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Don't sigcheck game traffic if you're not the server, you can't do anything with it

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AJ Martinez 2023-03-19 21:28:10 -07:00 • committed by James R
parent ca767a554b
commit a1b0625f66
1 changed files with 33 additions and 30 deletions
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63
src/d_clisrv.c
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@ -4689,42 +4689,45 @@ static void HandlePacketFromPlayer(SINT8 node)
I_Error("bad table nodetoplayer: node %d player %d", doomcom->remotenode, netconsole);
#endif
uint8_t allzero[32];
memset(allzero, 0, sizeof(allzero));
int splitnodes;
if (IsPacketSigned(netbuffer->packettype))
if (server)
{
for (splitnodes = 0; splitnodes < MAXSPLITSCREENPLAYERS; splitnodes++)
uint8_t allzero[32];
memset(allzero, 0, sizeof(allzero));
int splitnodes;
if (IsPacketSigned(netbuffer->packettype))
{
// Don't try to enforce signatures for players that aren't present.
if (splitnodes > 0 && nodetoplayer2[node] <= 0)
break;
if (splitnodes > 1 && nodetoplayer3[node] <= 0)
break;
if (splitnodes > 2 && nodetoplayer4[node] <= 0)
break;
for (splitnodes = 0; splitnodes < MAXSPLITSCREENPLAYERS; splitnodes++)
{
// Don't try to enforce signatures for players that aren't present.
if (splitnodes > 0 && nodetoplayer2[node] <= 0)
break;
if (splitnodes > 1 && nodetoplayer3[node] <= 0)
break;
if (splitnodes > 2 && nodetoplayer4[node] <= 0)
break;
const void* message = &netbuffer->u;
if (memcmp(allzero, lastReceivedKey[node][splitnodes], sizeof(allzero)) == 0)
{
//CONS_Printf("Throwing out a guest signature from node %d player %d\n", node, splitnodes);
}
else
{
if (crypto_eddsa_check(netbuffer->signature[splitnodes], lastReceivedKey[node][splitnodes], message, doomcom->datalength - BASEPACKETSIZE))
const void* message = &netbuffer->u;
if (memcmp(allzero, lastReceivedKey[node][splitnodes], sizeof(allzero)) == 0)
{
CONS_Alert(CONS_ERROR, "SIGFAIL! Packet type %d from node %d player %d\nkey %s size %d netconsole %d\n",
netbuffer->packettype, node, splitnodes,
GetPrettyRRID(lastReceivedKey[node][splitnodes], true), doomcom->datalength - BASEPACKETSIZE, netconsole);
if (netconsole != -1) // NO IDEA.
SendKick(netconsole, KICK_MSG_SIGFAIL);
// Net_CloseConnection(node);
// nodeingame[node] = false;
return;
//CONS_Printf("Throwing out a guest signature from node %d player %d\n", node, splitnodes);
}
else
{
if (crypto_eddsa_check(netbuffer->signature[splitnodes], lastReceivedKey[node][splitnodes], message, doomcom->datalength - BASEPACKETSIZE))
{
CONS_Alert(CONS_ERROR, "SIGFAIL! Packet type %d from node %d player %d\nkey %s size %d netconsole %d\n",
netbuffer->packettype, node, splitnodes,
GetPrettyRRID(lastReceivedKey[node][splitnodes], true), doomcom->datalength - BASEPACKETSIZE, netconsole);
if (netconsole != -1) // NO IDEA.
SendKick(netconsole, KICK_MSG_SIGFAIL);
// Net_CloseConnection(node);
// nodeingame[node] = false;
return;
}
}
}
}
}
}