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Date:      Fri, 25 Oct 2013 11:20:11 +0200
From:      =?ISO-8859-1?Q?Olivier_Cochard=2DLabb=E9?= <olivier@cochard.me>
To:        "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>
Subject:   Can't configure a simple IPSec (manual SA/SP)
Message-ID:  <CA%2Bq%2BTcqJwNXPOEWeh_FcnLu5KE7cyU7e1h2Q4dc==8D441nRWA@mail.gmail.com>
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Hi all,

I'm trying to configure simple static IPSec SA/SP in tunnel mode on my
FreeBSD 9.2-RELEASE (crypto + ipsec added to the kernel) but the IPSec
configuration seems to be ignored.

local private net (em0): 10.0.12.0/24
local end-point IP (em1): 10.0.23.2
remote private net: 10.0.45.0/24
remote end-point IP: 10.0.34.4

I'm configuring the static SA/SP entries like that:

flush;
spdflush;
spdadd 10.0.12.0/24 10.0.45.0/24 any -P out ipsec
esp/tunnel/10.0.23.2-10.0.34.4/require;
spdadd 10.0.45.0/24 10.0.12.0/24 any -P in ipsec
esp/tunnel/10.0.34.4-10.0.23.2/require;
add 10.0.23.2 10.0.34.4 esp 0x1000 -E 3des-cbc "3des_compliant_password1";
add 10.0.34.4 10.0.23.2 esp 0x1001 -E 3des-cbc "3des_compliant_password2";

This configuration seems correctly applied:

[root@R2]~# setkey -D
10.0.34.4 10.0.23.2
        esp mode=any spi=4097(0x00001001) reqid=0(0x00000000)
        E: 3des-cbc  33646573 5f636f6d 706c6961 6e745f70 61737377 6f726432
        seq=0x00000000 replay=0 flags=0x00000040 state=mature
        created: Oct 25 10:33:11 2013   current: Oct 25 11:08:49 2013
        diff: 2138(s)   hard: 0(s)      soft: 0(s)
        last:                           hard: 0(s)      soft: 0(s)
        current: 0(bytes)       hard: 0(bytes)  soft: 0(bytes)
        allocated: 0    hard: 0 soft: 0
        sadb_seq=1 pid=2024 refcnt=1
10.0.23.2 10.0.34.4
        esp mode=any spi=4096(0x00001000) reqid=0(0x00000000)
        E: 3des-cbc  33646573 5f636f6d 706c6961 6e745f70 61737377 6f726431
        seq=0x00000000 replay=0 flags=0x00000040 state=mature
        created: Oct 25 10:33:11 2013   current: Oct 25 11:08:49 2013
        diff: 2138(s)   hard: 0(s)      soft: 0(s)
        last:                           hard: 0(s)      soft: 0(s)
        current: 0(bytes)       hard: 0(bytes)  soft: 0(bytes)
        allocated: 0    hard: 0 soft: 0
        sadb_seq=0 pid=2024 refcnt=1
[root@R2]~# setkey -DP
10.0.45.0/24[any] 10.0.12.0/24[any] any
        in ipsec
        esp/tunnel/10.0.34.4-10.0.23.2/require
        spid=2 seq=1 pid=2025
        refcnt=1
10.0.12.0/24[any] 10.0.45.0/24[any] any
        out ipsec
        esp/tunnel/10.0.23.2-10.0.34.4/require
        spid=1 seq=0 pid=2025
        refcnt=1

But when a machine in local_private_net try to ping a
remote_private_net, the traffic is not tunnel/encrypted:

[root@R2]~# tcpdump -pni em1
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on em1, link-type EN10MB (Ethernet), capture size 65535 bytes
10:35:21.284571 IP 10.0.12.1 > 10.0.45.5: ICMP echo request, id 48913,
seq 0, length 64
10:35:22.288836 IP 10.0.12.1 > 10.0.45.5: ICMP echo request, id 48913,
seq 1, length 64
10:35:23.298386 IP 10.0.12.1 > 10.0.45.5: ICMP echo request, id 48913,
seq 2, length 64

I've try to enable IPSEC_DEBUG on my kernel: I've got nothing in my log.

How can I get a more verbose IPsec log for spotting my problem ?

Thanks,

Olivier

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