1/*
2 * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. Please obtain a copy of the License at
10 * http://www.opensource.apple.com/apsl/ and read it before using this
11 * file.
12 *
13 * The Original Code and all software distributed under the License are
14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
18 * Please see the License for the specific language governing rights and
19 * limitations under the License.
20 *
21 * @APPLE_LICENSE_HEADER_END@
22 */
23
24
25//
26// trampolineServer.cpp - tool-side trampoline support functions
27//
28#include <cstdlib>
29#include <unistd.h>
30#include <Security/Authorization.h>
31#include <Security/SecBase.h>
32
33//
34// In a tool launched via AuthorizationCopyPrivilegedReference, retrieve a copy
35// of the AuthorizationRef that started it all.
36//
37OSStatus AuthorizationCopyPrivilegedReference(AuthorizationRef *authorization,
38	AuthorizationFlags flags)
39{
40	// flags are currently reserved
41	if (flags != 0)
42		return errAuthorizationInvalidFlags;
43
44	// retrieve hex form of external form from environment
45	const char *mboxFdText = getenv("__AUTHORIZATION");
46	if (!mboxFdText)
47		return errAuthorizationInvalidRef;
48
49    // retrieve mailbox file and read external form
50    AuthorizationExternalForm extForm;
51    int fd;
52    if (sscanf(mboxFdText, "auth %d", &fd) != 1)
53        return errAuthorizationInvalidRef;
54    if (lseek(fd, 0, SEEK_SET) ||
55            read(fd, &extForm, sizeof(extForm)) != sizeof(extForm)) {
56        close(fd);
57        return errAuthorizationInvalidRef;
58    }
59
60	// internalize the authorization
61	AuthorizationRef auth;
62	if (OSStatus error = AuthorizationCreateFromExternalForm(&extForm, &auth))
63		return error;
64
65	// well, here you go
66	*authorization = auth;
67	return errSecSuccess;
68}
69