mirror of https://github.com/rspamd/rspamd.git
Rapid spam filtering system
https://rspamd.com/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
86 lines
2.3 KiB
86 lines
2.3 KiB
--[[
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Copyright (c) 2019, Vsevolod Stakhov <vsevolod@highsecure.ru>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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]]--
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-- Bitcoin filter rules
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local fun = require "fun"
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local off = 0
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local base58_dec = fun.tomap(fun.map(
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function(c)
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off = off + 1
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return c,(off - 1)
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end,
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"123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"))
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rspamd_config:register_symbol{
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name = 'BITCOIN_ADDR',
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callback = function(task)
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local rspamd_re = require "rspamd_regexp"
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local hash = require "rspamd_cryptobox_hash"
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local wallet_re = rspamd_re.create_cached('^[13][1-9A-Za-z]{25,34}$')
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local words_matched = {}
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local valid_wallets = {}
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for _,part in ipairs(task:get_text_parts() or {}) do
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local pw = part:filter_words(wallet_re, 'raw', 3)
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if pw and #pw > 0 then
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for _,w in ipairs(pw) do
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words_matched[#words_matched + 1] = w
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end
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end
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end
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for _,word in ipairs(words_matched) do
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local bytes = {}
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for i=1,25 do bytes[i] = 0 end
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-- Base58 decode loop
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fun.each(function(ch)
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local acc = base58_dec[ch] or 0
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for i=25,1,-1 do
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acc = acc + (58 * bytes[i]);
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bytes[i] = acc % 256
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acc = math.floor(acc / 256);
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end
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end, word)
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-- Now create a validation tag
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local sha256 = hash.create_specific('sha256')
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for i=1,21 do
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sha256:update(string.char(bytes[i]))
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end
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sha256 = hash.create_specific('sha256', sha256:bin()):bin()
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-- Compare tags
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local valid = true
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for i=1,4 do
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if string.sub(sha256, i, i) ~= string.char(bytes[21 + i]) then
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valid = false
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end
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end
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if valid then
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valid_wallets[#valid_wallets + 1] = word
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end
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end
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if #valid_wallets > 0 then
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return true,1.0,valid_wallets
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end
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end,
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score = 0.0,
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group = 'scams'
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}
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