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:
[[email protected] ~]# cat /etc/redhat-release CentOS Linux release 7.2.1511 (Core)
2、安装开发环境,提供编译环境:
[[email protected] ~]# yum groupinstall "Development Tools" "Server Plateform Development" -y
3、安装zlib依赖包文件,不然后续编译会报错:
[[email protected] ~]# yum -y install zlib-devel
编译安装及配置:
1、下载dropbear:
[[email protected] src]# wget http://matt.ucc.asn.au/dropbear/dropbear-2016.74.tar.bz2 --2016-11-08 16:56:44-- 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... 200 OK 长度:1622234 (1.5M) [application/x-bzip2] 正在保存至: “dropbear-2016.74.tar.bz2” 100%[======================================>] 1,622,234 539KB/s 用时 2.9s 2016-11-08 16:56:50 (539 KB/s) - 已保存 “dropbear-2016.74.tar.bz2” [1622234/1622234])
2、解压dropbear-2016.74.tar.bz2
[[email protected] src]# tar xf dropbear-2016.74.tar.bz2
3、编译/安装dropbear:
1)运行configure脚本:
[[email protected] dropbear-2016.74]# ./configure prefix=/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: Now edit options.h to choose features.
2)运行make命令,完成项目构件:
[[email protected] dropbear-2016.74]# make PROGRAMS="dropbear dbclient dropbearkey dropbearconvert scp"
3)运行make install命令,完成安装:
[[email protected] dropbear-2016.74]# make PROGRAMS="dropbear dbclient dropbearkey dropbearconvert scp" 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:#./dbclient [email protected] Scp可以向远程的服务器写文件和取文件; 用法:#./scp /home/bin/a.log [email protected]:/home/working
4、配置系统环境变量:
[[email protected] ~]# vim /etc/profile.d/dropbear.sh [[email protected] ~]# cat /etc/profile.d/dropbear.sh export PATH=/usr/local/dropbear/bin:/usr/local/dropbear/sbin/:$PATH [[email protected] ~]# . /etc/profile.d/dropbear.sh
5、配置dropbear服务器端:
# dropbear -h -r keyfile Specify hostkeys (repeatable) defaults: dss /etc/dropbear/dropbear_dss_host_key rsa /etc/dropbear/dropbear_rsa_host_key ecdsa /etc/dropbear/dropbear_ecdsa_host_key -R Create hostkeys as required -F Don‘t fork into background -E Log to stderr rather than syslog
(1)sshd服务器都需要公钥,生成公钥:
# mkdir /etc/dropbear # cd /etc/dropbear # dropbearkey -t dss -f dropbear_dss_host_key //生成dss密钥文件 # dropbearkey -t rsa -s 2048 -f dropbear_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:
[[email protected] ~]# dropbear -p 2022
方法2:在编译dropbear之前,修改options.sh文件中:
define DROPBEAR_DEFPORT "22" 改为 define DROPBEAR_DEFPORT "2022" 或执行:# sed -i ‘s/22/2022/g‘ options.h
启动dropbear:
[[email protected] ~]# dropbear -p 2022
查看端口是否监听成功:
[[email protected] ~]# ss -tnlp | grep :2022 LISTEN 0 128 *:2022 *:* users:(("dropbear",pid=27687,fd=4)) LISTEN 0 128 :::2022 :::* users:(("dropbear",pid=27687,fd=5))
6、设置firwalld开放2022端口:
[[email protected] ~]# firewall-cmd --add-port=2022/tcp --permanent success [[email protected] ~]# firewall-cmd --reload success [[email protected] ~]# firewall-cmd --list-all public (default, active) interfaces: enp0s3 enp0s8 sources: services: dhcpv6-client http ssh ports: 53/tcp 53/udp 2022/tcp masquerade: no forward-ports: icmp-blocks: rich rules:
7、使用ssh client端测试:
# ssh -p 2022 [email protected]
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: dropbear ssh daemon # chkconfig: 2345 66 33 # 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 "Starting generate the dss key: " $dropbearkey -t dss -f $dsskey &> /dev/null RETVAL=$? if [ $RETVAL -eq 0 ]; then success echo return 0 else failure echo return 1 fi } genrsakey() { [ -d /etc/dropbear ] || mkdir /etc/dropbear echo -n "Starting generate the rsa key: " $dropbearkey -t rsa -s $keysize -f $rsakey &> /dev/null RETVAL=$? if [ $RETVAL -eq 0 ]; then success echo return 0 else failure echo return 1 fi } start() { [ -e $dsskey ] || gendsskey [ -e $rsakey ] || genrsakey if [ -e $lockfile ]; then echo -n "dropbear daemon is already running: " success echo exit 0 fi echo -n "Starting dropbear: " daemon --pidfile="$pidfile" $dropbear -p $port -d $dsskey -r $rsakey RETVAL=$? echo if [ $RETVAL -eq 0 ]; then touch $lockfile return 0 else rm -f $lockfile $pidfile return 1 fi } stop() { if [ ! -e $lockfile ]; then echo -n "dropbear service is stopped: " success echo exit 1 fi echo -n "Stopping dropbear daemon: " killproc dropbear RETVAL=$? echo if [ $RETVAL -eq 0 ]; then rm -f $lockfile $pidfile return 0 else return 1 fi } status() { if [ -e $lockfile ]; then echo "dropbear is running..." else echo "dropbear is stopped..." fi } usage() { echo "Usage: dropbear {start|stop|restart|status|gendsskey|genrsakey}" } case $1 in start) start ;; stop) stop ;; restart) stop start ;; status) status ;; gendsskey) gendsskey ;; genrsakey) genrsakey ;; *) usage ;; esac
ps:编译时报错:
configure: error: *** zlib missing - install first or check config.log ***
猜测因为安装的版本过新,需升级zlib:
http://www.aixchina.net/Article/39407
安装编译完最新的zlib之后,发现还是不行,搜索之,又发现一篇好文,解决了:
http://blog.csdn.net/shunzi19860518/article/details/479682