Created
October 28, 2016 02:10
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Decrypt jenkins password / token
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#!/usr/bin/env ruby | |
# refer to | |
# https://github.com/jenkinsci/jenkins/blob/master/core/src/main/java/hudson/util/Secret.java | |
# https://github.com/jenkinsci/jenkins/blob/master/core/src/main/java/jenkins/security/ApiTokenProperty.java | |
require 'base64' | |
require 'digest' | |
require 'openssl' | |
MAGIC = '::::MAGIC::::' | |
ALGORITHM = 'AES-128-ECB' | |
def try_decrypt(master_key, hudson_secret_key) | |
hashed_master_key = Digest::SHA256.digest(master_key)[0..15] | |
intermediate = OpenSSL::Cipher.new(ALGORITHM) | |
intermediate.decrypt | |
intermediate.key = hashed_master_key | |
salted_final = intermediate.update(hudson_secret_key) + intermediate.final | |
raise 'no magic key in a' unless salted_final.include?(MAGIC) | |
salted_final[0..15] | |
end | |
def main(filename, input) | |
abort "usage: #{filename} <master.key> <hudson.util.Secret> encryptedText" unless input.length == 3 | |
master_key = File.read(input[0]) | |
hudson_secret_key = File.read(input[1]) | |
encrypted_text = Base64.decode64(input[2]) | |
key = try_decrypt(master_key, hudson_secret_key) | |
cipher = OpenSSL::Cipher.new(ALGORITHM) | |
cipher.decrypt | |
cipher.key = key | |
text = cipher.update(encrypted_text) + cipher.final | |
text = text[0..(text.length-MAGIC.size-1)] | |
# if api token (md5 hash) | |
# text = Digest::MD5.new.update(text).hexdigest | |
puts text | |
end | |
if __FILE__ == $0 | |
main(__FILE__, ARGV) | |
end |
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