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

Hi Aris,
For the vxWorks compilation I created a new Makefile that compiles all the files in libssh.a created with the original Makefile created by cmake. 

I'm also using the same config.h created by cmake.
But I suspect I'm not using all the -D switches used in the linux compilation. 

Where can I see the -D switches that I should use ?

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
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