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annotate roundup/password.py @ 4945:55aef7ab35a8

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Increase default height of classhelp windows from 400 to 600. If classhelp popup windows are really opened in a separate browser window instead of just a new tab, the window size is often too small, especially when the search frame for finding usernames is displayed. The original size was introduced in 2002 and might have been meant for 640x480 resolutions and the new size might still be too small for many use cases, but this conservative/small increase should not hurt people with small displays.
author Thomas Arendsen Hein <thomas@intevation.de>
date Tue, 25 Nov 2014 16:31:06 +0100
parents efdce3d32698
children 9ba03348f923
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 base64 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=12):
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169 chars = string.letters+string.digits
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170 password = [random.choice(chars) for x in range(length)]
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171 # make sure there is at least one digit
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172 password[0] = random.choice(string.digits)
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173 random.shuffle(password)
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174 return ''.join(password)
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175
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176 class JournalPassword:
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177 """ Password dummy instance intended for journal operation.
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178 We do not store passwords in the journal any longer. The dummy
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179 version only reads the encryption scheme from the given
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180 encrypted password.
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181 """
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182 default_scheme = 'PBKDF2' # new encryptions use this scheme
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183 pwre = re.compile(r'{(\w+)}(.+)')
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184
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185 def __init__ (self, encrypted=''):
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186 if isinstance(encrypted, self.__class__):
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187 self.scheme = encrypted.scheme or self.default_scheme
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188 else:
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189 m = self.pwre.match(encrypted)
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190 if m:
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191 self.scheme = m.group(1)
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192 else:
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193 self.scheme = self.default_scheme
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194 self.password = ''
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195
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196 def dummystr(self):
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197 """ return dummy string to store in journal
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198 - reports scheme, but nothing else
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199 """
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200 return "{%s}*encrypted*" % (self.scheme,)
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201
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202 __str__ = dummystr
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203
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204 def __cmp__(self, other):
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205 """Compare this password against another password."""
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206 # check to see if we're comparing instances
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207 if isinstance(other, self.__class__):
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208 if self.scheme != other.scheme:
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209 return cmp(self.scheme, other.scheme)
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210 return cmp(self.password, other.password)
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211
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212 # assume password is plaintext
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213 if self.password is None:
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214 raise ValueError, 'Password not set'
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215 return cmp(self.password, encodePassword(other, self.scheme,
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diff changeset
216 self.password or None))
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217
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218 class Password(JournalPassword):
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219 """The class encapsulates a Password property type value in the database.
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220
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diff changeset
221 The encoding of the password is one if None, 'SHA', 'MD5' or 'plaintext'.
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diff changeset
222 The encodePassword function is used to actually encode the password from
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diff changeset
223 plaintext. The None encoding is used in legacy databases where no
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diff changeset
224 encoding scheme is identified.
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225
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226 The scheme is stored with the encoded data in the database:
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diff changeset
227 {scheme}data
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228
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diff changeset
229 Example usage:
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230 >>> p = Password('sekrit')
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diff changeset
231 >>> p == 'sekrit'
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232 1
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diff changeset
233 >>> p != 'not sekrit'
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diff changeset
234 1
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diff changeset
235 >>> 'sekrit' == p
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236 1
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diff changeset
237 >>> 'not sekrit' != p
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238 1
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diff changeset
239 """
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240 #TODO: code to migrate from old password schemes.
270
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diff changeset
241
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diff changeset
242 deprecated_schemes = ["SHA", "MD5", "crypt", "plaintext"]
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diff changeset
243 known_schemes = ["PBKDF2"] + deprecated_schemes
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244
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245 def __init__(self, plaintext=None, scheme=None, encrypted=None, strict=False, config=None):
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246 """Call setPassword if plaintext is not None."""
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247 if scheme is None:
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248 scheme = self.default_scheme
270
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249 if plaintext is not None:
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250 self.setPassword (plaintext, scheme, config=config)
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diff changeset
251 elif encrypted is not None:
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252 self.unpack(encrypted, scheme, strict=strict, config=config)
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253 else:
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diff changeset
254 self.scheme = self.default_scheme
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255 self.password = None
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256 self.plaintext = None
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257
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diff changeset
258 def needs_migration(self):
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259 """ Password has insecure scheme or other insecure parameters
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diff changeset
260 and needs migration to new password scheme
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diff changeset
261 """
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diff changeset
262 if self.scheme in self.deprecated_schemes:
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263 return True
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264 rounds, salt, raw_salt, digest = pbkdf2_unpack(self.password)
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265 if rounds < 1000:
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266 return True
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267 return False
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268
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269 def unpack(self, encrypted, scheme=None, strict=False, config=None):
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270 """Set the password info from the scheme:<encryted info> string
270
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271 (the inverse of __str__)
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272 """
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273 m = self.pwre.match(encrypted)
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274 if m:
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275 self.scheme = m.group(1)
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276 self.password = m.group(2)
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277 self.plaintext = None
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278 else:
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279 # currently plaintext - encrypt
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280 self.setPassword(encrypted, scheme, config=config)
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281 if strict and self.scheme not in self.known_schemes:
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282 raise PasswordValueError, "Unknown encryption scheme: %r" % (self.scheme,)
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283
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284 def setPassword(self, plaintext, scheme=None, config=None):
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285 """Sets encrypts plaintext."""
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286 if scheme is None:
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287 scheme = self.default_scheme
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288 self.scheme = scheme
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289 self.password = encodePassword(plaintext, scheme, config=config)
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290 self.plaintext = plaintext
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291
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292 def __str__(self):
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293 """Stringify the encrypted password for database storage."""
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294 if self.password is None:
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295 raise ValueError, 'Password not set'
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296 return '{%s}%s'%(self.scheme, self.password)
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297
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298 def test():
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299 # SHA
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300 p = Password('sekrit')
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301 assert p == 'sekrit'
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302 assert p != 'not sekrit'
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303 assert 'sekrit' == p
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304 assert 'not sekrit' != p
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305
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306 # MD5
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307 p = Password('sekrit', 'MD5')
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308 assert p == 'sekrit'
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309 assert p != 'not sekrit'
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310 assert 'sekrit' == p
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311 assert 'not sekrit' != p
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312
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313 # crypt
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314 if crypt: # not available on Windows
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315 p = Password('sekrit', 'crypt')
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316 assert p == 'sekrit'
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317 assert p != 'not sekrit'
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318 assert 'sekrit' == p
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319 assert 'not sekrit' != p
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320
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321 # PBKDF2 - low level function
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322 from binascii import unhexlify
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323 k = pbkdf2("password", "ATHENA.MIT.EDUraeburn", 1200, 32)
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324 assert k == unhexlify("5c08eb61fdf71e4e4ec3cf6ba1f5512ba7e52ddbc5e5142f708a31e2e62b1e13")
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325
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326 # PBKDF2 - hash function
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327 h = "5000$7BvbBq.EZzz/O0HuwX3iP.nAG3s$g3oPnFFaga2BJaX5PoPRljl4XIE"
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328 assert encodePassword("sekrit", "PBKDF2", h) == h
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329
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330 # PBKDF2 - high level integration
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331 p = Password('sekrit', 'PBKDF2')
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332 assert p == 'sekrit'
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333 assert p != 'not sekrit'
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334 assert 'sekrit' == p
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335 assert 'not sekrit' != p
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336
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337 if __name__ == '__main__':
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338 test()
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339
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340 # vim: set filetype=python sts=4 sw=4 et si :
Roundup Issue Tracker: http://roundup-tracker.org/