Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 507 insertions, 0 deletions

diff --git a/oox/source/crypto/CryptTools.cxx b/oox/source/crypto/CryptTools.cxx
new file mode 100644
index 000000000..ee68a8a50
--- /dev/null
+++ b/oox/source/crypto/CryptTools.cxx
@@ -0,0 +1,507 @@
+/* -*- 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: */