mirror of
https://github.com/moparisthebest/curl
synced 2024-12-22 16:18:48 -05:00
1624 lines
56 KiB
C
1624 lines
56 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 2012 - 2016, Marc Hoersken, <info@marc-hoersken.de>
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* Copyright (C) 2012, Mark Salisbury, <mark.salisbury@hp.com>
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* Copyright (C) 2012 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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/*
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* Source file for all SChannel-specific code for the TLS/SSL layer. No code
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* but vtls.c should ever call or use these functions.
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*
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*/
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/*
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* Based upon the PolarSSL implementation in polarssl.c and polarssl.h:
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* Copyright (C) 2010, 2011, Hoi-Ho Chan, <hoiho.chan@gmail.com>
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*
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* Based upon the CyaSSL implementation in cyassl.c and cyassl.h:
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* Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* Thanks for code and inspiration!
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*/
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#include "curl_setup.h"
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#ifdef USE_SCHANNEL
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#ifndef USE_WINDOWS_SSPI
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# error "Can't compile SCHANNEL support without SSPI."
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#endif
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#include "curl_sspi.h"
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#include "schannel.h"
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#include "vtls.h"
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#include "sendf.h"
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#include "connect.h" /* for the connect timeout */
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#include "strerror.h"
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#include "select.h" /* for the socket readyness */
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#include "inet_pton.h" /* for IP addr SNI check */
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#include "curl_multibyte.h"
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#include "warnless.h"
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#include "curl_printf.h"
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#include "curl_memory.h"
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/* The last #include file should be: */
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#include "memdebug.h"
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/* ALPN requires version 8.1 of the Windows SDK, which was
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shipped with Visual Studio 2013, aka _MSC_VER 1800*/
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#if defined(_MSC_VER) && (_MSC_VER >= 1800)
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# define HAS_ALPN 1
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#endif
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/* Uncomment to force verbose output
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* #define infof(x, y, ...) printf(y, __VA_ARGS__)
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* #define failf(x, y, ...) printf(y, __VA_ARGS__)
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*/
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static Curl_recv schannel_recv;
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static Curl_send schannel_send;
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#ifdef _WIN32_WCE
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static CURLcode verify_certificate(struct connectdata *conn, int sockindex);
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#endif
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static void InitSecBuffer(SecBuffer *buffer, unsigned long BufType,
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void *BufDataPtr, unsigned long BufByteSize)
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{
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buffer->cbBuffer = BufByteSize;
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buffer->BufferType = BufType;
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buffer->pvBuffer = BufDataPtr;
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}
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static void InitSecBufferDesc(SecBufferDesc *desc, SecBuffer *BufArr,
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unsigned long NumArrElem)
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{
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desc->ulVersion = SECBUFFER_VERSION;
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desc->pBuffers = BufArr;
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desc->cBuffers = NumArrElem;
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}
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static CURLcode
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schannel_connect_step1(struct connectdata *conn, int sockindex)
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{
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ssize_t written = -1;
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struct SessionHandle *data = conn->data;
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struct ssl_connect_data *connssl = &conn->ssl[sockindex];
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SecBuffer outbuf;
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SecBufferDesc outbuf_desc;
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SecBuffer inbuf;
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SecBufferDesc inbuf_desc;
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#ifdef HAS_ALPN
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unsigned char alpn_buffer[128];
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#endif
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SCHANNEL_CRED schannel_cred;
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SECURITY_STATUS sspi_status = SEC_E_OK;
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struct curl_schannel_cred *old_cred = NULL;
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struct in_addr addr;
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#ifdef ENABLE_IPV6
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struct in6_addr addr6;
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#endif
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TCHAR *host_name;
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CURLcode result;
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infof(data, "schannel: SSL/TLS connection with %s port %hu (step 1/3)\n",
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conn->host.name, conn->remote_port);
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/* check for an existing re-usable credential handle */
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if(!Curl_ssl_getsessionid(conn, (void **)&old_cred, NULL)) {
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connssl->cred = old_cred;
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infof(data, "schannel: re-using existing credential handle\n");
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}
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else {
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/* setup Schannel API options */
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memset(&schannel_cred, 0, sizeof(schannel_cred));
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schannel_cred.dwVersion = SCHANNEL_CRED_VERSION;
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if(data->set.ssl.verifypeer) {
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#ifdef _WIN32_WCE
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/* certificate validation on CE doesn't seem to work right; we'll
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do it following a more manual process. */
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schannel_cred.dwFlags = SCH_CRED_MANUAL_CRED_VALIDATION |
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SCH_CRED_IGNORE_NO_REVOCATION_CHECK |
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SCH_CRED_IGNORE_REVOCATION_OFFLINE;
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#else
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schannel_cred.dwFlags = SCH_CRED_AUTO_CRED_VALIDATION;
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if(data->set.ssl_no_revoke)
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schannel_cred.dwFlags |= SCH_CRED_IGNORE_NO_REVOCATION_CHECK |
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SCH_CRED_IGNORE_REVOCATION_OFFLINE;
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else
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schannel_cred.dwFlags |= SCH_CRED_REVOCATION_CHECK_CHAIN;
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#endif
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if(data->set.ssl_no_revoke)
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infof(data, "schannel: disabled server certificate revocation "
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"checks\n");
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else
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infof(data, "schannel: checking server certificate revocation\n");
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}
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else {
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schannel_cred.dwFlags = SCH_CRED_MANUAL_CRED_VALIDATION |
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SCH_CRED_IGNORE_NO_REVOCATION_CHECK |
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SCH_CRED_IGNORE_REVOCATION_OFFLINE;
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infof(data, "schannel: disabled server certificate revocation checks\n");
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}
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if(!data->set.ssl.verifyhost) {
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schannel_cred.dwFlags |= SCH_CRED_NO_SERVERNAME_CHECK;
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infof(data, "schannel: verifyhost setting prevents Schannel from "
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"comparing the supplied target name with the subject "
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"names in server certificates. Also disables SNI.\n");
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}
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switch(data->set.ssl.version) {
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default:
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case CURL_SSLVERSION_DEFAULT:
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case CURL_SSLVERSION_TLSv1:
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schannel_cred.grbitEnabledProtocols = SP_PROT_TLS1_0_CLIENT |
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SP_PROT_TLS1_1_CLIENT |
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SP_PROT_TLS1_2_CLIENT;
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break;
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case CURL_SSLVERSION_TLSv1_0:
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schannel_cred.grbitEnabledProtocols = SP_PROT_TLS1_0_CLIENT;
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break;
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case CURL_SSLVERSION_TLSv1_1:
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schannel_cred.grbitEnabledProtocols = SP_PROT_TLS1_1_CLIENT;
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break;
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case CURL_SSLVERSION_TLSv1_2:
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schannel_cred.grbitEnabledProtocols = SP_PROT_TLS1_2_CLIENT;
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break;
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case CURL_SSLVERSION_SSLv3:
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schannel_cred.grbitEnabledProtocols = SP_PROT_SSL3_CLIENT;
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break;
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case CURL_SSLVERSION_SSLv2:
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schannel_cred.grbitEnabledProtocols = SP_PROT_SSL2_CLIENT;
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break;
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}
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/* allocate memory for the re-usable credential handle */
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connssl->cred = (struct curl_schannel_cred *)
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malloc(sizeof(struct curl_schannel_cred));
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if(!connssl->cred) {
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failf(data, "schannel: unable to allocate memory");
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return CURLE_OUT_OF_MEMORY;
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}
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memset(connssl->cred, 0, sizeof(struct curl_schannel_cred));
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/* https://msdn.microsoft.com/en-us/library/windows/desktop/aa374716.aspx
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*/
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sspi_status =
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s_pSecFn->AcquireCredentialsHandle(NULL, (TCHAR *)UNISP_NAME,
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SECPKG_CRED_OUTBOUND, NULL,
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&schannel_cred, NULL, NULL,
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&connssl->cred->cred_handle,
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&connssl->cred->time_stamp);
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if(sspi_status != SEC_E_OK) {
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if(sspi_status == SEC_E_WRONG_PRINCIPAL)
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failf(data, "schannel: SNI or certificate check failed: %s",
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Curl_sspi_strerror(conn, sspi_status));
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else
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failf(data, "schannel: AcquireCredentialsHandle failed: %s",
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Curl_sspi_strerror(conn, sspi_status));
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Curl_safefree(connssl->cred);
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return CURLE_SSL_CONNECT_ERROR;
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}
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}
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/* Warn if SNI is disabled due to use of an IP address */
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if(Curl_inet_pton(AF_INET, conn->host.name, &addr)
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#ifdef ENABLE_IPV6
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|| Curl_inet_pton(AF_INET6, conn->host.name, &addr6)
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#endif
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) {
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infof(data, "schannel: using IP address, SNI is not supported by OS.\n");
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}
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#ifdef HAS_ALPN
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if(data->set.ssl_enable_alpn) {
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int cur = 0;
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int list_start_index = 0;
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unsigned int* extension_len = NULL;
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unsigned short* list_len = NULL;
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/* The first four bytes will be an unsigned int indicating number
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of bytes of data in the rest of the the buffer. */
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extension_len = (unsigned int*)(&alpn_buffer[cur]);
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cur += sizeof(unsigned int);
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/* The next four bytes are an indicator that this buffer will contain
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ALPN data, as opposed to NPN, for example. */
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*(unsigned int*)&alpn_buffer[cur] =
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SecApplicationProtocolNegotiationExt_ALPN;
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cur += sizeof(unsigned int);
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/* The next two bytes will be an unsigned short indicating the number
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of bytes used to list the preferred protocols. */
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list_len = (unsigned short*)(&alpn_buffer[cur]);
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cur += sizeof(unsigned short);
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list_start_index = cur;
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#ifdef USE_NGHTTP2
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if(data->set.httpversion >= CURL_HTTP_VERSION_2) {
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memcpy(&alpn_buffer[cur], NGHTTP2_PROTO_ALPN, NGHTTP2_PROTO_ALPN_LEN);
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cur += NGHTTP2_PROTO_ALPN_LEN;
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infof(data, "schannel: ALPN, offering %s\n", NGHTTP2_PROTO_VERSION_ID);
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}
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#endif
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alpn_buffer[cur++] = ALPN_HTTP_1_1_LENGTH;
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memcpy(&alpn_buffer[cur], ALPN_HTTP_1_1, ALPN_HTTP_1_1_LENGTH);
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cur += ALPN_HTTP_1_1_LENGTH;
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infof(data, "schannel: ALPN, offering %s\n", ALPN_HTTP_1_1);
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*list_len = curlx_uitous(cur - list_start_index);
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*extension_len = *list_len + sizeof(unsigned int) + sizeof(unsigned short);
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InitSecBuffer(&inbuf, SECBUFFER_APPLICATION_PROTOCOLS, alpn_buffer, cur);
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InitSecBufferDesc(&inbuf_desc, &inbuf, 1);
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}
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else
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{
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InitSecBuffer(&inbuf, SECBUFFER_EMPTY, NULL, 0);
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InitSecBufferDesc(&inbuf_desc, &inbuf, 1);
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}
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#else /* HAS_ALPN */
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InitSecBuffer(&inbuf, SECBUFFER_EMPTY, NULL, 0);
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InitSecBufferDesc(&inbuf_desc, &inbuf, 1);
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#endif
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/* setup output buffer */
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InitSecBuffer(&outbuf, SECBUFFER_EMPTY, NULL, 0);
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InitSecBufferDesc(&outbuf_desc, &outbuf, 1);
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/* setup request flags */
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connssl->req_flags = ISC_REQ_SEQUENCE_DETECT | ISC_REQ_REPLAY_DETECT |
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ISC_REQ_CONFIDENTIALITY | ISC_REQ_ALLOCATE_MEMORY |
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ISC_REQ_STREAM;
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/* allocate memory for the security context handle */
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connssl->ctxt = (struct curl_schannel_ctxt *)
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malloc(sizeof(struct curl_schannel_ctxt));
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if(!connssl->ctxt) {
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failf(data, "schannel: unable to allocate memory");
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return CURLE_OUT_OF_MEMORY;
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}
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memset(connssl->ctxt, 0, sizeof(struct curl_schannel_ctxt));
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host_name = Curl_convert_UTF8_to_tchar(conn->host.name);
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if(!host_name)
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return CURLE_OUT_OF_MEMORY;
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/* https://msdn.microsoft.com/en-us/library/windows/desktop/aa375924.aspx */
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sspi_status = s_pSecFn->InitializeSecurityContext(
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&connssl->cred->cred_handle, NULL, host_name,
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connssl->req_flags, 0, 0, &inbuf_desc, 0, &connssl->ctxt->ctxt_handle,
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&outbuf_desc, &connssl->ret_flags, &connssl->ctxt->time_stamp);
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Curl_unicodefree(host_name);
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if(sspi_status != SEC_I_CONTINUE_NEEDED) {
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if(sspi_status == SEC_E_WRONG_PRINCIPAL)
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failf(data, "schannel: SNI or certificate check failed: %s",
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Curl_sspi_strerror(conn, sspi_status));
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else
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failf(data, "schannel: initial InitializeSecurityContext failed: %s",
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Curl_sspi_strerror(conn, sspi_status));
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Curl_safefree(connssl->ctxt);
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return CURLE_SSL_CONNECT_ERROR;
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}
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infof(data, "schannel: sending initial handshake data: "
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"sending %lu bytes...\n", outbuf.cbBuffer);
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/* send initial handshake data which is now stored in output buffer */
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result = Curl_write_plain(conn, conn->sock[sockindex], outbuf.pvBuffer,
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outbuf.cbBuffer, &written);
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s_pSecFn->FreeContextBuffer(outbuf.pvBuffer);
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if((result != CURLE_OK) || (outbuf.cbBuffer != (size_t) written)) {
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failf(data, "schannel: failed to send initial handshake data: "
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"sent %zd of %lu bytes", written, outbuf.cbBuffer);
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return CURLE_SSL_CONNECT_ERROR;
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}
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infof(data, "schannel: sent initial handshake data: "
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"sent %zd bytes\n", written);
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connssl->recv_unrecoverable_err = CURLE_OK;
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connssl->recv_sspi_close_notify = false;
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connssl->recv_connection_closed = false;
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/* continue to second handshake step */
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connssl->connecting_state = ssl_connect_2;
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return CURLE_OK;
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}
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static CURLcode
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schannel_connect_step2(struct connectdata *conn, int sockindex)
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{
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int i;
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ssize_t nread = -1, written = -1;
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struct SessionHandle *data = conn->data;
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struct ssl_connect_data *connssl = &conn->ssl[sockindex];
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unsigned char *reallocated_buffer;
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size_t reallocated_length;
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SecBuffer outbuf[3];
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SecBufferDesc outbuf_desc;
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SecBuffer inbuf[2];
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SecBufferDesc inbuf_desc;
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SECURITY_STATUS sspi_status = SEC_E_OK;
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TCHAR *host_name;
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CURLcode result;
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bool doread;
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doread = (connssl->connecting_state != ssl_connect_2_writing) ? TRUE : FALSE;
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infof(data, "schannel: SSL/TLS connection with %s port %hu (step 2/3)\n",
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conn->host.name, conn->remote_port);
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if(!connssl->cred || !connssl->ctxt)
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return CURLE_SSL_CONNECT_ERROR;
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/* buffer to store previously received and decrypted data */
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if(connssl->decdata_buffer == NULL) {
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connssl->decdata_offset = 0;
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connssl->decdata_length = CURL_SCHANNEL_BUFFER_INIT_SIZE;
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connssl->decdata_buffer = malloc(connssl->decdata_length);
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if(connssl->decdata_buffer == NULL) {
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failf(data, "schannel: unable to allocate memory");
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return CURLE_OUT_OF_MEMORY;
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}
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}
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/* buffer to store previously received and encrypted data */
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if(connssl->encdata_buffer == NULL) {
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connssl->encdata_offset = 0;
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connssl->encdata_length = CURL_SCHANNEL_BUFFER_INIT_SIZE;
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connssl->encdata_buffer = malloc(connssl->encdata_length);
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if(connssl->encdata_buffer == NULL) {
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failf(data, "schannel: unable to allocate memory");
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return CURLE_OUT_OF_MEMORY;
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}
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}
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/* if we need a bigger buffer to read a full message, increase buffer now */
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if(connssl->encdata_length - connssl->encdata_offset <
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CURL_SCHANNEL_BUFFER_FREE_SIZE) {
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/* increase internal encrypted data buffer */
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reallocated_length = connssl->encdata_offset +
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CURL_SCHANNEL_BUFFER_FREE_SIZE;
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reallocated_buffer = realloc(connssl->encdata_buffer,
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reallocated_length);
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if(reallocated_buffer == NULL) {
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failf(data, "schannel: unable to re-allocate memory");
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return CURLE_OUT_OF_MEMORY;
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}
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else {
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connssl->encdata_buffer = reallocated_buffer;
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connssl->encdata_length = reallocated_length;
|
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}
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}
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for(;;) {
|
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if(doread) {
|
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/* read encrypted handshake data from socket */
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result = Curl_read_plain(conn->sock[sockindex],
|
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(char *) (connssl->encdata_buffer +
|
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connssl->encdata_offset),
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connssl->encdata_length -
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connssl->encdata_offset,
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&nread);
|
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if(result == CURLE_AGAIN) {
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if(connssl->connecting_state != ssl_connect_2_writing)
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connssl->connecting_state = ssl_connect_2_reading;
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infof(data, "schannel: failed to receive handshake, "
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"need more data\n");
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return CURLE_OK;
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}
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else if((result != CURLE_OK) || (nread == 0)) {
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failf(data, "schannel: failed to receive handshake, "
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"SSL/TLS connection failed");
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return CURLE_SSL_CONNECT_ERROR;
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}
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|
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/* increase encrypted data buffer offset */
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connssl->encdata_offset += nread;
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}
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infof(data, "schannel: encrypted data buffer: offset %zu length %zu\n",
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connssl->encdata_offset, connssl->encdata_length);
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|
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/* setup input buffers */
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InitSecBuffer(&inbuf[0], SECBUFFER_TOKEN, malloc(connssl->encdata_offset),
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curlx_uztoul(connssl->encdata_offset));
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InitSecBuffer(&inbuf[1], SECBUFFER_EMPTY, NULL, 0);
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InitSecBufferDesc(&inbuf_desc, inbuf, 2);
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|
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/* setup output buffers */
|
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InitSecBuffer(&outbuf[0], SECBUFFER_TOKEN, NULL, 0);
|
|
InitSecBuffer(&outbuf[1], SECBUFFER_ALERT, NULL, 0);
|
|
InitSecBuffer(&outbuf[2], SECBUFFER_EMPTY, NULL, 0);
|
|
InitSecBufferDesc(&outbuf_desc, outbuf, 3);
|
|
|
|
if(inbuf[0].pvBuffer == NULL) {
|
|
failf(data, "schannel: unable to allocate memory");
|
|
return CURLE_OUT_OF_MEMORY;
|
|
}
|
|
|
|
/* copy received handshake data into input buffer */
|
|
memcpy(inbuf[0].pvBuffer, connssl->encdata_buffer,
|
|
connssl->encdata_offset);
|
|
|
|
host_name = Curl_convert_UTF8_to_tchar(conn->host.name);
|
|
if(!host_name)
|
|
return CURLE_OUT_OF_MEMORY;
|
|
|
|
/* https://msdn.microsoft.com/en-us/library/windows/desktop/aa375924.aspx
|
|
*/
|
|
sspi_status = s_pSecFn->InitializeSecurityContext(
|
|
&connssl->cred->cred_handle, &connssl->ctxt->ctxt_handle,
|
|
host_name, connssl->req_flags, 0, 0, &inbuf_desc, 0, NULL,
|
|
&outbuf_desc, &connssl->ret_flags, &connssl->ctxt->time_stamp);
|
|
|
|
Curl_unicodefree(host_name);
|
|
|
|
/* free buffer for received handshake data */
|
|
Curl_safefree(inbuf[0].pvBuffer);
|
|
|
|
/* check if the handshake was incomplete */
|
|
if(sspi_status == SEC_E_INCOMPLETE_MESSAGE) {
|
|
connssl->connecting_state = ssl_connect_2_reading;
|
|
infof(data, "schannel: received incomplete message, need more data\n");
|
|
return CURLE_OK;
|
|
}
|
|
|
|
/* If the server has requested a client certificate, attempt to continue
|
|
the handshake without one. This will allow connections to servers which
|
|
request a client certificate but do not require it. */
|
|
if(sspi_status == SEC_I_INCOMPLETE_CREDENTIALS &&
|
|
!(connssl->req_flags & ISC_REQ_USE_SUPPLIED_CREDS)) {
|
|
connssl->req_flags |= ISC_REQ_USE_SUPPLIED_CREDS;
|
|
connssl->connecting_state = ssl_connect_2_writing;
|
|
infof(data, "schannel: a client certificate has been requested\n");
|
|
return CURLE_OK;
|
|
}
|
|
|
|
/* check if the handshake needs to be continued */
|
|
if(sspi_status == SEC_I_CONTINUE_NEEDED || sspi_status == SEC_E_OK) {
|
|
for(i = 0; i < 3; i++) {
|
|
/* search for handshake tokens that need to be send */
|
|
if(outbuf[i].BufferType == SECBUFFER_TOKEN && outbuf[i].cbBuffer > 0) {
|
|
infof(data, "schannel: sending next handshake data: "
|
|
"sending %lu bytes...\n", outbuf[i].cbBuffer);
|
|
|
|
/* send handshake token to server */
|
|
result = Curl_write_plain(conn, conn->sock[sockindex],
|
|
outbuf[i].pvBuffer, outbuf[i].cbBuffer,
|
|
&written);
|
|
if((result != CURLE_OK) ||
|
|
(outbuf[i].cbBuffer != (size_t) written)) {
|
|
failf(data, "schannel: failed to send next handshake data: "
|
|
"sent %zd of %lu bytes", written, outbuf[i].cbBuffer);
|
|
return CURLE_SSL_CONNECT_ERROR;
|
|
}
|
|
}
|
|
|
|
/* free obsolete buffer */
|
|
if(outbuf[i].pvBuffer != NULL) {
|
|
s_pSecFn->FreeContextBuffer(outbuf[i].pvBuffer);
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
if(sspi_status == SEC_E_WRONG_PRINCIPAL)
|
|
failf(data, "schannel: SNI or certificate check failed: %s",
|
|
Curl_sspi_strerror(conn, sspi_status));
|
|
else
|
|
failf(data, "schannel: next InitializeSecurityContext failed: %s",
|
|
Curl_sspi_strerror(conn, sspi_status));
|
|
return CURLE_SSL_CONNECT_ERROR;
|
|
}
|
|
|
|
/* check if there was additional remaining encrypted data */
|
|
if(inbuf[1].BufferType == SECBUFFER_EXTRA && inbuf[1].cbBuffer > 0) {
|
|
infof(data, "schannel: encrypted data length: %lu\n", inbuf[1].cbBuffer);
|
|
/*
|
|
There are two cases where we could be getting extra data here:
|
|
1) If we're renegotiating a connection and the handshake is already
|
|
complete (from the server perspective), it can encrypted app data
|
|
(not handshake data) in an extra buffer at this point.
|
|
2) (sspi_status == SEC_I_CONTINUE_NEEDED) We are negotiating a
|
|
connection and this extra data is part of the handshake.
|
|
We should process the data immediately; waiting for the socket to
|
|
be ready may fail since the server is done sending handshake data.
|
|
*/
|
|
/* check if the remaining data is less than the total amount
|
|
and therefore begins after the already processed data */
|
|
if(connssl->encdata_offset > inbuf[1].cbBuffer) {
|
|
memmove(connssl->encdata_buffer,
|
|
(connssl->encdata_buffer + connssl->encdata_offset) -
|
|
inbuf[1].cbBuffer, inbuf[1].cbBuffer);
|
|
connssl->encdata_offset = inbuf[1].cbBuffer;
|
|
if(sspi_status == SEC_I_CONTINUE_NEEDED) {
|
|
doread = FALSE;
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
connssl->encdata_offset = 0;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* check if the handshake needs to be continued */
|
|
if(sspi_status == SEC_I_CONTINUE_NEEDED) {
|
|
connssl->connecting_state = ssl_connect_2_reading;
|
|
return CURLE_OK;
|
|
}
|
|
|
|
/* check if the handshake is complete */
|
|
if(sspi_status == SEC_E_OK) {
|
|
connssl->connecting_state = ssl_connect_3;
|
|
infof(data, "schannel: SSL/TLS handshake complete\n");
|
|
}
|
|
|
|
#ifdef _WIN32_WCE
|
|
/* Windows CE doesn't do any server certificate validation.
|
|
We have to do it manually. */
|
|
if(data->set.ssl.verifypeer)
|
|
return verify_certificate(conn, sockindex);
|
|
#endif
|
|
|
|
return CURLE_OK;
|
|
}
|
|
|
|
static CURLcode
|
|
schannel_connect_step3(struct connectdata *conn, int sockindex)
|
|
{
|
|
CURLcode result = CURLE_OK;
|
|
struct SessionHandle *data = conn->data;
|
|
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
|
|
struct curl_schannel_cred *old_cred = NULL;
|
|
#ifdef HAS_ALPN
|
|
SECURITY_STATUS sspi_status = SEC_E_OK;
|
|
SecPkgContext_ApplicationProtocol alpn_result;
|
|
#endif
|
|
bool incache;
|
|
|
|
DEBUGASSERT(ssl_connect_3 == connssl->connecting_state);
|
|
|
|
infof(data, "schannel: SSL/TLS connection with %s port %hu (step 3/3)\n",
|
|
conn->host.name, conn->remote_port);
|
|
|
|
if(!connssl->cred)
|
|
return CURLE_SSL_CONNECT_ERROR;
|
|
|
|
/* check if the required context attributes are met */
|
|
if(connssl->ret_flags != connssl->req_flags) {
|
|
if(!(connssl->ret_flags & ISC_RET_SEQUENCE_DETECT))
|
|
failf(data, "schannel: failed to setup sequence detection");
|
|
if(!(connssl->ret_flags & ISC_RET_REPLAY_DETECT))
|
|
failf(data, "schannel: failed to setup replay detection");
|
|
if(!(connssl->ret_flags & ISC_RET_CONFIDENTIALITY))
|
|
failf(data, "schannel: failed to setup confidentiality");
|
|
if(!(connssl->ret_flags & ISC_RET_ALLOCATED_MEMORY))
|
|
failf(data, "schannel: failed to setup memory allocation");
|
|
if(!(connssl->ret_flags & ISC_RET_STREAM))
|
|
failf(data, "schannel: failed to setup stream orientation");
|
|
return CURLE_SSL_CONNECT_ERROR;
|
|
}
|
|
|
|
#ifdef HAS_ALPN
|
|
if(data->set.ssl_enable_alpn) {
|
|
sspi_status = s_pSecFn->QueryContextAttributes(&connssl->ctxt->ctxt_handle,
|
|
SECPKG_ATTR_APPLICATION_PROTOCOL, &alpn_result);
|
|
|
|
if(sspi_status != SEC_E_OK) {
|
|
failf(data, "schannel: failed to retrieve ALPN result");
|
|
return CURLE_SSL_CONNECT_ERROR;
|
|
}
|
|
|
|
if(alpn_result.ProtoNegoStatus ==
|
|
SecApplicationProtocolNegotiationStatus_Success) {
|
|
|
|
infof(data, "schannel: ALPN, server accepted to use %.*s\n",
|
|
alpn_result.ProtocolIdSize, alpn_result.ProtocolId);
|
|
|
|
#ifdef USE_NGHTTP2
|
|
if(alpn_result.ProtocolIdSize == NGHTTP2_PROTO_VERSION_ID_LEN &&
|
|
!memcmp(NGHTTP2_PROTO_VERSION_ID, alpn_result.ProtocolId,
|
|
NGHTTP2_PROTO_VERSION_ID_LEN)) {
|
|
conn->negnpn = CURL_HTTP_VERSION_2;
|
|
}
|
|
else
|
|
#endif
|
|
if(alpn_result.ProtocolIdSize == ALPN_HTTP_1_1_LENGTH &&
|
|
!memcmp(ALPN_HTTP_1_1, alpn_result.ProtocolId,
|
|
ALPN_HTTP_1_1_LENGTH)) {
|
|
conn->negnpn = CURL_HTTP_VERSION_1_1;
|
|
}
|
|
}
|
|
else
|
|
infof(data, "ALPN, server did not agree to a protocol\n");
|
|
}
|
|
#endif
|
|
|
|
/* increment the reference counter of the credential/session handle */
|
|
if(connssl->cred && connssl->ctxt) {
|
|
connssl->cred->refcount++;
|
|
infof(data, "schannel: incremented credential handle refcount = %d\n",
|
|
connssl->cred->refcount);
|
|
}
|
|
|
|
/* save the current session data for possible re-use */
|
|
incache = !(Curl_ssl_getsessionid(conn, (void **)&old_cred, NULL));
|
|
if(incache) {
|
|
if(old_cred != connssl->cred) {
|
|
infof(data, "schannel: old credential handle is stale, removing\n");
|
|
Curl_ssl_delsessionid(conn, (void *)old_cred);
|
|
incache = FALSE;
|
|
}
|
|
}
|
|
|
|
if(!incache) {
|
|
result = Curl_ssl_addsessionid(conn, (void *)connssl->cred,
|
|
sizeof(struct curl_schannel_cred));
|
|
if(result) {
|
|
failf(data, "schannel: failed to store credential handle");
|
|
return result;
|
|
}
|
|
else {
|
|
connssl->cred->cached = TRUE;
|
|
infof(data, "schannel: stored credential handle in session cache\n");
|
|
}
|
|
}
|
|
|
|
connssl->connecting_state = ssl_connect_done;
|
|
|
|
return CURLE_OK;
|
|
}
|
|
|
|
static CURLcode
|
|
schannel_connect_common(struct connectdata *conn, int sockindex,
|
|
bool nonblocking, bool *done)
|
|
{
|
|
CURLcode result;
|
|
struct SessionHandle *data = conn->data;
|
|
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
|
|
curl_socket_t sockfd = conn->sock[sockindex];
|
|
long timeout_ms;
|
|
int what;
|
|
|
|
/* check if the connection has already been established */
|
|
if(ssl_connection_complete == connssl->state) {
|
|
*done = TRUE;
|
|
return CURLE_OK;
|
|
}
|
|
|
|
if(ssl_connect_1 == connssl->connecting_state) {
|
|
/* check out how much more time we're allowed */
|
|
timeout_ms = Curl_timeleft(data, NULL, TRUE);
|
|
|
|
if(timeout_ms < 0) {
|
|
/* no need to continue if time already is up */
|
|
failf(data, "SSL/TLS connection timeout");
|
|
return CURLE_OPERATION_TIMEDOUT;
|
|
}
|
|
|
|
result = schannel_connect_step1(conn, sockindex);
|
|
if(result)
|
|
return result;
|
|
}
|
|
|
|
while(ssl_connect_2 == connssl->connecting_state ||
|
|
ssl_connect_2_reading == connssl->connecting_state ||
|
|
ssl_connect_2_writing == connssl->connecting_state) {
|
|
|
|
/* check out how much more time we're allowed */
|
|
timeout_ms = Curl_timeleft(data, NULL, TRUE);
|
|
|
|
if(timeout_ms < 0) {
|
|
/* no need to continue if time already is up */
|
|
failf(data, "SSL/TLS connection timeout");
|
|
return CURLE_OPERATION_TIMEDOUT;
|
|
}
|
|
|
|
/* if ssl is expecting something, check if it's available. */
|
|
if(connssl->connecting_state == ssl_connect_2_reading
|
|
|| connssl->connecting_state == ssl_connect_2_writing) {
|
|
|
|
curl_socket_t writefd = ssl_connect_2_writing ==
|
|
connssl->connecting_state ? sockfd : CURL_SOCKET_BAD;
|
|
curl_socket_t readfd = ssl_connect_2_reading ==
|
|
connssl->connecting_state ? sockfd : CURL_SOCKET_BAD;
|
|
|
|
what = Curl_socket_ready(readfd, writefd, nonblocking ? 0 : timeout_ms);
|
|
if(what < 0) {
|
|
/* fatal error */
|
|
failf(data, "select/poll on SSL/TLS socket, errno: %d", SOCKERRNO);
|
|
return CURLE_SSL_CONNECT_ERROR;
|
|
}
|
|
else if(0 == what) {
|
|
if(nonblocking) {
|
|
*done = FALSE;
|
|
return CURLE_OK;
|
|
}
|
|
else {
|
|
/* timeout */
|
|
failf(data, "SSL/TLS connection timeout");
|
|
return CURLE_OPERATION_TIMEDOUT;
|
|
}
|
|
}
|
|
/* socket is readable or writable */
|
|
}
|
|
|
|
/* Run transaction, and return to the caller if it failed or if
|
|
* this connection is part of a multi handle and this loop would
|
|
* execute again. This permits the owner of a multi handle to
|
|
* abort a connection attempt before step2 has completed while
|
|
* ensuring that a client using select() or epoll() will always
|
|
* have a valid fdset to wait on.
|
|
*/
|
|
result = schannel_connect_step2(conn, sockindex);
|
|
if(result || (nonblocking &&
|
|
(ssl_connect_2 == connssl->connecting_state ||
|
|
ssl_connect_2_reading == connssl->connecting_state ||
|
|
ssl_connect_2_writing == connssl->connecting_state)))
|
|
return result;
|
|
|
|
} /* repeat step2 until all transactions are done. */
|
|
|
|
if(ssl_connect_3 == connssl->connecting_state) {
|
|
result = schannel_connect_step3(conn, sockindex);
|
|
if(result)
|
|
return result;
|
|
}
|
|
|
|
if(ssl_connect_done == connssl->connecting_state) {
|
|
connssl->state = ssl_connection_complete;
|
|
conn->recv[sockindex] = schannel_recv;
|
|
conn->send[sockindex] = schannel_send;
|
|
*done = TRUE;
|
|
}
|
|
else
|
|
*done = FALSE;
|
|
|
|
/* reset our connection state machine */
|
|
connssl->connecting_state = ssl_connect_1;
|
|
|
|
return CURLE_OK;
|
|
}
|
|
|
|
static ssize_t
|
|
schannel_send(struct connectdata *conn, int sockindex,
|
|
const void *buf, size_t len, CURLcode *err)
|
|
{
|
|
ssize_t written = -1;
|
|
size_t data_len = 0;
|
|
unsigned char *data = NULL;
|
|
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
|
|
SecBuffer outbuf[4];
|
|
SecBufferDesc outbuf_desc;
|
|
SECURITY_STATUS sspi_status = SEC_E_OK;
|
|
CURLcode result;
|
|
|
|
/* check if the maximum stream sizes were queried */
|
|
if(connssl->stream_sizes.cbMaximumMessage == 0) {
|
|
sspi_status = s_pSecFn->QueryContextAttributes(
|
|
&connssl->ctxt->ctxt_handle,
|
|
SECPKG_ATTR_STREAM_SIZES,
|
|
&connssl->stream_sizes);
|
|
if(sspi_status != SEC_E_OK) {
|
|
*err = CURLE_SEND_ERROR;
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/* check if the buffer is longer than the maximum message length */
|
|
if(len > connssl->stream_sizes.cbMaximumMessage) {
|
|
*err = CURLE_SEND_ERROR;
|
|
return -1;
|
|
}
|
|
|
|
/* calculate the complete message length and allocate a buffer for it */
|
|
data_len = connssl->stream_sizes.cbHeader + len +
|
|
connssl->stream_sizes.cbTrailer;
|
|
data = (unsigned char *) malloc(data_len);
|
|
if(data == NULL) {
|
|
*err = CURLE_OUT_OF_MEMORY;
|
|
return -1;
|
|
}
|
|
|
|
/* setup output buffers (header, data, trailer, empty) */
|
|
InitSecBuffer(&outbuf[0], SECBUFFER_STREAM_HEADER,
|
|
data, connssl->stream_sizes.cbHeader);
|
|
InitSecBuffer(&outbuf[1], SECBUFFER_DATA,
|
|
data + connssl->stream_sizes.cbHeader, curlx_uztoul(len));
|
|
InitSecBuffer(&outbuf[2], SECBUFFER_STREAM_TRAILER,
|
|
data + connssl->stream_sizes.cbHeader + len,
|
|
connssl->stream_sizes.cbTrailer);
|
|
InitSecBuffer(&outbuf[3], SECBUFFER_EMPTY, NULL, 0);
|
|
InitSecBufferDesc(&outbuf_desc, outbuf, 4);
|
|
|
|
/* copy data into output buffer */
|
|
memcpy(outbuf[1].pvBuffer, buf, len);
|
|
|
|
/* https://msdn.microsoft.com/en-us/library/windows/desktop/aa375390.aspx */
|
|
sspi_status = s_pSecFn->EncryptMessage(&connssl->ctxt->ctxt_handle, 0,
|
|
&outbuf_desc, 0);
|
|
|
|
/* check if the message was encrypted */
|
|
if(sspi_status == SEC_E_OK) {
|
|
written = 0;
|
|
|
|
/* send the encrypted message including header, data and trailer */
|
|
len = outbuf[0].cbBuffer + outbuf[1].cbBuffer + outbuf[2].cbBuffer;
|
|
|
|
/*
|
|
It's important to send the full message which includes the header,
|
|
encrypted payload, and trailer. Until the client receives all the
|
|
data a coherent message has not been delivered and the client
|
|
can't read any of it.
|
|
|
|
If we wanted to buffer the unwritten encrypted bytes, we would
|
|
tell the client that all data it has requested to be sent has been
|
|
sent. The unwritten encrypted bytes would be the first bytes to
|
|
send on the next invocation.
|
|
Here's the catch with this - if we tell the client that all the
|
|
bytes have been sent, will the client call this method again to
|
|
send the buffered data? Looking at who calls this function, it
|
|
seems the answer is NO.
|
|
*/
|
|
|
|
/* send entire message or fail */
|
|
while(len > (size_t)written) {
|
|
ssize_t this_write;
|
|
long timeleft;
|
|
int what;
|
|
|
|
this_write = 0;
|
|
|
|
timeleft = Curl_timeleft(conn->data, NULL, FALSE);
|
|
if(timeleft < 0) {
|
|
/* we already got the timeout */
|
|
failf(conn->data, "schannel: timed out sending data "
|
|
"(bytes sent: %zd)", written);
|
|
*err = CURLE_OPERATION_TIMEDOUT;
|
|
written = -1;
|
|
break;
|
|
}
|
|
|
|
what = Curl_socket_ready(CURL_SOCKET_BAD, conn->sock[sockindex],
|
|
timeleft);
|
|
if(what < 0) {
|
|
/* fatal error */
|
|
failf(conn->data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
|
|
*err = CURLE_SEND_ERROR;
|
|
written = -1;
|
|
break;
|
|
}
|
|
else if(0 == what) {
|
|
failf(conn->data, "schannel: timed out sending data "
|
|
"(bytes sent: %zd)", written);
|
|
*err = CURLE_OPERATION_TIMEDOUT;
|
|
written = -1;
|
|
break;
|
|
}
|
|
/* socket is writable */
|
|
|
|
result = Curl_write_plain(conn, conn->sock[sockindex], data + written,
|
|
len - written, &this_write);
|
|
if(result == CURLE_AGAIN)
|
|
continue;
|
|
else if(result != CURLE_OK) {
|
|
*err = result;
|
|
written = -1;
|
|
break;
|
|
}
|
|
|
|
written += this_write;
|
|
}
|
|
}
|
|
else if(sspi_status == SEC_E_INSUFFICIENT_MEMORY) {
|
|
*err = CURLE_OUT_OF_MEMORY;
|
|
}
|
|
else{
|
|
*err = CURLE_SEND_ERROR;
|
|
}
|
|
|
|
Curl_safefree(data);
|
|
|
|
if(len == (size_t)written)
|
|
/* Encrypted message including header, data and trailer entirely sent.
|
|
The return value is the number of unencrypted bytes that were sent. */
|
|
written = outbuf[1].cbBuffer;
|
|
|
|
return written;
|
|
}
|
|
|
|
static ssize_t
|
|
schannel_recv(struct connectdata *conn, int sockindex,
|
|
char *buf, size_t len, CURLcode *err)
|
|
{
|
|
size_t size = 0;
|
|
ssize_t nread = -1;
|
|
struct SessionHandle *data = conn->data;
|
|
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
|
|
unsigned char *reallocated_buffer;
|
|
size_t reallocated_length;
|
|
bool done = FALSE;
|
|
SecBuffer inbuf[4];
|
|
SecBufferDesc inbuf_desc;
|
|
SECURITY_STATUS sspi_status = SEC_E_OK;
|
|
/* we want the length of the encrypted buffer to be at least large enough
|
|
that it can hold all the bytes requested and some TLS record overhead. */
|
|
size_t min_encdata_length = len + CURL_SCHANNEL_BUFFER_FREE_SIZE;
|
|
|
|
/****************************************************************************
|
|
* Don't return or set connssl->recv_unrecoverable_err unless in the cleanup.
|
|
* The pattern for return error is set *err, optional infof, goto cleanup.
|
|
*
|
|
* Our priority is to always return as much decrypted data to the caller as
|
|
* possible, even if an error occurs. The state of the decrypted buffer must
|
|
* always be valid. Transfer of decrypted data to the caller's buffer is
|
|
* handled in the cleanup.
|
|
*/
|
|
|
|
infof(data, "schannel: client wants to read %zu bytes\n", len);
|
|
*err = CURLE_OK;
|
|
|
|
if(len && len <= connssl->decdata_offset) {
|
|
infof(data, "schannel: enough decrypted data is already available\n");
|
|
goto cleanup;
|
|
}
|
|
else if(connssl->recv_unrecoverable_err) {
|
|
*err = connssl->recv_unrecoverable_err;
|
|
infof(data, "schannel: an unrecoverable error occurred in a prior call\n");
|
|
goto cleanup;
|
|
}
|
|
else if(connssl->recv_sspi_close_notify) {
|
|
/* once a server has indicated shutdown there is no more encrypted data */
|
|
infof(data, "schannel: server indicated shutdown in a prior call\n");
|
|
goto cleanup;
|
|
}
|
|
else if(!len) {
|
|
/* It's debatable what to return when !len. Regardless we can't return
|
|
immediately because there may be data to decrypt (in the case we want to
|
|
decrypt all encrypted cached data) so handle !len later in cleanup.
|
|
*/
|
|
; /* do nothing */
|
|
}
|
|
else if(!connssl->recv_connection_closed) {
|
|
/* increase enc buffer in order to fit the requested amount of data */
|
|
size = connssl->encdata_length - connssl->encdata_offset;
|
|
if(size < CURL_SCHANNEL_BUFFER_FREE_SIZE ||
|
|
connssl->encdata_length < min_encdata_length) {
|
|
reallocated_length = connssl->encdata_offset +
|
|
CURL_SCHANNEL_BUFFER_FREE_SIZE;
|
|
if(reallocated_length < min_encdata_length) {
|
|
reallocated_length = min_encdata_length;
|
|
}
|
|
reallocated_buffer = realloc(connssl->encdata_buffer,
|
|
reallocated_length);
|
|
if(reallocated_buffer == NULL) {
|
|
*err = CURLE_OUT_OF_MEMORY;
|
|
failf(data, "schannel: unable to re-allocate memory");
|
|
goto cleanup;
|
|
}
|
|
|
|
connssl->encdata_buffer = reallocated_buffer;
|
|
connssl->encdata_length = reallocated_length;
|
|
size = connssl->encdata_length - connssl->encdata_offset;
|
|
infof(data, "schannel: encdata_buffer resized %zu\n",
|
|
connssl->encdata_length);
|
|
}
|
|
|
|
infof(data, "schannel: encrypted data buffer: offset %zu length %zu\n",
|
|
connssl->encdata_offset, connssl->encdata_length);
|
|
|
|
/* read encrypted data from socket */
|
|
*err = Curl_read_plain(conn->sock[sockindex],
|
|
(char *)(connssl->encdata_buffer +
|
|
connssl->encdata_offset),
|
|
size, &nread);
|
|
if(*err) {
|
|
nread = -1;
|
|
if(*err == CURLE_AGAIN)
|
|
infof(data, "schannel: Curl_read_plain returned CURLE_AGAIN\n");
|
|
else if(*err == CURLE_RECV_ERROR)
|
|
infof(data, "schannel: Curl_read_plain returned CURLE_RECV_ERROR\n");
|
|
else
|
|
infof(data, "schannel: Curl_read_plain returned error %d\n", *err);
|
|
}
|
|
else if(nread == 0) {
|
|
connssl->recv_connection_closed = true;
|
|
infof(data, "schannel: server closed the connection\n");
|
|
}
|
|
else if(nread > 0) {
|
|
connssl->encdata_offset += (size_t)nread;
|
|
infof(data, "schannel: encrypted data got %zd\n", nread);
|
|
}
|
|
}
|
|
|
|
infof(data, "schannel: encrypted data buffer: offset %zu length %zu\n",
|
|
connssl->encdata_offset, connssl->encdata_length);
|
|
|
|
/* decrypt loop */
|
|
while(connssl->encdata_offset > 0 && sspi_status == SEC_E_OK &&
|
|
(!len || connssl->decdata_offset < len ||
|
|
connssl->recv_connection_closed)) {
|
|
/* prepare data buffer for DecryptMessage call */
|
|
InitSecBuffer(&inbuf[0], SECBUFFER_DATA, connssl->encdata_buffer,
|
|
curlx_uztoul(connssl->encdata_offset));
|
|
|
|
/* we need 3 more empty input buffers for possible output */
|
|
InitSecBuffer(&inbuf[1], SECBUFFER_EMPTY, NULL, 0);
|
|
InitSecBuffer(&inbuf[2], SECBUFFER_EMPTY, NULL, 0);
|
|
InitSecBuffer(&inbuf[3], SECBUFFER_EMPTY, NULL, 0);
|
|
InitSecBufferDesc(&inbuf_desc, inbuf, 4);
|
|
|
|
/* https://msdn.microsoft.com/en-us/library/windows/desktop/aa375348.aspx
|
|
*/
|
|
sspi_status = s_pSecFn->DecryptMessage(&connssl->ctxt->ctxt_handle,
|
|
&inbuf_desc, 0, NULL);
|
|
|
|
/* check if everything went fine (server may want to renegotiate
|
|
or shutdown the connection context) */
|
|
if(sspi_status == SEC_E_OK || sspi_status == SEC_I_RENEGOTIATE ||
|
|
sspi_status == SEC_I_CONTEXT_EXPIRED) {
|
|
/* check for successfully decrypted data, even before actual
|
|
renegotiation or shutdown of the connection context */
|
|
if(inbuf[1].BufferType == SECBUFFER_DATA) {
|
|
infof(data, "schannel: decrypted data length: %lu\n",
|
|
inbuf[1].cbBuffer);
|
|
|
|
/* increase buffer in order to fit the received amount of data */
|
|
size = inbuf[1].cbBuffer > CURL_SCHANNEL_BUFFER_FREE_SIZE ?
|
|
inbuf[1].cbBuffer : CURL_SCHANNEL_BUFFER_FREE_SIZE;
|
|
if(connssl->decdata_length - connssl->decdata_offset < size ||
|
|
connssl->decdata_length < len) {
|
|
/* increase internal decrypted data buffer */
|
|
reallocated_length = connssl->decdata_offset + size;
|
|
/* make sure that the requested amount of data fits */
|
|
if(reallocated_length < len) {
|
|
reallocated_length = len;
|
|
}
|
|
reallocated_buffer = realloc(connssl->decdata_buffer,
|
|
reallocated_length);
|
|
if(reallocated_buffer == NULL) {
|
|
*err = CURLE_OUT_OF_MEMORY;
|
|
failf(data, "schannel: unable to re-allocate memory");
|
|
goto cleanup;
|
|
}
|
|
connssl->decdata_buffer = reallocated_buffer;
|
|
connssl->decdata_length = reallocated_length;
|
|
}
|
|
|
|
/* copy decrypted data to internal buffer */
|
|
size = inbuf[1].cbBuffer;
|
|
if(size) {
|
|
memcpy(connssl->decdata_buffer + connssl->decdata_offset,
|
|
inbuf[1].pvBuffer, size);
|
|
connssl->decdata_offset += size;
|
|
}
|
|
|
|
infof(data, "schannel: decrypted data added: %zu\n", size);
|
|
infof(data, "schannel: decrypted data cached: offset %zu length %zu\n",
|
|
connssl->decdata_offset, connssl->decdata_length);
|
|
}
|
|
|
|
/* check for remaining encrypted data */
|
|
if(inbuf[3].BufferType == SECBUFFER_EXTRA && inbuf[3].cbBuffer > 0) {
|
|
infof(data, "schannel: encrypted data length: %lu\n",
|
|
inbuf[3].cbBuffer);
|
|
|
|
/* check if the remaining data is less than the total amount
|
|
* and therefore begins after the already processed data
|
|
*/
|
|
if(connssl->encdata_offset > inbuf[3].cbBuffer) {
|
|
/* move remaining encrypted data forward to the beginning of
|
|
buffer */
|
|
memmove(connssl->encdata_buffer,
|
|
(connssl->encdata_buffer + connssl->encdata_offset) -
|
|
inbuf[3].cbBuffer, inbuf[3].cbBuffer);
|
|
connssl->encdata_offset = inbuf[3].cbBuffer;
|
|
}
|
|
|
|
infof(data, "schannel: encrypted data cached: offset %zu length %zu\n",
|
|
connssl->encdata_offset, connssl->encdata_length);
|
|
}
|
|
else {
|
|
/* reset encrypted buffer offset, because there is no data remaining */
|
|
connssl->encdata_offset = 0;
|
|
}
|
|
|
|
/* check if server wants to renegotiate the connection context */
|
|
if(sspi_status == SEC_I_RENEGOTIATE) {
|
|
infof(data, "schannel: remote party requests renegotiation\n");
|
|
if(*err && *err != CURLE_AGAIN) {
|
|
infof(data, "schannel: can't renogotiate, an error is pending\n");
|
|
goto cleanup;
|
|
}
|
|
if(connssl->encdata_offset) {
|
|
*err = CURLE_RECV_ERROR;
|
|
infof(data, "schannel: can't renogotiate, "
|
|
"encrypted data available\n");
|
|
goto cleanup;
|
|
}
|
|
/* begin renegotiation */
|
|
infof(data, "schannel: renegotiating SSL/TLS connection\n");
|
|
connssl->state = ssl_connection_negotiating;
|
|
connssl->connecting_state = ssl_connect_2_writing;
|
|
*err = schannel_connect_common(conn, sockindex, FALSE, &done);
|
|
if(*err) {
|
|
infof(data, "schannel: renegotiation failed\n");
|
|
goto cleanup;
|
|
}
|
|
/* now retry receiving data */
|
|
sspi_status = SEC_E_OK;
|
|
infof(data, "schannel: SSL/TLS connection renegotiated\n");
|
|
continue;
|
|
}
|
|
/* check if the server closed the connection */
|
|
else if(sspi_status == SEC_I_CONTEXT_EXPIRED) {
|
|
/* In Windows 2000 SEC_I_CONTEXT_EXPIRED (close_notify) is not
|
|
returned so we have to work around that in cleanup. */
|
|
connssl->recv_sspi_close_notify = true;
|
|
if(!connssl->recv_connection_closed) {
|
|
connssl->recv_connection_closed = true;
|
|
infof(data, "schannel: server closed the connection\n");
|
|
}
|
|
goto cleanup;
|
|
}
|
|
}
|
|
else if(sspi_status == SEC_E_INCOMPLETE_MESSAGE) {
|
|
if(!*err)
|
|
*err = CURLE_AGAIN;
|
|
infof(data, "schannel: failed to decrypt data, need more data\n");
|
|
goto cleanup;
|
|
}
|
|
else {
|
|
*err = CURLE_RECV_ERROR;
|
|
infof(data, "schannel: failed to read data from server: %s\n",
|
|
Curl_sspi_strerror(conn, sspi_status));
|
|
goto cleanup;
|
|
}
|
|
}
|
|
|
|
infof(data, "schannel: encrypted data buffer: offset %zu length %zu\n",
|
|
connssl->encdata_offset, connssl->encdata_length);
|
|
|
|
infof(data, "schannel: decrypted data buffer: offset %zu length %zu\n",
|
|
connssl->decdata_offset, connssl->decdata_length);
|
|
|
|
cleanup:
|
|
/* Warning- there is no guarantee the encdata state is valid at this point */
|
|
infof(data, "schannel: schannel_recv cleanup\n");
|
|
|
|
/* Error if the connection has closed without a close_notify.
|
|
Behavior here is a matter of debate. We don't want to be vulnerable to a
|
|
truncation attack however there's some browser precedent for ignoring the
|
|
close_notify for compatibility reasons.
|
|
Additionally, Windows 2000 (v5.0) is a special case since it seems it doesn't
|
|
return close_notify. In that case if the connection was closed we assume it
|
|
was graceful (close_notify) since there doesn't seem to be a way to tell.
|
|
*/
|
|
if(len && !connssl->decdata_offset && connssl->recv_connection_closed &&
|
|
!connssl->recv_sspi_close_notify) {
|
|
bool isWin2k = FALSE;
|
|
|
|
#if !defined(_WIN32_WINNT) || !defined(_WIN32_WINNT_WIN2K) || \
|
|
(_WIN32_WINNT < _WIN32_WINNT_WIN2K)
|
|
OSVERSIONINFO osver;
|
|
|
|
memset(&osver, 0, sizeof(osver));
|
|
osver.dwOSVersionInfoSize = sizeof(osver);
|
|
|
|
/* Find out the Windows version */
|
|
if(GetVersionEx(&osver)) {
|
|
/* Verify the version number is 5.0 */
|
|
if(osver.dwMajorVersion == 5 && osver.dwMinorVersion == 0)
|
|
isWin2k = TRUE;
|
|
}
|
|
#else
|
|
ULONGLONG cm;
|
|
OSVERSIONINFOEX osver;
|
|
|
|
memset(&osver, 0, sizeof(osver));
|
|
osver.dwOSVersionInfoSize = sizeof(osver);
|
|
osver.dwMajorVersion = 5;
|
|
|
|
cm = VerSetConditionMask(0, VER_MAJORVERSION, VER_EQUAL);
|
|
cm = VerSetConditionMask(cm, VER_MINORVERSION, VER_EQUAL);
|
|
cm = VerSetConditionMask(cm, VER_SERVICEPACKMAJOR, VER_GREATER_EQUAL);
|
|
cm = VerSetConditionMask(cm, VER_SERVICEPACKMINOR, VER_GREATER_EQUAL);
|
|
|
|
if(VerifyVersionInfo(&osver, (VER_MAJORVERSION | VER_MINORVERSION |
|
|
VER_SERVICEPACKMAJOR | VER_SERVICEPACKMINOR),
|
|
cm))
|
|
isWin2k = TRUE;
|
|
#endif
|
|
|
|
if(isWin2k && sspi_status == SEC_E_OK)
|
|
connssl->recv_sspi_close_notify = true;
|
|
else {
|
|
*err = CURLE_RECV_ERROR;
|
|
infof(data, "schannel: server closed abruptly (missing close_notify)\n");
|
|
}
|
|
}
|
|
|
|
/* Any error other than CURLE_AGAIN is an unrecoverable error. */
|
|
if(*err && *err != CURLE_AGAIN)
|
|
connssl->recv_unrecoverable_err = *err;
|
|
|
|
size = len < connssl->decdata_offset ? len : connssl->decdata_offset;
|
|
if(size) {
|
|
memcpy(buf, connssl->decdata_buffer, size);
|
|
memmove(connssl->decdata_buffer, connssl->decdata_buffer + size,
|
|
connssl->decdata_offset - size);
|
|
connssl->decdata_offset -= size;
|
|
|
|
infof(data, "schannel: decrypted data returned %zu\n", size);
|
|
infof(data, "schannel: decrypted data buffer: offset %zu length %zu\n",
|
|
connssl->decdata_offset, connssl->decdata_length);
|
|
*err = CURLE_OK;
|
|
return (ssize_t)size;
|
|
}
|
|
|
|
if(!*err && !connssl->recv_connection_closed)
|
|
*err = CURLE_AGAIN;
|
|
|
|
/* It's debatable what to return when !len. We could return whatever error we
|
|
got from decryption but instead we override here so the return is consistent.
|
|
*/
|
|
if(!len)
|
|
*err = CURLE_OK;
|
|
|
|
return *err ? -1 : 0;
|
|
}
|
|
|
|
CURLcode
|
|
Curl_schannel_connect_nonblocking(struct connectdata *conn, int sockindex,
|
|
bool *done)
|
|
{
|
|
return schannel_connect_common(conn, sockindex, TRUE, done);
|
|
}
|
|
|
|
CURLcode
|
|
Curl_schannel_connect(struct connectdata *conn, int sockindex)
|
|
{
|
|
CURLcode result;
|
|
bool done = FALSE;
|
|
|
|
result = schannel_connect_common(conn, sockindex, FALSE, &done);
|
|
if(result)
|
|
return result;
|
|
|
|
DEBUGASSERT(done);
|
|
|
|
return CURLE_OK;
|
|
}
|
|
|
|
bool Curl_schannel_data_pending(const struct connectdata *conn, int sockindex)
|
|
{
|
|
const struct ssl_connect_data *connssl = &conn->ssl[sockindex];
|
|
|
|
if(connssl->use) /* SSL/TLS is in use */
|
|
return (connssl->encdata_offset > 0 ||
|
|
connssl->decdata_offset > 0) ? TRUE : FALSE;
|
|
else
|
|
return FALSE;
|
|
}
|
|
|
|
void Curl_schannel_close(struct connectdata *conn, int sockindex)
|
|
{
|
|
if(conn->ssl[sockindex].use)
|
|
/* if the SSL/TLS channel hasn't been shut down yet, do that now. */
|
|
Curl_ssl_shutdown(conn, sockindex);
|
|
}
|
|
|
|
int Curl_schannel_shutdown(struct connectdata *conn, int sockindex)
|
|
{
|
|
/* See https://msdn.microsoft.com/en-us/library/windows/desktop/aa380138.aspx
|
|
* Shutting Down an Schannel Connection
|
|
*/
|
|
struct SessionHandle *data = conn->data;
|
|
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
|
|
|
|
infof(data, "schannel: shutting down SSL/TLS connection with %s port %hu\n",
|
|
conn->host.name, conn->remote_port);
|
|
|
|
if(connssl->cred && connssl->ctxt) {
|
|
SecBufferDesc BuffDesc;
|
|
SecBuffer Buffer;
|
|
SECURITY_STATUS sspi_status;
|
|
SecBuffer outbuf;
|
|
SecBufferDesc outbuf_desc;
|
|
CURLcode result;
|
|
TCHAR *host_name;
|
|
DWORD dwshut = SCHANNEL_SHUTDOWN;
|
|
|
|
InitSecBuffer(&Buffer, SECBUFFER_TOKEN, &dwshut, sizeof(dwshut));
|
|
InitSecBufferDesc(&BuffDesc, &Buffer, 1);
|
|
|
|
sspi_status = s_pSecFn->ApplyControlToken(&connssl->ctxt->ctxt_handle,
|
|
&BuffDesc);
|
|
|
|
if(sspi_status != SEC_E_OK)
|
|
failf(data, "schannel: ApplyControlToken failure: %s",
|
|
Curl_sspi_strerror(conn, sspi_status));
|
|
|
|
host_name = Curl_convert_UTF8_to_tchar(conn->host.name);
|
|
if(!host_name)
|
|
return CURLE_OUT_OF_MEMORY;
|
|
|
|
/* setup output buffer */
|
|
InitSecBuffer(&outbuf, SECBUFFER_EMPTY, NULL, 0);
|
|
InitSecBufferDesc(&outbuf_desc, &outbuf, 1);
|
|
|
|
sspi_status = s_pSecFn->InitializeSecurityContext(
|
|
&connssl->cred->cred_handle,
|
|
&connssl->ctxt->ctxt_handle,
|
|
host_name,
|
|
connssl->req_flags,
|
|
0,
|
|
0,
|
|
NULL,
|
|
0,
|
|
&connssl->ctxt->ctxt_handle,
|
|
&outbuf_desc,
|
|
&connssl->ret_flags,
|
|
&connssl->ctxt->time_stamp);
|
|
|
|
Curl_unicodefree(host_name);
|
|
|
|
if((sspi_status == SEC_E_OK) || (sspi_status == SEC_I_CONTEXT_EXPIRED)) {
|
|
/* send close message which is in output buffer */
|
|
ssize_t written;
|
|
result = Curl_write_plain(conn, conn->sock[sockindex], outbuf.pvBuffer,
|
|
outbuf.cbBuffer, &written);
|
|
|
|
s_pSecFn->FreeContextBuffer(outbuf.pvBuffer);
|
|
if((result != CURLE_OK) || (outbuf.cbBuffer != (size_t) written)) {
|
|
infof(data, "schannel: failed to send close msg: %s"
|
|
" (bytes written: %zd)\n", curl_easy_strerror(result), written);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* free SSPI Schannel API security context handle */
|
|
if(connssl->ctxt) {
|
|
infof(data, "schannel: clear security context handle\n");
|
|
s_pSecFn->DeleteSecurityContext(&connssl->ctxt->ctxt_handle);
|
|
Curl_safefree(connssl->ctxt);
|
|
}
|
|
|
|
/* free SSPI Schannel API credential handle */
|
|
if(connssl->cred) {
|
|
/* decrement the reference counter of the credential/session handle */
|
|
if(connssl->cred->refcount > 0) {
|
|
connssl->cred->refcount--;
|
|
infof(data, "schannel: decremented credential handle refcount = %d\n",
|
|
connssl->cred->refcount);
|
|
}
|
|
|
|
/* if the handle was not cached and the refcount is zero */
|
|
if(!connssl->cred->cached && connssl->cred->refcount == 0) {
|
|
infof(data, "schannel: clear credential handle\n");
|
|
s_pSecFn->FreeCredentialsHandle(&connssl->cred->cred_handle);
|
|
Curl_safefree(connssl->cred);
|
|
}
|
|
}
|
|
|
|
/* free internal buffer for received encrypted data */
|
|
if(connssl->encdata_buffer != NULL) {
|
|
Curl_safefree(connssl->encdata_buffer);
|
|
connssl->encdata_length = 0;
|
|
connssl->encdata_offset = 0;
|
|
}
|
|
|
|
/* free internal buffer for received decrypted data */
|
|
if(connssl->decdata_buffer != NULL) {
|
|
Curl_safefree(connssl->decdata_buffer);
|
|
connssl->decdata_length = 0;
|
|
connssl->decdata_offset = 0;
|
|
}
|
|
|
|
return CURLE_OK;
|
|
}
|
|
|
|
void Curl_schannel_session_free(void *ptr)
|
|
{
|
|
struct curl_schannel_cred *cred = ptr;
|
|
|
|
if(cred && cred->cached) {
|
|
if(cred->refcount == 0) {
|
|
s_pSecFn->FreeCredentialsHandle(&cred->cred_handle);
|
|
Curl_safefree(cred);
|
|
}
|
|
else {
|
|
cred->cached = FALSE;
|
|
}
|
|
}
|
|
}
|
|
|
|
int Curl_schannel_init(void)
|
|
{
|
|
return (Curl_sspi_global_init() == CURLE_OK ? 1 : 0);
|
|
}
|
|
|
|
void Curl_schannel_cleanup(void)
|
|
{
|
|
Curl_sspi_global_cleanup();
|
|
}
|
|
|
|
size_t Curl_schannel_version(char *buffer, size_t size)
|
|
{
|
|
size = snprintf(buffer, size, "WinSSL");
|
|
|
|
return size;
|
|
}
|
|
|
|
int Curl_schannel_random(unsigned char *entropy, size_t length)
|
|
{
|
|
HCRYPTPROV hCryptProv = 0;
|
|
|
|
if(!CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_FULL,
|
|
CRYPT_VERIFYCONTEXT | CRYPT_SILENT))
|
|
return 1;
|
|
|
|
if(!CryptGenRandom(hCryptProv, (DWORD)length, entropy)) {
|
|
CryptReleaseContext(hCryptProv, 0UL);
|
|
return 1;
|
|
}
|
|
|
|
CryptReleaseContext(hCryptProv, 0UL);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef _WIN32_WCE
|
|
static CURLcode verify_certificate(struct connectdata *conn, int sockindex)
|
|
{
|
|
SECURITY_STATUS status;
|
|
struct SessionHandle *data = conn->data;
|
|
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
|
|
CURLcode result = CURLE_OK;
|
|
CERT_CONTEXT *pCertContextServer = NULL;
|
|
const CERT_CHAIN_CONTEXT *pChainContext = NULL;
|
|
|
|
status = s_pSecFn->QueryContextAttributes(&connssl->ctxt->ctxt_handle,
|
|
SECPKG_ATTR_REMOTE_CERT_CONTEXT,
|
|
&pCertContextServer);
|
|
|
|
if((status != SEC_E_OK) || (pCertContextServer == NULL)) {
|
|
failf(data, "schannel: Failed to read remote certificate context: %s",
|
|
Curl_sspi_strerror(conn, status));
|
|
result = CURLE_PEER_FAILED_VERIFICATION;
|
|
}
|
|
|
|
if(result == CURLE_OK) {
|
|
CERT_CHAIN_PARA ChainPara;
|
|
memset(&ChainPara, 0, sizeof(ChainPara));
|
|
ChainPara.cbSize = sizeof(ChainPara);
|
|
|
|
if(!CertGetCertificateChain(NULL,
|
|
pCertContextServer,
|
|
NULL,
|
|
pCertContextServer->hCertStore,
|
|
&ChainPara,
|
|
(data->set.ssl_no_revoke ? 0 :
|
|
CERT_CHAIN_REVOCATION_CHECK_CHAIN),
|
|
NULL,
|
|
&pChainContext)) {
|
|
failf(data, "schannel: CertGetCertificateChain failed: %s",
|
|
Curl_sspi_strerror(conn, GetLastError()));
|
|
pChainContext = NULL;
|
|
result = CURLE_PEER_FAILED_VERIFICATION;
|
|
}
|
|
|
|
if(result == CURLE_OK) {
|
|
CERT_SIMPLE_CHAIN *pSimpleChain = pChainContext->rgpChain[0];
|
|
DWORD dwTrustErrorMask = ~(DWORD)(CERT_TRUST_IS_NOT_TIME_NESTED);
|
|
dwTrustErrorMask &= pSimpleChain->TrustStatus.dwErrorStatus;
|
|
if(dwTrustErrorMask) {
|
|
if(dwTrustErrorMask & CERT_TRUST_IS_REVOKED)
|
|
failf(data, "schannel: CertGetCertificateChain trust error"
|
|
" CERT_TRUST_IS_REVOKED");
|
|
else if(dwTrustErrorMask & CERT_TRUST_IS_PARTIAL_CHAIN)
|
|
failf(data, "schannel: CertGetCertificateChain trust error"
|
|
" CERT_TRUST_IS_PARTIAL_CHAIN");
|
|
else if(dwTrustErrorMask & CERT_TRUST_IS_UNTRUSTED_ROOT)
|
|
failf(data, "schannel: CertGetCertificateChain trust error"
|
|
" CERT_TRUST_IS_UNTRUSTED_ROOT");
|
|
else if(dwTrustErrorMask & CERT_TRUST_IS_NOT_TIME_VALID)
|
|
failf(data, "schannel: CertGetCertificateChain trust error"
|
|
" CERT_TRUST_IS_NOT_TIME_VALID");
|
|
else
|
|
failf(data, "schannel: CertGetCertificateChain error mask: 0x%08x",
|
|
dwTrustErrorMask);
|
|
result = CURLE_PEER_FAILED_VERIFICATION;
|
|
}
|
|
}
|
|
}
|
|
|
|
if(result == CURLE_OK) {
|
|
if(data->set.ssl.verifyhost) {
|
|
TCHAR cert_hostname_buff[128];
|
|
xcharp_u hostname;
|
|
xcharp_u cert_hostname;
|
|
DWORD len;
|
|
|
|
cert_hostname.const_tchar_ptr = cert_hostname_buff;
|
|
hostname.tchar_ptr = Curl_convert_UTF8_to_tchar(conn->host.name);
|
|
|
|
/* TODO: Fix this for certificates with multiple alternative names.
|
|
Right now we're only asking for the first preferred alternative name.
|
|
Instead we'd need to do all via CERT_NAME_SEARCH_ALL_NAMES_FLAG
|
|
(if WinCE supports that?) and run this section in a loop for each.
|
|
https://msdn.microsoft.com/en-us/library/windows/desktop/aa376086.aspx
|
|
curl: (51) schannel: CertGetNameString() certificate hostname
|
|
(.google.com) did not match connection (google.com)
|
|
*/
|
|
len = CertGetNameString(pCertContextServer,
|
|
CERT_NAME_DNS_TYPE,
|
|
0,
|
|
NULL,
|
|
cert_hostname.tchar_ptr,
|
|
128);
|
|
if(len > 0 && *cert_hostname.tchar_ptr == '*') {
|
|
/* this is a wildcard cert. try matching the last len - 1 chars */
|
|
int hostname_len = strlen(conn->host.name);
|
|
cert_hostname.tchar_ptr++;
|
|
if(_tcsicmp(cert_hostname.const_tchar_ptr,
|
|
hostname.const_tchar_ptr + hostname_len - len + 2) != 0)
|
|
result = CURLE_PEER_FAILED_VERIFICATION;
|
|
}
|
|
else if(len == 0 || _tcsicmp(hostname.const_tchar_ptr,
|
|
cert_hostname.const_tchar_ptr) != 0) {
|
|
result = CURLE_PEER_FAILED_VERIFICATION;
|
|
}
|
|
if(result == CURLE_PEER_FAILED_VERIFICATION) {
|
|
char *_cert_hostname;
|
|
_cert_hostname = Curl_convert_tchar_to_UTF8(cert_hostname.tchar_ptr);
|
|
failf(data, "schannel: CertGetNameString() certificate hostname "
|
|
"(%s) did not match connection (%s)",
|
|
_cert_hostname, conn->host.name);
|
|
Curl_unicodefree(_cert_hostname);
|
|
}
|
|
Curl_unicodefree(hostname.tchar_ptr);
|
|
}
|
|
}
|
|
|
|
if(pChainContext)
|
|
CertFreeCertificateChain(pChainContext);
|
|
|
|
if(pCertContextServer)
|
|
CertFreeCertificateContext(pCertContextServer);
|
|
|
|
return result;
|
|
}
|
|
#endif /* _WIN32_WCE */
|
|
|
|
#endif /* USE_SCHANNEL */
|