On the Mac, you can create a certificate that's fully trusted by Chrome and Safari at the system level by doing the following:
# create a root authority cert
./create_root_cert_and_key.sh
# create a wildcard cert for mysite.com
./create_certificate_for_domain.sh mysite.com
# or create a cert for www.mysite.com, no wildcards
./create_certificate_for_domain.sh www.mysite.com www.mysite.com
If you want to create a new self signed cert that's fully trusted using your own root authority, you can do it using these scripts.
create_root_cert_and_key.sh
#!/usr/bin/env bash
openssl genrsa -out rootCA.key 2048
openssl req -x509 -new -nodes -key rootCA.key -sha256 -days 1024 -out rootCA.pem
create_certificate_for_domain.sh
#!/usr/bin/env bash
if [ -z "$1" ]
then
echo "Please supply a subdomain to create a certificate for";
echo "e.g. www.mysite.com"
exit;
fi
if [ ! -f rootCA.pem ]; then
echo 'Please run "create_root_cert_and_key.sh" first, and try again!'
exit;
fi
if [ ! -f v3.ext ]; then
echo 'Please download the "v3.ext" file and try again!'
exit;
fi
# Create a new private key if one doesnt exist, or use the xeisting one if it does
if [ -f device.key ]; then
KEY_OPT="-key"
else
KEY_OPT="-keyout"
fi
DOMAIN=$1
COMMON_NAME=${2:-*.$1}
SUBJECT="/C=CA/ST=None/L=NB/O=None/CN=$COMMON_NAME"
NUM_OF_DAYS=825
openssl req -new -newkey rsa:2048 -sha256 -nodes $KEY_OPT device.key -subj "$SUBJECT" -out device.csr
cat v3.ext | sed s/%%DOMAIN%%/"$COMMON_NAME"/g > /tmp/__v3.ext
openssl x509 -req -in device.csr -CA rootCA.pem -CAkey rootCA.key -CAcreateserial -out device.crt -days $NUM_OF_DAYS -sha256 -extfile /tmp/__v3.ext
# move output files to final filenames
mv device.csr "$DOMAIN.csr"
cp device.crt "$DOMAIN.crt"
# remove temp file
rm -f device.crt;
echo
echo "###########################################################################"
echo Done!
echo "###########################################################################"
echo "To use these files on your server, simply copy both $DOMAIN.csr and"
echo "device.key to your webserver, and use like so (if Apache, for example)"
echo
echo " SSLCertificateFile /path_to_your_files/$DOMAIN.crt"
echo " SSLCertificateKeyFile /path_to_your_files/device.key"
v3.ext
authorityKeyIdentifier=keyid,issuer
basicConstraints=CA:FALSE
keyUsage = digitalSignature, nonRepudiation, keyEncipherment, dataEncipherment
subjectAltName = @alt_names
[alt_names]
DNS.1 = %%DOMAIN%%
One more step - How to make the self signed certs fully trusted in Chrome/Safari
To allow the self signed certificates to be FULLY trusted in Chrome and Safari, you need to import a new certificate authority into your Mac. To do so follow these instructions, or the more detailed instructions on this general process on the mitmproxy website:
You can do this one of 2 ways, at the command line, using this command which will prompt you for your password:
$ sudo security add-trusted-cert -d -r trustRoot -k /Library/Keychains/System.keychain rootCA.pem
or by using the Keychain Access app:
- Open Keychain Access
- Choose "System" in the "Keychains" list
- Choose "Certificates" in the "Category" list
- Choose "File | Import Items..."
- Browse to the file created above, "rootCA.pem", select it, and click "Open"
- Select your newly imported certificate in the "Certificates" list.
- Click the "i" button, or right click on your certificate, and choose "Get Info"
- Expand the "Trust" option
- Change "When using this certificate" to "Always Trust"
- Close the dialog, and you'll be prompted for your password.
- Close and reopen any tabs that are using your target domain, and it'll be loaded securely!
and as a bonus, if you need java clients to trust the certificates, you can do so by importing your certs into the java keystore. Note this will remove the cert from the keystore if it already exists, as it needs to update it in case things change. It of course only does this for the certs being imported.
import_certs_in_current_folder_into_java_keystore.sh
KEYSTORE="$(/usr/libexec/java_home)/jre/lib/security/cacerts";
function running_as_root()
{
if [ "$EUID" -ne 0 ]
then echo "NO"
exit
fi
echo "YES"
}
function import_certs_to_java_keystore
{
for crt in *.crt; do
echo prepping $crt
keytool -delete -storepass changeit -alias alias__${crt} -keystore $KEYSTORE;
keytool -import -file $crt -storepass changeit -noprompt --alias alias__${crt} -keystore $KEYSTORE
echo
done
}
if [ "$(running_as_root)" == "YES" ]
then
import_certs_to_java_keystore
else
echo "This script needs to be run as root!"
fi
net::ERR_CERT_WEAK_SIGNATURE_ALGORITHM. – Seldom 'Where's Monica' Needy