Rollback and Recovery Procedures

Rollback and Recovery Procedures

Having robust rollback procedures ensures you can quickly recover if CSP causes critical issues:

// CSP Rollback and Recovery System
class CSPRollbackSystem {
  constructor() {
    this.policies = new Map();
    this.metrics = new Map();
  }
  
  createRollbackProcedures() {
    return {
      automatic: {
        triggers: [
          {
            metric: 'error_rate',
            threshold: 0.05, // 5% error rate
            action: 'immediate_rollback'
          },
          {
            metric: 'conversion_rate_drop',
            threshold: 0.2, // 20% drop
            action: 'alert_and_rollback'
          },
          {
            metric: 'support_tickets',
            threshold: 10, // 10 CSP-related tickets/hour
            action: 'investigate_and_rollback'
          }
        ],
        
        implementation: `
          class AutomaticRollback {
            constructor() {
              this.monitoring = setInterval(() => this.checkTriggers(), 60000);
            }
            
            async checkTriggers() {
              const metrics = await this.gatherMetrics();
              
              for (const trigger of this.triggers) {
                if (metrics[trigger.metric] > trigger.threshold) {
                  await this.executeRollback(trigger);
                  break;
                }
              }
            }
            
            async executeRollback(trigger) {
              console.error(\`Rollback triggered: \${trigger.metric} exceeded threshold\`);
              
              // Switch to safe policy
              await this.applySafePolicy();
              
              // Notify team
              await this.notifyTeam(trigger);
              
              // Log incident
              await this.logIncident(trigger);
            }
            
            async applySafePolicy() {
              // Revert to report-only mode
              app.use((req, res, next) => {
                res.setHeader('Content-Security-Policy-Report-Only', 
                  "default-src * 'unsafe-inline' 'unsafe-eval'; report-uri /csp-reports"
                );
                next();
              });
            }
          }
        `
      },
      
      manual: {
        procedures: [
          {
            step: 1,
            action: 'Identify issue severity',
            details: 'Check monitoring dashboards for impact scope'
          },
          {
            step: 2,
            action: 'Execute rollback if critical',
            command: 'npm run csp:rollback'
          },
          {
            step: 3,
            action: 'Notify stakeholders',
            template: 'CSP rollback executed due to [ISSUE]'
          },
          {
            step: 4,
            action: 'Begin root cause analysis',
            tools: ['Violation logs', 'Error tracking', 'User reports']
          }
        ]
      }
    };
  }
}

Migrating legacy applications to CSP requires patience, systematic planning, and careful execution. By following a phased approach, modernizing problematic code patterns, and maintaining robust testing and rollback procedures, organizations can successfully implement CSP even in complex legacy environments. The key is to view migration not as a single project but as an ongoing modernization effort that improves both security and code quality. With proper planning and execution, even the most challenging legacy applications can benefit from the security enhancements that CSP provides.## CSP Performance Impact and Optimization

Content Security Policy implementation can affect web application performance in various ways, from header parsing overhead to resource loading delays. Understanding these impacts and implementing optimization strategies ensures that security enhancements don't come at the cost of user experience. This comprehensive guide explores CSP performance considerations, measurement techniques, and optimization strategies for maintaining fast, secure web applications.