4d9a26498e
Paste a secret, get a link, send it. The first person to open it and press
Reveal sees the secret; the link dies at that moment. The recipient needs a
browser and nothing else — no account, no client, no installed tooling.
The server cannot read what it stores. AES-256-GCM happens in the browser and
the key lives in the URL fragment, which browsers never transmit, so hushd
holds ciphertext and no key material. That is a property of where the key sits
rather than a promise about our conduct, which is why there is deliberately no
endpoint accepting a plaintext secret and no server-side-encryption fallback:
two guarantees behind one URL would be worse than one honest guarantee.
Three decisions carry the design:
* GET /s/{id} touches NO storage, not even to check existence. Slack, Teams,
WhatsApp, iMessage and Outlook Safe Links all fetch a URL before a human
sees it, so destroying on GET would destroy most secrets in transit and the
recipient's "already used" would be indistinguishable from interception.
Only POST /reveal consumes. Bot user-agent detection is an arms race;
removing the side effect from GET is not. Pinned by
TestGettingTheRevealPageNeverConsumesTheSecret.
* Destruction is one Redis GETDEL, which is atomic. GET-then-DEL has a window
where two simultaneous readers both win, and for a one-time secret that
window is the product. The store contract demands atomicity and the same
concurrency test runs against both implementations.
* Missing, already-revealed, expired and evicted are ONE indistinguishable
410. Separating them would confirm to a prober that a given link was real.
The secret id IS the capability, so secret.ID is a struct whose every
accidental path — %v, %s, String(), slog, json.Marshal — emits a redacted
handle or refuses, and the raw value needs an explicit Value(). The first
version tried to prevent leaks by implementing no String() at all; its own test
caught that Go's fmt prints unexported fields anyway, so forbidding the method
had removed the control rather than the leak.
Operationally: structured JSON on stdout in the fleet's wire format, which
Vector already collects with no annotation; six hush_* metrics on the chassis
registry with no id, IP or path in any label; five alert rules wired into
vmalert. The public Ingress enumerates /, /s/ and /api/ so /metrics, /healthz
and /readyz share the port but are unreachable from the internet — no
basic-auth middleware to maintain and get wrong.
Dependencies are vendored because go-chassis is private: the Woodpecker test
step and the in-cluster Kaniko build both run -mod=vendor with GOPROXY=off and
hold no git credential.
cmd/hush-mcp is a stdio MCP server doing the same client-side crypto locally,
so using hush from an agent preserves the same guarantee as using it from a
browser.
61 lines
2.0 KiB
Go
61 lines
2.0 KiB
Go
// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package protoimpl
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import (
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"google.golang.org/protobuf/internal/version"
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)
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const (
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// MaxVersion is the maximum supported version for generated .pb.go files.
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// It is always the current version of the module.
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MaxVersion = version.Minor
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// GenVersion is the runtime version required by generated .pb.go files.
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// This is incremented when generated code relies on new functionality
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// in the runtime.
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GenVersion = 20
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// MinVersion is the minimum supported version for generated .pb.go files.
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// This is incremented when the runtime drops support for old code.
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MinVersion = 0
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)
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// EnforceVersion is used by code generated by protoc-gen-go
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// to statically enforce minimum and maximum versions of this package.
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// A compilation failure implies either that:
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// - the runtime package is too old and needs to be updated OR
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// - the generated code is too old and needs to be regenerated.
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//
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// The runtime package can be upgraded by running:
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//
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// go get google.golang.org/protobuf
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//
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// The generated code can be regenerated by running:
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//
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// protoc --go_out=${PROTOC_GEN_GO_ARGS} ${PROTO_FILES}
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//
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// Example usage by generated code:
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//
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// const (
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// // Verify that this generated code is sufficiently up-to-date.
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// _ = protoimpl.EnforceVersion(genVersion - protoimpl.MinVersion)
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// // Verify that runtime/protoimpl is sufficiently up-to-date.
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// _ = protoimpl.EnforceVersion(protoimpl.MaxVersion - genVersion)
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// )
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//
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// The genVersion is the current minor version used to generated the code.
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// This compile-time check relies on negative integer overflow of a uint
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// being a compilation failure (guaranteed by the Go specification).
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type EnforceVersion uint
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// This enforces the following invariant:
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//
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// MinVersion ≤ GenVersion ≤ MaxVersion
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const (
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_ = EnforceVersion(GenVersion - MinVersion)
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_ = EnforceVersion(MaxVersion - GenVersion)
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)
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