|
1
|
/**
|
|
2
|
* Hachette injecting policy to page using webRequest
|
|
3
|
*
|
|
4
|
* Copyright (C) 2021 Wojtek Kosior
|
|
5
|
* Copyright (C) 2021 jahoti
|
|
6
|
* Redistribution terms are gathered in the `copyright' file.
|
|
7
|
*/
|
|
8
|
|
|
9
|
/*
|
|
10
|
* IMPORTS_START
|
|
11
|
* IMPORT TYPE_PREFIX
|
|
12
|
* IMPORT get_storage
|
|
13
|
* IMPORT browser
|
|
14
|
* IMPORT is_chrome
|
|
15
|
* IMPORT gen_unique
|
|
16
|
* IMPORT gen_nonce
|
|
17
|
* IMPORT is_privileged_url
|
|
18
|
* IMPORT url_extract_target
|
|
19
|
* IMPORT sign_policy
|
|
20
|
* IMPORT get_query_best
|
|
21
|
* IMPORT parse_csp
|
|
22
|
* IMPORTS_END
|
|
23
|
*/
|
|
24
|
|
|
25
|
var storage;
|
|
26
|
var query_best;
|
|
27
|
|
|
28
|
const csp_header_names = {
|
|
29
|
"content-security-policy" : true,
|
|
30
|
"x-webkit-csp" : true,
|
|
31
|
"x-content-security-policy" : true
|
|
32
|
};
|
|
33
|
|
|
34
|
const unwanted_csp_directives = {
|
|
35
|
"report-to" : true,
|
|
36
|
"report-uri" : true,
|
|
37
|
"script-src" : true,
|
|
38
|
"script-src-elem" : true,
|
|
39
|
"prefetch-src": true
|
|
40
|
};
|
|
41
|
|
|
42
|
const header_name = "content-security-policy";
|
|
43
|
|
|
44
|
function not_csp_header(header)
|
|
45
|
{
|
|
46
|
return !csp_header_names[header.name.toLowerCase()];
|
|
47
|
}
|
|
48
|
|
|
49
|
function url_inject(details)
|
|
50
|
{
|
|
51
|
if (is_privileged_url(details.url))
|
|
52
|
return;
|
|
53
|
|
|
54
|
const targets = url_extract_target(details.url);
|
|
55
|
if (targets.current)
|
|
56
|
return;
|
|
57
|
|
|
58
|
/* Redirect; update policy */
|
|
59
|
if (targets.policy)
|
|
60
|
targets.target = "";
|
|
61
|
|
|
62
|
let [pattern, settings] = query_best(targets.base_url);
|
|
63
|
/* Defaults */
|
|
64
|
if (!pattern)
|
|
65
|
settings = {};
|
|
66
|
|
|
67
|
const policy = encodeURIComponent(
|
|
68
|
JSON.stringify({
|
|
69
|
allow: settings.allow,
|
|
70
|
nonce: gen_nonce(),
|
|
71
|
base_url: targets.base_url
|
|
72
|
})
|
|
73
|
);
|
|
74
|
|
|
75
|
return {
|
|
76
|
redirectUrl: [
|
|
77
|
targets.base_url,
|
|
78
|
'#', sign_policy(policy, new Date()), policy,
|
|
79
|
targets.target,
|
|
80
|
targets.target2
|
|
81
|
].join("")
|
|
82
|
};
|
|
83
|
}
|
|
84
|
|
|
85
|
function headers_inject(details)
|
|
86
|
{
|
|
87
|
const targets = url_extract_target(details.url);
|
|
88
|
/* Block mis-/unsigned requests */
|
|
89
|
if (!targets.current)
|
|
90
|
return {cancel: true};
|
|
91
|
|
|
92
|
const headers = [];
|
|
93
|
for (let header of details.responseHeaders) {
|
|
94
|
if (not_csp_header(header)) {
|
|
95
|
/* Retain all non-snitching headers */
|
|
96
|
if (header.name.toLowerCase() !==
|
|
97
|
'content-security-policy-report-only')
|
|
98
|
headers.push(header);
|
|
99
|
|
|
100
|
continue;
|
|
101
|
}
|
|
102
|
|
|
103
|
const csp = parse_csp(header.value);
|
|
104
|
const rule = `'nonce-${targets.policy.nonce}'`
|
|
105
|
|
|
106
|
/* TODO: confirm deleting non-existent things is OK everywhere */
|
|
107
|
/* No snitching or prefetching/rendering */
|
|
108
|
delete csp['report-to'];
|
|
109
|
delete csp['report-uri'];
|
|
110
|
|
|
111
|
if (!targets.policy.allow) {
|
|
112
|
delete csp['script-src'];
|
|
113
|
delete csp['script-src-elem'];
|
|
114
|
csp['script-src-attr'] = ["'none'"];
|
|
115
|
csp['prefetch-src'] = ["'none'"];
|
|
116
|
}
|
|
117
|
|
|
118
|
if ('script-src' in csp)
|
|
119
|
csp['script-src'].push(rule);
|
|
120
|
else
|
|
121
|
csp['script-src'] = [rule];
|
|
122
|
|
|
123
|
if ('script-src-elem' in csp)
|
|
124
|
csp['script-src-elem'].push(rule);
|
|
125
|
else
|
|
126
|
csp['script-src-elem'] = [rule];
|
|
127
|
|
|
128
|
/* TODO: is this safe */
|
|
129
|
let new_policy = Object.entries(csp).map(
|
|
130
|
i => i[0] + ' ' + i[1].join(' ') + ';'
|
|
131
|
);
|
|
132
|
|
|
133
|
headers.push({name: header.name, value: new_policy.join('')});
|
|
134
|
}
|
|
135
|
|
|
136
|
return {responseHeaders: headers};
|
|
137
|
}
|
|
138
|
|
|
139
|
async function start_policy_injector()
|
|
140
|
{
|
|
141
|
storage = await get_storage();
|
|
142
|
query_best = await get_query_best();
|
|
143
|
|
|
144
|
let extra_opts = ["blocking", "responseHeaders"];
|
|
145
|
if (is_chrome)
|
|
146
|
extra_opts.push("extraHeaders");
|
|
147
|
|
|
148
|
browser.webRequest.onBeforeRequest.addListener(
|
|
149
|
url_inject,
|
|
150
|
{
|
|
151
|
urls: ["<all_urls>"],
|
|
152
|
types: ["main_frame", "sub_frame"]
|
|
153
|
},
|
|
154
|
["blocking"]
|
|
155
|
);
|
|
156
|
|
|
157
|
browser.webRequest.onHeadersReceived.addListener(
|
|
158
|
headers_inject,
|
|
159
|
{
|
|
160
|
urls: ["<all_urls>"],
|
|
161
|
types: ["main_frame", "sub_frame"]
|
|
162
|
},
|
|
163
|
extra_opts
|
|
164
|
);
|
|
165
|
}
|
|
166
|
|
|
167
|
/*
|
|
168
|
* EXPORTS_START
|
|
169
|
* EXPORT start_policy_injector
|
|
170
|
* EXPORTS_END
|
|
171
|
*/
|