Hi Meng, Thank you for the patch. It worked for us. Verified it in Cisco IOS 12.4, 15.4 and Ubuntu 16.04
Regards, Jijo On Tue, Oct 23, 2018 at 9:39 PM Meng Hourk Tan <[email protected]> wrote: > Hello, > > I had the same issue with some Cisco router: > > Some Cisco IOS do not send kex if they send the banner last (libssh as a > client sent it first). > > In this situation, both libssh client and Cisco IOS server hang. > > Libssh client should send kex init as soon as banners are exchanged. > > > I attached a patch that fix this issue. > Regards, > > > Meng > ------------------------------ > *De :* jijo thomas <[email protected]> > *Envoyé :* mardi 23 octobre 2018 08:48:02 > *À :* [email protected] > *Objet :* libssh 0.8.4 with Cisco router > > Hi, > > I compiled libssh 0.8.4 in Windows > > Then ran into a strange issue with libssh 0.8.4 while working with Cisco > router (ios ver 15.4) while executing the sample exec.c from the bundle. > > The ssh connection to the device is getting established alternatively. ie) > It fails once at analyzing banner. if I try again, it'll work fine. > > Following is the log. > > Attempt 1 > exec.exe x.x.x.x > [2018/10/23 11:43:55.012458, 2] ssh_connect: libssh 0.8.4 (c) 2003-2018 > Aris Ad > amantiadis, Andreas Schneider and libssh contributors. Distributed under > the LGP > L, please refer to COPYING file for information about your rights, using > threadi > ng threads_winlock > [2018/10/23 11:43:55.015458, 2] ssh_socket_connect: Nonblocking > connection sock > et: 196 > [2018/10/23 11:43:55.016458, 2] ssh_connect: Socket connecting, now > waiting for > the callbacks to work > [2018/10/23 11:43:55.531488, 1] socket_callback_connected: Socket > connection ca > llback: 1 (0) > [2018/10/23 11:43:56.128522, 1] ssh_client_connection_callback: SSH > server bann > er: SSH-2.0-Cisco-1.25 > [2018/10/23 11:43:56.129522, 1] ssh_analyze_banner: Analyzing banner: > SSH-2.0-C > isco-1.25 > [2018/10/23 11:44:05.018031, 1] ssh_connect: Timeout connecting to x.x.x.x > Connection failed : Timeout connecting to x.x.x.x > > Attempt 2 > > exec.exe x.x.x.x > [2018/10/23 11:59:31.880044, 2] ssh_connect: libssh 0.8.4 (c) 2003-2018 > Aris Ad > amantiadis, Andreas Schneider and libssh contributors. Distributed under > the LGP > L, please refer to COPYING file for information about your rights, using > threadi > ng threads_winlock > [2018/10/23 11:59:31.882044, 2] ssh_socket_connect: Nonblocking > connection sock > et: 196 > [2018/10/23 11:59:31.883044, 2] ssh_connect: Socket connecting, now > waiting for > the callbacks to work > [2018/10/23 11:59:32.391073, 1] socket_callback_connected: Socket > connection ca > llback: 1 (0) > [2018/10/23 11:59:32.899102, 1] ssh_client_connection_callback: SSH > server bann > er: SSH-2.0-Cisco-1.25 > [2018/10/23 11:59:32.900102, 1] ssh_analyze_banner: Analyzing banner: > SSH-2.0-C > isco-1.25 > [2018/10/23 11:59:32.905103, 2] ssh_kex_select_methods: Negotiated > diffie-hellm > > an-group14-sha1,ssh-rsa,aes256-ctr,aes256-ctr,hmac-sha1,hmac-sha1,none,none,, > [2018/10/23 11:59:34.053168, 2] ssh_packet_dh_reply: Received > SSH_KEXDH_REPLY > [2018/10/23 11:59:34.064169, 2] ssh_client_dh_reply: SSH_MSG_NEWKEYS sent > [2018/10/23 11:59:34.561197, 2] ssh_packet_newkeys: Received > SSH_MSG_NEWKEYS > [2018/10/23 11:59:34.563197, 2] ssh_packet_newkeys: Signature verified > and vali > d > [2018/10/23 11:59:35.793268, 1] ssh_packet_userauth_failure: Access > denied for > 'none'. Authentication that can continue: > publickey,keyboard-interactive,passwor > d > [2018/10/23 11:59:35.794268, 2] ssh_packet_userauth_failure: Access > denied for > 'none'. Authentication that can continue: > publickey,keyboard-interactive,passwor > d > > . > . > . > > [2018/10/23 11:59:35.803268, 2] ssh_userauth_publickey_auto: Tried every > public > key, none matched > Password: > [2018/10/23 11:59:38.955449, 2] channel_open: Creating a channel 43 with > 64000 > window and 32768 max packet > [2018/10/23 11:59:39.463478, 2] ssh_packet_channel_open_conf: Received a > CHANNE > L_OPEN_CONFIRMATION for channel 43:3 > [2018/10/23 11:59:39.464478, 2] ssh_packet_channel_open_conf: Remote > window : 8 > 192, maxpacket : 4096 > [2018/10/23 11:59:39.974507, 2] channel_request: Channel request exec > success > [2018/10/23 11:59:39.975507, 2] grow_window: growing window (channel > 43:3) to 1 > 280000 bytes > > 22:29:39.716 PST Mon Oct 22 2018 > > > >
