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kadm5_auth_plugin.h
/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */ /* * Copyright (C) 2017 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 kadm5_auth plugin module implementors. * * The kadm5_auth pluggable interface currently has only one supported major * version, which is 1. Major version 1 has a current minor version number of * 1. * * kadm5_auth plugin modules should define a function named * kadm5_auth_<modulename>_initvt, matching the signature: * * krb5_error_code * kadm5_auth_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_kadm5_auth_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_KADM5_AUTH_PLUGIN_H #define KRB5_KADM5_AUTH_PLUGIN_H #include <krb5/krb5.h> #include <krb5/plugin.h> /* An abstract type for kadm5_auth module data. */ typedef struct kadm5_auth_moddata_st *kadm5_auth_moddata; /* * A module can optionally include <kadm5/admin.h> to inspect principal or * policy records from requests that add or modify principals or policies. * Note that fields of principal and policy structures are only valid if the * corresponding bit is set in the accompanying mask parameter. */ struct _kadm5_principal_ent_t; struct _kadm5_policy_ent_t; /* * A module can optionally generate restrictions when checking permissions for * adding or modifying a principal entry. Restriction fields will only be * honored if the corresponding mask bit is set. The operable mask bits are * defined in <kadmin/admin.h> and are: * * - KADM5_ATTRIBUTES for require_attrs, forbid_attrs * - KADM5_POLICY for policy * - KADM5_POLICY_CLR to require that policy be unset * - KADM5_PRINC_EXPIRE_TIME for princ_lifetime * - KADM5_PW_EXPIRATION for pw_lifetime * - KADM5_MAX_LIFE for max_life * - KADM5_MAX_RLIFE for max_renewable_life */ struct kadm5_auth_restrictions { long mask; krb5_flags require_attrs; krb5_flags forbid_attrs; krb5_deltat princ_lifetime; krb5_deltat pw_lifetime; krb5_deltat max_life; krb5_deltat max_renewable_life; char *policy; }; /*** Method type declarations ***/ /* * Optional: Initialize module data. acl_file is the realm's configured ACL * file, or NULL if none was configured. Return 0 on success, * KRB5_PLUGIN_NO_HANDLE if the module is inoperable (due to configuration, for * example), and any other error code to abort kadmind startup. Optionally set * *data_out to a module data object to be passed to future calls. */ typedef krb5_error_code (*kadm5_auth_init_fn)(krb5_context context, const char *acl_file, kadm5_auth_moddata *data_out); /* Optional: Release resources used by module data. */ typedef void (*kadm5_auth_fini_fn)(krb5_context context, kadm5_auth_moddata data); /* * Each check method below should return 0 to explicitly authorize the request, * KRB5_PLUGIN_NO_HANDLE to neither authorize nor deny the request, and any * other error code (such as EPERM) to explicitly deny the request. If a check * method is not defined, the module will neither authorize nor deny the * request. A request succeeds if at least one kadm5_auth module explicitly * authorizes the request and none of the modules explicitly deny it. */ /* Optional: authorize an add-principal operation, and optionally generate * restrictions. */ typedef krb5_error_code (*kadm5_auth_addprinc_fn)(krb5_context context, kadm5_auth_moddata data, krb5_const_principal client, krb5_const_principal target, const struct _kadm5_principal_ent_t *ent, long mask, struct kadm5_auth_restrictions **rs_out); /* Optional: authorize a modify-principal operation, and optionally generate * restrictions. */ typedef krb5_error_code (*kadm5_auth_modprinc_fn)(krb5_context context, kadm5_auth_moddata data, krb5_const_principal client, krb5_const_principal target, const struct _kadm5_principal_ent_t *ent, long mask, struct kadm5_auth_restrictions **rs_out); /* Optional: authorize a set-string operation. */ typedef krb5_error_code (*kadm5_auth_setstr_fn)(krb5_context context, kadm5_auth_moddata data, krb5_const_principal client, krb5_const_principal target, const char *key, const char *value); /* Optional: authorize a change-password operation. */ typedef krb5_error_code (*kadm5_auth_cpw_fn)(krb5_context context, kadm5_auth_moddata data, krb5_const_principal client, krb5_const_principal target); /* Optional: authorize a randomize-keys operation. */ typedef krb5_error_code (*kadm5_auth_chrand_fn)(krb5_context context, kadm5_auth_moddata data, krb5_const_principal client, krb5_const_principal target); /* Optional: authorize a set-key operation. */ typedef krb5_error_code (*kadm5_auth_setkey_fn)(krb5_context context, kadm5_auth_moddata data, krb5_const_principal client, krb5_const_principal target); /* Optional: authorize a purgekeys operation. */ typedef krb5_error_code (*kadm5_auth_purgekeys_fn)(krb5_context context, kadm5_auth_moddata data, krb5_const_principal client, krb5_const_principal target); /* Optional: authorize a delete-principal operation. */ typedef krb5_error_code (*kadm5_auth_delprinc_fn)(krb5_context context, kadm5_auth_moddata data, krb5_const_principal client, krb5_const_principal target); /* Optional: authorize a rename-principal operation. */ typedef krb5_error_code (*kadm5_auth_renprinc_fn)(krb5_context context, kadm5_auth_moddata data, krb5_const_principal client, krb5_const_principal src, krb5_const_principal dest); /* Optional: authorize a get-principal operation. */ typedef krb5_error_code (*kadm5_auth_getprinc_fn)(krb5_context context, kadm5_auth_moddata data, krb5_const_principal client, krb5_const_principal target); /* Optional: authorize a get-strings operation. */ typedef krb5_error_code (*kadm5_auth_getstrs_fn)(krb5_context context, kadm5_auth_moddata data, krb5_const_principal client, krb5_const_principal target); /* Optional: authorize an extract-keys operation. */ typedef krb5_error_code (*kadm5_auth_extract_fn)(krb5_context context, kadm5_auth_moddata data, krb5_const_principal client, krb5_const_principal target); /* Optional: authorize a list-principals operation. */ typedef krb5_error_code (*kadm5_auth_listprincs_fn)(krb5_context context, kadm5_auth_moddata data, krb5_const_principal client); /* Optional: authorize an add-policy operation. */ typedef krb5_error_code (*kadm5_auth_addpol_fn)(krb5_context context, kadm5_auth_moddata data, krb5_const_principal client, const char *policy, const struct _kadm5_policy_ent_t *ent, long mask); /* Optional: authorize a modify-policy operation. */ typedef krb5_error_code (*kadm5_auth_modpol_fn)(krb5_context context, kadm5_auth_moddata data, krb5_const_principal client, const char *policy, const struct _kadm5_policy_ent_t *ent, long mask); /* Optional: authorize a delete-policy operation. */ typedef krb5_error_code (*kadm5_auth_delpol_fn)(krb5_context context, kadm5_auth_moddata data, krb5_const_principal client, const char *policy); /* Optional: authorize a get-policy operation. client_policy is the client * principal's policy name, or NULL if it does not have one. */ typedef krb5_error_code (*kadm5_auth_getpol_fn)(krb5_context context, kadm5_auth_moddata data, krb5_const_principal client, const char *policy, const char *client_policy); /* Optional: authorize a list-policies operation. */ typedef krb5_error_code (*kadm5_auth_listpols_fn)(krb5_context context, kadm5_auth_moddata data, krb5_const_principal client); /* Optional: authorize an iprop operation. */ typedef krb5_error_code (*kadm5_auth_iprop_fn)(krb5_context context, kadm5_auth_moddata data, krb5_const_principal client); /* * Optional: receive a notification that the most recent authorized operation * has ended. If a kadm5_auth module is also a KDB module, it can assume that * all KDB methods invoked between a kadm5_auth authorization method invocation * and a kadm5_auth end invocation are performed as part of the authorized * operation. * * The end method may be invoked without a preceding authorization method in * some cases; the module must be prepared to ignore such calls. */ typedef void (*kadm5_auth_end_fn)(krb5_context context, kadm5_auth_moddata data); /* * Optional: free a restrictions object. This method does not need to be * defined if the module does not generate restrictions objects, or if it * returns aliases to restrictions objects contained from within the module * data. */ typedef void (*kadm5_auth_free_restrictions_fn)(krb5_context context, kadm5_auth_moddata data, struct kadm5_auth_restrictions *rs); /* kadm5_auth vtable for major version 1. */ typedef struct kadm5_auth_vtable_st { const char *name; /* Mandatory: name of module. */ kadm5_auth_init_fn init; kadm5_auth_fini_fn fini; kadm5_auth_addprinc_fn addprinc; kadm5_auth_modprinc_fn modprinc; kadm5_auth_setstr_fn setstr; kadm5_auth_cpw_fn cpw; kadm5_auth_chrand_fn chrand; kadm5_auth_setkey_fn setkey; kadm5_auth_purgekeys_fn purgekeys; kadm5_auth_delprinc_fn delprinc; kadm5_auth_renprinc_fn renprinc; kadm5_auth_getprinc_fn getprinc; kadm5_auth_getstrs_fn getstrs; kadm5_auth_extract_fn extract; kadm5_auth_listprincs_fn listprincs; kadm5_auth_addpol_fn addpol; kadm5_auth_modpol_fn modpol; kadm5_auth_delpol_fn delpol; kadm5_auth_getpol_fn getpol; kadm5_auth_listpols_fn listpols; kadm5_auth_iprop_fn iprop; kadm5_auth_end_fn end; kadm5_auth_free_restrictions_fn free_restrictions; /* Minor version 1 ends here. */ } *kadm5_auth_vtable; #endif /* KRB5_KADM5_AUTH_PLUGIN_H */