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
  29 /*
  30   reply to a GETDC request
  31  */
  32 static void nbtd_netlogon_getdc(struct dgram_mailslot_handler *dgmslot,
  33                                 struct nbt_dgram_packet *packet,
  34                                 const char *src_address, int src_port,
  35                                 struct nbt_netlogon_packet *netlogon)
  36 {
  37         struct nbt_name *name = &packet->data.msg.dest_name;
  38         struct nbt_netlogon_packet reply;
  39         struct nbt_netlogon_response_from_pdc *pdc;
  40
  41         /* only answer getdc requests on the PDC or LOGON names */
  42         if (name->type != NBT_NAME_PDC && name->type != NBT_NAME_LOGON) {
  43                 return;
  44         }
  45
  46         /* setup a GETDC reply */
  47         ZERO_STRUCT(reply);
  48         reply.command = NETLOGON_RESPONSE_FROM_PDC;
  49         pdc = &reply.req.response;
  50
  51         pdc->pdc_name         = lp_netbios_name();
  52         pdc->unicode_pdc_name = pdc->pdc_name;
  53         pdc->domain_name      = lp_workgroup();
  54         pdc->nt_version       = 1;
  55         pdc->lmnt_token       = 0xFFFF;
  56         pdc->lm20_token       = 0xFFFF;
  57
  58
  59         packet->data.msg.dest_name.type = 0;
  60
  61         dgram_mailslot_netlogon_reply(dgmslot->dgmsock,
  62                                       packet,
  63                                       netlogon->req.pdc.mailslot_name,
  64                                       &reply);
  65 }
  66
  67
  68 /*
  69   reply to a ADS style GETDC request
  70  */
  71 static void nbtd_netlogon_getdc2(struct dgram_mailslot_handler *dgmslot,
  72                                  struct nbt_dgram_packet *packet,
  73                                  const char *src_address, int src_port,
  74                                  struct nbt_netlogon_packet *netlogon)
  75 {
  76         struct nbt_name *name = &packet->data.msg.dest_name;
  77         struct nbt_netlogon_packet reply;
  78         struct nbt_netlogon_response_from_pdc2 *pdc;
  79         struct ldb_context *samctx;
  80         const char *attrs[] = {"realm", "dnsDomain", "objectGUID", NULL};
  81         struct ldb_message **res;
  82         int ret;
  83         const char **services = lp_server_services();
  84
  85         /* only answer getdc requests on the PDC or LOGON names */
  86         if (name->type != NBT_NAME_PDC && name->type != NBT_NAME_LOGON) {
  87                 return;
  88         }
  89
  90         samctx = samdb_connect(packet);
  91         if (samctx == NULL) {
  92                 DEBUG(2,("Unable to open sam in getdc reply\n"));
  93                 return;
  94         }
  95
  96         /* try and find the domain */
  97         ret = gendb_search(samctx, samctx, NULL, &res, attrs,
  98                            "(&(name=%s)(objectClass=domainDNS))", name->name);
  99         if (ret != 1) {
 100                 DEBUG(2,("Unable to find domain '%s' in sam\n", name->name));
 101                 return;
 102         }
 103
 104         /* setup a GETDC reply */
 105         ZERO_STRUCT(reply);
 106         if (netlogon->req.pdc2.user_name[0]) {
 107                 reply.command = NETLOGON_RESPONSE_FROM_PDC_USER;
 108         } else {
 109                 reply.command = NETLOGON_RESPONSE_FROM_PDC2;
 110         }
 111         pdc = &reply.req.response2;
 112
 113         /* TODO: accurately depict which services we are running */
 114         pdc->server_type      =
 115                 NBT_SERVER_PDC | NBT_SERVER_GC |
 116                 NBT_SERVER_DS | NBT_SERVER_TIMESERV |
 117                 NBT_SERVER_CLOSEST | NBT_SERVER_WRITABLE |
 118                 NBT_SERVER_GOOD_TIMESERV;
 119
 120         /* hmm, probably a better way to do this */
 121         if (lp_parm_bool(-1, "krb5", "kdc", True)) {
 122                 pdc->server_type |= NBT_SERVER_KDC;
 123         }
 124         if (str_list_check(services, "ldap")) {
 125                 pdc->server_type |= NBT_SERVER_LDAP;
 126         }
 127
 128         pdc->domain_uuid      = samdb_result_guid(res[0], "objectGUID");
 129         pdc->forest           = samdb_result_string(res[0], "realm", lp_realm());
 130         pdc->dns_domain       = samdb_result_string(res[0], "dnsDomain", lp_realm());
 131
 132         /* TODO: get our full DNS name from somewhere else */
 133         pdc->pdc_dns_name     = talloc_asprintf(packet, "%s.%s",
 134                                                 lp_netbios_name(), pdc->dns_domain);
 135         pdc->domain           = name->name;
 136         pdc->pdc_name         = lp_netbios_name();
 137         pdc->user_name        = netlogon->req.pdc2.user_name;
 138         /* TODO: we need to make sure these are in our DNS zone */
 139         pdc->site_name        = "Default-First-Site-Name";
 140         pdc->site_name2       = "Default-First-Site-Name";
 141         pdc->unknown          = 0x10; /* what is this? */
 142         pdc->unknown2         = 2; /* and this ... */
 143         pdc->pdc_ip           = socket_get_my_addr(dgmslot->dgmsock->sock, packet);
 144         pdc->nt_version       = 13;
 145         pdc->lmnt_token       = 0xFFFF;
 146         pdc->lm20_token       = 0xFFFF;
 147
 148         packet->data.msg.dest_name.type = 0;
 149
 150         dgram_mailslot_netlogon_reply(dgmslot->dgmsock,
 151                                       packet,
 152                                       netlogon->req.pdc2.mailslot_name,
 153                                       &reply);
 154 }
 155
 156
 157 /*
 158   handle incoming netlogon mailslot requests
 159 */
 160 void nbtd_mailslot_netlogon_handler(struct dgram_mailslot_handler *dgmslot,
 161                                     struct nbt_dgram_packet *packet,
 162                                     const char *src_address, int src_port)
 163 {
 164         NTSTATUS status = NT_STATUS_NO_MEMORY;
 165         struct nbtd_interface *iface =
 166                 talloc_get_type(dgmslot->private, struct nbtd_interface);
 167         struct nbt_netlogon_packet *netlogon =
 168                 talloc(dgmslot, struct nbt_netlogon_packet);
 169         struct nbtd_iface_name *iname;
 170         struct nbt_name *name = &packet->data.msg.dest_name;
 171
 172         if (netlogon == NULL) goto failed;
 173
 174         /*
 175           see if the we are listening on the destination netbios name
 176         */
 177         iname = nbtd_find_iname(iface, name, 0);
 178         if (iname == NULL) {
 179                 status = NT_STATUS_BAD_NETWORK_NAME;
 180                 goto failed;
 181         }
 182
 183         DEBUG(2,("netlogon request to %s from %s:%d\n",
 184                  nbt_name_string(netlogon, name), src_address, src_port));
 185         status = dgram_mailslot_netlogon_parse(dgmslot, netlogon, packet, netlogon);
 186         if (!NT_STATUS_IS_OK(status)) goto failed;
 187
 188         switch (netlogon->command) {
 189         case NETLOGON_QUERY_FOR_PDC:
 190                 nbtd_netlogon_getdc(dgmslot, packet, src_address, src_port, netlogon);
 191                 break;
 192         case NETLOGON_QUERY_FOR_PDC2:
 193                 nbtd_netlogon_getdc2(dgmslot, packet, src_address, src_port, netlogon);
 194                 break;
 195         default:
 196                 DEBUG(2,("unknown netlogon op %d from %s:%d\n",
 197                          netlogon->command, src_address, src_port));
 198                 NDR_PRINT_DEBUG(nbt_netlogon_packet, netlogon);
 199                 break;
 200         }
 201
 202         talloc_free(netlogon);
 203         return;
 204
 205 failed:
 206         DEBUG(2,("nbtd netlogon handler failed from %s:%d - %s\n",
 207                  src_address, src_port, nt_errstr(status)));
 208         talloc_free(netlogon);
 209 }