Mercurial > hg
view mercurial/sslutil.py @ 26189:663fbc336e22
ui: change default path fallback mechanism (issue4796)
The previous paths API code always fell back to the default path. This
was wrong because if a requested path doesn't exist, that should error.
Only if no path was requested should we fall back to the default.
As part of implementing the test case for issue 4796, it was discovered
that the "repository does not exist" error message raised by
localrepository.__init__ wasn't being seen because the paths API
validates paths before localrepository.__init__ was being called.
The exception and error message from localrepository.__init__ has
been introduced to getpath(). This necessitated rewriting
expandpath() both to catch the exception and to have proper
default fallback.
This code is more complicated than I'd like. But making all tests pass
was a big chore. As more code moves to getpath(), there will likely be
opportunities to improve things a bit.
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Sun, 06 Sep 2015 11:28:48 -0700 |
parents | 696f6e2be282 |
children | 56b2bcea2529 |
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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. from __future__ import absolute_import import os import ssl import sys from .i18n import _ from . import util _canloaddefaultcerts = False try: ssl_context = ssl.SSLContext _canloaddefaultcerts = util.safehasattr(ssl_context, 'load_default_certs') def wrapsocket(sock, keyfile, certfile, ui, cert_reqs=ssl.CERT_NONE, ca_certs=None, serverhostname=None): # Allow any version of SSL starting with TLSv1 and # up. Note that specifying TLSv1 here prohibits use of # newer standards (like TLSv1_2), so this is the right way # to do this. Note that in the future it'd be better to # support using ssl.create_default_context(), which sets # up a bunch of things in smart ways (strong ciphers, # protocol versions, etc) and is upgraded by Python # maintainers for us, but that breaks too many things to # do it in a hurry. sslcontext = ssl.SSLContext(ssl.PROTOCOL_SSLv23) sslcontext.options &= ssl.OP_NO_SSLv2 & ssl.OP_NO_SSLv3 if certfile is not None: def password(): f = keyfile or certfile return ui.getpass(_('passphrase for %s: ') % f, '') sslcontext.load_cert_chain(certfile, keyfile, password) sslcontext.verify_mode = cert_reqs if ca_certs is not None: sslcontext.load_verify_locations(cafile=ca_certs) elif _canloaddefaultcerts: sslcontext.load_default_certs() sslsocket = sslcontext.wrap_socket(sock, server_hostname=serverhostname) # 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 AttributeError: def wrapsocket(sock, keyfile, certfile, ui, cert_reqs=ssl.CERT_NONE, ca_certs=None, serverhostname=None): sslsocket = ssl.wrap_socket(sock, keyfile, certfile, cert_reqs=cert_reqs, ca_certs=ca_certs, ssl_version=ssl.PROTOCOL_TLSv1) # 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 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. def _plainapplepython(): """return true if this seems to be a pure Apple Python that * is unfrozen and presumably has the whole mercurial module in the file system * presumably is an Apple Python that uses Apple OpenSSL which has patches for using system certificate store CAs in addition to the provided cacerts file """ if sys.platform != 'darwin' or util.mainfrozen() or not sys.executable: return False exe = os.path.realpath(sys.executable).lower() return (exe.startswith('/usr/bin/python') or exe.startswith('/system/library/frameworks/python.framework/')) def _defaultcacerts(): """return path to CA certificates; None for system's store; ! to disable""" if _plainapplepython(): dummycert = os.path.join(os.path.dirname(__file__), 'dummycert.pem') if os.path.exists(dummycert): return dummycert if _canloaddefaultcerts: return None return '!' def sslkwargs(ui, host): kws = {'ui': ui} hostfingerprint = ui.config('hostfingerprints', host) if hostfingerprint: return kws cacerts = ui.config('web', 'cacerts') if cacerts == '!': pass elif cacerts: cacerts = util.expandpath(cacerts) if not os.path.exists(cacerts): raise util.Abort(_('could not find web.cacerts: %s') % cacerts) else: cacerts = _defaultcacerts() if cacerts and cacerts != '!': ui.debug('using %s to enable OS X system CA\n' % cacerts) ui.setconfig('web', 'cacerts', cacerts, 'defaultcacerts') if cacerts != '!': kws.update({'ca_certs': cacerts, 'cert_reqs': ssl.CERT_REQUIRED, }) return kws 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 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))