After rebuilding Bud due to successful attacks, a number of suggestions were made, and some of them implemented to improve security:

• Require complex passwords
• Require PKA for all admin users
• Create a wheel group to restrict su access

groupadd –system wheel

• Remove sudo entirely

  //from the Omnitec Wiki//

Postfix and Apache both use the SSL certificates in /etc/ssl/ for secure communications and TLS authenication. The guide for creating the keys is at openssl.htm (http://www.nomoa.com/bsd/openssl.htm)

* Backup /etc/ssl/openssl.cnf to /etc/ssl/openssl.cnf.original and change/add defaults to be specific to SLUUG:

• countryName_default = US
• localityName_default = St. Louis

* Generate the private server key with passphrase.

openssl genrsa -des3 -out /etc/ssl/private/server.key 1024

* Generate the certificate request with defaults from the modified openssl.cnf. For the "Common Name" enter the servers fqdn e.g. bud.sluug.org

sudo `which openssl` req -new -key /etc/ssl/private/server.key -out /etc/ssl/private/server.csr -config ./openssl.cnf

Self sign the certificate request to produce the certificate.

openssl x509 -req -days 3650   -in /etc/ssl/private/server.csr   -signkey /etc/ssl/private/server.key   -out /etc/ssl/server.crt

Next copy the key and cert created to /etc/ssl/private/postfix.key and /etc/ssl/postfix.crt and change group so postfix can read it.

cp /etc/ssl/private/server.key /etc/ssl/private/postfix.key
cp /etc/ssl/postfix.crt /etc/ssl/postfix.crt
chown :postfix /etc/ssl/private/postfix.key
chown :postfix /etc/ssl/postfix.crt