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Subject: [Bug 201447] aes-gcm corrupted packet
Date: Thu, 09 Jul 2015 23:49:38 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201447

            Bug ID: 201447
           Summary: aes-gcm corrupted packet
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: olivier@cochard.me
                CC: gnn@FreeBSD.org

With a simple static ipsec setup, packet are corrupted (during encryption or
decryption):

[root@ENCryptor]~# cat /etc/setkey.conf
flush;
spdflush;
spdadd 1.0.0.0/8 3.0.0.0/8 any -P out ipsec esp/tunnel/2.2.2.2-2.2.2.3/require;
spdadd 3.0.0.0/8 1.0.0.0/8 any -P in ipsec esp/tunnel/2.2.2.3-2.2.2.2/require;
add 2.2.2.2 2.2.2.3 esp 0x1000 -E aes-gcm-16
0x3ffe05014819ffff3ffe05014819ffff;
add 2.2.2.3 2.2.2.2 esp 0x1001 -E aes-gcm-16
0x3ffe05014819ffff3ffe05014819ffff;


[root@DECryptor]~# cat /etc/setkey.conf
flush;
spdflush;
spdadd 1.0.0.0/8 3.0.0.0/8 any -P in ipsec esp/tunnel/2.2.2.2-2.2.2.3/require;
spdadd 3.0.0.0/8 1.0.0.0/8 any -P out ipsec esp/tunnel/2.2.2.3-2.2.2.2/require;
add 2.2.2.2 2.2.2.3 esp 0x1000 -E aes-gcm-16
0x3ffe05014819ffff3ffe05014819ffff;
add 2.2.2.3 2.2.2.2 esp 0x1001 -E aes-gcm-16
0x3ffe05014819ffff3ffe05014819ffff;


packet generated, but result on DECryptor side:

[root@DECryptor]~# netstat -ssp esp
esp:
        3527445 packets dropped; bad encryption detected
        3581287 packets in
        1933894980 bytes in
        ESP output histogram:
                aes-gcm-16: 3581287


Pcap file available here:

http://dev.bsdrp.net/r285336-aes-gcm-16.pcap

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