Easily create local SSL certificates for development sites that work with you own Certificate Authority https://deliciousbrains.com/ssl-certificate-authority-for-local-https-development/

ssl.sh

#!/bin/sh

if [ "$#" -ne 1 ]
then
  echo "Usage: Must supply a domain"
  exit 1
fi

DOMAIN=$1

cd ~/certs

openssl genrsa -out $DOMAIN.key 2048
openssl req -new -key $DOMAIN.key -out $DOMAIN.csr

cat > $DOMAIN.ext << EOF
authorityKeyIdentifier=keyid,issuer
basicConstraints=CA:FALSE
keyUsage = digitalSignature, nonRepudiation, keyEncipherment, dataEncipherment
subjectAltName = @alt_names

[alt_names]
DNS.1 = $DOMAIN
DNS.2 = $DOMAIN.192.168.1.19.xip.io
EOF

openssl x509 -req -in $DOMAIN.csr -CA ../myCA.pem -CAkey ../myCA.key -CAcreateserial \
-out $DOMAIN.crt -days 1825 -sha256 -extfile $DOMAIN.ext

Original Gist: https://gist.github.com/polevaultweb/c83ac276f51a523a80d8e7f9a61afad0

I use this for adding certificates to local sites with MAMP Pro

1. Create your own Certificate Authority https://deliciousbrains.com/ssl-certificate-authority-for-local-https-development/
2. Create a directory certs in your root directory
3. Download this bash file to your root
4. Copy the file to /usr/local/bin/: mv ssl.sh /usr/local/bin/ssl
5. Make it executable chmod u+x /usr/local/bin/ssl
6. Call it anywhere like ssl mydomain.dev (follow the prompts as per https://deliciousbrains.com/ssl-certificate-authority-for-local-https-development/#creating-ca-signed-certificates)
7. Add the cert to your host in MAMP Pro