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Week 6 Distributed (Grid Middleware (SOAP – Simple Object Access Protocol,…

- - - - Enables dynamic discovery of services
    - - Supported
        
        GRAM
        
        GridFTP
        
        MDS
  - - - 1 service : several resources
      - many services : many resources
    - - Dynamic
        Created & destroyed on demand
      - Stateful
        State is defined
      - Actors of grid can
        
        Discover
        
        Inspect
        
        Modify
      - Accessed by web services
      - Addressing
        
        No address only resource ID which is provided to the web service
  - - - Envelope
        
        SOAP Header
        
        Identifying info
        
        SOAP Body
        
        Content
    - - Requirements
        
        Address of SOAP node
        
        Procedure/method name
        
        Arguments & output params & return value
        
        Separate args for identifying the web resource which is the target for RPC and the args that have data or control info for processing
        
        A message exchange pattern
        
        Optional: Data which may be carried as part of SOAP header blocks
  - - - Architecture
      - Data security
      - Scheduling & Resource management
      - Information system & performance
      - Applications & Programming models environments
      - Peer to peer
- - - - Authentication
      - Data integrity
      - SSO
      - Inter-organisation decentralized security
  - - - MyProxy can get others creds as needed
  - - - Defines and controls access control policies
      - Community representative gets GSI creds to represent community as a whole.
      - Can also do fine-grained access control to grid resources
      - Steps
        
        User requests access to resource
        
        CAS checks if user has access, and provides proxy certificate with embeded rights
        
        User authenticates with the proxy certificate
        
        Resources applies local policy to determine amount of access given
  - - - SSO
        
        Authenticates users locally
        
        Handles
        
        Contains authentication assertions
        
        Short-lived bearer assertion
        
        Shortlived
        
        Non-identifying
        
        Registered with AA
      - AA (Attribute Authority)
        
        Responds to queries about handle
    - - Assertion Consumer
        
        Parses authentication assertions
      - Attribute Requestor
        
        Requests attributes from AA