fix(telemetry): detect intercepted uploads on client side#70
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The agent currently treats any HTTP 200 from the presigned-URL PUT as proof the upload reached S3 and immediately calls notify. A TLS- inspecting proxy, DLP appliance, or outbound-filtering firewall on a customer network can terminate that PUT mid-flight and synthesize a 200 response without forwarding the bytes — the run is then reported as a silent success despite no object ever existing in S3. Two checks, in order: 1. After the PUT returns 200, require x-amz-request-id and/or x-amz-id-2 on the response. Real S3 always sets these; a proxy fake-200 can't reproduce them. Missing both → non-retryable failure with the response Server header captured for forensics. 2. Before calling notify, POST /telemetry/confirm-upload to ask the backend whether the object actually exists in S3. A definitive uploaded=false is fatal (bail with reason). 404 (old backend without the endpoint), non-200, or transport errors fall through to notify, whose own server-side precheck remains the safety net. On success the agent prints a definitive "Upload confirmed in S3 (N bytes)" line, separate from "Backend processing started", so the user can tell upload-landed from processing-kicked-off. Adds tests for: real-S3 happy path, synthetic-200 PUT rejection, confirm=false fatal path, confirm 404 fallback, confirm 5xx fallback. Signed-off-by: Swarit Pandey <swarit@stepsecurity.io>
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Testing
./stepsecurity-dev-machine-guard --verbose./stepsecurity-dev-machine-guard --json | python3 -m json.toolmake lintmake testRelated Issues