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(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                 return NT_STATUS_LOGON_FAILURE;
 374         case KRB5_KDC_UNREACH:
 375                 DEBUG(3, ("Cannot reach a KDC we require to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
 376                 return NT_STATUS_NO_LOGON_SERVERS;
 377         case KRB5_CC_NOTFOUND:
 378         case KRB5_CC_END:
 379                 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));
 380                 return NT_STATUS_TIME_DIFFERENCE_AT_DC;
 381         default:
 382                 DEBUG(1, ("Aquiring initiator credentials failed: %s\n", error_string));
 383                 return NT_STATUS_UNSUCCESSFUL;
 384         }
 385
 386         gensec_gssapi_state->client_cred = gcc;
 387         if (!talloc_reference(gensec_gssapi_state, gcc)) {
 388                 return NT_STATUS_NO_MEMORY;
 389         }
 390
 391         return NT_STATUS_OK;
 392 }
 393
 394 static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
 395 {
 396         NTSTATUS nt_status;
 397         struct gensec_gssapi_state *gensec_gssapi_state;
 398         nt_status = gensec_gssapi_client_start(gensec_security);
 399
 400         if (NT_STATUS_IS_OK(nt_status)) {
 401                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 402                 gensec_gssapi_state->sasl = true;
 403         }
 404         return nt_status;
 405 }
 406
 407
 408 /**
 409  * Check if the packet is one for this mechansim
 410  *
 411  * @param gensec_security GENSEC state
 412  * @param in The request, as a DATA_BLOB
 413  * @return Error, INVALID_PARAMETER if it's not a packet for us
 414  *                or NT_STATUS_OK if the packet is ok.
 415  */
 416
 417 static NTSTATUS gensec_gssapi_magic(struct gensec_security *gensec_security,
 418                                     const DATA_BLOB *in)
 419 {
 420         if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
 421                 return NT_STATUS_OK;
 422         } else {
 423                 return NT_STATUS_INVALID_PARAMETER;
 424         }
 425 }
 426
 427
 428 /**
 429  * Next state function for the GSSAPI GENSEC mechanism
 430  *
 431  * @param gensec_gssapi_state GSSAPI State
 432  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 433  * @param in The request, as a DATA_BLOB
 434  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 435  * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
 436  *                or NT_STATUS_OK if the user is authenticated.
 437  */
 438
 439 static NTSTATUS gensec_gssapi_update(struct gensec_security *gensec_security,
 440                                    TALLOC_CTX *out_mem_ctx,
 441                                    const DATA_BLOB in, DATA_BLOB *out)
 442 {
 443         struct gensec_gssapi_state *gensec_gssapi_state
 444                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 445         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 446         OM_uint32 maj_stat, min_stat;
 447         OM_uint32 min_stat2;
 448         gss_buffer_desc input_token, output_token;
 449         gss_OID gss_oid_p = NULL;
 450         input_token.length = in.length;
 451         input_token.value = in.data;
 452
 453         switch (gensec_gssapi_state->sasl_state) {
 454         case STAGE_GSS_NEG:
 455         {
 456                 switch (gensec_security->gensec_role) {
 457                 case GENSEC_CLIENT:
 458                 {
 459                         struct gsskrb5_send_to_kdc send_to_kdc;
 460                         krb5_error_code ret;
 461                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 462                         send_to_kdc.ptr = gensec_security->event_ctx;
 463
 464                         min_stat = gsskrb5_set_send_to_kdc(&send_to_kdc);
 465                         if (min_stat) {
 466                                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
 467                                 return NT_STATUS_INTERNAL_ERROR;
 468                         }
 469
 470                         maj_stat = gss_init_sec_context(&min_stat,
 471                                                         gensec_gssapi_state->client_cred->creds,
 472                                                         &gensec_gssapi_state->gssapi_context,
 473                                                         gensec_gssapi_state->server_name,
 474                                                         gensec_gssapi_state->gss_oid,
 475                                                         gensec_gssapi_state->want_flags,
 476                                                         0,
 477                                                         gensec_gssapi_state->input_chan_bindings,
 478                                                         &input_token,
 479                                                         &gss_oid_p,
 480                                                         &output_token,
 481                                                         &gensec_gssapi_state->got_flags, /* ret flags */
 482                                                         NULL);
 483                         if (gss_oid_p) {
 484                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 485                         }
 486
 487                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 488                         send_to_kdc.ptr = NULL;
 489
 490                         ret = gsskrb5_set_send_to_kdc(&send_to_kdc);
 491                         if (ret) {
 492                                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
 493                                 return NT_STATUS_INTERNAL_ERROR;
 494                         }
 495
 496                         break;
 497                 }
 498                 case GENSEC_SERVER:
 499                 {
 500                         maj_stat = gss_accept_sec_context(&min_stat,
 501                                                           &gensec_gssapi_state->gssapi_context,
 502                                                           gensec_gssapi_state->server_cred->creds,
 503                                                           &input_token,
 504                                                           gensec_gssapi_state->input_chan_bindings,
 505                                                           &gensec_gssapi_state->client_name,
 506                                                           &gss_oid_p,
 507                                                           &output_token,
 508                                                           &gensec_gssapi_state->got_flags,
 509                                                           NULL,
 510                                                           &gensec_gssapi_state->delegated_cred_handle);
 511                         if (gss_oid_p) {
 512                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 513                         }
 514                         break;
 515                 }
 516                 default:
 517                         return NT_STATUS_INVALID_PARAMETER;
 518
 519                 }
 520
 521                 gensec_gssapi_state->gss_exchange_count++;
 522
 523                 if (maj_stat == GSS_S_COMPLETE) {
 524                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 525                         gss_release_buffer(&min_stat2, &output_token);
 526
 527                         if (gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG) {
 528                                 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
 529                         } else {
 530                                 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
 531                         }
 532
 533                         /* We may have been invoked as SASL, so there
 534                          * is more work to do */
 535                         if (gensec_gssapi_state->sasl) {
 536                                 /* Due to a very subtle interaction
 537                                  * with SASL and the LDAP libs, we
 538                                  * must ensure the data pointer is
 539                                  * != NULL, but the length is 0.
 540                                  *
 541                                  * This ensures we send a 'zero
 542                                  * length' (rather than NULL) response
 543                                  */
 544
 545                                 if (!out->data) {
 546                                         out->data = (uint8_t *)talloc_strdup(out_mem_ctx, "\0");
 547                                 }
 548
 549                                 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
 550                                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 551                         } else {
 552                                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 553
 554                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 555                                         DEBUG(5, ("GSSAPI Connection will be cryptographically sealed\n"));
 556                                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 557                                         DEBUG(5, ("GSSAPI Connection will be cryptographically signed\n"));
 558                                 } else {
 559                                         DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
 560                                 }
 561
 562                                 return NT_STATUS_OK;
 563                         }
 564                 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
 565                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 566                         gss_release_buffer(&min_stat2, &output_token);
 567
 568                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 569                 } else if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
 570                         switch (min_stat) {
 571                         case KRB5KRB_AP_ERR_TKT_NYV:
 572                                 DEBUG(1, ("Error with ticket to contact %s: possible clock skew between us and the KDC or target server: %s\n",
 573                                           gensec_gssapi_state->target_principal,
 574                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 575                                 return NT_STATUS_TIME_DIFFERENCE_AT_DC; /* Make SPNEGO ignore us, we can't go any further here */
 576                         case KRB5KRB_AP_ERR_TKT_EXPIRED:
 577                                 DEBUG(1, ("Error with ticket to contact %s: ticket is expired, possible clock skew between us and the KDC or target server: %s\n",
 578                                           gensec_gssapi_state->target_principal,
 579                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 580                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 581                         case KRB5_KDC_UNREACH:
 582                                 DEBUG(3, ("Cannot reach a KDC we require in order to obtain a ticetk to %s: %s\n",
 583                                           gensec_gssapi_state->target_principal,
 584                                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 585                                 return NT_STATUS_NO_LOGON_SERVERS; /* Make SPNEGO ignore us, we can't go any further here */
 586                         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 587                                 DEBUG(3, ("Server %s is not registered with our KDC: %s\n",
 588                                           gensec_gssapi_state->target_principal,
 589                                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 590                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 591                         case KRB5KRB_AP_ERR_MSG_TYPE:
 592                                 /* garbage input, possibly from the auto-mech detection */
 593                                 return NT_STATUS_INVALID_PARAMETER;
 594                         default:
 595                                 DEBUG(1, ("GSS Update(krb5)(%d) Update failed: %s\n",
 596                                           gensec_gssapi_state->gss_exchange_count,
 597                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 598                                 return nt_status;
 599                         }
 600                 } else {
 601                         DEBUG(1, ("GSS Update(%d) failed: %s\n",
 602                                   gensec_gssapi_state->gss_exchange_count,
 603                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 604                         return nt_status;
 605                 }
 606                 break;
 607         }
 608
 609         /* These last two stages are only done if we were invoked as SASL */
 610         case STAGE_SASL_SSF_NEG:
 611         {
 612                 switch (gensec_security->gensec_role) {
 613                 case GENSEC_CLIENT:
 614                 {
 615                         uint8_t maxlength_proposed[4];
 616                         uint8_t maxlength_accepted[4];
 617                         uint8_t security_supported;
 618                         int conf_state;
 619                         gss_qop_t qop_state;
 620                         input_token.length = in.length;
 621                         input_token.value = in.data;
 622
 623                         /* As a client, we have just send a
 624                          * zero-length blob to the server (after the
 625                          * normal GSSAPI exchange), and it has replied
 626                          * with it's SASL negotiation */
 627
 628                         maj_stat = gss_unwrap(&min_stat,
 629                                               gensec_gssapi_state->gssapi_context,
 630                                               &input_token,
 631                                               &output_token,
 632                                               &conf_state,
 633                                               &qop_state);
 634                         if (GSS_ERROR(maj_stat)) {
 635                                 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 636                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 637                                 return NT_STATUS_ACCESS_DENIED;
 638                         }
 639
 640                         if (output_token.length < 4) {
 641                                 return NT_STATUS_INVALID_PARAMETER;
 642                         }
 643
 644                         memcpy(maxlength_proposed, output_token.value, 4);
 645                         gss_release_buffer(&min_stat, &output_token);
 646
 647                         /* first byte is the proposed security */
 648                         security_supported = maxlength_proposed[0];
 649                         maxlength_proposed[0] = '\0';
 650
 651                         /* Rest is the proposed max wrap length */
 652                         gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
 653                                                                      gensec_gssapi_state->max_wrap_buf_size);
 654                         gensec_gssapi_state->sasl_protection = 0;
 655                         if (security_supported & NEG_SEAL) {
 656                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 657                                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 658                                 }
 659                         }
 660                         if (security_supported & NEG_SIGN) {
 661                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 662                                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 663                                 }
 664                         }
 665                         if (security_supported & NEG_NONE) {
 666                                 gensec_gssapi_state->sasl_protection |= NEG_NONE;
 667                         }
 668                         if (gensec_gssapi_state->sasl_protection == 0) {
 669                                 DEBUG(1, ("Remote server does not support unprotected connections\n"));
 670                                 return NT_STATUS_ACCESS_DENIED;
 671                         }
 672
 673                         /* Send back the negotiated max length */
 674
 675                         RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
 676
 677                         maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
 678
 679                         input_token.value = maxlength_accepted;
 680                         input_token.length = sizeof(maxlength_accepted);
 681
 682                         maj_stat = gss_wrap(&min_stat,
 683                                             gensec_gssapi_state->gssapi_context,
 684                                             false,
 685                                             GSS_C_QOP_DEFAULT,
 686                                             &input_token,
 687                                             &conf_state,
 688                                             &output_token);
 689                         if (GSS_ERROR(maj_stat)) {
 690                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 691                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 692                                 return NT_STATUS_ACCESS_DENIED;
 693                         }
 694
 695                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 696                         gss_release_buffer(&min_stat, &output_token);
 697
 698                         /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 699                         gensec_gssapi_state->sasl_state = STAGE_DONE;
 700
 701                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 702                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically sealed\n"));
 703                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 704                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically signed\n"));
 705                         } else {
 706                                 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographically protection\n"));
 707                         }
 708
 709                         return NT_STATUS_OK;
 710                 }
 711                 case GENSEC_SERVER:
 712                 {
 713                         uint8_t maxlength_proposed[4];
 714                         uint8_t security_supported = 0x0;
 715                         int conf_state;
 716
 717                         /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
 718                         if (in.length != 0) {
 719                                 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
 720                         }
 721
 722                         /* Give the client some idea what we will support */
 723
 724                         RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
 725                         /* first byte is the proposed security */
 726                         maxlength_proposed[0] = '\0';
 727
 728                         gensec_gssapi_state->sasl_protection = 0;
 729                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 730                                 security_supported |= NEG_SEAL;
 731                         }
 732                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 733                                 security_supported |= NEG_SIGN;
 734                         }
 735                         if (security_supported == 0) {
 736                                 /* If we don't support anything, this must be 0 */
 737                                 RSIVAL(maxlength_proposed, 0, 0x0);
 738                         }
 739
 740                         /* TODO:  We may not wish to support this */
 741                         security_supported |= NEG_NONE;
 742                         maxlength_proposed[0] = security_supported;
 743
 744                         input_token.value = maxlength_proposed;
 745                         input_token.length = sizeof(maxlength_proposed);
 746
 747                         maj_stat = gss_wrap(&min_stat,
 748                                             gensec_gssapi_state->gssapi_context,
 749                                             false,
 750                                             GSS_C_QOP_DEFAULT,
 751                                             &input_token,
 752                                             &conf_state,
 753                                             &output_token);
 754                         if (GSS_ERROR(maj_stat)) {
 755                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 756                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 757                                 return NT_STATUS_ACCESS_DENIED;
 758                         }
 759
 760                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 761                         gss_release_buffer(&min_stat, &output_token);
 762
 763                         gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
 764                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 765                 }
 766                 default:
 767                         return NT_STATUS_INVALID_PARAMETER;
 768
 769                 }
 770         }
 771         /* This is s server-only stage */
 772         case STAGE_SASL_SSF_ACCEPT:
 773         {
 774                 uint8_t maxlength_accepted[4];
 775                 uint8_t security_accepted;
 776                 int conf_state;
 777                 gss_qop_t qop_state;
 778                 input_token.length = in.length;
 779                 input_token.value = in.data;
 780
 781                 maj_stat = gss_unwrap(&min_stat,
 782                                       gensec_gssapi_state->gssapi_context,
 783                                       &input_token,
 784                                       &output_token,
 785                                       &conf_state,
 786                                       &qop_state);
 787                 if (GSS_ERROR(maj_stat)) {
 788                         DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 789                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 790                         return NT_STATUS_ACCESS_DENIED;
 791                 }
 792
 793                 if (output_token.length < 4) {
 794                         return NT_STATUS_INVALID_PARAMETER;
 795                 }
 796
 797                 memcpy(maxlength_accepted, output_token.value, 4);
 798                 gss_release_buffer(&min_stat, &output_token);
 799
 800                 /* first byte is the proposed security */
 801                 security_accepted = maxlength_accepted[0];
 802                 maxlength_accepted[0] = '\0';
 803
 804                 /* Rest is the proposed max wrap length */
 805                 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
 806                                                              gensec_gssapi_state->max_wrap_buf_size);
 807
 808                 gensec_gssapi_state->sasl_protection = 0;
 809                 if (security_accepted & NEG_SEAL) {
 810                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 811                                 DEBUG(1, ("Remote client wanted seal, but gensec refused\n"));
 812                                 return NT_STATUS_ACCESS_DENIED;
 813                         }
 814                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 815                 }
 816                 if (security_accepted & NEG_SIGN) {
 817                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 818                                 DEBUG(1, ("Remote client wanted sign, but gensec refused\n"));
 819                                 return NT_STATUS_ACCESS_DENIED;
 820                         }
 821                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 822                 }
 823                 if (security_accepted & NEG_NONE) {
 824                         gensec_gssapi_state->sasl_protection |= NEG_NONE;
 825                 }
 826
 827                 /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 828                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 829                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 830                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically sealed\n"));
 831                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 832                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically signed\n"));
 833                 } else {
 834                         DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
 835                 }
 836
 837                 *out = data_blob(NULL, 0);
 838                 return NT_STATUS_OK;
 839         }
 840         default:
 841                 return NT_STATUS_INVALID_PARAMETER;
 842         }
 843 }
 844
 845 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
 846                                    TALLOC_CTX *mem_ctx,
 847                                    const DATA_BLOB *in,
 848                                    DATA_BLOB *out)
 849 {
 850         struct gensec_gssapi_state *gensec_gssapi_state
 851                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 852         OM_uint32 maj_stat, min_stat;
 853         gss_buffer_desc input_token, output_token;
 854         int conf_state;
 855         input_token.length = in->length;
 856         input_token.value = in->data;
 857
 858         maj_stat = gss_wrap(&min_stat,
 859                             gensec_gssapi_state->gssapi_context,
 860                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 861                             GSS_C_QOP_DEFAULT,
 862                             &input_token,
 863                             &conf_state,
 864                             &output_token);
 865         if (GSS_ERROR(maj_stat)) {
 866                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 867                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 868                 return NT_STATUS_ACCESS_DENIED;
 869         }
 870
 871         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 872         gss_release_buffer(&min_stat, &output_token);
 873
 874         if (gensec_gssapi_state->sasl) {
 875                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 876                 if (max_wrapped_size < out->length) {
 877                         DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
 878                                   (unsigned)in->length,
 879                                   (unsigned)out->length,
 880                                   (unsigned int)max_wrapped_size));
 881                         return NT_STATUS_INVALID_PARAMETER;
 882                 }
 883         }
 884
 885         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 886             && !conf_state) {
 887                 return NT_STATUS_ACCESS_DENIED;
 888         }
 889         return NT_STATUS_OK;
 890 }
 891
 892 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
 893                                      TALLOC_CTX *mem_ctx,
 894                                      const DATA_BLOB *in,
 895                                      DATA_BLOB *out)
 896 {
 897         struct gensec_gssapi_state *gensec_gssapi_state
 898                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 899         OM_uint32 maj_stat, min_stat;
 900         gss_buffer_desc input_token, output_token;
 901         int conf_state;
 902         gss_qop_t qop_state;
 903         input_token.length = in->length;
 904         input_token.value = in->data;
 905
 906         if (gensec_gssapi_state->sasl) {
 907                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 908                 if (max_wrapped_size < in->length) {
 909                         DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
 910                         return NT_STATUS_INVALID_PARAMETER;
 911                 }
 912         }
 913
 914         maj_stat = gss_unwrap(&min_stat,
 915                               gensec_gssapi_state->gssapi_context,
 916                               &input_token,
 917                               &output_token,
 918                               &conf_state,
 919                               &qop_state);
 920         if (GSS_ERROR(maj_stat)) {
 921                 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
 922                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 923                 return NT_STATUS_ACCESS_DENIED;
 924         }
 925
 926         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 927         gss_release_buffer(&min_stat, &output_token);
 928
 929         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 930             && !conf_state) {
 931                 return NT_STATUS_ACCESS_DENIED;
 932         }
 933         return NT_STATUS_OK;
 934 }
 935
 936 /* Find out the maximum input size negotiated on this connection */
 937
 938 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
 939 {
 940         struct gensec_gssapi_state *gensec_gssapi_state
 941                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 942         OM_uint32 maj_stat, min_stat;
 943         OM_uint32 max_input_size;
 944
 945         maj_stat = gss_wrap_size_limit(&min_stat,
 946                                        gensec_gssapi_state->gssapi_context,
 947                                        gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 948                                        GSS_C_QOP_DEFAULT,
 949                                        gensec_gssapi_state->max_wrap_buf_size,
 950                                        &max_input_size);
 951         if (GSS_ERROR(maj_stat)) {
 952                 TALLOC_CTX *mem_ctx = talloc_new(NULL);
 953                 DEBUG(1, ("gensec_gssapi_max_input_size: determinaing signature size with gss_wrap_size_limit failed: %s\n",
 954                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 955                 talloc_free(mem_ctx);
 956                 return 0;
 957         }
 958
 959         return max_input_size;
 960 }
 961
 962 /* Find out the maximum output size negotiated on this connection */
 963 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
 964 {
 965         struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
 966         return gensec_gssapi_state->max_wrap_buf_size;
 967 }
 968
 969 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
 970                                           TALLOC_CTX *mem_ctx,
 971                                           uint8_t *data, size_t length,
 972                                           const uint8_t *whole_pdu, size_t pdu_length,
 973                                           DATA_BLOB *sig)
 974 {
 975         struct gensec_gssapi_state *gensec_gssapi_state
 976                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 977         OM_uint32 maj_stat, min_stat;
 978         gss_buffer_desc input_token, output_token;
 979         int conf_state;
 980         ssize_t sig_length;
 981
 982         input_token.length = length;
 983         input_token.value = data;
 984
 985         maj_stat = gss_wrap(&min_stat,
 986                             gensec_gssapi_state->gssapi_context,
 987                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 988                             GSS_C_QOP_DEFAULT,
 989                             &input_token,
 990                             &conf_state,
 991                             &output_token);
 992         if (GSS_ERROR(maj_stat)) {
 993                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
 994                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 995                 return NT_STATUS_ACCESS_DENIED;
 996         }
 997
 998         if (output_token.length < input_token.length) {
 999                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
1000                           (long)output_token.length, (long)length));
1001                 return NT_STATUS_INTERNAL_ERROR;
1002         }
1003         sig_length = output_token.length - input_token.length;
1004
1005         memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
1006         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
1007
1008         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1009         dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
1010         dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
1011
1012         gss_release_buffer(&min_stat, &output_token);
1013
1014         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1015             && !conf_state) {
1016                 return NT_STATUS_ACCESS_DENIED;
1017         }
1018         return NT_STATUS_OK;
1019 }
1020
1021 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
1022                                             TALLOC_CTX *mem_ctx,
1023                                             uint8_t *data, size_t length,
1024                                             const uint8_t *whole_pdu, size_t pdu_length,
1025                                             const DATA_BLOB *sig)
1026 {
1027         struct gensec_gssapi_state *gensec_gssapi_state
1028                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1029         OM_uint32 maj_stat, min_stat;
1030         gss_buffer_desc input_token, output_token;
1031         int conf_state;
1032         gss_qop_t qop_state;
1033         DATA_BLOB in;
1034
1035         dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
1036
1037         in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
1038
1039         memcpy(in.data, sig->data, sig->length);
1040         memcpy(in.data + sig->length, data, length);
1041
1042         input_token.length = in.length;
1043         input_token.value = in.data;
1044
1045         maj_stat = gss_unwrap(&min_stat,
1046                               gensec_gssapi_state->gssapi_context,
1047                               &input_token,
1048                               &output_token,
1049                               &conf_state,
1050                               &qop_state);
1051         if (GSS_ERROR(maj_stat)) {
1052                 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
1053                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1054                 return NT_STATUS_ACCESS_DENIED;
1055         }
1056
1057         if (output_token.length != length) {
1058                 return NT_STATUS_INTERNAL_ERROR;
1059         }
1060
1061         memcpy(data, output_token.value, length);
1062
1063         gss_release_buffer(&min_stat, &output_token);
1064
1065         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1066             && !conf_state) {
1067                 return NT_STATUS_ACCESS_DENIED;
1068         }
1069         return NT_STATUS_OK;
1070 }
1071
1072 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1073                                           TALLOC_CTX *mem_ctx,
1074                                           const uint8_t *data, size_t length,
1075                                           const uint8_t *whole_pdu, size_t pdu_length,
1076                                           DATA_BLOB *sig)
1077 {
1078         struct gensec_gssapi_state *gensec_gssapi_state
1079                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1080         OM_uint32 maj_stat, min_stat;
1081         gss_buffer_desc input_token, output_token;
1082
1083         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1084                 input_token.length = pdu_length;
1085                 input_token.value = discard_const_p(uint8_t *, whole_pdu);
1086         } else {
1087                 input_token.length = length;
1088                 input_token.value = discard_const_p(uint8_t *, data);
1089         }
1090
1091         maj_stat = gss_get_mic(&min_stat,
1092                             gensec_gssapi_state->gssapi_context,
1093                             GSS_C_QOP_DEFAULT,
1094                             &input_token,
1095                             &output_token);
1096         if (GSS_ERROR(maj_stat)) {
1097                 DEBUG(1, ("GSS GetMic failed: %s\n",
1098                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1099                 return NT_STATUS_ACCESS_DENIED;
1100         }
1101
1102         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, output_token.length);
1103
1104         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1105
1106         gss_release_buffer(&min_stat, &output_token);
1107
1108         return NT_STATUS_OK;
1109 }
1110
1111 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1112                                            TALLOC_CTX *mem_ctx,
1113                                            const uint8_t *data, size_t length,
1114                                            const uint8_t *whole_pdu, size_t pdu_length,
1115                                            const DATA_BLOB *sig)
1116 {
1117         struct gensec_gssapi_state *gensec_gssapi_state
1118                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1119         OM_uint32 maj_stat, min_stat;
1120         gss_buffer_desc input_token;
1121         gss_buffer_desc input_message;
1122         gss_qop_t qop_state;
1123
1124         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1125
1126         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1127                 input_message.length = pdu_length;
1128                 input_message.value = discard_const(whole_pdu);
1129         } else {
1130                 input_message.length = length;
1131                 input_message.value = discard_const(data);
1132         }
1133
1134         input_token.length = sig->length;
1135         input_token.value = sig->data;
1136
1137         maj_stat = gss_verify_mic(&min_stat,
1138                               gensec_gssapi_state->gssapi_context,
1139                               &input_message,
1140                               &input_token,
1141                               &qop_state);
1142         if (GSS_ERROR(maj_stat)) {
1143                 DEBUG(1, ("GSS VerifyMic failed: %s\n",
1144                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1145                 return NT_STATUS_ACCESS_DENIED;
1146         }
1147
1148         return NT_STATUS_OK;
1149 }
1150
1151 /* Try to figure out what features we actually got on the connection */
1152 static bool gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1153                                        uint32_t feature)
1154 {
1155         struct gensec_gssapi_state *gensec_gssapi_state
1156                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1157         if (feature & GENSEC_FEATURE_SIGN) {
1158                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1159                 if (gensec_gssapi_state->sasl
1160                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1161                         return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1162                                 && (gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG));
1163                 }
1164                 return gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG;
1165         }
1166         if (feature & GENSEC_FEATURE_SEAL) {
1167                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1168                 if (gensec_gssapi_state->sasl
1169                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1170                         return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1171                                  && (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG));
1172                 }
1173                 return gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG;
1174         }
1175         if (feature & GENSEC_FEATURE_SESSION_KEY) {
1176                 /* Only for GSSAPI/Krb5 */
1177                 if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
1178                         return true;
1179                 }
1180         }
1181         if (feature & GENSEC_FEATURE_DCE_STYLE) {
1182                 return gensec_gssapi_state->got_flags & GSS_C_DCE_STYLE;
1183         }
1184         if (feature & GENSEC_FEATURE_NEW_SPNEGO) {
1185                 NTSTATUS status;
1186
1187                 if (!(gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG)) {
1188                         return false;
1189                 }
1190
1191                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "force_new_spnego", false)) {
1192                         return true;
1193                 }
1194                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "disable_new_spnego", false)) {
1195                         return false;
1196                 }
1197
1198                 status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1199                 if (!NT_STATUS_IS_OK(status)) {
1200                         return false;
1201                 }
1202
1203                 if (gensec_gssapi_state->lucid->protocol == 1) {
1204                         return true;
1205                 }
1206
1207                 return false;
1208         }
1209         /* We can always do async (rather than strict request/reply) packets.  */
1210         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1211                 return true;
1212         }
1213         return false;
1214 }
1215
1216 /*
1217  * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1218  * (for encrypting some passwords).
1219  *
1220  * This breaks all the abstractions, but what do you expect...
1221  */
1222 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1223                                           DATA_BLOB *session_key)
1224 {
1225         struct gensec_gssapi_state *gensec_gssapi_state
1226                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1227         OM_uint32 maj_stat, min_stat;
1228         krb5_keyblock *subkey;
1229
1230         if (gensec_gssapi_state->sasl_state != STAGE_DONE) {
1231                 return NT_STATUS_NO_USER_SESSION_KEY;
1232         }
1233
1234         if (gensec_gssapi_state->session_key.data) {
1235                 *session_key = gensec_gssapi_state->session_key;
1236                 return NT_STATUS_OK;
1237         }
1238
1239         maj_stat = gsskrb5_get_subkey(&min_stat,
1240                                       gensec_gssapi_state->gssapi_context,
1241                                       &subkey);
1242         if (maj_stat != 0) {
1243                 DEBUG(1, ("NO session key for this mech\n"));
1244                 return NT_STATUS_NO_USER_SESSION_KEY;
1245         }
1246
1247         DEBUG(10, ("Got KRB5 session key of length %d%s\n",
1248                    (int)KRB5_KEY_LENGTH(subkey),
1249                    (gensec_gssapi_state->sasl_state == STAGE_DONE)?" (done)":""));
1250         *session_key = data_blob_talloc(gensec_gssapi_state,
1251                                         KRB5_KEY_DATA(subkey), KRB5_KEY_LENGTH(subkey));
1252         krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context, subkey);
1253         gensec_gssapi_state->session_key = *session_key;
1254         dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
1255
1256         return NT_STATUS_OK;
1257 }
1258
1259 /* Get some basic (and authorization) information about the user on
1260  * this session.  This uses either the PAC (if present) or a local
1261  * database lookup */
1262 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1263                                            struct auth_session_info **_session_info)
1264 {
1265         NTSTATUS nt_status;
1266         TALLOC_CTX *mem_ctx;
1267         struct gensec_gssapi_state *gensec_gssapi_state
1268                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1269         struct auth_serversupplied_info *server_info = NULL;
1270         struct auth_session_info *session_info = NULL;
1271         OM_uint32 maj_stat, min_stat;
1272         gss_buffer_desc pac;
1273         DATA_BLOB pac_blob;
1274
1275         if ((gensec_gssapi_state->gss_oid->length != gss_mech_krb5->length)
1276             || (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
1277                        gensec_gssapi_state->gss_oid->length) != 0)) {
1278                 DEBUG(1, ("NO session info available for this mech\n"));
1279                 return NT_STATUS_INVALID_PARAMETER;
1280         }
1281
1282         mem_ctx = talloc_named(gensec_gssapi_state, 0, "gensec_gssapi_session_info context");
1283         NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
1284
1285         maj_stat = gsskrb5_extract_authz_data_from_sec_context(&min_stat,
1286                                                                gensec_gssapi_state->gssapi_context,
1287                                                                KRB5_AUTHDATA_WIN2K_PAC,
1288                                                                &pac);
1289
1290
1291         if (maj_stat == 0) {
1292                 pac_blob = data_blob_talloc(mem_ctx, pac.value, pac.length);
1293                 gss_release_buffer(&min_stat, &pac);
1294
1295         } else {
1296                 pac_blob = data_blob(NULL, 0);
1297         }
1298
1299         /* IF we have the PAC - otherwise we need to get this
1300          * data from elsewere - local ldb, or (TODO) lookup of some
1301          * kind...
1302          */
1303         if (pac_blob.length) {
1304                 nt_status = kerberos_pac_blob_to_server_info(mem_ctx,
1305                                                              pac_blob,
1306                                                              gensec_gssapi_state->smb_krb5_context->krb5_context,
1307                                                              &server_info);
1308                 if (!NT_STATUS_IS_OK(nt_status)) {
1309                         talloc_free(mem_ctx);
1310                         return nt_status;
1311                 }
1312         } else {
1313                 gss_buffer_desc name_token;
1314                 char *principal_string;
1315
1316                 maj_stat = gss_display_name (&min_stat,
1317                                              gensec_gssapi_state->client_name,
1318                                              &name_token,
1319                                              NULL);
1320                 if (GSS_ERROR(maj_stat)) {
1321                         DEBUG(1, ("GSS display_name failed: %s\n",
1322                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1323                         talloc_free(mem_ctx);
1324                         return NT_STATUS_FOOBAR;
1325                 }
1326
1327                 principal_string = talloc_strndup(mem_ctx,
1328                                                   (const char *)name_token.value,
1329                                                   name_token.length);
1330
1331                 gss_release_buffer(&min_stat, &name_token);
1332
1333                 if (!principal_string) {
1334                         talloc_free(mem_ctx);
1335                         return NT_STATUS_NO_MEMORY;
1336                 }
1337
1338                 if (gensec_security->auth_context &&
1339                     !gensec_setting_bool(gensec_security->settings, "gensec", "require_pac", false)) {
1340                         DEBUG(1, ("Unable to find PAC, resorting to local user lookup: %s\n",
1341                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1342                         nt_status = gensec_security->auth_context->get_server_info_principal(mem_ctx,
1343                                                                                              gensec_security->auth_context,
1344                                                                                              principal_string,
1345                                                                                              NULL,
1346                                                                                              &server_info);
1347
1348                         if (!NT_STATUS_IS_OK(nt_status)) {
1349                                 talloc_free(mem_ctx);
1350                                 return nt_status;
1351                         }
1352                 } else {
1353                         DEBUG(1, ("Unable to find PAC in ticket from %s, failing to allow access: %s\n",
1354                                   principal_string,
1355                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1356                         return NT_STATUS_ACCESS_DENIED;
1357                 }
1358         }
1359
1360         /* references the server_info into the session_info */
1361         nt_status = gensec_generate_session_info(mem_ctx, gensec_security,
1362                                                  server_info, &session_info);
1363         if (!NT_STATUS_IS_OK(nt_status)) {
1364                 talloc_free(mem_ctx);
1365                 return nt_status;
1366         }
1367
1368         nt_status = gensec_gssapi_session_key(gensec_security, &session_info->session_key);
1369         if (!NT_STATUS_IS_OK(nt_status)) {
1370                 talloc_free(mem_ctx);
1371                 return nt_status;
1372         }
1373
1374         if (!(gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG)) {
1375                 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1376         } else {
1377                 krb5_error_code ret;
1378                 const char *error_string;
1379
1380                 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1381                 session_info->credentials = cli_credentials_init(session_info);
1382                 if (!session_info->credentials) {
1383                         talloc_free(mem_ctx);
1384                         return NT_STATUS_NO_MEMORY;
1385                 }
1386
1387                 cli_credentials_set_conf(session_info->credentials, gensec_security->settings->lp_ctx);
1388                 /* Just so we don't segfault trying to get at a username */
1389                 cli_credentials_set_anonymous(session_info->credentials);
1390
1391                 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1392                                                            gensec_security->settings->lp_ctx,
1393                                                            gensec_gssapi_state->delegated_cred_handle,
1394                                                            CRED_SPECIFIED, &error_string);
1395                 if (ret) {
1396                         talloc_free(mem_ctx);
1397                         DEBUG(2,("Failed to get gss creds: %s\n", error_string));
1398                         return NT_STATUS_NO_MEMORY;
1399                 }
1400
1401                 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1402                 cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
1403
1404                 /* It has been taken from this place... */
1405                 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1406         }
1407         talloc_steal(gensec_gssapi_state, session_info);
1408         talloc_free(mem_ctx);
1409         *_session_info = session_info;
1410
1411         return NT_STATUS_OK;
1412 }
1413
1414 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
1415 {
1416         struct gensec_gssapi_state *gensec_gssapi_state
1417                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1418         NTSTATUS status;
1419
1420         if (gensec_gssapi_state->sig_size) {
1421                 return gensec_gssapi_state->sig_size;
1422         }
1423
1424         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1425                 gensec_gssapi_state->sig_size = 45;
1426         } else {
1427                 gensec_gssapi_state->sig_size = 37;
1428         }
1429
1430         status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1431         if (!NT_STATUS_IS_OK(status)) {
1432                 return gensec_gssapi_state->sig_size;
1433         }
1434
1435         if (gensec_gssapi_state->lucid->protocol == 1) {
1436                 if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1437                         /*
1438                          * TODO: windows uses 76 here, but we don't know
1439                          *       gss_wrap works with aes keys yet
1440                          */
1441                         gensec_gssapi_state->sig_size = 76;
1442                 } else {
1443                         gensec_gssapi_state->sig_size = 28;
1444                 }
1445         } else if (gensec_gssapi_state->lucid->protocol == 0) {
1446                 switch (gensec_gssapi_state->lucid->rfc1964_kd.ctx_key.type) {
1447                 case KEYTYPE_DES:
1448                 case KEYTYPE_ARCFOUR:
1449                 case KEYTYPE_ARCFOUR_56:
1450                         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1451                                 gensec_gssapi_state->sig_size = 45;
1452                         } else {
1453                                 gensec_gssapi_state->sig_size = 37;
1454                         }
1455                         break;
1456                 case KEYTYPE_DES3:
1457                         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1458                                 gensec_gssapi_state->sig_size = 57;
1459                         } else {
1460                                 gensec_gssapi_state->sig_size = 49;
1461                         }
1462                         break;
1463                 }
1464         }
1465
1466         return gensec_gssapi_state->sig_size;
1467 }
1468
1469 static const char *gensec_gssapi_krb5_oids[] = {
1470         GENSEC_OID_KERBEROS5_OLD,
1471         GENSEC_OID_KERBEROS5,
1472         NULL
1473 };
1474
1475 static const char *gensec_gssapi_spnego_oids[] = {
1476         GENSEC_OID_SPNEGO,
1477         NULL
1478 };
1479
1480 /* As a server, this could in theory accept any GSSAPI mech */
1481 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1482         .name           = "gssapi_spnego",
1483         .sasl_name      = "GSS-SPNEGO",
1484         .auth_type      = DCERPC_AUTH_TYPE_SPNEGO,
1485         .oid            = gensec_gssapi_spnego_oids,
1486         .client_start   = gensec_gssapi_client_start,
1487         .server_start   = gensec_gssapi_server_start,
1488         .magic          = gensec_gssapi_magic,
1489         .update         = gensec_gssapi_update,
1490         .session_key    = gensec_gssapi_session_key,
1491         .session_info   = gensec_gssapi_session_info,
1492         .sign_packet    = gensec_gssapi_sign_packet,
1493         .check_packet   = gensec_gssapi_check_packet,
1494         .seal_packet    = gensec_gssapi_seal_packet,
1495         .unseal_packet  = gensec_gssapi_unseal_packet,
1496         .wrap           = gensec_gssapi_wrap,
1497         .unwrap         = gensec_gssapi_unwrap,
1498         .have_feature   = gensec_gssapi_have_feature,
1499         .enabled        = false,
1500         .kerberos       = true,
1501         .priority       = GENSEC_GSSAPI
1502 };
1503
1504 /* As a server, this could in theory accept any GSSAPI mech */
1505 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1506         .name           = "gssapi_krb5",
1507         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
1508         .oid            = gensec_gssapi_krb5_oids,
1509         .client_start   = gensec_gssapi_client_start,
1510         .server_start   = gensec_gssapi_server_start,
1511         .magic          = gensec_gssapi_magic,
1512         .update         = gensec_gssapi_update,
1513         .session_key    = gensec_gssapi_session_key,
1514         .session_info   = gensec_gssapi_session_info,
1515         .sig_size       = gensec_gssapi_sig_size,
1516         .sign_packet    = gensec_gssapi_sign_packet,
1517         .check_packet   = gensec_gssapi_check_packet,
1518         .seal_packet    = gensec_gssapi_seal_packet,
1519         .unseal_packet  = gensec_gssapi_unseal_packet,
1520         .wrap           = gensec_gssapi_wrap,
1521         .unwrap         = gensec_gssapi_unwrap,
1522         .have_feature   = gensec_gssapi_have_feature,
1523         .enabled        = true,
1524         .kerberos       = true,
1525         .priority       = GENSEC_GSSAPI
1526 };
1527
1528 /* As a server, this could in theory accept any GSSAPI mech */
1529 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1530         .name             = "gssapi_krb5_sasl",
1531         .sasl_name        = "GSSAPI",
1532         .client_start     = gensec_gssapi_sasl_client_start,
1533         .server_start     = gensec_gssapi_sasl_server_start,
1534         .update           = gensec_gssapi_update,
1535         .session_key      = gensec_gssapi_session_key,
1536         .session_info     = gensec_gssapi_session_info,
1537         .max_input_size   = gensec_gssapi_max_input_size,
1538         .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1539         .wrap             = gensec_gssapi_wrap,
1540         .unwrap           = gensec_gssapi_unwrap,
1541         .have_feature     = gensec_gssapi_have_feature,
1542         .enabled          = true,
1543         .kerberos         = true,
1544         .priority         = GENSEC_GSSAPI
1545 };
1546
1547 _PUBLIC_ NTSTATUS gensec_gssapi_init(void)
1548 {
1549         NTSTATUS ret;
1550
1551         ret = gensec_register(&gensec_gssapi_spnego_security_ops);
1552         if (!NT_STATUS_IS_OK(ret)) {
1553                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1554                         gensec_gssapi_spnego_security_ops.name));
1555                 return ret;
1556         }
1557
1558         ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1559         if (!NT_STATUS_IS_OK(ret)) {
1560                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1561                         gensec_gssapi_krb5_security_ops.name));
1562                 return ret;
1563         }
1564
1565         ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1566         if (!NT_STATUS_IS_OK(ret)) {
1567                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1568                         gensec_gssapi_sasl_krb5_security_ops.name));
1569                 return ret;
1570         }
1571
1572         return ret;
1573 }