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 <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 _PUBLIC_ NTSTATUS gensec_gssapi_init(void);
  46
  47 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security);
  48 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security);
  49
  50 static char *gssapi_error_string(TALLOC_CTX *mem_ctx,
  51                                  OM_uint32 maj_stat, OM_uint32 min_stat,
  52                                  const gss_OID mech)
  53 {
  54         OM_uint32 disp_min_stat, disp_maj_stat;
  55         gss_buffer_desc maj_error_message;
  56         gss_buffer_desc min_error_message;
  57         char *maj_error_string, *min_error_string;
  58         OM_uint32 msg_ctx = 0;
  59
  60         char *ret;
  61
  62         maj_error_message.value = NULL;
  63         min_error_message.value = NULL;
  64         maj_error_message.length = 0;
  65         min_error_message.length = 0;
  66
  67         disp_maj_stat = gss_display_status(&disp_min_stat, maj_stat, GSS_C_GSS_CODE,
  68                            mech, &msg_ctx, &maj_error_message);
  69         disp_maj_stat = gss_display_status(&disp_min_stat, min_stat, GSS_C_MECH_CODE,
  70                            mech, &msg_ctx, &min_error_message);
  71
  72         maj_error_string = talloc_strndup(mem_ctx, (char *)maj_error_message.value, maj_error_message.length);
  73
  74         min_error_string = talloc_strndup(mem_ctx, (char *)min_error_message.value, min_error_message.length);
  75
  76         ret = talloc_asprintf(mem_ctx, "%s: %s", maj_error_string, min_error_string);
  77
  78         talloc_free(maj_error_string);
  79         talloc_free(min_error_string);
  80
  81         gss_release_buffer(&disp_min_stat, &maj_error_message);
  82         gss_release_buffer(&disp_min_stat, &min_error_message);
  83
  84         return ret;
  85 }
  86
  87
  88 static int gensec_gssapi_destructor(struct gensec_gssapi_state *gensec_gssapi_state)
  89 {
  90         OM_uint32 maj_stat, min_stat;
  91
  92         if (gensec_gssapi_state->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
  93                 maj_stat = gss_release_cred(&min_stat,
  94                                             &gensec_gssapi_state->delegated_cred_handle);
  95         }
  96
  97         if (gensec_gssapi_state->gssapi_context != GSS_C_NO_CONTEXT) {
  98                 maj_stat = gss_delete_sec_context (&min_stat,
  99                                                    &gensec_gssapi_state->gssapi_context,
 100                                                    GSS_C_NO_BUFFER);
 101         }
 102
 103         if (gensec_gssapi_state->server_name != GSS_C_NO_NAME) {
 104                 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->server_name);
 105         }
 106         if (gensec_gssapi_state->client_name != GSS_C_NO_NAME) {
 107                 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->client_name);
 108         }
 109
 110         if (gensec_gssapi_state->lucid) {
 111                 gss_krb5_free_lucid_sec_context(&min_stat, gensec_gssapi_state->lucid);
 112         }
 113
 114         return 0;
 115 }
 116
 117 static NTSTATUS gensec_gssapi_init_lucid(struct gensec_gssapi_state *gensec_gssapi_state)
 118 {
 119         OM_uint32 maj_stat, min_stat;
 120
 121         if (gensec_gssapi_state->lucid) {
 122                 return NT_STATUS_OK;
 123         }
 124
 125         maj_stat = gss_krb5_export_lucid_sec_context(&min_stat,
 126                                                      &gensec_gssapi_state->gssapi_context,
 127                                                      1,
 128                                                      (void **)&gensec_gssapi_state->lucid);
 129         if (maj_stat != GSS_S_COMPLETE) {
 130                 DEBUG(0,("gensec_gssapi_init_lucid: %s\n",
 131                         gssapi_error_string(gensec_gssapi_state,
 132                                             maj_stat, min_stat,
 133                                             gensec_gssapi_state->gss_oid)));
 134                 return NT_STATUS_INTERNAL_ERROR;
 135         }
 136
 137         if (gensec_gssapi_state->lucid->version != 1) {
 138                 DEBUG(0,("gensec_gssapi_init_lucid: lucid version[%d] != 1\n",
 139                         gensec_gssapi_state->lucid->version));
 140                 gss_krb5_free_lucid_sec_context(&min_stat, gensec_gssapi_state->lucid);
 141                 gensec_gssapi_state->lucid = NULL;
 142                 return NT_STATUS_INTERNAL_ERROR;
 143         }
 144
 145         return NT_STATUS_OK;
 146 }
 147
 148 static NTSTATUS gensec_gssapi_start(struct gensec_security *gensec_security)
 149 {
 150         struct gensec_gssapi_state *gensec_gssapi_state;
 151         krb5_error_code ret;
 152         const char *realm;
 153
 154         gensec_gssapi_state = talloc_zero(gensec_security, struct gensec_gssapi_state);
 155         if (!gensec_gssapi_state) {
 156                 return NT_STATUS_NO_MEMORY;
 157         }
 158
 159         gensec_security->private_data = gensec_gssapi_state;
 160
 161         gensec_gssapi_state->gssapi_context = GSS_C_NO_CONTEXT;
 162
 163         /* TODO: Fill in channel bindings */
 164         gensec_gssapi_state->input_chan_bindings = GSS_C_NO_CHANNEL_BINDINGS;
 165
 166         gensec_gssapi_state->server_name = GSS_C_NO_NAME;
 167         gensec_gssapi_state->client_name = GSS_C_NO_NAME;
 168
 169         gensec_gssapi_state->want_flags = 0;
 170
 171         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation_by_kdc_policy", true)) {
 172                 gensec_gssapi_state->want_flags |= GSS_C_DELEG_POLICY_FLAG;
 173         }
 174         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "mutual", true)) {
 175                 gensec_gssapi_state->want_flags |= GSS_C_MUTUAL_FLAG;
 176         }
 177         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation", true)) {
 178                 gensec_gssapi_state->want_flags |= GSS_C_DELEG_FLAG;
 179         }
 180         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "replay", true)) {
 181                 gensec_gssapi_state->want_flags |= GSS_C_REPLAY_FLAG;
 182         }
 183         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "sequence", true)) {
 184                 gensec_gssapi_state->want_flags |= GSS_C_SEQUENCE_FLAG;
 185         }
 186
 187         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 188                 gensec_gssapi_state->want_flags |= GSS_C_INTEG_FLAG;
 189         }
 190         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 191                 gensec_gssapi_state->want_flags |= GSS_C_CONF_FLAG;
 192         }
 193         if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
 194                 gensec_gssapi_state->want_flags |= GSS_C_DCE_STYLE;
 195         }
 196
 197         gensec_gssapi_state->got_flags = 0;
 198
 199         switch (gensec_security->ops->auth_type) {
 200         case DCERPC_AUTH_TYPE_SPNEGO:
 201                 gensec_gssapi_state->gss_oid = gss_mech_spnego;
 202                 break;
 203         case DCERPC_AUTH_TYPE_KRB5:
 204         default:
 205                 gensec_gssapi_state->gss_oid = gss_mech_krb5;
 206                 break;
 207         }
 208
 209         gensec_gssapi_state->session_key = data_blob(NULL, 0);
 210         gensec_gssapi_state->pac = data_blob(NULL, 0);
 211
 212         ret = smb_krb5_init_context(gensec_gssapi_state,
 213                                     NULL,
 214                                     gensec_security->settings->lp_ctx,
 215                                     &gensec_gssapi_state->smb_krb5_context);
 216         if (ret) {
 217                 DEBUG(1,("gensec_krb5_start: krb5_init_context failed (%s)\n",
 218                          error_message(ret)));
 219                 talloc_free(gensec_gssapi_state);
 220                 return NT_STATUS_INTERNAL_ERROR;
 221         }
 222
 223         gensec_gssapi_state->client_cred = NULL;
 224         gensec_gssapi_state->server_cred = NULL;
 225
 226         gensec_gssapi_state->lucid = NULL;
 227
 228         gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
 229
 230         gensec_gssapi_state->sasl = false;
 231         gensec_gssapi_state->sasl_state = STAGE_GSS_NEG;
 232         gensec_gssapi_state->sasl_protection = 0;
 233
 234         gensec_gssapi_state->max_wrap_buf_size
 235                 = gensec_setting_int(gensec_security->settings, "gensec_gssapi", "max wrap buf size", 65536);
 236         gensec_gssapi_state->gss_exchange_count = 0;
 237         gensec_gssapi_state->sig_size = 0;
 238
 239         talloc_set_destructor(gensec_gssapi_state, gensec_gssapi_destructor);
 240
 241         realm = lpcfg_realm(gensec_security->settings->lp_ctx);
 242         if (realm != NULL) {
 243                 ret = gsskrb5_set_default_realm(realm);
 244                 if (ret) {
 245                         DEBUG(1,("gensec_krb5_start: gsskrb5_set_default_realm failed\n"));
 246                         talloc_free(gensec_gssapi_state);
 247                         return NT_STATUS_INTERNAL_ERROR;
 248                 }
 249         }
 250
 251         /* don't do DNS lookups of any kind, it might/will fail for a netbios name */
 252         ret = gsskrb5_set_dns_canonicalize(gensec_setting_bool(gensec_security->settings, "krb5", "set_dns_canonicalize", false));
 253         if (ret) {
 254                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_dns_canonicalize failed\n"));
 255                 talloc_free(gensec_gssapi_state);
 256                 return NT_STATUS_INTERNAL_ERROR;
 257         }
 258
 259         return NT_STATUS_OK;
 260 }
 261
 262 static NTSTATUS gensec_gssapi_server_start(struct gensec_security *gensec_security)
 263 {
 264         NTSTATUS nt_status;
 265         int ret;
 266         struct gensec_gssapi_state *gensec_gssapi_state;
 267         struct cli_credentials *machine_account;
 268         struct gssapi_creds_container *gcc;
 269
 270         nt_status = gensec_gssapi_start(gensec_security);
 271         if (!NT_STATUS_IS_OK(nt_status)) {
 272                 return nt_status;
 273         }
 274
 275         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 276
 277         machine_account = gensec_get_credentials(gensec_security);
 278
 279         if (!machine_account) {
 280                 DEBUG(3, ("No machine account credentials specified\n"));
 281                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 282         } else {
 283                 ret = cli_credentials_get_server_gss_creds(machine_account,
 284                                                            gensec_security->settings->lp_ctx, &gcc);
 285                 if (ret) {
 286                         DEBUG(1, ("Aquiring acceptor credentials failed: %s\n",
 287                                   error_message(ret)));
 288                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 289                 }
 290         }
 291
 292         gensec_gssapi_state->server_cred = gcc;
 293         return NT_STATUS_OK;
 294
 295 }
 296
 297 static NTSTATUS gensec_gssapi_sasl_server_start(struct gensec_security *gensec_security)
 298 {
 299         NTSTATUS nt_status;
 300         struct gensec_gssapi_state *gensec_gssapi_state;
 301         nt_status = gensec_gssapi_server_start(gensec_security);
 302
 303         if (NT_STATUS_IS_OK(nt_status)) {
 304                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 305                 gensec_gssapi_state->sasl = true;
 306         }
 307         return nt_status;
 308 }
 309
 310 static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_security)
 311 {
 312         struct gensec_gssapi_state *gensec_gssapi_state;
 313         struct cli_credentials *creds = gensec_get_credentials(gensec_security);
 314         krb5_error_code ret;
 315         NTSTATUS nt_status;
 316         gss_buffer_desc name_token;
 317         gss_OID name_type;
 318         OM_uint32 maj_stat, min_stat;
 319         const char *hostname = gensec_get_target_hostname(gensec_security);
 320         struct gssapi_creds_container *gcc;
 321         const char *error_string;
 322
 323         if (!hostname) {
 324                 DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
 325                 return NT_STATUS_INVALID_PARAMETER;
 326         }
 327         if (is_ipaddress(hostname)) {
 328                 DEBUG(2, ("Cannot do GSSAPI to an IP address\n"));
 329                 return NT_STATUS_INVALID_PARAMETER;
 330         }
 331         if (strcmp(hostname, "localhost") == 0) {
 332                 DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
 333                 return NT_STATUS_INVALID_PARAMETER;
 334         }
 335
 336         nt_status = gensec_gssapi_start(gensec_security);
 337         if (!NT_STATUS_IS_OK(nt_status)) {
 338                 return nt_status;
 339         }
 340
 341         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 342
 343         gensec_gssapi_state->target_principal = gensec_get_target_principal(gensec_security);
 344         if (gensec_gssapi_state->target_principal) {
 345                 name_type = GSS_C_NULL_OID;
 346         } else {
 347                 gensec_gssapi_state->target_principal = talloc_asprintf(gensec_gssapi_state, "%s/%s@%s",
 348                                             gensec_get_target_service(gensec_security),
 349                                             hostname, lpcfg_realm(gensec_security->settings->lp_ctx));
 350
 351                 name_type = GSS_C_NT_USER_NAME;
 352         }
 353         name_token.value  = discard_const_p(uint8_t, gensec_gssapi_state->target_principal);
 354         name_token.length = strlen(gensec_gssapi_state->target_principal);
 355
 356
 357         maj_stat = gss_import_name (&min_stat,
 358                                     &name_token,
 359                                     name_type,
 360                                     &gensec_gssapi_state->server_name);
 361         if (maj_stat) {
 362                 DEBUG(2, ("GSS Import name of %s failed: %s\n",
 363                           (char *)name_token.value,
 364                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 365                 return NT_STATUS_INVALID_PARAMETER;
 366         }
 367
 368         ret = cli_credentials_get_client_gss_creds(creds,
 369                                                    gensec_security->event_ctx,
 370                                                    gensec_security->settings->lp_ctx, &gcc, &error_string);
 371         switch (ret) {
 372         case 0:
 373                 break;
 374         case KRB5KDC_ERR_PREAUTH_FAILED:
 375         case KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN:
 376                 DEBUG(1, ("Wrong username or password: %s\n", error_string));
 377                 return NT_STATUS_LOGON_FAILURE;
 378         case KRB5_KDC_UNREACH:
 379                 DEBUG(3, ("Cannot reach a KDC we require to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
 380                 return NT_STATUS_NO_LOGON_SERVERS;
 381         case KRB5_CC_NOTFOUND:
 382         case KRB5_CC_END:
 383                 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));
 384                 return NT_STATUS_TIME_DIFFERENCE_AT_DC;
 385         default:
 386                 DEBUG(1, ("Aquiring initiator credentials failed: %s\n", error_string));
 387                 return NT_STATUS_UNSUCCESSFUL;
 388         }
 389
 390         gensec_gssapi_state->client_cred = gcc;
 391         if (!talloc_reference(gensec_gssapi_state, gcc)) {
 392                 return NT_STATUS_NO_MEMORY;
 393         }
 394
 395         return NT_STATUS_OK;
 396 }
 397
 398 static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
 399 {
 400         NTSTATUS nt_status;
 401         struct gensec_gssapi_state *gensec_gssapi_state;
 402         nt_status = gensec_gssapi_client_start(gensec_security);
 403
 404         if (NT_STATUS_IS_OK(nt_status)) {
 405                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 406                 gensec_gssapi_state->sasl = true;
 407         }
 408         return nt_status;
 409 }
 410
 411
 412 /**
 413  * Check if the packet is one for this mechansim
 414  *
 415  * @param gensec_security GENSEC state
 416  * @param in The request, as a DATA_BLOB
 417  * @return Error, INVALID_PARAMETER if it's not a packet for us
 418  *                or NT_STATUS_OK if the packet is ok.
 419  */
 420
 421 static NTSTATUS gensec_gssapi_magic(struct gensec_security *gensec_security,
 422                                     const DATA_BLOB *in)
 423 {
 424         if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
 425                 return NT_STATUS_OK;
 426         } else {
 427                 return NT_STATUS_INVALID_PARAMETER;
 428         }
 429 }
 430
 431
 432 /**
 433  * Next state function for the GSSAPI GENSEC mechanism
 434  *
 435  * @param gensec_gssapi_state GSSAPI State
 436  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 437  * @param in The request, as a DATA_BLOB
 438  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 439  * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
 440  *                or NT_STATUS_OK if the user is authenticated.
 441  */
 442
 443 static NTSTATUS gensec_gssapi_update(struct gensec_security *gensec_security,
 444                                    TALLOC_CTX *out_mem_ctx,
 445                                    const DATA_BLOB in, DATA_BLOB *out)
 446 {
 447         struct gensec_gssapi_state *gensec_gssapi_state
 448                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 449         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 450         OM_uint32 maj_stat, min_stat;
 451         OM_uint32 min_stat2;
 452         gss_buffer_desc input_token, output_token;
 453         gss_OID gss_oid_p = NULL;
 454         input_token.length = in.length;
 455         input_token.value = in.data;
 456
 457         switch (gensec_gssapi_state->sasl_state) {
 458         case STAGE_GSS_NEG:
 459         {
 460                 switch (gensec_security->gensec_role) {
 461                 case GENSEC_CLIENT:
 462                 {
 463                         struct gsskrb5_send_to_kdc send_to_kdc;
 464                         krb5_error_code ret;
 465                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 466                         send_to_kdc.ptr = gensec_security->event_ctx;
 467
 468                         min_stat = gsskrb5_set_send_to_kdc(&send_to_kdc);
 469                         if (min_stat) {
 470                                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
 471                                 return NT_STATUS_INTERNAL_ERROR;
 472                         }
 473
 474                         maj_stat = gss_init_sec_context(&min_stat,
 475                                                         gensec_gssapi_state->client_cred->creds,
 476                                                         &gensec_gssapi_state->gssapi_context,
 477                                                         gensec_gssapi_state->server_name,
 478                                                         gensec_gssapi_state->gss_oid,
 479                                                         gensec_gssapi_state->want_flags,
 480                                                         0,
 481                                                         gensec_gssapi_state->input_chan_bindings,
 482                                                         &input_token,
 483                                                         &gss_oid_p,
 484                                                         &output_token,
 485                                                         &gensec_gssapi_state->got_flags, /* ret flags */
 486                                                         NULL);
 487                         if (gss_oid_p) {
 488                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 489                         }
 490
 491                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 492                         send_to_kdc.ptr = NULL;
 493
 494                         ret = gsskrb5_set_send_to_kdc(&send_to_kdc);
 495                         if (ret) {
 496                                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
 497                                 return NT_STATUS_INTERNAL_ERROR;
 498                         }
 499
 500                         break;
 501                 }
 502                 case GENSEC_SERVER:
 503                 {
 504                         maj_stat = gss_accept_sec_context(&min_stat,
 505                                                           &gensec_gssapi_state->gssapi_context,
 506                                                           gensec_gssapi_state->server_cred->creds,
 507                                                           &input_token,
 508                                                           gensec_gssapi_state->input_chan_bindings,
 509                                                           &gensec_gssapi_state->client_name,
 510                                                           &gss_oid_p,
 511                                                           &output_token,
 512                                                           &gensec_gssapi_state->got_flags,
 513                                                           NULL,
 514                                                           &gensec_gssapi_state->delegated_cred_handle);
 515                         if (gss_oid_p) {
 516                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 517                         }
 518                         break;
 519                 }
 520                 default:
 521                         return NT_STATUS_INVALID_PARAMETER;
 522
 523                 }
 524
 525                 gensec_gssapi_state->gss_exchange_count++;
 526
 527                 if (maj_stat == GSS_S_COMPLETE) {
 528                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 529                         gss_release_buffer(&min_stat2, &output_token);
 530
 531                         if (gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG) {
 532                                 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
 533                         } else {
 534                                 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
 535                         }
 536
 537                         /* We may have been invoked as SASL, so there
 538                          * is more work to do */
 539                         if (gensec_gssapi_state->sasl) {
 540                                 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
 541                                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 542                         } else {
 543                                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 544
 545                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 546                                         DEBUG(5, ("GSSAPI Connection will be cryptographically sealed\n"));
 547                                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 548                                         DEBUG(5, ("GSSAPI Connection will be cryptographically signed\n"));
 549                                 } else {
 550                                         DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
 551                                 }
 552
 553                                 return NT_STATUS_OK;
 554                         }
 555                 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
 556                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 557                         gss_release_buffer(&min_stat2, &output_token);
 558
 559                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 560                 } else if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
 561                         switch (min_stat) {
 562                         case KRB5KRB_AP_ERR_TKT_NYV:
 563                                 DEBUG(1, ("Error with ticket to contact %s: possible clock skew between us and the KDC or target server: %s\n",
 564                                           gensec_gssapi_state->target_principal,
 565                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 566                                 return NT_STATUS_TIME_DIFFERENCE_AT_DC; /* Make SPNEGO ignore us, we can't go any further here */
 567                         case KRB5KRB_AP_ERR_TKT_EXPIRED:
 568                                 DEBUG(1, ("Error with ticket to contact %s: ticket is expired, possible clock skew between us and the KDC or target server: %s\n",
 569                                           gensec_gssapi_state->target_principal,
 570                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 571                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 572                         case KRB5_KDC_UNREACH:
 573                                 DEBUG(3, ("Cannot reach a KDC we require in order to obtain a ticetk to %s: %s\n",
 574                                           gensec_gssapi_state->target_principal,
 575                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 576                                 return NT_STATUS_NO_LOGON_SERVERS; /* Make SPNEGO ignore us, we can't go any further here */
 577                         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 578                                 DEBUG(3, ("Server %s is not registered with our KDC: %s\n",
 579                                           gensec_gssapi_state->target_principal,
 580                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 581                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 582                         case KRB5KRB_AP_ERR_MSG_TYPE:
 583                                 /* garbage input, possibly from the auto-mech detection */
 584                                 return NT_STATUS_INVALID_PARAMETER;
 585                         default:
 586                                 DEBUG(1, ("GSS %s Update(krb5)(%d) Update failed: %s\n",
 587                                           gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 588                                           gensec_gssapi_state->gss_exchange_count,
 589                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 590                                 return nt_status;
 591                         }
 592                 } else {
 593                         DEBUG(1, ("GSS %s Update(%d) failed: %s\n",
 594                                   gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 595                                   gensec_gssapi_state->gss_exchange_count,
 596                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 597                         return nt_status;
 598                 }
 599                 break;
 600         }
 601
 602         /* These last two stages are only done if we were invoked as SASL */
 603         case STAGE_SASL_SSF_NEG:
 604         {
 605                 switch (gensec_security->gensec_role) {
 606                 case GENSEC_CLIENT:
 607                 {
 608                         uint8_t maxlength_proposed[4];
 609                         uint8_t maxlength_accepted[4];
 610                         uint8_t security_supported;
 611                         int conf_state;
 612                         gss_qop_t qop_state;
 613                         input_token.length = in.length;
 614                         input_token.value = in.data;
 615
 616                         /* As a client, we have just send a
 617                          * zero-length blob to the server (after the
 618                          * normal GSSAPI exchange), and it has replied
 619                          * with it's SASL negotiation */
 620
 621                         maj_stat = gss_unwrap(&min_stat,
 622                                               gensec_gssapi_state->gssapi_context,
 623                                               &input_token,
 624                                               &output_token,
 625                                               &conf_state,
 626                                               &qop_state);
 627                         if (GSS_ERROR(maj_stat)) {
 628                                 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 629                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 630                                 return NT_STATUS_ACCESS_DENIED;
 631                         }
 632
 633                         if (output_token.length < 4) {
 634                                 return NT_STATUS_INVALID_PARAMETER;
 635                         }
 636
 637                         memcpy(maxlength_proposed, output_token.value, 4);
 638                         gss_release_buffer(&min_stat, &output_token);
 639
 640                         /* first byte is the proposed security */
 641                         security_supported = maxlength_proposed[0];
 642                         maxlength_proposed[0] = '\0';
 643
 644                         /* Rest is the proposed max wrap length */
 645                         gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
 646                                                                      gensec_gssapi_state->max_wrap_buf_size);
 647                         gensec_gssapi_state->sasl_protection = 0;
 648                         if (security_supported & NEG_SEAL) {
 649                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 650                                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 651                                 }
 652                         }
 653                         if (security_supported & NEG_SIGN) {
 654                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 655                                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 656                                 }
 657                         }
 658                         if (security_supported & NEG_NONE) {
 659                                 gensec_gssapi_state->sasl_protection |= NEG_NONE;
 660                         }
 661                         if (gensec_gssapi_state->sasl_protection == 0) {
 662                                 DEBUG(1, ("Remote server does not support unprotected connections\n"));
 663                                 return NT_STATUS_ACCESS_DENIED;
 664                         }
 665
 666                         /* Send back the negotiated max length */
 667
 668                         RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
 669
 670                         maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
 671
 672                         input_token.value = maxlength_accepted;
 673                         input_token.length = sizeof(maxlength_accepted);
 674
 675                         maj_stat = gss_wrap(&min_stat,
 676                                             gensec_gssapi_state->gssapi_context,
 677                                             false,
 678                                             GSS_C_QOP_DEFAULT,
 679                                             &input_token,
 680                                             &conf_state,
 681                                             &output_token);
 682                         if (GSS_ERROR(maj_stat)) {
 683                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 684                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 685                                 return NT_STATUS_ACCESS_DENIED;
 686                         }
 687
 688                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 689                         gss_release_buffer(&min_stat, &output_token);
 690
 691                         /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 692                         gensec_gssapi_state->sasl_state = STAGE_DONE;
 693
 694                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 695                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically sealed\n"));
 696                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 697                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically signed\n"));
 698                         } else {
 699                                 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographically protection\n"));
 700                         }
 701
 702                         return NT_STATUS_OK;
 703                 }
 704                 case GENSEC_SERVER:
 705                 {
 706                         uint8_t maxlength_proposed[4];
 707                         uint8_t security_supported = 0x0;
 708                         int conf_state;
 709
 710                         /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
 711                         if (in.length != 0) {
 712                                 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
 713                         }
 714
 715                         /* Give the client some idea what we will support */
 716
 717                         RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
 718                         /* first byte is the proposed security */
 719                         maxlength_proposed[0] = '\0';
 720
 721                         gensec_gssapi_state->sasl_protection = 0;
 722                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 723                                 security_supported |= NEG_SEAL;
 724                         }
 725                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 726                                 security_supported |= NEG_SIGN;
 727                         }
 728                         if (security_supported == 0) {
 729                                 /* If we don't support anything, this must be 0 */
 730                                 RSIVAL(maxlength_proposed, 0, 0x0);
 731                         }
 732
 733                         /* TODO:  We may not wish to support this */
 734                         security_supported |= NEG_NONE;
 735                         maxlength_proposed[0] = security_supported;
 736
 737                         input_token.value = maxlength_proposed;
 738                         input_token.length = sizeof(maxlength_proposed);
 739
 740                         maj_stat = gss_wrap(&min_stat,
 741                                             gensec_gssapi_state->gssapi_context,
 742                                             false,
 743                                             GSS_C_QOP_DEFAULT,
 744                                             &input_token,
 745                                             &conf_state,
 746                                             &output_token);
 747                         if (GSS_ERROR(maj_stat)) {
 748                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 749                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 750                                 return NT_STATUS_ACCESS_DENIED;
 751                         }
 752
 753                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 754                         gss_release_buffer(&min_stat, &output_token);
 755
 756                         gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
 757                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 758                 }
 759                 default:
 760                         return NT_STATUS_INVALID_PARAMETER;
 761
 762                 }
 763         }
 764         /* This is s server-only stage */
 765         case STAGE_SASL_SSF_ACCEPT:
 766         {
 767                 uint8_t maxlength_accepted[4];
 768                 uint8_t security_accepted;
 769                 int conf_state;
 770                 gss_qop_t qop_state;
 771                 input_token.length = in.length;
 772                 input_token.value = in.data;
 773
 774                 maj_stat = gss_unwrap(&min_stat,
 775                                       gensec_gssapi_state->gssapi_context,
 776                                       &input_token,
 777                                       &output_token,
 778                                       &conf_state,
 779                                       &qop_state);
 780                 if (GSS_ERROR(maj_stat)) {
 781                         DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 782                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 783                         return NT_STATUS_ACCESS_DENIED;
 784                 }
 785
 786                 if (output_token.length < 4) {
 787                         return NT_STATUS_INVALID_PARAMETER;
 788                 }
 789
 790                 memcpy(maxlength_accepted, output_token.value, 4);
 791                 gss_release_buffer(&min_stat, &output_token);
 792
 793                 /* first byte is the proposed security */
 794                 security_accepted = maxlength_accepted[0];
 795                 maxlength_accepted[0] = '\0';
 796
 797                 /* Rest is the proposed max wrap length */
 798                 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
 799                                                              gensec_gssapi_state->max_wrap_buf_size);
 800
 801                 gensec_gssapi_state->sasl_protection = 0;
 802                 if (security_accepted & NEG_SEAL) {
 803                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 804                                 DEBUG(1, ("Remote client wanted seal, but gensec refused\n"));
 805                                 return NT_STATUS_ACCESS_DENIED;
 806                         }
 807                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 808                 }
 809                 if (security_accepted & NEG_SIGN) {
 810                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 811                                 DEBUG(1, ("Remote client wanted sign, but gensec refused\n"));
 812                                 return NT_STATUS_ACCESS_DENIED;
 813                         }
 814                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 815                 }
 816                 if (security_accepted & NEG_NONE) {
 817                         gensec_gssapi_state->sasl_protection |= NEG_NONE;
 818                 }
 819
 820                 /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 821                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 822                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 823                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically sealed\n"));
 824                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 825                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically signed\n"));
 826                 } else {
 827                         DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
 828                 }
 829
 830                 *out = data_blob(NULL, 0);
 831                 return NT_STATUS_OK;
 832         }
 833         default:
 834                 return NT_STATUS_INVALID_PARAMETER;
 835         }
 836 }
 837
 838 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
 839                                    TALLOC_CTX *mem_ctx,
 840                                    const DATA_BLOB *in,
 841                                    DATA_BLOB *out)
 842 {
 843         struct gensec_gssapi_state *gensec_gssapi_state
 844                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 845         OM_uint32 maj_stat, min_stat;
 846         gss_buffer_desc input_token, output_token;
 847         int conf_state;
 848         input_token.length = in->length;
 849         input_token.value = in->data;
 850
 851         maj_stat = gss_wrap(&min_stat,
 852                             gensec_gssapi_state->gssapi_context,
 853                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 854                             GSS_C_QOP_DEFAULT,
 855                             &input_token,
 856                             &conf_state,
 857                             &output_token);
 858         if (GSS_ERROR(maj_stat)) {
 859                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 860                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 861                 return NT_STATUS_ACCESS_DENIED;
 862         }
 863
 864         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 865         gss_release_buffer(&min_stat, &output_token);
 866
 867         if (gensec_gssapi_state->sasl) {
 868                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 869                 if (max_wrapped_size < out->length) {
 870                         DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
 871                                   (unsigned)in->length,
 872                                   (unsigned)out->length,
 873                                   (unsigned int)max_wrapped_size));
 874                         return NT_STATUS_INVALID_PARAMETER;
 875                 }
 876         }
 877
 878         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 879             && !conf_state) {
 880                 return NT_STATUS_ACCESS_DENIED;
 881         }
 882         return NT_STATUS_OK;
 883 }
 884
 885 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
 886                                      TALLOC_CTX *mem_ctx,
 887                                      const DATA_BLOB *in,
 888                                      DATA_BLOB *out)
 889 {
 890         struct gensec_gssapi_state *gensec_gssapi_state
 891                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 892         OM_uint32 maj_stat, min_stat;
 893         gss_buffer_desc input_token, output_token;
 894         int conf_state;
 895         gss_qop_t qop_state;
 896         input_token.length = in->length;
 897         input_token.value = in->data;
 898
 899         if (gensec_gssapi_state->sasl) {
 900                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 901                 if (max_wrapped_size < in->length) {
 902                         DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
 903                         return NT_STATUS_INVALID_PARAMETER;
 904                 }
 905         }
 906
 907         maj_stat = gss_unwrap(&min_stat,
 908                               gensec_gssapi_state->gssapi_context,
 909                               &input_token,
 910                               &output_token,
 911                               &conf_state,
 912                               &qop_state);
 913         if (GSS_ERROR(maj_stat)) {
 914                 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
 915                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 916                 return NT_STATUS_ACCESS_DENIED;
 917         }
 918
 919         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 920         gss_release_buffer(&min_stat, &output_token);
 921
 922         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 923             && !conf_state) {
 924                 return NT_STATUS_ACCESS_DENIED;
 925         }
 926         return NT_STATUS_OK;
 927 }
 928
 929 /* Find out the maximum input size negotiated on this connection */
 930
 931 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
 932 {
 933         struct gensec_gssapi_state *gensec_gssapi_state
 934                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 935         OM_uint32 maj_stat, min_stat;
 936         OM_uint32 max_input_size;
 937
 938         maj_stat = gss_wrap_size_limit(&min_stat,
 939                                        gensec_gssapi_state->gssapi_context,
 940                                        gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 941                                        GSS_C_QOP_DEFAULT,
 942                                        gensec_gssapi_state->max_wrap_buf_size,
 943                                        &max_input_size);
 944         if (GSS_ERROR(maj_stat)) {
 945                 TALLOC_CTX *mem_ctx = talloc_new(NULL);
 946                 DEBUG(1, ("gensec_gssapi_max_input_size: determinaing signature size with gss_wrap_size_limit failed: %s\n",
 947                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 948                 talloc_free(mem_ctx);
 949                 return 0;
 950         }
 951
 952         return max_input_size;
 953 }
 954
 955 /* Find out the maximum output size negotiated on this connection */
 956 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
 957 {
 958         struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
 959         return gensec_gssapi_state->max_wrap_buf_size;
 960 }
 961
 962 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
 963                                           TALLOC_CTX *mem_ctx,
 964                                           uint8_t *data, size_t length,
 965                                           const uint8_t *whole_pdu, size_t pdu_length,
 966                                           DATA_BLOB *sig)
 967 {
 968         struct gensec_gssapi_state *gensec_gssapi_state
 969                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 970         OM_uint32 maj_stat, min_stat;
 971         gss_buffer_desc input_token, output_token;
 972         int conf_state;
 973         ssize_t sig_length;
 974
 975         input_token.length = length;
 976         input_token.value = data;
 977
 978         maj_stat = gss_wrap(&min_stat,
 979                             gensec_gssapi_state->gssapi_context,
 980                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 981                             GSS_C_QOP_DEFAULT,
 982                             &input_token,
 983                             &conf_state,
 984                             &output_token);
 985         if (GSS_ERROR(maj_stat)) {
 986                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
 987                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 988                 return NT_STATUS_ACCESS_DENIED;
 989         }
 990
 991         if (output_token.length < input_token.length) {
 992                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
 993                           (long)output_token.length, (long)length));
 994                 return NT_STATUS_INTERNAL_ERROR;
 995         }
 996         sig_length = output_token.length - input_token.length;
 997
 998         memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
 999         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
1000
1001         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1002         dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
1003         dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
1004
1005         gss_release_buffer(&min_stat, &output_token);
1006
1007         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1008             && !conf_state) {
1009                 return NT_STATUS_ACCESS_DENIED;
1010         }
1011         return NT_STATUS_OK;
1012 }
1013
1014 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
1015                                             TALLOC_CTX *mem_ctx,
1016                                             uint8_t *data, size_t length,
1017                                             const uint8_t *whole_pdu, size_t pdu_length,
1018                                             const DATA_BLOB *sig)
1019 {
1020         struct gensec_gssapi_state *gensec_gssapi_state
1021                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1022         OM_uint32 maj_stat, min_stat;
1023         gss_buffer_desc input_token, output_token;
1024         int conf_state;
1025         gss_qop_t qop_state;
1026         DATA_BLOB in;
1027
1028         dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
1029
1030         in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
1031
1032         memcpy(in.data, sig->data, sig->length);
1033         memcpy(in.data + sig->length, data, length);
1034
1035         input_token.length = in.length;
1036         input_token.value = in.data;
1037
1038         maj_stat = gss_unwrap(&min_stat,
1039                               gensec_gssapi_state->gssapi_context,
1040                               &input_token,
1041                               &output_token,
1042                               &conf_state,
1043                               &qop_state);
1044         if (GSS_ERROR(maj_stat)) {
1045                 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
1046                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1047                 return NT_STATUS_ACCESS_DENIED;
1048         }
1049
1050         if (output_token.length != length) {
1051                 return NT_STATUS_INTERNAL_ERROR;
1052         }
1053
1054         memcpy(data, output_token.value, length);
1055
1056         gss_release_buffer(&min_stat, &output_token);
1057
1058         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1059             && !conf_state) {
1060                 return NT_STATUS_ACCESS_DENIED;
1061         }
1062         return NT_STATUS_OK;
1063 }
1064
1065 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1066                                           TALLOC_CTX *mem_ctx,
1067                                           const uint8_t *data, size_t length,
1068                                           const uint8_t *whole_pdu, size_t pdu_length,
1069                                           DATA_BLOB *sig)
1070 {
1071         struct gensec_gssapi_state *gensec_gssapi_state
1072                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1073         OM_uint32 maj_stat, min_stat;
1074         gss_buffer_desc input_token, output_token;
1075
1076         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1077                 input_token.length = pdu_length;
1078                 input_token.value = discard_const_p(uint8_t *, whole_pdu);
1079         } else {
1080                 input_token.length = length;
1081                 input_token.value = discard_const_p(uint8_t *, data);
1082         }
1083
1084         maj_stat = gss_get_mic(&min_stat,
1085                             gensec_gssapi_state->gssapi_context,
1086                             GSS_C_QOP_DEFAULT,
1087                             &input_token,
1088                             &output_token);
1089         if (GSS_ERROR(maj_stat)) {
1090                 DEBUG(1, ("GSS GetMic failed: %s\n",
1091                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1092                 return NT_STATUS_ACCESS_DENIED;
1093         }
1094
1095         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, output_token.length);
1096
1097         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1098
1099         gss_release_buffer(&min_stat, &output_token);
1100
1101         return NT_STATUS_OK;
1102 }
1103
1104 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1105                                            TALLOC_CTX *mem_ctx,
1106                                            const uint8_t *data, size_t length,
1107                                            const uint8_t *whole_pdu, size_t pdu_length,
1108                                            const DATA_BLOB *sig)
1109 {
1110         struct gensec_gssapi_state *gensec_gssapi_state
1111                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1112         OM_uint32 maj_stat, min_stat;
1113         gss_buffer_desc input_token;
1114         gss_buffer_desc input_message;
1115         gss_qop_t qop_state;
1116
1117         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1118
1119         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1120                 input_message.length = pdu_length;
1121                 input_message.value = discard_const(whole_pdu);
1122         } else {
1123                 input_message.length = length;
1124                 input_message.value = discard_const(data);
1125         }
1126
1127         input_token.length = sig->length;
1128         input_token.value = sig->data;
1129
1130         maj_stat = gss_verify_mic(&min_stat,
1131                               gensec_gssapi_state->gssapi_context,
1132                               &input_message,
1133                               &input_token,
1134                               &qop_state);
1135         if (GSS_ERROR(maj_stat)) {
1136                 DEBUG(1, ("GSS VerifyMic failed: %s\n",
1137                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1138                 return NT_STATUS_ACCESS_DENIED;
1139         }
1140
1141         return NT_STATUS_OK;
1142 }
1143
1144 /* Try to figure out what features we actually got on the connection */
1145 static bool gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1146                                        uint32_t feature)
1147 {
1148         struct gensec_gssapi_state *gensec_gssapi_state
1149                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1150         if (feature & GENSEC_FEATURE_SIGN) {
1151                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1152                 if (gensec_gssapi_state->sasl
1153                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1154                         return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1155                                 && (gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG));
1156                 }
1157                 return gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG;
1158         }
1159         if (feature & GENSEC_FEATURE_SEAL) {
1160                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1161                 if (gensec_gssapi_state->sasl
1162                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1163                         return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1164                                  && (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG));
1165                 }
1166                 return gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG;
1167         }
1168         if (feature & GENSEC_FEATURE_SESSION_KEY) {
1169                 /* Only for GSSAPI/Krb5 */
1170                 if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
1171                         return true;
1172                 }
1173         }
1174         if (feature & GENSEC_FEATURE_DCE_STYLE) {
1175                 return gensec_gssapi_state->got_flags & GSS_C_DCE_STYLE;
1176         }
1177         if (feature & GENSEC_FEATURE_NEW_SPNEGO) {
1178                 NTSTATUS status;
1179
1180                 if (!(gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG)) {
1181                         return false;
1182                 }
1183
1184                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "force_new_spnego", false)) {
1185                         return true;
1186                 }
1187                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "disable_new_spnego", false)) {
1188                         return false;
1189                 }
1190
1191                 status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1192                 if (!NT_STATUS_IS_OK(status)) {
1193                         return false;
1194                 }
1195
1196                 if (gensec_gssapi_state->lucid->protocol == 1) {
1197                         return true;
1198                 }
1199
1200                 return false;
1201         }
1202         /* We can always do async (rather than strict request/reply) packets.  */
1203         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1204                 return true;
1205         }
1206         return false;
1207 }
1208
1209 /*
1210  * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1211  * (for encrypting some passwords).
1212  *
1213  * This breaks all the abstractions, but what do you expect...
1214  */
1215 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1216                                           DATA_BLOB *session_key)
1217 {
1218         struct gensec_gssapi_state *gensec_gssapi_state
1219                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1220         OM_uint32 maj_stat, min_stat;
1221         krb5_keyblock *subkey;
1222
1223         if (gensec_gssapi_state->sasl_state != STAGE_DONE) {
1224                 return NT_STATUS_NO_USER_SESSION_KEY;
1225         }
1226
1227         if (gensec_gssapi_state->session_key.data) {
1228                 *session_key = gensec_gssapi_state->session_key;
1229                 return NT_STATUS_OK;
1230         }
1231
1232         maj_stat = gsskrb5_get_subkey(&min_stat,
1233                                       gensec_gssapi_state->gssapi_context,
1234                                       &subkey);
1235         if (maj_stat != 0) {
1236                 DEBUG(1, ("NO session key for this mech\n"));
1237                 return NT_STATUS_NO_USER_SESSION_KEY;
1238         }
1239
1240         DEBUG(10, ("Got KRB5 session key of length %d%s\n",
1241                    (int)KRB5_KEY_LENGTH(subkey),
1242                    (gensec_gssapi_state->sasl_state == STAGE_DONE)?" (done)":""));
1243         *session_key = data_blob_talloc(gensec_gssapi_state,
1244                                         KRB5_KEY_DATA(subkey), KRB5_KEY_LENGTH(subkey));
1245         krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context, subkey);
1246         gensec_gssapi_state->session_key = *session_key;
1247         dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
1248
1249         return NT_STATUS_OK;
1250 }
1251
1252 /* Get some basic (and authorization) information about the user on
1253  * this session.  This uses either the PAC (if present) or a local
1254  * database lookup */
1255 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1256                                            struct auth_session_info **_session_info)
1257 {
1258         NTSTATUS nt_status;
1259         TALLOC_CTX *mem_ctx;
1260         struct gensec_gssapi_state *gensec_gssapi_state
1261                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1262         struct auth_user_info_dc *user_info_dc = NULL;
1263         struct auth_session_info *session_info = NULL;
1264         OM_uint32 maj_stat, min_stat;
1265         gss_buffer_desc pac;
1266         DATA_BLOB pac_blob;
1267         struct PAC_SIGNATURE_DATA *pac_srv_sig = NULL;
1268         struct PAC_SIGNATURE_DATA *pac_kdc_sig = NULL;
1269
1270         if ((gensec_gssapi_state->gss_oid->length != gss_mech_krb5->length)
1271             || (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
1272                        gensec_gssapi_state->gss_oid->length) != 0)) {
1273                 DEBUG(1, ("NO session info available for this mech\n"));
1274                 return NT_STATUS_INVALID_PARAMETER;
1275         }
1276
1277         mem_ctx = talloc_named(gensec_gssapi_state, 0, "gensec_gssapi_session_info context");
1278         NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
1279
1280         maj_stat = gsskrb5_extract_authz_data_from_sec_context(&min_stat,
1281                                                                gensec_gssapi_state->gssapi_context,
1282                                                                KRB5_AUTHDATA_WIN2K_PAC,
1283                                                                &pac);
1284
1285
1286         if (maj_stat == 0) {
1287                 pac_blob = data_blob_talloc(mem_ctx, pac.value, pac.length);
1288                 gss_release_buffer(&min_stat, &pac);
1289
1290         } else {
1291                 pac_blob = data_blob(NULL, 0);
1292         }
1293
1294         /* IF we have the PAC - otherwise we need to get this
1295          * data from elsewere - local ldb, or (TODO) lookup of some
1296          * kind...
1297          */
1298         if (pac_blob.length) {
1299                 pac_srv_sig = talloc(mem_ctx, struct PAC_SIGNATURE_DATA);
1300                 if (!pac_srv_sig) {
1301                         talloc_free(mem_ctx);
1302                         return NT_STATUS_NO_MEMORY;
1303                 }
1304                 pac_kdc_sig = talloc(mem_ctx, struct PAC_SIGNATURE_DATA);
1305                 if (!pac_kdc_sig) {
1306                         talloc_free(mem_ctx);
1307                         return NT_STATUS_NO_MEMORY;
1308                 }
1309
1310                 nt_status = kerberos_pac_blob_to_user_info_dc(mem_ctx,
1311                                                               pac_blob,
1312                                                               gensec_gssapi_state->smb_krb5_context->krb5_context,
1313                                                               &user_info_dc,
1314                                                               pac_srv_sig,
1315                                                               pac_kdc_sig);
1316                 if (!NT_STATUS_IS_OK(nt_status)) {
1317                         talloc_free(mem_ctx);
1318                         return nt_status;
1319                 }
1320         } else {
1321                 gss_buffer_desc name_token;
1322                 char *principal_string;
1323
1324                 maj_stat = gss_display_name (&min_stat,
1325                                              gensec_gssapi_state->client_name,
1326                                              &name_token,
1327                                              NULL);
1328                 if (GSS_ERROR(maj_stat)) {
1329                         DEBUG(1, ("GSS display_name failed: %s\n",
1330                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1331                         talloc_free(mem_ctx);
1332                         return NT_STATUS_FOOBAR;
1333                 }
1334
1335                 principal_string = talloc_strndup(mem_ctx,
1336                                                   (const char *)name_token.value,
1337                                                   name_token.length);
1338
1339                 gss_release_buffer(&min_stat, &name_token);
1340
1341                 if (!principal_string) {
1342                         talloc_free(mem_ctx);
1343                         return NT_STATUS_NO_MEMORY;
1344                 }
1345
1346                 if (gensec_security->auth_context &&
1347                     !gensec_setting_bool(gensec_security->settings, "gensec", "require_pac", false)) {
1348                         DEBUG(1, ("Unable to find PAC, resorting to local user lookup: %s\n",
1349                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1350                         nt_status = gensec_security->auth_context->get_user_info_dc_principal(mem_ctx,
1351                                                                                              gensec_security->auth_context,
1352                                                                                              principal_string,
1353                                                                                              NULL,
1354                                                                                              &user_info_dc);
1355
1356                         if (!NT_STATUS_IS_OK(nt_status)) {
1357                                 talloc_free(mem_ctx);
1358                                 return nt_status;
1359                         }
1360                 } else {
1361                         DEBUG(1, ("Unable to find PAC in ticket from %s, failing to allow access: %s\n",
1362                                   principal_string,
1363                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1364                         return NT_STATUS_ACCESS_DENIED;
1365                 }
1366         }
1367
1368         /* references the user_info_dc into the session_info */
1369         nt_status = gensec_generate_session_info(mem_ctx, gensec_security,
1370                                                  user_info_dc, &session_info);
1371         if (!NT_STATUS_IS_OK(nt_status)) {
1372                 talloc_free(mem_ctx);
1373                 return nt_status;
1374         }
1375
1376         nt_status = gensec_gssapi_session_key(gensec_security, &session_info->session_key);
1377         if (!NT_STATUS_IS_OK(nt_status)) {
1378                 talloc_free(mem_ctx);
1379                 return nt_status;
1380         }
1381
1382         /* Allow torture tests to check the PAC signatures */
1383         if (session_info->torture) {
1384                 session_info->torture->pac_srv_sig = talloc_steal(session_info->torture, pac_srv_sig);
1385                 session_info->torture->pac_kdc_sig = talloc_steal(session_info->torture, pac_kdc_sig);
1386         }
1387
1388         if (!(gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG)) {
1389                 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1390         } else {
1391                 krb5_error_code ret;
1392                 const char *error_string;
1393
1394                 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1395                 session_info->credentials = cli_credentials_init(session_info);
1396                 if (!session_info->credentials) {
1397                         talloc_free(mem_ctx);
1398                         return NT_STATUS_NO_MEMORY;
1399                 }
1400
1401                 cli_credentials_set_conf(session_info->credentials, gensec_security->settings->lp_ctx);
1402                 /* Just so we don't segfault trying to get at a username */
1403                 cli_credentials_set_anonymous(session_info->credentials);
1404
1405                 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1406                                                            gensec_security->settings->lp_ctx,
1407                                                            gensec_gssapi_state->delegated_cred_handle,
1408                                                            CRED_SPECIFIED, &error_string);
1409                 if (ret) {
1410                         talloc_free(mem_ctx);
1411                         DEBUG(2,("Failed to get gss creds: %s\n", error_string));
1412                         return NT_STATUS_NO_MEMORY;
1413                 }
1414
1415                 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1416                 cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
1417
1418                 /* It has been taken from this place... */
1419                 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1420         }
1421         talloc_steal(gensec_gssapi_state, session_info);
1422         talloc_free(mem_ctx);
1423         *_session_info = session_info;
1424
1425         return NT_STATUS_OK;
1426 }
1427
1428 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
1429 {
1430         struct gensec_gssapi_state *gensec_gssapi_state
1431                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1432         NTSTATUS status;
1433
1434         if (gensec_gssapi_state->sig_size) {
1435                 return gensec_gssapi_state->sig_size;
1436         }
1437
1438         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1439                 gensec_gssapi_state->sig_size = 45;
1440         } else {
1441                 gensec_gssapi_state->sig_size = 37;
1442         }
1443
1444         status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1445         if (!NT_STATUS_IS_OK(status)) {
1446                 return gensec_gssapi_state->sig_size;
1447         }
1448
1449         if (gensec_gssapi_state->lucid->protocol == 1) {
1450                 if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1451                         /*
1452                          * TODO: windows uses 76 here, but we don't know
1453                          *       gss_wrap works with aes keys yet
1454                          */
1455                         gensec_gssapi_state->sig_size = 76;
1456                 } else {
1457                         gensec_gssapi_state->sig_size = 28;
1458                 }
1459         } else if (gensec_gssapi_state->lucid->protocol == 0) {
1460                 switch (gensec_gssapi_state->lucid->rfc1964_kd.ctx_key.type) {
1461                 case KEYTYPE_DES:
1462                 case KEYTYPE_ARCFOUR:
1463                 case KEYTYPE_ARCFOUR_56:
1464                         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1465                                 gensec_gssapi_state->sig_size = 45;
1466                         } else {
1467                                 gensec_gssapi_state->sig_size = 37;
1468                         }
1469                         break;
1470                 case KEYTYPE_DES3:
1471                         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1472                                 gensec_gssapi_state->sig_size = 57;
1473                         } else {
1474                                 gensec_gssapi_state->sig_size = 49;
1475                         }
1476                         break;
1477                 }
1478         }
1479
1480         return gensec_gssapi_state->sig_size;
1481 }
1482
1483 static const char *gensec_gssapi_krb5_oids[] = {
1484         GENSEC_OID_KERBEROS5_OLD,
1485         GENSEC_OID_KERBEROS5,
1486         NULL
1487 };
1488
1489 static const char *gensec_gssapi_spnego_oids[] = {
1490         GENSEC_OID_SPNEGO,
1491         NULL
1492 };
1493
1494 /* As a server, this could in theory accept any GSSAPI mech */
1495 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1496         .name           = "gssapi_spnego",
1497         .sasl_name      = "GSS-SPNEGO",
1498         .auth_type      = DCERPC_AUTH_TYPE_SPNEGO,
1499         .oid            = gensec_gssapi_spnego_oids,
1500         .client_start   = gensec_gssapi_client_start,
1501         .server_start   = gensec_gssapi_server_start,
1502         .magic          = gensec_gssapi_magic,
1503         .update         = gensec_gssapi_update,
1504         .session_key    = gensec_gssapi_session_key,
1505         .session_info   = gensec_gssapi_session_info,
1506         .sign_packet    = gensec_gssapi_sign_packet,
1507         .check_packet   = gensec_gssapi_check_packet,
1508         .seal_packet    = gensec_gssapi_seal_packet,
1509         .unseal_packet  = gensec_gssapi_unseal_packet,
1510         .wrap           = gensec_gssapi_wrap,
1511         .unwrap         = gensec_gssapi_unwrap,
1512         .have_feature   = gensec_gssapi_have_feature,
1513         .enabled        = false,
1514         .kerberos       = true,
1515         .priority       = GENSEC_GSSAPI
1516 };
1517
1518 /* As a server, this could in theory accept any GSSAPI mech */
1519 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1520         .name           = "gssapi_krb5",
1521         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
1522         .oid            = gensec_gssapi_krb5_oids,
1523         .client_start   = gensec_gssapi_client_start,
1524         .server_start   = gensec_gssapi_server_start,
1525         .magic          = gensec_gssapi_magic,
1526         .update         = gensec_gssapi_update,
1527         .session_key    = gensec_gssapi_session_key,
1528         .session_info   = gensec_gssapi_session_info,
1529         .sig_size       = gensec_gssapi_sig_size,
1530         .sign_packet    = gensec_gssapi_sign_packet,
1531         .check_packet   = gensec_gssapi_check_packet,
1532         .seal_packet    = gensec_gssapi_seal_packet,
1533         .unseal_packet  = gensec_gssapi_unseal_packet,
1534         .wrap           = gensec_gssapi_wrap,
1535         .unwrap         = gensec_gssapi_unwrap,
1536         .have_feature   = gensec_gssapi_have_feature,
1537         .enabled        = true,
1538         .kerberos       = true,
1539         .priority       = GENSEC_GSSAPI
1540 };
1541
1542 /* As a server, this could in theory accept any GSSAPI mech */
1543 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1544         .name             = "gssapi_krb5_sasl",
1545         .sasl_name        = "GSSAPI",
1546         .client_start     = gensec_gssapi_sasl_client_start,
1547         .server_start     = gensec_gssapi_sasl_server_start,
1548         .update           = gensec_gssapi_update,
1549         .session_key      = gensec_gssapi_session_key,
1550         .session_info     = gensec_gssapi_session_info,
1551         .max_input_size   = gensec_gssapi_max_input_size,
1552         .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1553         .wrap             = gensec_gssapi_wrap,
1554         .unwrap           = gensec_gssapi_unwrap,
1555         .have_feature     = gensec_gssapi_have_feature,
1556         .enabled          = true,
1557         .kerberos         = true,
1558         .priority         = GENSEC_GSSAPI
1559 };
1560
1561 _PUBLIC_ NTSTATUS gensec_gssapi_init(void)
1562 {
1563         NTSTATUS ret;
1564
1565         ret = gensec_register(&gensec_gssapi_spnego_security_ops);
1566         if (!NT_STATUS_IS_OK(ret)) {
1567                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1568                         gensec_gssapi_spnego_security_ops.name));
1569                 return ret;
1570         }
1571
1572         ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1573         if (!NT_STATUS_IS_OK(ret)) {
1574                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1575                         gensec_gssapi_krb5_security_ops.name));
1576                 return ret;
1577         }
1578
1579         ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1580         if (!NT_STATUS_IS_OK(ret)) {
1581                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1582                         gensec_gssapi_sasl_krb5_security_ops.name));
1583                 return ret;
1584         }
1585
1586         return ret;
1587 }