1; Copyright (C) 2014 Apple Inc. All rights reserved.
2;
3; Redistribution and use in source and binary forms, with or without
4; modification, are permitted provided that the following conditions
5; are met:
6; 1. Redistributions of source code must retain the above copyright
7;    notice, this list of conditions and the following disclaimer.
8; 2. Redistributions in binary form must reproduce the above copyright
9;    notice, this list of conditions and the following disclaimer in the
10;    documentation and/or other materials provided with the distribution.
11;
12; THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
13; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
14; THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
15; PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
16; BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
17; CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
18; SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
19; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
20; CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
21; ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
22; THE POSSIBILITY OF SUCH DAMAGE.
23
24(version 1)
25(deny default (with partial-symbolication))
26(allow system-audit file-read-metadata)
27
28(import "system.sb")
29
30;; Utility functions for home directory relative path filters
31(define (home-regex home-relative-regex)
32  (regex (string-append "^" (regex-quote (param "HOME_DIR")) home-relative-regex)))
33
34(define (home-subpath home-relative-subpath)
35    (subpath (string-append (param "HOME_DIR") home-relative-subpath)))
36
37(define (home-literal home-relative-literal)
38    (literal (string-append (param "HOME_DIR") home-relative-literal)))
39
40;; Read-only preferences and data
41(allow file-read*
42    ;; Basic system paths
43    (subpath "/Library/Frameworks")
44    (subpath "/Library/Managed Preferences")
45
46    ;; System and user preferences
47    (literal "/Library/Preferences/.GlobalPreferences.plist")
48    (home-literal "/Library/Preferences/.GlobalPreferences.plist")
49    (home-regex #"/Library/Preferences/ByHost/\.GlobalPreferences\.")
50
51    ;; On-disk WebKit2 framework location, to account for debug installations
52    ;; outside of /System/Library/Frameworks
53    (subpath (param "WEBKIT2_FRAMEWORK_DIR")))
54
55;; Sandbox extensions
56(define (apply-read-and-issue-extension op path-filter)
57    (op file-read* path-filter)
58    (op file-issue-extension (require-all (extension-class "com.apple.app-sandbox.read") path-filter)))
59(define (apply-write-and-issue-extension op path-filter)
60    (op file-write* path-filter)
61    (op file-issue-extension (require-all (extension-class "com.apple.app-sandbox.read-write") path-filter)))
62(define (read-only-and-issue-extensions path-filter)
63    (apply-read-and-issue-extension allow path-filter))
64(define (read-write-and-issue-extensions path-filter)
65    (apply-read-and-issue-extension allow path-filter)
66    (apply-write-and-issue-extension allow path-filter))
67(read-only-and-issue-extensions (extension "com.apple.app-sandbox.read"))
68(read-write-and-issue-extensions (extension "com.apple.app-sandbox.read-write"))
69
70(if (defined? 'vnode-type)
71    (deny file-write-create (vnode-type SYMLINK)))
72
73;; FIXME: Should be removed once <rdar://problem/16329087> is fixed.
74(deny file-write-xattr (xattr "com.apple.quarantine") (with no-log))
75
76;; Reserve a namespace for additional protected extended attributes.
77#if __MAC_OS_X_VERSION_MIN_REQUIRED > 1090
78(deny file-read-xattr file-write-xattr (xattr-regex #"^com\.apple\.security\.private\."))
79#else
80(deny file-read-xattr file-write-xattr (xattr #"^com\.apple\.security\.private\."))
81#endif
82