SSH login without password
When I connect other pc via ssh command, I always type password. That’s very annoying. :(
Is it possible connect without type password? And, the answer is YES.
tl;dr
- copy my pc’s public key to remote pc.
- append public key to
authorized_keysfile on remote pc. - connect it.
Generate ssh key.
[enji@localhost ~]$ ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/home/enji/.ssh/id_rsa):
Created directory '/home/enji/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/enji/.ssh/id_rsa.
Your public key has been saved in /home/enji/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:nCnkdmVbuXjHY0NyP+bROE1J/NVP3HMUdMR7tDDOLU8 enji@localhost
The key's randomart image is:
+---[RSA 3072]----+
| oOB|
| +.o%|
| . o * *+X|
| o . = + X E=|
| + S o o %+=|
| . o . oo=o|
| . |
| |
| |
+----[SHA256]-----+
[enji@localhost ~]$
Copy to remote pc
[enji@localhost ~]$ scp $HOME/.ssh/id_rsa.pub enji@192.168.0.4:id_rsa.pub
enji@192.168.0.4's password:
id_rsa.pub 100% 408 46.9KB/s 00:00
Append to authorized_keys
[enji@localhost ~]$ ssh enji@192.168.0.4
enji@192.168.0.4's password:
Linux home_server 4.9.0-9-amd64 #1 SMP Debian 4.9.168-1+deb9u3 (2019-06-16) x86_64
The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
No mail.
Last login: Thu Jun 27 21:42:31 2019 from 192.168.0.1
enji@home_server:~$ cat id_rsa.pub >> $HOME/.ssh/authorized_keys
enji@home_server:~$ exit
Connect
[enji@localhost ~]$ ssh enji@192.168.0.4
Linux home_server 4.9.0-9-amd64 #1 SMP Debian 4.9.168-1+deb9u3 (2019-06-16) x86_64
The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
No mail.
Last login: Tue Jul 2 02:57:51 2019 from 192.168.0.45
enji@home_server:~$ exit
Actually, this tip is for me. :P