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📄 pam_login.cgi(2.65 KB)
📄 password_change.cgi(7 KB)
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📄 webmin_search.cgi(2.63 KB)

Editing: password_change.cgi

#!/usr/bin/perl
# password_change.cgi
# Actually update a user's password by directly modifying /etc/shadow

BEGIN { push(@INC, "."); };
use WebminCore;

$ENV{'MINISERV_INTERNAL'} || die "Can only be called by miniserv.pl";
&init_config();
&ReadParse();
&get_miniserv_config(\%miniserv);
$miniserv{'passwd_mode'} == 2 || die "Password changing is not enabled!";

# Validate inputs
$in{'new1'} ne '' || &pass_error($text{'password_enew1'});
$in{'new1'} eq $in{'new2'} || &pass_error($text{'password_enew2'});

# Is this a Webmin user?
if (&foreign_check("acl")) {
	&foreign_require("acl", "acl-lib.pl");
	($wuser) = grep { $_->{'name'} eq $in{'user'} } &acl::list_users();
	if ($wuser) {
		if ($wuser->{'pass'} eq 'x') {
			# A Webmin user, but using Unix authentication
			$wuser = undef;
			}
		elsif ($wuser->{'pass'} eq '*LK*' ||
		       $wuser->{'pass'} =~ /^\!/) {
			&pass_error("Webmin users with locked accounts cannot change ".
				    "their passwords!");
			}
		}
	}
if (!$in{'pam'} && !$wuser) {
	$miniserv{'passwd_cindex'} ne '' && $miniserv{'passwd_mindex'} ne '' || 
		die "Missing password file configuration";
	}

if ($wuser) {
	# Update Webmin user's password
	$ok = &acl::validate_password($in{'old'}, $wuser->{'pass'});
	$ok || &pass_error($text{'password_eold'});
	$perr = &acl::check_password_restrictions($in{'user'}, $in{'new1'});
	$perr && &pass_error(&text('password_enewpass', $perr));
	$wuser->{'pass'} = &acl::encrypt_password($in{'new1'});
	$wuser->{'temppass'} = 0;
	&acl::modify_user($wuser->{'name'}, $wuser);
	&reload_miniserv();
	}
elsif ($gconfig{'passwd_cmd'}) {
	# Use some configured command
	$passwd_cmd = &has_command($gconfig{'passwd_cmd'});
	$passwd_cmd || &pass_error("The password change command <tt>$gconfig{'passwd_cmd'}</tt> was not found");

&foreign_require("proc", "proc-lib.pl");
	&clean_environment();
	$ENV{'REMOTE_USER'} = $in{'user'};	# some programs need this
	$passwd_cmd .= " ".quotemeta($in{'user'});
	($fh, $fpid) = &proc::pty_process_exec($passwd_cmd, 0, 0);
	&reset_environment();
	while(1) {
		local $rv = &wait_for($fh,
			   '(new|re-enter).*:',
			   '(old|current|login).*:',
			   'pick a password',
			   'too\s+many\s+failures',
			   'attributes\s+changed\s+on|successfully\s+changed',
			   'pick your passwords');
		$out .= $wait_for_input;
		sleep(1);
		if ($rv == 0) {
			# Prompt for the new password
			syswrite($fh, $in{'new1'}."\n", length($in{'new1'})+1);
			}
		elsif ($rv == 1) {
			# Prompt for the old password
			syswrite($fh, $in{'old'}."\n", length($in{'old'})+1);
			}
		elsif ($rv == 2) {
			# Request for a menu option (SCO?)
			syswrite($fh, "1\n", 2);
			}
		elsif ($rv == 3) {
			# Failed too many times
			last;
			}
		elsif ($rv == 4) {
			# All done
			last;
			}
		elsif ($rv == 5) {
			# Request for a menu option (HP/UX)
			syswrite($fh, "p\n", 2);
			}
		else {
			last;
			}
		last if (++$count > 10);
		}
	$crv = close($fh);
	sleep(1);
	waitpid($fpid, 1);
	if ($? || $count > 10 ||
	    $out =~ /error|failed/i || $out =~ /bad\s+password/i) {
		&pass_error("<tt>".&html_escape($out)."</tt>");
		}
	}
elsif ($in{'pam'}) {
	# Use PAM to make the change..
	eval "use Authen::PAM;";
	if ($@) {
		&pass_error(&text('password_emodpam', $@));
		}

# Check if the old password is correct
	$service = $miniserv{'pam'} ? $miniserv{'pam'} : "webmin";
	$pamh = new Authen::PAM($service, $in{'user'}, \&pam_check_func);
	$rv = $pamh->pam_authenticate();
	$rv == PAM_SUCCESS() ||
		&pass_error($text{'password_eold'});
	$pamh = undef;

# Change the password with PAM, in a sub-process. This is needed because
	# the UID must be changed to properly signal to the PAM libraries that
	# the password change is not being done by the root user.
	$temp = &transname();
	$pid = fork();
	@uinfo = getpwnam($in{'user'});
	if (!$pid) {
		($>, $<) = (0, $uinfo[2]);
		$pamh = new Authen::PAM("passwd", $in{'user'}, \&pam_change_func);
		$rv = $pamh->pam_chauthtok();
		open(TEMP, ">$temp");
		print TEMP "$rv\n";
		print TEMP ($messages || $pamh->pam_strerror($rv)),"\n";
		close(TEMP);
		exit(0);
		}
	waitpid($pid, 0);
	open(TEMP, "<$temp");
	chop($rv = <TEMP>);
	chop($messages = <TEMP>);
	close(TEMP);
	unlink($temp);
	$rv == PAM_SUCCESS || &pass_error(&text('password_epam', $messages));
	$pamh = undef;
	}
else {
	# Directly update password file

# Read shadow file and find user
	&lock_file($miniserv{'passwd_file'});
	$lref = &read_file_lines($miniserv{'passwd_file'});
	for($i=0; $i<@$lref; $i++) {
		@line = split(/:/, $lref->[$i], -1);
		local $u = $line[$miniserv{'passwd_uindex'}];
		if ($u eq $in{'user'}) {
			$idx = $i;
			last;
			}
		}
	defined($idx) || &pass_error($text{'password_euser'});

# Validate old password
	&unix_crypt($in{'old'}, $line[$miniserv{'passwd_pindex'}]) eq
		$line[$miniserv{'passwd_pindex'}] ||
			&pass_error($text{'password_eold'});

# Make sure new password meets restrictions
	if (&foreign_check("changepass")) {
		&foreign_require("changepass", "changepass-lib.pl");
		$err = &changepass::check_password($in{'new1'}, $in{'user'});
		&pass_error($err) if ($err);
		}
	elsif (&foreign_check("useradmin")) {
		&foreign_require("useradmin", "user-lib.pl");
		$err = &useradmin::check_password_restrictions(
				$in{'new1'}, $in{'user'});
		&pass_error($err) if ($err);
		}

# Set new password and save file
	$salt = chr(int(rand(26))+65) . chr(int(rand(26))+65);
	$line[$miniserv{'passwd_pindex'}] = &unix_crypt($in{'new1'}, $salt);
	$days = int(time()/(24*60*60));
	$line[$miniserv{'passwd_cindex'}] = $days;
	$lref->[$idx] = join(":", @line);
	&flush_file_lines();
	&unlock_file($miniserv{'passwd_file'});
	}

# Change password in Usermin too
if (&get_product_name() eq 'usermin' &&
    &foreign_check("changepass")) {
	&foreign_require("changepass", "changepass-lib.pl");
	&changepass::change_mailbox_passwords(
		$in{'user'}, $in{'old'}, $in{'new1'});
	&changepass::change_samba_password(
		$in{'user'}, $in{'old'}, $in{'new1'});
	}

# Show ok page
&header(undef, undef, undef, undef, 1, 1);
print &ui_alert_box(&text('password_done', "/"), "success");
&footer();

sub pass_error
{
&header(undef, undef, undef, undef, 1, 1, undef, undef);
print &ui_alert_box("$text{'password_err'}: @_.", "danger");
&footer();
exit;
}

sub pam_check_func
{
my @res;
while ( @_ ) {
	my $code = shift;
	my $msg = shift;
	my $ans = "";

$ans = $in{'user'} if ($code == PAM_PROMPT_ECHO_ON());
	$ans = $in{'old'} if ($code == PAM_PROMPT_ECHO_OFF());

push @res, PAM_SUCCESS();
	push @res, $ans;
	}
push @res, PAM_SUCCESS();
return @res;
}

sub pam_change_func
{
my @res;
while ( @_ ) {
	my $code = shift;
	my $msg = shift;
	my $ans = "";
	$messages = $msg;

if ($code == PAM_PROMPT_ECHO_ON()) {
		# Assume asking for username
		push @res, PAM_SUCCESS();
		push @res, $in{'user'};
		}
	elsif ($code == PAM_PROMPT_ECHO_OFF()) {
		# Assume asking for a password (old first, then new)
		push @res, PAM_SUCCESS();
		if ($msg =~ /old|current|login/i) {
			push @res, $in{'old'};
			}
		else {
			push @res, $in{'new1'};
			}
		}
	else {
		# Some message .. ignore it
		push @res, PAM_SUCCESS();
		push @res, undef;
		}
	}
push @res, PAM_SUCCESS();
return @res;
}

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Editing: password_change.cgi

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