Sandbox/OS X Rule Set

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Revision as of 22:20, 4 May 2016 by Haftandilian (talk | contribs) (Updates)
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References
1

Apple's Sandbox Guide v1.0 13-09-2011
http://reverse.put.as/wp-content/uploads/2011/09/Apple-Sandbox-Guide-v1.0.pdf


Rule Description 
static const char contentSandboxRules[] =
(version 1)
 References[1] states only version 1 is supported. I tried with version=2 and sandbox_init failed due to "unsupported version". 
(define sandbox-level %d)
(define macosMinorVersion %d)
(define appPath \"%s\")
(define appBinaryPath \"%s\")
(define appDir \"%s\")
(define appTempDir \"%s\")
(define home-path \"%s\")

These setup some macros to be used later in the policy. See the next row for examples of what they evaulate to on a Nightly build.

Full paths abbreviated. 

(define sandbox-level 1)
(define macosMinorVersion 11)
(define appPath "/.../NightlyDebug.app/Contents/MacOS/plugin-container.app")
(define appBinaryPath "/.../NightlyDebug.app/Contents/MacOS/plugin-container.app/Contents/MacOS/plugin-container")
(define appDir "/.../NightlyDebug.app/Contents/Resources/browser")
(define appTempDir "/Users/<USERNAME>/Library/Caches/TemporaryItems/Temp-{62ac76fa-73fd-8f46-bd2b-12c4d53aa1cc}")
(define home-path "/Users/<USERNAME>")

(import \"/System/Library/Sandbox/Profiles/system.sb\")

This excerpt it what is enabled for us. The file also defines some macros, but they're not used in the file or by our rules. Namely "(define (system-network) ...)" and "(define (system-graphics) ...)". 

...
;;; Allow registration of per-pid services.
(allow mach-register
       (local-name-regex #""))

;;; Allow read access to standard system paths.
(allow file-read*
       (require-all (file-mode #o0004)
                    (require-any (subpath "/Library/Filesystems/NetFSPlugins")
                                 (subpath "/System")
                                 (subpath "/private/var/db/dyld")
                                 (subpath "/usr/lib")
                                 (subpath "/usr/share"))))

(allow file-read-metadata
       (literal "/etc")
       (literal "/tmp")
       (literal "/var")
       (literal "/private/etc/localtime"))

;;; Allow access to standard special files.
(allow file-read*
       (literal "/dev/autofs_nowait")
       (literal "/dev/random")
       (literal "/dev/urandom")
       (literal "/private/etc/master.passwd")
       (literal "/private/etc/passwd"))

(allow file-read*
       file-write-data
       (literal "/dev/null")
       (literal "/dev/zero"))

(allow file-read*
       file-write-data
       file-ioctl
       (literal "/dev/dtracehelper"))

(allow network-outbound
       (literal "/private/var/run/asl_input")
       (literal "/private/var/run/syslog"))

;;; Allow creation of core dumps.
(allow file-write-create
       (require-all (regex #"^/cores/")
                    (vnode-type REGULAR-FILE)))

;;; Allow IPC to standard system agents.
(allow ipc-posix-shm-read*
       (ipc-posix-name #"apple.shm.notification_center")
       (ipc-posix-name-regex #"^apple\.shm\.cfprefsd\."))

(allow mach-lookup
       (global-name "com.apple.appsleep")
       (global-name "com.apple.bsd.dirhelper")
       (global-name "com.apple.cfprefsd.agent")
       (global-name "com.apple.cfprefsd.daemon")
       (global-name "com.apple.diagnosticd")
       (global-name "com.apple.espd")
       (global-name "com.apple.secinitd")
       (global-name "com.apple.system.DirectoryService.libinfo_v1")
       (global-name "com.apple.system.logger")
       (global-name "com.apple.system.notification_center")
       (global-name "com.apple.system.opendirectoryd.libinfo")
       (global-name "com.apple.system.opendirectoryd.membership")
       (global-name "com.apple.trustd")
       (global-name "com.apple.trustd.agent")
       (global-name "com.apple.xpc.activity.unmanaged")
       (global-name "com.apple.xpcd")
       (local-name "com.apple.cfprefsd.agent"))

;;; Allow mostly harmless operations.
(allow sysctl-read)

This imports all the sandbox policy directives in the file /System/Library/Sandbox/Profiles/system.sb which ships with OS X. 

  "\n"
  "(if \n"
  "  (or\n"
  "    (< macosMinorVersion 9)\n"
  "    (< sandbox-level 1))\n"
  "  (allow default)\n"

Don't enable any sandbox for Mac OS X 10.8 and earlier OR if the sandbox-level is less than 1. The rest of the policy only applies for 10.9 later when sandbox-level >= 1. 

  "  (begin\n"
  "    (deny default)\n"

By default, we deny. i.e., for any capability not explicitly allowed here, do not allow it to be used. 

  "    (debug deny)\n"
  "\n"

For any rule that causes an action to be denied, log something in system.log. These log entries are easily viewed using the OS X "Console" application and filtering on "sandbox". 

  "    (define resolving-literal literal)\n"
  "    (define resolving-subpath subpath)\n"
  "    (define resolving-regex regex)\n"

Shortcut macros. 

  "    (define container-path appPath)\n"
  "    (define appdir-path appDir)\n"
  "    (define var-folders-re \"^/private/var/folders/[^/][^/]\")\n"
  "    (define var-folders2-re (string-append var-folders-re \"/[^/]+/[^/]\"))\n"
  "\n"
  "    (define (home-regex home-relative-regex)\n"
  "      (resolving-regex (string-append \"^\" (regex-quote home-path) home-relative-regex)))\n"
  "    (define (home-subpath home-relative-subpath)\n"
  "      (resolving-subpath (string-append home-path home-relative-subpath)))\n"
  "    (define (home-literal home-relative-literal)\n"
  "      (resolving-literal (string-append home-path home-relative-literal)))\n"
  "\n"
  "    (define (container-regex container-relative-regex)\n"
  "      (resolving-regex (string-append \"^\" (regex-quote container-path) container-relative-regex)))\n"
  "    (define (container-subpath container-relative-subpath)\n"
  "      (resolving-subpath (string-append container-path container-relative-subpath)))\n"
  "    (define (container-literal container-relative-literal)\n"
  "      (resolving-literal (string-append container-path container-relative-literal)))\n"
  "\n"
  "    (define (var-folders-regex var-folders-relative-regex)\n"
  "      (resolving-regex (string-append var-folders-re var-folders-relative-regex)))\n"
  "    (define (var-folders2-regex var-folders2-relative-regex)\n"
  "      (resolving-regex (string-append var-folders2-re var-folders2-relative-regex)))\n"
  "\n"
  "    (define (appdir-regex appdir-relative-regex)\n"
  "      (resolving-regex (string-append \"^\" (regex-quote appdir-path) appdir-relative-regex)))\n"
  "    (define (appdir-subpath appdir-relative-subpath)\n"
  "      (resolving-subpath (string-append appdir-path appdir-relative-subpath)))\n"
  "    (define (appdir-literal appdir-relative-literal)\n"
  "      (resolving-literal (string-append appdir-path appdir-relative-literal)))\n"
  "\n"
  "    (define (allow-shared-preferences-read domain)\n"
  "          (begin\n"
  "            (if (defined? `user-preference-read)\n"
  "              (allow user-preference-read (preference-domain domain)))\n"
  "            (allow file-read*\n"
  "                   (home-literal (string-append \"/Library/Preferences/\" domain \".plist\"))\n"
  "                   (home-regex (string-append \"/Library/Preferences/ByHost/\"
                              (regex-quote domain) \"\\..*\\.plist$\")))\n"
  "            ))\n"
  "\n"
  "    (define (allow-shared-list domain)\n"
  "      (allow file-read*\n"
  "             (home-regex (string-append \"/Library/Preferences/\" (regex-quote domain)))))\n"
  "\n"
Macros (needs more explanation) 

  "    (allow file-read-metadata)\n"
Does this allow file-read-metadata for all files? 
  "\n"
  "    (allow ipc-posix-shm\n"
  "        (ipc-posix-name-regex \"^/tmp/com.apple.csseed:\")\n"
  "        (ipc-posix-name-regex \"^CFPBS:\")\n"
  "        (ipc-posix-name-regex \"^AudioIO\"))\n"
IPC shared memory? 
  "\n"
  "    (allow file-read-metadata\n"
  "        (literal \"/home\")\n"
  "        (literal \"/net\")\n"
  "        (regex \"^/private/tmp/KSInstallAction\\.\")\n"
  "        (var-folders-regex \"/\")\n"
  "        (home-subpath \"/Library\"))\n"
Allow reading of file metadata for this directories and files. Is this redundant give the above "(allow file-read-metadata)" rule. 
  "\n"
  "    (allow signal (target self))\n"
  "    (allow job-creation (literal \"/Library/CoreMediaIO/Plug-Ins/DAL\"))\n"
  "    (allow iokit-set-properties (iokit-property \"IOAudioControlValue\"))\n"
  "\n"
  "    (allow mach-lookup\n"
  "        (global-name \"com.apple.coreservices.launchservicesd\")\n"
  "        (global-name \"com.apple.coreservices.appleevents\")\n"
  "        (global-name \"com.apple.pasteboard.1\")\n"
  "        (global-name \"com.apple.window_proxies\")\n"
  "        (global-name \"com.apple.windowserver.active\")\n"
  "        (global-name \"com.apple.audio.coreaudiod\")\n"
  "        (global-name \"com.apple.audio.audiohald\")\n"
  "        (global-name \"com.apple.PowerManagement.control\")\n"
  "        (global-name \"com.apple.cmio.VDCAssistant\")\n"
  "        (global-name \"com.apple.SystemConfiguration.configd\")\n"
  "        (global-name \"com.apple.iconservices\")\n"
  "        (global-name \"com.apple.cookied\")\n"
  "        (global-name \"com.apple.printuitool.agent\")\n"
  "        (global-name \"com.apple.printtool.agent\")\n"
  "        (global-name \"com.apple.cache_delete\")\n"
  "        (global-name \"com.apple.pluginkit.pkd\")\n"
  "        (global-name \"com.apple.bird\")\n"
  "        (global-name \"com.apple.ocspd\")\n"
  "        (global-name \"com.apple.cmio.AppleCameraAssistant\")\n"
  "        (global-name \"com.apple.DesktopServicesHelper\")\n"
  "        (global-name \"com.apple.printtool.daemon\"))\n"
  "\n"
  "    (allow iokit-open\n"
  "        (iokit-user-client-class \"IOHIDParamUserClient\")\n"
  "        (iokit-user-client-class \"IOAudioControlUserClient\")\n"
  "        (iokit-user-client-class \"IOAudioEngineUserClient\")\n"
  "        (iokit-user-client-class \"IGAccelDevice\")\n"
  "        (iokit-user-client-class \"nvDevice\")\n"
  "        (iokit-user-client-class \"nvSharedUserClient\")\n"
  "        (iokit-user-client-class \"nvFermiGLContext\")\n"
  "        (iokit-user-client-class \"IGAccelGLContext\")\n"
  "        (iokit-user-client-class \"IGAccelSharedUserClient\")\n"
  "        (iokit-user-client-class \"IGAccelVideoContextMain\")\n"
  "        (iokit-user-client-class \"IGAccelVideoContextMedia\")\n"
  "        (iokit-user-client-class \"IGAccelVideoContextVEBox\")\n"
  "        (iokit-user-client-class \"RootDomainUserClient\")\n"
  "        (iokit-user-client-class \"IOUSBDeviceUserClientV2\")\n"
  "        (iokit-user-client-class \"IOUSBInterfaceUserClientV2\"))\n"
  "\n"
  "; depending on systems, the 1st, 2nd or both rules are necessary\n"
  "    (allow-shared-preferences-read \"com.apple.HIToolbox\")\n"
  "    (allow file-read-data (literal \"/Library/Preferences/com.apple.HIToolbox.plist\"))\n"
  "\n"
  "    (allow-shared-preferences-read \"com.apple.ATS\")\n"
  "    (allow file-read-data (literal \"/Library/Preferences/.GlobalPreferences.plist\"))\n"
  "\n"
  "    (allow file-read*\n"
  "        (subpath \"/Library/Fonts\")\n"
  "        (subpath \"/Library/Audio/Plug-Ins\")\n"
  "        (subpath \"/Library/CoreMediaIO/Plug-Ins/DAL\")\n"
  "        (subpath \"/Library/Spelling\")\n"
  "        (subpath \"/private/etc/cups/ppd\")\n"
  "        (subpath \"/private/var/run/cupsd\")\n"
  "        (literal \"/\")\n"
  "        (literal \"/private/tmp\")\n"
  "        (literal \"/private/var/tmp\")\n"
  "\n"
  "        (home-literal \"/.CFUserTextEncoding\")\n"
  "        (home-literal \"/Library/Preferences/com.apple.DownloadAssessment.plist\")\n"
  "        (home-subpath \"/Library/Colors\")\n"
  "        (home-subpath \"/Library/Fonts\")\n"
  "        (home-subpath \"/Library/FontCollections\")\n"
  "        (home-subpath \"/Library/Keyboard Layouts\")\n"
  "        (home-subpath \"/Library/Input Methods\")\n"
  "        (home-subpath \"/Library/PDF Services\")\n"
  "        (home-subpath \"/Library/Spelling\")\n"
  "\n"
  "        (subpath appdir-path)\n"
  "\n"
  "        (literal appPath)\n"
  "        (literal appBinaryPath))\n"
  "\n"
  "    (allow-shared-list \"org.mozilla.plugincontainer\")\n"
  "\n"
  "; the following 2 rules should be removed when microphone and camera access\n"
  "; are brokered through the content process\n"
  "    (allow device-microphone)\n"
  "    (allow device-camera)\n"
  "\n"
  "    (allow file* (var-folders2-regex \"/com\\.apple\\.IntlDataCache\\.le$\"))\n"
  "    (allow file-read*\n"
  "        (var-folders2-regex \"/com\\.apple\\.IconServices/\")\n"
  "        (var-folders2-regex \"/[^/]+\\.mozrunner/extensions/[^/]+/chrome/[^/]+/content/[^/]+\\.j(s|ar)$\"))\n"
  "\n"
  "    (allow file-write* (var-folders2-regex \"/org\\.chromium\\.[a-zA-Z0-9]*$\"))\n"
  "    (allow file-read*\n"
  "        (home-regex \"/Library/Application Support/[^/]+/Extensions/[^/]/\")\n"
  "        (resolving-regex \"/Library/Application Support/[^/]+/Extensions/[^/]/\")\n"
  "        (home-regex \"/Library/Application Support/Firefox/Profiles/[^/]+/extensions/\")\n"
  "        (home-regex \"/Library/Application Support/Firefox/Profiles/[^/]+/weave/\"))\n"
  "\n"
  "; the following rules should be removed when printing and \n"
  "; opening a file from disk are brokered through the main process\n"
  "    (if\n"
  "      (< sandbox-level 2)\n"
  "      (allow file*\n"
  "          (require-not\n"
  "              (home-subpath \"/Library\")))\n"
  "      (allow file*\n"
  "          (require-all\n"
  "              (subpath home-path)\n"
  "              (require-not\n"
  "                  (home-subpath \"/Library\")))))\n"
  "\n"
  "; printing\n"
  "    (allow authorization-right-obtain\n"
  "           (right-name \"system.print.operator\")\n"
  "           (right-name \"system.printingmanager\"))\n"
  "    (allow mach-lookup\n"
  "           (global-name \"com.apple.printuitool.agent\")\n"
  "           (global-name \"com.apple.printtool.agent\")\n"
  "           (global-name \"com.apple.printtool.daemon\")\n"
  "           (global-name \"com.apple.sharingd\")\n"
  "           (global-name \"com.apple.metadata.mds\")\n"
  "           (global-name \"com.apple.mtmd.xpc\")\n"
  "           (global-name \"com.apple.FSEvents\")\n"
  "           (global-name \"com.apple.locum\")\n"
  "           (global-name \"com.apple.ImageCaptureExtension2.presence\"))\n"
  "    (allow file-read*\n"
  "           (home-literal \"/.cups/lpoptions\")\n"
  "           (home-literal \"/.cups/client.conf\")\n"
  "           (literal \"/private/etc/cups/lpoptions\")\n"
  "           (literal \"/private/etc/cups/client.conf\")\n"
  "           (subpath \"/private/etc/cups/ppd\")\n"
  "           (literal \"/private/var/run/cupsd\"))\n"
  "    (allow-shared-preferences-read \"org.cups.PrintingPrefs\")\n"
  "    (allow-shared-preferences-read \"com.apple.finder\")\n"
  "    (allow-shared-preferences-read \"com.apple.LaunchServices\")\n"
  "    (allow-shared-preferences-read \".GlobalPreferences\")\n"
  "    (allow network-outbound\n"
  "        (literal \"/private/var/run/cupsd\")\n"
  "        (literal \"/private/var/run/mDNSResponder\"))\n"
  "\n"
  "; print preview\n"
  "    (if (> macosMinorVersion 9)\n"
  "        (allow lsopen))\n"
  "    (allow file-write* file-issue-extension (var-folders2-regex \"/\"))\n"
  "    (allow file-read-xattr (literal \"/Applications/Preview.app\"))\n"
  "    (allow mach-task-name)\n"
  "    (allow mach-register)\n"
  "    (allow file-read-data\n"
  "        (regex \"^/Library/Printers/[^/]+/PDEs/[^/]+.plugin\")\n"
  "        (subpath \"/Library/PDF Services\")\n"
  "        (subpath \"/Applications/Preview.app\")\n"
  "        (home-literal \"/Library/Preferences/com.apple.ServicesMenu.Services.plist\"))\n"
  "    (allow mach-lookup\n"
  "        (global-name \"com.apple.pbs.fetch_services\")\n"
  "        (global-name \"com.apple.tsm.uiserver\")\n"
  "        (global-name \"com.apple.ls.boxd\")\n"
  "        (global-name \"com.apple.coreservices.quarantine-resolver\")\n"
  "        (global-name-regex \"_OpenStep$\"))\n"
  "    (allow appleevent-send\n"
  "        (appleevent-destination \"com.apple.preview\")\n"
  "        (appleevent-destination \"com.apple.imagecaptureextension2\"))\n"
  "\n"
  "; accelerated graphics\n"
  "    (allow-shared-preferences-read \"com.apple.opengl\")\n"
  "    (allow-shared-preferences-read \"com.nvidia.OpenGL\")\n"
  "    (allow mach-lookup\n"
  "        (global-name \"com.apple.cvmsServ\"))\n"
  "    (allow iokit-open\n"
  "        (iokit-connection \"IOAccelerator\")\n"
  "        (iokit-user-client-class \"IOAccelerationUserClient\")\n"
  "        (iokit-user-client-class \"IOSurfaceRootUserClient\")\n"
  "        (iokit-user-client-class \"IOSurfaceSendRight\")\n"
  "        (iokit-user-client-class \"IOFramebufferSharedUserClient\")\n"
  "        (iokit-user-client-class \"AppleSNBFBUserClient\")\n"
  "        (iokit-user-client-class \"AGPMClient\")\n"
  "        (iokit-user-client-class \"AppleGraphicsControlClient\")\n"
  "        (iokit-user-client-class \"AppleGraphicsPolicyClient\"))\n"
  "\n"
  "; bug 1153809\n"
  "    (allow iokit-open\n"
  "        (iokit-user-client-class \"NVDVDContextTesla\")\n"
  "        (iokit-user-client-class \"Gen6DVDContext\"))\n"
  "\n"
  "; bug 1190032\n"
  "    (allow file*\n"
  "        (home-regex \"/Library/Caches/TemporaryItems/plugtmp.*\"))\n"
  "\n"
  "; bug 1201935\n"
  "    (allow file-read*\n"
  "        (home-subpath \"/Library/Caches/TemporaryItems\"))\n"
  "\n"
TODO 
  "; bug 1237847\n"
  "    (allow file-read*\n"
  "        (home-subpath appTempDir))\n"
  "    (allow file-write*\n"
  "        (home-subpath appTempDir))\n"
  "  )\n"
  ")\n";

Allow full reads and writes to appTempDir which (in this example) is "/Users/<USERNAME>/Library/Caches/TemporaryItems/Temp-{62ac76fa-73fd-8f46-bd2b-12c4d53aa1cc}". The directory is reset each time Firefox starts.

Retrieved from "https://wiki.mozilla.org/index.php?title=Sandbox/OS_X_Rule_Set&oldid=1131145"