0f45d89e34
In case we misconfigured a server name or are otherwise offline, a socket.gaierror will be raised when attempting to connect. We catch that case and raise an OfflineImapError with severity ERROR.REPO, meaning we should stop syncing this account and continue with the next one. Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de> Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
414 lines
18 KiB
Python
414 lines
18 KiB
Python
# IMAP server support
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# Copyright (C) 2002 - 2007 John Goerzen
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# <jgoerzen@complete.org>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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from offlineimap import imaplib2 as imaplib
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from offlineimap import imaplibutil, imaputil, threadutil, OfflineImapError
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from offlineimap.ui import getglobalui
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from threading import *
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import thread
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import time
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import hmac
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import socket
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import base64
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from StringIO import StringIO
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from platform import system
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from socket import gaierror
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try:
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# do we have a recent pykerberos?
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have_gss = False
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import kerberos
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if 'authGSSClientWrap' in dir(kerberos):
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have_gss = True
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except ImportError:
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pass
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class IMAPServer:
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GSS_STATE_STEP = 0
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GSS_STATE_WRAP = 1
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def __init__(self, config, reposname,
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username = None, password = None, hostname = None,
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port = None, ssl = 1, maxconnections = 1, tunnel = None,
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reference = '""', sslclientcert = None, sslclientkey = None,
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sslcacertfile= None):
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self.ui = getglobalui()
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self.reposname = reposname
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self.config = config
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self.username = username
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self.password = password
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self.passworderror = None
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self.goodpassword = None
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self.hostname = hostname
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self.tunnel = tunnel
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self.port = port
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self.usessl = ssl
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self.sslclientcert = sslclientcert
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self.sslclientkey = sslclientkey
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self.sslcacertfile = sslcacertfile
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self.delim = None
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self.root = None
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if port == None:
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if ssl:
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self.port = 993
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else:
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self.port = 143
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self.maxconnections = maxconnections
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self.availableconnections = []
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self.assignedconnections = []
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self.lastowner = {}
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self.semaphore = BoundedSemaphore(self.maxconnections)
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self.connectionlock = Lock()
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self.reference = reference
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self.gss_step = self.GSS_STATE_STEP
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self.gss_vc = None
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self.gssapi = False
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def getpassword(self):
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if self.goodpassword != None:
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return self.goodpassword
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if self.password != None and self.passworderror == None:
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return self.password
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self.password = self.ui.getpass(self.reposname,
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self.config,
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self.passworderror)
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self.passworderror = None
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return self.password
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def getdelim(self):
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"""Returns this server's folder delimiter. Can only be called
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after one or more calls to acquireconnection."""
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return self.delim
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def getroot(self):
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"""Returns this server's folder root. Can only be called after one
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or more calls to acquireconnection."""
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return self.root
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def releaseconnection(self, connection):
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"""Releases a connection, returning it to the pool."""
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self.connectionlock.acquire()
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self.assignedconnections.remove(connection)
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# Don't reuse broken connections
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if connection.Terminate:
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connection.logout()
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else:
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self.availableconnections.append(connection)
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self.connectionlock.release()
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self.semaphore.release()
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def md5handler(self, response):
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challenge = response.strip()
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self.ui.debug('imap', 'md5handler: got challenge %s' % challenge)
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passwd = self.getpassword()
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retval = self.username + ' ' + hmac.new(passwd, challenge).hexdigest()
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self.ui.debug('imap', 'md5handler: returning %s' % retval)
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return retval
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def plainauth(self, imapobj):
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self.ui.debug('imap', 'Attempting plain authentication')
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imapobj.login(self.username, self.getpassword())
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def gssauth(self, response):
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data = base64.b64encode(response)
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try:
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if self.gss_step == self.GSS_STATE_STEP:
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if not self.gss_vc:
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rc, self.gss_vc = kerberos.authGSSClientInit('imap@' +
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self.hostname)
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response = kerberos.authGSSClientResponse(self.gss_vc)
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rc = kerberos.authGSSClientStep(self.gss_vc, data)
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if rc != kerberos.AUTH_GSS_CONTINUE:
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self.gss_step = self.GSS_STATE_WRAP
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elif self.gss_step == self.GSS_STATE_WRAP:
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rc = kerberos.authGSSClientUnwrap(self.gss_vc, data)
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response = kerberos.authGSSClientResponse(self.gss_vc)
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rc = kerberos.authGSSClientWrap(self.gss_vc, response,
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self.username)
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response = kerberos.authGSSClientResponse(self.gss_vc)
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except kerberos.GSSError, err:
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# Kerberos errored out on us, respond with None to cancel the
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# authentication
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self.ui.debug('imap', '%s: %s' % (err[0][0], err[1][0]))
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return None
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if not response:
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response = ''
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return base64.b64decode(response)
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def acquireconnection(self):
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"""Fetches a connection from the pool, making sure to create a new one
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if needed, to obey the maximum connection limits, etc.
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Opens a connection to the server and returns an appropriate
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object."""
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self.semaphore.acquire()
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self.connectionlock.acquire()
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imapobj = None
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if len(self.availableconnections): # One is available.
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# Try to find one that previously belonged to this thread
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# as an optimization. Start from the back since that's where
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# they're popped on.
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threadid = thread.get_ident()
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imapobj = None
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for i in range(len(self.availableconnections) - 1, -1, -1):
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tryobj = self.availableconnections[i]
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if self.lastowner[tryobj] == threadid:
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imapobj = tryobj
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del(self.availableconnections[i])
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break
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if not imapobj:
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imapobj = self.availableconnections[0]
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del(self.availableconnections[0])
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self.assignedconnections.append(imapobj)
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self.lastowner[imapobj] = thread.get_ident()
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self.connectionlock.release()
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return imapobj
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self.connectionlock.release() # Release until need to modify data
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""" Must be careful here that if we fail we should bail out gracefully
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and release locks / threads so that the next attempt can try...
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"""
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success = 0
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try:
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while not success:
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# Generate a new connection.
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if self.tunnel:
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self.ui.connecting('tunnel', self.tunnel)
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imapobj = imaplibutil.IMAP4_Tunnel(self.tunnel,
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timeout=socket.getdefaulttimeout())
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success = 1
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elif self.usessl:
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self.ui.connecting(self.hostname, self.port)
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imapobj = imaplibutil.WrappedIMAP4_SSL(self.hostname, self.port,
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self.sslclientkey, self.sslclientcert,
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timeout=socket.getdefaulttimeout(),
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cacertfile = self.sslcacertfile)
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else:
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self.ui.connecting(self.hostname, self.port)
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imapobj = imaplibutil.WrappedIMAP4(self.hostname, self.port,
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timeout=socket.getdefaulttimeout())
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imapobj.mustquote = imaplibutil.mustquote
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if not self.tunnel:
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try:
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# Try GSSAPI and continue if it fails
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if 'AUTH=GSSAPI' in imapobj.capabilities and have_gss:
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self.ui.debug('imap',
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'Attempting GSSAPI authentication')
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try:
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imapobj.authenticate('GSSAPI', self.gssauth)
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except imapobj.error, val:
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self.gssapi = False
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self.ui.debug('imap',
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'GSSAPI Authentication failed')
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else:
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self.gssapi = True
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#if we do self.password = None then the next attempt cannot try...
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#self.password = None
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if not self.gssapi:
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if 'AUTH=CRAM-MD5' in imapobj.capabilities:
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self.ui.debug('imap',
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'Attempting CRAM-MD5 authentication')
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try:
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imapobj.authenticate('CRAM-MD5', self.md5handler)
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except imapobj.error, val:
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self.plainauth(imapobj)
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else:
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self.plainauth(imapobj)
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# Would bail by here if there was a failure.
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success = 1
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self.goodpassword = self.password
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except imapobj.error, val:
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self.passworderror = str(val)
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raise
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#self.password = None
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if self.delim == None:
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listres = imapobj.list(self.reference, '""')[1]
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if listres == [None] or listres == None:
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# Some buggy IMAP servers do not respond well to LIST "" ""
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# Work around them.
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listres = imapobj.list(self.reference, '"*"')[1]
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if listres == [None] or listres == None:
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# No Folders were returned. This occurs, e.g. if the
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# 'reference' prefix does not exist on the mail
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# server. Raise exception.
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err = "Server '%s' returned no folders in '%s'" % \
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(self.repos.getname(), self.reference)
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self.ui.warn(err)
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raise Exception(err)
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self.delim, self.root = \
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imaputil.imapsplit(listres[0])[1:]
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self.delim = imaputil.dequote(self.delim)
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self.root = imaputil.dequote(self.root)
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self.connectionlock.acquire()
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self.assignedconnections.append(imapobj)
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self.lastowner[imapobj] = thread.get_ident()
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self.connectionlock.release()
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return imapobj
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except Exception, e:
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"""If we are here then we did not succeed in getting a
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connection - we should clean up and then re-raise the
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error..."""
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self.semaphore.release()
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#Make sure that this can be retried the next time...
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self.passworderror = None
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if(self.connectionlock.locked()):
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self.connectionlock.release()
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if type(e) == gaierror:
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#DNS related errors. Abort Repo sync
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severity = OfflineImapError.ERROR.REPO
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#TODO: special error msg for e.errno == 2 "Name or service not known"?
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reason = "Could not resolve name '%s' for repository "\
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"'%s'. Make sure you have configured the ser"\
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"ver name correctly and that you are online."\
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% (self.hostname, self.reposname)
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raise OfflineImapError(reason, severity)
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else:
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# re-raise all other errors
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raise
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def connectionwait(self):
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"""Waits until there is a connection available. Note that between
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the time that a connection becomes available and the time it is
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requested, another thread may have grabbed it. This function is
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mainly present as a way to avoid spawning thousands of threads
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to copy messages, then have them all wait for 3 available connections.
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It's OK if we have maxconnections + 1 or 2 threads, which is what
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this will help us do."""
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threadutil.semaphorewait(self.semaphore)
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def close(self):
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# Make sure I own all the semaphores. Let the threads finish
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# their stuff. This is a blocking method.
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self.connectionlock.acquire()
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threadutil.semaphorereset(self.semaphore, self.maxconnections)
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for imapobj in self.assignedconnections + self.availableconnections:
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imapobj.logout()
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self.assignedconnections = []
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self.availableconnections = []
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self.lastowner = {}
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# reset kerberos state
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self.gss_step = self.GSS_STATE_STEP
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self.gss_vc = None
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self.gssapi = False
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self.connectionlock.release()
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def keepalive(self, timeout, event):
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"""Sends a NOOP to each connection recorded. It will wait a maximum
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of timeout seconds between doing this, and will continue to do so
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until the Event object as passed is true. This method is expected
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to be invoked in a separate thread, which should be join()'d after
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the event is set."""
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self.ui.debug('imap', 'keepalive thread started')
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while 1:
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self.ui.debug('imap', 'keepalive: top of loop')
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time.sleep(timeout)
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self.ui.debug('imap', 'keepalive: after wait')
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if event.isSet():
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self.ui.debug('imap', 'keepalive: event is set; exiting')
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return
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self.ui.debug('imap', 'keepalive: acquiring connectionlock')
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self.connectionlock.acquire()
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numconnections = len(self.assignedconnections) + \
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len(self.availableconnections)
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self.connectionlock.release()
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self.ui.debug('imap', 'keepalive: connectionlock released')
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threads = []
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imapobjs = []
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for i in range(numconnections):
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self.ui.debug('imap', 'keepalive: processing connection %d of %d' % (i, numconnections))
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imapobj = self.acquireconnection()
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self.ui.debug('imap', 'keepalive: connection %d acquired' % i)
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imapobjs.append(imapobj)
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thr = threadutil.ExitNotifyThread(target = imapobj.noop)
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thr.setDaemon(1)
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thr.start()
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threads.append(thr)
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self.ui.debug('imap', 'keepalive: thread started')
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self.ui.debug('imap', 'keepalive: joining threads')
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for thr in threads:
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# Make sure all the commands have completed.
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thr.join()
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self.ui.debug('imap', 'keepalive: releasing connections')
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for imapobj in imapobjs:
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self.releaseconnection(imapobj)
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self.ui.debug('imap', 'keepalive: bottom of loop')
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class ConfigedIMAPServer(IMAPServer):
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"""This class is designed for easier initialization given a ConfigParser
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object and an account name. The passwordhash is used if
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passwords for certain accounts are known. If the password for this
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account is listed, it will be obtained from there."""
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def __init__(self, repository, passwordhash = {}):
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"""Initialize the object. If the account is not a tunnel,
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the password is required."""
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self.repos = repository
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self.config = self.repos.getconfig()
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usetunnel = self.repos.getpreauthtunnel()
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if not usetunnel:
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host = self.repos.gethost()
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user = self.repos.getuser()
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port = self.repos.getport()
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ssl = self.repos.getssl()
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sslclientcert = self.repos.getsslclientcert()
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sslclientkey = self.repos.getsslclientkey()
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sslcacertfile = self.repos.getsslcacertfile()
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reference = self.repos.getreference()
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server = None
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password = None
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if repository.getname() in passwordhash:
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password = passwordhash[repository.getname()]
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# Connect to the remote server.
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if usetunnel:
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IMAPServer.__init__(self, self.config, self.repos.getname(),
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tunnel = usetunnel,
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reference = reference,
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maxconnections = self.repos.getmaxconnections())
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else:
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if not password:
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password = self.repos.getpassword()
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IMAPServer.__init__(self, self.config, self.repos.getname(),
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user, password, host, port, ssl,
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self.repos.getmaxconnections(),
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reference = reference,
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sslclientcert = sslclientcert,
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sslclientkey = sslclientkey,
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sslcacertfile = sslcacertfile)
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