I want to implement client certificate validation in Azure API Management policy to check if the client has a valid certificate as per the below documentation.
https://learn.microsoft.com/en-us/azure/api-management/api-management-howto-mutual-certificates-for-clients
I have Application gateway in front of API Management service deployed in internal mode connected to vnet.
I have the same issue as mentioned in the below artile. The certificate is not being passed down to the APIM.
Client Certificate is not being passed on by Azure Application Gateway
I see that there is support for Mutual Authentication with application gateway in preview mode. Is this the only possible option to fix this issue. Any timelines on the release for this feature on v1 application gateways.
https://learn.microsoft.com/en-us/azure/application-gateway/mutual-authentication-overview
Will the certificate be passed to APIM gateway to validate the client certificate with this feature enabled.
My APIM policy works fine when the traffic is coming to the internal endpoint when I try to access the API from within the network. This route doesnt pass through Application gateway in our setup and works fine. But having trouble getting the external access enabled with client certificates
"Will the certificate be passed to APIM gateway to validate the client certificate with this feature enabled" - no, it won't.
An answer from Microsoft:
We do have option for mutual authentication on Application Gateway
which can allow the mutual authentication between client and
Application Gateway:
https://learn.microsoft.com/en-us/azure/application-gateway/mutual-authentication-overview
However this is still in preview version, which is not included in
SLA. As the mutual authentication between AppGW and the APIM we
double confirmed with the backend engineers, unfortunately the answer
is no we do not support such a function.
Related
I have been looking at various tutorials demoing how identity management works as well as API management in azure but I am not seeing an answer to my questions. I understand that managed identities can be used to authorize azure resource to resource communication but I am not seeing how this is done for a web application. Say for example I have an angular website being hosted on an nginx server in an AKS cluster. I understand that I could use Identity management to create Identity resources that make it so that the AKS and APIM are authorized to connect with one another but how would I do this for the angular running application? This application is running in the client's browser, so it seems like this identity management mechanism would not work. How does one secure an APIM so only a given web application can interact with it?
You could secure your API in APIM with the client certificate, then when the app access the API, validate the incoming certificate and check certificate properties against desired values using policy expressions.
For more details, see How to secure APIs using client certificate authentication in API Management.
I have Azure API Management, configured internally and exposed to the public through Azure application Gateway. My API is secured for client certificates, it working perfectly when I test it internally. When I test it externally, I am getting an invalid certificate error. Does Azure Application Gateway block client certificates? How to allow them?
An answer from Microsoft:
We do have option for mutual authentication on Application Gateway
which can allow the mutual authentication between client and
Application Gateway:
https://learn.microsoft.com/en-us/azure/application-gateway/mutual-authentication-overview
However this is still in preview version, which is not included in
SLA. As the mutual authentication between AppGW and the APIM we
double confirmed with the backend engineers, unfortunately the answer
is no we do not support such a function.
I suspect this is not yet possible with Application Gateway: https://feedback.azure.com/forums/217313-networking/suggestions/9379902-allow-mutual-ssl-auth-on-application-gateway
I have created the Azure Application Gateway with HTTPS backend.
The problem here is the health check is showed healthily.
But when I connect to Application Gateway it returns 502
I check directly to the backend server but it still fine. HTTP Backend works fine also, only self-signed HTTPS backend got the problem.
Do you have any idea or troubleshooting way for this?
This could happen in the scenario that AppGW v2 when the client receives 502 through the Application Gateway when the back-end is Healthy and no Request Time-Outs.
You could first check these common scenarios, Also you could consider two cases of the health probe.
Default Probe:
AppGW v2 will always show the back-end as healthy when the probe used is the default. So ALWAYS verify if the back-end is really healthy.
Custom Probe:
In this case, the AppGW v2 is supposed to be showing the right health of the back-end.
Furthermore, Authentication Certificates have been deprecated and replaced by Trusted Root Certificates in the Application Gateway v2 SKU. Read more details here.
If the certificate is self-signed, or signed by unknown
intermediaries, then to enable end to end SSL in v2 SKU a trusted root
certificate must be defined. Application Gateway will only communicate
with backends whose Server certificate’s root certificate matches one
of the list of trusted root certificates in the backend http setting
associated with the pool.
Note
The self-signed certificate must be a part of a certificate chain. A
single self-signed certificate with no chain is not supported in V2
SKU.
You can also check if the back-end returns the complete chain of Certs to AppGW via any of the SSL Checkers Online: https://www.sslshopper.com/ssl-checker.html
More references:
Generate an Azure Application Gateway self-signed certificate with a custom root CA
Create certificates to allow the backend with Azure Application Gateway
I have a WebApp in Azure, which has incoming certificate enabled in place. Is it possible to check the endpoint of the API hosted in the WebApp through Traffic Manager probe? I cannot find a solution to probe the endpoint from there since it returns 403 "Error 403 - Forbidden: Client Certificate Required."
It's not possible to validate the client certificate via Traffic Manager probe referring to this official document. Traffic Manager supports probing over HTTPS. But please note that Traffic manager cannot provide any certificate validation, including:
Server-side certificates are not validated
SNI server-side certificates are not validated
Client certificates are not supported
For HTTP or HTTPS monitoring protocol, a common practice on the endpoint side is to implement a custom page within your application - for example, /health.aspx. Using this path for monitoring, you can perform application-specific checks, such as checking performance counters or verifying database availability. Based on these custom checks, the page returns an appropriate HTTP status code.
https://learn.microsoft.com/en-us/azure/traffic-manager/traffic-manager-monitoring
I am playing around with Azure API Management as a SOAP passthrough. I was hoping to get some analytics in place to preview the service.
My trouble is that my client endpoint has SSL validation in place. I can't figure out how to load the .cer file in Azure to satisfy this requirement. At the very least I was hoping to find an option to turn off SSL validation (like I can with curl or even postman).
any one found a way to accomplish this?
API Management provides the capability to secure access to the back-end service of an API using client certificates. Below guide shows how to manage certificates in the API publisher portal, and how to configure an API to use a certificate to access its back-end service.
How to secure back-end services using client certificate authentication in Azure API Management
If you are calling the API Management service with https then the certificate that is presented will match the host name that you are calling with. I'm assuming you were able to change the client to point to your service at https://{servicename}.azure-api.net ?
Or did you change your local hostname file to make that happen? If that's the case, then that is why you are getting an SSL error. Without being able to re-compile your client you cannot disable the SSL validation.
You could configure the custom domain in API Management and if you have access to the certificate, you could attach it to the custom domain. However, you would actually have to change the public DNS for the domain to make that work. I don't think you can enable a custom domain in API Management, provide the certificate and only use your local hostname file to do the mapping. But I will check.
The steps under 'Scenario 7: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel' in Troubleshooting 4xx and 5xx Errors with Azure APIM services is what worked for me. I'm using this approach to bypass validating the SSL cert until I switch from using a self-signed cert to a CA signed one.