将现有密码哈希转换为设计

Question

我正在尝试将现有的 Admin 模型转换为 Devise。我们已经有了密码哈希，但显然它与设计不兼容。我想做的是接受登录表单并根据加密密码检查提供的密码。如果不正确，使用旧的哈希检查密码，如果匹配，清空旧的password_hash字段并将Devise的密码设置为提供的密码并保存模型。

前进的最佳方式是什么？我怀疑我需要覆盖某些东西，也许是在自定义控制器中，但我不完全确定如何继续。

Answer 1

你可以让Devise用新的crypt方案来做加密密码的“辛苦工作”，如https://gist.github.com/1704632所示：

class User < ActiveRecord::Base
  alias :devise_valid_password? :valid_password?

  def valid_password?(password)
    begin
      super(password)
    rescue BCrypt::Errors::InvalidHash
      return false unless Digest::SHA1.hexdigest(password) == encrypted_password
      logger.info "User #{email} is using the old password hashing method, updating attribute."
      self.password = password
      true
    end
  end
end

Answer 2

在 Devise 中使用 bcrypt 加密器，这就是我最终对遗留数据所做的事情：

在models/user.rb中

# Because we have some old legacy users in the database, we need to override Devises method for checking if a password is valid.
# We first ask Devise if the password is valid, and if it throws an InvalidHash exception, we know that we're dealing with a
# legacy user, so we check the password against the SHA1 algorithm that was used to hash the password in the old database.
alias :devise_valid_password? :valid_password?
def valid_password?(password)
  begin
    devise_valid_password?(password)
  rescue BCrypt::Errors::InvalidHash
    Digest::SHA1.hexdigest(password) == encrypted_password
  end
end

如您所见，devise 在遇到无效哈希时会引发 InvalidHash 异常，这在对旧用户进行身份验证时会这样做。 我使用它来回退到用于创建原始遗留哈希的哈希算法。

虽然它不会更改密码，但如果需要，可以简单地将其添加到方法中。

Answer 3

首先您需要将 password_salt 和 encrypted_pa​​ssword 复制到您的新对象模型中

使用它是因为我必须将我的数据库用户导出到另一个应用程序和旧的， 应用程序正在使用设计 1.0.x 和新应用程序使用 2.1.x

Class User < ActiveRecord::Base
 alias :devise_valid_password? :valid_password?
    def valid_password?(password)
      begin
        devise_valid_password?(password)
      rescue BCrypt::Errors::InvalidHash
        salt = password_salt
        digest = nil
        10.times { digest = ::Digest::SHA1.hexdigest('--' << [salt, digest, password, nil].flatten.join('--') << '--') }
        digest
        return false unless digest == encrypted_password
        logger.info "User #{email} is using the old password hashing method, updating attribute."
        self.password = password
        self.password_salt = nil # With this you will knew what object already using the new authentication by devise
        self.save
        true
      end
    end
end

Answer 4

如果您从 SHA512 迁移，该解决方案比 moeffju's SHA1 solution 涉及更多：

def valid_password?(password)
  if has_legacy_password?
    return false unless valid_legacy_password?(password)
    convert_legacy_password!(password)
    true
  else
    super(password)
  end
end

protected

def has_legacy_password?
  password_salt.present?
end

def convert_legacy_password!(password)
  self.password = password
  self.password_salt = nil
  self.save
end

def valid_legacy_password?(password)
  stretches = 10
  salt = password_salt
  pepper = nil
  digest = pepper

  stretches.times do
    tokens = [salt, digest, password, pepper]
    digest = Digest::SHA512.hexdigest('--' << tokens.flatten.join('--') << '--')
  end

  Devise.secure_compare(encrypted_password, digest)
end

请务必将 stretches 和 pepper 替换为您用于加密密码的值。

Answer 5

按照 Thomas Dippel 的说明，我已经做了一个更新密码的要点： https://gist.github.com/1578362

    # Because we have some old legacy users in the database, we need to override Devises method for checking if a password is valid.
# We first ask Devise if the password is valid, and if it throws an InvalidHash exception, we know that we're dealing with a
# legacy user, so we check the password against the SHA1 algorithm that was used to hash the password in the old database.
#SOURCES OF SOLUTION:
# http://stackoverflow.com/questions/6113375/converting-existing-password-hash-to-devise
# https://github.com/binarylogic/authlogic/blob/master/lib/authlogic/crypto_providers/sha512.rb
# https://github.com/plataformatec/devise/blob/master/lib/devise/encryptors/authlogic_sha512.rb

alias :devise_valid_password? :valid_password?
def valid_password?(password)
  debugger
  begin
    devise_valid_password?(password)
  rescue BCrypt::Errors::InvalidHash
    stretches = 20
    digest = [password, self.password_salt].flatten.join('')
    stretches.times {digest = Digest::SHA512.hexdigest(digest)}
    if digest == self.encrypted_password
      #Here update old Authlogic SHA512 Password with new Devise ByCrypt password
      # SOURCE: https://github.com/plataformatec/devise/blob/master/lib/devise/models/database_authenticatable.rb
      # Digests the password using bcrypt.
      # Default strategy for Devise is BCrypt
      # def password_digest(password)
      # ::BCrypt::Password.create("#{password}#{self.class.pepper}", :cost => self.class.stretches).to_s
      # end
      self.encrypted_password = self.password_digest(password)
      self.save
      return true
    else
      # If not BCryt password and not old Authlogic SHA512 password Dosn't my user
      return false
    end
  end
end