source/nbt_server/dgram/netlogon.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    NBT datagram netlogon server
   5
   6    Copyright (C) Andrew Tridgell        2005
   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 "nbt_server/nbt_server.h"
  24 #include "lib/socket/socket.h"
  25 #include "lib/ldb/include/ldb.h"
  26 #include "dsdb/samdb/samdb.h"
  27 #include "auth/auth.h"
  28 #include "db_wrap.h"
  29 #include "librpc/gen_ndr/ndr_nbt.h"
  30
  31 /*
  32   reply to a GETDC request
  33  */
  34 static void nbtd_netlogon_getdc(struct dgram_mailslot_handler *dgmslot,
  35                                 struct nbtd_interface *iface,
  36                                 struct nbt_dgram_packet *packet,
  37                                 const struct socket_address *src,
  38                                 struct nbt_netlogon_packet *netlogon)
  39 {
  40         struct nbt_name *name = &packet->data.msg.dest_name;
  41         struct nbtd_interface *reply_iface = nbtd_find_reply_iface(iface, src->addr, False);
  42         struct nbt_netlogon_packet reply;
  43         struct nbt_netlogon_response_from_pdc *pdc;
  44         const char *ref_attrs[] = {"nETBIOSName", NULL};
  45         struct ldb_message **ref_res;
  46         struct ldb_context *samctx;
  47         struct ldb_dn *partitions_basedn;
  48         int ret;
  49
  50         /* only answer getdc requests on the PDC or LOGON names */
  51         if (name->type != NBT_NAME_PDC && name->type != NBT_NAME_LOGON) {
  52                 return;
  53         }
  54
  55         samctx = samdb_connect(packet, anonymous_session(packet));
  56         if (samctx == NULL) {
  57                 DEBUG(2,("Unable to open sam in getdc reply\n"));
  58                 return;
  59         }
  60
  61         partitions_basedn = samdb_partitions_dn(samctx, samctx);
  62
  63         ret = gendb_search(samctx, samctx, partitions_basedn, &ref_res, ref_attrs,
  64                            "(&(&(nETBIOSName=%s)(objectclass=crossRef))(ncName=*))",
  65                            name->name);
  66
  67         if (ret != 1) {
  68                 DEBUG(2,("Unable to find domain reference '%s' in sam\n", name->name));
  69                 return;
  70         }
  71
  72         /* setup a GETDC reply */
  73         ZERO_STRUCT(reply);
  74         reply.command = NETLOGON_RESPONSE_FROM_PDC;
  75         pdc = &reply.req.response;
  76
  77         pdc->pdc_name         = lp_netbios_name();
  78         pdc->unicode_pdc_name = pdc->pdc_name;
  79         pdc->domain_name      = samdb_result_string(ref_res[0], "nETBIOSName", name->name);;
  80         pdc->nt_version       = 1;
  81         pdc->lmnt_token       = 0xFFFF;
  82         pdc->lm20_token       = 0xFFFF;
  83
  84
  85         packet->data.msg.dest_name.type = 0;
  86
  87         dgram_mailslot_netlogon_reply(reply_iface->dgmsock,
  88                                       packet,
  89                                       netlogon->req.pdc.mailslot_name,
  90                                       &reply);
  91 }
  92
  93
  94 /*
  95   reply to a ADS style GETDC request
  96  */
  97 static void nbtd_netlogon_getdc2(struct dgram_mailslot_handler *dgmslot,
  98                                  struct nbtd_interface *iface,
  99                                  struct nbt_dgram_packet *packet,
 100                                  const struct socket_address *src,
 101                                  struct nbt_netlogon_packet *netlogon)
 102 {
 103         struct nbt_name *name = &packet->data.msg.dest_name;
 104         struct nbtd_interface *reply_iface = nbtd_find_reply_iface(iface, src->addr, False);
 105         struct nbt_netlogon_packet reply;
 106         struct nbt_netlogon_response_from_pdc2 *pdc;
 107         struct ldb_context *samctx;
 108         const char *ref_attrs[] = {"nETBIOSName", "dnsRoot", "ncName", NULL};
 109         const char *dom_attrs[] = {"objectGUID", NULL};
 110         struct ldb_message **ref_res, **dom_res;
 111         int ret;
 112         const char **services = lp_server_services();
 113         const char *my_ip = reply_iface->ip_address;
 114         struct ldb_dn *partitions_basedn;
 115         if (!my_ip) {
 116                 DEBUG(0, ("Could not obtain own IP address for datagram socket\n"));
 117                 return;
 118         }
 119
 120         /* only answer getdc requests on the PDC or LOGON names */
 121         if (name->type != NBT_NAME_PDC && name->type != NBT_NAME_LOGON) {
 122                 return;
 123         }
 124
 125         samctx = samdb_connect(packet, anonymous_session(packet));
 126         if (samctx == NULL) {
 127                 DEBUG(2,("Unable to open sam in getdc reply\n"));
 128                 return;
 129         }
 130
 131         partitions_basedn = samdb_partitions_dn(samctx, samctx);
 132
 133         ret = gendb_search(samctx, samctx, partitions_basedn, &ref_res, ref_attrs,
 134                                   "(&(&(nETBIOSName=%s)(objectclass=crossRef))(ncName=*))",
 135                                   name->name);
 136
 137         if (ret != 1) {
 138                 DEBUG(2,("Unable to find domain reference '%s' in sam\n", name->name));
 139                 return;
 140         }
 141
 142         /* try and find the domain */
 143         ret = gendb_search_dn(samctx, samctx,
 144                               samdb_result_dn(samctx, samctx, ref_res[0], "ncName", NULL),
 145                               &dom_res, dom_attrs);
 146         if (ret != 1) {
 147                 DEBUG(2,("Unable to find domain from reference '%s' in sam\n",
 148                          ldb_dn_get_linearized(ref_res[0]->dn)));
 149                 return;
 150         }
 151
 152         /* setup a GETDC reply */
 153         ZERO_STRUCT(reply);
 154         reply.command = NETLOGON_RESPONSE_FROM_PDC2;
 155
 156 #if 0
 157         /* newer testing shows that the reply command type is not
 158            changed based on whether a username is given in the
 159            reply. This was what was causing the w2k join to be so
 160            slow */
 161         if (netlogon->req.pdc2.user_name[0]) {
 162                 reply.command = NETLOGON_RESPONSE_FROM_PDC_USER;
 163         }
 164 #endif
 165
 166         pdc = &reply.req.response2;
 167
 168         /* TODO: accurately depict which services we are running */
 169         pdc->server_type      =
 170                 NBT_SERVER_PDC | NBT_SERVER_GC |
 171                 NBT_SERVER_DS | NBT_SERVER_TIMESERV |
 172                 NBT_SERVER_CLOSEST | NBT_SERVER_WRITABLE |
 173                 NBT_SERVER_GOOD_TIMESERV;
 174
 175         /* hmm, probably a better way to do this */
 176         if (str_list_check(services, "ldap")) {
 177                 pdc->server_type |= NBT_SERVER_LDAP;
 178         }
 179
 180         if (str_list_check(services, "kdc")) {
 181                 pdc->server_type |= NBT_SERVER_KDC;
 182         }
 183
 184         pdc->domain_uuid      = samdb_result_guid(dom_res[0], "objectGUID");
 185         pdc->forest           = samdb_result_string(ref_res[0], "dnsRoot", lp_realm());
 186         pdc->dns_domain       = samdb_result_string(ref_res[0], "dnsRoot", lp_realm());
 187
 188         /* TODO: get our full DNS name from somewhere else */
 189         pdc->pdc_dns_name     = talloc_asprintf(packet, "%s.%s",
 190                                                 strlower_talloc(packet, lp_netbios_name()),
 191                                                 pdc->dns_domain);
 192         pdc->domain           = samdb_result_string(ref_res[0], "nETBIOSName", name->name);;
 193         pdc->pdc_name         = lp_netbios_name();
 194         pdc->user_name        = netlogon->req.pdc2.user_name;
 195         /* TODO: we need to make sure these are in our DNS zone */
 196         pdc->server_site      = "Default-First-Site-Name";
 197         pdc->client_site      = "Default-First-Site-Name";
 198         pdc->unknown          = 0x10; /* what is this? */
 199         pdc->unknown2         = 2; /* and this ... */
 200         pdc->pdc_ip           = my_ip;
 201         pdc->nt_version       = 13;
 202         pdc->lmnt_token       = 0xFFFF;
 203         pdc->lm20_token       = 0xFFFF;
 204
 205         packet->data.msg.dest_name.type = 0;
 206
 207         dgram_mailslot_netlogon_reply(reply_iface->dgmsock,
 208                                       packet,
 209                                       netlogon->req.pdc2.mailslot_name,
 210                                       &reply);
 211 }
 212
 213
 214 /*
 215   handle incoming netlogon mailslot requests
 216 */
 217 void nbtd_mailslot_netlogon_handler(struct dgram_mailslot_handler *dgmslot,
 218                                     struct nbt_dgram_packet *packet,
 219                                     struct socket_address *src)
 220 {
 221         NTSTATUS status = NT_STATUS_NO_MEMORY;
 222         struct nbtd_interface *iface =
 223                 talloc_get_type(dgmslot->private, struct nbtd_interface);
 224         struct nbt_netlogon_packet *netlogon =
 225                 talloc(dgmslot, struct nbt_netlogon_packet);
 226         struct nbtd_iface_name *iname;
 227         struct nbt_name *name = &packet->data.msg.dest_name;
 228
 229         if (netlogon == NULL) goto failed;
 230
 231         /*
 232           see if the we are listening on the destination netbios name
 233         */
 234         iname = nbtd_find_iname(iface, name, 0);
 235         if (iname == NULL) {
 236                 status = NT_STATUS_BAD_NETWORK_NAME;
 237                 goto failed;
 238         }
 239
 240         DEBUG(2,("netlogon request to %s from %s:%d\n",
 241                  nbt_name_string(netlogon, name), src->addr, src->port));
 242         status = dgram_mailslot_netlogon_parse(dgmslot, netlogon, packet, netlogon);
 243         if (!NT_STATUS_IS_OK(status)) goto failed;
 244
 245         switch (netlogon->command) {
 246         case NETLOGON_QUERY_FOR_PDC:
 247                 nbtd_netlogon_getdc(dgmslot, iface, packet, src, netlogon);
 248                 break;
 249         case NETLOGON_QUERY_FOR_PDC2:
 250                 nbtd_netlogon_getdc2(dgmslot, iface, packet, src, netlogon);
 251                 break;
 252         default:
 253                 DEBUG(2,("unknown netlogon op %d from %s:%d\n",
 254                          netlogon->command, src->addr, src->port));
 255                 NDR_PRINT_DEBUG(nbt_netlogon_packet, netlogon);
 256                 break;
 257         }
 258
 259         talloc_free(netlogon);
 260         return;
 261
 262 failed:
 263         DEBUG(2,("nbtd netlogon handler failed from %s:%d to %s - %s\n",
 264                  src->addr, src->port, nbt_name_string(netlogon, name),
 265                  nt_errstr(status)));
 266         talloc_free(netlogon);
 267 }