mirror of
https://github.com/ovh/debian-cis.git
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87 lines
2.5 KiB
Bash
Executable File
87 lines
2.5 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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# 13.14 Check for Duplicate UIDs (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="Checking for duplicate UIDs."
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EXCEPTIONS=""
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ERRORS=0
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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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RESULT=$(cut -f3 -d":" < /etc/passwd | sort -n | uniq -c | awk '{print $1":"$2}' )
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FOUND_EXCEPTIONS=""
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for LINE in $RESULT; do
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debug "Working on line $LINE"
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OCC_NUMBER=$(awk -F: '{print $1}' <<< "$LINE")
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USERID=$(awk -F: '{print $2}' <<< "$LINE")
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if [ "$OCC_NUMBER" -gt 1 ]; then
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USERS=$(awk -F: '($3 == n) { print $1 }' n="$USERID" /etc/passwd | xargs)
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ID_NAMES="($USERID): ${USERS}"
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if echo "$EXCEPTIONS" | grep -qw "$USERID"; then
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debug "$USERID is confirmed as an exception"
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FOUND_EXCEPTIONS="$FOUND_EXCEPTIONS $ID_NAMES"
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else
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ERRORS=$((ERRORS+1))
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crit "Duplicate UID $ID_NAMES"
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fi
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fi
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done
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if [ $ERRORS = 0 ]; then
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ok "No duplicate UIDs${FOUND_EXCEPTIONS:+ apart from configured exceptions:}${FOUND_EXCEPTIONS}"
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fi
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}
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# This function will be called if the script status is on enabled mode
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apply () {
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info "Editing automatically uids may seriously harm your system, report only here"
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}
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# This function will create the config file for this check with default values
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create_config() {
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cat <<EOF
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status=audit
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# Put here valid UIDs for which multiple usernames are accepted
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EXCEPTIONS=""
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EOF
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}
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# This function will check config parameters required
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check_config() {
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if [ -z "$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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. /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=/opt/debian-cis/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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