source: UsbWattMeter/trunk/curl-7.47.1/lib/socks_gssapi.c@ 167

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[164]1/***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 2009, 2011, Markus Moeller, <markus_moeller@compuserve.com>
9 * Copyright (C) 2012 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
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(HAVE_GSSAPI) && !defined(CURL_DISABLE_PROXY)
27
28#include "curl_gssapi.h"
29#include "urldata.h"
30#include "sendf.h"
31#include "connect.h"
32#include "timeval.h"
33#include "socks.h"
34#include "warnless.h"
35#include "curl_printf.h"
36#include "curl_memory.h"
37/* The last #include file should be: */
38#include "memdebug.h"
39
40static gss_ctx_id_t gss_context = GSS_C_NO_CONTEXT;
41
42/*
43 * Helper GSS-API error functions.
44 */
45static int check_gss_err(struct SessionHandle *data,
46 OM_uint32 major_status,
47 OM_uint32 minor_status,
48 const char* function)
49{
50 if(GSS_ERROR(major_status)) {
51 OM_uint32 maj_stat, min_stat;
52 OM_uint32 msg_ctx = 0;
53 gss_buffer_desc status_string;
54 char buf[1024];
55 size_t len;
56
57 len = 0;
58 msg_ctx = 0;
59 while(!msg_ctx) {
60 /* convert major status code (GSS-API error) to text */
61 maj_stat = gss_display_status(&min_stat, major_status,
62 GSS_C_GSS_CODE,
63 GSS_C_NULL_OID,
64 &msg_ctx, &status_string);
65 if(maj_stat == GSS_S_COMPLETE) {
66 if(sizeof(buf) > len + status_string.length + 1) {
67 strcpy(buf+len, (char*) status_string.value);
68 len += status_string.length;
69 }
70 gss_release_buffer(&min_stat, &status_string);
71 break;
72 }
73 gss_release_buffer(&min_stat, &status_string);
74 }
75 if(sizeof(buf) > len + 3) {
76 strcpy(buf+len, ".\n");
77 len += 2;
78 }
79 msg_ctx = 0;
80 while(!msg_ctx) {
81 /* convert minor status code (underlying routine error) to text */
82 maj_stat = gss_display_status(&min_stat, minor_status,
83 GSS_C_MECH_CODE,
84 GSS_C_NULL_OID,
85 &msg_ctx, &status_string);
86 if(maj_stat == GSS_S_COMPLETE) {
87 if(sizeof(buf) > len + status_string.length)
88 strcpy(buf+len, (char*) status_string.value);
89 gss_release_buffer(&min_stat, &status_string);
90 break;
91 }
92 gss_release_buffer(&min_stat, &status_string);
93 }
94 failf(data, "GSS-API error: %s failed:\n%s", function, buf);
95 return 1;
96 }
97
98 return 0;
99}
100
101CURLcode Curl_SOCKS5_gssapi_negotiate(int sockindex,
102 struct connectdata *conn)
103{
104 struct SessionHandle *data = conn->data;
105 curl_socket_t sock = conn->sock[sockindex];
106 CURLcode code;
107 ssize_t actualread;
108 ssize_t written;
109 int result;
110 OM_uint32 gss_major_status, gss_minor_status, gss_status;
111 OM_uint32 gss_ret_flags;
112 int gss_conf_state, gss_enc;
113 gss_buffer_desc service = GSS_C_EMPTY_BUFFER;
114 gss_buffer_desc gss_send_token = GSS_C_EMPTY_BUFFER;
115 gss_buffer_desc gss_recv_token = GSS_C_EMPTY_BUFFER;
116 gss_buffer_desc gss_w_token = GSS_C_EMPTY_BUFFER;
117 gss_buffer_desc* gss_token = GSS_C_NO_BUFFER;
118 gss_name_t server = GSS_C_NO_NAME;
119 gss_name_t gss_client_name = GSS_C_NO_NAME;
120 unsigned short us_length;
121 char *user=NULL;
122 unsigned char socksreq[4]; /* room for GSS-API exchange header only */
123 char *serviceptr = data->set.str[STRING_SOCKS5_GSSAPI_SERVICE];
124
125 /* GSS-API request looks like
126 * +----+------+-----+----------------+
127 * |VER | MTYP | LEN | TOKEN |
128 * +----+------+----------------------+
129 * | 1 | 1 | 2 | up to 2^16 - 1 |
130 * +----+------+-----+----------------+
131 */
132
133 /* prepare service name */
134 if(strchr(serviceptr, '/')) {
135 service.value = malloc(strlen(serviceptr));
136 if(!service.value)
137 return CURLE_OUT_OF_MEMORY;
138 service.length = strlen(serviceptr);
139 memcpy(service.value, serviceptr, service.length);
140
141 gss_major_status = gss_import_name(&gss_minor_status, &service,
142 (gss_OID) GSS_C_NULL_OID, &server);
143 }
144 else {
145 service.value = malloc(strlen(serviceptr) +strlen(conn->proxy.name)+2);
146 if(!service.value)
147 return CURLE_OUT_OF_MEMORY;
148 service.length = strlen(serviceptr) +strlen(conn->proxy.name)+1;
149 snprintf(service.value, service.length+1, "%s@%s",
150 serviceptr, conn->proxy.name);
151
152 gss_major_status = gss_import_name(&gss_minor_status, &service,
153 GSS_C_NT_HOSTBASED_SERVICE, &server);
154 }
155
156 gss_release_buffer(&gss_status, &service); /* clear allocated memory */
157
158 if(check_gss_err(data, gss_major_status,
159 gss_minor_status, "gss_import_name()")) {
160 failf(data, "Failed to create service name.");
161 gss_release_name(&gss_status, &server);
162 return CURLE_COULDNT_CONNECT;
163 }
164
165 /* As long as we need to keep sending some context info, and there's no */
166 /* errors, keep sending it... */
167 for(;;) {
168 gss_major_status = Curl_gss_init_sec_context(data,
169 &gss_minor_status,
170 &gss_context,
171 server,
172 &Curl_krb5_mech_oid,
173 NULL,
174 gss_token,
175 &gss_send_token,
176 TRUE,
177 &gss_ret_flags);
178
179 if(gss_token != GSS_C_NO_BUFFER)
180 gss_release_buffer(&gss_status, &gss_recv_token);
181 if(check_gss_err(data, gss_major_status,
182 gss_minor_status, "gss_init_sec_context")) {
183 gss_release_name(&gss_status, &server);
184 gss_release_buffer(&gss_status, &gss_recv_token);
185 gss_release_buffer(&gss_status, &gss_send_token);
186 gss_delete_sec_context(&gss_status, &gss_context, NULL);
187 failf(data, "Failed to initial GSS-API token.");
188 return CURLE_COULDNT_CONNECT;
189 }
190
191 if(gss_send_token.length != 0) {
192 socksreq[0] = 1; /* GSS-API subnegotiation version */
193 socksreq[1] = 1; /* authentication message type */
194 us_length = htons((short)gss_send_token.length);
195 memcpy(socksreq+2, &us_length, sizeof(short));
196
197 code = Curl_write_plain(conn, sock, (char *)socksreq, 4, &written);
198 if(code || (4 != written)) {
199 failf(data, "Failed to send GSS-API authentication request.");
200 gss_release_name(&gss_status, &server);
201 gss_release_buffer(&gss_status, &gss_recv_token);
202 gss_release_buffer(&gss_status, &gss_send_token);
203 gss_delete_sec_context(&gss_status, &gss_context, NULL);
204 return CURLE_COULDNT_CONNECT;
205 }
206
207 code = Curl_write_plain(conn, sock, (char *)gss_send_token.value,
208 gss_send_token.length, &written);
209
210 if(code || ((ssize_t)gss_send_token.length != written)) {
211 failf(data, "Failed to send GSS-API authentication token.");
212 gss_release_name(&gss_status, &server);
213 gss_release_buffer(&gss_status, &gss_recv_token);
214 gss_release_buffer(&gss_status, &gss_send_token);
215 gss_delete_sec_context(&gss_status, &gss_context, NULL);
216 return CURLE_COULDNT_CONNECT;
217 }
218
219 }
220
221 gss_release_buffer(&gss_status, &gss_send_token);
222 gss_release_buffer(&gss_status, &gss_recv_token);
223 if(gss_major_status != GSS_S_CONTINUE_NEEDED) break;
224
225 /* analyse response */
226
227 /* GSS-API response looks like
228 * +----+------+-----+----------------+
229 * |VER | MTYP | LEN | TOKEN |
230 * +----+------+----------------------+
231 * | 1 | 1 | 2 | up to 2^16 - 1 |
232 * +----+------+-----+----------------+
233 */
234
235 result=Curl_blockread_all(conn, sock, (char *)socksreq, 4, &actualread);
236 if(result || (actualread != 4)) {
237 failf(data, "Failed to receive GSS-API authentication response.");
238 gss_release_name(&gss_status, &server);
239 gss_delete_sec_context(&gss_status, &gss_context, NULL);
240 return CURLE_COULDNT_CONNECT;
241 }
242
243 /* ignore the first (VER) byte */
244 if(socksreq[1] == 255) { /* status / message type */
245 failf(data, "User was rejected by the SOCKS5 server (%d %d).",
246 socksreq[0], socksreq[1]);
247 gss_release_name(&gss_status, &server);
248 gss_delete_sec_context(&gss_status, &gss_context, NULL);
249 return CURLE_COULDNT_CONNECT;
250 }
251
252 if(socksreq[1] != 1) { /* status / messgae type */
253 failf(data, "Invalid GSS-API authentication response type (%d %d).",
254 socksreq[0], socksreq[1]);
255 gss_release_name(&gss_status, &server);
256 gss_delete_sec_context(&gss_status, &gss_context, NULL);
257 return CURLE_COULDNT_CONNECT;
258 }
259
260 memcpy(&us_length, socksreq+2, sizeof(short));
261 us_length = ntohs(us_length);
262
263 gss_recv_token.length=us_length;
264 gss_recv_token.value=malloc(us_length);
265 if(!gss_recv_token.value) {
266 failf(data,
267 "Could not allocate memory for GSS-API authentication "
268 "response token.");
269 gss_release_name(&gss_status, &server);
270 gss_delete_sec_context(&gss_status, &gss_context, NULL);
271 return CURLE_OUT_OF_MEMORY;
272 }
273
274 result=Curl_blockread_all(conn, sock, (char *)gss_recv_token.value,
275 gss_recv_token.length, &actualread);
276
277 if(result || (actualread != us_length)) {
278 failf(data, "Failed to receive GSS-API authentication token.");
279 gss_release_name(&gss_status, &server);
280 gss_release_buffer(&gss_status, &gss_recv_token);
281 gss_delete_sec_context(&gss_status, &gss_context, NULL);
282 return CURLE_COULDNT_CONNECT;
283 }
284
285 gss_token = &gss_recv_token;
286 }
287
288 gss_release_name(&gss_status, &server);
289
290 /* Everything is good so far, user was authenticated! */
291 gss_major_status = gss_inquire_context (&gss_minor_status, gss_context,
292 &gss_client_name, NULL, NULL, NULL,
293 NULL, NULL, NULL);
294 if(check_gss_err(data, gss_major_status,
295 gss_minor_status, "gss_inquire_context")) {
296 gss_delete_sec_context(&gss_status, &gss_context, NULL);
297 gss_release_name(&gss_status, &gss_client_name);
298 failf(data, "Failed to determine user name.");
299 return CURLE_COULDNT_CONNECT;
300 }
301 gss_major_status = gss_display_name(&gss_minor_status, gss_client_name,
302 &gss_send_token, NULL);
303 if(check_gss_err(data, gss_major_status,
304 gss_minor_status, "gss_display_name")) {
305 gss_delete_sec_context(&gss_status, &gss_context, NULL);
306 gss_release_name(&gss_status, &gss_client_name);
307 gss_release_buffer(&gss_status, &gss_send_token);
308 failf(data, "Failed to determine user name.");
309 return CURLE_COULDNT_CONNECT;
310 }
311 user=malloc(gss_send_token.length+1);
312 if(!user) {
313 gss_delete_sec_context(&gss_status, &gss_context, NULL);
314 gss_release_name(&gss_status, &gss_client_name);
315 gss_release_buffer(&gss_status, &gss_send_token);
316 return CURLE_OUT_OF_MEMORY;
317 }
318
319 memcpy(user, gss_send_token.value, gss_send_token.length);
320 user[gss_send_token.length] = '\0';
321 gss_release_name(&gss_status, &gss_client_name);
322 gss_release_buffer(&gss_status, &gss_send_token);
323 infof(data, "SOCKS5 server authencticated user %s with GSS-API.\n",user);
324 free(user);
325 user=NULL;
326
327 /* Do encryption */
328 socksreq[0] = 1; /* GSS-API subnegotiation version */
329 socksreq[1] = 2; /* encryption message type */
330
331 gss_enc = 0; /* no data protection */
332 /* do confidentiality protection if supported */
333 if(gss_ret_flags & GSS_C_CONF_FLAG)
334 gss_enc = 2;
335 /* else do integrity protection */
336 else if(gss_ret_flags & GSS_C_INTEG_FLAG)
337 gss_enc = 1;
338
339 infof(data, "SOCKS5 server supports GSS-API %s data protection.\n",
340 (gss_enc==0)?"no":((gss_enc==1)?"integrity":"confidentiality"));
341 /* force for the moment to no data protection */
342 gss_enc = 0;
343 /*
344 * Sending the encryption type in clear seems wrong. It should be
345 * protected with gss_seal()/gss_wrap(). See RFC1961 extract below
346 * The NEC reference implementations on which this is based is
347 * therefore at fault
348 *
349 * +------+------+------+.......................+
350 * + ver | mtyp | len | token |
351 * +------+------+------+.......................+
352 * + 0x01 | 0x02 | 0x02 | up to 2^16 - 1 octets |
353 * +------+------+------+.......................+
354 *
355 * Where:
356 *
357 * - "ver" is the protocol version number, here 1 to represent the
358 * first version of the SOCKS/GSS-API protocol
359 *
360 * - "mtyp" is the message type, here 2 to represent a protection
361 * -level negotiation message
362 *
363 * - "len" is the length of the "token" field in octets
364 *
365 * - "token" is the GSS-API encapsulated protection level
366 *
367 * The token is produced by encapsulating an octet containing the
368 * required protection level using gss_seal()/gss_wrap() with conf_req
369 * set to FALSE. The token is verified using gss_unseal()/
370 * gss_unwrap().
371 *
372 */
373 if(data->set.socks5_gssapi_nec) {
374 us_length = htons((short)1);
375 memcpy(socksreq+2, &us_length, sizeof(short));
376 }
377 else {
378 gss_send_token.length = 1;
379 gss_send_token.value = malloc(1);
380 if(!gss_send_token.value) {
381 gss_delete_sec_context(&gss_status, &gss_context, NULL);
382 return CURLE_OUT_OF_MEMORY;
383 }
384 memcpy(gss_send_token.value, &gss_enc, 1);
385
386 gss_major_status = gss_wrap(&gss_minor_status, gss_context, 0,
387 GSS_C_QOP_DEFAULT, &gss_send_token,
388 &gss_conf_state, &gss_w_token);
389
390 if(check_gss_err(data, gss_major_status, gss_minor_status, "gss_wrap")) {
391 gss_release_buffer(&gss_status, &gss_send_token);
392 gss_release_buffer(&gss_status, &gss_w_token);
393 gss_delete_sec_context(&gss_status, &gss_context, NULL);
394 failf(data, "Failed to wrap GSS-API encryption value into token.");
395 return CURLE_COULDNT_CONNECT;
396 }
397 gss_release_buffer(&gss_status, &gss_send_token);
398
399 us_length = htons((short)gss_w_token.length);
400 memcpy(socksreq+2, &us_length, sizeof(short));
401 }
402
403 code = Curl_write_plain(conn, sock, (char *)socksreq, 4, &written);
404 if(code || (4 != written)) {
405 failf(data, "Failed to send GSS-API encryption request.");
406 gss_release_buffer(&gss_status, &gss_w_token);
407 gss_delete_sec_context(&gss_status, &gss_context, NULL);
408 return CURLE_COULDNT_CONNECT;
409 }
410
411 if(data->set.socks5_gssapi_nec) {
412 memcpy(socksreq, &gss_enc, 1);
413 code = Curl_write_plain(conn, sock, socksreq, 1, &written);
414 if(code || ( 1 != written)) {
415 failf(data, "Failed to send GSS-API encryption type.");
416 gss_delete_sec_context(&gss_status, &gss_context, NULL);
417 return CURLE_COULDNT_CONNECT;
418 }
419 }
420 else {
421 code = Curl_write_plain(conn, sock, (char *)gss_w_token.value,
422 gss_w_token.length, &written);
423 if(code || ((ssize_t)gss_w_token.length != written)) {
424 failf(data, "Failed to send GSS-API encryption type.");
425 gss_release_buffer(&gss_status, &gss_w_token);
426 gss_delete_sec_context(&gss_status, &gss_context, NULL);
427 return CURLE_COULDNT_CONNECT;
428 }
429 gss_release_buffer(&gss_status, &gss_w_token);
430 }
431
432 result=Curl_blockread_all(conn, sock, (char *)socksreq, 4, &actualread);
433 if(result || (actualread != 4)) {
434 failf(data, "Failed to receive GSS-API encryption response.");
435 gss_delete_sec_context(&gss_status, &gss_context, NULL);
436 return CURLE_COULDNT_CONNECT;
437 }
438
439 /* ignore the first (VER) byte */
440 if(socksreq[1] == 255) { /* status / message type */
441 failf(data, "User was rejected by the SOCKS5 server (%d %d).",
442 socksreq[0], socksreq[1]);
443 gss_delete_sec_context(&gss_status, &gss_context, NULL);
444 return CURLE_COULDNT_CONNECT;
445 }
446
447 if(socksreq[1] != 2) { /* status / messgae type */
448 failf(data, "Invalid GSS-API encryption response type (%d %d).",
449 socksreq[0], socksreq[1]);
450 gss_delete_sec_context(&gss_status, &gss_context, NULL);
451 return CURLE_COULDNT_CONNECT;
452 }
453
454 memcpy(&us_length, socksreq+2, sizeof(short));
455 us_length = ntohs(us_length);
456
457 gss_recv_token.length= us_length;
458 gss_recv_token.value=malloc(gss_recv_token.length);
459 if(!gss_recv_token.value) {
460 gss_delete_sec_context(&gss_status, &gss_context, NULL);
461 return CURLE_OUT_OF_MEMORY;
462 }
463 result=Curl_blockread_all(conn, sock, (char *)gss_recv_token.value,
464 gss_recv_token.length, &actualread);
465
466 if(result || (actualread != us_length)) {
467 failf(data, "Failed to receive GSS-API encryptrion type.");
468 gss_release_buffer(&gss_status, &gss_recv_token);
469 gss_delete_sec_context(&gss_status, &gss_context, NULL);
470 return CURLE_COULDNT_CONNECT;
471 }
472
473 if(!data->set.socks5_gssapi_nec) {
474 gss_major_status = gss_unwrap(&gss_minor_status, gss_context,
475 &gss_recv_token, &gss_w_token,
476 0, GSS_C_QOP_DEFAULT);
477
478 if(check_gss_err(data, gss_major_status, gss_minor_status, "gss_unwrap")) {
479 gss_release_buffer(&gss_status, &gss_recv_token);
480 gss_release_buffer(&gss_status, &gss_w_token);
481 gss_delete_sec_context(&gss_status, &gss_context, NULL);
482 failf(data, "Failed to unwrap GSS-API encryption value into token.");
483 return CURLE_COULDNT_CONNECT;
484 }
485 gss_release_buffer(&gss_status, &gss_recv_token);
486
487 if(gss_w_token.length != 1) {
488 failf(data, "Invalid GSS-API encryption response length (%d).",
489 gss_w_token.length);
490 gss_release_buffer(&gss_status, &gss_w_token);
491 gss_delete_sec_context(&gss_status, &gss_context, NULL);
492 return CURLE_COULDNT_CONNECT;
493 }
494
495 memcpy(socksreq, gss_w_token.value, gss_w_token.length);
496 gss_release_buffer(&gss_status, &gss_w_token);
497 }
498 else {
499 if(gss_recv_token.length != 1) {
500 failf(data, "Invalid GSS-API encryption response length (%d).",
501 gss_recv_token.length);
502 gss_release_buffer(&gss_status, &gss_recv_token);
503 gss_delete_sec_context(&gss_status, &gss_context, NULL);
504 return CURLE_COULDNT_CONNECT;
505 }
506
507 memcpy(socksreq, gss_recv_token.value, gss_recv_token.length);
508 gss_release_buffer(&gss_status, &gss_recv_token);
509 }
510
511 infof(data, "SOCKS5 access with%s protection granted.\n",
512 (socksreq[0]==0)?"out GSS-API data":
513 ((socksreq[0]==1)?" GSS-API integrity":" GSS-API confidentiality"));
514
515 conn->socks5_gssapi_enctype = socksreq[0];
516 if(socksreq[0] == 0)
517 gss_delete_sec_context(&gss_status, &gss_context, NULL);
518
519 return CURLE_OK;
520}
521
522#endif /* HAVE_GSSAPI && !CURL_DISABLE_PROXY */
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