3 # Copyright 1995, 1996, 1997 Guy Helmer, Ames, Iowa 50014.
6 # Redistribution and use in source and binary forms, with or without
7 # modification, are permitted provided that the following conditions
9 # 1. Redistributions of source code must retain the above copyright
10 # notice, this list of conditions and the following disclaimer as
11 # the first lines of this file unmodified.
12 # 2. Redistributions in binary form must reproduce the above copyright
13 # notice, this list of conditions and the following disclaimer in the
14 # documentation and/or other materials provided with the distribution.
15 # 3. The name of the author may not be used to endorse or promote products
16 # derived from this software without specific prior written permission.
18 # THIS SOFTWARE IS PROVIDED BY GUY HELMER ``AS IS'' AND ANY EXPRESS OR
19 # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 # IN NO EVENT SHALL GUY HELMER BE LIABLE FOR ANY DIRECT, INDIRECT,
22 # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 # rmuser - Perl script to remove users
31 # Guy Helmer <ghelmer@cs.iastate.edu>, 02/23/97
33 # $FreeBSD: src/usr.sbin/adduser/rmuser.perl,v 1.8.2.9 2002/02/14 10:32:53 yar Exp $
43 $ENV{"PATH"} = "/bin:/sbin:/usr/bin:/usr/sbin";
46 $passwd_file = "/etc/master.passwd";
47 $passwd_tmp = "/etc/ptmp";
48 $group_file = "/etc/group";
49 $new_group_file = "${group_file}.new.$$";
50 $mail_dir = "/var/mail";
51 $crontab_dir = "/var/cron/tabs";
59 print STDERR "Caught signal SIG$sig -- cleaning up.\n";
61 if (-e $new_passwd_file) {
62 unlink $new_passwd_file;
68 # Open the password file for reading
69 if (!open(MASTER_PW, "$passwd_file")) {
70 print STDERR "${whoami}: Error: Couldn't open ${passwd_file}: $!\n";
73 # Set the close-on-exec flag just in case
74 fcntl(MASTER_PW, &F_SETFD, 1);
75 # Apply an advisory lock the password file
76 if (!flock(MASTER_PW, &LOCK_EX|&LOCK_NB)) {
77 print STDERR "${whoami}: Error: Couldn't lock ${passwd_file}: $!\n";
83 flock(MASTER_PW, &LOCK_UN);
86 $SIG{'INT'} = 'cleanup';
87 $SIG{'QUIT'} = 'cleanup';
88 $SIG{'HUP'} = 'cleanup';
89 $SIG{'TERM'} = 'cleanup';
91 if ($#ARGV == 1 && $ARGV[0] eq '-y') {
97 print STDERR "usage: ${whoami} [-y] [username]\n";
102 print STDERR "${whoami}: Error: you must be root to use ${whoami}\n";
109 # Username was given as a parameter
110 $login_name = pop(@ARGV);
113 print STDERR "${whoami}: Error: -y option given without username!\n";
117 # Get the user name from the user
118 $login_name = &get_login_name;
121 ($name, $password, $uid, $gid, $change, $class, $gecos, $home_dir, $shell) =
122 (getpwnam("$login_name"));
125 print STDERR "${whoami}: Error: User ${login_name} not in password database\n";
131 print "${whoami}: Error: I'd rather not remove a user with a uid of 0.\n";
137 print "Matching password entry:\n\n$name\:$password\:$uid\:$gid\:$class\:$change\:0\:$gecos\:$home_dir\:$shell\n\n";
139 $ans = &get_yn("Is this the entry you wish to remove? ");
142 print "${whoami}: Informational: User ${login_name} not removed.\n";
149 # Get owner of user's home directory; don't remove home dir if not
150 # owned by $login_name
152 $remove_directory = 1;
155 $real_home_dir = &resolvelink($home_dir);
157 $real_home_dir = $home_dir;
161 # If home_dir is a symlink and points to something that isn't a directory,
162 # or if home_dir is not a symlink and is not a directory, don't remove
163 # home_dir -- seems like a good thing to do, but probably isn't necessary...
165 if (((-l $home_dir) && ((-e $real_home_dir) && !(-d $real_home_dir))) ||
166 (!(-l $home_dir) && !(-d $home_dir))) {
167 print STDERR "${whoami}: Informational: Home ${home_dir} is not a directory, so it won't be removed\n";
168 $remove_directory = 0;
171 if (length($real_home_dir) && -d $real_home_dir) {
172 $dir_owner = (stat($real_home_dir))[4]; # UID
173 if ($dir_owner != $uid) {
174 print STDERR "${whoami}: Informational: Home dir ${real_home_dir} is" .
175 " not owned by ${login_name} (uid ${dir_owner})\n," .
176 "\tso it won't be removed\n";
177 $remove_directory = 0;
181 if ($remove_directory && ! $affirm) {
182 $ans = &get_yn("Remove user's home directory ($home_dir)? ");
184 $remove_directory = 0;
191 # Remove the user's crontab, if there is one
192 # (probably needs to be done before password databases are updated)
194 if (-e "$crontab_dir/$login_name") {
195 print STDERR "Removing user's crontab:";
196 system('/usr/bin/crontab', '-u', $login_name, '-r');
197 print STDERR " done.\n";
201 # Remove the user's at jobs, if any
202 # (probably also needs to be done before password databases are updated)
204 &remove_at_jobs($login_name);
207 # Kill all the user's processes
209 &kill_users_processes($login_name, $uid);
212 # Copy master password file to new file less removed user's entry
217 # Remove the user from all groups in /etc/group
219 &update_group_file($login_name);
222 # Remove the user's home directory
224 if ($remove_directory) {
225 print STDERR "Removing user's home directory ($home_dir):";
226 &remove_dir($home_dir);
227 print STDERR " done.\n";
231 # Remove files related to the user from the mail directory
233 #&remove_files_from_dir($mail_dir, $login_name, $uid);
234 $file = "$mail_dir/$login_name";
235 if (-e $file || -l $file) {
236 print STDERR "Removing user's incoming mail file ${file}:";
238 print STDERR "\n${whoami}: Warning: unlink on $file failed ($!) - continuing\n";
239 print STDERR " done.\n";
243 # Remove some pop daemon's leftover file
245 $file = "$mail_dir/.${login_name}.pop";
246 if (-e $file || -l $file) {
247 print STDERR "Removing pop daemon's temporary mail file ${file}:";
249 print STDERR "\n${whoami}: Warning: unlink on $file failed ($!) - continuing\n";
250 print STDERR " done.\n";
254 # Remove files belonging to the user from the directories /tmp, /var/tmp,
255 # and /var/tmp/vi.recover. Note that this doesn't take care of the
256 # problem where a user may have directories or symbolic links in those
257 # directories -- only regular files are removed.
259 &remove_files_from_dir('/tmp', $login_name, $uid);
260 &remove_files_from_dir('/var/tmp', $login_name, $uid);
261 &remove_files_from_dir('/var/tmp/vi.recover', $login_name, $uid)
262 if (-e '/var/tmp/vi.recover');
271 # Get new user's name
272 local($done, $login_name);
274 for ($done = 0; ! $done; ) {
275 print "Enter login name for user to remove: ";
278 if (not getpwnam("$login_name")) {
279 print STDERR "Sorry, login name not in password database.\n";
285 print "User name is ${login_name}\n" if $debug;
291 # Get a yes or no answer; return 'Y' or 'N'
295 for ($done = 0; ! $done; ) {
300 if (!($ans =~ /^[YN]/)) {
301 print STDERR "Please answer (y)es or (n)o.\n";
307 return(substr($ans, 0, 1));
310 sub update_passwd_file {
313 print STDERR "Updating password file,";
314 seek(MASTER_PW, 0, 0);
316 sysopen(NEW_PW, $passwd_tmp, O_RDWR|O_CREAT|O_EXCL, 0600) ||
317 die "\n${whoami}: Error: Couldn't open file ${passwd_tmp}:\n $!\n";
320 while (<MASTER_PW>) {
321 if (/^\Q$login_name:/o) {
322 print STDERR "Dropped entry for $login_name\n" if $debug;
326 # The other perl password tools assume all lowercase entries.
327 # Add a warning to help unsuspecting admins who might be
328 # using the wrong tool for the job, or might otherwise
329 # be unwittingly holding a loaded foot-shooting device.
330 if (/^\Q$login_name:/io) {
333 print STDERR "\n\n\tThere is also an entry for $name in your",
334 "password file.\n\tThis can cause problems in some ",
340 seek(MASTER_PW, 0, 0);
343 print STDERR "\n${whoami}: Whoops! Didn't find ${login_name}'s entry second time around!\n";
344 unlink($passwd_tmp) ||
345 print STDERR "\n${whoami}: Warning: couldn't unlink $passwd_tmp ($!)\n\tPlease investigate, as this file should not be left in the filesystem\n";
351 # Run pwd_mkdb to install the updated password files and databases
353 print STDERR " updating databases,";
354 system('/usr/sbin/pwd_mkdb', '-p', ${passwd_tmp});
355 print STDERR " done.\n";
357 close(MASTER_PW); # Not useful anymore
360 sub update_group_file {
361 local($login_name) = @_;
363 local($i, $j, $grmember_list, $new_grent, $changes);
364 local($grname, $grpass, $grgid, $grmember_list, @grmembers);
367 print STDERR "Updating group file:";
368 open(GROUP, $group_file) ||
369 die "\n${whoami}: Error: couldn't open ${group_file}: $!\n";
370 if (!flock(GROUP, &LOCK_EX|&LOCK_NB)) {
371 print STDERR "\n${whoami}: Error: couldn't lock ${group_file}: $!\n";
374 local($group_perms, $group_uid, $group_gid) =
375 (stat(GROUP))[2, 4, 5]; # File Mode, uid, gid
376 open(NEW_GROUP, ">$new_group_file") ||
377 die "\n${whoami}: Error: couldn't open ${new_group_file}: $!\n";
378 chmod($group_perms, $new_group_file) ||
379 printf STDERR "\n${whoami}: Warning: could not set permissions of new group file to %o ($!)\n\tContinuing, but please check permissions of $group_file!\n", $group_perms;
380 chown($group_uid, $group_gid, $new_group_file) ||
381 print STDERR "\n${whoami}: Warning: could not set owner/group of new group file to ${group_uid}/${group_gid} ($!)\n\rContinuing, but please check ownership of $group_file!\n";
382 while ($i = <GROUP>) {
383 if (!($i =~ /\Q$login_name\E/)) {
384 # Line doesn't contain any references to the user, so just add it
389 # Remove the user from the group
393 ($grname, $grpass, $grgid, $grmember_list) = split(/:/, $i);
394 @grmembers = split(/,/, $grmember_list);
395 undef @new_grmembers;
396 local(@new_grmembers);
397 foreach $j (@grmembers) {
398 if ($j ne $login_name) {
399 push(@new_grmembers, $j);
401 print STDERR " $grname";
405 if ($grname eq $login_name && $#new_grmembers == -1) {
406 # Remove a user's personal group if empty
407 print STDERR " (removing group $grname -- personal group is empty)";
410 $grmember_list = join(',', @new_grmembers);
411 $new_grent = join(':', $grname, $grpass, $grgid, $grmember_list);
412 print NEW_GROUP "$new_grent\n";
417 rename($new_group_file, $group_file) || # Replace old group file with new
418 die "\n${whoami}: Error: couldn't rename $new_group_file to $group_file ($!)\n";
419 close(GROUP); # File handle is worthless now
420 print STDERR " (no changes)" if (! $changes);
421 print STDERR " done.\n";
425 # Remove the user's home directory
430 $linkdir = &resolvelink($dir);
431 # Remove the symbolic link
433 warn "${whoami}: Warning: could not unlink symlink $dir: $!\n";
434 if (!(-e $linkdir)) {
436 # Dangling symlink - just return now
439 # Set dir to be the resolved pathname
443 print STDERR "${whoami}: Warning: $dir is not a directory\n";
444 unlink($dir) || warn "${whoami}: Warning: could not unlink $dir: $!\n";
447 system('/bin/rm', '-rf', $dir);
450 sub remove_files_from_dir {
451 local($dir, $login_name, $uid) = @_;
452 local($path, $i, $owner);
454 print STDERR "Removing files belonging to ${login_name} from ${dir}:";
456 if (!opendir(DELDIR, $dir)) {
457 print STDERR "\n${whoami}: Warning: couldn't open directory ${dir} ($!)\n";
460 while ($i = readdir(DELDIR)) {
464 $owner = (stat("$dir/$i"))[4]; # UID
465 if ($uid == $owner) {
469 print STDERR "\n${whoami}: Warning: unlink on ${dir}/${i} failed ($!) - continuing\n";
471 print STDERR " ($i not a regular file - skipped)";
477 printf STDERR " done.\n";
483 my($user) = (shift || "");
484 my($path_atq) = "/usr/bin/atq";
488 return @at if ($user eq "");
490 if (!defined($pid = open(ATQ, "-|"))) {
491 die("creating pipe to atq: $!\n");
492 } elsif ($pid == 0) {
493 exec($path_atq, $user);
494 die("executing $path_atq: $!\n");
497 while(defined($_ = <ATQ>)) {
499 if (/^\d\d.\d\d.\d\d\s+\d\d.\d\d.\d\d\s+(\S+)\s+\S+\s+(\d+)$/) {
500 push(@at, $2) if ($1 eq $user);
509 my($user) = (shift || "");
510 my($path_atrm) = "/usr/bin/atrm";
515 return "Invalid arguments" if (($user eq "") || ($#jobs == -1));
517 if (!defined($pid = open(ATRM, "-|"))) {
518 die("creating pipe to atrm: $!\n");
519 } elsif ($pid == 0) {
520 exec($path_atrm, $user, @jobs);
523 while(defined($_ = <ATRM>)) {
531 my($user) = (shift || "");
534 return 1 if ($user eq "");
536 @at = invoke_atq($user);
537 return 0 if ($#at == -1);
539 print STDERR "Removing user's at jobs:";
540 print STDERR " @at:";
541 $atrm = invoke_atrm($user, @at);
543 print STDERR " -- $atrm\n";
547 print STDERR " done.\n";
555 while (-l $path && -e $path) {
556 if (!defined($l = readlink($path))) {
557 die "${whoami}: readlink on $path failed (but it should have worked!): $!\n";
564 $path =~ s/\/[^\/]+\/?$/\/$l/; # Replace last component of path
570 sub kill_users_processes {
571 local($login_name, $uid) = @_;
572 local($pid, $result);
575 # Do something a little complex: fork a child that changes its
576 # real and effective UID to that of the removed user, then issues
577 # a "kill(9, -1)" to kill all processes of the same uid as the sender
578 # (see kill(2) for details).
579 # The parent waits for the exit of the child and then returns.
584 } elsif (defined $pid) {
588 if ($< != $uid || $> != $uid) {
589 print STDERR "${whoami}: Error (kill_users_processes):\n" .
590 "\tCouldn't reset uid/euid to ${uid}: current uid/euid's are $< and $>\n";
593 $result = kill(9, -1);
594 print STDERR "Killed process(es) belonging to $login_name.\n"
599 print STDERR "${whoami}: Error: couldn't fork to kill ${login_name}'s processes - continuing\n";