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--[[
Copyright (c) 2011-2015, Vsevolod Stakhov <vsevolod@highsecure.ru>
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
]]--
-- IP score is a module that set ip score of specific ip and
-- Default settings
local default_port = 6379
local upstreams = nil
local metric = 'default'
local reject_score = 3
local add_header_score = 1
local no_action_score = -2
local symbol = 'IP_SCORE'
local prefix = 'ip_score:'
-- This score is used for normalization of scores from keystorage
local normalize_score = 100
local whitelist = nil
local expire = 240
local rspamd_logger = require "rspamd_logger"
local rspamd_redis = require "rspamd_redis"
local upstream_list = require "rspamd_upstream_list"
local _ = require "fun"
-- Set score based on metric's action
local ip_score_set = function(task)
-- Callback generator
local make_key_cb = function(ip)
local cb = function(task, err, data)
if err then
rspamd_logger.info('got error while IP score changing: ' .. err)
end
end
return cb
end
local function process_action(ip, score)
local cmd = 'INCRBY'
local args = {}
table.insert(args, prefix .. ip:to_string())
if score > 0 then
table.insert(args, score)
else
cmd = 'DECRBY'
table.insert(args, -score)
end
return cmd, args
end
local action = task:get_metric_action(metric)
local ip = task:get_from_ip()
if not ip or not ip:is_valid() then
return
end
-- Check whitelist
if whitelist then
if whitelist:get_key(ip) then
-- Address is whitelisted
return
end
end
local cmd, args
if action then
local cb = make_key_cb(ip)
-- Now check action
if action == 'reject' then
cmd, args = process_action(ip, reject_score)
elseif action == 'add header' then
cmd, args = process_action(ip, add_header_score)
elseif action == 'no action' then
cmd, args = process_action(ip, no_action_score)
end
end
if cmd then
local upstream = upstreams:get_upstream_by_hash(ip:to_string())
local addr = upstream:get_addr()
rspamd_redis.make_request(task, addr, make_key_cb(ip), cmd, args)
end
end
-- Check score for ip in keystorage
local ip_score_check = function(task)
local cb = function(task, err, data)
if err then
-- Key is not found or error occurred
return
elseif data then
local score = tonumber(data)
if not score then
return
end
-- Normalize
if score > 0 and score > normalize_score then
score = 1
elseif score < 0 and score < -normalize_score then
score = -1
else
score = score / normalize_score
end
task:insert_result(symbol, score)
end
end
local ip = task:get_from_ip()
if ip:is_valid() then
if whitelist then
if whitelist:get_key(task:get_from_ip()) then
-- Address is whitelisted
return
end
end
local upstream = upstreams:get_upstream_by_hash(ip:to_string())
local addr = upstream:get_addr()
rspamd_redis.make_request(task, addr, cb, 'GET', {prefix .. ip:to_string()})
end
end
-- Configuration options
local configure_ip_score_module = function()
local opts = rspamd_config:get_all_opt('ip_score')
if opts then
if opts['metric'] then
metric = opts['metric']
end
if opts['reject_score'] then
reject_score = opts['reject_score']
end
if opts['add_header_score'] then
add_header_score = opts['add_header_score']
end
if opts['no_action_score'] then
no_action_score = opts['no_action_score']
end
if opts['symbol'] then
symbol = opts['symbol']
end
if opts['normalize_score'] then
normalize_score = opts['normalize_score']
end
if opts['threshold'] then
normalize_score = opts['normalize_score']
end
if opts['whitelist'] then
whitelist = rspamd_config:add_radix_map(opts['whitelist'])
end
if opts['expire'] then
expire = opts['expire']
end
if opts['prefix'] then
prefix = opts['prefix']
end
end
if opts['servers'] then
upstreams = upstream_list.create(opts['servers'], default_port)
if not upstreams then
rspamd_logger.err('no servers are specified')
end
end
end
-- Registration
if rspamd_config:get_api_version() >= 9 then
rspamd_config:register_module_option('ip_score', 'keystorage_host', 'string')
rspamd_config:register_module_option('ip_score', 'keystorage_port', 'uint')
rspamd_config:register_module_option('ip_score', 'metric', 'string')
rspamd_config:register_module_option('ip_score', 'reject_score', 'int')
rspamd_config:register_module_option('ip_score', 'add_header_score', 'int')
rspamd_config:register_module_option('ip_score', 'no_action_score', 'int')
rspamd_config:register_module_option('ip_score', 'symbol', 'string')
rspamd_config:register_module_option('ip_score', 'normalize_score', 'uint')
rspamd_config:register_module_option('ip_score', 'whitelist', 'map')
rspamd_config:register_module_option('ip_score', 'expire', 'uint')
configure_ip_score_module()
if upstreams and normalize_score > 0 then
-- Register ip_score module
rspamd_config:register_symbol(symbol, 1.0, ip_score_check)
rspamd_config:register_post_filter(ip_score_set)
end
else
rspamd_logger.err('cannot register module ip_score as it requires at least 9 version of lua API and rspamd >= 0.4.6')
end
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