add ssl discover check

files/nrpe/check_ssl_cert

@@ -0,0 +1,73 @@
+#!/bin/bash
+
+# Default thresholds (in days)
+WARN_DAYS=30
+CRIT_DAYS=15
+
+# Nagios Exit Codes
+STATE_OK=0
+STATE_WARNING=1
+STATE_CRITICAL=2
+STATE_UNKNOWN=3
+
+usage() {
+    echo "Usage: $0 -p <path1,path2> [-w <warn_days>] [-c <crit_days>]"
+    exit $STATE_UNKNOWN
+}
+
+# Parse arguments
+while getopts "p:w:c:" opt; do
+    case $opt in
+        p) IFS=',' read -ra PATHS <<< "$OPTARG" ;;
+        w) WARN_DAYS=$OPTARG ;;
+        c) CRIT_DAYS=$OPTARG ;;
+        *) usage ;;
+    esac
+done
+
+if [[ -z "${PATHS[*]}" ]]; then usage; fi
+
+# Variables to track overall status
+final_status=$STATE_OK
+output_msg=""
+
+for search_path in "${PATHS[@]}"; do
+    if [[ ! -d "$search_path" ]]; then
+        output_msg+="Path $search_path not found; "
+        final_status=$STATE_UNKNOWN
+        continue
+    fi
+
+    # Find common cert extensions
+    certs=$(find "$search_path" -type f \( -name "*.crt" -o -name "*.pem" \))
+
+    for cert in $certs; do
+        # Extract expiration date using openssl
+        expiry_date=$(openssl x509 -enddate -noout -in "$cert" 2>/dev/null | cut -d= -f2)
+        
+        if [[ -z "$expiry_date" ]]; then continue; fi
+
+        # Convert dates to seconds for comparison
+        expiry_epoch=$(date -d "$expiry_date" +%s)
+        now_epoch=$(date +%s)
+        expiry_diff=$(( (expiry_epoch - now_epoch) / 86400 ))
+
+        # Logic for Nagios status
+        if [[ $expiry_diff -le $CRIT_DAYS ]]; then
+            output_msg+="$(basename "$cert") EXPIRES IN $expiry_diff DAYS; "
+            final_status=$STATE_CRITICAL
+        elif [[ $expiry_diff -le $WARN_DAYS ]]; then
+            output_msg+="$(basename "$cert") expires in $expiry_diff days; "
+            [[ $final_status -lt $STATE_WARNING ]] && final_status=$STATE_WARNING
+        fi
+    done
+done
+
+# Final Output
+if [[ $final_status -eq $STATE_OK ]]; then
+    echo "OK: All certificates are valid for more than $WARN_DAYS days."
+else
+    echo "STATUS: $output_msg"
+fi
+
+exit $final_status