name : localauth_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 localauth plugin module implementors. * * The localauth pluggable interface currently has only one supported major * version, which is 1. Major version 1 has a current minor version number of * 1. * * Localauth plugin modules should define a function named * localauth_<modulename>_initvt, matching the signature: * * krb5_error_code * localauth_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_localauth_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_LOCALAUTH_PLUGIN_H #define KRB5_LOCALAUTH_PLUGIN_H #include <krb5/krb5.h> #include <krb5/plugin.h> /* An abstract type for localauth module data. */ typedef struct krb5_localauth_moddata_st *krb5_localauth_moddata; /*** Method type declarations ***/ /* Optional: Initialize module data. */ typedef krb5_error_code (*krb5_localauth_init_fn)(krb5_context context, krb5_localauth_moddata *data); /* Optional: Release resources used by module data. */ typedef void (*krb5_localauth_fini_fn)(krb5_context context, krb5_localauth_moddata data); /* * Optional: Determine whether aname is authorized to log in as the local * account lname. Return 0 if aname is authorized, EPERM if aname is * authoritatively not authorized, KRB5_PLUGIN_NO_HANDLE if the module cannot * determine whether aname is authorized, and any other error code for a * serious failure to process the request. aname will be considered authorized * if at least one module returns 0 and all other modules return * KRB5_PLUGIN_NO_HANDLE. */ typedef krb5_error_code (*krb5_localauth_userok_fn)(krb5_context context, krb5_localauth_moddata data, krb5_const_principal aname, const char *lname); /* * Optional (mandatory if an2ln_types is set): Determine the local account name * corresponding to aname. Return 0 and set *lname_out if a mapping can be * determined; the contents of *lname_out will later be released with a call to * the module's free_string method. Return KRB5_LNAME_NOTRANS if no mapping * can be determined. Return any other error code for a serious failure to * process the request; this will halt the krb5_aname_to_localname operation. * * If the module's an2ln_types field is set, this method will only be invoked * when a profile "auth_to_local" value references one of the module's types. * type and residual will be set to the type and residual of the auth_to_local * value. * * If the module's an2ln_types field is not set but the an2ln method is * implemented, this method will be invoked independently of the profile's * auth_to_local settings, with type and residual set to NULL. If multiple * modules are registered with an2ln methods but no an2ln_types field, the * order of invocation is not defined, but all such modules will be consulted * before the built-in mechanisms are tried. */ typedef krb5_error_code (*krb5_localauth_an2ln_fn)(krb5_context context, krb5_localauth_moddata data, const char *type, const char *residual, krb5_const_principal aname, char **lname_out); /* * Optional (mandatory if an2ln is implemented): Release the memory returned by * an invocation of an2ln. */ typedef void (*krb5_localauth_free_string_fn)(krb5_context context, krb5_localauth_moddata data, char *str); /* localauth vtable for major version 1. */ typedef struct krb5_localauth_vtable_st { const char *name; /* Mandatory: name of module. */ const char **an2ln_types; /* Optional: uppercase auth_to_local types */ krb5_localauth_init_fn init; krb5_localauth_fini_fn fini; krb5_localauth_userok_fn userok; krb5_localauth_an2ln_fn an2ln; krb5_localauth_free_string_fn free_string; /* Minor version 1 ends here. */ } *krb5_localauth_vtable; #endif /* KRB5_LOCALAUTH_PLUGIN_H */