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.
46 lines
1.4 KiB
Go
46 lines
1.4 KiB
Go
// Copyright 2018 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package proto
|
|
|
|
import (
|
|
"google.golang.org/protobuf/internal/errors"
|
|
"google.golang.org/protobuf/reflect/protoreflect"
|
|
)
|
|
|
|
// Message is the top-level interface that all messages must implement.
|
|
// It provides access to a reflective view of a message.
|
|
// Any implementation of this interface may be used with all functions in the
|
|
// protobuf module that accept a Message, except where otherwise specified.
|
|
//
|
|
// This is the v2 interface definition for protobuf messages.
|
|
// The v1 interface definition is [github.com/golang/protobuf/proto.Message].
|
|
//
|
|
// - To convert a v1 message to a v2 message,
|
|
// use [google.golang.org/protobuf/protoadapt.MessageV2Of].
|
|
// - To convert a v2 message to a v1 message,
|
|
// use [google.golang.org/protobuf/protoadapt.MessageV1Of].
|
|
type Message = protoreflect.ProtoMessage
|
|
|
|
// Error matches all errors produced by packages in the protobuf module
|
|
// according to [errors.Is].
|
|
//
|
|
// Example usage:
|
|
//
|
|
// if errors.Is(err, proto.Error) { ... }
|
|
var Error error
|
|
|
|
func init() {
|
|
Error = errors.Error
|
|
}
|
|
|
|
// MessageName returns the full name of m.
|
|
// If m is nil, it returns an empty string.
|
|
func MessageName(m Message) protoreflect.FullName {
|
|
if m == nil {
|
|
return ""
|
|
}
|
|
return m.ProtoReflect().Descriptor().FullName()
|
|
}
|