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

[Aris Adamantiadis <aris@xxxxxxxxxxxx>]

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
>