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#include "stdafx.h"
enum
{
SQL_CRYPT_GET_MODE,
SQL_CRYPT_SET_MODE,
SQL_CRYPT_GET_PROVIDER,
SQL_CRYPT_SET_PROVIDER,
SQL_CRYPT_GET_KEY,
SQL_CRYPT_SET_KEY,
SQL_CRYPT_ENCRYPT,
SQL_CRYPT_ENCRYPT2,
};
static CQuery crypto_stmts[] =
{
{ "SELECT data FROM crypto WHERE id=1;" }, // SQL_CRYPT_GET_MODE
{ "REPLACE INTO crypto VALUES (1, ?);" }, // SQL_CRYPT_SET_MODE
{ "SELECT data FROM crypto WHERE id=2;" }, // SQL_CRYPT_GET_PROVIDER
{ "REPLACE INTO crypto VALUES(2, ?);" }, // SQL_CRYPT_SET_PROVIDER
{ "SELECT data FROM crypto WHERE id=3;" }, // SQL_CRYPT_GET_KEY
{ "REPLACE INTO crypto VALUES(3, ?);" }, // SQL_CRYPT_SET_KEY
{ "UPDATE events SET flags=?, data=? WHERE id=?;"}, // SQL_CRYPT_ENCRYPT
{ "UPDATE settings SET type=?, value=? WHERE contact_id=? AND module=? AND setting=?;"}, // SQL_CRYPT_ENCRYPT2
};
static char szCreateQuery[] =
"CREATE TABLE crypto (id INTEGER NOT NULL PRIMARY KEY, data ANY NOT NULL);\r\n"
"INSERT INTO crypto VALUES (1, 0), (2, 'AES (Rjindale)'), (3, (SELECT value FROM settings WHERE contact_id=0 AND module='CryptoEngine' AND setting='StoredKey'));\r\n"
"DELETE FROM settings WHERE contact_id=0 AND module='CryptoEngine';\r\n";
void CDbxSQLite::InitEncryption()
{
int rc = sqlite3_exec(m_db, "SELECT COUNT(1) FROM crypto;", nullptr, nullptr, nullptr);
if (rc == SQLITE_ERROR) // table doesn't exist, fill it with existing data
sqlite3_exec(m_db, szCreateQuery, nullptr, nullptr, nullptr);
for (auto &it : crypto_stmts)
sqlite3_prepare_v3(m_db, it.szQuery, -1, SQLITE_PREPARE_PERSISTENT, &it.pQuery, nullptr);
}
void CDbxSQLite::UninintEncryption()
{
for (auto &it : crypto_stmts)
sqlite3_finalize(it.pQuery);
}
/////////////////////////////////////////////////////////////////////////////////////////
// Saving encryption key in a database
STDMETHODIMP_(BOOL) CDbxSQLite::ReadCryptoKey(MBinBuffer &buf)
{
mir_cslock lock(m_csDbAccess);
sqlite3_stmt *stmt = crypto_stmts[SQL_CRYPT_GET_KEY].pQuery;
int rc = sqlite3_step(stmt);
logError(rc, __FILE__, __LINE__);
if (rc != SQLITE_ROW) {
sqlite3_reset(stmt);
return FALSE;
}
buf.append((BYTE*)sqlite3_column_blob(stmt, 0), sqlite3_column_bytes(stmt, 0));
sqlite3_reset(stmt);
return TRUE;
}
STDMETHODIMP_(BOOL) CDbxSQLite::StoreCryptoKey()
{
size_t iKeyLength = m_crypto->getKeyLength();
BYTE *pKey = (BYTE*)_alloca(iKeyLength);
m_crypto->getKey(pKey, iKeyLength);
mir_cslock lock(m_csDbAccess);
sqlite3_stmt *stmt = crypto_stmts[SQL_CRYPT_SET_KEY].pQuery;
sqlite3_bind_blob(stmt, 1, pKey, (int)iKeyLength, nullptr);
int rc = sqlite3_step(stmt);
logError(rc, __FILE__, __LINE__);
sqlite3_reset(stmt);
SecureZeroMemory(pKey, iKeyLength);
DBFlush();
return TRUE;
}
/////////////////////////////////////////////////////////////////////////////////////////
// Reads encryption flag
STDMETHODIMP_(BOOL) CDbxSQLite::ReadEncryption()
{
mir_cslock lock(m_csDbAccess);
sqlite3_stmt *stmt = crypto_stmts[SQL_CRYPT_GET_MODE].pQuery;
int rc = sqlite3_step(stmt);
logError(rc, __FILE__, __LINE__);
if (rc != SQLITE_ROW) {
sqlite3_reset(stmt);
return FALSE;
}
int ret = sqlite3_column_int(stmt, 0);
sqlite3_reset(stmt);
return ret;
}
/////////////////////////////////////////////////////////////////////////////////////////
// Reads crypto provider's name
STDMETHODIMP_(CRYPTO_PROVIDER*) CDbxSQLite::ReadProvider()
{
mir_cslock lock(m_csDbAccess);
sqlite3_stmt *stmt = crypto_stmts[SQL_CRYPT_GET_PROVIDER].pQuery;
int rc = sqlite3_step(stmt);
logError(rc, __FILE__, __LINE__);
sqlite3_reset(stmt);
return (rc != SQLITE_ROW) ? nullptr : Crypto_GetProvider((char*)sqlite3_column_text(stmt, 0));
}
STDMETHODIMP_(BOOL) CDbxSQLite::StoreProvider(CRYPTO_PROVIDER *pProvider)
{
mir_cslock lock(m_csDbAccess);
sqlite3_stmt *stmt = crypto_stmts[SQL_CRYPT_SET_PROVIDER].pQuery;
sqlite3_bind_text(stmt, 1, pProvider->pszName, (int)strlen(pProvider->pszName), 0);
int rc = sqlite3_step(stmt);
logError(rc, __FILE__, __LINE__);
sqlite3_reset(stmt);
DBFlush();
return TRUE;
}
/////////////////////////////////////////////////////////////////////////////////////////
// Toggles full/partial encryption mode
STDMETHODIMP_(BOOL) CDbxSQLite::EnableEncryption(BOOL bEncrypt)
{
if (m_bEncrypted == (bEncrypt != 0))
return TRUE;
mir_cslock lock(m_csDbAccess);
// encrypt all histories
sqlite3_stmt *stmt = nullptr;
int rc = sqlite3_prepare_v2(m_db, "SELECT id, flags, data FROM events;", -1, &stmt, 0);
logError(rc, __FILE__, __LINE__);
while (sqlite3_step(stmt) == SQLITE_ROW) {
int dwFlags = sqlite3_column_int(stmt, 1);
if (((dwFlags & DBEF_ENCRYPTED) != 0) == bEncrypt)
continue;
int id = sqlite3_column_int(stmt, 0);
auto *pBlob = (const BYTE *)sqlite3_column_blob(stmt, 2);
unsigned cbBlob = sqlite3_column_bytes(stmt, 2);
mir_ptr<BYTE> pNewBlob;
size_t nNewBlob;
if (dwFlags & DBEF_ENCRYPTED) {
pNewBlob = (BYTE*)m_crypto->decodeBuffer(pBlob, cbBlob, &nNewBlob);
dwFlags &= (~DBEF_ENCRYPTED);
}
else {
pNewBlob = m_crypto->encodeBuffer(pBlob, cbBlob, &nNewBlob);
dwFlags |= DBEF_ENCRYPTED;
}
sqlite3_stmt *upd = crypto_stmts[SQL_CRYPT_ENCRYPT].pQuery;
sqlite3_bind_int(upd, 1, dwFlags);
sqlite3_bind_blob(upd, 2, pNewBlob, (int)nNewBlob, 0);
sqlite3_bind_int(upd, 3, id);
rc = sqlite3_step(upd);
logError(rc, __FILE__, __LINE__);
sqlite3_reset(upd);
}
sqlite3_finalize(stmt);
DBFlush(true);
// if database is encrypted, decrypt all settings with type = DBVT_ENCRYPTED
CMStringA query(FORMAT, "SELECT contact_id, module, setting, value FROM settings WHERE type=%d", (bEncrypt) ? DBVT_UTF8 : DBVT_ENCRYPTED);
rc = sqlite3_prepare_v2(m_db, query, -1, &stmt, 0);
logError(rc, __FILE__, __LINE__);
while (sqlite3_step(stmt) == SQLITE_ROW) {
int hContact = sqlite3_column_int(stmt, 0);
auto *pszModule = (char *)sqlite3_column_text(stmt, 1);
auto *pszSetting = (char *)sqlite3_column_text(stmt, 2);
// all passwords etc should remain encrypted
if (!bEncrypt && IsSettingEncrypted(pszModule, pszSetting))
continue;
sqlite3_stmt *upd = crypto_stmts[SQL_CRYPT_ENCRYPT2].pQuery;
sqlite3_bind_int(upd, 1, (bEncrypt) ? DBVT_ENCRYPTED : DBVT_UTF8);
size_t resultLen;
ptrA pBuf;
if (bEncrypt) {
pBuf = (char*)m_crypto->encodeString((char*)sqlite3_column_text(stmt, 3), &resultLen);
sqlite3_bind_blob(upd, 2, pBuf, (int)resultLen, 0);
}
else {
pBuf = (char*)m_crypto->decodeString(sqlite3_column_text(stmt, 3), sqlite3_column_bytes(stmt, 3), &resultLen);
sqlite3_bind_text(upd, 2, pBuf, (int)strlen(pBuf), 0);
}
sqlite3_bind_int(upd, 3, hContact);
sqlite3_bind_text(upd, 4, pszModule, (int)strlen(pszModule), 0);
sqlite3_bind_text(upd, 5, pszSetting, (int)strlen(pszSetting), 0);
rc = sqlite3_step(upd);
logError(rc, __FILE__, __LINE__);
sqlite3_reset(upd);
}
// Finally update flag
stmt = crypto_stmts[SQL_CRYPT_SET_MODE].pQuery;
sqlite3_bind_int(stmt, 1, bEncrypt);
rc = sqlite3_step(stmt);
logError(rc, __FILE__, __LINE__);
sqlite3_reset(stmt);
DBFlush(true);
m_bEncrypted = bEncrypt;
return TRUE;
}
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