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auth.go
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auth.go
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// MIT License
//
// Copyright (c) 2018 buildtool
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package docker
import (
"context"
"crypto/ed25519"
"crypto/hmac"
"crypto/sha256"
"fmt"
"net/http"
"time"
authutil "github.com/containerd/containerd/remotes/docker/auth"
"github.com/docker/docker/api/types"
"github.com/moby/buildkit/session"
"github.com/moby/buildkit/session/auth"
"golang.org/x/crypto/nacl/sign"
"google.golang.org/grpc"
)
type authenticator struct {
authConfig types.AuthConfig
registryHost string
}
func NewAuthenticator(registryHost string, authConfig types.AuthConfig) Authenticator {
return &authenticator{
authConfig: authConfig,
registryHost: registryHost,
}
}
func (a *authenticator) Register(server *grpc.Server) {
auth.RegisterAuthServer(server, a)
}
func (a authenticator) Credentials(ctx context.Context, req *auth.CredentialsRequest) (*auth.CredentialsResponse, error) {
if req.Host != a.registryHost {
return &auth.CredentialsResponse{}, nil
}
return &auth.CredentialsResponse{Username: a.authConfig.Username, Secret: a.authConfig.Password}, nil
}
func (a authenticator) FetchToken(ctx context.Context, req *auth.FetchTokenRequest) (*auth.FetchTokenResponse, error) {
to := authutil.TokenOptions{
Realm: req.Realm,
Service: req.Service,
Scopes: req.Scopes,
Username: "",
Secret: "",
}
// do request anonymously
resp, err := authutil.FetchToken(ctx, http.DefaultClient, nil, to)
if err != nil {
// try with auth
to.Username = a.authConfig.Username
to.Secret = a.authConfig.Password
resp, err = authutil.FetchToken(ctx, http.DefaultClient, nil, to)
if err != nil {
return nil, fmt.Errorf("failed to fetch anonymous and authenticated token, %w", err)
}
}
return toTokenResponse(resp.Token, resp.IssuedAt, resp.ExpiresIn), nil
}
func (ap *authenticator) GetTokenAuthority(ctx context.Context, req *auth.GetTokenAuthorityRequest) (*auth.GetTokenAuthorityResponse, error) {
key := ap.getAuthorityKey(req.Host, req.Salt)
return &auth.GetTokenAuthorityResponse{PublicKey: key[32:]}, nil
}
func (ap *authenticator) VerifyTokenAuthority(ctx context.Context, req *auth.VerifyTokenAuthorityRequest) (*auth.VerifyTokenAuthorityResponse, error) {
key := ap.getAuthorityKey(req.Host, req.Salt)
priv := new([64]byte)
copy((*priv)[:], key)
return &auth.VerifyTokenAuthorityResponse{Signed: sign.Sign(nil, req.Payload, priv)}, nil
}
var _ Authenticator = &authenticator{}
type Authenticator interface {
auth.AuthServer
session.Attachable
}
func toTokenResponse(token string, issuedAt time.Time, expires int) *auth.FetchTokenResponse {
resp := &auth.FetchTokenResponse{
Token: token,
ExpiresIn: int64(expires),
}
if !issuedAt.IsZero() {
resp.IssuedAt = issuedAt.Unix()
}
return resp
}
func (ap *authenticator) getAuthorityKey(host string, salt []byte) ed25519.PrivateKey {
mac := hmac.New(sha256.New, salt)
sum := mac.Sum(nil)
return ed25519.NewKeyFromSeed(sum[:ed25519.SeedSize])
}