tor: premium tor-url / tor-irc / tor routes over Tor

cmd/agentbbs/main.go

@@ -60,6 +60,7 @@ import (
 	"github.com/profullstack/agentbbs/internal/sandbox"
 	"github.com/profullstack/agentbbs/internal/sites"
 	"github.com/profullstack/agentbbs/internal/store"
+	"github.com/profullstack/agentbbs/internal/tor"
 	"github.com/profullstack/agentbbs/plugins/about"
 	"github.com/profullstack/agentbbs/plugins/agentgames"
 	"github.com/profullstack/agentbbs/plugins/arcade"
@@ -246,6 +247,12 @@ func (a *app) router() wish.Middleware {
 				a.handleGame(s)
 			case auth.IsPodName(user):
 				a.handlePod(s)
+			case auth.IsTorURLName(user):
+				a.handleTorURL(s)
+			case auth.IsTorIRCName(user):
+				a.handleTorIRC(s)
+			case auth.IsTorName(user):
+				a.handleTorCmd(s)
 			case isVideo:
 				a.handleVideo(s, code)
 			case user == "agent":
@@ -805,6 +812,136 @@ func (a *app) handlePod(s ssh.Session) {
 	}
 }
 
+// torMember resolves the caller's key to a premium member for the tor routes,
+// printing a reason and returning ok=false otherwise. It records the session.
+func (a *app) torMember(s ssh.Session, route string) (store.User, bool) {
+	fp := auth.Fingerprint(s.PublicKey())
+	if fp == "" {
+		wish.Println(s, route+"@ needs your registered SSH key. New here? ssh join@"+a.host)
+		_ = s.Exit(1)
+		return store.User{}, false
+	}
+	u, found, err := a.st.UserByFingerprint(fp)
+	if err != nil || !found {
+		wish.Println(s, "key not registered — run: ssh join@"+a.host)
+		_ = s.Exit(1)
+		return store.User{}, false
+	}
+	if u.Banned {
+		wish.Println(s, "this account is suspended.")
+		_ = s.Exit(1)
+		return store.User{}, false
+	}
+	if !a.ensurePremium(&u) {
+		wish.Println(s, "  "+route+" is a Premium feature ($10 lifetime). Upgrade: ssh join@"+a.host)
+		_ = s.Exit(1)
+		return store.User{}, false
+	}
+	_, _ = a.st.RecordSession(u.ID, s.User(), remoteIP(s), route)
+	return u, true
+}
+
+// handleTorURL fetches a single URL over Tor and writes the body back. One-shot,
+// host-side, and constrained (timeout + size cap, http/https only). Premium.
+func (a *app) handleTorURL(s ssh.Session) {
+	u, ok := a.torMember(s, "tor-url")
+	if !ok {
+		return
+	}
+	args := s.Command()
+	if len(args) == 0 {
+		wish.Println(s, "usage: ssh tor-url@"+a.host+" <http(s)-url>   (e.g. an .onion address)")
+		_ = s.Exit(1)
+		return
+	}
+	url := args[0]
+	log.Info("tor-url fetch", "user", u.Name, "url", url)
+	body, err := tor.FetchURL(s.Context(), url)
+	if err != nil {
+		wish.Println(s, "  "+err.Error())
+		_ = s.Exit(1)
+		return
+	}
+	_, _ = s.Write(body)
+	_ = s.Exit(0)
+}
+
+// handleTorIRC opens an interactive IRC-over-Tor session inside the member's
+// pod (sandboxed). Premium; requires a PTY.
+func (a *app) handleTorIRC(s ssh.Session) {
+	u, ok := a.torMember(s, "tor-irc")
+	if !ok {
+		return
+	}
+	args := s.Command()
+	if len(args) == 0 || !validIRCServer(args[0]) {
+		wish.Println(s, "usage: ssh -t tor-irc@"+a.host+" <server[:port]>   (e.g. an .onion IRC server)")
+		_ = s.Exit(1)
+		return
+	}
+	if a.pods == nil {
+		wish.Println(s, "pods are temporarily unavailable on this host.")
+		_ = s.Exit(1)
+		return
+	}
+	log.Info("tor-irc connect", "user", u.Name, "server", args[0])
+	if err := a.pods.Exec(s, u.Name, tor.IRCArgv(args[0])); err != nil {
+		wish.Println(s, "tor-irc error: "+err.Error())
+		_ = s.Exit(1)
+	}
+}
+
+// handleTorCmd runs an arbitrary command through Tor (torsocks) inside the
+// member's pod, never on the host. Premium; requires a PTY.
+func (a *app) handleTorCmd(s ssh.Session) {
+	u, ok := a.torMember(s, "tor")
+	if !ok {
+		return
+	}
+	args := s.Command()
+	if len(args) == 0 {
+		wish.Println(s, "usage: ssh -t tor@"+a.host+" <command...>   (runs in your pod, over Tor)")
+		_ = s.Exit(1)
+		return
+	}
+	if a.pods == nil {
+		wish.Println(s, "pods are temporarily unavailable on this host.")
+		_ = s.Exit(1)
+		return
+	}
+	log.Info("tor cmd", "user", u.Name, "argv", strings.Join(args, " "))
+	if err := a.pods.Exec(s, u.Name, tor.Torsocks(args)); err != nil {
+		wish.Println(s, "tor error: "+err.Error())
+		_ = s.Exit(1)
+	}
+}
+
+// validIRCServer accepts host or host:port with a sane charset (no shell/space).
+func validIRCServer(s string) bool {
+	host := s
+	if i := strings.LastIndex(s, ":"); i > 0 {
+		port := s[i+1:]
+		host = s[:i]
+		if port == "" || len(port) > 5 {
+			return false
+		}
+		for _, r := range port {
+			if r < '0' || r > '9' {
+				return false
+			}
+		}
+	}
+	if host == "" || len(host) > 255 {
+		return false
+	}
+	for _, r := range host {
+		if !(r >= 'a' && r <= 'z' || r >= 'A' && r <= 'Z' || r >= '0' && r <= '9' || r == '.' || r == '-') {
+			return false
+		}
+	}
+	return true
+}
+
 // handleVideo joins a PairUX call rendered as ASCII (docs/video.md).
 // `video@` prompts for a code; `video-<code>@` joins directly. Codes are
 // minted by PairUX — starting a call requires already having one.

internal/auth/auth.go

@@ -46,6 +46,16 @@ var DomainNames = map[string]bool{"domain": true, "domains": true}
 // (see IsAdmin); the name itself confers nothing.
 var AdminNames = map[string]bool{"admin": true, "sysop": true}
 
+// TorURLNames route to the one-shot "fetch a URL over Tor" command (premium).
+var TorURLNames = map[string]bool{"tor-url": true}
+
+// TorIRCNames route to an interactive IRC-over-Tor client in the member's pod.
+var TorIRCNames = map[string]bool{"tor-irc": true}
+
+// TorNames route to the generic "run a command over Tor" passthrough in the
+// member's pod (premium). Checked after the more specific tor-* routes.
+var TorNames = map[string]bool{"tor": true}
+
 // GameNames are usernames that route to AgentGames: the line-delimited-JSON
 // agent-vs-agent match protocol (PRD §5.2). `play@` stays a guest hub alias.
 var GameNames = map[string]bool{"game": true, "games": true}
@@ -65,6 +75,15 @@ func IsDomainName(u string) bool { return DomainNames[strings.ToLower(u)] }
 // IsAdminName reports whether the SSH username requests the admin console.
 func IsAdminName(u string) bool { return AdminNames[strings.ToLower(u)] }
 
+// IsTorURLName reports whether the SSH username requests the tor-url fetch.
+func IsTorURLName(u string) bool { return TorURLNames[strings.ToLower(u)] }
+
+// IsTorIRCName reports whether the SSH username requests the tor-irc client.
+func IsTorIRCName(u string) bool { return TorIRCNames[strings.ToLower(u)] }
+
+// IsTorName reports whether the SSH username requests the generic tor passthrough.
+func IsTorName(u string) bool { return TorNames[strings.ToLower(u)] }
+
 // systemReserved are names that don't drive an SSH route but would still
 // collide with a per-user subdomain (<name>.<host>), the agent route, or common
 // infra hostnames — so members may not claim them as account names.
@@ -80,7 +99,8 @@ var systemReserved = map[string]bool{
 // therefore cannot be used as a member's account name.
 func IsReservedName(name string) bool {
 	n := strings.ToLower(name)
-	if GuestNames[n] || PodNames[n] || JoinNames[n] || DomainNames[n] || AdminNames[n] || systemReserved[n] {
+	if GuestNames[n] || PodNames[n] || JoinNames[n] || DomainNames[n] || AdminNames[n] ||
+		TorURLNames[n] || TorIRCNames[n] || TorNames[n] || systemReserved[n] {
 		return true
 	}
 	return strings.HasPrefix(n, "video-") // video-<code> call routes

internal/pods/pods.go

@@ -144,6 +144,47 @@ func (m *Manager) Attach(s ssh.Session, user string) error {
 	return nil
 }
 
+// Exec provisions the user's pod and runs argv inside it wired to the SSH
+// session (PTY required). Used for tor@/tor-irc@ so arbitrary or interactive
+// commands run sandboxed in the member's container, never on the host. Blocks
+// until the command exits or the session closes.
+func (m *Manager) Exec(s ssh.Session, user string, argv []string) error {
+	if len(argv) == 0 {
+		return fmt.Errorf("pods: no command given")
+	}
+	ptyReq, winCh, hasPty := s.Pty()
+	if !hasPty {
+		return fmt.Errorf("pods: a PTY is required (ssh -t)")
+	}
+	name, err := m.ensure(user)
+	if err != nil {
+		return err
+	}
+
+	args := append([]string{"exec", "-it", "-e", "TERM=" + ptyReq.Term, name}, argv...)
+	cmd := exec.Command(m.engine, args...)
+	f, err := pty.Start(cmd)
+	if err != nil {
+		return fmt.Errorf("pods: exec failed: %w", err)
+	}
+	defer f.Close()
+
+	m.ref(name, +1)
+	defer m.deref(name)
+
+	_ = pty.Setsize(f, &pty.Winsize{Rows: uint16(ptyReq.Window.Height), Cols: uint16(ptyReq.Window.Width)})
+	go func() {
+		for w := range winCh {
+			_ = pty.Setsize(f, &pty.Winsize{Rows: uint16(w.Height), Cols: uint16(w.Width)})
+		}
+	}()
+
+	go func() { _, _ = io.Copy(f, s) }() // ssh -> pod
+	_, _ = io.Copy(s, f)                 // pod -> ssh
+	_ = cmd.Wait()
+	return nil
+}
+
 func (m *Manager) ref(name string, d int) {
 	m.mu.Lock()
 	defer m.mu.Unlock()

internal/tor/tor.go

@@ -0,0 +1,80 @@
+// Package tor fetches URLs and wraps commands so they egress through the host's
+// Tor SOCKS proxy. tor-url fetches run on the host (constrained); generic and
+// IRC commands run inside the member's pod via torsocks (see cmd/agentbbs).
+package tor
+
+import (
+	"context"
+	"fmt"
+	"net/url"
+	"os"
+	"os/exec"
+	"strings"
+	"time"
+)
+
+// SocksAddr is the host-local Tor SOCKS5 endpoint that setup.sh's tor service
+// listens on. Overridable so a dev host can point elsewhere.
+var SocksAddr = envOr("AGENTBBS_TOR_SOCKS", "127.0.0.1:9050")
+
+// Fetch limits so a single member can't tie up the host.
+const (
+	fetchTimeout = 30 * time.Second
+	maxBytes     = 2_000_000 // 2 MB
+)
+
+// FetchURL retrieves rawURL over Tor and returns the body (capped at maxBytes).
+// Only http/https are allowed and the call is bounded by a timeout, so the URL
+// (passed to curl as a single argv element — never a shell) can't be abused to
+// reach the local network or run unboundedly.
+func FetchURL(ctx context.Context, rawURL string) ([]byte, error) {
+	u, err := url.Parse(strings.TrimSpace(rawURL))
+	if err != nil || (u.Scheme != "http" && u.Scheme != "https") || u.Host == "" {
+		return nil, fmt.Errorf("give an http(s) URL, e.g. http://example.onion")
+	}
+	ctx, cancel := context.WithTimeout(ctx, fetchTimeout)
+	defer cancel()
+	cmd := exec.CommandContext(ctx, "curl",
+		"-sS", "-L", "--max-redirs", "3",
+		"--max-time", fmt.Sprint(int(fetchTimeout.Seconds())),
+		"--max-filesize", fmt.Sprint(maxBytes),
+		"--proto", "=http,https",
+		"--socks5-hostname", SocksAddr, // resolve the hostname through Tor too
+		u.String(),
+	)
+	out, err := cmd.Output()
+	if err != nil {
+		if ctx.Err() == context.DeadlineExceeded {
+			return nil, fmt.Errorf("timed out after %s", fetchTimeout)
+		}
+		return nil, fmt.Errorf("fetch failed (is the host reachable over Tor?): %v", err)
+	}
+	if len(out) > maxBytes {
+		out = out[:maxBytes]
+	}
+	return out, nil
+}
+
+// Torsocks prefixes argv with torsocks so the command's network traffic is
+// routed through Tor when run inside a pod that has torsocks configured.
+func Torsocks(argv []string) []string {
+	return append([]string{"torsocks"}, argv...)
+}
+
+// IRCArgv builds the argv for an interactive IRC-over-Tor session to server
+// (host[:port]); it runs irssi through torsocks. server is validated by the
+// caller. Defaults to the standard IRC port when none is given.
+func IRCArgv(server string) []string {
+	host, port := server, "6667"
+	if i := strings.LastIndex(server, ":"); i > 0 {
+		host, port = server[:i], server[i+1:]
+	}
+	return Torsocks([]string{"irssi", "--connect=" + host, "--port=" + port})
+}
+
+func envOr(k, def string) string {
+	if v := strings.TrimSpace(os.Getenv(k)); v != "" {
+		return v
+	}
+	return def
+}

setup.sh

@@ -87,8 +87,14 @@ apt-get update -qq
 apt-get install -y -qq \
   git ca-certificates curl ufw ffmpeg unzip \
   podman uidmap slirp4netns fuse-overlayfs \
+  tor torsocks \
   debian-keyring debian-archive-keyring apt-transport-https >/dev/null
 
+# Tor SOCKS proxy for the tor-url@/tor@/tor-irc@ routes. Ships listening on
+# 127.0.0.1:9050 by default; keep it loopback-only (never expose it).
+log "enabling tor (SOCKS 127.0.0.1:9050)"
+systemctl enable --now tor >/dev/null 2>&1 || warn "tor service not enabled — tor-url@ will be unavailable"
+
 # yt-dlp from pip is fresher than apt; fall back to apt if pip is unavailable.
 if ! command -v yt-dlp >/dev/null; then
   log "installing yt-dlp"