I'm getting 403 Forbidden error when hitting Azure Functions via API Management. Just to be clear, I don't have any Authentication/Authorization in the function but Authorization Level is set to Function Level.
I can hit the function directly using the Function key.
I can also hit the API Management and getting response when mocking was enabled so the error is coming out of the function. I can verify that the function key is being passed by API management to the backend function.
Noticed that this only happens when the function was deployed using ARM.
Our Azure Function was deployed with IP restrictions and APIM IP was not present there. After adding APIM IP address thru Function's Platform Features > Networking Group > Networking > Configure IP Restriction, 403 errors were gone.
Related
I have the frontend and backend on cloud run, each whit his own service, but when I put "internal traffic" on the backend API, It doesn't work, give me 403 since the frontend and it is another service of the same project, and in the documentation says that internal means "only for the same project" so...
two services since the same project are not internal traffic?
I think that is because I use a custom domain and not the exact URL of the service but I am not sure because here says that the custom domains are allowed too.
So what do I have to do to auth my frontend service on cloud run?
I tried whit JWT auth, but there is a better option, isn't it
Cloud Run services set to internal only accepts traffic coming from the VPC network. In order to connect to a Cloud Run service that's serving internal traffic, the connecting service must be attached to a VPC connector. In this case, you need to setup Serverless VPC access connector as mentioned in this note:
For requests from other Cloud Run services or from Cloud Functions in the same project, connect the service or function to a VPC network and route all egress through the connector, as described in Connecting to a VPC network. Note that the IAM invoker permission is still enforced.
For authenticating between service-to-service, you can simply fetch an ID token from the Compute medatada server. You can do that on any GCP compute environment (Cloud Run, App Engine, Compute Engine, etc.). You can follow the steps provided in this documentation.
two services since the same project are not internal traffic?
Two services in the same project should be considered as internal traffic.
I believe what you need to do is follow the authentication steps with token as recommended here (service to service authentication):
https://cloud.google.com/run/docs/authenticating/service-to-service
https://cloud.google.com/run/docs/securing/service-identity#per-service-identity
Please note that even though you've set the ingress traffic to internal, the IAM role cloud run invoker is still needed for the service account.
I am getting error while accessing the Azure App Service, can you help in resolving the issue ?
What setting to be applied to resolve the issue ?
Thanks in advance.
This error comes either
When the public access is not allowed on Azure App Service, if you have open public API.
The IP of your application with which you are calling the app service is not whitelisted.
If you have any gateway in between then that may also be blocking your calls.
Solutions to try:
Try removing the access restrictions from Networking page of your web app.
Try giving the access to all by adding 0.0.0.0/0. Later you can add restrictions based on your requirements.
The sequence of the restrictions matters, so please check that once. If you have any blocked call before any allowed call, then it may impact.
You can also have restrictions based on http-headers like X-Forwarded-For. Please check that once. This can happen from code as well, based on how you handle the errors. Link
If your API is behind the Gateway, then you can check this: Application Gateway integration with service endpoints
Are you the developer of this website?
If you are, please navigate to Networking page of your web app, check the Access Restrictions.
If you are not the developer, just contact your administrator and allow your ip to access this website.
For more information, see Azure App Service access restrictions.
We are working on Azure.
To secure our API's we have APIM in front of it. We have App Registration based security policy on APIM to secure our API's for external world users. In the policy list we have added api1.azurewebsites.net;api2.azurewebsites.net;api3.azurewebsites.net domain entries so if api1 is calling api 2 it is allowed.
We also have a functionapp with c# .netcore code and it is calling api 3 but get 401 error. We added functionalapp domain in the above list but still access is denied.
How to resolve this please?
I am trying to create an API Management service that's within an external virtual network and using an Azure Function App as the backend. The virtual network is set up to allow only a specific range of IP addresses in, and I've set up the outbound rules as per this document.
Unfortunately when I try to hit the endpoint surfaced by API Management through the portal, I receive the following HTTP response:
HTTP/1.1 400 Bad Request
content-length: 53
vary: Origin
content-type: application/json
{
"error": "Unable to connect to the remote server"
}
If I hit the API Management request URL with curl I get a 404 response but no body. If I hit a URL that's not actually part of the API Management service, I get a 404 response with a proper body.
If I hit the endpoint surfaced by the Function App I get the response I expect, so that at least is working well.
I've even gone so far as to completely open up the Network Security Group on the virtual network to allow all traffic inbound and outbound and that has no effect.
Is it even possible to use a virtual network to restrict access to an API Management service backed by a Function App in this way? If so, how?
I have a backend API that is hosted in Azure app service. I want to use Azure API management as the front end to this backend API and have successfully configured this in Azure. I have configured API management to use OAuth when accessing this backend API which works when clients access the API through the Azure API management endpoints, but how do I prevent people from accessing the backend API endpoints directly so that only calls from the API management endpoints are allowed?
There are a few options of various levels of security:
Shared secret - set a certain header with a certain value in APIM and check that value at your backend.
Managed identity - you can enable managed identity in APIM service and send its token to your backend where you'll be able to validate it.
IP filter - check for APIM IP as a source at backend.
Client certificate auth - upload a client cert auth to APIM and attach it to every request to backend. Check for that cert at backend.
VNET - put APIM and your backend into same VNET and block access from outside to backend.
I've personally used IP restrictions to great success. APIM is given a static IP, so you can setup an IP restriction in the "root API" that allows only the APIM calls. This results in a 403 if you call the root API directly.
If you don't want a 403 coming from the root API, you can use policies to change that, or you can setup authentication at the APIM level and you'll get a 401 before even hitting that 403.