Eu tenho a instalação LibreSwan na instância AWS EC2 CentOS7, o túnel IPsec é estabelecido com o peer (Cisco ASA).
O túnel está em alta, mas eu não tenho tráfego. Eu não posso pingar os nós ao lado do peer.
Aqui está minha configuração.
na instância do AWS EC2
EC2 instance - running CentOS7
Public IP: A.B.C.D
Private IP: E.F.G.H
[toor@ip-E-F-G-H ~]# lsb_release -a
LSB Version: :core-4.1-amd64:core-4.1-noarch
Distributor ID: CentOS
Description: CentOS Linux release 7.5.1804 (Core)
Release: 7.5.1804
Codename: Core
[toor@ip-E-F-G-H ~]# ipsec version
Linux Libreswan 3.23 (netkey) on 3.10.0-862.3.2.el7.x86_64
[toor@ip-E-F-G-H ~]# ipsec version
Verifying installed system and configuration files
Version check and ipsec on-path [OK]
Libreswan 3.23 (netkey) on 3.10.0-862.3.2.el7.x86_64
Checking for IPsec support in kernel [OK]
NETKEY: Testing XFRM related proc values
ICMP default/send_redirects [OK]
ICMP default/accept_redirects [OK]
XFRM larval drop [OK]
Pluto ipsec.conf syntax [OK]
Two or more interfaces found, checking IP forwarding [OK]
Checking rp_filter [OK]
Checking that pluto is running [OK]
Pluto listening for IKE on udp 500 [OK]
Pluto listening for IKE/NAT-T on udp 4500 [OK]
Pluto ipsec.secret syntax [OK]
Checking 'ip' command [OK]
Checking 'iptables' command [OK]
Checking 'prelink' command does not interfere with FIPS [OK]
Checking for obsolete ipsec.conf options [OK]
Aqui está o meu ipsec.conf
config setup
logfile=/var/log/pluto.log
virtual_private=%v4:M.N.O.P/32,%v4:Q.R.S.T/32 #are encryption Domain of my peer
protostack=netkey
conn MyConnection
authby=secret
auto=start
type=tunnel
## phase1 ##
ike=aes256-sha1;modp2048
keyexchange=ike
## phase2 ##
phase2=esp
phase2alg=aes256-sha1;modp2048
compress=no
pfs=yes
left=%defaultroute
leftid=A.B.C.D #MyPublic Ip on AWS EC2
leftsourceip=E.F.G.H . #My private ip of my ec2 centos7 instance
leftsubnet=E.F.G.H/32
leftnexthop=%defaultroute
## MyPeer ##
right=I.J.K.L #Public ip of the peer - cisco asa device
rightsubnets={M.N.O.P/32,Q.R.S.T/32}
ikelifetime=28800s
salifetime=3600s
aggrmode=no
my ipsec.secrets
A.B.C.D I.J.K.L: PSK "*&^%$3434"
aqui é o status do ipsec
[toor@ip-E-F-G-H ~]# ipsec auto --status
000 "MyConnection/0x2": IKE algorithms: AES_CBC_256-HMAC_SHA1-MODP1536
000 "MyConnection/0x2": IKE algorithm newest: AES_CBC_256-HMAC_SHA1-MODP1536
000 "MyConnection/0x2": ESP algorithms: AES_CBC_256-HMAC_SHA1_96-MODP1536
000 "MyConnection/0x2": ESP algorithm newest: AES_CBC_256-HMAC_SHA1_96; pfsgroup=MODP1536
000
000 Total IPsec connections: loaded 2, active 2
000
000 State Information: DDoS cookies not required, Accepting new IKE connections
000 IKE SAs: total(1), half-open(0), open(0), authenticated(1), anonymous(0)
000 IPsec SAs: total(2), authenticated(2), anonymous(0)
000
000 #2: "MyConnection/0x1":4500 STATE_QUICK_I2 (sent QI2, IPsec SA established); EVENT_SA_REPLACE in 734s; newest IPSEC; eroute owner; isakmp#1; idle; import:admin initiate
000 #2: "MyConnection/0x1" [email protected] [email protected] [email protected] [email protected] ref=0 refhim=0 Traffic: ESPin=0B ESPout=4KB! ESPmax=4194303B
000 #1: "MyConnection/0x2":4500 STATE_MAIN_I4 (ISAKMP SA established); EVENT_SA_REPLACE in 25692s; newest ISAKMP; lastdpd=0s(seq in:0 out:0); idle; import:admin initiate
000 #3: "MyConnection/0x2":4500 STATE_QUICK_I2 (sent QI2, IPsec SA established); EVENT_SA_REPLACE in 524s; newest IPSEC; eroute owner; isakmp#1; idle; import:admin initiate
000 #3: "MyConnection/0x2" [email protected] [email protected] [email protected] [email protected] ref=0 refhim=0 Traffic: ESPin=0B ESPout=1KB! ESPmax=4194303B
000
000 Bare Shunt list:
000
aqui está minha rota -n cmd e não é possível executar ping nesses nós no domínio de criptografia do meu par
[toor@ip-E-F-G-H ~]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 E.F.0.1 0.0.0.0 UG 0 0 0 eth0
M.N.O.P E.F.0.1 255.255.255.255 UGH 0 0 0 eth0
Q.R.S.T E.F.0.1 255.255.255.255 UGH 0 0 0 eth0
E.F.0.0 0.0.0.0 255.255.240.0 U 0 0 0 eth0
[root@ip-E-F-G-H ~]#ping M.N.O.P
no reply
[root@ip-E-F-G-H ~]#ping Q.R.S.T
no reply
aqui está o meu iptables -L, não POSTROUTING
[root@ip-E-F-G-H ~]#iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
ACCEPT udp -- anywhere anywhere udp dpt:isakmp
ACCEPT tcp -- anywhere anywhere tcp dpt:ipsec-nat-t
ACCEPT udp -- anywhere anywhere udp dpt:ipsec-nat-t
ACCEPT esp -- anywhere anywhere
ACCEPT ah -- anywhere anywhere
Chain FORWARD (policy ACCEPT)
target prot opt source destination
ACCEPT all -- anywhere anywhere
ACCEPT all -- anywhere anywhere
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
[root@ip-E-F-G-H ~]#iptables -t nat -L -v -n
Chain PREROUTING (policy ACCEPT 19 packets, 1024 bytes)
pkts bytes target prot opt in out source destination
Chain INPUT (policy ACCEPT 19 packets, 1024 bytes)
pkts bytes target prot opt in out source destination
Chain OUTPUT (policy ACCEPT 305 packets, 127K bytes)
pkts bytes target prot opt in out source destination
Chain POSTROUTING (policy ACCEPT 305 packets, 127K bytes)
pkts bytes target prot opt in out source destination
Na instância do AWS EC2, eu desabilitei a verificação de origem / destino.
No grupo de segurança da instância do AWS EC2, eles foram adicionados na entrada
Type Protocol Port Range Source Description
All traffic All All M.N.O.P/32
All traffic All All Q.R.S.T/32
SSH TCP 22 0.0.0.0/0
Custom Protocol AH (51) All 0.0.0.0/0
Custom Protocol ESP (50) All 0.0.0.0/0
Custom UDP Rule UDP 4500 0.0.0.0/0
Custom UDP Rule UDP 500 0.0.0.0/0
All ICMP - IPv4 All N/A 0.0.0.0/0
No grupo de segurança da instância do AWS EC2, eles foram adicionados no envio de saída
Type Protocol Port Range Source Description
All traffic All All 0.0.0.0/0
All traffic All All M.N.O.P/32
All traffic All All Q.R.S.T/32
Na seção VPC, região para minha instância ec2 .. Adicionada na tabela de roteamento
Destination Target Status Propagated
E.F.0.0/16 local Active No
0.0.0.0/0 igw-747d3673hsd Active No
M.N.O.P/32 eni-0fec2be5-on-ec2 Active No
Q.R.S.T/32 eni-0fec2be5-on-ec2 Active No
Adicione também algumas ACLs de rede - entrada
Rule # Type Protocol Port Range Source Allow / Deny
100 ALL Traffic ALL ALL 0.0.0.0/0 ALLOW
200 ALL Traffic ALL ALL M.N.O.P/32 ALLOW
300 ALL Traffic ALL ALL Q.R.S.T/32 ALLOW
* ALL Traffic ALL ALL 0.0.0.0/0 DENY
Adicione também algumas ACLs de rede - saída
Rule # Type Protocol Port Range Source Allow / Deny
100 ALL Traffic ALL ALL 0.0.0.0/0 ALLOW
200 ALL Traffic ALL ALL M.N.O.P/32 ALLOW
300 ALL Traffic ALL ALL Q.R.S.T/32 ALLOW
* ALL Traffic ALL ALL 0.0.0.0/0 DENY
Isso é tudo - o túnel está em alta, com ecs centos7 com o Libreswan para o Cisco ASA. Mas sem tráfego, eu não posso pingar ou rastrear os nós atrás do firewall cisco asa. Qualquer ponteiros no lado aws é muito apreciado. obrigado
Eu tenho o cisco Admin para me mostrar o seu lado
aqui está a saída sh do crypto ipsec sa peer A.B.C.D
sh crypto ipsec sa peer A.B.C.D
peer address: A.B.C.D
Crypto map tag: TELCOCryptoMap, seq num: 690, local addr: I.J.K.L
access-list CRYPTO-NETXCELL-VPN extended permit ip host M.N.O.P host E.F.G.H
local ident (addr/mask/prot/port): (M.N.O.P/255.255.255.255/0/0)
remote ident (addr/mask/prot/port): (E.F.G.H/255.255.255.255/0/0)
current_peer: A.B.C.D
#pkts encaps: 0, #pkts encrypt: 0, #pkts digest: 0
#pkts decaps: 0, #pkts decrypt: 0, #pkts verify: 0
#pkts compressed: 0, #pkts decompressed: 0
#pkts not compressed: 0, #pkts comp failed: 0, #pkts decomp failed: 0
#pre-frag successes: 0, #pre-frag failures: 0, #fragments created: 0
#PMTUs sent: 0, #PMTUs rcvd: 0, #decapsulated frgs needing reassembly: 0
#TFC rcvd: 0, #TFC sent: 0
#Valid ICMP Errors rcvd: 0, #Invalid ICMP Errors rcvd: 0
#send errors: 0, #recv errors: 0
local crypto endpt.: I.J.K.L/4500, remote crypto endpt.: A.B.C.D/4500
path mtu 1500, ipsec overhead 82(52), media mtu 1500
PMTU time remaining (sec): 0, DF policy: copy-df
ICMP error validation: disabled, TFC packets: disabled
current outbound spi: 3F59926A
current inbound spi : D8CD619E
inbound esp sas:
spi: 0xD8CD619E (3637338526)
SA State: active
transform: esp-aes-256 esp-sha-hmac no compression
in use settings ={L2L, Tunnel, NAT-T-Encaps, PFS Group 5, IKEv1, }
slot: 0, conn_id: 266432512, crypto-map: TELCOCryptoMap
sa timing: remaining key lifetime (kB/sec): (4374000/3438)
IV size: 16 bytes
replay detection support: Y
Anti replay bitmap:
0x00000000 0x00000001
outbound esp sas:
spi: 0x3F59926A (1062834794)
SA State: active
transform: esp-aes-256 esp-sha-hmac no compression
in use settings ={L2L, Tunnel, NAT-T-Encaps, PFS Group 5, IKEv1, }
slot: 0, conn_id: 266432512, crypto-map: TELCOCryptoMap
sa timing: remaining key lifetime (kB/sec): (4374000/3438)
IV size: 16 bytes
replay detection support: Y
Anti replay bitmap:
0x00000000 0x00000001
Crypto map tag: TELCOCryptoMap, seq num: 690, local addr: I.J.K.L
access-list CRYPTO-NETXCELL-VPN extended permit ip host Q.R.S.T host E.F.G.H
local ident (addr/mask/prot/port): (Q.R.S.T/255.255.255.255/0/0)
remote ident (addr/mask/prot/port): (E.F.G.H/255.255.255.255/0/0)
current_peer: A.B.C.D
#pkts encaps: 0, #pkts encrypt: 0, #pkts digest: 0
#pkts decaps: 0, #pkts decrypt: 0, #pkts verify: 0
#pkts compressed: 0, #pkts decompressed: 0
#pkts not compressed: 0, #pkts comp failed: 0, #pkts decomp failed: 0
#pre-frag successes: 0, #pre-frag failures: 0, #fragments created: 0
#PMTUs sent: 0, #PMTUs rcvd: 0, #decapsulated frgs needing reassembly: 0
#TFC rcvd: 0, #TFC sent: 0
#Valid ICMP Errors rcvd: 0, #Invalid ICMP Errors rcvd: 0
#send errors: 0, #recv errors: 0
local crypto endpt.: I.J.K.L/4500, remote crypto endpt.: A.B.C.D/4500
path mtu 1500, ipsec overhead 82(52), media mtu 1500
PMTU time remaining (sec): 0, DF policy: copy-df
ICMP error validation: disabled, TFC packets: disabled
current outbound spi: 01DCEC29
current inbound spi : D9735EB5
inbound esp sas:
spi: 0xD9735EB5 (3648216757)
SA State: active
transform: esp-aes-256 esp-sha-hmac no compression
in use settings ={L2L, Tunnel, NAT-T-Encaps, PFS Group 5, IKEv1, }
slot: 0, conn_id: 266432512, crypto-map: TELCOCryptoMap
sa timing: remaining key lifetime (kB/sec): (4374000/3438)
IV size: 16 bytes
replay detection support: Y
Anti replay bitmap:
0x00000000 0x00000001
outbound esp sas:
spi: 0x01DCEC29 (31255593)
SA State: active
transform: esp-aes-256 esp-sha-hmac no compression
in use settings ={L2L, Tunnel, NAT-T-Encaps, PFS Group 5, IKEv1, }
slot: 0, conn_id: 266432512, crypto-map: TELCOCryptoMap
sa timing: remaining key lifetime (kB/sec): (4374000/3438)
IV size: 16 bytes
replay detection support: Y
Anti replay bitmap:
0x00000000 0x00000001
Com isso, o dispositivo cisco parece não ter nenhum pacote esp recebido.
Qualquer ponteiros, como eu acredito que pode estar em algum lugar no nível aws .. obrigado
aqui é o tcpdump
[toor@ip-E-F-G-H ~]# tcpdump esp
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
^C
0 packets captured
0 packets received by filter
0 packets dropped by kernel
[toor@ip-E-F-G-H ~]# tcpdump port 4500
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
13:39:28.382551 IP ip-E-F-G-H.us-east-2.compute.internal.ipsec-nat-t > I.J.K.L.ipsec-nat-t: isakmp-nat-keep-alive
13:39:28.382575 IP ip-E-F-G-H.us-east-2.compute.internal.ipsec-nat-t > I.J.K.L.ipsec-nat-t: isakmp-nat-keep-alive
13:39:28.382580 IP ip-E-F-G-H.us-east-2.compute.internal.ipsec-nat-t > I.J.K.L.ipsec-nat-t: isakmp-nat-keep-alive
13:39:29.222092 IP I.J.K.L.ipsec-nat-t > ip-E-F-G-H.us-east-2.compute.internal.ipsec-nat-t: NONESP-encap: isakmp: phase 2/others ? inf[E]
13:39:29.222277 IP ip-E-F-G-H.us-east-2.compute.internal.ipsec-nat-t > I.J.K.L.ipsec-nat-t: NONESP-encap: isakmp: phase 2/others ? inf[E]
^C
5 packets captured
5 packets received by filter
0 packets dropped by kernel
[toor@ip-E-F-G-H ~]# tcpdump port 500
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
^C
0 packets captured
0 packets received by filter
0 packets dropped by kernel
aqui ip xfrm state
[toor@ip-E-F-G-H ~]# ip xfrm state
src I.J.K.L dst E.F.G.H
proto esp spi 0xe603c44c reqid 16389 mode tunnel
replay-window 32 flag af-unspec
auth-trunc hmac(sha1) 0x53c09c699e580292be07d7159ec6b7bee6767310 96
enc cbc(aes) 0x1e6fdc95ab9e02d1cbb690f89cca6528ff73e65696528b9615a5b09cd310cd2a
encap type espinudp sport 4500 dport 4500 addr 0.0.0.0
anti-replay context: seq 0x0, oseq 0x0, bitmap 0x00000000
src E.F.G.H dst I.J.K.L
proto esp spi 0x386e8731 reqid 16389 mode tunnel
replay-window 32 flag af-unspec
auth-trunc hmac(sha1) 0xec8ed07c653732ffba1d9b63929ac6211005dbee 96
enc cbc(aes) 0xe046bd204feb33e44b24bf1c1476a7425c8ef3318ab705feb2761ae471823d5a
encap type espinudp sport 4500 dport 4500 addr 0.0.0.0
anti-replay context: seq 0x0, oseq 0x3, bitmap 0x00000000
src I.J.K.L dst E.F.G.H
proto esp spi 0x17676d9a reqid 16393 mode tunnel
replay-window 32 flag af-unspec
auth-trunc hmac(sha1) 0x79ab780421c9e079c122006499f9d034ba4ef961 96
enc cbc(aes) 0xde3c9b22338e09c885d9dae4bc93c99fc650a41aa3a7cc8a6ac07affe72f5bd3
encap type espinudp sport 4500 dport 4500 addr 0.0.0.0
anti-replay context: seq 0x0, oseq 0x0, bitmap 0x00000000
src E.F.G.H dst I.J.K.L
proto esp spi 0x3cfbd571 reqid 16393 mode tunnel
replay-window 32 flag af-unspec
auth-trunc hmac(sha1) 0x4163513e0f66ac3656dd18569be72b51b60a3b9e 96
enc cbc(aes) 0xf4c5b790d4d509daef59c7ab50b6620230113c7d21eeaaff48e5a589733636ea
encap type espinudp sport 4500 dport 4500 addr 0.0.0.0
anti-replay context: seq 0x0, oseq 0x5, bitmap 0x00000000
aqui está a política ip xfrm
[toor@ip-E-F-G-H ~]# ip xfrm policy
src E.F.0.0/20 dst M.N.O.P/32
dir out priority 2464 ptype main
tmpl src E.F.G.H dst I.J.K.L
proto esp reqid 16389 mode tunnel
src M.N.O.P/32 dst E.F.0.0/20
dir fwd priority 2464 ptype main
tmpl src I.J.K.L dst E.F.G.H
proto esp reqid 16389 mode tunnel
--- omitted output -- but u get the gist --