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/gen_ndr/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_internal.h"
  38 #include "auth/gensec/gensec_proto.h"
  39 #include "auth/gensec/gensec_toplevel_proto.h"
  40 #include "param/param.h"
  41 #include "auth/session_proto.h"
  42 #include "gensec_gssapi.h"
  43 #include "lib/util/util_net.h"
  44 #include "auth/kerberos/pac_utils.h"
  45
  46 #ifndef gss_mech_spnego
  47 gss_OID_desc spnego_mech_oid_desc =
  48                 { 6, discard_const_p(void, "\x2b\x06\x01\x05\x05\x02") };
  49 #define gss_mech_spnego (&spnego_mech_oid_desc)
  50 #endif
  51
  52 _PUBLIC_ NTSTATUS gensec_gssapi_init(void);
  53
  54 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security);
  55 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security);
  56
  57 static int gensec_gssapi_destructor(struct gensec_gssapi_state *gensec_gssapi_state)
  58 {
  59         OM_uint32 maj_stat, min_stat;
  60
  61         if (gensec_gssapi_state->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
  62                 maj_stat = gss_release_cred(&min_stat,
  63                                             &gensec_gssapi_state->delegated_cred_handle);
  64         }
  65
  66         if (gensec_gssapi_state->gssapi_context != GSS_C_NO_CONTEXT) {
  67                 maj_stat = gss_delete_sec_context (&min_stat,
  68                                                    &gensec_gssapi_state->gssapi_context,
  69                                                    GSS_C_NO_BUFFER);
  70         }
  71
  72         if (gensec_gssapi_state->server_name != GSS_C_NO_NAME) {
  73                 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->server_name);
  74         }
  75         if (gensec_gssapi_state->client_name != GSS_C_NO_NAME) {
  76                 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->client_name);
  77         }
  78
  79         if (gensec_gssapi_state->lucid) {
  80                 gss_krb5_free_lucid_sec_context(&min_stat, gensec_gssapi_state->lucid);
  81         }
  82
  83         return 0;
  84 }
  85
  86 static NTSTATUS gensec_gssapi_init_lucid(struct gensec_gssapi_state *gensec_gssapi_state)
  87 {
  88         OM_uint32 maj_stat, min_stat;
  89
  90         if (gensec_gssapi_state->lucid) {
  91                 return NT_STATUS_OK;
  92         }
  93
  94         maj_stat = gss_krb5_export_lucid_sec_context(&min_stat,
  95                                                      &gensec_gssapi_state->gssapi_context,
  96                                                      1,
  97                                                      (void **)&gensec_gssapi_state->lucid);
  98         if (maj_stat != GSS_S_COMPLETE) {
  99                 DEBUG(0,("gensec_gssapi_init_lucid: %s\n",
 100                         gssapi_error_string(gensec_gssapi_state,
 101                                             maj_stat, min_stat,
 102                                             gensec_gssapi_state->gss_oid)));
 103                 return NT_STATUS_INTERNAL_ERROR;
 104         }
 105
 106         if (gensec_gssapi_state->lucid->version != 1) {
 107                 DEBUG(0,("gensec_gssapi_init_lucid: lucid version[%d] != 1\n",
 108                         gensec_gssapi_state->lucid->version));
 109                 gss_krb5_free_lucid_sec_context(&min_stat, gensec_gssapi_state->lucid);
 110                 gensec_gssapi_state->lucid = NULL;
 111                 return NT_STATUS_INTERNAL_ERROR;
 112         }
 113
 114         return NT_STATUS_OK;
 115 }
 116
 117 static NTSTATUS gensec_gssapi_start(struct gensec_security *gensec_security)
 118 {
 119         struct gensec_gssapi_state *gensec_gssapi_state;
 120         krb5_error_code ret;
 121         const char *realm;
 122
 123         gensec_gssapi_state = talloc_zero(gensec_security, struct gensec_gssapi_state);
 124         if (!gensec_gssapi_state) {
 125                 return NT_STATUS_NO_MEMORY;
 126         }
 127
 128         gensec_security->private_data = gensec_gssapi_state;
 129
 130         gensec_gssapi_state->gssapi_context = GSS_C_NO_CONTEXT;
 131
 132         /* TODO: Fill in channel bindings */
 133         gensec_gssapi_state->input_chan_bindings = GSS_C_NO_CHANNEL_BINDINGS;
 134
 135         gensec_gssapi_state->server_name = GSS_C_NO_NAME;
 136         gensec_gssapi_state->client_name = GSS_C_NO_NAME;
 137
 138         gensec_gssapi_state->gss_want_flags = 0;
 139         gensec_gssapi_state->expire_time = GENSEC_EXPIRE_TIME_INFINITY;
 140
 141         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation_by_kdc_policy", true)) {
 142                 gensec_gssapi_state->gss_want_flags |= GSS_C_DELEG_POLICY_FLAG;
 143         }
 144         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "mutual", true)) {
 145                 gensec_gssapi_state->gss_want_flags |= GSS_C_MUTUAL_FLAG;
 146         }
 147         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation", true)) {
 148                 gensec_gssapi_state->gss_want_flags |= GSS_C_DELEG_FLAG;
 149         }
 150         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "replay", true)) {
 151                 gensec_gssapi_state->gss_want_flags |= GSS_C_REPLAY_FLAG;
 152         }
 153         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "sequence", true)) {
 154                 gensec_gssapi_state->gss_want_flags |= GSS_C_SEQUENCE_FLAG;
 155         }
 156
 157         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 158                 gensec_gssapi_state->gss_want_flags |= GSS_C_INTEG_FLAG;
 159         }
 160         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 161                 gensec_gssapi_state->gss_want_flags |= GSS_C_INTEG_FLAG;
 162                 gensec_gssapi_state->gss_want_flags |= GSS_C_CONF_FLAG;
 163         }
 164         if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
 165                 gensec_gssapi_state->gss_want_flags |= GSS_C_DCE_STYLE;
 166         }
 167
 168         gensec_gssapi_state->gss_got_flags = 0;
 169
 170         switch (gensec_security->ops->auth_type) {
 171         case DCERPC_AUTH_TYPE_SPNEGO:
 172                 gensec_gssapi_state->gss_oid = gss_mech_spnego;
 173                 break;
 174         case DCERPC_AUTH_TYPE_KRB5:
 175         default:
 176                 gensec_gssapi_state->gss_oid =
 177                         discard_const_p(void, gss_mech_krb5);
 178                 break;
 179         }
 180
 181         ret = smb_krb5_init_context(gensec_gssapi_state,
 182                                     NULL,
 183                                     gensec_security->settings->lp_ctx,
 184                                     &gensec_gssapi_state->smb_krb5_context);
 185         if (ret) {
 186                 DEBUG(1,("gensec_gssapi_start: smb_krb5_init_context failed (%s)\n",
 187                          error_message(ret)));
 188                 talloc_free(gensec_gssapi_state);
 189                 return NT_STATUS_INTERNAL_ERROR;
 190         }
 191
 192         gensec_gssapi_state->client_cred = NULL;
 193         gensec_gssapi_state->server_cred = NULL;
 194
 195         gensec_gssapi_state->lucid = NULL;
 196
 197         gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
 198
 199         gensec_gssapi_state->sasl = false;
 200         gensec_gssapi_state->sasl_state = STAGE_GSS_NEG;
 201         gensec_gssapi_state->sasl_protection = 0;
 202
 203         gensec_gssapi_state->max_wrap_buf_size
 204                 = gensec_setting_int(gensec_security->settings, "gensec_gssapi", "max wrap buf size", 65536);
 205         gensec_gssapi_state->gss_exchange_count = 0;
 206         gensec_gssapi_state->sig_size = 0;
 207
 208         talloc_set_destructor(gensec_gssapi_state, gensec_gssapi_destructor);
 209
 210 #ifdef SAMBA4_USES_HEIMDAL
 211         realm = lpcfg_realm(gensec_security->settings->lp_ctx);
 212         if (realm != NULL) {
 213                 ret = gsskrb5_set_default_realm(realm);
 214                 if (ret) {
 215                         DEBUG(1,("gensec_gssapi_start: gsskrb5_set_default_realm failed\n"));
 216                         talloc_free(gensec_gssapi_state);
 217                         return NT_STATUS_INTERNAL_ERROR;
 218                 }
 219         }
 220
 221         /* don't do DNS lookups of any kind, it might/will fail for a netbios name */
 222         ret = gsskrb5_set_dns_canonicalize(gensec_setting_bool(gensec_security->settings, "krb5", "set_dns_canonicalize", false));
 223         if (ret) {
 224                 DEBUG(1,("gensec_gssapi_start: gsskrb5_set_dns_canonicalize failed\n"));
 225                 talloc_free(gensec_gssapi_state);
 226                 return NT_STATUS_INTERNAL_ERROR;
 227         }
 228 #endif
 229         return NT_STATUS_OK;
 230 }
 231
 232 static NTSTATUS gensec_gssapi_server_start(struct gensec_security *gensec_security)
 233 {
 234         NTSTATUS nt_status;
 235         int ret;
 236         struct gensec_gssapi_state *gensec_gssapi_state;
 237         struct cli_credentials *machine_account;
 238         struct gssapi_creds_container *gcc;
 239
 240         nt_status = gensec_gssapi_start(gensec_security);
 241         if (!NT_STATUS_IS_OK(nt_status)) {
 242                 return nt_status;
 243         }
 244
 245         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 246
 247         machine_account = gensec_get_credentials(gensec_security);
 248
 249         if (!machine_account) {
 250                 DEBUG(3, ("No machine account credentials specified\n"));
 251                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 252         } else {
 253                 ret = cli_credentials_get_server_gss_creds(machine_account,
 254                                                            gensec_security->settings->lp_ctx, &gcc);
 255                 if (ret) {
 256                         DEBUG(1, ("Aquiring acceptor credentials failed: %s\n",
 257                                   error_message(ret)));
 258                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 259                 }
 260         }
 261
 262         gensec_gssapi_state->server_cred = gcc;
 263         return NT_STATUS_OK;
 264
 265 }
 266
 267 static NTSTATUS gensec_gssapi_sasl_server_start(struct gensec_security *gensec_security)
 268 {
 269         NTSTATUS nt_status;
 270         struct gensec_gssapi_state *gensec_gssapi_state;
 271         nt_status = gensec_gssapi_server_start(gensec_security);
 272
 273         if (NT_STATUS_IS_OK(nt_status)) {
 274                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 275                 gensec_gssapi_state->sasl = true;
 276         }
 277         return nt_status;
 278 }
 279
 280 static NTSTATUS gensec_gssapi_client_creds(struct gensec_security *gensec_security,
 281                                            struct tevent_context *ev)
 282 {
 283         struct gensec_gssapi_state *gensec_gssapi_state;
 284         struct gssapi_creds_container *gcc;
 285         struct cli_credentials *creds = gensec_get_credentials(gensec_security);
 286         const char *error_string;
 287         int ret;
 288
 289         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 290
 291         /* Only run this the first time the update() call is made */
 292         if (gensec_gssapi_state->client_cred) {
 293                 return NT_STATUS_OK;
 294         }
 295
 296         ret = cli_credentials_get_client_gss_creds(creds,
 297                                                    ev,
 298                                                    gensec_security->settings->lp_ctx, &gcc, &error_string);
 299         switch (ret) {
 300         case 0:
 301                 break;
 302         case EINVAL:
 303                 DEBUG(3, ("Cannot obtain client GSS credentials we need to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
 304                 return NT_STATUS_INVALID_PARAMETER;
 305         case KRB5KDC_ERR_PREAUTH_FAILED:
 306         case KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN:
 307                 DEBUG(1, ("Wrong username or password: %s\n", error_string));
 308                 return NT_STATUS_LOGON_FAILURE;
 309         case KRB5KDC_ERR_CLIENT_REVOKED:
 310                 DEBUG(1, ("Account locked out: %s\n", error_string));
 311                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 312         case KRB5_KDC_UNREACH:
 313                 DEBUG(3, ("Cannot reach a KDC we require to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
 314                 return NT_STATUS_NO_LOGON_SERVERS;
 315         case KRB5_CC_NOTFOUND:
 316         case KRB5_CC_END:
 317                 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));
 318                 return NT_STATUS_TIME_DIFFERENCE_AT_DC;
 319         default:
 320                 DEBUG(1, ("Aquiring initiator credentials failed: %s\n", error_string));
 321                 return NT_STATUS_UNSUCCESSFUL;
 322         }
 323
 324         gensec_gssapi_state->client_cred = gcc;
 325         if (!talloc_reference(gensec_gssapi_state, gcc)) {
 326                 return NT_STATUS_NO_MEMORY;
 327         }
 328
 329         return NT_STATUS_OK;
 330 }
 331
 332 static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_security)
 333 {
 334         struct gensec_gssapi_state *gensec_gssapi_state;
 335         struct cli_credentials *creds = gensec_get_credentials(gensec_security);
 336         NTSTATUS nt_status;
 337         gss_buffer_desc name_token;
 338         gss_OID name_type;
 339         OM_uint32 maj_stat, min_stat;
 340         const char *hostname = gensec_get_target_hostname(gensec_security);
 341
 342         if (!hostname) {
 343                 DEBUG(3, ("No hostname for target computer passed in, cannot use kerberos for this connection\n"));
 344                 return NT_STATUS_INVALID_PARAMETER;
 345         }
 346         if (is_ipaddress(hostname)) {
 347                 DEBUG(2, ("Cannot do GSSAPI to an IP address\n"));
 348                 return NT_STATUS_INVALID_PARAMETER;
 349         }
 350         if (strcmp(hostname, "localhost") == 0) {
 351                 DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
 352                 return NT_STATUS_INVALID_PARAMETER;
 353         }
 354
 355         nt_status = gensec_gssapi_start(gensec_security);
 356         if (!NT_STATUS_IS_OK(nt_status)) {
 357                 return nt_status;
 358         }
 359
 360         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 361
 362         if (cli_credentials_get_impersonate_principal(creds)) {
 363                 gensec_gssapi_state->gss_want_flags &= ~(GSS_C_DELEG_FLAG|GSS_C_DELEG_POLICY_FLAG);
 364         }
 365
 366         gensec_gssapi_state->target_principal = gensec_get_target_principal(gensec_security);
 367         if (gensec_gssapi_state->target_principal) {
 368                 name_type = GSS_C_NULL_OID;
 369         } else {
 370                 gensec_gssapi_state->target_principal = talloc_asprintf(gensec_gssapi_state, "%s/%s@%s",
 371                                             gensec_get_target_service(gensec_security),
 372                                             hostname, lpcfg_realm(gensec_security->settings->lp_ctx));
 373
 374                 name_type = GSS_C_NT_USER_NAME;
 375         }
 376         name_token.value  = discard_const_p(uint8_t, gensec_gssapi_state->target_principal);
 377         name_token.length = strlen(gensec_gssapi_state->target_principal);
 378
 379
 380         maj_stat = gss_import_name (&min_stat,
 381                                     &name_token,
 382                                     name_type,
 383                                     &gensec_gssapi_state->server_name);
 384         if (maj_stat) {
 385                 DEBUG(2, ("GSS Import name of %s failed: %s\n",
 386                           (char *)name_token.value,
 387                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 388                 return NT_STATUS_INVALID_PARAMETER;
 389         }
 390
 391         return NT_STATUS_OK;
 392 }
 393
 394 static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
 395 {
 396         NTSTATUS nt_status;
 397         struct gensec_gssapi_state *gensec_gssapi_state;
 398         nt_status = gensec_gssapi_client_start(gensec_security);
 399
 400         if (NT_STATUS_IS_OK(nt_status)) {
 401                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 402                 gensec_gssapi_state->sasl = true;
 403         }
 404         return nt_status;
 405 }
 406
 407
 408 /**
 409  * Next state function for the GSSAPI GENSEC mechanism
 410  *
 411  * @param gensec_gssapi_state GSSAPI State
 412  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 413  * @param in The request, as a DATA_BLOB
 414  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 415  * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
 416  *                or NT_STATUS_OK if the user is authenticated.
 417  */
 418
 419 static NTSTATUS gensec_gssapi_update(struct gensec_security *gensec_security,
 420                                      TALLOC_CTX *out_mem_ctx,
 421                                      struct tevent_context *ev,
 422                                      const DATA_BLOB in, DATA_BLOB *out)
 423 {
 424         struct gensec_gssapi_state *gensec_gssapi_state
 425                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 426         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 427         OM_uint32 maj_stat, min_stat;
 428         OM_uint32 min_stat2;
 429         gss_buffer_desc input_token, output_token;
 430         gss_OID gss_oid_p = NULL;
 431         OM_uint32 time_req = 0;
 432         OM_uint32 time_rec = 0;
 433         struct timeval tv;
 434
 435         time_req = gensec_setting_int(gensec_security->settings,
 436                                       "gensec_gssapi", "requested_life_time",
 437                                       time_req);
 438
 439         input_token.length = in.length;
 440         input_token.value = in.data;
 441
 442         switch (gensec_gssapi_state->sasl_state) {
 443         case STAGE_GSS_NEG:
 444         {
 445                 switch (gensec_security->gensec_role) {
 446                 case GENSEC_CLIENT:
 447                 {
 448 #ifdef SAMBA4_USES_HEIMDAL
 449                         struct gsskrb5_send_to_kdc send_to_kdc;
 450 #endif
 451                         krb5_error_code ret;
 452
 453                         nt_status = gensec_gssapi_client_creds(gensec_security, ev);
 454                         if (!NT_STATUS_IS_OK(nt_status)) {
 455                                 return nt_status;
 456                         }
 457
 458 #ifdef SAMBA4_USES_HEIMDAL
 459                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 460                         send_to_kdc.ptr = ev;
 461
 462                         min_stat = gsskrb5_set_send_to_kdc(&send_to_kdc);
 463                         if (min_stat) {
 464                                 DEBUG(1,("gensec_gssapi_update: gsskrb5_set_send_to_kdc failed\n"));
 465                                 return NT_STATUS_INTERNAL_ERROR;
 466                         }
 467 #endif
 468                         maj_stat = gss_init_sec_context(&min_stat,
 469                                                         gensec_gssapi_state->client_cred->creds,
 470                                                         &gensec_gssapi_state->gssapi_context,
 471                                                         gensec_gssapi_state->server_name,
 472                                                         gensec_gssapi_state->gss_oid,
 473                                                         gensec_gssapi_state->gss_want_flags,
 474                                                         time_req,
 475                                                         gensec_gssapi_state->input_chan_bindings,
 476                                                         &input_token,
 477                                                         &gss_oid_p,
 478                                                         &output_token,
 479                                                         &gensec_gssapi_state->gss_got_flags, /* ret flags */
 480                                                         &time_rec);
 481                         if (gss_oid_p) {
 482                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 483                         }
 484
 485 #ifdef SAMBA4_USES_HEIMDAL
 486                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 487                         send_to_kdc.ptr = NULL;
 488
 489                         ret = gsskrb5_set_send_to_kdc(&send_to_kdc);
 490                         if (ret) {
 491                                 DEBUG(1,("gensec_gssapi_update: gsskrb5_set_send_to_kdc failed\n"));
 492                                 return NT_STATUS_INTERNAL_ERROR;
 493                         }
 494 #endif
 495                         break;
 496                 }
 497                 case GENSEC_SERVER:
 498                 {
 499                         maj_stat = gss_accept_sec_context(&min_stat,
 500                                                           &gensec_gssapi_state->gssapi_context,
 501                                                           gensec_gssapi_state->server_cred->creds,
 502                                                           &input_token,
 503                                                           gensec_gssapi_state->input_chan_bindings,
 504                                                           &gensec_gssapi_state->client_name,
 505                                                           &gss_oid_p,
 506                                                           &output_token,
 507                                                           &gensec_gssapi_state->gss_got_flags,
 508                                                           &time_rec,
 509                                                           &gensec_gssapi_state->delegated_cred_handle);
 510                         if (gss_oid_p) {
 511                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 512                         }
 513                         break;
 514                 }
 515                 default:
 516                         return NT_STATUS_INVALID_PARAMETER;
 517
 518                 }
 519
 520                 gensec_gssapi_state->gss_exchange_count++;
 521
 522                 if (maj_stat == GSS_S_COMPLETE) {
 523                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 524                         gss_release_buffer(&min_stat2, &output_token);
 525
 526                         if (gensec_gssapi_state->gss_got_flags & GSS_C_DELEG_FLAG) {
 527                                 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
 528                         } else {
 529                                 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
 530                         }
 531
 532                         tv = timeval_current_ofs(time_rec, 0);
 533                         gensec_gssapi_state->expire_time = timeval_to_nttime(&tv);
 534
 535                         /* We may have been invoked as SASL, so there
 536                          * is more work to do */
 537                         if (gensec_gssapi_state->sasl) {
 538                                 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
 539                                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 540                         } else {
 541                                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 542
 543                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 544                                         DEBUG(5, ("GSSAPI Connection will be cryptographically sealed\n"));
 545                                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 546                                         DEBUG(5, ("GSSAPI Connection will be cryptographically signed\n"));
 547                                 } else {
 548                                         DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
 549                                 }
 550
 551                                 return NT_STATUS_OK;
 552                         }
 553                 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
 554                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 555                         gss_release_buffer(&min_stat2, &output_token);
 556
 557                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 558                 } else if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
 559                         gss_cred_id_t creds;
 560                         gss_name_t name;
 561                         gss_buffer_desc buffer;
 562                         OM_uint32 lifetime = 0;
 563                         gss_cred_usage_t usage;
 564                         const char *role = NULL;
 565                         DEBUG(0, ("GSS %s Update(krb5)(%d) Update failed, credentials expired during GSSAPI handshake!\n",
 566                                   role,
 567                                   gensec_gssapi_state->gss_exchange_count));
 568
 569
 570                         switch (gensec_security->gensec_role) {
 571                         case GENSEC_CLIENT:
 572                                 creds = gensec_gssapi_state->client_cred->creds;
 573                                 role = "client";
 574                                 break;
 575                         case GENSEC_SERVER:
 576                                 creds = gensec_gssapi_state->server_cred->creds;
 577                                 role = "server";
 578                                 break;
 579                         }
 580
 581                         maj_stat = gss_inquire_cred(&min_stat,
 582                                                     creds,
 583                                                     &name, &lifetime, &usage, NULL);
 584
 585                         if (maj_stat == GSS_S_COMPLETE) {
 586                                 const char *usage_string;
 587                                 switch (usage) {
 588                                 case GSS_C_BOTH:
 589                                         usage_string = "GSS_C_BOTH";
 590                                         break;
 591                                 case GSS_C_ACCEPT:
 592                                         usage_string = "GSS_C_ACCEPT";
 593                                         break;
 594                                 case GSS_C_INITIATE:
 595                                         usage_string = "GSS_C_INITIATE";
 596                                         break;
 597                                 }
 598                                 maj_stat = gss_display_name(&min_stat, name, &buffer, NULL);
 599                                 if (maj_stat) {
 600                                         buffer.value = NULL;
 601                                         buffer.length = 0;
 602                                 }
 603                                 if (lifetime > 0) {
 604                                         DEBUG(0, ("GSSAPI gss_inquire_cred indicates expiry of %*.*s in %u sec for %s\n",
 605                                                   (int)buffer.length, (int)buffer.length, (char *)buffer.value,
 606                                                   lifetime, usage_string));
 607                                 } else {
 608                                         DEBUG(0, ("GSSAPI gss_inquire_cred indicates %*.*s has already expired for %s\n",
 609                                                   (int)buffer.length, (int)buffer.length, (char *)buffer.value,
 610                                                   usage_string));
 611                                 }
 612                                 gss_release_buffer(&min_stat, &buffer);
 613                                 gss_release_name(&min_stat, &name);
 614                         } else if (maj_stat != GSS_S_COMPLETE) {
 615                                 DEBUG(0, ("inquiry of credential lifefime via GSSAPI gss_inquire_cred failed: %s\n",
 616                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 617                         }
 618                         return NT_STATUS_INVALID_PARAMETER;
 619                 } else if (smb_gss_oid_equal(gensec_gssapi_state->gss_oid,
 620                                              gss_mech_krb5)) {
 621                         switch (min_stat) {
 622                         case KRB5KRB_AP_ERR_TKT_NYV:
 623                                 DEBUG(1, ("Error with ticket to contact %s: possible clock skew between us and the KDC or target server: %s\n",
 624                                           gensec_gssapi_state->target_principal,
 625                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 626                                 return NT_STATUS_TIME_DIFFERENCE_AT_DC; /* Make SPNEGO ignore us, we can't go any further here */
 627                         case KRB5KRB_AP_ERR_TKT_EXPIRED:
 628                                 DEBUG(1, ("Error with ticket to contact %s: ticket is expired, possible clock skew between us and the KDC or target server: %s\n",
 629                                           gensec_gssapi_state->target_principal,
 630                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 631                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 632                         case KRB5_KDC_UNREACH:
 633                                 DEBUG(3, ("Cannot reach a KDC we require in order to obtain a ticetk to %s: %s\n",
 634                                           gensec_gssapi_state->target_principal,
 635                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 636                                 return NT_STATUS_NO_LOGON_SERVERS; /* Make SPNEGO ignore us, we can't go any further here */
 637                         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 638                                 DEBUG(3, ("Server %s is not registered with our KDC: %s\n",
 639                                           gensec_gssapi_state->target_principal,
 640                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 641                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 642                         case KRB5KRB_AP_ERR_MSG_TYPE:
 643                                 /* garbage input, possibly from the auto-mech detection */
 644                                 return NT_STATUS_INVALID_PARAMETER;
 645                         default:
 646                                 DEBUG(1, ("GSS %s Update(krb5)(%d) Update failed: %s\n",
 647                                           gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 648                                           gensec_gssapi_state->gss_exchange_count,
 649                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 650                                 return nt_status;
 651                         }
 652                 } else {
 653                         DEBUG(1, ("GSS %s Update(%d) failed: %s\n",
 654                                   gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 655                                   gensec_gssapi_state->gss_exchange_count,
 656                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 657                         return nt_status;
 658                 }
 659                 break;
 660         }
 661
 662         /* These last two stages are only done if we were invoked as SASL */
 663         case STAGE_SASL_SSF_NEG:
 664         {
 665                 switch (gensec_security->gensec_role) {
 666                 case GENSEC_CLIENT:
 667                 {
 668                         uint8_t maxlength_proposed[4];
 669                         uint8_t maxlength_accepted[4];
 670                         uint8_t security_supported;
 671                         int conf_state;
 672                         gss_qop_t qop_state;
 673                         input_token.length = in.length;
 674                         input_token.value = in.data;
 675
 676                         /* As a client, we have just send a
 677                          * zero-length blob to the server (after the
 678                          * normal GSSAPI exchange), and it has replied
 679                          * with it's SASL negotiation */
 680
 681                         maj_stat = gss_unwrap(&min_stat,
 682                                               gensec_gssapi_state->gssapi_context,
 683                                               &input_token,
 684                                               &output_token,
 685                                               &conf_state,
 686                                               &qop_state);
 687                         if (GSS_ERROR(maj_stat)) {
 688                                 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 689                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 690                                 return NT_STATUS_ACCESS_DENIED;
 691                         }
 692
 693                         if (output_token.length < 4) {
 694                                 return NT_STATUS_INVALID_PARAMETER;
 695                         }
 696
 697                         memcpy(maxlength_proposed, output_token.value, 4);
 698                         gss_release_buffer(&min_stat, &output_token);
 699
 700                         /* first byte is the proposed security */
 701                         security_supported = maxlength_proposed[0];
 702                         maxlength_proposed[0] = '\0';
 703
 704                         /* Rest is the proposed max wrap length */
 705                         gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
 706                                                                      gensec_gssapi_state->max_wrap_buf_size);
 707                         gensec_gssapi_state->sasl_protection = 0;
 708                         if (security_supported & NEG_SEAL) {
 709                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 710                                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 711                                 }
 712                         }
 713                         if (security_supported & NEG_SIGN) {
 714                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 715                                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 716                                 }
 717                         }
 718                         if (security_supported & NEG_NONE) {
 719                                 gensec_gssapi_state->sasl_protection |= NEG_NONE;
 720                         }
 721                         if (gensec_gssapi_state->sasl_protection == 0) {
 722                                 DEBUG(1, ("Remote server does not support unprotected connections\n"));
 723                                 return NT_STATUS_ACCESS_DENIED;
 724                         }
 725
 726                         /* Send back the negotiated max length */
 727
 728                         RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
 729
 730                         maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
 731
 732                         input_token.value = maxlength_accepted;
 733                         input_token.length = sizeof(maxlength_accepted);
 734
 735                         maj_stat = gss_wrap(&min_stat,
 736                                             gensec_gssapi_state->gssapi_context,
 737                                             false,
 738                                             GSS_C_QOP_DEFAULT,
 739                                             &input_token,
 740                                             &conf_state,
 741                                             &output_token);
 742                         if (GSS_ERROR(maj_stat)) {
 743                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 744                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 745                                 return NT_STATUS_ACCESS_DENIED;
 746                         }
 747
 748                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 749                         gss_release_buffer(&min_stat, &output_token);
 750
 751                         /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 752                         gensec_gssapi_state->sasl_state = STAGE_DONE;
 753
 754                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 755                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically sealed\n"));
 756                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 757                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically signed\n"));
 758                         } else {
 759                                 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographically protection\n"));
 760                         }
 761
 762                         return NT_STATUS_OK;
 763                 }
 764                 case GENSEC_SERVER:
 765                 {
 766                         uint8_t maxlength_proposed[4];
 767                         uint8_t security_supported = 0x0;
 768                         int conf_state;
 769
 770                         /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
 771                         if (in.length != 0) {
 772                                 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
 773                         }
 774
 775                         /* Give the client some idea what we will support */
 776
 777                         RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
 778                         /* first byte is the proposed security */
 779                         maxlength_proposed[0] = '\0';
 780
 781                         gensec_gssapi_state->sasl_protection = 0;
 782                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 783                                 security_supported |= NEG_SEAL;
 784                         }
 785                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 786                                 security_supported |= NEG_SIGN;
 787                         }
 788                         if (security_supported == 0) {
 789                                 /* If we don't support anything, this must be 0 */
 790                                 RSIVAL(maxlength_proposed, 0, 0x0);
 791                         }
 792
 793                         /* TODO:  We may not wish to support this */
 794                         security_supported |= NEG_NONE;
 795                         maxlength_proposed[0] = security_supported;
 796
 797                         input_token.value = maxlength_proposed;
 798                         input_token.length = sizeof(maxlength_proposed);
 799
 800                         maj_stat = gss_wrap(&min_stat,
 801                                             gensec_gssapi_state->gssapi_context,
 802                                             false,
 803                                             GSS_C_QOP_DEFAULT,
 804                                             &input_token,
 805                                             &conf_state,
 806                                             &output_token);
 807                         if (GSS_ERROR(maj_stat)) {
 808                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 809                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 810                                 return NT_STATUS_ACCESS_DENIED;
 811                         }
 812
 813                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 814                         gss_release_buffer(&min_stat, &output_token);
 815
 816                         gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
 817                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 818                 }
 819                 default:
 820                         return NT_STATUS_INVALID_PARAMETER;
 821
 822                 }
 823         }
 824         /* This is s server-only stage */
 825         case STAGE_SASL_SSF_ACCEPT:
 826         {
 827                 uint8_t maxlength_accepted[4];
 828                 uint8_t security_accepted;
 829                 int conf_state;
 830                 gss_qop_t qop_state;
 831                 input_token.length = in.length;
 832                 input_token.value = in.data;
 833
 834                 maj_stat = gss_unwrap(&min_stat,
 835                                       gensec_gssapi_state->gssapi_context,
 836                                       &input_token,
 837                                       &output_token,
 838                                       &conf_state,
 839                                       &qop_state);
 840                 if (GSS_ERROR(maj_stat)) {
 841                         DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 842                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 843                         return NT_STATUS_ACCESS_DENIED;
 844                 }
 845
 846                 if (output_token.length < 4) {
 847                         return NT_STATUS_INVALID_PARAMETER;
 848                 }
 849
 850                 memcpy(maxlength_accepted, output_token.value, 4);
 851                 gss_release_buffer(&min_stat, &output_token);
 852
 853                 /* first byte is the proposed security */
 854                 security_accepted = maxlength_accepted[0];
 855                 maxlength_accepted[0] = '\0';
 856
 857                 /* Rest is the proposed max wrap length */
 858                 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
 859                                                              gensec_gssapi_state->max_wrap_buf_size);
 860
 861                 gensec_gssapi_state->sasl_protection = 0;
 862                 if (security_accepted & NEG_SEAL) {
 863                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 864                                 DEBUG(1, ("Remote client wanted seal, but gensec refused\n"));
 865                                 return NT_STATUS_ACCESS_DENIED;
 866                         }
 867                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 868                 }
 869                 if (security_accepted & NEG_SIGN) {
 870                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 871                                 DEBUG(1, ("Remote client wanted sign, but gensec refused\n"));
 872                                 return NT_STATUS_ACCESS_DENIED;
 873                         }
 874                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 875                 }
 876                 if (security_accepted & NEG_NONE) {
 877                         gensec_gssapi_state->sasl_protection |= NEG_NONE;
 878                 }
 879
 880                 /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 881                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 882                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 883                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically sealed\n"));
 884                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 885                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically signed\n"));
 886                 } else {
 887                         DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
 888                 }
 889
 890                 *out = data_blob(NULL, 0);
 891                 return NT_STATUS_OK;
 892         }
 893         default:
 894                 return NT_STATUS_INVALID_PARAMETER;
 895         }
 896 }
 897
 898 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
 899                                    TALLOC_CTX *mem_ctx,
 900                                    const DATA_BLOB *in,
 901                                    DATA_BLOB *out)
 902 {
 903         struct gensec_gssapi_state *gensec_gssapi_state
 904                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 905         OM_uint32 maj_stat, min_stat;
 906         gss_buffer_desc input_token, output_token;
 907         int conf_state;
 908         input_token.length = in->length;
 909         input_token.value = in->data;
 910
 911         maj_stat = gss_wrap(&min_stat,
 912                             gensec_gssapi_state->gssapi_context,
 913                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 914                             GSS_C_QOP_DEFAULT,
 915                             &input_token,
 916                             &conf_state,
 917                             &output_token);
 918         if (GSS_ERROR(maj_stat)) {
 919                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 920                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 921                 return NT_STATUS_ACCESS_DENIED;
 922         }
 923
 924         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 925         gss_release_buffer(&min_stat, &output_token);
 926
 927         if (gensec_gssapi_state->sasl) {
 928                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 929                 if (max_wrapped_size < out->length) {
 930                         DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
 931                                   (unsigned)in->length,
 932                                   (unsigned)out->length,
 933                                   (unsigned int)max_wrapped_size));
 934                         return NT_STATUS_INVALID_PARAMETER;
 935                 }
 936         }
 937
 938         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 939             && !conf_state) {
 940                 return NT_STATUS_ACCESS_DENIED;
 941         }
 942         return NT_STATUS_OK;
 943 }
 944
 945 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
 946                                      TALLOC_CTX *mem_ctx,
 947                                      const DATA_BLOB *in,
 948                                      DATA_BLOB *out)
 949 {
 950         struct gensec_gssapi_state *gensec_gssapi_state
 951                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 952         OM_uint32 maj_stat, min_stat;
 953         gss_buffer_desc input_token, output_token;
 954         int conf_state;
 955         gss_qop_t qop_state;
 956         input_token.length = in->length;
 957         input_token.value = in->data;
 958
 959         if (gensec_gssapi_state->sasl) {
 960                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 961                 if (max_wrapped_size < in->length) {
 962                         DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
 963                         return NT_STATUS_INVALID_PARAMETER;
 964                 }
 965         }
 966
 967         maj_stat = gss_unwrap(&min_stat,
 968                               gensec_gssapi_state->gssapi_context,
 969                               &input_token,
 970                               &output_token,
 971                               &conf_state,
 972                               &qop_state);
 973         if (GSS_ERROR(maj_stat)) {
 974                 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
 975                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 976                 return NT_STATUS_ACCESS_DENIED;
 977         }
 978
 979         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 980         gss_release_buffer(&min_stat, &output_token);
 981
 982         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 983             && !conf_state) {
 984                 return NT_STATUS_ACCESS_DENIED;
 985         }
 986         return NT_STATUS_OK;
 987 }
 988
 989 /* Find out the maximum input size negotiated on this connection */
 990
 991 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
 992 {
 993         struct gensec_gssapi_state *gensec_gssapi_state
 994                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 995         OM_uint32 maj_stat, min_stat;
 996         OM_uint32 max_input_size;
 997
 998         maj_stat = gss_wrap_size_limit(&min_stat,
 999                                        gensec_gssapi_state->gssapi_context,
1000                                        gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
1001                                        GSS_C_QOP_DEFAULT,
1002                                        gensec_gssapi_state->max_wrap_buf_size,
1003                                        &max_input_size);
1004         if (GSS_ERROR(maj_stat)) {
1005                 TALLOC_CTX *mem_ctx = talloc_new(NULL);
1006                 DEBUG(1, ("gensec_gssapi_max_input_size: determining signature size with gss_wrap_size_limit failed: %s\n",
1007                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1008                 talloc_free(mem_ctx);
1009                 return 0;
1010         }
1011
1012         return max_input_size;
1013 }
1014
1015 /* Find out the maximum output size negotiated on this connection */
1016 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
1017 {
1018         struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
1019         return gensec_gssapi_state->max_wrap_buf_size;
1020 }
1021
1022 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
1023                                           TALLOC_CTX *mem_ctx,
1024                                           uint8_t *data, size_t length,
1025                                           const uint8_t *whole_pdu, size_t pdu_length,
1026                                           DATA_BLOB *sig)
1027 {
1028         struct gensec_gssapi_state *gensec_gssapi_state
1029                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1030         OM_uint32 maj_stat, min_stat;
1031         gss_buffer_desc input_token, output_token;
1032         int conf_state;
1033         ssize_t sig_length;
1034
1035         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1036                 DEBUG(1, ("gensec_gssapi_seal_packet: "
1037                           "GENSEC_FEATURE_SIGN_PKT_HEADER not supported\n"));
1038                 return NT_STATUS_ACCESS_DENIED;
1039         }
1040
1041         input_token.length = length;
1042         input_token.value = data;
1043
1044         maj_stat = gss_wrap(&min_stat,
1045                             gensec_gssapi_state->gssapi_context,
1046                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
1047                             GSS_C_QOP_DEFAULT,
1048                             &input_token,
1049                             &conf_state,
1050                             &output_token);
1051         if (GSS_ERROR(maj_stat)) {
1052                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
1053                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1054                 return NT_STATUS_ACCESS_DENIED;
1055         }
1056
1057         if (output_token.length < input_token.length) {
1058                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
1059                           (long)output_token.length, (long)length));
1060                 return NT_STATUS_INTERNAL_ERROR;
1061         }
1062         sig_length = output_token.length - input_token.length;
1063
1064         memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
1065         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
1066
1067         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1068         dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
1069         dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
1070
1071         gss_release_buffer(&min_stat, &output_token);
1072
1073         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1074             && !conf_state) {
1075                 return NT_STATUS_ACCESS_DENIED;
1076         }
1077         return NT_STATUS_OK;
1078 }
1079
1080 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
1081                                             uint8_t *data, size_t length,
1082                                             const uint8_t *whole_pdu, size_t pdu_length,
1083                                             const DATA_BLOB *sig)
1084 {
1085         struct gensec_gssapi_state *gensec_gssapi_state
1086                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1087         OM_uint32 maj_stat, min_stat;
1088         gss_buffer_desc input_token, output_token;
1089         int conf_state;
1090         gss_qop_t qop_state;
1091         DATA_BLOB in;
1092
1093         dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
1094
1095         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1096                 DEBUG(1, ("gensec_gssapi_unseal_packet: "
1097                           "GENSEC_FEATURE_SIGN_PKT_HEADER not supported\n"));
1098                 return NT_STATUS_ACCESS_DENIED;
1099         }
1100
1101         in = data_blob_talloc(gensec_security, NULL, sig->length + length);
1102
1103         memcpy(in.data, sig->data, sig->length);
1104         memcpy(in.data + sig->length, data, length);
1105
1106         input_token.length = in.length;
1107         input_token.value = in.data;
1108
1109         maj_stat = gss_unwrap(&min_stat,
1110                               gensec_gssapi_state->gssapi_context,
1111                               &input_token,
1112                               &output_token,
1113                               &conf_state,
1114                               &qop_state);
1115         talloc_free(in.data);
1116         if (GSS_ERROR(maj_stat)) {
1117                 char *error_string = gssapi_error_string(NULL, maj_stat, min_stat, gensec_gssapi_state->gss_oid);
1118                 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
1119                           error_string));
1120                 talloc_free(error_string);
1121                 return NT_STATUS_ACCESS_DENIED;
1122         }
1123
1124         if (output_token.length != length) {
1125                 return NT_STATUS_INTERNAL_ERROR;
1126         }
1127
1128         memcpy(data, output_token.value, length);
1129
1130         gss_release_buffer(&min_stat, &output_token);
1131
1132         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1133             && !conf_state) {
1134                 return NT_STATUS_ACCESS_DENIED;
1135         }
1136         return NT_STATUS_OK;
1137 }
1138
1139 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1140                                           TALLOC_CTX *mem_ctx,
1141                                           const uint8_t *data, size_t length,
1142                                           const uint8_t *whole_pdu, size_t pdu_length,
1143                                           DATA_BLOB *sig)
1144 {
1145         struct gensec_gssapi_state *gensec_gssapi_state
1146                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1147         OM_uint32 maj_stat, min_stat;
1148         gss_buffer_desc input_token, output_token;
1149
1150         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1151                 input_token.length = pdu_length;
1152                 input_token.value = discard_const_p(uint8_t *, whole_pdu);
1153         } else {
1154                 input_token.length = length;
1155                 input_token.value = discard_const_p(uint8_t *, data);
1156         }
1157
1158         maj_stat = gss_get_mic(&min_stat,
1159                             gensec_gssapi_state->gssapi_context,
1160                             GSS_C_QOP_DEFAULT,
1161                             &input_token,
1162                             &output_token);
1163         if (GSS_ERROR(maj_stat)) {
1164                 DEBUG(1, ("GSS GetMic failed: %s\n",
1165                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1166                 return NT_STATUS_ACCESS_DENIED;
1167         }
1168
1169         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, output_token.length);
1170
1171         dump_data_pw("gensec_gssapi_sign_packet: sig\n", sig->data, sig->length);
1172
1173         gss_release_buffer(&min_stat, &output_token);
1174
1175         return NT_STATUS_OK;
1176 }
1177
1178 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1179                                            const uint8_t *data, size_t length,
1180                                            const uint8_t *whole_pdu, size_t pdu_length,
1181                                            const DATA_BLOB *sig)
1182 {
1183         struct gensec_gssapi_state *gensec_gssapi_state
1184                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1185         OM_uint32 maj_stat, min_stat;
1186         gss_buffer_desc input_token;
1187         gss_buffer_desc input_message;
1188         gss_qop_t qop_state;
1189
1190         dump_data_pw("gensec_gssapi_check_packet: sig\n", sig->data, sig->length);
1191
1192         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1193                 input_message.length = pdu_length;
1194                 input_message.value = discard_const(whole_pdu);
1195         } else {
1196                 input_message.length = length;
1197                 input_message.value = discard_const(data);
1198         }
1199
1200         input_token.length = sig->length;
1201         input_token.value = sig->data;
1202
1203         maj_stat = gss_verify_mic(&min_stat,
1204                               gensec_gssapi_state->gssapi_context,
1205                               &input_message,
1206                               &input_token,
1207                               &qop_state);
1208         if (GSS_ERROR(maj_stat)) {
1209                 char *error_string = gssapi_error_string(NULL, maj_stat, min_stat, gensec_gssapi_state->gss_oid);
1210                 DEBUG(1, ("GSS VerifyMic failed: %s\n", error_string));
1211                 talloc_free(error_string);
1212
1213                 return NT_STATUS_ACCESS_DENIED;
1214         }
1215
1216         return NT_STATUS_OK;
1217 }
1218
1219 /* Try to figure out what features we actually got on the connection */
1220 static bool gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1221                                        uint32_t feature)
1222 {
1223         struct gensec_gssapi_state *gensec_gssapi_state
1224                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1225         if (feature & GENSEC_FEATURE_SIGN) {
1226                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1227                 if (gensec_gssapi_state->sasl
1228                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1229                         return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1230                                 && (gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG));
1231                 }
1232                 return gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG;
1233         }
1234         if (feature & GENSEC_FEATURE_SEAL) {
1235                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1236                 if (gensec_gssapi_state->sasl
1237                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1238                         return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1239                                  && (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG));
1240                 }
1241                 return gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG;
1242         }
1243         if (feature & GENSEC_FEATURE_SESSION_KEY) {
1244                 /* Only for GSSAPI/Krb5 */
1245                 if (smb_gss_oid_equal(gensec_gssapi_state->gss_oid,
1246                                       gss_mech_krb5)) {
1247                         return true;
1248                 }
1249         }
1250         if (feature & GENSEC_FEATURE_DCE_STYLE) {
1251                 return gensec_gssapi_state->gss_got_flags & GSS_C_DCE_STYLE;
1252         }
1253         if (feature & GENSEC_FEATURE_NEW_SPNEGO) {
1254                 NTSTATUS status;
1255                 uint32_t keytype;
1256
1257                 if (!(gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG)) {
1258                         return false;
1259                 }
1260
1261                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "force_new_spnego", false)) {
1262                         return true;
1263                 }
1264                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "disable_new_spnego", false)) {
1265                         return false;
1266                 }
1267
1268                 status = gssapi_get_session_key(gensec_gssapi_state,
1269                                                 gensec_gssapi_state->gssapi_context, NULL, &keytype);
1270                 /*
1271                  * We should do a proper sig on the mechListMic unless
1272                  * we know we have to be backwards compatible with
1273                  * earlier windows versions.
1274                  *
1275                  * Negotiating a non-krb5
1276                  * mech for example should be regarded as having
1277                  * NEW_SPNEGO
1278                  */
1279                 if (NT_STATUS_IS_OK(status)) {
1280                         switch (keytype) {
1281                         case ENCTYPE_DES_CBC_CRC:
1282                         case ENCTYPE_DES_CBC_MD5:
1283                         case ENCTYPE_ARCFOUR_HMAC:
1284                         case ENCTYPE_DES3_CBC_SHA1:
1285                                 return false;
1286                         }
1287                 }
1288                 return true;
1289         }
1290         /* We can always do async (rather than strict request/reply) packets.  */
1291         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1292                 return true;
1293         }
1294         if (feature & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1295                 if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
1296                         /* TODO: implement this using gss_wrap_iov() */
1297                         return false;
1298                 }
1299
1300                 if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
1301                         return true;
1302                 }
1303
1304                 return false;
1305         }
1306         return false;
1307 }
1308
1309 static NTTIME gensec_gssapi_expire_time(struct gensec_security *gensec_security)
1310 {
1311         struct gensec_gssapi_state *gensec_gssapi_state =
1312                 talloc_get_type_abort(gensec_security->private_data,
1313                 struct gensec_gssapi_state);
1314
1315         return gensec_gssapi_state->expire_time;
1316 }
1317
1318 /*
1319  * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1320  * (for encrypting some passwords).
1321  *
1322  * This breaks all the abstractions, but what do you expect...
1323  */
1324 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1325                                           TALLOC_CTX *mem_ctx,
1326                                           DATA_BLOB *session_key)
1327 {
1328         struct gensec_gssapi_state *gensec_gssapi_state
1329                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1330         return gssapi_get_session_key(mem_ctx, gensec_gssapi_state->gssapi_context, session_key, NULL);
1331 }
1332
1333 /* Get some basic (and authorization) information about the user on
1334  * this session.  This uses either the PAC (if present) or a local
1335  * database lookup */
1336 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1337                                            TALLOC_CTX *mem_ctx,
1338                                            struct auth_session_info **_session_info)
1339 {
1340         NTSTATUS nt_status;
1341         TALLOC_CTX *tmp_ctx;
1342         struct gensec_gssapi_state *gensec_gssapi_state
1343                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1344         struct auth_session_info *session_info = NULL;
1345         OM_uint32 maj_stat, min_stat;
1346         DATA_BLOB pac_blob, *pac_blob_ptr = NULL;
1347
1348         gss_buffer_desc name_token;
1349         char *principal_string;
1350
1351         tmp_ctx = talloc_named(mem_ctx, 0, "gensec_gssapi_session_info context");
1352         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
1353
1354         maj_stat = gss_display_name (&min_stat,
1355                                      gensec_gssapi_state->client_name,
1356                                      &name_token,
1357                                      NULL);
1358         if (GSS_ERROR(maj_stat)) {
1359                 DEBUG(1, ("GSS display_name failed: %s\n",
1360                           gssapi_error_string(tmp_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1361                 talloc_free(tmp_ctx);
1362                 return NT_STATUS_FOOBAR;
1363         }
1364
1365         principal_string = talloc_strndup(tmp_ctx,
1366                                           (const char *)name_token.value,
1367                                           name_token.length);
1368
1369         gss_release_buffer(&min_stat, &name_token);
1370
1371         if (!principal_string) {
1372                 talloc_free(tmp_ctx);
1373                 return NT_STATUS_NO_MEMORY;
1374         }
1375
1376         nt_status = gssapi_obtain_pac_blob(tmp_ctx,  gensec_gssapi_state->gssapi_context,
1377                                            gensec_gssapi_state->client_name,
1378                                            &pac_blob);
1379
1380         /* IF we have the PAC - otherwise we need to get this
1381          * data from elsewere - local ldb, or (TODO) lookup of some
1382          * kind...
1383          */
1384         if (NT_STATUS_IS_OK(nt_status)) {
1385                 pac_blob_ptr = &pac_blob;
1386         }
1387         nt_status = gensec_generate_session_info_pac(tmp_ctx,
1388                                                      gensec_security,
1389                                                      gensec_gssapi_state->smb_krb5_context,
1390                                                      pac_blob_ptr, principal_string,
1391                                                      gensec_get_remote_address(gensec_security),
1392                                                      &session_info);
1393         if (!NT_STATUS_IS_OK(nt_status)) {
1394                 talloc_free(tmp_ctx);
1395                 return nt_status;
1396         }
1397
1398         nt_status = gensec_gssapi_session_key(gensec_security, session_info, &session_info->session_key);
1399         if (!NT_STATUS_IS_OK(nt_status)) {
1400                 talloc_free(tmp_ctx);
1401                 return nt_status;
1402         }
1403
1404         if (!(gensec_gssapi_state->gss_got_flags & GSS_C_DELEG_FLAG)) {
1405                 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1406         } else {
1407                 krb5_error_code ret;
1408                 const char *error_string;
1409
1410                 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1411                 session_info->credentials = cli_credentials_init(session_info);
1412                 if (!session_info->credentials) {
1413                         talloc_free(tmp_ctx);
1414                         return NT_STATUS_NO_MEMORY;
1415                 }
1416
1417                 cli_credentials_set_conf(session_info->credentials, gensec_security->settings->lp_ctx);
1418                 /* Just so we don't segfault trying to get at a username */
1419                 cli_credentials_set_anonymous(session_info->credentials);
1420
1421                 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1422                                                            gensec_security->settings->lp_ctx,
1423                                                            gensec_gssapi_state->delegated_cred_handle,
1424                                                            CRED_SPECIFIED, &error_string);
1425                 if (ret) {
1426                         talloc_free(tmp_ctx);
1427                         DEBUG(2,("Failed to get gss creds: %s\n", error_string));
1428                         return NT_STATUS_NO_MEMORY;
1429                 }
1430
1431                 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1432                 cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
1433
1434                 /* It has been taken from this place... */
1435                 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1436         }
1437         *_session_info = talloc_steal(mem_ctx, session_info);
1438         talloc_free(tmp_ctx);
1439
1440         return NT_STATUS_OK;
1441 }
1442
1443 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
1444 {
1445         struct gensec_gssapi_state *gensec_gssapi_state
1446                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1447         NTSTATUS status;
1448
1449         if (gensec_gssapi_state->sig_size) {
1450                 return gensec_gssapi_state->sig_size;
1451         }
1452
1453         if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1454                 gensec_gssapi_state->sig_size = 45;
1455         } else {
1456                 gensec_gssapi_state->sig_size = 37;
1457         }
1458
1459         status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1460         if (!NT_STATUS_IS_OK(status)) {
1461                 return gensec_gssapi_state->sig_size;
1462         }
1463
1464         if (gensec_gssapi_state->lucid->protocol == 1) {
1465                 if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1466                         /*
1467                          * TODO: windows uses 76 here, but we don't know
1468                          *       gss_wrap works with aes keys yet
1469                          */
1470                         gensec_gssapi_state->sig_size = 76;
1471                 } else {
1472                         gensec_gssapi_state->sig_size = 28;
1473                 }
1474         } else if (gensec_gssapi_state->lucid->protocol == 0) {
1475                 switch (gensec_gssapi_state->lucid->rfc1964_kd.ctx_key.type) {
1476                 case ENCTYPE_DES_CBC_CRC:
1477                 case ENCTYPE_ARCFOUR_HMAC:
1478                 case ENCTYPE_ARCFOUR_HMAC_EXP:
1479                         if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1480                                 gensec_gssapi_state->sig_size = 45;
1481                         } else {
1482                                 gensec_gssapi_state->sig_size = 37;
1483                         }
1484                         break;
1485 #ifdef SAMBA4_USES_HEIMDAL
1486                 case ENCTYPE_OLD_DES3_CBC_SHA1:
1487                         if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1488                                 gensec_gssapi_state->sig_size = 57;
1489                         } else {
1490                                 gensec_gssapi_state->sig_size = 49;
1491                         }
1492                         break;
1493 #endif
1494                 }
1495         }
1496
1497         return gensec_gssapi_state->sig_size;
1498 }
1499
1500 static const char *gensec_gssapi_krb5_oids[] = {
1501         GENSEC_OID_KERBEROS5_OLD,
1502         GENSEC_OID_KERBEROS5,
1503         NULL
1504 };
1505
1506 static const char *gensec_gssapi_spnego_oids[] = {
1507         GENSEC_OID_SPNEGO,
1508         NULL
1509 };
1510
1511 /* As a server, this could in theory accept any GSSAPI mech */
1512 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1513         .name           = "gssapi_spnego",
1514         .sasl_name      = "GSS-SPNEGO",
1515         .auth_type      = DCERPC_AUTH_TYPE_SPNEGO,
1516         .oid            = gensec_gssapi_spnego_oids,
1517         .client_start   = gensec_gssapi_client_start,
1518         .server_start   = gensec_gssapi_server_start,
1519         .magic          = gensec_magic_check_krb5_oid,
1520         .update         = gensec_gssapi_update,
1521         .session_key    = gensec_gssapi_session_key,
1522         .session_info   = gensec_gssapi_session_info,
1523         .sign_packet    = gensec_gssapi_sign_packet,
1524         .check_packet   = gensec_gssapi_check_packet,
1525         .seal_packet    = gensec_gssapi_seal_packet,
1526         .unseal_packet  = gensec_gssapi_unseal_packet,
1527         .wrap           = gensec_gssapi_wrap,
1528         .unwrap         = gensec_gssapi_unwrap,
1529         .have_feature   = gensec_gssapi_have_feature,
1530         .expire_time    = gensec_gssapi_expire_time,
1531         .enabled        = false,
1532         .kerberos       = true,
1533         .priority       = GENSEC_GSSAPI
1534 };
1535
1536 /* As a server, this could in theory accept any GSSAPI mech */
1537 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1538         .name           = "gssapi_krb5",
1539         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
1540         .oid            = gensec_gssapi_krb5_oids,
1541         .client_start   = gensec_gssapi_client_start,
1542         .server_start   = gensec_gssapi_server_start,
1543         .magic          = gensec_magic_check_krb5_oid,
1544         .update         = gensec_gssapi_update,
1545         .session_key    = gensec_gssapi_session_key,
1546         .session_info   = gensec_gssapi_session_info,
1547         .sig_size       = gensec_gssapi_sig_size,
1548         .sign_packet    = gensec_gssapi_sign_packet,
1549         .check_packet   = gensec_gssapi_check_packet,
1550         .seal_packet    = gensec_gssapi_seal_packet,
1551         .unseal_packet  = gensec_gssapi_unseal_packet,
1552         .wrap           = gensec_gssapi_wrap,
1553         .unwrap         = gensec_gssapi_unwrap,
1554         .have_feature   = gensec_gssapi_have_feature,
1555         .expire_time    = gensec_gssapi_expire_time,
1556         .enabled        = true,
1557         .kerberos       = true,
1558         .priority       = GENSEC_GSSAPI
1559 };
1560
1561 /* As a server, this could in theory accept any GSSAPI mech */
1562 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1563         .name             = "gssapi_krb5_sasl",
1564         .sasl_name        = "GSSAPI",
1565         .client_start     = gensec_gssapi_sasl_client_start,
1566         .server_start     = gensec_gssapi_sasl_server_start,
1567         .update           = gensec_gssapi_update,
1568         .session_key      = gensec_gssapi_session_key,
1569         .session_info     = gensec_gssapi_session_info,
1570         .max_input_size   = gensec_gssapi_max_input_size,
1571         .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1572         .wrap             = gensec_gssapi_wrap,
1573         .unwrap           = gensec_gssapi_unwrap,
1574         .have_feature     = gensec_gssapi_have_feature,
1575         .expire_time      = gensec_gssapi_expire_time,
1576         .enabled          = true,
1577         .kerberos         = true,
1578         .priority         = GENSEC_GSSAPI
1579 };
1580
1581 _PUBLIC_ NTSTATUS gensec_gssapi_init(void)
1582 {
1583         NTSTATUS ret;
1584
1585         ret = gensec_register(&gensec_gssapi_spnego_security_ops);
1586         if (!NT_STATUS_IS_OK(ret)) {
1587                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1588                         gensec_gssapi_spnego_security_ops.name));
1589                 return ret;
1590         }
1591
1592         ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1593         if (!NT_STATUS_IS_OK(ret)) {
1594                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1595                         gensec_gssapi_krb5_security_ops.name));
1596                 return ret;
1597         }
1598
1599         ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1600         if (!NT_STATUS_IS_OK(ret)) {
1601                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1602                         gensec_gssapi_sasl_krb5_security_ops.name));
1603                 return ret;
1604         }
1605
1606         return ret;
1607 }