sekarang saya dapat ssh
meng-host melalui internet dan ssh
dari host ke mesin virtual. Yang ingin saya lakukan adalah ssh
langsung ke mesin Tamu dari luar.
Saya mencoba melakukan ini menggunakan iptables
:
iptables -t nat -A PREROUTING -m tcp -p tcp --dport 2222 -j DNAT --to-destination 192.168.130.128:22
Dan juga membuka port terkait ini di UFW
:
ufw allow routed
ufw allow outgoing
ufw deny incoming
ufw allow 2222/tcp
Setelah memuat ulang firewall, remote ssh
akan membeku debug1: Connecting to x.x.x.x [x.x.x.x] port 2222
dan menggunakan tcpdump -i vmnet8 'port 22'
saya bisa melihat ini:
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
pada MacOS
tamu saya akan menghasilkan hal yang sama.
- PEMBAWA ACARA: Ubuntu 14.04
- TAMU: mac os mavericks
- platform virtualisasi: Vmware workstation 11
Memperbarui:
Ini adalah ufw
pesan log (log tinggi):
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
Dan saya menggunakan perintah ini untuk mendapatkan log paket yang dijatuhkan:
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
Tapi saya tidak bisa melacak dropped
paket apa pun .
Pembaruan 2:
konfigurasi iptables karena beberapa teman meminta:
# 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
Dan ufw status numbered
:
Status: active
To Action From
-- ------ ----
[ 1] 22022/tcp ALLOW IN Anywhere
[ 2] 2222/tcp ALLOW IN Anywhere
tcpdump
keluaran Anda adalah log firewall. Meskipun VM Anda dapat menanggapi permintaan, siapa bilang tuan rumah tidak menjatuhkannya saat keluar? Juga, saya kira penerusan IPv4 diaktifkan di sistem Anda? DNAT akan bekerja dua arah, tetapi hanya jika paket dibiarkan pada jalan keluarnya.