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APEL/SSMOverview

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Revision as of 14:11, 15 February 2012 by Wrogers (talk | contribs)
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These notes are incomplete and will be updated. Please send suggestions and queries to apel-admins@mailtalk.ac.uk.

The Secure Stomp Messenger (SSM) is a python package designed to send arbitrary files using ActiveMQ and the STOMP protocol. It is designed to have a simple interface:

Very simplified version

  1. The sending and receiving SSMs are configured to communicate using a specified topic.
  2. A file is written to the sending SSM's 'outgoing' directory (by some other process)
  3. The file disappears from outgoing directory.
  4. The file appears in receiving SSM's 'incoming' directory along with a second file containing the sending SSM's certificate DN.

Less simplified version

  • The sending SSM:
    • requests the receiving SSM's certificate
    • takes files from a directory on its filesystem
    • encrypts (using requested certificate) and signs (using own key) the files
    • sends the encrypted files to a specified ActiveMQ topic.
  • The receiving SSM:
    • receives the message from the topic
    • decrypts the message (using own key)
    • retrieves the sender's certificate (from signature)
    • stores the message and the sender's certificate DN (in separate files) in a directory on its filesystem.

Once the sending and receiving SSMs are configured and running correctly (this is not yet a trivial process), the details of this process are not important. If you are sending a message, put a file in the correct outgoing directory and it will disappear. It will promptly appear in the incoming directory of the receiving SSM.