[strongSwan] Unable to use Certificate Path Chain (SUBCAs)

[Mohammed Rashid]

*Hi All,

I am using strongswan 5.0.2. I am using the following configuration with
host-host transport mode.
It was working fine when I was using the certificates directly from
RootCA. But when I generated certificates from SUBCA, ipsec starts
giving errors which I mentioned below..
*
*Mar  9 15:22:13 charon: 15[CFG] received stroke: initiate 'user4'
Mar  9 15:22:13 charon: 10[IKE] initiating IKE_SA user4[5] to 192.168.20.126
Mar  9 15:22:13 charon: 10[ENC] generating IKE_SA_INIT request 0 [ SA
KE No N(NATD_S_IP) N(NATD_D_IP) ]
Mar  9 15:22:13 charon: 10[NET] sending packet: from
192.168.20.112[500] to 192.168.20.126[500] (692 bytes)
Mar  9 15:22:13 charon: 09[NET] received packet: from
192.168.20.126[500] to 192.168.20.112[500] (432 bytes)
Mar  9 15:22:13 charon: 09[ENC] parsed IKE_SA_INIT response 0 [ SA KE
No N(NATD_S_IP) N(NATD_D_IP) ]
Mar  9 15:22:13 charon: 09[IKE] authentication of 'user5' (myself)
with RSA signature successful
Mar  9 15:22:13 charon: 09[IKE] establishing CHILD_SA user4
Mar  9 15:22:13 charon: 09[ENC] generating IKE_AUTH request 1 [ IDi
N(INIT_CONTACT) IDr AUTH N(USE_TRANSP) SA TSi TSr N(EAP_ONLY) ]
Mar  9 15:22:13 charon: 09[NET] sending packet: from
192.168.20.112[500] to 192.168.20.126[500] (684 bytes)
Mar  9 15:22:13 charon: 07[NET] received packet: from
192.168.20.126[500] to 192.168.20.112[500] (76 bytes)
Mar  9 15:22:13 charon: 07[ENC] parsed IKE_AUTH response 1 [ N(AUTH_FAILED) ]
Mar  9 15:22:13 charon: 07[IKE] received AUTHENTICATION_FAILED notify error


Mar  9 17:28:43 charon: 15[NET] received packet: from
192.168.20.112[500] to 192.168.20.126[500] (692 bytes)
Mar  9 17:28:43 charon: 15[ENC] parsed IKE_SA_INIT request 0 [ SA KE
No N(NATD_S_IP) N(NATD_D_IP) ]
Mar  9 17:28:43 charon: 15[IKE] 192.168.20.112 is initiating an IKE_SA
Mar  9 17:28:43 charon: 15[IKE] sending cert request for "CN=...."
Mar  9 17:28:43 charon: 15[ENC] generating IKE_SA_INIT response 0 [ SA
KE No N(NATD_S_IP) N(NATD_D_IP) CERTREQ ]
Mar  9 17:28:43 charon: 15[NET] sending packet: from
192.168.20.126[500] to 192.168.20.112[500] (457 bytes)
Mar  9 17:28:43 charon: 09[NET] received packet: from
192.168.20.112[500] to 192.168.20.126[500] (1548 bytes)
Mar  9 17:28:43 charon: 09[ENC] parsed IKE_AUTH request 1 [ IDi CERT
N(INIT_CONTACT) CERTREQ IDr AUTH N(USE_TRANSP) SA TSi TSr N(EAP_ONLY)
]
Mar  9 17:28:43 charon: 09[IKE] received cert request for "CN...."
Mar  9 17:28:43 charon: 09[IKE] received end entity cert "CN=user5..."
Mar  9 17:28:43 charon: 09[CFG] looking for peer configs matching
192.168.20.126[user4]...192.168.20.112[user5]
Mar  9 17:28:43 charon: 09[CFG] selected peer config 'user5'
Mar  9 17:28:43 charon: 09[CFG]   using certificate "CN=user5..."
Mar  9 17:28:43 charon: 09[CFG] no issuer certificate found for "CN=user5...."
Mar  9 17:28:43 charon: 09[IKE] no trusted RSA public key found for 'user5'
Mar  9 17:28:43 charon: 09[ENC] generating IKE_AUTH response 1 [
N(AUTH_FAILED) ]
Mar  9 17:28:43 charon: 09[NET] sending packet: from
192.168.20.126[500] to 192.168.20.112[500] (76 bytes)*

Regards,
Rashid
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