Implement replay attack mitigation for SAML auth.

 






 

 


  Review Request #12476
  —
  Created July 18, 2022 and submitted  — Latest diff uploaded 

 


















 

  

   Information

  





 
 

  david
 









 
 

  Review Board
 









 
 

  release-5.0.x
 









 
 

  
 









 
 

  
 






 




 

  

   Reviewers

  





 
 

  reviewboard
 









 
 

  
 






 








 





  


 
 

  
SAML is generally quite secure by design, but if there's a man in the

middle, it is susceptible to replay attacks (within a short limited time

frame). The way this is mitigated is by giving every message and

assertion a unique ID. The service provider can then store these IDs and

make sure that they haven't already been used.


This change implements that. The used IDs are kept in the cache, and

checked before we proceed. While using the cache for this isn't 100%

reliable, given the very short message lifetime, it's good enough for

our purposes.

 








  


 
 

  
    

  • Ran unit tests.
    • 

  • Verified that I could still log in with SAML.
    • 

  • Crafted a replay and saw that it was successfully blocked.
    • 


 







 









 





  








 




 







   

    
    
Diff Revision 4 (Latest)



    

 

 

 

 
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     Implement replay attack mitigation for SAML auth.
     
SAML is generally quite secure by design, but if there's a man in the
middle, it is susceptible to replay attacks (within a short limited time
frame). The way this is mitigated is by giving every message and
assertion a unique ID. The service provider can then store these IDs and
make sure that they haven't already been used.

This change implements that. The used IDs are kept in the cache, and
checked before we proceed. While using the cache for this isn't 100%
reliable, given the very short message lifetime, it's good enough for
our purposes.

Testing Done:
- Ran unit tests.
- Verified that I could still log in with SAML.
- Crafted a replay and saw that it was successfully blocked.

Reviewed at https://reviews.reviewboard.org/r/12476/

    

   
  		
  d2a809773ca78f6fc3ebd1360bb521711c33b842
  David Trowbridge
 




    


    
    

   

  

 









 

  

   
    

     
      
      reviewboard/accounts/sso/backends/saml/views.py
     
    

   
  

 



 

  

   
    

     
      
      reviewboard/accounts/tests/test_saml_views.py
     
    

   
  

 










     

    

   

  

  

   
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