Revert "Tell `git revert` not to follow renames (CVE-2016-10026)"

[git.ikiwiki.info.git] / IkiWiki / CGI.pm

diff --git a/IkiWiki/CGI.pm b/IkiWiki/CGI.pm
index 43986789a45614417f3837cf297c2840acb37455..878869ef1e43888183746f2e7db4b7eda53f538c 100644 (file)
--- a/IkiWiki/CGI.pm
+++ b/IkiWiki/CGI.pm
@@ -1,5 +1,7 @@
 #!/usr/bin/perl
 
 #!/usr/bin/perl
 

+package IkiWiki;
+

 use warnings;
 use strict;
 use IkiWiki;
 use warnings;
 use strict;
 use IkiWiki;


@@ -7,21 +9,20 @@ use IkiWiki::UserInfo;
 use open qw{:utf8 :std};
 use Encode;
 
 use open qw{:utf8 :std};
 use Encode;
 

-package IkiWiki;
-
-sub printheader ($) { #{{{
+sub printheader ($) {

        my $session=shift;
        
        my $session=shift;
        

-       if ($config{sslcookie}) {
+       if (($ENV{HTTPS} && lc $ENV{HTTPS} ne "off") || $config{sslcookie}) {

                print $session->header(-charset => 'utf-8',
                print $session->header(-charset => 'utf-8',

-                       -cookie => $session->cookie(-secure => 1));
-       } else {
-               print $session->header(-charset => 'utf-8');
+                       -cookie => $session->cookie(-httponly => 1, -secure => 1));

        }
        }

+       else {
+               print $session->header(-charset => 'utf-8',
+                       -cookie => $session->cookie(-httponly => 1));
+       }
+}

 
 

-} #}}}
-
-sub showform ($$$$;@) { #{{{
+sub prepform {

        my $form=shift;
        my $buttons=shift;
        my $session=shift;
        my $form=shift;
        my $buttons=shift;
        my $session=shift;


@@ -34,13 +35,62 @@ sub showform ($$$$;@) { #{{{
                });
        }
 
                });
        }
 

+       return $form;
+}
+
+sub showform ($$$$;@) {
+       my $form=prepform(@_);
+       shift;
+       my $buttons=shift;
+       my $session=shift;
+       my $cgi=shift;
+

        printheader($session);
        printheader($session);

-       print misctemplate($form->title, $form->render(submit => $buttons), @_);
+       print cgitemplate($cgi, $form->title,
+               $form->render(submit => $buttons), @_);
+}
+
+sub cgitemplate ($$$;@) {
+       my $cgi=shift;
+       my $title=shift;
+       my $content=shift;
+       my %params=@_;
+       
+       my $template=template("page.tmpl");
+
+       my $topurl = defined $cgi ? $cgi->url : $config{url};
+
+       my $page="";
+       if (exists $params{page}) {
+               $page=delete $params{page};
+               $params{forcebaseurl}=urlabs(urlto($page), $topurl);
+       }
+       run_hooks(pagetemplate => sub {
+               shift->(
+                       page => $page,
+                       destpage => $page,
+                       template => $template,
+               );
+       });
+       templateactions($template, "");
+
+       $template->param(
+               dynamic => 1,
+               title => $title,
+               wikiname => $config{wikiname},
+               content => $content,
+               baseurl => urlabs(baseurl(), $topurl),
+               html5 => $config{html5},
+               %params,
+       );
+       
+       return $template->output;

 }
 
 }
 

-sub redirect ($$) { #{{{
+sub redirect ($$) {

        my $q=shift;
        my $q=shift;

-       my $url=shift;
+       eval q{use URI};
+       my $url=URI->new(urlabs(shift, $q->url));

        if (! $config{w3mmode}) {
                print $q->redirect($url);
        }
        if (! $config{w3mmode}) {
                print $q->redirect($url);
        }


@@ -48,75 +98,50 @@ sub redirect ($$) { #{{{
                print "Content-type: text/plain\n";
                print "W3m-control: GOTO $url\n\n";
        }
                print "Content-type: text/plain\n";
                print "W3m-control: GOTO $url\n\n";
        }

-} #}}}
-
-sub check_canedit ($$$;$) { #{{{
-       my $page=shift;
-       my $q=shift;
-       my $session=shift;
-       my $nonfatal=shift;
-       
-       my $canedit;
-       run_hooks(canedit => sub {
-               return if defined $canedit;
-               my $ret=shift->($page, $q, $session);
-               if (defined $ret) {
-                       if ($ret eq "") {
-                               $canedit=1;
-                       }
-                       elsif (ref $ret eq 'CODE') {
-                               $ret->() unless $nonfatal;
-                               $canedit=0;
-                       }
-                       elsif (defined $ret) {
-                               error($ret) unless $nonfatal;
-                               $canedit=0;
-                       }
-               }
-       });
-       return $canedit;
-} #}}}
+}

 
 

-sub decode_cgi_utf8 ($) { #{{{
-       # decode_form_utf8 method is needed for 5.10
+sub decode_cgi_utf8 ($) {
+       # decode_form_utf8 method is needed for 5.01

        if ($] < 5.01) {
                my $cgi = shift;
                foreach my $f ($cgi->param) {
                        $cgi->param($f, map { decode_utf8 $_ } $cgi->param($f));
                }
        }
        if ($] < 5.01) {
                my $cgi = shift;
                foreach my $f ($cgi->param) {
                        $cgi->param($f, map { decode_utf8 $_ } $cgi->param($f));
                }
        }

-} #}}}
+}

 
 

-sub decode_form_utf8 ($) { #{{{
+sub decode_form_utf8 ($) {

        if ($] >= 5.01) {
                my $form = shift;
                foreach my $f ($form->field) {
        if ($] >= 5.01) {
                my $form = shift;
                foreach my $f ($form->field) {

+                       my @value=map { decode_utf8($_) } $form->field($f);

                        $form->field(name  => $f,
                        $form->field(name  => $f,

-                                    value => decode_utf8($form->field($f)),
+                                    value => \@value,

                                     force => 1,
                        );
                }
        }
                                     force => 1,
                        );
                }
        }

-} #}}}
+}

 
 # Check if the user is signed in. If not, redirect to the signin form and
 # save their place to return to later.
 
 # Check if the user is signed in. If not, redirect to the signin form and
 # save their place to return to later.

-sub needsignin ($$) { #{{{
+sub needsignin ($$) {

        my $q=shift;
        my $session=shift;
 
        if (! defined $session->param("name") ||
            ! userinfo_get($session->param("name"), "regdate")) {
        my $q=shift;
        my $session=shift;
 
        if (! defined $session->param("name") ||
            ! userinfo_get($session->param("name"), "regdate")) {

-               $session->param(postsignin => $ENV{QUERY_STRING});
+               $session->param(postsignin => $q->query_string);

                cgi_signin($q, $session);
                cgi_savesession($session);
                exit;
        }
                cgi_signin($q, $session);
                cgi_savesession($session);
                exit;
        }

-} #}}} 
+}

 
 

-sub cgi_signin ($$) { #{{{
+sub cgi_signin ($$;$) {

        my $q=shift;
        my $session=shift;
        my $q=shift;
        my $session=shift;

+       my $returnhtml=shift;

 
        decode_cgi_utf8($q);
        eval q{use CGI::FormBuilder};
 
        decode_cgi_utf8($q);
        eval q{use CGI::FormBuilder};


@@ -129,16 +154,13 @@ sub cgi_signin ($$) { #{{{
                required => 'NONE',
                javascript => 0,
                params => $q,
                required => 'NONE',
                javascript => 0,
                params => $q,

-               action => $config{cgiurl},
+               action => cgiurl(),

                header => 0,
                template => {type => 'div'},
                header => 0,
                template => {type => 'div'},

-               stylesheet => baseurl()."style.css",
+               stylesheet => 1,

        );
        my $buttons=["Login"];
        
        );
        my $buttons=["Login"];
        

-       if ($q->param("do") ne "signin" && !$form->submitted) {
-               $form->text(gettext("You need to log in first."));
-       }

        $form->field(name => "do", type => "hidden", value => "signin",
                force => 1);
        
        $form->field(name => "do", type => "hidden", value => "signin",
                force => 1);
        


@@ -153,10 +175,15 @@ sub cgi_signin ($$) { #{{{
                $form->validate;
        }
 
                $form->validate;
        }
 

+       if ($returnhtml) {
+               $form=prepform($form, $buttons, $session, $q);
+               return $form->render(submit => $buttons);
+       }
+

        showform($form, $buttons, $session, $q);
        showform($form, $buttons, $session, $q);

-} #}}}
+}

 
 

-sub cgi_postsignin ($$) { #{{{
+sub cgi_postsignin ($$) {

        my $q=shift;
        my $session=shift;
        
        my $q=shift;
        my $session=shift;
        


@@ -169,11 +196,16 @@ sub cgi_postsignin ($$) { #{{{
                exit;
        }
        else {
                exit;
        }
        else {

-               error(gettext("login failed, perhaps you need to turn on cookies?"));
+               if ($config{sslcookie} && ! $q->https()) {
+                       error(gettext("probable misconfiguration: sslcookie is set, but you are attempting to login via http, not https"));
+               }
+               else {
+                       error(gettext("login failed, perhaps you need to turn on cookies?"));
+               }

        }
        }

-} #}}}
+}

 
 

-sub cgi_prefs ($$) { #{{{
+sub cgi_prefs ($$) {

        my $q=shift;
        my $session=shift;
 
        my $q=shift;
        my $session=shift;
 


@@ -204,9 +236,9 @@ sub cgi_prefs ($$) { #{{{
                required => 'NONE',
                javascript => 0,
                params => $q,
                required => 'NONE',
                javascript => 0,
                params => $q,

-               action => $config{cgiurl},
+               action => cgiurl(),

                template => {type => 'div'},
                template => {type => 'div'},

-               stylesheet => baseurl()."style.css",
+               stylesheet => 1,

                fieldsets => [
                        [login => gettext("Login")],
                        [preferences => gettext("Preferences")],
                fieldsets => [
                        [login => gettext("Login")],
                        [preferences => gettext("Preferences")],


@@ -227,449 +259,139 @@ sub cgi_prefs ($$) { #{{{
        $form->field(name => "sid", type => "hidden", value => $session->id,
                force => 1);
        $form->field(name => "email", size => 50, fieldset => "preferences");
        $form->field(name => "sid", type => "hidden", value => $session->id,
                force => 1);
        $form->field(name => "email", size => 50, fieldset => "preferences");

-       $form->field(name => "banned_users", size => 50,
-               fieldset => "admin");

        
        my $user_name=$session->param("name");
        
        my $user_name=$session->param("name");

-       if (! is_admin($user_name)) {
-               $form->field(name => "banned_users", type => "hidden");
-       }

 
        if (! $form->submitted) {
                $form->field(name => "email", force => 1,
                        value => userinfo_get($user_name, "email"));
 
        if (! $form->submitted) {
                $form->field(name => "email", force => 1,
                        value => userinfo_get($user_name, "email"));

-               if (is_admin($user_name)) {
-                       $form->field(name => "banned_users", force => 1,
-                               value => join(" ", get_banned_users()));
-               }

        }
        
        if ($form->submitted eq 'Logout') {
                $session->delete();
        }
        
        if ($form->submitted eq 'Logout') {
                $session->delete();

-               redirect($q, $config{url});
+               redirect($q, baseurl(undef));

                return;
        }
        elsif ($form->submitted eq 'Cancel') {
                return;
        }
        elsif ($form->submitted eq 'Cancel') {

-               redirect($q, $config{url});
+               redirect($q, baseurl(undef));

                return;
        }
        elsif ($form->submitted eq 'Save Preferences' && $form->validate) {
                return;
        }
        elsif ($form->submitted eq 'Save Preferences' && $form->validate) {

-               if (defined $form->field('email')) {
-                       userinfo_set($user_name, 'email', $form->field('email')) ||
+               my $email = $form->field('email');
+               if (defined $email) {
+                       userinfo_set($user_name, 'email', $email) ||

                                error("failed to set email");
                }
                                error("failed to set email");
                }

-               if (is_admin($user_name)) {
-                       set_banned_users(grep { ! is_admin($_) }
-                                       split(' ',
-                                               $form->field("banned_users"))) ||
-                               error("failed saving changes");
-               }
+

                $form->text(gettext("Preferences saved."));
        }
        
                $form->text(gettext("Preferences saved."));
        }
        

-       showform($form, $buttons, $session, $q);
-} #}}}
+       showform($form, $buttons, $session, $q,
+               prefsurl => "", # avoid showing the preferences link
+       );
+}

 
 

-sub cgi_editpage ($$) { #{{{
+sub cgi_custom_failure ($$$) {

        my $q=shift;
        my $q=shift;

-       my $session=shift;
-       
-       decode_cgi_utf8($q);
+       my $httpstatus=shift;
+       my $message=shift;

 
 

-       my @fields=qw(do rcsinfo subpage from page type editcontent comments);
-       my @buttons=("Save Page", "Preview", "Cancel");
-       eval q{use CGI::FormBuilder};
-       error($@) if $@;
-       my $form = CGI::FormBuilder->new(
-               title => "editpage",
-               fields => \@fields,
-               charset => "utf-8",
-               method => 'POST',
-               required => [qw{editcontent}],
-               javascript => 0,
-               params => $q,
-               action => $config{cgiurl},
-               header => 0,
-               table => 0,
-               template => scalar template_params("editpage.tmpl"),
-               wikiname => $config{wikiname},
+       print $q->header(
+               -status => $httpstatus,
+               -charset => 'utf-8',

        );
        );

-       
-       decode_form_utf8($form);
-       run_hooks(formbuilder_setup => sub {
-               shift->(form => $form, cgi => $q, session => $session,
-                       buttons => \@buttons);
-       });
-       decode_form_utf8($form);
-       
-       # This untaint is safe because titlepage removes any problematic
-       # characters.
-       my ($page)=$form->field('page');
-       $page=titlepage(possibly_foolish_untaint($page));
-       if (! defined $page || ! length $page ||
-           file_pruned($page, $config{srcdir}) || $page=~/^\//) {
-               error("bad page name");
-       }
+       print $message;

 
 

-       my $baseurl=$config{url}."/".htmlpage($page);
-       
-       my $from;
-       if (defined $form->field('from')) {
-               ($from)=$form->field('from')=~/$config{wiki_file_regexp}/;
-       }
-       
-       my $file;
-       my $type;
-       if (exists $pagesources{$page} && $form->field("do") ne "create") {
-               $file=$pagesources{$page};
-               $type=pagetype($file);
-               if (! defined $type || $type=~/^_/) {
-                       error(sprintf(gettext("%s is not an editable page"), $page));
-               }
-               if (! $form->submitted) {
-                       $form->field(name => "rcsinfo",
-                               value => rcs_prepedit($file), force => 1);
-               }
-               $form->field(name => "editcontent", validate => '/.*/');
-       }
-       else {
-               $type=$form->param('type');
-               if (defined $type && length $type && $hooks{htmlize}{$type}) {
-                       $type=possibly_foolish_untaint($type);
-               }
-               elsif (defined $from && exists $pagesources{$from}) {
-                       # favor the type of linking page
-                       $type=pagetype($pagesources{$from});
-               }
-               $type=$config{default_pageext} unless defined $type;
-               $file=$page.".".$type;
-               if (! $form->submitted) {
-                       $form->field(name => "rcsinfo", value => "", force => 1);
-               }
-               $form->field(name => "editcontent", validate => '/.+/');
-       }
+       # Internet Explod^Hrer won't show custom 404 responses
+       # unless they're >= 512 bytes
+       print ' ' x 512;

 
 

-       $form->field(name => "do", type => 'hidden');
-       $form->field(name => "sid", type => "hidden", value => $session->id,
-               force => 1);
-       $form->field(name => "from", type => 'hidden');
-       $form->field(name => "rcsinfo", type => 'hidden');
-       $form->field(name => "subpage", type => 'hidden');
-       $form->field(name => "page", value => pagetitle($page, 1), force => 1);
-       $form->field(name => "type", value => $type, force => 1);
-       $form->field(name => "comments", type => "text", size => 80);
-       $form->field(name => "editcontent", type => "textarea", rows => 20,
-               cols => 80);
-       $form->tmpl_param("can_commit", $config{rcs});
-       $form->tmpl_param("indexlink", indexlink());
-       $form->tmpl_param("helponformattinglink",
-               htmllink($page, $page, "ikiwiki/formatting",
-                       noimageinline => 1,
-                       linktext => "FormattingHelp"));
-       
-       if ($form->submitted eq "Cancel") {
-               if ($form->field("do") eq "create" && defined $from) {
-                       redirect($q, "$config{url}/".htmlpage($from));
-               }
-               elsif ($form->field("do") eq "create") {
-                       redirect($q, $config{url});
-               }
-               else {
-                       redirect($q, "$config{url}/".htmlpage($page));
-               }
-               return;
-       }
-       elsif ($form->submitted eq "Preview") {
-               my $new=not exists $pagesources{$page};
-               if ($new) {
-                       # temporarily record its type
-                       $pagesources{$page}=$page.".".$type;
-               }
+       exit;
+}

 
 

-               my $content=$form->field('editcontent');
+sub check_banned ($$) {
+       my $q=shift;
+       my $session=shift;

 
 

-               run_hooks(editcontent => sub {
-                       $content=shift->(
-                               content => $content,
-                               page => $page,
-                               cgi => $q,
-                               session => $session,
-                       );
-               });
-               my $preview=htmlize($page, $page, $type,
-                       linkify($page, $page,
-                       preprocess($page, $page,
-                       filter($page, $page, $content), 0, 1)));
-               run_hooks(format => sub {
-                       $preview=shift->(
-                               page => $page,
-                               content => $preview,
-                       );
-               });
-               $form->tmpl_param("page_preview", $preview);
-       
-               if ($new) {
-                       delete $pagesources{$page};
-               }
-               # previewing may have created files on disk
-               saveindex();
-       }
-       elsif ($form->submitted eq "Save Page") {
-               $form->tmpl_param("page_preview", "");
+       my $banned=0;
+       my $name=$session->param("name");
+       if (defined $name && 
+           grep { $name eq $_ } @{$config{banned_users}}) {
+               $banned=1;

        }
        }

-       $form->tmpl_param("page_conflict", "");
-       
-       if ($form->submitted ne "Save Page" || ! $form->validate) {
-               if ($form->field("do") eq "create") {
-                       my @page_locs;
-                       my $best_loc;
-                       if (! defined $from || ! length $from ||
-                           $from ne $form->field('from') ||
-                           file_pruned($from, $config{srcdir}) ||
-                           $from=~/^\// ||
-                           $form->submitted eq "Preview") {
-                               @page_locs=$best_loc=$page;
-                       }
-                       else {
-                               my $dir=$from."/";
-                               $dir=~s![^/]+/+$!!;
-                               
-                               if ((defined $form->field('subpage') && length $form->field('subpage')) ||
-                                   $page eq gettext('discussion')) {
-                                       $best_loc="$from/$page";
-                               }
-                               else {
-                                       $best_loc=$dir.$page;
-                               }
-                               
-                               push @page_locs, $dir.$page;
-                               push @page_locs, "$from/$page";
-                               while (length $dir) {
-                                       $dir=~s![^/]+/+$!!;
-                                       push @page_locs, $dir.$page;
-                               }
-                       
-                               push @page_locs, "$config{userdir}/$page"
-                                       if length $config{userdir};
-                       }

 
 

-                       @page_locs = grep {
-                               ! exists $pagecase{lc $_}
-                       } @page_locs;
-                       if (! @page_locs) {
-                               # hmm, someone else made the page in the
-                               # meantime?
-                               if ($form->submitted eq "Preview") {
-                                       # let them go ahead with the edit
-                                       # and resolve the conflict at save
-                                       # time
-                                       @page_locs=$page;
-                               }
-                               else {
-                                       redirect($q, "$config{url}/".htmlpage($page));
-                                       return;
-                               }
-                       }
-
-                       my @editable_locs = grep {
-                               check_canedit($_, $q, $session, 1)
-                       } @page_locs;
-                       if (! @editable_locs) {
-                               # let it throw an error this time
-                               map { check_canedit($_, $q, $session) } @page_locs;
-                       }
-                       
-                       my @page_types;
-                       if (exists $hooks{htmlize}) {
-                               @page_types=grep { !/^_/ }
-                                       keys %{$hooks{htmlize}};
-                       }
-                       
-                       $form->tmpl_param("page_select", 1);
-                       $form->field(name => "page", type => 'select',
-                               options => [ map { pagetitle($_, 1) } @editable_locs ],
-                               value => pagetitle($best_loc, 1));
-                       $form->field(name => "type", type => 'select',
-                               options => \@page_types);
-                       $form->title(sprintf(gettext("creating %s"), pagetitle($page)));
-                       
-               }
-               elsif ($form->field("do") eq "edit") {
-                       check_canedit($page, $q, $session);
-                       if (! defined $form->field('editcontent') || 
-                           ! length $form->field('editcontent')) {
-                               my $content="";
-                               if (exists $pagesources{$page}) {
-                                       $content=readfile(srcfile($pagesources{$page}));
-                                       $content=~s/\n/\r\n/g;
-                               }
-                               $form->field(name => "editcontent", value => $content,
-                                       force => 1);
-                       }
-                       $form->tmpl_param("page_select", 0);
-                       $form->field(name => "page", type => 'hidden');
-                       $form->field(name => "type", type => 'hidden');
-                       $form->title(sprintf(gettext("editing %s"), pagetitle($page)));
+       foreach my $b (@{$config{banned_users}}) {
+               if (pagespec_match("", $b,
+                       ip => $session->remote_addr(),
+                       name => defined $name ? $name : "",
+               )) {
+                       $banned=1;
+                       last;

                }
                }

-               
-               showform($form, \@buttons, $session, $q, forcebaseurl => $baseurl);

        }
        }

-       else {
-               # save page
-               check_canedit($page, $q, $session);
-       
-               # The session id is stored on the form and checked to
-               # guard against CSRF. But only if the user is logged in,
-               # as anonok can allow anonymous edits.
-               if (defined $session->param("name")) {
-                       my $sid=$q->param('sid');
-                       if (! defined $sid || $sid ne $session->id) {
-                               error(gettext("Your login session has expired."));
-                       }
-               }
-
-               my $exists=-e "$config{srcdir}/$file";
-
-               if ($form->field("do") ne "create" && ! $exists &&
-                   ! defined srcfile($file, 1)) {
-                       $form->tmpl_param("page_gone", 1);
-                       $form->field(name => "do", value => "create", force => 1);
-                       $form->tmpl_param("page_select", 0);
-                       $form->field(name => "page", type => 'hidden');
-                       $form->field(name => "type", type => 'hidden');
-                       $form->title(sprintf(gettext("editing %s"), $page));
-                       showform($form, \@buttons, $session, $q, forcebaseurl => $baseurl);
-                       return;
-               }
-               elsif ($form->field("do") eq "create" && $exists) {
-                       $form->tmpl_param("creation_conflict", 1);
-                       $form->field(name => "do", value => "edit", force => 1);
-                       $form->tmpl_param("page_select", 0);
-                       $form->field(name => "page", type => 'hidden');
-                       $form->field(name => "type", type => 'hidden');
-                       $form->title(sprintf(gettext("editing %s"), $page));
-                       $form->field("editcontent", 
-                               value => readfile("$config{srcdir}/$file").
-                                        "\n\n\n".$form->field("editcontent"),
-                               force => 1);
-                       showform($form, \@buttons, $session, $q, forcebaseurl => $baseurl);
-                       return;
-               }
-               
-               my $content=$form->field('editcontent');
-               run_hooks(editcontent => sub {
-                       $content=shift->(
-                               content => $content,
-                               page => $page,
-                               cgi => $q,
-                               session => $session,
-                       );
-               });
-               $content=~s/\r\n/\n/g;
-               $content=~s/\r/\n/g;
-               $content.="\n" if $content !~ /\n$/;
-
-               $config{cgi}=0; # avoid cgi error message
-               eval { writefile($file, $config{srcdir}, $content) };
-               $config{cgi}=1;
-               if ($@) {
-                       $form->field(name => "rcsinfo", value => rcs_prepedit($file),
-                               force => 1);
-                       $form->tmpl_param("failed_save", 1);
-                       $form->tmpl_param("error_message", $@);
-                       $form->field("editcontent", value => $content, force => 1);
-                       $form->tmpl_param("page_select", 0);
-                       $form->field(name => "page", type => 'hidden');
-                       $form->field(name => "type", type => 'hidden');
-                       $form->title(sprintf(gettext("editing %s"), $page));
-                       showform($form, \@buttons, $session, $q,
-                               forcebaseurl => $baseurl);
-                       return;
-               }
-               
-               my $conflict;
-               if ($config{rcs}) {
-                       my $message="";
-                       if (defined $form->field('comments') &&
-                           length $form->field('comments')) {
-                               $message=$form->field('comments');
-                       }
-                       
-                       if (! $exists) {
-                               rcs_add($file);
-                       }

 
 

-                       # Prevent deadlock with post-commit hook by
-                       # signaling to it that it should not try to
-                       # do anything.
-                       disable_commit_hook();
-                       $conflict=rcs_commit($file, $message,
-                               $form->field("rcsinfo"),
-                               $session->param("name"), $ENV{REMOTE_ADDR});
-                       enable_commit_hook();
-                       rcs_update();
-               }
-               
-               # Refresh even if there was a conflict, since other changes
-               # may have been committed while the post-commit hook was
-               # disabled.
-               require IkiWiki::Render;
-               refresh();
-               saveindex();
-
-               if (defined $conflict) {
-                       $form->field(name => "rcsinfo", value => rcs_prepedit($file),
-                               force => 1);
-                       $form->tmpl_param("page_conflict", 1);
-                       $form->field("editcontent", value => $conflict, force => 1);
-                       $form->field("do", "edit", force => 1);
-                       $form->tmpl_param("page_select", 0);
-                       $form->field(name => "page", type => 'hidden');
-                       $form->field(name => "type", type => 'hidden');
-                       $form->title(sprintf(gettext("editing %s"), $page));
-                       showform($form, \@buttons, $session, $q,
-                               forcebaseurl => $baseurl);
-                       return;
-               }
-               else {
-                       # The trailing question mark tries to avoid broken
-                       # caches and get the most recent version of the page.
-                       redirect($q, "$config{url}/".htmlpage($page)."?updated");
-               }
+       if ($banned) {
+               $session->delete();
+               cgi_savesession($session);
+               cgi_custom_failure(
+                       $q, "403 Forbidden",
+                       gettext("You are banned."));

        }
        }

-} #}}}
+}

 
 

-sub cgi_getsession ($) { #{{{
+sub cgi_getsession ($) {

        my $q=shift;
 
        my $q=shift;
 

-       eval q{use CGI::Session};
+       eval q{use CGI::Session; use HTML::Entities};

        error($@) if $@;
        error($@) if $@;

-       CGI::Session->name("ikiwiki_session_".encode_utf8($config{wikiname}));
+       CGI::Session->name("ikiwiki_session_".encode_entities($config{wikiname}));

        
        my $oldmask=umask(077);
        
        my $oldmask=umask(077);

-       my $session = CGI::Session->new("driver:DB_File", $q,
-               { FileName => "$config{wikistatedir}/sessions.db" });
+       my $session = eval {
+               CGI::Session->new("driver:DB_File", $q,
+                       { FileName => "$config{wikistatedir}/sessions.db" })
+       };
+       if (! $session || $@) {
+               error($@." ".CGI::Session->errstr());
+       }
+       

        umask($oldmask);
 
        return $session;
        umask($oldmask);
 
        return $session;

-} #}}}
+}

 
 

-sub cgi_savesession ($) { #{{{
+# To guard against CSRF, the user's session id (sid)
+# can be stored on a form. This function will check
+# (for logged in users) that the sid on the form matches
+# the session id in the cookie.
+sub checksessionexpiry ($$) {
+       my $q=shift;
+       my $session = shift;
+
+       if (defined $session->param("name")) {
+               my $sid=$q->param('sid');
+               if (! defined $sid || $sid ne $session->id) {
+                       error(gettext("Your login session has expired."));
+               }
+       }
+}
+
+sub cgi_savesession ($) {

        my $session=shift;
 
        # Force session flush with safe umask.
        my $oldmask=umask(077);
        $session->flush;
        umask($oldmask);
        my $session=shift;
 
        # Force session flush with safe umask.
        my $oldmask=umask(077);
        $session->flush;
        umask($oldmask);

-} #}}}
+}

 
 

-sub cgi (;$$) { #{{{
+sub cgi (;$$) {

        my $q=shift;
        my $session=shift;
 
        eval q{use CGI};
        error($@) if $@;
        my $q=shift;
        my $session=shift;
 
        eval q{use CGI};
        error($@) if $@;

-       $CGI::DISABLE_UPLOADS=1;
+       $CGI::DISABLE_UPLOADS=$config{cgi_disable_uploads};

 
        if (! $q) {
                binmode(STDIN);
 
        if (! $q) {
                binmode(STDIN);


@@ -689,7 +411,7 @@ sub cgi (;$$) { #{{{
                        error("\"do\" parameter missing");
                }
        }
                        error("\"do\" parameter missing");
                }
        }

-       
+

        # Need to lock the wiki before getting a session.
        lockwiki();
        loadindex();
        # Need to lock the wiki before getting a session.
        lockwiki();
        loadindex();


@@ -708,7 +430,7 @@ sub cgi (;$$) { #{{{
                        # userinfo db.
                        if (! userinfo_get($session->param("name"), "regdate")) {
                                userinfo_setall($session->param("name"), {
                        # userinfo db.
                        if (! userinfo_get($session->param("name"), "regdate")) {
                                userinfo_setall($session->param("name"), {

-                                       email => "",
+                                       email => defined $session->param("email") ? $session->param("email") : "",

                                        password => "",
                                        regdate => time,
                                }) || error("failed adding user");
                                        password => "",
                                        regdate => time,
                                }) || error("failed adding user");


@@ -716,14 +438,8 @@ sub cgi (;$$) { #{{{
                }
        }
        
                }
        }
        

-       if (defined $session->param("name") &&
-           userinfo_get($session->param("name"), "banned")) {
-               print $q->header(-status => "403 Forbidden");
-               $session->delete();
-               print gettext("You are banned.");
-               cgi_savesession($session);
-       }
-
+       check_banned($q, $session);
+       

        run_hooks(sessioncgi => sub { shift->($q, $session) });
 
        if ($do eq 'signin') {
        run_hooks(sessioncgi => sub { shift->($q, $session) });
 
        if ($do eq 'signin') {


@@ -733,15 +449,25 @@ sub cgi (;$$) { #{{{
        elsif ($do eq 'prefs') {
                cgi_prefs($q, $session);
        }
        elsif ($do eq 'prefs') {
                cgi_prefs($q, $session);
        }

-       elsif ($do eq 'create' || $do eq 'edit') {
-               cgi_editpage($q, $session);
-       }

        elsif (defined $session->param("postsignin") || $do eq 'postsignin') {
                cgi_postsignin($q, $session);
        }
        else {
                error("unknown do parameter");
        }
        elsif (defined $session->param("postsignin") || $do eq 'postsignin') {
                cgi_postsignin($q, $session);
        }
        else {
                error("unknown do parameter");
        }

-} #}}}
+}
+
+# Does not need to be called directly; all errors will go through here.
+sub cgierror ($) {
+       my $message=shift;
+
+       eval q{use HTML::Entities};
+       $message = encode_entities($message);
+
+       print "Content-type: text/html\n\n";
+       print cgitemplate(undef, gettext("Error"),
+               "<p class=\"error\">".gettext("Error").": $message</p>");
+       die $@;
+}

 
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