[Rspamd] Initial custom ratelimit support
andryyy
parent
4e148c7026
commit
5f5872f78b
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@ -19,6 +19,7 @@ RUN apt-get update && apt-get install -y \
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&& chown _rspamd:_rspamd /run/rspamd
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COPY settings.conf /etc/rspamd/modules.d/settings.conf
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COPY ratelimit.lua /usr/share/rspamd/lua/ratelimit.lua
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COPY docker-entrypoint.sh /docker-entrypoint.sh
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ENTRYPOINT ["/docker-entrypoint.sh"]
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@ -0,0 +1,717 @@
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--[[
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Copyright (c) 2011-2015, Vsevolod Stakhov <vsevolod@highsecure.ru>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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]]--
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if confighelp then
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return
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end
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-- A plugin that implements ratelimits using redis or kvstorage server
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local E = {}
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-- Default settings for limits, 1-st member is burst, second is rate and the third is numeric type
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local settings = {
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}
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-- Senders that are considered as bounce
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local bounce_senders = {'postmaster', 'mailer-daemon', '', 'null', 'fetchmail-daemon', 'mdaemon'}
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-- Do not check ratelimits for these recipients
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local whitelisted_rcpts = {'postmaster', 'mailer-daemon'}
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local whitelisted_ip
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local whitelisted_user
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local max_rcpt = 5
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local redis_params
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local ratelimit_symbol
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-- Do not delay mail after 1 day
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local max_delay = 24 * 3600
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local use_ip_score = false
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local rl_prefix = 'rl'
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local ip_score_lower_bound = 10
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local ip_score_ham_multiplier = 1.1
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local ip_score_spam_divisor = 1.1
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local message_func = function(_, limit_type)
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return string.format('Ratelimit "%s" exceeded', limit_type)
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end
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local rspamd_logger = require "rspamd_logger"
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local rspamd_util = require "rspamd_util"
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local rspamd_lua_utils = require "lua_util"
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local fun = require "fun"
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local user_keywords = {'user'}
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local limit_parser
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local function parse_string_limit(lim)
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local function parse_time_suffix(s)
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if s == 's' then
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return 1
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elseif s == 'm' then
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return 60
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elseif s == 'h' then
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return 3600
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elseif s == 'd' then
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return 86400
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end
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end
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local function parse_num_suffix(s)
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if s == '' then
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return 1
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elseif s == 'k' then
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return 1000
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elseif s == 'm' then
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return 1000000
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elseif s == 'g' then
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return 1000000000
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end
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end
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local lpeg = require "lpeg"
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if not limit_parser then
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local digit = lpeg.R("09")
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limit_parser = {}
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limit_parser.integer =
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(lpeg.S("+-") ^ -1) *
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(digit ^ 1)
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limit_parser.fractional =
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(lpeg.P(".") ) *
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(digit ^ 1)
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limit_parser.number =
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(limit_parser.integer *
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(limit_parser.fractional ^ -1)) +
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(lpeg.S("+-") * limit_parser.fractional)
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limit_parser.time = lpeg.Cf(lpeg.Cc(1) *
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(limit_parser.number / tonumber) *
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((lpeg.S("smhd") / parse_time_suffix) ^ -1),
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function (acc, val) return acc * val end)
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limit_parser.suffixed_number = lpeg.Cf(lpeg.Cc(1) *
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(limit_parser.number / tonumber) *
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((lpeg.S("kmg") / parse_num_suffix) ^ -1),
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function (acc, val) return acc * val end)
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limit_parser.limit = lpeg.Ct(limit_parser.suffixed_number *
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(lpeg.S(" ") ^ 0) * lpeg.S("/") * (lpeg.S(" ") ^ 0) *
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limit_parser.time)
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end
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local t = lpeg.match(limit_parser.limit, lim)
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if t and t[1] and t[2] and t[2] ~= 0 then
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return t[1] / t[2], t[1]
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end
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rspamd_logger.errx(rspamd_config, 'bad limit: %s', lim)
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return nil
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end
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--- Parse atime and bucket of limit
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local function parse_limits(data)
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local function parse_limit_elt(str)
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local elts = rspamd_str_split(str, ':')
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if not elts or #elts < 2 then
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return {0, 0, 0}
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else
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local atime = tonumber(elts[1])
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local bucket = tonumber(elts[2])
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local ctime = atime
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if elts[3] then
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ctime = tonumber(elts[3])
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end
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if not ctime then
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ctime = atime
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end
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return {atime,bucket,ctime}
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end
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end
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return fun.iter(data):map(function(e)
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if type(e) == 'string' then
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return parse_limit_elt(e)
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else
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return {0, 0, 0}
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end
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end):totable()
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end
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local function resize_element(x_score, x_total, element)
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local x_ip_score
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if not x_total then x_total = 0 end
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if x_total < ip_score_lower_bound or x_total <= 0 then
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x_score = 1
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else
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x_score = x_score / x_total
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end
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if x_score > 0 then
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x_ip_score = x_score / ip_score_spam_divisor
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element = element * rspamd_util.tanh(2.718281 * x_ip_score)
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elseif x_score < 0 then
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x_ip_score = ((1 + (x_score * -1)) * ip_score_ham_multiplier)
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element = element * x_ip_score
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end
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return element
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end
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--- Check whether this addr is bounce
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local function check_bounce(from)
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return fun.any(function(b) return b == from end, bounce_senders)
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end
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local custom_keywords = {}
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local keywords = {
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['ip'] = {
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['get_value'] = function(task)
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local ip = task:get_ip()
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if ip and ip:is_valid() then return ip end
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return nil
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end,
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},
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['rip'] = {
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['get_value'] = function(task)
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local ip = task:get_ip()
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if ip and ip:is_valid() and not ip:is_local() then return ip end
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return nil
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end,
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},
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['from'] = {
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['get_value'] = function(task)
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local from = task:get_from(0)
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if ((from or E)[1] or E).addr then
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return from[1]['addr']
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end
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return nil
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end,
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},
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['bounce'] = {
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['get_value'] = function(task)
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local from = task:get_from(0)
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if not ((from or E)[1] or E).user then
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return '_'
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end
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if check_bounce(from[1]['user']) then return '_' else return nil end
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end,
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},
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['asn'] = {
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['get_value'] = function(task)
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local asn = task:get_mempool():get_variable('asn')
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if not asn then
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return nil
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else
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return asn
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end
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end,
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},
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['user'] = {
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['get_value'] = function(task)
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local auser = task:get_user()
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if not auser then
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return nil
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else
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return auser
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end
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end,
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},
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['to'] = {
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['get_value'] = function()
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return '%s' -- 'to' is special
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end,
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},
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}
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local function dynamic_rate_key(task, rtype)
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local key_t = {rl_prefix, rtype}
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local key_keywords = rspamd_str_split(rtype, '_')
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local have_to, have_user = false, false
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for _, v in ipairs(key_keywords) do
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if (custom_keywords[v] and type(custom_keywords[v]['condition']) == 'function') then
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if not custom_keywords[v]['condition']() then return nil end
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end
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local ret
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if custom_keywords[v] and type(custom_keywords[v]['get_value']) == 'function' then
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ret = custom_keywords[v]['get_value'](task)
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elseif keywords[v] and type(keywords[v]['get_value']) == 'function' then
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ret = keywords[v]['get_value'](task)
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end
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if not ret then return nil end
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for _, uk in ipairs(user_keywords) do
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if v == uk then have_user = true end
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if have_user then break end
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end
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if v == 'to' then have_to = true end
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if type(ret) ~= 'string' then ret = tostring(ret) end
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table.insert(key_t, ret)
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end
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if (not have_user) and task:get_user() then
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return nil
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end
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if not have_to then
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return table.concat(key_t, ":")
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else
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local rate_keys = {}
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local rcpts = task:get_recipients(0)
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if not ((rcpts or E)[1] or E).addr then
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return nil
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end
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local key_s = table.concat(key_t, ":")
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local total_rcpt = 0
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for _, r in ipairs(rcpts) do
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if r['addr'] and total_rcpt < max_rcpt then
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local key_f = string.format(key_s, r['addr'])
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table.insert(rate_keys, key_f)
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total_rcpt = total_rcpt + 1
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end
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end
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return rate_keys
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end
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end
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--- Check specific limit inside redis
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local function check_limits(task, args)
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local key = fun.foldl(function(acc, k) return acc .. k[2] end, '', args)
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local ret
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--- Called when value is got from server
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local function rate_get_cb(err, data)
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if err then
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rspamd_logger.infox(task, 'got error while getting limit: %1', err)
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end
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if not data then return end
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local ntime = rspamd_util.get_time()
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local asn_score,total_asn,
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country_score,total_country,
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ipnet_score,total_ipnet,
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ip_score, total_ip
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if use_ip_score then
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asn_score,total_asn,
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country_score,total_country,
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ipnet_score,total_ipnet,
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ip_score, total_ip = task:get_mempool():get_variable('ip_score',
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'double,double,double,double,double,double,double,double')
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end
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fun.each(function(elt, limit, rtype)
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local bucket = elt[2]
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local rate = limit[2]
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local threshold = limit[1]
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local atime = elt[1]
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local ctime = elt[3]
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if atime == 0 then return end
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if use_ip_score then
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local key_keywords = rspamd_str_split(rtype, '_')
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local has_asn, has_ip = false, false
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for _, v in ipairs(key_keywords) do
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if v == "asn" then has_asn = true end
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if v == "ip" then has_ip = true end
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if has_ip and has_asn then break end
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end
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if has_asn and not has_ip then
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bucket = resize_element(asn_score, total_asn, bucket)
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rate = resize_element(asn_score, total_asn, rate)
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elseif has_ip then
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if total_ip and total_ip > ip_score_lower_bound then
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bucket = resize_element(ip_score, total_ip, bucket)
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rate = resize_element(ip_score, total_ip, rate)
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elseif total_ipnet and total_ipnet > ip_score_lower_bound then
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bucket = resize_element(ipnet_score, total_ipnet, bucket)
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rate = resize_element(ipnet_score, total_ipnet, rate)
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elseif total_asn and total_asn > ip_score_lower_bound then
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bucket = resize_element(asn_score, total_asn, bucket)
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rate = resize_element(asn_score, total_asn, rate)
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elseif total_country and total_country > ip_score_lower_bound then
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bucket = resize_element(country_score, total_country, bucket)
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rate = resize_element(country_score, total_country, rate)
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else
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bucket = resize_element(ip_score, total_ip, bucket)
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rate = resize_element(ip_score, total_ip, rate)
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end
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end
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end
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if atime - ctime > max_delay then
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rspamd_logger.infox(task, 'limit is too old: %1 seconds; ignore it',
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atime - ctime)
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else
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bucket = bucket - rate * (ntime - atime);
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if bucket > 0 then
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if ratelimit_symbol then
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local mult = 2 * rspamd_util.tanh(bucket / (threshold * 2))
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if mult > 0.5 then
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task:insert_result(ratelimit_symbol, mult,
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rtype .. ':' .. string.format('%.2f', mult))
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end
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else
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if bucket > threshold then
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rspamd_logger.infox(task,
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'ratelimit "%s" exceeded: %s elements with %s limit',
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rtype, bucket, threshold)
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task:set_pre_result('soft reject',
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message_func(task, rtype, bucket, threshold))
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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, fun.zip(parse_limits(data), fun.map(function(a) return a[1] end, args),
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fun.map(function(a) return rspamd_str_split(a[2], ":")[2] end, args)))
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end
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ret = rspamd_redis_make_request(task,
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redis_params, -- connect params
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key, -- hash key
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false, -- is write
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rate_get_cb, --callback
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'mget', -- command
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fun.totable(fun.map(function(l) return l[2] end, args)) -- arguments
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)
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if not ret then
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rspamd_logger.errx(task, 'got error connecting to redis')
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end
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end
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--- Set specific limit inside redis
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local function set_limits(task, args)
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local key = fun.foldl(function(acc, k) return acc .. k[2] end, '', args)
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local ret, upstream
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local function rate_set_cb(err)
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if err then
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rspamd_logger.infox(task, 'got error %s when setting ratelimit record on server %s',
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err, upstream:get_addr())
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end
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end
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local function rate_get_cb(err, data)
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if err then
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rspamd_logger.infox(task, 'got error while setting limit: %1', err)
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end
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if not data then return end
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local ntime = rspamd_util.get_time()
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local values = {}
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fun.each(function(elt, limit)
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local bucket = elt[2]
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local rate = limit[1][2]
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local atime = elt[1]
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local ctime = elt[3]
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if atime - ctime > max_delay then
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rspamd_logger.infox(task, 'limit is too old: %1 seconds; start it over',
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atime - ctime)
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bucket = 1
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ctime = ntime
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else
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if bucket > 0 then
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bucket = bucket - rate * (ntime - atime) + 1;
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if bucket < 0 then
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bucket = 1
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end
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else
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bucket = 1
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end
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end
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if ctime == 0 then ctime = ntime end
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local lstr = string.format('%.3f:%.3f:%.3f', ntime, bucket, ctime)
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table.insert(values, {limit[2], max_delay, lstr})
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end, fun.zip(parse_limits(data), fun.iter(args)))
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if #values > 0 then
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local conn
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ret,conn,upstream = rspamd_redis_make_request(task,
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redis_params, -- connect params
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key, -- hash key
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true, -- is write
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rate_set_cb, --callback
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'setex', -- command
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values[1] -- arguments
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)
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if conn then
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fun.each(function(v)
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conn:add_cmd('setex', v)
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end, fun.drop_n(1, values))
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else
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rspamd_logger.errx(task, 'got error while connecting to redis')
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end
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end
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end
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local _
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ret,_,upstream = rspamd_redis_make_request(task,
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redis_params, -- connect params
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key, -- hash key
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false, -- is write
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rate_get_cb, --callback
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'mget', -- command
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fun.totable(fun.map(function(l) return l[2] end, args)) -- arguments
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)
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if not ret then
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rspamd_logger.errx(task, 'got error connecting to redis')
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end
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end
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--- Check or update ratelimit
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local function rate_test_set(task, func)
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local args = {}
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-- 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) table.insert(rcpts_user, r['user']) end, rcpts)
|
||||
if fun.any(function(r)
|
||||
fun.any(function(w) return r == w end, whitelisted_rcpts) 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 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]) == 'table' then
|
||||
table.insert(args, {settings[k], rk})
|
||||
elseif 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) == 'table' then
|
||||
table.insert(args, {res, rate_key})
|
||||
elseif type(res) == 'string' then
|
||||
local plim, size = parse_string_limit(res)
|
||||
if plim then
|
||||
table.insert(args, {{size, plim, 1}, rate_key})
|
||||
end
|
||||
end
|
||||
end
|
||||
end
|
||||
else
|
||||
if type(settings[k]) == 'table' then
|
||||
table.insert(args, {settings[k], rate_key})
|
||||
elseif 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) == 'table' then
|
||||
table.insert(args, {res, rate_key})
|
||||
elseif type(res) == 'string' then
|
||||
local plim, size = parse_string_limit(res)
|
||||
if plim then
|
||||
table.insert(args, {{size, plim, 1}, rate_key})
|
||||
end
|
||||
end
|
||||
end
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
if #args > 0 then
|
||||
func(task, args)
|
||||
end
|
||||
end
|
||||
|
||||
--- Check limit
|
||||
local function rate_test(task)
|
||||
if rspamd_lua_utils.is_rspamc_or_controller(task) then return end
|
||||
rate_test_set(task, check_limits)
|
||||
end
|
||||
--- Update limit
|
||||
local function rate_set(task)
|
||||
local action = task:get_metric_action('default')
|
||||
|
||||
if action ~= 'soft reject' then
|
||||
if rspamd_lua_utils.is_rspamc_or_controller(task) then return end
|
||||
rate_test_set(task, set_limits)
|
||||
end
|
||||
end
|
||||
|
||||
|
||||
--- Parse a single limit description
|
||||
local function parse_limit(str)
|
||||
local params = rspamd_str_split(str, ':')
|
||||
|
||||
local function set_limit(limit, burst, rate)
|
||||
limit[1] = tonumber(burst)
|
||||
limit[2] = tonumber(rate)
|
||||
end
|
||||
|
||||
if #params ~= 3 then
|
||||
rspamd_logger.errx(rspamd_config, 'invalid limit definition: ' .. str)
|
||||
return
|
||||
end
|
||||
|
||||
local key_keywords = rspamd_str_split(params[1], '_')
|
||||
for _, k in ipairs(key_keywords) do
|
||||
if (custom_keywords[k] and type(custom_keywords[k]['get_value']) == 'function') or
|
||||
(keywords[k] and type(keywords[k]['get_value']) == 'function') then
|
||||
set_limit(settings[params[1]], params[2], params[3])
|
||||
else
|
||||
rspamd_logger.errx(rspamd_config, 'invalid limit type: ' .. params[1])
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
local opts = rspamd_config:get_all_opt('ratelimit')
|
||||
if opts then
|
||||
local rates = opts['limit']
|
||||
if rates and type(rates) == 'table' then
|
||||
fun.each(parse_limit, rates)
|
||||
elseif rates and type(rates) == 'string' then
|
||||
parse_limit(rates)
|
||||
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] = lim
|
||||
elseif type(lim) == 'string' then
|
||||
local plim, size = parse_string_limit(lim)
|
||||
if plim then
|
||||
settings[t] = {size, plim, 1}
|
||||
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, fun.filter(function(_, lim)
|
||||
return type(lim) == 'string' or
|
||||
(type(lim) == 'table' and type(lim[1]) == 'number' and lim[1] > 0)
|
||||
or (type(lim) == 'table' and (lim[3]))
|
||||
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['max_delay'] then
|
||||
max_rcpt = tonumber(opts['max_delay'])
|
||||
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
|
||||
|
||||
redis_params = rspamd_parse_redis_server('ratelimit')
|
||||
if not redis_params then
|
||||
rspamd_logger.infox(rspamd_config, 'no servers are specified, disabling module')
|
||||
else
|
||||
if not ratelimit_symbol and not use_ip_score then
|
||||
rspamd_config:register_symbol({
|
||||
name = 'RATELIMIT_CHECK',
|
||||
callback = rate_test,
|
||||
type = 'prefilter',
|
||||
priority = 4,
|
||||
})
|
||||
else
|
||||
local symbol
|
||||
if not ratelimit_symbol then
|
||||
symbol = 'RATELIMIT_CHECK'
|
||||
else
|
||||
symbol = ratelimit_symbol
|
||||
end
|
||||
local id = rspamd_config:register_symbol({
|
||||
name = symbol,
|
||||
callback = rate_test,
|
||||
})
|
||||
if use_ip_score then
|
||||
rspamd_config:register_dependency(id, 'IP_SCORE')
|
||||
end
|
||||
end
|
||||
rspamd_config:register_symbol({
|
||||
name = 'RATELIMIT_SET',
|
||||
type = 'postfilter',
|
||||
priority = 5,
|
||||
callback = rate_set,
|
||||
})
|
||||
for _, v in pairs(custom_keywords) do
|
||||
if type(v) == 'table' and type(v['init']) == 'function' then
|
||||
v['init']()
|
||||
end
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
|
||||
Loading…
Reference in New Issue