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 #include "lib/util/util_net.h"
  41
  42 /*
  43   fill in the cldap netlogon union for a given version
  44 */
  45 NTSTATUS fill_netlogon_samlogon_response(struct ldb_context *sam_ctx,
  46                                          TALLOC_CTX *mem_ctx,
  47                                          const char *domain,
  48                                          const char *netbios_domain,
  49                                          struct dom_sid *domain_sid,
  50                                          const char *domain_guid,
  51                                          const char *user,
  52                                          uint32_t acct_control,
  53                                          const char *src_address,
  54                                          uint32_t version,
  55                                          struct loadparm_context *lp_ctx,
  56                                          struct netlogon_samlogon_response *netlogon,
  57                                          bool fill_on_blank_request)
  58 {
  59         const char *dom_attrs[] = {"objectGUID", NULL};
  60         const char *none_attrs[] = {NULL};
  61         struct ldb_result *dom_res = NULL, *user_res = NULL;
  62         int ret;
  63         const char **services = lpcfg_server_services(lp_ctx);
  64         uint32_t server_type;
  65         const char *pdc_name;
  66         struct GUID domain_uuid;
  67         const char *dns_domain;
  68         const char *forest_domain;
  69         const char *pdc_dns_name;
  70         const char *flatname;
  71         const char *server_site;
  72         const char *client_site;
  73         const char *pdc_ip;
  74         struct ldb_dn *domain_dn = NULL;
  75         struct interface *ifaces;
  76         bool user_known, am_rodc;
  77         NTSTATUS status;
  78
  79         /* the domain parameter could have an optional trailing "." */
  80         if (domain && domain[strlen(domain)-1] == '.') {
  81                 domain = talloc_strndup(mem_ctx, domain, strlen(domain)-1);
  82                 NT_STATUS_HAVE_NO_MEMORY(domain);
  83         }
  84
  85         /* Lookup using long or short domainname */
  86         if (domain && (strcasecmp_m(domain, lpcfg_dnsdomain(lp_ctx)) == 0)) {
  87                 domain_dn = ldb_get_default_basedn(sam_ctx);
  88         }
  89         if (netbios_domain && (strcasecmp_m(netbios_domain, lpcfg_sam_name(lp_ctx)) == 0)) {
  90                 domain_dn = ldb_get_default_basedn(sam_ctx);
  91         }
  92         if (domain_dn) {
  93                 const char *domain_identifier = domain != NULL ? domain
  94                                                         : netbios_domain;
  95                 ret = ldb_search(sam_ctx, mem_ctx, &dom_res,
  96                                  domain_dn, LDB_SCOPE_BASE, dom_attrs,
  97                                  "objectClass=domain");
  98                 if (ret != LDB_SUCCESS) {
  99                         DEBUG(2,("Error finding domain '%s'/'%s' in sam: %s\n",
 100                                  domain_identifier,
 101                                  ldb_dn_get_linearized(domain_dn),
 102                                  ldb_errstring(sam_ctx)));
 103                         return NT_STATUS_NO_SUCH_DOMAIN;
 104                 }
 105                 if (dom_res->count != 1) {
 106                         DEBUG(2,("Error finding domain '%s'/'%s' in sam\n",
 107                                  domain_identifier,
 108                                  ldb_dn_get_linearized(domain_dn)));
 109                         return NT_STATUS_NO_SUCH_DOMAIN;
 110                 }
 111         }
 112
 113         /* Lookup using GUID or SID */
 114         if ((dom_res == NULL) && (domain_guid || domain_sid)) {
 115                 if (domain_guid) {
 116                         struct GUID binary_guid;
 117                         struct ldb_val guid_val;
 118
 119                         /* By this means, we ensure we don't have funny stuff in the GUID */
 120
 121                         status = GUID_from_string(domain_guid, &binary_guid);
 122                         if (!NT_STATUS_IS_OK(status)) {
 123                                 return status;
 124                         }
 125
 126                         /* And this gets the result into the binary format we want anyway */
 127                         status = GUID_to_ndr_blob(&binary_guid, mem_ctx, &guid_val);
 128                         if (!NT_STATUS_IS_OK(status)) {
 129                                 return status;
 130                         }
 131                         ret = ldb_search(sam_ctx, mem_ctx, &dom_res,
 132                                                  NULL, LDB_SCOPE_SUBTREE,
 133                                                  dom_attrs,
 134                                                  "(&(objectCategory=DomainDNS)(objectGUID=%s))",
 135                                                  ldb_binary_encode(mem_ctx, guid_val));
 136                 } else { /* domain_sid case */
 137                         ret = ldb_search(sam_ctx, mem_ctx, &dom_res,
 138                                          NULL, LDB_SCOPE_SUBTREE,
 139                                          dom_attrs,
 140                                          "(&(objectCategory=DomainDNS)(objectSid=%s))",
 141                                          dom_sid_string(mem_ctx, domain_sid));
 142                 }
 143
 144                 if (ret != LDB_SUCCESS) {
 145                         DEBUG(2,("Unable to find a correct reference to GUID '%s' or SID '%s' in sam: %s\n",
 146                                  domain_guid, dom_sid_string(mem_ctx, domain_sid),
 147                                  ldb_errstring(sam_ctx)));
 148                         return NT_STATUS_NO_SUCH_DOMAIN;
 149                 } else if (dom_res->count == 1) {
 150                         /* Ok, now just check it is our domain */
 151                         if (ldb_dn_compare(ldb_get_default_basedn(sam_ctx),
 152                                            dom_res->msgs[0]->dn) != 0) {
 153                                 DEBUG(2,("The GUID '%s' or SID '%s' doesn't identify our domain\n",
 154                                          domain_guid,
 155                                          dom_sid_string(mem_ctx, domain_sid)));
 156                                 return NT_STATUS_NO_SUCH_DOMAIN;
 157                         }
 158                 } else {
 159                         DEBUG(2,("Unable to find a correct reference to GUID '%s' or SID '%s' in sam\n",
 160                                  domain_guid, dom_sid_string(mem_ctx, domain_sid)));
 161                         return NT_STATUS_NO_SUCH_DOMAIN;
 162                 }
 163         }
 164
 165         if (dom_res == NULL && fill_on_blank_request) {
 166                 /* blank inputs gives our domain - tested against
 167                    w2k8r2. Without this ADUC on Win7 won't start */
 168                 domain_dn = ldb_get_default_basedn(sam_ctx);
 169                 ret = ldb_search(sam_ctx, mem_ctx, &dom_res,
 170                                  domain_dn, LDB_SCOPE_BASE, dom_attrs,
 171                                  "objectClass=domain");
 172                 if (ret != LDB_SUCCESS) {
 173                         DEBUG(2,("Error finding domain '%s'/'%s' in sam: %s\n",
 174                                  lpcfg_dnsdomain(lp_ctx),
 175                                  ldb_dn_get_linearized(domain_dn),
 176                                  ldb_errstring(sam_ctx)));
 177                         return NT_STATUS_NO_SUCH_DOMAIN;
 178                 }
 179         }
 180
 181         if (dom_res == NULL) {
 182                 DEBUG(2,(__location__ ": Unable to get domain information with no inputs\n"));
 183                 return NT_STATUS_NO_SUCH_DOMAIN;
 184         }
 185
 186         /* work around different inputs for not-specified users */
 187         if (!user) {
 188                 user = "";
 189         }
 190
 191         /* Enquire about any valid username with just a CLDAP packet -
 192          * if kerberos didn't also do this, the security folks would
 193          * scream... */
 194         if (user[0]) {                                                  \
 195                 /* Only allow some bits to be enquired:  [MS-ATDS] 7.3.3.2 */
 196                 if (acct_control == (uint32_t)-1) {
 197                         acct_control = 0;
 198                 }
 199                 acct_control = acct_control & (ACB_TEMPDUP | ACB_NORMAL | ACB_DOMTRUST | ACB_WSTRUST | ACB_SVRTRUST);
 200
 201                 /* We must exclude disabled accounts, but otherwise do the bitwise match the client asked for */
 202                 ret = ldb_search(sam_ctx, mem_ctx, &user_res,
 203                                          dom_res->msgs[0]->dn, LDB_SCOPE_SUBTREE,
 204                                          none_attrs,
 205                                          "(&(objectClass=user)(samAccountName=%s)"
 206                                          "(!(userAccountControl:" LDB_OID_COMPARATOR_AND ":=%u))"
 207                                          "(userAccountControl:" LDB_OID_COMPARATOR_OR ":=%u))",
 208                                          ldb_binary_encode_string(mem_ctx, user),
 209                                          UF_ACCOUNTDISABLE, ds_acb2uf(acct_control));
 210                 if (ret != LDB_SUCCESS) {
 211                         DEBUG(2,("Unable to find reference to user '%s' with ACB 0x%8x under %s: %s\n",
 212                                  user, acct_control, ldb_dn_get_linearized(dom_res->msgs[0]->dn),
 213                                  ldb_errstring(sam_ctx)));
 214                         return NT_STATUS_NO_SUCH_USER;
 215                 } else if (user_res->count == 1) {
 216                         user_known = true;
 217                 } else {
 218                         user_known = false;
 219                 }
 220
 221         } else {
 222                 user_known = true;
 223         }
 224
 225         server_type      =
 226                 DS_SERVER_DS | DS_SERVER_TIMESERV |
 227                 DS_SERVER_GOOD_TIMESERV;
 228
 229         if (samdb_is_pdc(sam_ctx)) {
 230                 server_type |= DS_SERVER_PDC;
 231         }
 232
 233         if (dsdb_functional_level(sam_ctx) >= DS_DOMAIN_FUNCTION_2008) {
 234                 server_type |= DS_SERVER_FULL_SECRET_DOMAIN_6;
 235         }
 236
 237         if (samdb_is_gc(sam_ctx)) {
 238                 server_type |= DS_SERVER_GC;
 239         }
 240
 241         if (str_list_check(services, "ldap")) {
 242                 server_type |= DS_SERVER_LDAP;
 243         }
 244
 245         if (str_list_check(services, "kdc")) {
 246                 server_type |= DS_SERVER_KDC;
 247         }
 248
 249         if (samdb_rodc(sam_ctx, &am_rodc) == LDB_SUCCESS && !am_rodc) {
 250                 server_type |= DS_SERVER_WRITABLE;
 251         }
 252
 253         pdc_name         = talloc_asprintf(mem_ctx, "\\\\%s",
 254                                            lpcfg_netbios_name(lp_ctx));
 255         NT_STATUS_HAVE_NO_MEMORY(pdc_name);
 256         domain_uuid      = samdb_result_guid(dom_res->msgs[0], "objectGUID");
 257         dns_domain       = lpcfg_dnsdomain(lp_ctx);
 258         forest_domain    = samdb_forest_name(sam_ctx, mem_ctx);
 259         NT_STATUS_HAVE_NO_MEMORY(forest_domain);
 260         pdc_dns_name     = talloc_asprintf(mem_ctx, "%s.%s",
 261                                            strlower_talloc(mem_ctx,
 262                                                            lpcfg_netbios_name(lp_ctx)),
 263                                            dns_domain);
 264         NT_STATUS_HAVE_NO_MEMORY(pdc_dns_name);
 265         flatname         = lpcfg_workgroup(lp_ctx);
 266
 267         server_site      = samdb_server_site_name(sam_ctx, mem_ctx);
 268         NT_STATUS_HAVE_NO_MEMORY(server_site);
 269         client_site      = samdb_client_site_name(sam_ctx, mem_ctx,
 270                                                   src_address, NULL);
 271         NT_STATUS_HAVE_NO_MEMORY(client_site);
 272         if (strcasecmp(server_site, client_site) == 0) {
 273                 server_type |= DS_SERVER_CLOSEST;
 274         }
 275
 276         load_interface_list(mem_ctx, lp_ctx, &ifaces);
 277         if (src_address) {
 278                 pdc_ip = iface_list_best_ip(ifaces, src_address);
 279         } else {
 280                 pdc_ip = iface_list_first_v4(ifaces);
 281         }
 282         if (pdc_ip == NULL || !is_ipaddress_v4(pdc_ip)) {
 283                 /* this matches windows behaviour */
 284                 pdc_ip = "127.0.0.1";
 285         }
 286
 287         ZERO_STRUCTP(netlogon);
 288
 289         /* check if either of these bits is present */
 290         if (version & (NETLOGON_NT_VERSION_5EX|NETLOGON_NT_VERSION_5EX_WITH_IP)) {
 291                 uint32_t extra_flags = 0;
 292                 netlogon->ntver = NETLOGON_NT_VERSION_5EX;
 293
 294                 /* could check if the user exists */
 295                 if (user_known) {
 296                         netlogon->data.nt5_ex.command      = LOGON_SAM_LOGON_RESPONSE_EX;
 297                 } else {
 298                         netlogon->data.nt5_ex.command      = LOGON_SAM_LOGON_USER_UNKNOWN_EX;
 299                 }
 300                 netlogon->data.nt5_ex.pdc_name     = pdc_name;
 301                 netlogon->data.nt5_ex.user_name    = user;
 302                 netlogon->data.nt5_ex.domain_name  = flatname;
 303                 netlogon->data.nt5_ex.domain_uuid  = domain_uuid;
 304                 netlogon->data.nt5_ex.forest       = forest_domain;
 305                 netlogon->data.nt5_ex.dns_domain   = dns_domain;
 306                 netlogon->data.nt5_ex.pdc_dns_name = pdc_dns_name;
 307                 netlogon->data.nt5_ex.server_site  = server_site;
 308                 netlogon->data.nt5_ex.client_site  = client_site;
 309                 if (version & NETLOGON_NT_VERSION_5EX_WITH_IP) {
 310                         /* note that this is always a IPV4 address */
 311                         extra_flags = NETLOGON_NT_VERSION_5EX_WITH_IP;
 312                         netlogon->data.nt5_ex.sockaddr.sockaddr_family    = 2;
 313                         netlogon->data.nt5_ex.sockaddr.pdc_ip       = pdc_ip;
 314                         netlogon->data.nt5_ex.sockaddr.remaining = data_blob_talloc_zero(mem_ctx, 8);
 315                 }
 316                 netlogon->data.nt5_ex.server_type  = server_type;
 317                 netlogon->data.nt5_ex.nt_version   = NETLOGON_NT_VERSION_1|NETLOGON_NT_VERSION_5EX|extra_flags;
 318                 netlogon->data.nt5_ex.lmnt_token   = 0xFFFF;
 319                 netlogon->data.nt5_ex.lm20_token   = 0xFFFF;
 320
 321         } else if (version & NETLOGON_NT_VERSION_5) {
 322                 netlogon->ntver = NETLOGON_NT_VERSION_5;
 323
 324                 /* could check if the user exists */
 325                 if (user_known) {
 326                         netlogon->data.nt5.command      = LOGON_SAM_LOGON_RESPONSE;
 327                 } else {
 328                         netlogon->data.nt5.command      = LOGON_SAM_LOGON_USER_UNKNOWN;
 329                 }
 330                 netlogon->data.nt5.pdc_name     = pdc_name;
 331                 netlogon->data.nt5.user_name    = user;
 332                 netlogon->data.nt5.domain_name  = flatname;
 333                 netlogon->data.nt5.domain_uuid  = domain_uuid;
 334                 netlogon->data.nt5.forest       = forest_domain;
 335                 netlogon->data.nt5.dns_domain   = dns_domain;
 336                 netlogon->data.nt5.pdc_dns_name = pdc_dns_name;
 337                 netlogon->data.nt5.pdc_ip       = pdc_ip;
 338                 netlogon->data.nt5.server_type  = server_type;
 339                 netlogon->data.nt5.nt_version   = NETLOGON_NT_VERSION_1|NETLOGON_NT_VERSION_5;
 340                 netlogon->data.nt5.lmnt_token   = 0xFFFF;
 341                 netlogon->data.nt5.lm20_token   = 0xFFFF;
 342
 343         } else /* (version & NETLOGON_NT_VERSION_1) and all other cases */ {
 344                 netlogon->ntver = NETLOGON_NT_VERSION_1;
 345                 /* could check if the user exists */
 346                 if (user_known) {
 347                         netlogon->data.nt4.command      = LOGON_SAM_LOGON_RESPONSE;
 348                 } else {
 349                         netlogon->data.nt4.command      = LOGON_SAM_LOGON_USER_UNKNOWN;
 350                 }
 351                 netlogon->data.nt4.pdc_name    = pdc_name;
 352                 netlogon->data.nt4.user_name   = user;
 353                 netlogon->data.nt4.domain_name = flatname;
 354                 netlogon->data.nt4.nt_version  = NETLOGON_NT_VERSION_1;
 355                 netlogon->data.nt4.lmnt_token  = 0xFFFF;
 356                 netlogon->data.nt4.lm20_token  = 0xFFFF;
 357         }
 358
 359         return NT_STATUS_OK;
 360 }
 361
 362
 363 /*
 364   handle incoming cldap requests
 365 */
 366 void cldapd_netlogon_request(struct cldap_socket *cldap,
 367                              struct cldapd_server *cldapd,
 368                              TALLOC_CTX *tmp_ctx,
 369                              uint32_t message_id,
 370                              struct ldb_parse_tree *tree,
 371                              struct tsocket_address *src)
 372 {
 373         unsigned int i;
 374         const char *domain = NULL;
 375         const char *host = NULL;
 376         const char *user = NULL;
 377         const char *domain_guid = NULL;
 378         struct dom_sid *domain_sid = NULL;
 379         int acct_control = -1;
 380         int version = -1;
 381         struct netlogon_samlogon_response netlogon;
 382         NTSTATUS status = NT_STATUS_INVALID_PARAMETER;
 383
 384         if (tree->operation != LDB_OP_AND) goto failed;
 385
 386         /* extract the query elements */
 387         for (i=0;i<tree->u.list.num_elements;i++) {
 388                 struct ldb_parse_tree *t = tree->u.list.elements[i];
 389                 if (t->operation != LDB_OP_EQUALITY) goto failed;
 390                 if (strcasecmp(t->u.equality.attr, "DnsDomain") == 0) {
 391                         domain = talloc_strndup(tmp_ctx,
 392                                                 (const char *)t->u.equality.value.data,
 393                                                 t->u.equality.value.length);
 394                 }
 395                 if (strcasecmp(t->u.equality.attr, "Host") == 0) {
 396                         host = talloc_strndup(tmp_ctx,
 397                                               (const char *)t->u.equality.value.data,
 398                                               t->u.equality.value.length);
 399                 }
 400                 if (strcasecmp(t->u.equality.attr, "DomainGuid") == 0) {
 401                         NTSTATUS enc_status;
 402                         struct GUID guid;
 403                         enc_status = ldap_decode_ndr_GUID(tmp_ctx,
 404                                                           t->u.equality.value, &guid);
 405                         if (NT_STATUS_IS_OK(enc_status)) {
 406                                 domain_guid = GUID_string(tmp_ctx, &guid);
 407                         }
 408                 }
 409                 if (strcasecmp(t->u.equality.attr, "DomainSid") == 0) {
 410                         enum ndr_err_code ndr_err;
 411
 412                         domain_sid = talloc(tmp_ctx, struct dom_sid);
 413                         if (domain_sid == NULL) {
 414                                 goto failed;
 415                         }
 416                         ndr_err = ndr_pull_struct_blob(&t->u.equality.value,
 417                                                        domain_sid, domain_sid,
 418                                                        (ndr_pull_flags_fn_t)ndr_pull_dom_sid);
 419                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 420                                 talloc_free(domain_sid);
 421                                 goto failed;
 422                         }
 423                 }
 424                 if (strcasecmp(t->u.equality.attr, "User") == 0) {
 425                         user = talloc_strndup(tmp_ctx,
 426                                               (const char *)t->u.equality.value.data,
 427                                               t->u.equality.value.length);
 428                 }
 429                 if (strcasecmp(t->u.equality.attr, "NtVer") == 0 &&
 430                     t->u.equality.value.length == 4) {
 431                         version = IVAL(t->u.equality.value.data, 0);
 432                 }
 433                 if (strcasecmp(t->u.equality.attr, "AAC") == 0 &&
 434                     t->u.equality.value.length == 4) {
 435                         acct_control = IVAL(t->u.equality.value.data, 0);
 436                 }
 437         }
 438
 439         if ((domain == NULL) && (domain_guid == NULL) && (domain_sid == NULL)) {
 440                 domain = lpcfg_dnsdomain(cldapd->task->lp_ctx);
 441         }
 442
 443         if (version == -1) {
 444                 goto failed;
 445         }
 446
 447         DEBUG(5,("cldap netlogon query domain=%s host=%s user=%s version=%d guid=%s\n",
 448                  domain, host, user, version, domain_guid));
 449
 450         status = fill_netlogon_samlogon_response(cldapd->samctx, tmp_ctx,
 451                                                  domain, NULL, domain_sid,
 452                                                  domain_guid,
 453                                                  user, acct_control,
 454                                                  tsocket_address_inet_addr_string(src, tmp_ctx),
 455                                                  version, cldapd->task->lp_ctx,
 456                                                  &netlogon, false);
 457         if (!NT_STATUS_IS_OK(status)) {
 458                 goto failed;
 459         }
 460
 461         status = cldap_netlogon_reply(cldap, message_id, src, version, &netlogon);
 462         if (!NT_STATUS_IS_OK(status)) {
 463                 goto failed;
 464         }
 465
 466         return;
 467
 468 failed:
 469         DEBUG(2,("cldap netlogon query failed domain=%s host=%s version=%d - %s\n",
 470                  domain, host, version, nt_errstr(status)));
 471         cldap_empty_reply(cldap, message_id, src);
 472 }