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annotate mercurial/sslutil.py @ 23042:2cd3fa4412dc

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ssl: only use the dummy cert hack if using an Apple Python (issue4410) The hack for using certificate store in addition to the provided CAs resides in Apple's OpenSSL. Apple's own Pythons will use it, but other custom built Pythons might use a custom built OpenSSL without that hack and will fail when exposed to the dummy cacert introduced in d7f7f1860f00. There do not seem to be a simple way to check from Python if we are using a patched OpenSSL or if it is an Apple OpenSSL. Instead, check if the Python executable resides in /usr/bin/python* or in /System/Library/Frameworks/Python.framework/ and assume that all Pythons found there will be native Pythons using the patched OpenSSL. Custom built Pythons will not get the benefit of using the CAs from the certificate store.
author Mads Kiilerich <madski@unity3d.com>
date Fri, 17 Oct 2014 18:56:12 +0200
parents d7f7f1860f00
children 22db405536be
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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 import os, sys
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10
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11 from mercurial import util
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12 from mercurial.i18n import _
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13 try:
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14 # avoid using deprecated/broken FakeSocket in python 2.6
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15 import ssl
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16 CERT_REQUIRED = ssl.CERT_REQUIRED
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17 PROTOCOL_SSLv23 = ssl.PROTOCOL_SSLv23
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18 PROTOCOL_TLSv1 = ssl.PROTOCOL_TLSv1
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19 def ssl_wrap_socket(sock, keyfile, certfile, ssl_version=PROTOCOL_TLSv1,
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20 cert_reqs=ssl.CERT_NONE, ca_certs=None):
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21 sslsocket = ssl.wrap_socket(sock, keyfile, certfile,
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22 cert_reqs=cert_reqs, ca_certs=ca_certs,
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23 ssl_version=ssl_version)
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24 # check if wrap_socket failed silently because socket had been closed
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25 # - see http://bugs.python.org/issue13721
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26 if not sslsocket.cipher():
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27 raise util.Abort(_('ssl connection failed'))
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28 return sslsocket
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29 except ImportError:
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30 CERT_REQUIRED = 2
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31
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32 PROTOCOL_SSLv23 = 2
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33 PROTOCOL_TLSv1 = 3
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34
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35 import socket, httplib
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36
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37 def ssl_wrap_socket(sock, keyfile, certfile, ssl_version=PROTOCOL_TLSv1,
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38 cert_reqs=CERT_REQUIRED, ca_certs=None):
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39 if not util.safehasattr(socket, 'ssl'):
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40 raise util.Abort(_('Python SSL support not found'))
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41 if ca_certs:
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42 raise util.Abort(_(
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43 'certificate checking requires Python 2.6'))
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44
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45 ssl = socket.ssl(sock, keyfile, certfile)
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46 return httplib.FakeSocket(sock, ssl)
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47
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48 def _verifycert(cert, hostname):
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49 '''Verify that cert (in socket.getpeercert() format) matches hostname.
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50 CRLs is not handled.
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51
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52 Returns error message if any problems are found and None on success.
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53 '''
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54 if not cert:
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55 return _('no certificate received')
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56 dnsname = hostname.lower()
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57 def matchdnsname(certname):
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58 return (certname == dnsname or
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59 '.' in dnsname and certname == '*.' + dnsname.split('.', 1)[1])
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60
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61 san = cert.get('subjectAltName', [])
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62 if san:
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63 certnames = [value.lower() for key, value in san if key == 'DNS']
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64 for name in certnames:
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65 if matchdnsname(name):
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66 return None
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67 if certnames:
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68 return _('certificate is for %s') % ', '.join(certnames)
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69
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70 # subject is only checked when subjectAltName is empty
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71 for s in cert.get('subject', []):
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72 key, value = s[0]
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73 if key == 'commonName':
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74 try:
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75 # 'subject' entries are unicode
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76 certname = value.lower().encode('ascii')
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77 except UnicodeEncodeError:
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78 return _('IDN in certificate not supported')
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79 if matchdnsname(certname):
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80 return None
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81 return _('certificate is for %s') % certname
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82 return _('no commonName or subjectAltName found in certificate')
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83
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84
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85 # CERT_REQUIRED means fetch the cert from the server all the time AND
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86 # validate it against the CA store provided in web.cacerts.
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87 #
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88 # We COMPLETELY ignore CERT_REQUIRED on Python <= 2.5, as it's totally
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89 # busted on those versions.
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90
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91 def _plainapplepython():
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92 """return true if this seems to be a pure Apple Python that
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93 * is unfrozen and presumably has the whole mercurial module in the file
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94 system
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95 * presumably is an Apple Python that uses Apple OpenSSL which has patches
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96 for using system certificate store CAs in addition to the provided
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97 cacerts file
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98 """
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99 if sys.platform != 'darwin' or util.mainfrozen():
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100 return False
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101 exe = (sys.executable or '').lower()
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102 return (exe.startswith('/usr/bin/python') or
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103 exe.startswith('/system/library/frameworks/python.framework/'))
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104
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105 def sslkwargs(ui, host):
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106 forcetls = ui.configbool('ui', 'tls', default=True)
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107 if forcetls:
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108 ssl_version = PROTOCOL_TLSv1
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109 else:
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110 ssl_version = PROTOCOL_SSLv23
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111 kws = {'ssl_version': ssl_version,
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112 }
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113 hostfingerprint = ui.config('hostfingerprints', host)
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114 if hostfingerprint:
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115 return kws
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116 cacerts = ui.config('web', 'cacerts')
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117 if cacerts:
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118 cacerts = util.expandpath(cacerts)
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119 if not os.path.exists(cacerts):
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120 raise util.Abort(_('could not find web.cacerts: %s') % cacerts)
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121 elif cacerts is None and _plainapplepython():
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122 dummycert = os.path.join(os.path.dirname(__file__), 'dummycert.pem')
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123 if os.path.exists(dummycert):
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124 ui.debug('using %s to enable OS X system CA\n' % dummycert)
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125 ui.setconfig('web', 'cacerts', dummycert, 'dummy')
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126 cacerts = dummycert
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127 if cacerts:
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128 kws.update({'ca_certs': cacerts,
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129 'cert_reqs': CERT_REQUIRED,
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130 })
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131 return kws
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132
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133 class validator(object):
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134 def __init__(self, ui, host):
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135 self.ui = ui
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136 self.host = host
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137
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138 def __call__(self, sock, strict=False):
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139 host = self.host
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140 cacerts = self.ui.config('web', 'cacerts')
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141 hostfingerprint = self.ui.config('hostfingerprints', host)
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142 if not getattr(sock, 'getpeercert', False): # python 2.5 ?
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143 if hostfingerprint:
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144 raise util.Abort(_("host fingerprint for %s can't be "
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145 "verified (Python too old)") % host)
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146 if strict:
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147 raise util.Abort(_("certificate for %s can't be verified "
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148 "(Python too old)") % host)
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149 if self.ui.configbool('ui', 'reportoldssl', True):
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150 self.ui.warn(_("warning: certificate for %s can't be verified "
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151 "(Python too old)\n") % host)
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152 return
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153
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154 if not sock.cipher(): # work around http://bugs.python.org/issue13721
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155 raise util.Abort(_('%s ssl connection error') % host)
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156 try:
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157 peercert = sock.getpeercert(True)
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158 peercert2 = sock.getpeercert()
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159 except AttributeError:
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160 raise util.Abort(_('%s ssl connection error') % host)
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161
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162 if not peercert:
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163 raise util.Abort(_('%s certificate error: '
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164 'no certificate received') % host)
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165 peerfingerprint = util.sha1(peercert).hexdigest()
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166 nicefingerprint = ":".join([peerfingerprint[x:x + 2]
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167 for x in xrange(0, len(peerfingerprint), 2)])
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168 if hostfingerprint:
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169 if peerfingerprint.lower() != \
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170 hostfingerprint.replace(':', '').lower():
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171 raise util.Abort(_('certificate for %s has unexpected '
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172 'fingerprint %s') % (host, nicefingerprint),
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173 hint=_('check hostfingerprint configuration'))
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174 self.ui.debug('%s certificate matched fingerprint %s\n' %
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175 (host, nicefingerprint))
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176 elif cacerts:
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177 msg = _verifycert(peercert2, host)
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178 if msg:
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179 raise util.Abort(_('%s certificate error: %s') % (host, msg),
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180 hint=_('configure hostfingerprint %s or use '
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181 '--insecure to connect insecurely') %
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182 nicefingerprint)
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183 self.ui.debug('%s certificate successfully verified\n' % host)
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184 elif strict:
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185 raise util.Abort(_('%s certificate with fingerprint %s not '
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186 'verified') % (host, nicefingerprint),
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187 hint=_('check hostfingerprints or web.cacerts '
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diff changeset
188 'config setting'))
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189 else:
15815
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190 self.ui.warn(_('warning: %s certificate with fingerprint %s not '
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diff changeset
191 'verified (check hostfingerprints or web.cacerts '
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192 'config setting)\n') %
edc3a901a63d sslutil: reorder validator code to make it more readable
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193 (host, nicefingerprint))