command line tool to check if a webserver has a valid https certificate.
checkssl checkssl.org
www.checkssl.org => 2600:9000:24d0:b800:1e:e294:3240:93a1
-> AmazonS3 -
-> HTTP/2 with TLS v1.3 (released 2018) - latest version
-> TLS_AES_128_GCM_SHA256 = TLS, message encrypted with AES128 GCM, hashes are SHA256
1) *.checkssl.org expires on 2025-06-28 11:59PM Sat (350.2 days)
CA-2) Amazon RSA 2048 M03 expires on 2030-08-23 10:26PM Fri (2232.1 days)
CA-3) Amazon Root CA 1 expires on 2037-12-31 1:00AM Thu (4918.2 days)
CA-4) Starfield Services Root Certificate Authority - G2 expires on 2034-06-28 5:39PM Wed (3636.9 days)
[PASS] https://checkssl.org
If the certificate is not valid, a non-zero exit code will be returned to stop a ci build.
checkssl expired.badssl.com
expired.badssl.com => 104.154.89.105
-> nginx/1.10.3 (Ubuntu) -
-> HTTP/1.1 (OLD) with TLS v1.2 (released 2008) - Consider upgrading to TLS v1.3
-> TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
1) *.badssl.com expired on 2015-04-12 11:59PM Sun (-3379.8 days)
CA-2) COMODO RSA Domain Validation Secure Server CA expires on 2029-02-11 11:59PM Sun (1674.2 days)
CA-3) COMODO RSA Certification Authority expired on 2020-05-30 10:48AM Sat (-1505.4 days)
https://expired.badssl.com x509: “*.badssl.com” certificate is expired
[FAIL] https://expired.badssl.com
checkssl ebay.com
=> 23.11.225.115
https://ebay.com stopped after 10 redirects
[FAIL] https://ebay.com
(You can use - or -- for all parameters)
-days=60 allows you to specify a threshold of when checkssl should error to allow CI jobs to fail if the certs are about to expire in a few days.
-json will switch the text output from human-readable to JSON format for easier parsing with other systems.
-csv will switch the text output to comma seperated values that are easier to copy and paste into a spreadsheet.
-no-color will not add terminal color syntax to output, helpful for CI systems that do not have color enabled.
-no-output will not show any text but still return a status code. Helpful for CI that just want to know if the certs are valid.
-short will reduce each target's output to just the pass/fail line with the url/dns.
0 All certificates passed
2 Certificate(s) are expired
3 Certificate(s) are valid now but user specified threshold failed (from -days flag)
4 Certificate(s) are not yet valid
5 General error, normally due to network failure
wget https://github.com/szazeski/checkssl/releases/download/v0.5.1/checkssl_$(uname -s)_$(uname -m).tar.gz -O checkssl.tar.gz && tar -xf checkssl.tar.gz && chmod +x checkssl && sudo mv checkssl /usr/local/bin/
Dockerhub docker run --rm szazeski/checkssl hub.docker.com
macports sudo port install checkssl
homebrew brew install szazeski/tap/checkssl
Invoke-WebRequest https://github.com/szazeski/checkssl/releases/download/v0.5.1/checkssl_Windows_x86_64.tar.gz -outfile checkssl.tar.gz; tar -xzf checkssl.tar.gz; echo "if you want, move the file to a PATH directory like WINDOWS folder"
then move to C:\Windows\ or other PATH directory