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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.
]]--
-- Module for checking mail list headers
local symbol = 'MAILLIST'
local rspamd_logger = require "rspamd_logger"
-- EZMLM
-- Mailing-List: .*run by ezmlm
-- Precedence: bulk
-- List-Post: <mailto:
-- List-Help: <mailto:
-- List-Unsubscribe: <mailto:[a-zA-Z\.-]+-unsubscribe@
-- List-Subscribe: <mailto:[a-zA-Z\.-]+-subscribe@
local function check_ml_ezmlm(task)
-- Mailing-List
local header = task:get_header('mailing-list')
if not header or not string.find(header, 'ezmlm$') then
return false
end
-- Precedence
header = task:get_header('precedence')
if not header or not string.match(header, '^bulk$') then
return false
end
-- Other headers
header = task:get_header('list-post')
if not header or not string.find(header, '^<mailto:') then
return false
end
header = task:get_header('list-help')
if not header or not string.find(header, '^<mailto:') then
return false
end
-- Subscribe and unsubscribe
header = task:get_header('list-subscribe')
if not header or not string.find(header, '<mailto:[a-zA-Z.-]+-subscribe@') then
return false
end
header = task:get_header('list-unsubscribe')
if not header or not string.find(header, '<mailto:[a-zA-Z.-]+-unsubscribe@') then
return false
end
return true
end
-- MailMan (the gnu mailing list manager)
-- Precedence: bulk [or list for v2]
-- List-Help: <mailto:
-- List-Post: <mailto:
-- List-Subscribe: .*<mailto:.*=subscribe>
-- List-Id:
-- List-Unsubscribe: .*<mailto:.*=unsubscribe>
-- List-Archive:
-- X-Mailman-Version: \d
local function check_ml_mailman(task)
-- Mailing-List
local header = task:get_header('x-mailman-version')
if not header or not string.find(header, '^%d') then
return false
end
-- Precedence
header = task:get_header('precedence')
if not header or (not string.match(header, '^bulk$') and not string.match(header, '^list$')) then
return false
end
-- For reminders we have other headers than for normal messages
header = task:get_header('x-list-administrivia')
local subject = task:get_header('subject')
if (header and string.find(header, 'yes')) or (subject and string.find(subject, 'mailing list memberships reminder$')) then
if not task:get_header('errors-to') or not task:get_header('x-beenthere') then
return false
end
header = task:get_header('x-no-archive')
if not header or not string.find(header, 'yes') then
return false
end
return true
end
-- Other headers
header = task:get_header('list-id')
if not header then
return false
end
header = task:get_header('list-post')
if not header or not string.find(header, '^<mailto:') then
return false
end
header = task:get_header('list-help')
if not header or not string.find(header, '^<mailto:') then
return false
end
-- Subscribe and unsubscribe
header = task:get_header('list-subscribe')
if not header or not string.find(header, '<mailto:.*=subscribe>') then
return false
end
header = task:get_header('list-unsubscribe')
if not header or not string.find(header, '<mailto:.*=unsubscribe>') then
return false
end
return true
end
-- Subscribe.ru
-- Precedence: normal
-- List-Id: <.*.subscribe.ru>
-- List-Help: <http://subscribe.ru/catalog/.*>
-- List-Subscribe: <mailto:.*-sub@subscribe.ru>
-- List-Unsubscribe: <mailto:.*-unsub@subscribe.ru>
-- List-Archive: <http://subscribe.ru/archive/.*>
-- List-Owner: <mailto:.*-owner@subscribe.ru>
-- List-Post: NO
local function check_ml_subscriberu(task)
-- List-Id
local header = task:get_header('list-id')
if not header or not string.find(header, '^<.*%.subscribe%.ru>$') then
return false
end
-- Precedence
header = task:get_header('precedence')
if not header or not string.match(header, '^normal$') then
return false
end
-- Other headers
header = task:get_header('list-archive')
if not header or not string.find(header, '^<http://subscribe.ru/archive/.*>$') then
return false
end
header = task:get_header('list-owner')
if not header or not string.find(header, '^<mailto:.*-owner@subscribe.ru>$') then
return false
end
header = task:get_header('list-help')
if not header or not string.find(header, '^<http://subscribe.ru/catalog/.*>$') then
return false
end
-- Subscribe and unsubscribe
header = task:get_header('list-subscribe')
if not header or not string.find(header, '^<mailto:.*-sub@subscribe.ru>$') then
return false
end
header = task:get_header('list-unsubscribe')
if not header or not string.find(header, '^<mailto:.*-unsub@subscribe.ru>$') then
return false
end
return true
end
-- RFC 2369 headers
local function check_rfc2369(task)
header = task:get_header('List-Unsubscribe')
if not header or not string.find(header, '<.+>') then
return false
end
header = task:get_header('List-Post')
if not header or not string.find(header, '<.+>') then
return false
end
return true
end
-- RFC 2919 headers
local function check_rfc2919(task)
local header = task:get_header('List-Id')
if not header or not string.find(header, '<.+>') then
return false
end
return check_rfc2369(task)
end
-- Google groups detector
-- header exists X-Google-Loop
-- RFC 2919 headers exist
--
local function check_ml_googlegroup(task)
local header = task:get_header('X-Google-Loop')
if not header then
header = task:get_header('X-Google-Group-Id')
if not header then
return false
end
end
return check_rfc2919(task)
end
-- Majordomo detector
-- Check Sender for owner- or -owner
-- Check Precendence for 'Bulk' or 'List'
--
-- And nothing more can be extracted :(
local function check_ml_majordomo(task)
local header = task:get_header('Sender')
if not header or (not string.find(header, '^owner-.*$') and not string.find(header, '^.*-owner$')) then
return false
end
local header = task:get_header('Precedence')
if not header or (header ~= 'list' and header ~= 'bulk') then
return false
end
return true
end
-- CGP detector
-- X-Listserver = CommuniGate Pro LIST
-- RFC 2919 headers exist
--
local function check_ml_cgp(task)
local header = task:get_header('X-Listserver')
if not header or header ~= 'CommuniGate Pro LIST' then
return false
end
return check_rfc2919(task)
end
local function check_maillist(task)
if check_ml_ezmlm(task) then
task:insert_result(symbol, 1, 'ezmlm')
elseif check_ml_mailman(task) then
task:insert_result(symbol, 1, 'mailman')
elseif check_ml_subscriberu(task) then
task:insert_result(symbol, 1, 'subscribe.ru')
elseif check_ml_googlegroup(task) then
task:insert_result(symbol, 1, 'googlegroups')
elseif check_ml_majordomo(task) then
task:insert_result(symbol, 1, 'majordomo')
elseif check_ml_cgp(task) then
task:insert_result(symbol, 1, 'cgp')
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('maillist', 'symbol', 'string')
end
end
-- Configuration
local opts = rspamd_config:get_all_opt('maillist')if opts then
if opts['symbol'] then
symbol = opts['symbol']
rspamd_config:register_symbol(symbol, 1.0, check_maillist)
end
end
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