1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
--[[
Copyright (c) 2011-2016, Vsevolod Stakhov <vsevolod@highsecure.ru>
Copyright (c) 2016, Andrew Lewis <nerf@judo.za.org>
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_regexp = require "rspamd_regexp"
local options = {
provider_type = 'cymru',
provider_info = {
ip4 = 'origin.asn.cymru.com',
ip6 = 'origin6.asn.cymru.com',
},
symbol = 'ASN',
}
local cymru_re = rspamd_regexp.create_cached("[\\|\\s]")
local function asn_check(task)
local function asn_set(asn, ipnet, country)
local descr_t = {}
if asn then
task:get_mempool():set_variable("asn", asn)
table.insert(descr_t, "asn:" .. asn)
end
if ipnet then
task:get_mempool():set_variable("ipnet", ipnet)
table.insert(descr_t, "ipnet:" .. ipnet)
end
if country then
task:get_mempool():set_variable("country", country)
table.insert(descr_t, "country:" .. country)
end
if options['symbol'] then
task:insert_result(options['symbol'], 0.0, table.concat(descr_t, ', '))
end
end
local asn_check_func = {}
function asn_check_func.cymru(ip)
local function cymru_dns_cb(resolver, to_resolve, results, err, key)
if not (results and results[1]) then return end
local parts = cymru_re:split(results[1])
-- "15169 | 8.8.8.0/24 | US | arin |" for 8.8.8.8
asn_set(parts[1], parts[2], parts[3])
end
local dnsbl = options['provider_info']['ip' .. ip:get_version()]
local req_name = rspamd_logger.slog("%1.%2",
table.concat(ip:inversed_str_octets(), '.'), dnsbl)
task:get_resolver():resolve_txt(task:get_session(), task:get_mempool(),
req_name, cymru_dns_cb)
end
local ip = task:get_from_ip()
if not (ip and ip:is_valid()) then return end
asn_check_func[options['provider_type']](ip)
end
-- Configuration options
local configure_asn_module = function()
local opts = rspamd_config:get_all_opt('asn')
if opts then
if opts['enabled'] == false then
rspamd_logger.info('Module is disabled')
return
end
for k,v in pairs(opts) do
options[k] = v
end
end
if options['provider_type'] == 'cymru' then
if not options['provider_info'] and options['provider_info']['ip4'] and
options['provider_info']['ip6'] then
rspamd_logger.errx("Missing required provider_info for cymru")
return false
end
else
rspamd_logger.errx("Unknown provider_type: %s", options['provider_type'])
return false
end
return true
end
if configure_asn_module() then
rspamd_config:register_symbol({
name = 'ASN_CHECK',
type = 'prefilter',
callback = asn_check,
priority = 10,
})
end
|
