/usr/share/pyshared/allmydata/frontends/ftpd.py is in tahoe-lafs 1.9.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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from twisted.application import service, strports
from twisted.internet import defer
from twisted.internet.interfaces import IConsumer
from twisted.cred import portal
from twisted.protocols import ftp
from allmydata.interfaces import IDirectoryNode, ExistingChildError, \
NoSuchChildError
from allmydata.immutable.upload import FileHandle
from allmydata.util.fileutil import EncryptedTemporaryFile
class ReadFile:
implements(ftp.IReadFile)
def __init__(self, node):
self.node = node
def send(self, consumer):
d = self.node.read(consumer)
return d # when consumed
class FileWriter:
implements(IConsumer)
def registerProducer(self, producer, streaming):
if not streaming:
raise NotImplementedError("Non-streaming producer not supported.")
# we write the data to a temporary file, since Tahoe can't do
# streaming upload yet.
self.f = EncryptedTemporaryFile()
return None
def unregisterProducer(self):
# the upload actually happens in WriteFile.close()
pass
def write(self, data):
self.f.write(data)
class WriteFile:
implements(ftp.IWriteFile)
def __init__(self, parent, childname, convergence):
self.parent = parent
self.childname = childname
self.convergence = convergence
def receive(self):
self.c = FileWriter()
return defer.succeed(self.c)
def close(self):
u = FileHandle(self.c.f, self.convergence)
d = self.parent.add_file(self.childname, u)
return d
class NoParentError(Exception):
pass
class Handler:
implements(ftp.IFTPShell)
def __init__(self, client, rootnode, username, convergence):
self.client = client
self.root = rootnode
self.username = username
self.convergence = convergence
def makeDirectory(self, path):
d = self._get_root(path)
d.addCallback(lambda (root,path):
self._get_or_create_directories(root, path))
return d
def _get_or_create_directories(self, node, path):
if not IDirectoryNode.providedBy(node):
# unfortunately it is too late to provide the name of the
# blocking directory in the error message.
raise ftp.FileExistsError("cannot create directory because there "
"is a file in the way")
if not path:
return defer.succeed(node)
d = node.get(path[0])
def _maybe_create(f):
f.trap(NoSuchChildError)
return node.create_subdirectory(path[0])
d.addErrback(_maybe_create)
d.addCallback(self._get_or_create_directories, path[1:])
return d
def _get_parent(self, path):
# fire with (parentnode, childname)
path = [unicode(p) for p in path]
if not path:
raise NoParentError
childname = path[-1]
d = self._get_root(path)
def _got_root((root, path)):
if not path:
raise NoParentError
return root.get_child_at_path(path[:-1])
d.addCallback(_got_root)
def _got_parent(parent):
return (parent, childname)
d.addCallback(_got_parent)
return d
def _remove_thing(self, path, must_be_directory=False, must_be_file=False):
d = defer.maybeDeferred(self._get_parent, path)
def _convert_error(f):
f.trap(NoParentError)
raise ftp.PermissionDeniedError("cannot delete root directory")
d.addErrback(_convert_error)
def _got_parent( (parent, childname) ):
d = parent.get(childname)
def _got_child(child):
if must_be_directory and not IDirectoryNode.providedBy(child):
raise ftp.IsNotADirectoryError("rmdir called on a file")
if must_be_file and IDirectoryNode.providedBy(child):
raise ftp.IsADirectoryError("rmfile called on a directory")
return parent.delete(childname)
d.addCallback(_got_child)
d.addErrback(self._convert_error)
return d
d.addCallback(_got_parent)
return d
def removeDirectory(self, path):
return self._remove_thing(path, must_be_directory=True)
def removeFile(self, path):
return self._remove_thing(path, must_be_file=True)
def rename(self, fromPath, toPath):
# the target directory must already exist
d = self._get_parent(fromPath)
def _got_from_parent( (fromparent, childname) ):
d = self._get_parent(toPath)
d.addCallback(lambda (toparent, tochildname):
fromparent.move_child_to(childname,
toparent, tochildname,
overwrite=False))
return d
d.addCallback(_got_from_parent)
d.addErrback(self._convert_error)
return d
def access(self, path):
# we allow access to everything that exists. We are required to raise
# an error for paths that don't exist: FTP clients (at least ncftp)
# uses this to decide whether to mkdir or not.
d = self._get_node_and_metadata_for_path(path)
d.addErrback(self._convert_error)
d.addCallback(lambda res: None)
return d
def _convert_error(self, f):
if f.check(NoSuchChildError):
childname = f.value.args[0].encode("utf-8")
msg = "'%s' doesn't exist" % childname
raise ftp.FileNotFoundError(msg)
if f.check(ExistingChildError):
msg = f.value.args[0].encode("utf-8")
raise ftp.FileExistsError(msg)
return f
def _get_root(self, path):
# return (root, remaining_path)
path = [unicode(p) for p in path]
if path and path[0] == "uri":
d = defer.maybeDeferred(self.client.create_node_from_uri,
str(path[1]))
d.addCallback(lambda root: (root, path[2:]))
else:
d = defer.succeed((self.root,path))
return d
def _get_node_and_metadata_for_path(self, path):
d = self._get_root(path)
def _got_root((root,path)):
if path:
return root.get_child_and_metadata_at_path(path)
else:
return (root,{})
d.addCallback(_got_root)
return d
def _populate_row(self, keys, (childnode, metadata)):
values = []
isdir = bool(IDirectoryNode.providedBy(childnode))
for key in keys:
if key == "size":
if isdir:
value = 0
else:
value = childnode.get_size() or 0
elif key == "directory":
value = isdir
elif key == "permissions":
value = 0600
elif key == "hardlinks":
value = 1
elif key == "modified":
# follow sftpd convention (i.e. linkmotime in preference to mtime)
if "linkmotime" in metadata.get("tahoe", {}):
value = metadata["tahoe"]["linkmotime"]
else:
value = metadata.get("mtime", 0)
elif key == "owner":
value = self.username
elif key == "group":
value = self.username
else:
value = "??"
values.append(value)
return values
def stat(self, path, keys=()):
# for files only, I think
d = self._get_node_and_metadata_for_path(path)
def _render((node,metadata)):
assert not IDirectoryNode.providedBy(node)
return self._populate_row(keys, (node,metadata))
d.addCallback(_render)
d.addErrback(self._convert_error)
return d
def list(self, path, keys=()):
# the interface claims that path is a list of unicodes, but in
# practice it is not
d = self._get_node_and_metadata_for_path(path)
def _list((node, metadata)):
if IDirectoryNode.providedBy(node):
return node.list()
return { path[-1]: (node, metadata) } # need last-edge metadata
d.addCallback(_list)
def _render(children):
results = []
for (name, childnode) in children.iteritems():
# the interface claims that the result should have a unicode
# object as the name, but it fails unless you give it a
# bytestring
results.append( (name.encode("utf-8"),
self._populate_row(keys, childnode) ) )
return results
d.addCallback(_render)
d.addErrback(self._convert_error)
return d
def openForReading(self, path):
d = self._get_node_and_metadata_for_path(path)
d.addCallback(lambda (node,metadata): ReadFile(node))
d.addErrback(self._convert_error)
return d
def openForWriting(self, path):
path = [unicode(p) for p in path]
if not path:
raise ftp.PermissionDeniedError("cannot STOR to root directory")
childname = path[-1]
d = self._get_root(path)
def _got_root((root, path)):
if not path:
raise ftp.PermissionDeniedError("cannot STOR to root directory")
return root.get_child_at_path(path[:-1])
d.addCallback(_got_root)
def _got_parent(parent):
return WriteFile(parent, childname, self.convergence)
d.addCallback(_got_parent)
return d
from allmydata.frontends.auth import AccountURLChecker, AccountFileChecker, NeedRootcapLookupScheme
class Dispatcher:
implements(portal.IRealm)
def __init__(self, client):
self.client = client
def requestAvatar(self, avatarID, mind, interface):
assert interface == ftp.IFTPShell
rootnode = self.client.create_node_from_uri(avatarID.rootcap)
convergence = self.client.convergence
s = Handler(self.client, rootnode, avatarID.username, convergence)
def logout(): pass
return (interface, s, None)
class FTPServer(service.MultiService):
def __init__(self, client, accountfile, accounturl, ftp_portstr):
service.MultiService.__init__(self)
r = Dispatcher(client)
p = portal.Portal(r)
if accountfile:
c = AccountFileChecker(self, accountfile)
p.registerChecker(c)
if accounturl:
c = AccountURLChecker(self, accounturl)
p.registerChecker(c)
if not accountfile and not accounturl:
# we could leave this anonymous, with just the /uri/CAP form
raise NeedRootcapLookupScheme("must provide some translation")
f = ftp.FTPFactory(p)
s = strports.service(ftp_portstr, f)
s.setServiceParent(self)
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