linux-kernel - [PATCH 09/14] KEYS: Retry asym key search with partial ID in restrict_link_by

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Date:   Tue, 11 Jan 2022 19:03:13 +0100
From:   Roberto Sassu <roberto.sassu@...wei.com>
To:     <dhowells@...hat.com>, <dwmw2@...radead.org>,
        <herbert@...dor.apana.org.au>, <davem@...emloft.net>
CC:     <keyrings@...r.kernel.org>, <linux-crypto@...r.kernel.org>,
        <linux-integrity@...r.kernel.org>, <linux-fscrypt@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <zohar@...ux.ibm.com>,
        <ebiggers@...nel.org>, Roberto Sassu <roberto.sassu@...wei.com>
Subject: [PATCH 09/14] KEYS: Retry asym key search with partial ID in restrict_link_by_signature()

Retry asymmetric key search in restrict_link_by_signature() to support the
case of partial IDs, provided by PGP signatures (only the last 8 bytes).

Although recently draft-ietf-openpgp-rfc4880bis-10 supports the signature
subpacket type 33, which contains the full issuer fingerprint, we cannot
rely on existing signatures to support it.

Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
---
 crypto/asymmetric_keys/restrict.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/crypto/asymmetric_keys/restrict.c b/crypto/asymmetric_keys/restrict.c
index 84cefe3b3585..f1ad1862ee9d 100644
--- a/crypto/asymmetric_keys/restrict.c
+++ b/crypto/asymmetric_keys/restrict.c
@@ -97,8 +97,14 @@ int restrict_link_by_signature(struct key *dest_keyring,
 	key = find_asymmetric_key(trust_keyring,
 				  sig->auth_ids[0], sig->auth_ids[1],
 				  false);
-	if (IS_ERR(key))
-		return -ENOKEY;
+	if (IS_ERR(key)) {
+		/* Retry with a partial ID. */
+		key = find_asymmetric_key(trust_keyring,
+					  sig->auth_ids[0], sig->auth_ids[1],
+					  true);
+		if (IS_ERR(key))
+			return -ENOKEY;
+	}
 
 	if (use_builtin_keys && !test_bit(KEY_FLAG_BUILTIN, &key->flags))
 		ret = -ENOKEY;
-- 
2.32.0