annotate libervia/backend/tools/common/tls.py @ 4094:c3b68fdc2de7

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 # Libervia: an XMPP client
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4 # Copyright (C) 2009-2021 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 libervia.backend.core.log import getLogger
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22 from libervia.backend.core import exceptions
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23 from libervia.backend.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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33 log = getLogger(__name__)
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35
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36 def get_options_from_config(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.config_get(config, section, option)
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40 return options
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42
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43 def tls_options_check(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 load_certificates(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 load_p_key(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 load_certificate(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 get_tls_context_factory(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", load_p_key),
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110 ("certificate", "tls_certificate", load_certificate),
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111 ("extraCertChain", "tls_chain", load_certificates),
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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)