Use dedicated system users for internal components.

  * The internal webserver now runs as a dedicated system user _lacme-www
    (and group nogroup) instead of www-data:www-data.  This is configurable
    in the [webserver] section of the lacme(8) configuration file.
  * The internal ACME client now runs as a dedicated system user _lacme-client
    (and group nogroup) instead of nobody:nogroup.  This is configurable in
    the [client] section of the lacme(8) configuration file.
  * The _lacme-www and _lacme-client system users are created automatically by
    lacme.postinst (hence a new Depends: adduser), and deleted on purge.  (So
    make sure not to chown any file to these internal users.)

1 files changed, 21 insertions, 0 deletions

diff --git a/debian/lacme.postinst b/debian/lacme.postinst
new file mode 100755
index 0000000..536e37f
--- /dev/null
+++ b/debian/lacme.postinst
@@ -0,0 +1,21 @@
+#!/bin/sh
+
+set -e
+
+if [ "$1" = "configure" ]; then
+    if ! getent passwd _lacme-www >/dev/null; then
+	    adduser --force-badname --system \
+            --home /nonexistent --no-create-home \
+            --gecos "lacme www user" \
+            --quiet _lacme-www || true
+    fi
+    if ! getent passwd _lacme-client >/dev/null; then
+	    adduser --force-badname --system \
+            --home /nonexistent --no-create-home \
+            --gecos "lacme client user" \
+            --quiet _lacme-client || true
+    fi
+fi
+
+#DEBHELPER#
+exit 0