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b9e129d8fe
Shellcheck recommands to replace sed by shell expansions in 'simple' cases. However, the replacement here is likely to lead to erros, so we disable this rule. Moreover, it does'nt really add readability.
88 lines
2.9 KiB
Bash
Executable File
88 lines
2.9 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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# 6.1.13 Audit SUID 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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# shellcheck disable=2034
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HARDENING_LEVEL=2
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# shellcheck disable=2034
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DESCRIPTION="Find SUID system executables."
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IGNORED_PATH=''
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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 suid files"
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FS_NAMES=$(df --local -P | awk '{ if (NR!=1) print $6 }')
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# shellcheck disable=2086
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if [ -n "$IGNORED_PATH" ]; then
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FOUND_BINARIES=$($SUDO_CMD find $FS_NAMES -xdev -type f -perm -4000 -regextype 'egrep' ! -regex "$IGNORED_PATH" -print)
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else
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FOUND_BINARIES=$($SUDO_CMD find $FS_NAMES -xdev -type f -perm -4000 -print)
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fi
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BAD_BINARIES=""
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for BINARY in $FOUND_BINARIES; do
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if grep -qw "$BINARY" <<<"$EXCEPTIONS"; then
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debug "$BINARY is confirmed as an exception"
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else
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BAD_BINARIES="$BAD_BINARIES $BINARY"
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fi
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done
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if [ -n "$BAD_BINARIES" ]; then
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crit "Some suid files are present"
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# shellcheck disable=SC2001
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FORMATTED_RESULT=$(sed "s/ /\n/g" <<<"$BAD_BINARIES" | sort | uniq | tr '\n' ' ')
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crit "$FORMATTED_RESULT"
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else
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ok "No unknown suid 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 suid 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=audit
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# Put Here your valid suid binaries so that they do not appear during the audit
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EXCEPTIONS="/bin/mount /usr/bin/mount /bin/ping /usr/bin/ping /bin/ping6 /usr/bin/ping6 /bin/su /usr/bin/su /bin/umount /usr/bin/umount /usr/bin/chfn /usr/bin/chsh /usr/bin/fping /usr/bin/fping6 /usr/bin/gpasswd /usr/bin/mtr /usr/bin/newgrp /usr/bin/passwd /usr/bin/sudo /usr/bin/sudoedit /usr/lib/openssh/ssh-keysign /usr/lib/pt_chown /usr/bin/at"
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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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# No param for this function
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:
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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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