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Signed-off-by: Dan Lorenc <dlorenc@google.com>
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Dan Lorenc
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Jul 22, 2021
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,245 @@ | ||
| // | ||
| // 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 cli | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| _ "crypto/sha256" // for `crypto.SHA256` | ||
| "encoding/base64" | ||
| "encoding/json" | ||
| "flag" | ||
| "fmt" | ||
| "io/ioutil" | ||
| "os" | ||
| "path/filepath" | ||
|
|
||
| "github.com/google/go-containerregistry/pkg/name" | ||
| ggcrV1 "github.com/google/go-containerregistry/pkg/v1" | ||
| "github.com/google/go-containerregistry/pkg/v1/remote" | ||
| "github.com/in-toto/in-toto-golang/in_toto" | ||
| "github.com/peterbourgon/ff/v3/ffcli" | ||
| "github.com/pkg/errors" | ||
|
|
||
| "github.com/sigstore/cosign/pkg/cosign" | ||
| cremote "github.com/sigstore/cosign/pkg/cosign/remote" | ||
|
|
||
| rekorClient "github.com/sigstore/rekor/pkg/client" | ||
| "github.com/sigstore/sigstore/pkg/signature/dsse" | ||
| "github.com/sigstore/sigstore/pkg/signature/options" | ||
| ) | ||
|
|
||
| func Attest() *ffcli.Command { | ||
| var ( | ||
| flagset = flag.NewFlagSet("cosign attest", flag.ExitOnError) | ||
| key = flagset.String("key", "", "path to the private key file, KMS URI or Kubernetes Secret") | ||
| cert = flagset.String("cert", "", "Path to the x509 certificate to include in the Signature") | ||
| upload = flagset.Bool("upload", true, "whether to upload the signature") | ||
| sk = flagset.Bool("sk", false, "whether to use a hardware security key") | ||
| slot = flagset.String("slot", "", "security key slot to use for generated key (default: signature) (authentication|signature|card-authentication|key-management)") | ||
| predicatePath = flagset.String("predicate", "", "path to the predicate file.") | ||
| force = flagset.Bool("f", false, "skip warnings and confirmations") | ||
| idToken = flagset.String("identity-token", "", "[EXPERIMENTAL] identity token to use for certificate from fulcio") | ||
| ) | ||
| return &ffcli.Command{ | ||
| Name: "attest", | ||
| ShortUsage: "cosign attest -key <key path>|<kms uri> [-predicate <path>] [-a key=value] [-upload=true|false] [-f] [-r] <image uri>", | ||
| ShortHelp: `Attest the supplied container image.`, | ||
| LongHelp: `Attest the supplied container image. | ||
| EXAMPLES | ||
| # attach an attestation to a container image Google sign-in (experimental) | ||
| COSIGN_EXPERIMENTAL=1 cosign attest -attestation <FILE> <IMAGE> | ||
| # attach an attestation to a container image with a local key pair file | ||
| cosign attest -attestation <FILE> -key cosign.key <IMAGE> | ||
| # attach an attestation to a container image with a key pair stored in Azure Key Vault | ||
| cosign attest -attestation <FILE> -key azurekms://[VAULT_NAME][VAULT_URI]/[KEY] <IMAGE> | ||
| # attach an attestation to a container image with a key pair stored in AWS KMS | ||
| cosign attest -attestation <FILE> -key awskms://[ENDPOINT]/[ID/ALIAS/ARN] <IMAGE> | ||
| # attach an attestation to a container image with a key pair stored in Google Cloud KMS | ||
| cosign attest -attestation <FILE> -key gcpkms://projects/[PROJECT]/locations/global/keyRings/[KEYRING]/cryptoKeys/[KEY]/versions/[VERSION] <IMAGE> | ||
| # attach an attestation to a container image with a key pair stored in Hashicorp Vault | ||
| cosign attest -attestation <FILE> -key hashivault://[KEY] <IMAGE> | ||
| # attach an attestation to a container image which does not fully support OCI media types | ||
| COSIGN_DOCKER_MEDIA_TYPES=1 cosign attest -attestation <FILE> -key cosign.key legacy-registry.example.com/my/image | ||
| `, | ||
| FlagSet: flagset, | ||
| Exec: func(ctx context.Context, args []string) error { | ||
| if len(args) == 0 { | ||
| return flag.ErrHelp | ||
| } | ||
|
|
||
| ko := KeyOpts{ | ||
| KeyRef: *key, | ||
| PassFunc: GetPass, | ||
| Sk: *sk, | ||
| Slot: *slot, | ||
| IDToken: *idToken, | ||
| } | ||
| for _, img := range args { | ||
| if err := AttestCmd(ctx, ko, img, *cert, *upload, *predicatePath, *force); err != nil { | ||
| return errors.Wrapf(err, "signing %s", img) | ||
| } | ||
| } | ||
| return nil | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| const intotoPayloadType = "application/vnd.in-toto+json" | ||
|
|
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| func AttestCmd(ctx context.Context, ko KeyOpts, imageRef string, certPath string, | ||
| upload bool, predicatePath string, force bool) error { | ||
|
|
||
| // A key file or token is required unless we're in experimental mode! | ||
| if EnableExperimental() { | ||
| if nOf(ko.KeyRef, ko.Sk) > 1 { | ||
| return &KeyParseError{} | ||
| } | ||
| } else { | ||
| if !oneOf(ko.KeyRef, ko.Sk) { | ||
| return &KeyParseError{} | ||
| } | ||
| } | ||
|
|
||
| remoteOpts := DefaultRegistryClientOpts(ctx) | ||
|
|
||
| ref, err := name.ParseReference(imageRef) | ||
| if err != nil { | ||
| return errors.Wrap(err, "parsing reference") | ||
| } | ||
| get, err := remote.Get(ref, remoteOpts...) | ||
| if err != nil { | ||
| return errors.Wrap(err, "getting remote image") | ||
| } | ||
|
|
||
| repo := ref.Context() | ||
| img := repo.Digest(get.Digest.String()) | ||
|
|
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| sv, err := signerFromKeyOpts(ctx, certPath, ko) | ||
| if err != nil { | ||
| return errors.Wrap(err, "getting signer") | ||
| } | ||
| wrapped := dsse.WrapSigner(sv, intotoPayloadType) | ||
|
|
||
| fmt.Fprintln(os.Stderr, "Using payload from:", predicatePath) | ||
| rawPayload, err := ioutil.ReadFile(filepath.Clean(predicatePath)) | ||
| if err != nil { | ||
| return errors.Wrap(err, "payload from file") | ||
| } | ||
|
|
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| sh := in_toto.Statement{ | ||
| StatementHeader: in_toto.StatementHeader{ | ||
| Type: "https://in-toto.io/Statement/v0.1", | ||
| PredicateType: "cosign.sigstore.dev/attestation/v1", | ||
| Subject: []in_toto.Subject{ | ||
| { | ||
| Name: repo.String(), | ||
| Digest: map[string]string{ | ||
| "sha256": get.Digest.Hex, | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| Predicate: CosignAttestation{ | ||
| Data: string(rawPayload), | ||
| }, | ||
| } | ||
|
|
||
| payload, err := json.Marshal(sh) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| sig, err := wrapped.SignMessage(bytes.NewReader(payload), options.WithContext(ctx)) | ||
| if err != nil { | ||
| return errors.Wrap(err, "signing") | ||
| } | ||
|
|
||
| if !upload { | ||
| fmt.Println(base64.StdEncoding.EncodeToString(sig)) | ||
| return nil | ||
| } | ||
|
|
||
| sigRepo, err := TargetRepositoryForImage(ref) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| imgHash, err := ggcrV1.NewHash(img.Identifier()) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| attRef := cosign.AttachedImageTag(sigRepo, &remote.Descriptor{ | ||
| Descriptor: ggcrV1.Descriptor{ | ||
| Digest: imgHash, | ||
| }, | ||
| }, cosign.AttestationTagSuffix) | ||
|
|
||
| uo := cremote.UploadOpts{ | ||
| Cert: sv.Cert, | ||
| Chain: sv.Chain, | ||
| DupeDetector: sv, | ||
| RemoteOpts: remoteOpts, | ||
| } | ||
|
|
||
| uploadTLog, err := shouldUploadToTlog(ref, force, ko.RekorURL) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if uploadTLog { | ||
| var rekorBytes []byte | ||
|
|
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| // Upload the cert or the public key, depending on what we have | ||
| if sv.Cert != nil { | ||
| rekorBytes = sv.Cert | ||
| } else { | ||
| pemBytes, err := cosign.PublicKeyPem(sv, options.WithContext(ctx)) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| rekorBytes = pemBytes | ||
| } | ||
| rekorClient, err := rekorClient.GetRekorClient(ko.RekorURL) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| entry, err := cosign.UploadAttestationTLog(rekorClient, sig, rekorBytes) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| fmt.Println("tlog entry created with index: ", *entry.LogIndex) | ||
|
|
||
| uo.Bundle = bundle(entry) | ||
| uo.AdditionalAnnotations = parseAnnotations(entry) | ||
| } | ||
|
|
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| fmt.Fprintln(os.Stderr, "Pushing attestation to:", attRef.String()) | ||
| if _, err = cremote.UploadSignature(sig, payload, attRef, uo); err != nil { | ||
| return errors.Wrap(err, "uploading") | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| type CosignAttestation struct { | ||
| Data string | ||
| } |
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