feat: implement non-root user security for Docker container

Dockerfile

@@ -17,9 +17,22 @@ RUN npm run build -- --mode production
 # Production stage
 FROM nginx:alpine
 
+ARG APP_USER_ID=1001
+ARG APP_GROUP_ID=1001
+
+RUN addgroup -g $APP_GROUP_ID bentopdf && \
+    adduser -u $APP_USER_ID -G bentopdf -D -s /bin/sh bentopdf
+
 COPY --from=builder /app/dist /usr/share/nginx/html
 COPY nginx.conf /etc/nginx/nginx.conf
 
+RUN mkdir -p /var/cache/nginx /var/log/nginx /var/run/nginx && \
+    chown -R bentopdf:bentopdf /usr/share/nginx/html /var/cache/nginx /var/log/nginx /var/run/nginx
+
+RUN sed -i 's/user nginx;/user bentopdf;/' /etc/nginx/nginx.conf
+
 EXPOSE 80
 
+USER bentopdf
+
 CMD ["nginx", "-g", "daemon off;"]

README.md

@@ -149,6 +149,27 @@ For organizations that want a clean, distraction-free interface focused solely o
 
 For more details, see [SIMPLE_MODE.md](SIMPLE_MODE.md).
 
+### 🔒 Security Features
+
+BentoPDF runs as a non-root user for enhanced security:
+
+- **Non-Root Execution**: Container runs with minimal privileges
+- **Configurable UID/GID**: Customize user/group IDs for your environment
+- **Security Best Practices**: Follows Principle of Least Privilege
+
+#### Custom User Configuration
+
+```bash
+docker build \
+  --build-arg APP_USER_ID=2000 \
+  --build-arg APP_GROUP_ID=2000 \
+  -t bentopdf .
+
+docker run -p 8080:80 bentopdf
+```
+
+For detailed security configuration, see [SECURITY.md](SECURITY.md).
+
 ### 📦 Version Management
 
 BentoPDF supports semantic versioning with multiple Docker tags:

SECURITY.md

@@ -0,0 +1,108 @@
+# Security Configuration
+
+## Non-Root User Support
+
+BentoPDF now supports running as a non-root user for enhanced security. This follows the Principle of Least Privilege and is essential for production environments.
+
+### Security Benefits
+
+- **Reduced Attack Surface**: If compromised, attackers won't have root privileges
+- **Compliance**: Meets security standards like SOC 2, PCI DSS
+- **Kubernetes/OpenShift Compatibility**: Works with security policies that require non-root execution
+- **System Protection**: Prevents system-wide damage if the application is compromised
+
+### Usage
+
+#### Default Configuration (UID/GID 1001)
+```bash
+docker build -t bentopdf .
+docker run -p 8080:80 bentopdf
+```
+
+#### Custom UID/GID
+```bash
+# Build with custom user/group IDs
+docker build \
+  --build-arg APP_USER_ID=2000 \
+  --build-arg APP_GROUP_ID=2000 \
+  -t bentopdf .
+
+# Run the container
+docker run -p 8080:80 bentopdf
+```
+
+#### Kubernetes Example
+```yaml
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: bentopdf
+spec:
+  template:
+    spec:
+      securityContext:
+        runAsNonRoot: true
+        runAsUser: 2000
+        runAsGroup: 2000
+      containers:
+      - name: bentopdf
+        image: bentopdf:latest
+        ports:
+        - containerPort: 80
+```
+
+#### Docker Compose Example
+```yaml
+version: '3.8'
+services:
+  bentopdf:
+    build:
+      context: .
+      dockerfile: Dockerfile
+      args:
+        APP_USER_ID: 2000
+        APP_GROUP_ID: 2000
+    ports:
+      - "8080:80"
+    security_opt:
+      - no-new-privileges:true
+```
+
+### Verification
+
+To verify the container is running as non-root:
+
+```bash
+# Check the user inside the container
+docker exec <container_id> whoami
+# Should output: bentopdf
+
+# Check the user ID
+docker exec <container_id> id
+# Should show UID/GID matching your configuration
+```
+
+### Security Best Practices
+
+1. **Use specific UID/GID**: Don't use 0 (root) or common system UIDs
+2. **Regular Updates**: Keep the base image updated
+3. **Minimal Permissions**: Only grant necessary file permissions
+4. **Security Scanning**: Regularly scan images for vulnerabilities
+5. **Network Policies**: Implement network segmentation
+
+### Troubleshooting
+
+If you encounter permission issues:
+
+1. **Check file ownership**: Ensure all application files are owned by the bentopdf user
+2. **Verify UID/GID**: Make sure the configured IDs don't conflict with host system
+3. **Directory permissions**: Ensure nginx can write to log and cache directories
+
+### Migration from Root
+
+If migrating from a root-based setup:
+
+1. Update your Dockerfile to use the new non-root configuration
+2. Rebuild your images with the new security settings
+3. Update your deployment configurations (Kubernetes, Docker Compose, etc.)
+4. Test thoroughly in a staging environment

docker-compose.dev.yml

@@ -3,6 +3,10 @@ services:
     build:
       context: .
       dockerfile: Dockerfile
+      args:
+        APP_USER_ID: 1001 // default value is 1001 can be customized to any other value
+        APP_GROUP_ID: 1001 // default value is 1001 can be customized to any other value
+        SIMPLE_MODE: false // false for default mode, true for simple mode
     container_name: bentopdf
     ports:
       - '3000:80'

nginx.conf

@@ -1,3 +1,5 @@
+pid /var/run/nginx/nginx.pid;
+
 events {
     worker_connections 1024;
 }