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removeuser moved from /usr/share/examples/removeuser to /usr/sbin/rmuser

This commit is contained in:
Wolfram Schneider 1996-11-17 03:59:46 +00:00
parent 7232e09ce1
commit 24e41f4044
Notes: svn2git 2020-12-20 02:59:44 +00:00
svn path=/head/; revision=19834
4 changed files with 0 additions and 605 deletions

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Here lies removeuser(8) for FreeBSD 2.x. It will remove a user's
password entry, home directory, and incoming mail file from /var/mail.
Install removeuser.perl into /usr/local/sbin, /usr/sbin, or where ever
you like; install removeuser.8 into /usr/local/man/man8 or where ever.
I suggest these commands to install it:
install -c -o bin -g bin -m 555 removeuser.perl /usr/local/sbin/removeuser
install -c -o bin -g bin -m 444 removeuser.8 /usr/local/man/man8/removeuser.8

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# $Id: $
Deleting a user is a complex task:
DONE:
- delete password entry
- delete user from group database (/etc/group), may be delete groups
- remove home dir
- remove mailbox
- delete crontab entries (/etc/crontab, /var/cron/allow,
/var/cron/deny, /var/cron/tabs/user)
- delete at(8) entries
TODO:
- delete ppp password (/etc/ppp/*)
- delete slip entries (/etc/sliphome*)
- delete user from /etc/ftpusers
- check for other users with same uid (may be also for groups)
- remove WWW files (/~user), which are not in HOME located
- check other FS, $ find / -user user -print, delete suid/sgid bit,
remove files in /var/tmp
- delete user from /etc/inetd.conf, remove files which owned by user
- delete user from /etc/rc.local if the user start programs
- delete mail aliases (/etc/aliases, may be /etc/sendmail.cf)
- delete user phone numbers in /etc/phones
- remove quota
KNOWN BUGS:
- removeuser does not remove the HOME directory if the HOME
directory is a symbolic link.

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.\" Copyright 1995, 1996
.\" Guy Helmer, Madison, South Dakota 57042. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer as
.\" the first lines of this file unmodified.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. The name of the author may not be used to endorse or promote products
.\" derived from this software without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY GUY HELMER ``AS IS'' AND ANY EXPRESS OR
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
.\" IN NO EVENT SHALL GUY HELMER BE LIABLE FOR ANY DIRECT, INDIRECT,
.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.\" $Id$
.\"
.Dd July 16, 1996
.Dt REMOVEUSER 8
.Os
.Sh NAME
.Nm removeuser
.Nd remove users from the system
.Sh SYNOPSIS
.Nm removeuser
.Op Ar username
.Sh DESCRIPTION
The utility
.Nm removeuser
removes a user's
.Xr crontab 1
entry (if any) and any
.Xr at 1
jobs belonging to the user,
then removes a user from the system's local password file, removes
the user's home directory if it is owned by the user, and removes
the user's incoming mail file if it exists. The username is removed
from any groups to which it belongs in the file
.Pa /etc/group .
If a group becomes empty and the group name is the same as the username,
the group is removed (this complements
.Xr adduser 8 's
per-user unique groups).
.Pp
.Nm removeuser
politely refuses to remove users whose uid is 0 (typically root), since
it seemed like a good idea at the time
.Nm removeuser
was written.
.Pp
.Nm removeuser
shows the selected user's password file entry and asks for confirmation
that you wish to remove the user. If the user's home directory is owned
by the user (and not by any other user),
.Nm removeuser
asks whether you wish to remove the user's home directory and everything
below.
.Pp
Available options:
.Pp
.Bl -tag -width username
.It Ar \&username
Identifies the user to be removed; if not present,
.Nm removeuser
interactively asks for the user to be removed.
.Sh FILES
.Bl -tag -width /etc/master.passwd -compact
.It Pa /etc/master.passwd
.It Pa /etc/passwd
.It Pa /etc/group
.It Pa /etc/spwd.db
.It Pa /etc/pwd.db
.El
.Sh SEE ALSO
.Xr at 1 ,
.Xr chpass 1 ,
.Xr crontab 1 ,
.Xr finger 1 ,
.Xr passwd 1 ,
.Xr group 5 ,
.Xr passwd 5 ,
.Xr adduser 8 ,
.Xr pwd_mkdb 8 ,
.Xr vipw 8
.Sh HISTORY
The
.Nm
command appeared in FreeBSD 2.1.5
.\" .Sh AUTHOR
.\" Guy Helmer, Madison, South Dakota

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#!/usr/bin/perl
# -*- perl -*-
# Copyright 1995, 1996 Guy Helmer, Madison, South Dakota 57042.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer as
# the first lines of this file unmodified.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. The name of the author may not be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY GUY HELMER ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL GUY HELMER BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# /usr/sbin/removeuser
# Perl script to remove users
#
# Guy Helmer <ghelmer@alpha.dsu.edu>, 07/17/96
#
# $Id$
sub LOCK_SH {0x01;}
sub LOCK_EX {0x02;}
sub LOCK_NB {0x04;}
sub LOCK_UN {0x08;}
sub F_SETFD {2;}
$ENV{"PATH"} = "/bin:/sbin:/usr/bin:/usr/sbin";
umask(022);
$whoami = $0;
$passwd_file = "/etc/master.passwd";
$new_passwd_file = "${passwd_file}.new.$$";
$group_file = "/etc/group";
$new_group_file = "${group_file}.new.$$";
$mail_dir = "/var/mail";
$crontab_dir = "/var/cron/tabs";
$atjob_dir = "/var/at/jobs";
#$debug = 1;
sub cleanup {
local($sig) = @_;
print STDERR "Caught signal SIG$sig -- cleaning up.\n";
&unlockpw;
if (-e $new_passwd_file) {
unlink $new_passwd_file;
}
exit(0);
}
sub lockpw {
# Open the password file for reading
if (!open(MASTER_PW, "$passwd_file")) {
print STDERR "${whoami}: Error: Couldn't open ${passwd_file}: $!\n";
exit(1);
}
# Set the close-on-exec flag just in case
fcntl(MASTER_PW, &F_SETFD, 1);
# Apply an advisory lock the password file
if (!flock(MASTER_PW, &LOCK_EX|&LOCK_NB)) {
print STDERR "Couldn't lock ${passwd_file}: $!\n";
exit(1);
}
}
sub unlockpw {
flock(MASTER_PW, &LOCK_UN);
}
$SIG{'INT'} = 'cleanup';
$SIG{'QUIT'} = 'cleanup';
$SIG{'HUP'} = 'cleanup';
$SIG{'TERM'} = 'cleanup';
if ($#ARGV > 0) {
print STDERR "usage: ${whoami} [username]\n";
exit(1);
}
if ($< != 0) {
print STDERR "${whoami}: Error: you must be root to use ${whoami}\n";
exit(1);
}
&lockpw;
if ($#ARGV == 0) {
# Username was given as a parameter
$login_name = pop(@ARGV);
} else {
# Get the user name from the user
$login_name = &get_login_name;
}
if (($pw_ent = &check_login_name($login_name)) eq '0') {
print STDERR "${whoami}: Error: User ${login_name} not in password database\n";
&unlockpw;
exit 1;
}
($name, $password, $uid, $gid, $class, $change, $expire, $gecos, $home_dir,
$shell) = split(/:/, $pw_ent);
if ($uid == 0) {
print "${whoami}: Sorry, I'd rather not remove a user with a uid of 0.\n";
&unlockpw;
exit 1;
}
print "Matching password entry:\n\n$pw_ent\n\n";
$ans = &get_yn("Is this the entry you wish to remove? ");
if ($ans eq 'N') {
print "User ${login_name} not removed.\n";
&unlockpw;
exit 0;
}
#
# Get owner of user's home directory; don't remove home dir if not
# owned by $login_name
$remove_directory = 1;
if (-l $home_dir) {
$real_home_dir = &resolvelink($home_dir);
} else {
$real_home_dir = $home_dir;
}
#
# If home_dir is a symlink and points to something that isn't a directory,
# or if home_dir is not a symlink and is not a directory, don't remove
# home_dir -- seems like a good thing to do, but probably isn't necessary...
if (((-l $home_dir) && ((-e $real_home_dir) && !(-d $real_home_dir))) ||
(!(-l $home_dir) && !(-d $home_dir))) {
print STDERR "${whoami}: Home ${home_dir} is not a directory, so it won't be removed\n";
$remove_directory = 0;
}
if (length($real_home_dir) && -d $real_home_dir) {
$dir_owner = (stat($real_home_dir))[4]; # UID
if ($dir_owner != $uid) {
print STDERR "${whoami}: Home dir ${real_home_dir} is not owned by ${login_name} (uid ${dir_owner})\n";
$remove_directory = 0;
}
}
if ($remove_directory) {
$ans = &get_yn("Remove user's home directory ($home_dir)? ");
if ($ans eq 'N') {
$remove_directory = 0;
}
}
#exit 0 if $debug;
#
# Remove the user's crontab, if there is one
# (probably needs to be done before password databases are updated)
if (-e "$crontab_dir/$login_name") {
print STDERR "Removing user's crontab:";
system('/usr/bin/crontab', '-u', $login_name, '-r');
print STDERR " done.\n";
}
#
# Remove the user's at jobs, if any
# (probably also needs to be done before password databases are updated)
&remove_at_jobs($login_name, $uid);
#
# Copy master password file to new file less removed user's entry
&update_passwd_file;
#
# Remove the user from all groups in /etc/group
&update_group_file($login_name);
#
# Remove the user's home directory
if ($remove_directory) {
print STDERR "Removing user's home directory ($home_dir):";
&remove_dir($home_dir);
print STDERR " done.\n";
}
#
# Remove the user's incoming mail file
if (-e "$mail_dir/$login_name" || -l "$mail_dir/$login_name") {
print STDERR "Removing user's incoming mail file ($mail_dir/$login_name):";
unlink "$mail_dir/$login_name" ||
print STDERR "\n${whoami}: warning: unlink on $mail_dir/$login_name failed ($!) - continuing\n";
print STDERR " done.\n";
}
#
# All done!
exit 0;
sub get_login_name {
#
# Get new user's name
local($done, $login_name);
for ($done = 0; ! $done; ) {
print "Enter login name for user to remove: ";
$login_name = <>;
chop $login_name;
if (!($login_name =~ /[A-Za-z0-9_]/)) {
print STDERR "Sorry, login name must contain alphanumeric characters only.\n";
} elsif (length($login_name) > 8 || length($login_name) == 0) {
print STDERR "Sorry, login name must be eight characters or less.\n";
} else {
$done = 1;
}
}
print "User name is ${login_name}\n" if $debug;
return($login_name);
}
sub check_login_name {
#
# Check to see whether login name is in password file
local($login_name) = @_;
local($Mname, $Mpassword, $Muid, $Mgid, $Mclass, $Mchange, $Mexpire,
$Mgecos, $Mhome_dir, $Mshell);
local($i);
seek(MASTER_PW, 0, 0);
while ($i = <MASTER_PW>) {
chop $i;
($Mname, $Mpassword, $Muid, $Mgid, $Mclass, $Mchange, $Mexpire,
$Mgecos, $Mhome_dir, $Mshell) = split(/:/, $i);
if ($Mname eq $login_name) {
seek(MASTER_PW, 0, 0);
return($i); # User is in password database
}
}
seek(MASTER_PW, 0, 0);
return '0'; # User wasn't found
}
sub get_yn {
#
# Get a yes or no answer; return 'Y' or 'N'
local($prompt) = @_;
local($done, $ans);
for ($done = 0; ! $done; ) {
print $prompt;
$ans = <>;
chop $ans;
$ans =~ tr/a-z/A-Z/;
if (!($ans =~ /^[YN]/)) {
print STDERR "Please answer (y)es or (n)o.\n";
} else {
$done = 1;
}
}
return(substr($ans, 0, 1));
}
sub update_passwd_file {
local($skipped, $i);
print STDERR "Updating password file,";
seek(MASTER_PW, 0, 0);
open(NEW_PW, ">$new_passwd_file") ||
die "\n${whoami}: Error: Couldn't open file ${new_passwd_file}:\n $!\n";
chmod(0600, $new_passwd_file) ||
print STDERR "\n${whoami}: warning: couldn't set mode of $new_passwd_file to 0600 ($!)\n\tcontinuing, but please check mode of /etc/master.passwd!\n";
$skipped = 0;
while ($i = <MASTER_PW>) {
if ($i =~ /\n$/) {
chop $i;
}
if ($i ne $pw_ent) {
print NEW_PW "$i\n";
} else {
print STDERR "Dropped entry for $login_name\n" if $debug;
$skipped = 1;
}
}
close(NEW_PW);
seek(MASTER_PW, 0, 0);
if ($skipped == 0) {
print STDERR "\n${whoami}: Whoops! Didn't find ${login_name}'s entry second time around!\n";
unlink($new_passwd_file) ||
print STDERR "\n${whoami}: warning: couldn't unlink $new_passwd_file ($!)\n\tPlease investigate, as this file should not be left in the filesystem\n";
&unlockpw;
exit 1;
}
#
# Run pwd_mkdb to install the updated password files and databases
print STDERR " updating databases,";
system('/usr/sbin/pwd_mkdb', '-p', ${new_passwd_file});
print STDERR " done.\n";
close(MASTER_PW); # Not useful anymore
}
sub update_group_file {
local($login_name) = @_;
local($i, $j, $grmember_list, $new_grent);
local($grname, $grpass, $grgid, $grmember_list, @grmembers);
print STDERR "Updating group file:";
open(GROUP, $group_file) ||
die "\n${whoami}: Error: couldn't open ${group_file}: $!\n";
if (!flock(GROUP, &LOCK_EX|&LOCK_NB)) {
print STDERR "\n${whoami}: Error: couldn't lock ${group_file}: $!\n";
exit 1;
}
local($group_perms, $group_uid, $group_gid) =
(stat(GROUP))[2, 4, 5]; # File Mode, uid, gid
open(NEW_GROUP, ">$new_group_file") ||
die "\n${whoami}: Error: couldn't open ${new_group_file}: $!\n";
chmod($group_perms, $new_group_file) ||
printf STDERR "\n${whoami}: warning: could not set permissions of new group file to %o ($!)\n\tContinuing, but please check permissions of $group_file!\n", $group_perms;
chown($group_uid, $group_gid, $new_group_file) ||
print STDERR "\n${whoami}: warning: could not set owner/group of new group file to ${group_uid}/${group_gid} ($!)\n\rContinuing, but please check ownership of $group_file!\n";
while ($i = <GROUP>) {
if (!($i =~ /$login_name/)) {
# Line doesn't contain any references to the user, so just add it
# to the new file
print NEW_GROUP $i;
} else {
#
# Remove the user from the group
if ($i =~ /\n$/) {
chop $i;
}
($grname, $grpass, $grgid, $grmember_list) = split(/:/, $i);
@grmembers = split(/,/, $grmember_list);
undef @new_grmembers;
local(@new_grmembers);
foreach $j (@grmembers) {
if ($j ne $login_name) {
push(new_grmembers, $j);
} elsif ($debug) {
print STDERR "Removing $login_name from group $grname\n";
}
}
if ($grname eq $login_name && $#new_grmembers == -1) {
# Remove a user's personal group if empty
print STDERR "Removing group $grname -- personal group is empty\n";
} else {
$grmember_list = join(',', @new_grmembers);
$new_grent = join(':', $grname, $grpass, $grgid, $grmember_list);
print NEW_GROUP "$new_grent\n";
}
}
}
close(NEW_GROUP);
rename($new_group_file, $group_file) || # Replace old group file with new
die "\n${whoami}: error: couldn't rename $new_group_file to $group_file ($!)\n";
close(GROUP); # File handle is worthless now
print STDERR " done.\n";
}
sub remove_dir {
# Remove the user's home directory
local($dir) = @_;
local($linkdir);
if (-l $dir) {
$linkdir = &resolvelink($dir);
# Remove the symbolic link
unlink($dir) ||
warn "${whoami}: Warning: could not unlink symlink $dir: $!\n";
if (!(-e $linkdir)) {
#
# Dangling symlink - just return now
return;
}
# Set dir to be the resolved pathname
$dir = $linkdir;
}
if (!(-d $dir)) {
print STDERR "${whoami}: Warning: $dir is not a directory\n";
unlink($dir) || warn "${whoami}: Warning: could not unlink $dir: $!\n";
return;
}
system('/bin/rm', '-rf', $dir);
}
sub remove_at_jobs {
local($login_name, $uid) = @_;
local($i, $owner, $found);
$found = 0;
opendir(ATDIR, $atjob_dir) || return;
while ($i = readdir(ATDIR)) {
next if $i eq '.';
next if $i eq '..';
next if $i eq '.lockfile';
$owner = (stat("$atjob_dir/$i"))[4]; # UID
if ($uid == $owner) {
if (!$found) {
print STDERR "Removing user's at jobs:";
$found = 1;
}
# Use atrm to remove the job
print STDERR " $i";
system('/usr/bin/atrm', $i);
}
}
closedir(ATDIR);
if ($found) {
print STDERR " done.\n";
}
}
sub resolvelink {
local($path) = @_;
local($l);
while (-l $path && -e $path) {
if (!defined($l = readlink($path))) {
die "${whoami}: readlink on $path failed (but it should have worked!): $!\n";
}
if ($l =~ /^\//) {
# Absolute link
$path = $l;
} else {
# Relative link
$path =~ s/\/[^\/]+\/?$/\/$l/; # Replace last component of path
}
}
return $path;
}