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/**
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* Hachette injecting policy to page using webRequest
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*
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* Copyright (C) 2021 Wojtek Kosior
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* Copyright (C) 2021 jahoti
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* Redistribution terms are gathered in the `copyright' file.
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*/
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/*
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* IMPORTS_START
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* IMPORT TYPE_PREFIX
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* IMPORT get_storage
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* IMPORT browser
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* IMPORT is_chrome
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* IMPORT is_mozilla
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* IMPORT gen_unique
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* IMPORT gen_nonce
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* IMPORT is_privileged_url
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* IMPORT url_extract_target
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* IMPORT sign_policy
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* IMPORT get_query_best
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* IMPORT sanitize_csp_header
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* IMPORTS_END
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*/
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var storage;
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var query_best;
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const csp_header_names = new Set([
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"content-security-policy",
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"x-webkit-csp",
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"x-content-security-policy"
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]);
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/* TODO: variable no longer in use; remove if not needed */
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const unwanted_csp_directives = new Set([
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"report-to",
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"report-uri",
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"script-src",
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"script-src-elem",
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"prefetch-src"
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]);
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const report_only = "content-security-policy-report-only";
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function url_inject(details)
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{
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if (is_privileged_url(details.url))
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return;
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const targets = url_extract_target(details.url);
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if (targets.current)
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return;
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/* Redirect; update policy */
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if (targets.policy)
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targets.target = "";
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let [pattern, settings] = query_best(targets.base_url);
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/* Defaults */
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if (!pattern)
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settings = {};
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const policy = encodeURIComponent(
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JSON.stringify({
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allow: settings.allow,
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nonce: gen_nonce(),
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base_url: targets.base_url
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})
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);
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return {
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redirectUrl: [
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targets.base_url,
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'#', sign_policy(policy, new Date()), policy,
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targets.target,
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targets.target2
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].join("")
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};
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}
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function headers_inject(details)
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{
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const targets = url_extract_target(details.url);
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/* Block mis-/unsigned requests */
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if (!targets.current)
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return {cancel: true};
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let orig_csp_headers = is_chrome ? null : [];
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let headers = [];
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let csp_headers = is_chrome ? headers : [];
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const rule = `'nonce-${targets.policy.nonce}'`;
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const block = !targets.policy.allow;
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for (const header of details.responseHeaders) {
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if (!csp_header_names.has(header)) {
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/* Remove headers that only snitch on us */
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if (header.name.toLowerCase() === report_only && block)
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continue;
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headers.push(header);
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/* If these are the original CSP headers, use them instead */
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/* Test based on url_extract_target() in misc.js */
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if (is_mozilla && header.name === "x-orig-csp") {
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let index = header.value.indexOf('%5B');
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if (index === -1)
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continue;
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let sig = header.value.substring(0, index);
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let data = header.value.substring(index);
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if (sig !== sign_policy(data, 0))
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continue;
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/* Confirmed- it's the originals, smuggled in! */
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try {
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data = JSON.parse(decodeURIComponent(data));
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} catch (e) {
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/* This should not be reached -
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it's our self-produced valid JSON. */
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console.log("Unexpected internal error - invalid JSON smuggled!", e);
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}
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orig_csp_headers = csp_headers = null;
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for (const header of data)
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headers.push(sanitize_csp_header(header, rule, block));
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}
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} else if (is_chrome || !orig_csp_headers) {
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csp_headers.push(sanitize_csp_header(header, rule, block));
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if (is_mozilla)
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orig_csp_headers.push(header);
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}
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}
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if (orig_csp_headers) {
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/** Smuggle in the original CSP headers for future use.
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* These are signed with a time of 0, as it's not clear there
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* is a limit on how long Firefox might retain these headers in
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* the cache.
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*/
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orig_csp_headers = encodeURIComponent(JSON.stringify(orig_csp_headers));
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headers.push({
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name: "x-orig-csp",
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value: sign_policy(orig_csp_headers, 0) + orig_csp_headers
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});
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headers = headers.concat(csp_headers);
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}
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/* To ensure there is a CSP header if required */
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if (block) {
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headers.push({
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name: "content-security-policy",
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value: `script-src ${rule}; script-src-elem ${rule}; ` +
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"script-src-attr 'none'; prefetch-src 'none';"
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});
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}
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return {responseHeaders: headers};
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}
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async function start_policy_injector()
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{
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storage = await get_storage();
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query_best = await get_query_best();
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let extra_opts = ["blocking", "responseHeaders"];
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if (is_chrome)
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extra_opts.push("extraHeaders");
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browser.webRequest.onBeforeRequest.addListener(
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url_inject,
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{
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urls: ["<all_urls>"],
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types: ["main_frame", "sub_frame"]
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},
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["blocking"]
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);
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browser.webRequest.onHeadersReceived.addListener(
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headers_inject,
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{
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urls: ["<all_urls>"],
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types: ["main_frame", "sub_frame"]
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},
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extra_opts
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);
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}
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/*
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191
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* EXPORTS_START
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192
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* EXPORT start_policy_injector
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193
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* EXPORTS_END
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194
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*/
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