You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
187 lines
5.5 KiB
187 lines
5.5 KiB
package proxy
|
|
|
|
import (
|
|
cmn "github.com/tendermint/tmlibs/common"
|
|
|
|
"github.com/tendermint/tendermint/lite"
|
|
certclient "github.com/tendermint/tendermint/lite/client"
|
|
rpcclient "github.com/tendermint/tendermint/rpc/client"
|
|
ctypes "github.com/tendermint/tendermint/rpc/core/types"
|
|
)
|
|
|
|
var _ rpcclient.Client = Wrapper{}
|
|
|
|
// Wrapper wraps a rpcclient with a Certifier and double-checks any input that is
|
|
// provable before passing it along. Allows you to make any rpcclient fully secure.
|
|
type Wrapper struct {
|
|
rpcclient.Client
|
|
cert *lite.InquiringCertifier
|
|
}
|
|
|
|
// SecureClient uses a given certifier to wrap an connection to an untrusted
|
|
// host and return a cryptographically secure rpc client.
|
|
//
|
|
// If it is wrapping an HTTP rpcclient, it will also wrap the websocket interface
|
|
func SecureClient(c rpcclient.Client, cert *lite.InquiringCertifier) Wrapper {
|
|
wrap := Wrapper{c, cert}
|
|
// TODO: no longer possible as no more such interface exposed....
|
|
// if we wrap http client, then we can swap out the event switch to filter
|
|
// if hc, ok := c.(*rpcclient.HTTP); ok {
|
|
// evt := hc.WSEvents.EventSwitch
|
|
// hc.WSEvents.EventSwitch = WrappedSwitch{evt, wrap}
|
|
// }
|
|
return wrap
|
|
}
|
|
|
|
// ABCIQueryWithOptions exposes all options for the ABCI query and verifies the returned proof
|
|
func (w Wrapper) ABCIQueryWithOptions(path string, data cmn.HexBytes,
|
|
opts rpcclient.ABCIQueryOptions) (*ctypes.ResultABCIQuery, error) {
|
|
|
|
res, _, err := GetWithProofOptions(path, data, opts, w.Client, w.cert)
|
|
return res, err
|
|
}
|
|
|
|
// ABCIQuery uses default options for the ABCI query and verifies the returned proof
|
|
func (w Wrapper) ABCIQuery(path string, data cmn.HexBytes) (*ctypes.ResultABCIQuery, error) {
|
|
return w.ABCIQueryWithOptions(path, data, rpcclient.DefaultABCIQueryOptions)
|
|
}
|
|
|
|
// Tx queries for a given tx and verifies the proof if it was requested
|
|
func (w Wrapper) Tx(hash []byte, prove bool) (*ctypes.ResultTx, error) {
|
|
res, err := w.Client.Tx(hash, prove)
|
|
if !prove || err != nil {
|
|
return res, err
|
|
}
|
|
h := int64(res.Height)
|
|
check, err := GetCertifiedCommit(h, w.Client, w.cert)
|
|
if err != nil {
|
|
return res, err
|
|
}
|
|
err = res.Proof.Validate(check.Header.DataHash)
|
|
return res, err
|
|
}
|
|
|
|
// BlockchainInfo requests a list of headers and verifies them all...
|
|
// Rather expensive.
|
|
//
|
|
// TODO: optimize this if used for anything needing performance
|
|
func (w Wrapper) BlockchainInfo(minHeight, maxHeight int64) (*ctypes.ResultBlockchainInfo, error) {
|
|
r, err := w.Client.BlockchainInfo(minHeight, maxHeight)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// go and verify every blockmeta in the result....
|
|
for _, meta := range r.BlockMetas {
|
|
// get a checkpoint to verify from
|
|
c, err := w.Commit(&meta.Header.Height)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
check := certclient.CommitFromResult(c)
|
|
err = ValidateBlockMeta(meta, check)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
return r, nil
|
|
}
|
|
|
|
// Block returns an entire block and verifies all signatures
|
|
func (w Wrapper) Block(height *int64) (*ctypes.ResultBlock, error) {
|
|
r, err := w.Client.Block(height)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
// get a checkpoint to verify from
|
|
c, err := w.Commit(height)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
check := certclient.CommitFromResult(c)
|
|
|
|
// now verify
|
|
err = ValidateBlockMeta(r.BlockMeta, check)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
err = ValidateBlock(r.Block, check)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return r, nil
|
|
}
|
|
|
|
// Commit downloads the Commit and certifies it with the lite.
|
|
//
|
|
// This is the foundation for all other verification in this module
|
|
func (w Wrapper) Commit(height *int64) (*ctypes.ResultCommit, error) {
|
|
rpcclient.WaitForHeight(w.Client, *height, nil)
|
|
r, err := w.Client.Commit(height)
|
|
// if we got it, then certify it
|
|
if err == nil {
|
|
check := certclient.CommitFromResult(r)
|
|
err = w.cert.Certify(check)
|
|
}
|
|
return r, err
|
|
}
|
|
|
|
// // WrappedSwitch creates a websocket connection that auto-verifies any info
|
|
// // coming through before passing it along.
|
|
// //
|
|
// // Since the verification takes 1-2 rpc calls, this is obviously only for
|
|
// // relatively low-throughput situations that can tolerate a bit extra latency
|
|
// type WrappedSwitch struct {
|
|
// types.EventSwitch
|
|
// client rpcclient.Client
|
|
// }
|
|
|
|
// // FireEvent verifies any block or header returned from the eventswitch
|
|
// func (s WrappedSwitch) FireEvent(event string, data events.EventData) {
|
|
// tm, ok := data.(types.TMEventData)
|
|
// if !ok {
|
|
// fmt.Printf("bad type %#v\n", data)
|
|
// return
|
|
// }
|
|
|
|
// // check to validate it if possible, and drop if not valid
|
|
// switch t := tm.Unwrap().(type) {
|
|
// case types.EventDataNewBlockHeader:
|
|
// err := verifyHeader(s.client, t.Header)
|
|
// if err != nil {
|
|
// fmt.Printf("Invalid header: %#v\n", err)
|
|
// return
|
|
// }
|
|
// case types.EventDataNewBlock:
|
|
// err := verifyBlock(s.client, t.Block)
|
|
// if err != nil {
|
|
// fmt.Printf("Invalid block: %#v\n", err)
|
|
// return
|
|
// }
|
|
// // TODO: can we verify tx as well? anything else
|
|
// }
|
|
|
|
// // looks good, we fire it
|
|
// s.EventSwitch.FireEvent(event, data)
|
|
// }
|
|
|
|
// func verifyHeader(c rpcclient.Client, head *types.Header) error {
|
|
// // get a checkpoint to verify from
|
|
// commit, err := c.Commit(&head.Height)
|
|
// if err != nil {
|
|
// return err
|
|
// }
|
|
// check := certclient.CommitFromResult(commit)
|
|
// return ValidateHeader(head, check)
|
|
// }
|
|
//
|
|
// func verifyBlock(c rpcclient.Client, block *types.Block) error {
|
|
// // get a checkpoint to verify from
|
|
// commit, err := c.Commit(&block.Height)
|
|
// if err != nil {
|
|
// return err
|
|
// }
|
|
// check := certclient.CommitFromResult(commit)
|
|
// return ValidateBlock(block, check)
|
|
// }
|