<?php
/*
	spamd.inc
	part of pfSense (https://www.pfSense.org/)
	Copyright (C) 2008 Scott Ullrich
	Copyright (C) 2015 ESF, LLC
	All rights reserved.

	Redistribution and use in source and binary forms, with or without
	modification, are permitted provided that the following conditions are met:

	1. Redistributions of source code must retain the above copyright notice,
	   this list of conditions and the following disclaimer.

	2. Redistributions in binary form must reproduce the above copyright
	   notice, this list of conditions and the following disclaimer in the
	   documentation and/or other materials provided with the distribution.

	THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
	INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
	AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
	AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
	OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	POSSIBILITY OF SUCH DAMAGE.
*/
if (!function_exists("filter_configure")) {
	require_once("filter.inc");
}

function sync_package_spamd() {
	global $config, $localpath;
	$pf_version = substr(trim(file_get_contents("/etc/version")), 0, 3);
	if ($pf_version != "2.2") {
		$localpath = "/usr/local";
	} else {
		$ARCH = php_uname("m");
		$localpath = "/usr/pbi/spamd-$ARCH/local";
	}

	// write config file
	conf_mount_rw();
	$fd = fopen("/etc/spamd.conf", "w");
	/* all header */
	fwrite($fd, "all:\\\n\t:whitelist:blacklist");
	if ($config['installedpackages']['spamdsources']['config']) {
		foreach ($config['installedpackages']['spamdsources']['config'] as $spamd) {
			if ($spamd['providername']) {
				fwrite($fd, ":" . remove_spaces($spamd['providername']));
			}
		}
	}
	fwrite($fd, ":\n\n");
	fwrite($fd, "whitelist:\\\n");
	fwrite($fd, "\t:method=file:\\\n");
	fwrite($fd, "\t:white:\\\n");
	fwrite($fd, "\t:file=/var/db/whitelist.txt:\n");
	fwrite($fd, "\n");
	fwrite($fd, "blacklist:\\\n");
	fwrite($fd, "\t:black:\\\n");
	fwrite($fd, "\t:msg=\"Sorry, you spammed us before.\":\\\n");
	fwrite($fd, "\t:method=file:\\\n");
	fwrite($fd, "\t:file=/var/db/blacklist.txt:\n\n");
	log_error("[spamd] Looping through each item and write out its configuration");
	/* loop through each item and write out its configuration */
	if ($config['installedpackages']['spamdsources']['config'] != "") {
		foreach ($config['installedpackages']['spamdsources']['config'] as $spamd) {
			if (remove_spaces($spamd['providername'])) {
				if ($spamd['providername']) {
					fwrite($fd, remove_spaces($spamd['providername']) . ":\\\n");
					fwrite($fd, "\t:" . remove_spaces($spamd['providertype']) . ":\\\n");
					fwrite($fd, "\t:msg=\"" . rtrim($spamd['rejectmessage']) . "\":\\\n");
					fwrite($fd, "\t:method=" . remove_spaces($spamd['providermethod']) . ":\\\n");
					$providerurl = $spamd['providerurl'];
					$providerurl = str_replace("http://", "", $providerurl);
					$providerurl = str_replace("https://", "", $providerurl);
					fwrite($fd, "\t:file=" . remove_spaces($providerurl) . ":\n\n");
				}
			}
		}
	}
	fclose($fd);
	log_error("[spamd] Creating /var/db/whitelist.txt");
	$fd = fopen("/var/db/whitelist.txt","w");
	if ($config['installedpackages']['spamdwhitelist']['config'] != "") {
		foreach ($config['installedpackages']['spamdwhitelist']['config'] as $spamd) {
			if ($spamd['ip']) {
				fwrite($fd, $spamd['ip'] . "\n");
			}
		}
	}
	fclose($fd);

	/* if the package is disabled, remove the cronjob, rcfile and do nothing else here ... */
	if (!spamd_enabled()) {
		log_error("[spamd] Removing cron job");
		install_cron_job("/usr/bin/nice -n20 /usr/local/sbin/spamd-setup", false);
		if (is_service_running("spamd")) {
			log_error("[spamd] Stopping and disabling SpamD service");
			stop_service("spamd");
		}
		unlink_if_exists("/usr/local/etc/rc.d/spamd.sh");
		log_error("[spamd] Reconfiguring filter");
		filter_configure();
		log_error("[spamd] Package successfully disabled.");
		return;
	}
	/* ... otherwise, create the rcfile and (re)start spamd */
	$passtime = "5";
	$greyexp = "4";
	$whiteexp = "864";
	$identifier = "";
	$maxcon = "";
	$maxblack = "";
	$stuttersecs = "";
	$delaysecs = "";
	log_error("[spamd] Looping through spamdsettings");
	if ($config['installedpackages']['spamdsettings']['config']) {
		foreach ($config['installedpackages']['spamdsettings']['config'] as $ss) {
			if ($ss['next_mta'] != "") {
				$nextmta = $ss['next_mta'];
			}
			if ($ss['greylistingparms'] != "") {
				$passtime = " -G " . $ss['greylistingparms'];
			}
			if ($ss['identifier'] != "") {
				$identifier = " -n \"" . $ss['identifier'] . "\"";
			}
			// Default is greylisting, turn on blacklisting if not checked.
			if ($ss['greylisting'] != "on") {
				$greylisting = " -b";
				$spamd_setup_opts = "-b";
			}
			if ($ss['maxblack'] != "") {
				$maxblack = " -B " . $ss['maxblack'];
			}
			if ($ss['maxcon'] != "") {
				$maxcon = " -c " . $ss['maxcon'];
			}
			if ($ss['stuttersecs'] != "") {
				$stuttersecs = " -S " . $ss['stuttersecs'];
			}
			if ($ss['delaysecs'] != "") {
				$delaysecs = " -s " . $ss['delaysecs'];
			}
			if ($ss['window'] != "") {
				$window = " -w " . $ss['window'];
			}
			if ($ss['passtime'] != "") {
				$passtime = $ss['passtime'];
			}
			if ($ss['greyexp'] != "") {
				$greyexp = $ss['greyexp'];
			}
			if ($ss['whiteexp'] != "") {
				$whiteexp = $ss['whiteexp'];
			}
		}
	}
	$greyparms = " -G {$passtime}:{$greyexp}:{$whiteexp}";
	$rc = array();
	$rc['file'] = "spamd.sh";
	$rc['start'] = <<< EOF

if [ `/sbin/mount | /usr/bin/grep '[f]descfs' | /usr/bin/wc -l` -lt 1 ]; then
	/sbin/mount -t fdescfs fdescfs /dev/fd
fi
if [ ! -f "/var/db/spamd" ]; then
	/usr/bin/touch /var/db/spamd
fi
/usr/sbin/chown _spamd:proxy /var/db/spamd
/usr/local/sbin/spamd-setup -d -D {$spamd_setup_opts}
{$localpath}/libexec/spamd {$greyparms}{$identifier}{$greylisting}{$maxcon}{$maxblack}{$window}{$replysmtperror} 127.0.0.1 &
{$localpath}/libexec/spamlogd
EOF;

	$rc['stop']  = <<< EOF

/usr/bin/killall spamd-setup 2>/dev/null
/usr/bin/killall spamlogd 2>/dev/null
/usr/bin/killall spamd 2>/dev/null
sleep 3
if [ `/sbin/mount | /usr/bin/grep '[f]descfs' | /usr/bin/wc -l` -gt 0 ]; then
	/sbin/umount /dev/fd
fi
EOF;

	log_error("[spamd] Writing rc_file");
	write_rcfile($rc);

	log_error("[spamd] Installing cron job");
	install_cron_job("/usr/bin/nice -n20 /usr/local/sbin/spamd-setup -d -D {$spamd_setup_opts}", true, "*/120");
	log_error("[spamd] Setting up spamd.conf symlink");
	unlink_if_exists("{$localpath}/etc/spamd/spamd.conf");
	symlink("/etc/spamd.conf", "{$localpath}/etc/spamd/spamd.conf");
	conf_mount_ro();

	log_error("[spamd] (Re)starting spamd");
	if (is_service_running("spamd")) {
		restart_service("spamd");
	} else {
		start_service("spamd");
	}

	log_error("[spamd] Reconfiguring filter");
	filter_configure();
	log_error("[spamd] Package setup completed");
}

function spamd_enabled() {
	global $config, $spamd_enabled;
	$spamd_enabled = false;

	if (is_array($config['installedpackages']['spamdsettings'])) {
		$spamdsettings = $config['installedpackages']['spamdsettings']['config'][0];
	} else {
		$spamdsettings = array();
	}
	if ($spamdsettings['spamd_enable'] == "on") {
		$spamd_enabled = true;
	}

	return $spamd_enabled;
}

function sync_package_spamd_whitelist() {
	global $config;
	conf_mount_rw();
	/* write out ip to the whitelist db */
	$fd = fopen("/var/db/whitelist.txt","w");
	if ($config['installedpackages']['spamdwhitelist']['config'] != "") {
		foreach ($config['installedpackages']['spamdwhitelist']['config'] as $spamd) {
			fwrite($fd, $spamd['ip'] . "\n");
		}
	}
	fclose($fd);
	/* signal a reload of all files */
	mwexec("/usr/bin/killall -HUP spamlogd");
	mwexec("/sbin/pfctl -t spamd-white -T add {$spamd['ip']}");
	conf_mount_ro();
}

function spamd_generate_rules($type) {
	global $config;

	// do not install any rules if disabled
	if (!spamd_enabled()) {
		return;
	}

	$natrules = "";
	switch($type) {
	case 'nat':
		$natrules .= "\n# spam table \n";
		$natrules .= "table <whitelist> persist\n";
		$natrules .= "table <blacklist> persist\n";
		$natrules .= "table <spamd> persist\n";
		if (file_exists("/var/db/whitelist.txt")) {
			$natrules .= "table <spamd-white> persist file \"/var/db/whitelist.txt\"\n";
		}

		if (is_array($config['installedpackages']['spamdsettings']['config'])) {
			$spamdconfig = $config['installedpackages']['spamdsettings']['config']['0'];
		} else {
			$spamdconfig = $config['installedpackages']['spamdsettings']['config'];
		}

		if ($spamdconfig) {
			$nextmta = $spamdconfig['next_mta'];
			$spamdbinds = explode(',', $spamdconfig['spamdbinds_array']);
			if (is_array($spamdbinds)) {
				foreach ($spamdbinds as $interface) {
					$wanif = get_real_interface($interface);
					if (!isset($wanif)) {
						continue;
					}
					$natrules .= "rdr pass on {$wanif} proto tcp from <blacklist> to port smtp -> 127.0.0.1 port spamd\n";
					$natrules .= "rdr pass on {$wanif} proto tcp from <spamd> to port smtp -> 127.0.0.1 port spamd\n";
					$natrules .= "rdr pass on {$wanif} proto tcp from !<spamd-white> to port smtp -> 127.0.0.1 port spamd\n";
					if ($nextmta != "") {
						$natrules .= "rdr pass on {$wanif} proto tcp from <spamd-white> to port smtp -> {$nextmta} port smtp\n";
					}
				}
			}
		}
		$natrules .= "\n";

		break;
	}

	return $natrules;
}

function remove_spaces($string) {
	$string = str_replace(" ", "", $string);
	return $string;
}

function custom_php_install_command() {
	global $config;
	system("touch /var/db/whitelist.txt");
	system("touch /var/db/blacklist.txt");
	exec("/usr/sbin/pw usermod _spamd -g proxy -G _spamd,proxy");
	sync_package_spamd();
}

function custom_php_deinstall_command() {
	global $config;
	unlink_if_exists("/usr/local/pkg/pf/spamd_rules.php");
	install_cron_job("/usr/bin/nice -n20 /usr/local/sbin/spamd-setup", false);
	/* clean up user/groups */
	if (exec("/usr/sbin/pw groupshow proxy | /usr/bin/grep _spamd")) {
		exec ("/usr/sbin/pw groupmod proxy -d _spamd");
	}
	if (exec("/usr/sbin/pw usershow _spamd")) {
		exec("/usr/sbin/pw userdel _spamd");
	}
	if (exec("/usr/sbin/pw groupshow _spamd")) {
		exec("/usr/sbin/pw groupdel _spamd");
	}
	/* unmount fdescfs if needed */
	if (trim(shell_exec("/sbin/mount | /usr/bin/grep '[f]descfs' | /usr/bin/wc -l")) != 0) {
		log_error("[spamd] Unmounting fdescfs.");
		mwexec("/sbin/umount /dev/fd");
	}
	unlink_if_exists("/var/db/spamd");
	filter_configure();
}

function spamd_validate_input($post, &$input_errors) {
	if (!empty($post["next_mta"])) {
		if (!is_ipaddrv4($post['next_mta'])) {
			$input_errors[] = "'NextMTA' is not a valid IPv4 address";
		}
	}

	if (isset($post['maxblack']) && $post['maxblack'] != "") {
		if (!is_numericint($post['maxblack']) || $post['maxblack'] < 1) {
			$input_errors[] = "'Maximum Blacklisted Connections' must be a positive integer or empty.";
		}
	}

	if (isset($post['maxcon']) && $post['maxcon'] != "") {
		if (!is_numericint($post['maxcon']) || $post['maxcon'] < 1) {
			$input_errors[] = "'Max Concurrent Connections' must be a positive integer or empty.";
		}
	}

	if (!empty($post['maxblack']) && is_numericint($post['maxblack']) && !empty($post['maxcon']) && is_numericint($post['maxcon'])) {
		if ($post['maxblack'] >  $post['maxcon']) {
			$input_errors[] = "'Maximum Blacklisted Connections' must not be higher than 'Max Concurrent Connections'.";
		}
	}

	if (isset($post['passtime']) && $post['passtime'] != "") {
		if (!is_numericint($post['passtime']) || $post['passtime'] < 1) {
			$input_errors[] = "'Passtime' must be a positive integer or empty.";
		}
	}

	if (isset($post['greyexp']) && $post['greyexp'] != "") {
		if (!is_numericint($post['greyexp']) || $post['greyexp'] < 1) {
			$input_errors[] = "'Grey Expiration' must be a positive integer or empty.";
		}
	}

	if (isset($post['whiteexp']) && $post['whiteexp'] != "") {
		if (!is_numericint($post['whiteexp']) || $post['whiteexp'] < 1) {
			$input_errors[] = "'White Exp' must be a positive integer or empty.";
		}
	}

	if (isset($post['stuttersecs']) && $post['stuttersecs'] != "") {
		if (!is_numericint($post['stuttersecs']) || $post['stuttersecs'] < 1) {
			$input_errors[] = "'Stutter Secs' must be a positive integer or empty.";
		}
	}

	if (isset($post['delaysecs']) && $post['delaysecs'] != "") {
		if (!is_numericint($post['delaysecs']) || $post['delaysecs'] < 1) {
			$input_errors[] = "'Delay Secs' must be a positive integer or empty.";
		}
	}

	if (isset($post['window']) && $post['window'] != "") {
		if (!is_numericint($post['window']) || $post['window'] < 1) {
			$input_errors[] = "'Window Size' must be a positive integer or empty.";
		}
	}
}

?>