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gdm/gdm-2.19.1-audit-login.patch
Matthias Clasen 6941265f47 Update tons of patches
2007-05-21 18:00:19 +00:00

172 lines
5.7 KiB
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--- gdm-2.19.1/daemon/verify-pam.c.audit-login 2007-05-13 22:08:24.000000000 -0400
+++ gdm-2.19.1/daemon/verify-pam.c 2007-05-21 11:59:00.000000000 -0400
@@ -55,6 +55,14 @@
#include <bsm/adt_event.h>
#endif /* HAVE_ADT */
+#define AU_FAILED 0
+#define AU_SUCCESS 1
+#ifdef HAVE_LIBAUDIT
+#include <libaudit.h>
+#else
+#define log_to_audit_system(l,h,d,s) do { ; } while (0)
+#endif
+
/* Evil, but this way these things are passed to the child session */
static pam_handle_t *pamh = NULL;
@@ -789,6 +797,54 @@ create_pamh (GdmDisplay *d,
}
/**
+ * log_to_audit_system:
+ * @login: Name of user
+ * @hostname: Name of host machine
+ * @tty: Name of display
+ * @success: 1 for success, 0 for failure
+ *
+ * Logs the success or failure of the login attempt with the linux kernel
+ * audit system. The intent is to capture failed events where the user
+ * fails authentication or otherwise is not permitted to login. There are
+ * many other places where pam could potentially fail and cause login to
+ * fail, but these are system failures rather than the signs of an account
+ * being hacked.
+ *
+ * Returns nothing.
+ */
+
+#ifdef HAVE_LIBAUDIT
+static void
+log_to_audit_system(const char *login,
+ const char *hostname,
+ const char *tty,
+ gboolean success)
+{
+ struct passwd *pw;
+ char buf[64];
+ int audit_fd;
+
+ audit_fd = audit_open();
+ if (login)
+ pw = getpwnam(login);
+ else {
+ login = "unknown";
+ pw = NULL;
+ }
+ if (pw) {
+ snprintf(buf, sizeof(buf), "uid=%d", pw->pw_uid);
+ audit_log_user_message(audit_fd, AUDIT_USER_LOGIN,
+ buf, hostname, NULL, tty, (int)success);
+ } else {
+ snprintf(buf, sizeof(buf), "acct=%s", login);
+ audit_log_user_message(audit_fd, AUDIT_USER_LOGIN,
+ buf, hostname, NULL, tty, (int)success);
+ }
+ close(audit_fd);
+}
+#endif
+
+/**
* gdm_verify_user:
* @username: Name of user or NULL if we should ask
* @display: Name of display to register with the authentication system
@@ -910,6 +966,8 @@ gdm_verify_user (GdmDisplay *d,
/* Start authentication session */
did_we_ask_for_password = FALSE;
if ((pamerr = pam_authenticate (pamh, null_tok)) != PAM_SUCCESS) {
+ /* Log the failed login attempt */
+ log_to_audit_system(login, d->hostname, display, AU_FAILED);
if ( ! ve_string_empty (selected_user)) {
pam_handle_t *tmp_pamh;
@@ -1030,6 +1088,8 @@ gdm_verify_user (GdmDisplay *d,
( ! gdm_daemon_config_get_value_bool (GDM_KEY_ALLOW_REMOTE_ROOT) && ! local) ) &&
pwent != NULL &&
pwent->pw_uid == 0) {
+ /* Log the failed login attempt */
+ log_to_audit_system(login, d->hostname, display, AU_FAILED);
gdm_error (_("Root login disallowed on display '%s'"),
display);
gdm_slave_greeter_ctl_no_ret (GDM_ERRBOX,
@@ -1063,6 +1123,8 @@ gdm_verify_user (GdmDisplay *d,
break;
case PAM_NEW_AUTHTOK_REQD :
if ((pamerr = pam_chauthtok (pamh, PAM_CHANGE_EXPIRED_AUTHTOK)) != PAM_SUCCESS) {
+ /* Log the failed login attempt */
+ log_to_audit_system(login, d->hostname, display, AU_FAILED);
gdm_error (_("Authentication token change failed for user %s"), login);
gdm_slave_greeter_ctl_no_ret (GDM_ERRBOX,
_("\nThe change of the authentication token failed. "
@@ -1080,18 +1142,24 @@ gdm_verify_user (GdmDisplay *d,
#endif /* HAVE_ADT */
break;
case PAM_ACCT_EXPIRED :
+ /* Log the failed login attempt */
+ log_to_audit_system(login, d->hostname, display, AU_FAILED);
gdm_error (_("User %s no longer permitted to access the system"), login);
gdm_slave_greeter_ctl_no_ret (GDM_ERRBOX,
_("\nThe system administrator has disabled your account."));
error_msg_given = TRUE;
goto pamerr;
case PAM_PERM_DENIED :
+ /* Log the failed login attempt */
+ log_to_audit_system(login, d->hostname, display, AU_FAILED);
gdm_error (_("User %s not permitted to gain access at this time"), login);
gdm_slave_greeter_ctl_no_ret (GDM_ERRBOX,
_("\nThe system administrator has disabled access to the system temporarily."));
error_msg_given = TRUE;
goto pamerr;
default :
+ /* Log the failed login attempt */
+ log_to_audit_system(login, d->hostname, display, AU_FAILED);
if (gdm_slave_action_pending ())
gdm_error (_("Couldn't set acct. mgmt for %s"), login);
goto pamerr;
@@ -1143,6 +1211,8 @@ gdm_verify_user (GdmDisplay *d,
gdm_error (_("Couldn't open session for %s"), login);
goto pamerr;
}
+ /* Login succeeded */
+ log_to_audit_system(login, d->hostname, display, AU_SUCCESS);
/* Workaround to avoid gdm messages being logged as PAM_pwdb */
gdm_log_shutdown ();
--- gdm-2.19.1/configure.ac.audit-login 2007-05-13 22:08:48.000000000 -0400
+++ gdm-2.19.1/configure.ac 2007-05-21 11:37:59.000000000 -0400
@@ -837,6 +837,10 @@ else
fi
AC_SUBST(logdir, $GDM_LOG_DIR)
+AC_ARG_WITH(libaudit,
+ [ --with-libaudit=[auto/yes/no] Add Linux audit support [default=auto]],,
+ with_libaudit=auto)
+
withval=""
AC_ARG_WITH(at-bindir,
[ --with-at-bindir=<PATH> PATH to Accessible Technology programs [default=BINDIR]],)
@@ -948,6 +952,24 @@ else
AC_MSG_RESULT(no)
fi
+# Check for Linux auditing API
+#
+# libaudit detection
+if test x$with_libaudit = xno ; then
+ have_libaudit=no;
+else
+ # See if we have audit daemon library
+ AC_CHECK_LIB(audit, audit_log_user_message,
+ have_libaudit=yes, have_libaudit=no)
+fi
+
+AM_CONDITIONAL(HAVE_LIBAUDIT, test x$have_libaudit = xyes)
+
+if test x$have_libaudit = xyes ; then
+ EXTRA_DAEMON_LIBS="$EXTRA_DAEMON_LIBS -laudit"
+ AC_DEFINE(HAVE_LIBAUDIT,1,[linux audit support])
+fi
+
# Check for Solaris auditing API
# Note, Solaris auditing not supported for Solaris 9 or earlier and
# should not be used on these versions of Solaris if auditing is
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