绑定 0.0.0.0 的网络服务，无法通过局域网 IP 访问，可能是什么原因导致的？
black11black · 2020-10-26 08:48:47 +08:00 · 2857 次点击这是一个创建于 1525 天前的主题，其中的信息可能已经有所发展或是发生改变。
如题，脑阔疼。
一个服务出了问题需要本地测试，
系统环境 ubuntu18.04 ，
部署方案是 nginx -> gunicorn -> flask，没过 nginx 之前是不需要域名就可以访问的。
========================
目前测试反映如下:
1 、本地访问 127.0.0.1:4433，服务正常
2 、本地执行 ifconfig，确认局域网 IP 为 192.168.0.10 （ SSH 是通过这个 IP 连上的，这里只是确认一下）
3 、执行 wget 192.168.0.10:4433 得到结果 failed:connection refused
4 、怀疑是不是防火墙拦截，直接关闭防火墙 ufw disable
5 、执行 wget 192.168.0.10:4433 得到结果 failed:connection refused，结果没有改变
6 、默认系统镜像，装机后没有单独配置过防火墙，防火墙应该本来就是关闭的
比较懵，有没有带佬知道可能是什么原因导致的
第 1 条附言 · 2020-10-26 12:40:59 +08:00
贴条，根据v友提示，查看了iptables规则和selinux，未发现影响局域网访问的选项，命令返回内容如下。
iptables查看规则列表如下
root@gui_ubuntu:~# iptables -vnL
Chain INPUT (policy ACCEPT 318 packets, 24587 bytes)
pkts bytes target prot opt in out source destination
750K 12G ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
36M 1865G ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:22
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:443
0 0 DROP tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:3306
595 39160 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0 icmptype 8
417 30218 ufw-before-logging-input all -- * * 0.0.0.0/0 0.0.0.0/0
417 30218 ufw-before-input all -- * * 0.0.0.0/0 0.0.0.0/0
416 30178 ufw-after-input all -- * * 0.0.0.0/0 0.0.0.0/0
401 28495 ufw-after-logging-input all -- * * 0.0.0.0/0 0.0.0.0/0
401 28495 ufw-reject-input all -- * * 0.0.0.0/0 0.0.0.0/0
401 28495 ufw-track-input all -- * * 0.0.0.0/0 0.0.0.0/0
第 2 条附言 · 2020-10-26 12:42:11 +08:00
接上文
```
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 ufw-before-logging-forward all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ufw-before-forward all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ufw-after-forward all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ufw-after-logging-forward all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ufw-reject-forward all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ufw-track-forward all -- * * 0.0.0.0/0 0.0.0.0/0
Chain OUTPUT (policy ACCEPT 35542 packets, 94M bytes)
pkts bytes target prot opt in out source destination
42680 96M ufw-before-logging-output all -- * * 0.0.0.0/0 0.0.0.0/0
42680 96M ufw-before-output all -- * * 0.0.0.0/0 0.0.0.0/0
35571 94M ufw-after-output all -- * * 0.0.0.0/0 0.0.0.0/0
35571 94M ufw-after-logging-output all -- * * 0.0.0.0/0 0.0.0.0/0
35571 94M ufw-reject-output all -- * * 0.0.0.0/0 0.0.0.0/0
35571 94M ufw-track-output all -- * * 0.0.0.0/0 0.0.0.0/0
Chain ufw-after-forward (1 references)
pkts bytes target prot opt in out source destination
Chain ufw-after-input (1 references)
pkts bytes target prot opt in out source destination
Chain ufw-after-logging-forward (1 references)
pkts bytes target prot opt in out source destination
以下重复若干行
```
```
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 ufw-before-logging-forward all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ufw-before-forward all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ufw-after-forward all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ufw-after-logging-forward all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ufw-reject-forward all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ufw-track-forward all -- * * 0.0.0.0/0 0.0.0.0/0
Chain OUTPUT (policy ACCEPT 35542 packets, 94M bytes)
pkts bytes target prot opt in out source destination
42680 96M ufw-before-logging-output all -- * * 0.0.0.0/0 0.0.0.0/0
42680 96M ufw-before-output all -- * * 0.0.0.0/0 0.0.0.0/0
35571 94M ufw-after-output all -- * * 0.0.0.0/0 0.0.0.0/0
35571 94M ufw-after-logging-output all -- * * 0.0.0.0/0 0.0.0.0/0
35571 94M ufw-reject-output all -- * * 0.0.0.0/0 0.0.0.0/0
35571 94M ufw-track-output all -- * * 0.0.0.0/0 0.0.0.0/0
Chain ufw-after-forward (1 references)
pkts bytes target prot opt in out source destination
Chain ufw-after-input (1 references)
pkts bytes target prot opt in out source destination
Chain ufw-after-logging-forward (1 references)
pkts bytes target prot opt in out source destination
以下重复若干行
```
第 3 条附言 · 2020-10-26 12:42:41 +08:00
cat /etc/selinux/config命令提示文件不存在，查看/etc/selinux下有唯一文件semanage.conf
内容如下：
root@gui_ubuntu:/etc/selinux# cat semanage.conf
# Authors: Jason Tang <[email protected]>
#
# Copyright (C) 2004-2005 Tresys Technology, LLC
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
# Specify how libsemanage will interact with a SELinux policy manager.
# The four options are:
#
# "source" - libsemanage manipulates a source SELinux policy
# "direct" - libsemanage will write directly to a module store.
# /foo/bar - Write by way of a policy management server, whose
# named socket is at /foo/bar. The path must begin
# with a '/'.
# foo.com:4242 - Establish a TCP connection to a remote policy
# management server at foo.com. If there is a colon
# then the remainder is interpreted as a port number;
# otherwise default to port 4242.
module-store = direct
第 4 条附言 · 2020-10-26 12:42:57 +08:00
接上文
# When generating the final linked and expanded policy, by default
# semanage will set the policy version to POLICYDB_VERSION_MAX, as
# given in <sepol/policydb.h>. Change this setting if a different
# version is necessary.
#policy-version = 19
# expand-check check neverallow rules when executing all semanage commands.
# Large penalty in time if you turn this on.
expand-check=0
# By default, semanage will generate policies for the SELinux target.
# To build policies for Xen, uncomment the following line.
#target-platform = xen
===
顺便吐槽，ubuntu18.04自带drop 3306端口的吗，这台机器应该是没装过mysql的，也是惊了。
第 5 条附言 · 2020-10-26 15:25:58 +08:00
贴条 netstat -antp
root@gui_ubuntu:~# netstat -antp
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:445 0.0.0.0:* LISTEN 25486/smbd
tcp 0 0 127.0.0.1:9000 0.0.0.0:* LISTEN 190606/php-fpm: mas
tcp 0 0 192.168.0.10:22 0.0.0.0:* LISTEN 1550/sshd
tcp 0 0 0.0.0.0:139 0.0.0.0:* LISTEN 25486/smbd
tcp 0 0 127.0.0.1:4433 0.0.0.0:* LISTEN 195998/python3.8
tcp 0 0 127.0.0.53:53 0.0.0.0:* LISTEN 1007/systemd-resolv
tcp 0 0 127.0.0.1:6010 0.0.0.0:* LISTEN 198990/sshd: wwwusr
tcp 0 0 192.168.0.10:63210 192.168.0.113:14926 ESTABLISHED 198896/sshd: wwwusr
tcp 0 0 192.168.0.10:34680 192.168.0.113:445 ESTABLISHED -
tcp 0 0 192.168.0.10:47338 192.168.0.113:3306 ESTABLISHED 196002/python3.8
tcp 0 0 192.168.0.10:47330 192.168.0.113:3306 ESTABLISHED 196001/python3.8
tcp 0 0 192.168.0.10:47332 192.168.0.113:3306 ESTABLISHED 196001/python3.8
tcp 0 0 192.168.0.10:47336 192.168.0.113:3306 ESTABLISHED 196004/python3.8
tcp 0 108 192.168.0.10:59060 65.47.201.117:7000 ESTABLISHED 199044/frpc
tcp 0 0 192.168.0.10:47334 192.168.0.113:3306 ESTABLISHED 196002/python3.8
第 6 条附言 · 2020-10-26 15:26:15 +08:00
接上
tcp 0 0 192.168.0.10:63210 192.168.0.10:38406 ESTABLISHED 199822/sshd: wwwusr
tcp 0 0 192.168.0.10:47328 192.168.0.113:3306 ESTABLISHED 196003/python3.8
tcp 0 0 192.168.0.10:47326 192.168.0.113:3306 ESTABLISHED 196003/python3.8
tcp 0 0 192.168.0.10:47340 192.168.0.113:3306 ESTABLISHED 196004/python3.8
tcp6 0 0 :::445 :::* LISTEN 25486/smbd
tcp6 0 0 :::139 :::* LISTEN 25486/smbd
tcp6 0 0 :::5678 :::* LISTEN 194568/caddy
tcp6 0 0 ::1:6010 :::* LISTEN 198990/sshd: wwwusr
root@gui_ubuntu:~#
文中公网IP经过了修改。
netstat看，端口4433的服务绑在127.0.0.1上，发现了盲点。
但是gunicorn启动命令确实是0.0.0.0，我用的gunicorn启动命令如下：
gunicorn -w 10 guiapp_gunicorn:pmain --bind 0.0.0.0:4433 --error-logfile - --worker-class sync
21 条回复 • 2020-10-26 18:25:06 +08:00
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1
Jammar 2020-10-26 08:52:20 +08:00
ip 白名单
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2
Cooky 2020-10-26 08:54:20 +08:00 via Android
iptables ？
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3
black11black OP |
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4
black11black OP 另外贴个条，各位最近有没有炸 cn2 的情况啊，坐标北方联通连搬瓦工 cn2，丢包贼严重
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5
weyou 2020-10-26 09:06:48 +08:00 via Android
关闭 selinux 试试
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6
BigOldBrother 2020-10-26 09:33:39 +08:00  1
@black11black #3 应该不是的，我搭网页的时候遇到过跟你一样的问题，ufw 关闭了防火墙，但是 iptables 里边有一条规则`6 REJECT all -- anywhere anywhere reject-with icmp-host-prohibited`会导致所有访问都被 Reject 。可以使用`iptables -L INPUT --line-numbers`找到这一行，然后运行`iptables -D INPUT {行号}`删除这一行即可。我这边系统重启之后会自动恢复，对 iptables 不太了解，而且也不经常重启就没有解决这个问题。
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7
podel 2020-10-26 09:59:41 +08:00
检查防火墙。就算是 UFW 关了 iptables 也不一定清空。
再不行 也可以抓包看看。 |
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8
Xusually 2020-10-26 10:03:47 +08:00
ufw 只是配置 iptables 的便利工具，停止它的服务并不意味着所有的 iptables 规则都被清空，还是检查一下
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9
jimmy2010 2020-10-26 10:08:55 +08:00 via Android
iptables -vnL
cat /etc/selinux/config |
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10
black11black OP @podel 了解了，那这个 ubuntu 的 ufw 搞得很神秘啊，所谓关闭防火墙实际上并没关闭，ufw disable 这个命令还有什么意义呢，┓( ´∀` )┏
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11
lithiumii 2020-10-26 10:36:47 +08:00
与其 UFW disable，不如专门 allow 你想连的端口
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12
Tink 2020-10-26 11:02:29 +08:00 1
iptables 看看
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13
Tkvoid 2020-10-26 11:10:59 +08:00 via Android
楼上已经说的挺清楚了。。。估计是 iptables 的问题
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14
black11black OP @jimmy2010 你好，请看 append，我看了一下没看出 iptables 有规则禁止，还是我看错了
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15
Keyes 2020-10-26 12:48:18 +08:00 via iPhone
/etc/hosts.deny
/etc/hosts.allow |
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16
AstroProfundis 2020-10-26 13:24:24 +08:00
0 0 DROP tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:3306
这条不就是？ |
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17
AstroProfundis 2020-10-26 13:25:38 +08:00
@AstroProfundis 看错了，楼主问的 4433 端口，那这条有点可疑
401 28495 ufw-reject-input all -- * * 0.0.0.0/0 0.0.0.0/0 |
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18
wormcy 2020-10-26 13:26:16 +08:00
netstat -antp 也发上来吧
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19
black11black OP |
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20
shenlanAZ 2020-10-26 16:03:44 +08:00
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21
black11black OP @shenlanAZ 不是，本地访问 127.0.0.1:4433 的话可以直接使用，不经过 nginx
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