authorized_keys should be 600

[djzort]

https://github.com/mmatuska/mfsbsd/blob/24798f3482172806fe1307bb509722cfe202dc93/Makefile#L404

Should force 600 when installing.

[Matatu]

This is probably not an issue, the "authorized_keys" file contain only public keys and there is no recommendation make it user readable (like a private key).