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
133
|
# SPDX-License-Identifier: GPL-3.0-or-later
# Policies for blocking and allowing JS in pages fetched with HTTP.
#
# This file is part of Hydrilla&Haketilo.
#
# Copyright (C) 2022 Wojtek Kosior
#
# 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.
#
# 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 of this
# code in a proprietary program, I am not going to enforce this in
# court.
"""
.....
"""
import dataclasses as dc
import typing as t
from ...url_patterns import ParsedPattern
from .. import csp
from .. import state
from ..import http_messages
from . import base
class AllowPolicy(base.Policy):
"""...."""
priority: t.ClassVar[base.PolicyPriority] = base.PolicyPriority._TWO
class BlockPolicy(base.Policy):
"""...."""
_process_response: t.ClassVar[bool] = True
priority: t.ClassVar[base.PolicyPriority] = base.PolicyPriority._TWO
def _modify_headers(self, response_info: http_messages.ResponseInfo) \
-> t.Iterable[tuple[bytes, bytes]]:
"""...."""
csp_policies = csp.extract(response_info.headers)
for header_name, header_value in response_info.headers.items():
if header_name.lower() not in csp.header_names_and_dispositions:
yield header_name.encode(), header_value.encode()
for policy in csp_policies:
if policy.disposition != 'enforce':
continue
directives = policy.directives.mutate()
directives.pop('report-to', None)
directives.pop('report-uri', None)
policy = dc.replace(policy, directives=directives.finish())
yield policy.header_name.encode(), policy.serialize().encode()
extra_csp = ';'.join((
"script-src 'none'",
"script-src-elem 'none'",
"script-src-attr 'none'"
))
yield b'Content-Security-Policy', extra_csp.encode()
def consume_response(self, response_info: http_messages.ResponseInfo) \
-> http_messages.ProducedResponse:
"""...."""
new_response = response_info.make_produced_response()
new_headers = self._modify_headers(response_info)
return dc.replace(new_response, headers=new_headers)
@dc.dataclass(frozen=True)
class RuleAllowPolicy(AllowPolicy):
"""...."""
pattern: ParsedPattern
@dc.dataclass(frozen=True)
class RuleBlockPolicy(BlockPolicy):
"""...."""
pattern: ParsedPattern
@dc.dataclass(frozen=True, unsafe_hash=True) # type: ignore[misc]
class RulePolicyFactory(base.PolicyFactory):
"""...."""
pattern: ParsedPattern
def __lt__(self, other: base.PolicyFactory) -> bool:
"""...."""
if type(other) is not type(self):
return super().__lt__(other)
assert isinstance(other, RulePolicyFactory)
return self.pattern < other.pattern
@dc.dataclass(frozen=True, unsafe_hash=True) # type: ignore[misc]
class RuleBlockPolicyFactory(RulePolicyFactory):
"""...."""
def make_policy(self, haketilo_state: state.HaketiloState) \
-> RuleBlockPolicy:
"""...."""
return RuleBlockPolicy(self.pattern)
@dc.dataclass(frozen=True, unsafe_hash=True) # type: ignore[misc]
class RuleAllowPolicyFactory(RulePolicyFactory):
"""...."""
def make_policy(self, haketilo_state: state.HaketiloState) \
-> RuleAllowPolicy:
"""...."""
return RuleAllowPolicy(self.pattern)
|
