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Use memcpy() instead of casting to load keys

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UBSAN complains about the casting approach because it loads a 64-bit
integer from the defaultKeys string which isn't guaranteed to be 64-bit
aligned, which is undefined behavior.
This commit is contained in:
dongresource 2023-03-11 23:16:09 +01:00
parent a92cfaff25
commit 4825267537
2 changed files with 7 additions and 3 deletions
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5
src/core/CNProtocol.cpp
View File

@ -41,7 +41,8 @@ int CNSocketEncryption::xorData(uint8_t* buffer, uint8_t* key, int size) {
uint64_t CNSocketEncryption::createNewKey(uint64_t uTime, int32_t iv1, int32_t iv2) { uint64_t CNSocketEncryption::createNewKey(uint64_t uTime, int32_t iv1, int32_t iv2) {
uint64_t num = (uint64_t)(iv1 + 1); uint64_t num = (uint64_t)(iv1 + 1);
uint64_t num2 = (uint64_t)(iv2 + 1); uint64_t num2 = (uint64_t)(iv2 + 1);
uint64_t dEKey = (uint64_t)(*(uint64_t*)&defaultKey[0]); uint64_t dEKey;
memcpy(&dEKey, defaultKey, sizeof(dEKey));
return dEKey * (uTime * num * num2); return dEKey * (uTime * num * num2);
} }
@ -65,7 +66,7 @@ CNPacketData::CNPacketData(void *b, uint32_t t, int l, int trnum, void *trs):
// ========================================================[[ CNSocket ]]======================================================== // ========================================================[[ CNSocket ]]========================================================
CNSocket::CNSocket(SOCKET s, struct sockaddr_in &addr, PacketHandler ph): sock(s), sockaddr(addr), pHandler(ph) { CNSocket::CNSocket(SOCKET s, struct sockaddr_in &addr, PacketHandler ph): sock(s), sockaddr(addr), pHandler(ph) {
EKey = (uint64_t)(*(uint64_t*)&CNSocketEncryption::defaultKey[0]); memcpy(&EKey, CNSocketEncryption::defaultKey, sizeof(EKey));
} }
bool CNSocket::sendData(uint8_t* data, int size) { bool CNSocket::sendData(uint8_t* data, int size) {

5
src/servers/CNLoginServer.cpp
View File

@ -209,9 +209,12 @@ void CNLoginServer::login(CNSocket* sock, CNPacketData* data) {
// send the resp in with original key // send the resp in with original key
sock->sendPacket(resp, P_LS2CL_REP_LOGIN_SUCC); sock->sendPacket(resp, P_LS2CL_REP_LOGIN_SUCC);
uint64_t defaultKey;
memcpy(&defaultKey, CNSocketEncryption::defaultKey, sizeof(defaultKey));
// update keys // update keys
sock->setEKey(CNSocketEncryption::createNewKey(resp.uiSvrTime, resp.iCharCount + 1, resp.iSlotNum + 1)); sock->setEKey(CNSocketEncryption::createNewKey(resp.uiSvrTime, resp.iCharCount + 1, resp.iSlotNum + 1));
sock->setFEKey(CNSocketEncryption::createNewKey((uint64_t)(*(uint64_t*)&CNSocketEncryption::defaultKey[0]), login->iClientVerC, 1)); sock->setFEKey(CNSocketEncryption::createNewKey(defaultKey, login->iClientVerC, 1));
DEBUGLOG( DEBUGLOG(
std::cout << "Login Server: Login success. Welcome " << userLogin << " [" << loginSessions[sock].userID << "]" << std::endl; std::cout << "Login Server: Login success. Welcome " << userLogin << " [" << loginSessions[sock].userID << "]" << std::endl;