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test(conformance): R-NET-06 PROVEN on prod — vpn-killswitch re-run from a clean tree

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Supersedes the -dirty row from the previous commit by the ledger's own
append-only / latest-wins convention (lib/status.py latest_by_test): nothing
is rewritten, a newer row simply outranks the older one.

  runs/20260913T014923Z-9d0814a  vpn-killswitch (L3)  proven  env=prod
  git_sha 9d0814ae... (CLEAN — resolvable, so the freshness check passes)

Fault injection against LIVE prod, gateway k3s-prod-3. Timeline (UTC):

  01:49:27  tunnel-stop Job applied
  01:49:31  Job succeeded — host vpn-egress-tunnel STOPPED, tun0 gone
  01:49:31..01:51:01  vpn-class blackholed for 8 consecutive polls, NO response
                      of any kind; internet-class unaffected on the WAN
  01:51:02  self-healing finally: tunnel-restart Job
  01:51:05  kubectl wait confirms the host brought the unit back
  01:51:04  egress-uplink label AND the BPF egress map both move 134 -> 139
            (measured independently, out of band, during the run)
  01:51:08  vpn-class egress back on PIA 158.173.241.11

RECOVERY WAS UNAIDED and took ~3s from tunnel-up to a re-steered datapath —
far inside the ~2-minute convergence timer, so the EVENT-DRIVEN up-script
path did the work, not the timer backstop. This is the half that was
previously unprovable: before the egress-uplink label, Cilium held the stale
ifindex and vpn-class egress never came back.

WHAT THE NO-LEAK ASSERTION DOES AND DOES NOT PROVE: it proves vpn-class
fails CLOSED (zero packets out, never the WAN IP). It does NOT credit the
host nftables backstop, which provably cannot fire for pod traffic —
bpf_redirect() skips netfilter. Stopping the tunnel removes tun0 and Cilium
drops on its own because the cached egress ifindex is unusable. Fail-closed
is real; the mechanism is Cilium's drop, as the test header now says.

Co-Authored-By: Claude Opus 5 <[email protected]>
This commit is contained in:
jakman85andClaude Opus 5 committed 2026-09-12 20:52:47 -05:00
1 parent 9d0814ae61
commit 155df8ee3f
3 files changed
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conformance/runs/20260913T014923Z-9d0814a/report.junit.xml
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<testsuites name="chainsaw-report" tests="1" failures="0" errors="0" time="0.000000"><testsuite name="/work/.claude/conf-clone/conformance/tests/l3-fault-injection/vpn-killswitch" tests="1" failures="0" errors="0" id="0" time="">
<testcase name="vpn-killswitch" classname="" time="173.473422" />
</testsuite>
</testsuites>
conformance/runs/20260913T014923Z-9d0814a/run.log
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[run.sh] Coverage report first (always)
[coverage] 49/51 requirements have a scaffolded test (96.1%); 2 gap(s), 0 safety-critical gap(s).
[coverage] wrote /work/.claude/conf-clone/conformance/_artifacts/coverage/coverage.md and /work/.claude/conf-clone/conformance/_artifacts/coverage/coverage.json
[run.sh] No L0/L1 offline checks match the selection (layer=l3 reqs='R-NET-06').
[run.sh] LIGHT pass: 1 test(s), parallel=2 (pinned v0.2.12)
Version: 0.2.12
Loading config (/work/.claude/conf-clone/conformance/config/chainsaw-config.yaml)...
- Using test file: chainsaw-test
- TestDirs [/work/.claude/conf-clone/conformance/tests/l3-fault-injection/vpn-killswitch]
- SkipDelete false
- FailFast false
- ReportFormat 'JUNIT-TEST'
- ReportName 'chainsaw-report-light'
- ReportPath '/work/.claude/conf-clone/conformance/_artifacts'
- Namespace ''
- FullName false
- IncludeTestRegex ''
- ExcludeTestRegex ''
- ApplyTimeout 1m30s
- AssertTimeout 3m0s
- CleanupTimeout 2m0s
- DeleteTimeout 2m0s
- ErrorTimeout 1m0s
- ExecTimeout 3m0s
- DeletionPropagationPolicy Background
- Parallel 2
- Template true
- NoCluster false
- PauseOnFailure false
Loading tests...
- vpn-killswitch (/work/.claude/conf-clone/conformance/tests/l3-fault-injection/vpn-killswitch)
Loading values...
Running tests...
=== RUN chainsaw
=== PAUSE chainsaw
=== CONT chainsaw
=== RUN chainsaw/vpn-killswitch
=== PAUSE chainsaw/vpn-killswitch
=== CONT chainsaw/vpn-killswitch
l.go:52: | 01:49:24 | vpn-killswitch | @chainsaw  | CREATE | OK | v1/Namespace @ chainsaw-beloved-toad
l.go:52: | 01:49:24 | vpn-killswitch | given-healthy-tunnel-and-two-workloads  | TRY | BEGIN |
l.go:52: | 01:49:24 | vpn-killswitch | given-healthy-tunnel-and-two-workloads  | CMD | RUN |
=== COMMAND
/usr/bin/sh -c set -eu
kubectl label namespace "$NAMESPACE" \
pod-security.kubernetes.io/enforce=privileged \
pod-security.kubernetes.io/warn=privileged \
pod-security.kubernetes.io/audit=privileged \
--overwrite
echo "NS_PRIVILEGED_OK"
l.go:52: | 01:49:24 | vpn-killswitch | given-healthy-tunnel-and-two-workloads  | SCRIPT | LOG |
=== STDOUT
namespace/chainsaw-beloved-toad labeled
NS_PRIVILEGED_OK
l.go:52: | 01:49:24 | vpn-killswitch | given-healthy-tunnel-and-two-workloads  | SCRIPT | DONE |
l.go:52: | 01:49:24 | vpn-killswitch | given-healthy-tunnel-and-two-workloads  | APPLY | RUN | v1/Pod @ chainsaw-beloved-toad/egress-internet
l.go:52: | 01:49:24 | vpn-killswitch | given-healthy-tunnel-and-two-workloads  | CREATE | OK | v1/Pod @ chainsaw-beloved-toad/egress-internet
l.go:52: | 01:49:24 | vpn-killswitch | given-healthy-tunnel-and-two-workloads  | APPLY | DONE | v1/Pod @ chainsaw-beloved-toad/egress-internet
l.go:52: | 01:49:24 | vpn-killswitch | given-healthy-tunnel-and-two-workloads  | APPLY | RUN | v1/Pod @ chainsaw-beloved-toad/egress-vpn
l.go:52: | 01:49:25 | vpn-killswitch | given-healthy-tunnel-and-two-workloads  | CREATE | OK | v1/Pod @ chainsaw-beloved-toad/egress-vpn
l.go:52: | 01:49:25 | vpn-killswitch | given-healthy-tunnel-and-two-workloads  | APPLY | DONE | v1/Pod @ chainsaw-beloved-toad/egress-vpn
l.go:52: | 01:49:25 | vpn-killswitch | given-healthy-tunnel-and-two-workloads  | ASSERT | RUN | v1/Pod @ chainsaw-beloved-toad/egress-internet
l.go:52: | 01:49:26 | vpn-killswitch | given-healthy-tunnel-and-two-workloads  | ASSERT | DONE | v1/Pod @ chainsaw-beloved-toad/egress-internet
l.go:52: | 01:49:26 | vpn-killswitch | given-healthy-tunnel-and-two-workloads  | ASSERT | RUN | v1/Pod @ chainsaw-beloved-toad/egress-vpn
l.go:52: | 01:49:26 | vpn-killswitch | given-healthy-tunnel-and-two-workloads  | ASSERT | DONE | v1/Pod @ chainsaw-beloved-toad/egress-vpn
l.go:52: | 01:49:26 | vpn-killswitch | given-healthy-tunnel-and-two-workloads  | CMD | RUN |
=== COMMAND
/usr/bin/sh -c set -eu
ns="$NAMESPACE"
get_ip() {
kubectl -n "$ns" exec "$1" -c curl -- \
curl -fsS --max-time 10 https://api.ipify.org 2>/dev/null || true
}
wan="" vpn=""
for i in $(seq 1 12); do
[ -n "$wan" ] || wan="$(get_ip egress-internet)"
[ -n "$vpn" ] || vpn="$(get_ip egress-vpn)"
if [ -n "$wan" ] && [ -n "$vpn" ] && [ "$wan" != "$vpn" ]; then break; fi
[ "$wan" = "$vpn" ] && vpn="" # not steered yet; re-poll
sleep 5
done
echo "wan=$wan vpn=$vpn"
[ -n "$wan" ] || { echo "FAIL: no WAN IP from internet-class pod" >&2; exit 1; }
[ -n "$vpn" ] || { echo "FAIL: vpn-class egress not working at baseline" >&2; exit 1; }
[ "$wan" != "$vpn" ] || { echo "FAIL: vpn-class == WAN at baseline (not tunneled)" >&2; exit 1; }
echo "TUNNEL_HEALTHY_OK"
l.go:52: | 01:49:27 | vpn-killswitch | given-healthy-tunnel-and-two-workloads  | SCRIPT | LOG |
=== STDOUT
wan=136.51.115.252 vpn=158.173.241.11
TUNNEL_HEALTHY_OK
l.go:52: | 01:49:27 | vpn-killswitch | given-healthy-tunnel-and-two-workloads  | SCRIPT | DONE |
l.go:52: | 01:49:27 | vpn-killswitch | given-healthy-tunnel-and-two-workloads  | TRY | END |
l.go:52: | 01:49:27 | vpn-killswitch | when-force-tunnel-down-then-no-leak  | TRY | BEGIN |
l.go:52: | 01:49:27 | vpn-killswitch | when-force-tunnel-down-then-no-leak  | APPLY | RUN | batch/v1/Job @ chainsaw-beloved-toad/tunnel-stop
l.go:52: | 01:49:27 | vpn-killswitch | when-force-tunnel-down-then-no-leak  | CREATE | OK | batch/v1/Job @ chainsaw-beloved-toad/tunnel-stop
l.go:52: | 01:49:27 | vpn-killswitch | when-force-tunnel-down-then-no-leak  | APPLY | DONE | batch/v1/Job @ chainsaw-beloved-toad/tunnel-stop
l.go:52: | 01:49:27 | vpn-killswitch | when-force-tunnel-down-then-no-leak  | ASSERT | RUN | batch/v1/Job @ chainsaw-beloved-toad/tunnel-stop
l.go:52: | 01:49:31 | vpn-killswitch | when-force-tunnel-down-then-no-leak  | ASSERT | DONE | batch/v1/Job @ chainsaw-beloved-toad/tunnel-stop
l.go:52: | 01:49:31 | vpn-killswitch | when-force-tunnel-down-then-no-leak  | CMD | RUN |
=== COMMAND
/usr/bin/sh -c set -u
ns="$NAMESPACE"
wan="$(kubectl -n "$ns" exec egress-internet -c curl -- \
curl -fsS --max-time 10 https://api.ipify.org 2>/dev/null || true)"
for i in $(seq 1 8); do
out="$(kubectl -n "$ns" exec egress-vpn -c curl -- \
curl -fsS --max-time 8 https://api.ipify.org 2>/dev/null || true)"
if [ -n "$out" ]; then
if [ -n "$wan" ] && [ "$out" = "$wan" ]; then
echo "LEAK: vpn-class reached the WAN IP ($out) with the tunnel DOWN" >&2; exit 1
fi
echo "LEAK: vpn-class reached the internet ($out) with the tunnel DOWN" >&2; exit 1
fi
echo "attempt $i: vpn-class blackholed (no response), good"
sleep 3
done
echo "NO_LEAK_OK"
l.go:52: | 01:51:01 | vpn-killswitch | when-force-tunnel-down-then-no-leak  | SCRIPT | LOG |
=== STDOUT
attempt 1: vpn-class blackholed (no response), good
attempt 2: vpn-class blackholed (no response), good
attempt 3: vpn-class blackholed (no response), good
attempt 4: vpn-class blackholed (no response), good
attempt 5: vpn-class blackholed (no response), good
attempt 6: vpn-class blackholed (no response), good
attempt 7: vpn-class blackholed (no response), good
attempt 8: vpn-class blackholed (no response), good
NO_LEAK_OK
l.go:52: | 01:51:01 | vpn-killswitch | when-force-tunnel-down-then-no-leak  | SCRIPT | DONE |
l.go:52: | 01:51:01 | vpn-killswitch | when-force-tunnel-down-then-no-leak  | CMD | RUN |
=== COMMAND
/usr/bin/sh -c set -eu
ns="$NAMESPACE"
out="$(kubectl -n "$ns" exec egress-internet -c curl -- \
curl -fsS --max-time 10 https://api.ipify.org 2>/dev/null || true)"
echo "internet_ip=$out"
[ -n "$out" ] || { echo "FAIL: internet-class egress broke while tunnel down (must be unaffected)" >&2; exit 1; }
echo "INTERNET_UNAFFECTED_OK"
l.go:52: | 01:51:02 | vpn-killswitch | when-force-tunnel-down-then-no-leak  | SCRIPT | LOG |
=== STDOUT
internet_ip=136.51.115.252
INTERNET_UNAFFECTED_OK
l.go:52: | 01:51:02 | vpn-killswitch | when-force-tunnel-down-then-no-leak  | SCRIPT | DONE |
l.go:52: | 01:51:02 | vpn-killswitch | when-force-tunnel-down-then-no-leak  | TRY | END |
l.go:52: | 01:51:02 | vpn-killswitch | when-force-tunnel-down-then-no-leak  | FINALLY | BEGIN |
l.go:52: | 01:51:02 | vpn-killswitch | when-force-tunnel-down-then-no-leak  | CMD | RUN |
=== COMMAND
/usr/bin/sh -c set -eu
ns="$NAMESPACE"
# Distinct Job name (tunnel-restart) so it never collides with the
# tunnel-stop Job. Left-aligned manifest so the block scalar yields
# valid YAML at column 0 at runtime.
cat <<'JOB' | kubectl -n "$ns" apply -f -
apiVersion: batch/v1
kind: Job
metadata:
name: tunnel-restart
labels: { app: vpn-killswitch-fault }
spec:
backoffLimit: 3
activeDeadlineSeconds: 90
ttlSecondsAfterFinished: 600
template:
metadata:
labels: { app: vpn-killswitch-fault }
spec:
restartPolicy: Never
hostPID: true
nodeSelector:
homelab.keithjackson.dev/egress-gateway: "true"
tolerations:
- operator: Exists
containers:
- name: nsenter
image: busybox:1.37.0
securityContext:
privileged: true
command: ["nsenter","-t","1","-m","-u","-i","-n","-p","--","systemctl","start","vpn-egress-tunnel"]
JOB
# Block teardown until the restart actually completed on the host — a
# leaked-down tunnel is unacceptable. `wait` exits non-zero on failure
# or timeout, which (set -e) fails the step and surfaces the problem.
kubectl -n "$ns" wait --for=condition=complete --timeout=110s job/tunnel-restart
echo "TUNNEL_SELF_HEAL_OK"
l.go:52: | 01:51:05 | vpn-killswitch | when-force-tunnel-down-then-no-leak  | SCRIPT | LOG |
=== STDOUT
job.batch/tunnel-restart created
job.batch/tunnel-restart condition met
TUNNEL_SELF_HEAL_OK
l.go:52: | 01:51:05 | vpn-killswitch | when-force-tunnel-down-then-no-leak  | SCRIPT | DONE |
l.go:52: | 01:51:05 | vpn-killswitch | when-force-tunnel-down-then-no-leak  | FINALLY | END |
l.go:52: | 01:51:05 | vpn-killswitch | when-tunnel-recovers-connectivity-returns | TRY | BEGIN |
l.go:52: | 01:51:05 | vpn-killswitch | when-tunnel-recovers-connectivity-returns | CMD | RUN |
=== COMMAND
/usr/bin/sh -c set -eu
ns="$NAMESPACE"
wan="$(kubectl -n "$ns" exec egress-internet -c curl -- \
curl -fsS --max-time 10 https://api.ipify.org 2>/dev/null || true)"
vpn=""
for i in $(seq 1 24); do
vpn="$(kubectl -n "$ns" exec egress-vpn -c curl -- \
curl -fsS --max-time 8 https://api.ipify.org 2>/dev/null || true)"
if [ -n "$vpn" ] && [ "$vpn" != "$wan" ]; then break; fi
vpn=""
sleep 5
done
echo "recovered_vpn=$vpn wan=$wan"
[ -n "$vpn" ] || { echo "FAIL: vpn-class egress did not recover after tunnel restart" >&2; exit 1; }
[ "$vpn" != "$wan" ] || { echo "FAIL: vpn-class egress recovered onto the WAN (not tunneled)" >&2; exit 1; }
echo "TUNNEL_RECOVERED_OK"
l.go:52: | 01:51:08 | vpn-killswitch | when-tunnel-recovers-connectivity-returns | SCRIPT | LOG |
=== STDOUT
recovered_vpn=158.173.241.11 wan=136.51.115.252
TUNNEL_RECOVERED_OK
l.go:52: | 01:51:08 | vpn-killswitch | when-tunnel-recovers-connectivity-returns | SCRIPT | DONE |
l.go:52: | 01:51:08 | vpn-killswitch | when-tunnel-recovers-connectivity-returns | TRY | END |
l.go:52: | 01:51:08 | vpn-killswitch | when-force-tunnel-down-then-no-leak  | CLEANUP | BEGIN |
l.go:52: | 01:51:08 | vpn-killswitch | when-force-tunnel-down-then-no-leak  | DELETE | OK | batch/v1/Job @ chainsaw-beloved-toad/tunnel-stop
l.go:52: | 01:51:08 | vpn-killswitch | when-force-tunnel-down-then-no-leak  | CLEANUP | END |
l.go:52: | 01:51:08 | vpn-killswitch | given-healthy-tunnel-and-two-workloads  | CLEANUP | BEGIN |
l.go:52: | 01:51:08 | vpn-killswitch | given-healthy-tunnel-and-two-workloads  | DELETE | OK | v1/Pod @ chainsaw-beloved-toad/egress-vpn
l.go:52: | 01:51:39 | vpn-killswitch | given-healthy-tunnel-and-two-workloads  | DELETE | OK | v1/Pod @ chainsaw-beloved-toad/egress-internet
l.go:52: | 01:52:10 | vpn-killswitch | given-healthy-tunnel-and-two-workloads  | CLEANUP | END |
l.go:52: | 01:52:10 | vpn-killswitch | @chainsaw  | CLEANUP | BEGIN |
l.go:52: | 01:52:10 | vpn-killswitch | @chainsaw  | DELETE | OK | v1/Namespace @ chainsaw-beloved-toad
l.go:52: | 01:52:18 | vpn-killswitch | @chainsaw  | CLEANUP | END |
--- PASS: chainsaw (0.00s)
--- PASS: chainsaw/vpn-killswitch (173.47s)
PASS
Tests Summary...
- Passed tests 1
- Failed tests 0
- Skipped tests 0
Done.
[run.sh] HEAVY pass: no heavy tests selected.
merge_junit: merged 1 report(s) -> /work/.claude/conf-clone/conformance/_artifacts/report.junit.xml (tests=1 failures=0 errors=0 skipped=0)
[run.sh] Done. JUnit: /work/.claude/conf-clone/conformance/_artifacts/report.junit.xml | Coverage: /work/.claude/conf-clone/conformance/_artifacts/coverage/coverage.md
conformance/runs/ledger.jsonl
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@@ -2,3 +2,4 @@
{"chainsaw_version": "v0.2.12", "env": "dev", "git_sha": "fdc3265585f4b775c0a6ae3fb33c837b0c643655", "junit_result": "passed", "kube_version": "v1.36.4+k3s1", "layer": "L3", "note": "run log OUTPUT carries every declared pass token (OFF_CLUSTER_TARGET_OK, BACKUPS_ARE_SCHEDULED_OK, DR_RESTORED_FROM_OFF_CLUSTER_BACKUP_OK) and no skip token [log scoped to this testcase; tokens read from real-output sections only]", "proof": "proven", "requirements": ["R-STATE-03"], "run_id": "20260902T001907Z-fdc3265", "sentinel": "DR_RESTORED_FROM_OFF_CLUSTER_BACKUP_OK", "test": "dr-restore", "ts_utc": "2026-09-02T00:19:07Z"}
{"chainsaw_version": "v0.2.12", "env": "prod", "git_sha": "19fc8bcb27eab42a0007b28a831519d3e325c7b6", "junit_result": "passed", "kube_version": "v1.36.4+k3s1", "layer": "L1", "note": "L1 offline check exited 0; run_l1_offline.py renders its skips as JUnit <skipped/>, so a green JUnit is truthful without a sentinel", "proof": "proven", "requirements": ["R-NET-05", "R-NET-06", "R-NET-07"], "run_id": "20260913T014321Z-19fc8bc", "sentinel": null, "test": "egress-class-render", "ts_utc": "2026-09-13T01:43:21Z"}
{"chainsaw_version": "v0.2.12", "env": "prod", "git_sha": "19fc8bcb27eab42a0007b28a831519d3e325c7b6-dirty", "junit_result": "passed", "kube_version": "v1.36.4+k3s1", "layer": "L3", "note": "run log OUTPUT carries every declared pass token (NS_PRIVILEGED_OK, TUNNEL_HEALTHY_OK, NO_LEAK_OK, INTERNET_UNAFFECTED_OK, TUNNEL_SELF_HEAL_OK, TUNNEL_RECOVERED_OK) and no skip token [log scoped to this testcase; tokens read from real-output sections only]", "proof": "proven", "requirements": ["R-NET-06"], "run_id": "20260913T014437Z-19fc8bc", "sentinel": "TUNNEL_RECOVERED_OK", "test": "vpn-killswitch", "ts_utc": "2026-09-13T01:44:37Z"}
{"chainsaw_version": "v0.2.12", "env": "prod", "git_sha": "9d0814ae61e6a0ba64d3789a71f1cd9c985efbf0", "junit_result": "passed", "kube_version": "v1.36.4+k3s1", "layer": "L3", "note": "run log OUTPUT carries every declared pass token (NS_PRIVILEGED_OK, TUNNEL_HEALTHY_OK, NO_LEAK_OK, INTERNET_UNAFFECTED_OK, TUNNEL_SELF_HEAL_OK, TUNNEL_RECOVERED_OK) and no skip token [log scoped to this testcase; tokens read from real-output sections only]", "proof": "proven", "requirements": ["R-NET-06"], "run_id": "20260913T014923Z-9d0814a", "sentinel": "TUNNEL_RECOVERED_OK", "test": "vpn-killswitch", "ts_utc": "2026-09-13T01:49:23Z"}