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powerpc/ima: Define trusted boot policy

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This patch defines an arch-specific trusted boot only policy and a
combined secure and trusted boot policy.

Signed-off-by: Nayna Jain <nayna@linux.ibm.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1572492694-6520-5-git-send-email-zohar@linux.ibm.com
This commit is contained in:
Nayna Jain 2019-10-30 23:31:29 -04:00 committed by Michael Ellerman
parent 2702809a4a
commit 1917855f4e
1 changed files with 32 additions and 1 deletions
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33
arch/powerpc/kernel/ima_arch.c
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@ -30,6 +30,32 @@ static const char *const secure_rules[] = {
NULL
};
/*
* The "trusted_rules" are enabled only on "trustedboot" enabled systems.
* These rules add the kexec kernel image and kernel modules file hashes to
* the IMA measurement list.
*/
static const char *const trusted_rules[] = {
"measure func=KEXEC_KERNEL_CHECK",
"measure func=MODULE_CHECK",
NULL
};
/*
* The "secure_and_trusted_rules" contains rules for both the secure boot and
* trusted boot. The "template=ima-modsig" option includes the appended
* signature, when available, in the IMA measurement list.
*/
static const char *const secure_and_trusted_rules[] = {
"measure func=KEXEC_KERNEL_CHECK template=ima-modsig",
"measure func=MODULE_CHECK template=ima-modsig",
"appraise func=KEXEC_KERNEL_CHECK appraise_type=imasig|modsig",
#ifndef CONFIG_MODULE_SIG_FORCE
"appraise func=MODULE_CHECK appraise_type=imasig|modsig",
#endif
NULL
};
/*
* Returns the relevant IMA arch-specific policies based on the system secure
* boot state.
@ -37,7 +63,12 @@ static const char *const secure_rules[] = {
const char *const *arch_get_ima_policy(void)
{
if (is_ppc_secureboot_enabled())
return secure_rules;
if (is_ppc_trustedboot_enabled())
return secure_and_trusted_rules;
else
return secure_rules;
else if (is_ppc_trustedboot_enabled())
return trusted_rules;
return NULL;
}