| 1 | package hostresolve |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "encoding/json" |
| 6 | "github.com/carlosframework/platform/internal/hostactors" |
| 7 | "github.com/carlosframework/platform/internal/hostclaim" |
| 8 | "github.com/carlosframework/platform/internal/hostfloor" |
| 9 | "github.com/carlosframework/platform/internal/hostquarantine" |
| 10 | "reflect" |
| 11 | "slices" |
| 12 | "strings" |
| 13 | "time" |
| 14 | ) |
| 15 | |
| 16 | // Readmit keeps the global deny until every declaration, claim and receipt |
| 17 | // check is complete. It grants no executor or writer session. |
| 18 | func (s Service) Readmit(ctx context.Context, box, enrollment string, revision uint64, lossIDs []string) error { |
| 19 | before, err := s.Directory.Read(ctx) |
| 20 | if err != nil { |
| 21 | return err |
| 22 | } |
| 23 | b, ok := before.Roster.Boxes[box] |
| 24 | if !ok || b.Enrollment != enrollment || b.State != "quarantined" || b.QuarantineRevision != revision || !reflect.DeepEqual(b.LossIDs, lossIDs) { |
| 25 | return ErrResolve |
| 26 | } |
| 27 | fenced, err := s.Directory.TerminationFence(ctx, before, box, s.Now()) |
| 28 | if err != nil { |
| 29 | return err |
| 30 | } |
| 31 | if fenced { |
| 32 | return ErrResolve |
| 33 | } |
| 34 | report, err := s.Directory.PrivateBoxReport(ctx, box, b) |
| 35 | if err != nil { |
| 36 | return err |
| 37 | } |
| 38 | if report.Enrollment != enrollment || report.InstanceID != b.Cloud.InstanceID || report.BootID == "" || report.GeneratedAt.IsZero() || s.Now().Sub(report.GeneratedAt) > 15*time.Minute || report.GeneratedAt.After(s.Now().Add(5*time.Second)) { |
| 39 | return ErrResolve |
| 40 | } |
| 41 | floor, err := hostfloor.Read(ctx, s.Directory.Store, s.Directory.PublicKey, s.Directory.Bucket) |
| 42 | if err != nil { |
| 43 | return err |
| 44 | } |
| 45 | evidence := hostactors.ExactEvidence{PublicKey: s.Directory.PublicKey, Store: s.Directory.Store, Boxes: s.Directory.PrivateBoxReport} |
| 46 | if err = hostactors.VerifyReport(ctx, evidence, s.Directory.PublicKey, floor, report, enrollment, b.Cloud.InstanceID, s.Now()); err != nil { |
| 47 | return err |
| 48 | } |
| 49 | if !report.HostClaimEnabled { |
| 50 | return ErrResolve |
| 51 | } |
| 52 | key, err := hostquarantine.RetirementKey(box, enrollment, revision) |
| 53 | if err != nil { |
| 54 | return err |
| 55 | } |
| 56 | raw, _, err := s.Directory.Store.Get(ctx, key) |
| 57 | if err != nil { |
| 58 | return err |
| 59 | } |
| 60 | if report.RetirementReceiptSHA256 != hostfloor.Digest(raw) { |
| 61 | return ErrResolve |
| 62 | } |
| 63 | var receipt hostquarantine.RetirementCompletion |
| 64 | if json.Unmarshal(raw, &receipt) != nil || receipt.Validate() != nil || !receipt.Complete || receipt.Box != box || receipt.Enrollment != enrollment || receipt.InstanceID != b.Cloud.InstanceID || receipt.QuarantineRevision != revision || receipt.BootID != report.BootID || receipt.CompletedAt.After(report.GeneratedAt) { |
| 65 | return ErrResolve |
| 66 | } |
| 67 | losses := make(map[string][]hostclaim.LossRecord) |
| 68 | for _, id := range lossIDs { |
| 69 | loss, err := hostclaim.ReadLossRecord(ctx, s.Directory.Store, s.Directory.PublicKey, id) |
| 70 | if err != nil { |
| 71 | return err |
| 72 | } |
| 73 | if (loss.Record.State != "committed" && loss.Record.State != "conflicted") || loss.Record.Box != box || loss.Record.Enrollment != enrollment || loss.Record.QuarantineRevision > revision { |
| 74 | return ErrResolve |
| 75 | } |
| 76 | proven := false |
| 77 | for _, entry := range receipt.Entries { |
| 78 | if entry.Host == loss.Record.Host && entry.Incarnation == loss.Record.HolderIncarnation && entry.Stamp == loss.Record.HolderStamp { |
| 79 | proven = true |
| 80 | } |
| 81 | } |
| 82 | if !proven && (loss.Record.State == "conflicted" || len(loss.Record.ConfirmedConsequences.DischargeLocal) == 0) { |
| 83 | return ErrResolve |
| 84 | } |
| 85 | losses[loss.Record.Host] = append(losses[loss.Record.Host], loss.Record) |
| 86 | } |
| 87 | // Store.List is a complete listing in both real implementations. Its S3 |
| 88 | // implementation follows every continuation token; any error refuses. |
| 89 | keys, err := s.Directory.Store.List(ctx, "control/hosts/") |
| 90 | if err != nil { |
| 91 | return err |
| 92 | } |
| 93 | var claims []hostclaim.Observed |
| 94 | for _, key := range keys { |
| 95 | host, ok := claimHost(key) |
| 96 | if !ok { |
| 97 | continue |
| 98 | } |
| 99 | observed, err := hostclaim.Read(ctx, s.Directory.Store, host) |
| 100 | if err != nil { |
| 101 | return err |
| 102 | } |
| 103 | if observed.Absent { |
| 104 | continue |
| 105 | } |
| 106 | c := observed.Claim |
| 107 | for _, o := range c.Obligations { |
| 108 | if o.Kind == "park-local" && o.Box == box { |
| 109 | return ErrResolve |
| 110 | } |
| 111 | } |
| 112 | if slices.Contains(c.Lost, box) { |
| 113 | covered := false |
| 114 | for _, loss := range losses[host] { |
| 115 | if loss.State == "committed" && loss.QuarantineRevision == c.LostRevisions[box] && slices.Contains(c.LossRefs, loss.ID) { |
| 116 | covered = true |
| 117 | break |
| 118 | } |
| 119 | } |
| 120 | if !covered { |
| 121 | return ErrResolve |
| 122 | } |
| 123 | claims = append(claims, observed) |
| 124 | } |
| 125 | } |
| 126 | for _, observed := range claims { |
| 127 | if _, err = hostclaim.Update(ctx, s.Directory.Store, observed, hostclaim.Readmit(box, observed.Claim.LostRevisions[box])); err != nil { |
| 128 | return err |
| 129 | } |
| 130 | } |
| 131 | // CAS against the original roster prevents a concurrent declaration, |
| 132 | // reservation or membership change being overwritten by this readmission. |
| 133 | next := hostactors.Clone(before.Roster) |
| 134 | b.State = "active" |
| 135 | next.Boxes[box] = b |
| 136 | _, err = s.Directory.Replace(ctx, s.Signer, before, next) |
| 137 | return err |
| 138 | } |
| 139 | |
| 140 | func claimHost(key string) (string, bool) { |
| 141 | s, ok := strings.CutPrefix(key, "control/hosts/") |
| 142 | if !ok || strings.Contains(s, "/") { |
| 143 | return "", false |
| 144 | } |
| 145 | host, ok := strings.CutSuffix(s, ".json") |
| 146 | return host, ok && host != "" |
| 147 | } |
| 148 | |
amadan