mirror of https://gitlab.com/bashrc2/epicyon
313 lines
11 KiB
Python
313 lines
11 KiB
Python
__filename__ = "auth.py"
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__author__ = "Bob Mottram"
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__license__ = "AGPL3+"
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__version__ = "1.2.0"
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__maintainer__ = "Bob Mottram"
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__email__ = "bob@freedombone.net"
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__status__ = "Production"
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__module_group__ = "Security"
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import base64
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import hashlib
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import binascii
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import os
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import secrets
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import datetime
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from utils import isSystemAccount
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from utils import hasUsersPath
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def _hashPassword(password: str) -> str:
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"""Hash a password for storing
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"""
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salt = hashlib.sha256(os.urandom(60)).hexdigest().encode('ascii')
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pwdhash = hashlib.pbkdf2_hmac('sha512',
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password.encode('utf-8'),
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salt, 100000)
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pwdhash = binascii.hexlify(pwdhash)
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return (salt + pwdhash).decode('ascii')
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def _getPasswordHash(salt: str, providedPassword: str) -> str:
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"""Returns the hash of a password
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"""
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pwdhash = hashlib.pbkdf2_hmac('sha512',
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providedPassword.encode('utf-8'),
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salt.encode('ascii'),
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100000)
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return binascii.hexlify(pwdhash).decode('ascii')
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def constantTimeStringCheck(string1: str, string2: str) -> bool:
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"""Compares two string and returns if they are the same
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using a constant amount of time
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See https://sqreen.github.io/DevelopersSecurityBestPractices/
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timing-attack/python
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"""
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# strings must be of equal length
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if len(string1) != len(string2):
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return False
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ctr = 0
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matched = True
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for ch in string1:
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if ch != string2[ctr]:
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matched = False
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else:
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# this is to make the timing more even
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# and not provide clues
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matched = matched
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ctr += 1
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return matched
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def _verifyPassword(storedPassword: str, providedPassword: str) -> bool:
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"""Verify a stored password against one provided by user
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"""
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if not storedPassword:
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return False
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if not providedPassword:
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return False
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salt = storedPassword[:64]
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storedPassword = storedPassword[64:]
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pwHash = _getPasswordHash(salt, providedPassword)
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return constantTimeStringCheck(pwHash, storedPassword)
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def createBasicAuthHeader(nickname: str, password: str) -> str:
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"""This is only used by tests
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"""
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authStr = \
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nickname.replace('\n', '').replace('\r', '') + \
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':' + \
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password.replace('\n', '').replace('\r', '')
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return 'Basic ' + base64.b64encode(authStr.encode('utf-8')).decode('utf-8')
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def authorizeBasic(baseDir: str, path: str, authHeader: str,
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debug: bool) -> bool:
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"""HTTP basic auth
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"""
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if ' ' not in authHeader:
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if debug:
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print('DEBUG: basic auth - Authorisation header does not ' +
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'contain a space character')
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return False
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if not hasUsersPath(path):
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if debug:
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print('DEBUG: basic auth - ' +
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'path for Authorization does not contain a user')
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return False
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pathUsersSection = path.split('/users/')[1]
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if '/' not in pathUsersSection:
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if debug:
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print('DEBUG: basic auth - this is not a users endpoint')
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return False
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nicknameFromPath = pathUsersSection.split('/')[0]
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if isSystemAccount(nicknameFromPath):
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print('basic auth - attempted login using system account ' +
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nicknameFromPath + ' in path')
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return False
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base64Str = \
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authHeader.split(' ')[1].replace('\n', '').replace('\r', '')
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plain = base64.b64decode(base64Str).decode('utf-8')
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if ':' not in plain:
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if debug:
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print('DEBUG: basic auth header does not contain a ":" ' +
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'separator for username:password')
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return False
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nickname = plain.split(':')[0]
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if isSystemAccount(nickname):
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print('basic auth - attempted login using system account ' + nickname +
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' in Auth header')
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return False
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if nickname != nicknameFromPath:
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if debug:
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print('DEBUG: Nickname given in the path (' + nicknameFromPath +
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') does not match the one in the Authorization header (' +
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nickname + ')')
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return False
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passwordFile = baseDir + '/accounts/passwords'
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if not os.path.isfile(passwordFile):
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if debug:
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print('DEBUG: passwords file missing')
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return False
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providedPassword = plain.split(':')[1]
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with open(passwordFile, 'r') as passfile:
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for line in passfile:
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if not line.startswith(nickname + ':'):
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continue
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storedPassword = \
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line.split(':')[1].replace('\n', '').replace('\r', '')
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success = _verifyPassword(storedPassword, providedPassword)
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if not success:
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if debug:
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print('DEBUG: Password check failed for ' + nickname)
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return success
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print('DEBUG: Did not find credentials for ' + nickname +
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' in ' + passwordFile)
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return False
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def authorizeSharedItems(sharedItemsFederatedDomains: [],
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baseDir: str,
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callingDomain: str,
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authHeader: str,
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debug: bool) -> bool:
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"""HTTP simple token check for shared item federation
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"""
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if not sharedItemsFederatedDomains:
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# no shared item federation
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return False
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if callingDomain not in sharedItemsFederatedDomains:
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if debug:
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print(callingDomain +
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' is not in the shared items federation list')
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return False
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if 'Basic ' in authHeader:
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if debug:
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print('DEBUG: shared item federation should not use basic auth')
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return False
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providedToken = authHeader.replace('\n', '').replace('\r', '').strip()
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if not providedToken:
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if debug:
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print('DEBUG: shared item federation token is empty')
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return False
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if len(providedToken) < 60:
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if debug:
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print('DEBUG: shared item federation token is too small ' +
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providedToken)
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return False
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tokensFile = baseDir + '/accounts/sharedItemsFederationTokens'
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if not os.path.isfile(tokensFile):
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if debug:
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print('DEBUG: shared item federation tokens file missing ' +
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tokensFile)
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return False
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# check the tokens file
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with open(tokensFile, 'r') as tokfile:
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for line in tokfile:
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if not line.startswith(callingDomain + ':'):
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continue
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storedToken = \
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line.split(':')[1].replace('\n', '').replace('\r', '')
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if constantTimeStringCheck(storedToken, providedToken):
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return True
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else:
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if debug:
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print('DEBUG: shared item federation token ' +
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'check failed for ' + callingDomain)
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return False
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print('DEBUG: shared item federation token for ' + callingDomain +
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' not found in ' + tokensFile)
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return False
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def storeBasicCredentials(baseDir: str, nickname: str, password: str) -> bool:
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"""Stores login credentials to a file
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"""
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if ':' in nickname or ':' in password:
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return False
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nickname = nickname.replace('\n', '').replace('\r', '').strip()
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password = password.replace('\n', '').replace('\r', '').strip()
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if not os.path.isdir(baseDir + '/accounts'):
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os.mkdir(baseDir + '/accounts')
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passwordFile = baseDir + '/accounts/passwords'
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storeStr = nickname + ':' + _hashPassword(password)
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if os.path.isfile(passwordFile):
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if nickname + ':' in open(passwordFile).read():
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with open(passwordFile, 'r') as fin:
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with open(passwordFile + '.new', 'w+') as fout:
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for line in fin:
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if not line.startswith(nickname + ':'):
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fout.write(line)
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else:
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fout.write(storeStr + '\n')
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os.rename(passwordFile + '.new', passwordFile)
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else:
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# append to password file
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with open(passwordFile, 'a+') as passfile:
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passfile.write(storeStr + '\n')
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else:
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with open(passwordFile, 'w+') as passfile:
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passfile.write(storeStr + '\n')
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return True
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def removePassword(baseDir: str, nickname: str) -> None:
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"""Removes the password entry for the given nickname
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This is called during account removal
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"""
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passwordFile = baseDir + '/accounts/passwords'
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if os.path.isfile(passwordFile):
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with open(passwordFile, 'r') as fin:
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with open(passwordFile + '.new', 'w+') as fout:
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for line in fin:
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if not line.startswith(nickname + ':'):
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fout.write(line)
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os.rename(passwordFile + '.new', passwordFile)
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def authorize(baseDir: str, path: str, authHeader: str, debug: bool) -> bool:
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"""Authorize using http header
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"""
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if authHeader.lower().startswith('basic '):
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return authorizeBasic(baseDir, path, authHeader, debug)
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return False
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def createPassword(length: int = 10):
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validChars = 'abcdefghijklmnopqrstuvwxyz' + \
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'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
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return ''.join((secrets.choice(validChars) for i in range(length)))
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def recordLoginFailure(baseDir: str, ipAddress: str,
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countDict: {}, failTime: int,
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logToFile: bool) -> None:
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"""Keeps ip addresses and the number of times login failures
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occured for them in a dict
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"""
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if not countDict.get(ipAddress):
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while len(countDict.items()) > 100:
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oldestTime = 0
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oldestIP = None
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for ipAddr, ipItem in countDict.items():
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if oldestTime == 0 or ipItem['time'] < oldestTime:
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oldestTime = ipItem['time']
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oldestIP = ipAddr
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if oldestIP:
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del countDict[oldestIP]
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countDict[ipAddress] = {
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"count": 1,
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"time": failTime
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}
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else:
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countDict[ipAddress]['count'] += 1
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countDict[ipAddress]['time'] = failTime
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failCount = countDict[ipAddress]['count']
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if failCount > 4:
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print('WARN: ' + str(ipAddress) + ' failed to log in ' +
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str(failCount) + ' times')
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if not logToFile:
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return
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failureLog = baseDir + '/accounts/loginfailures.log'
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writeType = 'a+'
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if not os.path.isfile(failureLog):
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writeType = 'w+'
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currTime = datetime.datetime.utcnow()
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try:
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with open(failureLog, writeType) as fp:
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# here we use a similar format to an ssh log, so that
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# systems such as fail2ban can parse it
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fp.write(currTime.strftime("%Y-%m-%d %H:%M:%SZ") + ' ' +
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'ip-127-0-0-1 sshd[20710]: ' +
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'Disconnecting invalid user epicyon ' +
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ipAddress + ' port 443: ' +
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'Too many authentication failures [preauth]\n')
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except BaseException:
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pass
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