2023-11-20 02:35:36 +01:00
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# Runelab CA
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A certificate authority for the HomeLab.
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The setup was mostly done by following these two guides:
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* [Jamie Nguyen's OpenSSL CA guide](https://jamielinux.com/docs/openssl-certificate-authority/introduction.html)
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* [Mour's](https://github.com/mylamour) [blog post Jamie's guide using an HSM](https://github.com/mylamour/blog/issues/80)
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## Notes of precaution
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* The root key is a yubikey kept in a physical vault at a bank in Switzerland.
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* All signings are done on an airgapped machine in a live-boot environment.
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* This repo is transferred on and off the signing machine with a regular usb drive.
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## Setup
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### Required Software
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* OpenSSL
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2024-02-12 21:01:22 +01:00
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* libp11
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2023-11-20 02:35:36 +01:00
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* [YKCS11](https://developers.yubico.com/yubico-piv-tool/YKCS11/)
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2024-02-12 21:01:22 +01:00
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*[AUR Link](https://aur.archlinux.org/packages/ykcs11-p11-kit-module)
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**macOS note:** openssl installed via homebrew does not pickup on libp11, you need to manually copy the pkcs11 library (update the versions):
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`cp /opt/homebrew/Cellar/libp11/0.4.12/lib/engines-3/pkcs11.dylib /opt/homebrew/Cellar/openssl@3/3.2.1/lib/engines-3/`
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### Environment Variables
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These must be set for all openssl operations.
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Linux:
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- `PKCS11_MODULE_PATH="/usr/lib/libykcs11.so"`
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macOS:
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- `PKCS11_MODULE_PATH="/opt/homebrew/lib/libykcs11.dylib"`
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2023-11-20 02:35:36 +01:00
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### Generating the Root
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```sh
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# Creating directory structure
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mkdir {certs,crl,csr,newcerts,conf}
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# Creating required files
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touch database.txt
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echo 1000 > serial
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echo 1000 > crlnumber
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# OpenSSL CA config file
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vim config/ca.conf
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# Generating the root
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openssl req -new -x509 -days 8000 -sha256 -extensions v3_ca -engine pkcs11 -keyform engine -key "pkcs11:object=Private key for PIV Authentication" -out certs/root.ca.cert.pem
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```
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### Issuing Intermediaries
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```sh
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# Sign the Intermediary
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openssl ca -config config/ca.conf -engine pkcs11 -keyform engine -keyfile "pkcs11:object=Private key for PIV Authentication" -extensions v3_intermediate_ca -days 1095 -notext -md sha256 -in csr/foobar.int.csr -out certs/foobar.int.cert.pem
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# Add the CA to create a chain
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echo certs/root.ca.cert.pem >> certs/foobar.int.cert.pem
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```
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### Certificate Revocation List
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Distribution point configured in under `server_cert` > `crlDistributionPoints`
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This must be reissued every 180 days
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```sh
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# Revoke the certificate
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openssl ca -config config/ca.conf -revoke certs/foobar.int.cert.pem
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# Create the CRL file
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openssl ca -config config/ca.conf -gencrl -out crl/ca.crl.pem -engine pkcs11 -keyform engine -keyfile "pkcs11:object=Private key for PIV Authentication"
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```
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