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                                            struct tevent_context *ev)
 272 {
 273         struct gensec_gssapi_state *gensec_gssapi_state;
 274         struct gssapi_creds_container *gcc;
 275         struct cli_credentials *creds = gensec_get_credentials(gensec_security);
 276         const char *error_string;
 277         int ret;
 278
 279         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 280
 281         /* Only run this the first time the update() call is made */
 282         if (gensec_gssapi_state->client_cred) {
 283                 return NT_STATUS_OK;
 284         }
 285
 286         ret = cli_credentials_get_client_gss_creds(creds,
 287                                                    ev,
 288                                                    gensec_security->settings->lp_ctx, &gcc, &error_string);
 289         switch (ret) {
 290         case 0:
 291                 break;
 292         case EINVAL:
 293                 DEBUG(3, ("Cannot obtain client GSS credentials we need to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
 294                 return NT_STATUS_INVALID_PARAMETER;
 295         case KRB5KDC_ERR_PREAUTH_FAILED:
 296         case KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN:
 297                 DEBUG(1, ("Wrong username or password: %s\n", error_string));
 298                 return NT_STATUS_LOGON_FAILURE;
 299         case KRB5_KDC_UNREACH:
 300                 DEBUG(3, ("Cannot reach a KDC we require to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
 301                 return NT_STATUS_NO_LOGON_SERVERS;
 302         case KRB5_CC_NOTFOUND:
 303         case KRB5_CC_END:
 304                 DEBUG(2, ("Error obtaining ticket we require to contact %s: (possibly due to clock skew between us and the KDC) %s\n", gensec_gssapi_state->target_principal, error_string));
 305                 return NT_STATUS_TIME_DIFFERENCE_AT_DC;
 306         default:
 307                 DEBUG(1, ("Aquiring initiator credentials failed: %s\n", error_string));
 308                 return NT_STATUS_UNSUCCESSFUL;
 309         }
 310
 311         gensec_gssapi_state->client_cred = gcc;
 312         if (!talloc_reference(gensec_gssapi_state, gcc)) {
 313                 return NT_STATUS_NO_MEMORY;
 314         }
 315
 316         return NT_STATUS_OK;
 317 }
 318
 319 static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_security)
 320 {
 321         struct gensec_gssapi_state *gensec_gssapi_state;
 322         struct cli_credentials *creds = gensec_get_credentials(gensec_security);
 323         NTSTATUS nt_status;
 324         gss_buffer_desc name_token;
 325         gss_OID name_type;
 326         OM_uint32 maj_stat, min_stat;
 327         const char *hostname = gensec_get_target_hostname(gensec_security);
 328
 329         if (!hostname) {
 330                 DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
 331                 return NT_STATUS_INVALID_PARAMETER;
 332         }
 333         if (is_ipaddress(hostname)) {
 334                 DEBUG(2, ("Cannot do GSSAPI to an IP address\n"));
 335                 return NT_STATUS_INVALID_PARAMETER;
 336         }
 337         if (strcmp(hostname, "localhost") == 0) {
 338                 DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
 339                 return NT_STATUS_INVALID_PARAMETER;
 340         }
 341
 342         nt_status = gensec_gssapi_start(gensec_security);
 343         if (!NT_STATUS_IS_OK(nt_status)) {
 344                 return nt_status;
 345         }
 346
 347         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 348
 349         if (cli_credentials_get_impersonate_principal(creds)) {
 350                 gensec_gssapi_state->want_flags &= ~(GSS_C_DELEG_FLAG|GSS_C_DELEG_POLICY_FLAG);
 351         }
 352
 353         gensec_gssapi_state->target_principal = gensec_get_target_principal(gensec_security);
 354         if (gensec_gssapi_state->target_principal) {
 355                 name_type = GSS_C_NULL_OID;
 356         } else {
 357                 gensec_gssapi_state->target_principal = talloc_asprintf(gensec_gssapi_state, "%s/%s@%s",
 358                                             gensec_get_target_service(gensec_security),
 359                                             hostname, lpcfg_realm(gensec_security->settings->lp_ctx));
 360
 361                 name_type = GSS_C_NT_USER_NAME;
 362         }
 363         name_token.value  = discard_const_p(uint8_t, gensec_gssapi_state->target_principal);
 364         name_token.length = strlen(gensec_gssapi_state->target_principal);
 365
 366
 367         maj_stat = gss_import_name (&min_stat,
 368                                     &name_token,
 369                                     name_type,
 370                                     &gensec_gssapi_state->server_name);
 371         if (maj_stat) {
 372                 DEBUG(2, ("GSS Import name of %s failed: %s\n",
 373                           (char *)name_token.value,
 374                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 375                 return NT_STATUS_INVALID_PARAMETER;
 376         }
 377
 378         return NT_STATUS_OK;
 379 }
 380
 381 static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
 382 {
 383         NTSTATUS nt_status;
 384         struct gensec_gssapi_state *gensec_gssapi_state;
 385         nt_status = gensec_gssapi_client_start(gensec_security);
 386
 387         if (NT_STATUS_IS_OK(nt_status)) {
 388                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 389                 gensec_gssapi_state->sasl = true;
 390         }
 391         return nt_status;
 392 }
 393
 394
 395 /**
 396  * Check if the packet is one for this mechansim
 397  *
 398  * @param gensec_security GENSEC state
 399  * @param in The request, as a DATA_BLOB
 400  * @return Error, INVALID_PARAMETER if it's not a packet for us
 401  *                or NT_STATUS_OK if the packet is ok.
 402  */
 403
 404 static NTSTATUS gensec_gssapi_magic(struct gensec_security *gensec_security,
 405                                     const DATA_BLOB *in)
 406 {
 407         if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
 408                 return NT_STATUS_OK;
 409         } else {
 410                 return NT_STATUS_INVALID_PARAMETER;
 411         }
 412 }
 413
 414
 415 /**
 416  * Next state function for the GSSAPI GENSEC mechanism
 417  *
 418  * @param gensec_gssapi_state GSSAPI State
 419  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 420  * @param in The request, as a DATA_BLOB
 421  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 422  * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
 423  *                or NT_STATUS_OK if the user is authenticated.
 424  */
 425
 426 static NTSTATUS gensec_gssapi_update(struct gensec_security *gensec_security,
 427                                      TALLOC_CTX *out_mem_ctx,
 428                                      struct tevent_context *ev,
 429                                      const DATA_BLOB in, DATA_BLOB *out)
 430 {
 431         struct gensec_gssapi_state *gensec_gssapi_state
 432                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 433         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 434         OM_uint32 maj_stat, min_stat;
 435         OM_uint32 min_stat2;
 436         gss_buffer_desc input_token, output_token;
 437         gss_OID gss_oid_p = NULL;
 438         input_token.length = in.length;
 439         input_token.value = in.data;
 440
 441         switch (gensec_gssapi_state->sasl_state) {
 442         case STAGE_GSS_NEG:
 443         {
 444                 switch (gensec_security->gensec_role) {
 445                 case GENSEC_CLIENT:
 446                 {
 447                         struct gsskrb5_send_to_kdc send_to_kdc;
 448                         krb5_error_code ret;
 449
 450                         nt_status = gensec_gssapi_client_creds(gensec_security, ev);
 451                         if (!NT_STATUS_IS_OK(nt_status)) {
 452                                 return nt_status;
 453                         }
 454
 455                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 456                         send_to_kdc.ptr = ev;
 457
 458                         min_stat = gsskrb5_set_send_to_kdc(&send_to_kdc);
 459                         if (min_stat) {
 460                                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
 461                                 return NT_STATUS_INTERNAL_ERROR;
 462                         }
 463
 464                         maj_stat = gss_init_sec_context(&min_stat,
 465                                                         gensec_gssapi_state->client_cred->creds,
 466                                                         &gensec_gssapi_state->gssapi_context,
 467                                                         gensec_gssapi_state->server_name,
 468                                                         gensec_gssapi_state->gss_oid,
 469                                                         gensec_gssapi_state->want_flags,
 470                                                         0,
 471                                                         gensec_gssapi_state->input_chan_bindings,
 472                                                         &input_token,
 473                                                         &gss_oid_p,
 474                                                         &output_token,
 475                                                         &gensec_gssapi_state->got_flags, /* ret flags */
 476                                                         NULL);
 477                         if (gss_oid_p) {
 478                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 479                         }
 480
 481                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 482                         send_to_kdc.ptr = NULL;
 483
 484                         ret = gsskrb5_set_send_to_kdc(&send_to_kdc);
 485                         if (ret) {
 486                                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
 487                                 return NT_STATUS_INTERNAL_ERROR;
 488                         }
 489
 490                         break;
 491                 }
 492                 case GENSEC_SERVER:
 493                 {
 494                         maj_stat = gss_accept_sec_context(&min_stat,
 495                                                           &gensec_gssapi_state->gssapi_context,
 496                                                           gensec_gssapi_state->server_cred->creds,
 497                                                           &input_token,
 498                                                           gensec_gssapi_state->input_chan_bindings,
 499                                                           &gensec_gssapi_state->client_name,
 500                                                           &gss_oid_p,
 501                                                           &output_token,
 502                                                           &gensec_gssapi_state->got_flags,
 503                                                           NULL,
 504                                                           &gensec_gssapi_state->delegated_cred_handle);
 505                         if (gss_oid_p) {
 506                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 507                         }
 508                         break;
 509                 }
 510                 default:
 511                         return NT_STATUS_INVALID_PARAMETER;
 512
 513                 }
 514
 515                 gensec_gssapi_state->gss_exchange_count++;
 516
 517                 if (maj_stat == GSS_S_COMPLETE) {
 518                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 519                         gss_release_buffer(&min_stat2, &output_token);
 520
 521                         if (gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG) {
 522                                 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
 523                         } else {
 524                                 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
 525                         }
 526
 527                         /* We may have been invoked as SASL, so there
 528                          * is more work to do */
 529                         if (gensec_gssapi_state->sasl) {
 530                                 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
 531                                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 532                         } else {
 533                                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 534
 535                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 536                                         DEBUG(5, ("GSSAPI Connection will be cryptographically sealed\n"));
 537                                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 538                                         DEBUG(5, ("GSSAPI Connection will be cryptographically signed\n"));
 539                                 } else {
 540                                         DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
 541                                 }
 542
 543                                 return NT_STATUS_OK;
 544                         }
 545                 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
 546                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 547                         gss_release_buffer(&min_stat2, &output_token);
 548
 549                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 550                 } else if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
 551                         gss_cred_id_t creds;
 552                         gss_name_t name;
 553                         gss_buffer_desc buffer;
 554                         OM_uint32 lifetime = 0;
 555                         gss_cred_usage_t usage;
 556                         const char *role = NULL;
 557                         DEBUG(0, ("GSS %s Update(krb5)(%d) Update failed, credentials expired during GSSAPI handshake!\n",
 558                                   role,
 559                                   gensec_gssapi_state->gss_exchange_count));
 560
 561
 562                         switch (gensec_security->gensec_role) {
 563                         case GENSEC_CLIENT:
 564                                 creds = gensec_gssapi_state->client_cred->creds;
 565                                 role = "client";
 566                         case GENSEC_SERVER:
 567                                 creds = gensec_gssapi_state->server_cred->creds;
 568                                 role = "server";
 569                         }
 570
 571                         maj_stat = gss_inquire_cred(&min_stat,
 572                                                     creds,
 573                                                     &name, &lifetime, &usage, NULL);
 574
 575                         if (maj_stat == GSS_S_COMPLETE) {
 576                                 const char *usage_string;
 577                                 switch (usage) {
 578                                 case GSS_C_BOTH:
 579                                         usage_string = "GSS_C_BOTH";
 580                                         break;
 581                                 case GSS_C_ACCEPT:
 582                                         usage_string = "GSS_C_ACCEPT";
 583                                         break;
 584                                 case GSS_C_INITIATE:
 585                                         usage_string = "GSS_C_INITIATE";
 586                                         break;
 587                                 }
 588                                 maj_stat = gss_display_name(&min_stat, name, &buffer, NULL);
 589                                 if (maj_stat) {
 590                                         buffer.value = NULL;
 591                                         buffer.length = 0;
 592                                 }
 593                                 if (lifetime > 0) {
 594                                         DEBUG(0, ("GSSAPI gss_inquire_cred indicates expiry of %*.*s in %u sec for %s\n",
 595                                                   (int)buffer.length, (int)buffer.length, (char *)buffer.value,
 596                                                   lifetime, usage_string));
 597                                 } else {
 598                                         DEBUG(0, ("GSSAPI gss_inquire_cred indicates %*.*s has already expired for %s\n",
 599                                                   (int)buffer.length, (int)buffer.length, (char *)buffer.value,
 600                                                   usage_string));
 601                                 }
 602                                 gss_release_buffer(&min_stat, &buffer);
 603                                 gss_release_name(&min_stat, &name);
 604                         } else if (maj_stat != GSS_S_COMPLETE) {
 605                                 DEBUG(0, ("inquiry of credential lifefime via GSSAPI gss_inquire_cred failed: %s\n",
 606                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 607                         }
 608                         return NT_STATUS_INVALID_PARAMETER;
 609                 } else if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
 610                         switch (min_stat) {
 611                         case KRB5KRB_AP_ERR_TKT_NYV:
 612                                 DEBUG(1, ("Error with ticket to contact %s: possible clock skew between us and the KDC or target server: %s\n",
 613                                           gensec_gssapi_state->target_principal,
 614                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 615                                 return NT_STATUS_TIME_DIFFERENCE_AT_DC; /* Make SPNEGO ignore us, we can't go any further here */
 616                         case KRB5KRB_AP_ERR_TKT_EXPIRED:
 617                                 DEBUG(1, ("Error with ticket to contact %s: ticket is expired, possible clock skew between us and the KDC or target server: %s\n",
 618                                           gensec_gssapi_state->target_principal,
 619                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 620                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 621                         case KRB5_KDC_UNREACH:
 622                                 DEBUG(3, ("Cannot reach a KDC we require in order to obtain a ticetk to %s: %s\n",
 623                                           gensec_gssapi_state->target_principal,
 624                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 625                                 return NT_STATUS_NO_LOGON_SERVERS; /* Make SPNEGO ignore us, we can't go any further here */
 626                         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 627                                 DEBUG(3, ("Server %s is not registered with our KDC: %s\n",
 628                                           gensec_gssapi_state->target_principal,
 629                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 630                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 631                         case KRB5KRB_AP_ERR_MSG_TYPE:
 632                                 /* garbage input, possibly from the auto-mech detection */
 633                                 return NT_STATUS_INVALID_PARAMETER;
 634                         default:
 635                                 DEBUG(1, ("GSS %s Update(krb5)(%d) Update failed: %s\n",
 636                                           gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 637                                           gensec_gssapi_state->gss_exchange_count,
 638                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 639                                 return nt_status;
 640                         }
 641                 } else {
 642                         DEBUG(1, ("GSS %s Update(%d) failed: %s\n",
 643                                   gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 644                                   gensec_gssapi_state->gss_exchange_count,
 645                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 646                         return nt_status;
 647                 }
 648                 break;
 649         }
 650
 651         /* These last two stages are only done if we were invoked as SASL */
 652         case STAGE_SASL_SSF_NEG:
 653         {
 654                 switch (gensec_security->gensec_role) {
 655                 case GENSEC_CLIENT:
 656                 {
 657                         uint8_t maxlength_proposed[4];
 658                         uint8_t maxlength_accepted[4];
 659                         uint8_t security_supported;
 660                         int conf_state;
 661                         gss_qop_t qop_state;
 662                         input_token.length = in.length;
 663                         input_token.value = in.data;
 664
 665                         /* As a client, we have just send a
 666                          * zero-length blob to the server (after the
 667                          * normal GSSAPI exchange), and it has replied
 668                          * with it's SASL negotiation */
 669
 670                         maj_stat = gss_unwrap(&min_stat,
 671                                               gensec_gssapi_state->gssapi_context,
 672                                               &input_token,
 673                                               &output_token,
 674                                               &conf_state,
 675                                               &qop_state);
 676                         if (GSS_ERROR(maj_stat)) {
 677                                 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 678                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 679                                 return NT_STATUS_ACCESS_DENIED;
 680                         }
 681
 682                         if (output_token.length < 4) {
 683                                 return NT_STATUS_INVALID_PARAMETER;
 684                         }
 685
 686                         memcpy(maxlength_proposed, output_token.value, 4);
 687                         gss_release_buffer(&min_stat, &output_token);
 688
 689                         /* first byte is the proposed security */
 690                         security_supported = maxlength_proposed[0];
 691                         maxlength_proposed[0] = '\0';
 692
 693                         /* Rest is the proposed max wrap length */
 694                         gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
 695                                                                      gensec_gssapi_state->max_wrap_buf_size);
 696                         gensec_gssapi_state->sasl_protection = 0;
 697                         if (security_supported & NEG_SEAL) {
 698                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 699                                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 700                                 }
 701                         }
 702                         if (security_supported & NEG_SIGN) {
 703                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 704                                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 705                                 }
 706                         }
 707                         if (security_supported & NEG_NONE) {
 708                                 gensec_gssapi_state->sasl_protection |= NEG_NONE;
 709                         }
 710                         if (gensec_gssapi_state->sasl_protection == 0) {
 711                                 DEBUG(1, ("Remote server does not support unprotected connections\n"));
 712                                 return NT_STATUS_ACCESS_DENIED;
 713                         }
 714
 715                         /* Send back the negotiated max length */
 716
 717                         RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
 718
 719                         maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
 720
 721                         input_token.value = maxlength_accepted;
 722                         input_token.length = sizeof(maxlength_accepted);
 723
 724                         maj_stat = gss_wrap(&min_stat,
 725                                             gensec_gssapi_state->gssapi_context,
 726                                             false,
 727                                             GSS_C_QOP_DEFAULT,
 728                                             &input_token,
 729                                             &conf_state,
 730                                             &output_token);
 731                         if (GSS_ERROR(maj_stat)) {
 732                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 733                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 734                                 return NT_STATUS_ACCESS_DENIED;
 735                         }
 736
 737                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 738                         gss_release_buffer(&min_stat, &output_token);
 739
 740                         /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 741                         gensec_gssapi_state->sasl_state = STAGE_DONE;
 742
 743                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 744                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically sealed\n"));
 745                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 746                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically signed\n"));
 747                         } else {
 748                                 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographically protection\n"));
 749                         }
 750
 751                         return NT_STATUS_OK;
 752                 }
 753                 case GENSEC_SERVER:
 754                 {
 755                         uint8_t maxlength_proposed[4];
 756                         uint8_t security_supported = 0x0;
 757                         int conf_state;
 758
 759                         /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
 760                         if (in.length != 0) {
 761                                 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
 762                         }
 763
 764                         /* Give the client some idea what we will support */
 765
 766                         RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
 767                         /* first byte is the proposed security */
 768                         maxlength_proposed[0] = '\0';
 769
 770                         gensec_gssapi_state->sasl_protection = 0;
 771                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 772                                 security_supported |= NEG_SEAL;
 773                         }
 774                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 775                                 security_supported |= NEG_SIGN;
 776                         }
 777                         if (security_supported == 0) {
 778                                 /* If we don't support anything, this must be 0 */
 779                                 RSIVAL(maxlength_proposed, 0, 0x0);
 780                         }
 781
 782                         /* TODO:  We may not wish to support this */
 783                         security_supported |= NEG_NONE;
 784                         maxlength_proposed[0] = security_supported;
 785
 786                         input_token.value = maxlength_proposed;
 787                         input_token.length = sizeof(maxlength_proposed);
 788
 789                         maj_stat = gss_wrap(&min_stat,
 790                                             gensec_gssapi_state->gssapi_context,
 791                                             false,
 792                                             GSS_C_QOP_DEFAULT,
 793                                             &input_token,
 794                                             &conf_state,
 795                                             &output_token);
 796                         if (GSS_ERROR(maj_stat)) {
 797                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 798                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 799                                 return NT_STATUS_ACCESS_DENIED;
 800                         }
 801
 802                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 803                         gss_release_buffer(&min_stat, &output_token);
 804
 805                         gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
 806                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 807                 }
 808                 default:
 809                         return NT_STATUS_INVALID_PARAMETER;
 810
 811                 }
 812         }
 813         /* This is s server-only stage */
 814         case STAGE_SASL_SSF_ACCEPT:
 815         {
 816                 uint8_t maxlength_accepted[4];
 817                 uint8_t security_accepted;
 818                 int conf_state;
 819                 gss_qop_t qop_state;
 820                 input_token.length = in.length;
 821                 input_token.value = in.data;
 822
 823                 maj_stat = gss_unwrap(&min_stat,
 824                                       gensec_gssapi_state->gssapi_context,
 825                                       &input_token,
 826                                       &output_token,
 827                                       &conf_state,
 828                                       &qop_state);
 829                 if (GSS_ERROR(maj_stat)) {
 830                         DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 831                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 832                         return NT_STATUS_ACCESS_DENIED;
 833                 }
 834
 835                 if (output_token.length < 4) {
 836                         return NT_STATUS_INVALID_PARAMETER;
 837                 }
 838
 839                 memcpy(maxlength_accepted, output_token.value, 4);
 840                 gss_release_buffer(&min_stat, &output_token);
 841
 842                 /* first byte is the proposed security */
 843                 security_accepted = maxlength_accepted[0];
 844                 maxlength_accepted[0] = '\0';
 845
 846                 /* Rest is the proposed max wrap length */
 847                 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
 848                                                              gensec_gssapi_state->max_wrap_buf_size);
 849
 850                 gensec_gssapi_state->sasl_protection = 0;
 851                 if (security_accepted & NEG_SEAL) {
 852                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 853                                 DEBUG(1, ("Remote client wanted seal, but gensec refused\n"));
 854                                 return NT_STATUS_ACCESS_DENIED;
 855                         }
 856                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 857                 }
 858                 if (security_accepted & NEG_SIGN) {
 859                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 860                                 DEBUG(1, ("Remote client wanted sign, but gensec refused\n"));
 861                                 return NT_STATUS_ACCESS_DENIED;
 862                         }
 863                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 864                 }
 865                 if (security_accepted & NEG_NONE) {
 866                         gensec_gssapi_state->sasl_protection |= NEG_NONE;
 867                 }
 868
 869                 /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 870                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 871                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 872                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically sealed\n"));
 873                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 874                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically signed\n"));
 875                 } else {
 876                         DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
 877                 }
 878
 879                 *out = data_blob(NULL, 0);
 880                 return NT_STATUS_OK;
 881         }
 882         default:
 883                 return NT_STATUS_INVALID_PARAMETER;
 884         }
 885 }
 886
 887 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
 888                                    TALLOC_CTX *mem_ctx,
 889                                    const DATA_BLOB *in,
 890                                    DATA_BLOB *out)
 891 {
 892         struct gensec_gssapi_state *gensec_gssapi_state
 893                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 894         OM_uint32 maj_stat, min_stat;
 895         gss_buffer_desc input_token, output_token;
 896         int conf_state;
 897         input_token.length = in->length;
 898         input_token.value = in->data;
 899
 900         maj_stat = gss_wrap(&min_stat,
 901                             gensec_gssapi_state->gssapi_context,
 902                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 903                             GSS_C_QOP_DEFAULT,
 904                             &input_token,
 905                             &conf_state,
 906                             &output_token);
 907         if (GSS_ERROR(maj_stat)) {
 908                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 909                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 910                 return NT_STATUS_ACCESS_DENIED;
 911         }
 912
 913         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 914         gss_release_buffer(&min_stat, &output_token);
 915
 916         if (gensec_gssapi_state->sasl) {
 917                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 918                 if (max_wrapped_size < out->length) {
 919                         DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
 920                                   (unsigned)in->length,
 921                                   (unsigned)out->length,
 922                                   (unsigned int)max_wrapped_size));
 923                         return NT_STATUS_INVALID_PARAMETER;
 924                 }
 925         }
 926
 927         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 928             && !conf_state) {
 929                 return NT_STATUS_ACCESS_DENIED;
 930         }
 931         return NT_STATUS_OK;
 932 }
 933
 934 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
 935                                      TALLOC_CTX *mem_ctx,
 936                                      const DATA_BLOB *in,
 937                                      DATA_BLOB *out)
 938 {
 939         struct gensec_gssapi_state *gensec_gssapi_state
 940                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 941         OM_uint32 maj_stat, min_stat;
 942         gss_buffer_desc input_token, output_token;
 943         int conf_state;
 944         gss_qop_t qop_state;
 945         input_token.length = in->length;
 946         input_token.value = in->data;
 947
 948         if (gensec_gssapi_state->sasl) {
 949                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 950                 if (max_wrapped_size < in->length) {
 951                         DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
 952                         return NT_STATUS_INVALID_PARAMETER;
 953                 }
 954         }
 955
 956         maj_stat = gss_unwrap(&min_stat,
 957                               gensec_gssapi_state->gssapi_context,
 958                               &input_token,
 959                               &output_token,
 960                               &conf_state,
 961                               &qop_state);
 962         if (GSS_ERROR(maj_stat)) {
 963                 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
 964                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 965                 return NT_STATUS_ACCESS_DENIED;
 966         }
 967
 968         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 969         gss_release_buffer(&min_stat, &output_token);
 970
 971         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 972             && !conf_state) {
 973                 return NT_STATUS_ACCESS_DENIED;
 974         }
 975         return NT_STATUS_OK;
 976 }
 977
 978 /* Find out the maximum input size negotiated on this connection */
 979
 980 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
 981 {
 982         struct gensec_gssapi_state *gensec_gssapi_state
 983                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 984         OM_uint32 maj_stat, min_stat;
 985         OM_uint32 max_input_size;
 986
 987         maj_stat = gss_wrap_size_limit(&min_stat,
 988                                        gensec_gssapi_state->gssapi_context,
 989                                        gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 990                                        GSS_C_QOP_DEFAULT,
 991                                        gensec_gssapi_state->max_wrap_buf_size,
 992                                        &max_input_size);
 993         if (GSS_ERROR(maj_stat)) {
 994                 TALLOC_CTX *mem_ctx = talloc_new(NULL);
 995                 DEBUG(1, ("gensec_gssapi_max_input_size: determinaing signature size with gss_wrap_size_limit failed: %s\n",
 996                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 997                 talloc_free(mem_ctx);
 998                 return 0;
 999         }
1000
1001         return max_input_size;
1002 }
1003
1004 /* Find out the maximum output size negotiated on this connection */
1005 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
1006 {
1007         struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
1008         return gensec_gssapi_state->max_wrap_buf_size;
1009 }
1010
1011 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
1012                                           TALLOC_CTX *mem_ctx,
1013                                           uint8_t *data, size_t length,
1014                                           const uint8_t *whole_pdu, size_t pdu_length,
1015                                           DATA_BLOB *sig)
1016 {
1017         struct gensec_gssapi_state *gensec_gssapi_state
1018                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1019         OM_uint32 maj_stat, min_stat;
1020         gss_buffer_desc input_token, output_token;
1021         int conf_state;
1022         ssize_t sig_length;
1023
1024         input_token.length = length;
1025         input_token.value = data;
1026
1027         maj_stat = gss_wrap(&min_stat,
1028                             gensec_gssapi_state->gssapi_context,
1029                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
1030                             GSS_C_QOP_DEFAULT,
1031                             &input_token,
1032                             &conf_state,
1033                             &output_token);
1034         if (GSS_ERROR(maj_stat)) {
1035                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
1036                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1037                 return NT_STATUS_ACCESS_DENIED;
1038         }
1039
1040         if (output_token.length < input_token.length) {
1041                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
1042                           (long)output_token.length, (long)length));
1043                 return NT_STATUS_INTERNAL_ERROR;
1044         }
1045         sig_length = output_token.length - input_token.length;
1046
1047         memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
1048         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
1049
1050         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1051         dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
1052         dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
1053
1054         gss_release_buffer(&min_stat, &output_token);
1055
1056         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1057             && !conf_state) {
1058                 return NT_STATUS_ACCESS_DENIED;
1059         }
1060         return NT_STATUS_OK;
1061 }
1062
1063 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
1064                                             uint8_t *data, size_t length,
1065                                             const uint8_t *whole_pdu, size_t pdu_length,
1066                                             const DATA_BLOB *sig)
1067 {
1068         struct gensec_gssapi_state *gensec_gssapi_state
1069                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1070         OM_uint32 maj_stat, min_stat;
1071         gss_buffer_desc input_token, output_token;
1072         int conf_state;
1073         gss_qop_t qop_state;
1074         DATA_BLOB in;
1075
1076         dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
1077
1078         in = data_blob_talloc(gensec_security, NULL, sig->length + length);
1079
1080         memcpy(in.data, sig->data, sig->length);
1081         memcpy(in.data + sig->length, data, length);
1082
1083         input_token.length = in.length;
1084         input_token.value = in.data;
1085
1086         maj_stat = gss_unwrap(&min_stat,
1087                               gensec_gssapi_state->gssapi_context,
1088                               &input_token,
1089                               &output_token,
1090                               &conf_state,
1091                               &qop_state);
1092         talloc_free(in.data);
1093         if (GSS_ERROR(maj_stat)) {
1094                 char *error_string = gssapi_error_string(NULL, maj_stat, min_stat, gensec_gssapi_state->gss_oid);
1095                 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
1096                           error_string));
1097                 talloc_free(error_string);
1098                 return NT_STATUS_ACCESS_DENIED;
1099         }
1100
1101         if (output_token.length != length) {
1102                 return NT_STATUS_INTERNAL_ERROR;
1103         }
1104
1105         memcpy(data, output_token.value, length);
1106
1107         gss_release_buffer(&min_stat, &output_token);
1108
1109         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1110             && !conf_state) {
1111                 return NT_STATUS_ACCESS_DENIED;
1112         }
1113         return NT_STATUS_OK;
1114 }
1115
1116 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1117                                           TALLOC_CTX *mem_ctx,
1118                                           const uint8_t *data, size_t length,
1119                                           const uint8_t *whole_pdu, size_t pdu_length,
1120                                           DATA_BLOB *sig)
1121 {
1122         struct gensec_gssapi_state *gensec_gssapi_state
1123                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1124         OM_uint32 maj_stat, min_stat;
1125         gss_buffer_desc input_token, output_token;
1126
1127         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1128                 input_token.length = pdu_length;
1129                 input_token.value = discard_const_p(uint8_t *, whole_pdu);
1130         } else {
1131                 input_token.length = length;
1132                 input_token.value = discard_const_p(uint8_t *, data);
1133         }
1134
1135         maj_stat = gss_get_mic(&min_stat,
1136                             gensec_gssapi_state->gssapi_context,
1137                             GSS_C_QOP_DEFAULT,
1138                             &input_token,
1139                             &output_token);
1140         if (GSS_ERROR(maj_stat)) {
1141                 DEBUG(1, ("GSS GetMic failed: %s\n",
1142                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1143                 return NT_STATUS_ACCESS_DENIED;
1144         }
1145
1146         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, output_token.length);
1147
1148         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1149
1150         gss_release_buffer(&min_stat, &output_token);
1151
1152         return NT_STATUS_OK;
1153 }
1154
1155 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1156                                            const uint8_t *data, size_t length,
1157                                            const uint8_t *whole_pdu, size_t pdu_length,
1158                                            const DATA_BLOB *sig)
1159 {
1160         struct gensec_gssapi_state *gensec_gssapi_state
1161                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1162         OM_uint32 maj_stat, min_stat;
1163         gss_buffer_desc input_token;
1164         gss_buffer_desc input_message;
1165         gss_qop_t qop_state;
1166
1167         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1168
1169         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1170                 input_message.length = pdu_length;
1171                 input_message.value = discard_const(whole_pdu);
1172         } else {
1173                 input_message.length = length;
1174                 input_message.value = discard_const(data);
1175         }
1176
1177         input_token.length = sig->length;
1178         input_token.value = sig->data;
1179
1180         maj_stat = gss_verify_mic(&min_stat,
1181                               gensec_gssapi_state->gssapi_context,
1182                               &input_message,
1183                               &input_token,
1184                               &qop_state);
1185         if (GSS_ERROR(maj_stat)) {
1186                 char *error_string = gssapi_error_string(NULL, maj_stat, min_stat, gensec_gssapi_state->gss_oid);
1187                 DEBUG(1, ("GSS VerifyMic failed: %s\n", error_string));
1188                 talloc_free(error_string);
1189
1190                 return NT_STATUS_ACCESS_DENIED;
1191         }
1192
1193         return NT_STATUS_OK;
1194 }
1195
1196 /* Try to figure out what features we actually got on the connection */
1197 static bool gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1198                                        uint32_t feature)
1199 {
1200         struct gensec_gssapi_state *gensec_gssapi_state
1201                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1202         if (feature & GENSEC_FEATURE_SIGN) {
1203                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1204                 if (gensec_gssapi_state->sasl
1205                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1206                         return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1207                                 && (gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG));
1208                 }
1209                 return gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG;
1210         }
1211         if (feature & GENSEC_FEATURE_SEAL) {
1212                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1213                 if (gensec_gssapi_state->sasl
1214                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1215                         return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1216                                  && (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG));
1217                 }
1218                 return gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG;
1219         }
1220         if (feature & GENSEC_FEATURE_SESSION_KEY) {
1221                 /* Only for GSSAPI/Krb5 */
1222                 if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
1223                         return true;
1224                 }
1225         }
1226         if (feature & GENSEC_FEATURE_DCE_STYLE) {
1227                 return gensec_gssapi_state->got_flags & GSS_C_DCE_STYLE;
1228         }
1229         if (feature & GENSEC_FEATURE_NEW_SPNEGO) {
1230                 NTSTATUS status;
1231
1232                 if (!(gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG)) {
1233                         return false;
1234                 }
1235
1236                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "force_new_spnego", false)) {
1237                         return true;
1238                 }
1239                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "disable_new_spnego", false)) {
1240                         return false;
1241                 }
1242
1243                 status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1244                 if (!NT_STATUS_IS_OK(status)) {
1245                         return false;
1246                 }
1247
1248                 if (gensec_gssapi_state->lucid->protocol == 1) {
1249                         return true;
1250                 }
1251
1252                 return false;
1253         }
1254         /* We can always do async (rather than strict request/reply) packets.  */
1255         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1256                 return true;
1257         }
1258         return false;
1259 }
1260
1261 /*
1262  * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1263  * (for encrypting some passwords).
1264  *
1265  * This breaks all the abstractions, but what do you expect...
1266  */
1267 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1268                                           TALLOC_CTX *mem_ctx,
1269                                           DATA_BLOB *session_key)
1270 {
1271         struct gensec_gssapi_state *gensec_gssapi_state
1272                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1273         OM_uint32 maj_stat, min_stat;
1274         krb5_keyblock *subkey;
1275
1276         if (gensec_gssapi_state->sasl_state != STAGE_DONE) {
1277                 return NT_STATUS_NO_USER_SESSION_KEY;
1278         }
1279
1280         maj_stat = gsskrb5_get_subkey(&min_stat,
1281                                       gensec_gssapi_state->gssapi_context,
1282                                       &subkey);
1283         if (maj_stat != 0) {
1284                 DEBUG(1, ("NO session key for this mech\n"));
1285                 return NT_STATUS_NO_USER_SESSION_KEY;
1286         }
1287
1288         DEBUG(10, ("Got KRB5 session key of length %d%s\n",
1289                    (int)KRB5_KEY_LENGTH(subkey),
1290                    (gensec_gssapi_state->sasl_state == STAGE_DONE)?" (done)":""));
1291         *session_key = data_blob_talloc(mem_ctx,
1292                                         KRB5_KEY_DATA(subkey), KRB5_KEY_LENGTH(subkey));
1293         krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context, subkey);
1294         dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
1295
1296         return NT_STATUS_OK;
1297 }
1298
1299 /* Get some basic (and authorization) information about the user on
1300  * this session.  This uses either the PAC (if present) or a local
1301  * database lookup */
1302 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1303                                            TALLOC_CTX *mem_ctx_out,
1304                                            struct auth_session_info **_session_info)
1305 {
1306         NTSTATUS nt_status;
1307         TALLOC_CTX *mem_ctx;
1308         struct gensec_gssapi_state *gensec_gssapi_state
1309                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1310         struct auth_user_info_dc *user_info_dc = NULL;
1311         struct auth_session_info *session_info = NULL;
1312         OM_uint32 maj_stat, min_stat;
1313         DATA_BLOB pac_blob;
1314         struct PAC_SIGNATURE_DATA *pac_srv_sig = NULL;
1315         struct PAC_SIGNATURE_DATA *pac_kdc_sig = NULL;
1316
1317         if ((gensec_gssapi_state->gss_oid->length != gss_mech_krb5->length)
1318             || (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
1319                        gensec_gssapi_state->gss_oid->length) != 0)) {
1320                 DEBUG(1, ("NO session info available for this mech\n"));
1321                 return NT_STATUS_INVALID_PARAMETER;
1322         }
1323
1324         mem_ctx = talloc_named(mem_ctx_out, 0, "gensec_gssapi_session_info context");
1325         NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
1326
1327         nt_status = gssapi_obtain_pac_blob(mem_ctx,  gensec_gssapi_state->gssapi_context,
1328                                            gensec_gssapi_state->client_name,
1329                                            &pac_blob);
1330
1331         /* IF we have the PAC - otherwise we need to get this
1332          * data from elsewere - local ldb, or (TODO) lookup of some
1333          * kind...
1334          */
1335         if (NT_STATUS_IS_OK(nt_status)) {
1336                 pac_srv_sig = talloc(mem_ctx, struct PAC_SIGNATURE_DATA);
1337                 if (!pac_srv_sig) {
1338                         talloc_free(mem_ctx);
1339                         return NT_STATUS_NO_MEMORY;
1340                 }
1341                 pac_kdc_sig = talloc(mem_ctx, struct PAC_SIGNATURE_DATA);
1342                 if (!pac_kdc_sig) {
1343                         talloc_free(mem_ctx);
1344                         return NT_STATUS_NO_MEMORY;
1345                 }
1346
1347                 nt_status = kerberos_pac_blob_to_user_info_dc(mem_ctx,
1348                                                               pac_blob,
1349                                                               gensec_gssapi_state->smb_krb5_context->krb5_context,
1350                                                               &user_info_dc,
1351                                                               pac_srv_sig,
1352                                                               pac_kdc_sig);
1353                 if (!NT_STATUS_IS_OK(nt_status)) {
1354                         talloc_free(mem_ctx);
1355                         return nt_status;
1356                 }
1357         } else {
1358                 gss_buffer_desc name_token;
1359                 char *principal_string;
1360
1361                 maj_stat = gss_display_name (&min_stat,
1362                                              gensec_gssapi_state->client_name,
1363                                              &name_token,
1364                                              NULL);
1365                 if (GSS_ERROR(maj_stat)) {
1366                         DEBUG(1, ("GSS display_name failed: %s\n",
1367                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1368                         talloc_free(mem_ctx);
1369                         return NT_STATUS_FOOBAR;
1370                 }
1371
1372                 principal_string = talloc_strndup(mem_ctx,
1373                                                   (const char *)name_token.value,
1374                                                   name_token.length);
1375
1376                 gss_release_buffer(&min_stat, &name_token);
1377
1378                 if (!principal_string) {
1379                         talloc_free(mem_ctx);
1380                         return NT_STATUS_NO_MEMORY;
1381                 }
1382
1383                 if (gensec_security->auth_context &&
1384                     !gensec_setting_bool(gensec_security->settings, "gensec", "require_pac", false)) {
1385                         DEBUG(1, ("Unable to find PAC, resorting to local user lookup: %s\n",
1386                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1387                         nt_status = gensec_security->auth_context->get_user_info_dc_principal(mem_ctx,
1388                                                                                              gensec_security->auth_context,
1389                                                                                              principal_string,
1390                                                                                              NULL,
1391                                                                                              &user_info_dc);
1392
1393                         if (!NT_STATUS_IS_OK(nt_status)) {
1394                                 talloc_free(mem_ctx);
1395                                 return nt_status;
1396                         }
1397                 } else {
1398                         DEBUG(1, ("Unable to find PAC in ticket from %s, failing to allow access: %s\n",
1399                                   principal_string,
1400                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1401                         return NT_STATUS_ACCESS_DENIED;
1402                 }
1403         }
1404
1405         /* references the user_info_dc into the session_info */
1406         nt_status = gensec_generate_session_info(mem_ctx, gensec_security,
1407                                                  user_info_dc, &session_info);
1408         if (!NT_STATUS_IS_OK(nt_status)) {
1409                 talloc_free(mem_ctx);
1410                 return nt_status;
1411         }
1412
1413         nt_status = gensec_gssapi_session_key(gensec_security, session_info, &session_info->session_key);
1414         if (!NT_STATUS_IS_OK(nt_status)) {
1415                 talloc_free(mem_ctx);
1416                 return nt_status;
1417         }
1418
1419         /* Allow torture tests to check the PAC signatures */
1420         if (session_info->torture) {
1421                 session_info->torture->pac_srv_sig = talloc_steal(session_info->torture, pac_srv_sig);
1422                 session_info->torture->pac_kdc_sig = talloc_steal(session_info->torture, pac_kdc_sig);
1423         }
1424
1425         if (!(gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG)) {
1426                 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1427         } else {
1428                 krb5_error_code ret;
1429                 const char *error_string;
1430
1431                 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1432                 session_info->credentials = cli_credentials_init(session_info);
1433                 if (!session_info->credentials) {
1434                         talloc_free(mem_ctx);
1435                         return NT_STATUS_NO_MEMORY;
1436                 }
1437
1438                 cli_credentials_set_conf(session_info->credentials, gensec_security->settings->lp_ctx);
1439                 /* Just so we don't segfault trying to get at a username */
1440                 cli_credentials_set_anonymous(session_info->credentials);
1441
1442                 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1443                                                            gensec_security->settings->lp_ctx,
1444                                                            gensec_gssapi_state->delegated_cred_handle,
1445                                                            CRED_SPECIFIED, &error_string);
1446                 if (ret) {
1447                         talloc_free(mem_ctx);
1448                         DEBUG(2,("Failed to get gss creds: %s\n", error_string));
1449                         return NT_STATUS_NO_MEMORY;
1450                 }
1451
1452                 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1453                 cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
1454
1455                 /* It has been taken from this place... */
1456                 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1457         }
1458         *_session_info = talloc_steal(mem_ctx_out, session_info);
1459         talloc_free(mem_ctx);
1460
1461         return NT_STATUS_OK;
1462 }
1463
1464 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
1465 {
1466         struct gensec_gssapi_state *gensec_gssapi_state
1467                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1468         NTSTATUS status;
1469
1470         if (gensec_gssapi_state->sig_size) {
1471                 return gensec_gssapi_state->sig_size;
1472         }
1473
1474         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1475                 gensec_gssapi_state->sig_size = 45;
1476         } else {
1477                 gensec_gssapi_state->sig_size = 37;
1478         }
1479
1480         status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1481         if (!NT_STATUS_IS_OK(status)) {
1482                 return gensec_gssapi_state->sig_size;
1483         }
1484
1485         if (gensec_gssapi_state->lucid->protocol == 1) {
1486                 if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1487                         /*
1488                          * TODO: windows uses 76 here, but we don't know
1489                          *       gss_wrap works with aes keys yet
1490                          */
1491                         gensec_gssapi_state->sig_size = 76;
1492                 } else {
1493                         gensec_gssapi_state->sig_size = 28;
1494                 }
1495         } else if (gensec_gssapi_state->lucid->protocol == 0) {
1496                 switch (gensec_gssapi_state->lucid->rfc1964_kd.ctx_key.type) {
1497                 case KEYTYPE_DES:
1498                 case KEYTYPE_ARCFOUR:
1499                 case KEYTYPE_ARCFOUR_56:
1500                         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1501                                 gensec_gssapi_state->sig_size = 45;
1502                         } else {
1503                                 gensec_gssapi_state->sig_size = 37;
1504                         }
1505                         break;
1506                 case KEYTYPE_DES3:
1507                         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1508                                 gensec_gssapi_state->sig_size = 57;
1509                         } else {
1510                                 gensec_gssapi_state->sig_size = 49;
1511                         }
1512                         break;
1513                 }
1514         }
1515
1516         return gensec_gssapi_state->sig_size;
1517 }
1518
1519 static const char *gensec_gssapi_krb5_oids[] = {
1520         GENSEC_OID_KERBEROS5_OLD,
1521         GENSEC_OID_KERBEROS5,
1522         NULL
1523 };
1524
1525 static const char *gensec_gssapi_spnego_oids[] = {
1526         GENSEC_OID_SPNEGO,
1527         NULL
1528 };
1529
1530 /* As a server, this could in theory accept any GSSAPI mech */
1531 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1532         .name           = "gssapi_spnego",
1533         .sasl_name      = "GSS-SPNEGO",
1534         .auth_type      = DCERPC_AUTH_TYPE_SPNEGO,
1535         .oid            = gensec_gssapi_spnego_oids,
1536         .client_start   = gensec_gssapi_client_start,
1537         .server_start   = gensec_gssapi_server_start,
1538         .magic          = gensec_gssapi_magic,
1539         .update         = gensec_gssapi_update,
1540         .session_key    = gensec_gssapi_session_key,
1541         .session_info   = gensec_gssapi_session_info,
1542         .sign_packet    = gensec_gssapi_sign_packet,
1543         .check_packet   = gensec_gssapi_check_packet,
1544         .seal_packet    = gensec_gssapi_seal_packet,
1545         .unseal_packet  = gensec_gssapi_unseal_packet,
1546         .wrap           = gensec_gssapi_wrap,
1547         .unwrap         = gensec_gssapi_unwrap,
1548         .have_feature   = gensec_gssapi_have_feature,
1549         .enabled        = false,
1550         .kerberos       = true,
1551         .priority       = GENSEC_GSSAPI
1552 };
1553
1554 /* As a server, this could in theory accept any GSSAPI mech */
1555 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1556         .name           = "gssapi_krb5",
1557         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
1558         .oid            = gensec_gssapi_krb5_oids,
1559         .client_start   = gensec_gssapi_client_start,
1560         .server_start   = gensec_gssapi_server_start,
1561         .magic          = gensec_gssapi_magic,
1562         .update         = gensec_gssapi_update,
1563         .session_key    = gensec_gssapi_session_key,
1564         .session_info   = gensec_gssapi_session_info,
1565         .sig_size       = gensec_gssapi_sig_size,
1566         .sign_packet    = gensec_gssapi_sign_packet,
1567         .check_packet   = gensec_gssapi_check_packet,
1568         .seal_packet    = gensec_gssapi_seal_packet,
1569         .unseal_packet  = gensec_gssapi_unseal_packet,
1570         .wrap           = gensec_gssapi_wrap,
1571         .unwrap         = gensec_gssapi_unwrap,
1572         .have_feature   = gensec_gssapi_have_feature,
1573         .enabled        = true,
1574         .kerberos       = true,
1575         .priority       = GENSEC_GSSAPI
1576 };
1577
1578 /* As a server, this could in theory accept any GSSAPI mech */
1579 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1580         .name             = "gssapi_krb5_sasl",
1581         .sasl_name        = "GSSAPI",
1582         .client_start     = gensec_gssapi_sasl_client_start,
1583         .server_start     = gensec_gssapi_sasl_server_start,
1584         .update           = gensec_gssapi_update,
1585         .session_key      = gensec_gssapi_session_key,
1586         .session_info     = gensec_gssapi_session_info,
1587         .max_input_size   = gensec_gssapi_max_input_size,
1588         .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1589         .wrap             = gensec_gssapi_wrap,
1590         .unwrap           = gensec_gssapi_unwrap,
1591         .have_feature     = gensec_gssapi_have_feature,
1592         .enabled          = true,
1593         .kerberos         = true,
1594         .priority         = GENSEC_GSSAPI
1595 };
1596
1597 _PUBLIC_ NTSTATUS gensec_gssapi_init(void)
1598 {
1599         NTSTATUS ret;
1600
1601         ret = gensec_register(&gensec_gssapi_spnego_security_ops);
1602         if (!NT_STATUS_IS_OK(ret)) {
1603                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1604                         gensec_gssapi_spnego_security_ops.name));
1605                 return ret;
1606         }
1607
1608         ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1609         if (!NT_STATUS_IS_OK(ret)) {
1610                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1611                         gensec_gssapi_krb5_security_ops.name));
1612                 return ret;
1613         }
1614
1615         ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1616         if (!NT_STATUS_IS_OK(ret)) {
1617                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1618                         gensec_gssapi_sasl_krb5_security_ops.name));
1619                 return ret;
1620         }
1621
1622         return ret;
1623 }