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annotate roundup/password.py @ 5350:66a17c80e035

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Force all uses of random to use SystemRandom and abort if pseudorandom random.Random would be used rather than Random.SystemRandom. random.Random is returning the same value time after time. Even when being seeded after instantiation, calls to the random.random() function return the same value like it's not advanceing the state of the generator. So "fix" is to force use of system random generator to generate: one time keys for password reset (action.py) random passwords when resetting passwords (password.py) serial number for auto ssl cert generation (roundup_server.py) Message-ID's in email: mailgw.py, client.py anti-csrf nonces (templating.py)
author John Rouillard <rouilj@ieee.org>
date Sat, 07 Jul 2018 22:02:41 -0400
parents 9792b18e0b19
children 91954be46a66
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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
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23 import os
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24 from base64 import b64encode, b64decode
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25 from hashlib import md5, sha1
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26
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27 try:
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28 # Use the cryptographic source of randomness if available
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29 from random import SystemRandom
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30 random=SystemRandom()
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31 except ImportError:
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32 raise
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33 from random import Random
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34 random=Random()
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35
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36 try:
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37 import crypt
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38 except ImportError:
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39 crypt = None
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40
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41 _bempty = ""
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42 _bjoin = _bempty.join
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43
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44 def getrandbytes(count):
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45 return _bjoin(chr(random.randint(0,255)) for i in xrange(count))
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46
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47 #NOTE: PBKDF2 hash is using this variant of base64 to minimize encoding size,
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48 # and have charset that's compatible w/ unix crypt variants
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49 def h64encode(data):
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50 """encode using variant of base64"""
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51 return b64encode(data, "./").strip("=\n")
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52
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53 def h64decode(data):
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54 """decode using variant of base64"""
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55 off = len(data) % 4
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56 if off == 0:
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57 return b64decode(data, "./")
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58 elif off == 1:
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59 raise ValueError("Invalid base64 input")
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60 elif off == 2:
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61 return b64decode(data + "==", "./")
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62 else:
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63 return b64decode(data + "=", "./")
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64
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65 try:
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66 from M2Crypto.EVP import pbkdf2 as _pbkdf2
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67 except ImportError:
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68 #no m2crypto - make our own pbkdf2 function
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69 from struct import pack
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70 from hmac import HMAC
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71
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72 def xor_bytes(left, right):
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73 "perform bitwise-xor of two byte-strings"
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74 return _bjoin(chr(ord(l) ^ ord(r)) for l, r in zip(left, right))
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75
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76 def _pbkdf2(password, salt, rounds, keylen):
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77 digest_size = 20 # sha1 generates 20-byte blocks
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78 total_blocks = int((keylen+digest_size-1)/digest_size)
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79 hmac_template = HMAC(password, None, sha1)
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80 out = _bempty
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81 for i in xrange(1, total_blocks+1):
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82 hmac = hmac_template.copy()
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83 hmac.update(salt + pack(">L",i))
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84 block = tmp = hmac.digest()
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85 for j in xrange(rounds-1):
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86 hmac = hmac_template.copy()
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87 hmac.update(tmp)
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88 tmp = hmac.digest()
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89 #TODO: need to speed up this call
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90 block = xor_bytes(block, tmp)
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91 out += block
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92 return out[:keylen]
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93
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94 def ssha(password, salt):
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95 ''' Make ssha digest from password and salt.
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96 Based on code of Roberto Aguilar <roberto@baremetal.io>
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97 https://gist.github.com/rca/7217540
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98 '''
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99 shaval = sha1(password)
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100 shaval.update( salt )
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101 ssha_digest = b64encode( '{}{}'.format(shaval.digest(), salt) ).strip()
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102 return ssha_digest
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103
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104 def pbkdf2(password, salt, rounds, keylen):
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105 """pkcs#5 password-based key derivation v2.0
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106
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107 :arg password: passphrase to use to generate key (if unicode, converted to utf-8)
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108 :arg salt: salt string to use when generating key (if unicode, converted to utf-8)
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109 :param rounds: number of rounds to use to generate key
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110 :arg keylen: number of bytes to generate
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111
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112 If M2Crypto is present, uses it's implementation as backend.
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113
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114 :returns:
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115 raw bytes of generated key
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116 """
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117 if isinstance(password, unicode):
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118 password = password.encode("utf-8")
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119 if isinstance(salt, unicode):
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120 salt = salt.encode("utf-8")
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121 if keylen > 40:
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122 #NOTE: pbkdf2 allows up to (2**31-1)*20 bytes,
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123 # but m2crypto has issues on some platforms above 40,
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124 # and such sizes aren't needed for a password hash anyways...
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125 raise ValueError, "key length too large"
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126 if rounds < 1:
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127 raise ValueError, "rounds must be positive number"
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128 return _pbkdf2(password, salt, rounds, keylen)
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129
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130 class PasswordValueError(ValueError):
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131 """ The password value is not valid """
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diff changeset
132 pass
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133
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134 def pbkdf2_unpack(pbkdf2):
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135 """ unpack pbkdf2 encrypted password into parts,
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136 assume it has format "{rounds}${salt}${digest}
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137 """
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diff changeset
138 if isinstance(pbkdf2, unicode):
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diff changeset
139 pbkdf2 = pbkdf2.encode("ascii")
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diff changeset
140 try:
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diff changeset
141 rounds, salt, digest = pbkdf2.split("$")
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142 except ValueError:
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143 raise PasswordValueError, "invalid PBKDF2 hash (wrong number of separators)"
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144 if rounds.startswith("0"):
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diff changeset
145 raise PasswordValueError, "invalid PBKDF2 hash (zero-padded rounds)"
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diff changeset
146 try:
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147 rounds = int(rounds)
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diff changeset
148 except ValueError:
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diff changeset
149 raise PasswordValueError, "invalid PBKDF2 hash (invalid rounds)"
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150 raw_salt = h64decode(salt)
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151 return rounds, salt, raw_salt, digest
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152
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153 def encodePassword(plaintext, scheme, other=None, config=None):
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154 """Encrypt the plaintext password.
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155 """
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156 if plaintext is None:
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157 plaintext = ""
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158 if scheme == "PBKDF2":
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159 if other:
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160 rounds, salt, raw_salt, digest = pbkdf2_unpack(other)
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161 else:
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162 raw_salt = getrandbytes(20)
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163 salt = h64encode(raw_salt)
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164 if config:
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165 rounds = config.PASSWORD_PBKDF2_DEFAULT_ROUNDS
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166 else:
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167 rounds = 10000
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168 if rounds < 1000:
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169 raise PasswordValueError, "invalid PBKDF2 hash (rounds too low)"
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170 raw_digest = pbkdf2(plaintext, raw_salt, rounds, 20)
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171 return "%d$%s$%s" % (rounds, salt, h64encode(raw_digest))
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172 elif scheme == 'SSHA':
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173 if other:
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diff changeset
174 raw_other = b64decode(other)
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175 salt = raw_other[20:]
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176 else:
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177 #new password
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178 # variable salt length
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179 salt_len = random.randrange(36, 52)
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180 salt = os.urandom(salt_len)
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diff changeset
181 s = ssha(plaintext, salt)
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182 elif scheme == 'SHA':
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183 s = sha1(plaintext).hexdigest()
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diff changeset
184 elif scheme == 'MD5':
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185 s = md5(plaintext).hexdigest()
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diff changeset
186 elif scheme == 'crypt' and crypt is not None:
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187 if other is not None:
3434
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188 salt = other
1229
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189 else:
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190 saltchars = './0123456789'+string.letters
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191 salt = random.choice(saltchars) + random.choice(saltchars)
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192 s = crypt.crypt(plaintext, salt)
270
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193 elif scheme == 'plaintext':
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194 s = plaintext
270
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195 else:
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diff changeset
196 raise PasswordValueError, 'Unknown encryption scheme %r'%scheme
270
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197 return s
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198
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efdce3d32698 Increase generated password length to 12 symbols.
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diff changeset
199 def generatePassword(length=12):
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caae7d8934dc set new email rego user password to random string
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200 chars = string.letters+string.digits
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diff changeset
201 password = [random.choice(chars) for x in range(length)]
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diff changeset
202 # make sure there is at least one digit
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diff changeset
203 password[0] = random.choice(string.digits)
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diff changeset
204 random.shuffle(password)
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diff changeset
205 return ''.join(password)
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diff changeset
206
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diff changeset
207 class JournalPassword:
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diff changeset
208 """ Password dummy instance intended for journal operation.
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diff changeset
209 We do not store passwords in the journal any longer. The dummy
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diff changeset
210 version only reads the encryption scheme from the given
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diff changeset
211 encrypted password.
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diff changeset
212 """
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diff changeset
213 default_scheme = 'PBKDF2' # new encryptions use this scheme
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diff changeset
214 pwre = re.compile(r'{(\w+)}(.+)')
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diff changeset
215
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diff changeset
216 def __init__ (self, encrypted=''):
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diff changeset
217 if isinstance(encrypted, self.__class__):
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diff changeset
218 self.scheme = encrypted.scheme or self.default_scheme
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diff changeset
219 else:
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diff changeset
220 m = self.pwre.match(encrypted)
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diff changeset
221 if m:
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diff changeset
222 self.scheme = m.group(1)
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diff changeset
223 else:
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diff changeset
224 self.scheme = self.default_scheme
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diff changeset
225 self.password = ''
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diff changeset
226
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diff changeset
227 def dummystr(self):
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diff changeset
228 """ return dummy string to store in journal
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diff changeset
229 - reports scheme, but nothing else
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diff changeset
230 """
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diff changeset
231 return "{%s}*encrypted*" % (self.scheme,)
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diff changeset
232
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diff changeset
233 __str__ = dummystr
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diff changeset
234
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diff changeset
235 def __cmp__(self, other):
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diff changeset
236 """Compare this password against another password."""
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diff changeset
237 # check to see if we're comparing instances
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diff changeset
238 if isinstance(other, self.__class__):
22bc0426e348 Second patch from issue2550688 -- with some changes:
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parents: 4480
diff changeset
239 if self.scheme != other.scheme:
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parents: 4480
diff changeset
240 return cmp(self.scheme, other.scheme)
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parents: 4480
diff changeset
241 return cmp(self.password, other.password)
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diff changeset
242
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diff changeset
243 # assume password is plaintext
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parents: 4480
diff changeset
244 if self.password is None:
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Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
245 raise ValueError, 'Password not set'
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parents: 4480
diff changeset
246 return cmp(self.password, encodePassword(other, self.scheme,
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Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
247 self.password or None))
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diff changeset
248
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diff changeset
249 class Password(JournalPassword):
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diff changeset
250 """The class encapsulates a Password property type value in the database.
270
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parents:
diff changeset
251
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diff changeset
252 The encoding of the password is one if None, 'SHA', 'MD5' or 'plaintext'.
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diff changeset
253 The encodePassword function is used to actually encode the password from
270
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parents:
diff changeset
254 plaintext. The None encoding is used in legacy databases where no
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parents:
diff changeset
255 encoding scheme is identified.
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parents:
diff changeset
256
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parents:
diff changeset
257 The scheme is stored with the encoded data in the database:
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parents:
diff changeset
258 {scheme}data
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parents:
diff changeset
259
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parents:
diff changeset
260 Example usage:
a4241ddd22d7 Added the Password property type.
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parents:
diff changeset
261 >>> p = Password('sekrit')
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262 >>> p == 'sekrit'
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263 1
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264 >>> p != 'not sekrit'
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265 1
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266 >>> 'sekrit' == p
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267 1
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268 >>> 'not sekrit' != p
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269 1
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270 """
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271 #TODO: code to migrate from old password schemes.
270
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272
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273 deprecated_schemes = ["SHA", "MD5", "crypt", "plaintext"]
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274 known_schemes = ["PBKDF2", "SSHA"] + deprecated_schemes
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275
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276 def __init__(self, plaintext=None, scheme=None, encrypted=None, strict=False, config=None):
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277 """Call setPassword if plaintext is not None."""
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278 if scheme is None:
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279 scheme = self.default_scheme
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280 if plaintext is not None:
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281 self.setPassword (plaintext, scheme, config=config)
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282 elif encrypted is not None:
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283 self.unpack(encrypted, scheme, strict=strict, config=config)
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284 else:
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285 self.scheme = self.default_scheme
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286 self.password = None
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287 self.plaintext = None
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288
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289 def needs_migration(self):
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290 """ Password has insecure scheme or other insecure parameters
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291 and needs migration to new password scheme
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292 """
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293 if self.scheme in self.deprecated_schemes:
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294 return True
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295 rounds, salt, raw_salt, digest = pbkdf2_unpack(self.password)
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296 if rounds < 1000:
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297 return True
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298 return False
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299
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300 def unpack(self, encrypted, scheme=None, strict=False, config=None):
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301 """Set the password info from the scheme:<encryted info> string
270
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302 (the inverse of __str__)
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303 """
270
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304 m = self.pwre.match(encrypted)
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305 if m:
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306 self.scheme = m.group(1)
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307 self.password = m.group(2)
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308 self.plaintext = None
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309 else:
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310 # currently plaintext - encrypt
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311 self.setPassword(encrypted, scheme, config=config)
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312 if strict and self.scheme not in self.known_schemes:
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313 raise PasswordValueError, "Unknown encryption scheme: %r" % (self.scheme,)
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314
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315 def setPassword(self, plaintext, scheme=None, config=None):
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316 """Sets encrypts plaintext."""
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317 if scheme is None:
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318 scheme = self.default_scheme
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319 self.scheme = scheme
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320 self.password = encodePassword(plaintext, scheme, config=config)
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321 self.plaintext = plaintext
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322
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323 def __str__(self):
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324 """Stringify the encrypted password for database storage."""
270
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325 if self.password is None:
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326 raise ValueError, 'Password not set'
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327 return '{%s}%s'%(self.scheme, self.password)
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328
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329 def test():
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330 # SHA
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331 p = Password('sekrit')
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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 # MD5
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338 p = Password('sekrit', 'MD5')
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339 assert p == 'sekrit'
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340 assert p != 'not sekrit'
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341 assert 'sekrit' == p
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342 assert 'not sekrit' != p
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343
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344 # crypt
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345 if crypt: # not available on Windows
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346 p = Password('sekrit', 'crypt')
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347 assert p == 'sekrit'
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348 assert p != 'not sekrit'
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349 assert 'sekrit' == p
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350 assert 'not sekrit' != p
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351
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352 # SSHA
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353 p = Password('sekrit', 'SSHA')
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diff changeset
354 assert p == 'sekrit'
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355 assert p != 'not sekrit'
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356 assert 'sekrit' == p
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357 assert 'not sekrit' != p
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diff changeset
358
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diff changeset
359 # PBKDF2 - low level function
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diff changeset
360 from binascii import unhexlify
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diff changeset
361 k = pbkdf2("password", "ATHENA.MIT.EDUraeburn", 1200, 32)
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diff changeset
362 assert k == unhexlify("5c08eb61fdf71e4e4ec3cf6ba1f5512ba7e52ddbc5e5142f708a31e2e62b1e13")
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diff changeset
363
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diff changeset
364 # PBKDF2 - hash function
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365 h = "5000$7BvbBq.EZzz/O0HuwX3iP.nAG3s$g3oPnFFaga2BJaX5PoPRljl4XIE"
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diff changeset
366 assert encodePassword("sekrit", "PBKDF2", h) == h
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diff changeset
367
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diff changeset
368 # PBKDF2 - high level integration
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diff changeset
369 p = Password('sekrit', 'PBKDF2')
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diff changeset
370 assert p == 'sekrit'
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diff changeset
371 assert p != 'not sekrit'
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diff changeset
372 assert 'sekrit' == p
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diff changeset
373 assert 'not sekrit' != p
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diff changeset
374
5350
66a17c80e035 Force all uses of random to use SystemRandom and abort if
John Rouillard <rouilj@ieee.org>
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diff changeset
375
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John Rouillard <rouilj@ieee.org>
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diff changeset
376 print random.randrange(36, 52)
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377 # this seems to return the save password every time
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diff changeset
378 # when run inside a roundup daemon.
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diff changeset
379 # but it tests out ok. I don't know why. -- rouilj
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diff changeset
380 print generatePassword()
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diff changeset
381
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382 if __name__ == '__main__':
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383 test()
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384
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diff changeset
385 # vim: set filetype=python sts=4 sw=4 et si :
Roundup Issue Tracker: http://roundup-tracker.org/