1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 2012 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
9 * Copyright (C) 2009, 2011, Markus Moeller, <markus_moeller@compuserve.com>
10 *
11 * This software is licensed as described in the file COPYING, which
12 * you should have received as part of this distribution. The terms
13 * are also available at https://curl.haxx.se/docs/copyright.html.
14 *
15 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
16 * copies of the Software, and permit persons to whom the Software is
17 * furnished to do so, under the terms of the COPYING file.
18 *
19 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
20 * KIND, either express or implied.
21 *
22 ***************************************************************************/
23
24 #include "curl_setup.h"
25
26 #if defined(USE_WINDOWS_SSPI) && !defined(CURL_DISABLE_PROXY)
27
28 #include "urldata.h"
29 #include "sendf.h"
30 #include "connect.h"
31 #include "strerror.h"
32 #include "timeval.h"
33 #include "socks.h"
34 #include "curl_sspi.h"
35 #include "curl_multibyte.h"
36 #include "warnless.h"
37 #include "strdup.h"
38 /* The last 3 #include files should be in this order */
39 #include "curl_printf.h"
40 #include "curl_memory.h"
41 #include "memdebug.h"
42
43 /*
44 * Helper sspi error functions.
45 */
check_sspi_err(struct connectdata * conn,SECURITY_STATUS status,const char * function)46 static int check_sspi_err(struct connectdata *conn,
47 SECURITY_STATUS status,
48 const char* function)
49 {
50 if(status != SEC_E_OK &&
51 status != SEC_I_COMPLETE_AND_CONTINUE &&
52 status != SEC_I_COMPLETE_NEEDED &&
53 status != SEC_I_CONTINUE_NEEDED) {
54 failf(conn->data, "SSPI error: %s failed: %s", function,
55 Curl_sspi_strerror(conn, status));
56 return 1;
57 }
58 return 0;
59 }
60
61 /* This is the SSPI-using version of this function */
Curl_SOCKS5_gssapi_negotiate(int sockindex,struct connectdata * conn)62 CURLcode Curl_SOCKS5_gssapi_negotiate(int sockindex,
63 struct connectdata *conn)
64 {
65 struct Curl_easy *data = conn->data;
66 curl_socket_t sock = conn->sock[sockindex];
67 CURLcode code;
68 ssize_t actualread;
69 ssize_t written;
70 int result;
71 /* Needs GSS-API authentication */
72 SECURITY_STATUS status;
73 unsigned long sspi_ret_flags = 0;
74 unsigned char gss_enc;
75 SecBuffer sspi_send_token, sspi_recv_token, sspi_w_token[3];
76 SecBufferDesc input_desc, output_desc, wrap_desc;
77 SecPkgContext_Sizes sspi_sizes;
78 CredHandle cred_handle;
79 CtxtHandle sspi_context;
80 PCtxtHandle context_handle = NULL;
81 SecPkgCredentials_Names names;
82 TimeStamp expiry;
83 char *service_name = NULL;
84 unsigned short us_length;
85 unsigned long qop;
86 unsigned char socksreq[4]; /* room for GSS-API exchange header only */
87 const char *service = data->set.str[STRING_PROXY_SERVICE_NAME] ?
88 data->set.str[STRING_PROXY_SERVICE_NAME] : "rcmd";
89
90 /* GSS-API request looks like
91 * +----+------+-----+----------------+
92 * |VER | MTYP | LEN | TOKEN |
93 * +----+------+----------------------+
94 * | 1 | 1 | 2 | up to 2^16 - 1 |
95 * +----+------+-----+----------------+
96 */
97
98 /* prepare service name */
99 if(strchr(service, '/')) {
100 service_name = strdup(service);
101 if(!service_name)
102 return CURLE_OUT_OF_MEMORY;
103 }
104 else {
105 service_name = malloc(strlen(service) + strlen(conn->proxy.name) + 2);
106 if(!service_name)
107 return CURLE_OUT_OF_MEMORY;
108 snprintf(service_name, strlen(service) +strlen(conn->proxy.name)+2,
109 "%s/%s", service, conn->proxy.name);
110 }
111
112 input_desc.cBuffers = 1;
113 input_desc.pBuffers = &sspi_recv_token;
114 input_desc.ulVersion = SECBUFFER_VERSION;
115
116 sspi_recv_token.BufferType = SECBUFFER_TOKEN;
117 sspi_recv_token.cbBuffer = 0;
118 sspi_recv_token.pvBuffer = NULL;
119
120 output_desc.cBuffers = 1;
121 output_desc.pBuffers = &sspi_send_token;
122 output_desc.ulVersion = SECBUFFER_VERSION;
123
124 sspi_send_token.BufferType = SECBUFFER_TOKEN;
125 sspi_send_token.cbBuffer = 0;
126 sspi_send_token.pvBuffer = NULL;
127
128 wrap_desc.cBuffers = 3;
129 wrap_desc.pBuffers = sspi_w_token;
130 wrap_desc.ulVersion = SECBUFFER_VERSION;
131
132 cred_handle.dwLower = 0;
133 cred_handle.dwUpper = 0;
134
135 status = s_pSecFn->AcquireCredentialsHandle(NULL,
136 (TCHAR *) TEXT("Kerberos"),
137 SECPKG_CRED_OUTBOUND,
138 NULL,
139 NULL,
140 NULL,
141 NULL,
142 &cred_handle,
143 &expiry);
144
145 if(check_sspi_err(conn, status, "AcquireCredentialsHandle")) {
146 failf(data, "Failed to acquire credentials.");
147 free(service_name);
148 s_pSecFn->FreeCredentialsHandle(&cred_handle);
149 return CURLE_COULDNT_CONNECT;
150 }
151
152 /* As long as we need to keep sending some context info, and there's no */
153 /* errors, keep sending it... */
154 for(;;) {
155 TCHAR *sname;
156
157 sname = Curl_convert_UTF8_to_tchar(service_name);
158 if(!sname)
159 return CURLE_OUT_OF_MEMORY;
160
161 status = s_pSecFn->InitializeSecurityContext(&cred_handle,
162 context_handle,
163 sname,
164 ISC_REQ_MUTUAL_AUTH |
165 ISC_REQ_ALLOCATE_MEMORY |
166 ISC_REQ_CONFIDENTIALITY |
167 ISC_REQ_REPLAY_DETECT,
168 0,
169 SECURITY_NATIVE_DREP,
170 &input_desc,
171 0,
172 &sspi_context,
173 &output_desc,
174 &sspi_ret_flags,
175 &expiry);
176
177 Curl_unicodefree(sname);
178
179 if(sspi_recv_token.pvBuffer) {
180 s_pSecFn->FreeContextBuffer(sspi_recv_token.pvBuffer);
181 sspi_recv_token.pvBuffer = NULL;
182 sspi_recv_token.cbBuffer = 0;
183 }
184
185 if(check_sspi_err(conn, status, "InitializeSecurityContext")) {
186 free(service_name);
187 s_pSecFn->FreeCredentialsHandle(&cred_handle);
188 s_pSecFn->DeleteSecurityContext(&sspi_context);
189 if(sspi_recv_token.pvBuffer)
190 s_pSecFn->FreeContextBuffer(sspi_recv_token.pvBuffer);
191 failf(data, "Failed to initialise security context.");
192 return CURLE_COULDNT_CONNECT;
193 }
194
195 if(sspi_send_token.cbBuffer != 0) {
196 socksreq[0] = 1; /* GSS-API subnegotiation version */
197 socksreq[1] = 1; /* authentication message type */
198 us_length = htons((short)sspi_send_token.cbBuffer);
199 memcpy(socksreq+2, &us_length, sizeof(short));
200
201 code = Curl_write_plain(conn, sock, (char *)socksreq, 4, &written);
202 if(code || (4 != written)) {
203 failf(data, "Failed to send SSPI authentication request.");
204 free(service_name);
205 if(sspi_send_token.pvBuffer)
206 s_pSecFn->FreeContextBuffer(sspi_send_token.pvBuffer);
207 if(sspi_recv_token.pvBuffer)
208 s_pSecFn->FreeContextBuffer(sspi_recv_token.pvBuffer);
209 s_pSecFn->FreeCredentialsHandle(&cred_handle);
210 s_pSecFn->DeleteSecurityContext(&sspi_context);
211 return CURLE_COULDNT_CONNECT;
212 }
213
214 code = Curl_write_plain(conn, sock, (char *)sspi_send_token.pvBuffer,
215 sspi_send_token.cbBuffer, &written);
216 if(code || (sspi_send_token.cbBuffer != (size_t)written)) {
217 failf(data, "Failed to send SSPI authentication token.");
218 free(service_name);
219 if(sspi_send_token.pvBuffer)
220 s_pSecFn->FreeContextBuffer(sspi_send_token.pvBuffer);
221 if(sspi_recv_token.pvBuffer)
222 s_pSecFn->FreeContextBuffer(sspi_recv_token.pvBuffer);
223 s_pSecFn->FreeCredentialsHandle(&cred_handle);
224 s_pSecFn->DeleteSecurityContext(&sspi_context);
225 return CURLE_COULDNT_CONNECT;
226 }
227
228 }
229
230 if(sspi_send_token.pvBuffer) {
231 s_pSecFn->FreeContextBuffer(sspi_send_token.pvBuffer);
232 sspi_send_token.pvBuffer = NULL;
233 }
234 sspi_send_token.cbBuffer = 0;
235
236 if(sspi_recv_token.pvBuffer) {
237 s_pSecFn->FreeContextBuffer(sspi_recv_token.pvBuffer);
238 sspi_recv_token.pvBuffer = NULL;
239 }
240 sspi_recv_token.cbBuffer = 0;
241
242 if(status != SEC_I_CONTINUE_NEEDED)
243 break;
244
245 /* analyse response */
246
247 /* GSS-API response looks like
248 * +----+------+-----+----------------+
249 * |VER | MTYP | LEN | TOKEN |
250 * +----+------+----------------------+
251 * | 1 | 1 | 2 | up to 2^16 - 1 |
252 * +----+------+-----+----------------+
253 */
254
255 result = Curl_blockread_all(conn, sock, (char *)socksreq, 4, &actualread);
256 if(result || (actualread != 4)) {
257 failf(data, "Failed to receive SSPI authentication response.");
258 free(service_name);
259 s_pSecFn->FreeCredentialsHandle(&cred_handle);
260 s_pSecFn->DeleteSecurityContext(&sspi_context);
261 return CURLE_COULDNT_CONNECT;
262 }
263
264 /* ignore the first (VER) byte */
265 if(socksreq[1] == 255) { /* status / message type */
266 failf(data, "User was rejected by the SOCKS5 server (%u %u).",
267 (unsigned int)socksreq[0], (unsigned int)socksreq[1]);
268 free(service_name);
269 s_pSecFn->FreeCredentialsHandle(&cred_handle);
270 s_pSecFn->DeleteSecurityContext(&sspi_context);
271 return CURLE_COULDNT_CONNECT;
272 }
273
274 if(socksreq[1] != 1) { /* status / messgae type */
275 failf(data, "Invalid SSPI authentication response type (%u %u).",
276 (unsigned int)socksreq[0], (unsigned int)socksreq[1]);
277 free(service_name);
278 s_pSecFn->FreeCredentialsHandle(&cred_handle);
279 s_pSecFn->DeleteSecurityContext(&sspi_context);
280 return CURLE_COULDNT_CONNECT;
281 }
282
283 memcpy(&us_length, socksreq+2, sizeof(short));
284 us_length = ntohs(us_length);
285
286 sspi_recv_token.cbBuffer = us_length;
287 sspi_recv_token.pvBuffer = malloc(us_length);
288
289 if(!sspi_recv_token.pvBuffer) {
290 free(service_name);
291 s_pSecFn->FreeCredentialsHandle(&cred_handle);
292 s_pSecFn->DeleteSecurityContext(&sspi_context);
293 return CURLE_OUT_OF_MEMORY;
294 }
295 result = Curl_blockread_all(conn, sock, (char *)sspi_recv_token.pvBuffer,
296 sspi_recv_token.cbBuffer, &actualread);
297
298 if(result || (actualread != us_length)) {
299 failf(data, "Failed to receive SSPI authentication token.");
300 free(service_name);
301 if(sspi_recv_token.pvBuffer)
302 s_pSecFn->FreeContextBuffer(sspi_recv_token.pvBuffer);
303 s_pSecFn->FreeCredentialsHandle(&cred_handle);
304 s_pSecFn->DeleteSecurityContext(&sspi_context);
305 return CURLE_COULDNT_CONNECT;
306 }
307
308 context_handle = &sspi_context;
309 }
310
311 free(service_name);
312
313 /* Everything is good so far, user was authenticated! */
314 status = s_pSecFn->QueryCredentialsAttributes(&cred_handle,
315 SECPKG_CRED_ATTR_NAMES,
316 &names);
317 s_pSecFn->FreeCredentialsHandle(&cred_handle);
318 if(check_sspi_err(conn, status, "QueryCredentialAttributes")) {
319 s_pSecFn->DeleteSecurityContext(&sspi_context);
320 s_pSecFn->FreeContextBuffer(names.sUserName);
321 failf(data, "Failed to determine user name.");
322 return CURLE_COULDNT_CONNECT;
323 }
324 infof(data, "SOCKS5 server authencticated user %s with GSS-API.\n",
325 names.sUserName);
326 s_pSecFn->FreeContextBuffer(names.sUserName);
327
328 /* Do encryption */
329 socksreq[0] = 1; /* GSS-API subnegotiation version */
330 socksreq[1] = 2; /* encryption message type */
331
332 gss_enc = 0; /* no data protection */
333 /* do confidentiality protection if supported */
334 if(sspi_ret_flags & ISC_REQ_CONFIDENTIALITY)
335 gss_enc = 2;
336 /* else do integrity protection */
337 else if(sspi_ret_flags & ISC_REQ_INTEGRITY)
338 gss_enc = 1;
339
340 infof(data, "SOCKS5 server supports GSS-API %s data protection.\n",
341 (gss_enc==0)?"no":((gss_enc==1)?"integrity":"confidentiality") );
342 /* force to no data protection, avoid encryption/decryption for now */
343 gss_enc = 0;
344 /*
345 * Sending the encryption type in clear seems wrong. It should be
346 * protected with gss_seal()/gss_wrap(). See RFC1961 extract below
347 * The NEC reference implementations on which this is based is
348 * therefore at fault
349 *
350 * +------+------+------+.......................+
351 * + ver | mtyp | len | token |
352 * +------+------+------+.......................+
353 * + 0x01 | 0x02 | 0x02 | up to 2^16 - 1 octets |
354 * +------+------+------+.......................+
355 *
356 * Where:
357 *
358 * - "ver" is the protocol version number, here 1 to represent the
359 * first version of the SOCKS/GSS-API protocol
360 *
361 * - "mtyp" is the message type, here 2 to represent a protection
362 * -level negotiation message
363 *
364 * - "len" is the length of the "token" field in octets
365 *
366 * - "token" is the GSS-API encapsulated protection level
367 *
368 * The token is produced by encapsulating an octet containing the
369 * required protection level using gss_seal()/gss_wrap() with conf_req
370 * set to FALSE. The token is verified using gss_unseal()/
371 * gss_unwrap().
372 *
373 */
374
375 if(data->set.socks5_gssapi_nec) {
376 us_length = htons((short)1);
377 memcpy(socksreq+2, &us_length, sizeof(short));
378 }
379 else {
380 status = s_pSecFn->QueryContextAttributes(&sspi_context,
381 SECPKG_ATTR_SIZES,
382 &sspi_sizes);
383 if(check_sspi_err(conn, status, "QueryContextAttributes")) {
384 s_pSecFn->DeleteSecurityContext(&sspi_context);
385 failf(data, "Failed to query security context attributes.");
386 return CURLE_COULDNT_CONNECT;
387 }
388
389 sspi_w_token[0].cbBuffer = sspi_sizes.cbSecurityTrailer;
390 sspi_w_token[0].BufferType = SECBUFFER_TOKEN;
391 sspi_w_token[0].pvBuffer = malloc(sspi_sizes.cbSecurityTrailer);
392
393 if(!sspi_w_token[0].pvBuffer) {
394 s_pSecFn->DeleteSecurityContext(&sspi_context);
395 return CURLE_OUT_OF_MEMORY;
396 }
397
398 sspi_w_token[1].cbBuffer = 1;
399 sspi_w_token[1].pvBuffer = malloc(1);
400 if(!sspi_w_token[1].pvBuffer) {
401 s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer);
402 s_pSecFn->DeleteSecurityContext(&sspi_context);
403 return CURLE_OUT_OF_MEMORY;
404 }
405
406 memcpy(sspi_w_token[1].pvBuffer, &gss_enc, 1);
407 sspi_w_token[2].BufferType = SECBUFFER_PADDING;
408 sspi_w_token[2].cbBuffer = sspi_sizes.cbBlockSize;
409 sspi_w_token[2].pvBuffer = malloc(sspi_sizes.cbBlockSize);
410 if(!sspi_w_token[2].pvBuffer) {
411 s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer);
412 s_pSecFn->FreeContextBuffer(sspi_w_token[1].pvBuffer);
413 s_pSecFn->DeleteSecurityContext(&sspi_context);
414 return CURLE_OUT_OF_MEMORY;
415 }
416 status = s_pSecFn->EncryptMessage(&sspi_context,
417 KERB_WRAP_NO_ENCRYPT,
418 &wrap_desc,
419 0);
420 if(check_sspi_err(conn, status, "EncryptMessage")) {
421 s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer);
422 s_pSecFn->FreeContextBuffer(sspi_w_token[1].pvBuffer);
423 s_pSecFn->FreeContextBuffer(sspi_w_token[2].pvBuffer);
424 s_pSecFn->DeleteSecurityContext(&sspi_context);
425 failf(data, "Failed to query security context attributes.");
426 return CURLE_COULDNT_CONNECT;
427 }
428 sspi_send_token.cbBuffer = sspi_w_token[0].cbBuffer
429 + sspi_w_token[1].cbBuffer
430 + sspi_w_token[2].cbBuffer;
431 sspi_send_token.pvBuffer = malloc(sspi_send_token.cbBuffer);
432 if(!sspi_send_token.pvBuffer) {
433 s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer);
434 s_pSecFn->FreeContextBuffer(sspi_w_token[1].pvBuffer);
435 s_pSecFn->FreeContextBuffer(sspi_w_token[2].pvBuffer);
436 s_pSecFn->DeleteSecurityContext(&sspi_context);
437 return CURLE_OUT_OF_MEMORY;
438 }
439
440 memcpy(sspi_send_token.pvBuffer, sspi_w_token[0].pvBuffer,
441 sspi_w_token[0].cbBuffer);
442 memcpy((PUCHAR) sspi_send_token.pvBuffer +(int)sspi_w_token[0].cbBuffer,
443 sspi_w_token[1].pvBuffer, sspi_w_token[1].cbBuffer);
444 memcpy((PUCHAR) sspi_send_token.pvBuffer
445 +sspi_w_token[0].cbBuffer
446 +sspi_w_token[1].cbBuffer,
447 sspi_w_token[2].pvBuffer, sspi_w_token[2].cbBuffer);
448
449 s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer);
450 sspi_w_token[0].pvBuffer = NULL;
451 sspi_w_token[0].cbBuffer = 0;
452 s_pSecFn->FreeContextBuffer(sspi_w_token[1].pvBuffer);
453 sspi_w_token[1].pvBuffer = NULL;
454 sspi_w_token[1].cbBuffer = 0;
455 s_pSecFn->FreeContextBuffer(sspi_w_token[2].pvBuffer);
456 sspi_w_token[2].pvBuffer = NULL;
457 sspi_w_token[2].cbBuffer = 0;
458
459 us_length = htons((short)sspi_send_token.cbBuffer);
460 memcpy(socksreq+2, &us_length, sizeof(short));
461 }
462
463 code = Curl_write_plain(conn, sock, (char *)socksreq, 4, &written);
464 if(code || (4 != written)) {
465 failf(data, "Failed to send SSPI encryption request.");
466 if(sspi_send_token.pvBuffer)
467 s_pSecFn->FreeContextBuffer(sspi_send_token.pvBuffer);
468 s_pSecFn->DeleteSecurityContext(&sspi_context);
469 return CURLE_COULDNT_CONNECT;
470 }
471
472 if(data->set.socks5_gssapi_nec) {
473 memcpy(socksreq, &gss_enc, 1);
474 code = Curl_write_plain(conn, sock, (char *)socksreq, 1, &written);
475 if(code || (1 != written)) {
476 failf(data, "Failed to send SSPI encryption type.");
477 s_pSecFn->DeleteSecurityContext(&sspi_context);
478 return CURLE_COULDNT_CONNECT;
479 }
480 }
481 else {
482 code = Curl_write_plain(conn, sock, (char *)sspi_send_token.pvBuffer,
483 sspi_send_token.cbBuffer, &written);
484 if(code || (sspi_send_token.cbBuffer != (size_t)written)) {
485 failf(data, "Failed to send SSPI encryption type.");
486 if(sspi_send_token.pvBuffer)
487 s_pSecFn->FreeContextBuffer(sspi_send_token.pvBuffer);
488 s_pSecFn->DeleteSecurityContext(&sspi_context);
489 return CURLE_COULDNT_CONNECT;
490 }
491 if(sspi_send_token.pvBuffer)
492 s_pSecFn->FreeContextBuffer(sspi_send_token.pvBuffer);
493 }
494
495 result = Curl_blockread_all(conn, sock, (char *)socksreq, 4, &actualread);
496 if(result || (actualread != 4)) {
497 failf(data, "Failed to receive SSPI encryption response.");
498 s_pSecFn->DeleteSecurityContext(&sspi_context);
499 return CURLE_COULDNT_CONNECT;
500 }
501
502 /* ignore the first (VER) byte */
503 if(socksreq[1] == 255) { /* status / message type */
504 failf(data, "User was rejected by the SOCKS5 server (%u %u).",
505 (unsigned int)socksreq[0], (unsigned int)socksreq[1]);
506 s_pSecFn->DeleteSecurityContext(&sspi_context);
507 return CURLE_COULDNT_CONNECT;
508 }
509
510 if(socksreq[1] != 2) { /* status / message type */
511 failf(data, "Invalid SSPI encryption response type (%u %u).",
512 (unsigned int)socksreq[0], (unsigned int)socksreq[1]);
513 s_pSecFn->DeleteSecurityContext(&sspi_context);
514 return CURLE_COULDNT_CONNECT;
515 }
516
517 memcpy(&us_length, socksreq+2, sizeof(short));
518 us_length = ntohs(us_length);
519
520 sspi_w_token[0].cbBuffer = us_length;
521 sspi_w_token[0].pvBuffer = malloc(us_length);
522 if(!sspi_w_token[0].pvBuffer) {
523 s_pSecFn->DeleteSecurityContext(&sspi_context);
524 return CURLE_OUT_OF_MEMORY;
525 }
526
527 result = Curl_blockread_all(conn, sock, (char *)sspi_w_token[0].pvBuffer,
528 sspi_w_token[0].cbBuffer, &actualread);
529
530 if(result || (actualread != us_length)) {
531 failf(data, "Failed to receive SSPI encryption type.");
532 s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer);
533 s_pSecFn->DeleteSecurityContext(&sspi_context);
534 return CURLE_COULDNT_CONNECT;
535 }
536
537
538 if(!data->set.socks5_gssapi_nec) {
539 wrap_desc.cBuffers = 2;
540 sspi_w_token[0].BufferType = SECBUFFER_STREAM;
541 sspi_w_token[1].BufferType = SECBUFFER_DATA;
542 sspi_w_token[1].cbBuffer = 0;
543 sspi_w_token[1].pvBuffer = NULL;
544
545 status = s_pSecFn->DecryptMessage(&sspi_context,
546 &wrap_desc,
547 0,
548 &qop);
549
550 if(check_sspi_err(conn, status, "DecryptMessage")) {
551 if(sspi_w_token[0].pvBuffer)
552 s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer);
553 if(sspi_w_token[1].pvBuffer)
554 s_pSecFn->FreeContextBuffer(sspi_w_token[1].pvBuffer);
555 s_pSecFn->DeleteSecurityContext(&sspi_context);
556 failf(data, "Failed to query security context attributes.");
557 return CURLE_COULDNT_CONNECT;
558 }
559
560 if(sspi_w_token[1].cbBuffer != 1) {
561 failf(data, "Invalid SSPI encryption response length (%lu).",
562 (unsigned long)sspi_w_token[1].cbBuffer);
563 if(sspi_w_token[0].pvBuffer)
564 s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer);
565 if(sspi_w_token[1].pvBuffer)
566 s_pSecFn->FreeContextBuffer(sspi_w_token[1].pvBuffer);
567 s_pSecFn->DeleteSecurityContext(&sspi_context);
568 return CURLE_COULDNT_CONNECT;
569 }
570
571 memcpy(socksreq, sspi_w_token[1].pvBuffer, sspi_w_token[1].cbBuffer);
572 s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer);
573 s_pSecFn->FreeContextBuffer(sspi_w_token[1].pvBuffer);
574 }
575 else {
576 if(sspi_w_token[0].cbBuffer != 1) {
577 failf(data, "Invalid SSPI encryption response length (%lu).",
578 (unsigned long)sspi_w_token[0].cbBuffer);
579 s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer);
580 s_pSecFn->DeleteSecurityContext(&sspi_context);
581 return CURLE_COULDNT_CONNECT;
582 }
583 memcpy(socksreq, sspi_w_token[0].pvBuffer, sspi_w_token[0].cbBuffer);
584 s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer);
585 }
586
587 infof(data, "SOCKS5 access with%s protection granted.\n",
588 (socksreq[0]==0)?"out GSS-API data":
589 ((socksreq[0]==1)?" GSS-API integrity":" GSS-API confidentiality"));
590
591 /* For later use if encryption is required
592 conn->socks5_gssapi_enctype = socksreq[0];
593 if(socksreq[0] != 0)
594 conn->socks5_sspi_context = sspi_context;
595 else {
596 s_pSecFn->DeleteSecurityContext(&sspi_context);
597 conn->socks5_sspi_context = sspi_context;
598 }
599 */
600 return CURLE_OK;
601 }
602 #endif
603