Source/core/loader/MixedContentChecker.cpp

/*
 * Copyright (C) 2012 Google 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.
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 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
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 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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
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#include "config.h"
#include "core/loader/MixedContentChecker.h"

#include "core/dom/Document.h"
#include "core/frame/LocalFrame.h"
#include "core/frame/Settings.h"
#include "core/inspector/ConsoleMessage.h"
#include "core/loader/FrameLoader.h"
#include "core/loader/FrameLoaderClient.h"
#include "platform/RuntimeEnabledFeatures.h"
#include "platform/weborigin/SchemeRegistry.h"
#include "platform/weborigin/SecurityOrigin.h"
#include "wtf/text/StringBuilder.h"

namespace blink {

MixedContentChecker::MixedContentChecker(LocalFrame* frame)
    : m_frame(frame)
{
}

FrameLoaderClient* MixedContentChecker::client() const
{
    return m_frame->loader().client();
}

// static
bool MixedContentChecker::isMixedContent(SecurityOrigin* securityOrigin, const KURL& url)
{
    if (securityOrigin->protocol() != "https")
        return false; // We only care about HTTPS security origins.

    // We're in a secure context, so |url| is mixed content if it's insecure.
    return !SecurityOrigin::isSecure(url);
}

bool MixedContentChecker::canDisplayInsecureContentInternal(SecurityOrigin* securityOrigin, const KURL& url, const MixedContentType type) const
{
    // Check the top frame if it differs from MixedContentChecker's m_frame.
    if (!m_frame->tree().top()->isLocalFrame()) {
        // FIXME: We need a way to access the top-level frame's MixedContentChecker when that frame
        // is in a different process from the current frame. Until that is done, we always allow
        // loads in remote frames.
        return false;
    }
    Frame* top = m_frame->tree().top();
    if (top != m_frame && !toLocalFrame(top)->loader().mixedContentChecker()->canDisplayInsecureContent(toLocalFrame(top)->document()->securityOrigin(), url))
        return false;

    // Then check the current frame:
    if (!isMixedContent(securityOrigin, url))
        return true;

    Settings* settings = m_frame->settings();
    bool allowed = client()->allowDisplayingInsecureContent(settings && settings->allowDisplayOfInsecureContent(), securityOrigin, url);
    logWarning(allowed, url, type);

    if (allowed)
        client()->didDisplayInsecureContent();

    return allowed;
}

bool MixedContentChecker::canRunInsecureContentInternal(SecurityOrigin* securityOrigin, const KURL& url, const MixedContentType type) const
{
    // Check the top frame if it differs from MixedContentChecker's m_frame.
    if (!m_frame->tree().top()->isLocalFrame()) {
        // FIXME: We need a way to access the top-level frame's MixedContentChecker when that frame
        // is in a different process from the current frame. Until that is done, we always allow
        // loads in remote frames.
        return false;
    }
    Frame* top = m_frame->tree().top();
    if (top != m_frame && !toLocalFrame(top)->loader().mixedContentChecker()->canRunInsecureContent(toLocalFrame(top)->document()->securityOrigin(), url))
        return false;

    // Then check the current frame:
    if (!isMixedContent(securityOrigin, url))
        return true;

    Settings* settings = m_frame->settings();
    bool allowedPerSettings = settings && (settings->allowRunningOfInsecureContent() || ((type == WebSocket) && settings->allowConnectingInsecureWebSocket()));
    bool allowed = client()->allowRunningInsecureContent(allowedPerSettings, securityOrigin, url);
    logWarning(allowed, url, type);

    if (allowed)
        client()->didRunInsecureContent(securityOrigin, url);

    return allowed;
}

bool MixedContentChecker::canFrameInsecureContent(SecurityOrigin* securityOrigin, const KURL& url) const
{
    // If we're dealing with a CORS-enabled scheme, then block mixed frames as active content. Otherwise,
    // treat frames as passive content.
    //
    // FIXME: Remove this temporary hack once we have a reasonable API for launching external applications
    // via URLs. http://crbug.com/318788 and https://crbug.com/393481
    if (SchemeRegistry::shouldTreatURLSchemeAsCORSEnabled(url.protocol()))
        return canRunInsecureContentInternal(securityOrigin, url, MixedContentChecker::Execution);
    return canDisplayInsecureContentInternal(securityOrigin, url, MixedContentChecker::Display);
}

bool MixedContentChecker::canConnectInsecureWebSocket(SecurityOrigin* securityOrigin, const KURL& url) const
{
    if (RuntimeEnabledFeatures::laxMixedContentCheckingEnabled())
        return canDisplayInsecureContentInternal(securityOrigin, url, MixedContentChecker::WebSocket);
    return canRunInsecureContentInternal(securityOrigin, url, MixedContentChecker::WebSocket);
}

bool MixedContentChecker::canSubmitToInsecureForm(SecurityOrigin* securityOrigin, const KURL& url) const
{
    // For whatever reason, some folks handle forms via JavaScript, and submit to `javascript:void(0)`
    // rather than calling `preventDefault()`. We special-case `javascript:` URLs here, as they don't
    // introduce MixedContent for form submissions.
    if (url.protocolIs("javascript"))
        return true;

    // If lax mixed content checking is enabled (noooo!), skip this check entirely.
    if (RuntimeEnabledFeatures::laxMixedContentCheckingEnabled())
        return true;
    return canDisplayInsecureContentInternal(securityOrigin, url, MixedContentChecker::Submission);
}

void MixedContentChecker::logWarning(bool allowed, const KURL& target, const MixedContentType type) const
{
    StringBuilder message;
    message.append((allowed ? "" : "[blocked] "));
    message.append("The page at '" + m_frame->document()->url().elidedString() + "' was loaded over HTTPS, but ");
    switch (type) {
    case Display:
        message.append("displayed insecure content from '" + target.elidedString() + "': this content should also be loaded over HTTPS.\n");
        break;
    case Execution:
    case WebSocket:
        message.append("ran insecure content from '" + target.elidedString() + "': this content should also be loaded over HTTPS.\n");
        break;
    case Submission:
        message.append("is submitting data to an insecure location at '" + target.elidedString() + "': this content should also be submitted over HTTPS.\n");
        break;
    }
    MessageLevel messageLevel = allowed ? WarningMessageLevel : ErrorMessageLevel;
    m_frame->document()->addConsoleMessage(ConsoleMessage::create(SecurityMessageSource, messageLevel, message.toString()));
}

} // namespace blink