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package ssh
import (
"context"
"errors"
"fmt"
"os"
"time"
gliderssh "github.com/gliderlabs/ssh"
"go.lindenii.runxiyu.org/forge/forged/internal/common/misc"
gossh "golang.org/x/crypto/ssh"
)
type Config struct {
Net string `scfg:"net"`
Addr string `scfg:"addr"`
Key string `scfg:"key"`
Root string `scfg:"root"`
ShutdownTimeout uint32 `scfg:"shutdown_timeout"`
}
type Server struct {
gliderServer *gliderssh.Server
privkey gossh.Signer
pubkeyString string
pubkeyFP string
net string
addr string
root string
shutdownTimeout uint32
}
func New(config Config) (server *Server, err error) {
server = &Server{
net: config.Net,
addr: config.Addr,
root: config.Root,
shutdownTimeout: config.ShutdownTimeout,
}
var privkeyBytes []byte
if privkeyBytes, err = os.ReadFile(config.Key); err != nil {
return server, fmt.Errorf("read SSH private key: %w", err)
}
if server.privkey, err = gossh.ParsePrivateKey(privkeyBytes); err != nil {
return server, fmt.Errorf("parse SSH private key: %w", err)
}
server.pubkeyString = misc.BytesToString(gossh.MarshalAuthorizedKey(server.privkey.PublicKey()))
server.pubkeyFP = gossh.FingerprintSHA256(server.privkey.PublicKey())
server.gliderServer = &gliderssh.Server{
Handler: handle,
PublicKeyHandler: func(ctx gliderssh.Context, key gliderssh.PublicKey) bool { return true },
KeyboardInteractiveHandler: func(ctx gliderssh.Context, challenge gossh.KeyboardInteractiveChallenge) bool { return true },
}
server.gliderServer.AddHostKey(server.privkey)
return
}
func (server *Server) Run(ctx context.Context) (err error) {
listener, err := misc.Listen(server.net, server.addr)
defer func() {
_ = listener.Close()
}()
go func() {
<-ctx.Done()
shCtx, cancel := context.WithTimeout(context.Background(), time.Duration(server.shutdownTimeout)*time.Second)
defer cancel()
_ = server.gliderServer.Shutdown(shCtx)
_ = listener.Close()
}()
if err = server.gliderServer.Serve(listener); err != nil {
if errors.Is(err, gliderssh.ErrServerClosed) {
return nil
}
return fmt.Errorf("serve SSH: %w", err)
}
panic("unreachable")
}
func handle(session gliderssh.Session) {
panic("SSH server handler not implemented yet")
}
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