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.
229 lines
7.4 KiB
Go
229 lines
7.4 KiB
Go
package redis
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import "context"
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type ScriptingFunctionsCmdable interface {
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Eval(ctx context.Context, script string, keys []string, args ...interface{}) *Cmd
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EvalSha(ctx context.Context, sha1 string, keys []string, args ...interface{}) *Cmd
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EvalRO(ctx context.Context, script string, keys []string, args ...interface{}) *Cmd
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EvalShaRO(ctx context.Context, sha1 string, keys []string, args ...interface{}) *Cmd
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ScriptExists(ctx context.Context, hashes ...string) *BoolSliceCmd
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ScriptFlush(ctx context.Context) *StatusCmd
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ScriptKill(ctx context.Context) *StatusCmd
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ScriptLoad(ctx context.Context, script string) *StringCmd
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FunctionLoad(ctx context.Context, code string) *StringCmd
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FunctionLoadReplace(ctx context.Context, code string) *StringCmd
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FunctionDelete(ctx context.Context, libName string) *StringCmd
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FunctionFlush(ctx context.Context) *StringCmd
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FunctionKill(ctx context.Context) *StringCmd
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FunctionFlushAsync(ctx context.Context) *StringCmd
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FunctionList(ctx context.Context, q FunctionListQuery) *FunctionListCmd
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FunctionDump(ctx context.Context) *StringCmd
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FunctionRestore(ctx context.Context, libDump string) *StringCmd
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FunctionStats(ctx context.Context) *FunctionStatsCmd
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FCall(ctx context.Context, function string, keys []string, args ...interface{}) *Cmd
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FCallRo(ctx context.Context, function string, keys []string, args ...interface{}) *Cmd
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FCallRO(ctx context.Context, function string, keys []string, args ...interface{}) *Cmd
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}
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func (c cmdable) Eval(ctx context.Context, script string, keys []string, args ...interface{}) *Cmd {
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return c.eval(ctx, "eval", script, keys, args...)
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}
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func (c cmdable) EvalRO(ctx context.Context, script string, keys []string, args ...interface{}) *Cmd {
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return c.eval(ctx, "eval_ro", script, keys, args...)
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}
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func (c cmdable) EvalSha(ctx context.Context, sha1 string, keys []string, args ...interface{}) *Cmd {
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return c.eval(ctx, "evalsha", sha1, keys, args...)
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}
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func (c cmdable) EvalShaRO(ctx context.Context, sha1 string, keys []string, args ...interface{}) *Cmd {
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return c.eval(ctx, "evalsha_ro", sha1, keys, args...)
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}
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func (c cmdable) eval(ctx context.Context, name, payload string, keys []string, args ...interface{}) *Cmd {
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cmdArgs := make([]interface{}, 3+len(keys), 3+len(keys)+len(args))
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cmdArgs[0] = name
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cmdArgs[1] = payload
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cmdArgs[2] = len(keys)
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for i, key := range keys {
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cmdArgs[3+i] = key
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}
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cmdArgs = appendArgs(cmdArgs, args)
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cmd := NewCmd(ctx, cmdArgs...)
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// it is possible that only args exist without a key.
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// rdb.eval(ctx, eval, script, nil, arg1, arg2)
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if len(keys) > 0 {
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cmd.SetFirstKeyPos(3)
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}
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_ = c(ctx, cmd)
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// Normalize NOSCRIPT to ErrNoScript for Script.Run/RunRO's EVAL fallback,
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// but only when the result is already readable: on the deferred
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// autopipeline face the call above merely enqueues, and reading the outcome
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// here would await execution — making the whole Eval family synchronous on
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// a face whose contract is to return immediately (review finding by codex
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// on #3942). When the result is still pending the normalization is skipped;
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// Script.Run/RunRO also match the raw NOSCRIPT prefix, so the fallback
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// keeps working on that face.
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if cmd.resultReady() {
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if err := cmd.rawErr(); err != nil && HasErrorPrefix(err, "NOSCRIPT") {
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cmd.SetErr(ErrNoScript)
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}
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}
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return cmd
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}
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func (c cmdable) ScriptExists(ctx context.Context, hashes ...string) *BoolSliceCmd {
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args := make([]interface{}, 2+len(hashes))
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args[0] = "script"
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args[1] = "exists"
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for i, hash := range hashes {
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args[2+i] = hash
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}
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cmd := NewBoolSliceCmd(ctx, args...)
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_ = c(ctx, cmd)
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return cmd
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}
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func (c cmdable) ScriptFlush(ctx context.Context) *StatusCmd {
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cmd := NewStatusCmd(ctx, "script", "flush")
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_ = c(ctx, cmd)
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return cmd
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}
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func (c cmdable) ScriptKill(ctx context.Context) *StatusCmd {
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cmd := NewStatusCmd(ctx, "script", "kill")
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_ = c(ctx, cmd)
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return cmd
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}
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func (c cmdable) ScriptLoad(ctx context.Context, script string) *StringCmd {
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cmd := NewStringCmd(ctx, "script", "load", script)
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_ = c(ctx, cmd)
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return cmd
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}
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// ------------------------------------------------------------------------------
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// FunctionListQuery is used with FunctionList to query for Redis libraries
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//
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// LibraryNamePattern - Use an empty string to get all libraries.
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// - Use a glob-style pattern to match multiple libraries with a matching name
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// - Use a library's full name to match a single library
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// WithCode - If true, it will return the code of the library
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type FunctionListQuery struct {
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LibraryNamePattern string
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WithCode bool
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}
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func (c cmdable) FunctionLoad(ctx context.Context, code string) *StringCmd {
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cmd := NewStringCmd(ctx, "function", "load", code)
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_ = c(ctx, cmd)
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return cmd
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}
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func (c cmdable) FunctionLoadReplace(ctx context.Context, code string) *StringCmd {
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cmd := NewStringCmd(ctx, "function", "load", "replace", code)
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_ = c(ctx, cmd)
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return cmd
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}
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func (c cmdable) FunctionDelete(ctx context.Context, libName string) *StringCmd {
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cmd := NewStringCmd(ctx, "function", "delete", libName)
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_ = c(ctx, cmd)
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return cmd
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}
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func (c cmdable) FunctionFlush(ctx context.Context) *StringCmd {
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cmd := NewStringCmd(ctx, "function", "flush")
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_ = c(ctx, cmd)
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return cmd
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}
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func (c cmdable) FunctionKill(ctx context.Context) *StringCmd {
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cmd := NewStringCmd(ctx, "function", "kill")
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_ = c(ctx, cmd)
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return cmd
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}
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func (c cmdable) FunctionFlushAsync(ctx context.Context) *StringCmd {
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cmd := NewStringCmd(ctx, "function", "flush", "async")
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_ = c(ctx, cmd)
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return cmd
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}
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func (c cmdable) FunctionList(ctx context.Context, q FunctionListQuery) *FunctionListCmd {
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args := make([]interface{}, 2, 5)
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args[0] = "function"
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args[1] = "list"
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if q.LibraryNamePattern != "" {
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args = append(args, "libraryname", q.LibraryNamePattern)
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}
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if q.WithCode {
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args = append(args, "withcode")
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}
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cmd := NewFunctionListCmd(ctx, args...)
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_ = c(ctx, cmd)
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return cmd
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}
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func (c cmdable) FunctionDump(ctx context.Context) *StringCmd {
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cmd := NewStringCmd(ctx, "function", "dump")
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_ = c(ctx, cmd)
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return cmd
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}
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func (c cmdable) FunctionRestore(ctx context.Context, libDump string) *StringCmd {
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cmd := NewStringCmd(ctx, "function", "restore", libDump)
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_ = c(ctx, cmd)
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return cmd
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}
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func (c cmdable) FunctionStats(ctx context.Context) *FunctionStatsCmd {
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cmd := NewFunctionStatsCmd(ctx, "function", "stats")
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_ = c(ctx, cmd)
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return cmd
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}
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func (c cmdable) FCall(ctx context.Context, function string, keys []string, args ...interface{}) *Cmd {
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cmdArgs := fcallArgs("fcall", function, keys, args...)
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cmd := NewCmd(ctx, cmdArgs...)
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if len(keys) > 0 {
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cmd.SetFirstKeyPos(3)
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}
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_ = c(ctx, cmd)
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return cmd
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}
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// FCallRo this function simply calls FCallRO,
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// Deprecated: to maintain convention FCallRO.
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func (c cmdable) FCallRo(ctx context.Context, function string, keys []string, args ...interface{}) *Cmd {
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return c.FCallRO(ctx, function, keys, args...)
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}
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func (c cmdable) FCallRO(ctx context.Context, function string, keys []string, args ...interface{}) *Cmd {
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cmdArgs := fcallArgs("fcall_ro", function, keys, args...)
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cmd := NewCmd(ctx, cmdArgs...)
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if len(keys) > 0 {
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cmd.SetFirstKeyPos(3)
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}
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_ = c(ctx, cmd)
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return cmd
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}
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func fcallArgs(command string, function string, keys []string, args ...interface{}) []interface{} {
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cmdArgs := make([]interface{}, 3+len(keys), 3+len(keys)+len(args))
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cmdArgs[0] = command
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cmdArgs[1] = function
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cmdArgs[2] = len(keys)
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for i, key := range keys {
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cmdArgs[3+i] = key
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}
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cmdArgs = append(cmdArgs, args...)
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return cmdArgs
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}
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