debian authentic2-multitenant: generate secret key

debian-wheezy/authentic2-multitenant.postinst

@@ -9,6 +9,7 @@ NAME=authentic2-multitenant
 AUTHENTIC_USER=authentic-multitenant
 AUTHENTIC_GROUP=authentic-multitenant
 AUTHENTIC_HOME=/var/lib/$NAME
+AUTHENTIC_SECRET_KEY="/etc/$NAME/secret"
 
 case "$1" in
     configure)
@@ -25,6 +26,12 @@ case "$1" in
                     $AUTHENTIC_USER
             echo "..done" >&2
         fi
+        if [ ! -f $AUTHENTIC_SECRET_KEY ]; then
+            echo -n "Generating a secret key.." >&2
+            echo -n "`</dev/urandom tr -dc [:alnum:]-_\!\%\^:\; | head -c70`" > "$AUTHENTIC_SECRET_KEY"
+            chmod 0600 $AUTHENTIC_SECRET_KEY
+            echo "..done" >&2
+        fi
 
         chown $AUTHENTIC_USER:$AUTHENTIC_GROUP $AUTHENTIC_HOME/tenants \
             /var/lib/$NAME/collected-static \