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R""(
(define TMPDIR (param "_GLOBAL_TMP_DIR"))
(deny default)
; Disallow creating setuid/setgid binaries, since that
; would allow breaking build user isolation.
(deny file-write-setugid)
; Allow forking.
(allow process-fork)
; Allow reading system information like #CPUs, etc.
(allow sysctl-read)
; Allow POSIX semaphores and shared memory.
(allow ipc-posix*)
; Allow socket creation.
(allow system-socket)
; Allow sending signals within the sandbox.
(allow signal (target same-sandbox))
; Allow getpwuid.
(allow mach-lookup (global-name "com.apple.system.opendirectoryd.libinfo"))
; Access to /tmp.
; The network-outbound/network-inbound ones are for unix domain sockets, which
; we allow access to in TMPDIR (but if we allow them more broadly, you could in
; theory escape the sandbox)
(allow file* process-exec network-outbound network-inbound
(literal "/tmp") (subpath TMPDIR))
; Some packages like to read the system version.
(allow file-read*
(literal "/System/Library/CoreServices/SystemVersion.plist")
(literal "/System/Library/CoreServices/SystemVersionCompat.plist"))
; Without this line clang cannot write to /dev/null, breaking some configure tests.
(allow file-read-metadata (literal "/dev"))
; Many packages like to do local networking in their test suites, but let's only
; allow it if the package explicitly asks for it.
(if (param "_ALLOW_LOCAL_NETWORKING")
(begin
(allow network* (local ip) (local tcp) (local udp))
; Allow access to /etc/resolv.conf (which is a symlink to
; /private/var/run/resolv.conf).
; TODO: deduplicate with sandbox-network.sb
(allow file-read-metadata
(literal "/var")
(literal "/etc")
(literal "/etc/resolv.conf")
(literal "/private/etc/resolv.conf"))
(allow file-read*
(literal "/private/var/run/resolv.conf"))
; Allow DNS lookups. This is even needed for localhost, which lots of tests rely on
(allow file-read-metadata (literal "/etc/hosts"))
(allow file-read* (literal "/private/etc/hosts"))
(allow network-outbound (remote unix-socket (path-literal "/private/var/run/mDNSResponder")))))
; Standard devices.
(allow file*
(literal "/dev/null")
(literal "/dev/random")
(literal "/dev/stderr")
(literal "/dev/stdin")
(literal "/dev/stdout")
(literal "/dev/tty")
(literal "/dev/urandom")
(literal "/dev/zero")
(subpath "/dev/fd"))
; Allow pseudo-terminals.
(allow file*
(literal "/dev/ptmx")
(regex #"^/dev/pty[a-z]+")
(regex #"^/dev/ttys[0-9]+"))
; Does nothing, but reduces build noise.
(allow file* (literal "/dev/dtracehelper"))
; Allow access to zoneinfo since libSystem needs it.
(allow file-read* (subpath "/usr/share/zoneinfo"))
(allow file-read* (subpath "/usr/share/locale"))
; This is mostly to get more specific log messages when builds try to
; access something in /etc or /var.
(allow file-read-metadata
(literal "/etc")
(literal "/var")
(literal "/private/var/tmp"))
; This is used by /bin/sh on macOS 10.15 and later.
(allow file*
(literal "/private/var/select/sh"))
; Allow Rosetta 2 to run x86_64 binaries on aarch64-darwin (and vice versa).
(allow file-read*
(subpath "/Library/Apple/usr/libexec/oah")
(subpath "/System/Library/Apple/usr/libexec/oah")
(subpath "/System/Library/LaunchDaemons/com.apple.oahd.plist")
(subpath "/Library/Apple/System/Library/LaunchDaemons/com.apple.oahd.plist"))
)""
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