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annotate sat/plugins/plugin_xep_0300.py @ 3058:0408df45ebe7

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plugin OTR: work around a bad exception raised in potr
author Goffi <goffi@goffi.org>
date Wed, 16 Oct 2019 08:39:52 +0200
parents fee60f17ebac
children 9d0df638c8b4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #!/usr/bin/env python3
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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) 2009-2019 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(callable): 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 hash_ = hasher()
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116 while True:
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117 buf = file_obj.read(BUFFER_SIZE)
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118 if not buf:
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119 break
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120 hash_.update(buf)
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121 return hash_.hexdigest()
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122
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123 def calculateHash(self, file_obj, hasher):
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124 return threads.deferToThread(self._calculateHashBlocking, file_obj, hasher)
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125
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126 def calculateHashElt(self, file_obj=None, algo=ALGO_DEFAULT):
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127 """Compute hash and build hash element
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128
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129 @param file_obj(file, None): file-like object to use to calculate the hash
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130 @param algo(unicode): algorithme to use, must be a key of XEP_0300.ALGOS
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131 @return (D(domish.Element)): hash element
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132 """
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133
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134 def hashCalculated(hash_):
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135 return self.buildHashElt(hash_, algo)
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136
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137 hasher = self.ALGOS[algo]
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138 hash_d = self.calculateHash(file_obj, hasher)
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139 hash_d.addCallback(hashCalculated)
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140 return hash_d
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141
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142 def buildHashUsedElt(self, algo=ALGO_DEFAULT):
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143 hash_used_elt = domish.Element((NS_HASHES, "hash-used"))
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144 hash_used_elt["algo"] = algo
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145 return hash_used_elt
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146
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147 def parseHashUsedElt(self, parent):
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148 """Find and parse a hash-used element
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149
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150 @param (domish.Element): parent of <hash/> element
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151 @return (unicode): hash algorithm used
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152 @raise exceptions.NotFound: the element is not present
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153 @raise exceptions.DataError: the element is invalid
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154 """
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155 try:
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156 hash_used_elt = next(parent.elements(NS_HASHES, "hash-used"))
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157 except StopIteration:
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158 raise exceptions.NotFound
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159 algo = hash_used_elt["algo"]
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160 if not algo:
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161 raise exceptions.DataError
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162 return algo
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163
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164 def buildHashElt(self, hash_, algo=ALGO_DEFAULT):
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165 """Compute hash and build hash element
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166
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167 @param hash_(str): hash to use
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168 @param algo(unicode): algorithme to use, must be a key of XEP_0300.ALGOS
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169 @return (domish.Element): computed hash
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170 """
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171 assert hash_
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172 assert algo
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173 hash_elt = domish.Element((NS_HASHES, "hash"))
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174 if hash_ is not None:
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175 b64_hash = base64.b64encode(hash_.encode('utf-8')).decode('utf-8')
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176 hash_elt.addContent(b64_hash)
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177 hash_elt["algo"] = algo
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178 return hash_elt
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179
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180 def parseHashElt(self, parent):
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181 """Find and parse a hash element
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182
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183 if multiple elements are found, the strongest managed one is returned
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184 @param (domish.Element): parent of <hash/> element
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185 @return (tuple[str, bytes]): (algo, hash) tuple
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186 both values can be None if <hash/> is empty
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187 @raise exceptions.NotFound: the element is not present
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188 @raise exceptions.DataError: the element is invalid
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189 """
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190 algos = list(XEP_0300.ALGOS.keys())
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191 hash_elt = None
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192 best_algo = None
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193 best_value = None
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194 for hash_elt in parent.elements(NS_HASHES, "hash"):
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195 algo = hash_elt.getAttribute("algo")
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196 try:
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197 idx = algos.index(algo)
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198 except ValueError:
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199 log.warning(f"Proposed {algo} algorithm is not managed")
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200 algo = None
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201 continue
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202
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203 if best_algo is None or algos.index(best_algo) < idx:
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204 best_algo = algo
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205 best_value = base64.b64decode(str(hash_elt)).decode('utf-8')
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206
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207 if not hash_elt:
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208 raise exceptions.NotFound
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209 if not best_algo or not best_value:
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210 raise exceptions.DataError
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211 return best_algo, best_value
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212
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213
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214 @implementer(iwokkel.IDisco)
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215 class XEP_0300_handler(XMPPHandler):
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216
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217 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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218 hash_functions_names = [
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219 disco.DiscoFeature(NS_HASHES_FUNCTIONS.format(algo))
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220 for algo in XEP_0300.ALGOS
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221 ]
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222 return [disco.DiscoFeature(NS_HASHES)] + hash_functions_names
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223
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224 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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225 return []