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-- Multimap is rspamd module designed to define and operate with different maps
local rules = {}
function split(str, delim, maxNb)
-- Eliminate bad cases...
if string.find(str, delim) == nil then
return { str }
end
if maxNb == nil or maxNb < 1 then
maxNb = 0 -- No limit
end
local result = {}
local pat = "(.-)" .. delim .. "()"
local nb = 0
local lastPos
for part, pos in string.gfind(str, pat) do
nb = nb + 1
result[nb] = part
lastPos = pos
if nb == maxNb then break end
end
-- Handle the last field
if nb ~= maxNb then
result[nb + 1] = string.sub(str, lastPos)
end
return result
end
function multimap_rbl_cb(task, to_resolve, results, err)
if results then
local _,_,o4,o3,o2,o1,in_rbl = string.find(to_resolve, '(%d+)%.(%d+)%.(%d+)%.(%d+)%.(.+)')
-- Get corresponding rule by rbl name
for _,rule in ipairs(rules) do
if rule['map'] == in_rbl then
task:insert_result(rule['symbol'], 1, rule['map'])
return
end
end
end
end
function check_multimap(task)
for _,rule in ipairs(rules) do
if rule['type'] == 'ip' then
local ip = task:get_from_ip_num()
if rule['ips']:get_key(ip) then
task:insert_result(rule['symbol'], 1)
end
elseif rule['type'] == 'header' then
local headers = task:get_message():get_header(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, rule['pattern'])
if ext then
if rule['hash']:get_key(ext) then
task:insert_result(rule['symbol'], 1)
end
end
else
if rule['hash']:get_key(hv) then
task:insert_result(rule['symbol'], 1)
end
end
end
end
elseif rule['type'] == 'dnsbl' then
local ip = task:get_from_ip()
if ip then
local _,_,o1,o2,o3,o4 = string.find(ip, '(%d+)%.(%d+)%.(%d+)%.(%d+)')
local rbl_str = o4 .. '.' .. o3 .. '.' .. o2 .. '.' .. o1 .. '.' .. rule['map']
task:resolve_dns_a(rbl_str, 'multimap_rbl_cb')
end
end
end
end
local function add_multimap_rule(params)
local newrule = {
type = 'ip',
header = nil,
pattern = nil,
map = nil,
symbol = nil
}
for _,param in ipairs(params) do
local _,_,name,value = string.find(param, '(%w+)%s*=%s*(.+)')
if not name or not value then
rspamd_logger:err('invalid rule: '..param)
return nil
end
if name == 'type' then
if value == 'ip' then
newrule['type'] = 'ip'
elseif value == 'dnsbl' then
newrule['type'] = 'dnsbl'
elseif value == 'header' then
newrule['type'] = 'header'
else
rspamd_logger:err('invalid rule type: '.. value)
return nil
end
elseif name == 'header' then
newrule['header'] = value
elseif name == 'pattern' then
newrule['pattern'] = value
elseif name == 'map' then
newrule['map'] = value
elseif name == 'symbol' then
newrule['symbol'] = value
else
rspamd_logger:err('invalid rule option: '.. name)
return nil
end
end
if not newrule['symbol'] or not newrule['map'] or not newrule['symbol'] then
rspamd_logger:err('incomplete rule')
return nil
end
if newrule['type'] == 'ip' then
newrule['ips'] = rspamd_config:add_radix_map (newrule['map'])
elseif newrule['type'] == 'header' then
newrule['hash'] = rspamd_config:add_hash_map (newrule['map'])
end
table.insert(rules, newrule)
return newrule
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 then
local strrules = opts['rule']
if strrules then
if type(strrules) == 'table' then
for _,value in ipairs(strrules) do
local params = split(value, ',')
local rule = add_multimap_rule (params)
if not rule then
rspamd_logger:err('cannot add rule: "'..value..'"')
else
if type(rspamd_config.get_api_version) ~= 'nil' then
rspamd_config:register_virtual_symbol(rule['symbol'], 1.0)
end
end
end
elseif type(strrules) == 'string' then
local params = split(strrules, ',')
local rule = add_multimap_rule (params)
if not rule then
rspamd_logger:err('cannot add rule: "'..strrules..'"')
else
if type(rspamd_config.get_api_version) ~= 'nil' then
rspamd_config:register_virtual_symbol(rule['symbol'], 1.0)
end
end
end
end
end
if table.maxn(rules) > 0 then
-- add fake symbol to check all maps inside a single callback
if type(rspamd_config.get_api_version) ~= 'nil' then
rspamd_config:register_callback_symbol('MULTIMAP', 1.0, 'check_multimap')
else
rspamd_config:register_symbol('MULTIMAP', 1.0, 'check_multimap')
end
end
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