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.
49 lines
1.6 KiB
Go
49 lines
1.6 KiB
Go
// Copyright 2018 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 contains the default implementation for messages
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// generated by protoc-gen-go.
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//
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// WARNING: This package should only ever be imported by generated messages.
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// The compatibility agreement covers nothing except for functionality needed
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// to keep existing generated messages operational. Breakages that occur due
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// to unauthorized usages of this package are not the author's responsibility.
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package protoimpl
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import (
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"google.golang.org/protobuf/internal/filedesc"
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"google.golang.org/protobuf/internal/filetype"
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"google.golang.org/protobuf/internal/impl"
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"google.golang.org/protobuf/internal/protolazy"
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)
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// UnsafeEnabled specifies whether package unsafe can be used.
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const UnsafeEnabled = impl.UnsafeEnabled
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type (
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// Types used by generated code in init functions.
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DescBuilder = filedesc.Builder
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TypeBuilder = filetype.Builder
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// Types used by generated code to implement EnumType, MessageType, and ExtensionType.
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EnumInfo = impl.EnumInfo
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MessageInfo = impl.MessageInfo
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ExtensionInfo = impl.ExtensionInfo
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// Types embedded in generated messages.
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MessageState = impl.MessageState
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SizeCache = impl.SizeCache
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WeakFields = impl.WeakFields
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UnknownFields = impl.UnknownFields
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ExtensionFields = impl.ExtensionFields
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ExtensionFieldV1 = impl.ExtensionField
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Pointer = impl.Pointer
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LazyUnmarshalInfo = *protolazy.XXX_lazyUnmarshalInfo
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RaceDetectHookData = impl.RaceDetectHookData
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)
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var X impl.Export
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