SecTranslocateXPCServer.cpp   [plain text]

/*
 * Copyright (c) 2016 Apple Inc. All Rights Reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
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 * @APPLE_LICENSE_HEADER_END@
 */

#include <string>
#include <vector>

#include <dispatch/dispatch.h>
#include <xpc/xpc.h>

#include <security_utilities/unix++.h>
#include <security_utilities/logging.h>

#include "SecTranslocateInterface.hpp"
#include "SecTranslocateXPCServer.hpp"
#include "SecTranslocateUtilities.hpp"
#include "SecTranslocateShared.hpp"

namespace Security {
namespace SecTranslocate {

static void doCreate(xpc_object_t msg, xpc_object_t reply)
{
    const char* original = xpc_dictionary_get_string(msg, kSecTranslocateXPCMessageOriginalPath);
    const char* dest = xpc_dictionary_get_string(msg, kSecTranslocateXPCMessageDestinationPath);

    string originalPath = original ? original : "";
    string destPath = dest ? dest: "";

    if( originalPath.empty())
    {
        Syslog::error("SecTranslocate: XPCServer, doCreate no path to translocate");
        UnixError::throwMe(EINVAL);
    }

    TranslocationPath tPath(originalPath);

    string result = tPath.getOriginalRealPath();

    if(tPath.shouldTranslocate())
    {
        result = Security::SecTranslocate::translocatePathForUser(tPath, destPath);
    }
    xpc_dictionary_set_string(reply, kSecTranslocateXPCReplySecurePath, result.c_str());
}

static void doCheckIn(xpc_object_t msg)
{
    if (xpc_dictionary_get_value(msg, kSecTranslocateXPCMessagePid) == NULL)
    {
        Syslog::error("SecTranslocate, XpcServer, doCheckin, no pid provided");
        UnixError::throwMe(EINVAL);
    }
    int64_t pid = xpc_dictionary_get_int64(msg, kSecTranslocateXPCMessagePid);
    Translocator * t = getTranslocator();
    if(t)
    {
        t->appLaunchCheckin((pid_t)pid);
    }
    else
    {
        Syslog::critical("SecTranslocate, XpcServer, doCheckin, No top level translocator");
        UnixError::throwMe(EINVAL);
    }
}

XPCServer::XPCServer(dispatch_queue_t q):notificationQ(q)
{
    if(q == NULL)
    {
        Syslog::critical("SecTranslocate: XPCServer, no dispatch queue provided");
        UnixError::throwMe(EINVAL);
    }
    //notificationQ is assumed to be serial
    service = xpc_connection_create_mach_service(SECTRANSLOCATE_XPC_SERVICE_NAME,
                                                 notificationQ,
                                                 XPC_CONNECTION_MACH_SERVICE_LISTENER);
    if (service == NULL)
    {
        Syslog::critical("SecTranslocate: XPCServer, failed to create xpc mach service");
        UnixError::throwMe(ENOMEM);
    }

    dispatch_retain(notificationQ);
    xpc_connection_set_event_handler(service, ^(xpc_object_t cmsg) {
        if (xpc_get_type(cmsg) == XPC_TYPE_CONNECTION) {
            xpc_connection_t connection = xpc_connection_t(cmsg);
            Syslog::debug("SecTranslocate: XPCServer, Connection from pid %d", xpc_connection_get_pid(connection));
            xpc_connection_set_event_handler(connection, ^(xpc_object_t msg) {
                if (xpc_get_type(msg) == XPC_TYPE_DICTIONARY) {
                    xpc_retain(msg);
                    dispatch_async(notificationQ, ^{	// async from here
                        const char *function = xpc_dictionary_get_string(msg, kSecTranslocateXPCMessageFunction);
                        Syslog::debug("SecTranslocate: XPCServer, pid %d requested %s", xpc_connection_get_pid(connection), function);
                        xpc_object_t reply = xpc_dictionary_create_reply(msg);
                        try {
                            if (function == NULL) {
                                xpc_dictionary_set_int64(reply, kSecTranslocateXPCReplyError, EINVAL);
                            } else if (!strcmp(function, kSecTranslocateXPCFuncCreate)) {
                                doCreate(msg, reply);
                            } else if (!strcmp(function, kSecTranslocateXPCFuncCheckIn)) {
                                doCheckIn(msg);
                            } else {
                                xpc_dictionary_set_int64(reply, kSecTranslocateXPCReplyError, EINVAL);
                            }
                        } catch (Security::UnixError err) {
                            xpc_dictionary_set_int64(reply, kSecTranslocateXPCReplyError, err.unixError());
                        } catch (...) {
                            xpc_dictionary_set_int64(reply, kSecTranslocateXPCReplyError, EINVAL);
                        }
                        xpc_release(msg);
                        if (reply) {
                            xpc_connection_send_message(connection, reply);
                            xpc_release(reply);
                        }
                    });
                }
            });
            xpc_connection_resume(connection);
        } else {
            const char *s = xpc_copy_description(cmsg);
            Syslog::error("SecTranslocate: XPCServer, unepxected incoming message - %s", s);
            free((char*)s);
        }
    });
    xpc_connection_resume(service);
}

XPCServer::~XPCServer()
{
    xpc_connection_cancel(service);
    dispatch_release(notificationQ);
}

} //namespace Security
} //namespace SecTranslocate