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Accepted
Nyxynyx
Asked: 2014-02-19 00:05:05 +0800 CST

安装 postfix 后无法关闭 25 端口

  • 772

在 Ubuntu 12.04 上安装logwatch（安装postfix）之前，端口 25 被iptables/阻止csf

PORT   STATE    SERVICE
25/tcp filtered smtp

安装 logwatch（安装 postfix）后，现在打开 25 端口

PORT   STATE SERVICE
25/tcp open  smtp

使用重新启动 CSF，csf -r但端口保持打开状态。TCP_ON除了, TCP_OUT, UDP_IN,中定义的端口之外，不是所有端口都默认被阻止UDP_OUT吗？为什么 25 端口仍然开放？

csf.conf

TCP_IN = "22,27017,27018,27019"
TCP_OUT = "53,27017,27018,27019"

UDP_IN = ""
UDP_OUT = "53,123"

sudo netstat -tnlp | grep：25

tcp        0      0 0.0.0.0:25              0.0.0.0:*               LISTEN      7641/master     
tcp6       0      0 :::25                   :::*                    LISTEN      7641/master

iptables -L -n -v --line-numbers

Chain INPUT (policy DROP 0 packets, 0 bytes)
num   pkts bytes target     prot opt in     out     source               destination         
1        0     0 ACCEPT     tcp  --  !lo    *       209.244.0.3          0.0.0.0/0            tcp dpt:53
2        0     0 ACCEPT     udp  --  !lo    *       209.244.0.3          0.0.0.0/0            udp dpt:53
3        0     0 ACCEPT     tcp  --  !lo    *       209.244.0.3          0.0.0.0/0            tcp spt:53
4        0     0 ACCEPT     udp  --  !lo    *       209.244.0.3          0.0.0.0/0            udp spt:53
5        0     0 ACCEPT     tcp  --  !lo    *       8.8.8.8              0.0.0.0/0            tcp dpt:53
6        0     0 ACCEPT     udp  --  !lo    *       8.8.8.8              0.0.0.0/0            udp dpt:53
7        0     0 ACCEPT     tcp  --  !lo    *       8.8.8.8              0.0.0.0/0            tcp spt:53
8        0     0 ACCEPT     udp  --  !lo    *       8.8.8.8              0.0.0.0/0            udp spt:53
9        0     0 ACCEPT     tcp  --  !lo    *       8.8.4.4              0.0.0.0/0            tcp dpt:53
10       0     0 ACCEPT     udp  --  !lo    *       8.8.4.4              0.0.0.0/0            udp dpt:53
11       0     0 ACCEPT     tcp  --  !lo    *       8.8.4.4              0.0.0.0/0            tcp spt:53
12      52  6331 ACCEPT     udp  --  !lo    *       8.8.4.4              0.0.0.0/0            udp spt:53
13   10491  986K LOCALINPUT  all  --  !lo    *       0.0.0.0/0            0.0.0.0/0           
14      51  3795 ACCEPT     all  --  lo     *       0.0.0.0/0            0.0.0.0/0           
15   10278  968K INVALID    tcp  --  !lo    *       0.0.0.0/0            0.0.0.0/0           
16   10226  965K ACCEPT     all  --  !lo    *       0.0.0.0/0            0.0.0.0/0            ctstate RELATED,ESTABLISHED
17       0     0 ACCEPT     tcp  --  !lo    *       0.0.0.0/0            0.0.0.0/0            ctstate NEW tcp dpt:22
18      44  2640 ACCEPT     tcp  --  !lo    *       0.0.0.0/0            0.0.0.0/0            ctstate NEW tcp dpt:27017
19       0     0 ACCEPT     tcp  --  !lo    *       0.0.0.0/0            0.0.0.0/0            ctstate NEW tcp dpt:27018
20       0     0 ACCEPT     tcp  --  !lo    *       0.0.0.0/0            0.0.0.0/0            ctstate NEW tcp dpt:27019
21       0     0 ACCEPT     icmp --  !lo    *       0.0.0.0/0            0.0.0.0/0            icmptype 8 limit: avg 1/sec burst 5
22       0     0 ACCEPT     icmp --  !lo    *       0.0.0.0/0            0.0.0.0/0            icmptype 0 limit: avg 1/sec burst 5
23       0     0 ACCEPT     icmp --  !lo    *       0.0.0.0/0            0.0.0.0/0            icmptype 11
24       0     0 ACCEPT     icmp --  !lo    *       0.0.0.0/0            0.0.0.0/0            icmptype 3
25       8   452 LOGDROPIN  all  --  !lo    *       0.0.0.0/0            0.0.0.0/0           

Chain FORWARD (policy DROP 0 packets, 0 bytes)
num   pkts bytes target     prot opt in     out     source               destination         

Chain OUTPUT (policy DROP 0 packets, 0 bytes)
num   pkts bytes target     prot opt in     out     source               destination         
1        0     0 ACCEPT     tcp  --  *      !lo     0.0.0.0/0            209.244.0.3          tcp dpt:53
2        0     0 ACCEPT     udp  --  *      !lo     0.0.0.0/0            209.244.0.3          udp dpt:53
3        0     0 ACCEPT     tcp  --  *      !lo     0.0.0.0/0            209.244.0.3          tcp spt:53
4        0     0 ACCEPT     udp  --  *      !lo     0.0.0.0/0            209.244.0.3          udp spt:53
5        0     0 ACCEPT     tcp  --  *      !lo     0.0.0.0/0            8.8.8.8              tcp dpt:53
6        0     0 ACCEPT     udp  --  *      !lo     0.0.0.0/0            8.8.8.8              udp dpt:53
7        0     0 ACCEPT     tcp  --  *      !lo     0.0.0.0/0            8.8.8.8              tcp spt:53
8        0     0 ACCEPT     udp  --  *      !lo     0.0.0.0/0            8.8.8.8              udp spt:53
9        0     0 ACCEPT     tcp  --  *      !lo     0.0.0.0/0            8.8.4.4              tcp dpt:53
10      52  3614 ACCEPT     udp  --  *      !lo     0.0.0.0/0            8.8.4.4              udp dpt:53
11       0     0 ACCEPT     tcp  --  *      !lo     0.0.0.0/0            8.8.4.4              tcp spt:53
12       0     0 ACCEPT     udp  --  *      !lo     0.0.0.0/0            8.8.4.4              udp spt:53
13    7286 1342K LOCALOUTPUT  all  --  *      !lo     0.0.0.0/0            0.0.0.0/0           
14       0     0 ACCEPT     tcp  --  *      !lo     0.0.0.0/0            0.0.0.0/0            tcp dpt:53
15       0     0 ACCEPT     udp  --  *      !lo     0.0.0.0/0            0.0.0.0/0            udp dpt:53
16       0     0 ACCEPT     tcp  --  *      !lo     0.0.0.0/0            0.0.0.0/0            tcp spt:53
17       0     0 ACCEPT     udp  --  *      !lo     0.0.0.0/0            0.0.0.0/0            udp spt:53
18      51  3795 ACCEPT     all  --  *      lo      0.0.0.0/0            0.0.0.0/0           
19    7127 1288K INVALID    tcp  --  *      !lo     0.0.0.0/0            0.0.0.0/0           
20    7127 1288K ACCEPT     all  --  *      !lo     0.0.0.0/0            0.0.0.0/0            ctstate RELATED,ESTABLISHED
21       0     0 ACCEPT     tcp  --  *      !lo     0.0.0.0/0            0.0.0.0/0            ctstate NEW tcp dpt:53
22       0     0 ACCEPT     tcp  --  *      !lo     0.0.0.0/0            0.0.0.0/0            ctstate NEW tcp dpt:80
23       0     0 ACCEPT     tcp  --  *      !lo     0.0.0.0/0            0.0.0.0/0            ctstate NEW tcp dpt:27017
24       0     0 ACCEPT     tcp  --  *      !lo     0.0.0.0/0            0.0.0.0/0            ctstate NEW tcp dpt:27018
25       0     0 ACCEPT     tcp  --  *      !lo     0.0.0.0/0            0.0.0.0/0            ctstate NEW tcp dpt:27019
26       0     0 ACCEPT     udp  --  *      !lo     0.0.0.0/0            0.0.0.0/0            ctstate NEW udp dpt:53
27       0     0 ACCEPT     udp  --  *      !lo     0.0.0.0/0            0.0.0.0/0            ctstate NEW udp dpt:123
28       0     0 ACCEPT     icmp --  *      !lo     0.0.0.0/0            0.0.0.0/0            icmptype 0
29       0     0 ACCEPT     icmp --  *      !lo     0.0.0.0/0            0.0.0.0/0            icmptype 8
30       0     0 ACCEPT     icmp --  *      !lo     0.0.0.0/0            0.0.0.0/0            icmptype 11
31       0     0 ACCEPT     icmp --  *      !lo     0.0.0.0/0            0.0.0.0/0            icmptype 3
32       0     0 LOGDROPOUT  all  --  *      !lo     0.0.0.0/0            0.0.0.0/0           

Chain ALLOWIN (1 references)
num   pkts bytes target     prot opt in     out     source               destination         
1        0     0 ACCEPT     all  --  !lo    *       162.158.0.0/15       0.0.0.0/0           
2        0     0 ACCEPT     all  --  !lo    *       198.41.128.0/17      0.0.0.0/0           
3        0     0 ACCEPT     all  --  !lo    *       197.234.240.0/22     0.0.0.0/0           
4        0     0 ACCEPT     all  --  !lo    *       188.114.96.0/20      0.0.0.0/0           
5        0     0 ACCEPT     all  --  !lo    *       190.93.240.0/20      0.0.0.0/0           
6        0     0 ACCEPT     all  --  !lo    *       108.162.192.0/18     0.0.0.0/0           
7        0     0 ACCEPT     all  --  !lo    *       141.101.64.0/18      0.0.0.0/0           
8        0     0 ACCEPT     all  --  !lo    *       103.31.4.0/22        0.0.0.0/0           
9        0     0 ACCEPT     all  --  !lo    *       103.22.200.0/22      0.0.0.0/0           
10       0     0 ACCEPT     all  --  !lo    *       103.21.244.0/22      0.0.0.0/0           
11       0     0 ACCEPT     all  --  !lo    *       173.245.48.0/20      0.0.0.0/0           
12       0     0 ACCEPT     all  --  !lo    *       199.27.128.0/21      0.0.0.0/0           
13     213 17445 ACCEPT     all  --  !lo    *       59.189.154.164       0.0.0.0/0           

Chain ALLOWOUT (1 references)
num   pkts bytes target     prot opt in     out     source               destination         
1        0     0 ACCEPT     all  --  *      !lo     0.0.0.0/0            162.158.0.0/15      
2        0     0 ACCEPT     all  --  *      !lo     0.0.0.0/0            198.41.128.0/17     
3        0     0 ACCEPT     all  --  *      !lo     0.0.0.0/0            197.234.240.0/22    
4        0     0 ACCEPT     all  --  *      !lo     0.0.0.0/0            188.114.96.0/20     
5        0     0 ACCEPT     all  --  *      !lo     0.0.0.0/0            190.93.240.0/20     
6        0     0 ACCEPT     all  --  *      !lo     0.0.0.0/0            108.162.192.0/18    
7        0     0 ACCEPT     all  --  *      !lo     0.0.0.0/0            141.101.64.0/18     
8        0     0 ACCEPT     all  --  *      !lo     0.0.0.0/0            103.31.4.0/22       
9        0     0 ACCEPT     all  --  *      !lo     0.0.0.0/0            103.22.200.0/22     
10       0     0 ACCEPT     all  --  *      !lo     0.0.0.0/0            103.21.244.0/22     
11       0     0 ACCEPT     all  --  *      !lo     0.0.0.0/0            173.245.48.0/20     
12       0     0 ACCEPT     all  --  *      !lo     0.0.0.0/0            199.27.128.0/21     
13     159 53077 ACCEPT     all  --  *      !lo     0.0.0.0/0            59.189.154.164      

Chain DENYIN (1 references)
num   pkts bytes target     prot opt in     out     source               destination         

Chain DENYOUT (1 references)
num   pkts bytes target     prot opt in     out     source               destination         

Chain INVALID (2 references)
num   pkts bytes target     prot opt in     out     source               destination         
1        0     0 INVDROP    all  --  *      *       0.0.0.0/0            0.0.0.0/0            ctstate INVALID
2        0     0 INVDROP    tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcpflags: 0x3F/0x00
3        0     0 INVDROP    tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcpflags: 0x3F/0x3F
4        0     0 INVDROP    tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcpflags: 0x03/0x03
5        0     0 INVDROP    tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcpflags: 0x06/0x06
6        0     0 INVDROP    tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcpflags: 0x05/0x05
7        0     0 INVDROP    tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcpflags: 0x11/0x01
8        0     0 INVDROP    tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcpflags: 0x18/0x08
9        0     0 INVDROP    tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcpflags: 0x30/0x20
10       0     0 INVDROP    tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcpflags:! 0x17/0x02 ctstate NEW

Chain INVDROP (10 references)
num   pkts bytes target     prot opt in     out     source               destination         
1        0     0 DROP       all  --  *      *       0.0.0.0/0            0.0.0.0/0           

Chain LOCALINPUT (1 references)
num   pkts bytes target     prot opt in     out     source               destination         
1    10491  986K ALLOWIN    all  --  !lo    *       0.0.0.0/0            0.0.0.0/0           
2    10278  968K DENYIN     all  --  !lo    *       0.0.0.0/0            0.0.0.0/0           

Chain LOCALOUTPUT (1 references)
num   pkts bytes target     prot opt in     out     source               destination         
1     7286 1342K ALLOWOUT   all  --  *      !lo     0.0.0.0/0            0.0.0.0/0           
2     7127 1288K DENYOUT    all  --  *      !lo     0.0.0.0/0            0.0.0.0/0           

Chain LOGDROPIN (1 references)
num   pkts bytes target     prot opt in     out     source               destination         
1        0     0 DROP       tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcp dpt:67
2        0     0 DROP       udp  --  *      *       0.0.0.0/0            0.0.0.0/0            udp dpt:67
3        0     0 DROP       tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcp dpt:68
4        0     0 DROP       udp  --  *      *       0.0.0.0/0            0.0.0.0/0            udp dpt:68
5        0     0 DROP       tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcp dpt:111
6        0     0 DROP       udp  --  *      *       0.0.0.0/0            0.0.0.0/0            udp dpt:111
7        0     0 DROP       tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcp dpt:113
8        0     0 DROP       udp  --  *      *       0.0.0.0/0            0.0.0.0/0            udp dpt:113
9        0     0 DROP       tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcp dpts:135:139
10       0     0 DROP       udp  --  *      *       0.0.0.0/0            0.0.0.0/0            udp dpts:135:139
11       0     0 DROP       tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcp dpt:445
12       0     0 DROP       udp  --  *      *       0.0.0.0/0            0.0.0.0/0            udp dpt:445
13       0     0 DROP       tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcp dpt:500
14       0     0 DROP       udp  --  *      *       0.0.0.0/0            0.0.0.0/0            udp dpt:500
15       0     0 DROP       tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcp dpt:513
16       0     0 DROP       udp  --  *      *       0.0.0.0/0            0.0.0.0/0            udp dpt:513
17       0     0 DROP       tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcp dpt:520
18       0     0 DROP       udp  --  *      *       0.0.0.0/0            0.0.0.0/0            udp dpt:520
19       8   452 LOG        tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            limit: avg 30/min burst 5 LOG flags 0 level 4 prefix "Firewall: *TCP_IN Blocked* "
20       0     0 LOG        udp  --  *      *       0.0.0.0/0            0.0.0.0/0            limit: avg 30/min burst 5 LOG flags 0 level 4 prefix "Firewall: *UDP_IN Blocked* "
21       0     0 LOG        icmp --  *      *       0.0.0.0/0            0.0.0.0/0            limit: avg 30/min burst 5 LOG flags 0 level 4 prefix "Firewall: *ICMP_IN Blocked* "
22       8   452 DROP       all  --  *      *       0.0.0.0/0            0.0.0.0/0           

Chain LOGDROPOUT (1 references)
num   pkts bytes target     prot opt in     out     source               destination         
1        0     0 LOG        tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcpflags: 0x17/0x02 limit: avg 30/min burst 5 LOG flags 8 level 4 prefix "Firewall: *TCP_OUT Blocked* "
2        0     0 LOG        udp  --  *      *       0.0.0.0/0            0.0.0.0/0            limit: avg 30/min burst 5 LOG flags 8 level 4 prefix "Firewall: *UDP_OUT Blocked* "
3        0     0 LOG        icmp --  *      *       0.0.0.0/0            0.0.0.0/0            limit: avg 30/min burst 5 LOG flags 8 level 4 prefix "Firewall: *ICMP_OUT Blocked* "
4        0     0 DROP       all  --  *      *       0.0.0.0/0            0.0.0.0/0
ubuntu

1 个回答

  1. Best Answer

    恭喜，在缓慢而耐心的提问的影响下，您已经解决了自己的问题。ALLOWIN 链中的规则 13 允许来自测试客户端的 IP 地址的所有流量( TCP 重置）打开（您可以到达端口，并且有人准备与您交谈）。59.189.154.164nmap

    这是一个相当复杂的规则集，许多规则的数据包计数为零，因此对您无济于事。您可能会发现，针对您的业务需求对防火墙规则进行全面检查是一项很好的时间投资，以免它们再次绊倒您。

    • 3

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