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Bind the proxy to SECRETS_PROXY_BIND_HOST #47

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Merged
czpython merged 1 commit into from
Sep 7, 2026
Merged

Bind the proxy to SECRETS_PROXY_BIND_HOST #47

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4 changes: 3 additions & 1 deletion deploy/proxy/Dockerfile
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Original file line number Diff line number Diff line change
Expand Up @@ -2,4 +2,6 @@ FROM mitmproxy/mitmproxy:12.2.3

COPY swap.py /addon/swap.py

CMD ["mitmdump", "--listen-host=0.0.0.0", "--listen-port=8880", "--set=flow_detail=1", "-s", "/addon/swap.py"]
# A host-networked deployment binds one interface. It sets the variable and
# keeps the command.
CMD ["sh", "-c", "exec mitmdump --listen-host=\"${SECRETS_PROXY_BIND_HOST:-0.0.0.0}\" --listen-port=8880 --set=flow_detail=1 -s /addon/swap.py"]
8 changes: 5 additions & 3 deletions docs/deploy.md
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Expand Up @@ -278,9 +278,11 @@ placeholder for the real credential on the way out. Two pieces run this:

- **The proxy** is `ghcr.io/czpython/drukbox/proxy`: the official
`mitmproxy/mitmproxy` image with the addon `deploy/proxy/swap.py` built in.
It listens on 8880 and reads the exchange address from
`SECRETS_EXCHANGE_URL`. A checkout can mount the addon into the official
image instead. It terminates TLS only for the hosts
It listens on 8880 at `SECRETS_PROXY_BIND_HOST`, `0.0.0.0` by default, and
reads the exchange address from `SECRETS_EXCHANGE_URL`. A deployment on the
host network sets the bind host to the one address its sandboxes dial. On a
public host an open listener is an open proxy. A checkout can mount the
addon into the official image instead. It terminates TLS only for the hosts
that have a registered secret and tunnels every other host blind. It
refuses a destination that resolves to a loopback, private, link-local, or
metadata address. It makes its CA on first start and keeps it in a volume.
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