1
/***************************************************************************
3
* Project ___| | | | _ \| |
5
* | (__| |_| | _ <| |___
6
* \___|\___/|_| \_\_____|
8
* Copyright (C) 2009, Markus Moeller, <markus_moeller@compuserve.com>
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
* $Id: socks_gssapi.c,v 1.2 2009-01-30 19:29:25 danf Exp $
22
***************************************************************************/
26
#ifndef CURL_DISABLE_PROXY
29
#ifdef HAVE_OLD_GSSMIT
30
#define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name
32
#ifndef gss_nt_service_name
33
#define gss_nt_service_name GSS_C_NT_HOSTBASED_SERVICE
50
static gss_ctx_id_t gss_context = GSS_C_NO_CONTEXT;
52
#define _MPRINTF_REPLACE /* use our functions only */
53
#include <curl/mprintf.h>
55
/* The last #include file should be: */
59
* Helper gssapi error functions.
61
static int check_gss_err(struct SessionHandle *data,
62
OM_uint32 major_status,
63
OM_uint32 minor_status,
66
if(GSS_ERROR(major_status)) {
67
OM_uint32 maj_stat,min_stat;
68
OM_uint32 msg_ctx = 0;
69
gss_buffer_desc status_string;
76
/* convert major status code (GSS-API error) to text */
77
maj_stat = gss_display_status(&min_stat, major_status,
80
&msg_ctx, &status_string);
81
if(maj_stat == GSS_S_COMPLETE) {
82
if(sizeof(buf) > len + status_string.length + 1) {
83
strcpy(buf+len, (char*) status_string.value);
84
len += status_string.length;
86
gss_release_buffer(&min_stat, &status_string);
89
gss_release_buffer(&min_stat, &status_string);
91
if(sizeof(buf) > len + 3) {
92
strcpy(buf+len, ".\n");
97
/* convert minor status code (underlying routine error) to text */
98
maj_stat = gss_display_status(&min_stat, minor_status,
101
&msg_ctx, &status_string);
102
if(maj_stat == GSS_S_COMPLETE) {
103
if(sizeof(buf) > len + status_string.length) {
104
strcpy(buf+len, (char*) status_string.value);
105
len += status_string.length;
107
gss_release_buffer(&min_stat, &status_string);
110
gss_release_buffer(&min_stat, &status_string);
112
failf(data, "GSSAPI error: %s failed:\n%s\n", function, buf);
119
CURLcode Curl_SOCKS5_gssapi_negotiate(int sockindex,
120
struct connectdata *conn)
122
struct SessionHandle *data = conn->data;
123
curl_socket_t sock = conn->sock[sockindex];
129
OM_uint32 gss_major_status, gss_minor_status, gss_status;
130
OM_uint32 gss_ret_flags;
131
int gss_conf_state, gss_enc;
132
gss_buffer_desc service = GSS_C_EMPTY_BUFFER;
133
gss_buffer_desc gss_send_token = GSS_C_EMPTY_BUFFER;
134
gss_buffer_desc gss_recv_token = GSS_C_EMPTY_BUFFER;
135
gss_buffer_desc gss_w_token = GSS_C_EMPTY_BUFFER;
136
gss_buffer_desc* gss_token = GSS_C_NO_BUFFER;
137
gss_name_t server = GSS_C_NO_NAME;
138
gss_name_t gss_client_name = GSS_C_NO_NAME;
141
unsigned char socksreq[4]; /* room for gssapi exchange header only */
142
char *serviceptr = data->set.str[STRING_SOCKS5_GSSAPI_SERVICE];
145
timeout = Curl_timeleft(conn, NULL, TRUE);
147
/* GSSAPI request looks like
148
* +----+------+-----+----------------+
149
* |VER | MTYP | LEN | TOKEN |
150
* +----+------+----------------------+
151
* | 1 | 1 | 2 | up to 2^16 - 1 |
152
* +----+------+-----+----------------+
155
/* prepare service name */
156
if (strchr(serviceptr,'/')) {
157
service.value = malloc(strlen(serviceptr));
159
return CURLE_OUT_OF_MEMORY;
160
service.length = strlen(serviceptr);
161
memcpy(service.value, serviceptr, service.length);
163
gss_major_status = gss_import_name(&gss_minor_status, &service,
164
(gss_OID) GSS_C_NULL_OID, &server);
167
service.value = malloc(strlen(serviceptr) +strlen(conn->proxy.name)+2);
169
return CURLE_OUT_OF_MEMORY;
170
service.length = strlen(serviceptr) +strlen(conn->proxy.name)+1;
171
snprintf(service.value, service.length+1, "%s@%s",
172
serviceptr, conn->proxy.name);
174
gss_major_status = gss_import_name(&gss_minor_status, &service,
175
gss_nt_service_name, &server);
178
gss_release_buffer(&gss_status, &service); /* clear allocated memory */
180
if(check_gss_err(data,gss_major_status,
181
gss_minor_status,"gss_import_name()")) {
182
failf(data, "Failed to create service name.");
183
gss_release_name(&gss_status, &server);
184
return CURLE_COULDNT_CONNECT;
187
/* As long as we need to keep sending some context info, and there's no */
188
/* errors, keep sending it... */
190
gss_major_status = gss_init_sec_context(&gss_minor_status,
192
&gss_context, server,
204
if(gss_token != GSS_C_NO_BUFFER)
205
gss_release_buffer(&gss_status, &gss_recv_token);
206
if(check_gss_err(data,gss_major_status,
207
gss_minor_status,"gss_init_sec_context")) {
208
gss_release_name(&gss_status, &server);
209
gss_release_buffer(&gss_status, &gss_recv_token);
210
gss_release_buffer(&gss_status, &gss_send_token);
211
gss_delete_sec_context(&gss_status, &gss_context, NULL);
212
failf(data, "Failed to initial GSSAPI token.");
213
return CURLE_COULDNT_CONNECT;
216
if(gss_send_token.length != 0) {
217
socksreq[0] = 1; /* gssapi subnegotiation version */
218
socksreq[1] = 1; /* authentication message type */
219
us_length = htons((short)gss_send_token.length);
220
memcpy(socksreq+2,&us_length,sizeof(short));
222
code = Curl_write_plain(conn, sock, (char *)socksreq, 4, &written);
223
if((code != CURLE_OK) || (4 != written)) {
224
failf(data, "Failed to send GSSAPI authentication request.");
225
gss_release_name(&gss_status, &server);
226
gss_release_buffer(&gss_status, &gss_recv_token);
227
gss_release_buffer(&gss_status, &gss_send_token);
228
gss_delete_sec_context(&gss_status, &gss_context, NULL);
229
return CURLE_COULDNT_CONNECT;
232
code = Curl_write_plain(conn, sock, (char *)gss_send_token.value,
233
gss_send_token.length, &written);
235
if((code != CURLE_OK) || ((ssize_t)gss_send_token.length != written)) {
236
failf(data, "Failed to send GSSAPI authentication token.");
237
gss_release_name(&gss_status, &server);
238
gss_release_buffer(&gss_status, &gss_recv_token);
239
gss_release_buffer(&gss_status, &gss_send_token);
240
gss_delete_sec_context(&gss_status, &gss_context, NULL);
241
return CURLE_COULDNT_CONNECT;
246
gss_release_buffer(&gss_status, &gss_send_token);
247
gss_release_buffer(&gss_status, &gss_recv_token);
248
if(gss_major_status != GSS_S_CONTINUE_NEEDED) break;
250
/* analyse response */
252
/* GSSAPI response looks like
253
* +----+------+-----+----------------+
254
* |VER | MTYP | LEN | TOKEN |
255
* +----+------+----------------------+
256
* | 1 | 1 | 2 | up to 2^16 - 1 |
257
* +----+------+-----+----------------+
260
result=Curl_blockread_all(conn, sock, (char *)socksreq, 4,
261
&actualread, timeout);
262
if(result != CURLE_OK || actualread != 4) {
263
failf(data, "Failed to receive GSSAPI authentication response.");
264
gss_release_name(&gss_status, &server);
265
gss_delete_sec_context(&gss_status, &gss_context, NULL);
266
return CURLE_COULDNT_CONNECT;
269
/* ignore the first (VER) byte */
270
if(socksreq[1] == 255) { /* status / message type */
271
failf(data, "User was rejected by the SOCKS5 server (%d %d).",
272
socksreq[0], socksreq[1]);
273
gss_release_name(&gss_status, &server);
274
gss_delete_sec_context(&gss_status, &gss_context, NULL);
275
return CURLE_COULDNT_CONNECT;
278
if(socksreq[1] != 1) { /* status / messgae type */
279
failf(data, "Invalid GSSAPI authentication response type (%d %d).",
280
socksreq[0], socksreq[1]);
281
gss_release_name(&gss_status, &server);
282
gss_delete_sec_context(&gss_status, &gss_context, NULL);
283
return CURLE_COULDNT_CONNECT;
286
memcpy(&us_length, socksreq+2, sizeof(short));
287
us_length = ntohs(us_length);
289
gss_recv_token.length=us_length;
290
gss_recv_token.value=malloc(us_length);
291
if(!gss_recv_token.value) {
293
"Could not allocate memory for GSSAPI authentication "
295
gss_release_name(&gss_status, &server);
296
gss_delete_sec_context(&gss_status, &gss_context, NULL);
297
return CURLE_OUT_OF_MEMORY;
300
result=Curl_blockread_all(conn, sock, (char *)gss_recv_token.value,
301
gss_recv_token.length,
302
&actualread, timeout);
304
if(result != CURLE_OK || actualread != us_length) {
305
failf(data, "Failed to receive GSSAPI authentication token.");
306
gss_release_name(&gss_status, &server);
307
gss_release_buffer(&gss_status, &gss_recv_token);
308
gss_delete_sec_context(&gss_status, &gss_context, NULL);
309
return CURLE_COULDNT_CONNECT;
312
gss_token = &gss_recv_token;
315
gss_release_name(&gss_status, &server);
317
/* Everything is good so far, user was authenticated! */
318
gss_major_status = gss_inquire_context (&gss_minor_status, gss_context,
319
&gss_client_name, NULL, NULL, NULL,
321
if(check_gss_err(data,gss_major_status,
322
gss_minor_status,"gss_inquire_context")) {
323
gss_delete_sec_context(&gss_status, &gss_context, NULL);
324
gss_release_name(&gss_status, &gss_client_name);
325
failf(data, "Failed to determine user name.");
326
return CURLE_COULDNT_CONNECT;
328
gss_major_status = gss_display_name(&gss_minor_status, gss_client_name,
329
&gss_send_token, NULL);
330
if(check_gss_err(data,gss_major_status,
331
gss_minor_status,"gss_display_name")) {
332
gss_delete_sec_context(&gss_status, &gss_context, NULL);
333
gss_release_name(&gss_status, &gss_client_name);
334
gss_release_buffer(&gss_status, &gss_send_token);
335
failf(data, "Failed to determine user name.");
336
return CURLE_COULDNT_CONNECT;
338
user=malloc(gss_send_token.length+1);
340
gss_delete_sec_context(&gss_status, &gss_context, NULL);
341
gss_release_name(&gss_status, &gss_client_name);
342
gss_release_buffer(&gss_status, &gss_send_token);
343
return CURLE_OUT_OF_MEMORY;
346
memcpy(user, gss_send_token.value, gss_send_token.length);
347
user[gss_send_token.length] = '\0';
348
gss_release_name(&gss_status, &gss_client_name);
349
gss_release_buffer(&gss_status, &gss_send_token);
350
infof(data, "SOCKS5 server authencticated user %s with gssapi.\n",user);
355
socksreq[0] = 1; /* gssapi subnegotiation version */
356
socksreq[1] = 2; /* encryption message type */
358
gss_enc = 0; /* no data protection */
359
/* do confidentiality protection if supported */
360
if(gss_ret_flags & GSS_C_CONF_FLAG)
362
/* else do integrity protection */
363
else if(gss_ret_flags & GSS_C_INTEG_FLAG)
366
infof(data, "SOCKS5 server supports gssapi %s data protection.\n",
367
(gss_enc==0)?"no":((gss_enc==1)?"integrity":"confidentiality"));
368
/* force for the moment to no data protection */
371
* Sending the encryption type in clear seems wrong. It should be
372
* protected with gss_seal()/gss_wrap(). See RFC1961 extract below
373
* The NEC reference implementations on which this is based is
376
* +------+------+------+.......................+
377
* + ver | mtyp | len | token |
378
* +------+------+------+.......................+
379
* + 0x01 | 0x02 | 0x02 | up to 2^16 - 1 octets |
380
* +------+------+------+.......................+
384
* - "ver" is the protocol version number, here 1 to represent the
385
* first version of the SOCKS/GSS-API protocol
387
* - "mtyp" is the message type, here 2 to represent a protection
388
* -level negotiation message
390
* - "len" is the length of the "token" field in octets
392
* - "token" is the GSS-API encapsulated protection level
394
* The token is produced by encapsulating an octet containing the
395
* required protection level using gss_seal()/gss_wrap() with conf_req
396
* set to FALSE. The token is verified using gss_unseal()/
400
if(data->set.socks5_gssapi_nec) {
401
us_length = htons((short)1);
402
memcpy(socksreq+2,&us_length,sizeof(short));
405
gss_send_token.length = 1;
406
gss_send_token.value = malloc(1);
407
if(!gss_send_token.value) {
408
gss_delete_sec_context(&gss_status, &gss_context, NULL);
409
return CURLE_OUT_OF_MEMORY;
411
memcpy(gss_send_token.value, &gss_enc, 1);
413
gss_major_status = gss_wrap(&gss_minor_status, gss_context, 0,
414
GSS_C_QOP_DEFAULT, &gss_send_token,
415
&gss_conf_state, &gss_w_token);
417
if(check_gss_err(data,gss_major_status,gss_minor_status,"gss_wrap")) {
418
gss_release_buffer(&gss_status, &gss_send_token);
419
gss_release_buffer(&gss_status, &gss_w_token);
420
gss_delete_sec_context(&gss_status, &gss_context, NULL);
421
failf(data, "Failed to wrap GSSAPI encryption value into token.");
422
return CURLE_COULDNT_CONNECT;
424
gss_release_buffer(&gss_status, &gss_send_token);
426
us_length = htons((short)gss_w_token.length);
427
memcpy(socksreq+2,&us_length,sizeof(short));
430
code = Curl_write_plain(conn, sock, (char *)socksreq, 4, &written);
431
if((code != CURLE_OK) || (4 != written)) {
432
failf(data, "Failed to send GSSAPI encryption request.");
433
gss_release_buffer(&gss_status, &gss_w_token);
434
gss_delete_sec_context(&gss_status, &gss_context, NULL);
435
return CURLE_COULDNT_CONNECT;
438
if(data->set.socks5_gssapi_nec) {
439
memcpy(socksreq, &gss_enc, 1);
440
code = Curl_write_plain(conn, sock, socksreq, 1, &written);
441
if((code != CURLE_OK) || ( 1 != written)) {
442
failf(data, "Failed to send GSSAPI encryption type.");
443
gss_delete_sec_context(&gss_status, &gss_context, NULL);
444
return CURLE_COULDNT_CONNECT;
447
code = Curl_write_plain(conn, sock, (char *)gss_w_token.value,
448
gss_w_token.length, &written);
449
if((code != CURLE_OK) || ((ssize_t)gss_w_token.length != written)) {
450
failf(data, "Failed to send GSSAPI encryption type.");
451
gss_release_buffer(&gss_status, &gss_w_token);
452
gss_delete_sec_context(&gss_status, &gss_context, NULL);
453
return CURLE_COULDNT_CONNECT;
455
gss_release_buffer(&gss_status, &gss_w_token);
458
result=Curl_blockread_all(conn, sock, (char *)socksreq, 4,
459
&actualread, timeout);
460
if(result != CURLE_OK || actualread != 4) {
461
failf(data, "Failed to receive GSSAPI encryption response.");
462
gss_delete_sec_context(&gss_status, &gss_context, NULL);
463
return CURLE_COULDNT_CONNECT;
466
/* ignore the first (VER) byte */
467
if(socksreq[1] == 255) { /* status / message type */
468
failf(data, "User was rejected by the SOCKS5 server (%d %d).",
469
socksreq[0], socksreq[1]);
470
gss_delete_sec_context(&gss_status, &gss_context, NULL);
471
return CURLE_COULDNT_CONNECT;
474
if(socksreq[1] != 2) { /* status / messgae type */
475
failf(data, "Invalid GSSAPI encryption response type (%d %d).",
476
socksreq[0], socksreq[1]);
477
gss_delete_sec_context(&gss_status, &gss_context, NULL);
478
return CURLE_COULDNT_CONNECT;
481
memcpy(&us_length, socksreq+2, sizeof(short));
482
us_length = ntohs(us_length);
484
gss_recv_token.length= us_length;
485
gss_recv_token.value=malloc(gss_recv_token.length);
486
if(!gss_recv_token.value) {
487
gss_delete_sec_context(&gss_status, &gss_context, NULL);
488
return CURLE_OUT_OF_MEMORY;
490
result=Curl_blockread_all(conn, sock, (char *)gss_recv_token.value,
491
gss_recv_token.length,
492
&actualread, timeout);
494
if(result != CURLE_OK || actualread != us_length) {
495
failf(data, "Failed to receive GSSAPI encryptrion type.");
496
gss_release_buffer(&gss_status, &gss_recv_token);
497
gss_delete_sec_context(&gss_status, &gss_context, NULL);
498
return CURLE_COULDNT_CONNECT;
501
if(!data->set.socks5_gssapi_nec) {
502
gss_major_status = gss_unwrap(&gss_minor_status, gss_context,
503
&gss_recv_token, &gss_w_token,
504
0, GSS_C_QOP_DEFAULT);
506
if(check_gss_err(data,gss_major_status,gss_minor_status,"gss_unwrap")) {
507
gss_release_buffer(&gss_status, &gss_recv_token);
508
gss_release_buffer(&gss_status, &gss_w_token);
509
gss_delete_sec_context(&gss_status, &gss_context, NULL);
510
failf(data, "Failed to unwrap GSSAPI encryption value into token.");
511
return CURLE_COULDNT_CONNECT;
513
gss_release_buffer(&gss_status, &gss_recv_token);
515
if(gss_w_token.length != 1) {
516
failf(data, "Invalid GSSAPI encryption response length (%d).",
518
gss_release_buffer(&gss_status, &gss_w_token);
519
gss_delete_sec_context(&gss_status, &gss_context, NULL);
520
return CURLE_COULDNT_CONNECT;
523
memcpy(socksreq,gss_w_token.value,gss_w_token.length);
524
gss_release_buffer(&gss_status, &gss_w_token);
527
if(gss_recv_token.length != 1) {
528
failf(data, "Invalid GSSAPI encryption response length (%d).",
529
gss_recv_token.length);
530
gss_release_buffer(&gss_status, &gss_recv_token);
531
gss_delete_sec_context(&gss_status, &gss_context, NULL);
532
return CURLE_COULDNT_CONNECT;
535
memcpy(socksreq,gss_recv_token.value,gss_recv_token.length);
536
gss_release_buffer(&gss_status, &gss_recv_token);
539
infof(data, "SOCKS5 access with%s protection granted.\n",
540
(socksreq[0]==0)?"out gssapi data":
541
((socksreq[0]==1)?" gssapi integrity":" gssapi confidentiality"));
543
conn->socks5_gssapi_enctype = socksreq[0];
545
gss_delete_sec_context(&gss_status, &gss_context, NULL);
551
#endif /* CURL_DISABLE_PROXY */