This file is indexed.

/usr/share/perl5/Authen/Simple/Passwd.pm is in libauthen-simple-passwd-perl 0.6-4.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
package Authen::Simple::Passwd;

use strict;
use warnings;
use bytes;
use base 'Authen::Simple::Adapter';

use Carp             qw[];
use Config           qw[];
use Fcntl            qw[LOCK_SH];
use IO::File         qw[O_RDONLY];
use Params::Validate qw[];

our $VERSION = 0.6;

__PACKAGE__->options({
    path => {
        type      => Params::Validate::SCALAR,
        optional  => 1
    },
    flock => {
        type      => Params::Validate::SCALAR,
        default   => ( $Config::Config{d_flock} ) ? 1 : 0,
        optional  => 1
    },
    passwd => {  # deprecated
        type      => Params::Validate::SCALAR,
        optional  => 1
    },
    allow => {   # deprecated
        type      => Params::Validate::ARRAYREF,
        optional  => 1,
    }
});

sub init {
    my ( $self, $params ) = @_;

    my $path = $params->{path} ||= delete $params->{passwd};

    unless ( -e $path ) {
        Carp::croak( qq/Passwd path '$path' does not exist./ );
    }

    unless ( -f _ ) {
        Carp::croak( qq/Passwd path '$path' is not a file./ );
    }

    unless ( -r _ ) {
        Carp::croak( qq/Passwd path '$path' is not readable by effective uid '$>'./ );
    }

    return $self->SUPER::init($params);
}

sub check {
    my ( $self, $username, $password ) = @_;

    if ( $username =~ /^-/ ) {

        $self->log->debug( qq/User '$username' begins with a hyphen which is not allowed./ )
          if $self->log;

        return 0;
    }

    my ( $path, $fh, $encrypted ) = ( $self->path, undef, undef );

    unless ( $fh = IO::File->new( $path, O_RDONLY ) ) {

        $self->log->error( qq/Failed to open passwd '$path'. Reason: '$!'/ )
          if $self->log;

        return 0;
    }

    unless ( !$self->flock || flock( $fh, LOCK_SH ) ) {

        $self->log->error( qq/Failed to obtain a shared lock on passwd '$path'. Reason: '$!'/ )
          if $self->log;

        return 0;
    }

    while ( defined( $_ = $fh->getline ) ) {

        next if /^#/;
        next if /^\s+/;

        chop;

        my (@credentials) = split( /:/, $_, 3 );

        if ( $credentials[0] eq $username ) {

            $encrypted = $credentials[1];

            $self->log->debug( qq/Found user '$username' in passwd '$path'./ )
              if $self->log;

            last;
        }
    }

    unless ( $fh->close ) {

        $self->log->warn( qq/Failed to close passwd '$path'. Reason: '$!'/ )
          if $self->log;
    }

    unless ( defined $encrypted ) {

        $self->log->debug( qq/User '$username' was not found in passwd '$path'./ )
          if $self->log;

        return 0;
    }

    unless ( length $encrypted ) {

        $self->log->debug( qq/Encrypted password for user '$username' is null./ )
          if $self->log;

        return 0;
    }

    unless ( $self->check_password( $password, $encrypted ) ) {

        $self->log->debug( qq/Failed to authenticate user '$username'. Reason: 'Invalid credentials'/ )
          if $self->log;

        return 0;
    }

    $self->log->debug( qq/Successfully authenticated user '$username'./ )
      if $self->log;

    return 1;
}

1;

__END__

=head1 NAME

Authen::Simple::Passwd - Simple Passwd authentication

=head1 SYNOPSIS

    use Authen::Simple::Passwd;
    
    my $passwd = Authen::Simple::Passwd->new( 
        path => '/etc/passwd'
    );
    
    if ( $passwd->authenticate( $username, $password ) ) {
        # successfull authentication
    }
    
    # or as a mod_perl Authen handler
    
    PerlModule Authen::Simple::Apache
    PerlModule Authen::Simple::Passwd

    PerlSetVar AuthenSimplePasswd_path "/etc/passwd"

    <Location /protected>
      PerlAuthenHandler Authen::Simple::Passwd
      AuthType          Basic
      AuthName          "Protected Area"
      Require           valid-user
    </Location>    

=head1 DESCRIPTION

Authenticate against a passwd file.

=head1 METHODS

=over 4

=item * new

This method takes a hash of parameters. The following options are valid:

=over 8

=item * path

Path to passwd file to authenticate against. Any standard passwd file that 
has records separated with newline and fields separated by C<:> is supported.
First field is expected to be username and second field, plain or encrypted 
password. Required.

    path => '/etc/passwd'
    path => '/var/www/.htpasswd'
    
=item * flock

A boolean to enable or disable the usage of C<flock()>. Defaults to C<d_flock> in L<Config>.

    flock => 0

=item * log

Any object that supports C<debug>, C<info>, C<error> and C<warn>.

    log => Log::Log4perl->get_logger('Authen::Simple::Passwd')

=back

=item * authenticate( $username, $password )

Returns true on success and false on failure. Authentication attempts with a username that begins with a 
hyphen C<-> will always return false.

=back

=head1 SEE ALSO

L<Authen::Simple>.

L<Authen::Simple::Password>.

L<passwd(5)>.

=head1 AUTHOR

Christian Hansen C<ch@ngmedia.com>

=head1 COPYRIGHT

This program is free software, you can redistribute it and/or modify 
it under the same terms as Perl itself.

=cut