[strongSwan] Charon crashes after trying to initiate 990+ IKE SAs

[Liam Schönberg]

Hi,

I'm encountering the situation where Charon crashes after trying to initiate 990+ IKE SAs. What we're trying to do here is a stress test against our VPN server.

> Nov 17 21:54:24 ip-100-84-217-47 ipsec[2175]: 13[IKE] IKE_SA CONN00988[988] established between 100.84.217.47[INIT00988]...1.2.3.4[1.2.3.4]
> Nov 17 21:54:24 ip-100-84-217-47 charon: 13[ENC] generating AGGRESSIVE request 0 [ HASH NAT-D NAT-D ]
> Nov 17 21:54:24 ip-100-84-217-47 charon: 13[NET] sending packet: from 100.84.217.47[10988] to 1.2.3.4[4500] (108 bytes)
> Nov 17 21:54:24 ip-100-84-217-47 charon: 13[ENC] generating QUICK_MODE request 4075658581 [ HASH SA No KE ID ID ]
> Nov 17 21:54:24 ip-100-84-217-47 charon: 13[NET] sending packet: from 100.84.217.47[10988] to 1.2.3.4[4500] (316 bytes)
> Nov 17 21:54:24 ip-100-84-217-47 charon: 05[IKE] initiating Aggressive Mode IKE_SA CONN00997[997] to 1.2.3.4
> Nov 17 21:54:24 ip-100-84-217-47 charon: 05[ENC] generating AGGRESSIVE request 0 [ SA KE No ID V V V V V ]
> Nov 17 21:54:24 ip-100-84-217-47 charon: 05[NET] sending packet: from 100.84.217.47[10997] to 1.2.3.4[4500] (367 bytes)
> Nov 17 21:54:24 ip-100-84-217-47 charon: 06[CFG] received stroke: add connection 'CONN00998'
> Nov 17 21:54:24 ip-100-84-217-47 charon: 06[CFG] added configuration 'CONN00998'
> Nov 17 21:54:24 ip-100-84-217-47 ipsec[2175]: 13[IK*** buffer overflow detected ***: /usr/lib/ipsec/charon terminated
> Nov 17 21:54:24 ip-100-84-217-47 charon: 10[CFG] received stroke: initiate '10_akei00998'
> Nov 17 21:54:24 ip-100-84-217-47 ipsec[2175]: reading stroke response failed
> Nov 17 21:54:24 ip-100-84-217-47 ipsec[2175]: connecting to 'unix:///var/run/charon.ctl' failed: Connection refused
> Nov 17 21:54:24 ip-100-84-217-47 ipsec[2175]: failed to connect to stroke socket 'unix:///var/run/charon.ctl'
> Nov 17 21:54:24 ip-100-84-217-47 ipsec[2175]: connecting to 'unix:///var/run/charon.ctl' failed: Connection refused
> Nov 17 21:54:24 ip-100-84-217-47 ipsec[2175]: failed to connect to stroke socket 'unix:///var/run/charon.ctl'
> Nov 17 21:54:24 ip-100-84-217-47 ipsec[2175]: connecting to 'unix:///var/run/charon.ctl' failed: Connection refused
> Nov 17 21:54:24 ip-100-84-217-47 ipsec[2175]: failed to connect to stroke socket 'unix:///var/run/charon.ctl'
> Nov 17 21:54:24 ip-100-84-217-47 ipsec[2175]: charon has died -- restart scheduled (5sec)
> Nov 17 21:54:25 ip-100-84-217-47 systemd[1]: Started Session 4 of user ubuntu.
> Nov 17 21:54:29 ip-100-84-217-47 charon: 00[DMN] Starting IKE charon daemon (strongSwan 5.6.2, Linux 5.4.0-1029-aws, x86_64)

Could anybody tell me what I should do differently, so that it can initiate up to 20,000 IKE SAs? Here's the config I'm using on the initiator side...

> config setup
> conn %default
>         right=1.2.3.4
>         ikelifetime=3600s
>         keylife=28800s
>         rekeymargin=3m
>         keyingtries=1
>         keyexchange=ikev1
>         leftauth=psk
>         rightauth=psk
>         ike=aes128-sha1-modp1024!
>         esp=aes128-sha1-modp1024!
>         authby=secret
>         aggressive=yes
>         rightsubnet=100.110.171.0/24
>         auto=add
> conn CONN00001
>         leftid=@INIT00001
>         leftsubnet=10.1.1.0/24
>         leftikeport=10001
>         rightikeport=4500

Any suggestions or comments would be greatly appreciated.

Best regards,

jellybeanshiba
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