当从专用NIC访问时,Rails将IP显示为127.0.0.1,但Nginx显示正确的IP.公共IP转发正常

Question

我们在Unicorn + Nginx上运行Rails应用程序.服务器有两个我们使用的NIC.eth0处理对公共互联网的eth2请求,并处理来自我们专用网络的请求.

当请求通过时eth0,nginx日志显示公共IP,Rails日志也显示此IP.但是,当请求通过时eth2,nginx日志会正确显示私有IP(例如192.168.5.134),但Rails日志会显示127.0.0.1.

因此,似乎公共请求正确设置eth0了X-Forwarded-For标头,但是对于请求没有发生这种情况eth2.

我们的nginx配置非常基本:

upstream example.com {
  server unix://var/www/example.com/shared/sockets/unicorn.socket fail_timeout=0;
}

...

server {
  listen 443 ssl;
  ...

  location @example.com  {
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_set_header X-Real_IP $remote_Addr;
    proxy_set_header X-Forwarded_For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;

    if ($host ~* "^(.+)\.example.com$") {
      set $subdomain $1;
    }

    proxy_pass http://example.com;
  }

有任何想法吗？

Answer 1

问题是Rails认为任何192.168.x.x地址都是私有地址,因此从X-Forwarded_For标题中删除它们.

# IP addresses that are "trusted proxies" that can be stripped from
# the comma-delimited list in the X-Forwarded-For header. See also:
# http://en.wikipedia.org/wiki/Private_network#Private_IPv4_address_spaces
TRUSTED_PROXIES = %r{
  ^127\.0\.0\.1$                | # localhost
  ^(10                          | # private IP 10.x.x.x
    172\.(1[6-9]|2[0-9]|3[0-1]) | # private IP in the range 172.16.0.0 .. 172.31.255.255
    192\.168                      # private IP 192.168.x.x
   )\.
}x

请在此处和此处查看相关的Rails源.

一种解决方案是将此添加到您的config/application.rb:

config.action_dispatch.trusted_proxies = /^127\.0\.0\.1$/ # localhost

这样,本地网络上的IP将不会被"127.0.0.1"替换.