shadow/src/faillog.c

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/*
* Copyright 1989 - 1993, 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>
#ident "$Id$"
#include <getopt.h>
#include <pwd.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>
#include "defines.h"
#include "exitcodes.h"
#include "faillog.h"
#include "prototypes.h"
/*
* Global variables
*/
static FILE *fail; /* failure file stream */
static uid_t user; /* one single user, specified on command line */
static int days; /* number of days to consider for print command */
static time_t seconds; /* that number of days in seconds */
static int
aflg = 0, /* set if all users are to be printed always */
uflg = 0, /* set if user is a valid user id */
tflg = 0; /* print is restricted to most recent days */
static struct stat statbuf; /* fstat buffer for file size */
#define NOW (time((time_t *) 0))
static void usage (void)
{
fprintf (stderr, _("Usage: faillog [options]\n"
"\n"
"Options:\n"
" -a, --all display faillog records for all users\n"
" -h, --help display this help message and exit\n"
" -l, --lock-time SEC after failed login lock accout to SEC seconds\n"
" -m, --maximum MAX set maximum failed login counters to MAX\n"
" -r, --reset reset the counters of login failures\n"
" -t, --time DAYS display faillog records more recent than DAYS\n"
" -u, --user LOGIN display faillog record or maintains failure counters\n"
" and limits (if used with -r, -m or -l options) only\n"
" for user with LOGIN\n"
"\n"));
exit (E_USAGE);
}
static void print_one (const struct faillog *fl, uid_t uid)
{
static int once;
char *cp;
struct tm *tm;
time_t now;
struct passwd *pwent;
#ifdef HAVE_STRFTIME
char ptime[80];
#endif
if (!once) {
printf (_
("Login Failures Maximum Latest On\n"));
once++;
}
pwent = getpwuid (uid);
time (&now);
tm = localtime (&fl->fail_time);
#ifdef HAVE_STRFTIME
strftime (ptime, sizeof (ptime), "%D %H:%M:%S %z", tm);
cp = ptime;
#endif
if (pwent) {
printf ("%-9s %5d %5d ",
pwent->pw_name, fl->fail_cnt, fl->fail_max);
if (fl->fail_time) {
printf ("%s %s", cp, fl->fail_line);
if (fl->fail_locktime) {
if (fl->fail_time + fl->fail_locktime > now
&& fl->fail_cnt)
printf (_(" [%lds left]"),
fl->fail_time +
fl->fail_locktime - now);
else
printf (_(" [%lds lock]"),
fl->fail_locktime);
}
}
putchar ('\n');
}
}
static int reset_one (uid_t uid)
{
off_t offset;
struct faillog faillog;
offset = uid * sizeof faillog;
if (fstat (fileno (fail), &statbuf)) {
perror (FAILLOG_FILE);
return 0;
}
if (offset >= statbuf.st_size)
return 0;
if (fseeko (fail, offset, SEEK_SET) != 0) {
perror (FAILLOG_FILE);
return 0;
}
if (fread ((char *) &faillog, sizeof faillog, 1, fail) != 1) {
if (!feof (fail))
perror (FAILLOG_FILE);
return 0;
}
if (faillog.fail_cnt == 0)
return 1; /* don't fill in no holes ... */
faillog.fail_cnt = 0;
if (fseeko (fail, offset, SEEK_SET) == 0
&& fwrite ((char *) &faillog, sizeof faillog, 1, fail) == 1) {
fflush (fail);
return 1;
} else {
perror (FAILLOG_FILE);
}
return 0;
}
static void reset (void)
{
uid_t uid;
if (uflg)
reset_one (user);
else
for (uid = 0; reset_one (uid); uid++);
}
static void print (void)
{
uid_t uid;
off_t offset;
struct faillog faillog;
if (uflg) {
offset = user * sizeof faillog;
if (fstat (fileno (fail), &statbuf)) {
perror (FAILLOG_FILE);
return;
}
if (offset >= statbuf.st_size)
return;
fseeko (fail, (off_t) user * sizeof faillog, SEEK_SET);
if (fread ((char *) &faillog, sizeof faillog, 1, fail) == 1)
print_one (&faillog, user);
else
perror (FAILLOG_FILE);
} else {
for (uid = 0;
fread ((char *) &faillog, sizeof faillog, 1,
fail) == 1; uid++) {
if (aflg == 0 && faillog.fail_cnt == 0)
continue;
if (aflg == 0 && tflg &&
NOW - faillog.fail_time > seconds)
continue;
if (aflg && faillog.fail_time == 0)
continue;
print_one (&faillog, uid);
}
}
}
static void setmax_one (uid_t uid, int max)
{
off_t offset;
struct faillog faillog;
offset = uid * sizeof faillog;
if (fseeko (fail, offset, SEEK_SET) != 0) {
perror (FAILLOG_FILE);
return;
}
if (fread ((char *) &faillog, sizeof faillog, 1, fail) != 1) {
if (!feof (fail))
perror (FAILLOG_FILE);
memzero (&faillog, sizeof faillog);
}
faillog.fail_max = max;
if (fseeko (fail, offset, SEEK_SET) == 0
&& fwrite ((char *) &faillog, sizeof faillog, 1, fail) == 1)
fflush (fail);
else
perror (FAILLOG_FILE);
}
static void setmax (int max)
{
struct passwd *pwent;
if (uflg) {
setmax_one (user, max);
} else {
setpwent ();
while ((pwent = getpwent ()))
setmax_one (pwent->pw_uid, max);
}
}
static void set_locktime_one (uid_t uid, long locktime)
{
off_t offset;
struct faillog faillog;
offset = uid * sizeof faillog;
if (fseeko (fail, offset, SEEK_SET) != 0) {
perror (FAILLOG_FILE);
return;
}
if (fread ((char *) &faillog, sizeof faillog, 1, fail) != 1) {
if (!feof (fail))
perror (FAILLOG_FILE);
memzero (&faillog, sizeof faillog);
}
faillog.fail_locktime = locktime;
if (fseeko (fail, offset, SEEK_SET) == 0
&& fwrite ((char *) &faillog, sizeof faillog, 1, fail) == 1)
fflush (fail);
else
perror (FAILLOG_FILE);
}
/*
* XXX - this needs to be written properly some day, right now it is
* a quick cut-and-paste hack from the above two functions. --marekm
*/
static void set_locktime (long locktime)
{
struct passwd *pwent;
if (uflg) {
set_locktime_one (user, locktime);
} else {
setpwent ();
while ((pwent = getpwent ()))
set_locktime_one (pwent->pw_uid, locktime);
}
}
int main (int argc, char **argv)
{
int anyflag = 0;
struct passwd *pwent;
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
/* try to open for read/write, if that fails - read only */
fail = fopen (FAILLOG_FILE, "r+");
if (!fail)
fail = fopen (FAILLOG_FILE, "r");
if (!fail) {
perror (FAILLOG_FILE);
exit (1);
}
{
int option_index = 0;
int c;
static struct option long_options[] = {
{"all", no_argument, NULL, 'a'},
{"help", no_argument, NULL, 'h'},
{"lock-secs", required_argument, NULL, 'l'},
{"maximum", required_argument, NULL, 'm'},
{"reset", no_argument, NULL, 'r'},
{"time", required_argument, NULL, 't'},
{"user", required_argument, NULL, 'u'},
{NULL, 0, NULL, '\0'}
};
while ((c =
getopt_long (argc, argv, "ahl:m:rt:u:",
long_options, &option_index)) != -1) {
switch (c) {
case 'a':
aflg++;
if (uflg)
usage ();
break;
case 'h':
usage ();
break;
case 'l':
set_locktime ((long) atoi (optarg));
anyflag++;
break;
case 'm':
setmax (atoi (optarg));
anyflag++;
break;
case 'r':
reset ();
anyflag++;
break;
case 't':
days = atoi (optarg);
seconds = days * DAY;
tflg++;
break;
case 'u':
if (aflg)
usage ();
pwent = getpwnam (optarg);
if (!pwent) {
fprintf (stderr,
_("Unknown User: %s\n"),
optarg);
exit (1);
}
uflg++;
user = pwent->pw_uid;
break;
default:
usage ();
}
}
}
/* no flags implies -a -p (= print information for all users) */
if (!(anyflag || aflg || tflg || uflg))
aflg++;
/* (-a or -t days or -u user) and no other flags implies -p
(= print information for selected users) */
if (!anyflag && (aflg || tflg || uflg))
print ();
fclose (fail);
exit (E_SUCCESS);
}