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Date: Tue, 22 Jun 1999 08:19:48 -0700 (PDT)
From: grandi@noao.edu
To: freebsd-gnats-submit@freebsd.org
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Subject: conf/12342: /etc/hosts.allow must use numerical IP addresses when protecting portmap
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>Number:         12342
>Category:       conf
>Synopsis:       /etc/hosts.allow must use numerical IP addresses when protecting portmap
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Jun 22 08:20:00 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator:     Steve Grandi
>Release:        FreeBSD 3.2-STABLE
>Organization:
National Optical Astronomy Observatories
>Environment:
FreeBSD noao.edu 3.2-STABLE FreeBSD 3.2-STABLE #6: Thu Jun 10 12:22:41 MST 1999
     grandi@noao.edu:/usr/src/sys/compile/NOAO
>Description:
In /usr/src/usr.sbin/portmap/pmap_check.c, in a comment at the beginning
concerning  -DHOSTS_ACCESS, we find:

  * If compiled with -DHOSTS_ACCESS, reject requests from hosts that are not
  * authorized by the /etc/hosts.{allow,deny} files. The local system is
  * always treated as an authorized host. The access control tables are never
  * consulted for requests from the local system, and are always consulted
  * for requests from other hosts. Access control is based on IP addresses
  * only; attempts to map an address to a host name might cause the
  * portmapper to hang.

However, the examples in /etc/hosts.allow use host names when dealing
with the portmap.
>How-To-Repeat:
Try to use a hostname when protecting portmap in /etc/hosts.allow
>Fix:
--- hosts.allow Tue May 11 02:52:05 1999
+++ hosts.allow.NEW     Tue Jun 22 08:17:30 1999
@@ -33,9 +33,11 @@
 sendmail : ALL : allow
 
 # Portmapper is used for all RPC services; protect your NFS!
-portmap : localhost : allow
-portmap : .nice.guy.example.com : allow
-portmap : .evil.cracker.example.com : deny
+#   NOTE: numercial IP addresses must be used for portmap.
+#   furthermore, local machine acceses are not checked against hosts.allow
+#portmap : 123.231.132/255.255.255.0 : allow
+#portmap : 123.222. : allow
+#portmap : 111.222.111.222 : deny
 portmap : ALL : allow
 
 # Provide a small amount of protection for ftpd


>Release-Note:
>Audit-Trail:
>Unformatted:


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