Open Stack

I am a little lost here, I have seen conflicting claims about where the 
handshake ends.  Are *both* sides receiving the SSH2_MSG_KEXINIT ?  Can 
you take packet traces anywhere in between your two endpoints?

I have seen networks include security middleboxes that are a little 
incompetent --- when the SSH2_MSG_KEXINIT  message's size is above some 
threshold (somewhere between 1 and 1.5 KB) the middlebox aborts the 
connection, sending TCP RST to both client and server.

Regards,
Mike



From:   Salvatore Orlando <salv.orlando at gmail.com>
To:     aishwarya.adyanthaya at accenture.com
Cc:     openstack-operators at lists.openstack.org
Date:   08/03/2015 07:38 PM
Subject:        Re: [Openstack-operators] ssh inside instance



More details about your environment might be useful.
For instance, are you running neutron with the "reference implementation" 
- or some other plugin/driver?
Is the logical router where the floating IP is attached a distributed 
router?

Also, if you run tcpdump on the receiving instance, you should probably be 
able to see the SSH packet coming in. What source address does it have?
Finally - I'm not sure if you already stated this - are you able to ping 
the instance using its floating IP from another instance?

Salvatore


On 3 August 2015 at 11:08, <aishwarya.adyanthaya at accenture.com> wrote:
Yes, I did notice that it isn’t receiving from the line:
debug1: SSH2_MSG_KEXINIT received
 
I have an internal IP and an external IP (floating IP) attached to the 
instance. If I make use of the internal IP to ssh itself from the very 
same node I’m able to do it but External IP isn’t working. 
 
I am able to ssh to the same machine with the floating IP outside 
Openstack but internally it doesn’t seem to work. My goal here is to ssh 
within an instance using the floating IP.
 
Thank you, 
Aishwarya
 
 
From: Salvatore Orlando [mailto:salv.orlando at gmail.com] 
Sent: Friday, July 31, 2015 5:56 PM
To: Adyanthaya, Aishwarya
Cc: Neil.Jerram at metaswitch.com; openstack-operators at lists.openstack.org

Subject: Re: [Openstack-operators] ssh inside instance
 
Why are you focusing on authentication issues when it seems you have 
either a sshd config issue or a connectivity problem?
 
Indeed your ssh handshake is stopping quite early - see below:
 
debug1: Connecting to 192.168.1.250 [192.168.1.250] port 22.
debug1: Connection established.
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.6.1p1 Ubuntu-2ubuntu2
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.6
debug1: match: OpenSSH_5.6 pat OpenSSH_5* compat 0x0c000000
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-sha1 none
debug1: kex: client->server aes128-ctr hmac-sha1 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<7680<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Server host key: <MEH>
debug1: Host '192.168.1.250' is known and matches the RSA host key.
debug1: Found key in /home/salvatore/.ssh/known_hosts:21
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,keyboard-interactive
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /home/salvatore/.ssh/id_rsa
debug1: Authentications that can continue: publickey,keyboard-interactive
 
Your instance seem to not be receiving back SSH2_MSG_KEXINIT.
Note: this question is more suitable for ask.openstack.org than for this 
ML imho.
 
Salvatore
 
 
 
On 30 July 2015 at 10:14, <aishwarya.adyanthaya at accenture.com> wrote:
Hi Neil,
 
I did the same as you have suggested. I have created an instance A and 
generated a private_key, giving it 600 permission. Using the key I 
launched the instance B but when I ssh from the instance A after a while 
it reads:
 
Read from socket failed: Connection timed out
 
I even tried with ssh –v hostname to test on one the machine outside 
openstack and the instance.
 
root at new:/home/ubuntu# ssh -v new
OpenSSH_6.6.1, OpenSSL 1.0.1f 6 Jan 2014
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to new [10.x.x.x] port 22.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug1: identity file /root/.ssh/id_rsa type -1
debug1: identity file /root/.ssh/id_rsa-cert type -1
debug1: identity file /root/.ssh/id_dsa type -1
debug1: identity file /root/.ssh/id_dsa-cert type -1
debug1: identity file /root/.ssh/id_ecdsa type -1
debug1: identity file /root/.ssh/id_ecdsa-cert type -1
debug1: identity file /root/.ssh/id_ed25519 type -1
debug1: identity file /root/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.6.1p1 Ubuntu-2ubuntu2
debug1: Remote protocol version 2.0, remote software version 
OpenSSH_6.6.1p1 Ubuntu-2ubuntu2
debug1: match: OpenSSH_6.6.1p1 Ubuntu-2ubuntu2 pat OpenSSH_6.6.1* compat 
0x04000000
debug1: SSH2_MSG_KEXINIT sent
 
Read from socket failed: Connection timed out
 
So this is what I’m getting again.
 
Thank you,
Aishwarya
 
From: Neil Jerram [mailto:Neil.Jerram at metaswitch.com] 
Sent: Thursday, July 30, 2015 1:38 PM
To: Adyanthaya, Aishwarya; openstack-operators at lists.openstack.org
Subject: Re: [Openstack-operators] ssh inside instance
 
Hi Aishwarya, 
 
The basic requirement here is that anyone - which really means a 
combination of a computer or instance, plus a user on that 
computer/instance - needs to have the private key that matches the public 
key that is installed on the target instance. 
 
You've asked about logging in from your first instance ‎- let's call it A 
- so you need to save the private key in a file on A - let's call it 
private_key - and give it 600 permissions:
 
    chmod 600 private_key
 
Then you can use this key with SSH like this:
 
    ssh -i private_key USER at OTHER-INSTANCE
 
Hope that helps. 
 
Regards, 
      Neil 
 

From: aishwarya.adyanthaya at accenture.com
Sent: Thursday, 30 July 2015 05:24
To: openstack-operators at lists.openstack.org
Subject: [Openstack-operators] ssh inside instance
 
Hi,
 
I’ve launched two instances from my openstack dashboard. Firstly I created 
instance one, where I generated a key through the ssh-keygen command, 
pasting the public key contents to import key in the access and security. 
Using this key I launched second instance.
 
I want to be able to ssh the second instance from my first instance. Could 
someone tell me how to work it out?
 
Thank you,
Aishwarya Adyanthaya
 


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