引言
有時(shí)候服務(wù)器，為了安全需要，會(huì)限制某些ip和端口對(duì)服務(wù)器的訪問。那具體該如何配置呢？本文帶你解決。
禁用IP和端口
1、方法1：iptables
iptables v1.8.4
Usage: iptables -[ACD] chain rule-specification [options]
iptables -I chain [rulenum] rule-specification [options]
iptables -R chain rulenum rule-specification [options]
iptables -D chain rulenum [options]
iptables -[LS] [chain [rulenum]] [options]
iptables -[FZ] [chain] [options]
iptables -[NX] chain
iptables -E old-chain-name new-chain-name
iptables -P chain target [options]
iptables -h (print this help information)
Commands:
Either long or short options are allowed.
--append -A chain Append to chain
--check -C chain Check for the existence of a rule
--delete -D chain Delete matching rule from chain
--delete -D chain rulenum
Delete rule rulenum (1 = first) from chain
--insert -I chain [rulenum]
Insert in chain as rulenum (default 1=first)
--replace -R chain rulenum
Replace rule rulenum (1 = first) in chain
--list -L [chain [rulenum]]
List the rules in a chain or all chains
--list-rules -S [chain [rulenum]]
Print the rules in a chain or all chains
--flush -F [chain] Delete all rules in chain or all chains
--zero -Z [chain [rulenum]]
Zero counters in chain or all chains
--new -N chain Create a new user-defined chain
--delete-chain
-X [chain] Delete a user-defined chain
--policy -P chain target
Change policy on chain to target
--rename-chain
-E old-chain new-chain
Change chain name, (moving any references)
Options:
--ipv4 -4 Nothing (line is ignored by ip6tables-restore)
--ipv6 -6 Error (line is ignored by iptables-restore)
[!] --protocol -p proto protocol: by number or name, eg. `tcp'
[!] --source -s address[/mask][...]
source specification
[!] --destination -d address[/mask][...]
destination specification
[!] --in-interface -i input name[+]
network interface name ([+] for wildcard)
--jump -j target
target for rule (may load target extension)
--goto -g chain
jump to chain with no return
--match -m match
extended match (may load extension)
--numeric -n numeric output of addresses and ports
[!] --out-interface -o output name[+]
network interface name ([+] for wildcard)
--table -t table table to manipulate (default: `filter')
--verbose -v verbose mode
--wait -w [seconds] maximum wait to acquire xtables lock before give up
--wait-interval -W [usecs] wait time to try to acquire xtables lock
default is 1 second
--line-numbers print line numbers when listing
--exact -x expand numbers (display exact values)
[!] --fragment -f match second or further fragments only
--modprobe=<command> try to insert modules using this command
--set-counters PKTS BYTES set the counter during insert/append
[!] --version -V print package version.
- ??端口
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 5053 -j DROP
- ??IP
iptables -I INPUT -s 10.115.10.129 -j DROP
- 保存配置
sudo service iptables save
實(shí)測(cè)這條命令行不通，報(bào)錯(cuò)：iptables: unrecognized service
下面這條可以
sudo iptables-save
2、方法2：ufw
UFW (Uncomplicated Firewall)是Ubuntu 自帶的防火墻配置工具 。UFW 是一個(gè)用來管理 iptables 防火墻規(guī)則的用戶友好的前端工具。它的主要目的就是為了使得管理 iptables 更簡(jiǎn)單。
Usage: ufw COMMAND
Commands:
enable enables the firewall
disable disables the firewall
default ARG set default policy
logging LEVEL set logging to LEVEL
allow ARGS add allow rule
deny ARGS add deny rule
reject ARGS add reject rule
limit ARGS add limit rule
delete RULE|NUM delete RULE
insert NUM RULE insert RULE at NUM
route RULE add route RULE
route delete RULE|NUM delete route RULE
route insert NUM RULE insert route RULE at NUM
reload reload firewall
reset reset firewall
status show firewall status
status numbered show firewall status as numbered list of RULES
status verbose show verbose firewall status
show ARG show firewall report
version display version information
Application profile commands:
app list list application profiles
app info PROFILE show information on PROFILE
app update PROFILE update PROFILE
app default ARG set default application policy
Ubuntu安裝完畢，默認(rèn)沒有啟動(dòng)ufw。所以如果直接運(yùn)行上述語句，那么它啟動(dòng)后就會(huì)使用默認(rèn)規(guī)則，禁止一切流量，包括SSH的22端口，如果本來就是在SSH上遠(yuǎn)程操作，那么悲劇了，所以要先啟用SSH的端口（默認(rèn)是22，如果你設(shè)置了其他端口就加上去）
sudo ufw allow 22
sudo ufw reject 80 #(拒絕，直接返回：Connection refused）
sudo ufw deny 5053 #(否認(rèn)，過段時(shí)間后返回：Connection timed out）
sudo ufw enable
sudo ufw status
- 查看ufw防火墻是否在工作，查看使用中的規(guī)則
ufw status
- 啟動(dòng)/關(guān)閉/重置ufw防火墻
ufw enable
ufw disable
ufw reset
- 允許其它主機(jī)訪問本機(jī)21端口，協(xié)議包含tcp和udp
ufw allow 21
-允許其它主機(jī)使用tcp協(xié)議訪問本機(jī)80端口
ufw allow 80/tcp
- 可以使用in或out來指定向內(nèi)還是向外。如果未指定，默認(rèn)是in
允許訪問本機(jī)http端口
ufw allow in http
- 禁止其它主機(jī)訪問本機(jī)80端口，
-
reject，直接告訴拒絕，返回的提示信息更多，比如ssh該主機(jī)時(shí)，直接返回：Connection refused
-
deny，否認(rèn)，返回的提示信息少，比如ssh該主機(jī)時(shí)，過段時(shí)間后才返回：Connection timed out
-
ufw reject 80
ufw deny 80
- 禁止本機(jī)對(duì)外訪問192.168.1.1
（實(shí)測(cè)有用）
ufw deny out to 192.168.1.1
- 禁止192.168.1.1對(duì)內(nèi)訪問本機(jī)
（實(shí)測(cè)沒用）
ufw deny from 192.168.1.1
- 刪除規(guī)則，只要在命令中加入delete就行了
ufw delete deny 80/tcp
- 打開/關(guān)閉log
ufw logging on
ufw logging off
logging on后 默認(rèn)是low 等級(jí)。ufw支持多個(gè)等級(jí)： ‘low’, ‘medium’, ‘high’ and ‘full’。簡(jiǎn)單說low記錄事件做少，其他等級(jí)記錄逐級(jí)增加。使用默認(rèn)的low level就夠了。log文件保存在/var/log/ufw.log 文件內(nèi)，可以用tail -n COUNT file的形式顯示最后幾行文章來源：http://www.zghlxwxcb.cn/news/detail-595688.html
參考文檔
Linux下iptables屏蔽IP和端口號(hào)
Ubuntu 18.04 防火墻設(shè)置ufw詳解
如何在 Ubuntu 20.04 上使用 UFW 來設(shè)置防火墻
Ubuntu自帶防火墻ufw配置和用法文章來源地址http://www.zghlxwxcb.cn/news/detail-595688.html
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