From 62e16d334bdca467db766dac11c17aa9f002ddea Mon Sep 17 00:00:00 2001
From: Max <msuraev@sysmocom.de>
Date: Wed, 12 Oct 2022 16:15:25 +0300
Subject: .deb/.rpm: add osmocom user during package install

Created osmocom user & group during package installation.
Fix the configuration dir/files permission to match.

Related: OS#4107
Tweaked-By: Oliver Smith <osmith@sysmocom.de>
Change-Id: I41d47c0884d09d4674ec806d77e43bc8f08d9b64
---
 contrib/osmo-msc.spec.in         | 15 ++++++++++++++-
 contrib/systemd/osmo-msc.service |  2 ++
 debian/control                   |  2 +-
 debian/postinst                  | 39 +++++++++++++++++++++++++++++++++++++++
 4 files changed, 56 insertions(+), 2 deletions(-)
 create mode 100755 debian/postinst

diff --git a/contrib/osmo-msc.spec.in b/contrib/osmo-msc.spec.in
index de9314926..e6e323ae4 100644
--- a/contrib/osmo-msc.spec.in
+++ b/contrib/osmo-msc.spec.in
@@ -85,19 +85,32 @@ make %{?_smp_mflags}
 %install
 %make_install
 
-%if 0%{?suse_version}
 %preun
+%if 0%{?suse_version}
 %service_del_preun %{name}.service
+%endif
 
 %postun
+%if 0%{?suse_version}
 %service_del_postun %{name}.service
+%endif
 
 %pre
+getent group osmocom >/dev/null || groupadd --system osmocom
+getent passwd osmocom >/dev/null || useradd --system --gid osmocom --home-dir /var/lib/osmocom \
+                                            --shell /sbin/nologin --comment "Open Source Mobile Communications" osmocom
+%if 0%{?suse_version}
 %service_add_pre %{name}.service
+%endif
 
 %post
+%if 0%{?suse_version}
 %service_add_post %{name}.service
 %endif
+chown osmocom:osmocom /etc/osmocom/osmo-msc.cfg
+chmod 0660 /etc/osmocom/osmo-msc.cfg
+chown root:osmocom /etc/osmocom
+chmod 2775 /etc/osmocom
 
 %check
 make %{?_smp_mflags} check || (find . -name testsuite.log -exec cat {} +)
diff --git a/contrib/systemd/osmo-msc.service b/contrib/systemd/osmo-msc.service
index f21aec7b5..f0e18e647 100644
--- a/contrib/systemd/osmo-msc.service
+++ b/contrib/systemd/osmo-msc.service
@@ -12,6 +12,8 @@ Type=simple
 Restart=always
 StateDirectory=osmocom
 WorkingDirectory=%S/osmocom
+User=osmocom
+Group=osmocom
 ExecStart=/usr/bin/osmo-msc -c /etc/osmocom/osmo-msc.cfg
 RestartSec=2
 
diff --git a/debian/control b/debian/control
index 64bb73c90..00c1b267a 100644
--- a/debian/control
+++ b/debian/control
@@ -31,7 +31,7 @@ Homepage: https://osmocom.org/projects/osmomsc
 Package: osmo-msc
 Architecture: any
 Multi-Arch: foreign
-Depends: ${misc:Depends}, ${shlibs:Depends}
+Depends: ${misc:Depends}, ${shlibs:Depends}, adduser
 Recommends: osmo-mgw
 Description: OsmoMSC: Osmocom's Mobile Switching Center for 2G and 3G circuit-switched mobile networks
   The Mobile Switching Center (MSC) is the heart of 2G/3G
diff --git a/debian/postinst b/debian/postinst
new file mode 100755
index 000000000..866c31a48
--- /dev/null
+++ b/debian/postinst
@@ -0,0 +1,39 @@
+#!/bin/sh -e
+# Create 'osmocom' user and group (if it doesn't exist yet) and adjust permissions
+# of directories which are not automatically adjusted by systemd from previous (root-owned)
+# install.
+
+# N. B: the user is intentionally NOT removed during package uninstall:
+# see https://wiki.debian.org/AccountHandlingInMaintainerScripts for reasoning.
+chperms() {
+	# chperms <user> <group> <perms> <file>
+	if ! OVERRIDE=`dpkg-statoverride --list $4 2>&1`; then
+		if [ -e $4 ]; then
+			chown $1:$2 $4
+			chmod $3 $4
+		fi
+	fi
+}
+
+case "$1" in
+  configure)
+    if ! getent passwd osmocom > /dev/null; then
+        adduser --quiet \
+                --system \
+                --group \
+                --no-create-home \
+                --disabled-password \
+                --home /var/lib/osmocom \
+                --gecos "Open Source Mobile Communications" \
+                osmocom
+    fi
+# Set permissions according to https://www.debian.org/doc/debian-policy/ch-files.html#s-permissions-owners
+    chperms osmocom osmocom 0660 /etc/osmocom/osmo-msc.cfg
+    chperms root osmocom 2775 /etc/osmocom
+
+  ;;
+esac
+
+# dh_installdeb(1) will replace this with shell code automatically
+# generated by other debhelper scripts.
+#DEBHELPER#
-- 
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