forked from sigstore/cosign
-
-
Notifications
You must be signed in to change notification settings - Fork 0
/
attest.go
201 lines (176 loc) · 5.75 KB
/
attest.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
188
189
190
191
192
193
194
195
196
197
198
199
200
201
//
// Copyright 2021 The Sigstore Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package attest
import (
"bytes"
"context"
_ "crypto/sha256" // for `crypto.SHA256`
"encoding/json"
"fmt"
"os"
"time"
"github.com/google/go-containerregistry/pkg/name"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/sigstore/cosign/cmd/cosign/cli/options"
"github.com/sigstore/cosign/cmd/cosign/cli/rekor"
"github.com/sigstore/cosign/cmd/cosign/cli/sign"
"github.com/sigstore/cosign/pkg/cosign"
"github.com/sigstore/cosign/pkg/cosign/attestation"
cbundle "github.com/sigstore/cosign/pkg/cosign/bundle"
cremote "github.com/sigstore/cosign/pkg/cosign/remote"
"github.com/sigstore/cosign/pkg/oci/mutate"
ociremote "github.com/sigstore/cosign/pkg/oci/remote"
"github.com/sigstore/cosign/pkg/oci/static"
sigs "github.com/sigstore/cosign/pkg/signature"
"github.com/sigstore/cosign/pkg/types"
"github.com/sigstore/rekor/pkg/generated/client"
"github.com/sigstore/rekor/pkg/generated/models"
"github.com/sigstore/sigstore/pkg/signature/dsse"
signatureoptions "github.com/sigstore/sigstore/pkg/signature/options"
)
type tlogUploadFn func(*client.Rekor, []byte) (*models.LogEntryAnon, error)
func uploadToTlog(ctx context.Context, sv *sign.SignerVerifier, rekorURL string, upload tlogUploadFn) (*cbundle.RekorBundle, error) {
var rekorBytes []byte
// Upload the cert or the public key, depending on what we have
if sv.Cert != nil {
rekorBytes = sv.Cert
} else {
pemBytes, err := sigs.PublicKeyPem(sv, signatureoptions.WithContext(ctx))
if err != nil {
return nil, err
}
rekorBytes = pemBytes
}
rekorClient, err := rekor.NewClient(rekorURL)
if err != nil {
return nil, err
}
entry, err := upload(rekorClient, rekorBytes)
if err != nil {
return nil, err
}
fmt.Fprintln(os.Stderr, "tlog entry created with index:", *entry.LogIndex)
return cbundle.EntryToBundle(entry), nil
}
//nolint
func AttestCmd(ctx context.Context, ko options.KeyOpts, regOpts options.RegistryOptions, imageRef string, certPath string, certChainPath string,
noUpload bool, predicatePath string, force bool, predicateType string, replace bool, timeout time.Duration) error {
// A key file or token is required unless we're in experimental mode!
if options.EnableExperimental() {
if options.NOf(ko.KeyRef, ko.Sk) > 1 {
return &options.KeyParseError{}
}
} else {
if !options.OneOf(ko.KeyRef, ko.Sk) {
return &options.KeyParseError{}
}
}
predicateURI, err := options.ParsePredicateType(predicateType)
if err != nil {
return err
}
ref, err := name.ParseReference(imageRef)
if err != nil {
return fmt.Errorf("parsing reference: %w", err)
}
if timeout != 0 {
var cancelFn context.CancelFunc
ctx, cancelFn = context.WithTimeout(ctx, timeout)
defer cancelFn()
}
ociremoteOpts, err := regOpts.ClientOpts(ctx)
if err != nil {
return err
}
digest, err := ociremote.ResolveDigest(ref, ociremoteOpts...)
if err != nil {
return err
}
h, _ := v1.NewHash(digest.Identifier())
// Overwrite "ref" with a digest to avoid a race where we use a tag
// multiple times, and it potentially points to different things at
// each access.
ref = digest // nolint
sv, err := sign.SignerFromKeyOpts(ctx, certPath, certChainPath, ko)
if err != nil {
return fmt.Errorf("getting signer: %w", err)
}
defer sv.Close()
wrapped := dsse.WrapSigner(sv, types.IntotoPayloadType)
dd := cremote.NewDupeDetector(sv)
fmt.Fprintln(os.Stderr, "Using payload from:", predicatePath)
predicate, err := os.Open(predicatePath)
if err != nil {
return err
}
defer predicate.Close()
sh, err := attestation.GenerateStatement(attestation.GenerateOpts{
Predicate: predicate,
Type: predicateType,
Digest: h.Hex,
Repo: digest.Repository.String(),
})
if err != nil {
return err
}
payload, err := json.Marshal(sh)
if err != nil {
return err
}
signedPayload, err := wrapped.SignMessage(bytes.NewReader(payload), signatureoptions.WithContext(ctx))
if err != nil {
return fmt.Errorf("signing: %w", err)
}
if noUpload {
fmt.Println(string(signedPayload))
return nil
}
opts := []static.Option{static.WithLayerMediaType(types.DssePayloadType)}
if sv.Cert != nil {
opts = append(opts, static.WithCertChain(sv.Cert, sv.Chain))
}
// Check whether we should be uploading to the transparency log
if sign.ShouldUploadToTlog(ctx, digest, force, ko.RekorURL) {
bundle, err := uploadToTlog(ctx, sv, ko.RekorURL, func(r *client.Rekor, b []byte) (*models.LogEntryAnon, error) {
return cosign.TLogUploadInTotoAttestation(ctx, r, signedPayload, b)
})
if err != nil {
return err
}
opts = append(opts, static.WithBundle(bundle))
}
sig, err := static.NewAttestation(signedPayload, opts...)
if err != nil {
return err
}
se, err := ociremote.SignedEntity(digest, ociremoteOpts...)
if err != nil {
return err
}
signOpts := []mutate.SignOption{
mutate.WithDupeDetector(dd),
}
if replace {
ro := cremote.NewReplaceOp(predicateURI)
signOpts = append(signOpts, mutate.WithReplaceOp(ro))
}
// Attach the attestation to the entity.
newSE, err := mutate.AttachAttestationToEntity(se, sig, signOpts...)
if err != nil {
return err
}
// Publish the attestations associated with this entity
return ociremote.WriteAttestations(digest.Repository, newSE, ociremoteOpts...)
}