VirtualMailManager/password.py
author Pascal Volk <user@localhost.localdomain.org>
Sat, 01 Feb 2014 20:29:23 +0000
changeset 708 93b2f5859866
parent 703 58815c004a61
child 711 2a75058fc064
permissions -rw-r--r--
Released vmm-0.6.2
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# -*- coding: UTF-8 -*-
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# Copyright (c) 2010 - 2014, Pascal Volk
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# See COPYING for distribution information.
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"""
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    VirtualMailManager.password
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    ~~~~~~~~~~~~~~~~~~~~~~~~~~~
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    VirtualMailManager's password module to generate password hashes from
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    passwords or random passwords. This module provides following
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    functions:
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        hashed_password = pwhash(password[, scheme][, user])
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        random_password = randompw()
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        scheme, encoding = verify_scheme(scheme)
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        schemes, encodings = list_schemes()
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"""
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from crypt import crypt
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from random import SystemRandom
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from subprocess import Popen, PIPE
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try:
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    import hashlib
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except ImportError:
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    from VirtualMailManager.pycompat import hashlib
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from VirtualMailManager import ENCODING
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from VirtualMailManager.emailaddress import EmailAddress
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from VirtualMailManager.common import get_unicode, version_str
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from VirtualMailManager.constants import VMM_ERROR
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from VirtualMailManager.errors import VMMError
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COMPAT = hasattr(hashlib, 'compat')
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SALTCHARS = './0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
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PASSWDCHARS = '._-+#*23456789abcdefghikmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ'
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DEFAULT_B64 = (None, 'B64', 'BASE64')
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DEFAULT_HEX = (None, 'HEX')
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CRYPT_ID_MD5 = 1
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CRYPT_ID_BLF = '2a'
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CRYPT_ID_SHA256 = 5
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CRYPT_ID_SHA512 = 6
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CRYPT_SALT_LEN = 2
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CRYPT_BLF_ROUNDS_MIN = 4
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CRYPT_BLF_ROUNDS_MAX = 31
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CRYPT_BLF_SALT_LEN = 22
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CRYPT_MD5_SALT_LEN = 8
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CRYPT_SHA2_ROUNDS_DEFAULT = 5000
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CRYPT_SHA2_ROUNDS_MIN = 1000
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CRYPT_SHA2_ROUNDS_MAX = 999999999
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CRYPT_SHA2_SALT_LEN = 16
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SALTED_ALGO_SALT_LEN = 4
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_ = lambda msg: msg
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cfg_dget = lambda option: None
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_sys_rand = SystemRandom()
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_choice = _sys_rand.choice
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_get_salt = lambda s_len: ''.join(_choice(SALTCHARS) for x in xrange(s_len))
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def _dovecotpw(password, scheme, encoding):
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    """Communicates with dovecotpw (Dovecot 2.0: `doveadm pw`) and returns
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    the hashed password: {scheme[.encoding]}hash
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    """
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    if encoding:
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        scheme = '.'.join((scheme, encoding))
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    cmd_args = [cfg_dget('bin.dovecotpw'), '-s', scheme, '-p',
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                get_unicode(password)]
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    if cfg_dget('misc.dovecot_version') >= 0x20000a01:
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        cmd_args.insert(1, 'pw')
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    process = Popen(cmd_args, stdout=PIPE, stderr=PIPE)
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    stdout, stderr = process.communicate()
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    if process.returncode:
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        raise VMMError(stderr.strip(), VMM_ERROR)
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    hashed = stdout.strip()
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    if not hashed.startswith('{%s}' % scheme):
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        raise VMMError('Unexpected result from %s: %s' %
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                       (cfg_dget('bin.dovecotpw'), hashed), VMM_ERROR)
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    return hashed
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def _md4_new():
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    """Returns an new MD4-hash object if supported by the hashlib or
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    provided by PyCrypto - other `None`.
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    """
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    try:
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        return hashlib.new('md4')
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    except ValueError, err:
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        if str(err) == 'unsupported hash type':
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            if not COMPAT:
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                try:
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                    from Crypto.Hash import MD4
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                    return MD4.new()
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                except ImportError:
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                    return None
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        else:
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            raise
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def _sha256_new(data=''):
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    """Returns a new sha256 object from the hashlib.
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    Returns `None` if the PyCrypto in pycompat.hashlib is too old."""
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    if not COMPAT:
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        return hashlib.sha256(data)
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    try:
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        return hashlib.new('sha256', data)
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    except ValueError, err:
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        if str(err) == 'unsupported hash type':
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            return None
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        else:
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            raise
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def _format_digest(digest, scheme, encoding):
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    """Formats the arguments to a string: {scheme[.encoding]}digest."""
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    if not encoding:
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        return '{%s}%s' % (scheme, digest)
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    return '{%s.%s}%s' % (scheme, encoding, digest)
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def _clear_hash(password, scheme, encoding):
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    """Generates a (encoded) CLEARTEXT/PLAIN 'hash'."""
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    if encoding:
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        if encoding == 'HEX':
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            password = password.encode('hex')
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        else:
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            password = password.encode('base64').replace('\n', '')
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        return _format_digest(password, scheme, encoding)
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    return get_unicode('{%s}%s' % (scheme, password))
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def _get_crypt_blowfish_salt():
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    """Generates a salt for Blowfish crypt."""
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    rounds = cfg_dget('misc.crypt_blowfish_rounds')
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    if rounds < CRYPT_BLF_ROUNDS_MIN:
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        rounds = CRYPT_BLF_ROUNDS_MIN
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    elif rounds > CRYPT_BLF_ROUNDS_MAX:
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        rounds = CRYPT_BLF_ROUNDS_MAX
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    return '$%s$%02d$%s' % (CRYPT_ID_BLF, rounds,
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                            _get_salt(CRYPT_BLF_SALT_LEN))
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291
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def _get_crypt_sha2_salt(crypt_id):
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    """Generates a salt for crypt using the SHA-256 or SHA-512 encryption
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    method.
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    *crypt_id* must be either `5` (SHA-256) or `6` (SHA-512).
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    """
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    assert crypt_id in (CRYPT_ID_SHA256, CRYPT_ID_SHA512), 'invalid crypt ' \
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           'id: %r' % crypt_id
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    if crypt_id is CRYPT_ID_SHA512:
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        rounds = cfg_dget('misc.crypt_sha512_rounds')
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    else:
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        rounds = cfg_dget('misc.crypt_sha256_rounds')
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    if rounds < CRYPT_SHA2_ROUNDS_MIN:
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        rounds = CRYPT_SHA2_ROUNDS_MIN
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    elif rounds > CRYPT_SHA2_ROUNDS_MAX:
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        rounds = CRYPT_SHA2_ROUNDS_MAX
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    if rounds == CRYPT_SHA2_ROUNDS_DEFAULT:
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        return '$%d$%s' % (crypt_id, _get_salt(CRYPT_SHA2_SALT_LEN))
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    return '$%d$rounds=%d$%s' % (crypt_id, rounds,
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                                 _get_salt(CRYPT_SHA2_SALT_LEN))
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268
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def _crypt_hash(password, scheme, encoding):
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    """Generates (encoded) CRYPT/MD5/{BLF,MD5,SHA{256,512}}-CRYPT hashes."""
268
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    if scheme == 'CRYPT':
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        salt = _get_salt(CRYPT_SALT_LEN)
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    elif scheme == 'BLF-CRYPT':
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        salt = _get_crypt_blowfish_salt()
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    elif scheme in ('MD5-CRYPT', 'MD5'):
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        salt = '$%d$%s' % (CRYPT_ID_MD5, _get_salt(CRYPT_MD5_SALT_LEN))
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    elif scheme == 'SHA256-CRYPT':
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        salt = _get_crypt_sha2_salt(CRYPT_ID_SHA256)
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    else:
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        salt = _get_crypt_sha2_salt(CRYPT_ID_SHA512)
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    encrypted = crypt(password, salt)
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    if encoding:
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        if encoding == 'HEX':
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            encrypted = encrypted.encode('hex')
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        else:
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            encrypted = encrypted.encode('base64').replace('\n', '')
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    if scheme in ('BLF-CRYPT', 'SHA256-CRYPT', 'SHA512-CRYPT') and \
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       cfg_dget('misc.dovecot_version') < 0x20000b06:
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        scheme = 'CRYPT'
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    return _format_digest(encrypted, scheme, encoding)
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def _md4_hash(password, scheme, encoding):
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    """Generates encoded PLAIN-MD4 hashes."""
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    md4 = _md4_new()
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    if md4:
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        md4.update(password)
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        if encoding in DEFAULT_HEX:
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            digest = md4.hexdigest()
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        else:
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            digest = md4.digest().encode('base64').rstrip()
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        return _format_digest(digest, scheme, encoding)
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    return _dovecotpw(password, scheme, encoding)
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def _md5_hash(password, scheme, encoding, user=None):
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    """Generates DIGEST-MD5 aka PLAIN-MD5 and LDAP-MD5 hashes."""
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    md5 = hashlib.md5()
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    if scheme == 'DIGEST-MD5':
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        #  Prior to Dovecot v1.1.12/v1.2.beta2 there was a problem with a
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        #  empty auth_realms setting in dovecot.conf and user@domain.tld
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        #  usernames. So we have to generate different hashes for different
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        #  versions. See also:
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        #       http://dovecot.org/list/dovecot-news/2009-March/000103.html
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        #       http://hg.dovecot.org/dovecot-1.1/rev/2b0043ba89ae
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        if cfg_dget('misc.dovecot_version') >= 0x1010cf00:
268
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            md5.update('%s:%s:' % (user.localpart, user.domainname))
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        else:
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            md5.update('%s::' % user)
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    md5.update(password)
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    if (scheme in ('PLAIN-MD5', 'DIGEST-MD5') and encoding in DEFAULT_HEX) or \
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       (scheme == 'LDAP-MD5' and encoding == 'HEX'):
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        digest = md5.hexdigest()
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    else:
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        digest = md5.digest().encode('base64').rstrip()
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    return _format_digest(digest, scheme, encoding)
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def _ntlm_hash(password, scheme, encoding):
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    """Generates NTLM hashes."""
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    md4 = _md4_new()
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    if md4:
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        password = ''.join('%s\x00' % c for c in password)
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        md4.update(password)
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        if encoding in DEFAULT_HEX:
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            digest = md4.hexdigest()
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        else:
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            digest = md4.digest().encode('base64').rstrip()
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        return _format_digest(digest, scheme, encoding)
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    return _dovecotpw(password, scheme, encoding)
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def _sha1_hash(password, scheme, encoding):
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    """Generates SHA1 aka SHA hashes."""
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    sha1 = hashlib.sha1(password)
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   242
    if encoding in DEFAULT_B64:
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        digest = sha1.digest().encode('base64').rstrip()
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    else:
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        digest = sha1.hexdigest()
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    return _format_digest(digest, scheme, encoding)
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def _sha256_hash(password, scheme, encoding):
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    """Generates SHA256 hashes."""
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   251
    sha256 = _sha256_new(password)
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   252
    if sha256:
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   253
        if encoding in DEFAULT_B64:
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   254
            digest = sha256.digest().encode('base64').rstrip()
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   255
        else:
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   256
            digest = sha256.hexdigest()
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   257
        return _format_digest(digest, scheme, encoding)
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   258
    return _dovecotpw(password, scheme, encoding)
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   259
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   260
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def _sha512_hash(password, scheme, encoding):
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   262
    """Generates SHA512 hashes."""
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   263
    if not COMPAT:
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   264
        sha512 = hashlib.sha512(password)
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   265
        if encoding in DEFAULT_B64:
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   266
            digest = sha512.digest().encode('base64').replace('\n', '')
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diff changeset
   267
        else:
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   268
            digest = sha512.hexdigest()
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   269
        return _format_digest(digest, scheme, encoding)
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   270
    return _dovecotpw(password, scheme, encoding)
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   271
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   272
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   273
def _smd5_hash(password, scheme, encoding):
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   274
    """Generates SMD5 (salted PLAIN-MD5) hashes."""
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    md5 = hashlib.md5(password)
292
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   276
    salt = _get_salt(SALTED_ALGO_SALT_LEN)
268
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   277
    md5.update(salt)
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   278
    if encoding in DEFAULT_B64:
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   279
        digest = (md5.digest() + salt).encode('base64').rstrip()
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   280
    else:
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   281
        digest = md5.hexdigest() + salt.encode('hex')
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   282
    return _format_digest(digest, scheme, encoding)
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   283
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   284
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   285
def _ssha1_hash(password, scheme, encoding):
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   286
    """Generates SSHA (salted SHA/SHA1) hashes."""
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diff changeset
   287
    sha1 = hashlib.sha1(password)
292
619dadc0fd25 VMM/password: added some CRYPT_* constants.
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   288
    salt = _get_salt(SALTED_ALGO_SALT_LEN)
268
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diff changeset
   289
    sha1.update(salt)
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diff changeset
   290
    if encoding in DEFAULT_B64:
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   291
        digest = (sha1.digest() + salt).encode('base64').rstrip()
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   292
    else:
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   293
        digest = sha1.hexdigest() + salt.encode('hex')
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parents:
diff changeset
   294
    return _format_digest(digest, scheme, encoding)
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diff changeset
   295
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parents:
diff changeset
   296
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diff changeset
   297
def _ssha256_hash(password, scheme, encoding):
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diff changeset
   298
    """Generates SSHA256 (salted SHA256) hashes."""
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diff changeset
   299
    sha256 = _sha256_new(password)
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diff changeset
   300
    if sha256:
292
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diff changeset
   301
        salt = _get_salt(SALTED_ALGO_SALT_LEN)
268
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diff changeset
   302
        sha256.update(salt)
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parents:
diff changeset
   303
        if encoding in DEFAULT_B64:
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diff changeset
   304
            digest = (sha256.digest() + salt).encode('base64').rstrip()
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parents:
diff changeset
   305
        else:
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parents:
diff changeset
   306
            digest = sha256.hexdigest() + salt.encode('hex')
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parents:
diff changeset
   307
        return _format_digest(digest, scheme, encoding)
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parents:
diff changeset
   308
    return _dovecotpw(password, scheme, encoding)
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diff changeset
   309
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   310
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diff changeset
   311
def _ssha512_hash(password, scheme, encoding):
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diff changeset
   312
    """Generates SSHA512 (salted SHA512) hashes."""
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diff changeset
   313
    if not COMPAT:
292
619dadc0fd25 VMM/password: added some CRYPT_* constants.
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diff changeset
   314
        salt = _get_salt(SALTED_ALGO_SALT_LEN)
268
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diff changeset
   315
        sha512 = hashlib.sha512(password + salt)
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parents:
diff changeset
   316
        if encoding in DEFAULT_B64:
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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diff changeset
   317
            digest = (sha512.digest() + salt).encode('base64').replace('\n',
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   318
                                                                       '')
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parents:
diff changeset
   319
        else:
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parents:
diff changeset
   320
            digest = sha512.hexdigest() + salt.encode('hex')
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   321
        return _format_digest(digest, scheme, encoding)
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   322
    return _dovecotpw(password, scheme, encoding)
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parents:
diff changeset
   323
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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diff changeset
   324
_scheme_info = {
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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diff changeset
   325
    'CLEARTEXT': (_clear_hash, 0x10000f00),
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   326
    'CRAM-MD5': (_dovecotpw, 0x10000f00),
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   327
    'CRYPT': (_crypt_hash, 0x10000f00),
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   328
    'DIGEST-MD5': (_md5_hash, 0x10000f00),
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   329
    'HMAC-MD5': (_dovecotpw, 0x10000f00),
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   330
    'LANMAN': (_dovecotpw, 0x10000f00),
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   331
    'LDAP-MD5': (_md5_hash, 0x10000f00),
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   332
    'MD5': (_crypt_hash, 0x10000f00),
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   333
    'MD5-CRYPT': (_crypt_hash, 0x10000f00),
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   334
    'NTLM': (_ntlm_hash, 0x10000f00),
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   335
    'OTP': (_dovecotpw, 0x10100a01),
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   336
    'PLAIN': (_clear_hash, 0x10000f00),
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   337
    'PLAIN-MD4': (_md4_hash, 0x10000f00),
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   338
    'PLAIN-MD5': (_md5_hash, 0x10000f00),
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   339
    'RPA': (_dovecotpw, 0x10000f00),
633
8ea32fbfc9df VMM/password: Added scheme SCRAM-SHA-1.
Pascal Volk <user@localhost.localdomain.org>
parents: 568
diff changeset
   340
    'SCRAM-SHA-1': (_dovecotpw, 0x20200a01),
268
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   341
    'SHA': (_sha1_hash, 0x10000f00),
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   342
    'SHA1': (_sha1_hash, 0x10000f00),
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   343
    'SHA256': (_sha256_hash, 0x10100a01),
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   344
    'SHA512': (_sha512_hash, 0x20000b03),
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   345
    'SKEY': (_dovecotpw, 0x10100a01),
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   346
    'SMD5': (_smd5_hash, 0x10000f00),
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   347
    'SSHA': (_ssha1_hash, 0x10000f00),
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parents:
diff changeset
   348
    'SSHA256': (_ssha256_hash, 0x10200a04),
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   349
    'SSHA512': (_ssha512_hash, 0x20000b03),
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parents:
diff changeset
   350
}
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parents:
diff changeset
   351
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   352
461
cabdf94ec580 VMM/password: Added function list_schemes().
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parents: 417
diff changeset
   353
def list_schemes():
cabdf94ec580 VMM/password: Added function list_schemes().
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parents: 417
diff changeset
   354
    """Returns the tuple (schemes, encodings).
cabdf94ec580 VMM/password: Added function list_schemes().
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parents: 417
diff changeset
   355
cabdf94ec580 VMM/password: Added function list_schemes().
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parents: 417
diff changeset
   356
    `schemes` is an iterator for all supported password schemes (depends on
cabdf94ec580 VMM/password: Added function list_schemes().
Pascal Volk <neverseen@users.sourceforge.net>
parents: 417
diff changeset
   357
    the used Dovecot version and features of the libc).
cabdf94ec580 VMM/password: Added function list_schemes().
Pascal Volk <neverseen@users.sourceforge.net>
parents: 417
diff changeset
   358
    `encodings` is a tuple with all usable encoding suffixes. The tuple may
cabdf94ec580 VMM/password: Added function list_schemes().
Pascal Volk <neverseen@users.sourceforge.net>
parents: 417
diff changeset
   359
    be empty.
cabdf94ec580 VMM/password: Added function list_schemes().
Pascal Volk <neverseen@users.sourceforge.net>
parents: 417
diff changeset
   360
    """
cabdf94ec580 VMM/password: Added function list_schemes().
Pascal Volk <neverseen@users.sourceforge.net>
parents: 417
diff changeset
   361
    dcv = cfg_dget('misc.dovecot_version')
cabdf94ec580 VMM/password: Added function list_schemes().
Pascal Volk <neverseen@users.sourceforge.net>
parents: 417
diff changeset
   362
    schemes = (k for (k, v) in _scheme_info.iteritems() if v[1] <= dcv)
cabdf94ec580 VMM/password: Added function list_schemes().
Pascal Volk <neverseen@users.sourceforge.net>
parents: 417
diff changeset
   363
    if dcv >= 0x10100a01:
464
7d4d79ff08d0 VMM/password: list_schemes(): report suffixes with a leading dot.
Pascal Volk <neverseen@users.sourceforge.net>
parents: 461
diff changeset
   364
        encodings = ('.B64', '.BASE64', '.HEX')
461
cabdf94ec580 VMM/password: Added function list_schemes().
Pascal Volk <neverseen@users.sourceforge.net>
parents: 417
diff changeset
   365
    else:
cabdf94ec580 VMM/password: Added function list_schemes().
Pascal Volk <neverseen@users.sourceforge.net>
parents: 417
diff changeset
   366
        encodings = ()
cabdf94ec580 VMM/password: Added function list_schemes().
Pascal Volk <neverseen@users.sourceforge.net>
parents: 417
diff changeset
   367
    return schemes, encodings
cabdf94ec580 VMM/password: Added function list_schemes().
Pascal Volk <neverseen@users.sourceforge.net>
parents: 417
diff changeset
   368
cabdf94ec580 VMM/password: Added function list_schemes().
Pascal Volk <neverseen@users.sourceforge.net>
parents: 417
diff changeset
   369
287
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   370
def verify_scheme(scheme):
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   371
    """Checks if the password scheme *scheme* is known and supported by the
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   372
    configured `misc.dovecot_version`.
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   373
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   374
    The *scheme* maybe a password scheme's name (e.g.: 'PLAIN') or a scheme
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   375
    name with a encoding suffix (e.g. 'PLAIN.BASE64').  If the scheme is
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   376
    known and supported by the used Dovecot version,
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   377
    a tuple ``(scheme, encoding)`` will be returned.
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   378
    The `encoding` in the tuple may be `None`.
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   379
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   380
    Raises a `VMMError` if the password scheme:
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   381
      * is unknown
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   382
      * depends on a newer Dovecot version
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   383
      * has a unknown encoding suffix
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   384
    """
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   385
    assert isinstance(scheme, basestring), 'Not a str/unicode: %r' % scheme
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   386
    scheme_encoding = scheme.upper().split('.')
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   387
    scheme = scheme_encoding[0]
291
7ef3f117a230 VMM/password: adapted Blowfish/SHA-256/SHA-512 crypt() to recent
Pascal Volk <neverseen@users.sourceforge.net>
parents: 290
diff changeset
   388
    if scheme not in _scheme_info:
287
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   389
        raise VMMError(_(u"Unsupported password scheme: '%s'") % scheme,
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   390
                       VMM_ERROR)
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   391
    if cfg_dget('misc.dovecot_version') < _scheme_info[scheme][1]:
290
e2785e04f92e VMM/…: re-indented long queries and error messages.
Pascal Volk <neverseen@users.sourceforge.net>
parents: 289
diff changeset
   392
        raise VMMError(_(u"The password scheme '%(scheme)s' requires Dovecot "
417
8209da83e256 VMM: Updated some messages. (doesn't, isn't) -> (does not, is not)
Pascal Volk <neverseen@users.sourceforge.net>
parents: 366
diff changeset
   393
                         u">= v%(version)s.") % {'scheme': scheme,
290
e2785e04f92e VMM/…: re-indented long queries and error messages.
Pascal Volk <neverseen@users.sourceforge.net>
parents: 289
diff changeset
   394
                       'version': version_str(_scheme_info[scheme][1])},
287
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   395
                       VMM_ERROR)
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   396
    if len(scheme_encoding) > 1:
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   397
        if cfg_dget('misc.dovecot_version') < 0x10100a01:
290
e2785e04f92e VMM/…: re-indented long queries and error messages.
Pascal Volk <neverseen@users.sourceforge.net>
parents: 289
diff changeset
   398
            raise VMMError(_(u'Encoding suffixes for password schemes require '
417
8209da83e256 VMM: Updated some messages. (doesn't, isn't) -> (does not, is not)
Pascal Volk <neverseen@users.sourceforge.net>
parents: 366
diff changeset
   399
                             u'Dovecot >= v1.1.alpha1.'), VMM_ERROR)
287
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   400
        if scheme_encoding[1] not in ('B64', 'BASE64', 'HEX'):
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   401
            raise VMMError(_(u"Unsupported password encoding: '%s'") %
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   402
                           scheme_encoding[1], VMM_ERROR)
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   403
        encoding = scheme_encoding[1]
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   404
    else:
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   405
        encoding = None
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   406
    return scheme, encoding
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   407
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   408
268
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   409
def pwhash(password, scheme=None, user=None):
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   410
    """Generates a password hash from the plain text *password* string.
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   411
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   412
    If no *scheme* is given the password scheme from the configuration will
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   413
    be used for the hash generation.  When 'DIGEST-MD5' is used as scheme,
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   414
    also an EmailAddress instance must be given as *user* argument.
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   415
    """
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   416
    if not isinstance(password, basestring):
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   417
        raise TypeError('Password is not a string: %r' % password)
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   418
    if isinstance(password, unicode):
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   419
        password = password.encode(ENCODING)
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   420
    password = password.strip()
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   421
    if not password:
417
8209da83e256 VMM: Updated some messages. (doesn't, isn't) -> (does not, is not)
Pascal Volk <neverseen@users.sourceforge.net>
parents: 366
diff changeset
   422
        raise ValueError("Could not accept empty password.")
268
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   423
    if scheme is None:
272
446483386914 VMM/Config: Added method Config.install() -> global cfg_dget().
Pascal Volk <neverseen@users.sourceforge.net>
parents: 268
diff changeset
   424
        scheme = cfg_dget('misc.password_scheme')
287
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   425
    scheme, encoding = verify_scheme(scheme)
268
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   426
    if scheme == 'DIGEST-MD5':
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   427
        assert isinstance(user, EmailAddress)
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   428
        return _md5_hash(password, scheme, encoding, user)
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   429
    return _scheme_info[scheme][0](password, scheme, encoding)
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   430
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   431
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   432
def randompw():
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   433
    """Generates a plain text random password.
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   434
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   435
    The length of the password can be configured in the ``vmm.cfg``
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   436
    (account.password_length).
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   437
    """
272
446483386914 VMM/Config: Added method Config.install() -> global cfg_dget().
Pascal Volk <neverseen@users.sourceforge.net>
parents: 268
diff changeset
   438
    pw_len = cfg_dget('account.password_length')
268
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   439
    if pw_len < 8:
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   440
        pw_len = 8
284
ec1966828246 VMM/password: Added support Blowfish/SHA-256/SHA-512 crypt().
Pascal Volk <neverseen@users.sourceforge.net>
parents: 274
diff changeset
   441
    return ''.join(_sys_rand.sample(PASSWDCHARS, pw_len))
268
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   442
291
7ef3f117a230 VMM/password: adapted Blowfish/SHA-256/SHA-512 crypt() to recent
Pascal Volk <neverseen@users.sourceforge.net>
parents: 290
diff changeset
   443
7ef3f117a230 VMM/password: adapted Blowfish/SHA-256/SHA-512 crypt() to recent
Pascal Volk <neverseen@users.sourceforge.net>
parents: 290
diff changeset
   444
def _test_crypt_algorithms():
7ef3f117a230 VMM/password: adapted Blowfish/SHA-256/SHA-512 crypt() to recent
Pascal Volk <neverseen@users.sourceforge.net>
parents: 290
diff changeset
   445
    """Check for Blowfish/SHA-256/SHA-512 support in crypt.crypt()."""
7ef3f117a230 VMM/password: adapted Blowfish/SHA-256/SHA-512 crypt() to recent
Pascal Volk <neverseen@users.sourceforge.net>
parents: 290
diff changeset
   446
    _blowfish = '$2a$04$0123456789abcdefABCDE.N.drYX5yIAL1LkTaaZotW3yI0hQhZru'
7ef3f117a230 VMM/password: adapted Blowfish/SHA-256/SHA-512 crypt() to recent
Pascal Volk <neverseen@users.sourceforge.net>
parents: 290
diff changeset
   447
    _sha256 = '$5$rounds=1000$0123456789abcdef$K/DksR0DT01hGc8g/kt9McEgrbFMKi\
7ef3f117a230 VMM/password: adapted Blowfish/SHA-256/SHA-512 crypt() to recent
Pascal Volk <neverseen@users.sourceforge.net>
parents: 290
diff changeset
   448
9qrb1jehe7hn4'
7ef3f117a230 VMM/password: adapted Blowfish/SHA-256/SHA-512 crypt() to recent
Pascal Volk <neverseen@users.sourceforge.net>
parents: 290
diff changeset
   449
    _sha512 = '$6$rounds=1000$0123456789abcdef$ZIAd5WqfyLkpvsVCVUU1GrvqaZTqvh\
7ef3f117a230 VMM/password: adapted Blowfish/SHA-256/SHA-512 crypt() to recent
Pascal Volk <neverseen@users.sourceforge.net>
parents: 290
diff changeset
   450
JoouxdSqJO71l9Ld3tVrfOatEjarhghvEYADkq//LpDnTeO90tcbtHR1'
7ef3f117a230 VMM/password: adapted Blowfish/SHA-256/SHA-512 crypt() to recent
Pascal Volk <neverseen@users.sourceforge.net>
parents: 290
diff changeset
   451
7ef3f117a230 VMM/password: adapted Blowfish/SHA-256/SHA-512 crypt() to recent
Pascal Volk <neverseen@users.sourceforge.net>
parents: 290
diff changeset
   452
    if crypt('08/15!test~4711', '$2a$04$0123456789abcdefABCDEF$') == _blowfish:
7ef3f117a230 VMM/password: adapted Blowfish/SHA-256/SHA-512 crypt() to recent
Pascal Volk <neverseen@users.sourceforge.net>
parents: 290
diff changeset
   453
        _scheme_info['BLF-CRYPT'] = (_crypt_hash, 0x10000f00)
7ef3f117a230 VMM/password: adapted Blowfish/SHA-256/SHA-512 crypt() to recent
Pascal Volk <neverseen@users.sourceforge.net>
parents: 290
diff changeset
   454
    if crypt('08/15!test~4711', '$5$rounds=1000$0123456789abcdef$') == _sha256:
7ef3f117a230 VMM/password: adapted Blowfish/SHA-256/SHA-512 crypt() to recent
Pascal Volk <neverseen@users.sourceforge.net>
parents: 290
diff changeset
   455
        _scheme_info['SHA256-CRYPT'] = (_crypt_hash, 0x10000f00)
7ef3f117a230 VMM/password: adapted Blowfish/SHA-256/SHA-512 crypt() to recent
Pascal Volk <neverseen@users.sourceforge.net>
parents: 290
diff changeset
   456
    if crypt('08/15!test~4711', '$6$rounds=1000$0123456789abcdef$') == _sha512:
7ef3f117a230 VMM/password: adapted Blowfish/SHA-256/SHA-512 crypt() to recent
Pascal Volk <neverseen@users.sourceforge.net>
parents: 290
diff changeset
   457
        _scheme_info['SHA512-CRYPT'] = (_crypt_hash, 0x10000f00)
7ef3f117a230 VMM/password: adapted Blowfish/SHA-256/SHA-512 crypt() to recent
Pascal Volk <neverseen@users.sourceforge.net>
parents: 290
diff changeset
   458
7ef3f117a230 VMM/password: adapted Blowfish/SHA-256/SHA-512 crypt() to recent
Pascal Volk <neverseen@users.sourceforge.net>
parents: 290
diff changeset
   459
_test_crypt_algorithms()
284
ec1966828246 VMM/password: Added support Blowfish/SHA-256/SHA-512 crypt().
Pascal Volk <neverseen@users.sourceforge.net>
parents: 274
diff changeset
   460
del _, cfg_dget, _test_crypt_algorithms