Wesley van TilburgandClaude Opus 5.5
86039eeb9d
Defender's defaults left behavior monitoring off and every setting unmanaged. Ship /etc/opt/microsoft/mdatp/managed/mdatp_managed.json: real-time protection, behavior monitoring, PUA blocking, cloud-delivered protection at the high block level, automatic definition updates and sample submission, and scheduled scans (daily quick at 12:00, weekly full on Wednesday 12:30, low priority). Users can't change managed settings. The build fails if the file isn't valid JSON. Network protection (Insiders channels only) and tamper protection (audit-only preview on Linux) are left out. The compliance script and rules now also check behavior monitoring and cloud-delivered protection. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
58 lines
2.7 KiB
YAML
58 lines
2.7 KiB
YAML
# Microsoft Defender for Endpoint on Linux (mdatp), Fedora 44 build, from the
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# microsoft-fedora44 repo (repos/microsoft.repo).
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#
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# mdatp's %post does the real install: units, SELinux module, and per-machine
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# state under /var/opt/microsoft/mdatp (machine GUID, definitions database,
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# logs). In a compose /var is read-only, and that state must not be shared
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# between machines anyway, so the %post is saved into the image and run once on
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# first boot by mdatp-firstboot.service. mdatp.service waits for it.
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#
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# Onboarding is per tenant and not part of the image: run the onboarding script
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# from the Defender portal on the device.
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repo-packages:
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- repo: microsoft-fedora44
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packages:
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- mdatp
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packages:
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# The %post is a bash script; Defender's inventory scripts and the
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# onboarding script are Python.
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- bash
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- python3
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add-files:
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- ["mdatp-firstboot", "/usr/libexec/mdatp-firstboot"]
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- ["mdatp-firstboot.service", "/usr/lib/systemd/system/mdatp-firstboot.service"]
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- ["mdatp-firstboot.conf", "/usr/lib/systemd/system/mdatp.service.d/10-firstboot.conf"]
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- ["50-defender.preset", "/usr/lib/systemd/system-preset/50-defender.preset"]
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# Enforced Defender settings (shown as "[managed]" in `mdatp health`; local
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# changes are refused): real-time protection, behavior monitoring, PUA
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# blocking, cloud protection at the "high" block level, automatic updates
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# and sample submission, a daily quick scan at 12:00 and a weekly full scan
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# on Wednesday 12:30 (low priority, up to 2 h later at random). Settings
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# reference: https://learn.microsoft.com/defender-endpoint/linux-preferences
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# Not set here: network protection (Insiders channels only) and tamper
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# protection (audit-only preview on Linux).
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- ["mdatp_managed.json", "/etc/opt/microsoft/mdatp/managed/mdatp_managed.json"]
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postprocess:
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- |
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#!/usr/bin/env bash
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set -xeuo pipefail
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# The %post wrote the units during the compose; fail the build if a newer
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# mdatp stops doing that, rather than shipping a Defender that never starts.
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for unit in mdatp.service mde_netfilter_v2.service mde_netfilter_v2.socket; do
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test -f "/usr/lib/systemd/system/${unit}"
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done
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# rpm-ostree keeps /opt content in /usr/lib/opt until the commit.
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for root in /usr/lib/opt /opt; do
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pp="${root}/microsoft/mdatp/conf/selinux_policies/out/mdatp_service.pp"
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[[ -f "${pp}" ]] && break
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done
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semodule -n -i "${pp}"
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# Fail the build on a typo rather than ship a config Defender can't read.
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python3 -m json.tool /etc/opt/microsoft/mdatp/managed/mdatp_managed.json > /dev/null
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rpm -q --qf '%{POSTIN}' mdatp > /usr/libexec/mdatp-postinst
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chmod 0755 /usr/libexec/mdatp-firstboot /usr/libexec/mdatp-postinst
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