Latest OpenSSH RPM / SRPM for old CentOS

• CentOS 5
• CentOS 6
• CentOS 7
• CentOS 8 (Stream 8)
• Amazon Linux 1
• Amazon Linux 2
• Amazon Linux 2023

Also tested on CentOS-like distros:

• UnionTech OS Server 20
• openEuler 22.03 (LTS-SP1)

Current Version:

• OpenSSH 9.6p1 (see: OpenSSH Official)
• OpenSSL 3.0.13 / 3.0.9 (FIPS validated, see: OpenSSL Official)

The build script reads version.env for actual version definitions.

Build Requirements:

yum groupinstall -y "Development Tools"
yum install -y imake rpm-build pam-devel krb5-devel zlib-devel libXt-devel libX11-devel gtk2-devel perl perl-IPC-Cmd

# For CentOS5 only:
yum install -y gcc44

Usage

Build RPMs

1. Install build requirements listed above.
2. Edit version.env file if necessary.
3. Download source packages.

./pullsrc.sh

if any error comes up, manally download the source files into the downloads dir. 4. Run the script to build RPMs.

./compile.sh

Install RPMs

# Go go the generated RPMS directory.
cd $(./compile.sh RPMDIR)
pwd
ls
# you will find multiple RPM files in this directory.
# you may copy them to other machines, and continue following steps there.

# Backup current SSH config
[[ -f /etc/ssh/sshd_config ]] && mv /etc/ssh/sshd_config /etc/ssh/sshd_config.$(date +%Y%m%d)

# Install rpm packages. Exclude all debug packages.
find . ! -name '*debug*' -name '*.rpm' | xargs sudo yum --disablerepo=* localinstall -y

# in case host key files got permissions too open.
chmod -v 600 /etc/ssh/ssh_host_*_key

# For CentOS7+:
# in some cases previously installed systemd unit file is left on disk after upgrade.
# causes systemd mixing unit files and initscripts units provided by this package.
if [[ -d /run/systemd/system && -f /usr/lib/systemd/system/sshd.service ]]; then
    mv /usr/lib/systemd/system/sshd.service /usr/lib/systemd/system/sshd.service.$(date +%Y%m%d)
    systemctl daemon-reload
fi

# Check Installed version:
ssh -V && /usr/sbin/sshd -V

# Restart service
service sshd restart

DO NOT DISCONNECET current ssh shell yet, open a NEW shell and login to you machine to verify that sshd is working properly.

Use Docker

See file docker.README.md

Security Notes

This package provide following options in /etc/ssh/sshd_config to work like triditional sshd.

PubkeyAcceptedAlgorithms +ssh-rsa
PermitRootLogin yes
PasswordAuthentication yes
UseDNS no
UsePAM yes
KexAlgorithms -diffie-hellman-group1-sha1,diffie-hellman-group1-sha256,diffie-hellman-group14-sha1,diffie-hellman-group14-sha256,diffie-hellman-group15-sha256,diffie-hellman-group15-sha512,diffie-hellman-group16-sha256,diffie-hellman-group16-sha512,diffie-hellman-group17-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha1,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha512