7309690788
TPM2 knows two types of policy sessions: "real" ones and "trial" ones. The latter allow you to calculate a policy hash without this enforcing any policy, which the former do. Typically you want to use the "trial" ones when enrolling, and you have to use the "real" ones for unlocking. So far we used "real" ones for both cases. Which works fine – as long as the policy put together matches the current reality (e.g. the PCR values included in the policy are the ones currently in place in the TPM). Let's switch to using trial sessions for enrolling. First of all this is preparation for later work to implement further policy extensions (for example, policies binding to literally specified PCR values, instead of the once currently measured). But from my perspective more importantly it actually is cleaner, as it communicates more clearly what we are actually doing here. No user-visible change in behaviour. |
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