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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.
]]--
-- 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)
task:inc_dns_req()
if results then
logger.info(string.format('<%s> email: [%s] resolved for symbol: %s',
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:get_session(), task:get_mempool(),
to_resolve, 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.info(string.format('<%s> email: \'%s\' is found in list: %s',
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.info(string.format('<%s> email: \'%s\' is found in list: %s',
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
-- Registration
if type(rspamd_config.get_api_version) ~= 'nil' then
if rspamd_config:get_api_version() >= 2 then
rspamd_config:register_module_option('emails', 'rule', 'string')
else
logger.err('Invalid rspamd version for this plugin')
end
end
local opts = rspamd_config:get_all_opt('emails', 'rule')
if opts and type(opts) == 'table' then
for k,v in pairs(opts) do
if k == 'rule' and type(v) == 'table' then
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_hash_map (rule['name'])
end
if not rule['symbol'] or (not rule['map'] and not rule['dnsbl']) then
logger.err('incomplete rule')
else
table.insert(rules, rule)
rspamd_config:register_virtual_symbol(rule['symbol'], 1.0)
end
end
end
end
if table.maxn(rules) > 0 then
-- add fake symbol to check all maps inside a single callback
if type(rspamd_config.get_api_version) ~= 'nil' then
rspamd_config:register_callback_symbol('EMAILS', 1.0, check_emails)
else
rspamd_config:register_symbol('EMAILS', 1.0, check_emails)
end
end
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