[Tomcat Wiki] Update of "FAQ/Password" by KonstantinKolinko

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The "FAQ/Password" page has been changed by KonstantinKolinko.
The comment on this change is: Add two more options.
http://wiki.apache.org/tomcat/FAQ/Password?action=diff&rev1=3&rev2=4

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  Of course, auditors do not like this answer. So there are some ways to get around this ...
   * Use properties replacement so that in the xml config you have ${db.password} and in conf/catalina.properties you put the password there. You are not safer, but the auditors may be happy.
-  * Since server.xml is an XML file — you can use XML entities. For example: "woot" becomes "woot" which is a way to obscure the password
+  * Since server.xml is an XML file — you can use XML entities. For example: "woot" becomes "woot" which is a way to obscure the password.
+  * XML entities can be read from an external file. That is, add the following lines at the top of server.xml just above the {{{<Server>}}} element:
+ {{{
+ <!DOCTYPE server-xml [
+   <!ENTITY resources SYSTEM "resources.txt">
+ ]>
+ }}}
+  Now, whenever you write {{{&resources;}}} in the text below, it will be replaced by the content of the file "resources.txt". The file path is relative to the conf directory.
   * Write your own datasource implementation which wraps your datasource and obscure your brains out. See the docs on how to do this.
+  * Write your own {{{javax.naming.spi.ObjectFactory}}} implementation that creates and configures your datasource.
-  * (Tomcat 7) Write your own org.apache.tomcat.util.!IntrospectionUtils.!PropertySource implementation to 'decrypt' passwords that are 'encrypted' in catalina.properties and referenced via ${...} in server.xml. You'll need to set the system property org.apache.tomcat.util.digester.PROPERTY_SOURCE to point to your !PropertySource implmentation. This won't provide any real security, it just adds another level of indirection - i.e. 'security by obscurity'.
+  * (Tomcat 7) Write your own {{{org.apache.tomcat.util.IntrospectionUtils.PropertySource}}} implementation to 'decrypt' passwords that are 'encrypted' in catalina.properties and referenced via ${...} in server.xml. You'll need to set the system property {{{org.apache.tomcat.util.digester.PROPERTY_SOURCE}}} to point to your !PropertySource implementation. This won't provide any real security, it just adds another level of indirection - i.e. 'security by obscurity'.
   
  

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