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.
72 lines
1.9 KiB
Go
72 lines
1.9 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 proto
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import (
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"google.golang.org/protobuf/internal/errors"
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"google.golang.org/protobuf/reflect/protoreflect"
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"google.golang.org/protobuf/runtime/protoiface"
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)
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// CheckInitialized returns an error if any required fields in m are not set.
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func CheckInitialized(m Message) error {
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// Treat a nil message interface as an "untyped" empty message,
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// which we assume to have no required fields.
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if m == nil {
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return nil
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}
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return checkInitialized(m.ProtoReflect())
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}
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// CheckInitialized returns an error if any required fields in m are not set.
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func checkInitialized(m protoreflect.Message) error {
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if methods := protoMethods(m); methods != nil && methods.CheckInitialized != nil {
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_, err := methods.CheckInitialized(protoiface.CheckInitializedInput{
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Message: m,
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})
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return err
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}
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return checkInitializedSlow(m)
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}
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func checkInitializedSlow(m protoreflect.Message) error {
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md := m.Descriptor()
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fds := md.Fields()
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for i, nums := 0, md.RequiredNumbers(); i < nums.Len(); i++ {
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fd := fds.ByNumber(nums.Get(i))
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if !m.Has(fd) {
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return errors.RequiredNotSet(string(fd.FullName()))
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}
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}
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var err error
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m.Range(func(fd protoreflect.FieldDescriptor, v protoreflect.Value) bool {
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switch {
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case fd.IsList():
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if fd.Message() == nil {
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return true
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}
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for i, list := 0, v.List(); i < list.Len() && err == nil; i++ {
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err = checkInitialized(list.Get(i).Message())
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}
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case fd.IsMap():
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if fd.MapValue().Message() == nil {
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return true
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}
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v.Map().Range(func(key protoreflect.MapKey, v protoreflect.Value) bool {
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err = checkInitialized(v.Message())
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return err == nil
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})
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default:
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if fd.Message() == nil {
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return true
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}
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err = checkInitialized(v.Message())
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}
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return err == nil
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})
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return err
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}
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