1 |
702eefd2
|
Wojtek Kosior
|
/**
|
2 |
|
|
* This file is part of Haketilo.
|
3 |
|
|
*
|
4 |
|
|
* Function: Modify HTTP traffic usng webRequest API.
|
5 |
|
|
*
|
6 |
|
|
* Copyright (C) 2021 Wojtek Kosior <koszko@koszko.org>
|
7 |
|
|
*
|
8 |
|
|
* This program is free software: you can redistribute it and/or modify
|
9 |
|
|
* it under the terms of the GNU General Public License as published by
|
10 |
|
|
* the Free Software Foundation, either version 3 of the License, or
|
11 |
|
|
* (at your option) any later version.
|
12 |
|
|
*
|
13 |
|
|
* This program is distributed in the hope that it will be useful,
|
14 |
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
15 |
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
16 |
|
|
* GNU General Public License for more details.
|
17 |
|
|
*
|
18 |
|
|
* As additional permission under GNU GPL version 3 section 7, you
|
19 |
|
|
* may distribute forms of that code without the copy of the GNU
|
20 |
|
|
* GPL normally required by section 4, provided you include this
|
21 |
|
|
* license notice and, in case of non-source distribution, a URL
|
22 |
|
|
* through which recipients can access the Corresponding Source.
|
23 |
|
|
* If you modify file(s) with this exception, you may extend this
|
24 |
|
|
* exception to your version of the file(s), but you are not
|
25 |
|
|
* obligated to do so. If you do not wish to do so, delete this
|
26 |
|
|
* exception statement from your version.
|
27 |
|
|
*
|
28 |
|
|
* As a special exception to the GPL, any HTML file which merely
|
29 |
|
|
* makes function calls to this code, and for that purpose
|
30 |
|
|
* includes it by reference shall be deemed a separate work for
|
31 |
|
|
* copyright law purposes. If you modify this code, you may extend
|
32 |
|
|
* this exception to your version of the code, but you are not
|
33 |
|
|
* obligated to do so. If you do not wish to do so, delete this
|
34 |
|
|
* exception statement from your version.
|
35 |
|
|
*
|
36 |
|
|
* You should have received a copy of the GNU General Public License
|
37 |
|
|
* along with this program. If not, see <https://www.gnu.org/licenses/>.
|
38 |
|
|
*
|
39 |
|
|
* I, Wojtek Kosior, thereby promise not to sue for violation of this file's
|
40 |
372d24ea
|
Wojtek Kosior
|
* license. Although I request that you do not make use of this code in a
|
41 |
702eefd2
|
Wojtek Kosior
|
* proprietary program, I am not going to enforce this in court.
|
42 |
|
|
*/
|
43 |
|
|
|
44 |
|
|
#IMPORT common/indexeddb.js AS haketilodb
|
45 |
|
|
#IF MOZILLA
|
46 |
|
|
#IMPORT background/stream_filter.js
|
47 |
|
|
#ENDIF
|
48 |
|
|
|
49 |
|
|
#FROM common/browser.js IMPORT browser
|
50 |
|
|
#FROM common/misc.js IMPORT is_privileged_url, csp_header_regex
|
51 |
|
|
#FROM common/policy.js IMPORT decide_policy
|
52 |
|
|
|
53 |
9d825eaa
|
Wojtek Kosior
|
#FROM background/patterns_query_manager.js IMPORT tree, default_allow
|
54 |
702eefd2
|
Wojtek Kosior
|
|
55 |
|
|
let secret;
|
56 |
|
|
|
57 |
|
|
function on_headers_received(details)
|
58 |
|
|
{
|
59 |
|
|
const url = details.url;
|
60 |
|
|
if (is_privileged_url(details.url))
|
61 |
|
|
return;
|
62 |
|
|
|
63 |
|
|
let headers = details.responseHeaders;
|
64 |
|
|
|
65 |
9d825eaa
|
Wojtek Kosior
|
const policy =
|
66 |
|
|
decide_policy(tree, details.url, !!default_allow.value, secret);
|
67 |
702eefd2
|
Wojtek Kosior
|
if (policy.allow)
|
68 |
|
|
return;
|
69 |
|
|
|
70 |
|
|
if (policy.payload)
|
71 |
|
|
headers = headers.filter(h => !csp_header_regex.test(h.name));
|
72 |
|
|
|
73 |
|
|
headers.push({name: "Content-Security-Policy", value: policy.csp});
|
74 |
|
|
|
75 |
|
|
#IF MOZILLA
|
76 |
|
|
let skip = false;
|
77 |
|
|
for (const header of headers) {
|
78 |
|
|
if (header.name.toLowerCase().trim() !== "content-disposition")
|
79 |
|
|
continue;
|
80 |
|
|
|
81 |
|
|
if (/^\s*attachment\s*(;.*)$/i.test(header.value)) {
|
82 |
|
|
skip = true;
|
83 |
|
|
} else {
|
84 |
|
|
skip = false;
|
85 |
|
|
break;
|
86 |
|
|
}
|
87 |
|
|
}
|
88 |
|
|
skip = skip || (details.statusCode >= 300 && details.statusCode < 400);
|
89 |
|
|
|
90 |
|
|
if (!skip)
|
91 |
|
|
headers = stream_filter.apply(details, headers, policy);
|
92 |
|
|
#ENDIF
|
93 |
|
|
|
94 |
|
|
return {responseHeaders: headers};
|
95 |
|
|
}
|
96 |
|
|
|
97 |
|
|
#IF CHROMIUM && MV2
|
98 |
|
|
const request_url_regex = /^[^?]*\?url=(.*)$/;
|
99 |
|
|
const redirect_url_template = browser.runtime.getURL("dummy") + "?settings=";
|
100 |
|
|
|
101 |
|
|
function on_before_request(details)
|
102 |
|
|
{
|
103 |
|
|
/*
|
104 |
|
|
* Content script will make a synchronous XmlHttpRequest to extension's
|
105 |
|
|
* `dummy` file to query settings for given URL. We smuggle that
|
106 |
|
|
* information in query parameter of the URL we redirect to.
|
107 |
|
|
* A risk of fingerprinting arises if a page with script execution allowed
|
108 |
|
|
* guesses the dummy file URL and makes an AJAX call to it. It is currently
|
109 |
|
|
* a problem in ManifestV2 Chromium-family port of Haketilo because Chromium
|
110 |
|
|
* uses predictable URLs for web-accessible resources. We plan to fix it in
|
111 |
|
|
* the future ManifestV3 port.
|
112 |
|
|
*/
|
113 |
|
|
if (details.type !== "xmlhttprequest")
|
114 |
|
|
return {cancel: true};
|
115 |
|
|
|
116 |
|
|
#IF DEBUG
|
117 |
|
|
console.debug(`Settings queried using XHR for '${details.url}'.`);
|
118 |
|
|
#ENDIF
|
119 |
|
|
|
120 |
|
|
/*
|
121 |
|
|
* request_url should be of the following format:
|
122 |
|
|
* <url_for_extension's_dummy_file>?url=<valid_urlencoded_url>
|
123 |
|
|
*/
|
124 |
|
|
const match = request_url_regex.exec(details.url);
|
125 |
|
|
if (match) {
|
126 |
|
|
const queried_url = decodeURIComponent(match[1]);
|
127 |
|
|
|
128 |
|
|
if (details.initiator && !queried_url.startsWith(details.initiator)) {
|
129 |
|
|
console.warn(`Blocked suspicious query of '${url}' by '${details.initiator}'. This might be the result of page fingerprinting the browser.`);
|
130 |
|
|
return {cancel: true};
|
131 |
|
|
}
|
132 |
|
|
|
133 |
|
|
const policy = decide_policy(tree, details.url, default_allow, secret);
|
134 |
|
|
if (!policy.error) {
|
135 |
|
|
const encoded_policy = encodeURIComponent(JSON.stringify(policy));
|
136 |
|
|
return {redirectUrl: redirect_url_template + encoded_policy};
|
137 |
|
|
}
|
138 |
|
|
}
|
139 |
|
|
|
140 |
|
|
console.warn(`Bad request! Expected ${browser.runtime.getURL("dummy")}?url=<valid_urlencoded_url>. Got ${request_url}. This might be the result of page fingerprinting the browser.`);
|
141 |
|
|
|
142 |
|
|
return {cancel: true};
|
143 |
|
|
}
|
144 |
|
|
|
145 |
|
|
const all_types = [
|
146 |
|
|
"main_frame", "sub_frame", "stylesheet", "script", "image", "font",
|
147 |
|
|
"object", "xmlhttprequest", "ping", "csp_report", "media", "websocket",
|
148 |
|
|
"other", "main_frame", "sub_frame"
|
149 |
|
|
];
|
150 |
|
|
#ENDIF
|
151 |
|
|
|
152 |
|
|
async function start(secret_)
|
153 |
|
|
{
|
154 |
|
|
secret = secret_;
|
155 |
|
|
|
156 |
|
|
#IF CHROMIUM
|
157 |
|
|
const extra_opts = ["blocking", "extraHeaders"];
|
158 |
|
|
#ELSE
|
159 |
|
|
const extra_opts = ["blocking"];
|
160 |
|
|
#ENDIF
|
161 |
|
|
|
162 |
|
|
browser.webRequest.onHeadersReceived.addListener(
|
163 |
|
|
on_headers_received,
|
164 |
|
|
{urls: ["<all_urls>"], types: ["main_frame", "sub_frame"]},
|
165 |
|
|
extra_opts.concat("responseHeaders")
|
166 |
|
|
);
|
167 |
|
|
|
168 |
|
|
#IF CHROMIUM && MV2
|
169 |
|
|
browser.webRequest.onBeforeRequest.addListener(
|
170 |
|
|
on_before_request,
|
171 |
|
|
{urls: [browser.runtime.getURL("dummy") + "*"], types: all_types},
|
172 |
|
|
extra_opts
|
173 |
|
|
);
|
174 |
|
|
#ENDIF
|
175 |
|
|
}
|
176 |
|
|
#EXPORT start
|