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--[[
Copyright (c) 2022, Vsevolod Stakhov <vsevolod@rspamd.com>
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 fprot
-- This module contains fprot 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 = "fprot"
local default_message = '${SCANNER}: virus found: "${VIRUS}"'
local function fprot_config(opts)
local fprot_conf = {
name = N,
scan_mime_parts = true,
scan_text_mime = false,
scan_image_mime = false,
default_port = 10200,
timeout = 5.0, -- FIXME: this will break task_timeout!
log_clean = false,
detection_category = "virus",
retransmits = 2,
cache_expire = 3600, -- expire redis in one hour
message = default_message,
}
fprot_conf = lua_util.override_defaults(fprot_conf, opts)
if not fprot_conf.prefix then
fprot_conf.prefix = 'rs_' .. fprot_conf.name .. '_'
end
if not fprot_conf.log_prefix then
if fprot_conf.name:lower() == fprot_conf.type:lower() then
fprot_conf.log_prefix = fprot_conf.name
else
fprot_conf.log_prefix = fprot_conf.name .. ' (' .. fprot_conf.type .. ')'
end
end
if not fprot_conf['servers'] then
rspamd_logger.errx(rspamd_config, 'no servers defined')
return nil
end
fprot_conf['upstreams'] = upstream_list.create(rspamd_config,
fprot_conf['servers'],
fprot_conf.default_port)
if fprot_conf['upstreams'] then
lua_util.add_debug_alias('antivirus', fprot_conf.name)
return fprot_conf
end
rspamd_logger.errx(rspamd_config, 'cannot parse servers %s',
fprot_conf['servers'])
return nil
end
local function fprot_check(task, content, digest, rule, maybe_part)
local function fprot_check_uncached ()
local upstream = rule.upstreams:get_upstream_round_robin()
local addr = upstream:get_addr()
local retransmits = rule.retransmits
local scan_id = task:get_queue_id()
if not scan_id then
scan_id = task:get_uid()
end
local header = string.format('SCAN STREAM %s SIZE %d\n', scan_id,
#content)
local footer = '\n'
local function fprot_callback(err, data)
if err then
-- 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(),
upstream = upstream,
timeout = rule['timeout'],
callback = fprot_callback,
data = { header, content, footer },
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
local clean = string.match(data, '^0 <clean>')
if clean then
cached = 'OK'
if rule['log_clean'] then
rspamd_logger.infox(task,
'%s [%s]: message or mime_part is clean',
rule['symbol'], rule['type'])
end
else
-- returncodes: 1: infected, 2: suspicious, 3: both, 4-255: some error occurred
-- see http://www.f-prot.com/support/helpfiles/unix/appendix_c.html for more detail
local vname = string.match(data, '^[1-3] <[%w%s]-: (.-)>')
if not vname then
rspamd_logger.errx(task, 'Unhandled response: %s', data)
else
common.yield_result(task, rule, vname, 1.0, nil, maybe_part)
cached = vname
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(),
upstream = upstream,
timeout = rule['timeout'],
callback = fprot_callback,
data = { header, content, footer },
stop_pattern = '\n'
})
end
if common.condition_check_and_continue(task, content, rule, digest,
fprot_check_uncached, maybe_part) then
return
else
fprot_check_uncached()
end
end
return {
type = 'antivirus',
description = 'fprot antivirus',
configure = fprot_config,
check = fprot_check,
name = N
}
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