From 2ecdb23b8c545fbee95caad0f2e45082787563ee Mon Sep 17 00:00:00 2001 From: David Howells Date: Fri, 30 Aug 2013 16:18:15 +0100 Subject: 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 Signed-off-by: David Howells --- crypto/asymmetric_keys/x509_public_key.c | 11 +++++++++++ 1 file changed, 11 insertions(+) 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, -- cgit v1.2.3