/*
* Copyright (C) 2013-2015 Marc Hoersken <info@marc-hoersken.de>
* All rights reserved.
*
* Redistribution and use in source and binary forms,
* with or without modification, are permitted provided
* that the following conditions are met:
*
* Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
*
* 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.
*
* Neither the name of the copyright holder nor the names
* of any other contributors may be used to endorse or
* promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "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 COPYRIGHT OWNER 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.
*/
#include "libssh2_priv.h"
#ifdef LIBSSH2_WINCNG /* compile only if we build with wincng */
/* required for cross-compilation against the w64 mingw-runtime package */
#if defined(_WIN32_WINNT) && (_WIN32_WINNT < 0x0600)
#undef _WIN32_WINNT
#endif
#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x0600
#endif
/* specify the required libraries for dependencies using MSVC */
#ifdef _MSC_VER
#pragma comment(lib, "bcrypt.lib")
#ifdef HAVE_LIBCRYPT32
#pragma comment(lib, "crypt32.lib")
#endif
#endif
#include <windows.h>
#include <bcrypt.h>
#include <math.h>
#include "misc.h"
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_LIBCRYPT32
#include <wincrypt.h>
#endif
#define PEM_RSA_HEADER "-----BEGIN RSA PRIVATE KEY-----"
#define PEM_RSA_FOOTER "-----END RSA PRIVATE KEY-----"
#define PEM_DSA_HEADER "-----BEGIN DSA PRIVATE KEY-----"
#define PEM_DSA_FOOTER "-----END DSA PRIVATE KEY-----"
/*******************************************************************/
/*
* Windows CNG backend: Missing definitions (for MinGW[-w64])
*/
#ifndef BCRYPT_SUCCESS
#define BCRYPT_SUCCESS(Status) (((NTSTATUS)(Status)) >= 0)
#endif
#ifndef BCRYPT_RNG_ALGORITHM
#define BCRYPT_RNG_ALGORITHM L"RNG"
#endif
#ifndef BCRYPT_MD5_ALGORITHM
#define BCRYPT_MD5_ALGORITHM L"MD5"
#endif
#ifndef BCRYPT_SHA1_ALGORITHM
#define BCRYPT_SHA1_ALGORITHM L"SHA1"
#endif
#ifndef BCRYPT_SHA256_ALGORITHM
#define BCRYPT_SHA256_ALGORITHM L"SHA256"
#endif
#ifndef BCRYPT_SHA512_ALGORITHM
#define BCRYPT_SHA512_ALGORITHM L"SHA512"
#endif
#ifndef BCRYPT_RSA_ALGORITHM
#define BCRYPT_RSA_ALGORITHM L"RSA"
#endif
#ifndef BCRYPT_DSA_ALGORITHM
#define BCRYPT_DSA_ALGORITHM L"DSA"
#endif
#ifndef BCRYPT_AES_ALGORITHM
#define BCRYPT_AES_ALGORITHM L"AES"
#endif
#ifndef BCRYPT_RC4_ALGORITHM
#define BCRYPT_RC4_ALGORITHM L"RC4"
#endif
#ifndef BCRYPT_3DES_ALGORITHM
#define BCRYPT_3DES_ALGORITHM L"3DES"
#endif
#ifndef BCRYPT_ALG_HANDLE_HMAC_FLAG
#define BCRYPT_ALG_HANDLE_HMAC_FLAG 0x00000008
#endif
#ifndef BCRYPT_DSA_PUBLIC_BLOB
#define BCRYPT_DSA_PUBLIC_BLOB L"DSAPUBLICBLOB"
#endif
#ifndef BCRYPT_DSA_PUBLIC_MAGIC
#define BCRYPT_DSA_PUBLIC_MAGIC 0x42505344 /* DSPB */
#endif
#ifndef BCRYPT_DSA_PRIVATE_BLOB
#define BCRYPT_DSA_PRIVATE_BLOB L"DSAPRIVATEBLOB"
#endif
#ifndef BCRYPT_DSA_PRIVATE_MAGIC
#define BCRYPT_DSA_PRIVATE_MAGIC 0x56505344 /* DSPV */
#endif
#ifndef BCRYPT_RSAPUBLIC_BLOB
#define BCRYPT_RSAPUBLIC_BLOB L"RSAPUBLICBLOB"
#endif
#ifndef BCRYPT_RSAPUBLIC_MAGIC
#define BCRYPT_RSAPUBLIC_MAGIC 0x31415352 /* RSA1 */
#endif
#ifndef BCRYPT_RSAFULLPRIVATE_BLOB
#define BCRYPT_RSAFULLPRIVATE_BLOB L"RSAFULLPRIVATEBLOB"
#endif
#ifndef BCRYPT_RSAFULLPRIVATE_MAGIC
#define BCRYPT_RSAFULLPRIVATE_MAGIC 0x33415352 /* RSA3 */
#endif
#ifndef BCRYPT_KEY_DATA_BLOB
#define BCRYPT_KEY_DATA_BLOB L"KeyDataBlob"
#endif
#ifndef BCRYPT_MESSAGE_BLOCK_LENGTH
#define BCRYPT_MESSAGE_BLOCK_LENGTH L"MessageBlockLength"
#endif
#ifndef BCRYPT_NO_KEY_VALIDATION
#define BCRYPT_NO_KEY_VALIDATION 0x00000008
#endif
#ifndef BCRYPT_BLOCK_PADDING
#define BCRYPT_BLOCK_PADDING 0x00000001
#endif
#ifndef BCRYPT_PAD_NONE
#define BCRYPT_PAD_NONE 0x00000001
#endif
#ifndef BCRYPT_PAD_PKCS1
#define BCRYPT_PAD_PKCS1 0x00000002
#endif
#ifndef BCRYPT_PAD_OAEP
#define BCRYPT_PAD_OAEP 0x00000004
#endif
#ifndef BCRYPT_PAD_PSS
#define BCRYPT_PAD_PSS 0x00000008
#endif
#ifndef CRYPT_STRING_ANY
#define CRYPT_STRING_ANY 0x00000007
#endif
#ifndef LEGACY_RSAPRIVATE_BLOB
#define LEGACY_RSAPRIVATE_BLOB L"CAPIPRIVATEBLOB"
#endif
#ifndef PKCS_RSA_PRIVATE_KEY
#define PKCS_RSA_PRIVATE_KEY (LPCSTR)43
#endif
/*******************************************************************/
/*
* Windows CNG backend: Generic functions
*/
void
_libssh2_wincng_init(void)
{
int ret;
(void)BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgRNG,
BCRYPT_RNG_ALGORITHM, NULL, 0);
(void)BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHashMD5,
BCRYPT_MD5_ALGORITHM, NULL, 0);
(void)BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHashSHA1,
BCRYPT_SHA1_ALGORITHM, NULL, 0);
(void)BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHashSHA256,
BCRYPT_SHA256_ALGORITHM, NULL, 0);
(void)BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHashSHA512,
BCRYPT_SHA512_ALGORITHM, NULL, 0);
(void)BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHmacMD5,
BCRYPT_MD5_ALGORITHM, NULL,
BCRYPT_ALG_HANDLE_HMAC_FLAG);
(void)BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHmacSHA1,
BCRYPT_SHA1_ALGORITHM, NULL,
BCRYPT_ALG_HANDLE_HMAC_FLAG);
(void)BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHmacSHA256,
BCRYPT_SHA256_ALGORITHM, NULL,
BCRYPT_ALG_HANDLE_HMAC_FLAG);
(void)BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHmacSHA512,
BCRYPT_SHA512_ALGORITHM, NULL,
BCRYPT_ALG_HANDLE_HMAC_FLAG);
(void)BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgRSA,
BCRYPT_RSA_ALGORITHM, NULL, 0);
(void)BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgDSA,
BCRYPT_DSA_ALGORITHM, NULL, 0);
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgAES_CBC,
BCRYPT_AES_ALGORITHM, NULL, 0);
if(BCRYPT_SUCCESS(ret)) {
ret = BCryptSetProperty(_libssh2_wincng.hAlgAES_CBC,
BCRYPT_CHAINING_MODE,
(PBYTE)BCRYPT_CHAIN_MODE_CBC,
sizeof(BCRYPT_CHAIN_MODE_CBC), 0);
if(!BCRYPT_SUCCESS(ret)) {
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgAES_CBC, 0);
}
}
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgAES_ECB,
BCRYPT_AES_ALGORITHM, NULL, 0);
if(BCRYPT_SUCCESS(ret)) {
ret = BCryptSetProperty(_libssh2_wincng.hAlgAES_ECB,
BCRYPT_CHAINING_MODE,
(PBYTE)BCRYPT_CHAIN_MODE_ECB,
sizeof(BCRYPT_CHAIN_MODE_ECB), 0);
if(!BCRYPT_SUCCESS(ret)) {
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgAES_ECB, 0);
}
}
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgRC4_NA,
BCRYPT_RC4_ALGORITHM, NULL, 0);
if(BCRYPT_SUCCESS(ret)) {
ret = BCryptSetProperty(_libssh2_wincng.hAlgRC4_NA,
BCRYPT_CHAINING_MODE,
(PBYTE)BCRYPT_CHAIN_MODE_NA,
sizeof(BCRYPT_CHAIN_MODE_NA), 0);
if(!BCRYPT_SUCCESS(ret)) {
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgRC4_NA, 0);
}
}
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlg3DES_CBC,
BCRYPT_3DES_ALGORITHM, NULL, 0);
if(BCRYPT_SUCCESS(ret)) {
ret = BCryptSetProperty(_libssh2_wincng.hAlg3DES_CBC,
BCRYPT_CHAINING_MODE,
(PBYTE)BCRYPT_CHAIN_MODE_CBC,
sizeof(BCRYPT_CHAIN_MODE_CBC), 0);
if(!BCRYPT_SUCCESS(ret)) {
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlg3DES_CBC,
0);
}
}
}
void
_libssh2_wincng_free(void)
{
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgRNG, 0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHashMD5, 0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHashSHA1, 0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHashSHA256, 0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHashSHA512, 0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHmacMD5, 0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHmacSHA1, 0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHmacSHA256, 0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHmacSHA512, 0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgRSA, 0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgDSA, 0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgAES_CBC, 0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgRC4_NA, 0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlg3DES_CBC, 0);
memset(&_libssh2_wincng, 0, sizeof(_libssh2_wincng));
}
int
_libssh2_wincng_random(void *buf, int len)
{
int ret;
ret = BCryptGenRandom(_libssh2_wincng.hAlgRNG, buf, len, 0);
return BCRYPT_SUCCESS(ret) ? 0 : -1;
}
static void
_libssh2_wincng_safe_free(void *buf, int len)
{
#ifndef LIBSSH2_CLEAR_MEMORY
(void)len;
#endif
if(!buf)
return;
#ifdef LIBSSH2_CLEAR_MEMORY
if(len > 0)
SecureZeroMemory(buf, len);
#endif
free(buf);
}
/*******************************************************************/
/*
* Windows CNG backend: Hash functions
*/
int
_libssh2_wincng_hash_init(_libssh2_wincng_hash_ctx *ctx,
BCRYPT_ALG_HANDLE hAlg, unsigned long hashlen,
unsigned char *key, unsigned long keylen)
{
BCRYPT_HASH_HANDLE hHash;
unsigned char *pbHashObject;
unsigned long dwHashObject, dwHash, cbData;
int ret;
ret = BCryptGetProperty(hAlg, BCRYPT_HASH_LENGTH,
(unsigned char *)&dwHash,
sizeof(dwHash),
&cbData, 0);
if((!BCRYPT_SUCCESS(ret)) || dwHash != hashlen) {
return -1;
}
ret = BCryptGetProperty(hAlg, BCRYPT_OBJECT_LENGTH,
(unsigned char *)&dwHashObject,
sizeof(dwHashObject),
&cbData, 0);
if(!BCRYPT_SUCCESS(ret)) {
return -1;
}
pbHashObject = malloc(dwHashObject);
if(!pbHashObject) {
return -1;
}
ret = BCryptCreateHash(hAlg, &hHash,
pbHashObject, dwHashObject,
key, keylen, 0);
if(!BCRYPT_SUCCESS(ret)) {
_libssh2_wincng_safe_free(pbHashObject, dwHashObject);
return -1;
}
ctx->hHash = hHash;
ctx->pbHashObject = pbHashObject;
ctx->dwHashObject = dwHashObject;
ctx->cbHash = dwHash;
return 0;
}
int
_libssh2_wincng_hash_update(_libssh2_wincng_hash_ctx *ctx,
const unsigned char *data, unsigned long datalen)
{
int ret;
ret = BCryptHashData(ctx->hHash, (unsigned char *)data, datalen, 0);
return BCRYPT_SUCCESS(ret) ? 0 : -1;
}
int
_libssh2_wincng_hash_final(_libssh2_wincng_hash_ctx *ctx,
unsigned char *hash)
{
int ret;
ret = BCryptFinishHash(ctx->hHash, hash, ctx->cbHash, 0);
BCryptDestroyHash(ctx->hHash);
ctx->hHash = NULL;
_libssh2_wincng_safe_free(ctx->pbHashObject, ctx->dwHashObject);
ctx->pbHashObject = NULL;
ctx->dwHashObject = 0;
return BCRYPT_SUCCESS(ret) ? 0 : -1;
}
int
_libssh2_wincng_hash(unsigned char *data, unsigned long datalen,
BCRYPT_ALG_HANDLE hAlg,
unsigned char *hash, unsigned long hashlen)
{
_libssh2_wincng_hash_ctx ctx;
int ret;
ret = _libssh2_wincng_hash_init(&ctx, hAlg, hashlen, NULL, 0);
if(!ret) {
ret = _libssh2_wincng_hash_update(&ctx, data, datalen);
ret |= _libssh2_wincng_hash_final(&ctx, hash);
}
return ret;
}
/*******************************************************************/
/*
* Windows CNG backend: HMAC functions
*/
int
_libssh2_wincng_hmac_final(_libssh2_wincng_hash_ctx *ctx,
unsigned char *hash)
{
int ret;
ret = BCryptFinishHash(ctx->hHash, hash, ctx->cbHash, 0);
return BCRYPT_SUCCESS(ret) ? 0 : -1;
}
void
_libssh2_wincng_hmac_cleanup(_libssh2_wincng_hash_ctx *ctx)
{
BCryptDestroyHash(ctx->hHash);
ctx->hHash = NULL;
_libssh2_wincng_safe_free(ctx->pbHashObject, ctx->dwHashObject);
ctx->pbHashObject = NULL;
ctx->dwHashObject = 0;
}
/*******************************************************************/
/*
* Windows CNG backend: Key functions
*/
int
_libssh2_wincng_key_sha1_verify(_libssh2_wincng_key_ctx *ctx,
const unsigned char *sig,
unsigned long sig_len,
const unsigned char *m,
unsigned long m_len,
unsigned long flags)
{
BCRYPT_PKCS1_PADDING_INFO paddingInfoPKCS1;
void *pPaddingInfo;
unsigned char *data, *hash;
unsigned long datalen, hashlen;
int ret;
datalen = m_len;
data = malloc(datalen);
if(!data) {
return -1;
}
hashlen = SHA_DIGEST_LENGTH;
hash = malloc(hashlen);
if(!hash) {
free(data);
return -1;
}
memcpy(data, m, datalen);
ret = _libssh2_wincng_hash(data, datalen,
_libssh2_wincng.hAlgHashSHA1,
hash, hashlen);
_libssh2_wincng_safe_free(data, datalen);
if(ret) {
_libssh2_wincng_safe_free(hash, hashlen);
return -1;
}
datalen = sig_len;
data = malloc(datalen);
if(!data) {
_libssh2_wincng_safe_free(hash, hashlen);
return -1;
}
if(flags & BCRYPT_PAD_PKCS1) {
paddingInfoPKCS1.pszAlgId = BCRYPT_SHA1_ALGORITHM;
pPaddingInfo = &paddingInfoPKCS1;
}
else
pPaddingInfo = NULL;
memcpy(data, sig, datalen);
ret = BCryptVerifySignature(ctx->hKey, pPaddingInfo,
hash, hashlen, data, datalen, flags);
_libssh2_wincng_safe_free(hash, hashlen);
_libssh2_wincng_safe_free(data, datalen);
return BCRYPT_SUCCESS(ret) ? 0 : -1;
}
#ifdef HAVE_LIBCRYPT32
static int
_libssh2_wincng_load_pem(LIBSSH2_SESSION *session,
const char *filename,
const char *passphrase,
const char *headerbegin,
const char *headerend,
unsigned char **data,
unsigned int *datalen)
{
FILE *fp;
int ret;
fp = fopen(filename, FOPEN_READTEXT);
if(!fp) {
return -1;
}
ret = _libssh2_pem_parse(session, headerbegin, headerend,
passphrase,
fp, data, datalen);
fclose(fp);
return ret;
}
static int
_libssh2_wincng_load_private(LIBSSH2_SESSION *session,
const char *filename,
const char *passphrase,
unsigned char **ppbEncoded,
unsigned long *pcbEncoded,
int tryLoadRSA, int tryLoadDSA)
{
unsigned char *data = NULL;
unsigned int datalen = 0;
int ret = -1;
if(ret && tryLoadRSA) {
ret = _libssh2_wincng_load_pem(session, filename, passphrase,
PEM_RSA_HEADER, PEM_RSA_FOOTER,
&data, &datalen);
}
if(ret && tryLoadDSA) {
ret = _libssh2_wincng_load_pem(session, filename, passphrase,
PEM_DSA_HEADER, PEM_DSA_FOOTER,
&data, &datalen);
}
if(!ret) {
*ppbEncoded = data;
*pcbEncoded = datalen;
}
return ret;
}
static int
_libssh2_wincng_load_private_memory(LIBSSH2_SESSION *session,
const char *privatekeydata,
size_t privatekeydata_len,
const char *passphrase,
unsigned char **ppbEncoded,
unsigned long *pcbEncoded,
int tryLoadRSA, int tryLoadDSA)
{
unsigned char *data = NULL;
unsigned int datalen = 0;
int ret = -1;
(void)passphrase;
if(ret && tryLoadRSA) {
ret = _libssh2_pem_parse_memory(session,
PEM_RSA_HEADER, PEM_RSA_FOOTER,
privatekeydata, privatekeydata_len,
&data, &datalen);
}
if(ret && tryLoadDSA) {
ret = _libssh2_pem_parse_memory(session,
PEM_DSA_HEADER, PEM_DSA_FOOTER,
privatekeydata, privatekeydata_len,
&data, &datalen);
}
if(!ret) {
*ppbEncoded = data;
*pcbEncoded = datalen;
}
return ret;
}
static int
_libssh2_wincng_asn_decode(unsigned char *pbEncoded,
unsigned long cbEncoded,
LPCSTR lpszStructType,
unsigned char **ppbDecoded,
unsigned long *pcbDecoded)
{
unsigned char *pbDecoded = NULL;
unsigned long cbDecoded = 0;
int ret;
ret = CryptDecodeObjectEx(X509_ASN_ENCODING | PKCS_7_ASN_ENCODING,
lpszStructType,
pbEncoded, cbEncoded, 0, NULL,
NULL, &cbDecoded);
if(!ret) {
return -1;
}
pbDecoded = malloc(cbDecoded);
if(!pbDecoded) {
return -1;
}
ret = CryptDecodeObjectEx(X509_ASN_ENCODING | PKCS_7_ASN_ENCODING,
lpszStructType,
pbEncoded, cbEncoded, 0, NULL,
pbDecoded, &cbDecoded);
if(!ret) {
_libssh2_wincng_safe_free(pbDecoded, cbDecoded);
return -1;
}
*ppbDecoded = pbDecoded;
*pcbDecoded = cbDecoded;
return 0;
}
static int
_libssh2_wincng_bn_ltob(unsigned char *pbInput,
unsigned long cbInput,
unsigned char **ppbOutput,
unsigned long *pcbOutput)
{
unsigned char *pbOutput;
unsigned long cbOutput, index, offset, length;
if(cbInput < 1) {
return 0;
}
offset = 0;
length = cbInput - 1;
cbOutput = cbInput;
if(pbInput[length] & (1 << 7)) {
offset++;
cbOutput += offset;
}
pbOutput = (unsigned char *)malloc(cbOutput);
if(!pbOutput) {
return -1;
}
pbOutput[0] = 0;
for(index = 0; ((index + offset) < cbOutput)
&& (index < cbInput); index++) {
pbOutput[index + offset] = pbInput[length - index];
}
*ppbOutput = pbOutput;
*pcbOutput = cbOutput;
return 0;
}
static int
_libssh2_wincng_asn_decode_bn(unsigned char *pbEncoded,
unsigned long cbEncoded,
unsigned char **ppbDecoded,
unsigned long *pcbDecoded)
{
unsigned char *pbDecoded = NULL, *pbInteger;
unsigned long cbDecoded = 0, cbInteger;
int ret;
ret = _libssh2_wincng_asn_decode(pbEncoded, cbEncoded,
X509_MULTI_BYTE_UINT,
&pbInteger, &cbInteger);
if(!ret) {
ret = _libssh2_wincng_bn_ltob(((PCRYPT_DATA_BLOB)pbInteger)->pbData,
((PCRYPT_DATA_BLOB)pbInteger)->cbData,
&pbDecoded, &cbDecoded);
if(!ret) {
*ppbDecoded = pbDecoded;
*pcbDecoded = cbDecoded;
}
_libssh2_wincng_safe_free(pbInteger, cbInteger);
}
return ret;
}
static int
_libssh2_wincng_asn_decode_bns(unsigned char *pbEncoded,
unsigned long cbEncoded,
unsigned char ***prpbDecoded,
unsigned long **prcbDecoded,
unsigned long *pcbCount)
{
PCRYPT_DER_BLOB pBlob;
unsigned char *pbDecoded, **rpbDecoded;
unsigned long cbDecoded, *rcbDecoded, index, length;
int ret;
ret = _libssh2_wincng_asn_decode(pbEncoded, cbEncoded,
X509_SEQUENCE_OF_ANY,
&pbDecoded, &cbDecoded);
if(!ret) {
length = ((PCRYPT_DATA_BLOB)pbDecoded)->cbData;
rpbDecoded = malloc(sizeof(PBYTE) * length);
if(rpbDecoded) {
rcbDecoded = malloc(sizeof(DWORD) * length);
if(rcbDecoded) {
for(index = 0; index < length; index++) {
pBlob = &((PCRYPT_DER_BLOB)
((PCRYPT_DATA_BLOB)pbDecoded)->pbData)[index];
ret = _libssh2_wincng_asn_decode_bn(pBlob->pbData,
pBlob->cbData,
&rpbDecoded[index],
&rcbDecoded[index]);
if(ret)
break;
}
if(!ret) {
*prpbDecoded = rpbDecoded;
*prcbDecoded = rcbDecoded;
*pcbCount = length;
}
else {
for(length = 0; length < index; length++) {
_libssh2_wincng_safe_free(rpbDecoded[length],
rcbDecoded[length]);
rpbDecoded[length] = NULL;
rcbDecoded[length] = 0;
}
free(rpbDecoded);
free(rcbDecoded);
}
}
else {
free(rpbDecoded);
ret = -1;
}
}
else {
ret = -1;
}
_libssh2_wincng_safe_free(pbDecoded, cbDecoded);
}
return ret;
}
#endif /* HAVE_LIBCRYPT32 */
static unsigned long
_libssh2_wincng_bn_size(const unsigned char *bignum,
unsigned long length)
{
unsigned long offset;
if(!bignum)
return 0;
length--;
offset = 0;
while(!(*(bignum + offset)) && (offset < length))
offset++;
length++;
return length - offset;
}
/*******************************************************************/
/*
* Windows CNG backend: RSA functions
*/
int
_libssh2_wincng_rsa_new(libssh2_rsa_ctx **rsa,
const unsigned char *edata,
unsigned long elen,
const unsigned char *ndata,
unsigned long nlen,
const unsigned char *ddata,
unsigned long dlen,
const unsigned char *pdata,
unsigned long plen,
const unsigned char *qdata,
unsigned long qlen,
const unsigned char *e1data,
unsigned long e1len,
const unsigned char *e2data,
unsigned long e2len,
const unsigned char *coeffdata,
unsigned long coefflen)
{
BCRYPT_KEY_HANDLE hKey;
BCRYPT_RSAKEY_BLOB *rsakey;
LPCWSTR lpszBlobType;
unsigned char *key;
unsigned long keylen, offset, mlen, p1len = 0, p2len = 0;
int ret;
mlen = max(_libssh2_wincng_bn_size(ndata, nlen),
_libssh2_wincng_bn_size(ddata, dlen));
offset = sizeof(BCRYPT_RSAKEY_BLOB);
keylen = offset + elen + mlen;
if(ddata && dlen > 0) {
p1len = max(_libssh2_wincng_bn_size(pdata, plen),
_libssh2_wincng_bn_size(e1data, e1len));
p2len = max(_libssh2_wincng_bn_size(qdata, qlen),
_libssh2_wincng_bn_size(e2data, e2len));
keylen += p1len * 3 + p2len * 2 + mlen;
}
key = malloc(keylen);
if(!key) {
return -1;
}
memset(key, 0, keylen);
/* https://msdn.microsoft.com/library/windows/desktop/aa375531.aspx */
rsakey = (BCRYPT_RSAKEY_BLOB *)key;
rsakey->BitLength = mlen * 8;
rsakey->cbPublicExp = elen;
rsakey->cbModulus = mlen;
memcpy(key + offset, edata, elen);
offset += elen;
if(nlen < mlen)
memcpy(key + offset + mlen - nlen, ndata, nlen);
else
memcpy(key + offset, ndata + nlen - mlen, mlen);
if(ddata && dlen > 0) {
offset += mlen;
if(plen < p1len)
memcpy(key + offset + p1len - plen, pdata, plen);
else
memcpy(key + offset, pdata + plen - p1len, p1len);
offset += p1len;
if(qlen < p2len)
memcpy(key + offset + p2len - qlen, qdata, qlen);
else
memcpy(key + offset, qdata + qlen - p2len, p2len);
offset += p2len;
if(e1len < p1len)
memcpy(key + offset + p1len - e1len, e1data, e1len);
else
memcpy(key + offset, e1data + e1len - p1len, p1len);
offset += p1len;
if(e2len < p2len)
memcpy(key + offset + p2len - e2len, e2data, e2len);
else
memcpy(key + offset, e2data + e2len - p2len, p2len);
offset += p2len;
if(coefflen < p1len)
memcpy(key + offset + p1len - coefflen, coeffdata, coefflen);
else
memcpy(key + offset, coeffdata + coefflen - p1len, p1len);
offset += p1len;
if(dlen < mlen)
memcpy(key + offset + mlen - dlen, ddata, dlen);
else
memcpy(key + offset, ddata + dlen - mlen, mlen);
lpszBlobType = BCRYPT_RSAFULLPRIVATE_BLOB;
rsakey->Magic = BCRYPT_RSAFULLPRIVATE_MAGIC;
rsakey->cbPrime1 = p1len;
rsakey->cbPrime2 = p2len;
}
else {
lpszBlobType = BCRYPT_RSAPUBLIC_BLOB;
rsakey->Magic = BCRYPT_RSAPUBLIC_MAGIC;
rsakey->cbPrime1 = 0;
rsakey->cbPrime2 = 0;
}
ret = BCryptImportKeyPair(_libssh2_wincng.hAlgRSA, NULL, lpszBlobType,
&hKey, key, keylen, 0);
if(!BCRYPT_SUCCESS(ret)) {
_libssh2_wincng_safe_free(key, keylen);
return -1;
}
*rsa = malloc(sizeof(libssh2_rsa_ctx));
if(!(*rsa)) {
BCryptDestroyKey(hKey);
_libssh2_wincng_safe_free(key, keylen);
return -1;
}
(*rsa)->hKey = hKey;
(*rsa)->pbKeyObject = key;
(*rsa)->cbKeyObject = keylen;
return 0;
}
#ifdef HAVE_LIBCRYPT32
static int
_libssh2_wincng_rsa_new_private_parse(libssh2_rsa_ctx **rsa,
LIBSSH2_SESSION *session,
unsigned char *pbEncoded,
unsigned long cbEncoded)
{
BCRYPT_KEY_HANDLE hKey;
unsigned char *pbStructInfo;
unsigned long cbStructInfo;
int ret;
(void)session;
ret = _libssh2_wincng_asn_decode(pbEncoded, cbEncoded,
PKCS_RSA_PRIVATE_KEY,
&pbStructInfo, &cbStructInfo);
_libssh2_wincng_safe_free(pbEncoded, cbEncoded);
if(ret) {
return -1;
}
ret = BCryptImportKeyPair(_libssh2_wincng.hAlgRSA, NULL,
LEGACY_RSAPRIVATE_BLOB, &hKey,
pbStructInfo, cbStructInfo, 0);
if(!BCRYPT_SUCCESS(ret)) {
_libssh2_wincng_safe_free(pbStructInfo, cbStructInfo);
return -1;
}
*rsa = malloc(sizeof(libssh2_rsa_ctx));
if(!(*rsa)) {
BCryptDestroyKey(hKey);
_libssh2_wincng_safe_free(pbStructInfo, cbStructInfo);
return -1;
}
(*rsa)->hKey = hKey;
(*rsa)->pbKeyObject = pbStructInfo;
(*rsa)->cbKeyObject = cbStructInfo;
return 0;
}
#endif /* HAVE_LIBCRYPT32 */
int
_libssh2_wincng_rsa_new_private(libssh2_rsa_ctx **rsa,
LIBSSH2_SESSION *session,
const char *filename,
const unsigned char *passphrase)
{
#ifdef HAVE_LIBCRYPT32
unsigned char *pbEncoded;
unsigned long cbEncoded;
int ret;
(void)session;
ret = _libssh2_wincng_load_private(session, filename,
(const char *)passphrase,
&pbEncoded, &cbEncoded, 1, 0);
if(ret) {
return -1;
}
return _libssh2_wincng_rsa_new_private_parse(rsa, session,
pbEncoded, cbEncoded);
#else
(void)rsa;
(void)filename;
(void)passphrase;
return _libssh2_error(session, LIBSSH2_ERROR_FILE,
"Unable to load RSA key from private key file: "
"Method unsupported in Windows CNG backend");
#endif /* HAVE_LIBCRYPT32 */
}
int
_libssh2_wincng_rsa_new_private_frommemory(libssh2_rsa_ctx **rsa,
LIBSSH2_SESSION *session,
const char *filedata,
size_t filedata_len,
unsigned const char *passphrase)
{
#ifdef HAVE_LIBCRYPT32
unsigned char *pbEncoded;
unsigned long cbEncoded;
int ret;
(void)session;
ret = _libssh2_wincng_load_private_memory(session, filedata, filedata_len,
(const char *)passphrase,
&pbEncoded, &cbEncoded, 1, 0);
if(ret) {
return -1;
}
return _libssh2_wincng_rsa_new_private_parse(rsa, session,
pbEncoded, cbEncoded);
#else
(void)rsa;
(void)filedata;
(void)filedata_len;
(void)passphrase;
return _libssh2_error(session, LIBSSH2_ERROR_METHOD_NOT_SUPPORTED,
"Unable to extract private key from memory: "
"Method unsupported in Windows CNG backend");
#endif /* HAVE_LIBCRYPT32 */
}
int
_libssh2_wincng_rsa_sha1_verify(libssh2_rsa_ctx *rsa,
const unsigned char *sig,
unsigned long sig_len,
const unsigned char *m,
unsigned long m_len)
{
return _libssh2_wincng_key_sha1_verify(rsa, sig, sig_len, m, m_len,
BCRYPT_PAD_PKCS1);
}
int
_libssh2_wincng_rsa_sha1_sign(LIBSSH2_SESSION *session,
libssh2_rsa_ctx *rsa,
const unsigned char *hash,
size_t hash_len,
unsigned char **signature,
size_t *signature_len)
{
BCRYPT_PKCS1_PADDING_INFO paddingInfo;
unsigned char *data, *sig;
unsigned long cbData, datalen, siglen;
int ret;
datalen = (unsigned long)hash_len;
data = malloc(datalen);
if(!data) {
return -1;
}
paddingInfo.pszAlgId = BCRYPT_SHA1_ALGORITHM;
memcpy(data, hash, datalen);
ret = BCryptSignHash(rsa->hKey, &paddingInfo,
data, datalen, NULL, 0,
&cbData, BCRYPT_PAD_PKCS1);
if(BCRYPT_SUCCESS(ret)) {
siglen = cbData;
sig = LIBSSH2_ALLOC(session, siglen);
if(sig) {
ret = BCryptSignHash(rsa->hKey, &paddingInfo,
data, datalen, sig, siglen,
&cbData, BCRYPT_PAD_PKCS1);
if(BCRYPT_SUCCESS(ret)) {
*signature_len = siglen;
*signature = sig;
}
else {
LIBSSH2_FREE(session, sig);
}
}
else
ret = STATUS_NO_MEMORY;
}
_libssh2_wincng_safe_free(data, datalen);
return BCRYPT_SUCCESS(ret) ? 0 : -1;
}
void
_libssh2_wincng_rsa_free(libssh2_rsa_ctx *rsa)
{
if(!rsa)
return;
BCryptDestroyKey(rsa->hKey);
rsa->hKey = NULL;
_libssh2_wincng_safe_free(rsa->pbKeyObject, rsa->cbKeyObject);
_libssh2_wincng_safe_free(rsa, sizeof(libssh2_rsa_ctx));
}
/*******************************************************************/
/*
* Windows CNG backend: DSA functions
*/
#if LIBSSH2_DSA
int
_libssh2_wincng_dsa_new(libssh2_dsa_ctx **dsa,
const unsigned char *pdata,
unsigned long plen,
const unsigned char *qdata,
unsigned long qlen,
const unsigned char *gdata,
unsigned long glen,
const unsigned char *ydata,
unsigned long ylen,
const unsigned char *xdata,
unsigned long xlen)
{
BCRYPT_KEY_HANDLE hKey;
BCRYPT_DSA_KEY_BLOB *dsakey;
LPCWSTR lpszBlobType;
unsigned char *key;
unsigned long keylen, offset, length;
int ret;
length = max(max(_libssh2_wincng_bn_size(pdata, plen),
_libssh2_wincng_bn_size(gdata, glen)),
_libssh2_wincng_bn_size(ydata, ylen));
offset = sizeof(BCRYPT_DSA_KEY_BLOB);
keylen = offset + length * 3;
if(xdata && xlen > 0)
keylen += 20;
key = malloc(keylen);
if(!key) {
return -1;
}
memset(key, 0, keylen);
/* https://msdn.microsoft.com/library/windows/desktop/aa833126.aspx */
dsakey = (BCRYPT_DSA_KEY_BLOB *)key;
dsakey->cbKey = length;
memset(dsakey->Count, -1, sizeof(dsakey->Count));
memset(dsakey->Seed, -1, sizeof(dsakey->Seed));
if(qlen < 20)
memcpy(dsakey->q + 20 - qlen, qdata, qlen);
else
memcpy(dsakey->q, qdata + qlen - 20, 20);
if(plen < length)
memcpy(key + offset + length - plen, pdata, plen);
else
memcpy(key + offset, pdata + plen - length, length);
offset += length;
if(glen < length)
memcpy(key + offset + length - glen, gdata, glen);
else
memcpy(key + offset, gdata + glen - length, length);
offset += length;
if(ylen < length)
memcpy(key + offset + length - ylen, ydata, ylen);
else
memcpy(key + offset, ydata + ylen - length, length);
if(xdata && xlen > 0) {
offset += length;
if(xlen < 20)
memcpy(key + offset + 20 - xlen, xdata, xlen);
else
memcpy(key + offset, xdata + xlen - 20, 20);
lpszBlobType = BCRYPT_DSA_PRIVATE_BLOB;
dsakey->dwMagic = BCRYPT_DSA_PRIVATE_MAGIC;
}
else {
lpszBlobType = BCRYPT_DSA_PUBLIC_BLOB;
dsakey->dwMagic = BCRYPT_DSA_PUBLIC_MAGIC;
}
ret = BCryptImportKeyPair(_libssh2_wincng.hAlgDSA, NULL, lpszBlobType,
&hKey, key, keylen, 0);
if(!BCRYPT_SUCCESS(ret)) {
_libssh2_wincng_safe_free(key, keylen);
return -1;
}
*dsa = malloc(sizeof(libssh2_dsa_ctx));
if(!(*dsa)) {
BCryptDestroyKey(hKey);
_libssh2_wincng_safe_free(key, keylen);
return -1;
}
(*dsa)->hKey = hKey;
(*dsa)->pbKeyObject = key;
(*dsa)->cbKeyObject = keylen;
return 0;
}
#ifdef HAVE_LIBCRYPT32
static int
_libssh2_wincng_dsa_new_private_parse(libssh2_dsa_ctx **dsa,
LIBSSH2_SESSION *session,
unsigned char *pbEncoded,
unsigned long cbEncoded)
{
unsigned char **rpbDecoded;
unsigned long *rcbDecoded, index, length;
int ret;
(void)session;
ret = _libssh2_wincng_asn_decode_bns(pbEncoded, cbEncoded,
&rpbDecoded, &rcbDecoded, &length);
_libssh2_wincng_safe_free(pbEncoded, cbEncoded);
if(ret) {
return -1;
}
if(length == 6) {
ret = _libssh2_wincng_dsa_new(dsa,
rpbDecoded[1], rcbDecoded[1],
rpbDecoded[2], rcbDecoded[2],
rpbDecoded[3], rcbDecoded[3],
rpbDecoded[4], rcbDecoded[4],
rpbDecoded[5], rcbDecoded[5]);
}
else {
ret = -1;
}
for(index = 0; index < length; index++) {
_libssh2_wincng_safe_free(rpbDecoded[index], rcbDecoded[index]);
rpbDecoded[index] = NULL;
rcbDecoded[index] = 0;
}
free(rpbDecoded);
free(rcbDecoded);
return ret;
}
#endif /* HAVE_LIBCRYPT32 */
int
_libssh2_wincng_dsa_new_private(libssh2_dsa_ctx **dsa,
LIBSSH2_SESSION *session,
const char *filename,
const unsigned char *passphrase)
{
#ifdef HAVE_LIBCRYPT32
unsigned char *pbEncoded;
unsigned long cbEncoded;
int ret;
ret = _libssh2_wincng_load_private(session, filename,
(const char *)passphrase,
&pbEncoded, &cbEncoded, 0, 1);
if(ret) {
return -1;
}
return _libssh2_wincng_dsa_new_private_parse(dsa, session,
pbEncoded, cbEncoded);
#else
(void)dsa;
(void)filename;
(void)passphrase;
return _libssh2_error(session, LIBSSH2_ERROR_FILE,
"Unable to load DSA key from private key file: "
"Method unsupported in Windows CNG backend");
#endif /* HAVE_LIBCRYPT32 */
}
int
_libssh2_wincng_dsa_new_private_frommemory(libssh2_dsa_ctx **dsa,
LIBSSH2_SESSION *session,
const char *filedata,
size_t filedata_len,
unsigned const char *passphrase)
{
#ifdef HAVE_LIBCRYPT32
unsigned char *pbEncoded;
unsigned long cbEncoded;
int ret;
ret = _libssh2_wincng_load_private_memory(session, filedata, filedata_len,
(const char *)passphrase,
&pbEncoded, &cbEncoded, 0, 1);
if(ret) {
return -1;
}
return _libssh2_wincng_dsa_new_private_parse(dsa, session,
pbEncoded, cbEncoded);
#else
(void)dsa;
(void)filedata;
(void)filedata_len;
(void)passphrase;
return _libssh2_error(session, LIBSSH2_ERROR_METHOD_NOT_SUPPORTED,
"Unable to extract private key from memory: "
"Method unsupported in Windows CNG backend");
#endif /* HAVE_LIBCRYPT32 */
}
int
_libssh2_wincng_dsa_sha1_verify(libssh2_dsa_ctx *dsa,
const unsigned char *sig_fixed,
const unsigned char *m,
unsigned long m_len)
{
return _libssh2_wincng_key_sha1_verify(dsa, sig_fixed, 40, m, m_len, 0);
}
int
_libssh2_wincng_dsa_sha1_sign(libssh2_dsa_ctx *dsa,
const unsigned char *hash,
unsigned long hash_len,
unsigned char *sig_fixed)
{
unsigned char *data, *sig;
unsigned long cbData, datalen, siglen;
int ret;
datalen = hash_len;
data = malloc(datalen);
if(!data) {
return -1;
}
memcpy(data, hash, datalen);
ret = BCryptSignHash(dsa->hKey, NULL, data, datalen,
NULL, 0, &cbData, 0);
if(BCRYPT_SUCCESS(ret)) {
siglen = cbData;
if(siglen == 40) {
sig = malloc(siglen);
if(sig) {
ret = BCryptSignHash(dsa->hKey, NULL, data, datalen,
sig, siglen, &cbData, 0);
if(BCRYPT_SUCCESS(ret)) {
memcpy(sig_fixed, sig, siglen);
}
_libssh2_wincng_safe_free(sig, siglen);
}
else
ret = STATUS_NO_MEMORY;
}
else
ret = STATUS_NO_MEMORY;
}
_libssh2_wincng_safe_free(data, datalen);
return BCRYPT_SUCCESS(ret) ? 0 : -1;
}
void
_libssh2_wincng_dsa_free(libssh2_dsa_ctx *dsa)
{
if(!dsa)
return;
BCryptDestroyKey(dsa->hKey);
dsa->hKey = NULL;
_libssh2_wincng_safe_free(dsa->pbKeyObject, dsa->cbKeyObject);
_libssh2_wincng_safe_free(dsa, sizeof(libssh2_dsa_ctx));
}
#endif
/*******************************************************************/
/*
* Windows CNG backend: Key functions
*/
#ifdef HAVE_LIBCRYPT32
static unsigned long
_libssh2_wincng_pub_priv_write(unsigned char *key,
unsigned long offset,
const unsigned char *bignum,
const unsigned long length)
{
_libssh2_htonu32(key + offset, length);
offset += 4;
memcpy(key + offset, bignum, length);
offset += length;
return offset;
}
static int
_libssh2_wincng_pub_priv_keyfile_parse(LIBSSH2_SESSION *session,
unsigned char **method,
size_t *method_len,
unsigned char **pubkeydata,
size_t *pubkeydata_len,
unsigned char *pbEncoded,
unsigned long cbEncoded)
{
unsigned char **rpbDecoded;
unsigned long *rcbDecoded;
unsigned char *key = NULL, *mth = NULL;
unsigned long keylen = 0, mthlen = 0;
unsigned long index, offset, length;
int ret;
ret = _libssh2_wincng_asn_decode_bns(pbEncoded, cbEncoded,
&rpbDecoded, &rcbDecoded, &length);
_libssh2_wincng_safe_free(pbEncoded, cbEncoded);
if(ret) {
return -1;
}
if(length == 9) { /* private RSA key */
mthlen = 7;
mth = LIBSSH2_ALLOC(session, mthlen);
if(mth) {
memcpy(mth, "ssh-rsa", mthlen);
}
else {
ret = -1;
}
keylen = 4 + mthlen + 4 + rcbDecoded[2] + 4 + rcbDecoded[1];
key = LIBSSH2_ALLOC(session, keylen);
if(key) {
offset = _libssh2_wincng_pub_priv_write(key, 0, mth, mthlen);
offset = _libssh2_wincng_pub_priv_write(key, offset,
rpbDecoded[2],
rcbDecoded[2]);
_libssh2_wincng_pub_priv_write(key, offset,
rpbDecoded[1],
rcbDecoded[1]);
}
else {
ret = -1;
}
}
else if(length == 6) { /* private DSA key */
mthlen = 7;
mth = LIBSSH2_ALLOC(session, mthlen);
if(mth) {
memcpy(mth, "ssh-dss", mthlen);
}
else {
ret = -1;
}
keylen = 4 + mthlen + 4 + rcbDecoded[1] + 4 + rcbDecoded[2]
+ 4 + rcbDecoded[3] + 4 + rcbDecoded[4];
key = LIBSSH2_ALLOC(session, keylen);
if(key) {
offset = _libssh2_wincng_pub_priv_write(key, 0, mth, mthlen);
offset = _libssh2_wincng_pub_priv_write(key, offset,
rpbDecoded[1],
rcbDecoded[1]);
offset = _libssh2_wincng_pub_priv_write(key, offset,
rpbDecoded[2],
rcbDecoded[2]);
offset = _libssh2_wincng_pub_priv_write(key, offset,
rpbDecoded[3],
rcbDecoded[3]);
_libssh2_wincng_pub_priv_write(key, offset,
rpbDecoded[4],
rcbDecoded[4]);
}
else {
ret = -1;
}
}
else {
ret = -1;
}
for(index = 0; index < length; index++) {
_libssh2_wincng_safe_free(rpbDecoded[index], rcbDecoded[index]);
rpbDecoded[index] = NULL;
rcbDecoded[index] = 0;
}
free(rpbDecoded);
free(rcbDecoded);
if(ret) {
if(mth)
LIBSSH2_FREE(session, mth);
if(key)
LIBSSH2_FREE(session, key);
}
else {
*method = mth;
*method_len = mthlen;
*pubkeydata = key;
*pubkeydata_len = keylen;
}
return ret;
}
#endif /* HAVE_LIBCRYPT32 */
int
_libssh2_wincng_pub_priv_keyfile(LIBSSH2_SESSION *session,
unsigned char **method,
size_t *method_len,
unsigned char **pubkeydata,
size_t *pubkeydata_len,
const char *privatekey,
const char *passphrase)
{
#ifdef HAVE_LIBCRYPT32
unsigned char *pbEncoded;
unsigned long cbEncoded;
int ret;
ret = _libssh2_wincng_load_private(session, privatekey, passphrase,
&pbEncoded, &cbEncoded, 1, 1);
if(ret) {
return -1;
}
return _libssh2_wincng_pub_priv_keyfile_parse(session, method, method_len,
pubkeydata, pubkeydata_len,
pbEncoded, cbEncoded);
#else
(void)method;
(void)method_len;
(void)pubkeydata;
(void)pubkeydata_len;
(void)privatekey;
(void)passphrase;
return _libssh2_error(session, LIBSSH2_ERROR_FILE,
"Unable to load public key from private key file: "
"Method unsupported in Windows CNG backend");
#endif /* HAVE_LIBCRYPT32 */
}
int
_libssh2_wincng_pub_priv_keyfilememory(LIBSSH2_SESSION *session,
unsigned char **method,
size_t *method_len,
unsigned char **pubkeydata,
size_t *pubkeydata_len,
const char *privatekeydata,
size_t privatekeydata_len,
const char *passphrase)
{
#ifdef HAVE_LIBCRYPT32
unsigned char *pbEncoded;
unsigned long cbEncoded;
int ret;
ret = _libssh2_wincng_load_private_memory(session, privatekeydata,
privatekeydata_len, passphrase,
&pbEncoded, &cbEncoded, 1, 1);
if(ret) {
return -1;
}
return _libssh2_wincng_pub_priv_keyfile_parse(session, method, method_len,
pubkeydata, pubkeydata_len,
pbEncoded, cbEncoded);
#else
(void)method;
(void)method_len;
(void)pubkeydata_len;
(void)pubkeydata;
(void)privatekeydata;
(void)privatekeydata_len;
(void)passphrase;
return _libssh2_error(session, LIBSSH2_ERROR_METHOD_NOT_SUPPORTED,
"Unable to extract public key from private key in memory: "
"Method unsupported in Windows CNG backend");
#endif /* HAVE_LIBCRYPT32 */
}
/*******************************************************************/
/*
* Windows CNG backend: Cipher functions
*/
int
_libssh2_wincng_cipher_init(_libssh2_cipher_ctx *ctx,
_libssh2_cipher_type(type),
unsigned char *iv,
unsigned char *secret,
int encrypt)
{
BCRYPT_KEY_HANDLE hKey;
BCRYPT_KEY_DATA_BLOB_HEADER *header;
unsigned char *pbKeyObject, *pbIV, *key, *pbCtr, *pbIVCopy;
unsigned long dwKeyObject, dwIV, dwCtrLength, dwBlockLength,
cbData, keylen;
int ret;
(void)encrypt;
ret = BCryptGetProperty(*type.phAlg, BCRYPT_OBJECT_LENGTH,
(unsigned char *)&dwKeyObject,
sizeof(dwKeyObject),
&cbData, 0);
if(!BCRYPT_SUCCESS(ret)) {
return -1;
}
ret = BCryptGetProperty(*type.phAlg, BCRYPT_BLOCK_LENGTH,
(unsigned char *)&dwBlockLength,
sizeof(dwBlockLength),
&cbData, 0);
if(!BCRYPT_SUCCESS(ret)) {
return -1;
}
pbKeyObject = malloc(dwKeyObject);
if(!pbKeyObject) {
return -1;
}
keylen = sizeof(BCRYPT_KEY_DATA_BLOB_HEADER) + type.dwKeyLength;
key = malloc(keylen);
if(!key) {
free(pbKeyObject);
return -1;
}
header = (BCRYPT_KEY_DATA_BLOB_HEADER *)key;
header->dwMagic = BCRYPT_KEY_DATA_BLOB_MAGIC;
header->dwVersion = BCRYPT_KEY_DATA_BLOB_VERSION1;
header->cbKeyData = type.dwKeyLength;
memcpy(key + sizeof(BCRYPT_KEY_DATA_BLOB_HEADER),
secret, type.dwKeyLength);
ret = BCryptImportKey(*type.phAlg, NULL, BCRYPT_KEY_DATA_BLOB, &hKey,
pbKeyObject, dwKeyObject, key, keylen, 0);
_libssh2_wincng_safe_free(key, keylen);
if(!BCRYPT_SUCCESS(ret)) {
_libssh2_wincng_safe_free(pbKeyObject, dwKeyObject);
return -1;
}
pbIV = NULL;
pbCtr = NULL;
dwIV = 0;
dwCtrLength = 0;
if(type.useIV || type.ctrMode) {
pbIVCopy = malloc(dwBlockLength);
if(!pbIVCopy) {
BCryptDestroyKey(hKey);
_libssh2_wincng_safe_free(pbKeyObject, dwKeyObject);
return -1;
}
memcpy(pbIVCopy, iv, dwBlockLength);
if(type.ctrMode) {
pbCtr = pbIVCopy;
dwCtrLength = dwBlockLength;
}
else if(type.useIV) {
pbIV = pbIVCopy;
dwIV = dwBlockLength;
}
}
ctx->hKey = hKey;
ctx->pbKeyObject = pbKeyObject;
ctx->pbIV = pbIV;
ctx->pbCtr = pbCtr;
ctx->dwKeyObject = dwKeyObject;
ctx->dwIV = dwIV;
ctx->dwBlockLength = dwBlockLength;
ctx->dwCtrLength = dwCtrLength;
return 0;
}
int
_libssh2_wincng_cipher_crypt(_libssh2_cipher_ctx *ctx,
_libssh2_cipher_type(type),
int encrypt,
unsigned char *block,
size_t blocklen)
{
unsigned char *pbOutput, *pbInput;
unsigned long cbOutput, cbInput;
int ret;
(void)type;
cbInput = (unsigned long)blocklen;
if(type.ctrMode) {
pbInput = ctx->pbCtr;
}
else {
pbInput = block;
}
if(encrypt || type.ctrMode) {
ret = BCryptEncrypt(ctx->hKey, pbInput, cbInput, NULL,
ctx->pbIV, ctx->dwIV, NULL, 0, &cbOutput, 0);
}
else {
ret = BCryptDecrypt(ctx->hKey, pbInput, cbInput, NULL,
ctx->pbIV, ctx->dwIV, NULL, 0, &cbOutput, 0);
}
if(BCRYPT_SUCCESS(ret)) {
pbOutput = malloc(cbOutput);
if(pbOutput) {
if(encrypt || type.ctrMode) {
ret = BCryptEncrypt(ctx->hKey, pbInput, cbInput, NULL,
ctx->pbIV, ctx->dwIV,
pbOutput, cbOutput, &cbOutput, 0);
}
else {
ret = BCryptDecrypt(ctx->hKey, pbInput, cbInput, NULL,
ctx->pbIV, ctx->dwIV,
pbOutput, cbOutput, &cbOutput, 0);
}
if(BCRYPT_SUCCESS(ret)) {
if(type.ctrMode) {
_libssh2_xor_data(block, block, pbOutput, blocklen);
_libssh2_aes_ctr_increment(ctx->pbCtr, ctx->dwCtrLength);
}
else {
memcpy(block, pbOutput, cbOutput);
}
}
_libssh2_wincng_safe_free(pbOutput, cbOutput);
}
else
ret = STATUS_NO_MEMORY;
}
return BCRYPT_SUCCESS(ret) ? 0 : -1;
}
void
_libssh2_wincng_cipher_dtor(_libssh2_cipher_ctx *ctx)
{
BCryptDestroyKey(ctx->hKey);
ctx->hKey = NULL;
_libssh2_wincng_safe_free(ctx->pbKeyObject, ctx->dwKeyObject);
ctx->pbKeyObject = NULL;
ctx->dwKeyObject = 0;
_libssh2_wincng_safe_free(ctx->pbIV, ctx->dwBlockLength);
ctx->pbIV = NULL;
ctx->dwBlockLength = 0;
_libssh2_wincng_safe_free(ctx->pbCtr, ctx->dwCtrLength);
ctx->pbCtr = NULL;
ctx->dwCtrLength = 0;
}
/*******************************************************************/
/*
* Windows CNG backend: BigNumber functions
*/
_libssh2_bn *
_libssh2_wincng_bignum_init(void)
{
_libssh2_bn *bignum;
bignum = (_libssh2_bn *)malloc(sizeof(_libssh2_bn));
if(bignum) {
bignum->bignum = NULL;
bignum->length = 0;
}
return bignum;
}
static int
_libssh2_wincng_bignum_resize(_libssh2_bn *bn, unsigned long length)
{
unsigned char *bignum;
if(!bn)
return -1;
if(length == bn->length)
return 0;
#ifdef LIBSSH2_CLEAR_MEMORY
if(bn->bignum && bn->length > 0 && length < bn->length) {
SecureZeroMemory(bn->bignum + length, bn->length - length);
}
#endif
bignum = realloc(bn->bignum, length);
if(!bignum)
return -1;
bn->bignum = bignum;
bn->length = length;
return 0;
}
static int
_libssh2_wincng_bignum_rand(_libssh2_bn *rnd, int bits, int top, int bottom)
{
unsigned char *bignum;
unsigned long length;
if(!rnd)
return -1;
length = (unsigned long)(ceil((float)bits / 8) * sizeof(unsigned char));
if(_libssh2_wincng_bignum_resize(rnd, length))
return -1;
bignum = rnd->bignum;
if(_libssh2_wincng_random(bignum, length))
return -1;
/* calculate significant bits in most significant byte */
bits %= 8;
/* fill most significant byte with zero padding */
bignum[0] &= (1 << (8 - bits)) - 1;
/* set some special last bits in most significant byte */
if(top == 0)
bignum[0] |= (1 << (7 - bits));
else if(top == 1)
bignum[0] |= (3 << (6 - bits));
/* make odd by setting first bit in least significant byte */
if(bottom)
bignum[length - 1] |= 1;
return 0;
}
static int
_libssh2_wincng_bignum_mod_exp(_libssh2_bn *r,
_libssh2_bn *a,
_libssh2_bn *p,
_libssh2_bn *m)
{
BCRYPT_KEY_HANDLE hKey;
BCRYPT_RSAKEY_BLOB *rsakey;
unsigned char *key, *bignum;
unsigned long keylen, offset, length;
int ret;
if(!r || !a || !p || !m)
return -1;
offset = sizeof(BCRYPT_RSAKEY_BLOB);
keylen = offset + p->length + m->length;
key = malloc(keylen);
if(!key)
return -1;
/* https://msdn.microsoft.com/library/windows/desktop/aa375531.aspx */
rsakey = (BCRYPT_RSAKEY_BLOB *)key;
rsakey->Magic = BCRYPT_RSAPUBLIC_MAGIC;
rsakey->BitLength = m->length * 8;
rsakey->cbPublicExp = p->length;
rsakey->cbModulus = m->length;
rsakey->cbPrime1 = 0;
rsakey->cbPrime2 = 0;
memcpy(key + offset, p->bignum, p->length);
offset += p->length;
memcpy(key + offset, m->bignum, m->length);
ret = BCryptImportKeyPair(_libssh2_wincng.hAlgRSA, NULL,
BCRYPT_RSAPUBLIC_BLOB, &hKey, key, keylen,
BCRYPT_NO_KEY_VALIDATION);
if(BCRYPT_SUCCESS(ret)) {
ret = BCryptEncrypt(hKey, a->bignum, a->length, NULL, NULL, 0,
NULL, 0, &length, BCRYPT_PAD_NONE);
if(BCRYPT_SUCCESS(ret)) {
if(!_libssh2_wincng_bignum_resize(r, length)) {
length = max(a->length, length);
bignum = malloc(length);
if(bignum) {
offset = length - a->length;
memset(bignum, 0, offset);
memcpy(bignum + offset, a->bignum, a->length);
ret = BCryptEncrypt(hKey, bignum, length, NULL, NULL, 0,
r->bignum, r->length, &offset,
BCRYPT_PAD_NONE);
_libssh2_wincng_safe_free(bignum, length);
if(BCRYPT_SUCCESS(ret)) {
_libssh2_wincng_bignum_resize(r, offset);
}
}
else
ret = STATUS_NO_MEMORY;
}
else
ret = STATUS_NO_MEMORY;
}
BCryptDestroyKey(hKey);
}
_libssh2_wincng_safe_free(key, keylen);
return BCRYPT_SUCCESS(ret) ? 0 : -1;
}
int
_libssh2_wincng_bignum_set_word(_libssh2_bn *bn, unsigned long word)
{
unsigned long offset, number, bits, length;
if(!bn)
return -1;
bits = 0;
number = word;
while(number >>= 1)
bits++;
length = (unsigned long) (ceil(((double)(bits + 1)) / 8.0) *
sizeof(unsigned char));
if(_libssh2_wincng_bignum_resize(bn, length))
return -1;
for(offset = 0; offset < length; offset++)
bn->bignum[offset] = (word >> (offset * 8)) & 0xff;
return 0;
}
unsigned long
_libssh2_wincng_bignum_bits(const _libssh2_bn *bn)
{
unsigned char number;
unsigned long offset, length, bits;
if(!bn)
return 0;
length = bn->length - 1;
offset = 0;
while(!(*(bn->bignum + offset)) && (offset < length))
offset++;
bits = (length - offset) * 8;
number = bn->bignum[offset];
while(number >>= 1)
bits++;
bits++;
return bits;
}
void
_libssh2_wincng_bignum_from_bin(_libssh2_bn *bn, unsigned long len,
const unsigned char *bin)
{
unsigned char *bignum;
unsigned long offset, length, bits;
if(!bn || !bin || !len)
return;
if(_libssh2_wincng_bignum_resize(bn, len))
return;
memcpy(bn->bignum, bin, len);
bits = _libssh2_wincng_bignum_bits(bn);
length = (unsigned long) (ceil(((double)bits) / 8.0) *
sizeof(unsigned char));
offset = bn->length - length;
if(offset > 0) {
memmove(bn->bignum, bn->bignum + offset, length);
#ifdef LIBSSH2_CLEAR_MEMORY
SecureZeroMemory(bn->bignum + length, offset);
#endif
bignum = realloc(bn->bignum, length);
if(bignum) {
bn->bignum = bignum;
bn->length = length;
}
}
}
void
_libssh2_wincng_bignum_to_bin(const _libssh2_bn *bn, unsigned char *bin)
{
if(bin && bn && bn->bignum && bn->length > 0) {
memcpy(bin, bn->bignum, bn->length);
}
}
void
_libssh2_wincng_bignum_free(_libssh2_bn *bn)
{
if(bn) {
if(bn->bignum) {
_libssh2_wincng_safe_free(bn->bignum, bn->length);
bn->bignum = NULL;
}
bn->length = 0;
_libssh2_wincng_safe_free(bn, sizeof(_libssh2_bn));
}
}
/*
* Windows CNG backend: Diffie-Hellman support.
*/
void
_libssh2_dh_init(_libssh2_dh_ctx *dhctx)
{
*dhctx = _libssh2_wincng_bignum_init(); /* Random from client */
}
int
_libssh2_dh_key_pair(_libssh2_dh_ctx *dhctx, _libssh2_bn *public,
_libssh2_bn *g, _libssh2_bn *p, int group_order)
{
/* Generate x and e */
if(_libssh2_wincng_bignum_rand(*dhctx, group_order * 8 - 1, 0, -1))
return -1;
if(_libssh2_wincng_bignum_mod_exp(public, g, *dhctx, p))
return -1;
return 0;
}
int
_libssh2_dh_secret(_libssh2_dh_ctx *dhctx, _libssh2_bn *secret,
_libssh2_bn *f, _libssh2_bn *p)
{
/* Compute the shared secret */
_libssh2_wincng_bignum_mod_exp(secret, f, *dhctx, p);
return 0;
}
void
_libssh2_dh_dtor(_libssh2_dh_ctx *dhctx)
{
_libssh2_wincng_bignum_free(*dhctx);
*dhctx = NULL;
}
#endif /* LIBSSH2_WINCNG */