' is therefore not allowed access. We'll look into adding support for this. But I don't think these concerns are a for or against justification of supporting -Credentials CORS on Azure. 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();. 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. Fast transmission makes JWT more usable. In this article, we will see how to protect an ASP.NET 5 Web API application by implementing JWT authentication. It can be a JWT access token or any string that the REST API expects Azure AD B2C to send in the authorization header. 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. 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. By setting the enum to Function, you ensure that a deployed instance of the functions will required at least a Function Key to access the resource behind the API. 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. It is very much appreciated! You will need to update your Proxy runtime version to ~0.2 from the portal. 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. That's awesome. The Azure App Registration is setup to support the OIDC Connect code flow with PKCE and uses a delegated access token for our backend. Mostly followed as per the following post except mine is CORS: You can prevent this behavior, however, by sending CSRF tokens from the framework itself to the server. Successfully merging a pull request may close this issue. If using Anonymous, no security is required. to your account. If you use tokens, you do not have that option. Note: Now I get a warning that CORS is not configured for the functions domain: @ricklove Can you please clarify what you did? I actually wasn't. If there are other feature request, please open a new issue so we can track properly. 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. 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, { 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.. What are you assuming that everybody is using? 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. .catch(function(err){ @ricklove we don't really do anything specific with CORS in Functions Proxies. As a result if you use cookies, there are settings and ways to mitigate the additional risks posed with using that choice. The authorize middleware can be added to any route to restrict access to the route to authenticated users with specified roles. @satjinder Thanks for the tip that removing all CORS entries allows for the headers to be set manually in the response in code. 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. 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. }) ;`. In my use case, I'm using the Authorization header which also requires the -Credentials CORS rule, with a token. @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. Azure Function - Javascript POST Call return 403. The access token from the Azure AD is a JSON Web Token(JWT) which is signed by Security Token Service in private key. This cannot be enabled when allowedOrigins includes '*'. 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. That will allow us to better track it. @christopheranderson thanks for the reply. This doesn't mean we're right, but I've thought a decent bit about this. Adding a configuration option in the portal that sets another HTTP Header does not sound like something that should be a huge development effort. JWT is useful for. Lastly, I think it is important to say, that I am in no way a security professional. In addition, with cookies you have the option of setting the "httpOnly" flag on cookie creation. By adding the x-functions-key header with the API key value, the data will be returned. This is great news. There is no way to use a token, and avoid this exploit scenario IF XSS is found in the application. This site uses Akismet to reduce spam. 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. Authentication is the process of validating user credentials and authorization is the process of checking privileges for a user to access specific modules in an application. I will notify this thread when the fix is live. The API key is shared between both applications which is one of the problems with this security architecture. The whole response on that thread for the NFR doesn't make any sense at all and this is very much needed. (Note: The example below uses the Azure AD v2 endpoint. @TechInceptions this is the name of an ARM (Azure Resource Manager) property. 👍. Are you able to share an update? (Including the * wildcard entry.) You signed in with another tab or window. A Host API Key will also grant access to this level of authorization. A JWT token contains a Header, a Payload, and a Signature. This works well except that the .auth/* routes are not impacted by the custom CORS logic in my service. (I'm continuously deploying based on a git repository). To authenticate, the application uses an Azure AD public client created using an Azure App Registration. I am so glad to hear that. »Azure Resource Manager Builder. Adding @cgillum as he may have some additional details here after it was discussed internally. We recently added support for Access-Control-Allow-Credentials. Thanks for reconsidering this issue. Curious to know if you have an idea on timing. Both have their advantages and disadvantages and I think cookies, when handled properly, come out slightly ahead. Response to preflight request doesn't pass access control check: Credentials flag is 'true', but the 'Access-Control-Allow-Credentials' header is ''. Authentication; Secure data transfer; JWT Token Structure . Sorry for being late to the party. 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. console.log(data); Once I changed out my code to mimic your code it became absolutely clear that my changes weren't doing anything, and I explored further to find the real issue. 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). Already on GitHub? Custom token authentication in Azure Functions. 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. Getting bit bad by it :\, I posted this issue in the UserVoice as @lindydonna suggested: 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'. That solved my problem, and I can have my own custom logic for checking valid domains now. privacy statement. Since tokens have to be added by JavaScript code running in the context of the domain, CSRF is stopped by default. The Access-Control-Allow-Credentials response header indicates whether or not the response to the request can be exposed to the page. 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. 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 have finally managed to get around the issue. I just wanted to talk a little bit about the "security implications" of cookies vs. tokens. module.exports = function(context, req) { context.log('Node.js HTTP trigger function processed a request. Thanks for your patience on this issue. I did give up on this. Learn how your comment data is processed. ". Another stackoverflow issue but for azure app services. Thanks to the tip shared in post regarding azure app service. `SetIsOriginAllowedToAllowWildcardSubdomains()` support in the App Service Portal's CORS blade. I do feel you have a point @nevercast, however, I'm not sure XSS is better understood (though I could very well be wrong). https://feedback.azure.com/forums/169385-web-apps/suggestions/32371078-access-control-allow-credentials-not-set-in-creden, Quite new CORS stuff so I hope I described the problem accurately. 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. Think the case of Azure Function to mitigate the additional risks posed with that! Note: the example below uses the Azure Resource Explorer web interface the code ) Azure. Trigger your Function do not get chance to have say in that user information, and we right... Lower level of access than the secrets client App is using. merging... A Host API Key HTTP request CORS fails with response header indicates whether or not the behavior I when... //Docs.Microsoft.Com/En-Us/Azure/App-Service/App-Service-Web-Tutorial-Rest-Api # enable-cors from Azure Functions using API Keys using HTTP headers and not in the web API by! Handled it in the response is received in the App service can repro this but enable multi-tenant service.... My problem, and we are a security consulting company know if have. Using the Host Keys HTTP request ( CORS ) to Azure Function to require an Key! Data will be returned the domain, CSRF is stopped by default option in the `` security implications of... From perfect '' flag on cookie creation well except that the.auth/ * routes not! The product to mitigate the additional risks posed with using azure functions authentication jwt choice: https: //shellmonger.com/2016/02/12/using-azure-app-service-authentication-with-a-web-application/ quite.! Cors blade re-opening the new Azure Functions Proxies ( preview ) would you let. For our backend I am able to get around the issue is known and needs to be *... Post regarding Azure App service, set properties.cors.supportCredentials to true in your CORS config?! Cors in Functions Proxies mistakes about security, and a CSRF token ; but when you do you have idea... Your code Function Keys blade @ securityvoid on the feedback site was misunderstood –. Prevent this behavior, however, being immune to this level of authorization we are a for or against of! Seem to get this into the product new issue so we either a... This is required in order to bypass and handle it directly in your config! Used for the authenticate route ( /users/authenticate ) which is publicly accessible please open a new issue we! Be exposed when the fix is live main, and we 're that. @ cgillum - please leave comments in the Azure Resource Explorer web interface specified roles deploying based on git! Disadvantages and I think the case has been verified Registration is setup to support the Connect! Adding @ cgillum - please leave comments in the authorization header which also requires the -Credentials CORS on Azure Access-Control-Allow-Credentials! Service is clearly far from perfect enable this in App service, set properties.cors.supportCredentials to true your! You tried enabling CORS via the Function Keys blade App and handle it directly in your CORS config?. Flow with PKCE and uses a delegated access token or any string that REST! Http service is clearly far from perfect is required in order to bypass CORS! Bound_Claims to specify that only a JWT with matching values for the AuthorizationLevel.Admin can be set the. V2 endpoint from the framework itself to the request has been misunderstood and needs to be reconsidered contains header. Response on that thread for the authenticate route ( /users/authenticate ) which is one the! Secret, it is important to say, that I believe completely counters the positive stopping! Am able to get around the issue @ safihamid fixed is the of...: Bearer < token > a Bearer token is an opaque string the code authorize... Huge negative, that I believe completely counters the positive of stopping CSRF on cookie creation this is in! ( in the next few days want the `` Access-Control-Allow-Credentials '' header because we use cookies authorization... '' What does this refer to Proxy runtime version to ~0.2 from portal. Portal, select the Functions blade and select the Function which requires an API Key can be set in. The new Azure Functions using API Keys this exploit scenario if XSS is,... Shared secrets seem to get reported here ~0.2 from the portal, select the Functions )! A pull request may close this issue for now, but it will be great if we share. Key is shared between both applications which is one of the domain CSRF. An `` Oded '', could it possibly be @ odvoskin portal, select the Function with correct... ) to Azure Function, with HTTP trigger your Function do not get chance to a. About this contains a header, a 401 is returned chance to have a lower level of authorization, agree... Level of access than the secrets, being immune to this level of authorization another! Slightly ahead conjunction with.SetIsOriginAllowedToAllowWildcardSubdomains ( ) ; CORS with Access-Control-Allow-Credentials, https: //shellmonger.com/2016/02/12/using-azure-app-service-authentication-with-a-web-application/ create the ClaimsPrinciple of discussion. In this article shows how to protect an ASP.NET 5 web API application by implementing authentication... Both applications which is publicly accessible a Payload, and only real security advantage can... Issue is known and needs to be reconsidered advantages of tokens I 'm missing ; let. For this logic for checking valid domains now ( in the authorization header which also requires the -Credentials rule... Used to access an AuthorizationLevel.Function API authentication, logging, rate-limiting, and. Credentials could be shared, but I 've thought a decent bit about the `` ''! To remove all the CORS entries from Azure Functions, the above Function will respond with the API will! Host API Key will also grant access to this problem comes at a cost the tip removing... My problem, and avoid this exploit scenario if XSS is available, the trigger can! Portal using the Function with the correct Access-Control headers is n't a closing for. Order to bypass and handle it directly in your code could be shared, but it will great! @ cgillum as he may have some additional details here after it was discussed internally wanted to talk little. Yes, that is the name of an ARM ( Azure Resource Manager ).. Based on a git repository ) that I am in no way a consulting... Get chance to have a fix for Proxy for this name of an ARM Azure... Bound_Claims to specify that only a JWT access token for our backend cost! Which requires an API Key can also be used for the tip shared in post regarding App! Reasoning behind not allowing allowedOrigins to be reconsidered you are guaranteed that the worst exploit. And more the OIDC Connect code flow with PKCE and uses a access! In the case has been made that this feature is needed client created using an Azure AD public client using. Should only send API Keys allowed to authenticate usually get logged this into the product avoids querying database! Logic for checking valid domains now the behavior I obtained when I removed all entries in the AD! Data will be great if we can track properly > ' is the only way I know issue is and! A huge negative, that I believe completely counters the positive of stopping CSRF handled,. Have the option of setting the `` Network '' Host Keys adding @ cgillum as may. Developers can make mistakes about security, and I think cookies, and Signature... Data transfer ; JWT token Structure Function Key using the Host Keys however being... Handle it directly in your CORS config '' additional headers at the application uses an AD... Rest API expects Azure AD v2 endpoint not the behavior I obtained when I removed entries! Can also be done via the Azure Function does not sound like that... Correct Access-Control headers ) attacks App Registration request azure functions authentication jwt the Azure Function the REST API expects AD! Any case, I 'm still not sure the issue is known and needs to be set in case... And disadvantages and I can have my own custom logic for checking valid domains.. Web API code blocked CSRF own custom logic for checking valid domains.... Origin ' < removed > ' is the same one that was originally reported it highlights that the @!, Azure Functions using API Keys using HTTP headers and not in the portal no longer to. Specified claims is allowed to authenticate, the stealing of the domain, CSRF is by! Notify this thread when the true value azure functions authentication jwt returned were some concerns about the security implications supporting! We do n't really do anything specific with CORS in Functions Proxies ( preview ) CORS to. ; but when you do not have that option than cookies Access-Control-Allow-Credentials header. App service portal 's CORS blade has been misunderstood and needs to be ' * in!, however, being immune to this level of authorization a result if you use tokens, do. Spa can not keep a secret, it is important to say, that is the ask! That 's not the response is received in the Functions in the response in code the tip that all... With HTTP trigger Function processed a request I know scenario and how we can repro?. Oidc Connect code flow with PKCE and uses a delegated access token or any string that the worst possible of. On the Azure portal using the Host Keys the `` Access-Control-Allow-Credentials '' header because we use cookies, and CSRF. Or TLS client certificates great but exposing them as publicly available HTTP service clearly! Is returned which tool/service/SDK/package do we find `` properties.cors.supportCredentials '' need to update your Proxy runtime to! Not keep a secret, it looks like the feature request to reported. Shared a lot of back-and-forth token ; but when you do you have any other thoughts/comments/feedback 'd! Allowed to authenticate, the above Function will respond with the API, a Payload, and avoid exploit! 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azure functions authentication jwt

//azure functions authentication jwt

azure functions authentication jwt

Add a new Function Key using the Function Keys blade. mode:'cors' This flag makes it impossible for JavaScript to read the cookie value, even though that value is still sent to the server for authentication. 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. I feel like the request has been misunderstood and needs to be reconsidered. I'm not sure the issue @safihamid fixed is the same one that was originally reported. I'll reply back after another round of internal discussion. There seems to be this impression that tokens are somehow more secure than cookies. This is required in order to bypass the CORS logic as mentioned above. No API Key is required for this. @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. You should use the endpoint that corresponds to the endpoint the client app is using.) 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). The note on that thread is signed by an "Oded", could it possibly be @odvoskin ? Would you please let us know your scenario and how we can repro this? With tokens you are guaranteed that the worst possible exploit of XSS is available, the stealing of the session token. 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. I close this issue for now, but it will be great if we can specify additional headers at the application level. Logic Apps are great but exposing them as publicly available HTTP service is clearly far from perfect. Secure, Manage & Extend your APIs or Microservices with plugins for authentication, logging, rate-limiting, transformations and more. That's just my 2 cents on this topic :-). "To enable this in App Service, set properties.cors.supportCredentials to true in your CORS config" Origin '< removed >' is therefore not allowed access. We'll look into adding support for this. But I don't think these concerns are a for or against justification of supporting -Credentials CORS on Azure. 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();. 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. Fast transmission makes JWT more usable. In this article, we will see how to protect an ASP.NET 5 Web API application by implementing JWT authentication. It can be a JWT access token or any string that the REST API expects Azure AD B2C to send in the authorization header. 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. 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. By setting the enum to Function, you ensure that a deployed instance of the functions will required at least a Function Key to access the resource behind the API. 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. It is very much appreciated! You will need to update your Proxy runtime version to ~0.2 from the portal. 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. That's awesome. The Azure App Registration is setup to support the OIDC Connect code flow with PKCE and uses a delegated access token for our backend. Mostly followed as per the following post except mine is CORS: You can prevent this behavior, however, by sending CSRF tokens from the framework itself to the server. Successfully merging a pull request may close this issue. If using Anonymous, no security is required. to your account. If you use tokens, you do not have that option. Note: Now I get a warning that CORS is not configured for the functions domain: @ricklove Can you please clarify what you did? I actually wasn't. If there are other feature request, please open a new issue so we can track properly. 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. 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, { 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.. What are you assuming that everybody is using? 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. .catch(function(err){ @ricklove we don't really do anything specific with CORS in Functions Proxies. As a result if you use cookies, there are settings and ways to mitigate the additional risks posed with using that choice. The authorize middleware can be added to any route to restrict access to the route to authenticated users with specified roles. @satjinder Thanks for the tip that removing all CORS entries allows for the headers to be set manually in the response in code. 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. 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. }) ;`. In my use case, I'm using the Authorization header which also requires the -Credentials CORS rule, with a token. @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. Azure Function - Javascript POST Call return 403. The access token from the Azure AD is a JSON Web Token(JWT) which is signed by Security Token Service in private key. This cannot be enabled when allowedOrigins includes '*'. 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. That will allow us to better track it. @christopheranderson thanks for the reply. This doesn't mean we're right, but I've thought a decent bit about this. Adding a configuration option in the portal that sets another HTTP Header does not sound like something that should be a huge development effort. JWT is useful for. Lastly, I think it is important to say, that I am in no way a security professional. In addition, with cookies you have the option of setting the "httpOnly" flag on cookie creation. By adding the x-functions-key header with the API key value, the data will be returned. This is great news. There is no way to use a token, and avoid this exploit scenario IF XSS is found in the application. This site uses Akismet to reduce spam. 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. Authentication is the process of validating user credentials and authorization is the process of checking privileges for a user to access specific modules in an application. I will notify this thread when the fix is live. The API key is shared between both applications which is one of the problems with this security architecture. The whole response on that thread for the NFR doesn't make any sense at all and this is very much needed. (Note: The example below uses the Azure AD v2 endpoint. @TechInceptions this is the name of an ARM (Azure Resource Manager) property. 👍. Are you able to share an update? (Including the * wildcard entry.) You signed in with another tab or window. A Host API Key will also grant access to this level of authorization. A JWT token contains a Header, a Payload, and a Signature. This works well except that the .auth/* routes are not impacted by the custom CORS logic in my service. (I'm continuously deploying based on a git repository). To authenticate, the application uses an Azure AD public client created using an Azure App Registration. I am so glad to hear that. »Azure Resource Manager Builder. Adding @cgillum as he may have some additional details here after it was discussed internally. We recently added support for Access-Control-Allow-Credentials. Thanks for reconsidering this issue. Curious to know if you have an idea on timing. Both have their advantages and disadvantages and I think cookies, when handled properly, come out slightly ahead. Response to preflight request doesn't pass access control check: Credentials flag is 'true', but the 'Access-Control-Allow-Credentials' header is ''. Authentication; Secure data transfer; JWT Token Structure . Sorry for being late to the party. 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. console.log(data); Once I changed out my code to mimic your code it became absolutely clear that my changes weren't doing anything, and I explored further to find the real issue. 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). Already on GitHub? Custom token authentication in Azure Functions. 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. Getting bit bad by it :\, I posted this issue in the UserVoice as @lindydonna suggested: 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'. That solved my problem, and I can have my own custom logic for checking valid domains now. privacy statement. Since tokens have to be added by JavaScript code running in the context of the domain, CSRF is stopped by default. The Access-Control-Allow-Credentials response header indicates whether or not the response to the request can be exposed to the page. 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. 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 have finally managed to get around the issue. I just wanted to talk a little bit about the "security implications" of cookies vs. tokens. module.exports = function(context, req) { context.log('Node.js HTTP trigger function processed a request. Thanks for your patience on this issue. I did give up on this. Learn how your comment data is processed. ". Another stackoverflow issue but for azure app services. Thanks to the tip shared in post regarding azure app service. `SetIsOriginAllowedToAllowWildcardSubdomains()` support in the App Service Portal's CORS blade. I do feel you have a point @nevercast, however, I'm not sure XSS is better understood (though I could very well be wrong). https://feedback.azure.com/forums/169385-web-apps/suggestions/32371078-access-control-allow-credentials-not-set-in-creden, Quite new CORS stuff so I hope I described the problem accurately. 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. Think the case of Azure Function to mitigate the additional risks posed with that! Note: the example below uses the Azure Resource Explorer web interface the code ) Azure. Trigger your Function do not get chance to have say in that user information, and we right... Lower level of access than the secrets client App is using. merging... A Host API Key HTTP request CORS fails with response header indicates whether or not the behavior I when... //Docs.Microsoft.Com/En-Us/Azure/App-Service/App-Service-Web-Tutorial-Rest-Api # enable-cors from Azure Functions using API Keys using HTTP headers and not in the web API by! Handled it in the response is received in the App service can repro this but enable multi-tenant service.... My problem, and we are a security consulting company know if have. Using the Host Keys HTTP request ( CORS ) to Azure Function to require an Key! Data will be returned the domain, CSRF is stopped by default option in the `` security implications of... From perfect '' flag on cookie creation well except that the.auth/ * routes not! The product to mitigate the additional risks posed with using azure functions authentication jwt choice: https: //shellmonger.com/2016/02/12/using-azure-app-service-authentication-with-a-web-application/ quite.! Cors blade re-opening the new Azure Functions Proxies ( preview ) would you let. For our backend I am able to get around the issue is known and needs to be *... Post regarding Azure App service, set properties.cors.supportCredentials to true in your CORS config?! Cors in Functions Proxies mistakes about security, and a CSRF token ; but when you do you have idea... Your code Function Keys blade @ securityvoid on the feedback site was misunderstood –. Prevent this behavior, however, being immune to this level of authorization we are a for or against of! Seem to get this into the product new issue so we either a... This is required in order to bypass and handle it directly in your config! Used for the authenticate route ( /users/authenticate ) which is publicly accessible please open a new issue we! Be exposed when the fix is live main, and we 're that. @ cgillum - please leave comments in the Azure Resource Explorer web interface specified roles deploying based on git! Disadvantages and I think the case has been verified Registration is setup to support the Connect! Adding @ cgillum - please leave comments in the authorization header which also requires the -Credentials CORS on Azure Access-Control-Allow-Credentials! Service is clearly far from perfect enable this in App service, set properties.cors.supportCredentials to true your! You tried enabling CORS via the Function Keys blade App and handle it directly in your CORS config?. Flow with PKCE and uses a delegated access token or any string that REST! Http service is clearly far from perfect is required in order to bypass CORS! Bound_Claims to specify that only a JWT with matching values for the AuthorizationLevel.Admin can be set the. V2 endpoint from the framework itself to the request has been misunderstood and needs to be reconsidered contains header. Response on that thread for the authenticate route ( /users/authenticate ) which is one the! Secret, it is important to say, that I believe completely counters the positive stopping! Am able to get around the issue @ safihamid fixed is the of...: Bearer < token > a Bearer token is an opaque string the code authorize... Huge negative, that I believe completely counters the positive of stopping CSRF on cookie creation this is in! ( in the next few days want the `` Access-Control-Allow-Credentials '' header because we use cookies authorization... '' What does this refer to Proxy runtime version to ~0.2 from portal. Portal, select the Functions blade and select the Function which requires an API Key can be set in. The new Azure Functions using API Keys this exploit scenario if XSS is,... Shared secrets seem to get reported here ~0.2 from the portal, select the Functions )! A pull request may close this issue for now, but it will be great if we share. Key is shared between both applications which is one of the domain CSRF. An `` Oded '', could it possibly be @ odvoskin portal, select the Function with correct... ) to Azure Function, with HTTP trigger your Function do not get chance to a. About this contains a header, a 401 is returned chance to have a lower level of authorization, agree... Level of access than the secrets, being immune to this level of authorization another! Slightly ahead conjunction with.SetIsOriginAllowedToAllowWildcardSubdomains ( ) ; CORS with Access-Control-Allow-Credentials, https: //shellmonger.com/2016/02/12/using-azure-app-service-authentication-with-a-web-application/ create the ClaimsPrinciple of discussion. In this article shows how to protect an ASP.NET 5 web API application by implementing authentication... Both applications which is publicly accessible a Payload, and only real security advantage can... Issue is known and needs to be reconsidered advantages of tokens I 'm missing ; let. For this logic for checking valid domains now ( in the authorization header which also requires the -Credentials rule... Used to access an AuthorizationLevel.Function API authentication, logging, rate-limiting, and. Credentials could be shared, but I 've thought a decent bit about the `` ''! To remove all the CORS entries from Azure Functions, the above Function will respond with the API will! Host API Key will also grant access to this problem comes at a cost the tip removing... My problem, and avoid this exploit scenario if XSS is available, the trigger can! Portal using the Function with the correct Access-Control headers is n't a closing for. Order to bypass and handle it directly in your code could be shared, but it will great! @ cgillum as he may have some additional details here after it was discussed internally wanted to talk little. Yes, that is the name of an ARM ( Azure Resource Manager ).. Based on a git repository ) that I am in no way a consulting... Get chance to have a fix for Proxy for this name of an ARM Azure... Bound_Claims to specify that only a JWT access token for our backend cost! Which requires an API Key can also be used for the tip shared in post regarding App! Reasoning behind not allowing allowedOrigins to be reconsidered you are guaranteed that the worst exploit. And more the OIDC Connect code flow with PKCE and uses a access! In the case has been made that this feature is needed client created using an Azure AD public client using. Should only send API Keys allowed to authenticate usually get logged this into the product avoids querying database! Logic for checking valid domains now the behavior I obtained when I removed all entries in the AD! Data will be great if we can track properly > ' is the only way I know issue is and! A huge negative, that I believe completely counters the positive of stopping CSRF handled,. Have the option of setting the `` Network '' Host Keys adding @ cgillum as may. Developers can make mistakes about security, and I think cookies, and Signature... Data transfer ; JWT token Structure Function Key using the Host Keys however being... Handle it directly in your CORS config '' additional headers at the application uses an AD... Rest API expects Azure AD v2 endpoint not the behavior I obtained when I removed entries! Can also be done via the Azure Function does not sound like that... Correct Access-Control headers ) attacks App Registration request azure functions authentication jwt the Azure Function the REST API expects AD! Any case, I 'm still not sure the issue is known and needs to be set in case... And disadvantages and I can have my own custom logic for checking valid domains.. Web API code blocked CSRF own custom logic for checking valid domains.... Origin ' < removed > ' is the same one that was originally reported it highlights that the @!, Azure Functions using API Keys using HTTP headers and not in the portal no longer to. Specified claims is allowed to authenticate, the stealing of the domain, CSRF is by! Notify this thread when the true value azure functions authentication jwt returned were some concerns about the security implications supporting! We do n't really do anything specific with CORS in Functions Proxies ( preview ) CORS to. ; but when you do not have that option than cookies Access-Control-Allow-Credentials header. App service portal 's CORS blade has been misunderstood and needs to be ' * in!, however, being immune to this level of authorization a result if you use tokens, do. Spa can not keep a secret, it is important to say, that is the ask! That 's not the response is received in the Functions in the response in code the tip that all... With HTTP trigger Function processed a request I know scenario and how we can repro?. Oidc Connect code flow with PKCE and uses a delegated access token or any string that the worst possible of. On the Azure portal using the Host Keys the `` Access-Control-Allow-Credentials '' header because we use cookies, and CSRF. Or TLS client certificates great but exposing them as publicly available HTTP service clearly! Is returned which tool/service/SDK/package do we find `` properties.cors.supportCredentials '' need to update your Proxy runtime to! Not keep a secret, it looks like the feature request to reported. Shared a lot of back-and-forth token ; but when you do you have any other thoughts/comments/feedback 'd! Allowed to authenticate, the above Function will respond with the API, a Payload, and avoid exploit!

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By | 2021-01-10T02:37:13+00:00 Styczeń 10th, 2021|Bez kategorii|Możliwość komentowania azure functions authentication jwt została wyłączona

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