仅当定义 受信任 代理的列表时，才可以使用该request.access_route属性。 __
该access_route属性使用X-Forwarded- Forheader，回退到REMOTE_ADDRWSGI变量；后者很好，因为您的服务器确定了这一点；在X-Forwarded- For可能已被几乎任何人都设定，但如果你信任的代理正确设置值，然后使用第一个（从端）成为 不 信任：
trusted_proxies = {'127.0.0.1'} # define your own set
route = request.access_route + [request.remote_addr]
remote_addr = next((addr for addr in reversed(route)
if addr not in trusted_proxies), request.remote_addr)
这样，即使有人用欺骗了X-Forwarded- For标头fake_ip1,fake_ip2，代理服务器也会添加,spoof_machine_ip到末尾，并且上面的代码会将设置remote_addr为spoof_machine_ip，无论最外面的代理服务器还有多少个受信任的代理。
这是您的链接文章所谈论的白名单方法（简短地说，就是Rails使用它），以及Zope在11年前实施的方法。
您的ProxyFix方法效果很好，但是您误解了它的作用。它 只是 套request.remote_addr; 该request.access_route属性不变（中间件 不 调整X-Forwarded-For头）。 但是 ，我会非常谨慎地盲目计算代理。
将相同的白名单方法应用于中间件如下所示：
class WhitelistRemoteAddrFix(object):
"""This middleware can be applied to add HTTP proxy support to an
application that was not designed with HTTP proxies in mind. It
only sets `REMOTE_ADDR` from `X-Forwarded` headers.
Tests proxies against a set of trusted proxies.
The original value of `REMOTE_ADDR` is stored in the WSGI environment
as `werkzeug.whitelist_remoteaddr_fix.orig_remote_addr`.
:param app: the WSGI application
:param trusted_proxies: a set or sequence of proxy ip addresses that can be trusted.
"""
def __init__(self, app, trusted_proxies=()):
self.app = app
self.trusted_proxies = frozenset(trusted_proxies)
def get_remote_addr(self, remote_addr, forwarded_for):
"""Selects the new remote addr from the given list of ips in
X-Forwarded-For. Picks first non-trusted ip address.
"""
if remote_addr in self.trusted_proxies:
return next((ip for ip in reversed(forwarded_for)
if ip not in self.trusted_proxies),
remote_addr)
def __call__(self, environ, start_response):
getter = environ.get
remote_addr = getter('REMOTE_ADDR')
forwarded_for = getter('HTTP_X_FORWARDED_FOR', '').split(',')
environ.update({
'werkzeug.whitelist_remoteaddr_fix.orig_remote_addr': remote_addr,
})
forwarded_for = [x for x in [x.strip() for x in forwarded_for] if x]
remote_addr = self.get_remote_addr(remote_addr, forwarded_for)
if remote_addr is not None:
environ['REMOTE_ADDR'] = remote_addr
return self.app(environ, start_response)
明确地说：该中间件也 只 设置request.remote_addr; request.access_route仍然不受影响。
602392714
清零编程群