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authorDavid Howells <dhowells@redhat.com>2013-08-30 16:18:31 +0100
committerDavid Howells <dhowells@redhat.com>2013-09-25 17:17:01 +0100
commit17334cabc814f8847975cddc0e29291af6093464 (patch)
tree0f4574a955b501557c04c4381d51dbaa439c9473 /crypto
parent2ecdb23b8c545fbee95caad0f2e45082787563ee (diff)
downloadlinux-sh-17334cabc814f8847975cddc0e29291af6093464.tar.gz
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 <dhowells@redhat.com> Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Josh Boyer <jwboyer@redhat.com>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/asymmetric_keys/x509_public_key.c9
1 files 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;