# /etc/hosts.allow # See 'man tcpd' and 'man 5 hosts_access' for a detailed description # of /etc/hosts.allow and /etc/hosts.deny. # # short overview about daemons and servers that are built with # tcp_wrappers support: # # package name | daemon path | token # ---------------------------------------------------------------------------- # ssh, openssh | /usr/sbin/sshd | sshd, sshd-fwd-x11, sshd-fwd- # quota | /usr/sbin/rpc.rquotad | rquotad # tftpd | /usr/sbin/in.tftpd | in.tftpd # portmap | /sbin/portmap | portmap # The portmapper does not verify against hostnames # to prevent hangs. It only checks non-local addresses. # # (kernel nfs server) # nfs-utils | /usr/sbin/rpc.mountd | mountd # nfs-utils | /sbin/rpc.statd | statd # # (unfsd, userspace nfs server) # nfs-server | /usr/sbin/rpc.mountd | rpc.mountd # nfs-server | /usr/sbin/rpc.ugidd | rpc.ugidd # # (printing services) # lprng | /usr/sbin/lpd | lpd # cups | /usr/sbin/cupsd | cupsd # The cupsd server daemon reports to the cups # error logs, not to the syslog(3) facility. # # (Uniterrupted Power Supply Software) # apcupsd | /sbin/apcupsd | apcupsd # apcupsd | /sbin/apcnisd | apcnisd # # All of the other network servers such as samba, apache or X, have their own # access control scheme that should be used instead. # # In addition to the services above, the services that are started on request # by inetd or xinetd use tcpd to "wrap" the network connection. tcpd uses # the last component of the server pathname as a token to match a service in # /etc/hosts.{allow,deny}. See the file /etc/inetd.conf for the token names. # The following examples work when uncommented: # # # Example 1: Fire up a mail to the admin if a connection to the printer daemon # has been made from host foo.bar.com, but simply deny all others: # lpd : foo.bar.com : spawn /bin/echo "%h printer access" | \ # mail -s "tcp_wrappers on %H" root # # # Example 2: grant access from local net, reject with message from elsewhere. # in.telnetd : ALL EXCEPT LOCAL : ALLOW # in.telnetd : ALL : \ # twist /bin/echo -e "\n\raccess from %h declined.\n\rGo away.";sleep 2 # # # Example 3: run a different instance of rsyncd if the connection comes # from network 172.20.0.0/24, but regular for others: # rsyncd : 172.20.0.0/255.255.255.0 : twist /usr/local/sbin/my_rsyncd-script # rsyncd : ALL : ALLOW #