aboutsummaryrefslogtreecommitdiff
path: root/pkg/db/trillian.go
blob: 97f130554dc95542709e299c308c37f40c89e09f (plain)
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
188
189
190
191
192
193
194
package db

import (
	"context"
	"fmt"
	"time"

	"git.sigsum.org/sigsum-go/pkg/requests"
	"git.sigsum.org/sigsum-go/pkg/types"
	"github.com/golang/glog"
	"github.com/google/trillian"
	trillianTypes "github.com/google/trillian/types"
	"google.golang.org/grpc/codes"
)

// TrillianClient implements the Client interface for Trillian's gRPC backend
type TrillianClient struct {
	// TreeID is a Merkle tree identifier that Trillian uses
	TreeID int64

	// GRPC is a Trillian gRPC client
	GRPC trillian.TrillianLogClient
}

func (c *TrillianClient) AddLeaf(ctx context.Context, req *requests.Leaf) error {
	leaf := types.Leaf{
		Statement: types.Statement{
			ShardHint: req.ShardHint,
			Checksum:  *types.HashFn(req.Message[:]),
		},
		Signature: req.Signature,
		KeyHash:   *types.HashFn(req.VerificationKey[:]),
	}
	serialized := leaf.ToBinary()

	glog.V(3).Infof("queueing leaf request: %x", types.LeafHash(serialized))
	rsp, err := c.GRPC.QueueLeaf(ctx, &trillian.QueueLeafRequest{
		LogId: c.TreeID,
		Leaf: &trillian.LogLeaf{
			LeafValue: serialized,
		},
	})
	if err != nil {
		return fmt.Errorf("backend failure: %v", err)
	}
	if rsp == nil {
		return fmt.Errorf("no response")
	}
	if rsp.QueuedLeaf == nil {
		return fmt.Errorf("no queued leaf")
	}
	if codes.Code(rsp.QueuedLeaf.GetStatus().GetCode()) == codes.AlreadyExists {
		return fmt.Errorf("leaf is already queued or included")
	}
	return nil
}

func (c *TrillianClient) GetTreeHead(ctx context.Context) (*types.TreeHead, error) {
	rsp, err := c.GRPC.GetLatestSignedLogRoot(ctx, &trillian.GetLatestSignedLogRootRequest{
		LogId: c.TreeID,
	})
	if err != nil {
		return nil, fmt.Errorf("backend failure: %v", err)
	}
	if rsp == nil {
		return nil, fmt.Errorf("no response")
	}
	if rsp.SignedLogRoot == nil {
		return nil, fmt.Errorf("no signed log root")
	}
	if rsp.SignedLogRoot.LogRoot == nil {
		return nil, fmt.Errorf("no log root")
	}
	var r trillianTypes.LogRootV1
	if err := r.UnmarshalBinary(rsp.SignedLogRoot.LogRoot); err != nil {
		return nil, fmt.Errorf("no log root: unmarshal failed: %v", err)
	}
	if len(r.RootHash) != types.HashSize {
		return nil, fmt.Errorf("unexpected hash length: %d", len(r.RootHash))
	}
	return treeHeadFromLogRoot(&r), nil
}

func (c *TrillianClient) GetConsistencyProof(ctx context.Context, req *requests.ConsistencyProof) (*types.ConsistencyProof, error) {
	rsp, err := c.GRPC.GetConsistencyProof(ctx, &trillian.GetConsistencyProofRequest{
		LogId:          c.TreeID,
		FirstTreeSize:  int64(req.OldSize),
		SecondTreeSize: int64(req.NewSize),
	})
	if err != nil {
		return nil, fmt.Errorf("backend failure: %v", err)
	}
	if rsp == nil {
		return nil, fmt.Errorf("no response")
	}
	if rsp.Proof == nil {
		return nil, fmt.Errorf("no consistency proof")
	}
	if len(rsp.Proof.Hashes) == 0 {
		return nil, fmt.Errorf("not a consistency proof: empty")
	}
	path, err := nodePathFromHashes(rsp.Proof.Hashes)
	if err != nil {
		return nil, fmt.Errorf("not a consistency proof: %v", err)
	}
	return &types.ConsistencyProof{
		OldSize: req.OldSize,
		NewSize: req.NewSize,
		Path:    path,
	}, nil
}

func (c *TrillianClient) GetInclusionProof(ctx context.Context, req *requests.InclusionProof) (*types.InclusionProof, error) {
	rsp, err := c.GRPC.GetInclusionProofByHash(ctx, &trillian.GetInclusionProofByHashRequest{
		LogId:           c.TreeID,
		LeafHash:        req.LeafHash[:],
		TreeSize:        int64(req.TreeSize),
		OrderBySequence: true,
	})
	if err != nil {
		return nil, fmt.Errorf("backend failure: %v", err)
	}
	if rsp == nil {
		return nil, fmt.Errorf("no response")
	}
	if len(rsp.Proof) != 1 {
		return nil, fmt.Errorf("bad proof count: %d", len(rsp.Proof))
	}
	proof := rsp.Proof[0]
	if len(proof.Hashes) == 0 {
		return nil, fmt.Errorf("not an inclusion proof: empty")
	}
	path, err := nodePathFromHashes(proof.Hashes)
	if err != nil {
		return nil, fmt.Errorf("not an inclusion proof: %v", err)
	}
	return &types.InclusionProof{
		TreeSize:  req.TreeSize,
		LeafIndex: uint64(proof.LeafIndex),
		Path:      path,
	}, nil
}

func (c *TrillianClient) GetLeaves(ctx context.Context, req *requests.Leaves) (*types.Leaves, error) {
	rsp, err := c.GRPC.GetLeavesByRange(ctx, &trillian.GetLeavesByRangeRequest{
		LogId:      c.TreeID,
		StartIndex: int64(req.StartSize),
		Count:      int64(req.EndSize-req.StartSize) + 1,
	})
	if err != nil {
		return nil, fmt.Errorf("backend failure: %v", err)
	}
	if rsp == nil {
		return nil, fmt.Errorf("no response")
	}
	if got, want := len(rsp.Leaves), int(req.EndSize-req.StartSize+1); got != want {
		return nil, fmt.Errorf("unexpected number of leaves: %d", got)
	}
	var list types.Leaves = make([]types.Leaf, 0, len(rsp.Leaves))
	for i, leaf := range rsp.Leaves {
		leafIndex := int64(req.StartSize + uint64(i))
		if leafIndex != leaf.LeafIndex {
			return nil, fmt.Errorf("unexpected leaf(%d): got index %d", leafIndex, leaf.LeafIndex)
		}

		var l types.Leaf
		if err := l.FromBinary(leaf.LeafValue); err != nil {
			return nil, fmt.Errorf("unexpected leaf(%d): %v", leafIndex, err)
		}
		list = append(list[:], l)
	}
	return &list, nil
}

func treeHeadFromLogRoot(lr *trillianTypes.LogRootV1) *types.TreeHead {
	th := types.TreeHead{
		Timestamp: uint64(time.Now().Unix()),
		TreeSize:  uint64(lr.TreeSize),
	}
	copy(th.RootHash[:], lr.RootHash)
	return &th
}

func nodePathFromHashes(hashes [][]byte) ([]types.Hash, error) {
	path := make([]types.Hash, len(hashes))
	for i := 0; i < len(hashes); i++ {
		if len(hashes[i]) != types.HashSize {
			return nil, fmt.Errorf("unexpected hash length: %v", len(hashes[i]))
		}

		copy(path[i][:], hashes[i])
	}
	return path, nil
}