1130b656e5
This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long. Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise.
465 lines
13 KiB
Perl
465 lines
13 KiB
Perl
#!/usr/bin/perl
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# -*- perl -*-
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# Copyright 1995, 1996 Guy Helmer, Madison, South Dakota 57042.
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer as
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# the first lines of this file unmodified.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# 3. The name of the author may not be used to endorse or promote products
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# derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY GUY HELMER ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL GUY HELMER BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# rmuser - Perl script to remove users
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#
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# Guy Helmer <ghelmer@alpha.dsu.edu>, 07/17/96
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#
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# $FreeBSD$
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sub LOCK_SH {0x01;}
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sub LOCK_EX {0x02;}
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sub LOCK_NB {0x04;}
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sub LOCK_UN {0x08;}
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sub F_SETFD {2;}
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$ENV{"PATH"} = "/bin:/sbin:/usr/bin:/usr/sbin";
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umask(022);
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$whoami = $0;
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$passwd_file = "/etc/master.passwd";
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$new_passwd_file = "${passwd_file}.new.$$";
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$group_file = "/etc/group";
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$new_group_file = "${group_file}.new.$$";
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$mail_dir = "/var/mail";
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$crontab_dir = "/var/cron/tabs";
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$atjob_dir = "/var/at/jobs";
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#$debug = 1;
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sub cleanup {
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local($sig) = @_;
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print STDERR "Caught signal SIG$sig -- cleaning up.\n";
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&unlockpw;
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if (-e $new_passwd_file) {
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unlink $new_passwd_file;
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}
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exit(0);
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}
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sub lockpw {
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# Open the password file for reading
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if (!open(MASTER_PW, "$passwd_file")) {
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print STDERR "${whoami}: Error: Couldn't open ${passwd_file}: $!\n";
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exit(1);
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}
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# Set the close-on-exec flag just in case
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fcntl(MASTER_PW, &F_SETFD, 1);
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# Apply an advisory lock the password file
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if (!flock(MASTER_PW, &LOCK_EX|&LOCK_NB)) {
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print STDERR "Couldn't lock ${passwd_file}: $!\n";
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exit(1);
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}
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}
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sub unlockpw {
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flock(MASTER_PW, &LOCK_UN);
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}
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$SIG{'INT'} = 'cleanup';
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$SIG{'QUIT'} = 'cleanup';
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$SIG{'HUP'} = 'cleanup';
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$SIG{'TERM'} = 'cleanup';
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if ($#ARGV > 0) {
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print STDERR "usage: ${whoami} [username]\n";
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exit(1);
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}
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if ($< != 0) {
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print STDERR "${whoami}: Error: you must be root to use ${whoami}\n";
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exit(1);
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}
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&lockpw;
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if ($#ARGV == 0) {
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# Username was given as a parameter
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$login_name = pop(@ARGV);
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die "Sorry, login name must contain alphanumeric characters only.\n"
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if ($login_name !~ /^[a-z0-9_][a-z0-9_\-]*$/);
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} else {
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# Get the user name from the user
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$login_name = &get_login_name;
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}
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if (($pw_ent = &check_login_name($login_name)) eq '0') {
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print STDERR "${whoami}: Error: User ${login_name} not in password database\n";
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&unlockpw;
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exit 1;
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}
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($name, $password, $uid, $gid, $class, $change, $expire, $gecos, $home_dir,
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$shell) = split(/:/, $pw_ent);
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if ($uid == 0) {
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print "${whoami}: Sorry, I'd rather not remove a user with a uid of 0.\n";
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&unlockpw;
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exit 1;
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}
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print "Matching password entry:\n\n$pw_ent\n\n";
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$ans = &get_yn("Is this the entry you wish to remove? ");
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if ($ans eq 'N') {
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print "User ${login_name} not removed.\n";
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&unlockpw;
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exit 0;
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}
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#
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# Get owner of user's home directory; don't remove home dir if not
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# owned by $login_name
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$remove_directory = 1;
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if (-l $home_dir) {
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$real_home_dir = &resolvelink($home_dir);
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} else {
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$real_home_dir = $home_dir;
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}
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#
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# If home_dir is a symlink and points to something that isn't a directory,
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# or if home_dir is not a symlink and is not a directory, don't remove
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# home_dir -- seems like a good thing to do, but probably isn't necessary...
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if (((-l $home_dir) && ((-e $real_home_dir) && !(-d $real_home_dir))) ||
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(!(-l $home_dir) && !(-d $home_dir))) {
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print STDERR "${whoami}: Home ${home_dir} is not a directory, so it won't be removed\n";
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$remove_directory = 0;
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}
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if (length($real_home_dir) && -d $real_home_dir) {
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$dir_owner = (stat($real_home_dir))[4]; # UID
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if ($dir_owner != $uid) {
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print STDERR "${whoami}: Home dir ${real_home_dir} is not owned by ${login_name} (uid ${dir_owner})\n";
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$remove_directory = 0;
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}
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}
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if ($remove_directory) {
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$ans = &get_yn("Remove user's home directory ($home_dir)? ");
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if ($ans eq 'N') {
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$remove_directory = 0;
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}
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}
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#exit 0 if $debug;
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#
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# Remove the user's crontab, if there is one
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# (probably needs to be done before password databases are updated)
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if (-e "$crontab_dir/$login_name") {
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print STDERR "Removing user's crontab:";
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system('/usr/bin/crontab', '-u', $login_name, '-r');
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print STDERR " done.\n";
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}
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#
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# Remove the user's at jobs, if any
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# (probably also needs to be done before password databases are updated)
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&remove_at_jobs($login_name, $uid);
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#
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# Copy master password file to new file less removed user's entry
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&update_passwd_file;
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#
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# Remove the user from all groups in /etc/group
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&update_group_file($login_name);
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#
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# Remove the user's home directory
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if ($remove_directory) {
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print STDERR "Removing user's home directory ($home_dir):";
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&remove_dir($home_dir);
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print STDERR " done.\n";
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}
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#
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# Remove the user's incoming mail file
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if (-e "$mail_dir/$login_name" || -l "$mail_dir/$login_name") {
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print STDERR "Removing user's incoming mail file ($mail_dir/$login_name):";
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unlink "$mail_dir/$login_name" ||
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print STDERR "\n${whoami}: warning: unlink on $mail_dir/$login_name failed ($!) - continuing\n";
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print STDERR " done.\n";
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}
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#
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# All done!
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exit 0;
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sub get_login_name {
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#
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# Get new user's name
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local($done, $login_name);
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for ($done = 0; ! $done; ) {
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print "Enter login name for user to remove: ";
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$login_name = <>;
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chop $login_name;
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if (!($login_name =~ /^[a-z0-9_][a-z0-9_\-]*$/)) {
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print STDERR "Sorry, login name must contain alphanumeric characters only.\n";
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} elsif (length($login_name) > 16 || length($login_name) == 0) {
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print STDERR "Sorry, login name must be 16 characters or less.\n";
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} else {
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$done = 1;
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}
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}
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print "User name is ${login_name}\n" if $debug;
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return($login_name);
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}
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sub check_login_name {
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#
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# Check to see whether login name is in password file
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local($login_name) = @_;
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local($Mname, $Mpassword, $Muid, $Mgid, $Mclass, $Mchange, $Mexpire,
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$Mgecos, $Mhome_dir, $Mshell);
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local($i);
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seek(MASTER_PW, 0, 0);
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while ($i = <MASTER_PW>) {
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chop $i;
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($Mname, $Mpassword, $Muid, $Mgid, $Mclass, $Mchange, $Mexpire,
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$Mgecos, $Mhome_dir, $Mshell) = split(/:/, $i);
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if ($Mname eq $login_name) {
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seek(MASTER_PW, 0, 0);
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return($i); # User is in password database
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}
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}
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seek(MASTER_PW, 0, 0);
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return '0'; # User wasn't found
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}
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sub get_yn {
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#
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# Get a yes or no answer; return 'Y' or 'N'
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local($prompt) = @_;
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local($done, $ans);
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for ($done = 0; ! $done; ) {
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print $prompt;
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$ans = <>;
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chop $ans;
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$ans =~ tr/a-z/A-Z/;
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if (!($ans =~ /^[YN]/)) {
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print STDERR "Please answer (y)es or (n)o.\n";
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} else {
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$done = 1;
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}
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}
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return(substr($ans, 0, 1));
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}
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sub update_passwd_file {
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local($skipped, $i);
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print STDERR "Updating password file,";
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seek(MASTER_PW, 0, 0);
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open(NEW_PW, ">$new_passwd_file") ||
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die "\n${whoami}: Error: Couldn't open file ${new_passwd_file}:\n $!\n";
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chmod(0600, $new_passwd_file) ||
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print STDERR "\n${whoami}: warning: couldn't set mode of $new_passwd_file to 0600 ($!)\n\tcontinuing, but please check mode of /etc/master.passwd!\n";
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$skipped = 0;
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while ($i = <MASTER_PW>) {
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if ($i =~ /\n$/) {
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chop $i;
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}
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if ($i ne $pw_ent) {
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print NEW_PW "$i\n";
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} else {
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print STDERR "Dropped entry for $login_name\n" if $debug;
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$skipped = 1;
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}
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}
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close(NEW_PW);
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seek(MASTER_PW, 0, 0);
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if ($skipped == 0) {
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print STDERR "\n${whoami}: Whoops! Didn't find ${login_name}'s entry second time around!\n";
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unlink($new_passwd_file) ||
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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";
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&unlockpw;
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exit 1;
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}
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#
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# Run pwd_mkdb to install the updated password files and databases
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print STDERR " updating databases,";
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system('/usr/sbin/pwd_mkdb', '-p', ${new_passwd_file});
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print STDERR " done.\n";
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close(MASTER_PW); # Not useful anymore
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}
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sub update_group_file {
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local($login_name) = @_;
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local($i, $j, $grmember_list, $new_grent);
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local($grname, $grpass, $grgid, $grmember_list, @grmembers);
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print STDERR "Updating group file:";
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open(GROUP, $group_file) ||
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die "\n${whoami}: Error: couldn't open ${group_file}: $!\n";
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if (!flock(GROUP, &LOCK_EX|&LOCK_NB)) {
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print STDERR "\n${whoami}: Error: couldn't lock ${group_file}: $!\n";
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exit 1;
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}
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local($group_perms, $group_uid, $group_gid) =
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(stat(GROUP))[2, 4, 5]; # File Mode, uid, gid
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open(NEW_GROUP, ">$new_group_file") ||
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die "\n${whoami}: Error: couldn't open ${new_group_file}: $!\n";
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chmod($group_perms, $new_group_file) ||
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printf STDERR "\n${whoami}: warning: could not set permissions of new group file to %o ($!)\n\tContinuing, but please check permissions of $group_file!\n", $group_perms;
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chown($group_uid, $group_gid, $new_group_file) ||
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print STDERR "\n${whoami}: warning: could not set owner/group of new group file to ${group_uid}/${group_gid} ($!)\n\rContinuing, but please check ownership of $group_file!\n";
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while ($i = <GROUP>) {
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if (!($i =~ /$login_name/)) {
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# Line doesn't contain any references to the user, so just add it
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# to the new file
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print NEW_GROUP $i;
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} else {
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#
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# Remove the user from the group
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if ($i =~ /\n$/) {
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chop $i;
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}
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($grname, $grpass, $grgid, $grmember_list) = split(/:/, $i);
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@grmembers = split(/,/, $grmember_list);
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undef @new_grmembers;
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local(@new_grmembers);
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foreach $j (@grmembers) {
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if ($j ne $login_name) {
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push(new_grmembers, $j);
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} elsif ($debug) {
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print STDERR "Removing $login_name from group $grname\n";
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}
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}
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if ($grname eq $login_name && $#new_grmembers == -1) {
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# Remove a user's personal group if empty
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print STDERR "Removing group $grname -- personal group is empty\n";
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} else {
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$grmember_list = join(',', @new_grmembers);
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$new_grent = join(':', $grname, $grpass, $grgid, $grmember_list);
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print NEW_GROUP "$new_grent\n";
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}
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}
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}
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close(NEW_GROUP);
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rename($new_group_file, $group_file) || # Replace old group file with new
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die "\n${whoami}: error: couldn't rename $new_group_file to $group_file ($!)\n";
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close(GROUP); # File handle is worthless now
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print STDERR " done.\n";
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}
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sub remove_dir {
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# Remove the user's home directory
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local($dir) = @_;
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local($linkdir);
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if (-l $dir) {
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$linkdir = &resolvelink($dir);
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# Remove the symbolic link
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unlink($dir) ||
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warn "${whoami}: Warning: could not unlink symlink $dir: $!\n";
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if (!(-e $linkdir)) {
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#
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# Dangling symlink - just return now
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return;
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}
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# Set dir to be the resolved pathname
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$dir = $linkdir;
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}
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if (!(-d $dir)) {
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print STDERR "${whoami}: Warning: $dir is not a directory\n";
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unlink($dir) || warn "${whoami}: Warning: could not unlink $dir: $!\n";
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return;
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}
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system('/bin/rm', '-rf', $dir);
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}
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sub remove_at_jobs {
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local($login_name, $uid) = @_;
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local($i, $owner, $found);
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$found = 0;
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opendir(ATDIR, $atjob_dir) || return;
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while ($i = readdir(ATDIR)) {
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next if $i eq '.';
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next if $i eq '..';
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next if $i eq '.lockfile';
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$owner = (stat("$atjob_dir/$i"))[4]; # UID
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if ($uid == $owner) {
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if (!$found) {
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print STDERR "Removing user's at jobs:";
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$found = 1;
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}
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# Use atrm to remove the job
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print STDERR " $i";
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system('/usr/bin/atrm', $i);
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}
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}
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closedir(ATDIR);
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if ($found) {
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print STDERR " done.\n";
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}
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}
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sub resolvelink {
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local($path) = @_;
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local($l);
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while (-l $path && -e $path) {
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if (!defined($l = readlink($path))) {
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die "${whoami}: readlink on $path failed (but it should have worked!): $!\n";
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}
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if ($l =~ /^\//) {
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# Absolute link
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$path = $l;
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} else {
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# Relative link
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$path =~ s/\/[^\/]+\/?$/\/$l/; # Replace last component of path
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}
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}
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return $path;
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}
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