1 files changed, 106 insertions, 0 deletions
diff --git a/libmisc/chkname.c b/libmisc/chkname.c
new file mode 100644
index 0000000..bdd1e72
--- /dev/null
+++ b/libmisc/chkname.c
@@ -0,0 +1,106 @@
+/*
+ * Copyright (c) 1990 - 1994, Julianne Frances Haugh
+ * Copyright (c) 1996 - 2000, Marek Michałkiewicz
+ * Copyright (c) 2001 - 2005, Tomasz Kłoczko
+ * Copyright (c) 2005 - 2008, Nicolas François
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the copyright holders or contributors may not be used to
+ *    endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * is_valid_user_name(), is_valid_group_name() - check the new user/group
+ * name for validity;
+ * return values:
+ *   true  - OK
+ *   false - bad name
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <ctype.h>
+#include "defines.h"
+#include "chkname.h"
+
+int allow_bad_names = false;
+
+static bool is_valid_name (const char *name)
+{
+	if (allow_bad_names) {
+		return true;
+	}
+
+	/*
+	 * User/group names must match [a-z_][a-z0-9_-]*[$]
+	 */
+
+	if (('\0' == *name) ||
+	    !((('a' <= *name) && ('z' >= *name)) || ('_' == *name))) {
+		return false;
+	}
+
+	while ('\0' != *++name) {
+		if (!(( ('a' <= *name) && ('z' >= *name) ) ||
+		      ( ('0' <= *name) && ('9' >= *name) ) ||
+		      ('_' == *name) ||
+		      ('-' == *name) ||
+		      ( ('$' == *name) && ('\0' == *(name + 1)) )
+		     )) {
+			return false;
+		}
+	}
+
+	return true;
+}
+
+bool is_valid_user_name (const char *name)
+{
+	/*
+	 * User names are limited by whatever utmp can
+	 * handle.
+	 */
+	if (strlen (name) > USER_NAME_MAX_LENGTH) {
+		return false;
+	}
+
+	return is_valid_name (name);
+}
+
+bool is_valid_group_name (const char *name)
+{
+	/*
+	 * Arbitrary limit for group names.
+	 * HP-UX 10 limits to 16 characters
+	 */
+	if (   (GROUP_NAME_MAX_LENGTH > 0)
+	    && (strlen (name) > GROUP_NAME_MAX_LENGTH)) {
+		return false;
+	}
+
+	return is_valid_name (name);
+}
+