1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
/**
* This file is part of Haketilo.
*
* Function: Injecting policy to page by modifying HTTP headers.
*
* Copyright (C) 2021, Wojtek Kosior
* Copyright (C) 2021, jahoti
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* As additional permission under GNU GPL version 3 section 7, you
* may distribute forms of that code without the copy of the GNU
* GPL normally required by section 4, provided you include this
* license notice and, in case of non-source distribution, a URL
* through which recipients can access the Corresponding Source.
* If you modify file(s) with this exception, you may extend this
* exception to your version of the file(s), but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*
* As a special exception to the GPL, any HTML file which merely
* makes function calls to this code, and for that purpose
* includes it by reference shall be deemed a separate work for
* copyright law purposes. If you modify this code, you may extend
* this exception to your version of the code, but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*
* I, Wojtek Kosior, thereby promise not to sue for violation of this file's
* license. Although I request that you do not make use this code in a
* proprietary program, I am not going to enforce this in court.
*/
/*
* IMPORTS_START
* IMPORT sign_data
* IMPORT extract_signed
* IMPORT make_csp_rule
* IMPORT csp_header_regex
* IMPORTS_END
*/
function inject_csp_headers(headers, policy)
{
let csp_headers;
let old_signature;
let haketilo_header;
for (const header of headers.filter(h => h.name === "x-haketilo")) {
/* x-haketilo header has format: <signature>_0_<data> */
const match = /^([^_]+)_(0_.*)$/.exec(header.value);
if (!match)
continue;
const result = extract_signed(...match.slice(1, 3));
if (result.fail)
continue;
/* This should succeed - it's our self-produced valid JSON. */
const old_data = JSON.parse(decodeURIComponent(result.data));
/* Confirmed- it's the originals, smuggled in! */
csp_headers = old_data.csp_headers;
old_signature = old_data.policy_sig;
haketilo_header = header;
break;
}
if (policy.has_payload) {
csp_headers = [];
const non_csp_headers = [];
const header_list =
h => csp_header_regex.test(h) ? csp_headers : non_csp_headers;
headers.forEach(h => header_list(h.name).push(h));
headers = non_csp_headers;
} else {
headers.push(...csp_headers || []);
}
if (!haketilo_header) {
haketilo_header = {name: "x-haketilo"};
headers.push(haketilo_header);
}
if (old_signature)
headers = headers.filter(h => h.value.search(old_signature) === -1);
const policy_str = encodeURIComponent(JSON.stringify(policy));
const signed_policy = sign_data(policy_str, new Date().getTime());
const later_30sec = new Date(new Date().getTime() + 30000).toGMTString();
headers.push({
name: "Set-Cookie",
value: `haketilo-${signed_policy.join("=")}; Expires=${later_30sec};`
});
/*
* Smuggle in the signature and the original CSP headers for future use.
* These are signed with a time of 0, as it's not clear there is a limit on
* how long Firefox might retain headers in the cache.
*/
let haketilo_data = {csp_headers, policy_sig: signed_policy[0]};
haketilo_data = encodeURIComponent(JSON.stringify(haketilo_data));
haketilo_header.value = sign_data(haketilo_data, 0).join("_");
if (!policy.allow) {
headers.push({
name: "content-security-policy",
value: make_csp_rule(policy)
});
}
return headers;
}
/*
* EXPORTS_START
* EXPORT inject_csp_headers
* EXPORTS_END
*/
|
