Script to create self-signed CA certificates, server certificates, and client certificates for testing MongoDB with SSL

mongodb-ssl.sh

#!/bin/sh

# Generate self signed root CA cert
openssl req -nodes -x509 -newkey rsa:2048 -keyout ca.key -out ca.crt -subj "/C=AU/ST=NSW/L=Sydney/O=MongoDB/OU=root/CN=`hostname -f`/[email protected]"


# Generate server cert to be signed
openssl req -nodes -newkey rsa:2048 -keyout server.key -out server.csr -subj "/C=AU/ST=NSW/L=Sydney/O=MongoDB/OU=server/CN=`hostname -f`/[email protected]"

# Sign the server cert
openssl x509 -req -in server.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out server.crt

# Create server PEM file
cat server.key server.crt > server.pem


# Generate client cert to be signed
openssl req -nodes -newkey rsa:2048 -keyout client.key -out client.csr -subj "/C=AU/ST=NSW/L=Sydney/O=MongoDB/OU=client/CN=`hostname -f`/[email protected]"

# Sign the client cert
openssl x509 -req -in client.csr -CA ca.crt -CAkey ca.key -CAserial ca.srl -out client.crt

# Create client PEM file
cat client.key client.crt > client.pem


# Create clientPFX file (for Java, C#, etc)
# openssl pkcs12 -inkey client.key -in client.crt -export -out client.pfx


# Start mongod with SSL
# mkdir -p data/db
# mongod --sslMode requireSSL --sslPEMKeyFile server.pem --sslCAFile ca.crt --dbpath data/db --logpath data/mongod.log --fork

# Connect to mongod with SSL
# mongo --ssl --sslCAFile ca.crt --sslPEMKeyFile client.pem --host `hostname -f`

Can we Implement this if we the client is having dynamic IP's? is it possible to create Certificate based on username instead of client machine IP?
or is there is any other solution to establish secure connection for client which have dynamic IP's?