Fix BadSignature exception handling in SessionMiddleware #1264
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hanneskuettner
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Great patch, thanks. Eagerly awaiting the release. |
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Just wanted to say I've tested this in my project and it works well. No more non-recoverable Internal Server Errors when passing in malformed session cookies- just an elegant blank session. Glad to see people stress testing exploitation vectors on Starlette to make it more robust! |
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The
SessionMiddlewaredoes not catch all possible exceptions ofTimestampSigner.unsign, specifically there is an edge case where aBadSignatureexception can be raised by the method if a totally bogus session cookie is provided that does not match the expected format.This PR broadens the caught exceptions (since all the other exceptions inherit
BadSignature) and fixes the issue.The issue can be reproduced by running the new test without the fix applied.