Add mitmproxy system user for UID-based iptables exclusion - #61
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The transparent proxy currently excludes upstream hosts by destination IP to prevent routing loops. However, sandbox-proxy.moxt.ai, web-api.moxt.ai, and admin.moxt.ai all share the same Cloudflare Anycast IPs, so excluding one inadvertently bypasses all of them. This creates a dedicated `mitmproxy` user so the proxy adapter can run under a separate UID. iptables then uses `--uid-owner` to bypass only the proxy adapter's own outbound traffic, allowing domain-level routing control regardless of shared IPs. Made-with: Cursor
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Summary
mitmproxysystem user in the E2B templatecp+update-ca-certificates)Context
The transparent proxy currently excludes upstream hosts (sandbox-proxy.moxt.ai, web-api.moxt.ai) by destination IP to prevent routing loops. However, these hosts share the same Cloudflare Anycast IPs as admin.moxt.ai, so excluding one inadvertently bypasses all
*.moxt.aisubdomains.With a dedicated user,
transparent-proxy.ts(in paramoxt) can spawn the proxy adapter asmitmproxyand useiptables --uid-ownerto bypass only the proxy adapter's own traffic — independent of destination IP.Depends on
paramoxt PR (to be created) that modifies
transparent-proxy.tsto:sudo -u mitmproxy--uid-owneriptables ruleMade with Cursor