/*

 *  EthernetSocketTool.c

 *  BSDLLCTest

 *

    Copyright:  Copyright (c) 1998-2003 by Apple Computer, Inc., All Rights Reserved.

    Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.

 ("Apple") in consideration of your agreement to the following terms, and your

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 constitutes acceptance of these terms.  If you do not agree with these terms,

 please do not use, install, modify or redistribute this Apple software.

 In consideration of your agreement to abide by the following terms, and subject

 to these terms, Apple grants you a personal, non-exclusive license, under AppleÕs

 copyrights in this original Apple software (the "Apple Software"), to use,

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 modifications, in source and/or binary forms; provided that if you redistribute

 the Apple Software in its entirety and without modifications, you must retain

 this notice and the following text and disclaimers in all such redistributions of

 the Apple Software.  Neither the name, trademarks, service marks or logos of

 Apple Computer, Inc. may be used to endorse or promote products derived from the

 Apple Software without specific prior written permission from Apple.  Except as

 expressly stated in this notice, no other rights or licenses, express or implied,

 are granted by Apple herein, including but not limited to any patent rights that

 may be infringed by your derivative works or by other works in which the Apple

 Software may be incorporated.

 The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO

 WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED

 WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN

 COMBINATION WITH YOUR PRODUCTS.

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 *

 */

#include "BSDLLCTestCommon.h"

#include "MoreUNIX.h"

#include "MoreSecurity.h"

#include "MoreCFQ.h"

#include "EthernetSocketStuff.h"

#include <Carbon/Carbon.h>

#include <unistd.h>

#include <sys/stat.h>

#include <sys/wait.h>

#include <sys/types.h>

#include <sys/fcntl.h>

#include <sys/errno.h>

#include <sys/ipc.h>

#include <sys/uio.h>

#include <sys/un.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <mach-o/dyld.h>

static OSStatus OpenPFNDRVSocketCommand(CFDictionaryRef *result);

/*

    OpenPFNDRVSocketCommand takes the CFDictionaryRef argument passed to the 

    tool by the application and opens the PFNDRV socket.

*/

static OSStatus OpenPFNDRVSocketCommand(CFDictionaryRef *result)

{

    OSStatus            err;

    CFMutableArrayRef   descArray;

    CFNumberRef         descNum;

    int                 fd;

    assert( result != NULL);

    assert(*result == NULL);

    descArray = NULL;

    // create the mutable array which shall be used to return the opened

    // socket 

    err = CFQArrayCreateMutable(&descArray);

    if (err == noErr)

    {

        // make sure we are in privileged mode

        MoreSecSetPrivilegedEUID();

#if MORE_DEBUG

        fprintf(stderr, "About to open the raw socket\n");

#endif

        // open a PF_NDRV socket - requires privedged access

        fd = socket(AF_NDRV, SOCK_RAW, 0);

        // done making priviledged call

        // disable privileged mode

        MoreSecTemporarilySetNonPrivilegedEUID();

        err = EXXXToOSStatus( MoreUNIXErrno(fd) );

        if (err == noErr)

        {

#if MORE_DEBUG

            fprintf(stderr, "raw socket opened  %d\n", fd);

#endif

            descNum = CFNumberCreate(NULL, kCFNumberIntType, &fd);

            if (descNum == NULL) 

            {

                err = coreFoundationUnknownErr;

            }

        }

        if (err == noErr) 

        {

            CFArrayAppendValue(descArray, descNum);

        }

        // Clean up

        CFQRelease(descNum);    

    }

    if (err == noErr)

    {

        CFStringRef key;

        // since we are passing back a file descriptor, we must set the key to the

        // magic flag kMoreSecFileDescriptorsKey, which MoreAuth will special case

        // when returning the file descriptor to the application.

        key = kMoreSecFileDescriptorsKey;

        *result = CFDictionaryCreate(NULL, (const void **) &key, (const void **) &descArray, 1, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);

        err = CFQError(*result);

    }

    if (err != noErr)

    {

        MoreSecCloseDescriptorArray(descArray);

    }

    CFQRelease(descArray);

    assert( (err == noErr) == (*result != NULL) );

#if MORE_DEBUG

    fprintf(stderr, "tool returning error  %d\n", err);

#endif

    return err;

}

static OSStatus GetPFNDRVSocketToolCommandProc(AuthorizationRef auth, CFDictionaryRef request, CFDictionaryRef *result)

// Our command callback for MoreSecHelperToolMain.  Extracts

// the command name from the request dictionary and calls

// through to the appropriate command handler (in this case

// there's only one).

{

    OSStatus            err;

    CFStringRef         command;

    int                 fd = 0;

    assert(auth != NULL);

    assert(request != NULL);

    assert( result != NULL);

    assert(*result == NULL);

    assert(geteuid() == getuid());

    err = kMyAuthorizedCommandSuccess;

    command = (CFStringRef) CFDictionaryGetValue(request, kBSDLLCTestCommandNameKey);

    if ((command == NULL) || (CFGetTypeID(command) != CFStringGetTypeID()))

    {

        err = kMyAuthorizedCommandInternalError;

    }

    if (err == kMyAuthorizedCommandSuccess)

    {

        if (CFEqual(command, kBSDLLCTestGetPFNDRVSocket))

        {

            static const char *kRightName = "com.apple.dts.BSDLLCTest.GetPFNDRVSocketTool";

            static const AuthorizationFlags kAuthFlags = kAuthorizationFlagDefaults

                | kAuthorizationFlagInteractionAllowed

                | kAuthorizationFlagExtendRights

                ;

            AuthorizationItem   right  = { kRightName, 0, NULL, 0 };

            AuthorizationRights rights = { 1, &right };

                        // Before doing our privileged work, acquire an authorization right.

               // This allows the system administrator to configure the system

               // (via "/etc/authorization") for the security level that they want.

               //

               // Unfortunately, the default rule in "/etc/authorization" always

               // triggers a password dialog.  Right now, there's no way around

               // this [2939908].  One commonly accepted workaround is to not

               // acquire a authorization right (ie don't call AuthorizationCopyRights

               // here) but instead limit your tool in some other way.  For example,

               // an Internet setup assistant helper tool might only allow the user

               // to modify network locations that they created.

            err = AuthorizationCopyRights(auth, &rights, kAuthorizationEmptyEnvironment, kAuthFlags, NULL);

#if MORE_DEBUG

            fprintf(stderr, "BSDLLCTest: GetPFNDRVSocketTool: ACR returned %ld\n", err);

#endif

            if (err == kMyAuthorizedCommandSuccess)

            {

                err = OpenPFNDRVSocketCommand(result);

            }

        }

    }

    return err;

}

int main(int argc, const char *argv[])

{

    int                 err;

    int                 result;

    AuthorizationRef    auth;

    // It's vital that we get any auth ref passed to us from

    // AuthorizationExecuteWithPrivileges before we call

    // MoreSecDestroyInheritedEnvironment, because AEWP passes its

    // auth ref to us via the environment.

    //

    // auth may come back as NULL, and that's just fine.  It signals

    // that we're not being executed by AuthorizationExecuteWithPrivileges.

    auth = MoreSecHelperToolCopyAuthRef();

    // Because we're normally running as a setuid root program, it's

    // important that we not trust any information coming to us from

    // our potentially malicious parent process.

    // MoreSecDestroyInheritedEnvironment eliminates all sources of

    // such information, so we can't depend on it ever if we try.

    err = MoreSecDestroyInheritedEnvironment(kMoreSecKeepStandardFilesMask, argv);

    // Mask SIGPIPE, otherwise stuff won't work properly.

    if (err == 0)

    {

        err = MoreUNIXIgnoreSIGPIPE();

    }

    // Call the MoreSecurity helper routine.

    if (err == 0)

    {

        err = MoreSecHelperToolMain(STDIN_FILENO, STDOUT_FILENO, auth, GetPFNDRVSocketToolCommandProc, argc, argv);

    }

    // Map the error code to a tool result.

    result = MoreSecErrorToHelperToolResult(err);

#if MORE_DEBUG

    fprintf(stderr, "  err    = %d\n", err);

    fprintf(stderr, "  result = %d\n", result);

#endif

    return result;

}