Nico Schottelius
12 years ago
commit
e3f6769507
@ -0,0 +1,28 @@ |
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#!/usr/bin/env python3 |
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# -*- coding: utf-8 -*- |
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# |
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# 2013 Nico Schottelius (nico-cdist at schottelius.org) |
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# |
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# This file is part of cdist. |
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# |
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# cdist is free software: you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation, either version 3 of the License, or |
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# (at your option) any later version. |
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# |
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# cdist is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with cdist. If not, see <http://www.gnu.org/licenses/>. |
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# |
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# |
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|
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import os |
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|
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# SSH_CLIENT and SSH_CONNECTION available |
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src_ip = os.environ['SSH_CLIENT'].split()[0] |
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|
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print("Plain version: Connecting back to %s" % src_ip) |
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@ -0,0 +1,340 @@ |
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- analysis of ssh connections for callback |
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SSH_CLIENT='::1 38502 22' |
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SSH_CONNECTION='::1 38502 ::1 22' |
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|
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-> callback possible to source host |
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|
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|
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|
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[ target host ] <--------------| |
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| | |
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| | |
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| | |
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| trigger | configuration |
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| | |
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v | |
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[ configuration host ] ----| |
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|
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|
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- dynamic port allocation for tunneling |
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|
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[1:37] bento:~% ssh -R 0:localhost:22 localhost |
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Warning: Permanently added 'localhost' (ECDSA) to the list of known hosts. |
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Allocated port 53161 for remote forward to localhost:22 |
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|
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SSH_AUTH_SOCK=/tmp/ssh-zDCWbUVcUK/agent.30749 |
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SSH_CLIENT='::1 38587 22' |
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SSH_CONNECTION='::1 38587 ::1 22' |
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SSH_TTY=/dev/pts/21 |
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|
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|
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- ssh_config: |
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DynamicForward |
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LocalForward |
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RemoteForward |
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|
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- testing |
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|
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[1:52] bento:cdist% netstat -anp | grep 56844 |
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(Not all processes could be identified, non-owned process info |
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will not be shown, you would have to be root to see it all.) |
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tcp 0 0 127.0.0.1:56844 0.0.0.0:* LISTEN - |
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tcp6 0 0 ::1:56844 :::* LISTEN - |
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[1:53] bento:cdist% |
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|
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|
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[1:48] bento:~% ssh -R 0:localhost:22 localhost |
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Allocated port 56844 for remote forward to localhost:22 |
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... |
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|
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- chatting |
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|
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01:42 -!- Irssi: Join to #openssh was synced in 0 secs |
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01:42 < telmich> good evening |
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01:43 < telmich> I am trying to make use of remote port forwarding using dynamic port |
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allocation (port=0) -- I am wondering if there is an easy way to |
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access the port number on the remote side easily? |
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01:44 < telmich> background for this question is: I'd like to allow various clients to |
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login to a configuration server, which then configures the clients by |
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using the tunnel the client provides for the server to ssh back into |
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02:07 < BasketCase> telmich: afaik you need to use a tool like ss/netstat/lsof to see what port it has open |
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|
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- ssh debug |
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[11:37] bento:~% ssh -R 0:localhost:22 localhost |
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Allocated port 33562 for remote forward to localhost:22 |
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|
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.. . .x+=:. s |
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dF @88> z` ^% :8 |
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'88bu. %8P . <k .88 |
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. '*88888bu . .@8Ned8" :888ooo |
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.udR88N ^"*8888N .@88u .@^%8888" -*8888888 |
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<888'888k beWE "888L ''888E` x88: `)8b. 8888 |
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9888 'Y" 888E 888E 888E 8888N=*8888 8888 |
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9888 888E 888E 888E %8" R88 8888 |
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9888 888E 888F 888E @8Wou 9% .8888Lu= |
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?8888u../ .888N..888 888& .888888P` ^%888* |
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"8888P' `"888*"" R888" ` ^"F 'Y" |
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"P' "" "" |
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|
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Welcome to a cdist automated system! |
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|
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Last login: Sat May 4 01:52:46 2013 from localhost.localdomain |
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debug1: PAM: reinitializing credentials |
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debug1: permanently_set_uid: 0/0 |
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Environment: |
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USER=root |
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LOGNAME=root |
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HOME=/root |
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PATH=/usr/bin:/bin:/usr/sbin:/sbin |
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MAIL=/var/spool/mail/root |
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SHELL=/bin/bash |
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SSH_CLIENT=::1 57848 22 |
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SSH_CONNECTION=::1 57848 ::1 22 |
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SSH_TTY=/dev/pts/32 |
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TERM=rxvt-unicode |
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XDG_SESSION_ID=1 |
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XDG_RUNTIME_DIR=/run/user/1000 |
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XDG_SEAT=seat0 |
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XDG_VTNR=1 |
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SSH_AUTH_SOCK=/tmp/ssh-6j0elukLHA/agent.17260 |
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[root@bento ~]# |
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[root@bento nico]# /usr/sbin/sshd -D -d |
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debug1: sshd version OpenSSH_6.2, OpenSSL 1.0.1e 11 Feb 2013 |
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debug1: read PEM private key done: type RSA |
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debug1: private host key: #0 type 1 RSA |
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debug1: read PEM private key done: type DSA |
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debug1: private host key: #1 type 2 DSA |
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debug1: read PEM private key done: type ECDSA |
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debug1: private host key: #2 type 3 ECDSA |
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debug1: rexec_argv[0]='/usr/sbin/sshd' |
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debug1: rexec_argv[1]='-D' |
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debug1: rexec_argv[2]='-d' |
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Set /proc/self/oom_score_adj from 0 to -1000 |
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debug1: Bind to port 22 on 0.0.0.0. |
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Server listening on 0.0.0.0 port 22. |
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debug1: Bind to port 22 on ::. |
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Server listening on :: port 22. |
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debug1: Server will not fork when running in debugging mode. |
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debug1: rexec start in 5 out 5 newsock 5 pipe -1 sock 8 |
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debug1: inetd sockets after dupping: 3, 3 |
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Connection from ::1 port 57848 |
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debug1: Client protocol version 2.0; client software version OpenSSH_6.2 |
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debug1: match: OpenSSH_6.2 pat OpenSSH* |
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debug1: Enabling compatibility mode for protocol 2.0 |
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debug1: Local version string SSH-2.0-OpenSSH_6.2 |
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debug1: permanently_set_uid: 99/99 [preauth] |
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debug1: list_hostkey_types: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256 [preauth] |
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debug1: SSH2_MSG_KEXINIT sent [preauth] |
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debug1: SSH2_MSG_KEXINIT received [preauth] |
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debug1: kex: client->server aes128-ctr hmac-md5-etm@openssh.com zlib@openssh.com [preauth] |
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debug1: kex: server->client aes128-ctr hmac-md5-etm@openssh.com zlib@openssh.com [preauth] |
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debug1: expecting SSH2_MSG_KEX_ECDH_INIT [preauth] |
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debug1: SSH2_MSG_NEWKEYS sent [preauth] |
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debug1: expecting SSH2_MSG_NEWKEYS [preauth] |
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debug1: SSH2_MSG_NEWKEYS received [preauth] |
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debug1: KEX done [preauth] |
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debug1: userauth-request for user root service ssh-connection method none [preauth] |
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debug1: attempt 0 failures 0 [preauth] |
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debug1: PAM: initializing for "root" |
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debug1: PAM: setting PAM_RHOST to "localhost.localdomain" |
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debug1: PAM: setting PAM_TTY to "ssh" |
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debug1: userauth-request for user root service ssh-connection method publickey [preauth] |
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debug1: attempt 1 failures 0 [preauth] |
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debug1: test whether pkalg/pkblob are acceptable [preauth] |
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debug1: temporarily_use_uid: 0/0 (e=0/0) |
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debug1: trying public key file /root/.ssh/authorized_keys |
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debug1: fd 4 clearing O_NONBLOCK |
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debug1: matching key found: file /root/.ssh/authorized_keys, line 2 |
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Found matching RSA key: 2e:1b:3f:10:01:1d:21:6c:6c:1e:3d:a9:33:ba:3c:f7 |
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debug1: restore_uid: 0/0 |
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Postponed publickey for root from ::1 port 57848 ssh2 [preauth] |
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debug1: userauth-request for user root service ssh-connection method publickey [preauth] |
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debug1: attempt 2 failures 0 [preauth] |
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debug1: temporarily_use_uid: 0/0 (e=0/0) |
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debug1: trying public key file /root/.ssh/authorized_keys |
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debug1: fd 4 clearing O_NONBLOCK |
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debug1: matching key found: file /root/.ssh/authorized_keys, line 2 |
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Found matching RSA key: 2e:1b:3f:10:01:1d:21:6c:6c:1e:3d:a9:33:ba:3c:f7 |
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debug1: restore_uid: 0/0 |
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debug1: ssh_rsa_verify: signature correct |
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debug1: do_pam_account: called |
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Accepted publickey for root from ::1 port 57848 ssh2 |
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debug1: monitor_child_preauth: root has been authenticated by privileged process |
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debug1: Enabling compression at level 6. [preauth] |
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debug1: monitor_read_log: child log fd closed |
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debug1: PAM: establishing credentials |
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debug1: Entering interactive session for SSH2. |
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debug1: server_init_dispatch_20 |
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debug1: server_input_global_request: rtype tcpip-forward want_reply 1 |
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debug1: server_input_global_request: tcpip-forward listen localhost port 0 |
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debug1: Local forwarding listening on ::1 port 0. |
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debug1: Allocated listen port 33562 |
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debug1: channel 0: new [port listener] |
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debug1: Local forwarding listening on 127.0.0.1 port 33562. |
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debug1: channel 1: new [port listener] |
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debug1: server_input_channel_open: ctype session rchan 0 win 1048576 max 16384 |
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debug1: input_session_request |
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debug1: channel 2: new [server-session] |
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debug1: session_new: session 0 |
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debug1: session_open: channel 2 |
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debug1: session_open: session 0: link with channel 2 |
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debug1: server_input_channel_open: confirm session |
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debug1: server_input_global_request: rtype no-more-sessions@openssh.com want_reply 0 |
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debug1: server_input_channel_req: channel 2 request auth-agent-req@openssh.com reply 0 |
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debug1: session_by_channel: session 0 channel 2 |
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debug1: session_input_channel_req: session 0 req auth-agent-req@openssh.com |
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debug1: temporarily_use_uid: 0/0 (e=0/0) |
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debug1: restore_uid: 0/0 |
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debug1: channel 3: new [auth socket] |
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debug1: server_input_channel_req: channel 2 request pty-req reply 1 |
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debug1: session_by_channel: session 0 channel 2 |
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debug1: session_input_channel_req: session 0 req pty-req |
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debug1: Allocating pty. |
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debug1: session_pty_req: session 0 alloc /dev/pts/32 |
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debug1: server_input_channel_req: channel 2 request shell reply 1 |
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debug1: session_by_channel: session 0 channel 2 |
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debug1: session_input_channel_req: session 0 req shell |
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debug1: Setting controlling tty using TIOCSCTTY. |
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-------------------------------------------------------------------------------- |
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debug1: server_input_global_request: rtype tcpip-forward want_reply 1 |
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debug1: server_input_global_request: tcpip-forward listen localhost port 0 |
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debug1: Local forwarding listening on ::1 port 0. |
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debug1: Allocated listen port 33562 |
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debug1: channel 0: new [port listener] |
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debug1: Local forwarding listening on 127.0.0.1 port 33562. |
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[11:49] bento:openssh-6.2p1% grep "Allocated listen port" -r . |
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./channels.c: debug("Allocated listen port %d", |
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[11:49] bento:openssh-6.2p1% |
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-------------------------------------------------------------------------------- |
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[11:54] bento:~% ssh -R 0:localhost:22 -R 0:192.168.1.1:33 localhost |
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Allocated port 48392 for remote forward to localhost:22 |
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Allocated port 37515 for remote forward to 192.168.1.1:33 |
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debug1: server_input_global_request: rtype tcpip-forward want_reply 1 |
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debug1: server_input_global_request: tcpip-forward listen localhost port 0 |
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debug1: Local forwarding listening on ::1 port 0. |
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debug1: Allocated listen port 48392 |
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debug1: channel 0: new [port listener] |
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debug1: Local forwarding listening on 127.0.0.1 port 48392. |
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debug1: channel 1: new [port listener] |
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debug1: server_input_global_request: rtype tcpip-forward want_reply 1 |
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debug1: server_input_global_request: tcpip-forward listen localhost port 0 |
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debug1: Local forwarding listening on ::1 port 0. |
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debug1: Allocated listen port 37515 |
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debug1: channel 2: new [port listener] |
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debug1: Local forwarding listening on 127.0.0.1 port 37515. |
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debug1: channel 3: new [port listener] |
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debug1: server_input_channel_open: ctype session rchan 0 win 1048576 max 16384 |
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debug1: input_session_request |
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debug1: channel 4: new [server-session] |
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debug1: session_new: session 0 |
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debug1: session_open: channel 4 |
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debug1: session_open: session 0: link with channel 4 |
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debug1: Local forwarding listening on ::1 port 5555. |
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debug1: channel 0: new [port listener] |
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debug1: Local forwarding listening on 127.0.0.1 port 5555. |
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debug1: channel 1: new [port listener] |
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debug1: server_input_global_request: rtype tcpip-forward want_reply 1 |
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debug1: server_input_global_request: tcpip-forward listen localhost port 4444 |
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debug1: Local forwarding listening on ::1 port 4444. |
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debug1: channel 2: new [port listener] |
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debug1: Local forwarding listening on 127.0.0.1 port 4444. |
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debug1: channel 3: new [port listener] |
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debug1: server_input_channel_open: ctype session rchan 0 win 1048576 max 16384 |
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debug1: input_session_request |
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debug1: channel 4: new [server-session] |
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debug1: session_new: session 0 |
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debug1: session_open: channel 4 |
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-------------------------------------------------------------------------------- |
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|
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[12:06] bento:openssh-6.2p1% grep SSH_CONNECTION -r * |
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audit-bsm.c: case SSH_CONNECTION_CLOSE: |
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audit.c: {SSH_CONNECTION_CLOSE, "CONNECTION_CLOSE"}, |
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audit.c: {SSH_CONNECTION_ABANDON, "CONNECTION_ABANDON"}, |
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audit.h: SSH_CONNECTION_CLOSE, /* closed after attempting auth or session */ |
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audit.h: SSH_CONNECTION_ABANDON, /* closed without completing auth */ |
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audit-linux.c: case SSH_CONNECTION_CLOSE: |
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monitor.c: case SSH_CONNECTION_CLOSE: |
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regress/proxy-connect.sh: SSH_CONNECTION=`${SSH} -$p -F $OBJ/ssh_proxy 999.999.999.999 'echo $SSH_CONNECTION'` |
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regress/proxy-connect.sh: if [ "$SSH_CONNECTION" != "UNKNOWN 65535 UNKNOWN 65535" ]; then |
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regress/proxy-connect.sh: fail "bad SSH_CONNECTION" |
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session.c: child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
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sftp-server.c: if ((cp = getenv("SSH_CONNECTION")) != NULL) { |
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sftp-server.c: error("Malformed SSH_CONNECTION variable: \"%s\"", |
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sftp-server.c: getenv("SSH_CONNECTION")); |
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ssh.0: SSH_CONNECTION Identifies the client and server ends of the |
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ssh.1:.It Ev SSH_CONNECTION |
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sshd.c: PRIVSEP(audit_event(SSH_CONNECTION_CLOSE)); |
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sshd.c: audit_event(SSH_CONNECTION_ABANDON); |
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[12:06] bento:openssh-6.2p1% |
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|
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-------------------------------------------------------------------------------- |
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debug1: Remote connections from LOCALHOST:5555 forwarded to local address localhost:22 |
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|
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-------------------------------------------------------------------------------- |
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[12:42] bento:openssh-6.2p1% grep tcpip-forward * |
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channels.c: packet_put_cstring("tcpip-forward"); |
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channels.c: packet_put_cstring("cancel-tcpip-forward"); |
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Binary file channels.o matches |
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grep: contrib: Is a directory |
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Binary file libssh.a matches |
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grep: openbsd-compat: Is a directory |
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grep: regress: Is a directory |
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grep: scard: Is a directory |
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serverloop.c: if (strcmp(rtype, "tcpip-forward") == 0) { |
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serverloop.c: debug("server_input_global_request: tcpip-forward listen %s port %d", |
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serverloop.c: } else if (strcmp(rtype, "cancel-tcpip-forward") == 0) { |
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serverloop.c: debug("%s: cancel-tcpip-forward addr %s port %d", __func__, |
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Binary file serverloop.o matches |
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Binary file ssh matches |
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Binary file sshd matches |
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Binary file ssh-keyscan matches |
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Binary file ssh-keysign matches |
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[12:42] bento:openssh-6.2p1% |
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-------------------------------------------------------------------------------- |
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Channel information for (remote) forwarding: |
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|
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c = channel_new("port listener", type, sock, sock, -1, |
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CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
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0, "port listener", 1); |
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c->path = xstrdup(host); |
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c->host_port = port_to_connect; |
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c->listening_addr = addr == NULL ? NULL : xstrdup(addr); |
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if (listen_port == 0 && allocated_listen_port != NULL && |
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!(datafellows & SSH_BUG_DYNAMIC_RPORT)) |
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c->listening_port = *allocated_listen_port; |
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else |
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c->listening_port = listen_port; |
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|
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-------------------------------------------------------------------------------- |
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|
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Code handling remote forwarding in the client: |
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- ssh_init_forwarding |
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- channel_request_remote_forwarding |
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Sends hostname + port for ssh1 only - not send in ssh2 |
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|
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Code handling forwarding / listening in the server: |
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|
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- channel_new: creates channels, 2 per listener (ipv4/ipv6) |
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- channels_alloc contains number of channels |
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- server_input_global_request |
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Reads only listen port, not hostname/port to connect to |
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- channel_setup_remote_fwd_listener |
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- channel_setup_remote_fwd_listener |
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Code handling environment variables: |
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|
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- child_set_env |
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1236 child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
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@ -0,0 +1,40 @@ |
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|
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start ssh |
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to controlhost, |
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bind other side to |
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localhost:22 |
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|
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|
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targethost ------> ssh ------> controlhost |
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| |
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| |
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socat: connect stdin/stdout to ? |
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start cdist with port information |
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added |
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|
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|
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Use |
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|
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socat |
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|
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|
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-------------------------------------------------------------------------------- |
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TCP:<host>:<port> |
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Connects to <port> [TCP service] on <host> [IP address] using TCP/IP version 4 or 6 depending on address specifi‐ |
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cation, name resolution, or option pf. |
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Option groups: FD,SOCKET,IP4,IP6,TCP,RETRY |
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Useful options: crnl, bind, pf, connect-timeout, tos, mtudiscover, mss, nodelay, nonblock, sourceport, retry, |
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readbytes |
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See also: TCP4, TCP6, TCP-LISTEN, UDP, SCTP-CONNECT, UNIX-CONNECT |
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|
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forever |
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-------------------------------------------------------------------------------- |
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[root@nico-dev-vm-snr01 yum.repos.d]# ps aux | grep socat |
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nico 25035 0.0 0.0 41640 1524 ? Ss 13:27 0:00 socat - TCP-LISTEN:1234 |
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root 25037 0.0 0.0 103240 836 pts/1 S+ 13:27 0:00 grep socat |
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[root@nico-dev-vm-snr01 yum.repos.d]# |
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|
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|
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|
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-------------------------------------------------------------------------------- |
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|
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