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annotate sat/plugins/plugin_xep_0300.py @ 3696:52ee22d78e18

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plugin XEP-0384: fix encryption for user own devices: our own jid is added automatically by OMEMO library, but during the generation of the stanza, our list of jids was used to get the keys (and thus our own jid and devices keys was missing). fix 402
author Goffi <goffi@goffi.org>
date Fri, 22 Oct 2021 18:46:51 +0200
parents be6d91572633
children 40d47cc29ea4
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1 #!/usr/bin/env python3
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2
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3
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4 # SAT plugin for Hash functions (XEP-0300)
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5 # Copyright (C) 2009-2021 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
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24 log = getLogger(__name__)
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25 from sat.core import exceptions
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26 from twisted.words.xish import domish
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27 from twisted.words.protocols.jabber.xmlstream import XMPPHandler
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28 from twisted.internet import threads
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29 from twisted.internet import defer
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30 from zope.interface import implementer
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31 from wokkel import disco, iwokkel
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32 from collections import OrderedDict
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33 import hashlib
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34 import base64
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36
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37 PLUGIN_INFO = {
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38 C.PI_NAME: "Cryptographic Hash Functions",
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39 C.PI_IMPORT_NAME: "XEP-0300",
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40 C.PI_TYPE: "XEP",
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41 C.PI_MODES: C.PLUG_MODE_BOTH,
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42 C.PI_PROTOCOLS: ["XEP-0300"],
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43 C.PI_MAIN: "XEP_0300",
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44 C.PI_HANDLER: "yes",
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45 C.PI_DESCRIPTION: _("""Management of cryptographic hashes"""),
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46 }
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47
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48 NS_HASHES = "urn:xmpp:hashes:2"
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49 NS_HASHES_FUNCTIONS = "urn:xmpp:hash-function-text-names:{}"
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50 BUFFER_SIZE = 2 ** 12
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51 ALGO_DEFAULT = "sha-256"
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52
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53
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54 class XEP_0300(object):
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55 # TODO: add blake after moving to Python 3
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56 ALGOS = OrderedDict(
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57 (
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58 ("md5", hashlib.md5),
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59 ("sha-1", hashlib.sha1),
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60 ("sha-256", hashlib.sha256),
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61 ("sha-512", hashlib.sha512),
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62 )
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63 )
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64
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65 def __init__(self, host):
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66 log.info(_("plugin Hashes initialization"))
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67 host.registerNamespace("hashes", NS_HASHES)
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68
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69 def getHandler(self, client):
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70 return XEP_0300_handler()
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71
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72 def getHasher(self, algo=ALGO_DEFAULT):
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73 """Return hasher instance
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74
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75 @param algo(unicode): one of the XEP_300.ALGOS keys
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76 @return (hash object): same object s in hashlib.
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77 update method need to be called for each chunh
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78 diget or hexdigest can be used at the end
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79 """
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80 return self.ALGOS[algo]()
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81
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82 def getDefaultAlgo(self):
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83 return ALGO_DEFAULT
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84
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85 @defer.inlineCallbacks
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86 def getBestPeerAlgo(self, to_jid, profile):
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87 """Return the best available hashing algorith of other peer
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88
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89 @param to_jid(jid.JID): peer jid
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90 @parm profile: %(doc_profile)s
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91 @return (D(unicode, None)): best available algorithm,
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92 or None if hashing is not possible
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93 """
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94 client = self.host.getClient(profile)
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95 for algo in reversed(XEP_0300.ALGOS):
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96 has_feature = yield self.host.hasFeature(
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97 client, NS_HASHES_FUNCTIONS.format(algo), to_jid
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98 )
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99 if has_feature:
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100 log.debug(
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101 "Best hashing algorithm found for {jid}: {algo}".format(
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102 jid=to_jid.full(), algo=algo
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103 )
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104 )
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105 defer.returnValue(algo)
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106
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107 def _calculateHashBlocking(self, file_obj, hasher):
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108 """Calculate hash in a blocking way
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109
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110 /!\\ blocking method, please use calculateHash instead
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111 @param file_obj(file): a file-like object
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112 @param hasher(hash object): the method to call to initialise hash object
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113 @return (str): the hex digest of the hash
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114 """
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115 while True:
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116 buf = file_obj.read(BUFFER_SIZE)
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117 if not buf:
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118 break
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119 hasher.update(buf)
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120 return hasher.hexdigest()
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121
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122 def calculateHash(self, file_obj, hasher):
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123 return threads.deferToThread(self._calculateHashBlocking, file_obj, hasher)
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124
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125 def calculateHashElt(self, file_obj=None, algo=ALGO_DEFAULT):
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126 """Compute hash and build hash element
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127
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128 @param file_obj(file, None): file-like object to use to calculate the hash
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129 @param algo(unicode): algorithme to use, must be a key of XEP_0300.ALGOS
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130 @return (D(domish.Element)): hash element
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131 """
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132
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133 def hashCalculated(hash_):
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134 return self.buildHashElt(hash_, algo)
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135
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136 hasher = self.getHasher(algo)
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137 hash_d = self.calculateHash(file_obj, hasher)
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138 hash_d.addCallback(hashCalculated)
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139 return hash_d
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140
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141 def buildHashUsedElt(self, algo=ALGO_DEFAULT):
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142 hash_used_elt = domish.Element((NS_HASHES, "hash-used"))
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143 hash_used_elt["algo"] = algo
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144 return hash_used_elt
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145
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146 def parseHashUsedElt(self, parent):
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147 """Find and parse a hash-used element
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148
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149 @param (domish.Element): parent of <hash/> element
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150 @return (unicode): hash algorithm used
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151 @raise exceptions.NotFound: the element is not present
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152 @raise exceptions.DataError: the element is invalid
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153 """
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154 try:
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155 hash_used_elt = next(parent.elements(NS_HASHES, "hash-used"))
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156 except StopIteration:
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157 raise exceptions.NotFound
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158 algo = hash_used_elt["algo"]
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159 if not algo:
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160 raise exceptions.DataError
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161 return algo
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162
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163 def buildHashElt(self, hash_, algo=ALGO_DEFAULT):
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164 """Compute hash and build hash element
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165
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166 @param hash_(str): hash to use
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167 @param algo(unicode): algorithme to use, must be a key of XEP_0300.ALGOS
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168 @return (domish.Element): computed hash
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169 """
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170 assert hash_
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171 assert algo
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172 hash_elt = domish.Element((NS_HASHES, "hash"))
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173 if hash_ is not None:
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174 b64_hash = base64.b64encode(hash_.encode('utf-8')).decode('utf-8')
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175 hash_elt.addContent(b64_hash)
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176 hash_elt["algo"] = algo
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177 return hash_elt
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178
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179 def parseHashElt(self, parent):
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180 """Find and parse a hash element
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181
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182 if multiple elements are found, the strongest managed one is returned
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183 @param (domish.Element): parent of <hash/> element
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184 @return (tuple[str, bytes]): (algo, hash) tuple
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185 both values can be None if <hash/> is empty
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186 @raise exceptions.NotFound: the element is not present
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187 @raise exceptions.DataError: the element is invalid
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188 """
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189 algos = list(XEP_0300.ALGOS.keys())
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190 hash_elt = None
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191 best_algo = None
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192 best_value = None
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193 for hash_elt in parent.elements(NS_HASHES, "hash"):
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194 algo = hash_elt.getAttribute("algo")
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195 try:
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196 idx = algos.index(algo)
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197 except ValueError:
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198 log.warning(f"Proposed {algo} algorithm is not managed")
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199 algo = None
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200 continue
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201
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202 if best_algo is None or algos.index(best_algo) < idx:
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203 best_algo = algo
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204 best_value = base64.b64decode(str(hash_elt)).decode('utf-8')
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205
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206 if not hash_elt:
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207 raise exceptions.NotFound
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208 if not best_algo or not best_value:
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209 raise exceptions.DataError
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210 return best_algo, best_value
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211
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212
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213 @implementer(iwokkel.IDisco)
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214 class XEP_0300_handler(XMPPHandler):
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215
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216 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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217 hash_functions_names = [
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218 disco.DiscoFeature(NS_HASHES_FUNCTIONS.format(algo))
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219 for algo in XEP_0300.ALGOS
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220 ]
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221 return [disco.DiscoFeature(NS_HASHES)] + hash_functions_names
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222
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223 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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224 return []