[svn-upgrade] Integrating new upstream version, shadow (19990709)

libmisc/sub.c

@@ -0,0 +1,78 @@
+/*
+ * Copyright 1989 - 1991, Julianne Frances Haugh
+ * 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. Neither the name of Julianne F. Haugh nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JULIE HAUGH 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 JULIE HAUGH 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 "rcsid.h"
+RCSID("$Id: sub.c,v 1.6 1999/03/07 19:14:43 marekm Exp $")
+
+#include <sys/types.h>
+#include "prototypes.h"
+#include "defines.h"
+
+#include <pwd.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 (1);
+	}
+
+	/*
+	 * The directory must be accessible and the current process
+	 * must be able to change into it.
+	 */
+
+	if (chdir (pw->pw_dir) || chroot (pw->pw_dir)) {
+		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 (1);
+	}
+}