Custom CA Certificate

Extracted from: http://forums.contribs.org/index.php?topic=34624.0

Author: slords

As root do the following:

mkdir ~/cacert
cd ~/cacert 

Make a file named cacert_csr_request

#!/usr/bin/perl

use strict;
use esmith::util;
use esmith::ConfigDB;
use esmith::DomainsDB;

my $config   = esmith::ConfigDB->open;
my $domainsdb = esmith::DomainsDB->open_ro;

my $domain = $config->get('DomainName')->value;
my %domain_names = map { $_->{key} => 1 } grep { $_->key ne $domain } $domainsdb->domains;

my @domains = ($domain, keys %domain_names);

open(CONFIG, ">$domains[0].config") or die "Can't open openssl config file: $!";
print CONFIG "HOME = .\nRANDFILE = \$ENV::HOME/.rnd\n\n";
print CONFIG "[ req ]\ndefault_bits = 1024\ndistinguished_name = req_distinguished_name\n";
print CONFIG "req_extensions = v3_req\nprompt = no\n\n";
print CONFIG "[ req_distinguished_name ]\nCN = $domains[0]\n\n";
print CONFIG "[ v3_req ]\nbasicConstraints = CA:FALSE\nkeyUsage = nonRepudiation,digitalSignature,keyEncipherment\n";
print CONFIG "subjectAltName = critical,", join ",", map { "DNS:$_,DNS:*.$_" } @domains;
print CONFIG "\n";
close(CONFIG) or die "Closing openssl config file reported: $!";

unless ( -f "$domains[0].key" )
{
    open(KEY, ">$domains[0].key") or die "Can't open key file: $!";
    unless (open(SSL,"-|"))
    {
        exec("/usr/bin/openssl",
            qw(genrsa -rand),
            join(':',
            qw(
                /proc/apm
                /proc/cpuinfo
                /proc/dma
                /proc/filesystems
                /proc/interrupts
                /proc/ioports
                /proc/bus/pci/devices
                /proc/rtc
                /proc/uptime
                )),
            '1024')
            || die "can't exec program: $!";
    }
    while (<SSL>)
    {
        print KEY $_;
    }
    close(SSL) or die "Closing openssl pipe reported: $!";
    close(KEY) or die "Closing key file reported: $!";
}

open(CSR, ">$domains[0].csr") or die "Can't open csr $!";
unless (open(SSL,"-|"))
{
    exec("/usr/bin/openssl",
        qw(req -config), "$domains[0].config",
        qw(-new -key), "$domains[0].key",
        qw(-days 730 -set_serial), time())
        || die "can't exec program: $!";
}
while (<SSL>)
{
    print CSR $_;
}
close(SSL) or die "Closing openssl pipe reported: $!";
close(CSR) or die "Closing csr file reported: $!";

• Change permissions

chmod u+x cacert_csr_request

• Execute the file

./cacert_csr_request

From here replace the {domain} tag with your Primary domain name. Also you will need to have all domains registered with your cacert.org account. This will create a certificate that includes all domains that exists on your sme box as both simple domain.com and wildcard *.domain.com.

• Paste the output into the cacert.org website and get your certificate

cat {domain}.csr

Then save your CA certificate in a file named ~/cacert/{domain}.crt

• Copy to final location

cp {domain}.crt /home/e-smith/ssl.crt/{domain}.crt 
cp {domain}.key /home/e-smith/ssl.key/{domain}.key