How to Compile OpenSSL to Support Weak Ciphers and 3DES

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If you used the third method to enable weak ciphers on Zimbra in the previous article, this is my approach to enable it.

For example, I am using Ubuntu for compile OpenSSL

– Install the package to compile

sudo apt-get update && sudo apt-get upgrade -y
sudo apt install build-essential make wget -y

– Get OpenSSL version that used by Zimbra

su - zimbra
openssl version

In the latest Zimbra patch, the OpenSSL version used is 3.0.9


– Download the same version of OpenSSL

cd /srv/
wget -c

– Extract and configure OpenSSL to Support Weak Ciphers and 3DES

tar -xvf openssl-3.0.9.tar.gz
cd openssl-3.0.9
./config enable-weak-ssl-ciphers enable-des shared --prefix=/opt/openssl-3.0.9 -Wl,-rpath=/opt/openssl-3.0.9/lib64 -DOPENSSL_TLS_SECURITY_LEVEL=0 

– Compile OpenSSL

sudo make
sudo make install

Please wait until the compilation process is complete

– Check the compiled openssl version

/opt/openssl-3.0.9/bin/openssl version

Below is the result

root@mail:~# /opt/openssl-3.0.9/bin/openssl version
OpenSSL 3.0.9 30 May 2023 (Library: OpenSSL 3.0.9 30 May 2023)

Good luck 🙂

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