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.
100 lines
2.7 KiB
Go
100 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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"errors"
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"io"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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)
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// NetDevSNMP6 is parsed from files in /proc/net/dev_snmp6/ or /proc/<PID>/net/dev_snmp6/.
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// The outer map's keys are interface names and the inner map's keys are stat names.
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//
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// If you'd like a total across all interfaces, please use the Snmp6() method of the Proc type.
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type NetDevSNMP6 map[string]map[string]uint64
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// Returns kernel/system statistics read from interface files within the /proc/net/dev_snmp6/
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// directory.
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func (fs FS) NetDevSNMP6() (NetDevSNMP6, error) {
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return newNetDevSNMP6(fs.proc.Path("net/dev_snmp6"))
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}
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// Returns kernel/system statistics read from interface files within the /proc/<PID>/net/dev_snmp6/
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// directory.
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func (p Proc) NetDevSNMP6() (NetDevSNMP6, error) {
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return newNetDevSNMP6(p.path("net/dev_snmp6"))
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}
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// newNetDevSNMP6 creates a new NetDevSNMP6 from the contents of the given directory.
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func newNetDevSNMP6(dir string) (NetDevSNMP6, error) {
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netDevSNMP6 := make(NetDevSNMP6)
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// The net/dev_snmp6 folders contain one file per interface
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ifaceFiles, err := os.ReadDir(dir)
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if err != nil {
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// On systems with IPv6 disabled, this directory won't exist.
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// Do nothing.
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if errors.Is(err, os.ErrNotExist) {
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return netDevSNMP6, err
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}
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return netDevSNMP6, err
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}
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for _, iFaceFile := range ifaceFiles {
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filePath := filepath.Join(dir, iFaceFile.Name())
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f, err := os.Open(filePath)
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if err != nil {
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return netDevSNMP6, err
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}
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defer f.Close()
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netDevSNMP6[iFaceFile.Name()], err = parseNetDevSNMP6Stats(f)
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if err != nil {
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return netDevSNMP6, err
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}
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}
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return netDevSNMP6, nil
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}
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func parseNetDevSNMP6Stats(r io.Reader) (map[string]uint64, error) {
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m := make(map[string]uint64)
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scanner := bufio.NewScanner(r)
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for scanner.Scan() {
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stat := strings.Fields(scanner.Text())
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if len(stat) < 2 {
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continue
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}
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key, val := stat[0], stat[1]
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// Expect stat name to contain "6" or be "ifIndex"
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if strings.Contains(key, "6") || key == "ifIndex" {
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v, err := strconv.ParseUint(val, 10, 64)
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if err != nil {
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return m, err
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}
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m[key] = v
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}
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}
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return m, scanner.Err()
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}
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