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 "nbt_server/nbt_server.h"
  25 #include "lib/socket/socket.h"
  26 #include "lib/ldb/include/ldb.h"
  27 #include "dsdb/samdb/samdb.h"
  28 #include "auth/auth.h"
  29 #include "db_wrap.h"
  30 #include "librpc/gen_ndr/ndr_nbt.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         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         ret = gendb_search(samctx, samctx, NULL, &ref_res, ref_attrs,
  62                            "(&(&(nETBIOSName=%s)(objectclass=crossRef))(ncName=*))",
  63                            name->name);
  64
  65         if (ret != 1) {
  66                 DEBUG(2,("Unable to find domain reference '%s' in sam\n", name->name));
  67                 return;
  68         }
  69
  70         /* setup a GETDC reply */
  71         ZERO_STRUCT(reply);
  72         reply.command = NETLOGON_RESPONSE_FROM_PDC;
  73         pdc = &reply.req.response;
  74
  75         pdc->pdc_name         = lp_netbios_name();
  76         pdc->unicode_pdc_name = pdc->pdc_name;
  77         pdc->domain_name      = samdb_result_string(ref_res[0], "nETBIOSName", name->name);;
  78         pdc->nt_version       = 1;
  79         pdc->lmnt_token       = 0xFFFF;
  80         pdc->lm20_token       = 0xFFFF;
  81
  82
  83         packet->data.msg.dest_name.type = 0;
  84
  85         dgram_mailslot_netlogon_reply(reply_iface->dgmsock,
  86                                       packet,
  87                                       netlogon->req.pdc.mailslot_name,
  88                                       &reply);
  89 }
  90
  91
  92 /*
  93   reply to a ADS style GETDC request
  94  */
  95 static void nbtd_netlogon_getdc2(struct dgram_mailslot_handler *dgmslot,
  96                                  struct nbtd_interface *iface,
  97                                  struct nbt_dgram_packet *packet,
  98                                  const struct socket_address *src,
  99                                  struct nbt_netlogon_packet *netlogon)
 100 {
 101         struct nbt_name *name = &packet->data.msg.dest_name;
 102         struct nbtd_interface *reply_iface = nbtd_find_reply_iface(iface, src->addr, False);
 103         struct nbt_netlogon_packet reply;
 104         struct nbt_netlogon_response_from_pdc2 *pdc;
 105         struct ldb_context *samctx;
 106         const char *ref_attrs[] = {"nETBIOSName", "ncName", NULL};
 107         const char *dom_attrs[] = {"dnsDomain", "objectGUID", NULL};
 108         struct ldb_message **ref_res, **dom_res;
 109         int ret;
 110         const char **services = lp_server_services();
 111         const char *my_ip = reply_iface->ip_address;
 112         if (!my_ip) {
 113                 DEBUG(0, ("Could not obtain own IP address for datagram socket\n"));
 114                 return;
 115         }
 116
 117         /* only answer getdc requests on the PDC or LOGON names */
 118         if (name->type != NBT_NAME_PDC && name->type != NBT_NAME_LOGON) {
 119                 return;
 120         }
 121
 122         samctx = samdb_connect(packet, anonymous_session(packet));
 123         if (samctx == NULL) {
 124                 DEBUG(2,("Unable to open sam in getdc reply\n"));
 125                 return;
 126         }
 127
 128         ret = gendb_search(samctx, samctx, NULL, &ref_res, ref_attrs,
 129                                   "(&(&(nETBIOSName=%s)(objectclass=crossRef))(ncName=*))",
 130                                   name->name);
 131
 132         if (ret != 1) {
 133                 DEBUG(2,("Unable to find domain reference '%s' in sam\n", name->name));
 134                 return;
 135         }
 136
 137         /* try and find the domain */
 138         ret = gendb_search_dn(samctx, samctx,
 139                               samdb_result_dn(samctx, ref_res[0], "ncName", NULL),
 140                               &dom_res, dom_attrs);
 141         if (ret != 1) {
 142                 DEBUG(2,("Unable to find domain from reference '%s' in sam\n",
 143                          ldb_dn_linearize(samctx, ref_res[0]->dn)));
 144                 return;
 145         }
 146
 147         /* setup a GETDC reply */
 148         ZERO_STRUCT(reply);
 149         reply.command = NETLOGON_RESPONSE_FROM_PDC2;
 150
 151 #if 0
 152         /* newer testing shows that the reply command type is not
 153            changed based on whether a username is given in the
 154            reply. This was what was causing the w2k join to be so
 155            slow */
 156         if (netlogon->req.pdc2.user_name[0]) {
 157                 reply.command = NETLOGON_RESPONSE_FROM_PDC_USER;
 158         }
 159 #endif
 160
 161         pdc = &reply.req.response2;
 162
 163         /* TODO: accurately depict which services we are running */
 164         pdc->server_type      =
 165                 NBT_SERVER_PDC | NBT_SERVER_GC |
 166                 NBT_SERVER_DS | NBT_SERVER_TIMESERV |
 167                 NBT_SERVER_CLOSEST | NBT_SERVER_WRITABLE |
 168                 NBT_SERVER_GOOD_TIMESERV;
 169
 170         /* hmm, probably a better way to do this */
 171         if (str_list_check(services, "ldap")) {
 172                 pdc->server_type |= NBT_SERVER_LDAP;
 173         }
 174
 175         if (str_list_check(services, "kdc")) {
 176                 pdc->server_type |= NBT_SERVER_KDC;
 177         }
 178
 179         pdc->domain_uuid      = samdb_result_guid(dom_res[0], "objectGUID");
 180         pdc->forest           = samdb_result_string(dom_res[0], "dnsDomain", lp_realm());
 181         pdc->dns_domain       = samdb_result_string(dom_res[0], "dnsDomain", lp_realm());
 182
 183         /* TODO: get our full DNS name from somewhere else */
 184         pdc->pdc_dns_name     = talloc_asprintf(packet, "%s.%s",
 185                                                 strlower_talloc(packet, lp_netbios_name()),
 186                                                 pdc->dns_domain);
 187         pdc->domain           = samdb_result_string(dom_res[0], "nETBIOSName", name->name);;
 188         pdc->pdc_name         = lp_netbios_name();
 189         pdc->user_name        = netlogon->req.pdc2.user_name;
 190         /* TODO: we need to make sure these are in our DNS zone */
 191         pdc->site_name        = "Default-First-Site-Name";
 192         pdc->site_name2       = "Default-First-Site-Name";
 193         pdc->unknown          = 0x10; /* what is this? */
 194         pdc->unknown2         = 2; /* and this ... */
 195         pdc->pdc_ip           = my_ip;
 196         pdc->nt_version       = 13;
 197         pdc->lmnt_token       = 0xFFFF;
 198         pdc->lm20_token       = 0xFFFF;
 199
 200         packet->data.msg.dest_name.type = 0;
 201
 202         dgram_mailslot_netlogon_reply(reply_iface->dgmsock,
 203                                       packet,
 204                                       netlogon->req.pdc2.mailslot_name,
 205                                       &reply);
 206 }
 207
 208
 209 /*
 210   handle incoming netlogon mailslot requests
 211 */
 212 void nbtd_mailslot_netlogon_handler(struct dgram_mailslot_handler *dgmslot,
 213                                     struct nbt_dgram_packet *packet,
 214                                     struct socket_address *src)
 215 {
 216         NTSTATUS status = NT_STATUS_NO_MEMORY;
 217         struct nbtd_interface *iface =
 218                 talloc_get_type(dgmslot->private, struct nbtd_interface);
 219         struct nbt_netlogon_packet *netlogon =
 220                 talloc(dgmslot, struct nbt_netlogon_packet);
 221         struct nbtd_iface_name *iname;
 222         struct nbt_name *name = &packet->data.msg.dest_name;
 223
 224         if (netlogon == NULL) goto failed;
 225
 226         /*
 227           see if the we are listening on the destination netbios name
 228         */
 229         iname = nbtd_find_iname(iface, name, 0);
 230         if (iname == NULL) {
 231                 status = NT_STATUS_BAD_NETWORK_NAME;
 232                 goto failed;
 233         }
 234
 235         DEBUG(2,("netlogon request to %s from %s:%d\n",
 236                  nbt_name_string(netlogon, name), src->addr, src->port));
 237         status = dgram_mailslot_netlogon_parse(dgmslot, netlogon, packet, netlogon);
 238         if (!NT_STATUS_IS_OK(status)) goto failed;
 239
 240         switch (netlogon->command) {
 241         case NETLOGON_QUERY_FOR_PDC:
 242                 nbtd_netlogon_getdc(dgmslot, iface, packet, src, netlogon);
 243                 break;
 244         case NETLOGON_QUERY_FOR_PDC2:
 245                 nbtd_netlogon_getdc2(dgmslot, iface, packet, src, netlogon);
 246                 break;
 247         default:
 248                 DEBUG(2,("unknown netlogon op %d from %s:%d\n",
 249                          netlogon->command, src->addr, src->port));
 250                 NDR_PRINT_DEBUG(nbt_netlogon_packet, netlogon);
 251                 break;
 252         }
 253
 254         talloc_free(netlogon);
 255         return;
 256
 257 failed:
 258         DEBUG(2,("nbtd netlogon handler failed from %s:%d to %s - %s\n",
 259                  src->addr, src->port, nbt_name_string(netlogon, name),
 260                  nt_errstr(status)));
 261         talloc_free(netlogon);
 262 }