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/*
* Copyright 1995-2020 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
*/
/*
* DSA low level APIs are deprecated for public use, but still ok for
* internal use.
*/
#include "internal/deprecated.h"
#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/x509.h>
#include "crypto/asn1.h"
#include "crypto/evp.h"
#include "crypto/x509.h"
#include <openssl/rsa.h>
#include <openssl/dsa.h>
#include <openssl/encoder.h>
#include "internal/provider.h"
struct X509_pubkey_st {
X509_ALGOR *algor;
ASN1_BIT_STRING *public_key;
EVP_PKEY *pkey;
/* extra data for the callback, used by d2i_PUBKEY_ex */
OSSL_LIB_CTX *libctx;
const char *propq;
};
static int x509_pubkey_decode(EVP_PKEY **pk, const X509_PUBKEY *key);
/* Minor tweak to operation: free up EVP_PKEY */
static int pubkey_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
void *exarg)
{
X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
if (operation == ASN1_OP_FREE_POST) {
EVP_PKEY_free(pubkey->pkey);
} else if (operation == ASN1_OP_D2I_POST) {
/* Attempt to decode public key and cache in pubkey structure. */
EVP_PKEY_free(pubkey->pkey);
pubkey->pkey = NULL;
/*
* Opportunistically decode the key but remove any non fatal errors
* from the queue. Subsequent explicit attempts to decode/use the key
* will return an appropriate error.
*/
ERR_set_mark();
if (x509_pubkey_decode(&pubkey->pkey, pubkey) == -1) {
ERR_clear_last_mark();
return 0;
}
ERR_pop_to_mark();
}
return 1;
}
ASN1_SEQUENCE_cb(X509_PUBKEY, pubkey_cb) = {
ASN1_SIMPLE(X509_PUBKEY, algor, X509_ALGOR),
ASN1_SIMPLE(X509_PUBKEY, public_key, ASN1_BIT_STRING)
} ASN1_SEQUENCE_END_cb(X509_PUBKEY, X509_PUBKEY)
IMPLEMENT_ASN1_FUNCTIONS(X509_PUBKEY)
IMPLEMENT_ASN1_DUP_FUNCTION(X509_PUBKEY)
/* TODO should better be called X509_PUBKEY_set1 */
int X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey)
{
X509_PUBKEY *pk = NULL;
if (x == NULL)
return 0;
if (pkey == NULL)
goto unsupported;
if (pkey->ameth != NULL) {
if ((pk = X509_PUBKEY_new()) == NULL) {
X509err(X509_F_X509_PUBKEY_SET, ERR_R_MALLOC_FAILURE);
goto error;
}
if (pkey->ameth->pub_encode != NULL) {
if (!pkey->ameth->pub_encode(pk, pkey)) {
X509err(X509_F_X509_PUBKEY_SET,
X509_R_PUBLIC_KEY_ENCODE_ERROR);
goto error;
}
} else {
X509err(X509_F_X509_PUBKEY_SET, X509_R_METHOD_NOT_SUPPORTED);
goto error;
}
} else if (evp_pkey_is_provided(pkey)) {
const OSSL_PROVIDER *pkprov = EVP_KEYMGMT_provider(pkey->keymgmt);
OSSL_LIB_CTX *libctx = ossl_provider_libctx(pkprov);
unsigned char *der = NULL;
size_t derlen = 0;
int selection = (OSSL_KEYMGMT_SELECT_PUBLIC_KEY
| OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS);
OSSL_ENCODER_CTX *ectx =
OSSL_ENCODER_CTX_new_by_EVP_PKEY(pkey, "DER", selection,
libctx, NULL);
if (OSSL_ENCODER_to_data(ectx, &der, &derlen)) {
const unsigned char *pder = der;
pk = d2i_X509_PUBKEY(NULL, &pder, (long)derlen);
}
OSSL_ENCODER_CTX_free(ectx);
OPENSSL_free(der);
}
if (pk == NULL)
goto unsupported;
X509_PUBKEY_free(*x);
if (!EVP_PKEY_up_ref(pkey)) {
X509err(X509_F_X509_PUBKEY_SET, ERR_R_INTERNAL_ERROR);
goto error;
}
*x = pk;
/*
* pk->pkey is NULL when using the legacy routine, but is non-NULL when
* going through the encoder, and for all intents and purposes, it's
* a perfect copy of |pkey|, just not the same instance. In that case,
* we could simply return early, right here.
* However, in the interest of being cautious leaning on paranoia, some
* application might very well depend on the passed |pkey| being used
* and none other, so we spend a few more cycles throwing away the newly
* created |pk->pkey| and replace it with |pkey|.
* TODO(3.0) Investigate if it's safe to change to simply return here
* if |pk->pkey != NULL|.
*/
if (pk->pkey != NULL)
EVP_PKEY_free(pk->pkey);
pk->pkey = pkey;
return 1;
unsupported:
X509err(X509_F_X509_PUBKEY_SET, X509_R_UNSUPPORTED_ALGORITHM);
error:
X509_PUBKEY_free(pk);
return 0;
}
/*
* Attempt to decode a public key.
* Returns 1 on success, 0 for a decode failure and -1 for a fatal
* error e.g. malloc failure.
*/
static int x509_pubkey_decode(EVP_PKEY **ppkey, const X509_PUBKEY *key)
{
EVP_PKEY *pkey = EVP_PKEY_new();
if (pkey == NULL) {
X509err(X509_F_X509_PUBKEY_DECODE, ERR_R_MALLOC_FAILURE);
return -1;
}
if (!EVP_PKEY_set_type(pkey, OBJ_obj2nid(key->algor->algorithm))) {
X509err(X509_F_X509_PUBKEY_DECODE, X509_R_UNSUPPORTED_ALGORITHM);
goto error;
}
if (pkey->ameth->pub_decode) {
/*
* Treat any failure of pub_decode as a decode error. In
* future we could have different return codes for decode
* errors and fatal errors such as malloc failure.
*/
if (!pkey->ameth->pub_decode(pkey, key))
goto error;
} else {
X509err(X509_F_X509_PUBKEY_DECODE, X509_R_METHOD_NOT_SUPPORTED);
goto error;
}
*ppkey = pkey;
return 1;
error:
EVP_PKEY_free(pkey);
return 0;
}
EVP_PKEY *X509_PUBKEY_get0(const X509_PUBKEY *key)
{
EVP_PKEY *ret = NULL;
if (key == NULL || key->public_key == NULL)
return NULL;
if (key->pkey != NULL)
return key->pkey;
/*
* When the key ASN.1 is initially parsed an attempt is made to
* decode the public key and cache the EVP_PKEY structure. If this
* operation fails the cached value will be NULL. Parsing continues
* to allow parsing of unknown key types or unsupported forms.
* We repeat the decode operation so the appropriate errors are left
* in the queue.
*/
x509_pubkey_decode(&ret, key);
/* If decode doesn't fail something bad happened */
if (ret != NULL) {
X509err(X509_F_X509_PUBKEY_GET0, ERR_R_INTERNAL_ERROR);
EVP_PKEY_free(ret);
}
return NULL;
}
EVP_PKEY *X509_PUBKEY_get(const X509_PUBKEY *key)
{
EVP_PKEY *ret = X509_PUBKEY_get0(key);
if (ret != NULL && !EVP_PKEY_up_ref(ret)) {
X509err(X509_F_X509_PUBKEY_GET, ERR_R_INTERNAL_ERROR);
ret = NULL;
}
return ret;
}
/*
* Now three pseudo ASN1 routines that take an EVP_PKEY structure and encode
* or decode as X509_PUBKEY
*/
EVP_PKEY *d2i_PUBKEY_ex(EVP_PKEY **a, const unsigned char **pp, long length,
OSSL_LIB_CTX *libctx, const char *propq)
{
X509_PUBKEY *xpk, *xpk2 = NULL, **pxpk = NULL;
EVP_PKEY *pktmp = NULL;
const unsigned char *q;
q = *pp;
/*
* If libctx or propq are non-NULL, we take advantage of the reuse
* feature. It's not generally recommended, but is safe enough for
* newly created structures.
*/
if
|