images/fedora-intune/defender.yaml

@@ -34,7 +34,10 @@ add-files:
   # reference: https://learn.microsoft.com/defender-endpoint/linux-preferences
   # Not set here: network protection (Insiders channels only) and tamper
   # protection (audit-only preview on Linux).
-  - ["mdatp_managed.json", "/etc/opt/microsoft/mdatp/managed/mdatp_managed.json"]
+  - ["mdatp_managed.json", "/usr/share/mdatp-managed/mdatp_managed.json"]
+  # Installed into /etc/opt/microsoft/mdatp/managed/ whenever Defender starts;
+  # see the drop-in.
+  - ["mdatp-managed-config.conf", "/usr/lib/systemd/system/mdatp.service.d/20-managed-config.conf"]
 
 postprocess:
   - |
@@ -52,6 +55,6 @@ postprocess:
     done
     semodule -n -i "${pp}"
     # Fail the build on a typo rather than ship a config Defender can't read.
-    python3 -m json.tool /etc/opt/microsoft/mdatp/managed/mdatp_managed.json > /dev/null
+    python3 -m json.tool /usr/share/mdatp-managed/mdatp_managed.json > /dev/null
     rpm -q --qf '%{POSTIN}' mdatp > /usr/libexec/mdatp-postinst
     chmod 0755 /usr/libexec/mdatp-firstboot /usr/libexec/mdatp-postinst

images/fedora-intune/files/himmelblau-os-release

@@ -5,16 +5,23 @@
 # "44". Himmelblau reports VERSION_ID as the device's OS version and has no
 # setting for it. The rest of the system keeps the stock VERSION_ID, which
 # toolbox, flatpak and dnf expect to be the plain release.
+#
+# PRETTY_NAME becomes just NAME: libhimmelblau reports "PRETTY_NAME VERSION_ID"
+# as the OS version string, and Fedora's PRETTY_NAME already contains the
+# version ("Fedora Linux 44.20261020.0 (Forty Four) 44.20261020.0"). Nothing
+# else in Himmelblau reads PRETTY_NAME.
 set -euo pipefail
 
 SRC=/usr/lib/os-release
 DEST=/run/himmelblau-os-release
 
 version="$(. "${SRC}" && echo "${OSTREE_VERSION:-${IMAGE_VERSION:-}}")"
+name="$(. "${SRC}" && echo "${NAME:-Linux}")"
 
 tmp="$(mktemp "${DEST}.XXXXXX")"
 if [[ -n "${version}" ]]; then
-  sed "s/^VERSION_ID=.*/VERSION_ID=${version}/" "${SRC}" > "${tmp}"
+  sed -e "s/^VERSION_ID=.*/VERSION_ID=${version}/" \
+      -e "s/^PRETTY_NAME=.*/PRETTY_NAME=\"${name}\"/" "${SRC}" > "${tmp}"
 else
   # No image version (not an ostree/bootc deployment): pass it through as-is.
   cat "${SRC}" > "${tmp}"

images/fedora-intune/files/mdatp-managed-config.conf

@@ -0,0 +1,7 @@
+# Install the image's enforced Defender settings each time Defender starts.
+# The image can't ship them in /etc directly: mdatp-firstboot creates
+# /etc/opt/microsoft/mdatp on the device, so on updates that directory counts
+# as local and ostree's /etc merge never adds new files under it. Copying on
+# every start also picks up changes from newer images and undoes local edits.
+[Service]
+ExecStartPre=+/usr/bin/install -D -Z -m 0644 /usr/share/mdatp-managed/mdatp_managed.json /etc/opt/microsoft/mdatp/managed/mdatp_managed.json