On Thu, Aug 29, 2013 at 04:38:17PM -0700, Erich Weiler wrote:
> I was wondering if there was also a way to quickly create a certificate and
> key file in a similar fashion while also designating SubjAltName options on
> the openssl command line?
The bash script below uses inline command file descriptors <(command),
to dynamically construct an ephemeral openssl config file.
It is a bit rough, since e.g. any non-ecdsa algorithm is assumed
to be RSA, and the ECDSA curve is hard-coded, ... Still you get
the idea.
The output file has correct permissions courtesy of mktemp(1).
Otherwise, you you need to tweak the umask, since openssl's "-out"
option does not disable world/group read on the output file even
when saving private keys.
--
Viktor.
#! /bin/bash
# usage: fqdn out.pem [pkeyalg]
case $3 in
ecdsa)
tmp=$(mktemp "$2.XXXXXX")
openssl req -sha256 -new 2>/dev/null \
-config <(printf "[req]\n%s\n%s\n[dn]\n[exts]\n%s\n[alts]\n%s\n" \
"distinguished_name = dn" \
"x509_extensions = exts" \
"$(printf "%s\n%s\n%s\n%s\n%s" \
"basicConstraints = CA:false" \
"extendedKeyUsage = serverAuth, clientAuth" \
"subjectKeyIdentifier = hash" \
"authorityKeyIdentifier = keyid:always" \
"subjectAltName=@alts")" \
"DNS=$1") \
-newkey param:<(openssl ecparam -name prime256v1) \
-keyout /dev/stdout -nodes \
-x509 -set_serial 1 -days 0 -subj "/" >> "$tmp" &&
mv "$tmp" "$2" ;;
*) tmp=$(mktemp "$2.XXXXXX")
openssl req -sha256 -new 2>/dev/null \
-config <(printf "[req]\n%s\n%s\n[dn]\n[exts]\n%s\n[alts]\n%s\n" \
"distinguished_name = dn" \
"x509_extensions = exts" \
"$(printf "%s\n%s\n%s\n%s\n%s" \
"basicConstraints = CA:false" \
"extendedKeyUsage = serverAuth, clientAuth" \
"subjectKeyIdentifier = hash" \
"authorityKeyIdentifier = keyid:always" \
"subjectAltName=@alts")" \
"DNS=$1") \
-newkey rsa:2048 \
-keyout /dev/stdout -nodes \
-x509 -set_serial 1 -days 0 -subj "/" >> "$tmp" &&
mv "$tmp" "$2" ;;
esac
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