OCSB_DISPLAY: agent windows on the desktop through the Wayland socket

Off by default. With OCSB_DISPLAY=1 the sandbox gets only the Wayland socket and /dev/dri: the agent's windows (e.g. a Playwright browser) appear on the desktop, but a Wayland client cannot read other windows or inject input into them. X11 and the X cookie are never passed in.

README.md

@@ -124,6 +124,7 @@ files are read, so you can use it in values. Relative paths are relative to the
 | `OCSB_PLUGINS` | skill-compact-resurrect | plugin files from `plugins/` (or absolute paths) |
 | `OCSB_PANEL` | `1` | "Tokens" panel in the web UI |
 | `OCSB_NOTIFICATIONS` | `1` | desktop notifications through a filtered D-Bus proxy |
+| `OCSB_DISPLAY` | `0` | `1`: the agent's windows (e.g. a Playwright browser) on your desktop through the Wayland socket |
 | `OCSB_TMP` | `private` | `private`: the agent's own `/tmp` in the state directory; `shared`: the host's `/tmp` |
 | `OCSB_SANDBOX` | `1` | `0` = filter and netlock only, no bubblewrap |
 | `OCSB_WORKTREES_DIR` | `../<project>-worktrees` | where worktrees go |
@@ -243,9 +244,11 @@ Inside the sandbox:
 - **Session bus:** replaced by `xdg-dbus-proxy` that talks only to
   `org.freedesktop.Notifications`; the real bus would let the agent start processes outside
   the sandbox with `systemd-run --user`.
-- **No display:** `DISPLAY`, `WAYLAND_DISPLAY` and `XAUTHORITY` are empty and the X cookie is
+- **Display:** by default none — `DISPLAY`, `WAYLAND_DISPLAY` and `XAUTHORITY` are empty and the
-  hidden, so GUI programs cannot reach your desktop; run browsers (Playwright MCP, Chrome)
+  X cookie is hidden; run browsers headless. With `OCSB_DISPLAY=1` the agent gets only the
-  headless. `xdg-open` is disabled; the UI is opened by `run` from your normal session.
+  Wayland socket (and `/dev/dri` for the GPU): its windows appear on your desktop, but unlike
+  X11 a Wayland client cannot read other windows or inject input into them. X11 is never
+  passed in. `xdg-open` is disabled; the UI is opened by `run` from your normal session.
 - **No silent fallback:** with `OCSB_SANDBOX=1` and no working bubblewrap, `run` refuses to
   start.
 
@@ -267,6 +270,8 @@ place, requests to production — not to hold a determined attacker.
 - **The project is writable.** Mistakes inside it are real; cc-safety-net blocks the common
   destructive commands, git keeps history — commit often.
 - With `OCSB_TMP=shared` the host's `/tmp` and its sockets are reachable.
+- With `OCSB_DISPLAY=1` the agent can open windows on your desktop and use the clipboard while
+  its window is focused.
 
 ## Troubleshooting
 
@@ -281,7 +286,7 @@ place, requests to production — not to hold a determined attacker.
 | `bubblewrap cannot create a sandbox` | unprivileged user namespaces are disabled (`kernel.unprivileged_userns_clone`, AppArmor userns restrictions) |
 | no "Tokens" panel | open port 4196, not 4197; see `<state>/data/opencode/log/context-panel.log` |
 | no notifications | install `xdg-dbus-proxy` |
-| browser tools fail (`Missing X server`, `Failed to connect to Wayland display`) | no display in the sandbox: run the browser headless (Playwright MCP: `--headless`) |
+| browser tools fail (`Missing X server`, `Failed to connect to Wayland display`) | no display in the sandbox: set `OCSB_DISPLAY=1` (Wayland session) or run the browser headless (Playwright MCP: `--headless`) |
 | can't find a file the agent put in `/tmp` | it is in `~/.local/share/opencode-sandbox/<name>/tmp` |
 | `docker build` fails pulling images | the proxy reaches registries through squid: check `egress logs` |
 

README.ru.md

@@ -123,6 +123,7 @@ squid.conf.
 | `OCSB_PLUGINS` | skill-compact-resurrect | файлы плагинов из `plugins/` (или абсолютные пути) |
 | `OCSB_PANEL` | `1` | панель «Токены» в веб-интерфейсе |
 | `OCSB_NOTIFICATIONS` | `1` | уведомления через фильтрующий прокси D-Bus |
+| `OCSB_DISPLAY` | `0` | `1` — окна агента (например, браузер Playwright) на вашем экране через сокет Wayland |
 | `OCSB_TMP` | `private` | `private` — свой `/tmp` агента в каталоге состояния; `shared` — `/tmp` хоста |
 | `OCSB_SANDBOX` | `1` | `0` — только фильтр и netlock, без bubblewrap |
 | `OCSB_WORKTREES_DIR` | `../<проект>-worktrees` | куда класть worktree |
@@ -244,9 +245,10 @@ opencode-sandbox run
 - **Сессионная шина:** заменена на `xdg-dbus-proxy`, который пропускает только
   `org.freedesktop.Notifications`; настоящая шина позволила бы агенту запускать процессы вне
   песочницы через `systemd-run --user`.
-- **Нет экрана:** `DISPLAY`, `WAYLAND_DISPLAY` и `XAUTHORITY` пустые, cookie X скрыт — графические
+- **Экран:** по умолчанию нет — `DISPLAY`, `WAYLAND_DISPLAY` и `XAUTHORITY` пустые, cookie X
-  программы до вашего рабочего стола не доберутся; браузеры (Playwright MCP, Chrome) — только
+  скрыт; браузеры — headless. С `OCSB_DISPLAY=1` агент получает только сокет Wayland (и
-  headless. `xdg-open` отключён; интерфейс открывает `run` из вашей обычной сессии.
+  `/dev/dri` для видеокарты): его окна появляются на вашем экране, но, в отличие от X11, клиент
+  Wayland не может читать чужие окна и подделывать в них ввод. X11 не пробрасывается никогда. `xdg-open` отключён; интерфейс открывает `run` из вашей обычной сессии.
 - **Без тихого отката:** при `OCSB_SANDBOX=1` и неработающем bubblewrap `run` не запустится.
 
 **Netlock** (`netlock setup`, sudo) создаёт группу `opencode-sandbox`, добавляет в неё вас и
@@ -268,6 +270,8 @@ opencode-sandbox run
 - **Проект доступен на запись.** Ошибки внутри него настоящие; cc-safety-net блокирует
   типичные разрушительные команды, git хранит историю — коммитьте чаще.
 - С `OCSB_TMP=shared` доступны `/tmp` хоста и его сокеты.
+- С `OCSB_DISPLAY=1` агент может открывать окна на вашем экране и пользоваться буфером обмена,
+  пока его окно в фокусе.
 
 ## Решение проблем
 
@@ -282,7 +286,7 @@ opencode-sandbox run
 | `bubblewrap cannot create a sandbox` | отключены непривилегированные user namespaces (`kernel.unprivileged_userns_clone`, ограничения AppArmor) |
 | нет панели «Токены» | открывайте порт 4196, а не 4197; журнал — `<состояние>/data/opencode/log/context-panel.log` |
 | нет уведомлений | установите `xdg-dbus-proxy` |
-| браузерные инструменты падают (`Missing X server`, `Failed to connect to Wayland display`) | в песочнице нет экрана: запускайте браузер headless (Playwright MCP: `--headless`) |
+| браузерные инструменты падают (`Missing X server`, `Failed to connect to Wayland display`) | в песочнице нет экрана: включите `OCSB_DISPLAY=1` (сессия Wayland) или запускайте браузер headless (Playwright MCP: `--headless`) |
 | не найти файл, который агент положил в `/tmp` | он в `~/.local/share/opencode-sandbox/<имя>/tmp` |
 | `docker build` не скачивает образы | реестры доступны через squid: смотрите `egress logs` |
 

lib/common.sh

@@ -19,7 +19,7 @@ ocsb_info() { echo "→ $*"; }
 
 OCSB_SCALARS=(
   OCSB_NAME OCSB_WEB_PORT OCSB_EGRESS_PORT OCSB_NETLOCK_GROUP OCSB_SANDBOX OCSB_PANEL
-  OCSB_NOTIFICATIONS OCSB_TMP OCSB_OPENCODE_BIN OCSB_ENV_FILE OCSB_KUBECONFIG OCSB_PASSWORD_FILE
+  OCSB_NOTIFICATIONS OCSB_TMP OCSB_DISPLAY OCSB_OPENCODE_BIN OCSB_ENV_FILE OCSB_KUBECONFIG OCSB_PASSWORD_FILE
   OCSB_WORKTREES_DIR OCSB_WT_PREFIX OCSB_WT_BASE OCSB_WT_SLUG_REGEX OCSB_DOCKER_GW
   OCSB_STATE_DIR OCSB_OPENCODE_CONFIG OCSB_EGRESS_BASE
 )
@@ -34,6 +34,7 @@ ocsb_defaults() {
   OCSB_PANEL=1                 # "Tokens" panel in the web UI (plugins/context-panel)
   OCSB_NOTIFICATIONS=1         # desktop notifications through a filtered D-Bus proxy
   OCSB_TMP=private             # private: own /tmp in the state dir; shared: the host's /tmp
+  OCSB_DISPLAY=0               # 1: windows on your desktop through the Wayland socket (no X11)
   OCSB_OPENCODE_BIN=""         # default: `opencode` from PATH
   OCSB_ENV_FILE=""             # KEY=VALUE file with tokens, exported to OpenCode
   OCSB_KUBECONFIG=""           # kubeconfig for the agent (~/.kube/config stays hidden)

lib/run.sh

@@ -177,6 +177,11 @@ ocsb_bwrap_args() {
   if [[ -n ${OCSB_DBUS_PROXY_PID:-} && -S $(ocsb_dbus_sock) ]]; then
     OCSB_BWRAP+=(--ro-bind "$(ocsb_dbus_sock)" "/run/user/${uid}/bus")
   fi
+  if [[ ${OCSB_DISPLAY} == 1 && -n ${WAYLAND_DISPLAY:-} && -S ${XDG_RUNTIME_DIR:-/run/user/${uid}}/${WAYLAND_DISPLAY} ]]; then
+    OCSB_BWRAP+=(--ro-bind "${XDG_RUNTIME_DIR:-/run/user/${uid}}/${WAYLAND_DISPLAY}" "/run/user/${uid}/${WAYLAND_DISPLAY}")
+    # GPU for rendering; without it browsers fall back to software
+    [[ -d /dev/dri ]] && OCSB_BWRAP+=(--dev-bind /dev/dri /dev/dri)
+  fi
   OCSB_BWRAP+=(--chdir "${OCSB_PROJECT_DIR}")
 }
 
@@ -255,8 +260,16 @@ ocsb_run() {
     # No permission prompts in the sandbox: permission rules from all configs form one
     # list, the last match wins, and OPENCODE_CONFIG_CONTENT is the last document.
     # Denies are repeated after "*" so they still win.
-    # No display: GUI programs fail fast; browsers must run headless
+    # Display: by default none (GUI programs fail fast, browsers run headless). With
-    env+=("DISPLAY=" "WAYLAND_DISPLAY=" "XAUTHORITY=")
+    # OCSB_DISPLAY=1 only the Wayland socket: unlike X11, a Wayland client cannot read other
+    # windows or inject input into them. X11 (and the X cookie) stays out either way.
+    env+=("DISPLAY=" "XAUTHORITY=")
+    if [[ ${OCSB_DISPLAY} == 1 && -n ${WAYLAND_DISPLAY:-} && -S ${XDG_RUNTIME_DIR:-/run/user/$(id -u)}/${WAYLAND_DISPLAY} ]]; then
+      env+=("WAYLAND_DISPLAY=${WAYLAND_DISPLAY}" "XDG_RUNTIME_DIR=/run/user/$(id -u)")
+    else
+      [[ ${OCSB_DISPLAY} == 1 ]] && ocsb_warn "OCSB_DISPLAY=1 but no Wayland session — no windows in the sandbox"
+      env+=("WAYLAND_DISPLAY=")
+    fi
     env+=('OPENCODE_CONFIG_CONTENT={"permission":{"bash":{"*":"allow","systemd-run *":"deny","sudo *":"deny"},"external_directory":{"*":"allow"}}}')
     echo "  sandbox: writable ${OCSB_PROJECT_DIR}, ${OCSB_WORKTREES_DIR}${OCSB_RW[*]:+, ${OCSB_RW[*]}}; the rest of the system is read-only"
   fi

skills/opencode-sandbox/SKILL.md

@@ -39,7 +39,8 @@ sandbox is on.
 ## Things you cannot do
 
 - Open a browser (`xdg-open` is disabled): print the link for the user.
-- Run GUI programs: there is no display. Browsers (Playwright, Chrome) must run headless.
+- Run GUI programs, unless `WAYLAND_DISPLAY` is set (the project enabled `OCSB_DISPLAY=1`): then
+  windows open on the user's desktop through Wayland. Without it browsers must run headless.
 - `sudo`, `systemd-run`: denied.
 - Start processes outside the sandbox through the session bus: only desktop notifications
   are reachable.