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.
354 lines
8.9 KiB
Go
354 lines
8.9 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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"bufio"
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"bytes"
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"fmt"
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"io"
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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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// ProcSnmp models the content of /proc/<pid>/net/snmp.
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type ProcSnmp struct {
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// The process ID.
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PID int
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Ip
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Icmp
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IcmpMsg
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Tcp
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Udp
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UdpLite
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}
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type Ip struct { // nolint:revive
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Forwarding *float64
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DefaultTTL *float64
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InReceives *float64
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InHdrErrors *float64
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InAddrErrors *float64
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ForwDatagrams *float64
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InUnknownProtos *float64
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InDiscards *float64
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InDelivers *float64
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OutRequests *float64
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OutDiscards *float64
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OutNoRoutes *float64
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ReasmTimeout *float64
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ReasmReqds *float64
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ReasmOKs *float64
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ReasmFails *float64
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FragOKs *float64
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FragFails *float64
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FragCreates *float64
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}
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type Icmp struct { // nolint:revive
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InMsgs *float64
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InErrors *float64
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InCsumErrors *float64
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InDestUnreachs *float64
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InTimeExcds *float64
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InParmProbs *float64
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InSrcQuenchs *float64
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InRedirects *float64
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InEchos *float64
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InEchoReps *float64
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InTimestamps *float64
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InTimestampReps *float64
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InAddrMasks *float64
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InAddrMaskReps *float64
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OutMsgs *float64
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OutErrors *float64
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OutDestUnreachs *float64
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OutTimeExcds *float64
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OutParmProbs *float64
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OutSrcQuenchs *float64
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OutRedirects *float64
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OutEchos *float64
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OutEchoReps *float64
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OutTimestamps *float64
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OutTimestampReps *float64
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OutAddrMasks *float64
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OutAddrMaskReps *float64
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}
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type IcmpMsg struct {
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InType3 *float64
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OutType3 *float64
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}
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type Tcp struct { // nolint:revive
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RtoAlgorithm *float64
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RtoMin *float64
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RtoMax *float64
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MaxConn *float64
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ActiveOpens *float64
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PassiveOpens *float64
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AttemptFails *float64
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EstabResets *float64
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CurrEstab *float64
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InSegs *float64
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OutSegs *float64
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RetransSegs *float64
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InErrs *float64
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OutRsts *float64
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InCsumErrors *float64
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}
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type Udp struct { // nolint:revive
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InDatagrams *float64
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NoPorts *float64
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InErrors *float64
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OutDatagrams *float64
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RcvbufErrors *float64
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SndbufErrors *float64
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InCsumErrors *float64
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IgnoredMulti *float64
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}
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type UdpLite struct { // nolint:revive
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InDatagrams *float64
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NoPorts *float64
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InErrors *float64
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OutDatagrams *float64
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RcvbufErrors *float64
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SndbufErrors *float64
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InCsumErrors *float64
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IgnoredMulti *float64
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}
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func (p Proc) Snmp() (ProcSnmp, error) {
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filename := p.path("net/snmp")
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data, err := util.ReadFileNoStat(filename)
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if err != nil {
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return ProcSnmp{PID: p.PID}, err
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}
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procSnmp, err := parseSnmp(bytes.NewReader(data), filename)
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procSnmp.PID = p.PID
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return procSnmp, err
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}
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// parseSnmp parses the metrics from proc/<pid>/net/snmp file
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// and returns a map contains those metrics (e.g. {"Ip": {"Forwarding": 2}}).
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func parseSnmp(r io.Reader, fileName string) (ProcSnmp, error) {
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var (
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scanner = bufio.NewScanner(r)
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procSnmp = ProcSnmp{}
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)
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for scanner.Scan() {
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nameParts := strings.Split(scanner.Text(), " ")
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scanner.Scan()
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valueParts := strings.Split(scanner.Text(), " ")
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// Remove trailing :.
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protocol := strings.TrimSuffix(nameParts[0], ":")
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if len(nameParts) != len(valueParts) {
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return procSnmp, fmt.Errorf("%w: mismatch field count mismatch in %s: %s",
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ErrFileParse, fileName, protocol)
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}
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for i := 1; i < len(nameParts); i++ {
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value, err := strconv.ParseFloat(valueParts[i], 64)
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if err != nil {
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return procSnmp, err
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}
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key := nameParts[i]
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switch protocol {
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case "Ip":
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switch key {
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case "Forwarding":
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procSnmp.Forwarding = &value
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case "DefaultTTL":
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procSnmp.DefaultTTL = &value
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case "InReceives":
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procSnmp.InReceives = &value
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case "InHdrErrors":
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procSnmp.InHdrErrors = &value
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case "InAddrErrors":
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procSnmp.InAddrErrors = &value
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case "ForwDatagrams":
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procSnmp.ForwDatagrams = &value
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case "InUnknownProtos":
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procSnmp.InUnknownProtos = &value
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case "InDiscards":
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procSnmp.InDiscards = &value
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case "InDelivers":
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procSnmp.InDelivers = &value
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case "OutRequests":
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procSnmp.OutRequests = &value
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case "OutDiscards":
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procSnmp.OutDiscards = &value
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case "OutNoRoutes":
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procSnmp.OutNoRoutes = &value
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case "ReasmTimeout":
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procSnmp.ReasmTimeout = &value
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case "ReasmReqds":
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procSnmp.ReasmReqds = &value
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case "ReasmOKs":
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procSnmp.ReasmOKs = &value
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case "ReasmFails":
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procSnmp.ReasmFails = &value
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case "FragOKs":
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procSnmp.FragOKs = &value
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case "FragFails":
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procSnmp.FragFails = &value
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case "FragCreates":
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procSnmp.FragCreates = &value
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}
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case "Icmp":
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switch key {
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case "InMsgs":
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procSnmp.InMsgs = &value
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case "InErrors":
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procSnmp.Icmp.InErrors = &value
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case "InCsumErrors":
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procSnmp.Icmp.InCsumErrors = &value
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case "InDestUnreachs":
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procSnmp.InDestUnreachs = &value
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case "InTimeExcds":
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procSnmp.InTimeExcds = &value
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case "InParmProbs":
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procSnmp.InParmProbs = &value
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case "InSrcQuenchs":
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procSnmp.InSrcQuenchs = &value
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case "InRedirects":
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procSnmp.InRedirects = &value
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case "InEchos":
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procSnmp.InEchos = &value
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case "InEchoReps":
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procSnmp.InEchoReps = &value
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case "InTimestamps":
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procSnmp.InTimestamps = &value
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case "InTimestampReps":
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procSnmp.InTimestampReps = &value
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case "InAddrMasks":
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procSnmp.InAddrMasks = &value
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case "InAddrMaskReps":
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procSnmp.InAddrMaskReps = &value
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case "OutMsgs":
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procSnmp.OutMsgs = &value
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case "OutErrors":
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procSnmp.OutErrors = &value
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case "OutDestUnreachs":
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procSnmp.OutDestUnreachs = &value
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case "OutTimeExcds":
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procSnmp.OutTimeExcds = &value
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case "OutParmProbs":
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procSnmp.OutParmProbs = &value
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case "OutSrcQuenchs":
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procSnmp.OutSrcQuenchs = &value
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case "OutRedirects":
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procSnmp.OutRedirects = &value
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case "OutEchos":
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procSnmp.OutEchos = &value
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case "OutEchoReps":
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procSnmp.OutEchoReps = &value
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case "OutTimestamps":
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procSnmp.OutTimestamps = &value
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case "OutTimestampReps":
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procSnmp.OutTimestampReps = &value
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case "OutAddrMasks":
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procSnmp.OutAddrMasks = &value
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case "OutAddrMaskReps":
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procSnmp.OutAddrMaskReps = &value
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}
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case "IcmpMsg":
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switch key {
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case "InType3":
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procSnmp.InType3 = &value
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case "OutType3":
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procSnmp.OutType3 = &value
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}
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case "Tcp":
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switch key {
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case "RtoAlgorithm":
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procSnmp.RtoAlgorithm = &value
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case "RtoMin":
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procSnmp.RtoMin = &value
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case "RtoMax":
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procSnmp.RtoMax = &value
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case "MaxConn":
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procSnmp.MaxConn = &value
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case "ActiveOpens":
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procSnmp.ActiveOpens = &value
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case "PassiveOpens":
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procSnmp.PassiveOpens = &value
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case "AttemptFails":
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procSnmp.AttemptFails = &value
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case "EstabResets":
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procSnmp.EstabResets = &value
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case "CurrEstab":
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procSnmp.CurrEstab = &value
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case "InSegs":
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procSnmp.InSegs = &value
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case "OutSegs":
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procSnmp.OutSegs = &value
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case "RetransSegs":
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procSnmp.RetransSegs = &value
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case "InErrs":
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procSnmp.InErrs = &value
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case "OutRsts":
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procSnmp.OutRsts = &value
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case "InCsumErrors":
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procSnmp.Tcp.InCsumErrors = &value
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}
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case "Udp":
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switch key {
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case "InDatagrams":
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procSnmp.Udp.InDatagrams = &value
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case "NoPorts":
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procSnmp.Udp.NoPorts = &value
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case "InErrors":
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procSnmp.Udp.InErrors = &value
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case "OutDatagrams":
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procSnmp.Udp.OutDatagrams = &value
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case "RcvbufErrors":
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procSnmp.Udp.RcvbufErrors = &value
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case "SndbufErrors":
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procSnmp.Udp.SndbufErrors = &value
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case "InCsumErrors":
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procSnmp.Udp.InCsumErrors = &value
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case "IgnoredMulti":
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procSnmp.Udp.IgnoredMulti = &value
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}
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case "UdpLite":
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switch key {
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case "InDatagrams":
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procSnmp.UdpLite.InDatagrams = &value
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case "NoPorts":
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procSnmp.UdpLite.NoPorts = &value
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case "InErrors":
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procSnmp.UdpLite.InErrors = &value
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case "OutDatagrams":
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procSnmp.UdpLite.OutDatagrams = &value
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case "RcvbufErrors":
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procSnmp.UdpLite.RcvbufErrors = &value
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case "SndbufErrors":
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procSnmp.UdpLite.SndbufErrors = &value
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case "InCsumErrors":
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procSnmp.UdpLite.InCsumErrors = &value
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case "IgnoredMulti":
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procSnmp.UdpLite.IgnoredMulti = &value
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}
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}
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}
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}
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return procSnmp, scanner.Err()
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}
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