Mercurial > hg
view mercurial/sslutil.py @ 26379:39d643252b9f
revlog: use existing file handle when reading during _addrevision
_addrevision() may need to read from revlogs as part of computing
deltas. Previously, we would flush existing file handles and open
a new, short-lived file handle to perform the reading.
If we have an existing file handle, it seems logical to reuse it
for reading instead of opening a new file handle. This patch
makes that the new behavior.
After this patch, revlog files are only reopened when adding
revisions if the revlog is switched from inline to non-inline.
On Linux when unbundling a bundle of the mozilla-central repo, this
patch has the following impact on system call counts:
Call Before After Delta
write 827,639 673,390 -154,249
open 700,103 684,089 -16,014
read 74,489 74,489 0
fstat 493,924 461,896 -32,028
close 249,131 233,117 -16,014
stat 242,001 242,001 0
lstat 18,676 18,676 0
lseek 20,268 20,268 0
ioctl 14,652 13,173 -1,479
TOTAL 3,180,758 2,930,679 -250,079
It's worth noting that many of the open() calls fail due to missing
files. That's why there are many more open() calls than close().
Despite the significant system call reduction, this change does not
seem to have a significant performance impact on Linux.
On Windows 10 (not a VM, on a SSD), this patch appears to reduce
unbundle time for mozilla-central from ~960s to ~920s. This isn't
as significant as I was hoping. But a decrease it is nonetheless.
Still, Windows unbundle performance is still >2x slower than Linux.
Despite the lack of significant gains, fewer system calls is fewer
system calls. If nothing else, this will narrow the focus of potential
areas to optimize in the future.
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Sun, 27 Sep 2015 16:08:18 -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))