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.
65 lines
2.1 KiB
Go
65 lines
2.1 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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type (
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// NetUDP represents the contents of /proc/net/udp{,6} file without the header.
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NetUDP []*netIPSocketLine
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// NetUDPSummary provides already computed values like the total queue lengths or
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// the total number of used sockets. In contrast to NetUDP it does not collect
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// the parsed lines into a slice.
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NetUDPSummary NetIPSocketSummary
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)
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// NetUDP returns the IPv4 kernel/networking statistics for UDP datagrams
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// read from /proc/net/udp.
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func (fs FS) NetUDP() (NetUDP, error) {
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return newNetUDP(fs.proc.Path("net/udp"))
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}
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// NetUDP6 returns the IPv6 kernel/networking statistics for UDP datagrams
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// read from /proc/net/udp6.
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func (fs FS) NetUDP6() (NetUDP, error) {
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return newNetUDP(fs.proc.Path("net/udp6"))
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}
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// NetUDPSummary returns already computed statistics like the total queue lengths
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// for UDP datagrams read from /proc/net/udp.
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func (fs FS) NetUDPSummary() (*NetUDPSummary, error) {
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return newNetUDPSummary(fs.proc.Path("net/udp"))
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}
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// NetUDP6Summary returns already computed statistics like the total queue lengths
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// for UDP datagrams read from /proc/net/udp6.
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func (fs FS) NetUDP6Summary() (*NetUDPSummary, error) {
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return newNetUDPSummary(fs.proc.Path("net/udp6"))
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}
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// newNetUDP creates a new NetUDP{,6} from the contents of the given file.
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func newNetUDP(file string) (NetUDP, error) {
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n, err := newNetIPSocket(file)
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n1 := NetUDP(n)
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return n1, err
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}
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func newNetUDPSummary(file string) (*NetUDPSummary, error) {
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n, err := newNetIPSocketSummary(file)
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if n == nil {
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return nil, err
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}
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n1 := NetUDPSummary(*n)
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return &n1, err
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}
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