[strongSwan] Certificate-based IPsec tunnel failing to complete
Regel, Julian (CSS)
Julian.Regel at capita.co.uk
Thu Jul 4 14:16:40 CEST 2019
Hi
I am trying to configure an IPsec tunnel between a Cisco ASA and StrongSWAN, using IKEv2 and certificates for authentication.
I'm running StrongSWAN version 5.6.2-1ubuntu2.4, installed on Ubuntu 18.04.2 LTS.
I am using a self-signed certificate on the ASA end. Unfortunately, I'm getting the following error (full error log below, and I've obviously sanitised the FQDN and DN):
[CFG] constraint check failed: identity 'vpntest.$MY_ORG.co.uk' required
Based on the StrongSWAN FAQ, I assumed this was the SAN field in the certificate that was wrong, but on checking, it appears okay(?).
Please can you advise what I need to check to help fix this?
Many thanks
Julian
########## ASA certificate
$ openssl x509 -in asa.crt -text -noout
Certificate:
Data:
Version: 3 (0x2)
Serial Number: 2 (0x2)
Signature Algorithm: ecdsa-with-SHA256
Issuer: C = UK, ST = $MY_STATE, L = $MY_CITY, O = $MY_ORG, OU = $MY_OU, CN = CA Root (ECDSA)
Validity
Not Before: Jul 4 10:43:17 2019 GMT
Not After : Jul 3 10:43:17 2020 GMT
Subject: C = UK, ST = $MY_STATE, O = $MY_ORG, OU = $MY_OU, CN = vpntest.$MY_ORG.co.uk
Subject Public Key Info:
Public Key Algorithm: id-ecPublicKey
Public-Key: (256 bit)
pub:
04:0b:73:8e:6e:7f:41:99:18:3b:70:27:3c:97:4e:
c2:84:8a:19:fa:37:fd:51:eb:cd:64:a1:27:ac:68:
36:30:c5:64:eb:75:85:99:e3:ff:3e:d5:2f:f8:6b:
4c:b0:ee:45:00:59:dd:06:06:b5:5e:d5:d8:b1:8f:
a6:10:33:a5:e6
ASN1 OID: prime256v1
NIST CURVE: P-256
X509v3 extensions:
X509v3 Subject Alternative Name:
DNS:vpntest.$MY_ORG.co.uk
Signature Algorithm: ecdsa-with-SHA256
30:46:02:21:00:c3:0b:fc:15:e9:f2:19:86:8d:51:3c:12:0c:
f7:4f:22:12:07:a7:1f:ff:73:b3:52:3a:ac:c8:6b:ee:e8:5c:
36:02:21:00:ed:51:ca:79:8a:13:d0:45:80:ee:bf:18:4f:59:
54:94:72:41:c0:88:52:56:d1:9f:c5:17:8d:c0:88:7d:20:3d
########## /etc/swanctl.conf:
connections {
onprem-to-azure {
local_addrs = 172.26.0.85
remote_addrs = ON_PREM_EXT_IP
local {
auth = pubkey
certs = occert.pem
id = vpn.production.$MY_ORG.cloud
}
remote {
auth = pubkey
id = vpntest.MY_ORG.co.uk
}
children {
net1-net1 {
local_ts = 172.26.0.85
remote_ts = 10.1.0.0/16
#updown = /usr/local/libexec/ipsec/_updown iptables
rekey_time = 5400
rekey_bytes = 500000000
rekey_packets = 1000000
esp_proposals = aes128gcm16-ecp256 # Phase 2
}
}
version = 2
mobike = yes
reauth_time = 10800
proposals = aes128gcm16-prfsha256-ecp256 # Phase 1
}
}
########### Trying to bring the tunnel up:
root at s00C-vpn-uks-01:/etc/swanctl/x509ca# swanctl -i -c net1-net1
[IKE] initiating IKE_SA onprem-to-azure[1] to $MY_ON_PREM_EXT_IP
[ENC] generating IKE_SA_INIT request 0 [ SA KE No N(NATD_S_IP) N(NATD_D_IP) N(FRAG_SUP) N(HASH_ALG) N(REDIR_SUP) ]
[NET] sending packet: from 172.26.0.85[500] to $MY_ON_PREM_EXT_IP[500] (264 bytes)
[NET] received packet: from $MY_ON_PREM_EXT_IP[500] to 172.26.0.85[500] (659 bytes)
[ENC] parsed IKE_SA_INIT response 0 [ SA KE No V V N(NATD_S_IP) N(NATD_D_IP) CERTREQ N(FRAG_SUP) V ]
[IKE] received Cisco Delete Reason vendor ID
[IKE] received Cisco Copyright (c) 2009 vendor ID
[IKE] received FRAGMENTATION vendor ID
[IKE] local host is behind NAT, sending keep alives
[IKE] received cert request for "C=UK, ST=$MY_STATE, L=$MY_CITY, O=$MY_ORG, OU=$MY_OU, CN=CA Root (ECDSA)"
[IKE] received cert request for "C=UK, ST=$MY_STATE, L=$MY_CITY, O=$MY_ORG, OU=$MY_OU, CN=CA Root (ECDSA)"
[IKE] received cert request for "C=BM, O=QuoVadis Limited, CN=QuoVadis Global SSL ICA G3"
[IKE] received cert request for "C=BM, O=QuoVadis Limited, CN=QuoVadis Root CA 2 G3"
[IKE] received 10 cert requests for an unknown ca
[IKE] sending cert request for "C=BM, O=QuoVadis Limited, CN=QuoVadis Root CA 2 G3"
[IKE] sending cert request for "C=UK, ST=$MY_STATE, L=$MY_CITY, O=$MY_ORG, OU=$MY_OU, CN=CA Root (ECDSA)"
[IKE] sending cert request for "C=BM, O=QuoVadis Limited, CN=QuoVadis Global SSL ICA G3"
[IKE] authentication of 'vpn.production.$MY_ORG.cloud' (myself) with ECDSA-256 signature successful
[IKE] sending end entity cert "C=GB, ST=London, L=London, O=$MY_ORG PLC, CN=vpn.production.$MY_ORG.cloud"
[IKE] establishing CHILD_SA net1-net1{1}
[ENC] generating IKE_AUTH request 1 [ IDi CERT N(INIT_CONTACT) CERTREQ IDr AUTH SA TSi TSr N(MOBIKE_SUP) N(NO_ADD_ADDR) N(EAP_ONLY) N(MSG_ID_SYN_SUP) ]
[ENC] splitting IKE message with length of 2018 bytes into 2 fragments
[ENC] generating IKE_AUTH request 1 [ EF(1/2) ]
[ENC] generating IKE_AUTH request 1 [ EF(2/2) ]
[NET] sending packet: from 172.26.0.85[4500] to $MY_ON_PREM_EXT_IP[4500] (1248 bytes)
[NET] sending packet: from 172.26.0.85[4500] to $MY_ON_PREM_EXT_IP[4500] (835 bytes)
[NET] received packet: from $MY_ON_PREM_EXT_IP[4500] to 172.26.0.85[4500] (525 bytes)
[ENC] parsed IKE_AUTH response 1 [ EF(1/4) ]
[ENC] received fragment #1 of 4, waiting for complete IKE message
[NET] received packet: from $MY_ON_PREM_EXT_IP[4500] to 172.26.0.85[4500] (525 bytes)
[ENC] parsed IKE_AUTH response 1 [ EF(3/4) ]
[ENC] received fragment #3 of 4, waiting for complete IKE message
[NET] received packet: from $MY_ON_PREM_EXT_IP[4500] to 172.26.0.85[4500] (525 bytes)
[ENC] parsed IKE_AUTH response 1 [ EF(2/4) ]
[ENC] received fragment #2 of 4, waiting for complete IKE message
[NET] received packet: from $MY_ON_PREM_EXT_IP[4500] to 172.26.0.85[4500] (76 bytes)
[ENC] parsed IKE_AUTH response 1 [ EF(4/4) ]
[ENC] received fragment #4 of 4, reassembling fragmented IKE message
[ENC] parsed IKE_AUTH response 1 [ V IDr CERT CERT AUTH SA TSi TSr N(ESP_TFC_PAD_N) N(NON_FIRST_FRAG) N(MOBIKE_SUP) ]
[IKE] received end entity cert "C=UK, ST=$MY_STATE, O=$MY_ORG, OU=$MY_OU, CN=vpntest.$MY_ORG.co.uk"
[IKE] received issuer cert "C=UK, ST=$MY_STATE, L=$MY_CITY, O=$MY_ORG, OU=$MY_OU, CN=CA Root (ECDSA)"
[CFG] using certificate "C=UK, ST=$MY_STATE, O=$MY_ORG, OU=$MY_OU, CN=vpntest.$MY_ORG.co.uk"
[CFG] using trusted ca certificate "C=UK, ST=$MY_STATE, L=$MY_CITY, O=$MY_ORG, OU=$MY_OU, CN=CA Root (ECDSA)"
[CFG] checking certificate status of "C=UK, ST=$MY_STATE, O=$MY_ORG, OU=MY_OU, CN=vpntest.$MY_ORG.co.uk"
[CFG] certificate status is not available
[CFG] reached self-signed root ca with a path length of 0
[IKE] authentication of 'C=UK, ST=$MY_STATE, O=$MY_ORG, OU=MY_OU, CN=vpntest.$MY_ORG.co.uk' with ECDSA-256 signature successful
[CFG] constraint check failed: identity 'vpntest.$MY_ORG.co.uk' required
[CFG] selected peer config 'onprem-to-azure' inacceptable: constraint checking failed
[CFG] no alternative config found
[ENC] generating INFORMATIONAL request 2 [ N(AUTH_FAILED) ]
[NET] sending packet: from 172.26.0.85[4500] to $MY_ON_PREM_EXT_IP[4500] (65 bytes)
initiate failed: establishing CHILD_SA 'net1-net1' failed
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