81 lines
2.6 KiB
Python
81 lines
2.6 KiB
Python
"""
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Server-side auth helpers: password hashing (stdlib PBKDF2, no external deps)
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and opaque session tokens stored in the DB. Used by main.py for the
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register -> admin-approval -> login flow.
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"""
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import hashlib
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import hmac
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import secrets
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from datetime import datetime, timedelta, timezone
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from db import get_conn
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_ITER = 600_000 # new hashes; verify_password honours the iters stored per-hash, so old 200k hashes still work
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SESSION_DAYS = 7
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def hash_password(pw: str) -> str:
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salt = secrets.token_bytes(16)
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dk = hashlib.pbkdf2_hmac("sha256", pw.encode("utf-8"), salt, _ITER)
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return f"pbkdf2_sha256${_ITER}${salt.hex()}${dk.hex()}"
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def verify_password(pw: str, stored: str | None) -> bool:
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if not stored:
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return False
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try:
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algo, iters, salt_hex, dk_hex = stored.split("$")
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if algo != "pbkdf2_sha256":
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return False
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dk = hashlib.pbkdf2_hmac("sha256", pw.encode("utf-8"), bytes.fromhex(salt_hex), int(iters))
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return hmac.compare_digest(dk.hex(), dk_hex)
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except Exception:
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return False
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def create_session(user_id: int) -> str:
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token = secrets.token_urlsafe(32)
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now = datetime.now(timezone.utc)
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exp = now + timedelta(days=SESSION_DAYS)
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with get_conn() as c:
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c.execute(
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"INSERT INTO sessions(token, user_id, created_at, expires_at) VALUES(?,?,?,?)",
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(token, user_id, now.isoformat(), exp.isoformat()),
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)
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return token
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def delete_session(token: str | None) -> None:
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if not token:
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return
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with get_conn() as c:
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c.execute("DELETE FROM sessions WHERE token=?", (token,))
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def revoke_all_sessions(user_id: int) -> None:
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"""Kill every active session for a user (e.g. on password change/compromise)."""
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with get_conn() as c:
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c.execute("DELETE FROM sessions WHERE user_id=?", (user_id,))
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def user_for_token(token: str | None):
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"""Return the user row for a valid, unexpired session token, else None."""
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if not token:
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return None
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with get_conn() as c:
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row = c.execute(
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"""SELECT u.id, u.name, u.email, u.phone, u.status, s.expires_at
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FROM sessions s JOIN users u ON u.id = s.user_id
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WHERE s.token = ?""",
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(token,),
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).fetchone()
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if not row:
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return None
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try:
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if datetime.fromisoformat(row["expires_at"]) < datetime.now(timezone.utc):
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delete_session(token)
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return None
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except Exception:
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return None
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return row
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