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small change in system updates to prevent error if UPDATES variabel is empty, add CrowdSec as IPS check, add FAIL for unsecure ssh ports above unprivileged ports threshhold

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This commit is contained in:
Jonas Voigt 2024-12-14 13:56:31 +01:00
parent 07abec919f
commit 1d1cd173b5
1 changed files with 25 additions and 13 deletions
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38
vps-audit.sh
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@ -124,13 +124,14 @@ else
check_security "SSH Password Auth" "FAIL" "Password authentication is enabled - consider using key-based authentication only" check_security "SSH Password Auth" "FAIL" "Password authentication is enabled - consider using key-based authentication only"
fi fi
# Check SSH default port # Check for unsecure SSH ports
UNPRIVILEGED_PORT_START=$(sysctl -n net.ipv4.ip_unprivileged_port_start)
SSH_PORT=$(grep "^Port" /etc/ssh/sshd_config | awk '{print $2}') SSH_PORT=$(grep "^Port" /etc/ssh/sshd_config | awk '{print $2}')
if [ -z "$SSH_PORT" ]; then
SSH_PORT="22"
fi
if [ "$SSH_PORT" = "22" ]; then if [ "$SSH_PORT" = "22" ]; then
check_security "SSH Port" "WARN" "Using default port 22 - consider changing to a non-standard port for security by obscurity" check_security "SSH Port" "WARN" "Using default port 22 - consider changing to a non-standard port for security by obscurity"
elif [ "$SSH_PORT" -ge "$UNPRIVILEGED_PORT_START" ]; then
check_security "SSH Port" "FAIL" "Using unprivileged port $SSH_PORT - use a port below $UNPRIVILEGED_PORT_START for better security"
else else
check_security "SSH Port" "PASS" "Using non-default port $SSH_PORT which helps prevent automated attacks" check_security "SSH Port" "PASS" "Using non-default port $SSH_PORT which helps prevent automated attacks"
fi fi
@ -149,17 +150,26 @@ else
check_security "Unattended Upgrades" "FAIL" "Automatic security updates are not configured - system may miss critical updates" check_security "Unattended Upgrades" "FAIL" "Automatic security updates are not configured - system may miss critical updates"
fi fi
# Check fail2ban # Check Intrusion Prevention Systems (Fail2ban or CrowdSec)
IPS_INSTALLED=0
IPS_ACTIVE=0
if dpkg -l | grep -q "fail2ban"; then if dpkg -l | grep -q "fail2ban"; then
if systemctl is-active fail2ban >/dev/null 2>&1; then IPS_INSTALLED=1
check_security "Fail2ban" "PASS" "Brute force protection is active and running" systemctl is-active fail2ban >/dev/null 2>&1 && IPS_ACTIVE=1
else
check_security "Fail2ban" "WARN" "Fail2ban is installed but not running - brute force protection is disabled"
fi
else
check_security "Fail2ban" "FAIL" "No brute force protection installed - system is vulnerable to login attacks"
fi fi
if dpkg -l | grep -q "crowdsec"; then
IPS_INSTALLED=1
systemctl is-active crowdsec >/dev/null 2>&1 && IPS_ACTIVE=1
fi
case "$IPS_INSTALLED$IPS_ACTIVE" in
"11") check_security "Intrusion Prevention" "PASS" "Fail2ban or CrowdSec is installed and running" ;;
"10") check_security "Intrusion Prevention" "WARN" "Fail2ban or CrowdSec is installed but not running" ;;
*) check_security "Intrusion Prevention" "FAIL" "No intrusion prevention system (Fail2ban or CrowdSec) is installed" ;;
esac
# Check failed login attempts # Check failed login attempts
FAILED_LOGINS=$(grep "Failed password" /var/log/auth.log 2>/dev/null | wc -l) FAILED_LOGINS=$(grep "Failed password" /var/log/auth.log 2>/dev/null | wc -l)
if [ "$FAILED_LOGINS" -lt 10 ]; then if [ "$FAILED_LOGINS" -lt 10 ]; then
@ -172,12 +182,14 @@ fi
# Check system updates # Check system updates
UPDATES=$(apt-get -s upgrade 2>/dev/null | grep -P '^\d+ upgraded' | cut -d" " -f1) UPDATES=$(apt-get -s upgrade 2>/dev/null | grep -P '^\d+ upgraded' | cut -d" " -f1)
if [ -z "$UPDATES" ]; then
UPDATES=0
fi
if [ "$UPDATES" -eq 0 ]; then if [ "$UPDATES" -eq 0 ]; then
check_security "System Updates" "PASS" "All system packages are up to date" check_security "System Updates" "PASS" "All system packages are up to date"
else else
check_security "System Updates" "FAIL" "$UPDATES security updates available - system is vulnerable to known exploits" check_security "System Updates" "FAIL" "$UPDATES security updates available - system is vulnerable to known exploits"
fi fi
# Check running services # Check running services
SERVICES=$(systemctl list-units --type=service --state=running | grep "loaded active running" | wc -l) SERVICES=$(systemctl list-units --type=service --state=running | grep "loaded active running" | wc -l)
if [ "$SERVICES" -lt 20 ]; then if [ "$SERVICES" -lt 20 ]; then