From 8daa83a594a2e98f39d764422bfbdbc62c9efd44 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 19:20:00 +0200 Subject: Adding upstream version 2:4.20.0+dfsg. Signed-off-by: Daniel Baumann --- source3/libsmb/namequery_dc.c | 262 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 262 insertions(+) create mode 100644 source3/libsmb/namequery_dc.c (limited to 'source3/libsmb/namequery_dc.c') diff --git a/source3/libsmb/namequery_dc.c b/source3/libsmb/namequery_dc.c new file mode 100644 index 0000000..06e2c50 --- /dev/null +++ b/source3/libsmb/namequery_dc.c @@ -0,0 +1,262 @@ +/* + 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 . +*/ + + +#include "includes.h" +#include "libsmb/namequery.h" +#include "libads/sitename_cache.h" +#include "ads.h" +#include "../librpc/gen_ndr/nbt.h" +#include "lib/param/loadparm.h" +#include "lib/util/string_wrappers.h" + +/********************************************************************** + Is this our primary domain ? +**********************************************************************/ + +#ifdef HAVE_ADS +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) +{ + TALLOC_CTX *tmp_ctx = talloc_stackframe(); + bool ok = false; + ADS_STRUCT *ads; + char *sitename; + int i; + char addr[INET6_ADDRSTRLEN]; + + if (!realm && strequal(domain, lp_workgroup())) { + realm = lp_realm(); + } + + sitename = sitename_fetch(tmp_ctx, realm); + + /* Try this 3 times then give up. */ + for( i =0 ; i < 3; i++) { + ads = ads_init(tmp_ctx, realm, domain, NULL, ADS_SASL_PLAIN); + if (!ads) { + ok = false; + goto out; + } + + 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) { + ok = false; + goto out; + } + + /* 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)) { + sitename = sitename_fetch(tmp_ctx, realm); + TALLOC_FREE(ads); + /* Ensure we don't cache the DC we just connected to. */ + namecache_delete(realm, 0x1C); + namecache_delete(domain, 0x1C); + continue; + } + +#ifdef HAVE_ADS + 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); + } else { + create_local_private_krb5_conf_for_domain(realm, + domain, + NULL, + &ads->ldap.ss); + } + } +#endif + break; + } + + if (i == 3) { + DEBUG(1,("ads_dc_name: sitename (now \"%s\") keeps changing ???\n", + sitename ? sitename : "")); + ok = false; + goto out; + } + + fstrcpy(srv_name, ads->config.ldap_server_name); + if (!strupper_m(srv_name)) { + ok = false; + goto out; + } +#ifdef HAVE_ADS + *dc_ss = ads->ldap.ss; +#else + zero_sockaddr(dc_ss); +#endif + print_sockaddr(addr, sizeof(addr), dc_ss); + DEBUG(4,("ads_dc_name: using server='%s' IP=%s\n", + srv_name, addr)); + + ok = true; +out: + TALLOC_FREE(tmp_ctx); + + return ok; +} + +/**************************************************************************** + 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 samba_sockaddr *sa_list = NULL; + size_t count = 0; + struct sockaddr_storage dc_ss; + size_t i; + NTSTATUS result; + char addr[INET6_ADDRSTRLEN]; + + /* get a list of all domain controllers */ + + result = get_sorted_dc_list(talloc_tos(), + domain, + NULL, + &sa_list, + &count, + false); + if (!NT_STATUS_IS_OK(result)) { + 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(&sa_list[i].u.ss)) + continue; + + if (name_status_find(domain, 0x1c, 0x20, &sa_list[i].u.ss, srv_name)) { + result = check_negative_conn_cache( domain, srv_name ); + if ( NT_STATUS_IS_OK(result) ) { + dc_ss = sa_list[i].u.ss; + goto done; + } + } + } + + TALLOC_FREE(sa_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; + TALLOC_FREE(sa_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; +} -- cgit v1.2.3