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docs: add new section: Setting up a SSH Key 

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
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Bo-Yi Wu 2022-07-30 10:23:52 +08:00
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@ -66,6 +66,111 @@ SSH Proxy Setting:
* proxy_fingerprint - fingerprint SHA256 of the host public key, default is to skip verification
* proxy_use_insecure_cipher - include more ciphers with use_insecure_cipher (see [#15](https://github.com/appleboy/scp-action/issues/15))
### Setting up a SSH Key
Make sure to follow the below steps while creating SSH Keys and using them.
The best practice is create the SSH Keys on local machine not remote machine.
Login with username specified in Github Secrets. Generate a RSA Key-Pair:
<details>
<summary>rsa</summary>
<p>
```bash
ssh-keygen -t rsa -b 4096 -C "your_email@example.com"
```
</p>
</details>
<details>
<summary>ed25519</summary>
<p>
```bash
ssh-keygen -t ed25519 -a 200 -C "your_email@example.com"
```
</p>
</details>
Add newly generated key into Authorized keys. Read more about authorized keys [here](https://www.ssh.com/ssh/authorized_keys/).
<details>
<summary>rsa</summary>
<p>
```bash
cat .ssh/id_rsa.pub | ssh b@B 'cat >> .ssh/authorized_keys'
```
</p>
</details>
<details>
<summary>ed25519</summary>
<p>
```bash
cat .ssh/id_ed25519.pub | ssh b@B 'cat >> .ssh/authorized_keys'
```
</p>
</details>
Copy Private Key content and paste in Github Secrets.
<details>
<summary>rsa</summary>
<p>
```bash
clip < ~/.ssh/id_rsa
```
</p>
</details>
<details>
<summary>ed25519</summary>
<p>
```bash
clip < ~/.ssh/id_ed25519
```
</p>
</details>
See the detail information about [SSH login without password](http://www.linuxproblem.org/art_9.html).
**A note** from one of our readers: Depending on your version of SSH you might also have to do the following changes:
* Put the public key in `.ssh/authorized_keys2`
* Change the permissions of `.ssh` to 700
* Change the permissions of `.ssh/authorized_keys2` to 640
### If you are using OpenSSH
If you are currently using OpenSSH and are getting the following error:
```bash
ssh: handshake failed: ssh: unable to authenticate, attempted methods [none publickey]
```
Make sure that your key algorithm of choice is supported. On Ubuntu 20.04 or later you must explicitly allow the use of the ssh-rsa algorithm. Add the following line to your OpenSSH daemon file (which is either `/etc/ssh/sshd_config` or a drop-in file under
`/etc/ssh/sshd_config.d/`):
```bash
CASignatureAlgorithms +ssh-rsa
```
Alternatively, `ed25519` keys are accepted by default in OpenSSH. You could use this instead of rsa if needed:
```bash
ssh-keygen -t ed25519 -a 200 -C "your_email@example.com"
```
### Example
Copy file via a SSH password: