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This adds a new MoK variable, MokPolicy (&MokPolicyRT) that's intended
as a bitmask of machine owner policy choices, and the bit
MOK_POLICY_REQUIRE_NX. This bit specifies whether it is permissible to
load binaries which do not support NX mitigations, and it currently
defaults to allowing such binaries to be loaded.
The broader intention here is to migrate all of the MoK policy variables
that are really just on/off flags to this variable.
Signed-off-by: Peter Jones <pjones@redhat.com>
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Heavily inspired by Matthew Garrett's patch "Allow additional certificates
to be loaded from a signed binary".
Add support for loading a binary, verifying its signature, and then
scanning it for embedded certificates. This is intended to make it
possible to decouple shim builds from vendor signatures. In order to
add new signatures to shim, an EFI Signature List should be generated
and then added to the .db section of a well-formed EFI binary. This
binary should then be signed with a key that shim already trusts (either
a built-in key, one present in the platform firmware or
one present in MOK) and placed in the same directory as shim with a
filename starting "shim_certificate" (eg, "shim_certificate_oracle").
Shim will read multiple files and incorporate the signatures from all of
them. Note that each section *must* be an EFI Signature List, not a raw
certificate.
Signed-off-by: Eric Snowberg <eric.snowberg@oracle.com>
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Introduce a new MOK variable called MokListTrustedRT. It allows an end-user
to decide if they want to trust MOKList keys within the soon to be booted
Linux kernel. This variable does not change any functionality within shim
itself. When Linux boots, if MokListTrustedRT is set and
EFI_VARIABLE_NON_VOLATILE is not set, keys in MokListRT are loaded into the
.machine keyring instead of the .platform keyring.
Signed-off-by: Eric Snowberg <eric.snowberg@oracle.com>
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This moves the globals from shim.c (and lib/console.c) into their own
file, to make it so that unit tests can more easily link against code
that uses that state.
Signed-off-by: Peter Jones <pjones@redhat.com>
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