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diff --git a/src/include/krb5/certauth_plugin.h b/src/include/krb5/certauth_plugin.h
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+++ b/src/include/krb5/certauth_plugin.h
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+/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/* include/krb5/certauth_plugin.h - certauth plugin header. */
+/*
+ * Copyright (C) 2017 by Red Hat, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
+ * COPYRIGHT HOLDER 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.
+ */
+
+/*
+ * Certificate authorization plugin interface.  The PKINIT server module uses
+ * this interface to check client certificate attributes after the certificate
+ * signature has been verified.
+ */
+#ifndef KRB5_CERTAUTH_PLUGIN_H
+#define KRB5_CERTAUTH_PLUGIN_H
+
+#include <krb5/krb5.h>
+#include <krb5/plugin.h>
+
+/* Abstract module data type. */
+typedef struct krb5_certauth_moddata_st *krb5_certauth_moddata;
+
+typedef struct _krb5_db_entry_new krb5_db_entry;
+
+/*
+ * Optional: Initialize module data.
+ */
+typedef krb5_error_code
+(*krb5_certauth_init_fn)(krb5_context context,
+                         krb5_certauth_moddata *moddata_out);
+
+/*
+ * Optional: Clean up the module data.
+ */
+typedef void
+(*krb5_certauth_fini_fn)(krb5_context context, krb5_certauth_moddata moddata);
+
+/*
+ * Mandatory:
+ * Return 0 if the DER-encoded cert is authorized for PKINIT authentication by
+ * princ; otherwise return one of the following error codes:
+ * - KRB5KDC_ERR_CLIENT_NAME_MISMATCH - incorrect SAN value
+ * - KRB5KDC_ERR_INCONSISTENT_KEY_PURPOSE - incorrect EKU
+ * - KRB5KDC_ERR_CERTIFICATE_MISMATCH - other extension error
+ * - KRB5_PLUGIN_NO_HANDLE - the module has no opinion about cert
+ *
+ * - opts is used by built-in modules to receive internal data, and must be
+ *   ignored by other modules.
+ * - db_entry receives the client principal database entry, and can be ignored
+ *   by modules that do not link with libkdb5.
+ * - *authinds_out optionally returns a null-terminated list of authentication
+ *   indicator strings upon KRB5_PLUGIN_NO_HANDLE or accepted authorization.
+ */
+typedef krb5_error_code
+(*krb5_certauth_authorize_fn)(krb5_context context,
+                              krb5_certauth_moddata moddata,
+                              const uint8_t *cert, size_t cert_len,
+                              krb5_const_principal princ, const void *opts,
+                              const krb5_db_entry *db_entry,
+                              char ***authinds_out);
+
+/*
+ * Free indicators allocated by a module.  Mandatory if authorize returns
+ * authentication indicators.
+ */
+typedef void
+(*krb5_certauth_free_indicator_fn)(krb5_context context,
+                                   krb5_certauth_moddata moddata,
+                                   char **authinds);
+
+typedef struct krb5_certauth_vtable_st {
+    char *name;
+    krb5_certauth_init_fn init;
+    krb5_certauth_fini_fn fini;
+    krb5_certauth_authorize_fn authorize;
+    krb5_certauth_free_indicator_fn free_ind;
+} *krb5_certauth_vtable;
+
+#endif /* KRB5_CERTAUTH_PLUGIN_H */