fix: reject control characters in manifest URLs

packages/contract/src/ascii.ts

@@ -0,0 +1,9 @@
+export function containsAsciiControl(value: string): boolean {
+  for (const character of value) {
+    const codePoint = character.codePointAt(0);
+    if (codePoint !== undefined && (codePoint <= 0x1f || codePoint === 0x7f)) {
+      return true;
+    }
+  }
+  return false;
+}

packages/contract/src/parse.ts

@@ -14,6 +14,7 @@ import {
   type ToolboxRequirements,
   type ToolboxSource,
 } from "./types.js";
+import { containsAsciiControl } from "./ascii.js";
 
 type UnknownRecord = Record<string, unknown>;
 
@@ -108,6 +109,10 @@ function referenceAt(
 ): string | undefined {
   const value = stringAt(object, key, path, issues, { optional });
   if (value === undefined) return undefined;
+  if (containsAsciiControl(value)) {
+    issues.push(`${path}.${key} must not contain ASCII control characters`);
+    return undefined;
+  }
   if (value.includes("\\")) {
     issues.push(`${path}.${key} must use URL path separators`);
     return undefined;

packages/contract/src/urls.ts

@@ -6,6 +6,7 @@ import {
   type ResolvedToolboxPrivacy,
   type ToolboxAppManifest,
 } from "./types.js";
+import { containsAsciiControl } from "./ascii.js";
 
 const WEB_PROTOCOLS = new Set(["http:", "https:"]);
 
@@ -13,6 +14,15 @@ export function resolveWebUrl(
   reference: string | URL,
   base?: string | URL,
 ): URL {
+  if (
+    (typeof reference === "string" && containsAsciiControl(reference)) ||
+    (typeof base === "string" && containsAsciiControl(base))
+  ) {
+    throw new ToolboxError(
+      "invalid-url",
+      "URL strings must not contain ASCII control characters",
+    );
+  }
   let url: URL;
   try {
     url = base === undefined ? new URL(reference) : new URL(reference, base);

packages/contract/test/contract.test.ts

@@ -5,6 +5,7 @@ import {
   loadToolboxContext,
   parseToolboxApp,
   parseToolboxCatalog,
+  resolveWebUrl,
   type ToolboxAppManifest,
 } from "../src/index.js";
 import { describe, expect, it, vi } from "vitest";
@@ -179,6 +180,21 @@ describe("same-origin discovery", () => {
 });
 
 describe("loading and links", () => {
+  it.each([
+    ["TAB", "\t"],
+    ["LF", "\n"],
+    ["CR", "\r"],
+    ["C0", "\u0001"],
+    ["DEL", "\u007f"],
+  ])("rejects %s in URL helper string inputs", (_name, control) => {
+    expect(() =>
+      resolveWebUrl(`./before${control}after`, "https://tools.example.test/"),
+    ).toThrow(/control characters/u);
+    expect(() =>
+      resolveWebUrl("./tool", `https://tools.example.test/${control}`),
+    ).toThrow(/control characters/u);
+  });
+
   it("loads a catalog, resolves manifests and URLs, and supports external apps", async () => {
     const fetch = vi.fn(
       async (input: string | URL | Request, init?: RequestInit) => {

packages/contract/test/schema-parity.test.ts

@@ -95,6 +95,17 @@ const validCatalog = (): Record<string, unknown> => ({
   apps: [{ manifest: "./apps/example/toolbox-app.json", enabled: true }],
 });
 
+const asciiUrlControls = [
+  ...Array.from({ length: 0x20 }, (_, codePoint) => codePoint),
+  0x7f,
+].map(
+  (codePoint) =>
+    [
+      `U+${codePoint.toString(16).toUpperCase().padStart(4, "0")}`,
+      String.fromCodePoint(codePoint),
+    ] as const,
+);
+
 describe("canonical schema and runtime parser parity", () => {
   const acceptedApps: Array<[string, () => Record<string, unknown>]> = [
     ["the baseline app", validApp],
@@ -170,6 +181,48 @@ describe("canonical schema and runtime parser parity", () => {
     expectParity(validateApp, parseToolboxApp, fixture(), false);
   });
 
+  it.each(asciiUrlControls)(
+    "rejects %s embedded in an app URL reference",
+    (_label, control) => {
+      expectParity(
+        validateApp,
+        parseToolboxApp,
+        { ...validApp(), entry: `./before${control}after` },
+        false,
+      );
+    },
+  );
+
+  it.each([
+    ["TAB", "icon", "\t"],
+    ["LF", "privacy URL", "\n"],
+    ["CR", "repository URL", "\r"],
+    ["DEL", "action URL", "\u007f"],
+  ] as const)("rejects %s in an app %s", (_name, field, control) => {
+    const fixture = validApp();
+    if (field === "icon") fixture.icon = `./icon${control}.svg`;
+    if (field === "privacy URL") {
+      fixture.privacy = {
+        processing: "local",
+        fileUploads: false,
+        telemetry: false,
+        url: `./privacy${control}.html`,
+      };
+    }
+    if (field === "repository URL") {
+      fixture.source = {
+        repository: `https://example.test/source${control}code`,
+        license: "MIT",
+      };
+    }
+    if (field === "action URL") {
+      fixture.actions = [
+        { id: "docs", label: "Docs", url: `./docs${control}.html` },
+      ];
+    }
+    expectParity(validateApp, parseToolboxApp, fixture, false);
+  });
+
   const acceptedCatalogs: Array<[string, () => Record<string, unknown>]> = [
     ["the baseline catalog", validCatalog],
     [
@@ -258,4 +311,45 @@ describe("canonical schema and runtime parser parity", () => {
   it.each(rejectedCatalogs)("rejects %s", (_label, fixture) => {
     expectParity(validateCatalog, parseToolboxCatalog, fixture(), false);
   });
+
+  it.each(asciiUrlControls)(
+    "rejects %s embedded in a catalog URL reference",
+    (_label, control) => {
+      expectParity(
+        validateCatalog,
+        parseToolboxCatalog,
+        { ...validCatalog(), home: `./before${control}after` },
+        false,
+      );
+    },
+  );
+
+  it.each([
+    ["TAB", "manifest", "\t"],
+    ["LF", "external entry", "\n"],
+    ["CR", "home", "\r"],
+    ["DEL", "manifest", "\u007f"],
+  ] as const)("rejects %s in a catalog %s URL", (_name, field, control) => {
+    const fixture = validCatalog();
+    if (field === "home") fixture.home = `./home${control}page`;
+    if (field === "manifest") {
+      fixture.apps = [
+        {
+          manifest: `./apps/example${control}/toolbox-app.json`,
+          enabled: true,
+        },
+      ];
+    }
+    if (field === "external entry") {
+      fixture.apps = [
+        {
+          name: "External",
+          entry: `https://example.test/tool${control}page`,
+          launch: "new-tab",
+          enabled: true,
+        },
+      ];
+    }
+    expectParity(validateCatalog, parseToolboxCatalog, fixture, false);
+  });
 });