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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 kaspersky
- -- This module contains kaspersky antivirus access functions
- --]]
-
- local lua_util = require "lua_util"
- local tcp = require "rspamd_tcp"
- local upstream_list = require "rspamd_upstream_list"
- local rspamd_util = require "rspamd_util"
- local rspamd_logger = require "rspamd_logger"
- local common = require "lua_scanners/common"
-
- local N = "kaspersky"
-
- local default_message = '${SCANNER}: virus found: "${VIRUS}"'
-
- local function kaspersky_config(opts)
- local kaspersky_conf = {
- name = N,
- scan_mime_parts = true,
- scan_text_mime = false,
- scan_image_mime = false,
- product_id = 0,
- log_clean = false,
- timeout = 5.0,
- retransmits = 1, -- use local files, retransmits are useless
- cache_expire = 3600, -- expire redis in one hour
- message = default_message,
- detection_category = "virus",
- tmpdir = '/tmp',
- }
-
- kaspersky_conf = lua_util.override_defaults(kaspersky_conf, opts)
-
- if not kaspersky_conf.prefix then
- kaspersky_conf.prefix = 'rs_' .. kaspersky_conf.name .. '_'
- end
-
- if not kaspersky_conf.log_prefix then
- if kaspersky_conf.name:lower() == kaspersky_conf.type:lower() then
- kaspersky_conf.log_prefix = kaspersky_conf.name
- else
- kaspersky_conf.log_prefix = kaspersky_conf.name .. ' (' .. kaspersky_conf.type .. ')'
- end
- end
-
- if not kaspersky_conf['servers'] then
- rspamd_logger.errx(rspamd_config, 'no servers defined')
-
- return nil
- end
-
- kaspersky_conf['upstreams'] = upstream_list.create(rspamd_config,
- kaspersky_conf['servers'], 0)
-
- if kaspersky_conf['upstreams'] then
- lua_util.add_debug_alias('antivirus', kaspersky_conf.name)
- return kaspersky_conf
- end
-
- rspamd_logger.errx(rspamd_config, 'cannot parse servers %s',
- kaspersky_conf['servers'])
- return nil
- end
-
- local function kaspersky_check(task, content, digest, rule, maybe_part)
- local function kaspersky_check_uncached ()
- local upstream = rule.upstreams:get_upstream_round_robin()
- local addr = upstream:get_addr()
- local retransmits = rule.retransmits
- local fname = string.format('%s/%s.tmp',
- rule.tmpdir, rspamd_util.random_hex(32))
- local message_fd = rspamd_util.create_file(fname)
- local clamav_compat_cmd = string.format("nSCAN %s\n", fname)
-
- if not message_fd then
- rspamd_logger.errx('cannot store file for kaspersky scan: %s', fname)
- return
- end
-
- if type(content) == 'string' then
- -- Create rspamd_text
- local rspamd_text = require "rspamd_text"
- content = rspamd_text.fromstring(content)
- end
- content:save_in_file(message_fd)
-
- -- Ensure file cleanup
- task:get_mempool():add_destructor(function()
- os.remove(fname)
- rspamd_util.close_file(message_fd)
- end)
-
-
- local function kaspersky_callback(err, data)
- 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 = kaspersky_callback,
- data = { clamav_compat_cmd },
- 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
- lua_util.debugm(rule.name, task,
- '%s [%s]: got reply: %s',
- rule['symbol'], rule['type'], data)
- if data == 'stream: OK' or data == fname .. ': OK' then
- cached = 'OK'
- common.log_clean(task, rule)
- else
- local vname = string.match(data, ': (.+) FOUND')
- if vname then
- common.yield_result(task, rule, vname, 1.0, nil, maybe_part)
- cached = vname
- else
- rspamd_logger.errx(task, 'unhandled response: %s', data)
- common.yield_result(task, rule, 'unhandled response',
- 0.0, 'fail', maybe_part)
- 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(),
- timeout = rule['timeout'],
- callback = kaspersky_callback,
- data = { clamav_compat_cmd },
- stop_pattern = '\n'
- })
- end
-
- if common.condition_check_and_continue(task, content, rule, digest,
- kaspersky_check_uncached, maybe_part) then
- return
- else
- kaspersky_check_uncached()
- end
-
- end
-
- return {
- type = 'antivirus',
- description = 'kaspersky antivirus',
- configure = kaspersky_config,
- check = kaspersky_check,
- name = N
- }
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