Adding upstream version 1:4.13+dfsg1.upstream/1%4.13+dfsg1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 440 insertions, 0 deletions

diff --git a/src/lastlog.c b/src/lastlog.c
new file mode 100644
index 0000000..f5c0a5c
--- /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;
+}
+