57 lines
2 KiB
Python
57 lines
2 KiB
Python
import logging
|
|
|
|
from base64 import b64decode
|
|
from flask import request
|
|
|
|
from auth.credentials import validate_credentials
|
|
from auth.validateresult import ValidateResult, AuthKind
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
def has_basic_auth(username):
|
|
""" Returns true if a basic auth header exists with a username and password pair that validates
|
|
against the internal authentication system. Returns True on full success and False on any
|
|
failure (missing header, invalid header, invalid credentials, etc).
|
|
"""
|
|
auth_header = request.headers.get('authorization', '')
|
|
result = validate_basic_auth(auth_header)
|
|
return result.has_user and result.user.username == username
|
|
|
|
|
|
def validate_basic_auth(auth_header):
|
|
""" Validates the specified basic auth header, returning whether its credentials point
|
|
to a valid user or token.
|
|
"""
|
|
if not auth_header:
|
|
return ValidateResult(AuthKind.basic, missing=True)
|
|
|
|
logger.debug('Attempt to process basic auth header')
|
|
|
|
# Parse the basic auth header.
|
|
credentials, err = _parse_basic_auth_header(auth_header)
|
|
if err is not None:
|
|
logger.debug('Got invalid basic auth header: %s', auth_header)
|
|
return ValidateResult(AuthKind.basic, missing=True)
|
|
|
|
auth_username, auth_password_or_token = credentials
|
|
result, _ = validate_credentials(auth_username, auth_password_or_token)
|
|
return result.with_kind(AuthKind.basic)
|
|
|
|
|
|
def _parse_basic_auth_header(auth):
|
|
""" Parses the given basic auth header, returning the credentials found inside.
|
|
"""
|
|
normalized = [part.strip() for part in auth.split(' ') if part]
|
|
if normalized[0].lower() != 'basic' or len(normalized) != 2:
|
|
return None, 'Invalid basic auth header'
|
|
|
|
try:
|
|
credentials = [part.decode('utf-8') for part in b64decode(normalized[1]).split(':', 1)]
|
|
except TypeError:
|
|
logger.exception('Exception when parsing basic auth header: %s', auth)
|
|
return None, 'Could not parse basic auth header'
|
|
|
|
if len(credentials) != 2:
|
|
return None, 'Unexpected number of credentials found in basic auth header'
|
|
|
|
return credentials, None
|