linux/crypto/asymmetric_keys/x509_parser.h
David Howells a5752d11b3 MODSIGN: Fix 32-bit overflow in X.509 certificate validity date checking
The current choice of lifetime for the autogenerated X.509 of 100 years,
putting the validTo date in 2112, causes problems on 32-bit systems where a
32-bit time_t wraps in 2106.  64-bit x86_64 systems seem to be unaffected.

This can result in something like:

	Loading module verification certificates
	X.509: Cert 6e03943da0f3b015ba6ed7f5e0cac4fe48680994 has expired
	MODSIGN: Problem loading in-kernel X.509 certificate (-127)

Or:

	X.509: Cert 6e03943da0f3b015ba6ed7f5e0cac4fe48680994 is not yet valid
	MODSIGN: Problem loading in-kernel X.509 certificate (-129)

Instead of turning the dates into time_t values and comparing, turn the system
clock and the ASN.1 dates into tm structs and compare those piecemeal instead.

Reported-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Josh Boyer <jwboyer@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2012-10-10 20:06:37 +10:30

37 lines
1.3 KiB
C

/* X.509 certificate parser internal definitions
*
* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#include <crypto/public_key.h>
struct x509_certificate {
struct x509_certificate *next;
struct public_key *pub; /* Public key details */
char *issuer; /* Name of certificate issuer */
char *subject; /* Name of certificate subject */
char *fingerprint; /* Key fingerprint as hex */
char *authority; /* Authority key fingerprint as hex */
struct tm valid_from;
struct tm valid_to;
enum pkey_algo pkey_algo : 8; /* Public key algorithm */
enum pkey_algo sig_pkey_algo : 8; /* Signature public key algorithm */
enum pkey_hash_algo sig_hash_algo : 8; /* Signature hash algorithm */
const void *tbs; /* Signed data */
size_t tbs_size; /* Size of signed data */
const void *sig; /* Signature data */
size_t sig_size; /* Size of sigature */
};
/*
* x509_cert_parser.c
*/
extern void x509_free_certificate(struct x509_certificate *cert);
extern struct x509_certificate *x509_cert_parse(const void *data, size_t datalen);