ip cloaking

inc/bans.php

@@ -142,6 +142,7 @@ class Bans {
 				if ($ban['post'])
 					$ban['post'] = json_decode($ban['post'], true);
 				$ban['mask'] = self::range_to_string(array($ban['ipstart'], $ban['ipend']));
+				$ban['cmask'] = cloak_mask($ban['mask']);
 				$ban_list[] = $ban;
 			}
 		}
@@ -162,7 +163,8 @@ class Bans {
 		$end = end($bans);
 
 		foreach ($bans as &$ban) {
-                        $ban['mask'] = self::range_to_string(array($ban['ipstart'], $ban['ipend']));
+			$uncloaked_mask = self::range_to_string(array($ban['ipstart'], $ban['ipend']));
+			$ban['mask'] = cloak_mask($uncloaked_mask);
 
 			if ($ban['post']) {
 				$post = json_decode($ban['post']);
@@ -174,7 +176,7 @@ class Bans {
 				$ban['access'] = true;
 			}
 
-			if (filter_var($ban['mask'], FILTER_VALIDATE_IP) !== false) {
+			if (filter_var($uncloaked_mask, FILTER_VALIDATE_IP) !== false) {
 				$ban['single_addr'] = true;
 			}
 			if ($filter_staff || ($board_access !== false && !in_array($ban['board'], $board_access))) {
@@ -230,9 +232,10 @@ class Bans {
 		                error($config['error']['noaccess']);
 			
 			$mask = self::range_to_string(array($ban['ipstart'], $ban['ipend']));
+			$cloaked_mask = cloak_mask($mask);
 			
 			modLog("Removed ban #{$ban_id} for " .
-				(filter_var($mask, FILTER_VALIDATE_IP) !== false ? "<a href=\"?/IP/$mask\">$mask</a>" : $mask));
+				(filter_var($mask, FILTER_VALIDATE_IP) !== false ? "<a href=\"?/IP/$cloaked_mask\">$cloaked_mask</a>" : $cloaked_mask));
 		}
 		
 		query("DELETE FROM ``bans`` WHERE `id` = " . (int)$ban_id) or error(db_error());
@@ -242,7 +245,9 @@ class Bans {
 		return true;
 	}
 	
-	static public function new_ban($mask, $reason, $length = false, $ban_board = false, $mod_id = false, $post = false) {
+	static public function new_ban($cloaked_mask, $reason, $length = false, $ban_board = false, $mod_id = false, $post = false) {
+		$mask = uncloak_mask($cloaked_mask);
+
 		global $mod, $pdo, $board;
 		
 		if ($mod_id === false) {
@@ -251,6 +256,7 @@ class Bans {
 				
 		$range = self::parse_range($mask);
 		$mask = self::range_to_string($range);
+		$cloaked_mask = cloak_mask($mask);
 		
 		$query = prepare("INSERT INTO ``bans`` VALUES (NULL, :ipstart, :ipend, :time, :expires, :board, :mod, :reason, 0, :post)");
 		
@@ -293,14 +299,13 @@ class Bans {
 			$query->bindValue(':post', null, PDO::PARAM_NULL);
 		
 		$query->execute() or error(db_error($query));
-		
 		if (isset($mod['id']) && $mod['id'] == $mod_id) {
 			modLog('Created a new ' .
 				($length > 0 ? preg_replace('/^(\d+) (\w+?)s?$/', '$1-$2', until($length)) : 'permanent') .
 				' ban on ' .
 				($ban_board ? '/' . $ban_board . '/' : 'all boards') .
 				' for ' .
-				(filter_var($mask, FILTER_VALIDATE_IP) !== false ? "<a href=\"?/IP/$mask\">$mask</a>" : $mask) .
+				(filter_var($mask, FILTER_VALIDATE_IP) !== false ? "<a href=\"?/IP/$cloaked_mask\">$cloaked_mask</a>" : $cloaked_mask) .
 				' (<small>#' . $pdo->lastInsertId() . '</small>)' .
 				' with ' . ($reason ? 'reason: ' . utf8tohtml($reason) . '' : 'no reason'));
 		}

inc/config.php

@@ -1874,3 +1874,13 @@
 
 	// Allowed HTML tags in ?/edit_pages.
 	$config['allowed_html'] = 'a[href|title],p,br,li,ol,ul,strong,em,u,h2,b,i,tt,div,img[src|alt|title],hr';
+
+	// Secret passphrase for IP cloaking
+	// Disabled if empty.
+	$config['ipcrypt_key'] = '';
+
+	// IP cloak prefix
+	$config['ipcrypt_prefix'] = 'Cloak';
+
+	// Whether to append domain names to IP cloaks
+	$config['ipcrypt_dns'] = false;

inc/functions.php

@@ -2860,3 +2860,118 @@ function strategy_first($fun, $array) {
 		return array('defer');
 	}
 }
+
+function base32_decode($d) {
+	$charset = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567';
+	$d = str_split($d);
+	$l = array_pop($d);
+	$b = '';
+	foreach ($d as $c) {
+		$b .= sprintf("%05b", strpos($charset, $c));
+	}
+	$padding = 8 - strlen($b) % 8;
+	$b .= str_pad(decbin(strpos($charset, $l)), $padding, '0', STR_PAD_LEFT);
+
+	return implode('', array_map(function($c) { return chr(bindec($c)); }, str_split($b, 8)));
+}
+
+function base32_encode($d) {
+	$charset = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567';
+	$b = implode('', array_map(function($c) { return sprintf("%08b", ord($c)); }, str_split($d)));
+	return implode('', array_map(function($c) use ($charset) { return $charset[bindec($c)]; }, str_split($b, 5)));
+}
+
+function cloak_ip($ip) {
+	global $config;
+	$ipcrypt_key = $config['ipcrypt_key'] ?: null;
+
+	if (empty($ipcrypt_key))
+		return $ip;
+
+	$ip_dec = inet_pton($ip);
+
+	if ($config['ipcrypt_dns']) {
+		$host = gethostbyaddr($ip);
+
+		if ($host !== $ip) {
+			$segments = explode('.', $host);
+
+			$tld = [];
+			$tld[] = array_pop($segments);
+			if (count($segments) >= 2) {
+				$tld[] = array_pop($segments);
+			}
+
+			$tld = implode('.', array_reverse($tld));
+		}
+	}
+
+	if (is_numeric($ip))
+		$ipbytes = pack('N', $ip);
+	else if ($ip_dec !== false)
+		$ipbytes = $ip_dec;
+	else
+		return "#ERROR";
+
+	if (strlen($ipbytes) >= 16)
+		$ipbytes = substr($ipbytes, 0, 16);
+
+	$cyphertext = openssl_encrypt($ipbytes, 'rc4-40', $ipcrypt_key, OPENSSL_RAW_DATA);
+
+	$ret = $config['ipcrypt_prefix'].':' . base32_encode($cyphertext);
+	if (isset($tld) && !empty($tld)) {
+		$ret .= '.'.$tld;
+	}
+
+	return $ret;
+}
+
+function uncloak_ip($ip) {
+	global $config;
+	$ipcrypt_key = ($config['ipcrypt_key']);
+
+	if (empty($ipcrypt_key))
+		return $ip;
+
+	$juice = substr($ip, strlen($config['ipcrypt_prefix']) + 1);
+	if ($delimiter = strpos($juice, '.')) {
+		$juice = substr($juice, 0, $delimiter);
+	}
+
+	if (substr($ip, 0, strlen($config['ipcrypt_prefix']) + 1) === $config['ipcrypt_prefix'].':') {
+		$plaintext = openssl_decrypt(base32_decode($juice), 'rc4-40', $ipcrypt_key, OPENSSL_RAW_DATA);
+
+		if ($plaintext === false || strlen($plaintext) == 0)
+			return '#ERROR';
+
+		if (strlen($ip) >= 16)
+			return inet_ntop($plaintext);
+		else
+			return long2ip(unpack('N', $plaintext)[1]);
+	}
+
+	return '#ERROR';
+}
+
+function cloak_mask($mask) {
+	list($net, $block) = explode('/', $mask, 2);
+	$mask = cloak_ip($net);
+	if ($block) {
+		$mask .= '/'.$block;
+	}
+
+	return $mask;
+}
+
+function uncloak_mask($mask) {
+	list($addr, $block) = explode('/', $mask, 2);
+	$mask = uncloak_ip($addr);
+	if ($mask === '#ERROR') {
+		$mask = $addr;
+	}
+	if ($block) {
+		$mask .= '/'.$block;
+	}
+
+	return $mask;
+}

inc/lib/Twig/Extensions/Extension/Tinyboard.php

@@ -28,6 +28,8 @@ class Twig_Extensions_Extension_Tinyboard extends Twig_Extension
 			new Twig_SimpleFilter('push', 'twig_push_filter'),
 			new Twig_SimpleFilter('bidi_cleanup', 'bidi_cleanup'),
 			new Twig_SimpleFilter('addslashes', 'addslashes'),
+			new Twig_SimpleFilter('cloak_ip', 'cloak_ip'),
+			new Twig_SimpleFilter('cloak_mask', 'cloak_mask'),
 		);
 	}
 	

inc/mod/pages.php

@@ -773,7 +773,8 @@ function mod_view_thread50($boardName, $thread) {
 	echo $page;
 }
 
-function mod_ip_remove_note($ip, $id) {
+function mod_ip_remove_note($cloaked_ip, $id) {
+	$ip = uncloak_ip($cloaked_ip);
 	global $config, $mod;
 	
 	if (!hasPermission($config['mod']['remove_notes']))
@@ -787,12 +788,13 @@ function mod_ip_remove_note($ip, $id) {
 	$query->bindValue(':id', $id);
 	$query->execute() or error(db_error($query));
 
-	modLog("Removed a note for <a href=\"?/IP/{$ip}\">{$ip}</a>");
+	modLog("Removed a note for <a href=\"?/IP/{$cloaked_ip}\">{$cloaked_ip}</a>");
 	
-	header('Location: ?/IP/' . $ip . '#notes', true, $config['redirect_http']);
+	header('Location: ?/IP/' . $cloaked_ip . '#notes', true, $config['redirect_http']);
 }
 
-function mod_page_ip($ip) {
+function mod_page_ip($cip) {
+	$ip = uncloak_ip($cip);
 	global $config, $mod;
 	
 	if (filter_var($ip, FILTER_VALIDATE_IP) === false)
@@ -804,7 +806,7 @@ function mod_page_ip($ip) {
 		
 		Bans::delete($_POST['ban_id'], true, $mod['boards']);
 		
-		header('Location: ?/IP/' . $ip . '#bans', true, $config['redirect_http']);
+		header('Location: ?/IP/' . $cip . '#bans', true, $config['redirect_http']);
 		return;
 	}
 	
@@ -821,9 +823,9 @@ function mod_page_ip($ip) {
 		$query->bindValue(':body', $_POST['note']);
 		$query->execute() or error(db_error($query));
 		
-		modLog("Added a note for <a href=\"?/IP/{$ip}\">{$ip}</a>");
+		modLog("Added a note for <a href=\"?/IP/{$cip}\">{$cip}</a>");
 		
-		header('Location: ?/IP/' . $ip . '#notes', true, $config['redirect_http']);
+		header('Location: ?/IP/' . $cip . '#notes', true, $config['redirect_http']);
 		return;
 	}
 	
@@ -831,7 +833,7 @@ function mod_page_ip($ip) {
 	$args['ip'] = $ip;
 	$args['posts'] = array();
 	
-	if ($config['mod']['dns_lookup'])
+	if ($config['mod']['dns_lookup'] && empty($config['ipcrypt_key']))
 		$args['hostname'] = rDNS($ip);
 	
 	$boards = listBoards();
@@ -873,16 +875,16 @@ function mod_page_ip($ip) {
 	
 	if (hasPermission($config['mod']['modlog_ip'])) {
 		$query = prepare("SELECT `username`, `mod`, `ip`, `board`, `time`, `text` FROM ``modlogs`` LEFT JOIN ``mods`` ON `mod` = ``mods``.`id` WHERE `text` LIKE :search ORDER BY `time` DESC LIMIT 50");
-		$query->bindValue(':search', '%' . $ip . '%');
+		$query->bindValue(':search', '%' . $cip . '%');
 		$query->execute() or error(db_error($query));
 		$args['logs'] = $query->fetchAll(PDO::FETCH_ASSOC);
 	} else {
 		$args['logs'] = array();
 	}
 	
-	$args['security_token'] = make_secure_link_token('IP/' . $ip);
+	$args['security_token'] = make_secure_link_token('IP/' . $cip);
 	
-	mod_page(sprintf('%s: %s', _('IP'), htmlspecialchars($ip)), 'mod/view_ip.html', $args, $args['hostname']);
+	mod_page(sprintf('%s: %s', _('IP'), htmlspecialchars($cip)), 'mod/view_ip.html', $args, $args['hostname'] ?? null);
 }
 
 function mod_ban() {
@@ -974,7 +976,7 @@ function mod_ban_appeals() {
 			error(_('Ban appeal not found!'));
 		}
 		
-		$ban['mask'] = Bans::range_to_string(array($ban['ipstart'], $ban['ipend']));
+		$ban['mask'] = cloak_mask(Bans::range_to_string(array($ban['ipstart'], $ban['ipend'])));
 		
 		if (isset($_POST['unban'])) {
 			modLog('Accepted ban appeal #' . $ban['id'] . ' for ' . $ban['mask']);
@@ -1751,7 +1753,8 @@ function mod_deletebyip($boardName, $post, $global = false) {
 	}
 	
 	// Record the action
-	modLog("Deleted all posts by IP address: <a href=\"?/IP/$ip\">$ip</a>");
+	$cip = cloak_ip($ip);
+	modLog("Deleted all posts by IP address: <a href=\"?/IP/$cip\">$cip</a>");
 	
 	// Redirect
 	header('Location: ?/' . sprintf($config['board_path'], $boardName) . $config['file_index'], true, $config['redirect_http']);
@@ -2210,7 +2213,7 @@ function mod_reports() {
 	$reports = $query->fetchAll(PDO::FETCH_ASSOC);
 	
 	$report_queries = array();
-	foreach ($reports as $report) {
+	foreach ($reports as &$report) {
 		if (!isset($report_queries[$report['board']]))
 			$report_queries[$report['board']] = array();
 		$report_queries[$report['board']][] = $report['post'];
@@ -2308,9 +2311,9 @@ function mod_report_dismiss($id, $all = false) {
 	}
 	$query->execute() or error(db_error($query));
 	
-	
+	$cip = cloak_ip($ip);
 	if ($all)
-		modLog("Dismissed all reports by <a href=\"?/IP/$ip\">$ip</a>");
+		modLog("Dismissed all reports by <a href=\"?/IP/$cip\">$cip</a>");
 	else
 		modLog("Dismissed a report for post #{$id}", $board);
 	

templates/mod/ban_appeals.html

@@ -16,7 +16,7 @@
 		{% if mod|hasPermission(config.mod.show_ip, board.uri) %}
 			<tr>
 				<th>{% trans 'IP' %}</th>
-				<td>{{ ban.mask }}</td>
+				<td>{{ ban.mask|cloak_mask }}</td>
 			</tr>
 		{% endif %}
 		<tr>

templates/mod/ban_form.html

@@ -21,7 +21,7 @@
 			</th>
 			<td>
 				{% if not hide_ip %}
-					<input type="text" name="ip" id="ip" size="30" maxlength="40" value="{{ ip|e }}">
+					<input type="text" name="ip" id="ip" size="30" maxlength="40" value="{{ ip|cloak_ip|e }}">
 				{% else %}
 					<em>{% trans 'hidden' %}</em>
 				{% endif %}

templates/mod/log.html

@@ -27,7 +27,7 @@
 			</td>
 			<td class="minimal">
 				{% if mod|hasPermission(config.mod.show_ip_modlog) %}
-					<a href="?/IP/{{ log.ip }}">{{ log.ip }}</a>
+					<a href="?/IP/{{ log.ip|cloak_ip }}">{{ log.ip|cloak_ip }}</a>
 				{% else %}
 					<em>hidden</em>
 				{% endif %}

templates/mod/report.html

@@ -7,7 +7,7 @@
 	{% trans 'Report date' %}: {{ report.time|date(config.post_date) }}
 	<br>
 	{% if mod|hasPermission(config.mod.show_ip, report.board) %}
-		{% trans 'Reported by' %}: <a href="?/IP/{{ report.ip }}">{{ report.ip }}</a>
+		{% trans 'Reported by' %}: <a href="?/IP/{{ report.ip|cloak_ip }}">{{ report.ip|cloak_ip }}</a>
 		<br>
 	{% endif %}
 	{% if mod|hasPermission(config.mod.report_dismiss, report.board) or mod|hasPermission(config.mod.report_dismiss_ip, report.board) %}

templates/mod/search_results.html

@@ -21,7 +21,7 @@
 		{% for note in results %}
 			<tr>
 				<td class="minimal">
-					<a href="?/IP/{{ note.ip }}#notes">{{ note.ip }}</a>
+					<a href="?/IP/{{ note.ip|cloak_ip }}#notes">{{ note.ip|cloak_ip }}</a>
 				</td>
 				<td class="minimal">
 					{% if note.username %}
@@ -57,9 +57,9 @@
 			<tr{% if ban.expires != 0 and ban.expires < time() %} style="text-decoration:line-through"{% endif %}>
 				<td style="white-space: nowrap">
 					{% if ban.single_addr %}
-						<a href="?/IP/{{ ban.mask }}#bans">{{ ban.mask }}</a>
+						<a href="?/IP/{{ ban.mask|cloak_mask }}#bans">{{ ban.mask|cloak_mask }}</a>
 					{% else %}
-						{{ ban.mask|e }}
+						{{ ban.mask|cloak_mask|e }}
 					{% endif %}
 				</td>
 				<td>
@@ -148,7 +148,7 @@
 					{% endif %}
 				</td>
 				<td class="minimal">
-					<a href="?/IP/{{ log.ip }}">{{ log.ip }}</a>
+					<a href="?/IP/{{ log.ip|cloak_ip }}">{{ log.ip|cloak_ip }}</a>
 				</td>
 				<td class="minimal">
 					<span title="{{ log.time|date(config.post_date) }}">{{ log.time|ago }}</span>
@@ -210,8 +210,8 @@
 				</td>
 				<td class="minimal">
 					{% if mod|hasPermission(config.mod.show_ip, post.board) %}
-						<a href="?/IP/{{ post.ip }}">
+						<a href="?/IP/{{ post.ip|cloak_ip }}">
-							{{ post.ip }}
+							{{ post.ip|cloak_ip }}
 						</a>
 					{% else %}
 						<em>hidden</em>

templates/mod/user.html

@@ -98,7 +98,7 @@
 		{% for log in logs %}
 			<tr>
 				<td class="minimal">
-					<a href="?/IP/{{ log.ip }}">{{ log.ip }}</a>
+					<a href="?/IP/{{ log.ip|cloak_ip }}">{{ log.ip|cloak_ip }}</a>
 				</td>
 				<td class="minimal">
 					<span title="{{ log.time|date(config.post_date) }}">{{ log.time|ago }}</span>

templates/mod/view_ip.html

@@ -45,7 +45,7 @@
 						</td>
 						{% if mod|hasPermission(config.mod.remove_notes) %}
 							<td class="minimal">
-								<a href="?/IP/{{ ip|url_encode(true) }}/remove_note/{{ note.id }}">
+								<a href="?/IP/{{ ip|cloak_ip|url_encode(true) }}/remove_note/{{ note.id }}">
 									<small>[{% trans 'remove' %}]</small>
 								</a>
 							</td>
@@ -102,7 +102,7 @@
 					</tr>
 					<tr>
 						<th>{% trans 'IP' %}</th>
-						<td>{{ ban.mask }}</td>
+						<td>{{ ban.cmask }}</td>
 					</tr>
 					<tr>
 						<th>{% trans 'Reason' %}</th>
@@ -169,7 +169,7 @@
 {% if mod|hasPermission(config.mod.ban) %}
 	<fieldset>
 		<legend>{% trans 'New ban' %}</legend>
-		{% set redirect = '?/IP/' ~ ip ~ '#bans' %}
+		{% set redirect = '?/IP/' ~ ip|cloak_ip ~ '#bans' %}
 		{% include 'mod/ban_form.html' %}
 	</fieldset>
 {% endif %}

templates/post/ip.html

@@ -1,3 +1,3 @@
 {% if post.mod and post.mod|hasPermission(config.mod.show_ip, board.uri) %}  
-	 [<a class="ip-link" style="margin:0;" href="?/IP/{{ post.ip }}">{{ post.ip }}</a>]  
+	 [<a class="ip-link" style="margin:0;" href="?/IP/{{ post.ip|cloak_ip }}">{{ post.ip|cloak_ip }}</a>]
 {% endif %}