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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#include <comphelper/crypto/Crypto.hxx>
#include <com/sun/star/uno/RuntimeException.hpp>
#include <sal/types.h>
#include <config_oox.h>
#include <nss.h>
#include <nspr.h>
#include <pk11pub.h>
namespace comphelper
{
namespace
{
#define MAX_WRAPPED_KEY_LEN 128
class CryptoImplementationNSS : public ICryptoImplementation
{
PK11SlotInfo* mSlot;
PK11Context* mContext;
SECItem* mSecParam;
PK11SymKey* mSymKey;
PK11Context* mWrapKeyContext;
PK11SymKey* mWrapKey;
public:
CryptoImplementationNSS()
: mSlot(nullptr)
, mContext(nullptr)
, mSecParam(nullptr)
, mSymKey(nullptr)
, mWrapKeyContext(nullptr)
, mWrapKey(nullptr)
{
// Initialize NSS, database functions are not needed
if (!NSS_IsInitialized())
{
auto const e = NSS_NoDB_Init(nullptr);
if (e != SECSuccess)
{
PRErrorCode error = PR_GetError();
const char* errorText = PR_ErrorToName(error);
throw css::uno::RuntimeException(
"NSS_NoDB_Init failed with "
+ OUString(errorText, strlen(errorText), RTL_TEXTENCODING_UTF8) + " ("
+ OUString::number(static_cast<int>(error)) + ")");
}
}
}
virtual ~CryptoImplementationNSS()
{
if (mContext)
PK11_DestroyContext(mContext, PR_TRUE);
if (mSecParam)
SECITEM_FreeItem(mSecParam, PR_TRUE);
if (mSymKey)
PK11_FreeSymKey(mSymKey);
if (mWrapKeyContext)
PK11_DestroyContext(mWrapKeyContext, PR_TRUE);
if (mWrapKey)
PK11_FreeSymKey(mWrapKey);
if (mSlot)
PK11_FreeSlot(mSlot);
}
PK11SymKey* ImportSymKey(CK_MECHANISM_TYPE mechanism, CK_ATTRIBUTE_TYPE operation, SECItem* key)
{
mSymKey = PK11_ImportSymKey(mSlot, mechanism, PK11_OriginUnwrap, operation, key, nullptr);
if (!mSymKey) //rhbz#1614419 maybe failed due to FIPS, use rhbz#1461450 style workaround
{
/*
* Without FIPS it would be possible to just use
* mSymKey = PK11_ImportSymKey( mSlot, mechanism, PK11_OriginUnwrap, CKA_ENCRYPT, &keyItem, nullptr );
* with FIPS NSS Level 2 certification has to be "workarounded" (so it becomes Level 1) by using
* following method:
* 1. Generate wrap key
* 2. Encrypt authkey with wrap key
* 3. Unwrap encrypted authkey using wrap key
*/
/*
* Generate wrapping key
*/
CK_MECHANISM_TYPE wrap_mechanism = PK11_GetBestWrapMechanism(mSlot);
int wrap_key_len = PK11_GetBestKeyLength(mSlot, wrap_mechanism);
mWrapKey = PK11_KeyGen(mSlot, wrap_mechanism, nullptr, wrap_key_len, nullptr);
if (!mWrapKey)
throw css::uno::RuntimeException(u"PK11_KeyGen SymKey failure"_ustr,
css::uno::Reference<css::uno::XInterface>());
/*
* Encrypt authkey with wrapping key
*/
/*
* Initialization of IV is not needed because PK11_GetBestWrapMechanism should return ECB mode
*/
SECItem tmp_sec_item = {};
mWrapKeyContext
= PK11_CreateContextBySymKey(wrap_mechanism, CKA_ENCRYPT, mWrapKey, &tmp_sec_item);
if (!mWrapKeyContext)
throw css::uno::RuntimeException(u"PK11_CreateContextBySymKey failure"_ustr,
css::uno::Reference<css::uno::XInterface>());
unsigned char wrapped_key_data[MAX_WRAPPED_KEY_LEN];
int wrapped_key_len = sizeof(wrapped_key_data);
if (PK11_CipherOp(mWrapKeyContext, wrapped_key_data, &wrapped_key_len,
sizeof(wrapped_key_data), key->data, key->len)
!= SECSuccess)
{
throw css::uno::RuntimeException(u"PK11_CipherOp failure"_ustr,
css::uno::Reference<css::uno::XInterface>());
}
if (PK11_Finalize(mWrapKeyContext) != SECSuccess)
throw css::uno::RuntimeException(u"PK11_Finalize failure"_ustr,
css::uno::Reference<css::uno::XInterface>());
/*
* Finally unwrap sym key
*/
SECItem wrapped_key = {};
wrapped_key.data = wrapped_key_data;
wrapped_key.len = wrapped_key_len;
mSymKey = PK11_UnwrapSymKey(mWrapKey, wrap_mechanism, &tmp_sec_item, &wrapped_key,
mechanism, operation, key->len);
}
return mSymKey;
}
void setupEncryptContext(std::vector<sal_uInt8>& key, std::vector<sal_uInt8>& iv,
CryptoType type) override
{
setupCryptoContext(key, iv, type, CKA_ENCRYPT);
}
void setupDecryptContext(std::vector<sal_uInt8>& key, std::vector<sal_uInt8>& iv,
CryptoType type) override
{
setupCryptoContext(key, iv, type, CKA_DECRYPT);
}
void setupCryptoContext(std::vector<sal_uInt8>& key, std::vector<sal_uInt8>& iv,
CryptoType type, CK_ATTRIBUTE_TYPE operation)
{
CK_MECHANISM_TYPE mechanism = static_cast<CK_ULONG>(-1);
SECItem ivItem;
ivItem.type = siBuffer;
if (iv.empty())
ivItem.data = nullptr;
else
ivItem.data = iv.data();
ivItem.len = iv.size();
SECItem* pIvItem = nullptr;
switch (type)
{
case CryptoType::AES_128_ECB:
case CryptoType::AES_256_ECB:
mechanism = CKM_AES_ECB;
break;
case CryptoType::AES_128_CBC:
mechanism = CKM_AES_CBC;
pIvItem = &ivItem;
break;
case CryptoType::AES_256_CBC:
mechanism = CKM_AES_CBC;
pIvItem = &ivItem;
break;
default:
break;
}
mSlot = PK11_GetBestSlot(mechanism, nullptr);
if (!mSlot)
throw css::uno::RuntimeException(u"NSS Slot failure"_ustr,
css::uno::Reference<css::uno::XInterface>());
SECItem keyItem;
keyItem.type = siBuffer;
keyItem.data = key.data();
keyItem.len = key.size();
mSymKey = ImportSymKey(mechanism, CKA_ENCRYPT, &keyItem);
if (!mSymKey)
throw css::uno::RuntimeException(u"NSS SymKey failure"_ustr,
css::uno::Reference<css::uno::XInterface>());
mSecParam = PK11_ParamFromIV(mechanism, pIvItem);
mContext = PK11_CreateContextBySymKey(mechanism, operation, mSymKey, mSecParam);
}
void setupCryptoHashContext(std::vector<sal_uInt8>& rKey, CryptoHashType eType) override
{
CK_MECHANISM_TYPE aMechanism = static_cast<CK_ULONG>(-1);
switch (eType)
{
case CryptoHashType::SHA1:
aMechanism = CKM_SHA_1_HMAC;
break;
case CryptoHashType::SHA256:
aMechanism = CKM_SHA256_HMAC;
break;
case CryptoHashType::SHA384:
aMechanism = CKM_SHA384_HMAC;
break;
case CryptoHashType::SHA512:
aMechanism = CKM_SHA512_HMAC;
break;
}
mSlot = PK11_GetBestSlot(aMechanism, nullptr);
if (!mSlot)
throw css::uno::RuntimeException(u"NSS Slot failure"_ustr,
css::uno::Reference<css::uno::XInterface>());
SECItem aKeyItem;
aKeyItem.data = rKey.data();
aKeyItem.len = rKey.size();
mSymKey = ImportSymKey(aMechanism, CKA_SIGN, &aKeyItem);
if (!mSymKey)
throw css::uno::RuntimeException(u"NSS SymKey failure"_ustr,
css::uno::Reference<css::uno::XInterface>());
SECItem param;
param.data = nullptr;
param.len = 0;
mContext = PK11_CreateContextBySymKey(aMechanism, CKA_SIGN, mSymKey, ¶m);
// Also call digest to begin
PK11_DigestBegin(mContext);
}
sal_uInt32 decryptUpdate(std::vector<sal_uInt8>& output, std::vector<sal_uInt8>& input,
sal_uInt32 inputLength) override
{
if (!mContext)
return 0;
int outputLength = 0;
(void)PK11_CipherOp(mContext, output.data(), &outputLength, inputLength, input.data(),
inputLength);
return outputLength;
}
sal_uInt32 encryptUpdate(std::vector<sal_uInt8>& output, std::vector<sal_uInt8>& input,
sal_uInt32 inputLength) override
{
if (!mContext)
return 0;
int outputLength = 0;
(void)PK11_CipherOp(mContext, output.data(), &outputLength, inputLength, input.data(),
inputLength);
return outputLength;
}
bool cryptoHashUpdate(std::vector<sal_uInt8>& rInput, sal_uInt32 nInputLength) override
{
return PK11_DigestOp(mContext, rInput.data(), nInputLength) == SECSuccess;
}
bool cryptoHashFinalize(std::vector<sal_uInt8>& rHash) override
{
unsigned int nSizeWritten = 0;
PK11_DigestFinal(mContext, rHash.data(), &nSizeWritten, rHash.size());
return nSizeWritten == rHash.size();
}
};
} // anonymous namespace
std::shared_ptr<ICryptoImplementation> ICryptoImplementation::createInstance()
{
return std::shared_ptr<ICryptoImplementation>(new CryptoImplementationNSS);
}
} // namespace comphelper
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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