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         case KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN:
 374                 DEBUG(1, ("Wrong username or password: %s\n", error_string));
 375                 return NT_STATUS_LOGON_FAILURE;
 376         case KRB5_KDC_UNREACH:
 377                 DEBUG(3, ("Cannot reach a KDC we require to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
 378                 return NT_STATUS_NO_LOGON_SERVERS;
 379         case KRB5_CC_NOTFOUND:
 380         case KRB5_CC_END:
 381                 DEBUG(2, ("Error obtaining ticket we require to contact %s: (possibly due to clock skew between us and the KDC) %s\n", gensec_gssapi_state->target_principal, error_string));
 382                 return NT_STATUS_TIME_DIFFERENCE_AT_DC;
 383         default:
 384                 DEBUG(1, ("Aquiring initiator credentials failed: %s\n", error_string));
 385                 return NT_STATUS_UNSUCCESSFUL;
 386         }
 387
 388         gensec_gssapi_state->client_cred = gcc;
 389         if (!talloc_reference(gensec_gssapi_state, gcc)) {
 390                 return NT_STATUS_NO_MEMORY;
 391         }
 392
 393         return NT_STATUS_OK;
 394 }
 395
 396 static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
 397 {
 398         NTSTATUS nt_status;
 399         struct gensec_gssapi_state *gensec_gssapi_state;
 400         nt_status = gensec_gssapi_client_start(gensec_security);
 401
 402         if (NT_STATUS_IS_OK(nt_status)) {
 403                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 404                 gensec_gssapi_state->sasl = true;
 405         }
 406         return nt_status;
 407 }
 408
 409
 410 /**
 411  * Check if the packet is one for this mechansim
 412  *
 413  * @param gensec_security GENSEC state
 414  * @param in The request, as a DATA_BLOB
 415  * @return Error, INVALID_PARAMETER if it's not a packet for us
 416  *                or NT_STATUS_OK if the packet is ok.
 417  */
 418
 419 static NTSTATUS gensec_gssapi_magic(struct gensec_security *gensec_security,
 420                                     const DATA_BLOB *in)
 421 {
 422         if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
 423                 return NT_STATUS_OK;
 424         } else {
 425                 return NT_STATUS_INVALID_PARAMETER;
 426         }
 427 }
 428
 429
 430 /**
 431  * Next state function for the GSSAPI GENSEC mechanism
 432  *
 433  * @param gensec_gssapi_state GSSAPI State
 434  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 435  * @param in The request, as a DATA_BLOB
 436  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 437  * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
 438  *                or NT_STATUS_OK if the user is authenticated.
 439  */
 440
 441 static NTSTATUS gensec_gssapi_update(struct gensec_security *gensec_security,
 442                                    TALLOC_CTX *out_mem_ctx,
 443                                    const DATA_BLOB in, DATA_BLOB *out)
 444 {
 445         struct gensec_gssapi_state *gensec_gssapi_state
 446                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 447         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 448         OM_uint32 maj_stat, min_stat;
 449         OM_uint32 min_stat2;
 450         gss_buffer_desc input_token, output_token;
 451         gss_OID gss_oid_p = NULL;
 452         input_token.length = in.length;
 453         input_token.value = in.data;
 454
 455         switch (gensec_gssapi_state->sasl_state) {
 456         case STAGE_GSS_NEG:
 457         {
 458                 switch (gensec_security->gensec_role) {
 459                 case GENSEC_CLIENT:
 460                 {
 461                         struct gsskrb5_send_to_kdc send_to_kdc;
 462                         krb5_error_code ret;
 463                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 464                         send_to_kdc.ptr = gensec_security->event_ctx;
 465
 466                         min_stat = gsskrb5_set_send_to_kdc(&send_to_kdc);
 467                         if (min_stat) {
 468                                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
 469                                 return NT_STATUS_INTERNAL_ERROR;
 470                         }
 471
 472                         maj_stat = gss_init_sec_context(&min_stat,
 473                                                         gensec_gssapi_state->client_cred->creds,
 474                                                         &gensec_gssapi_state->gssapi_context,
 475                                                         gensec_gssapi_state->server_name,
 476                                                         gensec_gssapi_state->gss_oid,
 477                                                         gensec_gssapi_state->want_flags,
 478                                                         0,
 479                                                         gensec_gssapi_state->input_chan_bindings,
 480                                                         &input_token,
 481                                                         &gss_oid_p,
 482                                                         &output_token,
 483                                                         &gensec_gssapi_state->got_flags, /* ret flags */
 484                                                         NULL);
 485                         if (gss_oid_p) {
 486                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 487                         }
 488
 489                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 490                         send_to_kdc.ptr = NULL;
 491
 492                         ret = gsskrb5_set_send_to_kdc(&send_to_kdc);
 493                         if (ret) {
 494                                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
 495                                 return NT_STATUS_INTERNAL_ERROR;
 496                         }
 497
 498                         break;
 499                 }
 500                 case GENSEC_SERVER:
 501                 {
 502                         maj_stat = gss_accept_sec_context(&min_stat,
 503                                                           &gensec_gssapi_state->gssapi_context,
 504                                                           gensec_gssapi_state->server_cred->creds,
 505                                                           &input_token,
 506                                                           gensec_gssapi_state->input_chan_bindings,
 507                                                           &gensec_gssapi_state->client_name,
 508                                                           &gss_oid_p,
 509                                                           &output_token,
 510                                                           &gensec_gssapi_state->got_flags,
 511                                                           NULL,
 512                                                           &gensec_gssapi_state->delegated_cred_handle);
 513                         if (gss_oid_p) {
 514                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 515                         }
 516                         break;
 517                 }
 518                 default:
 519                         return NT_STATUS_INVALID_PARAMETER;
 520
 521                 }
 522
 523                 gensec_gssapi_state->gss_exchange_count++;
 524
 525                 if (maj_stat == GSS_S_COMPLETE) {
 526                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 527                         gss_release_buffer(&min_stat2, &output_token);
 528
 529                         if (gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG) {
 530                                 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
 531                         } else {
 532                                 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
 533                         }
 534
 535                         /* We may have been invoked as SASL, so there
 536                          * is more work to do */
 537                         if (gensec_gssapi_state->sasl) {
 538                                 /* Due to a very subtle interaction
 539                                  * with SASL and the LDAP libs, we
 540                                  * must ensure the data pointer is
 541                                  * != NULL, but the length is 0.
 542                                  *
 543                                  * This ensures we send a 'zero
 544                                  * length' (rather than NULL) response
 545                                  */
 546
 547                                 if (!out->data) {
 548                                         out->data = (uint8_t *)talloc_strdup(out_mem_ctx, "\0");
 549                                 }
 550
 551                                 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
 552                                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 553                         } else {
 554                                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 555
 556                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 557                                         DEBUG(5, ("GSSAPI Connection will be cryptographically sealed\n"));
 558                                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 559                                         DEBUG(5, ("GSSAPI Connection will be cryptographically signed\n"));
 560                                 } else {
 561                                         DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
 562                                 }
 563
 564                                 return NT_STATUS_OK;
 565                         }
 566                 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
 567                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 568                         gss_release_buffer(&min_stat2, &output_token);
 569
 570                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 571                 } else if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
 572                         switch (min_stat) {
 573                         case KRB5KRB_AP_ERR_TKT_NYV:
 574                                 DEBUG(1, ("Error with ticket to contact %s: possible clock skew between us and the KDC or target server: %s\n",
 575                                           gensec_gssapi_state->target_principal,
 576                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 577                                 return NT_STATUS_TIME_DIFFERENCE_AT_DC; /* Make SPNEGO ignore us, we can't go any further here */
 578                         case KRB5KRB_AP_ERR_TKT_EXPIRED:
 579                                 DEBUG(1, ("Error with ticket to contact %s: ticket is expired, possible clock skew between us and the KDC or target server: %s\n",
 580                                           gensec_gssapi_state->target_principal,
 581                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 582                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 583                         case KRB5_KDC_UNREACH:
 584                                 DEBUG(3, ("Cannot reach a KDC we require in order to obtain a ticetk to %s: %s\n",
 585                                           gensec_gssapi_state->target_principal,
 586                                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 587                                 return NT_STATUS_NO_LOGON_SERVERS; /* Make SPNEGO ignore us, we can't go any further here */
 588                         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 589                                 DEBUG(3, ("Server %s is not registered with our KDC: %s\n",
 590                                           gensec_gssapi_state->target_principal,
 591                                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 592                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 593                         case KRB5KRB_AP_ERR_MSG_TYPE:
 594                                 /* garbage input, possibly from the auto-mech detection */
 595                                 return NT_STATUS_INVALID_PARAMETER;
 596                         default:
 597                                 DEBUG(1, ("GSS Update(krb5)(%d) Update failed: %s\n",
 598                                           gensec_gssapi_state->gss_exchange_count,
 599                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 600                                 return nt_status;
 601                         }
 602                 } else {
 603                         DEBUG(1, ("GSS Update(%d) failed: %s\n",
 604                                   gensec_gssapi_state->gss_exchange_count,
 605                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 606                         return nt_status;
 607                 }
 608                 break;
 609         }
 610
 611         /* These last two stages are only done if we were invoked as SASL */
 612         case STAGE_SASL_SSF_NEG:
 613         {
 614                 switch (gensec_security->gensec_role) {
 615                 case GENSEC_CLIENT:
 616                 {
 617                         uint8_t maxlength_proposed[4];
 618                         uint8_t maxlength_accepted[4];
 619                         uint8_t security_supported;
 620                         int conf_state;
 621                         gss_qop_t qop_state;
 622                         input_token.length = in.length;
 623                         input_token.value = in.data;
 624
 625                         /* As a client, we have just send a
 626                          * zero-length blob to the server (after the
 627                          * normal GSSAPI exchange), and it has replied
 628                          * with it's SASL negotiation */
 629
 630                         maj_stat = gss_unwrap(&min_stat,
 631                                               gensec_gssapi_state->gssapi_context,
 632                                               &input_token,
 633                                               &output_token,
 634                                               &conf_state,
 635                                               &qop_state);
 636                         if (GSS_ERROR(maj_stat)) {
 637                                 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 638                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 639                                 return NT_STATUS_ACCESS_DENIED;
 640                         }
 641
 642                         if (output_token.length < 4) {
 643                                 return NT_STATUS_INVALID_PARAMETER;
 644                         }
 645
 646                         memcpy(maxlength_proposed, output_token.value, 4);
 647                         gss_release_buffer(&min_stat, &output_token);
 648
 649                         /* first byte is the proposed security */
 650                         security_supported = maxlength_proposed[0];
 651                         maxlength_proposed[0] = '\0';
 652
 653                         /* Rest is the proposed max wrap length */
 654                         gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
 655                                                                      gensec_gssapi_state->max_wrap_buf_size);
 656                         gensec_gssapi_state->sasl_protection = 0;
 657                         if (security_supported & NEG_SEAL) {
 658                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 659                                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 660                                 }
 661                         }
 662                         if (security_supported & NEG_SIGN) {
 663                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 664                                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 665                                 }
 666                         }
 667                         if (security_supported & NEG_NONE) {
 668                                 gensec_gssapi_state->sasl_protection |= NEG_NONE;
 669                         }
 670                         if (gensec_gssapi_state->sasl_protection == 0) {
 671                                 DEBUG(1, ("Remote server does not support unprotected connections\n"));
 672                                 return NT_STATUS_ACCESS_DENIED;
 673                         }
 674
 675                         /* Send back the negotiated max length */
 676
 677                         RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
 678
 679                         maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
 680
 681                         input_token.value = maxlength_accepted;
 682                         input_token.length = sizeof(maxlength_accepted);
 683
 684                         maj_stat = gss_wrap(&min_stat,
 685                                             gensec_gssapi_state->gssapi_context,
 686                                             false,
 687                                             GSS_C_QOP_DEFAULT,
 688                                             &input_token,
 689                                             &conf_state,
 690                                             &output_token);
 691                         if (GSS_ERROR(maj_stat)) {
 692                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 693                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 694                                 return NT_STATUS_ACCESS_DENIED;
 695                         }
 696
 697                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 698                         gss_release_buffer(&min_stat, &output_token);
 699
 700                         /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 701                         gensec_gssapi_state->sasl_state = STAGE_DONE;
 702
 703                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 704                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically sealed\n"));
 705                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 706                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically signed\n"));
 707                         } else {
 708                                 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographically protection\n"));
 709                         }
 710
 711                         return NT_STATUS_OK;
 712                 }
 713                 case GENSEC_SERVER:
 714                 {
 715                         uint8_t maxlength_proposed[4];
 716                         uint8_t security_supported = 0x0;
 717                         int conf_state;
 718
 719                         /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
 720                         if (in.length != 0) {
 721                                 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
 722                         }
 723
 724                         /* Give the client some idea what we will support */
 725
 726                         RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
 727                         /* first byte is the proposed security */
 728                         maxlength_proposed[0] = '\0';
 729
 730                         gensec_gssapi_state->sasl_protection = 0;
 731                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 732                                 security_supported |= NEG_SEAL;
 733                         }
 734                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 735                                 security_supported |= NEG_SIGN;
 736                         }
 737                         if (security_supported == 0) {
 738                                 /* If we don't support anything, this must be 0 */
 739                                 RSIVAL(maxlength_proposed, 0, 0x0);
 740                         }
 741
 742                         /* TODO:  We may not wish to support this */
 743                         security_supported |= NEG_NONE;
 744                         maxlength_proposed[0] = security_supported;
 745
 746                         input_token.value = maxlength_proposed;
 747                         input_token.length = sizeof(maxlength_proposed);
 748
 749                         maj_stat = gss_wrap(&min_stat,
 750                                             gensec_gssapi_state->gssapi_context,
 751                                             false,
 752                                             GSS_C_QOP_DEFAULT,
 753                                             &input_token,
 754                                             &conf_state,
 755                                             &output_token);
 756                         if (GSS_ERROR(maj_stat)) {
 757                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 758                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 759                                 return NT_STATUS_ACCESS_DENIED;
 760                         }
 761
 762                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 763                         gss_release_buffer(&min_stat, &output_token);
 764
 765                         gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
 766                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 767                 }
 768                 default:
 769                         return NT_STATUS_INVALID_PARAMETER;
 770
 771                 }
 772         }
 773         /* This is s server-only stage */
 774         case STAGE_SASL_SSF_ACCEPT:
 775         {
 776                 uint8_t maxlength_accepted[4];
 777                 uint8_t security_accepted;
 778                 int conf_state;
 779                 gss_qop_t qop_state;
 780                 input_token.length = in.length;
 781                 input_token.value = in.data;
 782
 783                 maj_stat = gss_unwrap(&min_stat,
 784                                       gensec_gssapi_state->gssapi_context,
 785                                       &input_token,
 786                                       &output_token,
 787                                       &conf_state,
 788                                       &qop_state);
 789                 if (GSS_ERROR(maj_stat)) {
 790                         DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 791                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 792                         return NT_STATUS_ACCESS_DENIED;
 793                 }
 794
 795                 if (output_token.length < 4) {
 796                         return NT_STATUS_INVALID_PARAMETER;
 797                 }
 798
 799                 memcpy(maxlength_accepted, output_token.value, 4);
 800                 gss_release_buffer(&min_stat, &output_token);
 801
 802                 /* first byte is the proposed security */
 803                 security_accepted = maxlength_accepted[0];
 804                 maxlength_accepted[0] = '\0';
 805
 806                 /* Rest is the proposed max wrap length */
 807                 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
 808                                                              gensec_gssapi_state->max_wrap_buf_size);
 809
 810                 gensec_gssapi_state->sasl_protection = 0;
 811                 if (security_accepted & NEG_SEAL) {
 812                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 813                                 DEBUG(1, ("Remote client wanted seal, but gensec refused\n"));
 814                                 return NT_STATUS_ACCESS_DENIED;
 815                         }
 816                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 817                 }
 818                 if (security_accepted & NEG_SIGN) {
 819                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 820                                 DEBUG(1, ("Remote client wanted sign, but gensec refused\n"));
 821                                 return NT_STATUS_ACCESS_DENIED;
 822                         }
 823                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 824                 }
 825                 if (security_accepted & NEG_NONE) {
 826                         gensec_gssapi_state->sasl_protection |= NEG_NONE;
 827                 }
 828
 829                 /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 830                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 831                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 832                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically sealed\n"));
 833                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 834                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically signed\n"));
 835                 } else {
 836                         DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
 837                 }
 838
 839                 *out = data_blob(NULL, 0);
 840                 return NT_STATUS_OK;
 841         }
 842         default:
 843                 return NT_STATUS_INVALID_PARAMETER;
 844         }
 845 }
 846
 847 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
 848                                    TALLOC_CTX *mem_ctx,
 849                                    const DATA_BLOB *in,
 850                                    DATA_BLOB *out)
 851 {
 852         struct gensec_gssapi_state *gensec_gssapi_state
 853                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 854         OM_uint32 maj_stat, min_stat;
 855         gss_buffer_desc input_token, output_token;
 856         int conf_state;
 857         input_token.length = in->length;
 858         input_token.value = in->data;
 859
 860         maj_stat = gss_wrap(&min_stat,
 861                             gensec_gssapi_state->gssapi_context,
 862                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 863                             GSS_C_QOP_DEFAULT,
 864                             &input_token,
 865                             &conf_state,
 866                             &output_token);
 867         if (GSS_ERROR(maj_stat)) {
 868                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 869                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 870                 return NT_STATUS_ACCESS_DENIED;
 871         }
 872
 873         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 874         gss_release_buffer(&min_stat, &output_token);
 875
 876         if (gensec_gssapi_state->sasl) {
 877                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 878                 if (max_wrapped_size < out->length) {
 879                         DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
 880                                   (unsigned)in->length,
 881                                   (unsigned)out->length,
 882                                   (unsigned int)max_wrapped_size));
 883                         return NT_STATUS_INVALID_PARAMETER;
 884                 }
 885         }
 886
 887         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 888             && !conf_state) {
 889                 return NT_STATUS_ACCESS_DENIED;
 890         }
 891         return NT_STATUS_OK;
 892 }
 893
 894 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
 895                                      TALLOC_CTX *mem_ctx,
 896                                      const DATA_BLOB *in,
 897                                      DATA_BLOB *out)
 898 {
 899         struct gensec_gssapi_state *gensec_gssapi_state
 900                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 901         OM_uint32 maj_stat, min_stat;
 902         gss_buffer_desc input_token, output_token;
 903         int conf_state;
 904         gss_qop_t qop_state;
 905         input_token.length = in->length;
 906         input_token.value = in->data;
 907
 908         if (gensec_gssapi_state->sasl) {
 909                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 910                 if (max_wrapped_size < in->length) {
 911                         DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
 912                         return NT_STATUS_INVALID_PARAMETER;
 913                 }
 914         }
 915
 916         maj_stat = gss_unwrap(&min_stat,
 917                               gensec_gssapi_state->gssapi_context,
 918                               &input_token,
 919                               &output_token,
 920                               &conf_state,
 921                               &qop_state);
 922         if (GSS_ERROR(maj_stat)) {
 923                 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
 924                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 925                 return NT_STATUS_ACCESS_DENIED;
 926         }
 927
 928         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 929         gss_release_buffer(&min_stat, &output_token);
 930
 931         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 932             && !conf_state) {
 933                 return NT_STATUS_ACCESS_DENIED;
 934         }
 935         return NT_STATUS_OK;
 936 }
 937
 938 /* Find out the maximum input size negotiated on this connection */
 939
 940 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
 941 {
 942         struct gensec_gssapi_state *gensec_gssapi_state
 943                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 944         OM_uint32 maj_stat, min_stat;
 945         OM_uint32 max_input_size;
 946
 947         maj_stat = gss_wrap_size_limit(&min_stat,
 948                                        gensec_gssapi_state->gssapi_context,
 949                                        gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 950                                        GSS_C_QOP_DEFAULT,
 951                                        gensec_gssapi_state->max_wrap_buf_size,
 952                                        &max_input_size);
 953         if (GSS_ERROR(maj_stat)) {
 954                 TALLOC_CTX *mem_ctx = talloc_new(NULL);
 955                 DEBUG(1, ("gensec_gssapi_max_input_size: determinaing signature size with gss_wrap_size_limit failed: %s\n",
 956                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 957                 talloc_free(mem_ctx);
 958                 return 0;
 959         }
 960
 961         return max_input_size;
 962 }
 963
 964 /* Find out the maximum output size negotiated on this connection */
 965 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
 966 {
 967         struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
 968         return gensec_gssapi_state->max_wrap_buf_size;
 969 }
 970
 971 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
 972                                           TALLOC_CTX *mem_ctx,
 973                                           uint8_t *data, size_t length,
 974                                           const uint8_t *whole_pdu, size_t pdu_length,
 975                                           DATA_BLOB *sig)
 976 {
 977         struct gensec_gssapi_state *gensec_gssapi_state
 978                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 979         OM_uint32 maj_stat, min_stat;
 980         gss_buffer_desc input_token, output_token;
 981         int conf_state;
 982         ssize_t sig_length;
 983
 984         input_token.length = length;
 985         input_token.value = data;
 986
 987         maj_stat = gss_wrap(&min_stat,
 988                             gensec_gssapi_state->gssapi_context,
 989                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 990                             GSS_C_QOP_DEFAULT,
 991                             &input_token,
 992                             &conf_state,
 993                             &output_token);
 994         if (GSS_ERROR(maj_stat)) {
 995                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
 996                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 997                 return NT_STATUS_ACCESS_DENIED;
 998         }
 999
1000         if (output_token.length < input_token.length) {
1001                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
1002                           (long)output_token.length, (long)length));
1003                 return NT_STATUS_INTERNAL_ERROR;
1004         }
1005         sig_length = output_token.length - input_token.length;
1006
1007         memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
1008         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
1009
1010         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1011         dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
1012         dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
1013
1014         gss_release_buffer(&min_stat, &output_token);
1015
1016         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1017             && !conf_state) {
1018                 return NT_STATUS_ACCESS_DENIED;
1019         }
1020         return NT_STATUS_OK;
1021 }
1022
1023 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
1024                                             TALLOC_CTX *mem_ctx,
1025                                             uint8_t *data, size_t length,
1026                                             const uint8_t *whole_pdu, size_t pdu_length,
1027                                             const DATA_BLOB *sig)
1028 {
1029         struct gensec_gssapi_state *gensec_gssapi_state
1030                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1031         OM_uint32 maj_stat, min_stat;
1032         gss_buffer_desc input_token, output_token;
1033         int conf_state;
1034         gss_qop_t qop_state;
1035         DATA_BLOB in;
1036
1037         dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
1038
1039         in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
1040
1041         memcpy(in.data, sig->data, sig->length);
1042         memcpy(in.data + sig->length, data, length);
1043
1044         input_token.length = in.length;
1045         input_token.value = in.data;
1046
1047         maj_stat = gss_unwrap(&min_stat,
1048                               gensec_gssapi_state->gssapi_context,
1049                               &input_token,
1050                               &output_token,
1051                               &conf_state,
1052                               &qop_state);
1053         if (GSS_ERROR(maj_stat)) {
1054                 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
1055                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1056                 return NT_STATUS_ACCESS_DENIED;
1057         }
1058
1059         if (output_token.length != length) {
1060                 return NT_STATUS_INTERNAL_ERROR;
1061         }
1062
1063         memcpy(data, output_token.value, length);
1064
1065         gss_release_buffer(&min_stat, &output_token);
1066
1067         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1068             && !conf_state) {
1069                 return NT_STATUS_ACCESS_DENIED;
1070         }
1071         return NT_STATUS_OK;
1072 }
1073
1074 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1075                                           TALLOC_CTX *mem_ctx,
1076                                           const uint8_t *data, size_t length,
1077                                           const uint8_t *whole_pdu, size_t pdu_length,
1078                                           DATA_BLOB *sig)
1079 {
1080         struct gensec_gssapi_state *gensec_gssapi_state
1081                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1082         OM_uint32 maj_stat, min_stat;
1083         gss_buffer_desc input_token, output_token;
1084
1085         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1086                 input_token.length = pdu_length;
1087                 input_token.value = discard_const_p(uint8_t *, whole_pdu);
1088         } else {
1089                 input_token.length = length;
1090                 input_token.value = discard_const_p(uint8_t *, data);
1091         }
1092
1093         maj_stat = gss_get_mic(&min_stat,
1094                             gensec_gssapi_state->gssapi_context,
1095                             GSS_C_QOP_DEFAULT,
1096                             &input_token,
1097                             &output_token);
1098         if (GSS_ERROR(maj_stat)) {
1099                 DEBUG(1, ("GSS GetMic failed: %s\n",
1100                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1101                 return NT_STATUS_ACCESS_DENIED;
1102         }
1103
1104         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, output_token.length);
1105
1106         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1107
1108         gss_release_buffer(&min_stat, &output_token);
1109
1110         return NT_STATUS_OK;
1111 }
1112
1113 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1114                                            TALLOC_CTX *mem_ctx,
1115                                            const uint8_t *data, size_t length,
1116                                            const uint8_t *whole_pdu, size_t pdu_length,
1117                                            const DATA_BLOB *sig)
1118 {
1119         struct gensec_gssapi_state *gensec_gssapi_state
1120                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1121         OM_uint32 maj_stat, min_stat;
1122         gss_buffer_desc input_token;
1123         gss_buffer_desc input_message;
1124         gss_qop_t qop_state;
1125
1126         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1127
1128         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1129                 input_message.length = pdu_length;
1130                 input_message.value = discard_const(whole_pdu);
1131         } else {
1132                 input_message.length = length;
1133                 input_message.value = discard_const(data);
1134         }
1135
1136         input_token.length = sig->length;
1137         input_token.value = sig->data;
1138
1139         maj_stat = gss_verify_mic(&min_stat,
1140                               gensec_gssapi_state->gssapi_context,
1141                               &input_message,
1142                               &input_token,
1143                               &qop_state);
1144         if (GSS_ERROR(maj_stat)) {
1145                 DEBUG(1, ("GSS VerifyMic failed: %s\n",
1146                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1147                 return NT_STATUS_ACCESS_DENIED;
1148         }
1149
1150         return NT_STATUS_OK;
1151 }
1152
1153 /* Try to figure out what features we actually got on the connection */
1154 static bool gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1155                                        uint32_t feature)
1156 {
1157         struct gensec_gssapi_state *gensec_gssapi_state
1158                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1159         if (feature & GENSEC_FEATURE_SIGN) {
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_SIGN)
1164                                 && (gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG));
1165                 }
1166                 return gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG;
1167         }
1168         if (feature & GENSEC_FEATURE_SEAL) {
1169                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1170                 if (gensec_gssapi_state->sasl
1171                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1172                         return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1173                                  && (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG));
1174                 }
1175                 return gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG;
1176         }
1177         if (feature & GENSEC_FEATURE_SESSION_KEY) {
1178                 /* Only for GSSAPI/Krb5 */
1179                 if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
1180                         return true;
1181                 }
1182         }
1183         if (feature & GENSEC_FEATURE_DCE_STYLE) {
1184                 return gensec_gssapi_state->got_flags & GSS_C_DCE_STYLE;
1185         }
1186         if (feature & GENSEC_FEATURE_NEW_SPNEGO) {
1187                 NTSTATUS status;
1188
1189                 if (!(gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG)) {
1190                         return false;
1191                 }
1192
1193                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "force_new_spnego", false)) {
1194                         return true;
1195                 }
1196                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "disable_new_spnego", false)) {
1197                         return false;
1198                 }
1199
1200                 status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1201                 if (!NT_STATUS_IS_OK(status)) {
1202                         return false;
1203                 }
1204
1205                 if (gensec_gssapi_state->lucid->protocol == 1) {
1206                         return true;
1207                 }
1208
1209                 return false;
1210         }
1211         /* We can always do async (rather than strict request/reply) packets.  */
1212         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1213                 return true;
1214         }
1215         return false;
1216 }
1217
1218 /*
1219  * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1220  * (for encrypting some passwords).
1221  *
1222  * This breaks all the abstractions, but what do you expect...
1223  */
1224 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1225                                           DATA_BLOB *session_key)
1226 {
1227         struct gensec_gssapi_state *gensec_gssapi_state
1228                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1229         OM_uint32 maj_stat, min_stat;
1230         krb5_keyblock *subkey;
1231
1232         if (gensec_gssapi_state->sasl_state != STAGE_DONE) {
1233                 return NT_STATUS_NO_USER_SESSION_KEY;
1234         }
1235
1236         if (gensec_gssapi_state->session_key.data) {
1237                 *session_key = gensec_gssapi_state->session_key;
1238                 return NT_STATUS_OK;
1239         }
1240
1241         maj_stat = gsskrb5_get_subkey(&min_stat,
1242                                       gensec_gssapi_state->gssapi_context,
1243                                       &subkey);
1244         if (maj_stat != 0) {
1245                 DEBUG(1, ("NO session key for this mech\n"));
1246                 return NT_STATUS_NO_USER_SESSION_KEY;
1247         }
1248
1249         DEBUG(10, ("Got KRB5 session key of length %d%s\n",
1250                    (int)KRB5_KEY_LENGTH(subkey),
1251                    (gensec_gssapi_state->sasl_state == STAGE_DONE)?" (done)":""));
1252         *session_key = data_blob_talloc(gensec_gssapi_state,
1253                                         KRB5_KEY_DATA(subkey), KRB5_KEY_LENGTH(subkey));
1254         krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context, subkey);
1255         gensec_gssapi_state->session_key = *session_key;
1256         dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
1257
1258         return NT_STATUS_OK;
1259 }
1260
1261 /* Get some basic (and authorization) information about the user on
1262  * this session.  This uses either the PAC (if present) or a local
1263  * database lookup */
1264 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1265                                            struct auth_session_info **_session_info)
1266 {
1267         NTSTATUS nt_status;
1268         TALLOC_CTX *mem_ctx;
1269         struct gensec_gssapi_state *gensec_gssapi_state
1270                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1271         struct auth_serversupplied_info *server_info = NULL;
1272         struct auth_session_info *session_info = NULL;
1273         OM_uint32 maj_stat, min_stat;
1274         gss_buffer_desc pac;
1275         DATA_BLOB pac_blob;
1276
1277         if ((gensec_gssapi_state->gss_oid->length != gss_mech_krb5->length)
1278             || (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
1279                        gensec_gssapi_state->gss_oid->length) != 0)) {
1280                 DEBUG(1, ("NO session info available for this mech\n"));
1281                 return NT_STATUS_INVALID_PARAMETER;
1282         }
1283
1284         mem_ctx = talloc_named(gensec_gssapi_state, 0, "gensec_gssapi_session_info context");
1285         NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
1286
1287         maj_stat = gsskrb5_extract_authz_data_from_sec_context(&min_stat,
1288                                                                gensec_gssapi_state->gssapi_context,
1289                                                                KRB5_AUTHDATA_WIN2K_PAC,
1290                                                                &pac);
1291
1292
1293         if (maj_stat == 0) {
1294                 pac_blob = data_blob_talloc(mem_ctx, pac.value, pac.length);
1295                 gss_release_buffer(&min_stat, &pac);
1296
1297         } else {
1298                 pac_blob = data_blob(NULL, 0);
1299         }
1300
1301         /* IF we have the PAC - otherwise we need to get this
1302          * data from elsewere - local ldb, or (TODO) lookup of some
1303          * kind...
1304          */
1305         if (pac_blob.length) {
1306                 nt_status = kerberos_pac_blob_to_server_info(mem_ctx,
1307                                                              pac_blob,
1308                                                              gensec_gssapi_state->smb_krb5_context->krb5_context,
1309                                                              &server_info);
1310                 if (!NT_STATUS_IS_OK(nt_status)) {
1311                         talloc_free(mem_ctx);
1312                         return nt_status;
1313                 }
1314         } else {
1315                 gss_buffer_desc name_token;
1316                 char *principal_string;
1317
1318                 maj_stat = gss_display_name (&min_stat,
1319                                              gensec_gssapi_state->client_name,
1320                                              &name_token,
1321                                              NULL);
1322                 if (GSS_ERROR(maj_stat)) {
1323                         DEBUG(1, ("GSS display_name failed: %s\n",
1324                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1325                         talloc_free(mem_ctx);
1326                         return NT_STATUS_FOOBAR;
1327                 }
1328
1329                 principal_string = talloc_strndup(mem_ctx,
1330                                                   (const char *)name_token.value,
1331                                                   name_token.length);
1332
1333                 gss_release_buffer(&min_stat, &name_token);
1334
1335                 if (!principal_string) {
1336                         talloc_free(mem_ctx);
1337                         return NT_STATUS_NO_MEMORY;
1338                 }
1339
1340                 if (gensec_security->auth_context &&
1341                     !gensec_setting_bool(gensec_security->settings, "gensec", "require_pac", false)) {
1342                         DEBUG(1, ("Unable to find PAC, resorting to local user lookup: %s\n",
1343                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1344                         nt_status = gensec_security->auth_context->get_server_info_principal(mem_ctx,
1345                                                                                              gensec_security->auth_context,
1346                                                                                              principal_string,
1347                                                                                              NULL,
1348                                                                                              &server_info);
1349
1350                         if (!NT_STATUS_IS_OK(nt_status)) {
1351                                 talloc_free(mem_ctx);
1352                                 return nt_status;
1353                         }
1354                 } else {
1355                         DEBUG(1, ("Unable to find PAC in ticket from %s, failing to allow access: %s\n",
1356                                   principal_string,
1357                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1358                         return NT_STATUS_ACCESS_DENIED;
1359                 }
1360         }
1361
1362         /* references the server_info into the session_info */
1363         nt_status = gensec_generate_session_info(mem_ctx, gensec_security,
1364                                                  server_info, &session_info);
1365         if (!NT_STATUS_IS_OK(nt_status)) {
1366                 talloc_free(mem_ctx);
1367                 return nt_status;
1368         }
1369
1370         nt_status = gensec_gssapi_session_key(gensec_security, &session_info->session_key);
1371         if (!NT_STATUS_IS_OK(nt_status)) {
1372                 talloc_free(mem_ctx);
1373                 return nt_status;
1374         }
1375
1376         if (!(gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG)) {
1377                 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1378         } else {
1379                 krb5_error_code ret;
1380                 const char *error_string;
1381
1382                 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1383                 session_info->credentials = cli_credentials_init(session_info);
1384                 if (!session_info->credentials) {
1385                         talloc_free(mem_ctx);
1386                         return NT_STATUS_NO_MEMORY;
1387                 }
1388
1389                 cli_credentials_set_conf(session_info->credentials, gensec_security->settings->lp_ctx);
1390                 /* Just so we don't segfault trying to get at a username */
1391                 cli_credentials_set_anonymous(session_info->credentials);
1392
1393                 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1394                                                            gensec_security->settings->lp_ctx,
1395                                                            gensec_gssapi_state->delegated_cred_handle,
1396                                                            CRED_SPECIFIED, &error_string);
1397                 if (ret) {
1398                         talloc_free(mem_ctx);
1399                         DEBUG(2,("Failed to get gss creds: %s\n", error_string));
1400                         return NT_STATUS_NO_MEMORY;
1401                 }
1402
1403                 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1404                 cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
1405
1406                 /* It has been taken from this place... */
1407                 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1408         }
1409         talloc_steal(gensec_gssapi_state, session_info);
1410         talloc_free(mem_ctx);
1411         *_session_info = session_info;
1412
1413         return NT_STATUS_OK;
1414 }
1415
1416 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
1417 {
1418         struct gensec_gssapi_state *gensec_gssapi_state
1419                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1420         NTSTATUS status;
1421
1422         if (gensec_gssapi_state->sig_size) {
1423                 return gensec_gssapi_state->sig_size;
1424         }
1425
1426         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1427                 gensec_gssapi_state->sig_size = 45;
1428         } else {
1429                 gensec_gssapi_state->sig_size = 37;
1430         }
1431
1432         status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1433         if (!NT_STATUS_IS_OK(status)) {
1434                 return gensec_gssapi_state->sig_size;
1435         }
1436
1437         if (gensec_gssapi_state->lucid->protocol == 1) {
1438                 if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1439                         /*
1440                          * TODO: windows uses 76 here, but we don't know
1441                          *       gss_wrap works with aes keys yet
1442                          */
1443                         gensec_gssapi_state->sig_size = 76;
1444                 } else {
1445                         gensec_gssapi_state->sig_size = 28;
1446                 }
1447         } else if (gensec_gssapi_state->lucid->protocol == 0) {
1448                 switch (gensec_gssapi_state->lucid->rfc1964_kd.ctx_key.type) {
1449                 case KEYTYPE_DES:
1450                 case KEYTYPE_ARCFOUR:
1451                 case KEYTYPE_ARCFOUR_56:
1452                         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1453                                 gensec_gssapi_state->sig_size = 45;
1454                         } else {
1455                                 gensec_gssapi_state->sig_size = 37;
1456                         }
1457                         break;
1458                 case KEYTYPE_DES3:
1459                         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1460                                 gensec_gssapi_state->sig_size = 57;
1461                         } else {
1462                                 gensec_gssapi_state->sig_size = 49;
1463                         }
1464                         break;
1465                 }
1466         }
1467
1468         return gensec_gssapi_state->sig_size;
1469 }
1470
1471 static const char *gensec_gssapi_krb5_oids[] = {
1472         GENSEC_OID_KERBEROS5_OLD,
1473         GENSEC_OID_KERBEROS5,
1474         NULL
1475 };
1476
1477 static const char *gensec_gssapi_spnego_oids[] = {
1478         GENSEC_OID_SPNEGO,
1479         NULL
1480 };
1481
1482 /* As a server, this could in theory accept any GSSAPI mech */
1483 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1484         .name           = "gssapi_spnego",
1485         .sasl_name      = "GSS-SPNEGO",
1486         .auth_type      = DCERPC_AUTH_TYPE_SPNEGO,
1487         .oid            = gensec_gssapi_spnego_oids,
1488         .client_start   = gensec_gssapi_client_start,
1489         .server_start   = gensec_gssapi_server_start,
1490         .magic          = gensec_gssapi_magic,
1491         .update         = gensec_gssapi_update,
1492         .session_key    = gensec_gssapi_session_key,
1493         .session_info   = gensec_gssapi_session_info,
1494         .sign_packet    = gensec_gssapi_sign_packet,
1495         .check_packet   = gensec_gssapi_check_packet,
1496         .seal_packet    = gensec_gssapi_seal_packet,
1497         .unseal_packet  = gensec_gssapi_unseal_packet,
1498         .wrap           = gensec_gssapi_wrap,
1499         .unwrap         = gensec_gssapi_unwrap,
1500         .have_feature   = gensec_gssapi_have_feature,
1501         .enabled        = false,
1502         .kerberos       = true,
1503         .priority       = GENSEC_GSSAPI
1504 };
1505
1506 /* As a server, this could in theory accept any GSSAPI mech */
1507 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1508         .name           = "gssapi_krb5",
1509         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
1510         .oid            = gensec_gssapi_krb5_oids,
1511         .client_start   = gensec_gssapi_client_start,
1512         .server_start   = gensec_gssapi_server_start,
1513         .magic          = gensec_gssapi_magic,
1514         .update         = gensec_gssapi_update,
1515         .session_key    = gensec_gssapi_session_key,
1516         .session_info   = gensec_gssapi_session_info,
1517         .sig_size       = gensec_gssapi_sig_size,
1518         .sign_packet    = gensec_gssapi_sign_packet,
1519         .check_packet   = gensec_gssapi_check_packet,
1520         .seal_packet    = gensec_gssapi_seal_packet,
1521         .unseal_packet  = gensec_gssapi_unseal_packet,
1522         .wrap           = gensec_gssapi_wrap,
1523         .unwrap         = gensec_gssapi_unwrap,
1524         .have_feature   = gensec_gssapi_have_feature,
1525         .enabled        = true,
1526         .kerberos       = true,
1527         .priority       = GENSEC_GSSAPI
1528 };
1529
1530 /* As a server, this could in theory accept any GSSAPI mech */
1531 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1532         .name             = "gssapi_krb5_sasl",
1533         .sasl_name        = "GSSAPI",
1534         .client_start     = gensec_gssapi_sasl_client_start,
1535         .server_start     = gensec_gssapi_sasl_server_start,
1536         .update           = gensec_gssapi_update,
1537         .session_key      = gensec_gssapi_session_key,
1538         .session_info     = gensec_gssapi_session_info,
1539         .max_input_size   = gensec_gssapi_max_input_size,
1540         .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1541         .wrap             = gensec_gssapi_wrap,
1542         .unwrap           = gensec_gssapi_unwrap,
1543         .have_feature     = gensec_gssapi_have_feature,
1544         .enabled          = true,
1545         .kerberos         = true,
1546         .priority         = GENSEC_GSSAPI
1547 };
1548
1549 _PUBLIC_ NTSTATUS gensec_gssapi_init(void)
1550 {
1551         NTSTATUS ret;
1552
1553         ret = gensec_register(&gensec_gssapi_spnego_security_ops);
1554         if (!NT_STATUS_IS_OK(ret)) {
1555                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1556                         gensec_gssapi_spnego_security_ops.name));
1557                 return ret;
1558         }
1559
1560         ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1561         if (!NT_STATUS_IS_OK(ret)) {
1562                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1563                         gensec_gssapi_krb5_security_ops.name));
1564                 return ret;
1565         }
1566
1567         ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1568         if (!NT_STATUS_IS_OK(ret)) {
1569                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1570                         gensec_gssapi_sasl_krb5_security_ops.name));
1571                 return ret;
1572         }
1573
1574         return ret;
1575 }