Convert pam_lastlog(8) to libulog.

The information used by the "Last login:"-line is obtained by using
ulog_setutxfile(3) to switch to the lastlog database. Login and logout
are performed using the utility functions ulog_login(3) and
ulog_logout(3).

This also means we must build libulog during bootstrap.

Approved by:	des

2 files changed, 22 insertions, 84 deletions

diff --git a/lib/libpam/modules/pam_lastlog/Makefile b/lib/libpam/modules/pam_lastlog/Makefile
index f0b96c4..616c113 100644
--- a/lib/libpam/modules/pam_lastlog/Makefile
+++ b/lib/libpam/modules/pam_lastlog/Makefile
@@ -28,7 +28,7 @@ LIB=	pam_lastlog
 SRCS=	pam_lastlog.c
 MAN=	pam_lastlog.8
 
-DPADD=	${LIBUTIL}
-LDADD=	-lutil
+DPADD=	${LIBULOG}
+LDADD=	-lulog
 
 .include <bsd.lib.mk>
diff --git a/lib/libpam/modules/pam_lastlog/pam_lastlog.c b/lib/libpam/modules/pam_lastlog/pam_lastlog.c
index 9899f8d..a51432b 100644
--- a/lib/libpam/modules/pam_lastlog/pam_lastlog.c
+++ b/lib/libpam/modules/pam_lastlog/pam_lastlog.c
@@ -46,19 +46,9 @@ __FBSDID("$FreeBSD$");
 
 #define _BSD_SOURCE
 
-#include <sys/param.h>
-
-#include <fcntl.h>
-#include <libutil.h>
-#include <paths.h>
 #include <pwd.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <syslog.h>
 #include <time.h>
-#include <unistd.h>
-#include <utmp.h>
+#include <ulog.h>
 
 #define PAM_SM_SESSION
 
@@ -71,13 +61,11 @@ pam_sm_open_session(pam_handle_t *pamh, int flags,
     int argc __unused, const char *argv[] __unused)
 {
 	struct passwd *pwd;
-	struct utmp utmp;
-	struct lastlog ll;
+	struct ulog_utmpx *utx;
 	time_t t;
 	const char *user;
 	const void *rhost, *tty;
-	off_t llpos;
-	int fd, pam_err;
+	int pam_err;
 
 	pam_err = pam_get_user(pamh, &user, NULL);
 	if (pam_err != PAM_SUCCESS)
@@ -101,72 +89,29 @@ pam_sm_open_session(pam_handle_t *pamh, int flags,
 		pam_err = PAM_SERVICE_ERR;
 		goto err;
 	}
-	if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0)
-		tty = (const char *)tty + strlen(_PATH_DEV);
-	if (*(const char *)tty == '\0')
-		return (PAM_SERVICE_ERR);
-
-	fd = open(_PATH_LASTLOG, O_RDWR|O_CREAT, 0644);
-	if (fd == -1) {
-		PAM_LOG("Failed to open %s", _PATH_LASTLOG);
-		goto file_err;
-	}
 
-	/*
-	 * Record session in lastlog(5).
-	 */
-	llpos = (off_t)(pwd->pw_uid * sizeof(ll));
-	if (lseek(fd, llpos, L_SET) != llpos)
-		goto file_err;
 	if ((flags & PAM_SILENT) == 0) {
-		if (read(fd, &ll, sizeof ll) == sizeof ll && ll.ll_time != 0) {
-			t = ll.ll_time;
-			if (*ll.ll_host != '\0')
-				pam_info(pamh, "Last login: %.*s from %.*s",
-				    24 - 5, ctime(&t),
-				    (int)sizeof(ll.ll_host), ll.ll_host);
-			else
-				pam_info(pamh, "Last login: %.*s on %.*s",
-				    24 - 5, ctime(&t),
-				    (int)sizeof(ll.ll_line), ll.ll_line);
+		if (ulog_setutxfile(UTXF_LASTLOG, NULL) != 0) {
+			PAM_LOG("Failed to open lastlog database");
+		} else {
+			utx = ulog_getutxuser(user);
+			if (utx != NULL && utx->ut_type == USER_PROCESS) {
+				t = utx->ut_tv.tv_sec;
+				if (*utx->ut_host != '\0')
+					pam_info(pamh, "Last login: %.*s from %s",
+					    24 - 5, ctime(&t), utx->ut_host);
+				else
+					pam_info(pamh, "Last login: %.*s on %s",
+					    24 - 5, ctime(&t), utx->ut_line);
+			}
+			ulog_endutxent();
 		}
-		if (lseek(fd, llpos, L_SET) != llpos)
-			goto file_err;
 	}
 
-	bzero(&ll, sizeof(ll));
-	ll.ll_time = time(NULL);
-
-	/* note: does not need to be NUL-terminated */
-	strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
-	if (rhost != NULL && *(const char *)rhost != '\0')
-		/* note: does not need to be NUL-terminated */
-		strncpy(ll.ll_host, rhost, sizeof(ll.ll_host));
-
-	if (write(fd, (char *)&ll, sizeof(ll)) != sizeof(ll) || close(fd) != 0)
-		goto file_err;
-
-	PAM_LOG("Login recorded in %s", _PATH_LASTLOG);
-
-	/*
-	 * Record session in utmp(5) and wtmp(5).
-	 */
-	bzero(&utmp, sizeof(utmp));
-	utmp.ut_time = time(NULL);
-	/* note: does not need to be NUL-terminated */
-	strncpy(utmp.ut_name, user, sizeof(utmp.ut_name));
-	if (rhost != NULL && *(const char *)rhost != '\0')
-		strncpy(utmp.ut_host, rhost, sizeof(utmp.ut_host));
-	(void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line));
-	login(&utmp);
+	ulog_login(tty, user, rhost);
 
 	return (PAM_SUCCESS);
 
-file_err:
-	syslog(LOG_ERR, "%s: %m", _PATH_LASTLOG);
-	if (fd != -1)
-		close(fd);
-	pam_err = PAM_SYSTEM_ERR;
 err:
 	if (openpam_get_option(pamh, "no_fail"))
 		return (PAM_SUCCESS);
@@ -174,7 +119,7 @@ err:
 }
 
 PAM_EXTERN int
-pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused,
+pam_sm_close_session(pam_handle_t *pamh, int flags __unused,
     int argc __unused, const char *argv[] __unused)
 {
 	const void *tty;
@@ -188,14 +133,7 @@ pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused,
 		pam_err = PAM_SERVICE_ERR;
 		goto err;
 	}
-	if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0)
-		tty = (const char *)tty + strlen(_PATH_DEV);
-	if (*(const char *)tty == '\0')
-		return (PAM_SERVICE_ERR);
-	if (logout(tty) != 1)
-		syslog(LOG_ERR, "%s(): no utmp record for %s",
-		    __func__, (const char *)tty);
-	logwtmp(tty, "", "");
+	ulog_logout(tty);
 	return (PAM_SUCCESS);
 
  err: