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.
138 lines
2.3 KiB
Go
138 lines
2.3 KiB
Go
package internal
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import (
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"context"
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"math"
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"net"
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"strconv"
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"strings"
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"time"
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"github.com/redis/go-redis/v9/internal/util"
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)
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// String representations of special float values.
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// Values are lowercase for consistency with Redis RESP2 protocol responses.
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const (
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NaN = "nan" // Not a Number
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Inf = "inf" // Positive infinity
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NInf = "-inf" // Negative infinity
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)
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// FormatFloat formats a float64 to string, normalizing special values
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// (NaN, Inf) to lowercase for consistency with Redis RESP2 protocol.
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func FormatFloat(f float64) string {
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switch {
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case math.IsNaN(f):
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return NaN
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case math.IsInf(f, 1):
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return Inf
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case math.IsInf(f, -1):
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return NInf
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default:
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return strconv.FormatFloat(f, 'f', -1, 64)
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}
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}
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func Sleep(ctx context.Context, dur time.Duration) error {
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t := time.NewTimer(dur)
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defer t.Stop()
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select {
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case <-t.C:
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return nil
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case <-ctx.Done():
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return ctx.Err()
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}
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}
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func ToLower(s string) string {
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if isLower(s) {
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return s
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}
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b := make([]byte, len(s))
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for i := range b {
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c := s[i]
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if c >= 'A' && c <= 'Z' {
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c += 'a' - 'A'
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}
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b[i] = c
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}
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return util.BytesToString(b)
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}
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func isLower(s string) bool {
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for i := 0; i < len(s); i++ {
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c := s[i]
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if c >= 'A' && c <= 'Z' {
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return false
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}
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}
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return true
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}
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func ReplaceSpaces(s string) string {
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return strings.ReplaceAll(s, " ", "-")
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}
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func GetAddr(addr string) string {
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ind := strings.LastIndexByte(addr, ':')
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if ind == -1 {
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return ""
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}
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if strings.IndexByte(addr, '.') != -1 {
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return addr
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}
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if addr[0] == '[' {
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return addr
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}
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return net.JoinHostPort(addr[:ind], addr[ind+1:])
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}
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func ToInteger(val interface{}) int {
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switch v := val.(type) {
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case int:
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return v
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case int64:
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return int(v)
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case string:
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i, _ := strconv.Atoi(v)
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return i
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default:
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return 0
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}
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}
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func ToFloat(val interface{}) float64 {
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switch v := val.(type) {
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case float64:
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return v
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case string:
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f, _ := strconv.ParseFloat(v, 64)
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return f
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default:
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return 0.0
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}
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}
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func ToString(val interface{}) string {
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if str, ok := val.(string); ok {
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return str
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}
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return ""
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}
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func ToStringSlice(val interface{}) []string {
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if arr, ok := val.([]interface{}); ok {
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result := make([]string, len(arr))
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for i, v := range arr {
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result[i] = ToString(v)
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}
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return result
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}
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return nil
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}
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