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