Imported Upstream version 4.1.5.1

2013-07-27 18:42:08 +02:00
parent 6d11fd0a58
commit db1dc7288b
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+/*
+ * Copyright (c) 1991       , Julianne Frances Haugh
+ * Copyright (c) 1991       , Chip Rosenthal
+ * Copyright (c) 1996 - 1998, Marek Michałkiewicz
+ * Copyright (c) 2003 - 2005, Tomasz Kłoczko
+ * Copyright (c) 2007 - 2010, 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.
+ */
+
+#include <config.h>
+#include "defines.h"
+#include <stdio.h>
+#include "getdef.h"
+#include "prototypes.h"
+
+#ident "$Id: console.c 3289 2010-11-19 21:54:41Z nekral-guest $"
+
+/* local function prototypes */
+static bool is_listed (const char *cfgin, const char *tty, bool def);
+
+/*
+ * This is now rather generic function which decides if "tty" is listed
+ * under "cfgin" in config (directly or indirectly). Fallback to default if
+ * something is bad.
+ */
+static bool is_listed (const char *cfgin, const char *tty, bool def)
+{
+	FILE *fp;
+	char buf[200], *s;
+	const char *cons;
+
+	/*
+	 * If the CONSOLE configuration definition isn't given,
+	 * fallback to default.
+	 */
+
+	cons = getdef_str (cfgin);
+	if (NULL == cons) {
+		return def;
+	}
+
+	/*
+	 * If this isn't a filename, then it is a ":" delimited list of
+	 * console devices upon which root logins are allowed.
+	 */
+
+	if (*cons != '/') {
+		char *pbuf;
+		strcpy (buf, cons);
+		pbuf = &buf[0];
+		while ((s = strtok (pbuf, ":")) != NULL) {
+			if (strcmp (s, tty) == 0) {
+				return true;
+			}
+
+			pbuf = NULL;
+		}
+		return false;
+	}
+
+	/*
+	 * If we can't open the console list, then call everything a
+	 * console - otherwise root will never be allowed to login.
+	 */
+
+	fp = fopen (cons, "r");
+	if (NULL == fp) {
+		return def;
+	}
+
+	/*
+	 * See if this tty is listed in the console file.
+	 */
+
+	while (fgets (buf, (int) sizeof (buf), fp) != NULL) {
+		buf[strlen (buf) - 1] = '\0';
+		if (strcmp (buf, tty) == 0) {
+			(void) fclose (fp);
+			return true;
+		}
+	}
+
+	/*
+	 * This tty isn't a console.
+	 */
+
+	(void) fclose (fp);
+	return false;
+}
+
+/*
+ * console - return 1 if the "tty" is a console device, else 0.
+ *
+ * Note - we need to take extreme care here to avoid locking out root logins
+ * if something goes awry.  That's why we do things like call everything a
+ * console if the consoles file can't be opened.  Because of this, we must
+ * warn the user to protect against the remove of the consoles file since
+ * that would allow an unauthorized root login.
+ */
+
+bool console (const char *tty)
+{
+	if (strncmp (tty, "/dev/", 5) == 0) {
+		tty += 5;
+	}
+
+	return is_listed ("CONSOLE", tty, true);
+}
+