#! /opt/local/bin/perl

# $Id: yppasswd,v 1.9 1999/09/24 19:18:36 jgsmith Exp $
#
# Copyright (c) 1999, Texas A&M University
# 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.
# 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. Neither the name of the University nor the names of its contributors
#    may be used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTERS ``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 THE COPYRIGHT HOLDERS OR CONTRIBUTORS 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.

use lib '../lib';
use lib './yppasswd_private/blib/lib';
use lib './yppasswd_private/blib/arch';

use Data::Dumper;
use yppasswd_private::Data;
use yppasswd_private::Constants;
use RPC::ONC;
use NIS::DBM;
use ErrorHandler;

use vars (qw/$nopw $nogecos $noshell/);

while(@ARGV) {
  my $arg = shift @ARGV;
  if($arg eq '-nopw') {
    $nopw = 1;
  } elsif($arg eq '-nogecos') {
    $nogecos = 1;
  } elsif($arg eq '-noshell') {
    $noshell = 1;
  } elsif($arg eq '-m') {
    @ARGV = ();
  } elsif($arg !~ /^-D/) {
    die "`$arg' is not a valid argument\n";
  }
}

die "yppasswdd does nothing if `-nogecos', `-nopw', and `-noshell' are given\n"
  if($nogecos && $noshell && $nopwd);

sub check_password {
  my($oldpassword, $encpassword) = @_;

  return 1 if crypt($oldpasswd, $oldinfo->{'password'}) 
                eq $oldinfo->{'password'};

  # still need to check against root's password...
  my $rootpw = (getpwnam('root'))[1];
  return 1 if crypt($oldpasswd, $rootpw) eq $rootpw;

  return 0;
}

sub yppasswdproc_update_master_1_eval {
  my($masterpasswd) = shift;
  my($info) = $masterpasswd->newpw;
  my($oldpasswd) = $masterpasswd->oldpass;

  my(%userinfo);

  $userinfo{password} = $info->pw_passwd unless $nopw;
  $userinfo{gecos}    = $info->pw_age    unless $nogecos;
  $userinfo{shell}    = $info->pw_gecos  unless $noshell;

  my %nisinfo;

  my $daemon = tie %nisinfo, 'NIS::DBM', 
    { 'config_file' => '/etc/accounts.conf',
      'sections' => [ 'yppasswd', ],
    };
  if(defined $daemon) {
    my %error_opts;
    foreach my $k ( qw/syslog_ident syslog_facility mail_to/,
                    qw/mail_subject memory_byte_limit mail_on_over_limit/ 
                  )
    {
      if($daemon->get_option($k) !~ /^\s*$/) {
        $error_opts{$k} = $daemon->get_option($k);
      }
    }
    my $error_handler = new ErrorHandler(%error_opts);
    local $SIG{__WARN__} = sub { my $e = join($,,@_); $e =~ s/at\s+\S+\s+line\s+\d+\s*$//; $error_handler->warn($e); };
    local $SIG{__DIE__} = sub { my $e = join($,,@_); $e =~ s/at\s+\S+\s+line\s+\d+\s*$//; $error_handler->error($e); };

    $daemon->set_option(FLUSH => 1);
    $daemon->set_option(CLOBBER => 1);
    $daemon->set_option(PUSH => 1);
    
    my $oldinfo = $nisinfo{$info->pw_name};

    # check passwords at this point...
    unless(check_password($oldpassword, $oldinfo->{'password'})) {
      die "Unauthorized attempt to change passord for $$oldinfo{'username'}";
      return 1;
    }

    foreach my $k (keys %userinfo) {
      $oldinfo->{$k} = $userinfo{$k};
    }
    $nisinfo{$info->pw_name} = $oldinfo;
    return 0;
  } 
  return 1;
}

sub yppasswdproc_update_master_1 {
  my($masterpasswd) = shift;

  my $ret;
  if(defined eval('$ret = yppasswdproc_update_master_1_eval($masterpasswd)')) {
    return $ret;
  }
  return 1;
}

1;