7cc4b7a9e6
Add some notes about the KDC plugin API contract, and require plugins to explicitly indicate which version of the API they support (remove the macro alias for the current version).
298 lines
7.9 KiB
C
298 lines
7.9 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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* 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_8,
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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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hdb_entry_ex *client;
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hdb_entry_ex *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, context,
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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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hdb_entry_ex *client,
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hdb_entry_ex *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->entry.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.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_principal client_principal;
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krb5_principal delegated_proxy_principal;
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hdb_entry_ex *client;
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hdb_entry_ex *server;
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hdb_entry_ex *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, context,
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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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const krb5_principal client_principal,
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const krb5_principal delegated_proxy_principal,
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hdb_entry_ex *client,
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hdb_entry_ex *server,
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hdb_entry_ex *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.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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