From 4890888d742e12044b1f4b89a5d10437a6371253 Mon Sep 17 00:00:00 2001
From: Frank Lichtenheld <frank@lichtenheld.de>
Date: Thu, 7 Jun 2007 16:57:00 +0200
Subject: [PATCH] cvsserver: Make req_Root more critical of its input data

The path submitted with the Root request has to be absolute
(cvs does it this way and it may save us some sanity checks
later)

If multiple roots are specified (e.g. because we use
pserver authentication which will already include the
root), ensure that they say all the same.

Probably neither is a security risk, and neither should ever
be triggered by a sane client, but when validating
input data, it's better to be save than sorry.

Signed-off-by: Frank Lichtenheld <frank@lichtenheld.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 git-cvsserver.perl              | 11 +++++++++++
 t/t9400-git-cvsserver-server.sh | 34 +++++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+)

diff --git a/git-cvsserver.perl b/git-cvsserver.perl
index 2b4825a8e..d41b29f30 100755
--- a/git-cvsserver.perl
+++ b/git-cvsserver.perl
@@ -167,6 +167,17 @@ sub req_Root
     my ( $cmd, $data ) = @_;
     $log->debug("req_Root : $data");
 
+    unless ($data =~ m#^/#) {
+	print "error 1 Root must be an absolute pathname\n";
+	return 0;
+    }
+
+    if ($state->{CVSROOT}
+	&& ($state->{CVSROOT} ne $data)) {
+	print "error 1 Conflicting roots specified\n";
+	return 0;
+    }
+
     $state->{CVSROOT} = $data;
 
     $ENV{GIT_DIR} = $state->{CVSROOT} . "/";
diff --git a/t/t9400-git-cvsserver-server.sh b/t/t9400-git-cvsserver-server.sh
index e9ef31517..41dcf646d 100755
--- a/t/t9400-git-cvsserver-server.sh
+++ b/t/t9400-git-cvsserver-server.sh
@@ -110,6 +110,40 @@ test_expect_success 'pserver authentication failure (login/non-anonymous user)'
    tail -n1 log | grep -q "^I HATE YOU$"'
 
 
+# misuse pserver authentication for testing of req_Root
+
+cat >request-relative  <<EOF
+BEGIN AUTH REQUEST
+gitcvs.git
+anonymous
+
+END AUTH REQUEST
+EOF
+
+cat >request-conflict  <<EOF
+BEGIN AUTH REQUEST
+$SERVERDIR
+anonymous
+
+END AUTH REQUEST
+Root $WORKDIR
+EOF
+
+test_expect_success 'req_Root failure (relative pathname)' \
+  'if cat request-relative | git-cvsserver pserver >log 2>&1
+   then
+       echo unexpected success
+       false
+   else
+       true
+   fi &&
+   tail log | grep -q "^error 1 Root must be an absolute pathname$"'
+
+test_expect_success 'req_Root failure (conflicting roots)' \
+  'cat request-conflict | git-cvsserver pserver >log 2>&1 &&
+   tail log | grep -q "^error 1 Conflicting roots specified$"'
+
+
 #--------------
 # CONFIG TESTS
 #--------------
-- 
2.26.2