577 lines
16 KiB
Perl
577 lines
16 KiB
Perl
#!/usr/bin/perl
|
|
# -*- perl -*-
|
|
# Copyright 1995, 1996, 1997 Guy Helmer, Ames, Iowa 50014.
|
|
# 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.
|
|
#
|
|
# rmuser - Perl script to remove users
|
|
#
|
|
# Guy Helmer <ghelmer@cs.iastate.edu>, 02/23/97
|
|
#
|
|
# $Id: rmuser.perl,v 1.6 1997/03/08 18:04:45 wosch Exp $
|
|
|
|
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";
|
|
$affirm = 0;
|
|
|
|
#$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}: $!\n";
|
|
exit(1);
|
|
}
|
|
# Set the close-on-exec flag just in case
|
|
fcntl(MASTER_PW, &F_SETFD, 1);
|
|
# Apply an advisory lock the password file
|
|
if (!flock(MASTER_PW, &LOCK_EX|&LOCK_NB)) {
|
|
print STDERR "${whoami}: Error: 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 == 1 && $ARGV[0] eq '-y') {
|
|
shift @ARGV;
|
|
$affirm = 1;
|
|
}
|
|
|
|
if ($#ARGV > 0) {
|
|
print STDERR "usage: ${whoami} [-y] [username]\n";
|
|
exit(1);
|
|
}
|
|
|
|
if ($< != 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
|
|
$login_name = pop(@ARGV);
|
|
die "Sorry, login name must contain alphanumeric characters only.\n"
|
|
if ($login_name !~ /^[a-z0-9_][a-z0-9_\-]*$/);
|
|
} else {
|
|
if ($affirm) {
|
|
print STDERR "${whoami}: Error: -y option given without username!\n";
|
|
&unlockpw;
|
|
exit 1;
|
|
}
|
|
# 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}: Error: I'd rather not remove a user with a uid of 0.\n";
|
|
&unlockpw;
|
|
exit 1;
|
|
}
|
|
|
|
if (! $affirm) {
|
|
print "Matching password entry:\n\n$pw_ent\n\n";
|
|
|
|
$ans = &get_yn("Is this the entry you wish to remove? ");
|
|
|
|
if ($ans eq 'N') {
|
|
print "${whoami}: Informational: 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}: Informational: 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}: Informational: Home dir ${real_home_dir} is" .
|
|
" not owned by ${login_name} (uid ${dir_owner})\n," .
|
|
"\tso it won't be removed\n";
|
|
$remove_directory = 0;
|
|
}
|
|
}
|
|
|
|
if ($remove_directory && ! $affirm) {
|
|
$ans = &get_yn("Remove user's home directory ($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, $uid);
|
|
|
|
#
|
|
# Kill all the user's processes
|
|
|
|
&kill_users_processes($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($home_dir);
|
|
print STDERR " done.\n";
|
|
}
|
|
|
|
#
|
|
# Remove files related to the user from the mail directory
|
|
|
|
#&remove_files_from_dir($mail_dir, $login_name, $uid);
|
|
$file = "$mail_dir/$login_name";
|
|
if (-e $file || -l $file) {
|
|
print STDERR "Removing user's incoming mail file ${file}:";
|
|
unlink $file ||
|
|
print STDERR "\n${whoami}: Warning: unlink on $file failed ($!) - continuing\n";
|
|
print STDERR " done.\n";
|
|
}
|
|
|
|
#
|
|
# Remove some pop daemon's leftover file
|
|
|
|
$file = "$mail_dir/.${login_name}.pop";
|
|
if (-e $file || -l $file) {
|
|
print STDERR "Removing pop daemon's temporary mail file ${file}:";
|
|
unlink $file ||
|
|
print STDERR "\n${whoami}: Warning: unlink on $file failed ($!) - continuing\n";
|
|
print STDERR " done.\n";
|
|
}
|
|
|
|
#
|
|
# Remove files belonging to the user from the directories /tmp, /var/tmp,
|
|
# and /var/tmp/vi.recover. Note that this doesn't take care of the
|
|
# problem where a user may have directories or symbolic links in those
|
|
# directories -- only regular files are removed.
|
|
|
|
&remove_files_from_dir('/tmp', $login_name, $uid);
|
|
&remove_files_from_dir('/var/tmp', $login_name, $uid);
|
|
&remove_files_from_dir('/var/tmp/vi.recover', $login_name, $uid)
|
|
if (-e '/var/tmp/vi.recover');
|
|
|
|
#
|
|
# All done!
|
|
|
|
exit 0;
|
|
|
|
sub get_login_name {
|
|
#
|
|
# Get new user's name
|
|
local($done, $login_name);
|
|
|
|
for ($done = 0; ! $done; ) {
|
|
print "Enter login name for user to remove: ";
|
|
$login_name = <>;
|
|
chop $login_name;
|
|
if (!($login_name =~ /^[a-z0-9_][a-z0-9_\-]*$/)) {
|
|
print STDERR "Sorry, login name must contain alphanumeric characters only.\n";
|
|
} elsif (length($login_name) > 16 || length($login_name) == 0) {
|
|
print STDERR "Sorry, login name must be 16 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, $changes);
|
|
local($grname, $grpass, $grgid, $grmember_list, @grmembers);
|
|
|
|
$changes = 0;
|
|
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);
|
|
} else {
|
|
print STDERR " $grname";
|
|
$changes = 1;
|
|
}
|
|
}
|
|
if ($grname eq $login_name && $#new_grmembers == -1) {
|
|
# Remove a user's personal group if empty
|
|
print STDERR " (removing group $grname -- personal group is empty)";
|
|
$changes = 1;
|
|
} 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 " (no changes)" if (! $changes);
|
|
print STDERR " done.\n";
|
|
}
|
|
|
|
sub remove_dir {
|
|
# Remove the user's home directory
|
|
local($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', $dir);
|
|
}
|
|
|
|
sub remove_files_from_dir {
|
|
local($dir, $login_name, $uid) = @_;
|
|
local($path, $i, $owner);
|
|
|
|
print STDERR "Removing files belonging to ${login_name} from ${dir}:";
|
|
|
|
if (!opendir(DELDIR, $dir)) {
|
|
print STDERR "\n${whoami}: Warning: couldn't open directory ${dir} ($!)\n";
|
|
return;
|
|
}
|
|
while ($i = readdir(DELDIR)) {
|
|
next if $i eq '.';
|
|
next if $i eq '..';
|
|
|
|
$owner = (stat("$dir/$i"))[4]; # UID
|
|
if ($uid == $owner) {
|
|
if (-f "$dir/$i") {
|
|
print STDERR " $i";
|
|
unlink "$dir/$i" ||
|
|
print STDERR "\n${whoami}: Warning: unlink on ${dir}/${i} failed ($!) - continuing\n";
|
|
} else {
|
|
print STDERR " ($i not a regular file - skipped)";
|
|
}
|
|
}
|
|
}
|
|
closedir(DELDIR);
|
|
|
|
printf STDERR " done.\n";
|
|
}
|
|
|
|
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 $path;
|
|
}
|
|
|
|
sub kill_users_processes {
|
|
local($login_name, $uid) = @_;
|
|
local($pid, $result);
|
|
|
|
#
|
|
# Do something a little complex: fork a child that changes its
|
|
# real and effective UID to that of the removed user, then issues
|
|
# a "kill(9, -1)" to kill all processes of the same uid as the sender
|
|
# (see kill(2) for details).
|
|
# The parent waits for the exit of the child and then returns.
|
|
|
|
if ($pid = fork) {
|
|
# Parent process
|
|
waitpid($pid, 0);
|
|
} elsif (defined $pid) {
|
|
# Child process
|
|
$< = $uid;
|
|
$> = $uid;
|
|
if ($< != $uid || $> != $uid) {
|
|
print STDERR "${whoami}: Error (kill_users_processes):\n" .
|
|
"\tCouldn't reset uid/euid to ${uid}: current uid/euid's are $< and $>\n";
|
|
exit 1;
|
|
}
|
|
$result = kill(9, -1);
|
|
print STDERR "Killed process(es) belonging to $login_name.\n"
|
|
if $result;
|
|
exit 0;
|
|
} else {
|
|
# Couldn't fork!
|
|
print STDERR "${whoami}: Error: couldn't fork to kill ${login_name}'s processes - continuing\n";
|
|
}
|
|
}
|