discourse/lib/common_passwords/common_passwords.rb

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# CommonPasswords will check a given password against a list of the most commonly used passwords.
# The list comes from https://xato.net/passwords/more-top-worst-passwords/#.UrR1AHmpxs4
# The list is stored in Redis at a key that is shared by all sites in a multisite config.
#
# If the password file is changed, you need to add a migration that deletes the list from redis
# so it gets re-populated:
#
# $redis.without_namespace.del CommonPasswords::LIST_KEY
class CommonPasswords
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PASSWORD_FILE = File.join(Rails.root, 'lib', 'common_passwords', 'long-common-passwords.txt')
LIST_KEY = 'discourse-common-passwords'
@mutex = Mutex.new
def self.common_password?(password)
return false unless password.present?
password_list.include?(password)
end
private
class RedisPasswordList
def include?(password)
CommonPasswords.redis.sismember CommonPasswords::LIST_KEY, password
end
end
def self.password_list
@mutex.synchronize do
load_passwords unless redis.scard(LIST_KEY) > 0
end
RedisPasswordList.new
end
def self.redis
$redis.without_namespace
end
def self.load_passwords
passwords = File.readlines(PASSWORD_FILE)
passwords.map!(&:chomp).each do |pwd|
# slower, but a tad more compatible
redis.sadd LIST_KEY, pwd
end
rescue Errno::ENOENT
# tolerate this so we don't block signups
Rails.logger.error "Common passwords file #{PASSWORD_FILE} is not found! Common password checking is skipped."
end
end