Claude
03027f9769
Ruled by Captain Bob, 2026-11-07: "New root CA on the CI box. Valid StarshipOS rather than snake oil intermediate." - ci/pki/make-ca.sh makes the StarshipOS Root CA (its key stays on the CI box) and the StarshipOS Capsule Signing intermediate it issues, and stores the signing key as the secret CAPSULE_SIGN_KEY. - The kernel finds the signing certificate by one name, CAPSULE_SIGNING_CERT_NAME = pki:starshipos-intermediate.der. The certificate itself lands once make-ca.sh has run; until then the snakeoil intermediate is in the tree under its old name and the capsules check as "no root key" (a warning, as "missing" was). - mkcapsule refuses a signing key that is not that certificate's. - SIGN_KEY has no default; acceptance, build, nightly and release set it from the secret. FABRIC-3.md XLVI. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GE3SDvQn5EoxdGufk84zz2
82 lines
4.0 KiB
Bash
Executable File
82 lines
4.0 KiB
Bash
Executable File
#!/bin/bash
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# make-ca.sh -- the StarshipOS capsule-signing PKI, made once, on the CI box (Captain Bob,
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# 2026-11-07: "New root CA on the CI box. Valid StarshipOS rather than snake oil intermediate").
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#
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# StarshipOS Root CA Ed25519, 20 years, self-signed. Its key never leaves this box:
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# not in the repository, not in Gitea, not in any image.
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# StarshipOS Capsule Signing Ed25519, 10 years, signed by the root; CA:TRUE, pathlen:0.
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# Its certificate is built into every image (capsules/pki/
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# starshipos-intermediate.der) and checks each capsule at boot;
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# its key signs the capsules (mkcapsule --sign-key), in CI from
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# the repository secret CAPSULE_SIGN_KEY.
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#
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# Replaces the offline LithosAnanke Root CA and its snakeoil intermediate (FABRIC-2.md,
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# Milestone 6) for every build. Run as root:
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#
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# sudo ci/pki/make-ca.sh [dir] # dir defaults to /var/lib/starshipos-ca
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#
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# It refuses to overwrite an existing CA. When it is done it prints the two certificates (public:
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# paste them where they are wanted) and says how to put the signing key into Gitea. With
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# GITEA_TOKEN set (a token that may administer the repository), it stores the secret itself.
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set -euo pipefail
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umask 077
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dir=${1:-/var/lib/starshipos-ca}
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repo=${GITEA_REPO:-rajames/LithosAnanke}
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api=${GITEA_API:-https://gitea.starshipos-f18.org/api/v1}
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command -v openssl >/dev/null || { echo "make-ca: needs openssl" >&2; exit 1; }
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[ -e "$dir/root/root.key" ] && { echo "make-ca: $dir already holds a CA; not overwriting it" >&2; exit 1; }
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mkdir -p "$dir/root" "$dir/signing"
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cd "$dir"
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cat > ca.cnf <<'CNF'
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[ req ]
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distinguished_name = dn
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prompt = no
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[ dn ]
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[ root_ext ]
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basicConstraints = critical, CA:TRUE
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keyUsage = critical, keyCertSign, cRLSign
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subjectKeyIdentifier = hash
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[ signing_ext ]
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basicConstraints = critical, CA:TRUE, pathlen:0
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keyUsage = critical, keyCertSign, cRLSign, digitalSignature
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subjectKeyIdentifier = hash
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authorityKeyIdentifier = keyid:always
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CNF
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# the root
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openssl genpkey -algorithm ed25519 -out root/root.key
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openssl req -new -x509 -key root/root.key -days 7305 -config ca.cnf -extensions root_ext \
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-subj "/O=StarshipOS/CN=StarshipOS Root CA" -out root/root.pem
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# the capsule-signing intermediate, signed by the root
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openssl genpkey -algorithm ed25519 -out signing/signing.key
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openssl req -new -key signing/signing.key -config ca.cnf \
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-subj "/O=StarshipOS/CN=StarshipOS Capsule Signing" -out signing/signing.csr
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openssl x509 -req -in signing/signing.csr -CA root/root.pem -CAkey root/root.key \
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-CAcreateserial -days 3652 -extfile ca.cnf -extensions signing_ext -out signing/signing.pem
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openssl x509 -in signing/signing.pem -outform DER -out signing/starshipos-intermediate.der
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openssl verify -CAfile root/root.pem signing/signing.pem
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chmod 700 root signing; chmod 600 root/* signing/*
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if [ -n "${GITEA_TOKEN:-}" ]; then
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python3 -c 'import json,sys; print(json.dumps({"data": open(sys.argv[1]).read()}))' signing/signing.key |
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curl -fsS -o /dev/null -X PUT -H "Authorization: token $GITEA_TOKEN" -H 'Content-Type: application/json' \
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"$api/repos/$repo/actions/secrets/CAPSULE_SIGN_KEY" -d @- &&
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echo "make-ca: stored the signing key as $repo's secret CAPSULE_SIGN_KEY"
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else
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echo "make-ca: put $dir/signing/signing.key, whole, into $repo's Actions secret CAPSULE_SIGN_KEY"
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echo " (Settings -> Actions -> Secrets), or run again with GITEA_TOKEN set -- after"
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echo " removing $dir, since it refuses to overwrite a CA."
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fi
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echo
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echo "=== The root certificate (public) -- $dir/root/root.pem"
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cat root/root.pem
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echo "=== The capsule-signing certificate (public) -- $dir/signing/signing.pem"
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cat signing/signing.pem
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echo "=== Fingerprints"
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openssl x509 -in root/root.pem -noout -fingerprint -sha256 -subject -enddate
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openssl x509 -in signing/signing.pem -noout -fingerprint -sha256 -subject -issuer -enddate
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