Add token refresher daemon

Author: gouriphadnis0301

refresh_token_daemon.py

@@ -0,0 +1,172 @@
+#!/usr/bin/env python3
+"""
+refresh_token_daemon.py
+
+Periodically fetch an auth token and write to a file (used by sqlmap --eval).
+Configure via env vars or edit the defaults below.
+"""
+
+import os
+import sys
+import time
+import json
+import tempfile
+import traceback
+from datetime import datetime
+from typing import Optional
+
+import requests
+
+# === CONFIG (edit here or set env vars) ===
+AUTH_URL = os.getenv("AUTH_URL", "https://target.example.com/auth")
+AUTH_BODY_JSON = os.getenv("AUTH_BODY_JSON")  # example: '{"username":"me","password":"pwd"}'
+if AUTH_BODY_JSON is None:
+    AUTH_BODY = {"username": "youruser", "password": "yourpass"}
+else:
+    try:
+        AUTH_BODY = json.loads(AUTH_BODY_JSON)
+    except Exception:
+        print("ERROR: AUTH_BODY_JSON not valid JSON", file=sys.stderr)
+        AUTH_BODY = {}
+
+DEFAULT_OUT_UNIX = "/tmp/current_token.txt"
+DEFAULT_OUT_WIN = r"C:\temp\current_token.txt"
+TOKEN_OUT = os.getenv("TOKEN_OUT", DEFAULT_OUT_UNIX if os.name != "nt" else DEFAULT_OUT_WIN)
+
+TOKEN_JSON_KEY = os.getenv("TOKEN_JSON_KEY", "access_token")  # set to "" to use raw body
+REFRESH_TTL = int(os.getenv("REFRESH_TTL", "50"))     # seconds token considered fresh
+REFRESH_FREQ = int(os.getenv("REFRESH_FREQ", "10"))   # daemon wake frequency (s)
+
+REQUEST_TIMEOUT = int(os.getenv("REQUEST_TIMEOUT", "15"))
+MAX_RETRIES = int(os.getenv("MAX_RETRIES", "3"))
+RETRY_BACKOFF = float(os.getenv("RETRY_BACKOFF", "2.0"))
+
+def log(msg: str, err: bool = False):
+    ts = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
+    out = sys.stderr if err else sys.stdout
+    print(f"[{ts}] {msg}", file=out)
+    out.flush()
+
+# Cross-platform file lock
+if os.name == "nt":
+    import msvcrt
+    class FileLock:
+        def __init__(self, path): self.fp = open(path, "a+b")
+        def acquire(self):
+            try:
+                msvcrt.locking(self.fp.fileno(), msvcrt.LK_NBLCK, 1); return True
+            except OSError: return False
+        def release(self):
+            try: self.fp.seek(0); msvcrt.locking(self.fp.fileno(), msvcrt.LK_UNLCK, 1)
+            except Exception: pass
+        def close(self): 
+            try: self.fp.close()
+            except Exception: pass
+else:
+    import fcntl
+    class FileLock:
+        def __init__(self, path): self.fp = open(path, "a+")
+        def acquire(self):
+            try:
+                fcntl.flock(self.fp.fileno(), fcntl.LOCK_EX | fcntl.LOCK_NB); return True
+            except IOError: return False
+        def release(self):
+            try: fcntl.flock(self.fp.fileno(), fcntl.LOCK_UN)
+            except Exception: pass
+        def close(self):
+            try: self.fp.close()
+            except Exception: pass
+
+def ensure_dir_for_file(path: str):
+    d = os.path.dirname(path)
+    if d and not os.path.exists(d):
+        os.makedirs(d, exist_ok=True)
+
+def atomic_write(path: str, data: str):
+    ensure_dir_for_file(path)
+    dirpath = os.path.dirname(path) or "."
+    fd, tmp_path = tempfile.mkstemp(dir=dirpath)
+    try:
+        with os.fdopen(fd, "w") as tmpf:
+            tmpf.write(data); tmpf.flush(); os.fsync(tmpf.fileno())
+        os.replace(tmp_path, path)
+    except Exception:
+        log("ERROR during atomic write: " + traceback.format_exc(), err=True)
+        try:
+            if os.path.exists(tmp_path): os.remove(tmp_path)
+        except Exception: pass
+
+def read_token_file_if_recent(path: str, ttl: int) -> Optional[str]:
+    try:
+        if os.path.exists(path):
+            mtime = os.path.getmtime(path)
+            age = time.time() - mtime
+            if age <= ttl:
+                with open(path, "r") as f: return f.read().strip()
+    except Exception: pass
+    return None
+
+def fetch_token_from_api() -> Optional[str]:
+    attempt = 0; delay = 1.0
+    while attempt < MAX_RETRIES:
+        attempt += 1
+        try:
+            log(f"Attempting auth request (attempt {attempt}) to {AUTH_URL}")
+            resp = requests.post(AUTH_URL, json=AUTH_BODY, timeout=REQUEST_TIMEOUT)
+            resp.raise_for_status()
+            if TOKEN_JSON_KEY:
+                try:
+                    obj = resp.json(); token = obj.get(TOKEN_JSON_KEY)
+                    if token: return token.strip()
+                    else: log("Token JSON key not found; falling back to raw body", err=True)
+                except ValueError:
+                    log("Response not JSON; falling back to raw body", err=True)
+            text = resp.text.strip()
+            return text if text else None
+        except Exception as e:
+            log(f"Auth request failed: {e}", err=True)
+            if attempt < MAX_RETRIES:
+                time.sleep(delay); delay *= RETRY_BACKOFF
+    return None
+
+def main():
+    lockfile_path = TOKEN_OUT + ".lock"
+    lock = FileLock(lockfile_path)
+    log("Starting refresh_token_daemon")
+    log(f"AUTH_URL: {AUTH_URL}")
+    log(f"TOKEN_OUT: {TOKEN_OUT}")
+    log(f"TOKEN_JSON_KEY: {TOKEN_JSON_KEY!r}")
+    log(f"REFRESH_TTL: {REFRESH_TTL}s  REFRESH_FREQ: {REFRESH_FREQ}s")
+    ensure_dir_for_file(TOKEN_OUT)
+    try:
+        while True:
+            existing = read_token_file_if_recent(TOKEN_OUT, REFRESH_TTL)
+            if existing:
+                log(f"Token is fresh (<= {REFRESH_TTL}s). Sleeping {REFRESH_FREQ}s.")
+                time.sleep(REFRESH_FREQ); continue
+            got_lock = lock.acquire()
+            if not got_lock:
+                log("Another process refreshing token; waiting."); time.sleep(REFRESH_FREQ); continue
+            try:
+                existing = read_token_file_if_recent(TOKEN_OUT, REFRESH_TTL)
+                if existing:
+                    log("Token written by another process while waiting for lock; skipping fetch."); continue
+                token = fetch_token_from_api()
+                if token:
+                    atomic_write(TOKEN_OUT, token)
+                    log("Token refreshed and written successfully.")
+                else:
+                    log("Failed to fetch token after retries; will retry later.", err=True)
+            finally:
+                lock.release()
+            time.sleep(REFRESH_FREQ)
+    except KeyboardInterrupt:
+        log("Interrupted by user; exiting.")
+    except Exception:
+        log("Unexpected error: " + traceback.format_exc(), err=True)
+    finally:
+        try: lock.close()
+        except Exception: pass
+
+if __name__ == "__main__":
+    main()