Class: Jabber::SASL::DigestMD5

Inherits:
Base
  • Object
show all
Defined in:
lib/xmpp4r/sasl.rb

Overview

SASL DIGEST-MD5 authentication helper (RFC2831)

Instance Method Summary collapse

Constructor Details

#initialize(stream) ⇒ DigestMD5

Sends the wished auth mechanism and wait for a challenge

(proceed with DigestMD5#auth)



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# File 'lib/xmpp4r/sasl.rb', line 74

def initialize(stream)
  super

  challenge = {}
  error = nil
  @stream.send(generate_auth('DIGEST-MD5')) { |reply|
    if reply.name == 'challenge' and reply.namespace == NS_SASL
      challenge_text = Base64::decode64(reply.text)
      challenge_text.split(/,/).each { |s|
        key, value = s.split(/=/, 2)
        value.sub!(/^"/, '')
        value.sub!(/"$/, '')
        challenge[key] = value
      }
    else
      error = reply.first_element(nil).name
    end
    true
  }
  raise error if error

  @nonce = challenge['nonce']
  @realm = challenge['realm']
end

Instance Method Details

#auth(password) ⇒ Object

  • Send a response

  • Wait for the server’s challenge (which aren’t checked)

  • Send a blind response to the server’s challenge



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# File 'lib/xmpp4r/sasl.rb', line 103

def auth(password)
  response = {}
  response['nonce'] = @nonce
  response['charset'] = 'utf-8'
  response['username'] = @stream.jid.node
  response['realm'] = @realm || @stream.jid.domain
  response['cnonce'] = generate_nonce
  response['nc'] = '00000001'
  response['qop'] = 'auth'
  response['digest-uri'] = "xmpp/#{@stream.jid.domain}"
  response['response'] = response_value(@stream.jid.node, @stream.jid.domain, response['digest-uri'], password, @nonce, response['cnonce'], response['qop'])
  response.each { |key,value|
    unless %w(nc qop response charset).include? key
      response[key] = "\"#{value}\""
    end
  }

  r = REXML::Element.new('response')
  r.add_namespace NS_SASL
  r.text = Base64::encode64(response.collect { |k,v| "#{k}=#{v}" }.join(',')).gsub(/\s/, '')
  error = nil
  @stream.send(r) { |reply|
    if reply.name != 'challenge'
      error = reply.first_element(nil).name
    end
    true
  }
  
  raise error if error

  # TODO: check the challenge from the server

  r.text = nil
  @stream.send(r) { |reply|
    if reply.name != 'success'
      error = reply.first_element(nil).name
    end
    true
  }
  
  raise error if error
end