Commit 9552c7ae authored by David Howells's avatar David Howells
Browse files

modsign: Make sign-file determine the format of the X.509 cert 



Make sign-file determine the format of the X.509 certificate by reading the
first two bytes and seeing if the first byte is 0x30 and the second
0x81-0x84.  If this is the case, assume it's DER encoded, otherwise assume
it to be PEM encoded.

Without this, it gets awkward to deal with the error messages from
d2i_X509_bio() when we want to call BIO_reset() and then PEM_read_bio() in
case the certificate was PEM encoded rather than X.509 encoded.

Reported-by: default avatarBen Hutchings <ben@decadent.org.uk>
Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Tested-by: default avatarBen Hutchings <ben@decadent.org.uk>
cc: David Woodhouse <dwmw2@infradead.org>
cc: Juerg Haefliger <juerg.haefliger@hpe.com>
cc: Ben Hutchings <ben@decadent.org.uk>
parent 965475ac

scripts/sign-file.c

+26 −8
Original line number Diff line number Diff line 
/* Sign a module file using the given key.

 *

 * Copyright © 2014-2015 Red Hat, Inc. All Rights Reserved.

 * Copyright © 2014-2016 Red Hat, Inc. All Rights Reserved.

 * Copyright © 2015      Intel Corporation.

 * Copyright © 2016      Hewlett Packard Enterprise Development LP

 *
@@ -167,19 +167,37 @@ static EVP_PKEY *read_private_key(const char *private_key_name) 


static X509 *read_x509(const char *x509_name)

{

	unsigned char buf[2];

	X509 *x509;

	BIO *b;

	int n;



	b = BIO_new_file(x509_name, "rb");

	ERR(!b, "%s", x509_name);

	x509 = d2i_X509_bio(b, NULL); /* Binary encoded X.509 */

	if (!x509) {

		ERR(BIO_reset(b) != 1, "%s", x509_name);

		x509 = PEM_read_bio_X509(b, NULL, NULL,

					 NULL); /* PEM encoded X.509 */

		if (x509)

			drain_openssl_errors();



	/* Look at the first two bytes of the file to determine the encoding */

	n = BIO_read(b, buf, 2);

	if (n != 2) {

		if (BIO_should_retry(b)) {

			fprintf(stderr, "%s: Read wanted retry\n", x509_name);

			exit(1);

		}

		if (n >= 0) {

			fprintf(stderr, "%s: Short read\n", x509_name);

			exit(1);

		}

		ERR(1, "%s", x509_name);

	}



	ERR(BIO_reset(b) != 0, "%s", x509_name);



	if (buf[0] == 0x30 && buf[1] >= 0x81 && buf[1] <= 0x84)

		/* Assume raw DER encoded X.509 */

		x509 = d2i_X509_bio(b, NULL);

	else

		/* Assume PEM encoded X.509 */

		x509 = PEM_read_bio_X509(b, NULL, NULL, NULL);



	BIO_free(b);

	ERR(!x509, "%s", x509_name);

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