dckcandClaude Opus 5.5
f0557d29d6
The switchboard now serves a Cap'n Web Handle on each of its sockets:
public (no loopback or private addresses) and local. A socket's labels
are fixed in config, so holding the socket's fd is holding that handle;
constrain(labels) returns a narrower one, as Flower's Constrain returns
a narrower fd. Labels only accumulate: a missing key matches anything,
and a key both sides set must agree (labels.js, shared by both).
The switchboard enforces the labels; toybox's Egress no longer checks
URLs itself. It opens a session to its one switchboard socket, constrains
the handle to the vat's grant, and forwards through it; a WebSocket
crosses the session as a pair of message streams. A vat narrows its own
grant with env.egress.constrain().
Grants are now labels as JSON. One stored before, a bare host[:port],
reads as {host, port}.
pnpm start and the systemd units give toybox the public handle; the
switchboard unit binds the local one in its own 0700 runtime directory.
The tests give their toybox the local handle to reach an echo server,
and check that a toybox holding only the public one never reaches it.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
16 lines
555 B
Desktop File
16 lines
555 B
Desktop File
[Unit]
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Description=toybox switchboard (workerd, Cap'n Web egress handles)
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Requires=toybox-switchboard.socket
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[Service]
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# the local (localhost) handle goes where no other unit can open it;
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# hand it out deliberately, if ever
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ExecStart=/opt/toybox/node_modules/workerd/bin/workerd serve --experimental /opt/toybox/switchboard.capnp -S public=3 -s local=unix:/run/toybox-switchboard/local.sock
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RuntimeDirectory=toybox-switchboard
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RuntimeDirectoryMode=0700
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DynamicUser=yes
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ProtectSystem=strict
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ProtectHome=yes
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PrivateTmp=yes
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SystemCallFilter=@system-service
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