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142 lines
5.1 KiB
142 lines
5.1 KiB
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#!trydef ANTIFLOOD_RATE_WINDOW 2
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#!trydef ANTIFLOOD_RATE_DENSITY 50
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#!trydef ANTIFLOOD_RATE_EXPIRE 4
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#!trydef ANTIFLOOD_FAILED_AUTH_WINDOW 300
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#!trydef ANTIFLOOD_FAILED_AUTH_DENSITY 4
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#!trydef ANTIFLOOD_FAILED_AUTH_USE_PORT 1
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#!trydef ANTIFLOOD_FAILED_AUTH_ACTION 2
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#!trydef ANTIFLOOD_RATE_LIMIT_ENABLED 1
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#!trydef ANTIFLOOD_AUTH_LIMIT_ENABLED 1
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#!trydef ANTIFLOOD_RATE_DROP 1
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#!trydef ANTIFLOOD_CACHE_PERIOD 300
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#!substdef "!ANTIFLOOD_SUBST_CACHE_PERIOD!$def(ANTIFLOOD_CACHE_PERIOD)!g"
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######## Flood Prevention Hash Tables ########
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modparam("htable", "htable", "antiflood=>size=16;autoexpire=ANTIFLOOD_SUBST_CACHE_PERIOD;initval=0")
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######## Flood Prevention Module ########
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loadmodule "pike.so"
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modparam("pike", "sampling_time_unit", ANTIFLOOD_RATE_WINDOW)
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modparam("pike", "reqs_density_per_unit", ANTIFLOOD_RATE_DENSITY)
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modparam("pike", "remove_latency", ANTIFLOOD_RATE_EXPIRE)
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kazoo.antiflood_failed_auth_use_port = ANTIFLOOD_FAILED_AUTH_USE_PORT descr "should we keep track of ip and port for auth failures"
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kazoo.antiflood_failed_auth_action = ANTIFLOOD_FAILED_AUTH_ACTION descr "0 - log, 1 - drop, 2 - reply with 403"
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kazoo.antiflood_rate_limit_enabled = ANTIFLOOD_RATE_LIMIT_ENABLED descr "antiflood rate limit enabled"
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kazoo.antiflood_auth_limit_enabled = ANTIFLOOD_AUTH_LIMIT_ENABLED descr "antiflood auth limit enabled"
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kazoo.antiflood_rate_drop = ANTIFLOOD_RATE_DROP descr "should we drop on rate limit"
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route[ANTIFLOOD_LIMIT]
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{
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if($sel(cfg_get.kazoo.antiflood_rate_limit_enabled) == 1) {
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route(ANTIFLOOD_RATE_LIMIT);
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}
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if($sel(cfg_get.kazoo.antiflood_auth_limit_enabled) == 1) {
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route(ANTIFLOOD_AUTH_LIMIT);
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}
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}
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route[ANTIFLOOD_RATE_LIMIT]
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{
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if (has_totag()
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|| isflagset(FLAG_TRUSTED_SOURCE)
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|| isflagset(FLAG_INTERNALLY_SOURCED)) {
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return;
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}
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# use pike to control the rates
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if (!pike_check_req()) {
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if($sel(cfg_get.kazoo.antiflood_rate_drop) == 1) {
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xlog("L_WARN", "$ci|end|dropping request from $fu due to rate of requests with source $si:$sp\n");
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drop();
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} else {
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xlog("L_WARN", "$ci|antiflood|request from $fu exceeded rate of requests with source $si:$sp\n");
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}
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}
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}
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route[ANTIFLOOD_AUTH_LIMIT]
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{
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if (has_totag()
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|| isflagset(FLAG_TRUSTED_SOURCE)
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|| isflagset(FLAG_INTERNALLY_SOURCED)) {
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return(1);
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}
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if (is_method("OPTIONS")) return(1);
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$var(auth_key) = "";
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if($sel(cfg_get.kazoo.antiflood_failed_auth_use_port) == 1) {
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$var(auth_key) = $_s("$Au::$si::$sp");
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} else {
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$var(auth_key) = $_s("$Au::$si");
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}
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if ($Au != $null &&
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$sht(antiflood=>$var(auth_key)::count) >= ANTIFLOOD_FAILED_AUTH_DENSITY
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) {
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$shtex(antiflood=>$var(auth_key)::count) = ANTIFLOOD_FAILED_AUTH_WINDOW;
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$sht(antiflood=>$var(auth_key)::last) = $Ts;
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if($sel(cfg_get.kazoo.antiflood_failed_auth_action) == 1) {
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xlog("L_WARNING", "$ci|end|dropping request authorization failure limit $def(ANTIFLOOD_FAILED_AUTH_DENSITY) for $Au $si:$sp\n");
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drop();
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} else if($sel(cfg_get.kazoo.antiflood_failed_auth_action) == 2) {
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xlog("L_NOTICE", "$ci|end|authorization failure limit $def(ANTIFLOOD_FAILED_AUTH_DENSITY) for $Au $si:$sp\n");
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append_to_reply("Retry-After: 3600\r\n");
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send_reply("403", "Forbidden");
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exit;
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} else {
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xlog("L_NOTICE", "$ci|antiflood|authorization failure limit $def(ANTIFLOOD_FAILED_AUTH_DENSITY) for $Au $si:$sp\n");
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}
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}
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}
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route[ANTIFLOOD_SUCCESSFUL_AUTH]
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{
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if($sel(cfg_get.kazoo.antiflood_failed_auth_use_port) == 1) {
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sht_rm_name_re("antiflood=>$(Au{re.subst,/\\./\\\\./g})::$(si{re.subst,/\\./\\\\./g})::$sp::.*");
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} else {
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sht_rm_name_re("antiflood=>$(Au{re.subst,/\\./\\\\./g})::$(si{re.subst,/\\./\\\\./g})::.*");
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}
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}
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route[ANTIFLOOD_RESET_AUTH]
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{
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$var(user) = $(kzE{kz.json,Username}) + "@" + $(kzE{kz.json,Realm});
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sht_rm_name_re("antiflood=>$(var(user){re.subst,/\\./\\\\./g})::.*");
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}
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route[ANITFLOOD_FAILED_AUTH]
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{
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if (isflagset(FLAG_TRUSTED_SOURCE)) {
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return;
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}
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$var(auth_key) = "";
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if($sel(cfg_get.kazoo.antiflood_failed_auth_use_port) == 1) {
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$var(auth_key) = $_s("$Au::$si::$sp");
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} else {
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$var(auth_key) = $_s("$Au::$si");
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}
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$var(count) = $shtinc(antiflood=>$var(auth_key)::count);
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$sht(antiflood=>$var(auth_key)::last) = $Ts;
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xlog("L_INFO", "$ci|antiflood|$var(count) errounous authorization response for $Au $si:$sp\n");
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if ($var(count) >= ANTIFLOOD_FAILED_AUTH_DENSITY) {
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$var(exp) = $Ts - ANTIFLOOD_FAILED_AUTH_WINDOW;
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if($sht(antiflood=>$var(auth_key)::last) > $var(exp)) {
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xlog("L_NOTICE", "$ci|end|request at authorization failure limit $def(ANTIFLOOD_FAILED_AUTH_DENSITY) for $Au $si:$sp\n");
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append_to_reply("Retry-After: 3600\r\n");
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send_reply("403", "Forbidden");
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exit;
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}
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}
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}
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event_route[htable:expired:antiflood]
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{
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xlog("L_NOTICE", "event|antiflood|antiflood expired record $shtrecord(key) => $shtrecord(value)\n");
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}
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