Configure Yubikey and generate PKCS #11 keys

generate_yubikey_keys.sh

echo "Setting the YubiKey to be a U2F device and behave as a smart card"
ykpersonalize -m 86

if [[ $# -eq 1 ]] && [[ "$1" = "first-run" ]]
then
  echo "Please set a new managment key:"
  yubico-piv-tool -aset-mgm-key || true

  echo "Please set the device PIN:"
  yubico-piv-tool -achange-pin -P123456

  echo "Please set the device PUK:"
  yubico-piv-tool -achange-puk -P12345678
fi

echo "Please confirm the PIN is set correctly:"
pkcs15-tool --verify-pin

echo "Gnenerating RSA keypair..."
yubico-piv-tool -s 9a -a generate -k --pin-policy=once --touch-policy=always --algorithm=RSA2048 -o public.pem

echo "Please touch the device."

echo "Generating self-signed SSH key..."
yubico-piv-tool -a verify-pin -a selfsign-certificate -s 9a -S '/CN=ssh/' --valid-days=365 -i public.pem -o cert.pem

echo "Importing self-signed key..."
yubico-piv-tool -k -a import-certificate -s 9a -i cert.pem

echo "Exporting public key for PKCS#11..."
ssh-keygen -D /usr/local/opt/opensc/lib/pkcs11/opensc-pkcs11.so -e

echo "Exporting public key..."
ssh-keygen -i -m PKCS8 -f public.pem

echo "Please confirm the public key status:"
yubico-piv-tool -a status

# https://github.com/Yubico/yubico-piv-tool/issues/118
cp /usr/local/lib/libykcs11.dylib /usr/local/lib/libykcs11_NOTALINK.dylib
ssh-add -s /usr/local/lib/libykcs11_NOTALINK.dylib

echo "Please confirm the key has been added to SSH:"
ssh-add -L

GITHUB_USERNAME=$(git config --get github.user)
echo "You can now add the following to ~/.ssh/config:"
echo <<- EOF
Host github.com
PKCS11Provider /usr/local/opt/opensc/lib/pkcs11/opensc-pkcs11.so
Port 22
User $GITHUB_USERNAME
EOF