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https://github.com/ovh/debian-cis.git
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b41df080cf
* perform readonly checks as a regular user
* sudo -n is used for checks requiring root privileges
* increase accountability by providing log of individual access to sensitive files
73 lines
2.3 KiB
Bash
Executable File
73 lines
2.3 KiB
Bash
Executable File
#!/bin/bash
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#
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# CIS Debian 7/8 Hardening
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#
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#
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# 12.11 Find SGID System Executables (Not 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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HARDENING_LEVEL=2
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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 there are sgid files"
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RESULT=$(df --local -P | awk {'if (NR!=1) print $6'} | xargs -I '{}' $SUDO_CMD find '{}' -xdev -type f -perm -2000 -print)
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for BINARY in $RESULT; do
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if grep -q $BINARY <<< "$EXCEPTIONS"; then
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debug "$BINARY is confirmed as an exception"
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RESULT=$(sed "s!$BINARY!!" <<< $RESULT)
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fi
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done
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if [ ! -z "$RESULT" ]; then
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crit "Some sgid files are present"
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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 "No unknown sgid files found"
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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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info "Removing sgid on valid binary may seriously harm your system, report only here"
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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=disabled
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# Put here valid binaries with sgid enabled separated by spaces
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EXCEPTIONS="/sbin/unix_chkpwd /usr/bin/bsd-write /usr/bin/chage /usr/bin/crontab /usr/bin/expiry /usr/bin/mutt_dotlock /usr/bin/screen /usr/bin/ssh-agent /usr/bin/wall /usr/sbin/postdrop /usr/sbin/postqueue /usr/bin/at /usr/bin/dotlockfile /usr/bin/mail-lock /usr/bin/mail-touchlock /usr/bin/mail-unlock"
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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 "$EXCEPTIONS" ]; then
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EXCEPTIONS="@"
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fi
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}
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# Source Root Dir Parameter
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if [ -r /etc/default/cis-hardening ]; then
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. /etc/default/cis-hardening
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fi
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if [ -z "$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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. $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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