Add conditional build for MIT Kerberos localauth plugin

This patch adds everything what is needed to build the MIT Kerberos
localauth plugin if the used version of MIT Kerberos supports it. It
does not implement the plugin.

Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

3 files changed, 47 insertions, 0 deletions

diff --git a/src/external/krb5.m4 b/src/external/krb5.m4
index 861c8c9fd..90b4a2583 100644
--- a/src/external/krb5.m4
+++ b/src/external/krb5.m4
@@ -96,5 +96,20 @@ AM_CONDITIONAL([BUILD_KRB5_LOCATOR_PLUGIN],
 AM_COND_IF([BUILD_KRB5_LOCATOR_PLUGIN],
            [AC_DEFINE_UNQUOTED(HAVE_KRB5_LOCATOR_PLUGIN, 1, [Build with krb5 locator plugin])])
 
+AC_CHECK_HEADER([krb5/localauth_plugin.h],
+                [have_localauth_plugin=yes],
+                [have_localauth_plugin=no]
+                [AC_MSG_NOTICE([Kerberos localauth plugin cannot be built])],
+                [ #ifdef HAVE_KRB5_KRB5_H
+                  #include <krb5/krb5.h>
+                  #else
+                  #include <krb5.h>
+                  #endif
+                ])
+AM_CONDITIONAL([BUILD_KRB5_LOCALAUTH_PLUGIN],
+               [test x$have_localauth_plugin = xyes])
+AM_COND_IF([BUILD_KRB5_LOCALAUTH_PLUGIN],
+           [AC_DEFINE_UNQUOTED(HAVE_KRB5_LOCALAUTH_PLUGIN, 1, [Build with krb5 localauth plugin])])
+
 CFLAGS=$SAVE_CFLAGS
 LIBS=$SAVE_LIBS
diff --git a/src/krb5_plugin/sssd_krb5_localauth_plugin.c b/src/krb5_plugin/sssd_krb5_localauth_plugin.c
new file mode 100644
index 000000000..93fbbc295
--- /dev/null
+++ b/src/krb5_plugin/sssd_krb5_localauth_plugin.c
@@ -0,0 +1,28 @@
+/*
+    Authors:
+        Sumit Bose <sbose@redhat.com>
+
+    Copyright (C) 2014 Red Hat
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <krb5/localauth_plugin.h>
+
+krb5_error_code
+localauth_sssd_initvt(krb5_context context, int maj_ver, int min_ver,
+                       krb5_plugin_vtable vtable)
+{
+    return KRB5_PLUGIN_VER_NOTSUPP;
+}
diff --git a/src/tests/dlopen-tests.c b/src/tests/dlopen-tests.c
index 52d9c02e1..5eb1ed685 100644
--- a/src/tests/dlopen-tests.c
+++ b/src/tests/dlopen-tests.c
@@ -57,6 +57,10 @@ struct so {
     { "sssd_krb5_locator_plugin.so", { LIBPFX"sssd_krb5_locator_plugin.so",
                                        NULL } },
 #endif
+#ifdef HAVE_KRB5_LOCALAUTH_PLUGIN
+    { "sssd_krb5_localauth_plugin.so", { LIBPFX"sssd_krb5_localauth_plugin.so",
+                                       NULL } },
+#endif
 #ifdef HAVE_PAC_RESPONDER
     { "sssd_pac_plugin.so", { LIBPFX"sssd_pac_plugin.so", NULL } },
 #endif