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#
# httpauth/basicauth.rb -- HTTP basic access authentication
#
# Author: IPR -- Internet Programming with Ruby -- writers
# Copyright (c) 2003 Internet Programming with Ruby writers. All rights
# reserved.
#
# $IPR: basicauth.rb,v 1.5 2003/02/20 07:15:47 gotoyuzo Exp $
require 'webrick/config'
require 'webrick/httpstatus'
require 'webrick/httpauth/authenticator'
module WEBrick
module HTTPAuth
##
# Basic Authentication for WEBrick
#
# Use this class to add basic authentication to a WEBrick servlet.
#
# Here is an example of how to set up a BasicAuth:
#
# config = { :Realm => 'BasicAuth example realm' }
#
# htpasswd = WEBrick::HTTPAuth::Htpasswd.new 'my_password_file'
# htpasswd.set_passwd config[:Realm], 'username', 'password'
# htpasswd.flush
#
# config[:UserDB] = htpasswd
#
# basic_auth = WEBrick::HTTPAuth::BasicAuth.new config
class BasicAuth
include Authenticator
AuthScheme = "Basic" # :nodoc:
##
# Used by UserDB to create a basic password entry
def self.make_passwd(realm, user, pass)
pass ||= ""
pass.crypt(Utils::random_string(2))
end
attr_reader :realm, :userdb, :logger
##
# Creates a new BasicAuth instance.
#
# See WEBrick::Config::BasicAuth for default configuration entries
#
# You must supply the following configuration entries:
#
# :Realm:: The name of the realm being protected.
# :UserDB:: A database of usernames and passwords.
# A WEBrick::HTTPAuth::Htpasswd instance should be used.
def initialize(config, default=Config::BasicAuth)
check_init(config)
@config = default.dup.update(config)
end
##
# Authenticates a +req+ and returns a 401 Unauthorized using +res+ if
# the authentication was not correct.
def authenticate(req, res)
unless basic_credentials = check_scheme(req)
challenge(req, res)
end
userid, password = basic_credentials.unpack("m*")[0].split(":", 2)
password ||= ""
if userid.empty?
error("user id was not given.")
challenge(req, res)
end
unless encpass = @userdb.get_passwd(@realm, userid, @reload_db)
error("%s: the user is not allowed.", userid)
challenge(req, res)
end
if password.crypt(encpass) != encpass
error("%s: password unmatch.", userid)
challenge(req, res)
end
info("%s: authentication succeeded.", userid)
req.user = userid
end
##
# Returns a challenge response which asks for for authentication
# information
def challenge(req, res)
res[@response_field] = "#{@auth_scheme} realm=\"#{@realm}\""
raise @auth_exception
end
end
##
# Basic authentication for proxy servers. See BasicAuth for details.
class ProxyBasicAuth < BasicAuth
include ProxyAuthenticator
end
end
end