iptables-ftp Post: 302554717

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Top Forums UNIX for Dummies Questions & Answers iptables-ftp Post 302554717 by ktb231 on Monday 12th of September 2011 08:49:43 PM

09-12-2011

Registered User

Thanks DG.

The client is on the outside. Yes I did try passive. I redid my firewall a little. I need to do some reading on the higher port rule you mentioned. I keep considering port 22 ftp because I do web design for a living and my hosting company uses what they call sftp on port 22, it's not technically ftp. Question on the first part of my firewall which if understand right is deny all then open what I need. If I put DROP in the OUTPUT under the filter, I have the local ftp problem, with ACCEPT it works. Everything else works either way. I am assuming that's where I need some understanding on exactly where things are moving around and set up the higher port rule. How unsecure is it if I leave the ACCEPT there? I have a home network with a bunch of vm clients and servers set up for me to experiment with but like have the web server and ftp to the outside world so I can grab files when I need them and test things with out having to log into my hosing company's servers.

Code:

*filter
:INPUT DROP [1:242]
:FORWARD DROP [0:0]
:OUTPUT ACCEPT [0:0]
:LOG_DROP - [0:0]
#:LOG_ACCEPT - [0:0]
:icmp_packets - [0:0]

# Allow traffic already established to continue

-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

# Allow web services

-A INPUT -p tcp --dport ssh -j ACCEPT
-A INPUT -p tcp --dport domain -j ACCEPT
-A INPUT -p tcp --dport ftp -j ACCEPT
-A INPUT -p udp --dport ftp -j ACCEPT
-A INPUT -p tcp --dport ftp-data -j ACCEPT
-A INPUT -p udp --dport ftp-data -j ACCEPT
-A INPUT -p tcp --dport 80 -j ACCEPT
-A INPUT -p tcp --dport 443 -j ACCEPT
-A INPUT -p tcp --dport 25 -j ACCEPT
-A INPUT -p tcp --dport 465 -j ACCEPT
-A INPUT -p tcp --dport 110 -j ACCEPT
-A INPUT -p tcp --dport 137:139 -j ACCEPT
-A INPUT -p udp --dport 137:139 -j ACCEPT
-A INPUT -p tcp --dport 143 -j ACCEPT
-A INPUT -p tcp --dport 585 -j ACCEPT
-A INPUT -p tcp --dport 993 -j ACCEPT
-A INPUT -p tcp --dport 995 -j ACCEPT
-A INPUT -p tcp --dport 8080 -j ACCEPT
-A INPUT -p tcp --dport 8181 -j ACCEPT



# Allow local loopback services

-A INPUT -i lo -j ACCEPT

# Allow OUTPUT

-A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A OUTPUT -p tcp --dport ssh -j ACCEPT
-A OUTPUT -p tcp --dport domain -j ACCEPT
-A OUTPUT -p tcp --dport ftp -j ACCEPT
-A OUTPUT -p udp --dport ftp -j ACCEPT
-A OUTPUT -p tcp --dport ftp-data -j ACCEPT
-A OUTPUT -p udp --dport ftp-data -j ACCEPT
-A OUTPUT -p tcp --dport 80 -j ACCEPT
-A OUTPUT -p tcp --dport 443 -j ACCEPT
-A OUTPUT -p tcp --dport 25 -j ACCEPT
-A OUTPUT -p tcp --dport 465 -j ACCEPT
-A OUTPUT -p tcp --dport 110 -j ACCEPT
-A OUTPUT -p tcp --dport 137:139 -j ACCEPT
-A OUTPUT -p udp --dport 137:139 -j ACCEPT
-A OUTPUT -p tcp --dport 143 -j ACCEPT
-A OUTPUT -p tcp --dport 585 -j ACCEPT
-A OUTPUT -p tcp --dport 993 -j ACCEPT
-A OUTPUT -p tcp --dport 995 -j ACCEPT
-A OUTPUT -p tcp --dport 8080 -j ACCEPT
-A OUTPUT -p tcp --dport 8181 -j ACCEPT

# Allow everything from home
-A INPUT -p all -s 192.168.0.1/24 -j ACCEPT


# Allow pings

-I INPUT -p icmp --icmp-type destination-unreachable -j ACCEPT
-I INPUT -p icmp --icmp-type source-quench -j ACCEPT
-I INPUT -p icmp --icmp-type time-exceeded -j ACCEPT
-A icmp_packets -p icmp -m icmp --icmp-type 0 -j ACCEPT
-A icmp_packets -s 192.168.0.170 -p icmp -m icmp --icmp-type 8 -j ACCEPT
#-A icmp_packets -s 192.168.0.197 -p icmp -m icmp --icmp-type 8 -j ACCEPT
-A icmp_packets -p icmp -m icmp --icmp-type 8 -j ACCEPT
-A icmp_packets -p icmp -m icmp --icmp-type 3 -j ACCEPT
-A icmp_packets -p icmp -m icmp --icmp-type 11 -j ACCEPT
COMMIT

ktb231

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ftpd_selinux

ftpd_selinux(8) 					 ftpd SELinux policy documentation					   ftpd_selinux(8)

NAME

       ftpd_selinux - Security-Enhanced Linux policy for ftp daemons.

DESCRIPTION

       Security-Enhanced Linux provides security for ftp daemons via flexible mandatory access control.

FILE_CONTEXTS
       SELinux requires files to have a file type. File types may be specified with semanage and are restored with restorecon.	Policy governs the
       access that daemons have to files.

       Allow ftp servers to read the /var/ftp directory by adding the public_content_t file type to the directory and by restoring the file type.

       semanage fcontext -a -t public_content_t "/var/ftp(/.*)?"

       restorecon -F -R -v /var/ftp

       Allow ftp servers to read and write /var/tmp/incoming by adding the public_content_rw_t type to the directory and  by  restoring  the  file
       type.  This also requires the allow_ftpd_anon_write boolean to be set.

       semanage fcontext -a -t public_content_rw_t "/var/ftp/incoming(/.*)?"

       restorecon -F -R -v /var/ftp/incoming

BOOLEANS

       SELinux policy is based on least privilege required and may also be customizable by setting a boolean with setsebool.

       Allow ftp servers to read and write files with the public_content_rw_t file type.

       setsebool -P allow_ftpd_anon_write on

       Allow ftp servers to read or write files in the user home directories.

       setsebool -P ftp_home_dir on

       Allow ftp servers to read or write all files on the system.

       setsebool -P allow_ftpd_full_access on

       Allow ftp servers to use cifs for public file transfer services.

       setsebool -P allow_ftpd_use_cifs on

       Allow ftp servers to use nfs for public file transfer services.

       setsebool -P allow_ftpd_use_nfs on

       system-config-selinux is a GUI tool available to customize SELinux policy settings.

AUTHOR

       This manual page was written by Dan Walsh <dwalsh@redhat.com>.

SEE ALSO

       selinux(8), ftpd(8), setsebool(8), semanage(8), restorecon(8)

dwalsh@redhat.com						    17 Jan 2005 						   ftpd_selinux(8)