add CVE

[git.ikiwiki.info.git] / ikiwiki-mass-rebuild

diff --git a/ikiwiki-mass-rebuild b/ikiwiki-mass-rebuild
index 1ec90b3c0d34e05dd6092e542523e0bf6d81646a..f13033e7f821d7cbae3a7c761147aa27dedf2b45 100755 (executable)
--- a/ikiwiki-mass-rebuild
+++ b/ikiwiki-mass-rebuild
@@ -2,6 +2,36 @@
 use warnings;
 use strict;
 
+sub supplemental_groups {
+       my $user=shift;
+
+       my @list;
+       while (my @fields=getgrent()) {
+               if (grep { $_ eq $user } split(' ', $fields[3])) {
+                       push @list, $fields[2];
+               }
+       }
+
+       return @list;
+}
+
+sub samelists {
+       my %a=map { $_ => 1 } split(' ', shift());
+       my %b=map { $_ => 1 } split(' ', shift());
+
+       foreach my $i (keys %b) {
+               if (! exists $a{$i}) {
+                       return 0;
+               }
+       }
+       foreach my $i (keys %a) {
+               if (! exists $b{$i}) {
+                       return 0;
+               }
+       }
+       return 1;
+}
+
 sub processline {
        my $user=shift;
        my $setup=shift;
@@ -20,11 +50,14 @@ sub processline {
        defined(my $pid = fork) or die "Can’t fork: $!";
        if (! $pid) {
                my ($uuid, $ugid) = (getpwnam($user))[2, 3];
-               $)="$ugid $ugid";
+               my $grouplist=join(" ", $ugid, sort {$a <=> $b} $ugid, supplemental_groups($user));
+               if (! samelists(($)=$grouplist), $grouplist)) {
+                       die "failed to set egid $grouplist (got back $))";
+               }
                $(=$ugid;
                $<=$uuid;
                $>=$uuid;
-               if ($< != $uuid || $> != $uuid || $( != $ugid || $) ne "$ugid $ugid") {
+               if ($< != $uuid || $> != $uuid || $( != $ugid) {
                        die "failed to drop permissions to $user";
                }
                %ENV=(