name : hostrealm_plugin.h /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */ /* * Copyright (C) 2013 by the Massachusetts Institute of Technology. * 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 hostrealm plugin module implementors. * * The hostrealm pluggable interface currently has only one supported major * version, which is 1. Major version 1 has a current minor version number of * 1. * * Hostrealm plugin modules should define a function named * hostrealm_<modulename>_initvt, matching the signature: * * krb5_error_code * hostrealm_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_hostrealm_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_HOSTREALM_PLUGIN_H #define KRB5_HOSTREALM_PLUGIN_H #include <krb5/krb5.h> #include <krb5/plugin.h> /* An abstract type for hostrealm module data. */ typedef struct krb5_hostrealm_moddata_st *krb5_hostrealm_moddata; /*** Method type declarations ***/ /* Optional: Initialize module data. */ typedef krb5_error_code (*krb5_hostrealm_init_fn)(krb5_context context, krb5_hostrealm_moddata *data); /* * Optional: Determine the possible realms of a hostname, using only secure, * authoritative mechanisms (ones which should be used prior to trying * referrals when getting a service ticket). Return success with a * null-terminated list of realms in *realms_out, KRB5_PLUGIN_NO_HANDLE to * defer to later modules, or another error to terminate processing. */ typedef krb5_error_code (*krb5_hostrealm_host_realm_fn)(krb5_context context, krb5_hostrealm_moddata data, const char *host, char ***realms_out); /* * Optional: Determine the possible realms of a hostname, using heuristic or * less secure mechanisms (ones which should be used after trying referrals * when getting a service ticket). Return success with a null-terminated list * of realms in *realms_out, KRB5_PLUGIN_NO_HANDLE to defer to later modules, * or another error to terminate processing. */ typedef krb5_error_code (*krb5_hostrealm_fallback_realm_fn)(krb5_context context, krb5_hostrealm_moddata data, const char *host, char ***realms_out); /* * Optional: Determine the possible default realms of the local host. Return * success with a null-terminated list of realms in *realms_out, * KRB5_PLUGIN_NO_HANDLE to defer to later modules, or another error to * terminate processing. */ typedef krb5_error_code (*krb5_hostrealm_default_realm_fn)(krb5_context context, krb5_hostrealm_moddata data, char ***realms_out); /* * Mandatory (if any of the query methods are implemented): Release the memory * returned by one of the interface methods. */ typedef void (*krb5_hostrealm_free_list_fn)(krb5_context context, krb5_hostrealm_moddata data, char **list); /* Optional: Release resources used by module data. */ typedef void (*krb5_hostrealm_fini_fn)(krb5_context context, krb5_hostrealm_moddata data); /* hostrealm vtable for major version 1. */ typedef struct krb5_hostrealm_vtable_st { const char *name; /* Mandatory: name of module. */ krb5_hostrealm_init_fn init; krb5_hostrealm_fini_fn fini; krb5_hostrealm_host_realm_fn host_realm; krb5_hostrealm_fallback_realm_fn fallback_realm; krb5_hostrealm_default_realm_fn default_realm; krb5_hostrealm_free_list_fn free_list; /* Minor version 1 ends here. */ } *krb5_hostrealm_vtable; #endif /* KRB5_HOSTREALM_PLUGIN_H */