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--[[
Copyright (c) 2011-2015, Vsevolod Stakhov <vsevolod@highsecure.ru>
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.
]]--
-- 0 or 1 received: = spam
local symbol = 'ONCE_RECEIVED'
local symbol_rdns = 'RDNS_NONE'
-- Symbol for strict checks
local symbol_strict = nil
local bad_hosts = {}
local good_hosts = {}
local whitelist = nil
local rspamd_logger = require "rspamd_logger"
local check_local = false
local check_authed = false
local function check_quantity_received (task)
local recvh = task:get_received_headers()
local function recv_dns_cb(_, to_resolve, results, err)
if err then
rspamd_logger.errx(task, 'DNS lookup error: %s', err)
end
task:inc_dns_req()
if not results then
if recvh and #recvh <= 1 then
task:insert_result(symbol, 1)
task:insert_result(symbol_strict, 1)
end
task:insert_result(symbol_rdns, 1)
else
rspamd_logger.infox(task, 'SMTP resolver failed to resolve: %1 is %2',
to_resolve, results[1])
if good_hosts then
for _,gh in ipairs(good_hosts) do
if string.find(results[1], gh) then
return
end
end
end
task:insert_result(symbol, 1)
for _,h in ipairs(bad_hosts) do
if string.find(results[1], h) then
task:insert_result(symbol_strict, 1, h)
return
end
end
end
end
local task_ip = task:get_ip()
if ((not check_authed and task:get_user()) or
(not check_local and task_ip and task_ip:is_local())) then
rspamd_logger.infox(task, 'Skipping once_received for authenticated user or local network')
return
end
if whitelist and task_ip and whitelist:get_key(task_ip) then
rspamd_logger.infox(task, 'whitelisted mail from %s',
task_ip:to_string())
return
end
local hn = task:get_hostname()
-- Here we don't care about received
if (not hn or hn == 'unknown') and task_ip and task_ip:is_valid() then
task:get_resolver():resolve_ptr({task = task,
name = task_ip:to_string(),
callback = recv_dns_cb,
forced = true
})
return
end
if recvh and #recvh <= 1 then
local ret = true
local r = recvh[1]
if not r then
return
end
if r['real_hostname'] then
local rhn = string.lower(r['real_hostname'])
-- Check for good hostname
if rhn and good_hosts then
for _,gh in ipairs(good_hosts) do
if string.find(rhn, gh) then
ret = false
break
end
end
end
end
if ret then
-- Strict checks
if symbol_strict then
-- Unresolved host
task:insert_result(symbol, 1)
if not hn then return end
for _,h in ipairs(bad_hosts) do
if string.find(hn, h) then
task:insert_result(symbol_strict, 1, h)
return
end
end
else
task:insert_result(symbol, 1)
end
end
end
end
-- Registration
if type(rspamd_config.get_api_version) ~= 'nil' then
if rspamd_config:get_api_version() >= 1 then
rspamd_config:register_module_option('once_received', 'symbol', 'string')
rspamd_config:register_module_option('once_received', 'symbol_strict', 'string')
rspamd_config:register_module_option('once_received', 'bad_host', 'string')
rspamd_config:register_module_option('once_received', 'good_host', 'string')
end
end
local opts = rspamd_config:get_all_opt('options')
if opts and type(opts) ~= 'table' then
if type(opts['check_local']) == 'boolean' then
check_local = opts['check_local']
end
if type(opts['check_authed']) == 'boolean' then
check_authed = opts['check_authed']
end
end
-- Configuration
opts = rspamd_config:get_all_opt('once_received')
if opts then
if opts['symbol'] then
symbol = opts['symbol']
local id = rspamd_config:register_symbol({
name = symbol,
callback = check_quantity_received,
})
for n,v in pairs(opts) do
if n == 'symbol_strict' then
symbol_strict = v
elseif n == 'symbol_rdns' then
symbol_rdns = v
elseif n == 'bad_host' then
if type(v) == 'string' then
bad_hosts[1] = v
else
bad_hosts = v
end
elseif n == 'good_host' then
if type(v) == 'string' then
good_hosts[1] = v
else
good_hosts = v
end
elseif n == 'whitelist' then
whitelist = rspamd_config:add_radix_map (v, 'once received whitelist')
end
end
rspamd_config:register_symbol({
name = symbol_rdns,
type = 'virtual',
parent = id
})
rspamd_config:register_symbol({
name = symbol_strict,
type = 'virtual',
parent = id
})
end
end
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