I am trying to setup an IPSec IKEv2 VPN Network on a pfSense. The pfsense is situated directly behind the modem. There is no double NAT. I followed this tutorial:
[netgate IKEv2 Tutorial][1]
The connection doesn't work. The log on the pfSense for an android trying to connect to the firewall:
Sep 6 07:59:03 charon 97494 07[NET] <1> received packet: from 109.42.113.240[49837] to xxx.xxx.xxx.xxx[500] (650 bytes)
Sep 6 07:59:03 charon 97494 07[ENC] <1> parsed IKE_SA_INIT request 0 [ SA KE No N(NATD_S_IP) N(NATD_D_IP) N(HASH_ALG) N(REDIR_SUP) ]
Sep 6 07:59:03 charon 97494 07[CFG] <1> looking for an IKEv2 config for xxx.xxx.xxx.xxx...109.42.113.240
Sep 6 07:59:03 charon 97494 07[CFG] <1> candidate: xxx.xxx.xxx.xxx...0.0.0.0/0, ::/0, prio 1052
Sep 6 07:59:03 charon 97494 07[CFG] <1> found matching ike config: xxx.xxx.xxx.xxx...0.0.0.0/0, ::/0 with prio 1052
Sep 6 07:59:03 charon 97494 07[IKE] <1> 109.42.113.240 is initiating an IKE_SA
Sep 6 07:59:03 charon 97494 07[IKE] <1> IKE_SA (unnamed)[1] state change: CREATED => CONNECTING
Sep 6 07:59:03 charon 97494 07[CFG] <1> selecting proposal:
Sep 6 07:59:03 charon 97494 07[CFG] <1> proposal matches
Sep 6 07:59:03 charon 97494 07[CFG] <1> received proposals: IKE:AES_CBC_256/AES_CBC_128/HMAC_SHA2_512_256/HMAC_SHA2_384_192/HMAC_SHA2_256_128/HMAC_SHA1_96/PRF_HMAC_SHA2_512/PRF_HMAC_SHA2_384/PRF_HMAC_SHA2_256/PRF_HMAC_SHA1/MODP_2048_256/ECP_384/ECP_256/MODP_2048/MODP_1536, IKE:AES_GCM_16_256/AES_GCM_16_128/PRF_HMAC_SHA2_512/PRF_HMAC_SHA2_384/PRF_HMAC_SHA2_256/PRF_HMAC_SHA1/MODP_2048_256/ECP_384/ECP_256/MODP_2048/MODP_1536
Sep 6 07:59:03 charon 97494 07[CFG] <1> configured proposals: IKE:AES_CBC_256/HMAC_SHA2_256_128/PRF_HMAC_SHA2_256/MODP_2048
Sep 6 07:59:03 charon 97494 07[CFG] <1> selected proposal: IKE:AES_CBC_256/HMAC_SHA2_256_128/PRF_HMAC_SHA2_256/MODP_2048
Sep 6 07:59:03 charon 97494 07[CFG] <1> received supported signature hash algorithms: sha256 sha384 sha512
Sep 6 07:59:03 charon 97494 07[IKE] <1> remote host is behind NAT
Sep 6 07:59:03 charon 97494 07[IKE] <1> DH group MODP_2048_256 unacceptable, requesting MODP_2048
Sep 6 07:59:03 charon 97494 07[ENC] <1> generating IKE_SA_INIT response 0 [ N(INVAL_KE) ]
Sep 6 07:59:03 charon 97494 07[NET] <1> sending packet: from xxx.xxx.xxx.xxx[500] to 109.42.113.240[49837] (38 bytes)
Sep 6 07:59:03 charon 97494 07[IKE] <1> IKE_SA (unnamed)[1] state change: CONNECTING => DESTROYING
Sep 6 07:59:03 charon 97494 07[NET] <2> received packet: from 109.42.113.240[49837] to xxx.xxx.xxx.xxx[500] (650 bytes)
Sep 6 07:59:03 charon 97494 07[ENC] <2> parsed IKE_SA_INIT request 0 [ SA KE No N(NATD_S_IP) N(NATD_D_IP) N(HASH_ALG) N(REDIR_SUP) ]
Sep 6 07:59:03 charon 97494 07[CFG] <2> looking for an IKEv2 config for xxx.xxx.xxx.xxx...109.42.113.240
Sep 6 07:59:03 charon 97494 07[CFG] <2> candidate: xxx.xxx.xxx.xxx...0.0.0.0/0, ::/0, prio 1052
Sep 6 07:59:03 charon 97494 07[CFG] <2> found matching ike config: xxx.xxx.xxx.xxx...0.0.0.0/0, ::/0 with prio 1052
Sep 6 07:59:03 charon 97494 07[IKE] <2> 109.42.113.240 is initiating an IKE_SA
Sep 6 07:59:03 charon 97494 07[IKE] <2> IKE_SA (unnamed)[2] state change: CREATED => CONNECTING
Sep 6 07:59:03 charon 97494 07[CFG] <2> selecting proposal:
Sep 6 07:59:03 charon 97494 07[CFG] <2> proposal matches
Sep 6 07:59:03 charon 97494 07[CFG] <2> received proposals: IKE:AES_CBC_256/AES_CBC_128/HMAC_SHA2_512_256/HMAC_SHA2_384_192/HMAC_SHA2_256_128/HMAC_SHA1_96/PRF_HMAC_SHA2_512/PRF_HMAC_SHA2_384/PRF_HMAC_SHA2_256/PRF_HMAC_SHA1/MODP_2048/MODP_2048_256/ECP_384/ECP_256/MODP_1536, IKE:AES_GCM_16_256/AES_GCM_16_128/PRF_HMAC_SHA2_512/PRF_HMAC_SHA2_384/PRF_HMAC_SHA2_256/PRF_HMAC_SHA1/MODP_2048/MODP_2048_256/ECP_384/ECP_256/MODP_1536
Sep 6 07:59:03 charon 97494 07[CFG] <2> configured proposals: IKE:AES_CBC_256/HMAC_SHA2_256_128/PRF_HMAC_SHA2_256/MODP_2048
Sep 6 07:59:03 charon 97494 07[CFG] <2> selected proposal: IKE:AES_CBC_256/HMAC_SHA2_256_128/PRF_HMAC_SHA2_256/MODP_2048
Sep 6 07:59:03 charon 97494 07[CFG] <2> received supported signature hash algorithms: sha256 sha384 sha512
Sep 6 07:59:03 charon 97494 07[IKE] <2> remote host is behind NAT
Sep 6 07:59:03 charon 97494 07[CFG] <2> sending supported signature hash algorithms: sha256 sha384 sha512 identity
Sep 6 07:59:03 charon 97494 07[IKE] <2> sending cert request for "CN=CApfSense, C=DE, ST=SH, L=Kiel"
Sep 6 07:59:03 charon 97494 07[ENC] <2> generating IKE_SA_INIT response 0 [ SA KE No N(NATD_S_IP) N(NATD_D_IP) CERTREQ N(HASH_ALG) N(CHDLESS_SUP) N(MULT_AUTH) ]
Sep 6 07:59:03 charon 97494 07[NET] <2> sending packet: from xxx.xxx.xxx.xxx[500] to 109.42.113.240[49837] (489 bytes)
Sep 6 07:59:03 charon 97494 07[NET] <2> received packet: from 109.42.113.240[58932] to xxx.xxx.xxx.xxx[4500] (352 bytes)
Sep 6 07:59:03 charon 97494 07[ENC] <2> parsed IKE_AUTH request 1 [ IDi CPRQ(ADDR DNS) SA TSi TSr N(MOBIKE_SUP) N(ADD_6_ADDR) N(ADD_6_ADDR) N(MULT_AUTH) N(EAP_ONLY) N(MSG_ID_SYN_SUP) ]
Sep 6 07:59:03 charon 97494 07[CFG] <2> looking for peer configs matching xxx.xxx.xxx.xxx[%any]...109.42.113.240[mobile]
Sep 6 07:59:03 charon 97494 07[CFG] <2> candidate "con-mobile", match: 1/1/1052 (me/other/ike)
Sep 6 07:59:03 charon 97494 07[CFG] <con-mobile|2> selected peer config 'con-mobile'
Sep 6 07:59:03 charon 97494 07[IKE] <con-mobile|2> initiating EAP_IDENTITY method (id 0x00)
Sep 6 07:59:03 charon 97494 07[IKE] <con-mobile|2> processing INTERNAL_IP4_ADDRESS attribute
Sep 6 07:59:03 charon 97494 07[IKE] <con-mobile|2> processing INTERNAL_IP4_DNS attribute
Sep 6 07:59:03 charon 97494 07[IKE] <con-mobile|2> peer supports MOBIKE
Sep 6 07:59:03 charon 97494 07[IKE] <con-mobile|2> got additional MOBIKE peer address: 2a00:20:7001:d583:88d0:45b0:8275:ddf7
Sep 6 07:59:03 charon 97494 07[IKE] <con-mobile|2> got additional MOBIKE peer address: 2a00:20:70ce:7c05:b6b3:d5fb:adc5:c902
Sep 6 07:59:03 charon 97494 07[IKE] <con-mobile|2> authentication of 'xxx.xxx.xxx.xxx' (myself) with RSA_EMSA_PKCS1_SHA2_256 successful
Sep 6 07:59:03 charon 97494 07[IKE] <con-mobile|2> sending end entity cert "CN=pfSense, C=DE, ST=SH, L=Kiel"
Sep 6 07:59:03 charon 97494 07[ENC] <con-mobile|2> generating IKE_AUTH response 1 [ IDr CERT AUTH EAP/REQ/ID ]
Sep 6 07:59:03 charon 97494 07[NET] <con-mobile|2> sending packet: from xxx.xxx.xxx.xxx[4500] to 109.42.113.240[58932] (1472 bytes)
Sep 6 07:59:03 charon 97494 07[NET] <con-mobile|2> received packet: from 109.42.113.240[58932] to xxx.xxx.xxx.xxx[4500] (80 bytes)
Sep 6 07:59:03 charon 97494 07[ENC] <con-mobile|2> parsed INFORMATIONAL request 2 [ N(AUTH_FAILED) ]
Sep 6 07:59:03 charon 97494 07[ENC] <con-mobile|2> generating INFORMATIONAL response 2 [ N(AUTH_FAILED) ]
Sep 6 07:59:03 charon 97494 07[NET] <con-mobile|2> sending packet: from xxx.xxx.xxx.xxx[4500] to 109.42.113.240[58932] (80 bytes)
Sep 6 07:59:03 charon 97494 07[IKE] <con-mobile|2> IKE_SA con-mobile[2] state change: CONNECTING => DESTROYING
The issue seems to be in these lines:
Sep 6 07:59:03 charon 97494 07[ENC] <con-mobile|2> parsed INFORMATIONAL request 2 [ N(AUTH_FAILED) ]
Sep 6 07:59:03 charon 97494 07[ENC] <con-mobile|2> generating INFORMATIONAL response 2 [ N(AUTH_FAILED) ]
What does it mean and where should I look for setup mistakes? Apparently it is an authentification issue. Is there something wrong with the certificates? What else could be the reason? (The certificates are installed on my phone as well of course)
[1]: https://docs.netgate.com/pfsense/en/latest/recipes/ipsec-mobile-ikev2-eap-mschapv2.html