;;; Copyright (c) 2019 Apple Inc.  All Rights reserved.
;;;
;;; WARNING: The sandbox rules in this file currently constitute
;;; Apple System Private Interface and are subject to change at any time and
;;; without notice.
;;;
(version 1)

(deny default)
(deny file-map-executable process-info* nvram*)
(deny dynamic-code-generation)
(deny file-write*)

(import "system.sb")
(import "com.apple.corefoundation.sb")
(corefoundation)

;; TODO: as a daemon, we don't actually have a home directory.
;; Perhaps we should remove these boilerplate rules
;;; Homedir-relative path filters
(define (home-regex home-relative-regex)
    (regex (string-append "^" (regex-quote (param "HOME")) home-relative-regex)))

(define (home-subpath home-relative-subpath)
    (subpath (string-append (param "HOME") home-relative-subpath)))

(define (home-prefix home-relative-prefix)
    (prefix (string-append (param "HOME") home-relative-prefix)))

(define (home-literal home-relative-literal)
    (literal (string-append (param "HOME") home-relative-literal)))

;; For resolving symlinks, realpath(3), and equivalents.
(allow file-read-metadata)

;; For validating the entitlements and other info of clients.
(allow process-info-codesignature)
(allow process-info-pidinfo)
(allow process-info* (target self))

(allow user-preference-read (preference-domain "kCFPreferencesAnyApplication"))

;; Your preference domain
(allow user-preference-read user-preference-write
       (preference-domain "com.apple.sysextd"))

;; Read/write access to a temporary directory.
(allow file-read* file-write*
       (subpath (param "TMPDIR"))
       (subpath (param "DARWIN_CACHE_DIR")))

;; Read/write cache access
(let ((cache-path-filter (home-subpath "/Library/Caches/com.apple.sysextd")))
  (allow file-read* file-write* cache-path-filter)
  (allow file-issue-extension
    (require-all
      (extension-class "com.apple.app-sandbox.read" "com.apple.app-sandbox.read-write")
      cache-path-filter)))

;; for sandbox_init_with_parameters()
(allow mach-priv-host-port)

;; Read and write our SIP-protected filesystem area
(allow file-read* file-write* (subpath "/Library/SystemExtensions"))

;; Read and write the SIP-protected filesystem area for driver extensions
(allow file-read* file-write* (subpath "/Library/DriverExtensions"))

;; Read the bundles of apps, anywhere
(allow file-read*)

;; Talking to our friend daemons that start and manage the various kinds of extensions
(allow mach-lookup
    (global-name "com.apple.cmio.system-extensions")
    (global-name "com.apple.nesessionmanager.system-extensions")
    (global-name "com.apple.endpointsecurity.system-extensions")
    (global-name "com.apple.kernelmanagerd.system-extensions")
    (global-name "com.apple.KernelExtensionServer")
)

;; Receiving AuthRefs (in order to check them) from clients
(allow authorization-right-obtain
    (right-name "com.apple.system-extensions.admin"))

;; We need to use the system-wide MDS database or Security gets very very sad
(allow file-read* file-write* (subpath "/private/var/db/mds/system"))
(allow ipc-posix-shm (ipc-posix-name "com.apple.AppleDatabaseChanged"))

;; Check AMFITrustedKeys for validating "anchor apple" signatures
;; Copied from Security's framework.sb (why don't we get it automatically?)
;; On internal builds, allow clients to read the AMFITrustedKeys NVRAM variable
(with-filter (system-attribute apple-internal)
    (allow nvram-get (nvram-variable "AMFITrustedKeys")))

;; Various daemons needed to do our job
(allow mach-lookup (global-name
		    "com.apple.SecurityServer"
		    "com.apple.ocspd"
		    "com.apple.coreservices.quarantine-resolver"
		    "com.apple.lsd.mapdb"
		    "com.apple.UNCUserNotification"
		    "com.apple.security.syspolicy"
		    "com.apple.security.syspolicy.kext"
            "com.apple.lsd.modifydb"
            "com.apple.coreservices.launchservicesd"
		   ))