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-- Multimap is rspamd module designed to define and operate with different maps
local rules = {}
local rspamd_logger = require "rspamd_logger"
local rspamd_cdb = require "rspamd_cdb"
local function ip_to_rbl(ip, rbl)
return table.concat(ip:inversed_str_octets(), ".") .. '.' .. rbl
end
local function check_multimap(task)
local function multimap_rbl_cb(resolver, to_resolve, results, err, rbl)
task:inc_dns_req()
if results then
-- Get corresponding rule by rbl name
for _,rule in pairs(rules) do
if rule == rbl then
task:insert_result(rule['symbol'], 1, rule['map'])
return
end
end
end
end
for _,rule in pairs(rules) do
if rule['type'] == 'ip' then
if rule['cdb'] then
local ip = task:get_from_ip()
if ip:is_valid() and rule['hash']:lookup(ip:to_string()) then
task:insert_result(rule['symbol'], 1)
end
else
local ip = task:get_from_ip()
if ip:is_valid() and rule['ips'] and rule['ips']:get_key(ip:to_number()) then
task:insert_result(rule['symbol'], 1)
end
end
elseif rule['type'] == 'header' then
local headers = task:get_header_full(rule['header'])
if headers then
for _,hv in ipairs(headers) do
if rule['pattern'] then
-- extract a part from header
local _,_,ext = string.find(hv['decoded'], rule['pattern'])
if ext then
if rule['cdb'] then
if rule['hash']:lookup(ext) then
task:insert_result(rule['symbol'], 1)
end
else
if rule['hash']:get_key(ext) then
task:insert_result(rule['symbol'], 1)
end
end
end
else
if rule['cdb'] then
if rule['hash']:lookup(hv['decoded']) then
task:insert_result(rule['symbol'], 1)
end
else
if rule['hash']:get_key(hv['decoded']) then
task:insert_result(rule['symbol'], 1)
end
end
end
end
end
elseif rule['type'] == 'dnsbl' then
local ip = task:get_from_ip()
if ip:is_valid() then
if ip:get_version() == 6 and rule['ipv6'] then
task:get_resolver():resolve_a(task:get_session(), task:get_mempool(),
ip_to_rbl(ip, rule['map']), multimap_rbl_cb, rule['map'])
elseif ip:get_version() == 4 then
task:get_resolver():resolve_a(task:get_session(), task:get_mempool(),
ip_to_rbl(ip, rule['map']), multimap_rbl_cb, rule['map'])
end
end
elseif rule['type'] == 'rcpt' then
-- First try to get rcpt field
local rcpts = task:get_recipients()
if rcpts then
for _,r in ipairs(rcpts) do
if r['addr'] then
if rule['pattern'] then
-- extract a part from header
local _,_,ext = string.find(r['addr'], rule['pattern'])
if ext then
if rule['cdb'] then
if rule['hash']:lookup(ext) then
task:insert_result(rule['symbol'], 1)
end
else
if rule['hash']:get_key(ext) then
task:insert_result(rule['symbol'], 1)
end
end
end
else
if rule['cdb'] then
if rule['hash']:lookup(r['addr']) then
task:insert_result(rule['symbol'], 1)
end
else
if rule['hash']:get_key(r['addr']) then
task:insert_result(rule['symbol'], 1)
end
end
end
end
end
end
elseif rule['type'] == 'from' then
-- First try to get from field
local from = task:get_from()
if from then
for _,r in ipairs(from) do
if r['addr'] then
if rule['pattern'] then
-- extract a part from header
local _,_,ext = string.find(r['addr'], rule['pattern'])
if ext then
if rule['cdb'] then
if rule['hash']:lookup(ext) then
task:insert_result(rule['symbol'], 1)
end
else
if rule['hash']:get_key(ext) then
task:insert_result(rule['symbol'], 1)
end
end
end
else
if rule['cdb'] then
if rule['hash']:lookup(r['addr']) then
task:insert_result(rule['symbol'], 1)
end
else
if rule['hash']:get_key(r['addr']) then
task:insert_result(rule['symbol'], 1)
end
end
end
end
end
end
end
end
end
local function add_multimap_rule(key, newrule)
if not newrule['map'] then
rspamd_logger.err('incomplete rule')
return nil
end
if not newrule['symbol'] and key then
newrule['symbol'] = key
elseif not newrule['symbol'] then
rspamd_logger.err('incomplete rule')
return nil
end
-- Check cdb flag
if string.find(newrule['map'], '^cdb://.*$') then
local test = cdb.create(newrule['map'])
newrule['hash'] = cdb.create(newrule['map'])
newrule['cdb'] = true
if newrule['hash'] then
table.insert(rules, newrule)
return newrule
else
rspamd_logger.warn('Cannot add rule: map doesn\'t exists: ' .. newrule['map'])
end
else
if newrule['type'] == 'ip' then
newrule['ips'] = rspamd_config:add_radix_map (newrule['map'], newrule['description'])
if newrule['ips'] then
table.insert(rules, newrule)
return newrule
else
rspamd_logger.warn('Cannot add rule: map doesn\'t exists: ' .. newrule['map'])
end
elseif newrule['type'] == 'header' or newrule['type'] == 'rcpt' or newrule['type'] == 'from' then
newrule['hash'] = rspamd_config:add_hash_map (newrule['map'], newrule['description'])
if newrule['hash'] then
table.insert(rules, newrule)
return newrule
else
rspamd_logger.warn('Cannot add rule: map doesn\'t exists: ' .. newrule['map'])
end
elseif newrule['type'] == 'cdb' then
newrule['hash'] = rspamd_cdb.create(newrule['map'])
if newrule['hash'] then
table.insert(rules, newrule)
return newrule
else
rspamd_logger.warn('Cannot add rule: map doesn\'t exists: ' .. newrule['map'])
end
else
table.insert(rules, newrule)
return newrule
end
end
return nil
end
-- Registration
if type(rspamd_config.get_api_version) ~= 'nil' then
if rspamd_config:get_api_version() >= 1 then
rspamd_config:register_module_option('multimap', 'rule', 'string')
end
end
local opts = rspamd_config:get_all_opt('multimap')
if opts and type(opts) == 'table' then
for k,m in pairs(opts) do
if type(m) == 'table' then
local rule = add_multimap_rule(k, m)
if not rule then
rspamd_logger.err('cannot add rule: "'..k..'"')
else
if type(rspamd_config.get_api_version) ~= 'nil' then
rspamd_config:register_virtual_symbol(rule['symbol'], 1.0)
end
end
else
rspamd_logger.err('parameter ' .. k .. ' is invalid, must be an object')
end
end
-- add fake symbol to check all maps inside a single callback
if type(rspamd_config.get_api_version) ~= 'nil' then
if rspamd_config.get_api_version() >= 4 then
rspamd_config:register_callback_symbol_priority('MULTIMAP', 1.0, -1, check_multimap)
else
rspamd_config:register_callback_symbol('MULTIMAP', 1.0, check_multimap)
end
end
end
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