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-rw-r--r--src/faillog.c720
1 files changed, 720 insertions, 0 deletions
diff --git a/src/faillog.c b/src/faillog.c
new file mode 100644
index 0000000..0f94836
--- /dev/null
+++ b/src/faillog.c
@@ -0,0 +1,720 @@
+/*
+ * SPDX-FileCopyrightText: 1989 - 1993, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2002 - 2006, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2011, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#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 <assert.h>
+#include "defines.h"
+#include "faillog.h"
+#include "prototypes.h"
+/*@-exitarg@*/
+#include "exitcodes.h"
+#include "shadowlog.h"
+
+/* local function prototypes */
+static /*@noreturn@*/void usage (int status);
+static void print_one (/*@null@*/const struct passwd *pw, bool force);
+static void set_locktime (long locktime);
+static bool set_locktime_one (uid_t uid, long locktime);
+static void setmax (short max);
+static bool setmax_one (uid_t uid, short max);
+static void print (void);
+static bool reset_one (uid_t uid);
+static void reset (void);
+
+/*
+ * Global variables
+ */
+const char *Prog; /* Program name */
+static FILE *fail; /* failure file stream */
+static time_t seconds; /* that number of days in seconds */
+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 bool errors = false;
+
+static bool aflg = false; /* set if all users are to be printed always */
+static bool uflg = false; /* set if user is a valid user id */
+static bool tflg = false; /* print is restricted to most recent days */
+static bool lflg = false; /* set the locktime */
+static bool mflg = false; /* set maximum failed login counters */
+static bool rflg = false; /* reset the counters of login failures */
+
+static struct stat statbuf; /* fstat buffer for file size */
+
+#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 (_(" -a, --all display faillog records for all users\n"), usageout);
+ (void) fputs (_(" -h, --help display this help message and exit\n"), usageout);
+ (void) fputs (_(" -l, --lock-secs SEC after failed login lock account for SEC seconds\n"), usageout);
+ (void) fputs (_(" -m, --maximum MAX set maximum failed login counters to MAX\n"), usageout);
+ (void) fputs (_(" -r, --reset reset the counters of login failures\n"), usageout);
+ (void) fputs (_(" -R, --root CHROOT_DIR directory to chroot into\n"), usageout);
+ (void) fputs (_(" -t, --time DAYS display faillog records more recent than DAYS\n"), usageout);
+ (void) fputs (_(" -u, --user LOGIN/RANGE display faillog record or maintains failure\n"
+ " counters and limits (if used with -r, -m,\n"
+ " or -l) only for the specified LOGIN(s)\n"), usageout);
+ (void) fputs ("\n", usageout);
+ exit (status);
+}
+
+static void print_one (/*@null@*/const struct passwd *pw, bool force)
+{
+ static bool once = false;
+ struct tm *tm;
+ off_t offset;
+ struct faillog fl;
+ time_t now;
+ char *cp;
+ char ptime[80];
+
+ if (NULL == pw) {
+ return;
+ }
+
+ offset = (off_t) pw->pw_uid * sizeof (fl);
+ if (offset + sizeof (fl) <= statbuf.st_size) {
+ /* fseeko errors are not really relevant for us. */
+ int err = fseeko (fail, offset, SEEK_SET);
+ assert (0 == err);
+ /* faillog 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 *) &fl, sizeof (fl), 1, fail) != 1) {
+ fprintf (stderr,
+ _("%s: Failed to get the entry for UID %lu\n"),
+ Prog, (unsigned long int)pw->pw_uid);
+ return;
+ }
+ } else {
+ /* Outsize of the faillog file.
+ * Behave as if there were a missing entry (same behavior
+ * as if we were reading an non existing entry in the
+ * sparse faillog file).
+ */
+ memzero (&fl, sizeof (fl));
+ }
+
+ /* Nothing to report */
+ if (!force && (0 == fl.fail_time)) {
+ return;
+ }
+
+ (void) time(&now);
+
+ /* Filter out entries that do not match with the -t option */
+ if (tflg && ((now - fl.fail_time) > seconds)) {
+ return;
+ }
+
+ /* Print the header only once */
+ if (!once) {
+ puts (_("Login Failures Maximum Latest On\n"));
+ once = true;
+ }
+
+ tm = localtime (&fl.fail_time);
+ if (!tm) {
+ fprintf (stderr, "Cannot read time from faillog.\n");
+ return;
+ }
+ strftime (ptime, sizeof (ptime), "%D %H:%M:%S %z", tm);
+ cp = ptime;
+
+ printf ("%-9s %5d %5d ",
+ pw->pw_name, fl.fail_cnt, fl.fail_max);
+ printf ("%s %s", cp, fl.fail_line);
+ if (0 != fl.fail_locktime) {
+ if ( ((fl.fail_time + fl.fail_locktime) > now)
+ && (0 != fl.fail_cnt)) {
+ printf (_(" [%lus left]"),
+ (unsigned long) fl.fail_time + fl.fail_locktime - now);
+ } else {
+ printf (_(" [%lds lock]"),
+ fl.fail_locktime);
+ }
+ }
+ putchar ('\n');
+}
+
+static void print (void)
+{
+ if (uflg && has_umin && has_umax && (umin==umax)) {
+ print_one (getpwuid ((uid_t)umin), true);
+ } else {
+ /* We only print records for existing users.
+ * Loop based on the user database instead of reading the
+ * whole file. We will have to query the database anyway
+ * so except for very small ranges and large user
+ * database, this should not be a performance issue.
+ */
+ struct passwd *pwent;
+
+ setpwent ();
+ while ( (pwent = getpwent ()) != NULL ) {
+ if ( uflg
+ && ( (has_umin && (pwent->pw_uid < (uid_t)umin))
+ || (has_umax && (pwent->pw_uid > (uid_t)umax)))) {
+ continue;
+ }
+ print_one (pwent, aflg);
+ }
+ endpwent ();
+ }
+}
+
+/*
+ * reset_one - Reset the fail count for one user
+ *
+ * This returns a boolean indicating if an error occurred.
+ */
+static bool reset_one (uid_t uid)
+{
+ off_t offset;
+ struct faillog fl;
+
+ offset = (off_t) uid * sizeof (fl);
+ if (offset + sizeof (fl) <= statbuf.st_size) {
+ /* fseeko errors are not really relevant for us. */
+ int err = fseeko (fail, offset, SEEK_SET);
+ assert (0 == err);
+ /* faillog 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 *) &fl, sizeof (fl), 1, fail) != 1) {
+ fprintf (stderr,
+ _("%s: Failed to get the entry for UID %lu\n"),
+ Prog, (unsigned long int)uid);
+ return true;
+ }
+ } else {
+ /* Outsize of the faillog file.
+ * Behave as if there were a missing entry (same behavior
+ * as if we were reading an non existing entry in the
+ * sparse faillog file).
+ */
+ memzero (&fl, sizeof (fl));
+ }
+
+ if (0 == fl.fail_cnt) {
+ /* If the count is already null, do not write in the file.
+ * This avoids writing 0 when no entries were present for
+ * the user.
+ */
+ return false;
+ }
+
+ fl.fail_cnt = 0;
+
+ if ( (fseeko (fail, offset, SEEK_SET) == 0)
+ && (fwrite ((char *) &fl, sizeof (fl), 1, fail) == 1)) {
+ (void) fflush (fail);
+ return false;
+ }
+
+ fprintf (stderr,
+ _("%s: Failed to reset fail count for UID %lu\n"),
+ Prog, (unsigned long int)uid);
+ return true;
+}
+
+static void reset (void)
+{
+ if (uflg && has_umin && has_umax && (umin==umax)) {
+ if (reset_one ((uid_t)umin)) {
+ errors = true;
+ }
+ } else {
+ /* There is no need to reset outside of the faillog
+ * database.
+ */
+ uid_t uidmax = statbuf.st_size / sizeof (struct faillog);
+ if (uidmax > 1) {
+ uidmax--;
+ }
+ if (has_umax && (uid_t)umax < uidmax) {
+ uidmax = (uid_t)umax;
+ }
+
+ /* Reset all entries in the specified range.
+ * Non existing entries will not be touched.
+ */
+ if (aflg) {
+ /* Entries for non existing users are also reset.
+ */
+ uid_t uid = 0;
+
+ /* Make sure we stay in the umin-umax range if specified */
+ if (has_umin) {
+ uid = (uid_t)umin;
+ }
+
+ while (uid <= uidmax) {
+ if (reset_one (uid)) {
+ errors = true;
+ }
+ uid++;
+ }
+ } else {
+ /* Only reset records for existing users.
+ */
+ struct passwd *pwent;
+
+ setpwent ();
+ while ( (pwent = getpwent ()) != NULL ) {
+ if ( uflg
+ && ( (has_umin && (pwent->pw_uid < (uid_t)umin))
+ || (pwent->pw_uid > (uid_t)uidmax))) {
+ continue;
+ }
+ if (reset_one (pwent->pw_uid)) {
+ errors = true;
+ }
+ }
+ endpwent ();
+ }
+ }
+}
+
+/*
+ * setmax_one - Set the maximum failed login counter for one user
+ *
+ * This returns a boolean indicating if an error occurred.
+ */
+static bool setmax_one (uid_t uid, short max)
+{
+ off_t offset;
+ struct faillog fl;
+
+ offset = (off_t) uid * sizeof (fl);
+ if (offset + sizeof (fl) <= statbuf.st_size) {
+ /* fseeko errors are not really relevant for us. */
+ int err = fseeko (fail, offset, SEEK_SET);
+ assert (0 == err);
+ /* faillog 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 *) &fl, sizeof (fl), 1, fail) != 1) {
+ fprintf (stderr,
+ _("%s: Failed to get the entry for UID %lu\n"),
+ Prog, (unsigned long int)uid);
+ return true;
+ }
+ } else {
+ /* Outsize of the faillog file.
+ * Behave as if there were a missing entry (same behavior
+ * as if we were reading an non existing entry in the
+ * sparse faillog file).
+ */
+ memzero (&fl, sizeof (fl));
+ }
+
+ if (max == fl.fail_max) {
+ /* If the max is already set to the right value, do not
+ * write in the file.
+ * This avoids writing 0 when no entries were present for
+ * the user and the max argument is 0.
+ */
+ return false;
+ }
+
+ fl.fail_max = max;
+
+ if ( (fseeko (fail, offset, SEEK_SET) == 0)
+ && (fwrite ((char *) &fl, sizeof (fl), 1, fail) == 1)) {
+ (void) fflush (fail);
+ return false;
+ }
+
+ fprintf (stderr,
+ _("%s: Failed to set max for UID %lu\n"),
+ Prog, (unsigned long int)uid);
+ return true;
+}
+
+static void setmax (short max)
+{
+ if (uflg && has_umin && has_umax && (umin==umax)) {
+ if (setmax_one ((uid_t)umin, max)) {
+ errors = true;
+ }
+ } else {
+ /* Set max for entries in the specified range.
+ * If max is unchanged for an entry, the entry is not touched.
+ * If max is null, and no entries exist for this user, no
+ * entries will be created.
+ */
+ if (aflg) {
+ /* Entries for non existing user are also taken into
+ * account (in order to define policy for future users).
+ */
+ uid_t uid = 0;
+ /* The default umax value is based on the size of the
+ * faillog database.
+ */
+ uid_t uidmax = statbuf.st_size / sizeof (struct faillog);
+ if (uidmax > 1) {
+ uidmax--;
+ }
+
+ /* Make sure we stay in the umin-umax range if specified */
+ if (has_umin) {
+ uid = (uid_t)umin;
+ }
+ if (has_umax) {
+ uidmax = (uid_t)umax;
+ }
+
+ while (uid <= uidmax) {
+ if (setmax_one (uid, max)) {
+ errors = true;
+ }
+ uid++;
+ }
+ } else {
+ /* Only change records for existing users.
+ */
+ struct passwd *pwent;
+
+ setpwent ();
+ while ( (pwent = getpwent ()) != NULL ) {
+ if ( uflg
+ && ( (has_umin && (pwent->pw_uid < (uid_t)umin))
+ || (has_umax && (pwent->pw_uid > (uid_t)umax)))) {
+ continue;
+ }
+ if (setmax_one (pwent->pw_uid, max)) {
+ errors = true;
+ }
+ }
+ endpwent ();
+ }
+ }
+}
+
+/*
+ * set_locktime_one - Set the locktime for one user
+ *
+ * This returns a boolean indicating if an error occurred.
+ */
+static bool set_locktime_one (uid_t uid, long locktime)
+{
+ off_t offset;
+ struct faillog fl;
+
+ offset = (off_t) uid * sizeof (fl);
+ if (offset + sizeof (fl) <= statbuf.st_size) {
+ /* fseeko errors are not really relevant for us. */
+ int err = fseeko (fail, offset, SEEK_SET);
+ assert (0 == err);
+ /* faillog 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 *) &fl, sizeof (fl), 1, fail) != 1) {
+ fprintf (stderr,
+ _("%s: Failed to get the entry for UID %lu\n"),
+ Prog, (unsigned long int)uid);
+ return true;
+ }
+ } else {
+ /* Outsize of the faillog file.
+ * Behave as if there were a missing entry (same behavior
+ * as if we were reading an non existing entry in the
+ * sparse faillog file).
+ */
+ memzero (&fl, sizeof (fl));
+ }
+
+ if (locktime == fl.fail_locktime) {
+ /* If the locktime is already set to the right value, do not
+ * write in the file.
+ * This avoids writing 0 when no entries were present for
+ * the user and the locktime argument is 0.
+ */
+ return false;
+ }
+
+ fl.fail_locktime = locktime;
+
+ if ( (fseeko (fail, offset, SEEK_SET) == 0)
+ && (fwrite ((char *) &fl, sizeof (fl), 1, fail) == 1)) {
+ (void) fflush (fail);
+ return false;
+ }
+
+ fprintf (stderr,
+ _("%s: Failed to set locktime for UID %lu\n"),
+ Prog, (unsigned long int)uid);
+ return true;
+}
+
+static void set_locktime (long locktime)
+{
+ if (uflg && has_umin && has_umax && (umin==umax)) {
+ if (set_locktime_one ((uid_t)umin, locktime)) {
+ errors = true;
+ }
+ } else {
+ /* Set locktime for entries in the specified range.
+ * If locktime is unchanged for an entry, the entry is not touched.
+ * If locktime is null, and no entries exist for this user, no
+ * entries will be created.
+ */
+ if (aflg) {
+ /* Entries for non existing user are also taken into
+ * account (in order to define policy for future users).
+ */
+ uid_t uid = 0;
+ /* The default umax value is based on the size of the
+ * faillog database.
+ */
+ uid_t uidmax = statbuf.st_size / sizeof (struct faillog);
+ if (uidmax > 1) {
+ uidmax--;
+ }
+
+ /* Make sure we stay in the umin-umax range if specified */
+ if (has_umin) {
+ uid = (uid_t)umin;
+ }
+ if (has_umax) {
+ uidmax = (uid_t)umax;
+ }
+
+ while (uid <= uidmax) {
+ if (set_locktime_one (uid, locktime)) {
+ errors = true;
+ }
+ uid++;
+ }
+ } else {
+ /* Only change records for existing users.
+ */
+ struct passwd *pwent;
+
+ setpwent ();
+ while ( (pwent = getpwent ()) != NULL ) {
+ if ( uflg
+ && ( (has_umin && (pwent->pw_uid < (uid_t)umin))
+ || (has_umax && (pwent->pw_uid > (uid_t)umax)))) {
+ continue;
+ }
+ if (set_locktime_one (pwent->pw_uid, locktime)) {
+ errors = true;
+ }
+ }
+ endpwent ();
+ }
+ }
+}
+
+int main (int argc, char **argv)
+{
+ long fail_locktime = 0;
+ short fail_max = 0; // initialize to silence compiler warning
+ long days = 0;
+
+ /*
+ * 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);
+
+ {
+ 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'},
+ {"root", required_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:rR:t:u:",
+ long_options, NULL)) != -1) {
+ switch (c) {
+ case 'a':
+ aflg = true;
+ break;
+ case 'h':
+ usage (E_SUCCESS);
+ /*@notreached@*/break;
+ case 'l':
+ if (getlong (optarg, &fail_locktime) == 0) {
+ fprintf (stderr,
+ _("%s: invalid numeric argument '%s'\n"),
+ Prog, optarg);
+ exit (E_BAD_ARG);
+ }
+ lflg = true;
+ break;
+ case 'm':
+ {
+ long int lmax;
+ if ( (getlong (optarg, &lmax) == 0)
+ || ((long int)(short) lmax != lmax)) {
+ fprintf (stderr,
+ _("%s: invalid numeric argument '%s'\n"),
+ Prog, optarg);
+ exit (E_BAD_ARG);
+ }
+ fail_max = (short) lmax;
+ mflg = true;
+ break;
+ }
+ case 'r':
+ rflg = true;
+ break;
+ case 'R': /* no-op, handled in process_root_flag () */
+ break;
+ case 't':
+ if (getlong (optarg, &days) == 0) {
+ fprintf (stderr,
+ _("%s: invalid numeric argument '%s'\n"),
+ Prog, optarg);
+ exit (E_BAD_ARG);
+ }
+ seconds = (time_t) days * DAY;
+ tflg = true;
+ break;
+ case 'u':
+ {
+ /*
+ * The user can be:
+ * - a login name
+ * - numerical
+ * - a numerical login ID
+ * - a range (-x, x-, x-y)
+ */
+ struct passwd *pwent;
+
+ 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 (E_BAD_ARG);
+ }
+ }
+
+ break;
+ }
+ default:
+ usage (E_USAGE);
+ }
+ }
+ if (argc > optind) {
+ fprintf (stderr,
+ _("%s: unexpected argument: %s\n"),
+ Prog, argv[optind]);
+ usage (EXIT_FAILURE);
+ }
+ }
+
+ if (tflg && (lflg || mflg || rflg)) {
+ usage (E_USAGE);
+ }
+
+ /* Open the faillog database */
+ if (lflg || mflg || rflg) {
+ fail = fopen (FAILLOG_FILE, "r+");
+ } else {
+ fail = fopen (FAILLOG_FILE, "r");
+ }
+ if (NULL == fail) {
+ fprintf (stderr,
+ _("%s: Cannot open %s: %s\n"),
+ Prog, FAILLOG_FILE, strerror (errno));
+ exit (E_NOPERM);
+ }
+
+ /* Get the size of the faillog */
+ if (fstat (fileno (fail), &statbuf) != 0) {
+ fprintf (stderr,
+ _("%s: Cannot get the size of %s: %s\n"),
+ Prog, FAILLOG_FILE, strerror (errno));
+ exit (E_NOPERM);
+ }
+
+ if (lflg) {
+ set_locktime (fail_locktime);
+ }
+
+ if (mflg) {
+ setmax (fail_max);
+ }
+
+ if (rflg) {
+ reset ();
+ }
+
+ if (!(lflg || mflg || rflg)) {
+ print ();
+ }
+
+ if (lflg || mflg || rflg) {
+ if ( (ferror (fail) != 0)
+ || (fflush (fail) != 0)
+ || (fsync (fileno (fail)) != 0)
+ || (fclose (fail) != 0)) {
+ fprintf (stderr,
+ _("%s: Failed to write %s: %s\n"),
+ Prog, FAILLOG_FILE, strerror (errno));
+ (void) fclose (fail);
+ errors = true;
+ }
+ } else {
+ (void) fclose (fail);
+ }
+
+ exit (errors ? E_NOPERM : E_SUCCESS);
+}
+
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