[image] Add the "imgtrust" and "imgverify" commands

Signed-off-by: Michael Brown <mcb30@ipxe.org>

1 files changed, 81 insertions, 0 deletions

diff --git a/src/usr/imgtrust.c b/src/usr/imgtrust.c
new file mode 100644
index 00000000..5ea20265
--- /dev/null
+++ b/src/usr/imgtrust.c
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stdlib.h>
+#include <errno.h>
+#include <time.h>
+#include <ipxe/uaccess.h>
+#include <ipxe/image.h>
+#include <ipxe/cms.h>
+#include <usr/imgtrust.h>
+
+/** @file
+ *
+ * Image trust management
+ *
+ */
+
+/**
+ * Verify image using downloaded signature
+ *
+ * @v image		Image to verify
+ * @v signature		Image containing signature
+ * @v name		Required common name, or NULL to allow any name
+ * @ret rc		Return status code
+ */
+int imgverify ( struct image *image, struct image *signature,
+		const char *name ) {
+	size_t len;
+	void *data;
+	struct cms_signature sig;
+	time_t now;
+	int rc;
+
+	/* Mark image as untrusted */
+	image_untrust ( image );
+
+	/* Copy signature to internal memory */
+	len = signature->len;
+	data = malloc ( len );
+	if ( ! data ) {
+		rc = -ENOMEM;
+		goto err_alloc;
+	}
+	copy_from_user ( data, signature->data, 0, len );
+
+	/* Parse signature */
+	if ( ( rc = cms_parse ( &sig, data, len ) ) != 0 )
+		goto err_parse;
+
+	/* Use signature to verify image */
+	now = time ( NULL );
+	if ( ( rc = cms_verify ( &sig, image->data, image->len,
+				 name, now, NULL ) ) != 0 )
+		goto err_verify;
+
+	/* Mark image as trusted */
+	image_trust ( image );
+
+ err_verify:
+ err_parse:
+	free ( data );
+ err_alloc:
+	return rc;
+}