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Diffstat (limited to '')
| -rw-r--r-- | oox/source/crypto/CryptTools.cxx | 483 |
1 files changed, 483 insertions, 0 deletions
diff --git a/oox/source/crypto/CryptTools.cxx b/oox/source/crypto/CryptTools.cxx new file mode 100644 index 000000000..ff11ebbc0 --- /dev/null +++ b/oox/source/crypto/CryptTools.cxx @@ -0,0 +1,483 @@ +/* -*- 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 +struct CryptoImpl +{ + std::unique_ptr<EVP_CIPHER_CTX> mpContext; + std::unique_ptr<HMAC_CTX> mpHmacContext; + + CryptoImpl() = default; + + void setupEncryptContext(std::vector<sal_uInt8>& key, std::vector<sal_uInt8>& iv, Crypto::CryptoType eType) + { + mpContext.reset(new EVP_CIPHER_CTX); + 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(), 0); + 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(new EVP_CIPHER_CTX); + 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(), 0); + 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(new HMAC_CTX); + HMAC_CTX_init(mpHmacContext.get()); + const EVP_MD* aEvpMd; + 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(mpHmacContext.get(), rKey.data(), rKey.size(), aEvpMd); + } + + ~CryptoImpl() + { + if (mpContext) + EVP_CIPHER_CTX_cleanup(mpContext.get()); + if (mpHmacContext) + HMAC_CTX_cleanup(mpHmacContext.get()); + } + + 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, ¶m); + } +}; +#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) + : Crypto() +{ +#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) + : Crypto() +{ +#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) + : Crypto() + , 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: */ |