Lessons
SSH · Medium
Software / SSH · medium. Ten practical lessons. Open book. Lesson 1 free.
10 lessons · The Host · Lesson 1 free
Pass all ten lessons for the certificate. Sample · Claim
Lesson 1 · On the house
Certificates concept
Short-lived SSH certs instead of forever keys.
Lesson 2
Match blocks
Conditional sshd and client settings.
Lesson 3
ForceCommand
Lock a key or user to one command.
Lesson 4
Chroot SFTP
Jail file-transfer users.
Lesson 5
sshd_config AllowUsers
Allow-list who may connect.
Lesson 6
fail2ban concept
Ban repeated auth failures.
Lesson 7
Tunnels for databases
Keep DB ports off the public internet.
Lesson 8
SSH tunnels vs VPN
Pick the right privacy tool.
Lesson 9
Agent forwarding risks
Do not lend your keys blindly.
Lesson 10
sshfs concept
Mount a remote directory locally.
Sample certificate
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Certificate
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