Re: [PATCH] X.509: Add messages for obsolete OIDs

[Mimi Zohar]

On Fri, 2019-03-22 at 14:27 +0800, Lee, Chun-Yi wrote:
> We found that the db in Acer machine has self signed certificates
> (CN=DisablePW or CN=ABO) that they used obsolete OID 1.3.14.3.2.29
> sha1WithRSASignature and 2.5.29.1 subjectKeyIdentifier. Kernel
> emits -65 error code when loading those certificates to platform
> keyring:
> 
> [    1.484388] integrity: Loading X.509 certificate: UEFI:MokListRT
> [    1.485557] integrity: Problem loading X.509 certificate -65
> [    1.486100] Error adding keys to platform keyring UEFI:MokListRT
> 
> Because the -65 error code is not enough for appeasing user when
> loading a outdated certificate. This patch add messages against
> 1.3.14.3.2.29 and 2.5.29.1 OIDs.
> 
> Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1129471
> Cc: David Howells <dhowells@xxxxxxxxxx> 
> Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> 
> Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
> Signed-off-by: "Lee, Chun-Yi" <jlee@xxxxxxxx>

Reviewed-by: Mimi Zohar <zohar@xxxxxxxxxxxxx>

> ---
>  crypto/asymmetric_keys/x509_cert_parser.c | 7 +++++++
>  include/linux/oid_registry.h              | 2 ++
>  2 files changed, 9 insertions(+)
> 
> diff --git a/crypto/asymmetric_keys/x509_cert_parser.c b/crypto/asymmetric_keys/x509_cert_parser.c
> index 991f4d735a4e..bbd22d5c5b5d 100644
> --- a/crypto/asymmetric_keys/x509_cert_parser.c
> +++ b/crypto/asymmetric_keys/x509_cert_parser.c
> @@ -192,6 +192,8 @@ int x509_note_pkey_algo(void *context, size_t hdrlen,
>  	pr_debug("PubKey Algo: %u\n", ctx->last_oid);
> 
>  	switch (ctx->last_oid) {
> +	case OID_sha1WithRSASignature:
> +		pr_info("1.3.14.3.2.29 sha1WithRSASignature is obsolete.\n");
>  	case OID_md2WithRSAEncryption:
>  	case OID_md3WithRSAEncryption:
>  	default:
> @@ -464,6 +466,11 @@ int x509_process_extension(void *context, size_t hdrlen,
>  		return 0;
>  	}
> 
> +	if (ctx->last_oid == OID_subjectKeyIdentifier_obsolete) {
> +		pr_info("2.5.29.1 subjectKeyIdentifier OID is obsolete.\n");
> +		return -ENOPKG;
> +	}
> +
>  	return 0;
>  }
> 
> diff --git a/include/linux/oid_registry.h b/include/linux/oid_registry.h
> index d2fa9ca42e9a..0641d5aa2251 100644
> --- a/include/linux/oid_registry.h
> +++ b/include/linux/oid_registry.h
> @@ -62,6 +62,7 @@ enum OID {
> 
>  	OID_certAuthInfoAccess,		/* 1.3.6.1.5.5.7.1.1 */
>  	OID_sha1,			/* 1.3.14.3.2.26 */
> +	OID_sha1WithRSASignature,	/* 1.3.14.3.2.29 */
>  	OID_sha256,			/* 2.16.840.1.101.3.4.2.1 */
>  	OID_sha384,			/* 2.16.840.1.101.3.4.2.2 */
>  	OID_sha512,			/* 2.16.840.1.101.3.4.2.3 */
> @@ -83,6 +84,7 @@ enum OID {
>  	OID_generationalQualifier,	/* 2.5.4.44 */
> 
>  	/* Certificate extension IDs */
> +	OID_subjectKeyIdentifier_obsolete,	/* 2.5.29.1 */
>  	OID_subjectKeyIdentifier,	/* 2.5.29.14 */
>  	OID_keyUsage,			/* 2.5.29.15 */
>  	OID_subjectAltName,		/* 2.5.29.17 */