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- --[[
- Copyright (c) 2011-2017, Vsevolod Stakhov <vsevolod@highsecure.ru>
- Copyright (c) 2016-2017, Andrew Lewis <nerf@judo.za.org>
-
- Licensed under the Apache License, Version 2.0 (the "License");
- you may not use this file except in compliance with the License.
- You may obtain a copy of the License at
-
- http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
- ]]--
-
- if confighelp then
- return
- end
-
- -- A plugin that implements ratelimits using redis
-
- local E, settings = {}, {}
- local N = 'ratelimit'
- -- Senders that are considered as bounce
- local bounce_senders = {'postmaster', 'mailer-daemon', '', 'null', 'fetchmail-daemon', 'mdaemon'}
- -- Do not check ratelimits for these recipients
- local whitelisted_rcpts = {'postmaster', 'mailer-daemon'}
- local whitelisted_ip
- local whitelisted_user
- local max_rcpt = 5
- local redis_params
- local ratelimit_symbol
- -- Do not delay mail after 1 day
- local use_ip_score = false
- local rl_prefix = 'RL'
- local ip_score_lower_bound = 10
- local ip_score_ham_multiplier = 1.1
- local ip_score_spam_divisor = 1.1
- local limits_hash
-
- local message_func = function(_, limit_type)
- return string.format('Ratelimit "%s" exceeded', limit_type)
- end
-
- local rspamd_logger = require "rspamd_logger"
- local rspamd_util = require "rspamd_util"
- local rspamd_lua_utils = require "lua_util"
- local lua_redis = require "lua_redis"
- local fun = require "fun"
-
- local user_keywords = {'user'}
-
- local redis_script_sha
- local redis_script = [[local bucket
- local limited = false
- local buckets = {}
- local queue_id = table.remove(ARGV)
- local now = table.remove(ARGV)
-
- local argi = 0
- for i = 1, #KEYS do
- local key = KEYS[i]
- local period = tonumber(ARGV[argi+1])
- local limit = tonumber(ARGV[argi+2])
- if not buckets[key] then
- buckets[key] = {
- max_period = period,
- limits = { {period, limit} },
- }
- else
- table.insert(buckets[key].limits, {period, limit})
- if period > buckets[key].max_period then
- buckets[key].max_period = period
- end
- end
- argi = argi + 2
- end
-
- for k, v in pairs(buckets) do
- local maxp = v.max_period
- redis.call('ZREMRANGEBYSCORE', k, '-inf', now - maxp)
- for _, lim in ipairs(v.limits) do
- local period = lim[1]
- local limit = lim[2]
- local rate
- if period == maxp then
- rate = redis.call('ZCARD', k)
- else
- rate = redis.call('ZCOUNT', k, now - period, '+inf')
- end
- if rate and rate >= limit then
- limited = true
- bucket = k
- end
- end
- redis.call('EXPIRE', k, maxp)
- if limited then break end
- end
-
- if not limited then
- for k in pairs(buckets) do
- redis.call('ZADD', k, now, queue_id)
- end
- end
-
- return {limited, bucket}]]
-
- local redis_script_symbol = [[local limited = false
- local buckets, results = {}, {}
- local queue_id = table.remove(ARGV)
- local now = table.remove(ARGV)
-
- local argi = 0
- for i = 1, #KEYS do
- local key = KEYS[i]
- local period = tonumber(ARGV[argi+1])
- local limit = tonumber(ARGV[argi+2])
- if not buckets[key] then
- buckets[key] = {
- max_period = period,
- limits = { {period, limit} },
- }
- else
- table.insert(buckets[key].limits, {period, limit})
- if period > buckets[key].max_period then
- buckets[key].max_period = period
- end
- end
- argi = argi + 2
- end
-
- for k, v in pairs(buckets) do
- local maxp = v.max_period
- redis.call('ZREMRANGEBYSCORE', k, '-inf', now - maxp)
- for _, lim in ipairs(v.limits) do
- local period = lim[1]
- local limit = lim[2]
- local rate
- if period == maxp then
- rate = redis.call('ZCARD', k)
- else
- rate = redis.call('ZCOUNT', k, now - period, '+inf')
- end
- if rate then
- local mult = 2 * math.tanh(rate / (limit * 2))
- if mult >= 0.5 then
- table.insert(results, {k, tostring(mult)})
- end
- end
- end
- redis.call('ZADD', k, now, queue_id)
- redis.call('EXPIRE', k, maxp)
- end
-
- return results]]
-
- local function load_scripts(cfg, ev_base)
- local function rl_script_cb(err, data)
- if err then
- rspamd_logger.errx(cfg, 'Script loading failed: ' .. err)
- elseif type(data) == 'string' then
- redis_script_sha = data
- end
- end
- local script
- if ratelimit_symbol then
- script = redis_script_symbol
- else
- script = redis_script
- end
- lua_redis.redis_make_request_taskless(
- ev_base,
- cfg,
- redis_params,
- nil, -- key
- true, -- is write
- rl_script_cb, --callback
- 'SCRIPT', -- command
- {'LOAD', script}
- )
- end
-
- local limit_parser
- local function parse_string_limit(lim, no_error)
- local function parse_time_suffix(s)
- if s == 's' then
- return 1
- elseif s == 'm' then
- return 60
- elseif s == 'h' then
- return 3600
- elseif s == 'd' then
- return 86400
- end
- end
- local function parse_num_suffix(s)
- if s == '' then
- return 1
- elseif s == 'k' then
- return 1000
- elseif s == 'm' then
- return 1000000
- elseif s == 'g' then
- return 1000000000
- end
- end
- local lpeg = require "lpeg"
-
- if not limit_parser then
- local digit = lpeg.R("09")
- limit_parser = {}
- limit_parser.integer =
- (lpeg.S("+-") ^ -1) *
- (digit ^ 1)
- limit_parser.fractional =
- (lpeg.P(".") ) *
- (digit ^ 1)
- limit_parser.number =
- (limit_parser.integer *
- (limit_parser.fractional ^ -1)) +
- (lpeg.S("+-") * limit_parser.fractional)
- limit_parser.time = lpeg.Cf(lpeg.Cc(1) *
- (limit_parser.number / tonumber) *
- ((lpeg.S("smhd") / parse_time_suffix) ^ -1),
- function (acc, val) return acc * val end)
- limit_parser.suffixed_number = lpeg.Cf(lpeg.Cc(1) *
- (limit_parser.number / tonumber) *
- ((lpeg.S("kmg") / parse_num_suffix) ^ -1),
- function (acc, val) return acc * val end)
- limit_parser.limit = lpeg.Ct(limit_parser.suffixed_number *
- (lpeg.S(" ") ^ 0) * lpeg.S("/") * (lpeg.S(" ") ^ 0) *
- limit_parser.time)
- end
- local t = lpeg.match(limit_parser.limit, lim)
-
- if t and t[1] and t[2] and t[2] ~= 0 then
- return t[2], t[1]
- end
-
- if not no_error then
- rspamd_logger.errx(rspamd_config, 'bad limit: %s', lim)
- end
-
- return nil
- end
-
- local function resize_element(x_score, x_total, element)
- local x_ip_score
- if not x_total then x_total = 0 end
- if x_total < ip_score_lower_bound or x_total <= 0 then
- x_score = 1
- else
- x_score = x_score / x_total
- end
- if x_score > 0 then
- x_ip_score = x_score / ip_score_spam_divisor
- element = element * rspamd_util.tanh(2.718281 * x_ip_score)
- elseif x_score < 0 then
- x_ip_score = ((1 + (x_score * -1)) * ip_score_ham_multiplier)
- element = element * x_ip_score
- end
- return element
- end
-
- --- Check whether this addr is bounce
- local function check_bounce(from)
- return fun.any(function(b) return b == from end, bounce_senders)
- end
-
- local custom_keywords = {}
-
- local keywords = {
- ['ip'] = {
- ['get_value'] = function(task)
- local ip = task:get_ip()
- if ip and ip:is_valid() then return ip end
- return nil
- end,
- },
- ['rip'] = {
- ['get_value'] = function(task)
- local ip = task:get_ip()
- if ip and ip:is_valid() and not ip:is_local() then return ip end
- return nil
- end,
- },
- ['from'] = {
- ['get_value'] = function(task)
- local from = task:get_from(0)
- if ((from or E)[1] or E).addr then
- return string.lower(from[1]['addr'])
- end
- return nil
- end,
- },
- ['bounce'] = {
- ['get_value'] = function(task)
- local from = task:get_from(0)
- if not ((from or E)[1] or E).user then
- return '_'
- end
- if check_bounce(from[1]['user']) then return '_' else return nil end
- end,
- },
- ['asn'] = {
- ['get_value'] = function(task)
- local asn = task:get_mempool():get_variable('asn')
- if not asn then
- return nil
- else
- return asn
- end
- end,
- },
- ['user'] = {
- ['get_value'] = function(task)
- local auser = task:get_user()
- if not auser then
- return nil
- else
- return auser
- end
- end,
- },
- ['to'] = {
- ['get_value'] = function()
- return '%s' -- 'to' is special
- end,
- },
- }
-
- local function dynamic_rate_key(task, rtype)
- local key_t = {rl_prefix, rtype}
- local key_keywords = rspamd_str_split(rtype, '_')
- local have_to, have_user = false, false
- for _, v in ipairs(key_keywords) do
- if (custom_keywords[v] and type(custom_keywords[v]['condition']) == 'function') then
- if not custom_keywords[v]['condition']() then return nil end
- end
- local ret
- if custom_keywords[v] and type(custom_keywords[v]['get_value']) == 'function' then
- ret = custom_keywords[v]['get_value'](task)
- elseif keywords[v] and type(keywords[v]['get_value']) == 'function' then
- ret = keywords[v]['get_value'](task)
- end
- if not ret then return nil end
- for _, uk in ipairs(user_keywords) do
- if v == uk then have_user = true end
- if have_user then break end
- end
- if v == 'to' then have_to = true end
- if type(ret) ~= 'string' then ret = tostring(ret) end
- table.insert(key_t, ret)
- end
- if (not have_user) and task:get_user() then
- return nil
- end
- if not have_to then
- return table.concat(key_t, ":")
- else
- local rate_keys = {}
- local rcpts = task:get_recipients(0)
- if not ((rcpts or E)[1] or E).addr then
- return nil
- end
- local key_s = table.concat(key_t, ":")
- local total_rcpt = 0
- for _, r in ipairs(rcpts) do
- if r['addr'] and total_rcpt < max_rcpt then
- local key_f = string.format(key_s, string.lower(r['addr']))
- table.insert(rate_keys, key_f)
- total_rcpt = total_rcpt + 1
- end
- end
- return rate_keys
- end
- end
-
- local function process_buckets(task, buckets)
- if not buckets then return end
- local function rl_redis_cb(err, data)
- if err then
- rspamd_logger.infox(task, 'got error while setting limit: %1', err)
- end
- if not data then return end
- if data[1] == 1 then
- rspamd_logger.infox(task,
- 'ratelimit "%s" exceeded',
- data[2])
- task:set_pre_result('soft reject',
- message_func(task, data[2]))
- end
- end
- local function rl_symbol_redis_cb(err, data)
- if err then
- rspamd_logger.infox(task, 'got error while setting limit: %1', err)
- end
- if not data then return end
- for i, b in ipairs(data) do
- task:insert_result(ratelimit_symbol, b[2], string.format('%s:%s:%s', i, b[1], b[2]))
- end
- end
- local redis_cb = rl_redis_cb
- if ratelimit_symbol then redis_cb = rl_symbol_redis_cb end
- local args = {redis_script_sha, #buckets}
- for _, bucket in ipairs(buckets) do
- table.insert(args, bucket[2])
- end
- for _, bucket in ipairs(buckets) do
- if use_ip_score then
- local asn_score,total_asn,
- country_score,total_country,
- ipnet_score,total_ipnet,
- ip_score, total_ip = task:get_mempool():get_variable('ip_score',
- 'double,double,double,double,double,double,double,double')
- local key_keywords = rspamd_str_split(bucket[2], '_')
- local has_asn, has_ip = false, false
- for _, v in ipairs(key_keywords) do
- if v == "asn" then has_asn = true end
- if v == "ip" then has_ip = true end
- if has_ip and has_asn then break end
- end
- if has_asn and not has_ip then
- bucket[1][2] = resize_element(asn_score, total_asn, bucket[1][2])
- elseif has_ip then
- if total_ip and total_ip > ip_score_lower_bound then
- bucket[1][2] = resize_element(ip_score, total_ip, bucket[1][2])
- elseif total_ipnet and total_ipnet > ip_score_lower_bound then
- bucket[1][2] = resize_element(ipnet_score, total_ipnet, bucket[1][2])
- elseif total_asn and total_asn > ip_score_lower_bound then
- bucket[1][2] = resize_element(asn_score, total_asn, bucket[1][2])
- elseif total_country and total_country > ip_score_lower_bound then
- bucket[1][2] = resize_element(country_score, total_country, bucket[1][2])
- else
- bucket[1][2] = resize_element(ip_score, total_ip, bucket[1][2])
- end
- end
- end
- table.insert(args, bucket[1][1])
- table.insert(args, bucket[1][2])
- end
- table.insert(args, rspamd_util.get_time())
- table.insert(args, task:get_queue_id() or task:get_uid())
- local ret = rspamd_redis_make_request(task,
- redis_params, -- connect params
- nil, -- hash key
- true, -- is write
- redis_cb, --callback
- 'evalsha', -- command
- args -- arguments
- )
- if not ret then
- rspamd_logger.errx(task, 'got error connecting to redis')
- end
- end
-
- local function ratelimit_cb(task)
- if rspamd_lua_utils.is_rspamc_or_controller(task) then return end
- local args = {}
- -- Get initial task data
- local ip = task:get_from_ip()
- if ip and ip:is_valid() and whitelisted_ip then
- if whitelisted_ip:get_key(ip) then
- -- Do not check whitelisted ip
- rspamd_logger.infox(task, 'skip ratelimit for whitelisted IP')
- return
- end
- end
- -- Parse all rcpts
- local rcpts = task:get_recipients()
- local rcpts_user = {}
- if rcpts then
- fun.each(function(r)
- fun.each(function(type) table.insert(rcpts_user, r[type]) end, {'user', 'addr'})
- end, rcpts)
- if fun.any(
- function(r)
- if fun.any(function(w) return r == w end, whitelisted_rcpts) then return true end
- end,
- rcpts_user) then
-
- rspamd_logger.infox(task, 'skip ratelimit for whitelisted recipient')
- return
- end
- end
- -- Get user (authuser)
- if whitelisted_user then
- local auser = task:get_user()
- if whitelisted_user:get_key(auser) then
- rspamd_logger.infox(task, 'skip ratelimit for whitelisted user')
- return
- end
- end
-
- local redis_keys = {}
- local redis_keys_rev = {}
- local function collect_redis_keys()
- local function collect_cb(err, data)
- if err then
- rspamd_logger.errx(task, 'redis error: %1', err)
- else
- for i, d in ipairs(data) do
- if type(d) == 'string' then
- local plim, size = parse_string_limit(d)
- if plim then
- table.insert(args, {{plim, size}, redis_keys_rev[i]})
- end
- end
- end
- return process_buckets(task, args)
- end
- end
- local params, method
- if limits_hash then
- params = {limits_hash, rspamd_lua_utils.unpack(redis_keys)}
- method = 'HMGET'
- else
- method = 'MGET'
- params = redis_keys
- end
- local requested_keys = rspamd_redis_make_request(task,
- redis_params, -- connect params
- nil, -- hash key
- true, -- is write
- collect_cb, --callback
- method, -- command
- params -- arguments
- )
- if not requested_keys then
- rspamd_logger.errx(task, 'got error connecting to redis')
- return process_buckets(task, args)
- end
- end
-
- local rate_key
- for k in pairs(settings) do
- rate_key = dynamic_rate_key(task, k)
- if rate_key then
- if type(rate_key) == 'table' then
- for _, rk in ipairs(rate_key) do
- if type(settings[k]) == 'string' and
- (custom_keywords[settings[k]] and type(custom_keywords[settings[k]]['get_limit']) == 'function') then
- local res = custom_keywords[settings[k]]['get_limit'](task)
- if type(res) == 'string' then res = {res} end
- for _, r in ipairs(res) do
- local plim, size = parse_string_limit(r, true)
- if plim then
- table.insert(args, {{plim, size}, rk})
- else
- local rkey = string.match(settings[k], 'redis:(.*)')
- if rkey then
- table.insert(redis_keys, rkey)
- redis_keys_rev[#redis_keys] = rk
- else
- rspamd_logger.infox(task, "Don't know what to do with limit: %1", settings[k])
- end
- end
- end
- end
- end
- else
- if type(settings[k]) == 'string' and
- (custom_keywords[settings[k]] and type(custom_keywords[settings[k]]['get_limit']) == 'function') then
- local res = custom_keywords[settings[k]]['get_limit'](task)
- if type(res) == 'string' then res = {res} end
- for _, r in ipairs(res) do
- local plim, size = parse_string_limit(r, true)
- if plim then
- table.insert(args, {{plim, size}, rate_key})
- else
- local rkey = string.match(r, 'redis:(.*)')
- if rkey then
- table.insert(redis_keys, rkey)
- redis_keys_rev[#redis_keys] = rate_key
- else
- rspamd_logger.infox(task, "Don't know what to do with limit: %1", settings[k])
- end
- end
- end
- elseif type(settings[k]) == 'table' then
- for _, rl in ipairs(settings[k]) do
- table.insert(args, {{rl[1], rl[2]}, rate_key})
- end
- elseif type(settings[k]) == 'string' then
- local rkey = string.match(settings[k], 'redis:(.*)')
- if rkey then
- table.insert(redis_keys, rkey)
- redis_keys_rev[#redis_keys] = rate_key
- else
- rspamd_logger.infox(task, "Don't know what to do with limit: %1", settings[k])
- end
- end
- end
- end
- end
-
- if redis_keys[1] then
- return collect_redis_keys()
- else
- return process_buckets(task, args)
- end
- end
-
- local opts = rspamd_config:get_all_opt(N)
- if opts then
- if opts['limit'] then
- rspamd_logger.errx(rspamd_config, 'Legacy ratelimit config format no longer supported')
- end
-
- if opts['rates'] and type(opts['rates']) == 'table' then
- -- new way of setting limits
- fun.each(function(t, lim)
- if type(lim) == 'table' then
- settings[t] = {}
- fun.each(function(l)
- local plim, size = parse_string_limit(l)
- if plim then
- table.insert(settings[t], {plim, size})
- end
- end, lim)
- elseif type(lim) == 'string' then
- local plim, size = parse_string_limit(lim)
- if plim then
- settings[t] = { {plim, size} }
- end
- end
- end, opts['rates'])
- end
-
- if opts['dynamic_rates'] and type(opts['dynamic_rates']) == 'table' then
- fun.each(function(t, lim)
- if type(lim) == 'string' then
- settings[t] = lim
- end
- end, opts['dynamic_rates'])
- end
-
- local enabled_limits = fun.totable(fun.map(function(t)
- return t
- end, settings))
- rspamd_logger.infox(rspamd_config, 'enabled rate buckets: [%1]', table.concat(enabled_limits, ','))
-
- if opts['whitelisted_rcpts'] and type(opts['whitelisted_rcpts']) == 'string' then
- whitelisted_rcpts = rspamd_str_split(opts['whitelisted_rcpts'], ',')
- elseif type(opts['whitelisted_rcpts']) == 'table' then
- whitelisted_rcpts = opts['whitelisted_rcpts']
- end
-
- if opts['whitelisted_ip'] then
- whitelisted_ip = rspamd_map_add('ratelimit', 'whitelisted_ip', 'radix',
- 'Ratelimit whitelist ip map')
- end
-
- if opts['whitelisted_user'] then
- whitelisted_user = rspamd_map_add('ratelimit', 'whitelisted_user', 'set',
- 'Ratelimit whitelist user map')
- end
-
- if opts['symbol'] then
- -- We want symbol instead of pre-result
- ratelimit_symbol = opts['symbol']
- end
-
- if opts['max_rcpt'] then
- max_rcpt = tonumber(opts['max_rcpt'])
- end
-
- if opts['use_ip_score'] then
- use_ip_score = true
- local ip_score_opts = rspamd_config:get_all_opt('ip_score')
- if ip_score_opts and ip_score_opts['lower_bound'] then
- ip_score_lower_bound = ip_score_opts['lower_bound']
- end
- end
-
- if opts['custom_keywords'] then
- custom_keywords = dofile(opts['custom_keywords'])
- end
-
- if opts['user_keywords'] then
- user_keywords = opts['user_keywords']
- end
-
- if opts['message_func'] then
- message_func = assert(load(opts['message_func']))()
- end
-
- if opts['limits_hash'] then
- limits_hash = opts['limits_hash']
- end
-
- redis_params = rspamd_parse_redis_server('ratelimit')
- if not redis_params then
- rspamd_logger.infox(rspamd_config, 'no servers are specified, disabling module')
- else
- local s = {
- type = 'prefilter,nostat',
- name = 'RATELIMIT_CHECK',
- priority = 4,
- callback = ratelimit_cb,
- }
- if use_ip_score then
- s.type = 'normal'
- end
- if ratelimit_symbol then
- s.name = ratelimit_symbol
- end
- local id = rspamd_config:register_symbol(s)
- if use_ip_score then
- rspamd_config:register_dependency(id, 'IP_SCORE')
- end
- for _, v in pairs(custom_keywords) do
- if type(v) == 'table' and type(v['init']) == 'function' then
- v['init']()
- end
- end
- end
- end
- rspamd_config:add_on_load(function(cfg, ev_base, worker)
- load_scripts(cfg, ev_base)
- end)
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