1 files changed, 95 insertions, 0 deletions
diff --git a/src/lib/krb5/ccache/ccselect_realm.c b/src/lib/krb5/ccache/ccselect_realm.c
new file mode 100644
index 000000000000..3a4b4af136a9
--- /dev/null
+++ b/src/lib/krb5/ccache/ccselect_realm.c
@@ -0,0 +1,95 @@
+/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/* lib/krb5/ccache/ccselect_realm.c - realm ccselect module */
+/*
+ * Copyright (C) 2011 by the Massachusetts Institute of Technology.
+ * All rights reserved.
+ *
+ * Export of this software from the United States of America may
+ *   require a specific license from the United States Government.
+ *   It is the responsibility of any person or organization contemplating
+ *   export to obtain such a license before exporting.
+ *
+ * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+ * distribute this software and its documentation for any purpose and
+ * without fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright notice and
+ * this permission notice appear in supporting documentation, and that
+ * the name of M.I.T. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission.  Furthermore if you modify this software you must label
+ * your software as modified software and not distribute it in such a
+ * fashion that it might be confused with the original M.I.T. software.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose.  It is provided "as is" without express
+ * or implied warranty.
+ */
+
+#include "k5-int.h"
+#include "cc-int.h"
+#include <krb5/ccselect_plugin.h>
+
+static krb5_error_code
+realm_init(krb5_context context, krb5_ccselect_moddata *data_out,
+           int *priority_out)
+{
+    *data_out = NULL;
+    *priority_out = KRB5_CCSELECT_PRIORITY_HEURISTIC;
+    return 0;
+}
+
+static krb5_error_code
+realm_choose(krb5_context context, krb5_ccselect_moddata data,
+             krb5_principal server, krb5_ccache *cache_out,
+             krb5_principal *princ_out)
+{
+    krb5_error_code ret;
+    krb5_cccol_cursor cursor;
+    krb5_ccache cache;
+    krb5_principal princ;
+
+    *cache_out = NULL;
+    *princ_out = NULL;
+
+    if (krb5_is_referral_realm(&server->realm))
+        return KRB5_PLUGIN_NO_HANDLE;
+
+    /* Scan the collection for a cache with a client principal in the same
+     * realm as the server principal. */
+    ret = krb5_cccol_cursor_new(context, &cursor);
+    if (ret)
+        return ret;
+    while ((ret = krb5_cccol_cursor_next(context, cursor, &cache)) == 0 &&
+           cache != NULL) {
+        ret = krb5_cc_get_principal(context, cache, &princ);
+        if (ret == 0) {
+            if (data_eq(princ->realm, server->realm))
+                break;
+            krb5_free_principal(context, princ);
+        }
+        krb5_cc_close(context, cache);
+    }
+    krb5_cccol_cursor_free(context, &cursor);
+    if (ret)
+        return ret;
+
+    if (cache == NULL)
+        return KRB5_PLUGIN_NO_HANDLE;
+    *cache_out = cache;
+    *princ_out = princ;
+    return 0;
+}
+
+krb5_error_code
+ccselect_realm_initvt(krb5_context context, int maj_ver, int min_ver,
+                      krb5_plugin_vtable vtable)
+{
+    krb5_ccselect_vtable vt;
+
+    if (maj_ver != 1)
+        return KRB5_PLUGIN_VER_NOTSUPP;
+    vt = (krb5_ccselect_vtable)vtable;
+    vt->name = "realm";
+    vt->init = realm_init;
+    vt->choose = realm_choose;
+    return 0;
+}