AlkantarClanX12
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# frozen_string_literal: true
require_relative 'abstract/handler'
require_relative 'abstract/request'
require 'digest/md5'
require 'base64'
module Rack
warn "Rack::Auth::Digest is deprecated and will be removed in Rack 3.1", uplevel: 1
module Auth
module Digest
# Rack::Auth::Digest::Nonce is the default nonce generator for the
# Rack::Auth::Digest::MD5 authentication handler.
#
# +private_key+ needs to set to a constant string.
#
# +time_limit+ can be optionally set to an integer (number of seconds),
# to limit the validity of the generated nonces.
class Nonce
class << self
attr_accessor :private_key, :time_limit
end
def self.parse(string)
new(*Base64.decode64(string).split(' ', 2))
end
def initialize(timestamp = Time.now, given_digest = nil)
@timestamp, @given_digest = timestamp.to_i, given_digest
end
def to_s
Base64.encode64("#{@timestamp} #{digest}").strip
end
def digest
::Digest::MD5.hexdigest("#{@timestamp}:#{self.class.private_key}")
end
def valid?
digest == @given_digest
end
def stale?
!self.class.time_limit.nil? && (Time.now.to_i - @timestamp) > self.class.time_limit
end
def fresh?
!stale?
end
end
class Params < Hash
def self.parse(str)
Params[*split_header_value(str).map do |param|
k, v = param.split('=', 2)
[k, dequote(v)]
end.flatten]
end
def self.dequote(str) # From WEBrick::HTTPUtils
ret = (/\A"(.*)"\Z/ =~ str) ? $1 : str.dup
ret.gsub!(/\\(.)/, "\\1")
ret
end
def self.split_header_value(str)
str.scan(/\w+\=(?:"[^\"]+"|[^,]+)/n)
end
def initialize
super()
yield self if block_given?
end
def [](k)
super k.to_s
end
def []=(k, v)
super k.to_s, v.to_s
end
UNQUOTED = ['nc', 'stale']
def to_s
map do |k, v|
"#{k}=#{(UNQUOTED.include?(k) ? v.to_s : quote(v))}"
end.join(', ')
end
def quote(str) # From WEBrick::HTTPUtils
'"' + str.gsub(/[\\\"]/o, "\\\1") + '"'
end
end
class Request < Auth::AbstractRequest
def method
@env[RACK_METHODOVERRIDE_ORIGINAL_METHOD] || @env[REQUEST_METHOD]
end
def digest?
"digest" == scheme
end
def correct_uri?
request.fullpath == uri
end
def nonce
@nonce ||= Nonce.parse(params['nonce'])
end
def params
@params ||= Params.parse(parts.last)
end
def respond_to?(sym, *)
super or params.has_key? sym.to_s
end
def method_missing(sym, *args)
return super unless params.has_key?(key = sym.to_s)
return params[key] if args.size == 0
raise ArgumentError, "wrong number of arguments (#{args.size} for 0)"
end
end
# 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