Dynamic Application Security Testing (DAST)

Dynamic Application Security Testing (DAST)

DAST tests the running application to identify vulnerabilities in real-world scenarios.

// Android - Dynamic security testing framework
import android.app.Application
import android.content.Context
import android.net.TrafficStats
import android.os.Debug
import java.net.HttpURLConnection
import java.net.URL
import javax.net.ssl.*

class DynamicSecurityTester(private val context: Context) {
    
    // Monitor network traffic for security issues
    class NetworkTrafficMonitor {
        private var startTxBytes: Long = 0
        private var startRxBytes: Long = 0
        private val uid = android.os.Process.myUid()
        
        fun startMonitoring() {
            startTxBytes = TrafficStats.getUidTxBytes(uid)
            startRxBytes = TrafficStats.getUidRxBytes(uid)
        }
        
        fun getTrafficReport(): TrafficReport {
            val currentTx = TrafficStats.getUidTxBytes(uid)
            val currentRx = TrafficStats.getUidRxBytes(uid)
            
            return TrafficReport(
                bytesSent = currentTx - startTxBytes,
                bytesReceived = currentRx - startRxBytes,
                connections = analyzeConnections()
            )
        }
        
        private fun analyzeConnections(): List<ConnectionInfo> {
            // Analyze active connections
            val connections = mutableListOf<ConnectionInfo>()
            
            // This would normally use more sophisticated network monitoring
            // For demonstration purposes, we'll check system properties
            val httpProxy = System.getProperty("http.proxyHost")
            val httpsProxy = System.getProperty("https.proxyHost")
            
            if (!httpProxy.isNullOrEmpty()) {
                connections.add(ConnectionInfo(
                    type = "HTTP Proxy",
                    host = httpProxy,
                    secure = false
                ))
            }
            
            if (!httpsProxy.isNullOrEmpty()) {
                connections.add(ConnectionInfo(
                    type = "HTTPS Proxy",
                    host = httpsProxy,
                    secure = true
                ))
            }
            
            return connections
        }
        
        data class TrafficReport(
            val bytesSent: Long,
            val bytesReceived: Long,
            val connections: List<ConnectionInfo>
        )
        
        data class ConnectionInfo(
            val type: String,
            val host: String,
            val secure: Boolean
        )
    }
    
    // Test SSL/TLS implementation
    fun testSSLImplementation(url: String): SSLTestResult {
        return try {
            val connection = URL(url).openConnection() as HttpsURLConnection
            connection.connectTimeout = 5000
            connection.readTimeout = 5000
            
            // Get SSL session info
            connection.connect()
            val session = connection.sslSession
            
            val cipherSuite = session.cipherSuite
            val protocol = session.protocol
            val certificates = session.peerCertificates
            
            // Check for weak ciphers
            val isWeakCipher = isWeakCipherSuite(cipherSuite)
            
            // Check protocol version
            val isSecureProtocol = isSecureProtocol(protocol)
            
            // Check certificate validity
            val certIssues = analyzeCertificates(certificates)
            
            connection.disconnect()
            
            SSLTestResult(
                success = !isWeakCipher && isSecureProtocol && certIssues.isEmpty(),
                cipherSuite = cipherSuite,
                protocol = protocol,
                weakCipher = isWeakCipher,
                secureProtocol = isSecureProtocol,
                certificateIssues = certIssues
            )
        } catch (e: Exception) {
            SSLTestResult(
                success = false,
                error = e.message,
                certificateIssues = listOf("Connection failed: ${e.message}")
            )
        }
    }
    
    private fun isWeakCipherSuite(cipherSuite: String): Boolean {
        val weakCiphers = listOf(
            "SSL_RSA_WITH_RC4_128_MD5",
            "SSL_RSA_WITH_RC4_128_SHA",
            "TLS_RSA_WITH_AES_128_CBC_SHA",
            "TLS_RSA_WITH_AES_256_CBC_SHA",
            "SSL_RSA_WITH_3DES_EDE_CBC_SHA"
        )
        
        return weakCiphers.any { cipherSuite.contains(it) }
    }
    
    private fun isSecureProtocol(protocol: String): Boolean {
        return protocol == "TLSv1.2" || protocol == "TLSv1.3"
    }
    
    // Memory analysis for sensitive data
    fun performMemoryAnalysis(): MemoryAnalysisResult {
        val runtime = Runtime.getRuntime()
        val totalMemory = runtime.totalMemory()
        val freeMemory = runtime.freeMemory()
        val usedMemory = totalMemory - freeMemory
        
        // Check for debugger
        val isDebugged = Debug.isDebuggerConnected()
        
        // Analyze heap for sensitive patterns
        val sensitiveDataFound = analyzHeapForSensitiveData()
        
        return MemoryAnalysisResult(
            totalMemory = totalMemory,
            usedMemory = usedMemory,
            isDebugged = isDebugged,
            sensitiveDataInMemory = sensitiveDataFound
        )
    }
    
    private fun analyzHeapForSensitiveData(): List<String> {
        // This is a simplified example
        // Real implementation would use memory dumping tools
        val patterns = listOf(
            "password=",
            "api_key=",
            "credit_card",
            "ssn:",
            "secret_key"
        )
        
        // In practice, you'd analyze actual heap dumps
        return emptyList()
    }
    
    data class SSLTestResult(
        val success: Boolean,
        val cipherSuite: String? = null,
        val protocol: String? = null,
        val weakCipher: Boolean = false,
        val secureProtocol: Boolean = true,
        val certificateIssues: List<String> = emptyList(),
        val error: String? = null
    )
    
    data class MemoryAnalysisResult(
        val totalMemory: Long,
        val usedMemory: Long,
        val isDebugged: Boolean,
        val sensitiveDataInMemory: List<String>
    )
}