Mercurial > hg
annotate mercurial/sslutil.py @ 33229:dd50a370c8cb
configitems: register the 'patch.eol' config
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Fri, 30 Jun 2017 03:43:35 +0200 |
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1 # sslutil.py - SSL handling for mercurial |
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2 # |
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3 # Copyright 2005, 2006, 2007, 2008 Matt Mackall <mpm@selenic.com> |
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4 # Copyright 2006, 2007 Alexis S. L. Carvalho <alexis@cecm.usp.br> |
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5 # Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com> |
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6 # |
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7 # This software may be used and distributed according to the terms of the |
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8 # GNU General Public License version 2 or any later version. |
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9 |
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10 from __future__ import absolute_import |
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11 |
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12 import hashlib |
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13 import os |
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14 import re |
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15 import ssl |
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16 |
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17 from .i18n import _ |
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18 from . import ( |
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19 error, |
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20 pycompat, |
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21 util, |
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22 ) |
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23 |
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24 # Python 2.7.9+ overhauled the built-in SSL/TLS features of Python. It added |
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25 # support for TLS 1.1, TLS 1.2, SNI, system CA stores, etc. These features are |
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26 # all exposed via the "ssl" module. |
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27 # |
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28 # Depending on the version of Python being used, SSL/TLS support is either |
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29 # modern/secure or legacy/insecure. Many operations in this module have |
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30 # separate code paths depending on support in Python. |
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31 |
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32 configprotocols = { |
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33 'tls1.0', |
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34 'tls1.1', |
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35 'tls1.2', |
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36 } |
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37 |
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38 hassni = getattr(ssl, 'HAS_SNI', False) |
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39 |
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40 # TLS 1.1 and 1.2 may not be supported if the OpenSSL Python is compiled |
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41 # against doesn't support them. |
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42 supportedprotocols = {'tls1.0'} |
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43 if util.safehasattr(ssl, 'PROTOCOL_TLSv1_1'): |
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44 supportedprotocols.add('tls1.1') |
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45 if util.safehasattr(ssl, 'PROTOCOL_TLSv1_2'): |
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46 supportedprotocols.add('tls1.2') |
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47 |
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48 try: |
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49 # ssl.SSLContext was added in 2.7.9 and presence indicates modern |
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50 # SSL/TLS features are available. |
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51 SSLContext = ssl.SSLContext |
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52 modernssl = True |
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53 _canloaddefaultcerts = util.safehasattr(SSLContext, 'load_default_certs') |
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54 except AttributeError: |
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55 modernssl = False |
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56 _canloaddefaultcerts = False |
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57 |
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58 # We implement SSLContext using the interface from the standard library. |
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59 class SSLContext(object): |
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60 def __init__(self, protocol): |
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61 # From the public interface of SSLContext |
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62 self.protocol = protocol |
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63 self.check_hostname = False |
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64 self.options = 0 |
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65 self.verify_mode = ssl.CERT_NONE |
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66 |
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67 # Used by our implementation. |
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68 self._certfile = None |
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69 self._keyfile = None |
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70 self._certpassword = None |
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71 self._cacerts = None |
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72 self._ciphers = None |
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73 |
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74 def load_cert_chain(self, certfile, keyfile=None, password=None): |
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75 self._certfile = certfile |
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76 self._keyfile = keyfile |
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77 self._certpassword = password |
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78 |
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79 def load_default_certs(self, purpose=None): |
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80 pass |
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81 |
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82 def load_verify_locations(self, cafile=None, capath=None, cadata=None): |
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83 if capath: |
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84 raise error.Abort(_('capath not supported')) |
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85 if cadata: |
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86 raise error.Abort(_('cadata not supported')) |
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87 |
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88 self._cacerts = cafile |
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89 |
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90 def set_ciphers(self, ciphers): |
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91 self._ciphers = ciphers |
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92 |
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93 def wrap_socket(self, socket, server_hostname=None, server_side=False): |
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94 # server_hostname is unique to SSLContext.wrap_socket and is used |
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95 # for SNI in that context. So there's nothing for us to do with it |
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96 # in this legacy code since we don't support SNI. |
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97 |
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98 args = { |
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99 'keyfile': self._keyfile, |
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100 'certfile': self._certfile, |
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101 'server_side': server_side, |
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102 'cert_reqs': self.verify_mode, |
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103 'ssl_version': self.protocol, |
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104 'ca_certs': self._cacerts, |
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105 'ciphers': self._ciphers, |
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106 } |
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107 |
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108 return ssl.wrap_socket(socket, **args) |
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109 |
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110 def _hostsettings(ui, hostname): |
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111 """Obtain security settings for a hostname. |
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112 |
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113 Returns a dict of settings relevant to that hostname. |
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114 """ |
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115 s = { |
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116 # Whether we should attempt to load default/available CA certs |
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117 # if an explicit ``cafile`` is not defined. |
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118 'allowloaddefaultcerts': True, |
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119 # List of 2-tuple of (hash algorithm, hash). |
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120 'certfingerprints': [], |
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121 # Path to file containing concatenated CA certs. Used by |
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122 # SSLContext.load_verify_locations(). |
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123 'cafile': None, |
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124 # Whether certificate verification should be disabled. |
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125 'disablecertverification': False, |
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126 # Whether the legacy [hostfingerprints] section has data for this host. |
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127 'legacyfingerprint': False, |
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128 # PROTOCOL_* constant to use for SSLContext.__init__. |
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129 'protocol': None, |
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130 # String representation of minimum protocol to be used for UI |
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131 # presentation. |
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132 'protocolui': None, |
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133 # ssl.CERT_* constant used by SSLContext.verify_mode. |
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134 'verifymode': None, |
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135 # Defines extra ssl.OP* bitwise options to set. |
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136 'ctxoptions': None, |
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137 # OpenSSL Cipher List to use (instead of default). |
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138 'ciphers': None, |
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139 } |
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140 |
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141 # Allow minimum TLS protocol to be specified in the config. |
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142 def validateprotocol(protocol, key): |
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143 if protocol not in configprotocols: |
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144 raise error.Abort( |
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145 _('unsupported protocol from hostsecurity.%s: %s') % |
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146 (key, protocol), |
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147 hint=_('valid protocols: %s') % |
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148 ' '.join(sorted(configprotocols))) |
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149 |
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150 # We default to TLS 1.1+ where we can because TLS 1.0 has known |
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151 # vulnerabilities (like BEAST and POODLE). We allow users to downgrade to |
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152 # TLS 1.0+ via config options in case a legacy server is encountered. |
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153 if 'tls1.1' in supportedprotocols: |
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154 defaultprotocol = 'tls1.1' |
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155 else: |
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156 # Let people know they are borderline secure. |
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157 # We don't document this config option because we want people to see |
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158 # the bold warnings on the web site. |
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159 # internal config: hostsecurity.disabletls10warning |
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160 if not ui.configbool('hostsecurity', 'disabletls10warning'): |
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161 ui.warn(_('warning: connecting to %s using legacy security ' |
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162 'technology (TLS 1.0); see ' |
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163 'https://mercurial-scm.org/wiki/SecureConnections for ' |
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164 'more info\n') % hostname) |
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165 defaultprotocol = 'tls1.0' |
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166 |
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167 key = 'minimumprotocol' |
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168 protocol = ui.config('hostsecurity', key, defaultprotocol) |
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169 validateprotocol(protocol, key) |
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170 |
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171 key = '%s:minimumprotocol' % hostname |
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172 protocol = ui.config('hostsecurity', key, protocol) |
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173 validateprotocol(protocol, key) |
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174 |
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175 # If --insecure is used, we allow the use of TLS 1.0 despite config options. |
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176 # We always print a "connection security to %s is disabled..." message when |
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177 # --insecure is used. So no need to print anything more here. |
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178 if ui.insecureconnections: |
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179 protocol = 'tls1.0' |
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180 |
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181 s['protocol'], s['ctxoptions'], s['protocolui'] = protocolsettings(protocol) |
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182 |
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183 ciphers = ui.config('hostsecurity', 'ciphers') |
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184 ciphers = ui.config('hostsecurity', '%s:ciphers' % hostname, ciphers) |
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185 s['ciphers'] = ciphers |
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186 |
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187 # Look for fingerprints in [hostsecurity] section. Value is a list |
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188 # of <alg>:<fingerprint> strings. |
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189 fingerprints = ui.configlist('hostsecurity', '%s:fingerprints' % hostname, |
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190 []) |
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191 for fingerprint in fingerprints: |
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192 if not (fingerprint.startswith(('sha1:', 'sha256:', 'sha512:'))): |
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193 raise error.Abort(_('invalid fingerprint for %s: %s') % ( |
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194 hostname, fingerprint), |
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195 hint=_('must begin with "sha1:", "sha256:", ' |
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196 'or "sha512:"')) |
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197 |
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198 alg, fingerprint = fingerprint.split(':', 1) |
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199 fingerprint = fingerprint.replace(':', '').lower() |
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200 s['certfingerprints'].append((alg, fingerprint)) |
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201 |
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202 # Fingerprints from [hostfingerprints] are always SHA-1. |
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203 for fingerprint in ui.configlist('hostfingerprints', hostname, []): |
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204 fingerprint = fingerprint.replace(':', '').lower() |
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205 s['certfingerprints'].append(('sha1', fingerprint)) |
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206 s['legacyfingerprint'] = True |
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207 |
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208 # If a host cert fingerprint is defined, it is the only thing that |
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209 # matters. No need to validate CA certs. |
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210 if s['certfingerprints']: |
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211 s['verifymode'] = ssl.CERT_NONE |
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212 s['allowloaddefaultcerts'] = False |
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213 |
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214 # If --insecure is used, don't take CAs into consideration. |
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215 elif ui.insecureconnections: |
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216 s['disablecertverification'] = True |
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217 s['verifymode'] = ssl.CERT_NONE |
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218 s['allowloaddefaultcerts'] = False |
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219 |
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220 if ui.configbool('devel', 'disableloaddefaultcerts'): |
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221 s['allowloaddefaultcerts'] = False |
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222 |
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223 # If both fingerprints and a per-host ca file are specified, issue a warning |
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224 # because users should not be surprised about what security is or isn't |
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225 # being performed. |
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226 cafile = ui.config('hostsecurity', '%s:verifycertsfile' % hostname) |
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227 if s['certfingerprints'] and cafile: |
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228 ui.warn(_('(hostsecurity.%s:verifycertsfile ignored when host ' |
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229 'fingerprints defined; using host fingerprints for ' |
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230 'verification)\n') % hostname) |
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231 |
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232 # Try to hook up CA certificate validation unless something above |
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233 # makes it not necessary. |
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234 if s['verifymode'] is None: |
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235 # Look at per-host ca file first. |
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236 if cafile: |
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237 cafile = util.expandpath(cafile) |
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238 if not os.path.exists(cafile): |
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239 raise error.Abort(_('path specified by %s does not exist: %s') % |
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240 ('hostsecurity.%s:verifycertsfile' % hostname, |
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241 cafile)) |
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242 s['cafile'] = cafile |
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243 else: |
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244 # Find global certificates file in config. |
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245 cafile = ui.config('web', 'cacerts') |
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246 |
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247 if cafile: |
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248 cafile = util.expandpath(cafile) |
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249 if not os.path.exists(cafile): |
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250 raise error.Abort(_('could not find web.cacerts: %s') % |
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251 cafile) |
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252 elif s['allowloaddefaultcerts']: |
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253 # CAs not defined in config. Try to find system bundles. |
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254 cafile = _defaultcacerts(ui) |
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255 if cafile: |
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256 ui.debug('using %s for CA file\n' % cafile) |
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257 |
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258 s['cafile'] = cafile |
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259 |
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260 # Require certificate validation if CA certs are being loaded and |
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261 # verification hasn't been disabled above. |
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262 if cafile or (_canloaddefaultcerts and s['allowloaddefaultcerts']): |
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263 s['verifymode'] = ssl.CERT_REQUIRED |
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264 else: |
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265 # At this point we don't have a fingerprint, aren't being |
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266 # explicitly insecure, and can't load CA certs. Connecting |
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267 # is insecure. We allow the connection and abort during |
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268 # validation (once we have the fingerprint to print to the |
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269 # user). |
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270 s['verifymode'] = ssl.CERT_NONE |
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271 |
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272 assert s['protocol'] is not None |
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273 assert s['ctxoptions'] is not None |
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274 assert s['verifymode'] is not None |
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275 |
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276 return s |
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277 |
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278 def protocolsettings(protocol): |
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279 """Resolve the protocol for a config value. |
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280 |
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281 Returns a 3-tuple of (protocol, options, ui value) where the first |
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282 2 items are values used by SSLContext and the last is a string value |
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283 of the ``minimumprotocol`` config option equivalent. |
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284 """ |
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285 if protocol not in configprotocols: |
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286 raise ValueError('protocol value not supported: %s' % protocol) |
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287 |
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288 # Despite its name, PROTOCOL_SSLv23 selects the highest protocol |
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289 # that both ends support, including TLS protocols. On legacy stacks, |
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290 # the highest it likely goes is TLS 1.0. On modern stacks, it can |
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291 # support TLS 1.2. |
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292 # |
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293 # The PROTOCOL_TLSv* constants select a specific TLS version |
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294 # only (as opposed to multiple versions). So the method for |
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295 # supporting multiple TLS versions is to use PROTOCOL_SSLv23 and |
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296 # disable protocols via SSLContext.options and OP_NO_* constants. |
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297 # However, SSLContext.options doesn't work unless we have the |
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298 # full/real SSLContext available to us. |
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299 if supportedprotocols == {'tls1.0'}: |
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300 if protocol != 'tls1.0': |
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301 raise error.Abort(_('current Python does not support protocol ' |
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302 'setting %s') % protocol, |
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303 hint=_('upgrade Python or disable setting since ' |
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304 'only TLS 1.0 is supported')) |
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305 |
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306 return ssl.PROTOCOL_TLSv1, 0, 'tls1.0' |
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307 |
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308 # WARNING: returned options don't work unless the modern ssl module |
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309 # is available. Be careful when adding options here. |
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310 |
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311 # SSLv2 and SSLv3 are broken. We ban them outright. |
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312 options = ssl.OP_NO_SSLv2 | ssl.OP_NO_SSLv3 |
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313 |
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314 if protocol == 'tls1.0': |
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315 # Defaults above are to use TLS 1.0+ |
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316 pass |
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317 elif protocol == 'tls1.1': |
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318 options |= ssl.OP_NO_TLSv1 |
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319 elif protocol == 'tls1.2': |
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320 options |= ssl.OP_NO_TLSv1 | ssl.OP_NO_TLSv1_1 |
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321 else: |
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322 raise error.Abort(_('this should not happen')) |
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323 |
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324 # Prevent CRIME. |
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325 # There is no guarantee this attribute is defined on the module. |
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326 options |= getattr(ssl, 'OP_NO_COMPRESSION', 0) |
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327 |
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328 return ssl.PROTOCOL_SSLv23, options, protocol |
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329 |
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330 def wrapsocket(sock, keyfile, certfile, ui, serverhostname=None): |
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331 """Add SSL/TLS to a socket. |
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332 |
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333 This is a glorified wrapper for ``ssl.wrap_socket()``. It makes sane |
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334 choices based on what security options are available. |
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335 |
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336 In addition to the arguments supported by ``ssl.wrap_socket``, we allow |
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337 the following additional arguments: |
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338 |
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339 * serverhostname - The expected hostname of the remote server. If the |
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340 server (and client) support SNI, this tells the server which certificate |
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341 to use. |
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342 """ |
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sslutil: require serverhostname argument (API)
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diff
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343 if not serverhostname: |
29389
98e8313dcd9e
i18n: translate abort messages
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diff
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344 raise error.Abort(_('serverhostname argument is required')) |
29224
7424f4294199
sslutil: require serverhostname argument (API)
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diff
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345 |
29259
ec247e8595f9
sslutil: move SSLContext.verify_mode value into _hostsettings
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diff
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346 settings = _hostsettings(ui, serverhostname) |
29249
cca59ef27e60
sslutil: move sslkwargs logic into internal function (API)
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347 |
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348 # We can't use ssl.create_default_context() because it calls |
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349 # load_default_certs() unless CA arguments are passed to it. We want to |
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350 # have explicit control over CA loading because implicitly loading |
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351 # CAs may undermine the user's intent. For example, a user may define a CA |
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352 # bundle with a specific CA cert removed. If the system/default CA bundle |
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353 # is loaded and contains that removed CA, you've just undone the user's |
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354 # choice. |
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sslutil: move protocol determination to _hostsettings
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355 sslcontext = SSLContext(settings['protocol']) |
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sslutil: move protocol determination to _hostsettings
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356 |
29508
d65ec41b6384
sslutil: move context options flags to _hostsettings
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357 # This is a no-op unless using modern ssl. |
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diff
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358 sslcontext.options |= settings['ctxoptions'] |
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4827d07073e6
sslutil: always use SSLContext
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diff
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359 |
28848
e330db205b20
sslutil: move and document verify_mode assignment
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diff
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360 # This still works on our fake SSLContext. |
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70bc9912d83d
sslutil: move CA file processing into _hostsettings()
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diff
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361 sslcontext.verify_mode = settings['verifymode'] |
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e330db205b20
sslutil: move and document verify_mode assignment
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362 |
29577
9654ef41f7cc
sslutil: support defining cipher list
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diff
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|
363 if settings['ciphers']: |
9654ef41f7cc
sslutil: support defining cipher list
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diff
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364 try: |
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diff
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365 sslcontext.set_ciphers(settings['ciphers']) |
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sslutil: support defining cipher list
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366 except ssl.SSLError as e: |
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diff
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367 raise error.Abort(_('could not set ciphers: %s') % e.args[0], |
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sslutil: support defining cipher list
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368 hint=_('change cipher string (%s) in config') % |
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sslutil: support defining cipher list
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diff
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369 settings['ciphers']) |
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370 |
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c617614aefd2
sslutil: remove indentation in wrapsocket declaration
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371 if certfile is not None: |
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diff
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372 def password(): |
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373 f = keyfile or certfile |
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374 return ui.getpass(_('passphrase for %s: ') % f, '') |
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diff
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375 sslcontext.load_cert_chain(certfile, keyfile, password) |
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e330db205b20
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diff
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376 |
29260
70bc9912d83d
sslutil: move CA file processing into _hostsettings()
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diff
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377 if settings['cafile'] is not None: |
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2f7f1e10f840
sslutil: display a better error message when CA file loading fails
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diff
changeset
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378 try: |
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379 sslcontext.load_verify_locations(cafile=settings['cafile']) |
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diff
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380 except ssl.SSLError as e: |
29927
799e36749f1a
ssl: handle a difference in SSLError with pypy (issue5348)
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
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29631
diff
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|
381 if len(e.args) == 1: # pypy has different SSLError args |
799e36749f1a
ssl: handle a difference in SSLError with pypy (issue5348)
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diff
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|
382 msg = e.args[0] |
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ssl: handle a difference in SSLError with pypy (issue5348)
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diff
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|
383 else: |
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ssl: handle a difference in SSLError with pypy (issue5348)
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diff
changeset
|
384 msg = e.args[1] |
29446
2f7f1e10f840
sslutil: display a better error message when CA file loading fails
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diff
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|
385 raise error.Abort(_('error loading CA file %s: %s') % ( |
29927
799e36749f1a
ssl: handle a difference in SSLError with pypy (issue5348)
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diff
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|
386 settings['cafile'], msg), |
29446
2f7f1e10f840
sslutil: display a better error message when CA file loading fails
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diff
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|
387 hint=_('file is empty or malformed?')) |
29113
5b9577edf745
sslutil: use CA loaded state to drive validation logic
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
388 caloaded = True |
29288
7dee15dee53c
sslutil: add devel.disableloaddefaultcerts to disable CA loading
Gregory Szorc <gregory.szorc@gmail.com>
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diff
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|
389 elif settings['allowloaddefaultcerts']: |
28652
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390 # This is a no-op on old Python. |
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|
391 sslcontext.load_default_certs() |
29288
7dee15dee53c
sslutil: add devel.disableloaddefaultcerts to disable CA loading
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diff
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|
392 caloaded = True |
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diff
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|
393 else: |
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sslutil: add devel.disableloaddefaultcerts to disable CA loading
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diff
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|
394 caloaded = False |
23834
bf07c19b4c82
https: support tls sni (server name indication) for https urls (issue3090)
Alex Orange <crazycasta@gmail.com>
parents:
23069
diff
changeset
|
395 |
29449
5b71a8d7f7ff
sslutil: emit warning when no CA certificates loaded
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diff
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|
396 try: |
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diff
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|
397 sslsocket = sslcontext.wrap_socket(sock, server_hostname=serverhostname) |
29559
7dec5e441bf7
sslutil: config option to specify TLS protocol version
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parents:
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diff
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|
398 except ssl.SSLError as e: |
29449
5b71a8d7f7ff
sslutil: emit warning when no CA certificates loaded
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diff
changeset
|
399 # If we're doing certificate verification and no CA certs are loaded, |
5b71a8d7f7ff
sslutil: emit warning when no CA certificates loaded
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diff
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|
400 # that is almost certainly the reason why verification failed. Provide |
5b71a8d7f7ff
sslutil: emit warning when no CA certificates loaded
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diff
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|
401 # a hint to the user. |
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sslutil: emit warning when no CA certificates loaded
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diff
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|
402 # Only modern ssl module exposes SSLContext.get_ca_certs() so we can |
5b71a8d7f7ff
sslutil: emit warning when no CA certificates loaded
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parents:
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diff
changeset
|
403 # only show this warning if modern ssl is available. |
31725
c777b12cdc9b
sslutil: clarify internal documentation
Matt Harbison <matt_harbison@yahoo.com>
parents:
31290
diff
changeset
|
404 # The exception handler is here to handle bugs around cert attributes: |
c777b12cdc9b
sslutil: clarify internal documentation
Matt Harbison <matt_harbison@yahoo.com>
parents:
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diff
changeset
|
405 # https://bugs.python.org/issue20916#msg213479. (See issues5313.) |
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diff
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|
406 # When the main 20916 bug occurs, 'sslcontext.get_ca_certs()' is a |
c777b12cdc9b
sslutil: clarify internal documentation
Matt Harbison <matt_harbison@yahoo.com>
parents:
31290
diff
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|
407 # non-empty list, but the following conditional is otherwise True. |
29631
387bdd53c77e
sslutil: work around SSLContext.get_ca_certs bug on Windows (issue5313)
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parents:
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diff
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|
408 try: |
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diff
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|
409 if (caloaded and settings['verifymode'] == ssl.CERT_REQUIRED and |
387bdd53c77e
sslutil: work around SSLContext.get_ca_certs bug on Windows (issue5313)
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diff
changeset
|
410 modernssl and not sslcontext.get_ca_certs()): |
387bdd53c77e
sslutil: work around SSLContext.get_ca_certs bug on Windows (issue5313)
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parents:
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diff
changeset
|
411 ui.warn(_('(an attempt was made to load CA certificates but ' |
387bdd53c77e
sslutil: work around SSLContext.get_ca_certs bug on Windows (issue5313)
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diff
changeset
|
412 'none were loaded; see ' |
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diff
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|
413 'https://mercurial-scm.org/wiki/SecureConnections ' |
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sslutil: work around SSLContext.get_ca_certs bug on Windows (issue5313)
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diff
changeset
|
414 'for how to configure Mercurial to avoid this ' |
387bdd53c77e
sslutil: work around SSLContext.get_ca_certs bug on Windows (issue5313)
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diff
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|
415 'error)\n')) |
387bdd53c77e
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diff
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|
416 except ssl.SSLError: |
387bdd53c77e
sslutil: work around SSLContext.get_ca_certs bug on Windows (issue5313)
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diff
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|
417 pass |
29559
7dec5e441bf7
sslutil: config option to specify TLS protocol version
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|
418 # Try to print more helpful error messages for known failures. |
7dec5e441bf7
sslutil: config option to specify TLS protocol version
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diff
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|
419 if util.safehasattr(e, 'reason'): |
29619
53e80179bd6a
sslutil: improve messaging around unsupported protocols (issue5303)
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parents:
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diff
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|
420 # This error occurs when the client and server don't share a |
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diff
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421 # common/supported SSL/TLS protocol. We've disabled SSLv2 and SSLv3 |
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422 # outright. Hopefully the reason for this error is that we require |
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diff
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|
423 # TLS 1.1+ and the server only supports TLS 1.0. Whatever the |
53e80179bd6a
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diff
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|
424 # reason, try to emit an actionable warning. |
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7dec5e441bf7
sslutil: config option to specify TLS protocol version
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|
425 if e.reason == 'UNSUPPORTED_PROTOCOL': |
29619
53e80179bd6a
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|
426 # We attempted TLS 1.0+. |
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|
427 if settings['protocolui'] == 'tls1.0': |
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|
428 # We support more than just TLS 1.0+. If this happens, |
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|
429 # the likely scenario is either the client or the server |
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|
430 # is really old. (e.g. server doesn't support TLS 1.0+ or |
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|
431 # client doesn't support modern TLS versions introduced |
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diff
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|
432 # several years from when this comment was written). |
32291
bd872f64a8ba
cleanup: use set literals
Martin von Zweigbergk <martinvonz@google.com>
parents:
32273
diff
changeset
|
433 if supportedprotocols != {'tls1.0'}: |
29619
53e80179bd6a
sslutil: improve messaging around unsupported protocols (issue5303)
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diff
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|
434 ui.warn(_( |
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diff
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|
435 '(could not communicate with %s using security ' |
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diff
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|
436 'protocols %s; if you are using a modern Mercurial ' |
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sslutil: improve messaging around unsupported protocols (issue5303)
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diff
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|
437 'version, consider contacting the operator of this ' |
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|
438 'server; see ' |
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|
439 'https://mercurial-scm.org/wiki/SecureConnections ' |
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sslutil: improve messaging around unsupported protocols (issue5303)
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diff
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|
440 'for more info)\n') % ( |
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diff
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|
441 serverhostname, |
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sslutil: improve messaging around unsupported protocols (issue5303)
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diff
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|
442 ', '.join(sorted(supportedprotocols)))) |
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sslutil: improve messaging around unsupported protocols (issue5303)
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diff
changeset
|
443 else: |
53e80179bd6a
sslutil: improve messaging around unsupported protocols (issue5303)
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parents:
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diff
changeset
|
444 ui.warn(_( |
53e80179bd6a
sslutil: improve messaging around unsupported protocols (issue5303)
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diff
changeset
|
445 '(could not communicate with %s using TLS 1.0; the ' |
53e80179bd6a
sslutil: improve messaging around unsupported protocols (issue5303)
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parents:
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diff
changeset
|
446 'likely cause of this is the server no longer ' |
53e80179bd6a
sslutil: improve messaging around unsupported protocols (issue5303)
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parents:
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diff
changeset
|
447 'supports TLS 1.0 because it has known security ' |
53e80179bd6a
sslutil: improve messaging around unsupported protocols (issue5303)
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diff
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|
448 'vulnerabilities; see ' |
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sslutil: improve messaging around unsupported protocols (issue5303)
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diff
changeset
|
449 'https://mercurial-scm.org/wiki/SecureConnections ' |
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sslutil: improve messaging around unsupported protocols (issue5303)
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diff
changeset
|
450 'for more info)\n') % serverhostname) |
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451 else: |
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452 # We attempted TLS 1.1+. We can only get here if the client |
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453 # supports the configured protocol. So the likely reason is |
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454 # the client wants better security than the server can |
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455 # offer. |
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456 ui.warn(_( |
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457 '(could not negotiate a common security protocol (%s+) ' |
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458 'with %s; the likely cause is Mercurial is configured ' |
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459 'to be more secure than the server can support)\n') % ( |
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460 settings['protocolui'], serverhostname)) |
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461 ui.warn(_('(consider contacting the operator of this ' |
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462 'server and ask them to support modern TLS ' |
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463 'protocol versions; or, set ' |
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464 'hostsecurity.%s:minimumprotocol=tls1.0 to allow ' |
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465 'use of legacy, less secure protocols when ' |
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466 'communicating with this server)\n') % |
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467 serverhostname) |
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468 ui.warn(_( |
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469 '(see https://mercurial-scm.org/wiki/SecureConnections ' |
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470 'for more info)\n')) |
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471 raise |
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472 |
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473 # check if wrap_socket failed silently because socket had been |
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474 # closed |
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475 # - see http://bugs.python.org/issue13721 |
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476 if not sslsocket.cipher(): |
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477 raise error.Abort(_('ssl connection failed')) |
29113
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478 |
29225
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479 sslsocket._hgstate = { |
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480 'caloaded': caloaded, |
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481 'hostname': serverhostname, |
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482 'settings': settings, |
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483 'ui': ui, |
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484 } |
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485 |
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486 return sslsocket |
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487 |
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488 def wrapserversocket(sock, ui, certfile=None, keyfile=None, cafile=None, |
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489 requireclientcert=False): |
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490 """Wrap a socket for use by servers. |
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491 |
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492 ``certfile`` and ``keyfile`` specify the files containing the certificate's |
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493 public and private keys, respectively. Both keys can be defined in the same |
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494 file via ``certfile`` (the private key must come first in the file). |
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495 |
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496 ``cafile`` defines the path to certificate authorities. |
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497 |
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498 ``requireclientcert`` specifies whether to require client certificates. |
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499 |
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500 Typically ``cafile`` is only defined if ``requireclientcert`` is true. |
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501 """ |
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502 protocol, options, _protocolui = protocolsettings('tls1.0') |
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503 |
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504 # This config option is intended for use in tests only. It is a giant |
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505 # footgun to kill security. Don't define it. |
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506 exactprotocol = ui.config('devel', 'serverexactprotocol') |
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507 if exactprotocol == 'tls1.0': |
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508 protocol = ssl.PROTOCOL_TLSv1 |
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509 elif exactprotocol == 'tls1.1': |
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510 if 'tls1.1' not in supportedprotocols: |
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511 raise error.Abort(_('TLS 1.1 not supported by this Python')) |
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512 protocol = ssl.PROTOCOL_TLSv1_1 |
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513 elif exactprotocol == 'tls1.2': |
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514 if 'tls1.2' not in supportedprotocols: |
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515 raise error.Abort(_('TLS 1.2 not supported by this Python')) |
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516 protocol = ssl.PROTOCOL_TLSv1_2 |
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517 elif exactprotocol: |
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518 raise error.Abort(_('invalid value for serverexactprotocol: %s') % |
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519 exactprotocol) |
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520 |
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521 if modernssl: |
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522 # We /could/ use create_default_context() here since it doesn't load |
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523 # CAs when configured for client auth. However, it is hard-coded to |
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524 # use ssl.PROTOCOL_SSLv23 which may not be appropriate here. |
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525 sslcontext = SSLContext(protocol) |
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526 sslcontext.options |= options |
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527 |
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528 # Improve forward secrecy. |
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529 sslcontext.options |= getattr(ssl, 'OP_SINGLE_DH_USE', 0) |
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530 sslcontext.options |= getattr(ssl, 'OP_SINGLE_ECDH_USE', 0) |
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531 |
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532 # Use the list of more secure ciphers if found in the ssl module. |
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533 if util.safehasattr(ssl, '_RESTRICTED_SERVER_CIPHERS'): |
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534 sslcontext.options |= getattr(ssl, 'OP_CIPHER_SERVER_PREFERENCE', 0) |
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535 sslcontext.set_ciphers(ssl._RESTRICTED_SERVER_CIPHERS) |
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536 else: |
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537 sslcontext = SSLContext(ssl.PROTOCOL_TLSv1) |
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538 |
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539 if requireclientcert: |
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540 sslcontext.verify_mode = ssl.CERT_REQUIRED |
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541 else: |
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542 sslcontext.verify_mode = ssl.CERT_NONE |
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543 |
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544 if certfile or keyfile: |
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545 sslcontext.load_cert_chain(certfile=certfile, keyfile=keyfile) |
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546 |
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547 if cafile: |
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548 sslcontext.load_verify_locations(cafile=cafile) |
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549 |
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550 return sslcontext.wrap_socket(sock, server_side=True) |
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551 |
29452
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552 class wildcarderror(Exception): |
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553 """Represents an error parsing wildcards in DNS name.""" |
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554 |
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555 def _dnsnamematch(dn, hostname, maxwildcards=1): |
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556 """Match DNS names according RFC 6125 section 6.4.3. |
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557 |
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558 This code is effectively copied from CPython's ssl._dnsname_match. |
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559 |
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560 Returns a bool indicating whether the expected hostname matches |
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561 the value in ``dn``. |
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562 """ |
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563 pats = [] |
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564 if not dn: |
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565 return False |
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566 |
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567 pieces = dn.split(r'.') |
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568 leftmost = pieces[0] |
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569 remainder = pieces[1:] |
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570 wildcards = leftmost.count('*') |
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571 if wildcards > maxwildcards: |
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572 raise wildcarderror( |
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573 _('too many wildcards in certificate DNS name: %s') % dn) |
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574 |
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575 # speed up common case w/o wildcards |
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576 if not wildcards: |
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577 return dn.lower() == hostname.lower() |
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578 |
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579 # RFC 6125, section 6.4.3, subitem 1. |
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580 # The client SHOULD NOT attempt to match a presented identifier in which |
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581 # the wildcard character comprises a label other than the left-most label. |
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582 if leftmost == '*': |
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583 # When '*' is a fragment by itself, it matches a non-empty dotless |
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584 # fragment. |
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changeset
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585 pats.append('[^.]+') |
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parents:
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diff
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|
586 elif leftmost.startswith('xn--') or hostname.startswith('xn--'): |
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587 # RFC 6125, section 6.4.3, subitem 3. |
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diff
changeset
|
588 # The client SHOULD NOT attempt to match a presented identifier |
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589 # where the wildcard character is embedded within an A-label or |
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diff
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|
590 # U-label of an internationalized domain name. |
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diff
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591 pats.append(re.escape(leftmost)) |
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592 else: |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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593 # Otherwise, '*' matches any dotless string, e.g. www* |
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594 pats.append(re.escape(leftmost).replace(r'\*', '[^.]*')) |
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diff
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|
595 |
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diff
changeset
|
596 # add the remaining fragments, ignore any wildcards |
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|
597 for frag in remainder: |
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|
598 pats.append(re.escape(frag)) |
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|
599 |
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diff
changeset
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600 pat = re.compile(r'\A' + r'\.'.join(pats) + r'\Z', re.IGNORECASE) |
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601 return pat.match(hostname) is not None |
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602 |
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Augie Fackler <durin42@gmail.com>
parents:
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changeset
|
603 def _verifycert(cert, hostname): |
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|
604 '''Verify that cert (in socket.getpeercert() format) matches hostname. |
5fa21960b2f4
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|
605 CRLs is not handled. |
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|
606 |
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607 Returns error message if any problems are found and None on success. |
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diff
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|
608 ''' |
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609 if not cert: |
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610 return _('no certificate received') |
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611 |
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612 dnsnames = [] |
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613 san = cert.get('subjectAltName', []) |
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614 for key, value in san: |
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615 if key == 'DNS': |
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616 try: |
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617 if _dnsnamematch(value, hostname): |
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618 return |
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|
619 except wildcarderror as e: |
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620 return e.args[0] |
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621 |
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622 dnsnames.append(value) |
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623 |
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624 if not dnsnames: |
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|
625 # The subject is only checked when there is no DNS in subjectAltName. |
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626 for sub in cert.get('subject', []): |
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627 for key, value in sub: |
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628 # According to RFC 2818 the most specific Common Name must |
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629 # be used. |
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630 if key == 'commonName': |
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|
631 # 'subject' entries are unicode. |
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632 try: |
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633 value = value.encode('ascii') |
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634 except UnicodeEncodeError: |
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635 return _('IDN in certificate not supported') |
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636 |
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637 try: |
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638 if _dnsnamematch(value, hostname): |
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639 return |
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640 except wildcarderror as e: |
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641 return e.args[0] |
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642 |
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643 dnsnames.append(value) |
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644 |
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645 if len(dnsnames) > 1: |
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646 return _('certificate is for %s') % ', '.join(dnsnames) |
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647 elif len(dnsnames) == 1: |
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648 return _('certificate is for %s') % dnsnames[0] |
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649 else: |
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650 return _('no commonName or subjectAltName found in certificate') |
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651 |
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652 def _plainapplepython(): |
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653 """return true if this seems to be a pure Apple Python that |
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654 * is unfrozen and presumably has the whole mercurial module in the file |
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655 system |
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656 * presumably is an Apple Python that uses Apple OpenSSL which has patches |
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657 for using system certificate store CAs in addition to the provided |
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|
658 cacerts file |
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659 """ |
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660 if (pycompat.sysplatform != 'darwin' or |
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661 util.mainfrozen() or not pycompat.sysexecutable): |
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662 return False |
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663 exe = os.path.realpath(pycompat.sysexecutable).lower() |
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664 return (exe.startswith('/usr/bin/python') or |
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665 exe.startswith('/system/library/frameworks/python.framework/')) |
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666 |
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|
667 _systemcacertpaths = [ |
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|
668 # RHEL, CentOS, and Fedora |
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669 '/etc/pki/tls/certs/ca-bundle.trust.crt', |
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670 # Debian, Ubuntu, Gentoo |
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671 '/etc/ssl/certs/ca-certificates.crt', |
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672 ] |
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|
673 |
29483
918dce4b8c26
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diff
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|
674 def _defaultcacerts(ui): |
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675 """return path to default CA certificates or None. |
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676 |
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677 It is assumed this function is called when the returned certificates |
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678 file will actually be used to validate connections. Therefore this |
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679 function may print warnings or debug messages assuming this usage. |
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680 |
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681 We don't print a message when the Python is able to load default |
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682 CA certs because this scenario is detected at socket connect time. |
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683 """ |
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684 # The "certifi" Python package provides certificates. If it is installed |
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685 # and usable, assume the user intends it to be used and use it. |
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686 try: |
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687 import certifi |
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688 certs = certifi.where() |
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689 if os.path.exists(certs): |
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690 ui.debug('using ca certificates from certifi\n') |
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691 return certs |
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692 except (ImportError, AttributeError): |
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693 pass |
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694 |
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695 # On Windows, only the modern ssl module is capable of loading the system |
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696 # CA certificates. If we're not capable of doing that, emit a warning |
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697 # because we'll get a certificate verification error later and the lack |
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698 # of loaded CA certificates will be the reason why. |
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699 # Assertion: this code is only called if certificates are being verified. |
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700 if pycompat.osname == 'nt': |
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701 if not _canloaddefaultcerts: |
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702 ui.warn(_('(unable to load Windows CA certificates; see ' |
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703 'https://mercurial-scm.org/wiki/SecureConnections for ' |
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704 'how to configure Mercurial to avoid this message)\n')) |
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705 |
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706 return None |
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|
707 |
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708 # Apple's OpenSSL has patches that allow a specially constructed certificate |
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709 # to load the system CA store. If we're running on Apple Python, use this |
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710 # trick. |
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711 if _plainapplepython(): |
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712 dummycert = os.path.join( |
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713 os.path.dirname(pycompat.fsencode(__file__)), 'dummycert.pem') |
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714 if os.path.exists(dummycert): |
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715 return dummycert |
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716 |
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717 # The Apple OpenSSL trick isn't available to us. If Python isn't able to |
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718 # load system certs, we're out of luck. |
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719 if pycompat.sysplatform == 'darwin': |
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720 # FUTURE Consider looking for Homebrew or MacPorts installed certs |
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721 # files. Also consider exporting the keychain certs to a file during |
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722 # Mercurial install. |
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723 if not _canloaddefaultcerts: |
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724 ui.warn(_('(unable to load CA certificates; see ' |
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725 'https://mercurial-scm.org/wiki/SecureConnections for ' |
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726 'how to configure Mercurial to avoid this message)\n')) |
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727 return None |
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|
728 |
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729 # / is writable on Windows. Out of an abundance of caution make sure |
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730 # we're not on Windows because paths from _systemcacerts could be installed |
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731 # by non-admin users. |
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732 assert pycompat.osname != 'nt' |
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733 |
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734 # Try to find CA certificates in well-known locations. We print a warning |
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735 # when using a found file because we don't want too much silent magic |
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736 # for security settings. The expectation is that proper Mercurial |
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737 # installs will have the CA certs path defined at install time and the |
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738 # installer/packager will make an appropriate decision on the user's |
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739 # behalf. We only get here and perform this setting as a feature of |
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740 # last resort. |
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741 if not _canloaddefaultcerts: |
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742 for path in _systemcacertpaths: |
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743 if os.path.isfile(path): |
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744 ui.warn(_('(using CA certificates from %s; if you see this ' |
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745 'message, your Mercurial install is not properly ' |
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746 'configured; see ' |
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747 'https://mercurial-scm.org/wiki/SecureConnections ' |
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748 'for how to configure Mercurial to avoid this ' |
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749 'message)\n') % path) |
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750 return path |
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751 |
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752 ui.warn(_('(unable to load CA certificates; see ' |
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753 'https://mercurial-scm.org/wiki/SecureConnections for ' |
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|
754 'how to configure Mercurial to avoid this message)\n')) |
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755 |
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756 return None |
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757 |
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758 def validatesocket(sock): |
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759 """Validate a socket meets security requirements. |
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|
760 |
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761 The passed socket must have been created with ``wrapsocket()``. |
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762 """ |
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763 host = sock._hgstate['hostname'] |
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764 ui = sock._hgstate['ui'] |
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|
765 settings = sock._hgstate['settings'] |
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766 |
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767 try: |
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768 peercert = sock.getpeercert(True) |
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769 peercert2 = sock.getpeercert() |
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770 except AttributeError: |
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771 raise error.Abort(_('%s ssl connection error') % host) |
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772 |
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773 if not peercert: |
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774 raise error.Abort(_('%s certificate error: ' |
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|
775 'no certificate received') % host) |
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|
776 |
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|
777 if settings['disablecertverification']: |
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diff
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778 # We don't print the certificate fingerprint because it shouldn't |
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779 # be necessary: if the user requested certificate verification be |
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780 # disabled, they presumably already saw a message about the inability |
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|
781 # to verify the certificate and this message would have printed the |
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782 # fingerprint. So printing the fingerprint here adds little to no |
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783 # value. |
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784 ui.warn(_('warning: connection security to %s is disabled per current ' |
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785 'settings; communication is susceptible to eavesdropping ' |
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786 'and tampering\n') % host) |
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787 return |
18879
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788 |
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789 # If a certificate fingerprint is pinned, use it and only it to |
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790 # validate the remote cert. |
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791 peerfingerprints = { |
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792 'sha1': hashlib.sha1(peercert).hexdigest(), |
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793 'sha256': hashlib.sha256(peercert).hexdigest(), |
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794 'sha512': hashlib.sha512(peercert).hexdigest(), |
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795 } |
18879
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796 |
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797 def fmtfingerprint(s): |
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798 return ':'.join([s[x:x + 2] for x in range(0, len(s), 2)]) |
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799 |
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800 nicefingerprint = 'sha256:%s' % fmtfingerprint(peerfingerprints['sha256']) |
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801 |
29258
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802 if settings['certfingerprints']: |
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803 for hash, fingerprint in settings['certfingerprints']: |
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804 if peerfingerprints[hash].lower() == fingerprint: |
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805 ui.debug('%s certificate matched fingerprint %s:%s\n' % |
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806 (host, hash, fmtfingerprint(fingerprint))) |
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807 if settings['legacyfingerprint']: |
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808 ui.warn(_('(SHA-1 fingerprint for %s found in legacy ' |
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809 '[hostfingerprints] section; ' |
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810 'if you trust this fingerprint, remove the old ' |
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811 'SHA-1 fingerprint from [hostfingerprints] and ' |
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812 'add the following entry to the new ' |
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813 '[hostsecurity] section: %s:fingerprints=%s)\n') % |
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814 (host, host, nicefingerprint)) |
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815 return |
28850
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816 |
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817 # Pinned fingerprint didn't match. This is a fatal error. |
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818 if settings['legacyfingerprint']: |
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819 section = 'hostfingerprint' |
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820 nice = fmtfingerprint(peerfingerprints['sha1']) |
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821 else: |
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822 section = 'hostsecurity' |
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823 nice = '%s:%s' % (hash, fmtfingerprint(peerfingerprints[hash])) |
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824 raise error.Abort(_('certificate for %s has unexpected ' |
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825 'fingerprint %s') % (host, nice), |
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826 hint=_('check %s configuration') % section) |
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827 |
29411
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sslutil: abort when unable to verify peer connection (BC)
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828 # Security is enabled but no CAs are loaded. We can't establish trust |
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829 # for the cert so abort. |
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Gregory Szorc <gregory.szorc@gmail.com>
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830 if not sock._hgstate['caloaded']: |
29411
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831 raise error.Abort( |
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832 _('unable to verify security of %s (no loaded CA certificates); ' |
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833 'refusing to connect') % host, |
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834 hint=_('see https://mercurial-scm.org/wiki/SecureConnections for ' |
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835 'how to configure Mercurial to avoid this error or set ' |
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836 'hostsecurity.%s:fingerprints=%s to trust this server') % |
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837 (host, nicefingerprint)) |
29113
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sslutil: use CA loaded state to drive validation logic
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838 |
29227
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839 msg = _verifycert(peercert2, host) |
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840 if msg: |
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841 raise error.Abort(_('%s certificate error: %s') % (host, msg), |
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842 hint=_('set hostsecurity.%s:certfingerprints=%s ' |
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843 'config setting or use --insecure to connect ' |
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844 'insecurely') % |
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845 (host, nicefingerprint)) |