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annotate mercurial/sslutil.py @ 26534:e4f27fb65da7

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merge: drop special parent assignment in the obsolete case We can safely drop this because the very same assignment is enforcement later in the function. Dropping it will make it simpler to extract the default destination logic in its own function.
author Pierre-Yves David <pierre-yves.david@fb.com>
date Mon, 05 Oct 2015 01:47:33 -0700
parents 696f6e2be282
children 56b2bcea2529
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 util
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18
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19 _canloaddefaultcerts = False
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20 try:
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21 ssl_context = ssl.SSLContext
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22 _canloaddefaultcerts = util.safehasattr(ssl_context, 'load_default_certs')
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23
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24 def wrapsocket(sock, keyfile, certfile, ui, cert_reqs=ssl.CERT_NONE,
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25 ca_certs=None, serverhostname=None):
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26 # Allow any version of SSL starting with TLSv1 and
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27 # up. Note that specifying TLSv1 here prohibits use of
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28 # newer standards (like TLSv1_2), so this is the right way
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29 # to do this. Note that in the future it'd be better to
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30 # support using ssl.create_default_context(), which sets
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31 # up a bunch of things in smart ways (strong ciphers,
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32 # protocol versions, etc) and is upgraded by Python
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33 # maintainers for us, but that breaks too many things to
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34 # do it in a hurry.
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35 sslcontext = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
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36 sslcontext.options &= ssl.OP_NO_SSLv2 & ssl.OP_NO_SSLv3
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37 if certfile is not None:
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38 def password():
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39 f = keyfile or certfile
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40 return ui.getpass(_('passphrase for %s: ') % f, '')
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41 sslcontext.load_cert_chain(certfile, keyfile, password)
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42 sslcontext.verify_mode = cert_reqs
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43 if ca_certs is not None:
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44 sslcontext.load_verify_locations(cafile=ca_certs)
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45 elif _canloaddefaultcerts:
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46 sslcontext.load_default_certs()
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47
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48 sslsocket = sslcontext.wrap_socket(sock, server_hostname=serverhostname)
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49 # check if wrap_socket failed silently because socket had been
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50 # closed
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51 # - see http://bugs.python.org/issue13721
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52 if not sslsocket.cipher():
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53 raise util.Abort(_('ssl connection failed'))
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54 return sslsocket
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55 except AttributeError:
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56 def wrapsocket(sock, keyfile, certfile, ui, cert_reqs=ssl.CERT_NONE,
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57 ca_certs=None, serverhostname=None):
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58 sslsocket = ssl.wrap_socket(sock, keyfile, certfile,
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59 cert_reqs=cert_reqs, ca_certs=ca_certs,
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60 ssl_version=ssl.PROTOCOL_TLSv1)
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61 # check if wrap_socket failed silently because socket had been
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62 # closed
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63 # - see http://bugs.python.org/issue13721
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64 if not sslsocket.cipher():
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65 raise util.Abort(_('ssl connection failed'))
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66 return sslsocket
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67
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68 def _verifycert(cert, hostname):
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69 '''Verify that cert (in socket.getpeercert() format) matches hostname.
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70 CRLs is not handled.
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71
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72 Returns error message if any problems are found and None on success.
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73 '''
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74 if not cert:
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75 return _('no certificate received')
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76 dnsname = hostname.lower()
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77 def matchdnsname(certname):
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78 return (certname == dnsname or
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79 '.' in dnsname and certname == '*.' + dnsname.split('.', 1)[1])
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80
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81 san = cert.get('subjectAltName', [])
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82 if san:
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83 certnames = [value.lower() for key, value in san if key == 'DNS']
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84 for name in certnames:
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85 if matchdnsname(name):
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86 return None
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87 if certnames:
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88 return _('certificate is for %s') % ', '.join(certnames)
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89
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90 # subject is only checked when subjectAltName is empty
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91 for s in cert.get('subject', []):
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92 key, value = s[0]
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93 if key == 'commonName':
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94 try:
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95 # 'subject' entries are unicode
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96 certname = value.lower().encode('ascii')
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97 except UnicodeEncodeError:
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98 return _('IDN in certificate not supported')
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99 if matchdnsname(certname):
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100 return None
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101 return _('certificate is for %s') % certname
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102 return _('no commonName or subjectAltName found in certificate')
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103
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104
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105 # CERT_REQUIRED means fetch the cert from the server all the time AND
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106 # validate it against the CA store provided in web.cacerts.
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107
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108 def _plainapplepython():
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109 """return true if this seems to be a pure Apple Python that
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110 * is unfrozen and presumably has the whole mercurial module in the file
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111 system
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112 * presumably is an Apple Python that uses Apple OpenSSL which has patches
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113 for using system certificate store CAs in addition to the provided
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114 cacerts file
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115 """
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116 if sys.platform != 'darwin' or util.mainfrozen() or not sys.executable:
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117 return False
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118 exe = os.path.realpath(sys.executable).lower()
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119 return (exe.startswith('/usr/bin/python') or
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120 exe.startswith('/system/library/frameworks/python.framework/'))
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121
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122 def _defaultcacerts():
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123 """return path to CA certificates; None for system's store; ! to disable"""
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124 if _plainapplepython():
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125 dummycert = os.path.join(os.path.dirname(__file__), 'dummycert.pem')
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126 if os.path.exists(dummycert):
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127 return dummycert
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128 if _canloaddefaultcerts:
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129 return None
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130 return '!'
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131
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132 def sslkwargs(ui, host):
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133 kws = {'ui': ui}
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134 hostfingerprint = ui.config('hostfingerprints', host)
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135 if hostfingerprint:
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136 return kws
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137 cacerts = ui.config('web', 'cacerts')
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138 if cacerts == '!':
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139 pass
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140 elif cacerts:
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141 cacerts = util.expandpath(cacerts)
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parents:
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142 if not os.path.exists(cacerts):
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143 raise util.Abort(_('could not find web.cacerts: %s') % cacerts)
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144 else:
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diff changeset
145 cacerts = _defaultcacerts()
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parents: 24288
diff changeset
146 if cacerts and cacerts != '!':
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parents: 24288
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147 ui.debug('using %s to enable OS X system CA\n' % cacerts)
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148 ui.setconfig('web', 'cacerts', cacerts, 'defaultcacerts')
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diff changeset
149 if cacerts != '!':
19806
47ff9d1abfa9 sslutil: add a config knob to support TLS (default) or SSLv23 (bc) (issue4038)
Augie Fackler <raf@durin42.com>
parents: 19749
diff changeset
150 kws.update({'ca_certs': cacerts,
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parents: 25431
diff changeset
151 'cert_reqs': ssl.CERT_REQUIRED,
19806
47ff9d1abfa9 sslutil: add a config knob to support TLS (default) or SSLv23 (bc) (issue4038)
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parents: 19749
diff changeset
152 })
47ff9d1abfa9 sslutil: add a config knob to support TLS (default) or SSLv23 (bc) (issue4038)
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diff changeset
153 return kws
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154
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parents:
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155 class validator(object):
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156 def __init__(self, ui, host):
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parents:
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157 self.ui = ui
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parents:
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158 self.host = host
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parents:
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159
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diff changeset
160 def __call__(self, sock, strict=False):
14204
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parents:
diff changeset
161 host = self.host
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parents:
diff changeset
162 cacerts = self.ui.config('web', 'cacerts')
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parents:
diff changeset
163 hostfingerprint = self.ui.config('hostfingerprints', host)
18879
93b03a222c3e sslutil: try harder to avoid getpeercert problems
Matt Mackall <mpm@selenic.com>
parents: 16391
diff changeset
164
15816
4bb59919c905 sslutil: work around validator crash getting certificate on failed sockets
Mads Kiilerich <mads@kiilerich.com>
parents: 15815
diff changeset
165 if not sock.cipher(): # work around http://bugs.python.org/issue13721
4bb59919c905 sslutil: work around validator crash getting certificate on failed sockets
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parents: 15815
diff changeset
166 raise util.Abort(_('%s ssl connection error') % host)
18879
93b03a222c3e sslutil: try harder to avoid getpeercert problems
Matt Mackall <mpm@selenic.com>
parents: 16391
diff changeset
167 try:
93b03a222c3e sslutil: try harder to avoid getpeercert problems
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diff changeset
168 peercert = sock.getpeercert(True)
93b03a222c3e sslutil: try harder to avoid getpeercert problems
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parents: 16391
diff changeset
169 peercert2 = sock.getpeercert()
93b03a222c3e sslutil: try harder to avoid getpeercert problems
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parents: 16391
diff changeset
170 except AttributeError:
93b03a222c3e sslutil: try harder to avoid getpeercert problems
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parents: 16391
diff changeset
171 raise util.Abort(_('%s ssl connection error') % host)
93b03a222c3e sslutil: try harder to avoid getpeercert problems
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parents: 16391
diff changeset
172
15817
8f377751b510 sslutil: abort properly if no certificate received for https connection
Mads Kiilerich <mads@kiilerich.com>
parents: 15816
diff changeset
173 if not peercert:
8f377751b510 sslutil: abort properly if no certificate received for https connection
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parents: 15816
diff changeset
174 raise util.Abort(_('%s certificate error: '
8f377751b510 sslutil: abort properly if no certificate received for https connection
Mads Kiilerich <mads@kiilerich.com>
parents: 15816
diff changeset
175 'no certificate received') % host)
15814
c3e958b50a22 sslutil: show fingerprint when cacerts validation fails
Mads Kiilerich <mads@kiilerich.com>
parents: 15813
diff changeset
176 peerfingerprint = util.sha1(peercert).hexdigest()
c3e958b50a22 sslutil: show fingerprint when cacerts validation fails
Mads Kiilerich <mads@kiilerich.com>
parents: 15813
diff changeset
177 nicefingerprint = ":".join([peerfingerprint[x:x + 2]
c3e958b50a22 sslutil: show fingerprint when cacerts validation fails
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parents: 15813
diff changeset
178 for x in xrange(0, len(peerfingerprint), 2)])
15815
edc3a901a63d sslutil: reorder validator code to make it more readable
Mads Kiilerich <mads@kiilerich.com>
parents: 15814
diff changeset
179 if hostfingerprint:
edc3a901a63d sslutil: reorder validator code to make it more readable
Mads Kiilerich <mads@kiilerich.com>
parents: 15814
diff changeset
180 if peerfingerprint.lower() != \
edc3a901a63d sslutil: reorder validator code to make it more readable
Mads Kiilerich <mads@kiilerich.com>
parents: 15814
diff changeset
181 hostfingerprint.replace(':', '').lower():
15997
a45516cb8d9f sslutil: more helpful fingerprint mismatch message
Matt Mackall <mpm@selenic.com>
parents: 15817
diff changeset
182 raise util.Abort(_('certificate for %s has unexpected '
a45516cb8d9f sslutil: more helpful fingerprint mismatch message
Matt Mackall <mpm@selenic.com>
parents: 15817
diff changeset
183 'fingerprint %s') % (host, nicefingerprint),
a45516cb8d9f sslutil: more helpful fingerprint mismatch message
Matt Mackall <mpm@selenic.com>
parents: 15817
diff changeset
184 hint=_('check hostfingerprint configuration'))
15815
edc3a901a63d sslutil: reorder validator code to make it more readable
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parents: 15814
diff changeset
185 self.ui.debug('%s certificate matched fingerprint %s\n' %
edc3a901a63d sslutil: reorder validator code to make it more readable
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parents: 15814
diff changeset
186 (host, nicefingerprint))
24290
b76d8c641746 ssl: set explicit symbol "!" to web.cacerts to disable SSL verification (BC)
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parents: 24288
diff changeset
187 elif cacerts != '!':
18879
93b03a222c3e sslutil: try harder to avoid getpeercert problems
Matt Mackall <mpm@selenic.com>
parents: 16391
diff changeset
188 msg = _verifycert(peercert2, host)
14204
5fa21960b2f4 sslutil: extracted ssl methods from httpsconnection in url.py
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parents:
diff changeset
189 if msg:
15814
c3e958b50a22 sslutil: show fingerprint when cacerts validation fails
Mads Kiilerich <mads@kiilerich.com>
parents: 15813
diff changeset
190 raise util.Abort(_('%s certificate error: %s') % (host, msg),
c3e958b50a22 sslutil: show fingerprint when cacerts validation fails
Mads Kiilerich <mads@kiilerich.com>
parents: 15813
diff changeset
191 hint=_('configure hostfingerprint %s or use '
c3e958b50a22 sslutil: show fingerprint when cacerts validation fails
Mads Kiilerich <mads@kiilerich.com>
parents: 15813
diff changeset
192 '--insecure to connect insecurely') %
c3e958b50a22 sslutil: show fingerprint when cacerts validation fails
Mads Kiilerich <mads@kiilerich.com>
parents: 15813
diff changeset
193 nicefingerprint)
14204
5fa21960b2f4 sslutil: extracted ssl methods from httpsconnection in url.py
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parents:
diff changeset
194 self.ui.debug('%s certificate successfully verified\n' % host)
18887
2d7fac049d3a sslutil: abort if peer certificate is not verified for secure use
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 18879
diff changeset
195 elif strict:
2d7fac049d3a sslutil: abort if peer certificate is not verified for secure use
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 18879
diff changeset
196 raise util.Abort(_('%s certificate with fingerprint %s not '
2d7fac049d3a sslutil: abort if peer certificate is not verified for secure use
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 18879
diff changeset
197 'verified') % (host, nicefingerprint),
2d7fac049d3a sslutil: abort if peer certificate is not verified for secure use
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 18879
diff changeset
198 hint=_('check hostfingerprints or web.cacerts '
2d7fac049d3a sslutil: abort if peer certificate is not verified for secure use
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 18879
diff changeset
199 'config setting'))
14204
5fa21960b2f4 sslutil: extracted ssl methods from httpsconnection in url.py
Augie Fackler <durin42@gmail.com>
parents:
diff changeset
200 else:
15815
edc3a901a63d sslutil: reorder validator code to make it more readable
Mads Kiilerich <mads@kiilerich.com>
parents: 15814
diff changeset
201 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
202 '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
203 'config setting)\n') %
edc3a901a63d sslutil: reorder validator code to make it more readable
Mads Kiilerich <mads@kiilerich.com>
parents: 15814
diff changeset
204 (host, nicefingerprint))