42 lines
2.3 KiB
Markdown
42 lines
2.3 KiB
Markdown
## LAYLO Code - Secure, resilient, privacy-friendly code hosting
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This document gives an overview to the applied security standards that are in use on `code.laylo.cloud`.
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### Goals
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This Gitea instance is configured following best practices, in order to thwart low to medium level attacks. The threat model does not include protection against high-level adversaries (eg, nation states).
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### Global
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- The OS and software is updated every week (Thursdays, 22:00 - 23:59 CEST).
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- The storage on the server is fully encrypted, both in OpenStack and the VM itself (the latter one using `AES-XTS-256`, see `misc/softraid.pdf` for the specification).
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- The server _solely_ runs the Gitea stack (with Nginx and PostgreSQL), thus preventing additional attack surface.
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### Web front-end
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- Any plain-text (HTTP) traffic is redirected to the TLS secure counterpart (HTTPS).
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- TLS (or more specifically: TLSv1.2 and TLSv1.3) is used for transit encryption - with HSTS and the following ciphers:
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```
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ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-CHACHA20-POLY1305:AES-256-GCM-SHA384:EECDH+AESGCM:EDH+AESGCM
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- OCSP stapling is enabled.
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- TLS session tickets are disabled (at least until Nginx fixes this properly).
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### Networking
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- The server itself is strictly firewalled (using `pf(8)`), both egress and ingress - on a daemon/service level.
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- Internal service communication is encrypted (eg: Gitea is configured to connect to the local PostgreSQL server using TLS).
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### Etc
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- Official commits (eg, in the `laylo/docs` repository) are GPG signed, and MFA is enforced for accounts with write access.
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- Backups are made every 24 hours, using a 'pull mechanism'. This server does **NOT** have access to the backup repository.
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- SSH is hardened (PKI authentication, MFA via hardware tokens).
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- SSH ciphers are hardened, these are in use:
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```
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Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes256-ctr
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KexAlgorithms sntrup761x25519-sha512@openssh.com,curve25519-sha256@libssh.org,diffie-hellman-group18-sha512,diffie-hellman-group16-sha512
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MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,umac-128-etm@openssh.com
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HostKeyAlgorithms ssh-ed25519,ssh-ed25519-cert-v01@openssh.com,rsa-sha2-256,rsa-sha2-512,rsa-sha2-256-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com
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- The GPG public keys can be found in `signing-keys/`
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