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-rw-r--r--src/lastlog.c440
1 files changed, 440 insertions, 0 deletions
diff --git a/src/lastlog.c b/src/lastlog.c
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--- /dev/null
+++ b/src/lastlog.c
@@ -0,0 +1,440 @@
+/*
+ * SPDX-FileCopyrightText: 1989 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2000 - 2006, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2011, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <getopt.h>
+#include <lastlog.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <time.h>
+#include <assert.h>
+#ifdef HAVE_LL_HOST
+#include <net/if.h>
+#endif
+#include "defines.h"
+#include "prototypes.h"
+#include "getdef.h"
+/*@-exitarg@*/
+#include "exitcodes.h"
+#include "shadowlog.h"
+
+/*
+ * Needed for MkLinux DR1/2/2.1 - J.
+ */
+#ifndef LASTLOG_FILE
+#define LASTLOG_FILE "/var/log/lastlog"
+#endif
+
+/*
+ * Global variables
+ */
+const char *Prog; /* Program name */
+static FILE *lastlogfile; /* lastlog file stream */
+static unsigned long umin; /* if uflg and has_umin, only display users with uid >= umin */
+static bool has_umin = false;
+static unsigned long umax; /* if uflg and has_umax, only display users with uid <= umax */
+static bool has_umax = false;
+static time_t seconds; /* that number of days in seconds */
+static time_t inverse_seconds; /* that number of days in seconds */
+static struct stat statbuf; /* fstat buffer for file size */
+
+
+static bool uflg = false; /* print only an user of range of users */
+static bool tflg = false; /* print is restricted to most recent days */
+static bool bflg = false; /* print excludes most recent days */
+static bool Cflg = false; /* clear record for user */
+static bool Sflg = false; /* set record for user */
+
+#define NOW (time ((time_t *) 0))
+
+static /*@noreturn@*/void usage (int status)
+{
+ FILE *usageout = (E_SUCCESS != status) ? stderr : stdout;
+ (void) fprintf (usageout,
+ _("Usage: %s [options]\n"
+ "\n"
+ "Options:\n"),
+ Prog);
+ (void) fputs (_(" -b, --before DAYS print only lastlog records older than DAYS\n"), usageout);
+ (void) fputs (_(" -C, --clear clear lastlog record of an user (usable only with -u)\n"), usageout);
+ (void) fputs (_(" -h, --help display this help message and exit\n"), usageout);
+ (void) fputs (_(" -R, --root CHROOT_DIR directory to chroot into\n"), usageout);
+ (void) fputs (_(" -S, --set set lastlog record to current time (usable only with -u)\n"), usageout);
+ (void) fputs (_(" -t, --time DAYS print only lastlog records more recent than DAYS\n"), usageout);
+ (void) fputs (_(" -u, --user LOGIN print lastlog record of the specified LOGIN\n"), usageout);
+ (void) fputs ("\n", usageout);
+ exit (status);
+}
+
+static void print_one (/*@null@*/const struct passwd *pw)
+{
+ static bool once = false;
+ char *cp;
+ struct tm *tm;
+ time_t ll_time;
+ off_t offset;
+ struct lastlog ll;
+ char ptime[80];
+
+#ifdef HAVE_LL_HOST
+ /*
+ * ll_host is in minimized form, thus the maximum IPv6 address possible is
+ * 8*4+7 = 39 characters.
+ * RFC 4291 2.5.6 states that for LL-addresses fe80+only the interface ID is set,
+ * thus having a maximum size of 25+1+IFNAMSIZ.
+ * POSIX says IFNAMSIZ should be 16 characters long including the null byte, thus
+ * 25+1+IFNAMSIZ >= 42 > 39
+ */
+ /* Link-Local address + % + Interfacename */
+ const int maxIPv6Addrlen = 25+1+IFNAMSIZ;
+#endif
+
+ if (NULL == pw) {
+ return;
+ }
+
+
+ offset = (off_t) pw->pw_uid * sizeof (ll);
+ if (offset + sizeof (ll) <= statbuf.st_size) {
+ /* fseeko errors are not really relevant for us. */
+ int err = fseeko (lastlogfile, offset, SEEK_SET);
+ assert (0 == err);
+ /* lastlog is a sparse file. Even if no entries were
+ * entered for this user, which should be able to get the
+ * empty entry in this case.
+ */
+ if (fread ((char *) &ll, sizeof (ll), 1, lastlogfile) != 1) {
+ fprintf (stderr,
+ _("%s: Failed to get the entry for UID %lu\n"),
+ Prog, (unsigned long int)pw->pw_uid);
+ exit (EXIT_FAILURE);
+ }
+ } else {
+ /* Outsize of the lastlog file.
+ * Behave as if there were a missing entry (same behavior
+ * as if we were reading an non existing entry in the
+ * sparse lastlog file).
+ */
+ memzero (&ll, sizeof (ll));
+ }
+
+ /* Filter out entries that do not match with the -t or -b options */
+ if (tflg && ((NOW - ll.ll_time) > seconds)) {
+ return;
+ }
+
+ if (bflg && ((NOW - ll.ll_time) < inverse_seconds)) {
+ return;
+ }
+
+ /* Print the header only once */
+ if (!once) {
+#ifdef HAVE_LL_HOST
+ printf (_("Username Port From%*sLatest\n"), maxIPv6Addrlen-3, " ");
+#else
+ puts (_("Username Port Latest"));
+#endif
+ once = true;
+ }
+
+ ll_time = ll.ll_time;
+ tm = localtime (&ll_time);
+ if (tm == NULL) {
+ cp = "(unknown)";
+ } else {
+ strftime (ptime, sizeof (ptime), "%a %b %e %H:%M:%S %z %Y", tm);
+ cp = ptime;
+ }
+ if (ll.ll_time == (time_t) 0) {
+ cp = _("**Never logged in**\0");
+ }
+
+#ifdef HAVE_LL_HOST
+ printf ("%-16s %-8.8s %*s%s\n",
+ pw->pw_name, ll.ll_line, -maxIPv6Addrlen, ll.ll_host, cp);
+#else
+ printf ("%-16s\t%-8.8s %s\n",
+ pw->pw_name, ll.ll_line, cp);
+#endif
+}
+
+static void print (void)
+{
+ const struct passwd *pwent;
+ unsigned long lastlog_uid_max;
+
+ lastlog_uid_max = getdef_ulong ("LASTLOG_UID_MAX", 0xFFFFFFFFUL);
+ if ( (has_umin && umin > lastlog_uid_max)
+ || (has_umax && umax > lastlog_uid_max)) {
+ fprintf (stderr, _("%s: Selected uid(s) are higher than LASTLOG_UID_MAX (%lu),\n"
+ "\tthe output might be incorrect.\n"), Prog, lastlog_uid_max);
+ }
+
+ if (uflg && has_umin && has_umax && (umin == umax)) {
+ print_one (getpwuid ((uid_t)umin));
+ } else {
+ setpwent ();
+ while ( (pwent = getpwent ()) != NULL ) {
+ if ( uflg
+ && ( (has_umin && (pwent->pw_uid < (uid_t)umin))
+ || (has_umax && (pwent->pw_uid > (uid_t)umax)))) {
+ continue;
+ } else if ( !uflg && pwent->pw_uid > (uid_t) lastlog_uid_max) {
+ continue;
+ }
+ print_one (pwent);
+ }
+ endpwent ();
+ }
+}
+
+static void update_one (/*@null@*/const struct passwd *pw)
+{
+ off_t offset;
+ struct lastlog ll;
+ int err;
+
+ if (NULL == pw) {
+ return;
+ }
+
+ offset = (off_t) pw->pw_uid * sizeof (ll);
+ /* fseeko errors are not really relevant for us. */
+ err = fseeko (lastlogfile, offset, SEEK_SET);
+ assert (0 == err);
+
+ memzero (&ll, sizeof (ll));
+
+ if (Sflg) {
+ ll.ll_time = NOW;
+#ifdef HAVE_LL_HOST
+ strcpy (ll.ll_host, "localhost");
+#endif
+ strcpy (ll.ll_line, "lastlog");
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_ACCT_UNLOCK, Prog,
+ "clearing-lastlog",
+ pw->pw_name, (unsigned int) pw->pw_uid, SHADOW_AUDIT_SUCCESS);
+#endif
+ }
+#ifdef WITH_AUDIT
+ else {
+ audit_logger (AUDIT_ACCT_UNLOCK, Prog,
+ "refreshing-lastlog",
+ pw->pw_name, (unsigned int) pw->pw_uid, SHADOW_AUDIT_SUCCESS);
+ }
+#endif
+
+ if (fwrite (&ll, sizeof(ll), 1, lastlogfile) != 1) {
+ fprintf (stderr,
+ _("%s: Failed to update the entry for UID %lu\n"),
+ Prog, (unsigned long int)pw->pw_uid);
+ exit (EXIT_FAILURE);
+ }
+}
+
+static void update (void)
+{
+ const struct passwd *pwent;
+ unsigned long lastlog_uid_max;
+
+ if (!uflg) /* safety measure */
+ return;
+
+ lastlog_uid_max = getdef_ulong ("LASTLOG_UID_MAX", 0xFFFFFFFFUL);
+ if ( (has_umin && umin > lastlog_uid_max)
+ || (has_umax && umax > lastlog_uid_max)) {
+ fprintf (stderr, _("%s: Selected uid(s) are higher than LASTLOG_UID_MAX (%lu),\n"
+ "\tthey will not be updated.\n"), Prog, lastlog_uid_max);
+ return;
+ }
+
+ if (has_umin && has_umax && (umin == umax)) {
+ update_one (getpwuid ((uid_t)umin));
+ } else {
+ setpwent ();
+ while ( (pwent = getpwent ()) != NULL ) {
+ if ((has_umin && (pwent->pw_uid < (uid_t)umin))
+ || (has_umax && (pwent->pw_uid > (uid_t)umax))) {
+ continue;
+ }
+ update_one (pwent);
+ }
+ endpwent ();
+ }
+
+ if (fflush (lastlogfile) != 0 || fsync (fileno (lastlogfile)) != 0) {
+ fprintf (stderr,
+ _("%s: Failed to update the lastlog file\n"),
+ Prog);
+ exit (EXIT_FAILURE);
+ }
+}
+
+int main (int argc, char **argv)
+{
+ /*
+ * Get the program name. The program name is used as a prefix to
+ * most error messages.
+ */
+ Prog = Basename (argv[0]);
+ log_set_progname(Prog);
+ log_set_logfd(stderr);
+
+ (void) setlocale (LC_ALL, "");
+ (void) bindtextdomain (PACKAGE, LOCALEDIR);
+ (void) textdomain (PACKAGE);
+
+ process_root_flag ("-R", argc, argv);
+
+#ifdef WITH_AUDIT
+ audit_help_open ();
+#endif
+
+ {
+ int c;
+ static struct option const longopts[] = {
+ {"before", required_argument, NULL, 'b'},
+ {"clear", no_argument, NULL, 'C'},
+ {"help", no_argument, NULL, 'h'},
+ {"root", required_argument, NULL, 'R'},
+ {"set", no_argument, NULL, 'S'},
+ {"time", required_argument, NULL, 't'},
+ {"user", required_argument, NULL, 'u'},
+ {NULL, 0, NULL, '\0'}
+ };
+
+ while ((c = getopt_long (argc, argv, "b:ChR:St:u:", longopts,
+ NULL)) != -1) {
+ switch (c) {
+ case 'b':
+ {
+ unsigned long inverse_days;
+ if (getulong (optarg, &inverse_days) == 0) {
+ fprintf (stderr,
+ _("%s: invalid numeric argument '%s'\n"),
+ Prog, optarg);
+ exit (EXIT_FAILURE);
+ }
+ inverse_seconds = (time_t) inverse_days * DAY;
+ bflg = true;
+ break;
+ }
+ case 'C':
+ {
+ Cflg = true;
+ break;
+ }
+ case 'h':
+ usage (EXIT_SUCCESS);
+ /*@notreached@*/break;
+ case 'R': /* no-op, handled in process_root_flag () */
+ break;
+ case 'S':
+ {
+ Sflg = true;
+ break;
+ }
+ case 't':
+ {
+ unsigned long days;
+ if (getulong (optarg, &days) == 0) {
+ fprintf (stderr,
+ _("%s: invalid numeric argument '%s'\n"),
+ Prog, optarg);
+ exit (EXIT_FAILURE);
+ }
+ seconds = (time_t) days * DAY;
+ tflg = true;
+ break;
+ }
+ case 'u':
+ {
+ const struct passwd *pwent;
+ /*
+ * The user can be:
+ * - a login name
+ * - numerical
+ * - a numerical login ID
+ * - a range (-x, x-, x-y)
+ */
+ uflg = true;
+ /* local, no need for xgetpwnam */
+ pwent = getpwnam (optarg);
+ if (NULL != pwent) {
+ umin = (unsigned long) pwent->pw_uid;
+ has_umin = true;
+ umax = umin;
+ has_umax = true;
+ } else {
+ if (getrange (optarg,
+ &umin, &has_umin,
+ &umax, &has_umax) == 0) {
+ fprintf (stderr,
+ _("%s: Unknown user or range: %s\n"),
+ Prog, optarg);
+ exit (EXIT_FAILURE);
+ }
+ }
+ break;
+ }
+ default:
+ usage (EXIT_FAILURE);
+ /*@notreached@*/break;
+ }
+ }
+ if (argc > optind) {
+ fprintf (stderr,
+ _("%s: unexpected argument: %s\n"),
+ Prog, argv[optind]);
+ usage (EXIT_FAILURE);
+ }
+ if (Cflg && Sflg) {
+ fprintf (stderr,
+ _("%s: Option -C cannot be used together with option -S\n"),
+ Prog);
+ usage (EXIT_FAILURE);
+ }
+ if ((Cflg || Sflg) && !uflg) {
+ fprintf (stderr,
+ _("%s: Options -C and -S require option -u to specify the user\n"),
+ Prog);
+ usage (EXIT_FAILURE);
+ }
+ }
+
+ lastlogfile = fopen (LASTLOG_FILE, (Cflg || Sflg)?"r+":"r");
+ if (NULL == lastlogfile) {
+ perror (LASTLOG_FILE);
+ exit (EXIT_FAILURE);
+ }
+
+ /* Get the lastlog size */
+ if (fstat (fileno (lastlogfile), &statbuf) != 0) {
+ fprintf (stderr,
+ _("%s: Cannot get the size of %s: %s\n"),
+ Prog, LASTLOG_FILE, strerror (errno));
+ exit (EXIT_FAILURE);
+ }
+
+ if (Cflg || Sflg)
+ update ();
+ else
+ print ();
+
+ (void) fclose (lastlogfile);
+
+ return EXIT_SUCCESS;
+}
+
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