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msgvalidation.go
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msgvalidation.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package validation
import (
"bytes"
"github.com/mcc-github/blockchain-protos-go/common"
pb "github.com/mcc-github/blockchain-protos-go/peer"
"github.com/mcc-github/blockchain/common/flogging"
mspmgmt "github.com/mcc-github/blockchain/msp/mgmt"
"github.com/mcc-github/blockchain/protoutil"
"github.com/pkg/errors"
)
var putilsLogger = flogging.MustGetLogger("protoutils")
func checkSignatureFromCreator(creatorBytes []byte, sig []byte, msg []byte, ChainID string) error {
putilsLogger.Debugf("begin")
if creatorBytes == nil || sig == nil || msg == nil {
return errors.New("nil arguments")
}
mspObj := mspmgmt.GetIdentityDeserializer(ChainID)
if mspObj == nil {
return errors.Errorf("could not get msp for channel [%s]", ChainID)
}
creator, err := mspObj.DeserializeIdentity(creatorBytes)
if err != nil {
return errors.WithMessage(err, "MSP error")
}
putilsLogger.Debugf("creator is %s", creator.GetIdentifier())
err = creator.Validate()
if err != nil {
return errors.WithMessage(err, "creator certificate is not valid")
}
putilsLogger.Debugf("creator is valid")
err = creator.Verify(msg, sig)
if err != nil {
return errors.WithMessage(err, "creator's signature over the proposal is not valid")
}
putilsLogger.Debugf("exits successfully")
return nil
}
func validateSignatureHeader(sHdr *common.SignatureHeader) error {
if sHdr == nil {
return errors.New("nil SignatureHeader provided")
}
if sHdr.Nonce == nil || len(sHdr.Nonce) == 0 {
return errors.New("invalid nonce specified in the header")
}
if sHdr.Creator == nil || len(sHdr.Creator) == 0 {
return errors.New("invalid creator specified in the header")
}
return nil
}
func validateChannelHeader(cHdr *common.ChannelHeader) error {
if cHdr == nil {
return errors.New("nil ChannelHeader provided")
}
switch common.HeaderType(cHdr.Type) {
case common.HeaderType_ENDORSER_TRANSACTION:
case common.HeaderType_CONFIG_UPDATE:
case common.HeaderType_CONFIG:
default:
return errors.Errorf("invalid header type %s", common.HeaderType(cHdr.Type))
}
putilsLogger.Debugf("validateChannelHeader info: header type %d", common.HeaderType(cHdr.Type))
if cHdr.Epoch != 0 {
return errors.Errorf("invalid Epoch in ChannelHeader. Expected 0, got [%d]", cHdr.Epoch)
}
return nil
}
func validateCommonHeader(hdr *common.Header) (*common.ChannelHeader, *common.SignatureHeader, error) {
if hdr == nil {
return nil, nil, errors.New("nil header")
}
chdr, err := protoutil.UnmarshalChannelHeader(hdr.ChannelHeader)
if err != nil {
return nil, nil, err
}
shdr, err := protoutil.UnmarshalSignatureHeader(hdr.SignatureHeader)
if err != nil {
return nil, nil, err
}
err = validateChannelHeader(chdr)
if err != nil {
return nil, nil, err
}
err = validateSignatureHeader(shdr)
if err != nil {
return nil, nil, err
}
return chdr, shdr, nil
}
func validateConfigTransaction(data []byte, hdr *common.Header) error {
putilsLogger.Debugf("validateConfigTransaction starts for data %p, header %s", data, hdr)
if data == nil || hdr == nil {
return errors.New("nil arguments")
}
return nil
}
func validateEndorserTransaction(data []byte, hdr *common.Header) error {
putilsLogger.Debugf("validateEndorserTransaction starts for data %p, header %s", data, hdr)
if data == nil || hdr == nil {
return errors.New("nil arguments")
}
tx, err := protoutil.UnmarshalTransaction(data)
if err != nil {
return err
}
if tx == nil {
return errors.New("nil transaction")
}
if len(tx.Actions) != 1 {
return errors.Errorf("only one action per transaction is supported, tx contains %d", len(tx.Actions))
}
putilsLogger.Debugf("validateEndorserTransaction info: there are %d actions", len(tx.Actions))
for _, act := range tx.Actions {
if act == nil {
return errors.New("nil action")
}
sHdr, err := protoutil.UnmarshalSignatureHeader(act.Header)
if err != nil {
return err
}
err = validateSignatureHeader(sHdr)
if err != nil {
return err
}
putilsLogger.Debugf("validateEndorserTransaction info: signature header is valid")
ccActionPayload, err := protoutil.UnmarshalChaincodeActionPayload(act.Payload)
if err != nil {
return err
}
prp, err := protoutil.UnmarshalProposalResponsePayload(ccActionPayload.Action.ProposalResponsePayload)
if err != nil {
return err
}
hdrOrig := &common.Header{ChannelHeader: hdr.ChannelHeader, SignatureHeader: act.Header}
pHash, err := protoutil.GetProposalHash2(hdrOrig, ccActionPayload.ChaincodeProposalPayload)
if err != nil {
return err
}
if !bytes.Equal(pHash, prp.ProposalHash) {
return errors.New("proposal hash does not match")
}
}
return nil
}
func ValidateTransaction(e *common.Envelope) (*common.Payload, pb.TxValidationCode) {
putilsLogger.Debugf("ValidateTransactionEnvelope starts for envelope %p", e)
if e == nil {
putilsLogger.Errorf("Error: nil envelope")
return nil, pb.TxValidationCode_NIL_ENVELOPE
}
payload, err := protoutil.UnmarshalPayload(e.Payload)
if err != nil {
putilsLogger.Errorf("GetPayload returns err %s", err)
return nil, pb.TxValidationCode_BAD_PAYLOAD
}
putilsLogger.Debugf("Header is %s", payload.Header)
chdr, shdr, err := validateCommonHeader(payload.Header)
if err != nil {
putilsLogger.Errorf("validateCommonHeader returns err %s", err)
return nil, pb.TxValidationCode_BAD_COMMON_HEADER
}
err = checkSignatureFromCreator(shdr.Creator, e.Signature, e.Payload, chdr.ChannelId)
if err != nil {
putilsLogger.Errorf("checkSignatureFromCreator returns err %s", err)
return nil, pb.TxValidationCode_BAD_CREATOR_SIGNATURE
}
switch common.HeaderType(chdr.Type) {
case common.HeaderType_ENDORSER_TRANSACTION:
err = protoutil.CheckTxID(
chdr.TxId,
shdr.Nonce,
shdr.Creator)
if err != nil {
putilsLogger.Errorf("CheckTxID returns err %s", err)
return nil, pb.TxValidationCode_BAD_PROPOSAL_TXID
}
err = validateEndorserTransaction(payload.Data, payload.Header)
putilsLogger.Debugf("ValidateTransactionEnvelope returns err %s", err)
if err != nil {
putilsLogger.Errorf("validateEndorserTransaction returns err %s", err)
return payload, pb.TxValidationCode_INVALID_ENDORSER_TRANSACTION
} else {
return payload, pb.TxValidationCode_VALID
}
case common.HeaderType_CONFIG:
err = validateConfigTransaction(payload.Data, payload.Header)
if err != nil {
putilsLogger.Errorf("validateConfigTransaction returns err %s", err)
return payload, pb.TxValidationCode_INVALID_CONFIG_TRANSACTION
} else {
return payload, pb.TxValidationCode_VALID
}
default:
return nil, pb.TxValidationCode_UNSUPPORTED_TX_PAYLOAD
}
}