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* Security: make sure the lock files used by build-remote.pl are not

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readable to other users.  Otherwise, any user can open the lock file
  for reading and lock it, thus DoSing the remote build mechanism.
This commit is contained in:
Eelco Dolstra 2011-12-21 19:11:58 +00:00
parent 69d6f0936a
commit 4d728bc3e6
1 changed files with 5 additions and 5 deletions
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8
scripts/build-remote.pl.in
View file

@ -1,6 +1,6 @@
#! @perl@ -w @perlFlags@
use Fcntl ':flock';
use Fcntl qw(:DEFAULT :flock);
use English '-no_match_vars';
use IO::Handle;
use Nix::Config;
@ -56,7 +56,7 @@ sub openSlotLock {
my ($machine, $slot) = @_;
my $slotLockFn = "$currentLoad/" . (join '+', @{$machine->{systemTypes}}) . "-" . $machine->{hostName} . "-$slot";
my $slotLock = new IO::Handle;
open $slotLock, ">>$slotLockFn" or die;
sysopen $slotLock, "$slotLockFn", O_RDWR|O_CREAT, 0600 or die;
return $slotLock;
}
@ -104,7 +104,7 @@ REQ: while (1) {
# Acquire the exclusive lock on $currentLoad/main-lock.
mkdir $currentLoad, 0777 or die unless -d $currentLoad;
my $mainLock = "$currentLoad/main-lock";
open MAINLOCK, ">>$mainLock" or die;
sysopen MAINLOCK, "$mainLock", O_RDWR|O_CREAT, 0600 or die;
flock(MAINLOCK, LOCK_EX) or die;
@ -232,7 +232,7 @@ sub removeRoots {
# the same missing path simultaneously, causing the effective network
# bandwidth and target disk speed to be divided by N.
my $uploadLock = "$currentLoad/$hostName.upload-lock";
open MAINLOCK, ">>$uploadLock" or die;
sysopen MAINLOCK, "$uploadLock", O_RDWR|O_CREAT, 0600 or die;
flock(MAINLOCK, LOCK_EX) or die;
Nix::CopyClosure::copyTo($hostName, [ @sshOpts ], [ $drvPath, @inputs ], "", "", 0, 0, $maybeSign ne "");
close MAINLOCK;