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-- IP score is a module that set ip score of specific ip and
-- Default settings
local keystorage_host = nil
local keystorage_port = 0
local metric = 'default'
local reject_score = 3
local add_header_score = 1
local no_action_score = -2
local symbol = 'IP_SCORE'
-- This score is used for normalization of scores from keystorage
local normalize_score = 100
local whitelist = nil
local expire = 240
-- 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
if string.find(err, 'not found') then
-- Try to set this key
local cb_set = function(task, err, data)
if err then
if err ~= 'OK' then
rspamd_logger.info('got error: ' .. err)
end
end
end
rspamd_redis.make_request(task, keystorage_host, keystorage_port, cb_set, 'SET %b %b %b', ip, expire, '0')
else
rspamd_logger.info('got error while incrementing: ' .. err)
end
end
end
return cb
end
local action = task:get_metric_action(metric)
if action then
-- Check whitelist
if whitelist then
local ipnum = task:get_from_ip_num()
if ipnum and whitelist:get_key(ipnum) then
-- Address is whitelisted
return
end
end
-- Now check action
if action == 'reject' then
local ip = task:get_from_ip()
if ip then
local cb = make_key_cb(ip)
if reject_score > 0 then
rspamd_redis.make_request(task, keystorage_host, keystorage_port, cb, 'INCRBY %b %b', ip, reject_score)
else
rspamd_redis.make_request(task, keystorage_host, keystorage_port, cb, 'DECRBY %b %b', ip, -reject_score)
end
end
elseif action == 'add header' then
local ip = task:get_from_ip()
if ip then
local cb = make_key_cb(ip)
if add_header_score > 0 then
rspamd_redis.make_request(task, keystorage_host, keystorage_port, cb, 'INCRBY %b %b', ip, add_header_score)
else
rspamd_redis.make_request(task, keystorage_host, keystorage_port, cb, 'DECRBY %b %b', ip, -add_header_score)
end
end
elseif action == 'no action' then
local ip = task:get_from_ip()
if ip then
local cb = make_key_cb(ip)
if no_action_score > 0 then
rspamd_redis.make_request(task, keystorage_host, keystorage_port, cb, 'INCRBY %b %b', ip, no_action_score)
else
rspamd_redis.make_request(task, keystorage_host, keystorage_port, cb, 'DECRBY %b %b', ip, -no_action_score)
end
end
end
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 occured
return
elseif data then
local score = tonumber(data)
-- 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 then
if whitelist then
local ipnum = task:get_from_ip_num()
if whitelist:get_key(ipnum) then
-- Address is whitelisted
return
end
end
rspamd_redis.make_request(task, keystorage_host, keystorage_port, cb, 'GET %b', ip)
end
end
-- Configuration options
local configure_ip_score_module = function()
local opts = rspamd_config:get_all_opt('ip_score')
if opts then
if opts['keystorage_host'] then
keystorage_host = opts['keystorage_host']
end
if opts['keystorage_port'] then
keystorage_port = opts['keystorage_port']
end
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['whitelist'] then
whitelist = rspamd_config:add_radix_map(opts['whitelist'])
end
if opts['expire'] then
expire = opts['expire']
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 keystorage_host and keystorage_port 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 requres at least 9 version of lua API and rspamd >= 0.4.6')
end
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