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 #include "dsdb/samdb/samdb.h"
  30 #include "auth/auth.h"
  31
  32 /*
  33   reply to a GETDC request
  34  */
  35 static void nbtd_netlogon_getdc(struct dgram_mailslot_handler *dgmslot,
  36                                 struct nbt_dgram_packet *packet,
  37                                 const struct nbt_peer_socket *src,
  38                                 struct nbt_netlogon_packet *netlogon)
  39 {
  40         struct nbt_name *name = &packet->data.msg.dest_name;
  41         struct nbt_netlogon_packet reply;
  42         struct nbt_netlogon_response_from_pdc *pdc;
  43         const char *ref_attrs[] = {"nETBIOSName", NULL};
  44         struct ldb_message **ref_res;
  45         struct ldb_context *samctx;
  46         int ret;
  47
  48         /* only answer getdc requests on the PDC or LOGON names */
  49         if (name->type != NBT_NAME_PDC && name->type != NBT_NAME_LOGON) {
  50                 return;
  51         }
  52
  53         samctx = samdb_connect(packet, anonymous_session(packet));
  54         if (samctx == NULL) {
  55                 DEBUG(2,("Unable to open sam in getdc reply\n"));
  56                 return;
  57         }
  58
  59         ret = gendb_search(samctx, samctx, NULL, &ref_res, ref_attrs,
  60                            "(&(&(nETBIOSName=%s)(objectclass=crossRef))(ncName=*))",
  61                            name->name);
  62
  63         if (ret != 1) {
  64                 DEBUG(2,("Unable to find domain reference '%s' in sam\n", name->name));
  65                 return;
  66         }
  67
  68         /* setup a GETDC reply */
  69         ZERO_STRUCT(reply);
  70         reply.command = NETLOGON_RESPONSE_FROM_PDC;
  71         pdc = &reply.req.response;
  72
  73         pdc->pdc_name         = lp_netbios_name();
  74         pdc->unicode_pdc_name = pdc->pdc_name;
  75         pdc->domain_name      = samdb_result_string(ref_res[0], "nETBIOSName", name->name);;
  76         pdc->nt_version       = 1;
  77         pdc->lmnt_token       = 0xFFFF;
  78         pdc->lm20_token       = 0xFFFF;
  79
  80
  81         packet->data.msg.dest_name.type = 0;
  82
  83         dgram_mailslot_netlogon_reply(dgmslot->dgmsock,
  84                                       packet,
  85                                       netlogon->req.pdc.mailslot_name,
  86                                       &reply);
  87 }
  88
  89
  90 /*
  91   reply to a ADS style GETDC request
  92  */
  93 static void nbtd_netlogon_getdc2(struct dgram_mailslot_handler *dgmslot,
  94                                  struct nbt_dgram_packet *packet,
  95                                  const struct nbt_peer_socket *src,
  96                                  struct nbt_netlogon_packet *netlogon)
  97 {
  98         struct nbt_name *name = &packet->data.msg.dest_name;
  99         struct nbt_netlogon_packet reply;
 100         struct nbt_netlogon_response_from_pdc2 *pdc;
 101         struct ldb_context *samctx;
 102         const char *ref_attrs[] = {"nETBIOSName", "ncName", NULL};
 103         const char *dom_attrs[] = {"dnsDomain", "objectGUID", NULL};
 104         struct ldb_message **ref_res, **dom_res;
 105         int ret;
 106         const char **services = lp_server_services();
 107
 108         /* only answer getdc requests on the PDC or LOGON names */
 109         if (name->type != NBT_NAME_PDC && name->type != NBT_NAME_LOGON) {
 110                 return;
 111         }
 112
 113         samctx = samdb_connect(packet, anonymous_session(packet));
 114         if (samctx == NULL) {
 115                 DEBUG(2,("Unable to open sam in getdc reply\n"));
 116                 return;
 117         }
 118
 119         ret = gendb_search(samctx, samctx, NULL, &ref_res, ref_attrs,
 120                                   "(&(&(nETBIOSName=%s)(objectclass=crossRef))(ncName=*))",
 121                                   name->name);
 122
 123         if (ret != 1) {
 124                 DEBUG(2,("Unable to find domain reference '%s' in sam\n", name->name));
 125                 return;
 126         }
 127
 128         /* try and find the domain */
 129         ret = gendb_search_dn(samctx, samctx,
 130                               samdb_result_dn(samctx, ref_res[0], "ncName", NULL),
 131                               &dom_res, dom_attrs);
 132         if (ret != 1) {
 133                 DEBUG(2,("Unable to find domain from reference '%s' in sam\n",
 134                          ldb_dn_linearize(samctx, ref_res[0]->dn)));
 135                 return;
 136         }
 137
 138         /* setup a GETDC reply */
 139         ZERO_STRUCT(reply);
 140         reply.command = NETLOGON_RESPONSE_FROM_PDC2;
 141
 142 #if 0
 143         /* newer testing shows that the reply command type is not
 144            changed based on whether a username is given in the
 145            reply. This was what was causing the w2k join to be so
 146            slow */
 147         if (netlogon->req.pdc2.user_name[0]) {
 148                 reply.command = NETLOGON_RESPONSE_FROM_PDC_USER;
 149         }
 150 #endif
 151
 152         pdc = &reply.req.response2;
 153
 154         /* TODO: accurately depict which services we are running */
 155         pdc->server_type      =
 156                 NBT_SERVER_PDC | NBT_SERVER_GC |
 157                 NBT_SERVER_DS | NBT_SERVER_TIMESERV |
 158                 NBT_SERVER_CLOSEST | NBT_SERVER_WRITABLE |
 159                 NBT_SERVER_GOOD_TIMESERV;
 160
 161         /* hmm, probably a better way to do this */
 162         if (str_list_check(services, "ldap")) {
 163                 pdc->server_type |= NBT_SERVER_LDAP;
 164         }
 165
 166         if (str_list_check(services, "kdc")) {
 167                 pdc->server_type |= NBT_SERVER_KDC;
 168         }
 169
 170         pdc->domain_uuid      = samdb_result_guid(dom_res[0], "objectGUID");
 171         pdc->forest           = samdb_result_string(dom_res[0], "dnsDomain", lp_realm());
 172         pdc->dns_domain       = samdb_result_string(dom_res[0], "dnsDomain", lp_realm());
 173
 174         /* TODO: get our full DNS name from somewhere else */
 175         pdc->pdc_dns_name     = talloc_asprintf(packet, "%s.%s",
 176                                                 strlower_talloc(packet, lp_netbios_name()),
 177                                                 pdc->dns_domain);
 178         pdc->domain           = samdb_result_string(dom_res[0], "nETBIOSName", name->name);;
 179         pdc->pdc_name         = lp_netbios_name();
 180         pdc->user_name        = netlogon->req.pdc2.user_name;
 181         /* TODO: we need to make sure these are in our DNS zone */
 182         pdc->site_name        = "Default-First-Site-Name";
 183         pdc->site_name2       = "Default-First-Site-Name";
 184         pdc->unknown          = 0x10; /* what is this? */
 185         pdc->unknown2         = 2; /* and this ... */
 186         pdc->pdc_ip           = socket_get_my_addr(dgmslot->dgmsock->sock, packet);
 187         pdc->nt_version       = 13;
 188         pdc->lmnt_token       = 0xFFFF;
 189         pdc->lm20_token       = 0xFFFF;
 190
 191         packet->data.msg.dest_name.type = 0;
 192
 193         dgram_mailslot_netlogon_reply(dgmslot->dgmsock,
 194                                       packet,
 195                                       netlogon->req.pdc2.mailslot_name,
 196                                       &reply);
 197 }
 198
 199
 200 /*
 201   handle incoming netlogon mailslot requests
 202 */
 203 void nbtd_mailslot_netlogon_handler(struct dgram_mailslot_handler *dgmslot,
 204                                     struct nbt_dgram_packet *packet,
 205                                     const struct nbt_peer_socket *src)
 206 {
 207         NTSTATUS status = NT_STATUS_NO_MEMORY;
 208         struct nbtd_interface *iface =
 209                 talloc_get_type(dgmslot->private, struct nbtd_interface);
 210         struct nbt_netlogon_packet *netlogon =
 211                 talloc(dgmslot, struct nbt_netlogon_packet);
 212         struct nbtd_iface_name *iname;
 213         struct nbt_name *name = &packet->data.msg.dest_name;
 214
 215         if (netlogon == NULL) goto failed;
 216
 217         /*
 218           see if the we are listening on the destination netbios name
 219         */
 220         iname = nbtd_find_iname(iface, name, 0);
 221         if (iname == NULL) {
 222                 status = NT_STATUS_BAD_NETWORK_NAME;
 223                 goto failed;
 224         }
 225
 226         DEBUG(2,("netlogon request to %s from %s:%d\n",
 227                  nbt_name_string(netlogon, name), src->addr, src->port));
 228         status = dgram_mailslot_netlogon_parse(dgmslot, netlogon, packet, netlogon);
 229         if (!NT_STATUS_IS_OK(status)) goto failed;
 230
 231         switch (netlogon->command) {
 232         case NETLOGON_QUERY_FOR_PDC:
 233                 nbtd_netlogon_getdc(dgmslot, packet, src, netlogon);
 234                 break;
 235         case NETLOGON_QUERY_FOR_PDC2:
 236                 nbtd_netlogon_getdc2(dgmslot, packet, src, netlogon);
 237                 break;
 238         default:
 239                 DEBUG(2,("unknown netlogon op %d from %s:%d\n",
 240                          netlogon->command, src->addr, src->port));
 241                 NDR_PRINT_DEBUG(nbt_netlogon_packet, netlogon);
 242                 break;
 243         }
 244
 245         talloc_free(netlogon);
 246         return;
 247
 248 failed:
 249         DEBUG(2,("nbtd netlogon handler failed from %s:%d - %s\n",
 250                  src->addr, src->port, nt_errstr(status)));
 251         talloc_free(netlogon);
 252 }