update ssh script

update-ssh.sh

#!/bin/bash

# Exit on error
set -e

# Variables
OPENSSH_VERSION="9.8p1"
WORKDIR="/usr/local/src"
PREFIX="/usr/local/openssh"

# Update and install dependencies
echo "Updating system and installing dependencies..."
sudo apt update && sudo apt upgrade -y
sudo apt install -y build-essential zlib1g-dev libssl-dev libpam0g-dev wget curl

# Create working directory
if [ ! -d "$WORKDIR" ]; then
    echo "Creating working directory: $WORKDIR"
    sudo mkdir -p "$WORKDIR"
fi
cd "$WORKDIR"

# Download OpenSSH source code
echo "Downloading OpenSSH $OPENSSH_VERSION..."
wget -q "https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-$OPENSSH_VERSION.tar.gz"

echo "Extracting OpenSSH $OPENSSH_VERSION..."
tar -xf "openssh-$OPENSSH_VERSION.tar.gz"
cd "openssh-$OPENSSH_VERSION"

# Configure and compile OpenSSH
echo "Configuring OpenSSH..."
./configure --prefix="$PREFIX" --sysconfdir="/etc/ssh" --with-pam --with-zlib --with-ssl-engine

echo "Compiling OpenSSH..."
make -j$(nproc)

# Install OpenSSH
echo "Installing OpenSSH..."
sudo make install

# Backup existing SSH configuration and binaries
echo "Backing up existing SSH configuration and binaries..."
if [ -f /usr/sbin/sshd ]; then
    sudo mv /usr/sbin/sshd /usr/sbin/sshd.bak
fi
if [ -f /usr/bin/ssh ]; then
    sudo mv /usr/bin/ssh /usr/bin/ssh.bak
fi

# Replace existing binaries with the new version
echo "Replacing existing SSH binaries with the new version..."
sudo ln -sf "$PREFIX/sbin/sshd" /usr/sbin/sshd
sudo ln -sf "$PREFIX/bin/ssh" /usr/bin/ssh
sudo ln -sf "$PREFIX/bin/scp" /usr/bin/scp
sudo ln -sf "$PREFIX/bin/sftp" /usr/bin/sftp
sudo ln -sf "$PREFIX/bin/ssh-keygen" /usr/bin/ssh-keygen
sudo ln -sf "$PREFIX/bin/ssh-keyscan" /usr/bin/ssh-keyscan
sudo ln -sf "$PREFIX/bin/ssh-add" /usr/bin/ssh-add
sudo ln -sf "$PREFIX/bin/ssh-agent" /usr/bin/ssh-agent

# Restart SSH service
echo "Restarting SSH service..."
sudo systemctl restart sshd

# Verify installation
echo "Verifying OpenSSH installation..."
/usr/sbin/sshd -V
/usr/bin/ssh -V

echo "OpenSSH $OPENSSH_VERSION installation completed successfully!"