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--[[
Copyright (c) 2022, Vsevolod Stakhov <vsevolod@rspamd.com>
Copyright (c) 2019, Denis Paavilainen <denpa@denpa.pro>
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 p0f
-- This module contains p0f access functions
--]]
local tcp = require "rspamd_tcp"
local rspamd_util = require "rspamd_util"
local rspamd_logger = require "rspamd_logger"
local lua_redis = require "lua_redis"
local lua_util = require "lua_util"
local common = require "lua_scanners/common"
-- SEE: https://github.com/p0f/p0f/blob/v3.06b/docs/README#L317
local S = {
BAD_QUERY = 0x0,
OK = 0x10,
NO_MATCH = 0x20
}
local N = 'p0f'
local function p0f_check(task, ip, rule)
local function ip2bin(addr)
addr = addr:to_table()
for k, v in ipairs(addr) do
addr[k] = rspamd_util.pack('B', v)
end
return table.concat(addr)
end
local function trim(...)
local vars = { ... }
for k, v in ipairs(vars) do
-- skip numbers, trim only strings
if tonumber(vars[k]) == nil then
vars[k] = string.gsub(v, '[^%w-_\\.\\(\\) ]', '')
end
end
return lua_util.unpack(vars)
end
local function parse_p0f_response(data)
--[[
p0f_api_response[232]: magic, status, first_seen, last_seen, total_conn,
uptime_min, up_mod_days, last_nat, last_chg, distance, bad_sw, os_match_q,
os_name, os_flavor, http_name, http_flavor, link_type, language
]]--
data = tostring(data)
-- API response must be 232 bytes long
if #data ~= 232 then
rspamd_logger.errx(task, 'malformed response from p0f on %s, %s bytes',
rule.socket, #data)
common.yield_result(task, rule, 'Malformed Response: ' .. rule.socket,
0.0, 'fail')
return
end
local _, status, _, _, _, uptime_min, _, _, _, distance, _, _, os_name,
os_flavor, _, _, link_type, _ = trim(rspamd_util.unpack(
'I4I4I4I4I4I4I4I4I4hbbc32c32c32c32c32c32', data))
if status ~= S.OK then
if status == S.BAD_QUERY then
rspamd_logger.errx(task, 'malformed p0f query on %s', rule.socket)
common.yield_result(task, rule, 'Malformed Query: ' .. rule.socket,
0.0, 'fail')
end
return
end
local os_string = #os_name == 0 and 'unknown' or os_name .. ' ' .. os_flavor
task:get_mempool():set_variable('os_fingerprint', os_string, link_type,
uptime_min, distance)
if link_type and #link_type > 0 then
common.yield_result(task, rule, {
os_string,
'link=' .. link_type,
'distance=' .. distance },
0.0)
else
common.yield_result(task, rule, {
os_string,
'link=unknown',
'distance=' .. distance },
0.0)
end
return data
end
local function make_p0f_request()
local function check_p0f_cb(err, data)
local function redis_set_cb(redis_set_err)
if redis_set_err then
rspamd_logger.errx(task, 'redis received an error: %s', redis_set_err)
end
end
if err then
rspamd_logger.errx(task, 'p0f received an error: %s', err)
common.yield_result(task, rule, 'Error getting result: ' .. err,
0.0, 'fail')
return
end
data = parse_p0f_response(data)
if rule.redis_params and data then
local key = rule.prefix .. ip:to_string()
local ret = lua_redis.redis_make_request(task,
rule.redis_params,
key,
true,
redis_set_cb,
'SETEX',
{ key, tostring(rule.expire), data }
)
if not ret then
rspamd_logger.warnx(task, 'error connecting to redis')
end
end
end
local query = rspamd_util.pack('I4 I1 c16', 0x50304601,
ip:get_version(), ip2bin(ip))
tcp.request({
host = rule.socket,
callback = check_p0f_cb,
data = { query },
task = task,
timeout = rule.timeout
})
end
local function redis_get_cb(err, data)
if err or type(data) ~= 'string' then
make_p0f_request()
else
parse_p0f_response(data)
end
end
local ret = nil
if rule.redis_params then
local key = rule.prefix .. ip:to_string()
ret = lua_redis.redis_make_request(task,
rule.redis_params,
key,
false,
redis_get_cb,
'GET',
{ key }
)
end
if not ret then
make_p0f_request() -- fallback to directly querying p0f
end
end
local function p0f_config(opts)
local p0f_conf = {
name = N,
timeout = 5,
symbol = 'P0F',
symbol_fail = 'P0F_FAIL',
patterns = {},
expire = 7200,
prefix = 'p0f',
detection_category = 'fingerprint',
message = '${SCANNER}: fingerprint matched: "${VIRUS}"'
}
p0f_conf = lua_util.override_defaults(p0f_conf, opts)
p0f_conf.patterns = common.create_regex_table(p0f_conf.patterns)
if not p0f_conf.log_prefix then
p0f_conf.log_prefix = p0f_conf.name
end
if not p0f_conf.socket then
rspamd_logger.errx(rspamd_config, 'no servers defined')
return nil
end
return p0f_conf
end
return {
type = { N, 'fingerprint', 'scanner' },
description = 'passive OS fingerprinter',
configure = p0f_config,
check = p0f_check,
name = N
}
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