in questo momento sono in grado di ssh
ospitare su internet e ssh
dall'host alla macchina virtuale. Quello che voglio fare è ssh
direttamente sulla macchina Ospite dall'esterno.
Ho provato a farlo usando iptables
:
iptables -t nat -A PREROUTING -m tcp -p tcp --dport 2222 -j DNAT --to-destination 192.168.130.128:22
E ha anche aperto queste porte correlate su UFW
:
ufw allow routed
ufw allow outgoing
ufw deny incoming
ufw allow 2222/tcp
Dopo aver ricaricato i firewall, il telecomando ssh
si blocca debug1: Connecting to x.x.x.x [x.x.x.x] port 2222
e usando tcpdump -i vmnet8 'port 22'
posso vedere questo:
listening on vmnet8, link-type EN10MB (Ethernet), capture size 65535 bytes
18:56:03.002790 IP x.x.x.x.13203 > y.y.y.y.ssh: Flags [S], seq 1077492285, win 29200, options [mss 1260,sackOK,TS val 1388564 ecr 0,nop,wscale 7], length 0
18:56:03.003235 IP y.y.y.y.ssh > x.x.x.x.13203: Flags [S.], seq 3535035554, ack 1077492286, win 65535, options [mss 1460,nop,wscale 4,nop,nop,TS val 307333897 ecr 1388564,sackOK,eol], length 0
18:56:03.003290 IP x.x.x.x.13203 > y.y.y.y.ssh: Flags [R], seq 1077492286, win 32767, length 0
18:56:03.996287 IP x.x.x.x.13203 > y.y.y.y.ssh: Flags [S], seq 1077492285, win 29200, options [mss 1260,sackOK,TS val 1388664 ecr 0,nop,wscale 7], length 0
18:56:03.996770 IP y.y.y.y.ssh > x.x.x.x.13203: Flags [S.], seq 1749343118, ack 1077492286, win 65535, options [mss 1460,nop,wscale 4,nop,nop,TS val 307334888 ecr 1388664,sackOK,eol], length 0
18:56:03.996841 IP x.x.x.x.13203 > y.y.y.y.ssh: Flags [R], seq 1077492286, win 32767, length 0
18:56:05.997104 IP x.x.x.x.13203 > y.y.y.y.ssh: Flags [S], seq 1077492285, win 29200, options [mss 1260,sackOK,TS val 1388864 ecr 0,nop,wscale 7], length 0
18:56:06.001310 IP y.y.y.y.ssh > x.x.x.x.13203: Flags [S.], seq 3571006762, ack 1077492286, win 65535, options [mss 1460,nop,wscale 4,nop,nop,TS val 307336889 ecr 1388864,sackOK,eol], length 0
18:56:06.001344 IP x.x.x.x.13203 > y.y.y.y.ssh: Flags [R], seq 1077492286, win 32767, length 0
18:56:10.006741 IP x.x.x.x.13203 > y.y.y.y.ssh: Flags [S], seq 1077492285, win 29200, options [mss 1260,sackOK,TS val 1389265 ecr 0,nop,wscale 7], length 0
18:56:10.007142 IP y.y.y.y.ssh > x.x.x.x.13203: Flags [S.], seq 1524745855, ack 1077492286, win 65535, options [mss 1460,nop,wscale 4,nop,nop,TS val 307340890 ecr 1389265,sackOK,eol], length 0
18:56:10.007217 IP x.x.x.x.13203 > y.y.y.y.ssh: Flags [R], seq 1077492286, win 32767, length 0
tcpdump
sul mio MacOS
ospite risulterà lo stesso.
- HOST: Ubuntu 14.04
- OSPITE: mac os mavericks
- piattaforma di virtualizzazione: workstation Vmware 11
Aggiornare:
Questo è il ufw
messaggio di registro (registro alto):
Jun 21 09:47:44 srv05-crawler kernel: [518567.737815] [UFW AUDIT] IN=eth0 OUT=vmnet8 MAC=00:25:90:ef:aa:a0:00:24:c4:c0:d3:40:08:00 SRC=x.x.x.x DST=192.168.130.128 LEN=60 TOS=0x00 PREC=0x00 TTL=51 ID=15454 DF PROTO=TCP SPT=20039 DPT=22 WINDOW=29200 RES=0x00 SYN URGP=0
Jun 21 09:47:44 srv05-crawler kernel: [518567.737828] [UFW ALLOW] IN=eth0 OUT=vmnet8 MAC=00:25:90:ef:aa:a0:00:24:c4:c0:d3:40:08:00 SRC=x.x.x.x DST=192.168.130.128 LEN=60 TOS=0x00 PREC=0x00 TTL=51 ID=15454 DF PROTO=TCP SPT=20039 DPT=22 WINDOW=29200 RES=0x00 SYN URGP=0
Jun 21 09:47:45 srv05-crawler kernel: [518568.733572] [UFW AUDIT] IN=eth0 OUT=vmnet8 MAC=00:25:90:ef:aa:a0:00:24:c4:c0:d3:40:08:00 SRC=x.x.x.x DST=192.168.130.128 LEN=60 TOS=0x00 PREC=0x00 TTL=51 ID=15455 DF PROTO=TCP SPT=20039 DPT=22 WINDOW=29200 RES=0x00 SYN URGP=0
Jun 21 09:47:45 srv05-crawler kernel: [518568.733592] [UFW ALLOW] IN=eth0 OUT=vmnet8 MAC=00:25:90:ef:aa:a0:00:24:c4:c0:d3:40:08:00 SRC=x.x.x.x DST=192.168.130.128 LEN=60 TOS=0x00 PREC=0x00 TTL=51 ID=15455 DF PROTO=TCP SPT=20039 DPT=22 WINDOW=29200 RES=0x00 SYN URGP=0a
E ho usato questi comandi per ottenere i log dei pacchetti rilasciati:
iptables -N LOGGING
iptables -A INPUT -j LOGGING
iptables -A OUTPUT -j LOGGING
iptables -A LOGGING -m limit --limit 2/min -j LOG --log-prefix "IPT Drops: " --log-level 4
iptables -A LOGGING -j DROP
Ma non sono riuscito a rintracciare alcun dropped
pacchetto.
Aggiornamento 2:
iptables config come alcuni amici hanno chiesto:
# Generated by iptables-save v1.4.21 on Sun Jun 21 16:46:49 2015
*nat
:PREROUTING ACCEPT [1363:113716]
:INPUT ACCEPT [39:2210]
:OUTPUT ACCEPT [3135:202553]
:POSTROUTING ACCEPT [3146:203213]
-A PREROUTING -p tcp -m tcp --dport 2222 -j DNAT --to-destination 192.168.130.128:22
COMMIT
# Completed on Sun Jun 21 16:46:49 2015
# Generated by iptables-save v1.4.21 on Sun Jun 21 16:46:49 2015
*filter
:INPUT DROP [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:LOGGING - [0:0]
:fail2ban-ssh - [0:0]
:ufw-after-forward - [0:0]
:ufw-after-input - [0:0]
:ufw-after-logging-forward - [0:0]
:ufw-after-logging-input - [0:0]
:ufw-after-logging-output - [0:0]
:ufw-after-output - [0:0]
:ufw-before-forward - [0:0]
:ufw-before-input - [0:0]
:ufw-before-logging-forward - [0:0]
:ufw-before-logging-input - [0:0]
:ufw-before-logging-output - [0:0]
:ufw-before-output - [0:0]
:ufw-logging-allow - [0:0]
:ufw-logging-deny - [0:0]
:ufw-not-local - [0:0]
:ufw-reject-forward - [0:0]
:ufw-reject-input - [0:0]
:ufw-reject-output - [0:0]
:ufw-skip-to-policy-forward - [0:0]
:ufw-skip-to-policy-input - [0:0]
:ufw-skip-to-policy-output - [0:0]
:ufw-track-forward - [0:0]
:ufw-track-input - [0:0]
:ufw-track-output - [0:0]
:ufw-user-forward - [0:0]
:ufw-user-input - [0:0]
:ufw-user-limit - [0:0]
:ufw-user-limit-accept - [0:0]
:ufw-user-logging-forward - [0:0]
:ufw-user-logging-input - [0:0]
:ufw-user-logging-output - [0:0]
:ufw-user-output - [0:0]
-A INPUT -p tcp -m multiport --dports 22 -j fail2ban-ssh
-A INPUT -p tcp -m tcp --dport 22022 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 22 -j ACCEPT
-A INPUT -j ufw-before-logging-input
-A INPUT -j ufw-before-input
-A INPUT -j ufw-after-input
-A INPUT -j ufw-after-logging-input
-A INPUT -j ufw-reject-input
-A INPUT -j ufw-track-input
-A INPUT -j LOGGING
-A FORWARD -j ufw-before-logging-forward
-A FORWARD -j ufw-before-forward
-A FORWARD -j ufw-after-forward
-A FORWARD -j ufw-after-logging-forward
-A FORWARD -j ufw-reject-forward
-A FORWARD -j ufw-track-forward
-A OUTPUT -j ufw-before-logging-output
-A OUTPUT -j ufw-before-output
-A OUTPUT -j ufw-after-output
-A OUTPUT -j ufw-after-logging-output
-A OUTPUT -j ufw-reject-output
-A OUTPUT -j ufw-track-output
-A OUTPUT -j LOGGING
-A LOGGING -m limit --limit 2/min -j LOG --log-prefix "IPtables dropped: "
-A LOGGING -j DROP
-A fail2ban-ssh -j RETURN
-A ufw-after-input -p udp -m udp --dport 137 -j ufw-skip-to-policy-input
-A ufw-after-input -p udp -m udp --dport 138 -j ufw-skip-to-policy-input
-A ufw-after-input -p tcp -m tcp --dport 139 -j ufw-skip-to-policy-input
-A ufw-after-input -p tcp -m tcp --dport 445 -j ufw-skip-to-policy-input
-A ufw-after-input -p udp -m udp --dport 67 -j ufw-skip-to-policy-input
-A ufw-after-input -p udp -m udp --dport 68 -j ufw-skip-to-policy-input
-A ufw-after-input -m addrtype --dst-type BROADCAST -j ufw-skip-to-policy-input
-A ufw-after-logging-input -m limit --limit 3/min --limit-burst 10 -j LOG --log-prefix "[UFW BLOCK] "
-A ufw-before-forward -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A ufw-before-forward -p icmp -m icmp --icmp-type 3 -j ACCEPT
-A ufw-before-forward -p icmp -m icmp --icmp-type 4 -j ACCEPT
-A ufw-before-forward -p icmp -m icmp --icmp-type 11 -j ACCEPT
-A ufw-before-forward -p icmp -m icmp --icmp-type 12 -j ACCEPT
-A ufw-before-forward -p icmp -m icmp --icmp-type 8 -j ACCEPT
-A ufw-before-forward -j ufw-user-forward
-A ufw-before-input -i lo -j ACCEPT
-A ufw-before-input -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A ufw-before-input -m conntrack --ctstate INVALID -j ufw-logging-deny
-A ufw-before-input -m conntrack --ctstate INVALID -j DROP
-A ufw-before-input -p icmp -m icmp --icmp-type 3 -j ACCEPT
-A ufw-before-input -p icmp -m icmp --icmp-type 4 -j ACCEPT
-A ufw-before-input -p icmp -m icmp --icmp-type 11 -j ACCEPT
-A ufw-before-input -p icmp -m icmp --icmp-type 12 -j ACCEPT
-A ufw-before-input -p icmp -m icmp --icmp-type 8 -j ACCEPT
-A ufw-before-input -p udp -m udp --sport 67 --dport 68 -j ACCEPT
-A ufw-before-input -j ufw-not-local
-A ufw-before-input -d 224.0.0.251/32 -p udp -m udp --dport 5353 -j ACCEPT
-A ufw-before-input -d 239.255.255.250/32 -p udp -m udp --dport 1900 -j ACCEPT
-A ufw-before-input -j ufw-user-input
-A ufw-before-output -o lo -j ACCEPT
-A ufw-before-output -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A ufw-before-output -j ufw-user-output
-A ufw-logging-allow -m limit --limit 3/min --limit-burst 10 -j LOG --log-prefix "[UFW ALLOW] "
-A ufw-logging-deny -m conntrack --ctstate INVALID -m limit --limit 3/min --limit-burst 10 -j RETURN
-A ufw-logging-deny -m limit --limit 3/min --limit-burst 10 -j LOG --log-prefix "[UFW BLOCK] "
-A ufw-not-local -m addrtype --dst-type LOCAL -j RETURN
-A ufw-not-local -m addrtype --dst-type MULTICAST -j RETURN
-A ufw-not-local -m addrtype --dst-type BROADCAST -j RETURN
-A ufw-not-local -m limit --limit 3/min --limit-burst 10 -j ufw-logging-deny
-A ufw-not-local -j DROP
-A ufw-skip-to-policy-forward -j ACCEPT
-A ufw-skip-to-policy-input -j DROP
-A ufw-skip-to-policy-output -j ACCEPT
-A ufw-track-forward -p tcp -m conntrack --ctstate NEW -j ACCEPT
-A ufw-track-forward -p udp -m conntrack --ctstate NEW -j ACCEPT
-A ufw-track-output -p tcp -m conntrack --ctstate NEW -j ACCEPT
-A ufw-track-output -p udp -m conntrack --ctstate NEW -j ACCEPT
-A ufw-user-input -p tcp -m tcp --dport 22022 -j ACCEPT
-A ufw-user-input -p tcp -m tcp --dport 2222 -j ACCEPT
-A ufw-user-limit -m limit --limit 3/min -j LOG --log-prefix "[UFW LIMIT BLOCK] "
-A ufw-user-limit -j REJECT --reject-with icmp-port-unreachable
-A ufw-user-limit-accept -j ACCEPT
COMMIT
# Completed on Sun Jun 21 16:46:49 2015
E ufw status numbered
:
Status: active
To Action From
-- ------ ----
[ 1] 22022/tcp ALLOW IN Anywhere
[ 2] 2222/tcp ALLOW IN Anywhere
tcpdump
output sarebbero i log del firewall. Anche se la tua macchina virtuale potrebbe rispondere alla richiesta, chi può dire che l'host non la lascia uscire? Inoltre, presumo che l'inoltro IPv4 sia abilitato nel tuo sistema? DNAT avrebbe funzionato in entrambi i modi, ma solo se il pacchetto fosse lasciato fuoriuscire.