From 17334cabc814f8847975cddc0e29291af6093464 Mon Sep 17 00:00:00 2001 From: David Howells Date: Fri, 30 Aug 2013 16:18:31 +0100 Subject: [PATCH] X.509: Handle certificates that lack an authorityKeyIdentifier field Handle certificates that lack an authorityKeyIdentifier field by assuming they're self-signed and checking their signatures against themselves. Signed-off-by: David Howells Reviewed-by: Kees Cook Reviewed-by: Josh Boyer --- crypto/asymmetric_keys/x509_public_key.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/crypto/asymmetric_keys/x509_public_key.c b/crypto/asymmetric_keys/x509_public_key.c index eb368d4c632c..0f55e3b027a0 100644 --- a/crypto/asymmetric_keys/x509_public_key.c +++ b/crypto/asymmetric_keys/x509_public_key.c @@ -143,8 +143,8 @@ static int x509_key_preparse(struct key_preparsed_payload *prep) pkey_algo_name[cert->sig.pkey_algo], pkey_hash_algo_name[cert->sig.pkey_hash_algo]); - if (!cert->fingerprint || !cert->authority) { - pr_warn("Cert for '%s' must have SubjKeyId and AuthKeyId extensions\n", + if (!cert->fingerprint) { + pr_warn("Cert for '%s' must have a SubjKeyId extension\n", cert->subject); ret = -EKEYREJECTED; goto error_free_cert; @@ -190,8 +190,9 @@ static int x509_key_preparse(struct key_preparsed_payload *prep) cert->pub->algo = pkey_algo[cert->pub->pkey_algo]; cert->pub->id_type = PKEY_ID_X509; - /* Check the signature on the key */ - if (strcmp(cert->fingerprint, cert->authority) == 0) { + /* Check the signature on the key if it appears to be self-signed */ + if (!cert->authority || + strcmp(cert->fingerprint, cert->authority) == 0) { ret = x509_check_signature(cert->pub, cert); if (ret < 0) goto error_free_cert; -- 2.20.1