47 lines
1.9 KiB
Bash
47 lines
1.9 KiB
Bash
#!/usr/bin/env bash
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set -uo pipefail
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# CASAN Plan-16 SEC-23 (23.9, MT-04) — sign + verify the tenant/project registry.
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#
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# An UNSIGNED registry lets an attacker register a fake tenant or swap another
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# tenant's project mapping (bypassing every tenant boundary that trusts it). This
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# signs the registry (detached signature) and verifies it on load. A tampered,
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# forged (wrong key), or unsigned registry is REFUSED — fail-closed by default.
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#
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# Usage:
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# tenant-registry-verify.sh sign <registry-file> <priv-key>
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# tenant-registry-verify.sh verify <registry-file> <pub-key>
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# Exit: 0 ok · 2 invalid/tampered/forged · 3 missing signature/file/openssl · 64 usage.
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# (Production anchors the signature in KMS — see SEC-02; this is the offline form.)
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CMD="${1:-}"; REG="${2:-}"; KEY="${3:-}"
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command -v openssl >/dev/null 2>&1 || { echo "REGISTRY_OPENSSL_UNAVAILABLE" >&2; exit 3; }
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case "$CMD" in
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sign)
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[[ -f "$REG" && -f "$KEY" ]] || { echo "usage: tenant-registry-verify.sh sign <registry> <priv-key>" >&2; exit 64; }
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if openssl dgst -sha256 -sign "$KEY" -out "$REG.sig" "$REG" 2>/dev/null; then
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echo "REGISTRY_SIGNED file=$REG sig=$REG.sig"
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exit 0
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fi
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echo "REGISTRY_SIGN_FAILED file=$REG" >&2; exit 2
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;;
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verify)
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[[ -f "$REG" ]] || { echo "REGISTRY_MISSING file=$REG" >&2; exit 3; }
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[[ -f "$KEY" ]] || { echo "REGISTRY_PUBKEY_MISSING key=$KEY" >&2; exit 3; }
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if [[ ! -f "$REG.sig" ]]; then
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# SEC-23/SEC-01: unsigned registry is REFUSED (fail-closed), not trusted.
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echo "REGISTRY_UNSIGNED file=$REG — refusing (fail-closed)" >&2; exit 3
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fi
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if openssl dgst -sha256 -verify "$KEY" -signature "$REG.sig" "$REG" >/dev/null 2>&1; then
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echo "REGISTRY_VERIFIED file=$REG"
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exit 0
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fi
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echo "REGISTRY_INVALID file=$REG — tampered or forged signature" >&2; exit 2
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;;
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*)
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echo "Usage: tenant-registry-verify.sh {sign|verify} <registry-file> <key>" >&2
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exit 64
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;;
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esac
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