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 <ldb.h>
  25 #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 = lpcfg_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, am_rodc;
  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, lpcfg_dnsdomain(lp_ctx)) == 0)) {
  85                 domain_dn = ldb_get_default_basedn(sam_ctx);
  86         }
  87         if (netbios_domain && (strcasecmp_m(netbios_domain, lpcfg_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                                  lpcfg_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 |
 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 (samdb_rodc(sam_ctx, &am_rodc) == LDB_SUCCESS && !am_rodc) {
 265                 server_type |= DS_SERVER_WRITABLE;
 266         }
 267
 268 #if 0
 269         /* w2k8-r2 as a sole DC does not claim this */
 270         if (ldb_dn_compare(ldb_get_root_basedn(sam_ctx), ldb_get_default_basedn(sam_ctx)) == 0) {
 271                 server_type |= DS_DNS_FOREST_ROOT;
 272         }
 273 #endif
 274
 275         pdc_name         = talloc_asprintf(mem_ctx, "\\\\%s",
 276                                            lpcfg_netbios_name(lp_ctx));
 277         NT_STATUS_HAVE_NO_MEMORY(pdc_name);
 278         domain_uuid      = samdb_result_guid(dom_res->msgs[0], "objectGUID");
 279         dns_domain       = lpcfg_dnsdomain(lp_ctx);
 280         forest_domain    = samdb_forest_name(sam_ctx, mem_ctx);
 281         NT_STATUS_HAVE_NO_MEMORY(forest_domain);
 282         pdc_dns_name     = talloc_asprintf(mem_ctx, "%s.%s",
 283                                            strlower_talloc(mem_ctx,
 284                                                            lpcfg_netbios_name(lp_ctx)),
 285                                            dns_domain);
 286         NT_STATUS_HAVE_NO_MEMORY(pdc_dns_name);
 287         flatname         = lpcfg_workgroup(lp_ctx);
 288         server_site      = samdb_server_site_name(sam_ctx, mem_ctx);
 289         NT_STATUS_HAVE_NO_MEMORY(server_site);
 290         client_site      = samdb_client_site_name(sam_ctx, mem_ctx,
 291                                                   src_address, NULL);
 292         NT_STATUS_HAVE_NO_MEMORY(client_site);
 293         load_interfaces(mem_ctx, lpcfg_interfaces(lp_ctx), &ifaces);
 294         /*
 295          * TODO: the caller should pass the address which the client
 296          * used to trigger this call, as the client is able to reach
 297          * this ip.
 298          */
 299         if (src_address) {
 300                 pdc_ip = iface_best_ip(ifaces, src_address);
 301         } else {
 302                 pdc_ip = iface_n_ip(ifaces, 0);
 303         }
 304         ZERO_STRUCTP(netlogon);
 305
 306         /* check if either of these bits is present */
 307         if (version & (NETLOGON_NT_VERSION_5EX|NETLOGON_NT_VERSION_5EX_WITH_IP)) {
 308                 uint32_t extra_flags = 0;
 309                 netlogon->ntver = NETLOGON_NT_VERSION_5EX;
 310
 311                 /* could check if the user exists */
 312                 if (user_known) {
 313                         netlogon->data.nt5_ex.command      = LOGON_SAM_LOGON_RESPONSE_EX;
 314                 } else {
 315                         netlogon->data.nt5_ex.command      = LOGON_SAM_LOGON_USER_UNKNOWN_EX;
 316                 }
 317                 netlogon->data.nt5_ex.pdc_name     = pdc_name;
 318                 netlogon->data.nt5_ex.user_name    = user;
 319                 netlogon->data.nt5_ex.domain_name  = flatname;
 320                 netlogon->data.nt5_ex.domain_uuid  = domain_uuid;
 321                 netlogon->data.nt5_ex.forest       = forest_domain;
 322                 netlogon->data.nt5_ex.dns_domain   = dns_domain;
 323                 netlogon->data.nt5_ex.pdc_dns_name = pdc_dns_name;
 324                 netlogon->data.nt5_ex.server_site  = server_site;
 325                 netlogon->data.nt5_ex.client_site  = client_site;
 326                 if (version & NETLOGON_NT_VERSION_5EX_WITH_IP) {
 327                         /* Clearly this needs to be fixed up for IPv6 */
 328                         extra_flags = NETLOGON_NT_VERSION_5EX_WITH_IP;
 329                         netlogon->data.nt5_ex.sockaddr.sockaddr_family    = 2;
 330                         netlogon->data.nt5_ex.sockaddr.pdc_ip       = pdc_ip;
 331                         netlogon->data.nt5_ex.sockaddr.remaining = data_blob_talloc_zero(mem_ctx, 8);
 332                 }
 333                 netlogon->data.nt5_ex.server_type  = server_type;
 334                 netlogon->data.nt5_ex.nt_version   = NETLOGON_NT_VERSION_1|NETLOGON_NT_VERSION_5EX|extra_flags;
 335                 netlogon->data.nt5_ex.lmnt_token   = 0xFFFF;
 336                 netlogon->data.nt5_ex.lm20_token   = 0xFFFF;
 337
 338         } else if (version & NETLOGON_NT_VERSION_5) {
 339                 netlogon->ntver = NETLOGON_NT_VERSION_5;
 340
 341                 /* could check if the user exists */
 342                 if (user_known) {
 343                         netlogon->data.nt5.command      = LOGON_SAM_LOGON_RESPONSE;
 344                 } else {
 345                         netlogon->data.nt5.command      = LOGON_SAM_LOGON_USER_UNKNOWN;
 346                 }
 347                 netlogon->data.nt5.pdc_name     = pdc_name;
 348                 netlogon->data.nt5.user_name    = user;
 349                 netlogon->data.nt5.domain_name  = flatname;
 350                 netlogon->data.nt5.domain_uuid  = domain_uuid;
 351                 netlogon->data.nt5.forest       = forest_domain;
 352                 netlogon->data.nt5.dns_domain   = dns_domain;
 353                 netlogon->data.nt5.pdc_dns_name = pdc_dns_name;
 354                 netlogon->data.nt5.pdc_ip       = pdc_ip;
 355                 netlogon->data.nt5.server_type  = server_type;
 356                 netlogon->data.nt5.nt_version   = NETLOGON_NT_VERSION_1|NETLOGON_NT_VERSION_5;
 357                 netlogon->data.nt5.lmnt_token   = 0xFFFF;
 358                 netlogon->data.nt5.lm20_token   = 0xFFFF;
 359
 360         } else /* (version & NETLOGON_NT_VERSION_1) and all other cases */ {
 361                 netlogon->ntver = NETLOGON_NT_VERSION_1;
 362                 /* could check if the user exists */
 363                 if (user_known) {
 364                         netlogon->data.nt4.command      = LOGON_SAM_LOGON_RESPONSE;
 365                 } else {
 366                         netlogon->data.nt4.command      = LOGON_SAM_LOGON_USER_UNKNOWN;
 367                 }
 368                 netlogon->data.nt4.pdc_name    = pdc_name;
 369                 netlogon->data.nt4.user_name   = user;
 370                 netlogon->data.nt4.domain_name = flatname;
 371                 netlogon->data.nt4.nt_version  = NETLOGON_NT_VERSION_1;
 372                 netlogon->data.nt4.lmnt_token  = 0xFFFF;
 373                 netlogon->data.nt4.lm20_token  = 0xFFFF;
 374         }
 375
 376         return NT_STATUS_OK;
 377 }
 378
 379
 380 /*
 381   handle incoming cldap requests
 382 */
 383 void cldapd_netlogon_request(struct cldap_socket *cldap,
 384                              struct cldapd_server *cldapd,
 385                              TALLOC_CTX *tmp_ctx,
 386                              uint32_t message_id,
 387                              struct ldb_parse_tree *tree,
 388                              struct tsocket_address *src)
 389 {
 390         unsigned int i;
 391         const char *domain = NULL;
 392         const char *host = NULL;
 393         const char *user = NULL;
 394         const char *domain_guid = NULL;
 395         struct dom_sid *domain_sid = NULL;
 396         int acct_control = -1;
 397         int version = -1;
 398         struct netlogon_samlogon_response netlogon;
 399         NTSTATUS status = NT_STATUS_INVALID_PARAMETER;
 400
 401         if (tree->operation != LDB_OP_AND) goto failed;
 402
 403         /* extract the query elements */
 404         for (i=0;i<tree->u.list.num_elements;i++) {
 405                 struct ldb_parse_tree *t = tree->u.list.elements[i];
 406                 if (t->operation != LDB_OP_EQUALITY) goto failed;
 407                 if (strcasecmp(t->u.equality.attr, "DnsDomain") == 0) {
 408                         domain = talloc_strndup(tmp_ctx,
 409                                                 (const char *)t->u.equality.value.data,
 410                                                 t->u.equality.value.length);
 411                 }
 412                 if (strcasecmp(t->u.equality.attr, "Host") == 0) {
 413                         host = talloc_strndup(tmp_ctx,
 414                                               (const char *)t->u.equality.value.data,
 415                                               t->u.equality.value.length);
 416                 }
 417                 if (strcasecmp(t->u.equality.attr, "DomainGuid") == 0) {
 418                         NTSTATUS enc_status;
 419                         struct GUID guid;
 420                         enc_status = ldap_decode_ndr_GUID(tmp_ctx,
 421                                                           t->u.equality.value, &guid);
 422                         if (NT_STATUS_IS_OK(enc_status)) {
 423                                 domain_guid = GUID_string(tmp_ctx, &guid);
 424                         }
 425                 }
 426                 if (strcasecmp(t->u.equality.attr, "DomainSid") == 0) {
 427                         enum ndr_err_code ndr_err;
 428
 429                         domain_sid = talloc(tmp_ctx, struct dom_sid);
 430                         if (domain_sid == NULL) {
 431                                 goto failed;
 432                         }
 433                         ndr_err = ndr_pull_struct_blob(&t->u.equality.value,
 434                                                        domain_sid, domain_sid,
 435                                                        (ndr_pull_flags_fn_t)ndr_pull_dom_sid);
 436                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 437                                 talloc_free(domain_sid);
 438                                 goto failed;
 439                         }
 440                 }
 441                 if (strcasecmp(t->u.equality.attr, "User") == 0) {
 442                         user = talloc_strndup(tmp_ctx,
 443                                               (const char *)t->u.equality.value.data,
 444                                               t->u.equality.value.length);
 445                 }
 446                 if (strcasecmp(t->u.equality.attr, "NtVer") == 0 &&
 447                     t->u.equality.value.length == 4) {
 448                         version = IVAL(t->u.equality.value.data, 0);
 449                 }
 450                 if (strcasecmp(t->u.equality.attr, "AAC") == 0 &&
 451                     t->u.equality.value.length == 4) {
 452                         acct_control = IVAL(t->u.equality.value.data, 0);
 453                 }
 454         }
 455
 456         if ((domain == NULL) && (domain_guid == NULL) && (domain_sid == NULL)) {
 457                 domain = lpcfg_dnsdomain(cldapd->task->lp_ctx);
 458         }
 459
 460         if (version == -1) {
 461                 goto failed;
 462         }
 463
 464         DEBUG(5,("cldap netlogon query domain=%s host=%s user=%s version=%d guid=%s\n",
 465                  domain, host, user, version, domain_guid));
 466
 467         status = fill_netlogon_samlogon_response(cldapd->samctx, tmp_ctx,
 468                                                  domain, NULL, domain_sid,
 469                                                  domain_guid,
 470                                                  user, acct_control,
 471                                                  tsocket_address_inet_addr_string(src, tmp_ctx),
 472                                                  version, cldapd->task->lp_ctx,
 473                                                  &netlogon, false);
 474         if (!NT_STATUS_IS_OK(status)) {
 475                 goto failed;
 476         }
 477
 478         status = cldap_netlogon_reply(cldap, message_id, src, version, &netlogon);
 479         if (!NT_STATUS_IS_OK(status)) {
 480                 goto failed;
 481         }
 482
 483         return;
 484
 485 failed:
 486         DEBUG(2,("cldap netlogon query failed domain=%s host=%s version=%d - %s\n",
 487                  domain, host, version, nt_errstr(status)));
 488         cldap_empty_reply(cldap, message_id, src);
 489 }