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annotate roundup/password.py @ 4587:a2eb4fb3e6d8

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New Chameleon templating engine, engine is now configurable. We now have two configurable templating engines, the old Zope TAL templates (called zopetal in the config) and the new Chameleon (called chameleon in the config). A new config-option "template_engine" under [main] can take these config-options, the default is zopetal. Thanks to Cheer Xiao for the idea of making this configurable *and* for the actual implementation! Cheer Xiao commit log: - The original TAL engine ported from Zope is thereafter referred to as "zopetal", in speech and in code - A new option "template_engine" under [main] introduced - Zopetal-specific code stripped from cgi/templating.py to form the new cgi/engine_zopetal.py - Interface to Chameleon in cgi/engine_chameleon.py - Engines are supposed to provide a Templates class that mimics the behavior of the old cgi.templating.Templates. The Templates class is preferably subclassed from cgi.templating.TemplatesBase. - New function cgi.templating.get_templates to get the appropriate engine's Templates instance according to the engine name
author Ralf Schlatterbeck <rsc@runtux.com>
date Thu, 23 Feb 2012 18:10:03 +0100
parents 6e3e4f24c753
children 2f66d44616ad
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1 #
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2 # Copyright (c) 2001 Bizar Software Pty Ltd (http://www.bizarsoftware.com.au/)
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3 # This module is free software, and you may redistribute it and/or modify
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4 # under the same terms as Python, so long as this copyright message and
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5 # disclaimer are retained in their original form.
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6 #
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7 # IN NO EVENT SHALL BIZAR SOFTWARE PTY LTD BE LIABLE TO ANY PARTY FOR
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8 # DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING
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9 # OUT OF THE USE OF THIS CODE, EVEN IF THE AUTHOR HAS BEEN ADVISED OF THE
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10 # POSSIBILITY OF SUCH DAMAGE.
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11 #
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12 # BIZAR SOFTWARE PTY LTD SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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13 # BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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14 # FOR A PARTICULAR PURPOSE. THE CODE PROVIDED HEREUNDER IS ON AN "AS IS"
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15 # BASIS, AND THERE IS NO OBLIGATION WHATSOEVER TO PROVIDE MAINTENANCE,
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16 # SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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17 #
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18 """Password handling (encoding, decoding).
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19 """
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20 __docformat__ = 'restructuredtext'
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21
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22 import re, string, random
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23 from base64 import b64encode, b64decode
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24 from roundup.anypy.hashlib_ import md5, sha1, shamodule
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25 try:
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26 import crypt
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27 except ImportError:
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28 crypt = None
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29
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30 _bempty = ""
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31 _bjoin = _bempty.join
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32
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33 def getrandbytes(count):
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34 return _bjoin(chr(random.randint(0,255)) for i in xrange(count))
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35
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36 #NOTE: PBKDF2 hash is using this variant of base64 to minimize encoding size,
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37 # and have charset that's compatible w/ unix crypt variants
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38 def h64encode(data):
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39 """encode using variant of base64"""
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40 return b64encode(data, "./").strip("=\n")
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41
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42 def h64decode(data):
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43 """decode using variant of base64"""
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44 off = len(data) % 4
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45 if off == 0:
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46 return b64decode(data, "./")
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47 elif off == 1:
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48 raise ValueError("invalid bas64 input")
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49 elif off == 2:
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50 return b64decode(data + "==", "./")
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51 else:
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52 return b64decode(data + "=", "./")
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53
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54 try:
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55 from M2Crypto.EVP import pbkdf2 as _pbkdf2
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56 except ImportError:
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57 #no m2crypto - make our own pbkdf2 function
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58 from struct import pack
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59 from hmac import HMAC
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60
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61 def xor_bytes(left, right):
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62 "perform bitwise-xor of two byte-strings"
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63 return _bjoin(chr(ord(l) ^ ord(r)) for l, r in zip(left, right))
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64
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65 def _pbkdf2(password, salt, rounds, keylen):
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66 digest_size = 20 # sha1 generates 20-byte blocks
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67 total_blocks = int((keylen+digest_size-1)/digest_size)
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68 hmac_template = HMAC(password, None, shamodule)
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69 out = _bempty
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70 for i in xrange(1, total_blocks+1):
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71 hmac = hmac_template.copy()
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72 hmac.update(salt + pack(">L",i))
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73 block = tmp = hmac.digest()
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74 for j in xrange(rounds-1):
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75 hmac = hmac_template.copy()
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76 hmac.update(tmp)
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77 tmp = hmac.digest()
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78 #TODO: need to speed up this call
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79 block = xor_bytes(block, tmp)
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80 out += block
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81 return out[:keylen]
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82
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83 def pbkdf2(password, salt, rounds, keylen):
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84 """pkcs#5 password-based key derivation v2.0
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85
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86 :arg password: passphrase to use to generate key (if unicode, converted to utf-8)
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87 :arg salt: salt string to use when generating key (if unicode, converted to utf-8)
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88 :param rounds: number of rounds to use to generate key
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89 :arg keylen: number of bytes to generate
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90
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91 If M2Crypto is present, uses it's implementation as backend.
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92
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93 :returns:
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94 raw bytes of generated key
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95 """
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96 if isinstance(password, unicode):
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97 password = password.encode("utf-8")
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98 if isinstance(salt, unicode):
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99 salt = salt.encode("utf-8")
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100 if keylen > 40:
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101 #NOTE: pbkdf2 allows up to (2**31-1)*20 bytes,
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102 # but m2crypto has issues on some platforms above 40,
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103 # and such sizes aren't needed for a password hash anyways...
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104 raise ValueError, "key length too large"
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105 if rounds < 1:
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106 raise ValueError, "rounds must be positive number"
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107 return _pbkdf2(password, salt, rounds, keylen)
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108
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109 class PasswordValueError(ValueError):
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110 """ The password value is not valid """
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111 pass
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112
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113 def pbkdf2_unpack(pbkdf2):
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114 """ unpack pbkdf2 encrypted password into parts,
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115 assume it has format "{rounds}${salt}${digest}
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116 """
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117 if isinstance(pbkdf2, unicode):
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118 pbkdf2 = pbkdf2.encode("ascii")
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119 try:
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120 rounds, salt, digest = pbkdf2.split("$")
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121 except ValueError:
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122 raise PasswordValueError, "invalid PBKDF2 hash (wrong number of separators)"
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123 if rounds.startswith("0"):
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124 raise PasswordValueError, "invalid PBKDF2 hash (zero-padded rounds)"
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125 try:
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126 rounds = int(rounds)
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127 except ValueError:
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128 raise PasswordValueError, "invalid PBKDF2 hash (invalid rounds)"
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129 raw_salt = h64decode(salt)
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130 return rounds, salt, raw_salt, digest
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131
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132 def encodePassword(plaintext, scheme, other=None, config=None):
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133 """Encrypt the plaintext password.
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134 """
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135 if plaintext is None:
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136 plaintext = ""
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137 if scheme == "PBKDF2":
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138 if other:
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139 rounds, salt, raw_salt, digest = pbkdf2_unpack(other)
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140 else:
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141 raw_salt = getrandbytes(20)
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142 salt = h64encode(raw_salt)
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143 if config:
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144 rounds = config.PASSWORD_PBKDF2_DEFAULT_ROUNDS
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145 else:
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146 rounds = 10000
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147 if rounds < 1000:
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148 raise PasswordValueError, "invalid PBKDF2 hash (rounds too low)"
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149 raw_digest = pbkdf2(plaintext, raw_salt, rounds, 20)
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150 return "%d$%s$%s" % (rounds, salt, h64encode(raw_digest))
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151 elif scheme == 'SHA':
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152 s = sha1(plaintext).hexdigest()
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153 elif scheme == 'MD5':
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154 s = md5(plaintext).hexdigest()
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155 elif scheme == 'crypt' and crypt is not None:
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156 if other is not None:
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157 salt = other
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158 else:
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159 saltchars = './0123456789'+string.letters
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160 salt = random.choice(saltchars) + random.choice(saltchars)
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161 s = crypt.crypt(plaintext, salt)
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162 elif scheme == 'plaintext':
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163 s = plaintext
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164 else:
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165 raise PasswordValueError, 'unknown encryption scheme %r'%scheme
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166 return s
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167
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168 def generatePassword(length=8):
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169 chars = string.letters+string.digits
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170 return ''.join([random.choice(chars) for x in range(length)])
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171
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172 class JournalPassword:
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173 """ Password dummy instance intended for journal operation.
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174 We do not store passwords in the journal any longer. The dummy
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175 version only reads the encryption scheme from the given
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176 encrypted password.
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177 """
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178 default_scheme = 'PBKDF2' # new encryptions use this scheme
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179 pwre = re.compile(r'{(\w+)}(.+)')
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180
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181 def __init__ (self, encrypted=''):
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182 if isinstance(encrypted, self.__class__):
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183 self.scheme = encrypted.scheme or self.default_scheme
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184 else:
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185 m = self.pwre.match(encrypted)
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186 if m:
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187 self.scheme = m.group(1)
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188 else:
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189 self.scheme = self.default_scheme
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190 self.password = ''
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191
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192 def dummystr(self):
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193 """ return dummy string to store in journal
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194 - reports scheme, but nothing else
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195 """
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196 return "{%s}*encrypted*" % (self.scheme,)
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197
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198 __str__ = dummystr
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199
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200 def __cmp__(self, other):
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201 """Compare this password against another password."""
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202 # check to see if we're comparing instances
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203 if isinstance(other, self.__class__):
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204 if self.scheme != other.scheme:
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205 return cmp(self.scheme, other.scheme)
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206 return cmp(self.password, other.password)
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207
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208 # assume password is plaintext
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209 if self.password is None:
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210 raise ValueError, 'Password not set'
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211 return cmp(self.password, encodePassword(other, self.scheme,
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212 self.password or None))
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213
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214 class Password(JournalPassword):
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215 """The class encapsulates a Password property type value in the database.
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216
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217 The encoding of the password is one if None, 'SHA', 'MD5' or 'plaintext'.
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218 The encodePassword function is used to actually encode the password from
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219 plaintext. The None encoding is used in legacy databases where no
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220 encoding scheme is identified.
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221
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222 The scheme is stored with the encoded data in the database:
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223 {scheme}data
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224
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225 Example usage:
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226 >>> p = Password('sekrit')
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227 >>> p == 'sekrit'
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228 1
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229 >>> p != 'not sekrit'
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230 1
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231 >>> 'sekrit' == p
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232 1
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233 >>> 'not sekrit' != p
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234 1
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235 """
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236 #TODO: code to migrate from old password schemes.
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237
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238 deprecated_schemes = ["SHA", "MD5", "crypt", "plaintext"]
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239 known_schemes = ["PBKDF2"] + deprecated_schemes
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240
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241 def __init__(self, plaintext=None, scheme=None, encrypted=None, strict=False, config=None):
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242 """Call setPassword if plaintext is not None."""
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243 if scheme is None:
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244 scheme = self.default_scheme
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245 if plaintext is not None:
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246 self.setPassword (plaintext, scheme, config=config)
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247 elif encrypted is not None:
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248 self.unpack(encrypted, scheme, strict=strict, config=config)
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249 else:
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250 self.scheme = self.default_scheme
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251 self.password = None
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252 self.plaintext = None
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253
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254 def needs_migration(self):
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255 """ Password has insecure scheme or other insecure parameters
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diff changeset
256 and needs migration to new password scheme
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257 """
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diff changeset
258 if self.scheme in self.deprecated_schemes:
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259 return True
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260 rounds, salt, raw_salt, digest = pbkdf2_unpack(self.password)
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261 if rounds < 1000:
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262 return True
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263 return False
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264
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265 def unpack(self, encrypted, scheme=None, strict=False, config=None):
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266 """Set the password info from the scheme:<encryted info> string
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267 (the inverse of __str__)
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268 """
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269 m = self.pwre.match(encrypted)
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270 if m:
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271 self.scheme = m.group(1)
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272 self.password = m.group(2)
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273 self.plaintext = None
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274 else:
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275 # currently plaintext - encrypt
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276 self.setPassword(encrypted, scheme, config=config)
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277 if strict and self.scheme not in self.known_schemes:
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278 raise PasswordValueError, "unknown encryption scheme: %r" % (self.scheme,)
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279
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280 def setPassword(self, plaintext, scheme=None, config=None):
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281 """Sets encrypts plaintext."""
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282 if scheme is None:
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283 scheme = self.default_scheme
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284 self.scheme = scheme
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285 self.password = encodePassword(plaintext, scheme, config=config)
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286 self.plaintext = plaintext
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287
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288 def __str__(self):
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289 """Stringify the encrypted password for database storage."""
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290 if self.password is None:
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291 raise ValueError, 'Password not set'
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292 return '{%s}%s'%(self.scheme, self.password)
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293
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294 def test():
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295 # SHA
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296 p = Password('sekrit')
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297 assert p == 'sekrit'
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298 assert p != 'not sekrit'
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299 assert 'sekrit' == p
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300 assert 'not sekrit' != p
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301
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302 # MD5
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303 p = Password('sekrit', 'MD5')
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304 assert p == 'sekrit'
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305 assert p != 'not sekrit'
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306 assert 'sekrit' == p
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307 assert 'not sekrit' != p
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308
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309 # crypt
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310 p = Password('sekrit', 'crypt')
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311 assert p == 'sekrit'
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312 assert p != 'not sekrit'
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313 assert 'sekrit' == p
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314 assert 'not sekrit' != p
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315
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316 # PBKDF2 - low level function
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317 from binascii import unhexlify
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318 k = pbkdf2("password", "ATHENA.MIT.EDUraeburn", 1200, 32)
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319 assert k == unhexlify("5c08eb61fdf71e4e4ec3cf6ba1f5512ba7e52ddbc5e5142f708a31e2e62b1e13")
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320
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321 # PBKDF2 - hash function
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322 h = "5000$7BvbBq.EZzz/O0HuwX3iP.nAG3s$g3oPnFFaga2BJaX5PoPRljl4XIE"
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323 assert encodePassword("sekrit", "PBKDF2", h) == h
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324
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325 # PBKDF2 - high level integration
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326 p = Password('sekrit', 'PBKDF2')
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327 assert p == 'sekrit'
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328 assert p != 'not sekrit'
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329 assert 'sekrit' == p
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330 assert 'not sekrit' != p
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331
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332 if __name__ == '__main__':
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333 test()
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334
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335 # vim: set filetype=python sts=4 sw=4 et si :
Roundup Issue Tracker: http://roundup-tracker.org/