- pam_use_authtok_enabled.sh -> 5.3.3.4.4

Author: damien cavagnini

bin/hardening/pam_use_authtok_enabled.sh

@@ -0,0 +1,90 @@
+#!/bin/bash
+
+# run-shellcheck
+#
+# CIS Debian Hardening
+#
+
+#
+# Ensure pam_pwhistory module is enabled (Automated)
+#
+
+set -e # One error, it's over
+set -u # One variable unset, it's over
+
+# shellcheck disable=2034
+HARDENING_LEVEL=3
+# shellcheck disable=2034
+DESCRIPTION="Ensure use_authtok is enabled "
+
+PAM_FILE="/etc/pam.d/common-password"
+PAM_PATTERN="^[^#]pam_unix.so.*use_authtok"
+
+# This function will be called if the script status is on enabled / audit mode
+audit() {
+    PAM_VALID=1
+
+    if $SUDO_CMD grep "$PAM_PATTERN" "$PAM_FILE" 2>/dev/null; then
+        ok "use_authtok is enabled"
+        PAM_VALID=0
+    else
+        crit "use_authtok is not enabled"
+    fi
+}
+
+# This function will be called if the script status is on enabled mode
+apply() {
+    if [ "$PAM_VALID" -ne 0 ]; then
+        # we need to configure it in files present in /usr/share/pam-configs/, in the "Password" sections, but not in
+        # the "Password-Initial" section
+        local output_file="/$HOME/use_authtok_awk_output"
+
+        for pam_file in /usr/share/pam-configs/*; do
+            # if we are in section "Password", f=1
+            # if we are in any section (line starting by any word ending with ':') but not in "Password" section, f=0
+            # if f==1 then check for pam_unix.so and use_authtok, and add the later if absent
+            # use a temporary file, as we can not replace in place
+            awk '/Password:/ {f=1} /[a-zA-Z].*:/ && ! /Password:/ {f=0}  f{if (/pam_unix\.so/ && ! /use_authtok/) sub("pam_unix.so","pam_unix.so use_authtok")} {print}' "$pam_file" >"$output_file"
+
+            does_file_exist "$output_file"
+            if [ "$FNRET" -eq 0 ]; then
+                pam_file_basename=$(basename "$pam_file")
+
+                info "backup $pam_file to $HOME"
+                mv "$pam_file" "$HOME"/"$pam_file_basename"_"$(date +%s)"
+                info "replace $pam_file"
+                mv "$output_file" "$pam_file"
+                rm -f "$output_file"
+
+                info "Applying 'pam-auth-update' to enable use_authtok"
+                DEBIAN_FRONTEND='noninteractive' pam-auth-update --force --enable "$pam_file_basename"
+            fi
+
+        done
+    fi
+}
+
+# This function will check config parameters required
+check_config() {
+    :
+}
+
+# Source Root Dir Parameter
+if [ -r /etc/default/cis-hardening ]; then
+    # shellcheck source=../../debian/default
+    . /etc/default/cis-hardening
+fi
+if [ -z "$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/pam_use_authtok_enabled.sh

@@ -0,0 +1,25 @@
+# shellcheck shell=bash
+# run-shellcheck
+test_audit() {
+
+    describe Prepare on purpose failed test
+    cp /usr/share/pam-configs/unix /tmp/pam_config_unix.save
+    sed -i 's/use_authtok//g' /usr/share/pam-configs/unix
+
+    describe Running on purpose failed test
+    register_test retvalshouldbe 1
+    # shellcheck disable=2154
+    run failed "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
+
+    describe fix situation
+    sed -i 's/audit/enabled/' "${CIS_CONF_DIR}/conf.d/${script}.cfg"
+    "${CIS_CHECKS_DIR}/${script}.sh" --apply || true
+
+    describe Checking resolved state
+    register_test retvalshouldbe 0
+    run resolved "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
+
+    describe clean test
+    cp /tmp/pam_config_unix.save /usr/share/pam-configs/unix
+
+}