AccessControl policy runtime error troubleshooting

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IPDeniedAccess

Error code

accesscontrol.IPDeniedAccess

Error response body

{
    "fault": {
        "faultstring": "Access Denied for client ip : client_IP",
        "detail": {
            "errorcode": "accesscontrol.IPDeniedAccess"
        }
    }
}

Example error message

{
    "fault": {
        "faultstring": "Access Denied for client ip : 104.132.196.83",
        "detail": {
            "errorcode": "accesscontrol.IPDeniedAccess"
        }
    }
}

Cause

This error occurs if the client IP address, or any IP address passed as part of the API request, matches any IP address(es) specified in the <SourceAddress> element within the <MatchRule> element of the Access Control Policy, and the action attribute of the <MatchRule> element is set to DENY.

For example, let's say the <SourceAddress> is defined as shown below:

<SourceAddress mask="32">104.132.196.83</SourceAddress>

If the above IP address matches the IP address of the client system (indicated by the variable proxy.client.ip), or any of the IP addresses passed as part of the API request, the error will occur.

Diagnosis

Identify the IP address(es) denied access for a specific API request. You can find this information in the faultstring element of the error response.

For example, in the following faultstring, the IP address is 104.132.196.83:
```
"faultstring": "Access Denied for client ip : 104.132.196.83"
```

Examine all the Access Control policies in the failed API Proxy and determine the specific policy where the IP address(es) specified in the <SourceAddress> element matches the IP address(es) identified in the faultstring (Step 1 above).

For example, the following policy defines the <SourceAddress> IP as 104.132.196.83, which matches what is in the faultstring:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
    <AccessControl async="false" continueOnError="false" enabled="true" name="Access-Control">
    <DisplayName>Access-Control</DisplayName>
    <Properties/>
    <IPRules noRuleMatchAction="ALLOW">
        <MatchRule action="DENY">
            <SourceAddress mask="32">104.132.196.83</SourceAddress>
        </MatchRule>
    </IPRules>
    </AccessControl>

Determine the IP address(es) from which the API request was made. This can be done in multiple ways:
1. Using UI Trace
  1. Capture the trace for the failing API request.
  2. Select the specific Access Control Policy that has failed from the right hand panel.
  3. Check the value of the variable proxy.client.ip as shown in the following screenshot of a sample trace.
  4. If the proxy.client.ip is not listed, then check the value of the X-Forwarded-For or True-Client-IP message headers.
2. Using Custom Reports
  
  You can create Custom Reports to determine whether a 403 status code was thrown during the execution of the Access Control policy within the API proxy and also determine the client IP address. This is particularly useful if the issue has occurred in the past or if the issue is intermittent and you are unable to capture the trace in UI.
  
  Refer to Create and manage custom reports to understand how to create custom reports. In the custom report, choose:
  1. Sum of Traffic as a Metric, and
  2. Proxy, Response Status Code, Proxy Client IP and X-Forwarded-For as Dimensions.
  This should help you to determine the client IP or IP addresses passed that led to the error.
If the client IP address (indicated by the variable proxy.client.ip), or any IP address passed as part of the API request, matches the IP address(es) specified in the <SourceAddress> element within the <MatchRule> element of Access Control Policy, where the action attribute is set to DENY, then that is the cause of the error.

In the example shown above, the value set in the reference variable proxy.client.ip (as seen in the screenshot of the trace above) matches the IP address defined in the <SourceAddress> element of the Access Control policy, thus triggering the error response:
```
"faultstring": "Access Denied for client ip : 104.132.196.83"
```

Resolution

If the Access Control policy is intended to deny access to API requests coming from the specific IP address(es) listed in the faultstring, then the error message is expected. In this case, there is no additional action is required.

However, if you determine that the specific IP address(es) can be given access to the API requests for the specific API Proxy, then modify the Access Control Policy to allow access to those IP address(es). Alternatively, you can remove the Access Control Policy from the API Proxy if you don't want to deny access to any IP address(es).

Here is an example that shows how to allow access to a specific IP Address 104.132.196.83 only and deny access for the rest:

<AccessControl name="ACL">
  <IPRules noRuleMatchAction = "DENY">
    <MatchRule action = "ALLOW">
      <SourceAddress mask="32">104.132.196.83</SourceAddress>
    </MatchRule>
  </IPRules>
</AccessControl>