mirror of https://github.com/docker/cli.git
115 lines
2.2 KiB
Go
115 lines
2.2 KiB
Go
package sshforward
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import (
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"io/ioutil"
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"net"
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"os"
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"path/filepath"
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"github.com/moby/buildkit/session"
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"github.com/pkg/errors"
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context "golang.org/x/net/context"
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"golang.org/x/sync/errgroup"
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"google.golang.org/grpc/metadata"
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)
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// DefaultID is the default ssh ID
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const DefaultID = "default"
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const KeySSHID = "buildkit.ssh.id"
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type server struct {
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caller session.Caller
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}
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func (s *server) run(ctx context.Context, l net.Listener, id string) error {
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eg, ctx := errgroup.WithContext(ctx)
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eg.Go(func() error {
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<-ctx.Done()
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return ctx.Err()
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})
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eg.Go(func() error {
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for {
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conn, err := l.Accept()
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if err != nil {
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return err
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}
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client := NewSSHClient(s.caller.Conn())
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opts := make(map[string][]string)
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opts[KeySSHID] = []string{id}
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ctx = metadata.NewOutgoingContext(ctx, opts)
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stream, err := client.ForwardAgent(ctx)
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if err != nil {
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conn.Close()
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return err
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}
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go Copy(ctx, conn, stream, stream.CloseSend)
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}
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})
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return eg.Wait()
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}
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type SocketOpt struct {
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ID string
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UID int
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GID int
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Mode int
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}
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func MountSSHSocket(ctx context.Context, c session.Caller, opt SocketOpt) (sockPath string, closer func() error, err error) {
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dir, err := ioutil.TempDir("", ".buildkit-ssh-sock")
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if err != nil {
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return "", nil, errors.WithStack(err)
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}
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defer func() {
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if err != nil {
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os.RemoveAll(dir)
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}
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}()
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sockPath = filepath.Join(dir, "ssh_auth_sock")
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l, err := net.Listen("unix", sockPath)
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if err != nil {
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return "", nil, errors.WithStack(err)
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}
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if err := os.Chown(sockPath, opt.UID, opt.GID); err != nil {
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l.Close()
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return "", nil, errors.WithStack(err)
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}
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if err := os.Chmod(sockPath, os.FileMode(opt.Mode)); err != nil {
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l.Close()
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return "", nil, errors.WithStack(err)
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}
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s := &server{caller: c}
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id := opt.ID
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if id == "" {
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id = DefaultID
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}
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go s.run(ctx, l, id) // erroring per connection allowed
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return sockPath, func() error {
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err := l.Close()
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os.RemoveAll(sockPath)
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return errors.WithStack(err)
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}, nil
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}
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func CheckSSHID(ctx context.Context, c session.Caller, id string) error {
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client := NewSSHClient(c.Conn())
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_, err := client.CheckAgent(ctx, &CheckAgentRequest{ID: id})
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return errors.WithStack(err)
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}
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