VirtualMailManager/password.py
author martin f. krafft <madduck@madduck.net>
Tue, 10 Apr 2012 22:56:30 +0200
branchv0.6.x
changeset 514 d863a44a6353
parent 464 7d4d79ff08d0
child 568 14abdd04ddf5
permissions -rw-r--r--
Make PL/pgSQL function feed back identity for mailboxes/relocated when there are catchall destinations. Without catchall aliases, if no virtual_alias matches, the query can just return NULL and Postfix will later check mailboxes/relocated for the address to rewrite. However, since virtual aliases are handled long before mailboxes/relocated, a catchall alias would also catch mail to mailboxes and relocated addresses, which we do not want. The way to tell postfix to keep delivering is for the virtual alias map to return the search key itself (identity function). This patch changes the postfix_virtual_alias_maps Pl/pgSQL function to do exactly that, but only if there are catchall destinations defined for the domain in question — otherwise it returns NULL when no match is found.
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# -*- coding: UTF-8 -*-
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# Copyright (c) 2010 - 2011, 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$%s' % (CRYPT_ID_BLF, rounds,
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                            _get_salt(CRYPT_BLF_SALT_LEN))
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291
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def _get_crypt_sha2_salt(crypt_id):
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    """Generates a salt for crypt using the SHA-256 or SHA-512 encryption
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    method.
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    *crypt_id* must be either `5` (SHA-256) or `6` (SHA-512).
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    """
292
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    assert crypt_id in (CRYPT_ID_SHA256, CRYPT_ID_SHA512), 'invalid crypt ' \
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           'id: %r' % crypt_id
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    if crypt_id is CRYPT_ID_SHA512:
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        rounds = cfg_dget('misc.crypt_sha512_rounds')
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    else:
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        rounds = cfg_dget('misc.crypt_sha256_rounds')
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    if rounds < CRYPT_SHA2_ROUNDS_MIN:
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        rounds = CRYPT_SHA2_ROUNDS_MIN
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    elif rounds > CRYPT_SHA2_ROUNDS_MAX:
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        rounds = CRYPT_SHA2_ROUNDS_MAX
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    if rounds == CRYPT_SHA2_ROUNDS_DEFAULT:
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        return '$%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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   234
            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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    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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        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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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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    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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diff changeset
   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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diff changeset
   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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diff changeset
   291
        digest = (sha1.digest() + salt).encode('base64').rstrip()
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diff changeset
   292
    else:
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diff changeset
   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
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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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
619dadc0fd25 VMM/password: added some CRYPT_* constants.
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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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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:
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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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),
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   340
    'SHA': (_sha1_hash, 0x10000f00),
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   341
    'SHA1': (_sha1_hash, 0x10000f00),
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   342
    'SHA256': (_sha256_hash, 0x10100a01),
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   343
    'SHA512': (_sha512_hash, 0x20000b03),
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   344
    'SKEY': (_dovecotpw, 0x10100a01),
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parents:
diff changeset
   345
    'SMD5': (_smd5_hash, 0x10000f00),
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parents:
diff changeset
   346
    'SSHA': (_ssha1_hash, 0x10000f00),
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parents:
diff changeset
   347
    'SSHA256': (_ssha256_hash, 0x10200a04),
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parents:
diff changeset
   348
    'SSHA512': (_ssha512_hash, 0x20000b03),
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parents:
diff changeset
   349
}
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parents:
diff changeset
   350
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
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parents:
diff changeset
   351
461
cabdf94ec580 VMM/password: Added function list_schemes().
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parents: 417
diff changeset
   352
def list_schemes():
cabdf94ec580 VMM/password: Added function list_schemes().
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parents: 417
diff changeset
   353
    """Returns the tuple (schemes, encodings).
cabdf94ec580 VMM/password: Added function list_schemes().
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parents: 417
diff changeset
   354
cabdf94ec580 VMM/password: Added function list_schemes().
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parents: 417
diff changeset
   355
    `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
   356
    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
   357
    `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
   358
    be empty.
cabdf94ec580 VMM/password: Added function list_schemes().
Pascal Volk <neverseen@users.sourceforge.net>
parents: 417
diff changeset
   359
    """
cabdf94ec580 VMM/password: Added function list_schemes().
Pascal Volk <neverseen@users.sourceforge.net>
parents: 417
diff changeset
   360
    dcv = cfg_dget('misc.dovecot_version')
cabdf94ec580 VMM/password: Added function list_schemes().
Pascal Volk <neverseen@users.sourceforge.net>
parents: 417
diff changeset
   361
    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
   362
    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
   363
        encodings = ('.B64', '.BASE64', '.HEX')
461
cabdf94ec580 VMM/password: Added function list_schemes().
Pascal Volk <neverseen@users.sourceforge.net>
parents: 417
diff changeset
   364
    else:
cabdf94ec580 VMM/password: Added function list_schemes().
Pascal Volk <neverseen@users.sourceforge.net>
parents: 417
diff changeset
   365
        encodings = ()
cabdf94ec580 VMM/password: Added function list_schemes().
Pascal Volk <neverseen@users.sourceforge.net>
parents: 417
diff changeset
   366
    return schemes, encodings
cabdf94ec580 VMM/password: Added function list_schemes().
Pascal Volk <neverseen@users.sourceforge.net>
parents: 417
diff changeset
   367
cabdf94ec580 VMM/password: Added function list_schemes().
Pascal Volk <neverseen@users.sourceforge.net>
parents: 417
diff changeset
   368
287
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   369
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
   370
    """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
   371
    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
   372
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   373
    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
   374
    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
   375
    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
   376
    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
   377
    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
   378
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   379
    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
   380
      * is unknown
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   381
      * 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
   382
      * 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
   383
    """
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   384
    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
   385
    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
   386
    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
   387
    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
   388
        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
   389
                       VMM_ERROR)
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   390
    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
   391
        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
   392
                         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
   393
                       '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
   394
                       VMM_ERROR)
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   395
    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
   396
        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
   397
            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
   398
                             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
   399
        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
   400
            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
   401
                           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
   402
        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
   403
    else:
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   404
        encoding = None
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   405
    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
   406
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
Pascal Volk <neverseen@users.sourceforge.net>
parents: 284
diff changeset
   407
268
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   408
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
   409
    """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
   410
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   411
    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
   412
    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
   413
    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
   414
    """
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   415
    if not isinstance(password, basestring):
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   416
        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
   417
    if isinstance(password, unicode):
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   418
        password = password.encode(ENCODING)
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   419
    password = password.strip()
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   420
    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
   421
        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
   422
    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
   423
        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
   424
    scheme, encoding = verify_scheme(scheme)
268
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   425
    if scheme == 'DIGEST-MD5':
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   426
        assert isinstance(user, EmailAddress)
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   427
        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
   428
    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
   429
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
def randompw():
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   432
    """Generates a plain text random password.
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   433
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   434
    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
   435
    (account.password_length).
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   436
    """
272
446483386914 VMM/Config: Added method Config.install() -> global cfg_dget().
Pascal Volk <neverseen@users.sourceforge.net>
parents: 268
diff changeset
   437
    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
   438
    if pw_len < 8:
beb8f4421f92 VMM: added new modules password and pycompat.hashlib.
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   439
        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
   440
    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
   441
291
7ef3f117a230 VMM/password: adapted Blowfish/SHA-256/SHA-512 crypt() to recent
Pascal Volk <neverseen@users.sourceforge.net>
parents: 290
diff changeset
   442
7ef3f117a230 VMM/password: adapted Blowfish/SHA-256/SHA-512 crypt() to recent
Pascal Volk <neverseen@users.sourceforge.net>
parents: 290
diff changeset
   443
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
   444
    """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
   445
    _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
   446
    _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
   447
9qrb1jehe7hn4'
7ef3f117a230 VMM/password: adapted Blowfish/SHA-256/SHA-512 crypt() to recent
Pascal Volk <neverseen@users.sourceforge.net>
parents: 290
diff changeset
   448
    _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
   449
JoouxdSqJO71l9Ld3tVrfOatEjarhghvEYADkq//LpDnTeO90tcbtHR1'
7ef3f117a230 VMM/password: adapted Blowfish/SHA-256/SHA-512 crypt() to recent
Pascal Volk <neverseen@users.sourceforge.net>
parents: 290
diff changeset
   450
7ef3f117a230 VMM/password: adapted Blowfish/SHA-256/SHA-512 crypt() to recent
Pascal Volk <neverseen@users.sourceforge.net>
parents: 290
diff changeset
   451
    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
   452
        _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
   453
    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
   454
        _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
   455
    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
   456
        _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
   457
7ef3f117a230 VMM/password: adapted Blowfish/SHA-256/SHA-512 crypt() to recent
Pascal Volk <neverseen@users.sourceforge.net>
parents: 290
diff changeset
   458
_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
   459
del _, cfg_dget, _test_crypt_algorithms