source/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 "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 = samdb_connect(packet, iface->nbtsrv->task->event_ctx, iface->nbtsrv->task->lp_ctx, anonymous_session(packet, iface->nbtsrv->task->event_ctx, iface->nbtsrv->task->lp_ctx));
  60         if (samctx == NULL) {
  61                 DEBUG(2,("Unable to open sam in getdc reply\n"));
  62                 return;
  63         }
  64
  65         if (!samdb_is_pdc(samctx)) {
  66                 DEBUG(2, ("Not a PDC, so not processing LOGON_PRIMARY_QUERY\n"));
  67                 return;
  68         }
  69
  70         partitions_basedn = samdb_partitions_dn(samctx, packet);
  71
  72         ret = gendb_search(samctx, packet, partitions_basedn, &ref_res, ref_attrs,
  73                            "(&(&(nETBIOSName=%s)(objectclass=crossRef))(ncName=*))",
  74                            name->name);
  75
  76         if (ret != 1) {
  77                 DEBUG(2,("Unable to find domain reference '%s' in sam\n", name->name));
  78                 return;
  79         }
  80
  81         /* setup a GETDC reply */
  82         ZERO_STRUCT(netlogon_response);
  83         netlogon_response.response_type = NETLOGON_GET_PDC;
  84         pdc = &netlogon_response.get_pdc;
  85
  86         pdc->command = NETLOGON_RESPONSE_FROM_PDC;
  87         pdc->pdc_name         = lp_netbios_name(iface->nbtsrv->task->lp_ctx);
  88         pdc->unicode_pdc_name = pdc->pdc_name;
  89         pdc->domain_name      = samdb_result_string(ref_res[0], "nETBIOSName", name->name);;
  90         pdc->nt_version       = 1;
  91         pdc->lmnt_token       = 0xFFFF;
  92         pdc->lm20_token       = 0xFFFF;
  93
  94         dgram_mailslot_netlogon_reply(reply_iface->dgmsock,
  95                                       packet,
  96                                       lp_netbios_name(iface->nbtsrv->task->lp_ctx),
  97                                       netlogon->req.pdc.mailslot_name,
  98                                       &netlogon_response);
  99 }
 100
 101
 102 /*
 103   reply to a ADS style GETDC request
 104  */
 105 static void nbtd_netlogon_samlogon(struct dgram_mailslot_handler *dgmslot,
 106                                    struct nbtd_interface *iface,
 107                                    struct nbt_dgram_packet *packet,
 108                                    const struct socket_address *src,
 109                                    struct nbt_netlogon_packet *netlogon)
 110 {
 111         struct nbt_name *name = &packet->data.msg.dest_name;
 112         struct nbtd_interface *reply_iface = nbtd_find_reply_iface(iface, src->addr, false);
 113         struct ldb_context *samctx;
 114         const char *my_ip = reply_iface->ip_address;
 115         struct dom_sid *sid;
 116         struct nbt_netlogon_response netlogon_response;
 117         NTSTATUS status;
 118
 119         if (!my_ip) {
 120                 DEBUG(0, ("Could not obtain own IP address for datagram socket\n"));
 121                 return;
 122         }
 123
 124         /* only answer getdc requests on the PDC or LOGON names */
 125         if (name->type != NBT_NAME_PDC && name->type != NBT_NAME_LOGON) {
 126                 return;
 127         }
 128
 129         samctx = samdb_connect(packet, iface->nbtsrv->task->event_ctx, iface->nbtsrv->task->lp_ctx, anonymous_session(packet, iface->nbtsrv->task->event_ctx, iface->nbtsrv->task->lp_ctx));
 130         if (samctx == NULL) {
 131                 DEBUG(2,("Unable to open sam in getdc reply\n"));
 132                 return;
 133         }
 134
 135         if (netlogon->req.logon.sid_size) {
 136                 if (strcasecmp(dgmslot->mailslot_name, NBT_MAILSLOT_NTLOGON) == 0) {
 137                         DEBUG(2,("NBT netlogon query failed because SID specified in request to NTLOGON\n"));
 138                         /* SID not permitted on NTLOGON (for some reason...) */
 139                         return;
 140                 }
 141                 sid = &netlogon->req.logon.sid;
 142         } else {
 143                 sid = NULL;
 144         }
 145
 146         status = fill_netlogon_samlogon_response(samctx, packet, NULL, name->name, sid, NULL,
 147                                                  netlogon->req.logon.user_name, src->addr,
 148                                                  netlogon->req.logon.nt_version, iface->nbtsrv->task->lp_ctx, &netlogon_response.samlogon);
 149         if (!NT_STATUS_IS_OK(status)) {
 150                 DEBUG(2,("NBT netlogon query failed domain=%s sid=%s version=%d - %s\n",
 151                          name->name, dom_sid_string(packet, sid), netlogon->req.logon.nt_version, nt_errstr(status)));
 152                 return;
 153         }
 154
 155         netlogon_response.response_type = NETLOGON_SAMLOGON;
 156
 157         packet->data.msg.dest_name.type = 0;
 158
 159         dgram_mailslot_netlogon_reply(reply_iface->dgmsock,
 160                                       packet,
 161                                       lp_netbios_name(iface->nbtsrv->task->lp_ctx),
 162                                       netlogon->req.logon.mailslot_name,
 163                                       &netlogon_response);
 164 }
 165
 166
 167 /*
 168   handle incoming netlogon mailslot requests
 169 */
 170 void nbtd_mailslot_netlogon_handler(struct dgram_mailslot_handler *dgmslot,
 171                                     struct nbt_dgram_packet *packet,
 172                                     struct socket_address *src)
 173 {
 174         NTSTATUS status = NT_STATUS_NO_MEMORY;
 175         struct nbtd_interface *iface =
 176                 talloc_get_type(dgmslot->private, struct nbtd_interface);
 177         struct nbt_netlogon_packet *netlogon =
 178                 talloc(dgmslot, struct nbt_netlogon_packet);
 179         struct nbtd_iface_name *iname;
 180         struct nbt_name *name = &packet->data.msg.dest_name;
 181
 182         if (netlogon == NULL) goto failed;
 183
 184         /*
 185           see if the we are listening on the destination netbios name
 186         */
 187         iname = nbtd_find_iname(iface, name, 0);
 188         if (iname == NULL) {
 189                 status = NT_STATUS_BAD_NETWORK_NAME;
 190                 goto failed;
 191         }
 192
 193         DEBUG(2,("netlogon request to %s from %s:%d\n",
 194                  nbt_name_string(netlogon, name), src->addr, src->port));
 195         status = dgram_mailslot_netlogon_parse_request(dgmslot, netlogon, packet, netlogon);
 196         if (!NT_STATUS_IS_OK(status)) goto failed;
 197
 198         switch (netlogon->command) {
 199         case LOGON_PRIMARY_QUERY:
 200                 nbtd_netlogon_getdc(dgmslot, iface, packet,
 201                                     src, netlogon);
 202                 break;
 203         case LOGON_SAM_LOGON_REQUEST:
 204                 nbtd_netlogon_samlogon(dgmslot, iface, packet,
 205                                        src, netlogon);
 206                 break;
 207         default:
 208                 DEBUG(2,("unknown netlogon op %d from %s:%d\n",
 209                          netlogon->command, src->addr, src->port));
 210                 NDR_PRINT_DEBUG(nbt_netlogon_packet, netlogon);
 211                 break;
 212         }
 213
 214         talloc_free(netlogon);
 215         return;
 216
 217 failed:
 218         DEBUG(2,("nbtd netlogon handler failed from %s:%d to %s - %s\n",
 219                  src->addr, src->port, nbt_name_string(netlogon, name),
 220                  nt_errstr(status)));
 221         talloc_free(netlogon);
 222 }