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annotate src/plugins/plugin_xep_0300.py @ 1974:b34fdb44b7d4

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author Goffi <goffi@goffi.org>
date Mon, 27 Jun 2016 22:04:55 +0200
parents 2daf7b4c6756
children 1d3f73e065e1
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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) 2009-2016 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.log import getLogger
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22 log = getLogger(__name__)
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23 from sat.core import exceptions
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24 from twisted.words.xish import domish
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25 from twisted.words.protocols.jabber.xmlstream import XMPPHandler
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26 from twisted.internet import threads
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27 from twisted.internet import defer
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28 from zope.interface import implements
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29 from wokkel import disco, iwokkel
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30 from collections import OrderedDict
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31 import hashlib
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32
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33
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34 PLUGIN_INFO = {
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35 "name": "Cryptographic Hash Functions",
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36 "import_name": "XEP-0300",
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37 "type": "XEP",
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38 "protocols": ["XEP-0300"],
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39 "main": "XEP_0300",
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40 "handler": "yes",
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41 "description": _("""Management of cryptographic hashes""")
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42 }
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43
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44 NS_HASHES = "urn:xmpp:hashes:1"
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45 NS_HASHES_FUNCTIONS = u"urn:xmpp:hash-function-text-names:{}"
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46 BUFFER_SIZE = 2**12
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47 ALGO_DEFAULT = 'sha-256'
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48
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49
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50 class XEP_0300(object):
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51 ALGOS = OrderedDict((
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52 (u'md5', hashlib.md5),
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53 (u'sha-1', hashlib.sha1),
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54 (u'sha-256', hashlib.sha256),
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55 (u'sha-512', hashlib.sha512),
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56 ))
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57
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58 def __init__(self, host):
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59 log.info(_("plugin Hashes initialization"))
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60
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61 def getHandler(self, profile):
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62 return XEP_0300_handler()
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63
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64 def getHasher(self, algo):
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65 """Return hasher instance
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66
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67 /!\\ blocking method, considere using calculateHashElt
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68 if you want to hash a big file
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69 @param algo(unicode): one of the XEP_300.ALGOS keys
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70 @return (hash object): same object s in hashlib.
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71 update method need to be called for each chunh
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72 diget or hexdigest can be used at the end
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73 """
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74 return self.ALGOS[algo]()
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75
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76 @defer.inlineCallbacks
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77 def getBestPeerAlgo(self, to_jid, profile):
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78 """Return the best available hashing algorith of other peer
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79
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80 @param to_jid(jid.JID): peer jid
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81 @parm profile: %(doc_profile)s
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82 @return (D(unicode, None)): best available algorithm,
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83 or None if hashing is not possible
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84 """
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85 for algo in reversed(XEP_0300.ALGOS):
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86 has_feature = yield self.host.hasFeature(NS_HASHES_FUNCTIONS.format(algo), to_jid, profile)
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87 if has_feature:
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88 log.debug(u"Best hashing algorithm found for {jid}: {algo}".format(
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89 jid=to_jid.full(),
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90 algo=algo))
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91 defer.returnValue(algo)
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92
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93 def calculateHashBlocking(self, file_obj, hasher):
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94 """Calculate hash in a blocking way
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95
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96 @param file_obj(file): a file-like object
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97 @param hasher(callable): the method to call to initialise hash object
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98 @return (str): the hex digest of the hash
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99 """
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100 hash_ = hasher()
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101 while True:
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102 buf = file_obj.read(BUFFER_SIZE)
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103 if not buf:
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104 break
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105 hash_.update(buf)
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106 return hash_.hexdigest()
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107
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108 def calculateHashElt(self, file_obj=None, algo=ALGO_DEFAULT):
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109 """Compute hash and build hash element
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110
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111 @param file_obj(file, None): file-like object to use to calculate the hash
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112 @param algo(unicode): algorithme to use, must be a key of XEP_0300.ALGOS
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113 @return (D(domish.Element)): hash element
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114 """
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115 def hashCalculated(hash_):
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116 return self.buildHashElt(hash_, algo)
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117 hasher = self.ALGOS[algo]
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118 hash_d = threads.deferToThread(self.calculateHashBlocking, file_obj, hasher)
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119 hash_d.addCallback(hashCalculated)
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120 return hash_d
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121
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122 def buildHashElt(self, hash_=None, algo=ALGO_DEFAULT):
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123 """Compute hash and build hash element
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124
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125 @param hash_(None, str): hash to use, or None for an empty element
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126 @param algo(unicode): algorithme to use, must be a key of XEP_0300.ALGOS
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127 @return (domish.Element): computed hash
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128 """
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129 hash_elt = domish.Element((NS_HASHES, 'hash'))
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130 if hash_ is not None:
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131 hash_elt.addContent(hash_)
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132 hash_elt['algo']=algo
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133 return hash_elt
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134
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135 def parseHashElt(self, parent):
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136 """Find and parse a hash element
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Goffi <goffi@goffi.org>
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137
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138 if multiple elements are found, the strongest managed one is returned
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139 @param (domish.Element): parent of <hash/> element
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140 @return (tuple[unicode, str]): (algo, hash) tuple
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141 both values can be None if <hash/> is empty
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142 @raise exceptions.NotFound: the element is not present
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143 """
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Goffi <goffi@goffi.org>
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144 algos = XEP_0300.ALGOS.keys()
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Goffi <goffi@goffi.org>
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145 hash_elt = None
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Goffi <goffi@goffi.org>
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146 best_algo = None
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Goffi <goffi@goffi.org>
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147 best_value = None
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148 for hash_elt in parent.elements(NS_HASHES, 'hash'):
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149 algo = hash_elt.getAttribute('algo')
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150 try:
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151 idx = algos.index(algo)
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Goffi <goffi@goffi.org>
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152 except ValueError:
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153 log.warning(u"Proposed {} algorithm is not managed".format(algo))
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154 algo = None
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Goffi <goffi@goffi.org>
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155 continue
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156
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Goffi <goffi@goffi.org>
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157 if best_algo is None or algos.index(best_algo) < idx:
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Goffi <goffi@goffi.org>
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158 best_algo = algo
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Goffi <goffi@goffi.org>
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159 best_value = str(hash_elt) or None
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Goffi <goffi@goffi.org>
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160
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Goffi <goffi@goffi.org>
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161 if not hash_elt:
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162 raise exceptions.NotFound
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Goffi <goffi@goffi.org>
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163 return best_algo, best_value
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164
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165
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166 class XEP_0300_handler(XMPPHandler):
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167 implements(iwokkel.IDisco)
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168
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Goffi <goffi@goffi.org>
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169 def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
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Goffi <goffi@goffi.org>
parents: 1526
diff changeset
170 hash_functions_names = [disco.DiscoFeature(NS_HASHES_FUNCTIONS.format(algo)) for algo in XEP_0300.ALGOS]
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parents: 1526
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171 return [disco.DiscoFeature(NS_HASHES)] + hash_functions_names
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172
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Goffi <goffi@goffi.org>
parents: 1526
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173 def getDiscoItems(self, requestor, target, nodeIdentifier=''):
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174 return []