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64 lines
1.7 KiB
Markdown
64 lines
1.7 KiB
Markdown
# SSH
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SSH is a network protocoll to securely connect to a computer.
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In this article it is assumed that `openssh` is used.
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## Usage
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### Generate New Keys
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To generate new ssh keys simply run `ssh-keygen -t ed25519` or
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`ssh-keygen -t rsa -b 4096`.
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The keys can then be added to the authentication agent by as described in the
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[corresponding article](#adding-keys-to-authentication-agent)
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### Adding Keys to Authentication Agent
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The following line will add a key to the authentication agent.
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```ssh
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ssh-add id_rsa
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```
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Depending on the name of the certificate inside the `~/.ssh` folder the name
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`id_rsa` can vary.
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For example `id_ed25519` is the name if the first generation option was chosen.
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### Enable Root Login via SSH
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Edit the `/etc/ssh/sshd_config` and change the line containing `PermitRootLogin`
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to `PermitRootLogin yes`.
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### Add Login via SSH Public Key
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To enable easy login without password you can add the contents of the file
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`~/.ssh/id_rsa.pub` from your local machine to the file `~/.ssh/authorized_keys`
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on the machine you want to log into.
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You can use the modified command below for ease of use:
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```sh
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cat ~/.ssh/id_rsa.pub | ssh username@server 'cat >> ~/.ssh/authorized_keys'
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```
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### Mount Directory With SSHFS
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To mount a directory (in this case called `directory`) from a remote server
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(in this case called `server` also can be substituted by something like
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`user@server-ip`) on a local mount (in this case `mountpoint`) run:
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```sh
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sshfs server:/directory mountpoint
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```
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### Shorten SSH Connection Commands
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By adding the following lines to the file `~/.ssh/config` the command of an SSH
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connection can be shortened from `ssh user@server.tld` to `ssh server`.
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```txt
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Host server
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HostName server.tld
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User user
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```
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