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.
117 lines
3.0 KiB
Go
117 lines
3.0 KiB
Go
package redis
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import "context"
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type ACLCmdable interface {
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ACLDryRun(ctx context.Context, username string, command ...interface{}) *StringCmd
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ACLLog(ctx context.Context, count int64) *ACLLogCmd
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ACLLogReset(ctx context.Context) *StatusCmd
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ACLGenPass(ctx context.Context, bit int) *StringCmd
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ACLSetUser(ctx context.Context, username string, rules ...string) *StatusCmd
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ACLDelUser(ctx context.Context, username string) *IntCmd
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ACLUsers(ctx context.Context) *StringSliceCmd
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ACLWhoAmI(ctx context.Context) *StringCmd
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ACLList(ctx context.Context) *StringSliceCmd
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ACLCat(ctx context.Context) *StringSliceCmd
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ACLCatArgs(ctx context.Context, options *ACLCatArgs) *StringSliceCmd
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}
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type ACLCatArgs struct {
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Category string
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}
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func (c cmdable) ACLDryRun(ctx context.Context, username string, command ...interface{}) *StringCmd {
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args := make([]interface{}, 0, 3+len(command))
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args = append(args, "acl", "dryrun", username)
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args = append(args, command...)
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cmd := NewStringCmd(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) ACLLog(ctx context.Context, count int64) *ACLLogCmd {
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args := make([]interface{}, 0, 3)
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args = append(args, "acl", "log")
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if count > 0 {
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args = append(args, count)
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}
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cmd := NewACLLogCmd(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) ACLLogReset(ctx context.Context) *StatusCmd {
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cmd := NewStatusCmd(ctx, "acl", "log", "reset")
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_ = c(ctx, cmd)
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return cmd
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}
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func (c cmdable) ACLDelUser(ctx context.Context, username string) *IntCmd {
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cmd := NewIntCmd(ctx, "acl", "deluser", username)
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_ = c(ctx, cmd)
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return cmd
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}
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func (c cmdable) ACLSetUser(ctx context.Context, username string, rules ...string) *StatusCmd {
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args := make([]interface{}, 3+len(rules))
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args[0] = "acl"
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args[1] = "setuser"
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args[2] = username
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for i, rule := range rules {
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args[i+3] = rule
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}
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cmd := NewStatusCmd(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) ACLGenPass(ctx context.Context, bit int) *StringCmd {
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args := make([]interface{}, 0, 3)
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args = append(args, "acl", "genpass")
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if bit > 0 {
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args = append(args, bit)
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}
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cmd := NewStringCmd(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) ACLUsers(ctx context.Context) *StringSliceCmd {
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cmd := NewStringSliceCmd(ctx, "acl", "users")
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_ = c(ctx, cmd)
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return cmd
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}
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func (c cmdable) ACLWhoAmI(ctx context.Context) *StringCmd {
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cmd := NewStringCmd(ctx, "acl", "whoami")
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_ = c(ctx, cmd)
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return cmd
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}
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func (c cmdable) ACLList(ctx context.Context) *StringSliceCmd {
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cmd := NewStringSliceCmd(ctx, "acl", "list")
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_ = c(ctx, cmd)
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return cmd
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}
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func (c cmdable) ACLCat(ctx context.Context) *StringSliceCmd {
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cmd := NewStringSliceCmd(ctx, "acl", "cat")
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_ = c(ctx, cmd)
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return cmd
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}
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func (c cmdable) ACLCatArgs(ctx context.Context, options *ACLCatArgs) *StringSliceCmd {
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// if there is a category passed, build new cmd, if there isn't - use the ACLCat method
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if options != nil && options.Category != "" {
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cmd := NewStringSliceCmd(ctx, "acl", "cat", options.Category)
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_ = c(ctx, cmd)
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return cmd
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}
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return c.ACLCat(ctx)
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}
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