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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| // Program tskagent implements an SSH key agent that runs on a tailnet. | ||
| // This documentation needs more detail. | ||
| package main | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "fmt" | ||
| "log" | ||
| "net" | ||
| "os" | ||
| "os/signal" | ||
| "syscall" | ||
|
|
||
| "github.com/creachadair/command" | ||
| "github.com/creachadair/flax" | ||
| "github.com/creachadair/taskgroup" | ||
| "github.com/tailscale/setec/client/setec" | ||
| "github.com/tailscale/tskagent" | ||
| "golang.org/x/crypto/ssh/agent" | ||
| ) | ||
|
|
||
| var flags struct { | ||
| Server string `flag:"server,Secret server address (required)"` | ||
| Socket string `flag:"socket,Agent socket path (required)"` | ||
| Prefix string `flag:"prefix,Secret name prefix (required)"` | ||
| } | ||
|
|
||
| func main() { | ||
| root := &command.C{ | ||
| Name: command.ProgramName(), | ||
| Help: "Serve an SSH key agent on the specified socket.", | ||
| SetFlags: command.Flags(flax.MustBind, &flags), | ||
| Run: command.Adapt(run), | ||
| Commands: []*command.C{ | ||
| command.HelpCommand(nil), | ||
| command.VersionCommand(), | ||
| }, | ||
| } | ||
| ctx, cancel := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM) | ||
| defer cancel() | ||
| command.RunOrFail(root.NewEnv(nil).SetContext(ctx), os.Args[1:]) | ||
| } | ||
|
|
||
| func run(env *command.Env) error { | ||
| switch { | ||
| case flags.Server == "": | ||
| return env.Usagef("a secret --server address is required") | ||
| case flags.Socket == "": | ||
| return env.Usagef("an agent --socket path is required") | ||
| case flags.Prefix == "": | ||
| return env.Usagef("a secret name --prefix is required") | ||
| } | ||
| cli := setec.Client{Server: flags.Server} | ||
| lst, err := net.Listen("unix", flags.Socket) | ||
| if err != nil { | ||
| return fmt.Errorf("listen: %w", err) | ||
| } | ||
| defer os.Remove(flags.Socket) // best-effort | ||
|
|
||
| srv := tskagent.NewServer(tskagent.Config{ | ||
| Client: cli, | ||
| Prefix: flags.Prefix, | ||
| Logf: log.Printf, | ||
| }) | ||
| if err := srv.Update(env.Context()); err != nil { | ||
| return fmt.Errorf("initialize agent: %w", err) | ||
| } | ||
|
|
||
| var g taskgroup.Group | ||
| g.Run(func() { | ||
| <-env.Context().Done() | ||
| log.Printf("Signal received; closing listener") | ||
| lst.Close() | ||
| }) | ||
| for { | ||
| conn, err := lst.Accept() | ||
| if err != nil { | ||
| if !errors.Is(err, net.ErrClosed) { | ||
| log.Printf("Listener stopped: %v", err) | ||
| } | ||
| break | ||
| } | ||
| g.Go(func() error { | ||
| return agent.ServeAgent(srv, conn) | ||
| }) | ||
| } | ||
| g.Wait() | ||
| return nil | ||
| } |
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