starts ssh doc
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After Width: | Height: | Size: 20 KiB |
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@ -0,0 +1,75 @@
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|
# Pushing SSH a bit further
|
||||||
|
|
||||||
|
## What is SSH
|
||||||
|
|
||||||
|
### Origins
|
||||||
|
|
||||||
|
SSH is *the* current standard for remote logins but you might want to read up a bit on what was used before SSH existed.
|
||||||
|
[This](https://www.jeffgeerling.com/blog/brief-history-ssh-and-remote-access) is a pretty good blog post on the history of SSH.
|
||||||
|
You should never use the following the following programs anymore but it's good to be aware of their historic existance.
|
||||||
|
|
||||||
|
* rlogin
|
||||||
|
* rsh
|
||||||
|
* rcp
|
||||||
|
* telnet (still has some legitimate usage such as with munin)
|
||||||
|
|
||||||
|
The main advantage of SSH is it's encryption.
|
||||||
|
It works similarly to SSL which you use all the time to do most of your web browsing.
|
||||||
|
When using encryption it becomes **very** hard to sniff the data traveling between the client and the server.
|
||||||
|
There are two versions of SSH, version 1 and version 2, and you should only use version 2 as the former is not considered [secure]() anymore.
|
||||||
|
The recommended encryption used by most SSH servers is [AES](https://en.wikipedia.org/wiki/Advanced_Encryption_Standard).
|
||||||
|
If you're interested in understanding the mathematics behind AES, [this](https://www.youtube.com/channel/UC1usFRN4LCMcfIV7UjHNuQg) class is exceptionally good but not for the faint of heart.
|
||||||
|
It's not mandatory to fully understand the math behind encryption to use it though.
|
||||||
|
The main takeaway would be the number of **bit's used** where **higher** is **better**.
|
||||||
|
By default ssh uses a very secure cipher but you can specify which one you want with the `-c` flag to `ssh`.
|
||||||
|
Do keep in mind that the server needs to support the cipher you're requesting.
|
||||||
|
|
||||||
|
## SSH keys
|
||||||
|
|
||||||
|
SSH encryption and SSH keys are not the same thing.
|
||||||
|
**Keys** are used for **authentication** with a server.
|
||||||
|
Once the client is authenticated and granted access to the server, the encryption is set to **encrypt** the **traffic** from client to server and visa versa.
|
||||||
|
SSH keys are [asymmetric](https://en.wikipedia.org/wiki/Public-key_cryptography) key pairs where you have two simple text files.
|
||||||
|
One with the **private** part, which is used for **decrypting**, and one **public** part which is used for **encrypting**.
|
||||||
|
Both parts together form one **key pair**.
|
||||||
|
If you're interested in the maths behind key pairs, have a look at this 15min [video](https://www.youtube.com/watch?v=4zahvcJ9glg&t=1s), it's a lot easier than you expect!
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
### Generating keys
|
||||||
|
|
||||||
|
### Deploying keys
|
||||||
|
|
||||||
|
## Standard usage
|
||||||
|
|
||||||
|
## Tweaking the sshd configuration file
|
||||||
|
|
||||||
|
All server configuration is done in the `/etc/ssh/sshd_config` file.
|
||||||
|
Starting version TO_CHECK you can use the modern `/etc/ssh/sshd_config.d/` folder system to override default system configuration.
|
||||||
|
This way any changes to the standard configuration made by the package maintainers won't mess with your custom preferences and tweaks.
|
||||||
|
|
||||||
|
### Version
|
||||||
|
|
||||||
|
A modern sshd configuration will only allow version 2 but you can check or specify this in the configuration file.
|
||||||
|
You'll probably never have to set this yourself but do keep it in mind when you're confronted with old installations.
|
||||||
|
|
||||||
|
```
|
||||||
|
Protocol
|
||||||
|
Specifies the protocol versions sshd(8) supports. The possible values are ‘1’ and
|
||||||
|
‘2’. Multiple versions must be comma-separated. The default is ‘2’. Protocol 1
|
||||||
|
suffers from a number of cryptographic weaknesses and should not be used. It is
|
||||||
|
only offered to support legacy devices.
|
||||||
|
|
||||||
|
Note that the order of the protocol list does not indicate preference, because the
|
||||||
|
client selects among multiple protocol versions offered by the server. Specifying
|
||||||
|
“2,1” is identical to “1,2”.
|
||||||
|
```
|
||||||
|
|
||||||
|
## Tunnels
|
||||||
|
|
||||||
|
## SFTP
|
||||||
|
|
||||||
|
## SSHFS
|
||||||
|
|
||||||
|
## SSHuttle
|
||||||
|
|
||||||
Loading…
Reference in New Issue