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# sslutil.py - SSL handling for mercurial
#
# Copyright 2005, 2006, 2007, 2008 Matt Mackall <mpm@selenic.com>
# Copyright 2006, 2007 Alexis S. L. Carvalho <alexis@cecm.usp.br>
# Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
import os
from mercurial import util
from mercurial.i18n import _
try:
# avoid using deprecated/broken FakeSocket in python 2.6
import ssl
ssl_wrap_socket = ssl.wrap_socket
CERT_REQUIRED = ssl.CERT_REQUIRED
except ImportError:
CERT_REQUIRED = 2
import socket, httplib
def ssl_wrap_socket(sock, key_file, cert_file,
cert_reqs=CERT_REQUIRED, ca_certs=None):
if ca_certs:
raise util.Abort(_(
'certificate checking requires Python 2.6'))
ssl = socket.ssl(sock, key_file, cert_file)
return httplib.FakeSocket(sock, ssl)
def _verifycert(cert, hostname):
'''Verify that cert (in socket.getpeercert() format) matches hostname.
CRLs is not handled.
Returns error message if any problems are found and None on success.
'''
if not cert:
return _('no certificate received')
dnsname = hostname.lower()
def matchdnsname(certname):
return (certname == dnsname or
'.' in dnsname and certname == '*.' + dnsname.split('.', 1)[1])
san = cert.get('subjectAltName', [])
if san:
certnames = [value.lower() for key, value in san if key == 'DNS']
for name in certnames:
if matchdnsname(name):
return None
if certnames:
return _('certificate is for %s') % ', '.join(certnames)
# subject is only checked when subjectAltName is empty
for s in cert.get('subject', []):
key, value = s[0]
if key == 'commonName':
try:
# 'subject' entries are unicode
certname = value.lower().encode('ascii')
except UnicodeEncodeError:
return _('IDN in certificate not supported')
if matchdnsname(certname):
return None
return _('certificate is for %s') % certname
return _('no commonName or subjectAltName found in certificate')
# CERT_REQUIRED means fetch the cert from the server all the time AND
# validate it against the CA store provided in web.cacerts.
#
# We COMPLETELY ignore CERT_REQUIRED on Python <= 2.5, as it's totally
# busted on those versions.
def sslkwargs(ui, host):
cacerts = ui.config('web', 'cacerts')
hostfingerprint = ui.config('hostfingerprints', host)
if cacerts and not hostfingerprint:
cacerts = util.expandpath(cacerts)
if not os.path.exists(cacerts):
raise util.Abort(_('could not find web.cacerts: %s') % cacerts)
return {'ca_certs': cacerts,
'cert_reqs': CERT_REQUIRED,
}
return {}
class validator(object):
def __init__(self, ui, host):
self.ui = ui
self.host = host
def __call__(self, sock):
host = self.host
cacerts = self.ui.config('web', 'cacerts')
hostfingerprint = self.ui.config('hostfingerprints', host)
if cacerts and not hostfingerprint:
msg = _verifycert(sock.getpeercert(), host)
if msg:
raise util.Abort(_('%s certificate error: %s '
'(use --insecure to connect '
'insecurely)') % (host, msg))
self.ui.debug('%s certificate successfully verified\n' % host)
else:
if getattr(sock, 'getpeercert', False):
peercert = sock.getpeercert(True)
peerfingerprint = util.sha1(peercert).hexdigest()
nicefingerprint = ":".join([peerfingerprint[x:x + 2]
for x in xrange(0, len(peerfingerprint), 2)])
if hostfingerprint:
if peerfingerprint.lower() != \
hostfingerprint.replace(':', '').lower():
raise util.Abort(_('invalid certificate for %s '
'with fingerprint %s') %
(host, nicefingerprint))
self.ui.debug('%s certificate matched fingerprint %s\n' %
(host, nicefingerprint))
else:
self.ui.warn(_('warning: %s certificate '
'with fingerprint %s not verified '
'(check hostfingerprints or web.cacerts '
'config setting)\n') %
(host, nicefingerprint))
else: # python 2.5 ?
if hostfingerprint:
raise util.Abort(_("host fingerprint for %s can't be "
"verified (Python too old)") % host)
self.ui.warn(_("warning: certificate for %s can't be "
"verified (Python too old)\n") % host)
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