Re: Fw:Re:ssh_handle_key_exchange timeout in some machine

[Andreas Schneider <asn@xxxxxxxxxxxxxx>]

On Saturday, 14 October 2017 13:29:12 CET 312 wrote:
> The difference are :
> 
> My env are:
> libssh 0.7.5
> fail client:  openssh 6.6
> successfully client: openssh 7.3
> And I found in this thread openssh6.6 have some bug that may caused some
> issue to make connection fail.
> https://bbs.archlinux.org/viewtopic.php?id=189535
> But I am not really understand it completely.

Could you check if this fixes it:

https://git.libssh.org/projects/libssh.git/commit/?
id=380390c4b6dca9bda52707807b3ee577f758b107

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> -------- 转发邮件信息 --------
> 发件人："312" <moan1223@xxxxxxx>
> 发送日期：2017-10-14 12:21:35
> 收件人：312 <moan1223@xxxxxxx>
> 抄送人："libssh@xxxxxxxxxx" <libssh@xxxxxxxxxx>
> 主题：Re:ssh_handle_key_exchange timeout in some machine
> 
> My env are:
> libssh 0.7.5
> fail client: CentOS Linux release 7.2.1511 (Core)
> successfully client: window 10 cygwin
> 
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> At 2017-10-14 12:05:52, "312" <moan1223@xxxxxxx> wrote:
> 
> Dear libssh developer,
> 
> 
> I found that only when some client, ssh_handle_key_exchange function will
> timeout. For example,
> If I started a ssh sever and connect the server by 'ssh myuser@10.104.196.18
> -P 6990' The server output log like this. Because I know little about
> libssh internal, so I cannot find why this only happened on some ssh
> clients. And I have no idea on how to further debug this issue. I need
> someone to give me some clues. Thanks.
> ~~~
> [zhengjie@localhost examples]$ sudo ./ssh_server_fork
> --ecdsakey=/etc/ssh/ssh_host_ecdsa_key   -d ~/.ssh/id_dsa -r
> /etc/ssh/ssh_host_rsa_key -p 6990 -v 10.104.196.18 [2017/10/14
> 11:48:28.545161, 3] packet_send2:  packet: wrote
> [len=28,padding=11,comp=16,payload=16] [2017/10/14 11:48:28.545897, 3]
> ssh_socket_pollcallback:  Received POLLOUT in connecting state [2017/10/14
> 11:48:28.546206, 3] ssh_socket_unbuffered_write:  Enabling POLLOUT for
> socket [2017/10/14 11:48:38.556532, 3] ssh_handle_key_exchange: 
> ssh_handle_key_exchange: current state : 2
> 
> 
> [2017/10/14 11:48:38.556640, 3] ssh_socket_unbuffered_write:  Enabling
> POLLOUT for socket [2017/10/14 11:48:38.556671, 3] packet_send2:  packet:
> wrote [len=28,padding=11,comp=16,payload=16] start to bindbegin to
> fork[2017/10/14 11:51:06.217847, 3] packet_send2:  packet: wrote
> [len=28,padding=11,comp=16,payload=16] [2017/10/14 11:51:06.218884, 3]
> ssh_socket_pollcallback:  Received POLLOUT in connecting state [2017/10/14
> 11:51:06.220702, 3] ssh_socket_unbuffered_write:  Enabling POLLOUT for
> socket [2017/10/14 11:51:16.229942, 3] ssh_handle_key_exchange: 
> ssh_handle_key_exchange: current state : 2
> 
> 
> [2017/10/14 11:51:16.230105, 3] ssh_socket_unbuffered_write:  Enabling
> POLLOUT for socket [2017/10/14 11:51:16.230134, 3] packet_send2:  packet:
> wrote [len=28,padding=11,comp=16,payload=16] start to bindbegin to
> forkstart to bindbegin to fork[2017/10/14 11:51:31.926009, 3] packet_send2:
>  packet: wrote [len=28,padding=11,comp=16,payload=16] [2017/10/14
> 11:51:31.926863, 3] ssh_socket_pollcallback:  Received POLLOUT in
> connecting state [2017/10/14 11:51:31.927066, 3]
> ssh_socket_unbuffered_write:  Enabling POLLOUT for socket [2017/10/14
> 11:51:41.938226, 3] ssh_handle_key_exchange:  ssh_handle_key_exchange:
> current state : 2
> 
> 
> [2017/10/14 11:51:41.938326, 3] ssh_socket_unbuffered_write:  Enabling
> POLLOUT for socket [2017/10/14 11:51:41.938352, 3] packet_send2:  packet:
> wrote [len=28,padding=11,comp=16,payload=16] start to bindbegin to
> forkstart to bindbegin to forkstart to bindbegin to fork
> ^C[zhengjie@localhost examples]$ sudo ./ssh_server_fork
> --ecdsakey=/etc/ssh/ssh_host_ecdsa_key   -d ~/.ssh/id_dsa -r
> /etc/ssh/ssh_host_rsa_key -p 6990 -v 10.104.196.18 [2017/10/14
> 11:55:49.005142, 3] packet_send2:  packet: wrote
> [len=28,padding=11,comp=16,payload=16] [2017/10/14 11:55:49.006125, 3]
> ssh_socket_pollcallback:  Received POLLOUT in connecting state [2017/10/14
> 11:55:49.007918, 3] ssh_socket_unbuffered_write:  Enabling POLLOUT for
> socket [2017/10/14 11:55:59.017861, 3] ssh_handle_key_exchange: 
> ssh_handle_key_exchange: current state : 2
> 
> 
> [2017/10/14 11:55:59.018245, 3] ssh_socket_unbuffered_write:  Enabling
> POLLOUT for socket [2017/10/14 11:55:59.018275, 3] packet_send2:  packet:
> wrote [len=28,padding=11,comp=16,payload=16] start to bindbegin to fork
> 
> 
> ~~~
> 
> 
> Best Regards
> Zhengjie
> 
> 
> 
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-- 
Andreas Schneider                   GPG-ID: CC014E3D
www.cryptomilk.org                asn@xxxxxxxxxxxxxx