From 80c3a95a95ed268905fa87a398748f94628eed44 Mon Sep 17 00:00:00 2001
From: Guilhem Moulin <guilhem@fripost.org>
Date: Wed, 28 Jun 2017 21:26:00 +0200
Subject: new-cert: use File::Temp for the temporary cert filename.

This ensures we aren't overwritting existing /path/to/srv.pem.new files.
---
 lacme | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/lacme b/lacme
index b4d09e8..fd90d1e 100755
--- a/lacme
+++ b/lacme
@@ -604,14 +604,19 @@ sub spawn($@) {
 #############################################################################
 # Install the certificate
 #
-sub install_cert($$@) {
+sub install_cert($$;$) {
     my $filename = shift;
     my $x509 = shift;
-    my @chain = @_;
+    my @chain = grep !/\A\s*\z/, @_; # ignore empty CAfile
+
+    my ($dirname, $basename) =
+        $filename =~ /\A(.*)\/([^\/]+)\z/ ? ($1, $2) : ('.', $filename);
+    my $fh = File::Temp::->new(UNLINK => 0, DIR => $dirname,
+                               TEMPLATE => "$basename.XXXXXX") // die;
 
-    my $tmp = "$filename.new";
-    open my $fh, '>', $tmp or die "Can't open $tmp: $!";
     eval {
+        my $umask = umask() // die "umask: $!";
+        chmod(0644 &~ $umask, $fh) or die "chmod: $!";
         $fh->print($x509) or die "Can't print: $!";
         foreach (@chain) { # append the chain
             open my $fh2, '<', $_ or die "Can't open $_: $!";
@@ -621,11 +626,13 @@ sub install_cert($$@) {
         }
         $fh->close() or die "Can't close: $!";
     };
+    my $path = $fh->filename();
     if ($@) {
-        unlink $tmp or warn "Can't unlink $tmp: $!";
+        print STDERR "Unlinking $path\n" if $OPTS{debug};
+        unlink $path or warn "Can't unlink $path: $!";
         die $@;
     }
-    rename($tmp, $filename) or die "Can't rename $tmp to $filename: $!";
+    rename($path, $filename) or die "Can't rename $path to $filename: $!";
 }
 
 
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