mirror of
https://github.com/samba-team/samba.git
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56fc50b0aa
Signed-off-by: Stefan Metzmacher <metze@samba.org> Reviewed-by: Andreas Schneider <asn@samba.org>
267 lines
6.6 KiB
C
267 lines
6.6 KiB
C
/*
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Unix SMB/CIFS implementation.
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Winbind daemon connection manager
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Copyright (C) Tim Potter 2001
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Copyright (C) Andrew Bartlett 2002
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Copyright (C) Gerald Carter 2003
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "libsmb/namequery.h"
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#include "libads/sitename_cache.h"
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#include "ads.h"
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#include "../librpc/gen_ndr/nbt.h"
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#include "lib/param/loadparm.h"
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#include "lib/util/string_wrappers.h"
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/**********************************************************************
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Is this our primary domain ?
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**********************************************************************/
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#ifdef HAVE_ADS
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static bool is_our_primary_domain(const char *domain)
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{
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int role = lp_server_role();
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if ((role == ROLE_DOMAIN_MEMBER) && strequal(lp_workgroup(), domain)) {
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return True;
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} else if (strequal(get_global_sam_name(), domain)) {
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return True;
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}
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return False;
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}
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#endif
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/**************************************************************************
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Find the name and IP address for a server in the realm/domain
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*************************************************************************/
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static bool ads_dc_name(const char *domain,
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const char *realm,
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struct sockaddr_storage *dc_ss,
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fstring srv_name)
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{
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TALLOC_CTX *tmp_ctx = talloc_stackframe();
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bool ok = false;
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ADS_STRUCT *ads;
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const char *sitename;
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int i;
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char addr[INET6_ADDRSTRLEN];
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if (!realm && strequal(domain, lp_workgroup())) {
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realm = lp_realm();
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}
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sitename = sitename_fetch(tmp_ctx, realm);
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/* Try this 3 times then give up. */
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for( i =0 ; i < 3; i++) {
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ads = ads_init(tmp_ctx, realm, domain, NULL, ADS_SASL_PLAIN);
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if (!ads) {
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ok = false;
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goto out;
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}
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DEBUG(4,("ads_dc_name: domain=%s\n", domain));
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#ifdef HAVE_ADS
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/* we don't need to bind, just connect */
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ads_connect_cldap_only(ads);
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#endif
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if (!ads->config.realm) {
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ok = false;
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goto out;
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}
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/* Now we've found a server, see if our sitename
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has changed. If so, we need to re-do the DNS query
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to ensure we only find servers in our site. */
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#ifdef HAVE_ADS
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if (ads_closest_dc(ads)) {
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sitename = ads->config.client_site_name;
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} else
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#endif
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if (stored_sitename_changed(realm, sitename)) {
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sitename = sitename_fetch(tmp_ctx, realm);
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TALLOC_FREE(ads);
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/* Ensure we don't cache the DC we just connected to. */
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namecache_delete(realm, 0x1C);
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namecache_delete(domain, 0x1C);
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continue;
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}
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#ifdef HAVE_ADS
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if (is_our_primary_domain(domain) && (ads->config.flags & NBT_SERVER_KDC)) {
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if (ads_closest_dc(ads)) {
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/* We're going to use this KDC for this realm/domain.
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If we are using sites, then force the krb5 libs
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to use this KDC. */
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create_local_private_krb5_conf_for_domain(realm,
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domain,
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sitename,
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&ads->ldap.ss);
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} else {
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create_local_private_krb5_conf_for_domain(realm,
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domain,
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NULL,
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&ads->ldap.ss);
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}
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}
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#endif
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break;
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}
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if (i == 3) {
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DEBUG(1,("ads_dc_name: sitename (now \"%s\") keeps changing ???\n",
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sitename ? sitename : ""));
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ok = false;
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goto out;
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}
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fstrcpy(srv_name, ads->config.ldap_server_name);
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if (!strupper_m(srv_name)) {
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ok = false;
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goto out;
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}
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#ifdef HAVE_ADS
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*dc_ss = ads->ldap.ss;
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#else
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zero_sockaddr(dc_ss);
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#endif
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print_sockaddr(addr, sizeof(addr), dc_ss);
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DEBUG(4,("ads_dc_name: using server='%s' IP=%s\n",
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srv_name, addr));
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ok = true;
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out:
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TALLOC_FREE(tmp_ctx);
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return ok;
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}
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/****************************************************************************
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Utility function to return the name of a DC. The name is guaranteed to be
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valid since we have already done a name_status_find on it
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***************************************************************************/
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static bool rpc_dc_name(const char *domain,
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fstring srv_name,
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struct sockaddr_storage *ss_out)
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{
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struct samba_sockaddr *sa_list = NULL;
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size_t count = 0;
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struct sockaddr_storage dc_ss;
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size_t i;
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NTSTATUS result;
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char addr[INET6_ADDRSTRLEN];
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/* get a list of all domain controllers */
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result = get_sorted_dc_list(talloc_tos(),
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domain,
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NULL,
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&sa_list,
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&count,
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false);
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if (!NT_STATUS_IS_OK(result)) {
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DEBUG(3, ("Could not look up dc's for domain %s\n", domain));
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return False;
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}
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/* Remove the entry we've already failed with (should be the PDC). */
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for (i = 0; i < count; i++) {
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if (is_zero_addr(&sa_list[i].u.ss))
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continue;
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if (name_status_find(domain, 0x1c, 0x20, &sa_list[i].u.ss, srv_name)) {
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result = check_negative_conn_cache( domain, srv_name );
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if ( NT_STATUS_IS_OK(result) ) {
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dc_ss = sa_list[i].u.ss;
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goto done;
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}
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}
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}
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TALLOC_FREE(sa_list);
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/* No-one to talk to )-: */
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return False; /* Boo-hoo */
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done:
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/* We have the netbios name and IP address of a domain controller.
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Ideally we should sent a SAMLOGON request to determine whether
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the DC is alive and kicking. If we can catch a dead DC before
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performing a cli_connect() we can avoid a 30-second timeout. */
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print_sockaddr(addr, sizeof(addr), &dc_ss);
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DEBUG(3, ("rpc_dc_name: Returning DC %s (%s) for domain %s\n", srv_name,
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addr, domain));
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*ss_out = dc_ss;
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TALLOC_FREE(sa_list);
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return True;
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}
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/**********************************************************************
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wrapper around ads and rpc methods of finds DC's
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**********************************************************************/
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bool get_dc_name(const char *domain,
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const char *realm,
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fstring srv_name,
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struct sockaddr_storage *ss_out)
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{
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struct sockaddr_storage dc_ss;
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bool ret;
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bool our_domain = False;
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zero_sockaddr(&dc_ss);
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ret = False;
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if ( strequal(lp_workgroup(), domain) || strequal(lp_realm(), realm) )
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our_domain = True;
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/* always try to obey what the admin specified in smb.conf
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(for the local domain) */
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if ( (our_domain && lp_security()==SEC_ADS) || realm ) {
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ret = ads_dc_name(domain, realm, &dc_ss, srv_name);
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}
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if (!domain) {
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/* if we have only the realm we can't do anything else */
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return False;
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}
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if (!ret) {
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/* fall back on rpc methods if the ADS methods fail */
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ret = rpc_dc_name(domain, srv_name, &dc_ss);
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}
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*ss_out = dc_ss;
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return ret;
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}
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