mirror of
https://github.com/rspamd/rspamd.git
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189 lines
6.1 KiB
Lua
189 lines
6.1 KiB
Lua
--[[
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Copyright (c) 2018, Vsevolod Stakhov <vsevolod@highsecure.ru>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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]]--
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--[[[
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-- @module savapi
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-- This module contains avira savapi antivirus access functions
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--]]
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local lua_util = require "lua_util"
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local tcp = require "rspamd_tcp"
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local upstream_list = require "rspamd_upstream_list"
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local rspamd_logger = require "rspamd_logger"
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local common = require "lua_scanners/common"
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local N = "sophos"
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local default_message = '${SCANNER}: virus found: "${VIRUS}"'
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local function sophos_config(opts)
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local sophos_conf = {
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name = N,
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scan_mime_parts = true,
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scan_text_mime = false,
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scan_image_mime = false,
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default_port = 4010,
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timeout = 15.0,
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log_clean = false,
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retransmits = 2,
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cache_expire = 3600, -- expire redis in one hour
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message = default_message,
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detection_category = "virus",
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}
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sophos_conf = lua_util.override_defaults(sophos_conf, opts)
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if not sophos_conf.prefix then
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sophos_conf.prefix = 'rs_' .. sophos_conf.name .. '_'
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end
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if not sophos_conf.log_prefix then
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if sophos_conf.name:lower() == sophos_conf.type:lower() then
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sophos_conf.log_prefix = sophos_conf.name
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else
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sophos_conf.log_prefix = sophos_conf.name .. ' (' .. sophos_conf.type .. ')'
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end
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end
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if not sophos_conf['servers'] then
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rspamd_logger.errx(rspamd_config, 'no servers defined')
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return nil
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end
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sophos_conf['upstreams'] = upstream_list.create(rspamd_config,
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sophos_conf['servers'],
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sophos_conf.default_port)
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if sophos_conf['upstreams'] then
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lua_util.add_debug_alias('antivirus', sophos_conf.name)
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return sophos_conf
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end
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rspamd_logger.errx(rspamd_config, 'cannot parse servers %s',
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sophos_conf['servers'])
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return nil
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end
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local function sophos_check(task, content, digest, rule)
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local function sophos_check_uncached ()
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local upstream = rule.upstreams:get_upstream_round_robin()
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local addr = upstream:get_addr()
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local retransmits = rule.retransmits
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local protocol = 'SSSP/1.0\n'
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local streamsize = string.format('SCANDATA %d\n', #content)
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local bye = 'BYE\n'
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local function sophos_callback(err, data, conn)
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if err then
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-- set current upstream to fail because an error occurred
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upstream:fail()
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-- retry with another upstream until retransmits exceeds
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if retransmits > 0 then
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retransmits = retransmits - 1
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-- Select a different upstream!
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upstream = rule.upstreams:get_upstream_round_robin()
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addr = upstream:get_addr()
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lua_util.debugm(rule.name, task, '%s: error: %s; retry IP: %s; retries left: %s',
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rule.log_prefix, err, addr, retransmits)
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tcp.request({
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task = task,
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host = addr:to_string(),
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port = addr:get_port(),
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timeout = rule['timeout'],
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callback = sophos_callback,
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data = { protocol, streamsize, content, bye }
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})
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else
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rspamd_logger.errx(task, '%s [%s]: failed to scan, maximum retransmits exceed', rule['symbol'], rule['type'])
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common.yield_result(task, rule, 'failed to scan and retransmits exceed', 0.0, 'fail')
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end
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else
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upstream:ok()
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data = tostring(data)
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lua_util.debugm(rule.name, task,
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'%s [%s]: got reply: %s', rule['symbol'], rule['type'], data)
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local vname = string.match(data, 'VIRUS (%S+) ')
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local cached
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if vname then
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common.yield_result(task, rule, vname)
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common.save_cache(task, digest, rule, vname)
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else
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if string.find(data, 'DONE OK') then
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if rule['log_clean'] then
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rspamd_logger.infox(task, '%s: message or mime_part is clean', rule.log_prefix)
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else
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lua_util.debugm(rule.name, task,
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'%s: message or mime_part is clean', rule.log_prefix)
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end
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cached = 'OK'
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-- not finished - continue
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elseif string.find(data, 'ACC') or string.find(data, 'OK SSSP') then
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conn:add_read(sophos_callback)
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elseif string.find(data, 'FAIL 0212') then
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rspamd_logger.warnx(task, 'Message is encrypted (FAIL 0212): %s', data)
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common.yield_result(task, rule, 'SAVDI: Message is encrypted (FAIL 0212)', 0.0, 'fail')
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cached = 'ENCRYPTED'
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elseif string.find(data, 'REJ 4') then
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rspamd_logger.warnx(task, 'Message is oversized (REJ 4): %s', data)
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common.yield_result(task, rule, 'SAVDI: Message oversized (REJ 4)', 0.0, 'fail')
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-- excplicitly set REJ1 message when SAVDIreports a protocol error
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elseif string.find(data, 'REJ 1') then
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rspamd_logger.errx(task, 'SAVDI (Protocol error (REJ 1)): %s', data)
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common.yield_result(task, rule, 'SAVDI: Protocol error (REJ 1)', 0.0, 'fail')
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else
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rspamd_logger.errx(task, 'unhandled response: %s', data)
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common.yield_result(task, rule, 'unhandled response: ' .. data, 0.0, 'fail')
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end
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if cached then
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common.save_cache(task, digest, rule, cached)
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end
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end
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end
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end
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tcp.request({
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task = task,
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host = addr:to_string(),
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port = addr:get_port(),
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timeout = rule['timeout'],
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callback = sophos_callback,
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data = { protocol, streamsize, content, bye }
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})
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end
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if common.condition_check_and_continue(task, content, rule, digest, sophos_check_uncached) then
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return
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else
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sophos_check_uncached()
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end
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end
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return {
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type = 'antivirus',
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description = 'sophos antivirus',
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configure = sophos_config,
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check = sophos_check,
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name = N
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}
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