obsolete: extract obsolescence marker pulling into a dedicated function
Having a dedicated function will allow us to experiment with other exchange
strategies in an extension. As we have no solid clues about how to do it right,
being able to experiment is vital.
Some transaction tricks are necessary for pull. But nothing too scary.
# 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
CERT_REQUIRED = ssl.CERT_REQUIRED
def ssl_wrap_socket(sock, keyfile, certfile,
cert_reqs=ssl.CERT_NONE, ca_certs=None):
sslsocket = ssl.wrap_socket(sock, keyfile, certfile,
cert_reqs=cert_reqs, ca_certs=ca_certs)
# check if wrap_socket failed silently because socket had been closed
# - see http://bugs.python.org/issue13721
if not sslsocket.cipher():
raise util.Abort(_('ssl connection failed'))
return sslsocket
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 not util.safehasattr(socket, 'ssl'):
raise util.Abort(_('Python SSL support not found'))
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, strict=False):
host = self.host
cacerts = self.ui.config('web', 'cacerts')
hostfingerprint = self.ui.config('hostfingerprints', host)
if not getattr(sock, 'getpeercert', False): # python 2.5 ?
if hostfingerprint:
raise util.Abort(_("host fingerprint for %s can't be "
"verified (Python too old)") % host)
if strict:
raise util.Abort(_("certificate for %s can't be verified "
"(Python too old)") % host)
if self.ui.configbool('ui', 'reportoldssl', True):
self.ui.warn(_("warning: certificate for %s can't be verified "
"(Python too old)\n") % host)
return
if not sock.cipher(): # work around http://bugs.python.org/issue13721
raise util.Abort(_('%s ssl connection error') % host)
try:
peercert = sock.getpeercert(True)
peercert2 = sock.getpeercert()
except AttributeError:
raise util.Abort(_('%s ssl connection error') % host)
if not peercert:
raise util.Abort(_('%s certificate error: '
'no certificate received') % host)
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(_('certificate for %s has unexpected '
'fingerprint %s') % (host, nicefingerprint),
hint=_('check hostfingerprint configuration'))
self.ui.debug('%s certificate matched fingerprint %s\n' %
(host, nicefingerprint))
elif cacerts:
msg = _verifycert(peercert2, host)
if msg:
raise util.Abort(_('%s certificate error: %s') % (host, msg),
hint=_('configure hostfingerprint %s or use '
'--insecure to connect insecurely') %
nicefingerprint)
self.ui.debug('%s certificate successfully verified\n' % host)
elif strict:
raise util.Abort(_('%s certificate with fingerprint %s not '
'verified') % (host, nicefingerprint),
hint=_('check hostfingerprints or web.cacerts '
'config setting'))
else:
self.ui.warn(_('warning: %s certificate with fingerprint %s not '
'verified (check hostfingerprints or web.cacerts '
'config setting)\n') %
(host, nicefingerprint))