IkiWiki/CGI.pm

   1 #!/usr/bin/perl
   2
   3 package IkiWiki;
   4
   5 use warnings;
   6 use strict;
   7 use IkiWiki;
   8 use IkiWiki::UserInfo;
   9 use open qw{:utf8 :std};
  10 use Encode;
  11
  12 sub printheader ($) {
  13         my $session=shift;
  14
  15         if ($ENV{HTTPS} || $config{sslcookie}) {
  16                 print $session->header(-charset => 'utf-8',
  17                         -cookie => $session->cookie(-httponly => 1, -secure => 1));
  18         }
  19         else {
  20                 print $session->header(-charset => 'utf-8',
  21                         -cookie => $session->cookie(-httponly => 1));
  22         }
  23 }
  24
  25 sub prepform {
  26         my $form=shift;
  27         my $buttons=shift;
  28         my $session=shift;
  29         my $cgi=shift;
  30
  31         if (exists $hooks{formbuilder}) {
  32                 run_hooks(formbuilder => sub {
  33                         shift->(form => $form, cgi => $cgi, session => $session,
  34                                 buttons => $buttons);
  35                 });
  36         }
  37
  38         return $form;
  39 }
  40
  41 sub showform ($$$$;@) {
  42         my $form=prepform(@_);
  43         shift;
  44         my $buttons=shift;
  45         my $session=shift;
  46         my $cgi=shift;
  47
  48         printheader($session);
  49         print misctemplate($form->title, $form->render(submit => $buttons), @_);
  50 }
  51
  52 sub redirect ($$) {
  53         my $q=shift;
  54         eval q{use URI};
  55         my $url=URI->new(shift);
  56         if (! $config{w3mmode}) {
  57                 print $q->redirect($url);
  58         }
  59         else {
  60                 print "Content-type: text/plain\n";
  61                 print "W3m-control: GOTO $url\n\n";
  62         }
  63 }
  64
  65 sub decode_cgi_utf8 ($) {
  66         # decode_form_utf8 method is needed for 5.01
  67         if ($] < 5.01) {
  68                 my $cgi = shift;
  69                 foreach my $f ($cgi->param) {
  70                         $cgi->param($f, map { decode_utf8 $_ } $cgi->param($f));
  71                 }
  72         }
  73 }
  74
  75 sub decode_form_utf8 ($) {
  76         if ($] >= 5.01) {
  77                 my $form = shift;
  78                 foreach my $f ($form->field) {
  79                         my @value=map { decode_utf8($_) } $form->field($f);
  80                         $form->field(name  => $f,
  81                                      value => \@value,
  82                                      force => 1,
  83                         );
  84                 }
  85         }
  86 }
  87
  88 # Check if the user is signed in. If not, redirect to the signin form and
  89 # save their place to return to later.
  90 sub needsignin ($$) {
  91         my $q=shift;
  92         my $session=shift;
  93
  94         if (! defined $session->param("name") ||
  95             ! userinfo_get($session->param("name"), "regdate")) {
  96                 $session->param(postsignin => $ENV{QUERY_STRING});
  97                 cgi_signin($q, $session);
  98                 cgi_savesession($session);
  99                 exit;
 100         }
 101 }
 102
 103 sub cgi_signin ($$;$) {
 104         my $q=shift;
 105         my $session=shift;
 106         my $returnhtml=shift;
 107
 108         decode_cgi_utf8($q);
 109         eval q{use CGI::FormBuilder};
 110         error($@) if $@;
 111         my $form = CGI::FormBuilder->new(
 112                 title => "signin",
 113                 name => "signin",
 114                 charset => "utf-8",
 115                 method => 'POST',
 116                 required => 'NONE',
 117                 javascript => 0,
 118                 params => $q,
 119                 action => $config{cgiurl},
 120                 header => 0,
 121                 template => {type => 'div'},
 122                 stylesheet => 1,
 123         );
 124         my $buttons=["Login"];
 125
 126         $form->field(name => "do", type => "hidden", value => "signin",
 127                 force => 1);
 128
 129         decode_form_utf8($form);
 130         run_hooks(formbuilder_setup => sub {
 131                 shift->(form => $form, cgi => $q, session => $session,
 132                         buttons => $buttons);
 133         });
 134         decode_form_utf8($form);
 135
 136         if ($form->submitted) {
 137                 $form->validate;
 138         }
 139
 140         if ($returnhtml) {
 141                 $form=prepform($form, $buttons, $session, $q);
 142                 return $form->render(submit => $buttons);
 143         }
 144
 145         showform($form, $buttons, $session, $q);
 146 }
 147
 148 sub cgi_postsignin ($$) {
 149         my $q=shift;
 150         my $session=shift;
 151
 152         # Continue with whatever was being done before the signin process.
 153         if (defined $session->param("postsignin")) {
 154                 my $postsignin=CGI->new($session->param("postsignin"));
 155                 $session->clear("postsignin");
 156                 cgi($postsignin, $session);
 157                 cgi_savesession($session);
 158                 exit;
 159         }
 160         else {
 161                 if ($config{sslcookie} && ! $q->https()) {
 162                         error(gettext("probable misconfiguration: sslcookie is set, but you are attempting to login via http, not https"));
 163                 }
 164                 else {
 165                         error(gettext("login failed, perhaps you need to turn on cookies?"));
 166                 }
 167         }
 168 }
 169
 170 sub cgi_prefs ($$) {
 171         my $q=shift;
 172         my $session=shift;
 173
 174         needsignin($q, $session);
 175         decode_cgi_utf8($q);
 176
 177         # The session id is stored on the form and checked to
 178         # guard against CSRF.
 179         my $sid=$q->param('sid');
 180         if (! defined $sid) {
 181                 $q->delete_all;
 182         }
 183         elsif ($sid ne $session->id) {
 184                 error(gettext("Your login session has expired."));
 185         }
 186
 187         eval q{use CGI::FormBuilder};
 188         error($@) if $@;
 189         my $form = CGI::FormBuilder->new(
 190                 title => "preferences",
 191                 name => "preferences",
 192                 header => 0,
 193                 charset => "utf-8",
 194                 method => 'POST',
 195                 validate => {
 196                         email => 'EMAIL',
 197                 },
 198                 required => 'NONE',
 199                 javascript => 0,
 200                 params => $q,
 201                 action => $config{cgiurl},
 202                 template => {type => 'div'},
 203                 stylesheet => 1,
 204                 fieldsets => [
 205                         [login => gettext("Login")],
 206                         [preferences => gettext("Preferences")],
 207                         [admin => gettext("Admin")]
 208                 ],
 209         );
 210         my $buttons=["Save Preferences", "Logout", "Cancel"];
 211
 212         decode_form_utf8($form);
 213         run_hooks(formbuilder_setup => sub {
 214                 shift->(form => $form, cgi => $q, session => $session,
 215                         buttons => $buttons);
 216         });
 217         decode_form_utf8($form);
 218
 219         $form->field(name => "do", type => "hidden", value => "prefs",
 220                 force => 1);
 221         $form->field(name => "sid", type => "hidden", value => $session->id,
 222                 force => 1);
 223         $form->field(name => "email", size => 50, fieldset => "preferences");
 224
 225         my $user_name=$session->param("name");
 226
 227         if (! $form->submitted) {
 228                 $form->field(name => "email", force => 1,
 229                         value => userinfo_get($user_name, "email"));
 230         }
 231
 232         if ($form->submitted eq 'Logout') {
 233                 $session->delete();
 234                 redirect($q, $config{url});
 235                 return;
 236         }
 237         elsif ($form->submitted eq 'Cancel') {
 238                 redirect($q, $config{url});
 239                 return;
 240         }
 241         elsif ($form->submitted eq 'Save Preferences' && $form->validate) {
 242                 if (defined $form->field('email')) {
 243                         userinfo_set($user_name, 'email', $form->field('email')) ||
 244                                 error("failed to set email");
 245                 }
 246
 247                 $form->text(gettext("Preferences saved."));
 248         }
 249
 250         showform($form, $buttons, $session, $q,
 251                 prefsurl => "", # avoid showing the preferences link
 252         );
 253 }
 254
 255 sub cgi_custom_failure ($$$) {
 256         my $q=shift;
 257         my $httpstatus=shift;
 258         my $message=shift;
 259
 260         print $q->header(
 261                 -status => $httpstatus,
 262                 -charset => 'utf-8',
 263         );
 264         print $message;
 265
 266         # Internet Explod^Hrer won't show custom 404 responses
 267         # unless they're >= 512 bytes
 268         print ' ' x 512;
 269
 270         exit;
 271 }
 272
 273 sub check_banned ($$) {
 274         my $q=shift;
 275         my $session=shift;
 276
 277         my $banned=0;
 278         my $name=$session->param("name");
 279         if (defined $name &&
 280             grep { $name eq $_ } @{$config{banned_users}}) {
 281                 $banned=1;
 282         }
 283
 284         foreach my $b (@{$config{banned_users}}) {
 285                 if (pagespec_match("", $b,
 286                         ip => $session->remote_addr(),
 287                         name => defined $name ? $name : "",
 288                 )) {
 289                         $banned=1;
 290                         last;
 291                 }
 292         }
 293
 294         if ($banned) {
 295                 $session->delete();
 296                 cgi_savesession($session);
 297                 cgi_custom_failure(
 298                         $q, "403 Forbidden",
 299                         gettext("You are banned."));
 300         }
 301 }
 302
 303 sub cgi_getsession ($) {
 304         my $q=shift;
 305
 306         eval q{use CGI::Session; use HTML::Entities};
 307         error($@) if $@;
 308         CGI::Session->name("ikiwiki_session_".encode_entities($config{wikiname}));
 309
 310         my $oldmask=umask(077);
 311         my $session = eval {
 312                 CGI::Session->new("driver:DB_File", $q,
 313                         { FileName => "$config{wikistatedir}/sessions.db" })
 314         };
 315         if (! $session || $@) {
 316                 error($@." ".CGI::Session->errstr());
 317         }
 318
 319         umask($oldmask);
 320
 321         return $session;
 322 }
 323
 324 # To guard against CSRF, the user's session id (sid)
 325 # can be stored on a form. This function will check
 326 # (for logged in users) that the sid on the form matches
 327 # the session id in the cookie.
 328 sub checksessionexpiry ($$) {
 329         my $q=shift;
 330         my $session = shift;
 331
 332         if (defined $session->param("name")) {
 333                 my $sid=$q->param('sid');
 334                 if (! defined $sid || $sid ne $session->id) {
 335                         error(gettext("Your login session has expired."));
 336                 }
 337         }
 338 }
 339
 340 sub cgi_savesession ($) {
 341         my $session=shift;
 342
 343         # Force session flush with safe umask.
 344         my $oldmask=umask(077);
 345         $session->flush;
 346         umask($oldmask);
 347 }
 348
 349 sub cgi (;$$) {
 350         my $q=shift;
 351         my $session=shift;
 352
 353         eval q{use CGI};
 354         error($@) if $@;
 355         $CGI::DISABLE_UPLOADS=$config{cgi_disable_uploads};
 356
 357         if (! $q) {
 358                 binmode(STDIN);
 359                 $q=CGI->new;
 360                 binmode(STDIN, ":utf8");
 361
 362                 run_hooks(cgi => sub { shift->($q) });
 363         }
 364
 365         my $do=$q->param('do');
 366         if (! defined $do || ! length $do) {
 367                 my $error = $q->cgi_error;
 368                 if ($error) {
 369                         error("Request not processed: $error");
 370                 }
 371                 else {
 372                         error("\"do\" parameter missing");
 373                 }
 374         }
 375
 376         # Need to lock the wiki before getting a session.
 377         lockwiki();
 378         loadindex();
 379
 380         if (! $session) {
 381                 $session=cgi_getsession($q);
 382         }
 383
 384         # Auth hooks can sign a user in.
 385         if ($do ne 'signin' && ! defined $session->param("name")) {
 386                 run_hooks(auth => sub {
 387                         shift->($q, $session)
 388                 });
 389                 if (defined $session->param("name")) {
 390                         # Make sure whatever user was authed is in the
 391                         # userinfo db.
 392                         if (! userinfo_get($session->param("name"), "regdate")) {
 393                                 userinfo_setall($session->param("name"), {
 394                                         email => "",
 395                                         password => "",
 396                                         regdate => time,
 397                                 }) || error("failed adding user");
 398                         }
 399                 }
 400         }
 401
 402         check_banned($q, $session);
 403
 404         run_hooks(sessioncgi => sub { shift->($q, $session) });
 405
 406         if ($do eq 'signin') {
 407                 cgi_signin($q, $session);
 408                 cgi_savesession($session);
 409         }
 410         elsif ($do eq 'prefs') {
 411                 cgi_prefs($q, $session);
 412         }
 413         elsif (defined $session->param("postsignin") || $do eq 'postsignin') {
 414                 cgi_postsignin($q, $session);
 415         }
 416         else {
 417                 error("unknown do parameter");
 418         }
 419 }
 420
 421 # Does not need to be called directly; all errors will go through here.
 422 sub cgierror ($) {
 423         my $message=shift;
 424
 425         print "Content-type: text/html\n\n";
 426         print misctemplate(gettext("Error"),
 427                 "<p class=\"error\">".gettext("Error").": $message</p>");
 428         die $@;
 429 }
 430
 431 1