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/*
* Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/*
* This is a decoder that's completely internal to the 'file:' store
* implementation. Only code in file_store.c know about this one. Because
* of this close relationship, we can cut certain corners, such as making
* assumptions about the "provider context", which is currently simply the
* provider context that the file_store.c code operates within.
*
* All this does is to read DER from the input if it can, and passes it on
* to the data callback as an object abstraction, leaving it to the callback
* to figure out what it actually is.
*
* This MUST be made the last decoder in a chain, leaving it to other more
* specialized decoders to recognise and process their stuff first.
*/
#include <openssl/core_dispatch.h>
#include <openssl/core_names.h>
#include <openssl/core_object.h>
#include <openssl/bio.h>
#include <openssl/buffer.h>
#include <openssl/err.h>
#include <openssl/asn1err.h>
#include <openssl/params.h>
#include "internal/asn1.h"
#include "prov/bio.h"
#include "file_store_local.h"
/*
* newctx and freectx are not strictly necessary. However, the method creator,
* ossl_decoder_from_algorithm(), demands that they exist, so we make sure to
* oblige.
*/
static OSSL_FUNC_decoder_newctx_fn der2obj_newctx;
static OSSL_FUNC_decoder_freectx_fn der2obj_freectx;
static void *der2obj_newctx(void *provctx)
{
return provctx;
}
static void der2obj_freectx(void *vctx)
{
}
static OSSL_FUNC_decoder_gettable_params_fn der2obj_gettable_params;
static OSSL_FUNC_decoder_get_params_fn der2obj_get_params;
static OSSL_FUNC_decoder_decode_fn der2obj_decode;
static const OSSL_PARAM *der2obj_gettable_params(void *provctx)
{
static const OSSL_PARAM gettables[] = {
{ OSSL_DECODER_PARAM_INPUT_TYPE, OSSL_PARAM_UTF8_PTR, NULL, 0, 0 },
OSSL_PARAM_END,
};
return gettables;
}
static int der2obj_get_params(OSSL_PARAM params[])
{
OSSL_PARAM *p;
p = OSSL_PARAM_locate(params, OSSL_DECODER_PARAM_INPUT_TYPE);
if (p != NULL && !OSSL_PARAM_set_utf8_ptr(p, "DER"))
return 0;
return 1;
}
static int der2obj_decode(void *provctx, OSSL_CORE_BIO *cin, int selection,
OSSL_CALLBACK *data_cb, void *data_cbarg,
OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
{
/*
* We're called from file_store.c, so we know that OSSL_CORE_BIO is a
* BIO in this case.
*/
BIO *in = ossl_bio_new_from_core_bio(provctx, cin);
BUF_MEM *mem = NULL;
int ok;
if (in == NULL)
return 0;
ERR_set_mark();
ok = (asn1_d2i_read_bio(in, &mem) >= 0);
ERR_pop_to_mark();
if (!ok && mem != NULL) {
OPENSSL_free(mem->data);
OPENSSL_free(mem);
mem = NULL;
}
ok = 1;
if (mem != NULL) {
OSSL_PARAM params[3];
int object_type = OSSL_OBJECT_UNKNOWN;
params[0] =
OSSL_PARAM_construct_int(OSSL_OBJECT_PARAM_TYPE, &object_type);
params[1] =
OSSL_PARAM_construct_octet_string(OSSL_OBJECT_PARAM_DATA,
mem->data, mem->length);
params[2] = OSSL_PARAM_construct_end();
ok = data_cb(params, data_cbarg);
OPENSSL_free(mem->data);
OPENSSL_free(mem);
}
BIO_free(in);
return ok;
}
static const OSSL_DISPATCH der_to_obj_decoder_functions[] = {
{ OSSL_FUNC_DECODER_NEWCTX, (void (*)(void))der2obj_newctx },
{ OSSL_FUNC_DECODER_FREECTX, (void (*)(void))der2obj_freectx },
{ OSSL_FUNC_DECODER_GETTABLE_PARAMS,
(void (*)(void))der2obj_gettable_params },
{ OSSL_FUNC_DECODER_GET_PARAMS, (void (*)(void))der2obj_get_params },
{ OSSL_FUNC_DECODER_DECODE, (void (*)(void))der2obj_decode },
{ 0, NULL }
};
const OSSL_ALGORITHM ossl_der_to_obj_algorithm =
{ "obj", NULL, der_to_obj_decoder_functions };
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