| 1 | package host |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "crypto/sha256" |
| 6 | "encoding/hex" |
| 7 | "encoding/json" |
| 8 | "errors" |
| 9 | "github.com/carlosframework/platform/internal/activator" |
| 10 | "github.com/carlosframework/platform/internal/provision" |
| 11 | "github.com/carlosframework/platform/internal/registry" |
| 12 | "os" |
| 13 | "strings" |
| 14 | ) |
| 15 | |
| 16 | func rootRecordRoute(rec *provision.Record) (registry.Route, error) { |
| 17 | if rec.Unit == "" { |
| 18 | return registry.Route{}, os.ErrPermission |
| 19 | } |
| 20 | rt := registry.Route{Host: rec.Host, Account: rec.Account, App: rec.App, Kind: rec.KindOrDefault(), Unit: rec.Unit, |
| 21 | Addr: rec.Addr, Addrs: strings.Join(rec.Addrs, ","), Channel: rec.Channel, Region: rec.Region, Pool: rec.Pool} |
| 22 | if rec.DerivesPaths() { |
| 23 | unit := activator.UnitName(rec.Host) |
| 24 | if rec.Unit != "" && rec.Unit != unit { |
| 25 | return registry.Route{}, os.ErrPermission |
| 26 | } |
| 27 | rt.Unit, rt.Socket, rt.Backing = unit, provision.DefaultSocket(rec.Host), registry.BackingUnit |
| 28 | } |
| 29 | if (rt.Unit != "" && !registry.ValidUnitName(rt.Unit)) || (rt.Kind != "instance" && rt.Kind != "service") { |
| 30 | return registry.Route{}, os.ErrPermission |
| 31 | } |
| 32 | if h := rec.HealthOrDefault(); h != nil { |
| 33 | body, err := json.Marshal(h.WithDefaults()) |
| 34 | if err != nil { |
| 35 | return registry.Route{}, err |
| 36 | } |
| 37 | rt.Health = string(body) |
| 38 | } |
| 39 | if rt.Socket == "" && len(rec.AddrsOrDefault()) == 0 { |
| 40 | return registry.Route{}, os.ErrPermission |
| 41 | } |
| 42 | |
| 43 | return rt, nil |
| 44 | } |
| 45 | |
| 46 | func sameProofCandidate(candidate, r registry.Route, declaredUnit string) bool { |
| 47 | return candidate.Account == r.Account && candidate.App == r.App && candidate.Host == r.Host && (candidate.Unit == declaredUnit || candidate.Unit == r.Unit) && candidate.Socket == r.Socket && candidate.Addr == r.Addr && candidate.Addrs == r.Addrs && candidate.Health == r.Health && candidate.Kind == r.Kind && candidate.Backing == r.Backing |
| 48 | } |
| 49 | func (s *proofBindingSource) needsRestart(ctx context.Context, candidate registry.Route) (bool, error) { |
| 50 | evidence, err := s.record(ctx, candidate.Host) |
| 51 | if err != nil { |
| 52 | if errors.Is(err, os.ErrNotExist) && candidate.Unit == "" { |
| 53 | return false, nil |
| 54 | } |
| 55 | return false, err |
| 56 | } |
| 57 | rec := evidence.record |
| 58 | if evidence.local { |
| 59 | _, err := s.forHost(ctx, candidate.Host) |
| 60 | return err == nil, err |
| 61 | } |
| 62 | if rec.Unit == "" { |
| 63 | return false, nil |
| 64 | } |
| 65 | if _, err := s.claimIdentity(ctx, rec); err != nil { |
| 66 | return false, err |
| 67 | } |
| 68 | rt, err := rootRecordRoute(rec) |
| 69 | if err != nil { |
| 70 | return false, err |
| 71 | } |
| 72 | if !sameProofCandidate(candidate, rt, rec.Unit) { |
| 73 | return false, os.ErrPermission |
| 74 | } |
| 75 | return rt.Unit != "", nil |
| 76 | } |
| 77 | |
| 78 | func (s *proofBindingSource) claimIdentity(ctx context.Context, rec *provision.Record) (string, error) { |
| 79 | if s.claim == nil && s.box == nil { |
| 80 | return "", nil |
| 81 | } |
| 82 | if s.claim == nil || s.box == nil { |
| 83 | return "", os.ErrPermission |
| 84 | } |
| 85 | box, err := s.box(ctx) |
| 86 | if err != nil { |
| 87 | return "", err |
| 88 | } |
| 89 | o, err := s.claim(ctx, rec.Host) |
| 90 | if err != nil { |
| 91 | return "", err |
| 92 | } |
| 93 | if o.Absent || o.ETag == "" || o.Host != rec.Host || o.Claim == nil || o.Claim.Host != rec.Host || o.Claim.Holder == nil { |
| 94 | return "", os.ErrPermission |
| 95 | } |
| 96 | h := o.Claim.Holder |
| 97 | if h.Key != provision.RecordKey(rec.Account, rec.App, rec.Host) || h.Account != rec.Account || h.App != rec.App || h.Incarnation == "" || h.Stamp == 0 || h.Session == 0 || box == "" || h.WriterBox != box || o.Claim.Op.Exec != box { |
| 98 | return "", os.ErrPermission |
| 99 | } |
| 100 | for _, lost := range o.Claim.Lost { |
| 101 | if lost == box { |
| 102 | return "", os.ErrPermission |
| 103 | } |
| 104 | } |
| 105 | b, err := json.Marshal(o.Claim) |
| 106 | if err != nil { |
| 107 | return "", err |
| 108 | } |
| 109 | sum := sha256.Sum256(b) |
| 110 | return o.ETag + "@" + hex.EncodeToString(sum[:]) + "@", nil |
| 111 | } |
| 112 | |
amadan