OpenSSL Makefile configuration example for CentOS Linux 6

Get the default configuration file Makefile for OpenSSL, optimized for CentOS Linux 6. This example configuration ensures optimal compatibility and performance for OpenSSL, making it easy to set up and adjust to meet your needs.

Find and download the configuration file here: /etc/pki/tls/certs/Makefile.

For more configurations and setup guides, visit our related files section to further customize your system.

    UTF8 := $(shell locale -c LC_CTYPE -k | grep -q charmap.*UTF-8 && echo -utf8)
SERIAL=0

.PHONY: usage
.SUFFIXES: .key .csr .crt .pem
.PRECIOUS: %.key %.csr %.crt %.pem

usage:
	@echo "This makefile allows you to create:"
	@echo "  o public/private key pairs"
	@echo "  o SSL certificate signing requests (CSRs)"
	@echo "  o self-signed SSL test certificates"
	@echo
	@echo "To create a key pair, run \"make SOMETHING.key\"."
	@echo "To create a CSR, run \"make SOMETHING.csr\"."
	@echo "To create a test certificate, run \"make SOMETHING.crt\"."
	@echo "To create a key and a test certificate in one file, run \"make SOMETHING.pem\"."
	@echo
	@echo "To create a key for use with Apache, run \"make genkey\"."
	@echo "To create a CSR for use with Apache, run \"make certreq\"."
	@echo "To create a test certificate for use with Apache, run \"make testcert\"."
	@echo
	@echo "To create a test certificate with serial number other than zero, add SERIAL=num"
	@echo
	@echo Examples:
	@echo "  make server.key"
	@echo "  make server.csr"
	@echo "  make server.crt"
	@echo "  make stunnel.pem"
	@echo "  make genkey"
	@echo "  make certreq"
	@echo "  make testcert"
	@echo "  make server.crt SERIAL=1"
	@echo "  make stunnel.pem SERIAL=2"
	@echo "  make testcert SERIAL=3"

%.pem:
	umask 77 ; \
	PEM1=`/bin/mktemp /tmp/openssl.XXXXXX` ; \
	PEM2=`/bin/mktemp /tmp/openssl.XXXXXX` ; \
	/usr/bin/openssl req $(UTF8) -newkey rsa:2048 -keyout $$PEM1 -nodes -x509 -days 365 -out $$PEM2 -set_serial $(SERIAL) ; \
	cat $$PEM1 >  $@ ; \
	echo ""    >> $@ ; \
	cat $$PEM2 >> $@ ; \
	$(RM) $$PEM1 $$PEM2

%.key:
	umask 77 ; \
	/usr/bin/openssl genrsa -aes128 2048 > $@

%.csr: %.key
	umask 77 ; \
	/usr/bin/openssl req $(UTF8) -new -key $^ -out $@

%.crt: %.key
	umask 77 ; \
	/usr/bin/openssl req $(UTF8) -new -key $^ -x509 -days 365 -out $@ -set_serial $(SERIAL)

TLSROOT=/etc/pki/tls
KEY=$(TLSROOT)/private/localhost.key
CSR=$(TLSROOT)/certs/localhost.csr
CRT=$(TLSROOT)/certs/localhost.crt

genkey: $(KEY)
certreq: $(CSR)
testcert: $(CRT)

$(CSR): $(KEY)
	umask 77 ; \
	/usr/bin/openssl req $(UTF8) -new -key $(KEY) -out $(CSR)

$(CRT): $(KEY)
	umask 77 ; \
	/usr/bin/openssl req $(UTF8) -new -key $(KEY) -x509 -days 365 -out $(CRT) -set_serial $(SERIAL)

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