Bug #446: received netlink error: Invalid argument (22) with TFC and IPComp - strongSwan

Bug #446

received netlink error: Invalid argument (22) with TFC and IPComp

Added by Noel Kuntze over 6 years ago. Updated over 6 years ago.

Status:

Closed

Priority:

Normal

Assignee:

Tobias Brunner

Category:

kernel

Target version:

5.1.2

Start date:

15.11.2013

Due date:

Estimated time:

Affected version:

5.1.1

Resolution:

Fixed

Description

When I try to connect to my strongSwan responder from the network segment of my FH (Fachhochschule), the responder sends the initiatro a NO_PROP_CHOSEN
error and shows this in the log:
31[KNL] received netlink error: Invalid argument (22)
31[KNL] unable to add SAD entry with SPI 00003f21
31[KNL] received netlink error: Invalid argument (22)
31[KNL] unable to add SAD entry with SPI c4807934
31[IKE] unable to install outbound IPsec SA (SAD) in kernel
31[IKE] failed to establish CHILD_SA, keeping IKE_SA

The same connection works, when I try to initiate it from the same LAN the responder is in.
If I remember correctly, it worked just fine with strongSwan 5.1.0.

ipsec.conf (3.95 KB) ipsec.conf	ipsec.conf	Noel Kuntze, 15.11.2013 19:22
charon_compact.log (59 KB) charon_compact.log	shortened log	Noel Kuntze, 15.11.2013 19:22
config.gz (35.2 KB) config.gz	kernel config	Noel Kuntze, 19.11.2013 00:23
ipsec.conf (642 Bytes) ipsec.conf	responder ipsec.conf	Noel Kuntze, 19.11.2013 00:23
initiator ipsec.conf (627 Bytes) initiator ipsec.conf	initiator ipsec.conf	Noel Kuntze, 19.11.2013 00:23

Associated revisions

Revision 38a4f196 (diff)
Added by Tobias Brunner over 6 years ago

kernel-netlink: Enable TFC padding only for tunnel mode ESP SAs

The kernel does not allow them for transport mode SAs or IPComp SAs (and
of course not for AH SAs).

Fixes #446.

History

#1 Updated by Noel Kuntze over 6 years ago

It might be, that the kernel doesn't like, that the source IP address is inside the netsegment, that is covered by the already established "fh" connection.
But as this worked before, I think this might be a code regression.

#2 Updated by Noel Kuntze over 6 years ago

I now also get this error when I initiate from inside my LAN.
I also tried to use esp=camellia256-sha256-ecp521 and added that proposal on the server side, but the error persisted.

29[CFG] received proposals: ESP:CAMELLIA_CBC_256/HMAC_SHA2_256_128/NO_EXT_SEQ
29[CFG] configured proposals: ESP:AES_GCM_16_256/ECP_521/NO_EXT_SEQ, ESP:CAMELLIA_CBC_256/HMAC_SHA2_256_128/ECP_521/NO_EXT_SEQ, ESP:AES_CBC_128/AES_CBC_192/AES_CBC_256/3DES_CBC/BLOWFISH_CBC_
256/HMAC_SHA1_96/AES_XCBC_96/HMAC_MD5_96/NO_EXT_SEQ
29[CFG] selected proposal: ESP:CAMELLIA_CBC_256/HMAC_SHA2_256_128/NO_EXT_SEQ
29[CFG] selecting traffic selectors for us:
29[CFG] config: 192.168.178.48/32, received: 192.168.178.48/32 => match: 192.168.178.48/32
29[CFG] selecting traffic selectors for other:
29[CFG] config: 172.16.19.1/32, received: 0.0.0.0/0 => match: 172.16.19.1/32
29[CHD] using CAMELLIA_CBC for encryption
29[CHD] using HMAC_SHA2_256_128 for integrity
29[CHD] adding inbound ESP SA
29[CHD] SPI 0xc791bb52, src 192.168.178.84 dst 192.168.178.48
29[CHD] adding outbound ESP SA
29[CHD] SPI 0xcf55c152, src 192.168.178.48 dst 192.168.178.84
29[KNL] received netlink error: Invalid argument (22)
29[KNL] unable to add SAD entry with SPI 00008bb0
29[KNL] received netlink error: Invalid argument (22)
29[KNL] unable to add SAD entry with SPI cf55c152
29[IKE] unable to install outbound IPsec SA (SAD) in kernel
29[IKE] failed to establish CHILD_SA, keeping IKE_SA

#3 Updated by Noel Kuntze over 6 years ago

The error was caused by "compress=yes". The kernel obviously didn't like this, although the modules are loaded.

responder: lsmod | grep comp
ipcomp 2004 0
xfrm_ipcomp 4028 1 ipcomp
xfrm_algo 4904 7 ah4,ah6,esp4,esp6,af_key,xfrm_user,xfrm_ipcomp

initiator: lsmod | grep comp
ipcomp 2004 0
xfrm_ipcomp 4028 1 ipcomp
xfrm_algo 4904 5 ah4,esp4,af_key,xfrm_user,xfrm_ipcomp

#4 Updated by Tobias Brunner over 6 years ago

Status changed from New to Feedback
Assignee set to Tobias Brunner

Hm, strange. In particular because it worked for the inbound SA but not the outbound SA:

29[CHD] adding inbound ESP SA
29[CHD] SPI 0xc791bb52, src 192.168.178.84 dst 192.168.178.48
29[CHD] adding outbound ESP SA
29[CHD] SPI 0xcf55c152, src 192.168.178.48 dst 192.168.178.84
29[KNL] received netlink error: Invalid argument (22)
29[KNL] unable to add SAD entry with SPI 00008bb0
29[KNL] received netlink error: Invalid argument (22)
29[KNL] unable to add SAD entry with SPI cf55c152

Also, it fails for the IPComp SA (00008bb0) and the ESP SA (cf55c152).

So if you just set compress=no it works between the exact same hosts that the config failed before? No other changes (e.g. other tunnels) involved?
Could you post the configs for a simple test case (same LAN)? And your kernel config?

#5 Updated by Yves-Alexis Perez over 6 years ago

I seem to have the same kind of issue but it seems more related to GCM than to compress. Not sure if this is exactly related (sorry if hijacking the issue), but I have the same netlink errors.

Can you retry with esp=aes256-sha256-modp2048 or something like that?

Nov 18 15:46:54 scapa charon: 06[CFG] received stroke: initiate 'molly4'
Nov 18 15:46:54 scapa charon: 11[IKE] establishing CHILD_SA molly4
Nov 18 15:46:54 scapa charon: 11[KNL] getting SPI for reqid {5}
Nov 18 15:46:54 scapa charon: 11[KNL] sending XFRM_MSG_ALLOCSPI: => 248 bytes @ 0x7f17aaf837e0
Nov 18 15:46:54 scapa charon: 11[KNL]    0: F8 00 00 00 16 00 01 00 E0 00 00 00 4D 02 00 00  ............M...
Nov 18 15:46:54 scapa charon: 11[KNL]   16: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 11[KNL]   32: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 11[KNL]   48: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 11[KNL]   64: 00 00 00 00 00 00 00 00 C0 A8 1C 38 00 00 00 00  ...........8....
Nov 18 15:46:54 scapa charon: 11[KNL]   80: 00 00 00 00 00 00 00 00 00 00 00 00 32 00 00 00  ............2...
Nov 18 15:46:54 scapa charon: 11[KNL]   96: 4E C0 44 2E 00 00 00 00 00 00 00 00 00 00 00 00  N.D.............
Nov 18 15:46:54 scapa charon: 11[KNL]  112: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 11[KNL]  128: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 11[KNL]  144: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 11[KNL]  160: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 11[KNL]  176: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 11[KNL]  192: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 11[KNL]  208: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 11[KNL]  224: 05 00 00 00 02 00 01 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 11[KNL]  240: 00 00 00 C0 FF FF FF CF                          ........
Nov 18 15:46:54 scapa charon: 11[KNL] got SPI cea86ed8 for reqid {5}
Nov 18 15:46:54 scapa charon: 11[ENC] generating CREATE_CHILD_SA request 5 [ SA No KE TSi TSr ]
Nov 18 15:46:54 scapa charon: 11[NET] sending packet: from 192.168.XXX.XXX[4500] to XXX.XXX.XXX.XXX[4500] (597 bytes)
Nov 18 15:46:54 scapa charon: 14[NET] received packet: from XXX.XXX.XXX.XXX[4500] to 192.168.XXX.XXX[4500] (449 bytes)
Nov 18 15:46:54 scapa charon: 14[ENC] parsed CREATE_CHILD_SA response 5 [ SA No KE TSi TSr ]
Nov 18 15:46:54 scapa charon: 14[CHD]   using AES_GCM_16 for encryption
Nov 18 15:46:54 scapa charon: 14[CHD] adding inbound ESP SA
Nov 18 15:46:54 scapa charon: 14[CHD]   SPI 0xcea86ed8, src XXX.XXX.XXX.XXX dst 192.168.XXX.XXX
Nov 18 15:46:54 scapa charon: 14[KNL] adding SAD entry with SPI cea86ed8 and reqid {5}  (mark 0/0x00000000)
Nov 18 15:46:54 scapa charon: 14[KNL]   using encryption algorithm AES_GCM_16 with key size 288
Nov 18 15:46:54 scapa charon: 14[KNL]   using replay window of 32 packets
Nov 18 15:46:54 scapa charon: 14[KNL] sending XFRM_MSG_UPDSA: => 380 bytes @ 0x7f17a9780580
Nov 18 15:46:54 scapa charon: 14[KNL]    0: 7C 01 00 00 1A 00 05 00 E1 00 00 00 4D 02 00 00  |...........M...
Nov 18 15:46:54 scapa charon: 14[KNL]   16: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 14[KNL]   32: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 14[KNL]   48: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 14[KNL]   64: 00 00 00 00 00 00 00 00 C0 A8 1C 38 00 00 00 00  ...........8....
Nov 18 15:46:54 scapa charon: 14[KNL]   80: 00 00 00 00 00 00 00 00 CE A8 6E D8 32 00 00 00  ..........n.2...
Nov 18 15:46:54 scapa charon: 14[KNL]   96: 4E C0 44 2E 00 00 00 00 00 00 00 00 00 00 00 00  N.D.............
Nov 18 15:46:54 scapa charon: 14[KNL]  112: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ................
Nov 18 15:46:54 scapa charon: 14[KNL]  128: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ................
Nov 18 15:46:54 scapa charon: 14[KNL]  144: D3 03 00 00 00 00 00 00 B0 04 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 14[KNL]  160: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 14[KNL]  176: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 14[KNL]  192: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 14[KNL]  208: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 14[KNL]  224: 05 00 00 00 02 00 01 20 20 00 00 00 00 00 00 00  .......  .......
Nov 18 15:46:54 scapa charon: 14[KNL]  240: 70 00 12 00 72 66 63 34 31 30 36 28 67 63 6D 28  p...rfc4106(gcm(
Nov 18 15:46:54 scapa charon: 14[KNL]  256: 61 65 73 29 29 00 00 00 00 00 00 00 00 00 00 00  aes))...........
Nov 18 15:46:54 scapa charon: 14[KNL]  272: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 14[KNL]  288: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 14[KNL]  304: 00 00 00 00 20 01 00 00 80 00 00 00 53 95 DC D6  .... .......S...
Nov 18 15:46:54 scapa charon: 14[KNL]  320: 9C 8B 65 81 FD 40 20 24 48 CE 0C D3 1D 4A F5 15  ..e..@ $H....J..
Nov 18 15:46:54 scapa charon: 14[KNL]  336: 80 A3 9D C7 FB 48 45 E2 7A FF 0A 80 A9 C1 DB AE  .....HE.z.......
Nov 18 15:46:54 scapa charon: 14[KNL]  352: 1C 00 04 00 02 00 11 94 11 94 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 14[KNL]  368: 00 00 00 00 00 00 00 00 00 00 00 00              ............
Nov 18 15:46:54 scapa charon: 14[KNL] received netlink error: Invalid argument (22)
Nov 18 15:46:54 scapa charon: 14[KNL] unable to add SAD entry with SPI cea86ed8
Nov 18 15:46:54 scapa charon: 14[CHD] adding outbound ESP SA
Nov 18 15:46:54 scapa charon: 14[CHD]   SPI 0xc4121f55, src 192.168.XXX.XXX dst XXX.XXX.XXX.XXX
Nov 18 15:46:54 scapa charon: 14[KNL] adding SAD entry with SPI c4121f55 and reqid {5}  (mark 0/0x00000000)
Nov 18 15:46:54 scapa charon: 14[KNL]   using encryption algorithm AES_GCM_16 with key size 288
Nov 18 15:46:54 scapa charon: 14[KNL]   using replay window of 32 packets
Nov 18 15:46:54 scapa charon: 14[KNL] sending XFRM_MSG_NEWSA: => 380 bytes @ 0x7f17a9780580
Nov 18 15:46:54 scapa charon: 14[KNL]    0: 7C 01 00 00 10 00 05 00 E2 00 00 00 4D 02 00 00  |...........M...
Nov 18 15:46:54 scapa charon: 14[KNL]   16: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 14[KNL]   32: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 14[KNL]   48: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 14[KNL]   64: 00 00 00 00 00 00 00 00 4E C0 44 2E 00 00 00 00  ........N.D.....
Nov 18 15:46:54 scapa charon: 14[KNL]   80: 00 00 00 00 00 00 00 00 C4 12 1F 55 32 00 00 00  ...........U2...
Nov 18 15:46:54 scapa charon: 14[KNL]   96: C0 A8 1C 38 00 00 00 00 00 00 00 00 00 00 00 00  ...8............
Nov 18 15:46:54 scapa charon: 14[KNL]  112: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ................
Nov 18 15:46:54 scapa charon: 14[KNL]  128: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ................
Nov 18 15:46:54 scapa charon: 14[KNL]  144: 6E 03 00 00 00 00 00 00 B0 04 00 00 00 00 00 00  n...............
Nov 18 15:46:54 scapa charon: 14[KNL]  160: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 14[KNL]  176: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 14[KNL]  192: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 14[KNL]  208: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 14[KNL]  224: 05 00 00 00 02 00 01 20 20 00 00 00 00 00 00 00  .......  .......
Nov 18 15:46:54 scapa charon: 14[KNL]  240: 70 00 12 00 72 66 63 34 31 30 36 28 67 63 6D 28  p...rfc4106(gcm(
Nov 18 15:46:54 scapa charon: 14[KNL]  256: 61 65 73 29 29 00 00 00 00 00 00 00 00 00 00 00  aes))...........
Nov 18 15:46:54 scapa charon: 14[KNL]  272: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 14[KNL]  288: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 14[KNL]  304: 00 00 00 00 20 01 00 00 80 00 00 00 E5 95 BB FA  .... ...........
Nov 18 15:46:54 scapa charon: 14[KNL]  320: B3 8C 74 33 AB 26 52 85 39 AF BC E4 D6 41 A7 1F  ..t3.&R.9....A..
Nov 18 15:46:54 scapa charon: 14[KNL]  336: B7 DF 32 B4 98 4B 6B E2 06 C7 44 26 D9 8A 93 E8  ..2..Kk...D&....
Nov 18 15:46:54 scapa charon: 14[KNL]  352: 1C 00 04 00 02 00 11 94 11 94 00 00 00 00 00 00  ................
Nov 18 15:46:54 scapa charon: 14[KNL]  368: 00 00 00 00 00 00 00 00 00 00 00 00              ............
Nov 18 15:46:54 scapa charon: 14[KNL] received netlink error: Invalid argument (22)
Nov 18 15:46:54 scapa charon: 14[KNL] unable to add SAD entry with SPI c4121f55
Nov 18 15:46:54 scapa charon: 14[IKE] unable to install inbound and outbound IPsec SA (SAD) in kernel
Nov 18 15:46:54 scapa charon: 14[IKE] failed to establish CHILD_SA, keeping IKE_SA
Nov 18 15:46:54 scapa charon: 14[IKE] sending DELETE for ESP CHILD_SA with SPI cea86ed8
Nov 18 15:46:54 scapa charon: 14[ENC] generating INFORMATIONAL request 6 [ D ]
Nov 18 15:46:54 scapa charon: 14[NET] sending packet: from 192.168.XXX.XXX[4500] to XXX.XXX.XXX.XXX[4500] (69 bytes)
Nov 18 15:46:55 scapa charon: 04[NET] received packet: from XXX.XXX.XXX.XXX[4500] to 192.168.XXX.XXX[4500] (69 bytes)
Nov 18 15:46:55 scapa charon: 04[ENC] parsed INFORMATIONAL response 6 [ D ]
Nov 18 15:46:55 scapa charon: 04[KNL] deleting SAD entry with SPI cea86ed8  (mark 0/0x00000000)
Nov 18 15:46:55 scapa charon: 04[KNL] sending XFRM_MSG_DELSA: => 40 bytes @ 0x7f17ae78a7c0
Nov 18 15:46:55 scapa charon: 04[KNL]    0: 28 00 00 00 11 00 05 00 E3 00 00 00 4D 02 00 00  (...........M...
Nov 18 15:46:55 scapa charon: 04[KNL]   16: C0 A8 1C 38 00 00 00 00 00 00 00 00 00 00 00 00  ...8............
Nov 18 15:46:55 scapa charon: 04[KNL]   32: CE A8 6E D8 02 00 32 00                          ..n...2.
Nov 18 15:46:55 scapa charon: 04[KNL] deleted SAD entry with SPI cea86ed8 (mark 0/0x00000000)
Nov 18 15:46:55 scapa charon: 04[KNL] deleting SAD entry with SPI c4121f55  (mark 0/0x00000000)
Nov 18 15:46:55 scapa charon: 04[KNL] sending XFRM_MSG_DELSA: => 40 bytes @ 0x7f17ae78a7c0
Nov 18 15:46:55 scapa charon: 04[KNL]    0: 28 00 00 00 11 00 05 00 E4 00 00 00 4D 02 00 00  (...........M...
Nov 18 15:46:55 scapa charon: 04[KNL]   16: 4E C0 44 2E 00 00 00 00 00 00 00 00 00 00 00 00  N.D.............
Nov 18 15:46:55 scapa charon: 04[KNL]   32: C4 12 1F 55 02 00 32 00                          ...U..2.

(this is on the peer upping the tunnel, running Debian sid with 3.11-1-amd64 kernel).

When looking at /proc/crypto I can see:

name         : rfc4106(gcm(aes))
driver       : rfc4106-gcm-aesni
module       : aesni_intel
priority     : 400
refcnt       : 1
selftest     : passed
type         : nivaead
async        : yes
blocksize    : 1
ivsize       : 8
maxauthsize  : 16
geniv        : seqiv

so I guess it /should/ be ok, but the kernel still refuses it.

#6 Updated by Tobias Brunner over 6 years ago

@Yves-Alexis: I think your issue has already been reported, see #341. In short, it is caused by the aesni_intel module not supporting key lengths > 128 bit. So either use aes128gcm* or disable said module.

#7 Updated by Yves-Alexis Perez over 6 years ago

Tobias Brunner wrote:

@Yves-Alexis: I think your issue has already been reported, see #341. In short, it is caused by the aesni_intel module not supporting key lengths > 128 bit. So either use aes128gcm* or disable said module.

Indeed, using aes128gcm16 works, will reply there.

#8 Updated by Noel Kuntze over 6 years ago

File config.gz config.gz added
File ipsec.conf ipsec.conf added
File initiator ipsec.conf initiator ipsec.conf added

Yes, deactivating compression makes the tunnels work and activating it causes the tunnel to fail.
Exactly, no other changes. Just change the "compress" parameter.
responder and initiator ipsec.confs, as well as the kernel config are attached to the comment.

Change "compress" to "yes" in the initiator config to make it fail.

#9 Updated by Tobias Brunner over 6 years ago

Tracker changed from Issue to Bug
Subject changed from received netlink error: Invalid argument (22) to received netlink error: Invalid argument (22) with TFC and IPComp
Category set to kernel
Status changed from Feedback to Closed
Target version set to 5.1.2
Resolution set to Fixed

Thanks for the config, I was able to reproduce the issue. The problem is the tfc=%mtu option. The kernel apparently only supports traffic flow confidentiality padding for tunnel mode ESP SAs (with IPComp the ESP SA is installed in transport mode). Since TFC is only enabled on the outbound SA, installing the inbound SA worked.

The associated patch fixes this by only configuring TFC padding for tunnel mode ESP SAs. Without it you'll have to disable either the tfc or the compress option.

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