Dropbear是一个相对较小的SSH服务器和客户端。是另一款ssh协议的开源实现;
主要功能:
类似于OpenSSH,实现完整的SSH客户端和服务器版本2协议。但它不支持SSH版本1,以节省空间和资源,并避免在SSH版本1的固有的安全漏洞。支持scp。
安装环境:
1、CentOS 7.2:
[root@CentOS7~]#cat/etc/redhat-release CentOSLinuxrelease7.2.1511(Core)
2、安装开发环境,提供编译环境:
[root@CentOS7~]#yumgroupinstall"DevelopmentTools""ServerPlateformDevelopment"-y
3、安装zlib依赖包文件,不然后续编译会报错:
[root@CentOS7~]#yum-yinstallzlib-devel
编译安装及配置:
1、下载dropbear:
[root@CentOS7src]#wgethttp://matt.ucc.asn.au/dropbear/dropbear-2016.74.tar.bz2 --2016-11-0816:56:44--http://matt.ucc.asn.au/dropbear/dropbear-2016.74.tar.bz2 正在解析主机matt.ucc.asn.au(matt.ucc.asn.au)...130.95.13.18,2405:3c00:5200:100::18 正在连接matt.ucc.asn.au(matt.ucc.asn.au)|130.95.13.18|:80...已连接。 已发出HTTP请求,正在等待回应...200OK 长度:1622234(1.5M)[application/x-bzip2] 正在保存至:“dropbear-2016.74.tar.bz2” 100%[======================================>]1,622,234539KB/s用时2.9s 2016-11-0816:56:50(539KB/s)-已保存“dropbear-2016.74.tar.bz2”[1622234/1622234])
2、解压dropbear-2016.74.tar.bz2
[root@CentOS7src]#tarxfdropbear-2016.74.tar.bz2
3、编译/安装dropbear:
1)运行configure脚本:
[root@CentOS7dropbear-2016.74]#./configureprefix=/usr/local/dropbear--sysconfdir=/etc/dropbear--disable-pam 显示如下信息表示./configure运行成功,提示编辑options.sh文件选择功能,在此文件中可以设置监听的端口号: configure:Noweditoptions.htochoosefeatures.
2)运行make命令,完成项目构件:
[root@CentOS7dropbear-2016.74]#makePROGRAMS="dropbeardbclientdropbearkeydropbearconvertscp"
3)运行make install命令,完成安装:
[root@CentOS7dropbear-2016.74]#makePROGRAMS="dropbeardbclientdropbearkeydropbearconvertscp"install Dropbearkey是用来生成公钥的; Dropbearconvert是用来与openssh转换的; Dbclient可以用来连接远程的服务器; 用法:#./dbclientusername@192.168.99.214 Scp可以向远程的服务器写文件和取文件; 用法:#./scp/home/bin/a.logusername@192.168.99.214:/home/working
4、配置系统环境变量:
[root@CentOS7~]#vim/etc/profile.d/dropbear.sh [root@CentOS7~]#cat/etc/profile.d/dropbear.sh exportPATH=/usr/local/dropbear/bin:/usr/local/dropbear/sbin/:$PATH [root@CentOS7~]#./etc/profile.d/dropbear.sh
5、配置dropbear服务器端:
#dropbear-h -rkeyfileSpecifyhostkeys(repeatable) defaults: dss/etc/dropbear/dropbear_dss_host_key rsa/etc/dropbear/dropbear_rsa_host_key ecdsa/etc/dropbear/dropbear_ecdsa_host_key -RCreatehostkeysasrequired -FDon'tforkintobackground -ELogtostderrratherthansyslog
(1)sshd服务器都需要公钥,生成公钥:
#mkdir/etc/dropbear #cd/etc/dropbear #dropbearkey-tdss-fdropbear_dss_host_key//生成dss密钥文件 #dropbearkey-trsa-s2048-fdropbear_rsa_host_key//生成rsa密钥文件
(2)启动dropbear:
启动dropbear命令进程时注意监听的端口号:
方法1:使用-p选项指定监听的端口:
[root@CentOS7~]#dropbear-p2022
方法2:在编译dropbear之前,修改options.sh文件中:
defineDROPBEAR_DEFPORT"22"改为defineDROPBEAR_DEFPORT"2022" 或执行:#sed-i's/22/2022/g'options.h
启动dropbear:
[root@CentOS7~]#dropbear-p2022
查看端口是否监听成功:
[root@CentOS7~]#ss-tnlp|grep:2022 LISTEN0128*:2022*:*users:(("dropbear",pid=27687,fd=4)) LISTEN0128:::2022:::*users:(("dropbear",fd=5))
6、设置firwalld开放2022端口:
[root@CentOS7~]#firewall-cmd--add-port=2022/tcp--permanent success [root@CentOS7~]#firewall-cmd--reload success [root@CentOS7~]#firewall-cmd--list-all public(default,active) interfaces:enp0s3enp0s8 sources: services:dhcpv6-clienthttpssh ports:53/tcp53/udp2022/tcp masquerade:no forward-ports: icmp-blocks: richrules:
7、使用ssh client端测试:
#ssh-p2022root@172.16.100.11
8、设置为服务:
以下脚本内容来自:http://blog.chinaunix.net/xmlrpc.php?r=blog/article&uid=29584738&id=4234090
#vim/etc/rc.d/init.d/dropbear #!/bin/bash # #description:dropbeaRSShdaemon #chkconfig:23456633 # dsskey=/etc/dropbear/dropbear_dss_host_key rsakey=/etc/dropbear/dropbear_rsa_host_key lockfile=/var/lock/subsys/dropbear pidfile=/var/run/dropbear.pid dropbear=/usr/local/sbin/dropbear dropbearkey=/usr/local/bin/dropbearkey [-r/etc/rc.d/init.d/functions]&&./etc/rc.d/init.d/functions [-r/etc/sysconfig/dropbear]&&./etc/sysconfig/dropbear keysize=${keysize:-1024} port=${port:-22} gendsskey(){ [-d/etc/dropbear]||mkdir/etc/dropbear echo-n"Startinggeneratethedsskey:" $dropbearkey-tdss-f$dsskey&>/dev/null RETVAL=$? if[$RETVAL-eq0];then success echo return0 else failure echo return1 fi } genrsakey(){ [-d/etc/dropbear]||mkdir/etc/dropbear echo-n"Startinggeneratethersakey:" $dropbearkey-trsa-s$keysize-f$rsakey&>/dev/null RETVAL=$? if[$RETVAL-eq0];then success echo return0 else failure echo return1 fi } start(){ [-e$dsskey]||gendsskey [-e$rsakey]||genrsakey if[-e$lockfile];then echo-n"dropbeardaemonisalreadyrunning:" success echo exit0 fi echo-n"Startingdropbear:" daemon--pidfile="$pidfile"$dropbear-p$port-d$dsskey-r$rsakey RETVAL=$? echo if[$RETVAL-eq0];then touch$lockfile return0 else rm-f$lockfile$pidfile return1 fi } stop(){ if[!-e$lockfile];then echo-n"dropbearserviceisstopped:" success echo exit1 fi echo-n"Stoppingdropbeardaemon:" killprocdropbear RETVAL=$? echo if[$RETVAL-eq0];then rm-f$lockfile$pidfile return0 else return1 fi } status(){ if[-e$lockfile];then echo"dropbearisrunning..." else echo"dropbearisstopped..." fi } usage(){ echo"Usage:dropbear{start|stop|restart|status|gendsskey|genrsakey}" } case$1in start) start;; stop) stop;; restart) stop start ;; status) status ;; gendsskey) gendsskey ;; genrsakey) genrsakey ;; *) usage ;; esac
ps:编译时报错:
configure:error:***zlibmissing-installfirstorcheckconfig.log***
猜测因为安装的版本过新,需升级zlib:
http://www.aixchina.net/Article/39407