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--[[
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 N = "kaspersky"
local default_message = '${SCANNER}: virus found: "${VIRUS}"'
local function kaspersky_config(opts)
local kaspersky_conf = {
name = N,
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.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, maybe_part)
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.name, task, '%s: error: %s; retry IP: %s; retries left: %s',
rule.log_prefix, err, addr, retransmits)
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'])
common.yield_result(task, rule,
'failed to scan and retransmits exceed', 0.0, 'fail',
maybe_part)
end
else
upstream:ok()
data = tostring(data)
local cached
lua_util.debugm(rule.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, 1.0, nil, maybe_part)
cached = vname
else
rspamd_logger.errx(task, 'unhandled response: %s', data)
common.yield_result(task, rule, 'unhandled response',
0.0, 'fail', maybe_part)
end
end
if cached then
common.save_cache(task, digest, rule, cached, 1.0, maybe_part)
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.condition_check_and_continue(task, content, rule, digest,
kaspersky_check_uncached, maybe_part) then
return
else
kaspersky_check_uncached()
end
end
return {
type = 'antivirus',
description = 'kaspersky antivirus',
configure = kaspersky_config,
check = kaspersky_check,
name = N
}
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