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start:linux:ubuntu:ufw [2020/06/29 14:26]
wikiadmin angelegt 		start:linux:ubuntu:ufw [2020/06/29 15:19] (aktuell)
wikiadmin [Einige Beispielanwendungen]
Zeile 1: Zeile 1:
-====== ufw Installation ======+====== UFW Firewall ====== 
 +===== Installation und Status =====
 [[https://wiki.ubuntuusers.de/iptables2/|iptables2]] ist eine Firewall Einrichtungen bei Ubuntu oder Debian. Eine vereinfachte Version ist [[https://wiki.ubuntuusers.de/ufw/|ufw ]]. [[https://wiki.ubuntuusers.de/iptables2/|iptables2]] ist eine Firewall Einrichtungen bei Ubuntu oder Debian. Eine vereinfachte Version ist [[https://wiki.ubuntuusers.de/ufw/|ufw ]].
  
-<code c#>+<code CPP [enable_line_numbers="false",highlight_lines_extra="0,"]>
 sudo apt-get update // Software update starten. sudo apt-get update // Software update starten.
 sudo -s // root Rechte erlangen, Sie müssendas root Passort eingeben. sudo -s // root Rechte erlangen, Sie müssendas root Passort eingeben.
 apt-get install ufw // Startet die Installation von ufw apt-get install ufw // Startet die Installation von ufw
 +</code>
 +
 +Mit folgendem Befehlt lässt sich die Einstellungen der Firewall anzeigen lassen.
 +<code CPP [enable_line_numbers="false",highlight_lines_extra="0,"]>
 +ufw status // Beispielausgabe:
 +
 +root@HPGen10-1:~# ufw status
 +Status: active
 +
 +To                         Action      From
 +--                         ------      ----
 +OpenSSH                    ALLOW       Anywhere
 +22/tcp                     ALLOW       Anywhere
 +OpenSSH (v6)               ALLOW       Anywhere (v6)
 +22/tcp (v6)                ALLOW       Anywhere (v6)
 +
 +root@HPGen10-1:~#
 +
 +</code>
 +
 +===== Wo wird was gespeichert ? =====
 +
 +Die Einstellungen werden in folgenden drei Dateien gespeichern:
 +
 +  -     /etc/ufw/**before.rules**
 +  -     /var/lib/ufw/**user.rules** (oder /lib/ufw/user.rules - in welche auch die in der Kommandozeile definierten Regeln persistiert werden)
 +  -     /etc/ufw/**after.rules**
 +
 +Diese Dateien lassen sich mit jedem Texteditor wie zum Beispiel [[https://www.nano-editor.org/|nano]] verwalten.
 +Hier eine Beispielausgabe der Datei: **/etc/ufw/before.rules**
 +
 +<code CPP [enable_line_numbers="false",highlight_lines_extra="0,"]>
 +root@HPGen10-1:~# root@HPGen10-1:~# cat /etc/ufw/before.rules
 +#
 +# rules.before
 +#
 +# Rules that should be run before the ufw command line added rules. Custom
 +# rules should be added to one of these chains:
 +#   ufw-before-input
 +#   ufw-before-output
 +#   ufw-before-forward
 +#
 +
 +# Don't delete these required lines, otherwise there will be errors
 +*filter
 +:ufw-before-input - [0:0]
 +:ufw-before-output - [0:0]
 +:ufw-before-forward - [0:0]
 +:ufw-not-local - [0:0]
 +# End required lines
 +
 +
 +# allow all on loopback
 +-A ufw-before-input -i lo -j ACCEPT
 +-A ufw-before-output -o lo -j ACCEPT
 +
 +# quickly process packets for which we already have a connection
 +-A ufw-before-input -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
 +-A ufw-before-output -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
 +-A ufw-before-forward -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
 +
 +# drop INVALID packets (logs these in loglevel medium and higher)
 +-A ufw-before-input -m conntrack --ctstate INVALID -j ufw-logging-deny
 +-A ufw-before-input -m conntrack --ctstate INVALID -j DROP
 +
 +# ok icmp codes for INPUT
 +-A ufw-before-input -p icmp --icmp-type destination-unreachable -j ACCEPT
 +-A ufw-before-input -p icmp --icmp-type time-exceeded -j ACCEPT
 +-A ufw-before-input -p icmp --icmp-type parameter-problem -j ACCEPT
 +-A ufw-before-input -p icmp --icmp-type echo-request -j ACCEPT
 +
 +# ok icmp code for FORWARD
 +-A ufw-before-forward -p icmp --icmp-type destination-unreachable -j ACCEPT
 +-A ufw-before-forward -p icmp --icmp-type time-exceeded -j ACCEPT
 +-A ufw-before-forward -p icmp --icmp-type parameter-problem -j ACCEPT
 +-A ufw-before-forward -p icmp --icmp-type echo-request -j ACCEPT
 +
 +# allow dhcp client to work
 +-A ufw-before-input -p udp --sport 67 --dport 68 -j ACCEPT
 +
 +#
 +# ufw-not-local
 +#
 +-A ufw-before-input -j ufw-not-local
 +
 +# if LOCAL, RETURN
 +-A ufw-not-local -m addrtype --dst-type LOCAL -j RETURN
 +
 +# if MULTICAST, RETURN
 +-A ufw-not-local -m addrtype --dst-type MULTICAST -j RETURN
 +
 +# if BROADCAST, RETURN
 +-A ufw-not-local -m addrtype --dst-type BROADCAST -j RETURN
 +
 +# all other non-local packets are dropped
 +-A ufw-not-local -m limit --limit 3/min --limit-burst 10 -j ufw-logging-deny
 +-A ufw-not-local -j DROP
 +
 +# allow MULTICAST mDNS for service discovery (be sure the MULTICAST line above
 +# is uncommented)
 +-A ufw-before-input -p udp -d 224.0.0.251 --dport 5353 -j ACCEPT
 +
 +# allow MULTICAST UPnP for service discovery (be sure the MULTICAST line above
 +# is uncommented)
 +-A ufw-before-input -p udp -d 239.255.255.250 --dport 1900 -j ACCEPT
 +
 +# don't delete the 'COMMIT' line or these rules won't be processed
 +COMMIT
 +root@HPGen10-1:~#       
 +
 +</code>
 +
 +Hier eine Beispielausgabe der Datei: **/etc/ufw/user.rules**
 +<code CPP [enable_line_numbers="false",highlight_lines_extra="0,"]>
 +root@HPGen10-1:~# root@HPGen10-1:~# cat /etc/ufw/user.rules
 +*filter
 +:ufw-user-input - [0:0]
 +:ufw-user-output - [0:0]
 +:ufw-user-forward - [0:0]
 +:ufw-before-logging-input - [0:0]
 +:ufw-before-logging-output - [0:0]
 +:ufw-before-logging-forward - [0:0]
 +:ufw-user-logging-input - [0:0]
 +:ufw-user-logging-output - [0:0]
 +:ufw-user-logging-forward - [0:0]
 +:ufw-after-logging-input - [0:0]
 +:ufw-after-logging-output - [0:0]
 +:ufw-after-logging-forward - [0:0]
 +:ufw-logging-deny - [0:0]
 +:ufw-logging-allow - [0:0]
 +:ufw-user-limit - [0:0]
 +:ufw-user-limit-accept - [0:0]
 +### RULES ###
 +
 +### tuple ### allow tcp 22 0.0.0.0/0 any 0.0.0.0/0 OpenSSH - in
 +-A ufw-user-input -p tcp --dport 22 -j ACCEPT -m comment --comment 'dapp_OpenSSH'
 +
 +### tuple ### allow tcp 22 0.0.0.0/0 any 0.0.0.0/0 in
 +-A ufw-user-input -p tcp --dport 22 -j ACCEPT
 +
 +### END RULES ###
 +
 +### LOGGING ###
 +-A ufw-after-logging-input -j LOG --log-prefix "[UFW BLOCK] " -m limit --limit 3/min --limit-burst 10
 +-A ufw-after-logging-forward -j LOG --log-prefix "[UFW BLOCK] " -m limit --limit 3/min --limit-burst 10
 +-I ufw-logging-deny -m conntrack --ctstate INVALID -j RETURN -m limit --limit 3/min --limit-burst 10
 +-A ufw-logging-deny -j LOG --log-prefix "[UFW BLOCK] " -m limit --limit 3/min --limit-burst 10
 +-A ufw-logging-allow -j LOG --log-prefix "[UFW ALLOW] " -m limit --limit 3/min --limit-burst 10
 +### END LOGGING ###
 +
 +### RATE LIMITING ###
 +-A ufw-user-limit -m limit --limit 3/minute -j LOG --log-prefix "[UFW LIMIT BLOCK] "
 +-A ufw-user-limit -j REJECT
 +-A ufw-user-limit-accept -j ACCEPT
 +### END RATE LIMITING ###
 +COMMIT
 +root@HPGen10-1:~# 
 +                                                                                                                                                                                                                  
 +</code>
 +
 +Hier eine Beispielausgabe der Datei: **/etc/ufw/after.rules**
 +<code CPP [enable_line_numbers="false",highlight_lines_extra="0,"]>
 +root@HPGen10-1:~# root@HPGen10-1:~# cat /etc/ufw/after.rules
 +#
 +# rules.input-after
 +#
 +# Rules that should be run after the ufw command line added rules. Custom
 +# rules should be added to one of these chains:
 +#   ufw-after-input
 +#   ufw-after-output
 +#   ufw-after-forward
 +#
 +
 +# Don't delete these required lines, otherwise there will be errors
 +*filter
 +:ufw-after-input - [0:0]
 +:ufw-after-output - [0:0]
 +:ufw-after-forward - [0:0]
 +# End required lines
 +
 +# don't log noisy services by default
 +-A ufw-after-input -p udp --dport 137 -j ufw-skip-to-policy-input
 +-A ufw-after-input -p udp --dport 138 -j ufw-skip-to-policy-input
 +-A ufw-after-input -p tcp --dport 139 -j ufw-skip-to-policy-input
 +-A ufw-after-input -p tcp --dport 445 -j ufw-skip-to-policy-input
 +-A ufw-after-input -p udp --dport 67 -j ufw-skip-to-policy-input
 +-A ufw-after-input -p udp --dport 68 -j ufw-skip-to-policy-input
 +
 +# don't log noisy broadcast
 +-A ufw-after-input -m addrtype --dst-type BROADCAST -j ufw-skip-to-policy-input
 +
 +# don't delete the 'COMMIT' line or these rules won't be processed
 +COMMIT
 +root@HPGen10-1:~#   
 +
 +</code>
 +
 +===== Einige Beispielanwendungen =====
 +
 +<code CPP [enable_line_numbers="false",highlight_lines_extra="0,"]>
 +# Listet alle Anwendungen auf die durch die Firewall gelangen soll.
 +ufw app list 
 +
 +# Zeigt die Details zu OpenSSH an.
 +ufw app info OpenSSH
 +
 +# Lässt OpenSSH durch die Firewall.
 +ufw allow OpenSSH
 +
 +# Zeigt die Einstellungen an.
 +ufw status
 +
 +# Den Port 32456 über TCP freizugeben
 +ufw 32456/tcp
 +
 +</code>
 +
 +===== Dokumentation =====
 +Mit folgendem Behfehl lässt sich die Dokumentation von **ufw** ausgeben
 +
 +<code C#>
 +sudo man ufw
 +</code>
 +
 +<code C#>
 +root@HPGen10-1:~# ufw --help
 +
 +Usage: ufw COMMAND
 +
 +Commands:
 + enable                          enables the firewall
 + disable                         disables the firewall
 + default ARG                     set default policy
 + logging LEVEL                   set logging to LEVEL
 + allow ARGS                      add allow rule
 + deny ARGS                       add deny rule
 + reject ARGS                     add reject rule
 + limit ARGS                      add limit rule
 + delete RULE|NUM                 delete RULE
 + insert NUM RULE                 insert RULE at NUM
 + route RULE                      add route RULE
 + route delete RULE|NUM           delete route RULE
 + route insert NUM RULE           insert route RULE at NUM
 + reload                          reload firewall
 + reset                           reset firewall
 + status                          show firewall status
 + status numbered                 show firewall status as numbered list of RULES
 + status verbose                  show verbose firewall status
 + show ARG                        show firewall report
 + version                         display version information
 +
 +Application profile commands:
 + app list                        list application profiles
 + app info PROFILE                show information on PROFILE
 + app update PROFILE              update PROFILE
 + app default ARG                 set default application policy
 +
 +root@HPGen10-1:~#                                                         
 +</code>
  
-</code