connect: reject paths that look like command line options

If we get a repo path like "-repo.git", we may try to invoke
"git-upload-pack -repo.git". This is going to fail, since
upload-pack will interpret it as a set of bogus options. But
let's reject this before we even run the sub-program, since
we would not want to allow any mischief with repo names that
actually are real command-line options.

You can still ask for such a path via git-daemon, but there's no
security problem there, because git-daemon enters the repo itself
and then passes "."  on the command line.

Signed-off-by: Jeff King <peff@peff.net>
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

2 files changed, 37 insertions, 0 deletions

diff --git a/t/t5810-proto-disable-local.sh b/t/t5810-proto-disable-local.sh
index 563592d..c1ef99b 100755
--- a/t/t5810-proto-disable-local.sh
+++ b/t/t5810-proto-disable-local.sh
@@ -11,4 +11,27 @@ test_expect_success 'setup repository to clone' '
 test_proto "file://" file "file://$PWD"
 test_proto "path" file .
 
+test_expect_success 'setup repo with dash' '
+	git init --bare repo.git &&
+	git push repo.git HEAD &&
+	mv repo.git "$PWD/-repo.git"
+'
+
+# This will fail even without our rejection because upload-pack will
+# complain about the bogus option. So let's make sure that GIT_TRACE
+# doesn't show us even running upload-pack.
+#
+# We must also be sure to use "fetch" and not "clone" here, as the latter
+# actually canonicalizes our input into an absolute path (which is fine
+# to allow).
+test_expect_success 'repo names starting with dash are rejected' '
+	rm -f trace.out &&
+	test_must_fail env GIT_TRACE="$PWD/trace.out" git fetch -- -repo.git &&
+	! grep upload-pack trace.out
+'
+
+test_expect_success 'full paths still work' '
+	git fetch "$PWD/-repo.git"
+'
+
 test_done
diff --git a/t/t5813-proto-disable-ssh.sh b/t/t5813-proto-disable-ssh.sh
index 0ecdcee..3f084ee 100755
--- a/t/t5813-proto-disable-ssh.sh
+++ b/t/t5813-proto-disable-ssh.sh
@@ -26,4 +26,18 @@ test_expect_success 'hostnames starting with dash are rejected' '
 	! grep ^ssh: stderr
 '
 
+test_expect_success 'setup repo with dash' '
+	git init --bare remote/-repo.git &&
+	git push remote/-repo.git HEAD
+'
+
+test_expect_success 'repo names starting with dash are rejected' '
+	test_must_fail git clone remote:-repo.git dash-path 2>stderr &&
+	! grep ^ssh: stderr
+'
+
+test_expect_success 'full paths still work' '
+	git clone "remote:$PWD/remote/-repo.git" dash-path
+'
+
 test_done