source4/auth/gensec/gensec_gssapi.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Kerberos backend for GENSEC
   5
   6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
   7    Copyright (C) Stefan Metzmacher <metze@samba.org> 2004-2005
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "lib/events/events.h"
  26 #include "system/kerberos.h"
  27 #include "system/gssapi.h"
  28 #include "auth/kerberos/kerberos.h"
  29 #include "librpc/gen_ndr/krb5pac.h"
  30 #include "auth/auth.h"
  31 #include <ldb.h>
  32 #include "auth/auth_sam.h"
  33 #include "librpc/gen_ndr/dcerpc.h"
  34 #include "auth/credentials/credentials.h"
  35 #include "auth/credentials/credentials_krb5.h"
  36 #include "auth/gensec/gensec.h"
  37 #include "auth/gensec/gensec_internal.h"
  38 #include "auth/gensec/gensec_proto.h"
  39 #include "auth/gensec/gensec_toplevel_proto.h"
  40 #include "param/param.h"
  41 #include "auth/session_proto.h"
  42 #include "gensec_gssapi.h"
  43 #include "lib/util/util_net.h"
  44 #include "auth/kerberos/pac_utils.h"
  45
  46 #ifndef gss_mech_spnego
  47 gss_OID_desc spnego_mech_oid_desc =
  48                 { 6, discard_const_p(void, "\x2b\x06\x01\x05\x05\x02") };
  49 #define gss_mech_spnego (&spnego_mech_oid_desc)
  50 #endif
  51
  52 _PUBLIC_ NTSTATUS gensec_gssapi_init(void);
  53
  54 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security);
  55 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security);
  56
  57 static int gensec_gssapi_destructor(struct gensec_gssapi_state *gensec_gssapi_state)
  58 {
  59         OM_uint32 maj_stat, min_stat;
  60
  61         if (gensec_gssapi_state->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
  62                 maj_stat = gss_release_cred(&min_stat,
  63                                             &gensec_gssapi_state->delegated_cred_handle);
  64         }
  65
  66         if (gensec_gssapi_state->gssapi_context != GSS_C_NO_CONTEXT) {
  67                 maj_stat = gss_delete_sec_context (&min_stat,
  68                                                    &gensec_gssapi_state->gssapi_context,
  69                                                    GSS_C_NO_BUFFER);
  70         }
  71
  72         if (gensec_gssapi_state->server_name != GSS_C_NO_NAME) {
  73                 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->server_name);
  74         }
  75         if (gensec_gssapi_state->client_name != GSS_C_NO_NAME) {
  76                 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->client_name);
  77         }
  78
  79         if (gensec_gssapi_state->lucid) {
  80                 gss_krb5_free_lucid_sec_context(&min_stat, gensec_gssapi_state->lucid);
  81         }
  82
  83         return 0;
  84 }
  85
  86 static NTSTATUS gensec_gssapi_init_lucid(struct gensec_gssapi_state *gensec_gssapi_state)
  87 {
  88         OM_uint32 maj_stat, min_stat;
  89
  90         if (gensec_gssapi_state->lucid) {
  91                 return NT_STATUS_OK;
  92         }
  93
  94         maj_stat = gss_krb5_export_lucid_sec_context(&min_stat,
  95                                                      &gensec_gssapi_state->gssapi_context,
  96                                                      1,
  97                                                      (void **)&gensec_gssapi_state->lucid);
  98         if (maj_stat != GSS_S_COMPLETE) {
  99                 DEBUG(0,("gensec_gssapi_init_lucid: %s\n",
 100                         gssapi_error_string(gensec_gssapi_state,
 101                                             maj_stat, min_stat,
 102                                             gensec_gssapi_state->gss_oid)));
 103                 return NT_STATUS_INTERNAL_ERROR;
 104         }
 105
 106         if (gensec_gssapi_state->lucid->version != 1) {
 107                 DEBUG(0,("gensec_gssapi_init_lucid: lucid version[%d] != 1\n",
 108                         gensec_gssapi_state->lucid->version));
 109                 gss_krb5_free_lucid_sec_context(&min_stat, gensec_gssapi_state->lucid);
 110                 gensec_gssapi_state->lucid = NULL;
 111                 return NT_STATUS_INTERNAL_ERROR;
 112         }
 113
 114         return NT_STATUS_OK;
 115 }
 116
 117 static NTSTATUS gensec_gssapi_start(struct gensec_security *gensec_security)
 118 {
 119         struct gensec_gssapi_state *gensec_gssapi_state;
 120         krb5_error_code ret;
 121         const char *realm;
 122
 123         gensec_gssapi_state = talloc_zero(gensec_security, struct gensec_gssapi_state);
 124         if (!gensec_gssapi_state) {
 125                 return NT_STATUS_NO_MEMORY;
 126         }
 127
 128         gensec_security->private_data = gensec_gssapi_state;
 129
 130         gensec_gssapi_state->gssapi_context = GSS_C_NO_CONTEXT;
 131
 132         /* TODO: Fill in channel bindings */
 133         gensec_gssapi_state->input_chan_bindings = GSS_C_NO_CHANNEL_BINDINGS;
 134
 135         gensec_gssapi_state->server_name = GSS_C_NO_NAME;
 136         gensec_gssapi_state->client_name = GSS_C_NO_NAME;
 137
 138         gensec_gssapi_state->gss_want_flags = 0;
 139         gensec_gssapi_state->expire_time = GENSEC_EXPIRE_TIME_INFINITY;
 140
 141         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation_by_kdc_policy", true)) {
 142                 gensec_gssapi_state->gss_want_flags |= GSS_C_DELEG_POLICY_FLAG;
 143         }
 144         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "mutual", true)) {
 145                 gensec_gssapi_state->gss_want_flags |= GSS_C_MUTUAL_FLAG;
 146         }
 147         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation", true)) {
 148                 gensec_gssapi_state->gss_want_flags |= GSS_C_DELEG_FLAG;
 149         }
 150         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "replay", true)) {
 151                 gensec_gssapi_state->gss_want_flags |= GSS_C_REPLAY_FLAG;
 152         }
 153         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "sequence", true)) {
 154                 gensec_gssapi_state->gss_want_flags |= GSS_C_SEQUENCE_FLAG;
 155         }
 156
 157         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 158                 gensec_gssapi_state->gss_want_flags |= GSS_C_INTEG_FLAG;
 159         }
 160         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 161                 gensec_gssapi_state->gss_want_flags |= GSS_C_INTEG_FLAG;
 162                 gensec_gssapi_state->gss_want_flags |= GSS_C_CONF_FLAG;
 163         }
 164         if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
 165                 gensec_gssapi_state->gss_want_flags |= GSS_C_DCE_STYLE;
 166         }
 167
 168         gensec_gssapi_state->gss_got_flags = 0;
 169
 170         switch (gensec_security->ops->auth_type) {
 171         case DCERPC_AUTH_TYPE_SPNEGO:
 172                 gensec_gssapi_state->gss_oid = gss_mech_spnego;
 173                 break;
 174         case DCERPC_AUTH_TYPE_KRB5:
 175         default:
 176                 gensec_gssapi_state->gss_oid =
 177                         discard_const_p(void, gss_mech_krb5);
 178                 break;
 179         }
 180
 181         ret = smb_krb5_init_context(gensec_gssapi_state,
 182                                     gensec_security->settings->lp_ctx,
 183                                     &gensec_gssapi_state->smb_krb5_context);
 184         if (ret) {
 185                 DEBUG(1,("gensec_gssapi_start: smb_krb5_init_context failed (%s)\n",
 186                          error_message(ret)));
 187                 talloc_free(gensec_gssapi_state);
 188                 return NT_STATUS_INTERNAL_ERROR;
 189         }
 190
 191         gensec_gssapi_state->client_cred = NULL;
 192         gensec_gssapi_state->server_cred = NULL;
 193
 194         gensec_gssapi_state->lucid = NULL;
 195
 196         gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
 197
 198         gensec_gssapi_state->sasl = false;
 199         gensec_gssapi_state->sasl_state = STAGE_GSS_NEG;
 200         gensec_gssapi_state->sasl_protection = 0;
 201
 202         gensec_gssapi_state->max_wrap_buf_size
 203                 = gensec_setting_int(gensec_security->settings, "gensec_gssapi", "max wrap buf size", 65536);
 204         gensec_gssapi_state->gss_exchange_count = 0;
 205         gensec_gssapi_state->sig_size = 0;
 206
 207         talloc_set_destructor(gensec_gssapi_state, gensec_gssapi_destructor);
 208
 209 #ifdef SAMBA4_USES_HEIMDAL
 210         realm = lpcfg_realm(gensec_security->settings->lp_ctx);
 211         if (realm != NULL) {
 212                 ret = gsskrb5_set_default_realm(realm);
 213                 if (ret) {
 214                         DEBUG(1,("gensec_gssapi_start: gsskrb5_set_default_realm failed\n"));
 215                         talloc_free(gensec_gssapi_state);
 216                         return NT_STATUS_INTERNAL_ERROR;
 217                 }
 218         }
 219
 220         /* don't do DNS lookups of any kind, it might/will fail for a netbios name */
 221         ret = gsskrb5_set_dns_canonicalize(gensec_setting_bool(gensec_security->settings, "krb5", "set_dns_canonicalize", false));
 222         if (ret) {
 223                 DEBUG(1,("gensec_gssapi_start: gsskrb5_set_dns_canonicalize failed\n"));
 224                 talloc_free(gensec_gssapi_state);
 225                 return NT_STATUS_INTERNAL_ERROR;
 226         }
 227 #endif
 228         return NT_STATUS_OK;
 229 }
 230
 231 static NTSTATUS gensec_gssapi_server_start(struct gensec_security *gensec_security)
 232 {
 233         NTSTATUS nt_status;
 234         int ret;
 235         struct gensec_gssapi_state *gensec_gssapi_state;
 236         struct cli_credentials *machine_account;
 237         struct gssapi_creds_container *gcc;
 238
 239         nt_status = gensec_gssapi_start(gensec_security);
 240         if (!NT_STATUS_IS_OK(nt_status)) {
 241                 return nt_status;
 242         }
 243
 244         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 245
 246         machine_account = gensec_get_credentials(gensec_security);
 247
 248         if (!machine_account) {
 249                 DEBUG(3, ("No machine account credentials specified\n"));
 250                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 251         } else {
 252                 ret = cli_credentials_get_server_gss_creds(machine_account,
 253                                                            gensec_security->settings->lp_ctx, &gcc);
 254                 if (ret) {
 255                         DEBUG(1, ("Aquiring acceptor credentials failed: %s\n",
 256                                   error_message(ret)));
 257                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 258                 }
 259         }
 260
 261         gensec_gssapi_state->server_cred = gcc;
 262         return NT_STATUS_OK;
 263
 264 }
 265
 266 static NTSTATUS gensec_gssapi_sasl_server_start(struct gensec_security *gensec_security)
 267 {
 268         NTSTATUS nt_status;
 269         struct gensec_gssapi_state *gensec_gssapi_state;
 270         nt_status = gensec_gssapi_server_start(gensec_security);
 271
 272         if (NT_STATUS_IS_OK(nt_status)) {
 273                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 274                 gensec_gssapi_state->sasl = true;
 275         }
 276         return nt_status;
 277 }
 278
 279 static NTSTATUS gensec_gssapi_client_creds(struct gensec_security *gensec_security,
 280                                            struct tevent_context *ev)
 281 {
 282         struct gensec_gssapi_state *gensec_gssapi_state;
 283         struct gssapi_creds_container *gcc;
 284         struct cli_credentials *creds = gensec_get_credentials(gensec_security);
 285         const char *error_string;
 286         int ret;
 287
 288         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 289
 290         /* Only run this the first time the update() call is made */
 291         if (gensec_gssapi_state->client_cred) {
 292                 return NT_STATUS_OK;
 293         }
 294
 295         ret = cli_credentials_get_client_gss_creds(creds,
 296                                                    ev,
 297                                                    gensec_security->settings->lp_ctx, &gcc, &error_string);
 298         switch (ret) {
 299         case 0:
 300                 break;
 301         case EINVAL:
 302                 DEBUG(3, ("Cannot obtain client GSS credentials we need to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
 303                 return NT_STATUS_INVALID_PARAMETER;
 304         case KRB5KDC_ERR_PREAUTH_FAILED:
 305         case KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN:
 306                 DEBUG(1, ("Wrong username or password: %s\n", error_string));
 307                 return NT_STATUS_LOGON_FAILURE;
 308         case KRB5KDC_ERR_CLIENT_REVOKED:
 309                 DEBUG(1, ("Account locked out: %s\n", error_string));
 310                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 311         case KRB5_KDC_UNREACH:
 312                 DEBUG(3, ("Cannot reach a KDC we require to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
 313                 return NT_STATUS_NO_LOGON_SERVERS;
 314         case KRB5_CC_NOTFOUND:
 315         case KRB5_CC_END:
 316                 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));
 317                 return NT_STATUS_TIME_DIFFERENCE_AT_DC;
 318         default:
 319                 DEBUG(1, ("Aquiring initiator credentials failed: %s\n", error_string));
 320                 return NT_STATUS_UNSUCCESSFUL;
 321         }
 322
 323         gensec_gssapi_state->client_cred = gcc;
 324         if (!talloc_reference(gensec_gssapi_state, gcc)) {
 325                 return NT_STATUS_NO_MEMORY;
 326         }
 327
 328         return NT_STATUS_OK;
 329 }
 330
 331 static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_security)
 332 {
 333         struct gensec_gssapi_state *gensec_gssapi_state;
 334         struct cli_credentials *creds = gensec_get_credentials(gensec_security);
 335         NTSTATUS nt_status;
 336         gss_buffer_desc name_token;
 337         gss_OID name_type;
 338         OM_uint32 maj_stat, min_stat;
 339         const char *hostname = gensec_get_target_hostname(gensec_security);
 340
 341         if (!hostname) {
 342                 DEBUG(3, ("No hostname for target computer passed in, cannot use kerberos for this connection\n"));
 343                 return NT_STATUS_INVALID_PARAMETER;
 344         }
 345         if (is_ipaddress(hostname)) {
 346                 DEBUG(2, ("Cannot do GSSAPI to an IP address\n"));
 347                 return NT_STATUS_INVALID_PARAMETER;
 348         }
 349         if (strcmp(hostname, "localhost") == 0) {
 350                 DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
 351                 return NT_STATUS_INVALID_PARAMETER;
 352         }
 353
 354         nt_status = gensec_gssapi_start(gensec_security);
 355         if (!NT_STATUS_IS_OK(nt_status)) {
 356                 return nt_status;
 357         }
 358
 359         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 360
 361         if (cli_credentials_get_impersonate_principal(creds)) {
 362                 gensec_gssapi_state->gss_want_flags &= ~(GSS_C_DELEG_FLAG|GSS_C_DELEG_POLICY_FLAG);
 363         }
 364
 365         gensec_gssapi_state->target_principal = gensec_get_target_principal(gensec_security);
 366         if (gensec_gssapi_state->target_principal) {
 367                 name_type = GSS_C_NULL_OID;
 368         } else {
 369                 gensec_gssapi_state->target_principal = talloc_asprintf(gensec_gssapi_state, "%s/%s@%s",
 370                                             gensec_get_target_service(gensec_security),
 371                                             hostname, lpcfg_realm(gensec_security->settings->lp_ctx));
 372
 373                 name_type = GSS_C_NT_USER_NAME;
 374         }
 375         name_token.value  = discard_const_p(uint8_t, gensec_gssapi_state->target_principal);
 376         name_token.length = strlen(gensec_gssapi_state->target_principal);
 377
 378
 379         maj_stat = gss_import_name (&min_stat,
 380                                     &name_token,
 381                                     name_type,
 382                                     &gensec_gssapi_state->server_name);
 383         if (maj_stat) {
 384                 DEBUG(2, ("GSS Import name of %s failed: %s\n",
 385                           (char *)name_token.value,
 386                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 387                 return NT_STATUS_INVALID_PARAMETER;
 388         }
 389
 390         return NT_STATUS_OK;
 391 }
 392
 393 static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
 394 {
 395         NTSTATUS nt_status;
 396         struct gensec_gssapi_state *gensec_gssapi_state;
 397         nt_status = gensec_gssapi_client_start(gensec_security);
 398
 399         if (NT_STATUS_IS_OK(nt_status)) {
 400                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 401                 gensec_gssapi_state->sasl = true;
 402         }
 403         return nt_status;
 404 }
 405
 406
 407 /**
 408  * Next state function for the GSSAPI GENSEC mechanism
 409  *
 410  * @param gensec_gssapi_state GSSAPI State
 411  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 412  * @param in The request, as a DATA_BLOB
 413  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 414  * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
 415  *                or NT_STATUS_OK if the user is authenticated.
 416  */
 417
 418 static NTSTATUS gensec_gssapi_update(struct gensec_security *gensec_security,
 419                                      TALLOC_CTX *out_mem_ctx,
 420                                      struct tevent_context *ev,
 421                                      const DATA_BLOB in, DATA_BLOB *out)
 422 {
 423         struct gensec_gssapi_state *gensec_gssapi_state
 424                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 425         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 426         OM_uint32 maj_stat, min_stat;
 427         OM_uint32 min_stat2;
 428         gss_buffer_desc input_token, output_token;
 429         gss_OID gss_oid_p = NULL;
 430         OM_uint32 time_req = 0;
 431         OM_uint32 time_rec = 0;
 432         struct timeval tv;
 433
 434         time_req = gensec_setting_int(gensec_security->settings,
 435                                       "gensec_gssapi", "requested_life_time",
 436                                       time_req);
 437
 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 #ifdef SAMBA4_USES_HEIMDAL
 448                         struct gsskrb5_send_to_kdc send_to_kdc;
 449 #endif
 450                         krb5_error_code ret;
 451
 452                         nt_status = gensec_gssapi_client_creds(gensec_security, ev);
 453                         if (!NT_STATUS_IS_OK(nt_status)) {
 454                                 return nt_status;
 455                         }
 456
 457 #ifdef SAMBA4_USES_HEIMDAL
 458                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 459                         send_to_kdc.ptr = ev;
 460
 461                         min_stat = gsskrb5_set_send_to_kdc(&send_to_kdc);
 462                         if (min_stat) {
 463                                 DEBUG(1,("gensec_gssapi_update: gsskrb5_set_send_to_kdc failed\n"));
 464                                 return NT_STATUS_INTERNAL_ERROR;
 465                         }
 466 #endif
 467                         maj_stat = gss_init_sec_context(&min_stat,
 468                                                         gensec_gssapi_state->client_cred->creds,
 469                                                         &gensec_gssapi_state->gssapi_context,
 470                                                         gensec_gssapi_state->server_name,
 471                                                         gensec_gssapi_state->gss_oid,
 472                                                         gensec_gssapi_state->gss_want_flags,
 473                                                         time_req,
 474                                                         gensec_gssapi_state->input_chan_bindings,
 475                                                         &input_token,
 476                                                         &gss_oid_p,
 477                                                         &output_token,
 478                                                         &gensec_gssapi_state->gss_got_flags, /* ret flags */
 479                                                         &time_rec);
 480                         if (gss_oid_p) {
 481                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 482                         }
 483
 484 #ifdef SAMBA4_USES_HEIMDAL
 485                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 486                         send_to_kdc.ptr = NULL;
 487
 488                         ret = gsskrb5_set_send_to_kdc(&send_to_kdc);
 489                         if (ret) {
 490                                 DEBUG(1,("gensec_gssapi_update: gsskrb5_set_send_to_kdc failed\n"));
 491                                 return NT_STATUS_INTERNAL_ERROR;
 492                         }
 493 #endif
 494                         break;
 495                 }
 496                 case GENSEC_SERVER:
 497                 {
 498                         maj_stat = gss_accept_sec_context(&min_stat,
 499                                                           &gensec_gssapi_state->gssapi_context,
 500                                                           gensec_gssapi_state->server_cred->creds,
 501                                                           &input_token,
 502                                                           gensec_gssapi_state->input_chan_bindings,
 503                                                           &gensec_gssapi_state->client_name,
 504                                                           &gss_oid_p,
 505                                                           &output_token,
 506                                                           &gensec_gssapi_state->gss_got_flags,
 507                                                           &time_rec,
 508                                                           &gensec_gssapi_state->delegated_cred_handle);
 509                         if (gss_oid_p) {
 510                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 511                         }
 512                         break;
 513                 }
 514                 default:
 515                         return NT_STATUS_INVALID_PARAMETER;
 516
 517                 }
 518
 519                 gensec_gssapi_state->gss_exchange_count++;
 520
 521                 if (maj_stat == GSS_S_COMPLETE) {
 522                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 523                         gss_release_buffer(&min_stat2, &output_token);
 524
 525                         if (gensec_gssapi_state->gss_got_flags & GSS_C_DELEG_FLAG) {
 526                                 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
 527                         } else {
 528                                 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
 529                         }
 530
 531                         tv = timeval_current_ofs(time_rec, 0);
 532                         gensec_gssapi_state->expire_time = timeval_to_nttime(&tv);
 533
 534                         /* We may have been invoked as SASL, so there
 535                          * is more work to do */
 536                         if (gensec_gssapi_state->sasl) {
 537                                 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
 538                                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 539                         } else {
 540                                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 541
 542                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 543                                         DEBUG(5, ("GSSAPI Connection will be cryptographically sealed\n"));
 544                                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 545                                         DEBUG(5, ("GSSAPI Connection will be cryptographically signed\n"));
 546                                 } else {
 547                                         DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
 548                                 }
 549
 550                                 return NT_STATUS_OK;
 551                         }
 552                 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
 553                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 554                         gss_release_buffer(&min_stat2, &output_token);
 555
 556                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 557                 } else if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
 558                         gss_cred_id_t creds;
 559                         gss_name_t name;
 560                         gss_buffer_desc buffer;
 561                         OM_uint32 lifetime = 0;
 562                         gss_cred_usage_t usage;
 563                         const char *role = NULL;
 564                         DEBUG(0, ("GSS %s Update(krb5)(%d) Update failed, credentials expired during GSSAPI handshake!\n",
 565                                   role,
 566                                   gensec_gssapi_state->gss_exchange_count));
 567
 568
 569                         switch (gensec_security->gensec_role) {
 570                         case GENSEC_CLIENT:
 571                                 creds = gensec_gssapi_state->client_cred->creds;
 572                                 role = "client";
 573                                 break;
 574                         case GENSEC_SERVER:
 575                                 creds = gensec_gssapi_state->server_cred->creds;
 576                                 role = "server";
 577                                 break;
 578                         }
 579
 580                         maj_stat = gss_inquire_cred(&min_stat,
 581                                                     creds,
 582                                                     &name, &lifetime, &usage, NULL);
 583
 584                         if (maj_stat == GSS_S_COMPLETE) {
 585                                 const char *usage_string;
 586                                 switch (usage) {
 587                                 case GSS_C_BOTH:
 588                                         usage_string = "GSS_C_BOTH";
 589                                         break;
 590                                 case GSS_C_ACCEPT:
 591                                         usage_string = "GSS_C_ACCEPT";
 592                                         break;
 593                                 case GSS_C_INITIATE:
 594                                         usage_string = "GSS_C_INITIATE";
 595                                         break;
 596                                 }
 597                                 maj_stat = gss_display_name(&min_stat, name, &buffer, NULL);
 598                                 if (maj_stat) {
 599                                         buffer.value = NULL;
 600                                         buffer.length = 0;
 601                                 }
 602                                 if (lifetime > 0) {
 603                                         DEBUG(0, ("GSSAPI gss_inquire_cred indicates expiry of %*.*s in %u sec for %s\n",
 604                                                   (int)buffer.length, (int)buffer.length, (char *)buffer.value,
 605                                                   lifetime, usage_string));
 606                                 } else {
 607                                         DEBUG(0, ("GSSAPI gss_inquire_cred indicates %*.*s has already expired for %s\n",
 608                                                   (int)buffer.length, (int)buffer.length, (char *)buffer.value,
 609                                                   usage_string));
 610                                 }
 611                                 gss_release_buffer(&min_stat, &buffer);
 612                                 gss_release_name(&min_stat, &name);
 613                         } else if (maj_stat != GSS_S_COMPLETE) {
 614                                 DEBUG(0, ("inquiry of credential lifefime via GSSAPI gss_inquire_cred failed: %s\n",
 615                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 616                         }
 617                         return NT_STATUS_INVALID_PARAMETER;
 618                 } else if (smb_gss_oid_equal(gensec_gssapi_state->gss_oid,
 619                                              gss_mech_krb5)) {
 620                         switch (min_stat) {
 621                         case KRB5KRB_AP_ERR_TKT_NYV:
 622                                 DEBUG(1, ("Error with ticket to contact %s: possible clock skew between us and the KDC or target server: %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_TIME_DIFFERENCE_AT_DC; /* Make SPNEGO ignore us, we can't go any further here */
 626                         case KRB5KRB_AP_ERR_TKT_EXPIRED:
 627                                 DEBUG(1, ("Error with ticket to contact %s: ticket is expired, possible clock skew between us and the KDC or target server: %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 KRB5_KDC_UNREACH:
 632                                 DEBUG(3, ("Cannot reach a KDC we require in order to obtain a ticetk to %s: %s\n",
 633                                           gensec_gssapi_state->target_principal,
 634                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 635                                 return NT_STATUS_NO_LOGON_SERVERS; /* Make SPNEGO ignore us, we can't go any further here */
 636                         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 637                                 DEBUG(3, ("Server %s is not registered with our KDC: %s\n",
 638                                           gensec_gssapi_state->target_principal,
 639                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 640                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 641                         case KRB5KRB_AP_ERR_MSG_TYPE:
 642                                 /* garbage input, possibly from the auto-mech detection */
 643                                 return NT_STATUS_INVALID_PARAMETER;
 644                         default:
 645                                 DEBUG(1, ("GSS %s Update(krb5)(%d) Update failed: %s\n",
 646                                           gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 647                                           gensec_gssapi_state->gss_exchange_count,
 648                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 649                                 return nt_status;
 650                         }
 651                 } else {
 652                         DEBUG(1, ("GSS %s Update(%d) failed: %s\n",
 653                                   gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 654                                   gensec_gssapi_state->gss_exchange_count,
 655                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 656                         return nt_status;
 657                 }
 658                 break;
 659         }
 660
 661         /* These last two stages are only done if we were invoked as SASL */
 662         case STAGE_SASL_SSF_NEG:
 663         {
 664                 switch (gensec_security->gensec_role) {
 665                 case GENSEC_CLIENT:
 666                 {
 667                         uint8_t maxlength_proposed[4];
 668                         uint8_t maxlength_accepted[4];
 669                         uint8_t security_supported;
 670                         int conf_state;
 671                         gss_qop_t qop_state;
 672                         input_token.length = in.length;
 673                         input_token.value = in.data;
 674
 675                         /* As a client, we have just send a
 676                          * zero-length blob to the server (after the
 677                          * normal GSSAPI exchange), and it has replied
 678                          * with it's SASL negotiation */
 679
 680                         maj_stat = gss_unwrap(&min_stat,
 681                                               gensec_gssapi_state->gssapi_context,
 682                                               &input_token,
 683                                               &output_token,
 684                                               &conf_state,
 685                                               &qop_state);
 686                         if (GSS_ERROR(maj_stat)) {
 687                                 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 688                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 689                                 return NT_STATUS_ACCESS_DENIED;
 690                         }
 691
 692                         if (output_token.length < 4) {
 693                                 return NT_STATUS_INVALID_PARAMETER;
 694                         }
 695
 696                         memcpy(maxlength_proposed, output_token.value, 4);
 697                         gss_release_buffer(&min_stat, &output_token);
 698
 699                         /* first byte is the proposed security */
 700                         security_supported = maxlength_proposed[0];
 701                         maxlength_proposed[0] = '\0';
 702
 703                         /* Rest is the proposed max wrap length */
 704                         gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
 705                                                                      gensec_gssapi_state->max_wrap_buf_size);
 706                         gensec_gssapi_state->sasl_protection = 0;
 707                         if (security_supported & NEG_SEAL) {
 708                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 709                                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 710                                 }
 711                         }
 712                         if (security_supported & NEG_SIGN) {
 713                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 714                                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 715                                 }
 716                         }
 717                         if (security_supported & NEG_NONE) {
 718                                 gensec_gssapi_state->sasl_protection |= NEG_NONE;
 719                         }
 720                         if (gensec_gssapi_state->sasl_protection == 0) {
 721                                 DEBUG(1, ("Remote server does not support unprotected connections\n"));
 722                                 return NT_STATUS_ACCESS_DENIED;
 723                         }
 724
 725                         /* Send back the negotiated max length */
 726
 727                         RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
 728
 729                         maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
 730
 731                         input_token.value = maxlength_accepted;
 732                         input_token.length = sizeof(maxlength_accepted);
 733
 734                         maj_stat = gss_wrap(&min_stat,
 735                                             gensec_gssapi_state->gssapi_context,
 736                                             false,
 737                                             GSS_C_QOP_DEFAULT,
 738                                             &input_token,
 739                                             &conf_state,
 740                                             &output_token);
 741                         if (GSS_ERROR(maj_stat)) {
 742                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 743                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 744                                 return NT_STATUS_ACCESS_DENIED;
 745                         }
 746
 747                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 748                         gss_release_buffer(&min_stat, &output_token);
 749
 750                         /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 751                         gensec_gssapi_state->sasl_state = STAGE_DONE;
 752
 753                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 754                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically sealed\n"));
 755                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 756                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically signed\n"));
 757                         } else {
 758                                 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographically protection\n"));
 759                         }
 760
 761                         return NT_STATUS_OK;
 762                 }
 763                 case GENSEC_SERVER:
 764                 {
 765                         uint8_t maxlength_proposed[4];
 766                         uint8_t security_supported = 0x0;
 767                         int conf_state;
 768
 769                         /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
 770                         if (in.length != 0) {
 771                                 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
 772                         }
 773
 774                         /* Give the client some idea what we will support */
 775
 776                         RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
 777                         /* first byte is the proposed security */
 778                         maxlength_proposed[0] = '\0';
 779
 780                         gensec_gssapi_state->sasl_protection = 0;
 781                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 782                                 security_supported |= NEG_SEAL;
 783                         }
 784                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 785                                 security_supported |= NEG_SIGN;
 786                         }
 787                         if (security_supported == 0) {
 788                                 /* If we don't support anything, this must be 0 */
 789                                 RSIVAL(maxlength_proposed, 0, 0x0);
 790                         }
 791
 792                         /* TODO:  We may not wish to support this */
 793                         security_supported |= NEG_NONE;
 794                         maxlength_proposed[0] = security_supported;
 795
 796                         input_token.value = maxlength_proposed;
 797                         input_token.length = sizeof(maxlength_proposed);
 798
 799                         maj_stat = gss_wrap(&min_stat,
 800                                             gensec_gssapi_state->gssapi_context,
 801                                             false,
 802                                             GSS_C_QOP_DEFAULT,
 803                                             &input_token,
 804                                             &conf_state,
 805                                             &output_token);
 806                         if (GSS_ERROR(maj_stat)) {
 807                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap 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                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 813                         gss_release_buffer(&min_stat, &output_token);
 814
 815                         gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
 816                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 817                 }
 818                 default:
 819                         return NT_STATUS_INVALID_PARAMETER;
 820
 821                 }
 822         }
 823         /* This is s server-only stage */
 824         case STAGE_SASL_SSF_ACCEPT:
 825         {
 826                 uint8_t maxlength_accepted[4];
 827                 uint8_t security_accepted;
 828                 int conf_state;
 829                 gss_qop_t qop_state;
 830                 input_token.length = in.length;
 831                 input_token.value = in.data;
 832
 833                 maj_stat = gss_unwrap(&min_stat,
 834                                       gensec_gssapi_state->gssapi_context,
 835                                       &input_token,
 836                                       &output_token,
 837                                       &conf_state,
 838                                       &qop_state);
 839                 if (GSS_ERROR(maj_stat)) {
 840                         DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 841                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 842                         return NT_STATUS_ACCESS_DENIED;
 843                 }
 844
 845                 if (output_token.length < 4) {
 846                         return NT_STATUS_INVALID_PARAMETER;
 847                 }
 848
 849                 memcpy(maxlength_accepted, output_token.value, 4);
 850                 gss_release_buffer(&min_stat, &output_token);
 851
 852                 /* first byte is the proposed security */
 853                 security_accepted = maxlength_accepted[0];
 854                 maxlength_accepted[0] = '\0';
 855
 856                 /* Rest is the proposed max wrap length */
 857                 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
 858                                                              gensec_gssapi_state->max_wrap_buf_size);
 859
 860                 gensec_gssapi_state->sasl_protection = 0;
 861                 if (security_accepted & NEG_SEAL) {
 862                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 863                                 DEBUG(1, ("Remote client wanted seal, but gensec refused\n"));
 864                                 return NT_STATUS_ACCESS_DENIED;
 865                         }
 866                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 867                 }
 868                 if (security_accepted & NEG_SIGN) {
 869                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 870                                 DEBUG(1, ("Remote client wanted sign, but gensec refused\n"));
 871                                 return NT_STATUS_ACCESS_DENIED;
 872                         }
 873                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 874                 }
 875                 if (security_accepted & NEG_NONE) {
 876                         gensec_gssapi_state->sasl_protection |= NEG_NONE;
 877                 }
 878
 879                 /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 880                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 881                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 882                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically sealed\n"));
 883                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 884                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically signed\n"));
 885                 } else {
 886                         DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
 887                 }
 888
 889                 *out = data_blob(NULL, 0);
 890                 return NT_STATUS_OK;
 891         }
 892         default:
 893                 return NT_STATUS_INVALID_PARAMETER;
 894         }
 895 }
 896
 897 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
 898                                    TALLOC_CTX *mem_ctx,
 899                                    const DATA_BLOB *in,
 900                                    DATA_BLOB *out)
 901 {
 902         struct gensec_gssapi_state *gensec_gssapi_state
 903                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 904         OM_uint32 maj_stat, min_stat;
 905         gss_buffer_desc input_token, output_token;
 906         int conf_state;
 907         input_token.length = in->length;
 908         input_token.value = in->data;
 909
 910         maj_stat = gss_wrap(&min_stat,
 911                             gensec_gssapi_state->gssapi_context,
 912                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 913                             GSS_C_QOP_DEFAULT,
 914                             &input_token,
 915                             &conf_state,
 916                             &output_token);
 917         if (GSS_ERROR(maj_stat)) {
 918                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 919                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 920                 return NT_STATUS_ACCESS_DENIED;
 921         }
 922
 923         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 924         gss_release_buffer(&min_stat, &output_token);
 925
 926         if (gensec_gssapi_state->sasl) {
 927                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 928                 if (max_wrapped_size < out->length) {
 929                         DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
 930                                   (unsigned)in->length,
 931                                   (unsigned)out->length,
 932                                   (unsigned int)max_wrapped_size));
 933                         return NT_STATUS_INVALID_PARAMETER;
 934                 }
 935         }
 936
 937         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 938             && !conf_state) {
 939                 return NT_STATUS_ACCESS_DENIED;
 940         }
 941         return NT_STATUS_OK;
 942 }
 943
 944 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
 945                                      TALLOC_CTX *mem_ctx,
 946                                      const DATA_BLOB *in,
 947                                      DATA_BLOB *out)
 948 {
 949         struct gensec_gssapi_state *gensec_gssapi_state
 950                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 951         OM_uint32 maj_stat, min_stat;
 952         gss_buffer_desc input_token, output_token;
 953         int conf_state;
 954         gss_qop_t qop_state;
 955         input_token.length = in->length;
 956         input_token.value = in->data;
 957
 958         if (gensec_gssapi_state->sasl) {
 959                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 960                 if (max_wrapped_size < in->length) {
 961                         DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
 962                         return NT_STATUS_INVALID_PARAMETER;
 963                 }
 964         }
 965
 966         maj_stat = gss_unwrap(&min_stat,
 967                               gensec_gssapi_state->gssapi_context,
 968                               &input_token,
 969                               &output_token,
 970                               &conf_state,
 971                               &qop_state);
 972         if (GSS_ERROR(maj_stat)) {
 973                 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
 974                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 975                 return NT_STATUS_ACCESS_DENIED;
 976         }
 977
 978         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 979         gss_release_buffer(&min_stat, &output_token);
 980
 981         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 982             && !conf_state) {
 983                 return NT_STATUS_ACCESS_DENIED;
 984         }
 985         return NT_STATUS_OK;
 986 }
 987
 988 /* Find out the maximum input size negotiated on this connection */
 989
 990 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
 991 {
 992         struct gensec_gssapi_state *gensec_gssapi_state
 993                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 994         OM_uint32 maj_stat, min_stat;
 995         OM_uint32 max_input_size;
 996
 997         maj_stat = gss_wrap_size_limit(&min_stat,
 998                                        gensec_gssapi_state->gssapi_context,
 999                                        gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
1000                                        GSS_C_QOP_DEFAULT,
1001                                        gensec_gssapi_state->max_wrap_buf_size,
1002                                        &max_input_size);
1003         if (GSS_ERROR(maj_stat)) {
1004                 TALLOC_CTX *mem_ctx = talloc_new(NULL);
1005                 DEBUG(1, ("gensec_gssapi_max_input_size: determining signature size with gss_wrap_size_limit failed: %s\n",
1006                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1007                 talloc_free(mem_ctx);
1008                 return 0;
1009         }
1010
1011         return max_input_size;
1012 }
1013
1014 /* Find out the maximum output size negotiated on this connection */
1015 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
1016 {
1017         struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
1018         return gensec_gssapi_state->max_wrap_buf_size;
1019 }
1020
1021 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
1022                                           TALLOC_CTX *mem_ctx,
1023                                           uint8_t *data, size_t length,
1024                                           const uint8_t *whole_pdu, size_t pdu_length,
1025                                           DATA_BLOB *sig)
1026 {
1027         struct gensec_gssapi_state *gensec_gssapi_state
1028                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1029         OM_uint32 maj_stat, min_stat;
1030         gss_buffer_desc input_token, output_token;
1031         int conf_state;
1032         ssize_t sig_length;
1033
1034         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1035                 DEBUG(1, ("gensec_gssapi_seal_packet: "
1036                           "GENSEC_FEATURE_SIGN_PKT_HEADER not supported\n"));
1037                 return NT_STATUS_ACCESS_DENIED;
1038         }
1039
1040         input_token.length = length;
1041         input_token.value = data;
1042
1043         maj_stat = gss_wrap(&min_stat,
1044                             gensec_gssapi_state->gssapi_context,
1045                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
1046                             GSS_C_QOP_DEFAULT,
1047                             &input_token,
1048                             &conf_state,
1049                             &output_token);
1050         if (GSS_ERROR(maj_stat)) {
1051                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
1052                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1053                 return NT_STATUS_ACCESS_DENIED;
1054         }
1055
1056         if (output_token.length < input_token.length) {
1057                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
1058                           (long)output_token.length, (long)length));
1059                 return NT_STATUS_INTERNAL_ERROR;
1060         }
1061         sig_length = output_token.length - input_token.length;
1062
1063         memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
1064         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
1065
1066         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1067         dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
1068         dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
1069
1070         gss_release_buffer(&min_stat, &output_token);
1071
1072         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1073             && !conf_state) {
1074                 return NT_STATUS_ACCESS_DENIED;
1075         }
1076         return NT_STATUS_OK;
1077 }
1078
1079 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
1080                                             uint8_t *data, size_t length,
1081                                             const uint8_t *whole_pdu, size_t pdu_length,
1082                                             const DATA_BLOB *sig)
1083 {
1084         struct gensec_gssapi_state *gensec_gssapi_state
1085                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1086         OM_uint32 maj_stat, min_stat;
1087         gss_buffer_desc input_token, output_token;
1088         int conf_state;
1089         gss_qop_t qop_state;
1090         DATA_BLOB in;
1091
1092         dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
1093
1094         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1095                 DEBUG(1, ("gensec_gssapi_unseal_packet: "
1096                           "GENSEC_FEATURE_SIGN_PKT_HEADER not supported\n"));
1097                 return NT_STATUS_ACCESS_DENIED;
1098         }
1099
1100         in = data_blob_talloc(gensec_security, NULL, sig->length + length);
1101
1102         memcpy(in.data, sig->data, sig->length);
1103         memcpy(in.data + sig->length, data, length);
1104
1105         input_token.length = in.length;
1106         input_token.value = in.data;
1107
1108         maj_stat = gss_unwrap(&min_stat,
1109                               gensec_gssapi_state->gssapi_context,
1110                               &input_token,
1111                               &output_token,
1112                               &conf_state,
1113                               &qop_state);
1114         talloc_free(in.data);
1115         if (GSS_ERROR(maj_stat)) {
1116                 char *error_string = gssapi_error_string(NULL, maj_stat, min_stat, gensec_gssapi_state->gss_oid);
1117                 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
1118                           error_string));
1119                 talloc_free(error_string);
1120                 return NT_STATUS_ACCESS_DENIED;
1121         }
1122
1123         if (output_token.length != length) {
1124                 return NT_STATUS_INTERNAL_ERROR;
1125         }
1126
1127         memcpy(data, output_token.value, length);
1128
1129         gss_release_buffer(&min_stat, &output_token);
1130
1131         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1132             && !conf_state) {
1133                 return NT_STATUS_ACCESS_DENIED;
1134         }
1135         return NT_STATUS_OK;
1136 }
1137
1138 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1139                                           TALLOC_CTX *mem_ctx,
1140                                           const uint8_t *data, size_t length,
1141                                           const uint8_t *whole_pdu, size_t pdu_length,
1142                                           DATA_BLOB *sig)
1143 {
1144         struct gensec_gssapi_state *gensec_gssapi_state
1145                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1146         OM_uint32 maj_stat, min_stat;
1147         gss_buffer_desc input_token, output_token;
1148
1149         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1150                 input_token.length = pdu_length;
1151                 input_token.value = discard_const_p(uint8_t *, whole_pdu);
1152         } else {
1153                 input_token.length = length;
1154                 input_token.value = discard_const_p(uint8_t *, data);
1155         }
1156
1157         maj_stat = gss_get_mic(&min_stat,
1158                             gensec_gssapi_state->gssapi_context,
1159                             GSS_C_QOP_DEFAULT,
1160                             &input_token,
1161                             &output_token);
1162         if (GSS_ERROR(maj_stat)) {
1163                 DEBUG(1, ("GSS GetMic failed: %s\n",
1164                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1165                 return NT_STATUS_ACCESS_DENIED;
1166         }
1167
1168         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, output_token.length);
1169
1170         dump_data_pw("gensec_gssapi_sign_packet: sig\n", sig->data, sig->length);
1171
1172         gss_release_buffer(&min_stat, &output_token);
1173
1174         return NT_STATUS_OK;
1175 }
1176
1177 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1178                                            const uint8_t *data, size_t length,
1179                                            const uint8_t *whole_pdu, size_t pdu_length,
1180                                            const DATA_BLOB *sig)
1181 {
1182         struct gensec_gssapi_state *gensec_gssapi_state
1183                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1184         OM_uint32 maj_stat, min_stat;
1185         gss_buffer_desc input_token;
1186         gss_buffer_desc input_message;
1187         gss_qop_t qop_state;
1188
1189         dump_data_pw("gensec_gssapi_check_packet: sig\n", sig->data, sig->length);
1190
1191         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1192                 input_message.length = pdu_length;
1193                 input_message.value = discard_const(whole_pdu);
1194         } else {
1195                 input_message.length = length;
1196                 input_message.value = discard_const(data);
1197         }
1198
1199         input_token.length = sig->length;
1200         input_token.value = sig->data;
1201
1202         maj_stat = gss_verify_mic(&min_stat,
1203                               gensec_gssapi_state->gssapi_context,
1204                               &input_message,
1205                               &input_token,
1206                               &qop_state);
1207         if (GSS_ERROR(maj_stat)) {
1208                 char *error_string = gssapi_error_string(NULL, maj_stat, min_stat, gensec_gssapi_state->gss_oid);
1209                 DEBUG(1, ("GSS VerifyMic failed: %s\n", error_string));
1210                 talloc_free(error_string);
1211
1212                 return NT_STATUS_ACCESS_DENIED;
1213         }
1214
1215         return NT_STATUS_OK;
1216 }
1217
1218 /* Try to figure out what features we actually got on the connection */
1219 static bool gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1220                                        uint32_t feature)
1221 {
1222         struct gensec_gssapi_state *gensec_gssapi_state
1223                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1224         if (feature & GENSEC_FEATURE_SIGN) {
1225                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1226                 if (gensec_gssapi_state->sasl
1227                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1228                         return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1229                                 && (gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG));
1230                 }
1231                 return gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG;
1232         }
1233         if (feature & GENSEC_FEATURE_SEAL) {
1234                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1235                 if (gensec_gssapi_state->sasl
1236                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1237                         return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1238                                  && (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG));
1239                 }
1240                 return gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG;
1241         }
1242         if (feature & GENSEC_FEATURE_SESSION_KEY) {
1243                 /* Only for GSSAPI/Krb5 */
1244                 if (smb_gss_oid_equal(gensec_gssapi_state->gss_oid,
1245                                       gss_mech_krb5)) {
1246                         return true;
1247                 }
1248         }
1249         if (feature & GENSEC_FEATURE_DCE_STYLE) {
1250                 return gensec_gssapi_state->gss_got_flags & GSS_C_DCE_STYLE;
1251         }
1252         if (feature & GENSEC_FEATURE_NEW_SPNEGO) {
1253                 NTSTATUS status;
1254                 uint32_t keytype;
1255
1256                 if (!(gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG)) {
1257                         return false;
1258                 }
1259
1260                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "force_new_spnego", false)) {
1261                         return true;
1262                 }
1263                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "disable_new_spnego", false)) {
1264                         return false;
1265                 }
1266
1267                 status = gssapi_get_session_key(gensec_gssapi_state,
1268                                                 gensec_gssapi_state->gssapi_context, NULL, &keytype);
1269                 /*
1270                  * We should do a proper sig on the mechListMic unless
1271                  * we know we have to be backwards compatible with
1272                  * earlier windows versions.
1273                  *
1274                  * Negotiating a non-krb5
1275                  * mech for example should be regarded as having
1276                  * NEW_SPNEGO
1277                  */
1278                 if (NT_STATUS_IS_OK(status)) {
1279                         switch (keytype) {
1280                         case ENCTYPE_DES_CBC_CRC:
1281                         case ENCTYPE_DES_CBC_MD5:
1282                         case ENCTYPE_ARCFOUR_HMAC:
1283                         case ENCTYPE_DES3_CBC_SHA1:
1284                                 return false;
1285                         }
1286                 }
1287                 return true;
1288         }
1289         /* We can always do async (rather than strict request/reply) packets.  */
1290         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1291                 return true;
1292         }
1293         if (feature & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1294                 if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
1295                         /* TODO: implement this using gss_wrap_iov() */
1296                         return false;
1297                 }
1298
1299                 if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
1300                         return true;
1301                 }
1302
1303                 return false;
1304         }
1305         return false;
1306 }
1307
1308 static NTTIME gensec_gssapi_expire_time(struct gensec_security *gensec_security)
1309 {
1310         struct gensec_gssapi_state *gensec_gssapi_state =
1311                 talloc_get_type_abort(gensec_security->private_data,
1312                 struct gensec_gssapi_state);
1313
1314         return gensec_gssapi_state->expire_time;
1315 }
1316
1317 /*
1318  * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1319  * (for encrypting some passwords).
1320  *
1321  * This breaks all the abstractions, but what do you expect...
1322  */
1323 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1324                                           TALLOC_CTX *mem_ctx,
1325                                           DATA_BLOB *session_key)
1326 {
1327         struct gensec_gssapi_state *gensec_gssapi_state
1328                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1329         return gssapi_get_session_key(mem_ctx, gensec_gssapi_state->gssapi_context, session_key, NULL);
1330 }
1331
1332 /* Get some basic (and authorization) information about the user on
1333  * this session.  This uses either the PAC (if present) or a local
1334  * database lookup */
1335 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1336                                            TALLOC_CTX *mem_ctx,
1337                                            struct auth_session_info **_session_info)
1338 {
1339         NTSTATUS nt_status;
1340         TALLOC_CTX *tmp_ctx;
1341         struct gensec_gssapi_state *gensec_gssapi_state
1342                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1343         struct auth_session_info *session_info = NULL;
1344         OM_uint32 maj_stat, min_stat;
1345         DATA_BLOB pac_blob, *pac_blob_ptr = NULL;
1346
1347         gss_buffer_desc name_token;
1348         char *principal_string;
1349
1350         tmp_ctx = talloc_named(mem_ctx, 0, "gensec_gssapi_session_info context");
1351         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
1352
1353         maj_stat = gss_display_name (&min_stat,
1354                                      gensec_gssapi_state->client_name,
1355                                      &name_token,
1356                                      NULL);
1357         if (GSS_ERROR(maj_stat)) {
1358                 DEBUG(1, ("GSS display_name failed: %s\n",
1359                           gssapi_error_string(tmp_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1360                 talloc_free(tmp_ctx);
1361                 return NT_STATUS_FOOBAR;
1362         }
1363
1364         principal_string = talloc_strndup(tmp_ctx,
1365                                           (const char *)name_token.value,
1366                                           name_token.length);
1367
1368         gss_release_buffer(&min_stat, &name_token);
1369
1370         if (!principal_string) {
1371                 talloc_free(tmp_ctx);
1372                 return NT_STATUS_NO_MEMORY;
1373         }
1374
1375         nt_status = gssapi_obtain_pac_blob(tmp_ctx,  gensec_gssapi_state->gssapi_context,
1376                                            gensec_gssapi_state->client_name,
1377                                            &pac_blob);
1378
1379         /* IF we have the PAC - otherwise we need to get this
1380          * data from elsewere - local ldb, or (TODO) lookup of some
1381          * kind...
1382          */
1383         if (NT_STATUS_IS_OK(nt_status)) {
1384                 pac_blob_ptr = &pac_blob;
1385         }
1386         nt_status = gensec_generate_session_info_pac(tmp_ctx,
1387                                                      gensec_security,
1388                                                      gensec_gssapi_state->smb_krb5_context,
1389                                                      pac_blob_ptr, principal_string,
1390                                                      gensec_get_remote_address(gensec_security),
1391                                                      &session_info);
1392         if (!NT_STATUS_IS_OK(nt_status)) {
1393                 talloc_free(tmp_ctx);
1394                 return nt_status;
1395         }
1396
1397         nt_status = gensec_gssapi_session_key(gensec_security, session_info, &session_info->session_key);
1398         if (!NT_STATUS_IS_OK(nt_status)) {
1399                 talloc_free(tmp_ctx);
1400                 return nt_status;
1401         }
1402
1403         if (!(gensec_gssapi_state->gss_got_flags & GSS_C_DELEG_FLAG)) {
1404                 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1405         } else {
1406                 krb5_error_code ret;
1407                 const char *error_string;
1408
1409                 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1410                 session_info->credentials = cli_credentials_init(session_info);
1411                 if (!session_info->credentials) {
1412                         talloc_free(tmp_ctx);
1413                         return NT_STATUS_NO_MEMORY;
1414                 }
1415
1416                 cli_credentials_set_conf(session_info->credentials, gensec_security->settings->lp_ctx);
1417                 /* Just so we don't segfault trying to get at a username */
1418                 cli_credentials_set_anonymous(session_info->credentials);
1419
1420                 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1421                                                            gensec_security->settings->lp_ctx,
1422                                                            gensec_gssapi_state->delegated_cred_handle,
1423                                                            CRED_SPECIFIED, &error_string);
1424                 if (ret) {
1425                         talloc_free(tmp_ctx);
1426                         DEBUG(2,("Failed to get gss creds: %s\n", error_string));
1427                         return NT_STATUS_NO_MEMORY;
1428                 }
1429
1430                 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1431                 cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
1432
1433                 /* It has been taken from this place... */
1434                 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1435         }
1436         *_session_info = talloc_steal(mem_ctx, session_info);
1437         talloc_free(tmp_ctx);
1438
1439         return NT_STATUS_OK;
1440 }
1441
1442 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
1443 {
1444         struct gensec_gssapi_state *gensec_gssapi_state
1445                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1446         NTSTATUS status;
1447
1448         if (gensec_gssapi_state->sig_size) {
1449                 return gensec_gssapi_state->sig_size;
1450         }
1451
1452         if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1453                 gensec_gssapi_state->sig_size = 45;
1454         } else {
1455                 gensec_gssapi_state->sig_size = 37;
1456         }
1457
1458         status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1459         if (!NT_STATUS_IS_OK(status)) {
1460                 return gensec_gssapi_state->sig_size;
1461         }
1462
1463         if (gensec_gssapi_state->lucid->protocol == 1) {
1464                 if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1465                         /*
1466                          * TODO: windows uses 76 here, but we don't know
1467                          *       gss_wrap works with aes keys yet
1468                          */
1469                         gensec_gssapi_state->sig_size = 76;
1470                 } else {
1471                         gensec_gssapi_state->sig_size = 28;
1472                 }
1473         } else if (gensec_gssapi_state->lucid->protocol == 0) {
1474                 switch (gensec_gssapi_state->lucid->rfc1964_kd.ctx_key.type) {
1475                 case ENCTYPE_DES_CBC_CRC:
1476                 case ENCTYPE_ARCFOUR_HMAC:
1477                 case ENCTYPE_ARCFOUR_HMAC_EXP:
1478                         if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1479                                 gensec_gssapi_state->sig_size = 45;
1480                         } else {
1481                                 gensec_gssapi_state->sig_size = 37;
1482                         }
1483                         break;
1484 #ifdef SAMBA4_USES_HEIMDAL
1485                 case ENCTYPE_OLD_DES3_CBC_SHA1:
1486                         if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1487                                 gensec_gssapi_state->sig_size = 57;
1488                         } else {
1489                                 gensec_gssapi_state->sig_size = 49;
1490                         }
1491                         break;
1492 #endif
1493                 }
1494         }
1495
1496         return gensec_gssapi_state->sig_size;
1497 }
1498
1499 static const char *gensec_gssapi_krb5_oids[] = {
1500         GENSEC_OID_KERBEROS5_OLD,
1501         GENSEC_OID_KERBEROS5,
1502         NULL
1503 };
1504
1505 static const char *gensec_gssapi_spnego_oids[] = {
1506         GENSEC_OID_SPNEGO,
1507         NULL
1508 };
1509
1510 /* As a server, this could in theory accept any GSSAPI mech */
1511 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1512         .name           = "gssapi_spnego",
1513         .sasl_name      = "GSS-SPNEGO",
1514         .auth_type      = DCERPC_AUTH_TYPE_SPNEGO,
1515         .oid            = gensec_gssapi_spnego_oids,
1516         .client_start   = gensec_gssapi_client_start,
1517         .server_start   = gensec_gssapi_server_start,
1518         .magic          = gensec_magic_check_krb5_oid,
1519         .update         = gensec_gssapi_update,
1520         .session_key    = gensec_gssapi_session_key,
1521         .session_info   = gensec_gssapi_session_info,
1522         .sign_packet    = gensec_gssapi_sign_packet,
1523         .check_packet   = gensec_gssapi_check_packet,
1524         .seal_packet    = gensec_gssapi_seal_packet,
1525         .unseal_packet  = gensec_gssapi_unseal_packet,
1526         .wrap           = gensec_gssapi_wrap,
1527         .unwrap         = gensec_gssapi_unwrap,
1528         .have_feature   = gensec_gssapi_have_feature,
1529         .expire_time    = gensec_gssapi_expire_time,
1530         .enabled        = false,
1531         .kerberos       = true,
1532         .priority       = GENSEC_GSSAPI
1533 };
1534
1535 /* As a server, this could in theory accept any GSSAPI mech */
1536 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1537         .name           = "gssapi_krb5",
1538         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
1539         .oid            = gensec_gssapi_krb5_oids,
1540         .client_start   = gensec_gssapi_client_start,
1541         .server_start   = gensec_gssapi_server_start,
1542         .magic          = gensec_magic_check_krb5_oid,
1543         .update         = gensec_gssapi_update,
1544         .session_key    = gensec_gssapi_session_key,
1545         .session_info   = gensec_gssapi_session_info,
1546         .sig_size       = gensec_gssapi_sig_size,
1547         .sign_packet    = gensec_gssapi_sign_packet,
1548         .check_packet   = gensec_gssapi_check_packet,
1549         .seal_packet    = gensec_gssapi_seal_packet,
1550         .unseal_packet  = gensec_gssapi_unseal_packet,
1551         .wrap           = gensec_gssapi_wrap,
1552         .unwrap         = gensec_gssapi_unwrap,
1553         .have_feature   = gensec_gssapi_have_feature,
1554         .expire_time    = gensec_gssapi_expire_time,
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         .expire_time      = gensec_gssapi_expire_time,
1575         .enabled          = true,
1576         .kerberos         = true,
1577         .priority         = GENSEC_GSSAPI
1578 };
1579
1580 _PUBLIC_ NTSTATUS gensec_gssapi_init(void)
1581 {
1582         NTSTATUS ret;
1583
1584         ret = gensec_register(&gensec_gssapi_spnego_security_ops);
1585         if (!NT_STATUS_IS_OK(ret)) {
1586                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1587                         gensec_gssapi_spnego_security_ops.name));
1588                 return ret;
1589         }
1590
1591         ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1592         if (!NT_STATUS_IS_OK(ret)) {
1593                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1594                         gensec_gssapi_krb5_security_ops.name));
1595                 return ret;
1596         }
1597
1598         ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1599         if (!NT_STATUS_IS_OK(ret)) {
1600                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1601                         gensec_gssapi_sasl_krb5_security_ops.name));
1602                 return ret;
1603         }
1604
1605         return ret;
1606 }