Imported Upstream version 4.1.5.1upstream/4.1.5.1

1 files changed, 78 insertions, 0 deletions

diff --git a/libmisc/sub.c b/libmisc/sub.c
new file mode 100644
index 00000000..4a40e58a
--- /dev/null
+++ b/libmisc/sub.c
@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 1989 - 1991, Julianne Frances Haugh
+ * Copyright (c) 1996 - 1999, Marek Michałkiewicz
+ * Copyright (c) 2003 - 2006, Tomasz Kłoczko
+ * 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>
+
+#ident "$Id: sub.c 3232 2010-08-22 19:13:53Z nekral-guest $"
+
+#include <pwd.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include "prototypes.h"
+#include "defines.h"
+#define	BAD_SUBROOT2	"invalid root `%s' for user `%s'\n"
+#define	NO_SUBROOT2	"no subsystem root `%s' for user `%s'\n"
+/*
+ * subsystem - change to subsystem root
+ *
+ *	A subsystem login is indicated by the presense of a "*" as
+ *	the first character of the login shell.  The given home
+ *	directory will be used as the root of a new filesystem which
+ *	the user is actually logged into.
+ */
+void subsystem (const struct passwd *pw)
+{
+	/*
+	 * The new root directory must begin with a "/" character.
+	 */
+
+	if (pw->pw_dir[0] != '/') {
+		printf (_("Invalid root directory '%s'\n"), pw->pw_dir);
+		SYSLOG ((LOG_WARN, BAD_SUBROOT2, pw->pw_dir, pw->pw_name));
+		closelog ();
+		exit (EXIT_FAILURE);
+	}
+
+	/*
+	 * The directory must be accessible and the current process
+	 * must be able to change into it.
+	 */
+
+	if (   (chdir (pw->pw_dir) != 0)
+	    || (chroot (pw->pw_dir) != 0)) {
+		(void) printf (_("Can't change root directory to '%s'\n"),
+		               pw->pw_dir);
+		SYSLOG ((LOG_WARN, NO_SUBROOT2, pw->pw_dir, pw->pw_name));
+		closelog ();
+		exit (EXIT_FAILURE);
+	}
+}
+