Unlock the Mystery: Why OpenSSL s_client Isn't Displaying Certificates with -showcert Deep Dive
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Introduction
OpenSSL is a robust, full-featured toolkit for the Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols. It is widely used for various cryptographic operations, including SSL/TLS connections, certificate management, and data encryption. One of the most common commands used in OpenSSL is s_client, which is used to test the connection to a remote server using SSL. However, there are instances where the s_client command fails to display certificates, even when the -showcerts option is used. This article delves into the reasons behind this issue and provides a comprehensive guide to troubleshooting and resolving it.
Understanding OpenSSL s_client
Before we dive into the issue, let's briefly understand what the s_client command does. The s_client command is part of the OpenSSL suite and is used to connect to a remote server using SSL. It can be used to test the SSL connection, retrieve server certificates, and perform other SSL-related tasks.
The command syntax for s_client is as follows:
openssl s_client [-showcerts] [-connect host:port] [-servername hostname] [-cert cert.pem] [-key key.pem] [-CAfile cafile.pem] [-CADIR cadir] [-CSPrompt] [-no_ssl2] [-no_ssl3] [-ssl2] [-ssl3] [-tls1] [-tls1_1] [-tls1_2] [-tls1_3] [-ciphers cipherlist] [-engine id] [-ssl] [-ssl2] [-ssl3] [-tls1] [-tls1_1] [-tls1_2] [-tls1_3] [-kssl] [-kssl2] [-kssl3] [-ktls] [-ktls1] [-ktls1_1] [-ktls1_2] [-ktls1_3] [-cipher cipher] [-md md] [-md5] [-md4] [-md2] [-mdc2] [-rc4] [-rc4_40] [-rc4_56] [-rc2] [-des] [-des40] [-des-cbc] [-des-cfb] [-des-ecb] [-des-ede] [-des-ede-cbc] [-des-ede-cfb] [-des-ede-ofb] [-desx] [-idea] [-idea-cbc] [-idea-cfb] [-idea-ecb] [-idea-ofb] [-des-ede3] [-des-ede3-cbc] [-des-ede3-cfb] [-des-ede3-ofb] [-desx] [-aes-128-cbc] [-aes-128-cfb] [-aes-128-ecb] [-aes-192-cbc] [-aes-192-cfb] [-aes-192-ecb] [-aes-256-cbc] [-aes-256-cfb] [-aes-256-ecb] [-camellia-128-cbc] [-camellia-128-cfb] [-camellia-128-ecb] [-camellia-192-cbc] [-camellia-192-cfb] [-camellia-192-ecb] [-camellia-256-cbc] [-camellia-256-cfb] [-camellia-256-ecb] [-seal] [-seal-cbc] [-seal-cfb] [-seal-ofb] [-seal-ecb] [-seal-ede] [-seal-ede-cbc] [-seal-ede-cfb] [-seal-ede-ofb] [-seal-ede3] [-seal-ede3-cbc] [-seal-ede3-cfb] [-seal-ede3-ofb] [-seal-des] [-seal-des-cbc] [-seal-des-cfb] [-seal-des-ecb] [-seal-des-ede] [-seal-des-ede-cbc] [-seal-des-ede-cfb] [-seal-des-ede-ofb] [-seal-des-ede3] [-seal-des-ede3-cbc] [-seal-des-ede3-cfb] [-seal-des-ede3-ofb] [-seal-desx] [-seal-idea] [-seal-idea-cbc] [-seal-idea-cfb] [-seal-idea-ecb] [-seal-idea-ofb] [-seal-aes-128-cbc] [-seal-aes-128-cfb] [-seal-aes-128-ecb] [-seal-aes-192-cbc] [-seal-aes-192-cfb] [-seal-aes-192-ecb] [-seal-aes-256-cbc] [-seal-aes-256-cfb] [-seal-aes-256-ecb] [-seal-camellia-128-cbc] [-seal-camellia-128-cfb] [-seal-camellia-128-ecb] [-seal-camellia-192-cbc] [-seal-camellia-192-cfb] [-seal-camellia-192-ecb] [-seal-camellia-256-cbc] [-seal-camellia-256-cfb] [-seal-camellia-256-ecb] [-seal-rc4] [-seal-rc4-40] [-seal-rc4-56] [-seal-rc2] [-seal-des] [-seal-des-cbc] [-seal-des-cfb] [-seal-des-ecb] [-seal-des-ede] [-seal-des-ede-cbc] [-seal-des-ede-cfb] [-seal-des-ede-ofb] [-seal-des-ede3] [-seal-des-ede3-cbc] [-seal-des-ede3-cfb] [-seal-des-ede3-ofb] [-seal-desx] [-seal-idea] [-seal-idea-cbc] [-seal-idea-cfb] [-seal-idea-ecb] [-seal-idea-ofb] [-seal-aes-128-cbc] [-seal-aes-128-cfb] [-seal-aes-128-ecb] [-seal-aes-192-cbc] [-seal-aes-192-cfb] [-seal-aes-192-ecb] [-seal-aes-256-cbc] [-seal-aes-256-cfb] [-seal-aes-256-ecb] [-seal-camellia-128-cbc] [-seal-camellia-128-cfb] [-seal-camellia-128-ecb] [-seal-camellia-192-cbc] [-seal-camellia-192-cfb] [-seal-camellia-192-ecb] [-seal-camellia-256-cbc] [-seal-camellia-256-cfb] [-seal-camellia-256-ecb] [-seal-rc4] [-seal-rc4-40] [-seal-rc4-56] [-seal-rc2] [-seal-des] [-seal-des-cbc] [-seal-des-cfb] [-seal-des-ecb] [-seal-des-ede] [-seal-des-ede-cbc] [-seal-des-ede-cfb] [-seal-des-ede-ofb] [-seal-des-ede3] [-seal-des-ede3-cbc] [-seal-des-ede3-cfb] [-seal-des-ede3-ofb] [-seal-desx] [-seal-idea] [-seal-idea-cbc] [-seal-idea-cfb] [-seal-idea-ecb] [-seal-idea-ofb] [-seal-aes-128-cbc] [-seal-aes-128-cfb] [-seal-aes-128-ecb] [-seal-aes-192-cbc] [-seal-aes-192-cfb] [-seal-aes-192-ecb] [-seal-aes-256-cbc] [-seal-aes-256-cfb] [-seal-aes-256-ecb] [-seal-camellia-128-cbc] [-seal-camellia-128-cfb] [-seal-camellia-128-ecb] [-seal-camellia-192-cbc] [-seal-camellia-192-cfb] [-seal-camellia-192-ecb] [-seal-camellia-256-cbc] [-seal-camellia-256-cfb] [-seal-camellia-256-ecb] [-seal-rc4] [-seal-rc4-40] [-seal-rc4-56] [-seal-rc2] [-seal-des] [-seal-des-cbc] [-seal-des-cfb] [-seal-des-ecb] [-seal-des-ede] [-seal-des-ede-cbc] [-seal-des-ede-cfb] [-seal-des-ede-ofb] [-seal-des-ede3] [-seal-des-ede3-cbc] [-seal-des-ede3-cfb] [-seal-des-ede3-ofb] [-seal-desx] [-seal-idea] [-seal-idea-cbc] [-seal-idea-cfb] [-seal-idea-ecb] [-seal-idea-ofb] [-seal-aes-128-cbc] [-seal-aes-128-cfb] [-seal-aes-128-ecb] [-seal-aes-192-cbc] [-seal-aes-192-cfb] [-seal-aes-192-ecb] [-seal-aes-256-cbc] [-seal-aes-256-cfb] [-seal-aes-256-ecb] [-seal-camellia-128-cbc] [-seal-camellia-128-cfb] [-seal-camellia-128-ecb] [-seal-camellia-192-cbc] [-seal-camellia-192-cfb] [-seal-camellia-192-ecb] [-seal-camellia-256-cbc] [-seal-camellia-256-cfb] [-seal-camellia-256-ecb] [-seal-rc4] [-seal-rc4-40] [-seal-rc4-56] [-seal-rc2] [-seal-des] [-seal-des-cbc] [-seal-des-cfb] [-seal-des-ecb] [-seal-des-ede] [-seal-des-ede-cbc] [-seal-des-ede-cfb] [-seal-des-ede-ofb] [-seal-des-ede3] [-seal-des-ede3-cbc] [-seal-des-ede3-cfb] [-seal-des-ede3-ofb] [-seal-desx] [-seal-idea] [-seal-idea-cbc] [-seal-idea-cfb] [-seal-idea-ecb] [-seal-idea-ofb] [-seal-aes-128-cbc] [-seal-aes-128-cfb] [-seal-aes-128-ecb] [-seal-aes-192-cbc] [-seal-aes-192-cfb] [-seal-aes-192-ecb] [-seal-aes-256-cbc] [-seal-aes-256-cfb] [-seal-aes-256-ecb] [-seal-camellia-128-cbc] [-seal-camellia-128-cfb] [-seal-camellia-128-ecb] [-seal-camellia-192-cbc] [-seal-camellia-192-cfb] [-seal-camellia-192-ecb] [-seal-camellia-256-cbc] [-seal-camellia-256-cfb] [-seal-camellia-256-ecb] [-seal-rc4] [-seal-rc4-40] [-seal-rc4-56] [-seal-rc2] [-seal-des] [-seal-des-cbc] [-seal-des-cfb] [-seal-des-ecb] [-seal-des-ede] [-seal-des-ede-cbc] [-seal-des-ede-cfb] [-seal-des-ede-ofb] [-seal-des-ede3] [-seal-des-ede3-cbc] [-seal-des-ede3-cfb] [-seal-des-ede3-ofb] [-seal-desx] [-seal-idea] [-seal-idea-cbc] [-seal-idea-cfb] [-seal-idea-ecb] [-seal-idea-ofb] [-seal-aes-128-cbc] [-seal-aes-128-cfb] [-seal-aes-128-ecb] [-seal-aes-192-cbc] [-seal-aes-192-cfb] [-seal-aes-192-ecb] [-seal-aes-256-cbc] [-seal-aes-256-cfb] [-seal-aes-256-ecb] [-seal-camellia-128-cbc] [-seal-camellia-128-cfb] [-seal-camellia-128-ecb] [-seal-camellia-192-cbc] [-seal-camellia-192-cfb] [-seal-camellia-192-ecb] [-seal-camellia-256-cbc] [-seal-camellia-256-cfb] [-seal-camellia-256-ecb] [-seal-rc4] [-seal-rc4-40] [-seal-rc4-56] [-seal-rc2] [-seal-des] [-seal-des-cbc] [-seal-des-cfb] [-seal-des-ecb] [-seal-des-ede] [-seal-des-ede-cbc] [-seal-des-ede-cfb] [-seal-des-ede-ofb] [-seal-des-ede3] [-seal-des-ede3-cbc] [-seal-des-ede3-cfb] [-seal-des-ede3-ofb] [-seal-desx] [-seal-idea] [-seal-idea-cbc] [-seal-idea-cfb] [-seal-idea-ecb] [-seal-idea-ofb] [-seal-aes-128-cbc] [-seal-aes-128-cfb] [-seal-aes-128-ecb] [-seal-aes-192-cbc] [-seal-aes-192-cfb] [-seal-aes-192-ecb] [-seal-aes-256-cbc] [-seal-aes-256-cfb] [-seal-aes-256-ecb] [-seal-camellia-128-cbc] [-seal-camellia-128-cfb] [-seal-camellia-128-ecb] [-seal-camellia-192-cbc] [-seal-camellia-192-cfb] [-seal-camellia-192-ecb] [-seal-camellia-256-cbc] [-seal-camellia-256-cfb] [-seal-camellia-256-ecb] [-seal-rc4] [-seal-rc4-40] [-seal-rc4-56] [-seal-rc2] [-seal-des] [-seal-des-cbc] [-seal-des-cfb] [-seal-des-ecb] [-seal-des-ede] [-seal-des-ede-cbc] [-seal-des-ede-cfb] [-seal-des-ede-ofb] [-seal-des-ede3] [-seal-des-ede3-cbc] [-seal-des-ede3-cfb] [-seal-des-ede3-ofb] [-seal-desx] [-seal-idea] [-seal-idea-cbc] [-seal-idea-cfb] [-seal-idea-ecb] [-seal-idea-ofb] [-seal-aes-128-cbc] [-seal-aes-128-cfb] [-seal-aes-128-ecb] [-seal-aes-192-cbc] [-seal-aes-192-cfb] [-seal-aes-192-ecb] [-seal-aes-256-cbc] [-seal-aes-256-cfb] [-seal-aes-256-ecb] [-seal-camellia-128-cbc] [-seal-camellia-128-cfb] [-seal-camellia-128-ecb] [-seal-camellia-192-cbc] [-seal-camellia-192-cfb] [-seal-camellia-192-ecb] [-seal-camellia-256-cbc] [-seal-camellia-256-cfb] [-seal-camellia-256-ecb] [-seal-rc4] [-seal-rc4-40] [-seal-rc4-56] [-seal-rc2] [-seal-des] [-seal-des-cbc] [-seal-des-cfb] [-seal-des-ecb] [-seal-des-ede] [-seal-des-ede-cbc] [-seal-des-ede-cfb] [-seal-des-ede-ofb] [-seal-des-ede3] [-seal-des-ede3-cbc] [-seal-des-ede3-cfb] [-seal-des-ede3-ofb] [-seal-desx] [-seal-idea] [-seal-idea-cbc] [-seal-idea-cfb] [-seal-idea-ecb] [-seal-idea-ofb] [-seal-aes-128-cbc] [-seal-aes-128-cfb] [-seal-aes-128-ecb] [-seal-aes-192-cbc] [-seal-aes-192-cfb] [-seal-aes-192-ecb] [-seal-aes-256-cbc] [-seal-aes-256-cfb] [-seal-aes-256-ecb] [-seal-camell
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