General OpenSSL Commands These commands allow you to generate CSRs, Certificates, Private Keys and do other miscellaneous tasks. Generate a new private key and Certificate Signing Request openssl req -out CSR.csr -new -newkey rsa:2048 -nodes -keyout privateKey.key. One of the most versatile SSL tools is OpenSSL which is an open source implementation of the SSL protocol. There are versions of OpenSSL for nearly every platform, including Windows, Linux, and Mac OS X. OpenSSL is commonly used to create the CSR and private key for many different platforms, including Apache.

OpenSSL is a widely-used tool for working with CSR files and SSL certificates and is available for download on the official OpenSSL website. It is an open-source implementation tool for SSL/TLS and is used on about 65% of all active internet servers, making it the unofficial industry standard. OpenSSL.crypto.loadcertificaterequest(type, buffer) ¶ Load a certificate request (X509Req) from the string buffer encoded with the type type. It can be useful to check a certificate and key before applying them to your server. The following commands help verify the certificate, key, and CSR (Certificate Signing Request). Check a certificate. Check a certificate and return information about it (signing authority, expiration date, etc.): openssl x509 -in server.crt -text -noout Check a key.

Someday you may need to get the SSL certificate of a website and save it locally.

For example, you could get an error saying that you can’t clone a Git repository due to a self-signed certificate and to resolve this issue you would need to download the SSL certificate and make it trusted by your Git client.

In the following article i am showing how to export the SSL certificate from a server (site URL) using Google Chrome, Mozilla Firefox and Internet Explorer browsers as well as how to get SSL certificate from the command line, using openssl command.

Cool Tip: Create a self-signed SSL Certificate! Read more →

Export SSL Certificate

Google Chrome

Export the SSL certificate of a website using Google Chrome:

  1. Click the Secure button (a padlock) in an address bar
  2. Click the Show certificate button
  3. Go to the Details tab
  4. Click the Export button
  5. Specify the name of the file you want to save the SSL certificate to, keep the “Base64-encoded ASCII, single certificate” format and click the Save button

Mozilla Firefox

Export the SSL certificate of a website using Mozilla Firefox:

  1. Click the Site Identity button (a padlock) in an address bar
  2. Click the Show connection details arrow
  3. Click the More Information button
  4. Click the View Certificate button
  5. Go to the Details tab
  6. Click the Export button
  7. Specify the name of the file you want to save the SSL certificate to, keep the “X.509 Certificate (PEM)” format and click the Save button
Openssl load certificate python

Cool Tip: Check the expiration date of the SSL Certificate from the Linux command line! The fastest way! Read more →

Internet Explorer

Download and save the SSL certificate of a website using Internet Explorer:

  1. Click the Security report button (a padlock) in an address bar
  2. Click the View Certificate button
  3. Go to the Details tab
  4. Click the Copy to File... button
  5. Click the Next button
  6. Select the “Base-64 encoded X.509 (.CER)” format and click the Next button
  7. Specify the name of the file you want to save the SSL certificate to
  8. Click the Next and the Finish buttons

OpenSSL

Get the SSL certificate of a website using openssl command:

Short explanation:

OptionDescription
-connect HOST:PORTThe host and port to connect to
-servername NAMEThe TLS SNI (Server Name Indication) extension (website)
certificate.crtSave SSL certificate to this file
Openssl load_cert_chain

Example:

Server security requires a CA-signed certificate and the TLS protocol
Reliable security of any production web server requires an SSL certificate signed by a trusted certificate authority (CA) and enforced use of the TLS protocol (that is, HTTPS, not HTTP).

CertificateUnable to load certificates openssl pkcs12

Generate Openssl Certificate

Openssl Load Certificate

Your on-premises Code42 authority server is no exception. A Code42 server that is configured to use a signed certificate, strict TLS validation, and strict security headers protects server communications with browsers, your Code42 apps, and other servers.

Openssl Ssl Certificate

  • By default, your authority server uses a self-signed certificate and TLS. That provides for encrypting client-server traffic.
  • Adding a CA-signed certificate provides further security by confirming your server's identity to clients. It prevents attackers from acquiring client data through counterfeit servers and encryption keys.
  • Never reconfigure a production server to use HTTP, rather than TLS and HTTPS.
  • Configuring Code42 servers and apps to use strict TLS validation further ensures the security of client-server connections.
  • Configuring Code42 servers to use an HTTPS Strict Transport Security (HSTS) response header further prevents unencrypted browser access to Code42 consoles.
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