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authorDavid Howells <dhowells@redhat.com>2013-08-30 16:18:15 +0100
committerDavid Howells <dhowells@redhat.com>2013-09-25 17:17:01 +0100
commit2ecdb23b8c545fbee95caad0f2e45082787563ee (patch)
tree14884783575a49feb510a7e402747c076c076792 /crypto
parentb426beb6eeb0c81aeaa419f7444064abc9cb04ae (diff)
downloadlinux-linaro-stable-2ecdb23b8c545fbee95caad0f2e45082787563ee.tar.gz
X.509: Check the algorithm IDs obtained from parsing an X.509 certificate
Check that the algorithm IDs obtained from the ASN.1 parse by OID lookup corresponds to algorithms that are available to us. Reported-by: Kees Cook <keescook@chromium.org> Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/asymmetric_keys/x509_public_key.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/crypto/asymmetric_keys/x509_public_key.c b/crypto/asymmetric_keys/x509_public_key.c
index b7c81d8df08b..eb368d4c632c 100644
--- a/crypto/asymmetric_keys/x509_public_key.c
+++ b/crypto/asymmetric_keys/x509_public_key.c
@@ -119,6 +119,17 @@ static int x509_key_preparse(struct key_preparsed_payload *prep)
pr_devel("Cert Issuer: %s\n", cert->issuer);
pr_devel("Cert Subject: %s\n", cert->subject);
+
+ if (cert->pub->pkey_algo >= PKEY_ALGO__LAST ||
+ cert->sig.pkey_algo >= PKEY_ALGO__LAST ||
+ cert->sig.pkey_hash_algo >= PKEY_HASH__LAST ||
+ !pkey_algo[cert->pub->pkey_algo] ||
+ !pkey_algo[cert->sig.pkey_algo] ||
+ !pkey_hash_algo_name[cert->sig.pkey_hash_algo]) {
+ ret = -ENOPKG;
+ goto error_free_cert;
+ }
+
pr_devel("Cert Key Algo: %s\n", pkey_algo_name[cert->pub->pkey_algo]);
pr_devel("Cert Valid From: %04ld-%02d-%02d %02d:%02d:%02d\n",
cert->valid_from.tm_year + 1900, cert->valid_from.tm_mon + 1,