{"id":71808,"date":"2024-05-03T15:00:52","date_gmt":"2024-05-03T07:00:52","guid":{"rendered":"https:\/\/www.hongkiat.com\/blog\/?p=71808"},"modified":"2024-05-02T17:47:16","modified_gmt":"2024-05-02T09:47:16","slug":"linux-command-run0","status":"publish","type":"post","link":"https:\/\/www.hongkiat.com\/blog\/linux-command-run0\/","title":{"rendered":"run0 Command: An Alternative to sudo – What We Know So Far"},"content":{"rendered":"

The systemd project continues to revolutionize the Linux ecosystem with its latest addition: the run0<\/code> command.<\/p>\n

Announced recently by systemd lead developer Lennart Poettering<\/a>, run0<\/code> promises to reshape how we handle administrative tasks by offering a new, sudo-like utility.<\/p>\n

Unlike its predecessors, run0<\/code> introduces unique features that set it apart, potentially transforming how users interact with privileged commands.<\/p>\n

A Closer Look at run0<\/code><\/h2>\n

The run0<\/code> command is a new addition to the systemd toolset, although it builds on an existing systemd-run tool.<\/p>\n

The key difference lies in how run0<\/code> operates: when invoked through a symlink under the name \u201crun0<\/code>,\u201d it behaves as a sudo<\/a><\/code> clone, offering a streamlined way to execute commands with elevated privileges.<\/p>\n

However, run0<\/code> diverges from traditional sudo<\/code> usage in several significant ways.<\/p>\n

No SUID Needed<\/h3>\n

One of the most notable features of run0<\/code> is its approach to security. Unlike sudo<\/code>, run0<\/code> is not SUID-enabled.<\/p>\n

Instead, it works directly with the service manager to invoke a command or shell under the desired user\u2019s UID. This innovative design avoids potential security vulnerabilities associated with SUID binaries.<\/p>\n

The command allocates a new PTY (pseudo-terminal) for each session, shoveling data back and forth between the originating TTY and the new PTY.<\/p>\n

Isolated Execution Context<\/h3>\n

Another key difference between run0<\/code> and sudo<\/code> is how the former runs commands.<\/p>\n

With run0<\/code>, commands are invoked in a newly forked-off execution context, directly from PID 1. This approach ensures that commands do not inherit any context from the client, except for an explicit allowlist, such as the propagation of the $TERM variable.<\/p>\n

Visual Indicators<\/h3>\n

To make using run0<\/code> more intuitive, the command provides a visual cue when operating with elevated privileges.<\/p>\n

By default, run0<\/code> tints the terminal background with a reddish tone, serving as a reminder that elevated privileges are active. This tint also helps to distinguish output generated by commands run with privileges, adding an extra layer of clarity and security to administrative tasks.<\/p>\n

Comparisons to ssh and sudo<\/code><\/h3>\n

Poettering has noted that, in some ways, run0<\/code>\u2018s behavior is closer to ssh than sudo<\/code>. This comparison highlights run0<\/code>\u2018s design focus on isolation and security.<\/p>\n

While sudo<\/code> allows for direct execution of commands with root privileges, run0<\/code>\u2018s PTY allocation and isolated context create a more secure execution environment, resembling ssh\u2019s approach to remote command execution.<\/p>\n

Future Implications<\/h2>\n

As systemd continues to evolve, run0<\/code> is poised to play a pivotal role in Linux system administration. Its innovative design and focus on security make it an exciting addition to the systemd ecosystem. With features like isolated execution, visual indicators, and a secure PTY-based design, run0<\/code> offers a fresh take on handling privileged tasks.<\/p>\n

For those interested in trying it out, systemd\u2019s run0<\/code> will be available in systemd version 256, and further commentary from Poettering can be found on Mastodon.social<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"

The systemd project continues to revolutionize the Linux ecosystem with its latest addition: the run0 command. Announced recently by systemd lead developer Lennart Poettering, run0 promises to reshape how we handle administrative tasks by offering a new, sudo-like utility. Unlike its predecessors, run0 introduces unique features that set it apart, potentially transforming how users interact…<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[3398],"tags":[888,3316],"topic":[],"class_list":["entry-content","is-maxi"],"acf":[],"yoast_head":"\nrun0 Command: An Alternative to sudo - What We Know So Far - Hongkiat<\/title>\n<meta name=\"description\" content=\"The systemd project continues to revolutionize the Linux ecosystem with its latest addition: the run0 command. 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