/usr/share/easy-rsa/build-key-server is in easy-rsa 2.2.2-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | #!/bin/sh
# Make a certificate/private key pair using a locally generated
# root certificate.
#
# Explicitly set nsCertType to server using the "server"
# extension in the openssl.cnf file.
export EASY_RSA="${EASY_RSA:-.}"
"$EASY_RSA/pkitool" --interact --server $*
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