[client,signal,management] Add browser client support (#4415)

client/ssh/client.go

@@ -1,3 +1,5 @@
+//go:build !js
+
 package ssh
 
 import (

client/ssh/login.go

@@ -1,3 +1,5 @@
+//go:build !js
+
 package ssh
 
 import (

client/ssh/server.go

@@ -1,3 +1,5 @@
+//go:build !js
+
 package ssh
 
 import (

client/ssh/server_mock.go

@@ -1,3 +1,5 @@
+//go:build !js
+
 package ssh
 
 import "context"

client/ssh/server_test.go

@@ -1,3 +1,5 @@
+//go:build !js
+
 package ssh
 
 import (

client/ssh/ssh_js.go

@@ -0,0 +1,137 @@
+package ssh
+
+import (
+	"context"
+	"crypto/ed25519"
+	"crypto/rand"
+	"crypto/x509"
+	"encoding/pem"
+	"errors"
+	"strings"
+
+	"golang.org/x/crypto/ssh"
+)
+
+var ErrSSHNotSupported = errors.New("SSH is not supported in WASM environment")
+
+// Server is a dummy SSH server interface for WASM.
+type Server interface {
+	Start() error
+	Stop() error
+	EnableSSH(enabled bool)
+	AddAuthorizedKey(peer string, key string) error
+	RemoveAuthorizedKey(key string)
+}
+
+type dummyServer struct{}
+
+func DefaultSSHServer(hostKeyPEM []byte, addr string) (Server, error) {
+	return &dummyServer{}, nil
+}
+
+func NewServer(addr string) Server {
+	return &dummyServer{}
+}
+
+func (s *dummyServer) Start() error {
+	return ErrSSHNotSupported
+}
+
+func (s *dummyServer) Stop() error {
+	return nil
+}
+
+func (s *dummyServer) EnableSSH(enabled bool) {
+}
+
+func (s *dummyServer) AddAuthorizedKey(peer string, key string) error {
+	return nil
+}
+
+func (s *dummyServer) RemoveAuthorizedKey(key string) {
+}
+
+type Client struct{}
+
+func NewClient(ctx context.Context, addr string, config interface{}, recorder *SessionRecorder) (*Client, error) {
+	return nil, ErrSSHNotSupported
+}
+
+func (c *Client) Close() error {
+	return nil
+}
+
+func (c *Client) Run(command []string) error {
+	return ErrSSHNotSupported
+}
+
+type SessionRecorder struct{}
+
+func NewSessionRecorder() *SessionRecorder {
+	return &SessionRecorder{}
+}
+
+func (r *SessionRecorder) Record(session string, data []byte) {
+}
+
+func GetUserShell() string {
+	return "/bin/sh"
+}
+
+func LookupUserInfo(username string) (string, string, error) {
+	return "", "", ErrSSHNotSupported
+}
+
+const DefaultSSHPort = 44338
+
+const ED25519 = "ed25519"
+
+func isRoot() bool {
+	return false
+}
+
+func GeneratePrivateKey(keyType string) ([]byte, error) {
+	if keyType != ED25519 {
+		return nil, errors.New("only ED25519 keys are supported in WASM")
+	}
+
+	_, privateKey, err := ed25519.GenerateKey(rand.Reader)
+	if err != nil {
+		return nil, err
+	}
+
+	pkcs8Bytes, err := x509.MarshalPKCS8PrivateKey(privateKey)
+	if err != nil {
+		return nil, err
+	}
+
+	pemBlock := &pem.Block{
+		Type:  "PRIVATE KEY",
+		Bytes: pkcs8Bytes,
+	}
+
+	pemBytes := pem.EncodeToMemory(pemBlock)
+	return pemBytes, nil
+}
+
+func GeneratePublicKey(privateKey []byte) ([]byte, error) {
+	signer, err := ssh.ParsePrivateKey(privateKey)
+	if err != nil {
+		block, _ := pem.Decode(privateKey)
+		if block != nil {
+			key, err := x509.ParsePKCS8PrivateKey(block.Bytes)
+			if err != nil {
+				return nil, err
+			}
+			signer, err = ssh.NewSignerFromKey(key)
+			if err != nil {
+				return nil, err
+			}
+		} else {
+			return nil, err
+		}
+	}
+
+	pubKeyBytes := ssh.MarshalAuthorizedKey(signer.PublicKey())
+	return []byte(strings.TrimSpace(string(pubKeyBytes))), nil
+}

client/ssh/util.go

@@ -1,3 +1,5 @@
+//go:build !js
+
 package ssh
 
 import (