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/**
* Myext injecting policy to page using webRequest
*
* Copyright (C) 2021 Wojtek Kosior
* Copyright (C) 2021 jahoti
* Redistribution terms are gathered in the `copyright' file.
*/
/*
* IMPORTS_START
* IMPORT TYPE_PREFIX
* IMPORT get_storage
* IMPORT browser
* IMPORT is_chrome
* IMPORT is_mozilla
* IMPORT gen_unique
* IMPORT gen_nonce
* IMPORT is_privileged_url
* IMPORT url_item
* IMPORT url_extract_target
* IMPORT sign_policy
* IMPORT get_query_best
* IMPORT csp_rule
* IMPORTS_END
*/
var storage;
var query_best;
const csp_header_names = {
"content-security-policy" : true,
"x-webkit-csp" : true,
"x-content-security-policy" : true
};
const header_name = "content-security-policy";
function is_csp_header(header)
{
return !!csp_header_names[header.name.toLowerCase()];
}
function url_inject(details)
{
if (is_privileged_url(details.url))
return;
const targets = url_extract_target(details.url);
if (targets.current)
return;
/* Redirect; update policy */
if (targets.policy)
targets.target = "";
let [pattern, settings] = query_best(targets.base_url);
/* Defaults */
if (!pattern)
settings = {};
const policy = encodeURIComponent(
JSON.stringify({
allow: settings.allow,
nonce: gen_nonce(),
base_url: targets.base_url
})
);
return {
redirectUrl: [
targets.base_url,
'#', sign_policy(policy, new Date()), policy,
targets.target,
targets.target2
].join("")
};
}
function headers_inject(details)
{
const targets = url_extract_target(details.url);
/* Block mis-/unsigned requests */
if (!targets.current)
return {cancel: true};
const rule = csp_rule(targets.policy.nonce);
var headers = details.responseHeaders;
/*
* Chrome doesn't have the buggy behavior of caching headers
* we injected. Firefox does and we have to remove it there.
*/
if (!targets.policy.allow || is_mozilla)
headers = headers.filter(h => !is_csp_header(h));
if (!targets.policy.allow) {
headers.push({
name : header_name,
value : rule
});
}
return {responseHeaders: headers};
}
async function start_policy_injector()
{
storage = await get_storage();
query_best = await get_query_best();
let extra_opts = ["blocking", "responseHeaders"];
if (is_chrome)
extra_opts.push("extraHeaders");
browser.webRequest.onBeforeRequest.addListener(
url_inject,
{
urls: ["<all_urls>"],
types: ["main_frame", "sub_frame"]
},
["blocking"]
);
browser.webRequest.onHeadersReceived.addListener(
headers_inject,
{
urls: ["<all_urls>"],
types: ["main_frame", "sub_frame"]
},
extra_opts
);
}
/*
* EXPORTS_START
* EXPORT start_policy_injector
* EXPORTS_END
*/
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