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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 savapi
-- This module contains avira savapi antivirus access functions
--]]
local lua_util = require "lua_util"
local tcp = require "rspamd_tcp"
local upstream_list = require "rspamd_upstream_list"
local rspamd_logger = require "rspamd_logger"
local common = require "lua_scanners/common"
local N = "sophos"
local default_message = '${SCANNER}: virus found: "${VIRUS}"'
local function sophos_config(opts)
local sophos_conf = {
name = N,
scan_mime_parts = true,
scan_text_mime = false,
scan_image_mime = false,
default_port = 4010,
timeout = 15.0,
log_clean = false,
retransmits = 2,
cache_expire = 3600, -- expire redis in one hour
message = default_message,
detection_category = "virus",
}
sophos_conf = lua_util.override_defaults(sophos_conf, opts)
if not sophos_conf.prefix then
sophos_conf.prefix = 'rs_' .. sophos_conf.name .. '_'
end
if not sophos_conf.log_prefix then
if sophos_conf.name:lower() == sophos_conf.type:lower() then
sophos_conf.log_prefix = sophos_conf.name
else
sophos_conf.log_prefix = sophos_conf.name .. ' (' .. sophos_conf.type .. ')'
end
end
if not sophos_conf['servers'] then
rspamd_logger.errx(rspamd_config, 'no servers defined')
return nil
end
sophos_conf['upstreams'] = upstream_list.create(rspamd_config,
sophos_conf['servers'],
sophos_conf.default_port)
if sophos_conf['upstreams'] then
lua_util.add_debug_alias('antivirus', sophos_conf.name)
return sophos_conf
end
rspamd_logger.errx(rspamd_config, 'cannot parse servers %s',
sophos_conf['servers'])
return nil
end
local function sophos_check(task, content, digest, rule)
local function sophos_check_uncached ()
local upstream = rule.upstreams:get_upstream_round_robin()
local addr = upstream:get_addr()
local retransmits = rule.retransmits
local protocol = 'SSSP/1.0\n'
local streamsize = string.format('SCANDATA %d\n', #content)
local bye = 'BYE\n'
local function sophos_callback(err, data, conn)
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 = sophos_callback,
data = { protocol, streamsize, content, bye }
})
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')
end
else
upstream:ok()
data = tostring(data)
lua_util.debugm(rule.name, task,
'%s [%s]: got reply: %s', rule['symbol'], rule['type'], data)
local vname = string.match(data, 'VIRUS (%S+) ')
local cached
if vname then
common.yield_result(task, rule, vname)
common.save_cache(task, digest, rule, vname)
else
if string.find(data, 'DONE OK') then
if rule['log_clean'] then
rspamd_logger.infox(task, '%s: message or mime_part is clean', rule.log_prefix)
else
lua_util.debugm(rule.name, task,
'%s: message or mime_part is clean', rule.log_prefix)
end
cached = 'OK'
-- not finished - continue
elseif string.find(data, 'ACC') or string.find(data, 'OK SSSP') then
conn:add_read(sophos_callback)
elseif string.find(data, 'FAIL 0212') then
rspamd_logger.warnx(task, 'Message is encrypted (FAIL 0212): %s', data)
common.yield_result(task, rule, 'SAVDI: Message is encrypted (FAIL 0212)', 0.0, 'fail')
cached = 'ENCRYPTED'
elseif string.find(data, 'REJ 4') then
rspamd_logger.warnx(task, 'Message is oversized (REJ 4): %s', data)
common.yield_result(task, rule, 'SAVDI: Message oversized (REJ 4)', 0.0, 'fail')
-- excplicitly set REJ1 message when SAVDIreports a protocol error
elseif string.find(data, 'REJ 1') then
rspamd_logger.errx(task, 'SAVDI (Protocol error (REJ 1)): %s', data)
common.yield_result(task, rule, 'SAVDI: Protocol error (REJ 1)', 0.0, 'fail')
else
rspamd_logger.errx(task, 'unhandled response: %s', data)
common.yield_result(task, rule, 'unhandled response: ' .. data, 0.0, 'fail')
end
if cached then
common.save_cache(task, digest, rule, cached)
end
end
end
end
tcp.request({
task = task,
host = addr:to_string(),
port = addr:get_port(),
timeout = rule['timeout'],
callback = sophos_callback,
data = { protocol, streamsize, content, bye }
})
end
if common.condition_check_and_continue(task, content, rule, digest, sophos_check_uncached) then
return
else
sophos_check_uncached()
end
end
return {
type = 'antivirus',
description = 'sophos antivirus',
configure = sophos_config,
check = sophos_check,
name = N
}
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