1 files changed, 91 insertions, 0 deletions
diff --git a/third_party/heimdal/kdc/csr_authorizer.c b/third_party/heimdal/kdc/csr_authorizer.c
new file mode 100644
index 0000000..52bc37c
--- /dev/null
+++ b/third_party/heimdal/kdc/csr_authorizer.c
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2019 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "kdc_locl.h"
+#include "csr_authorizer_plugin.h"
+
+struct plctx {
+    const char              *app;
+    hx509_request           csr;
+    krb5_const_principal    client;
+    krb5_boolean            result;
+};
+
+static krb5_error_code KRB5_LIB_CALL
+plcallback(krb5_context context, const void *plug, void *plugctx, void *userctx)
+{
+    const krb5plugin_csr_authorizer_ftable *authorizer = plug;
+    struct plctx *plctx = userctx;
+
+    return authorizer->authorize(plugctx, context, plctx->app, plctx->csr,
+                                 plctx->client, &plctx->result);
+}
+
+static const char *plugin_deps[] = { "krb5", NULL };
+
+static struct heim_plugin_data csr_authorizer_data = {
+    "kdc",
+    KDC_CSR_AUTHORIZER,
+    1,
+    plugin_deps,
+    krb5_get_instance
+};
+
+/*
+ * Invoke a plugin to validate a JWT/SAML/OIDC token and partially-evaluate
+ * access control.
+ */
+KDC_LIB_FUNCTION krb5_error_code KDC_LIB_CALL
+kdc_authorize_csr(krb5_context context,
+                  const char *app,
+                  hx509_request csr,
+                  krb5_const_principal client)
+{
+    krb5_error_code ret;
+    struct plctx ctx;
+
+    ctx.app = app;
+    ctx.csr = csr;
+    ctx.client = client;
+    ctx.result = FALSE;
+
+    ret = _krb5_plugin_run_f(context, &csr_authorizer_data, 0, &ctx,
+                             plcallback);
+    if (ret)
+        krb5_prepend_error_message(context, ret, "Authorization of requested "
+                                   "certificate extensions failed");
+    else if (!ctx.result)
+        krb5_set_error_message(context, ret, "Authorization of requested "
+                               "certificate extensions failed");
+    return ret;
+}