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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 <string.h>
#include <openssl/core_dispatch.h>
#include <openssl/core_names.h>
#include <openssl/core_object.h>
#include <openssl/crypto.h>
#include <openssl/params.h>
#include <openssl/pem.h> /* For public PVK functions */
#include <openssl/x509.h>
#include "internal/pem.h" /* For internal PVK and "blob" headers */
#include "internal/passphrase.h"
#include "prov/bio.h"
#include "prov/implementations.h"
#include "endecoder_local.h"
#ifndef OPENSSL_NO_DSA
static EVP_PKEY *read_msblob(PROV_CTX *provctx, OSSL_CORE_BIO *cin, int *ispub)
{
BIO *in = bio_new_from_core_bio(provctx, cin);
EVP_PKEY *pkey = ossl_b2i_bio(in, ispub);
BIO_free(in);
return pkey;
}
# ifndef OPENSSL_NO_RC4
static EVP_PKEY *read_pvk(PROV_CTX *provctx, OSSL_CORE_BIO *cin,
OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
{
BIO *in = NULL;
EVP_PKEY *pkey = NULL;
struct ossl_passphrase_data_st pwdata;
memset(&pwdata, 0, sizeof(pwdata));
if (!ossl_pw_set_ossl_passphrase_cb(&pwdata, pw_cb, pw_cbarg))
return NULL;
in = bio_new_from_core_bio(provctx, cin);
pkey = b2i_PVK_bio(in, ossl_pw_pem_password, &pwdata);
BIO_free(in);
return pkey;
}
# endif
#endif
static OSSL_FUNC_decoder_freectx_fn ms2key_freectx;
static OSSL_FUNC_decoder_gettable_params_fn ms2key_gettable_params;
static OSSL_FUNC_decoder_get_params_fn msblob2key_get_params;
#ifndef OPENSSL_NO_RC4
static OSSL_FUNC_decoder_get_params_fn pvk2key_get_params;
#endif
static OSSL_FUNC_decoder_decode_fn msblob2key_decode;
#ifndef OPENSSL_NO_RC4
static OSSL_FUNC_decoder_decode_fn pvk2key_decode;
#endif
static OSSL_FUNC_decoder_export_object_fn ms2key_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 decoding.
*/
struct ms2key_ctx_st {
PROV_CTX *provctx;
const struct keytype_desc_st *desc;
};
static struct ms2key_ctx_st *
ms2key_newctx(void *provctx, const struct keytype_desc_st *desc)
{
struct ms2key_ctx_st *ctx = OPENSSL_zalloc(sizeof(*ctx));
if (ctx != NULL) {
ctx->provctx = provctx;
ctx->desc = desc;
}
return ctx;
}
static void ms2key_freectx(void *vctx)
{
struct ms2key_ctx_st *ctx = vctx;
OPENSSL_free(ctx);
}
static const OSSL_PARAM *ms2key_gettable_params(ossl_unused 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 msblob2key_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, "MSBLOB"))
return 0;
return 1;
}
#ifndef OPENSSL_NO_RC4
static int pvk2key_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, "PVK"))
return 0;
return 1;
}
#endif
static int ms2key_post(struct ms2key_ctx_st *ctx, EVP_PKEY *pkey,
OSSL_CALLBACK *data_cb, void *data_cbarg)
{
void *key = NULL;
int ok = 0;
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);
}
if (key != NULL) {
OSSL_PARAM params[4];
int object_type = OSSL_OBJECT_PKEY;
params[0] =
OSSL_PARAM_construct_int(OSSL_OBJECT_PARAM_TYPE, &object_type);
params[1] =
OSSL_PARAM_construct_utf8_string(OSSL_OBJECT_PARAM_DATA_TYPE,
(char *)ctx->desc->name, 0);
/* The address of the key becomes the octet string */
params[2] =
OSSL_PARAM_construct_octet_string(OSSL_OBJECT_PARAM_REFERENCE,
&key, sizeof(key));
params[3] = OSSL_PARAM_construct_end();
ok = data_cb(params, data_cbarg);
}
ctx->desc->free_key(key);
return ok;
}
static int msblob2key_decode(void *vctx, OSSL_CORE_BIO *cin,
OSSL_CALLBACK *data_cb, void *data_cbarg,
OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
{
struct ms2key_ctx_st *ctx = vctx;
int ispub = -1;
EVP_PKEY *pkey = read_msblob(ctx->provctx, cin, &ispub);
int ok = ms2key_post(ctx, pkey, data_cb, data_cbarg);
EVP_PKEY_free(pkey);
return ok;
}
#ifndef OPENSSL_NO_RC4
static int pvk2key_decode(void *vctx, OSSL_CORE_BIO *cin,
OSSL_CALLBACK *data_cb, void *data_cbarg,
OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
{
struct ms2key_ctx_st *ctx = vctx;
EVP_PKEY *pkey = read_pvk(ctx->provctx, cin, pw_cb, pw_cbarg);
int ok = ms2key_post(ctx, pkey, data_cb, data_cbarg);
EVP_PKEY_free(pkey);
return ok;
}
#endif
static int ms2key_export_object(void *vctx,
const void *reference, size_t reference_sz,
OSSL_CALLBACK *export_cb, void *export_cbarg)
{
struct ms2key_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_TYPE(KEYTYPEstr, KEYTYPE, keytype, extract, free) \
static const struct keytype_desc_st keytype##_desc; \
static OSSL_FUNC_decoder_newctx_fn ms2##keytype##_newctx; \
static void *ms2##keytype##_newctx(void *provctx) \
{ \
return ms2key_newctx(provctx, &keytype##_desc); \
} \
static const struct keytype_desc_st keytype##_desc = \
{ EVP_PKEY_##KEYTYPE, KEYTYPEstr, \
ossl_##keytype##_keymgmt_functions, \
(extract_key_fn *)extract, \
(free_key_fn *)free }
#define IMPLEMENT_MS(mstype, keytype) \
const OSSL_DISPATCH \
ossl_##mstype##_to_##keytype##_decoder_functions[] = { \
{ OSSL_FUNC_DECODER_NEWCTX, \
(void (*)(void))ms2##keytype##_newctx }, \
{ OSSL_FUNC_DECODER_FREECTX, \
(void (*)(void))ms2key_freectx }, \
{ OSSL_FUNC_DECODER_GETTABLE_PARAMS, \
(void (*)(void))ms2key_gettable_params }, \
{ OSSL_FUNC_DECODER_GET_PARAMS, \
(void (*)(void))mstype##2key_get_params }, \
{ OSSL_FUNC_DECODER_DECODE, \
(void (*)(void))mstype##2key_decode }, \
{ OSSL_FUNC_DECODER_EXPORT_OBJECT, \
(void (*)(void))ms2key_export_object }, \
{ 0, NULL } \
}
#ifndef OPENSSL_NO_DSA
IMPLEMENT_TYPE("DSA", DSA, dsa, EVP_PKEY_get1_DSA, DSA_free);
IMPLEMENT_MS(msblob, dsa);
# ifndef OPENSSL_NO_RC4
IMPLEMENT_MS(pvk, dsa);
# endif
#endif
IMPLEMENT_TYPE("RSA", RSA, rsa, EVP_PKEY_get1_RSA, RSA_free);
IMPLEMENT_MS(msblob, rsa);
#ifndef OPENSSL_NO_RC4
IMPLEMENT_MS(pvk, rsa);
#endif
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