diff options
Diffstat (limited to 'lualib/lua_scanners/fprot.lua')
| -rw-r--r-- | lualib/lua_scanners/fprot.lua | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/lualib/lua_scanners/fprot.lua b/lualib/lua_scanners/fprot.lua new file mode 100644 index 0000000..5a469c3 --- /dev/null +++ b/lualib/lua_scanners/fprot.lua @@ -0,0 +1,181 @@ +--[[ +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 +} |