OpenSSL CA configuration example for CentOS Linux 7

Get the default configuration file CA for OpenSSL, optimized for CentOS Linux 7. 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/misc/CA.

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

    #!/bin/sh
#
# CA - wrapper around ca to make it easier to use ... basically ca requires
#      some setup stuff to be done before you can use it and this makes
#      things easier between now and when Eric is convinced to fix it :-)
#
# CA -newca ... will setup the right stuff
# CA -newreq ... will generate a certificate request
# CA -sign ... will sign the generated request and output
#
# At the end of that grab newreq.pem and newcert.pem (one has the key
# and the other the certificate) and cat them together and that is what
# you want/need ... I'll make even this a little cleaner later.
#
#
# 12-Jan-96 tjh    Added more things ... including CA -signcert which
#                  converts a certificate to a request and then signs it.
# 10-Jan-96 eay    Fixed a few more bugs and added the SSLEAY_CONFIG
#                  environment variable so this can be driven from
#                  a script.
# 25-Jul-96 eay    Cleaned up filenames some more.
# 11-Jun-96 eay    Fixed a few filename missmatches.
# 03-May-96 eay    Modified to use 'ssleay cmd' instead of 'cmd'.
# 18-Apr-96 tjh    Original hacking
#
# Tim Hudson
# tjh@cryptsoft.com
#

# default openssl.cnf file has setup as per the following
# demoCA ... where everything is stored
cp_pem() {
    infile=$1
    outfile=$2
    bound=$3
    flag=0
    exec <$infile;
    while read line; do
	if [ $flag -eq 1 ]; then
		echo $line|grep "^-----END.*$bound"  2>/dev/null 1>/dev/null
		if [ $? -eq 0 ] ; then
			echo $line >>$outfile
			break
		else
			echo $line >>$outfile
		fi
	fi

	echo $line|grep "^-----BEGIN.*$bound"  2>/dev/null 1>/dev/null
	if [ $? -eq 0 ]; then
		echo $line >$outfile
		flag=1
	fi
    done
}

usage() {
 echo "usage: $0 -newcert|-newreq|-newreq-nodes|-newca|-sign|-verify" >&2
}

if [ -z "$OPENSSL" ]; then OPENSSL=openssl; fi

if [ -z "$DAYS" ] ; then DAYS="-days 365" ; fi	# 1 year
CADAYS="-days 1095"	# 3 years
REQ="$OPENSSL req $SSLEAY_CONFIG"
CA="$OPENSSL ca $SSLEAY_CONFIG"
VERIFY="$OPENSSL verify"
X509="$OPENSSL x509"
PKCS12="openssl pkcs12"

if [ -z "$CATOP" ] ; then CATOP=/etc/pki/CA ; fi
CAKEY=./cakey.pem
CAREQ=./careq.pem
CACERT=./cacert.pem

RET=0

while [ "$1" != "" ] ; do
case $1 in
-\?|-h|-help)
    usage
    exit 0
    ;;
-newcert)
    # create a certificate
    $REQ -new -x509 -keyout newkey.pem -out newcert.pem $DAYS
    RET=$?
    echo "Certificate is in newcert.pem, private key is in newkey.pem"
    ;;
-newreq)
    # create a certificate request
    $REQ -new -keyout newkey.pem -out newreq.pem $DAYS
    RET=$?
    echo "Request is in newreq.pem, private key is in newkey.pem"
    ;;
-newreq-nodes) 
    # create a certificate request
    $REQ -new -nodes -keyout newreq.pem -out newreq.pem $DAYS
    RET=$?
    echo "Request (and private key) is in newreq.pem"
    ;;
-newca)
    # if explicitly asked for or it doesn't exist then setup the directory
    # structure that Eric likes to manage things
    NEW="1"
    if [ "$NEW" -o ! -f ${CATOP}/serial ]; then
	# create the directory hierarchy
	mkdir -p ${CATOP}
	mkdir -p ${CATOP}/certs
	mkdir -p ${CATOP}/crl
	mkdir -p ${CATOP}/newcerts
	mkdir -p ${CATOP}/private
	touch ${CATOP}/index.txt
    fi
    if [ ! -f ${CATOP}/private/$CAKEY ]; then
	echo "CA certificate filename (or enter to create)"
	read FILE

	# ask user for existing CA certificate
	if [ "$FILE" ]; then
	    cp_pem $FILE ${CATOP}/private/$CAKEY PRIVATE
	    cp_pem $FILE ${CATOP}/$CACERT CERTIFICATE
	    RET=$?
	    if [ ! -f "${CATOP}/serial" ]; then
		$X509 -in ${CATOP}/$CACERT -noout -next_serial \
		      -out ${CATOP}/serial
	    fi
	else
	    echo "Making CA certificate ..."
	    $REQ -new -keyout ${CATOP}/private/$CAKEY \
			   -out ${CATOP}/$CAREQ
	    $CA -create_serial -out ${CATOP}/$CACERT $CADAYS -batch \
			   -keyfile ${CATOP}/private/$CAKEY -selfsign \
			   -extensions v3_ca \
			   -infiles ${CATOP}/$CAREQ
	    RET=$?
	fi
    fi
    ;;
-xsign)
    $CA -policy policy_anything -infiles newreq.pem
    RET=$?
    ;;
-pkcs12)
    if [ -z "$2" ] ; then
	CNAME="My Certificate"
    else
	CNAME="$2"
    fi
    $PKCS12 -in newcert.pem -inkey newreq.pem -certfile ${CATOP}/$CACERT \
	    -out newcert.p12 -export -name "$CNAME"
    RET=$?
    exit $RET
    ;;
-sign|-signreq)
    $CA -policy policy_anything -out newcert.pem -infiles newreq.pem
    RET=$?
    cat newcert.pem
    echo "Signed certificate is in newcert.pem"
    ;;
-signCA)
    $CA -policy policy_anything -out newcert.pem -extensions v3_ca -infiles newreq.pem
    RET=$?
    echo "Signed CA certificate is in newcert.pem"
    ;;
-signcert)
    echo "Cert passphrase will be requested twice - bug?"
    $X509 -x509toreq -in newreq.pem -signkey newreq.pem -out tmp.pem
    $CA -policy policy_anything -out newcert.pem -infiles tmp.pem
    RET=$?
    cat newcert.pem
    echo "Signed certificate is in newcert.pem"
    ;;
-verify)
    shift
    if [ -z "$1" ]; then
	    $VERIFY -CAfile $CATOP/$CACERT newcert.pem
	    RET=$?
    else
	for j
	do
	    $VERIFY -CAfile $CATOP/$CACERT $j
	    if [ $? != 0 ]; then
		    RET=$?
	    fi
	done
    fi
    exit $RET
    ;;
*)
    echo "Unknown arg $i" >&2
    usage
    exit 1
    ;;
esac
shift
done
exit $RET

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