socks_gssapi.c@ 108333

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curl-8.11.1: Applied and adjusted our curl changes to 8.7.1. jiraref:VBP-1535
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1	/***************************************************************************
2	* _ _ ____ _
3	* Project ___\| \| \| \| _ \\| \|
4	* / __\| \| \| \| \|_) \| \|
5	* \| (__\| \|_\| \| _ <\| \|___
6	* \___\|\___/\|_\| \_\_____\|
7	*
8	* Copyright (C) Daniel Stenberg, <[email protected]>, et al.
9	* Copyright (C) Markus Moeller, <[email protected]>
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.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	* SPDX-License-Identifier: curl
23	*
24	***************************************************************************/
25
26	#include "curl_setup.h"
27
28	#if defined(HAVE_GSSAPI) && !defined(CURL_DISABLE_PROXY)
29
30	#include "curl_gssapi.h"
31	#include "urldata.h"
32	#include "sendf.h"
33	#include "cfilters.h"
34	#include "connect.h"
35	#include "timeval.h"
36	#include "socks.h"
37	#include "warnless.h"
38	#include "strdup.h"
39
40	/* The last 3 #include files should be in this order */
41	#include "curl_printf.h"
42	#include "curl_memory.h"
43	#include "memdebug.h"
44
45	#define MAX_GSS_LEN 1024
46
47	static gss_ctx_id_t gss_context = GSS_C_NO_CONTEXT;
48
49	/*
50	* Helper GSS-API error functions.
51	*/
52	static int check_gss_err(struct Curl_easy *data,
53	OM_uint32 major_status,
54	OM_uint32 minor_status,
55	const char *function)
56	{
57	if(GSS_ERROR(major_status)) {
58	OM_uint32 maj_stat, min_stat;
59	OM_uint32 msg_ctx = 0;
60	gss_buffer_desc status_string = GSS_C_EMPTY_BUFFER;
61	struct dynbuf dbuf;
62
63	Curl_dyn_init(&dbuf, MAX_GSS_LEN);
64	msg_ctx = 0;
65	while(!msg_ctx) {
66	/* convert major status code (GSS-API error) to text */
67	maj_stat = gss_display_status(&min_stat, major_status,
68	GSS_C_GSS_CODE,
69	GSS_C_NULL_OID,
70	&msg_ctx, &status_string);
71	if(maj_stat == GSS_S_COMPLETE) {
72	if(Curl_dyn_addn(&dbuf, status_string.value,
73	status_string.length))
74	return 1; /* error */
75	gss_release_buffer(&min_stat, &status_string);
76	break;
77	}
78	gss_release_buffer(&min_stat, &status_string);
79	}
80	if(Curl_dyn_addn(&dbuf, ".\n", 2))
81	return 1; /* error */
82	msg_ctx = 0;
83	while(!msg_ctx) {
84	/* convert minor status code (underlying routine error) to text */
85	maj_stat = gss_display_status(&min_stat, minor_status,
86	GSS_C_MECH_CODE,
87	GSS_C_NULL_OID,
88	&msg_ctx, &status_string);
89	if(maj_stat == GSS_S_COMPLETE) {
90	if(Curl_dyn_addn(&dbuf, status_string.value,
91	status_string.length))
92	return 1; /* error */
93	gss_release_buffer(&min_stat, &status_string);
94	break;
95	}
96	gss_release_buffer(&min_stat, &status_string);
97	}
98	failf(data, "GSS-API error: %s failed: %s", function, Curl_dyn_ptr(&dbuf));
99	Curl_dyn_free(&dbuf);
100	return 1;
101	}
102
103	return 0;
104	}
105
106	CURLcode Curl_SOCKS5_gssapi_negotiate(struct Curl_cfilter *cf,
107	struct Curl_easy *data)
108	{
109	struct connectdata *conn = cf->conn;
110	curl_socket_t sock = conn->sock[cf->sockindex];
111	CURLcode code;
112	ssize_t actualread;
113	ssize_t nwritten;
114	int result;
115	OM_uint32 gss_major_status, gss_minor_status, gss_status;
116	OM_uint32 gss_ret_flags;
117	int gss_conf_state, gss_enc;
118	gss_buffer_desc service = GSS_C_EMPTY_BUFFER;
119	gss_buffer_desc gss_send_token = GSS_C_EMPTY_BUFFER;
120	gss_buffer_desc gss_recv_token = GSS_C_EMPTY_BUFFER;
121	gss_buffer_desc gss_w_token = GSS_C_EMPTY_BUFFER;
122	gss_buffer_desc *gss_token = GSS_C_NO_BUFFER;
123	gss_name_t server = GSS_C_NO_NAME;
124	gss_name_t gss_client_name = GSS_C_NO_NAME;
125	unsigned short us_length;
126	char *user = NULL;
127	unsigned char socksreq[4]; /* room for GSS-API exchange header only */
128	const char *serviceptr = data->set.str[STRING_PROXY_SERVICE_NAME] ?
129	data->set.str[STRING_PROXY_SERVICE_NAME] : "rcmd";
130	const size_t serviceptr_length = strlen(serviceptr);
131
132	/* GSS-API request looks like
133	* +----+------+-----+----------------+
134	* \|VER \| MTYP \| LEN \| TOKEN \|
135	* +----+------+----------------------+
136	* \| 1 \| 1 \| 2 \| up to 2^16 - 1 \|
137	* +----+------+-----+----------------+
138	*/
139
140	/* prepare service name */
141	if(strchr(serviceptr, '/')) {
142	service.length = serviceptr_length;
143	service.value = Curl_memdup(serviceptr, service.length);
144	if(!service.value)
145	return CURLE_OUT_OF_MEMORY;
146
147	gss_major_status = gss_import_name(&gss_minor_status, &service,
148	(gss_OID) GSS_C_NULL_OID, &server);
149	}
150	else {
151	service.value = malloc(serviceptr_length +
152	strlen(conn->socks_proxy.host.name) + 2);
153	if(!service.value)
154	return CURLE_OUT_OF_MEMORY;
155	service.length = serviceptr_length +
156	strlen(conn->socks_proxy.host.name) + 1;
157	msnprintf(service.value, service.length + 1, "%s@%s",
158	serviceptr, conn->socks_proxy.host.name);
159
160	gss_major_status = gss_import_name(&gss_minor_status, &service,
161	GSS_C_NT_HOSTBASED_SERVICE, &server);
162	}
163
164	gss_release_buffer(&gss_status, &service); /* clear allocated memory */
165
166	if(check_gss_err(data, gss_major_status,
167	gss_minor_status, "gss_import_name()")) {
168	failf(data, "Failed to create service name.");
169	gss_release_name(&gss_status, &server);
170	return CURLE_COULDNT_CONNECT;
171	}
172
173	(void)curlx_nonblock(sock, FALSE);
174
175	/* As long as we need to keep sending some context info, and there is no */
176	/* errors, keep sending it... */
177	for(;;) {
178	gss_major_status = Curl_gss_init_sec_context(data,
179	&gss_minor_status,
180	&gss_context,
181	server,
182	&Curl_krb5_mech_oid,
183	NULL,
184	gss_token,
185	&gss_send_token,
186	TRUE,
187	&gss_ret_flags);
188
189	if(gss_token != GSS_C_NO_BUFFER)
190	gss_release_buffer(&gss_status, &gss_recv_token);
191	if(check_gss_err(data, gss_major_status,
192	gss_minor_status, "gss_init_sec_context")) {
193	gss_release_name(&gss_status, &server);
194	gss_release_buffer(&gss_status, &gss_recv_token);
195	gss_release_buffer(&gss_status, &gss_send_token);
196	gss_delete_sec_context(&gss_status, &gss_context, NULL);
197	failf(data, "Failed to initial GSS-API token.");
198	return CURLE_COULDNT_CONNECT;
199	}
200
201	if(gss_send_token.length) {
202	socksreq[0] = 1; /* GSS-API subnegotiation version */
203	socksreq[1] = 1; /* authentication message type */
204	us_length = htons((unsigned short)gss_send_token.length);
205	memcpy(socksreq + 2, &us_length, sizeof(short));
206
207	nwritten = Curl_conn_cf_send(cf->next, data, (char *)socksreq, 4,
208	FALSE, &code);
209	if(code \|\| (4 != nwritten)) {
210	failf(data, "Failed to send GSS-API authentication request.");
211	gss_release_name(&gss_status, &server);
212	gss_release_buffer(&gss_status, &gss_recv_token);
213	gss_release_buffer(&gss_status, &gss_send_token);
214	gss_delete_sec_context(&gss_status, &gss_context, NULL);
215	return CURLE_COULDNT_CONNECT;
216	}
217
218	nwritten = Curl_conn_cf_send(cf->next, data,
219	(char *)gss_send_token.value,
220	gss_send_token.length, FALSE, &code);
221	if(code \|\| ((ssize_t)gss_send_token.length != nwritten)) {
222	failf(data, "Failed to send GSS-API authentication token.");
223	gss_release_name(&gss_status, &server);
224	gss_release_buffer(&gss_status, &gss_recv_token);
225	gss_release_buffer(&gss_status, &gss_send_token);
226	gss_delete_sec_context(&gss_status, &gss_context, NULL);
227	return CURLE_COULDNT_CONNECT;
228	}
229
230	}
231
232	gss_release_buffer(&gss_status, &gss_send_token);
233	gss_release_buffer(&gss_status, &gss_recv_token);
234	if(gss_major_status != GSS_S_CONTINUE_NEEDED)
235	break;
236
237	/* analyse response */
238
239	/* GSS-API response looks like
240	* +----+------+-----+----------------+
241	* \|VER \| MTYP \| LEN \| TOKEN \|
242	* +----+------+----------------------+
243	* \| 1 \| 1 \| 2 \| up to 2^16 - 1 \|
244	* +----+------+-----+----------------+
245	*/
246
247	result = Curl_blockread_all(cf, data, (char *)socksreq, 4, &actualread);
248	if(result \|\| (actualread != 4)) {
249	failf(data, "Failed to receive GSS-API authentication response.");
250	gss_release_name(&gss_status, &server);
251	gss_delete_sec_context(&gss_status, &gss_context, NULL);
252	return CURLE_COULDNT_CONNECT;
253	}
254
255	/* ignore the first (VER) byte */
256	if(socksreq[1] == 255) { /* status / message type */
257	failf(data, "User was rejected by the SOCKS5 server (%d %d).",
258	socksreq[0], socksreq[1]);
259	gss_release_name(&gss_status, &server);
260	gss_delete_sec_context(&gss_status, &gss_context, NULL);
261	return CURLE_COULDNT_CONNECT;
262	}
263
264	if(socksreq[1] != 1) { /* status / message type */
265	failf(data, "Invalid GSS-API authentication response type (%d %d).",
266	socksreq[0], socksreq[1]);
267	gss_release_name(&gss_status, &server);
268	gss_delete_sec_context(&gss_status, &gss_context, NULL);
269	return CURLE_COULDNT_CONNECT;
270	}
271
272	memcpy(&us_length, socksreq + 2, sizeof(short));
273	us_length = ntohs(us_length);
274
275	gss_recv_token.length = us_length;
276	gss_recv_token.value = malloc(us_length);
277	if(!gss_recv_token.value) {
278	failf(data,
279	"Could not allocate memory for GSS-API authentication "
280	"response token.");
281	gss_release_name(&gss_status, &server);
282	gss_delete_sec_context(&gss_status, &gss_context, NULL);
283	return CURLE_OUT_OF_MEMORY;
284	}
285
286	result = Curl_blockread_all(cf, data, (char *)gss_recv_token.value,
287	gss_recv_token.length, &actualread);
288
289	if(result \|\| (actualread != us_length)) {
290	failf(data, "Failed to receive GSS-API authentication token.");
291	gss_release_name(&gss_status, &server);
292	gss_release_buffer(&gss_status, &gss_recv_token);
293	gss_delete_sec_context(&gss_status, &gss_context, NULL);
294	return CURLE_COULDNT_CONNECT;
295	}
296
297	gss_token = &gss_recv_token;
298	}
299
300	gss_release_name(&gss_status, &server);
301
302	/* Everything is good so far, user was authenticated! */
303	gss_major_status = gss_inquire_context(&gss_minor_status, gss_context,
304	&gss_client_name, NULL, NULL, NULL,
305	NULL, NULL, NULL);
306	if(check_gss_err(data, gss_major_status,
307	gss_minor_status, "gss_inquire_context")) {
308	gss_delete_sec_context(&gss_status, &gss_context, NULL);
309	gss_release_name(&gss_status, &gss_client_name);
310	failf(data, "Failed to determine username.");
311	return CURLE_COULDNT_CONNECT;
312	}
313	gss_major_status = gss_display_name(&gss_minor_status, gss_client_name,
314	&gss_send_token, NULL);
315	if(check_gss_err(data, gss_major_status,
316	gss_minor_status, "gss_display_name")) {
317	gss_delete_sec_context(&gss_status, &gss_context, NULL);
318	gss_release_name(&gss_status, &gss_client_name);
319	gss_release_buffer(&gss_status, &gss_send_token);
320	failf(data, "Failed to determine username.");
321	return CURLE_COULDNT_CONNECT;
322	}
323	user = malloc(gss_send_token.length + 1);
324	if(!user) {
325	gss_delete_sec_context(&gss_status, &gss_context, NULL);
326	gss_release_name(&gss_status, &gss_client_name);
327	gss_release_buffer(&gss_status, &gss_send_token);
328	return CURLE_OUT_OF_MEMORY;
329	}
330
331	memcpy(user, gss_send_token.value, gss_send_token.length);
332	user[gss_send_token.length] = '\0';
333	gss_release_name(&gss_status, &gss_client_name);
334	gss_release_buffer(&gss_status, &gss_send_token);
335	infof(data, "SOCKS5 server authenticated user %s with GSS-API.",user);
336	free(user);
337	user = NULL;
338
339	/* Do encryption */
340	socksreq[0] = 1; /* GSS-API subnegotiation version */
341	socksreq[1] = 2; /* encryption message type */
342
343	gss_enc = 0; /* no data protection */
344	/* do confidentiality protection if supported */
345	if(gss_ret_flags & GSS_C_CONF_FLAG)
346	gss_enc = 2;
347	/* else do integrity protection */
348	else if(gss_ret_flags & GSS_C_INTEG_FLAG)
349	gss_enc = 1;
350
351	infof(data, "SOCKS5 server supports GSS-API %s data protection.",
352	(gss_enc == 0) ? "no" :
353	((gss_enc == 1) ? "integrity" : "confidentiality"));
354	/* force for the moment to no data protection */
355	gss_enc = 0;
356	/*
357	* Sending the encryption type in clear seems wrong. It should be
358	* protected with gss_seal()/gss_wrap(). See RFC1961 extract below
359	* The NEC reference implementations on which this is based is
360	* therefore at fault
361	*
362	* +------+------+------+.......................+
363	* + ver \| mtyp \| len \| token \|
364	* +------+------+------+.......................+
365	* + 0x01 \| 0x02 \| 0x02 \| up to 2^16 - 1 octets \|
366	* +------+------+------+.......................+
367	*
368	* Where:
369	*
370	* - "ver" is the protocol version number, here 1 to represent the
371	* first version of the SOCKS/GSS-API protocol
372	*
373	* - "mtyp" is the message type, here 2 to represent a protection
374	* -level negotiation message
375	*
376	* - "len" is the length of the "token" field in octets
377	*
378	* - "token" is the GSS-API encapsulated protection level
379	*
380	* The token is produced by encapsulating an octet containing the
381	* required protection level using gss_seal()/gss_wrap() with conf_req
382	* set to FALSE. The token is verified using gss_unseal()/
383	* gss_unwrap().
384	*
385	*/
386	if(data->set.socks5_gssapi_nec) {
387	us_length = htons((short)1);
388	memcpy(socksreq + 2, &us_length, sizeof(short));
389	}
390	else {
391	gss_send_token.length = 1;
392	gss_send_token.value = Curl_memdup(&gss_enc, 1);
393	if(!gss_send_token.value) {
394	gss_delete_sec_context(&gss_status, &gss_context, NULL);
395	return CURLE_OUT_OF_MEMORY;
396	}
397
398	gss_major_status = gss_wrap(&gss_minor_status, gss_context, 0,
399	GSS_C_QOP_DEFAULT, &gss_send_token,
400	&gss_conf_state, &gss_w_token);
401
402	if(check_gss_err(data, gss_major_status, gss_minor_status, "gss_wrap")) {
403	gss_release_buffer(&gss_status, &gss_send_token);
404	gss_release_buffer(&gss_status, &gss_w_token);
405	gss_delete_sec_context(&gss_status, &gss_context, NULL);
406	failf(data, "Failed to wrap GSS-API encryption value into token.");
407	return CURLE_COULDNT_CONNECT;
408	}
409	gss_release_buffer(&gss_status, &gss_send_token);
410
411	us_length = htons((unsigned short)gss_w_token.length);
412	memcpy(socksreq + 2, &us_length, sizeof(short));
413	}
414
415	nwritten = Curl_conn_cf_send(cf->next, data, (char *)socksreq, 4, FALSE,
416	&code);
417	if(code \|\| (4 != nwritten)) {
418	failf(data, "Failed to send GSS-API encryption request.");
419	gss_release_buffer(&gss_status, &gss_w_token);
420	gss_delete_sec_context(&gss_status, &gss_context, NULL);
421	return CURLE_COULDNT_CONNECT;
422	}
423
424	if(data->set.socks5_gssapi_nec) {
425	memcpy(socksreq, &gss_enc, 1);
426	nwritten = Curl_conn_cf_send(cf->next, data, (char *)socksreq, 1, FALSE,
427	&code);
428	if(code \|\| ( 1 != nwritten)) {
429	failf(data, "Failed to send GSS-API encryption type.");
430	gss_delete_sec_context(&gss_status, &gss_context, NULL);
431	return CURLE_COULDNT_CONNECT;
432	}
433	}
434	else {
435	nwritten = Curl_conn_cf_send(cf->next, data,
436	(char *)gss_w_token.value,
437	gss_w_token.length, FALSE, &code);
438	if(code \|\| ((ssize_t)gss_w_token.length != nwritten)) {
439	failf(data, "Failed to send GSS-API encryption type.");
440	gss_release_buffer(&gss_status, &gss_w_token);
441	gss_delete_sec_context(&gss_status, &gss_context, NULL);
442	return CURLE_COULDNT_CONNECT;
443	}
444	gss_release_buffer(&gss_status, &gss_w_token);
445	}
446
447	result = Curl_blockread_all(cf, data, (char *)socksreq, 4, &actualread);
448	if(result \|\| (actualread != 4)) {
449	failf(data, "Failed to receive GSS-API encryption response.");
450	gss_delete_sec_context(&gss_status, &gss_context, NULL);
451	return CURLE_COULDNT_CONNECT;
452	}
453
454	/* ignore the first (VER) byte */
455	if(socksreq[1] == 255) { /* status / message type */
456	failf(data, "User was rejected by the SOCKS5 server (%d %d).",
457	socksreq[0], socksreq[1]);
458	gss_delete_sec_context(&gss_status, &gss_context, NULL);
459	return CURLE_COULDNT_CONNECT;
460	}
461
462	if(socksreq[1] != 2) { /* status / message type */
463	failf(data, "Invalid GSS-API encryption response type (%d %d).",
464	socksreq[0], socksreq[1]);
465	gss_delete_sec_context(&gss_status, &gss_context, NULL);
466	return CURLE_COULDNT_CONNECT;
467	}
468
469	memcpy(&us_length, socksreq + 2, sizeof(short));
470	us_length = ntohs(us_length);
471
472	gss_recv_token.length = us_length;
473	gss_recv_token.value = malloc(gss_recv_token.length);
474	if(!gss_recv_token.value) {
475	gss_delete_sec_context(&gss_status, &gss_context, NULL);
476	return CURLE_OUT_OF_MEMORY;
477	}
478	result = Curl_blockread_all(cf, data, (char *)gss_recv_token.value,
479	gss_recv_token.length, &actualread);
480
481	if(result \|\| (actualread != us_length)) {
482	failf(data, "Failed to receive GSS-API encryption type.");
483	gss_release_buffer(&gss_status, &gss_recv_token);
484	gss_delete_sec_context(&gss_status, &gss_context, NULL);
485	return CURLE_COULDNT_CONNECT;
486	}
487
488	if(!data->set.socks5_gssapi_nec) {
489	gss_major_status = gss_unwrap(&gss_minor_status, gss_context,
490	&gss_recv_token, &gss_w_token,
491	0, GSS_C_QOP_DEFAULT);
492
493	if(check_gss_err(data, gss_major_status, gss_minor_status, "gss_unwrap")) {
494	gss_release_buffer(&gss_status, &gss_recv_token);
495	gss_release_buffer(&gss_status, &gss_w_token);
496	gss_delete_sec_context(&gss_status, &gss_context, NULL);
497	failf(data, "Failed to unwrap GSS-API encryption value into token.");
498	return CURLE_COULDNT_CONNECT;
499	}
500	gss_release_buffer(&gss_status, &gss_recv_token);
501
502	if(gss_w_token.length != 1) {
503	failf(data, "Invalid GSS-API encryption response length (%zu).",
504	gss_w_token.length);
505	gss_release_buffer(&gss_status, &gss_w_token);
506	gss_delete_sec_context(&gss_status, &gss_context, NULL);
507	return CURLE_COULDNT_CONNECT;
508	}
509
510	memcpy(socksreq, gss_w_token.value, gss_w_token.length);
511	gss_release_buffer(&gss_status, &gss_w_token);
512	}
513	else {
514	if(gss_recv_token.length != 1) {
515	failf(data, "Invalid GSS-API encryption response length (%zu).",
516	gss_recv_token.length);
517	gss_release_buffer(&gss_status, &gss_recv_token);
518	gss_delete_sec_context(&gss_status, &gss_context, NULL);
519	return CURLE_COULDNT_CONNECT;
520	}
521
522	memcpy(socksreq, gss_recv_token.value, gss_recv_token.length);
523	gss_release_buffer(&gss_status, &gss_recv_token);
524	}
525
526	(void)curlx_nonblock(sock, TRUE);
527
528	infof(data, "SOCKS5 access with%s protection granted.",
529	(socksreq[0] == 0) ? "out GSS-API data":
530	((socksreq[0] == 1) ? " GSS-API integrity" :
531	" GSS-API confidentiality"));
532
533	conn->socks5_gssapi_enctype = socksreq[0];
534	if(socksreq[0] == 0)
535	gss_delete_sec_context(&gss_status, &gss_context, NULL);
536
537	return CURLE_OK;
538	}
539
540	#endif /* HAVE_GSSAPI && !CURL_DISABLE_PROXY */

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source: vbox/trunk/src/libs/curl-8.11.1/lib/socks_gssapi.c@ 108333

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