/*
* Copyright (C) 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
* 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.
*/
#import "config.h"
#import "XPCEndpoint.h"
#import <wtf/cocoa/Entitlements.h>
#if PLATFORM(MAC)
#import "CodeSigning.h"
#import <Kernel/kern/cs_blobs.h>
#import <wtf/RetainPtr.h>
#import <wtf/spi/cocoa/SecuritySPI.h>
#import <wtf/text/WTFString.h>
#endif
namespace WebKit {
XPCEndpoint::XPCEndpoint()
{
m_connection = adoptOSObject(xpc_connection_create(nullptr, nullptr));
m_endpoint = adoptOSObject(xpc_endpoint_create(m_connection.get()));
xpc_connection_set_target_queue(m_connection.get(), dispatch_get_main_queue());
xpc_connection_set_event_handler(m_connection.get(), ^(xpc_object_t message) {
xpc_type_t type = xpc_get_type(message);
if (type == XPC_TYPE_CONNECTION) {
OSObjectPtr<xpc_connection_t> connection = message;
#if USE(APPLE_INTERNAL_SDK)
auto pid = xpc_connection_get_pid(connection.get());
if (pid != getpid() && !WTF::hasEntitlement(connection.get(), "com.apple.private.webkit.use-xpc-endpoint")) {
WTFLogAlways("Audit token does not have required entitlement com.apple.private.webkit.use-xpc-endpoint");
#if PLATFORM(MAC)
audit_token_t auditToken;
xpc_connection_get_audit_token(connection.get(), &auditToken);
bool isPlatformBinary = SecTaskGetCodeSignStatus(adoptCF(SecTaskCreateWithAuditToken(kCFAllocatorDefault, auditToken)).get()) & CS_PLATFORM_BINARY;
auto signingIdentifier = codeSigningIdentifier(connection.get());
if (!isPlatformBinary || !signingIdentifier.startsWith("com.apple.WebKit.WebContent")) {
WTFLogAlways("XPC endpoint denied to connect with unknown client");
return;
}
#else
return;
#endif
}
#endif // USE(APPLE_INTERNAL_SDK)
xpc_connection_set_target_queue(connection.get(), dispatch_get_main_queue());
xpc_connection_set_event_handler(connection.get(), ^(xpc_object_t event) {
handleEvent(connection.get(), event);
});
xpc_connection_resume(connection.get());
}
});
xpc_connection_resume(m_connection.get());
}
void XPCEndpoint::sendEndpointToConnection(xpc_connection_t connection)
{
if (!connection)
return;
auto message = adoptOSObject(xpc_dictionary_create(nullptr, nullptr, 0));
xpc_dictionary_set_string(message.get(), xpcEndpointMessageNameKey(), xpcEndpointMessageName());
xpc_dictionary_set_value(message.get(), xpcEndpointNameKey(), m_endpoint.get());
xpc_connection_send_message(connection, message.get());
}
OSObjectPtr<xpc_endpoint_t> XPCEndpoint::endpoint() const
{
return m_endpoint;
}
}