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.
98 lines
3.5 KiB
Go
98 lines
3.5 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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// Code generated by generate-types. DO NOT EDIT.
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package proto
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import (
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"math"
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"unicode/utf8"
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"google.golang.org/protobuf/encoding/protowire"
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"google.golang.org/protobuf/internal/errors"
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"google.golang.org/protobuf/internal/strs"
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"google.golang.org/protobuf/reflect/protoreflect"
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)
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var wireTypes = map[protoreflect.Kind]protowire.Type{
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protoreflect.BoolKind: protowire.VarintType,
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protoreflect.EnumKind: protowire.VarintType,
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protoreflect.Int32Kind: protowire.VarintType,
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protoreflect.Sint32Kind: protowire.VarintType,
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protoreflect.Uint32Kind: protowire.VarintType,
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protoreflect.Int64Kind: protowire.VarintType,
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protoreflect.Sint64Kind: protowire.VarintType,
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protoreflect.Uint64Kind: protowire.VarintType,
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protoreflect.Sfixed32Kind: protowire.Fixed32Type,
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protoreflect.Fixed32Kind: protowire.Fixed32Type,
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protoreflect.FloatKind: protowire.Fixed32Type,
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protoreflect.Sfixed64Kind: protowire.Fixed64Type,
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protoreflect.Fixed64Kind: protowire.Fixed64Type,
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protoreflect.DoubleKind: protowire.Fixed64Type,
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protoreflect.StringKind: protowire.BytesType,
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protoreflect.BytesKind: protowire.BytesType,
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protoreflect.MessageKind: protowire.BytesType,
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protoreflect.GroupKind: protowire.StartGroupType,
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}
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func (o MarshalOptions) marshalSingular(b []byte, fd protoreflect.FieldDescriptor, v protoreflect.Value) ([]byte, error) {
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switch fd.Kind() {
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case protoreflect.BoolKind:
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b = protowire.AppendVarint(b, protowire.EncodeBool(v.Bool()))
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case protoreflect.EnumKind:
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b = protowire.AppendVarint(b, uint64(v.Enum()))
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case protoreflect.Int32Kind:
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b = protowire.AppendVarint(b, uint64(int32(v.Int())))
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case protoreflect.Sint32Kind:
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b = protowire.AppendVarint(b, protowire.EncodeZigZag(int64(int32(v.Int()))))
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case protoreflect.Uint32Kind:
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b = protowire.AppendVarint(b, uint64(uint32(v.Uint())))
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case protoreflect.Int64Kind:
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b = protowire.AppendVarint(b, uint64(v.Int()))
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case protoreflect.Sint64Kind:
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b = protowire.AppendVarint(b, protowire.EncodeZigZag(v.Int()))
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case protoreflect.Uint64Kind:
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b = protowire.AppendVarint(b, v.Uint())
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case protoreflect.Sfixed32Kind:
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b = protowire.AppendFixed32(b, uint32(v.Int()))
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case protoreflect.Fixed32Kind:
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b = protowire.AppendFixed32(b, uint32(v.Uint()))
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case protoreflect.FloatKind:
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b = protowire.AppendFixed32(b, math.Float32bits(float32(v.Float())))
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case protoreflect.Sfixed64Kind:
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b = protowire.AppendFixed64(b, uint64(v.Int()))
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case protoreflect.Fixed64Kind:
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b = protowire.AppendFixed64(b, v.Uint())
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case protoreflect.DoubleKind:
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b = protowire.AppendFixed64(b, math.Float64bits(v.Float()))
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case protoreflect.StringKind:
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if strs.EnforceUTF8(fd) && !utf8.ValidString(v.String()) {
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return b, errors.InvalidUTF8(string(fd.FullName()))
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}
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b = protowire.AppendString(b, v.String())
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case protoreflect.BytesKind:
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b = protowire.AppendBytes(b, v.Bytes())
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case protoreflect.MessageKind:
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var pos int
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var err error
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b, pos = appendSpeculativeLength(b)
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b, err = o.marshalMessage(b, v.Message())
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if err != nil {
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return b, err
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}
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b = finishSpeculativeLength(b, pos)
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case protoreflect.GroupKind:
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var err error
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b, err = o.marshalMessage(b, v.Message())
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if err != nil {
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return b, err
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}
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b = protowire.AppendVarint(b, protowire.EncodeTag(fd.Number(), protowire.EndGroupType))
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default:
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return b, errors.New("invalid kind %v", fd.Kind())
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}
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return b, nil
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}
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