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/*
* Copyright 2020 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
*/
/*
* low level APIs are deprecated for public use, but still ok for
* internal use.
*/
#include "internal/deprecated.h"
#include <openssl/core_dispatch.h>
#include <openssl/core_names.h>
#include <openssl/crypto.h>
#include <openssl/params.h>
#include <openssl/x509.h>
#include "prov/bio.h"
#include "prov/implementations.h"
#include "serializer_local.h"
static OSSL_FUNC_deserializer_newctx_fn der2rsa_newctx;
static OSSL_FUNC_deserializer_freectx_fn der2key_freectx;
static OSSL_FUNC_deserializer_gettable_params_fn der2key_gettable_params;
static OSSL_FUNC_deserializer_get_params_fn der2key_get_params;
static OSSL_FUNC_deserializer_deserialize_fn der2key_deserialize;
static OSSL_FUNC_deserializer_export_object_fn der2key_export_object;
typedef void *(extract_key_fn)(EVP_PKEY *);
typedef void (free_key_fn)(void *);
struct keytype_desc_st {
int type; /* EVP key type */
const char *name; /* Keytype */
const OSSL_DISPATCH *fns; /* Keymgmt (to pilfer functions from) */
/*
* These must be the correct EVP_PKEY_get1_{TYPE}() and {TYPE}_free()
* function for the key.
*/
extract_key_fn *extract_key;
free_key_fn *free_key;
};
/*
* Context used for DER to key deserialization.
*/
struct der2key_ctx_st {
PROV_CTX *provctx;
const struct keytype_desc_st *desc;
};
static struct der2key_ctx_st *
der2key_newctx(void *provctx, const struct keytype_desc_st *desc)
{
struct der2key_ctx_st *ctx = OPENSSL_zalloc(sizeof(*ctx));
if (ctx != NULL) {
ctx->provctx = provctx;
ctx->desc = desc;
}
return ctx;
}
static void der2key_freectx(void *vctx)
{
struct der2key_ctx_st *ctx = vctx;
OPENSSL_free(ctx);
}
static const OSSL_PARAM *der2key_gettable_params(void *provctx)
{
static const OSSL_PARAM gettables[] = {
{ OSSL_DESERIALIZER_PARAM_INPUT_TYPE, OSSL_PARAM_UTF8_PTR, NULL, 0, 0 },
OSSL_PARAM_END,
};
return gettables;
}
static int der2key_get_params(OSSL_PARAM params[])
{
OSSL_PARAM *p;
p = OSSL_PARAM_locate(params, OSSL_DESERIALIZER_PARAM_INPUT_TYPE);
if (p != NULL && !OSSL_PARAM_set_utf8_ptr(p, "DER"))
return 0;
return 1;
}
static int der2key_deserialize(void *vctx, OSSL_CORE_BIO *cin,
OSSL_CALLBACK *data_cb, void *data_cbarg,
OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
{
struct der2key_ctx_st *ctx = vctx;
void *libctx = PROV_LIBRARY_CONTEXT_OF(ctx->provctx);
unsigned char *der = NULL;
const unsigned char *derp;
long der_len = 0;
unsigned char *new_der = NULL;
long new_der_len;
EVP_PKEY *pkey = NULL;
void *key = NULL;
int ok = 0;
if (!ossl_prov_read_der(ctx->provctx, cin, &der, &der_len))
return 0;
/*
* Opportunistic attempt to decrypt. If it doesn't work, we try to
* decode our input unencrypted.
*/
if (ossl_prov_der_from_p8(&new_der, &new_der_len, der, der_len,
pw_cb, pw_cbarg)) {
OPENSSL_free(der);
der = new_der;
der_len = new_der_len;
}
derp = der;
pkey = d2i_PrivateKey_ex(ctx->desc->type, NULL, &derp, der_len,
libctx, NULL);
if (pkey == NULL) {
derp = der;
pkey = d2i_PUBKEY(NULL, &derp, der_len);
}
if (pkey == NULL) {
derp = der;
pkey = d2i_KeyParams(ctx->desc->type, NULL, &derp, der_len);
}
if (pkey != NULL) {
/*
* Tear out the low-level key pointer from the pkey,
* but only if it matches the expected key type.
*
* TODO(3.0): The check should be done with EVP_PKEY_is_a(), but
* as long as we still have #legacy internal keys, it's safer to
* use the type numbers in side the provider.
*/
if (EVP_PKEY_id(pkey) == ctx->desc->type)
key = ctx->desc->extract_key(pkey);
/*
* ctx->desc->extract_key() is expected to have incremented |key|'s
* reference count, so it should be safe to free |pkey| now.
*/
EVP_PKEY_free(pkey);
}
OPENSSL_free(der);
if (key != NULL) {
OSSL_PARAM params[3];
params[0] =
OSSL_PARAM_construct_utf8_string(OSSL_DESERIALIZER_PARAM_DATA_TYPE,
(char *)ctx->desc->name, 0);
/* The address of the key becomes the octet string */
params[1] =
OSSL_PARAM_construct_octet_string(OSSL_DESERIALIZER_PARAM_REFERENCE,
&key, sizeof(key));
params[2] = OSSL_PARAM_construct_end();
ok = data_cb(params, data_cbarg);
}
ctx->desc->free_key(key);
return ok;
}
static int der2key_export_object(void *vctx,
const void *reference, size_t reference_sz,
OSSL_CALLBACK *export_cb, void *export_cbarg)
{
struct der2key_ctx_st *ctx = vctx;
OSSL_FUNC_keymgmt_export_fn *export =
ossl_prov_get_keymgmt_export(ctx->desc->fns);
void *keydata;
if (reference_sz == sizeof(keydata) && export != NULL) {
/* The contents of the reference is the address to our object */
keydata = *(void **)reference;
return export(keydata, OSSL_KEYMGMT_SELECT_ALL,
export_cb, export_cbarg);
}
return 0;
}
#define IMPLEMENT_NEWCTX(KEYTYPEstr, KEYTYPE, keytype, extract, free) \
static const struct keytype_desc_st keytype##_desc = \
{ EVP_PKEY_##KEYTYPE, KEYTYPEstr, keytype##_keymgmt_functions, \
(extract_key_fn *)extract, \
(free_key_fn *)free }; \
static void *der2##keytype##_newctx(void *provctx) \
{ \
return der2key_newctx(provctx, &keytype##_desc); \
} \
const OSSL_DISPATCH der_to_##keytype##_deserializer_functions[] = { \
{ OSSL_FUNC_DESERIALIZER_NEWCTX, \
(void (*)(void))der2##keytype##_newctx }, \
{ OSSL_FUNC_DESERIALIZER_FREECTX, \
(void (*)(void))der2key_freectx }, \
{ OSSL_FUNC_DESERIALIZER_GETTABLE_PARAMS, \
(void (*)(void))der2key_gettable_params }, \
{ OSSL_FUNC_DESERIALIZER_GET_PARAMS, \
(void (*)(void))der2key_get_params }, \
{ OSSL_FUNC_DESERIALIZER_DESERIALIZE, \
(void (*)(void))der2key_deserialize }, \
{ OSSL_FUNC_DESERIALIZER_EXPORT_OBJECT, \
(void (*)(void))der2key_export_object }, \
{ 0, NULL } \
}
#ifndef OPENSSL_NO_DH
IMPLEMENT_NEWCTX("DH", DH, dh, EVP_PKEY_get1_DH, DH_free);
IMPLEMENT_NEWCTX("DHX", DHX, dhx, EVP_PKEY_get1_DH, DH_free);
#endif
#ifndef OPENSSL_NO_DSA
IMPLEMENT_NEWCTX("DSA", DSA, dsa, EVP_PKEY_get1_DSA, DSA_free);
#endif
#ifndef OPENSSL_NO_EC
IMPLEMENT_NEWCTX("EC", EC, ec, EVP_PKEY_get1_EC_KEY, EC_KEY_free);
IMPLEMENT_NEWCTX("X25519", X25519, x25519,
EVP_PKEY_get1_X25519, ecx_key_free);
IMPLEMENT_NEWCTX("X448", X448, x448,
EVP_PKEY_get1_X448, ecx_key_free);
IMPLEMENT_NEWCTX("ED25519", ED25519, ed25519,
EVP_PKEY_get1_ED25519, ecx_key_free);
IMPLEMENT_NEWCTX("ED448", ED448, ed448, EVP_PKEY_get1_ED448, ecx_key_free);
#endif
IMPLEMENT_NEWCTX("RSA", RSA, rsa, EVP_PKEY_get1_RSA, RSA_free);
IMPLEMENT_NEWCTX("RSA-PSS", RSA_PSS, rsapss, EVP_PKEY_get1_RSA, RSA_free);
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