outbound: Strip peer-sent l5d-proxy-error headers
#1285
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If the outbound proxy is not configured to emit headers, then we shouldn't surface `l5d-proxy-error` headers sent by peer proxies. This change adds a module to the outbound HTTP endpoint stack to strip these headers when appropriate.
hawkw
approved these changes
Sep 22, 2021
olix0r
added a commit
to linkerd/linkerd2
that referenced
this pull request
Sep 23, 2021
This release improves the proxy's error handling, introducing a new `l5d-proxy-connection` header to signal from an inbound proxy when its peers outbound connections should be torn down. Furthermore, error handling has been improved so that the `l5d-proxy-error` header is only sent to trusted peers--the inbound proxy only emits this header when its client is meshed; and the outbound proxy can be configured to disable these headers via configuration. --- * build(deps): bump hyper from 0.14.12 to 0.14.13 (linkerd/linkerd2-proxy#1273) * build(deps): bump tracing-subscriber from 0.2.22 to 0.2.23 (linkerd/linkerd2-proxy#1274) * tracing: use `Span::or_current` when spawning tasks (linkerd/linkerd2-proxy#1272) * dns: Log TTL with resolution (linkerd/linkerd2-proxy#1275) * error-respond: Support stack target configuration (linkerd/linkerd2-proxy#1276) * build(deps): bump tracing-subscriber from 0.2.23 to 0.2.24 (linkerd/linkerd2-proxy#1277) * build(deps): bump tracing from 0.1.27 to 0.1.28 (linkerd/linkerd2-proxy#1278) * build(deps): bump tokio from 1.11.0 to 1.12.0 (linkerd/linkerd2-proxy#1279) * build(deps): bump http from 0.2.4 to 0.2.5 (linkerd/linkerd2-proxy#1280) * Support a `l5d-proxy-connection: close` header (linkerd/linkerd2-proxy#1281) * Avoid emitting informational headers to untrusted clients (linkerd/linkerd2-proxy#1282) * outbound: Only honor the `l5d-proxy-connection` header when meshed (linkerd/linkerd2-proxy#1283) * outbound: Disable informational headers by config (linkerd/linkerd2-proxy#1284) * outbound: Strip peer-sent `l5d-proxy-error` headers (linkerd/linkerd2-proxy#1285)
alpeb
pushed a commit
to linkerd/linkerd2
that referenced
this pull request
Sep 23, 2021
This release improves the proxy's error handling, introducing a new `l5d-proxy-connection` header to signal from an inbound proxy when its peers outbound connections should be torn down. Furthermore, error handling has been improved so that the `l5d-proxy-error` header is only sent to trusted peers--the inbound proxy only emits this header when its client is meshed; and the outbound proxy can be configured to disable these headers via configuration. --- * build(deps): bump hyper from 0.14.12 to 0.14.13 (linkerd/linkerd2-proxy#1273) * build(deps): bump tracing-subscriber from 0.2.22 to 0.2.23 (linkerd/linkerd2-proxy#1274) * tracing: use `Span::or_current` when spawning tasks (linkerd/linkerd2-proxy#1272) * dns: Log TTL with resolution (linkerd/linkerd2-proxy#1275) * error-respond: Support stack target configuration (linkerd/linkerd2-proxy#1276) * build(deps): bump tracing-subscriber from 0.2.23 to 0.2.24 (linkerd/linkerd2-proxy#1277) * build(deps): bump tracing from 0.1.27 to 0.1.28 (linkerd/linkerd2-proxy#1278) * build(deps): bump tokio from 1.11.0 to 1.12.0 (linkerd/linkerd2-proxy#1279) * build(deps): bump http from 0.2.4 to 0.2.5 (linkerd/linkerd2-proxy#1280) * Support a `l5d-proxy-connection: close` header (linkerd/linkerd2-proxy#1281) * Avoid emitting informational headers to untrusted clients (linkerd/linkerd2-proxy#1282) * outbound: Only honor the `l5d-proxy-connection` header when meshed (linkerd/linkerd2-proxy#1283) * outbound: Disable informational headers by config (linkerd/linkerd2-proxy#1284) * outbound: Strip peer-sent `l5d-proxy-error` headers (linkerd/linkerd2-proxy#1285)
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If the outbound proxy is not configured to emit headers, then we
shouldn't surface
l5d-proxy-errorheaders sent by peer proxies.This change adds a module to the outbound HTTP endpoint stack to strip
these headers when appropriate.