In this video, learn how to secure the SSH service.
- [Narrator] Whenever possible…use the SSH2 version of the SSH protocol.…It contains several improvements over SSHv1.…Some of those improvements include…a different set of improved and stronger algorithms…for encryption and authentication.…Use the protocol configuration directive…in the SSHD config file followed…by 2 to force version 2 of the SSH protocol.…By default, SSH will listen on all addresses on the system.…If you want to control what IP address SSHD binds to…use the listen address directive…and specify the IP to listen on.…
If you want to listen on multiple IP addresses…use multiple listen address lines.…You can use this in situations…where you have a system that is connected to both…a public and a private network.…This way you can force SSH to only listen…on the private network and reduce your attack surface.…By default, SSH runs on port 22.…If you want to change the default port…supply the new port number to the port directive…in the SSHD underscore config file.…Changing the port that SSH listens on…
Author
Released
6/11/2018- What makes Linux secure?
- Physical security concepts
- Encrypting new and existing devices
- Account and network security
- Linux firewall fundamentals
- File system security
- File and directory permissions
- ACLs and rootkits
Skill Level Intermediate
Duration
Views
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Introduction
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Welcome1m 25s
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1. General Security
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General security1m 9s
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Is Linux secure?2m 26s
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What makes Linux secure?8m 18s
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2. Physical Security
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Physical security concepts7m 41s
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Single user mode security6m 45s
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Secure the bootloader6m 57s
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Disk encryption5m 34s
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Encrypt a new device: Part 18m 38s
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Encrypt a new device: Part 24m 17s
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Disable Control-Alt-Delete1m 44s
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3. Account Security
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Account security45s
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Introduction to PAM5m 13s
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Password security7m 58s
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Control account access5m 6s
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Security by account type6m 1s
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Account security: Demo 22m 44s
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4. Network Security
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Network security35s
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Network security: Part 17m 54s
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Network security: Part 26m 20s
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Secure SSHD: Part 17m 52s
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Secure SSHD: Part 23m 15s
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Linux firewall fundamentals7m 36s
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Firewall rule specifications4m 43s
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Example firewall rules3m 59s
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Linux firewall demo9m 47s
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TCP Wrappers: Part 17m 2s
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TCP Wrappers: Part 24m 2s
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5. File System Security
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File system security1m 2s
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Special modes: Part 17m 55s
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Special modes: Part 23m 4s
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File attributes6m 5s
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File attributes demo2m 48s
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ACLs9m 25s
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ACLs demo6m 13s
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Rootkits8m 33s
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Rootkit hunter demo7m 12s
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Conclusion
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Summary4m 52s
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Video: Secure SSHD: Part 2