{"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\/ro\/blog\/administrirovanie\/kak-trablshutit-otechestvennyj-ipsec-vpn-chast-1","title":{"rendered":"Cum s\u0103 depanezi o VPN IPsec local\u0103. Partea 1","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\"Cum
\n<\/p>\n

Situa\u021bia<\/h3>\n

\nIe\u0219ire. Beau cafea. Studentul a configurat o conexiune VPN \u00eentre dou\u0103 puncte \u0219i a disp\u0103rut. Verific: tunelul exist\u0103 cu adev\u0103rat, dar nu exist\u0103 trafic \u00een tunel. Nu r\u0103spunde la apeluri.<\/p>\n

Pun ceainicul la fiert \u0219i m\u0103 dedic depan\u0103rii S-Terra Gateway. \u00cemi \u00eemp\u0103rt\u0103\u0219esc experien\u021ba \u0219i metodologia.
\n<\/a><\/noindex><\/p>\n

Datele originale<\/h3>\n

\nDou\u0103 loca\u021bii separate geografic sunt conectate printr-un tunel GRE. GRE trebuie criptat:<\/p>\n

\"Cum
\n
\nVerific func\u021bionalitatea tunelului GRE. Pentru aceasta \u00eencepe s\u0103 faci ping de pe dispozitivul R1 c\u0103tre interfa\u021ba GRE a dispozitivului R2. Acesta este traficul \u021bint\u0103 pentru criptare. Nu exist\u0103 r\u0103spuns:<\/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
\nPrivesc jurnalele de pe Gate1 \u0219i Gate2. Logul anun\u021b\u0103 cu bucurie c\u0103 tunelul IPsec a fost stabilit cu succes, f\u0103r\u0103 probleme:<\/p>\n
root@Gate1:~# cat \/var\/log\/cspvpngate.log\nAug  5 16:14:23 localhost  vpnsvc: 00100119  Conexiune IPSec 5 stabilit\u0103, selector de trafic 172.17.0.1->172.16.0.1, proto 47, peer 10.10.10.251, id \"10.10.10.251\", Filtre \nIPsec:Protect:CMAP:1:LIST, IPsecAction IPsecAction:CMAP:1, IKERule IKERule:CMAP:1<\/code><\/pre>\n
\n\u00cen statisticile tunelului IPsec de pe Gate1 v\u0103d c\u0103 tunelul exist\u0103 cu adev\u0103rat, dar contorul Rcvd este resetat:<\/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
\nDepanez S-Terra astfel: caut unde se pierd pachetele \u021bint\u0103 pe ruta de la R1 la R2. \u00cen proces (spoiler) voi g\u0103si o eroare.<\/p>\n
Troubleshooting<\/h3>\n
\nPasul 1. Ce prime\u0219te Gate1 de la R1<\/b><\/p>\n
Folosesc snifferul de pachete integrat \u2013 tcpdump. \u00cencep snifferul pe interfa\u021ba intern\u0103 (Gi0\/1 \u00een nota\u021bia Cisco-like sau eth1 \u00een nota\u021bia sistemului de operare Debian):<\/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
\nV\u0103d c\u0103 Gate1 prime\u0219te de la R1 pachete GRE. Merg mai departe.<\/p>\n
Pasul 2. Ce face Gate1 cu pachetele GRE<\/b><\/p>\n
Folosind utilitarul klogview privesc ce se \u00eent\u00e2mpl\u0103 cu pachetele GRE \u00een interior VPN<\/a> driver-ului S-Terra:<\/p>\n
root@Gate1:~# klogview -f 0xffffffff\n\nrezultatul filtr\u0103rii pentru pachetul de ie\u0219ire 172.16.0.1->172.17.0.1, proto 47, len 112, if eth0: lan\u021b 4 \"IPsecPolicy:CMAP\", filtru 8, id eveniment IPsec:Protect:CMAP:1:LIST, status PASS\nencapsul\u00e2nd cu SA 31: 172.16.0.1->172.17.0.1, proto 47, len 112, if eth0\npachet ie\u0219ire 10.10.10.251->10.10.10.252, proto 50, len 160, if eth0: encapsulat\n<\/code><\/pre>\n
\nV\u0103d c\u0103 traficul GRE \u021bint\u0103 (proto 47) 172.16.0.1 -> 172.17.0.1 a trecut (PASS) sub regula de criptare LIST \u00een planul de criptare CMAP \u0219i a fost criptat (encapsulated). Mai departe, pachetul a fost rutat (passed out). Nu exist\u0103 trafic de r\u0103spuns \u00een ie\u0219irea klogview.<\/p>\n
Verific listele de acces pe dispozitivul Gate1. V\u0103d o list\u0103 de acces LIST, care define\u0219te traficul \u021bint\u0103 pentru criptare, ceea ce \u00eenseamn\u0103 c\u0103 regulile MEP nu sunt configurate:<\/p>\n
Gate1#show access-lists\nLista de acces IP extins\u0103 LIST\n    10 permit gre host 172.16.0.1 host 172.17.0.1<\/code><\/pre>\n
\nConcluzie: problema nu este pe dispozitivul Gate1.<\/p>\n
Informa\u021bii suplimentare despre klogview<\/b><\/p>\n
Driverul VPN proceseaz\u0103 tot traficul de re\u021bea, nu doar cel care trebuie criptat. Mesaje de acest gen sunt vizibile \u00een klogview, dac\u0103 driverul VPN a procesat traficul de re\u021bea \u0219i l-a transmis \u00een form\u0103 necriptat\u0103:<\/p>\n
root@R1:~# ping 172.17.0.1 -c 4<\/code><\/pre>\n
<\/p>\n
root@Gate1:~# klogview -f 0xffffffff\n\nrezultatul filtr\u0103rii pentru pachetul de ie\u0219ire 172.16.0.1->172.17.0.1, proto 1, len 84, if eth0: lan\u021b 4 \"IPsecPolicy:CMAP\": f\u0103r\u0103 potrivire\npachet ie\u0219ire 172.16.0.1->172.17.0.1, proto 1, len 84, if eth0: filtrat<\/code><\/pre>\n
\nV\u0103d c\u0103 traficul ICMP (proto 1) 172.16.0.1->172.17.0.1 nu a trecut (no match) prin regulile de criptare ale planului CMAP. Pachetul a fost rutat (passed out) \u00een form\u0103 deschis\u0103.<\/p>\n
Pasul 3. Ce prime\u0219te Gate2 de la Gate1<\/b><\/p>\n
Lansez un sniffing pe interfa\u021ba WAN (eth0) a Gate2:<\/p>\n
root@Gate2:~# tcpdump -i eth0\ntcpdump: output detaliat restric\u021bionat, folosi\u021bi -v sau -vv pentru decodificarea complet\u0103 a protocolului\nascult\u00e2nd pe eth0, tip leg\u0103tur\u0103 EN10MB (Ethernet), dimensiunea capturii 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
\nV\u0103d c\u0103 Gate2 prime\u0219te pachete ESP de la Gate1.<\/p>\n
Pasul 4. Ce face Gate2 cu pachetele ESP<\/b><\/p>\n
Lansez utilitarul klogview pe Gate2:<\/p>\n
root@Gate2:~# klogview -f 0xffffffff\nrezultatul filtr\u0103rii pentru pachetul de intrare 10.10.10.251->10.10.10.252, proto 50, len 160, if eth0: lan\u021b 17 \"FilterChain:L3VPN\", filtru 21, status DROP\npachet de intrare eliminat 10.10.10.251->10.10.10.252, proto 50, len 160, if eth0: firewall\n<\/code><\/pre>\n
\nV\u0103d c\u0103 pachetele ESP (proto 50) au fost respinse (DROP) de regula (L3VPN) a firewall-ului. Verific c\u0103 lista de acces L3VPN este \u00eentr-adev\u0103r asociat\u0103 cu Gi0\/0:<\/p>\n
Gate2#show ip interface gi0\/0\nGigabitEthernet0\/0 este activ, protocolul de linie este activ\n  Adresa Internet este 10.10.10.252\/24\n  MTU este 1500 bytes\n  Lista de acces pentru ie\u0219ire nu este setat\u0103\n  Lista de acces pentru intrare este L3VPN<\/code><\/pre>\n
\nAm identificat problema.<\/p>\n
Pasul 5. Ce nu este \u00een regul\u0103 cu lista de acces
\n<\/b>
\nVerific ce reprezint\u0103 lista de acces L3VPN:<\/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
\nObserv c\u0103 pachetele ISAKMP sunt permise, a\u0219adar se stabile\u0219te un tunel IPsec. Totu\u0219i, nu exist\u0103 nicio regul\u0103 de permisiune pentru ESP. Se pare c\u0103 studentul a confundat icmp cu esp.<\/p>\n
Corectez lista de acces:<\/p>\n
Gate2(config)#\nip access-list extended L3VPN\nno 30\n30 permit esp host 10.10.10.251 any<\/code><\/pre>\n
\nPasul 6. Verific func\u021bionalitatea<\/b><\/p>\n
\u00cen primul r\u00e2nd, m\u0103 asigur c\u0103 lista de acces L3VPN este corect\u0103:<\/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
\nAcum, de pe dispozitivul R1, ini\u021biez traficul \u021bint\u0103:<\/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
\nVictorie. Tunelul GRE s-a stabilit. Contorul traficului de intrare din statistica IPsec nu este nul:<\/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
\nPe gateway-ul Gate2, \u00een ie\u0219irea klogview au ap\u0103rut mesaje c\u0103 traficul \u021bint\u0103 172.16.0.1->172.17.0.1 a fost decriptat cu succes (PASS) de regula LIST \u00een harta criptografic\u0103 CMAP:<\/p>\n
root@Gate2:~# klogview -f 0xffffffff\nrezultatul filtr\u0103rii pentru pachetul de intrare 172.16.0.1->172.17.0.1, proto 47, len 112, if eth0: lan\u021b 18 \"IPsecPolicy:CMAP\", filtru 25, id eveniment IPsec:Protect:CMAP:1:LIST, status PASS\npachet de intrare 172.16.0.1->172.17.0.1, proto 47, len 112, if eth0: decapsulat<\/code><\/pre>\n
\nConcluzii<\/b><\/p>\n
Studentul a stricat ie\u0219irea. 
\nFii mai atent cu regulile ME.<\/p>\n
Inginer anonim
\nt.me\/anonimous_engineer<\/i>
\n
Sursa: habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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