third_party/WebKit/Source/bindings/core/v8/BindingSecurity.cpp

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#include "bindings/core/v8/BindingSecurity.h"

#include "bindings/core/v8/V8Binding.h"
#include "core/dom/Document.h"
#include "core/frame/LocalDOMWindow.h"
#include "core/frame/LocalFrame.h"
#include "core/frame/Location.h"
#include "core/frame/Settings.h"
#include "core/html/HTMLFrameElementBase.h"
#include "core/workers/MainThreadWorkletGlobalScope.h"
#include "platform/weborigin/SecurityOrigin.h"

namespace blink {

static bool isOriginAccessibleFromDOMWindow(const SecurityOrigin* targetOrigin, const LocalDOMWindow* accessingWindow)
{
    return accessingWindow && accessingWindow->document()->getSecurityOrigin()->canAccessCheckSuborigins(targetOrigin);
}

static bool canAccessFrame(v8::Isolate* isolate, const LocalDOMWindow* accessingWindow, const SecurityOrigin* targetFrameOrigin, const DOMWindow* targetWindow, ExceptionState& exceptionState)
{
    ASSERT_WITH_SECURITY_IMPLICATION(!(targetWindow && targetWindow->frame()) || targetWindow == targetWindow->frame()->domWindow());

    // It's important to check that targetWindow is a LocalDOMWindow: it's
    // possible for a remote frame and local frame to have the same security
    // origin, depending on the model being used to allocate Frames between
    // processes. See https://crbug.com/601629.
    if (targetWindow && targetWindow->isLocalDOMWindow() && isOriginAccessibleFromDOMWindow(targetFrameOrigin, accessingWindow))
        return true;

    if (targetWindow)
        exceptionState.throwSecurityError(targetWindow->sanitizedCrossDomainAccessErrorMessage(accessingWindow), targetWindow->crossDomainAccessErrorMessage(accessingWindow));
    return false;
}

static bool canAccessFrame(v8::Isolate* isolate, const LocalDOMWindow* accessingWindow, SecurityOrigin* targetFrameOrigin, const DOMWindow* targetWindow, SecurityReportingOption reportingOption = ReportSecurityError)
{
    ASSERT_WITH_SECURITY_IMPLICATION(!(targetWindow && targetWindow->frame()) || targetWindow == targetWindow->frame()->domWindow());

    // It's important to check that targetWindow is a LocalDOMWindow: it's
    // possible for a remote frame and local frame to have the same security
    // origin, depending on the model being used to allocate Frames between
    // processes. See https://crbug.com/601629.
    if (targetWindow->isLocalDOMWindow() && isOriginAccessibleFromDOMWindow(targetFrameOrigin, accessingWindow))
        return true;

    if (reportingOption == ReportSecurityError && targetWindow)
        accessingWindow->printErrorMessage(targetWindow->crossDomainAccessErrorMessage(accessingWindow));
    return false;
}

bool BindingSecurity::shouldAllowAccessTo(v8::Isolate* isolate, const LocalDOMWindow* accessingWindow, const DOMWindow* target, ExceptionState& exceptionState)
{
    ASSERT(target);
    const Frame* frame = target->frame();
    if (!frame || !frame->securityContext())
        return false;
    return canAccessFrame(isolate, accessingWindow, frame->securityContext()->getSecurityOrigin(), target, exceptionState);
}

bool BindingSecurity::shouldAllowAccessTo(v8::Isolate* isolate, const LocalDOMWindow* accessingWindow, const DOMWindow* target, SecurityReportingOption reportingOption)
{
    ASSERT(target);
    const Frame* frame = target->frame();
    if (!frame || !frame->securityContext())
        return false;
    return canAccessFrame(isolate, accessingWindow, frame->securityContext()->getSecurityOrigin(), target, reportingOption);
}

bool BindingSecurity::shouldAllowAccessTo(v8::Isolate* isolate, const LocalDOMWindow* accessingWindow, const EventTarget* target, ExceptionState& exceptionState)
{
    ASSERT(target);
    const DOMWindow* window = target->toDOMWindow();
    if (!window) {
        // We only need to check the access to Window objects which are
        // cross-origin accessible.  If it's not a Window, the object's
        // origin must always be the same origin (or it already leaked).
        return true;
    }
    const Frame* frame = window->frame();
    if (!frame || !frame->securityContext())
        return false;
    return canAccessFrame(isolate, accessingWindow, frame->securityContext()->getSecurityOrigin(), window, exceptionState);
}

bool BindingSecurity::shouldAllowAccessTo(v8::Isolate* isolate, const LocalDOMWindow* accessingWindow, const Location* target, ExceptionState& exceptionState)
{
    ASSERT(target);
    const Frame* frame = target->frame();
    if (!frame || !frame->securityContext())
        return false;
    return canAccessFrame(isolate, accessingWindow, frame->securityContext()->getSecurityOrigin(), frame->domWindow(), exceptionState);
}

bool BindingSecurity::shouldAllowAccessTo(v8::Isolate* isolate, const LocalDOMWindow* accessingWindow, const Location* target, SecurityReportingOption reportingOption)
{
    ASSERT(target);
    const Frame* frame = target->frame();
    if (!frame || !frame->securityContext())
        return false;
    return canAccessFrame(isolate, accessingWindow, frame->securityContext()->getSecurityOrigin(), frame->domWindow(), reportingOption);
}

bool BindingSecurity::shouldAllowAccessTo(v8::Isolate* isolate, v8::Local<v8::Context> context, const ExecutionContext* executionContext, const MainThreadWorkletGlobalScope* workletGlobalScope, SecurityReportingOption reportingOption)
{
    DCHECK(executionContext);
    DOMWindow* domWindow = toDOMWindow(context);
    if (executionContext->isMainThreadWorkletGlobalScope()) {
        Frame* callingFrame = toMainThreadWorkletGlobalScope(executionContext)->frame();
        domWindow = callingFrame ? callingFrame->domWindow() : nullptr;
    }

    DCHECK(workletGlobalScope);
    const Frame* workletGlobalScopeFrame = workletGlobalScope->frame();
    if (!workletGlobalScopeFrame || !workletGlobalScopeFrame->securityContext())
        return false;

    return domWindow && canAccessFrame(isolate, toLocalDOMWindow(domWindow), workletGlobalScopeFrame->securityContext()->getSecurityOrigin(), workletGlobalScopeFrame->domWindow(), reportingOption);
}

bool BindingSecurity::shouldAllowAccessTo(v8::Isolate* isolate, v8::Local<v8::Context> calling, v8::Local<v8::Context> target, SecurityReportingOption reportingOption)
{
    ExecutionContext* targetExecutionContext = toExecutionContext(target);
    DCHECK(targetExecutionContext);

    ExecutionContext* callingExecutionContext = toExecutionContext(calling);
    DCHECK(callingExecutionContext);

    if (targetExecutionContext->isMainThreadWorkletGlobalScope())
        return shouldAllowAccessTo(isolate, calling, callingExecutionContext, toMainThreadWorkletGlobalScope(targetExecutionContext), DoNotReportSecurityError);

    if (callingExecutionContext->isMainThreadWorkletGlobalScope())
        return shouldAllowAccessTo(isolate, target, targetExecutionContext, toMainThreadWorkletGlobalScope(callingExecutionContext), DoNotReportSecurityError);

    DOMWindow* window = toDOMWindow(target);
    return window && shouldAllowAccessTo(isolate, toLocalDOMWindow(toDOMWindow(calling)), window, DoNotReportSecurityError);
}

bool BindingSecurity::shouldAllowAccessTo(v8::Isolate* isolate, const LocalDOMWindow* accessingWindow, const Node* target, ExceptionState& exceptionState)
{
    if (!target)
        return false;
    return canAccessFrame(isolate, accessingWindow, target->document().getSecurityOrigin(), target->document().domWindow(), exceptionState);
}

bool BindingSecurity::shouldAllowAccessTo(v8::Isolate* isolate, const LocalDOMWindow* accessingWindow, const Node* target, SecurityReportingOption reportingOption)
{
    if (!target)
        return false;
    return canAccessFrame(isolate, accessingWindow, target->document().getSecurityOrigin(), target->document().domWindow(), reportingOption);
}

bool BindingSecurity::shouldAllowAccessToFrame(v8::Isolate* isolate, const LocalDOMWindow* accessingWindow, const Frame* target, SecurityReportingOption reportingOption)
{
    if (!target || !target->securityContext())
        return false;
    return canAccessFrame(isolate, accessingWindow, target->securityContext()->getSecurityOrigin(), target->domWindow(), reportingOption);
}

} // namespace blink