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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
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 lua_maps = require "lua_maps"
local lua_util = require "lua_util"
local rspamd_hash = require "rspamd_cryptobox_hash"
local lua_selectors = require "lua_selectors"
-- A plugin that implements ratelimits using redis
local E = {}
local N = 'ratelimit'
local redis_params
-- Senders that are considered as bounce
local settings = {
bounce_senders = { 'postmaster', 'mailer-daemon', '', 'null', 'fetchmail-daemon', 'mdaemon' },
-- Do not check ratelimits for these recipients
whitelisted_rcpts = { 'postmaster', 'mailer-daemon' },
prefix = 'RL',
ham_factor_rate = 1.01,
spam_factor_rate = 0.99,
ham_factor_burst = 1.02,
spam_factor_burst = 0.98,
max_rate_mult = 5,
max_bucket_mult = 10,
expire = 60 * 60 * 24 * 2, -- 2 days by default
limits = {},
allow_local = false,
}
-- Checks bucket, updating it if needed
-- KEYS[1] - prefix to update, e.g. RL_<triplet>_<seconds>
-- KEYS[2] - current time in milliseconds
-- KEYS[3] - bucket leak rate (messages per millisecond)
-- KEYS[4] - bucket burst
-- KEYS[5] - expire for a bucket
-- return 1 if message should be ratelimited and 0 if not
-- Redis keys used:
-- l - last hit
-- b - current burst
-- dr - current dynamic rate multiplier (*10000)
-- db - current dynamic burst multiplier (*10000)
local bucket_check_script = [[
local last = redis.call('HGET', KEYS[1], 'l')
local now = tonumber(KEYS[2])
local dynr, dynb, leaked = 0, 0, 0
if not last then
-- New bucket
redis.call('HSET', KEYS[1], 'l', KEYS[2])
redis.call('HSET', KEYS[1], 'b', '0')
redis.call('HSET', KEYS[1], 'dr', '10000')
redis.call('HSET', KEYS[1], 'db', '10000')
redis.call('EXPIRE', KEYS[1], KEYS[5])
return {0, '0', '1', '1', '0'}
end
last = tonumber(last)
local burst = tonumber(redis.call('HGET', KEYS[1], 'b'))
-- Perform leak
if burst > 0 then
if last < tonumber(KEYS[2]) then
local rate = tonumber(KEYS[3])
dynr = tonumber(redis.call('HGET', KEYS[1], 'dr')) / 10000.0
rate = rate * dynr
leaked = ((now - last) * rate)
burst = burst - leaked
redis.call('HINCRBYFLOAT', KEYS[1], 'b', -(leaked))
redis.call('HSET', KEYS[1], 'l', KEYS[2])
end
else
burst = 0
redis.call('HSET', KEYS[1], 'b', '0')
end
dynb = tonumber(redis.call('HGET', KEYS[1], 'db')) / 10000.0
if (burst + 1) > tonumber(KEYS[4]) * dynb then
return {1, tostring(burst), tostring(dynr), tostring(dynb), tostring(leaked)}
end
return {0, tostring(burst), tostring(dynr), tostring(dynb), tostring(leaked)}
]]
local bucket_check_id
-- Updates a bucket
-- KEYS[1] - prefix to update, e.g. RL_<triplet>_<seconds>
-- KEYS[2] - current time in milliseconds
-- KEYS[3] - dynamic rate multiplier
-- KEYS[4] - dynamic burst multiplier
-- KEYS[5] - max dyn rate (min: 1/x)
-- KEYS[6] - max burst rate (min: 1/x)
-- KEYS[7] - expire for a bucket
-- Redis keys used:
-- l - last hit
-- b - current burst
-- dr - current dynamic rate multiplier
-- db - current dynamic burst multiplier
local bucket_update_script = [[
local last = redis.call('HGET', KEYS[1], 'l')
local now = tonumber(KEYS[2])
if not last then
-- New bucket
redis.call('HSET', KEYS[1], 'l', KEYS[2])
redis.call('HSET', KEYS[1], 'b', '1')
redis.call('HSET', KEYS[1], 'dr', '10000')
redis.call('HSET', KEYS[1], 'db', '10000')
redis.call('EXPIRE', KEYS[1], KEYS[7])
return {1, 1, 1}
end
local burst = tonumber(redis.call('HGET', KEYS[1], 'b'))
local db = tonumber(redis.call('HGET', KEYS[1], 'db')) / 10000
local dr = tonumber(redis.call('HGET', KEYS[1], 'dr')) / 10000
if dr < tonumber(KEYS[5]) and dr > 1.0 / tonumber(KEYS[5]) then
dr = dr * tonumber(KEYS[3])
redis.call('HSET', KEYS[1], 'dr', tostring(math.floor(dr * 10000)))
end
if db < tonumber(KEYS[6]) and db > 1.0 / tonumber(KEYS[6]) then
db = db * tonumber(KEYS[4])
redis.call('HSET', KEYS[1], 'db', tostring(math.floor(db * 10000)))
end
redis.call('HINCRBYFLOAT', KEYS[1], 'b', 1)
redis.call('HSET', KEYS[1], 'l', KEYS[2])
redis.call('EXPIRE', KEYS[1], KEYS[7])
return {tostring(burst), tostring(dr), tostring(db)}
]]
local bucket_update_id
-- message_func(task, limit_type, prefix, bucket)
local message_func = function(_, limit_type, _, _)
return string.format('Ratelimit "%s" exceeded', limit_type)
end
local function load_scripts(cfg, ev_base)
bucket_check_id = lua_redis.add_redis_script(bucket_check_script, redis_params)
bucket_update_id = lua_redis.add_redis_script(bucket_update_script, redis_params)
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 parse_limit(name, data)
local buckets = {}
if type(data) == 'table' then
-- 3 cases here:
-- * old limit in format [burst, rate]
-- * vector of strings in Andrew's string format
-- * proper bucket table
if #data == 2 and tonumber(data[1]) and tonumber(data[2]) then
-- Old style ratelimit
rspamd_logger.warnx(rspamd_config, 'old style ratelimit for %s', name)
if tonumber(data[1]) > 0 and tonumber(data[2]) > 0 then
table.insert(buckets, {
burst = data[1],
rate = data[2]
})
elseif data[1] ~= 0 then
rspamd_logger.warnx(rspamd_config, 'invalid numbers for %s', name)
else
rspamd_logger.infox(rspamd_config, 'disable limit %s, burst is zero', name)
end
else
-- Recursively map parse_limit and flatten the list
fun.each(function(l)
-- Flatten list
for _,b in ipairs(l) do table.insert(buckets, b) end
end, fun.map(function(d) return parse_limit(d, name) end, data))
end
elseif type(data) == 'string' then
local rep_rate, burst = parse_string_limit(data)
if rep_rate and burst then
table.insert(buckets, {
burst = burst,
rate = 1.0 / rep_rate -- reciprocal
})
end
end
-- Filter valid
return fun.totable(fun.filter(function(val)
return type(val.burst) == 'number' and type(val.rate) == 'number'
end, buckets))
end
--- Check whether this addr is bounce
local function check_bounce(from)
return fun.any(function(b) return b == from end, settings.bounce_senders)
end
local keywords = {
['ip'] = {
['get_value'] = function(task)
local ip = task:get_ip()
if ip and ip:is_valid() then return tostring(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 tostring(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(task)
return task:get_principal_recipient()
end,
},
['digest'] = {
['get_value'] = function(task)
return task:get_digest()
end,
},
['attachments'] = {
['get_value'] = function(task)
local parts = task:get_parts() or E
local digests = {}
for _,p in ipairs(parts) do
if p:get_filename() then
table.insert(digests, p:get_digest())
end
end
if #digests > 0 then
return table.concat(digests, '')
end
return nil
end,
},
['files'] = {
['get_value'] = function(task)
local parts = task:get_parts() or E
local files = {}
for _,p in ipairs(parts) do
local fname = p:get_filename()
if fname then
table.insert(files, fname)
end
end
if #files > 0 then
return table.concat(files, ':')
end
return nil
end,
},
}
local function gen_rate_key(task, rtype, bucket)
local key_t = {tostring(lua_util.round(100000.0 / bucket.burst))}
local key_keywords = lua_util.str_split(rtype, '_')
local have_user = false
for _, v in ipairs(key_keywords) do
local ret
if keywords[v] and type(keywords[v]['get_value']) == 'function' then
ret = keywords[v]['get_value'](task)
end
if not ret then return nil end
if v == 'user' then have_user = true end
if type(ret) ~= 'string' then ret = tostring(ret) end
table.insert(key_t, ret)
end
if have_user and not task:get_user() then
return nil
end
return table.concat(key_t, ":")
end
local function make_prefix(redis_key, name, bucket)
local hash_len = 24
if hash_len > #redis_key then hash_len = #redis_key end
local hash = settings.prefix ..
string.sub(rspamd_hash.create(redis_key):base32(), 1, hash_len)
-- Fill defaults
if not bucket.spam_factor_rate then
bucket.spam_factor_rate = settings.spam_factor_rate
end
if not bucket.ham_factor_rate then
bucket.ham_factor_rate = settings.ham_factor_rate
end
if not bucket.spam_factor_burst then
bucket.spam_factor_burst = settings.spam_factor_burst
end
if not bucket.ham_factor_burst then
bucket.ham_factor_burst = settings.ham_factor_burst
end
return {
bucket = bucket,
name = name,
hash = hash
}
end
local function limit_to_prefixes(task, k, v, prefixes)
local n = 0
for _,bucket in ipairs(v.buckets) do
if v.selector then
local selectors = lua_selectors.process_selectors(task, v.selector)
if selectors then
local combined = lua_selectors.combine_selectors(task, selectors, ':')
if type(combined) == 'string' then
prefixes[combined] = make_prefix(combined, k, bucket)
n = n + 1
else
fun.each(function(p)
prefixes[p] = make_prefix(p, k, bucket)
n = n + 1
end, combined)
end
end
else
local prefix = gen_rate_key(task, k, bucket)
if prefix then
if type(prefix) == 'string' then
prefixes[prefix] = make_prefix(prefix, k, bucket)
n = n + 1
else
fun.each(function(p)
prefixes[p] = make_prefix(p, k, bucket)
n = n + 1
end, prefix)
end
end
end
end
return n
end
local function ratelimit_cb(task)
if not settings.allow_local and
rspamd_lua_utils.is_rspamc_or_controller(task) then return end
-- Get initial task data
local ip = task:get_from_ip()
if ip and ip:is_valid() and settings.whitelisted_ip then
if settings.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) return settings.whitelisted_rcpts:get_key(r) end, rcpts_user) then
rspamd_logger.infox(task, 'skip ratelimit for whitelisted recipient')
return
end
end
-- Get user (authuser)
if settings.whitelisted_user then
local auser = task:get_user()
if settings.whitelisted_user:get_key(auser) then
rspamd_logger.infox(task, 'skip ratelimit for whitelisted user')
return
end
end
-- Now create all ratelimit prefixes
local prefixes = {}
local nprefixes = 0
for k,v in pairs(settings.limits) do
nprefixes = nprefixes + limit_to_prefixes(task, k, v, prefixes)
end
for k, hdl in pairs(settings.custom_keywords or E) do
local ret, redis_key, bd = pcall(hdl, task)
if ret then
local bucket = parse_limit(k, bd)
if bucket[1] then
prefixes[redis_key] = make_prefix(redis_key, k, bucket[1])
end
nprefixes = nprefixes + 1
else
rspamd_logger.errx(task, 'cannot call handler for %s: %s',
k, redis_key)
end
end
local function gen_check_cb(prefix, bucket, lim_name)
return function(err, data)
if err then
rspamd_logger.errx('cannot check limit %s: %s %s', prefix, err, data)
elseif type(data) == 'table' and data[1] then
lua_util.debugm(N, task,
"got reply for limit %s (%s / %s); %s burst, %s:%s dyn, %s leaked",
prefix, bucket.burst, bucket.rate,
data[2], data[3], data[4], data[5])
if data[1] == 1 then
-- set symbol only and do NOT soft reject
if settings.symbol then
task:insert_result(settings.symbol, 0.0, lim_name .. "(" .. prefix .. ")")
rspamd_logger.infox(task,
'set_symbol_only: ratelimit "%s(%s)" exceeded, (%s / %s): %s (%s:%s dyn)',
lim_name, prefix,
bucket.burst, bucket.rate,
data[2], data[3], data[4])
return
-- set INFO symbol and soft reject
elseif settings.info_symbol then
task:insert_result(settings.info_symbol, 1.0,
lim_name .. "(" .. prefix .. ")")
end
rspamd_logger.infox(task,
'ratelimit "%s(%s)" exceeded, (%s / %s): %s (%s:%s dyn)',
lim_name, prefix,
bucket.burst, bucket.rate,
data[2], data[3], data[4])
task:set_pre_result('soft reject',
message_func(task, lim_name, prefix, bucket), N)
end
end
end
end
-- Don't do anything if pre-result has been already set
if task:has_pre_result() then return end
if nprefixes > 0 then
-- Save prefixes to the cache to allow update
task:cache_set('ratelimit_prefixes', prefixes)
local now = rspamd_util.get_time()
now = lua_util.round(now * 1000.0) -- Get milliseconds
-- Now call check script for all defined prefixes
for pr,value in pairs(prefixes) do
local bucket = value.bucket
local rate = (bucket.rate) / 1000.0 -- Leak rate in messages/ms
lua_util.debugm(N, task, "check limit %s:%s -> %s (%s/%s)",
value.name, pr, value.hash, bucket.burst, bucket.rate)
lua_redis.exec_redis_script(bucket_check_id,
{key = value.hash, task = task, is_write = true},
gen_check_cb(pr, bucket, value.name),
{value.hash, tostring(now), tostring(rate), tostring(bucket.burst),
tostring(settings.expire)})
end
end
end
local function ratelimit_update_cb(task)
local prefixes = task:cache_get('ratelimit_prefixes')
if prefixes then
if task:has_pre_result() then
-- Already rate limited/greylisted, do nothing
lua_util.debugm(N, task, 'pre-action has been set, do not update')
return
end
local is_spam = not (task:get_metric_action() == 'no action')
-- Update each bucket
for k, v in pairs(prefixes) do
local bucket = v.bucket
local function update_bucket_cb(err, data)
if err then
rspamd_logger.errx(task, 'cannot update rate bucket %s: %s',
k, err)
else
lua_util.debugm(N, task,
"updated limit %s:%s -> %s (%s/%s), burst: %s, dyn_rate: %s, dyn_burst: %s",
v.name, k, v.hash,
bucket.burst, bucket.rate,
data[1], data[2], data[3])
end
end
local now = rspamd_util.get_time()
now = lua_util.round(now * 1000.0) -- Get milliseconds
local mult_burst = bucket.ham_factor_burst or 1.0
local mult_rate = bucket.ham_factor_burst or 1.0
if is_spam then
mult_burst = bucket.spam_factor_burst or 1.0
mult_rate = bucket.spam_factor_rate or 1.0
end
lua_redis.exec_redis_script(bucket_update_id,
{key = v.hash, task = task, is_write = true},
update_bucket_cb,
{v.hash, tostring(now), tostring(mult_rate), tostring(mult_burst),
tostring(settings.max_rate_mult), tostring(settings.max_bucket_mult),
tostring(settings.expire)})
end
end
end
local opts = rspamd_config:get_all_opt(N)
if opts then
settings = lua_util.override_defaults(settings, opts)
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)
local buckets
if type(lim) == 'table' and lim.selector and lim.bucket then
local selector = lua_selectors.parse_selector(rspamd_config, lim.selector)
if not selector then
rspamd_logger.errx(rspamd_config, 'bad ratelimit selector for %s: "%s"',
t, lim.selector)
return
end
local bucket = parse_limit(t, lim.bucket)
if not bucket then
rspamd_logger.errx(rspamd_config, 'bad ratelimit bucket for %s: "%s"',
t, lim.bucket)
return
end
settings.limits[t] = {
selector = selector,
buckets = bucket
}
else
buckets = parse_limit(t, lim)
if buckets and #buckets > 0 then
settings.limits[t] = {
buckets = buckets
}
end
end
end, opts['rates'])
end
local enabled_limits = fun.totable(fun.map(function(t)
return t
end, settings.limits))
rspamd_logger.infox(rspamd_config,
'enabled rate buckets: [%1]', table.concat(enabled_limits, ','))
-- Ret, ret, ret: stupid legacy stuff:
-- If we have a string with commas then load it as as static map
-- otherwise, apply normal logic of Rspamd maps
local wrcpts = opts['whitelisted_rcpts']
if type(wrcpts) == 'string' then
if string.find(wrcpts, ',') then
settings.whitelisted_rcpts = lua_maps.rspamd_map_add_from_ucl(
lua_util.rspamd_str_split(wrcpts, ','), 'set', 'Ratelimit whitelisted rcpts')
else
settings.whitelisted_rcpts = lua_maps.rspamd_map_add_from_ucl(wrcpts, 'set',
'Ratelimit whitelisted rcpts')
end
elseif type(opts['whitelisted_rcpts']) == 'table' then
settings.whitelisted_rcpts = lua_maps.rspamd_map_add_from_ucl(wrcpts, 'set',
'Ratelimit whitelisted rcpts')
else
-- Stupid default...
settings.whitelisted_rcpts = lua_maps.rspamd_map_add_from_ucl(
settings.whitelisted_rcpts, 'set', 'Ratelimit whitelisted rcpts')
end
if opts['whitelisted_ip'] then
settings.whitelisted_ip = lua_maps.rspamd_map_add('ratelimit', 'whitelisted_ip', 'radix',
'Ratelimit whitelist ip map')
end
if opts['whitelisted_user'] then
settings.whitelisted_user = lua_maps.rspamd_map_add('ratelimit', 'whitelisted_user', 'set',
'Ratelimit whitelist user map')
end
settings.custom_keywords = {}
if opts['custom_keywords'] then
local ret, res_or_err = pcall(loadfile(opts['custom_keywords']))
if ret then
opts['custom_keywords'] = {}
if type(res_or_err) == 'table' then
for k,hdl in pairs(res_or_err) do
settings['custom_keywords'][k] = hdl
end
elseif type(res_or_err) == 'function' then
settings['custom_keywords']['custom'] = res_or_err
end
else
rspamd_logger.errx(rspamd_config, 'cannot execute %s: %s',
opts['custom_keywords'], res_or_err)
settings['custom_keywords'] = {}
end
end
if opts['message_func'] then
message_func = assert(load(opts['message_func']))()
end
redis_params = lua_redis.parse_redis_server('ratelimit')
if not redis_params then
rspamd_logger.infox(rspamd_config, 'no servers are specified, disabling module')
lua_util.disable_module(N, "redis")
else
local s = {
type = 'prefilter,nostat',
name = 'RATELIMIT_CHECK',
priority = 7,
callback = ratelimit_cb,
flags = 'empty',
}
if settings.symbol then
s.name = settings.symbol
elseif settings.info_symbol then
s.name = settings.info_symbol
end
rspamd_config:register_symbol(s)
rspamd_config:register_symbol {
type = 'idempotent',
name = 'RATELIMIT_UPDATE',
callback = ratelimit_update_cb,
}
end
end
rspamd_config:add_on_load(function(cfg, ev_base, worker)
load_scripts(cfg, ev_base)
end)
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