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
• Provide a script to automate certification generation, providing defaults for standard data

/usr/local/sbin/openssk-gencrt

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
  • stateOrProvinceName_default = Missouri
  • localityName_default = St. Louis
  • 0.organizationName_default = St. Louis Unix User's Group
  • commonName_default = Sysadmin
  • emailAddress = postmaster@sluug.org

• Generate the private server key with passphrase.

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

• Remove the passphrase (cannot use a passphrase with a server)

openssl rsa -in pass.key -out server.key

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

openssl req -new -key /etc/ssl/private/<name>.key -out /etc/ssl/private/<name>.csr

Self sign the certificate request to produce the certificate.

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

Next copy the key and cert created to the /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

• Launch openssl-keygen with the desired Certificate Name as an argument

openssl-gencrt <Certificate Name>

• The defaults for SLUUG are provided - a <cr> will accept them; some information is required.
• Enter a passphrase for the key - it will be removed in the second step

• Country: [US]
• Locale: [St. Louis]
• Organization: [St. Louis Unix User Group

• Common name (Server fqdn):

• Any of the defaults may be overridden at creation time