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annotate sat/plugins/plugin_xep_0300.py @ 2622:8fb99ed47db4

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author Goffi <goffi@goffi.org>
date Wed, 27 Jun 2018 07:50:35 +0200
parents 26edcf3a30eb
children 56f94936df1e
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rev   line source
1934
2daf7b4c6756 use of /usr/bin/env instead of /usr/bin/python in shebang
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1 #!/usr/bin/env python2
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2 # -*- coding: utf-8 -*-
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3
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4 # SAT plugin for Hash functions (XEP-0300)
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5 # Copyright (C) 2009-2018 Jérôme Poisson (goffi@goffi.org)
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6
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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11
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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16
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 from sat.core.i18n import _
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21 from sat.core.constants import Const as C
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22 from sat.core.log import getLogger
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23 log = getLogger(__name__)
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24 from sat.core import exceptions
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25 from twisted.words.xish import domish
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26 from twisted.words.protocols.jabber.xmlstream import XMPPHandler
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27 from twisted.internet import threads
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28 from twisted.internet import defer
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29 from zope.interface import implements
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30 from wokkel import disco, iwokkel
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31 from collections import OrderedDict
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32 import hashlib
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33 import base64
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34
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35
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36 PLUGIN_INFO = {
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37 C.PI_NAME: "Cryptographic Hash Functions",
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38 C.PI_IMPORT_NAME: "XEP-0300",
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39 C.PI_TYPE: "XEP",
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40 C.PI_MODES: C.PLUG_MODE_BOTH,
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41 C.PI_PROTOCOLS: ["XEP-0300"],
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42 C.PI_MAIN: "XEP_0300",
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43 C.PI_HANDLER: "yes",
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44 C.PI_DESCRIPTION: _("""Management of cryptographic hashes""")
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45 }
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46
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47 NS_HASHES = "urn:xmpp:hashes:2"
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48 NS_HASHES_FUNCTIONS = u"urn:xmpp:hash-function-text-names:{}"
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49 BUFFER_SIZE = 2**12
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50 ALGO_DEFAULT = 'sha-256'
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51
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52
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53 class XEP_0300(object):
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54 # TODO: add blake after moving to Python 3
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55 ALGOS = OrderedDict((
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56 (u'md5', hashlib.md5),
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57 (u'sha-1', hashlib.sha1),
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58 (u'sha-256', hashlib.sha256),
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59 (u'sha-512', hashlib.sha512),
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60 ))
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61
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62 def __init__(self, host):
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63 log.info(_("plugin Hashes initialization"))
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64 host.registerNamespace('hashes', NS_HASHES)
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65
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66 def getHandler(self, client):
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67 return XEP_0300_handler()
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68
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69 def getHasher(self, algo=ALGO_DEFAULT):
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70 """Return hasher instance
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71
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72 @param algo(unicode): one of the XEP_300.ALGOS keys
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73 @return (hash object): same object s in hashlib.
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74 update method need to be called for each chunh
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75 diget or hexdigest can be used at the end
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76 """
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77 return self.ALGOS[algo]()
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78
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79 def getDefaultAlgo(self):
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80 return ALGO_DEFAULT
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81
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82 @defer.inlineCallbacks
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83 def getBestPeerAlgo(self, to_jid, profile):
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84 """Return the best available hashing algorith of other peer
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85
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86 @param to_jid(jid.JID): peer jid
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87 @parm profile: %(doc_profile)s
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88 @return (D(unicode, None)): best available algorithm,
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89 or None if hashing is not possible
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90 """
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91 client = self.host.getClient(profile)
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92 for algo in reversed(XEP_0300.ALGOS):
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93 has_feature = yield self.host.hasFeature(client, NS_HASHES_FUNCTIONS.format(algo), to_jid)
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94 if has_feature:
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95 log.debug(u"Best hashing algorithm found for {jid}: {algo}".format(
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96 jid=to_jid.full(),
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97 algo=algo))
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98 defer.returnValue(algo)
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99
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100 def _calculateHashBlocking(self, file_obj, hasher):
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101 """Calculate hash in a blocking way
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102
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103 /!\\ blocking method, please use calculateHash instead
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104 @param file_obj(file): a file-like object
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105 @param hasher(callable): the method to call to initialise hash object
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106 @return (str): the hex digest of the hash
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107 """
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108 hash_ = hasher()
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109 while True:
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110 buf = file_obj.read(BUFFER_SIZE)
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111 if not buf:
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112 break
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113 hash_.update(buf)
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114 return hash_.hexdigest()
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115
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116 def calculateHash(self, file_obj, hasher):
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117 return threads.deferToThread(self._calculateHashBlocking, file_obj, hasher)
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118
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119 def calculateHashElt(self, file_obj=None, algo=ALGO_DEFAULT):
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120 """Compute hash and build hash element
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121
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122 @param file_obj(file, None): file-like object to use to calculate the hash
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123 @param algo(unicode): algorithme to use, must be a key of XEP_0300.ALGOS
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124 @return (D(domish.Element)): hash element
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125 """
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126 def hashCalculated(hash_):
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127 return self.buildHashElt(hash_, algo)
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128 hasher = self.ALGOS[algo]
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129 hash_d = self.calculateHash(file_obj, hasher)
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130 hash_d.addCallback(hashCalculated)
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131 return hash_d
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132
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133 def buildHashUsedElt(self, algo=ALGO_DEFAULT):
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134 hash_used_elt = domish.Element((NS_HASHES, 'hash-used'))
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135 hash_used_elt['algo'] = algo
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136 return hash_used_elt
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137
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138 def parseHashUsedElt(self, parent):
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139 """Find and parse a hash-used element
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140
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141 @param (domish.Element): parent of <hash/> element
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142 @return (unicode): hash algorithm used
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143 @raise exceptions.NotFound: the element is not present
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144 @raise exceptions.DataError: the element is invalid
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145 """
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146 try:
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147 hash_used_elt = next(parent.elements(NS_HASHES, 'hash-used'))
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148 except StopIteration:
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149 raise exceptions.NotFound
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150 algo = hash_used_elt[u'algo']
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151 if not algo:
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152 raise exceptions.DataError
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153 return algo
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154
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155 def buildHashElt(self, hash_, algo=ALGO_DEFAULT):
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156 """Compute hash and build hash element
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157
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158 @param hash_(str): hash to use
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159 @param algo(unicode): algorithme to use, must be a key of XEP_0300.ALGOS
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160 @return (domish.Element): computed hash
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161 """
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162 assert hash_
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163 assert algo
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164 hash_elt = domish.Element((NS_HASHES, 'hash'))
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165 if hash_ is not None:
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166 hash_elt.addContent(base64.b64encode(hash_))
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167 hash_elt['algo'] = algo
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168 return hash_elt
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169
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170 def parseHashElt(self, parent):
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171 """Find and parse a hash element
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172
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173 if multiple elements are found, the strongest managed one is returned
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174 @param (domish.Element): parent of <hash/> element
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175 @return (tuple[unicode, str]): (algo, hash) tuple
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176 both values can be None if <hash/> is empty
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177 @raise exceptions.NotFound: the element is not present
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178 @raise exceptions.DataError: the element is invalid
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179 """
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180 algos = XEP_0300.ALGOS.keys()
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181 hash_elt = None
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182 best_algo = None
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183 best_value = None
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184 for hash_elt in parent.elements(NS_HASHES, 'hash'):
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185 algo = hash_elt.getAttribute('algo')
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186 try:
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187 idx = algos.index(algo)
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188 except ValueError:
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189 log.warning(u"Proposed {} algorithm is not managed".format(algo))
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190 algo = None
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191 continue
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192
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193 if best_algo is None or algos.index(best_algo) < idx:
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194 best_algo = algo
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195 best_value = base64.b64decode(unicode(hash_elt))
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196
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197 if not hash_elt:
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198 raise exceptions.NotFound
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199 if not best_algo or not best_value:
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200 raise exceptions.DataError
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201 return best_algo, best_value
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202
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203
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204 class XEP_0300_handler(XMPPHandler):
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205 implements(iwokkel.IDisco)
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206
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diff changeset
207 def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
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diff changeset
208 hash_functions_names = [disco.DiscoFeature(NS_HASHES_FUNCTIONS.format(algo)) for algo in XEP_0300.ALGOS]
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209 return [disco.DiscoFeature(NS_HASHES)] + hash_functions_names
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210
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211 def getDiscoItems(self, requestor, target, nodeIdentifier=''):
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212 return []