Ubuntu (18.04.3) SSH edition Key authentication

1. Update ``` $ ssh -p port number account name@IP address ```

In the previous article, you can already enter from the Mac terminal.

$ sudo apt update

Every time. I will never forget this.

2. Creating a key (server side) As a key storage destination Create a key with /home/username/.ssh.

$ ssh-keygen -t rsa -f arbitrary name

Specify password.

Enter passphrase (empty for no passphrase): 
Enter same passphrase again:

Check below

$ ls

Any name: private key Any name.pub: Public key

3. Various settings (miscellaneous) ``` vi arbitrary name ``` This will copy the contents.

The rest is Mac /Users/username/.ssh/private key Copy the contents to and save.

Then do the following:

$cat arbitrary name.pub >> authorized_keys

Change permissions.

$ chmod 600 authorized_keys
$ chmod 700 /home/account name/.ssh

Delete original public key

rm -f arbitrary name.pub

Delete private key

$rm any name

/etc/ssh/sshd_config Add (or uncomment) the following to.

+ChallengeResponseAuthentication no
+PubkeyAuthentication yes

sshd restart

$ sudo /etc/init.d/ssh restart

Create /Users/accountname/.ssh/config for Mac

Host account name
HostName IP address
User account name
        IdentityFile /Users/account name/.ssh/account name
Port Port number

with this,

$ssh account name

Put in

Password authentication is still possible at this point, so add (or uncomment) the following

+PasswordAuthentication no

Well then

$ssh account name
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@         WARNING: UNPROTECTED PRIVATE KEY FILE!          @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
・ ・ ・ ・ ・ ・ ・ ・ ・

Oops ... It looks like you have to change the permissions on your Mac.

$ chmod 0600 ~/.ssh/

Then, once again.

Enter passphrase for key ‘・ ・ ・ ・ ・ ・

Now enter with the password you entered when creating the key.

By the way, it seems that the password for the ssh key cannot be saved with config.

Ubuntu (18.04.3) SSH edition Key authentication

1. Update ``` $ ssh -p port number account name@IP address ``` In the previous article, you can already enter from the Mac terminal. $ sudo apt update Every time. I will never forget this.

2. Creating a key (server side) As a key storage destination Create a key with /home/username/.ssh. $ ssh-keygen -t rsa -f arbitrary name Specify password. Enter passphrase (empty for no passphrase): Enter same passphrase again: Check below $ ls Any name: private key Any name.pub: Public key

1. Update ``` $ ssh -p port number account name@IP address ```
In the previous article, you can already enter from the Mac terminal.

`$ sudo apt update`

Every time. I will never forget this.