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 = { 0, NULL };
 429         gss_buffer_desc output_token = { 0, NULL };
 430
 431         gss_OID gss_oid_p = NULL;
 432         OM_uint32 time_req = 0;
 433         OM_uint32 time_rec = 0;
 434         struct timeval tv;
 435
 436         time_req = gensec_setting_int(gensec_security->settings,
 437                                       "gensec_gssapi", "requested_life_time",
 438                                       time_req);
 439
 440         input_token.length = in.length;
 441         input_token.value = in.data;
 442
 443         switch (gensec_gssapi_state->sasl_state) {
 444         case STAGE_GSS_NEG:
 445         {
 446                 switch (gensec_security->gensec_role) {
 447                 case GENSEC_CLIENT:
 448                 {
 449 #ifdef SAMBA4_USES_HEIMDAL
 450                         struct gsskrb5_send_to_kdc send_to_kdc;
 451 #endif
 452                         krb5_error_code ret;
 453
 454                         nt_status = gensec_gssapi_client_creds(gensec_security, ev);
 455                         if (!NT_STATUS_IS_OK(nt_status)) {
 456                                 return nt_status;
 457                         }
 458
 459 #ifdef SAMBA4_USES_HEIMDAL
 460                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 461                         send_to_kdc.ptr = ev;
 462
 463                         min_stat = gsskrb5_set_send_to_kdc(&send_to_kdc);
 464                         if (min_stat) {
 465                                 DEBUG(1,("gensec_gssapi_update: gsskrb5_set_send_to_kdc failed\n"));
 466                                 return NT_STATUS_INTERNAL_ERROR;
 467                         }
 468 #endif
 469                         maj_stat = gss_init_sec_context(&min_stat,
 470                                                         gensec_gssapi_state->client_cred->creds,
 471                                                         &gensec_gssapi_state->gssapi_context,
 472                                                         gensec_gssapi_state->server_name,
 473                                                         gensec_gssapi_state->gss_oid,
 474                                                         gensec_gssapi_state->gss_want_flags,
 475                                                         time_req,
 476                                                         gensec_gssapi_state->input_chan_bindings,
 477                                                         &input_token,
 478                                                         &gss_oid_p,
 479                                                         &output_token,
 480                                                         &gensec_gssapi_state->gss_got_flags, /* ret flags */
 481                                                         &time_rec);
 482                         if (gss_oid_p) {
 483                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 484                         }
 485
 486 #ifdef SAMBA4_USES_HEIMDAL
 487                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 488                         send_to_kdc.ptr = NULL;
 489
 490                         ret = gsskrb5_set_send_to_kdc(&send_to_kdc);
 491                         if (ret) {
 492                                 DEBUG(1,("gensec_gssapi_update: gsskrb5_set_send_to_kdc failed\n"));
 493                                 return NT_STATUS_INTERNAL_ERROR;
 494                         }
 495 #endif
 496                         break;
 497                 }
 498                 case GENSEC_SERVER:
 499                 {
 500                         maj_stat = gss_accept_sec_context(&min_stat,
 501                                                           &gensec_gssapi_state->gssapi_context,
 502                                                           gensec_gssapi_state->server_cred->creds,
 503                                                           &input_token,
 504                                                           gensec_gssapi_state->input_chan_bindings,
 505                                                           &gensec_gssapi_state->client_name,
 506                                                           &gss_oid_p,
 507                                                           &output_token,
 508                                                           &gensec_gssapi_state->gss_got_flags,
 509                                                           &time_rec,
 510                                                           &gensec_gssapi_state->delegated_cred_handle);
 511                         if (gss_oid_p) {
 512                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 513                         }
 514                         break;
 515                 }
 516                 default:
 517                         return NT_STATUS_INVALID_PARAMETER;
 518
 519                 }
 520
 521                 gensec_gssapi_state->gss_exchange_count++;
 522
 523                 if (maj_stat == GSS_S_COMPLETE) {
 524                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 525                         gss_release_buffer(&min_stat2, &output_token);
 526
 527                         if (gensec_gssapi_state->gss_got_flags & GSS_C_DELEG_FLAG) {
 528                                 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
 529                         } else {
 530                                 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
 531                         }
 532
 533                         tv = timeval_current_ofs(time_rec, 0);
 534                         gensec_gssapi_state->expire_time = timeval_to_nttime(&tv);
 535
 536                         /* We may have been invoked as SASL, so there
 537                          * is more work to do */
 538                         if (gensec_gssapi_state->sasl) {
 539                                 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
 540                                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 541                         } else {
 542                                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 543
 544                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 545                                         DEBUG(5, ("GSSAPI Connection will be cryptographically sealed\n"));
 546                                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 547                                         DEBUG(5, ("GSSAPI Connection will be cryptographically signed\n"));
 548                                 } else {
 549                                         DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
 550                                 }
 551
 552                                 return NT_STATUS_OK;
 553                         }
 554                 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
 555                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 556                         gss_release_buffer(&min_stat2, &output_token);
 557
 558                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 559                 } else if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
 560                         gss_cred_id_t creds = NULL;
 561                         gss_name_t name;
 562                         gss_buffer_desc buffer;
 563                         OM_uint32 lifetime = 0;
 564                         gss_cred_usage_t usage;
 565                         const char *role = NULL;
 566                         DEBUG(0, ("GSS %s Update(krb5)(%d) Update failed, credentials expired during GSSAPI handshake!\n",
 567                                   role,
 568                                   gensec_gssapi_state->gss_exchange_count));
 569
 570
 571                         switch (gensec_security->gensec_role) {
 572                         case GENSEC_CLIENT:
 573                                 creds = gensec_gssapi_state->client_cred->creds;
 574                                 role = "client";
 575                                 break;
 576                         case GENSEC_SERVER:
 577                                 creds = gensec_gssapi_state->server_cred->creds;
 578                                 role = "server";
 579                                 break;
 580                         }
 581
 582                         maj_stat = gss_inquire_cred(&min_stat,
 583                                                     creds,
 584                                                     &name, &lifetime, &usage, NULL);
 585
 586                         if (maj_stat == GSS_S_COMPLETE) {
 587                                 const char *usage_string = NULL;
 588                                 switch (usage) {
 589                                 case GSS_C_BOTH:
 590                                         usage_string = "GSS_C_BOTH";
 591                                         break;
 592                                 case GSS_C_ACCEPT:
 593                                         usage_string = "GSS_C_ACCEPT";
 594                                         break;
 595                                 case GSS_C_INITIATE:
 596                                         usage_string = "GSS_C_INITIATE";
 597                                         break;
 598                                 }
 599                                 maj_stat = gss_display_name(&min_stat, name, &buffer, NULL);
 600                                 if (maj_stat) {
 601                                         buffer.value = NULL;
 602                                         buffer.length = 0;
 603                                 }
 604                                 if (lifetime > 0) {
 605                                         DEBUG(0, ("GSSAPI gss_inquire_cred indicates expiry of %*.*s in %u sec for %s\n",
 606                                                   (int)buffer.length, (int)buffer.length, (char *)buffer.value,
 607                                                   lifetime, usage_string));
 608                                 } else {
 609                                         DEBUG(0, ("GSSAPI gss_inquire_cred indicates %*.*s has already expired for %s\n",
 610                                                   (int)buffer.length, (int)buffer.length, (char *)buffer.value,
 611                                                   usage_string));
 612                                 }
 613                                 gss_release_buffer(&min_stat, &buffer);
 614                                 gss_release_name(&min_stat, &name);
 615                         } else if (maj_stat != GSS_S_COMPLETE) {
 616                                 DEBUG(0, ("inquiry of credential lifefime via GSSAPI gss_inquire_cred failed: %s\n",
 617                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 618                         }
 619                         return NT_STATUS_INVALID_PARAMETER;
 620                 } else if (smb_gss_oid_equal(gensec_gssapi_state->gss_oid,
 621                                              gss_mech_krb5)) {
 622                         switch (min_stat) {
 623                         case KRB5KRB_AP_ERR_TKT_NYV:
 624                                 DEBUG(1, ("Error with ticket to contact %s: possible clock skew between us and the KDC or target server: %s\n",
 625                                           gensec_gssapi_state->target_principal,
 626                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 627                                 return NT_STATUS_TIME_DIFFERENCE_AT_DC; /* Make SPNEGO ignore us, we can't go any further here */
 628                         case KRB5KRB_AP_ERR_TKT_EXPIRED:
 629                                 DEBUG(1, ("Error with ticket to contact %s: ticket is expired, possible clock skew between us and the KDC or target server: %s\n",
 630                                           gensec_gssapi_state->target_principal,
 631                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 632                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 633                         case KRB5_KDC_UNREACH:
 634                                 DEBUG(3, ("Cannot reach a KDC we require in order to obtain a ticket to %s: %s\n",
 635                                           gensec_gssapi_state->target_principal,
 636                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 637                                 return NT_STATUS_NO_LOGON_SERVERS; /* Make SPNEGO ignore us, we can't go any further here */
 638                         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 639                                 DEBUG(3, ("Server %s is not registered with our KDC: %s\n",
 640                                           gensec_gssapi_state->target_principal,
 641                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 642                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 643                         case KRB5KRB_AP_ERR_MSG_TYPE:
 644                                 /* garbage input, possibly from the auto-mech detection */
 645                                 return NT_STATUS_INVALID_PARAMETER;
 646                         default:
 647                                 DEBUG(1, ("GSS %s Update(krb5)(%d) Update failed: %s\n",
 648                                           gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 649                                           gensec_gssapi_state->gss_exchange_count,
 650                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 651                                 return nt_status;
 652                         }
 653                 } else {
 654                         DEBUG(1, ("GSS %s Update(%d) failed: %s\n",
 655                                   gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 656                                   gensec_gssapi_state->gss_exchange_count,
 657                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 658                         return nt_status;
 659                 }
 660                 break;
 661         }
 662
 663         /* These last two stages are only done if we were invoked as SASL */
 664         case STAGE_SASL_SSF_NEG:
 665         {
 666                 switch (gensec_security->gensec_role) {
 667                 case GENSEC_CLIENT:
 668                 {
 669                         uint8_t maxlength_proposed[4];
 670                         uint8_t maxlength_accepted[4];
 671                         uint8_t security_supported;
 672                         int conf_state;
 673                         gss_qop_t qop_state;
 674                         input_token.length = in.length;
 675                         input_token.value = in.data;
 676
 677                         /* As a client, we have just send a
 678                          * zero-length blob to the server (after the
 679                          * normal GSSAPI exchange), and it has replied
 680                          * with it's SASL negotiation */
 681
 682                         maj_stat = gss_unwrap(&min_stat,
 683                                               gensec_gssapi_state->gssapi_context,
 684                                               &input_token,
 685                                               &output_token,
 686                                               &conf_state,
 687                                               &qop_state);
 688                         if (GSS_ERROR(maj_stat)) {
 689                                 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 690                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 691                                 return NT_STATUS_ACCESS_DENIED;
 692                         }
 693
 694                         if (output_token.length < 4) {
 695                                 return NT_STATUS_INVALID_PARAMETER;
 696                         }
 697
 698                         memcpy(maxlength_proposed, output_token.value, 4);
 699                         gss_release_buffer(&min_stat, &output_token);
 700
 701                         /* first byte is the proposed security */
 702                         security_supported = maxlength_proposed[0];
 703                         maxlength_proposed[0] = '\0';
 704
 705                         /* Rest is the proposed max wrap length */
 706                         gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
 707                                                                      gensec_gssapi_state->max_wrap_buf_size);
 708                         gensec_gssapi_state->sasl_protection = 0;
 709                         if (security_supported & NEG_SEAL) {
 710                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 711                                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 712                                 }
 713                         }
 714                         if (security_supported & NEG_SIGN) {
 715                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 716                                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 717                                 }
 718                         }
 719                         if (security_supported & NEG_NONE) {
 720                                 gensec_gssapi_state->sasl_protection |= NEG_NONE;
 721                         }
 722                         if (gensec_gssapi_state->sasl_protection == 0) {
 723                                 DEBUG(1, ("Remote server does not support unprotected connections\n"));
 724                                 return NT_STATUS_ACCESS_DENIED;
 725                         }
 726
 727                         /* Send back the negotiated max length */
 728
 729                         RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
 730
 731                         maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
 732
 733                         input_token.value = maxlength_accepted;
 734                         input_token.length = sizeof(maxlength_accepted);
 735
 736                         maj_stat = gss_wrap(&min_stat,
 737                                             gensec_gssapi_state->gssapi_context,
 738                                             false,
 739                                             GSS_C_QOP_DEFAULT,
 740                                             &input_token,
 741                                             &conf_state,
 742                                             &output_token);
 743                         if (GSS_ERROR(maj_stat)) {
 744                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 745                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 746                                 return NT_STATUS_ACCESS_DENIED;
 747                         }
 748
 749                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 750                         gss_release_buffer(&min_stat, &output_token);
 751
 752                         /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 753                         gensec_gssapi_state->sasl_state = STAGE_DONE;
 754
 755                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 756                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically sealed\n"));
 757                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 758                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically signed\n"));
 759                         } else {
 760                                 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographically protection\n"));
 761                         }
 762
 763                         return NT_STATUS_OK;
 764                 }
 765                 case GENSEC_SERVER:
 766                 {
 767                         uint8_t maxlength_proposed[4];
 768                         uint8_t security_supported = 0x0;
 769                         int conf_state;
 770
 771                         /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
 772                         if (in.length != 0) {
 773                                 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
 774                         }
 775
 776                         /* Give the client some idea what we will support */
 777
 778                         RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
 779                         /* first byte is the proposed security */
 780                         maxlength_proposed[0] = '\0';
 781
 782                         gensec_gssapi_state->sasl_protection = 0;
 783                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 784                                 security_supported |= NEG_SEAL;
 785                         }
 786                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 787                                 security_supported |= NEG_SIGN;
 788                         }
 789                         if (security_supported == 0) {
 790                                 /* If we don't support anything, this must be 0 */
 791                                 RSIVAL(maxlength_proposed, 0, 0x0);
 792                         }
 793
 794                         /* TODO:  We may not wish to support this */
 795                         security_supported |= NEG_NONE;
 796                         maxlength_proposed[0] = security_supported;
 797
 798                         input_token.value = maxlength_proposed;
 799                         input_token.length = sizeof(maxlength_proposed);
 800
 801                         maj_stat = gss_wrap(&min_stat,
 802                                             gensec_gssapi_state->gssapi_context,
 803                                             false,
 804                                             GSS_C_QOP_DEFAULT,
 805                                             &input_token,
 806                                             &conf_state,
 807                                             &output_token);
 808                         if (GSS_ERROR(maj_stat)) {
 809                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 810                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 811                                 return NT_STATUS_ACCESS_DENIED;
 812                         }
 813
 814                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 815                         gss_release_buffer(&min_stat, &output_token);
 816
 817                         gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
 818                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 819                 }
 820                 default:
 821                         return NT_STATUS_INVALID_PARAMETER;
 822
 823                 }
 824         }
 825         /* This is s server-only stage */
 826         case STAGE_SASL_SSF_ACCEPT:
 827         {
 828                 uint8_t maxlength_accepted[4];
 829                 uint8_t security_accepted;
 830                 int conf_state;
 831                 gss_qop_t qop_state;
 832                 input_token.length = in.length;
 833                 input_token.value = in.data;
 834
 835                 maj_stat = gss_unwrap(&min_stat,
 836                                       gensec_gssapi_state->gssapi_context,
 837                                       &input_token,
 838                                       &output_token,
 839                                       &conf_state,
 840                                       &qop_state);
 841                 if (GSS_ERROR(maj_stat)) {
 842                         DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 843                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 844                         return NT_STATUS_ACCESS_DENIED;
 845                 }
 846
 847                 if (output_token.length < 4) {
 848                         return NT_STATUS_INVALID_PARAMETER;
 849                 }
 850
 851                 memcpy(maxlength_accepted, output_token.value, 4);
 852                 gss_release_buffer(&min_stat, &output_token);
 853
 854                 /* first byte is the proposed security */
 855                 security_accepted = maxlength_accepted[0];
 856                 maxlength_accepted[0] = '\0';
 857
 858                 /* Rest is the proposed max wrap length */
 859                 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
 860                                                              gensec_gssapi_state->max_wrap_buf_size);
 861
 862                 gensec_gssapi_state->sasl_protection = 0;
 863                 if (security_accepted & NEG_SEAL) {
 864                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 865                                 DEBUG(1, ("Remote client wanted seal, but gensec refused\n"));
 866                                 return NT_STATUS_ACCESS_DENIED;
 867                         }
 868                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 869                 }
 870                 if (security_accepted & NEG_SIGN) {
 871                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 872                                 DEBUG(1, ("Remote client wanted sign, but gensec refused\n"));
 873                                 return NT_STATUS_ACCESS_DENIED;
 874                         }
 875                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 876                 }
 877                 if (security_accepted & NEG_NONE) {
 878                         gensec_gssapi_state->sasl_protection |= NEG_NONE;
 879                 }
 880
 881                 /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 882                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 883                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 884                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically sealed\n"));
 885                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 886                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically signed\n"));
 887                 } else {
 888                         DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
 889                 }
 890
 891                 *out = data_blob(NULL, 0);
 892                 return NT_STATUS_OK;
 893         }
 894         default:
 895                 return NT_STATUS_INVALID_PARAMETER;
 896         }
 897 }
 898
 899 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
 900                                    TALLOC_CTX *mem_ctx,
 901                                    const DATA_BLOB *in,
 902                                    DATA_BLOB *out)
 903 {
 904         struct gensec_gssapi_state *gensec_gssapi_state
 905                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 906         OM_uint32 maj_stat, min_stat;
 907         gss_buffer_desc input_token, output_token;
 908         int conf_state;
 909         input_token.length = in->length;
 910         input_token.value = in->data;
 911
 912         maj_stat = gss_wrap(&min_stat,
 913                             gensec_gssapi_state->gssapi_context,
 914                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 915                             GSS_C_QOP_DEFAULT,
 916                             &input_token,
 917                             &conf_state,
 918                             &output_token);
 919         if (GSS_ERROR(maj_stat)) {
 920                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 921                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 922                 return NT_STATUS_ACCESS_DENIED;
 923         }
 924
 925         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 926         gss_release_buffer(&min_stat, &output_token);
 927
 928         if (gensec_gssapi_state->sasl) {
 929                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 930                 if (max_wrapped_size < out->length) {
 931                         DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
 932                                   (unsigned)in->length,
 933                                   (unsigned)out->length,
 934                                   (unsigned int)max_wrapped_size));
 935                         return NT_STATUS_INVALID_PARAMETER;
 936                 }
 937         }
 938
 939         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 940             && !conf_state) {
 941                 return NT_STATUS_ACCESS_DENIED;
 942         }
 943         return NT_STATUS_OK;
 944 }
 945
 946 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
 947                                      TALLOC_CTX *mem_ctx,
 948                                      const DATA_BLOB *in,
 949                                      DATA_BLOB *out)
 950 {
 951         struct gensec_gssapi_state *gensec_gssapi_state
 952                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 953         OM_uint32 maj_stat, min_stat;
 954         gss_buffer_desc input_token, output_token;
 955         int conf_state;
 956         gss_qop_t qop_state;
 957         input_token.length = in->length;
 958         input_token.value = in->data;
 959
 960         if (gensec_gssapi_state->sasl) {
 961                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 962                 if (max_wrapped_size < in->length) {
 963                         DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
 964                         return NT_STATUS_INVALID_PARAMETER;
 965                 }
 966         }
 967
 968         maj_stat = gss_unwrap(&min_stat,
 969                               gensec_gssapi_state->gssapi_context,
 970                               &input_token,
 971                               &output_token,
 972                               &conf_state,
 973                               &qop_state);
 974         if (GSS_ERROR(maj_stat)) {
 975                 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
 976                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 977                 return NT_STATUS_ACCESS_DENIED;
 978         }
 979
 980         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 981         gss_release_buffer(&min_stat, &output_token);
 982
 983         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 984             && !conf_state) {
 985                 return NT_STATUS_ACCESS_DENIED;
 986         }
 987         return NT_STATUS_OK;
 988 }
 989
 990 /* Find out the maximum input size negotiated on this connection */
 991
 992 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
 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         OM_uint32 max_input_size;
 998
 999         maj_stat = gss_wrap_size_limit(&min_stat,
1000                                        gensec_gssapi_state->gssapi_context,
1001                                        gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
1002                                        GSS_C_QOP_DEFAULT,
1003                                        gensec_gssapi_state->max_wrap_buf_size,
1004                                        &max_input_size);
1005         if (GSS_ERROR(maj_stat)) {
1006                 TALLOC_CTX *mem_ctx = talloc_new(NULL);
1007                 DEBUG(1, ("gensec_gssapi_max_input_size: determining signature size with gss_wrap_size_limit failed: %s\n",
1008                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1009                 talloc_free(mem_ctx);
1010                 return 0;
1011         }
1012
1013         return max_input_size;
1014 }
1015
1016 /* Find out the maximum output size negotiated on this connection */
1017 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
1018 {
1019         struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
1020         return gensec_gssapi_state->max_wrap_buf_size;
1021 }
1022
1023 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
1024                                           TALLOC_CTX *mem_ctx,
1025                                           uint8_t *data, size_t length,
1026                                           const uint8_t *whole_pdu, size_t pdu_length,
1027                                           DATA_BLOB *sig)
1028 {
1029         struct gensec_gssapi_state *gensec_gssapi_state
1030                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1031         OM_uint32 maj_stat, min_stat;
1032         gss_buffer_desc input_token, output_token;
1033         int conf_state;
1034         ssize_t sig_length;
1035
1036         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1037                 DEBUG(1, ("gensec_gssapi_seal_packet: "
1038                           "GENSEC_FEATURE_SIGN_PKT_HEADER not supported\n"));
1039                 return NT_STATUS_ACCESS_DENIED;
1040         }
1041
1042         input_token.length = length;
1043         input_token.value = data;
1044
1045         maj_stat = gss_wrap(&min_stat,
1046                             gensec_gssapi_state->gssapi_context,
1047                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
1048                             GSS_C_QOP_DEFAULT,
1049                             &input_token,
1050                             &conf_state,
1051                             &output_token);
1052         if (GSS_ERROR(maj_stat)) {
1053                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
1054                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1055                 return NT_STATUS_ACCESS_DENIED;
1056         }
1057
1058         if (output_token.length < input_token.length) {
1059                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
1060                           (long)output_token.length, (long)length));
1061                 return NT_STATUS_INTERNAL_ERROR;
1062         }
1063         sig_length = output_token.length - input_token.length;
1064
1065         memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
1066         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
1067
1068         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1069         dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
1070         dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
1071
1072         gss_release_buffer(&min_stat, &output_token);
1073
1074         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1075             && !conf_state) {
1076                 return NT_STATUS_ACCESS_DENIED;
1077         }
1078         return NT_STATUS_OK;
1079 }
1080
1081 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
1082                                             uint8_t *data, size_t length,
1083                                             const uint8_t *whole_pdu, size_t pdu_length,
1084                                             const DATA_BLOB *sig)
1085 {
1086         struct gensec_gssapi_state *gensec_gssapi_state
1087                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1088         OM_uint32 maj_stat, min_stat;
1089         gss_buffer_desc input_token, output_token;
1090         int conf_state;
1091         gss_qop_t qop_state;
1092         DATA_BLOB in;
1093
1094         dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
1095
1096         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1097                 DEBUG(1, ("gensec_gssapi_unseal_packet: "
1098                           "GENSEC_FEATURE_SIGN_PKT_HEADER not supported\n"));
1099                 return NT_STATUS_ACCESS_DENIED;
1100         }
1101
1102         in = data_blob_talloc(gensec_security, NULL, sig->length + length);
1103
1104         memcpy(in.data, sig->data, sig->length);
1105         memcpy(in.data + sig->length, data, length);
1106
1107         input_token.length = in.length;
1108         input_token.value = in.data;
1109
1110         maj_stat = gss_unwrap(&min_stat,
1111                               gensec_gssapi_state->gssapi_context,
1112                               &input_token,
1113                               &output_token,
1114                               &conf_state,
1115                               &qop_state);
1116         talloc_free(in.data);
1117         if (GSS_ERROR(maj_stat)) {
1118                 char *error_string = gssapi_error_string(NULL, maj_stat, min_stat, gensec_gssapi_state->gss_oid);
1119                 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
1120                           error_string));
1121                 talloc_free(error_string);
1122                 return NT_STATUS_ACCESS_DENIED;
1123         }
1124
1125         if (output_token.length != length) {
1126                 return NT_STATUS_INTERNAL_ERROR;
1127         }
1128
1129         memcpy(data, output_token.value, length);
1130
1131         gss_release_buffer(&min_stat, &output_token);
1132
1133         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1134             && !conf_state) {
1135                 return NT_STATUS_ACCESS_DENIED;
1136         }
1137         return NT_STATUS_OK;
1138 }
1139
1140 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1141                                           TALLOC_CTX *mem_ctx,
1142                                           const uint8_t *data, size_t length,
1143                                           const uint8_t *whole_pdu, size_t pdu_length,
1144                                           DATA_BLOB *sig)
1145 {
1146         struct gensec_gssapi_state *gensec_gssapi_state
1147                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1148         OM_uint32 maj_stat, min_stat;
1149         gss_buffer_desc input_token, output_token;
1150
1151         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1152                 input_token.length = pdu_length;
1153                 input_token.value = discard_const_p(uint8_t *, whole_pdu);
1154         } else {
1155                 input_token.length = length;
1156                 input_token.value = discard_const_p(uint8_t *, data);
1157         }
1158
1159         maj_stat = gss_get_mic(&min_stat,
1160                             gensec_gssapi_state->gssapi_context,
1161                             GSS_C_QOP_DEFAULT,
1162                             &input_token,
1163                             &output_token);
1164         if (GSS_ERROR(maj_stat)) {
1165                 DEBUG(1, ("GSS GetMic failed: %s\n",
1166                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1167                 return NT_STATUS_ACCESS_DENIED;
1168         }
1169
1170         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, output_token.length);
1171
1172         dump_data_pw("gensec_gssapi_sign_packet: sig\n", sig->data, sig->length);
1173
1174         gss_release_buffer(&min_stat, &output_token);
1175
1176         return NT_STATUS_OK;
1177 }
1178
1179 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1180                                            const uint8_t *data, size_t length,
1181                                            const uint8_t *whole_pdu, size_t pdu_length,
1182                                            const DATA_BLOB *sig)
1183 {
1184         struct gensec_gssapi_state *gensec_gssapi_state
1185                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1186         OM_uint32 maj_stat, min_stat;
1187         gss_buffer_desc input_token;
1188         gss_buffer_desc input_message;
1189         gss_qop_t qop_state;
1190
1191         dump_data_pw("gensec_gssapi_check_packet: sig\n", sig->data, sig->length);
1192
1193         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1194                 input_message.length = pdu_length;
1195                 input_message.value = discard_const(whole_pdu);
1196         } else {
1197                 input_message.length = length;
1198                 input_message.value = discard_const(data);
1199         }
1200
1201         input_token.length = sig->length;
1202         input_token.value = sig->data;
1203
1204         maj_stat = gss_verify_mic(&min_stat,
1205                               gensec_gssapi_state->gssapi_context,
1206                               &input_message,
1207                               &input_token,
1208                               &qop_state);
1209         if (GSS_ERROR(maj_stat)) {
1210                 char *error_string = gssapi_error_string(NULL, maj_stat, min_stat, gensec_gssapi_state->gss_oid);
1211                 DEBUG(1, ("GSS VerifyMic failed: %s\n", error_string));
1212                 talloc_free(error_string);
1213
1214                 return NT_STATUS_ACCESS_DENIED;
1215         }
1216
1217         return NT_STATUS_OK;
1218 }
1219
1220 /* Try to figure out what features we actually got on the connection */
1221 static bool gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1222                                        uint32_t feature)
1223 {
1224         struct gensec_gssapi_state *gensec_gssapi_state
1225                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1226         if (feature & GENSEC_FEATURE_SIGN) {
1227                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1228                 if (gensec_gssapi_state->sasl
1229                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1230                         return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1231                                 && (gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG));
1232                 }
1233                 return gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG;
1234         }
1235         if (feature & GENSEC_FEATURE_SEAL) {
1236                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1237                 if (gensec_gssapi_state->sasl
1238                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1239                         return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1240                                  && (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG));
1241                 }
1242                 return gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG;
1243         }
1244         if (feature & GENSEC_FEATURE_SESSION_KEY) {
1245                 /* Only for GSSAPI/Krb5 */
1246                 if (smb_gss_oid_equal(gensec_gssapi_state->gss_oid,
1247                                       gss_mech_krb5)) {
1248                         return true;
1249                 }
1250         }
1251         if (feature & GENSEC_FEATURE_DCE_STYLE) {
1252                 return gensec_gssapi_state->gss_got_flags & GSS_C_DCE_STYLE;
1253         }
1254         if (feature & GENSEC_FEATURE_NEW_SPNEGO) {
1255                 NTSTATUS status;
1256                 uint32_t keytype;
1257
1258                 if (!(gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG)) {
1259                         return false;
1260                 }
1261
1262                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "force_new_spnego", false)) {
1263                         return true;
1264                 }
1265                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "disable_new_spnego", false)) {
1266                         return false;
1267                 }
1268
1269                 status = gssapi_get_session_key(gensec_gssapi_state,
1270                                                 gensec_gssapi_state->gssapi_context, NULL, &keytype);
1271                 /*
1272                  * We should do a proper sig on the mechListMic unless
1273                  * we know we have to be backwards compatible with
1274                  * earlier windows versions.
1275                  *
1276                  * Negotiating a non-krb5
1277                  * mech for example should be regarded as having
1278                  * NEW_SPNEGO
1279                  */
1280                 if (NT_STATUS_IS_OK(status)) {
1281                         switch (keytype) {
1282                         case ENCTYPE_DES_CBC_CRC:
1283                         case ENCTYPE_DES_CBC_MD5:
1284                         case ENCTYPE_ARCFOUR_HMAC:
1285                         case ENCTYPE_DES3_CBC_SHA1:
1286                                 return false;
1287                         }
1288                 }
1289                 return true;
1290         }
1291         /* We can always do async (rather than strict request/reply) packets.  */
1292         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1293                 return true;
1294         }
1295         if (feature & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1296                 if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
1297                         /* TODO: implement this using gss_wrap_iov() */
1298                         return false;
1299                 }
1300
1301                 if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
1302                         return true;
1303                 }
1304
1305                 return false;
1306         }
1307         return false;
1308 }
1309
1310 static NTTIME gensec_gssapi_expire_time(struct gensec_security *gensec_security)
1311 {
1312         struct gensec_gssapi_state *gensec_gssapi_state =
1313                 talloc_get_type_abort(gensec_security->private_data,
1314                 struct gensec_gssapi_state);
1315
1316         return gensec_gssapi_state->expire_time;
1317 }
1318
1319 /*
1320  * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1321  * (for encrypting some passwords).
1322  *
1323  * This breaks all the abstractions, but what do you expect...
1324  */
1325 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1326                                           TALLOC_CTX *mem_ctx,
1327                                           DATA_BLOB *session_key)
1328 {
1329         struct gensec_gssapi_state *gensec_gssapi_state
1330                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1331         return gssapi_get_session_key(mem_ctx, gensec_gssapi_state->gssapi_context, session_key, NULL);
1332 }
1333
1334 /* Get some basic (and authorization) information about the user on
1335  * this session.  This uses either the PAC (if present) or a local
1336  * database lookup */
1337 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1338                                            TALLOC_CTX *mem_ctx,
1339                                            struct auth_session_info **_session_info)
1340 {
1341         NTSTATUS nt_status;
1342         TALLOC_CTX *tmp_ctx;
1343         struct gensec_gssapi_state *gensec_gssapi_state
1344                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1345         struct auth_session_info *session_info = NULL;
1346         OM_uint32 maj_stat, min_stat;
1347         DATA_BLOB pac_blob, *pac_blob_ptr = NULL;
1348
1349         gss_buffer_desc name_token;
1350         char *principal_string;
1351
1352         tmp_ctx = talloc_named(mem_ctx, 0, "gensec_gssapi_session_info context");
1353         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
1354
1355         maj_stat = gss_display_name (&min_stat,
1356                                      gensec_gssapi_state->client_name,
1357                                      &name_token,
1358                                      NULL);
1359         if (GSS_ERROR(maj_stat)) {
1360                 DEBUG(1, ("GSS display_name failed: %s\n",
1361                           gssapi_error_string(tmp_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1362                 talloc_free(tmp_ctx);
1363                 return NT_STATUS_FOOBAR;
1364         }
1365
1366         principal_string = talloc_strndup(tmp_ctx,
1367                                           (const char *)name_token.value,
1368                                           name_token.length);
1369
1370         gss_release_buffer(&min_stat, &name_token);
1371
1372         if (!principal_string) {
1373                 talloc_free(tmp_ctx);
1374                 return NT_STATUS_NO_MEMORY;
1375         }
1376
1377         nt_status = gssapi_obtain_pac_blob(tmp_ctx,  gensec_gssapi_state->gssapi_context,
1378                                            gensec_gssapi_state->client_name,
1379                                            &pac_blob);
1380
1381         /* IF we have the PAC - otherwise we need to get this
1382          * data from elsewere - local ldb, or (TODO) lookup of some
1383          * kind...
1384          */
1385         if (NT_STATUS_IS_OK(nt_status)) {
1386                 pac_blob_ptr = &pac_blob;
1387         }
1388         nt_status = gensec_generate_session_info_pac(tmp_ctx,
1389                                                      gensec_security,
1390                                                      gensec_gssapi_state->smb_krb5_context,
1391                                                      pac_blob_ptr, principal_string,
1392                                                      gensec_get_remote_address(gensec_security),
1393                                                      &session_info);
1394         if (!NT_STATUS_IS_OK(nt_status)) {
1395                 talloc_free(tmp_ctx);
1396                 return nt_status;
1397         }
1398
1399         nt_status = gensec_gssapi_session_key(gensec_security, session_info, &session_info->session_key);
1400         if (!NT_STATUS_IS_OK(nt_status)) {
1401                 talloc_free(tmp_ctx);
1402                 return nt_status;
1403         }
1404
1405         if (!(gensec_gssapi_state->gss_got_flags & GSS_C_DELEG_FLAG)) {
1406                 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1407         } else {
1408                 krb5_error_code ret;
1409                 const char *error_string;
1410
1411                 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1412                 session_info->credentials = cli_credentials_init(session_info);
1413                 if (!session_info->credentials) {
1414                         talloc_free(tmp_ctx);
1415                         return NT_STATUS_NO_MEMORY;
1416                 }
1417
1418                 cli_credentials_set_conf(session_info->credentials, gensec_security->settings->lp_ctx);
1419                 /* Just so we don't segfault trying to get at a username */
1420                 cli_credentials_set_anonymous(session_info->credentials);
1421
1422                 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1423                                                            gensec_security->settings->lp_ctx,
1424                                                            gensec_gssapi_state->delegated_cred_handle,
1425                                                            CRED_SPECIFIED, &error_string);
1426                 if (ret) {
1427                         talloc_free(tmp_ctx);
1428                         DEBUG(2,("Failed to get gss creds: %s\n", error_string));
1429                         return NT_STATUS_NO_MEMORY;
1430                 }
1431
1432                 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1433                 cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
1434
1435                 /* It has been taken from this place... */
1436                 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1437         }
1438         *_session_info = talloc_steal(mem_ctx, session_info);
1439         talloc_free(tmp_ctx);
1440
1441         return NT_STATUS_OK;
1442 }
1443
1444 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
1445 {
1446         struct gensec_gssapi_state *gensec_gssapi_state
1447                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1448         NTSTATUS status;
1449
1450         if (gensec_gssapi_state->sig_size) {
1451                 return gensec_gssapi_state->sig_size;
1452         }
1453
1454         if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1455                 gensec_gssapi_state->sig_size = 45;
1456         } else {
1457                 gensec_gssapi_state->sig_size = 37;
1458         }
1459
1460         status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1461         if (!NT_STATUS_IS_OK(status)) {
1462                 return gensec_gssapi_state->sig_size;
1463         }
1464
1465         if (gensec_gssapi_state->lucid->protocol == 1) {
1466                 if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1467                         /*
1468                          * TODO: windows uses 76 here, but we don't know
1469                          *       gss_wrap works with aes keys yet
1470                          */
1471                         gensec_gssapi_state->sig_size = 76;
1472                 } else {
1473                         gensec_gssapi_state->sig_size = 28;
1474                 }
1475         } else if (gensec_gssapi_state->lucid->protocol == 0) {
1476                 switch (gensec_gssapi_state->lucid->rfc1964_kd.ctx_key.type) {
1477                 case ENCTYPE_DES_CBC_CRC:
1478                 case ENCTYPE_ARCFOUR_HMAC:
1479                 case ENCTYPE_ARCFOUR_HMAC_EXP:
1480                         if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1481                                 gensec_gssapi_state->sig_size = 45;
1482                         } else {
1483                                 gensec_gssapi_state->sig_size = 37;
1484                         }
1485                         break;
1486 #ifdef SAMBA4_USES_HEIMDAL
1487                 case ENCTYPE_OLD_DES3_CBC_SHA1:
1488                         if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1489                                 gensec_gssapi_state->sig_size = 57;
1490                         } else {
1491                                 gensec_gssapi_state->sig_size = 49;
1492                         }
1493                         break;
1494 #endif
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_magic_check_krb5_oid,
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         .expire_time    = gensec_gssapi_expire_time,
1532         .enabled        = false,
1533         .kerberos       = true,
1534         .priority       = GENSEC_GSSAPI
1535 };
1536
1537 /* As a server, this could in theory accept any GSSAPI mech */
1538 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1539         .name           = "gssapi_krb5",
1540         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
1541         .oid            = gensec_gssapi_krb5_oids,
1542         .client_start   = gensec_gssapi_client_start,
1543         .server_start   = gensec_gssapi_server_start,
1544         .magic          = gensec_magic_check_krb5_oid,
1545         .update         = gensec_gssapi_update,
1546         .session_key    = gensec_gssapi_session_key,
1547         .session_info   = gensec_gssapi_session_info,
1548         .sig_size       = gensec_gssapi_sig_size,
1549         .sign_packet    = gensec_gssapi_sign_packet,
1550         .check_packet   = gensec_gssapi_check_packet,
1551         .seal_packet    = gensec_gssapi_seal_packet,
1552         .unseal_packet  = gensec_gssapi_unseal_packet,
1553         .wrap           = gensec_gssapi_wrap,
1554         .unwrap         = gensec_gssapi_unwrap,
1555         .have_feature   = gensec_gssapi_have_feature,
1556         .expire_time    = gensec_gssapi_expire_time,
1557         .enabled        = true,
1558         .kerberos       = true,
1559         .priority       = GENSEC_GSSAPI
1560 };
1561
1562 /* As a server, this could in theory accept any GSSAPI mech */
1563 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1564         .name             = "gssapi_krb5_sasl",
1565         .sasl_name        = "GSSAPI",
1566         .client_start     = gensec_gssapi_sasl_client_start,
1567         .server_start     = gensec_gssapi_sasl_server_start,
1568         .update           = gensec_gssapi_update,
1569         .session_key      = gensec_gssapi_session_key,
1570         .session_info     = gensec_gssapi_session_info,
1571         .max_input_size   = gensec_gssapi_max_input_size,
1572         .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1573         .wrap             = gensec_gssapi_wrap,
1574         .unwrap           = gensec_gssapi_unwrap,
1575         .have_feature     = gensec_gssapi_have_feature,
1576         .expire_time      = gensec_gssapi_expire_time,
1577         .enabled          = true,
1578         .kerberos         = true,
1579         .priority         = GENSEC_GSSAPI
1580 };
1581
1582 _PUBLIC_ NTSTATUS gensec_gssapi_init(void)
1583 {
1584         NTSTATUS ret;
1585
1586         ret = gensec_register(&gensec_gssapi_spnego_security_ops);
1587         if (!NT_STATUS_IS_OK(ret)) {
1588                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1589                         gensec_gssapi_spnego_security_ops.name));
1590                 return ret;
1591         }
1592
1593         ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1594         if (!NT_STATUS_IS_OK(ret)) {
1595                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1596                         gensec_gssapi_krb5_security_ops.name));
1597                 return ret;
1598         }
1599
1600         ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1601         if (!NT_STATUS_IS_OK(ret)) {
1602                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1603                         gensec_gssapi_sasl_krb5_security_ops.name));
1604                 return ret;
1605         }
1606
1607         return ret;
1608 }