mirror of
https://github.com/facebook/sapling.git
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7d9a563a01
Some draconian IT setups lock accounts after a small number of incorrect password attempts. Mercurial's implementation of the urllib2 authentication was causing 5 retry attempts with the same credentials, without prompting the user. The code was attempting to check whether the authorization token had changed, but unfortunately was reading the misleading 'headers' member of the request instead of using the 'get_header' accessor. Modelled on fix for Python issue 8797: https://bugs.python.org/issue8797 https://hg.python.org/cpython/rev/30e8a8f22a2a
524 lines
18 KiB
Python
524 lines
18 KiB
Python
# url.py - HTTP handling for mercurial
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#
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# Copyright 2005, 2006, 2007, 2008 Matt Mackall <mpm@selenic.com>
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# Copyright 2006, 2007 Alexis S. L. Carvalho <alexis@cecm.usp.br>
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# Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from __future__ import absolute_import
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import base64
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import os
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import socket
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from .i18n import _
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from . import (
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error,
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httpconnection as httpconnectionmod,
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keepalive,
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sslutil,
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util,
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)
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httplib = util.httplib
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stringio = util.stringio
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urlerr = util.urlerr
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urlreq = util.urlreq
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class passwordmgr(object):
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def __init__(self, ui, passwddb):
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self.ui = ui
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self.passwddb = passwddb
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def add_password(self, realm, uri, user, passwd):
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return self.passwddb.add_password(realm, uri, user, passwd)
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def find_user_password(self, realm, authuri):
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authinfo = self.passwddb.find_user_password(realm, authuri)
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user, passwd = authinfo
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if user and passwd:
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self._writedebug(user, passwd)
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return (user, passwd)
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if not user or not passwd:
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res = httpconnectionmod.readauthforuri(self.ui, authuri, user)
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if res:
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group, auth = res
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user, passwd = auth.get('username'), auth.get('password')
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self.ui.debug("using auth.%s.* for authentication\n" % group)
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if not user or not passwd:
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u = util.url(authuri)
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u.query = None
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if not self.ui.interactive():
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raise error.Abort(_('http authorization required for %s') %
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util.hidepassword(str(u)))
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self.ui.write(_("http authorization required for %s\n") %
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util.hidepassword(str(u)))
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self.ui.write(_("realm: %s\n") % realm)
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if user:
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self.ui.write(_("user: %s\n") % user)
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else:
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user = self.ui.prompt(_("user:"), default=None)
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if not passwd:
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passwd = self.ui.getpass()
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self.passwddb.add_password(realm, authuri, user, passwd)
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self._writedebug(user, passwd)
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return (user, passwd)
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def _writedebug(self, user, passwd):
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msg = _('http auth: user %s, password %s\n')
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self.ui.debug(msg % (user, passwd and '*' * len(passwd) or 'not set'))
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def find_stored_password(self, authuri):
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return self.passwddb.find_user_password(None, authuri)
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class proxyhandler(urlreq.proxyhandler):
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def __init__(self, ui):
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proxyurl = ui.config("http_proxy", "host") or os.getenv('http_proxy')
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# XXX proxyauthinfo = None
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if proxyurl:
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# proxy can be proper url or host[:port]
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if not (proxyurl.startswith('http:') or
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proxyurl.startswith('https:')):
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proxyurl = 'http://' + proxyurl + '/'
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proxy = util.url(proxyurl)
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if not proxy.user:
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proxy.user = ui.config("http_proxy", "user")
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proxy.passwd = ui.config("http_proxy", "passwd")
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# see if we should use a proxy for this url
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no_list = ["localhost", "127.0.0.1"]
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no_list.extend([p.lower() for
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p in ui.configlist("http_proxy", "no")])
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no_list.extend([p.strip().lower() for
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p in os.getenv("no_proxy", '').split(',')
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if p.strip()])
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# "http_proxy.always" config is for running tests on localhost
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if ui.configbool("http_proxy", "always"):
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self.no_list = []
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else:
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self.no_list = no_list
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proxyurl = str(proxy)
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proxies = {'http': proxyurl, 'https': proxyurl}
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ui.debug('proxying through http://%s:%s\n' %
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(proxy.host, proxy.port))
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else:
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proxies = {}
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# urllib2 takes proxy values from the environment and those
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# will take precedence if found. So, if there's a config entry
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# defining a proxy, drop the environment ones
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if ui.config("http_proxy", "host"):
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for env in ["HTTP_PROXY", "http_proxy", "no_proxy"]:
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try:
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if env in os.environ:
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del os.environ[env]
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except OSError:
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pass
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urlreq.proxyhandler.__init__(self, proxies)
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self.ui = ui
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def proxy_open(self, req, proxy, type_):
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host = req.get_host().split(':')[0]
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for e in self.no_list:
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if host == e:
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return None
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if e.startswith('*.') and host.endswith(e[2:]):
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return None
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if e.startswith('.') and host.endswith(e[1:]):
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return None
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return urlreq.proxyhandler.proxy_open(self, req, proxy, type_)
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def _gen_sendfile(orgsend):
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def _sendfile(self, data):
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# send a file
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if isinstance(data, httpconnectionmod.httpsendfile):
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# if auth required, some data sent twice, so rewind here
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data.seek(0)
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for chunk in util.filechunkiter(data):
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orgsend(self, chunk)
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else:
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orgsend(self, data)
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return _sendfile
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has_https = util.safehasattr(urlreq, 'httpshandler')
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if has_https:
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try:
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_create_connection = socket.create_connection
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except AttributeError:
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_GLOBAL_DEFAULT_TIMEOUT = object()
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def _create_connection(address, timeout=_GLOBAL_DEFAULT_TIMEOUT,
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source_address=None):
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# lifted from Python 2.6
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msg = "getaddrinfo returns an empty list"
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host, port = address
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for res in socket.getaddrinfo(host, port, 0, socket.SOCK_STREAM):
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af, socktype, proto, canonname, sa = res
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sock = None
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try:
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sock = socket.socket(af, socktype, proto)
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if timeout is not _GLOBAL_DEFAULT_TIMEOUT:
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sock.settimeout(timeout)
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if source_address:
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sock.bind(source_address)
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sock.connect(sa)
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return sock
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except socket.error as msg:
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if sock is not None:
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sock.close()
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raise socket.error(msg)
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class httpconnection(keepalive.HTTPConnection):
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# must be able to send big bundle as stream.
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send = _gen_sendfile(keepalive.HTTPConnection.send)
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def getresponse(self):
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proxyres = getattr(self, 'proxyres', None)
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if proxyres:
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if proxyres.will_close:
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self.close()
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self.proxyres = None
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return proxyres
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return keepalive.HTTPConnection.getresponse(self)
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# general transaction handler to support different ways to handle
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# HTTPS proxying before and after Python 2.6.3.
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def _generic_start_transaction(handler, h, req):
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tunnel_host = getattr(req, '_tunnel_host', None)
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if tunnel_host:
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if tunnel_host[:7] not in ['http://', 'https:/']:
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tunnel_host = 'https://' + tunnel_host
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new_tunnel = True
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else:
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tunnel_host = req.get_selector()
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new_tunnel = False
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if new_tunnel or tunnel_host == req.get_full_url(): # has proxy
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u = util.url(tunnel_host)
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if new_tunnel or u.scheme == 'https': # only use CONNECT for HTTPS
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h.realhostport = ':'.join([u.host, (u.port or '443')])
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h.headers = req.headers.copy()
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h.headers.update(handler.parent.addheaders)
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return
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h.realhostport = None
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h.headers = None
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def _generic_proxytunnel(self):
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proxyheaders = dict(
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[(x, self.headers[x]) for x in self.headers
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if x.lower().startswith('proxy-')])
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self.send('CONNECT %s HTTP/1.0\r\n' % self.realhostport)
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for header in proxyheaders.iteritems():
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self.send('%s: %s\r\n' % header)
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self.send('\r\n')
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# majority of the following code is duplicated from
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# httplib.HTTPConnection as there are no adequate places to
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# override functions to provide the needed functionality
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res = self.response_class(self.sock,
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strict=self.strict,
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method=self._method)
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while True:
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version, status, reason = res._read_status()
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if status != httplib.CONTINUE:
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break
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while True:
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skip = res.fp.readline().strip()
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if not skip:
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break
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res.status = status
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res.reason = reason.strip()
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if res.status == 200:
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while True:
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line = res.fp.readline()
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if line == '\r\n':
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break
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return True
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if version == 'HTTP/1.0':
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res.version = 10
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elif version.startswith('HTTP/1.'):
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res.version = 11
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elif version == 'HTTP/0.9':
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res.version = 9
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else:
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raise httplib.UnknownProtocol(version)
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if res.version == 9:
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res.length = None
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res.chunked = 0
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res.will_close = 1
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res.msg = httplib.HTTPMessage(stringio())
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return False
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res.msg = httplib.HTTPMessage(res.fp)
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res.msg.fp = None
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# are we using the chunked-style of transfer encoding?
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trenc = res.msg.getheader('transfer-encoding')
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if trenc and trenc.lower() == "chunked":
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res.chunked = 1
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res.chunk_left = None
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else:
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res.chunked = 0
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# will the connection close at the end of the response?
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res.will_close = res._check_close()
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# do we have a Content-Length?
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# NOTE: RFC 2616, section 4.4, #3 says we ignore this if
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# transfer-encoding is "chunked"
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length = res.msg.getheader('content-length')
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if length and not res.chunked:
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try:
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res.length = int(length)
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except ValueError:
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res.length = None
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else:
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if res.length < 0: # ignore nonsensical negative lengths
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res.length = None
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else:
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res.length = None
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# does the body have a fixed length? (of zero)
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if (status == httplib.NO_CONTENT or status == httplib.NOT_MODIFIED or
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100 <= status < 200 or # 1xx codes
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res._method == 'HEAD'):
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res.length = 0
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# if the connection remains open, and we aren't using chunked, and
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# a content-length was not provided, then assume that the connection
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# WILL close.
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if (not res.will_close and
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not res.chunked and
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res.length is None):
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res.will_close = 1
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self.proxyres = res
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return False
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class httphandler(keepalive.HTTPHandler):
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def http_open(self, req):
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return self.do_open(httpconnection, req)
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def _start_transaction(self, h, req):
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_generic_start_transaction(self, h, req)
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return keepalive.HTTPHandler._start_transaction(self, h, req)
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if has_https:
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class httpsconnection(httplib.HTTPConnection):
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response_class = keepalive.HTTPResponse
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default_port = httplib.HTTPS_PORT
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# must be able to send big bundle as stream.
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send = _gen_sendfile(keepalive.safesend)
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getresponse = keepalive.wrapgetresponse(httplib.HTTPConnection)
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def __init__(self, host, port=None, key_file=None, cert_file=None,
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*args, **kwargs):
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httplib.HTTPConnection.__init__(self, host, port, *args, **kwargs)
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self.key_file = key_file
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self.cert_file = cert_file
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def connect(self):
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self.sock = _create_connection((self.host, self.port))
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host = self.host
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if self.realhostport: # use CONNECT proxy
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_generic_proxytunnel(self)
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host = self.realhostport.rsplit(':', 1)[0]
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self.sock = sslutil.wrapsocket(
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self.sock, self.key_file, self.cert_file, ui=self.ui,
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serverhostname=host)
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sslutil.validatesocket(self.sock)
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class httpshandler(keepalive.KeepAliveHandler, urlreq.httpshandler):
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def __init__(self, ui):
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keepalive.KeepAliveHandler.__init__(self)
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urlreq.httpshandler.__init__(self)
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self.ui = ui
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self.pwmgr = passwordmgr(self.ui,
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self.ui.httppasswordmgrdb)
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def _start_transaction(self, h, req):
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_generic_start_transaction(self, h, req)
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return keepalive.KeepAliveHandler._start_transaction(self, h, req)
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def https_open(self, req):
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# req.get_full_url() does not contain credentials and we may
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# need them to match the certificates.
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url = req.get_full_url()
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user, password = self.pwmgr.find_stored_password(url)
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res = httpconnectionmod.readauthforuri(self.ui, url, user)
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if res:
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group, auth = res
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self.auth = auth
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self.ui.debug("using auth.%s.* for authentication\n" % group)
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else:
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self.auth = None
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return self.do_open(self._makeconnection, req)
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def _makeconnection(self, host, port=None, *args, **kwargs):
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keyfile = None
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certfile = None
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if len(args) >= 1: # key_file
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keyfile = args[0]
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if len(args) >= 2: # cert_file
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certfile = args[1]
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args = args[2:]
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# if the user has specified different key/cert files in
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# hgrc, we prefer these
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if self.auth and 'key' in self.auth and 'cert' in self.auth:
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keyfile = self.auth['key']
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certfile = self.auth['cert']
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conn = httpsconnection(host, port, keyfile, certfile, *args,
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**kwargs)
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conn.ui = self.ui
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return conn
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class httpdigestauthhandler(urlreq.httpdigestauthhandler):
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def __init__(self, *args, **kwargs):
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urlreq.httpdigestauthhandler.__init__(self, *args, **kwargs)
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self.retried_req = None
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def reset_retry_count(self):
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# Python 2.6.5 will call this on 401 or 407 errors and thus loop
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# forever. We disable reset_retry_count completely and reset in
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# http_error_auth_reqed instead.
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pass
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def http_error_auth_reqed(self, auth_header, host, req, headers):
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# Reset the retry counter once for each request.
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if req is not self.retried_req:
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self.retried_req = req
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self.retried = 0
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return urlreq.httpdigestauthhandler.http_error_auth_reqed(
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self, auth_header, host, req, headers)
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class httpbasicauthhandler(urlreq.httpbasicauthhandler):
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def __init__(self, *args, **kwargs):
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self.auth = None
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urlreq.httpbasicauthhandler.__init__(self, *args, **kwargs)
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self.retried_req = None
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def http_request(self, request):
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if self.auth:
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request.add_unredirected_header(self.auth_header, self.auth)
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return request
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def https_request(self, request):
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if self.auth:
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request.add_unredirected_header(self.auth_header, self.auth)
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return request
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def reset_retry_count(self):
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# Python 2.6.5 will call this on 401 or 407 errors and thus loop
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# forever. We disable reset_retry_count completely and reset in
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# http_error_auth_reqed instead.
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pass
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def http_error_auth_reqed(self, auth_header, host, req, headers):
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# Reset the retry counter once for each request.
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if req is not self.retried_req:
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self.retried_req = req
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self.retried = 0
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return urlreq.httpbasicauthhandler.http_error_auth_reqed(
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self, auth_header, host, req, headers)
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def retry_http_basic_auth(self, host, req, realm):
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user, pw = self.passwd.find_user_password(realm, req.get_full_url())
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if pw is not None:
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raw = "%s:%s" % (user, pw)
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auth = 'Basic %s' % base64.b64encode(raw).strip()
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if req.get_header(self.auth_header, None) == auth:
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return None
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self.auth = auth
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req.add_unredirected_header(self.auth_header, auth)
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return self.parent.open(req)
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else:
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return None
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handlerfuncs = []
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def opener(ui, authinfo=None):
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'''
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construct an opener suitable for urllib2
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authinfo will be added to the password manager
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'''
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# experimental config: ui.usehttp2
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if ui.configbool('ui', 'usehttp2', False):
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handlers = [
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httpconnectionmod.http2handler(
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ui,
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passwordmgr(ui, ui.httppasswordmgrdb))
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]
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else:
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handlers = [httphandler()]
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if has_https:
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handlers.append(httpshandler(ui))
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handlers.append(proxyhandler(ui))
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passmgr = passwordmgr(ui, ui.httppasswordmgrdb)
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if authinfo is not None:
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realm, uris, user, passwd = authinfo
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saveduser, savedpass = passmgr.find_stored_password(uris[0])
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if user != saveduser or passwd:
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passmgr.add_password(realm, uris, user, passwd)
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ui.debug('http auth: user %s, password %s\n' %
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(user, passwd and '*' * len(passwd) or 'not set'))
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handlers.extend((httpbasicauthhandler(passmgr),
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|
httpdigestauthhandler(passmgr)))
|
|
handlers.extend([h(ui, passmgr) for h in handlerfuncs])
|
|
opener = urlreq.buildopener(*handlers)
|
|
|
|
# The user agent should should *NOT* be used by servers for e.g.
|
|
# protocol detection or feature negotiation: there are other
|
|
# facilities for that.
|
|
#
|
|
# "mercurial/proto-1.0" was the original user agent string and
|
|
# exists for backwards compatibility reasons.
|
|
#
|
|
# The "(Mercurial %s)" string contains the distribution
|
|
# name and version. Other client implementations should choose their
|
|
# own distribution name. Since servers should not be using the user
|
|
# agent string for anything, clients should be able to define whatever
|
|
# user agent they deem appropriate.
|
|
agent = 'mercurial/proto-1.0 (Mercurial %s)' % util.version()
|
|
opener.addheaders = [('User-agent', agent)]
|
|
opener.addheaders.append(('Accept', 'application/mercurial-0.1'))
|
|
return opener
|
|
|
|
def open(ui, url_, data=None):
|
|
u = util.url(url_)
|
|
if u.scheme:
|
|
u.scheme = u.scheme.lower()
|
|
url_, authinfo = u.authinfo()
|
|
else:
|
|
path = util.normpath(os.path.abspath(url_))
|
|
url_ = 'file://' + urlreq.pathname2url(path)
|
|
authinfo = None
|
|
return opener(ui, authinfo).open(url_, data)
|