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12aa0bc6 MG |
1 | package Plack::Middleware::Auth::Complex; |
2 | ||
3 | use 5.014000; | |
4 | use strict; | |
5 | use warnings; | |
6 | ||
de80d316 | 7 | our $VERSION = '0.002'; |
12aa0bc6 MG |
8 | |
9 | use parent qw/Plack::Middleware/; | |
1f7bfc27 | 10 | use re '/s'; |
12aa0bc6 MG |
11 | |
12 | use Authen::Passphrase; | |
13 | use Authen::Passphrase::BlowfishCrypt; | |
61456017 MG |
14 | use Data::Entropy qw/entropy_source/; |
15 | use Data::Entropy::Source; | |
16 | use Data::Entropy::RawSource::Local; | |
17 | use Carp qw/carp croak/; | |
12aa0bc6 | 18 | use DBI; |
4c1b8033 | 19 | use Digest::SHA qw/hmac_sha1_base64 sha256/; |
12aa0bc6 MG |
20 | use Email::Simple; |
21 | use Email::Sender::Simple qw/sendmail/; | |
22 | use MIME::Base64 qw/decode_base64/; | |
23 | use Plack::Request; | |
4c1b8033 | 24 | use Tie::Hash::Expire; |
12aa0bc6 | 25 | |
61456017 MG |
26 | sub make_entropy_source { |
27 | if (-e '/dev/urandom') { | |
28 | Data::Entropy::Source->new( | |
29 | Data::Entropy::RawSource::Local->new('/dev/urandom'), | |
30 | 'sysread' | |
31 | ) | |
32 | } else { | |
33 | carp "/dev/urandom not found, using insecure random source\n"; | |
34 | entropy_source | |
35 | } | |
36 | } | |
37 | ||
12aa0bc6 MG |
38 | sub default_opts {( |
39 | dbi_connect => ['dbi:Pg:', '', ''], | |
40 | select_user => 'SELECT passphrase, email FROM users WHERE id = ?', | |
41 | update_pass => 'UPDATE users SET passphrase = ? WHERE id = ?', | |
42 | insert_user => 'INSERT INTO users (id, passphrase, email) VALUES (?,?,?)', | |
43 | mail_subject => 'Password reset token', | |
44 | realm => 'restricted area', | |
4c1b8033 MG |
45 | cache_fail => 0, |
46 | cache_max_age => 5 * 60, | |
fe1dfcf1 | 47 | token_max_age => 60 * 60, |
1f7bfc27 | 48 | username_regex => qr/^\w{2,20}$/as, |
cd19b1b4 | 49 | invalid_username => 'Invalid username', |
388ed281 MG |
50 | register_url => '/action/register', |
51 | passwd_url => '/action/passwd', | |
52 | request_reset_url => '/action/request-reset', | |
53 | reset_url => '/action/reset' | |
12aa0bc6 MG |
54 | )} |
55 | ||
56 | sub new { | |
57 | my ($class, $opts) = @_; | |
58 | my %self = $class->default_opts; | |
59 | %self = (%self, %$opts); | |
61456017 | 60 | $self{entropy_source} //= make_entropy_source; |
12aa0bc6 | 61 | my $self = bless \%self, $class; |
12aa0bc6 MG |
62 | $self |
63 | } | |
64 | ||
65 | sub init { | |
66 | my ($self) = @_; | |
1f7bfc27 | 67 | $self->{dbh} = DBI->connect(@{$self->{dbi_connect}}) or croak $DBI::errstr; |
9d9f4067 | 68 | $self->{post_connect_cb}->($self) if $self->{post_connect_cb}; # uncoverable branch false |
1f7bfc27 MG |
69 | $self->{insert_sth} = $self->{dbh}->prepare($self->{insert_user}) or croak $self->{dbh}->errstr; |
70 | $self->{select_sth} = $self->{dbh}->prepare($self->{select_user}) or croak $self->{dbh}->errstr; | |
71 | $self->{update_sth} = $self->{dbh}->prepare($self->{update_pass}) or croak $self->{dbh}->errstr; | |
12aa0bc6 MG |
72 | } |
73 | ||
8637972b MG |
74 | sub create_user { |
75 | my ($self, $parms) = @_; | |
76 | my %parms = $parms->flatten; | |
6af8d6cc | 77 | $self->{insert_sth}->execute($parms{username}, $self->hash_passphrase($parms{password}), $parms{email}) or croak $self->{insert_sth}->errstr; |
8637972b MG |
78 | } |
79 | ||
12aa0bc6 MG |
80 | sub get_user { |
81 | my ($self, $user) = @_; | |
6af8d6cc | 82 | $self->{select_sth}->execute($user) or croak $self->{select_sth}->errstr; |
12aa0bc6 MG |
83 | $self->{select_sth}->fetchrow_hashref |
84 | } | |
85 | ||
86 | sub check_passphrase { | |
87 | my ($self, $username, $passphrase) = @_; | |
4c1b8033 | 88 | unless ($self->{cache}) { |
1f7bfc27 | 89 | ## no critic (ProhibitTies) |
4c1b8033 MG |
90 | tie my %cache, 'Tie::Hash::Expire', {expire_seconds => $self->{cache_max_age}}; |
91 | $self->{cache} = \%cache; | |
92 | } | |
93 | my $cachekey = sha256 "$username:$passphrase"; | |
9d9f4067 | 94 | return $self->{cache}{$cachekey} if exists $self->{cache}{$cachekey}; # uncoverable branch true |
12aa0bc6 MG |
95 | my $user = $self->get_user($username); |
96 | return 0 unless $user; | |
4c1b8033 MG |
97 | my $ret = Authen::Passphrase->from_rfc2307($user->{passphrase})->match($passphrase); |
98 | $self->{cache}{$cachekey} = $ret if $ret || $self->{cache_fail}; | |
99 | $ret | |
12aa0bc6 MG |
100 | } |
101 | ||
102 | sub hash_passphrase { | |
103 | my ($self, $passphrase) = @_; | |
104 | Authen::Passphrase::BlowfishCrypt->new( | |
105 | cost => 10, | |
106 | passphrase => $passphrase, | |
107 | salt_random => 1, | |
108 | )->as_rfc2307 | |
109 | } | |
110 | ||
111 | sub set_passphrase { | |
112 | my ($self, $username, $passphrase) = @_; | |
6af8d6cc | 113 | $self->{update_sth}->execute($self->hash_passphrase($passphrase), $username) or croak $self->{update_sth}->errstr; |
12aa0bc6 MG |
114 | } |
115 | ||
116 | sub make_reset_hmac { | |
117 | my ($self, $username, @data) = @_; | |
61456017 | 118 | $self->{hmackey} //= $self->{entropy_source}->get_bits(8 * 512); # uncoverable condition false |
12aa0bc6 MG |
119 | my $user = $self->get_user($username); |
120 | my $message = join ' ', $username, $user->{passphrase}, @data; | |
121 | hmac_sha1_base64 $message, $self->{hmackey}; | |
122 | } | |
123 | ||
124 | sub mail_body { | |
125 | my ($self, $username, $token) = @_; | |
126 | my $hours = $self->{token_max_age} / 60 / 60; | |
9d9f4067 | 127 | $hours .= $hours == 1 ? ' hour' : ' hours'; # uncoverable branch false |
1f7bfc27 | 128 | <<"EOF"; |
12aa0bc6 MG |
129 | Someone has requested a password reset for your account. |
130 | ||
131 | To reset your password, please submit the reset password form on the | |
132 | website using the following information: | |
133 | ||
134 | Username: $username | |
135 | Password: <your new password> | |
136 | Reset token: $token | |
137 | ||
138 | The token is valid for $hours. | |
139 | EOF | |
140 | } | |
141 | ||
142 | sub send_reset_email { | |
143 | my ($self, $username) = @_; | |
144 | my $expire = time + $self->{token_max_age}; | |
145 | my $token = $self->make_reset_hmac($username, $expire) . ":$expire"; | |
146 | my $user = $self->get_user($username); | |
147 | sendmail (Email::Simple->create( | |
148 | header => [ | |
149 | From => $self->{mail_from}, | |
150 | To => $user->{email}, | |
876ab8b5 | 151 | Subject => $self->{mail_subject}, |
12aa0bc6 MG |
152 | ], |
153 | body => $self->mail_body($username, $token), | |
154 | )); | |
155 | } | |
156 | ||
157 | ################################################## | |
158 | ||
159 | sub response { | |
160 | my ($self, $code, $body) = @_; | |
161 | return [ | |
162 | $code, | |
163 | ['Content-Type' => 'text/plain', | |
164 | 'Content-Length' => length $body], | |
165 | [ $body ], | |
166 | ]; | |
167 | } | |
168 | ||
169 | sub reply { shift->response(200, $_[0]) } | |
170 | sub bad_request { shift->response(400, $_[0]) } | |
171 | sub internal_server_error { shift->response(500, $_[0]) } | |
172 | ||
173 | sub unauthorized { | |
174 | my ($self) = @_; | |
175 | my $body = 'Authorization required'; | |
176 | return [ | |
177 | 401, | |
178 | ['Content-Type' => 'text/plain', | |
179 | 'Content-Length' => length $body, | |
180 | 'WWW-Authenticate' => 'Basic realm="' . $self->{realm} . '"' ], | |
181 | [ $body ], | |
182 | ]; | |
183 | } | |
184 | ||
185 | ################################################## | |
186 | ||
187 | sub call_register { | |
188 | my ($self, $req) = @_; | |
189 | my %parms; | |
190 | for (qw/username password confirm_password email/) { | |
191 | $parms{$_} = $req->param($_); | |
192 | return $self->bad_request("Missing parameter $_") unless $parms{$_}; | |
193 | } | |
194 | ||
cd19b1b4 | 195 | return $self->bad_request($self->{invalid_username}) unless $parms{username} =~ $self->{username_regex}; |
12aa0bc6 MG |
196 | return $self->bad_request('Username already in use') if $self->get_user($parms{username}); |
197 | return $self->bad_request('The two passwords do not match') unless $parms{password} eq $parms{confirm_password}; | |
8637972b MG |
198 | |
199 | $self->create_user($req->parameters); | |
12aa0bc6 MG |
200 | return $self->reply('Registered successfully') |
201 | } | |
202 | ||
203 | sub call_passwd { | |
204 | my ($self, $req) = @_; | |
205 | return $self->unauthorized unless $req->user; | |
206 | my %parms; | |
207 | for (qw/password new_password confirm_new_password/) { | |
208 | $parms{$_} = $req->param($_); | |
209 | return $self->bad_request("Missing parameter $_") unless $parms{$_}; | |
210 | } | |
211 | ||
212 | return $self->bad_request('Incorrect password') unless $self->check_passphrase($req->user, $parms{password}); | |
213 | return $self->bad_request('The two passwords do not match') unless $parms{new_password} eq $parms{confirm_new_password}; | |
214 | $self->set_passphrase($req->user, $parms{new_password}); | |
215 | return $self->reply('Password changed successfully'); | |
216 | } | |
217 | ||
218 | sub call_request_reset { | |
219 | my ($self, $req) = @_; | |
220 | return $self->internal_server_error('Password resets are disabled') unless $self->{mail_from}; | |
221 | my $username = $req->param('username'); | |
222 | my $user = $self->get_user($username) or return $self->bad_request('No such user'); | |
12aa0bc6 MG |
223 | eval { |
224 | $self->send_reset_email($username); | |
1f7bfc27 MG |
225 | 1 |
226 | } or return $self->internal_server_error($@); | |
227 | $self->reply('Email sent'); | |
12aa0bc6 MG |
228 | } |
229 | ||
230 | sub call_reset { | |
231 | my ($self, $req) = @_; | |
232 | my %parms; | |
233 | for (qw/username new_password confirm_new_password token/) { | |
234 | $parms{$_} = $req->param($_); | |
235 | return $self->bad_request("Missing parameter $_") unless $parms{$_}; | |
236 | } | |
237 | ||
238 | my $user = $self->get_user($parms{username}) or return $self->bad_request('No such user'); | |
239 | return $self->bad_request('The two passwords do not match') unless $parms{new_password} eq $parms{confirm_new_password}; | |
1f7bfc27 | 240 | my ($token, $exp) = split /:/, $parms{token}; |
12aa0bc6 MG |
241 | my $goodtoken = $self->make_reset_hmac($parms{username}, $exp); |
242 | return $self->bad_request('Bad reset token') unless $token eq $goodtoken; | |
243 | return $self->bad_request('Reset token has expired') if time >= $exp; | |
244 | $self->set_passphrase($parms{username}, $parms{new_password}); | |
245 | return $self->reply('Password reset successfully'); | |
246 | } | |
247 | ||
248 | sub call { | |
249 | my ($self, $env) = @_; | |
d332726d MG |
250 | |
251 | unless ($self->{init_done}) { | |
252 | $self->init; | |
253 | $self->{init_done} = 1; | |
254 | } | |
255 | ||
12aa0bc6 MG |
256 | my $auth = $env->{HTTP_AUTHORIZATION}; |
257 | if ($auth && $auth =~ /^Basic (.*)$/i) { | |
258 | my ($user, $pass) = split /:/, decode_base64($1), 2; | |
259 | $env->{REMOTE_USER} = $user if $self->check_passphrase($user, $pass); | |
260 | } | |
261 | ||
262 | my $req = Plack::Request->new($env); | |
263 | ||
264 | if ($req->method eq 'POST') { | |
265 | return $self->call_register($req) if $req->path eq $self->{register_url}; | |
266 | return $self->call_passwd($req) if $req->path eq $self->{passwd_url}; | |
267 | return $self->call_request_reset($req) if $req->path eq $self->{request_reset_url}; | |
268 | return $self->call_reset($req) if $req->path eq $self->{reset_url}; | |
269 | } | |
270 | ||
271 | $env->{authcomplex} = $self; | |
272 | $self->app->($env); | |
273 | } | |
274 | ||
275 | 1; | |
276 | __END__ | |
277 | ||
278 | =head1 NAME | |
279 | ||
280 | Plack::Middleware::Auth::Complex - Feature-rich authentication system | |
281 | ||
282 | =head1 SYNOPSIS | |
283 | ||
284 | use Plack::Builder; | |
285 | ||
286 | builder { | |
287 | enable 'Auth::Complex', dbi_connect => ['dbi:Pg:dbname=mydb', '', ''], mail_from => 'nobody@example.org'; | |
288 | sub { | |
289 | my ($env) = @_; | |
290 | [200, [], ['Hello ' . ($env->{REMOTE_USER} // 'unregistered user')]] | |
291 | } | |
292 | } | |
293 | ||
294 | =head1 DESCRIPTION | |
295 | ||
296 | AuthComplex is an authentication system for Plack applications that | |
297 | allows user registration, password changing and password reset. | |
298 | ||
299 | AuthComplex sets REMOTE_USER if the request includes correct basic | |
300 | authentication and intercepts POST requests to some configurable URLs. | |
a27e5239 | 301 | It also sets C<< $env->{authcomplex} >> to itself before passing the |
12aa0bc6 MG |
302 | request. |
303 | ||
304 | Some options can be controlled by passing a hashref to the | |
305 | constructor. More customization can be achieved by subclassing this | |
306 | module. | |
307 | ||
308 | =head2 Intercepted URLs | |
309 | ||
310 | Only POST requests are intercepted. Parameters can be either query | |
311 | parameters or body parameters. Using query parameters is not | |
312 | recommended. These endpoints return 200 for success, 400 for client | |
313 | error and 500 for server errors. All parameters are mandatory. | |
314 | ||
315 | =over | |
316 | ||
388ed281 | 317 | =item B<POST> /action/register?username=user&password=pw&confirm_password=pw&email=user@example.org |
12aa0bc6 MG |
318 | |
319 | This URL creates a new user with the given username, password and | |
320 | email. The two passwords must match, the user must match | |
321 | C<username_regex> and the user must not already exist. | |
322 | ||
388ed281 | 323 | =item B<POST> /action/passwd?password=oldpw&new_password=newpw&confirm_new_password=newpw |
12aa0bc6 MG |
324 | |
325 | This URL changes the password of a user. The user must be | |
326 | authenticated (otherwise the endpoint will return 401). | |
327 | ||
388ed281 | 328 | =item B<POST> /action/request-reset?username=user |
12aa0bc6 MG |
329 | |
330 | This URL requests a password reset token for the given user. The token | |
331 | will be sent to the user's email address. | |
332 | ||
333 | A reset token in the default implementation is C<< base64(HMAC-SHA1("$username $passphrase $expiration_unix_time")) . ":$expiration_user_time" >>. | |
334 | ||
388ed281 | 335 | =item B<POST> /action/reset?username=user&new_password=pw&confirm_new_password=pw&token=token |
12aa0bc6 MG |
336 | |
337 | This URL performs a password reset. | |
338 | ||
339 | =back | |
340 | ||
341 | =head2 Constructor arguments | |
342 | ||
343 | =over | |
344 | ||
345 | =item dbi_connect | |
346 | ||
347 | Arrayref of arguments to pass to DBI->connect. Defaults to | |
348 | C<['dbi:Pg', '', '']>. | |
349 | ||
61456017 MG |
350 | =item entropy_source |
351 | ||
352 | C<Data::Entropy::Source> object to get random numbers from. By default | |
353 | uses F</dev/urandom> via C<Data::Entropy::RawSource::Local> if | |
354 | possible, or the default entropy source otherwise. A warning is | |
355 | printed if the default entropy source is used, to supress it set this | |
356 | argument to the default entropy source. | |
357 | ||
12aa0bc6 MG |
358 | =item post_connect_cb |
359 | ||
360 | Callback (coderef) that is called just after connecting to the | |
361 | database. Used by the testsuite to create the users table. | |
362 | ||
363 | =item select_user | |
364 | ||
365 | SQL statement that selects a user by username. Defaults to | |
366 | C<'SELECT id, passphrase, email FROM users WHERE id = ?'>. | |
367 | ||
368 | =item update_pass | |
369 | ||
370 | SQL statement that updates a user's password. Defaults to | |
371 | C<'UPDATE users SET passphrase = ? WHERE id = ?'>. | |
372 | ||
373 | =item insert_user | |
374 | ||
375 | SQL statement that inserts a user. Defaults to | |
376 | C<'INSERT INTO users (id, passphrase, email) VALUES (?,?,?)'>. | |
377 | ||
378 | =item hmackey | |
379 | ||
380 | HMAC key used for password reset tokens. If not provided it is | |
381 | generated randomly, in which case reset tokens do not persist across | |
382 | application restarts. | |
383 | ||
384 | =item mail_from | |
385 | ||
386 | From: header of password reset emails. If not provided, password reset | |
387 | is disabled. | |
388 | ||
389 | =item mail_subject | |
390 | ||
391 | The subject of password reset emails. Defaults to | |
392 | C<'Password reset token'>. | |
393 | ||
394 | =item realm | |
395 | ||
396 | Authentication realm. Defaults to C<'restricted area'>. | |
397 | ||
4c1b8033 MG |
398 | =item cache_fail |
399 | ||
400 | If true, all authentication results are cached. If false, only | |
401 | successful logins are cached. Defaults to false. | |
402 | ||
403 | =item cache_max_age | |
404 | ||
405 | Authentication cache timeout, in seconds. Authentication results are | |
406 | cached for this number of seconds to avoid expensive hashing. Defaults | |
407 | to 5 minutes. | |
408 | ||
12aa0bc6 MG |
409 | =item token_max_age |
410 | ||
fe1dfcf1 | 411 | Password reset token validity, in seconds. Defaults to 1 hour. |
12aa0bc6 MG |
412 | |
413 | =item username_regex | |
414 | ||
415 | Regular expression that matches valid usernames. Defaults to | |
1f7bfc27 | 416 | C<qr/^\w{2,20}$/as>. |
12aa0bc6 | 417 | |
cd19b1b4 MG |
418 | =item invalid_username |
419 | ||
420 | Error message returned when the username does not match | |
421 | username_regex. Defaults to C<'Invalid username'> | |
422 | ||
12aa0bc6 MG |
423 | =item register_url |
424 | ||
388ed281 | 425 | URL for registering. Defaults to C<'/action/register'>. |
12aa0bc6 MG |
426 | |
427 | =item passwd_url | |
428 | ||
388ed281 | 429 | URL for changing your password. Defaults to C<'/action/passwd'>. |
12aa0bc6 MG |
430 | |
431 | =item request_reset_url | |
432 | ||
433 | URL for requesting a password reset token by email. Defaults to | |
388ed281 | 434 | C<'/action/request-reset'>. |
12aa0bc6 MG |
435 | |
436 | =item reset_url | |
437 | ||
438 | URL for resetting your password with a reset token. Defaults to | |
388ed281 | 439 | C<'/action/reset'>. |
12aa0bc6 MG |
440 | |
441 | =back | |
442 | ||
443 | =head2 Methods | |
444 | ||
445 | =over | |
446 | ||
447 | =item B<default_opts> | |
448 | ||
449 | Returns a list of default options for the constructor. | |
450 | ||
451 | =item B<new>(I<\%opts>) | |
452 | ||
453 | Creates a new AuthComplex object. | |
454 | ||
455 | =item B<init> | |
456 | ||
d332726d | 457 | Called when the first request is received. The default implementation |
12aa0bc6 MG |
458 | connects to the database, calls C<post_connect_cb> and prepares the |
459 | SQL statements. | |
460 | ||
8637972b MG |
461 | =item B<create_user>(I<$parms>) |
462 | ||
463 | Inserts a new user into the database. I<$parms> is a | |
464 | L<Hash::MultiValue> object containing the request parameters. | |
465 | ||
12aa0bc6 MG |
466 | =item B<get_user>(I<$username>) |
467 | ||
468 | Returns a hashref with (at least) the following keys: passphrase (the | |
469 | RFC2307-formatted passphrase of the user), email (the user's email | |
470 | address). | |
471 | ||
472 | =item B<check_passphrase>(I<$username>, I<$passphrase>) | |
473 | ||
474 | Returns true if the given plaintext passphrase matches the one | |
475 | obtained from database. Default implementation uses L<Authen::Passphrase>. | |
476 | ||
477 | =item B<hash_passphrase>(I<$passphrase>) | |
478 | ||
479 | Returns a RFC2307-formatted hash of the passphrase. Default | |
480 | implementation uses L<Authen::Passphrase::BlowfishCrypt> with a cost | |
481 | of 10 and a random salt. | |
482 | ||
483 | =item B<set_passphrase>(I<$username>, I<$passphrase>) | |
484 | ||
485 | Changes a user's passphrase to the given value. | |
486 | ||
487 | =item B<make_reset_hmac>(I<$username>, [I<@data>]) | |
488 | ||
489 | Returns the HMAC part of the reset token. | |
490 | ||
491 | =item B<mail_body>(I<$username>, I<$token>) | |
492 | ||
493 | Returns the body of the password reset email for the given username | |
494 | and password reset token. | |
495 | ||
496 | =item B<send_reset_email>(I<$username>) | |
497 | ||
498 | Generates a new reset token and sends it to the user via email. | |
499 | ||
500 | =item B<response>(I<$code>, I<$body>) | |
501 | ||
502 | Helper method. Returns a PSGI response with the given response code | |
503 | and string body. | |
504 | ||
505 | =item B<reply>(I<$message>) | |
506 | ||
507 | Shorthand for C<response(200, $message)>. | |
508 | ||
509 | =item B<bad_request>(I<$message>) | |
510 | ||
511 | Shorthand for C<response(400, $message)>. | |
512 | ||
513 | =item B<internal_server_error>(I<$message>) | |
514 | ||
515 | Shorthand for C<response(500, $message)>. | |
516 | ||
517 | =item B<unauthorized> | |
518 | ||
519 | Returns a 401 Authorization required response. | |
520 | ||
521 | =item B<call_register>(I<$req>) | |
522 | ||
f8d502f0 | 523 | Handles the C</action/register> endpoint. I<$req> is a Plack::Request object. |
12aa0bc6 MG |
524 | |
525 | =item B<call_passwd>(I<$req>) | |
526 | ||
f8d502f0 | 527 | Handles the C</action/passwd> endpoint. I<$req> is a Plack::Request object. |
12aa0bc6 MG |
528 | |
529 | =item B<call_request_reset>(I<$req>) | |
530 | ||
f8d502f0 | 531 | Handles the C</action/request-reset> endpoint. I<$req> is a Plack::Request object. |
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532 | |
533 | =item B<call_reset>(I<$req>) | |
534 | ||
f8d502f0 | 535 | Handles the C</action/reset> endpoint. I<$req> is a Plack::Request object. |
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536 | |
537 | =back | |
538 | ||
539 | =head1 AUTHOR | |
540 | ||
541 | Marius Gavrilescu, E<lt>marius@ieval.roE<gt> | |
542 | ||
543 | =head1 COPYRIGHT AND LICENSE | |
544 | ||
cc5b1b68 | 545 | Copyright (C) 2015-2017 by Marius Gavrilescu |
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546 | |
547 | This library is free software; you can redistribute it and/or modify | |
548 | it under the same terms as Perl itself, either Perl version 5.20.1 or, | |
549 | at your option, any later version of Perl 5 you may have available. | |
550 | ||
551 | ||
552 | =cut |