Mercurial > libervia-backend

annotate sat/tools/common/tls.py @ 3405:ecdb3728749e

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plugin XEP-0353: Jingle Message Initiation implementation: This plugin uses the new `XEP-0166_initiate` trigger to initiate a Jingle session with messages if the peer jid has no resource specified. On reception, if the sender is not in our roster, a confirmation is requested to user to avoid leaking presence and IP. If user refuses the session for somebody not in roster, nothing is sent at all (the request is just ignored).
author Goffi <goffi@goffi.org>
date Thu, 12 Nov 2020 14:53:15 +0100
parents 4dbf9fcbf26d
children be6d91572633
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3287
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1 #!/usr/bin/env python3
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2
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3 # SàT: a XMPP client
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4 # Copyright (C) 2009-2020 Jérôme Poisson (goffi@goffi.org)
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5
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6 # This program is free software: you can redistribute it and/or modify
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7 # it under the terms of the GNU Affero General Public License as published by
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8 # the Free Software Foundation, either version 3 of the License, or
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9 # (at your option) any later version.
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10
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11 # This program is distributed in the hope that it will be useful,
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12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 # GNU Affero General Public License for more details.
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15
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16 # You should have received a copy of the GNU Affero General Public License
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17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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18
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19 """TLS handling with twisted"""
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20
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21 from sat.core.log import getLogger
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22 from sat.core import exceptions
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23 from sat.tools import config as tools_config
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25
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26 try:
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27 import OpenSSL
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28 from twisted.internet import ssl
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29 except ImportError:
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30 ssl = None
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31
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32
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33 log = getLogger(__name__)
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34
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35
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36 def getOptionsFromConfig(config, section=""):
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37 options = {}
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38 for option in ('tls_certificate', 'tls_private_key', 'tls_chain'):
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39 options[option] = tools_config.getConfig(config, section, option)
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40 return options
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41
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42
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43 def TLSOptionsCheck(options):
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44 """Check options coherence if TLS is activated, and update missing values
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45
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46 Must be called only if TLS is activated
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47 """
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48 if not options["tls_certificate"]:
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49 raise exceptions.ConfigError(
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50 "a TLS certificate is needed to activate HTTPS connection")
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51 if not options["tls_private_key"]:
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52 options["tls_private_key"] = options["tls_certificate"]
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53
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54
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55 def loadCertificates(f):
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56 """Read a .pem file with a list of certificates
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57
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58 @param f (file): file obj (opened .pem file)
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59 @return (list[OpenSSL.crypto.X509]): list of certificates
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60 @raise OpenSSL.crypto.Error: error while parsing the file
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61 """
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62 # XXX: didn't found any method to load a .pem file with several certificates
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63 # so the certificates split is done here
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64 certificates = []
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65 buf = []
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66 while True:
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67 line = f.readline()
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68 buf.append(line)
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69 if "-----END CERTIFICATE-----" in line:
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70 certificates.append(
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71 OpenSSL.crypto.load_certificate(
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72 OpenSSL.crypto.FILETYPE_PEM, "".join(buf)
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73 )
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74 )
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75 buf = []
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76 elif not line:
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77 log.debug(f"{len(certificates)} certificate(s) found")
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78 return certificates
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79
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80
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81 def loadPKey(f):
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82 """Read a private key from a .pem file
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83
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84 @param f (file): file obj (opened .pem file)
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85 @return (list[OpenSSL.crypto.PKey]): private key object
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86 @raise OpenSSL.crypto.Error: error while parsing the file
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87 """
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88 return OpenSSL.crypto.load_privatekey(OpenSSL.crypto.FILETYPE_PEM, f.read())
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89
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90
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91 def loadCertificate(f):
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92 """Read a public certificate from a .pem file
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93
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94 @param f (file): file obj (opened .pem file)
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95 @return (list[OpenSSL.crypto.X509]): public certificate
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96 @raise OpenSSL.crypto.Error: error while parsing the file
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97 """
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98 return OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM, f.read())
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99
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100
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101 def getTLSContextFactory(options):
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102 """Load TLS certificate and build the context factory needed for listenSSL"""
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103 if ssl is None:
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104 raise ImportError("Python module pyOpenSSL is not installed!")
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105
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106 cert_options = {}
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107
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108 for name, option, method in [
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109 ("privateKey", "tls_private_key", loadPKey),
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110 ("certificate", "tls_certificate", loadCertificate),
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111 ("extraCertChain", "tls_chain", loadCertificates),
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112 ]:
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113 path = options[option]
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114 if not path:
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115 assert option == "tls_chain"
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116 continue
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117 log.debug(f"loading {option} from {path}")
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118 try:
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119 with open(path) as f:
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120 cert_options[name] = method(f)
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121 except IOError as e:
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122 raise exceptions.DataError(
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123 f"Error while reading file {path} for option {option}: {e}"
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124 )
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125 except OpenSSL.crypto.Error:
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126 raise exceptions.DataError(
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127 f"Error while parsing file {path} for option {option}, are you sure "
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128 f"it is a valid .pem file?"
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129 )
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130 if (
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131 option == "tls_private_key"
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132 and options["tls_certificate"] == path
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133 ):
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134 raise exceptions.ConfigError(
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135 f"You are using the same file for private key and public "
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136 f"certificate, make sure that both a in {path} or use "
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137 f"--tls_private_key option"
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138 )
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139
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140 return ssl.CertificateOptions(**cert_options)