updates to fix errors in nessus install

Author: tatanus

lib/common_core

@@ -16,6 +16,55 @@ set -uo pipefail
 TOOL_CATEGORY_MAP["nessus"]="exploitation"
 APP_TESTS["nessus"]="/opt/nessus/bin/nasl -h"
 
+###############################################################################
+# wait_for_nessus_ready
+#==============================
+# Wait until Nessus service is fully initialized and ready for CLI actions
+#————————————————————
+# Usage:
+#   wait_for_nessus_ready <timeout_seconds>
+#
+# Example:
+#   wait_for_nessus_ready 120  # waits up to two minutes
+#
+# Return Values:
+#   0 = success (ready)
+#   1 = timeout
+#   2 = service not running
+###############################################################################
+function wait_for_nessus_ready() {
+    local timeout="${1:-120}"     # default: 120 seconds max
+    local log_file="/opt/nessus/var/nessus/logs/nessusd.messages"
+    local db_file="/opt/nessus/var/nessus/global.db"
+
+    echo "[*] Checking Nessus service status..."
+    if ! systemctl is-active --quiet nessusd.service; then
+        echo "[!] Nessus service is NOT running."
+        return 2
+    fi
+
+    echo "[*] Waiting up to ${timeout}s for Nessus to become ready..."
+    local elapsed=0
+    local interval=2
+
+    while ((elapsed < timeout)); do
+        # Check DB existence and minimum expected size
+        if [[ -f "${db_file}" ]] && [[ $(stat -c%s "${db_file}" 2> /dev/null) -gt 200000 ]]; then
+            # Look for "Nessus is ready" in log
+            if grep -q "Nessus is ready" "${log_file}" 2> /dev/null; then
+                echo "[+] Nessus is ready after ${elapsed}s!"
+                return 0
+            fi
+        fi
+
+        sleep "${interval}"
+        ((elapsed += interval))
+    done
+
+    echo "[!] Timeout reached. Nessus did not report ready."
+    return 1
+}
+
 function install_nessus() {
     # Check required environment variables
     check_env_var "INSTALL_NESSUS" || return "${FAIL}"
@@ -56,14 +105,22 @@ function install_nessus() {
     fi
     if ${SETUP_NESSUS}; then
         systemctl start nessusd.service
-        # Add a new user (automated user addition)
-        /opt/nessus/sbin/nessuscli adduser "${NESSUS_USER}" << EOF
+
+        if wait_for_nessus_ready 180; then
+            # Add a new user (automated user addition)
+            info "[+] Proceeding with Nessus CLI actions..."
+            /opt/nessus/sbin/nessuscli adduser << EOF
 ${NESSUSPASSWORD}
 ${NESSUSPASSWORD}
 y
 
 y
 EOF
+        else
+            warn "[!] Aborting — Nessus never initialized fully."
+            return
+        fi
+
         # Make Nessus listen only on 127.0.0.1
         /opt/nessus/sbin/nessuscli fix --set listen_address=127.0.0.1
         # Register Nessus