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Block sandbox account from mounting disks #233

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Merged
webcoyote merged 2 commits into from
Sep 1, 2026
Merged

Block sandbox account from mounting disks #233

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b7a8646
Block sandbox account from mounting disks
webcoyote Sep 1, 2026
cc3d1f3
Better help messages when xcode not installed
webcoyote Sep 1, 2026
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7 changes: 6 additions & 1 deletion helpers/sv-ios-pick-device
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Original file line number Diff line number Diff line change
Expand Up @@ -24,7 +24,12 @@ def dt_key(d):


def main():
data = json.load(sys.stdin)
# `xcrun simctl` writes nothing to stdout when Xcode isn't installed
# (only the Command Line Tools). Exit non-zero rather than traceback.
try:
data = json.load(sys.stdin)
except json.JSONDecodeError:
sys.exit(1)

runtimes = [
r for r in data.get("runtimes", [])
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24 changes: 24 additions & 0 deletions sv
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Expand Up @@ -723,6 +723,18 @@ start_ios_simulator() {
abort "xcrun not found. Install Xcode or the Command Line Tools."
fi

# simctl ships with Xcode, not the Command Line Tools, so xcrun can
# exist while simctl does not. Check before using it so the failure
# names the actual problem.
# Note: `xcode-select --install` installs only the Command Line Tools,
# which do not include simctl. Full Xcode has no Apple-supported CLI
# installer, so point at the Mac App Store (mas) or the xcodes tool.
if ! /usr/bin/xcrun --find simctl >/dev/null 2>&1; then
abort "simctl not found; iOS simulator needs Xcode (Command Line Tools are not enough).\n" \
"Install from the Mac App Store: https://apps.apple.com/app/xcode/id497799835\n" \
" Then select it: sudo xcode-select -s /Applications/Xcode.app"
fi

# Select device type and runtime.
local device_type runtime pair
# shellcheck disable=SC2310 # ios_pick_device_and_runtime intentionally used in condition
Expand Down Expand Up @@ -1618,6 +1630,18 @@ heredoc SANDBOX_PROFILE_CONTENT << EOF
(allow file-read*
(subpath "/Volumes/Macintosh HD"))

;; Deny mounting disks
;; diskarbitrationd -- diskutil mount, hdiutil attach, Finder disk handling
;; NetAuthAgent -- NetFS: 'open smb://...', Connect to Server
;; NetAuthSysAgent
;; appleeventsd -- disallow osascript telling Finder to do it
(deny file-mount file-unmount)
(deny mach-lookup
(global-name "com.apple.DiskArbitration.diskarbitrationd")
(global-name "com.apple.NetAuthAgent")
(global-name "com.apple.NetAuthSysAgent")
(global-name "com.apple.appleeventsd"))

;; Block raw disk and packet-capture devices regardless of the broader
;; /dev write allow below. Defense in depth: /dev/*disk* is already
;; root:operator 640, but this removes reliance on POSIX perms alone.
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