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Commit 84706caa authored by David Woodhouse's avatar David Woodhouse Committed by David Howells
Browse files

extract-cert: Cope with multiple X.509 certificates in a single file 



This is not required for the module signing key, although it doesn't do any
harm — it just means that any additional certs in the PEM file are also
trusted by the kernel.

But it does allow us to use the extract-cert tool for processing the extra
certs from CONFIG_SYSTEM_TRUSTED_KEYS, instead of that horrid awk|base64
hack.

Also cope with being invoked with no input file, creating an empty output
file as a result.

Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
parent ed8c2076

scripts/extract-cert.c

+46 −12
Original line number Diff line number Diff line
@@ -73,17 +73,34 @@ static void drain_openssl_errors(void) 
	} while(0)



static const char *key_pass;

static BIO *wb;

static char *cert_dst;

int kbuild_verbose;



static void write_cert(X509 *x509)

{

	char buf[200];



	if (!wb) {

		wb = BIO_new_file(cert_dst, "wb");

		ERR(!wb, "%s", cert_dst);

	}

	X509_NAME_oneline(X509_get_subject_name(x509), buf, sizeof(buf));

	ERR(!i2d_X509_bio(wb, x509), cert_dst);

	if (kbuild_verbose)

		fprintf(stderr, "Extracted cert: %s\n", buf);

}



int main(int argc, char **argv)

{

	char *cert_src, *cert_dst;

	X509 *x509;

	BIO *b;

	char *cert_src;



	OpenSSL_add_all_algorithms();

	ERR_load_crypto_strings();

	ERR_clear_error();



	kbuild_verbose = atoi(getenv("KBUILD_VERBOSE")?:"0");



        key_pass = getenv("KBUILD_SIGN_PIN");



	if (argc != 3)
@@ -92,7 +109,13 @@ int main(int argc, char **argv) 
	cert_src = argv[1];

	cert_dst = argv[2];



	if (!strncmp(cert_src, "pkcs11:", 7)) {

	if (!cert_src[0]) {

		/* Invoked with no input; create empty file */

		FILE *f = fopen(cert_dst, "wb");

		ERR(!f, "%s", cert_dst);

		fclose(f);

		exit(0);

	} else if (!strncmp(cert_src, "pkcs11:", 7)) {

		ENGINE *e;

		struct {

			const char *cert_id;
@@ -114,19 +137,30 @@ int main(int argc, char **argv) 
			ERR(!ENGINE_ctrl_cmd_string(e, "PIN", key_pass, 0), "Set PKCS#11 PIN");

		ENGINE_ctrl_cmd(e, "LOAD_CERT_CTRL", 0, &parms, NULL, 1);

		ERR(!parms.cert, "Get X.509 from PKCS#11");

		x509 = parms.cert;

		write_cert(parms.cert);

	} else {

		BIO *b;

		X509 *x509;



		b = BIO_new_file(cert_src, "rb");

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



		while (1) {

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

			if (wb && !x509) {

				unsigned long err = ERR_peek_last_error();

				if (ERR_GET_LIB(err) == ERR_LIB_PEM &&

				    ERR_GET_REASON(err) == PEM_R_NO_START_LINE) {

					ERR_clear_error();

					break;

				}

			}

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

		BIO_free(b);

			write_cert(x509);

		}

	}



	b = BIO_new_file(cert_dst, "wb");

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

	ERR(!i2d_X509_bio(b, x509), cert_dst);

	BIO_free(b);

	BIO_free(wb);



	return 0;

}