- etc_passwd_groups_in_etc_group.sh -> 7.2.3

Author: damien cavagnini

bin/hardening/etc_passwd_groups_in_etc_group.sh

@@ -0,0 +1,71 @@
+#!/bin/bash
+
+# run-shellcheck
+#
+# CIS Debian Hardening
+#
+
+#
+# Ensure all groups in /etc/passwd exist in /etc/group (Manual)
+#
+
+set -e # One error, it's over
+set -u # One variable unset, it's over
+
+# shellcheck disable=2034
+HARDENING_LEVEL=1
+# shellcheck disable=2034
+DESCRIPTION="Ensure all groups in /etc/passwd exist in /etc/group"
+
+# This function will be called if the script status is on enabled / audit mode
+audit() {
+    local invalid_group_gid=""
+    local passwd_group_gid=""
+    local group_gid=""
+
+    # straight from the debian CIS pdf, works fine as is
+    passwd_group_gid=("$(awk -F: '{print $4}' /etc/passwd | sort -u)")
+    group_gid=("$(awk -F: '{print $3}' /etc/group | sort -u)")
+    passwd_group_diff=("$(printf '%s\n' "${group_gid[@]}" "${passwd_group_gid[@]}" | sort | uniq -u)")
+
+    while IFS= read -r l_gid; do
+        invalid_group_gid=$(awk -F: '($4 == '"$l_gid"')' /etc/passwd)
+        if [ -n "$invalid_group_gid" ]; then
+            crit "group with gid $invalid_group_gid is present in /etc/passwd but absent from /etc/group"
+        fi
+    done < <(printf '%s\n' "${passwd_group_gid[@]}" "${passwd_group_diff[@]}" | sort | uniq -D | uniq)
+
+}
+
+# This function will be called if the script status is on enabled mode
+apply() {
+    # the CIS recommendation is to do it in an automated way, while also "Investigate to determine if the account is logged in and what it is being used for, to
+    # determine if it needs to be forced off"
+    # so we do this manually
+    info "Please review the faulty accounts and update their password configuration, or set them as exceptions in the configuration"
+}
+
+# This function will check config parameters required
+check_config() {
+    :
+}
+
+# Source Root Dir Parameter
+if [ -r /etc/default/cis-hardening ]; then
+    # shellcheck source=../../debian/default
+    . /etc/default/cis-hardening
+fi
+if [ -z "$CIS_LIB_DIR" ]; then
+    echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
+    echo "Cannot source CIS_LIB_DIR variable, aborting."
+    exit 128
+fi
+
+# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
+if [ -r "${CIS_LIB_DIR}"/main.sh ]; then
+    # shellcheck source=../../lib/main.sh
+    . "${CIS_LIB_DIR}"/main.sh
+else
+    echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_LIB_DIR in /etc/default/cis-hardening"
+    exit 128
+fi

tests/hardening/etc_passwd_groups_in_etc_group.sh

@@ -0,0 +1,21 @@
+# shellcheck shell=bash
+# run-shellcheck
+test_audit() {
+    describe prepare failing test
+    local test_user="wrong_group_user"
+    useradd -M "$test_user"
+    sed -i "/^$test_user:/d" /etc/group
+
+    describe Tests purposely failing
+    register_test retvalshouldbe 1
+    # shellcheck disable=2154
+    run noncompliant "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
+
+    describe fixing situation
+    userdel -r "$test_user"
+
+    describe Checking resolved state
+    register_test retvalshouldbe 0
+    run resolved "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
+
+}