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         gensec_gssapi_state->session_key = data_blob(NULL, 0);
 173         gensec_gssapi_state->pac = data_blob(NULL, 0);
 174
 175         ret = smb_krb5_init_context(gensec_gssapi_state,
 176                                     NULL,
 177                                     gensec_security->settings->lp_ctx,
 178                                     &gensec_gssapi_state->smb_krb5_context);
 179         if (ret) {
 180                 DEBUG(1,("gensec_krb5_start: krb5_init_context failed (%s)\n",
 181                          error_message(ret)));
 182                 talloc_free(gensec_gssapi_state);
 183                 return NT_STATUS_INTERNAL_ERROR;
 184         }
 185
 186         gensec_gssapi_state->client_cred = NULL;
 187         gensec_gssapi_state->server_cred = NULL;
 188
 189         gensec_gssapi_state->lucid = NULL;
 190
 191         gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
 192
 193         gensec_gssapi_state->sasl = false;
 194         gensec_gssapi_state->sasl_state = STAGE_GSS_NEG;
 195         gensec_gssapi_state->sasl_protection = 0;
 196
 197         gensec_gssapi_state->max_wrap_buf_size
 198                 = gensec_setting_int(gensec_security->settings, "gensec_gssapi", "max wrap buf size", 65536);
 199         gensec_gssapi_state->gss_exchange_count = 0;
 200         gensec_gssapi_state->sig_size = 0;
 201
 202         talloc_set_destructor(gensec_gssapi_state, gensec_gssapi_destructor);
 203
 204         realm = lpcfg_realm(gensec_security->settings->lp_ctx);
 205         if (realm != NULL) {
 206                 ret = gsskrb5_set_default_realm(realm);
 207                 if (ret) {
 208                         DEBUG(1,("gensec_krb5_start: gsskrb5_set_default_realm failed\n"));
 209                         talloc_free(gensec_gssapi_state);
 210                         return NT_STATUS_INTERNAL_ERROR;
 211                 }
 212         }
 213
 214         /* don't do DNS lookups of any kind, it might/will fail for a netbios name */
 215         ret = gsskrb5_set_dns_canonicalize(gensec_setting_bool(gensec_security->settings, "krb5", "set_dns_canonicalize", false));
 216         if (ret) {
 217                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_dns_canonicalize failed\n"));
 218                 talloc_free(gensec_gssapi_state);
 219                 return NT_STATUS_INTERNAL_ERROR;
 220         }
 221
 222         return NT_STATUS_OK;
 223 }
 224
 225 static NTSTATUS gensec_gssapi_server_start(struct gensec_security *gensec_security)
 226 {
 227         NTSTATUS nt_status;
 228         int ret;
 229         struct gensec_gssapi_state *gensec_gssapi_state;
 230         struct cli_credentials *machine_account;
 231         struct gssapi_creds_container *gcc;
 232
 233         nt_status = gensec_gssapi_start(gensec_security);
 234         if (!NT_STATUS_IS_OK(nt_status)) {
 235                 return nt_status;
 236         }
 237
 238         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 239
 240         machine_account = gensec_get_credentials(gensec_security);
 241
 242         if (!machine_account) {
 243                 DEBUG(3, ("No machine account credentials specified\n"));
 244                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 245         } else {
 246                 ret = cli_credentials_get_server_gss_creds(machine_account,
 247                                                            gensec_security->settings->lp_ctx, &gcc);
 248                 if (ret) {
 249                         DEBUG(1, ("Aquiring acceptor credentials failed: %s\n",
 250                                   error_message(ret)));
 251                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 252                 }
 253         }
 254
 255         gensec_gssapi_state->server_cred = gcc;
 256         return NT_STATUS_OK;
 257
 258 }
 259
 260 static NTSTATUS gensec_gssapi_sasl_server_start(struct gensec_security *gensec_security)
 261 {
 262         NTSTATUS nt_status;
 263         struct gensec_gssapi_state *gensec_gssapi_state;
 264         nt_status = gensec_gssapi_server_start(gensec_security);
 265
 266         if (NT_STATUS_IS_OK(nt_status)) {
 267                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 268                 gensec_gssapi_state->sasl = true;
 269         }
 270         return nt_status;
 271 }
 272
 273 static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_security)
 274 {
 275         struct gensec_gssapi_state *gensec_gssapi_state;
 276         struct cli_credentials *creds = gensec_get_credentials(gensec_security);
 277         krb5_error_code ret;
 278         NTSTATUS nt_status;
 279         gss_buffer_desc name_token;
 280         gss_OID name_type;
 281         OM_uint32 maj_stat, min_stat;
 282         const char *hostname = gensec_get_target_hostname(gensec_security);
 283         struct gssapi_creds_container *gcc;
 284         const char *error_string;
 285
 286         if (!hostname) {
 287                 DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
 288                 return NT_STATUS_INVALID_PARAMETER;
 289         }
 290         if (is_ipaddress(hostname)) {
 291                 DEBUG(2, ("Cannot do GSSAPI to an IP address\n"));
 292                 return NT_STATUS_INVALID_PARAMETER;
 293         }
 294         if (strcmp(hostname, "localhost") == 0) {
 295                 DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
 296                 return NT_STATUS_INVALID_PARAMETER;
 297         }
 298
 299         nt_status = gensec_gssapi_start(gensec_security);
 300         if (!NT_STATUS_IS_OK(nt_status)) {
 301                 return nt_status;
 302         }
 303
 304         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 305
 306         if (cli_credentials_get_impersonate_principal(creds)) {
 307                 gensec_gssapi_state->want_flags &= ~(GSS_C_DELEG_FLAG|GSS_C_DELEG_POLICY_FLAG);
 308         }
 309
 310         gensec_gssapi_state->target_principal = gensec_get_target_principal(gensec_security);
 311         if (gensec_gssapi_state->target_principal) {
 312                 name_type = GSS_C_NULL_OID;
 313         } else {
 314                 gensec_gssapi_state->target_principal = talloc_asprintf(gensec_gssapi_state, "%s/%s@%s",
 315                                             gensec_get_target_service(gensec_security),
 316                                             hostname, lpcfg_realm(gensec_security->settings->lp_ctx));
 317
 318                 name_type = GSS_C_NT_USER_NAME;
 319         }
 320         name_token.value  = discard_const_p(uint8_t, gensec_gssapi_state->target_principal);
 321         name_token.length = strlen(gensec_gssapi_state->target_principal);
 322
 323
 324         maj_stat = gss_import_name (&min_stat,
 325                                     &name_token,
 326                                     name_type,
 327                                     &gensec_gssapi_state->server_name);
 328         if (maj_stat) {
 329                 DEBUG(2, ("GSS Import name of %s failed: %s\n",
 330                           (char *)name_token.value,
 331                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 332                 return NT_STATUS_INVALID_PARAMETER;
 333         }
 334
 335         ret = cli_credentials_get_client_gss_creds(creds,
 336                                                    gensec_security->event_ctx,
 337                                                    gensec_security->settings->lp_ctx, &gcc, &error_string);
 338         switch (ret) {
 339         case 0:
 340                 break;
 341         case KRB5KDC_ERR_PREAUTH_FAILED:
 342         case KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN:
 343                 DEBUG(1, ("Wrong username or password: %s\n", error_string));
 344                 return NT_STATUS_LOGON_FAILURE;
 345         case KRB5_KDC_UNREACH:
 346                 DEBUG(3, ("Cannot reach a KDC we require to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
 347                 return NT_STATUS_NO_LOGON_SERVERS;
 348         case KRB5_CC_NOTFOUND:
 349         case KRB5_CC_END:
 350                 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));
 351                 return NT_STATUS_TIME_DIFFERENCE_AT_DC;
 352         default:
 353                 DEBUG(1, ("Aquiring initiator credentials failed: %s\n", error_string));
 354                 return NT_STATUS_UNSUCCESSFUL;
 355         }
 356
 357         gensec_gssapi_state->client_cred = gcc;
 358         if (!talloc_reference(gensec_gssapi_state, gcc)) {
 359                 return NT_STATUS_NO_MEMORY;
 360         }
 361
 362         return NT_STATUS_OK;
 363 }
 364
 365 static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
 366 {
 367         NTSTATUS nt_status;
 368         struct gensec_gssapi_state *gensec_gssapi_state;
 369         nt_status = gensec_gssapi_client_start(gensec_security);
 370
 371         if (NT_STATUS_IS_OK(nt_status)) {
 372                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 373                 gensec_gssapi_state->sasl = true;
 374         }
 375         return nt_status;
 376 }
 377
 378
 379 /**
 380  * Check if the packet is one for this mechansim
 381  *
 382  * @param gensec_security GENSEC state
 383  * @param in The request, as a DATA_BLOB
 384  * @return Error, INVALID_PARAMETER if it's not a packet for us
 385  *                or NT_STATUS_OK if the packet is ok.
 386  */
 387
 388 static NTSTATUS gensec_gssapi_magic(struct gensec_security *gensec_security,
 389                                     const DATA_BLOB *in)
 390 {
 391         if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
 392                 return NT_STATUS_OK;
 393         } else {
 394                 return NT_STATUS_INVALID_PARAMETER;
 395         }
 396 }
 397
 398
 399 /**
 400  * Next state function for the GSSAPI GENSEC mechanism
 401  *
 402  * @param gensec_gssapi_state GSSAPI State
 403  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 404  * @param in The request, as a DATA_BLOB
 405  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 406  * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
 407  *                or NT_STATUS_OK if the user is authenticated.
 408  */
 409
 410 static NTSTATUS gensec_gssapi_update(struct gensec_security *gensec_security,
 411                                    TALLOC_CTX *out_mem_ctx,
 412                                    const DATA_BLOB in, DATA_BLOB *out)
 413 {
 414         struct gensec_gssapi_state *gensec_gssapi_state
 415                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 416         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 417         OM_uint32 maj_stat, min_stat;
 418         OM_uint32 min_stat2;
 419         gss_buffer_desc input_token, output_token;
 420         gss_OID gss_oid_p = NULL;
 421         input_token.length = in.length;
 422         input_token.value = in.data;
 423
 424         switch (gensec_gssapi_state->sasl_state) {
 425         case STAGE_GSS_NEG:
 426         {
 427                 switch (gensec_security->gensec_role) {
 428                 case GENSEC_CLIENT:
 429                 {
 430                         struct gsskrb5_send_to_kdc send_to_kdc;
 431                         krb5_error_code ret;
 432                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 433                         send_to_kdc.ptr = gensec_security->event_ctx;
 434
 435                         min_stat = gsskrb5_set_send_to_kdc(&send_to_kdc);
 436                         if (min_stat) {
 437                                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
 438                                 return NT_STATUS_INTERNAL_ERROR;
 439                         }
 440
 441                         maj_stat = gss_init_sec_context(&min_stat,
 442                                                         gensec_gssapi_state->client_cred->creds,
 443                                                         &gensec_gssapi_state->gssapi_context,
 444                                                         gensec_gssapi_state->server_name,
 445                                                         gensec_gssapi_state->gss_oid,
 446                                                         gensec_gssapi_state->want_flags,
 447                                                         0,
 448                                                         gensec_gssapi_state->input_chan_bindings,
 449                                                         &input_token,
 450                                                         &gss_oid_p,
 451                                                         &output_token,
 452                                                         &gensec_gssapi_state->got_flags, /* ret flags */
 453                                                         NULL);
 454                         if (gss_oid_p) {
 455                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 456                         }
 457
 458                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 459                         send_to_kdc.ptr = NULL;
 460
 461                         ret = gsskrb5_set_send_to_kdc(&send_to_kdc);
 462                         if (ret) {
 463                                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
 464                                 return NT_STATUS_INTERNAL_ERROR;
 465                         }
 466
 467                         break;
 468                 }
 469                 case GENSEC_SERVER:
 470                 {
 471                         maj_stat = gss_accept_sec_context(&min_stat,
 472                                                           &gensec_gssapi_state->gssapi_context,
 473                                                           gensec_gssapi_state->server_cred->creds,
 474                                                           &input_token,
 475                                                           gensec_gssapi_state->input_chan_bindings,
 476                                                           &gensec_gssapi_state->client_name,
 477                                                           &gss_oid_p,
 478                                                           &output_token,
 479                                                           &gensec_gssapi_state->got_flags,
 480                                                           NULL,
 481                                                           &gensec_gssapi_state->delegated_cred_handle);
 482                         if (gss_oid_p) {
 483                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 484                         }
 485                         break;
 486                 }
 487                 default:
 488                         return NT_STATUS_INVALID_PARAMETER;
 489
 490                 }
 491
 492                 gensec_gssapi_state->gss_exchange_count++;
 493
 494                 if (maj_stat == GSS_S_COMPLETE) {
 495                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 496                         gss_release_buffer(&min_stat2, &output_token);
 497
 498                         if (gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG) {
 499                                 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
 500                         } else {
 501                                 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
 502                         }
 503
 504                         /* We may have been invoked as SASL, so there
 505                          * is more work to do */
 506                         if (gensec_gssapi_state->sasl) {
 507                                 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
 508                                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 509                         } else {
 510                                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 511
 512                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 513                                         DEBUG(5, ("GSSAPI Connection will be cryptographically sealed\n"));
 514                                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 515                                         DEBUG(5, ("GSSAPI Connection will be cryptographically signed\n"));
 516                                 } else {
 517                                         DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
 518                                 }
 519
 520                                 return NT_STATUS_OK;
 521                         }
 522                 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
 523                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 524                         gss_release_buffer(&min_stat2, &output_token);
 525
 526                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 527                 } else if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
 528                         gss_cred_id_t creds;
 529                         gss_name_t name;
 530                         gss_buffer_desc buffer;
 531                         OM_uint32 lifetime = 0;
 532                         gss_cred_usage_t usage;
 533                         const char *role = NULL;
 534                         DEBUG(0, ("GSS %s Update(krb5)(%d) Update failed, credentials expired during GSSAPI handshake!\n",
 535                                   role,
 536                                   gensec_gssapi_state->gss_exchange_count));
 537
 538
 539                         switch (gensec_security->gensec_role) {
 540                         case GENSEC_CLIENT:
 541                                 creds = gensec_gssapi_state->client_cred->creds;
 542                                 role = "client";
 543                         case GENSEC_SERVER:
 544                                 creds = gensec_gssapi_state->server_cred->creds;
 545                                 role = "server";
 546                         }
 547
 548                         maj_stat = gss_inquire_cred(&min_stat,
 549                                                     creds,
 550                                                     &name, &lifetime, &usage, NULL);
 551
 552                         if (maj_stat == GSS_S_COMPLETE) {
 553                                 const char *usage_string;
 554                                 switch (usage) {
 555                                 case GSS_C_BOTH:
 556                                         usage_string = "GSS_C_BOTH";
 557                                         break;
 558                                 case GSS_C_ACCEPT:
 559                                         usage_string = "GSS_C_ACCEPT";
 560                                         break;
 561                                 case GSS_C_INITIATE:
 562                                         usage_string = "GSS_C_INITIATE";
 563                                         break;
 564                                 }
 565                                 maj_stat = gss_display_name(&min_stat, name, &buffer, NULL);
 566                                 if (maj_stat) {
 567                                         buffer.value = NULL;
 568                                         buffer.length = 0;
 569                                 }
 570                                 if (lifetime > 0) {
 571                                         DEBUG(0, ("GSSAPI gss_inquire_cred indicates expiry of %*.*s in %u sec for %s\n",
 572                                                   (int)buffer.length, (int)buffer.length, (char *)buffer.value,
 573                                                   lifetime, usage_string));
 574                                 } else {
 575                                         DEBUG(0, ("GSSAPI gss_inquire_cred indicates %*.*s has already expired for %s\n",
 576                                                   (int)buffer.length, (int)buffer.length, (char *)buffer.value,
 577                                                   usage_string));
 578                                 }
 579                                 gss_release_buffer(&min_stat, &buffer);
 580                                 gss_release_name(&min_stat, &name);
 581                         } else if (maj_stat != GSS_S_COMPLETE) {
 582                                 DEBUG(0, ("inquiry of credential lifefime via GSSAPI gss_inquire_cred failed: %s\n",
 583                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 584                         }
 585                         return NT_STATUS_INVALID_PARAMETER;
 586                 } else if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
 587                         switch (min_stat) {
 588                         case KRB5KRB_AP_ERR_TKT_NYV:
 589                                 DEBUG(1, ("Error with ticket to contact %s: possible clock skew between us and the KDC or target server: %s\n",
 590                                           gensec_gssapi_state->target_principal,
 591                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 592                                 return NT_STATUS_TIME_DIFFERENCE_AT_DC; /* Make SPNEGO ignore us, we can't go any further here */
 593                         case KRB5KRB_AP_ERR_TKT_EXPIRED:
 594                                 DEBUG(1, ("Error with ticket to contact %s: ticket is expired, possible clock skew between us and the KDC or target server: %s\n",
 595                                           gensec_gssapi_state->target_principal,
 596                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 597                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 598                         case KRB5_KDC_UNREACH:
 599                                 DEBUG(3, ("Cannot reach a KDC we require in order to obtain a ticetk to %s: %s\n",
 600                                           gensec_gssapi_state->target_principal,
 601                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 602                                 return NT_STATUS_NO_LOGON_SERVERS; /* Make SPNEGO ignore us, we can't go any further here */
 603                         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 604                                 DEBUG(3, ("Server %s is not registered with our KDC: %s\n",
 605                                           gensec_gssapi_state->target_principal,
 606                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 607                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 608                         case KRB5KRB_AP_ERR_MSG_TYPE:
 609                                 /* garbage input, possibly from the auto-mech detection */
 610                                 return NT_STATUS_INVALID_PARAMETER;
 611                         default:
 612                                 DEBUG(1, ("GSS %s Update(krb5)(%d) Update failed: %s\n",
 613                                           gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 614                                           gensec_gssapi_state->gss_exchange_count,
 615                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 616                                 return nt_status;
 617                         }
 618                 } else {
 619                         DEBUG(1, ("GSS %s Update(%d) failed: %s\n",
 620                                   gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 621                                   gensec_gssapi_state->gss_exchange_count,
 622                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 623                         return nt_status;
 624                 }
 625                 break;
 626         }
 627
 628         /* These last two stages are only done if we were invoked as SASL */
 629         case STAGE_SASL_SSF_NEG:
 630         {
 631                 switch (gensec_security->gensec_role) {
 632                 case GENSEC_CLIENT:
 633                 {
 634                         uint8_t maxlength_proposed[4];
 635                         uint8_t maxlength_accepted[4];
 636                         uint8_t security_supported;
 637                         int conf_state;
 638                         gss_qop_t qop_state;
 639                         input_token.length = in.length;
 640                         input_token.value = in.data;
 641
 642                         /* As a client, we have just send a
 643                          * zero-length blob to the server (after the
 644                          * normal GSSAPI exchange), and it has replied
 645                          * with it's SASL negotiation */
 646
 647                         maj_stat = gss_unwrap(&min_stat,
 648                                               gensec_gssapi_state->gssapi_context,
 649                                               &input_token,
 650                                               &output_token,
 651                                               &conf_state,
 652                                               &qop_state);
 653                         if (GSS_ERROR(maj_stat)) {
 654                                 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 655                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 656                                 return NT_STATUS_ACCESS_DENIED;
 657                         }
 658
 659                         if (output_token.length < 4) {
 660                                 return NT_STATUS_INVALID_PARAMETER;
 661                         }
 662
 663                         memcpy(maxlength_proposed, output_token.value, 4);
 664                         gss_release_buffer(&min_stat, &output_token);
 665
 666                         /* first byte is the proposed security */
 667                         security_supported = maxlength_proposed[0];
 668                         maxlength_proposed[0] = '\0';
 669
 670                         /* Rest is the proposed max wrap length */
 671                         gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
 672                                                                      gensec_gssapi_state->max_wrap_buf_size);
 673                         gensec_gssapi_state->sasl_protection = 0;
 674                         if (security_supported & NEG_SEAL) {
 675                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 676                                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 677                                 }
 678                         }
 679                         if (security_supported & NEG_SIGN) {
 680                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 681                                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 682                                 }
 683                         }
 684                         if (security_supported & NEG_NONE) {
 685                                 gensec_gssapi_state->sasl_protection |= NEG_NONE;
 686                         }
 687                         if (gensec_gssapi_state->sasl_protection == 0) {
 688                                 DEBUG(1, ("Remote server does not support unprotected connections\n"));
 689                                 return NT_STATUS_ACCESS_DENIED;
 690                         }
 691
 692                         /* Send back the negotiated max length */
 693
 694                         RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
 695
 696                         maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
 697
 698                         input_token.value = maxlength_accepted;
 699                         input_token.length = sizeof(maxlength_accepted);
 700
 701                         maj_stat = gss_wrap(&min_stat,
 702                                             gensec_gssapi_state->gssapi_context,
 703                                             false,
 704                                             GSS_C_QOP_DEFAULT,
 705                                             &input_token,
 706                                             &conf_state,
 707                                             &output_token);
 708                         if (GSS_ERROR(maj_stat)) {
 709                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 710                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 711                                 return NT_STATUS_ACCESS_DENIED;
 712                         }
 713
 714                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 715                         gss_release_buffer(&min_stat, &output_token);
 716
 717                         /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 718                         gensec_gssapi_state->sasl_state = STAGE_DONE;
 719
 720                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 721                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically sealed\n"));
 722                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 723                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically signed\n"));
 724                         } else {
 725                                 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographically protection\n"));
 726                         }
 727
 728                         return NT_STATUS_OK;
 729                 }
 730                 case GENSEC_SERVER:
 731                 {
 732                         uint8_t maxlength_proposed[4];
 733                         uint8_t security_supported = 0x0;
 734                         int conf_state;
 735
 736                         /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
 737                         if (in.length != 0) {
 738                                 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
 739                         }
 740
 741                         /* Give the client some idea what we will support */
 742
 743                         RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
 744                         /* first byte is the proposed security */
 745                         maxlength_proposed[0] = '\0';
 746
 747                         gensec_gssapi_state->sasl_protection = 0;
 748                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 749                                 security_supported |= NEG_SEAL;
 750                         }
 751                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 752                                 security_supported |= NEG_SIGN;
 753                         }
 754                         if (security_supported == 0) {
 755                                 /* If we don't support anything, this must be 0 */
 756                                 RSIVAL(maxlength_proposed, 0, 0x0);
 757                         }
 758
 759                         /* TODO:  We may not wish to support this */
 760                         security_supported |= NEG_NONE;
 761                         maxlength_proposed[0] = security_supported;
 762
 763                         input_token.value = maxlength_proposed;
 764                         input_token.length = sizeof(maxlength_proposed);
 765
 766                         maj_stat = gss_wrap(&min_stat,
 767                                             gensec_gssapi_state->gssapi_context,
 768                                             false,
 769                                             GSS_C_QOP_DEFAULT,
 770                                             &input_token,
 771                                             &conf_state,
 772                                             &output_token);
 773                         if (GSS_ERROR(maj_stat)) {
 774                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 775                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 776                                 return NT_STATUS_ACCESS_DENIED;
 777                         }
 778
 779                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 780                         gss_release_buffer(&min_stat, &output_token);
 781
 782                         gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
 783                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 784                 }
 785                 default:
 786                         return NT_STATUS_INVALID_PARAMETER;
 787
 788                 }
 789         }
 790         /* This is s server-only stage */
 791         case STAGE_SASL_SSF_ACCEPT:
 792         {
 793                 uint8_t maxlength_accepted[4];
 794                 uint8_t security_accepted;
 795                 int conf_state;
 796                 gss_qop_t qop_state;
 797                 input_token.length = in.length;
 798                 input_token.value = in.data;
 799
 800                 maj_stat = gss_unwrap(&min_stat,
 801                                       gensec_gssapi_state->gssapi_context,
 802                                       &input_token,
 803                                       &output_token,
 804                                       &conf_state,
 805                                       &qop_state);
 806                 if (GSS_ERROR(maj_stat)) {
 807                         DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 808                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 809                         return NT_STATUS_ACCESS_DENIED;
 810                 }
 811
 812                 if (output_token.length < 4) {
 813                         return NT_STATUS_INVALID_PARAMETER;
 814                 }
 815
 816                 memcpy(maxlength_accepted, output_token.value, 4);
 817                 gss_release_buffer(&min_stat, &output_token);
 818
 819                 /* first byte is the proposed security */
 820                 security_accepted = maxlength_accepted[0];
 821                 maxlength_accepted[0] = '\0';
 822
 823                 /* Rest is the proposed max wrap length */
 824                 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
 825                                                              gensec_gssapi_state->max_wrap_buf_size);
 826
 827                 gensec_gssapi_state->sasl_protection = 0;
 828                 if (security_accepted & NEG_SEAL) {
 829                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 830                                 DEBUG(1, ("Remote client wanted seal, but gensec refused\n"));
 831                                 return NT_STATUS_ACCESS_DENIED;
 832                         }
 833                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 834                 }
 835                 if (security_accepted & NEG_SIGN) {
 836                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 837                                 DEBUG(1, ("Remote client wanted sign, but gensec refused\n"));
 838                                 return NT_STATUS_ACCESS_DENIED;
 839                         }
 840                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 841                 }
 842                 if (security_accepted & NEG_NONE) {
 843                         gensec_gssapi_state->sasl_protection |= NEG_NONE;
 844                 }
 845
 846                 /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 847                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 848                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 849                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically sealed\n"));
 850                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 851                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically signed\n"));
 852                 } else {
 853                         DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
 854                 }
 855
 856                 *out = data_blob(NULL, 0);
 857                 return NT_STATUS_OK;
 858         }
 859         default:
 860                 return NT_STATUS_INVALID_PARAMETER;
 861         }
 862 }
 863
 864 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
 865                                    TALLOC_CTX *mem_ctx,
 866                                    const DATA_BLOB *in,
 867                                    DATA_BLOB *out)
 868 {
 869         struct gensec_gssapi_state *gensec_gssapi_state
 870                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 871         OM_uint32 maj_stat, min_stat;
 872         gss_buffer_desc input_token, output_token;
 873         int conf_state;
 874         input_token.length = in->length;
 875         input_token.value = in->data;
 876
 877         maj_stat = gss_wrap(&min_stat,
 878                             gensec_gssapi_state->gssapi_context,
 879                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 880                             GSS_C_QOP_DEFAULT,
 881                             &input_token,
 882                             &conf_state,
 883                             &output_token);
 884         if (GSS_ERROR(maj_stat)) {
 885                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 886                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 887                 return NT_STATUS_ACCESS_DENIED;
 888         }
 889
 890         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 891         gss_release_buffer(&min_stat, &output_token);
 892
 893         if (gensec_gssapi_state->sasl) {
 894                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 895                 if (max_wrapped_size < out->length) {
 896                         DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
 897                                   (unsigned)in->length,
 898                                   (unsigned)out->length,
 899                                   (unsigned int)max_wrapped_size));
 900                         return NT_STATUS_INVALID_PARAMETER;
 901                 }
 902         }
 903
 904         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 905             && !conf_state) {
 906                 return NT_STATUS_ACCESS_DENIED;
 907         }
 908         return NT_STATUS_OK;
 909 }
 910
 911 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
 912                                      TALLOC_CTX *mem_ctx,
 913                                      const DATA_BLOB *in,
 914                                      DATA_BLOB *out)
 915 {
 916         struct gensec_gssapi_state *gensec_gssapi_state
 917                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 918         OM_uint32 maj_stat, min_stat;
 919         gss_buffer_desc input_token, output_token;
 920         int conf_state;
 921         gss_qop_t qop_state;
 922         input_token.length = in->length;
 923         input_token.value = in->data;
 924
 925         if (gensec_gssapi_state->sasl) {
 926                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 927                 if (max_wrapped_size < in->length) {
 928                         DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
 929                         return NT_STATUS_INVALID_PARAMETER;
 930                 }
 931         }
 932
 933         maj_stat = gss_unwrap(&min_stat,
 934                               gensec_gssapi_state->gssapi_context,
 935                               &input_token,
 936                               &output_token,
 937                               &conf_state,
 938                               &qop_state);
 939         if (GSS_ERROR(maj_stat)) {
 940                 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
 941                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 942                 return NT_STATUS_ACCESS_DENIED;
 943         }
 944
 945         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 946         gss_release_buffer(&min_stat, &output_token);
 947
 948         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 949             && !conf_state) {
 950                 return NT_STATUS_ACCESS_DENIED;
 951         }
 952         return NT_STATUS_OK;
 953 }
 954
 955 /* Find out the maximum input size negotiated on this connection */
 956
 957 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
 958 {
 959         struct gensec_gssapi_state *gensec_gssapi_state
 960                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 961         OM_uint32 maj_stat, min_stat;
 962         OM_uint32 max_input_size;
 963
 964         maj_stat = gss_wrap_size_limit(&min_stat,
 965                                        gensec_gssapi_state->gssapi_context,
 966                                        gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 967                                        GSS_C_QOP_DEFAULT,
 968                                        gensec_gssapi_state->max_wrap_buf_size,
 969                                        &max_input_size);
 970         if (GSS_ERROR(maj_stat)) {
 971                 TALLOC_CTX *mem_ctx = talloc_new(NULL);
 972                 DEBUG(1, ("gensec_gssapi_max_input_size: determinaing signature size with gss_wrap_size_limit failed: %s\n",
 973                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 974                 talloc_free(mem_ctx);
 975                 return 0;
 976         }
 977
 978         return max_input_size;
 979 }
 980
 981 /* Find out the maximum output size negotiated on this connection */
 982 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
 983 {
 984         struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
 985         return gensec_gssapi_state->max_wrap_buf_size;
 986 }
 987
 988 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
 989                                           TALLOC_CTX *mem_ctx,
 990                                           uint8_t *data, size_t length,
 991                                           const uint8_t *whole_pdu, size_t pdu_length,
 992                                           DATA_BLOB *sig)
 993 {
 994         struct gensec_gssapi_state *gensec_gssapi_state
 995                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 996         OM_uint32 maj_stat, min_stat;
 997         gss_buffer_desc input_token, output_token;
 998         int conf_state;
 999         ssize_t sig_length;
1000
1001         input_token.length = length;
1002         input_token.value = data;
1003
1004         maj_stat = gss_wrap(&min_stat,
1005                             gensec_gssapi_state->gssapi_context,
1006                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
1007                             GSS_C_QOP_DEFAULT,
1008                             &input_token,
1009                             &conf_state,
1010                             &output_token);
1011         if (GSS_ERROR(maj_stat)) {
1012                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
1013                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1014                 return NT_STATUS_ACCESS_DENIED;
1015         }
1016
1017         if (output_token.length < input_token.length) {
1018                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
1019                           (long)output_token.length, (long)length));
1020                 return NT_STATUS_INTERNAL_ERROR;
1021         }
1022         sig_length = output_token.length - input_token.length;
1023
1024         memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
1025         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
1026
1027         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1028         dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
1029         dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
1030
1031         gss_release_buffer(&min_stat, &output_token);
1032
1033         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1034             && !conf_state) {
1035                 return NT_STATUS_ACCESS_DENIED;
1036         }
1037         return NT_STATUS_OK;
1038 }
1039
1040 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
1041                                             uint8_t *data, size_t length,
1042                                             const uint8_t *whole_pdu, size_t pdu_length,
1043                                             const DATA_BLOB *sig)
1044 {
1045         struct gensec_gssapi_state *gensec_gssapi_state
1046                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1047         OM_uint32 maj_stat, min_stat;
1048         gss_buffer_desc input_token, output_token;
1049         int conf_state;
1050         gss_qop_t qop_state;
1051         DATA_BLOB in;
1052
1053         dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
1054
1055         in = data_blob_talloc(gensec_security, NULL, sig->length + length);
1056
1057         memcpy(in.data, sig->data, sig->length);
1058         memcpy(in.data + sig->length, data, length);
1059
1060         input_token.length = in.length;
1061         input_token.value = in.data;
1062
1063         maj_stat = gss_unwrap(&min_stat,
1064                               gensec_gssapi_state->gssapi_context,
1065                               &input_token,
1066                               &output_token,
1067                               &conf_state,
1068                               &qop_state);
1069         talloc_free(in.data);
1070         if (GSS_ERROR(maj_stat)) {
1071                 char *error_string = gssapi_error_string(NULL, maj_stat, min_stat, gensec_gssapi_state->gss_oid);
1072                 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
1073                           error_string));
1074                 talloc_free(error_string);
1075                 return NT_STATUS_ACCESS_DENIED;
1076         }
1077
1078         if (output_token.length != length) {
1079                 return NT_STATUS_INTERNAL_ERROR;
1080         }
1081
1082         memcpy(data, output_token.value, length);
1083
1084         gss_release_buffer(&min_stat, &output_token);
1085
1086         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1087             && !conf_state) {
1088                 return NT_STATUS_ACCESS_DENIED;
1089         }
1090         return NT_STATUS_OK;
1091 }
1092
1093 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1094                                           TALLOC_CTX *mem_ctx,
1095                                           const uint8_t *data, size_t length,
1096                                           const uint8_t *whole_pdu, size_t pdu_length,
1097                                           DATA_BLOB *sig)
1098 {
1099         struct gensec_gssapi_state *gensec_gssapi_state
1100                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1101         OM_uint32 maj_stat, min_stat;
1102         gss_buffer_desc input_token, output_token;
1103
1104         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1105                 input_token.length = pdu_length;
1106                 input_token.value = discard_const_p(uint8_t *, whole_pdu);
1107         } else {
1108                 input_token.length = length;
1109                 input_token.value = discard_const_p(uint8_t *, data);
1110         }
1111
1112         maj_stat = gss_get_mic(&min_stat,
1113                             gensec_gssapi_state->gssapi_context,
1114                             GSS_C_QOP_DEFAULT,
1115                             &input_token,
1116                             &output_token);
1117         if (GSS_ERROR(maj_stat)) {
1118                 DEBUG(1, ("GSS GetMic failed: %s\n",
1119                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1120                 return NT_STATUS_ACCESS_DENIED;
1121         }
1122
1123         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, output_token.length);
1124
1125         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1126
1127         gss_release_buffer(&min_stat, &output_token);
1128
1129         return NT_STATUS_OK;
1130 }
1131
1132 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1133                                            const uint8_t *data, size_t length,
1134                                            const uint8_t *whole_pdu, size_t pdu_length,
1135                                            const DATA_BLOB *sig)
1136 {
1137         struct gensec_gssapi_state *gensec_gssapi_state
1138                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1139         OM_uint32 maj_stat, min_stat;
1140         gss_buffer_desc input_token;
1141         gss_buffer_desc input_message;
1142         gss_qop_t qop_state;
1143
1144         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1145
1146         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1147                 input_message.length = pdu_length;
1148                 input_message.value = discard_const(whole_pdu);
1149         } else {
1150                 input_message.length = length;
1151                 input_message.value = discard_const(data);
1152         }
1153
1154         input_token.length = sig->length;
1155         input_token.value = sig->data;
1156
1157         maj_stat = gss_verify_mic(&min_stat,
1158                               gensec_gssapi_state->gssapi_context,
1159                               &input_message,
1160                               &input_token,
1161                               &qop_state);
1162         if (GSS_ERROR(maj_stat)) {
1163                 char *error_string = gssapi_error_string(NULL, maj_stat, min_stat, gensec_gssapi_state->gss_oid);
1164                 DEBUG(1, ("GSS VerifyMic failed: %s\n", error_string));
1165                 talloc_free(error_string);
1166
1167                 return NT_STATUS_ACCESS_DENIED;
1168         }
1169
1170         return NT_STATUS_OK;
1171 }
1172
1173 /* Try to figure out what features we actually got on the connection */
1174 static bool gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1175                                        uint32_t feature)
1176 {
1177         struct gensec_gssapi_state *gensec_gssapi_state
1178                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1179         if (feature & GENSEC_FEATURE_SIGN) {
1180                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1181                 if (gensec_gssapi_state->sasl
1182                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1183                         return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1184                                 && (gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG));
1185                 }
1186                 return gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG;
1187         }
1188         if (feature & GENSEC_FEATURE_SEAL) {
1189                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1190                 if (gensec_gssapi_state->sasl
1191                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1192                         return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1193                                  && (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG));
1194                 }
1195                 return gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG;
1196         }
1197         if (feature & GENSEC_FEATURE_SESSION_KEY) {
1198                 /* Only for GSSAPI/Krb5 */
1199                 if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
1200                         return true;
1201                 }
1202         }
1203         if (feature & GENSEC_FEATURE_DCE_STYLE) {
1204                 return gensec_gssapi_state->got_flags & GSS_C_DCE_STYLE;
1205         }
1206         if (feature & GENSEC_FEATURE_NEW_SPNEGO) {
1207                 NTSTATUS status;
1208
1209                 if (!(gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG)) {
1210                         return false;
1211                 }
1212
1213                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "force_new_spnego", false)) {
1214                         return true;
1215                 }
1216                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "disable_new_spnego", false)) {
1217                         return false;
1218                 }
1219
1220                 status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1221                 if (!NT_STATUS_IS_OK(status)) {
1222                         return false;
1223                 }
1224
1225                 if (gensec_gssapi_state->lucid->protocol == 1) {
1226                         return true;
1227                 }
1228
1229                 return false;
1230         }
1231         /* We can always do async (rather than strict request/reply) packets.  */
1232         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1233                 return true;
1234         }
1235         return false;
1236 }
1237
1238 /*
1239  * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1240  * (for encrypting some passwords).
1241  *
1242  * This breaks all the abstractions, but what do you expect...
1243  */
1244 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1245                                           DATA_BLOB *session_key)
1246 {
1247         struct gensec_gssapi_state *gensec_gssapi_state
1248                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1249         OM_uint32 maj_stat, min_stat;
1250         krb5_keyblock *subkey;
1251
1252         if (gensec_gssapi_state->sasl_state != STAGE_DONE) {
1253                 return NT_STATUS_NO_USER_SESSION_KEY;
1254         }
1255
1256         if (gensec_gssapi_state->session_key.data) {
1257                 *session_key = gensec_gssapi_state->session_key;
1258                 return NT_STATUS_OK;
1259         }
1260
1261         maj_stat = gsskrb5_get_subkey(&min_stat,
1262                                       gensec_gssapi_state->gssapi_context,
1263                                       &subkey);
1264         if (maj_stat != 0) {
1265                 DEBUG(1, ("NO session key for this mech\n"));
1266                 return NT_STATUS_NO_USER_SESSION_KEY;
1267         }
1268
1269         DEBUG(10, ("Got KRB5 session key of length %d%s\n",
1270                    (int)KRB5_KEY_LENGTH(subkey),
1271                    (gensec_gssapi_state->sasl_state == STAGE_DONE)?" (done)":""));
1272         *session_key = data_blob_talloc(gensec_gssapi_state,
1273                                         KRB5_KEY_DATA(subkey), KRB5_KEY_LENGTH(subkey));
1274         krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context, subkey);
1275         gensec_gssapi_state->session_key = *session_key;
1276         dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
1277
1278         return NT_STATUS_OK;
1279 }
1280
1281 /* Get some basic (and authorization) information about the user on
1282  * this session.  This uses either the PAC (if present) or a local
1283  * database lookup */
1284 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1285                                            struct auth_session_info **_session_info)
1286 {
1287         NTSTATUS nt_status;
1288         TALLOC_CTX *mem_ctx;
1289         struct gensec_gssapi_state *gensec_gssapi_state
1290                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1291         struct auth_user_info_dc *user_info_dc = NULL;
1292         struct auth_session_info *session_info = NULL;
1293         OM_uint32 maj_stat, min_stat;
1294         DATA_BLOB pac_blob;
1295         struct PAC_SIGNATURE_DATA *pac_srv_sig = NULL;
1296         struct PAC_SIGNATURE_DATA *pac_kdc_sig = NULL;
1297
1298         if ((gensec_gssapi_state->gss_oid->length != gss_mech_krb5->length)
1299             || (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
1300                        gensec_gssapi_state->gss_oid->length) != 0)) {
1301                 DEBUG(1, ("NO session info available for this mech\n"));
1302                 return NT_STATUS_INVALID_PARAMETER;
1303         }
1304
1305         mem_ctx = talloc_named(gensec_gssapi_state, 0, "gensec_gssapi_session_info context");
1306         NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
1307
1308         nt_status = gssapi_obtain_pac_blob(mem_ctx,  gensec_gssapi_state->gssapi_context,
1309                                            gensec_gssapi_state->client_name,
1310                                            &pac_blob);
1311
1312         /* IF we have the PAC - otherwise we need to get this
1313          * data from elsewere - local ldb, or (TODO) lookup of some
1314          * kind...
1315          */
1316         if (NT_STATUS_IS_OK(nt_status)) {
1317                 pac_srv_sig = talloc(mem_ctx, struct PAC_SIGNATURE_DATA);
1318                 if (!pac_srv_sig) {
1319                         talloc_free(mem_ctx);
1320                         return NT_STATUS_NO_MEMORY;
1321                 }
1322                 pac_kdc_sig = talloc(mem_ctx, struct PAC_SIGNATURE_DATA);
1323                 if (!pac_kdc_sig) {
1324                         talloc_free(mem_ctx);
1325                         return NT_STATUS_NO_MEMORY;
1326                 }
1327
1328                 nt_status = kerberos_pac_blob_to_user_info_dc(mem_ctx,
1329                                                               pac_blob,
1330                                                               gensec_gssapi_state->smb_krb5_context->krb5_context,
1331                                                               &user_info_dc,
1332                                                               pac_srv_sig,
1333                                                               pac_kdc_sig);
1334                 if (!NT_STATUS_IS_OK(nt_status)) {
1335                         talloc_free(mem_ctx);
1336                         return nt_status;
1337                 }
1338         } else {
1339                 gss_buffer_desc name_token;
1340                 char *principal_string;
1341
1342                 maj_stat = gss_display_name (&min_stat,
1343                                              gensec_gssapi_state->client_name,
1344                                              &name_token,
1345                                              NULL);
1346                 if (GSS_ERROR(maj_stat)) {
1347                         DEBUG(1, ("GSS display_name failed: %s\n",
1348                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1349                         talloc_free(mem_ctx);
1350                         return NT_STATUS_FOOBAR;
1351                 }
1352
1353                 principal_string = talloc_strndup(mem_ctx,
1354                                                   (const char *)name_token.value,
1355                                                   name_token.length);
1356
1357                 gss_release_buffer(&min_stat, &name_token);
1358
1359                 if (!principal_string) {
1360                         talloc_free(mem_ctx);
1361                         return NT_STATUS_NO_MEMORY;
1362                 }
1363
1364                 if (gensec_security->auth_context &&
1365                     !gensec_setting_bool(gensec_security->settings, "gensec", "require_pac", false)) {
1366                         DEBUG(1, ("Unable to find PAC, resorting to local user lookup: %s\n",
1367                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1368                         nt_status = gensec_security->auth_context->get_user_info_dc_principal(mem_ctx,
1369                                                                                              gensec_security->auth_context,
1370                                                                                              principal_string,
1371                                                                                              NULL,
1372                                                                                              &user_info_dc);
1373
1374                         if (!NT_STATUS_IS_OK(nt_status)) {
1375                                 talloc_free(mem_ctx);
1376                                 return nt_status;
1377                         }
1378                 } else {
1379                         DEBUG(1, ("Unable to find PAC in ticket from %s, failing to allow access: %s\n",
1380                                   principal_string,
1381                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1382                         return NT_STATUS_ACCESS_DENIED;
1383                 }
1384         }
1385
1386         /* references the user_info_dc into the session_info */
1387         nt_status = gensec_generate_session_info(mem_ctx, gensec_security,
1388                                                  user_info_dc, &session_info);
1389         if (!NT_STATUS_IS_OK(nt_status)) {
1390                 talloc_free(mem_ctx);
1391                 return nt_status;
1392         }
1393
1394         nt_status = gensec_gssapi_session_key(gensec_security, &session_info->session_key);
1395         if (!NT_STATUS_IS_OK(nt_status)) {
1396                 talloc_free(mem_ctx);
1397                 return nt_status;
1398         }
1399
1400         /* Allow torture tests to check the PAC signatures */
1401         if (session_info->torture) {
1402                 session_info->torture->pac_srv_sig = talloc_steal(session_info->torture, pac_srv_sig);
1403                 session_info->torture->pac_kdc_sig = talloc_steal(session_info->torture, pac_kdc_sig);
1404         }
1405
1406         if (!(gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG)) {
1407                 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1408         } else {
1409                 krb5_error_code ret;
1410                 const char *error_string;
1411
1412                 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1413                 session_info->credentials = cli_credentials_init(session_info);
1414                 if (!session_info->credentials) {
1415                         talloc_free(mem_ctx);
1416                         return NT_STATUS_NO_MEMORY;
1417                 }
1418
1419                 cli_credentials_set_conf(session_info->credentials, gensec_security->settings->lp_ctx);
1420                 /* Just so we don't segfault trying to get at a username */
1421                 cli_credentials_set_anonymous(session_info->credentials);
1422
1423                 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1424                                                            gensec_security->settings->lp_ctx,
1425                                                            gensec_gssapi_state->delegated_cred_handle,
1426                                                            CRED_SPECIFIED, &error_string);
1427                 if (ret) {
1428                         talloc_free(mem_ctx);
1429                         DEBUG(2,("Failed to get gss creds: %s\n", error_string));
1430                         return NT_STATUS_NO_MEMORY;
1431                 }
1432
1433                 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1434                 cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
1435
1436                 /* It has been taken from this place... */
1437                 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1438         }
1439         talloc_steal(gensec_gssapi_state, session_info);
1440         talloc_free(mem_ctx);
1441         *_session_info = session_info;
1442
1443         return NT_STATUS_OK;
1444 }
1445
1446 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
1447 {
1448         struct gensec_gssapi_state *gensec_gssapi_state
1449                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1450         NTSTATUS status;
1451
1452         if (gensec_gssapi_state->sig_size) {
1453                 return gensec_gssapi_state->sig_size;
1454         }
1455
1456         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1457                 gensec_gssapi_state->sig_size = 45;
1458         } else {
1459                 gensec_gssapi_state->sig_size = 37;
1460         }
1461
1462         status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1463         if (!NT_STATUS_IS_OK(status)) {
1464                 return gensec_gssapi_state->sig_size;
1465         }
1466
1467         if (gensec_gssapi_state->lucid->protocol == 1) {
1468                 if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1469                         /*
1470                          * TODO: windows uses 76 here, but we don't know
1471                          *       gss_wrap works with aes keys yet
1472                          */
1473                         gensec_gssapi_state->sig_size = 76;
1474                 } else {
1475                         gensec_gssapi_state->sig_size = 28;
1476                 }
1477         } else if (gensec_gssapi_state->lucid->protocol == 0) {
1478                 switch (gensec_gssapi_state->lucid->rfc1964_kd.ctx_key.type) {
1479                 case KEYTYPE_DES:
1480                 case KEYTYPE_ARCFOUR:
1481                 case KEYTYPE_ARCFOUR_56:
1482                         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1483                                 gensec_gssapi_state->sig_size = 45;
1484                         } else {
1485                                 gensec_gssapi_state->sig_size = 37;
1486                         }
1487                         break;
1488                 case KEYTYPE_DES3:
1489                         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1490                                 gensec_gssapi_state->sig_size = 57;
1491                         } else {
1492                                 gensec_gssapi_state->sig_size = 49;
1493                         }
1494                         break;
1495                 }
1496         }
1497
1498         return gensec_gssapi_state->sig_size;
1499 }
1500
1501 static const char *gensec_gssapi_krb5_oids[] = {
1502         GENSEC_OID_KERBEROS5_OLD,
1503         GENSEC_OID_KERBEROS5,
1504         NULL
1505 };
1506
1507 static const char *gensec_gssapi_spnego_oids[] = {
1508         GENSEC_OID_SPNEGO,
1509         NULL
1510 };
1511
1512 /* As a server, this could in theory accept any GSSAPI mech */
1513 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1514         .name           = "gssapi_spnego",
1515         .sasl_name      = "GSS-SPNEGO",
1516         .auth_type      = DCERPC_AUTH_TYPE_SPNEGO,
1517         .oid            = gensec_gssapi_spnego_oids,
1518         .client_start   = gensec_gssapi_client_start,
1519         .server_start   = gensec_gssapi_server_start,
1520         .magic          = gensec_gssapi_magic,
1521         .update         = gensec_gssapi_update,
1522         .session_key    = gensec_gssapi_session_key,
1523         .session_info   = gensec_gssapi_session_info,
1524         .sign_packet    = gensec_gssapi_sign_packet,
1525         .check_packet   = gensec_gssapi_check_packet,
1526         .seal_packet    = gensec_gssapi_seal_packet,
1527         .unseal_packet  = gensec_gssapi_unseal_packet,
1528         .wrap           = gensec_gssapi_wrap,
1529         .unwrap         = gensec_gssapi_unwrap,
1530         .have_feature   = gensec_gssapi_have_feature,
1531         .enabled        = false,
1532         .kerberos       = true,
1533         .priority       = GENSEC_GSSAPI
1534 };
1535
1536 /* As a server, this could in theory accept any GSSAPI mech */
1537 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1538         .name           = "gssapi_krb5",
1539         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
1540         .oid            = gensec_gssapi_krb5_oids,
1541         .client_start   = gensec_gssapi_client_start,
1542         .server_start   = gensec_gssapi_server_start,
1543         .magic          = gensec_gssapi_magic,
1544         .update         = gensec_gssapi_update,
1545         .session_key    = gensec_gssapi_session_key,
1546         .session_info   = gensec_gssapi_session_info,
1547         .sig_size       = gensec_gssapi_sig_size,
1548         .sign_packet    = gensec_gssapi_sign_packet,
1549         .check_packet   = gensec_gssapi_check_packet,
1550         .seal_packet    = gensec_gssapi_seal_packet,
1551         .unseal_packet  = gensec_gssapi_unseal_packet,
1552         .wrap           = gensec_gssapi_wrap,
1553         .unwrap         = gensec_gssapi_unwrap,
1554         .have_feature   = gensec_gssapi_have_feature,
1555         .enabled        = true,
1556         .kerberos       = true,
1557         .priority       = GENSEC_GSSAPI
1558 };
1559
1560 /* As a server, this could in theory accept any GSSAPI mech */
1561 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1562         .name             = "gssapi_krb5_sasl",
1563         .sasl_name        = "GSSAPI",
1564         .client_start     = gensec_gssapi_sasl_client_start,
1565         .server_start     = gensec_gssapi_sasl_server_start,
1566         .update           = gensec_gssapi_update,
1567         .session_key      = gensec_gssapi_session_key,
1568         .session_info     = gensec_gssapi_session_info,
1569         .max_input_size   = gensec_gssapi_max_input_size,
1570         .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1571         .wrap             = gensec_gssapi_wrap,
1572         .unwrap           = gensec_gssapi_unwrap,
1573         .have_feature     = gensec_gssapi_have_feature,
1574         .enabled          = true,
1575         .kerberos         = true,
1576         .priority         = GENSEC_GSSAPI
1577 };
1578
1579 _PUBLIC_ NTSTATUS gensec_gssapi_init(void)
1580 {
1581         NTSTATUS ret;
1582
1583         ret = gensec_register(&gensec_gssapi_spnego_security_ops);
1584         if (!NT_STATUS_IS_OK(ret)) {
1585                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1586                         gensec_gssapi_spnego_security_ops.name));
1587                 return ret;
1588         }
1589
1590         ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1591         if (!NT_STATUS_IS_OK(ret)) {
1592                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1593                         gensec_gssapi_krb5_security_ops.name));
1594                 return ret;
1595         }
1596
1597         ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1598         if (!NT_STATUS_IS_OK(ret)) {
1599                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1600                         gensec_gssapi_sasl_krb5_security_ops.name));
1601                 return ret;
1602         }
1603
1604         return ret;
1605 }