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From Fred Stluka <f...@bristle.com>
Subject Re: Why does startup of Tomcat 5.0.28 server make tomcat-users.xml world-readable?...
Date Wed, 15 Sep 2004 19:50:36 GMT
OK.  Thanks!

--Fred
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 Fred Stluka -- mailto:fred@bristle.com -- http://bristle.com/~fred/
 Bristle Software, Inc -- http://bristle.com -- "Glad to be of service!"
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"Shapira, Yoav" wrote:

> Hi,
>
> >However, I still wonder:
> >1.  Why does Tomcat re-write the tomcat-users.xml file at
> >     startup?
>
> This I already answered: Tomcat rewrites the tomcat-users.xml at startup
> to ensure it has permissions on it, because the admin webapp must have
> these permissions to allow editing of user information.
>
> >2.  Why does it use the umask value instead of just leaving
> >     the protections as they were before it updated the file?
>
> This is the java.io.File default behavior: we don't modify anything and
> don't want to have platform-specific or native code in Tomcat.  If you
> look at the java.io.File JavaDoc, you'll see there's no portable way to
> control this.
>
> >3.  Isn't this a problem for most Tomcat installations, since
> >     without the umask I had applied to my tomcat user, the
> >     default umask is 002, not 022, so the tomcat-users.xml
> >     file would be changed to 664, not merely 644, at each
> >     startup?  Seems like the default Tomcat behavior
> >     introduces a security risk.
>
> Judging by the fact this is raised about once a year on the mailing
> list, I'd say the majority of people don't care.  Secure installations
> take care with their umasks from the beginning, so for them this is not
> an issue.
>
> Yoav
>
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