2016-04-16 18:11:53 +02:00
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#!/bin/bash
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#
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2019-02-06 15:19:14 +01:00
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# CIS Debian Hardening
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2016-04-16 18:11:53 +02:00
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#
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#
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2019-09-12 17:43:12 +02:00
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# 6.2.8 Check Permissions on User Home Directories (Scored)
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2016-04-16 18:11:53 +02:00
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#
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set -e # One error, it's over
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set -u # One variable unset, it's over
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2017-05-18 18:40:09 +02:00
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HARDENING_LEVEL=2
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2017-10-31 17:44:15 +01:00
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DESCRIPTION="Check permissions on user home directories."
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2017-05-18 18:40:09 +02:00
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2016-04-16 18:11:53 +02:00
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ERRORS=0
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# This function will be called if the script status is on enabled / audit mode
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audit () {
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2020-11-05 11:25:52 +01:00
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for dir in $(cat /etc/passwd | /bin/egrep -v '(root|halt|sync|shutdown)' | awk -F: '($7 != "/usr/sbin/nologin" && $7 != "/sbin/nologin" && $7 != "/bin/false" && $7 !="/nonexistent" ) { print $6 }'); do
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2016-04-16 18:11:53 +02:00
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debug "Working on $dir"
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debug "Exceptions : $EXCEPTIONS"
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debug "echo \"$EXCEPTIONS\" | grep -q $dir"
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if echo "$EXCEPTIONS" | grep -q $dir; then
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debug "$dir is confirmed as an exception"
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RESULT=$(sed "s!$dir!!" <<< "$RESULT")
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else
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debug "$dir not found in exceptions"
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fi
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if [ -d $dir ]; then
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dirperm=$(/bin/ls -ld $dir | cut -f1 -d" ")
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if [ $(echo $dirperm | cut -c6 ) != "-" ]; then
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crit "Group Write permission set on directory $dir"
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2016-04-16 18:32:09 +02:00
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ERRORS=$((ERRORS+1))
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2016-04-16 18:11:53 +02:00
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fi
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if [ $(echo $dirperm | cut -c8 ) != "-" ]; then
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crit "Other Read permission set on directory $dir"
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2016-04-16 18:32:09 +02:00
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ERRORS=$((ERRORS+1))
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2016-04-16 18:11:53 +02:00
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fi
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if [ $(echo $dirperm | cut -c9 ) != "-" ]; then
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crit "Other Write permission set on directory $dir"
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2016-04-16 18:32:09 +02:00
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ERRORS=$((ERRORS+1))
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2016-04-16 18:11:53 +02:00
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fi
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if [ $(echo $dirperm | cut -c10 ) != "-" ]; then
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crit "Other Execute permission set on directory $dir"
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2016-04-16 18:32:09 +02:00
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ERRORS=$((ERRORS+1))
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2016-04-16 18:11:53 +02:00
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fi
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fi
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done
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2016-04-16 18:32:09 +02:00
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if [ $ERRORS = 0 ]; then
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ok "No incorrect permissions on home directories"
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fi
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2016-04-16 18:11:53 +02:00
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}
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# This function will be called if the script status is on enabled mode
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apply () {
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2020-11-05 11:25:52 +01:00
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for dir in $(cat /etc/passwd | /bin/egrep -v '(root|halt|sync|shutdown)' | awk -F: '($7 != "/usr/sbin/nologin" && $7 != "/sbin/nologin" && $7 != "/bin/false" && $7 !="/nonexistent" ) { print $6 }'); do
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2016-04-16 18:11:53 +02:00
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debug "Working on $dir"
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debug "Exceptions : $EXCEPTIONS"
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debug "echo \"$EXCEPTIONS\" | grep -q $dir"
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if echo "$EXCEPTIONS" | grep -q $dir; then
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debug "$dir is confirmed as an exception"
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RESULT=$(sed "s!$dir!!" <<< "$RESULT")
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else
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debug "$dir not found in exceptions"
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fi
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if [ -d $dir ]; then
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dirperm=$(/bin/ls -ld $dir | cut -f1 -d" ")
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if [ $(echo $dirperm | cut -c6 ) != "-" ]; then
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warn "Group Write permission set on directory $dir"
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chmod g-w $dir
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fi
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if [ $(echo $dirperm | cut -c8 ) != "-" ]; then
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warn "Other Read permission set on directory $dir"
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chmod o-r $dir
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fi
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if [ $(echo $dirperm | cut -c9 ) != "-" ]; then
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warn "Other Write permission set on directory $dir"
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chmod o-w $dir
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fi
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if [ $(echo $dirperm | cut -c10 ) != "-" ]; then
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warn "Other Execute permission set on directory $dir"
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chmod o-x $dir
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fi
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fi
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done
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}
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2017-05-18 18:40:09 +02:00
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# This function will create the config file for this check with default values
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create_config() {
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cat <<EOF
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2019-02-14 14:33:21 +01:00
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status=audit
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2017-05-18 18:40:09 +02:00
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# Put here user home directories exceptions, separated by spaces
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EXCEPTIONS=""
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EOF
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}
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2016-04-16 18:11:53 +02:00
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# This function will check config parameters required
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check_config() {
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if [ -z "$EXCEPTIONS" ]; then
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EXCEPTIONS="@"
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fi
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}
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# Source Root Dir Parameter
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2017-10-25 14:50:39 +02:00
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if [ -r /etc/default/cis-hardening ]; then
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2016-04-18 17:39:14 +02:00
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. /etc/default/cis-hardening
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2017-10-25 14:50:39 +02:00
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fi
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if [ -z "$CIS_ROOT_DIR" ]; then
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2017-11-17 15:13:27 +01:00
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echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
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2017-10-25 14:50:39 +02:00
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echo "Cannot source CIS_ROOT_DIR variable, aborting."
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exit 128
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fi
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2016-04-16 18:11:53 +02:00
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# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
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2016-04-21 23:19:50 +02:00
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if [ -r $CIS_ROOT_DIR/lib/main.sh ]; then
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. $CIS_ROOT_DIR/lib/main.sh
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else
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echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_ROOT_DIR in /etc/default/cis-hardening"
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exit 128
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fi
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