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 $session=shift;
  14
  15         if ($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         # MITLOGIN: These should be restored when logins are allowed again.
 125         #my $buttons=["Login"];
 126         my $buttons=[];
 127
 128         $form->field(name => "do", type => "hidden", value => "signin",
 129                 force => 1);
 130
 131         decode_form_utf8($form);
 132         run_hooks(formbuilder_setup => sub {
 133                 shift->(form => $form, cgi => $q, session => $session,
 134                         buttons => $buttons);
 135         });
 136         decode_form_utf8($form);
 137
 138         if ($form->submitted) {
 139                 $form->validate;
 140         }
 141
 142         if ($returnhtml) {
 143                 $form=prepform($form, $buttons, $session, $q);
 144                 return $form->render(submit => $buttons);
 145         }
 146
 147         showform($form, $buttons, $session, $q);
 148 }
 149
 150 sub cgi_postsignin ($$) {
 151         my $q=shift;
 152         my $session=shift;
 153
 154         # Continue with whatever was being done before the signin process.
 155         if (defined $session->param("postsignin")) {
 156                 my $postsignin=CGI->new($session->param("postsignin"));
 157                 $session->clear("postsignin");
 158                 cgi($postsignin, $session);
 159                 cgi_savesession($session);
 160                 exit;
 161         }
 162         else {
 163                 if ($config{sslcookie} && ! $q->https()) {
 164                         error(gettext("probable misconfiguration: sslcookie is set, but you are attempting to login via http, not https"));
 165                 }
 166                 else {
 167                         error(gettext("login failed, perhaps you need to turn on cookies?"));
 168                 }
 169         }
 170 }
 171
 172 sub cgi_prefs ($$) {
 173         my $q=shift;
 174         my $session=shift;
 175
 176         needsignin($q, $session);
 177         decode_cgi_utf8($q);
 178
 179         # The session id is stored on the form and checked to
 180         # guard against CSRF.
 181         my $sid=$q->param('sid');
 182         if (! defined $sid) {
 183                 $q->delete_all;
 184         }
 185         elsif ($sid ne $session->id) {
 186                 error(gettext("Your login session has expired."));
 187         }
 188
 189         eval q{use CGI::FormBuilder};
 190         error($@) if $@;
 191         my $form = CGI::FormBuilder->new(
 192                 title => "preferences",
 193                 name => "preferences",
 194                 header => 0,
 195                 charset => "utf-8",
 196                 method => 'POST',
 197                 validate => {
 198                         email => 'EMAIL',
 199                 },
 200                 required => 'NONE',
 201                 javascript => 0,
 202                 params => $q,
 203                 action => $config{cgiurl},
 204                 template => {type => 'div'},
 205                 stylesheet => 1,
 206                 fieldsets => [
 207                         [login => gettext("Login")],
 208                         [preferences => gettext("Preferences")],
 209                         [admin => gettext("Admin")]
 210                 ],
 211         );
 212         my $buttons=["Save Preferences", "Logout", "Cancel"];
 213
 214         decode_form_utf8($form);
 215         run_hooks(formbuilder_setup => sub {
 216                 shift->(form => $form, cgi => $q, session => $session,
 217                         buttons => $buttons);
 218         });
 219         decode_form_utf8($form);
 220
 221         $form->field(name => "do", type => "hidden", value => "prefs",
 222                 force => 1);
 223         $form->field(name => "sid", type => "hidden", value => $session->id,
 224                 force => 1);
 225             #$form->field(name => "email", size => 50, fieldset => "preferences");
 226         $form->field(name => "realname", size => 50, fieldset => "preferences");
 227
 228         my $user_name=$session->param("name");
 229
 230         if (! $form->submitted) {
 231             #$form->field(name => "email", force => 1,
 232             #value => userinfo_get($user_name, "email"));
 233                 $form->field(name => "realname", force => 1,
 234                         value => userinfo_get($user_name, "realname"));
 235         }
 236
 237         if ($form->submitted eq 'Logout') {
 238                 $session->delete();
 239                 redirect($q, $config{url});
 240                 return;
 241         }
 242         elsif ($form->submitted eq 'Cancel') {
 243                 redirect($q, $config{url});
 244                 return;
 245         }
 246         elsif ($form->submitted eq 'Save Preferences' && $form->validate) {
 247                 if (defined $form->field('email')) {
 248                         userinfo_set($user_name, 'email', $form->field('email')) ||
 249                                 error("failed to set email");
 250                 }
 251                 if (defined $form->field('realname')) {
 252                         userinfo_set($user_name, 'realname', $form->field('realname')) ||
 253                                 error("failed to set realname");
 254                 }
 255                 $form->text(gettext("Preferences saved."));
 256         }
 257
 258         showform($form, $buttons, $session, $q);
 259 }
 260
 261 sub cgi_custom_failure ($$$) {
 262         my $q=shift;
 263         my $httpstatus=shift;
 264         my $message=shift;
 265
 266         print $q->header(
 267                 -status => $httpstatus,
 268                 -charset => 'utf-8',
 269         );
 270         print $message;
 271
 272         # Internet Explod^Hrer won't show custom 404 responses
 273         # unless they're >= 512 bytes
 274         print ' ' x 512;
 275
 276         exit;
 277 }
 278
 279 sub check_banned ($$) {
 280         my $q=shift;
 281         my $session=shift;
 282
 283         my $banned=0;
 284         my $name=$session->param("name");
 285         if (defined $name &&
 286             grep { $name eq $_ } @{$config{banned_users}}) {
 287                 $banned=1;
 288         }
 289
 290         foreach my $b (@{$config{banned_users}}) {
 291                 if (pagespec_match("", $b,
 292                         ip => $ENV{REMOTE_ADDR},
 293                         name => defined $name ? $name : "",
 294                 )) {
 295                         $banned=1;
 296                         last;
 297                 }
 298         }
 299
 300         if ($banned) {
 301                 $session->delete();
 302                 cgi_savesession($session);
 303                 cgi_custom_failure(
 304                         $q, "403 Forbidden",
 305                         gettext("You are banned."));
 306         }
 307 }
 308
 309 sub cgi_getsession ($) {
 310         my $q=shift;
 311
 312         eval q{use CGI::Session; use HTML::Entities};
 313         error($@) if $@;
 314         CGI::Session->name("ikiwiki_session_".encode_entities($config{wikiname}));
 315
 316         my $oldmask=umask(077);
 317         my $session = eval {
 318                 CGI::Session->new("driver:DB_File", $q,
 319                         { FileName => "$config{wikistatedir}/sessions.db" })
 320         };
 321         if (! $session || $@) {
 322                 error($@." ".CGI::Session->errstr());
 323         }
 324
 325         umask($oldmask);
 326
 327         return $session;
 328 }
 329
 330 # To guard against CSRF, the user's session id (sid)
 331 # can be stored on a form. This function will check
 332 # (for logged in users) that the sid on the form matches
 333 # the session id in the cookie.
 334 sub checksessionexpiry ($$) {
 335         my $q=shift;
 336         my $session = shift;
 337
 338         if (defined $session->param("name")) {
 339                 my $sid=$q->param('sid');
 340                 if (! defined $sid || $sid ne $session->id) {
 341                         error(gettext("Your login session has expired."));
 342                 }
 343         }
 344 }
 345
 346 sub cgi_savesession ($) {
 347         my $session=shift;
 348
 349         # Force session flush with safe umask.
 350         my $oldmask=umask(077);
 351         $session->flush;
 352         umask($oldmask);
 353 }
 354
 355 sub cgi (;$$) {
 356         my $q=shift;
 357         my $session=shift;
 358
 359         eval q{use CGI};
 360         error($@) if $@;
 361         $CGI::DISABLE_UPLOADS=$config{cgi_disable_uploads};
 362
 363         if (! $q) {
 364                 binmode(STDIN);
 365                 $q=CGI->new;
 366                 binmode(STDIN, ":utf8");
 367
 368                 run_hooks(cgi => sub { shift->($q) });
 369         }
 370
 371         my $do=$q->param('do');
 372         if (! defined $do || ! length $do) {
 373                 my $error = $q->cgi_error;
 374                 if ($error) {
 375                         error("Request not processed: $error");
 376                 }
 377                 else {
 378                         error("\"do\" parameter missing");
 379                 }
 380         }
 381
 382         # Need to lock the wiki before getting a session.
 383         lockwiki();
 384         loadindex();
 385
 386         if (! $session) {
 387                 $session=cgi_getsession($q);
 388         }
 389
 390         # Auth hooks can sign a user in.
 391         if ($do ne 'signin' && ! defined $session->param("name")) {
 392                 run_hooks(auth => sub {
 393                         shift->($q, $session)
 394                 });
 395                 if (defined $session->param("name")) {
 396                         # Make sure whatever user was authed is in the
 397                         # userinfo db.
 398                         if (! userinfo_get($session->param("name"), "regdate")) {
 399                                 userinfo_setall($session->param("name"), {
 400                                         email => "",
 401                                         password => "",
 402                                         regdate => time,
 403                                 }) || error("failed adding user");
 404                         }
 405                 }
 406         }
 407
 408         check_banned($q, $session);
 409
 410         run_hooks(sessioncgi => sub { shift->($q, $session) });
 411
 412         if ($do eq 'signin') {
 413                 cgi_signin($q, $session);
 414                 cgi_savesession($session);
 415         }
 416         elsif ($do eq 'prefs') {
 417                 cgi_prefs($q, $session);
 418         }
 419         elsif (defined $session->param("postsignin") || $do eq 'postsignin') {
 420                 cgi_postsignin($q, $session);
 421         }
 422         else {
 423                 error("unknown do parameter");
 424         }
 425 }
 426
 427 # Does not need to be called directly; all errors will go through here.
 428 sub cgierror ($) {
 429         my $message=shift;
 430
 431         print "Content-type: text/html\n\n";
 432         print misctemplate(gettext("Error"),
 433                 "<p class=\"error\">".gettext("Error").": $message</p>");
 434         die $@;
 435 }
 436
 437 1