Upload end-sem pyq for CSDF, november-december 2025. Provided by Ayush Kalaskar.

Codes/Code-1.1.py

@@ -0,0 +1,426 @@
+#!/usr/bin/env python3
+
+# CSDF - Practical-1 (Email Header Analysis)
+
+"""
+THIS CODE HAS BEEN TESTED AND IS FULLY OPERATIONAL.
+
+Problem Statement: Email Header Analysis - Write a program for Tracking Emails and Investigating Email Crimes. i.e. Write a program to analyze e–mail header.
+
+Code from CyberSecurityAndDigitalForensics (SPPU - Final Year - Computer Engineering - Content) repository on KSKA Git: https://git.kska.io/sppu-be-comp-content/CyberSecurityAndDigitalForensics
+"""
+
+# BEGINNING OF CODE
+import re
+import json
+from email import message_from_string, message_from_file
+from email.parser import Parser
+from datetime import datetime
+import socket
+import ipaddress
+
+class EmailHeaderAnalyzer:
+    """
+    A comprehensive email header analyzer for forensic investigation
+    """
+    
+    def __init__(self, email_content):
+        """
+        Initialize the analyzer with email content
+        
+        Args:
+            email_content: Raw email string or file object
+        """
+        if isinstance(email_content, str):
+            self.email = message_from_string(email_content)
+        else:
+            self.email = message_from_file(email_content)
+        
+        self.analysis_results = {}
+    
+    def extract_basic_headers(self):
+        """Extract basic email header information"""
+        headers = {
+            'From': self.email.get('From', 'Not Found'),
+            'To': self.email.get('To', 'Not Found'),
+            'Subject': self.email.get('Subject', 'Not Found'),
+            'Date': self.email.get('Date', 'Not Found'),
+            'Message-ID': self.email.get('Message-ID', 'Not Found'),
+            'Return-Path': self.email.get('Return-Path', 'Not Found'),
+            'Reply-To': self.email.get('Reply-To', 'Not Found'),
+            'MIME-Version': self.email.get('MIME-Version', 'Not Found'),
+            'Content-Type': self.email.get('Content-Type', 'Not Found')
+        }
+        
+        self.analysis_results['basic_headers'] = headers
+        return headers
+    
+    def extract_received_headers(self):
+        """
+        Extract and parse all 'Received' headers to trace email path
+        Critical for tracking email transmission route
+        """
+        received_headers = self.email.get_all('Received', [])
+        parsed_received = []
+        
+        for idx, received in enumerate(received_headers):
+            hop_info = {
+                'hop_number': idx + 1,
+                'raw_header': received,
+                'timestamp': self._extract_timestamp(received),
+                'from_server': self._extract_from_server(received),
+                'by_server': self._extract_by_server(received),
+                'ip_address': self._extract_ip_from_received(received)
+            }
+            parsed_received.append(hop_info)
+        
+        self.analysis_results['received_headers'] = parsed_received
+        return parsed_received
+    
+    def extract_originating_ip(self):
+        """
+        Extract the originating IP address (X-Originating-IP)
+        This is crucial for tracing the actual sender location
+        """
+        originating_ip = self.email.get('X-Originating-IP', None)
+        
+        if originating_ip:
+            # Clean up IP address (remove brackets if present)
+            originating_ip = re.search(r'(\d+\.\d+\.\d+\.\d+)', originating_ip)
+            if originating_ip:
+                originating_ip = originating_ip.group(1)
+        
+        # If X-Originating-IP not found, try to get from first Received header
+        if not originating_ip:
+            received_headers = self.email.get_all('Received', [])
+            if received_headers:
+                originating_ip = self._extract_ip_from_received(received_headers[-1])
+        
+        self.analysis_results['originating_ip'] = originating_ip
+        return originating_ip
+    
+    def analyze_authentication(self):
+        """
+        Analyze email authentication headers (SPF, DKIM, DMARC)
+        Helps detect spoofing and verify email authenticity
+        """
+        auth_results = {
+            'SPF': self.email.get('Received-SPF', 'Not Found'),
+            'DKIM-Signature': self.email.get('DKIM-Signature', 'Not Found'),
+            'Authentication-Results': self.email.get('Authentication-Results', 'Not Found'),
+            'ARC-Authentication-Results': self.email.get('ARC-Authentication-Results', 'Not Found')
+        }
+        
+        # Determine if email passed authentication
+        spf_pass = 'pass' in str(auth_results['SPF']).lower()
+        dkim_pass = 'DKIM-Signature' in str(auth_results['DKIM-Signature'])
+        
+        auth_results['spf_passed'] = spf_pass
+        auth_results['dkim_present'] = dkim_pass
+        auth_results['likely_spoofed'] = not (spf_pass or dkim_pass)
+        
+        self.analysis_results['authentication'] = auth_results
+        return auth_results
+    
+    def extract_message_id(self):
+        """
+        Extract and analyze Message-ID
+        Useful for tracking email threads and identifying patterns
+        """
+        message_id = self.email.get('Message-ID', 'Not Found')
+        
+        # Extract domain from Message-ID
+        domain = None
+        if message_id != 'Not Found':
+            domain_match = re.search(r'@([a-zA-Z0-9.-]+)', message_id)
+            if domain_match:
+                domain = domain_match.group(1)
+        
+        message_id_info = {
+            'message_id': message_id,
+            'domain': domain
+        }
+        
+        self.analysis_results['message_id_info'] = message_id_info
+        return message_id_info
+    
+    def analyze_sender_info(self):
+        """
+        Detailed analysis of sender information
+        Extracts email addresses and identifies potential spoofing
+        """
+        from_header = self.email.get('From', '')
+        return_path = self.email.get('Return-Path', '')
+        
+        # Extract email addresses
+        from_email = self._extract_email_address(from_header)
+        return_email = self._extract_email_address(return_path)
+        
+        # Check for mismatch (potential spoofing indicator)
+        mismatch = from_email != return_email if from_email and return_email else False
+        
+        sender_info = {
+            'from_header': from_header,
+            'from_email': from_email,
+            'return_path': return_path,
+            'return_email': return_email,
+            'address_mismatch': mismatch,
+            'potential_spoofing': mismatch
+        }
+        
+        self.analysis_results['sender_analysis'] = sender_info
+        return sender_info
+    
+    def get_ip_geolocation_info(self, ip_address):
+        """
+        Get basic information about an IP address
+        Note: For production, integrate with geolocation APIs
+        """
+        try:
+            ip_obj = ipaddress.ip_address(ip_address)
+            ip_info = {
+                'ip': ip_address,
+                'is_private': ip_obj.is_private,
+                'is_global': ip_obj.is_global,
+                'is_loopback': ip_obj.is_loopback,
+                'version': ip_obj.version
+            }
+            
+            # Try reverse DNS lookup
+            try:
+                hostname = socket.gethostbyaddr(ip_address)[0]
+                ip_info['hostname'] = hostname
+            except:
+                ip_info['hostname'] = 'Reverse DNS lookup failed'
+            
+            return ip_info
+        except ValueError:
+            return {'error': 'Invalid IP address'}
+    
+    def detect_suspicious_patterns(self):
+        """
+        Detect common patterns associated with email crimes
+        """
+        suspicious_indicators = []
+        
+        # Check for authentication failures
+        if self.analysis_results.get('authentication', {}).get('likely_spoofed'):
+            suspicious_indicators.append('Email failed authentication checks (SPF/DKIM)')
+        
+        # Check for sender/return-path mismatch
+        if self.analysis_results.get('sender_analysis', {}).get('potential_spoofing'):
+            suspicious_indicators.append('Mismatch between From and Return-Path addresses')
+        
+        # Check for missing Message-ID
+        if self.analysis_results.get('message_id_info', {}).get('message_id') == 'Not Found':
+            suspicious_indicators.append('Missing Message-ID (unusual for legitimate emails)')
+        
+        # Check for suspicious keywords in subject
+        subject = self.email.get('Subject', '').lower()
+        suspicious_keywords = ['urgent', 'verify account', 'suspended', 'confirm', 'prize', 'winner']
+        found_keywords = [kw for kw in suspicious_keywords if kw in subject]
+        if found_keywords:
+            suspicious_indicators.append(f'Suspicious keywords in subject: {", ".join(found_keywords)}')
+        
+        self.analysis_results['suspicious_indicators'] = suspicious_indicators
+        return suspicious_indicators
+    
+    def generate_forensic_report(self):
+        """
+        Generate a comprehensive forensic analysis report
+        """
+        # Run all analysis methods
+        self.extract_basic_headers()
+        self.extract_received_headers()
+        self.extract_originating_ip()
+        self.analyze_authentication()
+        self.extract_message_id()
+        self.analyze_sender_info()
+        self.detect_suspicious_patterns()
+        
+        # Analyze originating IP if available
+        orig_ip = self.analysis_results.get('originating_ip')
+        if orig_ip:
+            self.analysis_results['ip_analysis'] = self.get_ip_geolocation_info(orig_ip)
+        
+        return self.analysis_results
+    
+    def print_report(self):
+        """Print a formatted forensic report"""
+        report = self.generate_forensic_report()
+        
+        print("="*80)
+        print(" EMAIL FORENSIC ANALYSIS REPORT ".center(80, "="))
+        print("="*80)
+        print(f"\nGenerated: {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}\n")
+        
+        # Basic Headers
+        print("\n" + "="*80)
+        print("1. BASIC HEADER INFORMATION")
+        print("="*80)
+        for key, value in report['basic_headers'].items():
+            print(f"{key:20s}: {value}")
+        
+        # Sender Analysis
+        print("\n" + "="*80)
+        print("2. SENDER ANALYSIS")
+        print("="*80)
+        sender = report.get('sender_analysis', {})
+        print(f"From Email          : {sender.get('from_email', 'N/A')}")
+        print(f"Return Email        : {sender.get('return_email', 'N/A')}")
+        print(f"Address Mismatch    : {sender.get('address_mismatch', False)}")
+        print(f"Potential Spoofing  : {sender.get('potential_spoofing', False)}")
+        
+        # Authentication
+        print("\n" + "="*80)
+        print("3. AUTHENTICATION ANALYSIS")
+        print("="*80)
+        auth = report.get('authentication', {})
+        print(f"SPF Passed          : {auth.get('spf_passed', False)}")
+        print(f"DKIM Present        : {auth.get('dkim_present', False)}")
+        print(f"Likely Spoofed      : {auth.get('likely_spoofed', True)}")
+        
+        # Message ID
+        print("\n" + "="*80)
+        print("4. MESSAGE ID ANALYSIS")
+        print("="*80)
+        msg_id = report.get('message_id_info', {})
+        print(f"Message ID          : {msg_id.get('message_id', 'N/A')}")
+        print(f"Domain              : {msg_id.get('domain', 'N/A')}")
+        
+        # Originating IP
+        print("\n" + "="*80)
+        print("5. ORIGINATING IP INFORMATION")
+        print("="*80)
+        print(f"Originating IP      : {report.get('originating_ip', 'Not Found')}")
+        
+        if 'ip_analysis' in report:
+            ip_info = report['ip_analysis']
+            print(f"IP Version          : IPv{ip_info.get('version', 'N/A')}")
+            print(f"Is Private          : {ip_info.get('is_private', 'N/A')}")
+            print(f"Is Global           : {ip_info.get('is_global', 'N/A')}")
+            print(f"Hostname            : {ip_info.get('hostname', 'N/A')}")
+        
+        # Transmission Path
+        print("\n" + "="*80)
+        print("6. EMAIL TRANSMISSION PATH")
+        print("="*80)
+        received = report.get('received_headers', [])
+        if received:
+            for hop in received:
+                print(f"\nHop {hop['hop_number']}:")
+                print(f"  From Server   : {hop.get('from_server', 'N/A')}")
+                print(f"  By Server     : {hop.get('by_server', 'N/A')}")
+                print(f"  IP Address    : {hop.get('ip_address', 'N/A')}")
+                print(f"  Timestamp     : {hop.get('timestamp', 'N/A')}")
+        else:
+            print("No Received headers found")
+        
+        # Suspicious Indicators
+        print("\n" + "="*80)
+        print("7. SUSPICIOUS INDICATORS")
+        print("="*80)
+        indicators = report.get('suspicious_indicators', [])
+        if indicators:
+            for idx, indicator in enumerate(indicators, 1):
+                print(f"{idx}. {indicator}")
+        else:
+            print("No suspicious indicators detected")
+        
+        print("\n" + "="*80)
+        print(" END OF REPORT ".center(80, "="))
+        print("="*80)
+    
+    def export_json(self, filename='email_analysis.json'):
+        """Export analysis results to JSON file"""
+        report = self.generate_forensic_report()
+        with open(filename, 'w') as f:
+            json.dump(report, f, indent=4)
+        print(f"\nAnalysis exported to {filename}")
+    
+    # Helper methods
+    def _extract_timestamp(self, received_header):
+        """Extract timestamp from Received header"""
+        timestamp_match = re.search(r';\s*(.+)$', received_header)
+        return timestamp_match.group(1).strip() if timestamp_match else 'Not Found'
+    
+    def _extract_from_server(self, received_header):
+        """Extract 'from' server information"""
+        from_match = re.search(r'from\s+([^\s]+)', received_header, re.IGNORECASE)
+        return from_match.group(1) if from_match else 'Not Found'
+    
+    def _extract_by_server(self, received_header):
+        """Extract 'by' server information"""
+        by_match = re.search(r'by\s+([^\s]+)', received_header, re.IGNORECASE)
+        return by_match.group(1) if by_match else 'Not Found'
+    
+    def _extract_ip_from_received(self, received_header):
+        """Extract IP address from Received header"""
+        ip_match = re.search(r'\[(\d+\.\d+\.\d+\.\d+)\]', received_header)
+        return ip_match.group(1) if ip_match else 'Not Found'
+    
+    def _extract_email_address(self, header_value):
+        """Extract email address from header value"""
+        email_match = re.search(r'[\w\.-]+@[\w\.-]+\.\w+', header_value)
+        return email_match.group(0) if email_match else None
+
+
+def main():
+    """
+    Main function to demonstrate email header analysis
+    """
+    print("Email Header Analysis Tool for Digital Forensics\n")
+    print("Choose input method:")
+    print("1. Paste raw email content")
+    print("2. Load from file")
+    print("3. Use sample email")
+    
+    choice = input("\nEnter choice (1-3): ").strip()
+    
+    if choice == '1':
+        print("\nPaste the raw email (including headers). Press Ctrl+D (Linux/MacOS) or Ctrl+Z (Windows) when done: ")
+        import sys
+        email_content = sys.stdin.read()
+    
+    elif choice == '2':
+        filename = input("Enter email file path: ").strip()
+        try:
+            with open(filename, 'r') as f:
+                email_content = f.read()
+        except FileNotFoundError:
+            print(f"Error: File '{filename}' not found")
+            return
+    
+    else:
+        # Sample email for demonstration
+        email_content = """From: sender@example.com
+To: recipient@example.com
+Subject: Urgent Account Verification Required
+Date: Mon, 9 Oct 2025 10:30:00 +0530
+Message-ID: <12345.67890@mail.example.com>
+Return-Path: different@suspicious.com
+Received: from mail.example.com ([192.168.1.100]) by server.example.com with SMTP; Mon, 9 Oct 2025 10:30:00 +0530
+Received: from client.suspicious.com ([203.0.113.45]) by mail.example.com with ESMTP; Mon, 9 Oct 2025 10:29:55 +0530
+X-Originating-IP: [203.0.113.45]
+MIME-Version: 1.0
+Content-Type: text/plain; charset=utf-8
+
+This is a sample email body for forensic analysis.
+"""
+    
+    # Create analyzer instance and generate report
+    analyzer = EmailHeaderAnalyzer(email_content)
+    analyzer.print_report()
+    
+    # Ask if user wants to export to JSON
+    export = input("\nExport analysis to JSON? (y/n): ").strip().lower()
+    if export == 'y':
+        filename = input("Enter filename (default: email_analysis.json): ").strip()
+        if not filename:
+            filename = 'email_analysis.json'
+        analyzer.export_json(filename)
+
+
+if __name__ == "__main__":
+    main()
+# END OF CODE

Codes/Code-1.2.py

@@ -0,0 +1,236 @@
+# CSDF - Practical-1 (Email Header Analysis)
+
+"""
+THIS CODE HAS BEEN TESTED AND IS FULLY OPERATIONAL.
+
+Problem Statement: CAPTCHA image - Implement a program to generate and verify CAPTCHA image.
+
+Code from CyberSecurityAndDigitalForensics (SPPU - Final Year - Computer Engineering - Content) repository on KSKA Git: https://git.kska.io/sppu-be-comp-content/CyberSecurityAndDigitalForensics
+"""
+
+# BEGINNING OF CODE
+import random
+import string
+from captcha.image import ImageCaptcha
+from PIL import Image
+import hashlib
+import time
+import os
+
+class CaptchaManager:
+    """
+    A comprehensive CAPTCHA generation and verification system
+    """
+    
+    def __init__(self, length=6, width=280, height=90):
+        """
+        Initialize the CAPTCHA manager
+        
+        Args:
+            length: Number of characters in CAPTCHA
+            width: Image width in pixels
+            height: Image height in pixels
+        """
+        self.length = length
+        self.image_captcha = ImageCaptcha(width=width, height=height)
+        self.captcha_store = {}  # Store CAPTCHA with expiry time
+        self.expiry_time = 180  # 3 minutes in seconds
+        
+    def generate_captcha_text(self):
+        """
+        Generate random CAPTCHA text
+        
+        Returns:
+            String of random alphanumeric characters
+        """
+        characters = string.ascii_uppercase + string.digits
+        # Exclude ambiguous characters like 0, O, I, 1
+        characters = characters.replace('0', '').replace('O', '').replace('I', '').replace('1', '')
+        captcha_text = ''.join(random.choice(characters) for _ in range(self.length))
+        return captcha_text
+    
+    def generate_captcha_image(self, captcha_text=None, filename='captcha.png'):
+        """
+        Generate CAPTCHA image
+        
+        Args:
+            captcha_text: Text to display (auto-generated if None)
+            filename: Output filename
+            
+        Returns:
+            Tuple of (captcha_text, session_id, filename)
+        """
+        if captcha_text is None:
+            captcha_text = self.generate_captcha_text()
+        
+        # Generate image
+        data = self.image_captcha.generate(captcha_text)
+        self.image_captcha.write(captcha_text, filename)
+        
+        # Create session ID
+        session_id = hashlib.md5(
+            f"{captcha_text}{time.time()}".encode()
+        ).hexdigest()
+        
+        # Store CAPTCHA with expiry time
+        self.captcha_store[session_id] = {
+            'text': captcha_text,
+            'timestamp': time.time()
+        }
+        
+        return captcha_text, session_id, filename
+    
+    def verify_captcha(self, session_id, user_input):
+        """
+        Verify user's CAPTCHA input
+        
+        Args:
+            session_id: Unique session identifier
+            user_input: User's input text
+            
+        Returns:
+            Dictionary with verification result
+        """
+        # Check if session exists
+        if session_id not in self.captcha_store:
+            return {
+                'success': False,
+                'message': 'Invalid session or CAPTCHA expired'
+            }
+        
+        captcha_data = self.captcha_store[session_id]
+        current_time = time.time()
+        
+        # Check expiry
+        if current_time - captcha_data['timestamp'] > self.expiry_time:
+            del self.captcha_store[session_id]
+            return {
+                'success': False,
+                'message': 'CAPTCHA expired. Please try again.'
+            }
+        
+        # Verify CAPTCHA (case-insensitive)
+        if user_input.upper() == captcha_data['text'].upper():
+            del self.captcha_store[session_id]  # Remove after successful verification
+            return {
+                'success': True,
+                'message': 'CAPTCHA verified successfully!'
+            }
+        else:
+            return {
+                'success': False,
+                'message': 'Incorrect CAPTCHA. Please try again.'
+            }
+    
+    def cleanup_expired(self):
+        """
+        Remove expired CAPTCHAs from storage
+        """
+        current_time = time.time()
+        expired_sessions = [
+            sid for sid, data in self.captcha_store.items()
+            if current_time - data['timestamp'] > self.expiry_time
+        ]
+        for sid in expired_sessions:
+            del self.captcha_store[sid]
+
+
+# Alternative simple implementation using Pillow
+class SimpleCaptcha:
+    """
+    Simple CAPTCHA implementation using Pillow
+    """
+    
+    @staticmethod
+    def generate(length=6):
+        """
+        Generate simple CAPTCHA with noise
+        
+        Returns:
+            Tuple of (captcha_text, Image object)
+        """
+        from PIL import ImageDraw, ImageFont
+        
+        # Generate random text
+        chars = ''.join(random.choice(string.ascii_uppercase + string.digits) 
+                       for _ in range(length))
+        
+        # Create image
+        img = Image.new('RGB', (200, 100), color=(73, 109, 137))
+        draw = ImageDraw.Draw(img)
+        
+        # Try to load a font, fallback to default if not available
+        try:
+            font = ImageFont.truetype('arial.ttf', 36)
+        except:
+            font = ImageFont.load_default()
+        
+        # Draw characters with random positions
+        x = 20
+        for char in chars:
+            y = random.randint(25, 35)
+            draw.text((x, y), char, font=font, fill=(255, 255, 0))
+            x += 30
+        
+        # Add noise (dots)
+        for _ in range(150):
+            x = random.randint(0, 200)
+            y = random.randint(0, 100)
+            draw.point((x, y), fill=(random.randint(0, 255), 
+                                    random.randint(0, 255), 
+                                    random.randint(0, 255)))
+        
+        # Add lines for distortion
+        for _ in range(5):
+            start = (random.randint(0, 200), random.randint(0, 100))
+            end = (random.randint(0, 200), random.randint(0, 100))
+            draw.line([start, end], fill=(255, 255, 255), width=1)
+        
+        return chars, img
+
+
+# Example usage and testing
+def main():
+    """
+    Demonstration of CAPTCHA generation and verification
+    """
+    print("=== CAPTCHA Generation and Verification Demo ===\n")
+    
+    # Initialize CAPTCHA manager
+    manager = CaptchaManager(length=6)
+    
+    # Generate CAPTCHA
+    captcha_text, session_id, filename = manager.generate_captcha_image()
+    print(f"CAPTCHA Generated: {captcha_text}")
+    print(f"Session ID: {session_id}")
+    print(f"Image saved as: {filename}\n")
+    
+    # Simulate user input
+    print("Verification Tests:")
+    
+    # Test 1: Correct input
+    result = manager.verify_captcha(session_id, captcha_text)
+    print(f"Test 1 (Correct): {result}")
+    
+    # Generate new CAPTCHA for next test
+    captcha_text, session_id, _ = manager.generate_captcha_image('test_captcha_2.png')
+    
+    # Test 2: Incorrect input
+    result = manager.verify_captcha(session_id, "WRONG")
+    print(f"Test 2 (Incorrect): {result}")
+    
+    # Test 3: Invalid session
+    result = manager.verify_captcha("invalid_session", "TEST")
+    print(f"Test 3 (Invalid Session): {result}")
+    
+    # Demonstrate simple CAPTCHA
+    print("\n=== Simple CAPTCHA Demo ===")
+    captcha_text, img = SimpleCaptcha.generate()
+    img.save('simple_captcha.png')
+    print(f"Simple CAPTCHA Text: {captcha_text}")
+    print("Image saved as: simple_captcha.png")
+
+
+if __name__ == "__main__":
+    main()
+# END OF CODE

README.md

@@ -10,9 +10,13 @@ This repository contains essential resources for the Cyber Security and Digital
 
 1. [Unit 1 - Introduction to Cyber Security](Notes/Unit%201%20-%20Introduction%20to%20Cyber%20Security)
 2. [Unit 2 - Cyber Crime Issues and Cyber Attacks](Notes/Unit%202%20-%20Cyber%20Crime%20Issues%20and%20Cyber%20Attacks)
+3. [Unit 3 - 6](Notes/CSDF%20-%20Unit%203-6%20-%20Notes.pdf) *(provided by faculty)*
 
 ### Codes
 
+1. [Code-1.1 - Email Header Analysis](Codes/Code-1.1.py)
+2. [Code-1.2 - CAPTCHA Image](Codes/Code-1.2.py)
+
 ### Assignments
 
 1. Assignment - Unit 5:
@@ -36,6 +40,7 @@ This repository contains essential resources for the Cyber Security and Digital
 - [END-SEM](Question%20Papers/END-SEM)
 
 ### [IN-SEM PYQ Answers](Notes/IN-SEM%20PYQ%20Answers)
+### [END-SEM PYQ Answers](Notes/END-SEM%20PYQ%20Answers)
 
 ---