source4/cldap_server/cldap_server.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    CLDAP server task
   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 <talloc.h>
  24 #include "libcli/ldap/ldap.h"
  25 #include "lib/messaging/irpc.h"
  26 #include "smbd/service_task.h"
  27 #include "smbd/service.h"
  28 #include "cldap_server/cldap_server.h"
  29 #include "system/network.h"
  30 #include "lib/socket/netif.h"
  31 #include "lib/ldb/include/ldb.h"
  32 #include "lib/ldb/include/ldb_errors.h"
  33 #include "dsdb/samdb/samdb.h"
  34 #include "ldb_wrap.h"
  35 #include "auth/auth.h"
  36 #include "param/param.h"
  37 #include "../lib/tsocket/tsocket.h"
  38
  39 /*
  40   handle incoming cldap requests
  41 */
  42 static void cldapd_request_handler(struct cldap_socket *cldap,
  43                                    void *private_data,
  44                                    struct cldap_incoming *in)
  45 {
  46         struct cldapd_server *cldapd = talloc_get_type(private_data,
  47                                        struct cldapd_server);
  48         struct ldap_SearchRequest *search;
  49
  50         if (in->ldap_msg->type != LDAP_TAG_SearchRequest) {
  51                 DEBUG(0,("Invalid CLDAP request type %d from %s\n",
  52                          in->ldap_msg->type,
  53                          tsocket_address_string(in->src, in)));
  54                 cldap_error_reply(cldap, in->ldap_msg->messageid, in->src,
  55                                   LDAP_OPERATIONS_ERROR, "Invalid CLDAP request");
  56                 talloc_free(in);
  57                 return;
  58         }
  59
  60         search = &in->ldap_msg->r.SearchRequest;
  61
  62         if (strcmp("", search->basedn) != 0) {
  63                 DEBUG(0,("Invalid CLDAP basedn '%s' from %s\n",
  64                          search->basedn,
  65                          tsocket_address_string(in->src, in)));
  66                 cldap_error_reply(cldap, in->ldap_msg->messageid, in->src,
  67                                   LDAP_OPERATIONS_ERROR, "Invalid CLDAP basedn");
  68                 talloc_free(in);
  69                 return;
  70         }
  71
  72         if (search->scope != LDAP_SEARCH_SCOPE_BASE) {
  73                 DEBUG(0,("Invalid CLDAP scope %d from %s\n",
  74                          search->scope,
  75                          tsocket_address_string(in->src, in)));
  76                 cldap_error_reply(cldap, in->ldap_msg->messageid, in->src,
  77                                   LDAP_OPERATIONS_ERROR, "Invalid CLDAP scope");
  78                 talloc_free(in);
  79                 return;
  80         }
  81
  82         if (search->num_attributes == 1 &&
  83             strcasecmp(search->attributes[0], "netlogon") == 0) {
  84                 cldapd_netlogon_request(cldap,
  85                                         cldapd,
  86                                         in,
  87                                         in->ldap_msg->messageid,
  88                                         search->tree,
  89                                         in->src);
  90                 talloc_free(in);
  91                 return;
  92         }
  93
  94         cldapd_rootdse_request(cldap, cldapd, in,
  95                                in->ldap_msg->messageid,
  96                                search, in->src);
  97         talloc_free(in);
  98 }
  99
 100
 101 /*
 102   start listening on the given address
 103 */
 104 static NTSTATUS cldapd_add_socket(struct cldapd_server *cldapd, struct loadparm_context *lp_ctx,
 105                                   const char *address)
 106 {
 107         struct cldap_socket *cldapsock;
 108         struct tsocket_address *socket_address;
 109         NTSTATUS status;
 110         int ret;
 111
 112         ret = tsocket_address_inet_from_strings(cldapd,
 113                                                 "ip",
 114                                                 address,
 115                                                 lp_cldap_port(lp_ctx),
 116                                                 &socket_address);
 117         if (ret != 0) {
 118                 status = map_nt_error_from_unix(errno);
 119                 DEBUG(0,("invalid address %s:%d - %s:%s\n",
 120                          address, lp_cldap_port(lp_ctx),
 121                          gai_strerror(ret), nt_errstr(status)));
 122                 return status;
 123         }
 124
 125         /* listen for unicasts on the CLDAP port (389) */
 126         status = cldap_socket_init(cldapd,
 127                                    cldapd->task->event_ctx,
 128                                    socket_address,
 129                                    NULL,
 130                                    &cldapsock);
 131         if (!NT_STATUS_IS_OK(status)) {
 132                 DEBUG(0,("Failed to bind to %s - %s\n",
 133                          tsocket_address_string(socket_address, socket_address),
 134                          nt_errstr(status)));
 135                 talloc_free(socket_address);
 136                 return status;
 137         }
 138         talloc_free(socket_address);
 139
 140         cldap_set_incoming_handler(cldapsock, cldapd_request_handler, cldapd);
 141
 142         return NT_STATUS_OK;
 143 }
 144
 145 /*
 146   setup our listening sockets on the configured network interfaces
 147 */
 148 static NTSTATUS cldapd_startup_interfaces(struct cldapd_server *cldapd, struct loadparm_context *lp_ctx,
 149                                           struct interface *ifaces)
 150 {
 151         int num_interfaces;
 152         TALLOC_CTX *tmp_ctx = talloc_new(cldapd);
 153         NTSTATUS status;
 154         int i;
 155
 156         num_interfaces = iface_count(ifaces);
 157
 158         /* if we are allowing incoming packets from any address, then
 159            we need to bind to the wildcard address */
 160         if (!lp_bind_interfaces_only(lp_ctx)) {
 161                 status = cldapd_add_socket(cldapd, lp_ctx, "0.0.0.0");
 162                 NT_STATUS_NOT_OK_RETURN(status);
 163         }
 164
 165         /* now we have to also listen on the specific interfaces,
 166            so that replies always come from the right IP */
 167         for (i=0; i<num_interfaces; i++) {
 168                 const char *address = talloc_strdup(tmp_ctx, iface_n_ip(ifaces, i));
 169                 status = cldapd_add_socket(cldapd, lp_ctx, address);
 170                 NT_STATUS_NOT_OK_RETURN(status);
 171         }
 172
 173         talloc_free(tmp_ctx);
 174
 175         return NT_STATUS_OK;
 176 }
 177
 178 /*
 179   startup the cldapd task
 180 */
 181 static void cldapd_task_init(struct task_server *task)
 182 {
 183         struct cldapd_server *cldapd;
 184         NTSTATUS status;
 185         struct interface *ifaces;
 186
 187         load_interfaces(task, lp_interfaces(task->lp_ctx), &ifaces);
 188
 189         if (iface_count(ifaces) == 0) {
 190                 task_server_terminate(task, "cldapd: no network interfaces configured", false);
 191                 return;
 192         }
 193
 194         switch (lp_server_role(task->lp_ctx)) {
 195         case ROLE_STANDALONE:
 196                 task_server_terminate(task, "cldap_server: no CLDAP server required in standalone configuration",
 197                                       false);
 198                 return;
 199         case ROLE_DOMAIN_MEMBER:
 200                 task_server_terminate(task, "cldap_server: no CLDAP server required in member server configuration",
 201                                       false);
 202                 return;
 203         case ROLE_DOMAIN_CONTROLLER:
 204                 /* Yes, we want an CLDAP server */
 205                 break;
 206         }
 207
 208         task_server_set_title(task, "task[cldapd]");
 209
 210         cldapd = talloc(task, struct cldapd_server);
 211         if (cldapd == NULL) {
 212                 task_server_terminate(task, "cldapd: out of memory", true);
 213                 return;
 214         }
 215
 216         cldapd->task = task;
 217         cldapd->samctx = samdb_connect(cldapd, task->event_ctx, task->lp_ctx, system_session(task->lp_ctx));
 218         if (cldapd->samctx == NULL) {
 219                 task_server_terminate(task, "cldapd failed to open samdb", true);
 220                 return;
 221         }
 222
 223         /* start listening on the configured network interfaces */
 224         status = cldapd_startup_interfaces(cldapd, task->lp_ctx, ifaces);
 225         if (!NT_STATUS_IS_OK(status)) {
 226                 task_server_terminate(task, "cldapd failed to setup interfaces", true);
 227                 return;
 228         }
 229
 230         irpc_add_name(task->msg_ctx, "cldap_server");
 231 }
 232
 233
 234 /*
 235   register ourselves as a available server
 236 */
 237 NTSTATUS server_service_cldapd_init(void)
 238 {
 239         return register_server_service("cldap", cldapd_task_init);
 240 }