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 "system/gssapi.h"
  28 #include "auth/kerberos/kerberos.h"
  29 #include "librpc/gen_ndr/krb5pac.h"
  30 #include "auth/auth.h"
  31 #include <ldb.h>
  32 #include "auth/auth_sam.h"
  33 #include "librpc/rpc/dcerpc.h"
  34 #include "auth/credentials/credentials.h"
  35 #include "auth/credentials/credentials_krb5.h"
  36 #include "auth/gensec/gensec.h"
  37 #include "auth/gensec/gensec_proto.h"
  38 #include "auth/gensec/gensec_toplevel_proto.h"
  39 #include "param/param.h"
  40 #include "auth/session_proto.h"
  41 #include "gensec_gssapi.h"
  42 #include "lib/util/util_net.h"
  43 #include "auth/kerberos/pac_utils.h"
  44
  45 _PUBLIC_ NTSTATUS gensec_gssapi_init(void);
  46
  47 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security);
  48 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security);
  49
  50 static int gensec_gssapi_destructor(struct gensec_gssapi_state *gensec_gssapi_state)
  51 {
  52         OM_uint32 maj_stat, min_stat;
  53
  54         if (gensec_gssapi_state->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
  55                 maj_stat = gss_release_cred(&min_stat,
  56                                             &gensec_gssapi_state->delegated_cred_handle);
  57         }
  58
  59         if (gensec_gssapi_state->gssapi_context != GSS_C_NO_CONTEXT) {
  60                 maj_stat = gss_delete_sec_context (&min_stat,
  61                                                    &gensec_gssapi_state->gssapi_context,
  62                                                    GSS_C_NO_BUFFER);
  63         }
  64
  65         if (gensec_gssapi_state->server_name != GSS_C_NO_NAME) {
  66                 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->server_name);
  67         }
  68         if (gensec_gssapi_state->client_name != GSS_C_NO_NAME) {
  69                 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->client_name);
  70         }
  71
  72         if (gensec_gssapi_state->lucid) {
  73                 gss_krb5_free_lucid_sec_context(&min_stat, gensec_gssapi_state->lucid);
  74         }
  75
  76         return 0;
  77 }
  78
  79 static NTSTATUS gensec_gssapi_init_lucid(struct gensec_gssapi_state *gensec_gssapi_state)
  80 {
  81         OM_uint32 maj_stat, min_stat;
  82
  83         if (gensec_gssapi_state->lucid) {
  84                 return NT_STATUS_OK;
  85         }
  86
  87         maj_stat = gss_krb5_export_lucid_sec_context(&min_stat,
  88                                                      &gensec_gssapi_state->gssapi_context,
  89                                                      1,
  90                                                      (void **)&gensec_gssapi_state->lucid);
  91         if (maj_stat != GSS_S_COMPLETE) {
  92                 DEBUG(0,("gensec_gssapi_init_lucid: %s\n",
  93                         gssapi_error_string(gensec_gssapi_state,
  94                                             maj_stat, min_stat,
  95                                             gensec_gssapi_state->gss_oid)));
  96                 return NT_STATUS_INTERNAL_ERROR;
  97         }
  98
  99         if (gensec_gssapi_state->lucid->version != 1) {
 100                 DEBUG(0,("gensec_gssapi_init_lucid: lucid version[%d] != 1\n",
 101                         gensec_gssapi_state->lucid->version));
 102                 gss_krb5_free_lucid_sec_context(&min_stat, gensec_gssapi_state->lucid);
 103                 gensec_gssapi_state->lucid = NULL;
 104                 return NT_STATUS_INTERNAL_ERROR;
 105         }
 106
 107         return NT_STATUS_OK;
 108 }
 109
 110 static NTSTATUS gensec_gssapi_start(struct gensec_security *gensec_security)
 111 {
 112         struct gensec_gssapi_state *gensec_gssapi_state;
 113         krb5_error_code ret;
 114         const char *realm;
 115
 116         gensec_gssapi_state = talloc_zero(gensec_security, struct gensec_gssapi_state);
 117         if (!gensec_gssapi_state) {
 118                 return NT_STATUS_NO_MEMORY;
 119         }
 120
 121         gensec_security->private_data = gensec_gssapi_state;
 122
 123         gensec_gssapi_state->gssapi_context = GSS_C_NO_CONTEXT;
 124
 125         /* TODO: Fill in channel bindings */
 126         gensec_gssapi_state->input_chan_bindings = GSS_C_NO_CHANNEL_BINDINGS;
 127
 128         gensec_gssapi_state->server_name = GSS_C_NO_NAME;
 129         gensec_gssapi_state->client_name = GSS_C_NO_NAME;
 130
 131         gensec_gssapi_state->gss_want_flags = 0;
 132
 133         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation_by_kdc_policy", true)) {
 134                 gensec_gssapi_state->gss_want_flags |= GSS_C_DELEG_POLICY_FLAG;
 135         }
 136         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "mutual", true)) {
 137                 gensec_gssapi_state->gss_want_flags |= GSS_C_MUTUAL_FLAG;
 138         }
 139         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation", true)) {
 140                 gensec_gssapi_state->gss_want_flags |= GSS_C_DELEG_FLAG;
 141         }
 142         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "replay", true)) {
 143                 gensec_gssapi_state->gss_want_flags |= GSS_C_REPLAY_FLAG;
 144         }
 145         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "sequence", true)) {
 146                 gensec_gssapi_state->gss_want_flags |= GSS_C_SEQUENCE_FLAG;
 147         }
 148
 149         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 150                 gensec_gssapi_state->gss_want_flags |= GSS_C_INTEG_FLAG;
 151         }
 152         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 153                 gensec_gssapi_state->gss_want_flags |= GSS_C_INTEG_FLAG;
 154                 gensec_gssapi_state->gss_want_flags |= GSS_C_CONF_FLAG;
 155         }
 156         if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
 157                 gensec_gssapi_state->gss_want_flags |= GSS_C_DCE_STYLE;
 158         }
 159
 160         gensec_gssapi_state->gss_got_flags = 0;
 161
 162         switch (gensec_security->ops->auth_type) {
 163         case DCERPC_AUTH_TYPE_SPNEGO:
 164                 gensec_gssapi_state->gss_oid = gss_mech_spnego;
 165                 break;
 166         case DCERPC_AUTH_TYPE_KRB5:
 167         default:
 168                 gensec_gssapi_state->gss_oid = gss_mech_krb5;
 169                 break;
 170         }
 171
 172         ret = smb_krb5_init_context(gensec_gssapi_state,
 173                                     NULL,
 174                                     gensec_security->settings->lp_ctx,
 175                                     &gensec_gssapi_state->smb_krb5_context);
 176         if (ret) {
 177                 DEBUG(1,("gensec_krb5_start: krb5_init_context failed (%s)\n",
 178                          error_message(ret)));
 179                 talloc_free(gensec_gssapi_state);
 180                 return NT_STATUS_INTERNAL_ERROR;
 181         }
 182
 183         gensec_gssapi_state->client_cred = NULL;
 184         gensec_gssapi_state->server_cred = NULL;
 185
 186         gensec_gssapi_state->lucid = NULL;
 187
 188         gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
 189
 190         gensec_gssapi_state->sasl = false;
 191         gensec_gssapi_state->sasl_state = STAGE_GSS_NEG;
 192         gensec_gssapi_state->sasl_protection = 0;
 193
 194         gensec_gssapi_state->max_wrap_buf_size
 195                 = gensec_setting_int(gensec_security->settings, "gensec_gssapi", "max wrap buf size", 65536);
 196         gensec_gssapi_state->gss_exchange_count = 0;
 197         gensec_gssapi_state->sig_size = 0;
 198
 199         talloc_set_destructor(gensec_gssapi_state, gensec_gssapi_destructor);
 200
 201         realm = lpcfg_realm(gensec_security->settings->lp_ctx);
 202         if (realm != NULL) {
 203                 ret = gsskrb5_set_default_realm(realm);
 204                 if (ret) {
 205                         DEBUG(1,("gensec_krb5_start: gsskrb5_set_default_realm failed\n"));
 206                         talloc_free(gensec_gssapi_state);
 207                         return NT_STATUS_INTERNAL_ERROR;
 208                 }
 209         }
 210
 211         /* don't do DNS lookups of any kind, it might/will fail for a netbios name */
 212         ret = gsskrb5_set_dns_canonicalize(gensec_setting_bool(gensec_security->settings, "krb5", "set_dns_canonicalize", false));
 213         if (ret) {
 214                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_dns_canonicalize failed\n"));
 215                 talloc_free(gensec_gssapi_state);
 216                 return NT_STATUS_INTERNAL_ERROR;
 217         }
 218
 219         return NT_STATUS_OK;
 220 }
 221
 222 static NTSTATUS gensec_gssapi_server_start(struct gensec_security *gensec_security)
 223 {
 224         NTSTATUS nt_status;
 225         int ret;
 226         struct gensec_gssapi_state *gensec_gssapi_state;
 227         struct cli_credentials *machine_account;
 228         struct gssapi_creds_container *gcc;
 229
 230         nt_status = gensec_gssapi_start(gensec_security);
 231         if (!NT_STATUS_IS_OK(nt_status)) {
 232                 return nt_status;
 233         }
 234
 235         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 236
 237         machine_account = gensec_get_credentials(gensec_security);
 238
 239         if (!machine_account) {
 240                 DEBUG(3, ("No machine account credentials specified\n"));
 241                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 242         } else {
 243                 ret = cli_credentials_get_server_gss_creds(machine_account,
 244                                                            gensec_security->settings->lp_ctx, &gcc);
 245                 if (ret) {
 246                         DEBUG(1, ("Aquiring acceptor credentials failed: %s\n",
 247                                   error_message(ret)));
 248                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 249                 }
 250         }
 251
 252         gensec_gssapi_state->server_cred = gcc;
 253         return NT_STATUS_OK;
 254
 255 }
 256
 257 static NTSTATUS gensec_gssapi_sasl_server_start(struct gensec_security *gensec_security)
 258 {
 259         NTSTATUS nt_status;
 260         struct gensec_gssapi_state *gensec_gssapi_state;
 261         nt_status = gensec_gssapi_server_start(gensec_security);
 262
 263         if (NT_STATUS_IS_OK(nt_status)) {
 264                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 265                 gensec_gssapi_state->sasl = true;
 266         }
 267         return nt_status;
 268 }
 269
 270 static NTSTATUS gensec_gssapi_client_creds(struct gensec_security *gensec_security,
 271                                            struct tevent_context *ev)
 272 {
 273         struct gensec_gssapi_state *gensec_gssapi_state;
 274         struct gssapi_creds_container *gcc;
 275         struct cli_credentials *creds = gensec_get_credentials(gensec_security);
 276         const char *error_string;
 277         int ret;
 278
 279         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 280
 281         /* Only run this the first time the update() call is made */
 282         if (gensec_gssapi_state->client_cred) {
 283                 return NT_STATUS_OK;
 284         }
 285
 286         ret = cli_credentials_get_client_gss_creds(creds,
 287                                                    ev,
 288                                                    gensec_security->settings->lp_ctx, &gcc, &error_string);
 289         switch (ret) {
 290         case 0:
 291                 break;
 292         case EINVAL:
 293                 DEBUG(3, ("Cannot obtain client GSS credentials we need to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
 294                 return NT_STATUS_INVALID_PARAMETER;
 295         case KRB5KDC_ERR_PREAUTH_FAILED:
 296         case KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN:
 297                 DEBUG(1, ("Wrong username or password: %s\n", error_string));
 298                 return NT_STATUS_LOGON_FAILURE;
 299         case KRB5_KDC_UNREACH:
 300                 DEBUG(3, ("Cannot reach a KDC we require to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
 301                 return NT_STATUS_NO_LOGON_SERVERS;
 302         case KRB5_CC_NOTFOUND:
 303         case KRB5_CC_END:
 304                 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));
 305                 return NT_STATUS_TIME_DIFFERENCE_AT_DC;
 306         default:
 307                 DEBUG(1, ("Aquiring initiator credentials failed: %s\n", error_string));
 308                 return NT_STATUS_UNSUCCESSFUL;
 309         }
 310
 311         gensec_gssapi_state->client_cred = gcc;
 312         if (!talloc_reference(gensec_gssapi_state, gcc)) {
 313                 return NT_STATUS_NO_MEMORY;
 314         }
 315
 316         return NT_STATUS_OK;
 317 }
 318
 319 static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_security)
 320 {
 321         struct gensec_gssapi_state *gensec_gssapi_state;
 322         struct cli_credentials *creds = gensec_get_credentials(gensec_security);
 323         NTSTATUS nt_status;
 324         gss_buffer_desc name_token;
 325         gss_OID name_type;
 326         OM_uint32 maj_stat, min_stat;
 327         const char *hostname = gensec_get_target_hostname(gensec_security);
 328
 329         if (!hostname) {
 330                 DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
 331                 return NT_STATUS_INVALID_PARAMETER;
 332         }
 333         if (is_ipaddress(hostname)) {
 334                 DEBUG(2, ("Cannot do GSSAPI to an IP address\n"));
 335                 return NT_STATUS_INVALID_PARAMETER;
 336         }
 337         if (strcmp(hostname, "localhost") == 0) {
 338                 DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
 339                 return NT_STATUS_INVALID_PARAMETER;
 340         }
 341
 342         nt_status = gensec_gssapi_start(gensec_security);
 343         if (!NT_STATUS_IS_OK(nt_status)) {
 344                 return nt_status;
 345         }
 346
 347         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 348
 349         if (cli_credentials_get_impersonate_principal(creds)) {
 350                 gensec_gssapi_state->gss_want_flags &= ~(GSS_C_DELEG_FLAG|GSS_C_DELEG_POLICY_FLAG);
 351         }
 352
 353         gensec_gssapi_state->target_principal = gensec_get_target_principal(gensec_security);
 354         if (gensec_gssapi_state->target_principal) {
 355                 name_type = GSS_C_NULL_OID;
 356         } else {
 357                 gensec_gssapi_state->target_principal = talloc_asprintf(gensec_gssapi_state, "%s/%s@%s",
 358                                             gensec_get_target_service(gensec_security),
 359                                             hostname, lpcfg_realm(gensec_security->settings->lp_ctx));
 360
 361                 name_type = GSS_C_NT_USER_NAME;
 362         }
 363         name_token.value  = discard_const_p(uint8_t, gensec_gssapi_state->target_principal);
 364         name_token.length = strlen(gensec_gssapi_state->target_principal);
 365
 366
 367         maj_stat = gss_import_name (&min_stat,
 368                                     &name_token,
 369                                     name_type,
 370                                     &gensec_gssapi_state->server_name);
 371         if (maj_stat) {
 372                 DEBUG(2, ("GSS Import name of %s failed: %s\n",
 373                           (char *)name_token.value,
 374                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 375                 return NT_STATUS_INVALID_PARAMETER;
 376         }
 377
 378         return NT_STATUS_OK;
 379 }
 380
 381 static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
 382 {
 383         NTSTATUS nt_status;
 384         struct gensec_gssapi_state *gensec_gssapi_state;
 385         nt_status = gensec_gssapi_client_start(gensec_security);
 386
 387         if (NT_STATUS_IS_OK(nt_status)) {
 388                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 389                 gensec_gssapi_state->sasl = true;
 390         }
 391         return nt_status;
 392 }
 393
 394
 395 /**
 396  * Next state function for the GSSAPI GENSEC mechanism
 397  *
 398  * @param gensec_gssapi_state GSSAPI State
 399  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 400  * @param in The request, as a DATA_BLOB
 401  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 402  * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
 403  *                or NT_STATUS_OK if the user is authenticated.
 404  */
 405
 406 static NTSTATUS gensec_gssapi_update(struct gensec_security *gensec_security,
 407                                      TALLOC_CTX *out_mem_ctx,
 408                                      struct tevent_context *ev,
 409                                      const DATA_BLOB in, DATA_BLOB *out)
 410 {
 411         struct gensec_gssapi_state *gensec_gssapi_state
 412                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 413         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 414         OM_uint32 maj_stat, min_stat;
 415         OM_uint32 min_stat2;
 416         gss_buffer_desc input_token, output_token;
 417         gss_OID gss_oid_p = NULL;
 418         OM_uint32 time_rec = 0;
 419         struct timeval tv;
 420
 421         input_token.length = in.length;
 422         input_token.value = in.data;
 423
 424         switch (gensec_gssapi_state->sasl_state) {
 425         case STAGE_GSS_NEG:
 426         {
 427                 switch (gensec_security->gensec_role) {
 428                 case GENSEC_CLIENT:
 429                 {
 430                         struct gsskrb5_send_to_kdc send_to_kdc;
 431                         krb5_error_code ret;
 432
 433                         nt_status = gensec_gssapi_client_creds(gensec_security, ev);
 434                         if (!NT_STATUS_IS_OK(nt_status)) {
 435                                 return nt_status;
 436                         }
 437
 438 #ifdef SAMBA4_USES_HEIMDAL
 439                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 440                         send_to_kdc.ptr = ev;
 441 #endif
 442
 443                         min_stat = gsskrb5_set_send_to_kdc(&send_to_kdc);
 444                         if (min_stat) {
 445                                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
 446                                 return NT_STATUS_INTERNAL_ERROR;
 447                         }
 448
 449                         maj_stat = gss_init_sec_context(&min_stat,
 450                                                         gensec_gssapi_state->client_cred->creds,
 451                                                         &gensec_gssapi_state->gssapi_context,
 452                                                         gensec_gssapi_state->server_name,
 453                                                         gensec_gssapi_state->gss_oid,
 454                                                         gensec_gssapi_state->gss_want_flags,
 455                                                         0,
 456                                                         gensec_gssapi_state->input_chan_bindings,
 457                                                         &input_token,
 458                                                         &gss_oid_p,
 459                                                         &output_token,
 460                                                         &gensec_gssapi_state->gss_got_flags, /* ret flags */
 461                                                         &time_rec);
 462                         if (gss_oid_p) {
 463                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 464                         }
 465
 466 #ifdef SAMBA4_USES_HEIMDAL
 467                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 468                         send_to_kdc.ptr = NULL;
 469 #endif
 470
 471                         ret = gsskrb5_set_send_to_kdc(&send_to_kdc);
 472                         if (ret) {
 473                                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
 474                                 return NT_STATUS_INTERNAL_ERROR;
 475                         }
 476
 477                         break;
 478                 }
 479                 case GENSEC_SERVER:
 480                 {
 481                         maj_stat = gss_accept_sec_context(&min_stat,
 482                                                           &gensec_gssapi_state->gssapi_context,
 483                                                           gensec_gssapi_state->server_cred->creds,
 484                                                           &input_token,
 485                                                           gensec_gssapi_state->input_chan_bindings,
 486                                                           &gensec_gssapi_state->client_name,
 487                                                           &gss_oid_p,
 488                                                           &output_token,
 489                                                           &gensec_gssapi_state->gss_got_flags,
 490                                                           &time_rec,
 491                                                           &gensec_gssapi_state->delegated_cred_handle);
 492                         if (gss_oid_p) {
 493                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 494                         }
 495                         break;
 496                 }
 497                 default:
 498                         return NT_STATUS_INVALID_PARAMETER;
 499
 500                 }
 501
 502                 gensec_gssapi_state->gss_exchange_count++;
 503
 504                 if (maj_stat == GSS_S_COMPLETE) {
 505                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 506                         gss_release_buffer(&min_stat2, &output_token);
 507
 508                         if (gensec_gssapi_state->gss_got_flags & GSS_C_DELEG_FLAG) {
 509                                 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
 510                         } else {
 511                                 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
 512                         }
 513
 514                         tv = timeval_current_ofs(time_rec, 0);
 515                         gensec_gssapi_state->expire_time = timeval_to_nttime(&tv);
 516
 517                         /* We may have been invoked as SASL, so there
 518                          * is more work to do */
 519                         if (gensec_gssapi_state->sasl) {
 520                                 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
 521                                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 522                         } else {
 523                                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 524
 525                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 526                                         DEBUG(5, ("GSSAPI Connection will be cryptographically sealed\n"));
 527                                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 528                                         DEBUG(5, ("GSSAPI Connection will be cryptographically signed\n"));
 529                                 } else {
 530                                         DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
 531                                 }
 532
 533                                 return NT_STATUS_OK;
 534                         }
 535                 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
 536                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 537                         gss_release_buffer(&min_stat2, &output_token);
 538
 539                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 540                 } else if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
 541                         gss_cred_id_t creds;
 542                         gss_name_t name;
 543                         gss_buffer_desc buffer;
 544                         OM_uint32 lifetime = 0;
 545                         gss_cred_usage_t usage;
 546                         const char *role = NULL;
 547                         DEBUG(0, ("GSS %s Update(krb5)(%d) Update failed, credentials expired during GSSAPI handshake!\n",
 548                                   role,
 549                                   gensec_gssapi_state->gss_exchange_count));
 550
 551
 552                         switch (gensec_security->gensec_role) {
 553                         case GENSEC_CLIENT:
 554                                 creds = gensec_gssapi_state->client_cred->creds;
 555                                 role = "client";
 556                         case GENSEC_SERVER:
 557                                 creds = gensec_gssapi_state->server_cred->creds;
 558                                 role = "server";
 559                         }
 560
 561                         maj_stat = gss_inquire_cred(&min_stat,
 562                                                     creds,
 563                                                     &name, &lifetime, &usage, NULL);
 564
 565                         if (maj_stat == GSS_S_COMPLETE) {
 566                                 const char *usage_string;
 567                                 switch (usage) {
 568                                 case GSS_C_BOTH:
 569                                         usage_string = "GSS_C_BOTH";
 570                                         break;
 571                                 case GSS_C_ACCEPT:
 572                                         usage_string = "GSS_C_ACCEPT";
 573                                         break;
 574                                 case GSS_C_INITIATE:
 575                                         usage_string = "GSS_C_INITIATE";
 576                                         break;
 577                                 }
 578                                 maj_stat = gss_display_name(&min_stat, name, &buffer, NULL);
 579                                 if (maj_stat) {
 580                                         buffer.value = NULL;
 581                                         buffer.length = 0;
 582                                 }
 583                                 if (lifetime > 0) {
 584                                         DEBUG(0, ("GSSAPI gss_inquire_cred indicates expiry of %*.*s in %u sec for %s\n",
 585                                                   (int)buffer.length, (int)buffer.length, (char *)buffer.value,
 586                                                   lifetime, usage_string));
 587                                 } else {
 588                                         DEBUG(0, ("GSSAPI gss_inquire_cred indicates %*.*s has already expired for %s\n",
 589                                                   (int)buffer.length, (int)buffer.length, (char *)buffer.value,
 590                                                   usage_string));
 591                                 }
 592                                 gss_release_buffer(&min_stat, &buffer);
 593                                 gss_release_name(&min_stat, &name);
 594                         } else if (maj_stat != GSS_S_COMPLETE) {
 595                                 DEBUG(0, ("inquiry of credential lifefime via GSSAPI gss_inquire_cred failed: %s\n",
 596                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 597                         }
 598                         return NT_STATUS_INVALID_PARAMETER;
 599                 } else if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
 600                         switch (min_stat) {
 601                         case KRB5KRB_AP_ERR_TKT_NYV:
 602                                 DEBUG(1, ("Error with ticket to contact %s: possible clock skew between us and the KDC or target server: %s\n",
 603                                           gensec_gssapi_state->target_principal,
 604                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 605                                 return NT_STATUS_TIME_DIFFERENCE_AT_DC; /* Make SPNEGO ignore us, we can't go any further here */
 606                         case KRB5KRB_AP_ERR_TKT_EXPIRED:
 607                                 DEBUG(1, ("Error with ticket to contact %s: ticket is expired, possible clock skew between us and the KDC or target server: %s\n",
 608                                           gensec_gssapi_state->target_principal,
 609                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 610                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 611                         case KRB5_KDC_UNREACH:
 612                                 DEBUG(3, ("Cannot reach a KDC we require in order to obtain a ticetk to %s: %s\n",
 613                                           gensec_gssapi_state->target_principal,
 614                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 615                                 return NT_STATUS_NO_LOGON_SERVERS; /* Make SPNEGO ignore us, we can't go any further here */
 616                         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 617                                 DEBUG(3, ("Server %s is not registered with our KDC: %s\n",
 618                                           gensec_gssapi_state->target_principal,
 619                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 620                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 621                         case KRB5KRB_AP_ERR_MSG_TYPE:
 622                                 /* garbage input, possibly from the auto-mech detection */
 623                                 return NT_STATUS_INVALID_PARAMETER;
 624                         default:
 625                                 DEBUG(1, ("GSS %s Update(krb5)(%d) Update failed: %s\n",
 626                                           gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 627                                           gensec_gssapi_state->gss_exchange_count,
 628                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 629                                 return nt_status;
 630                         }
 631                 } else {
 632                         DEBUG(1, ("GSS %s Update(%d) failed: %s\n",
 633                                   gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 634                                   gensec_gssapi_state->gss_exchange_count,
 635                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 636                         return nt_status;
 637                 }
 638                 break;
 639         }
 640
 641         /* These last two stages are only done if we were invoked as SASL */
 642         case STAGE_SASL_SSF_NEG:
 643         {
 644                 switch (gensec_security->gensec_role) {
 645                 case GENSEC_CLIENT:
 646                 {
 647                         uint8_t maxlength_proposed[4];
 648                         uint8_t maxlength_accepted[4];
 649                         uint8_t security_supported;
 650                         int conf_state;
 651                         gss_qop_t qop_state;
 652                         input_token.length = in.length;
 653                         input_token.value = in.data;
 654
 655                         /* As a client, we have just send a
 656                          * zero-length blob to the server (after the
 657                          * normal GSSAPI exchange), and it has replied
 658                          * with it's SASL negotiation */
 659
 660                         maj_stat = gss_unwrap(&min_stat,
 661                                               gensec_gssapi_state->gssapi_context,
 662                                               &input_token,
 663                                               &output_token,
 664                                               &conf_state,
 665                                               &qop_state);
 666                         if (GSS_ERROR(maj_stat)) {
 667                                 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 668                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 669                                 return NT_STATUS_ACCESS_DENIED;
 670                         }
 671
 672                         if (output_token.length < 4) {
 673                                 return NT_STATUS_INVALID_PARAMETER;
 674                         }
 675
 676                         memcpy(maxlength_proposed, output_token.value, 4);
 677                         gss_release_buffer(&min_stat, &output_token);
 678
 679                         /* first byte is the proposed security */
 680                         security_supported = maxlength_proposed[0];
 681                         maxlength_proposed[0] = '\0';
 682
 683                         /* Rest is the proposed max wrap length */
 684                         gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
 685                                                                      gensec_gssapi_state->max_wrap_buf_size);
 686                         gensec_gssapi_state->sasl_protection = 0;
 687                         if (security_supported & NEG_SEAL) {
 688                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 689                                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 690                                 }
 691                         }
 692                         if (security_supported & NEG_SIGN) {
 693                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 694                                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 695                                 }
 696                         }
 697                         if (security_supported & NEG_NONE) {
 698                                 gensec_gssapi_state->sasl_protection |= NEG_NONE;
 699                         }
 700                         if (gensec_gssapi_state->sasl_protection == 0) {
 701                                 DEBUG(1, ("Remote server does not support unprotected connections\n"));
 702                                 return NT_STATUS_ACCESS_DENIED;
 703                         }
 704
 705                         /* Send back the negotiated max length */
 706
 707                         RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
 708
 709                         maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
 710
 711                         input_token.value = maxlength_accepted;
 712                         input_token.length = sizeof(maxlength_accepted);
 713
 714                         maj_stat = gss_wrap(&min_stat,
 715                                             gensec_gssapi_state->gssapi_context,
 716                                             false,
 717                                             GSS_C_QOP_DEFAULT,
 718                                             &input_token,
 719                                             &conf_state,
 720                                             &output_token);
 721                         if (GSS_ERROR(maj_stat)) {
 722                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 723                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 724                                 return NT_STATUS_ACCESS_DENIED;
 725                         }
 726
 727                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 728                         gss_release_buffer(&min_stat, &output_token);
 729
 730                         /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 731                         gensec_gssapi_state->sasl_state = STAGE_DONE;
 732
 733                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 734                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically sealed\n"));
 735                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 736                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically signed\n"));
 737                         } else {
 738                                 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographically protection\n"));
 739                         }
 740
 741                         return NT_STATUS_OK;
 742                 }
 743                 case GENSEC_SERVER:
 744                 {
 745                         uint8_t maxlength_proposed[4];
 746                         uint8_t security_supported = 0x0;
 747                         int conf_state;
 748
 749                         /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
 750                         if (in.length != 0) {
 751                                 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
 752                         }
 753
 754                         /* Give the client some idea what we will support */
 755
 756                         RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
 757                         /* first byte is the proposed security */
 758                         maxlength_proposed[0] = '\0';
 759
 760                         gensec_gssapi_state->sasl_protection = 0;
 761                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 762                                 security_supported |= NEG_SEAL;
 763                         }
 764                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 765                                 security_supported |= NEG_SIGN;
 766                         }
 767                         if (security_supported == 0) {
 768                                 /* If we don't support anything, this must be 0 */
 769                                 RSIVAL(maxlength_proposed, 0, 0x0);
 770                         }
 771
 772                         /* TODO:  We may not wish to support this */
 773                         security_supported |= NEG_NONE;
 774                         maxlength_proposed[0] = security_supported;
 775
 776                         input_token.value = maxlength_proposed;
 777                         input_token.length = sizeof(maxlength_proposed);
 778
 779                         maj_stat = gss_wrap(&min_stat,
 780                                             gensec_gssapi_state->gssapi_context,
 781                                             false,
 782                                             GSS_C_QOP_DEFAULT,
 783                                             &input_token,
 784                                             &conf_state,
 785                                             &output_token);
 786                         if (GSS_ERROR(maj_stat)) {
 787                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 788                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 789                                 return NT_STATUS_ACCESS_DENIED;
 790                         }
 791
 792                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 793                         gss_release_buffer(&min_stat, &output_token);
 794
 795                         gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
 796                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 797                 }
 798                 default:
 799                         return NT_STATUS_INVALID_PARAMETER;
 800
 801                 }
 802         }
 803         /* This is s server-only stage */
 804         case STAGE_SASL_SSF_ACCEPT:
 805         {
 806                 uint8_t maxlength_accepted[4];
 807                 uint8_t security_accepted;
 808                 int conf_state;
 809                 gss_qop_t qop_state;
 810                 input_token.length = in.length;
 811                 input_token.value = in.data;
 812
 813                 maj_stat = gss_unwrap(&min_stat,
 814                                       gensec_gssapi_state->gssapi_context,
 815                                       &input_token,
 816                                       &output_token,
 817                                       &conf_state,
 818                                       &qop_state);
 819                 if (GSS_ERROR(maj_stat)) {
 820                         DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 821                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 822                         return NT_STATUS_ACCESS_DENIED;
 823                 }
 824
 825                 if (output_token.length < 4) {
 826                         return NT_STATUS_INVALID_PARAMETER;
 827                 }
 828
 829                 memcpy(maxlength_accepted, output_token.value, 4);
 830                 gss_release_buffer(&min_stat, &output_token);
 831
 832                 /* first byte is the proposed security */
 833                 security_accepted = maxlength_accepted[0];
 834                 maxlength_accepted[0] = '\0';
 835
 836                 /* Rest is the proposed max wrap length */
 837                 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
 838                                                              gensec_gssapi_state->max_wrap_buf_size);
 839
 840                 gensec_gssapi_state->sasl_protection = 0;
 841                 if (security_accepted & NEG_SEAL) {
 842                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 843                                 DEBUG(1, ("Remote client wanted seal, but gensec refused\n"));
 844                                 return NT_STATUS_ACCESS_DENIED;
 845                         }
 846                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 847                 }
 848                 if (security_accepted & NEG_SIGN) {
 849                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 850                                 DEBUG(1, ("Remote client wanted sign, but gensec refused\n"));
 851                                 return NT_STATUS_ACCESS_DENIED;
 852                         }
 853                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 854                 }
 855                 if (security_accepted & NEG_NONE) {
 856                         gensec_gssapi_state->sasl_protection |= NEG_NONE;
 857                 }
 858
 859                 /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 860                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 861                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 862                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically sealed\n"));
 863                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 864                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically signed\n"));
 865                 } else {
 866                         DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
 867                 }
 868
 869                 *out = data_blob(NULL, 0);
 870                 return NT_STATUS_OK;
 871         }
 872         default:
 873                 return NT_STATUS_INVALID_PARAMETER;
 874         }
 875 }
 876
 877 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
 878                                    TALLOC_CTX *mem_ctx,
 879                                    const DATA_BLOB *in,
 880                                    DATA_BLOB *out)
 881 {
 882         struct gensec_gssapi_state *gensec_gssapi_state
 883                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 884         OM_uint32 maj_stat, min_stat;
 885         gss_buffer_desc input_token, output_token;
 886         int conf_state;
 887         input_token.length = in->length;
 888         input_token.value = in->data;
 889
 890         maj_stat = gss_wrap(&min_stat,
 891                             gensec_gssapi_state->gssapi_context,
 892                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 893                             GSS_C_QOP_DEFAULT,
 894                             &input_token,
 895                             &conf_state,
 896                             &output_token);
 897         if (GSS_ERROR(maj_stat)) {
 898                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 899                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 900                 return NT_STATUS_ACCESS_DENIED;
 901         }
 902
 903         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 904         gss_release_buffer(&min_stat, &output_token);
 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 < out->length) {
 909                         DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
 910                                   (unsigned)in->length,
 911                                   (unsigned)out->length,
 912                                   (unsigned int)max_wrapped_size));
 913                         return NT_STATUS_INVALID_PARAMETER;
 914                 }
 915         }
 916
 917         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 918             && !conf_state) {
 919                 return NT_STATUS_ACCESS_DENIED;
 920         }
 921         return NT_STATUS_OK;
 922 }
 923
 924 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
 925                                      TALLOC_CTX *mem_ctx,
 926                                      const DATA_BLOB *in,
 927                                      DATA_BLOB *out)
 928 {
 929         struct gensec_gssapi_state *gensec_gssapi_state
 930                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 931         OM_uint32 maj_stat, min_stat;
 932         gss_buffer_desc input_token, output_token;
 933         int conf_state;
 934         gss_qop_t qop_state;
 935         input_token.length = in->length;
 936         input_token.value = in->data;
 937
 938         if (gensec_gssapi_state->sasl) {
 939                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 940                 if (max_wrapped_size < in->length) {
 941                         DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
 942                         return NT_STATUS_INVALID_PARAMETER;
 943                 }
 944         }
 945
 946         maj_stat = gss_unwrap(&min_stat,
 947                               gensec_gssapi_state->gssapi_context,
 948                               &input_token,
 949                               &output_token,
 950                               &conf_state,
 951                               &qop_state);
 952         if (GSS_ERROR(maj_stat)) {
 953                 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
 954                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 955                 return NT_STATUS_ACCESS_DENIED;
 956         }
 957
 958         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 959         gss_release_buffer(&min_stat, &output_token);
 960
 961         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 962             && !conf_state) {
 963                 return NT_STATUS_ACCESS_DENIED;
 964         }
 965         return NT_STATUS_OK;
 966 }
 967
 968 /* Find out the maximum input size negotiated on this connection */
 969
 970 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
 971 {
 972         struct gensec_gssapi_state *gensec_gssapi_state
 973                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 974         OM_uint32 maj_stat, min_stat;
 975         OM_uint32 max_input_size;
 976
 977         maj_stat = gss_wrap_size_limit(&min_stat,
 978                                        gensec_gssapi_state->gssapi_context,
 979                                        gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 980                                        GSS_C_QOP_DEFAULT,
 981                                        gensec_gssapi_state->max_wrap_buf_size,
 982                                        &max_input_size);
 983         if (GSS_ERROR(maj_stat)) {
 984                 TALLOC_CTX *mem_ctx = talloc_new(NULL);
 985                 DEBUG(1, ("gensec_gssapi_max_input_size: determinaing signature size with gss_wrap_size_limit failed: %s\n",
 986                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 987                 talloc_free(mem_ctx);
 988                 return 0;
 989         }
 990
 991         return max_input_size;
 992 }
 993
 994 /* Find out the maximum output size negotiated on this connection */
 995 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
 996 {
 997         struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
 998         return gensec_gssapi_state->max_wrap_buf_size;
 999 }
1000
1001 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
1002                                           TALLOC_CTX *mem_ctx,
1003                                           uint8_t *data, size_t length,
1004                                           const uint8_t *whole_pdu, size_t pdu_length,
1005                                           DATA_BLOB *sig)
1006 {
1007         struct gensec_gssapi_state *gensec_gssapi_state
1008                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1009         OM_uint32 maj_stat, min_stat;
1010         gss_buffer_desc input_token, output_token;
1011         int conf_state;
1012         ssize_t sig_length;
1013
1014         input_token.length = length;
1015         input_token.value = data;
1016
1017         maj_stat = gss_wrap(&min_stat,
1018                             gensec_gssapi_state->gssapi_context,
1019                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
1020                             GSS_C_QOP_DEFAULT,
1021                             &input_token,
1022                             &conf_state,
1023                             &output_token);
1024         if (GSS_ERROR(maj_stat)) {
1025                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
1026                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1027                 return NT_STATUS_ACCESS_DENIED;
1028         }
1029
1030         if (output_token.length < input_token.length) {
1031                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
1032                           (long)output_token.length, (long)length));
1033                 return NT_STATUS_INTERNAL_ERROR;
1034         }
1035         sig_length = output_token.length - input_token.length;
1036
1037         memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
1038         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
1039
1040         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1041         dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
1042         dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
1043
1044         gss_release_buffer(&min_stat, &output_token);
1045
1046         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1047             && !conf_state) {
1048                 return NT_STATUS_ACCESS_DENIED;
1049         }
1050         return NT_STATUS_OK;
1051 }
1052
1053 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
1054                                             uint8_t *data, size_t length,
1055                                             const uint8_t *whole_pdu, size_t pdu_length,
1056                                             const DATA_BLOB *sig)
1057 {
1058         struct gensec_gssapi_state *gensec_gssapi_state
1059                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1060         OM_uint32 maj_stat, min_stat;
1061         gss_buffer_desc input_token, output_token;
1062         int conf_state;
1063         gss_qop_t qop_state;
1064         DATA_BLOB in;
1065
1066         dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
1067
1068         in = data_blob_talloc(gensec_security, NULL, sig->length + length);
1069
1070         memcpy(in.data, sig->data, sig->length);
1071         memcpy(in.data + sig->length, data, length);
1072
1073         input_token.length = in.length;
1074         input_token.value = in.data;
1075
1076         maj_stat = gss_unwrap(&min_stat,
1077                               gensec_gssapi_state->gssapi_context,
1078                               &input_token,
1079                               &output_token,
1080                               &conf_state,
1081                               &qop_state);
1082         talloc_free(in.data);
1083         if (GSS_ERROR(maj_stat)) {
1084                 char *error_string = gssapi_error_string(NULL, maj_stat, min_stat, gensec_gssapi_state->gss_oid);
1085                 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
1086                           error_string));
1087                 talloc_free(error_string);
1088                 return NT_STATUS_ACCESS_DENIED;
1089         }
1090
1091         if (output_token.length != length) {
1092                 return NT_STATUS_INTERNAL_ERROR;
1093         }
1094
1095         memcpy(data, output_token.value, length);
1096
1097         gss_release_buffer(&min_stat, &output_token);
1098
1099         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1100             && !conf_state) {
1101                 return NT_STATUS_ACCESS_DENIED;
1102         }
1103         return NT_STATUS_OK;
1104 }
1105
1106 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1107                                           TALLOC_CTX *mem_ctx,
1108                                           const uint8_t *data, size_t length,
1109                                           const uint8_t *whole_pdu, size_t pdu_length,
1110                                           DATA_BLOB *sig)
1111 {
1112         struct gensec_gssapi_state *gensec_gssapi_state
1113                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1114         OM_uint32 maj_stat, min_stat;
1115         gss_buffer_desc input_token, output_token;
1116
1117         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1118                 input_token.length = pdu_length;
1119                 input_token.value = discard_const_p(uint8_t *, whole_pdu);
1120         } else {
1121                 input_token.length = length;
1122                 input_token.value = discard_const_p(uint8_t *, data);
1123         }
1124
1125         maj_stat = gss_get_mic(&min_stat,
1126                             gensec_gssapi_state->gssapi_context,
1127                             GSS_C_QOP_DEFAULT,
1128                             &input_token,
1129                             &output_token);
1130         if (GSS_ERROR(maj_stat)) {
1131                 DEBUG(1, ("GSS GetMic failed: %s\n",
1132                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1133                 return NT_STATUS_ACCESS_DENIED;
1134         }
1135
1136         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, output_token.length);
1137
1138         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1139
1140         gss_release_buffer(&min_stat, &output_token);
1141
1142         return NT_STATUS_OK;
1143 }
1144
1145 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1146                                            const uint8_t *data, size_t length,
1147                                            const uint8_t *whole_pdu, size_t pdu_length,
1148                                            const DATA_BLOB *sig)
1149 {
1150         struct gensec_gssapi_state *gensec_gssapi_state
1151                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1152         OM_uint32 maj_stat, min_stat;
1153         gss_buffer_desc input_token;
1154         gss_buffer_desc input_message;
1155         gss_qop_t qop_state;
1156
1157         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1158
1159         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1160                 input_message.length = pdu_length;
1161                 input_message.value = discard_const(whole_pdu);
1162         } else {
1163                 input_message.length = length;
1164                 input_message.value = discard_const(data);
1165         }
1166
1167         input_token.length = sig->length;
1168         input_token.value = sig->data;
1169
1170         maj_stat = gss_verify_mic(&min_stat,
1171                               gensec_gssapi_state->gssapi_context,
1172                               &input_message,
1173                               &input_token,
1174                               &qop_state);
1175         if (GSS_ERROR(maj_stat)) {
1176                 char *error_string = gssapi_error_string(NULL, maj_stat, min_stat, gensec_gssapi_state->gss_oid);
1177                 DEBUG(1, ("GSS VerifyMic failed: %s\n", error_string));
1178                 talloc_free(error_string);
1179
1180                 return NT_STATUS_ACCESS_DENIED;
1181         }
1182
1183         return NT_STATUS_OK;
1184 }
1185
1186 /* Try to figure out what features we actually got on the connection */
1187 static bool gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1188                                        uint32_t feature)
1189 {
1190         struct gensec_gssapi_state *gensec_gssapi_state
1191                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1192         if (feature & GENSEC_FEATURE_SIGN) {
1193                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1194                 if (gensec_gssapi_state->sasl
1195                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1196                         return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1197                                 && (gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG));
1198                 }
1199                 return gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG;
1200         }
1201         if (feature & GENSEC_FEATURE_SEAL) {
1202                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1203                 if (gensec_gssapi_state->sasl
1204                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1205                         return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1206                                  && (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG));
1207                 }
1208                 return gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG;
1209         }
1210         if (feature & GENSEC_FEATURE_SESSION_KEY) {
1211                 /* Only for GSSAPI/Krb5 */
1212                 if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
1213                         return true;
1214                 }
1215         }
1216         if (feature & GENSEC_FEATURE_DCE_STYLE) {
1217                 return gensec_gssapi_state->gss_got_flags & GSS_C_DCE_STYLE;
1218         }
1219         if (feature & GENSEC_FEATURE_NEW_SPNEGO) {
1220                 NTSTATUS status;
1221                 uint32_t keytype;
1222
1223                 if (!(gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG)) {
1224                         return false;
1225                 }
1226
1227                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "force_new_spnego", false)) {
1228                         return true;
1229                 }
1230                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "disable_new_spnego", false)) {
1231                         return false;
1232                 }
1233
1234                 status = gssapi_get_session_key(gensec_gssapi_state,
1235                                                 gensec_gssapi_state->gssapi_context, NULL, &keytype);
1236                 /*
1237                  * We should do a proper sig on the mechListMic unless
1238                  * we know we have to be backwards compatible with
1239                  * earlier windows versions.
1240                  *
1241                  * Negotiating a non-krb5
1242                  * mech for example should be regarded as having
1243                  * NEW_SPNEGO
1244                  */
1245                 if (NT_STATUS_IS_OK(status)) {
1246                         switch (keytype) {
1247                         case ENCTYPE_DES_CBC_CRC:
1248                         case ENCTYPE_DES_CBC_MD5:
1249                         case ENCTYPE_ARCFOUR_HMAC:
1250                         case ENCTYPE_DES3_CBC_SHA1:
1251                                 return false;
1252                         }
1253                 }
1254                 return true;
1255         }
1256         /* We can always do async (rather than strict request/reply) packets.  */
1257         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1258                 return true;
1259         }
1260         return false;
1261 }
1262
1263 /*
1264  * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1265  * (for encrypting some passwords).
1266  *
1267  * This breaks all the abstractions, but what do you expect...
1268  */
1269 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1270                                           TALLOC_CTX *mem_ctx,
1271                                           DATA_BLOB *session_key)
1272 {
1273         struct gensec_gssapi_state *gensec_gssapi_state
1274                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1275         return gssapi_get_session_key(mem_ctx, gensec_gssapi_state->gssapi_context, session_key, NULL);
1276 }
1277
1278 /* Get some basic (and authorization) information about the user on
1279  * this session.  This uses either the PAC (if present) or a local
1280  * database lookup */
1281 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1282                                            TALLOC_CTX *mem_ctx,
1283                                            struct auth_session_info **_session_info)
1284 {
1285         NTSTATUS nt_status;
1286         TALLOC_CTX *tmp_ctx;
1287         struct gensec_gssapi_state *gensec_gssapi_state
1288                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1289         struct auth_session_info *session_info = NULL;
1290         OM_uint32 maj_stat, min_stat;
1291         DATA_BLOB pac_blob, *pac_blob_ptr = NULL;
1292
1293         gss_buffer_desc name_token;
1294         char *principal_string;
1295
1296         tmp_ctx = talloc_named(mem_ctx, 0, "gensec_gssapi_session_info context");
1297         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
1298
1299         maj_stat = gss_display_name (&min_stat,
1300                                      gensec_gssapi_state->client_name,
1301                                      &name_token,
1302                                      NULL);
1303         if (GSS_ERROR(maj_stat)) {
1304                 DEBUG(1, ("GSS display_name failed: %s\n",
1305                           gssapi_error_string(tmp_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1306                 talloc_free(tmp_ctx);
1307                 return NT_STATUS_FOOBAR;
1308         }
1309
1310         principal_string = talloc_strndup(tmp_ctx,
1311                                           (const char *)name_token.value,
1312                                           name_token.length);
1313
1314         gss_release_buffer(&min_stat, &name_token);
1315
1316         if (!principal_string) {
1317                 talloc_free(tmp_ctx);
1318                 return NT_STATUS_NO_MEMORY;
1319         }
1320
1321         nt_status = gssapi_obtain_pac_blob(tmp_ctx,  gensec_gssapi_state->gssapi_context,
1322                                            gensec_gssapi_state->client_name,
1323                                            &pac_blob);
1324
1325         /* IF we have the PAC - otherwise we need to get this
1326          * data from elsewere - local ldb, or (TODO) lookup of some
1327          * kind...
1328          */
1329         if (NT_STATUS_IS_OK(nt_status)) {
1330                 pac_blob_ptr = &pac_blob;
1331         }
1332         nt_status = gensec_generate_session_info_pac(tmp_ctx,
1333                                                      gensec_security,
1334                                                      gensec_gssapi_state->smb_krb5_context,
1335                                                      pac_blob_ptr, principal_string,
1336                                                      gensec_get_remote_address(gensec_security),
1337                                                      &session_info);
1338         if (!NT_STATUS_IS_OK(nt_status)) {
1339                 talloc_free(tmp_ctx);
1340                 return nt_status;
1341         }
1342
1343         nt_status = gensec_gssapi_session_key(gensec_security, session_info, &session_info->session_key);
1344         if (!NT_STATUS_IS_OK(nt_status)) {
1345                 talloc_free(tmp_ctx);
1346                 return nt_status;
1347         }
1348
1349         if (!(gensec_gssapi_state->gss_got_flags & GSS_C_DELEG_FLAG)) {
1350                 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1351         } else {
1352                 krb5_error_code ret;
1353                 const char *error_string;
1354
1355                 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1356                 session_info->credentials = cli_credentials_init(session_info);
1357                 if (!session_info->credentials) {
1358                         talloc_free(tmp_ctx);
1359                         return NT_STATUS_NO_MEMORY;
1360                 }
1361
1362                 cli_credentials_set_conf(session_info->credentials, gensec_security->settings->lp_ctx);
1363                 /* Just so we don't segfault trying to get at a username */
1364                 cli_credentials_set_anonymous(session_info->credentials);
1365
1366                 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1367                                                            gensec_security->settings->lp_ctx,
1368                                                            gensec_gssapi_state->delegated_cred_handle,
1369                                                            CRED_SPECIFIED, &error_string);
1370                 if (ret) {
1371                         talloc_free(tmp_ctx);
1372                         DEBUG(2,("Failed to get gss creds: %s\n", error_string));
1373                         return NT_STATUS_NO_MEMORY;
1374                 }
1375
1376                 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1377                 cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
1378
1379                 /* It has been taken from this place... */
1380                 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1381         }
1382         *_session_info = talloc_steal(mem_ctx, session_info);
1383         talloc_free(tmp_ctx);
1384
1385         return NT_STATUS_OK;
1386 }
1387
1388 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
1389 {
1390         struct gensec_gssapi_state *gensec_gssapi_state
1391                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1392         NTSTATUS status;
1393
1394         if (gensec_gssapi_state->sig_size) {
1395                 return gensec_gssapi_state->sig_size;
1396         }
1397
1398         if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1399                 gensec_gssapi_state->sig_size = 45;
1400         } else {
1401                 gensec_gssapi_state->sig_size = 37;
1402         }
1403
1404         status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1405         if (!NT_STATUS_IS_OK(status)) {
1406                 return gensec_gssapi_state->sig_size;
1407         }
1408
1409         if (gensec_gssapi_state->lucid->protocol == 1) {
1410                 if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1411                         /*
1412                          * TODO: windows uses 76 here, but we don't know
1413                          *       gss_wrap works with aes keys yet
1414                          */
1415                         gensec_gssapi_state->sig_size = 76;
1416                 } else {
1417                         gensec_gssapi_state->sig_size = 28;
1418                 }
1419         } else if (gensec_gssapi_state->lucid->protocol == 0) {
1420                 switch (gensec_gssapi_state->lucid->rfc1964_kd.ctx_key.type) {
1421                 case KEYTYPE_DES:
1422                 case KEYTYPE_ARCFOUR:
1423                 case KEYTYPE_ARCFOUR_56:
1424                         if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1425                                 gensec_gssapi_state->sig_size = 45;
1426                         } else {
1427                                 gensec_gssapi_state->sig_size = 37;
1428                         }
1429                         break;
1430                 case KEYTYPE_DES3:
1431                         if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1432                                 gensec_gssapi_state->sig_size = 57;
1433                         } else {
1434                                 gensec_gssapi_state->sig_size = 49;
1435                         }
1436                         break;
1437                 }
1438         }
1439
1440         return gensec_gssapi_state->sig_size;
1441 }
1442
1443 static const char *gensec_gssapi_krb5_oids[] = {
1444         GENSEC_OID_KERBEROS5_OLD,
1445         GENSEC_OID_KERBEROS5,
1446         NULL
1447 };
1448
1449 static const char *gensec_gssapi_spnego_oids[] = {
1450         GENSEC_OID_SPNEGO,
1451         NULL
1452 };
1453
1454 /* As a server, this could in theory accept any GSSAPI mech */
1455 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1456         .name           = "gssapi_spnego",
1457         .sasl_name      = "GSS-SPNEGO",
1458         .auth_type      = DCERPC_AUTH_TYPE_SPNEGO,
1459         .oid            = gensec_gssapi_spnego_oids,
1460         .client_start   = gensec_gssapi_client_start,
1461         .server_start   = gensec_gssapi_server_start,
1462         .magic          = gensec_magic_check_krb5_oid,
1463         .update         = gensec_gssapi_update,
1464         .session_key    = gensec_gssapi_session_key,
1465         .session_info   = gensec_gssapi_session_info,
1466         .sign_packet    = gensec_gssapi_sign_packet,
1467         .check_packet   = gensec_gssapi_check_packet,
1468         .seal_packet    = gensec_gssapi_seal_packet,
1469         .unseal_packet  = gensec_gssapi_unseal_packet,
1470         .wrap           = gensec_gssapi_wrap,
1471         .unwrap         = gensec_gssapi_unwrap,
1472         .have_feature   = gensec_gssapi_have_feature,
1473         .enabled        = false,
1474         .kerberos       = true,
1475         .priority       = GENSEC_GSSAPI
1476 };
1477
1478 /* As a server, this could in theory accept any GSSAPI mech */
1479 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1480         .name           = "gssapi_krb5",
1481         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
1482         .oid            = gensec_gssapi_krb5_oids,
1483         .client_start   = gensec_gssapi_client_start,
1484         .server_start   = gensec_gssapi_server_start,
1485         .magic          = gensec_magic_check_krb5_oid,
1486         .update         = gensec_gssapi_update,
1487         .session_key    = gensec_gssapi_session_key,
1488         .session_info   = gensec_gssapi_session_info,
1489         .sig_size       = gensec_gssapi_sig_size,
1490         .sign_packet    = gensec_gssapi_sign_packet,
1491         .check_packet   = gensec_gssapi_check_packet,
1492         .seal_packet    = gensec_gssapi_seal_packet,
1493         .unseal_packet  = gensec_gssapi_unseal_packet,
1494         .wrap           = gensec_gssapi_wrap,
1495         .unwrap         = gensec_gssapi_unwrap,
1496         .have_feature   = gensec_gssapi_have_feature,
1497         .enabled        = true,
1498         .kerberos       = true,
1499         .priority       = GENSEC_GSSAPI
1500 };
1501
1502 /* As a server, this could in theory accept any GSSAPI mech */
1503 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1504         .name             = "gssapi_krb5_sasl",
1505         .sasl_name        = "GSSAPI",
1506         .client_start     = gensec_gssapi_sasl_client_start,
1507         .server_start     = gensec_gssapi_sasl_server_start,
1508         .update           = gensec_gssapi_update,
1509         .session_key      = gensec_gssapi_session_key,
1510         .session_info     = gensec_gssapi_session_info,
1511         .max_input_size   = gensec_gssapi_max_input_size,
1512         .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1513         .wrap             = gensec_gssapi_wrap,
1514         .unwrap           = gensec_gssapi_unwrap,
1515         .have_feature     = gensec_gssapi_have_feature,
1516         .enabled          = true,
1517         .kerberos         = true,
1518         .priority         = GENSEC_GSSAPI
1519 };
1520
1521 _PUBLIC_ NTSTATUS gensec_gssapi_init(void)
1522 {
1523         NTSTATUS ret;
1524
1525         ret = gensec_register(&gensec_gssapi_spnego_security_ops);
1526         if (!NT_STATUS_IS_OK(ret)) {
1527                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1528                         gensec_gssapi_spnego_security_ops.name));
1529                 return ret;
1530         }
1531
1532         ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1533         if (!NT_STATUS_IS_OK(ret)) {
1534                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1535                         gensec_gssapi_krb5_security_ops.name));
1536                 return ret;
1537         }
1538
1539         ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1540         if (!NT_STATUS_IS_OK(ret)) {
1541                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1542                         gensec_gssapi_sasl_krb5_security_ops.name));
1543                 return ret;
1544         }
1545
1546         return ret;
1547 }