diff options
Diffstat (limited to 'libcurl/src/lib/vtls/schannel.c')
| -rw-r--r-- | libcurl/src/lib/vtls/schannel.c | 1364 |
1 files changed, 1364 insertions, 0 deletions
diff --git a/libcurl/src/lib/vtls/schannel.c b/libcurl/src/lib/vtls/schannel.c new file mode 100644 index 0000000..00f6b81 --- /dev/null +++ b/libcurl/src/lib/vtls/schannel.c @@ -0,0 +1,1364 @@ +/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 2012 - 2014, Marc Hoersken, <info@marc-hoersken.de>
+ * Copyright (C) 2012, Mark Salisbury, <mark.salisbury@hp.com>
+ * Copyright (C) 2012 - 2015, 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.
+ *
+ ***************************************************************************/
+
+/*
+ * Source file for all SChannel-specific code for the TLS/SSL layer. No code
+ * but vtls.c should ever call or use these functions.
+ *
+ */
+
+/*
+ * Based upon the PolarSSL implementation in polarssl.c and polarssl.h:
+ * Copyright (C) 2010, 2011, Hoi-Ho Chan, <hoiho.chan@gmail.com>
+ *
+ * Based upon the CyaSSL implementation in cyassl.c and cyassl.h:
+ * Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * Thanks for code and inspiration!
+ */
+
+#include "../curl_setup.h"
+
+#ifdef USE_SCHANNEL
+
+#ifndef USE_WINDOWS_SSPI
+# error "Can't compile SCHANNEL support without SSPI."
+#endif
+
+#include "../curl_sspi.h"
+#include "schannel.h"
+#include "vtls.h"
+#include "../sendf.h"
+#include "../connect.h" /* for the connect timeout */
+#include "../strerror.h"
+#include "../select.h" /* for the socket readyness */
+#include "../inet_pton.h" /* for IP addr SNI check */
+#include "../curl_multibyte.h"
+#include "../warnless.h"
+#include "../curl_printf.h"
+#include "../curl_memory.h"
+/* The last #include file should be: */
+#include "../memdebug.h"
+
+/* Uncomment to force verbose output
+ * #define infof(x, y, ...) printf(y, __VA_ARGS__)
+ * #define failf(x, y, ...) printf(y, __VA_ARGS__)
+ */
+
+static Curl_recv schannel_recv;
+static Curl_send schannel_send;
+
+#ifdef _WIN32_WCE
+static CURLcode verify_certificate(struct connectdata *conn, int sockindex);
+#endif
+
+static void InitSecBuffer(SecBuffer *buffer, unsigned long BufType,
+ void *BufDataPtr, unsigned long BufByteSize)
+{
+ buffer->cbBuffer = BufByteSize;
+ buffer->BufferType = BufType;
+ buffer->pvBuffer = BufDataPtr;
+}
+
+static void InitSecBufferDesc(SecBufferDesc *desc, SecBuffer *BufArr,
+ unsigned long NumArrElem)
+{
+ desc->ulVersion = SECBUFFER_VERSION;
+ desc->pBuffers = BufArr;
+ desc->cBuffers = NumArrElem;
+}
+
+static CURLcode
+schannel_connect_step1(struct connectdata *conn, int sockindex)
+{
+ ssize_t written = -1;
+ struct SessionHandle *data = conn->data;
+ struct ssl_connect_data *connssl = &conn->ssl[sockindex];
+ SecBuffer outbuf;
+ SecBufferDesc outbuf_desc;
+ SCHANNEL_CRED schannel_cred;
+ SECURITY_STATUS sspi_status = SEC_E_OK;
+ struct curl_schannel_cred *old_cred = NULL;
+ struct in_addr addr;
+#ifdef ENABLE_IPV6
+ struct in6_addr addr6;
+#endif
+ TCHAR *host_name;
+ CURLcode result;
+
+ infof(data, "schannel: SSL/TLS connection with %s port %hu (step 1/3)\n",
+ conn->host.name, conn->remote_port);
+
+ /* check for an existing re-usable credential handle */
+ if(!Curl_ssl_getsessionid(conn, (void **)&old_cred, NULL)) {
+ connssl->cred = old_cred;
+ infof(data, "schannel: re-using existing credential handle\n");
+ }
+ else {
+ /* setup Schannel API options */
+ memset(&schannel_cred, 0, sizeof(schannel_cred));
+ schannel_cred.dwVersion = SCHANNEL_CRED_VERSION;
+
+ if(data->set.ssl.verifypeer) {
+#ifdef _WIN32_WCE
+ /* certificate validation on CE doesn't seem to work right; we'll
+ do it following a more manual process. */
+ schannel_cred.dwFlags = SCH_CRED_MANUAL_CRED_VALIDATION |
+ SCH_CRED_IGNORE_NO_REVOCATION_CHECK |
+ SCH_CRED_IGNORE_REVOCATION_OFFLINE;
+#else
+ schannel_cred.dwFlags = SCH_CRED_AUTO_CRED_VALIDATION |
+ SCH_CRED_REVOCATION_CHECK_CHAIN;
+#endif
+ infof(data, "schannel: checking server certificate revocation\n");
+ }
+ else {
+ schannel_cred.dwFlags = SCH_CRED_MANUAL_CRED_VALIDATION |
+ SCH_CRED_IGNORE_NO_REVOCATION_CHECK |
+ SCH_CRED_IGNORE_REVOCATION_OFFLINE;
+ infof(data, "schannel: disable server certificate revocation checks\n");
+ }
+
+ if(!data->set.ssl.verifyhost) {
+ schannel_cred.dwFlags |= SCH_CRED_NO_SERVERNAME_CHECK;
+ infof(data, "schannel: verifyhost setting prevents Schannel from "
+ "comparing the supplied target name with the subject "
+ "names in server certificates. Also disables SNI.\n");
+ }
+
+ switch(data->set.ssl.version) {
+ default:
+ case CURL_SSLVERSION_DEFAULT:
+ case CURL_SSLVERSION_TLSv1:
+ schannel_cred.grbitEnabledProtocols = SP_PROT_TLS1_0_CLIENT |
+ SP_PROT_TLS1_1_CLIENT |
+ SP_PROT_TLS1_2_CLIENT;
+ break;
+ case CURL_SSLVERSION_TLSv1_0:
+ schannel_cred.grbitEnabledProtocols = SP_PROT_TLS1_0_CLIENT;
+ break;
+ case CURL_SSLVERSION_TLSv1_1:
+ schannel_cred.grbitEnabledProtocols = SP_PROT_TLS1_1_CLIENT;
+ break;
+ case CURL_SSLVERSION_TLSv1_2:
+ schannel_cred.grbitEnabledProtocols = SP_PROT_TLS1_2_CLIENT;
+ break;
+ case CURL_SSLVERSION_SSLv3:
+ schannel_cred.grbitEnabledProtocols = SP_PROT_SSL3_CLIENT;
+ break;
+ case CURL_SSLVERSION_SSLv2:
+ schannel_cred.grbitEnabledProtocols = SP_PROT_SSL2_CLIENT;
+ break;
+ }
+
+ /* allocate memory for the re-usable credential handle */
+ connssl->cred = (struct curl_schannel_cred *)
+ malloc(sizeof(struct curl_schannel_cred));
+ if(!connssl->cred) {
+ failf(data, "schannel: unable to allocate memory");
+ return CURLE_OUT_OF_MEMORY;
+ }
+ memset(connssl->cred, 0, sizeof(struct curl_schannel_cred));
+
+ /* http://msdn.microsoft.com/en-us/library/windows/desktop/aa374716.aspx */
+ sspi_status = s_pSecFn->AcquireCredentialsHandle(NULL, (TCHAR *)UNISP_NAME,
+ SECPKG_CRED_OUTBOUND, NULL, &schannel_cred, NULL, NULL,
+ &connssl->cred->cred_handle, &connssl->cred->time_stamp);
+
+ if(sspi_status != SEC_E_OK) {
+ 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: AcquireCredentialsHandle failed: %s",
+ Curl_sspi_strerror(conn, sspi_status));
+ Curl_safefree(connssl->cred);
+ return CURLE_SSL_CONNECT_ERROR;
+ }
+ }
+
+ /* Warn if SNI is disabled due to use of an IP address */
+ if(Curl_inet_pton(AF_INET, conn->host.name, &addr)
+#ifdef ENABLE_IPV6
+ || Curl_inet_pton(AF_INET6, conn->host.name, &addr6)
+#endif
+ ) {
+ infof(data, "schannel: using IP address, SNI is not supported by OS.\n");
+ }
+
+ /* setup output buffer */
+ InitSecBuffer(&outbuf, SECBUFFER_EMPTY, NULL, 0);
+ InitSecBufferDesc(&outbuf_desc, &outbuf, 1);
+
+ /* setup request flags */
+ connssl->req_flags = ISC_REQ_SEQUENCE_DETECT | ISC_REQ_REPLAY_DETECT |
+ ISC_REQ_CONFIDENTIALITY | ISC_REQ_ALLOCATE_MEMORY |
+ ISC_REQ_STREAM;
+
+ /* allocate memory for the security context handle */
+ connssl->ctxt = (struct curl_schannel_ctxt *)
+ malloc(sizeof(struct curl_schannel_ctxt));
+ if(!connssl->ctxt) {
+ failf(data, "schannel: unable to allocate memory");
+ return CURLE_OUT_OF_MEMORY;
+ }
+ memset(connssl->ctxt, 0, sizeof(struct curl_schannel_ctxt));
+
+ host_name = Curl_convert_UTF8_to_tchar(conn->host.name);
+ if(!host_name)
+ return CURLE_OUT_OF_MEMORY;
+
+ /* http://msdn.microsoft.com/en-us/library/windows/desktop/aa375924.aspx */
+
+ sspi_status = s_pSecFn->InitializeSecurityContext(
+ &connssl->cred->cred_handle, NULL, 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_I_CONTINUE_NEEDED) {
+ 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: initial InitializeSecurityContext failed: %s",
+ Curl_sspi_strerror(conn, sspi_status));
+ Curl_safefree(connssl->ctxt);
+ return CURLE_SSL_CONNECT_ERROR;
+ }
+
+ infof(data, "schannel: sending initial handshake data: "
+ "sending %lu bytes...\n", outbuf.cbBuffer);
+
+ /* send initial handshake data which is now stored in output buffer */
+ 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)) {
+ failf(data, "schannel: failed to send initial handshake data: "
+ "sent %zd of %lu bytes", written, outbuf.cbBuffer);
+ return CURLE_SSL_CONNECT_ERROR;
+ }
+
+ infof(data, "schannel: sent initial handshake data: "
+ "sent %zd bytes\n", written);
+
+ /* continue to second handshake step */
+ connssl->connecting_state = ssl_connect_2;
+
+ return CURLE_OK;
+}
+
+static CURLcode
+schannel_connect_step2(struct connectdata *conn, int sockindex)
+{
+ int i;
+ ssize_t nread = -1, written = -1;
+ struct SessionHandle *data = conn->data;
+ struct ssl_connect_data *connssl = &conn->ssl[sockindex];
+ unsigned char *reallocated_buffer;
+ size_t reallocated_length;
+ SecBuffer outbuf[2];
+ SecBufferDesc outbuf_desc;
+ SecBuffer inbuf[2];
+ SecBufferDesc inbuf_desc;
+ SECURITY_STATUS sspi_status = SEC_E_OK;
+ TCHAR *host_name;
+ CURLcode result;
+ bool doread;
+
+ doread = (connssl->connecting_state != ssl_connect_2_writing) ? TRUE : FALSE;
+
+ infof(data, "schannel: SSL/TLS connection with %s port %hu (step 2/3)\n",
+ conn->host.name, conn->remote_port);
+
+ if(!connssl->cred || !connssl->ctxt)
+ return CURLE_SSL_CONNECT_ERROR;
+
+ /* buffer to store previously received and encrypted data */
+ if(connssl->encdata_buffer == NULL) {
+ connssl->encdata_offset = 0;
+ connssl->encdata_length = CURL_SCHANNEL_BUFFER_INIT_SIZE;
+ connssl->encdata_buffer = malloc(connssl->encdata_length);
+ if(connssl->encdata_buffer == NULL) {
+ failf(data, "schannel: unable to allocate memory");
+ return CURLE_OUT_OF_MEMORY;
+ }
+ }
+
+ /* if we need a bigger buffer to read a full message, increase buffer now */
+ if(connssl->encdata_length - connssl->encdata_offset <
+ CURL_SCHANNEL_BUFFER_FREE_SIZE) {
+ /* increase internal encrypted data buffer */
+ reallocated_length = connssl->encdata_offset +
+ CURL_SCHANNEL_BUFFER_FREE_SIZE;
+ reallocated_buffer = realloc(connssl->encdata_buffer,
+ reallocated_length);
+
+ if(reallocated_buffer == NULL) {
+ failf(data, "schannel: unable to re-allocate memory");
+ return CURLE_OUT_OF_MEMORY;
+ }
+ else {
+ connssl->encdata_buffer = reallocated_buffer;
+ connssl->encdata_length = reallocated_length;
+ }
+ }
+
+ for(;;) {
+ if(doread) {
+ /* read encrypted handshake data from socket */
+ result = Curl_read_plain(conn->sock[sockindex],
+ (char *) (connssl->encdata_buffer +
+ connssl->encdata_offset),
+ connssl->encdata_length -
+ connssl->encdata_offset,
+ &nread);
+ if(result == CURLE_AGAIN) {
+ if(connssl->connecting_state != ssl_connect_2_writing)
+ connssl->connecting_state = ssl_connect_2_reading;
+ infof(data, "schannel: failed to receive handshake, "
+ "need more data\n");
+ return CURLE_OK;
+ }
+ else if((result != CURLE_OK) || (nread == 0)) {
+ failf(data, "schannel: failed to receive handshake, "
+ "SSL/TLS connection failed");
+ return CURLE_SSL_CONNECT_ERROR;
+ }
+
+ /* increase encrypted data buffer offset */
+ connssl->encdata_offset += nread;
+ }
+
+ infof(data, "schannel: encrypted data buffer: offset %zu length %zu\n",
+ connssl->encdata_offset, connssl->encdata_length);
+
+ /* setup input buffers */
+ InitSecBuffer(&inbuf[0], SECBUFFER_TOKEN, malloc(connssl->encdata_offset),
+ curlx_uztoul(connssl->encdata_offset));
+ InitSecBuffer(&inbuf[1], SECBUFFER_EMPTY, NULL, 0);
+ InitSecBufferDesc(&inbuf_desc, inbuf, 2);
+
+ /* setup output buffers */
+ InitSecBuffer(&outbuf[0], SECBUFFER_TOKEN, NULL, 0);
+ InitSecBuffer(&outbuf[1], SECBUFFER_ALERT, NULL, 0);
+ InitSecBufferDesc(&outbuf_desc, outbuf, 2);
+
+ 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;
+
+ /* http://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;
+ }
+
+ /* check if the handshake needs to be continued */
+ if(sspi_status == SEC_I_CONTINUE_NEEDED || sspi_status == SEC_E_OK) {
+ for(i = 0; i < 2; 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;
+ 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;
+ }
+
+ /* 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);
+
+ /* http://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 = 0, ret = -1;
+ CURLcode result;
+ 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;
+
+ infof(data, "schannel: client wants to read %zu bytes\n", len);
+ *err = CURLE_OK;
+
+ /* buffer to store previously received and decrypted data */
+ if(connssl->decdata_buffer == NULL) {
+ connssl->decdata_offset = 0;
+ connssl->decdata_length = CURL_SCHANNEL_BUFFER_INIT_SIZE;
+ connssl->decdata_buffer = malloc(connssl->decdata_length);
+ if(connssl->decdata_buffer == NULL) {
+ failf(data, "schannel: unable to allocate memory");
+ *err = CURLE_OUT_OF_MEMORY;
+ return -1;
+ }
+ }
+
+ /* increase buffer in order to fit the requested amount of data */
+ if(connssl->encdata_length - connssl->encdata_offset <
+ CURL_SCHANNEL_BUFFER_FREE_SIZE || connssl->encdata_length < len) {
+ /* increase internal encrypted data buffer */
+ reallocated_length = connssl->encdata_offset +
+ CURL_SCHANNEL_BUFFER_FREE_SIZE;
+ /* make sure that the requested amount of data fits */
+ if(reallocated_length < len) {
+ reallocated_length = len;
+ }
+ reallocated_buffer = realloc(connssl->encdata_buffer,
+ reallocated_length);
+
+ if(reallocated_buffer == NULL) {
+ failf(data, "schannel: unable to re-allocate memory");
+ *err = CURLE_OUT_OF_MEMORY;
+ return -1;
+ }
+ else {
+ connssl->encdata_buffer = reallocated_buffer;
+ connssl->encdata_length = reallocated_length;
+ }
+ }
+
+ /* read encrypted data from socket */
+ infof(data, "schannel: encrypted data buffer: offset %zu length %zu\n",
+ connssl->encdata_offset, connssl->encdata_length);
+ size = connssl->encdata_length - connssl->encdata_offset;
+ if(size > 0) {
+ *err = Curl_read_plain(conn->sock[sockindex],
+ (char *) (connssl->encdata_buffer + connssl->encdata_offset),
+ size, &nread);
+ /* check for received data */
+ if(*err != CURLE_OK)
+ ret = -1;
+ else {
+ if(nread > 0)
+ /* increase encrypted data buffer offset */
+ connssl->encdata_offset += nread;
+ ret = nread;
+ }
+ infof(data, "schannel: encrypted data got %zd\n", ret);
+ }
+
+ infof(data, "schannel: encrypted data buffer: offset %zu length %zu\n",
+ connssl->encdata_offset, connssl->encdata_length);
+
+ /* check if we still have some data in our buffers */
+ while(connssl->encdata_offset > 0 && sspi_status == SEC_E_OK &&
+ connssl->decdata_offset < len) {
+ /* 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);
+
+ /* http://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 we need more data */
+ if(sspi_status == SEC_E_INCOMPLETE_MESSAGE) {
+ infof(data, "schannel: failed to decrypt data, need more data\n");
+ *err = CURLE_AGAIN;
+ return -1;
+ }
+
+ /* 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) {
+ failf(data, "schannel: unable to re-allocate memory");
+ *err = CURLE_OUT_OF_MEMORY;
+ return -1;
+ }
+ else {
+ connssl->decdata_buffer = reallocated_buffer;
+ connssl->decdata_length = reallocated_length;
+ }
+ }
+
+ /* copy decrypted data to internal buffer */
+ size = inbuf[1].cbBuffer;
+ if(size > 0) {
+ 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 SSL/TLS renegotiation\n");
+
+ /* begin renegotiation */
+ infof(data, "schannel: renegotiating SSL/TLS connection\n");
+ connssl->state = ssl_connection_negotiating;
+ connssl->connecting_state = ssl_connect_2_writing;
+ result = schannel_connect_common(conn, sockindex, FALSE, &done);
+ if(result)
+ *err = result;
+ else {
+ infof(data, "schannel: SSL/TLS connection renegotiated\n");
+ /* now retry receiving data */
+ return schannel_recv(conn, sockindex, buf, len, err);
+ }
+ }
+ }
+
+ infof(data, "schannel: decrypted data buffer: offset %zu length %zu\n",
+ connssl->decdata_offset, connssl->decdata_length);
+
+ /* copy requested decrypted data to supplied buffer */
+ size = len < connssl->decdata_offset ? len : connssl->decdata_offset;
+ if(size > 0) {
+ memcpy(buf, connssl->decdata_buffer, size);
+ ret = size;
+
+ /* move remaining decrypted data forward to the beginning of buffer */
+ memmove(connssl->decdata_buffer, connssl->decdata_buffer + size,
+ connssl->decdata_offset - size);
+ connssl->decdata_offset -= size;
+
+ infof(data, "schannel: decrypted data returned %zd\n", size);
+ infof(data, "schannel: decrypted data buffer: offset %zu length %zu\n",
+ connssl->decdata_offset, connssl->decdata_length);
+ }
+ else
+ ret = 0;
+
+ /* check if the server closed the connection */
+ if(ret <= 0 && ( /* special check for Windows 2000 Professional */
+ sspi_status == SEC_I_CONTEXT_EXPIRED || (sspi_status == SEC_E_OK &&
+ connssl->encdata_offset > 0 && connssl->encdata_buffer[0] == 0x15))) {
+ infof(data, "schannel: server closed the connection\n");
+ *err = CURLE_OK;
+ return 0;
+ }
+
+ /* check if something went wrong and we need to return an error */
+ if(ret < 0 && sspi_status != SEC_E_OK) {
+ infof(data, "schannel: failed to read data from server: %s\n",
+ Curl_sspi_strerror(conn, sspi_status));
+ *err = CURLE_RECV_ERROR;
+ return -1;
+ }
+
+ return ret;
+}
+
+CURL_STATIC CURLcode
+Curl_schannel_connect_nonblocking(struct connectdata *conn, int sockindex,
+ bool *done)
+{
+ return schannel_connect_common(conn, sockindex, TRUE, done);
+}
+
+CURL_STATIC 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;
+}
+
+CURL_STATIC 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;
+}
+
+CURL_STATIC 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);
+}
+
+CURL_STATIC int Curl_schannel_shutdown(struct connectdata *conn, int sockindex)
+{
+ /* See http://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;
+}
+
+CURL_STATIC 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;
+ }
+ }
+}
+
+CURL_STATIC int Curl_schannel_init(void)
+{
+ return (Curl_sspi_global_init() == CURLE_OK ? 1 : 0);
+}
+
+CURL_STATIC void Curl_schannel_cleanup(void)
+{
+ Curl_sspi_global_cleanup();
+}
+
+CURL_STATIC size_t Curl_schannel_version(char *buffer, size_t size)
+{
+ size = snprintf(buffer, size, "WinSSL");
+
+ return size;
+}
+
+CURL_STATIC 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,
+ 0,
+ 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|
+ CERT_TRUST_REVOCATION_STATUS_UNKNOWN);
+ dwTrustErrorMask &= pSimpleChain->TrustStatus.dwErrorStatus;
+ if(dwTrustErrorMask) {
+ if(dwTrustErrorMask & CERT_TRUST_IS_PARTIAL_CHAIN)
+ failf(data, "schannel: CertGetCertificateChain trust error"
+ " CERT_TRUST_IS_PARTIAL_CHAIN");
+ if(dwTrustErrorMask & CERT_TRUST_IS_UNTRUSTED_ROOT)
+ failf(data, "schannel: CertGetCertificateChain trust error"
+ " CERT_TRUST_IS_UNTRUSTED_ROOT");
+ if(dwTrustErrorMask & CERT_TRUST_IS_NOT_TIME_VALID)
+ failf(data, "schannel: CertGetCertificateChain trust error"
+ " CERT_TRUST_IS_NOT_TIME_VALID");
+ 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);
+
+ 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 */
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