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Desktop Applications

This guide provides comprehensive examples for analyzing desktop applications with friTap, covering web browsers, email clients, and other common desktop software.

Web Browsers

Firefox Analysis

Firefox is an excellent starting point for friTap analysis due to its widespread use and NSS library support.

Basic Key Extraction: 

# Start Firefox and extract TLS keys
sudo fritap -k firefox_keys.log firefox

# Expected output:
# [*] NSS found & will be hooked
# [*] Logging TLS keys to firefox_keys.log
# [*] Press Ctrl+C to stop

If you installed friTap as a normal user it might be the case that you have to invoke friTap like sudo -E fritap .....

Complete Traffic Analysis: 

# Capture both keys and decrypted traffic
sudo fritap -k firefox_keys.log --pcap firefox_traffic.pcap firefox

# Browse to various websites
# Press Ctrl+C to stop capture

Analysis with Wireshark: 

# Method 1: Use key log file
wireshark -o tls.keylog_file:firefox_keys.log network_capture.pcap

# Method 2: Open decrypted PCAP directly
wireshark firefox_traffic.pcap

Chrome/Chromium Analysis

Chrome uses BoringSSL, which has excellent friTap support.

Basic Analysis: 

# Extract keys from Chrome
sudo fritap -k chrome_keys.log google-chrome

# Or for Chromium
sudo fritap -k chromium_keys.log chromium-browser

Advanced Analysis with Debugging: 

# Enable verbose output for troubleshooting
sudo fritap -v -k chrome_keys.log --pcap chrome_traffic.pcap google-chrome

# Expected output includes:
# [*] BoringSSL found & will be hooked
# [*] Hooking SSL_read, SSL_write functions
# [*] Logging TLS keys to chrome_keys.log

Safari Analysis (macOS)

Safari analysis requires special considerations due to macOS security features.

Basic Safari Analysis: 

# May require SIP disabled
sudo fritap -k safari_keys.log Safari

# Alternative: Use process ID
sudo fritap -k safari_keys.log --pid $(pgrep Safari)

Troubleshooting Safari: 

# Enable debug output
sudo fritap -do -v Safari

# Check for library detection
sudo fritap --list-libraries Safari

Email Clients

Thunderbird Analysis

Thunderbird uses NSS for TLS operations, making it ideal for friTap analysis.

IMAP/SMTP Analysis: 

# Capture email traffic
sudo fritap -k thunderbird_keys.log --pcap thunderbird_traffic.pcap thunderbird

# Monitor specific protocols
tcpdump -r thunderbird_traffic.pcap 'port 993 or port 465'

Real-time Email Monitoring: 

# Live analysis
sudo fritap -l thunderbird

# Open Wireshark to view live traffic
# File → Open → Select named pipe

Outlook Analysis (Windows)

Outlook on Windows uses the system's SSL implementation.

Basic Outlook Analysis: 

# Run as Administrator
fritap -k outlook_keys.log outlook.exe

# Include debug information
fritap -do -v -k outlook_keys.log outlook.exe

Messaging Applications

Discord Analysis

Discord uses various SSL libraries depending on the platform.

Desktop Discord: 

# Linux
sudo fritap -k discord_keys.log --pcap discord_traffic.pcap discord

# Windows
fritap -k discord_keys.log discord.exe

# macOS
sudo fritap -k discord_keys.log Discord

Analysis Results: 

# View captured traffic
tcpdump -r discord_traffic.pcap

# Look for Discord API calls
tcpdump -r discord_traffic.pcap 'host discord.com'

Slack Analysis

Slack desktop applications typically use Electron with system SSL libraries.

Basic Slack Analysis: 

# Linux
sudo fritap -k slack_keys.log slack

# Windows
fritap -k slack_keys.log slack.exe

# macOS
sudo fritap -k slack_keys.log Slack

API Traffic Analysis: 

# Capture Slack API communications
sudo fritap --pcap slack_api.pcap slack

# Extract API calls
tcpdump -r slack_api.pcap 'host slack.com' -A

Development Tools

curl Analysis

curl is excellent for testing friTap functionality and understanding SSL/TLS behavior.

Basic curl Test: 

# Test with simple HTTPS request
sudo fritap -k curl_keys.log curl https://httpbin.org/get

# Expected output:
# [*] OpenSSL found & will be hooked
# [*] TLS key captured: CLIENT_RANDOM ...

Multiple Request Analysis: 

# Capture multiple curl requests
sudo fritap -k curl_keys.log --pcap curl_traffic.pcap bash -c '
  curl https://httpbin.org/get
  curl https://httpbin.org/post -d "test=data"
  curl https://httpbin.org/headers
'

wget Analysis

wget provides another good test case for OpenSSL hooking.

Basic wget Test: 

# Download with key extraction
sudo fritap -k wget_keys.log wget https://example.com/file.zip

# Verbose wget analysis
sudo fritap -v -k wget_keys.log wget -v https://example.com/file.zip

Custom Applications

Python Applications

Python applications using the requests library or urllib3.

requests Library: 

# Analyze Python script using requests
sudo fritap -k python_keys.log --pcap python_traffic.pcap python script.py

# Where script.py contains:
# import requests
# response = requests.get('https://httpbin.org/get')

urllib3 Analysis: 

# For applications using urllib3 directly
sudo fritap -k urllib3_keys.log python -c "
import urllib3
http = urllib3.PoolManager()
resp = http.request('GET', 'https://httpbin.org/get')
"

Java Applications

Java applications using various SSL providers.

Basic Java Analysis: 

# Analyze Java application
sudo fritap -k java_keys.log java -jar application.jar

# For applications using specific SSL providers
sudo fritap -k java_keys.log java -Djavax.net.ssl.keyStore=keystore.jks MyApp

.NET Applications

.NET applications on Linux (using Mono) or Windows.

Mono Analysis (Linux): 

# Analyze Mono application
sudo fritap -k mono_keys.log mono application.exe

Windows .NET Analysis: 

# Analyze .NET application
fritap -k dotnet_keys.log application.exe

Troubleshooting Desktop Applications

Common Issues

No SSL Library Detected: 

# Enable debug output to see library detection
sudo fritap -do -v target_app

# Check loaded libraries
sudo fritap --list-libraries target_app

No Traffic Captured: 

# Use default socket information
sudo fritap --enable_default_fd --pcap traffic.pcap target_app

# Enable spawn gating for child processes
sudo fritap --enable_spawn_gating --pcap traffic.pcap target_app

Permission Issues: 

# Ensure proper permissions
sudo fritap -k keys.log target_app

# Check process ownership
ps aux | grep target_app

Application-Specific Solutions

Browser Sandboxing: 

# Disable browser security features for analysis
google-chrome --no-sandbox --disable-web-security --user-data-dir=/tmp/chrome_test
sudo fritap -k chrome_keys.log google-chrome

Electron Applications: 

# Many desktop apps use Electron
sudo fritap -k electron_keys.log --pcap electron_traffic.pcap electron_app

# Enable additional debugging
sudo fritap -do -v electron_app

Advanced Desktop Analysis

Multi-Process Applications

Many desktop applications spawn multiple processes.

Capture All Processes: 

# Enable spawn gating to capture child processes
sudo fritap --enable_spawn_gating -k all_keys.log --pcap all_traffic.pcap parent_app

Pattern-Based Hooking

For applications with stripped SSL libraries.

Using Pattern Files: 

# Create pattern file for specific application
sudo fritap --patterns app_patterns.json -k keys.log target_app

Custom Scripts

Extend friTap with custom Frida scripts.

Custom Hook Script: 

# Use custom JavaScript for specific analysis
sudo fritap -c custom_hooks.js -k keys.log target_app

Analysis Workflows

Comprehensive Analysis Workflow

# Step 1: Basic key extraction
sudo fritap -k app_keys.log target_app

# Step 2: Add traffic capture
sudo fritap -k app_keys.log --pcap app_traffic.pcap target_app

# Step 3: Analyze with Wireshark
wireshark -o tls.keylog_file:app_keys.log app_traffic.pcap

# Step 4: Extract specific protocols
tcpdump -r app_traffic.pcap 'port 443' -w https_traffic.pcap

Automated Analysis

#!/bin/bash
# Automated desktop application analysis script

APP_NAME="$1"
OUTPUT_DIR="analysis_$(date +%Y%m%d_%H%M%S)"

mkdir -p "$OUTPUT_DIR"
cd "$OUTPUT_DIR"

echo "Starting analysis of $APP_NAME"

# Start friTap with comprehensive logging
sudo fritap -k "${APP_NAME}_keys.log" \
           --pcap "${APP_NAME}_traffic.pcap" \
           --json "${APP_NAME}_metadata.json" \
           -v "$APP_NAME" 2>&1 | tee "${APP_NAME}_analysis.log"

echo "Analysis complete. Results in $OUTPUT_DIR"

Performance Considerations

Resource Usage

Monitor friTap Performance: 

# Check memory usage
sudo fritap -k keys.log target_app &
FRITAP_PID=$!
watch -n 1 "ps -p $FRITAP_PID -o pid,ppid,cmd,%mem,%cpu"

Optimize for Large Applications: 

# Reduce overhead for resource-intensive apps
sudo fritap --buffer-size 512KB --timeout 60 -k keys.log target_app

Output Management

Manage Large Captures: 

# Rotate capture files
sudo fritap -k keys.log --pcap traffic.pcap --max-size 100MB target_app

# Compress old captures
gzip old_traffic.pcap

Best Practices

1. Test with Known Applications

Start with curl or wget to verify friTap is working: 

sudo fritap -k test_keys.log curl https://httpbin.org/get

2. Use Appropriate Privileges

Most desktop applications require root/admin privileges: 

# Linux/macOS
sudo fritap -k keys.log target_app

# Windows (run as Administrator)
fritap -k keys.log target_app

3. Enable Debugging for Troubleshooting

sudo fritap -do -v -k keys.log target_app 2>&1 | tee debug.log

4. Combine Multiple Analysis Methods

# Comprehensive analysis
sudo fritap -k keys.log --pcap traffic.pcap --json metadata.json target_app

5. Document Your Analysis

# Create analysis report
echo "Analysis of $APP_NAME on $(date)" > analysis_report.txt
echo "Command: fritap -k keys.log --pcap traffic.pcap $APP_NAME" >> analysis_report.txt
echo "Key count: $(grep -c CLIENT_RANDOM keys.log)" >> analysis_report.txt
echo "Traffic size: $(du -h traffic.pcap | cut -f1)" >> analysis_report.txt

Next Steps