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aebb65889e
And use it as default version. To this end, the scripts in bin/hardening have been made generic by removing the associated recommendation number. Only impact is if you are used to execute scripts directly from bin/hardening. In this case, please use the "bin/hardening.sh" wrapper as intended. I had to rename 2.3.1_disable_nis.sh to uninstall_nis.sh, as it was conflicting with 2.3.1_disable_nis.sh Also, there was a doublon between 1.1.1.8_disable_cramfs.sh and 99.1.1.1_disable_cramfs.sh ; the former was kept
98 lines
3.7 KiB
Bash
Executable File
98 lines
3.7 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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EXCEPTIONS=''
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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 setuid is set on world writable Directories"
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if [ -n "$EXCEPTIONS" ]; then
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# maybe EXCEPTIONS allow us to filter out some FS
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FS_NAMES=$(df --local -P | awk '{if (NR!=1) print $6}' | grep -vE "$EXCEPTIONS")
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[ "${FIND_IGNORE_NOSUCHFILE_ERR}" = true ] && set +e
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# shellcheck disable=SC2086
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RESULT=$($SUDO_CMD find $FS_NAMES -xdev -ignore_readdir_race -type d \( -perm -0002 -a ! -perm -1000 \) -regextype 'egrep' ! -regex $EXCEPTIONS -print 2>/dev/null)
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[ "${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=SC2086
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RESULT=$($SUDO_CMD find $FS_NAMES -xdev -ignore_readdir_race -type d \( -perm -0002 -a ! -perm -1000 \) -print 2>/dev/null)
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[ "${FIND_IGNORE_NOSUCHFILE_ERR}" = true ] && set -e
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fi
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if [ -n "$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 "$FORMATTED_RESULT"
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else
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ok "All world writable directories have a sticky bit"
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fi
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}
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# This function will be called if the script status is on enabled mode
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apply() {
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if [ -n "$EXCEPTIONS" ]; then
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# shellcheck disable=SC2086
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RESULT=$(df --local -P | awk '{if (NR!=1) print $6}' | grep -vE "$EXCEPTIONS" | xargs -I '{}' find '{}' -xdev -ignore_readdir_race -type d \( -perm -0002 -a ! -perm -1000 \) -regextype 'egrep' ! -regex "$EXCEPTIONS" -print 2>/dev/null)
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else
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RESULT=$(df --local -P | awk '{if (NR!=1) print $6}' | xargs -I '{}' find '{}' -xdev -ignore_readdir_race -type d \( -perm -0002 -a ! -perm -1000 \) -print 2>/dev/null)
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fi
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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 $6}' | xargs -I '{}' find '{}' -xdev -ignore_readdir_race -type d -perm -0002 2>/dev/null | xargs chmod a+t
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else
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ok "All world writable directories have a sticky bit, nothing to apply"
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fi
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}
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# This function will check config parameters required
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check_config() {
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# No param for this function
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:
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}
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# Source Root Dir Parameter
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if [ -r /etc/default/cis-hardening ]; then
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# shellcheck source=../../debian/default
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. /etc/default/cis-hardening
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fi
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if [ -z "$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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