cmd/ssh/main.go

@@ -6,13 +6,14 @@ import (
 	"fmt"
 	"path"
 	"os"
+	"os/signal"
 	"sync"
+	"syscall"
 
 	"git.defalsify.org/vise.git/db"
 	"git.defalsify.org/vise.git/engine"
 	"git.defalsify.org/vise.git/logging"
 
-	"git.grassecon.net/urdt/ussd/internal/storage"
 	"git.grassecon.net/urdt/ussd/internal/ssh"
 )
 
@@ -47,9 +48,15 @@ func main() {
 		os.Exit(1)
 	}
 
+	ctx := context.Background()
+	logg.WarnCtxf(ctx, "!!!!! WARNING WARNING WARNING")
+	logg.WarnCtxf(ctx, "!!!!! =======================")
+	logg.WarnCtxf(ctx, "!!!!! This is not a production ready server!")
+	logg.WarnCtxf(ctx, "!!!!! Do not expose to internet and only use with tunnel!")
+	logg.WarnCtxf(ctx, "!!!!! (See ssh -L <...>)")
+
 	logg.Infof("start command", "dbdir", dbDir, "resourcedir", resourceDir, "outputsize", size, "keyfile", sshKeyFile, "host", host, "port", port)
 
-	ctx := context.Background()
 	pfp := path.Join(scriptDir, "pp.csv")
 
 	cfg := engine.Config{
@@ -64,20 +71,24 @@ func main() {
 		cfg.EngineDebug = true
 	}
 
-	keyStoreFile := path.Join(dbDir, "ssh_authorized_keys.gdbm")
-	authKeyStore := storage.NewThreadGdbmDb()
-	err = authKeyStore.Connect(ctx, keyStoreFile)
+	authKeyStore, err := ssh.NewSshKeyStore(ctx, dbDir)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "keystore file open error: %v", err)
 		os.Exit(1)
 	}
 	defer func () {
-		err := authKeyStore.Close()
+		logg.TraceCtxf(ctx, "shutdown auth key store reached")
+		err = authKeyStore.Close()
 		if err != nil {
 			logg.ErrorCtxf(ctx, "keystore close error", "err", err)
 		}
 	}()
 
+	cint := make(chan os.Signal)
+	cterm := make(chan os.Signal)
+	signal.Notify(cint, os.Interrupt, syscall.SIGINT)
+	signal.Notify(cterm, os.Interrupt, syscall.SIGTERM)
+
 	runner := &ssh.SshRunner{
 		Cfg: cfg,
 		Debug: engineDebug,
@@ -88,5 +99,17 @@ func main() {
 		Host: host,
 		Port: port,
 	}
+	go func() {
+		select {
+		case _ = <-cint:
+		case _ = <-cterm:
+		}
+		logg.TraceCtxf(ctx, "shutdown runner reached")
+		err := runner.Stop()
+		if err != nil {
+			logg.ErrorCtxf(ctx, "runner stop error", "err", err)
+		}
+		
+	}()
 	runner.Run(ctx, authKeyStore)
 }

cmd/ssh/sshkey/main.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"os"
+
+	"git.grassecon.net/urdt/ussd/internal/ssh"
+)
+
+func main() {
+	var dbDir string
+	var sessionId string
+	flag.StringVar(&dbDir, "dbdir", ".state", "database dir to read from")
+	flag.StringVar(&sessionId, "i", "", "session id")
+	flag.Parse()
+
+	if sessionId == "" {
+		fmt.Fprintf(os.Stderr, "empty session id\n")
+		os.Exit(1)
+	}
+
+	ctx := context.Background()
+
+	sshKeyFile := flag.Arg(0)
+	if sshKeyFile == "" {
+		fmt.Fprintf(os.Stderr, "missing key file argument\n")
+		os.Exit(1)
+	}
+
+	store, err := ssh.NewSshKeyStore(ctx, dbDir)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "%v\n", err)
+		os.Exit(1)
+	}
+	defer store.Close()
+
+	err = store.AddFromFile(ctx, sshKeyFile, sessionId)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "%v\n", err)
+		os.Exit(1)
+	}
+}

internal/ssh/keystore.go

@@ -0,0 +1,64 @@
+package ssh
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"path"
+
+	"golang.org/x/crypto/ssh"
+
+	"git.defalsify.org/vise.git/db"
+
+	"git.grassecon.net/urdt/ussd/internal/storage"
+)
+
+type SshKeyStore struct {
+	store db.Db
+}
+
+func NewSshKeyStore(ctx context.Context, dbDir string) (*SshKeyStore, error) {
+	keyStore := &SshKeyStore{}
+	keyStoreFile := path.Join(dbDir, "ssh_authorized_keys.gdbm")
+	keyStore.store = storage.NewThreadGdbmDb()
+	err := keyStore.store.Connect(ctx, keyStoreFile)
+	if err != nil {
+		return nil, err
+	}
+	return keyStore, nil
+}
+
+func(s *SshKeyStore) AddFromFile(ctx context.Context, fp string, sessionId string) error {
+	_, err := os.Stat(fp)
+	if err != nil {
+		return fmt.Errorf("cannot open ssh server public key file: %v\n", err)
+	}
+
+	publicBytes, err := os.ReadFile(fp)
+	if err != nil {
+		return fmt.Errorf("Failed to load public key: %v", err)
+	}
+	pubKey, _, _, _, err := ssh.ParseAuthorizedKey(publicBytes)
+	if err != nil {
+		return fmt.Errorf("Failed to parse public key: %v", err)
+	}
+	k := append([]byte{0x01}, pubKey.Marshal()...)
+	s.store.SetPrefix(storage.DATATYPE_CUSTOM)
+	logg.Infof("Added key", "sessionId", sessionId, "public key", string(publicBytes))
+	return s.store.Put(ctx, k, []byte(sessionId))
+}
+
+func(s *SshKeyStore) Get(ctx context.Context, pubKey ssh.PublicKey) (string, error) {
+	s.store.SetLanguage(nil)
+	s.store.SetPrefix(storage.DATATYPE_CUSTOM)
+	k := append([]byte{0x01}, pubKey.Marshal()...)
+	v, err := s.store.Get(ctx, k)
+	if err != nil {
+		return "", err
+	}
+	return string(v), nil
+}
+
+func(s *SshKeyStore) Close() error {
+	return s.store.Close()
+}

internal/ssh/ssh.go

@@ -11,7 +11,6 @@ import (
 
 	"golang.org/x/crypto/ssh"
 
-	"git.defalsify.org/vise.git/db"
 	"git.defalsify.org/vise.git/engine"
 	"git.defalsify.org/vise.git/logging"
 	"git.defalsify.org/vise.git/resource"
@@ -27,11 +26,11 @@ var (
 
 type auther struct {
 	Ctx context.Context
-	keyStore db.Db
+	keyStore *SshKeyStore
 	auth map[string]string
 }
 
-func NewAuther(ctx context.Context, keyStore db.Db) *auther {
+func NewAuther(ctx context.Context, keyStore *SshKeyStore) *auther {
 	return &auther{
 		Ctx: ctx,
 		keyStore: keyStore,
@@ -40,17 +39,13 @@ func NewAuther(ctx context.Context, keyStore db.Db) *auther {
 }
 
 func(a *auther) Check(conn ssh.ConnMetadata, pubKey ssh.PublicKey) (*ssh.Permissions, error) {
-	a.keyStore.SetLanguage(nil)
-	a.keyStore.SetPrefix(storage.DATATYPE_CUSTOM)
-	k := append([]byte{0x01}, pubKey.Marshal()...)
-	v, err := a.keyStore.Get(a.Ctx, k)
+	va, err := a.keyStore.Get(a.Ctx, pubKey)
 	if err != nil {
 		return nil, err
 	}
 	ka := hex.EncodeToString(conn.SessionID())
-	va := string(v)
 	a.auth[ka] = va 
-	fmt.Fprintf(os.Stderr, "connect: %s -> %s\n", ka, v)
+	fmt.Fprintf(os.Stderr, "connect: %s -> %s\n", ka, va)
 	return nil, nil
 }
 
@@ -142,6 +137,11 @@ type SshRunner struct {
 	Host string
 	Port uint
 	wg sync.WaitGroup
+	lst net.Listener
+}
+
+func(s *SshRunner) Stop() error {
+	return s.lst.Close()
 }
 
 func(s *SshRunner) GetEngine(sessionId string) (engine.Engine, func(), error) {
@@ -203,7 +203,7 @@ func(s *SshRunner) GetEngine(sessionId string) (engine.Engine, func(), error) {
 }
 
 // adapted example from crypto/ssh package, NewServerConn doc
-func(s *SshRunner) Run(ctx context.Context, keyStore db.Db) {
+func(s *SshRunner) Run(ctx context.Context, keyStore *SshKeyStore) {
 	running := true
 
 	// TODO: waitgroup should probably not be global
@@ -224,18 +224,19 @@ func(s *SshRunner) Run(ctx context.Context, keyStore db.Db) {
 	}
 	cfg.AddHostKey(private)
 
-	lst, err := net.Listen("tcp", fmt.Sprintf("%s:%d", s.Host, s.Port))
+	s.lst, err = net.Listen("tcp", fmt.Sprintf("%s:%d", s.Host, s.Port))
 	if err != nil {
 		panic(err)
 	}
 
 	for running {
-		conn, err := lst.Accept()
+		conn, err := s.lst.Accept()
 		if err != nil {
-			panic(err)
+			logg.ErrorCtxf(ctx, "ssh accept error", "err", err)
+			running = false
+			continue
 		}
 
-
 		go func(conn net.Conn) {
 			defer conn.Close()
 			for true {