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Diffstat (limited to 'libmisc/sulog.c')
| -rw-r--r-- | libmisc/sulog.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/libmisc/sulog.c b/libmisc/sulog.c new file mode 100644 index 00000000..5d366175 --- /dev/null +++ b/libmisc/sulog.c @@ -0,0 +1,106 @@ +/* + * Copyright (c) 1989 - 1992, Julianne Frances Haugh + * Copyright (c) 1996 - 2000, Marek Michałkiewicz + * Copyright (c) 2001 - 2005, Tomasz Kłoczko + * Copyright (c) 2008 - 2010, 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: sulog.c 3231 2010-08-22 13:04:54Z nekral-guest $" + +#include <sys/types.h> +#include <sys/stat.h> +#include <stdio.h> +#include <time.h> +#include "prototypes.h" +#include "defines.h" +#include "getdef.h" + +/* + * sulog - log a SU command execution result + */ +void sulog (const char *tty, bool success, const char *oldname, const char *name) +{ + const char *sulog_file; + time_t now; + struct tm *tm; + FILE *fp; + mode_t oldmask; + gid_t oldgid = 0; + + if (success) { + SYSLOG ((LOG_INFO, + "Successful su for %s by %s",name,oldname)); + } else { + SYSLOG ((LOG_NOTICE, + "FAILED su for %s by %s",name,oldname)); + } + + sulog_file = getdef_str ("SULOG_FILE"); + if (NULL == sulog_file) { + return; + } + + oldgid = getgid (); + oldmask = umask (077); + /* Switch to group root to avoid creating the sulog file with + * the wrong group ownership. */ + if ((oldgid != 0) && (setgid (0) != 0)) { + SYSLOG ((LOG_INFO, + "su session not logged to %s", sulog_file)); + /* Continue, but do not switch back to oldgid later */ + oldgid = 0; + } + fp = fopen (sulog_file, "a+"); + (void) umask (oldmask); + if ((oldgid != 0) && (setgid (oldgid) != 0)) { + perror ("setgid"); + SYSLOG ((LOG_ERR, + "can't switch back to group `%d' in sulog", + oldgid)); + /* Do not return if the group permission were raised. */ + exit (EXIT_FAILURE); + } + if (fp == (FILE *) 0) { + return; /* can't open or create logfile */ + } + + (void) time (&now); + tm = localtime (&now); + + fprintf (fp, "SU %.02d/%.02d %.02d:%.02d %c %s %s-%s\n", + tm->tm_mon + 1, tm->tm_mday, tm->tm_hour, tm->tm_min, + success ? '+' : '-', tty, oldname, name); + + (void) fflush (fp); + fsync (fileno (fp)); + fclose (fp); + /* TODO: log if failure */ +} + |