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--[[
Copyright (c) 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.
]]--
local rspamd_logger = require "rspamd_logger"
local rspamd_url = require "rspamd_url"
local ucl = require "ucl"
require "fun" ()
local options = {
dmarc_allow_symbol = 'DMARC_POLICY_ALLOW',
spf_allow_symbol = 'R_SPF_ALLOW',
dkim_allow_symbol = 'R_DKIM_ALLOW',
rules = {}
}
local function whitelist_cb(symbol, rule, task)
local from = task:get_from(1)
if from and from[1] and from[1]['domain'] then
local domain = from[1]['domain']
local url_domain = rspamd_url.create('http://' .. domain)
local found = false
local mult = 1.0
if url_domain then
-- Get tld + 1 component
local tld = url_domain:get_tld()
local host = url_domain:get_host()
domain = string.match(host, string.format('[^.].%s$', tld)
rspamd_logger.errx(domain)
end
if rule['map'] then
local val = rule['map']:get_key(domain)
if val then
found = true
if #val > 0 then
mult = tonumber(val)
end
end
else
mult = rule['domains'][domain]
if mult then
found = true
end
end
if found then
if rule['valid_spf'] then
-- Check for spf symbol
if not task:get_symbol(options['spf_allow_symbol']) then
found = false
rspamd_logger.debugx(task, "domain %s has been found in whitelist %s" ..
"but it doesn't have valid SPF record", domain, symbol)
end
end
if rule['valid_dkim'] then
if not task:get_symbol(options['dkim_allow_symbol']) then
found = false
rspamd_logger.debugx(task, "domain %s has been found in whitelist %s" ..
"but it doesn't have valid DKIM", domain, symbol)
end
end
if rule['valid_dmarc'] then
if not task:get_symbol(options['dmarc_allow_symbol']) then
found = false
rspamd_logger.debugx(task, "domain %s has been found in whitelist %s" ..
"but it doesn't have valid DMARC", domain, symbol)
end
end
end
if found then
task:insert_result(symbol, mult, domain)
end
end
end
local function gen_whitelist_cb(symbol, rule)
return function(task)
whitelist_cb(symbol, rule, task)
end
end
local function process_whitelist_map(input)
local parser = ucl.parser()
local res,err = parser:parse_string(string)
if not res then
rspamd_logger.warnx(rspamd_config, 'cannot parse settings map: ' .. err)
else
local obj = parser:get_object()
options['rules'] = obj
end
end
local configure_whitelist_module = function()
local opts = rspamd_config:get_all_opt('whitelist')
if opts then
for k,v in pairs(opts) do
options[k] = v
end
end
if options['rules'] then
each(function(symbol, rule)
if rule['domains'] then
if type(rule['domains']) == 'string' then
rule['map'] = rspamd_config:add_kv_map(rule['domains'])
elseif type(rule['domains']) == 'table' then
-- Transform ['domain1', 'domain2' ...] to indexes:
-- {'domain1' = 1, 'domain2' = 1 ...]
rule['domains'] = tomap(map(function(d)
local name = d
local value = 1
if type(d) == 'table' then
name = d[1]
value = tonumber(d[2])
end
return name,value
end, rule['domains']))
else
rspamd_logger.errx(rspamd_config, 'whitelist %s has bad "domains" value',
symbol)
return
end
local id = rspamd_config:register_symbol(symbol, -1.0,
gen_whitelist_cb(symbol, rule))
if rule['valid_spf'] then
rspamd_config:register_dependency(id, options['spf_allow_symbol'])
end
if rule['valid_dkim'] then
rspamd_config:register_dependency(id, options['dkim_allow_symbol'])
end
if rule['valid_dmarc'] then
rspamd_config:register_dependency(id, options['dmarc_allow_symbol'])
end
if rule['score'] then
if not rule['group'] then
rule['group'] = 'whitelist'
end
rule['name'] = symbol
rspamd_config:set_metric_symbol(rule)
end
end
end, options['rules'])
end
end
configure_whitelist_module()
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