(Linux)(Ubuntu) SSH server

發表於 2018-02-16 | 分類於 Linux ， Ubuntu

安裝SSH Server

apt-get install openssh-server

或者

apt-get install ssh

設定SSH Server
- SSH設定檔(ssh_config)
```
sudo gedit /etc/ssh/sshd_config
```
- 開啟SSH Port(更改ssh_config)
```
PORT 22
```
- 禁止root帳戶登入(更改ssh_config)
```
PermitRootLogin no
```
- 限定特定使用者群組ssh登入(更改ssh_config)
```
AllowGroups ssh
```
檢查SSH服務是否啟動
```
ps ax | grep ssh
```
Client端使用ssh連線至SSH server
```
ssh user@server_ip
```
Client端使用SSH Key連線至SSH Server
- Client建立SSH Key (key1.pub與key1)
  
  ssh-keygen
- Client上傳SSH Key公鑰(key1.pub)
  - Client操作上傳
```
ssh-copy-id -i key1.pub user@server_ip
```
  - Server端操作,先藉由其他方法將公鑰複製至Server
```
cat /path/to/key1.pub >> /home/user1/.ssh/authorized_keys
```
    注:不同使用者則為
```
cat /path/to/key1.pub >> /home/user2/.ssh/authorized_keys
```
    注:單個使用者可有多組SSH Key
```
cat /path/to/key2.pub >> /home/user1/.ssh/authorized_keys
```
  - Server端,調整authorized_keys檔案權限
```
chmod 600 /home/user1/.ssh/authorized_keys
```