Add the greylisting feature
This commit is contained in:
TheophileDiot
parent
94ce249d74
commit
27b4ff330c
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@ -0,0 +1,247 @@
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local _M = {}
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_M.__index = _M
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local utils = require "utils"
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local datastore = require "datastore"
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local logger = require "logger"
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local cjson = require "cjson"
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local ipmatcher = require "resty.ipmatcher"
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function _M.new()
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local self = setmetatable({}, _M)
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return self, nil
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end
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function _M:init()
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-- Check if init is needed
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local init_needed, err = utils.has_variable("USE_GREYLIST", "yes")
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if init_needed == nil then
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return false, err
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end
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if not init_needed then
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return true, "no service uses Greylist, skipping init"
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end
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-- Read greylists
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local greylists = {
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["IP"] = {},
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["RDNS"] = {},
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["ASN"] = {},
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["USER_AGENT"] = {},
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["URI"] = {}
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}
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local i = 0
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for kind, _ in pairs(greylists) do
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local f, err = io.open("/opt/bunkerweb/cache/greylist/" .. kind .. ".list", "r")
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if f then
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for line in f:lines() do
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table.insert(greylists[kind], line)
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i = i + 1
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end
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f:close()
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end
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end
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-- Load them into datastore
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local ok, err = datastore:set("plugin_greylist_list", cjson.encode(greylists))
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if not ok then
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return false, "can't store Greylist list into datastore : " .. err
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end
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return true, "successfully loaded " .. tostring(i) .. " greylisted IP/network/rDNS/ASN/User-Agent/URI"
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end
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function _M:access()
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-- Check if access is needed
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local access_needed, err = utils.get_variable("USE_GREYLIST")
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if access_needed == nil then
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return false, err, false, nil
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end
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if access_needed ~= "yes" then
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return true, "Greylist not activated", false, nil
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end
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-- Check the cache
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local cached_ip, err = self:is_in_cache("ip" .. ngx.var.remote_addr)
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if cached_ip and cached_ip ~= "ok" then
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return true, "IP is in greylist cache (info = " .. cached_ip .. ")", false, ngx.OK
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end
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local cached_uri, err = self:is_in_cache("uri" .. ngx.var.uri)
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if cached_uri and cached_uri ~= "ok" then
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return true, "URI is in greylist cache (info = " .. cached_uri .. ")", false, ngx.OK
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end
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local cached_ua = true
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if ngx.var.http_user_agent then
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cached_ua, err = self:is_in_cache("ua" .. ngx.var.http_user_agent)
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if cached_ua and cached_ua ~= "ok" then
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return true, "User-Agent is in greylist cache (info = " .. cached_ua .. ")", false, ngx.OK
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end
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end
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if cached_ip and cached_uri and cached_ua then
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return true, "full request is in greylist cache (not greylisted)", false, nil
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end
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-- Get list
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local data, err = datastore:get("plugin_greylist_list")
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if not data then
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return false, "can't get Greylist list : " .. err, false, nil
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end
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local ok, greylists = pcall(cjson.decode, data)
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if not ok then
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return false, "error while decoding greylists : " .. greylists, false, nil
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end
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-- Return value
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local ret, ret_err = true, "success"
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-- Check if IP is in IP/net greylist
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local ip_net, err = utils.get_variable("GREYLIST_IP")
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if ip_net and ip_net ~= "" then
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for element in ip_net:gmatch("%S+") do
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table.insert(greylists["IP"], element)
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end
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end
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if not cached_ip then
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local ipm, err = ipmatcher.new(greylists["IP"])
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if not ipm then
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ret = false
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ret_err = "can't instantiate ipmatcher " .. err
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else
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if ipm:match(ngx.var.remote_addr) then
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self:add_to_cache("ip" .. ngx.var.remote_addr, "ip/net")
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return ret, "client IP " .. ngx.var.remote_addr .. " is in greylist", false, ngx.OK
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end
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end
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end
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-- Check if rDNS is in greylist
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local rdns_global, err = utils.get_variable("GREYLIST_RDNS_GLOBAL")
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local check = true
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if not rdns_global then
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logger.log(ngx.ERR, "GREYLIST", "Error while getting GREYLIST_RDNS_GLOBAL variable : " .. err)
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elseif rdns_global == "yes" then
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check, err = utils.ip_is_global(ngx.var.remote_addr)
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if check == nil then
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logger.log(ngx.ERR, "GREYLIST", "Error while getting checking if IP is global : " .. err)
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end
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end
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if not cached_ip and check then
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local rdns, err = utils.get_rdns(ngx.var.remote_addr)
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if not rdns then
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ret = false
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ret_err = "error while trying to get reverse dns : " .. err
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else
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local rdns_list, err = utils.get_variable("GREYLIST_RDNS")
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if rdns_list and rdns_list ~= "" then
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for element in rdns_list:gmatch("%S+") do
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table.insert(greylists["RDNS"], element)
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end
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end
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for i, suffix in ipairs(greylists["RDNS"]) do
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if rdns:sub(- #suffix) == suffix then
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self:add_to_cache("ip" .. ngx.var.remote_addr, "rDNS " .. suffix)
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return ret, "client IP " .. ngx.var.remote_addr .. " is in greylist (info = rDNS " .. suffix .. ")", false, ngx.OK
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end
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end
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end
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end
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-- Check if ASN is in greylist
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if not cached_ip then
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if utils.ip_is_global(ngx.var.remote_addr) then
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local asn, err = utils.get_asn(ngx.var.remote_addr)
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if not asn then
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ret = false
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ret_err = "error while trying to get asn number : " .. err
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else
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local asn_list, err = utils.get_variable("GREYLIST_ASN")
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if asn_list and asn_list ~= "" then
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for element in asn_list:gmatch("%S+") do
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table.insert(greylists["ASN"], element)
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end
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end
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for i, asn_bl in ipairs(greylists["ASN"]) do
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if tostring(asn) == asn_bl then
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self:add_to_cache("ip" .. ngx.var.remote_addr, "ASN " .. tostring(asn))
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return ret, "client IP " .. ngx.var.remote_addr .. " is in greylist (kind = ASN " .. tostring(asn) .. ")", false,
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ngx.OK
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end
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end
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end
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end
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end
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-- IP is not greylisted
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local ok, err = self:add_to_cache("ip" .. ngx.var.remote_addr, "ok")
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if not ok then
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ret = false
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ret_err = err
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end
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-- Check if User-Agent is in greylist
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if not cached_ua and ngx.var.http_user_agent then
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local ua_list, err = utils.get_variable("GREYLIST_USER_AGENT")
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if ua_list and ua_list ~= "" then
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for element in ua_list:gmatch("%S+") do
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table.insert(greylists["USER_AGENT"], element)
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end
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end
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for i, ua_bl in ipairs(greylists["USER_AGENT"]) do
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if ngx.var.http_user_agent:match(ua_bl) then
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self:add_to_cache("ua" .. ngx.var.http_user_agent, "UA " .. ua_bl)
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return ret, "client User-Agent " .. ngx.var.http_user_agent .. " is in greylist (matched " .. ua_bl .. ")", false,
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ngx.OK
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end
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end
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-- UA is not greylisted
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local ok, err = self:add_to_cache("ua" .. ngx.var.http_user_agent, "ok")
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if not ok then
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ret = false
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ret_err = err
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end
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end
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-- Check if URI is in greylist
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if not cached_uri then
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local uri_list, err = utils.get_variable("GREYLIST_URI")
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if uri_list and uri_list ~= "" then
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for element in uri_list:gmatch("%S+") do
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table.insert(greylists["URI"], element)
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end
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end
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for i, uri_bl in ipairs(greylists["URI"]) do
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if ngx.var.uri:match(uri_bl) then
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self:add_to_cache("uri" .. ngx.var.uri, "URI " .. uri_bl)
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return ret, "client URI " .. ngx.var.uri .. " is in greylist (matched " .. uri_bl .. ")", false, ngx.OK
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end
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end
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end
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-- URI is not greylisted
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local ok, err = self:add_to_cache("uri" .. ngx.var.uri, "ok")
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if not ok then
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ret = false
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ret_err = err
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end
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return ret, "IP is not in list (error = " .. ret_err .. ")", true, utils.get_deny_status()
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end
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function _M:is_in_cache(ele)
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local kind, err = datastore:get("plugin_greylist_cache_" .. ngx.var.server_name .. ele)
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if not kind then
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if err ~= "not found" then
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logger.log(ngx.ERR, "GREYLIST", "Error while accessing cache : " .. err)
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end
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return false, err
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end
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return kind, "success"
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end
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function _M:add_to_cache(ele, kind)
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local ok, err = datastore:set("plugin_greylist_cache_" .. ngx.var.server_name .. ele, kind, 3600)
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if not ok then
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logger.log(ngx.ERR, "GREYLIST", "Error while adding element to cache : " .. err)
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return false, err
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end
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return true, "success"
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end
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return _M
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@ -0,0 +1,152 @@
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#!/usr/bin/python3
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import sys, os, traceback
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sys.path.append("/opt/bunkerweb/deps/python")
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sys.path.append("/opt/bunkerweb/utils")
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import logger, jobs, requests, ipaddress
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def check_line(kind, line) :
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if kind == "IP" :
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if "/" in line :
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try :
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ipaddress.ip_network(line)
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return True, line
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except :
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pass
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else :
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try :
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ipaddress.ip_address(line)
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return True, line
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except :
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pass
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return False, ""
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elif kind == "RDNS" :
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if re.match(r"^(\.?[A-Za-z0-9\-]+)*\.[A-Za-z]{2,}$", line) :
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return True, line.lower()
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return False, ""
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elif kind == "ASN" :
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real_line = line.replace("AS", "")
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if re.match(r"^\d+$", real_line) :
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return True, real_line
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elif kind == "USER_AGENT" :
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return True, line.replace("\\ ", " ").replace("\\.", "%.").replace("\\\\", "\\").replace("-", "%-")
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elif kind == "URI" :
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if re.match(r"^/", line) :
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return True, line
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return False, ""
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status = 0
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try :
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# Check if at least a server has Greylist activated
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greylist_activated = False
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# Multisite case
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if os.getenv("MULTISITE") == "yes" :
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for first_server in os.getenv("SERVER_NAME").split(" ") :
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if os.getenv(first_server + "_USE_GREYLIST", os.getenv("USE_GREYLIST")) == "yes" :
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greylist_activated = True
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break
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# Singlesite case
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elif os.getenv("USE_GREYLIST") == "yes" :
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greylist_activated = True
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if not greylist_activated :
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logger.log("GREYLIST", "ℹ️", "Greylist is not activated, skipping downloads...")
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os._exit(0)
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# Create directories if they don't exist
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os.makedirs("/opt/bunkerweb/cache/greylist", exist_ok=True)
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os.makedirs("/opt/bunkerweb/tmp/greylist", exist_ok=True)
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# Our urls data
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urls = {
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"IP": [],
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"RDNS": [],
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"ASN" : [],
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"USER_AGENT": [],
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"URI": []
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}
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# Don't go further if the cache is fresh
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kinds_fresh = {
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"IP": True,
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"RDNS": True,
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"ASN" : True,
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"USER_AGENT": True,
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"URI": True
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}
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all_fresh = True
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for kind in kinds_fresh :
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if not jobs.is_cached_file("/opt/bunkerweb/cache/greylist/" + kind + ".list", "hour") :
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kinds_fresh[kind] = False
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all_fresh = False
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logger.log("GREYLIST", "ℹ️", "Greylist for " + kind + " is not cached, processing downloads...")
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else :
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logger.log("GREYLIST", "ℹ️", "Greylist for " + kind + " is already in cache, skipping downloads...")
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if all_fresh :
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os._exit(0)
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# Get URLs
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urls = {
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"IP": [],
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"RDNS": [],
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"ASN" : [],
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"USER_AGENT": [],
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"URI": []
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}
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for kind in urls :
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for url in os.getenv("GREYLIST_" + kind + "_URLS", "").split(" ") :
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if url != "" and url not in urls[kind] :
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urls[kind].append(url)
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# Loop on kinds
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for kind, urls_list in urls.items() :
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if kinds_fresh[kind] :
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continue
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# Write combined data of the kind to a single temp file
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for url in urls_list :
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try :
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logger.log("GREYLIST", "ℹ️", "Downloading greylist data from " + url + " ...")
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resp = requests.get(url, stream=True)
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if resp.status_code != 200 :
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continue
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i = 0
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with open("/opt/bunkerweb/tmp/greylist/" + kind + ".list", "w") as f :
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for line in resp.iter_lines(decode_unicode=True) :
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line = line.strip()
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if kind != "USER_AGENT" :
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line = line.strip().split(" ")[0]
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if line == "" or line.startswith("#") or line.startswith(";") :
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continue
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ok, data = check_line(kind, line)
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if ok :
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f.write(data + "\n")
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i += 1
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logger.log("GREYLIST", "ℹ️", "Downloaded " + str(i) + " bad " + kind)
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# Check if file has changed
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file_hash = jobs.file_hash("/opt/bunkerweb/tmp/greylist/" + kind + ".list")
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cache_hash = jobs.cache_hash("/opt/bunkerweb/cache/greylist/" + kind + ".list")
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if file_hash == cache_hash :
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logger.log("GREYLIST", "ℹ️", "New file " + kind + ".list is identical to cache file, reload is not needed")
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else :
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logger.log("GREYLIST", "ℹ️", "New file " + kind + ".list is different than cache file, reload is needed")
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# Put file in cache
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cached, err = jobs.cache_file("/opt/bunkerweb/tmp/greylist/" + kind + ".list", "/opt/bunkerweb/cache/greylist/" + kind + ".list", file_hash)
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if not cached :
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logger.log("GREYLIST", "❌", "Error while caching greylist : " + err)
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status = 2
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if status != 2 :
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status = 1
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except :
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status = 2
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logger.log("GREYLIST", "❌", "Exception while getting greylist from " + url + " :")
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print(traceback.format_exc())
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except :
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status = 2
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logger.log("GREYLIST", "❌", "Exception while running greylist-download.py :")
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print(traceback.format_exc())
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sys.exit(status)
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@ -0,0 +1,123 @@
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{
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"id": "greylist",
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"order": 2,
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"name": "Greylist",
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"description": "Allow access while keeping security features based on internal and external IP/network/rDNS/ASN greylists.",
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"version": "0.1",
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"settings": {
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"USE_GREYLIST": {
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"context": "multisite",
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"default": "no",
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"help": "Activate greylist feature.",
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"id": "use-greylist",
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"label": "Activate greylisting",
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"regex": "^(yes|no)$",
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"type": "check"
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},
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"GREYLIST_IP_URLS": {
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"context": "global",
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"default": "",
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"help": "List of URLs, separated with spaces, containing good IP/network to put into the greylist.",
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"id": "greylist-ip-urls",
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"label": "Greylist IP/network URLs",
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"regex": "^.*$",
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"type": "text"
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},
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"GREYLIST_IP": {
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"context": "multisite",
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"default": "",
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"help": "List of IP/network, separated with spaces, to put into the greylist.",
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"id": "greylist-ip",
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"label": "Greylist IP/network",
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"regex": "^.*$",
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"type": "text"
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},
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"GREYLIST_RDNS": {
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"context": "multisite",
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"default": "",
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"help": "List of reverse DNS suffixes, separated with spaces, to put into the greylist.",
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"id": "greylist-rdns",
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"label": "Greylist reverse DNS",
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"regex": "^.*$",
|
||||
"type": "text"
|
||||
},
|
||||
"GREYLIST_RDNS_URLS": {
|
||||
"context": "global",
|
||||
"default": "",
|
||||
"help": "List of URLs, separated with spaces, containing reverse DNS suffixes to put into the greylist.",
|
||||
"id": "greylist-rdns-urls",
|
||||
"label": "Greylist reverse DNS URLs",
|
||||
"regex": "^.*$",
|
||||
"type": "text"
|
||||
},
|
||||
"GREYLIST_RDNS_GLOBAL": {
|
||||
"context": "multisite",
|
||||
"default": "yes",
|
||||
"help": "Only perform RDNS greylist checks on global IP addresses.",
|
||||
"id": "greylist-rdns-global",
|
||||
"label": "Greylist reverse DNS global IPs",
|
||||
"regex": "^.*$",
|
||||
"type": "text"
|
||||
},
|
||||
"GREYLIST_ASN": {
|
||||
"context": "multisite",
|
||||
"default": "",
|
||||
"help": "List of ASN numbers, separated with spaces, to put into the greylist.",
|
||||
"id": "greylist-asn",
|
||||
"label": "Greylist ASN",
|
||||
"regex": "^.*$",
|
||||
"type": "text"
|
||||
},
|
||||
"GREYLIST_ASN_URLS": {
|
||||
"context": "global",
|
||||
"default": "",
|
||||
"help": "List of URLs, separated with spaces, containing ASN to put into the greylist.",
|
||||
"id": "greylist-rdns-urls",
|
||||
"label": "Greylist ASN URLs",
|
||||
"regex": "^.*$",
|
||||
"type": "text"
|
||||
},
|
||||
"GREYLIST_USER_AGENT": {
|
||||
"context": "multisite",
|
||||
"default": "",
|
||||
"help": "List of User-Agent, separated with spaces, to put into the greylist.",
|
||||
"id": "greylist-user-agent",
|
||||
"label": "Greylist User-Agent",
|
||||
"regex": "^.*$",
|
||||
"type": "text"
|
||||
},
|
||||
"GREYLIST_USER_AGENT_URLS": {
|
||||
"context": "global",
|
||||
"default": "",
|
||||
"help": "List of URLs, separated with spaces, containing good User-Agent to put into the greylist.",
|
||||
"id": "greylist-user-agent-urls",
|
||||
"label": "Greylist User-Agent URLs",
|
||||
"regex": "^.*$",
|
||||
"type": "text"
|
||||
},
|
||||
"GREYLIST_URI": {
|
||||
"context": "multisite",
|
||||
"default": "",
|
||||
"help": "List of URI, separated with spaces, to put into the greylist.",
|
||||
"id": "greylist-uri",
|
||||
"label": "Greylist URI",
|
||||
"regex": "^.*$",
|
||||
"type": "text"
|
||||
},
|
||||
"GREYLIST_URI_URLS": {
|
||||
"context": "global",
|
||||
"default": "",
|
||||
"help": "List of URLs, separated with spaces, containing bad URI to put into the greylist.",
|
||||
"id": "greylist-uri-urls",
|
||||
"label": "Greylist URI URLs",
|
||||
"regex": "^.*$",
|
||||
"type": "text"
|
||||
}
|
||||
},
|
||||
"jobs": [{
|
||||
"name": "greylist-download",
|
||||
"file": "greylist-download.py",
|
||||
"every": "hour",
|
||||
"reload": true
|
||||
}]
|
||||
}
|
||||
|
|
@ -204,11 +204,11 @@ Here is the list of related settings :
|
|||
| `ANTIBOT_HCAPTCHA_SECRET` and `ANTIBOT_RECAPTCHA_SECRET` | | The Secret value to use when `USE_ANTIBOT` is set to `hcaptcha` or `recaptcha`. |
|
||||
| `ANTIBOT_RECAPTCHA_SCORE` | `0.7` | The minimum score that clients must have when `USE_ANTIBOT` is set to `recaptcha`. |
|
||||
|
||||
## Blacklisting and whitelisting
|
||||
## Blacklisting, whitelisting and greylisting
|
||||
|
||||
The blacklisting security feature is very easy to understand : if a specific criteria is met, the client will be banned. As for the whitelisting, it's the exact opposite : if a specific criteria is met, the client will be allowed and no additional security check will be done.
|
||||
The blacklisting security feature is very easy to understand : if a specific criteria is met, the client will be banned. As for the whitelisting, it's the exact opposite : if a specific criteria is met, the client will be allowed and no additional security check will be done. Whereas for the greylisting : if a specific criteria is met, the client will be allowed but additional security checks will be done.
|
||||
|
||||
You can configure blacklisting and whitelisting at the same time. If that's the case, note that whitelisting is executed before blacklisting : if a criteria is true for both, the client will be whitelisted.
|
||||
You can configure blacklisting, whitelisting and greylisting at the same time. If that's the case, note that whitelisting is executed before blacklisting and greylisting : even if a criteria is true for all of them, the client will be whitelisted.
|
||||
|
||||
### Blacklisting
|
||||
|
||||
|
|
@ -228,13 +228,31 @@ You can use the following settings to setup blacklisting :
|
|||
| `BLACKLIST_URI` | | List of requests URI to blacklist. |
|
||||
| `BLACKLIST_URI_URLS` | | List of URLs containing request URI to blacklist. |
|
||||
|
||||
### Greylisting
|
||||
|
||||
You can use the following settings to setup greylisting :
|
||||
|
||||
| Setting | Default | Description |
|
||||
| :-------------------------: | :----------------------------------------------------------------------------------------------------------------------------: | :-------------------------------------------------------------------------------------------- |
|
||||
| `USE_GREYLIST` | `no` | When set to `yes`, will enable greylisting based on various criteria. |
|
||||
| `GREYLIST_IP` | | List of IPs and networks to greylist. |
|
||||
| `GREYLIST_IP_URLS` | | List of URL containing IP and network to greylist. |
|
||||
| `GREYLIST_RDNS` | | List of reverse DNS to greylist. |
|
||||
| `GREYLIST_RDNS_URLS` | | List of URLs containing reverse DNS to greylist. |
|
||||
| `GREYLIST_ASN` | | List of ASN to greylist. |
|
||||
| `GREYLIST_ASN_URLS` | | List of URLs containing ASN to greylist. |
|
||||
| `GREYLIST_USER_AGENT` | | List of User-Agents to greylist. |
|
||||
| `GREYLIST_USER_AGENT_URLS` | | List of URLs containing User-Agent(s) to greylist. |
|
||||
| `GREYLIST_URI` | | List of requests URI to greylist. |
|
||||
| `GREYLIST_URI_URLS` | | List of URLs containing request URI to greylist. |
|
||||
|
||||
### Whitelisting
|
||||
|
||||
You can use the following settings to setup whitelisting :
|
||||
|
||||
| Setting | Default | Description |
|
||||
| :-------------------------: | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------: | :----------------------------------------------------------------------------------------------------------------------- |
|
||||
| `USE_WHITELIST` | `yes` | When set to `yes`, will enable blacklisting based on various criteria. |
|
||||
| `USE_WHITELIST` | `yes` | When set to `yes`, will enable whitelisting based on various criteria. |
|
||||
| `WHITELIST_IP` | `20.191.45.212 40.88.21.235 40.76.173.151 40.76.163.7 20.185.79.47 52.142.26.175 20.185.79.15 52.142.24.149 40.76.162.208 40.76.163.23 40.76.162.191 40.76.162.247 54.208.102.37 107.21.1.8` | List of IP and network to whitelist. The default list contains IP from DuckDuckGo crawler. |
|
||||
| `WHITELIST_IP_URLS` | `` | List of URLs containing IP and network to whitelist. |
|
||||
| `WHITELIST_RDNS` | `.google.com .googlebot.com .yandex.ru .yandex.net .yandex.com .search.msn.com .baidu.com .baidu.jp .crawl.yahoo.net .fwd.linkedin.com .twitter.com .twttr.com .discord.com` | List of reverse DNS to whitelist. Default list contains various reverse DNS of search engines and social media crawlers. |
|
||||
|
|
|
|||
Loading…
Reference in New Issue