forked from IBM/portieris
/
trust.go
153 lines (131 loc) · 4.92 KB
/
trust.go
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// Copyright 2018 Portieris 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 trust
import (
"bytes"
"context"
"encoding/hex"
"fmt"
"github.com/SimonBaeumer/portieris/helpers/credential"
notaryclient "github.com/theupdateframework/notary/client"
"path"
"strings"
"github.com/golang/glog"
"github.com/theupdateframework/notary/tuf/data"
"github.com/theupdateframework/notary/tuf/utils"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
var releasesRole = data.RoleName(path.Join(data.CanonicalTargetsRole.String(), "releases"))
// Signer struct holds the signer and publicKey from a SignerSecret
type Signer struct {
signer string
publicKey string
}
type foundSigner struct {
found bool
signer Signer
}
// getDigest .
func (v *Verifier) getDigest(server, image, notaryToken, targetName string, signers []Signer, credential credential.Credential) (*bytes.Buffer, error) {
var repo notaryclient.Repository
var err error
glog.Infof("Server: %s, Image: %s, TargetName: %s, token: %s", server, image, targetName, notaryToken)
if strings.Contains(server, "docker") {
repo, err = v.trust.GetDockerNotaryRepo(server, image, credential)
} else {
repo, err = v.trust.GetNotaryRepo(server, image, notaryToken)
}
if err != nil {
return nil, err
}
roleNames := make([]string, len(signers))
for i, val := range signers {
roleNames[i] = path.Join(data.CanonicalTargetsRole.String(), val.signer)
}
rolelist := data.NewRoleList(roleNames)
var foundSignerByRole = map[data.RoleName]*foundSigner{}
for i, role := range rolelist {
foundSignerByRole[role] = &foundSigner{
signer: signers[i],
}
}
targets, err := repo.GetAllTargetMetadataByName(targetName)
if err != nil {
glog.Infof("GetAllTargetMetadataByName returned err: %+v", err)
return nil, err
}
if len(targets) == 0 {
return nil, fmt.Errorf("No signed targets found")
}
var digest []byte // holds digest of the signed image
// Get the digest of the latest signed release
// A digest is "released" if it's signed by the targets or targets/releases roles
for _, target := range targets {
if target.Role.Name == data.CanonicalTargetsRole || target.Role.Name == releasesRole {
digest = target.Target.Hashes["sha256"]
}
}
if len(rolelist) == 0 {
glog.Infof("roleList length == 0, returning digest %s", hex.EncodeToString(digest))
} else {
for _, target := range targets { // iterate over each target
// See if a signer was specified for this target
if role, ok := foundSignerByRole[target.Role.Name]; ok {
if role.signer.publicKey != "" {
// Assuming public key is in PEM format and not encoded any further
keyFromConfig, err := utils.ParsePEMPublicKey([]byte(role.signer.publicKey))
if err != nil {
return nil, err
}
if _, ok := target.Role.BaseRole.Keys[keyFromConfig.ID()]; !ok {
glog.Infof("Key %s not found in role key list: %+v", keyFromConfig.ID(), target.Role.BaseRole.ListKeyIDs())
return nil, fmt.Errorf("Public keys are different")
}
// We found a matching KeyID, so mark the role found in the map.
role.found = true
} else {
glog.Infof("PublicKey not found in role %s", role.signer.signer)
return nil, fmt.Errorf("PublicKey not found in role %s", role.signer.signer)
}
// verify that the digest is consistent between all of the roles that we care about
if !bytes.Equal(digest, target.Target.Hashes["sha256"]) {
return nil, fmt.Errorf("Incompatible digest")
}
}
}
// Now iterate over the signers to make sure we hit them all going over targets
for _, role := range foundSignerByRole {
if !role.found {
return nil, fmt.Errorf("no signature found for role %s", role.signer.signer)
}
}
}
return bytes.NewBufferString(hex.EncodeToString(digest)), nil
}
// Retrieve the username and public key for the given namespace/secret
func (v *Verifier) getSignerSecret(namespace, signerSecretName string) (Signer, error) {
// Retrieve secret
secret, err := v.kubeClientsetWrapper.CoreV1().Secrets(namespace).Get(context.TODO(), signerSecretName, metav1.GetOptions{})
if err != nil {
glog.Error("Error: ", err)
return Signer{}, err
}
// Parse the returned data.
signer := string(secret.Data["name"])
publicKey := string(secret.Data["publicKey"])
if signer == "" || publicKey == "" {
return Signer{}, fmt.Errorf("name or publicKey field in secret %s is empty", signerSecretName)
}
return Signer{signer: signer, publicKey: publicKey}, nil
}