RealmBase and DIGEST authentication

[klosnor]

Hello,

in Tomcat 4.0 it is possible to use BASIC authentication together with encrypted 
passwords (e.g. adding attribute digest="MD5") to a <Realm/> element, or DIGEST with 
passwords only stored in clear-text. It's not possible to use DIGEST authentication 
together with encrypted passwords. The reason is getDigest(username, realmName) in the 
RealmBase class, which
calculates the digest from username + ":" + realmName + ":" + getPassword(username):

    protected String getDigest(String username, String realmName) {
        if (md5Helper == null) {
            try {
                md5Helper = MessageDigest.getInstance("MD5");
            } catch (NoSuchAlgorithmException e) {
                e.printStackTrace();
                throw new IllegalStateException();
            }
        }
        String digestValue = username + ":" + realmName + ":"
            + getPassword(username);
        byte[] digest =
            md5Helper.digest(digestValue.getBytes());
        return md5Encoder.encode(digest);
    }

What about storing those digest values directly inside the password attributes of 
tomcat-user.xml, e.g. using:

    java org.apache.catalina.realm.RealmBase \
        -a {algorithm} "{username}:{realm}:{cleartext-password}"

and first checking if a MessageDigest is available in RealmBase?

    protected String getDigest(String username, String realmName) {
        if (md5Helper == null) {
            try {
                md5Helper = MessageDigest.getInstance("MD5");
            } catch (NoSuchAlgorithmException e) {
                e.printStackTrace();
                throw new IllegalStateException();
            }
        }
        if (hasMessageDigest()) {
            return getPassword(username);
        } else {
            String digestValue = username + ":" + realmName + ":"
                + getPassword(username);
            byte[] digest =
                md5Helper.digest(digestValue.getBytes());
            return md5Encoder.encode(digest);
        }
    }

Best regards,
Norbert Klose.
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RealmBase.java
Description: JavaScript source

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