From b913a7056cf3aca103c8a1a840db6548d8a5462c Mon Sep 17 00:00:00 2001
From: Brendan Forster <github@brendanforster.com>
Date: Tue, 23 Jan 2018 13:20:55 +1100
Subject: [PATCH] http: add support for disabling SSL revocation checks in cURL
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This adds support for a new http.schannelCheckRevoke config value.

This config value is only used if http.sslBackend is set to "schannel",
which forces cURL to use the Windows Certificate Store when validating
server certificates associated with a remote server.

This config value should only be set to "false" if you are in an
environment where revocation checks are blocked by the network, with
no alternative options.

This is only supported in cURL 7.44 or later.

Note: an earlier iteration tried to use the config setting
http.schannel.checkRevoke, but the http.* config settings can be limited
to specific URLs via http.<url>.* (which would mistake `schannel` for a
URL).

Helped by Agustín Martín Barbero.

Signed-off-by: Brendan Forster <github@brendanforster.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 Documentation/config.txt |  8 ++++++++
 http.c                   | 17 +++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/Documentation/config.txt b/Documentation/config.txt
index c569e72859..e107f4c1e2 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -2241,6 +2241,14 @@ http.sslBackend::
 	This option is ignored if cURL lacks support for choosing the SSL
 	backend at runtime.
 
+http.schannelCheckRevoke::
+	Used to enforce or disable certificate revocation checks in cURL
+	when http.sslBackend is set to "schannel". Defaults to `true` if
+	unset. Only necessary to disable this if Git consistently errors
+	and the message is about checking the revocation status of a
+	certificate. This option is ignored if cURL lacks support for
+	setting the relevant SSL option at runtime.
+
 http.pinnedpubkey::
 	Public key of the https service. It may either be the filename of
 	a PEM or DER encoded public key file or a string starting with
diff --git a/http.c b/http.c
index fedfb2a207..2ce2cd447b 100644
--- a/http.c
+++ b/http.c
@@ -157,6 +157,8 @@ static char *cached_accept_language;
 
 static char *http_ssl_backend;
 
+static int http_schannel_check_revoke = 1;
+
 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 {
 	size_t size = eltsize * nmemb;
@@ -310,6 +312,11 @@ static int http_options(const char *var, const char *value, void *cb)
 		return 0;
 	}
 
+	if (!strcmp("http.schannelcheckrevoke", var)) {
+		http_schannel_check_revoke = git_config_bool(var, value);
+		return 0;
+	}
+
 	if (!strcmp("http.minsessions", var)) {
 		min_curl_sessions = git_config_int(var, value);
 #ifndef USE_CURL_MULTI
@@ -811,6 +818,16 @@ static CURL *get_curl_handle(void)
 	}
 #endif
 
+	if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
+	    !http_schannel_check_revoke) {
+#if LIBCURL_VERSION_NUM >= 0x072c00
+		curl_easy_setopt(result, CURLOPT_SSL_OPTIONS, CURLSSLOPT_NO_REVOKE);
+#else
+		warning("CURLSSLOPT_NO_REVOKE not applied to curl SSL options because\n"
+			"your curl version is too old (>= 7.44.0)");
+#endif
+	}
+
 	if (http_proactive_auth)
 		init_curl_http_auth(result);