Show HN: SSL Certificate Checker – CLI tool for checking multiple domains

4 months ago 3

A modern, colorful command-line tool to monitor SSL certificate expiration for multiple domains with concurrent checking and beautiful output.

📁 One file only - Everything in a single sslcheck.py script
📦 Minimal dependencies - Only requires pyOpenSSL (plus Python standard library)
⚡ Zero configuration - Works out of the box
🔧 Easy deployment - Just copy the file and run!

🚀 Concurrent Processing - Check multiple domains simultaneously for faster results
🎨 Colorful Output - Beautiful terminal output with colors and emojis
📊 Progress Indicators - Real-time progress bar during certificate checks
⚙️ Configurable - Customizable expiration thresholds and ports
📝 Detailed Reporting - Comprehensive summary with statistics
🔧 Error Handling - Robust error handling with clear error messages
📄 Sample Generator - Built-in sample domains file generator

# 1. Download the single file wget https://raw.githubusercontent.com/your-repo/sslcheck.py # 2. Install the only dependency pip install pyOpenSSL # 3. Make it executable (optional) chmod +x sslcheck.py # 4. Ready to use! python sslcheck.py --create-sample

Python 3.6+ (standard library modules included)
pyOpenSSL - The only external dependency for certificate parsing
That's it! 🎉

# Check domains from file python sslcheck.py -f domains.txt # Create sample domains file python sslcheck.py --create-sample # Check with custom threshold (30 days) python sslcheck.py -f domains.txt -t 30 # Check on custom port python sslcheck.py -f domains.txt -p 8443 # Use more workers for faster processing python sslcheck.py -f domains.txt -w 20 # Disable colors for scripting python sslcheck.py -f domains.txt --no-color

Option Description Default

-f, --file	File containing list of domains (one per line)	Required
-t, --threshold	Days threshold to consider as expiring soon	15
-p, --port	SSL port to check	443
-w, --workers	Number of concurrent workers	10
--create-sample	Create sample 'domains.txt' file	-
--no-color	Disable colored output	-
--help	Show help message	-

Create a text file with one domain per line:

google.com github.com stackoverflow.com example.com

🔒 SSL Certificate Checker 📋 Checking 5 domain(s) on port 443 ⚠️ Warning threshold: 15 days 👥 Using 10 concurrent workers ════════════════════════════════════════════════════════════════════════════════ 🚀 Starting certificate checks... Progress: [████████████████████████████████████████] 100.0% (5/5) ════════════════════════════════════════════════════════════════════════════════ 📊 RESULTS ════════════════════════════════════════════════════════════════════════════════ 🟢 google.com VALID Expires: 2024-03-15 (89 days) 🟡 example.com EXPIRING SOON Expires: 2024-01-20 (10 days) 🔴 expired.badssl.com EXPIRED Expires: 2023-12-01 (-25 days) ❌ nonexistent.domain.com ERROR [Errno -5] No address associated with hostname ════════════════════════════════════════════════════════════════════════════════ 📈 SUMMARY 🟢 Valid: 1 🟡 Expiring Soon: 1 🔴 Expired: 1 ❌ Errors: 1 ════════════════════════════════════════════════════════════════════════════════

🚀 Performance & Architecture

Concurrent Processing: Uses ThreadPoolExecutor for parallel certificate checks
Configurable Workers: Adjust the number of concurrent workers based on your needs
Progress Tracking: Real-time progress indicator shows completion status
Efficient Sorting: Results are sorted by expiration status for easy review
Lightweight Design: Single file with minimal footprint
No External Services: Direct SSL connection testing without third-party APIs

"No address associated with hostname"
- The domain doesn't exist or has DNS issues
- Check domain spelling and DNS resolution
Connection timeouts
- Domain might be blocking connections
- Try reducing the number of workers with -w
SSL errors
- Certificate might be invalid or self-signed
- Port might be incorrect (try -p 8443 for non-standard ports)