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notary.go
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notary.go
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// Copyright 2018, 2022 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 notary
import (
"crypto/tls"
"crypto/x509"
"fmt"
"net"
"net/http"
"os"
"time"
httphelper "github.com/IBM/portieris/helpers/http"
"github.com/IBM/portieris/helpers/image"
"github.com/IBM/portieris/internal/info"
"github.com/docker/distribution/registry/client/transport"
notaryclient "github.com/theupdateframework/notary/client"
"github.com/theupdateframework/notary/trustpinning"
"github.com/theupdateframework/notary/tuf/data"
)
// AuthEndpoint .
type AuthEndpoint struct {
URL string
Service string
Scope string
}
// Client .
type Client struct {
trustDir string
rootCAs *x509.CertPool
}
// Interface .
type Interface interface {
GetNotaryRepo(server, image, notaryToken string) (notaryclient.Repository, error)
CheckAuthRequired(notaryURL string, img *image.Reference) (*AuthEndpoint, error)
}
// NewClient creates and initializes the client
func NewClient(trustDir string, customCA []byte) (Interface, error) {
// Create a trust directory
err := createTrustDir(trustDir)
if err != nil {
return nil, err
}
rootCA, err := x509.SystemCertPool()
if err != nil {
return nil, err
}
if customCA != nil {
rootCA.AppendCertsFromPEM(customCA)
}
return &Client{trustDir: trustDir, rootCAs: rootCA}, nil
}
// GetNotaryRepo .
func (c Client) GetNotaryRepo(server, image, notaryToken string) (notaryclient.Repository, error) {
return notaryclient.NewFileCachedRepository(
c.trustDir,
data.GUN(image),
server,
c.makeHubTransport(notaryToken),
nil,
trustpinning.TrustPinConfig{},
)
}
// CheckAuthRequired checks if the notary requires authentication and returns information where to authenticate
func (c Client) CheckAuthRequired(notaryURL string, img *image.Reference) (*AuthEndpoint, error) {
client := &http.Client{Transport: c.makeHubTransport("")}
req, err := http.NewRequest("GET", fmt.Sprintf("%s/v2/%s/_trust/tuf/root.json", notaryURL, img.NameWithoutTag()), nil)
if err != nil {
return nil, err
}
resp, err := client.Do(req)
if err != nil || resp.StatusCode != http.StatusUnauthorized {
// either an error occured or authentication isn't required
return nil, err
}
challenges, err := httphelper.ParseAuthHeader(resp.Header)
if err != nil {
return nil, err
}
for _, challenge := range challenges {
endpoint := AuthEndpoint{}
if v, ok := challenge.Parameters["realm"]; ok {
endpoint.URL = v
} else {
continue
}
if v, ok := challenge.Parameters["service"]; ok {
endpoint.Service = v
} else {
continue
}
if v, ok := challenge.Parameters["scope"]; ok {
endpoint.Scope = v
} else {
continue
}
return &endpoint, nil
}
return nil, fmt.Errorf("no supported auth-endpoint found")
}
func (c Client) makeHubTransport(notaryToken string) http.RoundTripper {
base := &http.Transport{
Proxy: http.ProxyFromEnvironment,
Dial: (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
DualStack: true,
}).Dial,
TLSHandshakeTimeout: 10 * time.Second,
TLSClientConfig: &tls.Config{
// Avoid fallback by default to SSL protocols < TLS1.2
MinVersion: tls.VersionTLS12,
PreferServerCipherSuites: true,
RootCAs: c.rootCAs,
},
DisableKeepAlives: true,
}
modifiers := []transport.RequestModifier{
transport.NewHeaderRequestModifier(http.Header{
"User-Agent": []string{"portieris/" + info.Version},
}),
}
if notaryToken != "" {
modifiers = []transport.RequestModifier{
transport.NewHeaderRequestModifier(http.Header{
"User-Agent": []string{"portieris/" + info.Version},
"Authorization": []string{fmt.Sprintf("Bearer %s", notaryToken)},
}),
}
}
return transport.NewTransport(base, modifiers...)
}
func createTrustDir(trustDir string) error {
// Create a new directory only if it doesn't exist
if !fileExists(trustDir) {
if err := os.MkdirAll(trustDir, 0700); err != nil {
return err
}
}
return nil
}
func fileExists(path string) bool {
_, err := os.Stat(path)
if err != nil {
if os.IsNotExist(err) {
return false
}
}
return true
}