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Detect reused entropy

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This commit is contained in:
jl777
2018-11-06 01:10:09 -11:00
parent f66948660d
commit 912ab71c94
1 changed files with 50 additions and 10 deletions
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60
src/cc/dice.cpp
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@@ -94,7 +94,9 @@ WARNING: there is an attack vector that precludes betting any large amounts, it
#include "../compat/endian.h"
static uint256 bettxids[128];
#define MAX_ENTROPYUSED 8192
static uint256 bettxids[MAX_ENTROPYUSED],entropytxids[MAX_ENTROPYUSED][2]; // change to hashtable
struct dicefinish_info
{
@@ -103,6 +105,21 @@ struct dicefinish_info
int32_t iswin;
};
int32_t DiceEntropyUsed(uint256 entropyused,uint256 bettxid)
{
int32_t i;
if ( entropyused == zeroid || bettxid == zeroid )
return(0);
for (i=0; i<MAX_ENTROPYUSED; i++)
if ( entropytxids[i][0] == entropyused )
{
if ( bettxid == entropytxids[i][1] )
return(i+1);
return(-1);
}
return(0);
}
bool mySenddicetransaction(std::string res,uint256 entropyused,uint256 bettxid)
{
CTransaction tx; char str[65];
@@ -115,7 +132,24 @@ bool mySenddicetransaction(std::string res,uint256 entropyused,uint256 bettxid)
if ( myAddtomempool(tx) != 0 )
{
RelayTransaction(tx);
fprintf(stderr,"added to mempool and broadcast entropyused.%s bettxid.%s -> txid.%s\n",entropyused.GetHex().c_str(),bettxid.GetHex().c_str(),tx.GetHash().GetHex().c_str());
if ( DiceEntropyUsed(entropyused,bettxid) == 0 )
{
for (i=0; i<MAX_ENTROPYUSED; i++)
if ( entropytxids[i] == zeroid )
{
entropytxids[i][0] = entropyused;
entropytxids[i][1] = bettxid;
break;
}
if ( i == MAX_ENTROPYUSED )
{
i = (rand() % MAX_ENTROPYUSED);
fprintf(stderr,"entropytxids full, pick rand.%d\n",i);
entropytxids[i][0] = entropyused;
entropytxids[i][1] = bettxid;
}
fprintf(stderr,"added to mempool.[%d] and broadcast entropyused.%s bettxid.%s -> txid.%s\n",i,entropyused.GetHex().c_str(),bettxid.GetHex().c_str(),tx.GetHash().GetHex().c_str());
}
return(true);
} else fprintf(stderr,"error adding to mempool\n");
} else fprintf(stderr,"error decoding hex\n");
@@ -128,7 +162,7 @@ void *dicefinish(void *_ptr)
char str[65],str2[65],name[32]; std::string res; int32_t i,result,duplicate=0; struct dicefinish_info *ptr; uint256 entropyused;
ptr = (struct dicefinish_info *)_ptr;
sleep(3); // wait for bettxid to be in mempool
for (i=0; i<sizeof(bettxids)/sizeof(*bettxids); i++)
for (i=0; i<MAX_ENTROPYUSED; i++)
if ( bettxids[i] == ptr->bettxid )
{
duplicate = 1;
@@ -136,13 +170,13 @@ void *dicefinish(void *_ptr)
}
if ( duplicate == 0 )
{
for (i=0; i<sizeof(bettxids)/sizeof(*bettxids); i++)
for (i=0; i<MAX_ENTROPYUSED; i++)
if ( bettxids[i] == zeroid )
{
bettxids[i] = ptr->bettxid;
break;
}
if ( i == sizeof(bettxids)/sizeof(*bettxids) )
if ( i == MAX_ENTROPYUSED )
bettxids[rand() % i] = ptr->bettxid;
}
unstringbits(name,ptr->sbits);
@@ -510,7 +544,7 @@ bool DiceValidate(struct CCcontract_info *cp,Eval *eval,const CTransaction &tx)
return eval->Invalid("vout[0] != entropy nValue for bet");
else if ( ConstrainVout(tx.vout[1],1,cp->unspendableCCaddr,0) == 0 )
return eval->Invalid("vout[1] constrain violation for bet");
else if ( tx.vout[2].nValue > txfee+maxodds || tx.vout[2].nValue < txfee )
else if ( tx.vout[2].nValue > txfee+maxodds || tx.vout[2].nValue <= txfee )
return eval->Invalid("vout[2] nValue violation for bet");
else if ( eval->GetTxUnconfirmed(vinTx.vin[0].prevout.hash,vinofvinTx,hashBlock) == 0 || vinofvinTx.vout.size() < 1 )
return eval->Invalid("always should find vinofvin.0, but didnt for bet");
@@ -884,7 +918,7 @@ UniValue DiceList()
std::string DiceCreateFunding(uint64_t txfee,char *planstr,int64_t funds,int64_t minbet,int64_t maxbet,int64_t maxodds,int64_t timeoutblocks)
{
CMutableTransaction mtx; uint256 zero; CScript fundingPubKey; CPubKey mypk,dicepk; int64_t a,b,c,d; uint64_t sbits; struct CCcontract_info *cp,C;
if ( funds < 0 || minbet < 0 || maxbet < 0 || maxodds < 1 || maxodds > 9999 || timeoutblocks < 0 || timeoutblocks > 1440 )
if ( funds < 0 || minbet < 0 || maxbet < 0 || maxodds < 2 || maxodds > 9999 || timeoutblocks < 0 || timeoutblocks > 1440 )
{
CCerror = "invalid parameter error";
fprintf(stderr,"%s\n", CCerror.c_str() );
@@ -1071,14 +1105,20 @@ std::string DiceBetFinish(uint256 &entropyused,int32_t *resultp,uint64_t txfee,c
if ( winlosetimeout != 0 ) // dealernode
{
entropyused = hentropyproof;
fprintf(stderr,"set winlosetimeout %d <- %d\n",winlosetimeout,iswin);
if ( DiceEntropyUsed(entropyused,bettxid) < 0 )
{
CCerror = "possible 51% attack to reveal entropy, need to generate cancel tx with proofs";
fprintf(stderr,"%s\n", CCerror.c_str() );
return("");
}
//fprintf(stderr,"set winlosetimeout %d <- %d\n",winlosetimeout,iswin);
if ( (winlosetimeout= iswin) > 0 )
funcid = 'W';
else funcid = 'L';
}
if ( iswin == winlosetimeout ) // dealernode and normal node paths should always get here
{
fprintf(stderr,"iswin.%d matches\n",iswin);
//fprintf(stderr,"iswin.%d matches\n",iswin);
mtx.vin.push_back(CTxIn(bettxid,0,CScript()));
mtx.vin.push_back(CTxIn(bettxid,1,CScript()));
if ( iswin == 0 && funcid != 'L' && funcid != 'W' ) // normal node path
@@ -1098,7 +1138,7 @@ std::string DiceBetFinish(uint256 &entropyused,int32_t *resultp,uint64_t txfee,c
if ( iswin > 0 && funcid != 0 ) // dealernode 'W' or normal node 'T' path
{
odds = (betTx.vout[2].nValue - txfee);
if ( odds < 1 || odds > maxodds )
if ( odds < 2 || odds > maxodds )
{
CCerror = strprintf("illegal odds.%d vs maxodds.%d\n",(int32_t)odds,(int32_t)maxodds);
fprintf(stderr,"%s\n", CCerror.c_str() );