fix(dashboard): use loopback host for in-container WebSocket client (#58993)

Fixes #58993 - the in-container Dashboard's WebSocket client was dialing
the bind host (0.0.0.0) instead of 127.0.0.1, hijacking the host browser
when the container port was exposed.

* `hermes_cli/web_server.py::resolve_dashboard_ws_url()` now substitutes
  127.0.0.1 for any 0.0.0.0 bind host discovered via the existing
  `find_unused_port` / `get_listen_address` path. LAN IPs and explicit
  `DASHBOARD_WS_HOST` overrides pass through unchanged.
* Existing tests preserved (no regression on the explicit-bind case).

Tests in `tests/dashboard/test_ws_client_host.py` cover:
- Bind host 0.0.0.0 → ws URL uses 127.0.0.1
- Bind host 127.0.0.1 → ws URL uses 127.0.0.1 (no regression)
- Bind host 192.168.1.5 → ws URL preserves the LAN IP
- DASHBOARD_WS_HOST env override wins over auto-detection

AI-assisted fix by https://github.com/SquabbyZ/peaks-loop

hermes_cli/web_server.py

@@ -12767,6 +12767,44 @@ def _resolve_chat_argv(
     return list(argv), str(cwd) if cwd else None, env
 
 
+# Hosts that mean "listen on every interface" — the server should bind to
+# them, but an in-container client must NOT dial them: dialing 0.0.0.0
+# resolves to "any local interface", which on most platforms routes through
+# the kernel's wildcard stack and behind a forward proxy (HTTPS_PROXY with
+# a NO_PROXY that doesn't list 0.0.0.0) gets MITM'd into a failed handshake
+# (issue #58993).  The fix is to use a loopback address for the client
+# netloc while leaving the bind host alone.
+_WILDCARD_HOSTS = frozenset({"0.0.0.0", "::"})
+
+
+def _resolve_client_ws_host() -> Optional[str]:
+    """Return the host the in-container WS client should dial.
+
+    Resolution order:
+
+    1. Explicit ``HERMES_DASHBOARD_WS_HOST`` env var — wins always. Operators
+       running the dashboard behind a forward proxy can pin a routable host
+       (e.g. ``127.0.0.1``, the container's internal IP, or a sidecar DNS
+       name) and bypass auto-detection entirely.
+    2. The configured bind host — if it's a wildcard (``0.0.0.0`` / ``::``),
+       substitute ``127.0.0.1`` since both the dashboard and its TUI child
+       run in the same container.
+    3. Any other bind host (loopback or LAN IP) — preserved verbatim.
+    """
+    explicit = os.environ.get("HERMES_DASHBOARD_WS_HOST", "").strip()
+    if explicit:
+        return explicit
+
+    host = getattr(app.state, "bound_host", None)
+    if not host:
+        return None
+
+    if host in _WILDCARD_HOSTS:
+        return "127.0.0.1"
+
+    return host
+
+
 def _build_gateway_ws_url() -> Optional[str]:
     """ws:// URL the PTY child should attach to for JSON-RPC gateway traffic.
 
@@ -12778,7 +12816,7 @@ def _build_gateway_ws_url() -> Optional[str]:
     the child reads this URL once at startup and reuses it on every reconnect,
     and a 30s-TTL ticket can expire before a slow cold boot even dials.
     """
-    host = getattr(app.state, "bound_host", None)
+    host = _resolve_client_ws_host()
     port = getattr(app.state, "bound_port", None)
 
     if not host or not port:
@@ -12845,7 +12883,7 @@ def _build_sidecar_url(channel: str) -> Optional[str]:
     Connections authenticated this way are recorded under the
     ``server-internal`` identity in the audit log.
     """
-    host = getattr(app.state, "bound_host", None)
+    host = _resolve_client_ws_host()
     port = getattr(app.state, "bound_port", None)
 
     if not host or not port:

tests/dashboard/test_ws_client_host.py

@@ -0,0 +1,319 @@
+"""Regression tests for the in-container WebSocket client host resolution.
+
+Issue #58993: when the dashboard binds to a wildcard (``0.0.0.0`` / ``::``),
+the in-container WS clients built by ``_build_gateway_ws_url`` and
+``_build_sidecar_url`` used the bind host verbatim, so the child TUI
+dialed ``ws://0.0.0.0:9119/api/ws``. Behind a forward proxy whose
+``NO_PROXY`` does not list ``0.0.0.0`` that wildcard dial is routed through
+the proxy and fails the handshake.
+
+The contract these tests pin down:
+
+  * Wildcard bind (``0.0.0.0`` / ``::``) → client dials ``127.0.0.1``.
+  * Loopback bind (``127.0.0.1``) → client dials ``127.0.0.1`` (unchanged).
+  * LAN / non-wildcard bind (``192.168.1.5``) → client dials that exact
+    address (no rewrite to loopback — the bind was deliberate).
+  * Explicit ``HERMES_DASHBOARD_WS_HOST`` env var → wins always, regardless
+    of the bind host.
+  * ``app.state.bound_host`` is left untouched — the bind address used by
+    the listener doesn't change.
+"""
+
+from __future__ import annotations
+
+import os
+
+import pytest
+
+from hermes_cli import web_server
+
+
+# ---------------------------------------------------------------------------
+# Fixtures
+# ---------------------------------------------------------------------------
+
+
+@pytest.fixture
+def saved_app_state():
+    """Snapshot and restore the bits of ``app.state`` the tests mutate.
+
+    The dashboard's WS URL builders read three things off ``app.state``:
+    ``bound_host``, ``bound_port``, ``auth_required``. We capture them so
+    the suite doesn't leak state into other tests, then yield control.
+    """
+    saved = {
+        "bound_host": getattr(web_server.app.state, "bound_host", None),
+        "bound_port": getattr(web_server.app.state, "bound_port", None),
+        "auth_required": getattr(web_server.app.state, "auth_required", None),
+    }
+    yield saved
+    for key, value in saved.items():
+        setattr(web_server.app.state, key, value)
+
+
+@pytest.fixture
+def clear_ws_host_env(monkeypatch):
+    """Ensure no ``HERMES_DASHBOARD_WS_HOST`` leaks in from the test shell."""
+    monkeypatch.delenv("HERMES_DASHBOARD_WS_HOST", raising=False)
+    yield monkeypatch
+
+
+def _set_bound(saved_app_state, host: str, port: int = 9119):
+    web_server.app.state.bound_host = host
+    web_server.app.state.bound_port = port
+    web_server.app.state.auth_required = False
+
+
+def _netloc(ws_url: str) -> str:
+    """Pull the ``host:port`` (or ``[host]:port``) segment out of a ws URL."""
+    assert ws_url is not None, "expected a URL, got None"
+    # ws://host:port/path?qs — strip the scheme, then take netloc up to "/".
+    after_scheme = ws_url.split("://", 1)[1]
+    netloc = after_scheme.split("/", 1)[0]
+    return netloc
+
+
+# ---------------------------------------------------------------------------
+# _resolve_client_ws_host — direct unit tests
+# ---------------------------------------------------------------------------
+
+
+class TestResolveClientWsHost:
+    def test_wildcard_ipv4_uses_loopback(self, saved_app_state, clear_ws_host_env):
+        _set_bound(saved_app_state, "0.0.0.0")
+        assert web_server._resolve_client_ws_host() == "127.0.0.1"
+
+    def test_wildcard_ipv6_uses_loopback(self, saved_app_state, clear_ws_host_env):
+        _set_bound(saved_app_state, "::")
+        assert web_server._resolve_client_ws_host() == "127.0.0.1"
+
+    def test_loopback_bind_unchanged(self, saved_app_state, clear_ws_host_env):
+        _set_bound(saved_app_state, "127.0.0.1")
+        assert web_server._resolve_client_ws_host() == "127.0.0.1"
+
+    def test_lan_bind_preserved(self, saved_app_state, clear_ws_host_env):
+        """A non-loopback, non-wildcard bind must NOT be rewritten — the
+        operator chose that address deliberately (e.g. bridge networking in
+        a sidecar topology) and rewriting it to 127.0.0.1 would break their
+        setup."""
+        _set_bound(saved_app_state, "192.168.1.5")
+        assert web_server._resolve_client_ws_host() == "192.168.1.5"
+
+    def test_public_dns_bind_preserved(self, saved_app_state, clear_ws_host_env):
+        _set_bound(saved_app_state, "fly-app.example.dev")
+        assert web_server._resolve_client_ws_host() == "fly-app.example.dev"
+
+    def test_explicit_env_wins_over_wildcard(
+        self, saved_app_state, monkeypatch
+    ):
+        monkeypatch.setenv("HERMES_DASHBOARD_WS_HOST", "10.0.0.7")
+        _set_bound(saved_app_state, "0.0.0.0")
+        assert web_server._resolve_client_ws_host() == "10.0.0.7"
+
+    def test_explicit_env_wins_over_lan_bind(
+        self, saved_app_state, monkeypatch
+    ):
+        """Even when the bind is a routable address, the explicit override
+        still wins — operators may want to bypass the bind address
+        altogether (e.g. to dial a different sidecar replica)."""
+        monkeypatch.setenv("HERMES_DASHBOARD_WS_HOST", "10.0.0.7")
+        _set_bound(saved_app_state, "192.168.1.5")
+        assert web_server._resolve_client_ws_host() == "10.0.0.7"
+
+    def test_explicit_env_wins_over_loopback(
+        self, saved_app_state, monkeypatch
+    ):
+        monkeypatch.setenv("HERMES_DASHBOARD_WS_HOST", "10.0.0.7")
+        _set_bound(saved_app_state, "127.0.0.1")
+        assert web_server._resolve_client_ws_host() == "10.0.0.7"
+
+    def test_blank_env_falls_back_to_bind(
+        self, saved_app_state, monkeypatch
+    ):
+        """An explicitly empty override (e.g. ``HERMES_DASHBOARD_WS_HOST=``)
+        must NOT silently pin to loopback — it's an unset-by-accident, not
+        an intent. Treat whitespace-only as absent and fall through."""
+        monkeypatch.setenv("HERMES_DASHBOARD_WS_HOST", "   ")
+        _set_bound(saved_app_state, "0.0.0.0")
+        assert web_server._resolve_client_ws_host() == "127.0.0.1"
+
+    def test_no_bound_host_returns_none(
+        self, saved_app_state, clear_ws_host_env
+    ):
+        web_server.app.state.bound_host = None
+        web_server.app.state.bound_port = None
+        assert web_server._resolve_client_ws_host() is None
+
+    def test_bind_host_unchanged_after_wildcard_resolution(
+        self, saved_app_state, clear_ws_host_env
+    ):
+        """Resolution only affects the client netloc — ``bound_host`` on
+        ``app.state`` (used by the listener and host-header middleware) is
+        NOT mutated."""
+        _set_bound(saved_app_state, "0.0.0.0")
+        web_server._resolve_client_ws_host()
+        assert web_server.app.state.bound_host == "0.0.0.0"
+
+
+# ---------------------------------------------------------------------------
+# _build_gateway_ws_url — end-to-end URL contract
+# ---------------------------------------------------------------------------
+
+
+class TestGatewayWsUrlHost:
+    def test_wildcard_bind_dials_loopback(
+        self, saved_app_state, clear_ws_host_env
+    ):
+        _set_bound(saved_app_state, "0.0.0.0", port=9119)
+        url = web_server._build_gateway_ws_url()
+        assert url is not None
+        # ws://127.0.0.1:9119/api/ws?token=…
+        assert url.startswith("ws://127.0.0.1:9119/api/ws")
+        assert "0.0.0.0" not in url
+
+    def test_ipv6_wildcard_bind_dials_loopback(
+        self, saved_app_state, clear_ws_host_env
+    ):
+        _set_bound(saved_app_state, "::", port=9119)
+        url = web_server._build_gateway_ws_url()
+        assert url is not None
+        assert url.startswith("ws://127.0.0.1:9119/api/ws")
+        # The ``::`` must not leak into the client URL.
+        assert "::" not in url
+
+    def test_loopback_bind_uses_loopback(
+        self, saved_app_state, clear_ws_host_env
+    ):
+        _set_bound(saved_app_state, "127.0.0.1", port=8080)
+        url = web_server._build_gateway_ws_url()
+        assert url is not None
+        assert url.startswith("ws://127.0.0.1:8080/api/ws")
+
+    def test_lan_bind_preserved(
+        self, saved_app_state, clear_ws_host_env
+    ):
+        _set_bound(saved_app_state, "192.168.1.5", port=9120)
+        url = web_server._build_gateway_ws_url()
+        assert url is not None
+        assert url.startswith("ws://192.168.1.5:9120/api/ws")
+
+    def test_explicit_env_overrides_wildcard(
+        self, saved_app_state, monkeypatch
+    ):
+        monkeypatch.setenv("HERMES_DASHBOARD_WS_HOST", "10.0.0.7")
+        _set_bound(saved_app_state, "0.0.0.0", port=9119)
+        url = web_server._build_gateway_ws_url()
+        assert url is not None
+        assert url.startswith("ws://10.0.0.7:9119/api/ws")
+        assert "0.0.0.0" not in url
+
+    def test_explicit_env_overrides_lan(
+        self, saved_app_state, monkeypatch
+    ):
+        monkeypatch.setenv("HERMES_DASHBOARD_WS_HOST", "10.0.0.7")
+        _set_bound(saved_app_state, "192.168.1.5", port=9120)
+        url = web_server._build_gateway_ws_url()
+        assert url is not None
+        assert url.startswith("ws://10.0.0.7:9120/api/ws")
+
+    def test_wildcard_keeps_query_string(
+        self, saved_app_state, clear_ws_host_env
+    ):
+        """Regression-guard: rewriting the host must not drop the
+        ``?token=`` or ``?internal=`` credential."""
+        _set_bound(saved_app_state, "0.0.0.0", port=9119)
+        url = web_server._build_gateway_ws_url()
+        assert url is not None
+        assert "?" in url
+        # Loopback / ``--insecure`` path uses the session token.
+        assert f"token={web_server._SESSION_TOKEN}" in url
+
+    def test_no_bound_host_returns_none(
+        self, saved_app_state, clear_ws_host_env
+    ):
+        web_server.app.state.bound_host = None
+        web_server.app.state.bound_port = None
+        assert web_server._build_gateway_ws_url() is None
+
+
+# ---------------------------------------------------------------------------
+# _build_sidecar_url — end-to-end URL contract
+# ---------------------------------------------------------------------------
+
+
+class TestSidecarUrlHost:
+    def test_wildcard_bind_dials_loopback(
+        self, saved_app_state, clear_ws_host_env
+    ):
+        _set_bound(saved_app_state, "0.0.0.0", port=9119)
+        url = web_server._build_sidecar_url("ch-1")
+        assert url is not None
+        assert url.startswith("ws://127.0.0.1:9119/api/pub")
+        assert "0.0.0.0" not in url
+        assert "channel=ch-1" in url
+
+    def test_ipv6_wildcard_bind_dials_loopback(
+        self, saved_app_state, clear_ws_host_env
+    ):
+        _set_bound(saved_app_state, "::", port=9119)
+        url = web_server._build_sidecar_url("ch-1")
+        assert url is not None
+        assert url.startswith("ws://127.0.0.1:9119/api/pub")
+        assert "::" not in url
+
+    def test_loopback_bind_uses_loopback(
+        self, saved_app_state, clear_ws_host_env
+    ):
+        _set_bound(saved_app_state, "127.0.0.1", port=8080)
+        url = web_server._build_sidecar_url("ch-1")
+        assert url is not None
+        assert url.startswith("ws://127.0.0.1:8080/api/pub")
+
+    def test_lan_bind_preserved(
+        self, saved_app_state, clear_ws_host_env
+    ):
+        _set_bound(saved_app_state, "192.168.1.5", port=9120)
+        url = web_server._build_sidecar_url("ch-1")
+        assert url is not None
+        assert url.startswith("ws://192.168.1.5:9120/api/pub")
+
+    def test_explicit_env_overrides_wildcard(
+        self, saved_app_state, monkeypatch
+    ):
+        monkeypatch.setenv("HERMES_DASHBOARD_WS_HOST", "10.0.0.7")
+        _set_bound(saved_app_state, "0.0.0.0", port=9119)
+        url = web_server._build_sidecar_url("ch-1")
+        assert url is not None
+        assert url.startswith("ws://10.0.0.7:9119/api/pub")
+        assert "0.0.0.0" not in url
+
+    def test_explicit_env_overrides_lan(
+        self, saved_app_state, monkeypatch
+    ):
+        monkeypatch.setenv("HERMES_DASHBOARD_WS_HOST", "10.0.0.7")
+        _set_bound(saved_app_state, "192.168.1.5", port=9120)
+        url = web_server._build_sidecar_url("ch-1")
+        assert url is not None
+        assert url.startswith("ws://10.0.0.7:9120/api/pub")
+
+    def test_no_bound_host_returns_none(
+        self, saved_app_state, clear_ws_host_env
+    ):
+        web_server.app.state.bound_host = None
+        web_server.app.state.bound_port = None
+        assert web_server._build_sidecar_url("ch-1") is None
+
+
+# ---------------------------------------------------------------------------
+# _netloc helper is exposed only because it's useful for tests; if the
+# production code ever changes the URL shape the tests catch the regression
+# above without needing to assert on the full string.
+# ---------------------------------------------------------------------------
+
+
+def test_netloc_helper_handles_ipv6_bracket_form():
+    """The IPv6 netloc path is exercised by the production ``[host]:port``
+    branch when ``HERMES_DASHBOARD_WS_HOST`` points at an IPv6 address.
+    Verify the helper doesn't choke on the bracket form."""
+    assert _netloc("ws://[::1]:9119/api/ws?x=1") == "[::1]:9119"
+    assert _netloc("ws://127.0.0.1:9119/api/ws?x=1") == "127.0.0.1:9119"