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
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "nbt_server/nbt_server.h"
  24 #include "lib/socket/socket.h"
  25 #include "lib/ldb/include/ldb.h"
  26 #include "dsdb/samdb/samdb.h"
  27 #include "auth/auth.h"
  28 #include "util/util_ldb.h"
  29 #include "librpc/gen_ndr/ndr_nbt.h"
  30 #include "param/param.h"
  31 #include "smbd/service_task.h"
  32
  33 /*
  34   reply to a GETDC request
  35  */
  36 static void nbtd_netlogon_getdc(struct dgram_mailslot_handler *dgmslot,
  37                                 struct nbtd_interface *iface,
  38                                 struct nbt_dgram_packet *packet,
  39                                 const struct socket_address *src,
  40                                 struct nbt_netlogon_packet *netlogon)
  41 {
  42         struct nbt_name *name = &packet->data.msg.dest_name;
  43         struct nbtd_interface *reply_iface = nbtd_find_reply_iface(iface, src->addr, false);
  44         struct nbt_netlogon_packet reply;
  45         struct nbt_netlogon_response_from_pdc *pdc;
  46         const char *ref_attrs[] = {"nETBIOSName", NULL};
  47         struct ldb_message **ref_res;
  48         struct ldb_context *samctx;
  49         struct ldb_dn *partitions_basedn;
  50         int ret;
  51
  52         /* only answer getdc requests on the PDC or LOGON names */
  53         if (name->type != NBT_NAME_PDC && name->type != NBT_NAME_LOGON) {
  54                 return;
  55         }
  56
  57         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));
  58         if (samctx == NULL) {
  59                 DEBUG(2,("Unable to open sam in getdc reply\n"));
  60                 return;
  61         }
  62
  63         partitions_basedn = samdb_partitions_dn(samctx, packet);
  64
  65         ret = gendb_search(samctx, packet, partitions_basedn, &ref_res, ref_attrs,
  66                            "(&(&(nETBIOSName=%s)(objectclass=crossRef))(ncName=*))",
  67                            name->name);
  68
  69         if (ret != 1) {
  70                 DEBUG(2,("Unable to find domain reference '%s' in sam\n", name->name));
  71                 return;
  72         }
  73
  74         /* setup a GETDC reply */
  75         ZERO_STRUCT(reply);
  76         reply.command = NETLOGON_RESPONSE_FROM_PDC;
  77         pdc = &reply.req.response;
  78
  79         pdc->pdc_name         = lp_netbios_name(iface->nbtsrv->task->lp_ctx);
  80         pdc->unicode_pdc_name = pdc->pdc_name;
  81         pdc->domain_name      = samdb_result_string(ref_res[0], "nETBIOSName", name->name);;
  82         pdc->nt_version       = 1;
  83         pdc->lmnt_token       = 0xFFFF;
  84         pdc->lm20_token       = 0xFFFF;
  85
  86
  87         packet->data.msg.dest_name.type = 0;
  88
  89         dgram_mailslot_netlogon_reply(reply_iface->dgmsock,
  90                                       packet,
  91                                       lp_netbios_name(iface->nbtsrv->task->lp_ctx),
  92                                       netlogon->req.pdc.mailslot_name,
  93                                       &reply);
  94 }
  95
  96
  97 /*
  98   reply to a ADS style GETDC request
  99  */
 100 static void nbtd_netlogon_getdc2(struct dgram_mailslot_handler *dgmslot,
 101                                  struct nbtd_interface *iface,
 102                                  struct nbt_dgram_packet *packet,
 103                                  const struct socket_address *src,
 104                                  struct nbt_netlogon_packet *netlogon)
 105 {
 106         struct nbt_name *name = &packet->data.msg.dest_name;
 107         struct nbtd_interface *reply_iface = nbtd_find_reply_iface(iface, src->addr, false);
 108         struct nbt_netlogon_packet reply;
 109         struct nbt_netlogon_response_from_pdc2 *pdc;
 110         struct ldb_context *samctx;
 111         const char *ref_attrs[] = {"nETBIOSName", "dnsRoot", "ncName", NULL};
 112         const char *dom_attrs[] = {"objectGUID", NULL};
 113         struct ldb_message **ref_res, **dom_res;
 114         int ret;
 115         const char **services = lp_server_services(iface->nbtsrv->task->lp_ctx);
 116         const char *my_ip = reply_iface->ip_address;
 117         struct ldb_dn *partitions_basedn;
 118         if (!my_ip) {
 119                 DEBUG(0, ("Could not obtain own IP address for datagram socket\n"));
 120                 return;
 121         }
 122
 123         /* only answer getdc requests on the PDC or LOGON names */
 124         if (name->type != NBT_NAME_PDC && name->type != NBT_NAME_LOGON) {
 125                 return;
 126         }
 127
 128         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));
 129         if (samctx == NULL) {
 130                 DEBUG(2,("Unable to open sam in getdc reply\n"));
 131                 return;
 132         }
 133
 134         partitions_basedn = samdb_partitions_dn(samctx, packet);
 135
 136         ret = gendb_search(samctx, packet, partitions_basedn, &ref_res, ref_attrs,
 137                                   "(&(&(nETBIOSName=%s)(objectclass=crossRef))(ncName=*))",
 138                                   name->name);
 139
 140         if (ret != 1) {
 141                 DEBUG(2,("Unable to find domain reference '%s' in sam\n", name->name));
 142                 return;
 143         }
 144
 145         /* try and find the domain */
 146         ret = gendb_search_dn(samctx, packet,
 147                               samdb_result_dn(samctx, samctx, ref_res[0], "ncName", NULL),
 148                               &dom_res, dom_attrs);
 149         if (ret != 1) {
 150                 DEBUG(2,("Unable to find domain from reference '%s' in sam\n",
 151                          ldb_dn_get_linearized(ref_res[0]->dn)));
 152                 return;
 153         }
 154
 155         /* setup a GETDC reply */
 156         ZERO_STRUCT(reply);
 157         reply.command = NETLOGON_RESPONSE_FROM_PDC2;
 158
 159 #if 0
 160         /* newer testing shows that the reply command type is not
 161            changed based on whether a username is given in the
 162            reply. This was what was causing the w2k join to be so
 163            slow */
 164         if (netlogon->req.pdc2.user_name[0]) {
 165                 reply.command = NETLOGON_RESPONSE_FROM_PDC_USER;
 166         }
 167 #endif
 168
 169         pdc = &reply.req.response2;
 170
 171         /* TODO: accurately depict which services we are running */
 172         pdc->server_type      =
 173                 NBT_SERVER_PDC | NBT_SERVER_GC |
 174                 NBT_SERVER_DS | NBT_SERVER_TIMESERV |
 175                 NBT_SERVER_CLOSEST | NBT_SERVER_WRITABLE |
 176                 NBT_SERVER_GOOD_TIMESERV;
 177
 178         /* hmm, probably a better way to do this */
 179         if (str_list_check(services, "ldap")) {
 180                 pdc->server_type |= NBT_SERVER_LDAP;
 181         }
 182
 183         if (str_list_check(services, "kdc")) {
 184                 pdc->server_type |= NBT_SERVER_KDC;
 185         }
 186
 187         pdc->domain_uuid      = samdb_result_guid(dom_res[0], "objectGUID");
 188         pdc->forest           = samdb_result_string(ref_res[0], "dnsRoot",
 189                                                     lp_realm(iface->nbtsrv->task->lp_ctx));
 190         pdc->dns_domain       = samdb_result_string(ref_res[0], "dnsRoot",
 191                                                     lp_realm(iface->nbtsrv->task->lp_ctx));
 192
 193         /* TODO: get our full DNS name from somewhere else */
 194         pdc->pdc_dns_name     = talloc_asprintf(packet, "%s.%s",
 195                                                 strlower_talloc(packet,
 196                                                                 lp_netbios_name(iface->nbtsrv->task->lp_ctx)),
 197                                                 pdc->dns_domain);
 198         pdc->domain           = samdb_result_string(ref_res[0], "nETBIOSName", name->name);;
 199         pdc->pdc_name         = lp_netbios_name(iface->nbtsrv->task->lp_ctx);
 200         pdc->user_name        = netlogon->req.pdc2.user_name;
 201         /* TODO: we need to make sure these are in our DNS zone */
 202         pdc->server_site      = "Default-First-Site-Name";
 203         pdc->client_site      = "Default-First-Site-Name";
 204         pdc->unknown          = 0x10; /* what is this? */
 205         pdc->unknown2         = 2; /* and this ... */
 206         pdc->pdc_ip           = my_ip;
 207         pdc->nt_version       = 13;
 208         pdc->lmnt_token       = 0xFFFF;
 209         pdc->lm20_token       = 0xFFFF;
 210
 211         packet->data.msg.dest_name.type = 0;
 212
 213         dgram_mailslot_netlogon_reply(reply_iface->dgmsock,
 214                                       packet,
 215                                       lp_netbios_name(iface->nbtsrv->task->lp_ctx),
 216                                       netlogon->req.pdc2.mailslot_name,
 217                                       &reply);
 218 }
 219
 220
 221 /*
 222   handle incoming netlogon mailslot requests
 223 */
 224 void nbtd_mailslot_netlogon_handler(struct dgram_mailslot_handler *dgmslot,
 225                                     struct nbt_dgram_packet *packet,
 226                                     struct socket_address *src)
 227 {
 228         NTSTATUS status = NT_STATUS_NO_MEMORY;
 229         struct nbtd_interface *iface =
 230                 talloc_get_type(dgmslot->private, struct nbtd_interface);
 231         struct nbt_netlogon_packet *netlogon =
 232                 talloc(dgmslot, struct nbt_netlogon_packet);
 233         struct nbtd_iface_name *iname;
 234         struct nbt_name *name = &packet->data.msg.dest_name;
 235
 236         if (netlogon == NULL) goto failed;
 237
 238         /*
 239           see if the we are listening on the destination netbios name
 240         */
 241         iname = nbtd_find_iname(iface, name, 0);
 242         if (iname == NULL) {
 243                 status = NT_STATUS_BAD_NETWORK_NAME;
 244                 goto failed;
 245         }
 246
 247         DEBUG(2,("netlogon request to %s from %s:%d\n",
 248                  nbt_name_string(netlogon, name), src->addr, src->port));
 249         status = dgram_mailslot_netlogon_parse(dgmslot, netlogon, packet, netlogon);
 250         if (!NT_STATUS_IS_OK(status)) goto failed;
 251
 252         switch (netlogon->command) {
 253         case NETLOGON_QUERY_FOR_PDC:
 254                 nbtd_netlogon_getdc(dgmslot, iface, packet, src, netlogon);
 255                 break;
 256         case NETLOGON_QUERY_FOR_PDC2:
 257                 nbtd_netlogon_getdc2(dgmslot, iface, packet, src, netlogon);
 258                 break;
 259         default:
 260                 DEBUG(2,("unknown netlogon op %d from %s:%d\n",
 261                          netlogon->command, src->addr, src->port));
 262                 NDR_PRINT_DEBUG(nbt_netlogon_packet, netlogon);
 263                 break;
 264         }
 265
 266         talloc_free(netlogon);
 267         return;
 268
 269 failed:
 270         DEBUG(2,("nbtd netlogon handler failed from %s:%d to %s - %s\n",
 271                  src->addr, src->port, nbt_name_string(netlogon, name),
 272                  nt_errstr(status)));
 273         talloc_free(netlogon);
 274 }