ssh
Secure server access and tunneling with SSH. Use when a user asks to connect to remote servers, set up SSH keys, create tunnels, configure jump hosts, manage SSH config, or automate remote commands.
What this skill does
# SSH ## Overview SSH (Secure Shell) provides encrypted remote access to servers. Beyond basic login, it handles key-based auth, port forwarding (tunnels), jump hosts (bastion), file transfer (SCP/SFTP), and agent forwarding. ## Instructions ### Step 1: Key Setup ```bash # Generate ED25519 key (recommended over RSA) ssh-keygen -t ed25519 -C "[email protected]" # Copy public key to server ssh-copy-id [email protected] # Or manually: cat ~/.ssh/id_ed25519.pub | ssh user@server "mkdir -p ~/.ssh && cat >> ~/.ssh/authorized_keys" ``` ### Step 2: SSH Config ```text # ~/.ssh/config — Named host configurations Host prod HostName 203.0.113.10 User deploy Port 2222 IdentityFile ~/.ssh/deploy_key Host staging HostName staging.example.com User deploy ProxyJump bastion Host bastion HostName bastion.example.com User admin IdentityFile ~/.ssh/bastion_key Host dev-* HostName %h.internal.example.com User developer ProxyJump bastion ``` ```bash # Now just: ssh prod # connects to 203.0.113.10:2222 as deploy ssh staging # connects through bastion ssh dev-api # connects to dev-api.internal.example.com via bastion ``` ### Step 3: Tunneling ```bash # Local forward: access remote service locally ssh -L 5432:db.internal:5432 bastion # Now connect to localhost:5432 to reach the internal database # Remote forward: expose local service to remote ssh -R 8080:localhost:3000 prod # Remote server can now reach your local app at localhost:8080 # Dynamic SOCKS proxy ssh -D 1080 prod # Use as SOCKS proxy for all traffic ``` ### Step 4: Server Hardening ```text # /etc/ssh/sshd_config — Production SSH hardening PermitRootLogin no PasswordAuthentication no PubkeyAuthentication yes MaxAuthTries 3 ClientAliveInterval 300 ClientAliveCountMax 2 AllowUsers deploy admin Port 2222 ``` ## Guidelines - Always use key-based auth in production — disable password auth. - ED25519 keys are shorter and more secure than RSA. - Use ProxyJump (bastion/jump host) instead of exposing internal servers to the internet. - `ssh-agent` caches keys in memory — no need to enter passphrase repeatedly.
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