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mw_oauth2_key_exists.go
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/
mw_oauth2_key_exists.go
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package main
import (
"errors"
"net/http"
"strings"
"time"
"github.com/TykTechnologies/tyk/apidef"
)
const (
checkOAuthClientDeletedInetrval = 1 * time.Second
)
// Oauth2KeyExists will check if the key being used to access the API is in the request data,
// and then if the key is in the storage engine
type Oauth2KeyExists struct {
BaseMiddleware
}
func (k *Oauth2KeyExists) Name() string {
return "Oauth2KeyExists"
}
func (k *Oauth2KeyExists) EnabledForSpec() bool {
return k.Spec.UseOauth2
}
// ProcessRequest will run any checks on the request on the way through the system, return an error to have the chain fail
func (k *Oauth2KeyExists) ProcessRequest(w http.ResponseWriter, r *http.Request, _ interface{}) (error, int) {
logger := k.Logger()
// We're using OAuth, start checking for access keys
token := r.Header.Get("Authorization")
parts := strings.Split(token, " ")
if len(parts) < 2 {
logger.Info("Attempted access with malformed header, no auth header found.")
return errors.New("Authorization field missing"), http.StatusBadRequest
}
if strings.ToLower(parts[0]) != "bearer" {
logger.Info("Bearer token malformed")
return errors.New("Bearer token malformed"), http.StatusBadRequest
}
accessToken := parts[1]
logger = logger.WithField("key", obfuscateKey(accessToken))
// get session for the given oauth token
session, keyExists := k.CheckSessionAndIdentityForValidKey(accessToken, r)
if !keyExists {
logger.Warning("Attempted access with non-existent key.")
// Fire Authfailed Event
AuthFailed(k, r, accessToken)
// Report in health check
reportHealthValue(k.Spec, KeyFailure, "-1")
return errors.New("Key not authorised"), http.StatusForbidden
}
// Make sure OAuth-client is still present
oauthClientDeletedKey := "oauth-del-" + k.Spec.APIID + session.OauthClientID
oauthClientDeleted := false
// check if that oauth client was deleted with using memory cache first
if val, found := UtilCache.Get(oauthClientDeletedKey); found {
oauthClientDeleted = val.(bool)
} else {
// if not cached in memory then hit Redis to get oauth-client from there
if _, err := k.Spec.OAuthManager.OsinServer.Storage.GetClient(session.OauthClientID); err != nil {
// set this oauth client as deleted in memory cache for the next N sec
UtilCache.Set(oauthClientDeletedKey, true, checkOAuthClientDeletedInetrval)
oauthClientDeleted = true
} else {
// set this oauth client as NOT deleted in memory cache for next N sec
UtilCache.Set(oauthClientDeletedKey, false, checkOAuthClientDeletedInetrval)
}
}
if oauthClientDeleted {
logger.WithField("oauthClientID", session.OauthClientID).Warning("Attempted access for deleted OAuth client.")
return errors.New("Key not authorised. OAuth client access was revoked"), http.StatusForbidden
}
// Set session state on context, we will need it later
switch k.Spec.BaseIdentityProvidedBy {
case apidef.OAuthKey, apidef.UnsetAuth:
ctxSetSession(r, &session, accessToken, false)
}
// Request is valid, carry on
return nil, http.StatusOK
}