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annotate roundup/password.py @ 5010:0428d2004a86

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Fix exception handling to be python2.5 compatible The exception handling introduced in commit hg:494d2550: Display errors containing HTML with RejectRaw (issue2550847) contained the new style of exception handling that is not compatible with python2.5. Rework these exception handlers to use the old style to maintain compatibility with python2.5
author John Kristensen <john@jerrykan.com>
date Wed, 06 Jan 2016 16:02:34 +1100
parents 9ba03348f923
children 9792b18e0b19
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 hashlib import md5, sha1
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25
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26 try:
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27 import crypt
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28 except ImportError:
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29 crypt = None
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30
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31 _bempty = ""
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32 _bjoin = _bempty.join
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33
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34 def getrandbytes(count):
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35 return _bjoin(chr(random.randint(0,255)) for i in xrange(count))
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36
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37 #NOTE: PBKDF2 hash is using this variant of base64 to minimize encoding size,
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38 # and have charset that's compatible w/ unix crypt variants
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39 def h64encode(data):
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40 """encode using variant of base64"""
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41 return b64encode(data, "./").strip("=\n")
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42
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43 def h64decode(data):
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44 """decode using variant of base64"""
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45 off = len(data) % 4
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46 if off == 0:
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47 return b64decode(data, "./")
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48 elif off == 1:
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49 raise ValueError("Invalid base64 input")
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50 elif off == 2:
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51 return b64decode(data + "==", "./")
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52 else:
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53 return b64decode(data + "=", "./")
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54
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55 try:
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56 from M2Crypto.EVP import pbkdf2 as _pbkdf2
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57 except ImportError:
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58 #no m2crypto - make our own pbkdf2 function
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59 from struct import pack
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60 from hmac import HMAC
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61
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62 def xor_bytes(left, right):
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63 "perform bitwise-xor of two byte-strings"
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64 return _bjoin(chr(ord(l) ^ ord(r)) for l, r in zip(left, right))
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65
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66 def _pbkdf2(password, salt, rounds, keylen):
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67 digest_size = 20 # sha1 generates 20-byte blocks
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68 total_blocks = int((keylen+digest_size-1)/digest_size)
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69 hmac_template = HMAC(password, None, sha1)
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70 out = _bempty
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71 for i in xrange(1, total_blocks+1):
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72 hmac = hmac_template.copy()
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73 hmac.update(salt + pack(">L",i))
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74 block = tmp = hmac.digest()
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75 for j in xrange(rounds-1):
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76 hmac = hmac_template.copy()
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77 hmac.update(tmp)
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78 tmp = hmac.digest()
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79 #TODO: need to speed up this call
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80 block = xor_bytes(block, tmp)
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81 out += block
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82 return out[:keylen]
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83
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84 def pbkdf2(password, salt, rounds, keylen):
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85 """pkcs#5 password-based key derivation v2.0
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86
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87 :arg password: passphrase to use to generate key (if unicode, converted to utf-8)
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88 :arg salt: salt string to use when generating key (if unicode, converted to utf-8)
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89 :param rounds: number of rounds to use to generate key
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90 :arg keylen: number of bytes to generate
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91
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92 If M2Crypto is present, uses it's implementation as backend.
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93
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94 :returns:
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95 raw bytes of generated key
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96 """
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97 if isinstance(password, unicode):
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98 password = password.encode("utf-8")
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99 if isinstance(salt, unicode):
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100 salt = salt.encode("utf-8")
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101 if keylen > 40:
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102 #NOTE: pbkdf2 allows up to (2**31-1)*20 bytes,
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103 # but m2crypto has issues on some platforms above 40,
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104 # and such sizes aren't needed for a password hash anyways...
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105 raise ValueError, "key length too large"
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106 if rounds < 1:
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107 raise ValueError, "rounds must be positive number"
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108 return _pbkdf2(password, salt, rounds, keylen)
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109
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110 class PasswordValueError(ValueError):
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111 """ The password value is not valid """
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112 pass
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113
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114 def pbkdf2_unpack(pbkdf2):
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115 """ unpack pbkdf2 encrypted password into parts,
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116 assume it has format "{rounds}${salt}${digest}
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117 """
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118 if isinstance(pbkdf2, unicode):
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119 pbkdf2 = pbkdf2.encode("ascii")
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120 try:
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121 rounds, salt, digest = pbkdf2.split("$")
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122 except ValueError:
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123 raise PasswordValueError, "invalid PBKDF2 hash (wrong number of separators)"
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124 if rounds.startswith("0"):
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125 raise PasswordValueError, "invalid PBKDF2 hash (zero-padded rounds)"
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126 try:
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127 rounds = int(rounds)
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128 except ValueError:
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129 raise PasswordValueError, "invalid PBKDF2 hash (invalid rounds)"
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130 raw_salt = h64decode(salt)
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131 return rounds, salt, raw_salt, digest
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132
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133 def encodePassword(plaintext, scheme, other=None, config=None):
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134 """Encrypt the plaintext password.
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135 """
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136 if plaintext is None:
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137 plaintext = ""
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138 if scheme == "PBKDF2":
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139 if other:
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140 rounds, salt, raw_salt, digest = pbkdf2_unpack(other)
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141 else:
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142 raw_salt = getrandbytes(20)
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143 salt = h64encode(raw_salt)
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144 if config:
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145 rounds = config.PASSWORD_PBKDF2_DEFAULT_ROUNDS
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146 else:
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147 rounds = 10000
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148 if rounds < 1000:
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149 raise PasswordValueError, "invalid PBKDF2 hash (rounds too low)"
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150 raw_digest = pbkdf2(plaintext, raw_salt, rounds, 20)
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151 return "%d$%s$%s" % (rounds, salt, h64encode(raw_digest))
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152 elif scheme == 'SHA':
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153 s = sha1(plaintext).hexdigest()
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154 elif scheme == 'MD5':
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155 s = md5(plaintext).hexdigest()
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156 elif scheme == 'crypt' and crypt is not None:
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157 if other is not None:
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158 salt = other
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159 else:
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160 saltchars = './0123456789'+string.letters
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161 salt = random.choice(saltchars) + random.choice(saltchars)
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162 s = crypt.crypt(plaintext, salt)
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163 elif scheme == 'plaintext':
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164 s = plaintext
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165 else:
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166 raise PasswordValueError, 'Unknown encryption scheme %r'%scheme
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167 return s
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168
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169 def generatePassword(length=12):
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170 chars = string.letters+string.digits
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171 password = [random.choice(chars) for x in range(length)]
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172 # make sure there is at least one digit
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173 password[0] = random.choice(string.digits)
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174 random.shuffle(password)
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175 return ''.join(password)
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176
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177 class JournalPassword:
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178 """ Password dummy instance intended for journal operation.
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179 We do not store passwords in the journal any longer. The dummy
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180 version only reads the encryption scheme from the given
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181 encrypted password.
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182 """
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183 default_scheme = 'PBKDF2' # new encryptions use this scheme
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184 pwre = re.compile(r'{(\w+)}(.+)')
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185
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186 def __init__ (self, encrypted=''):
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187 if isinstance(encrypted, self.__class__):
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188 self.scheme = encrypted.scheme or self.default_scheme
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189 else:
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190 m = self.pwre.match(encrypted)
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191 if m:
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192 self.scheme = m.group(1)
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193 else:
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194 self.scheme = self.default_scheme
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195 self.password = ''
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196
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197 def dummystr(self):
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198 """ return dummy string to store in journal
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199 - reports scheme, but nothing else
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200 """
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201 return "{%s}*encrypted*" % (self.scheme,)
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202
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203 __str__ = dummystr
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204
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205 def __cmp__(self, other):
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206 """Compare this password against another password."""
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207 # check to see if we're comparing instances
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208 if isinstance(other, self.__class__):
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209 if self.scheme != other.scheme:
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210 return cmp(self.scheme, other.scheme)
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211 return cmp(self.password, other.password)
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212
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213 # assume password is plaintext
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214 if self.password is None:
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215 raise ValueError, 'Password not set'
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216 return cmp(self.password, encodePassword(other, self.scheme,
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diff changeset
217 self.password or None))
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218
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219 class Password(JournalPassword):
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220 """The class encapsulates a Password property type value in the database.
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diff changeset
221
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diff changeset
222 The encoding of the password is one if None, 'SHA', 'MD5' or 'plaintext'.
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diff changeset
223 The encodePassword function is used to actually encode the password from
270
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diff changeset
224 plaintext. The None encoding is used in legacy databases where no
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diff changeset
225 encoding scheme is identified.
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226
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diff changeset
227 The scheme is stored with the encoded data in the database:
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diff changeset
228 {scheme}data
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229
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diff changeset
230 Example usage:
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diff changeset
231 >>> p = Password('sekrit')
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diff changeset
232 >>> p == 'sekrit'
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233 1
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diff changeset
234 >>> p != 'not sekrit'
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235 1
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diff changeset
236 >>> 'sekrit' == p
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diff changeset
237 1
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diff changeset
238 >>> 'not sekrit' != p
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diff changeset
239 1
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diff changeset
240 """
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diff changeset
241 #TODO: code to migrate from old password schemes.
270
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diff changeset
242
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diff changeset
243 deprecated_schemes = ["SHA", "MD5", "crypt", "plaintext"]
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diff changeset
244 known_schemes = ["PBKDF2"] + deprecated_schemes
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245
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246 def __init__(self, plaintext=None, scheme=None, encrypted=None, strict=False, config=None):
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247 """Call setPassword if plaintext is not None."""
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248 if scheme is None:
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249 scheme = self.default_scheme
270
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250 if plaintext is not None:
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251 self.setPassword (plaintext, scheme, config=config)
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diff changeset
252 elif encrypted is not None:
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253 self.unpack(encrypted, scheme, strict=strict, config=config)
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diff changeset
254 else:
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diff changeset
255 self.scheme = self.default_scheme
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256 self.password = None
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257 self.plaintext = None
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258
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diff changeset
259 def needs_migration(self):
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260 """ Password has insecure scheme or other insecure parameters
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diff changeset
261 and needs migration to new password scheme
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diff changeset
262 """
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263 if self.scheme in self.deprecated_schemes:
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264 return True
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265 rounds, salt, raw_salt, digest = pbkdf2_unpack(self.password)
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266 if rounds < 1000:
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267 return True
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268 return False
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269
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270 def unpack(self, encrypted, scheme=None, strict=False, config=None):
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271 """Set the password info from the scheme:<encryted info> string
270
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272 (the inverse of __str__)
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273 """
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274 m = self.pwre.match(encrypted)
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275 if m:
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276 self.scheme = m.group(1)
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277 self.password = m.group(2)
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278 self.plaintext = None
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279 else:
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280 # currently plaintext - encrypt
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281 self.setPassword(encrypted, scheme, config=config)
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282 if strict and self.scheme not in self.known_schemes:
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283 raise PasswordValueError, "Unknown encryption scheme: %r" % (self.scheme,)
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284
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285 def setPassword(self, plaintext, scheme=None, config=None):
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286 """Sets encrypts plaintext."""
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287 if scheme is None:
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288 scheme = self.default_scheme
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289 self.scheme = scheme
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290 self.password = encodePassword(plaintext, scheme, config=config)
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291 self.plaintext = plaintext
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292
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293 def __str__(self):
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294 """Stringify the encrypted password for database storage."""
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295 if self.password is None:
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296 raise ValueError, 'Password not set'
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297 return '{%s}%s'%(self.scheme, self.password)
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298
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299 def test():
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300 # SHA
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301 p = Password('sekrit')
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302 assert p == 'sekrit'
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303 assert p != 'not sekrit'
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304 assert 'sekrit' == p
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305 assert 'not sekrit' != p
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306
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307 # MD5
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308 p = Password('sekrit', 'MD5')
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309 assert p == 'sekrit'
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310 assert p != 'not sekrit'
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311 assert 'sekrit' == p
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312 assert 'not sekrit' != p
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313
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314 # crypt
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315 if crypt: # not available on Windows
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316 p = Password('sekrit', 'crypt')
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317 assert p == 'sekrit'
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318 assert p != 'not sekrit'
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319 assert 'sekrit' == p
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320 assert 'not sekrit' != p
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321
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322 # PBKDF2 - low level function
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323 from binascii import unhexlify
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324 k = pbkdf2("password", "ATHENA.MIT.EDUraeburn", 1200, 32)
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325 assert k == unhexlify("5c08eb61fdf71e4e4ec3cf6ba1f5512ba7e52ddbc5e5142f708a31e2e62b1e13")
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326
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327 # PBKDF2 - hash function
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328 h = "5000$7BvbBq.EZzz/O0HuwX3iP.nAG3s$g3oPnFFaga2BJaX5PoPRljl4XIE"
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329 assert encodePassword("sekrit", "PBKDF2", h) == h
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330
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331 # PBKDF2 - high level integration
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332 p = Password('sekrit', 'PBKDF2')
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333 assert p == 'sekrit'
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334 assert p != 'not sekrit'
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335 assert 'sekrit' == p
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336 assert 'not sekrit' != p
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337
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338 if __name__ == '__main__':
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339 test()
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340
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341 # vim: set filetype=python sts=4 sw=4 et si :
Roundup Issue Tracker: http://roundup-tracker.org/