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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 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, maybe_part)
- 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
- -- 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 = 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', maybe_part)
- end
- else
- 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, 1.0, nil, maybe_part)
- common.save_cache(task, digest, rule, vname, 1.0, maybe_part)
- 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, 'encrypted', maybe_part)
- 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', maybe_part)
- -- explicitly 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', maybe_part)
- else
- rspamd_logger.errx(task, 'unhandled response: %s', data)
- common.yield_result(task, rule, 'unhandled response: ' .. data,
- 0.0, 'fail', maybe_part)
- end
- if cached then
- common.save_cache(task, digest, rule, cached, 1.0, maybe_part)
- end
- end
- end
- end
-
- tcp.request({
- task = task,
- host = addr:to_string(),
- port = addr:get_port(),
- upstream = upstream,
- 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, maybe_part) 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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