annotate mercurial/sslutil.py @ 27688:6c7d26cef0cd stable

sslutil: fix reversed logic (issue5034)
author Gábor Stefanik <gabor.stefanik@nng.com>
date Fri, 08 Jan 2016 16:27:25 +0100
parents 9e15286609ae
children dfb21c34e07d
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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 os
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13 import ssl
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14 import sys
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15
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16 from .i18n import _
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17 from . import error, util
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18
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19 hassni = getattr(ssl, 'HAS_SNI', False)
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20
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21 _canloaddefaultcerts = False
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22 try:
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23 ssl_context = ssl.SSLContext
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24 _canloaddefaultcerts = util.safehasattr(ssl_context, 'load_default_certs')
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25
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26 def wrapsocket(sock, keyfile, certfile, ui, cert_reqs=ssl.CERT_NONE,
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27 ca_certs=None, serverhostname=None):
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28 # Allow any version of SSL starting with TLSv1 and
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29 # up. Note that specifying TLSv1 here prohibits use of
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30 # newer standards (like TLSv1_2), so this is the right way
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31 # to do this. Note that in the future it'd be better to
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32 # support using ssl.create_default_context(), which sets
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33 # up a bunch of things in smart ways (strong ciphers,
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34 # protocol versions, etc) and is upgraded by Python
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35 # maintainers for us, but that breaks too many things to
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36 # do it in a hurry.
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37 sslcontext = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
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38 sslcontext.options |= ssl.OP_NO_SSLv2 | ssl.OP_NO_SSLv3
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39 if certfile is not None:
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40 def password():
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41 f = keyfile or certfile
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42 return ui.getpass(_('passphrase for %s: ') % f, '')
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43 sslcontext.load_cert_chain(certfile, keyfile, password)
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44 sslcontext.verify_mode = cert_reqs
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45 if ca_certs is not None:
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46 sslcontext.load_verify_locations(cafile=ca_certs)
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47 elif _canloaddefaultcerts:
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48 sslcontext.load_default_certs()
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49
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50 sslsocket = sslcontext.wrap_socket(sock, server_hostname=serverhostname)
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51 # check if wrap_socket failed silently because socket had been
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52 # closed
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53 # - see http://bugs.python.org/issue13721
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54 if not sslsocket.cipher():
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55 raise error.Abort(_('ssl connection failed'))
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56 return sslsocket
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57 except AttributeError:
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58 def wrapsocket(sock, keyfile, certfile, ui, cert_reqs=ssl.CERT_NONE,
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59 ca_certs=None, serverhostname=None):
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60 sslsocket = ssl.wrap_socket(sock, keyfile, certfile,
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61 cert_reqs=cert_reqs, ca_certs=ca_certs,
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62 ssl_version=ssl.PROTOCOL_TLSv1)
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63 # check if wrap_socket failed silently because socket had been
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64 # closed
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65 # - see http://bugs.python.org/issue13721
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66 if not sslsocket.cipher():
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67 raise error.Abort(_('ssl connection failed'))
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68 return sslsocket
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69
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70 def _verifycert(cert, hostname):
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71 '''Verify that cert (in socket.getpeercert() format) matches hostname.
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72 CRLs is not handled.
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73
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74 Returns error message if any problems are found and None on success.
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75 '''
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76 if not cert:
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77 return _('no certificate received')
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78 dnsname = hostname.lower()
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79 def matchdnsname(certname):
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80 return (certname == dnsname or
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81 '.' in dnsname and certname == '*.' + dnsname.split('.', 1)[1])
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82
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83 san = cert.get('subjectAltName', [])
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84 if san:
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85 certnames = [value.lower() for key, value in san if key == 'DNS']
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86 for name in certnames:
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87 if matchdnsname(name):
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88 return None
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89 if certnames:
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90 return _('certificate is for %s') % ', '.join(certnames)
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91
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92 # subject is only checked when subjectAltName is empty
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93 for s in cert.get('subject', []):
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94 key, value = s[0]
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95 if key == 'commonName':
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96 try:
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97 # 'subject' entries are unicode
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98 certname = value.lower().encode('ascii')
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99 except UnicodeEncodeError:
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100 return _('IDN in certificate not supported')
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101 if matchdnsname(certname):
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102 return None
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103 return _('certificate is for %s') % certname
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104 return _('no commonName or subjectAltName found in certificate')
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105
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106
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107 # CERT_REQUIRED means fetch the cert from the server all the time AND
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108 # validate it against the CA store provided in web.cacerts.
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109
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110 def _plainapplepython():
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111 """return true if this seems to be a pure Apple Python that
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112 * is unfrozen and presumably has the whole mercurial module in the file
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113 system
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114 * presumably is an Apple Python that uses Apple OpenSSL which has patches
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115 for using system certificate store CAs in addition to the provided
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116 cacerts file
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117 """
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118 if sys.platform != 'darwin' or util.mainfrozen() or not sys.executable:
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119 return False
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120 exe = os.path.realpath(sys.executable).lower()
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121 return (exe.startswith('/usr/bin/python') or
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122 exe.startswith('/system/library/frameworks/python.framework/'))
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123
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124 def _defaultcacerts():
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125 """return path to CA certificates; None for system's store; ! to disable"""
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126 if _plainapplepython():
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127 dummycert = os.path.join(os.path.dirname(__file__), 'dummycert.pem')
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128 if os.path.exists(dummycert):
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129 return dummycert
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130 if _canloaddefaultcerts:
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131 return None
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132 return '!'
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133
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134 def sslkwargs(ui, host):
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135 kws = {'ui': ui}
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136 hostfingerprint = ui.config('hostfingerprints', host)
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137 if hostfingerprint:
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138 return kws
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139 cacerts = ui.config('web', 'cacerts')
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140 if cacerts == '!':
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141 pass
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142 elif cacerts:
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143 cacerts = util.expandpath(cacerts)
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144 if not os.path.exists(cacerts):
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145 raise error.Abort(_('could not find web.cacerts: %s') % cacerts)
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146 else:
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147 cacerts = _defaultcacerts()
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148 if cacerts and cacerts != '!':
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149 ui.debug('using %s to enable OS X system CA\n' % cacerts)
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150 ui.setconfig('web', 'cacerts', cacerts, 'defaultcacerts')
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151 if cacerts != '!':
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152 kws.update({'ca_certs': cacerts,
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153 'cert_reqs': ssl.CERT_REQUIRED,
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154 })
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diff changeset
155 return kws
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156
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157 class validator(object):
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158 def __init__(self, ui, host):
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159 self.ui = ui
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160 self.host = host
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161
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162 def __call__(self, sock, strict=False):
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163 host = self.host
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164 cacerts = self.ui.config('web', 'cacerts')
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165 hostfingerprint = self.ui.config('hostfingerprints', host)
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diff changeset
166
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diff changeset
167 if not sock.cipher(): # work around http://bugs.python.org/issue13721
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168 raise error.Abort(_('%s ssl connection error') % host)
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diff changeset
169 try:
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170 peercert = sock.getpeercert(True)
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171 peercert2 = sock.getpeercert()
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diff changeset
172 except AttributeError:
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173 raise error.Abort(_('%s ssl connection error') % host)
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diff changeset
174
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diff changeset
175 if not peercert:
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176 raise error.Abort(_('%s certificate error: '
15817
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diff changeset
177 'no certificate received') % host)
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diff changeset
178 peerfingerprint = util.sha1(peercert).hexdigest()
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diff changeset
179 nicefingerprint = ":".join([peerfingerprint[x:x + 2]
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diff changeset
180 for x in xrange(0, len(peerfingerprint), 2)])
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diff changeset
181 if hostfingerprint:
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diff changeset
182 if peerfingerprint.lower() != \
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diff changeset
183 hostfingerprint.replace(':', '').lower():
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184 raise error.Abort(_('certificate for %s has unexpected '
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diff changeset
185 'fingerprint %s') % (host, nicefingerprint),
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diff changeset
186 hint=_('check hostfingerprint configuration'))
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diff changeset
187 self.ui.debug('%s certificate matched fingerprint %s\n' %
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diff changeset
188 (host, nicefingerprint))
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diff changeset
189 elif cacerts != '!':
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diff changeset
190 msg = _verifycert(peercert2, host)
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191 if msg:
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diff changeset
192 raise error.Abort(_('%s certificate error: %s') % (host, msg),
15814
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diff changeset
193 hint=_('configure hostfingerprint %s or use '
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diff changeset
194 '--insecure to connect insecurely') %
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diff changeset
195 nicefingerprint)
14204
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196 self.ui.debug('%s certificate successfully verified\n' % host)
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parents: 18879
diff changeset
197 elif strict:
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parents: 25977
diff changeset
198 raise error.Abort(_('%s certificate with fingerprint %s not '
18887
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parents: 18879
diff changeset
199 'verified') % (host, nicefingerprint),
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parents: 18879
diff changeset
200 hint=_('check hostfingerprints or web.cacerts '
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FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
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diff changeset
201 'config setting'))
14204
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diff changeset
202 else:
15815
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diff changeset
203 self.ui.warn(_('warning: %s certificate with fingerprint %s not '
edc3a901a63d sslutil: reorder validator code to make it more readable
Mads Kiilerich <mads@kiilerich.com>
parents: 15814
diff changeset
204 'verified (check hostfingerprints or web.cacerts '
edc3a901a63d sslutil: reorder validator code to make it more readable
Mads Kiilerich <mads@kiilerich.com>
parents: 15814
diff changeset
205 'config setting)\n') %
edc3a901a63d sslutil: reorder validator code to make it more readable
Mads Kiilerich <mads@kiilerich.com>
parents: 15814
diff changeset
206 (host, nicefingerprint))