将现有密码哈希转换为 Devise

Question

我正在尝试将现有的管理模型转换为设计。我们已经有了密码哈希，但它显然与 Devise 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，请使用旧的哈希值检查密码，如果匹配，则清空旧的 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？我怀疑我需要重写某些东西，也许是在自定义控制器中，但我不完全确定如何继续。

Answer 1

您可以让 Devise 完成使用新的加密方案加密密码的“艰苦工作”，如 https:// gist.github.com/1704632：

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

# 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抛出 InvalidHash 异常，这会导致在对旧用户进行身份验证时就可以了。
我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复制到新的对象模型

使用这个，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 devise 1.0.x，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

如果您要从 SHA512 迁移，该解决方案比 moeffju 的 SHA1 解决方案复杂一些：

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

请务必替换 stretches 和 pepper 使用您用于加密密码的值。

Answer 5

按照 Thomas Dippel 的说明，我制定了更新密码的要点：
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