1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 2012, Marc Hoersken, <info@marc-hoersken.de>, et al.
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at http://curl.haxx.se/docs/copyright.html.
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
21 ***************************************************************************/
24 * Source file for all SChannel-specific code for the TLS/SSL layer. No code
25 * but sslgen.c should ever call or use these functions.
30 * Based upon the PolarSSL implementation in polarssl.c and polarssl.h:
31 * Copyright (C) 2010, 2011, Hoi-Ho Chan, <hoiho.chan@gmail.com>
33 * Based upon the CyaSSL implementation in cyassl.c and cyassl.h:
34 * Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al.
36 * Thanks for code and inspiration!
40 * TODO list for TLS/SSL implementation:
41 * - implement write buffering
42 * - implement SSL/TLS shutdown
43 * - implement client certificate authentication
44 * - implement custom server certificate validation
45 * - implement cipher/algorithm option
47 * Related articles on MSDN:
48 * - Getting a Certificate for Schannel
49 * http://msdn.microsoft.com/en-us/library/windows/desktop/aa375447.aspx
50 * - Specifying Schannel Ciphers and Cipher Strengths
51 * http://msdn.microsoft.com/en-us/library/windows/desktop/aa380161.aspx
56 #ifdef USE_WINDOWS_SSPI
59 #include "curl_sspi.h"
60 #include "curl_schannel.h"
63 #include "connect.h" /* for the connect timeout */
64 #include "select.h" /* for the socket readyness */
65 #include "inet_pton.h" /* for IP addr SNI check */
67 #define _MPRINTF_REPLACE /* use our functions only */
68 #include <curl/mprintf.h>
69 #include "curl_memory.h"
70 /* The last #include file should be: */
73 /* Uncomment to force verbose output
74 * #define infof(x, y, ...) printf(y, __VA_ARGS__)
75 * #define failf(x, y, ...) printf(y, __VA_ARGS__)
78 static Curl_recv schannel_recv;
79 static Curl_send schannel_send;
82 schannel_connect_step1(struct connectdata *conn, int sockindex) {
84 struct SessionHandle *data = conn->data;
85 struct ssl_connect_data* connssl = &conn->ssl[sockindex];
87 SecBufferDesc outbuf_desc;
88 SCHANNEL_CRED schannel_cred;
89 SECURITY_STATUS sspi_status = SEC_E_OK;
90 curl_schannel_cred *old_cred = NULL;
91 char *sspi_msg = NULL;
94 struct in6_addr addr6;
97 infof(data, "schannel: connecting to %s:%d (step 1/3)\n",
98 conn->host.name, conn->remote_port);
100 /* check for an existing re-usable credential handle */
101 if(!Curl_ssl_getsessionid(conn, (void**)&old_cred, NULL)) {
102 connssl->cred = old_cred;
103 infof(data, "schannel: re-using existing credential handle\n");
106 /* setup Schannel API options */
107 memset(&schannel_cred, 0, sizeof(schannel_cred));
108 schannel_cred.dwVersion = SCHANNEL_CRED_VERSION;
110 if(data->set.ssl.verifypeer) {
111 schannel_cred.dwFlags = SCH_CRED_AUTO_CRED_VALIDATION |
112 SCH_CRED_REVOCATION_CHECK_CHAIN;
113 infof(data, "schannel: checking server certificate and revocation\n");
116 schannel_cred.dwFlags = SCH_CRED_MANUAL_CRED_VALIDATION |
117 SCH_CRED_IGNORE_NO_REVOCATION_CHECK |
118 SCH_CRED_IGNORE_REVOCATION_OFFLINE;
119 infof(data, "schannel: disable server certificate and revocation checks\n");
122 if(Curl_inet_pton(AF_INET, conn->host.name, &addr) ||
124 Curl_inet_pton(AF_INET6, conn->host.name, &addr6) ||
126 data->set.ssl.verifyhost < 2) {
127 schannel_cred.dwFlags |= SCH_CRED_NO_SERVERNAME_CHECK;
128 infof(data, "schannel: using IP address, disable SNI servername check\n");
131 switch(data->set.ssl.version) {
132 case CURL_SSLVERSION_TLSv1:
133 schannel_cred.grbitEnabledProtocols = SP_PROT_TLS1_0_CLIENT |
134 SP_PROT_TLS1_1_CLIENT |
135 SP_PROT_TLS1_2_CLIENT;
137 case CURL_SSLVERSION_SSLv3:
138 schannel_cred.grbitEnabledProtocols = SP_PROT_SSL3_CLIENT;
140 case CURL_SSLVERSION_SSLv2:
141 schannel_cred.grbitEnabledProtocols = SP_PROT_SSL2_CLIENT;
145 /* allocate memory for the re-usable credential handle */
146 connssl->cred = malloc(sizeof(curl_schannel_cred));
147 if (!connssl->cred) {
148 failf(data, "schannel: unable to allocate memory");
149 return CURLE_OUT_OF_MEMORY;
151 memset(connssl->cred, 0, sizeof(curl_schannel_cred));
153 /* http://msdn.microsoft.com/en-us/library/windows/desktop/aa374716.aspx */
154 sspi_status = s_pSecFn->AcquireCredentialsHandle(NULL,
155 UNISP_NAME, SECPKG_CRED_OUTBOUND, NULL, &schannel_cred, NULL, NULL,
156 &connssl->cred->cred_handle, &connssl->cred->time_stamp);
158 if(sspi_status != SEC_E_OK) {
159 sspi_msg = Curl_sspi_status_msg(sspi_status);
160 if(sspi_status == SEC_E_WRONG_PRINCIPAL)
161 failf(data, "schannel: SNI or certificate check failed: %s\n",
164 failf(data, "schannel: AcquireCredentialsHandleA failed: %s\n",
168 connssl->cred = NULL;
169 return CURLE_SSL_CONNECT_ERROR;
173 /* setup output buffer */
174 outbuf.pvBuffer = NULL;
176 outbuf.BufferType = SECBUFFER_EMPTY;
178 outbuf_desc.pBuffers = &outbuf;
179 outbuf_desc.cBuffers = 1;
180 outbuf_desc.ulVersion = SECBUFFER_VERSION;
182 /* setup request flags */
183 connssl->req_flags = ISC_REQ_SEQUENCE_DETECT | ISC_REQ_REPLAY_DETECT |
184 ISC_REQ_CONFIDENTIALITY | ISC_REQ_EXTENDED_ERROR |
185 ISC_REQ_ALLOCATE_MEMORY | ISC_REQ_STREAM;
187 /* allocate memory for the security context handle */
188 connssl->ctxt = malloc(sizeof(curl_schannel_ctxt));
189 if (!connssl->ctxt) {
190 failf(data, "schannel: unable to allocate memory");
191 return CURLE_OUT_OF_MEMORY;
193 memset(connssl->ctxt, 0, sizeof(curl_schannel_ctxt));
195 /* http://msdn.microsoft.com/en-us/library/windows/desktop/aa375924.aspx */
196 sspi_status = s_pSecFn->InitializeSecurityContext(
197 &connssl->cred->cred_handle, NULL, conn->host.name,
198 connssl->req_flags, 0, 0, NULL, 0, &connssl->ctxt->ctxt_handle,
199 &outbuf_desc, &connssl->ret_flags, &connssl->ctxt->time_stamp);
201 if(sspi_status != SEC_I_CONTINUE_NEEDED) {
202 sspi_msg = Curl_sspi_status_msg(sspi_status);
203 if(sspi_status == SEC_E_WRONG_PRINCIPAL)
204 failf(data, "schannel: SNI or certificate check failed: %s\n",
207 failf(data, "schannel: initial InitializeSecurityContextA failed: %s\n",
211 connssl->ctxt = NULL;
212 return CURLE_SSL_CONNECT_ERROR;
215 infof(data, "schannel: sending initial handshake data: %d ...\n",
218 /* send initial handshake data which is now stored in output buffer */
219 write = swrite(conn->sock[sockindex], outbuf.pvBuffer, outbuf.cbBuffer);
220 s_pSecFn->FreeContextBuffer(outbuf.pvBuffer);
221 if(write != outbuf.cbBuffer) {
222 failf(data, "schannel: failed to send initial handshake data: %d\n", write);
223 return CURLE_SSL_CONNECT_ERROR;
226 infof(data, "schannel: sent initial handshake data: %d\n", write);
228 /* continue to second handshake step */
229 connssl->connecting_state = ssl_connect_2;
235 schannel_connect_step2(struct connectdata *conn, int sockindex) {
237 ssize_t read = -1, write = -1;
238 struct SessionHandle *data = conn->data;
239 struct ssl_connect_data* connssl = &conn->ssl[sockindex];
241 SecBufferDesc outbuf_desc;
243 SecBufferDesc inbuf_desc;
244 SECURITY_STATUS sspi_status = SEC_E_OK;
245 char *sspi_msg = NULL;
247 infof(data, "schannel: connecting to %s:%d (step 2/3)\n",
248 conn->host.name, conn->remote_port);
250 /* buffer to store previously received and encrypted data */
251 if(connssl->encdata_buffer == NULL) {
252 connssl->encdata_offset = 0;
253 connssl->encdata_length = 4096;
254 connssl->encdata_buffer = malloc(connssl->encdata_length);
255 if(connssl->encdata_buffer == NULL) {
256 failf(data, "schannel: unable to allocate memory");
257 return CURLE_OUT_OF_MEMORY;
261 /* read encrypted handshake data from socket */
262 read = sread(conn->sock[sockindex],
263 connssl->encdata_buffer + connssl->encdata_offset,
264 connssl->encdata_length - connssl->encdata_offset);
266 /* increase encrypted data buffer offset */
267 connssl->encdata_offset += read;
269 else if(connssl->connecting_state != ssl_connect_2_writing) {
271 connssl->connecting_state = ssl_connect_2_reading;
272 infof(data, "schannel: failed to receive handshake, need more data\n");
276 failf(data, "schannel: failed to receive handshake, connection failed\n");
277 return CURLE_SSL_CONNECT_ERROR;
281 infof(data, "schannel: encrypted data buffer %d/%d\n",
282 connssl->encdata_offset, connssl->encdata_length);
284 /* setup input buffers */
285 inbuf[0].pvBuffer = malloc(connssl->encdata_offset);
286 inbuf[0].cbBuffer = connssl->encdata_offset;
287 inbuf[0].BufferType = SECBUFFER_TOKEN;
289 inbuf[1].pvBuffer = NULL;
290 inbuf[1].cbBuffer = 0;
291 inbuf[1].BufferType = SECBUFFER_EMPTY;
293 inbuf_desc.pBuffers = &inbuf[0];
294 inbuf_desc.cBuffers = 2;
295 inbuf_desc.ulVersion = SECBUFFER_VERSION;
297 /* setup output buffers */
298 outbuf[0].pvBuffer = NULL;
299 outbuf[0].cbBuffer = 0;
300 outbuf[0].BufferType = SECBUFFER_TOKEN;
302 outbuf[1].pvBuffer = NULL;
303 outbuf[1].cbBuffer = 0;
304 outbuf[1].BufferType = SECBUFFER_ALERT;
306 outbuf_desc.pBuffers = &outbuf[0];
307 outbuf_desc.cBuffers = 2;
308 outbuf_desc.ulVersion = SECBUFFER_VERSION;
310 if(inbuf[0].pvBuffer == NULL) {
311 failf(data, "schannel: unable to allocate memory");
312 return CURLE_OUT_OF_MEMORY;
315 /* copy received handshake data into input buffer */
316 memcpy(inbuf[0].pvBuffer, connssl->encdata_buffer, connssl->encdata_offset);
318 /* http://msdn.microsoft.com/en-us/library/windows/desktop/aa375924.aspx */
319 sspi_status = s_pSecFn->InitializeSecurityContext(
320 &connssl->cred->cred_handle, &connssl->ctxt->ctxt_handle,
321 conn->host.name, connssl->req_flags, 0, 0, &inbuf_desc, 0, NULL,
322 &outbuf_desc, &connssl->ret_flags, &connssl->ctxt->time_stamp);
324 /* free buffer for received handshake data */
325 free(inbuf[0].pvBuffer);
327 /* check if the handshake was incomplete */
328 if(sspi_status == SEC_E_INCOMPLETE_MESSAGE) {
329 connssl->connecting_state = ssl_connect_2_reading;
330 infof(data, "schannel: received incomplete message, need more data\n");
334 /* check if the handshake needs to be continued */
335 if(sspi_status == SEC_I_CONTINUE_NEEDED || sspi_status == SEC_E_OK) {
336 for(i = 0; i < 2; i++) {
337 /* search for handshake tokens that need to be send */
338 if(outbuf[i].BufferType == SECBUFFER_TOKEN && outbuf[i].cbBuffer > 0) {
339 infof(data, "schannel: sending next handshake data: %d ...\n",
342 /* send handshake token to server */
343 write = swrite(conn->sock[sockindex],
344 outbuf[i].pvBuffer, outbuf[i].cbBuffer);
345 if(write != outbuf[i].cbBuffer) {
346 failf(data, "schannel: failed to send next handshake data: %d\n",
348 return CURLE_SSL_CONNECT_ERROR;
352 /* free obsolete buffer */
353 if(outbuf[i].pvBuffer != NULL) {
354 s_pSecFn->FreeContextBuffer(outbuf[i].pvBuffer);
359 sspi_msg = Curl_sspi_status_msg(sspi_status);
360 if(sspi_status == SEC_E_WRONG_PRINCIPAL)
361 failf(data, "schannel: SNI or certificate check failed: %s\n",
364 failf(data, "schannel: next InitializeSecurityContextA failed: %s\n",
367 return CURLE_SSL_CONNECT_ERROR;
370 /* check if there was additional remaining encrypted data */
371 if(inbuf[1].BufferType == SECBUFFER_EXTRA && inbuf[1].cbBuffer > 0) {
372 infof(data, "schannel: encrypted data length: %d\n", inbuf[1].cbBuffer);
374 /* check if the remaining data is less than the total amount
375 * and therefore begins after the already processed data
377 if(connssl->encdata_offset > inbuf[1].cbBuffer) {
378 memmove(connssl->encdata_buffer,
379 (connssl->encdata_buffer + connssl->encdata_offset) -
380 inbuf[1].cbBuffer, inbuf[1].cbBuffer);
381 connssl->encdata_offset = inbuf[1].cbBuffer;
385 connssl->encdata_offset = 0;
388 /* check if the handshake needs to be continued */
389 if(sspi_status == SEC_I_CONTINUE_NEEDED) {
390 connssl->connecting_state = ssl_connect_2_reading;
394 /* check if the handshake is complete */
395 if(sspi_status == SEC_E_OK) {
396 connssl->connecting_state = ssl_connect_3;
397 infof(data, "schannel: handshake complete\n");
404 schannel_connect_step3(struct connectdata *conn, int sockindex) {
405 CURLcode retcode = CURLE_OK;
406 struct SessionHandle *data = conn->data;
407 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
408 curl_schannel_cred *old_cred = NULL;
411 DEBUGASSERT(ssl_connect_3 == connssl->connecting_state);
413 infof(data, "schannel: connecting to %s:%d (step 3/3)\n",
414 conn->host.name, conn->remote_port);
416 /* check if the required context attributes are met */
417 if(connssl->ret_flags != connssl->req_flags) {
418 if(!(connssl->ret_flags & ISC_RET_SEQUENCE_DETECT))
419 failf(data, "schannel: failed to setup sequence detection\n");
420 if(!(connssl->ret_flags & ISC_RET_REPLAY_DETECT))
421 failf(data, "schannel: failed to setup replay detection\n");
422 if(!(connssl->ret_flags & ISC_RET_CONFIDENTIALITY))
423 failf(data, "schannel: failed to setup confidentiality\n");
424 if(!(connssl->ret_flags & ISC_RET_EXTENDED_ERROR))
425 failf(data, "schannel: failed to setup extended errors\n");
426 if(!(connssl->ret_flags & ISC_RET_ALLOCATED_MEMORY))
427 failf(data, "schannel: failed to setup memory allocation\n");
428 if(!(connssl->ret_flags & ISC_RET_STREAM))
429 failf(data, "schannel: failed to setup stream orientation\n");
430 return CURLE_SSL_CONNECT_ERROR;
433 /* save the current session data for possible re-use */
434 incache = !(Curl_ssl_getsessionid(conn, (void**)&old_cred, NULL));
436 if(old_cred != connssl->cred) {
437 infof(data, "schannel: old credential handle is stale, removing\n");
438 Curl_ssl_delsessionid(conn, (void*)old_cred);
443 retcode = Curl_ssl_addsessionid(conn, (void*)connssl->cred,
444 sizeof(curl_schannel_cred));
446 failf(data, "schannel: failed to store credential handle\n");
450 infof(data, "schannel: stored crendential handle\n");
454 connssl->connecting_state = ssl_connect_done;
460 schannel_connect_common(struct connectdata *conn, int sockindex,
461 bool nonblocking, bool *done) {
463 struct SessionHandle *data = conn->data;
464 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
465 curl_socket_t sockfd = conn->sock[sockindex];
469 /* check if the connection has already been established */
470 if(ssl_connection_complete == connssl->state) {
475 if(ssl_connect_1 == connssl->connecting_state) {
476 /* check out how much more time we're allowed */
477 timeout_ms = Curl_timeleft(data, NULL, TRUE);
480 /* no need to continue if time already is up */
481 failf(data, "SSL connection timeout");
482 return CURLE_OPERATION_TIMEDOUT;
485 retcode = schannel_connect_step1(conn, sockindex);
490 while(ssl_connect_2 == connssl->connecting_state ||
491 ssl_connect_2_reading == connssl->connecting_state ||
492 ssl_connect_2_writing == connssl->connecting_state) {
494 /* check out how much more time we're allowed */
495 timeout_ms = Curl_timeleft(data, NULL, TRUE);
498 /* no need to continue if time already is up */
499 failf(data, "SSL connection timeout");
500 return CURLE_OPERATION_TIMEDOUT;
503 /* if ssl is expecting something, check if it's available. */
504 if(connssl->connecting_state == ssl_connect_2_reading
505 || connssl->connecting_state == ssl_connect_2_writing) {
507 curl_socket_t writefd = ssl_connect_2_writing ==
508 connssl->connecting_state ? sockfd : CURL_SOCKET_BAD;
509 curl_socket_t readfd = ssl_connect_2_reading ==
510 connssl->connecting_state ? sockfd : CURL_SOCKET_BAD;
512 what = Curl_socket_ready(readfd, writefd, nonblocking ? 0 : timeout_ms);
515 failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
516 return CURLE_SSL_CONNECT_ERROR;
525 failf(data, "SSL connection timeout");
526 return CURLE_OPERATION_TIMEDOUT;
529 /* socket is readable or writable */
532 /* Run transaction, and return to the caller if it failed or if
533 * this connection is part of a multi handle and this loop would
534 * execute again. This permits the owner of a multi handle to
535 * abort a connection attempt before step2 has completed while
536 * ensuring that a client using select() or epoll() will always
537 * have a valid fdset to wait on.
539 retcode = schannel_connect_step2(conn, sockindex);
540 if(retcode || (nonblocking &&
541 (ssl_connect_2 == connssl->connecting_state ||
542 ssl_connect_2_reading == connssl->connecting_state ||
543 ssl_connect_2_writing == connssl->connecting_state)))
546 } /* repeat step2 until all transactions are done. */
548 if(ssl_connect_3 == connssl->connecting_state) {
549 retcode = schannel_connect_step3(conn, sockindex);
554 if(ssl_connect_done == connssl->connecting_state) {
555 connssl->state = ssl_connection_complete;
556 conn->recv[sockindex] = schannel_recv;
557 conn->send[sockindex] = schannel_send;
563 /* reset our connection state machine */
564 connssl->connecting_state = ssl_connect_1;
570 schannel_send(struct connectdata *conn, int sockindex,
571 const void *buf, size_t len, CURLcode *err) {
574 unsigned char *data = NULL;
575 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
577 SecBufferDesc outbuf_desc;
578 SECURITY_STATUS sspi_status = SEC_E_OK;
580 /* check if the maximum stream sizes were queried */
581 if(connssl->stream_sizes.cbMaximumMessage == 0) {
582 sspi_status = s_pSecFn->QueryContextAttributes(
583 &connssl->ctxt->ctxt_handle,
584 SECPKG_ATTR_STREAM_SIZES, &connssl->stream_sizes);
585 if(sspi_status != SEC_E_OK) {
586 *err = CURLE_SEND_ERROR;
591 /* check if the buffer is longer than the maximum message length */
592 if(len > connssl->stream_sizes.cbMaximumMessage) {
593 *err = CURLE_SEND_ERROR;
597 /* calculate the complete message length and allocate a buffer for it */
598 data_len = connssl->stream_sizes.cbHeader + len +
599 connssl->stream_sizes.cbTrailer;
600 data = (unsigned char*) malloc(data_len);
602 *err = CURLE_OUT_OF_MEMORY;
606 /* setup output buffers (header, data, trailer, empty) */
607 outbuf[0].pvBuffer = data;
608 outbuf[0].cbBuffer = connssl->stream_sizes.cbHeader;
609 outbuf[0].BufferType = SECBUFFER_STREAM_HEADER;
611 outbuf[1].pvBuffer = data + connssl->stream_sizes.cbHeader;
612 outbuf[1].cbBuffer = len;
613 outbuf[1].BufferType = SECBUFFER_DATA;
615 outbuf[2].pvBuffer = data + connssl->stream_sizes.cbHeader + len;
616 outbuf[2].cbBuffer = connssl->stream_sizes.cbTrailer;
617 outbuf[2].BufferType = SECBUFFER_STREAM_TRAILER;
619 outbuf[3].pvBuffer = NULL;
620 outbuf[3].cbBuffer = 0;
621 outbuf[3].BufferType = SECBUFFER_EMPTY;
623 outbuf_desc.pBuffers = &outbuf[0];
624 outbuf_desc.cBuffers = 4;
625 outbuf_desc.ulVersion = SECBUFFER_VERSION;
627 /* copy data into output buffer */
628 memcpy(outbuf[1].pvBuffer, buf, len);
630 /* http://msdn.microsoft.com/en-us/library/windows/desktop/aa375390.aspx */
631 sspi_status = s_pSecFn->EncryptMessage(&connssl->ctxt->ctxt_handle, 0,
634 /* check if the message was encrypted */
635 if(sspi_status == SEC_E_OK) {
636 /* send the encrypted message including header, data and trailer */
637 len = outbuf[0].cbBuffer + outbuf[1].cbBuffer + outbuf[2].cbBuffer;
638 ret = swrite(conn->sock[sockindex], data, len);
639 /* TODO: implement write buffering */
641 else if(sspi_status == SEC_E_INSUFFICIENT_MEMORY) {
642 *err = CURLE_OUT_OF_MEMORY;
645 *err = CURLE_SEND_ERROR;
654 schannel_recv(struct connectdata *conn, int sockindex,
655 char *buf, size_t len, CURLcode *err) {
657 ssize_t read = 0, ret = -1;
659 struct SessionHandle *data = conn->data;
660 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
663 SecBufferDesc inbuf_desc;
664 SECURITY_STATUS sspi_status = SEC_E_OK;
665 char *sspi_msg = NULL;
667 infof(data, "schannel: client wants to read %d\n", len);
670 /* buffer to store previously received and decrypted data */
671 if(connssl->decdata_buffer == NULL) {
672 connssl->decdata_offset = 0;
673 connssl->decdata_length = 4096;
674 connssl->decdata_buffer = malloc(connssl->decdata_length);
675 if(connssl->decdata_buffer == NULL) {
676 failf(data, "schannel: unable to allocate memory");
677 return CURLE_OUT_OF_MEMORY;
681 /* increase buffer in order to fit the requested amount of data */
682 while(connssl->encdata_length - connssl->encdata_offset < 2048 ||
683 connssl->encdata_length < len) {
684 /* increase internal encrypted data buffer */
685 connssl->encdata_length += 2048;
686 connssl->encdata_buffer = realloc(connssl->encdata_buffer,
687 connssl->encdata_length);
688 if(connssl->encdata_buffer == NULL) {
689 failf(data, "schannel: unable to re-allocate memory");
690 *err = CURLE_OUT_OF_MEMORY;
695 /* read encrypted data from socket */
696 infof(data, "schannel: encrypted data buffer %d/%d\n",
697 connssl->encdata_offset, connssl->encdata_length);
698 size = connssl->encdata_length - connssl->encdata_offset;
700 read = sread(conn->sock[sockindex],
701 connssl->encdata_buffer + connssl->encdata_offset, size);
702 infof(data, "schannel: encrypted data received %d\n", read);
704 /* check for received data */
706 /* increase encrypted data buffer offset */
707 connssl->encdata_offset += read;
709 else if(connssl->encdata_offset == 0) {
717 infof(data, "schannel: encrypted data buffer %d/%d\n",
718 connssl->encdata_offset, connssl->encdata_length);
720 /* check if we still have some data in our buffers */
721 while(connssl->encdata_offset > 0 && sspi_status == SEC_E_OK) {
722 /* prepare data buffer for DecryptMessage call */
723 inbuf[0].pvBuffer = connssl->encdata_buffer;
724 inbuf[0].cbBuffer = connssl->encdata_offset;
725 inbuf[0].BufferType = SECBUFFER_DATA;
727 /* we need 3 more empty input buffers for possible output */
728 inbuf[1].pvBuffer = NULL;
729 inbuf[1].cbBuffer = 0;
730 inbuf[1].BufferType = SECBUFFER_EMPTY;
732 inbuf[2].pvBuffer = NULL;
733 inbuf[2].cbBuffer = 0;
734 inbuf[2].BufferType = SECBUFFER_EMPTY;
736 inbuf[3].pvBuffer = NULL;
737 inbuf[3].cbBuffer = 0;
738 inbuf[3].BufferType = SECBUFFER_EMPTY;
740 inbuf_desc.pBuffers = &inbuf[0];
741 inbuf_desc.cBuffers = 4;
742 inbuf_desc.ulVersion = SECBUFFER_VERSION;
744 /* http://msdn.microsoft.com/en-us/library/windows/desktop/aa375348.aspx */
745 sspi_status = s_pSecFn->DecryptMessage(&connssl->ctxt->ctxt_handle,
746 &inbuf_desc, 0, NULL);
748 /* check if we need more data */
749 if(sspi_status == SEC_E_INCOMPLETE_MESSAGE) {
750 infof(data, "schannel: failed to decrypt data, need more data\n");
755 /* check if everything went fine (server may want to renegotiate context) */
756 if(sspi_status == SEC_E_OK || sspi_status == SEC_I_RENEGOTIATE ||
757 sspi_status == SEC_I_CONTEXT_EXPIRED) {
758 /* check for successfully decrypted data */
759 if(inbuf[1].BufferType == SECBUFFER_DATA) {
760 infof(data, "schannel: decrypted data length: %d\n", inbuf[1].cbBuffer);
762 /* increase buffer in order to fit the received amount of data */
763 size = inbuf[1].cbBuffer > 2048 ? inbuf[1].cbBuffer : 2048;
764 while(connssl->decdata_length - connssl->decdata_offset < size ||
765 connssl->decdata_length < len) {
766 /* increase internal decrypted data buffer */
767 connssl->decdata_length += size;
768 connssl->decdata_buffer = realloc(connssl->decdata_buffer,
769 connssl->decdata_length);
770 if(connssl->decdata_buffer == NULL) {
771 failf(data, "schannel: unable to re-allocate memory");
772 *err = CURLE_OUT_OF_MEMORY;
777 /* copy decrypted data to internal buffer */
778 size = inbuf[1].cbBuffer;
780 memcpy(connssl->decdata_buffer + connssl->decdata_offset,
781 inbuf[1].pvBuffer, size);
782 connssl->decdata_offset += size;
785 infof(data, "schannel: decrypted data added: %d\n", size);
786 infof(data, "schannel: decrypted data cached: %d/%d\n",
787 connssl->decdata_offset, connssl->decdata_length);
790 /* check for remaining encrypted data */
791 if(inbuf[3].BufferType == SECBUFFER_EXTRA && inbuf[3].cbBuffer > 0) {
792 infof(data, "schannel: encrypted data length: %d\n", inbuf[3].cbBuffer);
794 /* check if the remaining data is less than the total amount
795 * and therefore begins after the already processed data
797 if(connssl->encdata_offset > inbuf[3].cbBuffer) {
798 /* move remaining encrypted data forward to the beginning of buffer */
799 memmove(connssl->encdata_buffer,
800 (connssl->encdata_buffer + connssl->encdata_offset) -
801 inbuf[3].cbBuffer, inbuf[3].cbBuffer);
802 connssl->encdata_offset = inbuf[3].cbBuffer;
805 infof(data, "schannel: encrypted data cached: %d/%d\n",
806 connssl->encdata_offset, connssl->encdata_length);
809 /* reset encrypted buffer offset, because there is no data remaining */
810 connssl->encdata_offset = 0;
814 /* check if server wants to renegotiate the connection context */
815 if(sspi_status == SEC_I_RENEGOTIATE) {
816 infof(data, "schannel: client needs to renegotiate with server\n");
818 /* begin renegotiation */
819 connssl->state = ssl_connection_negotiating;
820 connssl->connecting_state = ssl_connect_2_writing;
821 retcode = schannel_connect_common(conn, sockindex, FALSE, &done);
824 else /* now retry receiving data */
825 return schannel_recv(conn, sockindex, buf, len, err);
829 /* copy requested decrypted data to supplied buffer */
830 size = len < connssl->decdata_offset ? len : connssl->decdata_offset;
832 memcpy(buf, connssl->decdata_buffer, size);
835 /* move remaining decrypted data forward to the beginning of buffer */
836 memmove(connssl->decdata_buffer, connssl->decdata_buffer + size,
837 connssl->decdata_offset - size);
838 connssl->decdata_offset -= size;
841 /* reduce internal buffer length to reduce memory usage */
842 if(connssl->encdata_length > 4096) {
843 connssl->encdata_length = connssl->encdata_offset > 4096 ?
844 connssl->encdata_offset : 4096;
845 connssl->encdata_buffer = realloc(connssl->encdata_buffer,
846 connssl->encdata_length);
848 if(connssl->decdata_length > 4096) {
849 connssl->decdata_length = connssl->decdata_offset > 4096 ?
850 connssl->decdata_offset : 4096;
851 connssl->decdata_buffer = realloc(connssl->decdata_buffer,
852 connssl->decdata_length);
855 /* check if the server closed the connection */
856 if(ret <= 0 && ( /* special check for Windows 2000 Professional */
857 sspi_status == SEC_I_CONTEXT_EXPIRED || (sspi_status == SEC_E_OK &&
858 connssl->encdata_offset > 0 && connssl->encdata_buffer[0] == 0x15))) {
859 infof(data, "schannel: server closed the connection\n");
864 /* check if something went wrong and we need to return an error */
865 if(ret < 0 && sspi_status != SEC_E_OK) {
866 sspi_msg = Curl_sspi_status_msg(sspi_status);
867 infof(data, "schannel: failed to read data from server: %s\n", sspi_msg);
869 *err = CURLE_RECV_ERROR;
877 Curl_schannel_connect_nonblocking(struct connectdata *conn, int sockindex,
879 return schannel_connect_common(conn, sockindex, TRUE, done);
883 Curl_schannel_connect(struct connectdata *conn, int sockindex) {
887 retcode = schannel_connect_common(conn, sockindex, FALSE, &done);
896 bool Curl_schannel_data_pending(const struct connectdata *conn, int sockindex) {
897 const struct ssl_connect_data *connssl = &conn->ssl[sockindex];
899 if(connssl->use) /* SSL is in use */
900 return (connssl->encdata_offset > 0 ||
901 connssl->decdata_offset > 0 ) ? TRUE : FALSE;
906 void Curl_schannel_close(struct connectdata *conn, int sockindex) {
907 struct SessionHandle *data = conn->data;
908 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
910 infof(data, "schannel: Closing connection with %s:%d\n",
911 conn->host.name, conn->remote_port);
913 /* free SSPI Schannel API security context handle */
915 s_pSecFn->DeleteSecurityContext(&connssl->ctxt->ctxt_handle);
917 connssl->ctxt = NULL;
920 /* free internal buffer for received encrypted data */
921 if(connssl->encdata_buffer != NULL) {
922 free(connssl->encdata_buffer);
923 connssl->encdata_buffer = NULL;
924 connssl->encdata_length = 0;
925 connssl->encdata_offset = 0;
928 /* free internal buffer for received decrypted data */
929 if(connssl->decdata_buffer != NULL) {
930 free(connssl->decdata_buffer);
931 connssl->decdata_buffer = NULL;
932 connssl->decdata_length = 0;
933 connssl->decdata_offset = 0;
937 int Curl_schannel_shutdown(struct connectdata *conn, int sockindex) {
938 return CURLE_NOT_BUILT_IN; /* TODO: implement SSL/TLS shutdown */
941 void Curl_schannel_session_free(void *ptr) {
942 curl_schannel_cred *cred = ptr;
945 s_pSecFn->FreeCredentialsHandle(&cred->cred_handle);
950 int Curl_schannel_init() {
951 return (Curl_sspi_global_init() == CURLE_OK ? 1 : 0);
954 void Curl_schannel_cleanup() {
955 Curl_sspi_global_cleanup();
958 size_t Curl_schannel_version(char *buffer, size_t size)
960 char* version = Curl_sspi_version();
961 size = snprintf(buffer, size, "Schannel-%s", version);
966 #endif /* USE_SCHANNEL */
967 #endif /* USE_WINDOWS_SSPI */