Re: ssh_connect fails: Received SSH_MSG_DISCONNECT 33554432:bad client public DH value

["Zvi Vered" <veredz72@xxxxxxxxx>]

Hi Aris,

Attached the cap file as saved with Wireshark.

I hope this is the right cap format.

Can you understand why the server sends a "disconnect" ?

The client is: 128.172.5.22
The server is: 128.172.82.55

Thanks,
Zvika

-----Original Message----- 
From: Aris Adamantiadis
Sent: Thursday, April 24, 2014 11:57 PM
To: libssh@xxxxxxxxxx
Subject: Re: ssh_connect fails: Received SSH_MSG_DISCONNECT 33554432:bad 
client public DH value

Please upload you .cap to cloudshark.org or attach it to the email, I
can't help without seeing the content of packets.

Aris
Le 24/04/14 22:46, Zvi Vered a écrit :
> Hi Aris,
>
> Is it possible to upload files ?
>
> Attached a snapshot from wireshark.
> It starts from the ARP request the clients sends till "Server:
> Disconnect".
>
> Thanks,
> Zvika
>
> -----Original Message----- From: Aris Adamantiadis
> Sent: Thursday, April 24, 2014 10:52 PM
> To: libssh@xxxxxxxxxx
> Subject: Re: ssh_connect fails: Received SSH_MSG_DISCONNECT
> 33554432:bad client public DH value
>
> Can you please record a tcpdump capture with tcpdump or wireshark and
> post it on cloudshark ? This happens pre-encryption.
>
> Aris
> Le 24/04/14 21:45, Zvi Vered a écrit :
> > Hi Aris,
> >
> > It happens every time.
> >
> > Thanks,
> > Zvika
> >
> > -----Original Message----- From: Aris Adamantiadis
> > Sent: Thursday, April 24, 2014 9:23 PM
> > To: libssh@xxxxxxxxxx
> > Subject: Re: ssh_connect fails: Received SSH_MSG_DISCONNECT
> > 33554432:bad client public DH value
> >
> > Hi,
> >
> > Does it happen every time you connect or only sometimes ? It's very
> > strange.
> >
> > Aris
> > Le 24/04/14 20:14, Zvi Vered a écrit :
> > > Dear Members,
> > >
> > > I ported libssh-0.6.3 and openssl-1.0.1g to vxWorks 6.9.2 (with very
> > > few code changes).
> > >
> > > Upon ssh_connect I got the messages listed below.
> > >
> > > As you can see the connection fails and the final message is:
> > >
> > > ssh_packet_disconnect_callback: Received SSH_MSG_DISCONNECT
> > > 33554432:bad client public DH value
> > >
> > > On the server side (running under RHEL 5.3) I got the following
> > > messages in /var/log/secure:
> > >
> > > expecting SSH2_MSG_KEXDH_INIT
> > > invalid public DH value (1 / 2048)
> > > Disconnecting: bad client public DH value
> > >
> > > What can cause this problem ?
> > >
> > > Thanks,
> > > Zvika
> > >
> > > -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> > >
> > >
> > >
> > > -> [1970/01/01 00:00:00.000000, 1] ssh_connect: libssh 0.6.3 (c)
> > > 2003-2014 Aris Adamantiadis, Andreas Schneider, and libssh
> > > contributors. Distributed under the LGPL, please refer to COPYING file
> > > for information about your rights, using threading threads_noop
> > > [1970/01/01 00:00:00.000064, 3] getai: host 128.172.82.55 matches an
> > > IP address
> > > [1970/01/01 00:00:00.000000, 2] ssh_socket_connect: Nonblocking
> > > connection socket: 6
> > > [1970/01/01 00:00:00.808925489, 2] ssh_connect: Socket connecting, now
> > > waiting for the callbacks to work
> > > [1974/09/05 19:44:04.145667616, 3] ssh_connect: ssh_connect: Actual
> > > timeout : 10000
> > > [2097/01/10 06:02:22.-286331154, 3] ssh_socket_pollcallback: Received
> > > POLLOUT in connecting state
> > > [2097/01/10 06:02:22.139554400, 1] socket_callback_connected: Socket
> > > connection callback: 1 (0)
> > > [1970/02/21 20:18:44.139848112, 3] callback_receive_banner: Received
> > > banner: SSH-2.0-OpenSSH_4.3
> > > [1974/09/05 19:43:04.000019, 1] ssh_client_connection_callback: SSH
> > > server banner: SSH-2.0-OpenSSH_4.3
> > > [1970/01/01 00:00:00.000000, 1] ssh_analyze_banner: Analyzing banner:
> > > SSH-2.0-OpenSSH_4.3
> > > [1974/06/07 14:41:52.147642244, 1] ssh_analyze_banner: We are talking
> > > to an OpenSSH client version: 4.3 (40300)
> > > [1970/01/01 00:00:00.000000, 3] ssh_socket_unbuffered_write: Enabling
> > > POLLOUT for socket
> > > [1970/01/01 00:17:04.131080, 3] ssh_packet_socket_callback: packet:
> > > read type 20 [len=700,padding=7,comp=692,payload=692]
> > > [1974/08/13 22:00:40.145663148, 3] ssh_packet_process: Dispatching
> > > handler for packet type 20
> > > [1970/02/23 18:37:26.147642212, 4] ssh_list_kex: kex algos:
> > > diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
> > >
> > >
> > > [1974/08/13 21:56:40.147642212, 4] ssh_list_kex: server host key algo:
> > > ssh-rsa,ssh-dss
> > > [1974/08/13 21:56:40.147642212, 4] ssh_list_kex: encryption
> > > client->server:
> > > aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@xxxxxxxxxxxxxx,aes128-ctr,aes192-ctr,aes256-ctr
> > >
> > >
> > > [1974/08/13 21:56:40.147642212, 4] ssh_list_kex: encryption
> > > server->client:
> > > aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@xxxxxxxxxxxxxx,aes128-ctr,aes192-ctr,aes256-ctr
> > >
> > >
> > > [1974/08/13 21:56:40.147642212, 4] ssh_list_kex: mac algo
> > > client->server:
> > > hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@xxxxxxxxxxx,hmac-sha1-96,hmac-md5-96
> > >
> > >
> > > [1974/08/13 21:56:40.147642212, 4] ssh_list_kex: mac algo
> > > server->client:
> > > hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@xxxxxxxxxxx,hmac-sha1-96,hmac-md5-96
> > >
> > >
> > > [1974/08/13 21:56:40.147642212, 4] ssh_list_kex: compression algo
> > > client->server: none,zlib@xxxxxxxxxxx
> > > [1974/08/13 21:56:40.147642212, 4] ssh_list_kex: compression algo
> > > server->client: none,zlib@xxxxxxxxxxx
> > > [1974/08/13 21:56:40.147642212, 4] ssh_list_kex: languages
> > > client->server:
> > > [1974/08/13 21:56:40.147642212, 4] ssh_list_kex: languages
> > > server->client:
> > > [1970/01/01 00:00:00.000000, 4] ssh_list_kex: kex algos:
> > > diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
> > > [1974/08/13 21:56:04.000000, 4] ssh_list_kex: server host key algo:
> > > ssh-rsa,ssh-dss
> > > [1974/08/13 21:56:04.000000, 4] ssh_list_kex: encryption
> > > client->server:
> > > aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes192-cbc,aes128-cbc,blowfish-cbc,3des-cbc,des-cbc-ssh1
> > >
> > >
> > > [1974/08/13 21:56:04.000000, 4] ssh_list_kex: encryption
> > > server->client:
> > > aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes192-cbc,aes128-cbc,blowfish-cbc,3des-cbc,des-cbc-ssh1
> > >
> > >
> > > [1974/08/13 21:56:04.000000, 4] ssh_list_kex: mac algo client->server:
> > > hmac-sha1
> > > [1974/08/13 21:56:04.000000, 4] ssh_list_kex: mac algo server->client:
> > > hmac-sha1
> > > [1974/08/13 21:56:04.000000, 4] ssh_list_kex: compression algo
> > > client->server: none
> > > [1974/08/13 21:56:04.000000, 4] ssh_list_kex: compression algo
> > > server->client: none
> > > [1974/08/13 21:56:04.000000, 4] ssh_list_kex: languages client->server:
> > > [1974/08/13 21:56:04.000000, 4] ssh_list_kex: languages server->client:
> > > [1974/08/13 21:36:36.000000, 3] packet_send2: packet: wrote
> > > [len=364,padding=6,comp=357,payload=357]
> > > [1974/08/13 21:55:44.145662852, 3] packet_send2: packet: wrote
> > > [len=12,padding=5,comp=6,payload=6]
> > > [1970/01/01 00:00:00.000000, 3] ssh_socket_unbuffered_write: Enabling
> > > POLLOUT for socket
> > > [1970/01/01 00:17:04.131080, 3] ssh_packet_socket_callback: packet:
> > > read type 1 [len=44,padding=4,comp=39,payload=39]
> > > [1974/08/13 22:00:40.145663148, 3] ssh_packet_process: Dispatching
> > > handler for packet type 1
> > > [1970/01/01 00:00:00.000000, 3] ssh_packet_disconnect_callback:
> > > Received SSH_MSG_DISCONNECT 33554432:bad client public DH value
> > > [1970/01/01 00:00:16.139880016, 1] ssh_packet_disconnect_callback:
> > > Received SSH_MSG_DISCONNECT: 33554432:bad client public DH value
> > > [1974/08/13 23:13:32.145667616, 3] ssh_connect: ssh_connect: Actual
> > > state : 9
> > > ssh_connect failed: Received SSH_MSG_DISCONNECT: 33554432:bad client
> > > public DH value

Attachment: ssh_disconnect.cap
Description: Binary data