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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.
91 lines
2.6 KiB
Bash
Executable File
91 lines
2.6 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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# 6.2.5 Ensure root is the only UID 0 account (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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# shellcheck disable=2034
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HARDENING_LEVEL=2
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# shellcheck disable=2034
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# shellcheck disable=2034
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DESCRIPTION="Verify root is the only UID 0 account."
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EXCEPTIONS=""
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FILE='/etc/passwd'
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RESULT=''
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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 accounts have uid 0"
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RESULT=$(awk -F: '($3 == 0 && $1!="root" ) { print $1 }' "$FILE")
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FOUND_EXCEPTIONS=""
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for ACCOUNT in $RESULT; do
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debug "Account : $ACCOUNT"
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debug "Exceptions : $EXCEPTIONS"
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debug "echo \"$EXCEPTIONS\" | grep -qw $ACCOUNT"
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if echo "$EXCEPTIONS" | grep -qw "$ACCOUNT"; then
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debug "$ACCOUNT is confirmed as an exception"
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# shellcheck disable=SC2001
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RESULT=$(sed "s!$ACCOUNT!!" <<<"$RESULT")
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FOUND_EXCEPTIONS="$FOUND_EXCEPTIONS $ACCOUNT"
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else
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debug "$ACCOUNT not found in exceptions"
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fi
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done
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if [ -n "$RESULT" ]; then
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crit "Some accounts have uid 0: $(tr '\n' ' ' <<<"$RESULT")"
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else
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ok "No account with uid 0 appart from root ${FOUND_EXCEPTIONS:+and configured exceptions:}$FOUND_EXCEPTIONS"
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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 accounts with uid 0 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 valid accounts with uid 0 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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