diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index f75794a..997a02c 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -20,7 +20,7 @@ jobs:
         name: Full
         strategy:
             matrix:
-                platform: [centos7, centos8, debian10, debian8, debian9, opensuse150, opensuse151, opensuse152, ubuntu1404, ubuntu1604, ubuntu1804, ubuntu2004]
+                platform: ['centos7@centos:7.7.1908', 'centos7@centos:7.8.2003', 'centos7@centos:7.9.2009', 'centos8@centos:8.1.1911', 'centos8@centos:8.2.2004', 'centos8@centos:8.3.2011', debian10, debian8, debian9, opensuse150, opensuse151, opensuse152, ubuntu1404, ubuntu1604, ubuntu1804, ubuntu2004]
         runs-on: ubuntu-latest
         if: contains(github.event.pull_request.labels.*.name, 'tests:full')
         steps:
diff --git a/README.md b/README.md
index 518d65a..19744c5 100644
--- a/README.md
+++ b/README.md
@@ -73,7 +73,7 @@ Also don't forget to customize your `bastion.conf` file, which can be found in `
 Linux distros below are tested with each release, but as this is a security product, you are **warmly** advised to run it on the latest up-to-date stable version of your favorite OS:
 
 - Debian 10 (Buster), 9 (Stretch), 8 (Jessie)
-- RHEL/CentOS 8, 7
+- RHEL/CentOS 8.x (8.3.2011, 8.2.2004, 8.1.1911), 7.x (7.9.2009, 7.8.2003, 7.7.1908)
 - Ubuntu LTS 20.04, 18.04, 16.04, 14.04\*
 - OpenSUSE Leap 15.2\*, 15.1\*, 15.0\*
 
diff --git a/bin/admin/packages-check.sh b/bin/admin/packages-check.sh
index 3bdc70a..97cfa21 100755
--- a/bin/admin/packages-check.sh
+++ b/bin/admin/packages-check.sh
@@ -69,12 +69,12 @@ if echo "$DISTRO_LIKE" | grep -q -w debian; then
     install_cmd="apt-get install"
 elif echo "$DISTRO_LIKE" | grep -q -w rhel; then
     wanted_list="perl-JSON perl-Net-Netmask perl-Net-IP \
-            perl-Net-DNS perl-DBD-SQLite perl-TermReadKey perl-DateTime \
-            sudo fping xz sqlite binutils acl perl-TimeDate gnupg rsync \
+            perl-Net-DNS perl-DBD-SQLite perl-TermReadKey \
+            sudo fping xz sqlite binutils acl gnupg rsync \
             perl-JSON-XS inotify-tools lsof curl perl-Term-ReadLine-Gnu \
             perl-libwww-perl perl-Digest perl-Net-Server cryptsetup mosh \
             expect openssh-server nc bash perl-CGI perl(Test::More) passwd \
-            cracklib-dicts perl-Time-Piece perl-Time-HiRes which \
+            cracklib-dicts perl-Time-Piece perl-Time-HiRes diffutils \
             perl-Sys-Syslog pamtester google-authenticator qrencode-libs"
     if [ "$DISTRO_VERSION_MAJOR" = 7 ]; then
         wanted_list="$wanted_list fortune-mod coreutils"
@@ -102,14 +102,14 @@ elif echo "$DISTRO_LIKE" | grep -q -w rhel; then
     install_cmd="yum install"
 elif echo "$DISTRO_LIKE" | grep -q -w suse; then
     wanted_list="perl-common-sense perl-JSON perl-Net-Netmask perl-Net-IP \
-            perl-Net-DNS perl-DBD-SQLite perl-TermReadKey perl-DateTime \
+            perl-Net-DNS perl-DBD-SQLite perl-TermReadKey \
             fortune sudo fping \
-            xz sqlite binutils acl perl-TimeDate              gnupg rsync \
+            xz sqlite binutils acl gnupg rsync \
             perl-JSON-XS inotify-tools lsof curl perl-TermReadLine-Gnu \
             perl-libwww-perl perl-Digest perl-IO-Socket-SSL \
             perl-Net-Server cryptsetup mosh expect openssh \
             coreutils netcat-openbsd bash perl-CGI iputils \
-            perl-Time-HiRes which perl-Unix-Syslog hostname"
+            perl-Time-HiRes perl-Unix-Syslog hostname"
         wanted_list="$wanted_list google-authenticator-libpam"
             # perl-GnuPG
     [ "$opt_syslogng" = 1 ] && wanted_list="$wanted_list syslog-ng"
diff --git a/bin/helper/osh-groupCreate b/bin/helper/osh-groupCreate
index ef2b5a8..5b5bf20 100755
--- a/bin/helper/osh-groupCreate
+++ b/bin/helper/osh-groupCreate
@@ -175,6 +175,26 @@ $fnret->err eq 'OK'
 # Building /home/$group
 OVH::Bastion::touch_file("/home/$group/allowed.ip");
 
+osh_info("Adjusting permissions...");
+my $bigX = (OVH::Bastion::is_linux() ? 'X' : 'x');
+foreach my $command (
+    ['chown', '-R',               "$group:$group",            "/home/$group"],
+    ['chgrp', "$group-aclkeeper", "/home/$group/allowed.ip"],
+    ['chmod', '-R',               "o-rwx,g=r$bigX,u=rw$bigX", "/home/$group"],
+    ['chmod', '0664',             "/home/$group/allowed.ip"],
+  )
+{
+    $fnret = OVH::Bastion::execute(cmd => $command, noisy_stderr => 1);
+    $fnret->err eq 'OK'
+      or HEXIT('ERR_CHMOD_FAILED', msg => "Error while running chmod to adjust permissions (" . $fnret->msg . ")");
+}
+chmod 0751, "/home/$group" if !OVH::Bastion::has_acls();
+
+foreach my $gr ("$group-owner", "$group-gatekeeper", "$group-aclkeeper", "osh-whoHasAccessTo", "osh-auditor") {
+    OVH::Bastion::sys_setfacl(target => "/home/$group", perms => "g:$gr:x")
+      or HEXIT('ERR_SETFACL_FAILED', msg => "Error setting ACLs on group homedir");
+}
+
 osh_debug("Adding allowkeeper to group $group");
 $fnret = OVH::Bastion::add_user_to_group(group => $group, user => 'allowkeeper', groupType => 'key');
 $fnret or HEXIT($fnret);
@@ -239,26 +259,6 @@ if (!$no_key) {
     $fnret or HEXIT($fnret);
 }
 
-osh_info("Adjusting permissions...");
-my $bigX = (OVH::Bastion::is_linux() ? 'X' : 'x');
-foreach my $command (
-    ['chown', '-R',               "$group:$group",            "/home/$group"],
-    ['chgrp', "$group-aclkeeper", "/home/$group/allowed.ip"],
-    ['chmod', '-R',               "o-rwx,g=r$bigX,u=rw$bigX", "/home/$group"],
-    ['chmod', '0664',             "/home/$group/allowed.ip"],
-  )
-{
-    $fnret = OVH::Bastion::execute(cmd => $command, noisy_stderr => 1);
-    $fnret->err eq 'OK'
-      or HEXIT('ERR_CHMOD_FAILED', msg => "Error while running chmod to adjust permissions (" . $fnret->msg . ")");
-}
-chmod 0751, "/home/$group" if !OVH::Bastion::has_acls();
-
-foreach my $gr ("$group-owner", "$group-gatekeeper", "$group-aclkeeper", "osh-whoHasAccessTo", "osh-auditor") {
-    OVH::Bastion::sys_setfacl(target => "/home/$group", perms => "g:$gr:x")
-      or HEXIT('ERR_SETFACL_FAILED', msg => "Error setting ACLs on group homedir");
-}
-
 # allowed to sudo for the group
 osh_info("Configuring sudoers for this group");
 $fnret = OVH::Bastion::execute(cmd => [$OVH::Bastion::BASEPATH . '/bin/sudogen/generate-sudoers.sh', 'create', 'group', $group], must_succeed => 1, noisy_stdout => 1);
diff --git a/doc/sphinx/installation/basic.rst b/doc/sphinx/installation/basic.rst
index f680e52..849cf42 100644
--- a/doc/sphinx/installation/basic.rst
+++ b/doc/sphinx/installation/basic.rst
@@ -27,7 +27,7 @@ We published a Puppet module to handle The Bastion configuration and prerequisit
 The following Linux distros are tested with each release, but as this is a security product, you are *warmly* advised to run it on the latest up-to-date stable version of your favorite OS:
 
 - Debian 10 (Buster), 9 (Stretch), 8 (Jessie)
-- RHEL/CentOS 8, 7
+- RHEL/CentOS 8.x (8.3.2011, 8.2.2004, 8.1.1911), 7.x (7.9.2009, 7.8.2003, 7.7.1908)
 - Ubuntu LTS 20.04, 18.04, 16.04, 14.04\*
 - OpenSUSE Leap 15.2\*, 15.1\*, 15.0\*
 
diff --git a/docker/Dockerfile.centos7 b/docker/Dockerfile.centos7
index 14e8d44..71f2101 100644
--- a/docker/Dockerfile.centos7
+++ b/docker/Dockerfile.centos7
@@ -24,3 +24,4 @@ RUN ["/opt/bastion/bin/admin/install","--new-install","--no-wait"]
 ENTRYPOINT /opt/bastion/docker/entrypoint.sh
 
 # TESTENV HAS_ED25519=1 HAS_BLACKLIST=0 HAS_MFA=1 HAS_PAMTESTER=1
+# TESTFROM centos:7.9.2009 centos:7.8.2003 centos:7.7.1908
diff --git a/docker/Dockerfile.centos8 b/docker/Dockerfile.centos8
index 3607961..85bb3ca 100644
--- a/docker/Dockerfile.centos8
+++ b/docker/Dockerfile.centos8
@@ -24,3 +24,4 @@ RUN ["/opt/bastion/bin/admin/install","--new-install","--no-wait"]
 ENTRYPOINT /opt/bastion/docker/entrypoint.sh
 
 # TESTENV HAS_ED25519=1 HAS_BLACKLIST=0 HAS_MFA=1 HAS_PAMTESTER=1
+# TESTFROM centos:8.3.2011 centos:8.2.2004 centos:8.1.1911
diff --git a/tests/functional/docker/docker_build_and_run_tests.sh b/tests/functional/docker/docker_build_and_run_tests.sh
index 2829e92..4d4de9d 100755
--- a/tests/functional/docker/docker_build_and_run_tests.sh
+++ b/tests/functional/docker/docker_build_and_run_tests.sh
@@ -11,22 +11,56 @@ namespace=the-bastion-test
 target="$1"
 test_script="$2"
 
+get_supported_targets() {
+    local target targets subtarget
+    for dockerfile in "$(dirname "$0")"/../../../docker/Dockerfile.*; do
+        if grep -q '^# TESTENV ' "$dockerfile"; then
+            target=$(basename "$dockerfile")
+            target=${target/Dockerfile./}
+            # if the file has a TESTFROM entry, then it's actually multiple similar targets
+            if grep -q '^# TESTFROM ' "$dockerfile"; then
+                # shellcheck disable=SC2013
+                for testfrom in $(grep '^# TESTFROM ' "$dockerfile" | cut -d' ' -f3-); do
+                    subtarget="$target@$testfrom"
+                    targets="$targets $subtarget"
+                done
+            fi
+            targets="$targets $target"
+        fi
+    done
+    # shellcheck disable=SC2086
+    echo $targets
+}
+
+print_supported_targets() {
+    local target
+    for target in $(get_supported_targets | tr " " "\n" | sort); do
+        echo "- $target"
+    done
+    echo
+}
+
 if [ -z "$target" ] || [ "$target" = "--list-targets" ]; then
-    targets=$(grep -l '^# TESTENV' "$(dirname "$0")"/../../../docker/Dockerfile.* | sed -re 's=^.+/Dockerfile\.==')
     if [ -z "$target" ]; then
         echo "Usage: $0 <TARGET>" >&2
-        echo -n "Supported targets are: " >&2
-        grep -l '^# TESTENV' "$(dirname "$0")"/../../../docker/Dockerfile.* | sed -re 's=^.+/Dockerfile\.==' | tr '\n' " " >&2
-        echo >&2
+        echo "Supported targets are: " >&2
+        print_supported_targets >&2
         exit 1
     else
         # shellcheck disable=SC2086
-        echo $targets
+        print_supported_targets
         exit 0
     fi
 fi
 
-target_dockerfile="$(dirname "$0")"/../../../docker/Dockerfile."$target"
+if echo "$target" | grep -q '@'; then
+    subtarget=$(echo "$target" | cut -d@ -f2)
+    target_dockerfile=$(echo "$target" | cut -d@ -f1)
+else
+    subtarget=''
+    target_dockerfile="$target"
+fi
+target_dockerfile="$(dirname "$0")"/../../../docker/Dockerfile."$target_dockerfile"
 if [ ! -f "$target_dockerfile" ] ; then
     echo "Couldn't find a Dockerfile for $target ($target_dockerfile)" >&2
     exit 1
@@ -37,10 +71,35 @@ echo "Building test environment"
 testenv_dockerfile="$(dirname "$0")/../../../docker/Dockerfile.tester"
 docker build -f "$testenv_dockerfile" -t "$namespace:tester" "$(dirname "$0")"/../../..
 
+# if we have a subtarget, we need to override the FROM of the target_dockerfile
+# don't do this in place however, create a tempfile for this
+if [ -n "$subtarget" ]; then
+    dockerfiletmp=$(mktemp)
+    trap 'rm -f $dockerfiletmp' EXIT
+    sed -re "s/^FROM .+/FROM $subtarget/" "$target_dockerfile" > "$dockerfiletmp"
+    target_dockerfile="$dockerfiletmp"
+fi
+
 # build target
 echo "Building target environment"
+target=$(echo "$target" | sed -re 's/[^a-zA-Z0-9_-]/_/g')
 docker build -f "$target_dockerfile" -t "$namespace:$target" --build-arg "TEST_QUICK=$TEST_QUICK" "$(dirname "$0")"/../../..
 
+# get the target environment we want from the dockerfile
+varstoadd=''
+privileged=''
+for var in $(grep '^# TESTENV' "$target_dockerfile" | tail -n1 | sed -re 's/^# TESTENV//')
+do
+    echo "$var" | grep -Eq '^[A-Z0-9_]+=[01]$' && varstoadd="$varstoadd -e $var "
+    [ "$var" = "PRIVILEGED=1" ] && privileged='--privileged'
+done
+
+# cleanup the dockerfile temp if applicable
+if [ -n "$subtarget" ]; then
+    rm -f "$dockerfiletmp"
+    trap - EXIT
+fi
+
 # create temp key
 echo "Create user and root SSH keys"
 privdir=$(mktemp -d)
@@ -54,14 +113,6 @@ ROOT_PUBKEY_B64=$(base64 -w0 < "$privdir"/rootkey.pub)
 rm -rf "$privdir"
 trap - EXIT
 
-varstoadd=''
-privileged=''
-for var in $(grep '^# TESTENV' "$target_dockerfile" | tail -n1 | sed -re 's/^# TESTENV//')
-do
-    echo "$var" | grep -Eq '^[A-Z0-9_]+=[01]$' && varstoadd="$varstoadd -e $var "
-    [ "$var" = "PRIVILEGED=1" ] && privileged='--privileged'
-done
-
 echo "Configuring network"
 docker rm -f "bastion_${target}_target" 2>/dev/null || true
 docker rm -f "bastion_${target}_tester" 2>/dev/null || true