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annotate mercurial/sslutil.py @ 25430:19fa0cb71cd3

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ssl: drop support for Python < 2.6, require ssl module try-except clause is kept for readability of this patch, and it will be removed soon.
author Yuya Nishihara <yuya@tcha.org>
date Fri, 05 Jun 2015 21:37:46 +0900
parents 9d1c61715939
children 96159068c506
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5fa21960b2f4 sslutil: extracted ssl methods from httpsconnection in url.py
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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, ssl
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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
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14 _canloaddefaultcerts = False
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15 try:
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16 CERT_REQUIRED = ssl.CERT_REQUIRED
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17 try:
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18 ssl_context = ssl.SSLContext
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19 _canloaddefaultcerts = util.safehasattr(ssl_context,
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20 'load_default_certs')
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21
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22 def wrapsocket(sock, keyfile, certfile, ui,
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23 cert_reqs=ssl.CERT_NONE,
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24 ca_certs=None, serverhostname=None):
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25 # Allow any version of SSL starting with TLSv1 and
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26 # up. Note that specifying TLSv1 here prohibits use of
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27 # newer standards (like TLSv1_2), so this is the right way
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28 # to do this. Note that in the future it'd be better to
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29 # support using ssl.create_default_context(), which sets
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30 # up a bunch of things in smart ways (strong ciphers,
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31 # protocol versions, etc) and is upgraded by Python
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32 # maintainers for us, but that breaks too many things to
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33 # do it in a hurry.
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34 sslcontext = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
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35 sslcontext.options &= ssl.OP_NO_SSLv2 & ssl.OP_NO_SSLv3
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36 if certfile is not None:
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37 def password():
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38 f = keyfile or certfile
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39 return ui.getpass(_('passphrase for %s: ') % f, '')
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40 sslcontext.load_cert_chain(certfile, keyfile, password)
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41 sslcontext.verify_mode = cert_reqs
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42 if ca_certs is not None:
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43 sslcontext.load_verify_locations(cafile=ca_certs)
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44 elif _canloaddefaultcerts:
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45 sslcontext.load_default_certs()
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46
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47 sslsocket = sslcontext.wrap_socket(sock,
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48 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,
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57 cert_reqs=ssl.CERT_NONE,
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58 ca_certs=None, serverhostname=None):
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59 sslsocket = ssl.wrap_socket(sock, keyfile, certfile,
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60 cert_reqs=cert_reqs, ca_certs=ca_certs,
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61 ssl_version=ssl.PROTOCOL_TLSv1)
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62 # check if wrap_socket failed silently because socket had been
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63 # closed
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64 # - see http://bugs.python.org/issue13721
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65 if not sslsocket.cipher():
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66 raise util.Abort(_('ssl connection failed'))
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67 return sslsocket
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68 except ImportError:
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69 raise
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70
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71 def _verifycert(cert, hostname):
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72 '''Verify that cert (in socket.getpeercert() format) matches hostname.
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73 CRLs is not handled.
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74
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75 Returns error message if any problems are found and None on success.
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76 '''
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77 if not cert:
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78 return _('no certificate received')
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79 dnsname = hostname.lower()
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80 def matchdnsname(certname):
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81 return (certname == dnsname or
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82 '.' in dnsname and certname == '*.' + dnsname.split('.', 1)[1])
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83
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84 san = cert.get('subjectAltName', [])
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85 if san:
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86 certnames = [value.lower() for key, value in san if key == 'DNS']
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87 for name in certnames:
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88 if matchdnsname(name):
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89 return None
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90 if certnames:
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91 return _('certificate is for %s') % ', '.join(certnames)
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92
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93 # subject is only checked when subjectAltName is empty
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94 for s in cert.get('subject', []):
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95 key, value = s[0]
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96 if key == 'commonName':
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97 try:
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98 # 'subject' entries are unicode
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99 certname = value.lower().encode('ascii')
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100 except UnicodeEncodeError:
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101 return _('IDN in certificate not supported')
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102 if matchdnsname(certname):
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103 return None
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104 return _('certificate is for %s') % certname
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105 return _('no commonName or subjectAltName found in certificate')
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106
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107
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108 # CERT_REQUIRED means fetch the cert from the server all the time AND
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109 # validate it against the CA store provided in web.cacerts.
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110
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111 def _plainapplepython():
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112 """return true if this seems to be a pure Apple Python that
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113 * is unfrozen and presumably has the whole mercurial module in the file
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114 system
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115 * presumably is an Apple Python that uses Apple OpenSSL which has patches
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116 for using system certificate store CAs in addition to the provided
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117 cacerts file
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118 """
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119 if sys.platform != 'darwin' or util.mainfrozen() or not sys.executable:
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120 return False
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Yuya Nishihara <yuya@tcha.org>
parents: 24291
diff changeset
121 exe = os.path.realpath(sys.executable).lower()
23042
2cd3fa4412dc ssl: only use the dummy cert hack if using an Apple Python (issue4410)
Mads Kiilerich <madski@unity3d.com>
parents: 22575
diff changeset
122 return (exe.startswith('/usr/bin/python') or
2cd3fa4412dc ssl: only use the dummy cert hack if using an Apple Python (issue4410)
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parents: 22575
diff changeset
123 exe.startswith('/system/library/frameworks/python.framework/'))
2cd3fa4412dc ssl: only use the dummy cert hack if using an Apple Python (issue4410)
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parents: 22575
diff changeset
124
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parents: 23851
diff changeset
125 def _defaultcacerts():
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126 """return path to CA certificates; None for system's store; ! to disable"""
24288
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parents: 23851
diff changeset
127 if _plainapplepython():
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parents: 23851
diff changeset
128 dummycert = os.path.join(os.path.dirname(__file__), 'dummycert.pem')
922e087ba158 ssl: extract function that returns dummycert path on Apple python
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parents: 23851
diff changeset
129 if os.path.exists(dummycert):
922e087ba158 ssl: extract function that returns dummycert path on Apple python
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parents: 23851
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130 return dummycert
24291
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parents: 24290
diff changeset
131 if _canloaddefaultcerts:
760a86865f80 ssl: load CA certificates from system's store by default on Python 2.7.9
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diff changeset
132 return None
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parents: 24288
diff changeset
133 return '!'
24288
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parents: 23851
diff changeset
134
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parents:
diff changeset
135 def sslkwargs(ui, host):
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21b536f01eda ssl: prompt passphrase of client key file via ui.getpass() (issue4648)
Yuya Nishihara <yuya@tcha.org>
parents: 24614
diff changeset
136 kws = {'ui': ui}
22574
a00a7951b20c ssl: refactor sslkwargs - move things around a bit, preparing for next change
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parents: 19808
diff changeset
137 hostfingerprint = ui.config('hostfingerprints', host)
a00a7951b20c ssl: refactor sslkwargs - move things around a bit, preparing for next change
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parents: 19808
diff changeset
138 if hostfingerprint:
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parents: 19808
diff changeset
139 return kws
a00a7951b20c ssl: refactor sslkwargs - move things around a bit, preparing for next change
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parents: 19808
diff changeset
140 cacerts = ui.config('web', 'cacerts')
24290
b76d8c641746 ssl: set explicit symbol "!" to web.cacerts to disable SSL verification (BC)
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parents: 24288
diff changeset
141 if cacerts == '!':
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Yuya Nishihara <yuya@tcha.org>
parents: 24288
diff changeset
142 pass
b76d8c641746 ssl: set explicit symbol "!" to web.cacerts to disable SSL verification (BC)
Yuya Nishihara <yuya@tcha.org>
parents: 24288
diff changeset
143 elif cacerts:
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Augie Fackler <durin42@gmail.com>
parents:
diff changeset
144 cacerts = util.expandpath(cacerts)
5fa21960b2f4 sslutil: extracted ssl methods from httpsconnection in url.py
Augie Fackler <durin42@gmail.com>
parents:
diff changeset
145 if not os.path.exists(cacerts):
5fa21960b2f4 sslutil: extracted ssl methods from httpsconnection in url.py
Augie Fackler <durin42@gmail.com>
parents:
diff changeset
146 raise util.Abort(_('could not find web.cacerts: %s') % cacerts)
24290
b76d8c641746 ssl: set explicit symbol "!" to web.cacerts to disable SSL verification (BC)
Yuya Nishihara <yuya@tcha.org>
parents: 24288
diff changeset
147 else:
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parents: 24288
diff changeset
148 cacerts = _defaultcacerts()
b76d8c641746 ssl: set explicit symbol "!" to web.cacerts to disable SSL verification (BC)
Yuya Nishihara <yuya@tcha.org>
parents: 24288
diff changeset
149 if cacerts and cacerts != '!':
b76d8c641746 ssl: set explicit symbol "!" to web.cacerts to disable SSL verification (BC)
Yuya Nishihara <yuya@tcha.org>
parents: 24288
diff changeset
150 ui.debug('using %s to enable OS X system CA\n' % cacerts)
b76d8c641746 ssl: set explicit symbol "!" to web.cacerts to disable SSL verification (BC)
Yuya Nishihara <yuya@tcha.org>
parents: 24288
diff changeset
151 ui.setconfig('web', 'cacerts', cacerts, 'defaultcacerts')
b76d8c641746 ssl: set explicit symbol "!" to web.cacerts to disable SSL verification (BC)
Yuya Nishihara <yuya@tcha.org>
parents: 24288
diff changeset
152 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
153 kws.update({'ca_certs': cacerts,
47ff9d1abfa9 sslutil: add a config knob to support TLS (default) or SSLv23 (bc) (issue4038)
Augie Fackler <raf@durin42.com>
parents: 19749
diff changeset
154 'cert_reqs': CERT_REQUIRED,
47ff9d1abfa9 sslutil: add a config knob to support TLS (default) or SSLv23 (bc) (issue4038)
Augie Fackler <raf@durin42.com>
parents: 19749
diff changeset
155 })
47ff9d1abfa9 sslutil: add a config knob to support TLS (default) or SSLv23 (bc) (issue4038)
Augie Fackler <raf@durin42.com>
parents: 19749
diff changeset
156 return kws
14204
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Augie Fackler <durin42@gmail.com>
parents:
diff changeset
157
5fa21960b2f4 sslutil: extracted ssl methods from httpsconnection in url.py
Augie Fackler <durin42@gmail.com>
parents:
diff changeset
158 class validator(object):
5fa21960b2f4 sslutil: extracted ssl methods from httpsconnection in url.py
Augie Fackler <durin42@gmail.com>
parents:
diff changeset
159 def __init__(self, ui, host):
5fa21960b2f4 sslutil: extracted ssl methods from httpsconnection in url.py
Augie Fackler <durin42@gmail.com>
parents:
diff changeset
160 self.ui = ui
5fa21960b2f4 sslutil: extracted ssl methods from httpsconnection in url.py
Augie Fackler <durin42@gmail.com>
parents:
diff changeset
161 self.host = host
5fa21960b2f4 sslutil: extracted ssl methods from httpsconnection in url.py
Augie Fackler <durin42@gmail.com>
parents:
diff changeset
162
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2d7fac049d3a sslutil: abort if peer certificate is not verified for secure use
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 18879
diff changeset
163 def __call__(self, sock, strict=False):
14204
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Augie Fackler <durin42@gmail.com>
parents:
diff changeset
164 host = self.host
5fa21960b2f4 sslutil: extracted ssl methods from httpsconnection in url.py
Augie Fackler <durin42@gmail.com>
parents:
diff changeset
165 cacerts = self.ui.config('web', 'cacerts')
5fa21960b2f4 sslutil: extracted ssl methods from httpsconnection in url.py
Augie Fackler <durin42@gmail.com>
parents:
diff changeset
166 hostfingerprint = self.ui.config('hostfingerprints', host)
18879
93b03a222c3e sslutil: try harder to avoid getpeercert problems
Matt Mackall <mpm@selenic.com>
parents: 16391
diff changeset
167
15816
4bb59919c905 sslutil: work around validator crash getting certificate on failed sockets
Mads Kiilerich <mads@kiilerich.com>
parents: 15815
diff changeset
168 if not sock.cipher(): # work around http://bugs.python.org/issue13721
4bb59919c905 sslutil: work around validator crash getting certificate on failed sockets
Mads Kiilerich <mads@kiilerich.com>
parents: 15815
diff changeset
169 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
170 try:
93b03a222c3e sslutil: try harder to avoid getpeercert problems
Matt Mackall <mpm@selenic.com>
parents: 16391
diff changeset
171 peercert = sock.getpeercert(True)
93b03a222c3e sslutil: try harder to avoid getpeercert problems
Matt Mackall <mpm@selenic.com>
parents: 16391
diff changeset
172 peercert2 = sock.getpeercert()
93b03a222c3e sslutil: try harder to avoid getpeercert problems
Matt Mackall <mpm@selenic.com>
parents: 16391
diff changeset
173 except AttributeError:
93b03a222c3e sslutil: try harder to avoid getpeercert problems
Matt Mackall <mpm@selenic.com>
parents: 16391
diff changeset
174 raise util.Abort(_('%s ssl connection error') % host)
93b03a222c3e sslutil: try harder to avoid getpeercert problems
Matt Mackall <mpm@selenic.com>
parents: 16391
diff changeset
175
15817
8f377751b510 sslutil: abort properly if no certificate received for https connection
Mads Kiilerich <mads@kiilerich.com>
parents: 15816
diff changeset
176 if not peercert:
8f377751b510 sslutil: abort properly if no certificate received for https connection
Mads Kiilerich <mads@kiilerich.com>
parents: 15816
diff changeset
177 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
178 'no certificate received') % host)
15814
c3e958b50a22 sslutil: show fingerprint when cacerts validation fails
Mads Kiilerich <mads@kiilerich.com>
parents: 15813
diff changeset
179 peerfingerprint = util.sha1(peercert).hexdigest()
c3e958b50a22 sslutil: show fingerprint when cacerts validation fails
Mads Kiilerich <mads@kiilerich.com>
parents: 15813
diff changeset
180 nicefingerprint = ":".join([peerfingerprint[x:x + 2]
c3e958b50a22 sslutil: show fingerprint when cacerts validation fails
Mads Kiilerich <mads@kiilerich.com>
parents: 15813
diff changeset
181 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
182 if hostfingerprint:
edc3a901a63d sslutil: reorder validator code to make it more readable
Mads Kiilerich <mads@kiilerich.com>
parents: 15814
diff changeset
183 if peerfingerprint.lower() != \
edc3a901a63d sslutil: reorder validator code to make it more readable
Mads Kiilerich <mads@kiilerich.com>
parents: 15814
diff changeset
184 hostfingerprint.replace(':', '').lower():
15997
a45516cb8d9f sslutil: more helpful fingerprint mismatch message
Matt Mackall <mpm@selenic.com>
parents: 15817
diff changeset
185 raise util.Abort(_('certificate for %s has unexpected '
a45516cb8d9f sslutil: more helpful fingerprint mismatch message
Matt Mackall <mpm@selenic.com>
parents: 15817
diff changeset
186 'fingerprint %s') % (host, nicefingerprint),
a45516cb8d9f sslutil: more helpful fingerprint mismatch message
Matt Mackall <mpm@selenic.com>
parents: 15817
diff changeset
187 hint=_('check hostfingerprint configuration'))
15815
edc3a901a63d sslutil: reorder validator code to make it more readable
Mads Kiilerich <mads@kiilerich.com>
parents: 15814
diff changeset
188 self.ui.debug('%s certificate matched fingerprint %s\n' %
edc3a901a63d sslutil: reorder validator code to make it more readable
Mads Kiilerich <mads@kiilerich.com>
parents: 15814
diff changeset
189 (host, nicefingerprint))
24290
b76d8c641746 ssl: set explicit symbol "!" to web.cacerts to disable SSL verification (BC)
Yuya Nishihara <yuya@tcha.org>
parents: 24288
diff changeset
190 elif cacerts != '!':
18879
93b03a222c3e sslutil: try harder to avoid getpeercert problems
Matt Mackall <mpm@selenic.com>
parents: 16391
diff changeset
191 msg = _verifycert(peercert2, host)
14204
5fa21960b2f4 sslutil: extracted ssl methods from httpsconnection in url.py
Augie Fackler <durin42@gmail.com>
parents:
diff changeset
192 if msg:
15814
c3e958b50a22 sslutil: show fingerprint when cacerts validation fails
Mads Kiilerich <mads@kiilerich.com>
parents: 15813
diff changeset
193 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
194 hint=_('configure hostfingerprint %s or use '
c3e958b50a22 sslutil: show fingerprint when cacerts validation fails
Mads Kiilerich <mads@kiilerich.com>
parents: 15813
diff changeset
195 '--insecure to connect insecurely') %
c3e958b50a22 sslutil: show fingerprint when cacerts validation fails
Mads Kiilerich <mads@kiilerich.com>
parents: 15813
diff changeset
196 nicefingerprint)
14204
5fa21960b2f4 sslutil: extracted ssl methods from httpsconnection in url.py
Augie Fackler <durin42@gmail.com>
parents:
diff changeset
197 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
198 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
199 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
200 '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
201 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
202 'config setting'))
14204
5fa21960b2f4 sslutil: extracted ssl methods from httpsconnection in url.py
Augie Fackler <durin42@gmail.com>
parents:
diff changeset
203 else:
15815
edc3a901a63d sslutil: reorder validator code to make it more readable
Mads Kiilerich <mads@kiilerich.com>
parents: 15814
diff changeset
204 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
205 '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
206 'config setting)\n') %
edc3a901a63d sslutil: reorder validator code to make it more readable
Mads Kiilerich <mads@kiilerich.com>
parents: 15814
diff changeset
207 (host, nicefingerprint))