summaryrefslogtreecommitdiffstats
path: root/Bugzilla/CGI.pm
blob: cb09c00667cf10d078ea59f8a91dd19c42b2c686 (plain)
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
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
#
# This Source Code Form is "Incompatible With Secondary Licenses", as
# defined by the Mozilla Public License, v. 2.0.

package Bugzilla::CGI;
use strict;
use base qw(CGI);

use Bugzilla::Constants;
use Bugzilla::Error;
use Bugzilla::Util;
use Bugzilla::Search::Recent;

use File::Basename;

BEGIN {
    if (ON_WINDOWS) {
        # Help CGI find the correct temp directory as the default list
        # isn't Windows friendly (Bug 248988)
        $ENV{'TMPDIR'} = $ENV{'TEMP'} || $ENV{'TMP'} || "$ENV{'WINDIR'}\\TEMP";
    }
    *AUTOLOAD = \&CGI::AUTOLOAD;
}

sub _init_bz_cgi_globals {
    my $invocant = shift;
    # We need to disable output buffering - see bug 179174
    $| = 1;

    # Ignore SIGTERM and SIGPIPE - this prevents DB corruption. If the user closes
    # their browser window while a script is running, the web server sends these
    # signals, and we don't want to die half way through a write.
    $SIG{TERM} = 'IGNORE';
    $SIG{PIPE} = 'IGNORE';

    # We don't precompile any functions here, that's done specially in
    # mod_perl code.
    $invocant->_setup_symbols(qw(:no_xhtml :oldstyle_urls :private_tempfiles
                                 :unique_headers));
}

BEGIN { __PACKAGE__->_init_bz_cgi_globals() if i_am_cgi(); }

sub new {
    my ($invocant, @args) = @_;
    my $class = ref($invocant) || $invocant;

    # Under mod_perl, CGI's global variables get reset on each request,
    # so we need to set them up again every time.
    $class->_init_bz_cgi_globals() if $ENV{MOD_PERL};

    my $self = $class->SUPER::new(@args);

    # Make sure our outgoing cookie list is empty on each invocation
    $self->{Bugzilla_cookie_list} = [];

    # Path-Info is of no use for Bugzilla and interacts badly with IIS.
    # Moreover, it causes unexpected behaviors, such as totally breaking
    # the rendering of pages. Skip it!
    print $self->redirect($self->url(-path => 0, -query => 1)) if $self->path_info;

    # Send appropriate charset
    $self->charset(Bugzilla->params->{'utf8'} ? 'UTF-8' : '');

    # Redirect to urlbase/sslbase if we are not viewing an attachment.
    my $script = basename($0);
    if ($self->url_is_attachment_base and $script ne 'attachment.cgi') {
        $self->redirect_to_urlbase();
    }

    # Check for errors
    # All of the Bugzilla code wants to do this, so do it here instead of
    # in each script

    my $err = $self->cgi_error;

    if ($err) {
        # Note that this error block is only triggered by CGI.pm for malformed
        # multipart requests, and so should never happen unless there is a
        # browser bug.

        print $self->header(-status => $err);

        # ThrowCodeError wants to print the header, so it grabs Bugzilla->cgi
        # which creates a new Bugzilla::CGI object, which fails again, which
        # ends up here, and calls ThrowCodeError, and then recurses forever.
        # So don't use it.
        # In fact, we can't use templates at all, because we need a CGI object
        # to determine the template lang as well as the current url (from the
        # template)
        # Since this is an internal error which indicates a severe browser bug,
        # just die.
        die "CGI parsing error: $err";
    }

    return $self;
}

# We want this sorted plus the ability to exclude certain params
sub canonicalise_query {
    my ($self, @exclude) = @_;

    # Reconstruct the URL by concatenating the sorted param=value pairs
    my @parameters;
    foreach my $key (sort($self->param())) {
        # Leave this key out if it's in the exclude list
        next if grep { $_ eq $key } @exclude;

        # Remove the Boolean Charts for standard query.cgi fields
        # They are listed in the query URL already
        next if $key =~ /^(field|type|value)(-\d+){3}$/;

        my $esc_key = url_quote($key);

        foreach my $value ($self->param($key)) {
            if (defined($value)) {
                my $esc_value = url_quote($value);

                push(@parameters, "$esc_key=$esc_value");
            }
        }
    }

    return join("&", @parameters);
}

sub clean_search_url {
    my $self = shift;
    # Delete any empty URL parameter.
    my @cgi_params = $self->param;

    foreach my $param (@cgi_params) {
        if (defined $self->param($param) && $self->param($param) eq '') {
            $self->delete($param);
            $self->delete("${param}_type");
        }

        # Custom Search stuff is empty if it's "noop". We also keep around
        # the old Boolean Chart syntax for backwards-compatibility.
        if (($param =~ /\d-\d-\d/ || $param =~ /^[[:alpha:]]\d+$/)
            && defined $self->param($param) && $self->param($param) eq 'noop')
        {
            $self->delete($param);
        }
        
        # Any "join" for custom search that's an AND can be removed, because
        # that's the default.
        if (($param =~ /^j\d+$/ || $param eq 'j_top')
            && $self->param($param) eq 'AND')
        {
            $self->delete($param);
        }
    }

    # Delete leftovers from the login form
    $self->delete('Bugzilla_remember', 'GoAheadAndLogIn');

    foreach my $num (1,2,3) {
        # If there's no value in the email field, delete the related fields.
        if (!$self->param("email$num")) {
            foreach my $field (qw(type assigned_to reporter qa_contact cc longdesc)) {
                $self->delete("email$field$num");
            }
        }
    }

    # chfieldto is set to "Now" by default in query.cgi. But if none
    # of the other chfield parameters are set, it's meaningless.
    if (!defined $self->param('chfieldfrom') && !$self->param('chfield')
        && !defined $self->param('chfieldvalue') && $self->param('chfieldto')
        && lc($self->param('chfieldto')) eq 'now')
    {
        $self->delete('chfieldto');
    }

    # cmdtype "doit" is the default from query.cgi, but it's only meaningful
    # if there's a remtype parameter.
    if (defined $self->param('cmdtype') && $self->param('cmdtype') eq 'doit'
        && !defined $self->param('remtype'))
    {
        $self->delete('cmdtype');
    }

    # "Reuse same sort as last time" is actually the default, so we don't
    # need it in the URL.
    if ($self->param('order') 
        && $self->param('order') eq 'Reuse same sort as last time')
    {
        $self->delete('order');
    }

    # list_id is added in buglist.cgi after calling clean_search_url,
    # and doesn't need to be saved in saved searches.
    $self->delete('list_id');

    # no_redirect is used internally by redirect_search_url().
    $self->delete('no_redirect');

    # And now finally, if query_format is our only parameter, that
    # really means we have no parameters, so we should delete query_format.
    if ($self->param('query_format') && scalar($self->param()) == 1) {
        $self->delete('query_format');
    }
}

sub check_etag {
    my ($self, $valid_etag) = @_;

    # ETag support.
    my $if_none_match = $self->http('If-None-Match');
    return if !$if_none_match;

    my @if_none = split(/[\s,]+/, $if_none_match);
    foreach my $possible_etag (@if_none) {
        # remove quotes from begin and end of the string
        $possible_etag =~ s/^\"//g;
        $possible_etag =~ s/\"$//g;
        if ($possible_etag eq $valid_etag or $possible_etag eq '*') {
            print $self->header(-ETag => $possible_etag,
                                -status => '304 Not Modified');
            exit;
        }
    }
}

# Have to add the cookies in.
sub multipart_start {
    my $self = shift;
    
    my %args = @_;

    # CGI.pm::multipart_start doesn't honour its own charset information, so
    # we do it ourselves here
    if (defined $self->charset() && defined $args{-type}) {
        # Remove any existing charset specifier
        $args{-type} =~ s/;.*$//;
        # and add the specified one
        $args{-type} .= '; charset=' . $self->charset();
    }
        
    my $headers = $self->SUPER::multipart_start(%args);
    # Eliminate the one extra CRLF at the end.
    $headers =~ s/$CGI::CRLF$//;
    # Add the cookies. We have to do it this way instead of
    # passing them to multpart_start, because CGI.pm's multipart_start
    # doesn't understand a '-cookie' argument pointing to an arrayref.
    foreach my $cookie (@{$self->{Bugzilla_cookie_list}}) {
        $headers .= "Set-Cookie: ${cookie}${CGI::CRLF}";
    }
    $headers .= $CGI::CRLF;
    return $headers;
}

# Override header so we can add the cookies in
sub header {
    my $self = shift;

    # If there's only one parameter, then it's a Content-Type.
    if (scalar(@_) == 1) {
        # Since we're adding parameters below, we have to name it.
        unshift(@_, '-type' => shift(@_));
    }

    # Add the cookies in if we have any
    if (scalar(@{$self->{Bugzilla_cookie_list}})) {
        unshift(@_, '-cookie' => $self->{Bugzilla_cookie_list});
    }

    # Add Strict-Transport-Security (STS) header if this response
    # is over SSL and the strict_transport_security param is turned on.
    if ($self->https && !$self->url_is_attachment_base
        && Bugzilla->params->{'strict_transport_security'} ne 'off') 
    {
        my $sts_opts = 'max-age=' . MAX_STS_AGE;
        if (Bugzilla->params->{'strict_transport_security'} 
            eq 'include_subdomains')
        {
            $sts_opts .= '; includeSubDomains';
        }
        unshift(@_, '-strict_transport_security' => $sts_opts);
    }

    # Add X-Frame-Options header to prevent framing and subsequent
    # possible clickjacking problems.
    unless ($self->url_is_attachment_base) {
        unshift(@_, '-x_frame_options' => 'SAMEORIGIN');
    }

    # Add X-XSS-Protection header to prevent simple XSS attacks
    # and enforce the blocking (rather than the rewriting) mode.
    unshift(@_, '-x_xss_protection' => '1; mode=block');

    # Add X-Content-Type-Options header to prevent browsers sniffing
    # the MIME type away from the declared Content-Type.
    unshift(@_, '-x_content_type_options' => 'nosniff');

    return $self->SUPER::header(@_) || "";
}

sub param {
    my $self = shift;

    # When we are just requesting the value of a parameter...
    if (scalar(@_) == 1) {
        my @result = $self->SUPER::param(@_); 

        # Also look at the URL parameters, after we look at the POST 
        # parameters. This is to allow things like login-form submissions
        # with URL parameters in the form's "target" attribute.
        if (!scalar(@result)
            && $self->request_method && $self->request_method eq 'POST')
        {
            # Some servers fail to set the QUERY_STRING parameter, which
            # causes undef issues
            $ENV{'QUERY_STRING'} = '' unless exists $ENV{'QUERY_STRING'};
            @result = $self->SUPER::url_param(@_);
        }

        # Fix UTF-8-ness of input parameters.
        if (Bugzilla->params->{'utf8'}) {
            @result = map { _fix_utf8($_) } @result;
        }

        return wantarray ? @result : $result[0];
    }
    # And for various other functions in CGI.pm, we need to correctly
    # return the URL parameters in addition to the POST parameters when
    # asked for the list of parameters.
    elsif (!scalar(@_) && $self->request_method 
           && $self->request_method eq 'POST') 
    {
        my @post_params = $self->SUPER::param;
        my @url_params  = $self->url_param;
        my %params = map { $_ => 1 } (@post_params, @url_params);
        return keys %params;
    }

    return $self->SUPER::param(@_);
}

sub _fix_utf8 {
    my $input = shift;
    # The is_utf8 is here in case CGI gets smart about utf8 someday.
    utf8::decode($input) if defined $input && !utf8::is_utf8($input);
    return $input;
}

sub should_set {
    my ($self, $param) = @_;
    my $set = (defined $self->param($param) 
               or defined $self->param("defined_$param"))
              ? 1 : 0;
    return $set;
}

# The various parts of Bugzilla which create cookies don't want to have to
# pass them around to all of the callers. Instead, store them locally here,
# and then output as required from |header|.
sub send_cookie {
    my $self = shift;

    # Move the param list into a hash for easier handling.
    my %paramhash;
    my @paramlist;
    my ($key, $value);
    while ($key = shift) {
        $value = shift;
        $paramhash{$key} = $value;
    }

    # Complain if -value is not given or empty (bug 268146).
    if (!exists($paramhash{'-value'}) || !$paramhash{'-value'}) {
        ThrowCodeError('cookies_need_value');
    }

    # Add the default path and the domain in.
    $paramhash{'-path'} = Bugzilla->params->{'cookiepath'};
    $paramhash{'-domain'} = Bugzilla->params->{'cookiedomain'}
        if Bugzilla->params->{'cookiedomain'};

    # Move the param list back into an array for the call to cookie().
    foreach (keys(%paramhash)) {
        unshift(@paramlist, $_ => $paramhash{$_});
    }

    push(@{$self->{'Bugzilla_cookie_list'}}, $self->cookie(@paramlist));
}

# Cookies are removed by setting an expiry date in the past.
# This method is a send_cookie wrapper doing exactly this.
sub remove_cookie {
    my $self = shift;
    my ($cookiename) = (@_);

    # Expire the cookie, giving a non-empty dummy value (bug 268146).
    $self->send_cookie('-name'    => $cookiename,
                       '-expires' => 'Tue, 15-Sep-1998 21:49:00 GMT',
                       '-value'   => 'X');
}

# This helps implement Bugzilla::Search::Recent, and also shortens search
# URLs that get POSTed to buglist.cgi.
sub redirect_search_url {
    my $self = shift;

    # If there is no parameter, there is nothing to do.
    return unless $self->param;

    # If we're retreiving an old list, we never need to redirect or
    # do anything related to Bugzilla::Search::Recent.
    return if $self->param('regetlastlist');

    my $user = Bugzilla->user;

    if ($user->id) {
        # There are two conditions that could happen here--we could get a URL
        # with no list id, and we could get a URL with a list_id that isn't
        # ours.
        my $list_id = $self->param('list_id');
        if ($list_id) {
            # If we have a valid list_id, no need to redirect or clean.
            return if Bugzilla::Search::Recent->check_quietly(
                { id => $list_id });
        }
    }
    elsif ($self->request_method ne 'POST') {
        # Logged-out users who do a GET don't get a list_id, don't get
        # their URLs cleaned, and don't get redirected.
        return;
    }

    my $no_redirect = $self->param('no_redirect');
    $self->clean_search_url();

    # Make sure we still have params still after cleaning otherwise we 
    # do not want to store a list_id for an empty search.
    if ($user->id && $self->param) {
        # Insert a placeholder Bugzilla::Search::Recent, so that we know what
        # the id of the resulting search will be. This is then pulled out
        # of the Referer header when viewing show_bug.cgi to know what
        # bug list we came from.
        my $recent_search = Bugzilla::Search::Recent->create_placeholder;
        $self->param('list_id', $recent_search->id);
    }

    # Browsers which support history.replaceState do not need to be
    # redirected. We can fix the URL on the fly.
    return if $no_redirect;

    # GET requests that lacked a list_id are always redirected. POST requests
    # are only redirected if they're under the CGI_URI_LIMIT though.
    my $uri_length = length($self->self_url());
    if ($self->request_method() ne 'POST' or $uri_length < CGI_URI_LIMIT) {
        print $self->redirect(-url => $self->self_url());
        exit;
    }
}

sub redirect_to_https {
    my $self = shift;
    my $sslbase = Bugzilla->params->{'sslbase'};
    # If this is a POST, we don't want ?POSTDATA in the query string.
    # We expect the client to re-POST, which may be a violation of
    # the HTTP spec, but the only time we're expecting it often is
    # in the WebService, and WebService clients usually handle this
    # correctly.
    $self->delete('POSTDATA');
    my $url = $sslbase . $self->url('-path_info' => 1, '-query' => 1, 
                                    '-relative' => 1);

    # XML-RPC clients (SOAP::Lite at least) require a 301 to redirect properly
    # and do not work with 302. Our redirect really is permanent anyhow, so
    # it doesn't hurt to make it a 301.
    print $self->redirect(-location => $url, -status => 301);

    # When using XML-RPC with mod_perl, we need the headers sent immediately.
    $self->r->rflush if $ENV{MOD_PERL};
    exit;
}

# Redirect to the urlbase version of the current URL.
sub redirect_to_urlbase {
    my $self = shift;
    my $path = $self->url('-path_info' => 1, '-query' => 1, '-relative' => 1);
    print $self->redirect('-location' => correct_urlbase() . $path);
    exit;
}

sub url_is_attachment_base {
    my ($self, $id) = @_;
    return 0 if !use_attachbase() or !i_am_cgi();
    my $attach_base = Bugzilla->params->{'attachment_base'};
    # If we're passed an id, we only want one specific attachment base
    # for a particular bug. If we're not passed an ID, we just want to
    # know if our current URL matches the attachment_base *pattern*.
    my $regex;
    if ($id) {
        $attach_base =~ s/\%bugid\%/$id/;
        $regex = quotemeta($attach_base);
    }
    else {
        # In this circumstance we run quotemeta first because we need to
        # insert an active regex meta-character afterward.
        $regex = quotemeta($attach_base);
        $regex =~ s/\\\%bugid\\\%/\\d+/;
    }
    $regex = "^$regex";
    return ($self->self_url =~ $regex) ? 1 : 0;
}

##########################
# Vars TIEHASH Interface #
##########################

# Fix the TIEHASH interface (scalar $cgi->Vars) to return and accept 
# arrayrefs.
sub STORE {
    my $self = shift;
    my ($param, $value) = @_;
    if (defined $value and ref $value eq 'ARRAY') {
        return $self->param(-name => $param, -value => $value);
    }
    return $self->SUPER::STORE(@_);
}

sub FETCH {
    my ($self, $param) = @_;
    return $self if $param eq 'CGI'; # CGI.pm did this, so we do too.
    my @result = $self->param($param);
    return undef if !scalar(@result);
    return $result[0] if scalar(@result) == 1;
    return \@result;
}

# For the Vars TIEHASH interface: the normal CGI.pm DELETE doesn't return 
# the value deleted, but Perl's "delete" expects that value.
sub DELETE {
    my ($self, $param) = @_;
    my $value = $self->FETCH($param);
    $self->delete($param);
    return $value;
}

1;

__END__

=head1 NAME

Bugzilla::CGI - CGI handling for Bugzilla

=head1 SYNOPSIS

  use Bugzilla::CGI;

  my $cgi = new Bugzilla::CGI();

=head1 DESCRIPTION

This package inherits from the standard CGI module, to provide additional
Bugzilla-specific functionality. In general, see L<the CGI.pm docs|CGI> for
documention.

=head1 CHANGES FROM L<CGI.PM|CGI>

Bugzilla::CGI has some differences from L<CGI.pm|CGI>.

=over 4

=item C<cgi_error> is automatically checked

After creating the CGI object, C<Bugzilla::CGI> automatically checks
I<cgi_error>, and throws a CodeError if a problem is detected.

=back

=head1 ADDITIONAL FUNCTIONS

I<Bugzilla::CGI> also includes additional functions.

=over 4

=item C<canonicalise_query(@exclude)>

This returns a sorted string of the parameters, suitable for use in a url.
Values in C<@exclude> are not included in the result.

=item C<send_cookie>

This routine is identical to the cookie generation part of CGI.pm's C<cookie>
routine, except that it knows about Bugzilla's cookie_path and cookie_domain
parameters and takes them into account if necessary.
This should be used by all Bugzilla code (instead of C<cookie> or the C<-cookie>
argument to C<header>), so that under mod_perl the headers can be sent
correctly, using C<print> or the mod_perl APIs as appropriate.

To remove (expire) a cookie, use C<remove_cookie>.

=item C<remove_cookie>

This is a wrapper around send_cookie, setting an expiry date in the past,
effectively removing the cookie.

As its only argument, it takes the name of the cookie to expire.

=item C<redirect_to_https>

This routine redirects the client to the https version of the page that
they're looking at, using the C<sslbase> parameter for the redirection.

Generally you should use L<Bugzilla::Util/do_ssl_redirect_if_required>
instead of calling this directly.

=item C<redirect_to_urlbase>

Redirects from the current URL to one prefixed by the urlbase parameter.

=back

=head1 SEE ALSO

L<CGI|CGI>, L<CGI::Cookie|CGI::Cookie>