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Insert a FortiOS page

Mathieu Simon 2023-09-11 18:35:19 +02:00
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Fortinet-FortiOS.md Normal file

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FortiOS is an embedded operating system used on various appliances from Fortinet. Depending on the version of FortiOS, not all command may be available, and if major differences are known, they are combined in a specific section.
SSH into an appliance running FortiOS, or use a local serial connection in order to apply these options.
## FortiOS >= 7.4.1
```
config system global
set ssh-enc-algo chacha20-poly1305@openssh.com aes256-gcm@openssh.com
set ssh-hostkey-algo ssh-ed25519
set ssh-kex-algo diffie-hellman-group16-sha512 diffie-hellman-group18-sha512 curve25519-sha256@libssh.org
set ssh-mac-algo hmac-sha2-256-etm@openssh.com hmac-sha2-512-etm@openssh.com
end
```
**Checking the defaults**
Unless you have modified the defaults, you don't need to these, but you may still want to check them:
* ``admin-ssh-v1``: Should be disabled by default since 6.4.5
* ``string-crypto``: Should be enabled by default since 6.4.5
```
get system global | grep "ssh\|strong-crypto"
admin-ssh-grace-time: 120
admin-ssh-password : enable
admin-ssh-port : 22
admin-ssh-v1 : disable
ssh-enc-algo : chacha20-poly1305@openssh.com aes256-gcm@openssh.com
ssh-hostkey-algo : ssh-ed25519
ssh-kex-algo : diffie-hellman-group16-sha512 diffie-hellman-group18-sha512 curve25519-sha256@libssh.org
ssh-mac-algo : hmac-sha2-256-etm@openssh.com hmac-sha2-512-etm@openssh.com
strong-crypto : enable
```
## FortiOS 7.0.x / 7.2.x / 7.4.0
```
config system global
set ssh-enc-algo chacha20-poly1305@openssh.com aes256-gcm@openssh.com
set ssh-kex-algo curve25519-sha256@libssh.org
set ssh-mac-algo hmac-sha2-256-etm@openssh.com hmac-sha2-512-etm@openssh.com
end
```
**Checking the defaults**
Unless you have modified the defaults, you don't need to these, but you may still want to check them:
* ``admin-ssh-v1``: Should be disabled by default since 6.4.5
* ``string-crypto``: Should be enabled by default since 6.4.5
```
get system global | grep "ssh\|strong-crypto"
admin-ssh-grace-time: 120
admin-ssh-password : enable
admin-ssh-port : 22
admin-ssh-v1 : disable
ssh-enc-algo : chacha20-poly1305@openssh.com aes256-gcm@openssh.com
ssh-kex-algo : curve25519-sha256@libssh.org
ssh-mac-algo : hmac-sha2-256-etm@openssh.com hmac-sha2-512-etm@openssh.com
strong-crypto : enable
```
## Limitations
In most versions of FortiOS the available options don't permit reaching a perfect score, here are some of the reasons:
* Host-key algorithms: Only pretty recent FortiOS 7.4.1 and later permit changing host keys algorithms, therefore ``rsa-sha2-256`` and ``rsa-sha2-512`` cannot be disabled in older releases.