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https://github.com/ovh/debian-cis.git
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32886d3a3d
* Replace CIS_ROOT_DIR by a more flexible system * Try to adapt the logic change to the functional tests
102 lines
3.5 KiB
Bash
Executable File
102 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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# 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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# find emits following error if directory or file disappear during
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# tree traversal: find: ‘/tmp/xxx’: No such file or directory
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FIND_IGNORE_NOSUCHFILE_ERR=false
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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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if [ -n "$IGNORED_PATH" ]; then
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# maybe IGNORED_PATH allow us to filter out some FS
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FS_NAMES=$(df --local -P | awk '{if (NR!=1) print $6}' | grep -vE "$IGNORED_PATH")
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[ "${FIND_IGNORE_NOSUCHFILE_ERR}" = true ] && set +e
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# shellcheck disable=2086
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FOUND_BINARIES=$($SUDO_CMD find $FS_NAMES -xdev -ignore_readdir_race -type f -perm -4000 -regextype 'egrep' ! -regex $IGNORED_PATH -print)
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[ "${FIND_IGNORE_NOSUCHFILE_ERR}" = true ] && set -e
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else
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FS_NAMES=$(df --local -P | awk '{if (NR!=1) print $6}')
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[ "${FIND_IGNORE_NOSUCHFILE_ERR}" = true ] && set +e
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# shellcheck disable=2086
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FOUND_BINARIES=$($SUDO_CMD find $FS_NAMES -xdev -ignore_readdir_race -type f -perm -4000 -print)
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[ "${FIND_IGNORE_NOSUCHFILE_ERR}" = true ] && set -e
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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_LIB_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_LIB_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 "${CIS_LIB_DIR}"/main.sh ]; then
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# shellcheck source=../../lib/main.sh
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. "${CIS_LIB_DIR}"/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_LIB_DIR in /etc/default/cis-hardening"
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exit 128
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fi
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