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/*
* Copyright (c) 2019 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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.
*/
#include "kdc_locl.h"
#include "token_validator_plugin.h"
struct plctx {
const char *realm;
const char *token_kind;
krb5_data *token;
const char * const *audiences;
size_t naudiences;
krb5_boolean result;
krb5_principal actual_principal;
krb5_times token_times;
};
static krb5_error_code KRB5_LIB_CALL
plcallback(krb5_context context, const void *plug, void *plugctx, void *userctx)
{
const krb5plugin_token_validator_ftable *validator = plug;
krb5_error_code ret;
struct plctx *plctx = userctx;
ret = validator->validate(plugctx, context, plctx->realm,
plctx->token_kind, plctx->token,
plctx->audiences, plctx->naudiences,
&plctx->result, &plctx->actual_principal,
&plctx->token_times);
if (ret) {
krb5_free_principal(context, plctx->actual_principal);
plctx->actual_principal = NULL;
}
return ret;
}
static const char *plugin_deps[] = { "krb5", NULL };
static struct heim_plugin_data token_validator_data = {
"kdc",
KDC_PLUGIN_BEARER,
1,
plugin_deps,
krb5_get_instance
};
/*
* Invoke a plugin to validate a JWT/SAML/OIDC token and partially-evaluate
* access control.
*/
KDC_LIB_FUNCTION krb5_error_code KDC_LIB_CALL
kdc_validate_token(krb5_context context,
const char *realm,
const char *token_kind,
krb5_data *token,
const char * const *audiences,
size_t naudiences,
krb5_principal *actual_principal,
krb5_times *token_times)
{
krb5_error_code ret;
struct plctx ctx;
memset(&ctx, 0, sizeof(ctx));
ctx.realm = realm;
ctx.token_kind = token_kind;
ctx.token = token;
ctx.audiences = audiences;
ctx.naudiences = naudiences;
ctx.result = FALSE;
ctx.actual_principal = NULL;
krb5_clear_error_message(context);
ret = _krb5_plugin_run_f(context, &token_validator_data, 0, &ctx,
plcallback);
if (ret == 0 && ctx.result && actual_principal) {
*actual_principal = ctx.actual_principal;
ctx.actual_principal = NULL;
}
if (token_times)
*token_times = ctx.token_times;
krb5_free_principal(context, ctx.actual_principal);
if (ret)
krb5_prepend_error_message(context, ret, "bearer token validation "
"failed: ");
else if (!ctx.result)
krb5_set_error_message(context, ret = EACCES,
"bearer token validation failed");
return ret;
}
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