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
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
-- Multimap is rspamd module designed to define and operate with different maps
local rules = {}
function split(str, delim, maxNb)
-- Eliminate bad cases...
if string.find(str, delim) == nil then
return { str }
end
if maxNb == nil or maxNb < 1 then
maxNb = 0 -- No limit
end
local result = {}
local pat = "(.-)" .. delim .. "()"
local nb = 0
local lastPos
for part, pos in string.gfind(str, pat) do
nb = nb + 1
result[nb] = part
lastPos = pos
if nb == maxNb then break end
end
-- Handle the last field
if nb ~= maxNb then
result[nb + 1] = string.sub(str, lastPos)
end
return result
end
function rbl_cb(task, to_resolve, results, err)
if results then
local _,_,o4,o3,o2,o1,in_rbl = string.find(to_resolve, '(%d+)%.(%d+)%.(%d+)%.(%d+)%.(.+)')
-- Get corresponding rule by rbl name
for _,rule in ipairs(rules) do
if rule['map'] == in_rbl then
task:insert_result(rule['symbol'], 1, rule['map'])
return
end
end
end
end
function check_multimap(task)
for _,rule in ipairs(rules) do
if rule['type'] == 'ip' then
local ip = task:get_from_ip_num()
if rule['ips']:get_key(ip) then
task:insert_result(rule['symbol'], 1)
end
elseif rule['type'] == 'header' then
local headers = task:get_message():get_header(rule['header'])
if headers then
for _,hv in ipairs(headers) do
if rule['pattern'] then
-- extract a part from header
local _,_,ext = string.find(hv, rule['pattern'])
if ext then
if rule['hash']:get_key(ext) then
task:insert_result(rule['symbol'], 1)
end
end
else
if rule['hash']:get_key(hv) then
task:insert_result(rule['symbol'], 1)
end
end
end
end
elseif rule['type'] == 'dnsbl' then
local ip = task:get_from_ip()
if ip then
local _,_,o1,o2,o3,o4 = string.find(ip, '(%d+)%.(%d+)%.(%d+)%.(%d+)')
local rbl_str = o4 .. '.' .. o3 .. '.' .. o2 .. '.' .. o1 .. '.' .. rule['map']
task:resolve_dns_a(rbl_str, 'rbl_cb')
end
end
end
end
function add_rule(params)
local newrule = {
type = 'ip',
header = nil,
pattern = nil,
map = nil,
symbol = nil
}
for _,param in ipairs(params) do
local _,_,name,value = string.find(param, '(%w+)%s*=%s*(.+)')
if not name or not value then
rspamd_logger:err('invalid rule: '..param)
return nil
end
if name == 'type' then
if value == 'ip' then
newrule['type'] = 'ip'
elseif value == 'dnsbl' then
newrule['type'] = 'dnsbl'
elseif value == 'header' then
newrule['type'] = 'header'
else
rspamd_logger:err('invalid rule type: '.. value)
return nil
end
elseif name == 'header' then
newrule['header'] = value
elseif name == 'pattern' then
newrule['pattern'] = value
elseif name == 'map' then
newrule['map'] = value
elseif name == 'symbol' then
newrule['symbol'] = value
else
rspamd_logger:err('invalid rule option: '.. name)
return nil
end
end
if not newrule['symbol'] or not newrule['map'] or not newrule['symbol'] then
rspamd_logger:err('incomplete rule')
return nil
end
if newrule['type'] == 'ip' then
newrule['ips'] = rspamd_config:add_radix_map (newrule['map'])
elseif newrule['type'] == 'header' then
newrule['hash'] = rspamd_config:add_hash_map (newrule['map'])
end
table.insert(rules, newrule)
return newrule
end
-- Registration
rspamd_config:register_module_option('multimap', 'rule', 'string')
local opts = rspamd_config:get_all_opt('multimap')
if opts then
local strrules = opts['rule']
if strrules then
if type(strrules) == 'table' then
for _,value in ipairs(strrules) do
local params = split(value, ',')
local rule = add_rule (params)
if not rule then
rspamd_logger:err('cannot add rule: "'..value..'"')
else
rspamd_config:register_virtual_symbol(rule['symbol'], 1.0)
end
end
elseif type(strrules) == 'string' then
local params = split(strrules, ',')
local rule = add_rule (params)
if not rule then
rspamd_logger:err('cannot add rule: "'..strrules..'"')
else
rspamd_config:register_virtual_symbol(rule['symbol'], 1.0)
end
end
end
end
if table.maxn(rules) > 0 then
-- add fake symbol to check all maps inside a single callback
rspamd_config:register_callback_symbol('MULTIMAP', 1.0, 'check_multimap')
end
|
