1 files changed, 96 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/com32/menu/passwd.c b/contrib/syslinux-4.02/com32/menu/passwd.c
new file mode 100644
index 0000000..d5cfd08
--- /dev/null
+++ b/contrib/syslinux-4.02/com32/menu/passwd.c
@@ -0,0 +1,96 @@
+/* ----------------------------------------------------------------------- *
+ *
+ *   Copyright 2004-2008 H. Peter Anvin - All Rights Reserved
+ *
+ *   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, Inc., 51 Franklin St, Fifth Floor,
+ *   Boston MA 02110-1301, USA; either version 2 of the License, or
+ *   (at your option) any later version; incorporated herein by reference.
+ *
+ * ----------------------------------------------------------------------- */
+
+#include <string.h>
+#include <xcrypt.h>
+#include <sha1.h>
+#include <base64.h>
+
+#include "menu.h"
+
+static int passwd_compare_sha1(const char *passwd, const char *entry)
+{
+    struct {
+	SHA1_CTX ctx;
+	unsigned char sha1[20], pwdsha1[20];
+    } d;
+    const char *p;
+    int rv;
+
+    SHA1Init(&d.ctx);
+
+    if ((p = strchr(passwd + 3, '$'))) {
+	SHA1Update(&d.ctx, (void *)passwd + 3, p - (passwd + 3));
+	p++;
+    } else {
+	p = passwd + 3;		/* Assume no salt */
+    }
+
+    SHA1Update(&d.ctx, (void *)entry, strlen(entry));
+    SHA1Final(d.sha1, &d.ctx);
+
+    memset(d.pwdsha1, 0, 20);
+    unbase64(d.pwdsha1, 20, p);
+
+    rv = !memcmp(d.sha1, d.pwdsha1, 20);
+
+    memset(&d, 0, sizeof d);
+    return rv;
+}
+
+static int passwd_compare_md5(const char *passwd, const char *entry)
+{
+    const char *crypted = crypt_md5(entry, passwd + 3);
+    int len = strlen(crypted);
+
+    return !strncmp(crypted, passwd, len) &&
+	(passwd[len] == '\0' || passwd[len] == '$');
+}
+
+static int passwd_compare_sha256(const char *passwd, const char *entry)
+{
+    const char *crypted = sha256_crypt(entry, passwd + 3);
+    int len = strlen(crypted);
+
+    return !strncmp(crypted, passwd, len) &&
+	(passwd[len] == '\0' || passwd[len] == '$');
+}
+
+static int passwd_compare_sha512(const char *passwd, const char *entry)
+{
+    const char *crypted = sha512_crypt(entry, passwd + 3);
+    int len = strlen(crypted);
+
+    return !strncmp(crypted, passwd, len) &&
+	(passwd[len] == '\0' || passwd[len] == '$');
+}
+
+int passwd_compare(const char *passwd, const char *entry)
+{
+    if (passwd[0] != '$' || !passwd[1] || passwd[2] != '$') {
+	/* Plaintext passwd, yuck! */
+	return !strcmp(entry, passwd);
+    } else {
+	switch (passwd[1]) {
+	case '1':
+	    return passwd_compare_md5(passwd, entry);
+	case '4':
+	    return passwd_compare_sha1(passwd, entry);
+	case '5':
+	    return passwd_compare_sha256(passwd, entry);
+	case '6':
+	    return passwd_compare_sha512(passwd, entry);
+	default:
+	    return 0;		/* Unknown encryption algorithm -> false */
+	}
+    }
+}