libgourou/utils/drmprocessorclientimpl.cpp

/*
  Copyright (c) 2021, Grégory Soutadé

  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 its contributors may be used to endorse or promote products
    derived from this software without specific prior written permission.
  
  THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS AND 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 <openssl/rand.h>
#include <openssl/pkcs12.h>
#include <openssl/evp.h>
#include <openssl/err.h>

#include <QCoreApplication>
#include <QNetworkReply>
#include <QNetworkRequest>
#include <QNetworkAccessManager>
#include <QFile>

#include <zip.h>

#include <libgourou_common.h>
#include <libgourou_log.h>
#include "drmprocessorclientimpl.h"

/* Digest interface */
void* DRMProcessorClientImpl::createDigest(const std::string& digestName)
{
    EVP_MD_CTX *sha_ctx = EVP_MD_CTX_new();
    const EVP_MD* md = EVP_get_digestbyname(digestName.c_str());
    EVP_DigestInit(sha_ctx, md);

    return sha_ctx;
}

int DRMProcessorClientImpl::digestUpdate(void* handler, unsigned char* data, unsigned int length)
{
    return EVP_DigestUpdate((EVP_MD_CTX *)handler, data, length);
}

int DRMProcessorClientImpl::digestFinalize(void* handler, unsigned char* digestOut)
{
    int res = EVP_DigestFinal((EVP_MD_CTX *)handler, digestOut, NULL);
    EVP_MD_CTX_free((EVP_MD_CTX *)handler);
    return res;
}

int DRMProcessorClientImpl::digest(const std::string& digestName, unsigned char* data, unsigned int length, unsigned char* digestOut)
{
    void* handler = createDigest(digestName);
    if (!handler)
	return -1;
    if (digestUpdate(handler, data, length))
	return -1;
    return digestFinalize(handler, digestOut);
}

/* Random interface */
void DRMProcessorClientImpl::randBytes(unsigned char* bytesOut, unsigned int length)
{
    RAND_bytes(bytesOut, length);
}

/* HTTP interface */
std::string DRMProcessorClientImpl::sendHTTPRequest(const std::string& URL, const std::string& POSTData, const std::string& contentType)
{
    QNetworkRequest request(QUrl(URL.c_str()));
    QNetworkAccessManager networkManager;
    QByteArray replyData;

    GOUROU_LOG(gourou::INFO, "Send request to " << URL);
    if (POSTData.size())
    {
	GOUROU_LOG(gourou::DEBUG, "<<< " << std::endl << POSTData);
    }
	
    request.setRawHeader("Accept", "*/*");
    request.setRawHeader("User-Agent", "book2png");
    if (contentType.size())
	request.setRawHeader("Content-Type", contentType.c_str());

    QNetworkReply* reply;

    if (POSTData.size())
	reply = networkManager.post(request, POSTData.c_str());
    else
	reply = networkManager.get(request);

    QCoreApplication* app = QCoreApplication::instance();
    networkManager.moveToThread(app->thread());
    while (!reply->isFinished())
	app->processEvents();

    replyData = reply->readAll();
    if (reply->rawHeader("Content-Type") == "application/vnd.adobe.adept+xml")
    {
	GOUROU_LOG(gourou::DEBUG, ">>> " << std::endl << replyData.data());
    }
	
    return std::string(replyData.data(), replyData.length());
}

void DRMProcessorClientImpl::RSAPrivateEncrypt(const unsigned char* RSAKey, unsigned int RSAKeyLength,
					       const RSA_KEY_TYPE keyType, const std::string& password,
					       const unsigned char* data, unsigned dataLength,
					       unsigned char* res)
{
    PKCS12 * pkcs12;
    EVP_PKEY* pkey;
    X509* cert;
    STACK_OF(X509)* ca;
    RSA * rsa;

    pkcs12 = d2i_PKCS12(NULL, &RSAKey, RSAKeyLength);
    if (!pkcs12)
	EXCEPTION(gourou::CLIENT_INVALID_PKCS12, ERR_error_string(ERR_get_error(), NULL));
    PKCS12_parse(pkcs12, password.c_str(), &pkey, &cert, &ca);
    rsa = EVP_PKEY_get1_RSA(pkey);

    int ret = RSA_private_encrypt(dataLength, data, res, rsa, RSA_PKCS1_PADDING);

    if (ret < 0)
	EXCEPTION(gourou::CLIENT_RSA_ERROR, ERR_error_string(ERR_get_error(), NULL));

    if (gourou::logLevel >= gourou::DEBUG)
    {
	printf("Sig : ");
	for(int i=0; i<(int)sizeof(res); i++)
	    printf("%02x ", res[i]);
	printf("\n");
    }
}
			    
void DRMProcessorClientImpl::RSAPublicEncrypt(const unsigned char* RSAKey, unsigned int RSAKeyLength,
					      const RSA_KEY_TYPE keyType,
					      const unsigned char* data, unsigned dataLength,
					      unsigned char* res)
{
    X509 * x509 = d2i_X509(0, &RSAKey, RSAKeyLength);
    if (!x509)
	EXCEPTION(gourou::CLIENT_INVALID_CERTIFICATE, "Invalid certificate");
	
    EVP_PKEY * evpKey = X509_get_pubkey(x509);
    RSA* rsa = EVP_PKEY_get1_RSA(evpKey);
    EVP_PKEY_free(evpKey);

    if (!rsa)
	EXCEPTION(gourou::CLIENT_NO_PRIV_KEY, "No private key in certificate");

    int ret = RSA_public_encrypt(dataLength, data, res, rsa, RSA_PKCS1_PADDING);
    if (ret < 0)
	EXCEPTION(gourou::CLIENT_RSA_ERROR, ERR_error_string(ERR_get_error(), NULL));
}

void* DRMProcessorClientImpl::generateRSAKey(int keyLengthBits)
{
    BIGNUM * bn = BN_new();
    RSA * rsa = RSA_new();
    BN_set_word(bn, 0x10001);
    RSA_generate_key_ex(rsa, keyLengthBits, bn, 0);
    BN_free(bn);

    return rsa;
}

void DRMProcessorClientImpl::destroyRSAHandler(void* handler)
{
    RSA_free((RSA*)handler);
}

void DRMProcessorClientImpl::extractRSAPublicKey(void* handler, unsigned char** keyOut, unsigned int* keyOutLength)
{
    EVP_PKEY * evpKey = EVP_PKEY_new();
    EVP_PKEY_set1_RSA(evpKey, (RSA*)handler);
    X509_PUBKEY *x509_pubkey = 0;
    X509_PUBKEY_set(&x509_pubkey, evpKey);

    *keyOutLength = i2d_X509_PUBKEY(x509_pubkey, keyOut);

    X509_PUBKEY_free(x509_pubkey);
    EVP_PKEY_free(evpKey);
}

void DRMProcessorClientImpl::extractRSAPrivateKey(void* handler, unsigned char** keyOut, unsigned int* keyOutLength)
{
    EVP_PKEY * evpKey = EVP_PKEY_new();
    EVP_PKEY_set1_RSA(evpKey, (RSA*)handler);
    PKCS8_PRIV_KEY_INFO * privKey = EVP_PKEY2PKCS8(evpKey);

    *keyOutLength = i2d_PKCS8_PRIV_KEY_INFO(privKey, keyOut);

    PKCS8_PRIV_KEY_INFO_free(privKey);
    EVP_PKEY_free(evpKey);
}
				 
/* Crypto interface */
void DRMProcessorClientImpl::AESEncrypt(CHAINING_MODE chaining,
					const unsigned char* key, unsigned int keyLength,
					const unsigned char* iv, unsigned int ivLength,
					const unsigned char* dataIn, unsigned int dataInLength,
					unsigned char* dataOut, unsigned int* dataOutLength)
{
    void* handler = AESEncryptInit(chaining, key, keyLength, iv, ivLength);
    AESEncryptUpdate(handler, dataIn, dataInLength, dataOut, dataOutLength);
    AESEncryptFinalize(handler, dataOut+*dataOutLength, dataOutLength);
}

void* DRMProcessorClientImpl::AESEncryptInit(CHAINING_MODE chaining,
					     const unsigned char* key, unsigned int keyLength,
					     const unsigned char* iv, unsigned int ivLength)
{
    EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();

    switch(keyLength)
    {
    case 16:
	switch(chaining)
	{
	case CHAIN_ECB:
	    EVP_EncryptInit_ex(ctx, EVP_aes_128_ecb(), NULL, key, iv);
	    break;
	case CHAIN_CBC:
	    EVP_EncryptInit_ex(ctx, EVP_aes_128_cbc(), NULL, key, iv);
	    break;
	default:
	    EXCEPTION(gourou::CLIENT_BAD_CHAINING, "Unknown chaining mode " << chaining);
	}
	break;
    default:
	EVP_CIPHER_CTX_free(ctx);
	EXCEPTION(gourou::CLIENT_BAD_KEY_SIZE, "Invalid key size " << keyLength);
    }

    return ctx;
}

void* DRMProcessorClientImpl::AESDecryptInit(CHAINING_MODE chaining,
					     const unsigned char* key, unsigned int keyLength,
					     const unsigned char* iv, unsigned int ivLength)
{
    EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();

    switch(keyLength)
    {
    case 16:
	switch(chaining)
	{
	case CHAIN_ECB:
	    EVP_DecryptInit_ex(ctx, EVP_aes_128_ecb(), NULL, key, iv);
	    break;
	case CHAIN_CBC:
	    EVP_DecryptInit_ex(ctx, EVP_aes_128_cbc(), NULL, key, iv);
	    break;
	default:
	    EXCEPTION(gourou::CLIENT_BAD_CHAINING, "Unknown chaining mode " << chaining);
	}
	break;
    default:
	EVP_CIPHER_CTX_free(ctx);
	EXCEPTION(gourou::CLIENT_BAD_KEY_SIZE, "Invalid key size " << keyLength);
    }

    return ctx;
}

void DRMProcessorClientImpl::AESEncryptUpdate(void* handler, const unsigned char* dataIn, unsigned int dataInLength,
		 unsigned char* dataOut, unsigned int* dataOutLength)
{
    EVP_EncryptUpdate((EVP_CIPHER_CTX*)handler, dataOut, (int*)dataOutLength, dataIn, dataInLength);
}

void DRMProcessorClientImpl::AESEncryptFinalize(void* handler,
						unsigned char* dataOut, unsigned int* dataOutLength)
{
    int len;
    EVP_EncryptFinal_ex((EVP_CIPHER_CTX*)handler, dataOut, &len);
    *dataOutLength += len;
    EVP_CIPHER_CTX_free((EVP_CIPHER_CTX*)handler);
}

void DRMProcessorClientImpl::AESDecrypt(CHAINING_MODE chaining,
					const unsigned char* key, unsigned int keyLength,
					const unsigned char* iv, unsigned int ivLength,
					const unsigned char* dataIn, unsigned int dataInLength,
					unsigned char* dataOut, unsigned int* dataOutLength)
{
    void* handler = AESDecryptInit(chaining, key, keyLength, iv, ivLength);
    AESDecryptUpdate(handler, dataIn, dataInLength, dataOut, dataOutLength);
    AESDecryptFinalize(handler, dataOut+*dataOutLength, dataOutLength);
}

void DRMProcessorClientImpl::AESDecryptUpdate(void* handler, const unsigned char* dataIn, unsigned int dataInLength,
					       unsigned char* dataOut, unsigned int* dataOutLength)
{
    EVP_DecryptUpdate((EVP_CIPHER_CTX*)handler, dataOut, (int*)dataOutLength, dataIn, dataInLength);
}

void DRMProcessorClientImpl::AESDecryptFinalize(void* handler, unsigned char* dataOut, unsigned int* dataOutLength)
{
    int len;
    EVP_DecryptFinal_ex((EVP_CIPHER_CTX*)handler, dataOut, &len);
    *dataOutLength += len;
    EVP_CIPHER_CTX_free((EVP_CIPHER_CTX*)handler);
}

void* DRMProcessorClientImpl::zipOpen(const std::string& path)
{
    zip_t* handler = zip_open(path.c_str(), 0, 0);

    if (!handler)
	EXCEPTION(gourou::CLIENT_BAD_ZIP_FILE, "Invalid zip file " << path);

    return handler;
}

std::string DRMProcessorClientImpl::zipReadFile(void* handler, const std::string& path)
{
    std::string res;
    unsigned char* buffer;
    zip_stat_t sb;
    
    if (zip_stat((zip_t *)handler, path.c_str(), 0, &sb) < 0)
	EXCEPTION(gourou::CLIENT_ZIP_ERROR, "Zip error " << zip_strerror((zip_t *)handler));

    if (!(sb.valid & (ZIP_STAT_INDEX|ZIP_STAT_SIZE)))
	EXCEPTION(gourou::CLIENT_ZIP_ERROR, "Required fields missing");
    
    buffer = new unsigned char[sb.size];
    
    zip_file_t *f = zip_fopen_index((zip_t *)handler, sb.index, ZIP_FL_COMPRESSED);

    zip_fread(f, buffer, sb.size);
    zip_fclose(f);

    res = std::string((char*)buffer, sb.size);
    delete[] buffer;
    
    return res;
}

void DRMProcessorClientImpl::zipWriteFile(void* handler, const std::string& path, const std::string& content)
{
    zip_source_t* s = zip_source_buffer((zip_t*)handler, content.c_str(), content.length(), 0);
    if (zip_file_add((zip_t*)handler, path.c_str(), s, ZIP_FL_OVERWRITE|ZIP_FL_ENC_UTF_8) < 0)
    {
	zip_source_free(s);
	EXCEPTION(gourou::CLIENT_ZIP_ERROR, "Zip error " << zip_strerror((zip_t *)handler));
    }
}

void DRMProcessorClientImpl::zipDeleteFile(void* handler, const std::string& path)
{
    zip_int64_t idx = zip_name_locate((zip_t*)handler, path.c_str(), 0);

    if (idx < 0)
	EXCEPTION(gourou::CLIENT_ZIP_ERROR, "No such file " << path.c_str());
    
    if (zip_delete((zip_t*)handler, idx))
	EXCEPTION(gourou::CLIENT_ZIP_ERROR, "Zip error " << zip_strerror((zip_t *)handler));
}

void DRMProcessorClientImpl::zipClose(void* handler)
{
    zip_close((zip_t*)handler);
}