-
Notifications
You must be signed in to change notification settings - Fork 0
/
wrapper.go
187 lines (167 loc) · 5.52 KB
/
wrapper.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
package proxy
import (
cmn "github.com/tendermint/tendermint/libs/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.(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)
// }