linux-kernel - [PATCH 5/5] ima: add support for rsa pss verification

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Message-Id: <1617714686-25754-6-git-send-email-herbert.tencent@gmail.com>
Date:   Tue,  6 Apr 2021 21:11:26 +0800
From:   Hongbo Li <herbert.tencent@...il.com>
To:     keyrings@...r.kernel.org, linux-crypto@...r.kernel.org,
        herbert@...dor.apana.org.au, dhowells@...hat.com,
        zohar@...ux.ibm.com, jarkko@...nel.org, herberthbli@...cent.com
Cc:     linux-kernel@...r.kernel.org, linux-integrity@...r.kernel.org
Subject: [PATCH 5/5] ima: add support for rsa pss verification

From: Hongbo Li <herberthbli@...cent.com>

This patch adds support for ima verification for rsa with
pss encoding.

And a patch for ima-evm-utils will be sent later.

Signed-off-by: Hongbo Li <herberthbli@...cent.com>
---
 security/integrity/digsig_asymmetric.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/security/integrity/digsig_asymmetric.c b/security/integrity/digsig_asymmetric.c
index 183f452..ef7a51a 100644
--- a/security/integrity/digsig_asymmetric.c
+++ b/security/integrity/digsig_asymmetric.c
@@ -85,6 +85,7 @@ int asymmetric_verify(struct key *keyring, const char *sig,
 	struct public_key_signature pks;
 	struct signature_v2_hdr *hdr = (struct signature_v2_hdr *)sig;
 	const struct public_key *pk;
+	struct public_key_signature *cert_sig;
 	struct key *key;
 	int ret;
 
@@ -110,7 +111,11 @@ int asymmetric_verify(struct key *keyring, const char *sig,
 	pk = asymmetric_key_public_key(key);
 	pks.pkey_algo = pk->pkey_algo;
 	if (!strcmp(pk->pkey_algo, "rsa")) {
-		pks.encoding = "pkcs1";
+		cert_sig = key->payload.data[asym_auth];
+		if (cert_sig)
+			pks.encoding = cert_sig->encoding;
+		else
+			pks.encoding = "pkcs1";
 	} else if (!strncmp(pk->pkey_algo, "ecdsa-", 6)) {
 		/* edcsa-nist-p192 etc. */
 		pks.encoding = "x962";
-- 
1.8.3.1