Generate an x509 certificate and a TLSA record with openssl

x509-dane.md

Creating a self-signed certificate for example.com (if you already have a certificate you can skip this step):

openssl req -x509 -newkey rsa:4096 -sha256 -days 365 -nodes \
  -keyout cert.key -out cert.crt -extensions ext  -config \
  <(echo "[req]"; 
    echo distinguished_name=req; 
    echo "[ext]";
    echo "keyUsage=critical,digitalSignature,keyEncipherment";
    echo "extendedKeyUsage=serverAuth";
    echo "basicConstraints=critical,CA:FALSE";
    echo "subjectAltName=DNS:example.com,DNS:*.example.com";
    ) -subj "/CN=*.example.com"

Generate the TLSA record rdata (you can also use this tool):

echo -n "3 1 1 " && openssl x509 -in cert.crt -pubkey -noout | openssl pkey -pubin -outform der | openssl dgst -sha256 -binary | xxd  -p -u -c 32

Add the TLSA record to your zone file

To get the TLSA record of a remote host (updated):

echo -n "3 1 1 " && openssl s_client -connect 157.245.63.29:443 -servername letsdane <<< "Q" 2>/dev/null | openssl x509 -pubkey -noout -in /dev/stdin | openssl pkey -pubin -outform der | openssl dgst -sha256 -binary | xxd -p -u -c 32

• add -in /dev/stdin to remove openssl's new warning that reads Warning: Reading certificate from stdin since no -in or -new option is given
• add <<< "Q" so the connection is quit automaticlly without a ctrl+C
• optionally separate out IP with -servername