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
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/dom/CSPEvalChecker.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/WorkerPrivate.h"
#include "mozilla/dom/WorkerRunnable.h"
#include "mozilla/BasePrincipal.h"
#include "mozilla/ErrorResult.h"
#include "nsIParentChannel.h"
#include "nsGlobalWindowInner.h"
#include "nsContentSecurityUtils.h"
#include "nsContentUtils.h"
#include "nsCOMPtr.h"
#include "nsJSUtils.h"
using namespace mozilla;
using namespace mozilla::dom;
namespace {
// We use the subjectPrincipal to assert that eval() is never
// executed in system privileged context.
nsresult CheckInternal(nsIContentSecurityPolicy* aCSP,
nsICSPEventListener* aCSPEventListener,
nsIPrincipal* aSubjectPrincipal,
const nsAString& aExpression,
const nsAString& aFileNameString, uint32_t aLineNum,
uint32_t aColumnNum, bool* aAllowed) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aAllowed);
// The value is set at any "return", but better to have a default value here.
*aAllowed = false;
#if !defined(ANDROID)
JSContext* cx = nsContentUtils::GetCurrentJSContext();
if (!nsContentSecurityUtils::IsEvalAllowed(
cx, aSubjectPrincipal->IsSystemPrincipal(), aExpression)) {
*aAllowed = false;
return NS_OK;
}
#endif
if (!aCSP) {
*aAllowed = true;
return NS_OK;
}
bool reportViolation = false;
nsresult rv = aCSP->GetAllowsEval(&reportViolation, aAllowed);
if (NS_WARN_IF(NS_FAILED(rv))) {
*aAllowed = false;
return rv;
}
if (reportViolation) {
aCSP->LogViolationDetails(nsIContentSecurityPolicy::VIOLATION_TYPE_EVAL,
nullptr, // triggering element
aCSPEventListener, aFileNameString, aExpression,
aLineNum, aColumnNum, u""_ns, u""_ns);
}
return NS_OK;
}
class WorkerCSPCheckRunnable final : public WorkerMainThreadRunnable {
public:
WorkerCSPCheckRunnable(WorkerPrivate* aWorkerPrivate,
const nsAString& aExpression,
const nsAString& aFileNameString, uint32_t aLineNum,
uint32_t aColumnNum)
: WorkerMainThreadRunnable(aWorkerPrivate, "CSP Eval Check"_ns),
mExpression(aExpression),
mFileNameString(aFileNameString),
mLineNum(aLineNum),
mColumnNum(aColumnNum),
mEvalAllowed(false) {}
bool MainThreadRun() override {
mResult = CheckInternal(
mWorkerPrivate->GetCSP(), mWorkerPrivate->CSPEventListener(),
mWorkerPrivate->GetLoadingPrincipal(), mExpression, mFileNameString,
mLineNum, mColumnNum, &mEvalAllowed);
return true;
}
nsresult GetResult(bool* aAllowed) {
MOZ_ASSERT(aAllowed);
*aAllowed = mEvalAllowed;
return mResult;
}
private:
const nsString mExpression;
const nsString mFileNameString;
const uint32_t mLineNum;
const uint32_t mColumnNum;
bool mEvalAllowed;
nsresult mResult;
};
} // namespace
/* static */
nsresult CSPEvalChecker::CheckForWindow(JSContext* aCx,
nsGlobalWindowInner* aWindow,
const nsAString& aExpression,
bool* aAllowEval) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aWindow);
MOZ_ASSERT(aAllowEval);
// The value is set at any "return", but better to have a default value here.
*aAllowEval = false;
// if CSP is enabled, and setTimeout/setInterval was called with a string,
// disable the registration and log an error
nsCOMPtr<Document> doc = aWindow->GetExtantDoc();
if (!doc) {
// if there's no document, we don't have to do anything.
*aAllowEval = true;
return NS_OK;
}
nsresult rv = NS_OK;
// Get the calling location.
uint32_t lineNum = 0;
uint32_t columnNum = 0;
nsAutoString fileNameString;
if (!nsJSUtils::GetCallingLocation(aCx, fileNameString, &lineNum,
&columnNum)) {
fileNameString.AssignLiteral("unknown");
}
nsCOMPtr<nsIContentSecurityPolicy> csp = doc->GetCsp();
rv = CheckInternal(csp, nullptr /* no CSPEventListener for window */,
doc->NodePrincipal(), aExpression, fileNameString, lineNum,
columnNum, aAllowEval);
if (NS_WARN_IF(NS_FAILED(rv))) {
*aAllowEval = false;
return rv;
}
return NS_OK;
}
/* static */
nsresult CSPEvalChecker::CheckForWorker(JSContext* aCx,
WorkerPrivate* aWorkerPrivate,
const nsAString& aExpression,
bool* aAllowEval) {
MOZ_ASSERT(aWorkerPrivate);
aWorkerPrivate->AssertIsOnWorkerThread();
MOZ_ASSERT(aAllowEval);
// The value is set at any "return", but better to have a default value here.
*aAllowEval = false;
// Get the calling location.
uint32_t lineNum = 0;
uint32_t columnNum = 0;
nsAutoString fileNameString;
if (!nsJSUtils::GetCallingLocation(aCx, fileNameString, &lineNum,
&columnNum)) {
fileNameString.AssignLiteral("unknown");
}
RefPtr<WorkerCSPCheckRunnable> r = new WorkerCSPCheckRunnable(
aWorkerPrivate, aExpression, fileNameString, lineNum, columnNum);
ErrorResult error;
r->Dispatch(Canceling, error);
if (NS_WARN_IF(error.Failed())) {
*aAllowEval = false;
return error.StealNSResult();
}
nsresult rv = r->GetResult(aAllowEval);
if (NS_WARN_IF(NS_FAILED(rv))) {
*aAllowEval = false;
return rv;
}
return NS_OK;
}
|
