[Swan] multinet with ikev2 not working

[Paul Wouters]

On Aug 23, 2022, at 05:05, Peter Viskup <peter.viskup at gmail.com> wrote:
> 
> 
> Just went trough the FortiGate cookbook which mention the requirement of different SPI's for both subnets for Cisco ASA.
> How to configure the libreswan to use different SPI for every subnet? Not able to find it in man pages.

Currently that is the only supported method.

Paul

> 
> https://docs.fortinet.com/document/fortigate/6.2.3/cookbook/666100/ipsec-vpn-between-a-fortigate-and-a-cisco-asa-with-multiple-subnets
> 
>> On Mon, Aug 22, 2022 at 6:40 PM Peter Viskup <peter.viskup at gmail.com> wrote:
>> Thank you for quick response.
>> The output I just sent was just after the tunnel sp2 was established with the same configuration, just with another rightsubnet.
>> # ipsec auto --up sp2
>> 002 "sp2" #92: initiating v2 parent SA
>> 133 "sp2" #92: STATE_PARENT_I1: initiate
>> 002 "sp2" #92: local IKE proposals for sp2 (IKE SA initiator selecting KE): 1:IKE:ENCR=AES_CBC_256;PRF=HMAC_SHA2_256;INTEG=HMAC_SHA2_256_128;DH=ECP_384
>> 133 "sp2" #92: STATE_PARENT_I1: sent v2I1, expected v2R1
>> 002 "sp2" #92: local ESP/AH proposals for sp2 (IKE SA initiator emitting ESP/AH proposals): 1:ESP:ENCR=AES_CBC_256;INTEG=HMAC_SHA2_256_128;DH=NONE;ESN=DISABLED
>> 134 "sp2" #93: STATE_PARENT_I2: sent v2I2, expected v2R2 {auth=IKEv2 cipher=aes_256 integ=sha256_128 prf=sha2_256 group=DH20}
>> 002 "sp2" #93: IKEv2 mode peer ID is ID_IPV4_ADDR: '1.2.3.4'
>> 003 "sp2" #93: Authenticated using authby=secret
>> 002 "sp2" #93: negotiated connection [100.64.7.0-100.64.7.255:0-65535 0] -> [10.20.20.0-10.20.20.255:0-65535 0]
>> 004 "sp2" #93: STATE_V2_IPSEC_I: IPsec SA established tunnel mode {ESP/NAT=>0x6d6a23ce <0x19a1226c xfrm=AES_CBC_256-HMAC_SHA2_256_128 NATOA=none NATD=1.2.3.4:4500 DPD=active}
>> 
>> And I am able to reach both ends of VPN tunnel.
>> 
>>> On Mon, Aug 22, 2022 at 6:20 PM Paul Wouters <paul at nohats.ca> wrote:
>>> On Mon, 22 Aug 2022, Peter Viskup wrote:
>>> 
>>> > [root at prd01a ipsec.d]# ipsec auto --up sp1
>>> > 002 "sp1" #94: local ESP/AH proposals for sp1 (ESP/AH initiator emitting proposals):
>>> > 1:ESP:ENCR=AES_CBC_256;INTEG=HMAC_SHA2_256_128;DH=ECP_384;ESN=DISABLED
>>> > 139 "sp1" #94: STATE_V2_CREATE_I: sent IPsec Child req wait response
>>> > 003 "sp1" #94: dropping unexpected CREATE_CHILD_SA message containing INVALID_KE_PAYLOAD notification; message payloads: SK; encrypted payloads: N;
>>> > missing payloads: SA,Ni,TSi,TSr
>>> 
>>> Looks like your other end does not like your PFS or DH group size?
>> It does - as I was able to initiate the first tunnel. Even this tunnel can be establised when tried as the first.
>>  
>>> 
>>> > Configuration is similar to this (rightsubnets):
>>> > conn sp1
>>> >         hostaddrfamily=ipv4
>>> >         clientaddrfamily=ipv4
>>> >         right=1.2.3.4
>>> >         rightsubnet=10.10.10.0/24
>>> >         #rightsubnets={10.10.10.0/24 10.20.20.0/24}
>>> >         left=100.64.7.8
>>> >         leftsubnet=100.64.7.0/24
>>> >         #ikev2
>>> >         leftauth=secret
>>> >         rightauth=secret
>>> >         ikev2=insist
>>> >         ike=aes256-sha256;dh20
>>> >         esp=aes256-sha256;dh20
>>> 
>>> Does the other end not like dh20?
>>> Does the other end not like pfs=yes? Try pfs=no to see what happens
>>> then?
>> Getting the same error with pfs=no and no dh20 in ike/esp.
>> 
>> 002 "sp1" #95: local ESP/AH proposals for sp1 (ESP/AH initiator emitting proposals): 1:ESP:ENCR=AES_CBC_256;INTEG=HMAC_SHA2_256_128;ESN=DISABLED
>> 139 "sp1" #95: STATE_V2_CREATE_I: sent IPsec Child req wait response
>> 003 "sp1" #95: dropping unexpected CREATE_CHILD_SA message containing INVALID_KE_PAYLOAD notification; message payloads: SK; encrypted payloads: N; missing payloads: SA,Ni,TSi,TSr
>>  
>> And this is just prove the sp1 is working either (after taking down sp2), both do not work at the same time.
>> 
>> # ipsec auto --up sp1
>> 002 "sp1" #101: initiating v2 parent SA
>> 133 "sp1" #101: STATE_PARENT_I1: initiate
>> 002 "sp1" #101: local IKE proposals for sp1 (IKE SA initiator selecting KE): 1:IKE:ENCR=AES_CBC_256;PRF=HMAC_SHA2_256;INTEG=HMAC_SHA2_256_128;DH=ECP_384
>> 133 "sp1" #101: STATE_PARENT_I1: sent v2I1, expected v2R1
>> 002 "sp1" #101: local ESP/AH proposals for sp1 (IKE SA initiator emitting ESP/AH proposals): 1:ESP:ENCR=AES_CBC_256;INTEG=HMAC_SHA2_256_128;DH=NONE;ESN=DISABLED
>> 134 "sp1" #102: STATE_PARENT_I2: sent v2I2, expected v2R2 {auth=IKEv2 cipher=aes_256 integ=sha256_128 prf=sha2_256 group=DH20}
>> 002 "sp1" #102: IKEv2 mode peer ID is ID_IPV4_ADDR: '1.2.3.4'
>> 003 "sp1" #102: Authenticated using authby=secret
>> 002 "sp1" #102: negotiated connection [100.64.7.0-100.64.7.255:0-65535 0] -> [10.10.10.0-10.10.10.255:0-65535 0]
>> 004 "sp1" #102: STATE_V2_IPSEC_I: IPsec SA established tunnel mode {ESP/NAT=>0x4f986552 <0x5990fe61 xfrm=AES_CBC_256-HMAC_SHA2_256_128 NATOA=none NATD=1.2.3.4:4500 DPD=active}
>> 
>> ...able to reach both ends of the established tunnel (ICMP and TCP too).
>> 
>>> 
>>> > The multinet testconfigurations have the "ikev2=no"
>>> > libreswan/east.conf at main · libreswan/libreswan · GitHub 
>>> 
>>> Likely just because it was an IKEv1 test and we kept it the same. There
>>> should be an equivalent ikev2 test, or we should add one :)
>>> 
>>> Paul
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