mercurial/sslutil.py
author Mads Kiilerich <mads@kiilerich.com>
Tue, 27 Sep 2011 18:51:10 +0200
changeset 15160 b2d4400398f3
parent 14667 8f12dac18d13
child 15812 0cc4ad757c77
permissions -rw-r--r--
sslutil: abort when ssl module is needed but not found It is apparently possible to compile Python without SSL support or leave it out when installing precompiled binaries. Mercurial on such Pythons would crash if the user tried to use https. Now it will be reported as "abort: Python SSL support not found" instead.
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# sslutil.py - SSL handling for mercurial
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#
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# Copyright 2005, 2006, 2007, 2008 Matt Mackall <mpm@selenic.com>
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# Copyright 2006, 2007 Alexis S. L. Carvalho <alexis@cecm.usp.br>
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# Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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import os
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from mercurial import util
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from mercurial.i18n import _
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try:
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    # avoid using deprecated/broken FakeSocket in python 2.6
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    import ssl
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    ssl_wrap_socket = ssl.wrap_socket
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    CERT_REQUIRED = ssl.CERT_REQUIRED
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except ImportError:
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    CERT_REQUIRED = 2
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    import socket, httplib
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    def ssl_wrap_socket(sock, key_file, cert_file,
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                        cert_reqs=CERT_REQUIRED, ca_certs=None):
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        if not util.safehasattr(socket, 'ssl'):
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            raise util.Abort(_('Python SSL support not found'))
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        if ca_certs:
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            raise util.Abort(_(
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                'certificate checking requires Python 2.6'))
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        ssl = socket.ssl(sock, key_file, cert_file)
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        return httplib.FakeSocket(sock, ssl)
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def _verifycert(cert, hostname):
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    '''Verify that cert (in socket.getpeercert() format) matches hostname.
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    CRLs is not handled.
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    Returns error message if any problems are found and None on success.
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    '''
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    if not cert:
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        return _('no certificate received')
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    dnsname = hostname.lower()
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    def matchdnsname(certname):
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        return (certname == dnsname or
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                '.' in dnsname and certname == '*.' + dnsname.split('.', 1)[1])
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    san = cert.get('subjectAltName', [])
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    if san:
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        certnames = [value.lower() for key, value in san if key == 'DNS']
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        for name in certnames:
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            if matchdnsname(name):
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                return None
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        if certnames:
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            return _('certificate is for %s') % ', '.join(certnames)
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    # subject is only checked when subjectAltName is empty
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    for s in cert.get('subject', []):
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        key, value = s[0]
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        if key == 'commonName':
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            try:
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                # 'subject' entries are unicode
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                certname = value.lower().encode('ascii')
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            except UnicodeEncodeError:
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                return _('IDN in certificate not supported')
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            if matchdnsname(certname):
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                return None
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            return _('certificate is for %s') % certname
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    return _('no commonName or subjectAltName found in certificate')
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# CERT_REQUIRED means fetch the cert from the server all the time AND
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# validate it against the CA store provided in web.cacerts.
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#
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# We COMPLETELY ignore CERT_REQUIRED on Python <= 2.5, as it's totally
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# busted on those versions.
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def sslkwargs(ui, host):
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    cacerts = ui.config('web', 'cacerts')
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    hostfingerprint = ui.config('hostfingerprints', host)
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    if cacerts and not hostfingerprint:
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        cacerts = util.expandpath(cacerts)
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        if not os.path.exists(cacerts):
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            raise util.Abort(_('could not find web.cacerts: %s') % cacerts)
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        return {'ca_certs': cacerts,
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                'cert_reqs': CERT_REQUIRED,
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                }
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    return {}
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class validator(object):
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    def __init__(self, ui, host):
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        self.ui = ui
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        self.host = host
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    def __call__(self, sock):
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        host = self.host
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        cacerts = self.ui.config('web', 'cacerts')
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        hostfingerprint = self.ui.config('hostfingerprints', host)
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        if cacerts and not hostfingerprint:
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            msg = _verifycert(sock.getpeercert(), host)
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            if msg:
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                raise util.Abort(_('%s certificate error: %s '
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                                   '(use --insecure to connect '
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                                   'insecurely)') % (host, msg))
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            self.ui.debug('%s certificate successfully verified\n' % host)
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        else:
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            if getattr(sock, 'getpeercert', False):
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                peercert = sock.getpeercert(True)
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                peerfingerprint = util.sha1(peercert).hexdigest()
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                nicefingerprint = ":".join([peerfingerprint[x:x + 2]
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                    for x in xrange(0, len(peerfingerprint), 2)])
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                if hostfingerprint:
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                    if peerfingerprint.lower() != \
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                            hostfingerprint.replace(':', '').lower():
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                        raise util.Abort(_('invalid certificate for %s '
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                                           'with fingerprint %s') %
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                                         (host, nicefingerprint))
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                    self.ui.debug('%s certificate matched fingerprint %s\n' %
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                                  (host, nicefingerprint))
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                else:
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                    self.ui.warn(_('warning: %s certificate '
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                                   'with fingerprint %s not verified '
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                                   '(check hostfingerprints or web.cacerts '
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                                   'config setting)\n') %
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                                 (host, nicefingerprint))
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            else: # python 2.5 ?
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                if hostfingerprint:
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                    raise util.Abort(_("host fingerprint for %s can't be "
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                                       "verified (Python too old)") % host)
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                self.ui.warn(_("warning: certificate for %s can't be "
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                               "verified (Python too old)\n") % host)