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 *realm;
  65         const char *dns_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 has an optional trailing . */
  77         if (domain && domain[strlen(domain)-1] == '.') {
  78                 domain = talloc_strndup(mem_ctx, domain, strlen(domain)-1);
  79         }
  80
  81         if (domain && strcasecmp_m(domain, lp_realm(lp_ctx)) == 0) {
  82                 domain_dn = ldb_get_default_basedn(sam_ctx);
  83         }
  84
  85         if (netbios_domain && strcasecmp_m(domain, lp_sam_name(lp_ctx))) {
  86                 domain_dn = ldb_get_default_basedn(sam_ctx);
  87         }
  88
  89         if (domain_dn) {
  90                 ret = ldb_search(sam_ctx, mem_ctx, &dom_res,
  91                                  domain_dn, LDB_SCOPE_BASE, dom_attrs,
  92                                  "objectClass=domain");
  93                 if (ret != LDB_SUCCESS) {
  94                         DEBUG(2,("Error finding domain '%s'/'%s' in sam: %s\n", domain, ldb_dn_get_linearized(domain_dn), ldb_errstring(sam_ctx)));
  95                         return NT_STATUS_NO_SUCH_DOMAIN;
  96                 }
  97                 if (dom_res->count != 1) {
  98                         DEBUG(2,("Error finding domain '%s'/'%s' in sam\n", domain, ldb_dn_get_linearized(domain_dn)));
  99                         return NT_STATUS_NO_SUCH_DOMAIN;
 100                 }
 101         }
 102
 103         if ((dom_res == NULL || dom_res->count == 0) && (domain_guid || domain_sid)) {
 104
 105                 if (domain_guid) {
 106                         struct GUID binary_guid;
 107                         struct ldb_val guid_val;
 108                         enum ndr_err_code ndr_err;
 109
 110                         /* By this means, we ensure we don't have funny stuff in the GUID */
 111
 112                         status = GUID_from_string(domain_guid, &binary_guid);
 113                         if (!NT_STATUS_IS_OK(status)) {
 114                                 return status;
 115                         }
 116
 117                         /* And this gets the result into the binary format we want anyway */
 118                         ndr_err = ndr_push_struct_blob(&guid_val, mem_ctx, NULL, &binary_guid,
 119                                                        (ndr_push_flags_fn_t)ndr_push_GUID);
 120                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 121                                 return NT_STATUS_INVALID_PARAMETER;
 122                         }
 123                         ret = ldb_search(sam_ctx, mem_ctx, &dom_res,
 124                                                  NULL, LDB_SCOPE_SUBTREE,
 125                                                  dom_attrs,
 126                                                  "(&(objectCategory=DomainDNS)(objectGUID=%s))",
 127                                                  ldb_binary_encode(mem_ctx, guid_val));
 128                 } else { /* domain_sid case */
 129                         struct dom_sid *sid;
 130                         struct ldb_val sid_val;
 131                         enum ndr_err_code ndr_err;
 132
 133                         /* Rather than go via the string, just push into the NDR form */
 134                         ndr_err = ndr_push_struct_blob(&sid_val, mem_ctx, NULL, &sid,
 135                                                        (ndr_push_flags_fn_t)ndr_push_dom_sid);
 136                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 137                                 return NT_STATUS_INVALID_PARAMETER;
 138                         }
 139
 140                         ret = ldb_search(sam_ctx, mem_ctx, &dom_res,
 141                                                  NULL, LDB_SCOPE_SUBTREE,
 142                                                  dom_attrs,
 143                                                  "(&(objectCategory=DomainDNS)(objectSID=%s))",
 144                                                  ldb_binary_encode(mem_ctx, sid_val));
 145                 }
 146
 147                 if (ret != LDB_SUCCESS) {
 148                         DEBUG(2,("Unable to find referece to GUID '%s' or SID %s in sam: %s\n",
 149                                  domain_guid, dom_sid_string(mem_ctx, domain_sid),
 150                                  ldb_errstring(sam_ctx)));
 151                         return NT_STATUS_NO_SUCH_DOMAIN;
 152                 } else if (dom_res->count == 1) {
 153                         /* Ok, now just check it is our domain */
 154
 155                         if (ldb_dn_compare(ldb_get_default_basedn(sam_ctx), dom_res->msgs[0]->dn) != 0) {
 156                                 return NT_STATUS_NO_SUCH_DOMAIN;
 157                         }
 158                 } else if (dom_res->count > 1) {
 159                         return NT_STATUS_NO_SUCH_DOMAIN;
 160                 }
 161         }
 162
 163
 164         if ((dom_res == NULL || dom_res->count == 0)) {
 165                 DEBUG(2,("Unable to find domain with name %s or GUID {%s}\n", domain, domain_guid));
 166                 return NT_STATUS_NO_SUCH_DOMAIN;
 167         }
 168
 169         /* work around different inputs for not-specified users */
 170         if (!user) {
 171                 user = "";
 172         }
 173
 174         /* Enquire about any valid username with just a CLDAP packet -
 175          * if kerberos didn't also do this, the security folks would
 176          * scream... */
 177         if (user[0]) {                                                  \
 178                 /* Only allow some bits to be enquired:  [MS-ATDS] 7.3.3.2 */
 179                 if (acct_control == (uint32_t)-1) {
 180                         acct_control = 0;
 181                 }
 182                 acct_control = acct_control & (ACB_TEMPDUP | ACB_NORMAL | ACB_DOMTRUST | ACB_WSTRUST | ACB_SVRTRUST);
 183
 184                 /* We must exclude disabled accounts, but otherwise do the bitwise match the client asked for */
 185                 ret = ldb_search(sam_ctx, mem_ctx, &user_res,
 186                                          dom_res->msgs[0]->dn, LDB_SCOPE_SUBTREE,
 187                                          none_attrs,
 188                                          "(&(objectClass=user)(samAccountName=%s)"
 189                                          "(!(userAccountControl:" LDB_OID_COMPARATOR_AND ":=%u))"
 190                                          "(userAccountControl:" LDB_OID_COMPARATOR_OR ":=%u))",
 191                                          ldb_binary_encode_string(mem_ctx, user),
 192                                          UF_ACCOUNTDISABLE, samdb_acb2uf(acct_control));
 193                 if (ret != LDB_SUCCESS) {
 194                         DEBUG(2,("Unable to find referece to user '%s' with ACB 0x%8x under %s: %s\n",
 195                                  user, acct_control, ldb_dn_get_linearized(dom_res->msgs[0]->dn),
 196                                  ldb_errstring(sam_ctx)));
 197                         return NT_STATUS_NO_SUCH_USER;
 198                 } else if (user_res->count == 1) {
 199                         user_known = true;
 200                 } else {
 201                         user_known = false;
 202                 }
 203
 204         } else {
 205                 user_known = true;
 206         }
 207
 208         server_type      =
 209                 NBT_SERVER_DS | NBT_SERVER_TIMESERV |
 210                 NBT_SERVER_CLOSEST | NBT_SERVER_WRITABLE |
 211                 NBT_SERVER_GOOD_TIMESERV | DS_DNS_CONTROLLER |
 212                 DS_DNS_DOMAIN;
 213
 214         if (samdb_is_pdc(sam_ctx)) {
 215                 server_type |= NBT_SERVER_PDC;
 216         }
 217
 218         if (samdb_is_gc(sam_ctx)) {
 219                 server_type |= NBT_SERVER_GC;
 220         }
 221
 222         if (str_list_check(services, "ldap")) {
 223                 server_type |= NBT_SERVER_LDAP;
 224         }
 225
 226         if (str_list_check(services, "kdc")) {
 227                 server_type |= NBT_SERVER_KDC;
 228         }
 229
 230         if (ldb_dn_compare(ldb_get_root_basedn(sam_ctx), ldb_get_default_basedn(sam_ctx)) == 0) {
 231                 server_type |= DS_DNS_FOREST;
 232         }
 233
 234         pdc_name         = talloc_asprintf(mem_ctx, "\\\\%s", lp_netbios_name(lp_ctx));
 235         domain_uuid      = samdb_result_guid(dom_res->msgs[0], "objectGUID");
 236         realm            = lp_realm(lp_ctx);
 237         dns_domain       = lp_realm(lp_ctx);
 238         pdc_dns_name     = talloc_asprintf(mem_ctx, "%s.%s",
 239                                            strlower_talloc(mem_ctx,
 240                                                            lp_netbios_name(lp_ctx)),
 241                                            dns_domain);
 242
 243         flatname         = lp_sam_name(lp_ctx);
 244         /* FIXME: Hardcoded site names */
 245         server_site      = "Default-First-Site-Name";
 246         client_site      = "Default-First-Site-Name";
 247         load_interfaces(mem_ctx, lp_interfaces(lp_ctx), &ifaces);
 248         pdc_ip           = iface_best_ip(ifaces, src_address);
 249
 250         ZERO_STRUCTP(netlogon);
 251
 252         /* check if either of these bits is present */
 253         if (version & (NETLOGON_NT_VERSION_5EX|NETLOGON_NT_VERSION_5EX_WITH_IP)) {
 254                 uint32_t extra_flags = 0;
 255                 netlogon->ntver = NETLOGON_NT_VERSION_5EX;
 256
 257                 /* could check if the user exists */
 258                 if (user_known) {
 259                         netlogon->data.nt5_ex.command      = LOGON_SAM_LOGON_RESPONSE_EX;
 260                 } else {
 261                         netlogon->data.nt5_ex.command      = LOGON_SAM_LOGON_USER_UNKNOWN_EX;
 262                 }
 263                 netlogon->data.nt5_ex.server_type  = server_type;
 264                 netlogon->data.nt5_ex.domain_uuid  = domain_uuid;
 265                 netlogon->data.nt5_ex.forest       = realm;
 266                 netlogon->data.nt5_ex.dns_domain   = dns_domain;
 267                 netlogon->data.nt5_ex.pdc_dns_name = pdc_dns_name;
 268                 netlogon->data.nt5_ex.domain       = flatname;
 269                 netlogon->data.nt5_ex.pdc_name     = lp_netbios_name(lp_ctx);
 270                 netlogon->data.nt5_ex.user_name    = user;
 271                 netlogon->data.nt5_ex.server_site  = server_site;
 272                 netlogon->data.nt5_ex.client_site  = client_site;
 273
 274                 if (version & NETLOGON_NT_VERSION_5EX_WITH_IP) {
 275                         /* Clearly this needs to be fixed up for IPv6 */
 276                         extra_flags = NETLOGON_NT_VERSION_5EX_WITH_IP;
 277                         netlogon->data.nt5_ex.sockaddr.sockaddr_family    = 2;
 278                         netlogon->data.nt5_ex.sockaddr.pdc_ip       = pdc_ip;
 279                         netlogon->data.nt5_ex.sockaddr.remaining = data_blob_talloc_zero(mem_ctx, 8);
 280                 }
 281                 netlogon->data.nt5_ex.nt_version   = NETLOGON_NT_VERSION_1|NETLOGON_NT_VERSION_5EX|extra_flags;
 282                 netlogon->data.nt5_ex.lmnt_token   = 0xFFFF;
 283                 netlogon->data.nt5_ex.lm20_token   = 0xFFFF;
 284
 285         } else if (version & NETLOGON_NT_VERSION_5) {
 286                 netlogon->ntver = NETLOGON_NT_VERSION_5;
 287
 288                 /* could check if the user exists */
 289                 if (user_known) {
 290                         netlogon->data.nt5.command      = LOGON_SAM_LOGON_RESPONSE;
 291                 } else {
 292                         netlogon->data.nt5.command      = LOGON_SAM_LOGON_USER_UNKNOWN;
 293                 }
 294                 netlogon->data.nt5.pdc_name     = pdc_name;
 295                 netlogon->data.nt5.user_name    = user;
 296                 netlogon->data.nt5.domain_name  = flatname;
 297                 netlogon->data.nt5.domain_uuid  = domain_uuid;
 298                 netlogon->data.nt5.forest       = realm;
 299                 netlogon->data.nt5.dns_domain   = dns_domain;
 300                 netlogon->data.nt5.pdc_dns_name = pdc_dns_name;
 301                 netlogon->data.nt5.pdc_ip       = pdc_ip;
 302                 netlogon->data.nt5.server_type  = server_type;
 303                 netlogon->data.nt5.nt_version   = NETLOGON_NT_VERSION_1|NETLOGON_NT_VERSION_5;
 304                 netlogon->data.nt5.lmnt_token   = 0xFFFF;
 305                 netlogon->data.nt5.lm20_token   = 0xFFFF;
 306
 307         } else /* (version & NETLOGON_NT_VERSION_1) and all other cases */ {
 308                 netlogon->ntver = NETLOGON_NT_VERSION_1;
 309                 /* could check if the user exists */
 310                 if (user_known) {
 311                         netlogon->data.nt4.command      = LOGON_SAM_LOGON_RESPONSE;
 312                 } else {
 313                         netlogon->data.nt4.command      = LOGON_SAM_LOGON_USER_UNKNOWN;
 314                 }
 315                 netlogon->data.nt4.server      = pdc_name;
 316                 netlogon->data.nt4.user_name   = user;
 317                 netlogon->data.nt4.domain      = flatname;
 318                 netlogon->data.nt4.nt_version  = NETLOGON_NT_VERSION_1;
 319                 netlogon->data.nt4.lmnt_token  = 0xFFFF;
 320                 netlogon->data.nt4.lm20_token  = 0xFFFF;
 321         }
 322
 323         return NT_STATUS_OK;
 324 }
 325
 326
 327 /*
 328   handle incoming cldap requests
 329 */
 330 void cldapd_netlogon_request(struct cldap_socket *cldap,
 331                              struct cldapd_server *cldapd,
 332                              TALLOC_CTX *tmp_ctx,
 333                              uint32_t message_id,
 334                              struct ldb_parse_tree *tree,
 335                              struct tsocket_address *src)
 336 {
 337         int i;
 338         const char *domain = NULL;
 339         const char *host = NULL;
 340         const char *user = NULL;
 341         const char *domain_guid = NULL;
 342         const char *domain_sid = NULL;
 343         int acct_control = -1;
 344         int version = -1;
 345         struct netlogon_samlogon_response netlogon;
 346         NTSTATUS status = NT_STATUS_INVALID_PARAMETER;
 347
 348         if (tree->operation != LDB_OP_AND) goto failed;
 349
 350         /* extract the query elements */
 351         for (i=0;i<tree->u.list.num_elements;i++) {
 352                 struct ldb_parse_tree *t = tree->u.list.elements[i];
 353                 if (t->operation != LDB_OP_EQUALITY) goto failed;
 354                 if (strcasecmp(t->u.equality.attr, "DnsDomain") == 0) {
 355                         domain = talloc_strndup(tmp_ctx,
 356                                                 (const char *)t->u.equality.value.data,
 357                                                 t->u.equality.value.length);
 358                 }
 359                 if (strcasecmp(t->u.equality.attr, "Host") == 0) {
 360                         host = talloc_strndup(tmp_ctx,
 361                                               (const char *)t->u.equality.value.data,
 362                                               t->u.equality.value.length);
 363                 }
 364                 if (strcasecmp(t->u.equality.attr, "DomainGuid") == 0) {
 365                         NTSTATUS enc_status;
 366                         struct GUID guid;
 367                         enc_status = ldap_decode_ndr_GUID(tmp_ctx,
 368                                                           t->u.equality.value, &guid);
 369                         if (NT_STATUS_IS_OK(enc_status)) {
 370                                 domain_guid = GUID_string(tmp_ctx, &guid);
 371                         }
 372                 }
 373                 if (strcasecmp(t->u.equality.attr, "DomainSid") == 0) {
 374                         domain_sid = talloc_strndup(tmp_ctx,
 375                                                     (const char *)t->u.equality.value.data,
 376                                                     t->u.equality.value.length);
 377                 }
 378                 if (strcasecmp(t->u.equality.attr, "User") == 0) {
 379                         user = talloc_strndup(tmp_ctx,
 380                                               (const char *)t->u.equality.value.data,
 381                                               t->u.equality.value.length);
 382                 }
 383                 if (strcasecmp(t->u.equality.attr, "NtVer") == 0 &&
 384                     t->u.equality.value.length == 4) {
 385                         version = IVAL(t->u.equality.value.data, 0);
 386                 }
 387                 if (strcasecmp(t->u.equality.attr, "AAC") == 0 &&
 388                     t->u.equality.value.length == 4) {
 389                         acct_control = IVAL(t->u.equality.value.data, 0);
 390                 }
 391         }
 392
 393         if (domain_guid == NULL && domain == NULL) {
 394                 domain = lp_realm(cldapd->task->lp_ctx);
 395         }
 396
 397         if (version == -1) {
 398                 goto failed;
 399         }
 400
 401         DEBUG(5,("cldap netlogon query domain=%s host=%s user=%s version=%d guid=%s\n",
 402                  domain, host, user, version, domain_guid));
 403
 404         status = fill_netlogon_samlogon_response(cldapd->samctx, tmp_ctx, domain, NULL, NULL, domain_guid,
 405                                                  user, acct_control,
 406                                                  tsocket_address_inet_addr_string(src, tmp_ctx),
 407                                                  version, cldapd->task->lp_ctx, &netlogon);
 408         if (!NT_STATUS_IS_OK(status)) {
 409                 goto failed;
 410         }
 411
 412         status = cldap_netlogon_reply(cldap,
 413                                       lp_iconv_convenience(cldapd->task->lp_ctx),
 414                                       message_id, src, version,
 415                                       &netlogon);
 416         if (!NT_STATUS_IS_OK(status)) {
 417                 goto failed;
 418         }
 419
 420         return;
 421
 422 failed:
 423         DEBUG(2,("cldap netlogon query failed domain=%s host=%s version=%d - %s\n",
 424                  domain, host, version, nt_errstr(status)));
 425         cldap_empty_reply(cldap, message_id, src);
 426 }