Commit b56e4e76 authored by bunkerity's avatar bunkerity
Browse files

dnsbl feature

parent 1654e913
access_by_lua_block {
-- get client IP
local ip = ngx.var.remote_addr
-- check if IP is in cache
local cached = ngx.shared.dnsblcache:get(ip)
if cached ~= nil then
if cached == "ok" then
ngx.exit(ngx.OK)
else
ngx.exit(ngx.HTTP_FORBIDDEN)
end
end
-- get the reverse DNS
local rdns = ""
local both = false
local resolver = require "resty.dns.resolver"
local resolvers = {%DNSBL_RESOLVERS%}
local r, err = resolver:new{nameservers=resolvers, retrans=2, timeout=2000}
if not r then
ngx.exit(ngx.OK)
end
local answers, err = r:reverse_query(ip)
if not answers.errcode then
for ak, av in pairs(answers) do
if av.ptrdname then
rdns = av.ptrdname
break
end
end
end
if rdns ~= "" then
local answers, err, tries = r:query(rdns, nil, {})
for ak, av in pairs(answers) do
if av.address and av.address == ip then
both = true
break
end
end
end
-- check if it's a legitimate SE crawler
local ips = {"23.21.227.69", "40.88.21.235", "50.16.241.113", "50.16.241.114", "50.16.241.117", "50.16.247.234", "52.204.97.54", "52.5.190.19", "54.197.234.188", "54.208.100.253", "54.208.102.37", "107.21.1.8"}
local domains = {".googlebot.com", ".google.com", ".search.msn.com", ".crawl.yahoot.net", ".crawl.baidu.jp", ".crawl.baidu.com", ".yandex.com", ".yandex.ru", ".yandex.net"}
for k, v in pairs(ips) do
if v == ip then
ngx.shared.dnsblcache:set(ip, "ok", 86400)
ngx.exit(ngx.OK)
end
end
if both and rdns ~= "" then
for k, v in pairs(domains) do
if rdns:sub(-#v) == v then
ngx.shared.dnsblcache:set(ip, "ok", 86400)
ngx.exit(ngx.OK)
end
end
end
-- dnsbl check
local dnsbls = {%DNSBL_LIST%}
for k, v in pairs(dnsbls) do
local name = resolver.arpa_str(ip)
name = name:gsub("%.in%-addr%.arpa", ""):gsub("%.ip6%.arpa", "") .. "." .. v
local answers, err, tries = r:query(name, nil, {})
if not answers.errcode then
for ak, av in pairs(answers) do
if av.address then
a,b,c,d = av.address:match("([%d]+).([%d]+).([%d]+).([%d]+)")
if a == "127" then
ngx.shared.dnsblcache:set(ip, "dnsbl", 86400)
ngx.exit(ngx.HTTP_FORBIDDEN)
end
end
end
end
end
-- legitimate user
ngx.shared.dnsblcache:set(ip, "ok", 86400)
ngx.exit(ngx.OK)
}
......@@ -67,7 +67,8 @@ http {
# lua path
lua_package_path "/usr/local/lib/lua/?.lua;;";
# lua_shared_dict somecache 10m;
%DNSBL_CACHE%
lua_shared_dict dnsblcache 10m;
# server config
include /etc/nginx/server.conf;
......
......@@ -11,6 +11,7 @@ server {
{
return 405;
}
%DNSBL%
%AUTH_BASIC%
%USE_PHP%
%HEADER_SERVER%
......
......@@ -34,6 +34,18 @@ function replace_in_file() {
sed -i "s/$pattern/$replace/g" "$1"
}
# convert space separated values to LUA
function spaces_to_lua() {
for element in $1 ; do
if [ "$result" = "" ] ; then
result="$element"
else
result="${result}, \"${element}\""
fi
done
echo "$result"
}
# copy stub confs
cp /opt/confs/*.conf /etc/nginx
cp -r /opt/confs/owasp-crs /etc/nginx
......@@ -108,6 +120,10 @@ USE_HTTPS_CUSTOM="${USE_HTTPS_CUSTOM-no}"
ROOT_FOLDER="${ROOT_FOLDER-/www}"
LOGROTATE_MINSIZE="${LOGROTATE_MINSIZE-10M}"
LOGROTATE_MAXAGE="${LOGROTATE_MAXAGE-7}"
USE_DNSBL="${USE_DNSBL-yes}"
DNSBL_CACHE="${DNSBL_CACHE-10m}"
DNSBL_RESOLVERS="${DNSBL_RESOLVERS-8.8.8.8 8.8.4.4}"
DNSBL_LIST="${DNSBL_LIST-bl.blocklist.de problems.dnsbl.sorbs.net sbl.spamhaus.org xbl.spamhaus.org}"
# install additional modules if needed
if [ "$ADDITIONAL_MODULES" != "" ] ; then
......@@ -361,6 +377,17 @@ if [ "$USE_AUTH_BASIC" = "yes" ] ; then
else
replace_in_file "/etc/nginx/server.conf" "%AUTH_BASIC%" ""
fi
if [ "$USE_DNSBL" = "yes" ] ; then
replace_in_file "/etc/nginx/nginx.conf" "%DNSBL_CACHE%" "lua_shared_dict dnsblcache $DNSBL_CACHE;"
replace_in_file "/etc/nginx/server.conf" "%DNSBL%" "include /etc/nginx/dnsbl.conf;"
resolvers=$(spaces_to_lua "$DNSBL_RESOLVERS")
list=$(spaces_to_lua "$DNSBL_LIST")
replace_in_file "/etc/nginx/dnsbl.conf" "%DNSBL_RESOLVERS%" "$resolvers"
replace_in_file "/etc/nginx/dnsbl.conf" "%DNSBL_LIST%" "$list"
else
replace_in_file "/etc/nginx/nginx.conf" "%DNSBL_CACHE%" ""
replace_in_file "/etc/nginx/server.conf" "%DNSBL%" ""
fi
# fail2ban setup
if [ "$USE_FAIL2BAN" = "yes" ] ; then
......
<?php
echo "Bunkerity FTW !";
?>
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