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Feature #377

kernel-libipsec: support more algorithms

Added by Luka Perkov almost 7 years ago. Updated almost 7 years ago.

Status:
Closed
Priority:
Normal
Assignee:
Tobias Brunner
Category:
libipsec
Target version:
5.1.1
Start date:
09.08.2013
Due date:
Estimated time:
Resolution:
Fixed

Description

I'm trying to use strongswan with kernel-libipsec on linux (3.9.4) but unfortunately it's not working. Here is the relevant part of "ipsec restart --nofork" output:

05[IKE] authentication of 'XxXxX' with RSA successful
05[IKE] IKE_SA XxXxX[1] established between FOO...BAR
05[IKE] scheduling reauthentication in 10002s
05[IKE] maximum IKE_SA lifetime 10542s
05[ENC] generating QUICK_MODE request 3912695104 [ HASH SA No KE ID ID ]
05[NET] sending packet: from A.B.C.D[4500] to X.W.Y.Z[4500] (308 bytes)
02[NET] received packet: from X.W.Y.Z[4500] to A.B.C.D[4500] (324 bytes)
02[ENC] parsed QUICK_MODE response 3912695104 [ HASH SA No KE ID ID N((24576)) ]
02[ESP] failed to create ESP context: unsupported encryption algorithm
02[ESP] failed to create SAD entry
02[ESP] failed to create ESP context: unsupported encryption algorithm
02[ESP] failed to create SAD entry
02[IKE] unable to install inbound and outbound IPsec SA (SAD) in kernel
02[ENC] generating QUICK_MODE request 1737399506 [ HASH SA No KE ID ID ]
02[NET] sending packet: from A.B.C.D[4500] to X.W.Y.Z[4500] (308 bytes)
15[NET] received packet: from X.W.Y.Z[4500] to A.B.C.D[4500] (324 bytes)
15[ENC] parsed QUICK_MODE response 1737399506 [ HASH SA No KE ID ID N((24576)) ]
15[ESP] failed to create ESP context: unsupported encryption algorithm
15[ESP] failed to create SAD entry
15[ESP] failed to create ESP context: unsupported encryption algorithm
15[ESP] failed to create SAD entry
15[IKE] unable to install inbound and outbound IPsec SA (SAD) in kernel
15[ENC] generating QUICK_MODE request 2932897482 [ HASH SA No KE ID ID ]
15[NET] sending packet: from A.B.C.D[4500] to X.W.Y.Z[4500] (308 bytes)
16[NET] received packet: from X.W.Y.Z[4500] to A.B.C.D[4500] (324 bytes)
16[ENC] parsed QUICK_MODE response 2932897482 [ HASH SA No KE ID ID N((24576)) ]
16[ESP] failed to create ESP context: unsupported encryption algorithm
16[ESP] failed to create SAD entry
16[ESP] failed to create ESP context: unsupported encryption algorithm
16[ESP] failed to create SAD entry
16[IKE] unable to install inbound and outbound IPsec SA (SAD) in kernel
16[ENC] generating QUICK_MODE request 502652095 [ HASH SA No KE ID ID ]
16[NET] sending packet: from A.B.C.D[4500] to X.W.Y.Z[4500] (308 bytes)
06[NET] received packet: from X.W.Y.Z[4500] to A.B.C.D[4500] (324 bytes)
06[ENC] parsed QUICK_MODE response 502652095 [ HASH SA No KE ID ID N((24576)) ]
06[ESP] failed to create ESP context: unsupported encryption algorithm
06[ESP] failed to create SAD entry
06[ESP] failed to create ESP context: unsupported encryption algorithm
06[ESP] failed to create SAD entry
06[IKE] unable to install inbound and outbound IPsec SA (SAD) in kernel
06[ENC] generating INFORMATIONAL_V1 request 3861531521 [ HASH N(NO_PROP) ]
06[NET] sending packet: from A.B.C.D[4500] to X.W.Y.Z[4500] (76 bytes)
06[ENC] generating INFORMATIONAL_V1 request 3956559828 [ HASH N(NO_PROP) ]
06[NET] sending packet: from A.B.C.D[4500] to X.W.Y.Z[4500] (76 bytes)
06[ENC] generating INFORMATIONAL_V1 request 3218326822 [ HASH N(NO_PROP) ]
06[NET] sending packet: from A.B.C.D[4500] to X.W.Y.Z[4500] (76 bytes)
06[ENC] generating INFORMATIONAL_V1 request 4192011303 [ HASH N(NO_PROP) ]
06[NET] sending packet: from A.B.C.D[4500] to X.W.Y.Z[4500] (76 bytes)
04[IKE] sending DPD request
04[ENC] generating INFORMATIONAL_V1 request 2476302813 [ HASH N(DPD) ]
04[NET] sending packet: from A.B.C.D[4500] to X.W.Y.Z[4500] (92 bytes)
03[NET] received packet: from X.W.Y.Z[4500] to A.B.C.D[4500] (92 bytes)
03[ENC] parsed INFORMATIONAL_V1 request 3412858184 [ HASH N(DPD_ACK) ]
01[NET] received packet: from X.W.Y.Z[4500] to A.B.C.D[4500] (324 bytes)
01[ENC] invalid HASH_V1 payload length, decryption failed?
01[ENC] could not decrypt payloads
01[IKE] message parsing failed
01[ENC] generating INFORMATIONAL_V1 request 3450131845 [ HASH N(PLD_MAL) ]
01[NET] sending packet: from A.B.C.D[4500] to X.W.Y.Z[4500] (68 bytes)
01[IKE] QUICK_MODE request with message ID 3912695104 processing failed
05[NET] received packet: from X.W.Y.Z[4500] to A.B.C.D[4500] (324 bytes)
05[ENC] invalid HASH_V1 payload length, decryption failed?
05[ENC] could not decrypt payloads
05[IKE] message parsing failed
05[ENC] generating INFORMATIONAL_V1 request 2950229696 [ HASH N(PLD_MAL) ]
05[NET] sending packet: from A.B.C.D[4500] to X.W.Y.Z[4500] (68 bytes)
05[IKE] QUICK_MODE request with message ID 1737399506 processing failed
02[NET] received packet: from X.W.Y.Z[4500] to A.B.C.D[4500] (324 bytes)
02[IKE] received retransmit of response with ID 2932897482, but next request already sent
15[IKE] sending DPD request
15[ENC] generating INFORMATIONAL_V1 request 1923278649 [ HASH N(DPD) ]
15[NET] sending packet: from A.B.C.D[4500] to X.W.Y.Z[4500] (92 bytes)
16[NET] received packet: from X.W.Y.Z[4500] to A.B.C.D[4500] (84 bytes)
16[ENC] parsed INFORMATIONAL_V1 request 3429950406 [ HASH D ]
16[IKE] received DELETE for IKE_SA XxXxX[1]

When ipsec is running I see that ipsec0 interface is created:

ipsec0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST>  mtu 1400
        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 500  (UNSPEC)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

I have tested and strongswan is working just fine when used with kernel-netlink and same configuration.

Do you have any pointers or am I missing something obvious?

Thanks,
Luka

Associated revisions

Revision 3f29ff82 (diff)
Added by Tobias Brunner almost 7 years ago

libipsec: Don't limit traditional algorithms to AES and SHA1/2

Closes #377.

History

#1 Updated by Tobias Brunner almost 7 years ago

  • Tracker changed from Issue to Feature
  • Subject changed from kernel-libipsec to kernel-libipsec support more algorithms
  • Description updated (diff)
  • Category set to configuration
  • Status changed from New to Assigned
  • Assignee set to Tobias Brunner
02[ESP] failed to create ESP context: unsupported encryption algorithm
02[ESP] failed to create SAD entry

libipsec currently supports the AES and AES-GCM algorithms only. I suppose 3DES is negotiated here (as it is IKEv1).

There is not really a reason to not support other algorithms too, I guess, but there was simply no need for them so far (and it might even encouraging people to use newer algorithms). Anyway, I'll have a look at it next week.

#2 Updated by Luka Perkov almost 7 years ago

Yes, I'm using IKEv1 with 3DES not by choice ;)

This is relavant part from my ipsec.conf file:

esp=3des-sha1-modp1024
 ike=3des-sha1-modp1024
 keyexchange=ikev1

Thanks for explanation. I can help by testing patches if you need that.

#3 Updated by Tobias Brunner almost 7 years ago

  • Subject changed from kernel-libipsec support more algorithms to kernel-libipsec: support more algorithms
  • Category changed from configuration to libipsec
  • Status changed from Assigned to Closed
  • Target version set to 5.1.1
  • Resolution set to Fixed

The associated commit removes the algorithm limitation in libipsec.

#4 Updated by Luka Perkov almost 7 years ago

Hi Tobias,

I have tested your change and now it works just fine. I have one more question and I would really appreciate if you could make some clarifications.

When ipsec is established I see this new interface:

ipsec0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1400
unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 500 (UNSPEC)
RX packets 3 bytes 252 (252.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 3 bytes 252 (252.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

I need to manually add my left ip address on eth0 interface before I start ipsec:

ip addr add A.B.C.D/32 dev eth0

I'm dealing with IKEv1 and need to put in place some complex routing rules. Having TUN interface seemed like the easiest approach. I'm wondering if assigning left ip address to ipsec0 interface could be somehow handled automatically? Is that even possible or it does not work that way?

Thanks again.

Luka

#5 Updated by Tobias Brunner almost 7 years ago

I'm not sure what you are trying to do exactly. What do you mean with left? Is that the address you use to communicate with the VPN gateway (i.e. the only address on eth0) or some kind of virtual IP address used inside the tunnel. If the latter, you should check out the config options used to assign virtual IP addresses.

I'm dealing with IKEv1 and need to put in place some complex routing rules.

What complex routing rules?

#6 Updated by Luka Perkov almost 7 years ago

Tobias Brunner wrote:

If the latter, you should check out the config options used to assign virtual IP addresses.

Yes, that is it. But unfortunately if I put anything in leftsourceip the tunnel is not created.

I'm dealing with IKEv1 and need to put in place some complex routing rules.

What complex routing rules?

For example I need to send through the tunnel all trafic to 1.1.1.1/24 except trafic for addresses 1.1.1.51, 1.1.1.99 and 1.1.1.101. I order for that to work I "manually" configure ip xfrm, routes and iptables. Is there a better way to do it?

#7 Updated by Tobias Brunner almost 7 years ago

If the latter, you should check out the config options used to assign virtual IP addresses.

Yes, that is it. But unfortunately if I put anything in leftsourceip the tunnel is not created.

You have to configure matching statements for rightsourceip on the other VPN endpoint.

I'm dealing with IKEv1 and need to put in place some complex routing rules.

What complex routing rules?

For example I need to send through the tunnel all trafic to 1.1.1.1/24 except trafic for addresses 1.1.1.51, 1.1.1.99 and 1.1.1.101. I order for that to work I "manually" configure ip xfrm, routes and iptables. Is there a better way to do it?

Do you want to send traffic to these hosts unencrypted or not at all?

If you use the kernel-netlink plugin you can install passthrough or drop policies (which you can also install manually with ip xfrm).

Something like:

conn except
    leftsubnet=<local IP>/32
    rightsubnet=1.1.1.51/32,1.1.1.99/32,1.1.1.101/32
    type=passthrough (or drop)
    auto=route

This is not yet supported by the kernel-libipsec plugin.

#8 Updated by Luka Perkov almost 7 years ago

Tobias Brunner wrote:

If the latter, you should check out the config options used to assign virtual IP addresses.

Yes, that is it. But unfortunately if I put anything in leftsourceip the tunnel is not created.

You have to configure matching statements for rightsourceip on the other VPN endpoint.

On the other end is not strongswan. I'll double check if I can do anything.

I'm dealing with IKEv1 and need to put in place some complex routing rules.

What complex routing rules?

For example I need to send through the tunnel all trafic to 1.1.1.1/24 except trafic for addresses 1.1.1.51, 1.1.1.99 and 1.1.1.101. I order for that to work I "manually" configure ip xfrm, routes and iptables. Is there a better way to do it?

Do you want to send traffic to these hosts unencrypted or not at all?

If you use the kernel-netlink plugin you can install passthrough or drop policies (which you can also install manually with ip xfrm).

Something like:
[...]

This is not yet supported by the kernel-libipsec plugin.

I have too many of them. It's really easier to have all the ip xfrm rules in script. Thanks anyway.

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