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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 1999, 2001, 2002, 2003, 2004,
2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
GNU Mailutils 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, or (at your option)
any later version.
GNU Mailutils 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 GNU Mailutils; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301 USA */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdlib.h>
#include <syslog.h>
#include <string.h>
#include <mailutils/debug.h>
#include <mailutils/nls.h>
#include <mailutils/syslog.h>
#include <mailutils/cfg.h>
#include <mailutils/diag.h>
#include <mailutils/error.h>
int mu_tcp_wrapper_enable = 1;
char *mu_tcp_wrapper_daemon;
#ifdef WITH_LIBWRAP
# include <tcpd.h>
int deny_severity = LOG_INFO;
int allow_severity = LOG_INFO;
int
mu_tcp_wrapper_cb_hosts_allow_syslog (mu_debug_t debug, void *data,
mu_config_value_t *val)
{
if (mu_cfg_assert_value_type (val, MU_CFG_STRING, debug))
return 1;
if (mu_string_to_syslog_priority (val->v.string, &allow_severity))
mu_cfg_format_error (debug, MU_DEBUG_ERROR,
_("unknown syslog priority `%s'"),
val->v.string);
return 0;
}
int
mu_tcp_wrapper_cb_hosts_deny_syslog (mu_debug_t debug, void *data,
mu_config_value_t *val)
{
if (mu_cfg_assert_value_type (val, MU_CFG_STRING, debug))
return 1;
if (mu_string_to_syslog_priority (val->v.string, &deny_severity))
mu_cfg_format_error (debug, MU_DEBUG_ERROR,
_("unknown syslog priority `%s'"),
val->v.string);
return 0;
}
int
mu_tcpwrapper_access (int fd)
{
struct request_info req;
if (!mu_tcp_wrapper_enable)
return 1;
request_init (&req,
RQ_DAEMON,
mu_tcp_wrapper_daemon ?
mu_tcp_wrapper_daemon : mu_program_name,
RQ_FILE, fd, NULL);
fromhost (&req);
return hosts_access (&req);
}
struct mu_cfg_param tcpwrapper_param[] = {
{ "enable", mu_cfg_bool, &mu_tcp_wrapper_enable, 0, NULL,
N_("Enable TCP wrapper access control. Default is \"yes\".") },
{ "daemon", mu_cfg_string, &mu_tcp_wrapper_daemon, 0, NULL,
N_("Set daemon name for TCP wrapper lookups. Default is program name."),
N_("name") },
{ "allow-table", mu_cfg_string, &hosts_allow_table,
0, NULL,
N_("Use file for positive client address access control "
"(default: /etc/hosts.allow)."),
N_("file") },
{ "deny-table", mu_cfg_string, &hosts_deny_table,
0, NULL,
N_("Use file for negative client address access control "
"(default: /etc/hosts.deny)."),
N_("file") },
{ "allow-syslog-priority", mu_cfg_callback, NULL, 0,
mu_tcp_wrapper_cb_hosts_allow_syslog,
N_("Log host allows at this syslog priority."),
N_("level") },
{ "deny-syslog-priority", mu_cfg_callback, NULL, 0,
mu_tcp_wrapper_cb_hosts_deny_syslog,
N_("Log host denies at this syslog priority."),
N_("level") },
{ NULL }
};
void
mu_tcpwrapper_cfg_init ()
{
struct mu_cfg_section *section;
mu_create_canned_section ("tcp-wrappers", §ion);
mu_cfg_section_add_params (section, tcpwrapper_param);
}
#else
void
mu_tcpwrapper_cfg_init ()
{
}
int
mu_tcpwrapper_access (int fd)
{
return 1;
}
#endif
int
mu_tcp_wrapper_prefork (int fd, void *data, struct sockaddr *sa, int salen)
{
if (mu_tcp_wrapper_enable
&& sa->sa_family == AF_INET
&& !mu_tcpwrapper_access (fd))
{
char *p = mu_sockaddr_to_astr (sa, salen);
mu_error (_("access from %s blocked by TCP wrappers"), p);
free (p);
return 1;
}
return 0;
}
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