The FreeBSD Diary

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Security

Shells

ssh


Security
	improving security * 11 Aug 1998 su - how to become a super user. avoid using `root` 18 Oct 1998 changing the pre-login text - also known as /etc/issue 6 Jan 1999 tcp wrapper - monitoring telnet requests, permit deny connections, etc. 9 Jan 1999 upgrading sendmail 11 Jan 1999 Staying current with FreeBSD - using CVSup to upgrade FreeBSD 14 Jan 1999 Before the disaster 14 Jan 1999 I was probed! The security worked. 2 Feb 1999 Upgrading to sendmail 8.9.3 18 Feb 1999 nologin - Refuse a login to a user, and make a note of it in syslog 9 Mar 1999 telnet fails - tcp_wrapper is out of date 18 Mar 1999 ssh - much more secure than telnet 25 Apr 1999 Private DNS 8 Jul 1999 toor - and why you should keep it 23 Jul 1999 ssh2 - when ssh won't do 13 Aug 1999 Changing the pre-login text - also known as /etc/issue - more info 22 Aug 1999 Upgrade your DNS server - bind8 security issues 20 Nov 1999 watch - making it work 29 Nov 1999 Installing OpenSSH - less restrictive than ssh 5 Dec 1999 logcheck - who is checking your logs? 19 Dec 1999 identd problems - patch 19 Dec 1999 unwanted email from tcpd 26 Dec 1999 PortSentry - a port watcher 1 Jan 2000 Front Page Extensions - security considerations 7 Jan 2000 Blocking apache access by host 27 Jan 2000 Big Brother is watching you (and your network) 18 Feb 2000 finger and how to supply something different 24 Feb 2000 How to copy files around without anyone seeing them 27 Mar 2000 What version of bind are you running? 3 Apr 2000 ssh - authorized keys and chmod 5 Apr 2000 Keeping mysql passwords secure 19 Apr 2000 passphrases are your friend 6 Jul 2000 VLAN with pipsecd 7 Jul 2000 turning sendmail VRFY off 8 Aug 2000 mindterm - ssh connections via web browsers 14 Nov 2000 IPsec 27 Dec 2000 Setting up an encrypted file system (by Niklas Saers) 6 Jan 2001 installing bind8 from ports 28 Mar 2001 qpopper with APOP 30 Mar 2001 Using smtp from remote locations 7 Apr 2001 Setting up a FreeBSD IPSec Tunnel (by John J. Rushford Jr) 7 Jun 2001 San Jose bound... 11 Jun 2001 Client Authentication with SSL 12 Jul 2001 ssh exploit - how to avoid it 14 Nov 2001 stunnel - another way to avoid plain text passwords (by Mike Miller) 16 Nov 2001 Anonymous FTP server (by Kim Scarborough) 30 Nov 2001 PostgreSQL 7.2 upgrade and crypto 23 Feb 2002 stunnel - encryption and security 10 Mar 2002 Creating a VPN using PPTP 26 Apr 2002 scp tricks 7 Mar 2003 Using a jail as a virtual machine 1 Sep 2004 Secure Your Wireless with IPsec 6 Dec 2004 Configuring IPsec on your XP Professional laptop 22 Dec 2005 Putting sshd on a higher port 4 Dec 2006 Cacti remote injection exploit 12 Jan 2007 Bacula - Transport Layer Security (TLS) 23 Jan 2007 Fighting spam with pf 9 Jul 2007 Virus scanning 9 Jul 2007 Creating your own Certificate Authority 27 Nov 2008 Obscuring smtp auth headers 2 Dec 2008 Removing Firefox 2 19 Oct 2009 logcheck - a log file scanner 29 Nov 2009 cssh - cluster ssh 26 Jan 2010


Shells
	Changing the shell (bash) 26 Jul 1998 su - how to become a super user. avoid using `root` 18 Oct 1998 Changing your bash prompt 6 Jan 1999 screen - how to detach a session from your window 22 Feb 1999 nologin - Refuse a login to a user, and make a note of it in syslog 9 Mar 1999 ssh - much more secure than telnet 25 Apr 1999 ssh2 - when ssh won't do 13 Aug 1999 periodic - using it to run shell scripts 9 Nov 1999 Installing OpenSSH - less restrictive than ssh 5 Dec 1999 Changing your tcsh prompt 14 Jan 2000 Changing the shell for existing users and new users 11 Aug 2000 grep, sed, and awk for fun and profit 9 Aug 2011


ssh
	ssh2 - when ssh won't do 13 Aug 1999 Installing OpenSSH - less restrictive than ssh 5 Dec 1999 Incoming ssh is being refused 20 Jan 2000 ssh - authorized keys and chmod 5 Apr 2000 mindterm - ssh connections via web browsers 14 Nov 2000 ssh exploit - how to avoid it 14 Nov 2001 Putting sshd on a higher port 4 Dec 2006 cssh - cluster ssh 26 Jan 2010