source4/rpc_server/dnsserver/dnsutils.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    DNS Server
   5
   6    Copyright (C) Amitay Isaacs 2011
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "dnsserver.h"
  24 #include "rpc_server/common/common.h"
  25 #include "dsdb/samdb/samdb.h"
  26 #include "lib/socket/netif.h"
  27 #include "lib/util/util_net.h"
  28
  29 static struct DNS_ADDR_ARRAY *fill_dns_addr_array(TALLOC_CTX *mem_ctx,
  30                                            struct loadparm_context *lp_ctx,
  31                                            bool listen_only)
  32 {
  33         struct interface *ifaces;
  34         int num_interfaces, i;
  35         struct DNS_ADDR_ARRAY *dns_addr_array;
  36         const char *ipstr;
  37         bool have_ipv4, have_ipv6;
  38         uint16_t family;
  39
  40         have_ipv4 = have_ipv6 = false;
  41
  42         if (!listen_only) {
  43                 /*
  44                   Return all interfaces from kernel
  45                   Not implemented!
  46                 */
  47                 return NULL;
  48         }
  49
  50         /* Only the used interfaces */
  51         load_interface_list(mem_ctx, lp_ctx, &ifaces);
  52         num_interfaces = iface_list_count(ifaces);
  53
  54         dns_addr_array = talloc_zero(mem_ctx, struct DNS_ADDR_ARRAY);
  55         if (dns_addr_array == NULL) {
  56                 goto nomem;
  57         }
  58         dns_addr_array->MaxCount = num_interfaces;
  59         dns_addr_array->AddrCount = num_interfaces;
  60         if (num_interfaces == 0) {
  61                 goto nomem;
  62         }
  63
  64         dns_addr_array->AddrArray = talloc_zero_array(mem_ctx, struct DNS_ADDR,
  65                                                       num_interfaces);
  66         if (!dns_addr_array->AddrArray) {
  67                 TALLOC_FREE(dns_addr_array);
  68                 goto nomem;
  69         }
  70
  71         for (i = 0; i < num_interfaces; i++) {
  72                 ipstr = iface_list_n_ip(ifaces, i);
  73                 if (is_ipaddress_v4(ipstr)) {
  74                         have_ipv4 = true;
  75                         dns_addr_array->AddrArray[i].MaxSa[0] = 0x02;
  76                         inet_pton(AF_INET, ipstr,
  77                                   &dns_addr_array->AddrArray[i].MaxSa[4]);
  78                 } else {
  79                         have_ipv6 = true;
  80                         dns_addr_array->AddrArray[i].MaxSa[0] = 0x17;
  81                         inet_pton(AF_INET6, ipstr,
  82                                   &dns_addr_array->AddrArray[i].MaxSa[8]);
  83                 }
  84         }
  85
  86         if (have_ipv4 && have_ipv6) {
  87                 family = 0;   /* mixed: MS-DNSP */
  88         } else if (have_ipv4 && !have_ipv6) {
  89                 family = AF_INET;
  90         } else {
  91                 family = AF_INET6;
  92         }
  93         dns_addr_array->Family = family;
  94
  95 nomem:
  96         talloc_free(ifaces);
  97         return dns_addr_array;
  98 }
  99
 100 struct dnsserver_serverinfo *dnsserver_init_serverinfo(TALLOC_CTX *mem_ctx,
 101                                                         struct loadparm_context *lp_ctx,
 102                                                         struct ldb_context *samdb)
 103 {
 104         struct dnsserver_serverinfo *serverinfo;
 105         struct dcerpc_server_info *dinfo;
 106         struct ldb_dn *domain_dn, *forest_dn;
 107
 108         serverinfo = talloc_zero(mem_ctx, struct dnsserver_serverinfo);
 109         if (serverinfo == NULL) {
 110                 return NULL;
 111         }
 112
 113         dinfo = lpcfg_dcerpc_server_info(mem_ctx, lp_ctx);
 114         if (dinfo) {
 115                 serverinfo->dwVersion = (dinfo->version_build & 0x0000FFFF) << 16 |
 116                                 (dinfo->version_minor & 0x000000FF) << 8 |
 117                                 (dinfo->version_major & 0x000000FF);
 118                 talloc_free(dinfo);
 119         } else {
 120                 serverinfo->dwVersion = 0x0ECE0205; /* build, os_minor, os_major */;
 121         }
 122
 123         serverinfo->fBootMethod = DNS_BOOT_METHOD_DIRECTORY;
 124         serverinfo->fAdminConfigured = 0;
 125         serverinfo->fAllowUpdate = 1;
 126         serverinfo->fDsAvailable = 1;
 127
 128         serverinfo->pszServerName = talloc_asprintf(mem_ctx, "%s.%s",
 129                                         lpcfg_netbios_name(lp_ctx),
 130                                         lpcfg_dnsdomain(lp_ctx));
 131
 132         domain_dn = ldb_get_default_basedn(samdb);
 133         forest_dn = ldb_get_root_basedn(samdb);
 134
 135         serverinfo->pszDsContainer = talloc_asprintf(mem_ctx,
 136                                         "CN=MicrosoftDNS,DC=DomainDnsZones,%s",
 137                                         ldb_dn_get_linearized(domain_dn));
 138
 139         serverinfo->dwDsForestVersion = dsdb_forest_functional_level(samdb);
 140         serverinfo->dwDsDomainVersion = dsdb_functional_level(samdb);
 141         serverinfo->dwDsDsaVersion = 4; /* need to do ldb search here */
 142
 143         serverinfo->pszDomainName = samdb_dn_to_dns_domain(mem_ctx, domain_dn);
 144         serverinfo->pszForestName = samdb_dn_to_dns_domain(mem_ctx, forest_dn);
 145
 146         serverinfo->pszDomainDirectoryPartition = talloc_asprintf(mem_ctx,
 147                                                         "DC=DomainDnsZones,%s",
 148                                                         ldb_dn_get_linearized(domain_dn));
 149         serverinfo->pszForestDirectoryPartition = talloc_asprintf(mem_ctx,
 150                                                         "DC=ForestDnsZones,%s",
 151                                                         ldb_dn_get_linearized(forest_dn));
 152         /* IP addresses on which the DNS server listens for DNS requests */
 153         serverinfo->aipListenAddrs = fill_dns_addr_array(mem_ctx, lp_ctx, true);
 154
 155         /* All IP addresses available on the server
 156          * Not implemented!
 157          * Use same as listen addresses
 158          */
 159         serverinfo->aipServerAddrs = serverinfo->aipListenAddrs;
 160
 161         serverinfo->aipForwarders = NULL;
 162
 163         serverinfo->aipLogFilter = NULL;
 164         serverinfo->pwszLogFilePath = NULL;
 165
 166         serverinfo->dwLogLevel = 0;
 167         serverinfo->dwDebugLevel = 0;
 168         serverinfo->dwEventLogLevel = DNS_EVENT_LOG_INFORMATION_TYPE;
 169         serverinfo->dwLogFileMaxSize = 0;
 170
 171         serverinfo->dwForwardTimeout = 3; /* seconds (default) */
 172         serverinfo->dwRpcProtocol = 5;
 173         serverinfo->dwNameCheckFlag = DNS_ALLOW_MULTIBYTE_NAMES;
 174         serverinfo->cAddressAnswerLimit = 0;
 175         serverinfo->dwRecursionRetry = 3 /* seconds (default) */;
 176         serverinfo->dwRecursionTimeout = 8 /* seconds (default) */;
 177         serverinfo->dwMaxCacheTtl = 0x00015180; /* 1 day (default) */;
 178         serverinfo->dwDsPollingInterval = 0xB4; /* 3 minutes (default) */;
 179         serverinfo->dwLocalNetPriorityNetMask = 0x000000FF;;
 180
 181         serverinfo->dwScavengingInterval = 0;
 182         serverinfo->dwDefaultRefreshInterval = 0xA8; /* 7 days in hours */;
 183         serverinfo->dwDefaultNoRefreshInterval = 0xA8; /* 7 days in hours */;;
 184         serverinfo->dwLastScavengeTime = 0;
 185
 186         serverinfo->fAutoReverseZones = 0;
 187         serverinfo->fAutoCacheUpdate = 0;
 188
 189         serverinfo->fRecurseAfterForwarding = 0;
 190         serverinfo->fForwardDelegations = 1;
 191         serverinfo->fNoRecursion = 0;
 192         serverinfo->fSecureResponses = 0;
 193
 194         serverinfo->fRoundRobin = 1;
 195         serverinfo->fLocalNetPriority = 0;
 196
 197         serverinfo->fBindSecondaries = 0;
 198         serverinfo->fWriteAuthorityNs = 0;
 199
 200         serverinfo->fStrictFileParsing = 0;
 201         serverinfo->fLooseWildcarding = 0 ;
 202         serverinfo->fDefaultAgingState = 0;
 203
 204         return serverinfo;
 205 }
 206
 207
 208 struct dnsserver_zoneinfo *dnsserver_init_zoneinfo(struct dnsserver_zone *zone,
 209                                                 struct dnsserver_serverinfo *serverinfo)
 210 {
 211         struct dnsserver_zoneinfo *zoneinfo;
 212         uint32_t fReverse;
 213         const char *revzone = "in-addr.arpa";
 214         const char *revzone6 = "ip6.arpa";
 215         int len1, len2;
 216
 217         zoneinfo = talloc_zero(zone, struct dnsserver_zoneinfo);
 218         if (zoneinfo == NULL) {
 219                 return NULL;
 220         }
 221
 222         /* If the zone name ends with in-addr.arpa, it's reverse zone */
 223         /* If the zone name ends with ip6.arpa, it's reverse zone (IPv6) */
 224         fReverse = 0;
 225         len1 = strlen(zone->name);
 226         len2 = strlen(revzone);
 227         if (len1 > len2 && strcasecmp(&zone->name[len1-len2], revzone) == 0) {
 228                 fReverse = 1;
 229         } else {
 230                 len2 = strlen(revzone6);
 231                 if (len1 > len2 && strcasecmp(&zone->name[len1-len2], revzone6) == 0) {
 232                         fReverse = 1;
 233                 }
 234         }
 235
 236         zoneinfo->Version = 0x32;
 237         zoneinfo->Flags = DNS_RPC_ZONE_DSINTEGRATED;
 238
 239         if (strcmp(zone->name, ".") == 0) {
 240                 zoneinfo->dwZoneType = DNS_ZONE_TYPE_CACHE;
 241                 zoneinfo->fAllowUpdate = DNS_ZONE_UPDATE_OFF;
 242                 zoneinfo->fSecureSecondaries = DNS_ZONE_SECSECURE_NO_SECURITY;
 243                 zoneinfo->fNotifyLevel = DNS_ZONE_NOTIFY_OFF;
 244                 zoneinfo->dwNoRefreshInterval = 0;
 245                 zoneinfo->dwRefreshInterval = 0;
 246         } else {
 247                 zoneinfo->Flags |= DNS_RPC_ZONE_UPDATE_SECURE;
 248                 zoneinfo->dwZoneType = DNS_ZONE_TYPE_PRIMARY;
 249                 zoneinfo->fAllowUpdate = DNS_ZONE_UPDATE_SECURE;
 250                 zoneinfo->fSecureSecondaries = DNS_ZONE_SECSECURE_NO_XFER;
 251                 zoneinfo->fNotifyLevel = DNS_ZONE_NOTIFY_LIST_ONLY;
 252                 zoneinfo->dwNoRefreshInterval = serverinfo->dwDefaultNoRefreshInterval;
 253                 zoneinfo->dwRefreshInterval = serverinfo->dwDefaultRefreshInterval;
 254         }
 255
 256         zoneinfo->fReverse = fReverse;
 257         zoneinfo->fPaused = 0;
 258         zoneinfo->fShutdown = 0;
 259         zoneinfo->fAutoCreated = 0;
 260         zoneinfo->fUseDatabase = 1;
 261         zoneinfo->pszDataFile = NULL;
 262         zoneinfo->aipMasters = NULL;
 263         zoneinfo->aipSecondaries = NULL;
 264         zoneinfo->aipNotify = NULL;
 265         zoneinfo->fUseWins = 0;
 266         zoneinfo->fUseNbstat = 0;
 267         zoneinfo->fAging = 0;
 268         zoneinfo->dwAvailForScavengeTime = 0;
 269         zoneinfo->aipScavengeServers = NULL;
 270         zoneinfo->dwForwarderTimeout = 0;
 271         zoneinfo->fForwarderSlave = 0;
 272         zoneinfo->aipLocalMasters = NULL;
 273         zoneinfo->pwszZoneDn = discard_const_p(char, ldb_dn_get_linearized(zone->zone_dn));
 274         zoneinfo->dwLastSuccessfulSoaCheck = 0;
 275         zoneinfo->dwLastSuccessfulXfr = 0;
 276         zoneinfo->fQueuedForBackgroundLoad = 0;
 277         zoneinfo->fBackgroundLoadInProgress = 0;
 278         zoneinfo->fReadOnlyZone = 0;
 279         zoneinfo->dwLastXfrAttempt = 0;
 280         zoneinfo->dwLastXfrResult = 0;
 281
 282         return zoneinfo;
 283 }
 284
 285 struct dnsserver_partition *dnsserver_find_partition(struct dnsserver_partition *partitions,
 286                                                      const char *dp_fqdn)
 287 {
 288         struct dnsserver_partition *p = NULL;
 289
 290         for (p = partitions; p; p = p->next) {
 291                 if (strcasecmp(dp_fqdn, p->pszDpFqdn) == 0) {
 292                         break;
 293                 }
 294         }
 295
 296         return p;
 297 }
 298
 299 struct dnsserver_zone *dnsserver_find_zone(struct dnsserver_zone *zones, const char *zone_name)
 300 {
 301         struct dnsserver_zone *z = NULL;
 302
 303         for (z = zones; z; z = z->next) {
 304                 if (strcasecmp(zone_name, z->name) == 0) {
 305                         break;
 306                 }
 307         }
 308
 309         return z;
 310 }
 311
 312 struct ldb_dn *dnsserver_name_to_dn(TALLOC_CTX *mem_ctx, struct dnsserver_zone *z, const char *name)
 313 {
 314         struct ldb_dn *dn;
 315         bool ret;
 316
 317         dn = ldb_dn_copy(mem_ctx, z->zone_dn);
 318         if (dn == NULL) {
 319                 return NULL;
 320         }
 321         if (strcasecmp(name, z->name) == 0) {
 322                 ret = ldb_dn_add_child_fmt(dn, "DC=@");
 323         } else {
 324                 ret = ldb_dn_add_child_fmt(dn, "DC=%s", name);
 325         }
 326         if (!ret) {
 327                 talloc_free(dn);
 328                 return NULL;
 329         }
 330
 331         return dn;
 332 }
 333
 334 uint32_t dnsserver_zone_to_request_filter(const char *zone_name)
 335 {
 336         uint32_t request_filter = 0;
 337
 338         if (strcmp(zone_name, "..AllZones") == 0) {
 339                 request_filter = DNS_ZONE_REQUEST_PRIMARY
 340                         | DNS_ZONE_REQUEST_SECONDARY
 341                         | DNS_ZONE_REQUEST_AUTO
 342                         | DNS_ZONE_REQUEST_FORWARD
 343                         | DNS_ZONE_REQUEST_REVERSE
 344                         | DNS_ZONE_REQUEST_FORWARDER
 345                         | DNS_ZONE_REQUEST_STUB
 346                         | DNS_ZONE_REQUEST_DS
 347                         | DNS_ZONE_REQUEST_NON_DS
 348                         | DNS_ZONE_REQUEST_DOMAIN_DP
 349                         | DNS_ZONE_REQUEST_FOREST_DP
 350                         | DNS_ZONE_REQUEST_CUSTOM_DP
 351                         | DNS_ZONE_REQUEST_LEGACY_DP;
 352         } else if (strcmp(zone_name, "..AllZonesAndCache") == 0) {
 353                 request_filter = DNS_ZONE_REQUEST_PRIMARY
 354                         | DNS_ZONE_REQUEST_SECONDARY
 355                         | DNS_ZONE_REQUEST_CACHE
 356                         | DNS_ZONE_REQUEST_AUTO
 357                         | DNS_ZONE_REQUEST_FORWARD
 358                         | DNS_ZONE_REQUEST_REVERSE
 359                         | DNS_ZONE_REQUEST_FORWARDER
 360                         | DNS_ZONE_REQUEST_STUB
 361                         | DNS_ZONE_REQUEST_DS
 362                         | DNS_ZONE_REQUEST_NON_DS
 363                         | DNS_ZONE_REQUEST_DOMAIN_DP
 364                         | DNS_ZONE_REQUEST_FOREST_DP
 365                         | DNS_ZONE_REQUEST_CUSTOM_DP
 366                         | DNS_ZONE_REQUEST_LEGACY_DP;
 367         } else if (strcmp(zone_name, "..AllPrimaryZones") == 0) {
 368                 request_filter = DNS_ZONE_REQUEST_PRIMARY;
 369         } else if (strcmp(zone_name, "..AllSecondaryZones") == 0) {
 370                 request_filter = DNS_ZONE_REQUEST_SECONDARY;
 371         } else if (strcmp(zone_name, "..AllForwardZones") == 0) {
 372                 request_filter = DNS_ZONE_REQUEST_FORWARD;
 373         } else if (strcmp(zone_name, "..AllReverseZones") == 0) {
 374                 request_filter = DNS_ZONE_REQUEST_REVERSE;
 375         } else if (strcmp(zone_name, "..AllDsZones") == 0) {
 376                 request_filter = DNS_ZONE_REQUEST_DS;
 377         } else if (strcmp(zone_name, "..AllNonDsZones") == 0) {
 378                 request_filter = DNS_ZONE_REQUEST_NON_DS;
 379         } else if (strcmp(zone_name, "..AllPrimaryReverseZones") == 0) {
 380                 request_filter = DNS_ZONE_REQUEST_PRIMARY
 381                         | DNS_ZONE_REQUEST_REVERSE;
 382         } else if (strcmp(zone_name, "..AllPrimaryForwardZones") == 0) {
 383                 request_filter = DNS_ZONE_REQUEST_PRIMARY
 384                         | DNS_ZONE_REQUEST_FORWARD;
 385         } else if (strcmp(zone_name, "..AllSecondaryReverseZones") == 0) {
 386                 request_filter = DNS_ZONE_REQUEST_SECONDARY
 387                         | DNS_ZONE_REQUEST_REVERSE;
 388         } else if (strcmp(zone_name, "..AllSecondaryForwardZones") == 0) {
 389                 request_filter = DNS_ZONE_REQUEST_SECONDARY
 390                         | DNS_ZONE_REQUEST_REVERSE;
 391         }
 392
 393         return request_filter;
 394 }