From b258116462399b318c86165c61a5c7123043cfd4 Mon Sep 17 00:00:00 2001
From: Blake Burkhart <bburky@bburky.com>
Date: Tue, 22 Sep 2015 18:06:20 -0400
Subject: [PATCH] http: limit redirection depth

By default, libcurl will follow circular http redirects
forever. Let's put a cap on this so that somebody who can
trigger an automated fetch of an arbitrary repository (e.g.,
for CI) cannot convince git to loop infinitely.

The value chosen is 20, which is the same default that
Firefox uses.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 http.c                        | 1 +
 t/lib-httpd/apache.conf       | 3 +++
 t/t5812-proto-disable-http.sh | 4 ++++
 3 files changed, 8 insertions(+)

diff --git a/http.c b/http.c
index 5a57bccea9e..00e3fc80e81 100644
--- a/http.c
+++ b/http.c
@@ -352,6 +352,7 @@ static CURL *get_curl_handle(void)
 	}
 
 	curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
+	curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
 #if LIBCURL_VERSION_NUM >= 0x071301
 	curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 #elif LIBCURL_VERSION_NUM >= 0x071101
diff --git a/t/lib-httpd/apache.conf b/t/lib-httpd/apache.conf
index 68ef8adb8e2..7d15e6d44c8 100644
--- a/t/lib-httpd/apache.conf
+++ b/t/lib-httpd/apache.conf
@@ -121,6 +121,9 @@ RewriteRule ^/smart-redir-auth/(.*)$ /auth/smart/$1 [R=301]
 RewriteRule ^/smart-redir-limited/(.*)/info/refs$ /smart/$1/info/refs [R=301]
 RewriteRule ^/ftp-redir/(.*)$ ftp://localhost:1000/$1 [R=302]
 
+RewriteRule ^/loop-redir/x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-(.*) /$1 [R=302]
+RewriteRule ^/loop-redir/(.*)$ /loop-redir/x-$1 [R=302]
+
 <IfDefine SSL>
 LoadModule ssl_module modules/mod_ssl.so
 
diff --git a/t/t5812-proto-disable-http.sh b/t/t5812-proto-disable-http.sh
index 6a4f81662d8..0d105d54174 100755
--- a/t/t5812-proto-disable-http.sh
+++ b/t/t5812-proto-disable-http.sh
@@ -25,5 +25,9 @@ test_expect_success 'curl redirects respect whitelist' '
 	}
 '
 
+test_expect_success 'curl limits redirects' '
+	test_must_fail git clone "$HTTPD_URL/loop-redir/smart/repo.git"
+'
+
 stop_httpd
 test_done