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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.
]]--
-- Emails is module for different checks for emails inside messages
-- Rules format:
-- symbol = sym, map = file:///path/to/file, domain_only = yes
-- symbol = sym2, dnsbl = bl.somehost.com, domain_only = no
local rules = {}
local logger = require "rspamd_logger"
-- Check rule for a single email
local function check_email_rule(task, rule, addr)
local function emails_dns_cb(resolver, to_resolve, results, err)
if results then
logger.infox(task, '<%1> email: [%2] resolved for symbol: %3',
task:get_message_id(), to_resolve, rule['symbol'])
task:insert_result(rule['symbol'], 1)
end
end
if rule['dnsbl'] then
local to_resolve = ''
if rule['domain_only'] then
to_resolve = string.format('%s.%s', addr:get_host(), rule['dnsbl'])
else
to_resolve = string.format('%s.%s.%s', addr:get_user(), addr:get_host(), rule['dnsbl'])
end
task:get_resolver():resolve_a({
task=task,
name = to_resolve,
callback = emails_dns_cb})
elseif rule['map'] then
if rule['domain_only'] then
local key = addr:get_host()
if rule['map']:get_key(key) then
task:insert_result(rule['symbol'], 1)
logger.infox(task, '<%1> email: \'%2\' is found in list: %3',
task:get_message_id(), key, rule['symbol'])
end
else
local key = string.format('%s@%s', addr:get_user(), addr:get_host())
if rule['map']:get_key(key) then
task:insert_result(rule['symbol'], 1)
logger.infox(task, '<%1> email: \'%2\' is found in list: %3',
task:get_message_id(), key, rule['symbol'])
end
end
end
end
-- Check email
local function check_emails(task)
local emails = task:get_emails()
local checked = {}
if emails then
for _,addr in ipairs(emails) do
local to_check = string.format('%s@%s', addr:get_user(), addr:get_host())
if not checked['to_check'] then
for _,rule in ipairs(rules) do
check_email_rule(task, rule, addr)
end
checked[to_check] = true
end
end
end
end
local opts = rspamd_config:get_all_opt('emails', 'rule')
if opts and type(opts) == 'table' then
if opts['enabled'] == false then
logger.info('Module is disabled')
return
end
local r = opts['rule']
if r then
for k,v in pairs(r) do
local rule = v
if not rule['symbol'] then
rule['symbol'] = k
end
if rule['map'] then
rule['name'] = rule['map']
rule['map'] = rspamd_config:add_map({
url = rule['name'],
description = string.format('Emails rule %s', rule['symbol']),
type = 'regexp'
})
end
if not rule['symbol'] or (not rule['map'] and not rule['dnsbl']) then
logger.errx(rspamd_config, 'incomplete rule')
else
table.insert(rules, rule)
end
end
end
end
if #rules > 0 then
-- add fake symbol to check all maps inside a single callback
local id = rspamd_config:register_symbol({
type = 'callback',
callback = check_emails
})
for _,rule in ipairs(rules) do
rspamd_config:register_symbol({
name = rule['symbol'],
type = 'virtual',
parent = id
})
end
end
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