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KEYS: trusted: improve scalability of trust source config

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Enabling trusted keys requires at least one trust source implementation
(currently TPM, TEE or CAAM) to be enabled. Currently, this is
done by checking each trust source's config option individually.
This does not scale when more trust sources like the one for DCP
are added, because the condition will get long and hard to read.

Add config HAVE_TRUSTED_KEYS which is set to true by each trust source
once its enabled and adapt the check for having at least one active trust
source to use this option. Whenever a new trust source is added, it now
needs to select HAVE_TRUSTED_KEYS.

Signed-off-by: David Gstir <david@sigma-star.at>
Tested-by: Jarkko Sakkinen <jarkko@kernel.org> # for TRUSTED_KEYS_TPM
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
This commit is contained in:
David Gstir 2024-04-03 09:21:18 +02:00 committed by Jarkko Sakkinen
parent 3d16af0b4c
commit 633cb72fb6
1 changed files with 8 additions and 2 deletions
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10
security/keys/trusted-keys/Kconfig
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@ -1,3 +1,6 @@
config HAVE_TRUSTED_KEYS
bool
config TRUSTED_KEYS_TPM
bool "TPM-based trusted keys"
depends on TCG_TPM >= TRUSTED_KEYS
@ -9,6 +12,7 @@ config TRUSTED_KEYS_TPM
select ASN1_ENCODER
select OID_REGISTRY
select ASN1
select HAVE_TRUSTED_KEYS
help
Enable use of the Trusted Platform Module (TPM) as trusted key
backend. Trusted keys are random number symmetric keys,
@ -20,6 +24,7 @@ config TRUSTED_KEYS_TEE
bool "TEE-based trusted keys"
depends on TEE >= TRUSTED_KEYS
default y
select HAVE_TRUSTED_KEYS
help
Enable use of the Trusted Execution Environment (TEE) as trusted
key backend.
@ -29,10 +34,11 @@ config TRUSTED_KEYS_CAAM
depends on CRYPTO_DEV_FSL_CAAM_JR >= TRUSTED_KEYS
select CRYPTO_DEV_FSL_CAAM_BLOB_GEN
default y
select HAVE_TRUSTED_KEYS
help
Enable use of NXP's Cryptographic Accelerator and Assurance Module
(CAAM) as trusted key backend.
if !TRUSTED_KEYS_TPM && !TRUSTED_KEYS_TEE && !TRUSTED_KEYS_CAAM
comment "No trust source selected!"
if !HAVE_TRUSTED_KEYS
comment "No trust source selected!"
endif