server/src/main/java/com/orientechnologies/orient/server/security/authenticator/ODefaultPasswordAuthenticator.java
public OServerUserConfiguration getUser(final String username) {
    OServerUserConfiguration userCfg = null;

    synchronized (usersMap) {
      if (username != null) {
        String checkName = username;

        if (!isCaseSensitive())
          checkName = username.toLowerCase(Locale.ENGLISH);

        if (usersMap.containsKey(checkName)) {
          userCfg = usersMap.get(checkName);
        }
      }
    }

    return userCfg;
  }
public OServerUserConfiguration getUser(final String username) {
    OServerUserConfiguration userCfg = null;

    synchronized (usersMap) {
      if (username != null) {
        String checkName = username;

        if (!isCaseSensitive())
          checkName = username.toLowerCase(Locale.ENGLISH);

        if (usersMap.containsKey(checkName)) {
          userCfg = usersMap.get(checkName);
        }
      }
    }

    return userCfg;
  }
OSecurityAuthenticator