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token_oidc.go
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/
token_oidc.go
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package api
import (
"context"
"crypto/sha256"
"fmt"
"net/http"
"github.com/coreos/go-oidc/v3/oidc"
"github.com/supabase/auth/internal/api/provider"
"github.com/supabase/auth/internal/conf"
"github.com/supabase/auth/internal/models"
"github.com/supabase/auth/internal/observability"
"github.com/supabase/auth/internal/storage"
)
// IdTokenGrantParams are the parameters the IdTokenGrant method accepts
type IdTokenGrantParams struct {
IdToken string `json:"id_token"`
AccessToken string `json:"access_token"`
Nonce string `json:"nonce"`
Provider string `json:"provider"`
ClientID string `json:"client_id"`
Issuer string `json:"issuer"`
}
func (p *IdTokenGrantParams) getProvider(ctx context.Context, config *conf.GlobalConfiguration, r *http.Request) (*oidc.Provider, *conf.OAuthProviderConfiguration, string, []string, error) {
log := observability.GetLogEntry(r)
var cfg *conf.OAuthProviderConfiguration
var issuer string
var providerType string
var acceptableClientIDs []string
switch true {
case p.Provider == "apple" || p.Issuer == provider.IssuerApple:
cfg = &config.External.Apple
providerType = "apple"
issuer = provider.IssuerApple
acceptableClientIDs = append(acceptableClientIDs, config.External.Apple.ClientID...)
if config.External.IosBundleId != "" {
acceptableClientIDs = append(acceptableClientIDs, config.External.IosBundleId)
}
case p.Provider == "google" || p.Issuer == provider.IssuerGoogle:
cfg = &config.External.Google
providerType = "google"
issuer = provider.IssuerGoogle
acceptableClientIDs = append(acceptableClientIDs, config.External.Google.ClientID...)
case p.Provider == "azure" || provider.IsAzureIssuer(p.Issuer):
issuer = p.Issuer
if issuer == "" || !provider.IsAzureIssuer(issuer) {
detectedIssuer, err := provider.DetectAzureIDTokenIssuer(ctx, p.IdToken)
if err != nil {
return nil, nil, "", nil, badRequestError(ErrorCodeValidationFailed, "Unable to detect issuer in ID token for Azure provider").WithInternalError(err)
}
issuer = detectedIssuer
}
cfg = &config.External.Azure
providerType = "azure"
acceptableClientIDs = append(acceptableClientIDs, config.External.Azure.ClientID...)
case p.Provider == "facebook" || p.Issuer == provider.IssuerFacebook:
cfg = &config.External.Facebook
providerType = "facebook"
issuer = provider.IssuerFacebook
acceptableClientIDs = append(acceptableClientIDs, config.External.Facebook.ClientID...)
case p.Provider == "keycloak" || (config.External.Keycloak.Enabled && config.External.Keycloak.URL != "" && p.Issuer == config.External.Keycloak.URL):
cfg = &config.External.Keycloak
providerType = "keycloak"
issuer = config.External.Keycloak.URL
acceptableClientIDs = append(acceptableClientIDs, config.External.Keycloak.ClientID...)
case p.Provider == "kakao" || p.Issuer == provider.IssuerKakao:
cfg = &config.External.Kakao
providerType = "kakao"
issuer = provider.IssuerKakao
acceptableClientIDs = append(acceptableClientIDs, config.External.Kakao.ClientID...)
default:
log.WithField("issuer", p.Issuer).WithField("client_id", p.ClientID).Warn("Use of POST /token with arbitrary issuer and client_id is deprecated for security reasons. Please switch to using the API with provider only!")
allowed := false
for _, allowedIssuer := range config.External.AllowedIdTokenIssuers {
if p.Issuer == allowedIssuer {
allowed = true
providerType = allowedIssuer
acceptableClientIDs = []string{p.ClientID}
issuer = allowedIssuer
break
}
}
if !allowed {
return nil, nil, "", nil, badRequestError(ErrorCodeValidationFailed, fmt.Sprintf("Custom OIDC provider %q not allowed", p.Provider))
}
}
if cfg != nil && !cfg.Enabled {
return nil, nil, "", nil, badRequestError(ErrorCodeProviderDisabled, fmt.Sprintf("Provider (issuer %q) is not enabled", issuer))
}
oidcProvider, err := oidc.NewProvider(ctx, issuer)
if err != nil {
return nil, nil, "", nil, err
}
return oidcProvider, cfg, providerType, acceptableClientIDs, nil
}
// IdTokenGrant implements the id_token grant type flow
func (a *API) IdTokenGrant(ctx context.Context, w http.ResponseWriter, r *http.Request) error {
log := observability.GetLogEntry(r)
db := a.db.WithContext(ctx)
config := a.config
params := &IdTokenGrantParams{}
if err := retrieveRequestParams(r, params); err != nil {
return err
}
if params.IdToken == "" {
return oauthError("invalid request", "id_token required")
}
if params.Provider == "" && (params.ClientID == "" || params.Issuer == "") {
return oauthError("invalid request", "provider or client_id and issuer required")
}
oidcProvider, oauthConfig, providerType, acceptableClientIDs, err := params.getProvider(ctx, config, r)
if err != nil {
return err
}
idToken, userData, err := provider.ParseIDToken(ctx, oidcProvider, nil, params.IdToken, provider.ParseIDTokenOptions{
SkipAccessTokenCheck: params.AccessToken == "",
AccessToken: params.AccessToken,
})
if err != nil {
return oauthError("invalid request", "Bad ID token").WithInternalError(err)
}
userData.Metadata.EmailVerified = false
for _, email := range userData.Emails {
if email.Primary {
userData.Metadata.Email = email.Email
userData.Metadata.EmailVerified = email.Verified
break
} else {
userData.Metadata.Email = email.Email
userData.Metadata.EmailVerified = email.Verified
}
}
if idToken.Subject == "" {
return oauthError("invalid request", "Missing sub claim in id_token")
}
correctAudience := false
for _, clientID := range acceptableClientIDs {
if clientID == "" {
continue
}
for _, aud := range idToken.Audience {
if aud == clientID {
correctAudience = true
break
}
}
if correctAudience {
break
}
}
if !correctAudience {
return oauthError("invalid request", "Unacceptable audience in id_token")
}
if !oauthConfig.SkipNonceCheck {
tokenHasNonce := idToken.Nonce != ""
paramsHasNonce := params.Nonce != ""
if tokenHasNonce != paramsHasNonce {
return oauthError("invalid request", "Passed nonce and nonce in id_token should either both exist or not.")
} else if tokenHasNonce && paramsHasNonce {
// verify nonce to mitigate replay attacks
hash := fmt.Sprintf("%x", sha256.Sum256([]byte(params.Nonce)))
if hash != idToken.Nonce {
return oauthError("invalid nonce", "Nonces mismatch")
}
}
}
if params.AccessToken == "" {
if idToken.AccessTokenHash != "" {
log.Warn("ID token has a at_hash claim, but no access_token parameter was provided. In future versions, access_token will be mandatory as it's security best practice.")
}
} else {
if idToken.AccessTokenHash == "" {
log.Info("ID token does not have a at_hash claim, access_token parameter is unused.")
}
}
var token *AccessTokenResponse
var grantParams models.GrantParams
grantParams.FillGrantParams(r)
if err := db.Transaction(func(tx *storage.Connection) error {
var user *models.User
var terr error
user, terr = a.createAccountFromExternalIdentity(tx, r, userData, providerType)
if terr != nil {
return terr
}
token, terr = a.issueRefreshToken(r, tx, user, models.OAuth, grantParams)
if terr != nil {
return terr
}
return nil
}); err != nil {
switch err.(type) {
case *storage.CommitWithError:
return err
default:
return oauthError("server_error", "Internal Server Error").WithInternalError(err)
}
}
return sendJSON(w, http.StatusOK, token)
}