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 "lib/socket/socket.h"
  28 #include "smbd/service_task.h"
  29 #include "cldap_server/cldap_server.h"
  30 #include "librpc/gen_ndr/ndr_misc.h"
  31 #include "libcli/ldap/ldap_ndr.h"
  32 #include "libcli/security/security.h"
  33 #include "dsdb/samdb/samdb.h"
  34 #include "auth/auth.h"
  35 #include "ldb_wrap.h"
  36 #include "system/network.h"
  37 #include "lib/socket/netif.h"
  38 #include "param/param.h"
  39 /*
  40   fill in the cldap netlogon union for a given version
  41 */
  42 NTSTATUS fill_netlogon_samlogon_response(struct ldb_context *sam_ctx,
  43                                          TALLOC_CTX *mem_ctx,
  44                                          const char *domain,
  45                                          const char *netbios_domain,
  46                                          struct dom_sid *domain_sid,
  47                                          const char *domain_guid,
  48                                          const char *user,
  49                                          uint32_t acct_control,
  50                                          const char *src_address,
  51                                          uint32_t version,
  52                                          struct loadparm_context *lp_ctx,
  53                                          struct netlogon_samlogon_response *netlogon)
  54 {
  55         const char *ref_attrs[] = {"nETBIOSName", "dnsRoot", "ncName", NULL};
  56         const char *dom_attrs[] = {"objectGUID", NULL};
  57         const char *none_attrs[] = {NULL};
  58         struct ldb_result *ref_res = NULL, *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 *partitions_basedn;
  72         struct interface *ifaces;
  73         bool user_known;
  74
  75         partitions_basedn = samdb_partitions_dn(sam_ctx, mem_ctx);
  76
  77         /* the domain has an optional trailing . */
  78         if (domain && domain[strlen(domain)-1] == '.') {
  79                 domain = talloc_strndup(mem_ctx, domain, strlen(domain)-1);
  80         }
  81
  82         if (domain) {
  83                 struct ldb_dn *dom_dn;
  84                 /* try and find the domain */
  85
  86                 ret = ldb_search_exp_fmt(sam_ctx, mem_ctx, &ref_res,
  87                                          partitions_basedn, LDB_SCOPE_ONELEVEL,
  88                                          ref_attrs,
  89                                          "(&(&(objectClass=crossRef)(dnsRoot=%s))(nETBIOSName=*))",
  90                                          domain);
  91
  92                 if (ret != LDB_SUCCESS) {
  93                         DEBUG(2,("Unable to find referece to '%s' in sam: %s\n",
  94                                  domain,
  95                                  ldb_errstring(sam_ctx)));
  96                         return NT_STATUS_NO_SUCH_DOMAIN;
  97                 } else if (ref_res->count == 1) {
  98                         talloc_steal(mem_ctx, dom_res);
  99                         dom_dn = ldb_msg_find_attr_as_dn(sam_ctx, mem_ctx, ref_res->msgs[0], "ncName");
 100                         if (!dom_dn) {
 101                                 return NT_STATUS_NO_SUCH_DOMAIN;
 102                         }
 103                         ret = ldb_search(sam_ctx, dom_dn,
 104                                          LDB_SCOPE_BASE, "objectClass=domain",
 105                                          dom_attrs, &dom_res);
 106                         if (ret != LDB_SUCCESS) {
 107                                 DEBUG(2,("Error finding domain '%s'/'%s' in sam: %s\n", domain, ldb_dn_get_linearized(dom_dn), ldb_errstring(sam_ctx)));
 108                                 return NT_STATUS_NO_SUCH_DOMAIN;
 109                         }
 110                         talloc_steal(mem_ctx, dom_res);
 111                         if (dom_res->count != 1) {
 112                                 DEBUG(2,("Error finding domain '%s'/'%s' in sam\n", domain, ldb_dn_get_linearized(dom_dn)));
 113                                 return NT_STATUS_NO_SUCH_DOMAIN;
 114                         }
 115                 } else if (ref_res->count > 1) {
 116                         talloc_free(ref_res);
 117                         return NT_STATUS_NO_SUCH_DOMAIN;
 118                 }
 119         }
 120
 121         if (netbios_domain) {
 122                 struct ldb_dn *dom_dn;
 123                 /* try and find the domain */
 124
 125                 ret = ldb_search_exp_fmt(sam_ctx, mem_ctx, &ref_res,
 126                                          partitions_basedn, LDB_SCOPE_ONELEVEL,
 127                                          ref_attrs,
 128                                          "(&(objectClass=crossRef)(ncName=*)(nETBIOSName=%s))",
 129                                          netbios_domain);
 130
 131                 if (ret != LDB_SUCCESS) {
 132                         DEBUG(2,("Unable to find referece to '%s' in sam: %s\n",
 133                                  netbios_domain,
 134                                  ldb_errstring(sam_ctx)));
 135                         return NT_STATUS_NO_SUCH_DOMAIN;
 136                 } else if (ref_res->count == 1) {
 137                         talloc_steal(mem_ctx, dom_res);
 138                         dom_dn = ldb_msg_find_attr_as_dn(sam_ctx, mem_ctx, ref_res->msgs[0], "ncName");
 139                         if (!dom_dn) {
 140                                 return NT_STATUS_NO_SUCH_DOMAIN;
 141                         }
 142                         ret = ldb_search(sam_ctx, dom_dn,
 143                                          LDB_SCOPE_BASE, "objectClass=domain",
 144                                          dom_attrs, &dom_res);
 145                         if (ret != LDB_SUCCESS) {
 146                                 DEBUG(2,("Error finding domain '%s'/'%s' in sam: %s\n", domain, ldb_dn_get_linearized(dom_dn), ldb_errstring(sam_ctx)));
 147                                 return NT_STATUS_NO_SUCH_DOMAIN;
 148                         }
 149                         talloc_steal(mem_ctx, dom_res);
 150                         if (dom_res->count != 1) {
 151                                 DEBUG(2,("Error finding domain '%s'/'%s' in sam\n", domain, ldb_dn_get_linearized(dom_dn)));
 152                                 return NT_STATUS_NO_SUCH_DOMAIN;
 153                         }
 154                 } else if (ref_res->count > 1) {
 155                         talloc_free(ref_res);
 156                         return NT_STATUS_NO_SUCH_DOMAIN;
 157                 }
 158         }
 159
 160         if ((dom_res == NULL || dom_res->count == 0) && (domain_guid || domain_sid)) {
 161                 ref_res = NULL;
 162
 163                 if (domain_guid) {
 164                         ret = ldb_search_exp_fmt(sam_ctx, mem_ctx, &dom_res,
 165                                                  NULL, LDB_SCOPE_SUBTREE,
 166                                                  dom_attrs,
 167                                                  "(&(objectClass=domainDNS)(objectGUID=%s))",
 168                                                  domain_guid);
 169                 } else { /* domain_sid case */
 170                         ret = ldb_search_exp_fmt(sam_ctx, mem_ctx, &dom_res,
 171                                                  NULL, LDB_SCOPE_SUBTREE,
 172                                                  dom_attrs,
 173                                                  "(&(objectClass=domainDNS)(objectSID=%s))",
 174                                                  dom_sid_string(mem_ctx, domain_sid));
 175                 }
 176
 177                 if (ret != LDB_SUCCESS) {
 178                         DEBUG(2,("Unable to find referece to GUID '%s' or SID %s in sam: %s\n",
 179                                  domain_guid, dom_sid_string(mem_ctx, domain_sid),
 180                                  ldb_errstring(sam_ctx)));
 181                         return NT_STATUS_NO_SUCH_DOMAIN;
 182                 } else if (dom_res->count == 1) {
 183                         /* try and find the domain */
 184                         ret = ldb_search_exp_fmt(sam_ctx, mem_ctx, &ref_res,
 185                                                  partitions_basedn, LDB_SCOPE_ONELEVEL,
 186                                                  ref_attrs,
 187                                                  "(&(objectClass=crossRef)(ncName=%s))",
 188                                                  ldb_dn_get_linearized(dom_res->msgs[0]->dn));
 189
 190                         if (ret != LDB_SUCCESS) {
 191                                 DEBUG(2,("Unable to find referece to '%s' in sam: %s\n",
 192                                          ldb_dn_get_linearized(dom_res->msgs[0]->dn),
 193                                          ldb_errstring(sam_ctx)));
 194                                 return NT_STATUS_NO_SUCH_DOMAIN;
 195
 196                         } else if (ref_res->count != 1) {
 197                                 DEBUG(2,("Unable to find referece to '%s' in sam\n",
 198                                          ldb_dn_get_linearized(dom_res->msgs[0]->dn)));
 199                                 return NT_STATUS_NO_SUCH_DOMAIN;
 200                         }
 201                 } else if (dom_res->count > 1) {
 202                         talloc_free(ref_res);
 203                         return NT_STATUS_NO_SUCH_DOMAIN;
 204                 }
 205         }
 206
 207
 208         if ((ref_res == NULL || ref_res->count == 0)) {
 209                 DEBUG(2,("Unable to find domain reference with name %s or GUID {%s}\n", domain, domain_guid));
 210                 return NT_STATUS_NO_SUCH_DOMAIN;
 211         }
 212
 213         if ((dom_res == NULL || dom_res->count == 0)) {
 214                 DEBUG(2,("Unable to find domain with name %s or GUID {%s}\n", domain, domain_guid));
 215                 return NT_STATUS_NO_SUCH_DOMAIN;
 216         }
 217
 218         /* work around different inputs for not-specified users */
 219         if (!user) {
 220                 user = "";
 221         }
 222
 223         /* Enquire about any valid username with just a CLDAP packet -
 224          * if kerberos didn't also do this, the security folks would
 225          * scream... */
 226         if (user[0]) {                                                  \
 227                 /* Only allow some bits to be enquired:  [MS-ATDS] 7.3.3.2 */
 228                 if (acct_control == (uint32_t)-1) {
 229                         acct_control = 0;
 230                 }
 231                 acct_control = acct_control & (ACB_TEMPDUP | ACB_NORMAL | ACB_DOMTRUST | ACB_WSTRUST | ACB_SVRTRUST);
 232
 233                 /* We must exclude disabled accounts, but otherwise do the bitwise match the client asked for */
 234                 ret = ldb_search_exp_fmt(sam_ctx, mem_ctx, &user_res,
 235                                          dom_res->msgs[0]->dn, LDB_SCOPE_SUBTREE,
 236                                          none_attrs,
 237                                          "(&(objectClass=user)(samAccountName=%s)"
 238                                          "(!(userAccountControl:" LDB_OID_COMPARATOR_AND ":=%u))"
 239                                          "(userAccountControl:" LDB_OID_COMPARATOR_OR ":=%u))",
 240                                          user, UF_ACCOUNTDISABLE, samdb_acb2uf(acct_control));
 241                 if (ret != LDB_SUCCESS) {
 242                         DEBUG(2,("Unable to find referece to user '%s' with ACB 0x%8x under %s: %s\n",
 243                                  user, acct_control, ldb_dn_get_linearized(dom_res->msgs[0]->dn),
 244                                  ldb_errstring(sam_ctx)));
 245                         return NT_STATUS_NO_SUCH_USER;
 246                 } else if (user_res->count == 1) {
 247                         user_known = true;
 248                 } else {
 249                         user_known = false;
 250                 }
 251
 252         } else {
 253                 user_known = true;
 254         }
 255
 256         server_type      =
 257                 NBT_SERVER_DS | NBT_SERVER_TIMESERV |
 258                 NBT_SERVER_CLOSEST | NBT_SERVER_WRITABLE |
 259                 NBT_SERVER_GOOD_TIMESERV | NBT_SERVER_DS_DNS_CONTR |
 260                 NBT_SERVER_DS_DNS_DOMAIN;
 261
 262         if (samdb_is_pdc(sam_ctx)) {
 263                 server_type |= NBT_SERVER_PDC;
 264         }
 265
 266         if (samdb_is_gc(sam_ctx)) {
 267                 server_type |= NBT_SERVER_GC;
 268         }
 269
 270         if (str_list_check(services, "ldap")) {
 271                 server_type |= NBT_SERVER_LDAP;
 272         }
 273
 274         if (str_list_check(services, "kdc")) {
 275                 server_type |= NBT_SERVER_KDC;
 276         }
 277
 278         if (!ldb_dn_compare_base(ldb_get_root_basedn(sam_ctx), ldb_get_default_basedn(sam_ctx))) {
 279                 server_type |= NBT_SERVER_DS_DNS_FOREST;
 280         }
 281
 282         pdc_name         = talloc_asprintf(mem_ctx, "\\\\%s", lp_netbios_name(lp_ctx));
 283         domain_uuid      = samdb_result_guid(dom_res->msgs[0], "objectGUID");
 284         realm            = samdb_result_string(ref_res->msgs[0], "dnsRoot", lp_realm(lp_ctx));
 285         dns_domain       = samdb_result_string(ref_res->msgs[0], "dnsRoot", lp_realm(lp_ctx));
 286         pdc_dns_name     = talloc_asprintf(mem_ctx, "%s.%s",
 287                                            strlower_talloc(mem_ctx,
 288                                                            lp_netbios_name(lp_ctx)),
 289                                            dns_domain);
 290
 291         flatname         = samdb_result_string(ref_res->msgs[0], "nETBIOSName",
 292                                                lp_workgroup(lp_ctx));
 293         /* FIXME: Hardcoded site names */
 294         server_site      = "Default-First-Site-Name";
 295         client_site      = "Default-First-Site-Name";
 296         load_interfaces(mem_ctx, lp_interfaces(lp_ctx), &ifaces);
 297         pdc_ip           = iface_best_ip(ifaces, src_address);
 298
 299         ZERO_STRUCTP(netlogon);
 300
 301         /* check if either of these bits is present */
 302         if (version & (NETLOGON_NT_VERSION_5EX|NETLOGON_NT_VERSION_5EX_WITH_IP)) {
 303                 uint32_t extra_flags = 0;
 304                 netlogon->ntver = NETLOGON_NT_VERSION_5EX;
 305
 306                 /* could check if the user exists */
 307                 if (user_known) {
 308                         netlogon->nt5_ex.command      = LOGON_SAM_LOGON_RESPONSE_EX;
 309                 } else {
 310                         netlogon->nt5_ex.command      = LOGON_SAM_LOGON_USER_UNKNOWN_EX;
 311                 }
 312                 netlogon->nt5_ex.server_type  = server_type;
 313                 netlogon->nt5_ex.domain_uuid  = domain_uuid;
 314                 netlogon->nt5_ex.forest       = realm;
 315                 netlogon->nt5_ex.dns_domain   = dns_domain;
 316                 netlogon->nt5_ex.pdc_dns_name = pdc_dns_name;
 317                 netlogon->nt5_ex.domain       = flatname;
 318                 netlogon->nt5_ex.pdc_name     = lp_netbios_name(lp_ctx);
 319                 netlogon->nt5_ex.user_name    = user;
 320                 netlogon->nt5_ex.server_site  = server_site;
 321                 netlogon->nt5_ex.client_site  = client_site;
 322
 323                 if (version & NETLOGON_NT_VERSION_5EX_WITH_IP) {
 324                         /* Clearly this needs to be fixed up for IPv6 */
 325                         extra_flags = NETLOGON_NT_VERSION_5EX_WITH_IP;
 326                         netlogon->nt5_ex.sockaddr.sa_family    = 2;
 327                         netlogon->nt5_ex.sockaddr.pdc_ip       = pdc_ip;
 328                         netlogon->nt5_ex.sockaddr.remaining = data_blob_talloc_zero(mem_ctx, 8);
 329                 }
 330                 netlogon->nt5_ex.nt_version   = NETLOGON_NT_VERSION_1|NETLOGON_NT_VERSION_5EX|extra_flags;
 331                 netlogon->nt5_ex.lmnt_token   = 0xFFFF;
 332                 netlogon->nt5_ex.lm20_token   = 0xFFFF;
 333
 334         } else if (version & NETLOGON_NT_VERSION_5) {
 335                 netlogon->ntver = NETLOGON_NT_VERSION_5;
 336
 337                 /* could check if the user exists */
 338                 if (user_known) {
 339                         netlogon->nt5.command      = LOGON_SAM_LOGON_RESPONSE;
 340                 } else {
 341                         netlogon->nt5.command      = LOGON_SAM_LOGON_USER_UNKNOWN;
 342                 }
 343                 netlogon->nt5.pdc_name     = pdc_name;
 344                 netlogon->nt5.user_name    = user;
 345                 netlogon->nt5.domain_name  = flatname;
 346                 netlogon->nt5.domain_uuid  = domain_uuid;
 347                 netlogon->nt5.forest       = realm;
 348                 netlogon->nt5.dns_domain   = dns_domain;
 349                 netlogon->nt5.pdc_dns_name = pdc_dns_name;
 350                 netlogon->nt5.pdc_ip       = pdc_ip;
 351                 netlogon->nt5.server_type  = server_type;
 352                 netlogon->nt5.nt_version   = NETLOGON_NT_VERSION_1|NETLOGON_NT_VERSION_5;
 353                 netlogon->nt5.lmnt_token   = 0xFFFF;
 354                 netlogon->nt5.lm20_token   = 0xFFFF;
 355
 356         } else /* (version & NETLOGON_NT_VERSION_1) and all other cases */ {
 357                 netlogon->ntver = NETLOGON_NT_VERSION_1;
 358                 /* could check if the user exists */
 359                 if (user_known) {
 360                         netlogon->nt4.command      = LOGON_SAM_LOGON_RESPONSE;
 361                 } else {
 362                         netlogon->nt4.command      = LOGON_SAM_LOGON_USER_UNKNOWN;
 363                 }
 364                 netlogon->nt4.server      = pdc_name;
 365                 netlogon->nt4.user_name   = user;
 366                 netlogon->nt4.domain      = flatname;
 367                 netlogon->nt4.nt_version  = NETLOGON_NT_VERSION_1;
 368                 netlogon->nt4.lmnt_token  = 0xFFFF;
 369                 netlogon->nt4.lm20_token  = 0xFFFF;
 370         }
 371
 372         return NT_STATUS_OK;
 373 }
 374
 375
 376 /*
 377   handle incoming cldap requests
 378 */
 379 void cldapd_netlogon_request(struct cldap_socket *cldap,
 380                              uint32_t message_id,
 381                              struct ldb_parse_tree *tree,
 382                              struct socket_address *src)
 383 {
 384         struct cldapd_server *cldapd = talloc_get_type(cldap->incoming.private, struct cldapd_server);
 385         int i;
 386         const char *domain = NULL;
 387         const char *host = NULL;
 388         const char *user = NULL;
 389         const char *domain_guid = NULL;
 390         const char *domain_sid = NULL;
 391         int acct_control = -1;
 392         int version = -1;
 393         struct netlogon_samlogon_response netlogon;
 394         NTSTATUS status = NT_STATUS_INVALID_PARAMETER;
 395
 396         TALLOC_CTX *tmp_ctx = talloc_new(cldap);
 397
 398         if (tree->operation != LDB_OP_AND) goto failed;
 399
 400         /* extract the query elements */
 401         for (i=0;i<tree->u.list.num_elements;i++) {
 402                 struct ldb_parse_tree *t = tree->u.list.elements[i];
 403                 if (t->operation != LDB_OP_EQUALITY) goto failed;
 404                 if (strcasecmp(t->u.equality.attr, "DnsDomain") == 0) {
 405                         domain = talloc_strndup(tmp_ctx,
 406                                                 (const char *)t->u.equality.value.data,
 407                                                 t->u.equality.value.length);
 408                 }
 409                 if (strcasecmp(t->u.equality.attr, "Host") == 0) {
 410                         host = talloc_strndup(tmp_ctx,
 411                                               (const char *)t->u.equality.value.data,
 412                                               t->u.equality.value.length);
 413                 }
 414                 if (strcasecmp(t->u.equality.attr, "DomainGuid") == 0) {
 415                         NTSTATUS enc_status;
 416                         struct GUID guid;
 417                         enc_status = ldap_decode_ndr_GUID(tmp_ctx,
 418                                                           t->u.equality.value, &guid);
 419                         if (NT_STATUS_IS_OK(enc_status)) {
 420                                 domain_guid = GUID_string(tmp_ctx, &guid);
 421                         }
 422                 }
 423                 if (strcasecmp(t->u.equality.attr, "DomainSid") == 0) {
 424                         domain_sid = talloc_strndup(tmp_ctx,
 425                                                     (const char *)t->u.equality.value.data,
 426                                                     t->u.equality.value.length);
 427                 }
 428                 if (strcasecmp(t->u.equality.attr, "User") == 0) {
 429                         user = talloc_strndup(tmp_ctx,
 430                                               (const char *)t->u.equality.value.data,
 431                                               t->u.equality.value.length);
 432                 }
 433                 if (strcasecmp(t->u.equality.attr, "NtVer") == 0 &&
 434                     t->u.equality.value.length == 4) {
 435                         version = IVAL(t->u.equality.value.data, 0);
 436                 }
 437                 if (strcasecmp(t->u.equality.attr, "AAC") == 0 &&
 438                     t->u.equality.value.length == 4) {
 439                         acct_control = IVAL(t->u.equality.value.data, 0);
 440                 }
 441         }
 442
 443         if (domain_guid == NULL && domain == NULL) {
 444                 domain = lp_realm(cldapd->task->lp_ctx);
 445         }
 446
 447         if (version == -1) {
 448                 goto failed;
 449         }
 450
 451         DEBUG(5,("cldap netlogon query domain=%s host=%s user=%s version=%d guid=%s\n",
 452                  domain, host, user, version, domain_guid));
 453
 454         status = fill_netlogon_samlogon_response(cldapd->samctx, tmp_ctx, domain, NULL, NULL, domain_guid,
 455                                                  user, acct_control, src->addr,
 456                                                  version, cldapd->task->lp_ctx, &netlogon);
 457         if (!NT_STATUS_IS_OK(status)) {
 458                 goto failed;
 459         }
 460
 461         status = cldap_netlogon_reply(cldap, message_id, src, version,
 462                                       &netlogon);
 463         if (!NT_STATUS_IS_OK(status)) {
 464                 goto failed;
 465         }
 466
 467         talloc_free(tmp_ctx);
 468         return;
 469
 470 failed:
 471         DEBUG(2,("cldap netlogon query failed domain=%s host=%s version=%d - %s\n",
 472                  domain, host, version, nt_errstr(status)));
 473         talloc_free(tmp_ctx);
 474         cldap_empty_reply(cldap, message_id, src);
 475 }