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    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2008
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  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 "../lib/util/util_ldb.h"
  30 #include "param/param.h"
  31 #include "smbd/service_task.h"
  32 #include "cldap_server/cldap_server.h"
  33 #include "libcli/security/security.h"
  34
  35 /*
  36   reply to a GETDC request
  37  */
  38 static void nbtd_netlogon_getdc(struct dgram_mailslot_handler *dgmslot,
  39                                 struct nbtd_interface *iface,
  40                                 struct nbt_dgram_packet *packet,
  41                                 const struct socket_address *src,
  42                                 struct nbt_netlogon_packet *netlogon)
  43 {
  44         struct nbt_name *name = &packet->data.msg.dest_name;
  45         struct nbtd_interface *reply_iface = nbtd_find_reply_iface(iface, src->addr, false);
  46         struct nbt_netlogon_response_from_pdc *pdc;
  47         const char *ref_attrs[] = {"nETBIOSName", NULL};
  48         struct ldb_message **ref_res;
  49         struct ldb_context *samctx;
  50         struct ldb_dn *partitions_basedn;
  51         struct nbt_netlogon_response netlogon_response;
  52         int ret;
  53
  54         /* only answer getdc requests on the PDC or LOGON names */
  55         if (name->type != NBT_NAME_PDC && name->type != NBT_NAME_LOGON) {
  56                 return;
  57         }
  58
  59         samctx = iface->nbtsrv->sam_ctx;
  60
  61         if (!samdb_is_pdc(samctx)) {
  62                 DEBUG(2, ("Not a PDC, so not processing LOGON_PRIMARY_QUERY\n"));
  63                 return;
  64         }
  65
  66         partitions_basedn = samdb_partitions_dn(samctx, packet);
  67
  68         ret = gendb_search(samctx, packet, partitions_basedn, &ref_res, ref_attrs,
  69                            "(&(&(nETBIOSName=%s)(objectclass=crossRef))(ncName=*))",
  70                            name->name);
  71
  72         if (ret != 1) {
  73                 DEBUG(2,("Unable to find domain reference '%s' in sam\n", name->name));
  74                 return;
  75         }
  76
  77         /* setup a GETDC reply */
  78         ZERO_STRUCT(netlogon_response);
  79         netlogon_response.response_type = NETLOGON_GET_PDC;
  80         pdc = &netlogon_response.data.get_pdc;
  81
  82         pdc->command = NETLOGON_RESPONSE_FROM_PDC;
  83         pdc->pdc_name         = lp_netbios_name(iface->nbtsrv->task->lp_ctx);
  84         pdc->unicode_pdc_name = pdc->pdc_name;
  85         pdc->domain_name      = samdb_result_string(ref_res[0], "nETBIOSName", name->name);;
  86         pdc->nt_version       = 1;
  87         pdc->lmnt_token       = 0xFFFF;
  88         pdc->lm20_token       = 0xFFFF;
  89
  90         dgram_mailslot_netlogon_reply(reply_iface->dgmsock,
  91                                       packet,
  92                                       lp_netbios_name(iface->nbtsrv->task->lp_ctx),
  93                                       netlogon->req.pdc.mailslot_name,
  94                                       &netlogon_response);
  95 }
  96
  97
  98 /*
  99   reply to a ADS style GETDC request
 100  */
 101 static void nbtd_netlogon_samlogon(struct dgram_mailslot_handler *dgmslot,
 102                                    struct nbtd_interface *iface,
 103                                    struct nbt_dgram_packet *packet,
 104                                    const struct socket_address *src,
 105                                    struct nbt_netlogon_packet *netlogon)
 106 {
 107         struct nbt_name *name = &packet->data.msg.dest_name;
 108         struct nbtd_interface *reply_iface = nbtd_find_reply_iface(iface, src->addr, false);
 109         struct ldb_context *samctx;
 110         const char *my_ip = reply_iface->ip_address;
 111         struct dom_sid *sid;
 112         struct nbt_netlogon_response netlogon_response;
 113         NTSTATUS status;
 114
 115         if (!my_ip) {
 116                 DEBUG(0, ("Could not obtain own IP address for datagram socket\n"));
 117                 return;
 118         }
 119
 120         /* only answer getdc requests on the PDC or LOGON names */
 121         if (name->type != NBT_NAME_PDC && name->type != NBT_NAME_LOGON) {
 122                 return;
 123         }
 124
 125         samctx = iface->nbtsrv->sam_ctx;
 126
 127         if (netlogon->req.logon.sid_size) {
 128                 sid = &netlogon->req.logon.sid;
 129         } else {
 130                 sid = NULL;
 131         }
 132
 133         status = fill_netlogon_samlogon_response(samctx, packet, NULL, name->name, sid, NULL,
 134                                                  netlogon->req.logon.user_name, netlogon->req.logon.acct_control, src->addr,
 135                                                  netlogon->req.logon.nt_version, iface->nbtsrv->task->lp_ctx, &netlogon_response.data.samlogon);
 136         if (!NT_STATUS_IS_OK(status)) {
 137                 DEBUG(2,("NBT netlogon query failed domain=%s sid=%s version=%d - %s\n",
 138                          name->name, dom_sid_string(packet, sid), netlogon->req.logon.nt_version, nt_errstr(status)));
 139                 return;
 140         }
 141
 142         netlogon_response.response_type = NETLOGON_SAMLOGON;
 143
 144         packet->data.msg.dest_name.type = 0;
 145
 146         dgram_mailslot_netlogon_reply(reply_iface->dgmsock,
 147                                       packet,
 148                                       lp_netbios_name(iface->nbtsrv->task->lp_ctx),
 149                                       netlogon->req.logon.mailslot_name,
 150                                       &netlogon_response);
 151 }
 152
 153
 154 /*
 155   handle incoming netlogon mailslot requests
 156 */
 157 void nbtd_mailslot_netlogon_handler(struct dgram_mailslot_handler *dgmslot,
 158                                     struct nbt_dgram_packet *packet,
 159                                     struct socket_address *src)
 160 {
 161         NTSTATUS status = NT_STATUS_NO_MEMORY;
 162         struct nbtd_interface *iface =
 163                 talloc_get_type(dgmslot->private, struct nbtd_interface);
 164         struct nbt_netlogon_packet *netlogon =
 165                 talloc(dgmslot, struct nbt_netlogon_packet);
 166         struct nbtd_iface_name *iname;
 167         struct nbt_name *name = &packet->data.msg.dest_name;
 168
 169         if (netlogon == NULL) goto failed;
 170
 171         /*
 172           see if the we are listening on the destination netbios name
 173         */
 174         iname = nbtd_find_iname(iface, name, 0);
 175         if (iname == NULL) {
 176                 status = NT_STATUS_BAD_NETWORK_NAME;
 177                 goto failed;
 178         }
 179
 180         DEBUG(2,("netlogon request to %s from %s:%d\n",
 181                  nbt_name_string(netlogon, name), src->addr, src->port));
 182         status = dgram_mailslot_netlogon_parse_request(dgmslot, netlogon, packet, netlogon);
 183         if (!NT_STATUS_IS_OK(status)) goto failed;
 184
 185         switch (netlogon->command) {
 186         case LOGON_PRIMARY_QUERY:
 187                 nbtd_netlogon_getdc(dgmslot, iface, packet,
 188                                     src, netlogon);
 189                 break;
 190         case LOGON_SAM_LOGON_REQUEST:
 191                 nbtd_netlogon_samlogon(dgmslot, iface, packet,
 192                                        src, netlogon);
 193                 break;
 194         default:
 195                 DEBUG(2,("unknown netlogon op %d from %s:%d\n",
 196                          netlogon->command, src->addr, src->port));
 197                 NDR_PRINT_DEBUG(nbt_netlogon_packet, netlogon);
 198                 break;
 199         }
 200
 201         talloc_free(netlogon);
 202         return;
 203
 204 failed:
 205         DEBUG(2,("nbtd netlogon handler failed from %s:%d to %s - %s\n",
 206                  src->addr, src->port, nbt_name_string(netlogon, name),
 207                  nt_errstr(status)));
 208         talloc_free(netlogon);
 209 }