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SUDO(8) sudo-rs SUDO(8)

NAME

sudo - execute a command as another user

SYNOPSIS

sudo [-u user] [-g group] [-D directory] [-BknS] [-i | -s] [VAR=value] [<command>]

sudo -h | -K | -k | -V

DESCRIPTION

sudo allows a user that is permitted to do so to execute a command as another user (for example root). Permissions are specified by a security policy specified in /etc/sudoers (see sudoers(5)).

Sudo-rs is a safety oriented and memory safe re-implementation of the original sudo implementation by Todd Miller.

When a command is run, a session record is stored for that specific session allowing users to run additional commands without having to re-authenticate. The timeout for session records can be specified in the policy.

Some care is taken to pass signals received by sudo-rs to the child process, even if that process runs in its own pseudo terminal.

OPTIONS

Ring the bell as part of the password prompt when a terminal is present.
Run the command in the specified directory instead of the current working directory. The security policy may return an error if the user does not have the permission to specify the working directory.
Use this group as the primary group instead of using the primary group specified in the password database for the target user.
Show a help message.
Run the shell specified by the target user’s password database entry as a login shell. This means that login-specific resource files such as .profile, .bash_profile or .login will be read by the shell. If a command is specified, it is passed to the shell using the -c option.
Removes every cached session record for the user, regardless of where the command is executed. The next time sudo-rs is run, authentication will take place if the policy requires it. No password is required to run this command.
When used without a command, invalidates the user’s session record for the current session. The next time sudo-rs is run, authentication will take place if the policy requires it.

When used in conjunction with a command or an option that may require a password, this option will cause sudo-rs to ignore the user’s session record. As a result, authentication will take place if the policy requires it. When used in conjunction with a command no invalidation of existing session records will take place.

Avoid prompting the user for input of any kind. If any input is required for the command to run, sudo-rs will display an error message and exit.
Use a custom authentication prompt with optional escape sequences. The following percent (`%') escape sequences are supported:


 %H  expanded to the local host name


 %h  expanded to the local host name without the domain name


 %p  expanded to the name of the user whose password is being requested


     (this respects the rootpw, targetpw flags)


 %U  expanded to the login name of the user the command will be run as


     (defaults to root unless the -u option is also specified)


 %u  expanded to the invoking user's login name


 %%  two consecutive ‘%’ characters are collapsed into a single ‘%’ character

The custom prompt will override the default prompt or the one specified by the SUDO_PROMPT enviroment variable. No prompt will suppress the the prompt provided by PAM, unless the requested prompt is empty ("")

Read from standard input instead of using the terminal device.
Run the shell specified by the SHELL environment variable. If no shell was specified, the shell from the user’s password database entry will be used instead. If a command is specified, it is passed to the shell using the -c option.
Run the command as another user than the default (root).
Display the current version of sudo-rs.
Update the session record for the current session, authenticating the user if necessary.
--
Indicates the end of the sudo-rs options and start of the command.

Environment variables to be set for the command may be passed on the command line in the form of VAR=value. Variables passed on the command line are subject to restrictions imposed by the security policy. Variables passed on the command line are subject to the same restrictions as normal environment variables with one important exception: If the command to be run has the SETENV tag set or the command matched is ALL, the user may set variables that would otherwise be forbidden. See sudoers(5) for more information.

SEE ALSO

su(1), sudoers(5), visudo(8)

sudo-rs 0.2.5