bin/99662: quota information leak while rpc.rquotad is used

[Jui-Nan Lin]

>Number:         99662
>Category:       bin
>Synopsis:       quota information leak while rpc.rquotad is used
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Jun 30 19:20:14 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Jui-Nan Lin
>Release:        6.0-RELEASE
>Organization:
Department of Computer Science, NCTU
>Environment:
FreeBSD cchome 6.0-RELEASE-p7 FreeBSD 6.0-RELEASE-p7 #3: Sun Apr 30 05:53:52 CST 2006     root at cchome.csie.nctu.edu.tw:/usr/obj/usr/src/sys/CCHOME  i386

>Description:
When I try to query other user's quota in the NFS server, it told me "quota: /raid/quota.user: Permission denied". But when I try to query other user's quota in the NFS client, it will return his/her quota.
>How-To-Repeat:
nfsserver% quota -v someuser
quota: /raid/quota.user: Permission denied
nfsclient% quota -v someuser
Disk quotas for user someuser (uid xxxxx):
     Filesystem   usage   quota   limit   grace   files   quota   limit   grace
      /amd/raid   17178  120000  150000            1406   12000   15000

>Fix:
In FreeBSD 4.x, the problem is solved by checking uid in src/usr.bin/quota/quota.c. But I think it would be better if we check the uid in the rpc.rquotad. But I am not familiar with SUNRPC, and I don't know if there will be the uid information transmitted in the RPC request/reponse.
>Release-Note:
>Audit-Trail:
>Unformatted: