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#
# httpauth/digestauth.rb -- HTTP digest access authentication
#
# Author: IPR -- Internet Programming with Ruby -- writers
# Copyright (c) 2003 Internet Programming with Ruby writers.
# Copyright (c) 2003 H.M.
#
# The original implementation is provided by H.M.
# URL: http://rwiki.jin.gr.jp/cgi-bin/rw-cgi.rb?cmd=view;name=
# %C7%A7%BE%DA%B5%A1%C7%BD%A4%F2%B2%FE%C2%A4%A4%B7%A4%C6%A4%DF%A4%EB
#
# $IPR: digestauth.rb,v 1.5 2003/02/20 07:15:47 gotoyuzo Exp $
require 'webrick/config'
require 'webrick/httpstatus'
require 'webrick/httpauth/authenticator'
require 'digest/md5'
require 'digest/sha1'
module WEBrick
module HTTPAuth
##
# RFC 2617 Digest Access Authentication for WEBrick
#
# Use this class to add digest authentication to a WEBrick servlet.
#
# Here is an example of how to set up DigestAuth:
#
# config = { :Realm => 'DigestAuth example realm' }
#
# htdigest = WEBrick::HTTPAuth::Htdigest.new 'my_password_file'
# htdigest.set_passwd config[:Realm], 'username', 'password'
# htdigest.flush
#
# config[:UserDB] = htdigest
#
# digest_auth = WEBrick::HTTPAuth::DigestAuth.new config
#
# When using this as with a servlet be sure not to create a new DigestAuth
# object in the servlet's #initialize. By default WEBrick creates a new
# servlet instance for every request and the DigestAuth object must be
# used across requests.
class DigestAuth
include Authenticator
AuthScheme = "Digest" # :nodoc:
##
# Struct containing the opaque portion of the digest authentication
OpaqueInfo = Struct.new(:time, :nonce, :nc) # :nodoc:
##
# Digest authentication algorithm
attr_reader :algorithm
##
# Quality of protection. RFC 2617 defines "auth" and "auth-int"
attr_reader :qop
##
# Used by UserDB to create a digest password entry
def self.make_passwd(realm, user, pass)
pass ||= ""
Digest::MD5::hexdigest([user, realm, pass].join(":"))
end
##
# Creates a new DigestAuth instance. Be sure to use the same DigestAuth
# instance for multiple requests as it saves state between requests in
# order to perform authentication.
#
# See WEBrick::Config::DigestAuth 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::Htdigest instance should be used.
def initialize(config, default=Config::DigestAuth)
check_init(config)
@config = default.dup.update(config)
@algorithm = @config[:Algorithm]
@domain = @config[:Domain]
@qop = @config[:Qop]
@use_opaque = @config[:UseOpaque]
@use_next_nonce = @config[:UseNextNonce]
@check_nc = @config[:CheckNc]
@use_auth_info_header = @config[:UseAuthenticationInfoHeader]
@nonce_expire_period = @config[:NonceExpirePeriod]
@nonce_expire_delta = @config[:NonceExpireDelta]
@internet_explorer_hack = @config[:InternetExplorerHack]
case @algorithm
when 'MD5','MD5-sess'
@h = Digest::MD5
when 'SHA1','SHA1-sess' # it is a bonus feature :-)
@h = Digest::SHA1
else
msg = format('Algorithm "%s" is not supported.', @algorithm)
raise ArgumentError.new(msg)
end
@instance_key = hexdigest(self.__id__, Time.now.to_i, Process.pid)
@opaques = {}
@last_nonce_expire = Time.now
@mutex = Mutex.new
end
##
# Authenticates a +req+ and returns a 401 Unauthorized using +res+ if
# the authentication was not correct.
def authenticate(req, res)
unless result = @mutex.synchronize{ _authenticate(req, res) }
challenge(req, res)
end
if result == :nonce_is_stale
challenge(req, res, true)
end
return true
end
##
# Returns a challenge response which asks for for authentication
# information
def challenge(req, res, stale=false)
nonce = generate_next_nonce(req)
if @use_opaque
opaque = generate_opaque(req)
@opaques[opaque].nonce = nonce
end
param = Hash.new
param["realm"] = HTTPUtils::quote(@realm)
param["domain"] = HTTPUtils::quote(@domain.to_a.join(" ")) if @domain
param["nonce"] = HTTPUtils::quote(nonce)
param["opaque"] = HTTPUtils::quote(opaque) if opaque
param["stale"] = stale.to_s
param["algorithm"] = @algorithm
param["qop"] = HTTPUtils::quote(@qop.to_a.join(",")) if @qop
res[@response_field] =
"#{@auth_scheme} " + param.map{|k,v| "#{k}=#{v}" }.join(", ")
info("%s: %s", @response_field, res[@response_field]) if $DEBUG
raise @auth_exception
end
private
# :stopdoc:
MustParams = ['username','realm','nonce','uri','response']
MustParamsAuth = ['cnonce','nc']
def _authenticate(req, res)
unless digest_credentials = check_scheme(req)
return false
end
auth_req = split_param_value(digest_credentials)
if auth_req['qop'] == "auth" || auth_req['qop'] == "auth-int"
req_params = MustParams + MustParamsAuth
else
req_params = MustParams
end
req_params.each{|key|
unless auth_req.has_key?(key)
error('%s: parameter missing. "%s"', auth_req['username'], key)
raise HTTPStatus::BadRequest
end
}
if !check_uri(req, auth_req)
raise HTTPStatus::BadRequest
end
if auth_req['realm'] != @realm
error('%s: realm unmatch. "%s" for "%s"',
auth_req['username'], auth_req['realm'], @realm)
return false
end
auth_req['algorithm'] ||= 'MD5'
if auth_req['algorithm'].upcase != @algorithm.upcase
error('%s: algorithm unmatch. "%s" for "%s"',
auth_req['username'], auth_req['algorithm'], @algorithm)
return false
end
if (@qop.nil? && auth_req.has_key?('qop')) ||
(@qop && (! @qop.member?(auth_req['qop'])))
error('%s: the qop is not allowed. "%s"',
auth_req['username'], auth_req['qop'])
return false
end
password = @userdb.get_passwd(@realm, auth_req['username'], @reload_db)
unless password
error('%s: the user is not allowed.', auth_req['username'])
return false
end
nonce_is_invalid = false
if @use_opaque
info("@opaque = %s", @opaque.inspect) if $DEBUG
if !(opaque = auth_req['opaque'])
error('%s: opaque is not given.', auth_req['username'])
nonce_is_invalid = true
elsif !(opaque_struct = @opaques[opaque])
error('%s: invalid opaque is given.', auth_req['username'])
nonce_is_invalid = true
elsif !check_opaque(opaque_struct, req, auth_req)
@opaques.delete(auth_req['opaque'])
nonce_is_invalid = true
end
elsif !check_nonce(req, auth_req)
nonce_is_invalid = true
end
if /-sess$/i =~ auth_req['algorithm']
ha1 = hexdigest(password, auth_req['nonce'], auth_req['cnonce'])
else
ha1 = password
end
if auth_req['qop'] == "auth" || auth_req['qop'] == nil
ha2 = hexdigest(req.request_method, auth_req['uri'])
ha2_res = hexdigest("", auth_req['uri'])
elsif auth_req['qop'] == "auth-int"
body_digest = @h.new
req.body { |chunk| body_digest.update(chunk) }
body_digest = body_digest.hexdigest
ha2 = hexdigest(req.request_method, auth_req['uri'], body_digest)
ha2_res = hexdigest("", auth_req['uri'], body_digest)
end
if auth_req['qop'] == "auth" || auth_req['qop'] == "auth-int"
param2 = ['nonce', 'nc', 'cnonce', 'qop'].map{|key|
auth_req[key]
}.join(':')
digest = hexdigest(ha1, param2, ha2)
digest_res = hexdigest(ha1, param2, ha2_res)
else
digest = hexdigest(ha1, auth_req['nonce'], ha2)
digest_res = hexdigest(ha1, auth_req['nonce'], ha2_res)
end
if digest != auth_req['response']
error("%s: digest unmatch.", auth_req['username'])
return false
elsif nonce_is_invalid
error('%s: digest is valid, but nonce is not valid.',
auth_req['username'])
return :nonce_is_stale
elsif @use_auth_info_header
auth_info = {
'nextnonce' => generate_next_nonce(req),
'rspauth' => digest_res
}
if @use_opaque
opaque_struct.time = req.request_time
opaque_struct.nonce = auth_info['nextnonce']
opaque_struct.nc = "%08x" % (auth_req['nc'].hex + 1)
end
if auth_req['qop'] == "auth" || auth_req['qop'] == "auth-int"
['qop','cnonce','nc'].each{|key|
auth_info[key] = auth_req[key]
}
end
res[@resp_info_field] = auth_info.keys.map{|key|
if key == 'nc'
key + '=' + auth_info[key]
else
key + "=" + HTTPUtils::quote(auth_info[key])
end
}.join(', ')
end
info('%s: authentication succeeded.', auth_req['username'])
req.user = auth_req['username']
return true
end
def split_param_value(string)
ret = {}
while string.bytesize != 0
case string
when /^\s*([\w\-\.\*\%\!]+)=\s*\"((\\.|[^\"])*)\"\s*,?/
key = $1
matched = $2
string = $'
ret[key] = matched.gsub(/\\(.)/, "\\1")
when /^\s*([\w\-\.\*\%\!]+)=\s*([^,\"]*),?/
key = $1
matched = $2
string = $'
ret[key] = matched.clone
when /^s*^,/
string = $'
else
break
end
end
ret
end
def generate_next_nonce(req)
now = "%012d" % req.request_time.to_i
pk = hexdigest(now, @instance_key)[0,32]
nonce = [now + ":" + pk].pack("m*").chop # it has 60 length of chars.
nonce
end
def check_nonce(req, auth_req)
username = auth_req['username']
nonce = auth_req['nonce']
pub_time, pk = nonce.unpack("m*")[0].split(":", 2)
if (!pub_time || !pk)
error("%s: empty nonce is given", username)
return false
elsif (hexdigest(pub_time, @instance_key)[0,32] != pk)
error("%s: invalid private-key: %s for %s",
username, hexdigest(pub_time, @instance_key)[0,32], pk)
return false
end
diff_time = req.request_time.to_i - pub_time.to_i
if (diff_time < 0)
error("%s: difference of time-stamp is negative.", username)
return false
elsif diff_time > @nonce_expire_period
error("%s: nonce is expired.", username)
return false
end
return true
end
def generate_opaque(req)
@mutex.synchronize{
now = req.request_time
if now - @last_nonce_expire > @nonce_expire_delta
@opaques.delete_if{|key,val|
(now - val.time) > @nonce_expire_period
}
@last_nonce_expire = now
end
begin
opaque = Utils::random_string(16)
end while @opaques[opaque]
@opaques[opaque] = OpaqueInfo.new(now, nil, '00000001')
opaque
}
end
def check_opaque(opaque_struct, req, auth_req)
if (@use_next_nonce && auth_req['nonce'] != opaque_struct.nonce)
error('%s: nonce unmatched. "%s" for "%s"',
auth_req['username'], auth_req['nonce'], opaque_struct.nonce)
return false
elsif !check_nonce(req, auth_req)
return false
end
if (@check_nc && auth_req['nc'] != opaque_struct.nc)
error('%s: nc unmatched."%s" for "%s"',
auth_req['username'], auth_req['nc'], opaque_struct.nc)
return false
end
true
end
def check_uri(req, auth_req)
uri = auth_req['uri']
if uri != req.request_uri.to_s && uri != req.unparsed_uri &&
(@internet_explorer_hack && uri != req.path)
error('%s: uri unmatch. "%s" for "%s"', auth_req['username'],
auth_req['uri'], req.request_uri.to_s)
return false
end
true
end
def hexdigest(*args)
@h.hexdigest(args.join(":"))
end
# :startdoc:
end
##
# Digest authentication for proxy servers. See DigestAuth for details.
class ProxyDigestAuth < DigestAuth
include ProxyAuthenticator
private
def check_uri(req, auth_req) # :nodoc:
return true
end
end
end
end
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