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Handle long passwords for bcrypt

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TronoSfera 2026-01-19 11:54:05 +03:00
parent d92aac0715
commit e87ffbd60d
1 changed files with 5 additions and 3 deletions
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8
server/auth.py
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@ -15,6 +15,7 @@ from __future__ import annotations
import os import os
import datetime import datetime
import hashlib
from typing import Optional from typing import Optional
from jose import JWTError, jwt from jose import JWTError, jwt
@ -45,16 +46,17 @@ except Exception:
pwd_context = CryptContext(schemes=["bcrypt_sha256", "bcrypt"], deprecated="auto") pwd_context = CryptContext(schemes=["bcrypt_sha256", "bcrypt"], deprecated="auto")
def _normalize_bcrypt_password(password: str) -> str | bytes: def _normalize_bcrypt_password(password: str) -> str:
"""Normalize passwords to avoid bcrypt's 72-byte length limit. """Normalize passwords to avoid bcrypt's 72-byte length limit.
Some bcrypt backends raise a ValueError for passwords longer than 72 bytes. Some bcrypt backends raise a ValueError for passwords longer than 72 bytes.
Truncate to 72 bytes to match typical bcrypt behavior instead of crashing. Instead of truncating, hash the original bytes with SHA-256 to preserve
entropy while ensuring the input length stays within bcrypt limits.
""" """
encoded = password.encode("utf-8") encoded = password.encode("utf-8")
if len(encoded) <= 72: if len(encoded) <= 72:
return password return password
return encoded[:72] return hashlib.sha256(encoded).hexdigest()
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/login", auto_error=False) oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/login", auto_error=False)