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--[[
Copyright (c) 2016, Alexander Moisseev <moiseev@mezonplus.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.
]]--
--[[
MID plugin - suppress INVALID_MSGID and MISSING_MID for messages originating
from listed valid DKIM domains with missed or known proprietary Message-IDs
]]--
if confighelp then
return
end
local rspamd_logger = require "rspamd_logger"
local rspamd_regexp = require "rspamd_regexp"
local lua_util = require "lua_util"
local N = "mid"
local settings = {
url = '',
symbol_known_mid = 'KNOWN_MID',
symbol_known_no_mid = 'KNOWN_NO_MID',
symbol_invalid_msgid = 'INVALID_MSGID',
symbol_missing_mid = 'MISSING_MID',
symbol_dkim_allow = 'R_DKIM_ALLOW',
csymbol_invalid_msgid_allowed = 'INVALID_MSGID_ALLOWED',
csymbol_missing_mid_allowed = 'MISSING_MID_ALLOWED',
}
local map
local E = {}
local function known_mid_cb(task)
local re = {}
local header = task:get_header('Message-Id')
local das = task:get_symbol(settings['symbol_dkim_allow'])
if ((das or E)[1] or E).options then
for _, dkim_domain in ipairs(das[1]['options']) do
if dkim_domain then
local v = map:get_key(dkim_domain:match "[^:]+")
if v then
if v == '' then
if not header then
task:insert_result(settings['symbol_known_no_mid'], 1, dkim_domain)
return
end
else
re[dkim_domain] = rspamd_regexp.create_cached(v)
if header and re[dkim_domain] and re[dkim_domain]:match(header) then
task:insert_result(settings['symbol_known_mid'], 1, dkim_domain)
return
end
end
end
end
end
end
end
local opts = rspamd_config:get_all_opt('mid')
if opts then
for k, v in pairs(opts) do
settings[k] = v
end
if not opts.source then
rspamd_logger.infox(rspamd_config, 'mid module requires "source" parameter')
lua_util.disable_module(N, "config")
return
end
map = rspamd_config:add_map {
url = opts.source,
description = "Message-IDs map",
type = 'map'
}
if map then
local id = rspamd_config:register_symbol({
name = 'KNOWN_MID_CALLBACK',
type = 'callback',
group = 'mid',
callback = known_mid_cb
})
rspamd_config:register_symbol({
name = settings['symbol_known_mid'],
parent = id,
group = 'mid',
type = 'virtual'
})
rspamd_config:register_symbol({
name = settings['symbol_known_no_mid'],
parent = id,
group = 'mid',
type = 'virtual'
})
rspamd_config:add_composite(settings['csymbol_invalid_msgid_allowed'],
string.format('~%s & ^%s',
settings['symbol_known_mid'],
settings['symbol_invalid_msgid']))
rspamd_config:add_composite(settings['csymbol_missing_mid_allowed'],
string.format('~%s & ^%s',
settings['symbol_known_no_mid'],
settings['symbol_missing_mid']))
rspamd_config:register_dependency('KNOWN_MID_CALLBACK', 'DKIM_CHECK')
else
rspamd_logger.infox(rspamd_config, 'source is not a valid map definition, disabling module')
lua_util.disable_module(N, "config")
end
end
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