| 1 | package hostactors |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "crypto/rand" |
| 6 | "encoding/hex" |
| 7 | "encoding/json" |
| 8 | "errors" |
| 9 | "os" |
| 10 | "strings" |
| 11 | |
| 12 | "github.com/carlosframework/platform/internal/boxid" |
| 13 | "github.com/carlosframework/platform/internal/hostfloor" |
| 14 | "github.com/carlosframework/platform/internal/release" |
| 15 | ) |
| 16 | |
| 17 | type Invitation struct { |
| 18 | V int `json:"v"` |
| 19 | Bucket string `json:"bucket"` |
| 20 | Reference string `json:"reference"` |
| 21 | Enrollment string `json:"enrollment"` |
| 22 | EvidenceSHA256 string `json:"evidence_sha256"` |
| 23 | } |
| 24 | |
| 25 | // Invite grants no membership. It gives an enrolled-identity candidate a |
| 26 | // stable nonce with which to install its root guard and publish readiness. |
| 27 | // A fleet caller passes an empty reference, then changes only boxid.Record.Box |
| 28 | // to the returned Reference and marshals it again before publishing or Enroll. |
| 29 | // That field is outside the AWS-signed identity document and signature. |
| 30 | func (d Directory) Invite(ctx context.Context, sg release.Signer, reference string, evidence []byte) (Invitation, error) { |
| 31 | fleet := reference == "" |
| 32 | if !fleet && !segment(reference) { |
| 33 | return Invitation{}, ErrRoster |
| 34 | } |
| 35 | if !fleet { |
| 36 | key := "control/host-actor-invitations/" + reference + ".json" |
| 37 | raw, _, err := d.Store.Get(ctx, key) |
| 38 | if err == nil { |
| 39 | var invite Invitation |
| 40 | if release.VerifyRootEnvelope(d.PublicKey, raw, &invite) != nil || invite.V != 1 || invite.Bucket != d.Bucket || invite.Reference != reference || !token.MatchString(invite.Enrollment) || invite.EvidenceSHA256 != hostfloor.Digest(evidence) || (strings.HasPrefix(reference, "fleet-") && reference != "fleet-"+invite.Enrollment) { |
| 41 | return Invitation{}, ErrRoster |
| 42 | } |
| 43 | return invite, nil |
| 44 | } |
| 45 | if !errors.Is(err, os.ErrNotExist) { |
| 46 | return Invitation{}, err |
| 47 | } |
| 48 | // Fleet references are minted from their enrollment nonce. A caller may |
| 49 | // retry one returned by this function, but cannot choose a fresh one. |
| 50 | if strings.HasPrefix(reference, "fleet-") { |
| 51 | return Invitation{}, ErrRoster |
| 52 | } |
| 53 | } |
| 54 | var id [16]byte |
| 55 | if _, err := rand.Read(id[:]); err != nil { |
| 56 | return Invitation{}, err |
| 57 | } |
| 58 | enrollment := hex.EncodeToString(id[:]) |
| 59 | if fleet { |
| 60 | reference = "fleet-" + enrollment |
| 61 | var rec boxid.Record |
| 62 | if json.Unmarshal(evidence, &rec) != nil || rec.V != 1 { |
| 63 | return Invitation{}, ErrRoster |
| 64 | } |
| 65 | rec.Box = reference |
| 66 | var err error |
| 67 | evidence, err = json.Marshal(rec) |
| 68 | if err != nil { |
| 69 | return Invitation{}, err |
| 70 | } |
| 71 | } |
| 72 | invite := Invitation{1, d.Bucket, reference, enrollment, hostfloor.Digest(evidence)} |
| 73 | raw, err := release.SignRootEnvelope(sg, invite) |
| 74 | if err != nil { |
| 75 | return Invitation{}, err |
| 76 | } |
| 77 | key := "control/host-actor-invitations/" + reference + ".json" |
| 78 | if _, err = d.Store.Put(ctx, key, raw, ""); err != nil { |
| 79 | return Invitation{}, err |
| 80 | } |
| 81 | return invite, nil |
| 82 | } |
| 83 | func (d Directory) enrollmentNonce(ctx context.Context, in EnrollmentRequest, evidence []byte) (string, error) { |
| 84 | key := "control/host-actor-invitations/" + in.Reference + ".json" |
| 85 | raw, _, err := d.Store.Get(ctx, key) |
| 86 | if err != nil { |
| 87 | return "", err |
| 88 | } |
| 89 | var invite Invitation |
| 90 | if release.VerifyRootEnvelope(d.PublicKey, raw, &invite) != nil || invite.V != 1 || invite.Bucket != d.Bucket || invite.Reference != in.Reference || !token.MatchString(invite.Enrollment) || ((strings.HasPrefix(in.Namespace, "fleet:") || strings.HasPrefix(in.Reference, "fleet-")) && in.Reference != "fleet-"+invite.Enrollment) || invite.EvidenceSHA256 != hostfloor.Digest(evidence) { |
| 91 | return "", ErrRoster |
| 92 | } |
| 93 | return invite.Enrollment, nil |
| 94 | } |
| 95 | |
amadan