配置ssh密钥对认证及scp、ftp等文件传输_密钥ftp

目录

ssh密钥配对认证

文件传输

---

 

linux主机之间 

 telnet 192.168.1.120 ssh          #测试对方的ssh 服务是否开启 
 #按Ctrl + ] 会呼出telnet的命令行

ssh密钥配对认证

• openssh 连接 

[root@localhost ~]# ping ton.tom -c2     //没ping通主机名在/etc/hosts下添加 或者直接ping对方ip
PING ton.tom (192.168.1.111) 56(84) bytes of data.
64 bytes from ton.tom (192.168.1.111): icmp_seq=1 ttl=64 time=1.03 ms
64 bytes from ton.tom (192.168.1.111): icmp_seq=2 ttl=64 time=0.883 ms
 
--- ton.tom ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 3ms
rtt min/avg/max/mdev = 0.883/0.954/1.025/0.071 ms
[root@localhost ~]# 
[root@localhost .ssh]# ssh ton.tom
The authenticity of host 'ton.tom (192.168.1.111)' can't be established.
RSA key fingerprint is SHA256:7oVlQO5rj8RWD0uXREAYX1Z/YSgSpKg0YMUywjTnHrA.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'ton.tom' (RSA) to the list of known hosts.
root@ton.tom's password: 
Last login: Sun Jul 26 04:23:39 2020 from 192.168.1.120
[root@ton ~]# 
[root@ton ~]# ls
anaconda-ks.cfg  file_creat.c        linux-2.6.28.10.tar.gz                          
[root@ton ~]# exit
logout
Connection to ton.tom closed.
[root@localhost ~]#

• 添加key认证，免密码登陆 

[server@localhost ~]$ ssh-keygen   #生成密钥对
 
Generating public/private rsa key pair.
Enter file in which to save the key (/home/server/.ssh/id_rsa): 
Created directory '/home/server/.ssh'.
Enter passphrase (empty for no passphrase): #直接回车不添加
Enter same passphrase again: 
Your identification has been saved in /home/server/.ssh/id_rsa.
Your public key has been saved in /home/server/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:CwLPbgDUDAliuAiFe69bEWJN2raeyw5Qc1GaUr+Ocj0 server@localhost
The key's randomart image is:
+---[RSA 2048]----+
|=** +..          |
|B. O =           |
|+oO O .          |
|++.X o .         |
|....* o S        |
| . +.B . .       |
|  o.O E .        |
|  .B . .         |
|  .o+            |
+----[SHA256]-----+
[server@localhost ~]$ ssh-copy-id yonghu@192.168.1.111    #把公钥文件上传到对应用户
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/home/server/.ssh/id_rsa.pub"
The authenticity of host '192.168.1.111 (192.168.1.111)' can't be established.
RSA key fingerprint is SHA256:7oVlQO5rj8RWD0uXREAYX1Z/YSgSpKg0YMUywjTnHrA.
Are you sure you want to continue connecting (yes/no)? yes
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
yonghu@192.168.1.111's password: 
Number of key(s) added: 1
Now try logging into the machine, with:   "ssh 'yonghu@192.168.1.111'"
and check to make sure that only the key(s) you wanted were added.
[server@localhost ~]$ ssh yonghu@192.168.1.111   #这时就可以不用输入密码直接登入了
[yonghu@ton ~]$ ls

• 涉及到的命令 

ssh-keygen -t rsa        #生成密钥对   
ssh-keygen -t dsa        # -t  type     #密钥类型
 
ssh-copy-id -i ~/.ssh/id_rsa.pub root@ton.tom   #-i identity_file  将本机的公钥复制到远程用户地址上

 

 /etc/ssh/sshd_config需对应配置文件

Port 22
Protocol 2
 
PermitRootLogin yes               #允许root可以ssh登陆
PubkeyAuthentication yes          #设置密钥对的访问方式
PasswordAuthentication yes
AuthorizedKeysFile  .ssh/authorized_keys

tips: 

使用 ssh 加命令 的方式比较安全

同时为了连接方便可以使用alias

alias ton="ssh root@ton.tom "       （hostname后面加多一个空格以免后面命令连接上来，同时可将alias写入~/.bashrc中）

执行时直接 

ton "mkdir /tmp/test"

[root@localhost ~]# ssh root@192.168.1.111  "ls /home"   
root@192.168.1.111's password: 
bincopy.sh
initrd.img
iso
pub
tom
vmlinuz
yonghu
[root@localhost ~]# 

•  SecureCRT公钥连接主机（即crt与主机间的免密认证登陆）

 
 tools -> create public key -> 选择加密算法 
 rsa    并且加密长度设置最长
 
 保存成id_rsa
 生成全局id_rsa.pub   

选择生成OpenSSH  密钥格式

 拷贝其中公钥id_rsa.pub的内容到服务器上的.ssh文件夹下的authorized_keys文件中
 

authorized_keys 可直接手动创建

#手动创建需如下
-rw-------  1 tom tom  381 Jul 26 07:28 authorized_keys      ----注意属组与权限600
drwx------  2 tom  tom  4096 Jul 26 07:28 .ssh               ----目录属组与权限700

文件传输

• 使用scp命令直接上传文件到ssh用户端

[server@localhost ~]$ scp tom.txt yonghu@192.168.1.111:/home/yonghu        #上传

[server@localhost ~]$ scp yonghu@192.168.1.111:/tmp/3.txt ./           #下载到本地当前目录下

-p       保留文件的时间和权限     preserve

-r       递归        recursive

-C      压缩传输时的数据流

• 同步rsync

rsync -av root@192.168.1.111:/var/log /server/     将服务器上的整个目录同步到当前   ./server目录下

 

scp拷贝比较生硬，没有分析文件不同，rsync则不同

rsync会比scp更好传输文件他会发送文件的时间，大小，和md5来判断文件是否需要重传

• sftp 

[server@localhost ~]$ sftp yonghu@192.168.1.111
Connected to yonghu@192.168.1.111.
sftp> put tom.txt   #上传
Uploading tom.txt to /home/yonghu/tom.txt
tom.txt                                 100%    0     0.0KB/s   00:00    
sftp> get /tmp/3.txt #从服务器端下载
Fetching /tmp/3.txt to 3.txt
sftp> exit

如果遇到ftp connection refused，可以 service vsftpd restart

ftp遇到的错误 

ftp: root@192.168.3.139: Temporary failure in name resolution
 
#网关配置问题
 
ftp: root@192.168.3.139: Name or service not known
 
sudo iptables -F    #可关闭iptables

 

 

• lftp - Sophisticated file transfer program

mget *.iso       下载多个文件
lcd  切换本地下载目录 
get [OPTS] <rfile> [-o <lfile>]      

[root@localhost ~]# lftp -u root,123456  192.168.1.11        / user:passwd
lftp root@192.168.1.111:~> pwd                       打印出一个ftp链接
ftp://root:123456@192.168.1.111/%2Froot

可使用root去ftp
vsftpd/ user_list
vsftpd/ ftpusers

•  nfs

NFS /etc/export配置
/var/ftp/pub   192.168.1.0/255.255.255.0(ro,async)  

 

Centos8 重启网络service 命令

restart NetworkManager.service

Ubuntu16.04 重启网络service 命令 

service networking restart