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Diffstat (limited to 'libmisc/sub.c')
| -rw-r--r-- | libmisc/sub.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/libmisc/sub.c b/libmisc/sub.c new file mode 100644 index 0000000..b0e32d1 --- /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 "$Id$" + +#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 presence 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); + } +} + |