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 "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 char *mailslot_name,
  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         const char *ref_attrs[] = {"nETBIOSName", NULL};
  49         struct ldb_message **ref_res;
  50         struct ldb_context *samctx;
  51         struct ldb_dn *partitions_basedn;
  52         struct nbt_netlogon_response netlogon_response;
  53         int ret;
  54
  55         /* only answer getdc requests on the PDC or LOGON names */
  56         if (name->type != NBT_NAME_PDC && name->type != NBT_NAME_LOGON) {
  57                 return;
  58         }
  59
  60         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));
  61         if (samctx == NULL) {
  62                 DEBUG(2,("Unable to open sam in getdc reply\n"));
  63                 return;
  64         }
  65
  66         if (!samdb_is_pdc(samctx)) {
  67                 DEBUG(2, ("Not a PDC, so not processing LOGON_PRIMARY_QUERY\n"));
  68                 return;
  69         }
  70
  71         partitions_basedn = samdb_partitions_dn(samctx, packet);
  72
  73         ret = gendb_search(samctx, packet, partitions_basedn, &ref_res, ref_attrs,
  74                            "(&(&(nETBIOSName=%s)(objectclass=crossRef))(ncName=*))",
  75                            name->name);
  76
  77         if (ret != 1) {
  78                 DEBUG(2,("Unable to find domain reference '%s' in sam\n", name->name));
  79                 return;
  80         }
  81
  82         /* setup a GETDC reply */
  83         ZERO_STRUCT(netlogon_response);
  84         netlogon_response.response_type = NETLOGON_GET_PDC;
  85         pdc = &netlogon_response.get_pdc;
  86
  87         pdc->command = NETLOGON_RESPONSE_FROM_PDC;
  88         pdc->pdc_name         = lp_netbios_name(iface->nbtsrv->task->lp_ctx);
  89         pdc->unicode_pdc_name = pdc->pdc_name;
  90         pdc->domain_name      = samdb_result_string(ref_res[0], "nETBIOSName", name->name);;
  91         pdc->nt_version       = 1;
  92         pdc->lmnt_token       = 0xFFFF;
  93         pdc->lm20_token       = 0xFFFF;
  94
  95         dgram_mailslot_netlogon_reply(reply_iface->dgmsock,
  96                                       packet,
  97                                       lp_netbios_name(iface->nbtsrv->task->lp_ctx),
  98                                       netlogon->req.pdc.mailslot_name,
  99                                       &netlogon_response);
 100 }
 101
 102
 103 /*
 104   reply to a ADS style GETDC request
 105  */
 106 static void nbtd_netlogon_samlogon(struct dgram_mailslot_handler *dgmslot,
 107                                    struct nbtd_interface *iface,
 108                                    struct nbt_dgram_packet *packet,
 109                                    const char *mailslot_name,
 110                                    const struct socket_address *src,
 111                                    struct nbt_netlogon_packet *netlogon)
 112 {
 113         struct nbt_name *name = &packet->data.msg.dest_name;
 114         struct nbtd_interface *reply_iface = nbtd_find_reply_iface(iface, src->addr, false);
 115         struct ldb_context *samctx;
 116         const char *my_ip = reply_iface->ip_address;
 117         struct dom_sid *sid;
 118         struct nbt_netlogon_response netlogon_response;
 119         NTSTATUS status;
 120
 121         if (!my_ip) {
 122                 DEBUG(0, ("Could not obtain own IP address for datagram socket\n"));
 123                 return;
 124         }
 125
 126         /* only answer getdc requests on the PDC or LOGON names */
 127         if (name->type != NBT_NAME_PDC && name->type != NBT_NAME_LOGON) {
 128                 return;
 129         }
 130
 131         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));
 132         if (samctx == NULL) {
 133                 DEBUG(2,("Unable to open sam in getdc reply\n"));
 134                 return;
 135         }
 136
 137         if (netlogon->req.logon.sid_size) {
 138                 if (strcasecmp(mailslot_name, NBT_MAILSLOT_NTLOGON) == 0) {
 139                         DEBUG(2,("NBT netlogon query failed because SID specified in request to NTLOGON\n"));
 140                         /* SID not permitted on NTLOGON (for some reason...) */
 141                         return;
 142                 }
 143                 sid = &netlogon->req.logon.sid;
 144         } else {
 145                 sid = NULL;
 146         }
 147
 148         status = fill_netlogon_samlogon_response(samctx, packet, NULL, name->name, sid, NULL,
 149                                                  netlogon->req.logon.user_name, src->addr,
 150                                                  netlogon->req.logon.nt_version, iface->nbtsrv->task->lp_ctx, &netlogon_response.samlogon);
 151         if (!NT_STATUS_IS_OK(status)) {
 152                 DEBUG(2,("NBT netlogon query failed domain=%s sid=%s version=%d - %s\n",
 153                          name->name, dom_sid_string(packet, sid), netlogon->req.logon.nt_version, nt_errstr(status)));
 154                 return;
 155         }
 156
 157         netlogon_response.response_type = NETLOGON_SAMLOGON;
 158
 159         packet->data.msg.dest_name.type = 0;
 160
 161         dgram_mailslot_netlogon_reply(reply_iface->dgmsock,
 162                                       packet,
 163                                       lp_netbios_name(iface->nbtsrv->task->lp_ctx),
 164                                       netlogon->req.logon.mailslot_name,
 165                                       &netlogon_response);
 166 }
 167
 168
 169 /*
 170   handle incoming netlogon mailslot requests
 171 */
 172 void nbtd_mailslot_netlogon_handler(struct dgram_mailslot_handler *dgmslot,
 173                                     struct nbt_dgram_packet *packet,
 174                                     const char *mailslot_name,
 175                                     struct socket_address *src)
 176 {
 177         NTSTATUS status = NT_STATUS_NO_MEMORY;
 178         struct nbtd_interface *iface =
 179                 talloc_get_type(dgmslot->private, struct nbtd_interface);
 180         struct nbt_netlogon_packet *netlogon =
 181                 talloc(dgmslot, struct nbt_netlogon_packet);
 182         struct nbtd_iface_name *iname;
 183         struct nbt_name *name = &packet->data.msg.dest_name;
 184
 185         if (netlogon == NULL) goto failed;
 186
 187         /*
 188           see if the we are listening on the destination netbios name
 189         */
 190         iname = nbtd_find_iname(iface, name, 0);
 191         if (iname == NULL) {
 192                 status = NT_STATUS_BAD_NETWORK_NAME;
 193                 goto failed;
 194         }
 195
 196         DEBUG(2,("netlogon request to %s from %s:%d\n",
 197                  nbt_name_string(netlogon, name), src->addr, src->port));
 198         status = dgram_mailslot_netlogon_parse_request(dgmslot, netlogon, packet, netlogon);
 199         if (!NT_STATUS_IS_OK(status)) goto failed;
 200
 201         switch (netlogon->command) {
 202         case LOGON_PRIMARY_QUERY:
 203                 nbtd_netlogon_getdc(dgmslot, iface, packet, mailslot_name,
 204                                     src, netlogon);
 205                 break;
 206         case LOGON_SAM_LOGON_REQUEST:
 207                 nbtd_netlogon_samlogon(dgmslot, iface, packet, mailslot_name,
 208                                        src, netlogon);
 209                 break;
 210         default:
 211                 DEBUG(2,("unknown netlogon op %d from %s:%d\n",
 212                          netlogon->command, src->addr, src->port));
 213                 NDR_PRINT_DEBUG(nbt_netlogon_packet, netlogon);
 214                 break;
 215         }
 216
 217         talloc_free(netlogon);
 218         return;
 219
 220 failed:
 221         DEBUG(2,("nbtd netlogon handler failed from %s:%d to %s - %s\n",
 222                  src->addr, src->port, nbt_name_string(netlogon, name),
 223                  nt_errstr(status)));
 224         talloc_free(netlogon);
 225 }