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handler.go
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/
handler.go
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// Copyright Project Harbor 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 contenttrust
import (
"github.com/goharbor/harbor/src/common/utils"
"github.com/goharbor/harbor/src/common/utils/log"
"github.com/goharbor/harbor/src/common/utils/notary"
"github.com/goharbor/harbor/src/core/config"
"github.com/goharbor/harbor/src/core/middlewares/util"
"net/http"
)
// NotaryEndpoint ...
var NotaryEndpoint = ""
type contentTrustHandler struct {
next http.Handler
}
// New ...
func New(next http.Handler) http.Handler {
return &contentTrustHandler{
next: next,
}
}
// ServeHTTP ...
func (cth contentTrustHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
imgRaw := req.Context().Value(util.ImageInfoCtxKey)
if imgRaw == nil || !config.WithNotary() {
cth.next.ServeHTTP(rw, req)
return
}
img, _ := req.Context().Value(util.ImageInfoCtxKey).(util.ImageInfo)
if img.Digest == "" {
cth.next.ServeHTTP(rw, req)
return
}
if pullWithBearer, ok := util.DockerPullAuthFromContext(req.Context()); ok && !pullWithBearer {
cth.next.ServeHTTP(rw, req)
return
}
if scannerPull, ok := util.ScannerPullFromContext(req.Context()); ok && scannerPull {
cth.next.ServeHTTP(rw, req)
return
}
if !util.GetPolicyChecker().ContentTrustEnabled(img.ProjectName) {
cth.next.ServeHTTP(rw, req)
return
}
match, err := matchNotaryDigest(img)
if err != nil {
http.Error(rw, util.MarshalError("PROJECT_POLICY_VIOLATION", "Failed in communication with Notary please check the log"), http.StatusInternalServerError)
return
}
if !match {
log.Debugf("digest mismatch, failing the response.")
http.Error(rw, util.MarshalError("PROJECT_POLICY_VIOLATION", "The image is not signed in Notary."), http.StatusPreconditionFailed)
return
}
cth.next.ServeHTTP(rw, req)
}
func matchNotaryDigest(img util.ImageInfo) (bool, error) {
if NotaryEndpoint == "" {
NotaryEndpoint = config.InternalNotaryEndpoint()
}
targets, err := notary.GetInternalTargets(NotaryEndpoint, util.TokenUsername, img.Repository)
if err != nil {
return false, err
}
for _, t := range targets {
if utils.IsDigest(img.Reference) {
d, err := notary.DigestFromTarget(t)
if err != nil {
return false, err
}
if img.Digest == d {
return true, nil
}
} else {
if t.Tag == img.Reference {
log.Debugf("found reference: %s in notary, try to match digest.", img.Reference)
d, err := notary.DigestFromTarget(t)
if err != nil {
return false, err
}
if img.Digest == d {
return true, nil
}
}
}
}
log.Debugf("image: %#v, not found in notary", img)
return false, nil
}