Susana Ferreira a9fb2619e4 fix: always verify TLS on aibridgeproxyd upstream transport (#26131)
## Problem

aibridgeproxyd's HTTP transport (`proxy.Tr`) was configured with secure
TLS defaults only when an upstream proxy was set. Without one, it fell
back to [goproxy's default
transport](https://github.com/elazarl/goproxy/blob/v1.8.0/proxy.go#L152),
which has `InsecureSkipVerify: true`, leaving the connection between the
proxy and aibridge vulnerable to MITM on HTTPS deployments.

This PR moves the secure transport assignment outside the upstream proxy
branch so it applies unconditionally.

## Changes

* Apply secure TLS defaults to `proxy.Tr` unconditionally (verified
`RootCAs`, `MinVersion: TLS 1.2`).
* Add `TestProxy_AIBridgeTLSVerification` to cover the verification path
between the proxy and aibridge.

## Notes

* **Behavior change for `HTTPS_PROXY` env var**: previously, when
`UpstreamProxy` was unset, `proxy.Tr` honored `HTTP_PROXY` and
`HTTPS_PROXY` env vars. After this PR it does not, since MITM'd requests
now always go directly to aibridge. This matches the behavior when
`UpstreamProxy` is configured, which already ignored env vars.
* **HTTPS deployments with a private CA**: when `CoderAccessURL` is
HTTPS and its TLS certificate (or the load balancer's certificate
fronting it) is signed by a CA not in the system trust store, the proxy
will now fail with `x509: certificate signed by unknown authority`.

Closes
https://linear.app/codercom/issue/AIGOV-386/ai-bridge-proxy-uses-goproxy-default-with-tls-verification-disabled

> [!NOTE]
> Initially generated by Claude Opus 4.7, modified and reviewed by
@ssncferreira
2026-06-09 11:53:38 +01:00
2022-04-04 11:55:06 -05:00

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