335 lines
11 KiB
PHP
335 lines
11 KiB
PHP
<?php
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/*
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* Name: IP Ban
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* Author: Shish <webmaster@shishnet.org>
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* Link: http://code.shishnet.org/shimmie2/
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* License: GPLv2
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* Description: Ban IP addresses
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* Documentation:
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* <b>Adding a Ban</b>
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* <br>IP: Can be a single IP (eg. 123.234.210.21), or a CIDR block (eg. 152.23.43.0/24)
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* <br>Reason: Any text, for the admin to remember why the ban was put in place
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* <br>Until: Either a date in YYYY-MM-DD format, or an offset like "3 days"
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*/
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// RemoveIPBanEvent {{{
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class RemoveIPBanEvent extends Event
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{
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public $id;
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public function __construct(int $id)
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{
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$this->id = $id;
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}
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}
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// }}}
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// AddIPBanEvent {{{
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class AddIPBanEvent extends Event
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{
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public $ip;
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public $reason;
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public $end;
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public function __construct(string $ip, string $reason, string $end)
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{
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$this->ip = trim($ip);
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$this->reason = trim($reason);
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$this->end = trim($end);
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}
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}
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// }}}
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class IPBan extends Extension
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{
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public function get_priority(): int
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{
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return 10;
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}
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public function onInitExt(InitExtEvent $event)
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{
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global $config;
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if ($config->get_int("ext_ipban_version") < 8) {
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$this->install();
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}
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$config->set_default_string(
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"ipban_message",
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'<p>IP <b>$IP</b> has been banned until <b>$DATE</b> by <b>$ADMIN</b> because of <b>$REASON</b>
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<p>If you couldn\'t possibly be guilty of what you\'re banned for, the person we banned probably had a dynamic IP address and so do you.
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<p>See <a href="http://whatismyipaddress.com/dynamic-static">http://whatismyipaddress.com/dynamic-static</a> for more information.
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<p>$CONTACT'
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);
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$this->check_ip_ban();
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}
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public function onPageRequest(PageRequestEvent $event)
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{
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if ($event->page_matches("ip_ban")) {
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global $page, $user;
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if ($user->can(Permissions::BAN_IP)) {
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if ($event->get_arg(0) == "add" && $user->check_auth_token()) {
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if (isset($_POST['ip']) && isset($_POST['reason']) && isset($_POST['end'])) {
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if (empty($_POST['end'])) {
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$end = null;
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} else {
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$end = $_POST['end'];
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}
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send_event(new AddIPBanEvent($_POST['ip'], $_POST['reason'], $end));
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flash_message("Ban for {$_POST['ip']} added");
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$page->set_mode(PageMode::REDIRECT);
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$page->set_redirect(make_link("ip_ban/list"));
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}
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} elseif ($event->get_arg(0) == "remove" && $user->check_auth_token()) {
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if (isset($_POST['id'])) {
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send_event(new RemoveIPBanEvent($_POST['id']));
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flash_message("Ban removed");
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$page->set_mode(PageMode::REDIRECT);
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$page->set_redirect(make_link("ip_ban/list"));
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}
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} elseif ($event->get_arg(0) == "list") {
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$bans = (isset($_GET["all"])) ? $this->get_bans() : $this->get_active_bans();
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$this->theme->display_bans($page, $bans);
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}
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} else {
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$this->theme->display_permission_denied();
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}
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}
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}
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public function onSetupBuilding(SetupBuildingEvent $event)
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{
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$sb = new SetupBlock("IP Ban");
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$sb->add_longtext_option("ipban_message", 'Message to show to banned users:<br>(with $IP, $DATE, $ADMIN, $REASON, and $CONTACT)');
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$event->panel->add_block($sb);
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}
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public function onUserBlockBuilding(UserBlockBuildingEvent $event)
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{
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global $user;
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if ($user->can(Permissions::BAN_IP)) {
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$event->add_link("IP Bans", make_link("ip_ban/list"));
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}
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}
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public function onAddIPBan(AddIPBanEvent $event)
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{
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global $user, $database;
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$sql = "INSERT INTO bans (ip, reason, end_timestamp, banner_id) VALUES (:ip, :reason, :end, :admin_id)";
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$database->Execute($sql, ["ip"=>$event->ip, "reason"=>$event->reason, "end"=>strtotime($event->end), "admin_id"=>$user->id]);
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$database->cache->delete("ip_bans_sorted");
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log_info("ipban", "Banned {$event->ip} because '{$event->reason}' until {$event->end}");
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}
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public function onRemoveIPBan(RemoveIPBanEvent $event)
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{
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global $database;
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$ban = $database->get_row("SELECT * FROM bans WHERE id = :id", ["id"=>$event->id]);
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if ($ban) {
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$database->Execute("DELETE FROM bans WHERE id = :id", ["id"=>$event->id]);
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$database->cache->delete("ip_bans_sorted");
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log_info("ipban", "Removed {$ban['ip']}'s ban");
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}
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}
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// installer {{{
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protected function install()
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{
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global $database;
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global $config;
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// shortcut to latest
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if ($config->get_int("ext_ipban_version") < 1) {
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$database->create_table("bans", "
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id SCORE_AIPK,
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banner_id INTEGER NOT NULL,
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ip SCORE_INET NOT NULL,
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end_timestamp INTEGER,
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reason TEXT NOT NULL,
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added SCORE_DATETIME NOT NULL DEFAULT SCORE_NOW,
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FOREIGN KEY (banner_id) REFERENCES users(id) ON DELETE CASCADE,
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");
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$database->execute("CREATE INDEX bans__end_timestamp ON bans(end_timestamp)");
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$config->set_int("ext_ipban_version", 8);
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}
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// ===
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if ($config->get_int("ext_ipban_version") < 1) {
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$database->Execute("CREATE TABLE bans (
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id int(11) NOT NULL auto_increment,
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ip char(15) default NULL,
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date SCORE_DATETIME default NULL,
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end SCORE_DATETIME default NULL,
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reason varchar(255) default NULL,
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PRIMARY KEY (id)
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)");
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$config->set_int("ext_ipban_version", 1);
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}
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if ($config->get_int("ext_ipban_version") == 1) {
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$database->execute("ALTER TABLE bans ADD COLUMN banner_id INTEGER NOT NULL AFTER id");
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$config->set_int("ext_ipban_version", 2);
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}
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if ($config->get_int("ext_ipban_version") == 2) {
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$database->execute("ALTER TABLE bans DROP COLUMN date");
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$database->execute("ALTER TABLE bans CHANGE ip ip CHAR(20) NOT NULL");
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$database->execute("ALTER TABLE bans CHANGE reason reason TEXT NOT NULL");
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$database->execute("CREATE INDEX bans__end ON bans(end)");
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$config->set_int("ext_ipban_version", 3);
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}
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if ($config->get_int("ext_ipban_version") == 3) {
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$database->execute("ALTER TABLE bans CHANGE end old_end DATE NOT NULL");
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$database->execute("ALTER TABLE bans ADD COLUMN end INTEGER");
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$database->execute("UPDATE bans SET end = UNIX_TIMESTAMP(old_end)");
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$database->execute("ALTER TABLE bans DROP COLUMN old_end");
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$database->execute("CREATE INDEX bans__end ON bans(end)");
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$config->set_int("ext_ipban_version", 4);
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}
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if ($config->get_int("ext_ipban_version") == 4) {
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$database->execute("ALTER TABLE bans CHANGE end end_timestamp INTEGER");
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$config->set_int("ext_ipban_version", 5);
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}
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if ($config->get_int("ext_ipban_version") == 5) {
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$database->execute("ALTER TABLE bans CHANGE ip ip VARCHAR(15)");
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$config->set_int("ext_ipban_version", 6);
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}
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if ($config->get_int("ext_ipban_version") == 6) {
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$database->Execute("ALTER TABLE bans ADD FOREIGN KEY (banner_id) REFERENCES users(id) ON DELETE CASCADE");
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$config->set_int("ext_ipban_version", 7);
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}
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if ($config->get_int("ext_ipban_version") == 7) {
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$database->execute($database->scoreql_to_sql("ALTER TABLE bans CHANGE ip ip SCORE_INET"));
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$database->execute($database->scoreql_to_sql("ALTER TABLE bans ADD COLUMN added SCORE_DATETIME NOT NULL DEFAULT SCORE_NOW"));
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$config->set_int("ext_ipban_version", 8);
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}
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}
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// }}}
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// deal with banned person {{{
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private function check_ip_ban()
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{
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$remote = $_SERVER['REMOTE_ADDR'];
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$bans = $this->get_active_bans_sorted();
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// bans[0] = IPs
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if (isset($bans[0][$remote])) {
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$this->block($remote); // never returns
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}
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// bans[1] = CIDR nets
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foreach ($bans[1] as $ip => $true) {
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if (ip_in_range($remote, $ip)) {
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$this->block($remote); // never returns
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}
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}
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}
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private function block(string $remote)
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{
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global $config, $database;
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$prefix = ($database->get_driver_name() == DatabaseDriver::SQLITE ? "bans." : "");
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$bans = $this->get_active_bans();
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foreach ($bans as $row) {
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$ip = $row[$prefix."ip"];
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if (
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(strstr($ip, '/') && ip_in_range($remote, $ip)) ||
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($ip == $remote)
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) {
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$reason = $row[$prefix.'reason'];
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$admin = User::by_id($row[$prefix.'banner_id']);
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$date = date("Y-m-d", $row[$prefix.'end_timestamp']);
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$msg = $config->get_string("ipban_message");
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$msg = str_replace('$IP', $ip, $msg);
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$msg = str_replace('$DATE', $date, $msg);
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$msg = str_replace('$ADMIN', $admin->name, $msg);
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$msg = str_replace('$REASON', $reason, $msg);
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$contact_link = contact_link();
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if (!empty($contact_link)) {
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$msg = str_replace('$CONTACT', "<a href='$contact_link'>Contact the staff (be sure to include this message)</a>", $msg);
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} else {
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$msg = str_replace('$CONTACT', "", $msg);
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}
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header("HTTP/1.0 403 Forbidden");
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print "$msg";
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exit;
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}
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}
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log_error("ipban", "block($remote) called but no bans matched");
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exit;
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}
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// }}}
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// database {{{
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private function get_bans()
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{
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global $database;
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$bans = $database->get_all("
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SELECT bans.*, users.name as banner_name
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FROM bans
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JOIN users ON banner_id = users.id
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ORDER BY added, end_timestamp, bans.id
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");
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if ($bans) {
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return $bans;
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} else {
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return [];
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}
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}
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private function get_active_bans()
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{
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global $database;
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$bans = $database->get_all("
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SELECT bans.*, users.name as banner_name
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FROM bans
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JOIN users ON banner_id = users.id
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WHERE (end_timestamp > :end_timestamp) OR (end_timestamp IS NULL)
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ORDER BY end_timestamp, bans.id
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", ["end_timestamp"=>time()]);
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if ($bans) {
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return $bans;
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} else {
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return [];
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}
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}
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// returns [ips, nets]
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private function get_active_bans_sorted()
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{
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global $database;
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$cached = $database->cache->get("ip_bans_sorted");
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if ($cached) {
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return $cached;
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}
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$bans = $this->get_active_bans();
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$ips = []; # "0.0.0.0" => false);
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$nets = []; # "0.0.0.0/32" => false);
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foreach ($bans as $row) {
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if (strstr($row['ip'], '/')) {
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$nets[$row['ip']] = true;
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} else {
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$ips[$row['ip']] = true;
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}
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}
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$sorted = [$ips, $nets];
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$database->cache->set("ip_bans_sorted", $sorted, 600);
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return $sorted;
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}
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// }}}
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}
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