☰

更新

tag-icon • tag-icon squid bridge openbsd transparent-proxy pf
更新

我想使用 OpenBSD 5.7 作为路由器前面的过滤桥，并作为其中的一部分运行透明代理 (squid 3.5.1) 来管理 Web 访问。我已将 openbsd 机器设置为桥接器，并且运行正常。但是，我无法让 pf 将 Web 流量转移到 squid。

这就是我的网络的样子

[Internet]
      |
      |
[OpenBSD]
      |
      |
  [       (Router)     ]
     |                 |
     |                 |
 [Wired Workstations]   [Wi-Fi]

如果我将 OpenBSD 计算机连接到我的网络并手动配置工作站以将其用作代理，则 Squid 可以正常工作。我在 Squid 配置中进行了以下配置以启用透明拦截

http_port 127.0.0.1:3129 tproxy

这是我的 pf 配置：

# internet facing
ext_if = "em1"

# internal facing
int_if = "em0"

#scrub provides a measure of protection against certain kinds of attacks based on incorrect handling of packet fragments
match in all scrub (no-df max-mss 1440)

# Prevent spoofing
antispoof log for $ext_if label "antispoof"

# Block anything coming form source we have no back routes for
block in log from no-route to any label "no back route"

# Proxy http
pass in quick on $int_if inet proto tcp to port www divert-to 127.0.0.1 port 3129
pass out quick from 127.0.0.1 divert-reply

pass in on $int_if
pass out on $int_if

pass in on $ext_if
pass out on $ext_if

有人知道为什么我的转移规则不起作用吗？我查看了日志

pass in quick on em0 inet proto tcp from any to any port = 80 flags S/SA divert-to 127.0.0.1 port 3129
  [ Evaluations: 36248     Packets: 544       Bytes: 355122      States: 29    ]
  [ Inserted: uid 0 pid 15666 State Creations: 29    ]

将快速 inet 从 127.0.0.1 传递到任何标志 S/SA divert-reply [评估：72399 数据包：0 字节：0 状态：0] [插入：uid 0 pid 15666 状态创建：0]

我可以看到规则“有效”，但是 squid 日志中没有显示任何内容，我仍然可以访问网站。这基本上是 squid 推荐的规则。我尝试使用此规则

pass in log quick on $int_if inet proto tcp from any to any port www rdr-to 127.0.0.1 port 3129

当我使用这个时，我看到规则重定向发生了，但是 squid 日志中没有显示任何内容。网站请求也超时了。

pass in log quick on em0 inet proto tcp from any to any port = 80 flags     S/SA rdr-to 127.0.0.1 port 3129
  [ Evaluations: 25213     Packets: 8         Bytes: 496         States: 1     ]

这是 ifconfig 的输出

是否配置

lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 32768
    priority: 0
    groups: lo
    inet6 fe80::1%lo0 prefixlen 64 scopeid 0x4
    inet6 ::1 prefixlen 128
    inet 127.0.0.1 netmask 0xff000000
em0: flags=8b43<UP,BROADCAST,RUNNING,PROMISC,ALLMULTI,SIMPLEX,MULTICAST> mtu 1500
    lladdr 00:e8:4c:68:1a:f1
    priority: 0
    groups: egress
    media: Ethernet autoselect (1000baseT full-duplex,rxpause,txpause)
    status: active
em1: flags=8b43<UP,BROADCAST,RUNNING,PROMISC,ALLMULTI,SIMPLEX,MULTICAST> mtu 1500
    lladdr 00:e8:4c:68:1a:f2
    priority: 0
    media: Ethernet autoselect (100baseTX full-duplex,rxpause,txpause)
    status: active
enc0: flags=0<>
    priority: 0
    groups: enc
    status: active
bridge0: flags=41<UP,RUNNING>
    groups: bridge
    priority 32768 hellotime 2 fwddelay 15 maxage 20 holdcnt 6 proto rstp
    em0 flags=7<LEARNING,DISCOVER,BLOCKNONIP>
            port 1 ifpriority 0 ifcost 0
    em1 flags=7<LEARNING,DISCOVER,BLOCKNONIP>
            port 2 ifpriority 0 ifcost 0
pflog0: flags=141<UP,RUNNING,PROMISC> mtu 33144
    priority: 0
    groups: pflog

我该如何让它工作？我的 pf 规则有什么问题？

更新

这有点奇怪

如果我使用

pass in quick log on $int_if inet proto tcp to port 80 divert-to 127.0.0.1 port 3129
pass out quick log from 127.0.0.1 divert-reply

我在日志中得到以下内容：

rule 3/(match) pass in on em0: 233.297.39.227.32880 > 153.94.152.119.87: S 2656450467:2656450467(0) win 65535 <mss 1460,nop,wscale 5,nop,nop,timestamp 605332037 0,[|tcp]> (DF)

如果我将其改为

pass in quick log on $int_if inet proto tcp to port 80 rdr-to 127.0.0.1 port 3129
pass out quick log from 127.0.0.1 divert-reply

我在日志中看到以下内容，但在 squid 日志中没有显示任何内容，并且不出所料，对网站的请求超时了

rule 3/(match) pass in on em0: 233.297.39.227.39091 > 127.0.0.1.3129: S 409217949:409217949(0) win 65535 <mss 1460,nop,wscale 5,nop,nop,timestamp 605394683 0,[|tcp]> (DF)

答案1

如果你有 OpenBSD4.1 或 4.3， 你必须做 ：

rdr pass inet proto tcp from 192.168.231.0/24 to any port 80 -> 192.168.231.1 port 3129

block in
pass in quick on $int_if
pass in quick on $wi_if
pass out keep state

如果你有OpenBSD 4.4 或更高版本你必须做 ：

set skip on $int_if
set skip on $wi_if
IPv6:

pass in quick inet6 proto tcp from 2001:DB8::/32 to port www divert-to ::1 port 3129
pass out quick inet6 from 2001:DB8::/32 divert-reply
IPv4:
pass in quick on inet proto tcp from 192.0.2.0/24 to port www divert-to 127.0.0.1 port 3129
pass out quick inet from 192.0.2.0/24 divert-reply

更新：

当然，您需要根据您的界面进行一些更改。

相关内容