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Complex policy expressions #134

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68d0ad6
test-enroll.sh: Quiet shellcheck integration check
nicowilliams Jul 31, 2021
92dab53
Complex policy expressions
nicowilliams Jul 22, 2021
a1c13c7
Rename "EK method" to "WK method"
nicowilliams Jul 26, 2021
5d3109d
attest-enroll: Fix POLICIES not set error
nicowilliams Jul 28, 2021
5babb5b
Makefile: shellcheck tests/test-enroll.sh too
nicowilliams Jul 29, 2021
db6adcb
sbin/tpm2-policy: Support reading policy from file
nicowilliams Jul 28, 2021
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1 change: 1 addition & 0 deletions Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -307,6 +307,7 @@ shellcheck:
sbin/tpm2-recv \
sbin/tpm2-policy \
initramfs/*/* \
tests/test-enroll.sh \
; do \
shellcheck $$file functions.sh ; \
done
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4 changes: 2 additions & 2 deletions docs/attest-enroll.md
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Expand Up @@ -93,14 +93,14 @@ Decryption is implemented by [`sbin/tpm2-recv`](/sbin/tpm2-recv).

Two methods are possible for encryption to a target TPM's `EKpub`:

- the "EK" method (our name for it)
- the "WK" method (our name for it)
- the "TK" method (our name for it)

Both methods support setting a policy on the ciphertext such that any
application using the target's TPM to decrypt it must first execute and
satisfy that policy.

The "EK" method uses `TPM2_MakeCredential()` via tpm2-tools' `tpm2
The "WK" method uses `TPM2_MakeCredential()` via tpm2-tools' `tpm2
makecredential` command, using the `none` TCTI (i.e., implemented in
software). The target's `EKpub` is used as the `handle` input parameter
to `TPM2_MakeCredential()`. A well-known key (`WK`), and the desired policy
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