""" IMAP repository support """ # Copyright (C) 2002-2019 John Goerzen & contributors # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA import os import netrc import errno from sys import exc_info from threading import Event from offlineimap import folder, imaputil, imapserver, OfflineImapError from offlineimap.repository.Base import BaseRepository from offlineimap.threadutil import ExitNotifyThread from offlineimap.utils.distro_utils import get_os_sslcertfile, \ get_os_sslcertfile_searchpath class IMAPRepository(BaseRepository): def __init__(self, reposname, account): self.idlefolders = None BaseRepository.__init__(self, reposname, account) # self.ui is being set by the BaseRepository self._host = None # Must be set before calling imapserver.IMAPServer(self) self.oauth2_request_url = None self.imapserver = imapserver.IMAPServer(self) self.folders = None self.copy_ignore_eval = None # Keep alive. self.kaevent = None self.kathread = None # Only set the newmail_hook in an IMAP repository. if self.config.has_option(self.getsection(), 'newmail_hook'): self.newmail_hook = self.localeval.eval( self.getconf('newmail_hook')) if self.getconf('sep', None): self.ui.info("The 'sep' setting is being ignored for IMAP " "repository '%s' (it's autodetected)" % self) def startkeepalive(self): keepalivetime = self.getkeepalive() if not keepalivetime: return self.kaevent = Event() self.kathread = ExitNotifyThread(target=self.imapserver.keepalive, name="Keep alive " + self.getname(), args=(keepalivetime, self.kaevent)) self.kathread.setDaemon(True) self.kathread.start() def stopkeepalive(self): if self.kaevent is None: return # Keepalive is not active. self.kaevent.set() self.kathread = None self.kaevent = None def holdordropconnections(self): if not self.getholdconnectionopen(): self.dropconnections() def dropconnections(self): self.imapserver.close() def get_copy_ignore_UIDs(self, foldername): """Return a list of UIDs to not copy for this foldername.""" if self.copy_ignore_eval is None: if self.config.has_option(self.getsection(), 'copy_ignore_eval'): self.copy_ignore_eval = self.localeval.eval( self.getconf('copy_ignore_eval')) else: self.copy_ignore_eval = lambda x: None return self.copy_ignore_eval(foldername) def getholdconnectionopen(self): if self.getidlefolders(): return True return self.getconfboolean("holdconnectionopen", False) def getkeepalive(self): num = self.getconfint("keepalive", 0) if num == 0 and self.getidlefolders(): return 29 * 60 return num def getsep(self): """Return the folder separator for the IMAP repository This requires that self.imapserver has been initialized with an acquireconnection() or it will still be `None`""" assert self.imapserver.delim is not None, "'%s' " \ "repository called getsep() before the folder separator was " \ "queried from the server" % self return self.imapserver.delim def gethost(self): """Return the configured hostname to connect to :returns: hostname as string or throws Exception""" if self._host: # Use cached value if possible. return self._host # 1) Check for remotehosteval setting. if self.config.has_option(self.getsection(), 'remotehosteval'): host = self.getconf('remotehosteval') try: host = self.localeval.eval(host) except Exception as e: raise OfflineImapError( "remotehosteval option for repository " "'%s' failed:\n%s" % (self, e), OfflineImapError.ERROR.REPO, exc_info()[2]) if host: self._host = host return self._host # 2) Check for plain remotehost setting. host = self.getconf('remotehost', None) if host is not None: self._host = host return self._host # No success. raise OfflineImapError("No remote host for repository " "'%s' specified." % self, OfflineImapError.ERROR.REPO) def get_remote_identity(self): """Remote identity is used for certain SASL mechanisms (currently -- PLAIN) to inform server about the ID we want to authorize as instead of our login name.""" identity = self.getconf('remote_identity', default=None) if identity is not None: identity = identity.encode('UTF-8') return identity def get_auth_mechanisms(self): supported = ["GSSAPI", "XOAUTH2", "CRAM-MD5", "PLAIN", "LOGIN"] # Mechanisms are ranged from the strongest to the # weakest ones. # TODO: we need DIGEST-MD5, it must come before CRAM-MD5 # due to the chosen-plaintext resistance. default = ["GSSAPI", "XOAUTH2", "CRAM-MD5", "PLAIN", "LOGIN"] mechs = self.getconflist('auth_mechanisms', r',\s*', default) for m in mechs: if m not in supported: raise OfflineImapError("Repository %s: " % self + "unknown authentication mechanism '%s'" % m, OfflineImapError.ERROR.REPO) self.ui.debug('imap', "Using authentication mechanisms %s" % mechs) return mechs def getuser(self): localeval = self.localeval if self.config.has_option(self.getsection(), 'remoteusereval'): user = self.getconf('remoteusereval') if user is not None: return localeval.eval(user).encode('UTF-8') if self.config.has_option(self.getsection(), 'remoteuser'): # Assume the configuration file to be UTF-8 encoded so we must not # encode this string again. user = self.getconf('remoteuser') if user is not None: return user try: netrcentry = netrc.netrc().authenticators(self.gethost()) except IOError as inst: if inst.errno != errno.ENOENT: raise else: if netrcentry: return netrcentry[0] try: netrcentry = netrc.netrc('/etc/netrc').authenticators(self.gethost()) except IOError as inst: if inst.errno not in (errno.ENOENT, errno.EACCES): raise else: if netrcentry: return netrcentry[0] def getport(self): port = None if self.config.has_option(self.getsection(), 'remoteporteval'): port = self.getconf('remoteporteval') if port is not None: return self.localeval.eval(port) return self.getconfint('remoteport', None) def getipv6(self): return self.getconfboolean('ipv6', None) def getssl(self): return self.getconfboolean('ssl', True) def getsslclientcert(self): xforms = [os.path.expanduser, os.path.expandvars, os.path.abspath] return self.getconf_xform('sslclientcert', xforms, None) def getsslclientkey(self): xforms = [os.path.expanduser, os.path.expandvars, os.path.abspath] return self.getconf_xform('sslclientkey', xforms, None) def getsslcacertfile(self): """Determines CA bundle. Returns path to the CA bundle. It is explicitely specified or requested via "OS-DEFAULT" value (and we will search known locations for the current OS and distribution). If it is not specified, we will search it in the known locations. If search route, via "OS-DEFAULT" or because is not specified, yields nothing, we will throw an exception to make our callers distinguish between not specified value and non-existent default CA bundle. It is also an error to specify non-existent file via configuration: it will error out later, but, perhaps, with less verbose explanation, so we will also throw an exception. It is consistent with the above behaviour, so any explicitely-requested configuration that doesn't result in an existing file will give an exception. """ xforms = [os.path.expanduser, os.path.expandvars, os.path.abspath] cacertfile = self.getconf_xform('sslcacertfile', xforms, None) # Can't use above cacertfile because of abspath. conf_sslacertfile = self.getconf('sslcacertfile', None) if conf_sslacertfile == "OS-DEFAULT" or \ conf_sslacertfile == None or \ conf_sslacertfile == '': cacertfile = get_os_sslcertfile() if cacertfile is None: searchpath = get_os_sslcertfile_searchpath() if searchpath: reason = "Default CA bundle was requested, " \ "but no existing locations available. " \ "Tried %s." % (", ".join(searchpath)) else: reason = "Default CA bundle was requested, " \ "but OfflineIMAP doesn't know any for your " \ "current operating system." raise OfflineImapError(reason, OfflineImapError.ERROR.REPO) if cacertfile is None: return None if not os.path.isfile(cacertfile): reason = "CA certfile for repository '%s' couldn't be found. " \ "No such file: '%s'" % (self.name, cacertfile) raise OfflineImapError(reason, OfflineImapError.ERROR.REPO) return cacertfile def gettlslevel(self): return self.getconf('tls_level', 'tls_compat') def getsslversion(self): return self.getconf('ssl_version', None) def getstarttls(self): return self.getconfboolean('starttls', True) def get_ssl_fingerprint(self): """Return array of possible certificate fingerprints. Configuration item cert_fingerprint can contain multiple comma-separated fingerprints in hex form.""" value = self.getconf('cert_fingerprint', "") return [f.strip().lower().replace(":", "") for f in value.split(',') if f] def setoauth2_request_url(self, url): self.oauth2_request_url = url def getoauth2_request_url(self): if self.oauth2_request_url is not None: # Use cached value if possible. return self.oauth2_request_url self.setoauth2_request_url(self.getconf('oauth2_request_url', None)) return self.oauth2_request_url def getoauth2_refresh_token(self): refresh_token = self.getconf('oauth2_refresh_token', None) if refresh_token is None: refresh_token = self.localeval.eval( self.getconf('oauth2_refresh_token_eval', "None") ) if refresh_token is not None: refresh_token = refresh_token.strip("\n") return refresh_token def getoauth2_access_token(self): access_token = self.getconf('oauth2_access_token', None) if access_token is None: access_token = self.localeval.eval( self.getconf('oauth2_access_token_eval', "None") ) if access_token is not None: access_token = access_token.strip("\n") return access_token def getoauth2_client_id(self): client_id = self.getconf('oauth2_client_id', None) if client_id is None: client_id = self.localeval.eval( self.getconf('oauth2_client_id_eval', "None") ) if client_id is not None: client_id = client_id.strip("\n") return client_id def getoauth2_client_secret(self): client_secret = self.getconf('oauth2_client_secret', None) if client_secret is None: client_secret = self.localeval.eval( self.getconf('oauth2_client_secret_eval', "None") ) if client_secret is not None: client_secret = client_secret.strip("\n") return client_secret def getpreauthtunnel(self): return self.getconf('preauthtunnel', None) def gettransporttunnel(self): return self.getconf('transporttunnel', None) def getreference(self): return self.getconf('reference', '""') def getdecodefoldernames(self): return self.getconfboolean('decodefoldernames', False) def getidlefolders(self): if self.idlefolders is None: self.idlefolders = self.localeval.eval( self.getconf('idlefolders', '[]') ) return self.idlefolders def getmaxconnections(self): num1 = len(self.getidlefolders()) num2 = self.getconfint('maxconnections', 1) return max(num1, num2) def getexpunge(self): return self.getconfboolean('expunge', True) def getpassword(self): """Return the IMAP password for this repository. It tries to get passwords in the following order: 1. evaluate Repository 'remotepasseval' 2. read password from Repository 'remotepass' 3. read password from file specified in Repository 'remotepassfile' 4. read password from ~/.netrc 5. read password from /etc/netrc On success we return the password. If all strategies fail we return None.""" # 1. Evaluate Repository 'remotepasseval'. passwd = self.getconf('remotepasseval', None) if passwd is not None: return self.localeval.eval(passwd).encode('utf-8') # 2. Read password from Repository 'remotepass'. password = self.getconf('remotepass', None) if password is not None: # Assume the configuration file to be UTF-8 encoded so we must not # encode this string again. return password # 3. Read password from file specified in Repository 'remotepassfile'. passfile = self.getconf('remotepassfile', None) if passfile is not None: fd = open(os.path.expanduser(passfile), 'r', 'utf-8') password = fd.readline().strip() fd.close() return password.encode('UTF-8') # 4. Read password from ~/.netrc. try: netrcentry = netrc.netrc().authenticators(self.gethost()) except IOError as inst: if inst.errno != errno.ENOENT: raise else: if netrcentry: user = self.getuser() if user is None or user == netrcentry[0]: return netrcentry[2] # 5. Read password from /etc/netrc. try: netrcentry = netrc.netrc('/etc/netrc').authenticators(self.gethost()) except IOError as inst: if inst.errno not in (errno.ENOENT, errno.EACCES): raise else: if netrcentry: user = self.getuser() if user is None or user == netrcentry[0]: return netrcentry[2] # No strategy yielded a password! return None def getfolder(self, foldername, decode=True): """Return instance of OfflineIMAP representative folder.""" return self.getfoldertype()(self.imapserver, foldername, self, decode) def getfoldertype(self): return folder.IMAP.IMAPFolder def connect(self): imapobj = self.imapserver.acquireconnection() self.imapserver.releaseconnection(imapobj) def forgetfolders(self): self.folders = None def getfolders(self): """Return a list of instances of OfflineIMAP representative folder.""" if self.folders is not None: return self.folders retval = [] imapobj = self.imapserver.acquireconnection() # check whether to list all folders, or subscribed only listfunction = imapobj.list if self.getconfboolean('subscribedonly', False): listfunction = imapobj.lsub try: result, listresult = listfunction(directory=self.imapserver.reference, pattern='"*"') if result != 'OK': raise OfflineImapError("Could not list the folders for" " repository %s. Server responded: %s" % (self.name, str(listresult)), OfflineImapError.ERROR.FOLDER) finally: self.imapserver.releaseconnection(imapobj) for s in listresult: if s is None or (isinstance(s, str) and s == ''): # Bug in imaplib: empty strings in results from # literals. TODO: still relevant? continue try: flags, delim, name = imaputil.imapsplit(s) except ValueError: self.ui.error( "could not correctly parse server response; got: %s" % s) raise flaglist = [x.lower() for x in imaputil.flagsplit(flags)] if '\\noselect' in flaglist: continue retval.append(self.getfoldertype()(self.imapserver, name, self)) # Add all folderincludes if len(self.folderincludes): imapobj = self.imapserver.acquireconnection() try: for foldername in self.folderincludes: try: imapobj.select(imaputil.utf8_IMAP(foldername), readonly=True) except OfflineImapError as e: # couldn't select this folderinclude, so ignore folder. if e.severity > OfflineImapError.ERROR.FOLDER: raise self.ui.error(e, exc_info()[2], 'Invalid folderinclude:') continue retval.append(self.getfoldertype()( self.imapserver, foldername, self, decode=False)) finally: self.imapserver.releaseconnection(imapobj) if self.foldersort is None: # default sorting by case insensitive transposed name retval.sort(key=lambda x: str.lower(x.getvisiblename())) else: # do foldersort in a python3-compatible way # http://bytes.com/topic/python/answers/844614-python-3-sorting-comparison-function def cmp2key(mycmp): """Converts a cmp= function into a key= function We need to keep cmp functions for backward compatibility""" class K: def __init__(self, obj, *args): self.obj = obj def __cmp__(self, other): return mycmp(self.obj.getvisiblename(), other.obj.getvisiblename()) return K retval.sort(key=cmp2key(self.foldersort)) self.folders = retval return self.folders def deletefolder(self, foldername): """Delete a folder on the IMAP server.""" if self.account.utf_8_support: foldername = imaputil.utf8_IMAP(foldername) imapobj = self.imapserver.acquireconnection() try: result = imapobj.delete(foldername) if result[0] != 'OK': raise OfflineImapError("Folder '%s'[%s] could not be deleted. " "Server responded: %s" % (foldername, self, str(result)), OfflineImapError.ERROR.FOLDER) finally: self.imapserver.releaseconnection(imapobj) def makefolder(self, foldername): """Create a folder on the IMAP server This will not update the list cached in :meth:`getfolders`. You will need to invoke :meth:`forgetfolders` to force new caching when you are done creating folders yourself. :param foldername: Full path of the folder to be created.""" if foldername == '': return if self.getreference() != '""': foldername = self.getreference() + self.getsep() + foldername if not foldername: # Create top level folder as folder separator. foldername = self.getsep() self.makefolder_single(foldername) return parts = foldername.split(self.getsep()) folder_paths = [self.getsep().join(parts[:n + 1]) for n in range(len(parts))] for folder_path in folder_paths: try: self.makefolder_single(folder_path) except OfflineImapError as e: if '[ALREADYEXISTS]' not in e.reason: raise def makefolder_single(self, foldername): self.ui.makefolder(self, foldername) if self.account.dryrun: return imapobj = self.imapserver.acquireconnection() try: if self.account.utf_8_support: foldername = imaputil.utf8_IMAP(foldername) result = imapobj.create(foldername) if result[0] != 'OK': raise OfflineImapError("Folder '%s'[%s] could not be created. " "Server responded: %s" % (foldername, self, str(result)), OfflineImapError.ERROR.FOLDER) finally: self.imapserver.releaseconnection(imapobj) class MappedIMAPRepository(IMAPRepository): def getfoldertype(self): return folder.UIDMaps.MappedIMAPFolder