50 lines
1.5 KiB
Ruby
50 lines
1.5 KiB
Ruby
# frozen_string_literal: true
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# CommonPasswords will check a given password against a list of the most commonly used passwords.
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# The list comes from https://github.com/danielmiessler/SecLists/tree/master/Passwords
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# specifically the list of 10 million passwords, top 100k, filtered by length
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#
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# The list is stored in Redis at a key that is shared by all sites in a multisite config.
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#
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# If the password file is changed, you need to add a migration that deletes the list from redis
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# so it gets re-populated:
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#
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# Discourse.redis.without_namespace.del CommonPasswords::LIST_KEY
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class CommonPasswords
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PASSWORD_FILE = File.join(Rails.root, "lib", "common_passwords", "10-char-common-passwords.txt")
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LIST_KEY = "discourse-common-passwords"
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@mutex = Mutex.new
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def self.common_password?(password)
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return false unless password.present?
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password_list.include?(password)
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end
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private
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class RedisPasswordList
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def include?(password)
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CommonPasswords.redis.sismember CommonPasswords::LIST_KEY, password
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end
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end
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def self.password_list
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@mutex.synchronize { load_passwords unless redis.scard(LIST_KEY) > 0 }
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RedisPasswordList.new
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end
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def self.redis
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Discourse.redis.without_namespace
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end
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def self.load_passwords
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passwords = File.readlines(PASSWORD_FILE)
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redis.sadd LIST_KEY, passwords.map!(&:chomp)
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rescue Errno::ENOENT
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# tolerate this so we don't block signups
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Rails.logger.error "Common passwords file #{PASSWORD_FILE} is not found! Common password checking is skipped."
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end
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end
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