IkiWiki/Receive.pm

   1 #!/usr/bin/perl
   2 package IkiWiki::Receive;
   3
   4 use warnings;
   5 use strict;
   6 use IkiWiki;
   7
   8 sub getuser () {
   9         my $user=(getpwuid(exists $ENV{CALLER_UID} ? $ENV{CALLER_UID} : $<))[0];
  10         if (! defined $user) {
  11                 error("cannot determine username for $<");
  12         }
  13         return $user;
  14 }
  15
  16 sub trusted () {
  17         my $user=getuser();
  18         return ! ref $config{untrusted_committers} ||
  19                 ! grep { $_ eq $user } @{$config{untrusted_committers}};
  20 }
  21
  22 sub genwrapper () {
  23         # Test for commits from untrusted committers in the wrapper, to
  24         # avoid starting ikiwiki proper at all for trusted commits.
  25
  26         my $ret=<<"EOF";
  27         {
  28                 int u=getuid();
  29 EOF
  30         $ret.="\t\tif ( ".
  31                 join("&&", map {
  32                         my $uid=getpwnam($_);
  33                         if (! defined $uid) {
  34                                 error(sprintf(gettext("cannot determine id of untrusted committer %s"), $_));
  35                         }
  36                         "u != $uid";
  37                 } @{$config{untrusted_committers}}).
  38                 ") exit(0);\n";
  39
  40
  41         $ret.=<<"EOF";
  42                 asprintf(&s, "CALLER_UID=%i", u);
  43                 newenviron[i++]=s;
  44         }
  45 EOF
  46         return $ret;
  47 }
  48
  49 sub test () {
  50         exit 0 if trusted();
  51
  52         IkiWiki::lockwiki();
  53         IkiWiki::loadindex();
  54
  55         # Dummy up a cgi environment to use when calling check_canedit
  56         # and friends.
  57         eval q{use CGI};
  58         error($@) if $@;
  59         my $cgi=CGI->new;
  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)) {
  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 $page) {
  98                                 IkiWiki::check_canedit($page, $cgi, $session);
  99                                 next;
 100                         }
 101                         else {
 102                                 if (IkiWiki::Plugin::attachment->can("check_canattach")) {
 103                                         IkiWiki::Plugin::attachment::check_canattach($session, $file, $change->{path});
 104                                         IkiWiki::check_canedit($file, $cgi, $session);
 105                                         next;
 106                                 }
 107                         }
 108                 }
 109                 elsif ($change->{action} eq 'remove') {
 110                         # check_canremove tests to see if the file is present
 111                         # on disk. This will fail when a single commit adds a
 112                         # file and then removes it again. Avoid the problem
 113                         # by not testing the removal in such pairs of changes.
 114                         # (The add is still tested, just to make sure that
 115                         # no data is added to the repo that a web edit
 116                         # could not add.)
 117                         next if $newfiles{$file};
 118
 119                         if (IkiWiki::Plugin::remove->can("check_canremove")) {
 120                                 IkiWiki::Plugin::remove::check_canremove(defined $page ? $page : $file, $cgi, $session);
 121                                 IkiWiki::check_canedit(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