mirror of
https://github.com/rspamd/rspamd.git
synced 2024-09-13 23:56:50 +02:00
197 lines
5.8 KiB
Lua
197 lines
5.8 KiB
Lua
--[[
|
|
Copyright (c) 2018, Vsevolod Stakhov <vsevolod@highsecure.ru>
|
|
|
|
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 kaspersky
|
|
-- This module contains kaspersky antivirus access functions
|
|
--]]
|
|
|
|
local lua_util = require "lua_util"
|
|
local tcp = require "rspamd_tcp"
|
|
local upstream_list = require "rspamd_upstream_list"
|
|
local rspamd_util = require "rspamd_util"
|
|
local rspamd_logger = require "rspamd_logger"
|
|
local common = require "lua_scanners/common"
|
|
|
|
local module_name = "kaspersky"
|
|
|
|
local default_message = '${SCANNER}: virus found: "${VIRUS}"'
|
|
|
|
local function kaspersky_config(opts)
|
|
local kaspersky_conf = {
|
|
module_name = module_name,
|
|
scan_mime_parts = true,
|
|
scan_text_mime = false,
|
|
scan_image_mime = false,
|
|
product_id = 0,
|
|
log_clean = false,
|
|
timeout = 5.0,
|
|
retransmits = 1, -- use local files, retransmits are useless
|
|
cache_expire = 3600, -- expire redis in one hour
|
|
message = default_message,
|
|
detection_category = "virus",
|
|
tmpdir = '/tmp',
|
|
}
|
|
|
|
kaspersky_conf = lua_util.override_defaults(kaspersky_conf, opts)
|
|
|
|
if not kaspersky_conf.prefix then
|
|
kaspersky_conf.prefix = 'rs_' .. kaspersky_conf.name .. '_'
|
|
end
|
|
|
|
if not kaspersky_conf.log_prefix then
|
|
if kaspersky_conf.name:lower() == kaspersky_conf.type:lower() then
|
|
kaspersky_conf.log_prefix = kaspersky_conf.name
|
|
else
|
|
kaspersky_conf.log_prefix = kaspersky_conf.name .. ' (' .. kaspersky_conf.type .. ')'
|
|
end
|
|
end
|
|
|
|
if not kaspersky_conf['servers'] then
|
|
rspamd_logger.errx(rspamd_config, 'no servers defined')
|
|
|
|
return nil
|
|
end
|
|
|
|
kaspersky_conf['upstreams'] = upstream_list.create(rspamd_config,
|
|
kaspersky_conf['servers'], 0)
|
|
|
|
if kaspersky_conf['upstreams'] then
|
|
lua_util.add_debug_alias('antivirus', kaspersky_conf.module_name)
|
|
return kaspersky_conf
|
|
end
|
|
|
|
rspamd_logger.errx(rspamd_config, 'cannot parse servers %s',
|
|
kaspersky_conf['servers'])
|
|
return nil
|
|
end
|
|
|
|
local function kaspersky_check(task, content, digest, rule)
|
|
local function kaspersky_check_uncached ()
|
|
local upstream = rule.upstreams:get_upstream_round_robin()
|
|
local addr = upstream:get_addr()
|
|
local retransmits = rule.retransmits
|
|
local fname = string.format('%s/%s.tmp',
|
|
rule.tmpdir, rspamd_util.random_hex(32))
|
|
local message_fd = rspamd_util.create_file(fname)
|
|
local clamav_compat_cmd = string.format("nSCAN %s\n", fname)
|
|
|
|
if not message_fd then
|
|
rspamd_logger.errx('cannot store file for kaspersky scan: %s', fname)
|
|
return
|
|
end
|
|
|
|
if type(content) == 'string' then
|
|
-- Create rspamd_text
|
|
local rspamd_text = require "rspamd_text"
|
|
content = rspamd_text.fromstring(content)
|
|
end
|
|
content:save_in_file(message_fd)
|
|
|
|
-- Ensure file cleanup
|
|
task:get_mempool():add_destructor(function()
|
|
os.remove(fname)
|
|
rspamd_util.close_file(message_fd)
|
|
end)
|
|
|
|
|
|
local function kaspersky_callback(err, data)
|
|
if err then
|
|
-- set current upstream to fail because an error occurred
|
|
upstream:fail()
|
|
|
|
-- retry with another upstream until retransmits exceeds
|
|
if retransmits > 0 then
|
|
|
|
retransmits = retransmits - 1
|
|
|
|
-- Select a different upstream!
|
|
upstream = rule.upstreams:get_upstream_round_robin()
|
|
addr = upstream:get_addr()
|
|
|
|
lua_util.debugm(rule.module_name, task,
|
|
'%s [%s]: retry IP: %s', rule['symbol'], rule['type'], addr)
|
|
|
|
tcp.request({
|
|
task = task,
|
|
host = addr:to_string(),
|
|
port = addr:get_port(),
|
|
timeout = rule['timeout'],
|
|
callback = kaspersky_callback,
|
|
data = { clamav_compat_cmd },
|
|
stop_pattern = '\n'
|
|
})
|
|
else
|
|
rspamd_logger.errx(task,
|
|
'%s [%s]: failed to scan, maximum retransmits exceed',
|
|
rule['symbol'], rule['type'])
|
|
task:insert_result(rule['symbol_fail'], 0.0,
|
|
'failed to scan and retransmits exceed')
|
|
end
|
|
|
|
else
|
|
upstream:ok()
|
|
data = tostring(data)
|
|
local cached
|
|
lua_util.debugm(rule.module_name, task, '%s [%s]: got reply: %s',
|
|
rule['symbol'], rule['type'], data)
|
|
if data == 'stream: OK' or data == fname .. ': OK' then
|
|
cached = 'OK'
|
|
common.log_clean(task, rule)
|
|
else
|
|
local vname = string.match(data, ': (.+) FOUND')
|
|
if vname then
|
|
common.yield_result(task, rule, vname)
|
|
cached = vname
|
|
else
|
|
rspamd_logger.errx(task, 'unhandled response: %s', data)
|
|
task:insert_result(rule['symbol_fail'], 0.0, 'unhandled response')
|
|
end
|
|
end
|
|
if cached then
|
|
common.save_av_cache(task, digest, rule, cached)
|
|
end
|
|
end
|
|
end
|
|
|
|
tcp.request({
|
|
task = task,
|
|
host = addr:to_string(),
|
|
port = addr:get_port(),
|
|
timeout = rule['timeout'],
|
|
callback = kaspersky_callback,
|
|
data = { clamav_compat_cmd },
|
|
stop_pattern = '\n'
|
|
})
|
|
end
|
|
|
|
if common.need_av_check(task, content, rule) then
|
|
if common.check_av_cache(task, digest, rule, kaspersky_check_uncached) then
|
|
return
|
|
else
|
|
kaspersky_check_uncached()
|
|
end
|
|
end
|
|
end
|
|
|
|
return {
|
|
type = 'antivirus',
|
|
description = 'kaspersky antivirus',
|
|
configure = kaspersky_config,
|
|
check = kaspersky_check,
|
|
name = module_name
|
|
}
|