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