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108 lines
3.5 KiB
Bash
Executable File
108 lines
3.5 KiB
Bash
Executable File
#!/bin/bash
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# run-shellcheck
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#
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# CIS Debian Hardening
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#
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#
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# 1.1.21 Ensure sticky bit is set on all world-writable directories (Scored)
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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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# shellcheck disable=2034
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HARDENING_LEVEL=2
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# shellcheck disable=2034
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DESCRIPTION="Set sticky bit on world writable directories to prevent users from deleting or renaming files that are not owned by them."
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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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info "Checking if setuid is set on world writable Directories"
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FS_NAMES=$(df --local -P | awk '{if (NR!=1) print $6}')
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# shellcheck disable=SC2086
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RESULT=$($SUDO_CMD find $FS_NAMES -xdev -type d \( -perm -0002 -a ! -perm -1000 \) -print 2>/dev/null)
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IFS_BAK=$IFS
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IFS=$'\n'
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for LINE in $RESULT; do
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debug "line : $LINE"
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if echo "$EXCEPTIONS" | grep -q "$LINE"; then
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debug "$LINE is confirmed as an exception"
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# shellcheck disable=SC2001
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RESULT=$(sed "s!$LINE!!" <<<"$RESULT")
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else
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debug "$LINE not found in exceptions"
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fi
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done
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IFS=$IFS_BAK
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if [ -n "$RESULT" ]; then
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crit "Some world writable directories are not on sticky bit mode!"
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# shellcheck disable=SC2001
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FORMATTED_RESULT=$(sed "s/ /\n/g" <<<"$RESULT" | sort | uniq | tr '\n' ' ')
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crit "$FORMATTED_RESULT"
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else
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ok "All world writable directories have a sticky bit"
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fi
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}
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# This function will be called if the script status is on enabled mode
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apply() {
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RESULT=$(df --local -P | awk '{if (NR!=1) print $6}' | xargs -I '{}' find '{}' -xdev -type d \( -perm -0002 -a ! -perm -1000 \) -print 2>/dev/null)
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IFS_BAK=$IFS
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IFS=$'\n'
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for LINE in $RESULT; do
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debug "line : $LINE"
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if echo "$EXCEPTIONS" | grep -q "$ACCOUNT"; then
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debug "$ACCOUNT is confirmed as an exception"
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# shellcheck disable=SC2001
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RESULT=$(sed "s!$LINE!!" <<<"$RESULT")
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else
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debug "$ACCOUNT not found in exceptions"
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fi
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done
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IFS=$IFS_BAK
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if [ -n "$RESULT" ]; then
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warn "Setting sticky bit on world writable directories"
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df --local -P | awk '{if (NR!=1) print $6}' | xargs -I '{}' find '{}' -xdev -type d -perm -0002 2>/dev/null | xargs chmod a+t
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else
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ok "All world writable directories have a sticky bit, nothing to apply"
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fi
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}
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# This function will create the config file for this check with default values
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create_config() {
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cat <<EOF
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status=audit
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# Put here your exceptions separated by spaces
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EXCEPTIONS=""
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EOF
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}
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# This function will check config parameters required
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check_config() {
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if [ -z "$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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if [ -r /etc/default/cis-hardening ]; then
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# shellcheck source=../../debian/default
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. /etc/default/cis-hardening
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fi
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if [ -z "$CIS_ROOT_DIR" ]; then
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echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
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echo "Cannot source CIS_ROOT_DIR variable, aborting."
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exit 128
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fi
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# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
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if [ -r "$CIS_ROOT_DIR"/lib/main.sh ]; then
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# shellcheck source=../../lib/main.sh
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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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