view mercurial/sslutil.py @ 15711:c51c9dc13a58

cygwin: add cygwin specific normcase logic

in cygwin environment, mount point part of path is treated as case
sensitive, even though underlying NTFS is case insensitive.

this patch preserves mount point part of specified path, only if it is
absolute one.

there is no easy way to get list of current mount points from python
program, other than to execute "mount" external command, because
cygwin does not store current mount points into Unix/Linux like
/etc/XXXtab file.

so, this patch introduces cygwinmountpoints variable to list mount
points to be preserved case.

this allows some other extensions to customize mount point
configuration.

# sslutil.py - SSL handling for mercurial
#
# Copyright 2005, 2006, 2007, 2008 Matt Mackall <[e-mail]>
# Copyright 2006, 2007 Alexis S. L. Carvalho <[e-mail]>
# Copyright 2006 Vadim Gelfer <[e-mail]>
#
# 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 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):
        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)