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                                          bool fill_on_blank_request)
  56 {
  57         const char *dom_attrs[] = {"objectGUID", NULL};
  58         const char *none_attrs[] = {NULL};
  59         struct ldb_result *dom_res = NULL, *user_res = NULL;
  60         int ret;
  61         const char **services = lp_server_services(lp_ctx);
  62         uint32_t server_type;
  63         const char *pdc_name;
  64         struct GUID domain_uuid;
  65         const char *dns_domain;
  66         const char *forest_domain;
  67         const char *pdc_dns_name;
  68         const char *flatname;
  69         const char *server_site;
  70         const char *client_site;
  71         const char *pdc_ip;
  72         struct ldb_dn *domain_dn = NULL;
  73         struct interface *ifaces;
  74         bool user_known;
  75         NTSTATUS status;
  76
  77         /* the domain parameter could have an optional trailing "." */
  78         if (domain && domain[strlen(domain)-1] == '.') {
  79                 domain = talloc_strndup(mem_ctx, domain, strlen(domain)-1);
  80                 NT_STATUS_HAVE_NO_MEMORY(domain);
  81         }
  82
  83         /* Lookup using long or short domainname */
  84         if (domain && (strcasecmp_m(domain, lp_dnsdomain(lp_ctx)) == 0)) {
  85                 domain_dn = ldb_get_default_basedn(sam_ctx);
  86         }
  87         if (netbios_domain && (strcasecmp_m(netbios_domain, lp_sam_name(lp_ctx)) == 0)) {
  88                 domain_dn = ldb_get_default_basedn(sam_ctx);
  89         }
  90         if (domain_dn) {
  91                 const char *domain_identifier = domain != NULL ? domain
  92                                                         : netbios_domain;
  93                 ret = ldb_search(sam_ctx, mem_ctx, &dom_res,
  94                                  domain_dn, LDB_SCOPE_BASE, dom_attrs,
  95                                  "objectClass=domain");
  96                 if (ret != LDB_SUCCESS) {
  97                         DEBUG(2,("Error finding domain '%s'/'%s' in sam: %s\n",
  98                                  domain_identifier,
  99                                  ldb_dn_get_linearized(domain_dn),
 100                                  ldb_errstring(sam_ctx)));
 101                         return NT_STATUS_NO_SUCH_DOMAIN;
 102                 }
 103                 if (dom_res->count != 1) {
 104                         DEBUG(2,("Error finding domain '%s'/'%s' in sam\n",
 105                                  domain_identifier,
 106                                  ldb_dn_get_linearized(domain_dn)));
 107                         return NT_STATUS_NO_SUCH_DOMAIN;
 108                 }
 109         }
 110
 111         /* Lookup using GUID or SID */
 112         if ((dom_res == NULL) && (domain_guid || domain_sid)) {
 113                 if (domain_guid) {
 114                         struct GUID binary_guid;
 115                         struct ldb_val guid_val;
 116
 117                         /* By this means, we ensure we don't have funny stuff in the GUID */
 118
 119                         status = GUID_from_string(domain_guid, &binary_guid);
 120                         if (!NT_STATUS_IS_OK(status)) {
 121                                 return status;
 122                         }
 123
 124                         /* And this gets the result into the binary format we want anyway */
 125                         status = GUID_to_ndr_blob(&binary_guid, mem_ctx, &guid_val);
 126                         if (!NT_STATUS_IS_OK(status)) {
 127                                 return status;
 128                         }
 129                         ret = ldb_search(sam_ctx, mem_ctx, &dom_res,
 130                                                  NULL, LDB_SCOPE_SUBTREE,
 131                                                  dom_attrs,
 132                                                  "(&(objectCategory=DomainDNS)(objectGUID=%s))",
 133                                                  ldb_binary_encode(mem_ctx, guid_val));
 134                 } else { /* domain_sid case */
 135                         struct dom_sid *sid;
 136                         struct ldb_val sid_val;
 137                         enum ndr_err_code ndr_err;
 138
 139                         /* Rather than go via the string, just push into the NDR form */
 140                         ndr_err = ndr_push_struct_blob(&sid_val, mem_ctx, &sid,
 141                                                        (ndr_push_flags_fn_t)ndr_push_dom_sid);
 142                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 143                                 return NT_STATUS_INVALID_PARAMETER;
 144                         }
 145
 146                         ret = ldb_search(sam_ctx, mem_ctx, &dom_res,
 147                                                  NULL, LDB_SCOPE_SUBTREE,
 148                                                  dom_attrs,
 149                                                  "(&(objectCategory=DomainDNS)(objectSID=%s))",
 150                                                  ldb_binary_encode(mem_ctx, sid_val));
 151                 }
 152
 153                 if (ret != LDB_SUCCESS) {
 154                         DEBUG(2,("Unable to find a correct reference to GUID '%s' or SID '%s' in sam: %s\n",
 155                                  domain_guid, dom_sid_string(mem_ctx, domain_sid),
 156                                  ldb_errstring(sam_ctx)));
 157                         return NT_STATUS_NO_SUCH_DOMAIN;
 158                 } else if (dom_res->count == 1) {
 159                         /* Ok, now just check it is our domain */
 160                         if (ldb_dn_compare(ldb_get_default_basedn(sam_ctx),
 161                                            dom_res->msgs[0]->dn) != 0) {
 162                                 DEBUG(2,("The GUID '%s' or SID '%s' doesn't identify our domain\n",
 163                                          domain_guid,
 164                                          dom_sid_string(mem_ctx, domain_sid)));
 165                                 return NT_STATUS_NO_SUCH_DOMAIN;
 166                         }
 167                 } else {
 168                         DEBUG(2,("Unable to find a correct reference to GUID '%s' or SID '%s' in sam\n",
 169                                  domain_guid, dom_sid_string(mem_ctx, domain_sid)));
 170                         return NT_STATUS_NO_SUCH_DOMAIN;
 171                 }
 172         }
 173
 174         if (dom_res == NULL && fill_on_blank_request) {
 175                 /* blank inputs gives our domain - tested against
 176                    w2k8r2. Without this ADUC on Win7 won't start */
 177                 domain_dn = ldb_get_default_basedn(sam_ctx);
 178                 ret = ldb_search(sam_ctx, mem_ctx, &dom_res,
 179                                  domain_dn, LDB_SCOPE_BASE, dom_attrs,
 180                                  "objectClass=domain");
 181                 if (ret != LDB_SUCCESS) {
 182                         DEBUG(2,("Error finding domain '%s'/'%s' in sam: %s\n",
 183                                  lp_dnsdomain(lp_ctx),
 184                                  ldb_dn_get_linearized(domain_dn),
 185                                  ldb_errstring(sam_ctx)));
 186                         return NT_STATUS_NO_SUCH_DOMAIN;
 187                 }
 188         }
 189
 190         if (dom_res == NULL) {
 191                 DEBUG(2,(__location__ ": Unable to get domain informations with no inputs\n"));
 192                 return NT_STATUS_NO_SUCH_DOMAIN;
 193         }
 194
 195         /* work around different inputs for not-specified users */
 196         if (!user) {
 197                 user = "";
 198         }
 199
 200         /* Enquire about any valid username with just a CLDAP packet -
 201          * if kerberos didn't also do this, the security folks would
 202          * scream... */
 203         if (user[0]) {                                                  \
 204                 /* Only allow some bits to be enquired:  [MS-ATDS] 7.3.3.2 */
 205                 if (acct_control == (uint32_t)-1) {
 206                         acct_control = 0;
 207                 }
 208                 acct_control = acct_control & (ACB_TEMPDUP | ACB_NORMAL | ACB_DOMTRUST | ACB_WSTRUST | ACB_SVRTRUST);
 209
 210                 /* We must exclude disabled accounts, but otherwise do the bitwise match the client asked for */
 211                 ret = ldb_search(sam_ctx, mem_ctx, &user_res,
 212                                          dom_res->msgs[0]->dn, LDB_SCOPE_SUBTREE,
 213                                          none_attrs,
 214                                          "(&(objectClass=user)(samAccountName=%s)"
 215                                          "(!(userAccountControl:" LDB_OID_COMPARATOR_AND ":=%u))"
 216                                          "(userAccountControl:" LDB_OID_COMPARATOR_OR ":=%u))",
 217                                          ldb_binary_encode_string(mem_ctx, user),
 218                                          UF_ACCOUNTDISABLE, ds_acb2uf(acct_control));
 219                 if (ret != LDB_SUCCESS) {
 220                         DEBUG(2,("Unable to find reference to user '%s' with ACB 0x%8x under %s: %s\n",
 221                                  user, acct_control, ldb_dn_get_linearized(dom_res->msgs[0]->dn),
 222                                  ldb_errstring(sam_ctx)));
 223                         return NT_STATUS_NO_SUCH_USER;
 224                 } else if (user_res->count == 1) {
 225                         user_known = true;
 226                 } else {
 227                         user_known = false;
 228                 }
 229
 230         } else {
 231                 user_known = true;
 232         }
 233
 234         server_type      =
 235                 DS_SERVER_DS | DS_SERVER_TIMESERV |
 236                 DS_SERVER_CLOSEST | DS_SERVER_WRITABLE |
 237                 DS_SERVER_GOOD_TIMESERV;
 238
 239 #if 0
 240         /* w2k8-r2 as a DC does not claim these */
 241         server_type |= DS_DNS_CONTROLLER | DS_DNS_DOMAIN;
 242 #endif
 243
 244         if (samdb_is_pdc(sam_ctx)) {
 245                 server_type |= DS_SERVER_PDC;
 246         }
 247
 248         if (dsdb_functional_level(sam_ctx) >= DS_DOMAIN_FUNCTION_2008) {
 249                 server_type |= DS_SERVER_FULL_SECRET_DOMAIN_6;
 250         }
 251
 252         if (samdb_is_gc(sam_ctx)) {
 253                 server_type |= DS_SERVER_GC;
 254         }
 255
 256         if (str_list_check(services, "ldap")) {
 257                 server_type |= DS_SERVER_LDAP;
 258         }
 259
 260         if (str_list_check(services, "kdc")) {
 261                 server_type |= DS_SERVER_KDC;
 262         }
 263
 264 #if 0
 265         /* w2k8-r2 as a sole DC does not claim this */
 266         if (ldb_dn_compare(ldb_get_root_basedn(sam_ctx), ldb_get_default_basedn(sam_ctx)) == 0) {
 267                 server_type |= DS_DNS_FOREST_ROOT;
 268         }
 269 #endif
 270
 271         pdc_name         = talloc_asprintf(mem_ctx, "\\\\%s",
 272                                            lp_netbios_name(lp_ctx));
 273         NT_STATUS_HAVE_NO_MEMORY(pdc_name);
 274         domain_uuid      = samdb_result_guid(dom_res->msgs[0], "objectGUID");
 275         dns_domain       = lp_dnsdomain(lp_ctx);
 276         forest_domain    = samdb_forest_name(sam_ctx, mem_ctx);
 277         NT_STATUS_HAVE_NO_MEMORY(forest_domain);
 278         pdc_dns_name     = talloc_asprintf(mem_ctx, "%s.%s",
 279                                            strlower_talloc(mem_ctx,
 280                                                            lp_netbios_name(lp_ctx)),
 281                                            dns_domain);
 282         NT_STATUS_HAVE_NO_MEMORY(pdc_dns_name);
 283         flatname         = lp_workgroup(lp_ctx);
 284         server_site      = samdb_server_site_name(sam_ctx, mem_ctx);
 285         NT_STATUS_HAVE_NO_MEMORY(server_site);
 286         client_site      = samdb_client_site_name(sam_ctx, mem_ctx,
 287                                                   src_address, NULL);
 288         NT_STATUS_HAVE_NO_MEMORY(client_site);
 289         load_interfaces(mem_ctx, lp_interfaces(lp_ctx), &ifaces);
 290         /*
 291          * TODO: the caller should pass the address which the client
 292          * used to trigger this call, as the client is able to reach
 293          * this ip.
 294          */
 295         if (src_address) {
 296                 pdc_ip = iface_best_ip(ifaces, src_address);
 297         } else {
 298                 pdc_ip = iface_n_ip(ifaces, 0);
 299         }
 300         ZERO_STRUCTP(netlogon);
 301
 302         /* check if either of these bits is present */
 303         if (version & (NETLOGON_NT_VERSION_5EX|NETLOGON_NT_VERSION_5EX_WITH_IP)) {
 304                 uint32_t extra_flags = 0;
 305                 netlogon->ntver = NETLOGON_NT_VERSION_5EX;
 306
 307                 /* could check if the user exists */
 308                 if (user_known) {
 309                         netlogon->data.nt5_ex.command      = LOGON_SAM_LOGON_RESPONSE_EX;
 310                 } else {
 311                         netlogon->data.nt5_ex.command      = LOGON_SAM_LOGON_USER_UNKNOWN_EX;
 312                 }
 313                 netlogon->data.nt5_ex.pdc_name     = pdc_name;
 314                 netlogon->data.nt5_ex.user_name    = user;
 315                 netlogon->data.nt5_ex.domain_name  = flatname;
 316                 netlogon->data.nt5_ex.domain_uuid  = domain_uuid;
 317                 netlogon->data.nt5_ex.forest       = forest_domain;
 318                 netlogon->data.nt5_ex.dns_domain   = dns_domain;
 319                 netlogon->data.nt5_ex.pdc_dns_name = pdc_dns_name;
 320                 netlogon->data.nt5_ex.server_site  = server_site;
 321                 netlogon->data.nt5_ex.client_site  = client_site;
 322                 if (version & NETLOGON_NT_VERSION_5EX_WITH_IP) {
 323                         /* Clearly this needs to be fixed up for IPv6 */
 324                         extra_flags = NETLOGON_NT_VERSION_5EX_WITH_IP;
 325                         netlogon->data.nt5_ex.sockaddr.sockaddr_family    = 2;
 326                         netlogon->data.nt5_ex.sockaddr.pdc_ip       = pdc_ip;
 327                         netlogon->data.nt5_ex.sockaddr.remaining = data_blob_talloc_zero(mem_ctx, 8);
 328                 }
 329                 netlogon->data.nt5_ex.server_type  = server_type;
 330                 netlogon->data.nt5_ex.nt_version   = NETLOGON_NT_VERSION_1|NETLOGON_NT_VERSION_5EX|extra_flags;
 331                 netlogon->data.nt5_ex.lmnt_token   = 0xFFFF;
 332                 netlogon->data.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->data.nt5.command      = LOGON_SAM_LOGON_RESPONSE;
 340                 } else {
 341                         netlogon->data.nt5.command      = LOGON_SAM_LOGON_USER_UNKNOWN;
 342                 }
 343                 netlogon->data.nt5.pdc_name     = pdc_name;
 344                 netlogon->data.nt5.user_name    = user;
 345                 netlogon->data.nt5.domain_name  = flatname;
 346                 netlogon->data.nt5.domain_uuid  = domain_uuid;
 347                 netlogon->data.nt5.forest       = forest_domain;
 348                 netlogon->data.nt5.dns_domain   = dns_domain;
 349                 netlogon->data.nt5.pdc_dns_name = pdc_dns_name;
 350                 netlogon->data.nt5.pdc_ip       = pdc_ip;
 351                 netlogon->data.nt5.server_type  = server_type;
 352                 netlogon->data.nt5.nt_version   = NETLOGON_NT_VERSION_1|NETLOGON_NT_VERSION_5;
 353                 netlogon->data.nt5.lmnt_token   = 0xFFFF;
 354                 netlogon->data.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->data.nt4.command      = LOGON_SAM_LOGON_RESPONSE;
 361                 } else {
 362                         netlogon->data.nt4.command      = LOGON_SAM_LOGON_USER_UNKNOWN;
 363                 }
 364                 netlogon->data.nt4.pdc_name    = pdc_name;
 365                 netlogon->data.nt4.user_name   = user;
 366                 netlogon->data.nt4.domain_name = flatname;
 367                 netlogon->data.nt4.nt_version  = NETLOGON_NT_VERSION_1;
 368                 netlogon->data.nt4.lmnt_token  = 0xFFFF;
 369                 netlogon->data.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                              struct cldapd_server *cldapd,
 381                              TALLOC_CTX *tmp_ctx,
 382                              uint32_t message_id,
 383                              struct ldb_parse_tree *tree,
 384                              struct tsocket_address *src)
 385 {
 386         unsigned int i;
 387         const char *domain = NULL;
 388         const char *host = NULL;
 389         const char *user = NULL;
 390         const char *domain_guid = NULL;
 391         struct dom_sid *domain_sid = NULL;
 392         int acct_control = -1;
 393         int version = -1;
 394         struct netlogon_samlogon_response netlogon;
 395         NTSTATUS status = NT_STATUS_INVALID_PARAMETER;
 396
 397         if (tree->operation != LDB_OP_AND) goto failed;
 398
 399         /* extract the query elements */
 400         for (i=0;i<tree->u.list.num_elements;i++) {
 401                 struct ldb_parse_tree *t = tree->u.list.elements[i];
 402                 if (t->operation != LDB_OP_EQUALITY) goto failed;
 403                 if (strcasecmp(t->u.equality.attr, "DnsDomain") == 0) {
 404                         domain = talloc_strndup(tmp_ctx,
 405                                                 (const char *)t->u.equality.value.data,
 406                                                 t->u.equality.value.length);
 407                 }
 408                 if (strcasecmp(t->u.equality.attr, "Host") == 0) {
 409                         host = talloc_strndup(tmp_ctx,
 410                                               (const char *)t->u.equality.value.data,
 411                                               t->u.equality.value.length);
 412                 }
 413                 if (strcasecmp(t->u.equality.attr, "DomainGuid") == 0) {
 414                         NTSTATUS enc_status;
 415                         struct GUID guid;
 416                         enc_status = ldap_decode_ndr_GUID(tmp_ctx,
 417                                                           t->u.equality.value, &guid);
 418                         if (NT_STATUS_IS_OK(enc_status)) {
 419                                 domain_guid = GUID_string(tmp_ctx, &guid);
 420                         }
 421                 }
 422                 if (strcasecmp(t->u.equality.attr, "DomainSid") == 0) {
 423                         enum ndr_err_code ndr_err;
 424
 425                         domain_sid = talloc(tmp_ctx, struct dom_sid);
 426                         if (domain_sid == NULL) {
 427                                 goto failed;
 428                         }
 429                         ndr_err = ndr_pull_struct_blob(&t->u.equality.value,
 430                                                        domain_sid, domain_sid,
 431                                                        (ndr_pull_flags_fn_t)ndr_pull_dom_sid);
 432                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 433                                 talloc_free(domain_sid);
 434                                 goto failed;
 435                         }
 436                 }
 437                 if (strcasecmp(t->u.equality.attr, "User") == 0) {
 438                         user = talloc_strndup(tmp_ctx,
 439                                               (const char *)t->u.equality.value.data,
 440                                               t->u.equality.value.length);
 441                 }
 442                 if (strcasecmp(t->u.equality.attr, "NtVer") == 0 &&
 443                     t->u.equality.value.length == 4) {
 444                         version = IVAL(t->u.equality.value.data, 0);
 445                 }
 446                 if (strcasecmp(t->u.equality.attr, "AAC") == 0 &&
 447                     t->u.equality.value.length == 4) {
 448                         acct_control = IVAL(t->u.equality.value.data, 0);
 449                 }
 450         }
 451
 452         if ((domain == NULL) && (domain_guid == NULL) && (domain_sid == NULL)) {
 453                 domain = lp_dnsdomain(cldapd->task->lp_ctx);
 454         }
 455
 456         if (version == -1) {
 457                 goto failed;
 458         }
 459
 460         DEBUG(5,("cldap netlogon query domain=%s host=%s user=%s version=%d guid=%s\n",
 461                  domain, host, user, version, domain_guid));
 462
 463         status = fill_netlogon_samlogon_response(cldapd->samctx, tmp_ctx,
 464                                                  domain, NULL, domain_sid,
 465                                                  domain_guid,
 466                                                  user, acct_control,
 467                                                  tsocket_address_inet_addr_string(src, tmp_ctx),
 468                                                  version, cldapd->task->lp_ctx,
 469                                                  &netlogon, false);
 470         if (!NT_STATUS_IS_OK(status)) {
 471                 goto failed;
 472         }
 473
 474         status = cldap_netlogon_reply(cldap, message_id, src, version, &netlogon);
 475         if (!NT_STATUS_IS_OK(status)) {
 476                 goto failed;
 477         }
 478
 479         return;
 480
 481 failed:
 482         DEBUG(2,("cldap netlogon query failed domain=%s host=%s version=%d - %s\n",
 483                  domain, host, version, nt_errstr(status)));
 484         cldap_empty_reply(cldap, message_id, src);
 485 }