How do I secure my custom Magento2 REST api

Question

I created a custom REST api in Magento2. But, how do I secure it with the built-in Magento2 REST api security?

just like /index.php/rest/V1/customers/me is secured with the Authorization header

Answer 1

while creating custom api configuration in webapi.xml put ref="self"

if you configured like this you can access API with authentication only provided by magento 2 like oauth,token,oauth2

Disable access for api to anonymous in admin panel of magento

Answer 2

Access Security on Custom api applied through

Magento 2 allows some web APIs to be accessed by unauthenticated (anonymous) users.To prevent access to anonymous user , define a resource to which the caller must have access. Like ,

<route url="/V1/techyrules/webservice/deleteAddressMine" method="PUT">
    <service class="techyrules\WebService\Api\AddressManagementInterface" method="deleteAddressMine"/>
        <resources>
            <resource ref="self"/>
        </resources>
</route> 

ref, Valid values are self, anonymous, or a Magento resource, such as Magento_Customer::group.

Self example, user authenticate him/herself by username & password then token will be generated in response that token act as self permission for further processes.

Answer 3

Replace <resource ref="anonymous"/> by <resource ref="Venodr_Module::name_of_the_acl_entry"/> in the etc/webapi.xml of your module:

<route url="/V1/customers/me" method="...">
    <service class="..." method="..."/>
    <resources>
        <resource ref="Vendor_Module::name_of_the_acl_entry"/>
        <!--<resource ref="anonymous"/>-->
    </resources>
</route>

and setup ACL in the etc/acl.xml:

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:framework:Acl/etc/acl.xsd">
    <acl>
        <resources>
            <resource id="Magento_Backend::admin">
                <resource id="Vendor_Module::name_of_the_acl_entry" title="Human readable title"/>
            </resource>
        </resources>
    </acl>
</config>

Then grant access for concrete backend user in "System / Permissions / User Roles", select Role, tab "Role Resources" and "Resource Access". Select "All" or select "Custom" and check resource named "Human readable title".