boringssl/crypto/x509/x_pubkey.c
Brian Smith dc6c1b8381 Fix build when using Visual Studio 2015 Update 1.
Many of the compatibility issues are described at
https://msdn.microsoft.com/en-us/library/mt612856.aspx. The macros
that suppressed warnings on a per-function basis no longer work in
Update 1, so replace them with #pragmas. Update 1 warns when |size_t|
arguments to |printf| are casted, so stop doing that casting.
Unfortunately, this requires an ugly hack to continue working in
MSVC 2013 as MSVC 2013 doesn't support "%zu". Finally, Update 1 has new
warnings, some of which need to be suppressed.

---

Updated by davidben to give up on suppressing warnings in crypto/x509 and
crypto/x509v3 as those directories aren't changed much from upstream. In each
of these cases, upstream opted just blindly initialize the variable, so do the
same. Also switch C4265 to level 4, per Microsoft's recommendation and work
around a bug in limits.h that happens to get fixed by Google include order
style.

(limits.h is sensitive to whether corecrt.h, pulled in by stddef.h and some
other headers, is included before it. The reason it affected just one file is
we often put the file's header first, which means base.h is pulling in
stddef.h. Relying on this is ugly, but it's no worse than what everything else
is doing and this doesn't seem worth making something as tame as limits.h so
messy to use.)

Change-Id: I02d1f935356899f424d3525d03eca401bfa3e6cd
Reviewed-on: https://boringssl-review.googlesource.com/7480
Reviewed-by: David Benjamin <davidben@google.com>
2016-03-25 21:39:52 +00:00

367 lines
10 KiB
C

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.] */
#include <openssl/x509.h>
#include <limits.h>
#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#include <openssl/bytestring.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/mem.h>
#include <openssl/obj.h>
#include <openssl/thread.h>
#include "../internal.h"
/* Minor tweak to operation: free up EVP_PKEY */
static int pubkey_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
void *exarg)
{
if (operation == ASN1_OP_FREE_POST) {
X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
EVP_PKEY_free(pubkey->pkey);
}
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)
int X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey)
{
X509_PUBKEY *pk = NULL;
uint8_t *spki = NULL;
size_t spki_len;
if (x == NULL)
return (0);
CBB cbb;
if (!CBB_init(&cbb, 0) ||
!EVP_marshal_public_key(&cbb, pkey) ||
!CBB_finish(&cbb, &spki, &spki_len) ||
spki_len > LONG_MAX) {
CBB_cleanup(&cbb);
OPENSSL_PUT_ERROR(X509, X509_R_PUBLIC_KEY_ENCODE_ERROR);
goto error;
}
const uint8_t *p = spki;
pk = d2i_X509_PUBKEY(NULL, &p, (long)spki_len);
if (pk == NULL || p != spki + spki_len) {
OPENSSL_PUT_ERROR(X509, X509_R_PUBLIC_KEY_DECODE_ERROR);
goto error;
}
OPENSSL_free(spki);
X509_PUBKEY_free(*x);
*x = pk;
return 1;
error:
X509_PUBKEY_free(pk);
OPENSSL_free(spki);
return 0;
}
/* g_pubkey_lock is used to protect the initialisation of the |pkey| member of
* |X509_PUBKEY| objects. Really |X509_PUBKEY| should have a |CRYPTO_once_t|
* inside it for this, but |CRYPTO_once_t| is private and |X509_PUBKEY| is
* not. */
static struct CRYPTO_STATIC_MUTEX g_pubkey_lock = CRYPTO_STATIC_MUTEX_INIT;
EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
{
EVP_PKEY *ret = NULL;
uint8_t *spki = NULL;
if (key == NULL)
goto error;
CRYPTO_STATIC_MUTEX_lock_read(&g_pubkey_lock);
if (key->pkey != NULL) {
CRYPTO_STATIC_MUTEX_unlock(&g_pubkey_lock);
return EVP_PKEY_up_ref(key->pkey);
}
CRYPTO_STATIC_MUTEX_unlock(&g_pubkey_lock);
/* Re-encode the |X509_PUBKEY| to DER and parse it. */
int spki_len = i2d_X509_PUBKEY(key, &spki);
if (spki_len < 0) {
goto error;
}
CBS cbs;
CBS_init(&cbs, spki, (size_t)spki_len);
ret = EVP_parse_public_key(&cbs);
if (ret == NULL || CBS_len(&cbs) != 0) {
OPENSSL_PUT_ERROR(X509, X509_R_PUBLIC_KEY_DECODE_ERROR);
goto error;
}
/* Check to see if another thread set key->pkey first */
CRYPTO_STATIC_MUTEX_lock_write(&g_pubkey_lock);
if (key->pkey) {
CRYPTO_STATIC_MUTEX_unlock(&g_pubkey_lock);
EVP_PKEY_free(ret);
ret = key->pkey;
} else {
key->pkey = ret;
CRYPTO_STATIC_MUTEX_unlock(&g_pubkey_lock);
}
OPENSSL_free(spki);
return EVP_PKEY_up_ref(ret);
error:
OPENSSL_free(spki);
EVP_PKEY_free(ret);
return NULL;
}
/*
* Now two pseudo ASN1 routines that take an EVP_PKEY structure and encode or
* decode as X509_PUBKEY
*/
EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp, long length)
{
X509_PUBKEY *xpk;
EVP_PKEY *pktmp;
xpk = d2i_X509_PUBKEY(NULL, pp, length);
if (!xpk)
return NULL;
pktmp = X509_PUBKEY_get(xpk);
X509_PUBKEY_free(xpk);
if (!pktmp)
return NULL;
if (a) {
EVP_PKEY_free(*a);
*a = pktmp;
}
return pktmp;
}
int i2d_PUBKEY(const EVP_PKEY *a, unsigned char **pp)
{
X509_PUBKEY *xpk = NULL;
int ret;
if (!a)
return 0;
if (!X509_PUBKEY_set(&xpk, (EVP_PKEY *)a))
return 0;
ret = i2d_X509_PUBKEY(xpk, pp);
X509_PUBKEY_free(xpk);
return ret;
}
/*
* The following are equivalents but which return RSA and DSA keys
*/
RSA *d2i_RSA_PUBKEY(RSA **a, const unsigned char **pp, long length)
{
EVP_PKEY *pkey;
RSA *key;
const unsigned char *q;
q = *pp;
pkey = d2i_PUBKEY(NULL, &q, length);
if (!pkey)
return NULL;
key = EVP_PKEY_get1_RSA(pkey);
EVP_PKEY_free(pkey);
if (!key)
return NULL;
*pp = q;
if (a) {
RSA_free(*a);
*a = key;
}
return key;
}
int i2d_RSA_PUBKEY(const RSA *a, unsigned char **pp)
{
EVP_PKEY *pktmp;
int ret;
if (!a)
return 0;
pktmp = EVP_PKEY_new();
if (!pktmp) {
OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
return 0;
}
EVP_PKEY_set1_RSA(pktmp, (RSA *)a);
ret = i2d_PUBKEY(pktmp, pp);
EVP_PKEY_free(pktmp);
return ret;
}
#ifndef OPENSSL_NO_DSA
DSA *d2i_DSA_PUBKEY(DSA **a, const unsigned char **pp, long length)
{
EVP_PKEY *pkey;
DSA *key;
const unsigned char *q;
q = *pp;
pkey = d2i_PUBKEY(NULL, &q, length);
if (!pkey)
return NULL;
key = EVP_PKEY_get1_DSA(pkey);
EVP_PKEY_free(pkey);
if (!key)
return NULL;
*pp = q;
if (a) {
DSA_free(*a);
*a = key;
}
return key;
}
int i2d_DSA_PUBKEY(const DSA *a, unsigned char **pp)
{
EVP_PKEY *pktmp;
int ret;
if (!a)
return 0;
pktmp = EVP_PKEY_new();
if (!pktmp) {
OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
return 0;
}
EVP_PKEY_set1_DSA(pktmp, (DSA *)a);
ret = i2d_PUBKEY(pktmp, pp);
EVP_PKEY_free(pktmp);
return ret;
}
#endif
EC_KEY *d2i_EC_PUBKEY(EC_KEY **a, const unsigned char **pp, long length)
{
EVP_PKEY *pkey;
EC_KEY *key;
const unsigned char *q;
q = *pp;
pkey = d2i_PUBKEY(NULL, &q, length);
if (!pkey)
return (NULL);
key = EVP_PKEY_get1_EC_KEY(pkey);
EVP_PKEY_free(pkey);
if (!key)
return (NULL);
*pp = q;
if (a) {
EC_KEY_free(*a);
*a = key;
}
return (key);
}
int i2d_EC_PUBKEY(const EC_KEY *a, unsigned char **pp)
{
EVP_PKEY *pktmp;
int ret;
if (!a)
return (0);
if ((pktmp = EVP_PKEY_new()) == NULL) {
OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
return (0);
}
EVP_PKEY_set1_EC_KEY(pktmp, (EC_KEY *)a);
ret = i2d_PUBKEY(pktmp, pp);
EVP_PKEY_free(pktmp);
return (ret);
}
int X509_PUBKEY_set0_param(X509_PUBKEY *pub, const ASN1_OBJECT *aobj,
int ptype, void *pval,
unsigned char *penc, int penclen)
{
if (!X509_ALGOR_set0(pub->algor, aobj, ptype, pval))
return 0;
if (penc) {
if (pub->public_key->data)
OPENSSL_free(pub->public_key->data);
pub->public_key->data = penc;
pub->public_key->length = penclen;
/* Set number of unused bits to zero */
pub->public_key->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
pub->public_key->flags |= ASN1_STRING_FLAG_BITS_LEFT;
}
return 1;
}
int X509_PUBKEY_get0_param(ASN1_OBJECT **ppkalg,
const unsigned char **pk, int *ppklen,
X509_ALGOR **pa, X509_PUBKEY *pub)
{
if (ppkalg)
*ppkalg = pub->algor->algorithm;
if (pk) {
*pk = pub->public_key->data;
*ppklen = pub->public_key->length;
}
if (pa)
*pa = pub->algor;
return 1;
}