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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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from __future__ import absolute_import
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import os
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import ssl
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import sys
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from .i18n import _
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from . import util
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_canloaddefaultcerts = False
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try:
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ssl_context = ssl.SSLContext
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_canloaddefaultcerts = util.safehasattr(ssl_context, 'load_default_certs')
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def wrapsocket(sock, keyfile, certfile, ui, cert_reqs=ssl.CERT_NONE,
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ca_certs=None, serverhostname=None):
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# Allow any version of SSL starting with TLSv1 and
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# up. Note that specifying TLSv1 here prohibits use of
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# newer standards (like TLSv1_2), so this is the right way
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# to do this. Note that in the future it'd be better to
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# support using ssl.create_default_context(), which sets
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# up a bunch of things in smart ways (strong ciphers,
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# protocol versions, etc) and is upgraded by Python
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# maintainers for us, but that breaks too many things to
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# do it in a hurry.
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sslcontext = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
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sslcontext.options &= ssl.OP_NO_SSLv2 & ssl.OP_NO_SSLv3
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if certfile is not None:
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def password():
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f = keyfile or certfile
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return ui.getpass(_('passphrase for %s: ') % f, '')
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sslcontext.load_cert_chain(certfile, keyfile, password)
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sslcontext.verify_mode = cert_reqs
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if ca_certs is not None:
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sslcontext.load_verify_locations(cafile=ca_certs)
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elif _canloaddefaultcerts:
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sslcontext.load_default_certs()
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sslsocket = sslcontext.wrap_socket(sock, server_hostname=serverhostname)
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# check if wrap_socket failed silently because socket had been
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# closed
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# - see http://bugs.python.org/issue13721
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if not sslsocket.cipher():
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raise util.Abort(_('ssl connection failed'))
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return sslsocket
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except AttributeError:
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def wrapsocket(sock, keyfile, certfile, ui, cert_reqs=ssl.CERT_NONE,
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ca_certs=None, serverhostname=None):
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sslsocket = ssl.wrap_socket(sock, keyfile, certfile,
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cert_reqs=cert_reqs, ca_certs=ca_certs,
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ssl_version=ssl.PROTOCOL_TLSv1)
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# check if wrap_socket failed silently because socket had been
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# closed
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# - see http://bugs.python.org/issue13721
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if not sslsocket.cipher():
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raise util.Abort(_('ssl connection failed'))
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return sslsocket
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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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def _plainapplepython():
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"""return true if this seems to be a pure Apple Python that
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* is unfrozen and presumably has the whole mercurial module in the file
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system
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* presumably is an Apple Python that uses Apple OpenSSL which has patches
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for using system certificate store CAs in addition to the provided
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cacerts file
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"""
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if sys.platform != 'darwin' or util.mainfrozen() or not sys.executable:
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return False
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exe = os.path.realpath(sys.executable).lower()
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return (exe.startswith('/usr/bin/python') or
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exe.startswith('/system/library/frameworks/python.framework/'))
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def _defaultcacerts():
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"""return path to CA certificates; None for system's store; ! to disable"""
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if _plainapplepython():
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dummycert = os.path.join(os.path.dirname(__file__), 'dummycert.pem')
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if os.path.exists(dummycert):
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return dummycert
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if _canloaddefaultcerts:
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return None
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return '!'
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def sslkwargs(ui, host):
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kws = {'ui': ui}
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hostfingerprint = ui.config('hostfingerprints', host)
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if hostfingerprint:
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return kws
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cacerts = ui.config('web', 'cacerts')
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if cacerts == '!':
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pass
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elif cacerts:
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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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else:
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cacerts = _defaultcacerts()
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if cacerts and cacerts != '!':
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ui.debug('using %s to enable OS X system CA\n' % cacerts)
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ui.setconfig('web', 'cacerts', cacerts, 'defaultcacerts')
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if cacerts != '!':
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kws.update({'ca_certs': cacerts,
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'cert_reqs': ssl.CERT_REQUIRED,
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})
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return kws
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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, strict=False):
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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 not sock.cipher(): # work around http://bugs.python.org/issue13721
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raise util.Abort(_('%s ssl connection error') % host)
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try:
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peercert = sock.getpeercert(True)
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peercert2 = sock.getpeercert()
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except AttributeError:
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raise util.Abort(_('%s ssl connection error') % host)
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if not peercert:
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raise util.Abort(_('%s certificate error: '
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'no certificate received') % host)
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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(_('certificate for %s has unexpected '
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'fingerprint %s') % (host, nicefingerprint),
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hint=_('check hostfingerprint configuration'))
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self.ui.debug('%s certificate matched fingerprint %s\n' %
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(host, nicefingerprint))
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elif cacerts != '!':
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msg = _verifycert(peercert2, host)
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if msg:
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raise util.Abort(_('%s certificate error: %s') % (host, msg),
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hint=_('configure hostfingerprint %s or use '
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'--insecure to connect insecurely') %
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nicefingerprint)
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self.ui.debug('%s certificate successfully verified\n' % host)
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elif strict:
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raise util.Abort(_('%s certificate with fingerprint %s not '
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'verified') % (host, nicefingerprint),
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hint=_('check hostfingerprints or web.cacerts '
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'config setting'))
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else:
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self.ui.warn(_('warning: %s certificate with fingerprint %s not '
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'verified (check hostfingerprints or web.cacerts '
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'config setting)\n') %
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(host, nicefingerprint))
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