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         const struct ldb_dn *partitions_basedn = ldb_dn_string_compose(packet, samdb_base_dn(packet), "CN=Partitions,CN=Configuration");
 113         if (!my_ip) {
 114                 DEBUG(0, ("Could not obtain own IP address for datagram socket\n"));
 115                 return;
 116         }
 117
 118         /* only answer getdc requests on the PDC or LOGON names */
 119         if (name->type != NBT_NAME_PDC && name->type != NBT_NAME_LOGON) {
 120                 return;
 121         }
 122
 123         samctx = samdb_connect(packet, anonymous_session(packet));
 124         if (samctx == NULL) {
 125                 DEBUG(2,("Unable to open sam in getdc reply\n"));
 126                 return;
 127         }
 128
 129         ret = gendb_search(samctx, samctx, partitions_basedn, &ref_res, ref_attrs,
 130                                   "(&(&(nETBIOSName=%s)(objectclass=crossRef))(ncName=*))",
 131                                   name->name);
 132
 133         if (ret != 1) {
 134                 DEBUG(2,("Unable to find domain reference '%s' in sam\n", name->name));
 135                 return;
 136         }
 137
 138         /* try and find the domain */
 139         ret = gendb_search_dn(samctx, samctx,
 140                               samdb_result_dn(samctx, ref_res[0], "ncName", NULL),
 141                               &dom_res, dom_attrs);
 142         if (ret != 1) {
 143                 DEBUG(2,("Unable to find domain from reference '%s' in sam\n",
 144                          ldb_dn_linearize(samctx, ref_res[0]->dn)));
 145                 return;
 146         }
 147
 148         /* setup a GETDC reply */
 149         ZERO_STRUCT(reply);
 150         reply.command = NETLOGON_RESPONSE_FROM_PDC2;
 151
 152 #if 0
 153         /* newer testing shows that the reply command type is not
 154            changed based on whether a username is given in the
 155            reply. This was what was causing the w2k join to be so
 156            slow */
 157         if (netlogon->req.pdc2.user_name[0]) {
 158                 reply.command = NETLOGON_RESPONSE_FROM_PDC_USER;
 159         }
 160 #endif
 161
 162         pdc = &reply.req.response2;
 163
 164         /* TODO: accurately depict which services we are running */
 165         pdc->server_type      =
 166                 NBT_SERVER_PDC | NBT_SERVER_GC |
 167                 NBT_SERVER_DS | NBT_SERVER_TIMESERV |
 168                 NBT_SERVER_CLOSEST | NBT_SERVER_WRITABLE |
 169                 NBT_SERVER_GOOD_TIMESERV;
 170
 171         /* hmm, probably a better way to do this */
 172         if (str_list_check(services, "ldap")) {
 173                 pdc->server_type |= NBT_SERVER_LDAP;
 174         }
 175
 176         if (str_list_check(services, "kdc")) {
 177                 pdc->server_type |= NBT_SERVER_KDC;
 178         }
 179
 180         pdc->domain_uuid      = samdb_result_guid(dom_res[0], "objectGUID");
 181         pdc->forest           = samdb_result_string(dom_res[0], "dnsDomain", lp_realm());
 182         pdc->dns_domain       = samdb_result_string(dom_res[0], "dnsDomain", lp_realm());
 183
 184         /* TODO: get our full DNS name from somewhere else */
 185         pdc->pdc_dns_name     = talloc_asprintf(packet, "%s.%s",
 186                                                 strlower_talloc(packet, lp_netbios_name()),
 187                                                 pdc->dns_domain);
 188         pdc->domain           = samdb_result_string(dom_res[0], "nETBIOSName", name->name);;
 189         pdc->pdc_name         = lp_netbios_name();
 190         pdc->user_name        = netlogon->req.pdc2.user_name;
 191         /* TODO: we need to make sure these are in our DNS zone */
 192         pdc->site_name        = "Default-First-Site-Name";
 193         pdc->site_name2       = "Default-First-Site-Name";
 194         pdc->unknown          = 0x10; /* what is this? */
 195         pdc->unknown2         = 2; /* and this ... */
 196         pdc->pdc_ip           = my_ip;
 197         pdc->nt_version       = 13;
 198         pdc->lmnt_token       = 0xFFFF;
 199         pdc->lm20_token       = 0xFFFF;
 200
 201         packet->data.msg.dest_name.type = 0;
 202
 203         dgram_mailslot_netlogon_reply(reply_iface->dgmsock,
 204                                       packet,
 205                                       netlogon->req.pdc2.mailslot_name,
 206                                       &reply);
 207 }
 208
 209
 210 /*
 211   handle incoming netlogon mailslot requests
 212 */
 213 void nbtd_mailslot_netlogon_handler(struct dgram_mailslot_handler *dgmslot,
 214                                     struct nbt_dgram_packet *packet,
 215                                     struct socket_address *src)
 216 {
 217         NTSTATUS status = NT_STATUS_NO_MEMORY;
 218         struct nbtd_interface *iface =
 219                 talloc_get_type(dgmslot->private, struct nbtd_interface);
 220         struct nbt_netlogon_packet *netlogon =
 221                 talloc(dgmslot, struct nbt_netlogon_packet);
 222         struct nbtd_iface_name *iname;
 223         struct nbt_name *name = &packet->data.msg.dest_name;
 224
 225         if (netlogon == NULL) goto failed;
 226
 227         /*
 228           see if the we are listening on the destination netbios name
 229         */
 230         iname = nbtd_find_iname(iface, name, 0);
 231         if (iname == NULL) {
 232                 status = NT_STATUS_BAD_NETWORK_NAME;
 233                 goto failed;
 234         }
 235
 236         DEBUG(2,("netlogon request to %s from %s:%d\n",
 237                  nbt_name_string(netlogon, name), src->addr, src->port));
 238         status = dgram_mailslot_netlogon_parse(dgmslot, netlogon, packet, netlogon);
 239         if (!NT_STATUS_IS_OK(status)) goto failed;
 240
 241         switch (netlogon->command) {
 242         case NETLOGON_QUERY_FOR_PDC:
 243                 nbtd_netlogon_getdc(dgmslot, iface, packet, src, netlogon);
 244                 break;
 245         case NETLOGON_QUERY_FOR_PDC2:
 246                 nbtd_netlogon_getdc2(dgmslot, iface, packet, src, netlogon);
 247                 break;
 248         default:
 249                 DEBUG(2,("unknown netlogon op %d from %s:%d\n",
 250                          netlogon->command, src->addr, src->port));
 251                 NDR_PRINT_DEBUG(nbt_netlogon_packet, netlogon);
 252                 break;
 253         }
 254
 255         talloc_free(netlogon);
 256         return;
 257
 258 failed:
 259         DEBUG(2,("nbtd netlogon handler failed from %s:%d to %s - %s\n",
 260                  src->addr, src->port, nbt_name_string(netlogon, name),
 261                  nt_errstr(status)));
 262         talloc_free(netlogon);
 263 }