| 1 | package hostguard |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "errors" |
| 6 | ) |
| 7 | |
| 8 | type MigrationDeny struct { |
| 9 | Incarnation string |
| 10 | Stamp, Session uint64 |
| 11 | } |
| 12 | |
| 13 | func migrationDenied(denies []MigrationDeny, c Captured, session uint64) bool { |
| 14 | for _, d := range denies { |
| 15 | if d.Incarnation == c.Incarnation && c.Stamp <= d.Stamp && session <= d.Session { |
| 16 | return true |
| 17 | } |
| 18 | } |
| 19 | return false |
| 20 | } |
| 21 | |
| 22 | // RetainMigrationDeny adds only refusal authority. The offline root collector |
| 23 | // supplies the independently observed installation; this method grants no work. |
| 24 | func (a *RootAuthority) RetainMigrationDeny(ctx context.Context, in RootInstallation, session uint64) error { |
| 25 | if a == nil || a.store == nil || validateFileHost(in.Host) != nil || in.Incarnation == "" || in.Stamp == 0 || in.Migration == 0 || in.Account == "" || in.App == "" || in.Record == "" || in.Box == "" || in.Enrollment == "" || session == 0 { |
| 26 | return ErrInvalidInput |
| 27 | } |
| 28 | unlock, err := a.store.Lock(ctx, in.Host+".lock") |
| 29 | if err != nil { |
| 30 | return err |
| 31 | } |
| 32 | defer unlock() |
| 33 | r, err := a.read(in.Host) |
| 34 | if errors.Is(err, ErrNoRecord) { |
| 35 | r = record{V: 1, Host: in.Host, Incarnation: in.Incarnation, ActiveStamp: in.Stamp, root: true, installation: in} |
| 36 | } else if err != nil { |
| 37 | return err |
| 38 | } |
| 39 | if r.installation.Host != in.Host || r.installation.Incarnation != in.Incarnation || r.installation.Stamp != in.Stamp || r.installation.Account != in.Account || r.installation.App != in.App || r.installation.Record != in.Record || r.installation.Box != in.Box || r.installation.Enrollment != in.Enrollment || r.installation.Migration != in.Migration { |
| 40 | return ErrRecordIncarnation |
| 41 | } |
| 42 | for i, d := range r.migrationDenies { |
| 43 | if d.Incarnation == in.Incarnation && d.Stamp == in.Stamp { |
| 44 | if session > r.migrationDenies[i].Session { |
| 45 | r.migrationDenies[i].Session = session |
| 46 | } |
| 47 | return a.write(r) |
| 48 | } |
| 49 | } |
| 50 | r.migrationDenies = append(r.migrationDenies, MigrationDeny{Incarnation: in.Incarnation, Stamp: in.Stamp, Session: session}) |
| 51 | return a.write(r) |
| 52 | } |
| 53 | |
| 54 | // CompleteMigrationInventory binds the checked inventory only after root has |
| 55 | // retained its own completed stop receipt for this denied session. |
| 56 | func (a *RootAuthority) CompleteMigrationInventory(ctx context.Context, target FenceTarget, revision uint64, artifacts InstallationArtifacts, previous ...uint64) error { |
| 57 | if target.validate(target.Host) != nil || revision == 0 || artifacts.Schema != 1 { |
| 58 | return ErrInvalidInput |
| 59 | } |
| 60 | unlock, err := a.store.Lock(ctx, target.Host+".lock") |
| 61 | if err != nil { |
| 62 | return err |
| 63 | } |
| 64 | defer unlock() |
| 65 | r, err := a.read(target.Host) |
| 66 | if err != nil { |
| 67 | return err |
| 68 | } |
| 69 | captured := Captured{Incarnation: target.Incarnation, Stamp: target.Stamp} |
| 70 | if r.Incarnation != target.Incarnation || r.ActiveStamp != target.Stamp || !migrationDenied(r.migrationDenies, captured, target.Session) { |
| 71 | return ErrFenceTarget |
| 72 | } |
| 73 | completed := false |
| 74 | for _, receipt := range r.FenceJournal { |
| 75 | if receipt.Target == target { |
| 76 | completed = true |
| 77 | } |
| 78 | } |
| 79 | prior := revision |
| 80 | if len(previous) > 1 || len(previous) == 1 && (previous[0] == 0 || previous[0] == ^uint64(0) || previous[0]+1 != revision) { |
| 81 | return ErrInvalidInput |
| 82 | } |
| 83 | if len(previous) == 1 { |
| 84 | prior = previous[0] |
| 85 | } |
| 86 | if !completed || r.installation.InventoryRevision != 0 && r.installation.InventoryRevision != revision && r.installation.InventoryRevision != prior { |
| 87 | return ErrFenceTarget |
| 88 | } |
| 89 | r.installation.InventoryRevision = revision |
| 90 | r.installation.Artifacts = artifacts |
| 91 | return a.write(r) |
| 92 | } |
| 93 | |
| 94 | func migrationAdmissionDenied(denies []MigrationDeny, receipts []FenceReceipt, c Captured, session uint64) bool { |
| 95 | if migrationDenied(denies, c, session) { |
| 96 | return true |
| 97 | } |
| 98 | for _, d := range denies { |
| 99 | if d.Incarnation != c.Incarnation || d.Stamp != c.Stamp { |
| 100 | continue |
| 101 | } |
| 102 | stopped := false |
| 103 | for _, r := range receipts { |
| 104 | if r.Target.Incarnation == d.Incarnation && r.Target.Stamp == d.Stamp && r.Target.Session == d.Session { |
| 105 | stopped = true |
| 106 | } |
| 107 | } |
| 108 | if !stopped { |
| 109 | return true |
| 110 | } |
| 111 | } |
| 112 | return false |
| 113 | } |
| 114 | |
amadan