source4/cldap_server/netlogon.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    CLDAP server - netlogon handling
   5
   6    Copyright (C) Andrew Tridgell        2005
   7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2008
   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    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include <ldb.h>
  25 #include <ldb_errors.h>
  26 #include "lib/events/events.h"
  27 #include "smbd/service_task.h"
  28 #include "cldap_server/cldap_server.h"
  29 #include "librpc/gen_ndr/ndr_misc.h"
  30 #include "libcli/ldap/ldap_ndr.h"
  31 #include "libcli/security/security.h"
  32 #include "dsdb/samdb/samdb.h"
  33 #include "auth/auth.h"
  34 #include "ldb_wrap.h"
  35 #include "system/network.h"
  36 #include "lib/socket/netif.h"
  37 #include "param/param.h"
  38 #include "../lib/tsocket/tsocket.h"
  39 #include "libds/common/flag_mapping.h"
  40
  41 /*
  42   fill in the cldap netlogon union for a given version
  43 */
  44 NTSTATUS fill_netlogon_samlogon_response(struct ldb_context *sam_ctx,
  45                                          TALLOC_CTX *mem_ctx,
  46                                          const char *domain,
  47                                          const char *netbios_domain,
  48                                          struct dom_sid *domain_sid,
  49                                          const char *domain_guid,
  50                                          const char *user,
  51                                          uint32_t acct_control,
  52                                          const char *src_address,
  53                                          uint32_t version,
  54                                          struct loadparm_context *lp_ctx,
  55                                          struct netlogon_samlogon_response *netlogon,
  56                                          bool fill_on_blank_request)
  57 {
  58         const char *dom_attrs[] = {"objectGUID", NULL};
  59         const char *none_attrs[] = {NULL};
  60         struct ldb_result *dom_res = NULL, *user_res = NULL;
  61         int ret;
  62         const char **services = lpcfg_server_services(lp_ctx);
  63         uint32_t server_type;
  64         const char *pdc_name;
  65         struct GUID domain_uuid;
  66         const char *dns_domain;
  67         const char *forest_domain;
  68         const char *pdc_dns_name;
  69         const char *flatname;
  70         const char *server_site;
  71         const char *client_site;
  72         const char *pdc_ip;
  73         struct ldb_dn *domain_dn = NULL;
  74         struct interface *ifaces;
  75         bool user_known, am_rodc;
  76         NTSTATUS status;
  77
  78         /* the domain parameter could have an optional trailing "." */
  79         if (domain && domain[strlen(domain)-1] == '.') {
  80                 domain = talloc_strndup(mem_ctx, domain, strlen(domain)-1);
  81                 NT_STATUS_HAVE_NO_MEMORY(domain);
  82         }
  83
  84         /* Lookup using long or short domainname */
  85         if (domain && (strcasecmp_m(domain, lpcfg_dnsdomain(lp_ctx)) == 0)) {
  86                 domain_dn = ldb_get_default_basedn(sam_ctx);
  87         }
  88         if (netbios_domain && (strcasecmp_m(netbios_domain, lpcfg_sam_name(lp_ctx)) == 0)) {
  89                 domain_dn = ldb_get_default_basedn(sam_ctx);
  90         }
  91         if (domain_dn) {
  92                 const char *domain_identifier = domain != NULL ? domain
  93                                                         : netbios_domain;
  94                 ret = ldb_search(sam_ctx, mem_ctx, &dom_res,
  95                                  domain_dn, LDB_SCOPE_BASE, dom_attrs,
  96                                  "objectClass=domain");
  97                 if (ret != LDB_SUCCESS) {
  98                         DEBUG(2,("Error finding domain '%s'/'%s' in sam: %s\n",
  99                                  domain_identifier,
 100                                  ldb_dn_get_linearized(domain_dn),
 101                                  ldb_errstring(sam_ctx)));
 102                         return NT_STATUS_NO_SUCH_DOMAIN;
 103                 }
 104                 if (dom_res->count != 1) {
 105                         DEBUG(2,("Error finding domain '%s'/'%s' in sam\n",
 106                                  domain_identifier,
 107                                  ldb_dn_get_linearized(domain_dn)));
 108                         return NT_STATUS_NO_SUCH_DOMAIN;
 109                 }
 110         }
 111
 112         /* Lookup using GUID or SID */
 113         if ((dom_res == NULL) && (domain_guid || domain_sid)) {
 114                 if (domain_guid) {
 115                         struct GUID binary_guid;
 116                         struct ldb_val guid_val;
 117
 118                         /* By this means, we ensure we don't have funny stuff in the GUID */
 119
 120                         status = GUID_from_string(domain_guid, &binary_guid);
 121                         if (!NT_STATUS_IS_OK(status)) {
 122                                 return status;
 123                         }
 124
 125                         /* And this gets the result into the binary format we want anyway */
 126                         status = GUID_to_ndr_blob(&binary_guid, mem_ctx, &guid_val);
 127                         if (!NT_STATUS_IS_OK(status)) {
 128                                 return status;
 129                         }
 130                         ret = ldb_search(sam_ctx, mem_ctx, &dom_res,
 131                                                  NULL, LDB_SCOPE_SUBTREE,
 132                                                  dom_attrs,
 133                                                  "(&(objectCategory=DomainDNS)(objectGUID=%s))",
 134                                                  ldb_binary_encode(mem_ctx, guid_val));
 135                 } else { /* domain_sid case */
 136                         struct dom_sid *sid;
 137                         struct ldb_val sid_val;
 138                         enum ndr_err_code ndr_err;
 139
 140                         /* Rather than go via the string, just push into the NDR form */
 141                         ndr_err = ndr_push_struct_blob(&sid_val, mem_ctx, &sid,
 142                                                        (ndr_push_flags_fn_t)ndr_push_dom_sid);
 143                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 144                                 return NT_STATUS_INVALID_PARAMETER;
 145                         }
 146
 147                         ret = ldb_search(sam_ctx, mem_ctx, &dom_res,
 148                                                  NULL, LDB_SCOPE_SUBTREE,
 149                                                  dom_attrs,
 150                                                  "(&(objectCategory=DomainDNS)(objectSid=%s))",
 151                                                  ldb_binary_encode(mem_ctx, sid_val));
 152                 }
 153
 154                 if (ret != LDB_SUCCESS) {
 155                         DEBUG(2,("Unable to find a correct reference to GUID '%s' or SID '%s' in sam: %s\n",
 156                                  domain_guid, dom_sid_string(mem_ctx, domain_sid),
 157                                  ldb_errstring(sam_ctx)));
 158                         return NT_STATUS_NO_SUCH_DOMAIN;
 159                 } else if (dom_res->count == 1) {
 160                         /* Ok, now just check it is our domain */
 161                         if (ldb_dn_compare(ldb_get_default_basedn(sam_ctx),
 162                                            dom_res->msgs[0]->dn) != 0) {
 163                                 DEBUG(2,("The GUID '%s' or SID '%s' doesn't identify our domain\n",
 164                                          domain_guid,
 165                                          dom_sid_string(mem_ctx, domain_sid)));
 166                                 return NT_STATUS_NO_SUCH_DOMAIN;
 167                         }
 168                 } else {
 169                         DEBUG(2,("Unable to find a correct reference to GUID '%s' or SID '%s' in sam\n",
 170                                  domain_guid, dom_sid_string(mem_ctx, domain_sid)));
 171                         return NT_STATUS_NO_SUCH_DOMAIN;
 172                 }
 173         }
 174
 175         if (dom_res == NULL && fill_on_blank_request) {
 176                 /* blank inputs gives our domain - tested against
 177                    w2k8r2. Without this ADUC on Win7 won't start */
 178                 domain_dn = ldb_get_default_basedn(sam_ctx);
 179                 ret = ldb_search(sam_ctx, mem_ctx, &dom_res,
 180                                  domain_dn, LDB_SCOPE_BASE, dom_attrs,
 181                                  "objectClass=domain");
 182                 if (ret != LDB_SUCCESS) {
 183                         DEBUG(2,("Error finding domain '%s'/'%s' in sam: %s\n",
 184                                  lpcfg_dnsdomain(lp_ctx),
 185                                  ldb_dn_get_linearized(domain_dn),
 186                                  ldb_errstring(sam_ctx)));
 187                         return NT_STATUS_NO_SUCH_DOMAIN;
 188                 }
 189         }
 190
 191         if (dom_res == NULL) {
 192                 DEBUG(2,(__location__ ": Unable to get domain information with no inputs\n"));
 193                 return NT_STATUS_NO_SUCH_DOMAIN;
 194         }
 195
 196         /* work around different inputs for not-specified users */
 197         if (!user) {
 198                 user = "";
 199         }
 200
 201         /* Enquire about any valid username with just a CLDAP packet -
 202          * if kerberos didn't also do this, the security folks would
 203          * scream... */
 204         if (user[0]) {                                                  \
 205                 /* Only allow some bits to be enquired:  [MS-ATDS] 7.3.3.2 */
 206                 if (acct_control == (uint32_t)-1) {
 207                         acct_control = 0;
 208                 }
 209                 acct_control = acct_control & (ACB_TEMPDUP | ACB_NORMAL | ACB_DOMTRUST | ACB_WSTRUST | ACB_SVRTRUST);
 210
 211                 /* We must exclude disabled accounts, but otherwise do the bitwise match the client asked for */
 212                 ret = ldb_search(sam_ctx, mem_ctx, &user_res,
 213                                          dom_res->msgs[0]->dn, LDB_SCOPE_SUBTREE,
 214                                          none_attrs,
 215                                          "(&(objectClass=user)(samAccountName=%s)"
 216                                          "(!(userAccountControl:" LDB_OID_COMPARATOR_AND ":=%u))"
 217                                          "(userAccountControl:" LDB_OID_COMPARATOR_OR ":=%u))",
 218                                          ldb_binary_encode_string(mem_ctx, user),
 219                                          UF_ACCOUNTDISABLE, ds_acb2uf(acct_control));
 220                 if (ret != LDB_SUCCESS) {
 221                         DEBUG(2,("Unable to find reference to user '%s' with ACB 0x%8x under %s: %s\n",
 222                                  user, acct_control, ldb_dn_get_linearized(dom_res->msgs[0]->dn),
 223                                  ldb_errstring(sam_ctx)));
 224                         return NT_STATUS_NO_SUCH_USER;
 225                 } else if (user_res->count == 1) {
 226                         user_known = true;
 227                 } else {
 228                         user_known = false;
 229                 }
 230
 231         } else {
 232                 user_known = true;
 233         }
 234
 235         server_type      =
 236                 DS_SERVER_DS | DS_SERVER_TIMESERV |
 237                 DS_SERVER_CLOSEST |
 238                 DS_SERVER_GOOD_TIMESERV;
 239
 240 #if 0
 241         /* w2k8-r2 as a DC does not claim these */
 242         server_type |= DS_DNS_CONTROLLER | DS_DNS_DOMAIN;
 243 #endif
 244
 245         if (samdb_is_pdc(sam_ctx)) {
 246                 server_type |= DS_SERVER_PDC;
 247         }
 248
 249         if (dsdb_functional_level(sam_ctx) >= DS_DOMAIN_FUNCTION_2008) {
 250                 server_type |= DS_SERVER_FULL_SECRET_DOMAIN_6;
 251         }
 252
 253         if (samdb_is_gc(sam_ctx)) {
 254                 server_type |= DS_SERVER_GC;
 255         }
 256
 257         if (str_list_check(services, "ldap")) {
 258                 server_type |= DS_SERVER_LDAP;
 259         }
 260
 261         if (str_list_check(services, "kdc")) {
 262                 server_type |= DS_SERVER_KDC;
 263         }
 264
 265         if (samdb_rodc(sam_ctx, &am_rodc) == LDB_SUCCESS && !am_rodc) {
 266                 server_type |= DS_SERVER_WRITABLE;
 267         }
 268
 269 #if 0
 270         /* w2k8-r2 as a sole DC does not claim this */
 271         if (ldb_dn_compare(ldb_get_root_basedn(sam_ctx), ldb_get_default_basedn(sam_ctx)) == 0) {
 272                 server_type |= DS_DNS_FOREST_ROOT;
 273         }
 274 #endif
 275
 276         pdc_name         = talloc_asprintf(mem_ctx, "\\\\%s",
 277                                            lpcfg_netbios_name(lp_ctx));
 278         NT_STATUS_HAVE_NO_MEMORY(pdc_name);
 279         domain_uuid      = samdb_result_guid(dom_res->msgs[0], "objectGUID");
 280         dns_domain       = lpcfg_dnsdomain(lp_ctx);
 281         forest_domain    = samdb_forest_name(sam_ctx, mem_ctx);
 282         NT_STATUS_HAVE_NO_MEMORY(forest_domain);
 283         pdc_dns_name     = talloc_asprintf(mem_ctx, "%s.%s",
 284                                            strlower_talloc(mem_ctx,
 285                                                            lpcfg_netbios_name(lp_ctx)),
 286                                            dns_domain);
 287         NT_STATUS_HAVE_NO_MEMORY(pdc_dns_name);
 288         flatname         = lpcfg_workgroup(lp_ctx);
 289         server_site      = samdb_server_site_name(sam_ctx, mem_ctx);
 290         NT_STATUS_HAVE_NO_MEMORY(server_site);
 291         client_site      = samdb_client_site_name(sam_ctx, mem_ctx,
 292                                                   src_address, NULL);
 293         NT_STATUS_HAVE_NO_MEMORY(client_site);
 294         load_interfaces(mem_ctx, lpcfg_interfaces(lp_ctx), &ifaces);
 295         /*
 296          * TODO: the caller should pass the address which the client
 297          * used to trigger this call, as the client is able to reach
 298          * this ip.
 299          */
 300         if (src_address) {
 301                 pdc_ip = iface_best_ip(ifaces, src_address);
 302         } else {
 303                 pdc_ip = iface_n_ip(ifaces, 0);
 304         }
 305         ZERO_STRUCTP(netlogon);
 306
 307         /* check if either of these bits is present */
 308         if (version & (NETLOGON_NT_VERSION_5EX|NETLOGON_NT_VERSION_5EX_WITH_IP)) {
 309                 uint32_t extra_flags = 0;
 310                 netlogon->ntver = NETLOGON_NT_VERSION_5EX;
 311
 312                 /* could check if the user exists */
 313                 if (user_known) {
 314                         netlogon->data.nt5_ex.command      = LOGON_SAM_LOGON_RESPONSE_EX;
 315                 } else {
 316                         netlogon->data.nt5_ex.command      = LOGON_SAM_LOGON_USER_UNKNOWN_EX;
 317                 }
 318                 netlogon->data.nt5_ex.pdc_name     = pdc_name;
 319                 netlogon->data.nt5_ex.user_name    = user;
 320                 netlogon->data.nt5_ex.domain_name  = flatname;
 321                 netlogon->data.nt5_ex.domain_uuid  = domain_uuid;
 322                 netlogon->data.nt5_ex.forest       = forest_domain;
 323                 netlogon->data.nt5_ex.dns_domain   = dns_domain;
 324                 netlogon->data.nt5_ex.pdc_dns_name = pdc_dns_name;
 325                 netlogon->data.nt5_ex.server_site  = server_site;
 326                 netlogon->data.nt5_ex.client_site  = client_site;
 327                 if (version & NETLOGON_NT_VERSION_5EX_WITH_IP) {
 328                         /* Clearly this needs to be fixed up for IPv6 */
 329                         extra_flags = NETLOGON_NT_VERSION_5EX_WITH_IP;
 330                         netlogon->data.nt5_ex.sockaddr.sockaddr_family    = 2;
 331                         netlogon->data.nt5_ex.sockaddr.pdc_ip       = pdc_ip;
 332                         netlogon->data.nt5_ex.sockaddr.remaining = data_blob_talloc_zero(mem_ctx, 8);
 333                 }
 334                 netlogon->data.nt5_ex.server_type  = server_type;
 335                 netlogon->data.nt5_ex.nt_version   = NETLOGON_NT_VERSION_1|NETLOGON_NT_VERSION_5EX|extra_flags;
 336                 netlogon->data.nt5_ex.lmnt_token   = 0xFFFF;
 337                 netlogon->data.nt5_ex.lm20_token   = 0xFFFF;
 338
 339         } else if (version & NETLOGON_NT_VERSION_5) {
 340                 netlogon->ntver = NETLOGON_NT_VERSION_5;
 341
 342                 /* could check if the user exists */
 343                 if (user_known) {
 344                         netlogon->data.nt5.command      = LOGON_SAM_LOGON_RESPONSE;
 345                 } else {
 346                         netlogon->data.nt5.command      = LOGON_SAM_LOGON_USER_UNKNOWN;
 347                 }
 348                 netlogon->data.nt5.pdc_name     = pdc_name;
 349                 netlogon->data.nt5.user_name    = user;
 350                 netlogon->data.nt5.domain_name  = flatname;
 351                 netlogon->data.nt5.domain_uuid  = domain_uuid;
 352                 netlogon->data.nt5.forest       = forest_domain;
 353                 netlogon->data.nt5.dns_domain   = dns_domain;
 354                 netlogon->data.nt5.pdc_dns_name = pdc_dns_name;
 355                 netlogon->data.nt5.pdc_ip       = pdc_ip;
 356                 netlogon->data.nt5.server_type  = server_type;
 357                 netlogon->data.nt5.nt_version   = NETLOGON_NT_VERSION_1|NETLOGON_NT_VERSION_5;
 358                 netlogon->data.nt5.lmnt_token   = 0xFFFF;
 359                 netlogon->data.nt5.lm20_token   = 0xFFFF;
 360
 361         } else /* (version & NETLOGON_NT_VERSION_1) and all other cases */ {
 362                 netlogon->ntver = NETLOGON_NT_VERSION_1;
 363                 /* could check if the user exists */
 364                 if (user_known) {
 365                         netlogon->data.nt4.command      = LOGON_SAM_LOGON_RESPONSE;
 366                 } else {
 367                         netlogon->data.nt4.command      = LOGON_SAM_LOGON_USER_UNKNOWN;
 368                 }
 369                 netlogon->data.nt4.pdc_name    = pdc_name;
 370                 netlogon->data.nt4.user_name   = user;
 371                 netlogon->data.nt4.domain_name = flatname;
 372                 netlogon->data.nt4.nt_version  = NETLOGON_NT_VERSION_1;
 373                 netlogon->data.nt4.lmnt_token  = 0xFFFF;
 374                 netlogon->data.nt4.lm20_token  = 0xFFFF;
 375         }
 376
 377         return NT_STATUS_OK;
 378 }
 379
 380
 381 /*
 382   handle incoming cldap requests
 383 */
 384 void cldapd_netlogon_request(struct cldap_socket *cldap,
 385                              struct cldapd_server *cldapd,
 386                              TALLOC_CTX *tmp_ctx,
 387                              uint32_t message_id,
 388                              struct ldb_parse_tree *tree,
 389                              struct tsocket_address *src)
 390 {
 391         unsigned int i;
 392         const char *domain = NULL;
 393         const char *host = NULL;
 394         const char *user = NULL;
 395         const char *domain_guid = NULL;
 396         struct dom_sid *domain_sid = NULL;
 397         int acct_control = -1;
 398         int version = -1;
 399         struct netlogon_samlogon_response netlogon;
 400         NTSTATUS status = NT_STATUS_INVALID_PARAMETER;
 401
 402         if (tree->operation != LDB_OP_AND) goto failed;
 403
 404         /* extract the query elements */
 405         for (i=0;i<tree->u.list.num_elements;i++) {
 406                 struct ldb_parse_tree *t = tree->u.list.elements[i];
 407                 if (t->operation != LDB_OP_EQUALITY) goto failed;
 408                 if (strcasecmp(t->u.equality.attr, "DnsDomain") == 0) {
 409                         domain = talloc_strndup(tmp_ctx,
 410                                                 (const char *)t->u.equality.value.data,
 411                                                 t->u.equality.value.length);
 412                 }
 413                 if (strcasecmp(t->u.equality.attr, "Host") == 0) {
 414                         host = talloc_strndup(tmp_ctx,
 415                                               (const char *)t->u.equality.value.data,
 416                                               t->u.equality.value.length);
 417                 }
 418                 if (strcasecmp(t->u.equality.attr, "DomainGuid") == 0) {
 419                         NTSTATUS enc_status;
 420                         struct GUID guid;
 421                         enc_status = ldap_decode_ndr_GUID(tmp_ctx,
 422                                                           t->u.equality.value, &guid);
 423                         if (NT_STATUS_IS_OK(enc_status)) {
 424                                 domain_guid = GUID_string(tmp_ctx, &guid);
 425                         }
 426                 }
 427                 if (strcasecmp(t->u.equality.attr, "DomainSid") == 0) {
 428                         enum ndr_err_code ndr_err;
 429
 430                         domain_sid = talloc(tmp_ctx, struct dom_sid);
 431                         if (domain_sid == NULL) {
 432                                 goto failed;
 433                         }
 434                         ndr_err = ndr_pull_struct_blob(&t->u.equality.value,
 435                                                        domain_sid, domain_sid,
 436                                                        (ndr_pull_flags_fn_t)ndr_pull_dom_sid);
 437                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 438                                 talloc_free(domain_sid);
 439                                 goto failed;
 440                         }
 441                 }
 442                 if (strcasecmp(t->u.equality.attr, "User") == 0) {
 443                         user = talloc_strndup(tmp_ctx,
 444                                               (const char *)t->u.equality.value.data,
 445                                               t->u.equality.value.length);
 446                 }
 447                 if (strcasecmp(t->u.equality.attr, "NtVer") == 0 &&
 448                     t->u.equality.value.length == 4) {
 449                         version = IVAL(t->u.equality.value.data, 0);
 450                 }
 451                 if (strcasecmp(t->u.equality.attr, "AAC") == 0 &&
 452                     t->u.equality.value.length == 4) {
 453                         acct_control = IVAL(t->u.equality.value.data, 0);
 454                 }
 455         }
 456
 457         if ((domain == NULL) && (domain_guid == NULL) && (domain_sid == NULL)) {
 458                 domain = lpcfg_dnsdomain(cldapd->task->lp_ctx);
 459         }
 460
 461         if (version == -1) {
 462                 goto failed;
 463         }
 464
 465         DEBUG(5,("cldap netlogon query domain=%s host=%s user=%s version=%d guid=%s\n",
 466                  domain, host, user, version, domain_guid));
 467
 468         status = fill_netlogon_samlogon_response(cldapd->samctx, tmp_ctx,
 469                                                  domain, NULL, domain_sid,
 470                                                  domain_guid,
 471                                                  user, acct_control,
 472                                                  tsocket_address_inet_addr_string(src, tmp_ctx),
 473                                                  version, cldapd->task->lp_ctx,
 474                                                  &netlogon, false);
 475         if (!NT_STATUS_IS_OK(status)) {
 476                 goto failed;
 477         }
 478
 479         status = cldap_netlogon_reply(cldap, message_id, src, version, &netlogon);
 480         if (!NT_STATUS_IS_OK(status)) {
 481                 goto failed;
 482         }
 483
 484         return;
 485
 486 failed:
 487         DEBUG(2,("cldap netlogon query failed domain=%s host=%s version=%d - %s\n",
 488                  domain, host, version, nt_errstr(status)));
 489         cldap_empty_reply(cldap, message_id, src);
 490 }