443 lines
11 KiB
C
443 lines
11 KiB
C
/*
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* SPDX-FileCopyrightText: 1989 - 1994, Julianne Frances Haugh
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* SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
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* SPDX-FileCopyrightText: 2000 - 2006, Tomasz Kłoczko
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* SPDX-FileCopyrightText: 2007 - 2011, Nicolas François
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <config.h>
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#ident "$Id$"
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#include <getopt.h>
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#include <lastlog.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <time.h>
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#include <assert.h>
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#ifdef HAVE_LL_HOST
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#include <net/if.h>
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#endif
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#include "defines.h"
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#include "prototypes.h"
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#include "getdef.h"
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/*@-exitarg@*/
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#include "exitcodes.h"
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#include "shadowlog.h"
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/*
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* Needed for MkLinux DR1/2/2.1 - J.
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*/
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#ifndef LASTLOG_FILE
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#define LASTLOG_FILE "/var/log/lastlog"
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#endif
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/*
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* Global variables
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*/
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const char *Prog; /* Program name */
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static FILE *lastlogfile; /* lastlog file stream */
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static unsigned long umin; /* if uflg and has_umin, only display users with uid >= umin */
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static bool has_umin = false;
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static unsigned long umax; /* if uflg and has_umax, only display users with uid <= umax */
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static bool has_umax = false;
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static time_t seconds; /* that number of days in seconds */
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static time_t inverse_seconds; /* that number of days in seconds */
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static struct stat statbuf; /* fstat buffer for file size */
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static bool uflg = false; /* print only an user of range of users */
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static bool tflg = false; /* print is restricted to most recent days */
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static bool bflg = false; /* print excludes most recent days */
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static bool Cflg = false; /* clear record for user */
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static bool Sflg = false; /* set record for user */
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#define NOW time(NULL)
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NORETURN
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static void
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usage (int status)
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{
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FILE *usageout = (E_SUCCESS != status) ? stderr : stdout;
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(void) fprintf (usageout,
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_("Usage: %s [options]\n"
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"\n"
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"Options:\n"),
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Prog);
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(void) fputs (_(" -b, --before DAYS print only lastlog records older than DAYS\n"), usageout);
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(void) fputs (_(" -C, --clear clear lastlog record of an user (usable only with -u)\n"), usageout);
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(void) fputs (_(" -h, --help display this help message and exit\n"), usageout);
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(void) fputs (_(" -R, --root CHROOT_DIR directory to chroot into\n"), usageout);
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(void) fputs (_(" -S, --set set lastlog record to current time (usable only with -u)\n"), usageout);
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(void) fputs (_(" -t, --time DAYS print only lastlog records more recent than DAYS\n"), usageout);
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(void) fputs (_(" -u, --user LOGIN print lastlog record of the specified LOGIN\n"), usageout);
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(void) fputs ("\n", usageout);
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exit (status);
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}
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static void print_one (/*@null@*/const struct passwd *pw)
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{
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static bool once = false;
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char *cp;
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struct tm *tm;
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time_t ll_time;
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off_t offset;
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struct lastlog ll;
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char ptime[80];
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#ifdef HAVE_LL_HOST
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/*
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* ll_host is in minimized form, thus the maximum IPv6 address possible is
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* 8*4+7 = 39 characters.
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* RFC 4291 2.5.6 states that for LL-addresses fe80+only the interface ID is set,
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* thus having a maximum size of 25+1+IFNAMSIZ.
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* POSIX says IFNAMSIZ should be 16 characters long including the null byte, thus
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* 25+1+IFNAMSIZ >= 42 > 39
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*/
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/* Link-Local address + % + Interfacename */
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const int maxIPv6Addrlen = 25+1+IFNAMSIZ;
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#endif
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if (NULL == pw) {
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return;
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}
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offset = (off_t) pw->pw_uid * sizeof (ll);
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if (offset + sizeof (ll) <= statbuf.st_size) {
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/* fseeko errors are not really relevant for us. */
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int err = fseeko (lastlogfile, offset, SEEK_SET);
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assert (0 == err);
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/* lastlog is a sparse file. Even if no entries were
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* entered for this user, which should be able to get the
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* empty entry in this case.
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*/
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if (fread (&ll, sizeof (ll), 1, lastlogfile) != 1) {
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fprintf (stderr,
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_("%s: Failed to get the entry for UID %lu\n"),
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Prog, (unsigned long int)pw->pw_uid);
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exit (EXIT_FAILURE);
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}
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} else {
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/* Outsize of the lastlog file.
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* Behave as if there were a missing entry (same behavior
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* as if we were reading an non existing entry in the
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* sparse lastlog file).
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*/
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memzero (&ll, sizeof (ll));
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}
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/* Filter out entries that do not match with the -t or -b options */
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if (tflg && ((NOW - ll.ll_time) > seconds)) {
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return;
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}
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if (bflg && ((NOW - ll.ll_time) < inverse_seconds)) {
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return;
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}
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/* Print the header only once */
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if (!once) {
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#ifdef HAVE_LL_HOST
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printf (_("Username Port From%*sLatest\n"), maxIPv6Addrlen-3, " ");
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#else
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puts (_("Username Port Latest"));
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#endif
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once = true;
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}
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ll_time = ll.ll_time;
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tm = localtime (&ll_time);
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if (tm == NULL) {
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cp = "(unknown)";
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} else {
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strftime (ptime, sizeof (ptime), "%a %b %e %H:%M:%S %z %Y", tm);
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cp = ptime;
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}
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if (ll.ll_time == (time_t) 0) {
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cp = _("**Never logged in**\0");
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}
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#ifdef HAVE_LL_HOST
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printf ("%-16s %-8.8s %*s%s\n",
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pw->pw_name, ll.ll_line, -maxIPv6Addrlen, ll.ll_host, cp);
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#else
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printf ("%-16s\t%-8.8s %s\n",
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pw->pw_name, ll.ll_line, cp);
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#endif
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}
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static void print (void)
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{
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const struct passwd *pwent;
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unsigned long lastlog_uid_max;
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lastlog_uid_max = getdef_ulong ("LASTLOG_UID_MAX", 0xFFFFFFFFUL);
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if ( (has_umin && umin > lastlog_uid_max)
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|| (has_umax && umax > lastlog_uid_max)) {
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fprintf (stderr, _("%s: Selected uid(s) are higher than LASTLOG_UID_MAX (%lu),\n"
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"\tthe output might be incorrect.\n"), Prog, lastlog_uid_max);
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}
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if (uflg && has_umin && has_umax && (umin == umax)) {
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print_one (getpwuid (umin));
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} else {
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setpwent ();
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while ( (pwent = getpwent ()) != NULL ) {
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if ( uflg
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&& ( (has_umin && (pwent->pw_uid < (uid_t)umin))
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|| (has_umax && (pwent->pw_uid > (uid_t)umax)))) {
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continue;
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} else if ( !uflg && pwent->pw_uid > (uid_t) lastlog_uid_max) {
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continue;
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}
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print_one (pwent);
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}
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endpwent ();
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}
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}
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static void update_one (/*@null@*/const struct passwd *pw)
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{
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off_t offset;
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struct lastlog ll;
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int err;
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if (NULL == pw) {
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return;
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}
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offset = (off_t) pw->pw_uid * sizeof (ll);
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/* fseeko errors are not really relevant for us. */
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err = fseeko (lastlogfile, offset, SEEK_SET);
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assert (0 == err);
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memzero (&ll, sizeof (ll));
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if (Sflg) {
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ll.ll_time = NOW;
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#ifdef HAVE_LL_HOST
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strcpy (ll.ll_host, "localhost");
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#endif
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strcpy (ll.ll_line, "lastlog");
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#ifdef WITH_AUDIT
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audit_logger (AUDIT_ACCT_UNLOCK, Prog,
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"clearing-lastlog",
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pw->pw_name, pw->pw_uid, SHADOW_AUDIT_SUCCESS);
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#endif
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}
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#ifdef WITH_AUDIT
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else {
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audit_logger (AUDIT_ACCT_UNLOCK, Prog,
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"refreshing-lastlog",
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pw->pw_name, pw->pw_uid, SHADOW_AUDIT_SUCCESS);
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}
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#endif
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if (fwrite (&ll, sizeof(ll), 1, lastlogfile) != 1) {
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fprintf (stderr,
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_("%s: Failed to update the entry for UID %lu\n"),
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Prog, (unsigned long int)pw->pw_uid);
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exit (EXIT_FAILURE);
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}
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}
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static void update (void)
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{
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const struct passwd *pwent;
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unsigned long lastlog_uid_max;
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if (!uflg) /* safety measure */
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return;
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lastlog_uid_max = getdef_ulong ("LASTLOG_UID_MAX", 0xFFFFFFFFUL);
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if ( (has_umin && umin > lastlog_uid_max)
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|| (has_umax && umax > lastlog_uid_max)) {
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fprintf (stderr, _("%s: Selected uid(s) are higher than LASTLOG_UID_MAX (%lu),\n"
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"\tthey will not be updated.\n"), Prog, lastlog_uid_max);
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return;
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}
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if (has_umin && has_umax && (umin == umax)) {
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update_one (getpwuid (umin));
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} else {
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setpwent ();
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while ( (pwent = getpwent ()) != NULL ) {
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if ((has_umin && (pwent->pw_uid < (uid_t)umin))
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|| (has_umax && (pwent->pw_uid > (uid_t)umax))) {
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continue;
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}
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update_one (pwent);
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}
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endpwent ();
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}
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if (fflush (lastlogfile) != 0 || fsync (fileno (lastlogfile)) != 0) {
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fprintf (stderr,
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_("%s: Failed to update the lastlog file\n"),
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Prog);
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exit (EXIT_FAILURE);
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}
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}
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int main (int argc, char **argv)
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{
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/*
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* Get the program name. The program name is used as a prefix to
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* most error messages.
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*/
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Prog = Basename (argv[0]);
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log_set_progname(Prog);
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log_set_logfd(stderr);
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(void) setlocale (LC_ALL, "");
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(void) bindtextdomain (PACKAGE, LOCALEDIR);
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(void) textdomain (PACKAGE);
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process_root_flag ("-R", argc, argv);
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#ifdef WITH_AUDIT
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audit_help_open ();
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#endif
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{
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int c;
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static struct option const longopts[] = {
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{"before", required_argument, NULL, 'b'},
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{"clear", no_argument, NULL, 'C'},
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{"help", no_argument, NULL, 'h'},
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{"root", required_argument, NULL, 'R'},
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{"set", no_argument, NULL, 'S'},
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{"time", required_argument, NULL, 't'},
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{"user", required_argument, NULL, 'u'},
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{NULL, 0, NULL, '\0'}
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};
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while ((c = getopt_long (argc, argv, "b:ChR:St:u:", longopts,
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NULL)) != -1) {
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switch (c) {
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case 'b':
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{
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unsigned long inverse_days;
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if (getulong (optarg, &inverse_days) == 0) {
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fprintf (stderr,
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_("%s: invalid numeric argument '%s'\n"),
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Prog, optarg);
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exit (EXIT_FAILURE);
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}
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inverse_seconds = (time_t) inverse_days * DAY;
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bflg = true;
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break;
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}
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case 'C':
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{
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Cflg = true;
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break;
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}
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case 'h':
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usage (EXIT_SUCCESS);
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/*@notreached@*/break;
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case 'R': /* no-op, handled in process_root_flag () */
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break;
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case 'S':
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{
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Sflg = true;
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break;
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}
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case 't':
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{
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unsigned long days;
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if (getulong (optarg, &days) == 0) {
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fprintf (stderr,
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_("%s: invalid numeric argument '%s'\n"),
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Prog, optarg);
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exit (EXIT_FAILURE);
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}
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seconds = (time_t) days * DAY;
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tflg = true;
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break;
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}
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case 'u':
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{
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const struct passwd *pwent;
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/*
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* The user can be:
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* - a login name
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* - numerical
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* - a numerical login ID
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* - a range (-x, x-, x-y)
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*/
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uflg = true;
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/* local, no need for xgetpwnam */
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pwent = getpwnam (optarg);
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if (NULL != pwent) {
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umin = pwent->pw_uid;
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has_umin = true;
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umax = umin;
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has_umax = true;
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} else {
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if (getrange (optarg,
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&umin, &has_umin,
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&umax, &has_umax) == 0) {
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fprintf (stderr,
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_("%s: Unknown user or range: %s\n"),
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Prog, optarg);
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exit (EXIT_FAILURE);
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}
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}
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break;
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}
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default:
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usage (EXIT_FAILURE);
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/*@notreached@*/break;
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}
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}
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if (argc > optind) {
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fprintf (stderr,
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_("%s: unexpected argument: %s\n"),
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Prog, argv[optind]);
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usage (EXIT_FAILURE);
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}
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if (Cflg && Sflg) {
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fprintf (stderr,
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_("%s: Option -C cannot be used together with option -S\n"),
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Prog);
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usage (EXIT_FAILURE);
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}
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if ((Cflg || Sflg) && !uflg) {
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fprintf (stderr,
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_("%s: Options -C and -S require option -u to specify the user\n"),
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Prog);
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usage (EXIT_FAILURE);
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}
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}
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lastlogfile = fopen (LASTLOG_FILE, (Cflg || Sflg)?"r+":"r");
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if (NULL == lastlogfile) {
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perror (LASTLOG_FILE);
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exit (EXIT_FAILURE);
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}
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/* Get the lastlog size */
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if (fstat (fileno (lastlogfile), &statbuf) != 0) {
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fprintf (stderr,
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_("%s: Cannot get the size of %s: %s\n"),
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Prog, LASTLOG_FILE, strerror (errno));
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exit (EXIT_FAILURE);
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}
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if (Cflg || Sflg)
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update ();
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else
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print ();
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(void) fclose (lastlogfile);
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return EXIT_SUCCESS;
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}
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