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.
99 lines
2.7 KiB
Go
99 lines
2.7 KiB
Go
// Copyright The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package procfs
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import (
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"bufio"
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"bytes"
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"errors"
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"fmt"
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"io"
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"strconv"
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"strings"
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"github.com/prometheus/procfs/internal/util"
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)
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// Interrupt represents a single interrupt line.
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type Interrupt struct {
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// Info is the type of interrupt.
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Info string
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// Devices is the name of the device that is located at that IRQ
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Devices string
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// Values is the number of interrupts per CPU.
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Values []string
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}
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// Interrupts models the content of /proc/interrupts. Key is the IRQ number.
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// - https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/deployment_guide/s2-proc-interrupts
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// - https://raspberrypi.stackexchange.com/questions/105802/explanation-of-proc-interrupts-output
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type Interrupts map[string]Interrupt
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// Interrupts creates a new instance from a given Proc instance.
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func (p Proc) Interrupts() (Interrupts, error) {
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data, err := util.ReadFileNoStat(p.fs.proc.Path("interrupts"))
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if err != nil {
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return nil, err
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}
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return parseInterrupts(bytes.NewReader(data))
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}
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func parseInterrupts(r io.Reader) (Interrupts, error) {
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var (
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interrupts = Interrupts{}
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scanner = bufio.NewScanner(r)
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)
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if !scanner.Scan() {
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return nil, errors.New("interrupts empty")
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}
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cpuNum := len(strings.Fields(scanner.Text())) // one header per cpu
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for scanner.Scan() {
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parts := strings.Fields(scanner.Text())
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if len(parts) == 0 { // skip empty lines
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continue
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}
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if len(parts) < 2 {
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return nil, fmt.Errorf("%w: Not enough fields in interrupts (expected 2+ fields but got %d): %s", ErrFileParse, len(parts), parts)
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}
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intName := parts[0][:len(parts[0])-1] // remove trailing :
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if len(parts) == 2 {
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interrupts[intName] = Interrupt{
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Info: "",
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Devices: "",
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Values: []string{
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parts[1],
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},
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}
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continue
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}
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intr := Interrupt{
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Values: parts[1 : cpuNum+1],
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}
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if _, err := strconv.Atoi(intName); err == nil { // numeral interrupt
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intr.Info = parts[cpuNum+1]
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intr.Devices = strings.Join(parts[cpuNum+2:], " ")
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} else {
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intr.Info = strings.Join(parts[cpuNum+1:], " ")
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}
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interrupts[intName] = intr
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}
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return interrupts, scanner.Err()
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}
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