[crypto] Add certstat() to display basic certificate information

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

src/crypto/x509.c

@@ -122,10 +122,10 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 	__einfo_uniqify ( EINFO_EACCES, 0x0b, "No usable certificates" )
 
 /**
- * Get X.509 certificate name (for debugging)
+ * Get X.509 certificate display name
  *
  * @v cert		X.509 certificate
- * @ret name		Name (for debugging)
+ * @ret name		Display name
  */
 const char * x509_name ( struct x509_certificate *cert ) {
 	struct asn1_cursor *common_name = &cert->subject.common_name;

src/include/usr/certmgmt.h

@@ -0,0 +1,16 @@
+#ifndef _USR_CERTMGMT_H
+#define _USR_CERTMGMT_H
+
+/** @file
+ *
+ * Certificate management
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#include <ipxe/x509.h>
+
+extern void certstat ( struct x509_certificate *cert );
+
+#endif /* _USR_CERTMGMT_H */

src/usr/certmgmt.c

@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2016 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., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#include <stdio.h>
+#include <errno.h>
+#include <ipxe/x509.h>
+#include <ipxe/sha1.h>
+#include <ipxe/base16.h>
+#include <usr/certmgmt.h>
+
+/** @file
+ *
+ * Certificate management
+ *
+ */
+
+/**
+ * Display status of a certificate
+ *
+ * @v cert		X.509 certificate
+ */
+void certstat ( struct x509_certificate *cert ) {
+	struct digest_algorithm *digest = &sha1_algorithm;
+	uint8_t fingerprint[ digest->digestsize ];
+	char buf[ base16_encoded_len ( sizeof ( fingerprint ) ) + 1 /* NUL */ ];
+
+	/* Generate fingerprint */
+	x509_fingerprint ( cert, digest, fingerprint );
+	base16_encode ( fingerprint, sizeof ( fingerprint ),
+			buf, sizeof ( buf ) );
+
+	/* Print certificate status */
+	printf ( "%s : %s", x509_name ( cert ), buf );
+	if ( cert->flags & X509_FL_PERMANENT )
+		printf ( " [PERMANENT]" );
+	if ( cert->flags & X509_FL_EXPLICIT )
+		printf ( " [EXPLICIT]" );
+	if ( x509_is_valid ( cert ) )
+		printf ( " [VALIDATED]" );
+	printf ( "\n" );
+}