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86 lines
3.0 KiB
86 lines
3.0 KiB
#-- encoding: UTF-8
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#-- copyright
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# OpenProject is a project management system.
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# Copyright (C) 2012-2015 the OpenProject Foundation (OPF)
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License version 3.
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#
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# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
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# Copyright (C) 2006-2013 Jean-Philippe Lang
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# Copyright (C) 2010-2013 the ChiliProject Team
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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# See doc/COPYRIGHT.rdoc for more details.
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#++
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class UserPassword < ActiveRecord::Base
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belongs_to :user, inverse_of: :passwords
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# passwords must never be modified, so doing this on create should be enough
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before_create :salt_and_hash_password!
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attr_accessor :plain_password
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# Checks whether the stored password is the same as a given plaintext password
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def same_as_plain_password?(plain_password)
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UserPassword.secure_equals?(UserPassword.hash_with_salt(plain_password,
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salt),
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hashed_password)
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end
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def expired?
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days_valid = Setting.password_days_valid.to_i.days
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return false if days_valid == 0
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created_at < (Time.now - days_valid)
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end
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# Returns a 128bits random salt as a hex string (32 chars long)
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def self.generate_salt
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SecureRandom.hex(16)
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end
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# Return password digest
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def self.hash_password(plain_password)
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Digest::SHA1.hexdigest(plain_password)
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end
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# Hash a plaintext password with a given salt
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# The hashed password has following form: SHA1(salt + SHA1(password))
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def self.hash_with_salt(plain_password, salt)
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# We should really use a standard key-derivation function like bcrypt here
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hash_password("#{salt}#{hash_password plain_password}")
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end
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# constant-time comparison algorithm to prevent timing attacks
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def self.secure_equals?(a, b)
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return false if a.blank? || b.blank? || a.bytesize != b.bytesize
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l = a.unpack "C#{a.bytesize}"
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res = 0
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b.each_byte do |byte| res |= byte ^ l.shift end
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res == 0
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end
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private
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def salt_and_hash_password!
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return if plain_password.nil?
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self.salt = UserPassword.generate_salt
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self.hashed_password = UserPassword.hash_with_salt(plain_password,
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salt)
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end
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end
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