;;; Copyright (c) 2020 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.
;;;
;;; Sourced from com.apple.sysextd.sb in the SystemExtensions project.
;;;
(version 1)

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

(allow iokit*)

;; rdar://problem/50446564
(allow process-exec*)

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

;; 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.kernelmanager_helper"))

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

;; 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/DriverExtensions")
  (subpath "/Library/KernelCollections")
  (subpath "/Library/StagedExtensions")
  (subpath "/private/var/db/KernelExtensionManagement"))

;; Read and write to (iSC)Preboot volume for bootpolicy
(allow file-read* file-write*
  (subpath "/System/Volumes/iSCPreboot")
  (subpath "/System/Volumes/Preboot"))

;; Read and write the telemetry data file
(allow file-read* file-write*
  (literal "/private/var/db/loadedkextmt.plist"))

;; Write to the console
(allow file-write*
  (literal "/dev/console"))

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

;; 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")))

;; NVRAM variables we need read/write access to - SideEffects.NVRAMClient.set()/delete()
(allow nvram*
  (nvram-variable "boot_errors")
  (nvram-variable "kcgen-data")
  (nvram-variable "osenvironment")
  (nvram-variable "40A0DDD2-77F8-4392-B4A3-1E7304206516:one-time-boot-command"))

;; NVRAM variables set by bootpolicy on our behalf
(allow nvram*
  (nvram-variable "policy-nonce-digests")
  (nvram-variable "40A0DDD2-77F8-4392-B4A3-1E7304206516:policy-nonce-digests")
  (nvram-variable "IONVRAM-FORCESYNCNOW-PROPERTY"))

;; NVRAM variables we need read access to - SideEffects.NVRAMClient.get()
(allow nvram-get
  (nvram-variable "boot-breadcrumbs"))

;; 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.FSEvents"
            "com.apple.DiskArbitration.diskarbitrationd"
            "com.apple.diskmanagementd"
            "com.apple.storagekitd.dm"
            "com.apple.kernelmanagerd"
           ))

;; As the daemon responsible for tracking, loading, and unloading kexts, we
;; should be able to do those things.
(allow system-kext*)