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diff --git a/docs/visudo.man.in b/docs/visudo.man.in new file mode 100644 index 0000000..3867838 --- /dev/null +++ b/docs/visudo.man.in @@ -0,0 +1,516 @@ +.\" Automatically generated from an mdoc input file. Do not edit. +.\" +.\" SPDX-License-Identifier: ISC +.\" +.\" Copyright (c) 1996,1998-2005, 2007-2023 +.\" Todd C. Miller <Todd.Miller@sudo.ws> +.\" +.\" Permission to use, copy, modify, and distribute this software for any +.\" purpose with or without fee is hereby granted, provided that the above +.\" copyright notice and this permission notice appear in all copies. +.\" +.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES +.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF +.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR +.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES +.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN +.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF +.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. +.\" +.\" Sponsored in part by the Defense Advanced Research Projects +.\" Agency (DARPA) and Air Force Research Laboratory, Air Force +.\" Materiel Command, USAF, under agreement number F39502-99-1-0512. +.\" +.TH "VISUDO" "@mansectsu@" "January 16, 2023" "Sudo @PACKAGE_VERSION@" "System Manager's Manual" +.nh +.if n .ad l +.SH "NAME" +\fBvisudo\fR +\- edit the sudoers file +.SH "SYNOPSIS" +.HP 7n +\fBvisudo\fR +[\fB\-chIOPqsV\fR] +[[\fB\-f\fR]\ \fIsudoers\fR] +.SH "DESCRIPTION" +\fBvisudo\fR +edits the +\fIsudoers\fR +file in a safe fashion, analogous to +vipw(@mansectsu@). +\fBvisudo\fR +locks the +\fIsudoers\fR +file against multiple simultaneous edits, performs basic validity checks, +and checks for syntax errors before installing the edited file. +If the +\fIsudoers\fR +file is currently being edited you will receive a message to try again later. +.PP +\fBvisudo\fR +parses the +\fIsudoers\fR +file after editing and will not save the changes if there is a syntax error. +Upon finding an error, +\fBvisudo\fR +will print a message stating the line number(s) +where the error occurred and the user will receive the +\(lqWhat now?\(rq +prompt. +At this point the user may enter +\(oqe\(cq +to re-edit the +\fIsudoers\fR +file, +\(oqx\(cq +to exit without saving the changes, or +\(oqQ\(cq +to quit and save changes. +The +\(oqQ\(cq +option should be used with extreme caution because if +\fBvisudo\fR +believes there to be a syntax error, so will +\fBsudo\fR. +If +\(oqe\(cq +is typed to edit the +\fIsudoers\fR +file after a syntax error has been detected, the cursor will be placed on +the line where the error occurred (if the editor supports this feature). +.PP +There are two +\fIsudoers\fR +settings that determine which editor +\fBvisudo\fR +will run. +.TP 12n +editor +A colon +(\(oq:\&\(cq) +separated list of editors allowed to be used with +\fBvisudo\fR. +\fBvisudo\fR +will choose the editor that matches the user's +\fRSUDO_EDITOR\fR, +\fRVISUAL\fR, +or +\fREDITOR\fR +environment variable if possible, or the first editor in the +list that exists and is executable. +\fBsudo\fR +does not preserve the +\fRSUDO_EDITOR\fR, +\fRVISUAL\fR, +or +\fREDITOR\fR +environment variables unless they are present in the +\fIenv_keep\fR +list or the +\fIenv_reset\fR +option is disabled in the +\fIsudoers\fR +file. +The default editor path is +\fI@editor@\fR +which can be set at compile time via the +\fR--with-editor\fR +configure option. +.TP 12n +env_editor +If set, +\fBvisudo\fR +will use the value of the +\fRSUDO_EDITOR\fR, +\fRVISUAL\fR, +or +\fREDITOR\fR +environment variables before falling back on the default editor list. +\fBvisudo\fR +is typically run as root so this option may allow a user with +\fBvisudo\fR +privileges to run arbitrary commands as root without logging. +An alternative is to place a colon-separated list of +\(lqsafe\(rq +editors in the +\fIeditor\fR +variable. +\fBvisudo\fR +will then only use +\fRSUDO_EDITOR\fR, +\fRVISUAL\fR, +or +\fREDITOR\fR +if they match a value specified in +\fIeditor\fR. +If the +\fIenv_reset\fR +flag is enabled, the +\fRSUDO_EDITOR\fR, +\fRVISUAL\fR, +and/or +\fREDITOR\fR +environment variables must be present in the +\fIenv_keep\fR +list for the +\fIenv_editor\fR +flag to function when +\fBvisudo\fR +is invoked via +\fBsudo\fR. +The default value is +\fI@env_editor@\fR, +which can be set at compile time via the +\fR--with-env-editor\fR +configure option. +.PP +The options are as follows: +.TP 8n +\fB\-c\fR, \fB\--check\fR +Enable +\fIcheck-only\fR +mode. +The existing +\fIsudoers\fR +file (and any other files it includes) will be +checked for syntax errors. +If the path to the +\fIsudoers\fR +file was not specified, +\fBvisudo\fR +will also check the file ownership and permissions (see the +\fB\-O\fR +and +\fB\-P\fR +options). +A message will be printed to the standard output describing the status of +\fIsudoers\fR +unless the +\fB\-q\fR +option was specified. +If the check completes successfully, +\fBvisudo\fR +will exit with a value of 0. +If an error is encountered, +\fBvisudo\fR +will exit with a value of 1. +.TP 8n +\fB\-f\fR \fIsudoers\fR, \fB\--file\fR=\fIsudoers\fR +Specify an alternate +\fIsudoers\fR +file location, see below. +As of version 1.8.27, the +\fIsudoers\fR +path can be specified without using the +\fB\-f\fR +option. +.TP 8n +\fB\-h\fR, \fB\--help\fR +Display a short help message to the standard output and exit. +.TP 8n +\fB\-I\fR, \fB\--no-includes\fR +Disable the editing of include files unless there is a pre-existing +syntax error. +By default, +\fBvisudo\fR +will edit the main +\fIsudoers\fR +file and any files included via +\fI@include\fR +or +\fI#include\fR +directives. +Files included via +\fI@includedir\fR +or +\fI#includedir\fR +are never edited unless they contain a syntax error. +.TP 8n +\fB\-O\fR, \fB\--owner\fR +Enforce the default ownership (user and group) of the +\fIsudoers\fR +file. +In edit mode, the owner of the edited file will be set to the default. +In check mode +(\fB\-c\fR), +an error will be reported if the owner is incorrect. +This option is enabled by default if the +\fIsudoers\fR +file was not specified. +.TP 8n +\fB\-P\fR, \fB\--perms\fR +Enforce the default permissions (mode) of the +\fIsudoers\fR +file. +In edit mode, the permissions of the edited file will be set to the default. +In check mode +(\fB\-c\fR), +an error will be reported if the file permissions are incorrect. +This option is enabled by default if the +\fIsudoers\fR +file was not specified. +.TP 8n +\fB\-q\fR, \fB\--quiet\fR +Enable +\fIquiet\fR +mode. +In this mode details about syntax errors are not printed. +This option is only useful when combined with +the +\fB\-c\fR +option. +.TP 8n +\fB\-s\fR, \fB\--strict\fR +Enable +\fIstrict\fR +checking of the +\fIsudoers\fR +file. +If an alias is referenced but not actually defined +or if there is a cycle in an alias, +\fBvisudo\fR +will consider this a syntax error. +It is not possible to differentiate between an alias and a host +name or user name that consists solely of uppercase letters, digits, +and the underscore +(\(oq_\(cq) +character. +.TP 8n +\fB\-V\fR, \fB\--version\fR +Print the +\fBvisudo\fR +and +\fIsudoers\fR +grammar versions and exit. +.PP +A +\fIsudoers\fR +file may be specified instead of the default, +\fI@sysconfdir@/sudoers\fR. +The temporary file used is the specified +\fIsudoers\fR +file with +\(lq\.tmp\(rq +appended to it. +In +\fIcheck-only\fR +mode only, +\(oq-\(cq +may be used to indicate that +\fIsudoers\fR +will be read from the standard input. +Because the policy is evaluated in its entirety, it is not sufficient +to check an individual +\fIsudoers\fR +include file for syntax errors. +.SS "Debugging and sudoers plugin arguments" +\fBvisudo\fR +versions 1.8.4 and higher support a flexible debugging framework +that is configured via +\fIDebug\fR +lines in the +sudo.conf(@mansectform@) +file. +.PP +Starting with +\fBsudo\fR +1.8.12, +\fBvisudo\fR +will also parse the arguments to the +\fIsudoers\fR +plugin to override the default +\fIsudoers\fR +path name, user-ID, group-ID, and file mode. +These arguments, if present, should be listed after the path to the plugin +(i.e., after +\fI@sudoers_plugin@\fR). +Multiple arguments may be specified, separated by white space. +For example: +.nf +.sp +.RS 4n +Plugin sudoers_policy @sudoers_plugin@ sudoers_mode=0400 +.RE +.fi +.PP +The following arguments are supported: +.TP 6n +sudoers_file=pathname +The +\fIsudoers_file\fR +argument can be used to override the default path to the +\fIsudoers\fR +file. +.TP 6n +sudoers_uid=user-ID +The +\fIsudoers_uid\fR +argument can be used to override the default owner of the sudoers file. +It should be specified as a numeric user-ID. +.TP 6n +sudoers_gid=group-ID +The +\fIsudoers_gid\fR +argument can be used to override the default group of the sudoers file. +It must be specified as a numeric group-ID (not a group name). +.TP 6n +sudoers_mode=mode +The +\fIsudoers_mode\fR +argument can be used to override the default file mode for the sudoers file. +It should be specified as an octal value. +.PP +For more information on configuring +sudo.conf(@mansectform@), +refer to its manual. +.SH "ENVIRONMENT" +The following environment variables may be consulted depending on +the value of the +\fIeditor\fR +and +\fIenv_editor\fR +\fIsudoers\fR +settings: +.TP 17n +\fRSUDO_EDITOR\fR +Invoked by +\fBvisudo\fR +as the editor to use +.TP 17n +\fRVISUAL\fR +Used by +\fBvisudo\fR +if +\fRSUDO_EDITOR\fR +is not set +.TP 17n +\fREDITOR\fR +Used by +\fBvisudo\fR +if neither +\fRSUDO_EDITOR\fR +nor +\fRVISUAL\fR +is set +.SH "FILES" +.TP 26n +\fI@sysconfdir@/sudo.conf\fR +Sudo front-end configuration +.TP 26n +\fI@sysconfdir@/sudoers\fR +List of who can run what +.TP 26n +\fI@sysconfdir@/sudoers.tmp\fR +Default temporary file used by visudo +.SH "DIAGNOSTICS" +In addition to reporting +\fIsudoers\fR +syntax errors, +\fBvisudo\fR +may produce the following messages: +.TP 6n +\fRsudoers file busy, try again later.\fR +Someone else is currently editing the +\fIsudoers\fR +file. +.TP 6n +\fR@sysconfdir@/sudoers: Permission denied\fR +You didn't run +\fBvisudo\fR +as root. +.TP 6n +\fRyou do not exist in the passwd database\fR +Your user-ID does not appear in the system passwd database. +.TP 6n +\fRWarning: {User,Runas,Host,Cmnd}_Alias referenced but not defined\fR +Either you are trying to use an undeclared {User,Runas,Host,Cmnd}_Alias +or you have a user or host name listed that consists solely of +uppercase letters, digits, and the underscore +(\(oq_\(cq) +character. +In the latter case, you can ignore the warnings +(\fBsudo\fR +will not complain) +\&. +The message is prefixed with the path name of the +\fIsudoers\fR +file and the line number where the undefined alias was used. +In +\fB\-s\fR +(strict) mode these are errors, not warnings. +.TP 6n +\fRWarning: unused {User,Runas,Host,Cmnd}_Alias\fR +The specified {User,Runas,Host,Cmnd}_Alias was defined but never +used. +The message is prefixed with the path name of the +\fIsudoers\fR +file and the line number where the unused alias was defined. +You may wish to comment out or remove the unused alias. +.TP 6n +\fRWarning: cycle in {User,Runas,Host,Cmnd}_Alias\fR +The specified {User,Runas,Host,Cmnd}_Alias includes a reference to +itself, either directly or through an alias it includes. +The message is prefixed with the path name of the +\fIsudoers\fR +file and the line number where the cycle was detected. +This is only a warning unless +\fBvisudo\fR +is run in +\fB\-s\fR +(strict) mode as +\fBsudo\fR +will ignore cycles when parsing +the +\fIsudoers\fR +file. +.TP 6n +\fRunknown defaults entry \&"name\&"\fR +The +\fIsudoers\fR +file contains a +\fIDefaults\fR +setting not recognized by +\fBvisudo\fR. +.SH "SEE ALSO" +vi(1), +sudo.conf(@mansectform@), +sudoers(@mansectform@), +sudo(@mansectsu@), +vipw(@mansectsu@) +.SH "AUTHORS" +Many people have worked on +\fBsudo\fR +over the years; this version consists of code written primarily by: +.sp +.RS 6n +Todd C. Miller +.RE +.PP +See the CONTRIBUTORS.md file in the +\fBsudo\fR +distribution (https://www.sudo.ws/about/contributors/) for an +exhaustive list of people who have contributed to +\fBsudo\fR. +.SH "CAVEATS" +There is no easy way to prevent a user from gaining a root shell if +the editor used by +\fBvisudo\fR +allows shell escapes. +.SH "BUGS" +If you believe you have found a bug in +\fBvisudo\fR, +you can submit a bug report at https://bugzilla.sudo.ws/ +.SH "SUPPORT" +Limited free support is available via the sudo-users mailing list, +see https://www.sudo.ws/mailman/listinfo/sudo-users to subscribe or +search the archives. +.SH "DISCLAIMER" +\fBvisudo\fR +is provided +\(lqAS IS\(rq +and any express or implied warranties, including, but not limited +to, the implied warranties of merchantability and fitness for a +particular purpose are disclaimed. +See the LICENSE.md file distributed with +\fBsudo\fR +or https://www.sudo.ws/about/license/ for complete details. |