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REST API Authentication

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Endi S. Dewata edited this page Jul 12, 2022 · 3 revisions

Overview

PKI uses on Tomcat and RESTEasy for REST API authentication.

Connector

The SSL Connector in Tomcat is configured to optionally request client certificate but it will not fail if the client doesn’t provide any certificate:

<Connector name="Secure" port="8443"
    ...
    clientAuth="want"
    ...
    />

There’s a bug in Tomcat JSS so this option doesn’t work now.

See also The HTTP Connector.

Security Constraint

In the web.xml most REST services are configured to require certain roles. This will trigger authentication and authorization process.

<security-constraint>

    <web-resource-collection>
        <web-resource-name>Agent Services</web-resource-name>
        <url-pattern>/rest/agent/*</url-pattern>
    </web-resource-collection>

    <auth-constraint>
        <role-name>*</role-name>
    </auth-constraint>

    ...

</security-constraint>

Authenticaticator and Realm

In the context.xml each PKI Web application is configured with an authenticator and a realm:

<Context crossContext="true" allowLinking="true">

    <Valve className="com.netscape.cms.tomcat.SSLAuthenticatorWithFallback" />

    <Realm className="com.netscape.cms.tomcat.ProxyRealm" />

</Context>

The fallback authenticator will authenticate the user certificate if it’s provided. Otherwise it will request username and password. The actual authentication will be performed by the realm.

Tomcat requires that the classes for the authenticator and the realm must be stored in common/lib. The problem is the PKI classes that do the authentication are stored in the WEB-INF/lib, which is not accessible directly by the realm. To address this problem, a ProxyRealm is created in common/lib to satisfy Tomcat’s requirement and a PKIRealm is created in WEB-INF/lib to execute the actual authentication. When the Web application is started, the ProxyRealm will be linked to the PKIRealm (see CMSStartServlet.java below). The ProxyRealm will then forward any incoming authentication request to the PKIRealm.

// Register realm for this subsystem
String context = getServletContext().getContextPath();
if (context.startsWith("/")) context = context.substring(1);
ProxyRealm.registerRealm(context, new PKIRealm());

See Also

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