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375 lines
9.1 KiB
C
375 lines
9.1 KiB
C
/*
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* Copyright 1995-2019 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include "internal/cryptlib.h"
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#include <openssl/asn1t.h>
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#include <openssl/x509.h>
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#include "internal/asn1_int.h"
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#include "internal/evp_int.h"
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#include "internal/x509_int.h"
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#include <openssl/rsa.h>
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#include <openssl/dsa.h>
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struct X509_pubkey_st {
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X509_ALGOR *algor;
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ASN1_BIT_STRING *public_key;
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EVP_PKEY *pkey;
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};
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static int x509_pubkey_decode(EVP_PKEY **pk, X509_PUBKEY *key);
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/* Minor tweak to operation: free up EVP_PKEY */
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static int pubkey_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
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void *exarg)
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{
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if (operation == ASN1_OP_FREE_POST) {
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X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
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EVP_PKEY_free(pubkey->pkey);
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} else if (operation == ASN1_OP_D2I_POST) {
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/* Attempt to decode public key and cache in pubkey structure. */
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X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
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EVP_PKEY_free(pubkey->pkey);
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pubkey->pkey = NULL;
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/*
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* Opportunistically decode the key but remove any non fatal errors
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* from the queue. Subsequent explicit attempts to decode/use the key
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* will return an appropriate error.
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*/
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ERR_set_mark();
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if (x509_pubkey_decode(&pubkey->pkey, pubkey) == -1)
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return 0;
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ERR_pop_to_mark();
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}
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return 1;
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}
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ASN1_SEQUENCE_cb(X509_PUBKEY, pubkey_cb) = {
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ASN1_SIMPLE(X509_PUBKEY, algor, X509_ALGOR),
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ASN1_SIMPLE(X509_PUBKEY, public_key, ASN1_BIT_STRING)
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} ASN1_SEQUENCE_END_cb(X509_PUBKEY, X509_PUBKEY)
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IMPLEMENT_ASN1_FUNCTIONS(X509_PUBKEY)
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int X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey)
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{
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X509_PUBKEY *pk = NULL;
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if (x == NULL)
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return 0;
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if ((pk = X509_PUBKEY_new()) == NULL)
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goto error;
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if (pkey->ameth) {
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if (pkey->ameth->pub_encode) {
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if (!pkey->ameth->pub_encode(pk, pkey)) {
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X509err(X509_F_X509_PUBKEY_SET,
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X509_R_PUBLIC_KEY_ENCODE_ERROR);
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goto error;
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}
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} else {
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X509err(X509_F_X509_PUBKEY_SET, X509_R_METHOD_NOT_SUPPORTED);
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goto error;
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}
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} else {
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X509err(X509_F_X509_PUBKEY_SET, X509_R_UNSUPPORTED_ALGORITHM);
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goto error;
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}
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X509_PUBKEY_free(*x);
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*x = pk;
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pk->pkey = pkey;
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EVP_PKEY_up_ref(pkey);
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return 1;
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error:
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X509_PUBKEY_free(pk);
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return 0;
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}
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/*
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* Attempt to decode a public key.
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* Returns 1 on success, 0 for a decode failure and -1 for a fatal
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* error e.g. malloc failure.
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*/
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static int x509_pubkey_decode(EVP_PKEY **ppkey, X509_PUBKEY *key)
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{
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EVP_PKEY *pkey = EVP_PKEY_new();
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if (pkey == NULL) {
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X509err(X509_F_X509_PUBKEY_DECODE, ERR_R_MALLOC_FAILURE);
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return -1;
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}
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if (!EVP_PKEY_set_type(pkey, OBJ_obj2nid(key->algor->algorithm))) {
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X509err(X509_F_X509_PUBKEY_DECODE, X509_R_UNSUPPORTED_ALGORITHM);
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goto error;
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}
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if (pkey->ameth->pub_decode) {
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/*
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* Treat any failure of pub_decode as a decode error. In
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* future we could have different return codes for decode
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* errors and fatal errors such as malloc failure.
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*/
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if (!pkey->ameth->pub_decode(pkey, key)) {
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X509err(X509_F_X509_PUBKEY_DECODE, X509_R_PUBLIC_KEY_DECODE_ERROR);
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goto error;
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}
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} else {
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X509err(X509_F_X509_PUBKEY_DECODE, X509_R_METHOD_NOT_SUPPORTED);
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goto error;
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}
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*ppkey = pkey;
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return 1;
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error:
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EVP_PKEY_free(pkey);
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return 0;
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}
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EVP_PKEY *X509_PUBKEY_get0(X509_PUBKEY *key)
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{
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EVP_PKEY *ret = NULL;
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if (key == NULL || key->public_key == NULL)
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return NULL;
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if (key->pkey != NULL)
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return key->pkey;
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/*
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* When the key ASN.1 is initially parsed an attempt is made to
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* decode the public key and cache the EVP_PKEY structure. If this
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* operation fails the cached value will be NULL. Parsing continues
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* to allow parsing of unknown key types or unsupported forms.
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* We repeat the decode operation so the appropriate errors are left
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* in the queue.
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*/
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x509_pubkey_decode(&ret, key);
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/* If decode doesn't fail something bad happened */
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if (ret != NULL) {
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X509err(X509_F_X509_PUBKEY_GET0, ERR_R_INTERNAL_ERROR);
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EVP_PKEY_free(ret);
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}
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return NULL;
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}
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EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
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{
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EVP_PKEY *ret = X509_PUBKEY_get0(key);
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if (ret != NULL)
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EVP_PKEY_up_ref(ret);
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return ret;
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}
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/*
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* Now two pseudo ASN1 routines that take an EVP_PKEY structure and encode or
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* decode as X509_PUBKEY
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*/
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EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp, long length)
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{
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X509_PUBKEY *xpk;
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EVP_PKEY *pktmp;
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const unsigned char *q;
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q = *pp;
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xpk = d2i_X509_PUBKEY(NULL, &q, length);
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if (!xpk)
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return NULL;
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pktmp = X509_PUBKEY_get(xpk);
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X509_PUBKEY_free(xpk);
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if (!pktmp)
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return NULL;
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*pp = q;
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if (a) {
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EVP_PKEY_free(*a);
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*a = pktmp;
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}
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return pktmp;
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}
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int i2d_PUBKEY(EVP_PKEY *a, unsigned char **pp)
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{
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X509_PUBKEY *xpk = NULL;
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int ret;
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if (!a)
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return 0;
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if (!X509_PUBKEY_set(&xpk, a))
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return -1;
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ret = i2d_X509_PUBKEY(xpk, pp);
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X509_PUBKEY_free(xpk);
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return ret;
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}
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/*
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* The following are equivalents but which return RSA and DSA keys
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*/
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#ifndef OPENSSL_NO_RSA
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RSA *d2i_RSA_PUBKEY(RSA **a, const unsigned char **pp, long length)
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{
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EVP_PKEY *pkey;
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RSA *key;
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const unsigned char *q;
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q = *pp;
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pkey = d2i_PUBKEY(NULL, &q, length);
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if (!pkey)
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return NULL;
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key = EVP_PKEY_get1_RSA(pkey);
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EVP_PKEY_free(pkey);
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if (!key)
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return NULL;
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*pp = q;
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if (a) {
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RSA_free(*a);
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*a = key;
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}
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return key;
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}
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int i2d_RSA_PUBKEY(RSA *a, unsigned char **pp)
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{
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EVP_PKEY *pktmp;
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int ret;
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if (!a)
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return 0;
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pktmp = EVP_PKEY_new();
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if (pktmp == NULL) {
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ASN1err(ASN1_F_I2D_RSA_PUBKEY, ERR_R_MALLOC_FAILURE);
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return -1;
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}
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EVP_PKEY_set1_RSA(pktmp, a);
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ret = i2d_PUBKEY(pktmp, pp);
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EVP_PKEY_free(pktmp);
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return ret;
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}
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#endif
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#ifndef OPENSSL_NO_DSA
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DSA *d2i_DSA_PUBKEY(DSA **a, const unsigned char **pp, long length)
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{
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EVP_PKEY *pkey;
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DSA *key;
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const unsigned char *q;
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q = *pp;
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pkey = d2i_PUBKEY(NULL, &q, length);
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if (!pkey)
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return NULL;
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key = EVP_PKEY_get1_DSA(pkey);
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EVP_PKEY_free(pkey);
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if (!key)
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return NULL;
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*pp = q;
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if (a) {
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DSA_free(*a);
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*a = key;
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}
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return key;
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}
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int i2d_DSA_PUBKEY(DSA *a, unsigned char **pp)
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{
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EVP_PKEY *pktmp;
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int ret;
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if (!a)
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return 0;
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pktmp = EVP_PKEY_new();
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if (pktmp == NULL) {
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ASN1err(ASN1_F_I2D_DSA_PUBKEY, ERR_R_MALLOC_FAILURE);
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return -1;
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}
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EVP_PKEY_set1_DSA(pktmp, a);
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ret = i2d_PUBKEY(pktmp, pp);
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EVP_PKEY_free(pktmp);
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return ret;
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}
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#endif
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#ifndef OPENSSL_NO_EC
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EC_KEY *d2i_EC_PUBKEY(EC_KEY **a, const unsigned char **pp, long length)
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{
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EVP_PKEY *pkey;
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EC_KEY *key;
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const unsigned char *q;
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q = *pp;
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pkey = d2i_PUBKEY(NULL, &q, length);
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if (!pkey)
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return NULL;
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key = EVP_PKEY_get1_EC_KEY(pkey);
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EVP_PKEY_free(pkey);
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if (!key)
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return NULL;
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*pp = q;
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if (a) {
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EC_KEY_free(*a);
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*a = key;
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}
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return key;
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}
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int i2d_EC_PUBKEY(EC_KEY *a, unsigned char **pp)
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{
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EVP_PKEY *pktmp;
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int ret;
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if (!a)
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return 0;
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if ((pktmp = EVP_PKEY_new()) == NULL) {
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ASN1err(ASN1_F_I2D_EC_PUBKEY, ERR_R_MALLOC_FAILURE);
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return -1;
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}
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EVP_PKEY_set1_EC_KEY(pktmp, a);
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ret = i2d_PUBKEY(pktmp, pp);
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EVP_PKEY_free(pktmp);
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return ret;
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}
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#endif
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int X509_PUBKEY_set0_param(X509_PUBKEY *pub, ASN1_OBJECT *aobj,
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int ptype, void *pval,
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unsigned char *penc, int penclen)
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{
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if (!X509_ALGOR_set0(pub->algor, aobj, ptype, pval))
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return 0;
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if (penc) {
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OPENSSL_free(pub->public_key->data);
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pub->public_key->data = penc;
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pub->public_key->length = penclen;
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/* Set number of unused bits to zero */
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pub->public_key->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
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pub->public_key->flags |= ASN1_STRING_FLAG_BITS_LEFT;
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}
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return 1;
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}
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int X509_PUBKEY_get0_param(ASN1_OBJECT **ppkalg,
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const unsigned char **pk, int *ppklen,
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X509_ALGOR **pa, X509_PUBKEY *pub)
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{
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if (ppkalg)
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*ppkalg = pub->algor->algorithm;
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if (pk) {
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*pk = pub->public_key->data;
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*ppklen = pub->public_key->length;
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}
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if (pa)
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*pa = pub->algor;
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return 1;
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}
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ASN1_BIT_STRING *X509_get0_pubkey_bitstr(const X509 *x)
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{
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if (x == NULL)
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return NULL;
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return x->cert_info.key->public_key;
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}
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