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--[[
Copyright (c) 2011-2015, Vsevolod Stakhov <vsevolod@highsecure.ru>
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
]]--
-- 0 or 1 received: = spam
local symbol = 'ONCE_RECEIVED'
-- Symbol for strict checks
local symbol_strict = nil
local bad_hosts = {}
local good_hosts = {}
local rspamd_logger = require "rspamd_logger"
local function check_quantity_received (task)
local function recv_dns_cb(resolver, to_resolve, results, err)
task:inc_dns_req()
if not results then
task:insert_result(symbol_strict, 1)
else
rspamd_logger.info(string.format('SMTP resolver failed to resolve: %s is %s', to_resolve, results[1]))
local i = true
for _,h in ipairs(bad_hosts) do
if string.find(results[1], h) then
-- Check for good hostname
if good_hosts then
for _,gh in ipairs(good_hosts) do
if string.find(results[1], gh) then
i = false
break
end
end
end
if i then
task:insert_result(symbol_strict, 1, h)
return
end
end
end
end
end
if task:get_user() ~= nil then
return
end
local recvh = task:get_received_headers()
if table.maxn(recvh) <= 1 then
task:insert_result(symbol, 1)
-- Strict checks
if symbol_strict then
local r = recvh[1]
if not r then
return
end
-- Unresolved host
if not r['real_hostname'] or string.lower(r['real_hostname']) == 'unknown' or
string.match(r['real_hostname'], '^%d+%.%d+%.%d+%.%d+$') then
if r['real_ip'] and r['real_ip']:is_valid() then
-- Try to resolve it again
task:get_resolver():resolve_ptr(task:get_session(), task:get_mempool(),
r['real_ip']:to_string(), recv_dns_cb)
else
task:insert_result(symbol_strict, 1)
end
return
end
local i = true
local hn = string.lower(r['real_hostname'])
for _,h in ipairs(bad_hosts) do
if string.find(hn, h) then
-- Check for good hostname
if good_hosts then
for _,gh in ipairs(good_hosts) do
if string.find(hn, gh) then
i = false
break
end
end
end
if i then
task:insert_result(symbol_strict, 1, h)
return
end
end
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
-- Configuration
local opts = rspamd_config:get_all_opt('once_received')
if opts then
if opts['symbol'] then
local symbol = opts['symbol']
for n,v in pairs(opts) do
if n == 'symbol_strict' then
symbol_strict = v
if type(rspamd_config.get_api_version) ~= 'nil' then
rspamd_config:register_virtual_symbol(symbol_strict, 1.0)
end
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
end
end
-- Register symbol's callback
rspamd_config:register_symbol(symbol, 1.0, check_quantity_received)
end
end
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