add security settings for nginx (#159)

Co-authored-by: diegolamaral <diego.arruda.amaral@gmail.com>

core/files/entrypoint_nginx.sh

@@ -226,6 +226,47 @@ init_nginx() {
         fi
     fi
 
+    # Adjust Content-Security-Policy
+    echo "... adjusting Content-Security-Policy"
+    # Remove any existing CSP header
+    sed -i '/add_header Content-Security-Policy/d' /etc/nginx/includes/misp
+
+    if [[ -n "$CONTENT_SECURITY_POLICY" ]]; then
+        # If $CONTENT_SECURITY_POLICY is set, add CSP header
+        echo "... setting Content-Security-Policy to '$CONTENT_SECURITY_POLICY'"
+        sed -i "/add_header X-Download-Options/a add_header Content-Security-Policy \"$CONTENT_SECURITY_POLICY\";" /etc/nginx/includes/misp
+    else
+        # Otherwise, do not add any CSP headers
+        echo "... no Content-Security-Policy header will be set as CONTENT_SECURITY_POLICY is not defined"
+    fi
+
+    # Adjust X-Frame-Options
+    echo "... adjusting X-Frame-Options"
+    # Remove any existing X-Frame-Options header
+    sed -i '/add_header X-Frame-Options/d' /etc/nginx/includes/misp
+
+    if [[ -z "$X_FRAME_OPTIONS" ]]; then
+        echo "... setting 'X-Frame-Options SAMEORIGIN'"
+        sed -i "/add_header X-Download-Options/a add_header X-Frame-Options \"SAMEORIGIN\" always;" /etc/nginx/includes/misp
+    else
+        echo "... setting 'X-Frame-Options $X_FRAME_OPTIONS'"
+        sed -i "/add_header X-Download-Options/a add_header X-Frame-Options \"$X_FRAME_OPTIONS\";" /etc/nginx/includes/misp
+    fi
+
+    # Adjust HTTP Strict Transport Security (HSTS)
+    echo "... adjusting HTTP Strict Transport Security (HSTS)"
+    # Remove any existing HSTS header
+    sed -i '/add_header Strict-Transport-Security/d' /etc/nginx/includes/misp
+
+    if [[ -n "$HSTS_MAX_AGE" ]]; then
+        # If $HSTS_MAX_AGE is defined, add the HSTS header
+        echo "... setting HSTS to 'max-age=$HSTS_MAX_AGE; includeSubdomains'"
+        sed -i "/add_header X-Download-Options/a add_header Strict-Transport-Security \"max-age=$HSTS_MAX_AGE; includeSubdomains\";" /etc/nginx/includes/misp
+    else
+        # Otherwise, do nothing, keeping without the HSTS header
+        echo "... no HSTS header will be set as HSTS_MAX_AGE is not defined"
+    fi
+
     # Testing for files also test for links, and generalize better to mounted files
     if [[ ! -f "/etc/nginx/sites-enabled/misp80" ]]; then
         echo "... enabling port 80 redirect"

docker-compose.yml

@@ -193,6 +193,10 @@ services:
       - "PHP_UPLOAD_MAX_FILESIZE=${PHP_UPLOAD_MAX_FILESIZE:-50M}"
       - "PHP_POST_MAX_SIZE=${PHP_POST_MAX_SIZE:-50M}"
       - "PHP_MAX_INPUT_TIME:${PHP_MAX_INPUT_TIME:-300}"
+      # Security Settings
+      - "HSTS_MAX_AGE=${HSTS_MAX_AGE}"
+      - "X_FRAME_OPTIONS=${X_FRAME_OPTIONS}"
+      - "CONTENT_SECURITY_POLICY=${CONTENT_SECURITY_POLICY}"
   
   misp-modules:
     image: ghcr.io/misp/misp-docker/misp-modules:${MODULES_RUNNING_TAG:-latest}

template.env

@@ -199,3 +199,15 @@ SYNCSERVERS_1_PULL_RULES=
 # NGINX_X_FORWARDED_FOR=true
 # Comma separated list of trusted IP addresses
 # NGINX_SET_REAL_IP_FROM=127.0.0.1
+
+# Security Settings
+# Maximum time (in seconds) for HSTS (HTTP Strict Transport Security), ensures HTTPS is used.
+HSTS_MAX_AGE=
+
+# X-Frame-Options policy configuration: controls whether the site can be embedded in frames or iframes.
+# Options: DENY, SAMEORIGIN, ALLOW-FROM <URL> Default: SAMEORIGIN
+X_FRAME_OPTIONS=""
+
+# Content-Security-Policy (CSP) configuration: defines allowed resources and prevents attacks like XSS.
+# Example: "frame-src 'self' https://*.example.com; frame-ancestors 'self' https://*.example.com; object-src 'none'; report-uri https://example.com/cspReport"
+CONTENT_SECURITY_POLICY=""