{"id":4836,"date":"2018-06-13T22:21:15","date_gmt":"2018-06-13T18:21:15","guid":{"rendered":"https:\/\/www.howtoforge.com\/tutorial\/how-to-install-openssl-from-source-on-linux\/"},"modified":"2018-06-13T22:21:15","modified_gmt":"2018-06-13T18:21:15","slug":"how-to-install-the-latest-openssl-version-from-source-on-linux","status":"publish","type":"post","link":"https:\/\/afaghhosting.net\/blog\/how-to-install-the-latest-openssl-version-from-source-on-linux\/","title":{"rendered":"How to Install the latest OpenSSL version from Source on Linux"},"content":{"rendered":"

OpenSSL is a widely used crypto library that implements SSL and TLS protocols\u00a0to secure communications over computer networks. OpenSSL is widely used by many software like Apache web server, PHP, Postfix and many others. OpenSSL offers support for different cryptographic algorithms such as Chipers (AES, Blowfish, DES, IDEA etc), Cryptographic hash functions (MD5, MD4, SHA-1, SHA-2 etc), and Public-key cryptography (RSA, DSA, Diffie-Hellman key exchange).<\/p>\n

In this tutorial, I will show you step-by-step how to install the latest stable OpenSSL version from source on the Ubuntu 18.04 and CentOS 7.5 servers.<\/p>\n

What we will do?<\/h2>\n
    \n
  1. Install Dependencies<\/li>\n
  2. Download OpenSSL Source Code<\/li>\n
  3. Install OpenSSL<\/li>\n
      \n
    1. Compile and Install OpenSSL<\/li>\n
    2. Configure Link Libraries<\/li>\n
    3. Configure OpenSSL Binary<\/li>\n<\/ol>\n
    4. Testing<\/li>\n<\/ol>\n

      Step 1 – Install Dependencies<\/h2>\n

      The first step we must do for compiling the OpenSSL manually from source is installing some package dependencies including the ‘build-essential’ package on Ubuntu, or ‘Development Tools’ package on CentOS.<\/p>\n

      On Ubuntu 18.04<\/h3>\n

      Update the Ubuntu repository and install package dependencies for software compilation using the apt command below.<\/p>\n

      sudo apt update
      sudo apt install build-essential checkinstall zlib1g-dev -y<\/p>\n

      On CentOS 7.5<\/h3>\n

      Install the ‘Development Tools’ and some packages libraries using the yum command.<\/p>\n

      yum group install ‘Development Tools’
      yum install perl-core zlib-devel -y<\/p>\n

      After the installation is complete, go to the next step.<\/p>\n

      Step 2 – Download OpenSSL<\/h2>\n

      In this tutorial, we will install the latest stable version of OpenSSL – OpenSSL 1.0.2o. You can download the source code from the OpenSSL site<\/a>.<\/p>\n

      Go to the ‘\/usr\/local\/src’ directory and download the OpenSSL source code using wget.<\/p>\n

      cd \/usr\/local\/src\/
      wget https:\/\/www.openssl.org\/source\/openssl-1.0.2o.tar.gz<\/p>\n

      Now extract the openssl.tar.gz file, and go to the ‘openssl’ directory.<\/p>\n

      tar -xf openssl-1.0.2o.tar.gz
      cd openssl-1.0.2o<\/p>\n

      \"Download<\/a><\/p>\n

      The OpenSSL source code has been downloaded.<\/p>\n

      Step 3 – Install OpenSSL<\/h2>\n

      Before installing the custom OpenSSL version to the system, let’s check the installed version using the command below.<\/p>\n

      openssl version -a<\/p>\n

      Below is my results on Ubuntu 18.04.<\/p>\n

      \"Compile<\/a><\/p>\n

      And this is on CentOS 7.5.<\/p>\n

      \"Compile<\/a><\/p>\n

      We will replace the ‘1.1.0g’ version with the latest stable version 1.0.2o.<\/p>\n

      We will install the new OpenSSL version to the specific directory ‘\/usr\/local\/ssl’, and then enable the Link Libraries of OpenSSL, and configure the new binary PATH for OpenSSL.<\/p>\n

      – Install and Compile OpenSSL<\/h3>\n

      Go to the openssl downloaded directory ‘\/usr\/local\/src\/openssl’.<\/p>\n

      cd \/usr\/local\/src\/openssl-1.0.2o<\/p>\n

      Configure and compile OpenSSL with commands below.<\/p>\n

      .\/config –prefix=\/usr\/local\/ssl –openssldir=\/usr\/local\/ssl shared zlib<\/p>\n

      make
      make test<\/p>\n

      Wait for the OpenSSL compile process.<\/p>\n

      Note:<\/strong><\/p>\n