fix(gluetun): stop leaking proxy/vpn secrets to process list

- Switch docker run to use a temporary --env-file instead of per-var -e flags\n- Ensure temp env file is always removed (best-effort overwrite + unlink)\n- Tighten _is_container_running to exact-name matching via anchored docker filter\n- Close requests.Session used for IP verification to release connections\n- Redact more secret-like env keys in debug logs\n

unshackle/core/proxies/gluetun.py

@@ -2,7 +2,9 @@ import atexit
 import logging
 import os
 import re
+import stat
 import subprocess
+import tempfile
 import threading
 import time
 from typing import Optional
@@ -750,7 +752,8 @@ class Gluetun(Proxy):
 
         # Debug log environment variables (redact sensitive values)
         if debug_logger:
-            safe_env = {k: ("***" if "KEY" in k or "PASSWORD" in k else v) for k, v in env_vars.items()}
+            redact_markers = ("KEY", "PASSWORD", "PASS", "TOKEN", "SECRET", "USER")
+            safe_env = {k: ("***" if any(m in k for m in redact_markers) else v) for k, v in env_vars.items()}
             debug_logger.log(
                 level="DEBUG",
                 operation="gluetun_env_vars",
@@ -771,12 +774,40 @@ class Gluetun(Proxy):
             f"127.0.0.1:{port}:8888/tcp",
         ]
 
-        # Add environment variables
+        # Avoid exposing credentials in process listings by using --env-file instead of many "-e KEY=VALUE".
+        env_file_path: str | None = None
+        try:
+            fd, env_file_path = tempfile.mkstemp(prefix=f"unshackle-{container_name}-", suffix=".env")
+            try:
+                # Best-effort restrictive permissions.
+                if os.name != "nt":
+                    if hasattr(os, "fchmod"):
+                        os.fchmod(fd, 0o600)
+                    else:
+                        os.chmod(env_file_path, 0o600)
+                else:
+                    os.chmod(env_file_path, stat.S_IREAD | stat.S_IWRITE)
+
+                with os.fdopen(fd, "w", encoding="utf-8", newline="\n") as f:
                     for key, value in env_vars.items():
-            cmd.extend(["-e", f"{key}={value}"])
+                        if "=" in key:
+                            raise ValueError(f"Invalid env var name for docker env-file: {key!r}")
+                        v = "" if value is None else str(value)
+                        if "\n" in v or "\r" in v:
+                            raise ValueError(f"Invalid env var value (contains newline) for {key!r}")
+                        f.write(f"{key}={v}\n")
+            except Exception:
+                # If we fail before fdopen closes the descriptor, make sure it's not leaked.
+                try:
+                    os.close(fd)
+                except Exception:
+                    pass
+                raise
+
+            cmd.extend(["--env-file", env_file_path])
 
             # Add Gluetun image
-        cmd.append("qmcgaw/gluetun:latest")
+            cmd.append(gluetun_image)
 
             # Execute docker run
             try:
@@ -788,6 +819,17 @@ class Gluetun(Proxy):
                     encoding="utf-8",
                     errors="replace",
                 )
+            except subprocess.TimeoutExpired:
+                if debug_logger:
+                    debug_logger.log(
+                        level="ERROR",
+                        operation="gluetun_container_create_timeout",
+                        message=f"Docker run timed out for {container_name}",
+                        context={"container_name": container_name},
+                        success=False,
+                        duration_ms=(time.time() - start_time) * 1000,
+                    )
+                raise RuntimeError("Docker run command timed out")
 
             if result.returncode != 0:
                 error_msg = result.stderr or "unknown error"
@@ -826,29 +868,51 @@ class Gluetun(Proxy):
                     success=True,
                     duration_ms=duration_ms,
                 )
-
-        except subprocess.TimeoutExpired:
-            if debug_logger:
-                debug_logger.log(
-                    level="ERROR",
-                    operation="gluetun_container_create_timeout",
-                    message=f"Docker run timed out for {container_name}",
-                    context={"container_name": container_name},
-                    success=False,
-                    duration_ms=(time.time() - start_time) * 1000,
-                )
-            raise RuntimeError("Docker run command timed out")
+        finally:
+            if env_file_path:
+                # Best-effort "secure delete": overwrite then unlink (not guaranteed on all filesystems).
+                try:
+                    with open(env_file_path, "r+b") as f:
+                        try:
+                            f.seek(0, os.SEEK_END)
+                            length = f.tell()
+                            f.seek(0)
+                            if length > 0:
+                                f.write(b"\x00" * length)
+                                f.flush()
+                                os.fsync(f.fileno())
+                        except Exception:
+                            pass
+                except Exception:
+                    pass
+                try:
+                    os.remove(env_file_path)
+                except FileNotFoundError:
+                    pass
+                except Exception:
+                    pass
 
     def _is_container_running(self, container_name: str) -> bool:
         """Check if a Docker container is running."""
         try:
             result = subprocess.run(
-                ["docker", "ps", "--filter", f"name={container_name}", "--format", "{{.Names}}"],
+                [
+                    "docker",
+                    "ps",
+                    "--filter",
+                    f"name=^{re.escape(container_name)}$",
+                    "--format",
+                    "{{.Names}}",
+                ],
                 capture_output=True,
                 text=True,
                 timeout=5,
             )
-            return result.returncode == 0 and container_name in result.stdout
+            if result.returncode != 0:
+                return False
+
+            names = [line.strip() for line in (result.stdout or "").splitlines() if line.strip()]
+            return any(name == container_name for name in names)
         except (subprocess.TimeoutExpired, FileNotFoundError):
             return False
 
@@ -1132,6 +1196,7 @@ class Gluetun(Proxy):
 
         # Create a session with the proxy configured
         session = requests.Session()
+        try:
             session.proxies = {"http": proxy_url, "https": proxy_url}
 
             # Retry with exponential backoff
@@ -1224,6 +1289,11 @@ class Gluetun(Proxy):
                 if attempt < max_retries - 1:
                     wait_time = 2**attempt  # 1, 2, 4 seconds
                     time.sleep(wait_time)
+        finally:
+            try:
+                session.close()
+            except Exception:
+                pass
 
         # All retries exhausted
         duration_ms = (time.time() - start_time) * 1000