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100 lines
2.8 KiB
Go
100 lines
2.8 KiB
Go
package workspaceapps
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import (
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"encoding/json"
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"time"
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"github.com/google/uuid"
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"golang.org/x/xerrors"
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"gopkg.in/square/go-jose.v2"
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)
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const ticketSigningAlgorithm = jose.HS512
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// Ticket is the struct data contained inside a workspace app ticket JWE. It
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// contains the details of the workspace app that the ticket is valid for to
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// avoid database queries.
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//
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// The JSON field names are short to reduce the size of the ticket.
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type Ticket struct {
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// Request details.
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Request `json:"request"`
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// Trusted resolved details.
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Expiry int64 `json:"expiry"` // set by GenerateTicket if unset
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UserID uuid.UUID `json:"user_id"`
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WorkspaceID uuid.UUID `json:"workspace_id"`
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AgentID uuid.UUID `json:"agent_id"`
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AppURL string `json:"app_url"`
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}
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func (t Ticket) MatchesRequest(req Request) bool {
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return t.AccessMethod == req.AccessMethod &&
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t.BasePath == req.BasePath &&
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t.UsernameOrID == req.UsernameOrID &&
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t.WorkspaceNameOrID == req.WorkspaceNameOrID &&
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t.AgentNameOrID == req.AgentNameOrID &&
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t.AppSlugOrPort == req.AppSlugOrPort
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}
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func (p *Provider) GenerateTicket(payload Ticket) (string, error) {
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if payload.Expiry == 0 {
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payload.Expiry = time.Now().Add(TicketExpiry).Unix()
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}
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payloadBytes, err := json.Marshal(payload)
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if err != nil {
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return "", xerrors.Errorf("marshal payload to JSON: %w", err)
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}
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// We use symmetric signing with an RSA key to support satellites in the
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// future.
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signer, err := jose.NewSigner(jose.SigningKey{
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Algorithm: ticketSigningAlgorithm,
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Key: p.TicketSigningKey,
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}, nil)
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if err != nil {
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return "", xerrors.Errorf("create signer: %w", err)
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}
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signedObject, err := signer.Sign(payloadBytes)
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if err != nil {
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return "", xerrors.Errorf("sign payload: %w", err)
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}
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serialized, err := signedObject.CompactSerialize()
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if err != nil {
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return "", xerrors.Errorf("serialize JWS: %w", err)
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}
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return serialized, nil
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}
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func (p *Provider) ParseTicket(ticketStr string) (Ticket, error) {
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object, err := jose.ParseSigned(ticketStr)
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if err != nil {
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return Ticket{}, xerrors.Errorf("parse JWS: %w", err)
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}
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if len(object.Signatures) != 1 {
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return Ticket{}, xerrors.New("expected 1 signature")
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}
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if object.Signatures[0].Header.Algorithm != string(ticketSigningAlgorithm) {
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return Ticket{}, xerrors.Errorf("expected ticket signing algorithm to be %q, got %q", ticketSigningAlgorithm, object.Signatures[0].Header.Algorithm)
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}
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output, err := object.Verify(p.TicketSigningKey)
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if err != nil {
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return Ticket{}, xerrors.Errorf("verify JWS: %w", err)
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}
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var ticket Ticket
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err = json.Unmarshal(output, &ticket)
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if err != nil {
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return Ticket{}, xerrors.Errorf("unmarshal payload: %w", err)
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}
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if ticket.Expiry < time.Now().Unix() {
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return Ticket{}, xerrors.New("ticket expired")
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}
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return ticket, nil
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}
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