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Check for pubkey modifiation when gamestate is resent

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AJ Martinez 2023-03-20 23:23:20 -07:00 • committed by James R
parent 33760dec51
commit 25e9207fa2
1 changed files with 20 additions and 2 deletions
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22
src/d_clisrv.c
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@ -168,8 +168,9 @@ uint8_t lastReceivedKey[MAXNETNODES][MAXSPLITSCREENPLAYERS][32]; // Player's pub
uint8_t lastSentChallenge[MAXNETNODES][MAXSPLITSCREENPLAYERS][32]; // The random message we asked them to sign in PT_SERVERCHALLENGE, check it in PT_CLIENTJOIN
uint8_t lastChallengeAll[32]; // The message we asked EVERYONE to sign for client-to-client identity proofs
uint8_t lastReceivedSignature[MAXPLAYERS][64]; // Everyone's response to lastChallengeAll
uint8_t involvedInChallenge[MAXPLAYERS][32];
uint8_t knownWhenChallenged[MAXPLAYERS][32];
uint8_t knownWhenChallenged[MAXPLAYERS][32]; // Everyone a client saw at the moment a challenge should be initiated
uint8_t priorGamestateKeySave[MAXPLAYERS][32]; // Make a note of keys before consuming a new gamestate, and if the server tries to send us a gamestate where keys differ, assume shenanigans
boolean serverisfull = false; //lets us be aware if the server was full after we check files, but before downloading, so we can ask if the user still wants to download or not
tic_t firstconnectattempttime = 0;
@ -1383,6 +1384,17 @@ static void CL_LoadReceivedSavegame(boolean reloading)
// so they know they can resume the game
netbuffer->packettype = PT_RECEIVEDGAMESTATE;
HSendPacket(servernode, true, 0, 0);
int i;
for (i = 0; i < MAXPLAYERS; i++)
{
if (memcmp(priorGamestateKeySave[i], players[i].public_key, sizeof(priorGamestateKeySave[i])) != 0)
{
CONS_Printf("New gamestate has different public keys, shenanigans afoot?");
// TODO: Actually do something in this situation
break;
}
}
}
static void CL_ReloadReceivedSavegame(void)
@ -4388,6 +4400,12 @@ static void PT_WillResendGamestate(void)
if (server || cl_redownloadinggamestate)
return;
int i;
for (i = 0; i < MAXPLAYERS; i++)
{
memcpy(priorGamestateKeySave[i], players[i].public_key, sizeof(priorGamestateKeySave[i]));
}
// Send back a PT_CANRECEIVEGAMESTATE packet to the server
// so they know they can start sending the game state
netbuffer->packettype = PT_CANRECEIVEGAMESTATE;