source4/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 2 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, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "includes.h"
  24 #include "dlinklist.h"
  25 #include "nbt_server/nbt_server.h"
  26 #include "smbd/service_task.h"
  27 #include "lib/socket/socket.h"
  28 #include "lib/ldb/include/ldb.h"
  29
  30 /*
  31   reply to a GETDC request
  32  */
  33 static void nbtd_netlogon_getdc(struct dgram_mailslot_handler *dgmslot,
  34                                 struct nbt_dgram_packet *packet,
  35                                 const char *src_address, int src_port,
  36                                 struct nbt_netlogon_packet *netlogon)
  37 {
  38         struct nbt_name *name = &packet->data.msg.dest_name;
  39         struct nbt_netlogon_packet reply;
  40         struct nbt_netlogon_response_from_pdc *pdc;
  41         const char *ref_attrs[] = {"nETBIOSName", NULL};
  42         struct ldb_message **ref_res;
  43         struct ldb_context *samctx;
  44         int ret;
  45
  46         /* only answer getdc requests on the PDC or LOGON names */
  47         if (name->type != NBT_NAME_PDC && name->type != NBT_NAME_LOGON) {
  48                 return;
  49         }
  50
  51         samctx = samdb_connect(packet);
  52         if (samctx == NULL) {
  53                 DEBUG(2,("Unable to open sam in getdc reply\n"));
  54                 return;
  55         }
  56
  57         ret = gendb_search(samctx, samctx, NULL, &ref_res, ref_attrs,
  58                            "(&(&(nETBIOSName=%s)(objectclass=crossRef))(ncName=*))",
  59                            name->name);
  60
  61         if (ret != 1) {
  62                 DEBUG(2,("Unable to find domain reference '%s' in sam\n", name->name));
  63                 return;
  64         }
  65
  66         /* setup a GETDC reply */
  67         ZERO_STRUCT(reply);
  68         reply.command = NETLOGON_RESPONSE_FROM_PDC;
  69         pdc = &reply.req.response;
  70
  71         pdc->pdc_name         = lp_netbios_name();
  72         pdc->unicode_pdc_name = pdc->pdc_name;
  73         pdc->domain_name      = samdb_result_string(ref_res[0], "nETBIOSName", name->name);;
  74         pdc->nt_version       = 1;
  75         pdc->lmnt_token       = 0xFFFF;
  76         pdc->lm20_token       = 0xFFFF;
  77
  78
  79         packet->data.msg.dest_name.type = 0;
  80
  81         dgram_mailslot_netlogon_reply(dgmslot->dgmsock,
  82                                       packet,
  83                                       netlogon->req.pdc.mailslot_name,
  84                                       &reply);
  85 }
  86
  87
  88 /*
  89   reply to a ADS style GETDC request
  90  */
  91 static void nbtd_netlogon_getdc2(struct dgram_mailslot_handler *dgmslot,
  92                                  struct nbt_dgram_packet *packet,
  93                                  const char *src_address, int src_port,
  94                                  struct nbt_netlogon_packet *netlogon)
  95 {
  96         struct nbt_name *name = &packet->data.msg.dest_name;
  97         struct nbt_netlogon_packet reply;
  98         struct nbt_netlogon_response_from_pdc2 *pdc;
  99         struct ldb_context *samctx;
 100         const char *ref_attrs[] = {"nETBIOSName", "ncName", NULL};
 101         const char *dom_attrs[] = {"dnsDomain", "objectGUID", NULL};
 102         struct ldb_message **ref_res, **dom_res;
 103         int ret;
 104         const char **services = lp_server_services();
 105
 106         /* only answer getdc requests on the PDC or LOGON names */
 107         if (name->type != NBT_NAME_PDC && name->type != NBT_NAME_LOGON) {
 108                 return;
 109         }
 110
 111         samctx = samdb_connect(packet);
 112         if (samctx == NULL) {
 113                 DEBUG(2,("Unable to open sam in getdc reply\n"));
 114                 return;
 115         }
 116
 117         ret = gendb_search(samctx, samctx, NULL, &ref_res, ref_attrs,
 118                                   "(&(&(nETBIOSName=%s)(objectclass=crossRef))(ncName=*))",
 119                                   name->name);
 120
 121         if (ret != 1) {
 122                 DEBUG(2,("Unable to find domain reference '%s' in sam\n", name->name));
 123                 return;
 124         }
 125
 126         /* try and find the domain */
 127         ret = gendb_search_dn(samctx, samctx,
 128                               samdb_result_dn(samctx, ref_res[0], "ncName", NULL),
 129                               &dom_res, dom_attrs);
 130         if (ret != 1) {
 131                 DEBUG(2,("Unable to find domain from reference '%s' in sam\n",
 132                          ldb_dn_linearize(samctx, ref_res[0]->dn)));
 133                 return;
 134         }
 135
 136         /* setup a GETDC reply */
 137         ZERO_STRUCT(reply);
 138         if (netlogon->req.pdc2.user_name[0]) {
 139                 reply.command = NETLOGON_RESPONSE_FROM_PDC_USER;
 140         } else {
 141                 reply.command = NETLOGON_RESPONSE_FROM_PDC2;
 142         }
 143         pdc = &reply.req.response2;
 144
 145         /* TODO: accurately depict which services we are running */
 146         pdc->server_type      =
 147                 NBT_SERVER_PDC | NBT_SERVER_GC |
 148                 NBT_SERVER_DS | NBT_SERVER_TIMESERV |
 149                 NBT_SERVER_CLOSEST | NBT_SERVER_WRITABLE |
 150                 NBT_SERVER_GOOD_TIMESERV;
 151
 152         /* hmm, probably a better way to do this */
 153         if (str_list_check(services, "ldap")) {
 154                 pdc->server_type |= NBT_SERVER_LDAP;
 155         }
 156
 157         if (str_list_check(services, "kdc")) {
 158                 pdc->server_type |= NBT_SERVER_KDC;
 159         }
 160
 161         pdc->domain_uuid      = samdb_result_guid(dom_res[0], "objectGUID");
 162         pdc->forest           = samdb_result_string(dom_res[0], "dnsDomain", lp_realm());
 163         pdc->dns_domain       = samdb_result_string(dom_res[0], "dnsDomain", lp_realm());
 164
 165         /* TODO: get our full DNS name from somewhere else */
 166         pdc->pdc_dns_name     = talloc_asprintf(packet, "%s.%s",
 167                                                 strlower_talloc(packet, lp_netbios_name()),
 168                                                 pdc->dns_domain);
 169         pdc->domain           = samdb_result_string(dom_res[0], "nETBIOSName", name->name);;
 170         pdc->pdc_name         = lp_netbios_name();
 171         pdc->user_name        = netlogon->req.pdc2.user_name;
 172         /* TODO: we need to make sure these are in our DNS zone */
 173         pdc->site_name        = "Default-First-Site-Name";
 174         pdc->site_name2       = "Default-First-Site-Name";
 175         pdc->unknown          = 0x10; /* what is this? */
 176         pdc->unknown2         = 2; /* and this ... */
 177         pdc->pdc_ip           = socket_get_my_addr(dgmslot->dgmsock->sock, packet);
 178         pdc->nt_version       = 13;
 179         pdc->lmnt_token       = 0xFFFF;
 180         pdc->lm20_token       = 0xFFFF;
 181
 182         packet->data.msg.dest_name.type = 0;
 183
 184         dgram_mailslot_netlogon_reply(dgmslot->dgmsock,
 185                                       packet,
 186                                       netlogon->req.pdc2.mailslot_name,
 187                                       &reply);
 188 }
 189
 190
 191 /*
 192   handle incoming netlogon mailslot requests
 193 */
 194 void nbtd_mailslot_netlogon_handler(struct dgram_mailslot_handler *dgmslot,
 195                                     struct nbt_dgram_packet *packet,
 196                                     const char *src_address, int src_port)
 197 {
 198         NTSTATUS status = NT_STATUS_NO_MEMORY;
 199         struct nbtd_interface *iface =
 200                 talloc_get_type(dgmslot->private, struct nbtd_interface);
 201         struct nbt_netlogon_packet *netlogon =
 202                 talloc(dgmslot, struct nbt_netlogon_packet);
 203         struct nbtd_iface_name *iname;
 204         struct nbt_name *name = &packet->data.msg.dest_name;
 205
 206         if (netlogon == NULL) goto failed;
 207
 208         /*
 209           see if the we are listening on the destination netbios name
 210         */
 211         iname = nbtd_find_iname(iface, name, 0);
 212         if (iname == NULL) {
 213                 status = NT_STATUS_BAD_NETWORK_NAME;
 214                 goto failed;
 215         }
 216
 217         DEBUG(2,("netlogon request to %s from %s:%d\n",
 218                  nbt_name_string(netlogon, name), src_address, src_port));
 219         status = dgram_mailslot_netlogon_parse(dgmslot, netlogon, packet, netlogon);
 220         if (!NT_STATUS_IS_OK(status)) goto failed;
 221
 222         switch (netlogon->command) {
 223         case NETLOGON_QUERY_FOR_PDC:
 224                 nbtd_netlogon_getdc(dgmslot, packet, src_address, src_port, netlogon);
 225                 break;
 226         case NETLOGON_QUERY_FOR_PDC2:
 227                 nbtd_netlogon_getdc2(dgmslot, packet, src_address, src_port, netlogon);
 228                 break;
 229         default:
 230                 DEBUG(2,("unknown netlogon op %d from %s:%d\n",
 231                          netlogon->command, src_address, src_port));
 232                 NDR_PRINT_DEBUG(nbt_netlogon_packet, netlogon);
 233                 break;
 234         }
 235
 236         talloc_free(netlogon);
 237         return;
 238
 239 failed:
 240         DEBUG(2,("nbtd netlogon handler failed from %s:%d - %s\n",
 241                  src_address, src_port, nt_errstr(status)));
 242         talloc_free(netlogon);
 243 }