The toolkit is loaded with tons of functionalities that can be performed using various options. OpenSSL is an open source toolkit used to implement the Secure Socket Layer (SSL) and Transport Layer Security (TLS) protocols. Increase virtual disk size of Windows10 VM on QEMU-KVM.
#Openssl command how to#
How to generate MD5 or SHA1 hash for a file? How to view your Certificate DN, validity, hash? How to verify or display POP server certificate information? How to test remote web server's certificate? How to generate Self Signed Keys using Openssl? How to generate Certificate Signing Request (CSR)? How to list the supported ciphers in openssl? Info: Run man x509 to see the all available options. Prints out the digest of the DER encoded version of the whole certificate. Prints out the start and expiry dates of a certificate. Prevents output of the encoded version of the request. MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQDĮxpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xNzAzMTgxMDU1MDBaFw0x MIIFGDCCBACgAwIBAgISA4b0Yz00UKhHzPeZEB95HCHIMA0GCSqGSIb3DQEBCwUA Show the SSL certificate itself (encoded): $ echo | openssl s_client -servername -connect :443 2>/dev/null | openssl x509 Signature Algorithm: sha256WithRSAEncryption Show the SHA1 fingerprint of the SSL certificate: $ echo | openssl s_client -servername -connect 2>/dev/null | openssl x509 -noout -fingerprint Subject= /CN=notBefore=Mar 18 10:55:00 2017 GMTĬool Tip: You can also decode an SSL certificate file if you have it locally, using the openssl utility from the Linux command-line! Read more →
Show the all above information about the SSL certificate, at once: $ echo | openssl s_client -servername -connect :443 2>/dev/null | openssl x509 -noout -issuer -subject -dates Subject= /CN=Check for what dates the SSL certificate is valid: $ echo | openssl s_client -servername -connect :443 2>/dev/null | openssl x509 -noout -dates Issuer= /C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X3Ĭheck whom the SSL certificate is issued to: $ echo | openssl s_client -servername -connect :443 2>/dev/null | openssl x509 -noout -subject
OpenSSL: Check SSL Certificate – Additional Informationīesides of the validity dates, an SSL certificate contains other interesting information.Įach SSL certificate contains the information about who has issued the certificate, whom is it issued to, already mentioned validity dates, SSL certificate’s SHA1 fingerprint and some other data.Īll these data can retrieved from a website’s SSL certificate using the openssl utility from the command-line in Linux.Ĭheck who has issued the SSL certificate: $ echo | openssl s_client -servername -connect :443 2>/dev/null | openssl x509 -noout -issuer Info: Run man s_client to see the all available options.Īs an example, let’s use the openssl to check the SSL certificate expiration date of the website: $ echo | openssl s_client -servername -connect 2>/dev/null | openssl x509 -noout -dates The TLS SNI (Server Name Indication) extension (website). Run the following one-liner from the Linux command-line to check the SSL certificate expiration date, using the openssl: $ echo | openssl s_client -servername NAME -connect HOST: PORT 2>/dev/null | openssl x509 -noout -dates Linux users can easily check an SSL certificate from the Linux command-line, using the openssl utility, that can connect to a remote website over HTTPS, decode an SSL certificate and retrieve the all required data.Ĭool Tip: If your SSL certificate expires soon – you will need to generate a new CSR! In Linux this can be easily done with a simple one-liner! Read more → Check SSL Certificate Expiration Date From this article you will learn how to connect to a website over HTTPS and check its SSL certificate expiration date from the Linux command-line.īesides of validity dates, i’ll show how to view who has issued an SSL certificate, whom is it issued to, its SHA1 fingerprint and the other useful information.
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