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-rw-r--r--oox/source/crypto/CryptTools.cxx507
1 files changed, 507 insertions, 0 deletions
diff --git a/oox/source/crypto/CryptTools.cxx b/oox/source/crypto/CryptTools.cxx
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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 <oox/crypto/CryptTools.hxx>
+#include <com/sun/star/uno/RuntimeException.hpp>
+
+#include <config_oox.h>
+
+#if USE_TLS_OPENSSL
+#include <openssl/evp.h>
+#include <openssl/sha.h>
+#include <openssl/hmac.h>
+#endif // USE_TLS_OPENSSL
+
+#if USE_TLS_NSS
+#include <nss.h>
+#include <pk11pub.h>
+#endif // USE_TLS_NSS
+
+namespace oox::crypto {
+
+#if USE_TLS_OPENSSL
+
+#if (OPENSSL_VERSION_NUMBER < 0x10100000L)
+
+static HMAC_CTX *HMAC_CTX_new(void)
+{
+ HMAC_CTX *pContext = new HMAC_CTX;
+ HMAC_CTX_init(pContext);
+ return pContext;
+}
+
+static void HMAC_CTX_free(HMAC_CTX *pContext)
+{
+ HMAC_CTX_cleanup(pContext);
+ delete pContext;
+}
+#endif
+
+namespace
+{
+ struct cipher_delete
+ {
+ void operator()(EVP_CIPHER_CTX* p) { EVP_CIPHER_CTX_free(p); }
+ };
+
+ struct hmac_delete
+ {
+ void operator()(HMAC_CTX* p) { HMAC_CTX_free(p); }
+ };
+}
+
+struct CryptoImpl
+{
+ std::unique_ptr<EVP_CIPHER_CTX, cipher_delete> mpContext;
+ std::unique_ptr<HMAC_CTX, hmac_delete> mpHmacContext;
+
+ CryptoImpl() = default;
+
+ void setupEncryptContext(std::vector<sal_uInt8>& key, std::vector<sal_uInt8>& iv, Crypto::CryptoType eType)
+ {
+ mpContext.reset(EVP_CIPHER_CTX_new());
+ EVP_CIPHER_CTX_init(mpContext.get());
+
+ const EVP_CIPHER* cipher = getCipher(eType);
+ if (cipher == nullptr)
+ return;
+
+ if (iv.empty())
+ EVP_EncryptInit_ex(mpContext.get(), cipher, nullptr, key.data(), nullptr);
+ else
+ EVP_EncryptInit_ex(mpContext.get(), cipher, nullptr, key.data(), iv.data());
+ EVP_CIPHER_CTX_set_padding(mpContext.get(), 0);
+ }
+
+ void setupDecryptContext(std::vector<sal_uInt8>& key, std::vector<sal_uInt8>& iv, Crypto::CryptoType eType)
+ {
+ mpContext.reset(EVP_CIPHER_CTX_new());
+ EVP_CIPHER_CTX_init(mpContext.get());
+
+ const EVP_CIPHER* pCipher = getCipher(eType);
+ if (pCipher == nullptr)
+ return;
+
+ const size_t nMinKeySize = EVP_CIPHER_key_length(pCipher);
+ if (key.size() < nMinKeySize)
+ key.resize(nMinKeySize, 0);
+
+ if (iv.empty())
+ EVP_DecryptInit_ex(mpContext.get(), pCipher, nullptr, key.data(), nullptr);
+ else
+ {
+ const size_t nMinIVSize = EVP_CIPHER_iv_length(pCipher);
+ if (iv.size() < nMinIVSize)
+ iv.resize(nMinIVSize, 0);
+
+ EVP_DecryptInit_ex(mpContext.get(), pCipher, nullptr, key.data(), iv.data());
+ }
+ EVP_CIPHER_CTX_set_padding(mpContext.get(), 0);
+ }
+
+ void setupCryptoHashContext(std::vector<sal_uInt8>& rKey, CryptoHashType eType)
+ {
+ mpHmacContext.reset(HMAC_CTX_new());
+ const EVP_MD* aEvpMd = nullptr;
+ switch (eType)
+ {
+ case CryptoHashType::SHA1:
+ aEvpMd = EVP_sha1(); break;
+ case CryptoHashType::SHA256:
+ aEvpMd = EVP_sha256(); break;
+ case CryptoHashType::SHA512:
+ aEvpMd = EVP_sha512(); break;
+ }
+ HMAC_Init_ex(mpHmacContext.get(), rKey.data(), rKey.size(), aEvpMd, nullptr);
+ }
+
+ ~CryptoImpl()
+ {
+ if (mpContext)
+ EVP_CIPHER_CTX_cleanup(mpContext.get());
+ }
+
+ static const EVP_CIPHER* getCipher(Crypto::CryptoType type)
+ {
+ switch(type)
+ {
+ case Crypto::CryptoType::AES_128_ECB:
+ return EVP_aes_128_ecb();
+ case Crypto::CryptoType::AES_128_CBC:
+ return EVP_aes_128_cbc();
+ case Crypto::CryptoType::AES_256_CBC:
+ return EVP_aes_256_cbc();
+ default:
+ break;
+ }
+ return nullptr;
+ }
+};
+
+#elif USE_TLS_NSS
+
+#define MAX_WRAPPED_KEY_LEN 128
+
+struct CryptoImpl
+{
+ PK11SlotInfo* mSlot;
+ PK11Context* mContext;
+ SECItem* mSecParam;
+ PK11SymKey* mSymKey;
+ PK11Context* mWrapKeyContext;
+ PK11SymKey* mWrapKey;
+
+ CryptoImpl()
+ : mSlot(nullptr)
+ , mContext(nullptr)
+ , mSecParam(nullptr)
+ , mSymKey(nullptr)
+ , mWrapKeyContext(nullptr)
+ , mWrapKey(nullptr)
+ {
+ // Initialize NSS, database functions are not needed
+ NSS_NoDB_Init(nullptr);
+ }
+
+ ~CryptoImpl()
+ {
+ 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("PK11_KeyGen SymKey failure", 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("PK11_CreateContextBySymKey failure", 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("PK11_CipherOp failure", css::uno::Reference<css::uno::XInterface>());
+ }
+
+ if (PK11_Finalize(mWrapKeyContext) != SECSuccess)
+ throw css::uno::RuntimeException("PK11_Finalize failure", 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 setupCryptoContext(std::vector<sal_uInt8>& key, std::vector<sal_uInt8>& iv, Crypto::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 Crypto::CryptoType::AES_128_ECB:
+ mechanism = CKM_AES_ECB;
+ break;
+ case Crypto::CryptoType::AES_128_CBC:
+ mechanism = CKM_AES_CBC;
+ pIvItem = &ivItem;
+ break;
+ case Crypto::CryptoType::AES_256_CBC:
+ mechanism = CKM_AES_CBC;
+ pIvItem = &ivItem;
+ break;
+ default:
+ break;
+ }
+
+ mSlot = PK11_GetBestSlot(mechanism, nullptr);
+
+ if (!mSlot)
+ throw css::uno::RuntimeException("NSS Slot failure", 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("NSS SymKey failure", 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)
+ {
+ 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::SHA512:
+ aMechanism = CKM_SHA512_HMAC;
+ break;
+ }
+
+ mSlot = PK11_GetBestSlot(aMechanism, nullptr);
+
+ if (!mSlot)
+ throw css::uno::RuntimeException("NSS Slot failure", 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("NSS SymKey failure", css::uno::Reference<css::uno::XInterface>());
+
+ SECItem param;
+ param.data = nullptr;
+ param.len = 0;
+ mContext = PK11_CreateContextBySymKey(aMechanism, CKA_SIGN, mSymKey, &param);
+ }
+};
+#else
+struct CryptoImpl
+{};
+#endif
+
+Crypto::Crypto()
+ : mpImpl(std::make_unique<CryptoImpl>())
+{
+}
+
+Crypto::~Crypto()
+{
+}
+
+// DECRYPT
+
+Decrypt::Decrypt(std::vector<sal_uInt8>& key, std::vector<sal_uInt8>& iv, CryptoType type)
+{
+#if USE_TLS_OPENSSL + USE_TLS_NSS == 0
+ (void)key;
+ (void)iv;
+ (void)type;
+#endif
+
+#if USE_TLS_OPENSSL
+ mpImpl->setupDecryptContext(key, iv, type);
+#endif
+
+#if USE_TLS_NSS
+ mpImpl->setupCryptoContext(key, iv, type, CKA_DECRYPT);
+#endif // USE_TLS_NSS
+}
+
+sal_uInt32 Decrypt::update(std::vector<sal_uInt8>& output, std::vector<sal_uInt8>& input, sal_uInt32 inputLength)
+{
+ int outputLength = 0;
+
+#if USE_TLS_OPENSSL + USE_TLS_NSS > 0
+ sal_uInt32 actualInputLength = inputLength == 0 || inputLength > input.size() ? input.size() : inputLength;
+#else
+ (void)output;
+ (void)input;
+ (void)inputLength;
+#endif
+
+#if USE_TLS_OPENSSL
+ (void)EVP_DecryptUpdate(mpImpl->mpContext.get(), output.data(), &outputLength, input.data(), actualInputLength);
+#endif // USE_TLS_OPENSSL
+
+#if USE_TLS_NSS
+ if (!mpImpl->mContext)
+ return 0;
+ (void)PK11_CipherOp(mpImpl->mContext, output.data(), &outputLength, actualInputLength, input.data(), actualInputLength);
+#endif // USE_TLS_NSS
+
+ return static_cast<sal_uInt32>(outputLength);
+}
+
+sal_uInt32 Decrypt::aes128ecb(std::vector<sal_uInt8>& output, std::vector<sal_uInt8>& input, std::vector<sal_uInt8>& key)
+{
+ sal_uInt32 outputLength = 0;
+ std::vector<sal_uInt8> iv;
+ Decrypt crypto(key, iv, Crypto::AES_128_ECB);
+ outputLength = crypto.update(output, input);
+ return outputLength;
+}
+
+// ENCRYPT
+
+Encrypt::Encrypt(std::vector<sal_uInt8>& key, std::vector<sal_uInt8>& iv, CryptoType type)
+{
+#if USE_TLS_OPENSSL + USE_TLS_NSS == 0
+ (void)key;
+ (void)iv;
+ (void)type;
+#endif
+
+#if USE_TLS_OPENSSL
+ mpImpl->setupEncryptContext(key, iv, type);
+#elif USE_TLS_NSS
+ mpImpl->setupCryptoContext(key, iv, type, CKA_ENCRYPT);
+#endif // USE_TLS_NSS
+}
+
+sal_uInt32 Encrypt::update(std::vector<sal_uInt8>& output, std::vector<sal_uInt8>& input, sal_uInt32 inputLength)
+{
+ int outputLength = 0;
+
+#if USE_TLS_OPENSSL + USE_TLS_NSS > 0
+ sal_uInt32 actualInputLength = inputLength == 0 || inputLength > input.size() ? input.size() : inputLength;
+#else
+ (void)output;
+ (void)input;
+ (void)inputLength;
+#endif
+
+#if USE_TLS_OPENSSL
+ (void)EVP_EncryptUpdate(mpImpl->mpContext.get(), output.data(), &outputLength, input.data(), actualInputLength);
+#endif // USE_TLS_OPENSSL
+
+#if USE_TLS_NSS
+ (void)PK11_CipherOp(mpImpl->mContext, output.data(), &outputLength, actualInputLength, input.data(), actualInputLength);
+#endif // USE_TLS_NSS
+
+ return static_cast<sal_uInt32>(outputLength);
+}
+
+// CryptoHash - HMAC
+
+namespace
+{
+
+sal_Int32 getSizeForHashType(CryptoHashType eType)
+{
+ switch (eType)
+ {
+ case CryptoHashType::SHA1: return 20;
+ case CryptoHashType::SHA256: return 32;
+ case CryptoHashType::SHA512: return 64;
+ }
+ return 0;
+}
+
+} // end anonymous namespace
+
+CryptoHash::CryptoHash(std::vector<sal_uInt8>& rKey, CryptoHashType eType)
+ : mnHashSize(getSizeForHashType(eType))
+{
+#if USE_TLS_OPENSSL
+ mpImpl->setupCryptoHashContext(rKey, eType);
+#elif USE_TLS_NSS
+ mpImpl->setupCryptoHashContext(rKey, eType);
+ PK11_DigestBegin(mpImpl->mContext);
+#else
+ (void)rKey;
+#endif
+}
+
+bool CryptoHash::update(std::vector<sal_uInt8>& rInput, sal_uInt32 nInputLength)
+{
+#if USE_TLS_OPENSSL + USE_TLS_NSS > 0
+ sal_uInt32 nActualInputLength = (nInputLength == 0 || nInputLength > rInput.size()) ? rInput.size() : nInputLength;
+#else
+ (void)rInput;
+ (void)nInputLength;
+#endif
+
+#if USE_TLS_OPENSSL
+ return HMAC_Update(mpImpl->mpHmacContext.get(), rInput.data(), nActualInputLength) != 0;
+#elif USE_TLS_NSS
+ return PK11_DigestOp(mpImpl->mContext, rInput.data(), nActualInputLength) == SECSuccess;
+#else
+ return false; // ???
+#endif
+}
+
+std::vector<sal_uInt8> CryptoHash::finalize()
+{
+ std::vector<sal_uInt8> aHash(mnHashSize, 0);
+ unsigned int nSizeWritten;
+#if USE_TLS_OPENSSL
+ (void) HMAC_Final(mpImpl->mpHmacContext.get(), aHash.data(), &nSizeWritten);
+#elif USE_TLS_NSS
+ PK11_DigestFinal(mpImpl->mContext, aHash.data(), &nSizeWritten, aHash.size());
+#endif
+ (void)nSizeWritten;
+
+ return aHash;
+}
+
+} // namespace oox::crypto
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */