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Diffstat (limited to 'src/include/krb5/certauth_plugin.h')
| -rw-r--r-- | src/include/krb5/certauth_plugin.h | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/src/include/krb5/certauth_plugin.h b/src/include/krb5/certauth_plugin.h new file mode 100644 index 000000000000..3074790f8745 --- /dev/null +++ b/src/include/krb5/certauth_plugin.h @@ -0,0 +1,128 @@ +/* -*- 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. + */ + +/* + * Declarations for certauth plugin module implementors. + * + * The certauth pluggable interface currently has only one supported major + * version, which is 1. Major version 1 has a current minor version number of + * 1. + * + * certauth plugin modules should define a function named + * certauth_<modulename>_initvt, matching the signature: + * + * krb5_error_code + * certauth_modname_initvt(krb5_context context, int maj_ver, int min_ver, + * krb5_plugin_vtable vtable); + * + * The initvt function should: + * + * - Check that the supplied maj_ver number is supported by the module, or + * return KRB5_PLUGIN_VER_NOTSUPP if it is not. + * + * - Cast the vtable pointer as appropriate for maj_ver: + * maj_ver == 1: Cast to krb5_certauth_vtable + * + * - Initialize the methods of the vtable, stopping as appropriate for the + * supplied min_ver. Optional methods may be left uninitialized. + * + * Memory for the vtable is allocated by the caller, not by the module. + */ + +#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; + +/* A module can optionally include <kdb.h> to inspect the client principal + * entry when authorizing a request. */ +struct _krb5_db_entry_new; + +/* + * 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 struct _krb5_db_entry_new *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 { + const 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 */ |