sslutil: remove dead code (that downgraded default minimum TLS version)

We ensure in setup.py that TLS 1.1 or TLS 1.2 is present.

mercurial/sslutil.py

@@ -1,873 +1,860 b''
 # 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.
 
 from __future__ import absolute_import
 
 import hashlib
 import os
 import re
 import ssl
 
 from .i18n import _
 from .pycompat import getattr
 from . import (
     encoding,
     error,
     node,
     pycompat,
     util,
 )
 from .utils import (
     hashutil,
     resourceutil,
     stringutil,
 )
 
 # Python 2.7.9+ overhauled the built-in SSL/TLS features of Python. It added
 # support for TLS 1.1, TLS 1.2, SNI, system CA stores, etc. These features are
 # all exposed via the "ssl" module.
 #
 # We require in setup.py the presence of ssl.SSLContext, which indicates modern
 # SSL/TLS support.
 
 configprotocols = {
     b'tls1.0',
     b'tls1.1',
     b'tls1.2',
 }
 
 hassni = getattr(ssl, 'HAS_SNI', False)
 
 # TLS 1.1 and 1.2 may not be supported if the OpenSSL Python is compiled
 # against doesn't support them.
 # FIXME: Since CPython commit 6e8cda91d92da72800d891b2fc2073ecbc134d98
 # individual TLS versions can be turned on and off, and the
 # ssl.PROTOCOL_TLSv1_* constants are always defined.
 # This means that, on unusual configurations, the following dict may contain
 # too many entries. A proper fix would be to check ssl.HAS_TLSv* where
 # available (Python 3.7+). Before that, this module should be proofed against
 # all possible combinations.
 supportedprotocols = {b'tls1.0'}
 if util.safehasattr(ssl, b'PROTOCOL_TLSv1_1'):
     supportedprotocols.add(b'tls1.1')
 if util.safehasattr(ssl, b'PROTOCOL_TLSv1_2'):
     supportedprotocols.add(b'tls1.2')
 
 
 def _hostsettings(ui, hostname):
     """Obtain security settings for a hostname.
 
     Returns a dict of settings relevant to that hostname.
     """
     bhostname = pycompat.bytesurl(hostname)
     s = {
         # Whether we should attempt to load default/available CA certs
         # if an explicit ``cafile`` is not defined.
         b'allowloaddefaultcerts': True,
         # List of 2-tuple of (hash algorithm, hash).
         b'certfingerprints': [],
         # Path to file containing concatenated CA certs. Used by
         # SSLContext.load_verify_locations().
         b'cafile': None,
         # Whether certificate verification should be disabled.
         b'disablecertverification': False,
         # Whether the legacy [hostfingerprints] section has data for this host.
         b'legacyfingerprint': False,
         # PROTOCOL_* constant to use for SSLContext.__init__.
         b'protocol': None,
         # String representation of minimum protocol to be used for UI
         # presentation.
         b'minimumprotocolui': None,
         # ssl.CERT_* constant used by SSLContext.verify_mode.
         b'verifymode': None,
         # Defines extra ssl.OP* bitwise options to set.
         b'ctxoptions': None,
         # OpenSSL Cipher List to use (instead of default).
         b'ciphers': None,
     }
 
     # Allow minimum TLS protocol to be specified in the config.
     def validateprotocol(protocol, key):
         if protocol not in configprotocols:
             raise error.Abort(
                 _(b'unsupported protocol from hostsecurity.%s: %s')
                 % (key, protocol),
                 hint=_(b'valid protocols: %s')
                 % b' '.join(sorted(configprotocols)),
             )
 
-    # We default to TLS 1.1+ where we can because TLS 1.0 has known
-    # vulnerabilities (like BEAST and POODLE). We allow users to downgrade to
-    # TLS 1.0+ via config options in case a legacy server is encountered.
-    if supportedprotocols - {b'tls1.0'}:
-        defaultminimumprotocol = b'tls1.1'
-    else:
-        # Let people know they are borderline secure.
-        # We don't document this config option because we want people to see
-        # the bold warnings on the web site.
-        # internal config: hostsecurity.disabletls10warning
-        if not ui.configbool(b'hostsecurity', b'disabletls10warning'):
-            ui.warn(
-                _(
-                    b'warning: connecting to %s using legacy security '
-                    b'technology (TLS 1.0); see '
-                    b'https://mercurial-scm.org/wiki/SecureConnections for '
-                    b'more info\n'
-                )
-                % bhostname
-            )
-        defaultminimumprotocol = b'tls1.0'
+    # We default to TLS 1.1+ because TLS 1.0 has known vulnerabilities (like
+    # BEAST and POODLE). We allow users to downgrade to TLS 1.0+ via config
+    # options in case a legacy server is encountered.
+
+    # setup.py checks that either TLS 1.1 or TLS 1.2 is present, so the
+    # following assert should not fail.
+    assert supportedprotocols - {b'tls1.0'}
+    defaultminimumprotocol = b'tls1.1'
 
     key = b'minimumprotocol'
     minimumprotocol = ui.config(b'hostsecurity', key, defaultminimumprotocol)
     validateprotocol(minimumprotocol, key)
 
     key = b'%s:minimumprotocol' % bhostname
     minimumprotocol = ui.config(b'hostsecurity', key, minimumprotocol)
     validateprotocol(minimumprotocol, key)
 
     # If --insecure is used, we allow the use of TLS 1.0 despite config options.
     # We always print a "connection security to %s is disabled..." message when
     # --insecure is used. So no need to print anything more here.
     if ui.insecureconnections:
         minimumprotocol = b'tls1.0'
 
     s[b'minimumprotocolui'] = minimumprotocol
     s[b'protocol'], s[b'ctxoptions'] = protocolsettings(minimumprotocol)
 
     ciphers = ui.config(b'hostsecurity', b'ciphers')
     ciphers = ui.config(b'hostsecurity', b'%s:ciphers' % bhostname, ciphers)
     s[b'ciphers'] = ciphers
 
     # Look for fingerprints in [hostsecurity] section. Value is a list
     # of <alg>:<fingerprint> strings.
     fingerprints = ui.configlist(
         b'hostsecurity', b'%s:fingerprints' % bhostname
     )
     for fingerprint in fingerprints:
         if not (fingerprint.startswith((b'sha1:', b'sha256:', b'sha512:'))):
             raise error.Abort(
                 _(b'invalid fingerprint for %s: %s') % (bhostname, fingerprint),
                 hint=_(b'must begin with "sha1:", "sha256:", or "sha512:"'),
             )
 
         alg, fingerprint = fingerprint.split(b':', 1)
         fingerprint = fingerprint.replace(b':', b'').lower()
         s[b'certfingerprints'].append((alg, fingerprint))
 
     # Fingerprints from [hostfingerprints] are always SHA-1.
     for fingerprint in ui.configlist(b'hostfingerprints', bhostname):
         fingerprint = fingerprint.replace(b':', b'').lower()
         s[b'certfingerprints'].append((b'sha1', fingerprint))
         s[b'legacyfingerprint'] = True
 
     # If a host cert fingerprint is defined, it is the only thing that
     # matters. No need to validate CA certs.
     if s[b'certfingerprints']:
         s[b'verifymode'] = ssl.CERT_NONE
         s[b'allowloaddefaultcerts'] = False
 
     # If --insecure is used, don't take CAs into consideration.
     elif ui.insecureconnections:
         s[b'disablecertverification'] = True
         s[b'verifymode'] = ssl.CERT_NONE
         s[b'allowloaddefaultcerts'] = False
 
     if ui.configbool(b'devel', b'disableloaddefaultcerts'):
         s[b'allowloaddefaultcerts'] = False
 
     # If both fingerprints and a per-host ca file are specified, issue a warning
     # because users should not be surprised about what security is or isn't
     # being performed.
     cafile = ui.config(b'hostsecurity', b'%s:verifycertsfile' % bhostname)
     if s[b'certfingerprints'] and cafile:
         ui.warn(
             _(
                 b'(hostsecurity.%s:verifycertsfile ignored when host '
                 b'fingerprints defined; using host fingerprints for '
                 b'verification)\n'
             )
             % bhostname
         )
 
     # Try to hook up CA certificate validation unless something above
     # makes it not necessary.
     if s[b'verifymode'] is None:
         # Look at per-host ca file first.
         if cafile:
             cafile = util.expandpath(cafile)
             if not os.path.exists(cafile):
                 raise error.Abort(
                     _(b'path specified by %s does not exist: %s')
                     % (
                         b'hostsecurity.%s:verifycertsfile' % (bhostname,),
                         cafile,
                     )
                 )
             s[b'cafile'] = cafile
         else:
             # Find global certificates file in config.
             cafile = ui.config(b'web', b'cacerts')
 
             if cafile:
                 cafile = util.expandpath(cafile)
                 if not os.path.exists(cafile):
                     raise error.Abort(
                         _(b'could not find web.cacerts: %s') % cafile
                     )
             elif s[b'allowloaddefaultcerts']:
                 # CAs not defined in config. Try to find system bundles.
                 cafile = _defaultcacerts(ui)
                 if cafile:
                     ui.debug(b'using %s for CA file\n' % cafile)
 
             s[b'cafile'] = cafile
 
         # Require certificate validation if CA certs are being loaded and
         # verification hasn't been disabled above.
         if cafile or s[b'allowloaddefaultcerts']:
             s[b'verifymode'] = ssl.CERT_REQUIRED
         else:
             # At this point we don't have a fingerprint, aren't being
             # explicitly insecure, and can't load CA certs. Connecting
             # is insecure. We allow the connection and abort during
             # validation (once we have the fingerprint to print to the
             # user).
             s[b'verifymode'] = ssl.CERT_NONE
 
     assert s[b'protocol'] is not None
     assert s[b'ctxoptions'] is not None
     assert s[b'verifymode'] is not None
 
     return s
 
 
 def protocolsettings(minimumprotocol):
     """Resolve the protocol for a config value.
 
     Returns a tuple of (protocol, options) which are values used by SSLContext.
     """
     if minimumprotocol not in configprotocols:
         raise ValueError(b'protocol value not supported: %s' % minimumprotocol)
 
     # Despite its name, PROTOCOL_SSLv23 selects the highest protocol
     # that both ends support, including TLS protocols.
     #
     # The PROTOCOL_TLSv* constants select a specific TLS version
     # only (as opposed to multiple versions). So the method for
     # supporting multiple TLS versions is to use PROTOCOL_SSLv23 and
     # disable protocols via SSLContext.options and OP_NO_* constants.
     if supportedprotocols == {b'tls1.0'}:
         if minimumprotocol != b'tls1.0':
             raise error.Abort(
                 _(b'current Python does not support protocol setting %s')
                 % minimumprotocol,
                 hint=_(
                     b'upgrade Python or disable setting since '
                     b'only TLS 1.0 is supported'
                 ),
             )
 
         return ssl.PROTOCOL_TLSv1, 0
 
     # SSLv2 and SSLv3 are broken. We ban them outright.
     options = ssl.OP_NO_SSLv2 | ssl.OP_NO_SSLv3
 
     if minimumprotocol == b'tls1.0':
         # Defaults above are to use TLS 1.0+
         pass
     elif minimumprotocol == b'tls1.1':
         options |= ssl.OP_NO_TLSv1
     elif minimumprotocol == b'tls1.2':
         options |= ssl.OP_NO_TLSv1 | ssl.OP_NO_TLSv1_1
     else:
         raise error.Abort(_(b'this should not happen'))
 
     # Prevent CRIME.
     # There is no guarantee this attribute is defined on the module.
     options |= getattr(ssl, 'OP_NO_COMPRESSION', 0)
 
     return ssl.PROTOCOL_SSLv23, options
 
 
 def wrapsocket(sock, keyfile, certfile, ui, serverhostname=None):
     """Add SSL/TLS to a socket.
 
     This is a glorified wrapper for ``ssl.wrap_socket()``. It makes sane
     choices based on what security options are available.
 
     In addition to the arguments supported by ``ssl.wrap_socket``, we allow
     the following additional arguments:
 
     * serverhostname - The expected hostname of the remote server. If the
       server (and client) support SNI, this tells the server which certificate
       to use.
     """
     if not serverhostname:
         raise error.Abort(_(b'serverhostname argument is required'))
 
     if b'SSLKEYLOGFILE' in encoding.environ:
         try:
             import sslkeylog
 
             sslkeylog.set_keylog(
                 pycompat.fsdecode(encoding.environ[b'SSLKEYLOGFILE'])
             )
             ui.warnnoi18n(
                 b'sslkeylog enabled by SSLKEYLOGFILE environment variable\n'
             )
         except ImportError:
             ui.warnnoi18n(
                 b'sslkeylog module missing, '
                 b'but SSLKEYLOGFILE set in environment\n'
             )
 
     for f in (keyfile, certfile):
         if f and not os.path.exists(f):
             raise error.Abort(
                 _(b'certificate file (%s) does not exist; cannot connect to %s')
                 % (f, pycompat.bytesurl(serverhostname)),
                 hint=_(
                     b'restore missing file or fix references '
                     b'in Mercurial config'
                 ),
             )
 
     settings = _hostsettings(ui, serverhostname)
 
     # We can't use ssl.create_default_context() because it calls
     # load_default_certs() unless CA arguments are passed to it. We want to
     # have explicit control over CA loading because implicitly loading
     # CAs may undermine the user's intent. For example, a user may define a CA
     # bundle with a specific CA cert removed. If the system/default CA bundle
     # is loaded and contains that removed CA, you've just undone the user's
     # choice.
     sslcontext = ssl.SSLContext(settings[b'protocol'])
     sslcontext.options |= settings[b'ctxoptions']
     sslcontext.verify_mode = settings[b'verifymode']
 
     if settings[b'ciphers']:
         try:
             sslcontext.set_ciphers(pycompat.sysstr(settings[b'ciphers']))
         except ssl.SSLError as e:
             raise error.Abort(
                 _(b'could not set ciphers: %s')
                 % stringutil.forcebytestr(e.args[0]),
                 hint=_(b'change cipher string (%s) in config')
                 % settings[b'ciphers'],
             )
 
     if certfile is not None:
 
         def password():
             f = keyfile or certfile
             return ui.getpass(_(b'passphrase for %s: ') % f, b'')
 
         sslcontext.load_cert_chain(certfile, keyfile, password)
 
     if settings[b'cafile'] is not None:
         try:
             sslcontext.load_verify_locations(cafile=settings[b'cafile'])
         except ssl.SSLError as e:
             if len(e.args) == 1:  # pypy has different SSLError args
                 msg = e.args[0]
             else:
                 msg = e.args[1]
             raise error.Abort(
                 _(b'error loading CA file %s: %s')
                 % (settings[b'cafile'], stringutil.forcebytestr(msg)),
                 hint=_(b'file is empty or malformed?'),
             )
         caloaded = True
     elif settings[b'allowloaddefaultcerts']:
         # This is a no-op on old Python.
         sslcontext.load_default_certs()
         caloaded = True
     else:
         caloaded = False
 
     try:
         sslsocket = sslcontext.wrap_socket(sock, server_hostname=serverhostname)
     except ssl.SSLError as e:
         # If we're doing certificate verification and no CA certs are loaded,
         # that is almost certainly the reason why verification failed. Provide
         # a hint to the user.
         # The exception handler is here to handle bugs around cert attributes:
         # https://bugs.python.org/issue20916#msg213479.  (See issues5313.)
         # When the main 20916 bug occurs, 'sslcontext.get_ca_certs()' is a
         # non-empty list, but the following conditional is otherwise True.
         try:
             if (
                 caloaded
                 and settings[b'verifymode'] == ssl.CERT_REQUIRED
                 and not sslcontext.get_ca_certs()
             ):
                 ui.warn(
                     _(
                         b'(an attempt was made to load CA certificates but '
                         b'none were loaded; see '
                         b'https://mercurial-scm.org/wiki/SecureConnections '
                         b'for how to configure Mercurial to avoid this '
                         b'error)\n'
                     )
                 )
         except ssl.SSLError:
             pass
 
         # Try to print more helpful error messages for known failures.
         if util.safehasattr(e, b'reason'):
             # This error occurs when the client and server don't share a
             # common/supported SSL/TLS protocol. We've disabled SSLv2 and SSLv3
             # outright. Hopefully the reason for this error is that we require
             # TLS 1.1+ and the server only supports TLS 1.0. Whatever the
             # reason, try to emit an actionable warning.
             if e.reason == 'UNSUPPORTED_PROTOCOL':
                 # We attempted TLS 1.0+.
                 if settings[b'minimumprotocolui'] == b'tls1.0':
                     # We support more than just TLS 1.0+. If this happens,
                     # the likely scenario is either the client or the server
                     # is really old. (e.g. server doesn't support TLS 1.0+ or
                     # client doesn't support modern TLS versions introduced
                     # several years from when this comment was written).
                     if supportedprotocols != {b'tls1.0'}:
                         ui.warn(
                             _(
                                 b'(could not communicate with %s using security '
                                 b'protocols %s; if you are using a modern Mercurial '
                                 b'version, consider contacting the operator of this '
                                 b'server; see '
                                 b'https://mercurial-scm.org/wiki/SecureConnections '
                                 b'for more info)\n'
                             )
                             % (
                                 pycompat.bytesurl(serverhostname),
                                 b', '.join(sorted(supportedprotocols)),
                             )
                         )
                     else:
                         ui.warn(
                             _(
                                 b'(could not communicate with %s using TLS 1.0; the '
                                 b'likely cause of this is the server no longer '
                                 b'supports TLS 1.0 because it has known security '
                                 b'vulnerabilities; see '
                                 b'https://mercurial-scm.org/wiki/SecureConnections '
                                 b'for more info)\n'
                             )
                             % pycompat.bytesurl(serverhostname)
                         )
                 else:
                     # We attempted TLS 1.1+. We can only get here if the client
                     # supports the configured protocol. So the likely reason is
                     # the client wants better security than the server can
                     # offer.
                     ui.warn(
                         _(
                             b'(could not negotiate a common security protocol (%s+) '
                             b'with %s; the likely cause is Mercurial is configured '
                             b'to be more secure than the server can support)\n'
                         )
                         % (
                             settings[b'minimumprotocolui'],
                             pycompat.bytesurl(serverhostname),
                         )
                     )
                     ui.warn(
                         _(
                             b'(consider contacting the operator of this '
                             b'server and ask them to support modern TLS '
                             b'protocol versions; or, set '
                             b'hostsecurity.%s:minimumprotocol=tls1.0 to allow '
                             b'use of legacy, less secure protocols when '
                             b'communicating with this server)\n'
                         )
                         % pycompat.bytesurl(serverhostname)
                     )
                     ui.warn(
                         _(
                             b'(see https://mercurial-scm.org/wiki/SecureConnections '
                             b'for more info)\n'
                         )
                     )
 
             elif e.reason == 'CERTIFICATE_VERIFY_FAILED' and pycompat.iswindows:
 
                 ui.warn(
                     _(
                         b'(the full certificate chain may not be available '
                         b'locally; see "hg help debugssl")\n'
                     )
                 )
         raise
 
     # check if wrap_socket failed silently because socket had been
     # closed
     # - see http://bugs.python.org/issue13721
     if not sslsocket.cipher():
         raise error.Abort(_(b'ssl connection failed'))
 
     sslsocket._hgstate = {
         b'caloaded': caloaded,
         b'hostname': serverhostname,
         b'settings': settings,
         b'ui': ui,
     }
 
     return sslsocket
 
 
 def wrapserversocket(
     sock, ui, certfile=None, keyfile=None, cafile=None, requireclientcert=False
 ):
     """Wrap a socket for use by servers.
 
     ``certfile`` and ``keyfile`` specify the files containing the certificate's
     public and private keys, respectively. Both keys can be defined in the same
     file via ``certfile`` (the private key must come first in the file).
 
     ``cafile`` defines the path to certificate authorities.
 
     ``requireclientcert`` specifies whether to require client certificates.
 
     Typically ``cafile`` is only defined if ``requireclientcert`` is true.
     """
     # This function is not used much by core Mercurial, so the error messaging
     # doesn't have to be as detailed as for wrapsocket().
     for f in (certfile, keyfile, cafile):
         if f and not os.path.exists(f):
             raise error.Abort(
                 _(b'referenced certificate file (%s) does not exist') % f
             )
 
     protocol, options = protocolsettings(b'tls1.0')
 
     # This config option is intended for use in tests only. It is a giant
     # footgun to kill security. Don't define it.
     exactprotocol = ui.config(b'devel', b'serverexactprotocol')
     if exactprotocol == b'tls1.0':
         if b'tls1.0' not in supportedprotocols:
             raise error.Abort(_(b'TLS 1.0 not supported by this Python'))
         protocol = ssl.PROTOCOL_TLSv1
     elif exactprotocol == b'tls1.1':
         if b'tls1.1' not in supportedprotocols:
             raise error.Abort(_(b'TLS 1.1 not supported by this Python'))
         protocol = ssl.PROTOCOL_TLSv1_1
     elif exactprotocol == b'tls1.2':
         if b'tls1.2' not in supportedprotocols:
             raise error.Abort(_(b'TLS 1.2 not supported by this Python'))
         protocol = ssl.PROTOCOL_TLSv1_2
     elif exactprotocol:
         raise error.Abort(
             _(b'invalid value for serverexactprotocol: %s') % exactprotocol
         )
 
     # We /could/ use create_default_context() here since it doesn't load
     # CAs when configured for client auth. However, it is hard-coded to
     # use ssl.PROTOCOL_SSLv23 which may not be appropriate here.
     sslcontext = ssl.SSLContext(protocol)
     sslcontext.options |= options
 
     # Improve forward secrecy.
     sslcontext.options |= getattr(ssl, 'OP_SINGLE_DH_USE', 0)
     sslcontext.options |= getattr(ssl, 'OP_SINGLE_ECDH_USE', 0)
 
     # Use the list of more secure ciphers if found in the ssl module.
     if util.safehasattr(ssl, b'_RESTRICTED_SERVER_CIPHERS'):
         sslcontext.options |= getattr(ssl, 'OP_CIPHER_SERVER_PREFERENCE', 0)
         sslcontext.set_ciphers(ssl._RESTRICTED_SERVER_CIPHERS)
 
     if requireclientcert:
         sslcontext.verify_mode = ssl.CERT_REQUIRED
     else:
         sslcontext.verify_mode = ssl.CERT_NONE
 
     if certfile or keyfile:
         sslcontext.load_cert_chain(certfile=certfile, keyfile=keyfile)
 
     if cafile:
         sslcontext.load_verify_locations(cafile=cafile)
 
     return sslcontext.wrap_socket(sock, server_side=True)
 
 
 class wildcarderror(Exception):
     """Represents an error parsing wildcards in DNS name."""
 
 
 def _dnsnamematch(dn, hostname, maxwildcards=1):
     """Match DNS names according RFC 6125 section 6.4.3.
 
     This code is effectively copied from CPython's ssl._dnsname_match.
 
     Returns a bool indicating whether the expected hostname matches
     the value in ``dn``.
     """
     pats = []
     if not dn:
         return False
     dn = pycompat.bytesurl(dn)
     hostname = pycompat.bytesurl(hostname)
 
     pieces = dn.split(b'.')
     leftmost = pieces[0]
     remainder = pieces[1:]
     wildcards = leftmost.count(b'*')
     if wildcards > maxwildcards:
         raise wildcarderror(
             _(b'too many wildcards in certificate DNS name: %s') % dn
         )
 
     # speed up common case w/o wildcards
     if not wildcards:
         return dn.lower() == hostname.lower()
 
     # RFC 6125, section 6.4.3, subitem 1.
     # The client SHOULD NOT attempt to match a presented identifier in which
     # the wildcard character comprises a label other than the left-most label.
     if leftmost == b'*':
         # When '*' is a fragment by itself, it matches a non-empty dotless
         # fragment.
         pats.append(b'[^.]+')
     elif leftmost.startswith(b'xn--') or hostname.startswith(b'xn--'):
         # RFC 6125, section 6.4.3, subitem 3.
         # The client SHOULD NOT attempt to match a presented identifier
         # where the wildcard character is embedded within an A-label or
         # U-label of an internationalized domain name.
         pats.append(stringutil.reescape(leftmost))
     else:
         # Otherwise, '*' matches any dotless string, e.g. www*
         pats.append(stringutil.reescape(leftmost).replace(br'\*', b'[^.]*'))
 
     # add the remaining fragments, ignore any wildcards
     for frag in remainder:
         pats.append(stringutil.reescape(frag))
 
     pat = re.compile(br'\A' + br'\.'.join(pats) + br'\Z', re.IGNORECASE)
     return pat.match(hostname) is not None
 
 
 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 _(b'no certificate received')
 
     dnsnames = []
     san = cert.get('subjectAltName', [])
     for key, value in san:
         if key == 'DNS':
             try:
                 if _dnsnamematch(value, hostname):
                     return
             except wildcarderror as e:
                 return stringutil.forcebytestr(e.args[0])
 
             dnsnames.append(value)
 
     if not dnsnames:
         # The subject is only checked when there is no DNS in subjectAltName.
         for sub in cert.get('subject', []):
             for key, value in sub:
                 # According to RFC 2818 the most specific Common Name must
                 # be used.
                 if key == 'commonName':
                     # 'subject' entries are unicode.
                     try:
                         value = value.encode('ascii')
                     except UnicodeEncodeError:
                         return _(b'IDN in certificate not supported')
 
                     try:
                         if _dnsnamematch(value, hostname):
                             return
                     except wildcarderror as e:
                         return stringutil.forcebytestr(e.args[0])
 
                     dnsnames.append(value)
 
     dnsnames = [pycompat.bytesurl(d) for d in dnsnames]
     if len(dnsnames) > 1:
         return _(b'certificate is for %s') % b', '.join(dnsnames)
     elif len(dnsnames) == 1:
         return _(b'certificate is for %s') % dnsnames[0]
     else:
         return _(b'no commonName or subjectAltName found in certificate')
 
 
 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 (
         not pycompat.isdarwin
         or resourceutil.mainfrozen()
         or not pycompat.sysexecutable
     ):
         return False
     exe = os.path.realpath(pycompat.sysexecutable).lower()
     return exe.startswith(b'/usr/bin/python') or exe.startswith(
         b'/system/library/frameworks/python.framework/'
     )
 
 
 def _defaultcacerts(ui):
     """return path to default CA certificates or None.
 
     It is assumed this function is called when the returned certificates
     file will actually be used to validate connections. Therefore this
     function may print warnings or debug messages assuming this usage.
 
     We don't print a message when the Python is able to load default
     CA certs because this scenario is detected at socket connect time.
     """
     # The "certifi" Python package provides certificates. If it is installed
     # and usable, assume the user intends it to be used and use it.
     try:
         import certifi
 
         certs = certifi.where()
         if os.path.exists(certs):
             ui.debug(b'using ca certificates from certifi\n')
             return pycompat.fsencode(certs)
     except (ImportError, AttributeError):
         pass
 
     # Apple's OpenSSL has patches that allow a specially constructed certificate
     # to load the system CA store. If we're running on Apple Python, use this
     # trick.
     if _plainapplepython():
         dummycert = os.path.join(
             os.path.dirname(pycompat.fsencode(__file__)), b'dummycert.pem'
         )
         if os.path.exists(dummycert):
             return dummycert
 
     return None
 
 
 def validatesocket(sock):
     """Validate a socket meets security requirements.
 
     The passed socket must have been created with ``wrapsocket()``.
     """
     shost = sock._hgstate[b'hostname']
     host = pycompat.bytesurl(shost)
     ui = sock._hgstate[b'ui']
     settings = sock._hgstate[b'settings']
 
     try:
         peercert = sock.getpeercert(True)
         peercert2 = sock.getpeercert()
     except AttributeError:
         raise error.Abort(_(b'%s ssl connection error') % host)
 
     if not peercert:
         raise error.Abort(
             _(b'%s certificate error: no certificate received') % host
         )
 
     if settings[b'disablecertverification']:
         # We don't print the certificate fingerprint because it shouldn't
         # be necessary: if the user requested certificate verification be
         # disabled, they presumably already saw a message about the inability
         # to verify the certificate and this message would have printed the
         # fingerprint. So printing the fingerprint here adds little to no
         # value.
         ui.warn(
             _(
                 b'warning: connection security to %s is disabled per current '
                 b'settings; communication is susceptible to eavesdropping '
                 b'and tampering\n'
             )
             % host
         )
         return
 
     # If a certificate fingerprint is pinned, use it and only it to
     # validate the remote cert.
     peerfingerprints = {
         b'sha1': node.hex(hashutil.sha1(peercert).digest()),
         b'sha256': node.hex(hashlib.sha256(peercert).digest()),
         b'sha512': node.hex(hashlib.sha512(peercert).digest()),
     }
 
     def fmtfingerprint(s):
         return b':'.join([s[x : x + 2] for x in range(0, len(s), 2)])
 
     nicefingerprint = b'sha256:%s' % fmtfingerprint(peerfingerprints[b'sha256'])
 
     if settings[b'certfingerprints']:
         for hash, fingerprint in settings[b'certfingerprints']:
             if peerfingerprints[hash].lower() == fingerprint:
                 ui.debug(
                     b'%s certificate matched fingerprint %s:%s\n'
                     % (host, hash, fmtfingerprint(fingerprint))
                 )
                 if settings[b'legacyfingerprint']:
                     ui.warn(
                         _(
                             b'(SHA-1 fingerprint for %s found in legacy '
                             b'[hostfingerprints] section; '
                             b'if you trust this fingerprint, remove the old '
                             b'SHA-1 fingerprint from [hostfingerprints] and '
                             b'add the following entry to the new '
                             b'[hostsecurity] section: %s:fingerprints=%s)\n'
                         )
                         % (host, host, nicefingerprint)
                     )
                 return
 
         # Pinned fingerprint didn't match. This is a fatal error.
         if settings[b'legacyfingerprint']:
             section = b'hostfingerprint'
             nice = fmtfingerprint(peerfingerprints[b'sha1'])
         else:
             section = b'hostsecurity'
             nice = b'%s:%s' % (hash, fmtfingerprint(peerfingerprints[hash]))
         raise error.Abort(
             _(b'certificate for %s has unexpected fingerprint %s')
             % (host, nice),
             hint=_(b'check %s configuration') % section,
         )
 
     # Security is enabled but no CAs are loaded. We can't establish trust
     # for the cert so abort.
     if not sock._hgstate[b'caloaded']:
         raise error.Abort(
             _(
                 b'unable to verify security of %s (no loaded CA certificates); '
                 b'refusing to connect'
             )
             % host,
             hint=_(
                 b'see https://mercurial-scm.org/wiki/SecureConnections for '
                 b'how to configure Mercurial to avoid this error or set '
                 b'hostsecurity.%s:fingerprints=%s to trust this server'
             )
             % (host, nicefingerprint),
         )
 
     msg = _verifycert(peercert2, shost)
     if msg:
         raise error.Abort(
             _(b'%s certificate error: %s') % (host, msg),
             hint=_(
                 b'set hostsecurity.%s:certfingerprints=%s '
                 b'config setting or use --insecure to connect '
                 b'insecurely'
             )
             % (host, nicefingerprint),
         )

tests/test-https.t

@@ -1,605 +1,560 b''
 #require serve ssl
 
 Proper https client requires the built-in ssl from Python 2.6.
 
 Disable the system configuration which may set stricter TLS requirements.
 This test expects that legacy TLS versions are supported.
 
   $ OPENSSL_CONF=
   $ export OPENSSL_CONF
 
 Make server certificates:
 
   $ CERTSDIR="$TESTDIR/sslcerts"
   $ cat "$CERTSDIR/priv.pem" "$CERTSDIR/pub.pem" >> server.pem
   $ PRIV=`pwd`/server.pem
   $ cat "$CERTSDIR/priv.pem" "$CERTSDIR/pub-not-yet.pem" > server-not-yet.pem
   $ cat "$CERTSDIR/priv.pem" "$CERTSDIR/pub-expired.pem" > server-expired.pem
 
   $ hg init test
   $ cd test
   $ echo foo>foo
   $ mkdir foo.d foo.d/bAr.hg.d foo.d/baR.d.hg
   $ echo foo>foo.d/foo
   $ echo bar>foo.d/bAr.hg.d/BaR
   $ echo bar>foo.d/baR.d.hg/bAR
   $ hg commit -A -m 1
   adding foo
   adding foo.d/bAr.hg.d/BaR
   adding foo.d/baR.d.hg/bAR
   adding foo.d/foo
   $ hg serve -p $HGPORT -d --pid-file=../hg0.pid --certificate=$PRIV
   $ cat ../hg0.pid >> $DAEMON_PIDS
 
 cacert not found
 
   $ hg in --config web.cacerts=no-such.pem https://localhost:$HGPORT/
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   abort: could not find web.cacerts: no-such.pem
   [255]
 
 Test server address cannot be reused
 
   $ hg serve -p $HGPORT --certificate=$PRIV 2>&1
   abort: cannot start server at 'localhost:$HGPORT': $EADDRINUSE$
   [255]
 
   $ cd ..
 
 Our test cert is not signed by a trusted CA. It should fail to verify if
 we are able to load CA certs.
 
 #if no-defaultcacertsloaded
   $ hg clone https://localhost:$HGPORT/ copy-pull
   (an attempt was made to load CA certificates but none were loaded; see https://mercurial-scm.org/wiki/SecureConnections for how to configure Mercurial to avoid this error)
   abort: error: *certificate verify failed* (glob)
   [255]
 #endif
 
 #if defaultcacertsloaded
   $ hg clone https://localhost:$HGPORT/ copy-pull
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   (the full certificate chain may not be available locally; see "hg help debugssl") (windows !)
   abort: error: *certificate verify failed* (glob)
   [255]
 #endif
 
 Specifying a per-host certificate file that doesn't exist will abort.  The full
 C:/path/to/msysroot will print on Windows.
 
   $ hg --config hostsecurity.localhost:verifycertsfile=/does/not/exist clone https://localhost:$HGPORT/
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   abort: path specified by hostsecurity.localhost:verifycertsfile does not exist: */does/not/exist (glob)
   [255]
 
 A malformed per-host certificate file will raise an error
 
   $ echo baddata > badca.pem
   $ hg --config hostsecurity.localhost:verifycertsfile=badca.pem clone https://localhost:$HGPORT/
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   abort: error loading CA file badca.pem: * (glob)
   (file is empty or malformed?)
   [255]
 
 A per-host certificate mismatching the server will fail verification
 
 (modern ssl is able to discern whether the loaded cert is a CA cert)
   $ hg --config hostsecurity.localhost:verifycertsfile="$CERTSDIR/client-cert.pem" clone https://localhost:$HGPORT/
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   (an attempt was made to load CA certificates but none were loaded; see https://mercurial-scm.org/wiki/SecureConnections for how to configure Mercurial to avoid this error)
   (the full certificate chain may not be available locally; see "hg help debugssl") (windows !)
   abort: error: *certificate verify failed* (glob)
   [255]
 
 A per-host certificate matching the server's cert will be accepted
 
   $ hg --config hostsecurity.localhost:verifycertsfile="$CERTSDIR/pub.pem" clone -U https://localhost:$HGPORT/ perhostgood1
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   requesting all changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 4 changes to 4 files
   new changesets 8b6053c928fe
 
 A per-host certificate with multiple certs and one matching will be accepted
 
   $ cat "$CERTSDIR/client-cert.pem" "$CERTSDIR/pub.pem" > perhost.pem
   $ hg --config hostsecurity.localhost:verifycertsfile=perhost.pem clone -U https://localhost:$HGPORT/ perhostgood2
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   requesting all changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 4 changes to 4 files
   new changesets 8b6053c928fe
 
 Defining both per-host certificate and a fingerprint will print a warning
 
   $ hg --config hostsecurity.localhost:verifycertsfile="$CERTSDIR/pub.pem" --config hostsecurity.localhost:fingerprints=sha1:ecd87cd6b386d04fc1b8b41c9d8f5e168eef1c03 clone -U https://localhost:$HGPORT/ caandfingerwarning
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   (hostsecurity.localhost:verifycertsfile ignored when host fingerprints defined; using host fingerprints for verification)
   requesting all changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 4 changes to 4 files
   new changesets 8b6053c928fe
 
   $ DISABLECACERTS="--config devel.disableloaddefaultcerts=true"
 
 Inability to verify peer certificate will result in abort
 
   $ hg clone https://localhost:$HGPORT/ copy-pull $DISABLECACERTS
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   abort: unable to verify security of localhost (no loaded CA certificates); refusing to connect
   (see https://mercurial-scm.org/wiki/SecureConnections for how to configure Mercurial to avoid this error or set hostsecurity.localhost:fingerprints=sha256:20:de:b3:ad:b4:cd:a5:42:f0:74:41:1c:a2:70:1e:da:6e:c0:5c:16:9e:e7:22:0f:f1:b7:e5:6e:e4:92:af:7e to trust this server)
   [255]
 
   $ hg clone --insecure https://localhost:$HGPORT/ copy-pull
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   warning: connection security to localhost is disabled per current settings; communication is susceptible to eavesdropping and tampering
   requesting all changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 4 changes to 4 files
   new changesets 8b6053c928fe
   updating to branch default
   4 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ hg verify -R copy-pull
   checking changesets
   checking manifests
   crosschecking files in changesets and manifests
   checking files
   checked 1 changesets with 4 changes to 4 files
   $ cd test
   $ echo bar > bar
   $ hg commit -A -d '1 0' -m 2
   adding bar
   $ cd ..
 
 pull without cacert
 
   $ cd copy-pull
   $ cat >> .hg/hgrc <<EOF
   > [hooks]
   > changegroup = sh -c "printenv.py --line changegroup"
   > EOF
   $ hg pull $DISABLECACERTS
   pulling from https://localhost:$HGPORT/
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   abort: unable to verify security of localhost (no loaded CA certificates); refusing to connect
   (see https://mercurial-scm.org/wiki/SecureConnections for how to configure Mercurial to avoid this error or set hostsecurity.localhost:fingerprints=sha256:20:de:b3:ad:b4:cd:a5:42:f0:74:41:1c:a2:70:1e:da:6e:c0:5c:16:9e:e7:22:0f:f1:b7:e5:6e:e4:92:af:7e to trust this server)
   [255]
 
   $ hg pull --insecure
   pulling from https://localhost:$HGPORT/
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   warning: connection security to localhost is disabled per current settings; communication is susceptible to eavesdropping and tampering
   searching for changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 1 changes to 1 files
   new changesets 5fed3813f7f5
   changegroup hook: HG_HOOKNAME=changegroup
   HG_HOOKTYPE=changegroup
   HG_NODE=5fed3813f7f5e1824344fdc9cf8f63bb662c292d
   HG_NODE_LAST=5fed3813f7f5e1824344fdc9cf8f63bb662c292d
   HG_SOURCE=pull
   HG_TXNID=TXN:$ID$
   HG_TXNNAME=pull
   https://localhost:$HGPORT/
   HG_URL=https://localhost:$HGPORT/
   
   (run 'hg update' to get a working copy)
   $ cd ..
 
 cacert configured in local repo
 
   $ cp copy-pull/.hg/hgrc copy-pull/.hg/hgrc.bu
   $ echo "[web]" >> copy-pull/.hg/hgrc
   $ echo "cacerts=$CERTSDIR/pub.pem" >> copy-pull/.hg/hgrc
   $ hg -R copy-pull pull
   pulling from https://localhost:$HGPORT/
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   searching for changes
   no changes found
   $ mv copy-pull/.hg/hgrc.bu copy-pull/.hg/hgrc
 
 cacert configured globally, also testing expansion of environment
 variables in the filename
 
   $ echo "[web]" >> $HGRCPATH
   $ echo 'cacerts=$P/pub.pem' >> $HGRCPATH
   $ P="$CERTSDIR" hg -R copy-pull pull
   pulling from https://localhost:$HGPORT/
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   searching for changes
   no changes found
   $ P="$CERTSDIR" hg -R copy-pull pull --insecure
   pulling from https://localhost:$HGPORT/
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   warning: connection security to localhost is disabled per current settings; communication is susceptible to eavesdropping and tampering
   searching for changes
   no changes found
 
 empty cacert file
 
   $ touch emptycafile
 
   $ hg --config web.cacerts=emptycafile -R copy-pull pull
   pulling from https://localhost:$HGPORT/
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   abort: error loading CA file emptycafile: * (glob)
   (file is empty or malformed?)
   [255]
 
 cacert mismatch
 
   $ hg -R copy-pull pull --config web.cacerts="$CERTSDIR/pub.pem" \
   > https://$LOCALIP:$HGPORT/
   pulling from https://*:$HGPORT/ (glob)
-  warning: connecting to $LOCALIP using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   abort: $LOCALIP certificate error: certificate is for localhost (glob)
   (set hostsecurity.$LOCALIP:certfingerprints=sha256:20:de:b3:ad:b4:cd:a5:42:f0:74:41:1c:a2:70:1e:da:6e:c0:5c:16:9e:e7:22:0f:f1:b7:e5:6e:e4:92:af:7e config setting or use --insecure to connect insecurely)
   [255]
   $ hg -R copy-pull pull --config web.cacerts="$CERTSDIR/pub.pem" \
   > https://$LOCALIP:$HGPORT/ --insecure
   pulling from https://*:$HGPORT/ (glob)
-  warning: connecting to $LOCALIP using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   warning: connection security to $LOCALIP is disabled per current settings; communication is susceptible to eavesdropping and tampering (glob)
   searching for changes
   no changes found
   $ hg -R copy-pull pull --config web.cacerts="$CERTSDIR/pub-other.pem"
   pulling from https://localhost:$HGPORT/
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   (the full certificate chain may not be available locally; see "hg help debugssl") (windows !)
   abort: error: *certificate verify failed* (glob)
   [255]
   $ hg -R copy-pull pull --config web.cacerts="$CERTSDIR/pub-other.pem" \
   > --insecure
   pulling from https://localhost:$HGPORT/
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   warning: connection security to localhost is disabled per current settings; communication is susceptible to eavesdropping and tampering
   searching for changes
   no changes found
 
 Test server cert which isn't valid yet
 
   $ hg serve -R test -p $HGPORT1 -d --pid-file=hg1.pid --certificate=server-not-yet.pem
   $ cat hg1.pid >> $DAEMON_PIDS
   $ hg -R copy-pull pull --config web.cacerts="$CERTSDIR/pub-not-yet.pem" \
   > https://localhost:$HGPORT1/
   pulling from https://localhost:$HGPORT1/
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   (the full certificate chain may not be available locally; see "hg help debugssl") (windows !)
   abort: error: *certificate verify failed* (glob)
   [255]
 
 Test server cert which no longer is valid
 
   $ hg serve -R test -p $HGPORT2 -d --pid-file=hg2.pid --certificate=server-expired.pem
   $ cat hg2.pid >> $DAEMON_PIDS
   $ hg -R copy-pull pull --config web.cacerts="$CERTSDIR/pub-expired.pem" \
   > https://localhost:$HGPORT2/
   pulling from https://localhost:$HGPORT2/
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   (the full certificate chain may not be available locally; see "hg help debugssl") (windows !)
   abort: error: *certificate verify failed* (glob)
   [255]
 
 Disabling the TLS 1.0 warning works
   $ hg -R copy-pull id https://localhost:$HGPORT/ \
   > --config hostsecurity.localhost:fingerprints=sha1:ecd87cd6b386d04fc1b8b41c9d8f5e168eef1c03 \
   > --config hostsecurity.disabletls10warning=true
   5fed3813f7f5
 
 Setting ciphers to an invalid value aborts
   $ P="$CERTSDIR" hg --config hostsecurity.ciphers=invalid -R copy-pull id https://localhost:$HGPORT/
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   abort: could not set ciphers: No cipher can be selected.
   (change cipher string (invalid) in config)
   [255]
 
   $ P="$CERTSDIR" hg --config hostsecurity.localhost:ciphers=invalid -R copy-pull id https://localhost:$HGPORT/
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   abort: could not set ciphers: No cipher can be selected.
   (change cipher string (invalid) in config)
   [255]
 
 Changing the cipher string works
 
   $ P="$CERTSDIR" hg --config hostsecurity.ciphers=HIGH -R copy-pull id https://localhost:$HGPORT/
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   5fed3813f7f5
 
 Fingerprints
 
 - works without cacerts (hostfingerprints)
   $ hg -R copy-pull id https://localhost:$HGPORT/ --insecure --config hostfingerprints.localhost=ec:d8:7c:d6:b3:86:d0:4f:c1:b8:b4:1c:9d:8f:5e:16:8e:ef:1c:03
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   (SHA-1 fingerprint for localhost found in legacy [hostfingerprints] section; if you trust this fingerprint, remove the old SHA-1 fingerprint from [hostfingerprints] and add the following entry to the new [hostsecurity] section: localhost:fingerprints=sha256:20:de:b3:ad:b4:cd:a5:42:f0:74:41:1c:a2:70:1e:da:6e:c0:5c:16:9e:e7:22:0f:f1:b7:e5:6e:e4:92:af:7e)
   5fed3813f7f5
 
 - works without cacerts (hostsecurity)
   $ hg -R copy-pull id https://localhost:$HGPORT/ --config hostsecurity.localhost:fingerprints=sha1:ecd87cd6b386d04fc1b8b41c9d8f5e168eef1c03
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   5fed3813f7f5
 
   $ hg -R copy-pull id https://localhost:$HGPORT/ --config hostsecurity.localhost:fingerprints=sha256:20:de:b3:ad:b4:cd:a5:42:f0:74:41:1c:a2:70:1e:da:6e:c0:5c:16:9e:e7:22:0f:f1:b7:e5:6e:e4:92:af:7e
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   5fed3813f7f5
 
 - multiple fingerprints specified and first matches
   $ hg --config 'hostfingerprints.localhost=ecd87cd6b386d04fc1b8b41c9d8f5e168eef1c03, deadbeefdeadbeefdeadbeefdeadbeefdeadbeef' -R copy-pull id https://localhost:$HGPORT/ --insecure
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   (SHA-1 fingerprint for localhost found in legacy [hostfingerprints] section; if you trust this fingerprint, remove the old SHA-1 fingerprint from [hostfingerprints] and add the following entry to the new [hostsecurity] section: localhost:fingerprints=sha256:20:de:b3:ad:b4:cd:a5:42:f0:74:41:1c:a2:70:1e:da:6e:c0:5c:16:9e:e7:22:0f:f1:b7:e5:6e:e4:92:af:7e)
   5fed3813f7f5
 
   $ hg --config 'hostsecurity.localhost:fingerprints=sha1:ecd87cd6b386d04fc1b8b41c9d8f5e168eef1c03, sha1:deadbeefdeadbeefdeadbeefdeadbeefdeadbeef' -R copy-pull id https://localhost:$HGPORT/
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   5fed3813f7f5
 
 - multiple fingerprints specified and last matches
   $ hg --config 'hostfingerprints.localhost=deadbeefdeadbeefdeadbeefdeadbeefdeadbeef, ecd87cd6b386d04fc1b8b41c9d8f5e168eef1c03' -R copy-pull id https://localhost:$HGPORT/ --insecure
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   (SHA-1 fingerprint for localhost found in legacy [hostfingerprints] section; if you trust this fingerprint, remove the old SHA-1 fingerprint from [hostfingerprints] and add the following entry to the new [hostsecurity] section: localhost:fingerprints=sha256:20:de:b3:ad:b4:cd:a5:42:f0:74:41:1c:a2:70:1e:da:6e:c0:5c:16:9e:e7:22:0f:f1:b7:e5:6e:e4:92:af:7e)
   5fed3813f7f5
 
   $ hg --config 'hostsecurity.localhost:fingerprints=sha1:deadbeefdeadbeefdeadbeefdeadbeefdeadbeef, sha1:ecd87cd6b386d04fc1b8b41c9d8f5e168eef1c03' -R copy-pull id https://localhost:$HGPORT/
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   5fed3813f7f5
 
 - multiple fingerprints specified and none match
 
   $ hg --config 'hostfingerprints.localhost=deadbeefdeadbeefdeadbeefdeadbeefdeadbeef, aeadbeefdeadbeefdeadbeefdeadbeefdeadbeef' -R copy-pull id https://localhost:$HGPORT/ --insecure
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   abort: certificate for localhost has unexpected fingerprint ec:d8:7c:d6:b3:86:d0:4f:c1:b8:b4:1c:9d:8f:5e:16:8e:ef:1c:03
   (check hostfingerprint configuration)
   [255]
 
   $ hg --config 'hostsecurity.localhost:fingerprints=sha1:deadbeefdeadbeefdeadbeefdeadbeefdeadbeef, sha1:aeadbeefdeadbeefdeadbeefdeadbeefdeadbeef' -R copy-pull id https://localhost:$HGPORT/
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   abort: certificate for localhost has unexpected fingerprint sha1:ec:d8:7c:d6:b3:86:d0:4f:c1:b8:b4:1c:9d:8f:5e:16:8e:ef:1c:03
   (check hostsecurity configuration)
   [255]
 
 - fails when cert doesn't match hostname (port is ignored)
   $ hg -R copy-pull id https://localhost:$HGPORT1/ --config hostfingerprints.localhost=ecd87cd6b386d04fc1b8b41c9d8f5e168eef1c03
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   abort: certificate for localhost has unexpected fingerprint f4:2f:5a:0c:3e:52:5b:db:e7:24:a8:32:1d:18:97:6d:69:b5:87:84
   (check hostfingerprint configuration)
   [255]
 
 
 - ignores that certificate doesn't match hostname
   $ hg -R copy-pull id https://$LOCALIP:$HGPORT/ --config hostfingerprints.$LOCALIP=ecd87cd6b386d04fc1b8b41c9d8f5e168eef1c03
-  warning: connecting to $LOCALIP using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   (SHA-1 fingerprint for $LOCALIP found in legacy [hostfingerprints] section; if you trust this fingerprint, remove the old SHA-1 fingerprint from [hostfingerprints] and add the following entry to the new [hostsecurity] section: $LOCALIP:fingerprints=sha256:20:de:b3:ad:b4:cd:a5:42:f0:74:41:1c:a2:70:1e:da:6e:c0:5c:16:9e:e7:22:0f:f1:b7:e5:6e:e4:92:af:7e)
   5fed3813f7f5
 
 Ports used by next test. Kill servers.
 
   $ killdaemons.py hg0.pid
   $ killdaemons.py hg1.pid
   $ killdaemons.py hg2.pid
 
 #if tls1.2
 Start servers running supported TLS versions
 
   $ cd test
   $ hg serve -p $HGPORT -d --pid-file=../hg0.pid --certificate=$PRIV \
   > --config devel.serverexactprotocol=tls1.0
   $ cat ../hg0.pid >> $DAEMON_PIDS
   $ hg serve -p $HGPORT1 -d --pid-file=../hg1.pid --certificate=$PRIV \
   > --config devel.serverexactprotocol=tls1.1
   $ cat ../hg1.pid >> $DAEMON_PIDS
   $ hg serve -p $HGPORT2 -d --pid-file=../hg2.pid --certificate=$PRIV \
   > --config devel.serverexactprotocol=tls1.2
   $ cat ../hg2.pid >> $DAEMON_PIDS
   $ cd ..
 
 Clients talking same TLS versions work
 
   $ P="$CERTSDIR" hg --config hostsecurity.minimumprotocol=tls1.0 id https://localhost:$HGPORT/
   5fed3813f7f5
   $ P="$CERTSDIR" hg --config hostsecurity.minimumprotocol=tls1.1 id https://localhost:$HGPORT1/
   5fed3813f7f5
   $ P="$CERTSDIR" hg --config hostsecurity.minimumprotocol=tls1.2 id https://localhost:$HGPORT2/
   5fed3813f7f5
 
 Clients requiring newer TLS version than what server supports fail
 
   $ P="$CERTSDIR" hg id https://localhost:$HGPORT/
   (could not negotiate a common security protocol (tls1.1+) with localhost; the likely cause is Mercurial is configured to be more secure than the server can support)
   (consider contacting the operator of this server and ask them to support modern TLS protocol versions; or, set hostsecurity.localhost:minimumprotocol=tls1.0 to allow use of legacy, less secure protocols when communicating with this server)
   (see https://mercurial-scm.org/wiki/SecureConnections for more info)
   abort: error: .*(unsupported protocol|wrong ssl version).* (re)
   [255]
 
   $ P="$CERTSDIR" hg --config hostsecurity.minimumprotocol=tls1.1 id https://localhost:$HGPORT/
   (could not negotiate a common security protocol (tls1.1+) with localhost; the likely cause is Mercurial is configured to be more secure than the server can support)
   (consider contacting the operator of this server and ask them to support modern TLS protocol versions; or, set hostsecurity.localhost:minimumprotocol=tls1.0 to allow use of legacy, less secure protocols when communicating with this server)
   (see https://mercurial-scm.org/wiki/SecureConnections for more info)
   abort: error: .*(unsupported protocol|wrong ssl version).* (re)
   [255]
   $ P="$CERTSDIR" hg --config hostsecurity.minimumprotocol=tls1.2 id https://localhost:$HGPORT/
   (could not negotiate a common security protocol (tls1.2+) with localhost; the likely cause is Mercurial is configured to be more secure than the server can support)
   (consider contacting the operator of this server and ask them to support modern TLS protocol versions; or, set hostsecurity.localhost:minimumprotocol=tls1.0 to allow use of legacy, less secure protocols when communicating with this server)
   (see https://mercurial-scm.org/wiki/SecureConnections for more info)
   abort: error: .*(unsupported protocol|wrong ssl version).* (re)
   [255]
   $ P="$CERTSDIR" hg --config hostsecurity.minimumprotocol=tls1.2 id https://localhost:$HGPORT1/
   (could not negotiate a common security protocol (tls1.2+) with localhost; the likely cause is Mercurial is configured to be more secure than the server can support)
   (consider contacting the operator of this server and ask them to support modern TLS protocol versions; or, set hostsecurity.localhost:minimumprotocol=tls1.0 to allow use of legacy, less secure protocols when communicating with this server)
   (see https://mercurial-scm.org/wiki/SecureConnections for more info)
   abort: error: .*(unsupported protocol|wrong ssl version).* (re)
   [255]
 
 --insecure will allow TLS 1.0 connections and override configs
 
   $ hg --config hostsecurity.minimumprotocol=tls1.2 id --insecure https://localhost:$HGPORT1/
   warning: connection security to localhost is disabled per current settings; communication is susceptible to eavesdropping and tampering
   5fed3813f7f5
 
 The per-host config option overrides the default
 
   $ P="$CERTSDIR" hg id https://localhost:$HGPORT/ \
   > --config hostsecurity.minimumprotocol=tls1.2 \
   > --config hostsecurity.localhost:minimumprotocol=tls1.0
   5fed3813f7f5
 
 The per-host config option by itself works
 
   $ P="$CERTSDIR" hg id https://localhost:$HGPORT/ \
   > --config hostsecurity.localhost:minimumprotocol=tls1.2
   (could not negotiate a common security protocol (tls1.2+) with localhost; the likely cause is Mercurial is configured to be more secure than the server can support)
   (consider contacting the operator of this server and ask them to support modern TLS protocol versions; or, set hostsecurity.localhost:minimumprotocol=tls1.0 to allow use of legacy, less secure protocols when communicating with this server)
   (see https://mercurial-scm.org/wiki/SecureConnections for more info)
   abort: error: .*(unsupported protocol|wrong ssl version).* (re)
   [255]
 
 .hg/hgrc file [hostsecurity] settings are applied to remote ui instances (issue5305)
 
   $ cat >> copy-pull/.hg/hgrc << EOF
   > [hostsecurity]
   > localhost:minimumprotocol=tls1.2
   > EOF
   $ P="$CERTSDIR" hg -R copy-pull id https://localhost:$HGPORT/
   (could not negotiate a common security protocol (tls1.2+) with localhost; the likely cause is Mercurial is configured to be more secure than the server can support)
   (consider contacting the operator of this server and ask them to support modern TLS protocol versions; or, set hostsecurity.localhost:minimumprotocol=tls1.0 to allow use of legacy, less secure protocols when communicating with this server)
   (see https://mercurial-scm.org/wiki/SecureConnections for more info)
   abort: error: .*(unsupported protocol|wrong ssl version).* (re)
   [255]
 
   $ killdaemons.py hg0.pid
   $ killdaemons.py hg1.pid
   $ killdaemons.py hg2.pid
 #endif
 
 Prepare for connecting through proxy
 
   $ hg serve -R test -p $HGPORT -d --pid-file=hg0.pid --certificate=$PRIV
   $ cat hg0.pid >> $DAEMON_PIDS
   $ hg serve -R test -p $HGPORT2 -d --pid-file=hg2.pid --certificate=server-expired.pem
   $ cat hg2.pid >> $DAEMON_PIDS
 tinyproxy.py doesn't fully detach, so killing it may result in extra output
 from the shell. So don't kill it.
   $ tinyproxy.py $HGPORT1 localhost >proxy.log </dev/null 2>&1 &
   $ while [ ! -f proxy.pid ]; do sleep 0; done
   $ cat proxy.pid >> $DAEMON_PIDS
 
   $ echo "[http_proxy]" >> copy-pull/.hg/hgrc
   $ echo "always=True" >> copy-pull/.hg/hgrc
   $ echo "[hostfingerprints]" >> copy-pull/.hg/hgrc
   $ echo "localhost =" >> copy-pull/.hg/hgrc
 
 Test unvalidated https through proxy
 
   $ http_proxy=http://localhost:$HGPORT1/ hg -R copy-pull pull --insecure
   pulling from https://localhost:$HGPORT/
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   warning: connection security to localhost is disabled per current settings; communication is susceptible to eavesdropping and tampering
   searching for changes
   no changes found
 
 Test https with cacert and fingerprint through proxy
 
   $ http_proxy=http://localhost:$HGPORT1/ hg -R copy-pull pull \
   > --config web.cacerts="$CERTSDIR/pub.pem"
   pulling from https://localhost:$HGPORT/
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   searching for changes
   no changes found
   $ http_proxy=http://localhost:$HGPORT1/ hg -R copy-pull pull https://localhost:$HGPORT/ --config hostfingerprints.localhost=ecd87cd6b386d04fc1b8b41c9d8f5e168eef1c03 --trace
   pulling from https://*:$HGPORT/ (glob)
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   (SHA-1 fingerprint for localhost found in legacy [hostfingerprints] section; if you trust this fingerprint, remove the old SHA-1 fingerprint from [hostfingerprints] and add the following entry to the new [hostsecurity] section: localhost:fingerprints=sha256:20:de:b3:ad:b4:cd:a5:42:f0:74:41:1c:a2:70:1e:da:6e:c0:5c:16:9e:e7:22:0f:f1:b7:e5:6e:e4:92:af:7e)
   searching for changes
   no changes found
 
 Test https with cert problems through proxy
 
   $ http_proxy=http://localhost:$HGPORT1/ hg -R copy-pull pull \
   > --config web.cacerts="$CERTSDIR/pub-other.pem"
   pulling from https://localhost:$HGPORT/
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   (the full certificate chain may not be available locally; see "hg help debugssl") (windows !)
   abort: error: *certificate verify failed* (glob)
   [255]
   $ http_proxy=http://localhost:$HGPORT1/ hg -R copy-pull pull \
   > --config web.cacerts="$CERTSDIR/pub-expired.pem" https://localhost:$HGPORT2/
   pulling from https://localhost:$HGPORT2/
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   (the full certificate chain may not be available locally; see "hg help debugssl") (windows !)
   abort: error: *certificate verify failed* (glob)
   [255]
 
 
   $ killdaemons.py hg0.pid
 
   $ cd test
 
 Missing certificate file(s) are detected
 
   $ hg serve -p $HGPORT --certificate=/missing/certificate \
   > --config devel.servercafile=$PRIV --config devel.serverrequirecert=true
   abort: referenced certificate file (*/missing/certificate) does not exist (glob)
   [255]
 
   $ hg serve -p $HGPORT --certificate=$PRIV \
   > --config devel.servercafile=/missing/cafile --config devel.serverrequirecert=true
   abort: referenced certificate file (*/missing/cafile) does not exist (glob)
   [255]
 
 Start hgweb that requires client certificates:
 
   $ hg serve -p $HGPORT -d --pid-file=../hg0.pid --certificate=$PRIV \
   > --config devel.servercafile=$PRIV --config devel.serverrequirecert=true
   $ cat ../hg0.pid >> $DAEMON_PIDS
   $ cd ..
 
 without client certificate:
 
   $ P="$CERTSDIR" hg id https://localhost:$HGPORT/
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   abort: error: .*(\$ECONNRESET\$|certificate required|handshake failure).* (re)
   [255]
 
 with client certificate:
 
   $ cat << EOT >> $HGRCPATH
   > [auth]
   > l.prefix = localhost
   > l.cert = $CERTSDIR/client-cert.pem
   > l.key = $CERTSDIR/client-key.pem
   > EOT
 
   $ P="$CERTSDIR" hg id https://localhost:$HGPORT/ \
   > --config auth.l.key="$CERTSDIR/client-key-decrypted.pem"
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   5fed3813f7f5
 
   $ printf '1234\n' | env P="$CERTSDIR" hg id https://localhost:$HGPORT/ \
   > --config ui.interactive=True --config ui.nontty=True
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   passphrase for */client-key.pem: 5fed3813f7f5 (glob)
 
   $ env P="$CERTSDIR" hg id https://localhost:$HGPORT/
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   abort: error: * (glob)
   [255]
 
 Missing certficate and key files result in error
 
   $ hg id https://localhost:$HGPORT/ --config auth.l.cert=/missing/cert
   abort: certificate file (*/missing/cert) does not exist; cannot connect to localhost (glob)
   (restore missing file or fix references in Mercurial config)
   [255]
 
   $ hg id https://localhost:$HGPORT/ --config auth.l.key=/missing/key
   abort: certificate file (*/missing/key) does not exist; cannot connect to localhost (glob)
   (restore missing file or fix references in Mercurial config)
   [255]

tests/test-patchbomb-tls.t

@@ -1,103 +1,99 b''
 #require serve ssl
 
 Set up SMTP server:
 
   $ CERTSDIR="$TESTDIR/sslcerts"
   $ cat "$CERTSDIR/priv.pem" "$CERTSDIR/pub.pem" >> server.pem
 
   $ "$PYTHON" "$TESTDIR/dummysmtpd.py" -p $HGPORT --pid-file a.pid -d \
   > --tls smtps --certificate `pwd`/server.pem
   listening at localhost:$HGPORT (?)
   $ cat a.pid >> $DAEMON_PIDS
 
 Set up repository:
 
   $ hg init t
   $ cd t
   $ cat <<EOF >> .hg/hgrc
   > [extensions]
   > patchbomb =
   > [email]
   > method = smtp
   > [smtp]
   > host = localhost
   > port = $HGPORT
   > tls = smtps
   > EOF
 
   $ echo a > a
   $ hg commit -Ama -d '1 0'
   adding a
 
 Utility functions:
 
   $ DISABLECACERTS=
   $ try () {
   >   hg email $DISABLECACERTS -f quux -t foo -c bar -r tip "$@"
   > }
 
 Our test cert is not signed by a trusted CA. It should fail to verify if
 we are able to load CA certs:
 
 #if no-defaultcacertsloaded
   $ try
   this patch series consists of 1 patches.
   
   
   (an attempt was made to load CA certificates but none were loaded; see https://mercurial-scm.org/wiki/SecureConnections for how to configure Mercurial to avoid this error)
   (?i)abort: .*?certificate.verify.failed.* (re)
   [255]
 #endif
 
 #if defaultcacertsloaded
   $ try
   this patch series consists of 1 patches.
   
   
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   (the full certificate chain may not be available locally; see "hg help debugssl") (windows !)
   (?i)abort: .*?certificate.verify.failed.* (re)
   [255]
 
 #endif
 
   $ DISABLECACERTS="--config devel.disableloaddefaultcerts=true"
 
 Without certificates:
 
   $ try --debug
   this patch series consists of 1 patches.
   
   
   (using smtps)
   sending mail: smtp host localhost, port * (glob)
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   (verifying remote certificate)
   abort: unable to verify security of localhost (no loaded CA certificates); refusing to connect
   (see https://mercurial-scm.org/wiki/SecureConnections for how to configure Mercurial to avoid this error or set hostsecurity.localhost:fingerprints=sha256:20:de:b3:ad:b4:cd:a5:42:f0:74:41:1c:a2:70:1e:da:6e:c0:5c:16:9e:e7:22:0f:f1:b7:e5:6e:e4:92:af:7e to trust this server)
   [255]
 
 With global certificates:
 
   $ try --debug --config web.cacerts="$CERTSDIR/pub.pem"
   this patch series consists of 1 patches.
   
   
   (using smtps)
   sending mail: smtp host localhost, port * (glob)
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   (verifying remote certificate)
   sending [PATCH] a ...
 
 With invalid certificates:
 
   $ try --config web.cacerts="$CERTSDIR/pub-other.pem"
   this patch series consists of 1 patches.
   
   
-  warning: connecting to localhost using legacy security technology (TLS 1.0); see https://mercurial-scm.org/wiki/SecureConnections for more info (?)
   (the full certificate chain may not be available locally; see "hg help debugssl") (windows !)
   (?i)abort: .*?certificate.verify.failed.* (re)
   [255]
 
   $ cd ..