SSL Checker

Python script that collects SSL/TLS information from hosts

About

It's a simple script running in Python that collects SSL/TLS information and then returns the group of information in JSON. It can also connect through your specified SOCKS server.

One of the good things about this script is that it will fully analyze the SSL certificate for security issues and include the report in the output, CSV, HTML, or JSON file.

Online API Based Version

You can simply go to https://ssl-checker.io or use the following curl command:

curl https://ssl-checker.io/api/v1/check/example.com

Requirements

pip install -r requirements.txt

Usage

./ssl_checker.py -h
usage: ssl_checker.py (-H [HOSTS [HOSTS ...]] | -f HOST_FILE) [-s HOST:PORT]
                      [-c FILENAME.CSV] [-j] [-S] [-x] [-J] [-a] [-v] [-h]

Collects useful information about the given host's SSL certificates.

optional arguments:
  -H [HOSTS [HOSTS ...]], --host [HOSTS [HOSTS ...]]
                        Hosts as input separated by space
  -f HOST_FILE, --host-file HOST_FILE
                        Hosts as input from a file
  -s HOST:PORT, --socks HOST:PORT
                        Enable SOCKS proxy for connection
  -c FILENAME.CSV, --csv FILENAME.CSV
                        Enable CSV file export
  -j, --json            Enable JSON in the output
  -S, --summary         Enable summary output only
  -x, --html            Enable HTML file export
  -J, --json-save       Enable JSON export individually per host
  -a, --analyze         Enable SSL security analysis on the host
  -v, --verbose         Enable verbose to see what is going on
  -h, --help            Show this help message and exit

The port is optional here. The script will use 443 if not specified.

-f, --host-file File containing hostnames for input

-H, --host Enter the hosts separated by space

-s, --socks Enable connection through the SOCKS server

-c, --csv Enable CSV file export by specifying filename.csv after this argument

-j, --json Use this if you want only to have the result in JSON

-S, --summary This argument will show a quick summary of the output

-x, --html Enable HTML file export

-J, --json-save Use this if you want to save as JSON file per host

-a, --analyze This argument will include security analysis on the certificate. Takes more time. No result means failure to analyze.

-v, --verbose Shows more output. Good for troubleshooting.

-h, --help Shows the help and exit

Example

narbeh@narbeh-laptop:~/ssl-checker$ ./ssl_checker.py -H time.com github.com:443
+---------------------+
| Analyzing 2 host(s) |
+---------------------+
	[✓] time.com
	-------------
		Issued domain: time.com
		Issued to: None
		Issued by: Amazon (US)
		Valid from: 2019-09-06
		Valid to: 2020-10-06 (78 days left)
		Validity days: 396
		Certificate valid: True
		Certificate S/N: 20641318859548253362475798736742284477
		Certificate SHA1 FP: D5:CE:1B:77:AB:59:C9:BE:37:58:0F:5D:73:97:64:98:C4:3E:43:30
		Certificate version: 2
		Certificate algorithm: sha256WithRSAEncryption
		Expired: False
		Certificate SANs: 
		 \_ DNS:time.com
		 \_ DNS:*.time.com


	[✓] github.com
	---------------
		Issued domain: github.com
		Issued to: GitHub, Inc.
		Issued by: DigiCert Inc (US)
		Valid from: 2020-05-05
		Valid to: 2022-05-10 (659 days left)
		Validity days: 735
		Certificate valid: True
		Certificate S/N: 7101927171473588541993819712332065657
		Certificate SHA1 FP: 5F:3F:7A:C2:56:9F:50:A4:66:76:47:C6:A1:8C:A0:07:AA:ED:BB:8E
		Certificate version: 2
		Certificate algorithm: sha256WithRSAEncryption
		Expired: False
		Certificate SANs: 
		 \_ DNS:github.com
		 \_ DNS:www.github.com


+-------------------------------------------------------------------------------------------+
| Successful: 2 | Failed: 0 | Valid: 2 | Warning: 0 | Expired: 0 | Duration: 0:00:07.694433 |
+-------------------------------------------------------------------------------------------+

NOTE: Keep in mind that if the certificate has less than 15 days of validity, the script will consider it as a warning in the summary.

Censored?

No problem. Pass -s/--socks argument to the script with HOST:PORT format to connect through the SOCKS proxy.

narbeh@narbeh-xps:~/ssl-checker$ ./ssl_checker.py -H facebook.com
+-------------------+
|Analyzing 1 host(s)|
+-------------------+

	[✗] facebook.com         Failed: [Errno 111] Connection refused

+-------------------------------------------------------------------------------------------+
| Successful: 0 | Failed: 1 | Valid: 0 | Warning: 0 | Expired: 0 | Duration: 0:00:04.109058 |
+-------------------------------------------------------------------------------------------+

narbeh@narbeh-xps:~/ssl-checker$ ./ssl_checker.py -H facebook.com -s localhost:9050
+---------------------+
| Analyzing 1 host(s) |
+---------------------+
	[✓] facebook.com
	-----------------
		Issued domain: *.facebook.com
		Issued to: Facebook, Inc.
		Issued by: DigiCert Inc (US)
		Valid from: 2020-05-14
		Valid to: 2020-08-05 (16 days left)
		Validity days: 83
		Certificate valid: True
		Certificate S/N: 19351530099991824979726880175805235719
		Certificate SHA1 FP: 89:7F:54:63:61:34:2F:7E:B4:B5:68:E2:92:79:D2:98:B4:97:D8:EA
		Certificate version: 2
		Certificate algorithm: sha256WithRSAEncryption
		Expired: False
		Certificate SANs: 
		 \_ DNS:*.facebook.com
		 \_ DNS:*.facebook.net
		 \_ DNS:*.fbcdn.net
		 \_ DNS:*.fbsbx.com
		 \_ DNS:*.messenger.com
		 \_ DNS:facebook.com
		 \_ DNS:messenger.com
		 \_ DNS:*.m.facebook.com
		 \_ DNS:*.xx.fbcdn.net
		 \_ DNS:*.xy.fbcdn.net
		 \_ DNS:*.xz.fbcdn.net


+-------------------------------------------------------------------------------------------+
| Successful: 1 | Failed: 0 | Valid: 1 | Warning: 0 | Expired: 0 | Duration: 0:00:00.416188 |
+-------------------------------------------------------------------------------------------+

Quick Summary

Sometimes you need to run the script and get a quick summary of the hosts. You will get a quick overview of the result by passing -S/--summary.

narbeh@narbeh-xps:~/ssl-checker$ ./ssl_checker.py -H narbeh.org:443 test.com twitter.com -S
+-------------------------------------------------------------------------------------------+
| Successful: 3 | Failed: 0 | Valid: 3 | Warning: 0 | Expired: 0 | Duration: 0:00:01.958670 |
+-------------------------------------------------------------------------------------------+

Security Analyze

By passing -a/--analyze to the script, it will scan the certificate for security issues and vulnerabilities. It will also mark a grade for the certificate. This will take more time to finish.

narbeh@narbeh-xps:~/ssl-checker$ ./ssl_checker.py -H narbeh.org:443 -a
+---------------------+
| Analyzing 1 host(s) |
+---------------------+

Warning: -a/--analyze is enabled. It takes more time...

	[✓] narbeh.org

		Issued domain: narbeh.org
		Issued to: None
		Issued by: Let's Encrypt (US)
		Valid from: 2018-04-21
		Valid to: 2018-07-20 (88 days left)
		Validity days: 90
		Certificate S/N: 338163108483756707389368573553026254634358
		Certificate version: 2
		Certificate algorithm: sha256WithRSAEncryption
		Certificate grade: A
		Poodle vulnerability: False
		Heartbleed vulnerability: False
		Heartbeat vulnerability: True
		Freak vulnerability: False
		Logjam vulnerability: False
		Drown vulnerability: False
		Expired: False

+------------------------------------------------------+
| Successful: 1 | Failed: 0 | Duration: 0:00:01.429145 |
+------------------------------------------------------+

JSON, HTML, and CSV Output

Example only with the -j/--json argument which shows the JSON only. Perfect for piping to another tool.

narbeh@narbeh-xps:~/ssl-checker$ ./ssl_checker.py -j -H narbeh.org:443
{"narbeh.org": {"host": "narbeh.org", "issued_to": "sni.cloudflaressl.com", "issued_o": "Cloudflare, Inc.", "issuer_c": "US", "issuer_o": "CloudFlare, Inc.", "issuer_ou": null, "issuer_cn": "CloudFlare Inc ECC CA-2", "cert_sn": "20958932659753030511717961095784314907", "cert_sha1": "FC:2D:0E:FD:DE:C0:98:7D:23:D2:E7:14:4C:07:6A:3D:25:25:49:B6", "cert_alg": "ecdsa-with-SHA256", "cert_ver": 2, "cert_sans": "DNS:sni.cloudflaressl.com; DNS:narbeh.org; DNS:*.narbeh.org", "cert_exp": false, "cert_valid": true, "valid_from": "2020-04-02", "valid_till": "2020-10-09", "validity_days": 190, "days_left": 81, "valid_days_to_expire": 81, "tcp_port": 443}}

CSV export is also easy. After running the script with -c/--csv argument and specifying filename.csv after it, you'll have something like this:

narbeh@narbeh-xps:~/ssl-checker$ cat domain.csv 
narbeh.org
issued_to,narbeh.org
valid_till,2018-07-20
valid_from,2018-04-21
issuer_ou,None
cert_ver,2
cert_alg,sha256WithRSAEncryption
cert_exp,False
issuer_c,US
issuer_cn,Let's Encrypt Authority X3
issuer_o,Let's Encrypt
validity_days,90
cert_sn,338163108483756707389368573553026254634358

Finally, if you want to export JSON's output per host in a separate file, use -J/--json-save. This will export JSON's output per host.

As a Python Module

Import the ssl_checker.py into your Python script and use it as a module.

from ssl_checker import SSLChecker

SSLChecker = SSLChecker()
args = {
    'hosts': ['google.com', 'cisco.com']
}

SSLChecker.show_result(SSLChecker.get_args(json_args=args))

Docker

From the Docker Hub

$ docker run -it --rm narbehaj/ssl-checker -H twitter.com

Build your own Dockerfile

If you want to run this script via docker, create your image and run it once:

$ docker build -t ssl-checker .
$ docker run -it --rm ssl-checker -H twitter.com

Todo

• Make print_status cleaner and smarter
• Add certificate chain validation