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From 2d22150270739cd29d0ac6bc329e0a2e2910d7d9 Mon Sep 17 00:00:00 2001
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From: Petr Stodulka <pstodulk@redhat.com>
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Date: Fri, 23 Oct 2015 17:36:57 +0200
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Subject: [PATCH 4/5] http-limit-redirection-to-protocol-whitelist
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Previously, libcurl would follow redirection to any protocol
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it was compiled for support with. This is desirable to allow
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redirection from HTTP to HTTPS. However, it would even
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successfully allow redirection from HTTP to SFTP, a protocol
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that git does not otherwise support at all. Furthermore
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git's new protocol-whitelisting could be bypassed by
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following a redirect within the remote helper, as it was
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only enforced at transport selection time.
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This patch limits redirects within libcurl to HTTP, HTTPS,
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FTP and FTPS. If there is a protocol-whitelist present, this
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list is limited to those also allowed by the whitelist. As
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redirection happens from within libcurl, it is impossible
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for an HTTP redirect to a protocol implemented within
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another remote helper.
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When the curl version git was compiled with is too old to
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support restrictions on protocol redirection, we warn the
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user if GIT_ALLOW_PROTOCOL restrictions were requested. This
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is a little inaccurate, as even without that variable in the
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environment, we would still restrict SFTP, etc, and we do
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not warn in that case. But anything else means we would
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literally warn every time git accesses an http remote.
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---
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http.c | 17 +++++++++++++++++
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1 file changed, 17 insertions(+)
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diff --git a/http.c b/http.c
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index 92aba59..235c2d5 100644
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--- a/http.c
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+++ b/http.c
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@@ -6,6 +6,7 @@
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#include "credential.h"
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#include "version.h"
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#include "pkt-line.h"
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+#include "transport.h"
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int active_requests;
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int http_is_verbose;
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@@ -252,6 +253,7 @@ static int has_cert_password(void)
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static CURL *get_curl_handle(void)
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{
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CURL *result = curl_easy_init();
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+ long allowed_protocols = 0;
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if (!curl_ssl_verify) {
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curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
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@@ -301,6 +303,21 @@ static CURL *get_curl_handle(void)
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#elif LIBCURL_VERSION_NUM >= 0x071101
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curl_easy_setopt(result, CURLOPT_POST301, 1);
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#endif
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+#if LIBCURL_VERSION_NUM >= 0x071304
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+ if (is_transport_allowed("http"))
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+ allowed_protocols |= CURLPROTO_HTTP;
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+ if (is_transport_allowed("https"))
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+ allowed_protocols |= CURLPROTO_HTTPS;
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+ if (is_transport_allowed("ftp"))
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+ allowed_protocols |= CURLPROTO_FTP;
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+ if (is_transport_allowed("ftps"))
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+ allowed_protocols |= CURLPROTO_FTPS;
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+ curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
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+#else
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+ if (transport_restrict_protocols())
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+ warning("protocol restrictions not applied to curl redirects because\n"
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+ "your curl version is too old (>= 7.19.4)");
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+#endif
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if (getenv("GIT_CURL_VERBOSE"))
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curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
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--
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2.1.0
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