{"id":9873,"date":"2024-07-15T08:58:06","date_gmt":"2024-07-15T06:58:06","guid":{"rendered":"https:\/\/www.credativ.de\/blog\/credativ-inside\/run0-as-a-sudo-alternative\/"},"modified":"2024-07-15T08:58:06","modified_gmt":"2024-07-15T06:58:06","slug":"run0-as-a-sudo-alternative","status":"publish","type":"post","link":"https:\/\/www.credativ.de\/en\/blog\/howtos-en\/run0-as-a-sudo-alternative\/","title":{"rendered":"Run0 as a Sudo Alternative?"},"content":{"rendered":"

With version 256, systemd introduced run0<\/code>. Lennart Poettering describes run0<\/code> as an alternative to sudo and explains on Mastodon<\/a> at the same time what he sees as the problem with sudo. <\/p>\n

In this blog post, however, we do not want to go into the strengths or weaknesses of sudo, but take a closer look at run0<\/code> and use it as a sudo alternative.<\/p>\n

Unlike sudo, run0<\/code> uses neither the configuration file \/etc\/sudoers<\/code> nor a SUID bit to extend user permissions. In the background, it uses systemd-run<\/code> to start new processes, which has been in systemd for several years. <\/p>\n

PolKit is used when it comes to checking whether a user has the appropriate permissions to use run0<\/code>. All rules that the configuration of PolKit provides can be used here. In our example, we will concentrate on a simple variant. <\/p>\n

Experimental Setup<\/h2>\n

For our example, we use an t2.micro<\/code> EC2 instance with Debian Bookworm. Since run0<\/code> was only introduced in systemd version 256 and Debian Bookworm is still delivered with version 252 at the current time, we must first add the Debian Testing Repository. <\/p>\n

\u276f ssh admin@2a05:d014:ac8:7e00:c4f4:af36:3938:206e\n\u2026\n\nadmin@ip-172-31-15-135:~$ sudo su -\n\nroot@ip-172-31-15-135:~# cat  < \n\/etc\/apt\/sources.list.d\/testing.list\n>  deb https:\/\/deb.debian.org\/debian testing main\n> EOF\n\nroot@ip-172-31-15-135:~# apt update\nGet:1 file:\/etc\/apt\/mirrors\/debian.list Mirrorlist [38 B]\nGet:5 file:\/etc\/apt\/mirrors\/debian-security.list Mirrorlist [47 B]\nGet:7 https:\/\/deb.debian.org\/debian testing InRelease [169 kB]\nGet:2 https:\/\/cdn-aws.deb.debian.org\/debian bookworm InRelease [151 kB]\n\u2026\nFetched 41.3 MB in 6s (6791 kB\/s)\nReading package lists... Done \nBuilding dependency tree... Done \nReading state information... Done \n299 packages can be upgraded. Run 'apt list --upgradable' to see them. \n\nroot@ip-172-31-15-135:~# apt-cache policy systemd\nsystemd:\nInstalled: 252.17-1~deb12u1\nCandidate: 256.1-2\nVersion table:\n256.1-2 500\n500 https:\/\/deb.debian.org\/debian testing\/main amd64 Packages\n254.5-1~bpo12+3 100\n100 mirror+file:\/etc\/apt\/mirrors\/debian.list bookworm-backports\/main amd64 Packages\n252.22-1~deb12u1 500\n500 mirror+file:\/etc\/apt\/mirrors\/debian.list bookworm\/main amd64 Packages\n*** 252.17-1~deb12u1 100\n100 \/var\/lib\/dpkg\/status\nroot@ip-172-31-15-135:~# apt-get install systemd\n\u2026\n\nroot@ip-172-31-15-135:~# dpkg -l | grep systemd\nii libnss-resolve:amd64 256.1-2 amd64 nss module to resolve names via systemd-resolved\nii libpam-systemd:amd64 256.1-2 amd64 system and service manager - PAM module\nii libsystemd-shared:amd64 256.1-2 amd64 systemd shared private library\nii libsystemd0:amd64 256.1-2 amd64 systemd utility library\nii systemd 256.1-2 amd64 system and service manager\nii systemd-cryptsetup 256.1-2 amd64 Provides cryptsetup, integritysetup and veritysetup utilities\nii systemd-resolved 256.1-2 amd64 systemd DNS resolver\nii systemd-sysv 256.1-2 amd64 system and service manager - SysV compatibility symlinks\nii systemd-timesyncd 256.1-2 amd64 minimalistic service to synchronize local time with NTP servers\n\nroot@ip-172-31-15-135:~# reboot\n\u2026\n<\/pre>\n
The user admin<\/code> is used for the initial login. This user has already been stored in the file \/etc\/sudoers.d\/90-cloud-init-users<\/code> by cloud-init<\/code> and can therefore execute any sudo commands without being prompted for a password. <\/p>\n
sudo cat \/etc\/sudoers.d\/90-cloud-init-users\n# Created by cloud-init v. 22.4.2 on Thu, 27 Jun 2024 09:22:48 +0000\n\n# User rules for admin\nadmin ALL=(ALL) NOPASSWD:ALL\n<\/pre>\n
Analogous to sudo, we now want to enable run0<\/code> for the user admin<\/code>.<\/p>\n
Without further configuration, the user admin<\/code> receives a login prompt asking for the root<\/code> password. This is the default behavior of PolKit. <\/p>\n
admin@ip-172-31-15-135:~$  run0<\/code>  ==== AUTHENTICATING FOR org.freedesktop.systemd1.manage-units ==== Authentication is required to manage system services or other units. Authenticating as: Debian (admin) Password: <\/pre>\n
Since this does not correspond to the behavior we want, we have to help a little in the form of a PolKit rule. Additional PolKit rules are stored under \/etc\/polkit-1\/rules.d\/<\/code>. <\/p>\n
root@ip-172-31-15-135:~# cat  < \n\/etc\/polkit-1\/rules.d\/99-run0.rules\npolkit.addRule(function(action, subject) {\n  if (action.id = \"org.freedesktop.systemd1.manage-units\") {\n  if (subject.user === \"admin\") {\n  return polkit.Result.YES;\n  }\n  }\n});\n> EOF\n<\/pre>\n
The rule used is structured as follows: First, it is checked whether the action listed is org.freedesktop.systemd1.manage-units<\/code>. If this is the case, it is checked whether the executing user is the user <\/x>. If both requirements are met, our rule returns “YES”, which means that no further checks (e.g. password query) are necessary.  <\/p>\n
Alternatively, it could also be checked whether the executing user belongs to a specific group, such as admin<\/code> or sudo<\/code> (if (subject.isInGroup(\"admin\")<\/code>). It would also be conceivable to ask the user for their own password instead of the root<\/code> password. <\/p>\n
The new rule is automatically read in by PolKit and can be used immediately. Via <\/x> it can be checked whether there were any errors when reading in the new rules. After the configuration of PolKit, the user admin<\/code> can now execute run0<\/code> analogously to our initial sudo configuration.  <\/p>\n
Process Structure<\/h2>\n
The following listing shows the difference in the call stack between sudo and  run0<\/code>  While in the case of sudo, separate child processes are started, run0<\/code> starts a new process via systemd-run<\/code>. <\/p>\n
root@ip-172-31-15-135:~# sudo su -\nroot@ip-172-31-15-135:~# ps fo tty,ruser,ppid,pid,sess,cmd\nTT RUSER PPID PID SESS CMD\npts\/2 admin 1484 1514 1484 sudo su -\npts\/0 admin 1514 1515 1515 \\_ sudo su -\npts\/0 root 1515 1516 1515 \\_ su -\npts\/0 root 1516 1517 1515 \\_ -bash\npts\/0 root 1517 1522 1515 \\_ ps fo tty,ruser,ppid,pid,sess,cmd\n<\/pre>\n
admin@ip-172-31-15-135:~$ run0\nroot@ip-172-31-15-135:\/home\/admin# ps fo tty,ruser,ppid,pid,sess,cmd\nTT RUSER PPID PID SESS CMD\npts\/0 root 1 1562 1562 -\/bin\/bash\npts\/0 root 1562 1567 1562 \\_ ps fo tty,ruser,ppid,pid,sess,cmd\n<\/pre>\n
Conclusion and Note<\/h2>\n
As the example above has shown,  run0<\/code>  can generally be used as a simple sudo alternative and offers some security-relevant advantages. If run0<\/code> prevails over sudo, this will not happen within the next year. Some distributions simply lack a sufficiently up-to-date systemd version. In addition, the configuration of PolKit is not one of the daily tasks for some admins and know-how must first be built up here in order to transfer any existing sudo “constructs”.   <\/p>\n
In addition, a decisive advantage of run0<\/code> should not be ignored: By default, it colors the background red! \ud83d\ude09 <\/p>\n","protected":false},"excerpt":{"rendered":"
With version 256, systemd introduced run0. Lennart Poettering describes run0 as an alternative to sudo and explains on Mastodon at the same time what he sees as the problem with sudo. In this blog post, however, we do not want to go into the strengths or weaknesses of sudo, but take a closer look at […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_improvement_type_select":"improve_an_existing","_thumb_yes_seoaic":false,"_frame_yes_seoaic":false,"seoaic_generate_description":"","seoaic_improve_instructions_prompt":"","seoaic_rollback_content_improvement":"","seoaic_idea_thumbnail_generator":"","thumbnail_generated":false,"thumbnail_generate_prompt":"","seoaic_article_description":"","seoaic_article_subtitles":[],"footnotes":""},"categories":[1885],"tags":[1775,1842,2092,1876,2093,2094],"class_list":["post-9873","post","type-post","status-publish","format-standard","hentry","category-howtos-en","tag-debian-en","tag-linux-en","tag-run0","tag-sudo-en","tag-systemd","tag-systemd-run"],"acf":[],"yoast_head":"\nRun0 as a Sudo Alternative? 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