Merge pull request #2453 from nspcc-dev/check-policy-for-committee-members

Check policy for committee members

pkg/core/native/contract.go

@@ -77,19 +77,17 @@ func NewContracts(cfg config.ProtocolConfiguration) *Contracts {
 
 	gas := newGAS(int64(cfg.InitialGASSupply), cfg.P2PSigExtensions)
 	neo := newNEO()
+	policy := newPolicy()
 	neo.GAS = gas
+	neo.Policy = policy
 	gas.NEO = neo
 	mgmt.NEO = neo
+	policy.NEO = neo
 
 	cs.GAS = gas
 	cs.NEO = neo
-	cs.Contracts = append(cs.Contracts, neo)
-	cs.Contracts = append(cs.Contracts, gas)
-
-	policy := newPolicy()
-	policy.NEO = neo
 	cs.Policy = policy
-	cs.Contracts = append(cs.Contracts, policy)
+	cs.Contracts = append(cs.Contracts, neo, gas, policy)
 
 	desig := newDesignate(cfg.P2PSigExtensions)
 	desig.NEO = neo

pkg/core/native/native_neo.go

@@ -20,17 +20,20 @@ import (
 	"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/nspcc-dev/neo-go/pkg/encoding/bigint"
+	"github.com/nspcc-dev/neo-go/pkg/io"
 	"github.com/nspcc-dev/neo-go/pkg/smartcontract"
 	"github.com/nspcc-dev/neo-go/pkg/smartcontract/callflag"
 	"github.com/nspcc-dev/neo-go/pkg/smartcontract/manifest"
 	"github.com/nspcc-dev/neo-go/pkg/util"
+	"github.com/nspcc-dev/neo-go/pkg/vm/emit"
 	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
 )
 
 // NEO represents NEO native contract.
 type NEO struct {
 	nep17TokenNative
-	GAS *GAS
+	GAS    *GAS
+	Policy *Policy
 
 	// gasPerBlock represents current value of generated gas per block.
 	// It is append-only and doesn't need to be copied when used.
@@ -822,11 +825,14 @@ func (n *NEO) ModifyAccountVotes(acc *state.NEOBalance, d *dao.Simple, value *bi
 
 func (n *NEO) getCandidates(d *dao.Simple, sortByKey bool) ([]keyWithVotes, error) {
 	arr := make([]keyWithVotes, 0)
+	buf := io.NewBufBinWriter()
 	d.Seek(n.ID, storage.SeekRange{Prefix: []byte{prefixCandidate}}, func(k, v []byte) bool {
 		c := new(candidate).FromBytes(v)
-		if c.Registered {
+		emit.CheckSig(buf.BinWriter, k)
+		if c.Registered && !n.Policy.IsBlockedInternal(d, hash.Hash160(buf.Bytes())) {
 			arr = append(arr, keyWithVotes{Key: string(k), Votes: &c.Votes})
 		}
+		buf.Reset()
 		return true
 	})
 

pkg/core/native/native_test/neo_test.go

@@ -49,6 +49,7 @@ func TestNEO_RegisterPrice(t *testing.T) {
 func TestNEO_Vote(t *testing.T) {
 	neoCommitteeInvoker := newNeoCommitteeClient(t, 100_0000_0000)
 	neoValidatorsInvoker := neoCommitteeInvoker.WithSigners(neoCommitteeInvoker.Validator)
+	policyInvoker := neoCommitteeInvoker.CommitteeInvoker(neoCommitteeInvoker.NativeHash(t, nativenames.Policy))
 	e := neoCommitteeInvoker.Executor
 
 	cfg := e.Chain.GetConfig()
@@ -71,23 +72,23 @@ func TestNEO_Vote(t *testing.T) {
 
 	// voters vote for candidates. The aim of this test is to check that voting
 	// reward is proportional to the NEO balance.
-	voters := make([]neotest.Signer, committeeSize)
+	voters := make([]neotest.Signer, committeeSize+1)
 	// referenceAccounts perform the same actions as voters except voting, i.e. we
 	// will transfer the same amount of NEO to referenceAccounts and see how much
 	// GAS they receive for NEO ownership. We need these values to be able to define
 	// how much GAS voters receive for NEO ownership.
-	referenceAccounts := make([]neotest.Signer, committeeSize)
-	candidates := make([]neotest.Signer, committeeSize)
-	for i := 0; i < committeeSize; i++ {
+	referenceAccounts := make([]neotest.Signer, committeeSize+1)
+	candidates := make([]neotest.Signer, committeeSize+1)
+	for i := 0; i < committeeSize+1; i++ {
 		voters[i] = e.NewAccount(t, 10_0000_0000)
 		referenceAccounts[i] = e.NewAccount(t, 10_0000_0000)
 		candidates[i] = e.NewAccount(t, 2000_0000_0000) // enough for one registration
 	}
 	txes := make([]*transaction.Transaction, 0, committeeSize*4-2)
-	for i := 0; i < committeeSize; i++ {
-		transferTx := neoValidatorsInvoker.PrepareInvoke(t, "transfer", e.Validator.ScriptHash(), voters[i].(neotest.SingleSigner).Account().PrivateKey().GetScriptHash(), int64(committeeSize-i)*1000000, nil)
+	for i := 0; i < committeeSize+1; i++ {
+		transferTx := neoValidatorsInvoker.PrepareInvoke(t, "transfer", e.Validator.ScriptHash(), voters[i].(neotest.SingleSigner).Account().PrivateKey().GetScriptHash(), int64(committeeSize+1-i)*1000000, nil)
 		txes = append(txes, transferTx)
-		transferTx = neoValidatorsInvoker.PrepareInvoke(t, "transfer", e.Validator.ScriptHash(), referenceAccounts[i].(neotest.SingleSigner).Account().PrivateKey().GetScriptHash(), int64(committeeSize-i)*1000000, nil)
+		transferTx = neoValidatorsInvoker.PrepareInvoke(t, "transfer", e.Validator.ScriptHash(), referenceAccounts[i].(neotest.SingleSigner).Account().PrivateKey().GetScriptHash(), int64(committeeSize+1-i)*1000000, nil)
 		txes = append(txes, transferTx)
 		if i > 0 {
 			registerTx := neoValidatorsInvoker.WithSigners(candidates[i]).PrepareInvoke(t, "registerCandidate", candidates[i].(neotest.SingleSigner).Account().PrivateKey().PublicKey().Bytes())
@@ -96,6 +97,7 @@ func TestNEO_Vote(t *testing.T) {
 			txes = append(txes, voteTx)
 		}
 	}
+	txes = append(txes, policyInvoker.PrepareInvoke(t, "blockAccount", candidates[len(candidates)-1].(neotest.SingleSigner).Account().PrivateKey().PublicKey().GetScriptHash()))
 	neoValidatorsInvoker.AddNewBlock(t, txes...)
 	for _, tx := range txes {
 		e.CheckHalt(t, tx.Hash(), stackitem.Make(true)) // luckily, both `transfer`, `registerCandidate` and `vote` return boolean values
@@ -137,12 +139,12 @@ func TestNEO_Vote(t *testing.T) {
 	require.EqualValues(t, sortedCandidates, pubs)
 
 	t.Run("check voter rewards", func(t *testing.T) {
-		gasBalance := make([]*big.Int, len(voters))
-		referenceGASBalance := make([]*big.Int, len(referenceAccounts))
-		neoBalance := make([]*big.Int, len(voters))
-		txes = make([]*transaction.Transaction, 0, len(voters))
+		gasBalance := make([]*big.Int, len(voters)-1)
+		referenceGASBalance := make([]*big.Int, len(referenceAccounts)-1)
+		neoBalance := make([]*big.Int, len(voters)-1)
+		txes = make([]*transaction.Transaction, 0, len(voters)-1)
 		var refTxFee int64
-		for i := range voters {
+		for i := range voters[:len(voters)-1] {
 			h := voters[i].ScriptHash()
 			refH := referenceAccounts[i].ScriptHash()
 			gasBalance[i] = e.Chain.GetUtilityTokenBalance(h)
@@ -169,7 +171,7 @@ func TestNEO_Vote(t *testing.T) {
 
 		// GAS increase consists of 2 parts: NEO holding + voting for committee nodes.
 		// Here we check that 2-nd part exists and is proportional to the amount of NEO given.
-		for i := range voters {
+		for i := range voters[:len(voters)-1] {
 			newGAS := e.Chain.GetUtilityTokenBalance(voters[i].ScriptHash())
 			newGAS.Sub(newGAS, gasBalance[i])
 			gasForHold := referenceGASBalance[i]
@@ -197,6 +199,7 @@ func TestNEO_Vote(t *testing.T) {
 	require.NoError(t, err)
 	for i := range pubs {
 		require.NotEqual(t, candidates[0], pubs[i])
+		require.NotEqual(t, candidates[len(candidates)-1], pubs[i])
 	}
 }
 

pkg/crypto/keys/publickey.go

@@ -12,7 +12,6 @@ import (
 
 	"github.com/btcsuite/btcd/btcec"
 	lru "github.com/hashicorp/golang-lru"
-	"github.com/nspcc-dev/neo-go/pkg/core/interop/interopnames"
 	"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
 	"github.com/nspcc-dev/neo-go/pkg/encoding/address"
 	"github.com/nspcc-dev/neo-go/pkg/io"
@@ -319,8 +318,7 @@ func (p *PublicKey) GetVerificationScript() []byte {
 		buf.WriteB(0xAC) // CHECKSIG
 		return buf.Bytes()
 	}
-	emit.Bytes(buf.BinWriter, b)
-	emit.Syscall(buf.BinWriter, interopnames.SystemCryptoCheckSig)
+	emit.CheckSig(buf.BinWriter, b)
 
 	return buf.Bytes()
 }

pkg/vm/emit/emit.go

@@ -219,6 +219,14 @@ func AppCall(w *io.BinWriter, scriptHash util.Uint160, operation string, f callf
 	AppCallNoArgs(w, scriptHash, operation, f)
 }
 
+// CheckSig emits a single-key verification script using given []bytes as a key.
+// It does not check for key correctness, so you can get an invalid script if the
+// data passed is not really a public key.
+func CheckSig(w *io.BinWriter, key []byte) {
+	Bytes(w, key)
+	Syscall(w, interopnames.SystemCryptoCheckSig)
+}
+
 func isInstructionJmp(op opcode.Opcode) bool {
 	return opcode.JMP <= op && op <= opcode.CALLL || op == opcode.ENDTRYL
 }