{"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\/et\/blog\/administrirovanie\/kak-trablshutit-otechestvennyj-ipsec-vpn-chast-1","title":{"rendered":"Kuidas t\u00f5rkeotsida kodumaist IPsec VPN-i. Osa 1","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\"Kuidas
\n<\/p>\n

Situatsioon<\/h3>\n

\nL\u00f5pp. Joon kohvi. \u00dcli\u00f5pilane seadistas VPN-\u00fchenduse kahe punkti vahel ja kadus. Kontrollin: tunnel on t\u00f5epoolest olemas, kuid tunnelis pole liiklust. \u00dcli\u00f5pilane ei vasta k\u00f5nedele.<\/p>\n

Panen vee keema ja sukeldun S-Terra Gateway troubleshootingusse. Jagun oma kogemusi ja metoodikat.
\n<\/a><\/noindex><\/p>\n

Algandmed<\/h3>\n

\nKahe territoriaalselt eraldatud asukoha vahel on GRE tunnel. GRE tuleb kr\u00fcpteerida:<\/p>\n

\"Kuidas
\n
\nKontrollin GRE tunneli t\u00f6\u00f6kindlust. Selleks k\u00e4ivitan ping-k\u00e4sku seadmest R1 GRE liidese suunal seadmele R2. See on sihtliiklus kr\u00fcpteerimiseks. Vastust ei tule:<\/p>\n

root@R1:~# ping 1.1.1.2 -c 4\nPING 1.1.1.2 (1.1.1.2) 56(84) baitide andmeid.\n\n--- 1.1.1.2 ping statistika ---\n4 paketti saadetud, 0 vastatud, 100% pakettide kadu, aeg 3057ms<\/code><\/pre>\n
\nVaatan logisid Gate1 ja Gate2. Logi r\u00f5\u00f5msalt teatab, et IPsec tunnel on edukalt seadistatud, mingeid probleeme ei ole:<\/p>\n
root@Gate1:~# cat \/var\/log\/cspvpngate.log\nAug  5 16:14:23 localhost  vpnsvc: 00100119  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
\nIPsec tunneli statistikas Gate1 n\u00e4en, et tunnel on t\u00f5epoolest olemas, kuid vastuv\u00f5tukood on nullitud:<\/p>\n
root@Gate1:~# sa_mgr show\nISAKMP seansid: 0 algatatud, 0 vastatud\n\nISAKMP \u00fchendused:\nNum Conn-id (Paikne Aadress,Port)-(Kaugn\u00e4idik Aadress,Port) Oleku Saadetud Vastuv\u00f5etud\n1 3 (10.10.10.251,500)-(10.10.10.252,500) aktiivne 1070 1014\n\nIPsec \u00fchendused:\nNum Conn-id (Paikne Aadress,Port)-(Kaugn\u00e4idik Aadress,Port) Protokoll Tegevus T\u00fc\u00fcp Saadetud Vastuv\u00f5etud\n1 3 (172.16.0.1,*)-(172.17.0.1,*) 47 ESP tunn 480 0<\/code><\/pre>\n
\nTroubleshootin S-Terra nii: otsin, kus sihtpaketid kaovad teel R1-st R2-sse. Protsessi k\u00e4igus (spoiler) leian vea.<\/p>\n
Troubleshooting<\/h3>\n
\nSamm 1. Mida Gate1 R1-lt saab<\/b><\/p>\n
Kasutades sisseehitatud paketisnifferit \u2013 tcpdump. K\u00e4ivitan snifferi sisesel (Gi0\/1 Cisco-sarnases m\u00e4rgistus v\u00f5i eth1 Debian OS-s) liidesele:<\/p>\n
root@Gate1:~# tcpdump -i eth1\n\ntcpdump: \u00fcksikasjalik v\u00e4ljund on peidetud, kasutage -v v\u00f5i -vv t\u00e4isprotokolli dekodeerimiseks\nkuulan eth1, link-t\u00fc\u00fcp EN10MB (Ethernet), salvestamismaht 262144 baiti\n14:53:38.879525 IP 172.16.0.1 > 172.17.0.1: GREv0, v\u00f5tme=0x1, pikkus 92: IP 1.1.1.1 > 1.1.1.2: ICMP echo request, id 2083, j\u00e4rjestus 1, pikkus 64\n14:53:39.896869 IP 172.16.0.1 > 172.17.0.1: GREv0, v\u00f5tme=0x1, pikkus 92: IP 1.1.1.1 > 1.1.1.2: ICMP echo request, id 2083, j\u00e4rjestus 2, pikkus 64\n14:53:40.921121 IP 172.16.0.1 > 172.17.0.1: GREv0, v\u00f5tme=0x1, pikkus 92: IP 1.1.1.1 > 1.1.1.2: ICMP echo request, id 2083, j\u00e4rjestus 3, pikkus 64\n14:53:41.944958 IP 172.16.0.1 > 172.17.0.1: GREv0, v\u00f5tme=0x1, pikkus 92: IP 1.1.1.1 > 1.1.1.2: ICMP echo request, id 2083, j\u00e4rjestus 4, pikkus 64<\/code><\/pre>\n
\nN\u00e4en, et Gate1 saab R1-lt GRE pakette. Liigun edasi.<\/p>\n
Samm 2. Mida Gate1 GRE pakkidega teeb<\/b><\/p>\n
T\u00f6\u00f6riistaga klogview vaatan, mis juhtub GRE pakettidega sees VPN<\/a> S-Terra draiver:<\/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
\nN\u00e4en, et sihitud GRE liiklus (proto 47) 172.16.0.1 -> 172.17.0.1 l\u00e4bis (PASS) kr\u00fcptokaardi LIST reegli ja kr\u00fcpteeriti (encapsulated). Edasi pakett suunati (passed out). Vastusliiklust klogview v\u00e4ljundis ei ole.<\/p>\n
Kontrollin p\u00e4\u00e4suliste nimekirja seadmes Gate1. N\u00e4en \u00fchte p\u00e4\u00e4suliste nimekirja LIST, mis m\u00e4\u00e4ratleb sihitud liikluse kr\u00fcptimiseks, seega M\u00c4 reegleid ei ole seadistatud:<\/p>\n
Gate1#show access-lists\nExtended IP access list LIST\n    10 lubada gre host 172.16.0.1 host 172.17.0.1<\/code><\/pre>\n
\nV\u00e4ljund: probleem ei ole seadmes Gate1.<\/p>\n
Lisainfot klogview kohta<\/b><\/p>\n
VPN draiver t\u00f6\u00f6tleb kogu v\u00f5rgu liiklust, mitte ainult seda, mis peab olema kr\u00fcpteeritud. Sellised s\u00f5numid on n\u00e4htavad klogview's, kui VPN draiver t\u00f6\u00f6tles v\u00f5rgu liiklust ja edastas selle kr\u00fcpteerimata kujul:<\/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
\nN\u00e4en, et ICMP liiklus (proto 1) 172.16.0.1->172.17.0.1 ei l\u00e4inud (no match) kr\u00fcptokaardi CMAP reeglite alla. Pakett suunati (passed out) avatud kujul.<\/p>\n
Samm 3. Mida Gate2 saab Gate1-lt<\/b><\/p>\n
K\u00e4ivitan snifferi WAN (eth0) liidesele Gate2-l:<\/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
\nN\u00e4en, et Gate2 saab ESP pakette Gate1-lt.<\/p>\n
Samm 4. Mida Gate2 teeb ESP paketidega<\/b><\/p>\n
K\u00e4ivitan utiliidi klogview Gate2-l:<\/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
\nN\u00e4en, et ESP paketid (proto 50) on langenud (DROP) tulek\u00e4igu (firewall) reegli (L3VPN) t\u00f5ttu. Veendun, et Gi0\/0-ga on t\u00f5epoolest seotud p\u00e4\u00e4suliste nimekirjad L3VPN:<\/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
\nProbleem on tuvastatud.<\/p>\n
Samm 5. Mis on valesti p\u00e4\u00e4suliste nimekirjaga
\n<\/b>
\nVaatan, mis p\u00e4\u00e4suliste nimekirja L3VPN sisaldab:<\/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
\nN\u00e4en, et ISAKMP-paketid on lubatud, seet\u00f5ttu luuakse IPsec tunnel. Kuid ESP jaoks pole lubavat reeglit. Tundub, et tudeng segas icmp ja esp \u00e4ra.<\/p>\n
Muudan ligip\u00e4\u00e4suloendit:<\/p>\n
Gate2(config)#\nip access-list extended L3VPN\nno 30\n30 permit esp host 10.10.10.251 any<\/code><\/pre>\n
\nSamm 6. Kontrollin t\u00f6\u00f6v\u00f5imet<\/b><\/p>\n
Esiteks veendun, et L3VPN ligip\u00e4\u00e4suloend on \u00f5ige:<\/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
\nN\u00fc\u00fcd k\u00e4ivitan sihttalve seadmest 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
\nV\u00f5it. GRE tunnel on loodud. IPsec statistikas on sissetuleva liikluse loendur mitte-null:<\/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 1474 1350\n\nIPsec connections:\nNum Conn-id (Local Addr,Port)-(Remote Addr,Port) Protocol Action Type Sent Rcvd\n1 4 (172.16.0.1,*)-(172.17.0.1,*) 47 ESP tunn 1920 480<\/code><\/pre>\n
\nGate2 moodulis klogview ilmuvad s\u00f5numid, et sihttale 172.16.0.1->172.17.0.1 on edukalt (PASS) dekodeeritud (decapsulated) reegli LIST kaudu kr\u00fcptokaardil 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
\nSummary<\/b><\/p>\n
Tudeng rikkus v\u00e4ljundit. 
\nOle ettevaatlik reeglite osas.<\/p>\n
Anon\u00fc\u00fcmne insener
\nt.me\/anonimous_engineer<\/i>
\n
Allikas: habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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