/
token_exchange.go
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/
token_exchange.go
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package op
import (
"context"
"net/http"
"net/url"
"strings"
"time"
httphelper "github.com/zitadel/oidc/v2/pkg/http"
"github.com/zitadel/oidc/v2/pkg/oidc"
)
type TokenExchangeRequest interface {
GetAMR() []string
GetAudience() []string
GetResourses() []string
GetAuthTime() time.Time
GetClientID() string
GetScopes() []string
GetSubject() string
GetRequestedTokenType() oidc.TokenType
GetExchangeSubject() string
GetExchangeSubjectTokenType() oidc.TokenType
GetExchangeSubjectTokenIDOrToken() string
GetExchangeSubjectTokenClaims() map[string]any
GetExchangeActor() string
GetExchangeActorTokenType() oidc.TokenType
GetExchangeActorTokenIDOrToken() string
GetExchangeActorTokenClaims() map[string]any
SetCurrentScopes(scopes []string)
SetRequestedTokenType(tt oidc.TokenType)
SetSubject(subject string)
}
type tokenExchangeRequest struct {
exchangeSubjectTokenIDOrToken string
exchangeSubjectTokenType oidc.TokenType
exchangeSubject string
exchangeSubjectTokenClaims map[string]any
exchangeActorTokenIDOrToken string
exchangeActorTokenType oidc.TokenType
exchangeActor string
exchangeActorTokenClaims map[string]any
resource []string
audience oidc.Audience
scopes oidc.SpaceDelimitedArray
requestedTokenType oidc.TokenType
clientID string
authTime time.Time
subject string
}
func (r *tokenExchangeRequest) GetAMR() []string {
return []string{}
}
func (r *tokenExchangeRequest) GetAudience() []string {
return r.audience
}
func (r *tokenExchangeRequest) GetResourses() []string {
return r.resource
}
func (r *tokenExchangeRequest) GetAuthTime() time.Time {
return r.authTime
}
func (r *tokenExchangeRequest) GetClientID() string {
return r.clientID
}
func (r *tokenExchangeRequest) GetScopes() []string {
return r.scopes
}
func (r *tokenExchangeRequest) GetRequestedTokenType() oidc.TokenType {
return r.requestedTokenType
}
func (r *tokenExchangeRequest) GetExchangeSubject() string {
return r.exchangeSubject
}
func (r *tokenExchangeRequest) GetExchangeSubjectTokenType() oidc.TokenType {
return r.exchangeSubjectTokenType
}
func (r *tokenExchangeRequest) GetExchangeSubjectTokenIDOrToken() string {
return r.exchangeSubjectTokenIDOrToken
}
func (r *tokenExchangeRequest) GetExchangeSubjectTokenClaims() map[string]any {
return r.exchangeSubjectTokenClaims
}
func (r *tokenExchangeRequest) GetExchangeActor() string {
return r.exchangeActor
}
func (r *tokenExchangeRequest) GetExchangeActorTokenType() oidc.TokenType {
return r.exchangeActorTokenType
}
func (r *tokenExchangeRequest) GetExchangeActorTokenIDOrToken() string {
return r.exchangeActorTokenIDOrToken
}
func (r *tokenExchangeRequest) GetExchangeActorTokenClaims() map[string]any {
return r.exchangeActorTokenClaims
}
func (r *tokenExchangeRequest) GetSubject() string {
return r.subject
}
func (r *tokenExchangeRequest) SetCurrentScopes(scopes []string) {
r.scopes = scopes
}
func (r *tokenExchangeRequest) SetRequestedTokenType(tt oidc.TokenType) {
r.requestedTokenType = tt
}
func (r *tokenExchangeRequest) SetSubject(subject string) {
r.subject = subject
}
// TokenExchange handles the OAuth 2.0 token exchange grant ("urn:ietf:params:oauth:grant-type:token-exchange")
func TokenExchange(w http.ResponseWriter, r *http.Request, exchanger Exchanger) {
ctx, span := tracer.Start(r.Context(), "TokenExchange")
defer span.End()
r = r.WithContext(ctx)
tokenExchangeReq, clientID, clientSecret, err := ParseTokenExchangeRequest(r, exchanger.Decoder())
if err != nil {
RequestError(w, r, err)
}
tokenExchangeRequest, client, err := ValidateTokenExchangeRequest(r.Context(), tokenExchangeReq, clientID, clientSecret, exchanger)
if err != nil {
RequestError(w, r, err)
return
}
resp, err := CreateTokenExchangeResponse(r.Context(), tokenExchangeRequest, client, exchanger)
if err != nil {
RequestError(w, r, err)
return
}
httphelper.MarshalJSON(w, resp)
}
// ParseTokenExchangeRequest parses the http request into oidc.TokenExchangeRequest
func ParseTokenExchangeRequest(r *http.Request, decoder httphelper.Decoder) (_ *oidc.TokenExchangeRequest, clientID, clientSecret string, err error) {
err = r.ParseForm()
if err != nil {
return nil, "", "", oidc.ErrInvalidRequest().WithDescription("error parsing form").WithParent(err)
}
request := new(oidc.TokenExchangeRequest)
err = decoder.Decode(request, r.Form)
if err != nil {
return nil, "", "", oidc.ErrInvalidRequest().WithDescription("error decoding form").WithParent(err)
}
var ok bool
if clientID, clientSecret, ok = r.BasicAuth(); ok {
clientID, err = url.QueryUnescape(clientID)
if err != nil {
return nil, "", "", oidc.ErrInvalidClient().WithDescription("invalid basic auth header").WithParent(err)
}
clientSecret, err = url.QueryUnescape(clientSecret)
if err != nil {
return nil, "", "", oidc.ErrInvalidClient().WithDescription("invalid basic auth header").WithParent(err)
}
}
return request, clientID, clientSecret, nil
}
// ValidateTokenExchangeRequest validates the token exchange request parameters including authorization check of the client,
// subject_token and actor_token
func ValidateTokenExchangeRequest(
ctx context.Context,
oidcTokenExchangeRequest *oidc.TokenExchangeRequest,
clientID, clientSecret string,
exchanger Exchanger,
) (TokenExchangeRequest, Client, error) {
if oidcTokenExchangeRequest.SubjectToken == "" {
return nil, nil, oidc.ErrInvalidRequest().WithDescription("subject_token missing")
}
if oidcTokenExchangeRequest.SubjectTokenType == "" {
return nil, nil, oidc.ErrInvalidRequest().WithDescription("subject_token_type missing")
}
storage := exchanger.Storage()
teStorage, ok := storage.(TokenExchangeStorage)
if !ok {
return nil, nil, oidc.ErrUnsupportedGrantType().WithDescription("token_exchange grant not supported")
}
client, err := AuthorizeTokenExchangeClient(ctx, clientID, clientSecret, exchanger)
if err != nil {
return nil, nil, err
}
if oidcTokenExchangeRequest.RequestedTokenType != "" && !oidcTokenExchangeRequest.RequestedTokenType.IsSupported() {
return nil, nil, oidc.ErrInvalidRequest().WithDescription("requested_token_type is not supported")
}
if !oidcTokenExchangeRequest.SubjectTokenType.IsSupported() {
return nil, nil, oidc.ErrInvalidRequest().WithDescription("subject_token_type is not supported")
}
if oidcTokenExchangeRequest.ActorTokenType != "" && !oidcTokenExchangeRequest.ActorTokenType.IsSupported() {
return nil, nil, oidc.ErrInvalidRequest().WithDescription("actor_token_type is not supported")
}
exchangeSubjectTokenIDOrToken, exchangeSubject, exchangeSubjectTokenClaims, ok := GetTokenIDAndSubjectFromToken(ctx, exchanger,
oidcTokenExchangeRequest.SubjectToken, oidcTokenExchangeRequest.SubjectTokenType, false)
if !ok {
return nil, nil, oidc.ErrInvalidRequest().WithDescription("subject_token is invalid")
}
var (
exchangeActorTokenIDOrToken, exchangeActor string
exchangeActorTokenClaims map[string]any
)
if oidcTokenExchangeRequest.ActorToken != "" {
exchangeActorTokenIDOrToken, exchangeActor, exchangeActorTokenClaims, ok = GetTokenIDAndSubjectFromToken(ctx, exchanger,
oidcTokenExchangeRequest.ActorToken, oidcTokenExchangeRequest.ActorTokenType, true)
if !ok {
return nil, nil, oidc.ErrInvalidRequest().WithDescription("actor_token is invalid")
}
}
req := &tokenExchangeRequest{
exchangeSubjectTokenIDOrToken: exchangeSubjectTokenIDOrToken,
exchangeSubjectTokenType: oidcTokenExchangeRequest.SubjectTokenType,
exchangeSubject: exchangeSubject,
exchangeSubjectTokenClaims: exchangeSubjectTokenClaims,
exchangeActorTokenIDOrToken: exchangeActorTokenIDOrToken,
exchangeActorTokenType: oidcTokenExchangeRequest.ActorTokenType,
exchangeActor: exchangeActor,
exchangeActorTokenClaims: exchangeActorTokenClaims,
subject: exchangeSubject,
resource: oidcTokenExchangeRequest.Resource,
audience: oidcTokenExchangeRequest.Audience,
scopes: oidcTokenExchangeRequest.Scopes,
requestedTokenType: oidcTokenExchangeRequest.RequestedTokenType,
clientID: client.GetID(),
authTime: time.Now(),
}
err = teStorage.ValidateTokenExchangeRequest(ctx, req)
if err != nil {
return nil, nil, err
}
err = teStorage.CreateTokenExchangeRequest(ctx, req)
if err != nil {
return nil, nil, err
}
return req, client, nil
}
func GetTokenIDAndSubjectFromToken(
ctx context.Context,
exchanger Exchanger,
token string,
tokenType oidc.TokenType,
isActor bool,
) (tokenIDOrToken, subject string, claims map[string]any, ok bool) {
switch tokenType {
case oidc.AccessTokenType:
var accessTokenClaims *oidc.AccessTokenClaims
tokenIDOrToken, subject, accessTokenClaims, ok = getTokenIDAndClaims(ctx, exchanger, token)
if !ok {
break
}
claims = accessTokenClaims.Claims
case oidc.RefreshTokenType:
refreshTokenRequest, err := exchanger.Storage().TokenRequestByRefreshToken(ctx, token)
if err != nil {
break
}
tokenIDOrToken, subject, ok = token, refreshTokenRequest.GetSubject(), true
case oidc.IDTokenType:
idTokenClaims, err := VerifyIDTokenHint[*oidc.IDTokenClaims](ctx, token, exchanger.IDTokenHintVerifier(ctx))
if err != nil {
break
}
tokenIDOrToken, subject, claims, ok = token, idTokenClaims.Subject, idTokenClaims.Claims, true
}
if !ok {
if verifier, ok := exchanger.Storage().(TokenExchangeTokensVerifierStorage); ok {
var err error
if isActor {
tokenIDOrToken, subject, claims, err = verifier.VerifyExchangeActorToken(ctx, token, tokenType)
} else {
tokenIDOrToken, subject, claims, err = verifier.VerifyExchangeSubjectToken(ctx, token, tokenType)
}
if err != nil {
return "", "", nil, false
}
return tokenIDOrToken, subject, claims, true
}
return "", "", nil, false
}
return tokenIDOrToken, subject, claims, true
}
// AuthorizeTokenExchangeClient authorizes a client by validating the client_id and client_secret
func AuthorizeTokenExchangeClient(ctx context.Context, clientID, clientSecret string, exchanger Exchanger) (client Client, err error) {
if err := AuthorizeClientIDSecret(ctx, clientID, clientSecret, exchanger.Storage()); err != nil {
return nil, err
}
client, err = exchanger.Storage().GetClientByClientID(ctx, clientID)
if err != nil {
return nil, oidc.ErrInvalidClient().WithParent(err)
}
return client, nil
}
func CreateTokenExchangeResponse(
ctx context.Context,
tokenExchangeRequest TokenExchangeRequest,
client Client,
creator TokenCreator,
) (_ *oidc.TokenExchangeResponse, err error) {
var (
token, refreshToken, tokenType string
validity time.Duration
)
switch tokenExchangeRequest.GetRequestedTokenType() {
case oidc.AccessTokenType, oidc.RefreshTokenType:
token, refreshToken, validity, err = CreateAccessToken(ctx, tokenExchangeRequest, client.AccessTokenType(), creator, client, "")
if err != nil {
return nil, err
}
tokenType = oidc.BearerToken
case oidc.IDTokenType:
token, err = CreateIDToken(ctx, IssuerFromContext(ctx), tokenExchangeRequest, client.IDTokenLifetime(), "", "", creator.Storage(), client)
if err != nil {
return nil, err
}
// not applicable (see https://datatracker.ietf.org/doc/html/rfc8693#section-2-2-1-2-6)
tokenType = "N_A"
default:
// oidc.JWTTokenType and other custom token types are not supported for issuing.
// In the future it can be considered to have custom tokens generation logic injected via op configuration
// or via expanding Storage interface
oidc.ErrInvalidRequest().WithDescription("requested_token_type is invalid")
}
exp := uint64(validity.Seconds())
return &oidc.TokenExchangeResponse{
AccessToken: token,
IssuedTokenType: tokenExchangeRequest.GetRequestedTokenType(),
TokenType: tokenType,
ExpiresIn: exp,
RefreshToken: refreshToken,
Scopes: tokenExchangeRequest.GetScopes(),
}, nil
}
func getTokenIDAndClaims(ctx context.Context, userinfoProvider UserinfoProvider, accessToken string) (string, string, *oidc.AccessTokenClaims, bool) {
tokenIDSubject, err := userinfoProvider.Crypto().Decrypt(accessToken)
if err == nil {
splitToken := strings.Split(tokenIDSubject, ":")
if len(splitToken) != 2 {
return "", "", nil, false
}
return splitToken[0], splitToken[1], nil, true
}
accessTokenClaims, err := VerifyAccessToken[*oidc.AccessTokenClaims](ctx, accessToken, userinfoProvider.AccessTokenVerifier(ctx))
if err != nil {
return "", "", nil, false
}
return accessTokenClaims.JWTID, accessTokenClaims.Subject, accessTokenClaims, true
}