|
1
|
/**
|
|
2
|
* Myext injecting policy to page using webRequest
|
|
3
|
*
|
|
4
|
* Copyright (C) 2021 Wojtek Kosior
|
|
5
|
* Redistribution terms are gathered in the `copyright' file.
|
|
6
|
*/
|
|
7
|
|
|
8
|
/*
|
|
9
|
* IMPORTS_START
|
|
10
|
* IMPORT TYPE_PREFIX
|
|
11
|
* IMPORT get_storage
|
|
12
|
* IMPORT browser
|
|
13
|
* IMPORT is_chrome
|
|
14
|
* IMPORT retrieve_nonce
|
|
15
|
* IMPORT url_item
|
|
16
|
* IMPORT get_query_best
|
|
17
|
* IMPORT csp_rule
|
|
18
|
* IMPORTS_END
|
|
19
|
*/
|
|
20
|
|
|
21
|
var storage;
|
|
22
|
var query_best;
|
|
23
|
|
|
24
|
const csp_header_names = {
|
|
25
|
"content-security-policy" : true,
|
|
26
|
"x-webkit-csp" : true,
|
|
27
|
"x-content-security-policy" : true
|
|
28
|
};
|
|
29
|
|
|
30
|
const header_name = "content-security-policy";
|
|
31
|
|
|
32
|
function is_csp_header(header)
|
|
33
|
{
|
|
34
|
return !!csp_header_names[header.name.toLowerCase()];
|
|
35
|
}
|
|
36
|
|
|
37
|
function is_our_header(header, rule)
|
|
38
|
{
|
|
39
|
return header.value === rule
|
|
40
|
}
|
|
41
|
|
|
42
|
function inject(details)
|
|
43
|
{
|
|
44
|
const url = url_item(details.url);
|
|
45
|
|
|
46
|
const [pattern, settings] = query_best(url);
|
|
47
|
|
|
48
|
const nonce = retrieve_nonce(details.tabId, details.frameId, true);
|
|
49
|
const rule = csp_rule(nonce);
|
|
50
|
|
|
51
|
var headers;
|
|
52
|
|
|
53
|
if (settings !== undefined && settings.allow) {
|
|
54
|
/*
|
|
55
|
* Chrome doesn't have the buggy behavior of repeatedly injecting a
|
|
56
|
* header we injected once. Firefox does and we have to remove it there.
|
|
57
|
*/
|
|
58
|
if (is_chrome)
|
|
59
|
return {cancel: false};
|
|
60
|
|
|
61
|
headers = details.responseHeaders.filter(h => !is_our_header(h, rule));
|
|
62
|
} else {
|
|
63
|
headers = details.responseHeaders.filter(h => !is_csp_header(h));
|
|
64
|
|
|
65
|
headers.push({
|
|
66
|
name : header_name,
|
|
67
|
value : rule
|
|
68
|
});
|
|
69
|
}
|
|
70
|
|
|
71
|
return {responseHeaders: headers};
|
|
72
|
}
|
|
73
|
|
|
74
|
async function start_policy_injector()
|
|
75
|
{
|
|
76
|
storage = await get_storage();
|
|
77
|
query_best = await get_query_best();
|
|
78
|
|
|
79
|
let extra_opts = ["blocking", "responseHeaders"];
|
|
80
|
if (is_chrome)
|
|
81
|
extra_opts.push("extraHeaders");
|
|
82
|
|
|
83
|
browser.webRequest.onHeadersReceived.addListener(
|
|
84
|
inject,
|
|
85
|
{
|
|
86
|
urls: ["<all_urls>"],
|
|
87
|
types: ["main_frame", "sub_frame"]
|
|
88
|
},
|
|
89
|
extra_opts
|
|
90
|
);
|
|
91
|
}
|
|
92
|
|
|
93
|
/*
|
|
94
|
* EXPORTS_START
|
|
95
|
* EXPORT start_policy_injector
|
|
96
|
* EXPORTS_END
|
|
97
|
*/
|