[RFC PATCH 4/4] X.509: Handle midnight alternative notation in GeneralizedTime

From: David Howells <dhowells@redhat.com>
To: keyrings@vger.kernel.org
Cc: David Woodhouse <David.Woodhouse@intel.com>,
	Arnd Bergmann <arnd@arndb.de>,
	linux-kernel@vger.kernel.org, dhowells@redhat.com,
	linux-security-module@vger.kernel.org,
	Rudolf Polzer <rpolzer@google.com>,
	John Stultz <john.stultz@linaro.org>
Subject: [RFC PATCH 4/4] X.509: Handle midnight alternative notation in GeneralizedTime
Date: Mon, 04 Jan 2016 22:17:27 +0000	[thread overview]
Message-ID: <20160104221727.19818.76115.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <20160104221658.19818.56223.stgit@warthog.procyon.org.uk>

The ASN.1 GeneralizedTime object carries an ISO 8601 format date and time.
The time is permitted to show midnight as 00:00 or 24:00 (the latter being
equivalent of 00:00 of the following day).

The permitted value is checked in x509_decode_time() but the actual
handling is left to mktime64().

Without this patch, certain X.509 certificates will be rejected and could
lead to an unbootable kernel.

Note that with this patch we also permit any 24:mm:ss time and extend this
to UTCTime, which whilst not strictly correct don't permit much leeway in
fiddling date strings.

Reported-by: Rudolf Polzer <rpolzer@google.com>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: David Woodhouse <David.Woodhouse@intel.com>
cc: John Stultz <john.stultz@linaro.org>
cc: Arnd Bergmann <arnd@arndb.de>
---

 crypto/asymmetric_keys/x509_cert_parser.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crypto/asymmetric_keys/x509_cert_parser.c b/crypto/asymmetric_keys/x509_cert_parser.c
index 3379c0ba3988..70ed0852fdb2 100644
--- a/crypto/asymmetric_keys/x509_cert_parser.c
+++ b/crypto/asymmetric_keys/x509_cert_parser.c
@@ -548,7 +548,7 @@ int x509_decode_time(time64_t *_t,  size_t hdrlen,
 	}
 
 	if (day < 1 || day > mon_len ||
-	    hour > 23 ||
+	    hour > 24 || /* ISO 8601 permits 24:00:00 as midnight tomorrow */
 	    min > 59 ||
 	    sec > 60) /* ISO 8601 permits leap seconds [X.680 46.3] */
 		goto invalid_time;

