mDNSResponder.sb   [plain text]


; -*- Mode: Scheme; tab-width: 4 -*-
;
; Copyright (c) 2012 Apple Inc. All rights reserved.
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;     this list of conditions and the following disclaimer. 
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;     this list of conditions and the following disclaimer in the documentation 
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;     software without specific prior written permission. 
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; DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 
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;############################################################################


; WARNING: The sandbox rule capabilities and syntax used in this file are currently an
; Apple SPI (System Private Interface) and are subject to change at any time without notice.

(version 1)
; When mDNSResponder is denied access, we want to avoid symoblification of mDNSResponder
; to get the stack trace as that can get into deadlock. no-callout will prevent
; symbolification.
(deny default (with no-callout))

(import "system.sb")

; Baseline
(allow file-read-metadata ipc-posix-shm)

; Mach communications
; These are needed for things like getpwnam, hostname changes, & keychain
(allow mach-lookup
       (global-name "com.apple.bsd.dirhelper")
       (global-name "com.apple.distributed_notifications.2")
       (global-name "com.apple.ocspd")
       (global-name "com.apple.PowerManagement.control")
       (global-name "com.apple.mDNSResponderHelper")
       (global-name "com.apple.SecurityServer")
       (global-name "com.apple.SystemConfiguration.configd")
       (global-name "com.apple.SystemConfiguration.SCNetworkReachability")
       (global-name "com.apple.system.notification_center")
       (global-name "com.apple.system.logger")
       (global-name "com.apple.webcontentfilter.dns")
       (global-name "com.apple.server.bluetooth")
       (global-name "com.apple.awacs")
       (global-name "com.apple.networkd")
       (global-name "com.apple.securityd")
       (global-name "com.apple.wifi.manager")
       (global-name "com.apple.blued"))

; Networking, including Unix Domain Sockets
(allow network*)

; Raw sockets
(if (defined? 'system-socket)
    (allow system-socket))

; Hardware model information
(allow sysctl-read)

; Syslog early in the boot process
(allow file-read-data file-write-data (literal "/dev/console"))

(allow file-read-data
       ; /etc/hosts support
       (literal "/private/etc/hosts")
       (literal "/private/etc"))

; Our socket
(allow file-read* file-write* (literal "/private/var/run/mDNSResponder"))

; System version, settings, and other miscellaneous necessary file system accesses
(allow file-read-data
       ; Needed for CFCopyVersionDictionary()
       (literal "/usr/sbin")
       (literal "/usr/sbin/mDNSResponder")

       (literal "/Library/Preferences/SystemConfiguration/preferences.plist")
       (literal "/Library/Preferences/SystemConfiguration/com.apple.nat.plist")
       (regex #"^/Library/Preferences/(ByHost/)?\.GlobalPreferences\.")
       (literal "/Library/Preferences/com.apple.crypto.plist")
       (literal "/Library/Security/Trust Settings/Admin.plist")
       (regex #"^/Library/Preferences/com\.apple\.security\.")
       (literal "/Library/Preferences/SystemConfiguration/com.apple.PowerManagement.plist")
       (literal "/private/var/preferences/SystemConfiguration/preferences.plist"))

; We just need access to System.keychain. But we don't want errors logged if other keychains are
; accessed under /Library/Keychains. Other keychains may be accessed as part of setting up an SSL
; connection. Instead of adding access to it here (to things which we don't need), we disable any
; logging that might happen during the access
(deny file-read-data (regex #"^/Library/Keychains/") (with no-log))
(allow file-read-data (literal "/Library/Keychains/System.keychain"))

; Our Module Directory Services cache
(allow file-read-data
       (subpath "/private/var/tmp/mds")
       (subpath "/private/var/db/mds"))

(allow file-read* file-write*
       (regex #"^/private/var/tmp/mds/[0-9]+(/|$)")
       (regex #"^/private/var/db/mds/[0-9]+(/|$)")
       (regex #"^/private/var/folders/[^/]+/[^/]+/C/mds(/|$)")

       ; Required on 10.5 and 10.6
       (regex #"^/private/var/folders/[^/]+/[^/]+/-Caches-/mds(/|$)"))

; CRL Cache for SSL/TLS connections
(allow file-read-data (literal "/private/var/db/crls/crlcache.db"))

; For mDNS sleep proxy offload and IOPMConnectionCreate
(if (defined? 'iokit-open)
   (begin
     (allow iokit-open
        (iokit-user-client-class "NVEthernetUserClientMDNS")
        (iokit-user-client-class "mDNSOffloadUserClient")
        (iokit-user-client-class "RootDomainUserClient"))))