pki: make certificates only readable to group and others

even though we copy these to hosts it's not a good idea to allow them to
be overwritten by a random user. Openssl database files are also always
recreated, umask should take care of all of that.
Ansible does not use default umask from OS so we need to explicitly set
it. We can use login shell to figure out the effective command-line umask
value.

packaging/bin/pki-enroll-openssh-cert.sh

@@ -32,6 +32,7 @@ sign() {
 		}
 		trap cleanup 0
 		cat "${PKIDIR}/private/ca.pem" > "${TMPCA}"
+        umask "$(/bin/sh -l -c umask)"
 		ssh-keygen \
 			-s "${TMPCA}" \
 			-P "" \

packaging/bin/pki-enroll-request.sh

@@ -22,6 +22,7 @@ sign() {
 		[ -e "${CERT_CONF}" ] || die "${CERT_CONF} is missing, Cannot sign certificate"
 		EXTRA_COMMAND="-extfile ${CERT_CONF} -extensions ${extsection}"
 	fi
+    umask "$(/bin/sh -l -c umask)"
 	OVIRT_KU="${ovirt_ku}" OVIRT_EKU="${ovirt_eku}" OVIRT_SAN="${ovirt_san}" \
 		openssl ca \
 		-batch \