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.
118 lines
3.1 KiB
Go
118 lines
3.1 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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import (
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"os"
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"strconv"
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"strings"
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"github.com/prometheus/procfs/internal/util"
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)
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// - https://man7.org/linux/man-pages/man5/proc_pid_statm.5.html
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// ProcStatm Provides memory usage information for a process, measured in memory pages.
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// Read from /proc/[pid]/statm.
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type ProcStatm struct {
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// The process ID.
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PID int
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// total program size (same as VmSize in status)
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Size uint64
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// resident set size (same as VmRSS in status)
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Resident uint64
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// number of resident shared pages (i.e., backed by a file)
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Shared uint64
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// text (code)
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Text uint64
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// library (unused since Linux 2.6; always 0)
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Lib uint64
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// data + stack
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Data uint64
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// dirty pages (unused since Linux 2.6; always 0)
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Dt uint64
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}
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// NewStatm returns the current status information of the process.
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//
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// Deprecated: Use p.Statm() instead.
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func (p Proc) NewStatm() (ProcStatm, error) {
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return p.Statm()
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}
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// Statm returns the current memory usage information of the process.
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func (p Proc) Statm() (ProcStatm, error) {
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data, err := util.ReadFileNoStat(p.path("statm"))
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if err != nil {
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return ProcStatm{}, err
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}
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statmSlice, err := parseStatm(data)
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if err != nil {
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return ProcStatm{}, err
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}
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procStatm := ProcStatm{
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PID: p.PID,
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Size: statmSlice[0],
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Resident: statmSlice[1],
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Shared: statmSlice[2],
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Text: statmSlice[3],
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Lib: statmSlice[4],
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Data: statmSlice[5],
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Dt: statmSlice[6],
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}
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return procStatm, nil
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}
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// parseStatm return /proc/[pid]/statm data to uint64 slice.
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func parseStatm(data []byte) ([]uint64, error) {
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var statmSlice []uint64
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statmItems := strings.Fields(string(data))
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for i := range statmItems {
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statmItem, err := strconv.ParseUint(statmItems[i], 10, 64)
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if err != nil {
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return nil, err
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}
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statmSlice = append(statmSlice, statmItem)
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}
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return statmSlice, nil
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}
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// SizeBytes returns the process of total program size in bytes.
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func (s ProcStatm) SizeBytes() uint64 {
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return s.Size * uint64(os.Getpagesize())
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}
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// ResidentBytes returns the process of resident set size in bytes.
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func (s ProcStatm) ResidentBytes() uint64 {
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return s.Resident * uint64(os.Getpagesize())
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}
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// SHRBytes returns the process of share memory size in bytes.
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func (s ProcStatm) SHRBytes() uint64 {
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return s.Shared * uint64(os.Getpagesize())
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}
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// TextBytes returns the process of text (code) size in bytes.
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func (s ProcStatm) TextBytes() uint64 {
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return s.Text * uint64(os.Getpagesize())
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}
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// DataBytes returns the process of data + stack size in bytes.
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func (s ProcStatm) DataBytes() uint64 {
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return s.Data * uint64(os.Getpagesize())
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}
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