Mercurial > hg
annotate mercurial/sslutil.py @ 28157:e7c9b59dbbcf
commandserver: use _readlist
Use _readlist introduced in previous commit to make the code shorter.
author | Jun Wu <quark@fb.com> |
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date | Mon, 15 Feb 2016 14:20:41 +0000 |
parents | 6c7d26cef0cd |
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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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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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166 |
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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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169 try: |
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170 peercert = sock.getpeercert(True) |
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171 peercert2 = sock.getpeercert() |
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172 except AttributeError: |
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173 raise error.Abort(_('%s ssl connection error') % host) |
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174 |
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175 if not peercert: |
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176 raise error.Abort(_('%s certificate error: ' |
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177 'no certificate received') % host) |
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178 peerfingerprint = util.sha1(peercert).hexdigest() |
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179 nicefingerprint = ":".join([peerfingerprint[x:x + 2] |
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180 for x in xrange(0, len(peerfingerprint), 2)]) |
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181 if hostfingerprint: |
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182 if peerfingerprint.lower() != \ |
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183 hostfingerprint.replace(':', '').lower(): |
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184 raise error.Abort(_('certificate for %s has unexpected ' |
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185 'fingerprint %s') % (host, nicefingerprint), |
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186 hint=_('check hostfingerprint configuration')) |
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187 self.ui.debug('%s certificate matched fingerprint %s\n' % |
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188 (host, nicefingerprint)) |
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189 elif cacerts != '!': |
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190 msg = _verifycert(peercert2, host) |
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191 if msg: |
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192 raise error.Abort(_('%s certificate error: %s') % (host, msg), |
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193 hint=_('configure hostfingerprint %s or use ' |
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194 '--insecure to connect insecurely') % |
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195 nicefingerprint) |
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196 self.ui.debug('%s certificate successfully verified\n' % host) |
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197 elif strict: |
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198 raise error.Abort(_('%s certificate with fingerprint %s not ' |
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199 'verified') % (host, nicefingerprint), |
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200 hint=_('check hostfingerprints or web.cacerts ' |
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201 'config setting')) |
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202 else: |
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203 self.ui.warn(_('warning: %s certificate with fingerprint %s not ' |
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204 'verified (check hostfingerprints or web.cacerts ' |
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205 'config setting)\n') % |
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206 (host, nicefingerprint)) |