /* Make SPNEGO ignore us, we can't go any further here */
 578                         case KRB5KRB_AP_ERR_TKT_EXPIRED:
 579                                 DEBUG(1, ("Error with ticket to contact %s: ticket is expired, possible clock skew between us and the KDC or target server: %s\n",
 580                                           gensec_gssapi_state->target_principal,
 581                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 582                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 583                         case KRB5_KDC_UNREACH:
 584                                 DEBUG(3, ("Cannot reach a KDC we require in order to obtain a ticetk to %s: %s\n",
 585                                           gensec_gssapi_state->target_principal,
 586                                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 587                                 return NT_STATUS_NO_LOGON_SERVERS; /* Make SPNEGO ignore us, we can't go any further here */
 588                         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 589                                 DEBUG(3, ("Server %s is not registered with our KDC: %s\n",
 590                                           gensec_gssapi_state->target_principal,
 591                                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 592                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 593                         case KRB5KRB_AP_ERR_MSG_TYPE:
 594                                 /* garbage input, possibly from the auto-mech detection */
 595                                 return NT_STATUS_INVALID_PARAMETER;
 596                         default:
 597                                 DEBUG(1, ("GSS %s Update(krb5)(%d) Update failed: %s\n",
 598                                           gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 599                                           gensec_gssapi_state->gss_exchange_count,
 600                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 601                                 return nt_status;
 602                         }
 603                 } else {
 604                         DEBUG(1, ("GSS %s Update(%d) failed: %s\n",
 605                                   gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 606                                   gensec_gssapi_state->gss_exchange_count,
 607                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 608                         return nt_status;
 609                 }
 610                 break;
 611         }
 612
 613         /* These last two stages are only done if we were invoked as SASL */
 614         case STAGE_SASL_SSF_NEG:
 615         {
 616                 switch (gensec_security->gensec_role) {
 617                 case GENSEC_CLIENT:
 618                 {
 619                         uint8_t maxlength_proposed[4];
 620                         uint8_t maxlength_accepted[4];
 621                         uint8_t security_supported;
 622                         int conf_state;
 623                         gss_qop_t qop_state;
 624                         input_token.length = in.length;
 625                         input_token.value = in.data;
 626
 627                         /* As a client, we have just send a
 628                          * zero-length blob to the server (after the
 629                          * normal GSSAPI exchange), and it has replied
 630                          * with it's SASL negotiation */
 631
 632                         maj_stat = gss_unwrap(&min_stat,
 633                                               gensec_gssapi_state->gssapi_context,
 634                                               &input_token,
 635                                               &output_token,
 636                                               &conf_state,
 637                                               &qop_state);
 638                         if (GSS_ERROR(maj_stat)) {
 639                                 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 640                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 641                                 return NT_STATUS_ACCESS_DENIED;
 642                         }
 643
 644                         if (output_token.length < 4) {
 645                                 return NT_STATUS_INVALID_PARAMETER;
 646                         }
 647
 648                         memcpy(maxlength_proposed, output_token.value, 4);
 649                         gss_release_buffer(&min_stat, &output_token);
 650
 651                         /* first byte is the proposed security */
 652                         security_supported = maxlength_proposed[0];
 653                         maxlength_proposed[0] = '\0';
 654
 655                         /* Rest is the proposed max wrap length */
 656                         gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
 657                                                                      gensec_gssapi_state->max_wrap_buf_size);
 658                         gensec_gssapi_state->sasl_protection = 0;
 659                         if (security_supported & NEG_SEAL) {
 660                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 661                                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 662                                 }
 663                         }
 664                         if (security_supported & NEG_SIGN) {
 665                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 666                                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 667                                 }
 668                         }
 669                         if (security_supported & NEG_NONE) {
 670                                 gensec_gssapi_state->sasl_protection |= NEG_NONE;
 671                         }
 672                         if (gensec_gssapi_state->sasl_protection == 0) {
 673                                 DEBUG(1, ("Remote server does not support unprotected connections\n"));
 674                                 return NT_STATUS_ACCESS_DENIED;
 675                         }
 676
 677                         /* Send back the negotiated max length */
 678
 679                         RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
 680
 681                         maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
 682
 683                         input_token.value = maxlength_accepted;
 684                         input_token.length = sizeof(maxlength_accepted);
 685
 686                         maj_stat = gss_wrap(&min_stat,
 687                                             gensec_gssapi_state->gssapi_context,
 688                                             false,
 689                                             GSS_C_QOP_DEFAULT,
 690                                             &input_token,
 691                                             &conf_state,
 692                                             &output_token);
 693                         if (GSS_ERROR(maj_stat)) {
 694                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 695                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 696                                 return NT_STATUS_ACCESS_DENIED;
 697                         }
 698
 699                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 700                         gss_release_buffer(&min_stat, &output_token);
 701
 702                         /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 703                         gensec_gssapi_state->sasl_state = STAGE_DONE;
 704
 705                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 706                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically sealed\n"));
 707                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 708                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically signed\n"));
 709                         } else {
 710                                 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographically protection\n"));
 711                         }
 712
 713                         return NT_STATUS_OK;
 714                 }
 715                 case GENSEC_SERVER:
 716                 {
 717                         uint8_t maxlength_proposed[4];
 718                         uint8_t security_supported = 0x0;
 719                         int conf_state;
 720
 721                         /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
 722                         if (in.length != 0) {
 723                                 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
 724                         }
 725
 726                         /* Give the client some idea what we will support */
 727
 728                         RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
 729                         /* first byte is the proposed security */
 730                         maxlength_proposed[0] = '\0';
 731
 732                         gensec_gssapi_state->sasl_protection = 0;
 733                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 734                                 security_supported |= NEG_SEAL;
 735                         }
 736                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 737                                 security_supported |= NEG_SIGN;
 738                         }
 739                         if (security_supported == 0) {
 740                                 /* If we don't support anything, this must be 0 */
 741                                 RSIVAL(maxlength_proposed, 0, 0x0);
 742                         }
 743
 744                         /* TODO:  We may not wish to support this */
 745                         security_supported |= NEG_NONE;
 746                         maxlength_proposed[0] = security_supported;
 747
 748                         input_token.value = maxlength_proposed;
 749                         input_token.length = sizeof(maxlength_proposed);
 750
 751                         maj_stat = gss_wrap(&min_stat,
 752                                             gensec_gssapi_state->gssapi_context,
 753                                             false,
 754                                             GSS_C_QOP_DEFAULT,
 755                                             &input_token,
 756                                             &conf_state,
 757                                             &output_token);
 758                         if (GSS_ERROR(maj_stat)) {
 759                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 760                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 761                                 return NT_STATUS_ACCESS_DENIED;
 762                         }
 763
 764                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 765                         gss_release_buffer(&min_stat, &output_token);
 766
 767                         gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
 768                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 769                 }
 770                 default:
 771                         return NT_STATUS_INVALID_PARAMETER;
 772
 773                 }
 774         }
 775         /* This is s server-only stage */
 776         case STAGE_SASL_SSF_ACCEPT:
 777         {
 778                 uint8_t maxlength_accepted[4];
 779                 uint8_t security_accepted;
 780                 int conf_state;
 781                 gss_qop_t qop_state;
 782                 input_token.length = in.length;
 783                 input_token.value = in.data;
 784
 785                 maj_stat = gss_unwrap(&min_stat,
 786                                       gensec_gssapi_state->gssapi_context,
 787                                       &input_token,
 788                                       &output_token,
 789                                       &conf_state,
 790                                       &qop_state);
 791                 if (GSS_ERROR(maj_stat)) {
 792                         DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 793                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 794                         return NT_STATUS_ACCESS_DENIED;
 795                 }
 796
 797                 if (output_token.length < 4) {
 798                         return NT_STATUS_INVALID_PARAMETER;
 799                 }
 800
 801                 memcpy(maxlength_accepted, output_token.value, 4);
 802                 gss_release_buffer(&min_stat, &output_token);
 803
 804                 /* first byte is the proposed security */
 805                 security_accepted = maxlength_accepted[0];
 806                 maxlength_accepted[0] = '\0';
 807
 808                 /* Rest is the proposed max wrap length */
 809                 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
 810                                                              gensec_gssapi_state->max_wrap_buf_size);
 811
 812                 gensec_gssapi_state->sasl_protection = 0;
 813                 if (security_accepted & NEG_SEAL) {
 814                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 815                                 DEBUG(1, ("Remote client wanted seal, but gensec refused\n"));
 816                                 return NT_STATUS_ACCESS_DENIED;
 817                         }
 818                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 819                 }
 820                 if (security_accepted & NEG_SIGN) {
 821                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 822                                 DEBUG(1, ("Remote client wanted sign, but gensec refused\n"));
 823                                 return NT_STATUS_ACCESS_DENIED;
 824                         }
 825                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 826                 }
 827                 if (security_accepted & NEG_NONE) {
 828                         gensec_gssapi_state->sasl_protection |= NEG_NONE;
 829                 }
 830
 831                 /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 832                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 833                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 834                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically sealed\n"));
 835                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 836                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically signed\n"));
 837                 } else {
 838                         DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
 839                 }
 840
 841                 *out = data_blob(NULL, 0);
 842                 return NT_STATUS_OK;
 843         }
 844         default:
 845                 return NT_STATUS_INVALID_PARAMETER;
 846         }
 847 }
 848
 849 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
 850                                    TALLOC_CTX *mem_ctx,
 851                                    const DATA_BLOB *in,
 852                                    DATA_BLOB *out)
 853 {
 854         struct gensec_gssapi_state *gensec_gssapi_state
 855                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 856         OM_uint32 maj_stat, min_stat;
 857         gss_buffer_desc input_token, output_token;
 858         int conf_state;
 859         input_token.length = in->length;
 860         input_token.value = in->data;
 861
 862         maj_stat = gss_wrap(&min_stat,
 863                             gensec_gssapi_state->gssapi_context,
 864                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 865                             GSS_C_QOP_DEFAULT,
 866                             &input_token,
 867                             &conf_state,
 868                             &output_token);
 869         if (GSS_ERROR(maj_stat)) {
 870                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 871                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 872                 return NT_STATUS_ACCESS_DENIED;
 873         }
 874
 875         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 876         gss_release_buffer(&min_stat, &output_token);
 877
 878         if (gensec_gssapi_state->sasl) {
 879                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 880                 if (max_wrapped_size < out->length) {
 881                         DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
 882                                   (unsigned)in->length,
 883                                   (unsigned)out->length,
 884                                   (unsigned int)max_wrapped_size));
 885                         return NT_STATUS_INVALID_PARAMETER;
 886                 }
 887         }
 888
 889         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 890             && !conf_state) {
 891                 return NT_STATUS_ACCESS_DENIED;
 892         }
 893         return NT_STATUS_OK;
 894 }
 895
 896 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
 897                                      TALLOC_CTX *mem_ctx,
 898                                      const DATA_BLOB *in,
 899                                      DATA_BLOB *out)
 900 {
 901         struct gensec_gssapi_state *gensec_gssapi_state
 902                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 903         OM_uint32 maj_stat, min_stat;
 904         gss_buffer_desc input_token, output_token;
 905         int conf_state;
 906         gss_qop_t qop_state;
 907         input_token.length = in->length;
 908         input_token.value = in->data;
 909
 910         if (gensec_gssapi_state->sasl) {
 911                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 912                 if (max_wrapped_size < in->length) {
 913                         DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
 914                         return NT_STATUS_INVALID_PARAMETER;
 915                 }
 916         }
 917
 918         maj_stat = gss_unwrap(&min_stat,
 919                               gensec_gssapi_state->gssapi_context,
 920                               &input_token,
 921                               &output_token,
 922                               &conf_state,
 923                               &qop_state);
 924         if (GSS_ERROR(maj_stat)) {
 925                 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
 926                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 927                 return NT_STATUS_ACCESS_DENIED;
 928         }
 929
 930         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 931         gss_release_buffer(&min_stat, &output_token);
 932
 933         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 934             && !conf_state) {
 935                 return NT_STATUS_ACCESS_DENIED;
 936         }
 937         return NT_STATUS_OK;
 938 }
 939
 940 /* Find out the maximum input size negotiated on this connection */
 941
 942 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
 943 {
 944         struct gensec_gssapi_state *gensec_gssapi_state
 945                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 946         OM_uint32 maj_stat, min_stat;
 947         OM_uint32 max_input_size;
 948
 949         maj_stat = gss_wrap_size_limit(&min_stat,
 950                                        gensec_gssapi_state->gssapi_context,
 951                                        gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 952                                        GSS_C_QOP_DEFAULT,
 953                                        gensec_gssapi_state->max_wrap_buf_size,
 954                                        &max_input_size);
 955         if (GSS_ERROR(maj_stat)) {
 956                 TALLOC_CTX *mem_ctx = talloc_new(NULL);
 957                 DEBUG(1, ("gensec_gssapi_max_input_size: determinaing signature size with gss_wrap_size_limit failed: %s\n",
 958                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 959                 talloc_free(mem_ctx);
 960                 return 0;
 961         }
 962
 963         return max_input_size;
 964 }
 965
 966 /* Find out the maximum output size negotiated on this connection */
 967 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
 968 {
 969         struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
 970         return gensec_gssapi_state->max_wrap_buf_size;
 971 }
 972
 973 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
 974                                           TALLOC_CTX *mem_ctx,
 975                                           uint8_t *data, size_t length,
 976                                           const uint8_t *whole_pdu, size_t pdu_length,
 977                                           DATA_BLOB *sig)
 978 {
 979         struct gensec_gssapi_state *gensec_gssapi_state
 980                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 981         OM_uint32 maj_stat, min_stat;
 982         gss_buffer_desc input_token, output_token;
 983         int conf_state;
 984         ssize_t sig_length;
 985
 986         input_token.length = length;
 987         input_token.value = data;
 988
 989         maj_stat = gss_wrap(&min_stat,
 990                             gensec_gssapi_state->gssapi_context,
 991                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 992                             GSS_C_QOP_DEFAULT,
 993                             &input_token,
 994                             &conf_state,
 995                             &output_token);
 996         if (GSS_ERROR(maj_stat)) {
 997                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
 998                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 999                 return NT_STATUS_ACCESS_DENIED;
1000         }
1001
1002         if (output_token.length < input_token.length) {
1003                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
1004                           (long)output_token.length, (long)length));
1005                 return NT_STATUS_INTERNAL_ERROR;
1006         }
1007         sig_length = output_token.length - input_token.length;
1008
1009         memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
1010         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
1011
1012         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1013         dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
1014         dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
1015
1016         gss_release_buffer(&min_stat, &output_token);
1017
1018         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1019             && !conf_state) {
1020                 return NT_STATUS_ACCESS_DENIED;
1021         }
1022         return NT_STATUS_OK;
1023 }
1024
1025 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
1026                                             TALLOC_CTX *mem_ctx,
1027                                             uint8_t *data, size_t length,
1028                                             const uint8_t *whole_pdu, size_t pdu_length,
1029                                             const DATA_BLOB *sig)
1030 {
1031         struct gensec_gssapi_state *gensec_gssapi_state
1032                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1033         OM_uint32 maj_stat, min_stat;
1034         gss_buffer_desc input_token, output_token;
1035         int conf_state;
1036         gss_qop_t qop_state;
1037         DATA_BLOB in;
1038
1039         dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
1040
1041         in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
1042
1043         memcpy(in.data, sig->data, sig->length);
1044         memcpy(in.data + sig->length, data, length);
1045
1046         input_token.length = in.length;
1047         input_token.value = in.data;
1048
1049         maj_stat = gss_unwrap(&min_stat,
1050                               gensec_gssapi_state->gssapi_context,
1051                               &input_token,
1052                               &output_token,
1053                               &conf_state,
1054                               &qop_state);
1055         if (GSS_ERROR(maj_stat)) {
1056                 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
1057                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1058                 return NT_STATUS_ACCESS_DENIED;
1059         }
1060
1061         if (output_token.length != length) {
1062                 return NT_STATUS_INTERNAL_ERROR;
1063         }
1064
1065         memcpy(data, output_token.value, length);
1066
1067         gss_release_buffer(&min_stat, &output_token);
1068
1069         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1070             && !conf_state) {
1071                 return NT_STATUS_ACCESS_DENIED;
1072         }
1073         return NT_STATUS_OK;
1074 }
1075
1076 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1077                                           TALLOC_CTX *mem_ctx,
1078                                           const uint8_t *data, size_t length,
1079                                           const uint8_t *whole_pdu, size_t pdu_length,
1080                                           DATA_BLOB *sig)
1081 {
1082         struct gensec_gssapi_state *gensec_gssapi_state
1083                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1084         OM_uint32 maj_stat, min_stat;
1085         gss_buffer_desc input_token, output_token;
1086
1087         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1088                 input_token.length = pdu_length;
1089                 input_token.value = discard_const_p(uint8_t *, whole_pdu);
1090         } else {
1091                 input_token.length = length;
1092                 input_token.value = discard_const_p(uint8_t *, data);
1093         }
1094
1095         maj_stat = gss_get_mic(&min_stat,
1096                             gensec_gssapi_state->gssapi_context,
1097                             GSS_C_QOP_DEFAULT,
1098                             &input_token,
1099                             &output_token);
1100         if (GSS_ERROR(maj_stat)) {
1101                 DEBUG(1, ("GSS GetMic failed: %s\n",
1102                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1103                 return NT_STATUS_ACCESS_DENIED;
1104         }
1105
1106         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, output_token.length);
1107
1108         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1109
1110         gss_release_buffer(&min_stat, &output_token);
1111
1112         return NT_STATUS_OK;
1113 }
1114
1115 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1116                                            TALLOC_CTX *mem_ctx,
1117                                            const uint8_t *data, size_t length,
1118                                            const uint8_t *whole_pdu, size_t pdu_length,
1119                                            const DATA_BLOB *sig)
1120 {
1121         struct gensec_gssapi_state *gensec_gssapi_state
1122                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1123         OM_uint32 maj_stat, min_stat;
1124         gss_buffer_desc input_token;
1125         gss_buffer_desc input_message;
1126         gss_qop_t qop_state;
1127
1128         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1129
1130         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1131                 input_message.length = pdu_length;
1132                 input_message.value = discard_const(whole_pdu);
1133         } else {
1134                 input_message.length = length;
1135                 input_message.value = discard_const(data);
1136         }
1137
1138         input_token.length = sig->length;
1139         input_token.value = sig->data;
1140
1141         maj_stat = gss_verify_mic(&min_stat,
1142                               gensec_gssapi_state->gssapi_context,
1143                               &input_message,
1144                               &input_token,
1145                               &qop_state);
1146         if (GSS_ERROR(maj_stat)) {
1147                 DEBUG(1, ("GSS VerifyMic failed: %s\n",
1148                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1149                 return NT_STATUS_ACCESS_DENIED;
1150         }
1151
1152         return NT_STATUS_OK;
1153 }
1154
1155 /* Try to figure out what features we actually got on the connection */
1156 static bool gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1157                                        uint32_t feature)
1158 {
1159         struct gensec_gssapi_state *gensec_gssapi_state
1160                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1161         if (feature & GENSEC_FEATURE_SIGN) {
1162                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1163                 if (gensec_gssapi_state->sasl
1164                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1165                         return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1166                                 && (gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG));
1167                 }
1168                 return gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG;
1169         }
1170         if (feature & GENSEC_FEATURE_SEAL) {
1171                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1172                 if (gensec_gssapi_state->sasl
1173                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1174                         return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1175                                  && (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG));
1176                 }
1177                 return gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG;
1178         }
1179         if (feature & GENSEC_FEATURE_SESSION_KEY) {
1180                 /* Only for GSSAPI/Krb5 */
1181                 if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
1182                         return true;
1183                 }
1184         }
1185         if (feature & GENSEC_FEATURE_DCE_STYLE) {
1186                 return gensec_gssapi_state->got_flags & GSS_C_DCE_STYLE;
1187         }
1188         if (feature & GENSEC_FEATURE_NEW_SPNEGO) {
1189                 NTSTATUS status;
1190
1191                 if (!(gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG)) {
1192                         return false;
1193                 }
1194
1195                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "force_new_spnego", false)) {
1196                         return true;
1197                 }
1198                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "disable_new_spnego", false)) {
1199                         return false;
1200                 }
1201
1202                 status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1203                 if (!NT_STATUS_IS_OK(status)) {
1204                         return false;
1205                 }
1206
1207                 if (gensec_gssapi_state->lucid->protocol == 1) {
1208                         return true;
1209                 }
1210
1211                 return false;
1212         }
1213         /* We can always do async (rather than strict request/reply) packets.  */
1214         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1215                 return true;
1216         }
1217         return false;
1218 }
1219
1220 /*
1221  * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1222  * (for encrypting some passwords).
1223  *
1224  * This breaks all the abstractions, but what do you expect...
1225  */
1226 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1227                                           DATA_BLOB *session_key)
1228 {
1229         struct gensec_gssapi_state *gensec_gssapi_state
1230                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1231         OM_uint32 maj_stat, min_stat;
1232         krb5_keyblock *subkey;
1233
1234         if (gensec_gssapi_state->sasl_state != STAGE_DONE) {
1235                 return NT_STATUS_NO_USER_SESSION_KEY;
1236         }
1237
1238         if (gensec_gssapi_state->session_key.data) {
1239                 *session_key = gensec_gssapi_state->session_key;
1240                 return NT_STATUS_OK;
1241         }
1242
1243         maj_stat = gsskrb5_get_subkey(&min_stat,
1244                                       gensec_gssapi_state->gssapi_context,
1245                                       &subkey);
1246         if (maj_stat != 0) {
1247                 DEBUG(1, ("NO session key for this mech\n"));
1248                 return NT_STATUS_NO_USER_SESSION_KEY;
1249         }
1250
1251         DEBUG(10, ("Got KRB5 session key of length %d%s\n",
1252                    (int)KRB5_KEY_LENGTH(subkey),
1253                    (gensec_gssapi_state->sasl_state == STAGE_DONE)?" (done)":""));
1254         *session_key = data_blob_talloc(gensec_gssapi_state,
1255                                         KRB5_KEY_DATA(subkey), KRB5_KEY_LENGTH(subkey));
1256         krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context, subkey);
1257         gensec_gssapi_state->session_key = *session_key;
1258         dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
1259
1260         return NT_STATUS_OK;
1261 }
1262
1263 /* Get some basic (and authorization) information about the user on
1264  * this session.  This uses either the PAC (if present) or a local
1265  * database lookup */
1266 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1267                                            struct auth_session_info **_session_info)
1268 {
1269         NTSTATUS nt_status;
1270         TALLOC_CTX *mem_ctx;
1271         struct gensec_gssapi_state *gensec_gssapi_state
1272                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1273         struct auth_serversupplied_info *server_info = NULL;
1274         struct auth_session_info *session_info = NULL;
1275         OM_uint32 maj_stat, min_stat;
1276         gss_buffer_desc pac;
1277         DATA_BLOB pac_blob;
1278
1279         if ((gensec_gssapi_state->gss_oid->length != gss_mech_krb5->length)
1280             || (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
1281                        gensec_gssapi_state->gss_oid->length) != 0)) {
1282                 DEBUG(1, ("NO session info available for this mech\n"));
1283                 return NT_STATUS_INVALID_PARAMETER;
1284         }
1285
1286         mem_ctx = talloc_named(gensec_gssapi_state, 0, "gensec_gssapi_session_info context");
1287         NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
1288
1289         maj_stat = gsskrb5_extract_authz_data_from_sec_context(&min_stat,
1290                                                                gensec_gssapi_state->gssapi_context,
1291                                                                KRB5_AUTHDATA_WIN2K_PAC,
1292                                                                &pac);
1293
1294
1295         if (maj_stat == 0) {
1296                 pac_blob = data_blob_talloc(mem_ctx, pac.value, pac.length);
1297                 gss_release_buffer(&min_stat, &pac);
1298
1299         } else {
1300                 pac_blob = data_blob(NULL, 0);
1301         }
1302
1303         /* IF we have the PAC - otherwise we need to get this
1304          * data from elsewere - local ldb, or (TODO) lookup of some
1305          * kind...
1306          */
1307         if (pac_blob.length) {
1308                 nt_status = kerberos_pac_blob_to_server_info(mem_ctx,
1309                                                              pac_blob,
1310                                                              gensec_gssapi_state->smb_krb5_context->krb5_context,
1311                                                              &server_info);
1312                 if (!NT_STATUS_IS_OK(nt_status)) {
1313                         talloc_free(mem_ctx);
1314                         return nt_status;
1315                 }
1316         } else {
1317                 gss_buffer_desc name_token;
1318                 char *principal_string;
1319
1320                 maj_stat = gss_display_name (&min_stat,
1321                                              gensec_gssapi_state->client_name,
1322                                              &name_token,
1323                                              NULL);
1324                 if (GSS_ERROR(maj_stat)) {
1325                         DEBUG(1, ("GSS display_name failed: %s\n",
1326                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1327                         talloc_free(mem_ctx);
1328                         return NT_STATUS_FOOBAR;
1329                 }
1330
1331                 principal_string = talloc_strndup(mem_ctx,
1332                                                   (const char *)name_token.value,
1333                                                   name_token.length);
1334
1335                 gss_release_buffer(&min_stat, &name_token);
1336
1337                 if (!principal_string) {
1338                         talloc_free(mem_ctx);
1339                         return NT_STATUS_NO_MEMORY;
1340                 }
1341
1342                 if (gensec_security->auth_context &&
1343                     !gensec_setting_bool(gensec_security->settings, "gensec", "require_pac", false)) {
1344                         DEBUG(1, ("Unable to find PAC, resorting to local user lookup: %s\n",
1345                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1346                         nt_status = gensec_security->auth_context->get_server_info_principal(mem_ctx,
1347                                                                                              gensec_security->auth_context,
1348                                                                                              principal_string,
1349                                                                                              NULL,
1350                                                                                              &server_info);
1351
1352                         if (!NT_STATUS_IS_OK(nt_status)) {
1353                                 talloc_free(mem_ctx);
1354                                 return nt_status;
1355                         }
1356                 } else {
1357                         DEBUG(1, ("Unable to find PAC in ticket from %s, failing to allow access: %s\n",
1358                                   principal_string,
1359                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1360                         return NT_STATUS_ACCESS_DENIED;
1361                 }
1362         }
1363
1364         /* references the server_info into the session_info */
1365         nt_status = gensec_generate_session_info(mem_ctx, gensec_security,
1366                                                  server_info, &session_info);
1367         if (!NT_STATUS_IS_OK(nt_status)) {
1368                 talloc_free(mem_ctx);
1369                 return nt_status;
1370         }
1371
1372         nt_status = gensec_gssapi_session_key(gensec_security, &session_info->session_key);
1373         if (!NT_STATUS_IS_OK(nt_status)) {
1374                 talloc_free(mem_ctx);
1375                 return nt_status;
1376         }
1377
1378         if (!(gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG)) {
1379                 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1380         } else {
1381                 krb5_error_code ret;
1382                 const char *error_string;
1383
1384                 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1385                 session_info->credentials = cli_credentials_init(session_info);
1386                 if (!session_info->credentials) {
1387                         talloc_free(mem_ctx);
1388                         return NT_STATUS_NO_MEMORY;
1389                 }
1390
1391                 cli_credentials_set_conf(session_info->credentials, gensec_security->settings->lp_ctx);
1392                 /* Just so we don't segfault trying to get at a username */
1393                 cli_credentials_set_anonymous(session_info->credentials);
1394
1395                 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1396                                                            gensec_security->settings->lp_ctx,
1397                                                            gensec_gssapi_state->delegated_cred_handle,
1398                                                            CRED_SPECIFIED, &error_string);
1399                 if (ret) {
1400                         talloc_free(mem_ctx);
1401                         DEBUG(2,("Failed to get gss creds: %s\n", error_string));
1402                         return NT_STATUS_NO_MEMORY;
1403                 }
1404
1405                 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1406                 cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
1407
1408                 /* It has been taken from this place... */
1409                 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1410         }
1411         talloc_steal(gensec_gssapi_state, session_info);
1412         talloc_free(mem_ctx);
1413         *_session_info = session_info;
1414
1415         return NT_STATUS_OK;
1416 }
1417
1418 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
1419 {
1420         struct gensec_gssapi_state *gensec_gssapi_state
1421                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1422         NTSTATUS status;
1423
1424         if (gensec_gssapi_state->sig_size) {
1425                 return gensec_gssapi_state->sig_size;
1426         }
1427
1428         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1429                 gensec_gssapi_state->sig_size = 45;
1430         } else {
1431                 gensec_gssapi_state->sig_size = 37;
1432         }
1433
1434         status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1435         if (!NT_STATUS_IS_OK(status)) {
1436                 return gensec_gssapi_state->sig_size;
1437         }
1438
1439         if (gensec_gssapi_state->lucid->protocol == 1) {
1440                 if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1441                         /*
1442                          * TODO: windows uses 76 here, but we don't know
1443                          *       gss_wrap works with aes keys yet
1444                          */
1445                         gensec_gssapi_state->sig_size = 76;
1446                 } else {
1447                         gensec_gssapi_state->sig_size = 28;
1448                 }
1449         } else if (gensec_gssapi_state->lucid->protocol == 0) {
1450                 switch (gensec_gssapi_state->lucid->rfc1964_kd.ctx_key.type) {
1451                 case KEYTYPE_DES:
1452                 case KEYTYPE_ARCFOUR:
1453                 case KEYTYPE_ARCFOUR_56:
1454                         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1455                                 gensec_gssapi_state->sig_size = 45;
1456                         } else {
1457                                 gensec_gssapi_state->sig_size = 37;
1458                         }
1459                         break;
1460                 case KEYTYPE_DES3:
1461                         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1462                                 gensec_gssapi_state->sig_size = 57;
1463                         } else {
1464                                 gensec_gssapi_state->sig_size = 49;
1465                         }
1466                         break;
1467                 }
1468         }
1469
1470         return gensec_gssapi_state->sig_size;
1471 }
1472
1473 static const char *gensec_gssapi_krb5_oids[] = {
1474         GENSEC_OID_KERBEROS5_OLD,
1475         GENSEC_OID_KERBEROS5,
1476         NULL
1477 };
1478
1479 static const char *gensec_gssapi_spnego_oids[] = {
1480         GENSEC_OID_SPNEGO,
1481         NULL
1482 };
1483
1484 /* As a server, this could in theory accept any GSSAPI mech */
1485 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1486         .name           = "gssapi_spnego",
1487         .sasl_name      = "GSS-SPNEGO",
1488         .auth_type      = DCERPC_AUTH_TYPE_SPNEGO,
1489         .oid            = gensec_gssapi_spnego_oids,
1490         .client_start   = gensec_gssapi_client_start,
1491         .server_start   = gensec_gssapi_server_start,
1492         .magic          = gensec_gssapi_magic,
1493         .update         = gensec_gssapi_update,
1494         .session_key    = gensec_gssapi_session_key,
1495         .session_info   = gensec_gssapi_session_info,
1496         .sign_packet    = gensec_gssapi_sign_packet,
1497         .check_packet   = gensec_gssapi_check_packet,
1498         .seal_packet    = gensec_gssapi_seal_packet,
1499         .unseal_packet  = gensec_gssapi_unseal_packet,
1500         .wrap           = gensec_gssapi_wrap,
1501         .unwrap         = gensec_gssapi_unwrap,
1502         .have_feature   = gensec_gssapi_have_feature,
1503         .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_gssapi_magic,
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         .enabled        = true,
1528         .kerberos       = true,
1529         .priority       = GENSEC_GSSAPI
1530 };
1531
1532 /* As a server, this could in theory accept any GSSAPI mech */
1533 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1534         .name             = "gssapi_krb5_sasl",
1535         .sasl_name        = "GSSAPI",
1536         .client_start     = gensec_gssapi_sasl_client_start,
1537         .server_start     = gensec_gssapi_sasl_server_start,
1538         .update           = gensec_gssapi_update,
1539         .session_key      = gensec_gssapi_session_key,
1540         .session_info     = gensec_gssapi_session_info,
1541         .max_input_size   = gensec_gssapi_max_input_size,
1542         .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1543         .wrap             = gensec_gssapi_wrap,
1544         .unwrap           = gensec_gssapi_unwrap,
1545         .have_feature     = gensec_gssapi_have_feature,
1546         .enabled          = true,
1547         .kerberos         = true,
1548         .priority         = GENSEC_GSSAPI
1549 };
1550
1551 _PUBLIC_ NTSTATUS gensec_gssapi_init(void)
1552 {
1553         NTSTATUS ret;
1554
1555         ret = gensec_register(&gensec_gssapi_spnego_security_ops);
1556         if (!NT_STATUS_IS_OK(ret)) {
1557                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1558                         gensec_gssapi_spnego_security_ops.name));
1559                 return ret;
1560         }
1561
1562         ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1563         if (!NT_STATUS_IS_OK(ret)) {
1564                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1565                         gensec_gssapi_krb5_security_ops.name));
1566                 return ret;
1567         }
1568
1569         ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1570         if (!NT_STATUS_IS_OK(ret)) {
1571                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1572                         gensec_gssapi_sasl_krb5_security_ops.name));
1573                 return ret;
1574         }
1575
1576         return ret;
1577 }