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schannel: Disable ALPN on Windows < 8.1

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Calling QueryContextAttributes with SECPKG_ATTR_APPLICATION_PROTOCOL
fails on Windows < 8.1 so we need to disable ALPN on these OS versions.

Inspiration provide by: Daniel Seither

Closes #848
Fixes #840
This commit is contained in:
Steve Holme 2016-06-06 20:53:30 +01:00
parent 84a48e5732
commit 34855feeb4
1 changed files with 13 additions and 4 deletions
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17
lib/vtls/schannel.c
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@ -64,8 +64,11 @@
#include "curl_memory.h"
#include "memdebug.h"
/* ALPN requires version 8.1 of the Windows SDK, which was
shipped with Visual Studio 2013, aka _MSC_VER 1800*/
/* ALPN requires version 8.1 of the Windows SDK, which was
shipped with Visual Studio 2013, aka _MSC_VER 1800:
https://technet.microsoft.com/en-us/library/hh831771%28v=ws.11%29.aspx
*/
#if defined(_MSC_VER) && (_MSC_VER >= 1800) && !defined(_USING_V110_SDK71_)
# define HAS_ALPN 1
#endif
@ -245,7 +248,10 @@ schannel_connect_step1(struct connectdata *conn, int sockindex)
}
#ifdef HAS_ALPN
if(conn->bits.tls_enable_alpn) {
/* ALPN is only supported on Windows 8.1 / Server 2012 R2 and above */
if(conn->bits.tls_enable_alpn &&
Curl_verify_windows_version(6, 3, PLATFORM_WINNT,
VERSION_GREATER_THAN_EQUAL)) {
int cur = 0;
int list_start_index = 0;
unsigned int* extension_len = NULL;
@ -645,7 +651,10 @@ schannel_connect_step3(struct connectdata *conn, int sockindex)
}
#ifdef HAS_ALPN
if(conn->bits.tls_enable_alpn) {
/* ALPN is only supported on Windows 8.1 / Server 2012 R2 and above */
if(conn->bits.tls_enable_alpn &&
Curl_verify_windows_version(6, 3, PLATFORM_WINNT,
VERSION_GREATER_THAN_EQUAL)) {
sspi_status = s_pSecFn->QueryContextAttributes(&connssl->ctxt->ctxt_handle,
SECPKG_ATTR_APPLICATION_PROTOCOL, &alpn_result);