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/**
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* Myext 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 url_item
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* IMPORT url_extract_policy
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* IMPORT get_query_best
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* IMPORT csp_rule
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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 = {
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"content-security-policy" : true,
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"x-webkit-csp" : true,
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"x-content-security-policy" : true
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};
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const header_name = "content-security-policy";
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function is_csp_header(header)
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{
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return !!csp_header_names[header.name.toLowerCase()];
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}
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function is_our_header(header, rule)
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{
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return header.value === rule
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}
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function url_inject(details)
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{
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const targets = url_extract_policy(details.url);
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if (targets.valid_sig) {
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return;
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} else if (targets.policy) {
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/* Redirect; update policy */
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targets.target = targets.target2;
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delete targets.target2
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}
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let [pattern, settings] = query_best(targets.base_url);
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if (!pattern)
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/* Defaults */
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settings = {};
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const policy = {allow: settings.allow, nonce: gen_nonce()};
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const policy_string = encodeURIComponent(JSON.stringify(policy));
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const sig = gen_unique(policy_string + targets.base_url);
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let redirect_url = targets.base_url + '#' + sig + policy_string;
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if (targets.target)
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redirect_url += targets.target;
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if (targets.target2)
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redirect_url += targets.target2;
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return {redirectUrl: redirect_url};
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}
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function inject(details)
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{
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const targets = url_extract_policy(details.url);
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if (!targets.valid_sig)
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/* Block unsigned requests */
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return {cancel: true};
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const rule = csp_rule(targets.policy.nonce);
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var headers = details.responseHeaders;
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if (!targets.policy.allow || is_mozilla)
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/*
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* Chrome doesn't have the buggy behavior of caching headers
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* we injected. Firefox does and we have to remove it there.
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*/
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headers = headers.filter(h => !is_csp_header(h));
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if (!targets.policy.allow)
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headers.push({
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name : header_name,
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value : rule
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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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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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* EXPORTS_START
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132
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* EXPORT start_policy_injector
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* EXPORTS_END
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*/
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