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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.
]]--
-- This is main lua config file for rspamd
local util = require "rspamd_util"
local rspamd_regexp = require "rspamd_regexp"
local rspamd_logger = require "rspamd_logger"
local reconf = config['regexp']
-- Uncategorized rules
local subject_re = rspamd_regexp.create('/^(?:(?:Re|Fwd|Fw|Aw|Antwort|Sv):\\s*)+(.+)$/i')
-- Local rules
local r_bgcolor = '/BGCOLOR=/iP'
local r_font_color = '/font color=[\\"\']?\\#FFFFFF[\\"\']?/iP'
reconf['R_WHITE_ON_WHITE'] = string.format('(!(%s) & (%s))', r_bgcolor, r_font_color)
reconf['R_FLASH_REDIR_IMGSHACK'] = '/^(?:http:\\/\\/)?img\\d{1,5}\\.imageshack\\.us\\/\\S+\\.swf/U'
-- Different text parts
rspamd_config.R_PARTS_DIFFER = function(task)
local distance = task:get_mempool():get_variable('parts_distance', 'int')
if distance then
local nd = tonumber(distance)
if nd < 50 then
local score = 1 - util.tanh(nd / 100.0)
task:insert_result('R_PARTS_DIFFER', score, tostring(nd) .. '%')
end
end
return false
end
-- Date issues
rspamd_config.MISSING_DATE = function(task)
if rspamd_config:get_api_version() >= 5 then
if not task:get_header_raw('Date') then
return true
end
end
return false
end
rspamd_config.DATE_IN_FUTURE = function(task)
if rspamd_config:get_api_version() >= 5 then
local dm = task:get_date{format = 'message'}
local dt = task:get_date{format = 'connect'}
-- An 2 hour
if dm > 0 and dm - dt > 7200 then
return true
end
end
return false
end
rspamd_config.DATE_IN_PAST = function(task)
if rspamd_config:get_api_version() >= 5 then
local dm = task:get_date{format = 'message', gmt = true}
local dt = task:get_date{format = 'connect', gmt = true}
-- A day
if dm > 0 and dt - dm > 86400 then
return true
end
end
return false
end
rspamd_config.R_SUSPICIOUS_URL = {
callback = function(task)
local urls = task:get_urls()
if urls then
for i,u in ipairs(urls) do
if u:is_obscured() then
return true
end
end
end
return false
end,
score = 6.0,
group = 'url',
one_shot = true,
description = 'Obfusicated or suspicious URL has been found in a message'
}
rspamd_config.SUBJ_ALL_CAPS = {
callback = function(task)
local sbj = task:get_header('Subject')
if sbj then
local stripped_subject = subject_re:search(sbj, false, true)
if stripped_subject and stripped_subject[1] and stripped_subject[1][2] then
sbj = stripped_subject[1][2]
end
if util.is_uppercase(sbj) then
return true
end
end
return false
end,
score = 3.0,
group = 'headers',
description = 'All capital letters in subject'
}
rspamd_config.BROKEN_HEADERS = {
callback = function(task)
if task:has_flag('broken_headers') then
return true
end
return false
end,
score = 1.0,
group = 'headers',
description = 'Headers structure is likely broken'
}
rspamd_config.HEADER_RCONFIRM_MISMATCH = {
callback = function (task)
local header_from = task:get_header('From')
local header_cread = task:get_header('X-Confirm-Reading-To')
if header_from and header_cread then
if not string.find(header_from, header_cread) then
return true
end
end
return false
end,
score = 2.0,
group = 'headers',
description = 'Read confirmation address is different to from address'
}
rspamd_config.HEADER_FORGED_MDN = {
callback = function (task)
local header_mdn = task:get_header('Disposition-Notification-To')
local header_rp = task:get_header('Return-Path')
if header_mdn and not header_rp then return true end
if header_rp and not header_mdn then return true end
if header_mdn ~= header_rp then
return true
end
return false
end,
score = 2.0,
group = 'headers',
description = 'Read confirmation address is different to return path'
}
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