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

[Aris Adamantiadis <aris@xxxxxxxxxxxx>]

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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>
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