source4/auth/gensec/gensec_gssapi.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Kerberos backend for GENSEC
   5
   6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
   7    Copyright (C) Stefan Metzmacher <metze@samba.org> 2004-2005
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "lib/events/events.h"
  26 #include "system/kerberos.h"
  27 #include "auth/kerberos/kerberos.h"
  28 #include "librpc/gen_ndr/krb5pac.h"
  29 #include "auth/auth.h"
  30 #include <ldb.h>
  31 #include "auth/auth_sam.h"
  32 #include "librpc/rpc/dcerpc.h"
  33 #include "auth/credentials/credentials.h"
  34 #include "auth/credentials/credentials_krb5.h"
  35 #include "auth/gensec/gensec.h"
  36 #include "auth/gensec/gensec_proto.h"
  37 #include "auth/gensec/gensec_toplevel_proto.h"
  38 #include "param/param.h"
  39 #include "auth/session_proto.h"
  40 #include <gssapi/gssapi.h>
  41 #include <gssapi/gssapi_krb5.h>
  42 #include <gssapi/gssapi_spnego.h>
  43 #include "auth/gensec/gensec_gssapi.h"
  44 #include "lib/util/util_net.h"
  45
  46 _PUBLIC_ NTSTATUS gensec_gssapi_init(void);
  47
  48 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security);
  49 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security);
  50
  51 static int gensec_gssapi_destructor(struct gensec_gssapi_state *gensec_gssapi_state)
  52 {
  53         OM_uint32 maj_stat, min_stat;
  54
  55         if (gensec_gssapi_state->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
  56                 maj_stat = gss_release_cred(&min_stat,
  57                                             &gensec_gssapi_state->delegated_cred_handle);
  58         }
  59
  60         if (gensec_gssapi_state->gssapi_context != GSS_C_NO_CONTEXT) {
  61                 maj_stat = gss_delete_sec_context (&min_stat,
  62                                                    &gensec_gssapi_state->gssapi_context,
  63                                                    GSS_C_NO_BUFFER);
  64         }
  65
  66         if (gensec_gssapi_state->server_name != GSS_C_NO_NAME) {
  67                 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->server_name);
  68         }
  69         if (gensec_gssapi_state->client_name != GSS_C_NO_NAME) {
  70                 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->client_name);
  71         }
  72
  73         if (gensec_gssapi_state->lucid) {
  74                 gss_krb5_free_lucid_sec_context(&min_stat, gensec_gssapi_state->lucid);
  75         }
  76
  77         return 0;
  78 }
  79
  80 static NTSTATUS gensec_gssapi_init_lucid(struct gensec_gssapi_state *gensec_gssapi_state)
  81 {
  82         OM_uint32 maj_stat, min_stat;
  83
  84         if (gensec_gssapi_state->lucid) {
  85                 return NT_STATUS_OK;
  86         }
  87
  88         maj_stat = gss_krb5_export_lucid_sec_context(&min_stat,
  89                                                      &gensec_gssapi_state->gssapi_context,
  90                                                      1,
  91                                                      (void **)&gensec_gssapi_state->lucid);
  92         if (maj_stat != GSS_S_COMPLETE) {
  93                 DEBUG(0,("gensec_gssapi_init_lucid: %s\n",
  94                         gssapi_error_string(gensec_gssapi_state,
  95                                             maj_stat, min_stat,
  96                                             gensec_gssapi_state->gss_oid)));
  97                 return NT_STATUS_INTERNAL_ERROR;
  98         }
  99
 100         if (gensec_gssapi_state->lucid->version != 1) {
 101                 DEBUG(0,("gensec_gssapi_init_lucid: lucid version[%d] != 1\n",
 102                         gensec_gssapi_state->lucid->version));
 103                 gss_krb5_free_lucid_sec_context(&min_stat, gensec_gssapi_state->lucid);
 104                 gensec_gssapi_state->lucid = NULL;
 105                 return NT_STATUS_INTERNAL_ERROR;
 106         }
 107
 108         return NT_STATUS_OK;
 109 }
 110
 111 static NTSTATUS gensec_gssapi_start(struct gensec_security *gensec_security)
 112 {
 113         struct gensec_gssapi_state *gensec_gssapi_state;
 114         krb5_error_code ret;
 115         const char *realm;
 116
 117         gensec_gssapi_state = talloc_zero(gensec_security, struct gensec_gssapi_state);
 118         if (!gensec_gssapi_state) {
 119                 return NT_STATUS_NO_MEMORY;
 120         }
 121
 122         gensec_security->private_data = gensec_gssapi_state;
 123
 124         gensec_gssapi_state->gssapi_context = GSS_C_NO_CONTEXT;
 125
 126         /* TODO: Fill in channel bindings */
 127         gensec_gssapi_state->input_chan_bindings = GSS_C_NO_CHANNEL_BINDINGS;
 128
 129         gensec_gssapi_state->server_name = GSS_C_NO_NAME;
 130         gensec_gssapi_state->client_name = GSS_C_NO_NAME;
 131
 132         gensec_gssapi_state->want_flags = 0;
 133
 134         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation_by_kdc_policy", true)) {
 135                 gensec_gssapi_state->want_flags |= GSS_C_DELEG_POLICY_FLAG;
 136         }
 137         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "mutual", true)) {
 138                 gensec_gssapi_state->want_flags |= GSS_C_MUTUAL_FLAG;
 139         }
 140         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation", true)) {
 141                 gensec_gssapi_state->want_flags |= GSS_C_DELEG_FLAG;
 142         }
 143         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "replay", true)) {
 144                 gensec_gssapi_state->want_flags |= GSS_C_REPLAY_FLAG;
 145         }
 146         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "sequence", true)) {
 147                 gensec_gssapi_state->want_flags |= GSS_C_SEQUENCE_FLAG;
 148         }
 149
 150         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 151                 gensec_gssapi_state->want_flags |= GSS_C_INTEG_FLAG;
 152         }
 153         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 154                 gensec_gssapi_state->want_flags |= GSS_C_CONF_FLAG;
 155         }
 156         if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
 157                 gensec_gssapi_state->want_flags |= GSS_C_DCE_STYLE;
 158         }
 159
 160         gensec_gssapi_state->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 {
 272         struct gensec_gssapi_state *gensec_gssapi_state;
 273         struct gssapi_creds_container *gcc;
 274         struct cli_credentials *creds = gensec_get_credentials(gensec_security);
 275         const char *error_string;
 276         int ret;
 277
 278         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 279
 280         /* Only run this the first time the update() call is made */
 281         if (gensec_gssapi_state->client_cred) {
 282                 return NT_STATUS_OK;
 283         }
 284
 285         ret = cli_credentials_get_client_gss_creds(creds,
 286                                                        gensec_security->event_ctx,
 287                                                        gensec_security->settings->lp_ctx, &gcc, &error_string);
 288         switch (ret) {
 289         case 0:
 290                 break;
 291         case EINVAL:
 292                 DEBUG(3, ("Cannot obtain client GSS credentials we need to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
 293                 return NT_STATUS_INVALID_PARAMETER;
 294         case KRB5KDC_ERR_PREAUTH_FAILED:
 295         case KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN:
 296                 DEBUG(1, ("Wrong username or password: %s\n", error_string));
 297                 return NT_STATUS_LOGON_FAILURE;
 298         case KRB5_KDC_UNREACH:
 299                 DEBUG(3, ("Cannot reach a KDC we require to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
 300                 return NT_STATUS_NO_LOGON_SERVERS;
 301         case KRB5_CC_NOTFOUND:
 302         case KRB5_CC_END:
 303                 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));
 304                 return NT_STATUS_TIME_DIFFERENCE_AT_DC;
 305         default:
 306                 DEBUG(1, ("Aquiring initiator credentials failed: %s\n", error_string));
 307                 return NT_STATUS_UNSUCCESSFUL;
 308         }
 309
 310         gensec_gssapi_state->client_cred = gcc;
 311         if (!talloc_reference(gensec_gssapi_state, gcc)) {
 312                 return NT_STATUS_NO_MEMORY;
 313         }
 314
 315         return NT_STATUS_OK;
 316 }
 317
 318 static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_security)
 319 {
 320         struct gensec_gssapi_state *gensec_gssapi_state;
 321         struct cli_credentials *creds = gensec_get_credentials(gensec_security);
 322         NTSTATUS nt_status;
 323         gss_buffer_desc name_token;
 324         gss_OID name_type;
 325         OM_uint32 maj_stat, min_stat;
 326         const char *hostname = gensec_get_target_hostname(gensec_security);
 327
 328         if (!hostname) {
 329                 DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
 330                 return NT_STATUS_INVALID_PARAMETER;
 331         }
 332         if (is_ipaddress(hostname)) {
 333                 DEBUG(2, ("Cannot do GSSAPI to an IP address\n"));
 334                 return NT_STATUS_INVALID_PARAMETER;
 335         }
 336         if (strcmp(hostname, "localhost") == 0) {
 337                 DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
 338                 return NT_STATUS_INVALID_PARAMETER;
 339         }
 340
 341         nt_status = gensec_gssapi_start(gensec_security);
 342         if (!NT_STATUS_IS_OK(nt_status)) {
 343                 return nt_status;
 344         }
 345
 346         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 347
 348         if (cli_credentials_get_impersonate_principal(creds)) {
 349                 gensec_gssapi_state->want_flags &= ~(GSS_C_DELEG_FLAG|GSS_C_DELEG_POLICY_FLAG);
 350         }
 351
 352         gensec_gssapi_state->target_principal = gensec_get_target_principal(gensec_security);
 353         if (gensec_gssapi_state->target_principal) {
 354                 name_type = GSS_C_NULL_OID;
 355         } else {
 356                 gensec_gssapi_state->target_principal = talloc_asprintf(gensec_gssapi_state, "%s/%s@%s",
 357                                             gensec_get_target_service(gensec_security),
 358                                             hostname, lpcfg_realm(gensec_security->settings->lp_ctx));
 359
 360                 name_type = GSS_C_NT_USER_NAME;
 361         }
 362         name_token.value  = discard_const_p(uint8_t, gensec_gssapi_state->target_principal);
 363         name_token.length = strlen(gensec_gssapi_state->target_principal);
 364
 365
 366         maj_stat = gss_import_name (&min_stat,
 367                                     &name_token,
 368                                     name_type,
 369                                     &gensec_gssapi_state->server_name);
 370         if (maj_stat) {
 371                 DEBUG(2, ("GSS Import name of %s failed: %s\n",
 372                           (char *)name_token.value,
 373                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 374                 return NT_STATUS_INVALID_PARAMETER;
 375         }
 376
 377         return NT_STATUS_OK;
 378 }
 379
 380 static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
 381 {
 382         NTSTATUS nt_status;
 383         struct gensec_gssapi_state *gensec_gssapi_state;
 384         nt_status = gensec_gssapi_client_start(gensec_security);
 385
 386         if (NT_STATUS_IS_OK(nt_status)) {
 387                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 388                 gensec_gssapi_state->sasl = true;
 389         }
 390         return nt_status;
 391 }
 392
 393
 394 /**
 395  * Check if the packet is one for this mechansim
 396  *
 397  * @param gensec_security GENSEC state
 398  * @param in The request, as a DATA_BLOB
 399  * @return Error, INVALID_PARAMETER if it's not a packet for us
 400  *                or NT_STATUS_OK if the packet is ok.
 401  */
 402
 403 static NTSTATUS gensec_gssapi_magic(struct gensec_security *gensec_security,
 404                                     const DATA_BLOB *in)
 405 {
 406         if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
 407                 return NT_STATUS_OK;
 408         } else {
 409                 return NT_STATUS_INVALID_PARAMETER;
 410         }
 411 }
 412
 413
 414 /**
 415  * Next state function for the GSSAPI GENSEC mechanism
 416  *
 417  * @param gensec_gssapi_state GSSAPI State
 418  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 419  * @param in The request, as a DATA_BLOB
 420  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 421  * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
 422  *                or NT_STATUS_OK if the user is authenticated.
 423  */
 424
 425 static NTSTATUS gensec_gssapi_update(struct gensec_security *gensec_security,
 426                                    TALLOC_CTX *out_mem_ctx,
 427                                    const DATA_BLOB in, DATA_BLOB *out)
 428 {
 429         struct gensec_gssapi_state *gensec_gssapi_state
 430                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 431         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 432         OM_uint32 maj_stat, min_stat;
 433         OM_uint32 min_stat2;
 434         gss_buffer_desc input_token, output_token;
 435         gss_OID gss_oid_p = NULL;
 436         input_token.length = in.length;
 437         input_token.value = in.data;
 438
 439         switch (gensec_gssapi_state->sasl_state) {
 440         case STAGE_GSS_NEG:
 441         {
 442                 switch (gensec_security->gensec_role) {
 443                 case GENSEC_CLIENT:
 444                 {
 445                         struct gsskrb5_send_to_kdc send_to_kdc;
 446                         krb5_error_code ret;
 447
 448                         nt_status = gensec_gssapi_client_creds(gensec_security);
 449                         if (!NT_STATUS_IS_OK(nt_status)) {
 450                                 return nt_status;
 451                         }
 452
 453                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 454                         send_to_kdc.ptr = gensec_security->event_ctx;
 455
 456                         min_stat = gsskrb5_set_send_to_kdc(&send_to_kdc);
 457                         if (min_stat) {
 458                                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
 459                                 return NT_STATUS_INTERNAL_ERROR;
 460                         }
 461
 462                         maj_stat = gss_init_sec_context(&min_stat,
 463                                                         gensec_gssapi_state->client_cred->creds,
 464                                                         &gensec_gssapi_state->gssapi_context,
 465                                                         gensec_gssapi_state->server_name,
 466                                                         gensec_gssapi_state->gss_oid,
 467                                                         gensec_gssapi_state->want_flags,
 468                                                         0,
 469                                                         gensec_gssapi_state->input_chan_bindings,
 470                                                         &input_token,
 471                                                         &gss_oid_p,
 472                                                         &output_token,
 473                                                         &gensec_gssapi_state->got_flags, /* ret flags */
 474                                                         NULL);
 475                         if (gss_oid_p) {
 476                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 477                         }
 478
 479                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 480                         send_to_kdc.ptr = NULL;
 481
 482                         ret = gsskrb5_set_send_to_kdc(&send_to_kdc);
 483                         if (ret) {
 484                                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
 485                                 return NT_STATUS_INTERNAL_ERROR;
 486                         }
 487
 488                         break;
 489                 }
 490                 case GENSEC_SERVER:
 491                 {
 492                         maj_stat = gss_accept_sec_context(&min_stat,
 493                                                           &gensec_gssapi_state->gssapi_context,
 494                                                           gensec_gssapi_state->server_cred->creds,
 495                                                           &input_token,
 496                                                           gensec_gssapi_state->input_chan_bindings,
 497                                                           &gensec_gssapi_state->client_name,
 498                                                           &gss_oid_p,
 499                                                           &output_token,
 500                                                           &gensec_gssapi_state->got_flags,
 501                                                           NULL,
 502                                                           &gensec_gssapi_state->delegated_cred_handle);
 503                         if (gss_oid_p) {
 504                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 505                         }
 506                         break;
 507                 }
 508                 default:
 509                         return NT_STATUS_INVALID_PARAMETER;
 510
 511                 }
 512
 513                 gensec_gssapi_state->gss_exchange_count++;
 514
 515                 if (maj_stat == GSS_S_COMPLETE) {
 516                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 517                         gss_release_buffer(&min_stat2, &output_token);
 518
 519                         if (gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG) {
 520                                 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
 521                         } else {
 522                                 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
 523                         }
 524
 525                         /* We may have been invoked as SASL, so there
 526                          * is more work to do */
 527                         if (gensec_gssapi_state->sasl) {
 528                                 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
 529                                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 530                         } else {
 531                                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 532
 533                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 534                                         DEBUG(5, ("GSSAPI Connection will be cryptographically sealed\n"));
 535                                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 536                                         DEBUG(5, ("GSSAPI Connection will be cryptographically signed\n"));
 537                                 } else {
 538                                         DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
 539                                 }
 540
 541                                 return NT_STATUS_OK;
 542                         }
 543                 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
 544                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 545                         gss_release_buffer(&min_stat2, &output_token);
 546
 547                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 548                 } else if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
 549                         gss_cred_id_t creds;
 550                         gss_name_t name;
 551                         gss_buffer_desc buffer;
 552                         OM_uint32 lifetime = 0;
 553                         gss_cred_usage_t usage;
 554                         const char *role = NULL;
 555                         DEBUG(0, ("GSS %s Update(krb5)(%d) Update failed, credentials expired during GSSAPI handshake!\n",
 556                                   role,
 557                                   gensec_gssapi_state->gss_exchange_count));
 558
 559
 560                         switch (gensec_security->gensec_role) {
 561                         case GENSEC_CLIENT:
 562                                 creds = gensec_gssapi_state->client_cred->creds;
 563                                 role = "client";
 564                         case GENSEC_SERVER:
 565                                 creds = gensec_gssapi_state->server_cred->creds;
 566                                 role = "server";
 567                         }
 568
 569                         maj_stat = gss_inquire_cred(&min_stat,
 570                                                     creds,
 571                                                     &name, &lifetime, &usage, NULL);
 572
 573                         if (maj_stat == GSS_S_COMPLETE) {
 574                                 const char *usage_string;
 575                                 switch (usage) {
 576                                 case GSS_C_BOTH:
 577                                         usage_string = "GSS_C_BOTH";
 578                                         break;
 579                                 case GSS_C_ACCEPT:
 580                                         usage_string = "GSS_C_ACCEPT";
 581                                         break;
 582                                 case GSS_C_INITIATE:
 583                                         usage_string = "GSS_C_INITIATE";
 584                                         break;
 585                                 }
 586                                 maj_stat = gss_display_name(&min_stat, name, &buffer, NULL);
 587                                 if (maj_stat) {
 588                                         buffer.value = NULL;
 589                                         buffer.length = 0;
 590                                 }
 591                                 if (lifetime > 0) {
 592                                         DEBUG(0, ("GSSAPI gss_inquire_cred indicates expiry of %*.*s in %u sec for %s\n",
 593                                                   (int)buffer.length, (int)buffer.length, (char *)buffer.value,
 594                                                   lifetime, usage_string));
 595                                 } else {
 596                                         DEBUG(0, ("GSSAPI gss_inquire_cred indicates %*.*s has already expired for %s\n",
 597                                                   (int)buffer.length, (int)buffer.length, (char *)buffer.value,
 598                                                   usage_string));
 599                                 }
 600                                 gss_release_buffer(&min_stat, &buffer);
 601                                 gss_release_name(&min_stat, &name);
 602                         } else if (maj_stat != GSS_S_COMPLETE) {
 603                                 DEBUG(0, ("inquiry of credential lifefime via GSSAPI gss_inquire_cred failed: %s\n",
 604                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 605                         }
 606                         return NT_STATUS_INVALID_PARAMETER;
 607                 } else if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
 608                         switch (min_stat) {
 609                         case KRB5KRB_AP_ERR_TKT_NYV:
 610                                 DEBUG(1, ("Error with ticket to contact %s: possible clock skew between us and the KDC or target server: %s\n",
 611                                           gensec_gssapi_state->target_principal,
 612                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 613                                 return NT_STATUS_TIME_DIFFERENCE_AT_DC; /* Make SPNEGO ignore us, we can't go any further here */
 614                         case KRB5KRB_AP_ERR_TKT_EXPIRED:
 615                                 DEBUG(1, ("Error with ticket to contact %s: ticket is expired, possible clock skew between us and the KDC or target server: %s\n",
 616                                           gensec_gssapi_state->target_principal,
 617                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 618                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 619                         case KRB5_KDC_UNREACH:
 620                                 DEBUG(3, ("Cannot reach a KDC we require in order to obtain a ticetk to %s: %s\n",
 621                                           gensec_gssapi_state->target_principal,
 622                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 623                                 return NT_STATUS_NO_LOGON_SERVERS; /* Make SPNEGO ignore us, we can't go any further here */
 624                         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 625                                 DEBUG(3, ("Server %s is not registered with our KDC: %s\n",
 626                                           gensec_gssapi_state->target_principal,
 627                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 628                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 629                         case KRB5KRB_AP_ERR_MSG_TYPE:
 630                                 /* garbage input, possibly from the auto-mech detection */
 631                                 return NT_STATUS_INVALID_PARAMETER;
 632                         default:
 633                                 DEBUG(1, ("GSS %s Update(krb5)(%d) Update failed: %s\n",
 634                                           gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 635                                           gensec_gssapi_state->gss_exchange_count,
 636                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 637                                 return nt_status;
 638                         }
 639                 } else {
 640                         DEBUG(1, ("GSS %s Update(%d) failed: %s\n",
 641                                   gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 642                                   gensec_gssapi_state->gss_exchange_count,
 643                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 644                         return nt_status;
 645                 }
 646                 break;
 647         }
 648
 649         /* These last two stages are only done if we were invoked as SASL */
 650         case STAGE_SASL_SSF_NEG:
 651         {
 652                 switch (gensec_security->gensec_role) {
 653                 case GENSEC_CLIENT:
 654                 {
 655                         uint8_t maxlength_proposed[4];
 656                         uint8_t maxlength_accepted[4];
 657                         uint8_t security_supported;
 658                         int conf_state;
 659                         gss_qop_t qop_state;
 660                         input_token.length = in.length;
 661                         input_token.value = in.data;
 662
 663                         /* As a client, we have just send a
 664                          * zero-length blob to the server (after the
 665                          * normal GSSAPI exchange), and it has replied
 666                          * with it's SASL negotiation */
 667
 668                         maj_stat = gss_unwrap(&min_stat,
 669                                               gensec_gssapi_state->gssapi_context,
 670                                               &input_token,
 671                                               &output_token,
 672                                               &conf_state,
 673                                               &qop_state);
 674                         if (GSS_ERROR(maj_stat)) {
 675                                 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 676                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 677                                 return NT_STATUS_ACCESS_DENIED;
 678                         }
 679
 680                         if (output_token.length < 4) {
 681                                 return NT_STATUS_INVALID_PARAMETER;
 682                         }
 683
 684                         memcpy(maxlength_proposed, output_token.value, 4);
 685                         gss_release_buffer(&min_stat, &output_token);
 686
 687                         /* first byte is the proposed security */
 688                         security_supported = maxlength_proposed[0];
 689                         maxlength_proposed[0] = '\0';
 690
 691                         /* Rest is the proposed max wrap length */
 692                         gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
 693                                                                      gensec_gssapi_state->max_wrap_buf_size);
 694                         gensec_gssapi_state->sasl_protection = 0;
 695                         if (security_supported & NEG_SEAL) {
 696                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 697                                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 698                                 }
 699                         }
 700                         if (security_supported & NEG_SIGN) {
 701                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 702                                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 703                                 }
 704                         }
 705                         if (security_supported & NEG_NONE) {
 706                                 gensec_gssapi_state->sasl_protection |= NEG_NONE;
 707                         }
 708                         if (gensec_gssapi_state->sasl_protection == 0) {
 709                                 DEBUG(1, ("Remote server does not support unprotected connections\n"));
 710                                 return NT_STATUS_ACCESS_DENIED;
 711                         }
 712
 713                         /* Send back the negotiated max length */
 714
 715                         RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
 716
 717                         maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
 718
 719                         input_token.value = maxlength_accepted;
 720                         input_token.length = sizeof(maxlength_accepted);
 721
 722                         maj_stat = gss_wrap(&min_stat,
 723                                             gensec_gssapi_state->gssapi_context,
 724                                             false,
 725                                             GSS_C_QOP_DEFAULT,
 726                                             &input_token,
 727                                             &conf_state,
 728                                             &output_token);
 729                         if (GSS_ERROR(maj_stat)) {
 730                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 731                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 732                                 return NT_STATUS_ACCESS_DENIED;
 733                         }
 734
 735                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 736                         gss_release_buffer(&min_stat, &output_token);
 737
 738                         /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 739                         gensec_gssapi_state->sasl_state = STAGE_DONE;
 740
 741                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 742                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically sealed\n"));
 743                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 744                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically signed\n"));
 745                         } else {
 746                                 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographically protection\n"));
 747                         }
 748
 749                         return NT_STATUS_OK;
 750                 }
 751                 case GENSEC_SERVER:
 752                 {
 753                         uint8_t maxlength_proposed[4];
 754                         uint8_t security_supported = 0x0;
 755                         int conf_state;
 756
 757                         /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
 758                         if (in.length != 0) {
 759                                 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
 760                         }
 761
 762                         /* Give the client some idea what we will support */
 763
 764                         RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
 765                         /* first byte is the proposed security */
 766                         maxlength_proposed[0] = '\0';
 767
 768                         gensec_gssapi_state->sasl_protection = 0;
 769                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 770                                 security_supported |= NEG_SEAL;
 771                         }
 772                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 773                                 security_supported |= NEG_SIGN;
 774                         }
 775                         if (security_supported == 0) {
 776                                 /* If we don't support anything, this must be 0 */
 777                                 RSIVAL(maxlength_proposed, 0, 0x0);
 778                         }
 779
 780                         /* TODO:  We may not wish to support this */
 781                         security_supported |= NEG_NONE;
 782                         maxlength_proposed[0] = security_supported;
 783
 784                         input_token.value = maxlength_proposed;
 785                         input_token.length = sizeof(maxlength_proposed);
 786
 787                         maj_stat = gss_wrap(&min_stat,
 788                                             gensec_gssapi_state->gssapi_context,
 789                                             false,
 790                                             GSS_C_QOP_DEFAULT,
 791                                             &input_token,
 792                                             &conf_state,
 793                                             &output_token);
 794                         if (GSS_ERROR(maj_stat)) {
 795                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 796                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 797                                 return NT_STATUS_ACCESS_DENIED;
 798                         }
 799
 800                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 801                         gss_release_buffer(&min_stat, &output_token);
 802
 803                         gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
 804                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 805                 }
 806                 default:
 807                         return NT_STATUS_INVALID_PARAMETER;
 808
 809                 }
 810         }
 811         /* This is s server-only stage */
 812         case STAGE_SASL_SSF_ACCEPT:
 813         {
 814                 uint8_t maxlength_accepted[4];
 815                 uint8_t security_accepted;
 816                 int conf_state;
 817                 gss_qop_t qop_state;
 818                 input_token.length = in.length;
 819                 input_token.value = in.data;
 820
 821                 maj_stat = gss_unwrap(&min_stat,
 822                                       gensec_gssapi_state->gssapi_context,
 823                                       &input_token,
 824                                       &output_token,
 825                                       &conf_state,
 826                                       &qop_state);
 827                 if (GSS_ERROR(maj_stat)) {
 828                         DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 829                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 830                         return NT_STATUS_ACCESS_DENIED;
 831                 }
 832
 833                 if (output_token.length < 4) {
 834                         return NT_STATUS_INVALID_PARAMETER;
 835                 }
 836
 837                 memcpy(maxlength_accepted, output_token.value, 4);
 838                 gss_release_buffer(&min_stat, &output_token);
 839
 840                 /* first byte is the proposed security */
 841                 security_accepted = maxlength_accepted[0];
 842                 maxlength_accepted[0] = '\0';
 843
 844                 /* Rest is the proposed max wrap length */
 845                 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
 846                                                              gensec_gssapi_state->max_wrap_buf_size);
 847
 848                 gensec_gssapi_state->sasl_protection = 0;
 849                 if (security_accepted & NEG_SEAL) {
 850                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 851                                 DEBUG(1, ("Remote client wanted seal, but gensec refused\n"));
 852                                 return NT_STATUS_ACCESS_DENIED;
 853                         }
 854                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 855                 }
 856                 if (security_accepted & NEG_SIGN) {
 857                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 858                                 DEBUG(1, ("Remote client wanted sign, but gensec refused\n"));
 859                                 return NT_STATUS_ACCESS_DENIED;
 860                         }
 861                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 862                 }
 863                 if (security_accepted & NEG_NONE) {
 864                         gensec_gssapi_state->sasl_protection |= NEG_NONE;
 865                 }
 866
 867                 /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 868                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 869                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 870                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically sealed\n"));
 871                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 872                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically signed\n"));
 873                 } else {
 874                         DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
 875                 }
 876
 877                 *out = data_blob(NULL, 0);
 878                 return NT_STATUS_OK;
 879         }
 880         default:
 881                 return NT_STATUS_INVALID_PARAMETER;
 882         }
 883 }
 884
 885 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
 886                                    TALLOC_CTX *mem_ctx,
 887                                    const DATA_BLOB *in,
 888                                    DATA_BLOB *out)
 889 {
 890         struct gensec_gssapi_state *gensec_gssapi_state
 891                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 892         OM_uint32 maj_stat, min_stat;
 893         gss_buffer_desc input_token, output_token;
 894         int conf_state;
 895         input_token.length = in->length;
 896         input_token.value = in->data;
 897
 898         maj_stat = gss_wrap(&min_stat,
 899                             gensec_gssapi_state->gssapi_context,
 900                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 901                             GSS_C_QOP_DEFAULT,
 902                             &input_token,
 903                             &conf_state,
 904                             &output_token);
 905         if (GSS_ERROR(maj_stat)) {
 906                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 907                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 908                 return NT_STATUS_ACCESS_DENIED;
 909         }
 910
 911         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 912         gss_release_buffer(&min_stat, &output_token);
 913
 914         if (gensec_gssapi_state->sasl) {
 915                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 916                 if (max_wrapped_size < out->length) {
 917                         DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
 918                                   (unsigned)in->length,
 919                                   (unsigned)out->length,
 920                                   (unsigned int)max_wrapped_size));
 921                         return NT_STATUS_INVALID_PARAMETER;
 922                 }
 923         }
 924
 925         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 926             && !conf_state) {
 927                 return NT_STATUS_ACCESS_DENIED;
 928         }
 929         return NT_STATUS_OK;
 930 }
 931
 932 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
 933                                      TALLOC_CTX *mem_ctx,
 934                                      const DATA_BLOB *in,
 935                                      DATA_BLOB *out)
 936 {
 937         struct gensec_gssapi_state *gensec_gssapi_state
 938                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 939         OM_uint32 maj_stat, min_stat;
 940         gss_buffer_desc input_token, output_token;
 941         int conf_state;
 942         gss_qop_t qop_state;
 943         input_token.length = in->length;
 944         input_token.value = in->data;
 945
 946         if (gensec_gssapi_state->sasl) {
 947                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 948                 if (max_wrapped_size < in->length) {
 949                         DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
 950                         return NT_STATUS_INVALID_PARAMETER;
 951                 }
 952         }
 953
 954         maj_stat = gss_unwrap(&min_stat,
 955                               gensec_gssapi_state->gssapi_context,
 956                               &input_token,
 957                               &output_token,
 958                               &conf_state,
 959                               &qop_state);
 960         if (GSS_ERROR(maj_stat)) {
 961                 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
 962                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 963                 return NT_STATUS_ACCESS_DENIED;
 964         }
 965
 966         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 967         gss_release_buffer(&min_stat, &output_token);
 968
 969         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 970             && !conf_state) {
 971                 return NT_STATUS_ACCESS_DENIED;
 972         }
 973         return NT_STATUS_OK;
 974 }
 975
 976 /* Find out the maximum input size negotiated on this connection */
 977
 978 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
 979 {
 980         struct gensec_gssapi_state *gensec_gssapi_state
 981                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 982         OM_uint32 maj_stat, min_stat;
 983         OM_uint32 max_input_size;
 984
 985         maj_stat = gss_wrap_size_limit(&min_stat,
 986                                        gensec_gssapi_state->gssapi_context,
 987                                        gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 988                                        GSS_C_QOP_DEFAULT,
 989                                        gensec_gssapi_state->max_wrap_buf_size,
 990                                        &max_input_size);
 991         if (GSS_ERROR(maj_stat)) {
 992                 TALLOC_CTX *mem_ctx = talloc_new(NULL);
 993                 DEBUG(1, ("gensec_gssapi_max_input_size: determinaing signature size with gss_wrap_size_limit failed: %s\n",
 994                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 995                 talloc_free(mem_ctx);
 996                 return 0;
 997         }
 998
 999         return max_input_size;
1000 }
1001
1002 /* Find out the maximum output size negotiated on this connection */
1003 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
1004 {
1005         struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
1006         return gensec_gssapi_state->max_wrap_buf_size;
1007 }
1008
1009 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
1010                                           TALLOC_CTX *mem_ctx,
1011                                           uint8_t *data, size_t length,
1012                                           const uint8_t *whole_pdu, size_t pdu_length,
1013                                           DATA_BLOB *sig)
1014 {
1015         struct gensec_gssapi_state *gensec_gssapi_state
1016                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1017         OM_uint32 maj_stat, min_stat;
1018         gss_buffer_desc input_token, output_token;
1019         int conf_state;
1020         ssize_t sig_length;
1021
1022         input_token.length = length;
1023         input_token.value = data;
1024
1025         maj_stat = gss_wrap(&min_stat,
1026                             gensec_gssapi_state->gssapi_context,
1027                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
1028                             GSS_C_QOP_DEFAULT,
1029                             &input_token,
1030                             &conf_state,
1031                             &output_token);
1032         if (GSS_ERROR(maj_stat)) {
1033                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
1034                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1035                 return NT_STATUS_ACCESS_DENIED;
1036         }
1037
1038         if (output_token.length < input_token.length) {
1039                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
1040                           (long)output_token.length, (long)length));
1041                 return NT_STATUS_INTERNAL_ERROR;
1042         }
1043         sig_length = output_token.length - input_token.length;
1044
1045         memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
1046         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
1047
1048         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1049         dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
1050         dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
1051
1052         gss_release_buffer(&min_stat, &output_token);
1053
1054         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1055             && !conf_state) {
1056                 return NT_STATUS_ACCESS_DENIED;
1057         }
1058         return NT_STATUS_OK;
1059 }
1060
1061 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
1062                                             uint8_t *data, size_t length,
1063                                             const uint8_t *whole_pdu, size_t pdu_length,
1064                                             const DATA_BLOB *sig)
1065 {
1066         struct gensec_gssapi_state *gensec_gssapi_state
1067                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1068         OM_uint32 maj_stat, min_stat;
1069         gss_buffer_desc input_token, output_token;
1070         int conf_state;
1071         gss_qop_t qop_state;
1072         DATA_BLOB in;
1073
1074         dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
1075
1076         in = data_blob_talloc(gensec_security, NULL, sig->length + length);
1077
1078         memcpy(in.data, sig->data, sig->length);
1079         memcpy(in.data + sig->length, data, length);
1080
1081         input_token.length = in.length;
1082         input_token.value = in.data;
1083
1084         maj_stat = gss_unwrap(&min_stat,
1085                               gensec_gssapi_state->gssapi_context,
1086                               &input_token,
1087                               &output_token,
1088                               &conf_state,
1089                               &qop_state);
1090         talloc_free(in.data);
1091         if (GSS_ERROR(maj_stat)) {
1092                 char *error_string = gssapi_error_string(NULL, maj_stat, min_stat, gensec_gssapi_state->gss_oid);
1093                 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
1094                           error_string));
1095                 talloc_free(error_string);
1096                 return NT_STATUS_ACCESS_DENIED;
1097         }
1098
1099         if (output_token.length != length) {
1100                 return NT_STATUS_INTERNAL_ERROR;
1101         }
1102
1103         memcpy(data, output_token.value, length);
1104
1105         gss_release_buffer(&min_stat, &output_token);
1106
1107         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1108             && !conf_state) {
1109                 return NT_STATUS_ACCESS_DENIED;
1110         }
1111         return NT_STATUS_OK;
1112 }
1113
1114 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1115                                           TALLOC_CTX *mem_ctx,
1116                                           const uint8_t *data, size_t length,
1117                                           const uint8_t *whole_pdu, size_t pdu_length,
1118                                           DATA_BLOB *sig)
1119 {
1120         struct gensec_gssapi_state *gensec_gssapi_state
1121                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1122         OM_uint32 maj_stat, min_stat;
1123         gss_buffer_desc input_token, output_token;
1124
1125         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1126                 input_token.length = pdu_length;
1127                 input_token.value = discard_const_p(uint8_t *, whole_pdu);
1128         } else {
1129                 input_token.length = length;
1130                 input_token.value = discard_const_p(uint8_t *, data);
1131         }
1132
1133         maj_stat = gss_get_mic(&min_stat,
1134                             gensec_gssapi_state->gssapi_context,
1135                             GSS_C_QOP_DEFAULT,
1136                             &input_token,
1137                             &output_token);
1138         if (GSS_ERROR(maj_stat)) {
1139                 DEBUG(1, ("GSS GetMic failed: %s\n",
1140                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1141                 return NT_STATUS_ACCESS_DENIED;
1142         }
1143
1144         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, output_token.length);
1145
1146         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1147
1148         gss_release_buffer(&min_stat, &output_token);
1149
1150         return NT_STATUS_OK;
1151 }
1152
1153 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1154                                            const uint8_t *data, size_t length,
1155                                            const uint8_t *whole_pdu, size_t pdu_length,
1156                                            const DATA_BLOB *sig)
1157 {
1158         struct gensec_gssapi_state *gensec_gssapi_state
1159                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1160         OM_uint32 maj_stat, min_stat;
1161         gss_buffer_desc input_token;
1162         gss_buffer_desc input_message;
1163         gss_qop_t qop_state;
1164
1165         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1166
1167         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1168                 input_message.length = pdu_length;
1169                 input_message.value = discard_const(whole_pdu);
1170         } else {
1171                 input_message.length = length;
1172                 input_message.value = discard_const(data);
1173         }
1174
1175         input_token.length = sig->length;
1176         input_token.value = sig->data;
1177
1178         maj_stat = gss_verify_mic(&min_stat,
1179                               gensec_gssapi_state->gssapi_context,
1180                               &input_message,
1181                               &input_token,
1182                               &qop_state);
1183         if (GSS_ERROR(maj_stat)) {
1184                 char *error_string = gssapi_error_string(NULL, maj_stat, min_stat, gensec_gssapi_state->gss_oid);
1185                 DEBUG(1, ("GSS VerifyMic failed: %s\n", error_string));
1186                 talloc_free(error_string);
1187
1188                 return NT_STATUS_ACCESS_DENIED;
1189         }
1190
1191         return NT_STATUS_OK;
1192 }
1193
1194 /* Try to figure out what features we actually got on the connection */
1195 static bool gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1196                                        uint32_t feature)
1197 {
1198         struct gensec_gssapi_state *gensec_gssapi_state
1199                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1200         if (feature & GENSEC_FEATURE_SIGN) {
1201                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1202                 if (gensec_gssapi_state->sasl
1203                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1204                         return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1205                                 && (gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG));
1206                 }
1207                 return gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG;
1208         }
1209         if (feature & GENSEC_FEATURE_SEAL) {
1210                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1211                 if (gensec_gssapi_state->sasl
1212                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1213                         return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1214                                  && (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG));
1215                 }
1216                 return gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG;
1217         }
1218         if (feature & GENSEC_FEATURE_SESSION_KEY) {
1219                 /* Only for GSSAPI/Krb5 */
1220                 if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
1221                         return true;
1222                 }
1223         }
1224         if (feature & GENSEC_FEATURE_DCE_STYLE) {
1225                 return gensec_gssapi_state->got_flags & GSS_C_DCE_STYLE;
1226         }
1227         if (feature & GENSEC_FEATURE_NEW_SPNEGO) {
1228                 NTSTATUS status;
1229
1230                 if (!(gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG)) {
1231                         return false;
1232                 }
1233
1234                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "force_new_spnego", false)) {
1235                         return true;
1236                 }
1237                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "disable_new_spnego", false)) {
1238                         return false;
1239                 }
1240
1241                 status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1242                 if (!NT_STATUS_IS_OK(status)) {
1243                         return false;
1244                 }
1245
1246                 if (gensec_gssapi_state->lucid->protocol == 1) {
1247                         return true;
1248                 }
1249
1250                 return false;
1251         }
1252         /* We can always do async (rather than strict request/reply) packets.  */
1253         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1254                 return true;
1255         }
1256         return false;
1257 }
1258
1259 /*
1260  * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1261  * (for encrypting some passwords).
1262  *
1263  * This breaks all the abstractions, but what do you expect...
1264  */
1265 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1266                                           TALLOC_CTX *mem_ctx,
1267                                           DATA_BLOB *session_key)
1268 {
1269         struct gensec_gssapi_state *gensec_gssapi_state
1270                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1271         OM_uint32 maj_stat, min_stat;
1272         krb5_keyblock *subkey;
1273
1274         if (gensec_gssapi_state->sasl_state != STAGE_DONE) {
1275                 return NT_STATUS_NO_USER_SESSION_KEY;
1276         }
1277
1278         maj_stat = gsskrb5_get_subkey(&min_stat,
1279                                       gensec_gssapi_state->gssapi_context,
1280                                       &subkey);
1281         if (maj_stat != 0) {
1282                 DEBUG(1, ("NO session key for this mech\n"));
1283                 return NT_STATUS_NO_USER_SESSION_KEY;
1284         }
1285
1286         DEBUG(10, ("Got KRB5 session key of length %d%s\n",
1287                    (int)KRB5_KEY_LENGTH(subkey),
1288                    (gensec_gssapi_state->sasl_state == STAGE_DONE)?" (done)":""));
1289         *session_key = data_blob_talloc(mem_ctx,
1290                                         KRB5_KEY_DATA(subkey), KRB5_KEY_LENGTH(subkey));
1291         krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context, subkey);
1292         dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
1293
1294         return NT_STATUS_OK;
1295 }
1296
1297 /* Get some basic (and authorization) information about the user on
1298  * this session.  This uses either the PAC (if present) or a local
1299  * database lookup */
1300 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1301                                            TALLOC_CTX *mem_ctx_out,
1302                                            struct auth_session_info **_session_info)
1303 {
1304         NTSTATUS nt_status;
1305         TALLOC_CTX *mem_ctx;
1306         struct gensec_gssapi_state *gensec_gssapi_state
1307                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1308         struct auth_user_info_dc *user_info_dc = NULL;
1309         struct auth_session_info *session_info = NULL;
1310         OM_uint32 maj_stat, min_stat;
1311         DATA_BLOB pac_blob;
1312         struct PAC_SIGNATURE_DATA *pac_srv_sig = NULL;
1313         struct PAC_SIGNATURE_DATA *pac_kdc_sig = NULL;
1314
1315         if ((gensec_gssapi_state->gss_oid->length != gss_mech_krb5->length)
1316             || (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
1317                        gensec_gssapi_state->gss_oid->length) != 0)) {
1318                 DEBUG(1, ("NO session info available for this mech\n"));
1319                 return NT_STATUS_INVALID_PARAMETER;
1320         }
1321
1322         mem_ctx = talloc_named(mem_ctx_out, 0, "gensec_gssapi_session_info context");
1323         NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
1324
1325         nt_status = gssapi_obtain_pac_blob(mem_ctx,  gensec_gssapi_state->gssapi_context,
1326                                            gensec_gssapi_state->client_name,
1327                                            &pac_blob);
1328
1329         /* IF we have the PAC - otherwise we need to get this
1330          * data from elsewere - local ldb, or (TODO) lookup of some
1331          * kind...
1332          */
1333         if (NT_STATUS_IS_OK(nt_status)) {
1334                 pac_srv_sig = talloc(mem_ctx, struct PAC_SIGNATURE_DATA);
1335                 if (!pac_srv_sig) {
1336                         talloc_free(mem_ctx);
1337                         return NT_STATUS_NO_MEMORY;
1338                 }
1339                 pac_kdc_sig = talloc(mem_ctx, struct PAC_SIGNATURE_DATA);
1340                 if (!pac_kdc_sig) {
1341                         talloc_free(mem_ctx);
1342                         return NT_STATUS_NO_MEMORY;
1343                 }
1344
1345                 nt_status = kerberos_pac_blob_to_user_info_dc(mem_ctx,
1346                                                               pac_blob,
1347                                                               gensec_gssapi_state->smb_krb5_context->krb5_context,
1348                                                               &user_info_dc,
1349                                                               pac_srv_sig,
1350                                                               pac_kdc_sig);
1351                 if (!NT_STATUS_IS_OK(nt_status)) {
1352                         talloc_free(mem_ctx);
1353                         return nt_status;
1354                 }
1355         } else {
1356                 gss_buffer_desc name_token;
1357                 char *principal_string;
1358
1359                 maj_stat = gss_display_name (&min_stat,
1360                                              gensec_gssapi_state->client_name,
1361                                              &name_token,
1362                                              NULL);
1363                 if (GSS_ERROR(maj_stat)) {
1364                         DEBUG(1, ("GSS display_name failed: %s\n",
1365                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1366                         talloc_free(mem_ctx);
1367                         return NT_STATUS_FOOBAR;
1368                 }
1369
1370                 principal_string = talloc_strndup(mem_ctx,
1371                                                   (const char *)name_token.value,
1372                                                   name_token.length);
1373
1374                 gss_release_buffer(&min_stat, &name_token);
1375
1376                 if (!principal_string) {
1377                         talloc_free(mem_ctx);
1378                         return NT_STATUS_NO_MEMORY;
1379                 }
1380
1381                 if (gensec_security->auth_context &&
1382                     !gensec_setting_bool(gensec_security->settings, "gensec", "require_pac", false)) {
1383                         DEBUG(1, ("Unable to find PAC, resorting to local user lookup: %s\n",
1384                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1385                         nt_status = gensec_security->auth_context->get_user_info_dc_principal(mem_ctx,
1386                                                                                              gensec_security->auth_context,
1387                                                                                              principal_string,
1388                                                                                              NULL,
1389                                                                                              &user_info_dc);
1390
1391                         if (!NT_STATUS_IS_OK(nt_status)) {
1392                                 talloc_free(mem_ctx);
1393                                 return nt_status;
1394                         }
1395                 } else {
1396                         DEBUG(1, ("Unable to find PAC in ticket from %s, failing to allow access: %s\n",
1397                                   principal_string,
1398                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1399                         return NT_STATUS_ACCESS_DENIED;
1400                 }
1401         }
1402
1403         /* references the user_info_dc into the session_info */
1404         nt_status = gensec_generate_session_info(mem_ctx, gensec_security,
1405                                                  user_info_dc, &session_info);
1406         if (!NT_STATUS_IS_OK(nt_status)) {
1407                 talloc_free(mem_ctx);
1408                 return nt_status;
1409         }
1410
1411         nt_status = gensec_gssapi_session_key(gensec_security, session_info, &session_info->session_key);
1412         if (!NT_STATUS_IS_OK(nt_status)) {
1413                 talloc_free(mem_ctx);
1414                 return nt_status;
1415         }
1416
1417         /* Allow torture tests to check the PAC signatures */
1418         if (session_info->torture) {
1419                 session_info->torture->pac_srv_sig = talloc_steal(session_info->torture, pac_srv_sig);
1420                 session_info->torture->pac_kdc_sig = talloc_steal(session_info->torture, pac_kdc_sig);
1421         }
1422
1423         if (!(gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG)) {
1424                 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1425         } else {
1426                 krb5_error_code ret;
1427                 const char *error_string;
1428
1429                 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1430                 session_info->credentials = cli_credentials_init(session_info);
1431                 if (!session_info->credentials) {
1432                         talloc_free(mem_ctx);
1433                         return NT_STATUS_NO_MEMORY;
1434                 }
1435
1436                 cli_credentials_set_conf(session_info->credentials, gensec_security->settings->lp_ctx);
1437                 /* Just so we don't segfault trying to get at a username */
1438                 cli_credentials_set_anonymous(session_info->credentials);
1439
1440                 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1441                                                            gensec_security->settings->lp_ctx,
1442                                                            gensec_gssapi_state->delegated_cred_handle,
1443                                                            CRED_SPECIFIED, &error_string);
1444                 if (ret) {
1445                         talloc_free(mem_ctx);
1446                         DEBUG(2,("Failed to get gss creds: %s\n", error_string));
1447                         return NT_STATUS_NO_MEMORY;
1448                 }
1449
1450                 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1451                 cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
1452
1453                 /* It has been taken from this place... */
1454                 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1455         }
1456         *_session_info = talloc_steal(mem_ctx_out, session_info);
1457         talloc_free(mem_ctx);
1458
1459         return NT_STATUS_OK;
1460 }
1461
1462 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
1463 {
1464         struct gensec_gssapi_state *gensec_gssapi_state
1465                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1466         NTSTATUS status;
1467
1468         if (gensec_gssapi_state->sig_size) {
1469                 return gensec_gssapi_state->sig_size;
1470         }
1471
1472         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1473                 gensec_gssapi_state->sig_size = 45;
1474         } else {
1475                 gensec_gssapi_state->sig_size = 37;
1476         }
1477
1478         status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1479         if (!NT_STATUS_IS_OK(status)) {
1480                 return gensec_gssapi_state->sig_size;
1481         }
1482
1483         if (gensec_gssapi_state->lucid->protocol == 1) {
1484                 if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1485                         /*
1486                          * TODO: windows uses 76 here, but we don't know
1487                          *       gss_wrap works with aes keys yet
1488                          */
1489                         gensec_gssapi_state->sig_size = 76;
1490                 } else {
1491                         gensec_gssapi_state->sig_size = 28;
1492                 }
1493         } else if (gensec_gssapi_state->lucid->protocol == 0) {
1494                 switch (gensec_gssapi_state->lucid->rfc1964_kd.ctx_key.type) {
1495                 case KEYTYPE_DES:
1496                 case KEYTYPE_ARCFOUR:
1497                 case KEYTYPE_ARCFOUR_56:
1498                         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1499                                 gensec_gssapi_state->sig_size = 45;
1500                         } else {
1501                                 gensec_gssapi_state->sig_size = 37;
1502                         }
1503                         break;
1504                 case KEYTYPE_DES3:
1505                         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1506                                 gensec_gssapi_state->sig_size = 57;
1507                         } else {
1508                                 gensec_gssapi_state->sig_size = 49;
1509                         }
1510                         break;
1511                 }
1512         }
1513
1514         return gensec_gssapi_state->sig_size;
1515 }
1516
1517 static const char *gensec_gssapi_krb5_oids[] = {
1518         GENSEC_OID_KERBEROS5_OLD,
1519         GENSEC_OID_KERBEROS5,
1520         NULL
1521 };
1522
1523 static const char *gensec_gssapi_spnego_oids[] = {
1524         GENSEC_OID_SPNEGO,
1525         NULL
1526 };
1527
1528 /* As a server, this could in theory accept any GSSAPI mech */
1529 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1530         .name           = "gssapi_spnego",
1531         .sasl_name      = "GSS-SPNEGO",
1532         .auth_type      = DCERPC_AUTH_TYPE_SPNEGO,
1533         .oid            = gensec_gssapi_spnego_oids,
1534         .client_start   = gensec_gssapi_client_start,
1535         .server_start   = gensec_gssapi_server_start,
1536         .magic          = gensec_gssapi_magic,
1537         .update         = gensec_gssapi_update,
1538         .session_key    = gensec_gssapi_session_key,
1539         .session_info   = gensec_gssapi_session_info,
1540         .sign_packet    = gensec_gssapi_sign_packet,
1541         .check_packet   = gensec_gssapi_check_packet,
1542         .seal_packet    = gensec_gssapi_seal_packet,
1543         .unseal_packet  = gensec_gssapi_unseal_packet,
1544         .wrap           = gensec_gssapi_wrap,
1545         .unwrap         = gensec_gssapi_unwrap,
1546         .have_feature   = gensec_gssapi_have_feature,
1547         .enabled        = false,
1548         .kerberos       = true,
1549         .priority       = GENSEC_GSSAPI
1550 };
1551
1552 /* As a server, this could in theory accept any GSSAPI mech */
1553 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1554         .name           = "gssapi_krb5",
1555         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
1556         .oid            = gensec_gssapi_krb5_oids,
1557         .client_start   = gensec_gssapi_client_start,
1558         .server_start   = gensec_gssapi_server_start,
1559         .magic          = gensec_gssapi_magic,
1560         .update         = gensec_gssapi_update,
1561         .session_key    = gensec_gssapi_session_key,
1562         .session_info   = gensec_gssapi_session_info,
1563         .sig_size       = gensec_gssapi_sig_size,
1564         .sign_packet    = gensec_gssapi_sign_packet,
1565         .check_packet   = gensec_gssapi_check_packet,
1566         .seal_packet    = gensec_gssapi_seal_packet,
1567         .unseal_packet  = gensec_gssapi_unseal_packet,
1568         .wrap           = gensec_gssapi_wrap,
1569         .unwrap         = gensec_gssapi_unwrap,
1570         .have_feature   = gensec_gssapi_have_feature,
1571         .enabled        = true,
1572         .kerberos       = true,
1573         .priority       = GENSEC_GSSAPI
1574 };
1575
1576 /* As a server, this could in theory accept any GSSAPI mech */
1577 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1578         .name             = "gssapi_krb5_sasl",
1579         .sasl_name        = "GSSAPI",
1580         .client_start     = gensec_gssapi_sasl_client_start,
1581         .server_start     = gensec_gssapi_sasl_server_start,
1582         .update           = gensec_gssapi_update,
1583         .session_key      = gensec_gssapi_session_key,
1584         .session_info     = gensec_gssapi_session_info,
1585         .max_input_size   = gensec_gssapi_max_input_size,
1586         .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1587         .wrap             = gensec_gssapi_wrap,
1588         .unwrap           = gensec_gssapi_unwrap,
1589         .have_feature     = gensec_gssapi_have_feature,
1590         .enabled          = true,
1591         .kerberos         = true,
1592         .priority         = GENSEC_GSSAPI
1593 };
1594
1595 _PUBLIC_ NTSTATUS gensec_gssapi_init(void)
1596 {
1597         NTSTATUS ret;
1598
1599         ret = gensec_register(&gensec_gssapi_spnego_security_ops);
1600         if (!NT_STATUS_IS_OK(ret)) {
1601                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1602                         gensec_gssapi_spnego_security_ops.name));
1603                 return ret;
1604         }
1605
1606         ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1607         if (!NT_STATUS_IS_OK(ret)) {
1608                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1609                         gensec_gssapi_krb5_security_ops.name));
1610                 return ret;
1611         }
1612
1613         ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1614         if (!NT_STATUS_IS_OK(ret)) {
1615                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1616                         gensec_gssapi_sasl_krb5_security_ops.name));
1617                 return ret;
1618         }
1619
1620         return ret;
1621 }