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Upgrade openssh-server on Ubuntu

发表于 更新于 Disqus：
Upgrade openssh-server on Ubuntu 16.04

Backup

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cp /etc/init.d/ssh /etc/init.d/ssh.old && cp -r /etc/ssh /etc/ssh.old

Download

Go to https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/portable/, download the latest version package.

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wget https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-8.2p1.tar.gz
tar zxf openssh-8.2p1.tar.gz

Installation

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sudo apt install libssl-dev
sudo apt install libpam-dev
sudo apt install libz-dev
./configure --prefix=/usr --sysconfdir=/etc/ssh --with-md5-passwords --with-pam --with-privsep-path=/var/lib/sshd
make -j8
sudo make install

sudo chown 600 /etc/ssh/*key
chmod 600 ~/.ssh/authorized_keys

Problem

Job for ssh.service failed because a timeout was exceeded

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apt-get install libsystemd-dev

add code in sshd.c before calling server_accept_loop

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#include <systemd/sd-daemon.h>
...
    /* Signal systemd that we are ready to accept connections */
    sd_notify(0, "READY=1");

    /* Accept a connection and return in a forked child */
    server_accept_loop(&sock_in, &sock_out,
                    &newsock, config_s);
...

Makefile

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LIBS=-lcrypto -ldl -lutil -lz  -lcrypt -lresolv -lsystemd

Reference