64 lines
2.3 KiB
Markdown
Executable File
64 lines
2.3 KiB
Markdown
Executable File
# fschl dotfiles
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some stuff that makes my linux life more portable and comfortable.
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for debian, or debian-based distros. using i3wm.org on the desktop.
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also uses containers.
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strongly inspired by awesome work by https://github.com/jessfraz
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## Notes
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### Security
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#### Hardening ssh
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- https://blog.g3rt.nl/upgrade-your-ssh-keys.html
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- https://stribika.github.io/2015/01/04/secure-secure-shell.html
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- https://wiki.mozilla.org/Security/Guidelines/OpenSSH#OpenSSH_client
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add this to `~/.ssh/config`:
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```
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# Ensure KnownHosts are unreadable if leaked - it is otherwise easier to know which hosts your keys have access to.
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HashKnownHosts yes
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# Host keys the client accepts - order here is honored by OpenSSH
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HostKeyAlgorithms ssh-ed25519-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ssh-ed25519,ssh-rsa,ecdsa-sha2-nistp521-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp521,ecdsa-sha2-nistp384,ecdsa-sha2-nistp256
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KexAlgorithms curve25519-sha256@libssh.org,ecdh-sha2-nistp521,ecdh-sha2-nistp384,ecdh-sha2-nistp256,diffie-hellman-group-exchange-sha256
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MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-512,hmac-sha2-256,umac-128@openssh.com
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Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr
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```
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*generating keys*
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```bash
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# RSA keys are favored over ECDSA keys when backward compatibility ''is required'',
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# thus, newly generated keys are always either ED25519 or RSA (NOT ECDSA or DSA).
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$ ssh-keygen -t rsa -b 4096 -f ~/.ssh/id_rsa_host_$(date +%Y-%m-%d) -C "Key to HOST for user-xyz"
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# ED25519 keys are favored over RSA keys when backward compatibility ''is not required''.
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# This is only compatible with OpenSSH 6.5+ and fixed-size (256 bytes).
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$ ssh-keygen -t ed25519 -f ~/.ssh/id_ed25519_host_$(date +%Y-%m-%d) -C "Key to HOST for user-xyz"
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```
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#### GnuPG
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- https://wiki.mozilla.org/Security/Key_Management
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`~/.gnupg/gpg.conf`:
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```
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# from https://wiki.mozilla.org/Security/Key_Management
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personal-digest-preferences SHA512 SHA384
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cert-digest-algo SHA256
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default-preference-list SHA512 SHA384 AES256 ZLIB BZIP2 ZIP Uncompressed
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keyid-format 0xlong
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```
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## TODO
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- explain setup, ideas, practises
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- add HOWTO
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- seperate sources.list setup for server/desktop
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