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