amadan

carlos / platform Public

hostclaim: a claim with no recorded origin head proves nothing (retained admissions are never evidence)

Answers Astra's P2 on 0b2cbf7b: before the first recorded admission,
Proven used to accept retained admissions, so an injected one proved an
origin. The chain starts empty for reads too; live origins come from
post-boundary admissions or the #250 files backfill. Astra's P3 (an
edited observation with recording off can erase the head) is accepted
under the targeted threat model: box credentials can already rewrite the
claim, and closing it costs a read per flag-off update.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Paul Campbell pushed by claude f043383899445e7bb9888280509b94fc61443bfc parent 0b2cbf7
2 files changed, +9 −11
  • internal/hostclaim/origins.go +5 −10
  • internal/hostclaim/plan15_origins_test.go +4 −1

CI passed — run details

CI log 
=== gate ===
cd launchctx && go vet ./... && go test ./... -count=1
ok  	amadan.net/carlos/platform.git/launchctx	0.011s
?   	amadan.net/carlos/platform.git/launchctx/controlname	[no test files]
?   	amadan.net/carlos/platform.git/launchctx/wireid	[no test files]
go vet ./...
gofmt -l .: clean
go test ./... -count=1 -timeout 30m
ok  	github.com/carlosframework/platform	332.484s
?   	github.com/carlosframework/platform/cmd/changelog	[no test files]
ok  	github.com/carlosframework/platform/cmd/console	3.127s
ok  	github.com/carlosframework/platform/cmd/moveprobe	93.290s
ok  	github.com/carlosframework/platform/internal/activator	229.856s
ok  	github.com/carlosframework/platform/internal/agentsock	0.024s
ok  	github.com/carlosframework/platform/internal/alerting	0.007s
ok  	github.com/carlosframework/platform/internal/analytics	0.025s
ok  	github.com/carlosframework/platform/internal/appconfig	2.345s
ok  	github.com/carlosframework/platform/internal/apperr	0.104s
ok  	github.com/carlosframework/platform/internal/applog	0.178s
ok  	github.com/carlosframework/platform/internal/awsinv	0.010s
ok  	github.com/carlosframework/platform/internal/boxchoice	0.006s
ok  	github.com/carlosframework/platform/internal/boxid	0.577s
?   	github.com/carlosframework/platform/internal/boxid/boxidtest	[no test files]
?   	github.com/carlosframework/platform/internal/boxid/internal/signtest	[no test files]
ok  	github.com/carlosframework/platform/internal/boxvolumes	0.008s
ok  	github.com/carlosframework/platform/internal/caps	0.017s
ok  	github.com/carlosframework/platform/internal/certwarm	0.002s
ok  	github.com/carlosframework/platform/internal/cgroup	0.196s
ok  	github.com/carlosframework/platform/internal/changelog	0.283s
ok  	github.com/carlosframework/platform/internal/clamd	0.056s
?   	github.com/carlosframework/platform/internal/cliflag	[no test files]
ok  	github.com/carlosframework/platform/internal/console	360.889s
?   	github.com/carlosframework/platform/internal/controlname	[no test files]
?   	github.com/carlosframework/platform/internal/controlsock	[no test files]
ok  	github.com/carlosframework/platform/internal/dbdoor	5.788s
ok  	github.com/carlosframework/platform/internal/dbdoor/dbdoortest	0.009s
ok  	github.com/carlosframework/platform/internal/dbverify	0.006s
ok  	github.com/carlosframework/platform/internal/dnsrec	0.006s
ok  	github.com/carlosframework/platform/internal/docsite	0.006s
ok  	github.com/carlosframework/platform/internal/domains	2.014s
ok  	github.com/carlosframework/platform/internal/doorkey	0.006s
ok  	github.com/carlosframework/platform/internal/economics	0.006s
ok  	github.com/carlosframework/platform/internal/edge	25.905s
?   	github.com/carlosframework/platform/internal/edgeproof	[no test files]
ok  	github.com/carlosframework/platform/internal/edgesfile	0.006s
ok  	github.com/carlosframework/platform/internal/fleetapi	0.124s
ok  	github.com/carlosframework/platform/internal/gate	1.655s
ok  	github.com/carlosframework/platform/internal/genselect	0.015s
ok  	github.com/carlosframework/platform/internal/geo	0.016s
ok  	github.com/carlosframework/platform/internal/geoip	0.029s
ok  	github.com/carlosframework/platform/internal/host	61.994s
ok  	github.com/carlosframework/platform/internal/hostactors	0.432s
ok  	github.com/carlosframework/platform/internal/hostbox	1.240s
ok  	github.com/carlosframework/platform/internal/hostclaim	0.299s
ok  	github.com/carlosframework/platform/internal/hostevidence	0.007s
ok  	github.com/carlosframework/platform/internal/hostexec	0.307s
ok  	github.com/carlosframework/platform/internal/hostfence	0.035s
ok  	github.com/carlosframework/platform/internal/hostfiles	4.169s
ok  	github.com/carlosframework/platform/internal/hostfloor	0.008s
ok  	github.com/carlosframework/platform/internal/hostguard	0.132s
ok  	github.com/carlosframework/platform/internal/hostops	1.361s
?   	github.com/carlosframework/platform/internal/hostops/fencerelease	[no test files]
ok  	github.com/carlosframework/platform/internal/hostops/internal/fencerelease	0.007s
ok  	github.com/carlosframework/platform/internal/hostquarantine	0.007s
ok  	github.com/carlosframework/platform/internal/hostresolve	0.140s
ok  	github.com/carlosframework/platform/internal/hostwrite	0.008s
ok  	github.com/carlosframework/platform/internal/infraview	0.008s
ok  	github.com/carlosframework/platform/internal/instancectl	1.707s
ok  	github.com/carlosframework/platform/internal/instanceexec	2.708s
ok  	github.com/carlosframework/platform/internal/instancefs	0.008s
ok  	github.com/carlosframework/platform/internal/instancekey	0.010s
ok  	github.com/carlosframework/platform/internal/instanceupdates	0.013s
ok  	github.com/carlosframework/platform/internal/layout	1.379s
ok  	github.com/carlosframework/platform/internal/lease	9.443s
ok  	github.com/carlosframework/platform/internal/lease/leasetest	0.013s
ok  	github.com/carlosframework/platform/internal/ledger	0.019s
ok  	github.com/carlosframework/platform/internal/mail	0.154s
ok  	github.com/carlosframework/platform/internal/maintenance	0.076s
ok  	github.com/carlosframework/platform/internal/maintenanceexec	5.516s
ok  	github.com/carlosframework/platform/internal/maintenanceguard	0.074s
ok  	github.com/carlosframework/platform/internal/metrics	0.007s
ok  	github.com/carlosframework/platform/internal/moves	21.096s
ok  	github.com/carlosframework/platform/internal/moves/archive	0.744s
ok  	github.com/carlosframework/platform/internal/objstore	0.162s
ok  	github.com/carlosframework/platform/internal/ops	0.156s
ok  	github.com/carlosframework/platform/internal/park	0.199s
ok  	github.com/carlosframework/platform/internal/privatefile	0.006s
ok  	github.com/carlosframework/platform/internal/provision	3.243s
ok  	github.com/carlosframework/platform/internal/publicrelease	0.012s
?   	github.com/carlosframework/platform/internal/regionname	[no test files]
ok  	github.com/carlosframework/platform/internal/registry	3.896s
ok  	github.com/carlosframework/platform/internal/relay	7.226s
ok  	github.com/carlosframework/platform/internal/release	19.617s
ok  	github.com/carlosframework/platform/internal/rollout	3.248s
ok  	github.com/carlosframework/platform/internal/rolloutwords	0.004s
ok  	github.com/carlosframework/platform/internal/rootaws	0.007s
ok  	github.com/carlosframework/platform/internal/s3compat	0.005s
ok  	github.com/carlosframework/platform/internal/safefile	0.003s
ok  	github.com/carlosframework/platform/internal/schedule	2.251s
ok  	github.com/carlosframework/platform/internal/sim/hostlife	2.405s
ok  	github.com/carlosframework/platform/internal/sim/litestreamfacts	4.080s
ok  	github.com/carlosframework/platform/internal/status	0.041s
ok  	github.com/carlosframework/platform/internal/steering	0.005s
ok  	github.com/carlosframework/platform/internal/stopevidence	0.195s
ok  	github.com/carlosframework/platform/internal/svcrole	0.002s
ok  	github.com/carlosframework/platform/internal/telemetry	0.004s
ok  	github.com/carlosframework/platform/internal/termfence	0.004s
ok  	github.com/carlosframework/platform/internal/tunnelclient	0.003s
ok  	github.com/carlosframework/platform/internal/unixdial	0.003s
ok  	github.com/carlosframework/platform/internal/updatewords	0.003s
ok  	github.com/carlosframework/platform/internal/usage	0.004s
ok  	github.com/carlosframework/platform/internal/version	0.002s
ok  	github.com/carlosframework/platform/internal/vet	1.555s
=== cross ===
--- shard 0 of 5 ---
cross-compiling darwin/arm64
--- shard 1 of 5 ---
cross-compiling darwin/amd64
--- shard 2 of 5 ---
cross-compiling linux/arm64
--- shard 3 of 5 ---
cross-compiling windows/amd64
--- shard 4 of 5 ---
cross-compiling windows/arm64
=== minio-contract ===
minio contract: arm64, minio RELEASE.2025-09-07T16-13-09Z, mc RELEASE.2025-08-13T08-35-41Z
  minio: downloading https://github.com/minio/minio/releases/download/RELEASE.2025-09-07T16-13-09Z/minio.linux-arm64.RELEASE.2025-09-07T16-13-09Z
  minio: downloaded, digest verified
  mc: downloading https://github.com/minio/mc/releases/download/RELEASE.2025-08-13T08-35-41Z/mc.linux-arm64.RELEASE.2025-08-13T08-35-41Z
  mc: downloaded, digest verified
  minio healthy on 127.0.0.1:20999
Added `local` successfully.
Bucket created successfully `local/contract-bucket`.
Bucket created successfully `local/denied-bucket`.
Created policy `contract-only` successfully.
Added user `scopeduser` successfully.
Attached Policies: [contract-only]
To User: scopeduser
  buckets and scoped user ready
=== RUN   TestDeliveredContractMinio
=== RUN   TestDeliveredContractMinio/put
=== RUN   TestDeliveredContractMinio/get_round-trips_the_body
=== RUN   TestDeliveredContractMinio/list_shows_the_key
=== RUN   TestDeliveredContractMinio/head_and_list_agree_on_the_version
=== RUN   TestDeliveredContractMinio/the_app_cannot_tag_its_own_object
=== RUN   TestDeliveredContractMinio/the_app_cannot_tag_its_own_object/not_by_PutObjectTagging
=== RUN   TestDeliveredContractMinio/the_app_cannot_tag_its_own_object/and_not_by_x-amz-tagging_on_upload
=== RUN   TestDeliveredContractMinio/the_app_cannot_tag_by_any_other_route
=== RUN   TestDeliveredContractMinio/the_app_cannot_tag_by_any_other_route/not_by_CreateMultipartUpload
=== RUN   TestDeliveredContractMinio/the_app_cannot_tag_by_any_other_route/not_by_CopyObject_with_a_REPLACE_tagging_directive
=== RUN   TestDeliveredContractMinio/the_app_cannot_tag_by_any_other_route/but_multipart_itself_is_allowed
=== RUN   TestDeliveredContractMinio/the_app_cannot_tag_by_any_other_route/and_copy_itself_is_allowed
=== RUN   TestDeliveredContractMinio/the_app_cannot_tag_by_any_other_route/a_POST-policy_forged_tag_with_a_matching_version_is_still_not_a_verdict
=== RUN   TestDeliveredContractMinio/the_app_cannot_tag_by_any_other_route/and_an_ordinary_tagged-with-something-else_upload_is_allowed
=== RUN   TestDeliveredContractMinio/delete_removes_it
=== RUN   TestDeliveredContractMinio/cross-bucket_denial
--- PASS: TestDeliveredContractMinio (0.02s)
    --- PASS: TestDeliveredContractMinio/put (0.00s)
    --- PASS: TestDeliveredContractMinio/get_round-trips_the_body (0.00s)
    --- PASS: TestDeliveredContractMinio/list_shows_the_key (0.00s)
    --- PASS: TestDeliveredContractMinio/head_and_list_agree_on_the_version (0.00s)
    --- PASS: TestDeliveredContractMinio/the_app_cannot_tag_its_own_object (0.00s)
        --- PASS: TestDeliveredContractMinio/the_app_cannot_tag_its_own_object/not_by_PutObjectTagging (0.00s)
        --- PASS: TestDeliveredContractMinio/the_app_cannot_tag_its_own_object/and_not_by_x-amz-tagging_on_upload (0.00s)
    --- PASS: TestDeliveredContractMinio/the_app_cannot_tag_by_any_other_route (0.01s)
        --- PASS: TestDeliveredContractMinio/the_app_cannot_tag_by_any_other_route/not_by_CreateMultipartUpload (0.00s)
        --- PASS: TestDeliveredContractMinio/the_app_cannot_tag_by_any_other_route/not_by_CopyObject_with_a_REPLACE_tagging_directive (0.00s)
        --- PASS: TestDeliveredContractMinio/the_app_cannot_tag_by_any_other_route/but_multipart_itself_is_allowed (0.00s)
        --- PASS: TestDeliveredContractMinio/the_app_cannot_tag_by_any_other_route/and_copy_itself_is_allowed (0.00s)
        --- PASS: TestDeliveredContractMinio/the_app_cannot_tag_by_any_other_route/a_POST-policy_forged_tag_with_a_matching_version_is_still_not_a_verdict (0.00s)
        --- PASS: TestDeliveredContractMinio/the_app_cannot_tag_by_any_other_route/and_an_ordinary_tagged-with-something-else_upload_is_allowed (0.00s)
    --- PASS: TestDeliveredContractMinio/delete_removes_it (0.00s)
    --- PASS: TestDeliveredContractMinio/cross-bucket_denial (0.00s)
PASS
ok  	github.com/carlosframework/platform/internal/objstore	0.024s
=== RUN   TestT4StorageProbeMinio
2026/10/12 23:08:48 moves: T4: STORE: list: operation error S3: ListObjectsV2, https response error StatusCode: 403, RequestID: 18DDEAEC9D201334, HostID: 7c420053e0fbcd7f41653fdd92ffa2802c903d05303b1aa15adc2e8bb65d183f, api error SignatureDoesNotMatch: The request signature we calculated does not match the signature you provided. Check your key and signing method.
--- PASS: TestT4StorageProbeMinio (0.01s)
PASS
ok  	github.com/carlosframework/platform/internal/host	0.021s
minio contract: PASS
diff --git a/internal/hostclaim/origins.go b/internal/hostclaim/origins.go
index ca27c81df..c45b14f19 100644
--- a/internal/hostclaim/origins.go
+++ b/internal/hostclaim/origins.go
@@ -345,16 +345,11 @@ func (cache *OriginProofCache) Proven(ctx context.Context, obs Observed, set []O
}
invalidate()
c := fresh.Claim
- if c.Origins == nil {
- if h := c.Holder; h != nil {
- for _, a := range h.Admissions {
- tuple := OriginTuple{h.Incarnation, h.Location, a.Region, a.Generation}
- if _, ok := wanted[tuple]; ok {
- wanted[tuple] = true
- }
- }
- }
- } else {
+ // The chain starts empty: a claim with no recorded head proves nothing.
+ // Retained admissions are never evidence (a box can write them), so live
+ // origins are proven only through admissions recorded after the boundary
+ // or the #250 files backfill into an admitted prefix.
+ if c.Origins != nil {
remaining := len(wanted)
for head := *c.Origins; head.Count > 0 && remaining > 0; {
node, err := readOrigin(ctx, s, obs.Host, head)
diff --git a/internal/hostclaim/plan15_origins_test.go b/internal/hostclaim/plan15_origins_test.go
index f66474021..941d9cfe6 100644
--- a/internal/hostclaim/plan15_origins_test.go
+++ b/internal/hostclaim/plan15_origins_test.go
@@ -51,8 +51,11 @@ func TestPlan15PruningMigrationAndScope(t *testing.T) {
t.Fatal("fixture did not prune")
}
plan15Enable(t)
+ // The chain starts empty: before the first recorded admission, even a
+ // retained (and possibly injected) admission proves nothing.
plan15Proof(t, s, o, "old0", "ie", false)
- plan15Proof(t, s, o, "old4", "ie", true)
+ plan15Proof(t, s, o, "old4", "ie", false)
+ plan15Proof(t, s, o, "old11", "ie", false)
o = updateGenerationTest(t, t.Context(), s, o, plan15Admit(o, "first", "ie"))
for i := 0; i < 24; i++ {
o = updateGenerationTest(t, t.Context(), s, o, func(c *Claim) error {