In progress, broken.

lib/systemd/system/vm-sudo-protect.service

@@ -5,6 +5,8 @@ Before=qubes-mount-dirs.service
 ConditionPathExists=|/var/run/qubes-service/vm-sudo-protect
 ConditionPathExists=|/var/run/qubes-service/vm-sudo-protect-root
 DefaultDependencies=false
+#OnFailure=shutdown.target
+#OnFailureJobMode=replace-irreversibly
 
 [Service]
 Type=oneshot

usr/lib/qubes/init/vm-sudo-protect.sh

@@ -1,7 +1,11 @@
 #!/bin/sh
 
-## Protect startup of Qubes VMs from /rw scripts  ##
-## https://github.com/tasket/Qubes-VM-hardening   ##
+## Protect startup of Qubes VMs from /rw scripts    ##
+## https://github.com/tasket/Qubes-VM-hardening     ##
+
+
+# Source Qubes library.
+. /usr/lib/qubes/init/functions
 
 # Define sh, bash, X and desktop init scripts
 # to be protected
@@ -10,42 +14,92 @@ chfiles=".bashrc .bash_profile .bash_login .bash_logout .profile \
 chdirs=".config/autostart .config/plasma-workspace/env .config/plasma-workspace/shutdown \
 .config/autostart-scripts"
 
+# Make user scripts immutable:
+make_immutable() {
+    cd $rw/home/user
+    mkdir -p $chdirs
+    touch $chfiles
+    chattr -R -f +i $chfiles $chdirs
+    touch $rw/home/user/FIXED
+}
+
+# Mount private volume in temp location
 rw=/mnt/rwtmp
 mkdir -p $rw
 if [ -e /dev/xvdb ] && mount /dev/xvdb $rw ; then
-  echo Good rw mount.
+    echo Good rw mount.
 else
-  exit 0
+    exit 0
 fi
 
-# Experimental: Remove /rw root startup files and copy defaults.
+# Protection measures for /rw dirs:
 # Activated by presence of vm-sudo-protect-root Qubes service.
-# Contents of vms/vms.all and vms/hostname will be copied.
+#   * Hashes in vms/vms.all.SHA and vms/$HOSTNAME.SHA files will be checked.
+#   * Remove /rw root startup files.
+#   * Contents of vms/vms.all and vms/$HOSTNAME folders will be copied.
 defdir="/etc/default/vms"
 rootdirs="$rw/config $rw/usrlocal $rw/bind-dirs"
+HOSTNAME=`hostname`
+
+if qsvc vm-sudo-protect-root && is_rwonly_persistent; then
+
+    # Check hashes
+    checkcode=0
+    echo "File hash checks:" >/tmp/vm-protect-sum-error
+    for vmset in vms.all $HOSTNAME; do
+        if [ -f $defdir/$vmset.SHA ]; then
+            sha256sum --strict -c $defdir/$vmset.SHA &>>/tmp/vm-protect-sum-error
+            checkcode=$((checkcode+$?))
+        fi
+    done
+    # Stop system startup if checksum mismatched
+    if [ $checkcode != 0 ]; then
+        cat /tmp/vm-protect-sum-error # For logging
+        xterm -hold -display :0 -title "VM PROTECTION: CHECKSUM MISMATCH!" \
+-e "cat /tmp/vm-protect-sum-error; echo Private volume is mounted at $rw; bash -i"
+        exit 1
+    fi
+
+
+
+
+    # Make user scripts temporarily mutable, in case 'rw/home/user'
+    # files exist in defdir -- Copy default files
+    cd $rw/home/user
+    chattr -R -f -i $chfiles $chdirs
+
+    # Deactivate config dirs
+    for dir in $rootdirs; do
+        if [ -d $dir ]; then
+            chattr -R -f -i $dir
+            cp -a --link $dir $dir-BAK
+#            rm -rf $dir-BAK
+#            mv $dir $dir-BAK
+            find $dir -type f | cat - $defdir/$HOSTNAME.whitelist $defdir/vms.all.whitelist \
+| sed -r "s|^\ */rw(.+)\ *$|$rw\1|" | sort | uniq -u | xargs -I fpath rm -f "fpath"
+        fi
+
+        for vmset in vms.all $HOSTNAME; do
+            # Process whitelists -- FIX FIX FIX
+            while false; do
+#            while read srcfile; do
+                if [[ $srcfile =~ ^$dir\/ ]]; then
+                    cp -a --link --parents `sed -r "s|^/rw/|$rw/BAK-|" <<<$srcfile` /
+                else
+                    echo "Cannot use relative or non-rw whitelist path."
+                fi
+            done <$defdir/$vmset.whitelist
+
+            # Copy default files
+            if [ -d $defdir/$vmset ]; then
+                cp -af $defdir/$vmset/* /
+            fi
+        done
+    done
 
-if [ -e /var/run/qubes-service/vm-sudo-protect-root ] \
-&& [ `qubesdb-read /qubes-vm-persistence` = "rw-only" ]; then
-  rm -rf $rootdirs
-  # make user scripts temporarily mutable, in case 'rw/home/user'
-  # files exist in defdir...
-  cd $rw/home/user
-  chattr -R -f -i $chfiles $chdirs || true
-  # copy..
-  if [ -d $defdir/vms.all ]; then
-    cp -af $defdir/vms.all/* / || true
-  fi
-  if [ -d $defdir/$(hostname) ]; then
-    cp -af $defdir/$(hostname)/* / || true
-  fi
 fi
 
-# Make user scripts immutable
-cd $rw/home/user
-mkdir -p $chdirs ||true
-touch $chfiles || true
-chattr -R -f +i $chfiles $chdirs || true
-touch $rw/home/user/FIXED || true
-
+make_immutable
 cd /
 umount $rw && rmdir $rw
+exit 0