Mercurial > hg
annotate mercurial/sslutil.py @ 35892:00a56c83ab64
revset: drop deprecated evolution predicates
author | Matt Harbison <matt_harbison@yahoo.com> |
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date | Fri, 02 Feb 2018 23:48:25 -0500 |
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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 node, |
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21 pycompat, |
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22 util, |
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23 ) |
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24 |
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25 # Python 2.7.9+ overhauled the built-in SSL/TLS features of Python. It added |
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26 # support for TLS 1.1, TLS 1.2, SNI, system CA stores, etc. These features are |
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27 # all exposed via the "ssl" module. |
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28 # |
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29 # Depending on the version of Python being used, SSL/TLS support is either |
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30 # modern/secure or legacy/insecure. Many operations in this module have |
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31 # separate code paths depending on support in Python. |
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32 |
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33 configprotocols = { |
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34 'tls1.0', |
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35 'tls1.1', |
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36 'tls1.2', |
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37 } |
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38 |
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39 hassni = getattr(ssl, 'HAS_SNI', False) |
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40 |
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41 # TLS 1.1 and 1.2 may not be supported if the OpenSSL Python is compiled |
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42 # against doesn't support them. |
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43 supportedprotocols = {'tls1.0'} |
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44 if util.safehasattr(ssl, 'PROTOCOL_TLSv1_1'): |
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45 supportedprotocols.add('tls1.1') |
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46 if util.safehasattr(ssl, 'PROTOCOL_TLSv1_2'): |
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47 supportedprotocols.add('tls1.2') |
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48 |
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49 try: |
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50 # ssl.SSLContext was added in 2.7.9 and presence indicates modern |
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51 # SSL/TLS features are available. |
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52 SSLContext = ssl.SSLContext |
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53 modernssl = True |
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54 _canloaddefaultcerts = util.safehasattr(SSLContext, 'load_default_certs') |
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55 except AttributeError: |
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56 modernssl = False |
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57 _canloaddefaultcerts = False |
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58 |
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59 # We implement SSLContext using the interface from the standard library. |
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60 class SSLContext(object): |
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61 def __init__(self, protocol): |
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62 # From the public interface of SSLContext |
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63 self.protocol = protocol |
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64 self.check_hostname = False |
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65 self.options = 0 |
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66 self.verify_mode = ssl.CERT_NONE |
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67 |
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68 # Used by our implementation. |
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69 self._certfile = None |
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70 self._keyfile = None |
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71 self._certpassword = None |
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72 self._cacerts = None |
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73 self._ciphers = None |
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74 |
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75 def load_cert_chain(self, certfile, keyfile=None, password=None): |
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76 self._certfile = certfile |
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77 self._keyfile = keyfile |
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78 self._certpassword = password |
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79 |
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80 def load_default_certs(self, purpose=None): |
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81 pass |
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82 |
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83 def load_verify_locations(self, cafile=None, capath=None, cadata=None): |
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84 if capath: |
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85 raise error.Abort(_('capath not supported')) |
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86 if cadata: |
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87 raise error.Abort(_('cadata not supported')) |
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88 |
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89 self._cacerts = cafile |
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90 |
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91 def set_ciphers(self, ciphers): |
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92 self._ciphers = ciphers |
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93 |
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94 def wrap_socket(self, socket, server_hostname=None, server_side=False): |
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95 # server_hostname is unique to SSLContext.wrap_socket and is used |
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96 # for SNI in that context. So there's nothing for us to do with it |
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97 # in this legacy code since we don't support SNI. |
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98 |
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99 args = { |
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100 r'keyfile': self._keyfile, |
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101 r'certfile': self._certfile, |
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102 r'server_side': server_side, |
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103 r'cert_reqs': self.verify_mode, |
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104 r'ssl_version': self.protocol, |
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105 r'ca_certs': self._cacerts, |
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106 r'ciphers': self._ciphers, |
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107 } |
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108 |
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109 return ssl.wrap_socket(socket, **args) |
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110 |
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111 def _hostsettings(ui, hostname): |
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112 """Obtain security settings for a hostname. |
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113 |
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114 Returns a dict of settings relevant to that hostname. |
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115 """ |
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116 s = { |
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117 # Whether we should attempt to load default/available CA certs |
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118 # if an explicit ``cafile`` is not defined. |
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119 'allowloaddefaultcerts': True, |
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120 # List of 2-tuple of (hash algorithm, hash). |
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121 'certfingerprints': [], |
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122 # Path to file containing concatenated CA certs. Used by |
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123 # SSLContext.load_verify_locations(). |
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124 'cafile': None, |
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125 # Whether certificate verification should be disabled. |
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126 'disablecertverification': False, |
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127 # Whether the legacy [hostfingerprints] section has data for this host. |
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128 'legacyfingerprint': False, |
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129 # PROTOCOL_* constant to use for SSLContext.__init__. |
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130 'protocol': None, |
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131 # String representation of minimum protocol to be used for UI |
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132 # presentation. |
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133 'protocolui': None, |
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134 # ssl.CERT_* constant used by SSLContext.verify_mode. |
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135 'verifymode': None, |
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136 # Defines extra ssl.OP* bitwise options to set. |
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137 'ctxoptions': None, |
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138 # OpenSSL Cipher List to use (instead of default). |
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139 'ciphers': None, |
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140 } |
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141 |
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142 # Allow minimum TLS protocol to be specified in the config. |
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143 def validateprotocol(protocol, key): |
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144 if protocol not in configprotocols: |
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145 raise error.Abort( |
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146 _('unsupported protocol from hostsecurity.%s: %s') % |
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147 (key, protocol), |
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148 hint=_('valid protocols: %s') % |
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149 ' '.join(sorted(configprotocols))) |
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150 |
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151 # We default to TLS 1.1+ where we can because TLS 1.0 has known |
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152 # vulnerabilities (like BEAST and POODLE). We allow users to downgrade to |
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153 # TLS 1.0+ via config options in case a legacy server is encountered. |
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154 if 'tls1.1' in supportedprotocols: |
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155 defaultprotocol = 'tls1.1' |
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156 else: |
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157 # Let people know they are borderline secure. |
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158 # We don't document this config option because we want people to see |
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159 # the bold warnings on the web site. |
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160 # internal config: hostsecurity.disabletls10warning |
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161 if not ui.configbool('hostsecurity', 'disabletls10warning'): |
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162 ui.warn(_('warning: connecting to %s using legacy security ' |
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163 'technology (TLS 1.0); see ' |
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164 'https://mercurial-scm.org/wiki/SecureConnections for ' |
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165 'more info\n') % hostname) |
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166 defaultprotocol = 'tls1.0' |
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167 |
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168 key = 'minimumprotocol' |
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169 protocol = ui.config('hostsecurity', key, defaultprotocol) |
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170 validateprotocol(protocol, key) |
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171 |
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172 key = '%s:minimumprotocol' % hostname |
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173 protocol = ui.config('hostsecurity', key, protocol) |
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174 validateprotocol(protocol, key) |
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175 |
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176 # If --insecure is used, we allow the use of TLS 1.0 despite config options. |
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177 # We always print a "connection security to %s is disabled..." message when |
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178 # --insecure is used. So no need to print anything more here. |
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179 if ui.insecureconnections: |
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180 protocol = 'tls1.0' |
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181 |
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182 s['protocol'], s['ctxoptions'], s['protocolui'] = protocolsettings(protocol) |
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183 |
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184 ciphers = ui.config('hostsecurity', 'ciphers') |
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185 ciphers = ui.config('hostsecurity', '%s:ciphers' % hostname, ciphers) |
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186 s['ciphers'] = ciphers |
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187 |
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188 # Look for fingerprints in [hostsecurity] section. Value is a list |
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189 # of <alg>:<fingerprint> strings. |
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190 fingerprints = ui.configlist('hostsecurity', '%s:fingerprints' % hostname) |
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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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343 if not serverhostname: |
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344 raise error.Abort(_('serverhostname argument is required')) |
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345 |
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346 for f in (keyfile, certfile): |
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347 if f and not os.path.exists(f): |
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348 raise error.Abort(_('certificate file (%s) does not exist; ' |
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349 'cannot connect to %s') % (f, serverhostname), |
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350 hint=_('restore missing file or fix references ' |
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351 'in Mercurial config')) |
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352 |
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353 settings = _hostsettings(ui, serverhostname) |
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354 |
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355 # We can't use ssl.create_default_context() because it calls |
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356 # load_default_certs() unless CA arguments are passed to it. We want to |
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357 # have explicit control over CA loading because implicitly loading |
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358 # CAs may undermine the user's intent. For example, a user may define a CA |
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359 # bundle with a specific CA cert removed. If the system/default CA bundle |
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360 # is loaded and contains that removed CA, you've just undone the user's |
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361 # choice. |
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362 sslcontext = SSLContext(settings['protocol']) |
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363 |
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364 # This is a no-op unless using modern ssl. |
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365 sslcontext.options |= settings['ctxoptions'] |
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366 |
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367 # This still works on our fake SSLContext. |
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368 sslcontext.verify_mode = settings['verifymode'] |
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369 |
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370 if settings['ciphers']: |
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371 try: |
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372 sslcontext.set_ciphers(settings['ciphers']) |
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373 except ssl.SSLError as e: |
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374 raise error.Abort(_('could not set ciphers: %s') % e.args[0], |
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375 hint=_('change cipher string (%s) in config') % |
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376 settings['ciphers']) |
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377 |
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378 if certfile is not None: |
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379 def password(): |
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380 f = keyfile or certfile |
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381 return ui.getpass(_('passphrase for %s: ') % f, '') |
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382 sslcontext.load_cert_chain(certfile, keyfile, password) |
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383 |
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384 if settings['cafile'] is not None: |
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385 try: |
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386 sslcontext.load_verify_locations(cafile=settings['cafile']) |
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387 except ssl.SSLError as e: |
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388 if len(e.args) == 1: # pypy has different SSLError args |
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389 msg = e.args[0] |
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390 else: |
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391 msg = e.args[1] |
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392 raise error.Abort(_('error loading CA file %s: %s') % ( |
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393 settings['cafile'], msg), |
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394 hint=_('file is empty or malformed?')) |
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395 caloaded = True |
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396 elif settings['allowloaddefaultcerts']: |
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397 # This is a no-op on old Python. |
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398 sslcontext.load_default_certs() |
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399 caloaded = True |
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400 else: |
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401 caloaded = False |
23834
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https: support tls sni (server name indication) for https urls (issue3090)
Alex Orange <crazycasta@gmail.com>
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402 |
29449
5b71a8d7f7ff
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403 try: |
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404 sslsocket = sslcontext.wrap_socket(sock, server_hostname=serverhostname) |
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405 except ssl.SSLError as e: |
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406 # If we're doing certificate verification and no CA certs are loaded, |
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407 # that is almost certainly the reason why verification failed. Provide |
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408 # a hint to the user. |
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409 # Only modern ssl module exposes SSLContext.get_ca_certs() so we can |
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410 # only show this warning if modern ssl is available. |
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411 # The exception handler is here to handle bugs around cert attributes: |
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412 # https://bugs.python.org/issue20916#msg213479. (See issues5313.) |
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413 # When the main 20916 bug occurs, 'sslcontext.get_ca_certs()' is a |
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414 # non-empty list, but the following conditional is otherwise True. |
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415 try: |
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416 if (caloaded and settings['verifymode'] == ssl.CERT_REQUIRED and |
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417 modernssl and not sslcontext.get_ca_certs()): |
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418 ui.warn(_('(an attempt was made to load CA certificates but ' |
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419 'none were loaded; see ' |
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420 'https://mercurial-scm.org/wiki/SecureConnections ' |
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421 'for how to configure Mercurial to avoid this ' |
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422 'error)\n')) |
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423 except ssl.SSLError: |
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424 pass |
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425 # Try to print more helpful error messages for known failures. |
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426 if util.safehasattr(e, 'reason'): |
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427 # This error occurs when the client and server don't share a |
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428 # common/supported SSL/TLS protocol. We've disabled SSLv2 and SSLv3 |
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429 # outright. Hopefully the reason for this error is that we require |
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430 # TLS 1.1+ and the server only supports TLS 1.0. Whatever the |
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431 # reason, try to emit an actionable warning. |
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432 if e.reason == 'UNSUPPORTED_PROTOCOL': |
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433 # We attempted TLS 1.0+. |
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434 if settings['protocolui'] == 'tls1.0': |
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435 # We support more than just TLS 1.0+. If this happens, |
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436 # the likely scenario is either the client or the server |
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437 # is really old. (e.g. server doesn't support TLS 1.0+ or |
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438 # client doesn't support modern TLS versions introduced |
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439 # several years from when this comment was written). |
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440 if supportedprotocols != {'tls1.0'}: |
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441 ui.warn(_( |
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442 '(could not communicate with %s using security ' |
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443 'protocols %s; if you are using a modern Mercurial ' |
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444 'version, consider contacting the operator of this ' |
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445 'server; see ' |
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446 'https://mercurial-scm.org/wiki/SecureConnections ' |
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447 'for more info)\n') % ( |
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448 serverhostname, |
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449 ', '.join(sorted(supportedprotocols)))) |
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450 else: |
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451 ui.warn(_( |
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452 '(could not communicate with %s using TLS 1.0; the ' |
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453 'likely cause of this is the server no longer ' |
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454 'supports TLS 1.0 because it has known security ' |
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455 'vulnerabilities; see ' |
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456 'https://mercurial-scm.org/wiki/SecureConnections ' |
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457 'for more info)\n') % serverhostname) |
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458 else: |
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459 # We attempted TLS 1.1+. We can only get here if the client |
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460 # supports the configured protocol. So the likely reason is |
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461 # the client wants better security than the server can |
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462 # offer. |
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463 ui.warn(_( |
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464 '(could not negotiate a common security protocol (%s+) ' |
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465 'with %s; the likely cause is Mercurial is configured ' |
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466 'to be more secure than the server can support)\n') % ( |
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467 settings['protocolui'], serverhostname)) |
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468 ui.warn(_('(consider contacting the operator of this ' |
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469 'server and ask them to support modern TLS ' |
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470 'protocol versions; or, set ' |
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471 'hostsecurity.%s:minimumprotocol=tls1.0 to allow ' |
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472 'use of legacy, less secure protocols when ' |
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473 'communicating with this server)\n') % |
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474 serverhostname) |
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475 ui.warn(_( |
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476 '(see https://mercurial-scm.org/wiki/SecureConnections ' |
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477 'for more info)\n')) |
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478 |
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479 elif (e.reason == 'CERTIFICATE_VERIFY_FAILED' and |
34645 | 480 pycompat.iswindows): |
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481 |
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482 ui.warn(_('(the full certificate chain may not be available ' |
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483 'locally; see "hg help debugssl")\n')) |
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484 raise |
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485 |
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486 # check if wrap_socket failed silently because socket had been |
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487 # closed |
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488 # - see http://bugs.python.org/issue13721 |
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489 if not sslsocket.cipher(): |
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490 raise error.Abort(_('ssl connection failed')) |
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491 |
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492 sslsocket._hgstate = { |
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493 'caloaded': caloaded, |
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494 'hostname': serverhostname, |
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495 'settings': settings, |
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496 'ui': ui, |
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497 } |
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498 |
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499 return sslsocket |
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500 |
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501 def wrapserversocket(sock, ui, certfile=None, keyfile=None, cafile=None, |
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502 requireclientcert=False): |
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503 """Wrap a socket for use by servers. |
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504 |
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505 ``certfile`` and ``keyfile`` specify the files containing the certificate's |
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506 public and private keys, respectively. Both keys can be defined in the same |
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507 file via ``certfile`` (the private key must come first in the file). |
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508 |
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509 ``cafile`` defines the path to certificate authorities. |
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510 |
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511 ``requireclientcert`` specifies whether to require client certificates. |
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512 |
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513 Typically ``cafile`` is only defined if ``requireclientcert`` is true. |
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514 """ |
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515 # This function is not used much by core Mercurial, so the error messaging |
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516 # doesn't have to be as detailed as for wrapsocket(). |
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517 for f in (certfile, keyfile, cafile): |
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518 if f and not os.path.exists(f): |
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519 raise error.Abort(_('referenced certificate file (%s) does not ' |
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520 'exist') % f) |
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521 |
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522 protocol, options, _protocolui = protocolsettings('tls1.0') |
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523 |
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524 # This config option is intended for use in tests only. It is a giant |
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525 # footgun to kill security. Don't define it. |
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526 exactprotocol = ui.config('devel', 'serverexactprotocol') |
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527 if exactprotocol == 'tls1.0': |
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528 protocol = ssl.PROTOCOL_TLSv1 |
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529 elif exactprotocol == 'tls1.1': |
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530 if 'tls1.1' not in supportedprotocols: |
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531 raise error.Abort(_('TLS 1.1 not supported by this Python')) |
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532 protocol = ssl.PROTOCOL_TLSv1_1 |
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533 elif exactprotocol == 'tls1.2': |
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534 if 'tls1.2' not in supportedprotocols: |
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535 raise error.Abort(_('TLS 1.2 not supported by this Python')) |
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536 protocol = ssl.PROTOCOL_TLSv1_2 |
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537 elif exactprotocol: |
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538 raise error.Abort(_('invalid value for serverexactprotocol: %s') % |
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539 exactprotocol) |
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540 |
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541 if modernssl: |
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542 # We /could/ use create_default_context() here since it doesn't load |
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543 # CAs when configured for client auth. However, it is hard-coded to |
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544 # use ssl.PROTOCOL_SSLv23 which may not be appropriate here. |
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545 sslcontext = SSLContext(protocol) |
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546 sslcontext.options |= options |
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547 |
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548 # Improve forward secrecy. |
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549 sslcontext.options |= getattr(ssl, 'OP_SINGLE_DH_USE', 0) |
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550 sslcontext.options |= getattr(ssl, 'OP_SINGLE_ECDH_USE', 0) |
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551 |
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552 # Use the list of more secure ciphers if found in the ssl module. |
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553 if util.safehasattr(ssl, '_RESTRICTED_SERVER_CIPHERS'): |
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554 sslcontext.options |= getattr(ssl, 'OP_CIPHER_SERVER_PREFERENCE', 0) |
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|
555 sslcontext.set_ciphers(ssl._RESTRICTED_SERVER_CIPHERS) |
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556 else: |
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557 sslcontext = SSLContext(ssl.PROTOCOL_TLSv1) |
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558 |
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559 if requireclientcert: |
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560 sslcontext.verify_mode = ssl.CERT_REQUIRED |
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561 else: |
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562 sslcontext.verify_mode = ssl.CERT_NONE |
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563 |
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564 if certfile or keyfile: |
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565 sslcontext.load_cert_chain(certfile=certfile, keyfile=keyfile) |
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566 |
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567 if cafile: |
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568 sslcontext.load_verify_locations(cafile=cafile) |
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569 |
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|
570 return sslcontext.wrap_socket(sock, server_side=True) |
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571 |
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572 class wildcarderror(Exception): |
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573 """Represents an error parsing wildcards in DNS name.""" |
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574 |
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575 def _dnsnamematch(dn, hostname, maxwildcards=1): |
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576 """Match DNS names according RFC 6125 section 6.4.3. |
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577 |
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578 This code is effectively copied from CPython's ssl._dnsname_match. |
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579 |
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580 Returns a bool indicating whether the expected hostname matches |
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581 the value in ``dn``. |
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582 """ |
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583 pats = [] |
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584 if not dn: |
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585 return False |
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586 |
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587 pieces = dn.split(r'.') |
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588 leftmost = pieces[0] |
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589 remainder = pieces[1:] |
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590 wildcards = leftmost.count('*') |
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591 if wildcards > maxwildcards: |
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592 raise wildcarderror( |
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593 _('too many wildcards in certificate DNS name: %s') % dn) |
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594 |
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595 # speed up common case w/o wildcards |
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596 if not wildcards: |
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597 return dn.lower() == hostname.lower() |
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diff
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598 |
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599 # RFC 6125, section 6.4.3, subitem 1. |
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600 # The client SHOULD NOT attempt to match a presented identifier in which |
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|
601 # the wildcard character comprises a label other than the left-most label. |
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602 if leftmost == '*': |
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603 # When '*' is a fragment by itself, it matches a non-empty dotless |
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604 # fragment. |
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605 pats.append('[^.]+') |
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|
606 elif leftmost.startswith('xn--') or hostname.startswith('xn--'): |
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607 # RFC 6125, section 6.4.3, subitem 3. |
26a5d605b868
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|
608 # The client SHOULD NOT attempt to match a presented identifier |
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diff
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609 # where the wildcard character is embedded within an A-label or |
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610 # U-label of an internationalized domain name. |
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611 pats.append(re.escape(leftmost)) |
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612 else: |
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613 # Otherwise, '*' matches any dotless string, e.g. www* |
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614 pats.append(re.escape(leftmost).replace(r'\*', '[^.]*')) |
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615 |
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616 # add the remaining fragments, ignore any wildcards |
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617 for frag in remainder: |
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618 pats.append(re.escape(frag)) |
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619 |
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620 pat = re.compile(r'\A' + r'\.'.join(pats) + r'\Z', re.IGNORECASE) |
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621 return pat.match(hostname) is not None |
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622 |
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623 def _verifycert(cert, hostname): |
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624 '''Verify that cert (in socket.getpeercert() format) matches hostname. |
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625 CRLs is not handled. |
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626 |
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|
627 Returns error message if any problems are found and None on success. |
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628 ''' |
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|
629 if not cert: |
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|
630 return _('no certificate received') |
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|
631 |
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632 dnsnames = [] |
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633 san = cert.get('subjectAltName', []) |
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634 for key, value in san: |
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635 if key == 'DNS': |
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636 try: |
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637 if _dnsnamematch(value, hostname): |
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638 return |
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639 except wildcarderror as e: |
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640 return e.args[0] |
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641 |
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642 dnsnames.append(value) |
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643 |
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644 if not dnsnames: |
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645 # The subject is only checked when there is no DNS in subjectAltName. |
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646 for sub in cert.get('subject', []): |
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647 for key, value in sub: |
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648 # According to RFC 2818 the most specific Common Name must |
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649 # be used. |
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650 if key == 'commonName': |
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651 # 'subject' entries are unicode. |
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652 try: |
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653 value = value.encode('ascii') |
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654 except UnicodeEncodeError: |
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655 return _('IDN in certificate not supported') |
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656 |
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|
657 try: |
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658 if _dnsnamematch(value, hostname): |
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659 return |
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660 except wildcarderror as e: |
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661 return e.args[0] |
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662 |
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663 dnsnames.append(value) |
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664 |
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665 if len(dnsnames) > 1: |
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666 return _('certificate is for %s') % ', '.join(dnsnames) |
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667 elif len(dnsnames) == 1: |
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668 return _('certificate is for %s') % dnsnames[0] |
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669 else: |
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670 return _('no commonName or subjectAltName found in certificate') |
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671 |
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672 def _plainapplepython(): |
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673 """return true if this seems to be a pure Apple Python that |
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674 * is unfrozen and presumably has the whole mercurial module in the file |
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675 system |
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676 * presumably is an Apple Python that uses Apple OpenSSL which has patches |
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677 for using system certificate store CAs in addition to the provided |
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678 cacerts file |
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679 """ |
34647 | 680 if (not pycompat.isdarwin or util.mainfrozen() or |
681 not pycompat.sysexecutable): | |
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682 return False |
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683 exe = os.path.realpath(pycompat.sysexecutable).lower() |
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684 return (exe.startswith('/usr/bin/python') or |
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685 exe.startswith('/system/library/frameworks/python.framework/')) |
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686 |
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687 _systemcacertpaths = [ |
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688 # RHEL, CentOS, and Fedora |
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689 '/etc/pki/tls/certs/ca-bundle.trust.crt', |
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690 # Debian, Ubuntu, Gentoo |
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691 '/etc/ssl/certs/ca-certificates.crt', |
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692 ] |
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693 |
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694 def _defaultcacerts(ui): |
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695 """return path to default CA certificates or None. |
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696 |
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697 It is assumed this function is called when the returned certificates |
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698 file will actually be used to validate connections. Therefore this |
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699 function may print warnings or debug messages assuming this usage. |
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700 |
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701 We don't print a message when the Python is able to load default |
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702 CA certs because this scenario is detected at socket connect time. |
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703 """ |
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704 # The "certifi" Python package provides certificates. If it is installed |
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705 # and usable, assume the user intends it to be used and use it. |
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706 try: |
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707 import certifi |
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708 certs = certifi.where() |
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709 if os.path.exists(certs): |
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710 ui.debug('using ca certificates from certifi\n') |
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711 return certs |
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712 except (ImportError, AttributeError): |
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713 pass |
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714 |
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715 # On Windows, only the modern ssl module is capable of loading the system |
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716 # CA certificates. If we're not capable of doing that, emit a warning |
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717 # because we'll get a certificate verification error later and the lack |
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718 # of loaded CA certificates will be the reason why. |
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719 # Assertion: this code is only called if certificates are being verified. |
34645 | 720 if pycompat.iswindows: |
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721 if not _canloaddefaultcerts: |
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722 ui.warn(_('(unable to load Windows CA certificates; see ' |
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723 'https://mercurial-scm.org/wiki/SecureConnections for ' |
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724 'how to configure Mercurial to avoid this message)\n')) |
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725 |
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726 return None |
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727 |
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728 # Apple's OpenSSL has patches that allow a specially constructed certificate |
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729 # to load the system CA store. If we're running on Apple Python, use this |
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730 # trick. |
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731 if _plainapplepython(): |
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732 dummycert = os.path.join( |
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733 os.path.dirname(pycompat.fsencode(__file__)), 'dummycert.pem') |
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734 if os.path.exists(dummycert): |
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735 return dummycert |
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736 |
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737 # The Apple OpenSSL trick isn't available to us. If Python isn't able to |
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738 # load system certs, we're out of luck. |
34647 | 739 if pycompat.isdarwin: |
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740 # FUTURE Consider looking for Homebrew or MacPorts installed certs |
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741 # files. Also consider exporting the keychain certs to a file during |
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742 # Mercurial install. |
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743 if not _canloaddefaultcerts: |
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744 ui.warn(_('(unable to load CA certificates; see ' |
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745 'https://mercurial-scm.org/wiki/SecureConnections for ' |
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746 'how to configure Mercurial to avoid this message)\n')) |
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747 return None |
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748 |
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749 # / is writable on Windows. Out of an abundance of caution make sure |
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750 # we're not on Windows because paths from _systemcacerts could be installed |
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751 # by non-admin users. |
34645 | 752 assert not pycompat.iswindows |
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753 |
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754 # Try to find CA certificates in well-known locations. We print a warning |
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755 # when using a found file because we don't want too much silent magic |
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756 # for security settings. The expectation is that proper Mercurial |
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757 # installs will have the CA certs path defined at install time and the |
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758 # installer/packager will make an appropriate decision on the user's |
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759 # behalf. We only get here and perform this setting as a feature of |
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760 # last resort. |
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761 if not _canloaddefaultcerts: |
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762 for path in _systemcacertpaths: |
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763 if os.path.isfile(path): |
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764 ui.warn(_('(using CA certificates from %s; if you see this ' |
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765 'message, your Mercurial install is not properly ' |
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766 'configured; see ' |
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767 'https://mercurial-scm.org/wiki/SecureConnections ' |
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768 'for how to configure Mercurial to avoid this ' |
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769 'message)\n') % path) |
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770 return path |
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|
771 |
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772 ui.warn(_('(unable to load CA certificates; see ' |
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773 'https://mercurial-scm.org/wiki/SecureConnections for ' |
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774 'how to configure Mercurial to avoid this message)\n')) |
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775 |
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776 return None |
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777 |
29286
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29268
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778 def validatesocket(sock): |
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779 """Validate a socket meets security requirements. |
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780 |
29227
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|
781 The passed socket must have been created with ``wrapsocket()``. |
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782 """ |
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|
783 host = sock._hgstate['hostname'] |
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|
784 ui = sock._hgstate['ui'] |
29258
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29253
diff
changeset
|
785 settings = sock._hgstate['settings'] |
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786 |
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787 try: |
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788 peercert = sock.getpeercert(True) |
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789 peercert2 = sock.getpeercert() |
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790 except AttributeError: |
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791 raise error.Abort(_('%s ssl connection error') % host) |
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792 |
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793 if not peercert: |
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794 raise error.Abort(_('%s certificate error: ' |
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795 'no certificate received') % host) |
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796 |
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797 if settings['disablecertverification']: |
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798 # We don't print the certificate fingerprint because it shouldn't |
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799 # be necessary: if the user requested certificate verification be |
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800 # disabled, they presumably already saw a message about the inability |
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801 # to verify the certificate and this message would have printed the |
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802 # fingerprint. So printing the fingerprint here adds little to no |
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803 # value. |
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804 ui.warn(_('warning: connection security to %s is disabled per current ' |
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805 'settings; communication is susceptible to eavesdropping ' |
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806 'and tampering\n') % host) |
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807 return |
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808 |
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809 # If a certificate fingerprint is pinned, use it and only it to |
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810 # validate the remote cert. |
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811 peerfingerprints = { |
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812 'sha1': node.hex(hashlib.sha1(peercert).digest()), |
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813 'sha256': node.hex(hashlib.sha256(peercert).digest()), |
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814 'sha512': node.hex(hashlib.sha512(peercert).digest()), |
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815 } |
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816 |
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817 def fmtfingerprint(s): |
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818 return ':'.join([s[x:x + 2] for x in range(0, len(s), 2)]) |
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819 |
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820 nicefingerprint = 'sha256:%s' % fmtfingerprint(peerfingerprints['sha256']) |
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821 |
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822 if settings['certfingerprints']: |
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823 for hash, fingerprint in settings['certfingerprints']: |
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824 if peerfingerprints[hash].lower() == fingerprint: |
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825 ui.debug('%s certificate matched fingerprint %s:%s\n' % |
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826 (host, hash, fmtfingerprint(fingerprint))) |
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827 if settings['legacyfingerprint']: |
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828 ui.warn(_('(SHA-1 fingerprint for %s found in legacy ' |
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829 '[hostfingerprints] section; ' |
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830 'if you trust this fingerprint, remove the old ' |
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831 'SHA-1 fingerprint from [hostfingerprints] and ' |
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832 'add the following entry to the new ' |
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833 '[hostsecurity] section: %s:fingerprints=%s)\n') % |
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834 (host, host, nicefingerprint)) |
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835 return |
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836 |
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837 # Pinned fingerprint didn't match. This is a fatal error. |
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838 if settings['legacyfingerprint']: |
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839 section = 'hostfingerprint' |
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840 nice = fmtfingerprint(peerfingerprints['sha1']) |
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841 else: |
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842 section = 'hostsecurity' |
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843 nice = '%s:%s' % (hash, fmtfingerprint(peerfingerprints[hash])) |
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844 raise error.Abort(_('certificate for %s has unexpected ' |
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845 'fingerprint %s') % (host, nice), |
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846 hint=_('check %s configuration') % section) |
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847 |
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848 # Security is enabled but no CAs are loaded. We can't establish trust |
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849 # for the cert so abort. |
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|
850 if not sock._hgstate['caloaded']: |
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|
851 raise error.Abort( |
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|
852 _('unable to verify security of %s (no loaded CA certificates); ' |
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853 'refusing to connect') % host, |
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854 hint=_('see https://mercurial-scm.org/wiki/SecureConnections for ' |
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|
855 'how to configure Mercurial to avoid this error or set ' |
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|
856 'hostsecurity.%s:fingerprints=%s to trust this server') % |
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|
857 (host, nicefingerprint)) |
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sslutil: use CA loaded state to drive validation logic
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|
858 |
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859 msg = _verifycert(peercert2, host) |
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860 if msg: |
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861 raise error.Abort(_('%s certificate error: %s') % (host, msg), |
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862 hint=_('set hostsecurity.%s:certfingerprints=%s ' |
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863 'config setting or use --insecure to connect ' |
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864 'insecurely') % |
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|
865 (host, nicefingerprint)) |