--[[ 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) 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 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.errx(rspamd_config, 'incomplete rule') else table.insert(rules, rule) end end end end if table.maxn(rules) > 0 then -- add fake symbol to check all maps inside a single callback local id = rspamd_config:register_callback_symbol(1.0, check_emails) for _,rule in ipairs(rules) do rspamd_config:register_virtual_symbol(rule['symbol'], 1.0, id) end end