On Thu, 28 Sep 2023 19:32:32 +0200
Lukas Wunner <lukas@xxxxxxxxx> wrote:
> The upcoming support for PCI device authentication with CMA-SPDM
> (PCIe r6.1 sec 6.31) requires validating the Subject Alternative Name
> in X.509 certificates.
>
> High-level functions for X.509 parsing such as key_create_or_update()
> throw away the internal, low-level struct x509_certificate after
> extracting the struct public_key and public_key_signature from it.
> The Subject Alternative Name is thus inaccessible when using those
> functions.
>
> Afford CMA-SPDM access to the Subject Alternative Name by making struct
> x509_certificate public, together with the functions for parsing an
> X.509 certificate into such a struct and freeing such a struct.
>
> The private header file x509_parser.h previously included <linux/time.h>
> for the definition of time64_t. That definition was since moved to
> <linux/time64.h> by commit 361a3bf00582 ("time64: Add time64.h header
> and define struct timespec64"), so adjust the #include directive as part
> of the move to the new public header file <keys/x509-parser.h>.
>
> No functional change intended.
>
> Signed-off-by: Lukas Wunner <lukas@xxxxxxxxx>
Got to where this is used now in my review and it makes sense there.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
> ---
> crypto/asymmetric_keys/x509_parser.h | 37 +----------------------
> include/keys/x509-parser.h | 44 ++++++++++++++++++++++++++++
> 2 files changed, 45 insertions(+), 36 deletions(-)
> create mode 100644 include/keys/x509-parser.h
>
> diff --git a/crypto/asymmetric_keys/x509_parser.h b/crypto/asymmetric_keys/x509_parser.h
> index a299c9c56f40..a7ef43c39002 100644
> --- a/crypto/asymmetric_keys/x509_parser.h
> +++ b/crypto/asymmetric_keys/x509_parser.h
> @@ -5,40 +5,7 @@
> * Written by David Howells (dhowells@xxxxxxxxxx)
> */
>
> -#include <linux/time.h>
> -#include <crypto/public_key.h>
> -#include <keys/asymmetric-type.h>
> -
> -struct x509_certificate {
> - struct x509_certificate *next;
> - struct x509_certificate *signer; /* Certificate that signed this one */
> - struct public_key *pub; /* Public key details */
> - struct public_key_signature *sig; /* Signature parameters */
> - char *issuer; /* Name of certificate issuer */
> - char *subject; /* Name of certificate subject */
> - struct asymmetric_key_id *id; /* Issuer + Serial number */
> - struct asymmetric_key_id *skid; /* Subject + subjectKeyId (optional) */
> - time64_t valid_from;
> - time64_t valid_to;
> - const void *tbs; /* Signed data */
> - unsigned tbs_size; /* Size of signed data */
> - unsigned raw_sig_size; /* Size of signature */
> - const void *raw_sig; /* Signature data */
> - const void *raw_serial; /* Raw serial number in ASN.1 */
> - unsigned raw_serial_size;
> - unsigned raw_issuer_size;
> - const void *raw_issuer; /* Raw issuer name in ASN.1 */
> - const void *raw_subject; /* Raw subject name in ASN.1 */
> - unsigned raw_subject_size;
> - unsigned raw_skid_size;
> - const void *raw_skid; /* Raw subjectKeyId in ASN.1 */
> - unsigned index;
> - bool seen; /* Infinite recursion prevention */
> - bool verified;
> - bool self_signed; /* T if self-signed (check unsupported_sig too) */
> - bool unsupported_sig; /* T if signature uses unsupported crypto */
> - bool blacklisted;
> -};
> +#include <keys/x509-parser.h>
>
> /*
> * selftest.c
> @@ -52,8 +19,6 @@ static inline int fips_signature_selftest(void) { return 0; }
> /*
> * 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);
> extern int x509_decode_time(time64_t *_t, size_t hdrlen,
> unsigned char tag,
> const unsigned char *value, size_t vlen);
> diff --git a/include/keys/x509-parser.h b/include/keys/x509-parser.h
> new file mode 100644
> index 000000000000..7c2ebc84791f
> --- /dev/null
> +++ b/include/keys/x509-parser.h
> @@ -0,0 +1,44 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +/* X.509 certificate parser
> + *
> + * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
> + * Written by David Howells (dhowells@xxxxxxxxxx)
> + */
> +
> +#include <crypto/public_key.h>
> +#include <keys/asymmetric-type.h>
> +#include <linux/time64.h>
> +
> +struct x509_certificate {
> + struct x509_certificate *next;
> + struct x509_certificate *signer; /* Certificate that signed this one */
> + struct public_key *pub; /* Public key details */
> + struct public_key_signature *sig; /* Signature parameters */
> + char *issuer; /* Name of certificate issuer */
> + char *subject; /* Name of certificate subject */
> + struct asymmetric_key_id *id; /* Issuer + Serial number */
> + struct asymmetric_key_id *skid; /* Subject + subjectKeyId (optional) */
> + time64_t valid_from;
> + time64_t valid_to;
> + const void *tbs; /* Signed data */
> + unsigned tbs_size; /* Size of signed data */
> + unsigned raw_sig_size; /* Size of signature */
> + const void *raw_sig; /* Signature data */
> + const void *raw_serial; /* Raw serial number in ASN.1 */
> + unsigned raw_serial_size;
> + unsigned raw_issuer_size;
> + const void *raw_issuer; /* Raw issuer name in ASN.1 */
> + const void *raw_subject; /* Raw subject name in ASN.1 */
> + unsigned raw_subject_size;
> + unsigned raw_skid_size;
> + const void *raw_skid; /* Raw subjectKeyId in ASN.1 */
> + unsigned index;
> + bool seen; /* Infinite recursion prevention */
> + bool verified;
> + bool self_signed; /* T if self-signed (check unsupported_sig too) */
> + bool unsupported_sig; /* T if signature uses unsupported crypto */
> + bool blacklisted;
> +};
> +
> +struct x509_certificate *x509_cert_parse(const void *data, size_t datalen);
> +void x509_free_certificate(struct x509_certificate *cert);
