Add helper script to generate Sigstore trust configuration

generate-trust-config.sh

@@ -0,0 +1,111 @@
+#!/bin/bash
+
+# Usage: ./generate-trust-config.sh <trusted_root_input.json> <output.json> [caUrl] [oidcUrl] [tlogUrl] [tsaUrl]
+#
+# Creates a Sigstore client trust configuration by wrapping a trusted root
+# with signing configuration. URLs can be provided via CLI args or environment variables.
+#
+# Environment variables (used as fallbacks):
+#   CA_URL    - Certificate Authority URL (default: fulcio)
+#   OIDC_URL  - OIDC provider URL (default: oauth)
+#   TLOG_URL  - Rekor transparency log URL (default: rekor)
+#   TSA_URL   - Timestamp Authority base URL (default: https://timestamp.example.com)
+#
+# Getting URLs from Trusted Artifact Signer (OpenShift):
+#   export CA_URL=$(oc get fulcio -o jsonpath='{.items[0].status.url}' -n trusted-artifact-signer)
+#   export TLOG_URL=$(oc get rekor -o jsonpath='{.items[0].status.url}' -n trusted-artifact-signer)
+#   export TSA_URL=$(oc get timestampauthorities -o jsonpath='{.items[0].status.url}' -n trusted-artifact-signer)
+#   export OIDC_URL="<your-oidc-issuer-url>"
+
+set -euo pipefail
+
+show_usage() {
+    echo "Usage: $0 <trusted_root_input.json> <output.json> [caUrl] [oidcUrl] [tlogUrl] [tsaUrl]"
+    echo ""
+    echo "Arguments:"
+    echo "  trusted_root_input.json  - Input trusted root JSON file"
+    echo "  output.json              - Output client trust config file"
+    echo "  caUrl                    - Certificate Authority URL (optional)"
+    echo "  oidcUrl                  - OIDC provider URL (optional)"
+    echo "  tlogUrl                  - Transparency log URL (optional)"
+    echo "  tsaUrl                   - Timestamp Authority base URL (optional, /api/v1/timestamp appended)"
+    echo ""
+    echo "URLs can also be set via environment variables: CA_URL, OIDC_URL, TLOG_URL, TSA_URL"
+}
+
+if [ "$#" -lt 2 ] || [ "$#" -gt 6 ]; then
+    show_usage
+    if [ "$#" -gt 6 ]; then
+        echo ""
+        echo "Error: Too many arguments."
+    fi
+    exit 1
+fi
+
+if ! command -v jq &> /dev/null; then
+    echo "Error: 'jq' is required but not installed."
+    exit 1
+fi
+
+INPUT_FILE="$1"
+OUTPUT_FILE="$2"
+CA_URL="${3:-${CA_URL:-fulcio}}"
+OIDC_URL="${4:-${OIDC_URL:-oauth}}"
+TLOG_URL="${5:-${TLOG_URL:-rekor}}"
+TSA_URL_BASE="${6:-${TSA_URL:-https://timestamp.example.com}}"
+TSA_URL="${TSA_URL_BASE%/}/api/v1/timestamp"
+
+if [ ! -f "$INPUT_FILE" ]; then
+    echo "Error: Input file '$INPUT_FILE' not found."
+    exit 1
+fi
+
+# Transform checkpointKeyId to logId in the trusted root
+# If 'checkpointKeyId' exists, rename it to 'logId'; otherwise leave as-is (1.3 trust root issue)
+transform_checkpoint() {
+    jq 'walk(if type == "object" and has("checkpointKeyId") then
+        .logId = .checkpointKeyId | del(.checkpointKeyId)
+    else . end)'
+}
+
+jq -n \
+  --argjson trustedRoot "$(transform_checkpoint < "$INPUT_FILE")" \
+  --arg caUrl "$CA_URL" \
+  --arg oidcUrl "$OIDC_URL" \
+  --arg tlogUrl "$TLOG_URL" \
+  --arg tsaUrl "$TSA_URL" \
+  '{
+    mediaType: "application/vnd.dev.sigstore.clienttrustconfig.v0.1+json",
+    trustedRoot: $trustedRoot,
+    signingConfig: {
+      mediaType: "application/vnd.dev.sigstore.signingconfig.v0.2+json",
+      caUrls: [{
+        url: $caUrl,
+        majorApiVersion: 1,
+        validFor: { start: "2023-04-14T21:38:40Z" },
+        operator: "example.com"
+      }],
+      oidcUrls: [{
+        url: $oidcUrl,
+        majorApiVersion: 1,
+        validFor: { start: "2025-04-16T00:00:00Z" },
+        operator: "example.com"
+      }],
+      rekorTlogUrls: [{
+        url: $tlogUrl,
+        majorApiVersion: 1,
+        validFor: { start: "2021-01-12T11:53:27Z" },
+        operator: "example.com"
+      }],
+      tsaUrls: [{
+        url: $tsaUrl,
+        majorApiVersion: 1,
+        validFor: { start: "2025-04-09T00:00:00Z" },
+        operator: "example.com"
+      }],
+      rekorTlogConfig: { selector: "ANY" },
+      tsaConfig: { selector: "ANY" }
+    }
+  }' > "$OUTPUT_FILE"
+
+echo "Configuration written to $OUTPUT_FILE"