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n0ctal
b0ef60670c
Remote node HTTP responses were read with an unbounded io.ReadAll, so a
broken or hostile node could force the master panel to buffer an arbitrarily
large body. The single Remote.do choke point that all node calls funnel
through now:
- validates the HTTP status before reading any success payload (a non-OK
body is only read up to a small bounded diagnostic snippet, so a node
cannot make the master buffer a large body just to return an error);
- fast-fails on an honestly-declared oversize Content-Length;
- reads the success body through readCappedBody, an io.LimitReader cap
(64 MiB) that rejects oversize with a typed error.
The 64 MiB cap bounds one response's wire/decompressed size; it is documented
as not a process-wide memory bound (endpoint-specific caps and a concurrency
budget remain follow-ups).
Tests cover the cap+1 boundary, an oversize streamed body, a normal envelope,
and non-OK status precedence.