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 *pdc_dns_name;
  66         const char *flatname;
  67         const char *server_site;
  68         const char *client_site;
  69         const char *pdc_ip;
  70         struct ldb_dn *domain_dn = NULL;
  71         struct interface *ifaces;
  72         bool user_known;
  73         NTSTATUS status;
  74
  75         /* the domain has an optional trailing . */
  76         if (domain && domain[strlen(domain)-1] == '.') {
  77                 domain = talloc_strndup(mem_ctx, domain, strlen(domain)-1);
  78         }
  79
  80         if (domain && strcasecmp_m(domain, lp_dnsdomain(lp_ctx)) == 0) {
  81                 domain_dn = ldb_get_default_basedn(sam_ctx);
  82         }
  83
  84         if (netbios_domain && strcasecmp_m(domain, lp_sam_name(lp_ctx))) {
  85                 domain_dn = ldb_get_default_basedn(sam_ctx);
  86         }
  87
  88         if (domain_dn) {
  89                 ret = ldb_search(sam_ctx, mem_ctx, &dom_res,
  90                                  domain_dn, LDB_SCOPE_BASE, dom_attrs,
  91                                  "objectClass=domain");
  92                 if (ret != LDB_SUCCESS) {
  93                         DEBUG(2,("Error finding domain '%s'/'%s' in sam: %s\n", domain, ldb_dn_get_linearized(domain_dn), ldb_errstring(sam_ctx)));
  94                         return NT_STATUS_NO_SUCH_DOMAIN;
  95                 }
  96                 if (dom_res->count != 1) {
  97                         DEBUG(2,("Error finding domain '%s'/'%s' in sam\n", domain, ldb_dn_get_linearized(domain_dn)));
  98                         return NT_STATUS_NO_SUCH_DOMAIN;
  99                 }
 100         }
 101
 102         if ((dom_res == NULL || dom_res->count == 0) && (domain_guid || domain_sid)) {
 103
 104                 if (domain_guid) {
 105                         struct GUID binary_guid;
 106                         struct ldb_val guid_val;
 107                         enum ndr_err_code ndr_err;
 108
 109                         /* By this means, we ensure we don't have funny stuff in the GUID */
 110
 111                         status = GUID_from_string(domain_guid, &binary_guid);
 112                         if (!NT_STATUS_IS_OK(status)) {
 113                                 return status;
 114                         }
 115
 116                         /* And this gets the result into the binary format we want anyway */
 117                         ndr_err = ndr_push_struct_blob(&guid_val, mem_ctx, NULL, &binary_guid,
 118                                                        (ndr_push_flags_fn_t)ndr_push_GUID);
 119                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 120                                 return NT_STATUS_INVALID_PARAMETER;
 121                         }
 122                         ret = ldb_search(sam_ctx, mem_ctx, &dom_res,
 123                                                  NULL, LDB_SCOPE_SUBTREE,
 124                                                  dom_attrs,
 125                                                  "(&(objectCategory=DomainDNS)(objectGUID=%s))",
 126                                                  ldb_binary_encode(mem_ctx, guid_val));
 127                 } else { /* domain_sid case */
 128                         struct dom_sid *sid;
 129                         struct ldb_val sid_val;
 130                         enum ndr_err_code ndr_err;
 131
 132                         /* Rather than go via the string, just push into the NDR form */
 133                         ndr_err = ndr_push_struct_blob(&sid_val, mem_ctx, NULL, &sid,
 134                                                        (ndr_push_flags_fn_t)ndr_push_dom_sid);
 135                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 136                                 return NT_STATUS_INVALID_PARAMETER;
 137                         }
 138
 139                         ret = ldb_search(sam_ctx, mem_ctx, &dom_res,
 140                                                  NULL, LDB_SCOPE_SUBTREE,
 141                                                  dom_attrs,
 142                                                  "(&(objectCategory=DomainDNS)(objectSID=%s))",
 143                                                  ldb_binary_encode(mem_ctx, sid_val));
 144                 }
 145
 146                 if (ret != LDB_SUCCESS) {
 147                         DEBUG(2,("Unable to find referece to GUID '%s' or SID %s in sam: %s\n",
 148                                  domain_guid, dom_sid_string(mem_ctx, domain_sid),
 149                                  ldb_errstring(sam_ctx)));
 150                         return NT_STATUS_NO_SUCH_DOMAIN;
 151                 } else if (dom_res->count == 1) {
 152                         /* Ok, now just check it is our domain */
 153
 154                         if (ldb_dn_compare(ldb_get_default_basedn(sam_ctx), dom_res->msgs[0]->dn) != 0) {
 155                                 return NT_STATUS_NO_SUCH_DOMAIN;
 156                         }
 157                 } else if (dom_res->count > 1) {
 158                         return NT_STATUS_NO_SUCH_DOMAIN;
 159                 }
 160         }
 161
 162
 163         if ((dom_res == NULL || dom_res->count == 0)) {
 164                 DEBUG(2,("Unable to find domain with name %s or GUID {%s}\n", domain, domain_guid));
 165                 return NT_STATUS_NO_SUCH_DOMAIN;
 166         }
 167
 168         /* work around different inputs for not-specified users */
 169         if (!user) {
 170                 user = "";
 171         }
 172
 173         /* Enquire about any valid username with just a CLDAP packet -
 174          * if kerberos didn't also do this, the security folks would
 175          * scream... */
 176         if (user[0]) {                                                  \
 177                 /* Only allow some bits to be enquired:  [MS-ATDS] 7.3.3.2 */
 178                 if (acct_control == (uint32_t)-1) {
 179                         acct_control = 0;
 180                 }
 181                 acct_control = acct_control & (ACB_TEMPDUP | ACB_NORMAL | ACB_DOMTRUST | ACB_WSTRUST | ACB_SVRTRUST);
 182
 183                 /* We must exclude disabled accounts, but otherwise do the bitwise match the client asked for */
 184                 ret = ldb_search(sam_ctx, mem_ctx, &user_res,
 185                                          dom_res->msgs[0]->dn, LDB_SCOPE_SUBTREE,
 186                                          none_attrs,
 187                                          "(&(objectClass=user)(samAccountName=%s)"
 188                                          "(!(userAccountControl:" LDB_OID_COMPARATOR_AND ":=%u))"
 189                                          "(userAccountControl:" LDB_OID_COMPARATOR_OR ":=%u))",
 190                                          ldb_binary_encode_string(mem_ctx, user),
 191                                          UF_ACCOUNTDISABLE, ds_acb2uf(acct_control));
 192                 if (ret != LDB_SUCCESS) {
 193                         DEBUG(2,("Unable to find referece to user '%s' with ACB 0x%8x under %s: %s\n",
 194                                  user, acct_control, ldb_dn_get_linearized(dom_res->msgs[0]->dn),
 195                                  ldb_errstring(sam_ctx)));
 196                         return NT_STATUS_NO_SUCH_USER;
 197                 } else if (user_res->count == 1) {
 198                         user_known = true;
 199                 } else {
 200                         user_known = false;
 201                 }
 202
 203         } else {
 204                 user_known = true;
 205         }
 206
 207         server_type      =
 208                 DS_SERVER_DS | DS_SERVER_TIMESERV |
 209                 DS_SERVER_CLOSEST | DS_SERVER_WRITABLE |
 210                 DS_SERVER_GOOD_TIMESERV;
 211
 212 #if 0
 213         /* w2k8-r2 as a DC does not claim these */
 214         server_type |= DS_DNS_CONTROLLER | DS_DNS_DOMAIN;
 215 #endif
 216
 217         if (samdb_is_pdc(sam_ctx)) {
 218                 int *domainFunctionality;
 219                 server_type |= DS_SERVER_PDC;
 220                 domainFunctionality = talloc_get_type(ldb_get_opaque(sam_ctx, "domainFunctionality"), int);
 221                 if (domainFunctionality && *domainFunctionality >= DS_DOMAIN_FUNCTION_2008) {
 222                         server_type |= DS_SERVER_FULL_SECRET_DOMAIN_6;
 223                 }
 224         }
 225
 226         if (samdb_is_gc(sam_ctx)) {
 227                 server_type |= DS_SERVER_GC;
 228         }
 229
 230         if (str_list_check(services, "ldap")) {
 231                 server_type |= DS_SERVER_LDAP;
 232         }
 233
 234         if (str_list_check(services, "kdc")) {
 235                 server_type |= DS_SERVER_KDC;
 236         }
 237
 238 #if 0
 239         /* w2k8-r2 as a sole DC does not claim this */
 240         if (ldb_dn_compare(ldb_get_root_basedn(sam_ctx), ldb_get_default_basedn(sam_ctx)) == 0) {
 241                 server_type |= DS_DNS_FOREST_ROOT;
 242         }
 243 #endif
 244
 245         pdc_name         = talloc_asprintf(mem_ctx, "\\\\%s", lp_netbios_name(lp_ctx));
 246         domain_uuid      = samdb_result_guid(dom_res->msgs[0], "objectGUID");
 247         dns_domain       = lp_dnsdomain(lp_ctx);
 248         pdc_dns_name     = talloc_asprintf(mem_ctx, "%s.%s",
 249                                            strlower_talloc(mem_ctx,
 250                                                            lp_netbios_name(lp_ctx)),
 251                                            dns_domain);
 252
 253         flatname         = lp_sam_name(lp_ctx);
 254         server_site      = samdb_server_site_name(sam_ctx, mem_ctx);
 255         /* FIXME: Hardcoded site name */
 256         client_site      = "Default-First-Site-Name";
 257         load_interfaces(mem_ctx, lp_interfaces(lp_ctx), &ifaces);
 258         pdc_ip           = iface_best_ip(ifaces, src_address);
 259
 260         ZERO_STRUCTP(netlogon);
 261
 262         /* check if either of these bits is present */
 263         if (version & (NETLOGON_NT_VERSION_5EX|NETLOGON_NT_VERSION_5EX_WITH_IP)) {
 264                 uint32_t extra_flags = 0;
 265                 netlogon->ntver = NETLOGON_NT_VERSION_5EX;
 266
 267                 /* could check if the user exists */
 268                 if (user_known) {
 269                         netlogon->data.nt5_ex.command      = LOGON_SAM_LOGON_RESPONSE_EX;
 270                 } else {
 271                         netlogon->data.nt5_ex.command      = LOGON_SAM_LOGON_USER_UNKNOWN_EX;
 272                 }
 273                 netlogon->data.nt5_ex.server_type  = server_type;
 274                 netlogon->data.nt5_ex.domain_uuid  = domain_uuid;
 275                 netlogon->data.nt5_ex.forest       = dns_domain;
 276                 netlogon->data.nt5_ex.dns_domain   = dns_domain;
 277                 netlogon->data.nt5_ex.pdc_dns_name = pdc_dns_name;
 278                 netlogon->data.nt5_ex.domain       = flatname;
 279                 netlogon->data.nt5_ex.pdc_name     = lp_netbios_name(lp_ctx);
 280                 netlogon->data.nt5_ex.user_name    = user;
 281                 netlogon->data.nt5_ex.server_site  = server_site;
 282                 netlogon->data.nt5_ex.client_site  = client_site;
 283
 284                 if (version & NETLOGON_NT_VERSION_5EX_WITH_IP) {
 285                         /* Clearly this needs to be fixed up for IPv6 */
 286                         extra_flags = NETLOGON_NT_VERSION_5EX_WITH_IP;
 287                         netlogon->data.nt5_ex.sockaddr.sockaddr_family    = 2;
 288                         netlogon->data.nt5_ex.sockaddr.pdc_ip       = pdc_ip;
 289                         netlogon->data.nt5_ex.sockaddr.remaining = data_blob_talloc_zero(mem_ctx, 8);
 290                 }
 291                 netlogon->data.nt5_ex.nt_version   = NETLOGON_NT_VERSION_1|NETLOGON_NT_VERSION_5EX|extra_flags;
 292                 netlogon->data.nt5_ex.lmnt_token   = 0xFFFF;
 293                 netlogon->data.nt5_ex.lm20_token   = 0xFFFF;
 294
 295         } else if (version & NETLOGON_NT_VERSION_5) {
 296                 netlogon->ntver = NETLOGON_NT_VERSION_5;
 297
 298                 /* could check if the user exists */
 299                 if (user_known) {
 300                         netlogon->data.nt5.command      = LOGON_SAM_LOGON_RESPONSE;
 301                 } else {
 302                         netlogon->data.nt5.command      = LOGON_SAM_LOGON_USER_UNKNOWN;
 303                 }
 304                 netlogon->data.nt5.pdc_name     = pdc_name;
 305                 netlogon->data.nt5.user_name    = user;
 306                 netlogon->data.nt5.domain_name  = flatname;
 307                 netlogon->data.nt5.domain_uuid  = domain_uuid;
 308                 netlogon->data.nt5.forest       = dns_domain;
 309                 netlogon->data.nt5.dns_domain   = dns_domain;
 310                 netlogon->data.nt5.pdc_dns_name = pdc_dns_name;
 311                 netlogon->data.nt5.pdc_ip       = pdc_ip;
 312                 netlogon->data.nt5.server_type  = server_type;
 313                 netlogon->data.nt5.nt_version   = NETLOGON_NT_VERSION_1|NETLOGON_NT_VERSION_5;
 314                 netlogon->data.nt5.lmnt_token   = 0xFFFF;
 315                 netlogon->data.nt5.lm20_token   = 0xFFFF;
 316
 317         } else /* (version & NETLOGON_NT_VERSION_1) and all other cases */ {
 318                 netlogon->ntver = NETLOGON_NT_VERSION_1;
 319                 /* could check if the user exists */
 320                 if (user_known) {
 321                         netlogon->data.nt4.command      = LOGON_SAM_LOGON_RESPONSE;
 322                 } else {
 323                         netlogon->data.nt4.command      = LOGON_SAM_LOGON_USER_UNKNOWN;
 324                 }
 325                 netlogon->data.nt4.server      = pdc_name;
 326                 netlogon->data.nt4.user_name   = user;
 327                 netlogon->data.nt4.domain      = flatname;
 328                 netlogon->data.nt4.nt_version  = NETLOGON_NT_VERSION_1;
 329                 netlogon->data.nt4.lmnt_token  = 0xFFFF;
 330                 netlogon->data.nt4.lm20_token  = 0xFFFF;
 331         }
 332
 333         return NT_STATUS_OK;
 334 }
 335
 336
 337 /*
 338   handle incoming cldap requests
 339 */
 340 void cldapd_netlogon_request(struct cldap_socket *cldap,
 341                              struct cldapd_server *cldapd,
 342                              TALLOC_CTX *tmp_ctx,
 343                              uint32_t message_id,
 344                              struct ldb_parse_tree *tree,
 345                              struct tsocket_address *src)
 346 {
 347         int i;
 348         const char *domain = NULL;
 349         const char *host = NULL;
 350         const char *user = NULL;
 351         const char *domain_guid = NULL;
 352         const char *domain_sid = NULL;
 353         int acct_control = -1;
 354         int version = -1;
 355         struct netlogon_samlogon_response netlogon;
 356         NTSTATUS status = NT_STATUS_INVALID_PARAMETER;
 357
 358         if (tree->operation != LDB_OP_AND) goto failed;
 359
 360         /* extract the query elements */
 361         for (i=0;i<tree->u.list.num_elements;i++) {
 362                 struct ldb_parse_tree *t = tree->u.list.elements[i];
 363                 if (t->operation != LDB_OP_EQUALITY) goto failed;
 364                 if (strcasecmp(t->u.equality.attr, "DnsDomain") == 0) {
 365                         domain = talloc_strndup(tmp_ctx,
 366                                                 (const char *)t->u.equality.value.data,
 367                                                 t->u.equality.value.length);
 368                 }
 369                 if (strcasecmp(t->u.equality.attr, "Host") == 0) {
 370                         host = talloc_strndup(tmp_ctx,
 371                                               (const char *)t->u.equality.value.data,
 372                                               t->u.equality.value.length);
 373                 }
 374                 if (strcasecmp(t->u.equality.attr, "DomainGuid") == 0) {
 375                         NTSTATUS enc_status;
 376                         struct GUID guid;
 377                         enc_status = ldap_decode_ndr_GUID(tmp_ctx,
 378                                                           t->u.equality.value, &guid);
 379                         if (NT_STATUS_IS_OK(enc_status)) {
 380                                 domain_guid = GUID_string(tmp_ctx, &guid);
 381                         }
 382                 }
 383                 if (strcasecmp(t->u.equality.attr, "DomainSid") == 0) {
 384                         domain_sid = talloc_strndup(tmp_ctx,
 385                                                     (const char *)t->u.equality.value.data,
 386                                                     t->u.equality.value.length);
 387                 }
 388                 if (strcasecmp(t->u.equality.attr, "User") == 0) {
 389                         user = talloc_strndup(tmp_ctx,
 390                                               (const char *)t->u.equality.value.data,
 391                                               t->u.equality.value.length);
 392                 }
 393                 if (strcasecmp(t->u.equality.attr, "NtVer") == 0 &&
 394                     t->u.equality.value.length == 4) {
 395                         version = IVAL(t->u.equality.value.data, 0);
 396                 }
 397                 if (strcasecmp(t->u.equality.attr, "AAC") == 0 &&
 398                     t->u.equality.value.length == 4) {
 399                         acct_control = IVAL(t->u.equality.value.data, 0);
 400                 }
 401         }
 402
 403         if (domain_guid == NULL && domain == NULL) {
 404                 domain = lp_dnsdomain(cldapd->task->lp_ctx);
 405         }
 406
 407         if (version == -1) {
 408                 goto failed;
 409         }
 410
 411         DEBUG(5,("cldap netlogon query domain=%s host=%s user=%s version=%d guid=%s\n",
 412                  domain, host, user, version, domain_guid));
 413
 414         status = fill_netlogon_samlogon_response(cldapd->samctx, tmp_ctx, domain, NULL, NULL, domain_guid,
 415                                                  user, acct_control,
 416                                                  tsocket_address_inet_addr_string(src, tmp_ctx),
 417                                                  version, cldapd->task->lp_ctx, &netlogon);
 418         if (!NT_STATUS_IS_OK(status)) {
 419                 goto failed;
 420         }
 421
 422         status = cldap_netlogon_reply(cldap,
 423                                       lp_iconv_convenience(cldapd->task->lp_ctx),
 424                                       message_id, src, version,
 425                                       &netlogon);
 426         if (!NT_STATUS_IS_OK(status)) {
 427                 goto failed;
 428         }
 429
 430         return;
 431
 432 failed:
 433         DEBUG(2,("cldap netlogon query failed domain=%s host=%s version=%d - %s\n",
 434                  domain, host, version, nt_errstr(status)));
 435         cldap_empty_reply(cldap, message_id, src);
 436 }