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annotate sat/tools/common/tls.py @ 3287:a4b8c9bcfb57

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tools/common (tls): moved re-usable Twisted TLS code from Libervia to tools/common
author Goffi <goffi@goffi.org>
date Fri, 29 May 2020 21:07:10 +0200
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children 4dbf9fcbf26d
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3287
a4b8c9bcfb57 tools/common (tls): moved re-usable Twisted TLS code from Libervia to tools/common
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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 twisted.internet import reactor
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22 from sat.core.log import getLogger
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23 from sat.core import exceptions
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24 from sat.tools import config as tools_config
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25
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26
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27 try:
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28 import OpenSSL
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29 from twisted.internet import ssl
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30 except ImportError:
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31 ssl = None
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32
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33
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34 log = getLogger(__name__)
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35
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36
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37 def getOptionsFromConfig(config, section=""):
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38 options = {}
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39 for option in ('tls_certificate', 'tls_private_key', 'tls_chain'):
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40 options[option] = tools_config.getConfig(config, section, option)
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41 return options
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42
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43
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44 def TLSOptionsCheck(options):
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45 """Check options coherence if TLS is activated, and update missing values
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46
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47 Must be called only if TLS is activated
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48 """
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49 if not options["tls_certificate"]:
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50 raise exceptions.ConfigError(
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51 "a TLS certificate is needed to activate HTTPS connection")
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52 if not options["tls_private_key"]:
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53 options["tls_private_key"] = options["tls_certificate"]
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54
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55
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56 def loadCertificates(f):
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57 """Read a .pem file with a list of certificates
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58
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59 @param f (file): file obj (opened .pem file)
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60 @return (list[OpenSSL.crypto.X509]): list of certificates
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61 @raise OpenSSL.crypto.Error: error while parsing the file
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62 """
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63 # XXX: didn't found any method to load a .pem file with several certificates
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64 # so the certificates split is done here
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65 certificates = []
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66 buf = []
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67 while True:
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68 line = f.readline()
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69 buf.append(line)
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70 if "-----END CERTIFICATE-----" in line:
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71 certificates.append(
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72 OpenSSL.crypto.load_certificate(
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73 OpenSSL.crypto.FILETYPE_PEM, "".join(buf)
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74 )
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75 )
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76 buf = []
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77 elif not line:
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78 log.debug(f"{len(certificates)} certificate(s) found")
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79 return certificates
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80
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81
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82 def loadPKey(f):
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83 """Read a private key from a .pem file
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84
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85 @param f (file): file obj (opened .pem file)
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86 @return (list[OpenSSL.crypto.PKey]): private key object
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87 @raise OpenSSL.crypto.Error: error while parsing the file
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88 """
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89 return OpenSSL.crypto.load_privatekey(OpenSSL.crypto.FILETYPE_PEM, f.read())
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90
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91
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92 def loadCertificate(f):
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93 """Read a public certificate from a .pem file
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94
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95 @param f (file): file obj (opened .pem file)
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96 @return (list[OpenSSL.crypto.X509]): public certificate
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97 @raise OpenSSL.crypto.Error: error while parsing the file
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98 """
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99 return OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM, f.read())
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100
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101
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102 def getTLSContextFactory(options):
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103 """Load TLS certificate and build the context factory needed for listenSSL"""
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104 if ssl is None:
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105 raise ImportError("Python module pyOpenSSL is not installed!")
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106
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107 cert_options = {}
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108
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109 for name, option, method in [
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110 ("privateKey", "tls_private_key", loadPKey),
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111 ("certificate", "tls_certificate", loadCertificate),
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112 ("extraCertChain", "tls_chain", loadCertificates),
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113 ]:
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114 path = options[option]
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115 if not path:
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116 assert option == "tls_chain"
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117 continue
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118 log.debug(f"loading {option} from {path}")
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119 try:
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120 with open(path) as f:
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121 cert_options[name] = method(f)
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122 except IOError as e:
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123 raise exceptions.DataError(
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124 f"Error while reading file {path} for option {option}: {e}"
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125 )
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126 except OpenSSL.crypto.Error:
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127 raise exceptions.DataError(
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128 f"Error while parsing file {path} for option {option}, are you sure "
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129 f"it is a valid .pem file?"
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130 )
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131 if (
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132 option == "tls_private_key"
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133 and options["tls_certificate"] == path
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134 ):
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135 raise exceptions.ConfigError(
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136 f"You are using the same file for private key and public "
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137 f"certificate, make sure that both a in {path} or use "
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138 f"--tls_private_key option"
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139 )
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140
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141 return ssl.CertificateOptions(**cert_options)