{"id":2243,"date":"2024-11-30T12:30:00","date_gmt":"2024-11-30T18:30:00","guid":{"rendered":"https:\/\/www.linuxcloudvps.com\/blog\/?p=2243"},"modified":"2024-11-11T08:45:28","modified_gmt":"2024-11-11T14:45:28","slug":"testing-an-ssl-connection-using-openssl","status":"publish","type":"post","link":"https:\/\/www.linuxcloudvps.com\/blog\/testing-an-ssl-connection-using-openssl\/","title":{"rendered":"Guide to Testing an SSL Connection Using OpenSSL"},"content":{"rendered":"\n

In this tutorial, we will provide helpful information about SSL certificates, SSL connections and testing an SSL connection using OpenSSL. The SSL certificates are necessary for domain names since they display essential information for verifying the website’s owner. It also encrypts the web traffic with SSL\/TLS, including the public key, the certificate authority, and the associated subdomains. The traffic is through HTTPS (Hypertext Transfer Protocol Secure) when there is a valid SSL certificate, and this technology encrypts the data sent between a website and a browser. It prevents hackers from seeing or stealing any information, like personal data.<\/p>\n\n\n\n

In the following paragraphs, we will proceed with the OpenSSL as software, how to install it, and how to test the SSL connections. Let’s get started!<\/p>\n\n\n\n\n\n\n\n

What is OpenSSL?<\/h2>\n\n\n\n

OpenSSL is an open-source software library for applications that provides secure communications and implements the SSL and TLS protocols. It is written in C and implements basic cryptographic and utility functions. It is available for most Unix-like operating systems, such as Linux, MacOS, BSD, and Microsoft Windows. OpenSSL is used to generate certificate signing requests or private keys and to install and convert SSL certificates.<\/p>\n\n\n\n

In the next paragraph, we will show you how to install OpenSSL and check its version.<\/p>\n\n\n\n

How to install OpenSSL?<\/h2>\n\n\n\n

Since we are a Linux server<\/a> company that offers support for Linux servers<\/a>, this blog post will use a server with a Linux OS. We chose the latest Ubuntu 24.04. Let’s get things done!<\/p>\n\n\n\n

First, update the system packages to the latest versions available before installing them.<\/p>\n\n\n\n

sudo apt update -y && sudo apt upgrade -y<\/pre>\n\n\n\n
Once the system is updated, we can proceed with the installation of the OpenSSL with the command below:<\/p>\n\n\n\n
sudo apt install openssl -y<\/pre>\n\n\n\n
After successful installation, you can check the OpenSSL version with the following command:<\/p>\n\n\n\n
openssl version<\/pre>\n\n\n\n
You should get output similar to this:<\/p>\n\n\n\n
root@host:~#  openssl version\nOpenSSL 3.0.13 30 Jan 2024 (Library: OpenSSL 3.0.13 30 Jan 2024)\n<\/pre>\n\n\n\n
Testing an SSL Connection Using OpenSSL<\/h2>\n\n\n\n
Now, when almost everything is explained, and OpenSSL is installed, we can test a connection using it. Testing a connection using OpenSSL is with a simple command, and the syntax is the following one:<\/p>\n\n\n\n
openssl s_client -connect DomainNameHere:HTTPS-Port<\/strong><\/pre>\n\n\n\n
The s_client<\/strong> option analyzes client-to-server communication. It checks for a connection, an open port, the type of SSL, and its expiration.<\/p>\n\n\n\n
So, to test the connection to some domain, let’s say google.com on port 443 (HTTPS port), we need to execute the following command:<\/p>\n\n\n\n
openssl s_client -connect google.com:443<\/pre>\n\n\n\n
Executing this command will give us the following output:<\/p>\n\n\n\n
oot@host:~# openssl s_client -connect google.com:443\nCONNECTED(00000003)\ndepth=2 C = US, O = Google Trust Services LLC, CN = GTS Root R1\nverify return:1\ndepth=1 C = US, O = Google Trust Services, CN = WR2\nverify return:1\ndepth=0 CN = *.google.com\nverify return:1\n---\nCertificate chain\n 0 s:CN = *.google.com\n   i:C = US, O = Google Trust Services, CN = WR2\n   a:PKEY: id-ecPublicKey, 256 (bit); sigalg: RSA-SHA256\n   v:NotBefore: Sep 16 08:55:48 2024 GMT; NotAfter: Dec  9 08:55:47 2024 GMT\n 1 s:C = US, O = Google Trust Services, CN = WR2\n   i:C = US, O = Google Trust Services LLC, CN = GTS Root R1\n   a:PKEY: rsaEncryption, 2048 (bit); sigalg: RSA-SHA256\n   v:NotBefore: Dec 13 09:00:00 2023 GMT; NotAfter: Feb 20 14:00:00 2029 GMT\n 2 s:C = US, O = Google Trust Services LLC, CN = GTS Root R1\n   i:C = BE, O = GlobalSign nv-sa, OU = Root CA, CN = GlobalSign Root CA\n   a:PKEY: rsaEncryption, 4096 (bit); sigalg: RSA-SHA256\n   v:NotBefore: Jun 19 00:00:42 2020 GMT; NotAfter: Jan 28 00:00:42 2028 GMT\n---\nServer certificate\n----BEGIN CERTIFICATE-----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\n                            .\n                            .\n                            .\n                            .\n                            .\n0s2cWl0xFcxs0a0SW6qrZ5B5HZfHWhpReutvFTBNrrmsbfV5QVVhUj2YgYUKuzvP\n4sBPAlHwMiev16xhuuPryzB19JC8qX5NkVWvh51Ems8l5xWgUehM8zaQSYFfTMwQ\neq8v++gDRJLhccoymVm1GVAj6JpgJBukWLLH5wCpkevRb1vSBsnB2uXgc02R7OWR\nVjF+xfXe\/V2bZ1uiHLqboeBqY4AwekA6Zbvo3SxBodOZffA01wQuXeg9SX+rocF8\ntOeQEOuP9LAlbijGOVt7Nlf58RWF\/FGxUPbf9\/ZIZwDBXDpCsV6GxAQEt4mFkQ4=\n-----END CERTIFICATE-----\nsubject=CN = *.google.com\nissuer=C = US, O = Google Trust Services, CN = WR2\n---\nNo client certificate CA names sent\nPeer signing digest: SHA256\nPeer signature type: ECDSA\nServer Temp Key: X25519, 253 bits\n---\nSSL handshake has read 6592 bytes and written 392 bytes\nVerification: OK\n---\nNew, TLSv1.3, Cipher is TLS_AES_256_GCM_SHA384\nServer public key is 256 bit\nSecure Renegotiation IS NOT supported\nCompression: NONE\nExpansion: NONE\nNo ALPN negotiated\nEarly data was not sent\nVerify return code: 0 (ok)<\/strong>\n<\/pre>\n\n\n\n
As you can see, the last line is for the verification return code. It says that is ok<\/strong>. That means that testing the connection using OpenSSL was successful.<\/p>\n\n\n\n
This command provided us with Google.com’s certificate, details about the organization and the issuer, when it was issued, expired, the TLS version, etc.<\/p>\n\n\n\n
If you want to get shorter output from the command, you can use the following one:<\/p>\n\n\n\n
openssl s_client -connect google.com:443 -brief<\/pre>\n\n\n\n
You should get the following output:<\/p>\n\n\n\n
root@host:~# openssl s_client -connect google.com:443 -brief\nCONNECTION ESTABLISHED\nProtocol version: TLSv1.3\nCiphersuite: TLS_AES_256_GCM_SHA384\nPeer certificate: CN = *.google.com\nHash used: SHA256\nSignature type: ECDSA\nVerification: OK\nServer Temp Key: X25519, 253 bits\n<\/pre>\n\n\n\n
This command does not provide much information, but you can check if the Connection is Established.<\/p>\n\n\n\n
That’s it. You successfully tested an SSL Connection using OpenSSL on Ubuntu 24.04 OS.<\/p>\n\n\n\n
If you liked this Guide about testing an SSL Connection using OpenSSL, please share it with your friends or leave a comment below.<\/p>\n","protected":false},"excerpt":{"rendered":"
In this tutorial, we will provide helpful information about SSL certificates, SSL connections and testing an SSL connection using OpenSSL. The SSL certificates are necessary for domain names since they display essential information for verifying the website’s owner. It also encrypts the web traffic with SSL\/TLS, including the public key, the certificate authority, and the … Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":2261,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[206],"tags":[203,118,329,315,328,327],"class_list":["post-2243","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-how-to","tag-guide","tag-how-to","tag-open-ssl","tag-ssl","tag-ssl-connection","tag-testing"],"yoast_head":"\nTesting an SSL Connection Using OpenSSL | LinuxCloudVPS Blog<\/title>\n<meta name=\"description\" content=\"Learn all you need to about testing an SSL connection using OpenSSL with our latest easy-to-understand guide.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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