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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
*/
/*
* Low level APIs are deprecated for public use, but still ok for internal use.
*/
#include "internal/deprecated.h"
#include <string.h>
#include <openssl/core.h>
#include <openssl/core_dispatch.h>
#include <openssl/core_names.h>
#include <openssl/params.h>
#include <openssl/err.h>
#include <openssl/pem.h> /* Functions for writing MSBLOB and PVK */
#include <openssl/dsa.h>
#include "internal/passphrase.h"
#include "crypto/rsa.h"
#include "prov/implementations.h"
#include "prov/bio.h"
#include "prov/provider_ctx.h"
#include "endecoder_local.h"
struct key2ms_ctx_st {
PROV_CTX *provctx;
int pvk_encr_level;
struct ossl_passphrase_data_st pwdata;
};
static int write_msblob(struct key2ms_ctx_st *ctx, OSSL_CORE_BIO *cout,
EVP_PKEY *pkey, int ispub)
{
BIO *out = ossl_bio_new_from_core_bio(ctx->provctx, cout);
int ret =
ispub ? i2b_PublicKey_bio(out, pkey) : i2b_PrivateKey_bio(out, pkey);
BIO_free(out);
return ret;
}
static int write_pvk(struct key2ms_ctx_st *ctx, OSSL_CORE_BIO *cout,
EVP_PKEY *pkey)
{
BIO *out = NULL;
int ret = 0;
OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(ctx->provctx);
out = ossl_bio_new_from_core_bio(ctx->provctx, cout);
ret = i2b_PVK_bio_ex(out, pkey, ctx->pvk_encr_level,
ossl_pw_pvk_password, &ctx->pwdata, libctx, NULL);
BIO_free(out);
return ret;
}
static OSSL_FUNC_encoder_freectx_fn key2ms_freectx;
static OSSL_FUNC_encoder_does_selection_fn key2ms_does_selection;
static struct key2ms_ctx_st *key2ms_newctx(void *provctx)
{
struct key2ms_ctx_st *ctx = OPENSSL_zalloc(sizeof(*ctx));
if (ctx != NULL) {
ctx->provctx = provctx;
/* This is the strongest encryption level */
ctx->pvk_encr_level = 2;
}
return ctx;
}
static void key2ms_freectx(void *vctx)
{
struct key2ms_ctx_st *ctx = vctx;
ossl_pw_clear_passphrase_data(&ctx->pwdata);
OPENSSL_free(ctx);
}
static const OSSL_PARAM *key2pvk_settable_ctx_params(ossl_unused void *provctx)
{
static const OSSL_PARAM settables[] = {
OSSL_PARAM_int(OSSL_ENCODER_PARAM_ENCRYPT_LEVEL, NULL),
OSSL_PARAM_END,
};
return settables;
}
static int key2pvk_set_ctx_params(void *vctx, const OSSL_PARAM params[])
{
struct key2ms_ctx_st *ctx = vctx;
const OSSL_PARAM *p;
p = OSSL_PARAM_locate_const(params, OSSL_ENCODER_PARAM_ENCRYPT_LEVEL);
if (p != NULL && !OSSL_PARAM_get_int(p, &ctx->pvk_encr_level))
return 0;
return 1;
}
static int key2ms_does_selection(void *vctx, int selection)
{
return (selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0;
}
/*
* The real EVP_PKEY_set1_TYPE() functions take a non-const key, while the key
* pointer in the encode function is a const pointer. We violate the constness
* knowingly, since we know that the key comes from the same provider, is never
* actually const, and the implied reference count change is safe.
*
* EVP_PKEY_assign() can't be used, because there's no way to clear the internal
* key using that function without freeing the existing internal key.
*/
typedef int evp_pkey_set1_fn(EVP_PKEY *, const void *key);
static int key2msblob_encode(void *vctx, const void *key, int selection,
OSSL_CORE_BIO *cout, evp_pkey_set1_fn *set1_key,
OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
{
struct key2ms_ctx_st *ctx = vctx;
int ispub = -1;
EVP_PKEY *pkey = NULL;
int ok = 0;
if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
ispub = 0;
else if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
ispub = 1;
else
return 0; /* Error */
if ((pkey = EVP_PKEY_new()) != NULL && set1_key(pkey, key))
ok = write_msblob(ctx, cout, pkey, ispub);
EVP_PKEY_free(pkey);
return ok;
}
static int key2pvk_encode(void *vctx, const void *key, int selection,
OSSL_CORE_BIO *cout, evp_pkey_set1_fn *set1_key,
OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
{
struct key2ms_ctx_st *ctx = vctx;
EVP_PKEY *pkey = NULL;
int ok = 0;
if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) == 0)
return 0; /* Error */
if ((pkey = EVP_PKEY_new()) != NULL && set1_key(pkey, key)
&& (pw_cb == NULL
|| ossl_pw_set_ossl_passphrase_cb(&ctx->pwdata, pw_cb, pw_cbarg)))
ok = write_pvk(ctx, cout, pkey);
EVP_PKEY_free(pkey);
return ok;
}
#define dsa_set1 (evp_pkey_set1_fn *)EVP_PKEY_set1_DSA
#define rsa_set1 (evp_pkey_set1_fn *)EVP_PKEY_set1_RSA
#define msblob_set_params
#define pvk_set_params \
{ OSSL_FUNC_ENCODER_SETTABLE_CTX_PARAMS, \
(void (*)(void))key2pvk_settable_ctx_params }, \
{ OSSL_FUNC_ENCODER_SET_CTX_PARAMS, \
(void (*)(void))key2pvk_set_ctx_params },
#define MAKE_MS_ENCODER(impl, output, type) \
static OSSL_FUNC_encoder_import_object_fn \
impl##2##output##_import_object; \
static OSSL_FUNC_encoder_free_object_fn impl##2##output##_free_object; \
static OSSL_FUNC_encoder_encode_fn impl##2##output##_encode; \
\
static void * \
impl##2##output##_import_object(void *ctx, int selection, \
const OSSL_PARAM params[]) \
{ \
return ossl_prov_import_key(ossl_##impl##_keymgmt_functions, \
ctx, selection, params); \
} \
static void impl##2##output##_free_object(void *key) \
{ \
ossl_prov_free_key(ossl_##impl##_keymgmt_functions, key); \
} \
static int impl##2##output##_encode(void *vctx, OSSL_CORE_BIO *cout, \
const void *key, \
const OSSL_PARAM key_abstract[], \
int selection, \
OSSL_PASSPHRASE_CALLBACK *cb, \
void *cbarg) \
{ \
/* We don't deal with abstract objects */ \
if (key_abstract != NULL) { \
ERR_raise(ERR_LIB_PROV, ERR_R_PASSED_INVALID_ARGUMENT); \
return 0; \
} \
return key2##output##_encode(vctx, key, selection, cout, type##_set1, \
cb, cbarg); \
} \
const OSSL_DISPATCH ossl_##impl##_to_##output##_encoder_functions[] = { \
{ OSSL_FUNC_ENCODER_NEWCTX, \
(void (*)(void))key2ms_newctx }, \
{ OSSL_FUNC_ENCODER_FREECTX, \
(void (*)(void))key2ms_freectx }, \
output##_set_params \
{ OSSL_FUNC_ENCODER_DOES_SELECTION, \
(void (*)(void))key2ms_does_selection }, \
{ OSSL_FUNC_ENCODER_IMPORT_OBJECT, \
(void (*)(void))impl##2##output##_import_object }, \
{ OSSL_FUNC_ENCODER_FREE_OBJECT, \
(void (*)(void))impl##2##output##_free_object }, \
{ OSSL_FUNC_ENCODER_ENCODE, \
(void (*)(void))impl##2##output##_encode }, \
{ 0, NULL } \
}
#ifndef OPENSSL_NO_DSA
MAKE_MS_ENCODER(dsa, pvk, dsa);
MAKE_MS_ENCODER(dsa, msblob, dsa);
#endif
MAKE_MS_ENCODER(rsa, pvk, rsa);
MAKE_MS_ENCODER(rsa, msblob, rsa);
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