Factor out ssh service code
This commit is contained in:
lash
parent
19372c17f4
commit
935b777e57
GPG Key ID:
21D2E7BB88C2A746
297
cmd/ssh/main.go
297
cmd/ssh/main.go
@ -2,25 +2,18 @@ package main
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import (
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"context"
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"encoding/hex"
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"errors"
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"flag"
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"fmt"
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"net"
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"path"
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"os"
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"sync"
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"golang.org/x/crypto/ssh"
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"git.defalsify.org/vise.git/db"
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"git.defalsify.org/vise.git/engine"
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"git.defalsify.org/vise.git/logging"
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"git.defalsify.org/vise.git/resource"
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"git.defalsify.org/vise.git/state"
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"git.grassecon.net/urdt/ussd/internal/handlers"
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"git.grassecon.net/urdt/ussd/internal/storage"
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"git.grassecon.net/urdt/ussd/internal/ssh"
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)
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var (
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@ -30,274 +23,6 @@ var (
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scriptDir = path.Join("services", "registration")
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)
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type auther struct {
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Ctx context.Context
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auth map[string]string
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}
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func NewAuther(ctx context.Context) *auther {
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return &auther{
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Ctx: ctx,
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auth: make(map[string]string),
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}
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}
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func(a *auther) Check(conn ssh.ConnMetadata, pubKey ssh.PublicKey) (*ssh.Permissions, error) {
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keyStore.SetLanguage(nil)
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keyStore.SetPrefix(storage.DATATYPE_CUSTOM)
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k := append([]byte{0x01}, pubKey.Marshal()...)
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v, err := keyStore.Get(a.Ctx, k)
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if err != nil {
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return nil, err
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}
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ka := hex.EncodeToString(conn.SessionID())
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va := string(v)
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a.auth[ka] = va
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fmt.Fprintf(os.Stderr, "connect: %s -> %s\n", ka, v)
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return nil, nil
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}
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func(a *auther) FromConn(c *ssh.ServerConn) (string, error) {
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if c == nil {
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return "", errors.New("nil server conn")
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}
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if c.Conn == nil {
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return "", errors.New("nil underlying conn")
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}
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return a.Get(c.Conn.SessionID())
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}
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func(a *auther) Get(k []byte) (string, error) {
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ka := hex.EncodeToString(k)
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v, ok := a.auth[ka]
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if !ok {
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return "", errors.New("not found")
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}
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return v, nil
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}
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//func serve(ctx context.Context, sessionId string, ch ssh.NewChannel, mss *storage.MenuStorageService, lhs *handlers.LocalHandlerService) error {
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func serve(ctx context.Context, sessionId string, ch ssh.NewChannel, en engine.Engine) error {
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if ch == nil {
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return errors.New("nil channel")
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}
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if ch.ChannelType() != "session" {
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ch.Reject(ssh.UnknownChannelType, "that is not the channel you are looking for")
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return errors.New("not a session")
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}
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channel, requests, err := ch.Accept()
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if err != nil {
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panic(err)
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}
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defer channel.Close()
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wg.Add(1)
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go func(reqIn <-chan *ssh.Request) {
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defer wg.Done()
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for req := range reqIn {
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req.Reply(req.Type == "shell", nil)
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}
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_ = requests
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}(requests)
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cont, err := en.Exec(ctx, []byte{})
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if err != nil {
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return fmt.Errorf("initial engine exec err: %v", err)
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}
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var input [state.INPUT_LIMIT]byte
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for cont {
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c, err := en.Flush(ctx, channel)
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if err != nil {
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return fmt.Errorf("flush err: %v", err)
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}
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_, err = channel.Write([]byte{0x0a})
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if err != nil {
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return fmt.Errorf("newline err: %v", err)
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}
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c, err = channel.Read(input[:])
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if err != nil {
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return fmt.Errorf("read input fail: %v", err)
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}
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logg.TraceCtxf(ctx, "input read", "c", c, "input", input[:c-1])
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cont, err = en.Exec(ctx, input[:c-1])
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if err != nil {
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return fmt.Errorf("engine exec err: %v", err)
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}
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logg.TraceCtxf(ctx, "exec cont", "cont", cont, "en", en)
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_ = c
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}
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c, err := en.Flush(ctx, channel)
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if err != nil {
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return fmt.Errorf("last flush err: %v", err)
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}
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_ = c
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return nil
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}
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type sshRunner struct {
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Ctx context.Context
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Cfg engine.Config
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FlagFile string
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DbDir string
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ResourceDir string
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Debug bool
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KeyFile string
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Host string
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Port uint
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}
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func(s *sshRunner) GetEngine(sessionId string) (engine.Engine, func(), error) {
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ctx := s.Ctx
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menuStorageService := storage.NewMenuStorageService(s.DbDir, s.ResourceDir)
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err := menuStorageService.EnsureDbDir()
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if err != nil {
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return nil, nil, err
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}
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rs, err := menuStorageService.GetResource(ctx)
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if err != nil {
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return nil, nil, err
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}
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pe, err := menuStorageService.GetPersister(ctx)
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if err != nil {
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return nil, nil, err
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}
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userdatastore, err := menuStorageService.GetUserdataDb(ctx)
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if err != nil {
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return nil, nil, err
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}
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dbResource, ok := rs.(*resource.DbResource)
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if !ok {
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return nil, nil, err
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}
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lhs, err := handlers.NewLocalHandlerService(s.FlagFile, true, dbResource, s.Cfg, rs)
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lhs.SetDataStore(&userdatastore)
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lhs.SetPersister(pe)
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lhs.Cfg.SessionId = sessionId
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if err != nil {
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return nil, nil, err
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}
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hl, err := lhs.GetHandler()
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if err != nil {
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return nil, nil, err
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}
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en := lhs.GetEngine()
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en = en.WithFirst(hl.Init)
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if s.Debug {
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en = en.WithDebug(nil)
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}
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// TODO: this is getting very hacky!
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closer := func() {
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err := menuStorageService.Close()
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if err != nil {
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logg.ErrorCtxf(ctx, "menu storage service cleanup fail", "err", err)
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}
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}
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return en, closer, nil
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}
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// adapted example from crypto/ssh package, NewServerConn doc
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func(s *sshRunner) Run(ctx context.Context) {
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running := true
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// TODO: waitgroup should probably not be global
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defer wg.Wait()
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auth := NewAuther(ctx)
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cfg := ssh.ServerConfig{
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PublicKeyCallback: auth.Check,
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}
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privateBytes, err := os.ReadFile(s.KeyFile)
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if err != nil {
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logg.ErrorCtxf(ctx, "Failed to load private key", "err", err)
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}
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private, err := ssh.ParsePrivateKey(privateBytes)
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if err != nil {
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logg.ErrorCtxf(ctx, "Failed to parse private key", "err", err)
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}
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cfg.AddHostKey(private)
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lst, err := net.Listen("tcp", fmt.Sprintf("%s:%d", s.Host, s.Port))
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if err != nil {
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panic(err)
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}
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for running {
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conn, err := lst.Accept()
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if err != nil {
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panic(err)
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}
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go func(conn net.Conn) {
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defer conn.Close()
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for true {
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srvConn, nC, rC, err := ssh.NewServerConn(conn, &cfg)
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if err != nil {
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logg.InfoCtxf(ctx, "rejected client", "err", err)
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return
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}
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logg.DebugCtxf(ctx, "ssh client connected", "conn", srvConn)
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wg.Add(1)
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go func() {
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ssh.DiscardRequests(rC)
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wg.Done()
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}()
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sessionId, err := auth.FromConn(srvConn)
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if err != nil {
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logg.ErrorCtxf(ctx, "Cannot find authentication")
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return
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}
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en, closer, err := s.GetEngine(sessionId)
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if err != nil {
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logg.ErrorCtxf(ctx, "engine won't start", "err", err)
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return
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}
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defer func() {
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err := en.Finish()
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if err != nil {
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logg.ErrorCtxf(ctx, "engine won't stop", "err", err)
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}
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closer()
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}()
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for ch := range nC {
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err = serve(ctx, sessionId, ch, en)
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logg.ErrorCtxf(ctx, "ssh server finish", "err", err)
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}
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}
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}(conn)
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}
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}
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// TODO: This is test code, move to external tool for adding and removing keys
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func sshLoadKeys(ctx context.Context, dbDir string) error {
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keyStoreFile := path.Join(dbDir, "ssh_authorized_keys.gdbm")
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keyStore = storage.NewThreadGdbmDb()
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err := keyStore.Connect(ctx, keyStoreFile)
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if err != nil {
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return err
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}
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pubKey, _, _, _, err := ssh.ParseAuthorizedKey([]byte("ssh-rsa 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 lash@furioso"))
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if err != nil {
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return err
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}
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k := append([]byte{0x01}, pubKey.Marshal()...)
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keyStore.SetPrefix(storage.DATATYPE_CUSTOM)
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return keyStore.Put(ctx, k, []byte("+25113243546"))
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}
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func main() {
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var dbDir string
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var resourceDir string
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@ -338,22 +63,30 @@ func main() {
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if engineDebug {
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cfg.EngineDebug = true
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}
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err = sshLoadKeys(ctx, dbDir)
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keyStoreFile := path.Join(dbDir, "ssh_authorized_keys.gdbm")
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authKeyStore := storage.NewThreadGdbmDb()
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err = authKeyStore.Connect(ctx, keyStoreFile)
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if err != nil {
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fmt.Fprintf(os.Stderr, err.Error())
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fmt.Fprintf(os.Stderr, "keystore file open error: %v", err)
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os.Exit(1)
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}
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defer func() {
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err := authKeyStore.Close()
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if err != nil {
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logg.ErrorCtxf(ctx, "keystore close error", "err", err)
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}
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}()
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runner := &sshRunner{
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runner := &ssh.SshRunner{
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Cfg: cfg,
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Debug: engineDebug,
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FlagFile: pfp,
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DbDir: dbDir,
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ResourceDir: resourceDir,
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KeyFile: sshKeyFile,
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SrvKeyFile: sshKeyFile,
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Host: host,
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Port: port,
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}
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runner.Run(ctx)
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runner.Run(ctx, authKeyStore)
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}
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279
internal/ssh/ssh.go
Normal file
279
internal/ssh/ssh.go
Normal file
@ -0,0 +1,279 @@
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package ssh
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import (
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"context"
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"encoding/hex"
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"errors"
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"fmt"
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"net"
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"os"
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"sync"
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"golang.org/x/crypto/ssh"
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"git.defalsify.org/vise.git/db"
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"git.defalsify.org/vise.git/engine"
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"git.defalsify.org/vise.git/logging"
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"git.defalsify.org/vise.git/resource"
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"git.defalsify.org/vise.git/state"
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"git.grassecon.net/urdt/ussd/internal/handlers"
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"git.grassecon.net/urdt/ussd/internal/storage"
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)
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var (
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logg = logging.NewVanilla().WithDomain("ssh")
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)
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type auther struct {
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Ctx context.Context
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keyStore db.Db
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auth map[string]string
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}
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func NewAuther(ctx context.Context, keyStore db.Db) *auther {
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return &auther{
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Ctx: ctx,
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keyStore: keyStore,
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auth: make(map[string]string),
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}
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}
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func(a *auther) Check(conn ssh.ConnMetadata, pubKey ssh.PublicKey) (*ssh.Permissions, error) {
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a.keyStore.SetLanguage(nil)
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a.keyStore.SetPrefix(storage.DATATYPE_CUSTOM)
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k := append([]byte{0x01}, pubKey.Marshal()...)
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v, err := a.keyStore.Get(a.Ctx, k)
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if err != nil {
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return nil, err
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}
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ka := hex.EncodeToString(conn.SessionID())
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va := string(v)
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a.auth[ka] = va
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fmt.Fprintf(os.Stderr, "connect: %s -> %s\n", ka, v)
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return nil, nil
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}
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func(a *auther) FromConn(c *ssh.ServerConn) (string, error) {
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if c == nil {
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return "", errors.New("nil server conn")
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}
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if c.Conn == nil {
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return "", errors.New("nil underlying conn")
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}
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return a.Get(c.Conn.SessionID())
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}
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func(a *auther) Get(k []byte) (string, error) {
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ka := hex.EncodeToString(k)
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v, ok := a.auth[ka]
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if !ok {
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return "", errors.New("not found")
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}
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return v, nil
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}
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func(s *SshRunner) serve(ctx context.Context, sessionId string, ch ssh.NewChannel, en engine.Engine) error {
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if ch == nil {
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return errors.New("nil channel")
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}
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if ch.ChannelType() != "session" {
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ch.Reject(ssh.UnknownChannelType, "that is not the channel you are looking for")
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return errors.New("not a session")
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}
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channel, requests, err := ch.Accept()
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if err != nil {
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panic(err)
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}
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defer channel.Close()
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s.wg.Add(1)
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go func(reqIn <-chan *ssh.Request) {
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defer s.wg.Done()
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for req := range reqIn {
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req.Reply(req.Type == "shell", nil)
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}
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_ = requests
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}(requests)
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cont, err := en.Exec(ctx, []byte{})
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if err != nil {
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return fmt.Errorf("initial engine exec err: %v", err)
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}
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var input [state.INPUT_LIMIT]byte
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for cont {
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c, err := en.Flush(ctx, channel)
|
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if err != nil {
|
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return fmt.Errorf("flush err: %v", err)
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}
|
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_, err = channel.Write([]byte{0x0a})
|
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if err != nil {
|
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return fmt.Errorf("newline err: %v", err)
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}
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c, err = channel.Read(input[:])
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if err != nil {
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return fmt.Errorf("read input fail: %v", err)
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}
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logg.TraceCtxf(ctx, "input read", "c", c, "input", input[:c-1])
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cont, err = en.Exec(ctx, input[:c-1])
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if err != nil {
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return fmt.Errorf("engine exec err: %v", err)
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}
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logg.TraceCtxf(ctx, "exec cont", "cont", cont, "en", en)
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_ = c
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}
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c, err := en.Flush(ctx, channel)
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if err != nil {
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return fmt.Errorf("last flush err: %v", err)
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}
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_ = c
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return nil
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}
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type SshRunner struct {
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Ctx context.Context
|
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Cfg engine.Config
|
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FlagFile string
|
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DbDir string
|
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ResourceDir string
|
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Debug bool
|
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SrvKeyFile string
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Host string
|
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Port uint
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wg sync.WaitGroup
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}
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|
||||
func(s *SshRunner) GetEngine(sessionId string) (engine.Engine, func(), error) {
|
||||
ctx := s.Ctx
|
||||
menuStorageService := storage.NewMenuStorageService(s.DbDir, s.ResourceDir)
|
||||
|
||||
err := menuStorageService.EnsureDbDir()
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
|
||||
rs, err := menuStorageService.GetResource(ctx)
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
|
||||
pe, err := menuStorageService.GetPersister(ctx)
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
|
||||
userdatastore, err := menuStorageService.GetUserdataDb(ctx)
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
|
||||
dbResource, ok := rs.(*resource.DbResource)
|
||||
if !ok {
|
||||
return nil, nil, err
|
||||
}
|
||||
|
||||
lhs, err := handlers.NewLocalHandlerService(s.FlagFile, true, dbResource, s.Cfg, rs)
|
||||
lhs.SetDataStore(&userdatastore)
|
||||
lhs.SetPersister(pe)
|
||||
lhs.Cfg.SessionId = sessionId
|
||||
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
|
||||
hl, err := lhs.GetHandler()
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
|
||||
en := lhs.GetEngine()
|
||||
en = en.WithFirst(hl.Init)
|
||||
if s.Debug {
|
||||
en = en.WithDebug(nil)
|
||||
}
|
||||
// TODO: this is getting very hacky!
|
||||
closer := func() {
|
||||
err := menuStorageService.Close()
|
||||
if err != nil {
|
||||
logg.ErrorCtxf(ctx, "menu storage service cleanup fail", "err", err)
|
||||
}
|
||||
}
|
||||
return en, closer, nil
|
||||
}
|
||||
|
||||
// adapted example from crypto/ssh package, NewServerConn doc
|
||||
func(s *SshRunner) Run(ctx context.Context, keyStore db.Db) {
|
||||
running := true
|
||||
|
||||
// TODO: waitgroup should probably not be global
|
||||
defer s.wg.Wait()
|
||||
|
||||
auth := NewAuther(ctx, keyStore)
|
||||
cfg := ssh.ServerConfig{
|
||||
PublicKeyCallback: auth.Check,
|
||||
}
|
||||
|
||||
privateBytes, err := os.ReadFile(s.SrvKeyFile)
|
||||
if err != nil {
|
||||
logg.ErrorCtxf(ctx, "Failed to load private key", "err", err)
|
||||
}
|
||||
private, err := ssh.ParsePrivateKey(privateBytes)
|
||||
if err != nil {
|
||||
logg.ErrorCtxf(ctx, "Failed to parse private key", "err", err)
|
||||
}
|
||||
cfg.AddHostKey(private)
|
||||
|
||||
lst, err := net.Listen("tcp", fmt.Sprintf("%s:%d", s.Host, s.Port))
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
|
||||
for running {
|
||||
conn, err := lst.Accept()
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
|
||||
|
||||
go func(conn net.Conn) {
|
||||
defer conn.Close()
|
||||
for true {
|
||||
srvConn, nC, rC, err := ssh.NewServerConn(conn, &cfg)
|
||||
if err != nil {
|
||||
logg.InfoCtxf(ctx, "rejected client", "err", err)
|
||||
return
|
||||
}
|
||||
logg.DebugCtxf(ctx, "ssh client connected", "conn", srvConn)
|
||||
|
||||
s.wg.Add(1)
|
||||
go func() {
|
||||
ssh.DiscardRequests(rC)
|
||||
s.wg.Done()
|
||||
}()
|
||||
|
||||
sessionId, err := auth.FromConn(srvConn)
|
||||
if err != nil {
|
||||
logg.ErrorCtxf(ctx, "Cannot find authentication")
|
||||
return
|
||||
}
|
||||
en, closer, err := s.GetEngine(sessionId)
|
||||
if err != nil {
|
||||
logg.ErrorCtxf(ctx, "engine won't start", "err", err)
|
||||
return
|
||||
}
|
||||
defer func() {
|
||||
err := en.Finish()
|
||||
if err != nil {
|
||||
logg.ErrorCtxf(ctx, "engine won't stop", "err", err)
|
||||
}
|
||||
closer()
|
||||
}()
|
||||
for ch := range nC {
|
||||
err = s.serve(ctx, sessionId, ch, en)
|
||||
logg.ErrorCtxf(ctx, "ssh server finish", "err", err)
|
||||
}
|
||||
}
|
||||
}(conn)
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user