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