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/*
Unix SMB/CIFS implementation.
Winbind daemon connection manager
Copyright (C) Tim Potter 2001
Copyright (C) Andrew Bartlett 2002
Copyright (C) Gerald Carter 2003
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "libads/sitename_cache.h"
#include "ads.h"
/**********************************************************************
Is this our primary domain ?
**********************************************************************/
#ifdef HAVE_KRB5
static bool is_our_primary_domain(const char *domain)
{
int role = lp_server_role();
if ((role == ROLE_DOMAIN_MEMBER) && strequal(lp_workgroup(), domain)) {
return True;
} else if (strequal(get_global_sam_name(), domain)) {
return True;
}
return False;
}
#endif
/**************************************************************************
Find the name and IP address for a server in the realm/domain
*************************************************************************/
static bool ads_dc_name(const char *domain,
const char *realm,
struct sockaddr_storage *dc_ss,
fstring srv_name)
{
ADS_STRUCT *ads;
char *sitename;
int i;
char addr[INET6_ADDRSTRLEN];
if (!realm && strequal(domain, lp_workgroup())) {
realm = lp_realm();
}
sitename = sitename_fetch(realm);
/* Try this 3 times then give up. */
for( i =0 ; i < 3; i++) {
ads = ads_init(realm, domain, NULL);
if (!ads) {
SAFE_FREE(sitename);
return False;
}
DEBUG(4,("ads_dc_name: domain=%s\n", domain));
#ifdef HAVE_ADS
/* we don't need to bind, just connect */
ads->auth.flags |= ADS_AUTH_NO_BIND;
ads_connect(ads);
#endif
if (!ads->config.realm) {
SAFE_FREE(sitename);
ads_destroy(&ads);
return False;
}
/* Now we've found a server, see if our sitename
has changed. If so, we need to re-do the DNS query
to ensure we only find servers in our site. */
if (stored_sitename_changed(realm, sitename)) {
SAFE_FREE(sitename);
sitename = sitename_fetch(realm);
ads_destroy(&ads);
/* Ensure we don't cache the DC we just connected to. */
namecache_delete(realm, 0x1C);
namecache_delete(domain, 0x1C);
continue;
}
#ifdef HAVE_KRB5
if (is_our_primary_domain(domain) && (ads->config.flags & NBT_SERVER_KDC)) {
if (ads_closest_dc(ads)) {
/* We're going to use this KDC for this realm/domain.
If we are using sites, then force the krb5 libs
to use this KDC. */
create_local_private_krb5_conf_for_domain(realm,
domain,
sitename,
&ads->ldap.ss,
ads->config.ldap_server_name);
} else {
create_local_private_krb5_conf_for_domain(realm,
domain,
NULL,
&ads->ldap.ss,
ads->config.ldap_server_name);
}
}
#endif
break;
}
if (i == 3) {
DEBUG(1,("ads_dc_name: sitename (now \"%s\") keeps changing ???\n",
sitename ? sitename : ""));
SAFE_FREE(sitename);
return False;
}
SAFE_FREE(sitename);
fstrcpy(srv_name, ads->config.ldap_server_name);
strupper_m(srv_name);
#ifdef HAVE_ADS
*dc_ss = ads->ldap.ss;
#else
zero_sockaddr(dc_ss);
#endif
ads_destroy(&ads);
print_sockaddr(addr, sizeof(addr), dc_ss);
DEBUG(4,("ads_dc_name: using server='%s' IP=%s\n",
srv_name, addr));
return True;
}
/****************************************************************************
Utility function to return the name of a DC. The name is guaranteed to be
valid since we have already done a name_status_find on it
***************************************************************************/
static bool rpc_dc_name(const char *domain,
fstring srv_name,
struct sockaddr_storage *ss_out)
{
struct ip_service *ip_list = NULL;
struct sockaddr_storage dc_ss;
int count, i;
NTSTATUS result;
char addr[INET6_ADDRSTRLEN];
/* get a list of all domain controllers */
if (!NT_STATUS_IS_OK(get_sorted_dc_list(domain, NULL, &ip_list, &count,
False))) {
DEBUG(3, ("Could not look up dc's for domain %s\n", domain));
return False;
}
/* Remove the entry we've already failed with (should be the PDC). */
for (i = 0; i < count; i++) {
if (is_zero_addr((struct sockaddr *)&ip_list[i].ss))
continue;
if (name_status_find(domain, 0x1c, 0x20, &ip_list[i].ss, srv_name)) {
result = check_negative_conn_cache( domain, srv_name );
if ( NT_STATUS_IS_OK(result) ) {
dc_ss = ip_list[i].ss;
goto done;
}
}
}
SAFE_FREE(ip_list);
/* No-one to talk to )-: */
return False; /* Boo-hoo */
done:
/* We have the netbios name and IP address of a domain controller.
Ideally we should sent a SAMLOGON request to determine whether
the DC is alive and kicking. If we can catch a dead DC before
performing a cli_connect() we can avoid a 30-second timeout. */
print_sockaddr(addr, sizeof(addr), &dc_ss);
DEBUG(3, ("rpc_dc_name: Returning DC %s (%s) for domain %s\n", srv_name,
addr, domain));
*ss_out = dc_ss;
SAFE_FREE(ip_list);
return True;
}
/**********************************************************************
wrapper around ads and rpc methods of finds DC's
**********************************************************************/
bool get_dc_name(const char *domain,
const char *realm,
fstring srv_name,
struct sockaddr_storage *ss_out)
{
struct sockaddr_storage dc_ss;
bool ret;
bool our_domain = False;
zero_sockaddr(&dc_ss);
ret = False;
if ( strequal(lp_workgroup(), domain) || strequal(lp_realm(), realm) )
our_domain = True;
/* always try to obey what the admin specified in smb.conf
(for the local domain) */
if ( (our_domain && lp_security()==SEC_ADS) || realm ) {
ret = ads_dc_name(domain, realm, &dc_ss, srv_name);
}
if (!domain) {
/* if we have only the realm we can't do anything else */
return False;
}
if (!ret) {
/* fall back on rpc methods if the ADS methods fail */
ret = rpc_dc_name(domain, srv_name, &dc_ss);
}
*ss_out = dc_ss;
return ret;
}
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