/
external.go
654 lines (586 loc) · 20.6 KB
/
external.go
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package api
import (
"context"
"errors"
"fmt"
"net/http"
"net/url"
"strconv"
"strings"
"time"
"github.com/fatih/structs"
"github.com/gofrs/uuid"
jwt "github.com/golang-jwt/jwt"
"github.com/sirupsen/logrus"
"github.com/supabase/auth/internal/api/provider"
"github.com/supabase/auth/internal/models"
"github.com/supabase/auth/internal/observability"
"github.com/supabase/auth/internal/storage"
"github.com/supabase/auth/internal/utilities"
"golang.org/x/oauth2"
)
// ExternalProviderClaims are the JWT claims sent as the state in the external oauth provider signup flow
type ExternalProviderClaims struct {
AuthMicroserviceClaims
Provider string `json:"provider"`
InviteToken string `json:"invite_token,omitempty"`
Referrer string `json:"referrer,omitempty"`
FlowStateID string `json:"flow_state_id"`
LinkingTargetID string `json:"linking_target_id,omitempty"`
}
// ExternalProviderRedirect redirects the request to the oauth provider
func (a *API) ExternalProviderRedirect(w http.ResponseWriter, r *http.Request) error {
rurl, err := a.GetExternalProviderRedirectURL(w, r, nil)
if err != nil {
return err
}
http.Redirect(w, r, rurl, http.StatusFound)
return nil
}
// GetExternalProviderRedirectURL returns the URL to start the oauth flow with the corresponding oauth provider
func (a *API) GetExternalProviderRedirectURL(w http.ResponseWriter, r *http.Request, linkingTargetUser *models.User) (string, error) {
ctx := r.Context()
db := a.db.WithContext(ctx)
config := a.config
query := r.URL.Query()
providerType := query.Get("provider")
scopes := query.Get("scopes")
codeChallenge := query.Get("code_challenge")
codeChallengeMethod := query.Get("code_challenge_method")
p, err := a.Provider(ctx, providerType, scopes)
if err != nil {
return "", badRequestError("Unsupported provider: %+v", err).WithInternalError(err)
}
inviteToken := query.Get("invite_token")
if inviteToken != "" {
_, userErr := models.FindUserByConfirmationToken(db, inviteToken)
if userErr != nil {
if models.IsNotFoundError(userErr) {
return "", notFoundError(userErr.Error())
}
return "", internalServerError("Database error finding user").WithInternalError(userErr)
}
}
redirectURL := utilities.GetReferrer(r, config)
log := observability.GetLogEntry(r)
log.WithField("provider", providerType).Info("Redirecting to external provider")
if err := validatePKCEParams(codeChallengeMethod, codeChallenge); err != nil {
return "", err
}
flowType := getFlowFromChallenge(codeChallenge)
flowStateID := ""
if isPKCEFlow(flowType) {
flowState, err := generateFlowState(providerType, models.OAuth, codeChallengeMethod, codeChallenge, nil)
if err != nil {
return "", err
}
if err := a.db.Create(flowState); err != nil {
return "", err
}
flowStateID = flowState.ID.String()
}
claims := ExternalProviderClaims{
AuthMicroserviceClaims: AuthMicroserviceClaims{
StandardClaims: jwt.StandardClaims{
ExpiresAt: time.Now().Add(5 * time.Minute).Unix(),
},
SiteURL: config.SiteURL,
InstanceID: uuid.Nil.String(),
},
Provider: providerType,
InviteToken: inviteToken,
Referrer: redirectURL,
FlowStateID: flowStateID,
}
if linkingTargetUser != nil {
// this means that the user is performing manual linking
claims.LinkingTargetID = linkingTargetUser.ID.String()
}
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
tokenString, err := token.SignedString([]byte(config.JWT.Secret))
if err != nil {
return "", internalServerError("Error creating state").WithInternalError(err)
}
authUrlParams := make([]oauth2.AuthCodeOption, 0)
query.Del("scopes")
query.Del("provider")
query.Del("code_challenge")
query.Del("code_challenge_method")
for key := range query {
if key == "workos_provider" {
// See https://workos.com/docs/reference/sso/authorize/get
authUrlParams = append(authUrlParams, oauth2.SetAuthURLParam("provider", query.Get(key)))
} else {
authUrlParams = append(authUrlParams, oauth2.SetAuthURLParam(key, query.Get(key)))
}
}
authURL := p.AuthCodeURL(tokenString, authUrlParams...)
return authURL, nil
}
// ExternalProviderCallback handles the callback endpoint in the external oauth provider flow
func (a *API) ExternalProviderCallback(w http.ResponseWriter, r *http.Request) error {
rurl := a.getExternalRedirectURL(r)
u, err := url.Parse(rurl)
if err != nil {
return err
}
a.redirectErrors(a.internalExternalProviderCallback, w, r, u)
return nil
}
func (a *API) handleOAuthCallback(r *http.Request) (*OAuthProviderData, error) {
ctx := r.Context()
providerType := getExternalProviderType(ctx)
var oAuthResponseData *OAuthProviderData
var err error
switch providerType {
case "twitter":
// future OAuth1.0 providers will use this method
oAuthResponseData, err = a.oAuth1Callback(ctx, providerType)
default:
oAuthResponseData, err = a.oAuthCallback(ctx, r, providerType)
}
if err != nil {
return nil, err
}
return oAuthResponseData, nil
}
func (a *API) internalExternalProviderCallback(w http.ResponseWriter, r *http.Request) error {
ctx := r.Context()
db := a.db.WithContext(ctx)
config := a.config
var grantParams models.GrantParams
grantParams.FillGrantParams(r)
providerType := getExternalProviderType(ctx)
data, err := a.handleOAuthCallback(r)
if err != nil {
return err
}
userData := data.userData
if len(userData.Emails) <= 0 {
return internalServerError("Error getting user email from external provider")
}
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
}
}
providerAccessToken := data.token
providerRefreshToken := data.refreshToken
var flowState *models.FlowState
// if there's a non-empty FlowStateID we perform PKCE Flow
if flowStateID := getFlowStateID(ctx); flowStateID != "" {
flowState, err = models.FindFlowStateByID(a.db, flowStateID)
if err != nil {
return err
}
}
var user *models.User
var token *AccessTokenResponse
err = db.Transaction(func(tx *storage.Connection) error {
var terr error
if targetUser := getTargetUser(ctx); targetUser != nil {
if user, terr = a.linkIdentityToUser(r, ctx, tx, userData, providerType); terr != nil {
return terr
}
} else if inviteToken := getInviteToken(ctx); inviteToken != "" {
if user, terr = a.processInvite(r, tx, userData, inviteToken, providerType); terr != nil {
return terr
}
} else {
if user, terr = a.createAccountFromExternalIdentity(tx, r, userData, providerType); terr != nil {
return terr
}
}
if flowState != nil {
// This means that the callback is using PKCE
flowState.ProviderAccessToken = providerAccessToken
flowState.ProviderRefreshToken = providerRefreshToken
flowState.UserID = &(user.ID)
terr = tx.Update(flowState)
} else {
token, terr = a.issueRefreshToken(ctx, tx, user, models.OAuth, grantParams)
}
if terr != nil {
return oauthError("server_error", terr.Error())
}
return nil
})
if err != nil {
return err
}
rurl := a.getExternalRedirectURL(r)
if flowState != nil {
// This means that the callback is using PKCE
// Set the flowState.AuthCode to the query param here
rurl, err = a.prepPKCERedirectURL(rurl, flowState.AuthCode)
if err != nil {
return err
}
} else if token != nil {
q := url.Values{}
q.Set("provider_token", providerAccessToken)
// Because not all providers give out a refresh token
// See corresponding OAuth2 spec: <https://www.rfc-editor.org/rfc/rfc6749.html#section-5.1>
if providerRefreshToken != "" {
q.Set("provider_refresh_token", providerRefreshToken)
}
rurl = token.AsRedirectURL(rurl, q)
if err := a.setCookieTokens(config, token, false, w); err != nil {
return internalServerError("Failed to set JWT cookie. %s", err)
}
}
http.Redirect(w, r, rurl, http.StatusFound)
return nil
}
func (a *API) createAccountFromExternalIdentity(tx *storage.Connection, r *http.Request, userData *provider.UserProvidedData, providerType string) (*models.User, error) {
ctx := r.Context()
aud := a.requestAud(ctx, r)
config := a.config
var user *models.User
var identity *models.Identity
var identityData map[string]interface{}
if userData.Metadata != nil {
identityData = structs.Map(userData.Metadata)
}
decision, terr := models.DetermineAccountLinking(tx, config, userData.Emails, aud, providerType, userData.Metadata.Subject)
if terr != nil {
return nil, terr
}
switch decision.Decision {
case models.LinkAccount:
user = decision.User
if identity, terr = a.createNewIdentity(tx, user, providerType, identityData); terr != nil {
return nil, terr
}
if terr = user.UpdateAppMetaDataProviders(tx); terr != nil {
return nil, terr
}
case models.CreateAccount:
if config.DisableSignup {
return nil, forbiddenError("Signups not allowed for this instance")
}
params := &SignupParams{
Provider: providerType,
Email: decision.CandidateEmail.Email,
Aud: aud,
Data: identityData,
}
isSSOUser := false
if strings.HasPrefix(decision.LinkingDomain, "sso:") {
isSSOUser = true
}
// because params above sets no password, this method is not
// computationally hard so it can be used within a database
// transaction
user, terr = params.ToUserModel(isSSOUser)
if terr != nil {
return nil, terr
}
if user, terr = a.signupNewUser(tx, user); terr != nil {
return nil, terr
}
if identity, terr = a.createNewIdentity(tx, user, providerType, identityData); terr != nil {
return nil, terr
}
case models.AccountExists:
user = decision.User
identity = decision.Identities[0]
identity.IdentityData = identityData
if terr = tx.UpdateOnly(identity, "identity_data", "last_sign_in_at"); terr != nil {
return nil, terr
}
if terr = user.UpdateUserMetaData(tx, identityData); terr != nil {
return nil, terr
}
if terr = user.UpdateAppMetaDataProviders(tx); terr != nil {
return nil, terr
}
case models.MultipleAccounts:
return nil, internalServerError(fmt.Sprintf("Multiple accounts with the same email address in the same linking domain detected: %v", decision.LinkingDomain))
default:
return nil, internalServerError(fmt.Sprintf("Unknown automatic linking decision: %v", decision.Decision))
}
if user.IsBanned() {
return nil, unauthorizedError("User is unauthorized")
}
if !user.IsConfirmed() {
// The user may have other unconfirmed email + password
// combination, phone or oauth identities. These identities
// need to be removed when a new oauth identity is being added
// to prevent pre-account takeover attacks from happening.
if terr = user.RemoveUnconfirmedIdentities(tx, identity); terr != nil {
return nil, internalServerError("Error updating user").WithInternalError(terr)
}
if decision.CandidateEmail.Verified || config.Mailer.Autoconfirm {
if terr := models.NewAuditLogEntry(r, tx, user, models.UserSignedUpAction, "", map[string]interface{}{
"provider": providerType,
}); terr != nil {
return nil, terr
}
// fall through to auto-confirm and issue token
if terr = user.Confirm(tx); terr != nil {
return nil, internalServerError("Error updating user").WithInternalError(terr)
}
} else {
emailConfirmationSent := false
if decision.CandidateEmail.Email != "" {
mailer := a.Mailer(ctx)
referrer := utilities.GetReferrer(r, config)
externalURL := getExternalHost(ctx)
if terr = sendConfirmation(tx, user, mailer, config.SMTP.MaxFrequency, referrer, externalURL, config.Mailer.OtpLength, models.ImplicitFlow); terr != nil {
if errors.Is(terr, MaxFrequencyLimitError) {
return nil, tooManyRequestsError("For security purposes, you can only request this once every minute")
}
return nil, internalServerError("Error sending confirmation mail").WithInternalError(terr)
}
emailConfirmationSent = true
}
if !config.Mailer.AllowUnverifiedEmailSignIns {
if emailConfirmationSent {
return nil, storage.NewCommitWithError(unauthorizedError(fmt.Sprintf("Unverified email with %v. A confirmation email has been sent to your %v email", providerType, providerType)))
}
return nil, storage.NewCommitWithError(unauthorizedError(fmt.Sprintf("Unverified email with %v. Verify the email with %v in order to sign in", providerType, providerType)))
}
}
} else {
if terr := models.NewAuditLogEntry(r, tx, user, models.LoginAction, "", map[string]interface{}{
"provider": providerType,
}); terr != nil {
return nil, terr
}
}
return user, nil
}
func (a *API) processInvite(r *http.Request, tx *storage.Connection, userData *provider.UserProvidedData, inviteToken, providerType string) (*models.User, error) {
user, err := models.FindUserByConfirmationToken(tx, inviteToken)
if err != nil {
if models.IsNotFoundError(err) {
return nil, notFoundError(err.Error())
}
return nil, internalServerError("Database error finding user").WithInternalError(err)
}
var emailData *provider.Email
var emails []string
for i, e := range userData.Emails {
emails = append(emails, e.Email)
if user.GetEmail() == e.Email {
emailData = &userData.Emails[i]
break
}
}
if emailData == nil {
return nil, badRequestError("Invited email does not match emails from external provider").WithInternalMessage("invited=%s external=%s", user.Email, strings.Join(emails, ", "))
}
var identityData map[string]interface{}
if userData.Metadata != nil {
identityData = structs.Map(userData.Metadata)
}
identity, err := a.createNewIdentity(tx, user, providerType, identityData)
if err != nil {
return nil, err
}
if err := user.UpdateAppMetaData(tx, map[string]interface{}{
"provider": providerType,
}); err != nil {
return nil, err
}
if err := user.UpdateAppMetaDataProviders(tx); err != nil {
return nil, err
}
if err := user.UpdateUserMetaData(tx, identityData); err != nil {
return nil, internalServerError("Database error updating user").WithInternalError(err)
}
if err := models.NewAuditLogEntry(r, tx, user, models.InviteAcceptedAction, "", map[string]interface{}{
"provider": providerType,
}); err != nil {
return nil, err
}
// an account with a previously unconfirmed email + password
// combination or phone may exist. so now that there is an
// OAuth identity bound to this user, and since they have not
// confirmed their email or phone, they are unaware that a
// potentially malicious door exists into their account; thus
// the password and phone needs to be removed.
if err := user.RemoveUnconfirmedIdentities(tx, identity); err != nil {
return nil, internalServerError("Error updating user").WithInternalError(err)
}
// confirm because they were able to respond to invite email
if err := user.Confirm(tx); err != nil {
return nil, err
}
return user, nil
}
func (a *API) loadExternalState(ctx context.Context, state string) (context.Context, error) {
config := a.config
claims := ExternalProviderClaims{}
p := jwt.Parser{ValidMethods: []string{jwt.SigningMethodHS256.Name}}
_, err := p.ParseWithClaims(state, &claims, func(token *jwt.Token) (interface{}, error) {
return []byte(config.JWT.Secret), nil
})
if err != nil || claims.Provider == "" {
return nil, badRequestError("OAuth state is invalid: %v", err)
}
if claims.InviteToken != "" {
ctx = withInviteToken(ctx, claims.InviteToken)
}
if claims.Referrer != "" {
ctx = withExternalReferrer(ctx, claims.Referrer)
}
if claims.FlowStateID != "" {
ctx = withFlowStateID(ctx, claims.FlowStateID)
}
if claims.LinkingTargetID != "" {
linkingTargetUserID, err := uuid.FromString(claims.LinkingTargetID)
if err != nil {
return nil, badRequestError("invalid target user id")
}
u, err := models.FindUserByID(a.db, linkingTargetUserID)
if err != nil {
if models.IsNotFoundError(err) {
return nil, notFoundError("Linking target user not found")
}
return nil, internalServerError("Database error loading user").WithInternalError(err)
}
ctx = withTargetUser(ctx, u)
}
ctx = withExternalProviderType(ctx, claims.Provider)
return withSignature(ctx, state), nil
}
// Provider returns a Provider interface for the given name.
func (a *API) Provider(ctx context.Context, name string, scopes string) (provider.Provider, error) {
config := a.config
name = strings.ToLower(name)
switch name {
case "apple":
return provider.NewAppleProvider(ctx, config.External.Apple)
case "azure":
return provider.NewAzureProvider(config.External.Azure, scopes)
case "bitbucket":
return provider.NewBitbucketProvider(config.External.Bitbucket)
case "discord":
return provider.NewDiscordProvider(config.External.Discord, scopes)
case "facebook":
return provider.NewFacebookProvider(config.External.Facebook, scopes)
case "figma":
return provider.NewFigmaProvider(config.External.Figma, scopes)
case "fly":
return provider.NewFlyProvider(config.External.Fly, scopes)
case "github":
return provider.NewGithubProvider(config.External.Github, scopes)
case "gitlab":
return provider.NewGitlabProvider(config.External.Gitlab, scopes)
case "google":
return provider.NewGoogleProvider(ctx, config.External.Google, scopes)
case "kakao":
return provider.NewKakaoProvider(config.External.Kakao, scopes)
case "keycloak":
return provider.NewKeycloakProvider(config.External.Keycloak, scopes)
case "linkedin":
return provider.NewLinkedinProvider(config.External.Linkedin, scopes)
case "linkedin_oidc":
return provider.NewLinkedinOIDCProvider(config.External.LinkedinOIDC, scopes)
case "notion":
return provider.NewNotionProvider(config.External.Notion)
case "spotify":
return provider.NewSpotifyProvider(config.External.Spotify, scopes)
case "slack":
return provider.NewSlackProvider(config.External.Slack, scopes)
case "twitch":
return provider.NewTwitchProvider(config.External.Twitch, scopes)
case "twitter":
return provider.NewTwitterProvider(config.External.Twitter, scopes)
case "workos":
return provider.NewWorkOSProvider(config.External.WorkOS)
case "zoom":
return provider.NewZoomProvider(config.External.Zoom)
default:
return nil, fmt.Errorf("Provider %s could not be found", name)
}
}
func (a *API) redirectErrors(handler apiHandler, w http.ResponseWriter, r *http.Request, u *url.URL) {
ctx := r.Context()
log := observability.GetLogEntry(r)
errorID := getRequestID(ctx)
err := handler(w, r)
if err != nil {
q := getErrorQueryString(err, errorID, log, u.Query())
u.RawQuery = q.Encode()
// TODO: deprecate returning error details in the query fragment
hq := url.Values{}
if q.Get("error") != "" {
hq.Set("error", q.Get("error"))
}
if q.Get("error_description") != "" {
hq.Set("error_description", q.Get("error_description"))
}
if q.Get("error_code") != "" {
hq.Set("error_code", q.Get("error_code"))
}
u.Fragment = hq.Encode()
http.Redirect(w, r, u.String(), http.StatusFound)
}
}
func getErrorQueryString(err error, errorID string, log logrus.FieldLogger, q url.Values) *url.Values {
switch e := err.(type) {
case *HTTPError:
if str, ok := oauthErrorMap[e.Code]; ok {
q.Set("error", str)
} else {
q.Set("error", "server_error")
}
if e.Code >= http.StatusInternalServerError {
e.ErrorID = errorID
// this will get us the stack trace too
log.WithError(e.Cause()).Error(e.Error())
} else {
log.WithError(e.Cause()).Info(e.Error())
}
q.Set("error_description", e.Message)
q.Set("error_code", strconv.Itoa(e.Code))
case *OAuthError:
q.Set("error", e.Err)
q.Set("error_description", e.Description)
log.WithError(e.Cause()).Info(e.Error())
case ErrorCause:
return getErrorQueryString(e.Cause(), errorID, log, q)
default:
error_type, error_description := "server_error", err.Error()
// Provide better error messages for certain user-triggered Postgres errors.
if pgErr := utilities.NewPostgresError(e); pgErr != nil {
error_description = pgErr.Message
if oauthErrorType, ok := oauthErrorMap[pgErr.HttpStatusCode]; ok {
error_type = oauthErrorType
}
}
q.Set("error", error_type)
q.Set("error_description", error_description)
}
return &q
}
func (a *API) getExternalRedirectURL(r *http.Request) string {
ctx := r.Context()
config := a.config
if config.External.RedirectURL != "" {
return config.External.RedirectURL
}
if er := getExternalReferrer(ctx); er != "" {
return er
}
return config.SiteURL
}
func (a *API) createNewIdentity(tx *storage.Connection, user *models.User, providerType string, identityData map[string]interface{}) (*models.Identity, error) {
identity, err := models.NewIdentity(user, providerType, identityData)
if err != nil {
return nil, err
}
if terr := tx.Create(identity); terr != nil {
return nil, internalServerError("Error creating identity").WithInternalError(terr)
}
return identity, nil
}