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  7. 💻 OpenSSH

💻 OpenSSH


Hardening (see also: fail2ban)

  • sudov /etc/ssh/sshd_config

    ++ PermitRootLogin no

Logs

  • sudo tail -n 50 /var/log/auth.log

Basic Local SSH (BAD–but handy for throw away local VMs)

  • ssh -p 22 user@192.168.254.x

    • [Enter Password]

  • apt-get install sshpass

  • sshpass -p your_password ssh user@192.168.254.x

  • Script it

    • gpg --full-generate-key

    • mkdir $HOME/.passcrypt

    • vim ssh (create password file)

    • gpg --encrypt $HOME/.passcrypt/ssh.gpg

      #!/bin/bash
sshpassw="$(gpg -d $HOME/.passcrypt/ssh.gpg |)"
sshpass -p $sshpassw ssh user@192.168.254.x

  • See also: fail2ban & iptables

Copy Files

  • From Remote to local

    • scp username@b:/path/to/file /path/to/destination

  • From local to remote

    • scp /path/to/file username@b:/path/to/destination

Copy Directories

  • scp -prq username@host:/path/to/file/ /path/to/destination/

  • scp -prq /path/to/file/ username@host:/path/to/destination/

Run X Programs on remote

  • Setup

    • export DISPLAY:=0

  • Send keyboard keys to GUI apps

    • xdotool key --window "$(xdotool search --class mpv)" p

Mount Filesystems from remote

  • mkdir /mnt/destination

  • sshfs user@host:/source /mnt/destination

  • cd /mnt/destination

Mount Filesystems to remote

  • mkdir /mnt/destination

  • sshfs /source user@host:/destination

  • cd /mnt/destination

Fish Network Protocol

  • Dolphin File Browser: fish://user@xxx.xxx.xxx

  • MC: cd sh://user@xxx.xxx.xxx

  • Similar to Secure FTP

Remote Linux filesystem with Windows Explorer

Edit files with VSCode, etc.

Passwordless login (bad)

  • ssh-keygen -t rsa -b 4096 -C "your_email@domain.com" #username@reminder.com

    • Press enter for all entries

  • ssh-copy-ide remote@remotesystem

Passwordless login (it’s probaby fine)

  • eval $(ssh-agent)u

  • ssh-add

    • OR: ssh-add /home/user/.ssh/id_(...)

    • OR ssh-add /home/user/.ssh/id_superdupersshkey

  • Enter password

  • vim (or nano) ~/.profile

    • eval "$(ssh-agent)"

      For persistence between logins

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