mirror of
https://github.com/janeczku/calibre-web
synced 2024-11-17 15:24:53 +00:00
460 lines
18 KiB
Python
460 lines
18 KiB
Python
#!/usr/bin/env python
|
|
#
|
|
# Copyright 2011 Facebook
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
# not use this file except in compliance with the License. You may obtain
|
|
# a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
# License for the specific language governing permissions and limitations
|
|
# under the License.
|
|
|
|
"""Miscellaneous network utility code."""
|
|
|
|
from __future__ import absolute_import, division, print_function, with_statement
|
|
|
|
import errno
|
|
import os
|
|
import re
|
|
import socket
|
|
import ssl
|
|
import stat
|
|
|
|
from tornado.concurrent import dummy_executor, run_on_executor
|
|
from tornado.ioloop import IOLoop
|
|
from tornado.platform.auto import set_close_exec
|
|
from tornado.util import Configurable
|
|
|
|
|
|
def bind_sockets(port, address=None, family=socket.AF_UNSPEC, backlog=128, flags=None):
|
|
"""Creates listening sockets bound to the given port and address.
|
|
|
|
Returns a list of socket objects (multiple sockets are returned if
|
|
the given address maps to multiple IP addresses, which is most common
|
|
for mixed IPv4 and IPv6 use).
|
|
|
|
Address may be either an IP address or hostname. If it's a hostname,
|
|
the server will listen on all IP addresses associated with the
|
|
name. Address may be an empty string or None to listen on all
|
|
available interfaces. Family may be set to either `socket.AF_INET`
|
|
or `socket.AF_INET6` to restrict to IPv4 or IPv6 addresses, otherwise
|
|
both will be used if available.
|
|
|
|
The ``backlog`` argument has the same meaning as for
|
|
`socket.listen() <socket.socket.listen>`.
|
|
|
|
``flags`` is a bitmask of AI_* flags to `~socket.getaddrinfo`, like
|
|
``socket.AI_PASSIVE | socket.AI_NUMERICHOST``.
|
|
"""
|
|
sockets = []
|
|
if address == "":
|
|
address = None
|
|
if not socket.has_ipv6 and family == socket.AF_UNSPEC:
|
|
# Python can be compiled with --disable-ipv6, which causes
|
|
# operations on AF_INET6 sockets to fail, but does not
|
|
# automatically exclude those results from getaddrinfo
|
|
# results.
|
|
# http://bugs.python.org/issue16208
|
|
family = socket.AF_INET
|
|
if flags is None:
|
|
flags = socket.AI_PASSIVE
|
|
for res in set(socket.getaddrinfo(address, port, family, socket.SOCK_STREAM,
|
|
0, flags)):
|
|
af, socktype, proto, canonname, sockaddr = res
|
|
try:
|
|
sock = socket.socket(af, socktype, proto)
|
|
except socket.error as e:
|
|
if e.args[0] == errno.EAFNOSUPPORT:
|
|
continue
|
|
raise
|
|
set_close_exec(sock.fileno())
|
|
if os.name != 'nt':
|
|
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
|
|
if af == socket.AF_INET6:
|
|
# On linux, ipv6 sockets accept ipv4 too by default,
|
|
# but this makes it impossible to bind to both
|
|
# 0.0.0.0 in ipv4 and :: in ipv6. On other systems,
|
|
# separate sockets *must* be used to listen for both ipv4
|
|
# and ipv6. For consistency, always disable ipv4 on our
|
|
# ipv6 sockets and use a separate ipv4 socket when needed.
|
|
#
|
|
# Python 2.x on windows doesn't have IPPROTO_IPV6.
|
|
if hasattr(socket, "IPPROTO_IPV6"):
|
|
sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, 1)
|
|
sock.setblocking(0)
|
|
sock.bind(sockaddr)
|
|
sock.listen(backlog)
|
|
sockets.append(sock)
|
|
return sockets
|
|
|
|
if hasattr(socket, 'AF_UNIX'):
|
|
def bind_unix_socket(file, mode=0o600, backlog=128):
|
|
"""Creates a listening unix socket.
|
|
|
|
If a socket with the given name already exists, it will be deleted.
|
|
If any other file with that name exists, an exception will be
|
|
raised.
|
|
|
|
Returns a socket object (not a list of socket objects like
|
|
`bind_sockets`)
|
|
"""
|
|
sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
|
|
set_close_exec(sock.fileno())
|
|
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
|
|
sock.setblocking(0)
|
|
try:
|
|
st = os.stat(file)
|
|
except OSError as err:
|
|
if err.errno != errno.ENOENT:
|
|
raise
|
|
else:
|
|
if stat.S_ISSOCK(st.st_mode):
|
|
os.remove(file)
|
|
else:
|
|
raise ValueError("File %s exists and is not a socket", file)
|
|
sock.bind(file)
|
|
os.chmod(file, mode)
|
|
sock.listen(backlog)
|
|
return sock
|
|
|
|
|
|
def add_accept_handler(sock, callback, io_loop=None):
|
|
"""Adds an `.IOLoop` event handler to accept new connections on ``sock``.
|
|
|
|
When a connection is accepted, ``callback(connection, address)`` will
|
|
be run (``connection`` is a socket object, and ``address`` is the
|
|
address of the other end of the connection). Note that this signature
|
|
is different from the ``callback(fd, events)`` signature used for
|
|
`.IOLoop` handlers.
|
|
"""
|
|
if io_loop is None:
|
|
io_loop = IOLoop.current()
|
|
|
|
def accept_handler(fd, events):
|
|
while True:
|
|
try:
|
|
connection, address = sock.accept()
|
|
except socket.error as e:
|
|
# EWOULDBLOCK and EAGAIN indicate we have accepted every
|
|
# connection that is available.
|
|
if e.args[0] in (errno.EWOULDBLOCK, errno.EAGAIN):
|
|
return
|
|
# ECONNABORTED indicates that there was a connection
|
|
# but it was closed while still in the accept queue.
|
|
# (observed on FreeBSD).
|
|
if e.args[0] == errno.ECONNABORTED:
|
|
continue
|
|
raise
|
|
callback(connection, address)
|
|
io_loop.add_handler(sock.fileno(), accept_handler, IOLoop.READ)
|
|
|
|
|
|
def is_valid_ip(ip):
|
|
"""Returns true if the given string is a well-formed IP address.
|
|
|
|
Supports IPv4 and IPv6.
|
|
"""
|
|
try:
|
|
res = socket.getaddrinfo(ip, 0, socket.AF_UNSPEC,
|
|
socket.SOCK_STREAM,
|
|
0, socket.AI_NUMERICHOST)
|
|
return bool(res)
|
|
except socket.gaierror as e:
|
|
if e.args[0] == socket.EAI_NONAME:
|
|
return False
|
|
raise
|
|
return True
|
|
|
|
|
|
class Resolver(Configurable):
|
|
"""Configurable asynchronous DNS resolver interface.
|
|
|
|
By default, a blocking implementation is used (which simply calls
|
|
`socket.getaddrinfo`). An alternative implementation can be
|
|
chosen with the `Resolver.configure <.Configurable.configure>`
|
|
class method::
|
|
|
|
Resolver.configure('tornado.netutil.ThreadedResolver')
|
|
|
|
The implementations of this interface included with Tornado are
|
|
|
|
* `tornado.netutil.BlockingResolver`
|
|
* `tornado.netutil.ThreadedResolver`
|
|
* `tornado.netutil.OverrideResolver`
|
|
* `tornado.platform.twisted.TwistedResolver`
|
|
* `tornado.platform.caresresolver.CaresResolver`
|
|
"""
|
|
@classmethod
|
|
def configurable_base(cls):
|
|
return Resolver
|
|
|
|
@classmethod
|
|
def configurable_default(cls):
|
|
return BlockingResolver
|
|
|
|
def resolve(self, host, port, family=socket.AF_UNSPEC, callback=None):
|
|
"""Resolves an address.
|
|
|
|
The ``host`` argument is a string which may be a hostname or a
|
|
literal IP address.
|
|
|
|
Returns a `.Future` whose result is a list of (family,
|
|
address) pairs, where address is a tuple suitable to pass to
|
|
`socket.connect <socket.socket.connect>` (i.e. a ``(host,
|
|
port)`` pair for IPv4; additional fields may be present for
|
|
IPv6). If a ``callback`` is passed, it will be run with the
|
|
result as an argument when it is complete.
|
|
"""
|
|
raise NotImplementedError()
|
|
|
|
def close(self):
|
|
"""Closes the `Resolver`, freeing any resources used.
|
|
|
|
.. versionadded:: 3.1
|
|
|
|
"""
|
|
pass
|
|
|
|
|
|
class ExecutorResolver(Resolver):
|
|
"""Resolver implementation using a `concurrent.futures.Executor`.
|
|
|
|
Use this instead of `ThreadedResolver` when you require additional
|
|
control over the executor being used.
|
|
|
|
The executor will be shut down when the resolver is closed unless
|
|
``close_resolver=False``; use this if you want to reuse the same
|
|
executor elsewhere.
|
|
"""
|
|
def initialize(self, io_loop=None, executor=None, close_executor=True):
|
|
self.io_loop = io_loop or IOLoop.current()
|
|
if executor is not None:
|
|
self.executor = executor
|
|
self.close_executor = close_executor
|
|
else:
|
|
self.executor = dummy_executor
|
|
self.close_executor = False
|
|
|
|
def close(self):
|
|
if self.close_executor:
|
|
self.executor.shutdown()
|
|
self.executor = None
|
|
|
|
@run_on_executor
|
|
def resolve(self, host, port, family=socket.AF_UNSPEC):
|
|
# On Solaris, getaddrinfo fails if the given port is not found
|
|
# in /etc/services and no socket type is given, so we must pass
|
|
# one here. The socket type used here doesn't seem to actually
|
|
# matter (we discard the one we get back in the results),
|
|
# so the addresses we return should still be usable with SOCK_DGRAM.
|
|
addrinfo = socket.getaddrinfo(host, port, family, socket.SOCK_STREAM)
|
|
results = []
|
|
for family, socktype, proto, canonname, address in addrinfo:
|
|
results.append((family, address))
|
|
return results
|
|
|
|
|
|
class BlockingResolver(ExecutorResolver):
|
|
"""Default `Resolver` implementation, using `socket.getaddrinfo`.
|
|
|
|
The `.IOLoop` will be blocked during the resolution, although the
|
|
callback will not be run until the next `.IOLoop` iteration.
|
|
"""
|
|
def initialize(self, io_loop=None):
|
|
super(BlockingResolver, self).initialize(io_loop=io_loop)
|
|
|
|
|
|
class ThreadedResolver(ExecutorResolver):
|
|
"""Multithreaded non-blocking `Resolver` implementation.
|
|
|
|
Requires the `concurrent.futures` package to be installed
|
|
(available in the standard library since Python 3.2,
|
|
installable with ``pip install futures`` in older versions).
|
|
|
|
The thread pool size can be configured with::
|
|
|
|
Resolver.configure('tornado.netutil.ThreadedResolver',
|
|
num_threads=10)
|
|
|
|
.. versionchanged:: 3.1
|
|
All ``ThreadedResolvers`` share a single thread pool, whose
|
|
size is set by the first one to be created.
|
|
"""
|
|
_threadpool = None
|
|
_threadpool_pid = None
|
|
|
|
def initialize(self, io_loop=None, num_threads=10):
|
|
threadpool = ThreadedResolver._create_threadpool(num_threads)
|
|
super(ThreadedResolver, self).initialize(
|
|
io_loop=io_loop, executor=threadpool, close_executor=False)
|
|
|
|
@classmethod
|
|
def _create_threadpool(cls, num_threads):
|
|
pid = os.getpid()
|
|
if cls._threadpool_pid != pid:
|
|
# Threads cannot survive after a fork, so if our pid isn't what it
|
|
# was when we created the pool then delete it.
|
|
cls._threadpool = None
|
|
if cls._threadpool is None:
|
|
from concurrent.futures import ThreadPoolExecutor
|
|
cls._threadpool = ThreadPoolExecutor(num_threads)
|
|
cls._threadpool_pid = pid
|
|
return cls._threadpool
|
|
|
|
|
|
class OverrideResolver(Resolver):
|
|
"""Wraps a resolver with a mapping of overrides.
|
|
|
|
This can be used to make local DNS changes (e.g. for testing)
|
|
without modifying system-wide settings.
|
|
|
|
The mapping can contain either host strings or host-port pairs.
|
|
"""
|
|
def initialize(self, resolver, mapping):
|
|
self.resolver = resolver
|
|
self.mapping = mapping
|
|
|
|
def close(self):
|
|
self.resolver.close()
|
|
|
|
def resolve(self, host, port, *args, **kwargs):
|
|
if (host, port) in self.mapping:
|
|
host, port = self.mapping[(host, port)]
|
|
elif host in self.mapping:
|
|
host = self.mapping[host]
|
|
return self.resolver.resolve(host, port, *args, **kwargs)
|
|
|
|
|
|
# These are the keyword arguments to ssl.wrap_socket that must be translated
|
|
# to their SSLContext equivalents (the other arguments are still passed
|
|
# to SSLContext.wrap_socket).
|
|
_SSL_CONTEXT_KEYWORDS = frozenset(['ssl_version', 'certfile', 'keyfile',
|
|
'cert_reqs', 'ca_certs', 'ciphers'])
|
|
|
|
|
|
def ssl_options_to_context(ssl_options):
|
|
"""Try to convert an ``ssl_options`` dictionary to an
|
|
`~ssl.SSLContext` object.
|
|
|
|
The ``ssl_options`` dictionary contains keywords to be passed to
|
|
`ssl.wrap_socket`. In Python 3.2+, `ssl.SSLContext` objects can
|
|
be used instead. This function converts the dict form to its
|
|
`~ssl.SSLContext` equivalent, and may be used when a component which
|
|
accepts both forms needs to upgrade to the `~ssl.SSLContext` version
|
|
to use features like SNI or NPN.
|
|
"""
|
|
if isinstance(ssl_options, dict):
|
|
assert all(k in _SSL_CONTEXT_KEYWORDS for k in ssl_options), ssl_options
|
|
if (not hasattr(ssl, 'SSLContext') or
|
|
isinstance(ssl_options, ssl.SSLContext)):
|
|
return ssl_options
|
|
context = ssl.SSLContext(
|
|
ssl_options.get('ssl_version', ssl.PROTOCOL_SSLv23))
|
|
if 'certfile' in ssl_options:
|
|
context.load_cert_chain(ssl_options['certfile'], ssl_options.get('keyfile', None))
|
|
if 'cert_reqs' in ssl_options:
|
|
context.verify_mode = ssl_options['cert_reqs']
|
|
if 'ca_certs' in ssl_options:
|
|
context.load_verify_locations(ssl_options['ca_certs'])
|
|
if 'ciphers' in ssl_options:
|
|
context.set_ciphers(ssl_options['ciphers'])
|
|
return context
|
|
|
|
|
|
def ssl_wrap_socket(socket, ssl_options, server_hostname=None, **kwargs):
|
|
"""Returns an ``ssl.SSLSocket`` wrapping the given socket.
|
|
|
|
``ssl_options`` may be either a dictionary (as accepted by
|
|
`ssl_options_to_context`) or an `ssl.SSLContext` object.
|
|
Additional keyword arguments are passed to ``wrap_socket``
|
|
(either the `~ssl.SSLContext` method or the `ssl` module function
|
|
as appropriate).
|
|
"""
|
|
context = ssl_options_to_context(ssl_options)
|
|
if hasattr(ssl, 'SSLContext') and isinstance(context, ssl.SSLContext):
|
|
if server_hostname is not None and getattr(ssl, 'HAS_SNI'):
|
|
# Python doesn't have server-side SNI support so we can't
|
|
# really unittest this, but it can be manually tested with
|
|
# python3.2 -m tornado.httpclient https://sni.velox.ch
|
|
return context.wrap_socket(socket, server_hostname=server_hostname,
|
|
**kwargs)
|
|
else:
|
|
return context.wrap_socket(socket, **kwargs)
|
|
else:
|
|
return ssl.wrap_socket(socket, **dict(context, **kwargs))
|
|
|
|
if hasattr(ssl, 'match_hostname') and hasattr(ssl, 'CertificateError'): # python 3.2+
|
|
ssl_match_hostname = ssl.match_hostname
|
|
SSLCertificateError = ssl.CertificateError
|
|
else:
|
|
# match_hostname was added to the standard library ssl module in python 3.2.
|
|
# The following code was backported for older releases and copied from
|
|
# https://bitbucket.org/brandon/backports.ssl_match_hostname
|
|
class SSLCertificateError(ValueError):
|
|
pass
|
|
|
|
def _dnsname_to_pat(dn, max_wildcards=1):
|
|
pats = []
|
|
for frag in dn.split(r'.'):
|
|
if frag.count('*') > max_wildcards:
|
|
# Issue #17980: avoid denials of service by refusing more
|
|
# than one wildcard per fragment. A survery of established
|
|
# policy among SSL implementations showed it to be a
|
|
# reasonable choice.
|
|
raise SSLCertificateError(
|
|
"too many wildcards in certificate DNS name: " + repr(dn))
|
|
if frag == '*':
|
|
# When '*' is a fragment by itself, it matches a non-empty dotless
|
|
# fragment.
|
|
pats.append('[^.]+')
|
|
else:
|
|
# Otherwise, '*' matches any dotless fragment.
|
|
frag = re.escape(frag)
|
|
pats.append(frag.replace(r'\*', '[^.]*'))
|
|
return re.compile(r'\A' + r'\.'.join(pats) + r'\Z', re.IGNORECASE)
|
|
|
|
def ssl_match_hostname(cert, hostname):
|
|
"""Verify that *cert* (in decoded format as returned by
|
|
SSLSocket.getpeercert()) matches the *hostname*. RFC 2818 rules
|
|
are mostly followed, but IP addresses are not accepted for *hostname*.
|
|
|
|
CertificateError is raised on failure. On success, the function
|
|
returns nothing.
|
|
"""
|
|
if not cert:
|
|
raise ValueError("empty or no certificate")
|
|
dnsnames = []
|
|
san = cert.get('subjectAltName', ())
|
|
for key, value in san:
|
|
if key == 'DNS':
|
|
if _dnsname_to_pat(value).match(hostname):
|
|
return
|
|
dnsnames.append(value)
|
|
if not dnsnames:
|
|
# The subject is only checked when there is no dNSName entry
|
|
# in subjectAltName
|
|
for sub in cert.get('subject', ()):
|
|
for key, value in sub:
|
|
# XXX according to RFC 2818, the most specific Common Name
|
|
# must be used.
|
|
if key == 'commonName':
|
|
if _dnsname_to_pat(value).match(hostname):
|
|
return
|
|
dnsnames.append(value)
|
|
if len(dnsnames) > 1:
|
|
raise SSLCertificateError("hostname %r "
|
|
"doesn't match either of %s"
|
|
% (hostname, ', '.join(map(repr, dnsnames))))
|
|
elif len(dnsnames) == 1:
|
|
raise SSLCertificateError("hostname %r "
|
|
"doesn't match %r"
|
|
% (hostname, dnsnames[0]))
|
|
else:
|
|
raise SSLCertificateError("no appropriate commonName or "
|
|
"subjectAltName fields were found")
|