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openssl/providers/implementations/encode_decode/decode_msblob2key.c

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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
*/
/*
* 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 <openssl/err.h>
#include "internal/passphrase.h"
#include "crypto/pem.h" /* For internal PVK and "blob" headers */
#include "crypto/rsa.h"
#include "prov/bio.h"
#include "prov/implementations.h"
#include "prov/endecoder_local.h"
struct msblob2key_ctx_st; /* Forward declaration */
typedef void *b2i_of_void_fn(const unsigned char **in, unsigned int bitlen,
int ispub);
typedef void adjust_key_fn(void *, struct msblob2key_ctx_st *ctx);
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) */
b2i_of_void_fn *read_private_key;
b2i_of_void_fn *read_public_key;
adjust_key_fn *adjust_key;
free_key_fn *free_key;
};
static OSSL_FUNC_decoder_freectx_fn msblob2key_freectx;
static OSSL_FUNC_decoder_decode_fn msblob2key_decode;
static OSSL_FUNC_decoder_export_object_fn msblob2key_export_object;
/*
* Context used for DER to key decoding.
*/
struct msblob2key_ctx_st {
PROV_CTX *provctx;
const struct keytype_desc_st *desc;
/* The selection that is passed to msblob2key_decode() */
int selection;
};
static struct msblob2key_ctx_st *
msblob2key_newctx(void *provctx, const struct keytype_desc_st *desc)
{
struct msblob2key_ctx_st *ctx = OPENSSL_zalloc(sizeof(*ctx));
if (ctx != NULL) {
ctx->provctx = provctx;
ctx->desc = desc;
}
return ctx;
}
static void msblob2key_freectx(void *vctx)
{
struct msblob2key_ctx_st *ctx = vctx;
OPENSSL_free(ctx);
}
static int msblob2key_does_selection(void *provctx, int selection)
{
if (selection == 0)
return 1;
if ((selection & (OSSL_KEYMGMT_SELECT_PRIVATE_KEY
| OSSL_KEYMGMT_SELECT_PUBLIC_KEY)) != 0)
return 1;
return 0;
}
static int msblob2key_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 msblob2key_ctx_st *ctx = vctx;
BIO *in = ossl_bio_new_from_core_bio(ctx->provctx, cin);
const unsigned char *p;
unsigned char hdr_buf[16], *buf = NULL;
unsigned int bitlen, magic, length;
int isdss = -1;
int ispub = -1;
void *key = NULL;
int ok = 0;
if (in == NULL)
return 0;
if (BIO_read(in, hdr_buf, 16) != 16) {
ERR_raise(ERR_LIB_PEM, PEM_R_KEYBLOB_TOO_SHORT);
goto next;
}
ERR_set_mark();
p = hdr_buf;
ok = ossl_do_blob_header(&p, 16, &magic, &bitlen, &isdss, &ispub) > 0;
ERR_pop_to_mark();
if (!ok)
goto next;
ctx->selection = selection;
ok = 0; /* Assume that we fail */
if ((isdss && ctx->desc->type != EVP_PKEY_DSA)
|| (!isdss && ctx->desc->type != EVP_PKEY_RSA))
goto next;
length = ossl_blob_length(bitlen, isdss, ispub);
if (length > BLOB_MAX_LENGTH) {
ERR_raise(ERR_LIB_PEM, PEM_R_HEADER_TOO_LONG);
goto next;
}
buf = OPENSSL_malloc(length);
if (buf == NULL)
goto end;
p = buf;
if (BIO_read(in, buf, length) != (int)length) {
ERR_raise(ERR_LIB_PEM, PEM_R_KEYBLOB_TOO_SHORT);
goto next;
}
if ((selection == 0
|| (selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
&& !ispub
&& ctx->desc->read_private_key != NULL) {
struct ossl_passphrase_data_st pwdata;
memset(&pwdata, 0, sizeof(pwdata));
if (!ossl_pw_set_ossl_passphrase_cb(&pwdata, pw_cb, pw_cbarg))
goto end;
p = buf;
key = ctx->desc->read_private_key(&p, bitlen, ispub);
if (selection != 0 && key == NULL)
goto next;
}
if (key == NULL && (selection == 0
|| (selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
&& ispub
&& ctx->desc->read_public_key != NULL) {
p = buf;
key = ctx->desc->read_public_key(&p, bitlen, ispub);
if (selection != 0 && key == NULL)
goto next;
}
if (key != NULL && ctx->desc->adjust_key != NULL)
ctx->desc->adjust_key(key, ctx);
next:
/*
* Indicated that we successfully decoded something, or not at all.
* Ending up "empty handed" is not an error.
*/
ok = 1;
/*
* We free resources here so it's not held up during the callback, because
* we know the process is recursive and the allocated chunks of memory
* add up.
*/
OPENSSL_free(buf);
BIO_free(in);
buf = NULL;
in = NULL;
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);
}
end:
BIO_free(in);
OPENSSL_free(buf);
ctx->desc->free_key(key);
return ok;
}
static int
msblob2key_export_object(void *vctx,
const void *reference, size_t reference_sz,
OSSL_CALLBACK *export_cb, void *export_cbarg)
{
struct msblob2key_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) {
int selection = ctx->selection;
if (selection == 0)
selection = OSSL_KEYMGMT_SELECT_ALL;
/* The contents of the reference is the address to our object */
keydata = *(void **)reference;
return export(keydata, selection, export_cb, export_cbarg);
}
return 0;
}
/* ---------------------------------------------------------------------- */
#define dsa_decode_private_key (b2i_of_void_fn *)ossl_b2i_DSA_after_header
#define dsa_decode_public_key (b2i_of_void_fn *)ossl_b2i_DSA_after_header
#define dsa_adjust NULL
#define dsa_free (void (*)(void *))DSA_free
/* ---------------------------------------------------------------------- */
#define rsa_decode_private_key (b2i_of_void_fn *)ossl_b2i_RSA_after_header
#define rsa_decode_public_key (b2i_of_void_fn *)ossl_b2i_RSA_after_header
static void rsa_adjust(void *key, struct msblob2key_ctx_st *ctx)
{
ossl_rsa_set0_libctx(key, PROV_LIBCTX_OF(ctx->provctx));
}
#define rsa_free (void (*)(void *))RSA_free
/* ---------------------------------------------------------------------- */
#define IMPLEMENT_MSBLOB(KEYTYPE, keytype) \
static const struct keytype_desc_st mstype##2##keytype##_desc = { \
EVP_PKEY_##KEYTYPE, #KEYTYPE, \
ossl_##keytype##_keymgmt_functions, \
keytype##_decode_private_key, \
keytype##_decode_public_key, \
keytype##_adjust, \
keytype##_free \
}; \
static OSSL_FUNC_decoder_newctx_fn msblob2##keytype##_newctx; \
static void *msblob2##keytype##_newctx(void *provctx) \
{ \
return msblob2key_newctx(provctx, &mstype##2##keytype##_desc); \
} \
const OSSL_DISPATCH \
ossl_msblob_to_##keytype##_decoder_functions[] = { \
{ OSSL_FUNC_DECODER_NEWCTX, \
(void (*)(void))msblob2##keytype##_newctx }, \
{ OSSL_FUNC_DECODER_FREECTX, \
(void (*)(void))msblob2key_freectx }, \
{ OSSL_FUNC_DECODER_DOES_SELECTION, \
(void (*)(void))msblob2key_does_selection }, \
{ OSSL_FUNC_DECODER_DECODE, \
(void (*)(void))msblob2key_decode }, \
{ OSSL_FUNC_DECODER_EXPORT_OBJECT, \
(void (*)(void))msblob2key_export_object }, \
OSSL_DISPATCH_END \
}
#ifndef OPENSSL_NO_DSA
IMPLEMENT_MSBLOB(DSA, dsa);
#endif
IMPLEMENT_MSBLOB(RSA, rsa);
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