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 <tevent.h>
  26 #include "lib/util/tevent_ntstatus.h"
  27 #include "lib/events/events.h"
  28 #include "system/kerberos.h"
  29 #include "system/gssapi.h"
  30 #include "auth/kerberos/kerberos.h"
  31 #include "librpc/gen_ndr/krb5pac.h"
  32 #include "auth/auth.h"
  33 #include <ldb.h>
  34 #include "auth/auth_sam.h"
  35 #include "librpc/gen_ndr/dcerpc.h"
  36 #include "auth/credentials/credentials.h"
  37 #include "auth/credentials/credentials_krb5.h"
  38 #include "auth/gensec/gensec.h"
  39 #include "auth/gensec/gensec_internal.h"
  40 #include "auth/gensec/gensec_proto.h"
  41 #include "auth/gensec/gensec_toplevel_proto.h"
  42 #include "param/param.h"
  43 #include "auth/session_proto.h"
  44 #include "gensec_gssapi.h"
  45 #include "lib/util/util_net.h"
  46 #include "auth/kerberos/pac_utils.h"
  47 #include "auth/kerberos/gssapi_helper.h"
  48 #include "lib/util/smb_strtox.h"
  49
  50 #ifndef gss_mech_spnego
  51 gss_OID_desc spnego_mech_oid_desc =
  52                 { 6, discard_const_p(void, "\x2b\x06\x01\x05\x05\x02") };
  53 #define gss_mech_spnego (&spnego_mech_oid_desc)
  54 #endif
  55
  56 _PUBLIC_ NTSTATUS gensec_gssapi_init(TALLOC_CTX *);
  57
  58 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security);
  59 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security);
  60 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size);
  61
  62 static int gensec_gssapi_destructor(struct gensec_gssapi_state *gensec_gssapi_state)
  63 {
  64         OM_uint32 min_stat;
  65
  66         if (gensec_gssapi_state->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
  67                 gss_release_cred(&min_stat,
  68                                  &gensec_gssapi_state->delegated_cred_handle);
  69         }
  70
  71         if (gensec_gssapi_state->gssapi_context != GSS_C_NO_CONTEXT) {
  72                 gss_delete_sec_context(&min_stat,
  73                                        &gensec_gssapi_state->gssapi_context,
  74                                        GSS_C_NO_BUFFER);
  75         }
  76
  77         if (gensec_gssapi_state->server_name != GSS_C_NO_NAME) {
  78                 gss_release_name(&min_stat,
  79                                  &gensec_gssapi_state->server_name);
  80         }
  81         if (gensec_gssapi_state->client_name != GSS_C_NO_NAME) {
  82                 gss_release_name(&min_stat,
  83                                  &gensec_gssapi_state->client_name);
  84         }
  85
  86         return 0;
  87 }
  88
  89 static NTSTATUS gensec_gssapi_setup_server_principal(TALLOC_CTX *mem_ctx,
  90                                                      const char *target_principal,
  91                                                      const char *service,
  92                                                      const char *hostname,
  93                                                      const char *realm,
  94                                                      const gss_OID mech,
  95                                                      char **pserver_principal,
  96                                                      gss_name_t *pserver_name)
  97 {
  98         char *server_principal = NULL;
  99         gss_buffer_desc name_token;
 100         gss_OID name_type;
 101         OM_uint32 maj_stat, min_stat = 0;
 102
 103         if (target_principal != NULL) {
 104                 server_principal = talloc_strdup(mem_ctx, target_principal);
 105                 name_type = GSS_C_NULL_OID;
 106         } else {
 107                 server_principal = talloc_asprintf(mem_ctx,
 108                                                    "%s/%s@%s",
 109                                                    service, hostname, realm);
 110                 name_type = GSS_C_NT_USER_NAME;
 111         }
 112         if (server_principal == NULL) {
 113                 return NT_STATUS_NO_MEMORY;
 114         }
 115
 116         name_token.value = (uint8_t *)server_principal;
 117         name_token.length = strlen(server_principal);
 118
 119         maj_stat = gss_import_name(&min_stat,
 120                                    &name_token,
 121                                    name_type,
 122                                    pserver_name);
 123         if (maj_stat) {
 124                 DBG_WARNING("GSS Import name of %s failed: %s\n",
 125                             server_principal,
 126                             gssapi_error_string(mem_ctx,
 127                                                 maj_stat,
 128                                                 min_stat,
 129                                                 mech));
 130                 TALLOC_FREE(server_principal);
 131                 return NT_STATUS_INVALID_PARAMETER;
 132         }
 133
 134         *pserver_principal = server_principal;
 135
 136         return NT_STATUS_OK;
 137 }
 138
 139 static NTSTATUS gensec_gssapi_start(struct gensec_security *gensec_security)
 140 {
 141         struct gensec_gssapi_state *gensec_gssapi_state;
 142         krb5_error_code ret;
 143 #ifdef SAMBA4_USES_HEIMDAL
 144         const char *realm;
 145 #endif
 146
 147         gensec_gssapi_state = talloc_zero(gensec_security, struct gensec_gssapi_state);
 148         if (!gensec_gssapi_state) {
 149                 return NT_STATUS_NO_MEMORY;
 150         }
 151
 152         gensec_security->private_data = gensec_gssapi_state;
 153
 154         gensec_gssapi_state->gssapi_context = GSS_C_NO_CONTEXT;
 155
 156         /* TODO: Fill in channel bindings */
 157         gensec_gssapi_state->input_chan_bindings = GSS_C_NO_CHANNEL_BINDINGS;
 158
 159         gensec_gssapi_state->server_name = GSS_C_NO_NAME;
 160         gensec_gssapi_state->client_name = GSS_C_NO_NAME;
 161
 162         gensec_gssapi_state->gss_want_flags = 0;
 163         gensec_gssapi_state->expire_time = GENSEC_EXPIRE_TIME_INFINITY;
 164
 165         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation_by_kdc_policy", true)) {
 166                 gensec_gssapi_state->gss_want_flags |= GSS_C_DELEG_POLICY_FLAG;
 167         }
 168         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "mutual", true)) {
 169                 gensec_gssapi_state->gss_want_flags |= GSS_C_MUTUAL_FLAG;
 170         }
 171         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation", false)) {
 172                 gensec_gssapi_state->gss_want_flags |= GSS_C_DELEG_FLAG;
 173         }
 174         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "replay", true)) {
 175                 gensec_gssapi_state->gss_want_flags |= GSS_C_REPLAY_FLAG;
 176         }
 177         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "sequence", true)) {
 178                 gensec_gssapi_state->gss_want_flags |= GSS_C_SEQUENCE_FLAG;
 179         }
 180
 181         if (gensec_security->want_features & GENSEC_FEATURE_SESSION_KEY) {
 182                 gensec_gssapi_state->gss_want_flags |= GSS_C_INTEG_FLAG;
 183         }
 184         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 185                 gensec_gssapi_state->gss_want_flags |= GSS_C_INTEG_FLAG;
 186         }
 187         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 188                 gensec_gssapi_state->gss_want_flags |= GSS_C_INTEG_FLAG;
 189                 gensec_gssapi_state->gss_want_flags |= GSS_C_CONF_FLAG;
 190         }
 191         if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
 192                 gensec_gssapi_state->gss_want_flags |= GSS_C_DCE_STYLE;
 193         }
 194
 195         gensec_gssapi_state->gss_got_flags = 0;
 196
 197         switch (gensec_security->ops->auth_type) {
 198         case DCERPC_AUTH_TYPE_SPNEGO:
 199                 gensec_gssapi_state->gss_oid = gss_mech_spnego;
 200                 break;
 201         case DCERPC_AUTH_TYPE_KRB5:
 202         default:
 203                 gensec_gssapi_state->gss_oid =
 204                         discard_const_p(void, gss_mech_krb5);
 205                 break;
 206         }
 207
 208         ret = smb_krb5_init_context(gensec_gssapi_state,
 209                                     gensec_security->settings->lp_ctx,
 210                                     &gensec_gssapi_state->smb_krb5_context);
 211         if (ret) {
 212                 DEBUG(1,("gensec_gssapi_start: smb_krb5_init_context failed (%s)\n",
 213                          error_message(ret)));
 214                 talloc_free(gensec_gssapi_state);
 215                 return NT_STATUS_INTERNAL_ERROR;
 216         }
 217
 218         gensec_gssapi_state->client_cred = NULL;
 219         gensec_gssapi_state->server_cred = NULL;
 220
 221         gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
 222
 223         gensec_gssapi_state->sasl = false;
 224         gensec_gssapi_state->sasl_state = STAGE_GSS_NEG;
 225         gensec_gssapi_state->sasl_protection = 0;
 226
 227         gensec_gssapi_state->max_wrap_buf_size
 228                 = gensec_setting_int(gensec_security->settings, "gensec_gssapi", "max wrap buf size", 65536);
 229         gensec_gssapi_state->gss_exchange_count = 0;
 230         gensec_gssapi_state->sig_size = 0;
 231
 232         talloc_set_destructor(gensec_gssapi_state, gensec_gssapi_destructor);
 233
 234 #ifdef SAMBA4_USES_HEIMDAL
 235         realm = lpcfg_realm(gensec_security->settings->lp_ctx);
 236         if (realm != NULL) {
 237                 ret = gsskrb5_set_default_realm(realm);
 238                 if (ret) {
 239                         DEBUG(1,("gensec_gssapi_start: gsskrb5_set_default_realm failed\n"));
 240                         talloc_free(gensec_gssapi_state);
 241                         return NT_STATUS_INTERNAL_ERROR;
 242                 }
 243         }
 244
 245         /* don't do DNS lookups of any kind, it might/will fail for a netbios name */
 246         ret = gsskrb5_set_dns_canonicalize(false);
 247         if (ret) {
 248                 DEBUG(1,("gensec_gssapi_start: gsskrb5_set_dns_canonicalize failed\n"));
 249                 talloc_free(gensec_gssapi_state);
 250                 return NT_STATUS_INTERNAL_ERROR;
 251         }
 252 #endif
 253         return NT_STATUS_OK;
 254 }
 255
 256 static NTSTATUS gensec_gssapi_server_start(struct gensec_security *gensec_security)
 257 {
 258         NTSTATUS nt_status;
 259         int ret;
 260         struct gensec_gssapi_state *gensec_gssapi_state;
 261         struct cli_credentials *machine_account;
 262         struct gssapi_creds_container *gcc;
 263
 264         nt_status = gensec_gssapi_start(gensec_security);
 265         if (!NT_STATUS_IS_OK(nt_status)) {
 266                 return nt_status;
 267         }
 268
 269         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 270
 271         machine_account = gensec_get_credentials(gensec_security);
 272
 273         if (!machine_account) {
 274                 DEBUG(3, ("No machine account credentials specified\n"));
 275                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 276         } else {
 277                 ret = cli_credentials_get_server_gss_creds(machine_account,
 278                                                            gensec_security->settings->lp_ctx, &gcc);
 279                 if (ret) {
 280                         DEBUG(1, ("Acquiring acceptor credentials failed: %s\n",
 281                                   error_message(ret)));
 282                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 283                 }
 284         }
 285
 286         gensec_gssapi_state->server_cred = gcc;
 287         return NT_STATUS_OK;
 288
 289 }
 290
 291 static NTSTATUS gensec_gssapi_sasl_server_start(struct gensec_security *gensec_security)
 292 {
 293         NTSTATUS nt_status;
 294         struct gensec_gssapi_state *gensec_gssapi_state;
 295         nt_status = gensec_gssapi_server_start(gensec_security);
 296
 297         if (NT_STATUS_IS_OK(nt_status)) {
 298                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 299                 gensec_gssapi_state->sasl = true;
 300         }
 301         return nt_status;
 302 }
 303
 304 static NTSTATUS gensec_gssapi_client_creds(struct gensec_security *gensec_security,
 305                                            struct tevent_context *ev)
 306 {
 307         struct gensec_gssapi_state *gensec_gssapi_state;
 308         struct gssapi_creds_container *gcc;
 309         struct cli_credentials *creds = gensec_get_credentials(gensec_security);
 310         const char *error_string;
 311         int ret;
 312
 313         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 314
 315         /* Only run this the first time the update() call is made */
 316         if (gensec_gssapi_state->client_cred) {
 317                 return NT_STATUS_OK;
 318         }
 319
 320         ret = cli_credentials_get_client_gss_creds(creds,
 321                                                    ev,
 322                                                    gensec_security->settings->lp_ctx, &gcc, &error_string);
 323         switch (ret) {
 324         case 0:
 325                 break;
 326         case EINVAL:
 327                 DEBUG(3, ("Cannot obtain client GSS credentials we need to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
 328                 return NT_STATUS_INVALID_PARAMETER;
 329         case KRB5KDC_ERR_PREAUTH_FAILED:
 330         case KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN:
 331         case KRB5KRB_AP_ERR_BAD_INTEGRITY:
 332                 DEBUG(1, ("Wrong username or password: %s\n", error_string));
 333                 return NT_STATUS_LOGON_FAILURE;
 334         case KRB5KDC_ERR_CLIENT_REVOKED:
 335                 DEBUG(1, ("Account locked out: %s\n", error_string));
 336                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 337         case KRB5_REALM_UNKNOWN:
 338         case KRB5_KDC_UNREACH:
 339                 DEBUG(3, ("Cannot reach a KDC we require to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
 340                 return NT_STATUS_NO_LOGON_SERVERS;
 341         case KRB5_CC_NOTFOUND:
 342         case KRB5_CC_END:
 343                 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));
 344                 return NT_STATUS_TIME_DIFFERENCE_AT_DC;
 345         default:
 346                 DEBUG(1, ("Aquiring initiator credentials failed: %s\n", error_string));
 347                 return NT_STATUS_UNSUCCESSFUL;
 348         }
 349
 350         gensec_gssapi_state->client_cred = gcc;
 351         if (!talloc_reference(gensec_gssapi_state, gcc)) {
 352                 return NT_STATUS_NO_MEMORY;
 353         }
 354
 355         return NT_STATUS_OK;
 356 }
 357
 358 static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_security)
 359 {
 360         struct gensec_gssapi_state *gensec_gssapi_state;
 361         struct cli_credentials *creds = gensec_get_credentials(gensec_security);
 362         NTSTATUS nt_status;
 363         const char *target_principal = NULL;
 364         const char *hostname = gensec_get_target_hostname(gensec_security);
 365         const char *service = gensec_get_target_service(gensec_security);
 366         const char *realm = cli_credentials_get_realm(creds);
 367
 368         target_principal = gensec_get_target_principal(gensec_security);
 369         if (target_principal != NULL) {
 370                 goto do_start;
 371         }
 372
 373         if (!hostname) {
 374                 DEBUG(3, ("No hostname for target computer passed in, cannot use kerberos for this connection\n"));
 375                 return NT_STATUS_INVALID_PARAMETER;
 376         }
 377         if (is_ipaddress(hostname)) {
 378                 DEBUG(2, ("Cannot do GSSAPI to an IP address\n"));
 379                 return NT_STATUS_INVALID_PARAMETER;
 380         }
 381         if (strcmp(hostname, "localhost") == 0) {
 382                 DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
 383                 return NT_STATUS_INVALID_PARAMETER;
 384         }
 385
 386         if (realm == NULL) {
 387                 char *cred_name = cli_credentials_get_unparsed_name(creds,
 388                                                                 gensec_security);
 389                 DEBUG(3, ("cli_credentials(%s) without realm, "
 390                           "cannot use kerberos for this connection %s/%s\n",
 391                           cred_name, service, hostname));
 392                 TALLOC_FREE(cred_name);
 393                 return NT_STATUS_INVALID_PARAMETER;
 394         }
 395
 396 do_start:
 397
 398         nt_status = gensec_gssapi_start(gensec_security);
 399         if (!NT_STATUS_IS_OK(nt_status)) {
 400                 return nt_status;
 401         }
 402
 403         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 404
 405         if (cli_credentials_get_impersonate_principal(creds)) {
 406                 gensec_gssapi_state->gss_want_flags &= ~(GSS_C_DELEG_FLAG|GSS_C_DELEG_POLICY_FLAG);
 407         }
 408
 409         return NT_STATUS_OK;
 410 }
 411
 412 static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
 413 {
 414         NTSTATUS nt_status;
 415         struct gensec_gssapi_state *gensec_gssapi_state;
 416         nt_status = gensec_gssapi_client_start(gensec_security);
 417
 418         if (NT_STATUS_IS_OK(nt_status)) {
 419                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 420                 gensec_gssapi_state->sasl = true;
 421         }
 422         return nt_status;
 423 }
 424
 425 static NTSTATUS gensec_gssapi_update_internal(struct gensec_security *gensec_security,
 426                                               TALLOC_CTX *out_mem_ctx,
 427                                               struct tevent_context *ev,
 428                                               const DATA_BLOB in, DATA_BLOB *out)
 429 {
 430         struct gensec_gssapi_state *gensec_gssapi_state
 431                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 432         NTSTATUS nt_status;
 433         OM_uint32 maj_stat, min_stat;
 434         OM_uint32 min_stat2;
 435         gss_buffer_desc input_token = { 0, NULL };
 436         gss_buffer_desc output_token = { 0, NULL };
 437         struct cli_credentials *cli_creds = gensec_get_credentials(gensec_security);
 438         const char *target_principal = gensec_get_target_principal(gensec_security);
 439         const char *hostname = gensec_get_target_hostname(gensec_security);
 440         const char *service = gensec_get_target_service(gensec_security);
 441         gss_OID gss_oid_p = NULL;
 442         OM_uint32 time_req = 0;
 443         OM_uint32 time_rec = 0;
 444         struct timeval tv;
 445
 446         time_req = gensec_setting_int(gensec_security->settings,
 447                                       "gensec_gssapi", "requested_life_time",
 448                                       time_req);
 449
 450         input_token.length = in.length;
 451         input_token.value = in.data;
 452
 453         switch (gensec_gssapi_state->sasl_state) {
 454         case STAGE_GSS_NEG:
 455         {
 456                 switch (gensec_security->gensec_role) {
 457                 case GENSEC_CLIENT:
 458                 {
 459                         const char *client_realm = NULL;
 460 #ifdef SAMBA4_USES_HEIMDAL
 461                         struct gsskrb5_send_to_kdc send_to_kdc;
 462                         krb5_error_code ret;
 463 #else
 464                         bool fallback = false;
 465 #endif
 466
 467                         nt_status = gensec_gssapi_client_creds(gensec_security, ev);
 468                         if (!NT_STATUS_IS_OK(nt_status)) {
 469                                 return nt_status;
 470                         }
 471
 472 #ifdef SAMBA4_USES_HEIMDAL
 473                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 474                         send_to_kdc.ptr = ev;
 475
 476                         min_stat = gsskrb5_set_send_to_kdc(&send_to_kdc);
 477                         if (min_stat) {
 478                                 DEBUG(1,("gensec_gssapi_update: gsskrb5_set_send_to_kdc failed\n"));
 479                                 return NT_STATUS_INTERNAL_ERROR;
 480                         }
 481 #endif
 482
 483                         /*
 484                          * With credentials for
 485                          * administrator@FOREST1.EXAMPLE.COM this patch changes
 486                          * the target_principal for the ldap service of host
 487                          * dc2.forest2.example.com from
 488                          *
 489                          *   ldap/dc2.forest2.example.com@FOREST1.EXAMPLE.COM
 490                          *
 491                          * to
 492                          *
 493                          *   ldap/dc2.forest2.example.com@FOREST2.EXAMPLE.COM
 494                          *
 495                          * Typically
 496                          * ldap/dc2.forest2.example.com@FOREST1.EXAMPLE.COM
 497                          * should be used in order to allow the KDC of
 498                          * FOREST1.EXAMPLE.COM to generate a referral ticket
 499                          * for krbtgt/FOREST2.EXAMPLE.COM@FOREST1.EXAMPLE.COM.
 500                          *
 501                          * The problem is that KDCs only return such referral
 502                          * tickets if there's a forest trust between
 503                          * FOREST1.EXAMPLE.COM and FOREST2.EXAMPLE.COM. If
 504                          * there's only an external domain trust between
 505                          * FOREST1.EXAMPLE.COM and FOREST2.EXAMPLE.COM the KDC
 506                          * of FOREST1.EXAMPLE.COM will respond with
 507                          * S_PRINCIPAL_UNKNOWN when being asked for
 508                          * ldap/dc2.forest2.example.com@FOREST1.EXAMPLE.COM.
 509                          *
 510                          * In the case of an external trust the client can
 511                          * still ask explicitly for
 512                          * krbtgt/FOREST2.EXAMPLE.COM@FOREST1.EXAMPLE.COM and
 513                          * the KDC of FOREST1.EXAMPLE.COM will generate it.
 514                          *
 515                          * From there the client can use the
 516                          * krbtgt/FOREST2.EXAMPLE.COM@FOREST1.EXAMPLE.COM
 517                          * ticket and ask a KDC of FOREST2.EXAMPLE.COM for a
 518                          * service ticket for
 519                          * ldap/dc2.forest2.example.com@FOREST2.EXAMPLE.COM.
 520                          *
 521                          * With Heimdal we'll get the fallback on
 522                          * S_PRINCIPAL_UNKNOWN behavior when we pass
 523                          * ldap/dc2.forest2.example.com@FOREST2.EXAMPLE.COM as
 524                          * target principal. As _krb5_get_cred_kdc_any() first
 525                          * calls get_cred_kdc_referral() (which always starts
 526                          * with the client realm) and falls back to
 527                          * get_cred_kdc_capath() (which starts with the given
 528                          * realm).
 529                          *
 530                          * MIT krb5 only tries the given realm of the target
 531                          * principal, if we want to autodetect support for
 532                          * transitive forest trusts, would have to do the
 533                          * fallback ourself.
 534                          */
 535                         client_realm = cli_credentials_get_realm(cli_creds);
 536 #ifndef SAMBA4_USES_HEIMDAL
 537                         if (gensec_gssapi_state->server_name == NULL) {
 538                                 nt_status = gensec_gssapi_setup_server_principal(gensec_gssapi_state,
 539                                                                                  target_principal,
 540                                                                                  service,
 541                                                                                  hostname,
 542                                                                                  client_realm,
 543                                                                                  gensec_gssapi_state->gss_oid,
 544                                                                                  &gensec_gssapi_state->target_principal,
 545                                                                                  &gensec_gssapi_state->server_name);
 546                                 if (!NT_STATUS_IS_OK(nt_status)) {
 547                                         return nt_status;
 548                                 }
 549
 550                                 maj_stat = gss_init_sec_context(&min_stat,
 551                                                                 gensec_gssapi_state->client_cred->creds,
 552                                                                 &gensec_gssapi_state->gssapi_context,
 553                                                                 gensec_gssapi_state->server_name,
 554                                                                 gensec_gssapi_state->gss_oid,
 555                                                                 gensec_gssapi_state->gss_want_flags,
 556                                                                 time_req,
 557                                                                 gensec_gssapi_state->input_chan_bindings,
 558                                                                 &input_token,
 559                                                                 &gss_oid_p,
 560                                                                 &output_token,
 561                                                                 &gensec_gssapi_state->gss_got_flags, /* ret flags */
 562                                                                 &time_rec);
 563                                 if (maj_stat != GSS_S_FAILURE) {
 564                                         goto init_sec_context_done;
 565                                 }
 566                                 if (min_stat != (OM_uint32)KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN) {
 567                                         goto init_sec_context_done;
 568                                 }
 569                                 if (target_principal != NULL) {
 570                                         goto init_sec_context_done;
 571                                 }
 572
 573                                 fallback = true;
 574                                 TALLOC_FREE(gensec_gssapi_state->target_principal);
 575                                 gss_release_name(&min_stat2, &gensec_gssapi_state->server_name);
 576                         }
 577 #endif /* !SAMBA4_USES_HEIMDAL */
 578                         if (gensec_gssapi_state->server_name == NULL) {
 579                                 const char *server_realm = NULL;
 580
 581                                 server_realm = smb_krb5_get_realm_from_hostname(gensec_gssapi_state,
 582                                                                                 hostname,
 583                                                                                 client_realm);
 584                                 if (server_realm == NULL) {
 585                                         return NT_STATUS_NO_MEMORY;
 586                                 }
 587
 588 #ifndef SAMBA4_USES_HEIMDAL
 589                                 if (fallback &&
 590                                     strequal(client_realm, server_realm)) {
 591                                         goto init_sec_context_done;
 592                                 }
 593 #endif /* !SAMBA4_USES_HEIMDAL */
 594
 595                                 nt_status = gensec_gssapi_setup_server_principal(gensec_gssapi_state,
 596                                                                                  target_principal,
 597                                                                                  service,
 598                                                                                  hostname,
 599                                                                                  server_realm,
 600                                                                                  gensec_gssapi_state->gss_oid,
 601                                                                                  &gensec_gssapi_state->target_principal,
 602                                                                                  &gensec_gssapi_state->server_name);
 603                                 if (!NT_STATUS_IS_OK(nt_status)) {
 604                                         return nt_status;
 605                                 }
 606                         }
 607
 608                         maj_stat = gss_init_sec_context(&min_stat,
 609                                                         gensec_gssapi_state->client_cred->creds,
 610                                                         &gensec_gssapi_state->gssapi_context,
 611                                                         gensec_gssapi_state->server_name,
 612                                                         gensec_gssapi_state->gss_oid,
 613                                                         gensec_gssapi_state->gss_want_flags,
 614                                                         time_req,
 615                                                         gensec_gssapi_state->input_chan_bindings,
 616                                                         &input_token,
 617                                                         &gss_oid_p,
 618                                                         &output_token,
 619                                                         &gensec_gssapi_state->gss_got_flags, /* ret flags */
 620                                                         &time_rec);
 621                         goto init_sec_context_done;
 622                         /* JUMP! */
 623 init_sec_context_done:
 624                         if (gss_oid_p) {
 625                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 626                         }
 627
 628 #ifdef SAMBA4_USES_HEIMDAL
 629                         send_to_kdc.func = smb_krb5_send_and_recv_func;
 630                         send_to_kdc.ptr = NULL;
 631
 632                         ret = gsskrb5_set_send_to_kdc(&send_to_kdc);
 633                         if (ret) {
 634                                 DEBUG(1,("gensec_gssapi_update: gsskrb5_set_send_to_kdc failed\n"));
 635                                 return NT_STATUS_INTERNAL_ERROR;
 636                         }
 637 #endif
 638                         break;
 639                 }
 640                 case GENSEC_SERVER:
 641                 {
 642                         maj_stat = gss_accept_sec_context(&min_stat,
 643                                                           &gensec_gssapi_state->gssapi_context,
 644                                                           gensec_gssapi_state->server_cred->creds,
 645                                                           &input_token,
 646                                                           gensec_gssapi_state->input_chan_bindings,
 647                                                           &gensec_gssapi_state->client_name,
 648                                                           &gss_oid_p,
 649                                                           &output_token,
 650                                                           &gensec_gssapi_state->gss_got_flags,
 651                                                           &time_rec,
 652                                                           &gensec_gssapi_state->delegated_cred_handle);
 653                         if (gss_oid_p) {
 654                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 655                         }
 656                         break;
 657                 }
 658                 default:
 659                         return NT_STATUS_INVALID_PARAMETER;
 660
 661                 }
 662
 663                 gensec_gssapi_state->gss_exchange_count++;
 664
 665                 if (maj_stat == GSS_S_COMPLETE) {
 666                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 667                         gss_release_buffer(&min_stat2, &output_token);
 668
 669                         if (gensec_gssapi_state->gss_got_flags & GSS_C_DELEG_FLAG &&
 670                             gensec_gssapi_state->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
 671                                 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
 672                         } else {
 673                                 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
 674                         }
 675
 676                         tv = timeval_current_ofs(time_rec, 0);
 677                         gensec_gssapi_state->expire_time = timeval_to_nttime(&tv);
 678
 679                         /* We may have been invoked as SASL, so there
 680                          * is more work to do */
 681                         if (gensec_gssapi_state->sasl) {
 682                                 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
 683                                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 684                         } else {
 685                                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 686
 687                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 688                                         DEBUG(5, ("GSSAPI Connection will be cryptographically sealed\n"));
 689                                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 690                                         DEBUG(5, ("GSSAPI Connection will be cryptographically signed\n"));
 691                                 } else {
 692                                         DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
 693                                 }
 694
 695                                 return NT_STATUS_OK;
 696                         }
 697                 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
 698                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 699                         gss_release_buffer(&min_stat2, &output_token);
 700
 701                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 702                 } else if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
 703                         gss_cred_id_t creds = NULL;
 704                         gss_name_t name;
 705                         gss_buffer_desc buffer;
 706                         OM_uint32 lifetime = 0;
 707                         gss_cred_usage_t usage;
 708                         const char *role = NULL;
 709
 710                         switch (gensec_security->gensec_role) {
 711                         case GENSEC_CLIENT:
 712                                 creds = gensec_gssapi_state->client_cred->creds;
 713                                 role = "client";
 714                                 break;
 715                         case GENSEC_SERVER:
 716                                 creds = gensec_gssapi_state->server_cred->creds;
 717                                 role = "server";
 718                                 break;
 719                         }
 720
 721                         DBG_ERR("GSS %s Update(krb5)(%d) failed, credentials "
 722                                 "expired during GSSAPI handshake!\n",
 723                                 role,
 724                                 gensec_gssapi_state->gss_exchange_count);
 725
 726                         maj_stat = gss_inquire_cred(&min_stat,
 727                                                     creds,
 728                                                     &name, &lifetime, &usage, NULL);
 729
 730                         if (maj_stat == GSS_S_COMPLETE) {
 731                                 const char *usage_string = NULL;
 732                                 switch (usage) {
 733                                 case GSS_C_BOTH:
 734                                         usage_string = "GSS_C_BOTH";
 735                                         break;
 736                                 case GSS_C_ACCEPT:
 737                                         usage_string = "GSS_C_ACCEPT";
 738                                         break;
 739                                 case GSS_C_INITIATE:
 740                                         usage_string = "GSS_C_INITIATE";
 741                                         break;
 742                                 }
 743                                 maj_stat = gss_display_name(&min_stat, name, &buffer, NULL);
 744                                 if (maj_stat) {
 745                                         buffer.value = NULL;
 746                                         buffer.length = 0;
 747                                 }
 748                                 if (lifetime > 0) {
 749                                         DEBUG(0, ("GSSAPI gss_inquire_cred indicates expiry of %*.*s in %u sec for %s\n",
 750                                                   (int)buffer.length, (int)buffer.length, (char *)buffer.value,
 751                                                   lifetime, usage_string));
 752                                 } else {
 753                                         DEBUG(0, ("GSSAPI gss_inquire_cred indicates %*.*s has already expired for %s\n",
 754                                                   (int)buffer.length, (int)buffer.length, (char *)buffer.value,
 755                                                   usage_string));
 756                                 }
 757                                 gss_release_buffer(&min_stat, &buffer);
 758                                 gss_release_name(&min_stat, &name);
 759                         } else if (maj_stat != GSS_S_COMPLETE) {
 760                                 DEBUG(0, ("inquiry of credential lifefime via GSSAPI gss_inquire_cred failed: %s\n",
 761                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 762                         }
 763                         return NT_STATUS_INVALID_PARAMETER;
 764                 } else if (smb_gss_oid_equal(gensec_gssapi_state->gss_oid,
 765                                              gss_mech_krb5)) {
 766                         switch (min_stat) {
 767                         case (OM_uint32)KRB5KRB_AP_ERR_TKT_NYV:
 768                                 DEBUG(1, ("Error with ticket to contact %s: possible clock skew between us and the KDC or target server: %s\n",
 769                                           gensec_gssapi_state->target_principal,
 770                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 771                                 return NT_STATUS_TIME_DIFFERENCE_AT_DC; /* Make SPNEGO ignore us, we can't go any further here */
 772                         case (OM_uint32)KRB5KRB_AP_ERR_TKT_EXPIRED:
 773                                 DEBUG(1, ("Error with ticket to contact %s: ticket is expired, possible clock skew between us and the KDC or target server: %s\n",
 774                                           gensec_gssapi_state->target_principal,
 775                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 776                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 777                         case (OM_uint32)KRB5_KDC_UNREACH:
 778                                 DEBUG(3, ("Cannot reach a KDC we require in order to obtain a ticket to %s: %s\n",
 779                                           gensec_gssapi_state->target_principal,
 780                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 781                                 return NT_STATUS_NO_LOGON_SERVERS; /* Make SPNEGO ignore us, we can't go any further here */
 782                         case (OM_uint32)KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 783                                 DEBUG(3, ("Server %s is not registered with our KDC: %s\n",
 784                                           gensec_gssapi_state->target_principal,
 785                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 786                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 787                         case (OM_uint32)KRB5KRB_AP_ERR_MSG_TYPE:
 788                                 /* garbage input, possibly from the auto-mech detection */
 789                                 return NT_STATUS_INVALID_PARAMETER;
 790                         default:
 791                                 DEBUG(1, ("GSS %s Update(krb5)(%d) Update failed: %s\n",
 792                                           gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 793                                           gensec_gssapi_state->gss_exchange_count,
 794                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 795                                 return NT_STATUS_LOGON_FAILURE;
 796                         }
 797                 } else {
 798                         DEBUG(1, ("GSS %s Update(%d) failed: %s\n",
 799                                   gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
 800                                   gensec_gssapi_state->gss_exchange_count,
 801                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 802                         return NT_STATUS_LOGON_FAILURE;
 803                 }
 804                 break;
 805         }
 806
 807         /* These last two stages are only done if we were invoked as SASL */
 808         case STAGE_SASL_SSF_NEG:
 809         {
 810                 switch (gensec_security->gensec_role) {
 811                 case GENSEC_CLIENT:
 812                 {
 813                         uint8_t maxlength_proposed[4];
 814                         uint8_t maxlength_accepted[4];
 815                         uint8_t security_supported;
 816                         int conf_state;
 817                         gss_qop_t qop_state;
 818                         input_token.length = in.length;
 819                         input_token.value = in.data;
 820
 821                         /* As a client, we have just send a
 822                          * zero-length blob to the server (after the
 823                          * normal GSSAPI exchange), and it has replied
 824                          * with it's SASL negotiation */
 825
 826                         maj_stat = gss_unwrap(&min_stat,
 827                                               gensec_gssapi_state->gssapi_context,
 828                                               &input_token,
 829                                               &output_token,
 830                                               &conf_state,
 831                                               &qop_state);
 832                         if (GSS_ERROR(maj_stat)) {
 833                                 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 834                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 835                                 return NT_STATUS_ACCESS_DENIED;
 836                         }
 837
 838                         if (output_token.length < 4) {
 839                                 gss_release_buffer(&min_stat, &output_token);
 840                                 return NT_STATUS_INVALID_PARAMETER;
 841                         }
 842
 843                         memcpy(maxlength_proposed, output_token.value, 4);
 844                         gss_release_buffer(&min_stat, &output_token);
 845
 846                         /* first byte is the proposed security */
 847                         security_supported = maxlength_proposed[0];
 848                         maxlength_proposed[0] = '\0';
 849
 850                         /* Rest is the proposed max wrap length */
 851                         gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
 852                                                                      gensec_gssapi_state->max_wrap_buf_size);
 853                         gensec_gssapi_state->sasl_protection = 0;
 854                         if (security_supported & NEG_SEAL) {
 855                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 856                                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 857                                 }
 858                         }
 859                         if (security_supported & NEG_SIGN) {
 860                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 861                                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 862                                 }
 863                         }
 864                         if (security_supported & NEG_NONE) {
 865                                 gensec_gssapi_state->sasl_protection |= NEG_NONE;
 866                         }
 867                         if (gensec_gssapi_state->sasl_protection == 0) {
 868                                 DEBUG(1, ("Remote server does not support unprotected connections\n"));
 869                                 return NT_STATUS_ACCESS_DENIED;
 870                         }
 871
 872                         /* Send back the negotiated max length */
 873
 874                         RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
 875
 876                         maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
 877
 878                         input_token.value = maxlength_accepted;
 879                         input_token.length = sizeof(maxlength_accepted);
 880
 881                         maj_stat = gss_wrap(&min_stat,
 882                                             gensec_gssapi_state->gssapi_context,
 883                                             false,
 884                                             GSS_C_QOP_DEFAULT,
 885                                             &input_token,
 886                                             &conf_state,
 887                                             &output_token);
 888                         if (GSS_ERROR(maj_stat)) {
 889                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 890                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 891                                 return NT_STATUS_ACCESS_DENIED;
 892                         }
 893
 894                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 895                         gss_release_buffer(&min_stat, &output_token);
 896
 897                         /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 898                         gensec_gssapi_state->sasl_state = STAGE_DONE;
 899
 900                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 901                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically sealed\n"));
 902                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 903                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically signed\n"));
 904                         } else {
 905                                 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographically protection\n"));
 906                         }
 907
 908                         return NT_STATUS_OK;
 909                 }
 910                 case GENSEC_SERVER:
 911                 {
 912                         uint8_t maxlength_proposed[4];
 913                         uint8_t security_supported = 0x0;
 914                         int conf_state;
 915
 916                         /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
 917                         if (in.length != 0) {
 918                                 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
 919                         }
 920
 921                         /* Give the client some idea what we will support */
 922
 923                         RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
 924                         /* first byte is the proposed security */
 925                         maxlength_proposed[0] = '\0';
 926
 927                         gensec_gssapi_state->sasl_protection = 0;
 928                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 929                                 security_supported |= NEG_SEAL;
 930                         }
 931                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 932                                 security_supported |= NEG_SIGN;
 933                         }
 934                         if (security_supported == 0) {
 935                                 /* If we don't support anything, this must be 0 */
 936                                 RSIVAL(maxlength_proposed, 0, 0x0);
 937                         }
 938
 939                         /* TODO:  We may not wish to support this */
 940                         security_supported |= NEG_NONE;
 941                         maxlength_proposed[0] = security_supported;
 942
 943                         input_token.value = maxlength_proposed;
 944                         input_token.length = sizeof(maxlength_proposed);
 945
 946                         maj_stat = gss_wrap(&min_stat,
 947                                             gensec_gssapi_state->gssapi_context,
 948                                             false,
 949                                             GSS_C_QOP_DEFAULT,
 950                                             &input_token,
 951                                             &conf_state,
 952                                             &output_token);
 953                         if (GSS_ERROR(maj_stat)) {
 954                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 955                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 956                                 return NT_STATUS_ACCESS_DENIED;
 957                         }
 958
 959                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 960                         gss_release_buffer(&min_stat, &output_token);
 961
 962                         gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
 963                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 964                 }
 965                 default:
 966                         return NT_STATUS_INVALID_PARAMETER;
 967
 968                 }
 969         }
 970         /* This is s server-only stage */
 971         case STAGE_SASL_SSF_ACCEPT:
 972         {
 973                 uint8_t maxlength_accepted[4];
 974                 uint8_t security_accepted;
 975                 int conf_state;
 976                 gss_qop_t qop_state;
 977                 input_token.length = in.length;
 978                 input_token.value = in.data;
 979
 980                 maj_stat = gss_unwrap(&min_stat,
 981                                       gensec_gssapi_state->gssapi_context,
 982                                       &input_token,
 983                                       &output_token,
 984                                       &conf_state,
 985                                       &qop_state);
 986                 if (GSS_ERROR(maj_stat)) {
 987                         DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 988                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 989                         return NT_STATUS_ACCESS_DENIED;
 990                 }
 991
 992                 if (output_token.length < 4) {
 993                         gss_release_buffer(&min_stat, &output_token);
 994                         return NT_STATUS_INVALID_PARAMETER;
 995                 }
 996
 997                 memcpy(maxlength_accepted, output_token.value, 4);
 998                 gss_release_buffer(&min_stat, &output_token);
 999
1000                 /* first byte is the proposed security */
1001                 security_accepted = maxlength_accepted[0];
1002                 maxlength_accepted[0] = '\0';
1003
1004                 /* Rest is the proposed max wrap length */
1005                 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
1006                                                              gensec_gssapi_state->max_wrap_buf_size);
1007
1008                 gensec_gssapi_state->sasl_protection = 0;
1009                 if (security_accepted & NEG_SEAL) {
1010                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
1011                                 DEBUG(1, ("Remote client wanted seal, but gensec refused\n"));
1012                                 return NT_STATUS_ACCESS_DENIED;
1013                         }
1014                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
1015                 }
1016                 if (security_accepted & NEG_SIGN) {
1017                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
1018                                 DEBUG(1, ("Remote client wanted sign, but gensec refused\n"));
1019                                 return NT_STATUS_ACCESS_DENIED;
1020                         }
1021                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
1022                 }
1023                 if (security_accepted & NEG_NONE) {
1024                         gensec_gssapi_state->sasl_protection |= NEG_NONE;
1025                 }
1026
1027                 /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
1028                 gensec_gssapi_state->sasl_state = STAGE_DONE;
1029                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
1030                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically sealed\n"));
1031                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
1032                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically signed\n"));
1033                 } else {
1034                         DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
1035                 }
1036
1037                 *out = data_blob(NULL, 0);
1038                 return NT_STATUS_OK;
1039         }
1040         default:
1041                 return NT_STATUS_INVALID_PARAMETER;
1042         }
1043 }
1044
1045 struct gensec_gssapi_update_state {
1046         NTSTATUS status;
1047         DATA_BLOB out;
1048 };
1049
1050 static struct tevent_req *gensec_gssapi_update_send(TALLOC_CTX *mem_ctx,
1051                                                     struct tevent_context *ev,
1052                                                     struct gensec_security *gensec_security,
1053                                                     const DATA_BLOB in)
1054 {
1055         struct tevent_req *req = NULL;
1056         struct gensec_gssapi_update_state *state = NULL;
1057         NTSTATUS status;
1058
1059         req = tevent_req_create(mem_ctx, &state,
1060                                 struct gensec_gssapi_update_state);
1061         if (req == NULL) {
1062                 return NULL;
1063         }
1064
1065         status = gensec_gssapi_update_internal(gensec_security,
1066                                                state, ev, in,
1067                                                &state->out);
1068         state->status = status;
1069         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
1070                 tevent_req_done(req);
1071                 return tevent_req_post(req, ev);
1072         }
1073         if (tevent_req_nterror(req, status)) {
1074                 return tevent_req_post(req, ev);
1075         }
1076
1077         tevent_req_done(req);
1078         return tevent_req_post(req, ev);
1079 }
1080
1081 static NTSTATUS gensec_gssapi_update_recv(struct tevent_req *req,
1082                                           TALLOC_CTX *out_mem_ctx,
1083                                           DATA_BLOB *out)
1084 {
1085         struct gensec_gssapi_update_state *state =
1086                 tevent_req_data(req,
1087                 struct gensec_gssapi_update_state);
1088         NTSTATUS status;
1089
1090         *out = data_blob_null;
1091
1092         if (tevent_req_is_nterror(req, &status)) {
1093                 tevent_req_received(req);
1094                 return status;
1095         }
1096
1097         *out = state->out;
1098         talloc_steal(out_mem_ctx, state->out.data);
1099         status = state->status;
1100         tevent_req_received(req);
1101         return status;
1102 }
1103
1104 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
1105                                    TALLOC_CTX *mem_ctx,
1106                                    const DATA_BLOB *in,
1107                                    DATA_BLOB *out)
1108 {
1109         struct gensec_gssapi_state *gensec_gssapi_state
1110                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1111         OM_uint32 maj_stat, min_stat;
1112         gss_buffer_desc input_token, output_token;
1113         int conf_state;
1114         input_token.length = in->length;
1115         input_token.value = in->data;
1116
1117         maj_stat = gss_wrap(&min_stat,
1118                             gensec_gssapi_state->gssapi_context,
1119                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
1120                             GSS_C_QOP_DEFAULT,
1121                             &input_token,
1122                             &conf_state,
1123                             &output_token);
1124         if (GSS_ERROR(maj_stat)) {
1125                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
1126                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1127                 return NT_STATUS_ACCESS_DENIED;
1128         }
1129
1130         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
1131         gss_release_buffer(&min_stat, &output_token);
1132
1133         if (gensec_gssapi_state->sasl) {
1134                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
1135                 if (max_wrapped_size < out->length) {
1136                         DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
1137                                   (unsigned)in->length,
1138                                   (unsigned)out->length,
1139                                   (unsigned int)max_wrapped_size));
1140                         return NT_STATUS_INVALID_PARAMETER;
1141                 }
1142         }
1143
1144         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1145             && !conf_state) {
1146                 return NT_STATUS_ACCESS_DENIED;
1147         }
1148         return NT_STATUS_OK;
1149 }
1150
1151 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
1152                                      TALLOC_CTX *mem_ctx,
1153                                      const DATA_BLOB *in,
1154                                      DATA_BLOB *out)
1155 {
1156         struct gensec_gssapi_state *gensec_gssapi_state
1157                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1158         OM_uint32 maj_stat, min_stat;
1159         gss_buffer_desc input_token, output_token;
1160         int conf_state;
1161         gss_qop_t qop_state;
1162         input_token.length = in->length;
1163         input_token.value = in->data;
1164
1165         if (gensec_gssapi_state->sasl) {
1166                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
1167                 if (max_wrapped_size < in->length) {
1168                         DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
1169                         return NT_STATUS_INVALID_PARAMETER;
1170                 }
1171         }
1172
1173         /*
1174          * FIXME: input_message_buffer is marked const, but gss_unwrap() may
1175          * modify it (see calls to rrc_rotate() in _gssapi_unwrap_cfx()).
1176          */
1177         maj_stat = gss_unwrap(&min_stat,
1178                               gensec_gssapi_state->gssapi_context,
1179                               &input_token,
1180                               &output_token,
1181                               &conf_state,
1182                               &qop_state);
1183         if (GSS_ERROR(maj_stat)) {
1184                 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
1185                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1186                 return NT_STATUS_ACCESS_DENIED;
1187         }
1188
1189         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
1190         gss_release_buffer(&min_stat, &output_token);
1191
1192         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1193             && !conf_state) {
1194                 return NT_STATUS_ACCESS_DENIED;
1195         }
1196         return NT_STATUS_OK;
1197 }
1198
1199 /* Find out the maximum input size negotiated on this connection */
1200
1201 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
1202 {
1203         struct gensec_gssapi_state *gensec_gssapi_state
1204                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1205         OM_uint32 maj_stat, min_stat;
1206         OM_uint32 max_input_size;
1207
1208         maj_stat = gss_wrap_size_limit(&min_stat,
1209                                        gensec_gssapi_state->gssapi_context,
1210                                        gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
1211                                        GSS_C_QOP_DEFAULT,
1212                                        gensec_gssapi_state->max_wrap_buf_size,
1213                                        &max_input_size);
1214         if (GSS_ERROR(maj_stat)) {
1215                 TALLOC_CTX *mem_ctx = talloc_new(NULL);
1216                 DEBUG(1, ("gensec_gssapi_max_input_size: determining signature size with gss_wrap_size_limit failed: %s\n",
1217                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1218                 talloc_free(mem_ctx);
1219                 return 0;
1220         }
1221
1222         return max_input_size;
1223 }
1224
1225 /* Find out the maximum output size negotiated on this connection */
1226 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
1227 {
1228         struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
1229         return gensec_gssapi_state->max_wrap_buf_size;
1230 }
1231
1232 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
1233                                           TALLOC_CTX *mem_ctx,
1234                                           uint8_t *data, size_t length,
1235                                           const uint8_t *whole_pdu, size_t pdu_length,
1236                                           DATA_BLOB *sig)
1237 {
1238         struct gensec_gssapi_state *gensec_gssapi_state
1239                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1240         bool hdr_signing = false;
1241         size_t sig_size = 0;
1242         NTSTATUS status;
1243
1244         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1245                 hdr_signing = true;
1246         }
1247
1248         sig_size = gensec_gssapi_sig_size(gensec_security, length);
1249
1250         status = gssapi_seal_packet(gensec_gssapi_state->gssapi_context,
1251                                     gensec_gssapi_state->gss_oid,
1252                                     hdr_signing, sig_size,
1253                                     data, length,
1254                                     whole_pdu, pdu_length,
1255                                     mem_ctx, sig);
1256         if (!NT_STATUS_IS_OK(status)) {
1257                 DEBUG(0, ("gssapi_seal_packet(hdr_signing=%u,sig_size=%zu,"
1258                           "data=%zu,pdu=%zu) failed: %s\n",
1259                           hdr_signing, sig_size, length, pdu_length,
1260                           nt_errstr(status)));
1261                 return status;
1262         }
1263
1264         return NT_STATUS_OK;
1265 }
1266
1267 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
1268                                             uint8_t *data, size_t length,
1269                                             const uint8_t *whole_pdu, size_t pdu_length,
1270                                             const DATA_BLOB *sig)
1271 {
1272         struct gensec_gssapi_state *gensec_gssapi_state
1273                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1274         bool hdr_signing = false;
1275         NTSTATUS status;
1276
1277         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1278                 hdr_signing = true;
1279         }
1280
1281         status = gssapi_unseal_packet(gensec_gssapi_state->gssapi_context,
1282                                       gensec_gssapi_state->gss_oid,
1283                                       hdr_signing,
1284                                       data, length,
1285                                       whole_pdu, pdu_length,
1286                                       sig);
1287         if (!NT_STATUS_IS_OK(status)) {
1288                 DEBUG(0, ("gssapi_unseal_packet(hdr_signing=%u,sig_size=%zu,"
1289                           "data=%zu,pdu=%zu) failed: %s\n",
1290                           hdr_signing, sig->length, length, pdu_length,
1291                           nt_errstr(status)));
1292                 return status;
1293         }
1294
1295         return NT_STATUS_OK;
1296 }
1297
1298 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1299                                           TALLOC_CTX *mem_ctx,
1300                                           const uint8_t *data, size_t length,
1301                                           const uint8_t *whole_pdu, size_t pdu_length,
1302                                           DATA_BLOB *sig)
1303 {
1304         struct gensec_gssapi_state *gensec_gssapi_state
1305                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1306         bool hdr_signing = false;
1307         NTSTATUS status;
1308
1309         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1310                 hdr_signing = true;
1311         }
1312
1313         status = gssapi_sign_packet(gensec_gssapi_state->gssapi_context,
1314                                     gensec_gssapi_state->gss_oid,
1315                                     hdr_signing,
1316                                     data, length,
1317                                     whole_pdu, pdu_length,
1318                                     mem_ctx, sig);
1319         if (!NT_STATUS_IS_OK(status)) {
1320                 DEBUG(0, ("gssapi_sign_packet(hdr_signing=%u,"
1321                           "data=%zu,pdu=%zu) failed: %s\n",
1322                           hdr_signing, length, pdu_length,
1323                           nt_errstr(status)));
1324                 return status;
1325         }
1326
1327         return NT_STATUS_OK;
1328 }
1329
1330 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1331                                            const uint8_t *data, size_t length,
1332                                            const uint8_t *whole_pdu, size_t pdu_length,
1333                                            const DATA_BLOB *sig)
1334 {
1335         struct gensec_gssapi_state *gensec_gssapi_state
1336                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1337         bool hdr_signing = false;
1338         NTSTATUS status;
1339
1340         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1341                 hdr_signing = true;
1342         }
1343
1344         status = gssapi_check_packet(gensec_gssapi_state->gssapi_context,
1345                                      gensec_gssapi_state->gss_oid,
1346                                      hdr_signing,
1347                                      data, length,
1348                                      whole_pdu, pdu_length,
1349                                      sig);
1350         if (!NT_STATUS_IS_OK(status)) {
1351                 DEBUG(0, ("gssapi_check_packet(hdr_signing=%u,sig_size=%zu,"
1352                           "data=%zu,pdu=%zu) failed: %s\n",
1353                           hdr_signing, sig->length, length, pdu_length,
1354                           nt_errstr(status)));
1355                 return status;
1356         }
1357
1358         return NT_STATUS_OK;
1359 }
1360
1361 /* Try to figure out what features we actually got on the connection */
1362 static bool gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1363                                        uint32_t feature)
1364 {
1365         struct gensec_gssapi_state *gensec_gssapi_state
1366                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1367         if (feature & GENSEC_FEATURE_SIGN) {
1368                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1369                 if (gensec_gssapi_state->sasl
1370                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1371                         return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1372                                 && (gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG));
1373                 }
1374                 return gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG;
1375         }
1376         if (feature & GENSEC_FEATURE_SEAL) {
1377                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1378                 if (gensec_gssapi_state->sasl
1379                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1380                         return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1381                                  && (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG));
1382                 }
1383                 return gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG;
1384         }
1385         if (feature & GENSEC_FEATURE_SESSION_KEY) {
1386                 /* Only for GSSAPI/Krb5 */
1387                 if (smb_gss_oid_equal(gensec_gssapi_state->gss_oid,
1388                                       gss_mech_krb5)) {
1389                         return true;
1390                 }
1391         }
1392         if (feature & GENSEC_FEATURE_DCE_STYLE) {
1393                 return gensec_gssapi_state->gss_got_flags & GSS_C_DCE_STYLE;
1394         }
1395         if (feature & GENSEC_FEATURE_NEW_SPNEGO) {
1396                 NTSTATUS status;
1397                 uint32_t keytype;
1398
1399                 if (!(gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG)) {
1400                         return false;
1401                 }
1402
1403                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "force_new_spnego", false)) {
1404                         return true;
1405                 }
1406                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "disable_new_spnego", false)) {
1407                         return false;
1408                 }
1409
1410                 status = gssapi_get_session_key(gensec_gssapi_state,
1411                                                 gensec_gssapi_state->gssapi_context, NULL, &keytype);
1412                 /*
1413                  * We should do a proper sig on the mechListMic unless
1414                  * we know we have to be backwards compatible with
1415                  * earlier windows versions.
1416                  *
1417                  * Negotiating a non-krb5
1418                  * mech for example should be regarded as having
1419                  * NEW_SPNEGO
1420                  */
1421                 if (NT_STATUS_IS_OK(status)) {
1422                         switch (keytype) {
1423                         case ENCTYPE_DES_CBC_CRC:
1424                         case ENCTYPE_DES_CBC_MD5:
1425                         case ENCTYPE_ARCFOUR_HMAC:
1426                         case ENCTYPE_DES3_CBC_SHA1:
1427                                 return false;
1428                         }
1429                 }
1430                 return true;
1431         }
1432         /* We can always do async (rather than strict request/reply) packets.  */
1433         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1434                 return true;
1435         }
1436         if (feature & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1437                 return true;
1438         }
1439         return false;
1440 }
1441
1442 static NTTIME gensec_gssapi_expire_time(struct gensec_security *gensec_security)
1443 {
1444         struct gensec_gssapi_state *gensec_gssapi_state =
1445                 talloc_get_type_abort(gensec_security->private_data,
1446                 struct gensec_gssapi_state);
1447
1448         return gensec_gssapi_state->expire_time;
1449 }
1450
1451 /*
1452  * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1453  * (for encrypting some passwords).
1454  *
1455  * This breaks all the abstractions, but what do you expect...
1456  */
1457 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1458                                           TALLOC_CTX *mem_ctx,
1459                                           DATA_BLOB *session_key)
1460 {
1461         struct gensec_gssapi_state *gensec_gssapi_state
1462                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1463         return gssapi_get_session_key(mem_ctx, gensec_gssapi_state->gssapi_context, session_key, NULL);
1464 }
1465
1466 /* Get some basic (and authorization) information about the user on
1467  * this session.  This uses either the PAC (if present) or a local
1468  * database lookup */
1469 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1470                                            TALLOC_CTX *mem_ctx,
1471                                            struct auth_session_info **_session_info)
1472 {
1473         NTSTATUS nt_status;
1474         TALLOC_CTX *tmp_ctx;
1475         struct gensec_gssapi_state *gensec_gssapi_state
1476                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1477         struct auth_session_info *session_info = NULL;
1478         OM_uint32 maj_stat, min_stat;
1479         DATA_BLOB pac_blob, *pac_blob_ptr = NULL;
1480
1481         gss_buffer_desc name_token;
1482         char *principal_string;
1483
1484         tmp_ctx = talloc_named(mem_ctx, 0, "gensec_gssapi_session_info context");
1485         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
1486
1487         maj_stat = gss_display_name (&min_stat,
1488                                      gensec_gssapi_state->client_name,
1489                                      &name_token,
1490                                      NULL);
1491         if (GSS_ERROR(maj_stat)) {
1492                 DEBUG(1, ("GSS display_name failed: %s\n",
1493                           gssapi_error_string(tmp_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1494                 talloc_free(tmp_ctx);
1495                 return NT_STATUS_FOOBAR;
1496         }
1497
1498         principal_string = talloc_strndup(tmp_ctx,
1499                                           (const char *)name_token.value,
1500                                           name_token.length);
1501
1502         gss_release_buffer(&min_stat, &name_token);
1503
1504         if (!principal_string) {
1505                 talloc_free(tmp_ctx);
1506                 return NT_STATUS_NO_MEMORY;
1507         }
1508
1509         nt_status = gssapi_obtain_pac_blob(tmp_ctx,  gensec_gssapi_state->gssapi_context,
1510                                            gensec_gssapi_state->client_name,
1511                                            &pac_blob);
1512
1513         /* IF we have the PAC - otherwise we need to get this
1514          * data from elsewere - local ldb, or (TODO) lookup of some
1515          * kind...
1516          */
1517         if (NT_STATUS_IS_OK(nt_status)) {
1518                 pac_blob_ptr = &pac_blob;
1519         }
1520         nt_status = gensec_generate_session_info_pac(tmp_ctx,
1521                                                      gensec_security,
1522                                                      gensec_gssapi_state->smb_krb5_context,
1523                                                      pac_blob_ptr, principal_string,
1524                                                      gensec_get_remote_address(gensec_security),
1525                                                      &session_info);
1526         if (!NT_STATUS_IS_OK(nt_status)) {
1527                 talloc_free(tmp_ctx);
1528                 return nt_status;
1529         }
1530
1531         nt_status = gensec_gssapi_session_key(gensec_security, session_info, &session_info->session_key);
1532         if (!NT_STATUS_IS_OK(nt_status)) {
1533                 talloc_free(tmp_ctx);
1534                 return nt_status;
1535         }
1536
1537         if (gensec_gssapi_state->gss_got_flags & GSS_C_DELEG_FLAG &&
1538             gensec_gssapi_state->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
1539                 krb5_error_code ret;
1540                 const char *error_string;
1541
1542                 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1543
1544                 /*
1545                  * Create anonymous credentials for now.
1546                  *
1547                  * We will update them with the provided client gss creds.
1548                  */
1549                 session_info->credentials = cli_credentials_init_anon(session_info);
1550                 if (session_info->credentials == NULL) {
1551                         talloc_free(tmp_ctx);
1552                         return NT_STATUS_NO_MEMORY;
1553                 }
1554
1555                 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1556                                                            gensec_security->settings->lp_ctx,
1557                                                            gensec_gssapi_state->delegated_cred_handle,
1558                                                            CRED_SPECIFIED, &error_string);
1559                 if (ret) {
1560                         talloc_free(tmp_ctx);
1561                         DEBUG(2,("Failed to get gss creds: %s\n", error_string));
1562                         return NT_STATUS_NO_MEMORY;
1563                 }
1564
1565                 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1566                 cli_credentials_set_kerberos_state(session_info->credentials,
1567                                                    CRED_USE_KERBEROS_REQUIRED,
1568                                                    CRED_SPECIFIED);
1569
1570                 /* It has been taken from this place... */
1571                 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1572         } else {
1573                 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1574         }
1575
1576         *_session_info = talloc_steal(mem_ctx, session_info);
1577         talloc_free(tmp_ctx);
1578
1579         return NT_STATUS_OK;
1580 }
1581
1582 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
1583 {
1584         struct gensec_gssapi_state *gensec_gssapi_state
1585                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1586         size_t sig_size;
1587
1588         if (gensec_gssapi_state->sig_size > 0) {
1589                 return gensec_gssapi_state->sig_size;
1590         }
1591
1592         sig_size = gssapi_get_sig_size(gensec_gssapi_state->gssapi_context,
1593                                        gensec_gssapi_state->gss_oid,
1594                                        gensec_gssapi_state->gss_got_flags,
1595                                        data_size);
1596
1597         gensec_gssapi_state->sig_size = sig_size;
1598         return gensec_gssapi_state->sig_size;
1599 }
1600
1601 static const char *gensec_gssapi_final_auth_type(struct gensec_security *gensec_security)
1602 {
1603         struct gensec_gssapi_state *gensec_gssapi_state
1604                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1605         /* Only return the string for GSSAPI/Krb5 */
1606         if (smb_gss_oid_equal(gensec_gssapi_state->gss_oid,
1607                               gss_mech_krb5)) {
1608                 return GENSEC_FINAL_AUTH_TYPE_KRB5;
1609         } else {
1610                 return "gensec_gssapi: UNKNOWN MECH";
1611         }
1612 }
1613
1614 static const char *gensec_gssapi_krb5_oids[] = {
1615         GENSEC_OID_KERBEROS5_OLD,
1616         GENSEC_OID_KERBEROS5,
1617         NULL
1618 };
1619
1620 static const char *gensec_gssapi_spnego_oids[] = {
1621         GENSEC_OID_SPNEGO,
1622         NULL
1623 };
1624
1625 /* As a server, this could in theory accept any GSSAPI mech */
1626 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1627         .name           = "gssapi_spnego",
1628         .sasl_name      = "GSS-SPNEGO",
1629         .auth_type      = DCERPC_AUTH_TYPE_SPNEGO,
1630         .oid            = gensec_gssapi_spnego_oids,
1631         .client_start   = gensec_gssapi_client_start,
1632         .server_start   = gensec_gssapi_server_start,
1633         .magic          = gensec_magic_check_krb5_oid,
1634         .update_send    = gensec_gssapi_update_send,
1635         .update_recv    = gensec_gssapi_update_recv,
1636         .session_key    = gensec_gssapi_session_key,
1637         .session_info   = gensec_gssapi_session_info,
1638         .sign_packet    = gensec_gssapi_sign_packet,
1639         .check_packet   = gensec_gssapi_check_packet,
1640         .seal_packet    = gensec_gssapi_seal_packet,
1641         .unseal_packet  = gensec_gssapi_unseal_packet,
1642         .max_input_size   = gensec_gssapi_max_input_size,
1643         .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1644         .wrap           = gensec_gssapi_wrap,
1645         .unwrap         = gensec_gssapi_unwrap,
1646         .have_feature   = gensec_gssapi_have_feature,
1647         .expire_time    = gensec_gssapi_expire_time,
1648         .final_auth_type = gensec_gssapi_final_auth_type,
1649         .enabled        = false,
1650         .kerberos       = true,
1651         .priority       = GENSEC_GSSAPI
1652 };
1653
1654 /* As a server, this could in theory accept any GSSAPI mech */
1655 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1656         .name           = "gssapi_krb5",
1657         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
1658         .oid            = gensec_gssapi_krb5_oids,
1659         .client_start   = gensec_gssapi_client_start,
1660         .server_start   = gensec_gssapi_server_start,
1661         .magic          = gensec_magic_check_krb5_oid,
1662         .update_send    = gensec_gssapi_update_send,
1663         .update_recv    = gensec_gssapi_update_recv,
1664         .session_key    = gensec_gssapi_session_key,
1665         .session_info   = gensec_gssapi_session_info,
1666         .sig_size       = gensec_gssapi_sig_size,
1667         .sign_packet    = gensec_gssapi_sign_packet,
1668         .check_packet   = gensec_gssapi_check_packet,
1669         .seal_packet    = gensec_gssapi_seal_packet,
1670         .unseal_packet  = gensec_gssapi_unseal_packet,
1671         .max_input_size   = gensec_gssapi_max_input_size,
1672         .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1673         .wrap           = gensec_gssapi_wrap,
1674         .unwrap         = gensec_gssapi_unwrap,
1675         .have_feature   = gensec_gssapi_have_feature,
1676         .expire_time    = gensec_gssapi_expire_time,
1677         .final_auth_type = gensec_gssapi_final_auth_type,
1678         .enabled        = true,
1679         .kerberos       = true,
1680         .priority       = GENSEC_GSSAPI
1681 };
1682
1683 /* As a server, this could in theory accept any GSSAPI mech */
1684 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1685         .name             = "gssapi_krb5_sasl",
1686         .sasl_name        = "GSSAPI",
1687         .client_start     = gensec_gssapi_sasl_client_start,
1688         .server_start     = gensec_gssapi_sasl_server_start,
1689         .update_send      = gensec_gssapi_update_send,
1690         .update_recv      = gensec_gssapi_update_recv,
1691         .session_key      = gensec_gssapi_session_key,
1692         .session_info     = gensec_gssapi_session_info,
1693         .max_input_size   = gensec_gssapi_max_input_size,
1694         .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1695         .wrap             = gensec_gssapi_wrap,
1696         .unwrap           = gensec_gssapi_unwrap,
1697         .have_feature     = gensec_gssapi_have_feature,
1698         .expire_time      = gensec_gssapi_expire_time,
1699         .final_auth_type = gensec_gssapi_final_auth_type,
1700         .enabled          = true,
1701         .kerberos         = true,
1702         .priority         = GENSEC_GSSAPI
1703 };
1704
1705 _PUBLIC_ NTSTATUS gensec_gssapi_init(TALLOC_CTX *ctx)
1706 {
1707         NTSTATUS ret;
1708
1709         ret = gensec_register(ctx, &gensec_gssapi_spnego_security_ops);
1710         if (!NT_STATUS_IS_OK(ret)) {
1711                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1712                         gensec_gssapi_spnego_security_ops.name));
1713                 return ret;
1714         }
1715
1716         ret = gensec_register(ctx, &gensec_gssapi_krb5_security_ops);
1717         if (!NT_STATUS_IS_OK(ret)) {
1718                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1719                         gensec_gssapi_krb5_security_ops.name));
1720                 return ret;
1721         }
1722
1723         ret = gensec_register(ctx, &gensec_gssapi_sasl_krb5_security_ops);
1724         if (!NT_STATUS_IS_OK(ret)) {
1725                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1726                         gensec_gssapi_sasl_krb5_security_ops.name));
1727                 return ret;
1728         }
1729
1730         return ret;
1731 }