[PATCH v2 1/3] add ECDSA key generation to httpscert

["Peter Müller" <peter.mueller@link38.eu>]

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Add ECDSA server certificate and key generation to httpscert.
The key has a length of 384 bits, which equals > 4096 bits RSA
and should be sufficient.

Changed since v1: Do not regenerate or oversign existing keys
or CSRs.

This patch depends on:
- v1 2/3 add ECDSA certificate and key files to Apache configuration
- v2 3/3 generate ECDSA certificate and key on existing installations

Signed-off-by: Peter Müller <peter.mueller(a)link38.eu>
---
diff --git a/src/scripts/httpscert b/src/scripts/httpscert
index e20f789ed..52932bc70 100644
--- a/src/scripts/httpscert
+++ b/src/scripts/httpscert
@@ -7,16 +7,35 @@
 case "$1" in
   new)
        if [ ! -f /etc/httpd/server.key ]; then
-               echo "Generating https server key."
+               echo "Generating HTTPS RSA server key."
                /usr/bin/openssl genrsa -out /etc/httpd/server.key 4096
        fi
-       echo "Generating CSR"
-       /bin/cat /etc/certparams | sed "s/HOSTNAME/`hostname -f`/" | /usr/bin/openssl \
-               req -new -key /etc/httpd/server.key -out /etc/httpd/server.csr
-       echo "Signing certificate"
-       /usr/bin/openssl x509 -req -days 999999 -sha256 -in \
-               /etc/httpd/server.csr -signkey /etc/httpd/server.key -out \
-               /etc/httpd/server.crt
+       if [ ! -f /etc/httpd/server-ecdsa.key ]; then
+               echo "Generating HTTPS ECDSA server key."
+               /usr/bin/openssl ecparam -genkey -name secp384r1 | openssl ec -out /etc/httpd/server-ecdsa.key
+       fi
+
+       echo "Generating CSRs"
+       if [ ! -f /etc/httpd/server.csr ]; then
+               /bin/cat /etc/certparams | sed "s/HOSTNAME/`hostname -f`/" | /usr/bin/openssl \
+                       req -new -key /etc/httpd/server.key -out /etc/httpd/server.csr
+       fi
+       if [ ! -f /etc/httpd/server-ecdsa.csr ]; then
+               /bin/cat /etc/certparams | sed "s/HOSTNAME/`hostname -f`/" | /usr/bin/openssl \
+                       req -new -key /etc/httpd/server-ecdsa.key -out /etc/httpd/server-ecdsa.csr
+       fi
+
+       echo "Signing certificates"
+       if [ ! -f /etc/httpd/server.crt ]; then
+               /usr/bin/openssl x509 -req -days 999999 -sha256 -in \
+                       /etc/httpd/server.csr -signkey /etc/httpd/server.key -out \
+                       /etc/httpd/server.crt
+       fi
+       if [ ! -f /etc/httpd/server-ecdsa.crt ]; then
+               /usr/bin/openssl x509 -req -days 999999 -sha256 -in \
+                       /etc/httpd/server-ecdsa.csr -signkey /etc/httpd/server-ecdsa.key -out \
+                       /etc/httpd/server-ecdsa.crt
+       fi
        ;;
   read)
        if [ -f /etc/httpd/server.key -a -f /etc/httpd/server.crt -a -f /etc/httpd/server.csr ]; then