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pam/pam_lastlog.diff

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2008-09-30 Tomas Mraz <t8m@centrum.cz>
* modules/pam_lastlog/pam_lastlog.8.xml: Document new options
noupdate and showfailed.
* modules/pam_lastlog/pam_lastlog.c(pam_parse): Recognize the new
options.
(last_login_read): New output parameter lltime. Do not display
the last login message if it would be empty.
(last_login_date): New output parameter lltime. Do not write the
last login info when LASTLOG_UPDATE is not set.
(last_login_failed): New function to display the last bad login
attempt from btmp.
(pam_sm_open_session): Obtain lltime from last_login_date() and
call last_login_failed() when appropriate.
--- modules/pam_lastlog/pam_lastlog.8.xml 9 Jun 2006 16:44:07 -0000 1.2
+++ modules/pam_lastlog/pam_lastlog.8.xml 30 Sep 2008 14:40:39 -0000 1.5
@@ -39,6 +39,12 @@
<arg choice="opt">
nowtmp
</arg>
+ <arg choice="opt">
+ noupdate
+ </arg>
+ <arg choice="opt">
+ showfailed
+ </arg>
</cmdsynopsis>
</refsynopsisdiv>
@@ -137,13 +143,35 @@
</para>
</listitem>
</varlistentry>
+ <varlistentry>
+ <term>
+ <option>noupdate</option>
+ </term>
+ <listitem>
+ <para>
+ Don't update any file.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>showfailed</option>
+ </term>
+ <listitem>
+ <para>
+ Display number of failed login attempts and the date of the
+ last failed attempt from btmp. The date is not displayed
+ when <option>nodate</option> is specified.
+ </para>
+ </listitem>
+ </varlistentry>
</variablelist>
</refsect1>
- <refsect1 id="pam_lastlog-services">
- <title>MODULE SERVICES PROVIDED</title>
+ <refsect1 id="pam_lastlog-types">
+ <title>MODULE TYPES PROVIDED</title>
<para>
- Only the <option>session</option> service is supported.
+ Only the <option>session</option> module type is provided.
</para>
</refsect1>
@@ -213,7 +241,7 @@
<refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum>
</citerefentry>,
<citerefentry>
- <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum>
+ <refentrytitle>pam.d</refentrytitle><manvolnum>5</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum>
--- modules/pam_lastlog/pam_lastlog.c 24 Aug 2006 18:29:30 -0000 1.23
+++ modules/pam_lastlog/pam_lastlog.c 30 Sep 2008 14:40:39 -0000 1.24
@@ -46,6 +46,10 @@
};
#endif /* hpux */
+#ifndef _PATH_BTMP
+# define _PATH_BTMP "/var/log/btmp"
+#endif
+
/* XXX - time before ignoring lock. Is 1 sec enough? */
#define LASTLOG_IGNORE_LOCK_TIME 1
@@ -75,11 +79,13 @@
#define LASTLOG_DEBUG 020 /* send info to syslog(3) */
#define LASTLOG_QUIET 040 /* keep quiet about things */
#define LASTLOG_WTMP 0100 /* log to wtmp as well as lastlog */
+#define LASTLOG_BTMP 0200 /* display failed login info from btmp */
+#define LASTLOG_UPDATE 0400 /* update the lastlog and wtmp files (default) */
static int
_pam_parse(pam_handle_t *pamh, int flags, int argc, const char **argv)
{
- int ctrl=(LASTLOG_DATE|LASTLOG_HOST|LASTLOG_LINE|LASTLOG_WTMP);
+ int ctrl=(LASTLOG_DATE|LASTLOG_HOST|LASTLOG_LINE|LASTLOG_WTMP|LASTLOG_UPDATE);
/* does the appliction require quiet? */
if (flags & PAM_SILENT) {
@@ -105,6 +111,10 @@
ctrl |= LASTLOG_NEVER;
} else if (!strcmp(*argv,"nowtmp")) {
ctrl &= ~LASTLOG_WTMP;
+ } else if (!strcmp(*argv,"noupdate")) {
+ ctrl &= ~(LASTLOG_WTMP|LASTLOG_UPDATE);
+ } else if (!strcmp(*argv,"showfailed")) {
+ ctrl |= LASTLOG_BTMP;
} else {
pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv);
}
@@ -135,7 +145,7 @@
}
static int
-last_login_read(pam_handle_t *pamh, int announce, int last_fd, uid_t uid)
+last_login_read(pam_handle_t *pamh, int announce, int last_fd, uid_t uid, time_t *lltime)
{
struct flock last_lock;
struct lastlog last_login;
@@ -166,6 +176,7 @@
last_lock.l_type = F_UNLCK;
(void) fcntl(last_fd, F_SETLK, &last_lock); /* unlock */
+ *lltime = last_login.ll_time;
if (!last_login.ll_time) {
if (announce & LASTLOG_DEBUG) {
pam_syslog(pamh, LOG_DEBUG,
@@ -216,8 +227,9 @@
}
}
- /* TRANSLATORS: "Last login: <date> from <host> on <terminal>" */
- retval = pam_info(pamh, _("Last login:%s%s%s"),
+ if (date != NULL || host != NULL || line != NULL)
+ /* TRANSLATORS: "Last login: <date> from <host> on <terminal>" */
+ retval = pam_info(pamh, _("Last login:%s%s%s"),
date ? date : "",
host ? host : "",
line ? line : "");
@@ -320,13 +332,13 @@
}
static int
-last_login_date(pam_handle_t *pamh, int announce, uid_t uid, const char *user)
+last_login_date(pam_handle_t *pamh, int announce, uid_t uid, const char *user, time_t *lltime)
{
int retval;
int last_fd;
/* obtain the last login date and all the relevant info */
- last_fd = open(_PATH_LASTLOG, O_RDWR);
+ last_fd = open(_PATH_LASTLOG, announce&LASTLOG_UPDATE ? O_RDWR : O_RDONLY);
if (last_fd < 0) {
if (errno == ENOENT) {
last_fd = open(_PATH_LASTLOG, O_RDWR|O_CREAT,
@@ -353,7 +365,7 @@
return PAM_SERVICE_ERR;
}
- retval = last_login_read(pamh, announce, last_fd, uid);
+ retval = last_login_read(pamh, announce, last_fd, uid, lltime);
if (retval != PAM_SUCCESS)
{
close(last_fd);
@@ -361,7 +373,9 @@
return retval;
}
- retval = last_login_write(pamh, announce, last_fd, uid, user);
+ if (announce & LASTLOG_UPDATE) {
+ retval = last_login_write(pamh, announce, last_fd, uid, user);
+ }
close(last_fd);
D(("all done with last login"));
@@ -369,6 +383,121 @@
return retval;
}
+static int
+last_login_failed(pam_handle_t *pamh, int announce, const char *user, time_t lltime)
+{
+ int retval;
+ int fd;
+ struct utmp ut;
+ struct utmp utuser;
+ int failed = 0;
+ char the_time[256];
+ char *date = NULL;
+ char *host = NULL;
+ char *line = NULL;
+
+ if (strlen(user) > UT_NAMESIZE) {
+ pam_syslog(pamh, LOG_WARNING, "username too long, output might be inaccurate");
+ }
+
+ /* obtain the failed login attempt records from btmp */
+ fd = open(_PATH_BTMP, O_RDONLY);
+ if (fd < 0) {
+ pam_syslog(pamh, LOG_ERR, "unable to open %s: %m", _PATH_BTMP);
+ D(("unable to open %s file", _PATH_BTMP));
+ return PAM_SERVICE_ERR;
+ }
+
+ while ((retval=pam_modutil_read(fd, (void *)&ut,
+ sizeof(ut))) == sizeof(ut)) {
+ if (ut.ut_tv.tv_sec >= lltime && strncmp(ut.ut_user, user, UT_NAMESIZE) == 0) {
+ memcpy(&utuser, &ut, sizeof(utuser));
+ failed++;
+ }
+ }
+
+ if (failed) {
+ /* we want the date? */
+ if (announce & LASTLOG_DATE) {
+ struct tm *tm, tm_buf;
+ time_t lf_time;
+
+ lf_time = utuser.ut_tv.tv_sec;
+ tm = localtime_r (&lf_time, &tm_buf);
+ strftime (the_time, sizeof (the_time),
+ /* TRANSLATORS: "strftime options for date of last login" */
+ _(" %a %b %e %H:%M:%S %Z %Y"), tm);
+
+ date = the_time;
+ }
+
+ /* we want & have the host? */
+ if ((announce & LASTLOG_HOST)
+ && (utuser.ut_host[0] != '\0')) {
+ /* TRANSLATORS: " from <host>" */
+ if (asprintf(&host, _(" from %.*s"), UT_HOSTSIZE,
+ utuser.ut_host) < 0) {
+ pam_syslog(pamh, LOG_ERR, "out of memory");
+ retval = PAM_BUF_ERR;
+ goto cleanup;
+ }
+ }
+
+ /* we want and have the terminal? */
+ if ((announce & LASTLOG_LINE)
+ && (utuser.ut_line[0] != '\0')) {
+ /* TRANSLATORS: " on <terminal>" */
+ if (asprintf(&line, _(" on %.*s"), UT_LINESIZE,
+ utuser.ut_line) < 0) {
+ pam_syslog(pamh, LOG_ERR, "out of memory");
+ retval = PAM_BUF_ERR;
+ goto cleanup;
+ }
+ }
+
+ if (line != NULL || date != NULL || host != NULL) {
+ /* TRANSLATORS: "Last failed login: <date> from <host> on <terminal>" */
+ pam_info(pamh, _("Last failed login:%s%s%s"),
+ date ? date : "",
+ host ? host : "",
+ line ? line : "");
+ }
+
+ _pam_drop(line);
+#if defined HAVE_DNGETTEXT && defined ENABLE_NLS
+ retval = asprintf (&line, dngettext(PACKAGE,
+ "There was %d failed login attempt since the last successful login.",
+ "There were %d failed login attempts since the last successful login.",
+ failed),
+ failed);
+#else
+ if (daysleft == 1)
+ retval = asprintf(&line,
+ _("There was %d failed login attempt since the last successful login."),
+ failed);
+ else
+ retval = asprintf(&line,
+ /* TRANSLATORS: only used if dngettext is not supported */
+ _("There were %d failed login attempts since the last successful login."),
+ failed);
+#endif
+ if (retval >= 0)
+ retval = pam_info(pamh, "%s", line);
+ else {
+ retval = PAM_BUF_ERR;
+ line = NULL;
+ }
+ }
+
+cleanup:
+ free(host);
+ free(line);
+ close(fd);
+ D(("all done with btmp"));
+
+ return retval;
+}
+
/* --- authentication management functions (only) --- */
PAM_EXTERN int
@@ -379,6 +508,7 @@
const void *user;
const struct passwd *pwd;
uid_t uid;
+ time_t lltime = 0;
/*
* this module gets the uid of the PAM_USER. Uses it to display
@@ -407,7 +537,11 @@
/* process the current login attempt (indicate last) */
- retval = last_login_date(pamh, ctrl, uid, user);
+ retval = last_login_date(pamh, ctrl, uid, user, &lltime);
+
+ if ((ctrl & LASTLOG_BTMP) && retval == PAM_SUCCESS) {
+ retval = last_login_failed(pamh, ctrl, user, lltime);
+ }
/* indicate success or failure */
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