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/*
* Copyright (C) 2023 Apple Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "SourceTaintedOrigin.h"
#include "CodeBlock.h"
#include "StackVisitor.h"
#include "VM.h"
namespace JSC {
String sourceTaintedOriginToString(SourceTaintedOrigin taintedness)
{
switch (taintedness) {
case SourceTaintedOrigin::Untainted: return "Untainted"_s;
case SourceTaintedOrigin::KnownTainted: return "KnownTainted"_s;
case SourceTaintedOrigin::IndirectlyTainted: return "IndirectlyTainted"_s;
case SourceTaintedOrigin::IndirectlyTaintedByHistory: return "IndirectlyTaintedByHistory"_s;
default: break;
}
RELEASE_ASSERT_NOT_REACHED();
return { };
}
std::pair<SourceTaintedOrigin, URL> sourceTaintedOriginFromStack(VM& vm, CallFrame* callFrame)
{
if (!vm.mightBeExecutingTaintedCode())
return { SourceTaintedOrigin::Untainted, { } };
SourceTaintedOrigin result = SourceTaintedOrigin::IndirectlyTaintedByHistory;
URL sourceURL;
StackVisitor::visit(callFrame, vm, [&] (StackVisitor& visitor) -> IterationStatus {
if (!visitor->codeBlock() || !visitor->codeBlock()->couldBeTainted())
return IterationStatus::Continue;
auto* sourceProvider = visitor->codeBlock()->source().provider();
result = std::max(result, sourceProvider->sourceTaintedOrigin());
if (result != SourceTaintedOrigin::KnownTainted)
return IterationStatus::Continue;
sourceURL = sourceProvider->sourceOrigin().url();
return IterationStatus::Done;
});
return { result, WTFMove(sourceURL) };
}
SourceTaintedOrigin computeNewSourceTaintedOriginFromStack(VM& vm, CallFrame* callFrame)
{
if (!vm.mightBeExecutingTaintedCode())
return SourceTaintedOrigin::Untainted;
SourceTaintedOrigin result = SourceTaintedOrigin::IndirectlyTaintedByHistory;
StackVisitor::visit(callFrame, vm, [&] (StackVisitor& visitor) -> IterationStatus {
if (visitor->codeBlock() && visitor->codeBlock()->couldBeTainted()) {
SourceTaintedOrigin currentTaintedOrigin = visitor->codeBlock()->source().provider()->sourceTaintedOrigin();
if (currentTaintedOrigin >= SourceTaintedOrigin::IndirectlyTainted) {
result = SourceTaintedOrigin::IndirectlyTainted;
return IterationStatus::Done;
}
}
return IterationStatus::Continue;
});
return result;
}
} // namespace JSC
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