url: add CURLOPT_SSL_VERIFYSTATUS option

This option can be used to enable/disable certificate status verification using
the "Certificate Status Request" TLS extension defined in RFC6066 section 8.

This also adds the CURLE_SSL_INVALIDCERTSTATUS error, to be used when the
certificate status verification fails, and the Curl_ssl_cert_status_request()
function, used to check whether the SSL backend supports the status_request
extension.

2 files changed, 55 insertions, 0 deletions

diff --git a/docs/libcurl/opts/CURLOPT_SSL_VERIFYSTATUS.3 b/docs/libcurl/opts/CURLOPT_SSL_VERIFYSTATUS.3
new file mode 100644
index 000000000..d5217cb33
--- /dev/null
+++ b/docs/libcurl/opts/CURLOPT_SSL_VERIFYSTATUS.3
@@ -0,0 +1,53 @@
+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at http://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_SSL_VERIFYSTATUS 3 "04 Dec 2014" "libcurl 7.40.0" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_SSL_VERIFYSTATUS \- verify the certificate's status
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_VERIFYSTATUS, long verify);
+.SH DESCRIPTION
+Pass a long as parameter to enable or disable.
+
+This option determines whether libcurl verifies the status of the server cert
+using the "Certificate Status Request" TLS extension (aka. OCSP stapling).
+
+Note that if this option is enabled but the server does not support the TLS
+extension, the verification will fail.
+
+.SH DEFAULT
+0
+.SH PROTOCOLS
+All TLS based protocols: HTTPS, FTPS, IMAPS, POP3, SMTPS etc.
+.SH EXAMPLE
+TODO
+.SH AVAILABILITY
+This is currently only supported by the GnuTLS and NSS TLS backends.
+.SH RETURN VALUE
+Returns CURLE_OK if OCSP stapling is supported by the SSL backend, otherwise
+returns CURLE_NOT_BUILT_IN.
+.SH "SEE ALSO"
+.BR CURLOPT_SSL_VERIFYHOST "(3), "
+.BR CURLOPT_SSL_VERIFYPEER "(3), "
+.BR CURLOPT_CAINFO "(3), "
diff --git a/docs/libcurl/symbols-in-versions b/docs/libcurl/symbols-in-versions
index b8b0838b0..e9ef3f61c 100644
--- a/docs/libcurl/symbols-in-versions
+++ b/docs/libcurl/symbols-in-versions
@@ -118,6 +118,7 @@ CURLE_SSL_CRL_BADFILE           7.19.0
 CURLE_SSL_ENGINE_INITFAILED     7.12.3
 CURLE_SSL_ENGINE_NOTFOUND       7.9.3
 CURLE_SSL_ENGINE_SETFAILED      7.9.3
+CURLE_SSL_INVALIDCERTSTATUS     7.41.0
 CURLE_SSL_ISSUER_ERROR          7.19.0
 CURLE_SSL_PEER_CERTIFICATE      7.8           7.17.1
 CURLE_SSL_PINNEDPUBKEYNOTMATCH  7.39.0
@@ -513,6 +514,7 @@ CURLOPT_SSL_OPTIONS             7.25.0
 CURLOPT_SSL_SESSIONID_CACHE     7.16.0
 CURLOPT_SSL_VERIFYHOST          7.8.1
 CURLOPT_SSL_VERIFYPEER          7.4.2
+CURLOPT_SSL_VERIFYSTATUS        7.41.0
 CURLOPT_STDERR                  7.1
 CURLOPT_TCP_KEEPALIVE           7.25.0
 CURLOPT_TCP_KEEPIDLE            7.25.0