linux-kernel - [PATCH RFC 08/12] integrity: restrict INTEGRITY_KEYRING_MOK to restrict_link_by_secondary_trusted_or

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Date:   Tue,  6 Jul 2021 22:43:59 -0400
From:   Eric Snowberg <eric.snowberg@...cle.com>
To:     keyrings@...r.kernel.org, linux-integrity@...r.kernel.org,
        zohar@...ux.ibm.com, dhowells@...hat.com, dwmw2@...radead.org,
        herbert@...dor.apana.org.au, davem@...emloft.net,
        jarkko@...nel.org, jmorris@...ei.org, serge@...lyn.com
Cc:     eric.snowberg@...cle.com, keescook@...omium.org,
        gregkh@...uxfoundation.org, torvalds@...ux-foundation.org,
        scott.branden@...adcom.com, weiyongjun1@...wei.com,
        nayna@...ux.ibm.com, ebiggers@...gle.com, ardb@...nel.org,
        nramas@...ux.microsoft.com, lszubowi@...hat.com,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        James.Bottomley@...senPartnership.com, pjones@...hat.com,
        glin@...e.com, konrad.wilk@...cle.com
Subject: [PATCH RFC 08/12] integrity: restrict INTEGRITY_KEYRING_MOK to restrict_link_by_secondary_trusted_or_ca

Set the restriction check for INTEGRITY_KEYRING_MOK keys to
restrict_link_by_secondary_trusted_or_ca.  This will only allow keys
into the mok keyring that are either a CA or trusted by a key contained
within the secondary trusted keyring.

Signed-off-by: Eric Snowberg <eric.snowberg@...cle.com>
---
 security/integrity/digsig.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c
index 56800a5f1e10..07547f1a4806 100644
--- a/security/integrity/digsig.c
+++ b/security/integrity/digsig.c
@@ -140,6 +140,11 @@ int __init integrity_init_keyring(const unsigned int id)
 		return -ENOMEM;
 
 	restriction->check = restrict_link_to_ima;
+	if (id == INTEGRITY_KEYRING_MOK)
+		restriction->check = restrict_link_by_secondary_trusted_or_ca;
+	else
+		restriction->check = restrict_link_to_ima;
+
 	perm |= KEY_USR_WRITE;
 
 out:
-- 
2.18.4