OpenSSH tricks

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Some useful tricks using OpenSSH

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OpenSSH tricks

  1. 1. . . OpenSSH tricks Assem Chelli assem.ch@gmail.com (@assem_ch) Hacknowledge Contest Algeria 2013 . Assem Chelli OpenSSH tricks . . . . .
  2. 2. . What is SSH? SSH: Secure SHell, a Network protocol Created by Tatu Ylonen (1995) Secure logging into remote computer Public key authentication (!Password), Authentication of the server (!MAN-IN-THE-MIDDLE ) Encryption, Integrity more features: Stream Compression Port forwarding X11 sessions forwarding File transfer . Assem Chelli OpenSSH tricks . . . . .
  3. 3. . WHY SSH IS SO IMPORTANT? IP spoofing IP source routing DNS spoofing Password sniffing Manipulation of transfer data Atack on X11 (sniffing on authorization) . Assem Chelli OpenSSH tricks . . . . .
  4. 4. . Install Open SSH SSH is so resricted , OPEN SSH is free! openssh-client , openssh-server sudo apt-get install openssh-client openssh-server sudo yum install openssh-client openssh-server WINDOWS: download & install PuTTY http://www.chiark.greenend.org.uk/ sgtatham/putty/ . Assem Chelli OpenSSH tricks . . . . .
  5. 5. . Basic SSH usage Remote login ssh hostname ssh -l user hostname ssh user@hostname cd:41:70:30:48:07:16:81:e5:30:34:66:f1:56:ef:db RSA key fingerprint —> yes / no (Public Key authentification) host’s password: _______ (Password authentification) known hosts ~/.ssh/known_hosts . Assem Chelli OpenSSH tricks . . . . .
  6. 6. . Basic SSH usage Remote login ssh hostname ssh -l user hostname ssh user@hostname cd:41:70:30:48:07:16:81:e5:30:34:66:f1:56:ef:db RSA key fingerprint —> yes / no (Public Key authentification) host’s password: _______ (Password authentification) known hosts ~/.ssh/known_hosts . Assem Chelli OpenSSH tricks . . . . .
  7. 7. . Omar in the middle! let’s play SERVER role! We put Server offline Someone fix his IP as the same IP of server Now try login again ssh host @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Someone could be eavesdropping on you right now (man-in-the-middle attack)! It is also possible that the RSA host key has just been changed. . Assem Chelli OpenSSH tricks . . . . .
  8. 8. . Omar in the middle! let’s play SERVER role! We put Server offline Someone fix his IP as the same IP of server Now try login again ssh host @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Someone could be eavesdropping on you right now (man-in-the-middle attack)! It is also possible that the RSA host key has just been changed. . Assem Chelli OpenSSH tricks . . . . .
  9. 9. . SSH replaces telnet. ssh host.domena.pl ssh user@host.domena.pl ssh -l user host.domena.pl . Assem Chelli OpenSSH tricks . . . . .
  10. 10. . SSH replaces FTP. sftp host.domena.pl sftp> dir . Assem Chelli OpenSSH tricks . . . . .
  11. 11. . SSH replaces r-command . rexec ssh host "cat /etc/passwd" rlogin ssh user@host rcp scp file host.domena.pl . Assem Chelli OpenSSH tricks . . . . .
  12. 12. . Executing commands remotely ssh host netstat ssh host "ls -C /bin" ssh host “cat /etc/passwd” ssh host “vi /tmp/foo ” ssh -t host vi /tmp/foo . Assem Chelli OpenSSH tricks . . . . .
  13. 13. . Executing commands remotely ssh host netstat ssh host "ls -C /bin" ssh host “cat /etc/passwd” ssh host “vi /tmp/foo ” ssh -t host vi /tmp/foo . Assem Chelli OpenSSH tricks . . . . .
  14. 14. . Redirecting commands input and output ssh host "ls /bin | grep -i rm" ssh host "ls /bin" | grep -i rm ssh host "cat /etc/passwd" > remote_passwd ssh host "psql billing" < billing.sql | grep -v ^INFO . Assem Chelli OpenSSH tricks . . . . .
  15. 15. . Redirecting commands input and output ssh host "ls /bin | grep -i rm" ssh host "ls /bin" | grep -i rm ssh host "cat /etc/passwd" > remote_passwd ssh host "psql billing" < billing.sql | grep -v ^INFO . Assem Chelli OpenSSH tricks . . . . .
  16. 16. . File transfer scp scp [user1@]host1:/path/to/source/file [user2@]host2:/path/to/destination/file scp -r sftp sftp host sftp> cd /usr/share/games sftp> ls sftp> lcd /tmp get c* quit tar-over-ssh ssh host "cd /usr/share/games ; tar cf - ./a*" | > (cd /tmp ; tar xpvf -) rsync rsync -ve ssh host:/bin/c* /tmp . Assem Chelli OpenSSH tricks . . . . .
  17. 17. . Public Keys Generate a public key ssh-keygen -t rsa cat ~/.ssh/id_rsa.pub Authentification ssh-add -l Restrictions cat ~/.ssh/authorized_keys . Assem Chelli OpenSSH tricks . . . . .
  18. 18. . Default Config Files and SSH Port /etc/ssh/sshd_config - OpenSSH server configuration file. /etc/ssh/ssh_config - OpenSSH client configuration file. ~/.ssh/ - Users ssh configuration directory. ~/.ssh/authorized_keys - Lists the public keys (RSA or DSA) that can be used to log into the users account /etc/nologin - If this file exists, sshd refuses to let anyone except root log in. /etc/hosts.allow and /etc/hosts.deny : Access controls lists that should be enforced by tcp-wrappers are defined here. SSH default port : TCP ?? . Assem Chelli OpenSSH tricks . . . . .
  19. 19. . Default Config Files and SSH Port /etc/ssh/sshd_config - OpenSSH server configuration file. /etc/ssh/ssh_config - OpenSSH client configuration file. ~/.ssh/ - Users ssh configuration directory. ~/.ssh/authorized_keys - Lists the public keys (RSA or DSA) that can be used to log into the users account /etc/nologin - If this file exists, sshd refuses to let anyone except root log in. /etc/hosts.allow and /etc/hosts.deny : Access controls lists that should be enforced by tcp-wrappers are defined here. SSH default port : TCP ?? . Assem Chelli OpenSSH tricks . . . . .
  20. 20. . Default Config Files and SSH Port /etc/ssh/sshd_config - OpenSSH server configuration file. /etc/ssh/ssh_config - OpenSSH client configuration file. ~/.ssh/ - Users ssh configuration directory. ~/.ssh/authorized_keys - Lists the public keys (RSA or DSA) that can be used to log into the users account /etc/nologin - If this file exists, sshd refuses to let anyone except root log in. /etc/hosts.allow and /etc/hosts.deny : Access controls lists that should be enforced by tcp-wrappers are defined here. SSH default port : TCP ?? . Assem Chelli OpenSSH tricks . . . . .
  21. 21. . Default Config Files and SSH Port /etc/ssh/sshd_config - OpenSSH server configuration file. /etc/ssh/ssh_config - OpenSSH client configuration file. ~/.ssh/ - Users ssh configuration directory. ~/.ssh/authorized_keys - Lists the public keys (RSA or DSA) that can be used to log into the users account /etc/nologin - If this file exists, sshd refuses to let anyone except root log in. /etc/hosts.allow and /etc/hosts.deny : Access controls lists that should be enforced by tcp-wrappers are defined here. SSH default port : TCP ?? . Assem Chelli OpenSSH tricks . . . . .
  22. 22. . Default Config Files and SSH Port /etc/ssh/sshd_config - OpenSSH server configuration file. /etc/ssh/ssh_config - OpenSSH client configuration file. ~/.ssh/ - Users ssh configuration directory. ~/.ssh/authorized_keys - Lists the public keys (RSA or DSA) that can be used to log into the users account /etc/nologin - If this file exists, sshd refuses to let anyone except root log in. /etc/hosts.allow and /etc/hosts.deny : Access controls lists that should be enforced by tcp-wrappers are defined here. SSH default port : TCP ?? . Assem Chelli OpenSSH tricks . . . . .
  23. 23. . Default Config Files and SSH Port /etc/ssh/sshd_config - OpenSSH server configuration file. /etc/ssh/ssh_config - OpenSSH client configuration file. ~/.ssh/ - Users ssh configuration directory. ~/.ssh/authorized_keys - Lists the public keys (RSA or DSA) that can be used to log into the users account /etc/nologin - If this file exists, sshd refuses to let anyone except root log in. /etc/hosts.allow and /etc/hosts.deny : Access controls lists that should be enforced by tcp-wrappers are defined here. SSH default port : TCP ?? . Assem Chelli OpenSSH tricks . . . . .
  24. 24. . Default Config Files and SSH Port /etc/ssh/sshd_config - OpenSSH server configuration file. /etc/ssh/ssh_config - OpenSSH client configuration file. ~/.ssh/ - Users ssh configuration directory. ~/.ssh/authorized_keys - Lists the public keys (RSA or DSA) that can be used to log into the users account /etc/nologin - If this file exists, sshd refuses to let anyone except root log in. /etc/hosts.allow and /etc/hosts.deny : Access controls lists that should be enforced by tcp-wrappers are defined here. SSH default port : TCP ?? . Assem Chelli OpenSSH tricks . . . . .
  25. 25. . BEST SSH Tricks 1 . Copy ssh keys to user@host to enable password-less ssh logins 1 ssh-copy-id user@host . Start a tunnel from some machines port 80 to your local post 2001 2 ssh -N -L2001:localhost:80 somemachine . Output your microphone to a remote computers speaker 3 dd if=/dev/dsp | ssh -c arcfour -C username@host dd of=/dev/dsp . Compare a remote file with a local file 4 ssh user@host cat /path/to/remotefile | diff /path/to/localfile - . Mount folder/filesystem through SSH 5 ss hfs name@server:/path/to/folder /path/to/mount/point . Assem Chelli OpenSSH tricks . . . . .
  26. 26. . BEST SSH Tricks 1 . Copy ssh keys to user@host to enable password-less ssh logins 1 ssh-copy-id user@host . Start a tunnel from some machines port 80 to your local post 2001 2 ssh -N -L2001:localhost:80 somemachine . Output your microphone to a remote computers speaker 3 dd if=/dev/dsp | ssh -c arcfour -C username@host dd of=/dev/dsp . Compare a remote file with a local file 4 ssh user@host cat /path/to/remotefile | diff /path/to/localfile - . Mount folder/filesystem through SSH 5 ss hfs name@server:/path/to/folder /path/to/mount/point . Assem Chelli OpenSSH tricks . . . . .
  27. 27. . BEST SSH Tricks 1 . Copy ssh keys to user@host to enable password-less ssh logins 1 ssh-copy-id user@host . Start a tunnel from some machines port 80 to your local post 2001 2 ssh -N -L2001:localhost:80 somemachine . Output your microphone to a remote computers speaker 3 dd if=/dev/dsp | ssh -c arcfour -C username@host dd of=/dev/dsp . Compare a remote file with a local file 4 ssh user@host cat /path/to/remotefile | diff /path/to/localfile - . Mount folder/filesystem through SSH 5 ss hfs name@server:/path/to/folder /path/to/mount/point . Assem Chelli OpenSSH tricks . . . . .
  28. 28. . BEST SSH Tricks 1 . Copy ssh keys to user@host to enable password-less ssh logins 1 ssh-copy-id user@host . Start a tunnel from some machines port 80 to your local post 2001 2 ssh -N -L2001:localhost:80 somemachine . Output your microphone to a remote computers speaker 3 dd if=/dev/dsp | ssh -c arcfour -C username@host dd of=/dev/dsp . Compare a remote file with a local file 4 ssh user@host cat /path/to/remotefile | diff /path/to/localfile - . Mount folder/filesystem through SSH 5 ss hfs name@server:/path/to/folder /path/to/mount/point . Assem Chelli OpenSSH tricks . . . . .
  29. 29. . BEST SSH Tricks 1 . Copy ssh keys to user@host to enable password-less ssh logins 1 ssh-copy-id user@host . Start a tunnel from some machines port 80 to your local post 2001 2 ssh -N -L2001:localhost:80 somemachine . Output your microphone to a remote computers speaker 3 dd if=/dev/dsp | ssh -c arcfour -C username@host dd of=/dev/dsp . Compare a remote file with a local file 4 ssh user@host cat /path/to/remotefile | diff /path/to/localfile - . Mount folder/filesystem through SSH 5 ss hfs name@server:/path/to/folder /path/to/mount/point . Assem Chelli OpenSSH tricks . . . . .
  30. 30. . BEST SSH Tricks 2 . SSH connection through host in the middle 1 ssh -t reachable_host ssh unreachable_host . Copy from host1 to host2, through your host 2 ssh root@host1 cd /somedir/tocopy/ && tar -cf . | ssh root@host2 cd /samedir/tocopyto/ && tar -xf - . Run any GUI program remotely 3 ssh -fX @ . Create a persistent connection to a machine 4 ssh -MNf @ . Attach screen over ssh 5 ssh -t remote_host screen -r . Assem Chelli OpenSSH tricks . . . . .
  31. 31. . BEST SSH Tricks 2 . SSH connection through host in the middle 1 ssh -t reachable_host ssh unreachable_host . Copy from host1 to host2, through your host 2 ssh root@host1 cd /somedir/tocopy/ && tar -cf . | ssh root@host2 cd /samedir/tocopyto/ && tar -xf - . Run any GUI program remotely 3 ssh -fX @ . Create a persistent connection to a machine 4 ssh -MNf @ . Attach screen over ssh 5 ssh -t remote_host screen -r . Assem Chelli OpenSSH tricks . . . . .
  32. 32. . BEST SSH Tricks 2 . SSH connection through host in the middle 1 ssh -t reachable_host ssh unreachable_host . Copy from host1 to host2, through your host 2 ssh root@host1 cd /somedir/tocopy/ && tar -cf . | ssh root@host2 cd /samedir/tocopyto/ && tar -xf - . Run any GUI program remotely 3 ssh -fX @ . Create a persistent connection to a machine 4 ssh -MNf @ . Attach screen over ssh 5 ssh -t remote_host screen -r . Assem Chelli OpenSSH tricks . . . . .
  33. 33. . BEST SSH Tricks 2 . SSH connection through host in the middle 1 ssh -t reachable_host ssh unreachable_host . Copy from host1 to host2, through your host 2 ssh root@host1 cd /somedir/tocopy/ && tar -cf . | ssh root@host2 cd /samedir/tocopyto/ && tar -xf - . Run any GUI program remotely 3 ssh -fX @ . Create a persistent connection to a machine 4 ssh -MNf @ . Attach screen over ssh 5 ssh -t remote_host screen -r . Assem Chelli OpenSSH tricks . . . . .
  34. 34. . BEST SSH Tricks 2 . SSH connection through host in the middle 1 ssh -t reachable_host ssh unreachable_host . Copy from host1 to host2, through your host 2 ssh root@host1 cd /somedir/tocopy/ && tar -cf . | ssh root@host2 cd /samedir/tocopyto/ && tar -xf - . Run any GUI program remotely 3 ssh -fX @ . Create a persistent connection to a machine 4 ssh -MNf @ . Attach screen over ssh 5 ssh -t remote_host screen -r . Assem Chelli OpenSSH tricks . . . . .
  35. 35. . BEST SSH Tricks 3 . Run complex remote shell cmds over ssh 1 ssh host -l user $( ssh host -l user cat cmd.txt . Resume scp of a big file 2 rsync partial progress rsh=ssh $file_source $user@$host:$destination_file . Analyze traffic remotely over ssh w/ wireshark 3 ssh root@server.com tshark -f port !22 -w - | wireshark -k -i - . Have an ssh session open forever 4 autossh -M50000 -t server.example.com screen -raAd mysession . Harder, Faster, Stronger SSH clients 5 ssh -4 -C -c blowfish-cbc . Assem Chelli OpenSSH tricks . . . . .
  36. 36. . BEST SSH Tricks 3 . Run complex remote shell cmds over ssh 1 ssh host -l user $( ssh host -l user cat cmd.txt . Resume scp of a big file 2 rsync partial progress rsh=ssh $file_source $user@$host:$destination_file . Analyze traffic remotely over ssh w/ wireshark 3 ssh root@server.com tshark -f port !22 -w - | wireshark -k -i - . Have an ssh session open forever 4 autossh -M50000 -t server.example.com screen -raAd mysession . Harder, Faster, Stronger SSH clients 5 ssh -4 -C -c blowfish-cbc . Assem Chelli OpenSSH tricks . . . . .
  37. 37. . BEST SSH Tricks 3 . Run complex remote shell cmds over ssh 1 ssh host -l user $( ssh host -l user cat cmd.txt . Resume scp of a big file 2 rsync partial progress rsh=ssh $file_source $user@$host:$destination_file . Analyze traffic remotely over ssh w/ wireshark 3 ssh root@server.com tshark -f port !22 -w - | wireshark -k -i - . Have an ssh session open forever 4 autossh -M50000 -t server.example.com screen -raAd mysession . Harder, Faster, Stronger SSH clients 5 ssh -4 -C -c blowfish-cbc . Assem Chelli OpenSSH tricks . . . . .
  38. 38. . BEST SSH Tricks 3 . Run complex remote shell cmds over ssh 1 ssh host -l user $( ssh host -l user cat cmd.txt . Resume scp of a big file 2 rsync partial progress rsh=ssh $file_source $user@$host:$destination_file . Analyze traffic remotely over ssh w/ wireshark 3 ssh root@server.com tshark -f port !22 -w - | wireshark -k -i - . Have an ssh session open forever 4 autossh -M50000 -t server.example.com screen -raAd mysession . Harder, Faster, Stronger SSH clients 5 ssh -4 -C -c blowfish-cbc . Assem Chelli OpenSSH tricks . . . . .
  39. 39. . BEST SSH Tricks 3 . Run complex remote shell cmds over ssh 1 ssh host -l user $( ssh host -l user cat cmd.txt . Resume scp of a big file 2 rsync partial progress rsh=ssh $file_source $user@$host:$destination_file . Analyze traffic remotely over ssh w/ wireshark 3 ssh root@server.com tshark -f port !22 -w - | wireshark -k -i - . Have an ssh session open forever 4 autossh -M50000 -t server.example.com screen -raAd mysession . Harder, Faster, Stronger SSH clients 5 ssh -4 -C -c blowfish-cbc . Assem Chelli OpenSSH tricks . . . . .
  40. 40. . Best SSH tricks 4 . Disable OpenSSH Server 1 apt-get remove openssh-server (ubuntu ) chkconfig sshd off && yum erase openssh-server (fedora) . Force to use SSH protocole 2 because SSH-1 is vulnerable (Man-in-the-middle attacks) 2 in /etc/ssh/sshd_config add the line: Protocol 2 . Limit root or Users’ SSH Access 3 in /etc/ssh/sshd_config find&modify the line: AllowUsers root assem or find&modify the line: DenyUsers omar zaki ali-baba or find&modify the line: PermitRootLogin no or create /etc/nologin . Enable a Warning Banner 4 in /etc/ssh/sshd_config add the line: Banner /etc/issue . Assem Chelli OpenSSH tricks . . . . .
  41. 41. . Best SSH tricks 4 . Disable OpenSSH Server 1 apt-get remove openssh-server (ubuntu ) chkconfig sshd off && yum erase openssh-server (fedora) . Force to use SSH protocole 2 because SSH-1 is vulnerable (Man-in-the-middle attacks) 2 in /etc/ssh/sshd_config add the line: Protocol 2 . Limit root or Users’ SSH Access 3 in /etc/ssh/sshd_config find&modify the line: AllowUsers root assem or find&modify the line: DenyUsers omar zaki ali-baba or find&modify the line: PermitRootLogin no or create /etc/nologin . Enable a Warning Banner 4 in /etc/ssh/sshd_config add the line: Banner /etc/issue . Assem Chelli OpenSSH tricks . . . . .
  42. 42. . Best SSH tricks 4 . Disable OpenSSH Server 1 apt-get remove openssh-server (ubuntu ) chkconfig sshd off && yum erase openssh-server (fedora) . Force to use SSH protocole 2 because SSH-1 is vulnerable (Man-in-the-middle attacks) 2 in /etc/ssh/sshd_config add the line: Protocol 2 . Limit root or Users’ SSH Access 3 in /etc/ssh/sshd_config find&modify the line: AllowUsers root assem or find&modify the line: DenyUsers omar zaki ali-baba or find&modify the line: PermitRootLogin no or create /etc/nologin . Enable a Warning Banner 4 in /etc/ssh/sshd_config add the line: Banner /etc/issue . Assem Chelli OpenSSH tricks . . . . .
  43. 43. . Best SSH tricks 4 . Disable OpenSSH Server 1 apt-get remove openssh-server (ubuntu ) chkconfig sshd off && yum erase openssh-server (fedora) . Force to use SSH protocole 2 because SSH-1 is vulnerable (Man-in-the-middle attacks) 2 in /etc/ssh/sshd_config add the line: Protocol 2 . Limit root or Users’ SSH Access 3 in /etc/ssh/sshd_config find&modify the line: AllowUsers root assem or find&modify the line: DenyUsers omar zaki ali-baba or find&modify the line: PermitRootLogin no or create /etc/nologin . Enable a Warning Banner 4 in /etc/ssh/sshd_config add the line: Banner /etc/issue . Assem Chelli OpenSSH tricks . . . . .
  44. 44. . Best SSH tricks 5 . Change SSH port 1 in /etc/ssh/sshd_config find&modify the line: Port 300 . Deny empty passwords 2 in /etc/ssh/sshd_config find&modify the line: PermitEmptyPasswords no . Use SSH as an Internet Proxy 3 Google it ! . Assem Chelli OpenSSH tricks . . . . .
  45. 45. . Best SSH tricks 5 . Change SSH port 1 in /etc/ssh/sshd_config find&modify the line: Port 300 . Deny empty passwords 2 in /etc/ssh/sshd_config find&modify the line: PermitEmptyPasswords no . Use SSH as an Internet Proxy 3 Google it ! . Assem Chelli OpenSSH tricks . . . . .
  46. 46. . Best SSH tricks 5 . Change SSH port 1 in /etc/ssh/sshd_config find&modify the line: Port 300 . Deny empty passwords 2 in /etc/ssh/sshd_config find&modify the line: PermitEmptyPasswords no . Use SSH as an Internet Proxy 3 Google it ! . Assem Chelli OpenSSH tricks . . . . .
  47. 47. . Best SSH tricks 5 . Change SSH port 1 in /etc/ssh/sshd_config find&modify the line: Port 300 . Deny empty passwords 2 in /etc/ssh/sshd_config find&modify the line: PermitEmptyPasswords no . Use SSH as an Internet Proxy 3 Google it ! . Assem Chelli OpenSSH tricks . . . . .
  48. 48. . Thwart SSH Crackers DenyHosts Fail2ban security/sshguard security/sshblock . Assem Chelli OpenSSH tricks . . . . .
  49. 49. . SSH via Proxy! Proxy Problem! /etc/ssh/ssh_config host * proxyCommand connect -H 10.0.0.1:80 %h %p . Assem Chelli OpenSSH tricks . . . . .
  50. 50. . SSH via Proxy! Proxy Problem! /etc/ssh/ssh_config host * proxyCommand connect -H 10.0.0.1:80 %h %p . Assem Chelli OpenSSH tricks . . . . .
  51. 51. . forwarding over SSH Agent forwarding ssh -A trustedhost (your privatekeys can be stolen) X11 forwarding ssh -X user@host firefox ssh -Y user@host Port forwarding ssh -L8000:anotherhost:80 somehost . Assem Chelli OpenSSH tricks . . . . .
  52. 52. . Tunneling types LocalForward RemoteForward DynamicForward ProxyCommand ForwardX11/ForwardX11Trusted Tunnel ControlMaster . Assem Chelli OpenSSH tricks . . . . .
  53. 53. . Security ssh-agent X11 GatewayPorts MITM SSH-1.99 SSH timing attack . Assem Chelli OpenSSH tricks . . . . .
  54. 54. Appendix . Questions Questions? . Assem Chelli OpenSSH tricks . . . . .
  55. 55. Appendix For Further Reading . For Further Reading I SSH tips, tricks & protocol tutorial .Damien Miller , AUUG Winter 2002 . 25 Best SSH Commands / Tricks. http://www.newitperson.com/2012/01/25-ssh-commandstricks/ SSH manpage . Assem Chelli OpenSSH tricks . . . . .

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