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-rw-r--r--libmisc/chowntty.c99
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diff --git a/libmisc/chowntty.c b/libmisc/chowntty.c
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+/*
+ * Copyright (c) 1989 - 1994, Julianne Frances Haugh
+ * Copyright (c) 1996 - 2001, Marek Michałkiewicz
+ * Copyright (c) 2003 - 2005, Tomasz Kłoczko
+ * Copyright (c) 2007 - 2009, 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>
+
+#ident "$Id$"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <errno.h>
+#include <grp.h>
+#include "prototypes.h"
+#include "defines.h"
+#include <pwd.h>
+#include "getdef.h"
+
+/*
+ * chown_tty() sets the login tty to be owned by the new user ID
+ * with TTYPERM modes
+ */
+
+void chown_tty (const struct passwd *info)
+{
+ struct group *grent;
+ gid_t gid;
+
+ /*
+ * See if login.defs has some value configured for the port group
+ * ID. Otherwise, use the user's primary group ID.
+ */
+
+ grent = getgr_nam_gid (getdef_str ("TTYGROUP"));
+ if (NULL != grent) {
+ gid = grent->gr_gid;
+ } else {
+ gid = info->pw_gid;
+ }
+
+ /*
+ * Change the permissions on the TTY to be owned by the user with
+ * the group as determined above.
+ */
+
+ if ( (fchown (STDIN_FILENO, info->pw_uid, gid) != 0)
+ || (fchmod (STDIN_FILENO, (mode_t)getdef_num ("TTYPERM", 0600)) != 0)) {
+ int err = errno;
+
+ fprintf (stderr,
+ _("Unable to change owner or mode of tty stdin: %s"),
+ strerror (err));
+ SYSLOG ((LOG_WARN,
+ "unable to change owner or mode of tty stdin for user `%s': %s\n",
+ info->pw_name, strerror (err)));
+ if (EROFS != err) {
+ closelog ();
+ exit (EXIT_FAILURE);
+ }
+ }
+#ifdef __linux__
+ /*
+ * Please don't add code to chown /dev/vcs* to the user logging in -
+ * it's a potential security hole. I wouldn't like the previous user
+ * to hold the file descriptor open and watch my screen. We don't
+ * have the *BSD revoke() system call yet, and vhangup() only works
+ * for tty devices (which vcs* is not). --marekm
+ */
+#endif
+}
+