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 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 "util/util_ldb.h"
  29 #include "librpc/gen_ndr/ndr_nbt.h"
  30 #include "param/param.h"
  31
  32 /*
  33   reply to a GETDC request
  34  */
  35 static void nbtd_netlogon_getdc(struct dgram_mailslot_handler *dgmslot,
  36                                 struct nbtd_interface *iface,
  37                                 struct nbt_dgram_packet *packet,
  38                                 const struct socket_address *src,
  39                                 struct nbt_netlogon_packet *netlogon)
  40 {
  41         struct nbt_name *name = &packet->data.msg.dest_name;
  42         struct nbtd_interface *reply_iface = nbtd_find_reply_iface(iface, src->addr, false);
  43         struct nbt_netlogon_packet reply;
  44         struct nbt_netlogon_response_from_pdc *pdc;
  45         const char *ref_attrs[] = {"nETBIOSName", NULL};
  46         struct ldb_message **ref_res;
  47         struct ldb_context *samctx;
  48         struct ldb_dn *partitions_basedn;
  49         int ret;
  50
  51         /* only answer getdc requests on the PDC or LOGON names */
  52         if (name->type != NBT_NAME_PDC && name->type != NBT_NAME_LOGON) {
  53                 return;
  54         }
  55
  56         samctx = samdb_connect(packet, anonymous_session(packet));
  57         if (samctx == NULL) {
  58                 DEBUG(2,("Unable to open sam in getdc reply\n"));
  59                 return;
  60         }
  61
  62         partitions_basedn = samdb_partitions_dn(samctx, packet);
  63
  64         ret = gendb_search(samctx, packet, partitions_basedn, &ref_res, ref_attrs,
  65                            "(&(&(nETBIOSName=%s)(objectclass=crossRef))(ncName=*))",
  66                            name->name);
  67
  68         if (ret != 1) {
  69                 DEBUG(2,("Unable to find domain reference '%s' in sam\n", name->name));
  70                 return;
  71         }
  72
  73         /* setup a GETDC reply */
  74         ZERO_STRUCT(reply);
  75         reply.command = NETLOGON_RESPONSE_FROM_PDC;
  76         pdc = &reply.req.response;
  77
  78         pdc->pdc_name         = lp_netbios_name(global_loadparm);
  79         pdc->unicode_pdc_name = pdc->pdc_name;
  80         pdc->domain_name      = samdb_result_string(ref_res[0], "nETBIOSName", name->name);;
  81         pdc->nt_version       = 1;
  82         pdc->lmnt_token       = 0xFFFF;
  83         pdc->lm20_token       = 0xFFFF;
  84
  85
  86         packet->data.msg.dest_name.type = 0;
  87
  88         dgram_mailslot_netlogon_reply(reply_iface->dgmsock,
  89                                       packet,
  90                                       netlogon->req.pdc.mailslot_name,
  91                                       &reply);
  92 }
  93
  94
  95 /*
  96   reply to a ADS style GETDC request
  97  */
  98 static void nbtd_netlogon_getdc2(struct dgram_mailslot_handler *dgmslot,
  99                                  struct nbtd_interface *iface,
 100                                  struct nbt_dgram_packet *packet,
 101                                  const struct socket_address *src,
 102                                  struct nbt_netlogon_packet *netlogon)
 103 {
 104         struct nbt_name *name = &packet->data.msg.dest_name;
 105         struct nbtd_interface *reply_iface = nbtd_find_reply_iface(iface, src->addr, false);
 106         struct nbt_netlogon_packet reply;
 107         struct nbt_netlogon_response_from_pdc2 *pdc;
 108         struct ldb_context *samctx;
 109         const char *ref_attrs[] = {"nETBIOSName", "dnsRoot", "ncName", NULL};
 110         const char *dom_attrs[] = {"objectGUID", NULL};
 111         struct ldb_message **ref_res, **dom_res;
 112         int ret;
 113         const char **services = lp_server_services(global_loadparm);
 114         const char *my_ip = reply_iface->ip_address;
 115         struct ldb_dn *partitions_basedn;
 116         if (!my_ip) {
 117                 DEBUG(0, ("Could not obtain own IP address for datagram socket\n"));
 118                 return;
 119         }
 120
 121         /* only answer getdc requests on the PDC or LOGON names */
 122         if (name->type != NBT_NAME_PDC && name->type != NBT_NAME_LOGON) {
 123                 return;
 124         }
 125
 126         samctx = samdb_connect(packet, anonymous_session(packet));
 127         if (samctx == NULL) {
 128                 DEBUG(2,("Unable to open sam in getdc reply\n"));
 129                 return;
 130         }
 131
 132         partitions_basedn = samdb_partitions_dn(samctx, packet);
 133
 134         ret = gendb_search(samctx, packet, partitions_basedn, &ref_res, ref_attrs,
 135                                   "(&(&(nETBIOSName=%s)(objectclass=crossRef))(ncName=*))",
 136                                   name->name);
 137
 138         if (ret != 1) {
 139                 DEBUG(2,("Unable to find domain reference '%s' in sam\n", name->name));
 140                 return;
 141         }
 142
 143         /* try and find the domain */
 144         ret = gendb_search_dn(samctx, packet,
 145                               samdb_result_dn(samctx, samctx, ref_res[0], "ncName", NULL),
 146                               &dom_res, dom_attrs);
 147         if (ret != 1) {
 148                 DEBUG(2,("Unable to find domain from reference '%s' in sam\n",
 149                          ldb_dn_get_linearized(ref_res[0]->dn)));
 150                 return;
 151         }
 152
 153         /* setup a GETDC reply */
 154         ZERO_STRUCT(reply);
 155         reply.command = NETLOGON_RESPONSE_FROM_PDC2;
 156
 157 #if 0
 158         /* newer testing shows that the reply command type is not
 159            changed based on whether a username is given in the
 160            reply. This was what was causing the w2k join to be so
 161            slow */
 162         if (netlogon->req.pdc2.user_name[0]) {
 163                 reply.command = NETLOGON_RESPONSE_FROM_PDC_USER;
 164         }
 165 #endif
 166
 167         pdc = &reply.req.response2;
 168
 169         /* TODO: accurately depict which services we are running */
 170         pdc->server_type      =
 171                 NBT_SERVER_PDC | NBT_SERVER_GC |
 172                 NBT_SERVER_DS | NBT_SERVER_TIMESERV |
 173                 NBT_SERVER_CLOSEST | NBT_SERVER_WRITABLE |
 174                 NBT_SERVER_GOOD_TIMESERV;
 175
 176         /* hmm, probably a better way to do this */
 177         if (str_list_check(services, "ldap")) {
 178                 pdc->server_type |= NBT_SERVER_LDAP;
 179         }
 180
 181         if (str_list_check(services, "kdc")) {
 182                 pdc->server_type |= NBT_SERVER_KDC;
 183         }
 184
 185         pdc->domain_uuid      = samdb_result_guid(dom_res[0], "objectGUID");
 186         pdc->forest           = samdb_result_string(ref_res[0], "dnsRoot",
 187                                                     lp_realm(global_loadparm));
 188         pdc->dns_domain       = samdb_result_string(ref_res[0], "dnsRoot",
 189                                                     lp_realm(global_loadparm));
 190
 191         /* TODO: get our full DNS name from somewhere else */
 192         pdc->pdc_dns_name     = talloc_asprintf(packet, "%s.%s",
 193                                                 strlower_talloc(packet,
 194                                                                 lp_netbios_name(global_loadparm)),
 195                                                 pdc->dns_domain);
 196         pdc->domain           = samdb_result_string(ref_res[0], "nETBIOSName", name->name);;
 197         pdc->pdc_name         = lp_netbios_name(global_loadparm);
 198         pdc->user_name        = netlogon->req.pdc2.user_name;
 199         /* TODO: we need to make sure these are in our DNS zone */
 200         pdc->server_site      = "Default-First-Site-Name";
 201         pdc->client_site      = "Default-First-Site-Name";
 202         pdc->unknown          = 0x10; /* what is this? */
 203         pdc->unknown2         = 2; /* and this ... */
 204         pdc->pdc_ip           = my_ip;
 205         pdc->nt_version       = 13;
 206         pdc->lmnt_token       = 0xFFFF;
 207         pdc->lm20_token       = 0xFFFF;
 208
 209         packet->data.msg.dest_name.type = 0;
 210
 211         dgram_mailslot_netlogon_reply(reply_iface->dgmsock,
 212                                       packet,
 213                                       netlogon->req.pdc2.mailslot_name,
 214                                       &reply);
 215 }
 216
 217
 218 /*
 219   handle incoming netlogon mailslot requests
 220 */
 221 void nbtd_mailslot_netlogon_handler(struct dgram_mailslot_handler *dgmslot,
 222                                     struct nbt_dgram_packet *packet,
 223                                     struct socket_address *src)
 224 {
 225         NTSTATUS status = NT_STATUS_NO_MEMORY;
 226         struct nbtd_interface *iface =
 227                 talloc_get_type(dgmslot->private, struct nbtd_interface);
 228         struct nbt_netlogon_packet *netlogon =
 229                 talloc(dgmslot, struct nbt_netlogon_packet);
 230         struct nbtd_iface_name *iname;
 231         struct nbt_name *name = &packet->data.msg.dest_name;
 232
 233         if (netlogon == NULL) goto failed;
 234
 235         /*
 236           see if the we are listening on the destination netbios name
 237         */
 238         iname = nbtd_find_iname(iface, name, 0);
 239         if (iname == NULL) {
 240                 status = NT_STATUS_BAD_NETWORK_NAME;
 241                 goto failed;
 242         }
 243
 244         DEBUG(2,("netlogon request to %s from %s:%d\n",
 245                  nbt_name_string(netlogon, name), src->addr, src->port));
 246         status = dgram_mailslot_netlogon_parse(dgmslot, netlogon, packet, netlogon);
 247         if (!NT_STATUS_IS_OK(status)) goto failed;
 248
 249         switch (netlogon->command) {
 250         case NETLOGON_QUERY_FOR_PDC:
 251                 nbtd_netlogon_getdc(dgmslot, iface, packet, src, netlogon);
 252                 break;
 253         case NETLOGON_QUERY_FOR_PDC2:
 254                 nbtd_netlogon_getdc2(dgmslot, iface, packet, src, netlogon);
 255                 break;
 256         default:
 257                 DEBUG(2,("unknown netlogon op %d from %s:%d\n",
 258                          netlogon->command, src->addr, src->port));
 259                 NDR_PRINT_DEBUG(nbt_netlogon_packet, netlogon);
 260                 break;
 261         }
 262
 263         talloc_free(netlogon);
 264         return;
 265
 266 failed:
 267         DEBUG(2,("nbtd netlogon handler failed from %s:%d to %s - %s\n",
 268                  src->addr, src->port, nbt_name_string(netlogon, name),
 269                  nt_errstr(status)));
 270         talloc_free(netlogon);
 271 }