feat: SSH terminal - the agent connects by SSH to another host (password, key file or its own keys) and the shell opens in a tab with the connection's progress shown; host keys trusted on first use, a changed one refused

internal/agent/client.go

@@ -276,6 +276,10 @@ func (a *Agent) dispatch(ctx context.Context, msg proto.ControlMessage) {
 		go a.runForward(ctx, msg.SessionID, msg.Port)
 	case proto.CtrlTask:
 		go a.runTask(ctx, msg.TaskID)
+	case proto.CtrlOpenSSH:
+		if msg.SSH != nil {
+			go a.runSSH(ctx, msg.SessionID, *msg.SSH)
+		}
 	}
 }
 

internal/agent/ssh.go

@@ -0,0 +1,238 @@
+package agent
+
+import (
+	"bufio"
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"log"
+	"net"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"golang.org/x/crypto/ssh"
+
+	"github.com/x-grk/longpolling-remote-access/internal/proto"
+)
+
+// An SSH terminal: the agent connects to another host by SSH and bridges the
+// remote shell to the session, as it does a local one. The panel is told how
+// the connection goes (connecting, signing in, in) to show it.
+
+// sshKnownHosts holds the host keys seen, next to the agent's state: a host
+// is trusted the first time, and a changed key is refused.
+func (a *Agent) sshKnownHosts() string {
+	return filepath.Join(filepath.Dir(a.cfg.StatePath), "ssh_known_hosts")
+}
+
+var knownHostsMu sync.Mutex
+
+// hostKeyCheck trusts a new host and remembers its key; a host whose key
+// has changed since is refused, as ssh would.
+func (a *Agent) hostKeyCheck(seen *string) ssh.HostKeyCallback {
+	return func(hostname string, _ net.Addr, key ssh.PublicKey) error {
+		knownHostsMu.Lock()
+		defer knownHostsMu.Unlock()
+		fp := ssh.FingerprintSHA256(key)
+		*seen = fp
+		path := a.sshKnownHosts()
+		line := hostname + " " + key.Type() + " "
+		if f, err := os.Open(path); err == nil {
+			sc := bufio.NewScanner(f)
+			for sc.Scan() {
+				fields := strings.Fields(sc.Text())
+				if len(fields) != 3 || fields[0] != hostname {
+					continue
+				}
+				if fields[1] == key.Type() && fields[2] == fp {
+					f.Close()
+					return nil
+				}
+				if fields[1] == key.Type() {
+					f.Close()
+					return fmt.Errorf("ключ хоста %s изменился: был %s, теперь %s. Если так и должно быть, удалите строку с этим хостом из %s на агенте",
+						hostname, fields[2], fp, path)
+				}
+			}
+			f.Close()
+		}
+		_ = os.MkdirAll(filepath.Dir(path), 0o700)
+		f, err := os.OpenFile(path, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0o600)
+		if err == nil {
+			_, _ = f.WriteString(line + fp + "\n")
+			f.Close()
+		}
+		return nil
+	}
+}
+
+// sshAuth is how to sign in: the key given, the password given (also
+// answered to keyboard-interactive prompts), or the agent user's own keys.
+func sshAuth(t proto.SSHTarget) ([]ssh.AuthMethod, error) {
+	var methods []ssh.AuthMethod
+	if t.Key != "" {
+		var signer ssh.Signer
+		var err error
+		if t.Passphrase != "" {
+			signer, err = ssh.ParsePrivateKeyWithPassphrase([]byte(t.Key), []byte(t.Passphrase))
+		} else {
+			signer, err = ssh.ParsePrivateKey([]byte(t.Key))
+		}
+		var missing *ssh.PassphraseMissingError
+		if errors.As(err, &missing) {
+			return nil, errors.New("ключ защищён фразой - введите её")
+		}
+		if err != nil {
+			return nil, fmt.Errorf("ключ не читается: %v", err)
+		}
+		methods = append(methods, ssh.PublicKeys(signer))
+	}
+	if t.Password != "" {
+		pw := t.Password
+		methods = append(methods, ssh.Password(pw),
+			ssh.KeyboardInteractive(func(_, _ string, qs []string, _ []bool) ([]string, error) {
+				ans := make([]string, len(qs))
+				for i := range ans {
+					ans[i] = pw
+				}
+				return ans, nil
+			}))
+	}
+	if len(methods) == 0 {
+		var signers []ssh.Signer
+		for _, n := range []string{"id_ed25519", "id_ecdsa", "id_rsa"} {
+			b, err := os.ReadFile(filepath.Join(homeDir(""), ".ssh", n))
+			if err != nil {
+				continue
+			}
+			if s, err := ssh.ParsePrivateKey(b); err == nil {
+				signers = append(signers, s)
+			}
+		}
+		if len(signers) == 0 {
+			return nil, errors.New("не задан ни пароль, ни ключ, и в ~/.ssh агента нет ключей без фразы")
+		}
+		methods = append(methods, ssh.PublicKeys(signers...))
+	}
+	return methods, nil
+}
+
+// sshShell is the remote shell as a stream: its output (stdout and stderr,
+// one on a PTY) to read, keystrokes to write.
+type sshShell struct {
+	client *ssh.Client
+	sess   *ssh.Session
+	stdin  io.WriteCloser
+	out    *io.PipeReader
+	once   sync.Once
+}
+
+func (s *sshShell) Read(b []byte) (int, error)  { return s.out.Read(b) }
+func (s *sshShell) Write(b []byte) (int, error) { return s.stdin.Write(b) }
+func (s *sshShell) Resize(cols, rows uint16) {
+	if cols > 0 && rows > 0 {
+		_ = s.sess.WindowChange(int(rows), int(cols))
+	}
+}
+func (s *sshShell) Close() error {
+	s.once.Do(func() {
+		_ = s.sess.Close()
+		_ = s.client.Close()
+		_ = s.out.Close()
+	})
+	return nil
+}
+
+// runSSH connects to the target and bridges its shell to the session.
+func (a *Agent) runSSH(parent context.Context, sid string, t proto.SSHTarget) {
+	status := func(st, note string) {
+		a.postOut(context.Background(), sid, proto.OutMessage{Status: st, Note: note})
+	}
+	fail := func(err error) {
+		log.Printf("ssh %s: %v", sid, err)
+		status(proto.SSHErr, err.Error())
+		a.postOut(context.Background(), sid, proto.OutMessage{Data: b64.EncodeToString([]byte("\x1b[31m" + err.Error() + "\x1b[0m\r\n"))})
+		a.postOut(context.Background(), sid, proto.OutMessage{Exit: true})
+	}
+	if t.Port == 0 {
+		t.Port = 22
+	}
+	addr := net.JoinHostPort(t.Host, strconv.Itoa(t.Port))
+	auth, err := sshAuth(t)
+	if err != nil {
+		fail(err)
+		return
+	}
+	status(proto.SSHDial, "подключение к "+addr)
+	d := net.Dialer{Timeout: 15 * time.Second, KeepAlive: 30 * time.Second}
+	conn, err := d.DialContext(parent, "tcp", addr)
+	if err != nil {
+		fail(fmt.Errorf("не подключиться к %s: %v", addr, err))
+		return
+	}
+	status(proto.SSHAuth, "вход как "+t.User)
+	var fp string
+	_ = conn.SetDeadline(time.Now().Add(30 * time.Second))
+	c, chans, reqs, err := ssh.NewClientConn(conn, addr, &ssh.ClientConfig{
+		User:            t.User,
+		Auth:            auth,
+		HostKeyCallback: a.hostKeyCheck(&fp),
+		Timeout:         15 * time.Second,
+	})
+	if err != nil {
+		conn.Close()
+		msg := strings.TrimPrefix(err.Error(), "ssh: handshake failed: ")
+		if strings.Contains(msg, "unable to authenticate") {
+			msg = "сервер не принял вход как " + t.User + " - проверьте пароль или ключ"
+		}
+		fail(errors.New(msg))
+		return
+	}
+	_ = conn.SetDeadline(time.Time{})
+	client := ssh.NewClient(c, chans, reqs)
+	sess, err := client.NewSession()
+	if err != nil {
+		client.Close()
+		fail(fmt.Errorf("сессия не открылась: %v", err))
+		return
+	}
+	modes := ssh.TerminalModes{ssh.ECHO: 1, ssh.TTY_OP_ISPEED: 115200, ssh.TTY_OP_OSPEED: 115200}
+	if err := sess.RequestPty("xterm-256color", 24, 80, modes); err != nil {
+		sess.Close()
+		client.Close()
+		fail(fmt.Errorf("терминал не выделен: %v", err))
+		return
+	}
+	stdin, _ := sess.StdinPipe()
+	pr, pw := io.Pipe()
+	sess.Stdout = pw
+	sess.Stderr = pw
+	if err := sess.Shell(); err != nil {
+		sess.Close()
+		client.Close()
+		fail(fmt.Errorf("оболочка не запустилась: %v", err))
+		return
+	}
+	sh := &sshShell{client: client, sess: sess, stdin: stdin, out: pr}
+	go func() { _ = sess.Wait(); pw.Close() }()
+	// Keep-alives, so a dead host is noticed and the session ends.
+	go func() {
+		tk := time.NewTicker(30 * time.Second)
+		defer tk.Stop()
+		for range tk.C {
+			if _, _, err := client.SendRequest("keepalive@openssh.com", true, nil); err != nil {
+				sh.Close()
+				return
+			}
+		}
+	}()
+	log.Printf("ssh %s: %s@%s up (host key %s)", sid, t.User, addr, fp)
+	status(proto.SSHOK, t.User+"@"+addr+" · "+fp)
+	a.bridgeStream(parent, sid, sh, sh.Resize)
+	log.Printf("ssh %s: ended", sid)
+}

internal/proto/proto.go

@@ -18,8 +18,23 @@ const (
 	CtrlOpenForward = "open_forward"
 	// CtrlTask tells the agent to fetch and run the one-shot task TaskID.
 	CtrlTask = "task"
+	// CtrlOpenSSH tells the agent to open an SSH connection to SSH and bridge
+	// its shell to the session id, as a terminal.
+	CtrlOpenSSH = "open_ssh"
 )
 
+// SSHTarget is where an SSH terminal connects and how it signs in: a
+// password, a private key (PEM or OpenSSH, with its passphrase if it has
+// one), or, with neither, the agent user's own keys in ~/.ssh.
+type SSHTarget struct {
+	Host       string `json:"host"`
+	Port       int    `json:"port,omitempty"`
+	User       string `json:"user"`
+	Password   string `json:"password,omitempty"`
+	Key        string `json:"key,omitempty"`
+	Passphrase string `json:"passphrase,omitempty"`
+}
+
 // EnrollRequest is sent once by a freshly installed agent.
 type EnrollRequest struct {
 	Name     string `json:"name"`
@@ -38,11 +53,12 @@ type EnrollResponse struct {
 
 // ControlMessage is the body returned by the control long-poll.
 type ControlMessage struct {
-	Type      string `json:"type"`
+	Type      string     `json:"type"`
-	SessionID string `json:"session_id,omitempty"`
+	SessionID string     `json:"session_id,omitempty"`
-	Port      int    `json:"port,omitempty"`    // CtrlOpenForward: client-side port to dial
+	Port      int        `json:"port,omitempty"`    // CtrlOpenForward: client-side port to dial
-	TaskID    string `json:"task_id,omitempty"` // CtrlTask
+	TaskID    string     `json:"task_id,omitempty"` // CtrlTask
-	User      string `json:"user,omitempty"`    // CtrlOpenTerminal: OS user for the shell ("" = the agent's own)
+	User      string     `json:"user,omitempty"`    // CtrlOpenTerminal: OS user for the shell ("" = the agent's own)
+	SSH       *SSHTarget `json:"ssh,omitempty"`     // CtrlOpenSSH
 }
 
 // Transports an agent can reach the server by.
@@ -96,8 +112,20 @@ type InBatch struct {
 type OutMessage struct {
 	Data string `json:"data,omitempty"` // base64 bytes
 	Exit bool   `json:"exit,omitempty"`
+	// Status tells the panel how an SSH terminal's connection goes: one of
+	// the SSHStatus values, with Note to show.
+	Status string `json:"status,omitempty"`
+	Note   string `json:"note,omitempty"`
 }
 
+// The steps of an SSH terminal's connection, as OutMessage.Status.
+const (
+	SSHDial = "dial" // connecting to the host
+	SSHAuth = "auth" // the host answered, signing in
+	SSHOK   = "ok"   // signed in, the shell runs
+	SSHErr  = "err"  // it failed; Note says why
+)
+
 // --- one-shot tasks (file manager, native in the agent) ---
 
 const (

internal/server/handlers_panel_term.go

@@ -3,8 +3,12 @@ package server
 import (
 	"context"
 	"encoding/json"
+	"io"
 	"log"
+	"net"
 	"net/http"
+	"strconv"
+	"strings"
 	"time"
 
 	"github.com/coder/websocket"
@@ -17,7 +21,9 @@ import (
 // same transport the agent uses), so it works through any reverse proxy without
 // WebSocket upgrade support.
 
-// POST /api/panel/term/{agentID}/open - create a terminal session.
+// POST /api/panel/term/{agentID}/open - create a terminal session: a shell
+// on the agent, or with {"ssh": {...}} in the body a shell the agent opens
+// by SSH on another host.
 func (s *Server) handlePanelOpen(w http.ResponseWriter, r *http.Request) {
 	agentID := r.PathValue("agentID")
 	agent, err := s.db.GetAgent(agentID)
@@ -26,6 +32,33 @@ func (s *Server) handlePanelOpen(w http.ResponseWriter, r *http.Request) {
 		http.NotFound(w, r)
 		return
 	}
+	var body struct {
+		SSH *proto.SSHTarget `json:"ssh"`
+	}
+	if r.ContentLength != 0 {
+		if err := json.NewDecoder(http.MaxBytesReader(w, r.Body, 64<<10)).Decode(&body); err != nil && err != io.EOF {
+			http.Error(w, "bad request", http.StatusBadRequest)
+			return
+		}
+	}
+	if t := body.SSH; t != nil {
+		t.Host, t.User = strings.TrimSpace(t.Host), strings.TrimSpace(t.User)
+		if t.Port == 0 {
+			t.Port = 22
+		}
+		if t.Host == "" || t.User == "" || t.Port < 1 || t.Port > 65535 || strings.ContainsAny(t.Host+t.User, " \t\r\n/") {
+			w.Header().Set("Content-Type", "application/json")
+			w.WriteHeader(http.StatusBadRequest)
+			_ = json.NewEncoder(w).Encode(map[string]string{"error": "нужны хост, порт 1-65535 и пользователь"})
+			return
+		}
+		sess := s.hub.CreateSSH(agentID, *t)
+		if admin := s.currentAdmin(r); admin != nil {
+			s.db.Audit(admin.ID, agentID, "open_ssh:"+t.User+"@"+net.JoinHostPort(t.Host, strconv.Itoa(t.Port)))
+		}
+		writeJSON(w, map[string]string{"session_id": sess.ID})
+		return
+	}
 	sess := s.hub.CreateSession(agentID, agent.LoginUser)
 	if admin := s.currentAdmin(r); admin != nil {
 		s.db.Audit(admin.ID, agentID, "open_terminal:"+agent.TerminalUser())

internal/server/hub.go

@@ -100,6 +100,13 @@ func (h *Hub) CreateSession(agentID, user string) *Session {
 	return s
 }
 
+// CreateSSH registers a terminal session the agent opens by SSH to t.
+func (h *Hub) CreateSSH(agentID string, t proto.SSHTarget) *Session {
+	s := h.newSession(agentID)
+	h.enqueueJob(agentID, proto.ControlMessage{Type: proto.CtrlOpenSSH, SessionID: s.ID, SSH: &t})
+	return s
+}
+
 // CreateForward registers a port-forward stream (agent dials 127.0.0.1:port).
 func (h *Hub) CreateForward(agentID string, port int) *Session {
 	s := h.newSession(agentID)

internal/server/web/static/terminal.js

@@ -30,8 +30,11 @@
 
   // ---------- one shell ----------
   class Session {
-    constructor(agent) {
+    // ssh, when given, is where the agent connects by SSH for this shell:
+    // {host, port, user} and the secret to sign in with, sent once on open.
+    constructor(agent, ssh) {
       this.agent = agent;
+      this.ssh = ssh || null;
       this.sid = null; this.closed = false; this.connected = false;
       this.state = 'wait'; this.text = 'подключение…';
       this.inSeq = 0; this.inBusy = false; this.inQueue = [];
@@ -40,8 +43,9 @@
       this.el.innerHTML = '<div class="pane-head"><span class="dot wait"></span><span class="pane-title"></span>' +
         '<button type="button" class="pane-x" title="Закрыть терминал" aria-label="Закрыть терминал">' + X + '</button></div>' +
         '<div class="pane-body"></div>';
-      this.el.querySelector('.pane-title').textContent = agent.user + '@' + agent.host;
+      this.el.querySelector('.pane-title').textContent = who(this);
-      this.el.querySelector('.pane-title').title = agent.name;
+      this.el.querySelector('.pane-title').title = ssh ? 'SSH через ' + agent.name : agent.name;
+      if (ssh) this.el.querySelector('.dot').insertAdjacentHTML('afterend', '<span class="badge-ssh">SSH</span>');
       this.term = new Terminal({
         cursorBlink: true, fontSize: touch ? 13 : 14,
         fontFamily: 'ui-monospace, SFMono-Regular, Menlo, monospace', theme: { background: '#0c0f13' }
@@ -67,14 +71,29 @@
     }
     async open() {
       try {
-        const r = await fetch(base + encodeURIComponent(this.agent.id) + '/open', { method: 'POST' });
+        let opt = { method: 'POST' };
+        if (this.ssh) {
+          opt = { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ ssh: this.ssh }) };
+          // The password or key goes once, to the agent; the page keeps no copy.
+          this.ssh = { host: this.ssh.host, port: this.ssh.port, user: this.ssh.user };
+        }
+        const r = await fetch(base + encodeURIComponent(this.agent.id) + '/open', opt);
         if (!r.ok) {
-          this.setState('err', 'ошибка открытия (' + r.status + ')');
+          let why = 'HTTP ' + r.status;
-          this.term.write('\r\n\x1b[31m[не удалось открыть сессию: HTTP ' + r.status + ']\x1b[0m\r\n');
+          try { why = (await r.json()).error || why; } catch (e) { /* plain text */ }
+          this.setState('err', 'ошибка открытия: ' + why);
+          this.term.write('\r\n\x1b[31m[не удалось открыть сессию: ' + why + ']\x1b[0m\r\n');
           return;
         }
         this.sid = (await r.json()).session_id;
         this.setState('wait', 'ожидание агента…');
+        // An agent from before SSH terminals does not answer the request.
+        if (this.ssh) setTimeout(() => {
+          if (!this.closed && !this.ended && this.text === 'ожидание агента…') {
+            this.setState('err', 'агент не начал SSH-подключение');
+            this.term.write('\x1b[33mАгент не ответил. Если он старой версии, обновите его - SSH-терминал появился в новой.\x1b[0m\r\n');
+          }
+        }, 20000);
         this.fit();
         // A WebSocket if it connects; the long polls otherwise, and from a
         // dropped WebSocket on for the rest of this session.
@@ -109,14 +128,22 @@
     take(j) {
       if (j.closed) { this.finish('[сессия завершена]'); return false; }
       for (const f of j.frames || []) {
+        if (f.status) this.sshStatus(f.status, f.note || '');
         if (f.exit) { this.finish('[сессия завершена]'); return false; }
         if (f.data) {
-          if (!this.connected) { this.connected = true; this.setState('ok', 'подключено'); }
+          if (!this.connected && !this.ssh) { this.connected = true; this.setState('ok', 'подключено'); }
           this.term.write(b64ToBytes(f.data));
         }
       }
       return true;
     }
+    // sshStatus shows how the agent's SSH connection goes.
+    sshStatus(st, note) {
+      if (st === 'dial') this.setState('wait', 'SSH: ' + note + '…');
+      else if (st === 'auth') this.setState('wait', 'SSH: ' + note + '…');
+      else if (st === 'ok') { this.connected = true; this.setState('ok', 'SSH: ' + note); }
+      else if (st === 'err') this.setState('err', 'SSH: ' + note);
+    }
     async poll() {
       while (!this.closed && this.sid) {
         let r;
@@ -130,7 +157,7 @@
     finish(msg) {
       if (this.ended) return;
       this.ended = true;
-      this.setState('off', 'соединение закрыто');
+      if (this.state !== 'err') this.setState('off', 'соединение закрыто');
       this.term.write('\r\n\x1b[33m' + msg + '\x1b[0m\r\n');
     }
     // Input goes out one request at a time, so on a slow link a keystroke can
@@ -183,6 +210,11 @@
     }
   }
 
+  // who is what a shell is signed in as, for titles.
+  function who(s) {
+    return s.ssh ? s.ssh.user + '@' + s.ssh.host + (s.ssh.port && s.ssh.port !== 22 ? ':' + s.ssh.port : '') : s.agent.user + '@' + s.agent.host;
+  }
+
   // ---------- tabs ----------
   const tabs = [];
   let active = null, activePane = null;
@@ -212,8 +244,8 @@
   }
   function tabTitle(t) {
     if (t.title) return t.title;
-    const a = t.panes[0].agent;
+    const s = t.panes[0], name = s.ssh ? s.ssh.host : s.agent.name;
-    return t.panes.length > 1 ? a.name + ' +' + (t.panes.length - 1) : a.name;
+    return t.panes.length > 1 ? name + ' +' + (t.panes.length - 1) : name;
   }
   // Tab widths: as wide as the title wants, from a comfortable minimum up to
   // a maximum; when they do not fit, all give way evenly down to a floor,
@@ -224,7 +256,7 @@
   function fitTabs() {
     ruler.font = W.font + 'px ' + getComputedStyle(document.body).fontFamily;
     const live = tabs;
-    const want = live.map(t => Math.min(W.max, Math.max(W.base, Math.ceil(ruler.measureText(tabTitle(t)).width) + CHROME)));
+    const want = live.map(t => Math.min(W.max, Math.max(W.base, Math.ceil(ruler.measureText(tabTitle(t)).width) + CHROME + (t.panes.some(p => p.ssh) ? 46 : 0))));
     const strip = $('tabs');
     const room = strip.clientWidth - parseFloat(getComputedStyle(strip).paddingLeft) * 2 - addBtn.offsetWidth - 4 * (live.length + 1);
     let cap = W.max;
@@ -243,8 +275,13 @@
 
   function renderTab(t) {
     t.el.querySelector('.tab-title').textContent = tabTitle(t);
+    const ssh = t.panes.some(s => s.ssh);
+    if (ssh !== !!t.el.querySelector('.badge-ssh')) {
+      if (ssh) t.el.querySelector('.dot').insertAdjacentHTML('afterend', '<span class="badge-ssh">SSH</span>');
+      else t.el.querySelector('.badge-ssh').remove();
+    }
     requestAnimationFrame(fitTabs);
-    t.el.title = t.panes.map(s => s.agent.user + '@' + s.agent.host).join(', ');
+    t.el.title = t.panes.map(who).join(', ');
     // The tab's dot: red if any shell failed, amber while one connects.
     const st = t.panes.map(s => s.state);
     t.el.querySelector('.dot').className = 'dot ' + (st.includes('err') ? 'err' : st.includes('wait') ? 'wait' : st.includes('ok') ? 'ok' : 'off');
@@ -270,6 +307,7 @@
   function showStatus() {
     if (!activePane) { statusEl.textContent = ''; return; }
     statusEl.textContent = activePane.text;
+    statusEl.title = activePane.text;
     statusEl.className = activePane.state === 'ok' ? 'st-ok' : activePane.state === 'err' ? 'st-err' : 'muted';
   }
   // One tab: a plain terminal, the strip folded into the corner "+".
@@ -279,9 +317,9 @@
     document.body.classList.toggle('multi', multi);
     setTimeout(() => active && layout(active, false), 280);
   }
-  function openTerminal(agent) {
+  function openTerminal(agent, ssh) {
     $('empty').hidden = true;
-    const t = makeTab([new Session(agent)]);
+    const t = makeTab([new Session(agent, ssh)]);
     activate(t);
   }
   function closeTab(t) {
@@ -590,6 +628,8 @@
     const esc = s => String(s).replace(/[&<>"]/g, c => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;' }[c]));
     item('<span class="ico">+</span><span><b>Новый терминал здесь</b><small>' + esc(here.name) + ' · ' + esc(here.user + '@' + here.host) + '</small></span>',
       () => { closeMenu(); openTerminal(here); });
+    item('<span class="ico">' + KEYI + '</span><span><b>SSH-подключение</b><small>агент откроет SSH к другому хосту</small></span>',
+      () => { closeMenu(); openSSH(here); });
     const other = item('<span class="ico">⇄</span><span><b>На другой машине</b><small>выбрать из списка</small></span><span class="chev">›</span>', () => {
       other.remove();
       const list = document.createElement('div');
@@ -633,6 +673,114 @@
   $('emptyadd').onclick = ev => openMenu(ev.currentTarget);
   document.addEventListener('keydown', ev => { if (ev.key === 'Escape' && !addMenu.hidden) closeMenu(); });
 
+  // ---------- the SSH dialog ----------
+  const KEYI = '<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="7.5" cy="15.5" r="4.5"/><path d="m21 2-9.6 9.6M15.5 7.5l3 3L22 7l-3-3"/></svg>';
+  let sshDlg = null;
+  function openSSH(here) {
+    if (!sshDlg) sshDlg = makeSSHDialog();
+    sshDlg.show(here);
+  }
+  function makeSSHDialog() {
+    const d = document.createElement('dialog');
+    d.className = 'sshdlg';
+    d.innerHTML =
+      '<form method="dialog" autocomplete="off">' +
+      '<div class="dlg-h"><span class="ico">' + KEYI + '</span><strong style="flex:1">SSH-подключение</strong>' +
+      '<button type="button" class="btn ghost small icon close x" data-close aria-label="Закрыть">' + X + '</button></div>' +
+      '<div class="dlg-b">' +
+      '<label class="f"><span>Подключаться с машины</span><select name="agent"></select></label>' +
+      '<div class="frow"><label class="f grow"><span>Хост</span><input type="text" name="host" placeholder="example.com или 10.0.0.5" required autocapitalize="off" spellcheck="false"></label>' +
+      '<label class="f port"><span>Порт</span><input type="number" name="port" min="1" max="65535" value="22" required></label></div>' +
+      '<label class="f"><span>Пользователь</span><input type="text" name="user" placeholder="root" required autocapitalize="off" spellcheck="false"></label>' +
+      '<div class="f"><span>Вход</span><div class="seg" role="tablist">' +
+      '<button type="button" data-auth="password" class="on">Пароль</button><button type="button" data-auth="key">Ключ</button><button type="button" data-auth="agent">Ключи агента</button></div></div>' +
+      '<div class="auth" data-for="password"><input type="password" name="password" placeholder="пароль" autocomplete="off"></div>' +
+      '<div class="auth" data-for="key" hidden>' +
+      '<textarea name="key" rows="5" spellcheck="false" placeholder="-----BEGIN OPENSSH PRIVATE KEY-----&#10;…вставьте ключ или загрузите файл"></textarea>' +
+      '<div class="frow"><button type="button" class="btn ghost small" data-load>Загрузить файл…</button><span class="muted keyname"></span>' +
+      '<input type="file" hidden></div>' +
+      '<input type="password" name="passphrase" placeholder="фраза ключа, если есть" autocomplete="off"></div>' +
+      '<p class="auth muted" data-for="agent" hidden>Агент войдёт своими ключами из ~/.ssh (id_ed25519, id_ecdsa, id_rsa) без фразы.</p>' +
+      '<p class="sshmsg"></p>' +
+      '<div class="row end"><button type="button" class="btn ghost" data-close>Отмена</button><button type="submit">Подключиться</button></div>' +
+      '</div></form>';
+    document.body.appendChild(d);
+    const f = d.querySelector('form'), msg = d.querySelector('.sshmsg');
+    let auth = 'password';
+    const setAuth = a => {
+      auth = a;
+      d.querySelectorAll('.seg button').forEach(b => b.classList.toggle('on', b.dataset.auth === a));
+      d.querySelectorAll('.auth').forEach(el => { el.hidden = el.dataset.for !== a; });
+    };
+    d.querySelectorAll('.seg button').forEach(b => { b.onclick = () => setAuth(b.dataset.auth); });
+    d.querySelectorAll('[data-close]').forEach(b => { b.onclick = () => close(); });
+    const file = d.querySelector('input[type=file]');
+    d.querySelector('[data-load]').onclick = () => file.click();
+    file.onchange = () => {
+      const fl = file.files[0];
+      if (!fl) return;
+      if (fl.size > 32768) { msg.textContent = 'файл великоват для ключа'; return; }
+      fl.text().then(t => { f.key.value = t.trim() + '\n'; d.querySelector('.keyname').textContent = fl.name; msg.textContent = ''; });
+      file.value = '';
+    };
+    // then runs once the dialog is shut and focus is back where it was, so
+    // what it focuses stays focused.
+    function close(then) {
+      d.classList.add('closing');
+      setTimeout(() => { d.classList.remove('closing'); d.close(); if (then) then(); }, 160);
+    }
+    d.addEventListener('cancel', ev => { ev.preventDefault(); close(); });
+    d.addEventListener('click', ev => { if (ev.target === d) close(); });
+    let agents = [];
+    f.onsubmit = ev => {
+      ev.preventDefault();
+      const a = agents.find(x => x.id === f.agent.value);
+      if (!a) { msg.textContent = 'выберите машину'; return; }
+      const t = { host: f.host.value.trim(), port: Number(f.port.value) || 22, user: f.user.value.trim() };
+      if (auth === 'password') {
+        if (!f.password.value) { msg.textContent = 'введите пароль'; f.password.focus(); return; }
+        t.password = f.password.value;
+      } else if (auth === 'key') {
+        if (!/PRIVATE KEY/.test(f.key.value)) { msg.textContent = 'вставьте закрытый ключ или загрузите файл'; return; }
+        t.key = f.key.value;
+        if (f.passphrase.value) t.passphrase = f.passphrase.value;
+      }
+      try { localStorage.setItem('lpra.ssh.last', JSON.stringify({ agent: a.id, host: t.host, port: t.port, user: t.user, auth: auth })); } catch (e) { /* not kept */ }
+      f.password.value = ''; f.passphrase.value = ''; f.key.value = '';
+      d.querySelector('.keyname').textContent = '';
+      close(() => openTerminal(a, t));
+    };
+    return {
+      show(here) {
+        msg.textContent = '';
+        let last = {};
+        try { last = JSON.parse(localStorage.getItem('lpra.ssh.last') || '{}'); } catch (e) { /* none */ }
+        agents = [here];
+        const fill = () => {
+          f.agent.innerHTML = '';
+          agents.forEach(a => {
+            const o = document.createElement('option');
+            o.value = a.id; o.textContent = a.name + ' · ' + a.user + '@' + a.host + (a.online === false ? ' (не в сети)' : '');
+            o.disabled = a.online === false;
+            f.agent.appendChild(o);
+          });
+          f.agent.value = agents.some(a => a.id === last.agent && a.online !== false) ? last.agent : here.id;
+        };
+        fill();
+        fetch('/api/panel/agents/presence', { cache: 'no-store' }).then(r => r.json()).then(all => {
+          agents = all.map(a => ({ id: a.id, name: a.name, host: a.hostname, user: a.user, online: a.online }));
+          if (!agents.some(a => a.id === here.id)) agents.unshift(here);
+          fill();
+        }).catch(() => {});
+        if (last.host) { f.host.value = last.host; f.port.value = last.port || 22; f.user.value = last.user || ''; }
+        setAuth(last.auth === 'key' || last.auth === 'agent' ? last.auth : 'password');
+        d.showModal();
+        // On a phone the keyboard waits for a tap.
+        if (desk) (last.host ? (last.auth === 'password' || !last.auth ? f.password : f.host) : f.host).focus();
+      }
+    };
+  }
+
   // ---------- page ----------
   function refit() {
     if (touch && window.visualViewport) {

internal/server/web/templates/terminal.html

@@ -10,6 +10,42 @@
 <style>
   #status.st-ok  { color:#37c871; }
   #status.st-err { color:#ff5c5c; }
+  #status { display:inline-block; vertical-align:bottom; min-width:0; max-width:42vw; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
+  /* SSH: the badge on a pane, and the dialog to connect. */
+  .badge-ssh { flex:none; font-size:10px; font-weight:600; letter-spacing:.04em; padding:1px 5px; border-radius:4px;
+               background:#12202f; color:var(--accent); border:1px solid #1f3a57; }
+  dialog.sshdlg { max-width:460px; }
+  dialog.sshdlg[open] { animation:dlg-in .2s ease; }
+  dialog.sshdlg[open]::backdrop { animation:dlg-fade .2s ease; }
+  dialog.sshdlg.closing { animation:dlg-out .16s ease forwards; }
+  dialog.sshdlg.closing::backdrop { animation:dlg-fade .16s ease reverse forwards; }
+  @keyframes dlg-in { from { opacity:0; transform:translateY(10px) scale(.97); } }
+  @keyframes dlg-out { to { opacity:0; transform:translateY(6px) scale(.98); } }
+  @keyframes dlg-fade { from { opacity:0; } }
+  .sshdlg .dlg-h .ico { color:var(--accent); display:inline-flex; }
+  .sshdlg .dlg-b { display:grid; gap:12px; }
+  .sshdlg .f { display:grid; gap:5px; margin:0; }
+  .sshdlg .f > span { font-size:12px; color:var(--muted); }
+  .sshdlg .frow { display:flex; gap:10px; align-items:end; }
+  .sshdlg .frow .grow { flex:1; min-width:0; }
+  .sshdlg .frow .port { width:92px; flex:none; }
+  .sshdlg input, .sshdlg select, .sshdlg textarea { width:100%; box-sizing:border-box; }
+  .sshdlg textarea { font:12px/1.4 ui-monospace, SFMono-Regular, Menlo, monospace; resize:vertical; min-height:90px;
+                     background:var(--bg, #0c0f13); color:var(--text); border:1px solid var(--border); border-radius:8px; padding:8px 10px; }
+  .sshdlg textarea:focus { border-color:var(--accent); outline:none; }
+  .sshdlg .auth { display:grid; gap:8px; animation:auth-in .18s ease; }
+  .sshdlg .auth[hidden] { display:none; }
+  @keyframes auth-in { from { opacity:0; transform:translateY(-4px); } }
+  .sshdlg p.auth { margin:0; font-size:13px; }
+  .sshdlg .keyname { font-size:12px; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; align-self:center; }
+  .sshdlg .seg { display:flex; padding:3px; gap:3px; background:#0c0f13; border:1px solid var(--border); border-radius:9px; }
+  .sshdlg .seg button { flex:1; padding:6px 8px; font-size:13px; background:transparent; color:var(--muted); border:0; border-radius:6px;
+                        transition:background .18s, color .18s; }
+  .sshdlg .seg button:hover { color:var(--text); }
+  .sshdlg .seg button.on { background:#12202f; color:var(--text); box-shadow:inset 0 0 0 1px #1f3a57; }
+  .sshdlg .sshmsg { margin:0; min-height:18px; font-size:13px; color:var(--danger); }
+  .sshdlg .row.end { display:flex; justify-content:flex-end; gap:8px; }
+  @media (max-width:520px) { .sshdlg .seg button { font-size:12px; padding:6px 4px; } }
   /* The page is the terminal: bar, tabs, then the terminals to the bottom. */
   body { height:100vh; display:flex; flex-direction:column; overflow:hidden; }
   header.topbar { flex:none; }
@@ -40,7 +76,7 @@
              pointer-events:none; transition:left .12s ease; }
   .tabmark[hidden] { display:none; }
   .dot { width:7px; height:7px; border-radius:50%; background:#555d6a; flex:none; transition:background .3s; }
-  .dot.ok { background:var(--ok); } .dot.err { background:var(--danger); } .dot.wait { background:#e6a23c; }
+  .dot.ok { background:var(--ok); } .dot.err { background:var(--danger); padding:0; border:0; margin:0; } .dot.wait { background:#e6a23c; }
   /* The terminals' area. */
   .area { position:relative; flex:1; min-height:0; margin:12px 16px 16px; border:1px solid var(--border); border-radius:10px; background:#0c0f13; overflow:hidden; }
   body.multi .area { margin-top:0; border-top-left-radius:0; }