From 537cb1c3cf10ba3552b03c43fb053bde9cca2440 Mon Sep 17 00:00:00 2001
From: "U-Z690-A\\user" <jrayhawk@omgwallhack.org>
Date: Tue, 28 Jun 2022 18:44:57 -0700
Subject: Add automatic extended key usage detection

extendedKeyUsage is needed for some automatic certificate selection on
Windows. We attempt to detect either clientAuth or serverAuth based on
subjAltName and commonName.
---
 configure.sh     |  2 +-
 gensignedcert.sh |  7 ++++---
 signcsr.sh       | 20 +++++++++++++++++---
 3 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/configure.sh b/configure.sh
index 9d9d156..54e9577 100644
--- a/configure.sh
+++ b/configure.sh
@@ -11,7 +11,7 @@ export     CN="Joe Rayhawk" # Common Name
 export      E="jrayhawk+ssl@omgwallhack.org" # Email; used in certs and for From: and CC: in ./mailcert.sh usage
 
 export OPENSSL_CONFIG="openssl.cnf" # For advanced customization (not suggested)
-
+#export EKU="clientAuth, serverAuth" # we try to dynamically determine this in signcsr.sh
 export EMAIL_DEFAULT_DOMAIN="omgwallhack.org" # ./mailcert.sh uses this as a user's domain if nothing more obvious is available
 
 if [ -e ./local.cfg ]; then
diff --git a/gensignedcert.sh b/gensignedcert.sh
index 10c909c..b51f69b 100755
--- a/gensignedcert.sh
+++ b/gensignedcert.sh
@@ -1,6 +1,7 @@
-#!/bin/sh
-# ./keygen [name] (configfile)
+#!/bin/bash
+# ./gensignedcert.sh [name] (configfile)
 # This is only suggested if you have a secured path to deliver this new key through.
+# requires bash 3.0 regexes
 
 set -e
 
@@ -24,7 +25,7 @@ mkdir -pv "$CA"/signed "$CA"/temp "$CA"/certs
 openssl req -config "$OPENSSL_CONFIG" -new -nodes -out "$CA"/temp/"$1".csr -keyout "$CA"/temp/"$1".key
 chmod 600 "$CA"/temp/"$1".key
 SERIAL=$(cat "$CA"/ca/"$CA".serial)
-openssl ca -config "$OPENSSL_CONFIG" -in "$CA"/temp/"$1".csr
+openssl ca -config <( ./ekusub.sh "serverAuth" < "$OPENSSL_CONFIG" ) -in "$CA"/temp/"$1".csr
 if [ -e "$CA"/certs/"$SERIAL".pem ]; then # openssl lacks useful exit status codes, so we check to see if it actually did anything instead.
   mv -i "$CA"/temp/"$1".csr "$CA"/temp/"$1".key "$CA"/signed/
   ln "$CA"/certs/"$SERIAL".pem "$CA"/signed/"$1".crt # so we can find the certificate by name as well as by serial
diff --git a/signcsr.sh b/signcsr.sh
index 4c095f5..910d8d9 100755
--- a/signcsr.sh
+++ b/signcsr.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
-# requires bash regexes
+# requires bash 3.0 regexes
 
 SUPPLEMENTARY_CONFIG="$2"
 
@@ -30,11 +30,25 @@ mkdir -pv "$CA"/signed "$CA"/temp "$CA"/certs
 SERIAL=$(cat "$CA"/ca/"$CA".serial)
 
 if grep ^SPKAC "$1"; then # SPKAC HTML5 <keygen> standard
+  [ -n $EKU ] || EKU="clientAuth" # I don't think servers do SPKACs
   openssl spkac -in "$1" # print key size
-  openssl ca -config "$OPENSSL_CONFIG" -spkac "$1" -notext
+  openssl ca -config <( ./ekusub.sh "$EKU" < $OPENSSL_CONFIG ) -spkac "$1" -notext
 else # x509 CSR
+  if ! [ -n "$EKU" ]; then
+    [[ "$( openssl req -in $1 -subject -nameopt multiline | grep -E '^ +commonName += ' | head -n 1 )" =~ ^\ +commonName\ +=\ (.+)$ ]]
+    CN=${BASH_REMATCH[1]}
+    if openssl req -in "$1" -text | grep -EA1 '^ +X509v3 Subject Alternative Name:' | tail -n 1 | grep -qE '^ +DNS:'; then
+      EKU="serverAuth"
+    elif [[ "$CN" =~ \. ]] && ! [[ "$CN" =~ ' ' ]]; then
+      EKU="serverAuth"
+    elif [[ "$CN" =~ ' ' ]]; then
+      EKU="clientAuth"
+    else
+      echo Unable to determine if client or server for EKU.
+    fi
+  fi
   openssl req -in "$1" -text # print key size
-  openssl ca -config "$OPENSSL_CONFIG" -in "$1" -notext
+  openssl ca -config <( ./ekusub.sh "$EKU" < "$OPENSSL_CONFIG" ) -in "$1" -notext
 fi
 
 if [ -e "$CA"/certs/"$SERIAL".pem ]; then # openssl lacks useful exit status codes, so we check to see if it actually did anything instead.
-- 
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