Be your own CA

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Tired of untrusted SSL messages? Then why not be your own Certificate Authority !?


This how-to describes how to generate your own CA certificate and generate and sign your own certificates.


Generate a CA Certificate and Key

Become the root user

su -
mkdir -m 0755 CA CA/private CA/certs CA/newcerts CA/crl
cd CA
touch index.txt
echo 1000 > serial
cp /etc/ssl/openssl.cnf .
chmod 600 index.txt serial openssl.cnf 

Modify the following parameters in the just copied file openssl.cnf

default_md = sha256
default_bits = 2048
dir = . # Where everything is kept
certificate = $dir/certs/myca.crt # The CA certificate
private_key = $dir/private/myca.key # The private key

Generate your CA certificate

openssl req -config openssl.cnf -new -x509 -extensions v3_ca -keyout private/myca.key -out certs/myca.crt -days 7300

The certificate will be valid for about 20 years.


Keep your password and key safe!

chmod 400 private/myca.key 

Generate a Certificate Request

Generate your B3 server certificate.


Note:


Fill in your B3 server name when asked the question: Common Name (eg, YOUR name) []:


Just hit enter when asked the question: A challenge password []:


otherwise you would be forced to enter the password everytime you start or restart the Apache webserver

openssl req -config openssl.cnf -new -nodes -keyout private/server.key -out server.csr -days 3650

The certificate will be valid for about 10 years.


Keep the key safe

chmod 400 private/server.key

Sign the Certificate Request

openssl ca -config openssl.cnf -policy policy_anything -out certs/server.crt -infiles server.csr
rm server.csr

Verify the certificate

openssl x509 -subject -issuer -enddate -noout -in certs/server.crt
openssl verify -purpose sslserver -CAfile certs/myca.crt certs/server.crt

Bounce Apache

Replace the old certifcates with your new certificates

cp /etc/apache2/cacert.pem /etc/apache2/cacert.pem.orig
cp /etc/apache2/privkey.pem /etc/apache2/privkey.pem.orig

cp /root/CA/certs/server.crt /etc/apache2/cacert.pem
cp /root/CA/private/server.key /etc/apache2/privkey.pem

Restart the Apache webserver

/etc/init.d/apache2 restart

Import the CA certificate

Import the CA certificate, this is file /root/CA/certs/myca.crt, into the browser of your choice.


You could also make it publicly available for http access by coping the file to (for example) /home/web.


References