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📄 md5.rb(3.1 KB)
📄 nonce.rb(1.21 KB)
📄 params.rb(1.07 KB)
📄 request.rb(969 B)

Editing: md5.rb

# frozen_string_literal: true

require_relative '../abstract/handler'
require_relative 'request'
require_relative 'params'
require_relative 'nonce'
require 'digest/md5'

module Rack
  module Auth
    module Digest
      # Rack::Auth::Digest::MD5 implements the MD5 algorithm version of
      # HTTP Digest Authentication, as per RFC 2617.
      #
      # Initialize with the [Rack] application that you want protecting,
      # and a block that looks up a plaintext password for a given username.
      #
      # +opaque+ needs to be set to a constant base64/hexadecimal string.
      #
      class MD5 < AbstractHandler

attr_accessor :opaque

attr_writer :passwords_hashed

def initialize(app, realm = nil, opaque = nil, &authenticator)
          @passwords_hashed = nil
          if opaque.nil? and realm.respond_to? :values_at
            realm, opaque, @passwords_hashed = realm.values_at :realm, :opaque, :passwords_hashed
          end
          super(app, realm, &authenticator)
          @opaque = opaque
        end

def passwords_hashed?
          !!@passwords_hashed
        end

def call(env)
          auth = Request.new(env)

unless auth.provided?
            return unauthorized
          end

if !auth.digest? || !auth.correct_uri? || !valid_qop?(auth)
            return bad_request
          end

if valid?(auth)
            if auth.nonce.stale?
              return unauthorized(challenge(stale: true))
            else
              env['REMOTE_USER'] = auth.username

return @app.call(env)
            end
          end

unauthorized
        end

private

QOP = 'auth'

def params(hash = {})
          Params.new do |params|
            params['realm'] = realm
            params['nonce'] = Nonce.new.to_s
            params['opaque'] = H(opaque)
            params['qop'] = QOP

hash.each { |k, v| params[k] = v }
          end
        end

def challenge(hash = {})
          "Digest #{params(hash)}"
        end

def valid?(auth)
          valid_opaque?(auth) && valid_nonce?(auth) && valid_digest?(auth)
        end

def valid_qop?(auth)
          QOP == auth.qop
        end

def valid_opaque?(auth)
          H(opaque) == auth.opaque
        end

def valid_nonce?(auth)
          auth.nonce.valid?
        end

def valid_digest?(auth)
          pw = @authenticator.call(auth.username)
          pw && Rack::Utils.secure_compare(digest(auth, pw), auth.response)
        end

def md5(data)
          ::Digest::MD5.hexdigest(data)
        end

alias :H :md5

def KD(secret, data)
          H "#{secret}:#{data}"
        end

def A1(auth, password)
          "#{auth.username}:#{auth.realm}:#{password}"
        end

def A2(auth)
          "#{auth.method}:#{auth.uri}"
        end

def digest(auth, password)
          password_hash = passwords_hashed? ? password : H(A1(auth, password))

KD password_hash, "#{auth.nonce}:#{auth.nc}:#{auth.cnonce}:#{QOP}:#{H A2(auth)}"
        end

end
    end
  end
end

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