XPCServiceEntryPoint.mm   [plain text]

/*
 * Copyright (C) 2013-2020 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. 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 DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS 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
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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 */

#import "config.h"

#import "ArgumentCodersCF.h"
#import "SandboxUtilities.h"
#import "XPCServiceEntryPoint.h"
#import <WebCore/ProcessIdentifier.h>
#import <wtf/cocoa/Entitlements.h>
#import <wtf/spi/darwin/SandboxSPI.h>

namespace WebKit {
using namespace WebCore;

XPCServiceInitializerDelegate::~XPCServiceInitializerDelegate()
{
}

bool XPCServiceInitializerDelegate::checkEntitlements()
{
#if PLATFORM(MAC) || PLATFORM(MACCATALYST)
    if (isClientSandboxed()) {
        // FIXME(<rdar://problem/54178641>): Remove this check once WebKit can work without network access.
        if (hasEntitlement("com.apple.security.network.client"))
            return true;

        audit_token_t auditToken = { };
        xpc_connection_get_audit_token(m_connection.get(), &auditToken);
        if (auto rc = sandbox_check_by_audit_token(auditToken, "mach-lookup", static_cast<enum sandbox_filter_type>(SANDBOX_FILTER_GLOBAL_NAME | SANDBOX_CHECK_NO_REPORT), "com.apple.nsurlsessiond")) {
            // FIXME (rdar://problem/54178641): This requirement is too strict, it should be possible to load file:// resources without network access.
            NSLog(@"Application does not have permission to communicate with network resources. rc=%d : errno=%d", rc, errno);
            return false;
        }
    }
#endif
    return true;
}

bool XPCServiceInitializerDelegate::getConnectionIdentifier(IPC::Connection::Identifier& identifier)
{
    mach_port_t port = xpc_dictionary_copy_mach_send(m_initializerMessage, "server-port");
    if (port == MACH_PORT_NULL)
        return false;

    identifier = IPC::Connection::Identifier(port, m_connection);
    return true;
}

bool XPCServiceInitializerDelegate::getClientIdentifier(String& clientIdentifier)
{
    clientIdentifier = xpc_dictionary_get_string(m_initializerMessage, "client-identifier");
    if (clientIdentifier.isEmpty())
        return false;
    return true;
}

bool XPCServiceInitializerDelegate::getProcessIdentifier(ProcessIdentifier& identifier)
{
    String processIdentifierString = xpc_dictionary_get_string(m_initializerMessage, "process-identifier");
    if (processIdentifierString.isEmpty())
        return false;

    bool ok;
    auto parsedIdentifier = processIdentifierString.toUInt64Strict(&ok);
    if (!ok)
        return false;

    identifier = makeObjectIdentifier<ProcessIdentifierType>(parsedIdentifier);
    return true;
}

bool XPCServiceInitializerDelegate::getClientProcessName(String& clientProcessName)
{
    clientProcessName = xpc_dictionary_get_string(m_initializerMessage, "ui-process-name");
    if (clientProcessName.isEmpty())
        return false;
    return true;
}

bool XPCServiceInitializerDelegate::getExtraInitializationData(HashMap<String, String>& extraInitializationData)
{
    xpc_object_t extraDataInitializationDataObject = xpc_dictionary_get_value(m_initializerMessage, "extra-initialization-data");

    String inspectorProcess = xpc_dictionary_get_string(extraDataInitializationDataObject, "inspector-process");
    if (!inspectorProcess.isEmpty())
        extraInitializationData.add("inspector-process"_s, inspectorProcess);

#if ENABLE(SERVICE_WORKER)
    String serviceWorkerProcess = xpc_dictionary_get_string(extraDataInitializationDataObject, "service-worker-process");
    if (!serviceWorkerProcess.isEmpty())
        extraInitializationData.add("service-worker-process"_s, WTFMove(serviceWorkerProcess));
    String registrableDomain = xpc_dictionary_get_string(extraDataInitializationDataObject, "registrable-domain");
    if (!registrableDomain.isEmpty())
        extraInitializationData.add("registrable-domain"_s, WTFMove(registrableDomain));
#endif

    String isPrewarmedProcess = xpc_dictionary_get_string(extraDataInitializationDataObject, "is-prewarmed");
    if (!isPrewarmedProcess.isEmpty())
        extraInitializationData.add("is-prewarmed"_s, isPrewarmedProcess);

    if (!isClientSandboxed()) {
        String userDirectorySuffix = xpc_dictionary_get_string(extraDataInitializationDataObject, "user-directory-suffix");
        if (!userDirectorySuffix.isEmpty())
            extraInitializationData.add("user-directory-suffix"_s, userDirectorySuffix);
    }

    String alwaysRunsAtBackgroundPriority = xpc_dictionary_get_string(extraDataInitializationDataObject, "always-runs-at-background-priority");
    if (!alwaysRunsAtBackgroundPriority.isEmpty())
        extraInitializationData.add("always-runs-at-background-priority"_s, alwaysRunsAtBackgroundPriority);

    return true;
}

bool XPCServiceInitializerDelegate::hasEntitlement(const char* entitlement)
{
    return WTF::hasEntitlement(m_connection.get(), entitlement);
}

bool XPCServiceInitializerDelegate::isClientSandboxed()
{
    return connectedProcessIsSandboxed(m_connection.get());
}

void XPCServiceExit(OSObjectPtr<xpc_object_t>&& priorityBoostMessage)
{
    // Make sure to destroy the priority boost message to avoid leaking a transaction.
    priorityBoostMessage = nullptr;

    // Balances the xpc_transaction_begin() in XPCServiceInitializer.
#if PLATFORM(MAC)
ALLOW_DEPRECATED_DECLARATIONS_BEGIN
    xpc_transaction_end();
ALLOW_DEPRECATED_DECLARATIONS_END
#endif

    xpc_transaction_exit_clean();
}

} // namespace WebKit