+debug info
Signed-off-by: Nico Schottelius <nico@bento.schottelius.org>
This commit is contained in:
Nico Schottelius
parent
4ff34a7aa8
commit
a09ee9a814
1 changed files with 279 additions and 0 deletions
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@ -59,3 +59,282 @@ Allocated port 56844 for remote forward to localhost:22
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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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- 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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.. . .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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Welcome to a cdist automated system!
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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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[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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debug1: Remote connections from LOCALHOST:5555 forwarded to local address localhost:22
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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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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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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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Code handling forwarding / listening in the server:
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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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- child_set_env
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1236 child_set_env(&env, &envsize, "SSH_CONNECTION", buf);
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