[2.7.0] Backport "redwood: Relax requirements for decrypting messages" #7048
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Even if a source key is no longer valid per policy, we still want them to be able to decrypt a previously valid message for them. We can also drop the revocation/expiry filters, which were mostly theoretical in the SecureDrop context anyways. We first try validating the key with the StandardPolicy before trying again with a NullPolicy to avoid downgrade attacks. Since we now have another type of policy being used, the constant has been renamed to STANDARD_POLICY to be clearer what kind it is. Fixes #6991. (cherry picked from commit 3596bb0)
zenmonkeykstop
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Description of Changes
Backport of #7000.
Testing
release/2.7.0