source4/dsdb/samdb/ldb_modules/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 "librpc/gen_ndr/ndr_misc.h"
  29 #include "libcli/ldap/ldap_ndr.h"
  30 #include "libcli/security/security.h"
  31 #include "dsdb/samdb/samdb.h"
  32 #include "dsdb/samdb/ldb_modules/util.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 #include "libds/common/flag_mapping.h"
  40 #include "lib/util/util_net.h"
  41
  42 /*
  43   fill in the cldap netlogon union for a given version
  44 */
  45 NTSTATUS fill_netlogon_samlogon_response(struct ldb_context *sam_ctx,
  46                                          TALLOC_CTX *mem_ctx,
  47                                          const char *domain,
  48                                          const char *netbios_domain,
  49                                          struct dom_sid *domain_sid,
  50                                          const char *domain_guid,
  51                                          const char *user,
  52                                          uint32_t acct_control,
  53                                          const char *src_address,
  54                                          uint32_t version,
  55                                          struct loadparm_context *lp_ctx,
  56                                          struct netlogon_samlogon_response *netlogon,
  57                                          bool fill_on_blank_request)
  58 {
  59         const char *dom_attrs[] = {"objectGUID", NULL};
  60         const char *none_attrs[] = {NULL};
  61         struct ldb_result *dom_res = NULL;
  62         int ret;
  63         const char **services = lpcfg_server_services(lp_ctx);
  64         uint32_t server_type;
  65         const char *pdc_name;
  66         struct GUID domain_uuid;
  67         const char *dns_domain;
  68         const char *forest_domain;
  69         const char *pdc_dns_name;
  70         const char *flatname;
  71         const char *server_site;
  72         const char *client_site;
  73         const char *pdc_ip;
  74         struct ldb_dn *domain_dn = NULL;
  75         struct interface *ifaces;
  76         bool user_known = false, am_rodc = false;
  77         uint32_t uac = 0;
  78         NTSTATUS status;
  79
  80         /* the domain parameter could have an optional trailing "." */
  81         if (domain && domain[strlen(domain)-1] == '.') {
  82                 domain = talloc_strndup(mem_ctx, domain, strlen(domain)-1);
  83                 NT_STATUS_HAVE_NO_MEMORY(domain);
  84         }
  85
  86         /* Lookup using long or short domainname */
  87         if (domain && (strcasecmp_m(domain, lpcfg_dnsdomain(lp_ctx)) == 0)) {
  88                 domain_dn = ldb_get_default_basedn(sam_ctx);
  89         }
  90         if (netbios_domain && (strcasecmp_m(netbios_domain, lpcfg_sam_name(lp_ctx)) == 0)) {
  91                 domain_dn = ldb_get_default_basedn(sam_ctx);
  92         }
  93         if (domain_dn) {
  94                 const char *domain_identifier = domain != NULL ? domain
  95                                                         : netbios_domain;
  96                 ret = ldb_search(sam_ctx, mem_ctx, &dom_res,
  97                                  domain_dn, LDB_SCOPE_BASE, dom_attrs,
  98                                  "objectClass=domain");
  99                 if (ret != LDB_SUCCESS) {
 100                         DEBUG(2,("Error finding domain '%s'/'%s' in sam: %s\n",
 101                                  domain_identifier,
 102                                  ldb_dn_get_linearized(domain_dn),
 103                                  ldb_errstring(sam_ctx)));
 104                         return NT_STATUS_NO_SUCH_DOMAIN;
 105                 }
 106                 if (dom_res->count != 1) {
 107                         DEBUG(2,("Error finding domain '%s'/'%s' in sam\n",
 108                                  domain_identifier,
 109                                  ldb_dn_get_linearized(domain_dn)));
 110                         return NT_STATUS_NO_SUCH_DOMAIN;
 111                 }
 112         }
 113
 114         /* Lookup using GUID or SID */
 115         if ((dom_res == NULL) && (domain_guid || domain_sid)) {
 116                 if (domain_guid) {
 117                         struct GUID binary_guid;
 118                         struct ldb_val guid_val;
 119
 120                         /* By this means, we ensure we don't have funny stuff in the GUID */
 121
 122                         status = GUID_from_string(domain_guid, &binary_guid);
 123                         if (!NT_STATUS_IS_OK(status)) {
 124                                 return status;
 125                         }
 126
 127                         /* And this gets the result into the binary format we want anyway */
 128                         status = GUID_to_ndr_blob(&binary_guid, mem_ctx, &guid_val);
 129                         if (!NT_STATUS_IS_OK(status)) {
 130                                 return status;
 131                         }
 132                         ret = ldb_search(sam_ctx, mem_ctx, &dom_res,
 133                                                  NULL, LDB_SCOPE_SUBTREE,
 134                                                  dom_attrs,
 135                                                  "(&(objectCategory=DomainDNS)(objectGUID=%s))",
 136                                                  ldb_binary_encode(mem_ctx, guid_val));
 137                 } else { /* domain_sid case */
 138                         ret = ldb_search(sam_ctx, mem_ctx, &dom_res,
 139                                          NULL, LDB_SCOPE_SUBTREE,
 140                                          dom_attrs,
 141                                          "(&(objectCategory=DomainDNS)(objectSid=%s))",
 142                                          dom_sid_string(mem_ctx, domain_sid));
 143                 }
 144
 145                 if (ret != LDB_SUCCESS) {
 146                         DEBUG(2,("Unable to find a correct reference to GUID '%s' or SID '%s' in sam: %s\n",
 147                                  domain_guid, dom_sid_string(mem_ctx, domain_sid),
 148                                  ldb_errstring(sam_ctx)));
 149                         return NT_STATUS_NO_SUCH_DOMAIN;
 150                 } else if (dom_res->count == 1) {
 151                         /* Ok, now just check it is our domain */
 152                         if (ldb_dn_compare(ldb_get_default_basedn(sam_ctx),
 153                                            dom_res->msgs[0]->dn) != 0) {
 154                                 DEBUG(2,("The GUID '%s' or SID '%s' doesn't identify our domain\n",
 155                                          domain_guid,
 156                                          dom_sid_string(mem_ctx, domain_sid)));
 157                                 return NT_STATUS_NO_SUCH_DOMAIN;
 158                         }
 159                 } else {
 160                         DEBUG(2,("Unable to find a correct reference to GUID '%s' or SID '%s' in sam\n",
 161                                  domain_guid, dom_sid_string(mem_ctx, domain_sid)));
 162                         return NT_STATUS_NO_SUCH_DOMAIN;
 163                 }
 164         }
 165
 166         if (dom_res == NULL && fill_on_blank_request) {
 167                 /* blank inputs gives our domain - tested against
 168                    w2k8r2. Without this ADUC on Win7 won't start */
 169                 domain_dn = ldb_get_default_basedn(sam_ctx);
 170                 ret = ldb_search(sam_ctx, mem_ctx, &dom_res,
 171                                  domain_dn, LDB_SCOPE_BASE, dom_attrs,
 172                                  "objectClass=domain");
 173                 if (ret != LDB_SUCCESS) {
 174                         DEBUG(2,("Error finding domain '%s'/'%s' in sam: %s\n",
 175                                  lpcfg_dnsdomain(lp_ctx),
 176                                  ldb_dn_get_linearized(domain_dn),
 177                                  ldb_errstring(sam_ctx)));
 178                         return NT_STATUS_NO_SUCH_DOMAIN;
 179                 }
 180         }
 181
 182         if (dom_res == NULL) {
 183                 DEBUG(2,(__location__ ": Unable to get domain information with no inputs\n"));
 184                 return NT_STATUS_NO_SUCH_DOMAIN;
 185         }
 186
 187         /* work around different inputs for not-specified users */
 188         if (!user) {
 189                 user = "";
 190         }
 191
 192         /* Enquire about any valid username with just a CLDAP packet -
 193          * if kerberos didn't also do this, the security folks would
 194          * scream... */
 195         if (user[0]) {
 196                 /* Only allow some bits to be enquired:  [MS-ATDS] 7.3.3.2 */
 197                 if (acct_control == (uint32_t)-1) {
 198                         acct_control = 0;
 199                 }
 200                 /*
 201                  * ACB_AUTOLOCK/UF_LOCKOUT seems to be a special
 202                  * hack for SEC_CHAN_DNS_DOMAIN.
 203                  *
 204                  * It's used together with user = "example.com."
 205                  */
 206                 if (acct_control != ACB_AUTOLOCK) {
 207                         acct_control &= (ACB_TEMPDUP | ACB_NORMAL | ACB_DOMTRUST | ACB_WSTRUST | ACB_SVRTRUST);
 208                 }
 209                 uac = ds_acb2uf(acct_control);
 210         }
 211
 212         if (uac == UF_LOCKOUT) {
 213                 struct ldb_message *tdo_msg = NULL;
 214
 215                 /*
 216                  * ACB_AUTOLOCK/UF_LOCKOUT seems to be a special
 217                  * hack for SEC_CHAN_DNS_DOMAIN.
 218                  *
 219                  * It's used together with user = "example.com."
 220                  */
 221                 status = dsdb_trust_search_tdo_by_type(sam_ctx,
 222                                                        SEC_CHAN_DNS_DOMAIN,
 223                                                        user, none_attrs,
 224                                                        mem_ctx, &tdo_msg);
 225                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 226                         user_known = false;
 227                 } else if (NT_STATUS_IS_OK(status)) {
 228                         TALLOC_FREE(tdo_msg);
 229                         user_known = true;
 230                 } else {
 231                         DEBUG(2,("Unable to find reference to TDO '%s' - %s\n",
 232                                  user, nt_errstr(status)));
 233                         return status;
 234                 }
 235         } else if (user[0]) {
 236                 struct ldb_result *user_res = NULL;
 237
 238                 /* We must exclude disabled accounts, but otherwise do the bitwise match the client asked for */
 239                 ret = ldb_search(sam_ctx, mem_ctx, &user_res,
 240                                          dom_res->msgs[0]->dn, LDB_SCOPE_SUBTREE,
 241                                          none_attrs,
 242                                          "(&(objectClass=user)(samAccountName=%s)"
 243                                          "(!(userAccountControl:" LDB_OID_COMPARATOR_AND ":=%u))"
 244                                          "(userAccountControl:" LDB_OID_COMPARATOR_OR ":=%u))",
 245                                          ldb_binary_encode_string(mem_ctx, user),
 246                                          UF_ACCOUNTDISABLE, uac);
 247                 if (ret != LDB_SUCCESS) {
 248                         DEBUG(2,("Unable to find reference to user '%s' with ACB 0x%8x under %s: %s\n",
 249                                  user, acct_control, ldb_dn_get_linearized(dom_res->msgs[0]->dn),
 250                                  ldb_errstring(sam_ctx)));
 251                         return NT_STATUS_NO_SUCH_USER;
 252                 } else if (user_res->count == 1) {
 253                         user_known = true;
 254                 } else {
 255                         user_known = false;
 256                 }
 257                 TALLOC_FREE(user_res);
 258         } else {
 259                 user_known = true;
 260         }
 261
 262         server_type = DS_SERVER_DS;
 263
 264         if (samdb_is_pdc(sam_ctx)) {
 265                 server_type |= DS_SERVER_PDC;
 266         }
 267
 268         if (samdb_is_gc(sam_ctx)) {
 269                 server_type |= DS_SERVER_GC;
 270         }
 271
 272         if (str_list_check(services, "ldap")) {
 273                 server_type |= DS_SERVER_LDAP;
 274         }
 275
 276         if (str_list_check(services, "kdc")) {
 277                 server_type |= DS_SERVER_KDC;
 278         }
 279
 280         if (str_list_check(services, "ntp_signd")) {
 281                 server_type |= DS_SERVER_TIMESERV | DS_SERVER_GOOD_TIMESERV;
 282         }
 283
 284         if (samdb_rodc(sam_ctx, &am_rodc) == LDB_SUCCESS && !am_rodc) {
 285                 server_type |= DS_SERVER_WRITABLE;
 286         }
 287
 288         if (dsdb_functional_level(sam_ctx) >= DS_DOMAIN_FUNCTION_2008) {
 289                 if (server_type & DS_SERVER_WRITABLE) {
 290                         server_type |= DS_SERVER_FULL_SECRET_DOMAIN_6;
 291                 } else {
 292                         server_type |= DS_SERVER_SELECT_SECRET_DOMAIN_6;
 293                 }
 294         }
 295
 296         if (version & (NETLOGON_NT_VERSION_5EX|NETLOGON_NT_VERSION_5EX_WITH_IP)) {
 297                 pdc_name = lpcfg_netbios_name(lp_ctx);
 298         } else {
 299                 pdc_name = talloc_asprintf(mem_ctx, "\\\\%s",
 300                                            lpcfg_netbios_name(lp_ctx));
 301                 NT_STATUS_HAVE_NO_MEMORY(pdc_name);
 302         }
 303         domain_uuid      = samdb_result_guid(dom_res->msgs[0], "objectGUID");
 304         dns_domain       = lpcfg_dnsdomain(lp_ctx);
 305         forest_domain    = samdb_forest_name(sam_ctx, mem_ctx);
 306         NT_STATUS_HAVE_NO_MEMORY(forest_domain);
 307         pdc_dns_name     = talloc_asprintf(mem_ctx, "%s.%s",
 308                                            strlower_talloc(mem_ctx,
 309                                                            lpcfg_netbios_name(lp_ctx)),
 310                                            dns_domain);
 311         NT_STATUS_HAVE_NO_MEMORY(pdc_dns_name);
 312         flatname         = lpcfg_workgroup(lp_ctx);
 313
 314         server_site      = samdb_server_site_name(sam_ctx, mem_ctx);
 315         NT_STATUS_HAVE_NO_MEMORY(server_site);
 316         client_site      = samdb_client_site_name(sam_ctx, mem_ctx,
 317                                                   src_address, NULL);
 318         NT_STATUS_HAVE_NO_MEMORY(client_site);
 319         if (strcasecmp(server_site, client_site) == 0) {
 320                 server_type |= DS_SERVER_CLOSEST;
 321         }
 322
 323         load_interface_list(mem_ctx, lp_ctx, &ifaces);
 324         if (src_address) {
 325                 pdc_ip = iface_list_best_ip(ifaces, src_address);
 326         } else {
 327                 pdc_ip = iface_list_first_v4(ifaces);
 328         }
 329         if (pdc_ip == NULL || !is_ipaddress_v4(pdc_ip)) {
 330                 /* this matches windows behaviour */
 331                 pdc_ip = "127.0.0.1";
 332         }
 333
 334         ZERO_STRUCTP(netlogon);
 335
 336         /* check if either of these bits is present */
 337         if (version & (NETLOGON_NT_VERSION_5EX|NETLOGON_NT_VERSION_5EX_WITH_IP)) {
 338                 uint32_t extra_flags = 0;
 339                 netlogon->ntver = NETLOGON_NT_VERSION_5EX;
 340
 341                 /* could check if the user exists */
 342                 if (user_known) {
 343                         netlogon->data.nt5_ex.command      = LOGON_SAM_LOGON_RESPONSE_EX;
 344                 } else {
 345                         netlogon->data.nt5_ex.command      = LOGON_SAM_LOGON_USER_UNKNOWN_EX;
 346                 }
 347                 netlogon->data.nt5_ex.pdc_name     = pdc_name;
 348                 netlogon->data.nt5_ex.user_name    = user;
 349                 netlogon->data.nt5_ex.domain_name  = flatname;
 350                 netlogon->data.nt5_ex.domain_uuid  = domain_uuid;
 351                 netlogon->data.nt5_ex.forest       = forest_domain;
 352                 netlogon->data.nt5_ex.dns_domain   = dns_domain;
 353                 netlogon->data.nt5_ex.pdc_dns_name = pdc_dns_name;
 354                 netlogon->data.nt5_ex.server_site  = server_site;
 355                 netlogon->data.nt5_ex.client_site  = client_site;
 356                 if (version & NETLOGON_NT_VERSION_5EX_WITH_IP) {
 357                         /* note that this is always a IPV4 address */
 358                         extra_flags = NETLOGON_NT_VERSION_5EX_WITH_IP;
 359                         netlogon->data.nt5_ex.sockaddr.sockaddr_family    = 2;
 360                         netlogon->data.nt5_ex.sockaddr.pdc_ip       = pdc_ip;
 361                         netlogon->data.nt5_ex.sockaddr.remaining = data_blob_talloc_zero(mem_ctx, 8);
 362                 }
 363                 netlogon->data.nt5_ex.server_type  = server_type;
 364                 netlogon->data.nt5_ex.nt_version   = NETLOGON_NT_VERSION_1|NETLOGON_NT_VERSION_5EX|extra_flags;
 365                 netlogon->data.nt5_ex.lmnt_token   = 0xFFFF;
 366                 netlogon->data.nt5_ex.lm20_token   = 0xFFFF;
 367
 368         } else if (version & NETLOGON_NT_VERSION_5) {
 369                 netlogon->ntver = NETLOGON_NT_VERSION_5;
 370
 371                 /* could check if the user exists */
 372                 if (user_known) {
 373                         netlogon->data.nt5.command      = LOGON_SAM_LOGON_RESPONSE;
 374                 } else {
 375                         netlogon->data.nt5.command      = LOGON_SAM_LOGON_USER_UNKNOWN;
 376                 }
 377                 netlogon->data.nt5.pdc_name     = pdc_name;
 378                 netlogon->data.nt5.user_name    = user;
 379                 netlogon->data.nt5.domain_name  = flatname;
 380                 netlogon->data.nt5.domain_uuid  = domain_uuid;
 381                 netlogon->data.nt5.forest       = forest_domain;
 382                 netlogon->data.nt5.dns_domain   = dns_domain;
 383                 netlogon->data.nt5.pdc_dns_name = pdc_dns_name;
 384                 netlogon->data.nt5.pdc_ip       = pdc_ip;
 385                 netlogon->data.nt5.server_type  = server_type;
 386                 netlogon->data.nt5.nt_version   = NETLOGON_NT_VERSION_1|NETLOGON_NT_VERSION_5;
 387                 netlogon->data.nt5.lmnt_token   = 0xFFFF;
 388                 netlogon->data.nt5.lm20_token   = 0xFFFF;
 389
 390         } else /* (version & NETLOGON_NT_VERSION_1) and all other cases */ {
 391                 netlogon->ntver = NETLOGON_NT_VERSION_1;
 392                 /* could check if the user exists */
 393                 if (user_known) {
 394                         netlogon->data.nt4.command      = LOGON_SAM_LOGON_RESPONSE;
 395                 } else {
 396                         netlogon->data.nt4.command      = LOGON_SAM_LOGON_USER_UNKNOWN;
 397                 }
 398                 netlogon->data.nt4.pdc_name    = pdc_name;
 399                 netlogon->data.nt4.user_name   = user;
 400                 netlogon->data.nt4.domain_name = flatname;
 401                 netlogon->data.nt4.nt_version  = NETLOGON_NT_VERSION_1;
 402                 netlogon->data.nt4.lmnt_token  = 0xFFFF;
 403                 netlogon->data.nt4.lm20_token  = 0xFFFF;
 404         }
 405
 406         return NT_STATUS_OK;
 407 }
 408
 409 NTSTATUS parse_netlogon_request(struct ldb_parse_tree *tree,
 410                                 struct loadparm_context *lp_ctx,
 411                                 TALLOC_CTX *tmp_ctx,
 412                                 const char **domain,
 413                                 const char **host,
 414                                 const char **user,
 415                                 const char **domain_guid,
 416                                 struct dom_sid **domain_sid,
 417                                 int *acct_control,
 418                                 int *version)
 419 {
 420         unsigned int i;
 421
 422         *domain = NULL;
 423         *host = NULL;
 424         *user = NULL;
 425         *domain_guid = NULL;
 426         *domain_sid = NULL;
 427         *acct_control = -1;
 428         *version = NETLOGON_NT_VERSION_5;
 429
 430         if (tree->operation != LDB_OP_AND) goto failed;
 431
 432         /* extract the query elements */
 433         for (i=0;i<tree->u.list.num_elements;i++) {
 434                 struct ldb_parse_tree *t = tree->u.list.elements[i];
 435                 if (t->operation != LDB_OP_EQUALITY) goto failed;
 436                 if (strcasecmp(t->u.equality.attr, "DnsDomain") == 0) {
 437                         *domain = talloc_strndup(tmp_ctx,
 438                                                 (const char *)t->u.equality.value.data,
 439                                                 t->u.equality.value.length);
 440                 }
 441                 if (strcasecmp(t->u.equality.attr, "Host") == 0) {
 442                         *host = 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, "DomainGuid") == 0) {
 447                         NTSTATUS enc_status;
 448                         struct GUID guid;
 449                         enc_status = ldap_decode_ndr_GUID(tmp_ctx,
 450                                                           t->u.equality.value, &guid);
 451                         if (NT_STATUS_IS_OK(enc_status)) {
 452                                 *domain_guid = GUID_string(tmp_ctx, &guid);
 453                         }
 454                 }
 455                 if (strcasecmp(t->u.equality.attr, "DomainSid") == 0) {
 456                         enum ndr_err_code ndr_err;
 457
 458                         *domain_sid = talloc(tmp_ctx, struct dom_sid);
 459                         if (*domain_sid == NULL) {
 460                                 goto failed;
 461                         }
 462                         ndr_err = ndr_pull_struct_blob(&t->u.equality.value,
 463                                                        *domain_sid, *domain_sid,
 464                                                        (ndr_pull_flags_fn_t)ndr_pull_dom_sid);
 465                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 466                                 talloc_free(*domain_sid);
 467                                 goto failed;
 468                         }
 469                 }
 470                 if (strcasecmp(t->u.equality.attr, "User") == 0) {
 471                         *user = talloc_strndup(tmp_ctx,
 472                                                (const char *)t->u.equality.value.data,
 473                                                t->u.equality.value.length);
 474                 }
 475                 if (strcasecmp(t->u.equality.attr, "NtVer") == 0 &&
 476                     t->u.equality.value.length == 4) {
 477                         *version = IVAL(t->u.equality.value.data, 0);
 478                 }
 479                 if (strcasecmp(t->u.equality.attr, "AAC") == 0 &&
 480                     t->u.equality.value.length == 4) {
 481                         *acct_control = IVAL(t->u.equality.value.data, 0);
 482                 }
 483         }
 484
 485         if ((*domain == NULL) && (*domain_guid == NULL) && (*domain_sid == NULL)) {
 486                 *domain = lpcfg_dnsdomain(lp_ctx);
 487         }
 488
 489         return NT_STATUS_OK;
 490
 491 failed:
 492         return NT_STATUS_UNSUCCESSFUL;
 493 }