648 lines
15 KiB
C
648 lines
15 KiB
C
/*
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* Copyright (c) 2007 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Portions (c) 2021, 2022 PADL Software Pty Ltd.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "kdc_locl.h"
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static int have_plugin = 0;
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/*
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* Pick the first KDC plugin module that we find.
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*/
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static const char *kdc_plugin_deps[] = {
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"kdc",
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"krb5",
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"hdb",
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NULL
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};
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static struct heim_plugin_data kdc_plugin_data = {
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"krb5",
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"kdc",
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KRB5_PLUGIN_KDC_VERSION_10,
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kdc_plugin_deps,
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kdc_get_instance
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};
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static krb5_error_code KRB5_LIB_CALL
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load(krb5_context context, const void *plug, void *plugctx, void *userctx)
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{
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have_plugin = 1;
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return KRB5_PLUGIN_NO_HANDLE;
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}
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KDC_LIB_FUNCTION krb5_error_code KDC_LIB_CALL
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krb5_kdc_plugin_init(krb5_context context)
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{
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(void)_krb5_plugin_run_f(context, &kdc_plugin_data, 0, NULL, load);
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return 0;
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}
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struct generate_uc {
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krb5_kdc_configuration *config;
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hdb_entry *client;
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hdb_entry *server;
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const krb5_keyblock *reply_key;
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uint64_t pac_attributes;
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krb5_pac *pac;
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};
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static krb5_error_code KRB5_LIB_CALL
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generate(krb5_context context, const void *plug, void *plugctx, void *userctx)
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{
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const krb5plugin_kdc_ftable *ft = (const krb5plugin_kdc_ftable *)plug;
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struct generate_uc *uc = (struct generate_uc *)userctx;
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if (ft->pac_generate == NULL)
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return KRB5_PLUGIN_NO_HANDLE;
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return ft->pac_generate((void *)plug,
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context,
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uc->config,
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uc->client,
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uc->server,
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uc->reply_key,
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uc->pac_attributes,
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uc->pac);
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}
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krb5_error_code
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_kdc_pac_generate(krb5_context context,
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krb5_kdc_configuration *config,
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hdb_entry *client,
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hdb_entry *server,
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const krb5_keyblock *reply_key,
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uint64_t pac_attributes,
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krb5_pac *pac)
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{
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krb5_error_code ret = 0;
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struct generate_uc uc;
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*pac = NULL;
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if (krb5_config_get_bool_default(context, NULL, FALSE, "realms",
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client->principal->realm,
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"disable_pac", NULL))
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return 0;
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if (have_plugin) {
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uc.config = config;
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uc.client = client;
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uc.server = server;
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uc.reply_key = reply_key;
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uc.pac = pac;
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uc.pac_attributes = pac_attributes;
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ret = _krb5_plugin_run_f(context, &kdc_plugin_data,
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0, &uc, generate);
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if (ret != KRB5_PLUGIN_NO_HANDLE)
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return ret;
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ret = 0;
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}
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if (*pac == NULL)
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ret = krb5_pac_init(context, pac);
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return ret;
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}
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struct verify_uc {
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krb5_kdc_configuration *config;
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krb5_principal client_principal;
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krb5_principal delegated_proxy_principal;
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hdb_entry *client;
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hdb_entry *server;
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hdb_entry *krbtgt;
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krb5_pac *pac;
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};
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static krb5_error_code KRB5_LIB_CALL
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verify(krb5_context context, const void *plug, void *plugctx, void *userctx)
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{
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const krb5plugin_kdc_ftable *ft = (const krb5plugin_kdc_ftable *)plug;
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struct verify_uc *uc = (struct verify_uc *)userctx;
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krb5_error_code ret;
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if (ft->pac_verify == NULL)
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return KRB5_PLUGIN_NO_HANDLE;
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ret = ft->pac_verify((void *)plug,
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context,
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uc->config,
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uc->client_principal,
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uc->delegated_proxy_principal,
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uc->client, uc->server, uc->krbtgt, uc->pac);
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return ret;
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}
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krb5_error_code
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_kdc_pac_verify(krb5_context context,
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krb5_kdc_configuration *config,
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const krb5_principal client_principal,
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const krb5_principal delegated_proxy_principal,
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hdb_entry *client,
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hdb_entry *server,
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hdb_entry *krbtgt,
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krb5_pac *pac)
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{
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struct verify_uc uc;
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if (!have_plugin)
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return KRB5_PLUGIN_NO_HANDLE;
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uc.config = config;
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uc.client_principal = client_principal;
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uc.delegated_proxy_principal = delegated_proxy_principal;
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uc.client = client;
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uc.server = server;
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uc.krbtgt = krbtgt;
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uc.pac = pac;
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return _krb5_plugin_run_f(context, &kdc_plugin_data,
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0, &uc, verify);
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}
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static krb5_error_code KRB5_LIB_CALL
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check(krb5_context context, const void *plug, void *plugctx, void *userctx)
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{
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const krb5plugin_kdc_ftable *ft = (const krb5plugin_kdc_ftable *)plug;
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if (ft->client_access == NULL)
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return KRB5_PLUGIN_NO_HANDLE;
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return ft->client_access((void *)plug, userctx);
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}
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krb5_error_code
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_kdc_check_access(astgs_request_t r)
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{
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krb5_error_code ret = KRB5_PLUGIN_NO_HANDLE;
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if (have_plugin) {
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ret = _krb5_plugin_run_f(r->context, &kdc_plugin_data,
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0, r, check);
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}
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if (ret == KRB5_PLUGIN_NO_HANDLE)
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return kdc_check_flags(r, r->req.msg_type == krb_as_req,
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r->client, r->server);
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return ret;
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}
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static krb5_error_code KRB5_LIB_CALL
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referral_policy(krb5_context context, const void *plug, void *plugctx, void *userctx)
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{
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const krb5plugin_kdc_ftable *ft = (const krb5plugin_kdc_ftable *)plug;
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if (ft->referral_policy == NULL)
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return KRB5_PLUGIN_NO_HANDLE;
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return ft->referral_policy((void *)plug, userctx);
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}
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krb5_error_code
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_kdc_referral_policy(astgs_request_t r)
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{
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krb5_error_code ret = KRB5_PLUGIN_NO_HANDLE;
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if (have_plugin)
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ret = _krb5_plugin_run_f(r->context, &kdc_plugin_data, 0, r, referral_policy);
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return ret;
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}
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static krb5_error_code KRB5_LIB_CALL
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finalize_reply(krb5_context context, const void *plug, void *plugctx, void *userctx)
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{
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const krb5plugin_kdc_ftable *ft = (const krb5plugin_kdc_ftable *)plug;
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if (ft->finalize_reply == NULL)
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return KRB5_PLUGIN_NO_HANDLE;
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return ft->finalize_reply((void *)plug, userctx);
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}
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krb5_error_code
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_kdc_finalize_reply(astgs_request_t r)
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{
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krb5_error_code ret = KRB5_PLUGIN_NO_HANDLE;
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if (have_plugin)
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ret = _krb5_plugin_run_f(r->context, &kdc_plugin_data, 0, r, finalize_reply);
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if (ret == KRB5_PLUGIN_NO_HANDLE)
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ret = 0;
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return ret;
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}
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static krb5_error_code KRB5_LIB_CALL
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audit(krb5_context context, const void *plug, void *plugctx, void *userctx)
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{
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const krb5plugin_kdc_ftable *ft = (const krb5plugin_kdc_ftable *)plug;
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if (ft->audit == NULL)
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return KRB5_PLUGIN_NO_HANDLE;
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return ft->audit((void *)plug, userctx);
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}
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krb5_error_code
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_kdc_plugin_audit(astgs_request_t r)
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{
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krb5_error_code ret = KRB5_PLUGIN_NO_HANDLE;
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if (have_plugin)
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ret = _krb5_plugin_run_f(r->context, &kdc_plugin_data, 0, r, audit);
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if (ret == KRB5_PLUGIN_NO_HANDLE)
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ret = 0;
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return ret;
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}
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KDC_LIB_FUNCTION uintptr_t KDC_LIB_CALL
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kdc_get_instance(const char *libname)
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{
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static const char *instance = "libkdc";
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if (strcmp(libname, "kdc") == 0)
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return (uintptr_t)instance;
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else if (strcmp(libname, "hdb") == 0)
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return hdb_get_instance(libname);
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else if (strcmp(libname, "krb5") == 0)
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return krb5_get_instance(libname);
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else if (strcmp(libname, "gssapi") == 0)
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return gss_get_instance(libname);
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return 0;
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}
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/*
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* Minimum API surface wrapper for libheimbase object types so it
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* may remain a private interface, yet plugins can interact with
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* objects.
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*/
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KDC_LIB_FUNCTION kdc_object_t KDC_LIB_CALL
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kdc_object_alloc(size_t size, const char *name, kdc_type_dealloc dealloc)
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{
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return heim_alloc(size, name, dealloc);
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}
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KDC_LIB_FUNCTION kdc_object_t KDC_LIB_CALL
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kdc_object_retain(kdc_object_t o)
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{
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return heim_retain(o);
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}
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KDC_LIB_FUNCTION void KDC_LIB_CALL
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kdc_object_release(kdc_object_t o)
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{
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heim_release(o);
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}
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KDC_LIB_FUNCTION kdc_object_t KDC_LIB_CALL
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kdc_bool_create(krb5_boolean v)
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{
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return heim_bool_create(v);
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}
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KDC_LIB_FUNCTION krb5_boolean KDC_LIB_CALL
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kdc_bool_get_value(kdc_object_t o)
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{
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return heim_bool_val(o);
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}
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struct kdc_array_iterator_trampoline_data {
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kdc_array_iterator_t iter;
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void *data;
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};
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/*
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* Calling convention shim to avoid needing to update all internal
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* consumers of heim_array_iterate_f()
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*/
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static void
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_kdc_array_iterator_trampoline(kdc_object_t o, void *data, int *stop)
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{
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struct kdc_array_iterator_trampoline_data *t = data;
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t->iter(o, t->data, stop);
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}
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KDC_LIB_FUNCTION void KDC_LIB_CALL
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kdc_array_iterate(kdc_array_t a, void *d, kdc_array_iterator_t iter)
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{
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struct kdc_array_iterator_trampoline_data t;
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t.iter = iter;
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t.data = d;
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heim_array_iterate_f((heim_array_t)a, &t, _kdc_array_iterator_trampoline);
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}
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KDC_LIB_FUNCTION size_t KDC_LIB_CALL
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kdc_array_get_length(kdc_array_t a)
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{
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return heim_array_get_length((heim_array_t)a);
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}
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KDC_LIB_FUNCTION kdc_object_t KDC_LIB_CALL
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kdc_array_get_value(heim_array_t a, size_t i)
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{
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return heim_array_get_value((heim_array_t)a, i);
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}
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KDC_LIB_FUNCTION kdc_object_t KDC_LIB_CALL
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kdc_array_copy_value(heim_array_t a, size_t i)
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{
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return heim_array_copy_value((heim_array_t)a, i);
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}
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KDC_LIB_FUNCTION kdc_string_t KDC_LIB_CALL
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kdc_string_create(const char *s)
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{
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return (kdc_string_t)heim_string_create(s);
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}
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KDC_LIB_FUNCTION const char * KDC_LIB_CALL
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kdc_string_get_utf8(kdc_string_t s)
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{
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return heim_string_get_utf8((heim_string_t)s);
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}
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KDC_LIB_FUNCTION kdc_data_t
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kdc_data_create(const void *d, size_t len)
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{
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return (kdc_data_t)heim_data_create(d, len);
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}
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KDC_LIB_FUNCTION const krb5_data * KDC_LIB_CALL
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kdc_data_get_data(kdc_data_t d)
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{
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return heim_data_get_data((heim_data_t)d);
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}
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KDC_LIB_FUNCTION kdc_number_t KDC_LIB_CALL
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kdc_number_create(int64_t v)
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{
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return (kdc_number_t)heim_number_create(v);
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}
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KDC_LIB_FUNCTION int64_t KDC_LIB_CALL
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kdc_number_get_value(kdc_number_t n)
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{
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return heim_number_get_long((heim_number_t)n);
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}
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/*
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* Plugin accessors
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*/
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KDC_LIB_FUNCTION krb5_error_code KDC_LIB_CALL
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kdc_request_add_reply_padata(astgs_request_t r, PA_DATA *md)
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{
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heim_assert(r->rep.padata != NULL, "reply padata not allocated");
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return add_METHOD_DATA(r->rep.padata, md);
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}
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KDC_LIB_FUNCTION krb5_error_code KDC_LIB_CALL
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kdc_request_add_pac_buffer(astgs_request_t r,
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uint32_t pactype,
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const krb5_data *d)
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{
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krb5_error_code ret;
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krb5_pac pac;
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if (r->pac == NULL) {
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ret = krb5_pac_init(r->context, &pac);
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if (ret)
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return ret;
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} else
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pac = heim_retain(r->pac);
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ret = krb5_pac_add_buffer(r->context, pac, pactype, d);
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if (ret == 0 && r->pac == NULL)
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r->pac = pac;
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else
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heim_release(pac);
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return ret;
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}
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#undef _KDC_REQUEST_GET_ACCESSOR
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#define _KDC_REQUEST_GET_ACCESSOR(R, T, f) \
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KDC_LIB_FUNCTION T KDC_LIB_CALL \
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kdc_request_get_ ## f(R r) \
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{ \
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return r->f; \
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}
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#undef _KDC_REQUEST_SET_ACCESSOR
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#define _KDC_REQUEST_SET_ACCESSOR(R, T, f) \
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KDC_LIB_FUNCTION void KDC_LIB_CALL \
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kdc_request_set_ ## f(R r, T v) \
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{ \
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r->f = v; \
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}
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#undef _KDC_REQUEST_GET_ACCESSOR_PTR
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#define _KDC_REQUEST_GET_ACCESSOR_PTR(R, T, f) \
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KDC_LIB_FUNCTION const T KDC_LIB_CALL \
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kdc_request_get_ ## f(R r) \
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{ \
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return r->f; \
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}
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#undef _KDC_REQUEST_SET_ACCESSOR_PTR
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#define _KDC_REQUEST_SET_ACCESSOR_PTR(R, T, t, f) \
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KDC_LIB_FUNCTION krb5_error_code KDC_LIB_CALL \
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kdc_request_set_ ## f(R r, const T v) \
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{ \
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krb5_error_code ret; \
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T tmp; \
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\
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if (v == r->f) \
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return 0; \
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else if (v) { \
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ret = copy_##t(v, &tmp); \
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if (ret) \
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return ret; \
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} else \
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tmp = NULL; \
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\
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free_##t(r->f); \
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r->f = tmp; \
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\
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return 0; \
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}
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#undef _KDC_REQUEST_GET_ACCESSOR_STRUCT
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#define _KDC_REQUEST_GET_ACCESSOR_STRUCT(R, T, f) \
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KDC_LIB_FUNCTION const T * KDC_LIB_CALL \
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|
kdc_request_get_ ## f(R r) \
|
|
{ \
|
|
return &r->f; \
|
|
}
|
|
|
|
#undef _KDC_REQUEST_SET_ACCESSOR_STRUCT
|
|
#define _KDC_REQUEST_SET_ACCESSOR_STRUCT(R, T, t, f) \
|
|
KDC_LIB_FUNCTION krb5_error_code KDC_LIB_CALL \
|
|
kdc_request_set_ ## f(R r, const T *v) \
|
|
{ \
|
|
krb5_error_code ret; \
|
|
T tmp; \
|
|
\
|
|
if (v == NULL) \
|
|
return EINVAL; \
|
|
else if (v == &r->f) \
|
|
return 0; \
|
|
\
|
|
ret = copy_##t(v, &tmp); \
|
|
if (ret) \
|
|
return ret; \
|
|
\
|
|
free_##t(&r->f); \
|
|
r->f = tmp; \
|
|
\
|
|
return 0; \
|
|
}
|
|
|
|
static krb5_error_code
|
|
copy_string_ptr(const char *src, char **dst)
|
|
{
|
|
*dst = strdup(src);
|
|
if (*dst == NULL)
|
|
return ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
free_string_ptr(char *s)
|
|
{
|
|
free(s);
|
|
}
|
|
|
|
static krb5_error_code
|
|
copy_Principal_ptr(krb5_const_principal src, krb5_principal *dst)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_principal p;
|
|
|
|
*dst = NULL;
|
|
|
|
p = calloc(1, sizeof(*p));
|
|
if (p == NULL)
|
|
return ENOMEM;
|
|
|
|
ret = copy_Principal(src, p);
|
|
if (ret == 0)
|
|
*dst = p;
|
|
else
|
|
free(p);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
free_Principal_ptr(krb5_principal p)
|
|
{
|
|
if (p) {
|
|
free_Principal(p);
|
|
free(p);
|
|
}
|
|
}
|
|
|
|
static krb5_error_code
|
|
copy_pac(const struct krb5_pac_data *src, struct krb5_pac_data **dst)
|
|
{
|
|
/* FIXME use heim_copy() when it exists */
|
|
*dst = (krb5_pac)heim_retain((heim_object_t)src);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
free_pac(struct krb5_pac_data *o)
|
|
{
|
|
heim_release(o);
|
|
}
|
|
|
|
static krb5_error_code
|
|
copy_keyblock(const EncryptionKey *src, EncryptionKey *dst)
|
|
{
|
|
return copy_EncryptionKey(src, dst);
|
|
}
|
|
|
|
static void
|
|
free_keyblock(EncryptionKey *key)
|
|
{
|
|
krb5_free_keyblock_contents(NULL, key);
|
|
}
|
|
|
|
#undef HEIMDAL_KDC_KDC_ACCESSORS_H
|
|
#include "kdc-accessors.h"
|
|
|
|
#undef _KDC_REQUEST_GET_ACCESSOR
|
|
#undef _KDC_REQUEST_SET_ACCESSOR
|
|
|
|
#undef _KDC_REQUEST_GET_ACCESSOR_PTR
|
|
#undef _KDC_REQUEST_SET_ACCESSOR_PTR
|
|
#define _KDC_REQUEST_SET_ACCESSOR_PTR(R, T, t, f) \
|
|
void \
|
|
_kdc_request_set_ ## f ## _nocopy(R r, T *v) \
|
|
{ \
|
|
if (*v != r->f) { \
|
|
free_##t(r->f); \
|
|
r->f = *v; \
|
|
} \
|
|
*v = NULL; \
|
|
}
|
|
|
|
#undef _KDC_REQUEST_GET_ACCESSOR_STRUCT
|
|
#undef _KDC_REQUEST_SET_ACCESSOR_STRUCT
|
|
#define _KDC_REQUEST_SET_ACCESSOR_STRUCT(R, T, t, f) \
|
|
void \
|
|
_kdc_request_set_ ## f ## _nocopy(R r, T *v) \
|
|
{ \
|
|
if (v != &r->f) { \
|
|
free_##t(&r->f); \
|
|
r->f = *v; \
|
|
} \
|
|
memset(v, 0, sizeof(*v)); \
|
|
}
|
|
|
|
#undef HEIMDAL_KDC_KDC_ACCESSORS_H
|
|
#include "kdc-accessors.h"
|