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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 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 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 lastReceivedSignature[MAXPLAYERS][64]; // Everyone's response to lastChallengeAll
uint8_t involvedInChallenge[MAXPLAYERS][32]; uint8_t knownWhenChallenged[MAXPLAYERS][32]; // Everyone a client saw at the moment a challenge should be initiated
uint8_t knownWhenChallenged[MAXPLAYERS][32];
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 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; tic_t firstconnectattempttime = 0;
@ -1383,6 +1384,17 @@ static void CL_LoadReceivedSavegame(boolean reloading)
// so they know they can resume the game // so they know they can resume the game
netbuffer->packettype = PT_RECEIVEDGAMESTATE; netbuffer->packettype = PT_RECEIVEDGAMESTATE;
HSendPacket(servernode, true, 0, 0); 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) static void CL_ReloadReceivedSavegame(void)
@ -4388,6 +4400,12 @@ static void PT_WillResendGamestate(void)
if (server || cl_redownloadinggamestate) if (server || cl_redownloadinggamestate)
return; 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 // Send back a PT_CANRECEIVEGAMESTATE packet to the server
// so they know they can start sending the game state // so they know they can start sending the game state
netbuffer->packettype = PT_CANRECEIVEGAMESTATE; netbuffer->packettype = PT_CANRECEIVEGAMESTATE;