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 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 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 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 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 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                                 return NT_STATUS_INVALID_PARAMETER;
 840                         }
 841
 842                         memcpy(maxlength_proposed, output_token.value, 4);
 843                         gss_release_buffer(&min_stat, &output_token);
 844
 845                         /* first byte is the proposed security */
 846                         security_supported = maxlength_proposed[0];
 847                         maxlength_proposed[0] = '\0';
 848
 849                         /* Rest is the proposed max wrap length */
 850                         gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
 851                                                                      gensec_gssapi_state->max_wrap_buf_size);
 852                         gensec_gssapi_state->sasl_protection = 0;
 853                         if (security_supported & NEG_SEAL) {
 854                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 855                                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 856                                 }
 857                         }
 858                         if (security_supported & NEG_SIGN) {
 859                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 860                                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 861                                 }
 862                         }
 863                         if (security_supported & NEG_NONE) {
 864                                 gensec_gssapi_state->sasl_protection |= NEG_NONE;
 865                         }
 866                         if (gensec_gssapi_state->sasl_protection == 0) {
 867                                 DEBUG(1, ("Remote server does not support unprotected connections\n"));
 868                                 return NT_STATUS_ACCESS_DENIED;
 869                         }
 870
 871                         /* Send back the negotiated max length */
 872
 873                         RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
 874
 875                         maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
 876
 877                         input_token.value = maxlength_accepted;
 878                         input_token.length = sizeof(maxlength_accepted);
 879
 880                         maj_stat = gss_wrap(&min_stat,
 881                                             gensec_gssapi_state->gssapi_context,
 882                                             false,
 883                                             GSS_C_QOP_DEFAULT,
 884                                             &input_token,
 885                                             &conf_state,
 886                                             &output_token);
 887                         if (GSS_ERROR(maj_stat)) {
 888                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 889                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 890                                 return NT_STATUS_ACCESS_DENIED;
 891                         }
 892
 893                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 894                         gss_release_buffer(&min_stat, &output_token);
 895
 896                         /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 897                         gensec_gssapi_state->sasl_state = STAGE_DONE;
 898
 899                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 900                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically sealed\n"));
 901                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 902                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically signed\n"));
 903                         } else {
 904                                 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographically protection\n"));
 905                         }
 906
 907                         return NT_STATUS_OK;
 908                 }
 909                 case GENSEC_SERVER:
 910                 {
 911                         uint8_t maxlength_proposed[4];
 912                         uint8_t security_supported = 0x0;
 913                         int conf_state;
 914
 915                         /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
 916                         if (in.length != 0) {
 917                                 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
 918                         }
 919
 920                         /* Give the client some idea what we will support */
 921
 922                         RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
 923                         /* first byte is the proposed security */
 924                         maxlength_proposed[0] = '\0';
 925
 926                         gensec_gssapi_state->sasl_protection = 0;
 927                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 928                                 security_supported |= NEG_SEAL;
 929                         }
 930                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 931                                 security_supported |= NEG_SIGN;
 932                         }
 933                         if (security_supported == 0) {
 934                                 /* If we don't support anything, this must be 0 */
 935                                 RSIVAL(maxlength_proposed, 0, 0x0);
 936                         }
 937
 938                         /* TODO:  We may not wish to support this */
 939                         security_supported |= NEG_NONE;
 940                         maxlength_proposed[0] = security_supported;
 941
 942                         input_token.value = maxlength_proposed;
 943                         input_token.length = sizeof(maxlength_proposed);
 944
 945                         maj_stat = gss_wrap(&min_stat,
 946                                             gensec_gssapi_state->gssapi_context,
 947                                             false,
 948                                             GSS_C_QOP_DEFAULT,
 949                                             &input_token,
 950                                             &conf_state,
 951                                             &output_token);
 952                         if (GSS_ERROR(maj_stat)) {
 953                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 954                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 955                                 return NT_STATUS_ACCESS_DENIED;
 956                         }
 957
 958                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 959                         gss_release_buffer(&min_stat, &output_token);
 960
 961                         gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
 962                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 963                 }
 964                 default:
 965                         return NT_STATUS_INVALID_PARAMETER;
 966
 967                 }
 968         }
 969         /* This is s server-only stage */
 970         case STAGE_SASL_SSF_ACCEPT:
 971         {
 972                 uint8_t maxlength_accepted[4];
 973                 uint8_t security_accepted;
 974                 int conf_state;
 975                 gss_qop_t qop_state;
 976                 input_token.length = in.length;
 977                 input_token.value = in.data;
 978
 979                 maj_stat = gss_unwrap(&min_stat,
 980                                       gensec_gssapi_state->gssapi_context,
 981                                       &input_token,
 982                                       &output_token,
 983                                       &conf_state,
 984                                       &qop_state);
 985                 if (GSS_ERROR(maj_stat)) {
 986                         DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 987                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 988                         return NT_STATUS_ACCESS_DENIED;
 989                 }
 990
 991                 if (output_token.length < 4) {
 992                         return NT_STATUS_INVALID_PARAMETER;
 993                 }
 994
 995                 memcpy(maxlength_accepted, output_token.value, 4);
 996                 gss_release_buffer(&min_stat, &output_token);
 997
 998                 /* first byte is the proposed security */
 999                 security_accepted = maxlength_accepted[0];
1000                 maxlength_accepted[0] = '\0';
1001
1002                 /* Rest is the proposed max wrap length */
1003                 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
1004                                                              gensec_gssapi_state->max_wrap_buf_size);
1005
1006                 gensec_gssapi_state->sasl_protection = 0;
1007                 if (security_accepted & NEG_SEAL) {
1008                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
1009                                 DEBUG(1, ("Remote client wanted seal, but gensec refused\n"));
1010                                 return NT_STATUS_ACCESS_DENIED;
1011                         }
1012                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
1013                 }
1014                 if (security_accepted & NEG_SIGN) {
1015                         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
1016                                 DEBUG(1, ("Remote client wanted sign, but gensec refused\n"));
1017                                 return NT_STATUS_ACCESS_DENIED;
1018                         }
1019                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
1020                 }
1021                 if (security_accepted & NEG_NONE) {
1022                         gensec_gssapi_state->sasl_protection |= NEG_NONE;
1023                 }
1024
1025                 /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
1026                 gensec_gssapi_state->sasl_state = STAGE_DONE;
1027                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
1028                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically sealed\n"));
1029                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
1030                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically signed\n"));
1031                 } else {
1032                         DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
1033                 }
1034
1035                 *out = data_blob(NULL, 0);
1036                 return NT_STATUS_OK;
1037         }
1038         default:
1039                 return NT_STATUS_INVALID_PARAMETER;
1040         }
1041 }
1042
1043 struct gensec_gssapi_update_state {
1044         NTSTATUS status;
1045         DATA_BLOB out;
1046 };
1047
1048 static struct tevent_req *gensec_gssapi_update_send(TALLOC_CTX *mem_ctx,
1049                                                     struct tevent_context *ev,
1050                                                     struct gensec_security *gensec_security,
1051                                                     const DATA_BLOB in)
1052 {
1053         struct tevent_req *req = NULL;
1054         struct gensec_gssapi_update_state *state = NULL;
1055         NTSTATUS status;
1056
1057         req = tevent_req_create(mem_ctx, &state,
1058                                 struct gensec_gssapi_update_state);
1059         if (req == NULL) {
1060                 return NULL;
1061         }
1062
1063         status = gensec_gssapi_update_internal(gensec_security,
1064                                                state, ev, in,
1065                                                &state->out);
1066         state->status = status;
1067         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
1068                 tevent_req_done(req);
1069                 return tevent_req_post(req, ev);
1070         }
1071         if (tevent_req_nterror(req, status)) {
1072                 return tevent_req_post(req, ev);
1073         }
1074
1075         tevent_req_done(req);
1076         return tevent_req_post(req, ev);
1077 }
1078
1079 static NTSTATUS gensec_gssapi_update_recv(struct tevent_req *req,
1080                                           TALLOC_CTX *out_mem_ctx,
1081                                           DATA_BLOB *out)
1082 {
1083         struct gensec_gssapi_update_state *state =
1084                 tevent_req_data(req,
1085                 struct gensec_gssapi_update_state);
1086         NTSTATUS status;
1087
1088         *out = data_blob_null;
1089
1090         if (tevent_req_is_nterror(req, &status)) {
1091                 tevent_req_received(req);
1092                 return status;
1093         }
1094
1095         *out = state->out;
1096         talloc_steal(out_mem_ctx, state->out.data);
1097         status = state->status;
1098         tevent_req_received(req);
1099         return status;
1100 }
1101
1102 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
1103                                    TALLOC_CTX *mem_ctx,
1104                                    const DATA_BLOB *in,
1105                                    DATA_BLOB *out)
1106 {
1107         struct gensec_gssapi_state *gensec_gssapi_state
1108                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1109         OM_uint32 maj_stat, min_stat;
1110         gss_buffer_desc input_token, output_token;
1111         int conf_state;
1112         input_token.length = in->length;
1113         input_token.value = in->data;
1114
1115         maj_stat = gss_wrap(&min_stat,
1116                             gensec_gssapi_state->gssapi_context,
1117                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
1118                             GSS_C_QOP_DEFAULT,
1119                             &input_token,
1120                             &conf_state,
1121                             &output_token);
1122         if (GSS_ERROR(maj_stat)) {
1123                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
1124                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1125                 return NT_STATUS_ACCESS_DENIED;
1126         }
1127
1128         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
1129         gss_release_buffer(&min_stat, &output_token);
1130
1131         if (gensec_gssapi_state->sasl) {
1132                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
1133                 if (max_wrapped_size < out->length) {
1134                         DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
1135                                   (unsigned)in->length,
1136                                   (unsigned)out->length,
1137                                   (unsigned int)max_wrapped_size));
1138                         return NT_STATUS_INVALID_PARAMETER;
1139                 }
1140         }
1141
1142         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1143             && !conf_state) {
1144                 return NT_STATUS_ACCESS_DENIED;
1145         }
1146         return NT_STATUS_OK;
1147 }
1148
1149 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
1150                                      TALLOC_CTX *mem_ctx,
1151                                      const DATA_BLOB *in,
1152                                      DATA_BLOB *out)
1153 {
1154         struct gensec_gssapi_state *gensec_gssapi_state
1155                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1156         OM_uint32 maj_stat, min_stat;
1157         gss_buffer_desc input_token, output_token;
1158         int conf_state;
1159         gss_qop_t qop_state;
1160         input_token.length = in->length;
1161         input_token.value = in->data;
1162
1163         if (gensec_gssapi_state->sasl) {
1164                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
1165                 if (max_wrapped_size < in->length) {
1166                         DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
1167                         return NT_STATUS_INVALID_PARAMETER;
1168                 }
1169         }
1170
1171         maj_stat = gss_unwrap(&min_stat,
1172                               gensec_gssapi_state->gssapi_context,
1173                               &input_token,
1174                               &output_token,
1175                               &conf_state,
1176                               &qop_state);
1177         if (GSS_ERROR(maj_stat)) {
1178                 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
1179                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1180                 return NT_STATUS_ACCESS_DENIED;
1181         }
1182
1183         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
1184         gss_release_buffer(&min_stat, &output_token);
1185
1186         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1187             && !conf_state) {
1188                 return NT_STATUS_ACCESS_DENIED;
1189         }
1190         return NT_STATUS_OK;
1191 }
1192
1193 /* Find out the maximum input size negotiated on this connection */
1194
1195 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
1196 {
1197         struct gensec_gssapi_state *gensec_gssapi_state
1198                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1199         OM_uint32 maj_stat, min_stat;
1200         OM_uint32 max_input_size;
1201
1202         maj_stat = gss_wrap_size_limit(&min_stat,
1203                                        gensec_gssapi_state->gssapi_context,
1204                                        gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
1205                                        GSS_C_QOP_DEFAULT,
1206                                        gensec_gssapi_state->max_wrap_buf_size,
1207                                        &max_input_size);
1208         if (GSS_ERROR(maj_stat)) {
1209                 TALLOC_CTX *mem_ctx = talloc_new(NULL);
1210                 DEBUG(1, ("gensec_gssapi_max_input_size: determining signature size with gss_wrap_size_limit failed: %s\n",
1211                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1212                 talloc_free(mem_ctx);
1213                 return 0;
1214         }
1215
1216         return max_input_size;
1217 }
1218
1219 /* Find out the maximum output size negotiated on this connection */
1220 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
1221 {
1222         struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
1223         return gensec_gssapi_state->max_wrap_buf_size;
1224 }
1225
1226 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
1227                                           TALLOC_CTX *mem_ctx,
1228                                           uint8_t *data, size_t length,
1229                                           const uint8_t *whole_pdu, size_t pdu_length,
1230                                           DATA_BLOB *sig)
1231 {
1232         struct gensec_gssapi_state *gensec_gssapi_state
1233                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1234         bool hdr_signing = false;
1235         size_t sig_size = 0;
1236         NTSTATUS status;
1237
1238         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1239                 hdr_signing = true;
1240         }
1241
1242         sig_size = gensec_gssapi_sig_size(gensec_security, length);
1243
1244         status = gssapi_seal_packet(gensec_gssapi_state->gssapi_context,
1245                                     gensec_gssapi_state->gss_oid,
1246                                     hdr_signing, sig_size,
1247                                     data, length,
1248                                     whole_pdu, pdu_length,
1249                                     mem_ctx, sig);
1250         if (!NT_STATUS_IS_OK(status)) {
1251                 DEBUG(0, ("gssapi_seal_packet(hdr_signing=%u,sig_size=%zu,"
1252                           "data=%zu,pdu=%zu) failed: %s\n",
1253                           hdr_signing, sig_size, length, pdu_length,
1254                           nt_errstr(status)));
1255                 return status;
1256         }
1257
1258         return NT_STATUS_OK;
1259 }
1260
1261 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
1262                                             uint8_t *data, size_t length,
1263                                             const uint8_t *whole_pdu, size_t pdu_length,
1264                                             const DATA_BLOB *sig)
1265 {
1266         struct gensec_gssapi_state *gensec_gssapi_state
1267                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1268         bool hdr_signing = false;
1269         NTSTATUS status;
1270
1271         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1272                 hdr_signing = true;
1273         }
1274
1275         status = gssapi_unseal_packet(gensec_gssapi_state->gssapi_context,
1276                                       gensec_gssapi_state->gss_oid,
1277                                       hdr_signing,
1278                                       data, length,
1279                                       whole_pdu, pdu_length,
1280                                       sig);
1281         if (!NT_STATUS_IS_OK(status)) {
1282                 DEBUG(0, ("gssapi_unseal_packet(hdr_signing=%u,sig_size=%zu,"
1283                           "data=%zu,pdu=%zu) failed: %s\n",
1284                           hdr_signing, sig->length, length, pdu_length,
1285                           nt_errstr(status)));
1286                 return status;
1287         }
1288
1289         return NT_STATUS_OK;
1290 }
1291
1292 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1293                                           TALLOC_CTX *mem_ctx,
1294                                           const uint8_t *data, size_t length,
1295                                           const uint8_t *whole_pdu, size_t pdu_length,
1296                                           DATA_BLOB *sig)
1297 {
1298         struct gensec_gssapi_state *gensec_gssapi_state
1299                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1300         bool hdr_signing = false;
1301         NTSTATUS status;
1302
1303         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1304                 hdr_signing = true;
1305         }
1306
1307         status = gssapi_sign_packet(gensec_gssapi_state->gssapi_context,
1308                                     gensec_gssapi_state->gss_oid,
1309                                     hdr_signing,
1310                                     data, length,
1311                                     whole_pdu, pdu_length,
1312                                     mem_ctx, sig);
1313         if (!NT_STATUS_IS_OK(status)) {
1314                 DEBUG(0, ("gssapi_sign_packet(hdr_signing=%u,"
1315                           "data=%zu,pdu=%zu) failed: %s\n",
1316                           hdr_signing, length, pdu_length,
1317                           nt_errstr(status)));
1318                 return status;
1319         }
1320
1321         return NT_STATUS_OK;
1322 }
1323
1324 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1325                                            const uint8_t *data, size_t length,
1326                                            const uint8_t *whole_pdu, size_t pdu_length,
1327                                            const DATA_BLOB *sig)
1328 {
1329         struct gensec_gssapi_state *gensec_gssapi_state
1330                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1331         bool hdr_signing = false;
1332         NTSTATUS status;
1333
1334         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1335                 hdr_signing = true;
1336         }
1337
1338         status = gssapi_check_packet(gensec_gssapi_state->gssapi_context,
1339                                      gensec_gssapi_state->gss_oid,
1340                                      hdr_signing,
1341                                      data, length,
1342                                      whole_pdu, pdu_length,
1343                                      sig);
1344         if (!NT_STATUS_IS_OK(status)) {
1345                 DEBUG(0, ("gssapi_check_packet(hdr_signing=%u,sig_size=%zu,"
1346                           "data=%zu,pdu=%zu) failed: %s\n",
1347                           hdr_signing, sig->length, length, pdu_length,
1348                           nt_errstr(status)));
1349                 return status;
1350         }
1351
1352         return NT_STATUS_OK;
1353 }
1354
1355 /* Try to figure out what features we actually got on the connection */
1356 static bool gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1357                                        uint32_t feature)
1358 {
1359         struct gensec_gssapi_state *gensec_gssapi_state
1360                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1361         if (feature & GENSEC_FEATURE_SIGN) {
1362                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1363                 if (gensec_gssapi_state->sasl
1364                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1365                         return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1366                                 && (gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG));
1367                 }
1368                 return gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG;
1369         }
1370         if (feature & GENSEC_FEATURE_SEAL) {
1371                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1372                 if (gensec_gssapi_state->sasl
1373                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1374                         return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1375                                  && (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG));
1376                 }
1377                 return gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG;
1378         }
1379         if (feature & GENSEC_FEATURE_SESSION_KEY) {
1380                 /* Only for GSSAPI/Krb5 */
1381                 if (smb_gss_oid_equal(gensec_gssapi_state->gss_oid,
1382                                       gss_mech_krb5)) {
1383                         return true;
1384                 }
1385         }
1386         if (feature & GENSEC_FEATURE_DCE_STYLE) {
1387                 return gensec_gssapi_state->gss_got_flags & GSS_C_DCE_STYLE;
1388         }
1389         if (feature & GENSEC_FEATURE_NEW_SPNEGO) {
1390                 NTSTATUS status;
1391                 uint32_t keytype;
1392
1393                 if (!(gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG)) {
1394                         return false;
1395                 }
1396
1397                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "force_new_spnego", false)) {
1398                         return true;
1399                 }
1400                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "disable_new_spnego", false)) {
1401                         return false;
1402                 }
1403
1404                 status = gssapi_get_session_key(gensec_gssapi_state,
1405                                                 gensec_gssapi_state->gssapi_context, NULL, &keytype);
1406                 /*
1407                  * We should do a proper sig on the mechListMic unless
1408                  * we know we have to be backwards compatible with
1409                  * earlier windows versions.
1410                  *
1411                  * Negotiating a non-krb5
1412                  * mech for example should be regarded as having
1413                  * NEW_SPNEGO
1414                  */
1415                 if (NT_STATUS_IS_OK(status)) {
1416                         switch (keytype) {
1417                         case ENCTYPE_DES_CBC_CRC:
1418                         case ENCTYPE_DES_CBC_MD5:
1419                         case ENCTYPE_ARCFOUR_HMAC:
1420                         case ENCTYPE_DES3_CBC_SHA1:
1421                                 return false;
1422                         }
1423                 }
1424                 return true;
1425         }
1426         /* We can always do async (rather than strict request/reply) packets.  */
1427         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1428                 return true;
1429         }
1430         if (feature & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1431                 return true;
1432         }
1433         return false;
1434 }
1435
1436 static NTTIME gensec_gssapi_expire_time(struct gensec_security *gensec_security)
1437 {
1438         struct gensec_gssapi_state *gensec_gssapi_state =
1439                 talloc_get_type_abort(gensec_security->private_data,
1440                 struct gensec_gssapi_state);
1441
1442         return gensec_gssapi_state->expire_time;
1443 }
1444
1445 /*
1446  * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1447  * (for encrypting some passwords).
1448  *
1449  * This breaks all the abstractions, but what do you expect...
1450  */
1451 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1452                                           TALLOC_CTX *mem_ctx,
1453                                           DATA_BLOB *session_key)
1454 {
1455         struct gensec_gssapi_state *gensec_gssapi_state
1456                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1457         return gssapi_get_session_key(mem_ctx, gensec_gssapi_state->gssapi_context, session_key, NULL);
1458 }
1459
1460 /* Get some basic (and authorization) information about the user on
1461  * this session.  This uses either the PAC (if present) or a local
1462  * database lookup */
1463 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1464                                            TALLOC_CTX *mem_ctx,
1465                                            struct auth_session_info **_session_info)
1466 {
1467         NTSTATUS nt_status;
1468         TALLOC_CTX *tmp_ctx;
1469         struct gensec_gssapi_state *gensec_gssapi_state
1470                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1471         struct auth_session_info *session_info = NULL;
1472         OM_uint32 maj_stat, min_stat;
1473         DATA_BLOB pac_blob, *pac_blob_ptr = NULL;
1474
1475         gss_buffer_desc name_token;
1476         char *principal_string;
1477
1478         tmp_ctx = talloc_named(mem_ctx, 0, "gensec_gssapi_session_info context");
1479         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
1480
1481         maj_stat = gss_display_name (&min_stat,
1482                                      gensec_gssapi_state->client_name,
1483                                      &name_token,
1484                                      NULL);
1485         if (GSS_ERROR(maj_stat)) {
1486                 DEBUG(1, ("GSS display_name failed: %s\n",
1487                           gssapi_error_string(tmp_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1488                 talloc_free(tmp_ctx);
1489                 return NT_STATUS_FOOBAR;
1490         }
1491
1492         principal_string = talloc_strndup(tmp_ctx,
1493                                           (const char *)name_token.value,
1494                                           name_token.length);
1495
1496         gss_release_buffer(&min_stat, &name_token);
1497
1498         if (!principal_string) {
1499                 talloc_free(tmp_ctx);
1500                 return NT_STATUS_NO_MEMORY;
1501         }
1502
1503         nt_status = gssapi_obtain_pac_blob(tmp_ctx,  gensec_gssapi_state->gssapi_context,
1504                                            gensec_gssapi_state->client_name,
1505                                            &pac_blob);
1506
1507         /* IF we have the PAC - otherwise we need to get this
1508          * data from elsewere - local ldb, or (TODO) lookup of some
1509          * kind...
1510          */
1511         if (NT_STATUS_IS_OK(nt_status)) {
1512                 pac_blob_ptr = &pac_blob;
1513         }
1514         nt_status = gensec_generate_session_info_pac(tmp_ctx,
1515                                                      gensec_security,
1516                                                      gensec_gssapi_state->smb_krb5_context,
1517                                                      pac_blob_ptr, principal_string,
1518                                                      gensec_get_remote_address(gensec_security),
1519                                                      &session_info);
1520         if (!NT_STATUS_IS_OK(nt_status)) {
1521                 talloc_free(tmp_ctx);
1522                 return nt_status;
1523         }
1524
1525         nt_status = gensec_gssapi_session_key(gensec_security, session_info, &session_info->session_key);
1526         if (!NT_STATUS_IS_OK(nt_status)) {
1527                 talloc_free(tmp_ctx);
1528                 return nt_status;
1529         }
1530
1531         if (gensec_gssapi_state->gss_got_flags & GSS_C_DELEG_FLAG &&
1532             gensec_gssapi_state->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
1533                 krb5_error_code ret;
1534                 const char *error_string;
1535
1536                 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1537
1538                 /*
1539                  * Create anonymous credentials for now.
1540                  *
1541                  * We will update them with the provided client gss creds.
1542                  */
1543                 session_info->credentials = cli_credentials_init_anon(session_info);
1544                 if (session_info->credentials == NULL) {
1545                         talloc_free(tmp_ctx);
1546                         return NT_STATUS_NO_MEMORY;
1547                 }
1548
1549                 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1550                                                            gensec_security->settings->lp_ctx,
1551                                                            gensec_gssapi_state->delegated_cred_handle,
1552                                                            CRED_SPECIFIED, &error_string);
1553                 if (ret) {
1554                         talloc_free(tmp_ctx);
1555                         DEBUG(2,("Failed to get gss creds: %s\n", error_string));
1556                         return NT_STATUS_NO_MEMORY;
1557                 }
1558
1559                 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1560                 cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
1561
1562                 /* It has been taken from this place... */
1563                 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1564         } else {
1565                 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1566         }
1567
1568         *_session_info = talloc_steal(mem_ctx, session_info);
1569         talloc_free(tmp_ctx);
1570
1571         return NT_STATUS_OK;
1572 }
1573
1574 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
1575 {
1576         struct gensec_gssapi_state *gensec_gssapi_state
1577                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1578         size_t sig_size;
1579
1580         if (gensec_gssapi_state->sig_size > 0) {
1581                 return gensec_gssapi_state->sig_size;
1582         }
1583
1584         sig_size = gssapi_get_sig_size(gensec_gssapi_state->gssapi_context,
1585                                        gensec_gssapi_state->gss_oid,
1586                                        gensec_gssapi_state->gss_got_flags,
1587                                        data_size);
1588
1589         gensec_gssapi_state->sig_size = sig_size;
1590         return gensec_gssapi_state->sig_size;
1591 }
1592
1593 static const char *gensec_gssapi_final_auth_type(struct gensec_security *gensec_security)
1594 {
1595         struct gensec_gssapi_state *gensec_gssapi_state
1596                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1597         /* Only return the string for GSSAPI/Krb5 */
1598         if (smb_gss_oid_equal(gensec_gssapi_state->gss_oid,
1599                               gss_mech_krb5)) {
1600                 return GENSEC_FINAL_AUTH_TYPE_KRB5;
1601         } else {
1602                 return "gensec_gssapi: UNKNOWN MECH";
1603         }
1604 }
1605
1606 static const char *gensec_gssapi_krb5_oids[] = {
1607         GENSEC_OID_KERBEROS5_OLD,
1608         GENSEC_OID_KERBEROS5,
1609         NULL
1610 };
1611
1612 static const char *gensec_gssapi_spnego_oids[] = {
1613         GENSEC_OID_SPNEGO,
1614         NULL
1615 };
1616
1617 /* As a server, this could in theory accept any GSSAPI mech */
1618 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1619         .name           = "gssapi_spnego",
1620         .sasl_name      = "GSS-SPNEGO",
1621         .auth_type      = DCERPC_AUTH_TYPE_SPNEGO,
1622         .oid            = gensec_gssapi_spnego_oids,
1623         .client_start   = gensec_gssapi_client_start,
1624         .server_start   = gensec_gssapi_server_start,
1625         .magic          = gensec_magic_check_krb5_oid,
1626         .update_send    = gensec_gssapi_update_send,
1627         .update_recv    = gensec_gssapi_update_recv,
1628         .session_key    = gensec_gssapi_session_key,
1629         .session_info   = gensec_gssapi_session_info,
1630         .sign_packet    = gensec_gssapi_sign_packet,
1631         .check_packet   = gensec_gssapi_check_packet,
1632         .seal_packet    = gensec_gssapi_seal_packet,
1633         .unseal_packet  = gensec_gssapi_unseal_packet,
1634         .max_input_size   = gensec_gssapi_max_input_size,
1635         .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1636         .wrap           = gensec_gssapi_wrap,
1637         .unwrap         = gensec_gssapi_unwrap,
1638         .have_feature   = gensec_gssapi_have_feature,
1639         .expire_time    = gensec_gssapi_expire_time,
1640         .final_auth_type = gensec_gssapi_final_auth_type,
1641         .enabled        = false,
1642         .kerberos       = true,
1643         .priority       = GENSEC_GSSAPI
1644 };
1645
1646 /* As a server, this could in theory accept any GSSAPI mech */
1647 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1648         .name           = "gssapi_krb5",
1649         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
1650         .oid            = gensec_gssapi_krb5_oids,
1651         .client_start   = gensec_gssapi_client_start,
1652         .server_start   = gensec_gssapi_server_start,
1653         .magic          = gensec_magic_check_krb5_oid,
1654         .update_send    = gensec_gssapi_update_send,
1655         .update_recv    = gensec_gssapi_update_recv,
1656         .session_key    = gensec_gssapi_session_key,
1657         .session_info   = gensec_gssapi_session_info,
1658         .sig_size       = gensec_gssapi_sig_size,
1659         .sign_packet    = gensec_gssapi_sign_packet,
1660         .check_packet   = gensec_gssapi_check_packet,
1661         .seal_packet    = gensec_gssapi_seal_packet,
1662         .unseal_packet  = gensec_gssapi_unseal_packet,
1663         .max_input_size   = gensec_gssapi_max_input_size,
1664         .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1665         .wrap           = gensec_gssapi_wrap,
1666         .unwrap         = gensec_gssapi_unwrap,
1667         .have_feature   = gensec_gssapi_have_feature,
1668         .expire_time    = gensec_gssapi_expire_time,
1669         .final_auth_type = gensec_gssapi_final_auth_type,
1670         .enabled        = true,
1671         .kerberos       = true,
1672         .priority       = GENSEC_GSSAPI
1673 };
1674
1675 /* As a server, this could in theory accept any GSSAPI mech */
1676 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1677         .name             = "gssapi_krb5_sasl",
1678         .sasl_name        = "GSSAPI",
1679         .client_start     = gensec_gssapi_sasl_client_start,
1680         .server_start     = gensec_gssapi_sasl_server_start,
1681         .update_send      = gensec_gssapi_update_send,
1682         .update_recv      = gensec_gssapi_update_recv,
1683         .session_key      = gensec_gssapi_session_key,
1684         .session_info     = gensec_gssapi_session_info,
1685         .max_input_size   = gensec_gssapi_max_input_size,
1686         .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1687         .wrap             = gensec_gssapi_wrap,
1688         .unwrap           = gensec_gssapi_unwrap,
1689         .have_feature     = gensec_gssapi_have_feature,
1690         .expire_time      = gensec_gssapi_expire_time,
1691         .final_auth_type = gensec_gssapi_final_auth_type,
1692         .enabled          = true,
1693         .kerberos         = true,
1694         .priority         = GENSEC_GSSAPI
1695 };
1696
1697 _PUBLIC_ NTSTATUS gensec_gssapi_init(TALLOC_CTX *ctx)
1698 {
1699         NTSTATUS ret;
1700
1701         ret = gensec_register(ctx, &gensec_gssapi_spnego_security_ops);
1702         if (!NT_STATUS_IS_OK(ret)) {
1703                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1704                         gensec_gssapi_spnego_security_ops.name));
1705                 return ret;
1706         }
1707
1708         ret = gensec_register(ctx, &gensec_gssapi_krb5_security_ops);
1709         if (!NT_STATUS_IS_OK(ret)) {
1710                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1711                         gensec_gssapi_krb5_security_ops.name));
1712                 return ret;
1713         }
1714
1715         ret = gensec_register(ctx, &gensec_gssapi_sasl_krb5_security_ops);
1716         if (!NT_STATUS_IS_OK(ret)) {
1717                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1718                         gensec_gssapi_sasl_krb5_security_ops.name));
1719                 return ret;
1720         }
1721
1722         return ret;
1723 }