HPKP with letsencrypt and nginx

Get SPKI-hash

Let’s Encrypt Authority X4

curl https://letsencrypt.org/certs/lets-encrypt-x4-cross-signed.pem | openssl x509 -pubkey | openssl pkey -pubin -outform der | openssl dgst -sha256 -binary | base64

Let’s Encrypt Authority X3

curl https://letsencrypt.org/certs/lets-encrypt-x3-cross-signed.pem | openssl x509 -pubkey | openssl pkey -pubin -outform der | openssl dgst -sha256 -binary | base64

ISRG Root X1

curl https://letsencrypt.org/certs/isrgrootx1.pem | openssl x509 -pubkey | openssl pkey -pubin -outform der | openssl dgst -sha256 -binary | base64

Add config to nginx

add_header Public-Key-Pins 'pin-sha256="X4-Hash"; pin-sha256="X3-Hash"; pin-sha256="X1-Hash"; max-age=15768000;';

Reload nginx

nginx -s reload

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Kawin Viriyaprasopsook

System administrator at Zercle Technology Co., Ltd.

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