fix(extension): detect browser error pages earlier

- Add shared browser error URL detection for Chrome, Edge, Brave, and Firefox-style about:error pages.
- Short-circuit read-only DOM and HTML commands with safe fallbacks when tabs are already on browser error pages.
- Fail navigation waits, DOM waits, polling, and URL watches with clearer error-page messages.
- Bump package and extension version to 0.9.8 and extend regression coverage for cross-browser error-page handling.

.gitea/workflows/testing.yml

@@ -21,3 +21,27 @@ jobs:
 
       - name: Run tests
         run: uv run pytest
+
+  remote-protocol-compat:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        browser-cli-client-version:
+          - "0.9.3"
+          - "0.9.5"
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
+
+      - name: Install dependencies
+        run: uv sync --group dev --managed-python
+
+      - name: Run remote protocol compatibility matrix
+        env:
+          BROWSER_CLI_COMPAT_CLIENT_VERSION: ${{ matrix.browser-cli-client-version }}
+        run: uv run pytest tests/test_remote_protocol_matrix.py -v

browser_cli/auth.py

@@ -1,4 +1,4 @@
-"""Ed25519 keypair management and challenge-response auth helpers."""
+"""Ed25519 keypair management, ML-KEM key exchange, and auth helpers."""
 import hashlib
 import json
 import os
@@ -10,6 +10,9 @@ from pathlib import Path
 
 from cryptography.exceptions import InvalidSignature
 from cryptography.hazmat.primitives.asymmetric.ed25519 import Ed25519PrivateKey, Ed25519PublicKey
+from cryptography.hazmat.primitives import hashes
+from cryptography.hazmat.primitives.ciphers.aead import ChaCha20Poly1305
+from cryptography.hazmat.primitives.kdf.hkdf import HKDF
 from cryptography.hazmat.primitives.serialization import (
     Encoding,
     NoEncryption,
@@ -103,6 +106,8 @@ def agent_find_key(selector: str | None = None) -> AgentKey | None:
     except Exception:
         return None
     for key in keys:
+        if key.comment == "(none)":
+            continue
         if selector is None or selector in key.comment:
             return key
     return None
@@ -150,34 +155,105 @@ def public_key_hex(key: Ed25519PrivateKey | AgentKey) -> str:
 # ── Canonical payload + sign/verify ───────────────────────────────────────────
 
 def canonical_payload(msg: dict) -> bytes:
-    """Deterministic JSON encoding of msg without auth fields."""
+    """Deterministic JSON encoding of msg without auth protocol fields."""
     return json.dumps(
-        {k: v for k, v in msg.items() if k not in {"pubkey", "sig"}},
+        {k: v for k, v in msg.items() if k not in {"pubkey", "sig", "pq_kex"}},
         sort_keys=True,
         separators=(",", ":"),
     ).encode("utf-8")
 
 
-def sign(key: Ed25519PrivateKey | AgentKey, nonce: bytes, msg: dict) -> bytes:
-    """Sign nonce + SHA256(canonical_payload(msg)) — works for both file keys and agent keys."""
+def _auth_message(nonce: bytes, msg: dict, pq_shared_secret: bytes | None = None) -> bytes:
+    """Bytes signed for auth; optionally binds a post-quantum KEX secret."""
     data = nonce + hashlib.sha256(canonical_payload(msg)).digest()
+    if pq_shared_secret is not None:
+        data += hashlib.sha256(b"browser-cli ml-kem-768 v1" + pq_shared_secret).digest()
+    return data
+
+
+def sign(key: Ed25519PrivateKey | AgentKey, nonce: bytes, msg: dict, pq_shared_secret: bytes | None = None) -> bytes:
+    """Sign nonce + payload hash, optionally bound to an ML-KEM shared secret."""
+    data = _auth_message(nonce, msg, pq_shared_secret)
     if isinstance(key, AgentKey):
         return agent_sign_raw(key, data)
     return key.sign(data)
 
 
-def verify(pub_hex: str, nonce: bytes, msg: dict, sig_hex: str) -> bool:
-    """Return True if sig_hex is a valid Ed25519 signature over the canonical payload."""
+def verify(pub_hex: str, nonce: bytes, msg: dict, sig_hex: str, pq_shared_secret: bytes | None = None) -> bool:
+    """Return True if sig_hex is a valid signature over the canonical payload/auth secret."""
     try:
         pub_bytes = bytes.fromhex(pub_hex)
         pub_key = Ed25519PublicKey.from_public_bytes(pub_bytes)
-        message = nonce + hashlib.sha256(canonical_payload(msg)).digest()
-        pub_key.verify(bytes.fromhex(sig_hex), message)
+        pub_key.verify(bytes.fromhex(sig_hex), _auth_message(nonce, msg, pq_shared_secret))
         return True
-    except (InvalidSignature, Exception):
+    except (InvalidSignature, ValueError):
         return False
 
 
+# ── Post-quantum key exchange (ML-KEM / Kyber) ────────────────────────────────
+
+PQ_KEX_ALG = "ML-KEM-768"
+PQ_TRANSPORT_ALG = "ML-KEM-768+ChaCha20Poly1305"
+
+
+def pq_kex_server_keypair():
+    """Return an ephemeral ML-KEM-768 private key and raw public key bytes.
+
+    Returns ``None`` when the installed cryptography/OpenSSL backend does not
+    support ML-KEM yet. The serve/client protocol treats this as graceful
+    downgrade instead of breaking local installs on older OpenSSL builds.
+    """
+    try:
+        from cryptography.hazmat.primitives.asymmetric import mlkem
+        priv = mlkem.MLKEM768PrivateKey.generate()
+        pub = priv.public_key().public_bytes_raw()
+        return priv, pub
+    except Exception:
+        return None
+
+
+def pq_kex_client_encapsulate(public_key_hex: str) -> tuple[str, bytes]:
+    """Encapsulate to a server ML-KEM public key. Returns (ciphertext_hex, secret)."""
+    from cryptography.hazmat.primitives.asymmetric import mlkem
+    pub = mlkem.MLKEM768PublicKey.from_public_bytes(bytes.fromhex(public_key_hex))
+    shared_secret, ciphertext = pub.encapsulate()
+    return ciphertext.hex(), shared_secret
+
+
+def pq_kex_server_decapsulate(private_key, ciphertext_hex: str) -> bytes:
+    """Decapsulate a client ML-KEM ciphertext and return the shared secret."""
+    return private_key.decapsulate(bytes.fromhex(ciphertext_hex))
+
+
+def _pq_transport_key(shared_secret: bytes, direction: str) -> bytes:
+    return HKDF(
+        algorithm=hashes.SHA256(),
+        length=32,
+        salt=None,
+        info=f"browser-cli pq transport v1 {direction}".encode("ascii"),
+    ).derive(shared_secret)
+
+
+def pq_encrypt(shared_secret: bytes, direction: str, plaintext: bytes) -> dict:
+    """Encrypt an app-layer frame with a key derived from the ML-KEM secret."""
+    nonce = secrets.token_bytes(12)
+    key = _pq_transport_key(shared_secret, direction)
+    ciphertext = ChaCha20Poly1305(key).encrypt(nonce, plaintext, None)
+    return {"alg": PQ_TRANSPORT_ALG, "nonce": nonce.hex(), "ciphertext": ciphertext.hex()}
+
+
+def pq_decrypt(shared_secret: bytes, direction: str, envelope: dict) -> bytes:
+    """Decrypt an app-layer frame produced by pq_encrypt()."""
+    if not isinstance(envelope, dict) or envelope.get("alg") != PQ_TRANSPORT_ALG:
+        raise ValueError("unsupported encrypted transport envelope")
+    key = _pq_transport_key(shared_secret, direction)
+    return ChaCha20Poly1305(key).decrypt(
+        bytes.fromhex(str(envelope["nonce"])),
+        bytes.fromhex(str(envelope["ciphertext"])),
+        None,
+    )
+
+
 def new_nonce() -> str:
     return secrets.token_hex(32)
 

browser_cli/cli.py

@@ -187,8 +187,8 @@ def _print_version(ctx, param, value):
     help="Browser profile alias to target (required when multiple browsers are active).",
 )
 @click.option(
-    "--remote", default=None, metavar="HOST:PORT",
-    help="Connect to a remote browser exposed via 'browser-cli serve'.",
+    "--remote", default=None, metavar="HOST[:PORT]",
+    help="Connect to a remote browser exposed via 'browser-cli serve'. Domains default to port 443.",
 )
 @click.option(
     "--key", default=None, metavar="PATH",

browser_cli/client.py

@@ -10,8 +10,10 @@ Profile selection order:
 """
 import json
 import os
+import re
 import socket
 import struct
+import sys
 import uuid
 from dataclasses import dataclass
 from multiprocessing.connection import Client as PipeClient
@@ -19,6 +21,7 @@ from pathlib import Path
 from typing import Any
 
 from browser_cli.platform import endpoint_for_alias, is_windows, registry_path
+from browser_cli.version_manager import MAX_MSG_BYTES as _MAX_MSG_BYTES
 from browser_cli.registry import load_registry
 
 try:
@@ -31,6 +34,39 @@ REGISTRY_PATH = registry_path()
 REMOTE_REGISTRY_PATH = Path(os.environ.get("XDG_CONFIG_HOME", Path.home() / ".config")) / "browser-cli" / "remotes.json"
 _DEFAULT_KEY_PATH = Path(os.environ.get("XDG_CONFIG_HOME", str(Path.home() / ".config"))) / "browser-cli" / "client.key.pem"
 
+_DEFAULT_REMOTE_PORT = 443
+
+
+def _looks_like_domain(host: str) -> bool:
+    """True if host looks like a domain name rather than an IP address or localhost."""
+    if host in {"localhost", "127.0.0.1", "::1"}:
+        return False
+    if re.match(r'^\d{1,3}(\.\d{1,3}){3}$', host):
+        return False
+    return '.' in host and any(c.isalpha() for c in host)
+
+
+def _normalize_endpoint(endpoint: str) -> str:
+    """Strip :443 from domain-like endpoints so they are stored without the default port."""
+    if not endpoint:
+        return endpoint
+    host, sep, port = endpoint.rpartition(":")
+    if sep and port == "443" and _looks_like_domain(host):
+        return host
+    return endpoint
+
+
+def _resolve_connect_endpoint(endpoint: str) -> str:
+    """Return host:port for TCP connection; domain without port defaults to :443."""
+    _, sep, _ = endpoint.rpartition(":")
+    if not sep:
+        if _looks_like_domain(endpoint):
+            return f"{endpoint}:{_DEFAULT_REMOTE_PORT}"
+        raise BrowserNotConnected(
+            f"Invalid remote endpoint '{endpoint}': expected host:port"
+        )
+    return endpoint
+
 
 class BrowserNotConnected(Exception):
     """Raised when the native host socket is not available."""
@@ -66,13 +102,14 @@ def _load_remotes() -> dict[str, dict[str, str]]:
         return {}
     if not isinstance(data, dict):
         return {}
-    return {str(endpoint): cfg for endpoint, cfg in data.items() if isinstance(cfg, dict)}
+    # normalize keys so old entries stored as "domain:443" match current lookups
+    return {_normalize_endpoint(str(endpoint)): cfg for endpoint, cfg in data.items() if isinstance(cfg, dict)}
 
 
 
 def _is_valid_key_spec(s: str) -> bool:
     """Return True if s looks like a usable key spec: 'agent', 'agent:<sel>', or a file path."""
-    return s == "agent" or s.startswith("agent:") or (not s.startswith("<") and "/" in s or Path(s).suffix in {".pem", ".key"})
+    return s == "agent" or s.startswith("agent:") or (not s.startswith("<") and ("/" in s or Path(s).suffix in {".pem", ".key"}))
 
 
 def save_remote_key(endpoint: str, key_spec: str) -> None:
@@ -107,8 +144,11 @@ def key_for_remote(endpoint: str | None) -> str | None:
 
 def _remote_display_name(endpoint: str, profile_name: str, display_name: str) -> str:
     host, sep, port = endpoint.rpartition(":")
-    remote_name = host if sep and port == "8765" else endpoint
-    return f"{remote_name}:{display_name or profile_name}"
+    if sep and (port == "8765" or (port == "443" and _looks_like_domain(host))):
+        display_endpoint = host
+    else:
+        display_endpoint = endpoint  # normalized domain (no port) or non-default port
+    return f"{display_endpoint}:{display_name or profile_name}"
 
 
 def remote_browser_targets(endpoint: str, key=None) -> list[BrowserTarget]:
@@ -238,12 +278,23 @@ def _load_private_key(key_path: "Path | str | None" = None):
 
 
 def _send_remote(endpoint: str, msg: dict, private_key=None) -> bytes | None:
-    host, _, port_str = endpoint.rpartition(":")
-    if not host or not port_str:
-        raise BrowserNotConnected(f"Invalid remote endpoint '{endpoint}': expected host:port")
-    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
-        sock.settimeout(30)
-        sock.connect((host, int(port_str)))
+    connect_ep = _resolve_connect_endpoint(endpoint)
+    host, _, port_str = connect_ep.rpartition(":")
+    port = int(port_str)
+    raw_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    raw_sock.settimeout(30)
+    try:
+        raw_sock.connect((host, port))
+        if port == 443:
+            import ssl
+            ctx = ssl.create_default_context()
+            sock = ctx.wrap_socket(raw_sock, server_hostname=host)
+        else:
+            sock = raw_sock
+    except Exception:
+        raw_sock.close()
+        raise
+    with sock:
 
         # receive challenge
         challenge_raw = _recv_all(sock)
@@ -268,17 +319,51 @@ def _send_remote(endpoint: str, msg: dict, private_key=None) -> bytes | None:
             except (IndexError, ValueError):
                 pass
 
+        pq_shared_secret = None
         if nonce_hex and private_key is not None:
-            from browser_cli.auth import sign, public_key_hex
+            from browser_cli.auth import PQ_KEX_ALG, pq_encrypt, pq_kex_client_encapsulate, sign, public_key_hex
             nonce = bytes.fromhex(nonce_hex)
-            clean_msg = {k: v for k, v in msg.items() if k not in {"token", "pubkey", "sig"}}
-            sig = sign(private_key, nonce, clean_msg)
+            clean_msg = {k: v for k, v in msg.items() if k not in {"token", "pubkey", "sig", "pq_kex", "encrypted"}}
+            kex = challenge.get("pq_kex") if isinstance(challenge, dict) else None
+            if isinstance(kex, dict) and kex.get("alg") == PQ_KEX_ALG and kex.get("public_key"):
+                ciphertext_hex, pq_shared_secret = pq_kex_client_encapsulate(str(kex["public_key"]))
+                clean_msg["pq_kex"] = {"alg": PQ_KEX_ALG, "ciphertext": ciphertext_hex}
+            else:
+                sys.stderr.write(
+                    "** WARNING: connection is not using a post-quantum key exchange algorithm.\n"
+                    "** This session may be vulnerable to store now, decrypt later attacks.\n"
+                )
+            sig = sign(private_key, nonce, clean_msg, pq_shared_secret)
             msg = {**clean_msg, "pubkey": public_key_hex(private_key), "sig": sig.hex()}
+            if pq_shared_secret is not None:
+                encrypted = pq_encrypt(pq_shared_secret, "request", json.dumps(clean_msg).encode("utf-8"))
+                msg = {
+                    "id": clean_msg.get("id"),
+                    "user_agent": clean_msg.get("user_agent"),
+                    "pubkey": public_key_hex(private_key),
+                    "sig": sig.hex(),
+                    "pq_kex": clean_msg["pq_kex"],
+                    "encrypted": encrypted,
+                }
+        else:
+            sys.stderr.write(
+                "** WARNING: connection is not using a post-quantum key exchange algorithm.\n"
+                "** This session may be vulnerable to store now, decrypt later attacks.\n"
+            )
 
         payload = json.dumps(msg).encode("utf-8")
         framed = struct.pack("<I", len(payload)) + payload
         sock.sendall(framed)
-        return _recv_all(sock)
+        response = _recv_all(sock)
+        if response is not None and pq_shared_secret is not None:
+            try:
+                from browser_cli.auth import pq_decrypt
+                envelope = json.loads(response)
+                if isinstance(envelope, dict) and "encrypted" in envelope:
+                    return pq_decrypt(pq_shared_secret, "response", envelope["encrypted"])
+            except Exception as e:
+                raise BrowserNotConnected(f"Cannot decrypt post-quantum remote response: {e}") from e
+        return response
 
 
 def _auto_route_remote(endpoint: str, key=None) -> str | None:
@@ -299,6 +384,8 @@ def send_command(command: str, args: dict | None = None, profile: str | None = N
     """Send a command to the browser and return the response data."""
     requested_profile = profile or os.environ.get("BROWSER_CLI_PROFILE")
     remote_endpoint = remote or os.environ.get("BROWSER_CLI_REMOTE")
+    if remote_endpoint:
+        remote_endpoint = _normalize_endpoint(remote_endpoint)
     remote_alias_target = None
     if not remote_endpoint and requested_profile:
         remote_alias_target = remote_target_for_alias(requested_profile)
@@ -327,22 +414,22 @@ def send_command(command: str, args: dict | None = None, profile: str | None = N
             msg["_route"] = route_profile
     else:
         private_key = None
-    payload = json.dumps(msg).encode("utf-8")
-    framed = struct.pack("<I", len(payload)) + payload
 
     try:
         if remote_endpoint:
             response = _send_remote(remote_endpoint, msg, private_key)
         elif is_windows():
+            payload = json.dumps(msg).encode("utf-8")
             sock_path = _resolve_socket(profile)
             with PipeClient(sock_path, family="AF_PIPE") as conn:
                 conn.send_bytes(payload)
                 response = conn.recv_bytes()
         else:
+            payload = json.dumps(msg).encode("utf-8")
             sock_path = _resolve_socket(profile)
             with socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) as sock:
                 sock.connect(sock_path)
-                sock.sendall(framed)
+                sock.sendall(struct.pack("<I", len(payload)) + payload)
                 response = _recv_all(sock)
     except (FileNotFoundError, ConnectionRefusedError, OSError):
         if remote_endpoint:
@@ -368,9 +455,6 @@ def send_command(command: str, args: dict | None = None, profile: str | None = N
     return result.get("data")
 
 
-_MAX_MSG_BYTES = 32 * 1024 * 1024
-
-
 def _recv_all(sock: socket.socket) -> bytes:
     raw_len = _recv_exact(sock, 4)
     msg_len = struct.unpack("<I", raw_len)[0]

browser_cli/commands/__init__.py

@@ -0,0 +1,40 @@
+import click
+from browser_cli.client import BrowserNotConnected, active_browser_targets, remote_browser_targets, send_command
+from rich.console import Console
+
+_console = Console()
+
+
+def _handle(command, args=None, profile=None):
+    try:
+        return send_command(command, args or {}, profile=profile)
+    except BrowserNotConnected as e:
+        _console.print(f"[red]Error:[/red] {e}")
+        raise SystemExit(1)
+    except RuntimeError as e:
+        _console.print(f"[red]Browser error:[/red] {e}")
+        raise SystemExit(1)
+
+
+def _handle_multi(command, args=None, profile=None, remote=None):
+    try:
+        if remote:
+            return send_command(command, args or {}, profile=profile, remote=remote)
+        return send_command(command, args or {}, profile=profile)
+    except (BrowserNotConnected, RuntimeError):
+        return None
+
+
+def _multi_browser_targets():
+    root = click.get_current_context().find_root()
+    if root.obj.get("browser_explicit"):
+        return []
+    remote = root.obj.get("remote")
+    key = root.obj.get("key")
+    if remote:
+        targets = remote_browser_targets(remote, key=key)
+    else:
+        targets = active_browser_targets(key=key)
+    if len(targets) <= 1 and not any(target.remote for target in targets):
+        return []
+    return targets

browser_cli/commands/cookies.py

@@ -1,22 +1,11 @@
 import click
-from browser_cli.client import send_command, BrowserNotConnected
+from browser_cli.commands import _handle
 from rich.console import Console
 from rich.table import Table
 
 console = Console()
 
 
-def _handle(command, args=None):
-    try:
-        return send_command(command, args or {})
-    except BrowserNotConnected as e:
-        console.print(f"[red]Error:[/red] {e}")
-        raise SystemExit(1)
-    except RuntimeError as e:
-        console.print(f"[red]Browser error:[/red] {e}")
-        raise SystemExit(1)
-
-
 @click.group("cookies")
 def cookies_group():
     """Manage browser cookies."""

browser_cli/commands/dom.py

@@ -1,5 +1,5 @@
 import click
-from browser_cli.client import send_command, BrowserNotConnected
+from browser_cli.commands import _handle
 from rich.console import Console
 from rich.table import Table
 import json
@@ -7,17 +7,6 @@ import json
 console = Console()
 
 
-def _handle(command, args=None):
-    try:
-        return send_command(command, args or {})
-    except BrowserNotConnected as e:
-        console.print(f"[red]Error:[/red] {e}")
-        raise SystemExit(1)
-    except RuntimeError as e:
-        console.print(f"[red]Browser error:[/red] {e}")
-        raise SystemExit(1)
-
-
 @click.group("dom")
 def dom_group():
     """Query and interact with page DOM elements."""

browser_cli/commands/extract.py

@@ -3,7 +3,7 @@ import re
 from html.parser import HTMLParser
 
 import click
-from browser_cli.client import send_command, BrowserNotConnected
+from browser_cli.commands import _handle
 from rich.console import Console
 from rich.table import Table
 
@@ -423,17 +423,6 @@ def _convert_html_to_markdown(html):
     return _clean_markdown_output(markdown)
 
 
-def _handle(command, args=None):
-    try:
-        return send_command(command, args or {})
-    except BrowserNotConnected as e:
-        console.print(f"[red]Error:[/red] {e}")
-        raise SystemExit(1)
-    except RuntimeError as e:
-        console.print(f"[red]Browser error:[/red] {e}")
-        raise SystemExit(1)
-
-
 @click.group("extract")
 def extract_group():
     """Extract content from the active tab."""

browser_cli/commands/groups.py

@@ -1,46 +1,11 @@
 import click
-from browser_cli.client import BrowserNotConnected, active_browser_targets, remote_browser_targets, send_command
+from browser_cli.commands import _handle, _handle_multi, _multi_browser_targets
 from rich.console import Console
 from rich.table import Table
 
 console = Console()
 
 
-def _handle(command, args=None, profile=None):
-    try:
-        return send_command(command, args or {}, profile=profile)
-    except BrowserNotConnected as e:
-        console.print(f"[red]Error:[/red] {e}")
-        raise SystemExit(1)
-    except RuntimeError as e:
-        console.print(f"[red]Browser error:[/red] {e}")
-        raise SystemExit(1)
-
-
-def _handle_multi(command, args=None, profile=None, remote=None):
-    try:
-        if remote:
-            return send_command(command, args or {}, profile=profile, remote=remote)
-        return send_command(command, args or {}, profile=profile)
-    except (BrowserNotConnected, RuntimeError):
-        return None
-
-
-def _multi_browser_targets():
-    root = click.get_current_context().find_root()
-    if root.obj.get("browser_explicit"):
-        return []
-    remote = root.obj.get("remote")
-    key = root.obj.get("key")
-    if remote:
-        targets = remote_browser_targets(remote, key=key)
-    else:
-        targets = active_browser_targets(key=key)
-    if len(targets) <= 1 and not any(target.remote for target in targets):
-        return []
-    return targets
-
-
 def _print_groups(groups: list[dict], *, show_browser: bool = False) -> None:
     if not groups:
         console.print("[yellow]No groups found[/yellow]")

browser_cli/commands/navigate.py

@@ -1,21 +1,10 @@
 import click
-from browser_cli.client import send_command, BrowserNotConnected
+from browser_cli.commands import _handle
 from rich.console import Console
 
 console = Console()
 
 
-def _handle(command, args):
-    try:
-        return send_command(command, args)
-    except BrowserNotConnected as e:
-        console.print(f"[red]Error:[/red] {e}")
-        raise SystemExit(1)
-    except RuntimeError as e:
-        console.print(f"[red]Browser error:[/red] {e}")
-        raise SystemExit(1)
-
-
 @click.group("nav")
 def nav_group():
     """Navigate — open URLs, reload, go back/forward, focus tabs."""

browser_cli/commands/page.py

@@ -1,22 +1,11 @@
 import click
-from browser_cli.client import send_command, BrowserNotConnected
+from browser_cli.commands import _handle
 from rich.console import Console
 from rich.table import Table
 
 console = Console()
 
 
-def _handle(command, args=None):
-    try:
-        return send_command(command, args or {})
-    except BrowserNotConnected as e:
-        console.print(f"[red]Error:[/red] {e}")
-        raise SystemExit(1)
-    except RuntimeError as e:
-        console.print(f"[red]Browser error:[/red] {e}")
-        raise SystemExit(1)
-
-
 @click.group("page")
 def page_group():
     """Inspect current page metadata."""

browser_cli/commands/search.py

@@ -1,6 +1,6 @@
 import click
 from urllib.parse import quote_plus
-from browser_cli.client import send_command, BrowserNotConnected
+from browser_cli.commands import _handle
 from rich.console import Console
 
 console = Console()
@@ -71,14 +71,7 @@ def _build_command(engine_key: str, help_text: str) -> click.Command:
     def _cmd(query, bg, window, group):
         terms = " ".join(query)
         url = ENGINES[engine_key].format(query=quote_plus(terms))
-        try:
-            send_command("navigate.open", {"url": url, "background": bg, "window": window, "group": group})
-        except BrowserNotConnected as e:
-            console.print(f"[red]Error:[/red] {e}")
-            raise SystemExit(1)
-        except RuntimeError as e:
-            console.print(f"[red]Browser error:[/red] {e}")
-            raise SystemExit(1)
+        _handle("navigate.open", {"url": url, "background": bg, "window": window, "group": group})
         suffix = f" in group '{group}'" if group else (f" in window '{window}'" if window else "")
         display = _DISPLAY_NAMES.get(engine_key, engine_key.capitalize())
         console.print(f"[green]Searching[/green] [cyan]{display}[/cyan]: {terms}{suffix}")

browser_cli/commands/serve.py

@@ -1,25 +1,20 @@
-import re, threading, secrets, socket, struct, click, json, sys, os
+import re, threading, secrets, socket, struct, click, json, sys
+from datetime import datetime
 from pathlib import Path
-from browser_cli.version_manager import PROTOCOL_MIN_CLIENT, parse_version, get_installed_version
-from browser_cli.compat import adapt_request, adapt_response
+
+from rich.console import Console
+
+from browser_cli.client import _recv_exact, _recv_all
+from browser_cli.compat import adapt_auth, adapt_request, adapt_response
+from browser_cli.version_manager import PROTOCOL_MIN_CLIENT, MAX_MSG_BYTES, parse_version, get_installed_version
 
 _UA_PATTERN = re.compile(r"^browser-cli/\d")
-
 _CONN_LIMIT = threading.BoundedSemaphore(64)
-_MAX_MSG_BYTES = 32 * 1024 * 1024
-from rich.console import Console
-from datetime import datetime
-
 console = Console()
 
-def _recv_exact(sock:socket.socket, n:int) -> bytes:
-  buf = b""
-  while len(buf) < n:
-    chunk = sock.recv(n - len(buf))
-    if not chunk:
-      raise ConnectionError("Connection closed")
-    buf += chunk
-  return buf
+
+def _framed_send(sock: socket.socket, data: bytes) -> None:
+  sock.sendall(struct.pack("<I", len(data)) + data)
 
 def _log(addr:tuple, command:str, profile:str|None, status:str, error:str|None=None) -> None:
   ts = datetime.now().strftime("%H:%M:%S")
@@ -30,21 +25,36 @@ def _log(addr:tuple, command:str, profile:str|None, status:str, error:str|None=N
   else:
     console.print(f"[dim]{ts}[/dim] {addr_str} {profile_str}[cyan]{command}[/cyan] [green]{status}[/green]")
 
-def _proxy_request(client_sock:socket.socket, addr:tuple, profile:str|None, auth_keys:list[str]|None, auth_keys_path:"Path|None", nonce:str) -> None:
+def _proxy_request(client_sock:socket.socket, addr:tuple, profile:str|None, auth_keys:list[str]|None, auth_keys_path:"Path|None", nonce:str, pq_private_key=None) -> None:
   from browser_cli.client import _resolve_socket, BrowserNotConnected
   from browser_cli.platform import is_windows
 
+  response_secret = None
+
+  def _send_payload(data: bytes) -> None:
+    if response_secret is not None:
+      from browser_cli.auth import pq_encrypt
+      data = json.dumps({"encrypted": pq_encrypt(response_secret, "response", data)}).encode()
+    _framed_send(client_sock, data)
+
   def _send_error(msg_id, msg:str) -> None:
     err = json.dumps({"id": msg_id, "success": False, "error": msg}).encode()
     try:
-      client_sock.sendall(struct.pack("<I", len(err)) + err)
+      _send_payload(err)
+    except OSError:
+      pass
+
+  def _send_ok(msg_id, payload) -> None:
+    out = json.dumps({"id": msg_id, "success": True, "data": payload}).encode()
+    try:
+      _send_payload(out)
     except OSError:
       pass
 
   try:
     header = _recv_exact(client_sock, 4)
     msg_len = struct.unpack("<I", header)[0]
-    if msg_len > _MAX_MSG_BYTES:
+    if msg_len > MAX_MSG_BYTES:
       _send_error(None, f"message too large ({msg_len} bytes)")
       return
     payload = _recv_exact(client_sock, msg_len)
@@ -58,25 +68,26 @@ def _proxy_request(client_sock:socket.socket, addr:tuple, profile:str|None, auth
     _log(addr, "?", None, "ERROR", "invalid JSON")
     return
 
-  msg_id = msg.get("id")
-  command = msg.get("command", "?")
-
   # ── user-agent + version check ────────────────────────────────────────────
+  msg_id = msg.get("id")
   ua = msg.get("user_agent") or ""
   if not _UA_PATTERN.match(ua):
     _send_error(msg_id, "forbidden: client required")
-    _log(addr, command, None, "DENIED", f"bad user-agent: {ua!r}")
+    _log(addr, msg.get("command", "?"), None, "DENIED", f"bad user-agent: {ua!r}")
     return
   client_ver = "0"
   try:
     client_ver = ua.split("/", 1)[1]
     if parse_version(client_ver) < parse_version(PROTOCOL_MIN_CLIENT):
       _send_error(msg_id, f"client version {client_ver} is too old; please upgrade to >= {PROTOCOL_MIN_CLIENT}")
-      _log(addr, command, None, "DENIED", f"client {client_ver} < min {PROTOCOL_MIN_CLIENT}")
+      _log(addr, msg.get("command", "?"), None, "DENIED", f"client {client_ver} < min {PROTOCOL_MIN_CLIENT}")
       return
   except (IndexError, ValueError):
     pass
 
+  msg = adapt_auth(msg, client_ver)
+  command = msg.get("command", "?")
+
   # ── auth ──────────────────────────────────────────────────────────────────
   if auth_keys is not None:
     pub = msg.get("pubkey") or ""
@@ -89,11 +100,46 @@ def _proxy_request(client_sock:socket.socket, addr:tuple, profile:str|None, auth
       _send_error(msg_id, "unauthorized: untrusted public key")
       _log(addr, command, None, "DENIED", "untrusted key")
       return
+    pq_shared_secret = None
+    transport_encrypted = False
+    if pq_private_key is not None:
+      kex = msg.get("pq_kex") or {}
+      pq_required = parse_version(client_ver) >= parse_version("0.9.5")
+      if not isinstance(kex, dict) or kex.get("alg") != "ML-KEM-768" or not kex.get("ciphertext"):
+        if pq_required:
+          _send_error(msg_id, "unauthorized: post-quantum key exchange required")
+          _log(addr, command, None, "DENIED", "missing pq kex")
+          return
+      else:
+        try:
+          from browser_cli.auth import pq_decrypt, pq_kex_server_decapsulate
+          pq_shared_secret = pq_kex_server_decapsulate(pq_private_key, str(kex["ciphertext"]))
+          if "encrypted" in msg:
+            decrypted_msg = json.loads(pq_decrypt(pq_shared_secret, "request", msg["encrypted"]))
+            if not isinstance(decrypted_msg, dict):
+              raise ValueError("encrypted request is not a JSON object")
+            decrypted_msg["pubkey"] = pub
+            decrypted_msg["sig"] = sig
+            decrypted_msg["pq_kex"] = kex
+            msg = adapt_auth(decrypted_msg, client_ver)
+            msg_id = msg.get("id", msg_id)
+            command = msg.get("command", "?")
+            transport_encrypted = True
+          elif pq_required:
+            _send_error(msg_id, "unauthorized: post-quantum encrypted transport required")
+            _log(addr, command, None, "DENIED", "missing pq transport")
+            return
+        except Exception:
+          _send_error(msg_id, "unauthorized: invalid post-quantum encrypted transport")
+          _log(addr, command, None, "DENIED", "bad pq transport")
+          return
+
     from browser_cli.auth import verify
-    if not verify(pub, bytes.fromhex(nonce), msg, sig):
+    if not verify(pub, bytes.fromhex(nonce), msg, sig, pq_shared_secret):
       _send_error(msg_id, "unauthorized: invalid signature")
       _log(addr, command, None, "DENIED", "bad signature")
       return
+    response_secret = pq_shared_secret if transport_encrypted else None
 
   if command == "browser-cli.targets":
     from browser_cli.client import active_browser_targets
@@ -101,8 +147,7 @@ def _proxy_request(client_sock:socket.socket, addr:tuple, profile:str|None, auth
       {"profile": target.profile, "displayName": target.display_name}
       for target in active_browser_targets(include_remotes=False)
     ]
-    data = json.dumps({"id": msg_id, "success": True, "data": targets}).encode()
-    client_sock.sendall(struct.pack("<I", len(data)) + data)
+    _send_ok(msg_id, targets)
     _log(addr, command, None, "OK")
     return
 
@@ -113,8 +158,7 @@ def _proxy_request(client_sock:socket.socket, addr:tuple, profile:str|None, auth
       return
     from browser_cli.auth import load_authorized_keys_with_names
     entries = [{"pubkey": pk, "name": name} for pk, name in load_authorized_keys_with_names(auth_keys_path)]
-    data = json.dumps({"id": msg_id, "success": True, "data": entries}).encode()
-    client_sock.sendall(struct.pack("<I", len(data)) + data)
+    _send_ok(msg_id, entries)
     _log(addr, command, None, "OK")
     return
 
@@ -127,20 +171,19 @@ def _proxy_request(client_sock:socket.socket, addr:tuple, profile:str|None, auth
     args = msg.get("args") or {}
     pubkey = str(args.get("pubkey") or "")
     name = str(args.get("name") or "")
-    if len(pubkey) != 64:
-      _send_error(msg_id, "invalid pubkey: expected 64 hex characters")
+    if not re.fullmatch(r"[0-9a-f]{64}", pubkey):
+      _send_error(msg_id, "invalid pubkey: expected 64 lowercase hex characters")
       _log(addr, command, None, "ERROR", "invalid pubkey")
       return
     added = add_authorized_key(auth_keys_path, pubkey, name)
-    data = json.dumps({"id": msg_id, "success": True, "data": {"added": added}}).encode()
-    client_sock.sendall(struct.pack("<I", len(data)) + data)
+    _send_ok(msg_id, {"added": added})
     _log(addr, command, None, "OK" if added else "ALREADY_TRUSTED")
     return
 
   resolved_profile = msg.get("_route") or profile
 
   # ── strip protocol fields, apply request compat shim, forward ─────────────
-  strip = {"token", "_route", "pubkey", "sig", "user_agent"}
+  strip = {"token", "_route", "pubkey", "sig", "user_agent", "pq_kex", "encrypted"}
   clean_msg = {k: v for k, v in msg.items() if k not in strip}
   clean_msg = adapt_request(clean_msg, client_ver)
   clean_payload = json.dumps(clean_msg).encode()
@@ -158,20 +201,18 @@ def _proxy_request(client_sock:socket.socket, addr:tuple, profile:str|None, auth
       from multiprocessing.connection import Client as PipeClient
       with PipeClient(sock_path, family="AF_PIPE") as pipe:
         pipe.send_bytes(clean_payload)
-        resp = pipe.recv_bytes()
-      resp = adapt_response(resp, command, client_ver)
-      client_sock.sendall(struct.pack("<I", len(resp)) + resp)
+        resp_payload = pipe.recv_bytes()
+      resp_payload = adapt_response(resp_payload, command, client_ver)
+      _send_payload(resp_payload)
     else:
       with socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) as local:
         local.connect(sock_path)
         local.sendall(clean_header + clean_payload)
-        resp_header = _recv_exact(local, 4)
-        resp_len = struct.unpack("<I", resp_header)[0]
-        resp_payload = _recv_exact(local, resp_len)
+        resp_payload = _recv_all(local)
       resp_payload = adapt_response(resp_payload, command, client_ver)
-      client_sock.sendall(struct.pack("<I", len(resp_payload)) + resp_payload)
+      _send_payload(resp_payload)
 
-    resp_data = json.loads(resp_payload if not is_windows() else resp)
+    resp_data = json.loads(resp_payload)
     if resp_data.get("success", True):
       _log(addr, command, resolved_profile, "OK")
     else:
@@ -194,17 +235,25 @@ def _handle_client(client_sock:socket.socket, addr:tuple, profile:str|None, auth
       else:
         auth_keys = None
       nonce = secrets.token_hex(32)
-      challenge = json.dumps({
+      pq_private_key = None
+      challenge_msg = {
         "type": "challenge",
         "nonce": nonce,
         "server_version": get_installed_version(),
         "min_client_version": PROTOCOL_MIN_CLIENT,
-      }).encode()
+      }
+      if auth_keys_path is not None:
+        from browser_cli.auth import PQ_KEX_ALG, pq_kex_server_keypair
+        pq_keypair = pq_kex_server_keypair()
+        if pq_keypair is not None:
+          pq_private_key, pq_public_key = pq_keypair
+          challenge_msg["pq_kex"] = {"alg": PQ_KEX_ALG, "public_key": pq_public_key.hex()}
+      challenge = json.dumps(challenge_msg).encode()
       try:
-        client_sock.sendall(struct.pack("<I", len(challenge)) + challenge)
+        _framed_send(client_sock, challenge)
       except OSError:
         return
-      _proxy_request(client_sock, addr, profile, auth_keys, auth_keys_path, nonce)
+      _proxy_request(client_sock, addr, profile, auth_keys, auth_keys_path, nonce, pq_private_key)
   finally:
     _CONN_LIMIT.release()
 

browser_cli/commands/session.py

@@ -1,45 +1,10 @@
 import click
-from browser_cli.client import active_browser_targets, remote_browser_targets, send_command, BrowserNotConnected
+from browser_cli.commands import _handle, _handle_multi, _multi_browser_targets
 from rich.console import Console
 
 console = Console()
 
 
-def _handle(command, args=None, profile=None):
-    try:
-        return send_command(command, args or {}, profile=profile)
-    except BrowserNotConnected as e:
-        console.print(f"[red]Error:[/red] {e}")
-        raise SystemExit(1)
-    except RuntimeError as e:
-        console.print(f"[red]Browser error:[/red] {e}")
-        raise SystemExit(1)
-
-
-def _handle_multi(command, args=None, profile=None, remote=None):
-    try:
-        if remote:
-            return send_command(command, args or {}, profile=profile, remote=remote)
-        return send_command(command, args or {}, profile=profile)
-    except (BrowserNotConnected, RuntimeError):
-        return None
-
-
-def _multi_browser_targets():
-    root = click.get_current_context().find_root()
-    if root.obj.get("browser_explicit"):
-        return []
-    remote = root.obj.get("remote")
-    key = root.obj.get("key")
-    if remote:
-        targets = remote_browser_targets(remote, key=key)
-    else:
-        targets = active_browser_targets(key=key)
-    if len(targets) <= 1 and not any(target.remote for target in targets):
-        return []
-    return targets
-
-
 @click.group("session")
 def session_group():
     """Save and restore browser sessions."""

browser_cli/commands/storage.py

@@ -1,22 +1,11 @@
 import json
 import click
-from browser_cli.client import send_command, BrowserNotConnected
+from browser_cli.commands import _handle
 from rich.console import Console
 
 console = Console()
 
 
-def _handle(command, args=None):
-    try:
-        return send_command(command, args or {})
-    except BrowserNotConnected as e:
-        console.print(f"[red]Error:[/red] {e}")
-        raise SystemExit(1)
-    except RuntimeError as e:
-        console.print(f"[red]Browser error:[/red] {e}")
-        raise SystemExit(1)
-
-
 @click.group("storage")
 def storage_group():
     """Read and write the page's localStorage / sessionStorage."""

browser_cli/commands/tabs.py

@@ -1,48 +1,13 @@
 import base64
 import binascii
 import click
-from browser_cli.client import BrowserNotConnected, active_browser_targets, remote_browser_targets, send_command
+from browser_cli.commands import _handle, _handle_multi, _multi_browser_targets
 from rich.console import Console
 from rich.table import Table
 
 console = Console()
 
 
-def _handle(command, args=None, profile=None):
-    try:
-        return send_command(command, args or {}, profile=profile)
-    except BrowserNotConnected as e:
-        console.print(f"[red]Error:[/red] {e}")
-        raise SystemExit(1)
-    except RuntimeError as e:
-        console.print(f"[red]Browser error:[/red] {e}")
-        raise SystemExit(1)
-
-
-def _handle_multi(command, args=None, profile=None, remote=None):
-    try:
-        if remote:
-            return send_command(command, args or {}, profile=profile, remote=remote)
-        return send_command(command, args or {}, profile=profile)
-    except (BrowserNotConnected, RuntimeError):
-        return None
-
-
-def _multi_browser_targets():
-    root = click.get_current_context().find_root()
-    if root.obj.get("browser_explicit"):
-        return []
-    remote = root.obj.get("remote")
-    key = root.obj.get("key")
-    if remote:
-        targets = remote_browser_targets(remote, key=key)
-    else:
-        targets = active_browser_targets(key=key)
-    if len(targets) <= 1 and not any(target.remote for target in targets):
-        return []
-    return targets
-
-
 def _print_tabs(tabs: list[dict], *, show_browser: bool = False) -> None:
     if not tabs:
         console.print("[yellow]No tabs found[/yellow]")

browser_cli/commands/windows.py

@@ -1,46 +1,11 @@
 import click
-from browser_cli.client import BrowserNotConnected, active_browser_targets, remote_browser_targets, send_command
+from browser_cli.commands import _handle, _handle_multi, _multi_browser_targets
 from rich.console import Console
 from rich.table import Table
 
 console = Console()
 
 
-def _handle(command, args=None, profile=None):
-    try:
-        return send_command(command, args or {}, profile=profile)
-    except BrowserNotConnected as e:
-        console.print(f"[red]Error:[/red] {e}")
-        raise SystemExit(1)
-    except RuntimeError as e:
-        console.print(f"[red]Browser error:[/red] {e}")
-        raise SystemExit(1)
-
-
-def _handle_multi(command, args=None, profile=None, remote=None):
-    try:
-        if remote:
-            return send_command(command, args or {}, profile=profile, remote=remote)
-        return send_command(command, args or {}, profile=profile)
-    except (BrowserNotConnected, RuntimeError):
-        return None
-
-
-def _multi_browser_targets():
-    root = click.get_current_context().find_root()
-    if root.obj.get("browser_explicit"):
-        return []
-    remote = root.obj.get("remote")
-    key = root.obj.get("key")
-    if remote:
-        targets = remote_browser_targets(remote, key=key)
-    else:
-        targets = active_browser_targets(key=key)
-    if len(targets) <= 1 and not any(target.remote for target in targets):
-        return []
-    return targets
-
-
 def _print_windows(windows: list[dict], *, show_browser: bool = False) -> None:
     if not windows:
         console.print("[yellow]No windows found[/yellow]")

browser_cli/compat.py

@@ -1,49 +0,0 @@
-"""
-Stripe-style version compatibility layer for browser-cli serve.
-
-When a behaviour-breaking change ships in a new server version, add one entry
-to _COMPAT below:
-
-    ("X.Y.Z", request_fn, response_fn)
-
-- ``request_fn(msg: dict) -> dict``
-      Upgrade an incoming client message from a client older than X.Y.Z to the
-      current format before forwarding it to the native host.
-- ``response_fn(resp: bytes, command: str) -> bytes``
-      Downgrade a native-host response to the format a client older than X.Y.Z
-      expects before sending it back.
-
-Either function may be ``None`` when only one direction needs adapting.
-
-Entries must stay in ascending version order.  ``adapt_request`` walks forward
-(oldest change first); ``adapt_response`` walks backward (newest change first)
-so the transformations compose correctly.
-
-Current baseline: 0.9.1  — no shims needed yet.
-"""
-
-from __future__ import annotations
-from typing import Callable
-from browser_cli.version_manager import parse_version
-
-_COMPAT: list[tuple[str, Callable[[dict], dict] | None, Callable[[bytes, str], bytes] | None]] = [
-    # ("1.0.0", _req_1_0_0, _resp_1_0_0),
-]
-
-
-def adapt_request(msg: dict, client_version: str) -> dict:
-    """Upgrade a client message to the current server format."""
-    cv = parse_version(client_version)
-    for version, req_fn, _ in _COMPAT:
-        if cv < parse_version(version) and req_fn is not None:
-            msg = req_fn(msg)
-    return msg
-
-
-def adapt_response(resp: bytes, command: str, client_version: str) -> bytes:
-    """Downgrade a server response to the format the client expects."""
-    cv = parse_version(client_version)
-    for version, _, resp_fn in reversed(_COMPAT):
-        if cv < parse_version(version) and resp_fn is not None:
-            resp = resp_fn(resp, command)
-    return resp

browser_cli/compat/__init__.py

@@ -0,0 +1,4 @@
+from browser_cli.compat.commands import adapt_request, adapt_response
+from browser_cli.compat.auth import adapt_auth
+
+__all__ = ["adapt_auth", "adapt_request", "adapt_response"]

browser_cli/compat/auth.py

@@ -0,0 +1,44 @@
+"""
+Auth-field normalizers — applied to the raw incoming message *before* the
+auth check runs.  Protocol fields (pubkey, sig, …) are still present here.
+
+Add one entry per breaking auth-field change:
+    ("X.Y.Z", transformer_fn)
+
+Entries must stay in ascending version order.
+"""
+from __future__ import annotations
+from typing import Callable
+from browser_cli.version_manager import parse_version
+
+
+# ── v0.9.3 ────────────────────────────────────────────────────────────────────
+
+def _auth_0_9_3(msg: dict) -> dict:
+    """pubkey validation tightened to lowercase hex; normalize for older clients."""
+    changed: dict = {}
+    pk = msg.get("pubkey")
+    if isinstance(pk, str) and pk:
+        changed["pubkey"] = pk.lower()
+    if msg.get("command") == "browser-cli.auth.trust":
+        args = msg.get("args") or {}
+        trust_pk = args.get("pubkey")
+        if isinstance(trust_pk, str) and trust_pk:
+            changed["args"] = {**args, "pubkey": trust_pk.lower()}
+    return {**msg, **changed} if changed else msg
+
+
+# ── registry ──────────────────────────────────────────────────────────────────
+
+_AUTH_COMPAT: list[tuple[str, Callable[[dict], dict]]] = [
+    ("0.9.3", _auth_0_9_3),
+]
+
+
+def adapt_auth(msg: dict, client_version: str) -> dict:
+    """Apply all auth normalizers needed to bring msg up to the current format."""
+    cv = parse_version(client_version)
+    for version, fn in _AUTH_COMPAT:
+        if cv < parse_version(version):
+            msg = fn(msg)
+    return msg

browser_cli/compat/commands.py

@@ -0,0 +1,43 @@
+"""
+Command-format shims — applied to clean_msg (protocol fields already stripped)
+before forwarding to the native host, and to responses before sending back.
+
+Add one entry per breaking command-format change:
+    ("X.Y.Z", request_fn, response_fn)
+
+- request_fn(msg: dict) -> dict   or None
+- response_fn(resp: bytes, command: str) -> bytes   or None
+
+Entries must stay in ascending version order.
+adapt_request walks forward (oldest first); adapt_response walks backward.
+
+Current baseline: 0.9.3 — no command-format shims needed yet.
+"""
+from __future__ import annotations
+from typing import Callable
+from browser_cli.version_manager import parse_version
+
+
+# ── registry ──────────────────────────────────────────────────────────────────
+
+_COMPAT: list[tuple[str, Callable[[dict], dict] | None, Callable[[bytes, str], bytes] | None]] = [
+    # ("1.0.0", _req_1_0_0, _resp_1_0_0),
+]
+
+
+def adapt_request(msg: dict, client_version: str) -> dict:
+    """Upgrade a client message to the current browser command format."""
+    cv = parse_version(client_version)
+    for version, req_fn, _ in _COMPAT:
+        if cv < parse_version(version) and req_fn is not None:
+            msg = req_fn(msg)
+    return msg
+
+
+def adapt_response(resp: bytes, command: str, client_version: str) -> bytes:
+    """Downgrade a native-host response to the format the client expects."""
+    cv = parse_version(client_version)
+    for version, _, resp_fn in reversed(_COMPAT):
+        if cv < parse_version(version) and resp_fn is not None:
+            resp = resp_fn(resp, command)
+    return resp

browser_cli/native_host.py

@@ -19,6 +19,7 @@ from multiprocessing.connection import Listener
 from pathlib import Path
 
 from browser_cli.platform import DEFAULT_ALIAS, endpoint_for_alias, is_windows, registry_path, runtime_dir
+from browser_cli.version_manager import MAX_MSG_BYTES as _MAX_MSG_BYTES
 from browser_cli.registry import update_registry
 
 SOCKET_PATH: str = ""          # set after hello handshake
@@ -278,6 +279,8 @@ def _recv_all(conn: socket.socket) -> bytes | None:
     if raw_len is None:
         return None
     msg_len = struct.unpack("<I", raw_len)[0]
+    if msg_len > _MAX_MSG_BYTES:
+        return None
     return _recv_exact(conn, msg_len)
 
 

browser_cli/version_manager.py

@@ -1,6 +1,7 @@
 from importlib.metadata import version as _pkg_version
 
 PROTOCOL_MIN_CLIENT = "0.9.0"
+MAX_MSG_BYTES = 32 * 1024 * 1024
 
 
 def parse_version(v: str) -> tuple[int, ...]:

extension/manifest.json

@@ -1,7 +1,7 @@
 {
   "manifest_version": 3,
   "name": "browser-cli",
-  "version": "0.9.2",
+  "version": "0.9.8",
   "description": "Control your browser from the terminal via browser-cli",
   "permissions": [
     "tabs",

extension/src/commands/dom.ts

@@ -1,23 +1,64 @@
 // @ts-nocheck
-import { executeScript, getActiveTab, isScriptableUrl } from '../core';
+import { executeScript, getActiveTab, isBrowserErrorUrl, isErrorPageScriptError, isScriptableUrl } from '../core';
 import { contentDispatch } from './injected';
-export async function domOp(funcName, args) {
-  const tab = await getActiveTab();
-  if (!isScriptableUrl(tab.url)) {
-    throw new Error(`Cannot run DOM commands on ${tab.url} — navigate to a regular web page first`);
+
+function fallbackForErrorPageDomOp(funcName, tab) {
+  switch (funcName) {
+    case "domExists":
+      return false;
+    case "domQuery":
+    case "domAttr":
+    case "domText":
+    case "extractLinks":
+    case "extractImages":
+      return [];
+    case "extractText":
+    case "extractMarkdown":
+      return "";
+    case "pageInfo":
+      return {
+        title: tab.title || "",
+        url: tab.url || tab.pendingUrl || "",
+        readyState: "error",
+        lang: null,
+        meta: {},
+      };
+    default:
+      return undefined;
   }
+}
+
+export async function domOp(funcName, args = {}) {
+  const tab = args?.tabId ? await chrome.tabs.get(args.tabId) : await getActiveTab();
+  const tabUrl = tab.url || tab.pendingUrl || "";
+  if (isBrowserErrorUrl(tabUrl)) {
+    const fallback = fallbackForErrorPageDomOp(funcName, tab);
+    if (fallback !== undefined) return fallback;
+  }
+  if (!isScriptableUrl(tabUrl)) {
+    throw new Error(`Cannot run DOM commands on ${tabUrl} — navigate to a regular web page first`);
+  }
+  try {
     const results = await executeScript({
       target: { tabId: tab.id },
       func: contentDispatch,
       args: [funcName, args],
     });
     return results[0]?.result;
+  } catch (e) {
+    if (isErrorPageScriptError(e)) {
+      const fallback = fallbackForErrorPageDomOp(funcName, tab);
+      if (fallback !== undefined) return fallback;
+    }
+    throw e;
+  }
 }
 
 export async function domEval({ code, tabId } = {}) {
   const tab = tabId ? await chrome.tabs.get(tabId) : await getActiveTab();
-  if (!isScriptableUrl(tab.url)) {
-    throw new Error(`Cannot run DOM commands on ${tab.url} — navigate to a regular web page first`);
+  const tabUrl = tab.url || tab.pendingUrl || "";
+  if (!isScriptableUrl(tabUrl) || isBrowserErrorUrl(tabUrl)) {
+    throw new Error(`Cannot run DOM commands on ${tabUrl} — navigate to a regular web page first`);
   }
   const results = await executeScript({
     target: { tabId: tab.id },
@@ -30,11 +71,17 @@ export async function domEval({ code, tabId } = {}) {
 
 export async function domWaitFor({ selector, timeout = 10000, visible = false, hidden = false, tabId } = {}) {
   const tab = tabId ? await chrome.tabs.get(tabId) : await getActiveTab();
-  if (!isScriptableUrl(tab.url)) {
-    throw new Error(`Cannot run DOM commands on ${tab.url} — navigate to a regular web page first`);
+  const tabUrl = tab.url || tab.pendingUrl || "";
+  if (isBrowserErrorUrl(tabUrl)) {
+    if (hidden) return { selector, found: false };
+    throw new Error(`Cannot wait for DOM on browser error page ${tabUrl}`);
+  }
+  if (!isScriptableUrl(tabUrl)) {
+    throw new Error(`Cannot run DOM commands on ${tabUrl} — navigate to a regular web page first`);
   }
   const deadline = Date.now() + timeout;
   while (Date.now() < deadline) {
+    try {
       const results = await executeScript({
         target: { tabId: tab.id },
         func: (sel, vis, hid) => {
@@ -50,6 +97,10 @@ export async function domWaitFor({ selector, timeout = 10000, visible = false, h
         args: [selector, visible, hidden],
       });
       if (results[0]?.result) return { selector, found: !hidden };
+    } catch (e) {
+      if (hidden && isErrorPageScriptError(e)) return { selector, found: false };
+      if (!isErrorPageScriptError(e)) throw e;
+    }
     await new Promise(r => setTimeout(r, 200));
   }
   throw new Error(`Selector '${selector}' condition not met within ${timeout}ms`);
@@ -57,12 +108,17 @@ export async function domWaitFor({ selector, timeout = 10000, visible = false, h
 
 export async function domPoll({ selector, pattern, attr, timeout = 30000, interval = 500, tabId } = {}) {
   const tab = tabId ? await chrome.tabs.get(tabId) : await getActiveTab();
-  if (!isScriptableUrl(tab.url)) {
-    throw new Error(`Cannot run DOM commands on ${tab.url} — navigate to a regular web page first`);
+  const tabUrl = tab.url || tab.pendingUrl || "";
+  if (isBrowserErrorUrl(tabUrl)) {
+    throw new Error(`Cannot poll DOM on browser error page ${tabUrl}`);
+  }
+  if (!isScriptableUrl(tabUrl)) {
+    throw new Error(`Cannot run DOM commands on ${tabUrl} — navigate to a regular web page first`);
   }
   const deadline = Date.now() + timeout;
   const regex = new RegExp(pattern);
   while (Date.now() < deadline) {
+    try {
       const results = await executeScript({
         target: { tabId: tab.id },
         func: (sel, a) => {
@@ -75,8 +131,10 @@ export async function domPoll({ selector, pattern, attr, timeout = 30000, interv
       });
       const value = results[0]?.result;
       if (value != null && regex.test(String(value))) return { selector, value, pattern };
+    } catch (e) {
+      if (!isErrorPageScriptError(e)) throw e;
+    }
     await new Promise(r => setTimeout(r, interval));
   }
   throw new Error(`Selector '${selector}' did not match '${pattern}' within ${timeout}ms`);
 }
-

extension/src/commands/navigation.ts

@@ -1,5 +1,5 @@
 // @ts-nocheck
-import { getActiveTab, getAliases, resolveGroupId, tabInfo } from '../core';
+import { getActiveTab, getAliases, isBrowserErrorUrl, resolveGroupId, tabInfo } from '../core';
 export async function navOpen({ url, background, window: windowName, windowId: explicitWindowId, group: groupNameOrId }) {
   let windowId;
   if (explicitWindowId != null) {
@@ -77,6 +77,10 @@ export async function navWait({ tabId, timeout = 30000, readyState = "complete"
   const interval = 200;
   while (Date.now() < deadline) {
     const t = await chrome.tabs.get(tab.id);
+    const currentUrl = t.url || t.pendingUrl || "";
+    if (isBrowserErrorUrl(currentUrl)) {
+      throw new Error(`Tab ${tab.id} is showing an error page while waiting for load (${currentUrl})`);
+    }
     if (readyState === "complete" ? t.status === "complete" : t.status !== "loading") {
       return tabInfo(t);
     }

extension/src/commands/tabs.ts

@@ -1,5 +1,5 @@
 // @ts-nocheck
-import { executeScript, getActiveTab, getAliases, isScriptableUrl, resolveTabForDirectAction, tabInfo } from '../core';
+import { executeScript, getActiveTab, getAliases, isBrowserErrorUrl, isErrorPageScriptError, isScriptableUrl, resolveTabForDirectAction, tabInfo } from '../core';
 export async function tabsList() {
   const windows = await chrome.windows.getAll({ populate: true });
   const aliases = await getAliases();
@@ -102,8 +102,12 @@ export async function tabsQuery({ search }) {
 export async function tabsHtml({ tabId }) {
   for (let i = 0; i < 3; i++) {
     const tab = tabId ? await chrome.tabs.get(tabId) : await getActiveTab();
-    if (!isScriptableUrl(tab.url || tab.pendingUrl || "")) {
-      throw new Error(`Cannot get HTML of ${tab.url || tab.pendingUrl} — navigate to a regular web page first`);
+    const tabUrl = tab.url || tab.pendingUrl || "";
+    if (isBrowserErrorUrl(tabUrl)) {
+      return "";
+    }
+    if (!isScriptableUrl(tabUrl)) {
+      throw new Error(`Cannot get HTML of ${tabUrl} — navigate to a regular web page first`);
     }
     try {
       const results = await executeScript({
@@ -112,7 +116,8 @@ export async function tabsHtml({ tabId }) {
       });
       return results[0]?.result || "";
     } catch (e) {
-      const transient = e.message && (e.message.includes("Frame with ID") || e.message.includes("No tab with id")) && !e.message.includes("error page");
+      if (isErrorPageScriptError(e)) return "";
+      const transient = e.message && (e.message.includes("Frame with ID") || e.message.includes("No tab with id"));
       if (i < 2 && transient) {
         await new Promise(r => setTimeout(r, 300));
         continue;
@@ -191,13 +196,26 @@ export async function tabsWatchUrl({ pattern, timeout = 30000, tabId } = {}) {
   const tab = tabId ? await chrome.tabs.get(tabId) : await getActiveTab();
   const deadline = Date.now() + timeout;
   const regex = new RegExp(pattern);
+  let lastUrl = tab.url || tab.pendingUrl || "";
+  let lastStatus = tab.status || "unknown";
+
+  const matches = (url) => {
+    regex.lastIndex = 0;
+    return Boolean(url && regex.test(url));
+  };
+  if (matches(lastUrl)) return tabInfo(tab);
+
   while (Date.now() < deadline) {
     const t = await chrome.tabs.get(tab.id);
-    const url = t.url || t.pendingUrl || "";
-    if (regex.test(url)) return tabInfo(t);
+    lastUrl = t.url || t.pendingUrl || "";
+    lastStatus = t.status || "unknown";
+    if (matches(t.pendingUrl || "") || matches(t.url || "")) return tabInfo(t);
+    if (isBrowserErrorUrl(t.url || "")) {
+      throw new Error(`Tab ${tab.id} is showing an error page while waiting for URL to match '${pattern}'`);
+    }
     await new Promise(r => setTimeout(r, 200));
   }
-  throw new Error(`Tab ${tab.id} URL did not match '${pattern}' within ${timeout}ms`);
+  throw new Error(`Tab ${tab.id} URL did not match '${pattern}' within ${timeout}ms (last URL: '${lastUrl}', status: '${lastStatus}')`);
 }
 
 export async function tabsMute({ tabId }) {

extension/src/core.ts

@@ -5,12 +5,39 @@ export async function getProfileAlias() {
   return profileAlias || "default";
 }
 
+export function isBrowserErrorUrl(url) {
+  const value = String(url || "").toLowerCase();
+  return value.startsWith("chrome-error://") ||
+         value.startsWith("edge-error://") ||
+         value.startsWith("brave-error://") ||
+         value.startsWith("about:neterror") ||
+         value.startsWith("about:certerror") ||
+         value.startsWith("about:blocked") ||
+         value.startsWith("about:tabcrashed");
+}
+
+export function isErrorPageScriptError(error) {
+  const message = String(error?.message || error || "").toLowerCase();
+  return message.includes("error page") ||
+         message.includes("chrome-error://") ||
+         message.includes("edge-error://") ||
+         message.includes("brave-error://") ||
+         message.includes("about:neterror") ||
+         message.includes("about:certerror") ||
+         message.includes("about:tabcrashed");
+}
+
+export function isTransientScriptError(error) {
+  const message = String(error?.message || error || "");
+  return message.includes("Frame with ID") || message.includes("No tab with id") || isErrorPageScriptError(error);
+}
+
 export async function executeScript(options, retries = 3) {
   for (let i = 0; i < retries; i++) {
     try {
       return await chrome.scripting.executeScript(options);
     } catch (e) {
-      if (i < retries - 1 && e.message && (e.message.includes("Frame with ID") || e.message.includes("No tab with id")) && !e.message.includes("error page")) {
+      if (i < retries - 1 && isTransientScriptError(e)) {
         await new Promise(r => setTimeout(r, 300));
         continue;
       }

pyproject.toml

@@ -1,11 +1,11 @@
 [project]
 name = "browser-cli"
-version = "0.9.2"
+version = "0.9.8"
 description = "Control your real running browser from the terminal via a browser extension"
 requires-python = ">=3.10"
 dependencies = [
     "click>=8",
-    "cryptography>=42",
+    "cryptography>=48",
     "rich>=13",
 ]
 

tests/test_auth.py

@@ -0,0 +1,206 @@
+import json
+import tempfile
+from pathlib import Path
+
+import pytest
+
+from browser_cli.auth import (
+    add_authorized_key,
+    canonical_payload,
+    generate_keypair,
+    load_authorized_keys,
+    load_authorized_keys_with_names,
+    load_private_key,
+    new_nonce,
+    pq_decrypt,
+    pq_encrypt,
+    pq_kex_client_encapsulate,
+    pq_kex_server_decapsulate,
+    pq_kex_server_keypair,
+    sign,
+    verify,
+)
+from browser_cli.client import _is_valid_key_spec
+
+
+class TestGenerateKeypair:
+    def test_returns_pem_and_hex(self):
+        pem, pub_hex = generate_keypair()
+        assert pem.startswith(b"-----BEGIN PRIVATE KEY-----")
+        assert len(pub_hex) == 64
+
+    def test_each_call_unique(self):
+        _, pub1 = generate_keypair()
+        _, pub2 = generate_keypair()
+        assert pub1 != pub2
+
+
+class TestCanonicalPayload:
+    def test_strips_auth_protocol_fields(self):
+        msg = {"command": "tabs.list", "id": "x", "pubkey": "abc", "sig": "def", "pq_kex": {"alg": "ML-KEM-768"}}
+        data = json.loads(canonical_payload(msg))
+        assert "pubkey" not in data
+        assert "sig" not in data
+        assert "pq_kex" not in data
+
+    def test_keys_sorted(self):
+        msg = {"z": 1, "a": 2, "m": 3}
+        payload = canonical_payload(msg).decode()
+        assert payload.index('"a"') < payload.index('"m"') < payload.index('"z"')
+
+    def test_deterministic(self):
+        msg = {"b": 2, "a": 1}
+        assert canonical_payload(msg) == canonical_payload(msg)
+
+
+@pytest.fixture()
+def keypair(tmp_path):
+    pem, pub_hex = generate_keypair()
+    key_path = tmp_path / "client.key.pem"
+    key_path.write_bytes(pem)
+    priv = load_private_key(key_path)
+    return priv, pub_hex
+
+
+class TestSignVerify:
+    def test_valid_signature_verifies(self, keypair):
+        priv, pub_hex = keypair
+        nonce = bytes.fromhex(new_nonce())
+        msg = {"command": "tabs.list", "id": "uuid-1", "args": {}}
+        sig = sign(priv, nonce, msg).hex()
+        assert verify(pub_hex, nonce, msg, sig) is True
+
+    def test_tampered_sig_fails(self, keypair):
+        priv, pub_hex = keypair
+        nonce = bytes.fromhex(new_nonce())
+        msg = {"command": "tabs.list", "id": "x"}
+        sign(priv, nonce, msg)
+        assert verify(pub_hex, nonce, msg, "00" * 64) is False
+
+    def test_wrong_pubkey_fails(self, keypair):
+        priv, _ = keypair
+        _, other_pub = generate_keypair()
+        nonce = bytes.fromhex(new_nonce())
+        msg = {"command": "tabs.list"}
+        sig = sign(priv, nonce, msg).hex()
+        assert verify(other_pub, nonce, msg, sig) is False
+
+    def test_wrong_nonce_fails(self, keypair):
+        priv, pub_hex = keypair
+        nonce = bytes.fromhex(new_nonce())
+        msg = {"command": "tabs.list"}
+        sig = sign(priv, nonce, msg).hex()
+        other_nonce = bytes.fromhex(new_nonce())
+        assert verify(pub_hex, other_nonce, msg, sig) is False
+
+    def test_post_quantum_shared_secret_is_bound_to_signature(self, keypair):
+        priv, pub_hex = keypair
+        nonce = bytes.fromhex(new_nonce())
+        msg = {"command": "tabs.list", "pq_kex": {"alg": "ML-KEM-768", "ciphertext": "abcd"}}
+        sig = sign(priv, nonce, msg, b"shared-secret").hex()
+        assert verify(pub_hex, nonce, msg, sig, b"shared-secret") is True
+        assert verify(pub_hex, nonce, msg, sig, b"other-secret") is False
+        assert verify(pub_hex, nonce, msg, sig) is False
+
+    def test_garbage_pub_hex_returns_false_not_exception(self):
+        assert verify("not-hex!!!!", b"nonce", {}, "00" * 64) is False
+
+    def test_truncated_sig_hex_returns_false_not_exception(self, keypair):
+        _, pub_hex = keypair
+        assert verify(pub_hex, b"nonce", {}, "aabb") is False
+
+    def test_wrong_length_pubkey_returns_false_not_exception(self):
+        assert verify("aabbcc", b"nonce", {}, "00" * 64) is False
+
+
+class TestPostQuantumKex:
+    def test_mlkem_roundtrip_when_backend_supports_it(self):
+        keypair = pq_kex_server_keypair()
+        if keypair is None:
+            pytest.skip("ML-KEM backend not available")
+        priv, pub = keypair
+
+        ciphertext_hex, client_secret = pq_kex_client_encapsulate(pub.hex())
+        server_secret = pq_kex_server_decapsulate(priv, ciphertext_hex)
+
+        assert server_secret == client_secret
+        assert len(server_secret) == 32
+
+    def test_pq_transport_encrypt_decrypt_roundtrip(self):
+        secret = b"s" * 32
+        plaintext = b'{"command":"tabs.list"}'
+
+        envelope = pq_encrypt(secret, "request", plaintext)
+
+        assert envelope["alg"] == "ML-KEM-768+ChaCha20Poly1305"
+        assert plaintext.hex() not in envelope["ciphertext"]
+        assert pq_decrypt(secret, "request", envelope) == plaintext
+
+    def test_pq_transport_direction_is_bound(self):
+        secret = b"s" * 32
+        envelope = pq_encrypt(secret, "request", b"payload")
+
+        with pytest.raises(Exception):
+            pq_decrypt(secret, "response", envelope)
+
+
+class TestAuthorizedKeys:
+    def test_add_and_load(self, tmp_path):
+        path = tmp_path / "authorized_keys"
+        _, pub = generate_keypair()
+        assert add_authorized_key(path, pub, "alice") is True
+        assert pub in load_authorized_keys(path)
+
+    def test_add_duplicate_returns_false(self, tmp_path):
+        path = tmp_path / "authorized_keys"
+        _, pub = generate_keypair()
+        add_authorized_key(path, pub)
+        assert add_authorized_key(path, pub) is False
+
+    def test_load_with_names(self, tmp_path):
+        path = tmp_path / "authorized_keys"
+        _, pub1 = generate_keypair()
+        _, pub2 = generate_keypair()
+        add_authorized_key(path, pub1, "alice")
+        add_authorized_key(path, pub2)
+        entries = load_authorized_keys_with_names(path)
+        assert (pub1, "alice") in entries
+        assert (pub2, "") in entries
+
+    def test_ignores_comment_lines(self, tmp_path):
+        path = tmp_path / "authorized_keys"
+        path.write_text("# this is a comment\n")
+        assert load_authorized_keys(path) == []
+
+    def test_returns_empty_for_missing_file(self, tmp_path):
+        assert load_authorized_keys(tmp_path / "nofile") == []
+
+
+class TestIsValidKeySpec:
+    def test_agent_bare(self):
+        assert _is_valid_key_spec("agent") is True
+
+    def test_agent_with_selector(self):
+        assert _is_valid_key_spec("agent:cardno:000012345678") is True
+
+    def test_absolute_pem_path(self):
+        assert _is_valid_key_spec("/home/user/.config/browser-cli/client.key.pem") is True
+
+    def test_dot_key_extension(self):
+        assert _is_valid_key_spec("/tmp/mykey.key") is True
+
+    def test_angled_bracket_pem_rejected(self):
+        # regression: operator precedence bug allowed "<garbage>.pem" to pass
+        assert _is_valid_key_spec("<garbage>.pem") is False
+
+    def test_angled_bracket_key_rejected(self):
+        assert _is_valid_key_spec("<garbage>.key") is False
+
+    def test_serialized_object_rejected(self):
+        assert _is_valid_key_spec("<AgentKey(blob=b'...', comment='test')>.pem") is False
+
+    def test_empty_string_rejected(self):
+        assert _is_valid_key_spec("") is False
+
+    def test_bare_filename_no_slash_no_ext_rejected(self):
+        assert _is_valid_key_spec("mykey") is False

tests/test_cli.py

@@ -262,12 +262,12 @@ def test_tabs_list_multi_browser_shows_browser_column():
         return [{"id": 1 if profile == "default" else 2, "windowId": 1, "active": True, "title": profile, "url": "https://example.com"}]
 
     with patch(
-        "browser_cli.commands.tabs.active_browser_targets",
+        "browser_cli.commands.active_browser_targets",
         return_value=[
             BrowserTarget("default", "550e8400-e29b-41d4-a716-446655440000", "/tmp/default.sock"),
             BrowserTarget("work", "work", "/tmp/work.sock"),
         ],
-    ), patch("browser_cli.commands.tabs.send_command", side_effect=fake_send_command):
+    ), patch("browser_cli.commands.send_command", side_effect=fake_send_command):
         result = CliRunner().invoke(main, ["tabs", "list"])
 
     assert result.exit_code == 0
@@ -278,13 +278,13 @@ def test_tabs_list_multi_browser_shows_browser_column():
 
 def test_tabs_list_with_remote_uses_only_remote_targets():
     with patch(
-        "browser_cli.commands.tabs.active_browser_targets",
+        "browser_cli.commands.active_browser_targets",
         side_effect=AssertionError("local targets should not be used for explicit remote"),
     ), patch(
-        "browser_cli.commands.tabs.remote_browser_targets",
+        "browser_cli.commands.remote_browser_targets",
         return_value=[BrowserTarget("work", "remote-host:work", "", remote="remote-host:8765")],
     ), patch(
-        "browser_cli.commands.tabs.send_command",
+        "browser_cli.commands.send_command",
         return_value=[{"id": 1, "windowId": 1, "active": True, "title": "Remote", "url": "https://example.com"}],
     ) as send_command:
         result = CliRunner().invoke(main, ["--remote", "remote-host:8765", "tabs", "list"])
@@ -297,13 +297,13 @@ def test_tabs_list_with_remote_uses_only_remote_targets():
 
 def test_tabs_list_with_explicit_browser_does_not_show_browser_column():
     with patch(
-        "browser_cli.commands.tabs.active_browser_targets",
+        "browser_cli.commands.active_browser_targets",
         return_value=[
             BrowserTarget("default", "uuid-1", "/tmp/default.sock"),
             BrowserTarget("work", "work", "/tmp/work.sock"),
         ],
     ), patch(
-        "browser_cli.commands.tabs.send_command",
+        "browser_cli.commands.send_command",
         return_value=[{"id": 1, "windowId": 1, "active": True, "title": "Example", "url": "https://example.com"}],
     ) as send_command:
         result = CliRunner().invoke(main, ["--browser", "work", "tabs", "list"])
@@ -322,12 +322,12 @@ def test_tabs_count_multi_browser_shows_total():
         return counts[profile]
 
     with patch(
-        "browser_cli.commands.tabs.active_browser_targets",
+        "browser_cli.commands.active_browser_targets",
         return_value=[
             BrowserTarget("default", "uuid-1", "/tmp/default.sock"),
             BrowserTarget("work", "work", "/tmp/work.sock"),
         ],
-    ), patch("browser_cli.commands.tabs.send_command", side_effect=fake_send_command):
+    ), patch("browser_cli.commands.send_command", side_effect=fake_send_command):
         result = CliRunner().invoke(main, ["tabs", "count", "github"])
 
     assert result.exit_code == 0
@@ -344,12 +344,12 @@ def test_group_count_multi_browser_shows_total():
         return counts[profile]
 
     with patch(
-        "browser_cli.commands.groups.active_browser_targets",
+        "browser_cli.commands.active_browser_targets",
         return_value=[
             BrowserTarget("default", "uuid-1", "/tmp/default.sock"),
             BrowserTarget("work", "work", "/tmp/work.sock"),
         ],
-    ), patch("browser_cli.commands.groups.send_command", side_effect=fake_send_command):
+    ), patch("browser_cli.commands.send_command", side_effect=fake_send_command):
         result = CliRunner().invoke(main, ["groups", "count"])
 
     assert result.exit_code == 0
@@ -360,7 +360,7 @@ def test_group_count_multi_browser_shows_total():
 
 def test_group_list_leaves_unnamed_group_cell_empty():
     with patch(
-        "browser_cli.commands.groups.send_command",
+        "browser_cli.commands.send_command",
         return_value=[{"id": 42, "title": "", "color": "grey", "collapsed": False, "tabCount": 1}],
     ):
         result = CliRunner().invoke(main, ["groups", "list"])
@@ -372,7 +372,7 @@ def test_group_list_leaves_unnamed_group_cell_empty():
 
 
 def test_tabs_move_accepts_right_short_alias():
-    with patch("browser_cli.commands.tabs.send_command") as send_command:
+    with patch("browser_cli.commands.send_command") as send_command:
         result = CliRunner().invoke(main, ["tabs", "move", "12", "-r"])
 
     assert result.exit_code == 0
@@ -384,7 +384,7 @@ def test_tabs_move_accepts_right_short_alias():
 
 
 def test_groups_move_accepts_left_short_alias():
-    with patch("browser_cli.commands.groups.send_command") as send_command:
+    with patch("browser_cli.commands.send_command") as send_command:
         result = CliRunner().invoke(main, ["groups", "move", "research", "-l"])
 
     assert result.exit_code == 0
@@ -399,12 +399,12 @@ def test_windows_list_multi_browser_shows_browser_column():
         return [{"id": 1, "alias": profile, "focused": True, "tabCount": 2, "state": "normal"}]
 
     with patch(
-        "browser_cli.commands.windows.active_browser_targets",
+        "browser_cli.commands.active_browser_targets",
         return_value=[
             BrowserTarget("default", "uuid-1", "/tmp/default.sock"),
             BrowserTarget("work", "work", "/tmp/work.sock"),
         ],
-    ), patch("browser_cli.commands.windows.send_command", side_effect=fake_send_command):
+    ), patch("browser_cli.commands.send_command", side_effect=fake_send_command):
         result = CliRunner().invoke(main, ["windows", "list"])
 
     assert result.exit_code == 0
@@ -420,12 +420,12 @@ def test_session_list_multi_browser_shows_browser_column():
         return [{"name": f"{profile}-session", "tabs": 2, "savedAt": 1712707200000}]
 
     with patch(
-        "browser_cli.commands.session.active_browser_targets",
+        "browser_cli.commands.active_browser_targets",
         return_value=[
             BrowserTarget("default", "uuid-1", "/tmp/default.sock"),
             BrowserTarget("work", "work", "/tmp/work.sock"),
         ],
-    ), patch("browser_cli.commands.session.send_command", side_effect=fake_send_command):
+    ), patch("browser_cli.commands.send_command", side_effect=fake_send_command):
         result = CliRunner().invoke(main, ["session", "list"])
 
     assert result.exit_code == 0
@@ -438,13 +438,13 @@ def test_session_list_multi_browser_shows_browser_column():
 
 def test_session_list_with_explicit_browser_does_not_show_browser_column():
     with patch(
-        "browser_cli.commands.session.active_browser_targets",
+        "browser_cli.commands.active_browser_targets",
         return_value=[
             BrowserTarget("default", "uuid-1", "/tmp/default.sock"),
             BrowserTarget("work", "work", "/tmp/work.sock"),
         ],
     ), patch(
-        "browser_cli.commands.session.send_command",
+        "browser_cli.commands.send_command",
         return_value=[{"name": "work-session", "tabs": 2, "savedAt": 1712707200000}],
     ) as send_command:
         result = CliRunner().invoke(main, ["--browser", "work", "session", "list"])
@@ -455,7 +455,7 @@ def test_session_list_with_explicit_browser_does_not_show_browser_column():
 
 
 def test_windows_open_passes_url():
-    with patch("browser_cli.commands.windows.send_command", return_value={"id": 7}) as send_command:
+    with patch("browser_cli.commands.send_command", return_value={"id": 7}) as send_command:
         result = CliRunner().invoke(main, ["windows", "open", "https://example.com"])
 
     assert result.exit_code == 0
@@ -463,20 +463,20 @@ def test_windows_open_passes_url():
     send_command.assert_called_once_with("windows.open", {"url": "https://example.com"}, profile=None)
 
 def test_extract_markdown_command():
-    with patch("browser_cli.commands.extract.send_command", return_value="# Title") as send_command:
+    with patch("browser_cli.commands.send_command", return_value="# Title") as send_command:
         result = CliRunner().invoke(main, ["extract", "markdown"])
 
     assert result.exit_code == 0
     assert result.output == "# Title\n"
-    send_command.assert_called_once_with("extract.markdown", {"selector": None})
+    send_command.assert_called_once_with("extract.markdown", {"selector": None}, profile=None)
 
 def test_extract_markdown_command_with_selector():
-    with patch("browser_cli.commands.extract.send_command", return_value="## Post") as send_command:
+    with patch("browser_cli.commands.send_command", return_value="## Post") as send_command:
         result = CliRunner().invoke(main, ["extract", "markdown", "--selector", "article"])
 
     assert result.exit_code == 0
     assert result.output == "## Post\n"
-    send_command.assert_called_once_with("extract.markdown", {"selector": "article"})
+    send_command.assert_called_once_with("extract.markdown", {"selector": "article"}, profile=None)
 
 
 def test_clean_markdown_output_removes_escaped_underscores_and_dashes():
@@ -561,7 +561,7 @@ def test_extract_markdown_command_repairs_malformed_tables_and_code_blocks():
         "Golden Set   │   ▼Promptfoo(Testausführung)   │   ▼Plattformen├ Omnifact└ Le Chat\n"
         "```"
     )
-    with patch("browser_cli.commands.extract.send_command", return_value=raw):
+    with patch("browser_cli.commands.send_command", return_value=raw):
         result = CliRunner().invoke(main, ["extract", "markdown"])
 
     assert result.exit_code == 0
@@ -639,8 +639,8 @@ def test_tabs_list_multi_browser_queries_remote_target():
         remote=endpoint,
     )
 
-    with patch("browser_cli.commands.tabs.active_browser_targets", return_value=[remote_target, BrowserTarget("local", "local", "/tmp/local.sock")]), patch(
-        "browser_cli.commands.tabs.send_command",
+    with patch("browser_cli.commands.active_browser_targets", return_value=[remote_target, BrowserTarget("local", "local", "/tmp/local.sock")]), patch(
+        "browser_cli.commands.send_command",
         return_value=[{"id": 1, "windowId": 1, "active": True, "title": "Remote", "url": "https://example.com"}],
     ) as send_command:
         result = CliRunner().invoke(main, ["tabs", "list"])

tests/test_client.py

@@ -6,6 +6,9 @@ import pytest
 from browser_cli.client import (
     BrowserNotConnected,
     BrowserTarget,
+    _looks_like_domain,
+    _normalize_endpoint,
+    _resolve_connect_endpoint,
     _resolve_socket,
     active_browser_targets,
     display_browser_name,
@@ -238,6 +241,120 @@ def test_active_browser_targets_includes_remote_targets(monkeypatch, tmp_path):
     assert targets[0].remote == endpoint
 
 
+def test_looks_like_domain():
+    assert _looks_like_domain("browsercli.yiprawr.dev") is True
+    assert _looks_like_domain("browser-host.example") is True
+    assert _looks_like_domain("sub.domain.org") is True
+    assert _looks_like_domain("localhost") is False
+    assert _looks_like_domain("127.0.0.1") is False
+    assert _looks_like_domain("192.168.1.100") is False
+    assert _looks_like_domain("host") is False  # no dot
+
+
+def test_normalize_endpoint_strips_443_for_domains():
+    assert _normalize_endpoint("browsercli.yiprawr.dev:443") == "browsercli.yiprawr.dev"
+    assert _normalize_endpoint("browsercli.yiprawr.dev") == "browsercli.yiprawr.dev"
+    assert _normalize_endpoint("192.168.1.1:443") == "192.168.1.1:443"  # IP: keep port
+    assert _normalize_endpoint("localhost:443") == "localhost:443"       # localhost: keep port
+    assert _normalize_endpoint("host:8765") == "host:8765"               # non-443 port: unchanged
+    assert _normalize_endpoint("browsercli.yiprawr.dev:8765") == "browsercli.yiprawr.dev:8765"
+
+
+def test_resolve_connect_endpoint_adds_443_for_domain():
+    assert _resolve_connect_endpoint("browsercli.yiprawr.dev") == "browsercli.yiprawr.dev:443"
+    assert _resolve_connect_endpoint("browsercli.yiprawr.dev:443") == "browsercli.yiprawr.dev:443"
+    assert _resolve_connect_endpoint("browsercli.yiprawr.dev:8765") == "browsercli.yiprawr.dev:8765"
+    assert _resolve_connect_endpoint("host:8765") == "host:8765"
+
+
+def test_resolve_connect_endpoint_raises_for_bare_non_domain():
+    with pytest.raises(BrowserNotConnected, match="expected host:port"):
+        _resolve_connect_endpoint("localhost")
+
+
+def test_send_command_normalizes_domain_port_443(monkeypatch):
+    """--remote domain:443 is normalized; _send_remote gets the portless domain."""
+    monkeypatch.delenv("BROWSER_CLI_PROFILE", raising=False)
+    monkeypatch.delenv("BROWSER_CLI_REMOTE", raising=False)
+    sent_to = {}
+
+    monkeypatch.setattr(
+        "browser_cli.client.remote_browser_targets",
+        lambda endpoint, key=None: [BrowserTarget("default", f"{endpoint}:default", "", remote=endpoint)],
+    )
+
+    def fake_send_remote(endpoint, msg, private_key=None):
+        sent_to["endpoint"] = endpoint
+        return json.dumps({"success": True, "data": "ok"}).encode()
+
+    monkeypatch.setattr("browser_cli.client._send_remote", fake_send_remote)
+
+    result = send_command("tabs.list", remote="browsercli.yiprawr.dev:443")
+    assert result == "ok"
+    assert sent_to["endpoint"] == "browsercli.yiprawr.dev"  # stored/routed without port
+
+
+def test_send_command_domain_without_port_defaults_to_443(monkeypatch):
+    """--remote domain (no port) is treated as :443."""
+    monkeypatch.delenv("BROWSER_CLI_PROFILE", raising=False)
+    monkeypatch.delenv("BROWSER_CLI_REMOTE", raising=False)
+    sent_to = {}
+
+    monkeypatch.setattr(
+        "browser_cli.client.remote_browser_targets",
+        lambda endpoint, key=None: [BrowserTarget("default", f"{endpoint}:default", "", remote=endpoint)],
+    )
+
+    def fake_send_remote(endpoint, msg, private_key=None):
+        sent_to["endpoint"] = endpoint
+        return json.dumps({"success": True, "data": "ok"}).encode()
+
+    monkeypatch.setattr("browser_cli.client._send_remote", fake_send_remote)
+
+    result = send_command("tabs.list", remote="browsercli.yiprawr.dev")
+    assert result == "ok"
+    assert sent_to["endpoint"] == "browsercli.yiprawr.dev"
+
+
+def test_domain_display_name_omits_port(monkeypatch, tmp_path):
+    """Domain endpoints stored without :443 display as 'domain:profile', not 'domain:443:profile'."""
+    remotes_path = tmp_path / "remotes.json"
+    endpoint = "browsercli.yiprawr.dev"
+    remotes_path.write_text(json.dumps({endpoint: {}}), encoding="utf-8")
+    monkeypatch.setattr("browser_cli.client.REGISTRY_PATH", tmp_path / "missing-registry.json")
+    monkeypatch.setattr("browser_cli.client.REMOTE_REGISTRY_PATH", remotes_path)
+
+    def fake_send_command(command, args=None, profile=None, remote=None, key=None):
+        return [{"profile": "automatisation", "displayName": "automatisation"}]
+
+    monkeypatch.setattr("browser_cli.client.send_command", fake_send_command)
+
+    targets = active_browser_targets()
+
+    assert len(targets) == 1
+    assert targets[0].display_name == "browsercli.yiprawr.dev:automatisation"
+    assert targets[0].remote == endpoint
+
+
+def test_domain_display_name_backward_compat_with_stored_443(monkeypatch, tmp_path):
+    """Old remotes.json with :443 still displays cleanly without the port."""
+    remotes_path = tmp_path / "remotes.json"
+    endpoint = "browsercli.yiprawr.dev:443"  # old format
+    remotes_path.write_text(json.dumps({endpoint: {}}), encoding="utf-8")
+    monkeypatch.setattr("browser_cli.client.REGISTRY_PATH", tmp_path / "missing-registry.json")
+    monkeypatch.setattr("browser_cli.client.REMOTE_REGISTRY_PATH", remotes_path)
+
+    def fake_send_command(command, args=None, profile=None, remote=None, key=None):
+        return [{"profile": "automatisation", "displayName": "automatisation"}]
+
+    monkeypatch.setattr("browser_cli.client.send_command", fake_send_command)
+
+    targets = active_browser_targets()
+
+    assert len(targets) == 1
+    assert targets[0].display_name == "browsercli.yiprawr.dev:automatisation"
+
+
 def test_send_command_auto_saves_and_reuses_key_for_remote(monkeypatch, tmp_path):
     """--key agent is saved on first use; omitting --key on subsequent calls reuses it."""
     import json as _json

tests/test_extension_error_page_handling.py

@@ -0,0 +1,37 @@
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+
+def test_extension_retries_error_page_script_injection_before_failing():
+    core = (ROOT / "extension" / "src" / "core.ts").read_text()
+
+    assert "isBrowserErrorUrl" in core
+    assert "isErrorPageScriptError" in core
+    assert "chrome-error://" in core
+    assert "edge-error://" in core
+    assert "brave-error://" in core
+    assert "about:neterror" in core
+    assert "about:certerror" in core
+    assert "isTransientScriptError(e)" in core
+
+def test_read_only_dom_commands_have_error_page_fallbacks():
+    dom = (ROOT / "extension" / "src" / "commands" / "dom.ts").read_text()
+
+    assert "fallbackForErrorPageDomOp" in dom
+    assert 'case "domExists":' in dom
+    assert "return false;" in dom
+    assert 'case "domQuery":' in dom
+    assert 'case "extractText":' in dom
+    assert "isBrowserErrorUrl(tabUrl)" in dom
+    assert "isErrorPageScriptError(e)" in dom
+
+def test_navigation_and_tabs_report_browser_error_pages():
+    tabs = (ROOT / "extension" / "src" / "commands" / "tabs.ts").read_text()
+    navigation = (ROOT / "extension" / "src" / "commands" / "navigation.ts").read_text()
+
+    assert "lastUrl" in tabs
+    assert "lastStatus" in tabs
+    assert "showing an error page" in tabs
+    assert "last URL:" in tabs
+    assert "isBrowserErrorUrl" in navigation
+    assert "showing an error page while waiting for load" in navigation

tests/test_remote_protocol_matrix.py

@@ -0,0 +1,213 @@
+"""Remote protocol compatibility matrix for post-quantum transport.
+
+These tests exercise the wire-level combinations that matter for mixed
+browser-cli versions without requiring a real browser. The native-host lookup is
+mocked so successful auth/transport reaches the proxy layer and then returns the
+expected "browser not connected" error.
+"""
+import contextlib
+import io
+import json
+import os
+import socket
+import struct
+import threading
+
+import pytest
+
+from browser_cli.auth import (
+    generate_keypair,
+    load_private_key,
+    pq_decrypt,
+    pq_encrypt,
+    pq_kex_client_encapsulate,
+    pq_kex_server_decapsulate,
+    pq_kex_server_keypair,
+    sign,
+)
+from browser_cli.client import BrowserNotConnected, send_command
+from browser_cli.commands.serve import _handle_client
+
+def _send_framed(sock: socket.socket, msg: dict) -> None:
+    payload = json.dumps(msg).encode("utf-8")
+    sock.sendall(struct.pack("<I", len(payload)) + payload)
+
+def _recv_framed(sock: socket.socket) -> dict:
+    raw_len = b""
+    while len(raw_len) < 4:
+        chunk = sock.recv(4 - len(raw_len))
+        if not chunk:
+            raise ConnectionError("socket closed before response header")
+        raw_len += chunk
+    msg_len = struct.unpack("<I", raw_len)[0]
+    data = b""
+    while len(data) < msg_len:
+        chunk = sock.recv(msg_len - len(data))
+        if not chunk:
+            raise ConnectionError("socket closed mid-response")
+        data += chunk
+    return json.loads(data)
+
+@pytest.fixture()
+def auth_material(tmp_path):
+    pem, pub = generate_keypair()
+    key_path = tmp_path / "client.key.pem"
+    key_path.write_bytes(pem)
+    auth_path = tmp_path / "authorized_keys"
+    auth_path.write_text(pub + "\n", encoding="utf-8")
+    return key_path, auth_path, load_private_key(key_path), pub
+
+@pytest.fixture(autouse=True)
+def no_browser(monkeypatch):
+    def _raise_no_browser(*_args, **_kwargs):
+        raise BrowserNotConnected("no browser")
+
+    monkeypatch.setattr("browser_cli.client._resolve_socket", _raise_no_browser)
+
+def _connect(auth_keys_path):
+    client, server = socket.socketpair()
+    thread = threading.Thread(
+        target=_handle_client,
+        args=(server, ("127.0.0.1", 9999), None, auth_keys_path),
+        daemon=True,
+    )
+    thread.start()
+    challenge = _recv_framed(client)
+    return client, thread, challenge
+
+def _pq_auth_message(priv, pub: str, nonce_hex: str, command_msg: dict, challenge: dict, *, encrypted: bool) -> tuple[dict, bytes]:
+    if "pq_kex" not in challenge:
+        pytest.skip("ML-KEM backend not available")
+
+    ciphertext_hex, shared_secret = pq_kex_client_encapsulate(challenge["pq_kex"]["public_key"])
+    clean_msg = {
+        **command_msg,
+        "pq_kex": {"alg": "ML-KEM-768", "ciphertext": ciphertext_hex},
+    }
+    sig = sign(priv, bytes.fromhex(nonce_hex), clean_msg, shared_secret).hex()
+    if not encrypted:
+        return {**clean_msg, "pubkey": pub, "sig": sig}, shared_secret
+
+    envelope = {
+        "id": clean_msg["id"],
+        "user_agent": clean_msg["user_agent"],
+        "pubkey": pub,
+        "sig": sig,
+        "pq_kex": clean_msg["pq_kex"],
+        "encrypted": pq_encrypt(shared_secret, "request", json.dumps(clean_msg).encode("utf-8")),
+    }
+    return envelope, shared_secret
+
+def _assert_browser_not_connected(resp: dict) -> None:
+    assert resp.get("success") is False
+    assert "browser" in resp.get("error", "").lower() or "connected" in resp.get("error", "").lower()
+
+def test_real_mlkem_primitive_roundtrip():
+    keypair = pq_kex_server_keypair()
+    if keypair is None:
+        pytest.skip("ML-KEM backend not available")
+    private_key, public_key = keypair
+
+    ciphertext_hex, client_secret = pq_kex_client_encapsulate(public_key.hex())
+    server_secret = pq_kex_server_decapsulate(private_key, ciphertext_hex)
+
+    assert server_secret == client_secret
+
+@pytest.mark.parametrize(
+    ("client_version", "encrypted", "expect_encrypted_response"),
+    [
+        ("0.9.3", False, False),  # legacy client stays compatible
+        ("0.9.5", True, True),    # current client must use encrypted transport
+    ],
+)
+def test_remote_protocol_version_matrix(auth_material, client_version, encrypted, expect_encrypted_response):
+    selected_version = os.environ.get("BROWSER_CLI_COMPAT_CLIENT_VERSION")
+    if selected_version and selected_version != client_version:
+        pytest.skip(f"compat matrix selected {selected_version}")
+
+    _key_path, auth_path, priv, pub = auth_material
+    client, thread, challenge = _connect(auth_path)
+
+    msg = {
+        "id": f"tabs-{client_version}",
+        "command": "tabs.list",
+        "args": {},
+        "user_agent": f"browser-cli/{client_version}",
+    }
+    wire_msg, shared_secret = _pq_auth_message(priv, pub, challenge["nonce"], msg, challenge, encrypted=encrypted)
+    _send_framed(client, wire_msg)
+    resp = _recv_framed(client)
+
+    if expect_encrypted_response:
+        assert set(resp) == {"encrypted"}
+        resp = json.loads(pq_decrypt(shared_secret, "response", resp["encrypted"]))
+    else:
+        assert "encrypted" not in resp
+
+    _assert_browser_not_connected(resp)
+    client.close()
+    thread.join(timeout=2)
+
+def test_current_client_plaintext_transport_is_rejected(auth_material):
+    _key_path, auth_path, priv, pub = auth_material
+    client, thread, challenge = _connect(auth_path)
+
+    msg = {
+        "id": "new-plain",
+        "command": "tabs.list",
+        "args": {},
+        "user_agent": "browser-cli/0.9.5",
+    }
+    wire_msg, _shared_secret = _pq_auth_message(priv, pub, challenge["nonce"], msg, challenge, encrypted=False)
+    _send_framed(client, wire_msg)
+    resp = _recv_framed(client)
+
+    assert resp.get("success") is False
+    assert "encrypted transport" in resp.get("error", "").lower()
+    client.close()
+    thread.join(timeout=2)
+
+def test_send_command_uses_encrypted_remote_transport(auth_material):
+    key_path, auth_path, _priv, _pub = auth_material
+    server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    server.bind(("127.0.0.1", 0))
+    server.listen(1)
+    host, port = server.getsockname()
+
+    def _accept_once():
+        conn, addr = server.accept()
+        _handle_client(conn, addr, None, auth_path)
+        server.close()
+
+    thread = threading.Thread(target=_accept_once, daemon=True)
+    thread.start()
+
+    with pytest.raises(RuntimeError, match="browser|connected"):
+        send_command("tabs.list", remote=f"{host}:{port}", profile="default", key=key_path)
+
+    thread.join(timeout=2)
+
+def test_no_mlkem_backend_falls_back_and_client_warns(auth_material, monkeypatch):
+    key_path, auth_path, _priv, _pub = auth_material
+    monkeypatch.setattr("browser_cli.auth.pq_kex_server_keypair", lambda: None)
+
+    server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    server.bind(("127.0.0.1", 0))
+    server.listen(1)
+    host, port = server.getsockname()
+
+    def _accept_once():
+        conn, addr = server.accept()
+        _handle_client(conn, addr, None, auth_path)
+        server.close()
+
+    thread = threading.Thread(target=_accept_once, daemon=True)
+    thread.start()
+
+    stderr = io.StringIO()
+    with contextlib.redirect_stderr(stderr):
+        with pytest.raises(RuntimeError, match="browser|connected"):
+            send_command("tabs.list", remote=f"{host}:{port}", profile="default", key=key_path)
+
+    assert "not using a post-quantum key exchange" in stderr.getvalue()
+    thread.join(timeout=2)

tests/test_serve.py

@@ -0,0 +1,373 @@
+"""Unit tests for the TCP serve layer (challenge-response auth, framing, rejection paths)."""
+import json
+import socket
+import struct
+import threading
+
+import pytest
+
+from browser_cli.auth import generate_keypair, load_private_key, new_nonce, pq_decrypt, pq_encrypt, sign
+from browser_cli.client import BrowserNotConnected
+from browser_cli.commands.serve import _handle_client
+
+FAKE_UA = "browser-cli/0.9.3"
+
+
+# ── helpers ────────────────────────────────────────────────────────────────────
+
+def _send_framed(sock: socket.socket, data: bytes) -> None:
+    sock.sendall(struct.pack("<I", len(data)) + data)
+
+
+def _recv_framed(sock: socket.socket) -> dict:
+    raw = b""
+    while len(raw) < 4:
+        chunk = sock.recv(4 - len(raw))
+        if not chunk:
+            raise ConnectionError("socket closed before response header")
+        raw += chunk
+    n = struct.unpack("<I", raw)[0]
+    data = b""
+    while len(data) < n:
+        chunk = sock.recv(n - len(data))
+        if not chunk:
+            raise ConnectionError("socket closed mid-response")
+        data += chunk
+    return json.loads(data)
+
+
+def _spawn(server_sock: socket.socket, auth_keys_path) -> threading.Thread:
+    t = threading.Thread(
+        target=_handle_client,
+        args=(server_sock, ("127.0.0.1", 9999), None, auth_keys_path),
+        daemon=True,
+    )
+    t.start()
+    return t
+
+
+def _pair():
+    return socket.socketpair()
+
+
+def _mock_no_browser(*_args, **_kwargs):
+    raise BrowserNotConnected("no browser")
+
+
+# ── challenge frame ────────────────────────────────────────────────────────────
+
+class TestChallenge:
+    def test_challenge_sent_on_connect(self):
+        client, server = _pair()
+        t = _spawn(server, None)
+        challenge = _recv_framed(client)
+        assert challenge["type"] == "challenge"
+        assert "nonce" in challenge
+        client.close()
+        t.join(timeout=2)
+
+    def test_challenge_includes_version_fields(self):
+        client, server = _pair()
+        t = _spawn(server, None)
+        challenge = _recv_framed(client)
+        assert "server_version" in challenge
+        assert "min_client_version" in challenge
+        client.close()
+        t.join(timeout=2)
+
+    def test_challenge_advertises_post_quantum_kex_when_available(self, tmp_path, monkeypatch):
+        monkeypatch.setattr("browser_cli.auth.pq_kex_server_keypair", lambda: ("fake-private", b"fake-public"))
+        path = tmp_path / "authorized_keys"
+        _, pub = generate_keypair()
+        path.write_text(pub + "\n")
+
+        client, server = _pair()
+        t = _spawn(server, path)
+        challenge = _recv_framed(client)
+
+        assert challenge["pq_kex"] == {"alg": "ML-KEM-768", "public_key": b"fake-public".hex()}
+        client.close()
+        t.join(timeout=2)
+
+
+# ── rejection paths ────────────────────────────────────────────────────────────
+
+class TestRejection:
+    def _connect(self, auth_keys_path):
+        client, server = _pair()
+        t = _spawn(server, auth_keys_path)
+        challenge = _recv_framed(client)
+        return client, t, challenge
+
+    def test_bad_user_agent_rejected(self):
+        client, t, _ = self._connect(None)
+        msg = {"id": "x", "command": "tabs.list", "args": {}, "user_agent": "curl/7.88"}
+        _send_framed(client, json.dumps(msg).encode())
+        resp = _recv_framed(client)
+        assert resp["success"] is False
+        assert "forbidden" in resp["error"].lower() or "client" in resp["error"].lower()
+        client.close()
+        t.join(timeout=2)
+
+    def test_missing_pubkey_sig_rejected(self, tmp_path):
+        path = tmp_path / "authorized_keys"
+        _, pub = generate_keypair()
+        path.write_text(pub + "\n")
+        client, t, _ = self._connect(path)
+        msg = {"id": "x", "command": "tabs.list", "args": {}, "user_agent": FAKE_UA}
+        _send_framed(client, json.dumps(msg).encode())
+        resp = _recv_framed(client)
+        assert resp["success"] is False
+        assert "unauthorized" in resp["error"].lower()
+        client.close()
+        t.join(timeout=2)
+
+    def test_untrusted_pubkey_rejected(self, tmp_path):
+        path = tmp_path / "authorized_keys"
+        _, trusted_pub = generate_keypair()
+        path.write_text(trusted_pub + "\n")
+
+        pem, untrusted_pub = generate_keypair()
+        key_path = tmp_path / "other.pem"
+        key_path.write_bytes(pem)
+        priv = load_private_key(key_path)
+
+        client, t, challenge = self._connect(path)
+        nonce = bytes.fromhex(challenge["nonce"])
+        msg = {"id": "x", "command": "tabs.list", "args": {}, "user_agent": FAKE_UA, "pubkey": untrusted_pub}
+        msg["sig"] = sign(priv, nonce, msg).hex()
+        _send_framed(client, json.dumps(msg).encode())
+        resp = _recv_framed(client)
+        assert resp["success"] is False
+        assert "untrusted" in resp["error"].lower()
+        client.close()
+        t.join(timeout=2)
+
+    def test_bad_signature_rejected(self, tmp_path):
+        path = tmp_path / "authorized_keys"
+        _, pub = generate_keypair()
+        path.write_text(pub + "\n")
+        client, t, _ = self._connect(path)
+        msg = {"id": "x", "command": "tabs.list", "args": {}, "user_agent": FAKE_UA, "pubkey": pub, "sig": "00" * 64}
+        _send_framed(client, json.dumps(msg).encode())
+        resp = _recv_framed(client)
+        assert resp["success"] is False
+        assert "signature" in resp["error"].lower() or "invalid" in resp["error"].lower()
+        client.close()
+        t.join(timeout=2)
+
+    def test_missing_post_quantum_kex_rejected_when_required(self, tmp_path, monkeypatch):
+        monkeypatch.setattr("browser_cli.auth.pq_kex_server_keypair", lambda: ("fake-private", b"fake-public"))
+        path = tmp_path / "authorized_keys"
+        pem, pub = generate_keypair()
+        path.write_text(pub + "\n")
+        priv_path = tmp_path / "client.pem"
+        priv_path.write_bytes(pem)
+        priv = load_private_key(priv_path)
+
+        client, t, challenge = self._connect(path)
+        nonce = bytes.fromhex(challenge["nonce"])
+        msg = {"id": "x", "command": "tabs.list", "args": {}, "user_agent": "browser-cli/0.9.5", "pubkey": pub}
+        msg["sig"] = sign(priv, nonce, msg).hex()
+        _send_framed(client, json.dumps(msg).encode())
+        resp = _recv_framed(client)
+
+        assert resp["success"] is False
+        assert "post-quantum" in resp["error"].lower()
+        client.close()
+        t.join(timeout=2)
+
+    def test_oversized_message_rejected(self):
+        client, server = _pair()
+        t = _spawn(server, None)
+        _recv_framed(client)  # consume challenge
+        client.sendall(struct.pack("<I", 33 * 1024 * 1024))
+        resp = _recv_framed(client)
+        assert resp["success"] is False
+        assert "too large" in resp["error"].lower()
+        client.close()
+        t.join(timeout=2)
+
+    def test_invalid_json_rejected(self):
+        client, server = _pair()
+        t = _spawn(server, None)
+        _recv_framed(client)  # consume challenge
+        bad = b"this is not json {"
+        _send_framed(client, bad)
+        resp = _recv_framed(client)
+        assert resp["success"] is False
+        client.close()
+        t.join(timeout=2)
+
+
+# ── auth success paths ─────────────────────────────────────────────────────────
+
+class TestAuthSuccess:
+    def test_valid_auth_reaches_proxy(self, tmp_path, monkeypatch):
+        """Correct signature → error must be 'browser not connected', not 'unauthorized'."""
+        path = tmp_path / "authorized_keys"
+        pem, pub = generate_keypair()
+        path.write_text(pub + "\n")
+        key_path = tmp_path / "client.key.pem"
+        key_path.write_bytes(pem)
+        priv = load_private_key(key_path)
+
+        monkeypatch.setattr("browser_cli.client._resolve_socket", _mock_no_browser)
+
+        client, server = _pair()
+        t = threading.Thread(
+            target=_handle_client,
+            args=(server, ("127.0.0.1", 9999), None, path),
+            daemon=True,
+        )
+        t.start()
+
+        challenge = _recv_framed(client)
+        nonce = bytes.fromhex(challenge["nonce"])
+        msg = {"id": "x", "command": "tabs.list", "args": {}, "user_agent": FAKE_UA, "pubkey": pub}
+        msg["sig"] = sign(priv, nonce, msg).hex()
+        _send_framed(client, json.dumps(msg).encode())
+        resp = _recv_framed(client)
+
+        assert resp["success"] is False
+        assert "unauthorized" not in resp["error"].lower()
+        assert "browser" in resp["error"].lower() or "connected" in resp["error"].lower()
+        client.close()
+        t.join(timeout=2)
+
+    def test_uppercase_pubkey_normalized_by_compat(self, tmp_path, monkeypatch):
+        """Clients < 0.9.3 may send uppercase pubkeys; compat layer normalises before auth."""
+        path = tmp_path / "authorized_keys"
+        pem, pub = generate_keypair()  # pub is lowercase hex
+        path.write_text(pub + "\n")
+        key_path = tmp_path / "client.key.pem"
+        key_path.write_bytes(pem)
+        priv = load_private_key(key_path)
+
+        monkeypatch.setattr("browser_cli.client._resolve_socket", _mock_no_browser)
+
+        client, server = _pair()
+        t = _spawn(server, path)
+
+        challenge = _recv_framed(client)
+        nonce = bytes.fromhex(challenge["nonce"])
+        # old client sends uppercase pubkey
+        msg = {"id": "x", "command": "tabs.list", "args": {}, "user_agent": "browser-cli/0.9.2", "pubkey": pub.upper()}
+        msg["sig"] = sign(priv, nonce, msg).hex()
+        _send_framed(client, json.dumps(msg).encode())
+        resp = _recv_framed(client)
+
+        assert "unauthorized" not in resp.get("error", "").lower()
+        assert "browser" in resp.get("error", "").lower() or "connected" in resp.get("error", "").lower()
+        client.close()
+        t.join(timeout=2)
+
+    def test_post_quantum_kex_auth_reaches_proxy(self, tmp_path, monkeypatch):
+        """ML-KEM shared secret is decapsulated and bound to the auth signature."""
+        monkeypatch.setattr("browser_cli.client._resolve_socket", _mock_no_browser)
+        monkeypatch.setattr("browser_cli.auth.pq_kex_server_keypair", lambda: ("fake-private", b"fake-public"))
+        monkeypatch.setattr("browser_cli.auth.pq_kex_server_decapsulate", lambda priv, ct: b"pq-secret")
+
+        path = tmp_path / "authorized_keys"
+        pem, pub = generate_keypair()
+        path.write_text(pub + "\n")
+        key_path = tmp_path / "client.key.pem"
+        key_path.write_bytes(pem)
+        priv = load_private_key(key_path)
+
+        client, server = _pair()
+        t = threading.Thread(
+            target=_handle_client,
+            args=(server, ("127.0.0.1", 9999), None, path),
+            daemon=True,
+        )
+        t.start()
+
+        challenge = _recv_framed(client)
+        nonce = bytes.fromhex(challenge["nonce"])
+        msg = {
+            "id": "x",
+            "command": "tabs.list",
+            "args": {},
+            "user_agent": FAKE_UA,
+            "pubkey": pub,
+            "pq_kex": {"alg": "ML-KEM-768", "ciphertext": "cafe"},
+        }
+        msg["sig"] = sign(priv, nonce, msg, b"pq-secret").hex()
+        _send_framed(client, json.dumps(msg).encode())
+        resp = _recv_framed(client)
+
+        assert "unauthorized" not in resp.get("error", "").lower()
+        assert "browser" in resp.get("error", "").lower() or "connected" in resp.get("error", "").lower()
+        client.close()
+        t.join(timeout=2)
+
+    def test_post_quantum_encrypted_transport_reaches_proxy(self, tmp_path, monkeypatch):
+        """New clients encrypt the command payload and receive encrypted responses."""
+        monkeypatch.setattr("browser_cli.client._resolve_socket", _mock_no_browser)
+        monkeypatch.setattr("browser_cli.auth.pq_kex_server_keypair", lambda: ("fake-private", b"fake-public"))
+        monkeypatch.setattr("browser_cli.auth.pq_kex_server_decapsulate", lambda priv, ct: b"pq-secret")
+
+        path = tmp_path / "authorized_keys"
+        pem, pub = generate_keypair()
+        path.write_text(pub + "\n")
+        key_path = tmp_path / "client.key.pem"
+        key_path.write_bytes(pem)
+        priv = load_private_key(key_path)
+
+        client, server = _pair()
+        t = threading.Thread(
+            target=_handle_client,
+            args=(server, ("127.0.0.1", 9999), None, path),
+            daemon=True,
+        )
+        t.start()
+
+        challenge = _recv_framed(client)
+        nonce = bytes.fromhex(challenge["nonce"])
+        clean_msg = {
+            "id": "x",
+            "command": "tabs.list",
+            "args": {},
+            "user_agent": "browser-cli/0.9.5",
+            "pq_kex": {"alg": "ML-KEM-768", "ciphertext": "cafe"},
+        }
+        sig = sign(priv, nonce, clean_msg, b"pq-secret").hex()
+        envelope = {
+            "id": "x",
+            "user_agent": "browser-cli/0.9.5",
+            "pubkey": pub,
+            "sig": sig,
+            "pq_kex": clean_msg["pq_kex"],
+            "encrypted": pq_encrypt(b"pq-secret", "request", json.dumps(clean_msg).encode()),
+        }
+        _send_framed(client, json.dumps(envelope).encode())
+        encrypted_resp = _recv_framed(client)
+
+        assert "encrypted" in encrypted_resp
+        resp = json.loads(pq_decrypt(b"pq-secret", "response", encrypted_resp["encrypted"]))
+        assert "unauthorized" not in resp.get("error", "").lower()
+        assert "browser" in resp.get("error", "").lower() or "connected" in resp.get("error", "").lower()
+        client.close()
+        t.join(timeout=2)
+
+    def test_no_auth_mode_reaches_proxy(self, monkeypatch):
+        """auth_keys_path=None (--no-auth): no pubkey required, reaches proxy layer."""
+        monkeypatch.setattr("browser_cli.client._resolve_socket", _mock_no_browser)
+
+        client, server = _pair()
+        t = threading.Thread(
+            target=_handle_client,
+            args=(server, ("127.0.0.1", 9999), None, None),
+            daemon=True,
+        )
+        t.start()
+
+        _recv_framed(client)  # challenge
+        msg = {"id": "x", "command": "tabs.list", "args": {}, "user_agent": FAKE_UA}
+        _send_framed(client, json.dumps(msg).encode())
+        resp = _recv_framed(client)
+
+        assert "unauthorized" not in resp.get("error", "").lower()
+        client.close()
+        t.join(timeout=2)

uv.lock

@@ -4,7 +4,7 @@ requires-python = ">=3.10"
 
 [[package]]
 name = "browser-cli"
-version = "0.9.2"
+version = "0.9.8"
 source = { editable = "." }
 dependencies = [
     { name = "click" },
@@ -20,7 +20,7 @@ dev = [
 [package.metadata]
 requires-dist = [
     { name = "click", specifier = ">=8" },
-    { name = "cryptography", specifier = ">=42" },
+    { name = "cryptography", specifier = ">=48" },
     { name = "rich", specifier = ">=13" },
 ]
 
@@ -132,62 +132,62 @@ wheels = [
 
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+version = "48.0.0"
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     { name = "typing-extensions", marker = "python_full_version < '3.11'" },
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