ci(signing): enforce key consistency across docs, repo, and generated assets

scripts/ci/verify_signing_key_consistency.sh

@@ -0,0 +1,73 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
+cd "$REPO_ROOT"
+
+SKILL_MD="skills/clawsec-suite/SKILL.md"
+CANONICAL_KEYS=(
+  "clawsec-signing-public.pem"
+  "advisories/feed-signing-public.pem"
+  "skills/clawsec-suite/advisories/feed-signing-public.pem"
+)
+
+fingerprint_for_pem() {
+  local pem_file="$1"
+  openssl pkey -pubin -in "$pem_file" -outform DER | shasum -a 256 | awk '{print $1}'
+}
+
+if [[ ! -f "$SKILL_MD" ]]; then
+  echo "ERROR: missing $SKILL_MD" >&2
+  exit 1
+fi
+
+DOC_EXPECTED_FPR="$(awk -F'"' '/RELEASE_PUBKEY_SHA256=/{print $2; exit}' "$SKILL_MD")"
+if [[ -z "$DOC_EXPECTED_FPR" ]]; then
+  echo "ERROR: could not parse RELEASE_PUBKEY_SHA256 from $SKILL_MD" >&2
+  exit 1
+fi
+
+TMP_DOC_KEY="$(mktemp)"
+trap 'rm -f "$TMP_DOC_KEY"' EXIT
+awk '
+  /-----BEGIN PUBLIC KEY-----/ {in_key=1}
+  in_key {print}
+  /-----END PUBLIC KEY-----/ {exit}
+' "$SKILL_MD" > "$TMP_DOC_KEY"
+
+if ! grep -q "BEGIN PUBLIC KEY" "$TMP_DOC_KEY"; then
+  echo "ERROR: could not extract inline public key from $SKILL_MD" >&2
+  exit 1
+fi
+
+DOC_INLINE_FPR="$(fingerprint_for_pem "$TMP_DOC_KEY")"
+
+if [[ "$DOC_INLINE_FPR" != "$DOC_EXPECTED_FPR" ]]; then
+  echo "ERROR: SKILL.md mismatch: inline key fingerprint ($DOC_INLINE_FPR) != RELEASE_PUBKEY_SHA256 ($DOC_EXPECTED_FPR)" >&2
+  exit 1
+fi
+
+echo "SKILL.md inline key fingerprint matches RELEASE_PUBKEY_SHA256: $DOC_EXPECTED_FPR"
+
+CANONICAL_FPR=""
+for key_file in "${CANONICAL_KEYS[@]}"; do
+  if [[ ! -f "$key_file" ]]; then
+    echo "ERROR: missing canonical key file: $key_file" >&2
+    exit 1
+  fi
+  fpr="$(fingerprint_for_pem "$key_file")"
+  echo "$key_file -> $fpr"
+  if [[ -z "$CANONICAL_FPR" ]]; then
+    CANONICAL_FPR="$fpr"
+  elif [[ "$fpr" != "$CANONICAL_FPR" ]]; then
+    echo "ERROR: key fingerprint mismatch among canonical pem files" >&2
+    exit 1
+  fi
+done
+
+if [[ "$CANONICAL_FPR" != "$DOC_EXPECTED_FPR" ]]; then
+  echo "ERROR: canonical pem fingerprint ($CANONICAL_FPR) != SKILL.md RELEASE_PUBKEY_SHA256 ($DOC_EXPECTED_FPR)" >&2
+  exit 1
+fi
+
+echo "All signing key references are consistent: $CANONICAL_FPR"