Mercurial > libervia-backend

annotate libervia/backend/plugins/plugin_xep_0300.py @ 4094:c3b68fdc2de7

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component AP gateway: fix handling of XMPP comments authors: the gateway was supposing that comments where emitted from PEP of author. While this is the case for most blog posts, it's not for comments. Instead the component is now using `author_jid` which is retrieved by XEP-0277 plugin, and reject the item if the auhor is not verified (i.e. if `publisher` attribute is not set by XMPP service).
author Goffi <goffi@goffi.org>
date Mon, 12 Jun 2023 14:50:43 +0200
parents 4b842c1fb686
children 0d7bb4df2343
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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 typing import Tuple
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21 import base64
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22 from collections import OrderedDict
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23 import hashlib
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24
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25 from twisted.internet import threads
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26 from twisted.internet import defer
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27 from twisted.words.protocols.jabber.xmlstream import XMPPHandler
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28 from twisted.words.xish import domish
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29 from wokkel import disco, iwokkel
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30 from zope.interface import implementer
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31
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32 from libervia.backend.core import exceptions
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33 from libervia.backend.core.constants import Const as C
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34 from libervia.backend.core.i18n import _
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35 from libervia.backend.core.log import getLogger
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36
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37 log = getLogger(__name__)
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39
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40 PLUGIN_INFO = {
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41 C.PI_NAME: "Cryptographic Hash Functions",
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42 C.PI_IMPORT_NAME: "XEP-0300",
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43 C.PI_TYPE: "XEP",
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44 C.PI_MODES: C.PLUG_MODE_BOTH,
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45 C.PI_PROTOCOLS: ["XEP-0300"],
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46 C.PI_MAIN: "XEP_0300",
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47 C.PI_HANDLER: "yes",
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48 C.PI_DESCRIPTION: _("""Management of cryptographic hashes"""),
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49 }
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50
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51 NS_HASHES = "urn:xmpp:hashes:2"
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52 NS_HASHES_FUNCTIONS = "urn:xmpp:hash-function-text-names:{}"
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53 BUFFER_SIZE = 2 ** 12
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54 ALGO_DEFAULT = "sha-256"
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55
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56
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57 class XEP_0300(object):
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58 # TODO: add blake after moving to Python 3
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59 ALGOS = OrderedDict(
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60 (
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61 ("md5", hashlib.md5),
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62 ("sha-1", hashlib.sha1),
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63 ("sha-256", hashlib.sha256),
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64 ("sha-512", hashlib.sha512),
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65 )
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66 )
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67 ALGO_DEFAULT = ALGO_DEFAULT
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68
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69 def __init__(self, host):
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70 log.info(_("plugin Hashes initialization"))
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71 host.register_namespace("hashes", NS_HASHES)
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72
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73 def get_handler(self, client):
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74 return XEP_0300_handler()
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75
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76 def get_hasher(self, algo=ALGO_DEFAULT):
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77 """Return hasher instance
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78
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79 @param algo(unicode): one of the XEP_300.ALGOS keys
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80 @return (hash object): same object s in hashlib.
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81 update method need to be called for each chunh
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82 diget or hexdigest can be used at the end
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83 """
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84 return self.ALGOS[algo]()
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85
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86 def get_default_algo(self):
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87 return ALGO_DEFAULT
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88
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89 @defer.inlineCallbacks
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90 def get_best_peer_algo(self, to_jid, profile):
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91 """Return the best available hashing algorith of other peer
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92
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93 @param to_jid(jid.JID): peer jid
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94 @parm profile: %(doc_profile)s
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95 @return (D(unicode, None)): best available algorithm,
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96 or None if hashing is not possible
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97 """
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98 client = self.host.get_client(profile)
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99 for algo in reversed(XEP_0300.ALGOS):
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100 has_feature = yield self.host.hasFeature(
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101 client, NS_HASHES_FUNCTIONS.format(algo), to_jid
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102 )
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103 if has_feature:
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104 log.debug(
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105 "Best hashing algorithm found for {jid}: {algo}".format(
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106 jid=to_jid.full(), algo=algo
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107 )
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108 )
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109 defer.returnValue(algo)
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110
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111 def _calculate_hash_blocking(self, file_obj, hasher):
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112 """Calculate hash in a blocking way
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113
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114 /!\\ blocking method, please use calculate_hash instead
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115 @param file_obj(file): a file-like object
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116 @param hasher(hash object): the method to call to initialise hash object
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117 @return (str): the hex digest of the hash
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118 """
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119 while True:
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120 buf = file_obj.read(BUFFER_SIZE)
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121 if not buf:
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122 break
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123 hasher.update(buf)
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124 return hasher.hexdigest()
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125
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126 def calculate_hash(self, file_obj, hasher):
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127 return threads.deferToThread(self._calculate_hash_blocking, file_obj, hasher)
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128
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129 def calculate_hash_elt(self, file_obj=None, algo=ALGO_DEFAULT):
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130 """Compute hash and build hash element
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131
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132 @param file_obj(file, None): file-like object to use to calculate the hash
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133 @param algo(unicode): algorithme to use, must be a key of XEP_0300.ALGOS
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134 @return (D(domish.Element)): hash element
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135 """
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136
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137 def hash_calculated(hash_):
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138 return self.build_hash_elt(hash_, algo)
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139
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140 hasher = self.get_hasher(algo)
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141 hash_d = self.calculate_hash(file_obj, hasher)
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142 hash_d.addCallback(hash_calculated)
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143 return hash_d
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144
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145 def build_hash_used_elt(self, algo=ALGO_DEFAULT):
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146 hash_used_elt = domish.Element((NS_HASHES, "hash-used"))
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147 hash_used_elt["algo"] = algo
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148 return hash_used_elt
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149
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150 def parse_hash_used_elt(self, parent):
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151 """Find and parse a hash-used element
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152
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153 @param (domish.Element): parent of <hash/> element
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154 @return (unicode): hash algorithm used
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155 @raise exceptions.NotFound: the element is not present
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156 @raise exceptions.DataError: the element is invalid
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157 """
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158 try:
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159 hash_used_elt = next(parent.elements(NS_HASHES, "hash-used"))
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160 except StopIteration:
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161 raise exceptions.NotFound
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162 algo = hash_used_elt["algo"]
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163 if not algo:
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164 raise exceptions.DataError
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165 return algo
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166
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167 def build_hash_elt(self, hash_, algo=ALGO_DEFAULT):
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168 """Compute hash and build hash element
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169
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170 @param hash_(str): hash to use
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171 @param algo(unicode): algorithme to use, must be a key of XEP_0300.ALGOS
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172 @return (domish.Element): computed hash
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173 """
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174 assert hash_
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175 assert algo
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176 hash_elt = domish.Element((NS_HASHES, "hash"))
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177 if hash_ is not None:
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178 b64_hash = base64.b64encode(hash_.encode('utf-8')).decode('utf-8')
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179 hash_elt.addContent(b64_hash)
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180 hash_elt["algo"] = algo
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181 return hash_elt
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182
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183 def parse_hash_elt(self, parent: domish.Element) -> Tuple[str, bytes]:
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184 """Find and parse a hash element
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185
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186 if multiple elements are found, the strongest managed one is returned
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187 @param parent: parent of <hash/> element
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188 @return: (algo, hash) tuple
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189 both values can be None if <hash/> is empty
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190 @raise exceptions.NotFound: the element is not present
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191 @raise exceptions.DataError: the element is invalid
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192 """
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193 algos = list(XEP_0300.ALGOS.keys())
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194 hash_elt = None
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195 best_algo = None
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196 best_value = None
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197 for hash_elt in parent.elements(NS_HASHES, "hash"):
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198 algo = hash_elt.getAttribute("algo")
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199 try:
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200 idx = algos.index(algo)
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201 except ValueError:
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202 log.warning(f"Proposed {algo} algorithm is not managed")
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203 algo = None
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204 continue
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205
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206 if best_algo is None or algos.index(best_algo) < idx:
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207 best_algo = algo
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208 best_value = base64.b64decode(str(hash_elt)).decode('utf-8')
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209
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210 if not hash_elt:
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211 raise exceptions.NotFound
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212 if not best_algo or not best_value:
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213 raise exceptions.DataError
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214 return best_algo, best_value
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215
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216
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217 @implementer(iwokkel.IDisco)
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218 class XEP_0300_handler(XMPPHandler):
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219
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220 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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221 hash_functions_names = [
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222 disco.DiscoFeature(NS_HASHES_FUNCTIONS.format(algo))
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223 for algo in XEP_0300.ALGOS
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224 ]
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225 return [disco.DiscoFeature(NS_HASHES)] + hash_functions_names
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226
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227 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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228 return []