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/*
* Copyright 2020-2025 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
*/
#include <openssl/core.h>
#include <openssl/core_dispatch.h>
#include <openssl/core_names.h>
#include <openssl/core_object.h>
#include <openssl/asn1.h>
#include <openssl/err.h>
#include <openssl/objects.h>
#include <openssl/pkcs12.h>
#include <openssl/x509.h>
#include <openssl/proverr.h>
#include "internal/asn1.h"
#include "internal/sizes.h"
#include "prov/bio.h"
#include "prov/decoders.h"
#include "prov/implementations.h"
#include "endecoder_local.h"
static OSSL_FUNC_decoder_newctx_fn epki2pki_newctx;
static OSSL_FUNC_decoder_freectx_fn epki2pki_freectx;
static OSSL_FUNC_decoder_decode_fn epki2pki_decode;
static OSSL_FUNC_decoder_settable_ctx_params_fn epki2pki_settable_ctx_params;
static OSSL_FUNC_decoder_set_ctx_params_fn epki2pki_set_ctx_params;
/*
* Context used for EncryptedPrivateKeyInfo to PrivateKeyInfo decoding.
*/
struct epki2pki_ctx_st {
PROV_CTX *provctx;
char propq[OSSL_MAX_PROPQUERY_SIZE];
};
static void *epki2pki_newctx(void *provctx)
{
struct epki2pki_ctx_st *ctx = OPENSSL_zalloc(sizeof(*ctx));
if (ctx != NULL)
ctx->provctx = provctx;
return ctx;
}
static void epki2pki_freectx(void *vctx)
{
struct epki2pki_ctx_st *ctx = vctx;
OPENSSL_free(ctx);
}
static const OSSL_PARAM *epki2pki_settable_ctx_params(ossl_unused void *provctx)
{
static const OSSL_PARAM settables[] = {
OSSL_PARAM_utf8_string(OSSL_DECODER_PARAM_PROPERTIES, NULL, 0),
OSSL_PARAM_END
};
return settables;
}
static int epki2pki_set_ctx_params(void *vctx, const OSSL_PARAM params[])
{
struct epki2pki_ctx_st *ctx = vctx;
const OSSL_PARAM *p;
char *str = ctx->propq;
p = OSSL_PARAM_locate_const(params, OSSL_DECODER_PARAM_PROPERTIES);
if (p != NULL && !OSSL_PARAM_get_utf8_string(p, &str, sizeof(ctx->propq)))
return 0;
return 1;
}
/*
* The selection parameter in epki2pki_decode() is not used by this function
* because it's not relevant just to decode EncryptedPrivateKeyInfo to
* PrivateKeyInfo.
*/
static int epki2pki_decode(void *vctx, OSSL_CORE_BIO *cin, int selection,
OSSL_CALLBACK *data_cb, void *data_cbarg,
OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
{
struct epki2pki_ctx_st *ctx = vctx;
BUF_MEM *mem = NULL;
unsigned char *der = NULL;
long der_len = 0;
BIO *in = ossl_bio_new_from_core_bio(ctx->provctx, cin);
int ok = 0;
if (in == NULL)
return 0;
ok = (asn1_d2i_read_bio(in, &mem) >= 0);
BIO_free(in);
/* We return "empty handed". This is not an error. */
if (!ok)
return 1;
der = (unsigned char *)mem->data;
der_len = (long)mem->length;
OPENSSL_free(mem);
ok = ossl_epki2pki_der_decode(der, der_len, selection, data_cb, data_cbarg,
pw_cb, pw_cbarg, PROV_LIBCTX_OF(ctx->provctx),
ctx->propq);
OPENSSL_free(der);
return ok;
}
int ossl_epki2pki_der_decode(unsigned char *der, long der_len, int selection,
OSSL_CALLBACK *data_cb, void *data_cbarg,
OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg,
OSSL_LIB_CTX *libctx, const char *propq)
{
const unsigned char *pder = der;
unsigned char *new_der = NULL;
X509_SIG *p8 = NULL;
PKCS8_PRIV_KEY_INFO *p8inf = NULL;
const X509_ALGOR *alg = NULL;
int ok = 1; /* Assume good */
ERR_set_mark();
if ((p8 = d2i_X509_SIG(NULL, &pder, der_len)) != NULL) {
char pbuf[1024];
size_t plen = 0;
ERR_clear_last_mark();
if (!pw_cb(pbuf, sizeof(pbuf), &plen, NULL, pw_cbarg)) {
ERR_raise(ERR_LIB_PROV, PROV_R_UNABLE_TO_GET_PASSPHRASE);
ok = 0;
} else {
const ASN1_OCTET_STRING *oct;
int new_der_len = 0;
X509_SIG_get0(p8, &alg, &oct);
if (!PKCS12_pbe_crypt_ex(alg, pbuf, plen,
oct->data, oct->length,
&new_der, &new_der_len, 0,
libctx, propq)) {
ok = 0;
} else {
der = new_der;
der_len = new_der_len;
}
alg = NULL;
}
X509_SIG_free(p8);
} else {
ERR_pop_to_mark();
}
ERR_set_mark();
pder = der;
p8inf = d2i_PKCS8_PRIV_KEY_INFO(NULL, &pder, der_len);
ERR_pop_to_mark();
if (p8inf != NULL && PKCS8_pkey_get0(NULL, NULL, NULL, &alg, p8inf)) {
/*
* We have something and recognised it as PrivateKeyInfo, so let's
* pass all the applicable data to the callback.
*/
char keytype[OSSL_MAX_NAME_SIZE];
OSSL_PARAM params[6], *p = params;
int objtype = OSSL_OBJECT_PKEY;
OBJ_obj2txt(keytype, sizeof(keytype), alg->algorithm, 0);
*p++ = OSSL_PARAM_construct_utf8_string(OSSL_OBJECT_PARAM_DATA_TYPE,
keytype, 0);
*p++ = OSSL_PARAM_construct_utf8_string(OSSL_OBJECT_PARAM_INPUT_TYPE,
"DER", 0);
*p++ = OSSL_PARAM_construct_utf8_string(OSSL_OBJECT_PARAM_DATA_STRUCTURE,
"PrivateKeyInfo", 0);
*p++ = OSSL_PARAM_construct_octet_string(OSSL_OBJECT_PARAM_DATA,
der, der_len);
*p++ = OSSL_PARAM_construct_int(OSSL_OBJECT_PARAM_TYPE, &objtype);
*p = OSSL_PARAM_construct_end();
ok = data_cb(params, data_cbarg);
}
PKCS8_PRIV_KEY_INFO_free(p8inf);
OPENSSL_free(new_der);
return ok;
}
const OSSL_DISPATCH ossl_EncryptedPrivateKeyInfo_der_to_der_decoder_functions[] = {
{ OSSL_FUNC_DECODER_NEWCTX, (void (*)(void))epki2pki_newctx },
{ OSSL_FUNC_DECODER_FREECTX, (void (*)(void))epki2pki_freectx },
{ OSSL_FUNC_DECODER_DECODE, (void (*)(void))epki2pki_decode },
{ OSSL_FUNC_DECODER_SETTABLE_CTX_PARAMS,
(void (*)(void))epki2pki_settable_ctx_params },
{ OSSL_FUNC_DECODER_SET_CTX_PARAMS,
(void (*)(void))epki2pki_set_ctx_params },
OSSL_DISPATCH_END
};
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