{"id":91646,"date":"2020-08-16T07:42:09","date_gmt":"2020-08-16T05:42:09","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/kak-trablshutit-otechestvennyj-ipsec-vpn-chast-1"},"modified":"2020-08-16T07:42:09","modified_gmt":"2020-08-16T05:42:09","slug":"kak-trablshutit-otechestvennyj-ipsec-vpn-chast-1","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/administrirovanie\/kak-trablshutit-otechestvennyj-ipsec-vpn-chast-1","title":{"rendered":"Hur man fels\u00f6ker inhemsk IPsec VPN. Del 1","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\"Hur
\n<\/p>\n

Situation<\/h3>\n

\nUte. Jag dricker kaffe. Studenten har st\u00e4llt in VPN-anslutningen mellan tv\u00e5 punkter och f\u00f6rsvann. Jag kollar: tunneln existerar faktiskt, men det finns ingen trafik i tunneln. Studenten svarar inte p\u00e5 samtal.<\/p>\n

Jag s\u00e4tter p\u00e5 vattenkokaren och dyker in i fels\u00f6kningen av C-Terra Gateway. Jag delar med mig av min erfarenhet och metodik.
\n<\/a><\/noindex><\/p>\n

Ursprungliga data<\/h3>\n

\nTv\u00e5 geografiskt \u00e5tskilda platser \u00e4r kopplade via en GRE-tunnel. GRE m\u00e5ste krypteras:<\/p>\n

\"Hur
\n
\nJag kontrollerar funktionen av GRE-tunneln. F\u00f6r detta k\u00f6r jag ping fr\u00e5n enhet R1 till GRE-gr\u00e4nssnittet p\u00e5 enhet R2. Detta \u00e4r den m\u00e5ltrafik som ska krypteras. Inget svar:<\/p>\n

root@R1:~# ping 1.1.1.2 -c 4\nPING 1.1.1.2 (1.1.1.2) 56(84) bytes of data.\n\n--- 1.1.1.2 ping statistics ---\n4 packets transmitted, 0 received, 100% packet loss, time 3057ms<\/code><\/pre>\n
\nJag kollar loggarna p\u00e5 Gate1 och Gate2. Loggen rapporterar glatt att IPsec-tunneln har etablerats framg\u00e5ngsrikt, inga problem:<\/p>\n
root@Gate1:~# cat \/var\/log\/cspvpngate.log\nAug  5 16:14:23 localhost  vpnsvc: 00100119 <4:1> IPSec connection 5 established, traffic selector 172.17.0.1->172.16.0.1, proto 47, peer 10.10.10.251, id "10.10.10.251", Filter \nIPsec:Protect:CMAP:1:LIST, IPsecAction IPsecAction:CMAP:1, IKERule IKERule:CMAP:1<\/code><\/pre>\n
\nI statistiken f\u00f6r IPsec-tunneln p\u00e5 Gate1 ser jag att tunneln faktiskt finns, men Rcvd-r\u00e4knaren \u00e4r nollad:<\/p>\n
root@Gate1:~# sa_mgr show\nISAKMP sessions: 0 initiated, 0 responded\n\nISAKMP connections:\nNum Conn-id (Local Addr,Port)-(Remote Addr,Port) State Sent Rcvd\n1 3 (10.10.10.251,500)-(10.10.10.252,500) active 1070 1014\n\nIPsec connections:\nNum Conn-id (Local Addr,Port)-(Remote Addr,Port) Protocol Action Type Sent Rcvd\n1 3 (172.16.0.1,*)-(172.17.0.1,*) 47 ESP tunn 480 0<\/code><\/pre>\n
\nJag fels\u00f6ker C-Terra p\u00e5 detta s\u00e4tt: jag letar efter var m\u00e5lpaketen f\u00f6rsvinner p\u00e5 v\u00e4gen fr\u00e5n R1 till R2. Under processen (spoiler) hittar jag ett fel.<\/p>\n
Fels\u00f6kning<\/h3>\n
\nSteg 1. Vad f\u00e5r Gate1 fr\u00e5n R1<\/b><\/p>\n
Jag anv\u00e4nder den inbyggda paketssniffern \u2013 tcpdump. Jag startar sniffaren p\u00e5 det interna (Gi0\/1 i Cisco-liknande notation eller eth1 i Debian OS-notation) gr\u00e4nssnittet:<\/p>\n
root@Gate1:~# tcpdump -i eth1\n\ntcpdump: verbose output suppressed, use -v or -vv for full protocol decode\nlistening on eth1, link-type EN10MB (Ethernet), capture size 262144 bytes\n14:53:38.879525 IP 172.16.0.1 > 172.17.0.1: GREv0, key=0x1, length 92: IP 1.1.1.1 > 1.1.1.2: ICMP echo request, id 2083, seq 1, length 64\n14:53:39.896869 IP 172.16.0.1 > 172.17.0.1: GREv0, key=0x1, length 92: IP 1.1.1.1 > 1.1.1.2: ICMP echo request, id 2083, seq 2, length 64\n14:53:40.921121 IP 172.16.0.1 > 172.17.0.1: GREv0, key=0x1, length 92: IP 1.1.1.1 > 1.1.1.2: ICMP echo request, id 2083, seq 3, length 64\n14:53:41.944958 IP 172.16.0.1 > 172.17.0.1: GREv0, key=0x1, length 92: IP 1.1.1.1 > 1.1.1.2: ICMP echo request, id 2083, seq 4, length 64<\/code><\/pre>\n
\nJag ser att Gate1 tar emot GRE-paket fr\u00e5n R1. Jag forts\u00e4tter.<\/p>\n
Steg 2. Vad g\u00f6r Gate1 med GRE-paketen<\/b><\/p>\n
Med verktyget klogview ser jag vad som h\u00e4nder med GRE-paketen inuti VPN<\/a> C-Terra-drivrutinen:<\/p>\n
root@Gate1:~# klogview -f 0xffffffff\n\nfiltration result for out packet 172.16.0.1->172.17.0.1, proto 47, len 112, if eth0: chain 4 "IPsecPolicy:CMAP", filter 8, event id IPsec:Protect:CMAP:1:LIST, status PASS\nencapsulating with SA 31: 172.16.0.1->172.17.0.1, proto 47, len 112, if eth0\npassed out packet 10.10.10.251->10.10.10.252, proto 50, len 160, if eth0: encapsulated\n<\/code><\/pre>\n
\nJag ser att den m\u00e5linriktade GRE-trafiken (proto 47) 172.16.0.1 -> 172.17.0.1 har passerat (PASS) under krypteringsregeln LIST i kryptokartan CMAP och har krypterats (encapsulated). Paketet har sedan vidarebefordrats (passed out). Inga svarstrafik finns i klogview-utdata.<\/p>\n
Jag kontrollerar \u00e5tkomstlistor p\u00e5 enheten Gate1. Jag ser en \u00e5tkomstlista LIST som definierar den m\u00e5linriktade trafiken f\u00f6r kryptering, s\u00e5 det finns inga regler f\u00f6r M\u00c4 inst\u00e4llda:<\/p>\n
Gate1#show access-lists\nExtended IP access list LIST\n    10 permit gre host 172.16.0.1 host 172.17.0.1<\/code><\/pre>\n
\nSlutsats: problemet \u00e4r inte p\u00e5 enheten Gate1.<\/p>\n
Ytterligare information om klogview<\/b><\/p>\n
VPN-drivrutinen hanterar all n\u00e4tverkstrafik, inte bara den som ska krypteras. S\u00e5dana meddelanden syns i klogview om VPN-drivrutinen har bearbetat n\u00e4tverkstrafik och skickat den i okrypterad form:<\/p>\n
root@R1:~# ping 172.17.0.1 -c 4<\/code><\/pre>\n
<\/p>\n
root@Gate1:~# klogview -f 0xffffffff\n\nfiltration result for out packet 172.16.0.1->172.17.0.1, proto 1, len 84, if eth0: chain 4 "IPsecPolicy:CMAP": no match\npassed out packet 172.16.0.1->172.17.0.1, proto 1, len 84, if eth0: filtered<\/code><\/pre>\n
\nJag ser att ICMP-trafiken (proto 1) 172.16.0.1->172.17.0.1 inte matchade (no match) med krypteringsreglerna i kryptokarten CMAP. Paketet har vidarebefordrats (passed out) i okrypterad form.<\/p>\n
Steg 3. Vad f\u00e5r Gate2 fr\u00e5n Gate1<\/b><\/p>\n
Jag startar en sniffare p\u00e5 WAN (eth0) gr\u00e4nssnittet p\u00e5 Gate2:<\/p>\n
root@Gate2:~# tcpdump -i eth0\ntcpdump: verbose output suppressed, use -v or -vv for full protocol decode\nlistening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes\n16:05:45.104195 IP 10.10.10.251 > 10.10.10.252: ESP(spi=0x30088112,seq=0x1), length 140\n16:05:46.093918 IP 10.10.10.251 > 10.10.10.252: ESP(spi=0x30088112,seq=0x2), length 140\n16:05:47.117078 IP 10.10.10.251 > 10.10.10.252: ESP(spi=0x30088112,seq=0x3), length 140\n16:05:48.141785 IP 10.10.10.251 > 10.10.10.252: ESP(spi=0x30088112,seq=0x4), length 140<\/code><\/pre>\n
\nJag ser att Gate2 f\u00e5r ESP-paket fr\u00e5n Gate1.<\/p>\n
Steg 4. Vad g\u00f6r Gate2 med ESP-paketen<\/b><\/p>\n
Jag startar klogview-verktyget p\u00e5 Gate2:<\/p>\n
root@Gate2:~# klogview -f 0xffffffff\nfiltration result for in packet 10.10.10.251->10.10.10.252, proto 50, len 160, if eth0: chain 17 "FilterChain:L3VPN", filter 21, status DROP\ndropped in packet 10.10.10.251->10.10.10.252, proto 50, len 160, if eth0: firewall\n<\/code><\/pre>\n
\nJag ser att ESP-paketen (proto 50) har avvisats (DROP) av regeln (L3VPN) i brandv\u00e4ggen (firewall). Jag kontrollerar att L3VPN-\u00e5tkomstlistan faktiskt \u00e4r kopplad till Gi0\/0:<\/p>\n
Gate2#show ip interface gi0\/0\nGigabitEthernet0\/0 is up, line protocol is up\n  Internet address is 10.10.10.252\/24\n  MTU is 1500 bytes\n  Outgoing access list is not set\n  Inbound  access list is L3VPN<\/code><\/pre>\n
\nProblemet har identifierats.<\/p>\n
Steg 5. Vad \u00e4r fel med \u00e5tkomstlistan
\n<\/b>
\nJag kontrollerar vad \u00e5tkomstlistan L3VPN inneh\u00e5ller:<\/p>\n
Gate2#show access-list L3VPN\nExtended IP access list L3VPN\n    10 permit udp host 10.10.10.251 any eq isakmp\n    20 permit udp host 10.10.10.251 any eq non500-isakmp\n    30 permit icmp host 10.10.10.251 any<\/code><\/pre>\n
\nJag ser att ISAKMP-paket \u00e4r till\u00e5tna, s\u00e5 en IPsec-tunnel uppr\u00e4ttas. Men det finns ingen till\u00e5telse f\u00f6r ESP. Tydligen blandade studenten ihop icmp och esp.<\/p>\n
Jag \u00e4ndrar \u00e5tkomstlistan:<\/p>\n
Gate2(config)#\nip access-list extended L3VPN\nno 30\n30 permit esp host 10.10.10.251 any<\/code><\/pre>\n
\nSteg 6. Jag kontrollerar funktionaliteten<\/b><\/p>\n
F\u00f6rst f\u00f6rs\u00e4krar jag mig om att \u00e5tkomstlistan L3VPN \u00e4r korrekt:<\/p>\n
Gate2#show access-list L3VPN\nExtended IP access list L3VPN\n    10 permit udp host 10.10.10.251 any eq isakmp\n    20 permit udp host 10.10.10.251 any eq non500-isakmp\n    30 permit esp host 10.10.10.251 any<\/code><\/pre>\n
\nNu startar jag m\u00e5ltrafiken fr\u00e5n enhet R1:<\/p>\n
root@R1:~# ping 1.1.1.2 -c 4\nPING 1.1.1.2 (1.1.1.2) 56(84) bytes of data.\n64 bytes from 1.1.1.2: icmp_seq=1 ttl=64 time=35.3 ms\n64 bytes from 1.1.1.2: icmp_seq=2 ttl=64 time=3.01 ms\n64 bytes from 1.1.1.2: icmp_seq=3 ttl=64 time=2.65 ms\n64 bytes from 1.1.1.2: icmp_seq=4 ttl=64 time=2.87 ms\n\n--- 1.1.1.2 ping statistics ---\n4 packets transmitted, 4 received, 0% packet loss, time 3006ms\nrtt min\/avg\/max\/mdev = 2.650\/10.970\/35.338\/14.069 ms<\/code><\/pre>\n
\nSeger. GRE-tunneln har uppr\u00e4ttats. Mottagen trafik i IPsec-statistiken \u00e4r inte noll:<\/p>\n
root@Gate1:~# sa_mgr show\nISAKMP-sessioner: 0 initierade, 0 svarade\n\nISAKMP-anslutningar:\nNum Conn-id (Local Addr,Port)-(Remote Addr,Port) State Sent Rcvd\n1 3 (10.10.10.251,500)-(10.10.10.252,500) aktiv 1474 1350\n\nIPsec-anslutningar:\nNum Conn-id (Local Addr,Port)-(Remote Addr,Port) Protokoll \u00c5tg\u00e4rd Typ Sent Rcvd\n1 4 (172.16.0.1,*)-(172.17.0.1,*) 47 ESP tunn 1920 480<\/code><\/pre>\n
\nP\u00e5 gateway Gate2 har meddelanden dykt upp i klogview som visar att m\u00e5ltrafiken 172.16.0.1->172.17.0.1 framg\u00e5ngsrikt (PASS) dekrypterades (decapsulated) av regeln LIST i kryptokartan CMAP:<\/p>\n
root@Gate2:~# klogview -f 0xffffffff\nfiltration result for in packet 172.16.0.1->172.17.0.1, proto 47, len 112, if eth0: chain 18 "IPsecPolicy:CMAP", filter 25, event id IPsec:Protect:CMAP:1:LIST, status PASS\npassed in packet 172.16.0.1->172.17.0.1, proto 47, len 112, if eth0: decapsulated<\/code><\/pre>\n
\nSammanfattning<\/b><\/p>\n
Studenten f\u00f6rst\u00f6rde utg\u00e5ngen. 
\nVar f\u00f6rsiktig med M\u00c4-regler.<\/p>\n
Anonym ingenj\u00f6r
\nt.me\/anonimous_engineer<\/i>
\n
K\u00e4lla: habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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