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""" Cred plugin for UNIX user accounts. """ from __future__ import absolute_import, division from zope.interface import implementer from twisted import plugin from twisted.cred.strcred import ICheckerFactory from twisted.cred.checkers import ICredentialsChecker from twisted.cred.credentials import IUsernamePassword from twisted.cred.error import UnauthorizedLogin from twisted.internet import defer from twisted.python.compat import StringType def verifyCryptedPassword(crypted, pw): """ Use L{crypt.crypt} to Verify that an unencrypted password matches the encrypted password. @param crypted: The encrypted password, obtained from the Unix password database or Unix shadow password database. @param pw: The unencrypted password. @return: L{True} if there is successful match, else L{False}. @rtype: L{bool} """ try: import crypt except ImportError: crypt = None if crypt is None: raise NotImplementedError("cred_unix not supported on this platform") if not isinstance(pw, StringType): pw = pw.decode('utf-8') if not isinstance(crypted, StringType): crypted = crypted.decode('utf-8') return crypt.crypt(pw, crypted) == crypted @implementer(ICredentialsChecker) class UNIXChecker(object): """ A credentials checker for a UNIX server. This will check that an authenticating username/password is a valid user on the system. Does not work on Windows. Right now this supports Python's pwd and spwd modules, if they are installed. It does not support PAM. """ credentialInterfaces = (IUsernamePassword,) def checkPwd(self, pwd, username, password): """ Obtain the encrypted password for C{username} from the Unix password database using L{pwd.getpwnam}, and see if it it matches it matches C{password}. @param pwd: Module which provides functions which access to the Unix password database. @type pwd: C{module} @param username: The user to look up in the Unix password database. @type username: L{unicode}/L{str} or L{bytes} @param password: The password to compare. @type username: L{unicode}/L{str} or L{bytes} """ try: if not isinstance(username, StringType): username = username.decode('utf-8') cryptedPass = pwd.getpwnam(username).pw_passwd except KeyError: return defer.fail(UnauthorizedLogin()) else: if cryptedPass in ('*', 'x'): # Allow checkSpwd to take over return None elif verifyCryptedPassword(cryptedPass, password): return defer.succeed(username) def checkSpwd(self, spwd, username, password): """ Obtain the encrypted password for C{username} from the Unix shadow password database using L{spwd.getspnam}, and see if it it matches it matches C{password}. @param spwd: Module which provides functions which access to the Unix shadow password database. @type pwd: C{module} @param username: The user to look up in the Unix password database. @type username: L{unicode}/L{str} or L{bytes} @param password: The password to compare. @type username: L{unicode}/L{str} or L{bytes} """ try: if not isinstance(username, StringType): username = username.decode('utf-8') if getattr(spwd.struct_spwd, "sp_pwdp", None): # Python 3 cryptedPass = spwd.getspnam(username).sp_pwdp else: # Python 2 cryptedPass = spwd.getspnam(username).sp_pwd except KeyError: return defer.fail(UnauthorizedLogin()) else: if verifyCryptedPassword(cryptedPass, password): return defer.succeed(username) def requestAvatarId(self, credentials): username, password = credentials.username, credentials.password try: import pwd except ImportError: pwd = None if pwd is not None: checked = self.checkPwd(pwd, username, password) if checked is not None: return checked try: import spwd except ImportError: spwd = None if spwd is not None: checked = self.checkSpwd(spwd, username, password) if checked is not None: return checked # TODO: check_pam? # TODO: check_shadow? return defer.fail(UnauthorizedLogin()) unixCheckerFactoryHelp = """ This checker will attempt to use every resource available to authenticate against the list of users on the local UNIX system. (This does not support Windows servers for very obvious reasons.) Right now, this includes support for: * Python's pwd module (which checks /etc/passwd) * Python's spwd module (which checks /etc/shadow) Future versions may include support for PAM authentication. """ @implementer(ICheckerFactory, plugin.IPlugin) class UNIXCheckerFactory(object): """ A factory for L{UNIXChecker}. """ authType = 'unix' authHelp = unixCheckerFactoryHelp argStringFormat = 'No argstring required.' credentialInterfaces = UNIXChecker.credentialInterfaces def generateChecker(self, argstring): """ This checker factory ignores the argument string. Everything needed to generate a user database is pulled out of the local UNIX environment. """ return UNIXChecker() theUnixCheckerFactory = UNIXCheckerFactory()