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 #include "nbt_server/dgram/proto.h"
  35
  36 /*
  37   reply to a GETDC request
  38  */
  39 static void nbtd_netlogon_getdc(struct dgram_mailslot_handler *dgmslot,
  40                                 struct nbtd_interface *iface,
  41                                 struct nbt_dgram_packet *packet,
  42                                 const struct socket_address *src,
  43                                 struct nbt_netlogon_packet *netlogon)
  44 {
  45         struct nbt_name *name = &packet->data.msg.dest_name;
  46         struct nbtd_interface *reply_iface = nbtd_find_reply_iface(iface, src->addr, false);
  47         struct nbt_netlogon_response_from_pdc *pdc;
  48         struct ldb_context *samctx;
  49         struct nbt_netlogon_response netlogon_response;
  50
  51         /* only answer getdc requests on the PDC or LOGON names */
  52         if (name->type != NBT_NAME_PDC && name->type != NBT_NAME_LOGON) {
  53                 return;
  54         }
  55
  56         samctx = iface->nbtsrv->sam_ctx;
  57
  58         if (lpcfg_server_role(iface->nbtsrv->task->lp_ctx) != ROLE_DOMAIN_CONTROLLER
  59             || !samdb_is_pdc(samctx)) {
  60                 DEBUG(2, ("Not a PDC, so not processing LOGON_PRIMARY_QUERY\n"));
  61                 return;
  62         }
  63
  64         if (strcasecmp_m(name->name, lpcfg_workgroup(iface->nbtsrv->task->lp_ctx)) != 0) {
  65                 DEBUG(5,("GetDC requested for a domian %s that we don't host\n", name->name));
  66                 return;
  67         }
  68
  69         /* setup a GETDC reply */
  70         ZERO_STRUCT(netlogon_response);
  71         netlogon_response.response_type = NETLOGON_GET_PDC;
  72         pdc = &netlogon_response.data.get_pdc;
  73
  74         pdc->command = NETLOGON_RESPONSE_FROM_PDC;
  75         pdc->pdc_name         = lpcfg_netbios_name(iface->nbtsrv->task->lp_ctx);
  76         pdc->unicode_pdc_name = pdc->pdc_name;
  77         pdc->domain_name      = lpcfg_workgroup(iface->nbtsrv->task->lp_ctx);
  78         pdc->nt_version       = 1;
  79         pdc->lmnt_token       = 0xFFFF;
  80         pdc->lm20_token       = 0xFFFF;
  81
  82         dgram_mailslot_netlogon_reply(reply_iface->dgmsock,
  83                                       packet,
  84                                       lpcfg_netbios_name(iface->nbtsrv->task->lp_ctx),
  85                                       netlogon->req.pdc.mailslot_name,
  86                                       &netlogon_response);
  87 }
  88
  89
  90 /*
  91   reply to a ADS style GETDC request
  92  */
  93 static void nbtd_netlogon_samlogon(struct dgram_mailslot_handler *dgmslot,
  94                                    struct nbtd_interface *iface,
  95                                    struct nbt_dgram_packet *packet,
  96                                    const struct socket_address *src,
  97                                    struct nbt_netlogon_packet *netlogon)
  98 {
  99         struct nbt_name *name = &packet->data.msg.dest_name;
 100         struct nbtd_interface *reply_iface = nbtd_find_reply_iface(iface, src->addr, false);
 101         struct ldb_context *samctx;
 102         const char *my_ip = reply_iface->ip_address;
 103         struct dom_sid *sid;
 104         struct nbt_netlogon_response netlogon_response;
 105         NTSTATUS status;
 106
 107         if (!my_ip) {
 108                 DEBUG(0, ("Could not obtain own IP address for datagram socket\n"));
 109                 return;
 110         }
 111
 112         /* only answer getdc requests on the PDC or LOGON names */
 113         if (name->type != NBT_NAME_PDC && name->type != NBT_NAME_LOGON) {
 114                 return;
 115         }
 116
 117         samctx = iface->nbtsrv->sam_ctx;
 118
 119         if (netlogon->req.logon.sid_size) {
 120                 sid = &netlogon->req.logon.sid;
 121         } else {
 122                 sid = NULL;
 123         }
 124
 125         status = fill_netlogon_samlogon_response(samctx, packet, NULL, name->name, sid, NULL,
 126                                                  netlogon->req.logon.user_name, netlogon->req.logon.acct_control, src->addr,
 127                                                  netlogon->req.logon.nt_version, iface->nbtsrv->task->lp_ctx, &netlogon_response.data.samlogon, false);
 128         if (!NT_STATUS_IS_OK(status)) {
 129                 DEBUG(2,("NBT netlogon query failed domain=%s sid=%s version=%d - %s\n",
 130                          name->name, dom_sid_string(packet, sid), netlogon->req.logon.nt_version, nt_errstr(status)));
 131                 return;
 132         }
 133
 134         netlogon_response.response_type = NETLOGON_SAMLOGON;
 135
 136         packet->data.msg.dest_name.type = 0;
 137
 138         dgram_mailslot_netlogon_reply(reply_iface->dgmsock,
 139                                       packet,
 140                                       lpcfg_netbios_name(iface->nbtsrv->task->lp_ctx),
 141                                       netlogon->req.logon.mailslot_name,
 142                                       &netlogon_response);
 143 }
 144
 145
 146 /*
 147   handle incoming netlogon mailslot requests
 148 */
 149 void nbtd_mailslot_netlogon_handler(struct dgram_mailslot_handler *dgmslot,
 150                                     struct nbt_dgram_packet *packet,
 151                                     struct socket_address *src)
 152 {
 153         NTSTATUS status = NT_STATUS_NO_MEMORY;
 154         struct nbtd_interface *iface =
 155                 talloc_get_type(dgmslot->private_data, struct nbtd_interface);
 156         struct nbt_netlogon_packet *netlogon =
 157                 talloc(dgmslot, struct nbt_netlogon_packet);
 158         struct nbtd_iface_name *iname;
 159         struct nbt_name *name = &packet->data.msg.dest_name;
 160
 161         if (netlogon == NULL) goto failed;
 162
 163         /*
 164           see if the we are listening on the destination netbios name
 165         */
 166         iname = nbtd_find_iname(iface, name, 0);
 167         if (iname == NULL) {
 168                 status = NT_STATUS_BAD_NETWORK_NAME;
 169                 goto failed;
 170         }
 171
 172         DEBUG(2,("netlogon request to %s from %s:%d\n",
 173                  nbt_name_string(netlogon, name), src->addr, src->port));
 174         status = dgram_mailslot_netlogon_parse_request(dgmslot, netlogon, packet, netlogon);
 175         if (!NT_STATUS_IS_OK(status)) goto failed;
 176
 177         switch (netlogon->command) {
 178         case LOGON_PRIMARY_QUERY:
 179                 nbtd_netlogon_getdc(dgmslot, iface, packet,
 180                                     src, netlogon);
 181                 break;
 182         case LOGON_SAM_LOGON_REQUEST:
 183                 nbtd_netlogon_samlogon(dgmslot, iface, packet,
 184                                        src, netlogon);
 185                 break;
 186         default:
 187                 DEBUG(2,("unknown netlogon op %d from %s:%d\n",
 188                          netlogon->command, src->addr, src->port));
 189                 NDR_PRINT_DEBUG(nbt_netlogon_packet, netlogon);
 190                 break;
 191         }
 192
 193         talloc_free(netlogon);
 194         return;
 195
 196 failed:
 197         DEBUG(2,("nbtd netlogon handler failed from %s:%d to %s - %s\n",
 198                  src->addr, src->port, nbt_name_string(netlogon, name),
 199                  nt_errstr(status)));
 200         talloc_free(netlogon);
 201 }