2b22a6909d
Closes #325 Add a new subid_init() function which can be used to specify the stream on which error messages should be printed. (If you want to get fancy you can redirect that to memory :) If subid_init() is not called, use stderr. If NULL is passed, then /dev/null will be used. This patch also fixes up the 'Prog', which previously had to be defined by any program linking against libsubid. Now, by default in libsubid it will show (subid). Once subid_init() is called, it will use the first variable passed to subid_init(). Signed-off-by: Serge Hallyn <serge@hallyn.com>
100 lines
3.3 KiB
C
100 lines
3.3 KiB
C
/*
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* Copyright (c) 1989 - 1994, Julianne Frances Haugh
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* Copyright (c) 1996 - 2001, Marek Michałkiewicz
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* Copyright (c) 2003 - 2005, Tomasz Kłoczko
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* Copyright (c) 2007 - 2009, Nicolas François
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the copyright holders or contributors may not be used to
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* endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <config.h>
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#ident "$Id$"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#include <errno.h>
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#include <grp.h>
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#include "prototypes.h"
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#include "defines.h"
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#include <pwd.h>
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#include "getdef.h"
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/*
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* chown_tty() sets the login tty to be owned by the new user ID
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* with TTYPERM modes
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*/
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void chown_tty (const struct passwd *info)
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{
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struct group *grent;
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gid_t gid;
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/*
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* See if login.defs has some value configured for the port group
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* ID. Otherwise, use the user's primary group ID.
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*/
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grent = getgr_nam_gid (getdef_str ("TTYGROUP"));
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if (NULL != grent) {
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gid = grent->gr_gid;
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} else {
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gid = info->pw_gid;
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}
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/*
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* Change the permissions on the TTY to be owned by the user with
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* the group as determined above.
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*/
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if ( (fchown (STDIN_FILENO, info->pw_uid, gid) != 0)
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|| (fchmod (STDIN_FILENO, (mode_t)getdef_num ("TTYPERM", 0600)) != 0)) {
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int err = errno;
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fprintf (shadow_logfd,
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_("Unable to change owner or mode of tty stdin: %s"),
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strerror (err));
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SYSLOG ((LOG_WARN,
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"unable to change owner or mode of tty stdin for user `%s': %s\n",
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info->pw_name, strerror (err)));
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if (EROFS != err) {
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closelog ();
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exit (EXIT_FAILURE);
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}
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}
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#ifdef __linux__
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/*
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* Please don't add code to chown /dev/vcs* to the user logging in -
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* it's a potential security hole. I wouldn't like the previous user
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* to hold the file descriptor open and watch my screen. We don't
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* have the *BSD revoke() system call yet, and vhangup() only works
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* for tty devices (which vcs* is not). --marekm
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*/
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#endif
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}
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