IkiWiki/Receive.pm

   1 #!/usr/bin/perl
   2
   3 package IkiWiki::Receive;
   4
   5 use warnings;
   6 use strict;
   7 use IkiWiki;
   8
   9 sub getuser () {
  10         my $user=(getpwuid(exists $ENV{CALLER_UID} ? $ENV{CALLER_UID} : $<))[0];
  11         if (! defined $user) {
  12                 error("cannot determine username for $<");
  13         }
  14         return $user;
  15 }
  16
  17 sub trusted () {
  18         my $user=getuser();
  19         return ! ref $config{untrusted_committers} ||
  20                 ! grep { $_ eq $user } @{$config{untrusted_committers}};
  21 }
  22
  23 sub gen_wrapper () {
  24         # Test for commits from untrusted committers in the wrapper, to
  25         # avoid loading ikiwiki at all for trusted commits.
  26
  27         my $ret=<<"EOF";
  28         {
  29                 int u=getuid();
  30 EOF
  31         $ret.="\t\tif ( ".
  32                 join("&&", map {
  33                         my $uid=getpwnam($_);
  34                         if (! defined $uid) {
  35                                 error(sprintf(gettext("cannot determine id of untrusted committer %s"), $_));
  36                         }
  37                         "u != $uid";
  38                 } @{$config{untrusted_committers}}).
  39                 ") exit(0);\n";
  40         $ret.=<<"EOF";
  41                 asprintf(&s, "CALLER_UID=%i", u);
  42                 newenviron[i++]=s;
  43         }
  44 EOF
  45         return $ret;
  46 }
  47
  48 sub test () {
  49         exit 0 if trusted();
  50
  51         IkiWiki::lockwiki();
  52         IkiWiki::loadindex();
  53
  54         # Dummy up a cgi environment to use when calling check_canedit
  55         # and friends.
  56         eval q{use CGI};
  57         error($@) if $@;
  58         my $cgi=CGI->new;
  59         $ENV{REMOTE_ADDR}='unknown' unless exists $ENV{REMOTE_ADDR};
  60
  61         # And dummy up a session object.
  62         require IkiWiki::CGI;
  63         my $session=IkiWiki::cgi_getsession($cgi);
  64         $session->param("name", getuser());
  65         # Make sure whatever user was authed is in the
  66         # userinfo db.
  67         require IkiWiki::UserInfo;
  68         if (! IkiWiki::userinfo_get($session->param("name"), "regdate")) {
  69                 IkiWiki::userinfo_setall($session->param("name"), {
  70                         email => "",
  71                         password => "",
  72                         regdate => time,
  73                 }) || error("failed adding user");
  74         }
  75
  76         my %newfiles;
  77
  78         foreach my $change (IkiWiki::rcs_receive()) {
  79                 # This untaint is safe because we check file_pruned and
  80                 # wiki_file_regexp.
  81                 my ($file)=$change->{file}=~/$config{wiki_file_regexp}/;
  82                 $file=IkiWiki::possibly_foolish_untaint($file);
  83                 if (! defined $file || ! length $file ||
  84                     IkiWiki::file_pruned($file, $config{srcdir})) {
  85                         error(gettext("bad file name %s"), $file);
  86                 }
  87
  88                 my $type=pagetype($file);
  89                 my $page=pagename($file) if defined $type;
  90
  91                 if ($change->{action} eq 'add') {
  92                         $newfiles{$file}=1;
  93                 }
  94
  95                 if ($change->{action} eq 'change' ||
  96                     $change->{action} eq 'add') {
  97                         if (defined $page) {
  98                                 if (IkiWiki->can("check_canedit")) {
  99                                         IkiWiki::check_canedit($page, $cgi, $session);
 100                                         next;
 101                                 }
 102                         }
 103                         else {
 104                                 if (IkiWiki::Plugin::attachment->can("check_canattach")) {
 105                                         IkiWiki::Plugin::attachment::check_canattach($session, $file, $change->{path});
 106                                         next;
 107                                 }
 108                         }
 109                 }
 110                 elsif ($change->{action} eq 'remove') {
 111                         # check_canremove tests to see if the file is present
 112                         # on disk. This will fail is a single commit adds a
 113                         # file and then removes it again. Avoid the problem
 114                         # by not testing the removal in such pairs of changes.
 115                         # (The add is still tested, just to make sure that
 116                         # no data is added to the repo that a web edit
 117                         # could add.)
 118                         next if $newfiles{$file};
 119
 120                         if (IkiWiki::Plugin::remove->can("check_canremove")) {
 121                                 IkiWiki::Plugin::remove::check_canremove(defined $page ? $page : $file, $cgi, $session);
 122                                 next;
 123                         }
 124                 }
 125                 else {
 126                         error "unknown action ".$change->{action};
 127                 }
 128
 129                 error sprintf(gettext("you are not allowed to change %s"), $file);
 130         }
 131
 132         exit 0;
 133 }
 134
 135 1