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SPPF Batch DOS Considerations

SPPF Batch DOS Considerations. Jeremy Barkan Xconnect 28 March 2012. SPPF & SOAP Security. Framework draft – connection oriented, session HTTPS + digest authentication SOAP draft – SOAP over HTTPS with digest authentication Batch requires message security vs. transport security

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SPPF Batch DOS Considerations

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  1. SPPF Batch DOS Considerations Jeremy Barkan Xconnect 28 March 2012

  2. SPPF & SOAP Security • Framework draft – connection oriented, session HTTPS + digest authentication • SOAP draft – SOAP over HTTPS with digest authentication • Batch requires message security vs. transport security • Actors SPPF batch user cases • Registrant - acting in the batch commands • Session client - provides the batch upload • Registry • Threats • Malicious XML Document • Authorized client, Illegitimate registrant - posts malicious batch request XML document • Legitimate registrant - possible Zombie - posts malicious XML document

  3. Malicious SOAP Documents • XML Parsing DOS • Coercive Parsing • Oversize Payload • SPPF behavioral DOS on registry • Table scan queries • Massive inserts • Massive roll back at end of long batch • Stop and Roll-Back see SOAP Draft • http://tools.ietf.org/html/draft-ietf-drinks-spp-protocol-over-soap-01#section-6.2.5 • produces resource starvation of the registry • http://tools.ietf.org/html/rfc4732#page-5 • https://www.owasp.org/index.php/Web_Service_Security_Cheat_Sheet • http://msdn.microsoft.com/en-us/library/ff650168.aspx

  4. Defenses • Authenticate Registrant - message security • Require XML Signatures WS-SECURITY [ WS-I Basic Security Profile ] • http://www.ws-i.org/Profiles/BasicSecurityProfile-1.0.html • File level • Block level • However - WS-Security - high overhead • Streaming Processing of WS-Security • http://www.sundaychennai.com/dotnet_iee2011/Server-Side%20Streaming%20Processing%20of%20WS-Security.pdf • Application Level Gateways / WS Firewall • Schema Validation • http://www.mendeley.com/research/protecting-web-services-dos-attacks-soap-message-validation/

  5. SPPF Specific Defenses • Deep Inspection • Analysis of batch file before processing • Behavioral Analysis • Do these commands make sense for this registrant • Do the commands make sense in sequence • Do the commands make sense given this registrants command history • Resource Cost Scrip • Assign a cost to each command • Registrants get a “budget” • http://www.cs.columbia.edu/~angelos/Papers/sosmp.pdf

  6. Implications for SPPF SOAP and Batch • Batch processing use cases not covered in use case draft • Failure modes • Security considerations • Still maintain should be a separate protocol draft

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