Curious to know if you have an idea on timing. Thanks @safihamid. Type: azure-arm Artifact BuilderId: Azure.ResourceManagement.VMImage Packer supports building Virtual Hard Disks (VHDs) and Managed Images in Azure Resource Manager.Azure provides new users a $200 credit for the first 30 days; after which you will incur costs for VMs built and stored using Packer.. Azure uses a … By clicking “Sign up for GitHub”, you agree to our terms of service and You will need to update your Proxy runtime version to ~0.2 from the portal. Yes, sorry for the delay! Mostly followed as per the following post except mine is CORS: This article shows how to solve this challenge by using API Management service which be used to secure Logic Apps HTTP endpoint with Azure AD token authentication. API Keys Azure Functions AuthorizationLevel.Function. But in the case of azure function, with http trigger your function do not get chance to have say in that. @burma-shave You're not wrong at all, that is precisely my use-case also, a JWT using Authorization: Bearer {}, Access-Control-Allow-Credentials is required for this. So, if you are having trouble getting manual CORS to work: @safihamid not sure if this is expected side effect of enabling proxies. Thank you for reconsidering! Credentials are cookies, authorization headers or TLS client certificates. In addition, with cookies you have the option of setting the "httpOnly" flag on cookie creation. https://github.com/damienbod/AzureFunctionsSecurity, Securing Azure Functions using Certificate authentication, Securing Azure Functions using an Azure Virtual Network, Securing Azure Key Vault inside a VNET and using from an Azure Function, Securing Azure Functions using Azure AD JWT Bearer token authentication for user access tokens, Dew Drop – August 17, 2020 (#3255) | Morning Dew, Securing Azure Functions using Azure AD JWT Bearer token authentication for user access tokens | Software Engineering. That will allow us to better track it. Both have their advantages and disadvantages and I think cookies, when handled properly, come out slightly ahead. @TechInceptions this is the name of an ARM (Azure Resource Manager) property. The Node.js JWT middleware checks that the JWT token received in the http request from the client is valid before allowing access to the API, if the token is invalid a 401 Unauthorized response is returned.. It is very much appreciated! This article shows you how to configure Azure App Service or Azure Functions to use a custom authentication provider that adheres to the OpenID Connect specification.OpenID Connect (OIDC) is an industry standard used by many identity providers (IDPs). It can be exposed when the true value is returned. We'll put this on the backlog category for tracking purposes, but please file a UserVoice suggestion for Azure Web Apps here: https://feedback.azure.com/forums/169385-web-apps-formerly-websites. This is our default CORS setting for Proxies: * *
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. Azure Functions comes with three levels of authorization. Implementing your code helped me isolate the issue. 👍. But I don't think these concerns are a for or against justification of supporting -Credentials CORS on Azure. console.log(data); But in this case developer got away by disabling azure CORS handling and handled it in the web api code. I discovered that this was because I had enabled the new Azure Functions Proxies (preview). response.json().then(function(data){ Ideally I would like to make the call /.auth/me call and establish if the user is authenticated as described in the example: https://shellmonger.com/2016/02/12/using-azure-app-service-authentication-with-a-web-application/, This is an Azure App Service feature request, not specific to Azure Functions. I did give up on this. Successfully merging a pull request may close this issue. privacy statement. There has to be a disconnect somewhere. `SetIsOriginAllowedToAllowWildcardSubdomains()` support in the App Service Portal's CORS blade. In which tool/service/SDK/package do we find "CORS config"? You’ll know: Appropriate Flow for User Signup & User Login with JWT Authentication Node.js Express Architecture with CORS, Authenticaton & Authorization middlewares, Mongoose ODM Way to configure Express routes to work with JWT … See our announcement here: https://azure.microsoft.com/en-us/blog/simplifying-security-for-serverless-and-web-apps-with-azure-functions-and-app-service/. I feel like the request has been misunderstood and needs to be reconsidered. This is a huge negative, that I believe completely counters the positive of stopping CSRF. API Keys Azure Functions AuthorizationLevel.Admin. I could choose to store my JWT token in an httpOnly cookie, and while this means I cannot read it from my App, I still get some of the benefits of both. This is the main, and only real security advantage I can see that tokens have over cookies. Have a question about this project? Sign in When I clear all URLS from API -> CORS in the Azure Portal the "Access-Control-Allow-Credentials" header works properly and is set to true, but "Access-Control-Allow-Origin" is not passed through and therefore is not set. Origin '< removed >' is therefore not allowed access. To enable this in App Service, set properties.cors.supportCredentials to true in your CORS config. If using Anonymous, no security is required. This works well except that the .auth/* routes are not impacted by the custom CORS logic in my service. Azure Functions (Serverless) with Vert.x Web, Servlet, or RESTEasy This guide explains how you can deploy Vert.x Web, Servlet, or RESTEasy microservices as an Azure Function. (I'm continuously deploying based on a git repository). There were some concerns about the security implications of supporting such a feature, and we're discussing that internally now. Let me know if you have any other thoughts/comments/feedback you'd be willing to share about your need for this. Azure AD B2C supports the following types: Bearer token. Done on my end. We will be using Azure AD access token to deploy the workspace, utilizing the OAuth Client Credential workflow, which is also referred to as two-legged OAuth to access web-hosted resources by using the identity of an application. Open the functions in the portal, select the Functions blade and select the Function which requires an API key. Apparently because I cleared out the "deployments" directory of logs, it actually caused my future deployments to say they were working, but actually fail to put my code into wwwroot. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. What does this refer to? Using Postman, the Function with the API Key can be tested. I understand reasoning behind not allowing allowedOrigins to be '*' in conjunction with supportCredentials. The API key is shared between both applications which is one of the problems with this security architecture. This will mean you are sending both a session cookie and a CSRF token; but when you do you have completely blocked CSRF. The JWT includes 3 … This workaround isn't a solution, we need either a way to disable Azure's CORS responses and remove the warning regarding functions.azure.com, or the Azure CORS support needs to be extended to support the -Credentials header. From a security stand-point, utilizing tokens completely prevents Cross-Site Request Forgery (CSRF) attacks. Authentication; Secure data transfer; JWT Token Structure . To authenticate, the application uses an Azure AD public client created using an Azure App Registration. @satjinder Thanks for the tip that removing all CORS entries allows for the headers to be set manually in the response in code. This is useful, if you have no control over the API client implementation, the client code base cannot be easily changed or the client is not Azure hosted. I'll reply back after another round of internal discussion. Another stackoverflow issue but for azure app services. Adding a configuration option in the portal that sets another HTTP Header does not sound like something that should be a huge development effort. I'm not sure the issue @safihamid fixed is the same one that was originally reported. I may well be wrong about this, but I was under the impression you still need Access-Control-Allow-Credentials to be true to pass auth tokens in the Authorization header. The Access-Control-Allow-Credentials response header indicates whether or not the response to the request can be exposed to the page. In which tool/service/SDK/package do we find "properties.cors.supportCredentials"? I'd encourage anyone interested in getting this fixed to upvote on UserVoice, The feature request was declined because the feature is not supported? That's not the behavior I obtained when I removed all entries in the CORS settings (in the Functions area). Combined with protected branches, you can restrict who is able to authenticate and read the secrets.. token_explicit_max_ttl specifies that the token issued by Vault, upon successful authentication, has a hard lifetime limit of 60 seconds. Both my headers are getting through fine: And here are my response headers in Chrome: After looking through the code, I see a difference in our responses: Perhaps the context.res is not respecting your header and the done method is. Code: https://github.com/damienbod/AzureFunctionsSecurity, Azure Functions AuthorizationLevel.Anonymous. .SetIsOriginAllowedToAllowWildcardSubdomains(); CORS with Access-Control-Allow-Credentials, https://azure.microsoft.com/en-us/blog/simplifying-security-for-serverless-and-web-apps-with-azure-functions-and-app-service/, https://docs.microsoft.com/en-us/azure/app-service/app-service-web-tutorial-rest-api#enable-cors. module.exports = function(context, req) { context.log('Node.js HTTP trigger function processed a request. See this tutorial for how to configure CORS in Azure App Service (works exactly the same for Functions): https://docs.microsoft.com/en-us/azure/app-service/app-service-web-tutorial-rest-api#enable-cors. Self Contained: because JWT itself holds user information. @auth0/angular-jwt. Secure, Manage & Extend your APIs or Microservices with plugins for authentication, logging, rate-limiting, transformations and more. Note: Now I get a warning that CORS is not configured for the functions domain: @ricklove Can you please clarify what you did? @burma-shave Thanks for that info, a quick search confirms: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Credentials. This cannot be enabled when allowedOrigins includes '*'. (Including the * wildcard entry.) I agree, it looks like the feature request on the feedback site was misunderstood. The whole response on that thread for the NFR doesn't make any sense at all and this is very much needed. I disagree with this. I will notify this thread when the fix is live. Required fields are marked *. @christopheranderson thanks for the reply. The HTTP URL parameters are encypted in a HTTPS request, but usually get logged. Securing Azure Functions using Azure AD JWT Bearer token authentication for user access tokens Azure Functions AuthorizationLevel.Anonymous When setting up new Azure Functions, the trigger used can set the AuthorizationLevel enum of the Function. You will need to call this function with an ajax cross origin call (from a different domain) in order to trigger the CORS browser behavior. @ricklove we don't really do anything specific with CORS in Functions Proxies. This cannot be set for each function. In my use case, I'm using the Authorization header which also requires the -Credentials CORS rule, with a token. @ricklove Thank-you. While XSS's possibilities of actually being able to execute are reduced with a JSON application that properly sets the Content-Type to application/json; XSS is still one of the most common vulnerabilities in web applications. You can prevent this behavior, however, by sending CSRF tokens from the framework itself to the server. Fast transmission makes JWT more usable. When I set API -> CORS in the Azure Portal to my domain name, that header is set properly, but Access-Control-Allow-Credentials is not set. If there are security advantages of tokens I'm missing; please let me know. console.log(err); It must be 'true' to allow credentials. This is required in order to bypass the CORS logic as mentioned above. This doesn't mean we're right, but I've thought a decent bit about this. Since tokens have to be added by JavaScript code running in the context of the domain, CSRF is stopped by default. I'm definitely open to learning something new. This example uses bound_claims to specify that only a JWT with matching values for the specified claims is allowed to authenticate.. If anything it highlights that the issue is known and needs to be fixed. I actually wasn't. No API Key is required for this. We recently added support for Access-Control-Allow-Credentials. Thanks to the tip shared in post regarding azure app service. Can the original posters please comment? They work to prevent CSRF attacks because a CSRF vulnerability is reliant on the web-browser automatically adding the session token when a request is sent for a given domain, even from an untrusted domain. There is no way to use a token, and avoid this exploit scenario IF XSS is found in the application. Remove all entries from the portal CORS panel. If the roles parameter is omitted (i.e. Is there a way to add custom headers? Though with the workaround, I am able to get resources, but it still does not allow /.auth/* calls. My work is in web development, so from a security point of view, someone should do their own research on top of my comments. This is great news. That solved my problem, and I can have my own custom logic for checking valid domains now. If your app requires credentials such as cookies or authentication tokens to be sent, the browser may require the ACCESS-CONTROL-ALLOW-CREDENTIALS header on the response. However, being immune to this problem comes at a cost. Lastly, I think it is important to say, that I am in no way a security professional. I do feel you have a point @nevercast, however, I'm not sure XSS is better understood (though I could very well be wrong). It has only access to the top API. I'm still not sure about the original issue, there was a lot of back-and-forth. One reason why we didn't expect this to be a problem is that we expected most SPA apps to use authentication tokens instead of cookies to authenticate with the backend, thus removing the need for Access-Control-Allow-Credentials. Amazon Lambda This should only be used with trusted clients and is for machine to machine usage. This site uses Akismet to reduce spam. Would you please let us know your scenario and how we can repro this? The Azure App Registration is setup to support the OIDC Connect code flow with PKCE and uses a delegated access token for our backend. I don't believe it is the responsibility of Azure App Service/Function Apps to try and sandbox a developer and in doing so breaking perfectly secure means of client-server authorization (when done correctly). I have finally managed to get around the issue. As a result if you use cookies, there are settings and ways to mitigate the additional risks posed with using that choice. A Host API Key will also grant access to this level of authorization. Under allowed origins, 'http://localhost' is the only entry I have got. Your email address will not be published. I went down the path of removing all the CORS settings from the portal in order to use the CORS nuget packages in my service so that I could support .AllowCredentials(); as well as .SetIsOriginAllowedToAllowWildcardSubdomains();. https://shellmonger.com/2016/02/12/using-azure-app-service-authentication-with-a-web-application/. If a HTTP request is sent to the API, a 401 is returned. This flag makes it impossible for JavaScript to read the cookie value, even though that value is still sent to the server for authentication. alert(data) Update: Here's the exact error thrown by my browser even though the response is received in the "Network". Learn how your comment data is processed. This can also be done via the Azure Resource Explorer web interface. There is a lot of things to balance here, the argument isn't perfectly simple (for example, a non-httpOnly cookie is likely less secure than a token in localStorage). I think this highlights that token v. cookie, XSS is a severe threat for either, though I think XSS is a far better-understood problem compared to CSRF for example. Cookies on the other hand are vulnerable by default to CSRF since any web-browser will automatically add the cookie to a request destined for a given domain. Sorry for being late to the party. This is where you do the work to crack open the JWT and create the ClaimsPrinciple. ', //stackoverflow.com/questions/39215513/how-to-add-customer-http-header-in-response-from-azure-function, // (Excuse the custom code in Typescript). It's not just cookies. In any case, I think both transport mechanisms should be supported by Azure Functions/App Service but I'm just running into this now and not sure where things stand internally. The JWT middleware is configured to make all routes secure except for the authenticate route (/users/authenticate) which is publicly accessible. Cross origin http request CORS fails with response header missing 'Access-Control-Allow-Credentials: true', 'https://.azurewebsites.net/.auth/me. I close this issue for now, but it will be great if we can specify additional headers at the application level. We'll look into adding support for this. @nevercast I agree completely. A JWT token contains a Header, a Payload, and a Signature. Provision Azure Databricks Workspace Generate AAD Access Token. The AuthorizationLevel.Admin authorization can be set, if you require only a single API Key for all the functions in the deployment, or some clients have admin access to all the Functions. Thanks for the interesting write up, @securityvoid, and perhaps this isn't the place to continue a discussion on this, but if an XSS is found in your web app, then hijacking the Fetch/XML Request API used by the app and sending requests is still an equal threat, cookie or token, if you have an XSS vulnerability you should consider the entire account compromised on that domain. I'm still trying to get the code deployed correctly, but I'm pretty sure that was the real reason why I had the results. In this tutorial, we’re gonna build a Node.js & MongoDB example that supports User Authentication (Registation, Login) & Authorization with JSONWebToken (JWT). The text was updated successfully, but these errors were encountered: Have you tried enabling CORS via the Function App Settings? RequestUri=%s', req.originalUrl); f (req.query.name || (req.body && req.body.name)) { context.res = { // status: 200, /* Defaults to 200 */ body: {name: (req.query.name || req.body.name) } }; } else { context.res = { status: 400, body: "Please pass a name on the query string or in the request body" }; } context.res.headers = { 'Access-Control-Allow-Credentials' : 'true', 'Access-Control-Allow-Origin' : 'http://localhost', 'Access-Control-Allow-Origins' : 'http://localhost', 'Content-Type': 'application/json' }; context.done(); }; ` var request = new Request(url, { This would still limit the scope of where the credentials could be shared, but enable multi-tenant service scenarios. Note: There is no wildcard entry and I am getting an error in the portal that says, "CORS is not configured for this function app. https://feedback.azure.com/forums/169385-web-apps/suggestions/32371078-access-control-allow-credentials-not-set-in-creden. In any case, thank-you for re-opening the new feature request to get this into the product! I think the case has been made that this feature is needed. https://feedback.azure.com/forums/169385-web-apps-formerly-websites, Manual CORS headers in response message are stripped, Need to send "Origin" header when connecting from JavaScript to avoid CORS problems, Authenticated POST requests with well-known User-Agent string are rejected (403), https://feedback.azure.com/forums/169385-web-apps/suggestions/32371078-access-control-allow-credentials-not-set-in-creden, https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Credentials, Fix SignalRConnectionInfo to support negotiate. Since JavaScript has to be able to access and send the session token, this means that Cross-Site Scripting (XSS) (Should the vulnerability exist) will ALWAYS be able to access the session token. When I looked at this originally I was trying to allow an SPA to make a cross domain request to an API using a JWT bearer token in the Authorization header. Sure, if you use an httpOnly cookie, the cookie cannot be stolen and sent to a third party domain for abuse, but the abuse can take place directly in the victim's browser. NOTE: This library is now at version 5 and is published on npm as @auth0/angular-jwt.If you're looking for the pre-v1.0 version of this library, it can be found in the pre-v1.0 branch and on npm as angular2-jwt.. https://docs.microsoft.com/en-us/azure/azure-functions/security-concepts, https://docs.microsoft.com/en-us/azure/azure-functions/functions-bindings-http-webhook-trigger, Your email address will not be published. fyi the fix is live now! A Host Key can also be used to access an AuthorizationLevel.Function API. Azure Function - Javascript POST Call return 403. I'm closing this issue as it seems like the main ask has been handled. Getting bit bad by it :\, I posted this issue in the UserVoice as @lindydonna suggested: }); @safihamid Yes, of course, I was using proxies so it was unfortunate that I had to disable them because I could find no workaround for the CORS problem. Are you able to share an update? // 'Access-Control-Allow-Credentials': 'true', Azure/azure-functions-signalrservice-extension#20. mode:'cors' I would argue more that XSS is more difficult to mitigate than CSRF especially with the implementation of the SameSite cookie attribute and therefore choose cookies as the transport mechanism for such data. Integration of a serverless API with an existing infrastructure and an identity provider is a cost-effective step towards migrating to Azure Functions while keeping old services up and running. }); fetch(request) The workaround to remove all CORS in the portal no longer appeared to work. ajax - withCredentials). Add a new Function Key using the Function Keys blade. Would you consider allowing supportCredentials to work in conjunction with .SetIsOriginAllowedToAllowWildcardSubdomains();? "To enable this in App Service, set properties.cors.supportCredentials to true in your CORS config" It avoids querying the database more than once after a user is logged in and has been verified. The value of the 'Access-Control-Allow-Credentials' header in the response is '' which must be 'true' when the request's credentials mode is 'include'. The authorize middleware can be added to any route to restrict access to the route to authenticated users with specified roles. The Angular SPA cannot keep a secret, it is a public client. Developers can make mistakes about security, and they do quite often. You should only send API keys using HTTP headers and not in the URL as a parameter.