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|
--[[
Copyright (c) 2016, 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.
]] --
local rspamd_logger = require "rspamd_logger"
local rspamd_util = require "rspamd_util"
local rspamd_regexp = require "rspamd_regexp"
local tcp = require "rspamd_tcp"
local upstream_list = require "rspamd_upstream_list"
local lua_util = require "lua_util"
local redis_params
local N = "antivirus"
if confighelp then
rspamd_config:add_example(nil, 'antivirus',
"Check messages for viruses",
[[
antivirus {
# multiple scanners could be checked, for each we create a configuration block with an arbitrary name
clamav {
# If set force this action if any virus is found (default unset: no action is forced)
# action = "reject";
# if `true` only messages with non-image attachments will be checked (default true)
attachments_only = true;
# If `max_size` is set, messages > n bytes in size are not scanned
max_size = 20000000;
# symbol to add (add it to metric if you want non-zero weight)
symbol = "CLAM_VIRUS";
# type of scanner: "clamav", "fprot", "sophos" or "savapi"
type = "clamav";
# For "savapi" you must also specify the following variable
product_id = 12345;
# You can enable logging for clean messages
log_clean = true;
# servers to query (if port is unspecified, scanner-specific default is used)
# can be specified multiple times to pool servers
# can be set to a path to a unix socket
# Enable this in local.d/antivirus.conf
servers = "127.0.0.1:3310";
# if `patterns` is specified virus name will be matched against provided regexes and the related
# symbol will be yielded if a match is found. If no match is found, default symbol is yielded.
patterns {
# symbol_name = "pattern";
JUST_EICAR = "^Eicar-Test-Signature$";
}
# `whitelist` points to a map of IP addresses. Mail from these addresses is not scanned.
whitelist = "/etc/rspamd/antivirus.wl";
}
}
]])
return
end
local function match_patterns(default_sym, found, patterns)
if type(patterns) ~= 'table' then return default_sym end
if not patterns[1] then
for sym, pat in pairs(patterns) do
if pat:match(found) then
return sym
end
end
return default_sym
else
for _, p in ipairs(patterns) do
for sym, pat in pairs(p) do
if pat:match(found) then
return sym
end
end
end
return default_sym
end
end
local function yield_result(task, rule, vname)
local all_whitelisted = true
if type(vname) == 'string' then
local symname = match_patterns(rule['symbol'], vname, rule['patterns'])
if rule['whitelist'] and rule['whitelist']:get_key(vname) then
rspamd_logger.infox(task, '%s: "%s" is in whitelist', rule['type'], vname)
return
end
task:insert_result(symname, 1.0, vname)
rspamd_logger.infox(task, '%s: virus found: "%s"', rule['type'], vname)
elseif type(vname) == 'table' then
for _, vn in ipairs(vname) do
local symname = match_patterns(rule['symbol'], vn, rule['patterns'])
if rule['whitelist'] and rule['whitelist']:get_key(vn) then
rspamd_logger.infox(task, '%s: "%s" is in whitelist', rule['type'], vn)
else
all_whitelisted = false
task:insert_result(symname, 1.0, vn)
rspamd_logger.infox(task, '%s: virus found: "%s"', rule['type'], vn)
end
end
end
if rule['action'] then
if type(vname) == 'table' then
if all_whitelisted then return end
vname = table.concat(vname, '; ')
end
task:set_pre_result(rule['action'],
string.format('%s: virus found: "%s"', rule['type'], vname))
end
end
local function clamav_config(opts)
local clamav_conf = {
attachments_only = true,
default_port = 3310,
log_clean = false,
timeout = 15.0,
retransmits = 2,
cache_expire = 3600, -- expire redis in one hour
}
for k,v in pairs(opts) do
clamav_conf[k] = v
end
if not clamav_conf.prefix then
clamav_conf.prefix = 'rs_cl'
end
if not clamav_conf['servers'] then
rspamd_logger.errx(rspamd_config, 'no servers defined')
return nil
end
clamav_conf['upstreams'] = upstream_list.create(rspamd_config,
clamav_conf['servers'],
clamav_conf.default_port)
if clamav_conf['upstreams'] then
return clamav_conf
end
rspamd_logger.errx(rspamd_config, 'cannot parse servers %s',
clamav_conf['servers'])
return nil
end
local function fprot_config(opts)
local fprot_conf = {
attachments_only = true,
default_port = 10200,
timeout = 15.0,
log_clean = false,
retransmits = 2,
cache_expire = 3600, -- expire redis in one hour
}
for k,v in pairs(opts) do
fprot_conf[k] = v
end
if not fprot_conf.prefix then
fprot_conf.prefix = 'rs_fp'
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
return fprot_conf
end
rspamd_logger.errx(rspamd_config, 'cannot parse servers %s',
fprot_conf['servers'])
return nil
end
local function sophos_config(opts)
local sophos_conf = {
attachments_only = true,
default_port = 4010,
timeout = 15.0,
log_clean = false,
retransmits = 2,
cache_expire = 3600, -- expire redis in one hour
}
for k,v in pairs(opts) do
sophos_conf[k] = v
end
if not sophos_conf.prefix then
sophos_conf.prefix = 'rs_sp'
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
return sophos_conf
end
rspamd_logger.errx(rspamd_config, 'cannot parse servers %s',
sophos_conf['servers'])
return nil
end
local function savapi_config(opts)
local savapi_conf = {
attachments_only = true,
default_port = 4444, -- note: You must set ListenAddress in savapi.conf
product_id = 0,
log_clean = false,
timeout = 15.0,
retransmits = 2,
cache_expire = 3600, -- expire redis in one hour
}
for k,v in pairs(opts) do
savapi_conf[k] = v
end
if not savapi_conf.prefix then
savapi_conf.prefix = 'rs_ap'
end
if not savapi_conf['servers'] then
rspamd_logger.errx(rspamd_config, 'no servers defined')
return nil
end
savapi_conf['upstreams'] = upstream_list.create(rspamd_config,
savapi_conf['servers'],
savapi_conf.default_port)
if savapi_conf['upstreams'] then
return savapi_conf
end
rspamd_logger.errx(rspamd_config, 'cannot parse servers %s',
savapi_conf['servers'])
return nil
end
local function message_not_too_large(task, rule)
local max_size = tonumber(rule['max_size'])
if not max_size then return true end
if task:get_size() > max_size then
rspamd_logger.infox("skip %s AV check as it is too large: %s (%s is allowed)",
rule.type, task:get_size(), max_size)
return false
end
return true
end
local function need_av_check(task, rule)
if rule['attachments_only'] then
for _,p in ipairs(task:get_parts()) do
if p:get_filename() and not p:is_image() then
return message_not_too_large(task, rule)
end
end
rspamd_logger.infox("skip %s AV check as there are no attachments in a message",
rule.type)
return false
else
return message_not_too_large(task, rule)
end
end
local function check_av_cache(task, rule, fn)
local key = task:get_digest()
local function redis_av_cb(err, data)
if data and type(data) == 'string' then
-- Cached
if data ~= 'OK' then
rspamd_logger.debugm(N, task, 'got cached result for %s: %s', key, data)
data = rspamd_str_split(data, '\x30')
yield_result(task, rule, data)
else
rspamd_logger.debugm(N, task, 'got cached result for %s: %s', key, data)
end
else
if err then
rspamd_logger.errx(task, 'Got error checking cache: %1', err)
end
fn()
end
end
if redis_params then
key = rule['prefix'] .. key
if rspamd_redis_make_request(task,
redis_params, -- connect params
key, -- hash key
false, -- is write
redis_av_cb, --callback
'GET', -- command
{key} -- arguments)
) then
return true
end
end
return false
end
local function save_av_cache(task, rule, to_save)
local key = task:get_digest()
local function redis_set_cb(err)
-- Do nothing
if err then
rspamd_logger.errx(task, 'failed to save virus cache for %s -> "%s": %s',
to_save, key, err)
else
rspamd_logger.debugm(N, task, 'saved cached result for %s: %s', key, to_save)
end
end
if type(to_save) == 'table' then
to_save = table.concat(to_save, '\x30')
end
if redis_params then
key = rule['prefix'] .. key
rspamd_redis_make_request(task,
redis_params, -- connect params
key, -- hash key
true, -- is write
redis_set_cb, --callback
'SETEX', -- command
{ key, rule['cache_expire'], to_save }
)
end
return false
end
local function fprot_check(task, rule)
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, task:get_size())
local footer = '\n'
local function fprot_callback(err, data)
if err then
if err == 'IO timeout' then
if retransmits > 0 then
retransmits = retransmits - 1
tcp.request({
task = task,
host = addr:to_string(),
port = addr:get_port(),
timeout = rule['timeout'],
callback = fprot_callback,
data = { header, task:get_content(), footer },
stop_pattern = '\n'
})
else
rspamd_logger.errx(task, 'failed to scan, maximum retransmits exceed')
upstream:fail()
end
else
rspamd_logger.errx(task, 'failed to scan: %s', err)
upstream:fail()
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 is clean', rule['symbol'], rule['type'])
end
else
-- returncodes: 1: infected, 2: suspicious, 3: both, 4-255: some error occured
-- 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
yield_result(task, rule, vname)
cached = vname
end
end
if cached then
save_av_cache(task, rule, cached)
end
end
end
tcp.request({
task = task,
host = addr:to_string(),
port = addr:get_port(),
timeout = rule['timeout'],
callback = fprot_callback,
data = { header, task:get_content(), footer },
stop_pattern = '\n'
})
end
if need_av_check(task, rule) then
if check_av_cache(task, rule, fprot_check_uncached) then
return
else
fprot_check_uncached()
end
end
end
local function clamav_check(task, rule)
local function clamav_check_uncached ()
local upstream = rule.upstreams:get_upstream_round_robin()
local addr = upstream:get_addr()
local retransmits = rule.retransmits
local header = rspamd_util.pack("c9 c1 >I4", "zINSTREAM", "\0",
task:get_size())
local footer = rspamd_util.pack(">I4", 0)
local function clamav_callback(err, data)
if err then
if err == 'IO timeout' then
if retransmits > 0 then
retransmits = retransmits - 1
tcp.request({
task = task,
host = addr:to_string(),
port = addr:get_port(),
timeout = rule['timeout'],
callback = clamav_callback,
data = { header, task:get_content(), footer },
stop_pattern = '\0'
})
else
rspamd_logger.errx(task, 'failed to scan, maximum retransmits exceed')
upstream:fail()
end
else
rspamd_logger.errx(task, 'failed to scan: %s', err)
upstream:fail()
end
else
upstream:ok()
data = tostring(data)
local cached
rspamd_logger.debugm(N, task, '%s [%s]: got reply: %s', rule['symbol'], rule['type'], data)
if data == 'stream: OK' then
cached = 'OK'
if rule['log_clean'] then
rspamd_logger.infox(task, '%s [%s]: message is clean', rule['symbol'], rule['type'])
else
rspamd_logger.debugm(N, task, '%s [%s]: message is clean', rule['symbol'], rule['type'])
end
else
local vname = string.match(data, 'stream: (.+) FOUND')
if vname then
yield_result(task, rule, vname)
cached = vname
else
rspamd_logger.errx(task, 'unhandled response: %s', data)
end
end
if cached then
save_av_cache(task, rule, cached)
end
end
end
tcp.request({
task = task,
host = addr:to_string(),
port = addr:get_port(),
timeout = rule['timeout'],
callback = clamav_callback,
data = { header, task:get_content(), footer },
stop_pattern = '\0'
})
end
if need_av_check(task, rule) then
if check_av_cache(task, rule, clamav_check_uncached) then
return
else
clamav_check_uncached()
end
end
end
local function sophos_check(task, 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', task:get_size())
local bye = 'BYE\n'
local function sophos_callback(err, data, conn)
if err then
if err == 'IO timeout' then
if retransmits > 0 then
retransmits = retransmits - 1
tcp.request({
task = task,
host = addr:to_string(),
port = addr:get_port(),
timeout = rule['timeout'],
callback = sophos_callback,
data = { protocol, streamsize, task:get_content(), bye }
})
else
rspamd_logger.errx(task, 'failed to scan, maximum retransmits exceed')
upstream:fail()
end
else
rspamd_logger.errx(task, 'failed to scan: %s', err)
upstream:fail()
end
else
upstream:ok()
data = tostring(data)
local vname = string.match(data, 'VIRUS (%S+) ')
if vname then
yield_result(task, rule, vname)
save_av_cache(task, rule, vname)
else
if string.find(data, 'DONE OK') then
if rule['log_clean'] then
rspamd_logger.infox(task, '%s [%s]: message is clean', rule['symbol'], rule['type'])
end
save_av_cache(task, rule, 'OK')
elseif string.find(data, 'FAIL 0212') then
if rule['savdi_report_encrypted'] then
rspamd_logger.infox(task, 'Message is ENCRYPTED (0212 SOPHOS_SAVI_ERROR_FILE_ENCRYPTED): %s', data)
yield_result(task, rule, "SAVDI_FILE_ENCRYPTED")
save_av_cache(task, rule, "SAVDI_FILE_ENCRYPTED")
end
elseif string.find(data, 'REJ 4') then
if rule['savdi_report_oversize'] then
rspamd_logger.infox(task, 'Message is OVERSIZED (SSSP reject code 4): %s', data)
yield_result(task, rule, "SAVDI_FILE_OVERSIZED")
save_av_cache(task, rule, "SAVDI_FILE_OVERSIZED")
end
elseif string.find(data, 'REJ 1') then
rspamd_logger.errx(task, 'SAVDI (Protocol error (REJ 1)): %s', data)
elseif string.find(data, 'ACC') or string.find(data, 'OK SSSP') then
conn:add_read(sophos_callback)
else
rspamd_logger.errx(task, 'unhandled response: %s', data)
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, task:get_content(), bye }
})
end
if need_av_check(task, rule) then
if check_av_cache(task, rule, sophos_check_uncached) then
return
else
sophos_check_uncached()
end
end
end
local function savapi_check(task, rule)
local function savapi_check_uncached ()
local upstream = rule.upstreams:get_upstream_round_robin()
local addr = upstream:get_addr()
local retransmits = rule.retransmits
local message_file = task:store_in_file(tonumber("0644", 8))
local vnames = {}
-- Forward declaration for recursive calls
local savapi_scan1_cb
local function savapi_fin_cb(err, conn)
local vnames_reordered = {}
-- Swap table
for virus,_ in pairs(vnames) do
table.insert(vnames_reordered, virus)
end
rspamd_logger.debugm(N, task, "%s: number of virus names found %s", rule['type'], #vnames_reordered)
if #vnames_reordered > 0 then
local vname = {}
for _,virus in ipairs(vnames_reordered) do
table.insert(vname, virus)
end
yield_result(task, rule, vname)
save_av_cache(task, rule, vname)
end
if conn then
conn:close()
end
end
local function savapi_scan2_cb(err, data, conn)
local result = tostring(data)
rspamd_logger.debugm(N, task, "%s: got reply: %s", rule['type'], result)
-- Terminal response - clean
if string.find(result, '200') or string.find(result, '210') then
if rule['log_clean'] then
rspamd_logger.infox(task, '%s: message is clean', rule['type'])
end
save_av_cache(task, rule, 'OK')
conn:add_write(savapi_fin_cb, 'QUIT\n')
-- Terminal response - infected
elseif string.find(result, '319') then
conn:add_write(savapi_fin_cb, 'QUIT\n')
-- Non-terminal response
elseif string.find(result, '310') then
local virus
virus = result:match "310.*<<<%s(.*)%s+;.*;.*"
if not virus then
virus = result:match "310%s(.*)%s+;.*;.*"
if not virus then
rspamd_logger.errx(task, "%s: virus result unparseable: %s", rule['type'], result)
return
end
end
-- Store unique virus names
vnames[virus] = 1
-- More content is expected
conn:add_write(savapi_scan1_cb, '\n')
end
end
savapi_scan1_cb = function(err, conn)
conn:add_read(savapi_scan2_cb, '\n')
end
-- 100 PRODUCT:xyz
local function savapi_greet2_cb(err, data, conn)
local result = tostring(data)
if string.find(result, '100 PRODUCT') then
rspamd_logger.debugm(N, task, "%s: scanning file: %s", rule['type'], message_file)
conn:add_write(savapi_scan1_cb, {string.format('SCAN %s\n', message_file)})
else
rspamd_logger.errx(task, '%s: invalid product id %s', rule['type'], rule['product_id'])
conn:add_write(savapi_fin_cb, 'QUIT\n')
end
end
local function savapi_greet1_cb(err, conn)
conn:add_read(savapi_greet2_cb, '\n')
end
local function savapi_callback_init(err, data, conn)
if err then
if err == 'IO timeout' then
if retransmits > 0 then
retransmits = retransmits - 1
tcp.request({
task = task,
host = addr:to_string(),
port = addr:get_port(),
timeout = rule['timeout'],
callback = savapi_callback_init,
stop_pattern = {'\n'},
})
else
rspamd_logger.errx(task, 'failed to scan, maximum retransmits exceed')
upstream:fail()
end
else
rspamd_logger.errx(task, 'failed to scan: %s', err)
upstream:fail()
end
else
upstream:ok()
local result = tostring(data)
-- 100 SAVAPI:4.0 greeting
if string.find(result, '100') then
conn:add_write(savapi_greet1_cb, {string.format('SET PRODUCT %s\n', rule['product_id'])})
end
end
end
tcp.request({
task = task,
host = addr:to_string(),
port = addr:get_port(),
timeout = rule['timeout'],
callback = savapi_callback_init,
stop_pattern = {'\n'},
})
end
if need_av_check(task, rule) then
if check_av_cache(task, rule, savapi_check_uncached) then
return
else
savapi_check_uncached()
end
end
end
local av_types = {
clamav = {
configure = clamav_config,
check = clamav_check
},
fprot = {
configure = fprot_config,
check = fprot_check
},
sophos = {
configure = sophos_config,
check = sophos_check
},
savapi = {
configure = savapi_config,
check = savapi_check
},
}
local function add_antivirus_rule(sym, opts)
if not opts['type'] then
return nil
end
if not opts['symbol'] then opts['symbol'] = sym end
local cfg = av_types[opts['type']]
if not cfg then
rspamd_logger.errx(rspamd_config, 'unknown antivirus type: %s',
opts['type'])
end
local rule = cfg.configure(opts)
rule.type = opts.type
if not rule then
rspamd_logger.errx(rspamd_config, 'cannot configure %s for %s',
opts['type'], opts['symbol'])
return nil
end
if type(opts['patterns']) == 'table' then
rule['patterns'] = {}
if opts['patterns'][1] then
for i, p in ipairs(opts['patterns']) do
if type(p) == 'table' then
local new_set = {}
for k, v in pairs(p) do
new_set[k] = rspamd_regexp.create_cached(v)
end
rule['patterns'][i] = new_set
else
rule['patterns'][i] = {}
end
end
else
for k, v in pairs(opts['patterns']) do
rule['patterns'][k] = rspamd_regexp.create_cached(v)
end
end
end
if opts['whitelist'] then
rule['whitelist'] = rspamd_config:add_hash_map(opts['whitelist'])
end
return function(task)
return cfg.check(task, rule)
end
end
-- Registration
local opts = rspamd_config:get_all_opt('antivirus')
if opts and type(opts) == 'table' then
redis_params = rspamd_parse_redis_server('antivirus')
local has_valid = false
for k, m in pairs(opts) do
if type(m) == 'table' and m['type'] and m['servers'] then
local cb = add_antivirus_rule(k, m)
if not cb then
rspamd_logger.errx(rspamd_config, 'cannot add rule: "' .. k .. '"')
else
local id = rspamd_config:register_symbol({
type = 'normal',
name = m['symbol'],
callback = cb,
})
has_valid = true
if type(m['patterns']) == 'table' then
if m['patterns'][1] then
for _, p in ipairs(m['patterns']) do
if type(p) == 'table' then
for sym in pairs(p) do
rspamd_config:register_symbol({
type = 'virtual',
name = sym,
parent = id
})
end
end
end
else
for sym in pairs(m['patterns']) do
rspamd_config:register_symbol({
type = 'virtual',
name = sym,
parent = id
})
end
end
end
if m['score'] then
-- Register metric symbol
local description = 'antivirus symbol'
local group = 'antivirus'
if m['description'] then
description = m['description']
end
if m['group'] then
group = m['group']
end
rspamd_config:set_metric_symbol({
name = m['symbol'],
score = m['score'],
description = description,
group = group
})
end
end
end
end
if not has_valid then
lua_util.disable_module(N, 'config')
end
end
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